zend_compile.c

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/*
   +----------------------------------------------------------------------+
   | Zend Engine                                                          |
   +----------------------------------------------------------------------+
   | Copyright (c) Zend Technologies Ltd. (http://www.zend.com)           |
   +----------------------------------------------------------------------+
   | This source file is subject to version 2.00 of the Zend license,     |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | http://www.zend.com/license/2_00.txt.                                |
   | If you did not receive a copy of the Zend license and are unable to  |
   | obtain it through the world-wide-web, please send a note to          |
   | license@zend.com so we can mail you a copy immediately.              |
   +----------------------------------------------------------------------+
   | Authors: Andi Gutmans <andi@php.net>                                 |
   |          Zeev Suraski <zeev@php.net>                                 |
   |          Nikita Popov <nikic@php.net>                                |
   +----------------------------------------------------------------------+
*/
 
#include <zend_language_parser.h>
#include "zend.h"
#include "zend_ast.h"
#include "zend_attributes.h"
#include "zend_compile.h"
#include "zend_constants.h"
#include "zend_llist.h"
#include "zend_API.h"
#include "zend_exceptions.h"
#include "zend_interfaces.h"
#include "zend_virtual_cwd.h"
#include "zend_multibyte.h"
#include "zend_language_scanner.h"
#include "zend_inheritance.h"
#include "zend_vm.h"
#include "zend_enum.h"
#include "zend_observer.h"
#include "zend_call_stack.h"
#include "zend_frameless_function.h"
#include "zend_property_hooks.h"
 
#define SET_NODE(target, src) do { \
        target ## _type = (src)->op_type; \
        if ((src)->op_type == IS_CONST) { \
            target.constant = zend_add_literal(&(src)->u.constant); \
        } else { \
            target = (src)->u.op; \
        } \
    } while (0)
 
#define GET_NODE(target, src) do { \
        (target)->op_type = src ## _type; \
        if ((target)->op_type == IS_CONST) { \
            ZVAL_COPY_VALUE(&(target)->u.constant, CT_CONSTANT(src)); \
        } else { \
            (target)->u.op = src; \
        } \
    } while (0)
 
#define FC(member) (CG(file_context).member)
 
typedef struct _zend_loop_var {
    uint8_t opcode;
    uint8_t var_type;
    uint32_t   var_num;
    uint32_t   try_catch_offset;
} zend_loop_var;
 
static inline uint32_t zend_alloc_cache_slots(unsigned count) {
    if (count == 0) {
        /* Even if no cache slots are desired, the VM handler may still want to acquire
         * CACHE_ADDR() unconditionally. Returning zero makes sure that the address
         * calculation is still legal and ubsan does not complain. */
        return 0;
    }
 
    zend_op_array *op_array = CG(active_op_array);
    uint32_t ret = op_array->cache_size;
    op_array->cache_size += count * sizeof(void*);
    return ret;
}
 
static inline uint32_t zend_alloc_cache_slot(void) {
    return zend_alloc_cache_slots(1);
}
 
ZEND_API zend_op_array *(*zend_compile_file)(zend_file_handle *file_handle, int type);
ZEND_API zend_op_array *(*zend_compile_string)(zend_string *source_string, const char *filename, zend_compile_position position);
 
#ifndef ZTS
ZEND_API zend_compiler_globals compiler_globals;
ZEND_API zend_executor_globals executor_globals;
#endif
 
static zend_op *zend_emit_op(znode *result, uint8_t opcode, znode *op1, znode *op2);
static bool zend_try_ct_eval_array(zval *result, zend_ast *ast);
static void zend_eval_const_expr(zend_ast **ast_ptr);
 
static zend_op *zend_compile_var(znode *result, zend_ast *ast, uint32_t type, bool by_ref);
static zend_op *zend_delayed_compile_var(znode *result, zend_ast *ast, uint32_t type, bool by_ref);
static void zend_compile_expr(znode *result, zend_ast *ast);
static void zend_compile_stmt(zend_ast *ast);
static void zend_compile_assign(znode *result, zend_ast *ast);
 
#ifdef ZEND_CHECK_STACK_LIMIT
zend_never_inline static void zend_stack_limit_error(void)
{
    size_t max_stack_size = 0;
    if ((uintptr_t) EG(stack_base) > (uintptr_t) EG(stack_limit)) {
        max_stack_size = (size_t) ((uintptr_t) EG(stack_base) - (uintptr_t) EG(stack_limit));
    }
 
    zend_error_noreturn(E_COMPILE_ERROR,
        "Maximum call stack size of %zu bytes (zend.max_allowed_stack_size - zend.reserved_stack_size) reached during compilation. Try splitting expression",
        max_stack_size);
}
 
static void zend_check_stack_limit(void)
{
    if (UNEXPECTED(zend_call_stack_overflowed(EG(stack_limit)))) {
        zend_stack_limit_error();
    }
}
#else /* ZEND_CHECK_STACK_LIMIT */
static void zend_check_stack_limit(void)
{
}
#endif /* ZEND_CHECK_STACK_LIMIT */
 
static void init_op(zend_op *op)
{
    MAKE_NOP(op);
    op->extended_value = 0;
    op->lineno = CG(zend_lineno);
#ifdef ZEND_VERIFY_TYPE_INFERENCE
    op->op1_use_type = 0;
    op->op2_use_type = 0;
    op->result_use_type = 0;
    op->op1_def_type = 0;
    op->op2_def_type = 0;
    op->result_def_type = 0;
#endif
}
 
static zend_always_inline uint32_t get_next_op_number(void)
{
    return CG(active_op_array)->last;
}
 
static zend_op *get_next_op(void)
{
    zend_op_array *op_array = CG(active_op_array);
    uint32_t next_op_num = op_array->last++;
    zend_op *next_op;
 
    if (UNEXPECTED(next_op_num >= CG(context).opcodes_size)) {
        CG(context).opcodes_size *= 4;
        op_array->opcodes = erealloc(op_array->opcodes, CG(context).opcodes_size * sizeof(zend_op));
    }
 
    next_op = &(op_array->opcodes[next_op_num]);
 
    init_op(next_op);
 
    return next_op;
}
 
static zend_brk_cont_element *get_next_brk_cont_element(void)
{
    CG(context).last_brk_cont++;
    CG(context).brk_cont_array = erealloc(CG(context).brk_cont_array, sizeof(zend_brk_cont_element) * CG(context).last_brk_cont);
    return &CG(context).brk_cont_array[CG(context).last_brk_cont-1];
}
 
static zend_string *zend_build_runtime_definition_key(zend_string *name, uint32_t start_lineno) /* {{{ */
{
    zend_string *filename = CG(active_op_array)->filename;
    zend_string *result = zend_strpprintf(0, "%c%s%s:%" PRIu32 "$%" PRIx32,
        '\0', ZSTR_VAL(name), ZSTR_VAL(filename), start_lineno, CG(rtd_key_counter)++);
    return zend_new_interned_string(result);
}
/* }}} */
 
static bool zend_get_unqualified_name(const zend_string *name, const char **result, size_t *result_len) /* {{{ */
{
    const char *ns_separator = zend_memrchr(ZSTR_VAL(name), '\\', ZSTR_LEN(name));
    if (ns_separator != NULL) {
        *result = ns_separator + 1;
        *result_len = ZSTR_VAL(name) + ZSTR_LEN(name) - *result;
        return 1;
    }
 
    return 0;
}
/* }}} */
 
struct reserved_class_name {
    const char *name;
    size_t len;
};
static const struct reserved_class_name reserved_class_names[] = {
    {ZEND_STRL("bool")},
    {ZEND_STRL("false")},
    {ZEND_STRL("float")},
    {ZEND_STRL("int")},
    {ZEND_STRL("null")},
    {ZEND_STRL("parent")},
    {ZEND_STRL("self")},
    {ZEND_STRL("static")},
    {ZEND_STRL("string")},
    {ZEND_STRL("true")},
    {ZEND_STRL("void")},
    {ZEND_STRL("never")},
    {ZEND_STRL("iterable")},
    {ZEND_STRL("object")},
    {ZEND_STRL("mixed")},
    {NULL, 0}
};
 
static bool zend_is_reserved_class_name(const zend_string *name) /* {{{ */
{
    const struct reserved_class_name *reserved = reserved_class_names;
 
    const char *uqname = ZSTR_VAL(name);
    size_t uqname_len = ZSTR_LEN(name);
    zend_get_unqualified_name(name, &uqname, &uqname_len);
 
    for (; reserved->name; ++reserved) {
        if (uqname_len == reserved->len
            && zend_binary_strcasecmp(uqname, uqname_len, reserved->name, reserved->len) == 0
        ) {
            return 1;
        }
    }
 
    return 0;
}
/* }}} */
 
void zend_assert_valid_class_name(const zend_string *name, const char *type) /* {{{ */
{
    if (zend_is_reserved_class_name(name)) {
        zend_error_noreturn(E_COMPILE_ERROR,
            "Cannot use \"%s\" as %s as it is reserved", ZSTR_VAL(name), type);
    }
    if (zend_string_equals_literal(name, "_")) {
        zend_error(E_DEPRECATED, "Using \"_\" as %s is deprecated since 8.4", type);
    }
}
/* }}} */
 
typedef struct _builtin_type_info {
    const char* name;
    const size_t name_len;
    const uint8_t type;
} builtin_type_info;
 
static const builtin_type_info builtin_types[] = {
    {ZEND_STRL("null"), IS_NULL},
    {ZEND_STRL("true"), IS_TRUE},
    {ZEND_STRL("false"), IS_FALSE},
    {ZEND_STRL("int"), IS_LONG},
    {ZEND_STRL("float"), IS_DOUBLE},
    {ZEND_STRL("string"), IS_STRING},
    {ZEND_STRL("bool"), _IS_BOOL},
    {ZEND_STRL("void"), IS_VOID},
    {ZEND_STRL("never"), IS_NEVER},
    {ZEND_STRL("iterable"), IS_ITERABLE},
    {ZEND_STRL("object"), IS_OBJECT},
    {ZEND_STRL("mixed"), IS_MIXED},
    {NULL, 0, IS_UNDEF}
};
 
typedef struct {
    const char *name;
    size_t name_len;
    const char *correct_name;
} confusable_type_info;
 
static const confusable_type_info confusable_types[] = {
    {ZEND_STRL("boolean"), "bool"},
    {ZEND_STRL("integer"), "int"},
    {ZEND_STRL("double"), "float"},
    {ZEND_STRL("resource"), NULL},
    {NULL, 0, NULL},
};
 
static zend_always_inline uint8_t zend_lookup_builtin_type_by_name(const zend_string *name) /* {{{ */
{
    const builtin_type_info *info = &builtin_types[0];
 
    for (; info->name; ++info) {
        if (ZSTR_LEN(name) == info->name_len
            && zend_binary_strcasecmp(ZSTR_VAL(name), ZSTR_LEN(name), info->name, info->name_len) == 0
        ) {
            return info->type;
        }
    }
 
    return 0;
}
/* }}} */
 
static zend_always_inline bool zend_is_confusable_type(const zend_string *name, const char **correct_name) /* {{{ */
{
    const confusable_type_info *info = confusable_types;
 
    /* Intentionally using case-sensitive comparison here, because "integer" is likely intended
     * as a scalar type, while "Integer" is likely a class type. */
    for (; info->name; ++info) {
        if (zend_string_equals_cstr(name, info->name, info->name_len)) {
            *correct_name = info->correct_name;
            return 1;
        }
    }
 
    return 0;
}
/* }}} */
 
static bool zend_is_not_imported(zend_string *name) {
    /* Assuming "name" is unqualified here. */
    return !FC(imports) || zend_hash_find_ptr_lc(FC(imports), name) == NULL;
}
 
void zend_oparray_context_begin(zend_oparray_context *prev_context, zend_op_array *op_array) /* {{{ */
{
    *prev_context = CG(context);
    CG(context).prev = CG(context).op_array ? prev_context : NULL;
    CG(context).op_array = op_array;
    CG(context).opcodes_size = INITIAL_OP_ARRAY_SIZE;
    CG(context).vars_size = 0;
    CG(context).literals_size = 0;
    CG(context).fast_call_var = -1;
    CG(context).try_catch_offset = -1;
    CG(context).current_brk_cont = -1;
    CG(context).last_brk_cont = 0;
    CG(context).brk_cont_array = NULL;
    CG(context).labels = NULL;
    CG(context).in_jmp_frameless_branch = false;
    CG(context).active_property_info = NULL;
    CG(context).active_property_hook_kind = (zend_property_hook_kind)-1;
}
/* }}} */
 
void zend_oparray_context_end(zend_oparray_context *prev_context) /* {{{ */
{
    if (CG(context).brk_cont_array) {
        efree(CG(context).brk_cont_array);
        CG(context).brk_cont_array = NULL;
    }
    if (CG(context).labels) {
        zend_hash_destroy(CG(context).labels);
        FREE_HASHTABLE(CG(context).labels);
        CG(context).labels = NULL;
    }
    CG(context) = *prev_context;
}
/* }}} */
 
static void zend_reset_import_tables(void) /* {{{ */
{
    if (FC(imports)) {
        zend_hash_destroy(FC(imports));
        efree(FC(imports));
        FC(imports) = NULL;
    }
 
    if (FC(imports_function)) {
        zend_hash_destroy(FC(imports_function));
        efree(FC(imports_function));
        FC(imports_function) = NULL;
    }
 
    if (FC(imports_const)) {
        zend_hash_destroy(FC(imports_const));
        efree(FC(imports_const));
        FC(imports_const) = NULL;
    }
 
    zend_hash_clean(&FC(seen_symbols));
}
/* }}} */
 
static void zend_end_namespace(void) /* {{{ */ {
    FC(in_namespace) = 0;
    zend_reset_import_tables();
    if (FC(current_namespace)) {
        zend_string_release_ex(FC(current_namespace), 0);
        FC(current_namespace) = NULL;
    }
}
/* }}} */
 
void zend_file_context_begin(zend_file_context *prev_context) /* {{{ */
{
    *prev_context = CG(file_context);
    FC(imports) = NULL;
    FC(imports_function) = NULL;
    FC(imports_const) = NULL;
    FC(current_namespace) = NULL;
    FC(in_namespace) = 0;
    FC(has_bracketed_namespaces) = 0;
    FC(declarables).ticks = 0;
    zend_hash_init(&FC(seen_symbols), 8, NULL, NULL, 0);
}
/* }}} */
 
void zend_file_context_end(zend_file_context *prev_context) /* {{{ */
{
    zend_end_namespace();
    zend_hash_destroy(&FC(seen_symbols));
    CG(file_context) = *prev_context;
}
/* }}} */
 
void zend_init_compiler_data_structures(void) /* {{{ */
{
    zend_stack_init(&CG(loop_var_stack), sizeof(zend_loop_var));
    zend_stack_init(&CG(delayed_oplines_stack), sizeof(zend_op));
    zend_stack_init(&CG(short_circuiting_opnums), sizeof(uint32_t));
    CG(active_class_entry) = NULL;
    CG(in_compilation) = 0;
    CG(skip_shebang) = 0;
 
    CG(encoding_declared) = 0;
    CG(memoized_exprs) = NULL;
    CG(memoize_mode) = ZEND_MEMOIZE_NONE;
}
/* }}} */
 
static void zend_register_seen_symbol(zend_string *name, uint32_t kind) {
    zval *zv = zend_hash_find(&FC(seen_symbols), name);
    if (zv) {
        Z_LVAL_P(zv) |= kind;
    } else {
        zval tmp;
        ZVAL_LONG(&tmp, kind);
        zend_hash_add_new(&FC(seen_symbols), name, &tmp);
    }
}
 
static bool zend_have_seen_symbol(zend_string *name, uint32_t kind) {
    zval *zv = zend_hash_find(&FC(seen_symbols), name);
    return zv && (Z_LVAL_P(zv) & kind) != 0;
}
 
void init_compiler(void) /* {{{ */
{
    CG(arena) = zend_arena_create(64 * 1024);
    CG(active_op_array) = NULL;
    memset(&CG(context), 0, sizeof(CG(context)));
    zend_init_compiler_data_structures();
    zend_init_rsrc_list();
    zend_stream_init();
    CG(unclean_shutdown) = 0;
 
    CG(delayed_variance_obligations) = NULL;
    CG(delayed_autoloads) = NULL;
    CG(unlinked_uses) = NULL;
    CG(current_linking_class) = NULL;
}
/* }}} */
 
void shutdown_compiler(void) /* {{{ */
{
    /* Reset filename before destroying the arena, as file cache may use arena allocated strings. */
    zend_restore_compiled_filename(NULL);
 
    zend_stack_destroy(&CG(loop_var_stack));
    zend_stack_destroy(&CG(delayed_oplines_stack));
    zend_stack_destroy(&CG(short_circuiting_opnums));
 
    if (CG(delayed_variance_obligations)) {
        zend_hash_destroy(CG(delayed_variance_obligations));
        FREE_HASHTABLE(CG(delayed_variance_obligations));
        CG(delayed_variance_obligations) = NULL;
    }
    if (CG(delayed_autoloads)) {
        zend_hash_destroy(CG(delayed_autoloads));
        FREE_HASHTABLE(CG(delayed_autoloads));
        CG(delayed_autoloads) = NULL;
    }
    if (CG(unlinked_uses)) {
        zend_hash_destroy(CG(unlinked_uses));
        FREE_HASHTABLE(CG(unlinked_uses));
        CG(unlinked_uses) = NULL;
    }
    CG(current_linking_class) = NULL;
}
/* }}} */
 
ZEND_API zend_string *zend_set_compiled_filename(zend_string *new_compiled_filename) /* {{{ */
{
    CG(compiled_filename) = zend_string_copy(new_compiled_filename);
    return new_compiled_filename;
}
/* }}} */
 
ZEND_API void zend_restore_compiled_filename(zend_string *original_compiled_filename) /* {{{ */
{
    if (CG(compiled_filename)) {
        zend_string_release(CG(compiled_filename));
        CG(compiled_filename) = NULL;
    }
    CG(compiled_filename) = original_compiled_filename;
}
/* }}} */
 
ZEND_API zend_string *zend_get_compiled_filename(void) /* {{{ */
{
    return CG(compiled_filename);
}
/* }}} */
 
ZEND_API int zend_get_compiled_lineno(void) /* {{{ */
{
    return CG(zend_lineno);
}
/* }}} */
 
ZEND_API bool zend_is_compiling(void) /* {{{ */
{
    return CG(in_compilation);
}
/* }}} */
 
static zend_always_inline uint32_t get_temporary_variable(void) /* {{{ */
{
    return (uint32_t)CG(active_op_array)->T++;
}
/* }}} */
 
static int lookup_cv(zend_string *name) /* {{{ */{
    zend_op_array *op_array = CG(active_op_array);
    int i = 0;
    zend_ulong hash_value = zend_string_hash_val(name);
 
    while (i < op_array->last_var) {
        if (ZSTR_H(op_array->vars[i]) == hash_value
         && zend_string_equals(op_array->vars[i], name)) {
            return EX_NUM_TO_VAR(i);
        }
        i++;
    }
    i = op_array->last_var;
    op_array->last_var++;
    if (op_array->last_var > CG(context).vars_size) {
        CG(context).vars_size += 16; /* FIXME */
        op_array->vars = erealloc(op_array->vars, CG(context).vars_size * sizeof(zend_string*));
    }
 
    op_array->vars[i] = zend_string_copy(name);
    return EX_NUM_TO_VAR(i);
}
/* }}} */
 
zend_string *zval_make_interned_string(zval *zv)
{
    ZEND_ASSERT(Z_TYPE_P(zv) == IS_STRING);
    Z_STR_P(zv) = zend_new_interned_string(Z_STR_P(zv));
    if (ZSTR_IS_INTERNED(Z_STR_P(zv))) {
        Z_TYPE_FLAGS_P(zv) = 0;
    }
    return Z_STR_P(zv);
}
 
/* Common part of zend_add_literal and zend_append_individual_literal */
static inline void zend_insert_literal(zend_op_array *op_array, zval *zv, int literal_position) /* {{{ */
{
    zval *lit = CT_CONSTANT_EX(op_array, literal_position);
    if (Z_TYPE_P(zv) == IS_STRING) {
        zval_make_interned_string(zv);
    }
    ZVAL_COPY_VALUE(lit, zv);
    Z_EXTRA_P(lit) = 0;
}
/* }}} */
 
/* Is used while compiling a function, using the context to keep track
   of an approximate size to avoid to relocate to often.
   Literals are truncated to actual size in the second compiler pass (pass_two()). */
static int zend_add_literal(zval *zv) /* {{{ */
{
    zend_op_array *op_array = CG(active_op_array);
    int i = op_array->last_literal;
    op_array->last_literal++;
    if (i >= CG(context).literals_size) {
        while (i >= CG(context).literals_size) {
            CG(context).literals_size += 16; /* FIXME */
        }
        op_array->literals = (zval*)erealloc(op_array->literals, CG(context).literals_size * sizeof(zval));
    }
    zend_insert_literal(op_array, zv, i);
    return i;
}
/* }}} */
 
static inline int zend_add_literal_string(zend_string **str) /* {{{ */
{
    int ret;
    zval zv;
    ZVAL_STR(&zv, *str);
    ret = zend_add_literal(&zv);
    *str = Z_STR(zv);
    return ret;
}
/* }}} */
 
static int zend_add_func_name_literal(zend_string *name) /* {{{ */
{
    /* Original name */
    int ret = zend_add_literal_string(&name);
 
    /* Lowercased name */
    zend_string *lc_name = zend_string_tolower(name);
    zend_add_literal_string(&lc_name);
 
    return ret;
}
/* }}} */
 
static int zend_add_ns_func_name_literal(zend_string *name) /* {{{ */
{
    const char *unqualified_name;
    size_t unqualified_name_len;
 
    /* Original name */
    int ret = zend_add_literal_string(&name);
 
    /* Lowercased name */
    zend_string *lc_name = zend_string_tolower(name);
    zend_add_literal_string(&lc_name);
 
    /* Lowercased unqualified name */
    if (zend_get_unqualified_name(name, &unqualified_name, &unqualified_name_len)) {
        lc_name = zend_string_alloc(unqualified_name_len, 0);
        zend_str_tolower_copy(ZSTR_VAL(lc_name), unqualified_name, unqualified_name_len);
        zend_add_literal_string(&lc_name);
    }
 
    return ret;
}
/* }}} */
 
static int zend_add_class_name_literal(zend_string *name) /* {{{ */
{
    /* Original name */
    int ret = zend_add_literal_string(&name);
 
    /* Lowercased name */
    zend_string *lc_name = zend_string_tolower(name);
    zend_add_literal_string(&lc_name);
 
    return ret;
}
/* }}} */
 
static int zend_add_const_name_literal(zend_string *name, bool unqualified) /* {{{ */
{
    zend_string *tmp_name;
 
    int ret = zend_add_literal_string(&name);
 
    size_t ns_len = 0, after_ns_len = ZSTR_LEN(name);
    const char *after_ns = zend_memrchr(ZSTR_VAL(name), '\\', ZSTR_LEN(name));
    if (after_ns) {
        after_ns += 1;
        ns_len = after_ns - ZSTR_VAL(name) - 1;
        after_ns_len = ZSTR_LEN(name) - ns_len - 1;
 
        /* lowercased namespace name & original constant name */
        tmp_name = zend_string_init(ZSTR_VAL(name), ZSTR_LEN(name), 0);
        zend_str_tolower(ZSTR_VAL(tmp_name), ns_len);
        zend_add_literal_string(&tmp_name);
 
        if (!unqualified) {
            return ret;
        }
    } else {
        after_ns = ZSTR_VAL(name);
    }
 
    /* original unqualified constant name */
    tmp_name = zend_string_init(after_ns, after_ns_len, 0);
    zend_add_literal_string(&tmp_name);
 
    return ret;
}
/* }}} */
 
#define LITERAL_STR(op, str) do { \
        zval _c; \
        ZVAL_STR(&_c, str); \
        op.constant = zend_add_literal(&_c); \
    } while (0)
 
void zend_stop_lexing(void)
{
    if (LANG_SCNG(on_event)) {
        LANG_SCNG(on_event)(ON_STOP, END, 0, NULL, 0, LANG_SCNG(on_event_context));
    }
 
    LANG_SCNG(yy_cursor) = LANG_SCNG(yy_limit);
}
 
static inline void zend_begin_loop(
        uint8_t free_opcode, const znode *loop_var, bool is_switch) /* {{{ */
{
    zend_brk_cont_element *brk_cont_element;
    int parent = CG(context).current_brk_cont;
    zend_loop_var info = {0};
 
    CG(context).current_brk_cont = CG(context).last_brk_cont;
    brk_cont_element = get_next_brk_cont_element();
    brk_cont_element->parent = parent;
    brk_cont_element->is_switch = is_switch;
 
    if (loop_var && (loop_var->op_type & (IS_VAR|IS_TMP_VAR))) {
        uint32_t start = get_next_op_number();
 
        info.opcode = free_opcode;
        info.var_type = loop_var->op_type;
        info.var_num = loop_var->u.op.var;
        brk_cont_element->start = start;
    } else {
        info.opcode = ZEND_NOP;
        /* The start field is used to free temporary variables in case of exceptions.
         * We won't try to free something of we don't have loop variable.  */
        brk_cont_element->start = -1;
    }
 
    zend_stack_push(&CG(loop_var_stack), &info);
}
/* }}} */
 
static inline void zend_end_loop(int cont_addr, const znode *var_node) /* {{{ */
{
    uint32_t end = get_next_op_number();
    zend_brk_cont_element *brk_cont_element
        = &CG(context).brk_cont_array[CG(context).current_brk_cont];
    brk_cont_element->cont = cont_addr;
    brk_cont_element->brk = end;
    CG(context).current_brk_cont = brk_cont_element->parent;
 
    zend_stack_del_top(&CG(loop_var_stack));
}
/* }}} */
 
static void zend_do_free(znode *op1) /* {{{ */
{
    if (op1->op_type == IS_TMP_VAR) {
        zend_op *opline = &CG(active_op_array)->opcodes[CG(active_op_array)->last-1];
 
        while (opline->opcode == ZEND_END_SILENCE ||
               opline->opcode == ZEND_OP_DATA) {
            opline--;
        }
 
        if (opline->result_type == IS_TMP_VAR && opline->result.var == op1->u.op.var) {
            switch (opline->opcode) {
                case ZEND_BOOL:
                case ZEND_BOOL_NOT:
                    /* boolean results don't have to be freed */
                    return;
                case ZEND_POST_INC_STATIC_PROP:
                case ZEND_POST_DEC_STATIC_PROP:
                case ZEND_POST_INC_OBJ:
                case ZEND_POST_DEC_OBJ:
                case ZEND_POST_INC:
                case ZEND_POST_DEC:
                    /* convert $i++ to ++$i */
                    opline->opcode -= 2;
                    SET_UNUSED(opline->result);
                    return;
                case ZEND_ASSIGN:
                case ZEND_ASSIGN_DIM:
                case ZEND_ASSIGN_OBJ:
                case ZEND_ASSIGN_STATIC_PROP:
                case ZEND_ASSIGN_OP:
                case ZEND_ASSIGN_DIM_OP:
                case ZEND_ASSIGN_OBJ_OP:
                case ZEND_ASSIGN_STATIC_PROP_OP:
                case ZEND_PRE_INC_STATIC_PROP:
                case ZEND_PRE_DEC_STATIC_PROP:
                case ZEND_PRE_INC_OBJ:
                case ZEND_PRE_DEC_OBJ:
                case ZEND_PRE_INC:
                case ZEND_PRE_DEC:
                    SET_UNUSED(opline->result);
                    return;
            }
        }
 
        zend_emit_op(NULL, ZEND_FREE, op1, NULL);
    } else if (op1->op_type == IS_VAR) {
        zend_op *opline = &CG(active_op_array)->opcodes[CG(active_op_array)->last-1];
        while (opline->opcode == ZEND_END_SILENCE ||
                opline->opcode == ZEND_EXT_FCALL_END ||
                opline->opcode == ZEND_OP_DATA) {
            opline--;
        }
        if (opline->result_type == IS_VAR
            && opline->result.var == op1->u.op.var) {
            if (opline->opcode == ZEND_FETCH_THIS) {
                opline->opcode = ZEND_NOP;
            }
            if (!ZEND_OP_IS_FRAMELESS_ICALL(opline->opcode)) {
                SET_UNUSED(opline->result);
            } else {
                /* Frameless calls usually use the return value, so always emit a free. This should be
                 * faster than checking RETURN_VALUE_USED inside the handler. */
                // FIXME: We may actually look at the function signature to determine whether a free
                // is necessary.
                zend_emit_op(NULL, ZEND_FREE, op1, NULL);
            }
        } else {
            while (opline >= CG(active_op_array)->opcodes) {
                if ((opline->opcode == ZEND_FETCH_LIST_R ||
                     opline->opcode == ZEND_FETCH_LIST_W) &&
                    opline->op1_type == IS_VAR &&
                    opline->op1.var == op1->u.op.var) {
                    zend_emit_op(NULL, ZEND_FREE, op1, NULL);
                    return;
                }
                if (opline->result_type == IS_VAR
                    && opline->result.var == op1->u.op.var) {
                    if (opline->opcode == ZEND_NEW) {
                        zend_emit_op(NULL, ZEND_FREE, op1, NULL);
                    }
                    break;
                }
                opline--;
            }
        }
    } else if (op1->op_type == IS_CONST) {
        /* Destroy value without using GC: When opcache moves arrays into SHM it will
         * free the zend_array structure, so references to it from outside the op array
         * become invalid. GC would cause such a reference in the root buffer. */
        zval_ptr_dtor_nogc(&op1->u.constant);
    }
}
/* }}} */
 
 
static char *zend_modifier_token_to_string(uint32_t token)
{
    switch (token) {
        case T_PUBLIC:
            return "public";
        case T_PROTECTED:
            return "protected";
        case T_PRIVATE:
            return "private";
        case T_STATIC:
            return "static";
        case T_FINAL:
            return "final";
        case T_READONLY:
            return "readonly";
        case T_ABSTRACT:
            return "abstract";
        case T_PUBLIC_SET:
            return "public(set)";
        case T_PROTECTED_SET:
            return "protected(set)";
        case T_PRIVATE_SET:
            return "private(set)";
        EMPTY_SWITCH_DEFAULT_CASE()
    }
}
 
uint32_t zend_modifier_token_to_flag(zend_modifier_target target, uint32_t token)
{
    switch (token) {
        case T_PUBLIC:
            if (target != ZEND_MODIFIER_TARGET_PROPERTY_HOOK) {
                return ZEND_ACC_PUBLIC;
            }
            break;
        case T_PROTECTED:
            if (target != ZEND_MODIFIER_TARGET_PROPERTY_HOOK) {
                return ZEND_ACC_PROTECTED;
            }
            break;
        case T_PRIVATE:
            if (target != ZEND_MODIFIER_TARGET_PROPERTY_HOOK) {
                return ZEND_ACC_PRIVATE;
            }
            break;
        case T_READONLY:
            if (target == ZEND_MODIFIER_TARGET_PROPERTY || target == ZEND_MODIFIER_TARGET_CPP) {
                return ZEND_ACC_READONLY;
            }
            break;
        case T_ABSTRACT:
            if (target == ZEND_MODIFIER_TARGET_METHOD || target == ZEND_MODIFIER_TARGET_PROPERTY) {
                return ZEND_ACC_ABSTRACT;
            }
            break;
        case T_FINAL:
            if (target == ZEND_MODIFIER_TARGET_METHOD
                || target == ZEND_MODIFIER_TARGET_CONSTANT
                || target == ZEND_MODIFIER_TARGET_PROPERTY
                || target == ZEND_MODIFIER_TARGET_PROPERTY_HOOK) {
                return ZEND_ACC_FINAL;
            }
            break;
        case T_STATIC:
            if (target == ZEND_MODIFIER_TARGET_PROPERTY || target == ZEND_MODIFIER_TARGET_METHOD) {
                return ZEND_ACC_STATIC;
            }
            break;
        case T_PUBLIC_SET:
            if (target == ZEND_MODIFIER_TARGET_PROPERTY || target == ZEND_MODIFIER_TARGET_CPP) {
                return ZEND_ACC_PUBLIC_SET;
            }
            break;
        case T_PROTECTED_SET:
            if (target == ZEND_MODIFIER_TARGET_PROPERTY || target == ZEND_MODIFIER_TARGET_CPP) {
                return ZEND_ACC_PROTECTED_SET;
            }
            break;
        case T_PRIVATE_SET:
            if (target == ZEND_MODIFIER_TARGET_PROPERTY || target == ZEND_MODIFIER_TARGET_CPP) {
                return ZEND_ACC_PRIVATE_SET;
            }
            break;
    }
 
    char *member;
    if (target == ZEND_MODIFIER_TARGET_PROPERTY) {
        member = "property";
    } else if (target == ZEND_MODIFIER_TARGET_METHOD) {
        member = "method";
    } else if (target == ZEND_MODIFIER_TARGET_CONSTANT) {
        member = "class constant";
    } else if (target == ZEND_MODIFIER_TARGET_CPP) {
        member = "parameter";
    } else if (target == ZEND_MODIFIER_TARGET_PROPERTY_HOOK) {
        member = "property hook";
    } else {
        ZEND_UNREACHABLE();
    }
 
    zend_throw_exception_ex(zend_ce_compile_error, 0,
        "Cannot use the %s modifier on a %s", zend_modifier_token_to_string(token), member);
    return 0;
}
 
uint32_t zend_modifier_list_to_flags(zend_modifier_target target, zend_ast *modifiers)
{
    uint32_t flags = 0;
    zend_ast_list *modifier_list = zend_ast_get_list(modifiers);
 
    for (uint32_t i = 0; i < modifier_list->children; i++) {
        uint32_t new_flag = zend_modifier_token_to_flag(target, (uint32_t) Z_LVAL_P(zend_ast_get_zval(modifier_list->child[i])));
        if (!new_flag) {
            return 0;
        }
        flags = zend_add_member_modifier(flags, new_flag, target);
        if (!flags) {
            return 0;
        }
    }
 
    return flags;
}
 
uint32_t zend_add_class_modifier(uint32_t flags, uint32_t new_flag) /* {{{ */
{
    uint32_t new_flags = flags | new_flag;
    if ((flags & ZEND_ACC_EXPLICIT_ABSTRACT_CLASS) && (new_flag & ZEND_ACC_EXPLICIT_ABSTRACT_CLASS)) {
        zend_throw_exception(zend_ce_compile_error,
            "Multiple abstract modifiers are not allowed", 0);
        return 0;
    }
    if ((flags & ZEND_ACC_FINAL) && (new_flag & ZEND_ACC_FINAL)) {
        zend_throw_exception(zend_ce_compile_error, "Multiple final modifiers are not allowed", 0);
        return 0;
    }
    if ((flags & ZEND_ACC_READONLY_CLASS) && (new_flag & ZEND_ACC_READONLY_CLASS)) {
        zend_throw_exception(zend_ce_compile_error, "Multiple readonly modifiers are not allowed", 0);
        return 0;
    }
    if ((new_flags & ZEND_ACC_EXPLICIT_ABSTRACT_CLASS) && (new_flags & ZEND_ACC_FINAL)) {
        zend_throw_exception(zend_ce_compile_error,
            "Cannot use the final modifier on an abstract class", 0);
        return 0;
    }
    return new_flags;
}
/* }}} */
 
uint32_t zend_add_anonymous_class_modifier(uint32_t flags, uint32_t new_flag)
{
    uint32_t new_flags = flags | new_flag;
    if (new_flag & ZEND_ACC_EXPLICIT_ABSTRACT_CLASS) {
        zend_throw_exception(zend_ce_compile_error,
            "Cannot use the abstract modifier on an anonymous class", 0);
        return 0;
    }
    if (new_flag & ZEND_ACC_FINAL) {
        zend_throw_exception(zend_ce_compile_error, "Cannot use the final modifier on an anonymous class", 0);
        return 0;
    }
    if ((flags & ZEND_ACC_READONLY_CLASS) && (new_flag & ZEND_ACC_READONLY_CLASS)) {
        zend_throw_exception(zend_ce_compile_error, "Multiple readonly modifiers are not allowed", 0);
        return 0;
    }
    return new_flags;
}
 
uint32_t zend_add_member_modifier(uint32_t flags, uint32_t new_flag, zend_modifier_target target) /* {{{ */
{
    uint32_t new_flags = flags | new_flag;
    if ((flags & ZEND_ACC_PPP_MASK) && (new_flag & ZEND_ACC_PPP_MASK)) {
        zend_throw_exception(zend_ce_compile_error,
            "Multiple access type modifiers are not allowed", 0);
        return 0;
    }
    if ((flags & ZEND_ACC_ABSTRACT) && (new_flag & ZEND_ACC_ABSTRACT)) {
        zend_throw_exception(zend_ce_compile_error, "Multiple abstract modifiers are not allowed", 0);
        return 0;
    }
    if ((flags & ZEND_ACC_STATIC) && (new_flag & ZEND_ACC_STATIC)) {
        zend_throw_exception(zend_ce_compile_error, "Multiple static modifiers are not allowed", 0);
        return 0;
    }
    if ((flags & ZEND_ACC_FINAL) && (new_flag & ZEND_ACC_FINAL)) {
        zend_throw_exception(zend_ce_compile_error, "Multiple final modifiers are not allowed", 0);
        return 0;
    }
    if ((flags & ZEND_ACC_READONLY) && (new_flag & ZEND_ACC_READONLY)) {
        zend_throw_exception(zend_ce_compile_error,
            "Multiple readonly modifiers are not allowed", 0);
        return 0;
    }
    if ((new_flags & ZEND_ACC_ABSTRACT) && (new_flags & ZEND_ACC_FINAL)) {
        if (target == ZEND_MODIFIER_TARGET_METHOD) {
            zend_throw_exception(zend_ce_compile_error,
                "Cannot use the final modifier on an abstract method", 0);
            return 0;
        }
        if (target == ZEND_MODIFIER_TARGET_PROPERTY) {
            zend_throw_exception(zend_ce_compile_error,
                "Cannot use the final modifier on an abstract property", 0);
            return 0;
        }
    }
    if (target == ZEND_MODIFIER_TARGET_PROPERTY || target == ZEND_MODIFIER_TARGET_CPP) {
        if ((flags & ZEND_ACC_PPP_SET_MASK) && (new_flag & ZEND_ACC_PPP_SET_MASK)) {
            zend_throw_exception(zend_ce_compile_error,
                "Multiple access type modifiers are not allowed", 0);
            return 0;
        }
    }
    return new_flags;
}
/* }}} */
 
ZEND_API zend_string *zend_create_member_string(zend_string *class_name, zend_string *member_name) {
    return zend_string_concat3(
        ZSTR_VAL(class_name), ZSTR_LEN(class_name),
        "::", sizeof("::") - 1,
        ZSTR_VAL(member_name), ZSTR_LEN(member_name));
}
 
static zend_string *zend_concat_names(char *name1, size_t name1_len, char *name2, size_t name2_len) {
    return zend_string_concat3(name1, name1_len, "\\", 1, name2, name2_len);
}
 
static zend_string *zend_prefix_with_ns(zend_string *name) {
    if (FC(current_namespace)) {
        zend_string *ns = FC(current_namespace);
        return zend_concat_names(ZSTR_VAL(ns), ZSTR_LEN(ns), ZSTR_VAL(name), ZSTR_LEN(name));
    } else {
        return zend_string_copy(name);
    }
}
 
static zend_string *zend_resolve_non_class_name(
    zend_string *name, uint32_t type, bool *is_fully_qualified,
    bool case_sensitive, HashTable *current_import_sub
) {
    char *compound;
    *is_fully_qualified = 0;
 
    if (ZSTR_VAL(name)[0] == '\\') {
        /* Remove \ prefix (only relevant if this is a string rather than a label) */
        *is_fully_qualified = 1;
        return zend_string_init(ZSTR_VAL(name) + 1, ZSTR_LEN(name) - 1, 0);
    }
 
    if (type == ZEND_NAME_FQ) {
        *is_fully_qualified = 1;
        return zend_string_copy(name);
    }
 
    if (type == ZEND_NAME_RELATIVE) {
        *is_fully_qualified = 1;
        return zend_prefix_with_ns(name);
    }
 
    if (current_import_sub) {
        /* If an unqualified name is a function/const alias, replace it. */
        zend_string *import_name;
        if (case_sensitive) {
            import_name = zend_hash_find_ptr(current_import_sub, name);
        } else {
            import_name = zend_hash_find_ptr_lc(current_import_sub, name);
        }
 
        if (import_name) {
            *is_fully_qualified = 1;
            return zend_string_copy(import_name);
        }
    }
 
    compound = memchr(ZSTR_VAL(name), '\\', ZSTR_LEN(name));
    if (compound) {
        *is_fully_qualified = 1;
    }
 
    if (compound && FC(imports)) {
        /* If the first part of a qualified name is an alias, substitute it. */
        size_t len = compound - ZSTR_VAL(name);
        zend_string *import_name = zend_hash_str_find_ptr_lc(FC(imports), ZSTR_VAL(name), len);
 
        if (import_name) {
            return zend_concat_names(
                ZSTR_VAL(import_name), ZSTR_LEN(import_name), ZSTR_VAL(name) + len + 1, ZSTR_LEN(name) - len - 1);
        }
    }
 
    return zend_prefix_with_ns(name);
}
/* }}} */
 
static zend_string *zend_resolve_function_name(zend_string *name, uint32_t type, bool *is_fully_qualified)
{
    return zend_resolve_non_class_name(
        name, type, is_fully_qualified, 0, FC(imports_function));
}
 
static zend_string *zend_resolve_const_name(zend_string *name, uint32_t type, bool *is_fully_qualified)
{
    return zend_resolve_non_class_name(
        name, type, is_fully_qualified, 1, FC(imports_const));
}
 
static zend_string *zend_resolve_class_name(zend_string *name, uint32_t type) /* {{{ */
{
    char *compound;
 
    if (ZEND_FETCH_CLASS_DEFAULT != zend_get_class_fetch_type(name)) {
        if (type == ZEND_NAME_FQ) {
            zend_error_noreturn(E_COMPILE_ERROR,
                "'\\%s' is an invalid class name", ZSTR_VAL(name));
        }
        if (type == ZEND_NAME_RELATIVE) {
            zend_error_noreturn(E_COMPILE_ERROR,
                "'namespace\\%s' is an invalid class name", ZSTR_VAL(name));
        }
        ZEND_ASSERT(type == ZEND_NAME_NOT_FQ);
        return zend_string_copy(name);
    }
 
    if (type == ZEND_NAME_RELATIVE) {
        return zend_prefix_with_ns(name);
    }
 
    if (type == ZEND_NAME_FQ) {
        if (ZSTR_VAL(name)[0] == '\\') {
            /* Remove \ prefix (only relevant if this is a string rather than a label) */
            name = zend_string_init(ZSTR_VAL(name) + 1, ZSTR_LEN(name) - 1, 0);
            if (ZEND_FETCH_CLASS_DEFAULT != zend_get_class_fetch_type(name)) {
                zend_error_noreturn(E_COMPILE_ERROR,
                    "'\\%s' is an invalid class name", ZSTR_VAL(name));
            }
            return name;
        }
 
        return zend_string_copy(name);
    }
 
    if (FC(imports)) {
        compound = memchr(ZSTR_VAL(name), '\\', ZSTR_LEN(name));
        if (compound) {
            /* If the first part of a qualified name is an alias, substitute it. */
            size_t len = compound - ZSTR_VAL(name);
            zend_string *import_name =
                zend_hash_str_find_ptr_lc(FC(imports), ZSTR_VAL(name), len);
 
            if (import_name) {
                return zend_concat_names(
                    ZSTR_VAL(import_name), ZSTR_LEN(import_name), ZSTR_VAL(name) + len + 1, ZSTR_LEN(name) - len - 1);
            }
        } else {
            /* If an unqualified name is an alias, replace it. */
            zend_string *import_name
                = zend_hash_find_ptr_lc(FC(imports), name);
 
            if (import_name) {
                return zend_string_copy(import_name);
            }
        }
    }
 
    /* If not fully qualified and not an alias, prepend the current namespace */
    return zend_prefix_with_ns(name);
}
/* }}} */
 
static zend_string *zend_resolve_class_name_ast(zend_ast *ast) /* {{{ */
{
    zval *class_name = zend_ast_get_zval(ast);
    if (Z_TYPE_P(class_name) != IS_STRING) {
        zend_error_noreturn(E_COMPILE_ERROR, "Illegal class name");
    }
    return zend_resolve_class_name(Z_STR_P(class_name), ast->attr);
}
/* }}} */
 
static void label_ptr_dtor(zval *zv) /* {{{ */
{
    efree_size(Z_PTR_P(zv), sizeof(zend_label));
}
/* }}} */
 
static void str_dtor(zval *zv)  /* {{{ */ {
    zend_string_release_ex(Z_STR_P(zv), 0);
}
/* }}} */
 
static bool zend_is_call(zend_ast *ast);
 
static uint32_t zend_add_try_element(uint32_t try_op) /* {{{ */
{
    zend_op_array *op_array = CG(active_op_array);
    uint32_t try_catch_offset = op_array->last_try_catch++;
    zend_try_catch_element *elem;
 
    op_array->try_catch_array = safe_erealloc(
        op_array->try_catch_array, sizeof(zend_try_catch_element), op_array->last_try_catch, 0);
 
    elem = &op_array->try_catch_array[try_catch_offset];
    elem->try_op = try_op;
    elem->catch_op = 0;
    elem->finally_op = 0;
    elem->finally_end = 0;
 
    return try_catch_offset;
}
/* }}} */
 
ZEND_API void function_add_ref(zend_function *function) /* {{{ */
{
    if (function->type == ZEND_USER_FUNCTION) {
        zend_op_array *op_array = &function->op_array;
        if (op_array->refcount) {
            (*op_array->refcount)++;
        }
 
        ZEND_MAP_PTR_INIT(op_array->run_time_cache, NULL);
        ZEND_MAP_PTR_INIT(op_array->static_variables_ptr, NULL);
    }
 
    if (function->common.function_name) {
        zend_string_addref(function->common.function_name);
    }
}
/* }}} */
 
static zend_never_inline ZEND_COLD ZEND_NORETURN void do_bind_function_error(zend_string *lcname, zend_op_array *op_array, bool compile_time) /* {{{ */
{
    zval *zv = zend_hash_find_known_hash(compile_time ? CG(function_table) : EG(function_table), lcname);
    int error_level = compile_time ? E_COMPILE_ERROR : E_ERROR;
    zend_function *old_function;
 
    ZEND_ASSERT(zv != NULL);
    old_function = (zend_function*)Z_PTR_P(zv);
    if (old_function->type == ZEND_USER_FUNCTION
        && old_function->op_array.last > 0) {
        zend_error_noreturn(error_level, "Cannot redeclare function %s() (previously declared in %s:%d)",
                    op_array ? ZSTR_VAL(op_array->function_name) : ZSTR_VAL(old_function->common.function_name),
                    ZSTR_VAL(old_function->op_array.filename),
                    old_function->op_array.line_start);
    } else {
        zend_error_noreturn(error_level, "Cannot redeclare function %s()",
            op_array ? ZSTR_VAL(op_array->function_name) : ZSTR_VAL(old_function->common.function_name));
    }
}
 
ZEND_API zend_result do_bind_function(zend_function *func, zval *lcname) /* {{{ */
{
    zend_function *added_func = zend_hash_add_ptr(EG(function_table), Z_STR_P(lcname), func);
    if (UNEXPECTED(!added_func)) {
        do_bind_function_error(Z_STR_P(lcname), &func->op_array, 0);
        return FAILURE;
    }
 
    if (func->op_array.refcount) {
        ++*func->op_array.refcount;
    }
    if (func->common.function_name) {
        zend_string_addref(func->common.function_name);
    }
    zend_observer_function_declared_notify(&func->op_array, Z_STR_P(lcname));
    return SUCCESS;
}
/* }}} */
 
ZEND_API zend_class_entry *zend_bind_class_in_slot(
        zval *class_table_slot, zval *lcname, zend_string *lc_parent_name)
{
    zend_class_entry *ce = Z_PTR_P(class_table_slot);
    bool is_preloaded =
        (ce->ce_flags & ZEND_ACC_PRELOADED) && !(CG(compiler_options) & ZEND_COMPILE_PRELOAD);
    bool success;
    if (EXPECTED(!is_preloaded)) {
        success = zend_hash_set_bucket_key(EG(class_table), (Bucket*) class_table_slot, Z_STR_P(lcname)) != NULL;
    } else {
        /* If preloading is used, don't replace the existing bucket, add a new one. */
        success = zend_hash_add_ptr(EG(class_table), Z_STR_P(lcname), ce) != NULL;
    }
    if (UNEXPECTED(!success)) {
        zend_class_entry *old_class = zend_hash_find_ptr(EG(class_table), Z_STR_P(lcname));
        ZEND_ASSERT(old_class);
        zend_class_redeclaration_error(E_COMPILE_ERROR, old_class);
        return NULL;
    }
 
    if (ce->ce_flags & ZEND_ACC_LINKED) {
        zend_observer_class_linked_notify(ce, Z_STR_P(lcname));
        return ce;
    }
 
    ce = zend_do_link_class(ce, lc_parent_name, Z_STR_P(lcname));
    if (ce) {
        ZEND_ASSERT(!EG(exception));
        zend_observer_class_linked_notify(ce, Z_STR_P(lcname));
        return ce;
    }
 
    if (!is_preloaded) {
        /* Reload bucket pointer, the hash table may have been reallocated */
        zval *zv = zend_hash_find(EG(class_table), Z_STR_P(lcname));
        zend_hash_set_bucket_key(EG(class_table), (Bucket *) zv, Z_STR_P(lcname + 1));
    } else {
        zend_hash_del(EG(class_table), Z_STR_P(lcname));
    }
    return NULL;
}
 
ZEND_API zend_result do_bind_class(zval *lcname, zend_string *lc_parent_name) /* {{{ */
{
    zend_class_entry *ce;
    zval *rtd_key, *zv;
 
    rtd_key = lcname + 1;
 
    zv = zend_hash_find_known_hash(EG(class_table), Z_STR_P(rtd_key));
 
    if (UNEXPECTED(!zv)) {
        ce = zend_hash_find_ptr(EG(class_table), Z_STR_P(lcname));
        ZEND_ASSERT(ce);
        zend_class_redeclaration_error(E_COMPILE_ERROR, ce);
        return FAILURE;
    }
 
    /* Register the derived class */
    return zend_bind_class_in_slot(zv, lcname, lc_parent_name) ? SUCCESS : FAILURE;
}
/* }}} */
 
static zend_string *add_type_string(zend_string *type, zend_string *new_type, bool is_intersection) {
    zend_string *result;
    if (type == NULL) {
        return zend_string_copy(new_type);
    }
 
    if (is_intersection) {
        result = zend_string_concat3(ZSTR_VAL(type), ZSTR_LEN(type),
            "&", 1, ZSTR_VAL(new_type), ZSTR_LEN(new_type));
        zend_string_release(type);
    } else {
        result = zend_string_concat3(
            ZSTR_VAL(type), ZSTR_LEN(type), "|", 1, ZSTR_VAL(new_type), ZSTR_LEN(new_type));
        zend_string_release(type);
    }
    return result;
}
 
static zend_string *resolve_class_name(zend_string *name, zend_class_entry *scope) {
    if (scope) {
        if (zend_string_equals_literal_ci(name, "self")) {
            name = scope->name;
        } else if (zend_string_equals_literal_ci(name, "parent") && scope->parent) {
            name = scope->parent->name;
        }
    }
 
    /* The resolved name for anonymous classes contains null bytes. Cut off everything after the
     * null byte here, to avoid larger parts of the type being omitted by printing code later. */
    size_t len = strlen(ZSTR_VAL(name));
    if (len != ZSTR_LEN(name)) {
        ZEND_ASSERT(scope && "This should only happen with resolved types");
        return zend_string_init(ZSTR_VAL(name), len, 0);
    }
    return zend_string_copy(name);
}
 
static zend_string *add_intersection_type(zend_string *str,
    zend_type_list *intersection_type_list, zend_class_entry *scope,
    bool is_bracketed)
{
    zend_type *single_type;
    zend_string *intersection_str = NULL;
 
    ZEND_TYPE_LIST_FOREACH(intersection_type_list, single_type) {
        ZEND_ASSERT(!ZEND_TYPE_HAS_LIST(*single_type));
        ZEND_ASSERT(ZEND_TYPE_HAS_NAME(*single_type));
        zend_string *name = ZEND_TYPE_NAME(*single_type);
        zend_string *resolved = resolve_class_name(name, scope);
        intersection_str = add_type_string(intersection_str, resolved, /* is_intersection */ true);
        zend_string_release(resolved);
    } ZEND_TYPE_LIST_FOREACH_END();
 
    ZEND_ASSERT(intersection_str);
 
    if (is_bracketed) {
        zend_string *result = zend_string_concat3("(", 1, ZSTR_VAL(intersection_str), ZSTR_LEN(intersection_str), ")", 1);
        zend_string_release(intersection_str);
        intersection_str = result;
    }
    str = add_type_string(str, intersection_str, /* is_intersection */ false);
    zend_string_release(intersection_str);
    return str;
}
 
zend_string *zend_type_to_string_resolved(zend_type type, zend_class_entry *scope) {
    zend_string *str = NULL;
 
    /* Pure intersection type */
    if (ZEND_TYPE_IS_INTERSECTION(type)) {
        ZEND_ASSERT(!ZEND_TYPE_IS_UNION(type));
        str = add_intersection_type(str, ZEND_TYPE_LIST(type), scope, /* is_bracketed */ false);
    } else if (ZEND_TYPE_HAS_LIST(type)) {
        /* A union type might not be a list */
        zend_type *list_type;
        ZEND_TYPE_LIST_FOREACH(ZEND_TYPE_LIST(type), list_type) {
            if (ZEND_TYPE_IS_INTERSECTION(*list_type)) {
                str = add_intersection_type(str, ZEND_TYPE_LIST(*list_type), scope, /* is_bracketed */ true);
                continue;
            }
            ZEND_ASSERT(!ZEND_TYPE_HAS_LIST(*list_type));
            ZEND_ASSERT(ZEND_TYPE_HAS_NAME(*list_type));
            zend_string *name = ZEND_TYPE_NAME(*list_type);
            zend_string *resolved = resolve_class_name(name, scope);
            str = add_type_string(str, resolved, /* is_intersection */ false);
            zend_string_release(resolved);
        } ZEND_TYPE_LIST_FOREACH_END();
    } else if (ZEND_TYPE_HAS_NAME(type)) {
        str = resolve_class_name(ZEND_TYPE_NAME(type), scope);
    }
 
    uint32_t type_mask = ZEND_TYPE_PURE_MASK(type);
 
    if (type_mask == MAY_BE_ANY) {
        str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_MIXED), /* is_intersection */ false);
 
        return str;
    }
    if (type_mask & MAY_BE_STATIC) {
        zend_string *name = ZSTR_KNOWN(ZEND_STR_STATIC);
        // During compilation of eval'd code the called scope refers to the scope calling the eval
        if (scope && !zend_is_compiling()) {
            zend_class_entry *called_scope = zend_get_called_scope(EG(current_execute_data));
            if (called_scope) {
                name = called_scope->name;
            }
        }
        str = add_type_string(str, name, /* is_intersection */ false);
    }
    if (type_mask & MAY_BE_CALLABLE) {
        str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_CALLABLE), /* is_intersection */ false);
    }
    if (type_mask & MAY_BE_OBJECT) {
        str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_OBJECT), /* is_intersection */ false);
    }
    if (type_mask & MAY_BE_ARRAY) {
        str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_ARRAY), /* is_intersection */ false);
    }
    if (type_mask & MAY_BE_STRING) {
        str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_STRING), /* is_intersection */ false);
    }
    if (type_mask & MAY_BE_LONG) {
        str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_INT), /* is_intersection */ false);
    }
    if (type_mask & MAY_BE_DOUBLE) {
        str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_FLOAT), /* is_intersection */ false);
    }
    if ((type_mask & MAY_BE_BOOL) == MAY_BE_BOOL) {
        str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_BOOL), /* is_intersection */ false);
    } else if (type_mask & MAY_BE_FALSE) {
        str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_FALSE), /* is_intersection */ false);
    } else if (type_mask & MAY_BE_TRUE) {
        str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_TRUE), /* is_intersection */ false);
    }
    if (type_mask & MAY_BE_VOID) {
        str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_VOID), /* is_intersection */ false);
    }
    if (type_mask & MAY_BE_NEVER) {
        str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_NEVER), /* is_intersection */ false);
    }
 
    if (type_mask & MAY_BE_NULL) {
        bool is_union = !str || memchr(ZSTR_VAL(str), '|', ZSTR_LEN(str)) != NULL;
        bool has_intersection = !str || memchr(ZSTR_VAL(str), '&', ZSTR_LEN(str)) != NULL;
        if (!is_union && !has_intersection) {
            zend_string *nullable_str = zend_string_concat2("?", 1, ZSTR_VAL(str), ZSTR_LEN(str));
            zend_string_release(str);
            return nullable_str;
        }
 
        str = add_type_string(str, ZSTR_KNOWN(ZEND_STR_NULL_LOWERCASE), /* is_intersection */ false);
    }
    return str;
}
 
ZEND_API zend_string *zend_type_to_string(zend_type type) {
    return zend_type_to_string_resolved(type, NULL);
}
 
static bool is_generator_compatible_class_type(zend_string *name) {
    return zend_string_equals_ci(name, ZSTR_KNOWN(ZEND_STR_TRAVERSABLE))
        || zend_string_equals_literal_ci(name, "Iterator")
        || zend_string_equals_literal_ci(name, "Generator");
}
 
static void zend_mark_function_as_generator(void) /* {{{ */
{
    if (!CG(active_op_array)->function_name) {
        zend_error_noreturn(E_COMPILE_ERROR,
            "The \"yield\" expression can only be used inside a function");
    }
 
    if (CG(active_op_array)->fn_flags & ZEND_ACC_HAS_RETURN_TYPE) {
        zend_type return_type = CG(active_op_array)->arg_info[-1].type;
        bool valid_type = (ZEND_TYPE_FULL_MASK(return_type) & MAY_BE_OBJECT) != 0;
        if (!valid_type) {
            zend_type *single_type;
            ZEND_TYPE_FOREACH(return_type, single_type) {
                if (ZEND_TYPE_HAS_NAME(*single_type)
                        && is_generator_compatible_class_type(ZEND_TYPE_NAME(*single_type))) {
                    valid_type = 1;
                    break;
                }
            } ZEND_TYPE_FOREACH_END();
        }
 
        if (!valid_type) {
            zend_string *str = zend_type_to_string(return_type);
            zend_error_noreturn(E_COMPILE_ERROR,
                "Generator return type must be a supertype of Generator, %s given",
                ZSTR_VAL(str));
        }
    }
 
    CG(active_op_array)->fn_flags |= ZEND_ACC_GENERATOR;
}
/* }}} */
 
ZEND_API zend_string *zend_mangle_property_name(const char *src1, size_t src1_length, const char *src2, size_t src2_length, bool internal) /* {{{ */
{
    size_t prop_name_length = 1 + src1_length + 1 + src2_length;
    zend_string *prop_name = zend_string_alloc(prop_name_length, internal);
 
    ZSTR_VAL(prop_name)[0] = '\0';
    memcpy(ZSTR_VAL(prop_name) + 1, src1, src1_length+1);
    memcpy(ZSTR_VAL(prop_name) + 1 + src1_length + 1, src2, src2_length+1);
    return prop_name;
}
/* }}} */
 
ZEND_API zend_result zend_unmangle_property_name_ex(const zend_string *name, const char **class_name, const char **prop_name, size_t *prop_len) /* {{{ */
{
    size_t class_name_len;
    size_t anonclass_src_len;
 
    *class_name = NULL;
 
    if (!ZSTR_LEN(name) || ZSTR_VAL(name)[0] != '\0') {
        *prop_name = ZSTR_VAL(name);
        if (prop_len) {
            *prop_len = ZSTR_LEN(name);
        }
        return SUCCESS;
    }
    if (ZSTR_LEN(name) < 3 || ZSTR_VAL(name)[1] == '\0') {
        zend_error(E_NOTICE, "Illegal member variable name");
        *prop_name = ZSTR_VAL(name);
        if (prop_len) {
            *prop_len = ZSTR_LEN(name);
        }
        return FAILURE;
    }
 
    class_name_len = zend_strnlen(ZSTR_VAL(name) + 1, ZSTR_LEN(name) - 2);
    if (class_name_len >= ZSTR_LEN(name) - 2 || ZSTR_VAL(name)[class_name_len + 1] != '\0') {
        zend_error(E_NOTICE, "Corrupt member variable name");
        *prop_name = ZSTR_VAL(name);
        if (prop_len) {
            *prop_len = ZSTR_LEN(name);
        }
        return FAILURE;
    }
 
    *class_name = ZSTR_VAL(name) + 1;
    anonclass_src_len = zend_strnlen(*class_name + class_name_len + 1, ZSTR_LEN(name) - class_name_len - 2);
    if (class_name_len + anonclass_src_len + 2 != ZSTR_LEN(name)) {
        class_name_len += anonclass_src_len + 1;
    }
    *prop_name = ZSTR_VAL(name) + class_name_len + 2;
    if (prop_len) {
        *prop_len = ZSTR_LEN(name) - class_name_len - 2;
    }
    return SUCCESS;
}
/* }}} */
 
static bool array_is_const_ex(zend_array *array, uint32_t *max_checks)
{
    if (zend_hash_num_elements(array) > *max_checks) {
        return false;
    }
    *max_checks -= zend_hash_num_elements(array);
 
    zval *element;
    ZEND_HASH_FOREACH_VAL(array, element) {
        if (Z_TYPE_P(element) < IS_ARRAY) {
            continue;
        } else if (Z_TYPE_P(element) == IS_ARRAY) {
            if (!array_is_const_ex(array, max_checks)) {
                return false;
            }
        } else {
            return false;
        }
    } ZEND_HASH_FOREACH_END();
 
    return true;
}
 
static bool array_is_const(zend_array *array)
{
    uint32_t max_checks = 50;
    return array_is_const_ex(array, &max_checks);
}
 
static bool can_ct_eval_const(zend_constant *c) {
    if (ZEND_CONSTANT_FLAGS(c) & CONST_DEPRECATED) {
        return 0;
    }
    if ((ZEND_CONSTANT_FLAGS(c) & CONST_PERSISTENT)
            && !(CG(compiler_options) & ZEND_COMPILE_NO_PERSISTENT_CONSTANT_SUBSTITUTION)
            && !((ZEND_CONSTANT_FLAGS(c) & CONST_NO_FILE_CACHE)
                && (CG(compiler_options) & ZEND_COMPILE_WITH_FILE_CACHE))) {
        return 1;
    }
    if (Z_TYPE(c->value) < IS_ARRAY
            && !(CG(compiler_options) & ZEND_COMPILE_NO_CONSTANT_SUBSTITUTION)) {
        return 1;
    } else if (Z_TYPE(c->value) == IS_ARRAY
            && !(CG(compiler_options) & ZEND_COMPILE_NO_CONSTANT_SUBSTITUTION)
            && array_is_const(Z_ARR(c->value))) {
        return 1;
    }
    return 0;
}
 
static bool zend_try_ct_eval_const(zval *zv, zend_string *name, bool is_fully_qualified) /* {{{ */
{
    /* Substitute true, false and null (including unqualified usage in namespaces)
     * before looking up the possibly namespaced name. */
    const char *lookup_name = ZSTR_VAL(name);
    size_t lookup_len = ZSTR_LEN(name);
 
    if (!is_fully_qualified) {
        zend_get_unqualified_name(name, &lookup_name, &lookup_len);
    }
 
    zend_constant *c;
    if ((c = zend_get_special_const(lookup_name, lookup_len))) {
        ZVAL_COPY_VALUE(zv, &c->value);
        return 1;
    }
    c = zend_hash_find_ptr(EG(zend_constants), name);
    if (c && can_ct_eval_const(c)) {
        ZVAL_COPY_OR_DUP(zv, &c->value);
        return 1;
    }
    return 0;
}
/* }}} */
 
static inline bool zend_is_scope_known(void) /* {{{ */
{
    if (!CG(active_op_array)) {
        /* This can only happen when evaluating a default value string. */
        return 0;
    }
 
    if (CG(active_op_array)->fn_flags & ZEND_ACC_CLOSURE) {
        /* Closures can be rebound to a different scope */
        return 0;
    }
 
    if (!CG(active_class_entry)) {
        /* The scope is known if we're in a free function (no scope), but not if we're in
         * a file/eval (which inherits including/eval'ing scope). */
        return CG(active_op_array)->function_name != NULL;
    }
 
    /* For traits self etc refers to the using class, not the trait itself */
    return (CG(active_class_entry)->ce_flags & ZEND_ACC_TRAIT) == 0;
}
/* }}} */
 
static inline bool class_name_refers_to_active_ce(zend_string *class_name, uint32_t fetch_type) /* {{{ */
{
    if (!CG(active_class_entry)) {
        return 0;
    }
    if (fetch_type == ZEND_FETCH_CLASS_SELF && zend_is_scope_known()) {
        return 1;
    }
    return fetch_type == ZEND_FETCH_CLASS_DEFAULT
        && zend_string_equals_ci(class_name, CG(active_class_entry)->name);
}
/* }}} */
 
uint32_t zend_get_class_fetch_type(const zend_string *name) /* {{{ */
{
    if (zend_string_equals_literal_ci(name, "self")) {
        return ZEND_FETCH_CLASS_SELF;
    } else if (zend_string_equals_literal_ci(name, "parent")) {
        return ZEND_FETCH_CLASS_PARENT;
    } else if (zend_string_equals_ci(name, ZSTR_KNOWN(ZEND_STR_STATIC))) {
        return ZEND_FETCH_CLASS_STATIC;
    } else {
        return ZEND_FETCH_CLASS_DEFAULT;
    }
}
/* }}} */
 
static uint32_t zend_get_class_fetch_type_ast(zend_ast *name_ast) /* {{{ */
{
    /* Fully qualified names are always default refs */
    if (name_ast->attr == ZEND_NAME_FQ) {
        return ZEND_FETCH_CLASS_DEFAULT;
    }
 
    return zend_get_class_fetch_type(zend_ast_get_str(name_ast));
}
/* }}} */
 
static zend_string *zend_resolve_const_class_name_reference(zend_ast *ast, const char *type)
{
    zend_string *class_name = zend_ast_get_str(ast);
    if (ZEND_FETCH_CLASS_DEFAULT != zend_get_class_fetch_type_ast(ast)) {
        zend_error_noreturn(E_COMPILE_ERROR,
            "Cannot use \"%s\" as %s, as it is reserved",
            ZSTR_VAL(class_name), type);
    }
    return zend_resolve_class_name(class_name, ast->attr);
}
 
static void zend_ensure_valid_class_fetch_type(uint32_t fetch_type) /* {{{ */
{
    if (fetch_type != ZEND_FETCH_CLASS_DEFAULT && zend_is_scope_known()) {
        zend_class_entry *ce = CG(active_class_entry);
        if (!ce) {
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot use \"%s\" when no class scope is active",
                fetch_type == ZEND_FETCH_CLASS_SELF ? "self" :
                fetch_type == ZEND_FETCH_CLASS_PARENT ? "parent" : "static");
        } else if (fetch_type == ZEND_FETCH_CLASS_PARENT && !ce->parent_name) {
            zend_error_noreturn(E_COMPILE_ERROR,
                "Cannot use \"parent\" when current class scope has no parent");
        }
    }
}
/* }}} */
 
static bool zend_try_compile_const_expr_resolve_class_name(zval *zv, zend_ast *class_ast) /* {{{ */
{
    uint32_t fetch_type;
    zval *class_name;
 
    if (class_ast->kind != ZEND_AST_ZVAL) {
        return 0;
    }
 
    class_name = zend_ast_get_zval(class_ast);
 
    if (Z_TYPE_P(class_name) != IS_STRING) {
        zend_error_noreturn(E_COMPILE_ERROR, "Illegal class name");
    }
 
    fetch_type = zend_get_class_fetch_type(Z_STR_P(class_name));
    zend_ensure_valid_class_fetch_type(fetch_type);
 
    switch (fetch_type) {
        case ZEND_FETCH_CLASS_SELF:
            if (CG(active_class_entry) && zend_is_scope_known()) {
                ZVAL_STR_COPY(zv, CG(active_class_entry)->name);
                return 1;
            }
            return 0;
        case ZEND_FETCH_CLASS_PARENT:
            if (CG(active_class_entry) && CG(active_class_entry)->parent_name
                    && zend_is_scope_known()) {
                ZVAL_STR_COPY(zv, CG(active_class_entry)->parent_name);
                return 1;
            }
            return 0;
        case ZEND_FETCH_CLASS_STATIC:
            return 0;
        case ZEND_FETCH_CLASS_DEFAULT:
            ZVAL_STR(zv, zend_resolve_class_name_ast(class_ast));
            return 1;
        EMPTY_SWITCH_DEFAULT_CASE()
    }
}
/* }}} */
 
/* We don't use zend_verify_const_access because we need to deal with unlinked classes. */
static bool zend_verify_ct_const_access(zend_class_constant *c, zend_class_entry *scope)
{
    if (ZEND_CLASS_CONST_FLAGS(c) & ZEND_ACC_DEPRECATED) {
        return 0;
    } else if (c->ce->ce_flags & ZEND_ACC_TRAIT) {
        /* This condition is only met on directly accessing trait constants,
         * because the ce is replaced to the class entry of the composing class
         * on binding. */
        return 0;
    } else if (ZEND_CLASS_CONST_FLAGS(c) & ZEND_ACC_PUBLIC) {
        return 1;
    } else if (ZEND_CLASS_CONST_FLAGS(c) & ZEND_ACC_PRIVATE) {
        return c->ce == scope;
    } else {
        zend_class_entry *ce = c->ce;
        while (1) {
            if (ce == scope) {
                return 1;
            }
            if (!ce->parent) {
                break;
            }
            if (ce->ce_flags & ZEND_ACC_RESOLVED_PARENT) {
                ce = ce->parent;
            } else {
                ce = zend_hash_find_ptr_lc(CG(class_table), ce->parent_name);
                if (!ce) {
                    break;
                }
            }
        }
        /* Reverse case cannot be true during compilation */
        return 0;
    }
}
 
static bool zend_try_ct_eval_class_const(zval *zv, zend_string *class_name, zend_string *name) /* {{{ */
{
    uint32_t fetch_type = zend_get_class_fetch_type(class_name);
    zend_class_constant *cc;
    zval *c;
 
    if (class_name_refers_to_active_ce(class_name, fetch_type)) {
        cc = zend_hash_find_ptr(&CG(active_class_entry)->constants_table, name);
    } else if (fetch_type == ZEND_FETCH_CLASS_DEFAULT && !(CG(compiler_options) & ZEND_COMPILE_NO_CONSTANT_SUBSTITUTION)) {
        zend_class_entry *ce = zend_hash_find_ptr_lc(CG(class_table), class_name);
        if (ce) {
            cc = zend_hash_find_ptr(&ce->constants_table, name);
        } else {
            return 0;
        }
    } else {
        return 0;
    }
 
    if (CG(compiler_options) & ZEND_COMPILE_NO_PERSISTENT_CONSTANT_SUBSTITUTION) {
        return 0;
    }
 
    if (!cc || !zend_verify_ct_const_access(cc, CG(active_class_entry))) {
        return 0;
    }
 
    c = &cc->value;
 
    /* Substitute case-sensitive (or lowercase) persistent class constants */
    if (Z_TYPE_P(c) < IS_ARRAY) {
        ZVAL_COPY_OR_DUP(zv, c);
        return 1;
    } else if (Z_TYPE_P(c) == IS_ARRAY && array_is_const(Z_ARR_P(c))) {
        ZVAL_COPY_OR_DUP(zv, c);
        return 1;
    }
 
    return 0;
}
/* }}} */
 
static void zend_add_to_list(void *result, void *item) /* {{{ */
{
    void** list = *(void**)result;
    size_t n = 0;
 
    if (list) {
        while (list[n]) {
            n++;
        }
    }
 
    list = erealloc(list, sizeof(void*) * (n+2));
 
    list[n]   = item;
    list[n+1] = NULL;
 
    *(void**)result = list;
}
/* }}} */
 
static void zend_do_extended_stmt(void) /* {{{ */
{
    zend_op *opline;
 
    if (!(CG(compiler_options) & ZEND_COMPILE_EXTENDED_STMT)) {
        return;
    }
 
    opline = get_next_op();
 
    opline->opcode = ZEND_EXT_STMT;
}
/* }}} */
 
static void zend_do_extended_fcall_begin(void) /* {{{ */
{
    zend_op *opline;
 
    if (!(CG(compiler_options) & ZEND_COMPILE_EXTENDED_FCALL)) {
        return;
    }
 
    opline = get_next_op();
 
    opline->opcode = ZEND_EXT_FCALL_BEGIN;
}
/* }}} */
 
static void zend_do_extended_fcall_end(void) /* {{{ */
{
    zend_op *opline;
 
    if (!(CG(compiler_options) & ZEND_COMPILE_EXTENDED_FCALL)) {
        return;
    }
 
    opline = get_next_op();
 
    opline->opcode = ZEND_EXT_FCALL_END;
}
/* }}} */
 
ZEND_API bool zend_is_auto_global_str(const char *name, size_t len) /* {{{ */ {
    zend_auto_global *auto_global;
 
    if ((auto_global = zend_hash_str_find_ptr(CG(auto_globals), name, len)) != NULL) {
        if (auto_global->armed) {
            auto_global->armed = auto_global->auto_global_callback(auto_global->name);
        }
        return 1;
    }
    return 0;
}
/* }}} */
 
ZEND_API bool zend_is_auto_global(zend_string *name) /* {{{ */
{
    zend_auto_global *auto_global;
 
    if ((auto_global = zend_hash_find_ptr(CG(auto_globals), name)) != NULL) {
        if (auto_global->armed) {
            auto_global->armed = auto_global->auto_global_callback(auto_global->name);
        }
        return 1;
    }
    return 0;
}
/* }}} */
 
ZEND_API zend_result zend_register_auto_global(zend_string *name, bool jit, zend_auto_global_callback auto_global_callback) /* {{{ */
{
    zend_auto_global auto_global;
    zend_result retval;
 
    auto_global.name = name;
    auto_global.auto_global_callback = auto_global_callback;
    auto_global.jit = jit;
 
    retval = zend_hash_add_mem(CG(auto_globals), auto_global.name, &auto_global, sizeof(zend_auto_global)) != NULL ? SUCCESS : FAILURE;
 
    return retval;
}
/* }}} */
 
ZEND_API void zend_activate_auto_globals(void) /* {{{ */
{
    zend_auto_global *auto_global;
 
    ZEND_HASH_MAP_FOREACH_PTR(CG(auto_globals), auto_global) {
        if (auto_global->jit) {
            auto_global->armed = 1;
        } else if (auto_global->auto_global_callback) {
            auto_global->armed = auto_global->auto_global_callback(auto_global->name);
        } else {
            auto_global->armed = 0;
        }
    } ZEND_HASH_FOREACH_END();
}
/* }}} */
 
int ZEND_FASTCALL zendlex(zend_parser_stack_elem *elem) /* {{{ */
{
    zval zv;
    int ret;
 
    if (CG(increment_lineno)) {
        CG(zend_lineno)++;
        CG(increment_lineno) = 0;
    }
 
    ret = lex_scan(&zv, elem);
    ZEND_ASSERT(!EG(exception) || ret == T_ERROR);
    return ret;
 
}
/* }}} */
 
ZEND_API void zend_initialize_class_data(zend_class_entry *ce, bool nullify_handlers) /* {{{ */
{
    bool persistent_hashes = ce->type == ZEND_INTERNAL_CLASS;
 
    ce->refcount = 1;
    ce->ce_flags = ZEND_ACC_CONSTANTS_UPDATED;
 
    if (CG(compiler_options) & ZEND_COMPILE_GUARDS) {
        ce->ce_flags |= ZEND_ACC_USE_GUARDS;
    }
 
    ce->default_properties_table = NULL;
    ce->default_static_members_table = NULL;
    zend_hash_init(&ce->properties_info, 8, NULL, NULL, persistent_hashes);
    zend_hash_init(&ce->constants_table, 8, NULL, NULL, persistent_hashes);
    zend_hash_init(&ce->function_table, 8, NULL, ZEND_FUNCTION_DTOR, persistent_hashes);
 
    ce->doc_comment = NULL;
 
    ZEND_MAP_PTR_INIT(ce->static_members_table, NULL);
    ZEND_MAP_PTR_INIT(ce->mutable_data, NULL);
 
    ce->default_object_handlers = &std_object_handlers;
    ce->default_properties_count = 0;
    ce->default_static_members_count = 0;
    ce->properties_info_table = NULL;
    ce->attributes = NULL;
    ce->enum_backing_type = IS_UNDEF;
    ce->backed_enum_table = NULL;
 
    if (nullify_handlers) {
        ce->constructor = NULL;
        ce->destructor = NULL;
        ce->clone = NULL;
        ce->__get = NULL;
        ce->__set = NULL;
        ce->__unset = NULL;
        ce->__isset = NULL;
        ce->__call = NULL;
        ce->__callstatic = NULL;
        ce->__tostring = NULL;
        ce->__serialize = NULL;
        ce->__unserialize = NULL;
        ce->__debugInfo = NULL;
        ce->create_object = NULL;
        ce->get_iterator = NULL;
        ce->iterator_funcs_ptr = NULL;
        ce->arrayaccess_funcs_ptr = NULL;
        ce->get_static_method = NULL;
        ce->parent = NULL;
        ce->parent_name = NULL;
        ce->num_interfaces = 0;
        ce->interfaces = NULL;
        ce->num_traits = 0;
        ce->num_hooked_props = 0;
        ce->num_hooked_prop_variance_checks = 0;
        ce->trait_names = NULL;
        ce->trait_aliases = NULL;
        ce->trait_precedences = NULL;
        ce->serialize = NULL;
        ce->unserialize = NULL;
        if (ce->type == ZEND_INTERNAL_CLASS) {
            ce->info.internal.module = NULL;
            ce->info.internal.builtin_functions = NULL;
        }
    }
}
/* }}} */
 
ZEND_API zend_string *zend_get_compiled_variable_name(const zend_op_array *op_array, uint32_t var) /* {{{ */
{
    return op_array->vars[EX_VAR_TO_NUM(var)];
}
/* }}} */
 
zend_ast *zend_ast_append_str(zend_ast *left_ast, zend_ast *right_ast) /* {{{ */
{
    zval *left_zv = zend_ast_get_zval(left_ast);
    zend_string *left = Z_STR_P(left_zv);
    zend_string *right = zend_ast_get_str(right_ast);
 
    zend_string *result;
    size_t left_len = ZSTR_LEN(left);
    size_t len = left_len + ZSTR_LEN(right) + 1; /* left\right */
 
    result = zend_string_extend(left, len, 0);
    ZSTR_VAL(result)[left_len] = '\\';
    memcpy(&ZSTR_VAL(result)[left_len + 1], ZSTR_VAL(right), ZSTR_LEN(right));
    ZSTR_VAL(result)[len] = '\0';
    zend_string_release_ex(right, 0);
 
    ZVAL_STR(left_zv, result);
    return left_ast;
}
/* }}} */
 
zend_ast *zend_negate_num_string(zend_ast *ast) /* {{{ */
{
    zval *zv = zend_ast_get_zval(ast);
    if (Z_TYPE_P(zv) == IS_LONG) {
        if (Z_LVAL_P(zv) == 0) {
            ZVAL_NEW_STR(zv, ZSTR_INIT_LITERAL("-0", 0));
        } else {
            ZEND_ASSERT(Z_LVAL_P(zv) > 0);
            Z_LVAL_P(zv) *= -1;
        }
    } else if (Z_TYPE_P(zv) == IS_STRING) {
        size_t orig_len = Z_STRLEN_P(zv);
        Z_STR_P(zv) = zend_string_extend(Z_STR_P(zv), orig_len + 1, 0);
        memmove(Z_STRVAL_P(zv) + 1, Z_STRVAL_P(zv), orig_len + 1);
        Z_STRVAL_P(zv)[0] = '-';
    } else {
        ZEND_UNREACHABLE();
    }
    return ast;
}
/* }}} */
 
static void zend_verify_namespace(void) /* {{{ */
{
    if (FC(has_bracketed_namespaces) && !FC(in_namespace)) {
        zend_error_noreturn(E_COMPILE_ERROR, "No code may exist outside of namespace {}");
    }
}
/* }}} */
 
/* {{{ zend_dirname
   Returns directory name component of path */
ZEND_API size_t zend_dirname(char *path, size_t len)
{
    char *end = path + len - 1;
    unsigned int len_adjust = 0;
 
#ifdef ZEND_WIN32
    /* Note that on Win32 CWD is per drive (heritage from CP/M).
     * This means dirname("c:foo") maps to "c:." or "c:" - which means CWD on C: drive.
     */
    if ((2 <= len) && isalpha((int)((unsigned char *)path)[0]) && (':' == path[1])) {
        /* Skip over the drive spec (if any) so as not to change */
        path += 2;
        len_adjust += 2;
        if (2 == len) {
            /* Return "c:" on Win32 for dirname("c:").
             * It would be more consistent to return "c:."
             * but that would require making the string *longer*.
             */
            return len;
        }
    }
#endif
 
    if (len == 0) {
        /* Illegal use of this function */
        return 0;
    }
 
    /* Strip trailing slashes */
    while (end >= path && IS_SLASH_P_EX(end, end == path)) {
        end--;
    }
    if (end < path) {
        /* The path only contained slashes */
        path[0] = DEFAULT_SLASH;
        path[1] = '\0';
        return 1 + len_adjust;
    }
 
    /* Strip filename */
    while (end >= path && !IS_SLASH_P_EX(end, end == path)) {
        end--;
    }
    if (end < path) {
        /* No slash found, therefore return '.' */
        path[0] = '.';
        path[1] = '\0';
        return 1 + len_adjust;
    }
 
    /* Strip slashes which came before the file name */
    while (end >= path && IS_SLASH_P_EX(end, end == path)) {
        end--;
    }
    if (end < path) {
        path[0] = DEFAULT_SLASH;
        path[1] = '\0';
        return 1 + len_adjust;
    }
    *(end+1) = '\0';
 
    return (size_t)(end + 1 - path) + len_adjust;
}
/* }}} */
 
static void zend_adjust_for_fetch_type(zend_op *opline, znode *result, uint32_t type) /* {{{ */
{
    uint_fast8_t factor = (opline->opcode == ZEND_FETCH_STATIC_PROP_R) ? 1 : 3;
 
    switch (type) {
        case BP_VAR_R:
            opline->result_type = IS_TMP_VAR;
            result->op_type = IS_TMP_VAR;
            return;
        case BP_VAR_W:
            opline->opcode += 1 * factor;
            return;
        case BP_VAR_RW:
            opline->opcode += 2 * factor;
            return;
        case BP_VAR_IS:
            opline->result_type = IS_TMP_VAR;
            result->op_type = IS_TMP_VAR;
            opline->opcode += 3 * factor;
            return;
        case BP_VAR_FUNC_ARG:
            opline->opcode += 4 * factor;
            return;
        case BP_VAR_UNSET:
            opline->opcode += 5 * factor;
            return;
        EMPTY_SWITCH_DEFAULT_CASE()
    }
}
/* }}} */
 
static inline void zend_make_var_result(znode *result, zend_op *opline) /* {{{ */
{
    opline->result_type = IS_VAR;
    opline->result.var = get_temporary_variable();
    GET_NODE(result, opline->result);
}
/* }}} */
 
static inline void zend_make_tmp_result(znode *result, zend_op *opline) /* {{{ */
{
    opline->result_type = IS_TMP_VAR;
    opline->result.var = get_temporary_variable();
    GET_NODE(result, opline->result);
}
/* }}} */
 
static zend_op *zend_emit_op(znode *result, uint8_t opcode, znode *op1, znode *op2) /* {{{ */
{
    zend_op *opline = get_next_op();
    opline->opcode = opcode;
 
    if (op1 != NULL) {
        SET_NODE(opline->op1, op1);
    }
 
    if (op2 != NULL) {
        SET_NODE(opline->op2, op2);
    }
 
    if (result) {
        zend_make_var_result(result, opline);
    }
    return opline;
}
/* }}} */
 
static zend_op *zend_emit_op_tmp(znode *result, uint8_t opcode, znode *op1, znode *op2) /* {{{ */
{
    zend_op *opline = get_next_op();
    opline->opcode = opcode;
 
    if (op1 != NULL) {
        SET_NODE(opline->op1, op1);
    }
 
    if (op2 != NULL) {
        SET_NODE(opline->op2, op2);
    }
 
    if (result) {
        zend_make_tmp_result(result, opline);
    }
 
    return opline;
}
/* }}} */
 
static void zend_emit_tick(void) /* {{{ */
{
    zend_op *opline;
 
    /* This prevents a double TICK generated by the parser statement of "declare()" */
    if (CG(active_op_array)->last && CG(active_op_array)->opcodes[CG(active_op_array)->last - 1].opcode == ZEND_TICKS) {
        return;
    }
 
    opline = get_next_op();
 
    opline->opcode = ZEND_TICKS;
    opline->extended_value = FC(declarables).ticks;
}
/* }}} */
 
static inline zend_op *zend_emit_op_data(znode *value) /* {{{ */
{
    return zend_emit_op(NULL, ZEND_OP_DATA, value, NULL);
}
/* }}} */
 
static inline uint32_t zend_emit_jump(uint32_t opnum_target) /* {{{ */
{
    uint32_t opnum = get_next_op_number();
    zend_op *opline = zend_emit_op(NULL, ZEND_JMP, NULL, NULL);
    opline->op1.opline_num = opnum_target;
    return opnum;
}
/* }}} */
 
ZEND_API bool zend_is_smart_branch(const zend_op *opline) /* {{{ */
{
    switch (opline->opcode) {
        case ZEND_IS_IDENTICAL:
        case ZEND_IS_NOT_IDENTICAL:
        case ZEND_IS_EQUAL:
        case ZEND_IS_NOT_EQUAL:
        case ZEND_IS_SMALLER:
        case ZEND_IS_SMALLER_OR_EQUAL:
        case ZEND_CASE:
        case ZEND_CASE_STRICT:
        case ZEND_ISSET_ISEMPTY_CV:
        case ZEND_ISSET_ISEMPTY_VAR:
        case ZEND_ISSET_ISEMPTY_DIM_OBJ:
        case ZEND_ISSET_ISEMPTY_PROP_OBJ:
        case ZEND_ISSET_ISEMPTY_STATIC_PROP:
        case ZEND_INSTANCEOF:
        case ZEND_TYPE_CHECK:
        case ZEND_DEFINED:
        case ZEND_IN_ARRAY:
        case ZEND_ARRAY_KEY_EXISTS:
            return 1;
        default:
            return 0;
    }
}
/* }}} */
 
static inline uint32_t zend_emit_cond_jump(uint8_t opcode, znode *cond, uint32_t opnum_target) /* {{{ */
{
    uint32_t opnum = get_next_op_number();
    zend_op *opline;
 
    if (cond->op_type == IS_TMP_VAR && opnum > 0) {
        opline = CG(active_op_array)->opcodes + opnum - 1;
        if (opline->result_type == IS_TMP_VAR
         && opline->result.var == cond->u.op.var
         && zend_is_smart_branch(opline)) {
            if (opcode == ZEND_JMPZ) {
                opline->result_type = IS_TMP_VAR | IS_SMART_BRANCH_JMPZ;
            } else {
                ZEND_ASSERT(opcode == ZEND_JMPNZ);
                opline->result_type = IS_TMP_VAR | IS_SMART_BRANCH_JMPNZ;
            }
        }
    }
    opline = zend_emit_op(NULL, opcode, cond, NULL);
    opline->op2.opline_num = opnum_target;
    return opnum;
}
/* }}} */
 
static inline void zend_update_jump_target(uint32_t opnum_jump, uint32_t opnum_target) /* {{{ */
{
    zend_op *opline = &CG(active_op_array)->opcodes[opnum_jump];
    switch (opline->opcode) {
        case ZEND_JMP:
            opline->op1.opline_num = opnum_target;
            break;
        case ZEND_JMPZ:
        case ZEND_JMPNZ:
        case ZEND_JMPZ_EX:
        case ZEND_JMPNZ_EX:
        case ZEND_JMP_SET:
        case ZEND_COALESCE:
        case ZEND_JMP_NULL:
        case ZEND_BIND_INIT_STATIC_OR_JMP:
        case ZEND_JMP_FRAMELESS:
            opline->op2.opline_num = opnum_target;
            break;
        EMPTY_SWITCH_DEFAULT_CASE()
    }
}
/* }}} */
 
static inline void zend_update_jump_target_to_next(uint32_t opnum_jump) /* {{{ */
{
    zend_update_jump_target(opnum_jump, get_next_op_number());
}
/* }}} */
 
static inline zend_op *zend_delayed_emit_op(znode *result, uint8_t opcode, znode *op1, znode *op2) /* {{{ */
{
    zend_op tmp_opline;
 
    init_op(&tmp_opline);
 
    tmp_opline.opcode = opcode;
    if (op1 != NULL) {
        SET_NODE(tmp_opline.op1, op1);
    }
    if (op2 != NULL) {
        SET_NODE(tmp_opline.op2, op2);
    }
    if (result) {
        zend_make_var_result(result, &tmp_opline);
    }
 
    zend_stack_push(&CG(delayed_oplines_stack), &tmp_opline);
    return zend_stack_top(&CG(delayed_oplines_stack));
}
/* }}} */
 
static inline uint32_t zend_delayed_compile_begin(void) /* {{{ */
{
    return zend_stack_count(&CG(delayed_oplines_stack));
}
/* }}} */
 
static zend_op *zend_delayed_compile_end(uint32_t offset) /* {{{ */
{
    zend_op *opline = NULL, *oplines = zend_stack_base(&CG(delayed_oplines_stack));
    uint32_t i, count = zend_stack_count(&CG(delayed_oplines_stack));
 
    ZEND_ASSERT(count >= offset);
    for (i = offset; i < count; ++i) {
        if (EXPECTED(oplines[i].opcode != ZEND_NOP)) {
            opline = get_next_op();
            memcpy(opline, &oplines[i], sizeof(zend_op));
        } else {
            opline = CG(active_op_array)->opcodes + oplines[i].extended_value;
        }
    }
 
    CG(delayed_oplines_stack).top = offset;
    return opline;
}
/* }}} */
 
static bool zend_ast_kind_is_short_circuited(zend_ast_kind ast_kind)
{
    switch (ast_kind) {
        case ZEND_AST_DIM:
        case ZEND_AST_PROP:
        case ZEND_AST_NULLSAFE_PROP:
        case ZEND_AST_STATIC_PROP:
        case ZEND_AST_METHOD_CALL:
        case ZEND_AST_NULLSAFE_METHOD_CALL:
        case ZEND_AST_STATIC_CALL:
            return 1;
        default:
            return 0;
    }
}
 
static bool zend_ast_is_short_circuited(const zend_ast *ast)
{
    switch (ast->kind) {
        case ZEND_AST_DIM:
        case ZEND_AST_PROP:
        case ZEND_AST_STATIC_PROP:
        case ZEND_AST_METHOD_CALL:
        case ZEND_AST_STATIC_CALL:
            return zend_ast_is_short_circuited(ast->child[0]);
        case ZEND_AST_NULLSAFE_PROP:
        case ZEND_AST_NULLSAFE_METHOD_CALL:
            return 1;
        default:
            return 0;
    }
}
 
static void zend_assert_not_short_circuited(const zend_ast *ast)
{
    if (zend_ast_is_short_circuited(ast)) {
        zend_error_noreturn(E_COMPILE_ERROR, "Cannot take reference of a nullsafe chain");
    }
}
 
/* Mark nodes that are an inner part of a short-circuiting chain.
 * We should not perform a "commit" on them, as it will be performed by the outer-most node.
 * We do this to avoid passing down an argument in various compile functions. */
 
#define ZEND_SHORT_CIRCUITING_INNER 0x8000
 
static void zend_short_circuiting_mark_inner(zend_ast *ast) {
    if (zend_ast_kind_is_short_circuited(ast->kind)) {
        ast->attr |= ZEND_SHORT_CIRCUITING_INNER;
    }
}
 
static uint32_t zend_short_circuiting_checkpoint(void)
{
    return zend_stack_count(&CG(short_circuiting_opnums));
}
 
static void zend_short_circuiting_commit(uint32_t checkpoint, znode *result, zend_ast *ast)
{
    bool is_short_circuited = zend_ast_kind_is_short_circuited(ast->kind)
        || ast->kind == ZEND_AST_ISSET || ast->kind == ZEND_AST_EMPTY;
    if (!is_short_circuited) {
        ZEND_ASSERT(zend_stack_count(&CG(short_circuiting_opnums)) == checkpoint
            && "Short circuiting stack should be empty");
        return;
    }
 
    if (ast->attr & ZEND_SHORT_CIRCUITING_INNER) {
        /* Outer-most node will commit. */
        return;
    }
 
    while (zend_stack_count(&CG(short_circuiting_opnums)) != checkpoint) {
        uint32_t opnum = *(uint32_t *) zend_stack_top(&CG(short_circuiting_opnums));
        zend_op *opline = &CG(active_op_array)->opcodes[opnum];
        opline->op2.opline_num = get_next_op_number();
        SET_NODE(opline->result, result);
        opline->extended_value |=
            ast->kind == ZEND_AST_ISSET ? ZEND_SHORT_CIRCUITING_CHAIN_ISSET :
            ast->kind == ZEND_AST_EMPTY ? ZEND_SHORT_CIRCUITING_CHAIN_EMPTY :
                                          ZEND_SHORT_CIRCUITING_CHAIN_EXPR;
        zend_stack_del_top(&CG(short_circuiting_opnums));
    }
}
 
static void zend_emit_jmp_null(znode *obj_node, uint32_t bp_type)
{
    uint32_t jmp_null_opnum = get_next_op_number();
    zend_op *opline = zend_emit_op(NULL, ZEND_JMP_NULL, obj_node, NULL);
    if (opline->op1_type == IS_CONST) {
        Z_TRY_ADDREF_P(CT_CONSTANT(opline->op1));
    }
    if (bp_type == BP_VAR_IS) {
        opline->extended_value |= ZEND_JMP_NULL_BP_VAR_IS;
    }
    zend_stack_push(&CG(short_circuiting_opnums), &jmp_null_opnum);
}
 
static void zend_compile_memoized_expr(znode *result, zend_ast *expr) /* {{{ */
{
    const zend_memoize_mode memoize_mode = CG(memoize_mode);
    if (memoize_mode == ZEND_MEMOIZE_COMPILE) {
        znode memoized_result;
 
        /* Go through normal compilation */
        CG(memoize_mode) = ZEND_MEMOIZE_NONE;
        zend_compile_expr(result, expr);
        CG(memoize_mode) = ZEND_MEMOIZE_COMPILE;
 
        if (result->op_type == IS_VAR) {
            zend_emit_op(&memoized_result, ZEND_COPY_TMP, result, NULL);
        } else if (result->op_type == IS_TMP_VAR) {
            zend_emit_op_tmp(&memoized_result, ZEND_COPY_TMP, result, NULL);
        } else {
            if (result->op_type == IS_CONST) {
                Z_TRY_ADDREF(result->u.constant);
            }
            memoized_result = *result;
        }
 
        zend_hash_index_update_mem(
            CG(memoized_exprs), (uintptr_t) expr, &memoized_result, sizeof(znode));
    } else if (memoize_mode == ZEND_MEMOIZE_FETCH) {
        znode *memoized_result = zend_hash_index_find_ptr(CG(memoized_exprs), (uintptr_t) expr);
        *result = *memoized_result;
        if (result->op_type == IS_CONST) {
            Z_TRY_ADDREF(result->u.constant);
        }
    } else {
        ZEND_UNREACHABLE();
    }
}
/* }}} */
 
/* Remember to update type_num_classes() in compact_literals.c when changing this function */
static size_t zend_type_get_num_classes(zend_type type) {
    if (!ZEND_TYPE_IS_COMPLEX(type)) {
        return 0;
    }
    if (ZEND_TYPE_HAS_LIST(type)) {
        /* Intersection types cannot have nested list types */
        if (ZEND_TYPE_IS_INTERSECTION(type)) {
            return ZEND_TYPE_LIST(type)->num_types;
        }
        ZEND_ASSERT(ZEND_TYPE_IS_UNION(type));
        size_t count = 0;
        zend_type *list_type;
 
        ZEND_TYPE_LIST_FOREACH(ZEND_TYPE_LIST(type), list_type) {
            if (ZEND_TYPE_IS_INTERSECTION(*list_type)) {
                count += ZEND_TYPE_LIST(*list_type)->num_types;
            } else {
                ZEND_ASSERT(!ZEND_TYPE_HAS_LIST(*list_type));
                count += 1;
            }
        } ZEND_TYPE_LIST_FOREACH_END();
        return count;
    }
    return 1;
}
 
static void zend_emit_return_type_check(
        znode *expr, zend_arg_info *return_info, bool implicit) /* {{{ */
{
    zend_type type = return_info->type;
    if (ZEND_TYPE_IS_SET(type)) {
        zend_op *opline;
 
        /* `return ...;` is illegal in a void function (but `return;` isn't) */
        if (ZEND_TYPE_CONTAINS_CODE(type, IS_VOID)) {
            if (expr) {
                if (expr->op_type == IS_CONST && Z_TYPE(expr->u.constant) == IS_NULL) {
                    zend_error_noreturn(E_COMPILE_ERROR,
                        "A void %s must not return a value "
                        "(did you mean \"return;\" instead of \"return null;\"?)",
                        CG(active_class_entry) != NULL ? "method" : "function");
                } else {
                    zend_error_noreturn(E_COMPILE_ERROR, "A void %s must not return a value",
                    CG(active_class_entry) != NULL ? "method" : "function");
                }
            }
            /* we don't need run-time check */
            return;
        }
 
        /* `return` is illegal in a never-returning function */
        if (ZEND_TYPE_CONTAINS_CODE(type, IS_NEVER)) {
            /* Implicit case handled separately using VERIFY_NEVER_TYPE opcode. */
            ZEND_ASSERT(!implicit);
            zend_error_noreturn(E_COMPILE_ERROR, "A never-returning %s must not return",
                CG(active_class_entry) != NULL ? "method" : "function");
            return;
        }
 
        if (!expr && !implicit) {
            if (ZEND_TYPE_ALLOW_NULL(type)) {
                zend_error_noreturn(E_COMPILE_ERROR,
                    "A %s with return type must return a value "
                    "(did you mean \"return null;\" instead of \"return;\"?)",
                    CG(active_class_entry) != NULL ? "method" : "function");
            } else {
                zend_error_noreturn(E_COMPILE_ERROR,
                    "A %s with return type must return a value",
                    CG(active_class_entry) != NULL ? "method" : "function");
            }
        }
 
        if (expr && ZEND_TYPE_PURE_MASK(type) == MAY_BE_ANY) {
            /* we don't need run-time check for mixed return type */
            return;
        }
 
        if (expr && expr->op_type == IS_CONST && ZEND_TYPE_CONTAINS_CODE(type, Z_TYPE(expr->u.constant))) {
            /* we don't need run-time check */
            return;
        }
 
        opline = zend_emit_op(NULL, ZEND_VERIFY_RETURN_TYPE, expr, NULL);
        if (expr && expr->op_type == IS_CONST) {
            opline->result_type = expr->op_type = IS_TMP_VAR;
            opline->result.var = expr->u.op.var = get_temporary_variable();
        }
 
        opline->op2.num = zend_alloc_cache_slots(zend_type_get_num_classes(return_info->type));
    }
}
/* }}} */
 
void zend_emit_final_return(bool return_one) /* {{{ */
{
    znode zn;
    zend_op *ret;
    bool returns_reference = (CG(active_op_array)->fn_flags & ZEND_ACC_RETURN_REFERENCE) != 0;
 
    if ((CG(active_op_array)->fn_flags & ZEND_ACC_HAS_RETURN_TYPE)
            && !(CG(active_op_array)->fn_flags & ZEND_ACC_GENERATOR)) {
        zend_arg_info *return_info = CG(active_op_array)->arg_info - 1;
 
        if (ZEND_TYPE_CONTAINS_CODE(return_info->type, IS_NEVER)) {
            zend_emit_op(NULL, ZEND_VERIFY_NEVER_TYPE, NULL, NULL);
            return;
        }
 
        zend_emit_return_type_check(NULL, return_info, 1);
    }
 
    zn.op_type = IS_CONST;
    if (return_one) {
        ZVAL_LONG(&zn.u.constant, 1);
    } else {
        ZVAL_NULL(&zn.u.constant);
    }
 
    ret = zend_emit_op(NULL, returns_reference ? ZEND_RETURN_BY_REF : ZEND_RETURN, &zn, NULL);
    ret->extended_value = -1;
}
/* }}} */
 
static inline bool zend_is_variable(zend_ast *ast) /* {{{ */
{
    return ast->kind == ZEND_AST_VAR
        || ast->kind == ZEND_AST_DIM
        || ast->kind == ZEND_AST_PROP
        || ast->kind == ZEND_AST_NULLSAFE_PROP
        || ast->kind == ZEND_AST_STATIC_PROP;
}
/* }}} */
 
static inline bool zend_is_call(zend_ast *ast) /* {{{ */
{
    return ast->kind == ZEND_AST_CALL
        || ast->kind == ZEND_AST_METHOD_CALL
        || ast->kind == ZEND_AST_NULLSAFE_METHOD_CALL
        || ast->kind == ZEND_AST_STATIC_CALL;
}
/* }}} */
 
static inline bool zend_is_variable_or_call(zend_ast *ast) /* {{{ */
{
    return zend_is_variable(ast) || zend_is_call(ast);
}
/* }}} */
 
static inline bool zend_is_unticked_stmt(zend_ast *ast) /* {{{ */
{
    return ast->kind == ZEND_AST_STMT_LIST || ast->kind == ZEND_AST_LABEL
        || ast->kind == ZEND_AST_PROP_DECL || ast->kind == ZEND_AST_CLASS_CONST_GROUP
        || ast->kind == ZEND_AST_USE_TRAIT || ast->kind == ZEND_AST_METHOD;
}
/* }}} */
 
static inline bool zend_can_write_to_variable(zend_ast *ast) /* {{{ */
{
    while (
        ast->kind == ZEND_AST_DIM
        || ast->kind == ZEND_AST_PROP
    ) {
        ast = ast->child[0];
    }
 
    return zend_is_variable_or_call(ast) && !zend_ast_is_short_circuited(ast);
}
/* }}} */
 
static inline bool zend_is_const_default_class_ref(zend_ast *name_ast) /* {{{ */
{
    if (name_ast->kind != ZEND_AST_ZVAL) {
        return 0;
    }
 
    return ZEND_FETCH_CLASS_DEFAULT == zend_get_class_fetch_type_ast(name_ast);
}
/* }}} */
 
static inline void zend_handle_numeric_op(znode *node) /* {{{ */
{
    if (node->op_type == IS_CONST && Z_TYPE(node->u.constant) == IS_STRING) {
        zend_ulong index;
 
        if (ZEND_HANDLE_NUMERIC(Z_STR(node->u.constant), index)) {
            zval_ptr_dtor(&node->u.constant);
            ZVAL_LONG(&node->u.constant, index);
        }
    }
}
/* }}} */
 
static inline void zend_handle_numeric_dim(zend_op *opline, znode *dim_node) /* {{{ */
{
    if (Z_TYPE(dim_node->u.constant) == IS_STRING) {
        zend_ulong index;
 
        if (ZEND_HANDLE_NUMERIC(Z_STR(dim_node->u.constant), index)) {
            /* For numeric indexes we also keep the original value to use by ArrayAccess
             * See bug #63217
             */
            int c = zend_add_literal(&dim_node->u.constant);
            ZEND_ASSERT(opline->op2.constant + 1 == c);
            ZVAL_LONG(CT_CONSTANT(opline->op2), index);
            Z_EXTRA_P(CT_CONSTANT(opline->op2)) = ZEND_EXTRA_VALUE;
            return;
        }
    }
}
/* }}} */
 
static inline void zend_set_class_name_op1(zend_op *opline, znode *class_node) /* {{{ */
{
    if (class_node->op_type == IS_CONST) {
        opline->op1_type = IS_CONST;
        opline->op1.constant = zend_add_class_name_literal(
            Z_STR(class_node->u.constant));
    } else {
        SET_NODE(opline->op1, class_node);
    }
}
/* }}} */
 
static void zend_compile_class_ref(znode *result, zend_ast *name_ast, uint32_t fetch_flags) /* {{{ */
{
    uint32_t fetch_type;
 
    if (name_ast->kind != ZEND_AST_ZVAL) {
        znode name_node;
 
        zend_compile_expr(&name_node, name_ast);
 
        if (name_node.op_type == IS_CONST) {
            zend_string *name;
 
            if (Z_TYPE(name_node.u.constant) != IS_STRING) {
                zend_error_noreturn(E_COMPILE_ERROR, "Illegal class name");
            }
 
            name = Z_STR(name_node.u.constant);
            fetch_type = zend_get_class_fetch_type(name);
 
            if (fetch_type == ZEND_FETCH_CLASS_DEFAULT) {
                result->op_type = IS_CONST;
                ZVAL_STR(&result->u.constant, zend_resolve_class_name(name, ZEND_NAME_FQ));
            } else {
                zend_ensure_valid_class_fetch_type(fetch_type);
                result->op_type = IS_UNUSED;
                result->u.op.num = fetch_type | fetch_flags;
            }
 
            zend_string_release_ex(name, 0);
        } else {
            zend_op *opline = zend_emit_op(result, ZEND_FETCH_CLASS, NULL, &name_node);
            opline->op1.num = ZEND_FETCH_CLASS_DEFAULT | fetch_flags;
        }
        return;
    }
 
    /* Fully qualified names are always default refs */
    if (name_ast->attr == ZEND_NAME_FQ) {
        result->op_type = IS_CONST;
        ZVAL_STR(&result->u.constant, zend_resolve_class_name_ast(name_ast));
        return;
    }
 
    fetch_type = zend_get_class_fetch_type(zend_ast_get_str(name_ast));
    if (ZEND_FETCH_CLASS_DEFAULT == fetch_type) {
        result->op_type = IS_CONST;
        ZVAL_STR(&result->u.constant, zend_resolve_class_name_ast(name_ast));
    } else {
        zend_ensure_valid_class_fetch_type(fetch_type);
        result->op_type = IS_UNUSED;
        result->u.op.num = fetch_type | fetch_flags;
    }
}
/* }}} */
 
static zend_result zend_try_compile_cv(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *name_ast = ast->child[0];
    if (name_ast->kind == ZEND_AST_ZVAL) {
        zval *zv = zend_ast_get_zval(name_ast);
        zend_string *name;
 
        if (EXPECTED(Z_TYPE_P(zv) == IS_STRING)) {
            name = zval_make_interned_string(zv);
        } else {
            name = zend_new_interned_string(zval_get_string_func(zv));
        }
 
        if (zend_is_auto_global(name)) {
            return FAILURE;
        }
 
        result->op_type = IS_CV;
        result->u.op.var = lookup_cv(name);
 
        if (UNEXPECTED(Z_TYPE_P(zv) != IS_STRING)) {
            zend_string_release_ex(name, 0);
        }
 
        return SUCCESS;
    }
 
    return FAILURE;
}
/* }}} */
 
static zend_op *zend_compile_simple_var_no_cv(znode *result, zend_ast *ast, uint32_t type, bool delayed) /* {{{ */
{
    zend_ast *name_ast = ast->child[0];
    znode name_node;
    zend_op *opline;
 
    zend_compile_expr(&name_node, name_ast);
    if (name_node.op_type == IS_CONST) {
        convert_to_string(&name_node.u.constant);
    }
 
    if (delayed) {
        opline = zend_delayed_emit_op(result, ZEND_FETCH_R, &name_node, NULL);
    } else {
        opline = zend_emit_op(result, ZEND_FETCH_R, &name_node, NULL);
    }
 
    if (name_node.op_type == IS_CONST &&
        zend_is_auto_global(Z_STR(name_node.u.constant))) {
 
        opline->extended_value = ZEND_FETCH_GLOBAL;
    } else {
        opline->extended_value = ZEND_FETCH_LOCAL;
    }
 
    zend_adjust_for_fetch_type(opline, result, type);
    return opline;
}
/* }}} */
 
static bool is_this_fetch(zend_ast *ast) /* {{{ */
{
    if (ast->kind == ZEND_AST_VAR && ast->child[0]->kind == ZEND_AST_ZVAL) {
        zval *name = zend_ast_get_zval(ast->child[0]);
        return Z_TYPE_P(name) == IS_STRING && zend_string_equals(Z_STR_P(name), ZSTR_KNOWN(ZEND_STR_THIS));
    }
 
    return 0;
}
/* }}} */
 
static bool is_globals_fetch(const zend_ast *ast)
{
    if (ast->kind == ZEND_AST_VAR && ast->child[0]->kind == ZEND_AST_ZVAL) {
        zval *name = zend_ast_get_zval(ast->child[0]);
        return Z_TYPE_P(name) == IS_STRING && zend_string_equals_literal(Z_STR_P(name), "GLOBALS");
    }
 
    return 0;
}
 
static bool is_global_var_fetch(zend_ast *ast)
{
    return ast->kind == ZEND_AST_DIM && is_globals_fetch(ast->child[0]);
}
 
static bool this_guaranteed_exists(void) /* {{{ */
{
    zend_oparray_context *ctx = &CG(context);
    while (ctx) {
        /* Instance methods always have a $this.
         * This also includes closures that have a scope and use $this. */
        zend_op_array *op_array = ctx->op_array;
        if (op_array->fn_flags & ZEND_ACC_STATIC) {
            return false;
        } else if (op_array->scope) {
            return true;
        } else if (!(op_array->fn_flags & ZEND_ACC_CLOSURE)) {
            return false;
        }
        ctx = ctx->prev;
    }
    return false;
}
/* }}} */
 
static zend_op *zend_compile_simple_var(znode *result, zend_ast *ast, uint32_t type, bool delayed) /* {{{ */
{
    if (is_this_fetch(ast)) {
        zend_op *opline = zend_emit_op(result, ZEND_FETCH_THIS, NULL, NULL);
        if ((type == BP_VAR_R) || (type == BP_VAR_IS)) {
            opline->result_type = IS_TMP_VAR;
            result->op_type = IS_TMP_VAR;
        }
        CG(active_op_array)->fn_flags |= ZEND_ACC_USES_THIS;
        return opline;
    } else if (is_globals_fetch(ast)) {
        zend_op *opline = zend_emit_op(result, ZEND_FETCH_GLOBALS, NULL, NULL);
        if (type == BP_VAR_R || type == BP_VAR_IS) {
            opline->result_type = IS_TMP_VAR;
            result->op_type = IS_TMP_VAR;
        }
        return opline;
    } else if (zend_try_compile_cv(result, ast) == FAILURE) {
        return zend_compile_simple_var_no_cv(result, ast, type, delayed);
    }
    return NULL;
}
/* }}} */
 
static void zend_separate_if_call_and_write(znode *node, zend_ast *ast, uint32_t type) /* {{{ */
{
    if (type != BP_VAR_R
     && type != BP_VAR_IS
     /* Whether a FUNC_ARG is R may only be determined at runtime. */
     && type != BP_VAR_FUNC_ARG
     && zend_is_call(ast)) {
        if (node->op_type == IS_VAR) {
            zend_op *opline = zend_emit_op(NULL, ZEND_SEPARATE, node, NULL);
            opline->result_type = IS_VAR;
            opline->result.var = opline->op1.var;
        } else {
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot use result of built-in function in write context");
        }
    }
}
/* }}} */
 
static inline void zend_emit_assign_znode(zend_ast *var_ast, znode *value_node) /* {{{ */
{
    znode dummy_node;
    zend_ast *assign_ast = zend_ast_create(ZEND_AST_ASSIGN, var_ast,
        zend_ast_create_znode(value_node));
    zend_compile_expr(&dummy_node, assign_ast);
    zend_do_free(&dummy_node);
}
/* }}} */
 
static zend_op *zend_delayed_compile_dim(znode *result, zend_ast *ast, uint32_t type, bool by_ref)
{
    zend_ast *var_ast = ast->child[0];
    zend_ast *dim_ast = ast->child[1];
    zend_op *opline;
 
    znode var_node, dim_node;
 
    if (is_globals_fetch(var_ast)) {
        if (dim_ast == NULL) {
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot append to $GLOBALS");
        }
 
        zend_compile_expr(&dim_node, dim_ast);
        if (dim_node.op_type == IS_CONST) {
            convert_to_string(&dim_node.u.constant);
        }
 
        opline = zend_delayed_emit_op(result, ZEND_FETCH_R, &dim_node, NULL);
        opline->extended_value = ZEND_FETCH_GLOBAL;
        zend_adjust_for_fetch_type(opline, result, type);
        return opline;
    } else {
        zend_short_circuiting_mark_inner(var_ast);
        opline = zend_delayed_compile_var(&var_node, var_ast, type, 0);
        if (opline) {
            if (type == BP_VAR_W && (opline->opcode == ZEND_FETCH_STATIC_PROP_W || opline->opcode == ZEND_FETCH_OBJ_W)) {
                opline->extended_value |= ZEND_FETCH_DIM_WRITE;
            } else if (opline->opcode == ZEND_FETCH_DIM_W
                    || opline->opcode == ZEND_FETCH_DIM_RW
                    || opline->opcode == ZEND_FETCH_DIM_FUNC_ARG
                    || opline->opcode == ZEND_FETCH_DIM_UNSET) {
                opline->extended_value = ZEND_FETCH_DIM_DIM;
            }
        }
    }
 
    zend_separate_if_call_and_write(&var_node, var_ast, type);
 
    if (dim_ast == NULL) {
        if (type == BP_VAR_R || type == BP_VAR_IS) {
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot use [] for reading");
        }
        if (type == BP_VAR_UNSET) {
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot use [] for unsetting");
        }
        dim_node.op_type = IS_UNUSED;
    } else {
        zend_compile_expr(&dim_node, dim_ast);
    }
 
    opline = zend_delayed_emit_op(result, ZEND_FETCH_DIM_R, &var_node, &dim_node);
    zend_adjust_for_fetch_type(opline, result, type);
    if (by_ref) {
        opline->extended_value = ZEND_FETCH_DIM_REF;
    }
 
    if (dim_node.op_type == IS_CONST) {
        zend_handle_numeric_dim(opline, &dim_node);
    }
    return opline;
}
 
static zend_op *zend_compile_dim(znode *result, zend_ast *ast, uint32_t type, bool by_ref) /* {{{ */
{
    uint32_t offset = zend_delayed_compile_begin();
    zend_delayed_compile_dim(result, ast, type, by_ref);
    return zend_delayed_compile_end(offset);
}
/* }}} */
 
static zend_op *zend_delayed_compile_prop(znode *result, zend_ast *ast, uint32_t type) /* {{{ */
{
    zend_ast *obj_ast = ast->child[0];
    zend_ast *prop_ast = ast->child[1];
 
    znode obj_node, prop_node;
    zend_op *opline;
    bool nullsafe = ast->kind == ZEND_AST_NULLSAFE_PROP;
 
    if (is_this_fetch(obj_ast)) {
        if (this_guaranteed_exists()) {
            obj_node.op_type = IS_UNUSED;
        } else {
            zend_emit_op(&obj_node, ZEND_FETCH_THIS, NULL, NULL);
        }
        CG(active_op_array)->fn_flags |= ZEND_ACC_USES_THIS;
 
        /* We will throw if $this doesn't exist, so there's no need to emit a JMP_NULL
         * check for a nullsafe access. */
    } else {
        zend_short_circuiting_mark_inner(obj_ast);
        opline = zend_delayed_compile_var(&obj_node, obj_ast, type, 0);
        if (opline && (opline->opcode == ZEND_FETCH_DIM_W
                || opline->opcode == ZEND_FETCH_DIM_RW
                || opline->opcode == ZEND_FETCH_DIM_FUNC_ARG
                || opline->opcode == ZEND_FETCH_DIM_UNSET)) {
            opline->extended_value = ZEND_FETCH_DIM_OBJ;
        }
 
        zend_separate_if_call_and_write(&obj_node, obj_ast, type);
        if (nullsafe) {
            if (obj_node.op_type == IS_TMP_VAR) {
                /* Flush delayed oplines */
                zend_op *opline = NULL, *oplines = zend_stack_base(&CG(delayed_oplines_stack));
                uint32_t var = obj_node.u.op.var;
                uint32_t count = zend_stack_count(&CG(delayed_oplines_stack));
                uint32_t i = count;
 
                while (i > 0 && oplines[i-1].result_type == IS_TMP_VAR && oplines[i-1].result.var == var) {
                    i--;
                    if (oplines[i].op1_type == IS_TMP_VAR) {
                        var = oplines[i].op1.var;
                    } else {
                        break;
                    }
                }
                for (; i < count; ++i) {
                    if (oplines[i].opcode != ZEND_NOP) {
                        opline = get_next_op();
                        memcpy(opline, &oplines[i], sizeof(zend_op));
                        oplines[i].opcode = ZEND_NOP;
                        oplines[i].extended_value = opline - CG(active_op_array)->opcodes;
                    }
                }
            }
            zend_emit_jmp_null(&obj_node, type);
        }
    }
 
    zend_compile_expr(&prop_node, prop_ast);
 
    opline = zend_delayed_emit_op(result, ZEND_FETCH_OBJ_R, &obj_node, &prop_node);
    if (opline->op2_type == IS_CONST) {
        convert_to_string(CT_CONSTANT(opline->op2));
        zend_string_hash_val(Z_STR_P(CT_CONSTANT(opline->op2)));
        opline->extended_value = zend_alloc_cache_slots(3);
    }
 
    zend_adjust_for_fetch_type(opline, result, type);
 
    return opline;
}
/* }}} */
 
static zend_op *zend_compile_prop(znode *result, zend_ast *ast, uint32_t type, bool by_ref) /* {{{ */
{
    uint32_t offset = zend_delayed_compile_begin();
    zend_op *opline = zend_delayed_compile_prop(result, ast, type);
    if (by_ref) { /* shared with cache_slot */
        opline->extended_value |= ZEND_FETCH_REF;
    }
    return zend_delayed_compile_end(offset);
}
/* }}} */
 
static zend_op *zend_compile_static_prop(znode *result, zend_ast *ast, uint32_t type, bool by_ref, bool delayed) /* {{{ */
{
    zend_ast *class_ast = ast->child[0];
    zend_ast *prop_ast = ast->child[1];
 
    znode class_node, prop_node;
    zend_op *opline;
 
    zend_short_circuiting_mark_inner(class_ast);
    zend_compile_class_ref(&class_node, class_ast, ZEND_FETCH_CLASS_EXCEPTION);
 
    zend_compile_expr(&prop_node, prop_ast);
 
    if (delayed) {
        opline = zend_delayed_emit_op(result, ZEND_FETCH_STATIC_PROP_R, &prop_node, NULL);
    } else {
        opline = zend_emit_op(result, ZEND_FETCH_STATIC_PROP_R, &prop_node, NULL);
    }
    if (opline->op1_type == IS_CONST) {
        convert_to_string(CT_CONSTANT(opline->op1));
        opline->extended_value = zend_alloc_cache_slots(3);
    }
    if (class_node.op_type == IS_CONST) {
        opline->op2_type = IS_CONST;
        opline->op2.constant = zend_add_class_name_literal(
            Z_STR(class_node.u.constant));
        if (opline->op1_type != IS_CONST) {
            opline->extended_value = zend_alloc_cache_slot();
        }
    } else {
        SET_NODE(opline->op2, &class_node);
    }
 
    if (by_ref && (type == BP_VAR_W || type == BP_VAR_FUNC_ARG)) { /* shared with cache_slot */
        opline->extended_value |= ZEND_FETCH_REF;
    }
 
    zend_adjust_for_fetch_type(opline, result, type);
    return opline;
}
/* }}} */
 
static void zend_verify_list_assign_target(zend_ast *var_ast, zend_ast_attr array_style) /* {{{ */ {
    if (var_ast->kind == ZEND_AST_ARRAY) {
        if (var_ast->attr == ZEND_ARRAY_SYNTAX_LONG) {
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot assign to array(), use [] instead");
        }
        if (array_style != var_ast->attr) {
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot mix [] and list()");
        }
    } else if (!zend_can_write_to_variable(var_ast)) {
        zend_error_noreturn(E_COMPILE_ERROR, "Assignments can only happen to writable values");
    }
}
/* }}} */
 
static inline void zend_emit_assign_ref_znode(zend_ast *var_ast, znode *value_node);
 
/* Propagate refs used on leaf elements to the surrounding list() structures. */
static bool zend_propagate_list_refs(zend_ast *ast) { /* {{{ */
    zend_ast_list *list = zend_ast_get_list(ast);
    bool has_refs = 0;
    uint32_t i;
 
    for (i = 0; i < list->children; ++i) {
        zend_ast *elem_ast = list->child[i];
 
        if (elem_ast) {
            zend_ast *var_ast = elem_ast->child[0];
            if (var_ast->kind == ZEND_AST_ARRAY) {
                elem_ast->attr = zend_propagate_list_refs(var_ast);
            }
            has_refs |= elem_ast->attr;
        }
    }
 
    return has_refs;
}
/* }}} */
 
static bool list_is_keyed(zend_ast_list *list)
{
    for (uint32_t i = 0; i < list->children; i++) {
        zend_ast *child = list->child[i];
        if (child) {
            return child->kind == ZEND_AST_ARRAY_ELEM && child->child[1] != NULL;
        }
    }
    return false;
}
 
static void zend_compile_list_assign(
        znode *result, zend_ast *ast, znode *expr_node, zend_ast_attr array_style) /* {{{ */
{
    zend_ast_list *list = zend_ast_get_list(ast);
    uint32_t i;
    bool has_elems = 0;
    bool is_keyed = list_is_keyed(list);
 
    if (list->children && expr_node->op_type == IS_CONST && Z_TYPE(expr_node->u.constant) == IS_STRING) {
        zval_make_interned_string(&expr_node->u.constant);
    }
 
    for (i = 0; i < list->children; ++i) {
        zend_ast *elem_ast = list->child[i];
        zend_ast *var_ast, *key_ast;
        znode fetch_result, dim_node;
        zend_op *opline;
 
        if (elem_ast == NULL) {
            if (is_keyed) {
                zend_error(E_COMPILE_ERROR,
                    "Cannot use empty array entries in keyed array assignment");
            } else {
                continue;
            }
        }
 
        if (elem_ast->kind == ZEND_AST_UNPACK) {
            zend_error(E_COMPILE_ERROR,
                    "Spread operator is not supported in assignments");
        }
 
        var_ast = elem_ast->child[0];
        key_ast = elem_ast->child[1];
        has_elems = 1;
 
        if (is_keyed) {
            if (key_ast == NULL) {
                zend_error(E_COMPILE_ERROR,
                    "Cannot mix keyed and unkeyed array entries in assignments");
            }
 
            zend_compile_expr(&dim_node, key_ast);
        } else {
            if (key_ast != NULL) {
                zend_error(E_COMPILE_ERROR,
                    "Cannot mix keyed and unkeyed array entries in assignments");
            }
 
            dim_node.op_type = IS_CONST;
            ZVAL_LONG(&dim_node.u.constant, i);
        }
 
        if (expr_node->op_type == IS_CONST) {
            Z_TRY_ADDREF(expr_node->u.constant);
        }
 
        zend_verify_list_assign_target(var_ast, array_style);
 
        opline = zend_emit_op(&fetch_result,
            elem_ast->attr ? (expr_node->op_type == IS_CV ? ZEND_FETCH_DIM_W : ZEND_FETCH_LIST_W) : ZEND_FETCH_LIST_R, expr_node, &dim_node);
 
        if (dim_node.op_type == IS_CONST) {
            zend_handle_numeric_dim(opline, &dim_node);
        }
 
        if (elem_ast->attr) {
            zend_emit_op(&fetch_result, ZEND_MAKE_REF, &fetch_result, NULL);
        }
        if (var_ast->kind == ZEND_AST_ARRAY) {
            zend_compile_list_assign(NULL, var_ast, &fetch_result, var_ast->attr);
        } else if (elem_ast->attr) {
            zend_emit_assign_ref_znode(var_ast, &fetch_result);
        } else {
            zend_emit_assign_znode(var_ast, &fetch_result);
        }
    }
 
    if (has_elems == 0) {
        zend_error_noreturn(E_COMPILE_ERROR, "Cannot use empty list");
    }
 
    if (result) {
        *result = *expr_node;
    } else {
        zend_do_free(expr_node);
    }
}
/* }}} */
 
static void zend_ensure_writable_variable(const zend_ast *ast) /* {{{ */
{
    if (ast->kind == ZEND_AST_CALL) {
        zend_error_noreturn(E_COMPILE_ERROR, "Can't use function return value in write context");
    }
    if (
        ast->kind == ZEND_AST_METHOD_CALL
        || ast->kind == ZEND_AST_NULLSAFE_METHOD_CALL
        || ast->kind == ZEND_AST_STATIC_CALL
    ) {
        zend_error_noreturn(E_COMPILE_ERROR, "Can't use method return value in write context");
    }
    if (zend_ast_is_short_circuited(ast)) {
        zend_error_noreturn(E_COMPILE_ERROR, "Can't use nullsafe operator in write context");
    }
    if (is_globals_fetch(ast)) {
        zend_error_noreturn(E_COMPILE_ERROR,
            "$GLOBALS can only be modified using the $GLOBALS[$name] = $value syntax");
    }
}
/* }}} */
 
/* Detects $a... = $a pattern */
static bool zend_is_assign_to_self(zend_ast *var_ast, zend_ast *expr_ast) /* {{{ */
{
    if (expr_ast->kind != ZEND_AST_VAR || expr_ast->child[0]->kind != ZEND_AST_ZVAL) {
        return 0;
    }
 
    while (zend_is_variable(var_ast) && var_ast->kind != ZEND_AST_VAR) {
        var_ast = var_ast->child[0];
    }
 
    if (var_ast->kind != ZEND_AST_VAR || var_ast->child[0]->kind != ZEND_AST_ZVAL) {
        return 0;
    }
 
    {
        zend_string *name1 = zval_get_string(zend_ast_get_zval(var_ast->child[0]));
        zend_string *name2 = zval_get_string(zend_ast_get_zval(expr_ast->child[0]));
        bool result = zend_string_equals(name1, name2);
        zend_string_release_ex(name1, 0);
        zend_string_release_ex(name2, 0);
        return result;
    }
}
/* }}} */
 
static void zend_compile_expr_with_potential_assign_to_self(
        znode *expr_node, zend_ast *expr_ast, zend_ast *var_ast) {
    if (zend_is_assign_to_self(var_ast, expr_ast) && !is_this_fetch(expr_ast)) {
        /* $a[0] = $a should evaluate the right $a first */
        znode cv_node;
 
        if (zend_try_compile_cv(&cv_node, expr_ast) == FAILURE) {
            zend_compile_simple_var_no_cv(expr_node, expr_ast, BP_VAR_R, 0);
        } else {
            zend_emit_op_tmp(expr_node, ZEND_QM_ASSIGN, &cv_node, NULL);
        }
    } else {
        zend_compile_expr(expr_node, expr_ast);
    }
}
 
static void zend_compile_assign(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *var_ast = ast->child[0];
    zend_ast *expr_ast = ast->child[1];
 
    znode var_node, expr_node;
    zend_op *opline;
    uint32_t offset;
    if (is_this_fetch(var_ast)) {
        zend_error_noreturn(E_COMPILE_ERROR, "Cannot re-assign $this");
    }
 
    zend_ensure_writable_variable(var_ast);
 
    /* Treat $GLOBALS['x'] assignment like assignment to variable. */
    zend_ast_kind kind = is_global_var_fetch(var_ast) ? ZEND_AST_VAR : var_ast->kind;
    switch (kind) {
        case ZEND_AST_VAR:
            offset = zend_delayed_compile_begin();
            zend_delayed_compile_var(&var_node, var_ast, BP_VAR_W, 0);
            zend_compile_expr(&expr_node, expr_ast);
            zend_delayed_compile_end(offset);
            CG(zend_lineno) = zend_ast_get_lineno(var_ast);
            zend_emit_op_tmp(result, ZEND_ASSIGN, &var_node, &expr_node);
            return;
        case ZEND_AST_STATIC_PROP:
            offset = zend_delayed_compile_begin();
            zend_delayed_compile_var(result, var_ast, BP_VAR_W, 0);
            zend_compile_expr(&expr_node, expr_ast);
 
            opline = zend_delayed_compile_end(offset);
            opline->opcode = ZEND_ASSIGN_STATIC_PROP;
            opline->result_type = IS_TMP_VAR;
            result->op_type = IS_TMP_VAR;
 
            zend_emit_op_data(&expr_node);
            return;
        case ZEND_AST_DIM:
            offset = zend_delayed_compile_begin();
            zend_delayed_compile_dim(result, var_ast, BP_VAR_W, /* by_ref */ false);
            zend_compile_expr_with_potential_assign_to_self(&expr_node, expr_ast, var_ast);
 
            opline = zend_delayed_compile_end(offset);
            opline->opcode = ZEND_ASSIGN_DIM;
            opline->result_type = IS_TMP_VAR;
            result->op_type = IS_TMP_VAR;
 
            opline = zend_emit_op_data(&expr_node);
            return;
        case ZEND_AST_PROP:
        case ZEND_AST_NULLSAFE_PROP:
            offset = zend_delayed_compile_begin();
            zend_delayed_compile_prop(result, var_ast, BP_VAR_W);
            zend_compile_expr(&expr_node, expr_ast);
 
            opline = zend_delayed_compile_end(offset);
            opline->opcode = ZEND_ASSIGN_OBJ;
            opline->result_type = IS_TMP_VAR;
            result->op_type = IS_TMP_VAR;
 
            zend_emit_op_data(&expr_node);
            return;
        case ZEND_AST_ARRAY:
            if (zend_propagate_list_refs(var_ast)) {
                if (!zend_is_variable_or_call(expr_ast)) {
                    zend_error_noreturn(E_COMPILE_ERROR,
                        "Cannot assign reference to non referenceable value");
                } else {
                    zend_assert_not_short_circuited(expr_ast);
                }
 
                zend_compile_var(&expr_node, expr_ast, BP_VAR_W, 1);
                /* MAKE_REF is usually not necessary for CVs. However, if there are
                 * self-assignments, this forces the RHS to evaluate first. */
                zend_emit_op(&expr_node, ZEND_MAKE_REF, &expr_node, NULL);
            } else {
                if (expr_ast->kind == ZEND_AST_VAR) {
                    /* list($a, $b) = $a should evaluate the right $a first */
                    znode cv_node;
 
                    if (zend_try_compile_cv(&cv_node, expr_ast) == FAILURE) {
                        zend_compile_simple_var_no_cv(&expr_node, expr_ast, BP_VAR_R, 0);
                    } else {
                        zend_emit_op_tmp(&expr_node, ZEND_QM_ASSIGN, &cv_node, NULL);
                    }
                } else {
                    zend_compile_expr(&expr_node, expr_ast);
                }
            }
 
            zend_compile_list_assign(result, var_ast, &expr_node, var_ast->attr);
            return;
        EMPTY_SWITCH_DEFAULT_CASE();
    }
}
/* }}} */
 
static void zend_compile_assign_ref(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *target_ast = ast->child[0];
    zend_ast *source_ast = ast->child[1];
 
    znode target_node, source_node;
    zend_op *opline;
    uint32_t offset, flags;
 
    if (is_this_fetch(target_ast)) {
        zend_error_noreturn(E_COMPILE_ERROR, "Cannot re-assign $this");
    }
    zend_ensure_writable_variable(target_ast);
    zend_assert_not_short_circuited(source_ast);
    if (is_globals_fetch(source_ast)) {
        zend_error_noreturn(E_COMPILE_ERROR, "Cannot acquire reference to $GLOBALS");
    }
 
    offset = zend_delayed_compile_begin();
    zend_delayed_compile_var(&target_node, target_ast, BP_VAR_W, 1);
    zend_compile_var(&source_node, source_ast, BP_VAR_W, 1);
 
    if ((target_ast->kind != ZEND_AST_VAR
      || target_ast->child[0]->kind != ZEND_AST_ZVAL)
     && source_ast->kind != ZEND_AST_ZNODE
     && source_node.op_type != IS_CV) {
        /* Both LHS and RHS expressions may modify the same data structure,
         * and the modification during RHS evaluation may dangle the pointer
         * to the result of the LHS evaluation.
         * Use MAKE_REF instruction to replace direct pointer with REFERENCE.
         * See: Bug #71539
         */
        zend_emit_op(&source_node, ZEND_MAKE_REF, &source_node, NULL);
    }
 
    opline = zend_delayed_compile_end(offset);
 
    if (source_node.op_type != IS_VAR && zend_is_call(source_ast)) {
        zend_error_noreturn(E_COMPILE_ERROR, "Cannot use result of built-in function in write context");
    }
 
    flags = zend_is_call(source_ast) ? ZEND_RETURNS_FUNCTION : 0;
 
    if (opline && opline->opcode == ZEND_FETCH_OBJ_W) {
        opline->opcode = ZEND_ASSIGN_OBJ_REF;
        opline->extended_value &= ~ZEND_FETCH_REF;
        opline->extended_value |= flags;
        zend_emit_op_data(&source_node);
        *result = target_node;
    } else if (opline && opline->opcode == ZEND_FETCH_STATIC_PROP_W) {
        opline->opcode = ZEND_ASSIGN_STATIC_PROP_REF;
        opline->extended_value &= ~ZEND_FETCH_REF;
        opline->extended_value |= flags;
        zend_emit_op_data(&source_node);
        *result = target_node;
    } else {
        opline = zend_emit_op(result, ZEND_ASSIGN_REF, &target_node, &source_node);
        opline->extended_value = flags;
    }
}
/* }}} */
 
static inline void zend_emit_assign_ref_znode(zend_ast *var_ast, znode *value_node) /* {{{ */
{
    znode dummy_node;
    zend_ast *assign_ast = zend_ast_create(ZEND_AST_ASSIGN_REF, var_ast,
        zend_ast_create_znode(value_node));
    zend_compile_expr(&dummy_node, assign_ast);
    zend_do_free(&dummy_node);
}
/* }}} */
 
static void zend_compile_compound_assign(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *var_ast = ast->child[0];
    zend_ast *expr_ast = ast->child[1];
    uint32_t opcode = ast->attr;
 
    znode var_node, expr_node;
    zend_op *opline;
    uint32_t offset, cache_slot;
 
    zend_ensure_writable_variable(var_ast);
 
    /* Treat $GLOBALS['x'] assignment like assignment to variable. */
    zend_ast_kind kind = is_global_var_fetch(var_ast) ? ZEND_AST_VAR : var_ast->kind;
    switch (kind) {
        case ZEND_AST_VAR:
            offset = zend_delayed_compile_begin();
            zend_delayed_compile_var(&var_node, var_ast, BP_VAR_RW, 0);
            zend_compile_expr(&expr_node, expr_ast);
            zend_delayed_compile_end(offset);
            opline = zend_emit_op_tmp(result, ZEND_ASSIGN_OP, &var_node, &expr_node);
            opline->extended_value = opcode;
            return;
        case ZEND_AST_STATIC_PROP:
            offset = zend_delayed_compile_begin();
            zend_delayed_compile_var(result, var_ast, BP_VAR_RW, 0);
            zend_compile_expr(&expr_node, expr_ast);
 
            opline = zend_delayed_compile_end(offset);
            cache_slot = opline->extended_value;
            opline->opcode = ZEND_ASSIGN_STATIC_PROP_OP;
            opline->extended_value = opcode;
            opline->result_type = IS_TMP_VAR;
            result->op_type = IS_TMP_VAR;
 
            opline = zend_emit_op_data(&expr_node);
            opline->extended_value = cache_slot;
            return;
        case ZEND_AST_DIM:
            offset = zend_delayed_compile_begin();
            zend_delayed_compile_dim(result, var_ast, BP_VAR_RW, /* by_ref */ false);
            zend_compile_expr_with_potential_assign_to_self(&expr_node, expr_ast, var_ast);
 
            opline = zend_delayed_compile_end(offset);
            opline->opcode = ZEND_ASSIGN_DIM_OP;
            opline->extended_value = opcode;
            opline->result_type = IS_TMP_VAR;
            result->op_type = IS_TMP_VAR;
 
            zend_emit_op_data(&expr_node);
            return;
        case ZEND_AST_PROP:
        case ZEND_AST_NULLSAFE_PROP:
            offset = zend_delayed_compile_begin();
            zend_delayed_compile_prop(result, var_ast, BP_VAR_RW);
            zend_compile_expr(&expr_node, expr_ast);
 
            opline = zend_delayed_compile_end(offset);
            cache_slot = opline->extended_value;
            opline->opcode = ZEND_ASSIGN_OBJ_OP;
            opline->extended_value = opcode;
            opline->result_type = IS_TMP_VAR;
            result->op_type = IS_TMP_VAR;
 
            opline = zend_emit_op_data(&expr_node);
            opline->extended_value = cache_slot;
            return;
        EMPTY_SWITCH_DEFAULT_CASE()
    }
}
/* }}} */
 
static uint32_t zend_get_arg_num(zend_function *fn, zend_string *arg_name) {
    // TODO: Caching?
    if (fn->type == ZEND_USER_FUNCTION) {
        for (uint32_t i = 0; i < fn->common.num_args; i++) {
            zend_arg_info *arg_info = &fn->op_array.arg_info[i];
            if (zend_string_equals(arg_info->name, arg_name)) {
                return i + 1;
            }
        }
    } else {
        for (uint32_t i = 0; i < fn->common.num_args; i++) {
            zend_internal_arg_info *arg_info = &fn->internal_function.arg_info[i];
            size_t len = strlen(arg_info->name);
            if (zend_string_equals_cstr(arg_name, arg_info->name, len)) {
                return i + 1;
            }
        }
    }
 
    /* Either an invalid argument name, or collected into a variadic argument. */
    return (uint32_t) -1;
}
 
static uint32_t zend_compile_args(
        zend_ast *ast, zend_function *fbc, bool *may_have_extra_named_args) /* {{{ */
{
    zend_ast_list *args = zend_ast_get_list(ast);
    uint32_t i;
    bool uses_arg_unpack = 0;
    uint32_t arg_count = 0; /* number of arguments not including unpacks */
 
    /* Whether named arguments are used syntactically, to enforce language level limitations.
     * May not actually use named argument passing. */
    bool uses_named_args = 0;
    /* Whether there may be any undef arguments due to the use of named arguments. */
    bool may_have_undef = 0;
    /* Whether there may be any extra named arguments collected into a variadic. */
    *may_have_extra_named_args = 0;
 
    for (i = 0; i < args->children; ++i) {
        zend_ast *arg = args->child[i];
        zend_string *arg_name = NULL;
        uint32_t arg_num = i + 1;
 
        znode arg_node;
        zend_op *opline;
        uint8_t opcode;
 
        if (arg->kind == ZEND_AST_UNPACK) {
            if (uses_named_args) {
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Cannot use argument unpacking after named arguments");
            }
 
            /* Unpack may contain named arguments. */
            may_have_undef = 1;
            if (!fbc || (fbc->common.fn_flags & ZEND_ACC_VARIADIC)) {
                *may_have_extra_named_args = 1;
            }
 
            uses_arg_unpack = 1;
            fbc = NULL;
 
            zend_compile_expr(&arg_node, arg->child[0]);
            opline = zend_emit_op(NULL, ZEND_SEND_UNPACK, &arg_node, NULL);
            opline->op2.num = arg_count;
            opline->result.var = EX_NUM_TO_VAR(arg_count - 1);
 
            continue;
        }
 
        if (arg->kind == ZEND_AST_NAMED_ARG) {
            uses_named_args = 1;
            arg_name = zval_make_interned_string(zend_ast_get_zval(arg->child[0]));
            arg = arg->child[1];
 
            if (fbc && !uses_arg_unpack) {
                arg_num = zend_get_arg_num(fbc, arg_name);
                if (arg_num == arg_count + 1 && !may_have_undef) {
                    /* Using named arguments, but passing in order. */
                    arg_name = NULL;
                    arg_count++;
                } else {
                    // TODO: We could track which arguments were passed, even if out of order.
                    may_have_undef = 1;
                    if (arg_num == (uint32_t) -1 && (fbc->common.fn_flags & ZEND_ACC_VARIADIC)) {
                        *may_have_extra_named_args = 1;
                    }
                }
            } else {
                arg_num = (uint32_t) -1;
                may_have_undef = 1;
                *may_have_extra_named_args = 1;
            }
        } else {
            if (uses_arg_unpack) {
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Cannot use positional argument after argument unpacking");
            }
 
            if (uses_named_args) {
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Cannot use positional argument after named argument");
            }
 
            arg_count++;
        }
 
        /* Treat passing of $GLOBALS the same as passing a call.
         * This will error at runtime if the argument is by-ref. */
        if (zend_is_call(arg) || is_globals_fetch(arg)) {
            zend_compile_var(&arg_node, arg, BP_VAR_R, 0);
            if (arg_node.op_type & (IS_CONST|IS_TMP_VAR)) {
                /* Function call was converted into builtin instruction */
                if (!fbc || ARG_MUST_BE_SENT_BY_REF(fbc, arg_num)) {
                    opcode = ZEND_SEND_VAL_EX;
                } else {
                    opcode = ZEND_SEND_VAL;
                }
            } else {
                if (fbc && arg_num != (uint32_t) -1) {
                    if (ARG_MUST_BE_SENT_BY_REF(fbc, arg_num)) {
                        opcode = ZEND_SEND_VAR_NO_REF;
                    } else if (ARG_MAY_BE_SENT_BY_REF(fbc, arg_num)) {
                        /* For IS_VAR operands, SEND_VAL will pass through the operand without
                         * dereferencing, so it will use a by-ref pass if the call returned by-ref
                         * and a by-value pass if it returned by-value. */
                        opcode = ZEND_SEND_VAL;
                    } else {
                        opcode = ZEND_SEND_VAR;
                    }
                } else {
                    opcode = ZEND_SEND_VAR_NO_REF_EX;
                }
            }
        } else if (zend_is_variable(arg) && !zend_ast_is_short_circuited(arg)) {
            if (fbc && arg_num != (uint32_t) -1) {
                if (ARG_SHOULD_BE_SENT_BY_REF(fbc, arg_num)) {
                    zend_compile_var(&arg_node, arg, BP_VAR_W, 1);
                    opcode = ZEND_SEND_REF;
                } else {
                    zend_compile_var(&arg_node, arg, BP_VAR_R, 0);
                    opcode = (arg_node.op_type == IS_TMP_VAR) ? ZEND_SEND_VAL : ZEND_SEND_VAR;
                }
            } else {
                do {
                    if (arg->kind == ZEND_AST_VAR) {
                        CG(zend_lineno) = zend_ast_get_lineno(ast);
                        if (is_this_fetch(arg)) {
                            zend_emit_op(&arg_node, ZEND_FETCH_THIS, NULL, NULL);
                            opcode = ZEND_SEND_VAR_EX;
                            CG(active_op_array)->fn_flags |= ZEND_ACC_USES_THIS;
                            break;
                        } else if (zend_try_compile_cv(&arg_node, arg) == SUCCESS) {
                            opcode = ZEND_SEND_VAR_EX;
                            break;
                        }
                    }
                    opline = zend_emit_op(NULL, ZEND_CHECK_FUNC_ARG, NULL, NULL);
                    if (arg_name) {
                        opline->op2_type = IS_CONST;
                        zend_string_addref(arg_name);
                        opline->op2.constant = zend_add_literal_string(&arg_name);
                        opline->result.num = zend_alloc_cache_slots(2);
                    } else {
                        opline->op2.num = arg_num;
                    }
                    zend_compile_var(&arg_node, arg, BP_VAR_FUNC_ARG, 1);
                    opcode = ZEND_SEND_FUNC_ARG;
                } while (0);
            }
        } else {
            zend_compile_expr(&arg_node, arg);
            if (arg_node.op_type == IS_VAR) {
                /* pass ++$a or something similar */
                if (fbc && arg_num != (uint32_t) -1) {
                    if (ARG_MUST_BE_SENT_BY_REF(fbc, arg_num)) {
                        opcode = ZEND_SEND_VAR_NO_REF;
                    } else if (ARG_MAY_BE_SENT_BY_REF(fbc, arg_num)) {
                        opcode = ZEND_SEND_VAL;
                    } else {
                        opcode = ZEND_SEND_VAR;
                    }
                } else {
                    opcode = ZEND_SEND_VAR_NO_REF_EX;
                }
            } else if (arg_node.op_type == IS_CV) {
                if (fbc && arg_num != (uint32_t) -1) {
                    if (ARG_SHOULD_BE_SENT_BY_REF(fbc, arg_num)) {
                        opcode = ZEND_SEND_REF;
                    } else {
                        opcode = ZEND_SEND_VAR;
                    }
                } else {
                    opcode = ZEND_SEND_VAR_EX;
                }
            } else {
                /* Delay "Only variables can be passed by reference" error to execution */
                if (fbc && arg_num != (uint32_t) -1 && !ARG_MUST_BE_SENT_BY_REF(fbc, arg_num)) {
                    opcode = ZEND_SEND_VAL;
                } else {
                    opcode = ZEND_SEND_VAL_EX;
                }
            }
        }
 
        opline = zend_emit_op(NULL, opcode, &arg_node, NULL);
        if (arg_name) {
            opline->op2_type = IS_CONST;
            zend_string_addref(arg_name);
            opline->op2.constant = zend_add_literal_string(&arg_name);
            opline->result.num = zend_alloc_cache_slots(2);
        } else {
            opline->op2.opline_num = arg_num;
            opline->result.var = EX_NUM_TO_VAR(arg_num - 1);
        }
    }
 
    if (may_have_undef) {
        zend_emit_op(NULL, ZEND_CHECK_UNDEF_ARGS, NULL, NULL);
    }
 
    return arg_count;
}
/* }}} */
 
ZEND_API uint8_t zend_get_call_op(const zend_op *init_op, zend_function *fbc) /* {{{ */
{
    if (fbc) {
        ZEND_ASSERT(!(fbc->common.fn_flags & ZEND_ACC_CALL_VIA_TRAMPOLINE));
        if (fbc->type == ZEND_INTERNAL_FUNCTION && !(CG(compiler_options) & ZEND_COMPILE_IGNORE_INTERNAL_FUNCTIONS)) {
            if (init_op->opcode == ZEND_INIT_FCALL && !zend_execute_internal) {
                if (!(fbc->common.fn_flags & ZEND_ACC_DEPRECATED)) {
                    return ZEND_DO_ICALL;
                } else {
                    return ZEND_DO_FCALL_BY_NAME;
                }
            }
        } else if (!(CG(compiler_options) & ZEND_COMPILE_IGNORE_USER_FUNCTIONS)){
            if (zend_execute_ex == execute_ex) {
                if (!(fbc->common.fn_flags & ZEND_ACC_DEPRECATED)) {
                    return ZEND_DO_UCALL;
                } else {
                    return ZEND_DO_FCALL_BY_NAME;
                }
            }
        }
    } else if (zend_execute_ex == execute_ex &&
               !zend_execute_internal &&
               (init_op->opcode == ZEND_INIT_FCALL_BY_NAME ||
                init_op->opcode == ZEND_INIT_NS_FCALL_BY_NAME)) {
        return ZEND_DO_FCALL_BY_NAME;
    }
    return ZEND_DO_FCALL;
}
/* }}} */
 
static bool zend_compile_call_common(znode *result, zend_ast *args_ast, zend_function *fbc, uint32_t lineno) /* {{{ */
{
    zend_op *opline;
    uint32_t opnum_init = get_next_op_number() - 1;
 
    if (args_ast->kind == ZEND_AST_CALLABLE_CONVERT) {
        opline = &CG(active_op_array)->opcodes[opnum_init];
        opline->extended_value = 0;
 
        if (opline->opcode == ZEND_NEW) {
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot create Closure for new expression");
        }
 
        if (opline->opcode == ZEND_INIT_FCALL) {
            opline->op1.num = zend_vm_calc_used_stack(0, fbc);
        }
 
        zend_emit_op_tmp(result, ZEND_CALLABLE_CONVERT, NULL, NULL);
        return true;
    }
 
    bool may_have_extra_named_args;
    uint32_t arg_count = zend_compile_args(args_ast, fbc, &may_have_extra_named_args);
 
    zend_do_extended_fcall_begin();
 
    opline = &CG(active_op_array)->opcodes[opnum_init];
    opline->extended_value = arg_count;
 
    if (opline->opcode == ZEND_INIT_FCALL) {
        opline->op1.num = zend_vm_calc_used_stack(arg_count, fbc);
    }
 
    opline = zend_emit_op(result, zend_get_call_op(opline, fbc), NULL, NULL);
    if (may_have_extra_named_args) {
        opline->extended_value = ZEND_FCALL_MAY_HAVE_EXTRA_NAMED_PARAMS;
    }
    opline->lineno = lineno;
    zend_do_extended_fcall_end();
    return false;
}
/* }}} */
 
static bool zend_compile_function_name(znode *name_node, zend_ast *name_ast) /* {{{ */
{
    zend_string *orig_name = zend_ast_get_str(name_ast);
    bool is_fully_qualified;
 
    name_node->op_type = IS_CONST;
    ZVAL_STR(&name_node->u.constant, zend_resolve_function_name(
        orig_name, name_ast->attr, &is_fully_qualified));
 
    return !is_fully_qualified && FC(current_namespace);
}
/* }}} */
 
static void zend_compile_dynamic_call(znode *result, znode *name_node, zend_ast *args_ast, uint32_t lineno) /* {{{ */
{
    if (name_node->op_type == IS_CONST && Z_TYPE(name_node->u.constant) == IS_STRING) {
        const char *colon;
        zend_string *str = Z_STR(name_node->u.constant);
        if ((colon = zend_memrchr(ZSTR_VAL(str), ':', ZSTR_LEN(str))) != NULL && colon > ZSTR_VAL(str) && *(colon - 1) == ':') {
            zend_string *class = zend_string_init(ZSTR_VAL(str), colon - ZSTR_VAL(str) - 1, 0);
            zend_string *method = zend_string_init(colon + 1, ZSTR_LEN(str) - (colon - ZSTR_VAL(str)) - 1, 0);
            zend_op *opline = get_next_op();
 
            opline->opcode = ZEND_INIT_STATIC_METHOD_CALL;
            opline->op1_type = IS_CONST;
            opline->op1.constant = zend_add_class_name_literal(class);
            opline->op2_type = IS_CONST;
            opline->op2.constant = zend_add_func_name_literal(method);
            /* 2 slots, for class and method */
            opline->result.num = zend_alloc_cache_slots(2);
            zval_ptr_dtor(&name_node->u.constant);
        } else {
            zend_op *opline = get_next_op();
 
            opline->opcode = ZEND_INIT_FCALL_BY_NAME;
            opline->op2_type = IS_CONST;
            opline->op2.constant = zend_add_func_name_literal(str);
            opline->result.num = zend_alloc_cache_slot();
        }
    } else {
        zend_emit_op(NULL, ZEND_INIT_DYNAMIC_CALL, NULL, name_node);
    }
 
    zend_compile_call_common(result, args_ast, NULL, lineno);
}
/* }}} */
 
static inline bool zend_args_contain_unpack_or_named(zend_ast_list *args) /* {{{ */
{
    uint32_t i;
    for (i = 0; i < args->children; ++i) {
        zend_ast *arg = args->child[i];
        if (arg->kind == ZEND_AST_UNPACK || arg->kind == ZEND_AST_NAMED_ARG) {
            return 1;
        }
    }
    return 0;
}
/* }}} */
 
static zend_result zend_compile_func_strlen(znode *result, zend_ast_list *args) /* {{{ */
{
    znode arg_node;
 
    if (args->children != 1) {
        return FAILURE;
    }
 
    zend_compile_expr(&arg_node, args->child[0]);
    if (arg_node.op_type == IS_CONST && Z_TYPE(arg_node.u.constant) == IS_STRING) {
        result->op_type = IS_CONST;
        ZVAL_LONG(&result->u.constant, Z_STRLEN(arg_node.u.constant));
        zval_ptr_dtor_str(&arg_node.u.constant);
    } else {
        zend_emit_op_tmp(result, ZEND_STRLEN, &arg_node, NULL);
    }
    return SUCCESS;
}
/* }}} */
 
static zend_result zend_compile_func_typecheck(znode *result, zend_ast_list *args, uint32_t type) /* {{{ */
{
    znode arg_node;
    zend_op *opline;
 
    if (args->children != 1) {
        return FAILURE;
    }
 
    zend_compile_expr(&arg_node, args->child[0]);
    opline = zend_emit_op_tmp(result, ZEND_TYPE_CHECK, &arg_node, NULL);
    if (type != _IS_BOOL) {
        opline->extended_value = (1 << type);
    } else {
        opline->extended_value = (1 << IS_FALSE) | (1 << IS_TRUE);
    }
    return SUCCESS;
}
/* }}} */
 
static zend_result zend_compile_func_is_scalar(znode *result, zend_ast_list *args) /* {{{ */
{
    znode arg_node;
    zend_op *opline;
 
    if (args->children != 1) {
        return FAILURE;
    }
 
    zend_compile_expr(&arg_node, args->child[0]);
    opline = zend_emit_op_tmp(result, ZEND_TYPE_CHECK, &arg_node, NULL);
    opline->extended_value = (1 << IS_FALSE | 1 << IS_TRUE | 1 << IS_DOUBLE | 1 << IS_LONG | 1 << IS_STRING);
    return SUCCESS;
}
 
static zend_result zend_compile_func_cast(znode *result, zend_ast_list *args, uint32_t type) /* {{{ */
{
    znode arg_node;
    zend_op *opline;
 
    if (args->children != 1) {
        return FAILURE;
    }
 
    zend_compile_expr(&arg_node, args->child[0]);
    if (type == _IS_BOOL) {
        opline = zend_emit_op_tmp(result, ZEND_BOOL, &arg_node, NULL);
    } else {
        opline = zend_emit_op_tmp(result, ZEND_CAST, &arg_node, NULL);
        opline->extended_value = type;
    }
    return SUCCESS;
}
/* }}} */
 
static zend_result zend_compile_func_defined(znode *result, zend_ast_list *args) /* {{{ */
{
    zend_string *name;
    zend_op *opline;
 
    if (args->children != 1 || args->child[0]->kind != ZEND_AST_ZVAL) {
        return FAILURE;
    }
 
    name = zval_get_string(zend_ast_get_zval(args->child[0]));
    if (zend_memrchr(ZSTR_VAL(name), '\\', ZSTR_LEN(name)) || zend_memrchr(ZSTR_VAL(name), ':', ZSTR_LEN(name))) {
        zend_string_release_ex(name, 0);
        return FAILURE;
    }
 
    if (zend_try_ct_eval_const(&result->u.constant, name, 0)) {
        zend_string_release_ex(name, 0);
        zval_ptr_dtor(&result->u.constant);
        ZVAL_TRUE(&result->u.constant);
        result->op_type = IS_CONST;
        return SUCCESS;
    }
 
    opline = zend_emit_op_tmp(result, ZEND_DEFINED, NULL, NULL);
    opline->op1_type = IS_CONST;
    LITERAL_STR(opline->op1, name);
    opline->extended_value = zend_alloc_cache_slot();
 
    return SUCCESS;
}
/* }}} */
 
static zend_result zend_compile_func_chr(znode *result, zend_ast_list *args) /* {{{ */
{
 
    if (args->children == 1 &&
        args->child[0]->kind == ZEND_AST_ZVAL &&
        Z_TYPE_P(zend_ast_get_zval(args->child[0])) == IS_LONG) {
 
        zend_long c = Z_LVAL_P(zend_ast_get_zval(args->child[0])) & 0xff;
 
        result->op_type = IS_CONST;
        ZVAL_CHAR(&result->u.constant, c);
        return SUCCESS;
    } else {
        return FAILURE;
    }
}
/* }}} */
 
static zend_result zend_compile_func_ord(znode *result, zend_ast_list *args) /* {{{ */
{
    if (args->children == 1 &&
        args->child[0]->kind == ZEND_AST_ZVAL &&
        Z_TYPE_P(zend_ast_get_zval(args->child[0])) == IS_STRING) {
 
        result->op_type = IS_CONST;
        ZVAL_LONG(&result->u.constant, (unsigned char)Z_STRVAL_P(zend_ast_get_zval(args->child[0]))[0]);
        return SUCCESS;
    } else {
        return FAILURE;
    }
}
/* }}} */
 
/* We can only calculate the stack size for functions that have been fully compiled, otherwise
 * additional CV or TMP slots may still be added. This prevents the use of INIT_FCALL for
 * directly or indirectly recursive function calls. */
static bool fbc_is_finalized(zend_function *fbc) {
    return !ZEND_USER_CODE(fbc->type) || (fbc->common.fn_flags & ZEND_ACC_DONE_PASS_TWO);
}
 
static bool zend_compile_ignore_class(zend_class_entry *ce, zend_string *filename)
{
    if (ce->type == ZEND_INTERNAL_CLASS) {
        return CG(compiler_options) & ZEND_COMPILE_IGNORE_INTERNAL_CLASSES;
    } else {
        return (CG(compiler_options) & ZEND_COMPILE_IGNORE_OTHER_FILES)
            && ce->info.user.filename != filename;
    }
}
 
static bool zend_compile_ignore_function(zend_function *fbc, zend_string *filename)
{
    if (fbc->type == ZEND_INTERNAL_FUNCTION) {
        return CG(compiler_options) & ZEND_COMPILE_IGNORE_INTERNAL_FUNCTIONS;
    } else {
        return (CG(compiler_options) & ZEND_COMPILE_IGNORE_USER_FUNCTIONS)
            || ((CG(compiler_options) & ZEND_COMPILE_IGNORE_OTHER_FILES)
                && fbc->op_array.filename != filename);
    }
}
 
static zend_result zend_try_compile_ct_bound_init_user_func(zend_ast *name_ast, uint32_t num_args) /* {{{ */
{
    zend_string *name, *lcname;
    zend_function *fbc;
    zend_op *opline;
 
    if (name_ast->kind != ZEND_AST_ZVAL || Z_TYPE_P(zend_ast_get_zval(name_ast)) != IS_STRING) {
        return FAILURE;
    }
 
    name = zend_ast_get_str(name_ast);
    lcname = zend_string_tolower(name);
 
    fbc = zend_hash_find_ptr(CG(function_table), lcname);
    if (!fbc
     || !fbc_is_finalized(fbc)
     || zend_compile_ignore_function(fbc, CG(active_op_array)->filename)) {
        zend_string_release_ex(lcname, 0);
        return FAILURE;
    }
 
    opline = zend_emit_op(NULL, ZEND_INIT_FCALL, NULL, NULL);
    opline->extended_value = num_args;
    opline->op1.num = zend_vm_calc_used_stack(num_args, fbc);
    opline->op2_type = IS_CONST;
    LITERAL_STR(opline->op2, lcname);
    opline->result.num = zend_alloc_cache_slot();
 
    return SUCCESS;
}
/* }}} */
 
static void zend_compile_init_user_func(zend_ast *name_ast, uint32_t num_args, zend_string *orig_func_name) /* {{{ */
{
    zend_op *opline;
    znode name_node;
 
    if (zend_try_compile_ct_bound_init_user_func(name_ast, num_args) == SUCCESS) {
        return;
    }
 
    zend_compile_expr(&name_node, name_ast);
 
    opline = zend_emit_op(NULL, ZEND_INIT_USER_CALL, NULL, &name_node);
    opline->op1_type = IS_CONST;
    LITERAL_STR(opline->op1, zend_string_copy(orig_func_name));
    opline->extended_value = num_args;
}
/* }}} */
 
/* cufa = call_user_func_array */
static zend_result zend_compile_func_cufa(znode *result, zend_ast_list *args, zend_string *lcname) /* {{{ */
{
    znode arg_node;
    zend_op *opline;
 
    if (args->children != 2) {
        return FAILURE;
    }
 
    zend_compile_init_user_func(args->child[0], 0, lcname);
    if (args->child[1]->kind == ZEND_AST_CALL
     && args->child[1]->child[0]->kind == ZEND_AST_ZVAL
     && Z_TYPE_P(zend_ast_get_zval(args->child[1]->child[0])) == IS_STRING
     && args->child[1]->child[1]->kind == ZEND_AST_ARG_LIST) {
        zend_string *orig_name = zend_ast_get_str(args->child[1]->child[0]);
        zend_ast_list *list = zend_ast_get_list(args->child[1]->child[1]);
        bool is_fully_qualified;
        zend_string *name = zend_resolve_function_name(orig_name, args->child[1]->child[0]->attr, &is_fully_qualified);
 
        if (zend_string_equals_literal_ci(name, "array_slice")
         && !zend_args_contain_unpack_or_named(list)
         && list->children == 3
         && list->child[1]->kind == ZEND_AST_ZVAL) {
            zval *zv = zend_ast_get_zval(list->child[1]);
 
            if (Z_TYPE_P(zv) == IS_LONG
             && Z_LVAL_P(zv) >= 0
             && Z_LVAL_P(zv) <= 0x7fffffff) {
                zend_op *opline;
                znode len_node;
 
                zend_compile_expr(&arg_node, list->child[0]);
                zend_compile_expr(&len_node, list->child[2]);
                opline = zend_emit_op(NULL, ZEND_SEND_ARRAY, &arg_node, &len_node);
                opline->extended_value = Z_LVAL_P(zv);
                zend_emit_op(result, ZEND_DO_FCALL, NULL, NULL);
                zend_string_release_ex(name, 0);
                return SUCCESS;
            }
        }
        zend_string_release_ex(name, 0);
    }
    zend_compile_expr(&arg_node, args->child[1]);
    zend_emit_op(NULL, ZEND_SEND_ARRAY, &arg_node, NULL);
    zend_emit_op(NULL, ZEND_CHECK_UNDEF_ARGS, NULL, NULL);
    opline = zend_emit_op(result, ZEND_DO_FCALL, NULL, NULL);
    opline->extended_value = ZEND_FCALL_MAY_HAVE_EXTRA_NAMED_PARAMS;
 
    return SUCCESS;
}
/* }}} */
 
/* cuf = call_user_func */
static zend_result zend_compile_func_cuf(znode *result, zend_ast_list *args, zend_string *lcname) /* {{{ */
{
    uint32_t i;
 
    if (args->children < 1) {
        return FAILURE;
    }
 
    zend_compile_init_user_func(args->child[0], args->children - 1, lcname);
    for (i = 1; i < args->children; ++i) {
        zend_ast *arg_ast = args->child[i];
        znode arg_node;
        zend_op *opline;
 
        zend_compile_expr(&arg_node, arg_ast);
 
        opline = zend_emit_op(NULL, ZEND_SEND_USER, &arg_node, NULL);
        opline->op2.num = i;
        opline->result.var = EX_NUM_TO_VAR(i - 1);
    }
    zend_emit_op(result, ZEND_DO_FCALL, NULL, NULL);
 
    return SUCCESS;
}
/* }}} */
 
static void zend_compile_assert(znode *result, zend_ast_list *args, zend_string *name, zend_function *fbc, uint32_t lineno) /* {{{ */
{
    if (EG(assertions) >= 0) {
        znode name_node;
        zend_op *opline;
        uint32_t check_op_number = get_next_op_number();
 
        zend_emit_op(NULL, ZEND_ASSERT_CHECK, NULL, NULL);
 
        if (fbc && fbc_is_finalized(fbc)) {
            name_node.op_type = IS_CONST;
            ZVAL_STR_COPY(&name_node.u.constant, name);
 
            opline = zend_emit_op(NULL, ZEND_INIT_FCALL, NULL, &name_node);
        } else {
            opline = zend_emit_op(NULL, ZEND_INIT_NS_FCALL_BY_NAME, NULL, NULL);
            opline->op2_type = IS_CONST;
            opline->op2.constant = zend_add_ns_func_name_literal(name);
        }
        opline->result.num = zend_alloc_cache_slot();
 
        if (args->children == 1) {
            /* add "assert(condition) as assertion message */
            zend_ast *arg = zend_ast_create_zval_from_str(
                zend_ast_export("assert(", args->child[0], ")"));
            if (args->child[0]->kind == ZEND_AST_NAMED_ARG) {
                /* If the original argument was named, add the new argument as named as well,
                 * as mixing named and positional is not allowed. */
                zend_ast *name = zend_ast_create_zval_from_str(
                    ZSTR_INIT_LITERAL("description", 0));
                arg = zend_ast_create(ZEND_AST_NAMED_ARG, name, arg);
            }
            zend_ast_list_add((zend_ast *) args, arg);
        }
 
        zend_compile_call_common(result, (zend_ast*)args, fbc, lineno);
 
        opline = &CG(active_op_array)->opcodes[check_op_number];
        opline->op2.opline_num = get_next_op_number();
        SET_NODE(opline->result, result);
    } else {
        if (!fbc) {
            zend_string_release_ex(name, 0);
        }
        result->op_type = IS_CONST;
        ZVAL_TRUE(&result->u.constant);
    }
}
/* }}} */
 
static zend_result zend_compile_func_in_array(znode *result, zend_ast_list *args) /* {{{ */
{
    bool strict = 0;
    znode array, needly;
    zend_op *opline;
 
    if (args->children == 3) {
        if (args->child[2]->kind == ZEND_AST_ZVAL) {
            strict = zend_is_true(zend_ast_get_zval(args->child[2]));
        } else if (args->child[2]->kind == ZEND_AST_CONST) {
            zval value;
            zend_ast *name_ast = args->child[2]->child[0];
            bool is_fully_qualified;
            zend_string *resolved_name = zend_resolve_const_name(
                zend_ast_get_str(name_ast), name_ast->attr, &is_fully_qualified);
 
            if (!zend_try_ct_eval_const(&value, resolved_name, is_fully_qualified)) {
                zend_string_release_ex(resolved_name, 0);
                return FAILURE;
            }
 
            zend_string_release_ex(resolved_name, 0);
            strict = zend_is_true(&value);
            zval_ptr_dtor(&value);
        } else {
            return FAILURE;
        }
    } else if (args->children != 2) {
        return FAILURE;
    }
 
    if (args->child[1]->kind != ZEND_AST_ARRAY
     || !zend_try_ct_eval_array(&array.u.constant, args->child[1])) {
        return FAILURE;
    }
 
    if (zend_hash_num_elements(Z_ARRVAL(array.u.constant)) > 0) {
        bool ok = 1;
        zval *val, tmp;
        HashTable *src = Z_ARRVAL(array.u.constant);
        HashTable *dst = zend_new_array(zend_hash_num_elements(src));
 
        ZVAL_TRUE(&tmp);
 
        if (strict) {
            ZEND_HASH_FOREACH_VAL(src, val) {
                if (Z_TYPE_P(val) == IS_STRING) {
                    zend_hash_add(dst, Z_STR_P(val), &tmp);
                } else if (Z_TYPE_P(val) == IS_LONG) {
                    zend_hash_index_add(dst, Z_LVAL_P(val), &tmp);
                } else {
                    zend_array_destroy(dst);
                    ok = 0;
                    break;
                }
            } ZEND_HASH_FOREACH_END();
        } else {
            ZEND_HASH_FOREACH_VAL(src, val) {
                if (Z_TYPE_P(val) != IS_STRING
                 || is_numeric_string(Z_STRVAL_P(val), Z_STRLEN_P(val), NULL, NULL, 0)) {
                    zend_array_destroy(dst);
                    ok = 0;
                    break;
                }
                zend_hash_add(dst, Z_STR_P(val), &tmp);
            } ZEND_HASH_FOREACH_END();
        }
 
        zend_array_destroy(src);
        if (!ok) {
            return FAILURE;
        }
        Z_ARRVAL(array.u.constant) = dst;
    }
    array.op_type = IS_CONST;
 
    zend_compile_expr(&needly, args->child[0]);
 
    opline = zend_emit_op_tmp(result, ZEND_IN_ARRAY, &needly, &array);
    opline->extended_value = strict;
 
    return SUCCESS;
}
/* }}} */
 
static zend_result zend_compile_func_count(znode *result, zend_ast_list *args, zend_string *lcname) /* {{{ */
{
    znode arg_node;
    zend_op *opline;
 
    if (args->children != 1) {
        return FAILURE;
    }
 
    zend_compile_expr(&arg_node, args->child[0]);
    opline = zend_emit_op_tmp(result, ZEND_COUNT, &arg_node, NULL);
    opline->extended_value = zend_string_equals_literal(lcname, "sizeof");
 
    return SUCCESS;
}
/* }}} */
 
static zend_result zend_compile_func_get_class(znode *result, zend_ast_list *args) /* {{{ */
{
    if (args->children == 0) {
        zend_emit_op_tmp(result, ZEND_GET_CLASS, NULL, NULL);
    } else {
        znode arg_node;
 
        if (args->children != 1) {
            return FAILURE;
        }
 
        zend_compile_expr(&arg_node, args->child[0]);
        zend_emit_op_tmp(result, ZEND_GET_CLASS, &arg_node, NULL);
    }
    return SUCCESS;
}
/* }}} */
 
static zend_result zend_compile_func_get_called_class(znode *result, zend_ast_list *args) /* {{{ */
{
    if (args->children != 0) {
        return FAILURE;
    }
 
    zend_emit_op_tmp(result, ZEND_GET_CALLED_CLASS, NULL, NULL);
    return SUCCESS;
}
/* }}} */
 
static zend_result zend_compile_func_gettype(znode *result, zend_ast_list *args) /* {{{ */
{
    znode arg_node;
 
    if (args->children != 1) {
        return FAILURE;
    }
 
    zend_compile_expr(&arg_node, args->child[0]);
    zend_emit_op_tmp(result, ZEND_GET_TYPE, &arg_node, NULL);
    return SUCCESS;
}
/* }}} */
 
static zend_result zend_compile_func_num_args(znode *result, zend_ast_list *args) /* {{{ */
{
    if (CG(active_op_array)->function_name && args->children == 0) {
        zend_emit_op_tmp(result, ZEND_FUNC_NUM_ARGS, NULL, NULL);
        return SUCCESS;
    } else {
        return FAILURE;
    }
}
/* }}} */
 
static zend_result zend_compile_func_get_args(znode *result, zend_ast_list *args) /* {{{ */
{
    if (CG(active_op_array)->function_name && args->children == 0) {
        zend_emit_op_tmp(result, ZEND_FUNC_GET_ARGS, NULL, NULL);
        return SUCCESS;
    } else {
        return FAILURE;
    }
}
/* }}} */
 
static zend_result zend_compile_func_array_key_exists(znode *result, zend_ast_list *args) /* {{{ */
{
    znode subject, needle;
 
    if (args->children != 2) {
        return FAILURE;
    }
 
    zend_compile_expr(&needle, args->child[0]);
    zend_compile_expr(&subject, args->child[1]);
 
    zend_emit_op_tmp(result, ZEND_ARRAY_KEY_EXISTS, &needle, &subject);
    return SUCCESS;
}
/* }}} */
 
static zend_result zend_compile_func_array_slice(znode *result, zend_ast_list *args) /* {{{ */
{
    if (CG(active_op_array)->function_name
     && args->children == 2
     && args->child[0]->kind == ZEND_AST_CALL
     && args->child[0]->child[0]->kind == ZEND_AST_ZVAL
     && Z_TYPE_P(zend_ast_get_zval(args->child[0]->child[0])) == IS_STRING
     && args->child[0]->child[1]->kind == ZEND_AST_ARG_LIST
     && args->child[1]->kind == ZEND_AST_ZVAL) {
 
        zend_string *orig_name = zend_ast_get_str(args->child[0]->child[0]);
        bool is_fully_qualified;
        zend_string *name = zend_resolve_function_name(orig_name, args->child[0]->child[0]->attr, &is_fully_qualified);
        zend_ast_list *list = zend_ast_get_list(args->child[0]->child[1]);
        zval *zv = zend_ast_get_zval(args->child[1]);
        znode first;
 
        if (zend_string_equals_literal_ci(name, "func_get_args")
         && list->children == 0
         && Z_TYPE_P(zv) == IS_LONG
         && Z_LVAL_P(zv) >= 0) {
            first.op_type = IS_CONST;
            ZVAL_LONG(&first.u.constant, Z_LVAL_P(zv));
            zend_emit_op_tmp(result, ZEND_FUNC_GET_ARGS, &first, NULL);
            zend_string_release_ex(name, 0);
            return SUCCESS;
        }
        zend_string_release_ex(name, 0);
    }
    return FAILURE;
}
/* }}} */
 
static uint32_t find_frameless_function_offset(uint32_t arity, void *handler)
{
    void **handlers = zend_flf_handlers;
    void **current = handlers;
    while (current) {
        if (*current == handler) {
            return current - handlers;
        }
        current++;
    }
 
    return (uint32_t)-1;
}
 
static const zend_frameless_function_info *find_frameless_function_info(zend_ast_list *args, zend_function *fbc, uint32_t type)
{
    if (zend_execute_internal) {
        return NULL;
    }
 
    if (type != BP_VAR_R) {
        return NULL;
    }
 
    if (ZEND_USER_CODE(fbc->type)) {
        return NULL;
    }
 
    const zend_frameless_function_info *frameless_function_info = fbc->internal_function.frameless_function_infos;
    if (!frameless_function_info) {
        return NULL;
    }
 
    if (args->children > 3) {
        return NULL;
    }
 
    while (frameless_function_info->handler) {
        if (frameless_function_info->num_args >= args->children
         && fbc->common.required_num_args <= args->children
         && (!(fbc->common.fn_flags & ZEND_ACC_VARIADIC)
          || frameless_function_info->num_args == args->children)) {
            uint32_t num_args = frameless_function_info->num_args;
            uint32_t offset = find_frameless_function_offset(num_args, frameless_function_info->handler);
            if (offset == (uint32_t)-1) {
                continue;
            }
            return frameless_function_info;
        }
        frameless_function_info++;
    }
 
    return NULL;
}
 
static uint32_t zend_compile_frameless_icall_ex(znode *result, zend_ast_list *args, zend_function *fbc, const zend_frameless_function_info *frameless_function_info, uint32_t type)
{
    int lineno = CG(zend_lineno);
    uint32_t num_args = frameless_function_info->num_args;
    uint32_t offset = find_frameless_function_offset(num_args, frameless_function_info->handler);
    znode arg_zvs[3];
    for (uint32_t i = 0; i < num_args; i++) {
        if (i < args->children) {
            zend_compile_expr(&arg_zvs[i], args->child[i]);
        } else {
            zend_internal_arg_info *arg_info = (zend_internal_arg_info *)&fbc->common.arg_info[i];
            arg_zvs[i].op_type = IS_CONST;
            if (zend_get_default_from_internal_arg_info(&arg_zvs[i].u.constant, arg_info) == FAILURE) {
                ZEND_UNREACHABLE();
            }
        }
    }
    uint8_t opcode = ZEND_FRAMELESS_ICALL_0 + num_args;
    uint32_t opnum = get_next_op_number();
    zend_op *opline = zend_emit_op_tmp(result, opcode, NULL, NULL);
    opline->extended_value = offset;
    opline->lineno = lineno;
    if (num_args >= 1) {
        SET_NODE(opline->op1, &arg_zvs[0]);
    }
    if (num_args >= 2) {
        SET_NODE(opline->op2, &arg_zvs[1]);
    }
    if (num_args >= 3) {
        zend_emit_op_data(&arg_zvs[2]);
    }
    return opnum;
}
 
static uint32_t zend_compile_frameless_icall(znode *result, zend_ast_list *args, zend_function *fbc, uint32_t type)
{
    const zend_frameless_function_info *frameless_function_info = find_frameless_function_info(args, fbc, type);
    if (!frameless_function_info) {
        return (uint32_t)-1;
    }
 
    return zend_compile_frameless_icall_ex(result, args, fbc, frameless_function_info, type);
}
 
static void zend_compile_ns_call(znode *result, znode *name_node, zend_ast *args_ast, uint32_t lineno, uint32_t type) /* {{{ */
{
    int name_constants = zend_add_ns_func_name_literal(Z_STR(name_node->u.constant));
 
    /* Find frameless function with same name. */
    zend_function *frameless_function = NULL;
    if (args_ast->kind != ZEND_AST_CALLABLE_CONVERT
     && !zend_args_contain_unpack_or_named(zend_ast_get_list(args_ast))
     /* Avoid blowing up op count with nested frameless branches. */
     && !CG(context).in_jmp_frameless_branch) {
        zend_string *lc_func_name = Z_STR_P(CT_CONSTANT_EX(CG(active_op_array), name_constants + 2));
        frameless_function = zend_hash_find_ptr(CG(function_table), lc_func_name);
    }
 
    /* Check whether any frameless handler may actually be used. */
    uint32_t jmp_fl_opnum = 0;
    const zend_frameless_function_info *frameless_function_info = NULL;
    if (frameless_function) {
        frameless_function_info = find_frameless_function_info(zend_ast_get_list(args_ast), frameless_function, type);
        if (frameless_function_info) {
            CG(context).in_jmp_frameless_branch = true;
            znode op1;
            op1.op_type = IS_CONST;
            ZVAL_COPY(&op1.u.constant, CT_CONSTANT_EX(CG(active_op_array), name_constants + 1));
            jmp_fl_opnum = get_next_op_number();
            zend_emit_op(NULL, ZEND_JMP_FRAMELESS, &op1, NULL);
        }
    }
 
    /* Compile ns call. */
    zend_op *opline = get_next_op();
    opline->opcode = ZEND_INIT_NS_FCALL_BY_NAME;
    opline->op2_type = IS_CONST;
    opline->op2.constant = name_constants;
    opline->result.num = zend_alloc_cache_slot();
    zend_compile_call_common(result, args_ast, NULL, lineno);
 
    /* Compile frameless call. */
    if (frameless_function_info) {
        CG(zend_lineno) = lineno;
 
        uint32_t jmp_end_opnum = zend_emit_jump(0);
        uint32_t jmp_fl_target = get_next_op_number();
 
        uint32_t flf_icall_opnum = zend_compile_frameless_icall_ex(NULL, zend_ast_get_list(args_ast), frameless_function, frameless_function_info, type);
 
        zend_op *jmp_fl = &CG(active_op_array)->opcodes[jmp_fl_opnum];
        jmp_fl->op2.opline_num = jmp_fl_target;
        jmp_fl->extended_value = zend_alloc_cache_slot();
        zend_op *flf_icall = &CG(active_op_array)->opcodes[flf_icall_opnum];
        SET_NODE(flf_icall->result, result);
        zend_update_jump_target_to_next(jmp_end_opnum);
 
        CG(context).in_jmp_frameless_branch = false;
    }
}
/* }}} */
 
static zend_op *zend_compile_rope_add(znode *result, uint32_t num, znode *elem_node);
static zend_op *zend_compile_rope_add_ex(zend_op *opline, znode *result, uint32_t num, znode *elem_node);
static void zend_compile_rope_finalize(znode *result, uint32_t j, zend_op *init_opline, zend_op *opline);
 
static zend_result zend_compile_func_sprintf(znode *result, zend_ast_list *args) /* {{{ */
{
    /* Bail out if we do not have a format string. */
    if (args->children < 1) {
        return FAILURE;
    }
 
    zend_eval_const_expr(&args->child[0]);
    /* Bail out if the format string is not constant. */
    if (args->child[0]->kind != ZEND_AST_ZVAL) {
        return FAILURE;
    }
 
    zval *format_string = zend_ast_get_zval(args->child[0]);
    if (Z_TYPE_P(format_string) != IS_STRING) {
        return FAILURE;
    }
    if (Z_STRLEN_P(format_string) >= 256) {
        return FAILURE;
    }
 
    char *p;
    char *end;
    uint32_t placeholder_count;
 
    placeholder_count = 0;
    p = Z_STRVAL_P(format_string);
    end = p + Z_STRLEN_P(format_string);
 
    for (;;) {
        p = memchr(p, '%', end - p);
        if (!p) {
            break;
        }
 
        char *q = p + 1;
        if (q == end) {
            return FAILURE;
        }
 
        switch (*q) {
            case 's':
            case 'd':
                placeholder_count++;
                break;
            case '%':
                break;
            default:
                return FAILURE;
        }
 
        p = q;
        p++;
    }
 
    /* Bail out if the number of placeholders does not match the number of values. */
    if (placeholder_count != (args->children - 1)) {
        return FAILURE;
    }
 
    /* Handle empty format strings. */
    if (Z_STRLEN_P(format_string) == 0) {
        result->op_type = IS_CONST;
        ZVAL_EMPTY_STRING(&result->u.constant);
 
        return SUCCESS;
    }
 
    znode *elements = NULL;
 
    if (placeholder_count > 0) {
        elements = safe_emalloc(sizeof(*elements), placeholder_count, 0);
    }
 
    /* Compile the value expressions first for error handling that is consistent
     * with a function call: Values that fail to convert to a string may emit errors.
     */
    for (uint32_t i = 0; i < placeholder_count; i++) {
        zend_compile_expr(elements + i, args->child[1 + i]);
    }
 
    uint32_t rope_elements = 0;
    uint32_t rope_init_lineno = -1;
    zend_op *opline = NULL;
 
    placeholder_count = 0;
    p = Z_STRVAL_P(format_string);
    end = p + Z_STRLEN_P(format_string);
    char *offset = p;
    for (;;) {
        p = memchr(p, '%', end - p);
        if (!p) {
            break;
        }
 
        char *q = p + 1;
        ZEND_ASSERT(q < end);
        ZEND_ASSERT(*q == 's' || *q == 'd' || *q == '%');
 
        if (*q == '%') {
            /* Optimization to not create a dedicated rope element for the literal '%':
             * Include the first '%' within the "constant" part instead of dropping the
             * full placeholder.
             */
            p++;
        }
 
        if (p != offset) {
            znode const_node;
            const_node.op_type = IS_CONST;
            ZVAL_STRINGL(&const_node.u.constant, offset, p - offset);
            if (rope_elements == 0) {
                rope_init_lineno = get_next_op_number();
            }
            opline = zend_compile_rope_add(result, rope_elements++, &const_node);
        }
 
        if (*q != '%') {
            switch (*q) {
                case 's':
                    /* Perform the cast of constants when actually evaluating the corresponding placeholder
                     * for correct error reporting.
                     */
                    if (elements[placeholder_count].op_type == IS_CONST) {
                        if (Z_TYPE(elements[placeholder_count].u.constant) == IS_ARRAY) {
                            zend_emit_op_tmp(&elements[placeholder_count], ZEND_CAST, &elements[placeholder_count], NULL)->extended_value = IS_STRING;
                        } else {
                            convert_to_string(&elements[placeholder_count].u.constant);
                        }
                    }
                    break;
                case 'd':
                    zend_emit_op_tmp(&elements[placeholder_count], ZEND_CAST, &elements[placeholder_count], NULL)->extended_value = IS_LONG;
                    break;
                EMPTY_SWITCH_DEFAULT_CASE();
            }
 
            if (rope_elements == 0) {
                rope_init_lineno = get_next_op_number();
            }
            opline = zend_compile_rope_add(result, rope_elements++, &elements[placeholder_count]);
 
            placeholder_count++;
        }
 
        p = q;
        p++;
        offset = p;
    }
    if (end != offset) {
        /* Add the constant part after the last placeholder. */
        znode const_node;
        const_node.op_type = IS_CONST;
        ZVAL_STRINGL(&const_node.u.constant, offset, end - offset);
        if (rope_elements == 0) {
            rope_init_lineno = get_next_op_number();
        }
        opline = zend_compile_rope_add(result, rope_elements++, &const_node);
    }
    ZEND_ASSERT(opline != NULL);
 
    zend_op *init_opline = CG(active_op_array)->opcodes + rope_init_lineno;
    zend_compile_rope_finalize(result, rope_elements, init_opline, opline);
    efree(elements);
 
    return SUCCESS;
}
 
static zend_result zend_try_compile_special_func_ex(znode *result, zend_string *lcname, zend_ast_list *args, zend_function *fbc, uint32_t type) /* {{{ */
{
    if (zend_string_equals_literal(lcname, "strlen")) {
        return zend_compile_func_strlen(result, args);
    } else if (zend_string_equals_literal(lcname, "is_null")) {
        return zend_compile_func_typecheck(result, args, IS_NULL);
    } else if (zend_string_equals_literal(lcname, "is_bool")) {
        return zend_compile_func_typecheck(result, args, _IS_BOOL);
    } else if (zend_string_equals_literal(lcname, "is_long")
        || zend_string_equals_literal(lcname, "is_int")
        || zend_string_equals_literal(lcname, "is_integer")
    ) {
        return zend_compile_func_typecheck(result, args, IS_LONG);
    } else if (zend_string_equals_literal(lcname, "is_float")
        || zend_string_equals_literal(lcname, "is_double")
    ) {
        return zend_compile_func_typecheck(result, args, IS_DOUBLE);
    } else if (zend_string_equals_literal(lcname, "is_string")) {
        return zend_compile_func_typecheck(result, args, IS_STRING);
    } else if (zend_string_equals_literal(lcname, "is_array")) {
        return zend_compile_func_typecheck(result, args, IS_ARRAY);
    } else if (zend_string_equals_literal(lcname, "is_object")) {
        return zend_compile_func_typecheck(result, args, IS_OBJECT);
    } else if (zend_string_equals_literal(lcname, "is_resource")) {
        return zend_compile_func_typecheck(result, args, IS_RESOURCE);
    } else if (zend_string_equals_literal(lcname, "is_scalar")) {
        return zend_compile_func_is_scalar(result, args);
    } else if (zend_string_equals_literal(lcname, "boolval")) {
        return zend_compile_func_cast(result, args, _IS_BOOL);
    } else if (zend_string_equals_literal(lcname, "intval")) {
        return zend_compile_func_cast(result, args, IS_LONG);
    } else if (zend_string_equals_literal(lcname, "floatval")
        || zend_string_equals_literal(lcname, "doubleval")
    ) {
        return zend_compile_func_cast(result, args, IS_DOUBLE);
    } else if (zend_string_equals_literal(lcname, "strval")) {
        return zend_compile_func_cast(result, args, IS_STRING);
    } else if (zend_string_equals_literal(lcname, "defined")) {
        return zend_compile_func_defined(result, args);
    } else if (zend_string_equals_literal(lcname, "chr") && type == BP_VAR_R) {
        return zend_compile_func_chr(result, args);
    } else if (zend_string_equals_literal(lcname, "ord") && type == BP_VAR_R) {
        return zend_compile_func_ord(result, args);
    } else if (zend_string_equals_literal(lcname, "call_user_func_array")) {
        return zend_compile_func_cufa(result, args, lcname);
    } else if (zend_string_equals_literal(lcname, "call_user_func")) {
        return zend_compile_func_cuf(result, args, lcname);
    } else if (zend_string_equals_literal(lcname, "in_array")) {
        return zend_compile_func_in_array(result, args);
    } else if (zend_string_equals(lcname, ZSTR_KNOWN(ZEND_STR_COUNT))
            || zend_string_equals_literal(lcname, "sizeof")) {
        return zend_compile_func_count(result, args, lcname);
    } else if (zend_string_equals_literal(lcname, "get_class")) {
        return zend_compile_func_get_class(result, args);
    } else if (zend_string_equals_literal(lcname, "get_called_class")) {
        return zend_compile_func_get_called_class(result, args);
    } else if (zend_string_equals_literal(lcname, "gettype")) {
        return zend_compile_func_gettype(result, args);
    } else if (zend_string_equals_literal(lcname, "func_num_args")) {
        return zend_compile_func_num_args(result, args);
    } else if (zend_string_equals_literal(lcname, "func_get_args")) {
        return zend_compile_func_get_args(result, args);
    } else if (zend_string_equals_literal(lcname, "array_slice")) {
        return zend_compile_func_array_slice(result, args);
    } else if (zend_string_equals_literal(lcname, "array_key_exists")) {
        return zend_compile_func_array_key_exists(result, args);
    } else if (zend_string_equals_literal(lcname, "sprintf")) {
        return zend_compile_func_sprintf(result, args);
    } else {
        return FAILURE;
    }
}
 
static zend_result zend_try_compile_special_func(znode *result, zend_string *lcname, zend_ast_list *args, zend_function *fbc, uint32_t type) /* {{{ */
{
    if (CG(compiler_options) & ZEND_COMPILE_NO_BUILTINS) {
        return FAILURE;
    }
 
    if (fbc->type != ZEND_INTERNAL_FUNCTION) {
        /* If the function is part of disabled_functions, it may be redeclared as a userland
         * function with a different implementation. Don't use the VM builtin in that case. */
        return FAILURE;
    }
 
    if (zend_args_contain_unpack_or_named(args)) {
        return FAILURE;
    }
 
    if (zend_try_compile_special_func_ex(result, lcname, args, fbc, type) == SUCCESS) {
        return SUCCESS;
    }
 
    return zend_compile_frameless_icall(result, args, fbc, type) != (uint32_t)-1 ? SUCCESS : FAILURE;
}
 
static const char *zend_get_cstring_from_property_hook_kind(zend_property_hook_kind kind) {
    switch (kind) {
        case ZEND_PROPERTY_HOOK_GET:
            return "get";
        case ZEND_PROPERTY_HOOK_SET:
            return "set";
        EMPTY_SWITCH_DEFAULT_CASE()
    }
}
 
static zend_string *zend_copy_unmangled_prop_name(zend_string *prop_name)
{
    if (ZSTR_VAL(prop_name)[0] != '\0') {
        return zend_string_copy(prop_name);
    } else {
        const char *unmangled = zend_get_unmangled_property_name(prop_name);
        return zend_string_init(unmangled, strlen(unmangled), /* persistent */ false);
    }
}
 
static bool zend_compile_parent_property_hook_call(znode *result, zend_ast *ast, uint32_t type)
{
    ZEND_ASSERT(ast->kind == ZEND_AST_STATIC_CALL);
 
    zend_ast *class_ast = ast->child[0];
    zend_ast *method_ast = ast->child[1];
 
    /* Recognize parent::$prop::get() pattern. */
    if (class_ast->kind != ZEND_AST_STATIC_PROP
     || (class_ast->attr & ZEND_PARENTHESIZED_STATIC_PROP)
     || class_ast->child[0]->kind != ZEND_AST_ZVAL
     || Z_TYPE_P(zend_ast_get_zval(class_ast->child[0])) != IS_STRING
     || zend_get_class_fetch_type(zend_ast_get_str(class_ast->child[0])) != ZEND_FETCH_CLASS_PARENT
     || class_ast->child[1]->kind != ZEND_AST_ZVAL
     || method_ast->kind != ZEND_AST_ZVAL
     || Z_TYPE_P(zend_ast_get_zval(method_ast)) != IS_STRING
     || (!zend_string_equals_literal_ci(zend_ast_get_str(method_ast), "get")
      && !zend_string_equals_literal_ci(zend_ast_get_str(method_ast), "set"))) {
        return false;
    }
 
    zend_class_entry *ce = CG(active_class_entry);
    if (!ce) {
        zend_error_noreturn(E_COMPILE_ERROR, "Cannot use \"parent\" when no class scope is active");
    }
 
    zend_ast *args_ast = ast->child[2];
    if (args_ast->kind == ZEND_AST_CALLABLE_CONVERT) {
        zend_error_noreturn(E_COMPILE_ERROR, "Cannot create Closure for parent property hook call");
    }
 
    zval *property_hook_name_zv = zend_ast_get_zval(class_ast->child[1]);
    zend_string *property_name = zval_get_string(property_hook_name_zv);
    zend_string *hook_name = zend_ast_get_str(method_ast);
    zend_property_hook_kind hook_kind = zend_get_property_hook_kind_from_name(hook_name);
    ZEND_ASSERT(hook_kind != (uint32_t)-1);
 
    const zend_property_info *prop_info = CG(context).active_property_info;
    if (!prop_info) {
        zend_error_noreturn(E_COMPILE_ERROR, "Must not use parent::$%s::%s() outside a property hook",
            ZSTR_VAL(property_name), ZSTR_VAL(hook_name));
    }
 
    const char *unmangled_prop_name = zend_get_unmangled_property_name(prop_info->name);
    if (!zend_string_equals_cstr(property_name, unmangled_prop_name, strlen(unmangled_prop_name))) {
        zend_error_noreturn(E_COMPILE_ERROR, "Must not use parent::$%s::%s() in a different property ($%s)",
            ZSTR_VAL(property_name), ZSTR_VAL(hook_name), unmangled_prop_name);
    }
    if (hook_kind != CG(context).active_property_hook_kind) {
        zend_error_noreturn(E_COMPILE_ERROR, "Must not use parent::$%s::%s() in a different property hook (%s)",
            ZSTR_VAL(property_name), ZSTR_VAL(hook_name), zend_get_cstring_from_property_hook_kind(CG(context).active_property_hook_kind));
    }
 
    zend_op *opline = get_next_op();
    opline->opcode = ZEND_INIT_PARENT_PROPERTY_HOOK_CALL;
    opline->op1_type = IS_CONST;
    opline->op1.constant = zend_add_literal_string(&property_name);
    opline->op2.num = hook_kind;
 
    zend_function *fbc = NULL;
    zend_compile_call_common(result, args_ast, fbc, zend_ast_get_lineno(method_ast));
 
    return true;
}
 
static void zend_compile_call(znode *result, zend_ast *ast, uint32_t type) /* {{{ */
{
    zend_ast *name_ast = ast->child[0];
    zend_ast *args_ast = ast->child[1];
    bool is_callable_convert = args_ast->kind == ZEND_AST_CALLABLE_CONVERT;
 
    znode name_node;
 
    if (name_ast->kind != ZEND_AST_ZVAL || Z_TYPE_P(zend_ast_get_zval(name_ast)) != IS_STRING) {
        zend_compile_expr(&name_node, name_ast);
        zend_compile_dynamic_call(result, &name_node, args_ast, ast->lineno);
        return;
    }
 
    {
        bool runtime_resolution = zend_compile_function_name(&name_node, name_ast);
        if (runtime_resolution) {
            if (zend_string_equals_literal_ci(zend_ast_get_str(name_ast), "assert")
                    && !is_callable_convert) {
                zend_compile_assert(result, zend_ast_get_list(args_ast), Z_STR(name_node.u.constant), NULL, ast->lineno);
            } else {
                zend_compile_ns_call(result, &name_node, args_ast, ast->lineno, type);
            }
            return;
        }
    }
 
    {
        zval *name = &name_node.u.constant;
        zend_string *lcname;
        zend_function *fbc;
        zend_op *opline;
 
        lcname = zend_string_tolower(Z_STR_P(name));
        zval *fbc_zv = zend_hash_find(CG(function_table), lcname);
        fbc = fbc_zv ? Z_PTR_P(fbc_zv) : NULL;
 
        /* Special assert() handling should apply independently of compiler flags. */
        if (fbc && zend_string_equals_literal(lcname, "assert") && !is_callable_convert) {
            zend_compile_assert(result, zend_ast_get_list(args_ast), lcname, fbc, ast->lineno);
            zend_string_release(lcname);
            zval_ptr_dtor(&name_node.u.constant);
            return;
        }
 
        if (!fbc
         || !fbc_is_finalized(fbc)
         || zend_compile_ignore_function(fbc, CG(active_op_array)->filename)) {
            zend_string_release_ex(lcname, 0);
            zend_compile_dynamic_call(result, &name_node, args_ast, ast->lineno);
            return;
        }
 
        if (!is_callable_convert &&
            zend_try_compile_special_func(result, lcname,
                zend_ast_get_list(args_ast), fbc, type) == SUCCESS
        ) {
            zend_string_release_ex(lcname, 0);
            zval_ptr_dtor(&name_node.u.constant);
            return;
        }
 
        zval_ptr_dtor(&name_node.u.constant);
        ZVAL_NEW_STR(&name_node.u.constant, lcname);
 
        opline = zend_emit_op(NULL, ZEND_INIT_FCALL, NULL, &name_node);
        opline->result.num = zend_alloc_cache_slot();
 
        /* Store offset to function from symbol table in op2.extra. */
        if (fbc->type == ZEND_INTERNAL_FUNCTION) {
            Bucket *fbc_bucket = (Bucket*)((uintptr_t)fbc_zv - XtOffsetOf(Bucket, val));
            Z_EXTRA_P(CT_CONSTANT(opline->op2)) = fbc_bucket - CG(function_table)->arData;
        }
 
        zend_compile_call_common(result, args_ast, fbc, ast->lineno);
    }
}
/* }}} */
 
static void zend_compile_method_call(znode *result, zend_ast *ast, uint32_t type) /* {{{ */
{
    zend_ast *obj_ast = ast->child[0];
    zend_ast *method_ast = ast->child[1];
    zend_ast *args_ast = ast->child[2];
 
    znode obj_node, method_node;
    zend_op *opline;
    zend_function *fbc = NULL;
    bool nullsafe = ast->kind == ZEND_AST_NULLSAFE_METHOD_CALL;
    uint32_t short_circuiting_checkpoint = zend_short_circuiting_checkpoint();
 
    if (is_this_fetch(obj_ast)) {
        if (this_guaranteed_exists()) {
            obj_node.op_type = IS_UNUSED;
        } else {
            zend_emit_op(&obj_node, ZEND_FETCH_THIS, NULL, NULL);
        }
        CG(active_op_array)->fn_flags |= ZEND_ACC_USES_THIS;
 
        /* We will throw if $this doesn't exist, so there's no need to emit a JMP_NULL
         * check for a nullsafe access. */
    } else {
        zend_short_circuiting_mark_inner(obj_ast);
        zend_compile_expr(&obj_node, obj_ast);
        if (nullsafe) {
            zend_emit_jmp_null(&obj_node, type);
        }
    }
 
    zend_compile_expr(&method_node, method_ast);
    opline = zend_emit_op(NULL, ZEND_INIT_METHOD_CALL, &obj_node, NULL);
 
    if (method_node.op_type == IS_CONST) {
        if (Z_TYPE(method_node.u.constant) != IS_STRING) {
            zend_error_noreturn(E_COMPILE_ERROR, "Method name must be a string");
        }
 
        opline->op2_type = IS_CONST;
        opline->op2.constant = zend_add_func_name_literal(
            Z_STR(method_node.u.constant));
        opline->result.num = zend_alloc_cache_slots(2);
    } else {
        SET_NODE(opline->op2, &method_node);
    }
 
    /* Check if this calls a known method on $this */
    if (opline->op1_type == IS_UNUSED && opline->op2_type == IS_CONST &&
            CG(active_class_entry) && zend_is_scope_known()) {
        zend_string *lcname = Z_STR_P(CT_CONSTANT(opline->op2) + 1);
        fbc = zend_hash_find_ptr(&CG(active_class_entry)->function_table, lcname);
 
        /* We only know the exact method that is being called if it is either private or final.
         * Otherwise an overriding method in a child class may be called. */
        if (fbc && !(fbc->common.fn_flags & (ZEND_ACC_PRIVATE|ZEND_ACC_FINAL))) {
            fbc = NULL;
        }
    }
 
    if (zend_compile_call_common(result, args_ast, fbc, zend_ast_get_lineno(method_ast))) {
        if (short_circuiting_checkpoint != zend_short_circuiting_checkpoint()) {
            zend_error_noreturn(E_COMPILE_ERROR,
                "Cannot combine nullsafe operator with Closure creation");
        }
    }
}
/* }}} */
 
static bool zend_is_constructor(zend_string *name) /* {{{ */
{
    return zend_string_equals_literal_ci(name, ZEND_CONSTRUCTOR_FUNC_NAME);
}
/* }}} */
 
static zend_function *zend_get_compatible_func_or_null(zend_class_entry *ce, zend_string *lcname) /* {{{ */
{
    zend_function *fbc = zend_hash_find_ptr(&ce->function_table, lcname);
    if (!fbc || (fbc->common.fn_flags & ZEND_ACC_PUBLIC) || ce == CG(active_class_entry)) {
        return fbc;
    }
 
    if (!(fbc->common.fn_flags & ZEND_ACC_PRIVATE)
        && (fbc->common.scope->ce_flags & ZEND_ACC_LINKED)
        && (!CG(active_class_entry) || (CG(active_class_entry)->ce_flags & ZEND_ACC_LINKED))
        && zend_check_protected(zend_get_function_root_class(fbc), CG(active_class_entry))) {
        return fbc;
    }
 
    return NULL;
}
/* }}} */
 
static void zend_compile_static_call(znode *result, zend_ast *ast, uint32_t type) /* {{{ */
{
    zend_ast *class_ast = ast->child[0];
    zend_ast *method_ast = ast->child[1];
    zend_ast *args_ast = ast->child[2];
 
    znode class_node, method_node;
    zend_op *opline;
    zend_function *fbc = NULL;
 
    if (zend_compile_parent_property_hook_call(result, ast, type)) {
        return;
    }
 
    zend_short_circuiting_mark_inner(class_ast);
    zend_compile_class_ref(&class_node, class_ast, ZEND_FETCH_CLASS_EXCEPTION);
 
    zend_compile_expr(&method_node, method_ast);
 
    if (method_node.op_type == IS_CONST) {
        zval *name = &method_node.u.constant;
        if (Z_TYPE_P(name) != IS_STRING) {
            zend_error_noreturn(E_COMPILE_ERROR, "Method name must be a string");
        }
        if (zend_is_constructor(Z_STR_P(name))) {
            zval_ptr_dtor(name);
            method_node.op_type = IS_UNUSED;
        }
    }
 
    opline = get_next_op();
    opline->opcode = ZEND_INIT_STATIC_METHOD_CALL;
 
    zend_set_class_name_op1(opline, &class_node);
 
    if (method_node.op_type == IS_CONST) {
        opline->op2_type = IS_CONST;
        opline->op2.constant = zend_add_func_name_literal(
            Z_STR(method_node.u.constant));
        opline->result.num = zend_alloc_cache_slots(2);
    } else {
        if (opline->op1_type == IS_CONST) {
            opline->result.num = zend_alloc_cache_slot();
        }
        SET_NODE(opline->op2, &method_node);
    }
 
    /* Check if we already know which method we're calling */
    if (opline->op2_type == IS_CONST) {
        zend_class_entry *ce = NULL;
        if (opline->op1_type == IS_CONST) {
            zend_string *lcname = Z_STR_P(CT_CONSTANT(opline->op1) + 1);
            ce = zend_hash_find_ptr(CG(class_table), lcname);
            if (ce) {
                if (zend_compile_ignore_class(ce, CG(active_op_array)->filename)) {
                    ce = NULL;
                }
            } else if (CG(active_class_entry)
                    && zend_string_equals_ci(CG(active_class_entry)->name, lcname)) {
                ce = CG(active_class_entry);
            }
        } else if (opline->op1_type == IS_UNUSED
                && (opline->op1.num & ZEND_FETCH_CLASS_MASK) == ZEND_FETCH_CLASS_SELF
                && zend_is_scope_known()) {
            ce = CG(active_class_entry);
        }
        if (ce) {
            zend_string *lcname = Z_STR_P(CT_CONSTANT(opline->op2) + 1);
            fbc = zend_get_compatible_func_or_null(ce, lcname);
        }
    }
 
    zend_compile_call_common(result, args_ast, fbc, zend_ast_get_lineno(method_ast));
}
/* }}} */
 
static void zend_compile_class_decl(znode *result, zend_ast *ast, bool toplevel);
 
static void zend_compile_new(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *class_ast = ast->child[0];
    zend_ast *args_ast = ast->child[1];
 
    znode class_node, ctor_result;
    zend_op *opline;
 
    if (class_ast->kind == ZEND_AST_CLASS) {
        /* anon class declaration */
        zend_compile_class_decl(&class_node, class_ast, 0);
    } else {
        zend_compile_class_ref(&class_node, class_ast, ZEND_FETCH_CLASS_EXCEPTION);
    }
 
    opline = zend_emit_op(result, ZEND_NEW, NULL, NULL);
 
    if (class_node.op_type == IS_CONST) {
        opline->op1_type = IS_CONST;
        opline->op1.constant = zend_add_class_name_literal(
            Z_STR(class_node.u.constant));
        opline->op2.num = zend_alloc_cache_slot();
    } else {
        SET_NODE(opline->op1, &class_node);
    }
 
    zend_compile_call_common(&ctor_result, args_ast, NULL, ast->lineno);
    zend_do_free(&ctor_result);
}
/* }}} */
 
static void zend_compile_clone(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *obj_ast = ast->child[0];
 
    znode obj_node;
    zend_compile_expr(&obj_node, obj_ast);
 
    zend_emit_op_tmp(result, ZEND_CLONE, &obj_node, NULL);
}
/* }}} */
 
static void zend_compile_global_var(zend_ast *ast) /* {{{ */
{
    zend_ast *var_ast = ast->child[0];
    zend_ast *name_ast = var_ast->child[0];
 
    znode name_node, result;
 
    zend_compile_expr(&name_node, name_ast);
    if (name_node.op_type == IS_CONST) {
        convert_to_string(&name_node.u.constant);
    }
 
    // TODO(GLOBALS) Forbid "global $GLOBALS"?
    if (is_this_fetch(var_ast)) {
        zend_error_noreturn(E_COMPILE_ERROR, "Cannot use $this as global variable");
    } else if (zend_try_compile_cv(&result, var_ast) == SUCCESS) {
        zend_op *opline = zend_emit_op(NULL, ZEND_BIND_GLOBAL, &result, &name_node);
        opline->extended_value = zend_alloc_cache_slot();
    } else {
        /* name_ast should be evaluated only. FETCH_GLOBAL_LOCK instructs FETCH_W
         * to not free the name_node operand, so it can be reused in the following
         * ASSIGN_REF, which then frees it. */
        zend_op *opline = zend_emit_op(&result, ZEND_FETCH_W, &name_node, NULL);
        opline->extended_value = ZEND_FETCH_GLOBAL_LOCK;
 
        if (name_node.op_type == IS_CONST) {
            zend_string_addref(Z_STR(name_node.u.constant));
        }
 
        zend_emit_assign_ref_znode(
            zend_ast_create(ZEND_AST_VAR, zend_ast_create_znode(&name_node)),
            &result
        );
    }
}
/* }}} */
 
static void zend_compile_static_var_common(zend_string *var_name, zval *value, uint32_t mode) /* {{{ */
{
    zend_op *opline;
    if (!CG(active_op_array)->static_variables) {
        if (CG(active_op_array)->scope) {
            CG(active_op_array)->scope->ce_flags |= ZEND_HAS_STATIC_IN_METHODS;
        }
        CG(active_op_array)->static_variables = zend_new_array(8);
    }
 
    value = zend_hash_update(CG(active_op_array)->static_variables, var_name, value);
 
    if (zend_string_equals(var_name, ZSTR_KNOWN(ZEND_STR_THIS))) {
        zend_error_noreturn(E_COMPILE_ERROR, "Cannot use $this as static variable");
    }
 
    opline = zend_emit_op(NULL, ZEND_BIND_STATIC, NULL, NULL);
    opline->op1_type = IS_CV;
    opline->op1.var = lookup_cv(var_name);
    opline->extended_value = (uint32_t)((char*)value - (char*)CG(active_op_array)->static_variables->arData) | mode;
}
/* }}} */
 
static void zend_compile_static_var(zend_ast *ast) /* {{{ */
{
    zend_ast *var_ast = ast->child[0];
    zend_string *var_name = zend_ast_get_str(var_ast);
 
    if (zend_string_equals(var_name, ZSTR_KNOWN(ZEND_STR_THIS))) {
        zend_error_noreturn(E_COMPILE_ERROR, "Cannot use $this as static variable");
    }
 
    if (!CG(active_op_array)->static_variables) {
        if (CG(active_op_array)->scope) {
            CG(active_op_array)->scope->ce_flags |= ZEND_HAS_STATIC_IN_METHODS;
        }
        CG(active_op_array)->static_variables = zend_new_array(8);
    }
 
    if (zend_hash_exists(CG(active_op_array)->static_variables, var_name)) {
        zend_error_noreturn_unchecked(E_COMPILE_ERROR, "Duplicate declaration of static variable $%S", var_name);
    }
 
    zend_eval_const_expr(&ast->child[1]);
    zend_ast *value_ast = ast->child[1];
 
    if (!value_ast || value_ast->kind == ZEND_AST_ZVAL) {
        zval *value_zv = value_ast
            ? zend_ast_get_zval(value_ast)
            : &EG(uninitialized_zval);
        Z_TRY_ADDREF_P(value_zv);
        zend_compile_static_var_common(var_name, value_zv, ZEND_BIND_REF);
    } else {
        zend_op *opline;
 
        zval *placeholder_ptr = zend_hash_update(CG(active_op_array)->static_variables, var_name, &EG(uninitialized_zval));
        uint32_t placeholder_offset = (uint32_t)((char*)placeholder_ptr - (char*)CG(active_op_array)->static_variables->arData);
 
        uint32_t static_def_jmp_opnum = get_next_op_number();
        opline = zend_emit_op(NULL, ZEND_BIND_INIT_STATIC_OR_JMP, NULL, NULL);
        opline->op1_type = IS_CV;
        opline->op1.var = lookup_cv(var_name);
        opline->extended_value = placeholder_offset;
 
        znode expr;
        zend_compile_expr(&expr, value_ast);
 
        opline = zend_emit_op(NULL, ZEND_BIND_STATIC, NULL, &expr);
        opline->op1_type = IS_CV;
        opline->op1.var = lookup_cv(var_name);
        opline->extended_value = placeholder_offset | ZEND_BIND_REF;
 
        zend_update_jump_target_to_next(static_def_jmp_opnum);
    }
}
/* }}} */
 
static void zend_compile_unset(zend_ast *ast) /* {{{ */
{
    zend_ast *var_ast = ast->child[0];
    znode var_node;
    zend_op *opline;
 
    zend_ensure_writable_variable(var_ast);
 
    if (is_global_var_fetch(var_ast)) {
        if (!var_ast->child[1]) {
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot use [] for unsetting");
        }
 
        zend_compile_expr(&var_node, var_ast->child[1]);
        if (var_node.op_type == IS_CONST) {
            convert_to_string(&var_node.u.constant);
        }
 
        opline = zend_emit_op(NULL, ZEND_UNSET_VAR, &var_node, NULL);
        opline->extended_value = ZEND_FETCH_GLOBAL;
        return;
    }
 
    switch (var_ast->kind) {
        case ZEND_AST_VAR:
            if (is_this_fetch(var_ast)) {
                zend_error_noreturn(E_COMPILE_ERROR, "Cannot unset $this");
            } else if (zend_try_compile_cv(&var_node, var_ast) == SUCCESS) {
                opline = zend_emit_op(NULL, ZEND_UNSET_CV, &var_node, NULL);
            } else {
                opline = zend_compile_simple_var_no_cv(NULL, var_ast, BP_VAR_UNSET, 0);
                opline->opcode = ZEND_UNSET_VAR;
            }
            return;
        case ZEND_AST_DIM:
            opline = zend_compile_dim(NULL, var_ast, BP_VAR_UNSET, /* by_ref */ false);
            opline->opcode = ZEND_UNSET_DIM;
            return;
        case ZEND_AST_PROP:
        case ZEND_AST_NULLSAFE_PROP:
            opline = zend_compile_prop(NULL, var_ast, BP_VAR_UNSET, 0);
            opline->opcode = ZEND_UNSET_OBJ;
            return;
        case ZEND_AST_STATIC_PROP:
            opline = zend_compile_static_prop(NULL, var_ast, BP_VAR_UNSET, 0, 0);
            opline->opcode = ZEND_UNSET_STATIC_PROP;
            return;
        EMPTY_SWITCH_DEFAULT_CASE()
    }
}
/* }}} */
 
static bool zend_handle_loops_and_finally_ex(zend_long depth, znode *return_value) /* {{{ */
{
    zend_loop_var *base;
    zend_loop_var *loop_var = zend_stack_top(&CG(loop_var_stack));
 
    if (!loop_var) {
        return 1;
    }
    base = zend_stack_base(&CG(loop_var_stack));
    for (; loop_var >= base; loop_var--) {
        if (loop_var->opcode == ZEND_FAST_CALL) {
            zend_op *opline = get_next_op();
 
            opline->opcode = ZEND_FAST_CALL;
            opline->result_type = IS_TMP_VAR;
            opline->result.var = loop_var->var_num;
            if (return_value) {
                SET_NODE(opline->op2, return_value);
            }
            opline->op1.num = loop_var->try_catch_offset;
        } else if (loop_var->opcode == ZEND_DISCARD_EXCEPTION) {
            zend_op *opline = get_next_op();
            opline->opcode = ZEND_DISCARD_EXCEPTION;
            opline->op1_type = IS_TMP_VAR;
            opline->op1.var = loop_var->var_num;
        } else if (loop_var->opcode == ZEND_RETURN) {
            /* Stack separator */
            break;
        } else if (depth <= 1) {
            return 1;
        } else if (loop_var->opcode == ZEND_NOP) {
            /* Loop doesn't have freeable variable */
            depth--;
        } else {
            zend_op *opline;
 
            ZEND_ASSERT(loop_var->var_type & (IS_VAR|IS_TMP_VAR));
            opline = get_next_op();
            opline->opcode = loop_var->opcode;
            opline->op1_type = loop_var->var_type;
            opline->op1.var = loop_var->var_num;
            opline->extended_value = ZEND_FREE_ON_RETURN;
            depth--;
        }
    }
    return (depth == 0);
}
/* }}} */
 
static bool zend_handle_loops_and_finally(znode *return_value) /* {{{ */
{
    return zend_handle_loops_and_finally_ex(zend_stack_count(&CG(loop_var_stack)) + 1, return_value);
}
/* }}} */
 
static bool zend_has_finally_ex(zend_long depth) /* {{{ */
{
    zend_loop_var *base;
    zend_loop_var *loop_var = zend_stack_top(&CG(loop_var_stack));
 
    if (!loop_var) {
        return 0;
    }
    base = zend_stack_base(&CG(loop_var_stack));
    for (; loop_var >= base; loop_var--) {
        if (loop_var->opcode == ZEND_FAST_CALL) {
            return 1;
        } else if (loop_var->opcode == ZEND_DISCARD_EXCEPTION) {
        } else if (loop_var->opcode == ZEND_RETURN) {
            /* Stack separator */
            return 0;
        } else if (depth <= 1) {
            return 0;
        } else {
            depth--;
        }
    }
    return 0;
}
/* }}} */
 
static bool zend_has_finally(void) /* {{{ */
{
    return zend_has_finally_ex(zend_stack_count(&CG(loop_var_stack)) + 1);
}
/* }}} */
 
static void zend_compile_return(zend_ast *ast) /* {{{ */
{
    zend_ast *expr_ast = ast->child[0];
    bool is_generator = (CG(active_op_array)->fn_flags & ZEND_ACC_GENERATOR) != 0;
    bool by_ref = (CG(active_op_array)->fn_flags & ZEND_ACC_RETURN_REFERENCE) != 0;
 
    znode expr_node;
    zend_op *opline;
 
    if (is_generator) {
        /* For generators the by-ref flag refers to yields, not returns */
        by_ref = 0;
    }
 
    if (!expr_ast) {
        expr_node.op_type = IS_CONST;
        ZVAL_NULL(&expr_node.u.constant);
    } else if (by_ref && zend_is_variable(expr_ast)) {
        zend_assert_not_short_circuited(expr_ast);
        zend_compile_var(&expr_node, expr_ast, BP_VAR_W, 1);
    } else {
        zend_compile_expr(&expr_node, expr_ast);
    }
 
    if ((CG(active_op_array)->fn_flags & ZEND_ACC_HAS_FINALLY_BLOCK)
     && (expr_node.op_type == IS_CV || (by_ref && expr_node.op_type == IS_VAR))
     && zend_has_finally()) {
        /* Copy return value into temporary VAR to avoid modification in finally code */
        if (by_ref) {
            zend_emit_op(&expr_node, ZEND_MAKE_REF, &expr_node, NULL);
        } else {
            zend_emit_op_tmp(&expr_node, ZEND_QM_ASSIGN, &expr_node, NULL);
        }
    }
 
    /* Generator return types are handled separately */
    if (!is_generator && (CG(active_op_array)->fn_flags & ZEND_ACC_HAS_RETURN_TYPE)) {
        zend_emit_return_type_check(
            expr_ast ? &expr_node : NULL, CG(active_op_array)->arg_info - 1, 0);
    }
 
    zend_handle_loops_and_finally((expr_node.op_type & (IS_TMP_VAR | IS_VAR)) ? &expr_node : NULL);
 
    opline = zend_emit_op(NULL, by_ref ? ZEND_RETURN_BY_REF : ZEND_RETURN,
        &expr_node, NULL);
 
    if (by_ref && expr_ast) {
        if (zend_is_call(expr_ast)) {
            opline->extended_value = ZEND_RETURNS_FUNCTION;
        } else if (!zend_is_variable(expr_ast) || zend_ast_is_short_circuited(expr_ast)) {
            opline->extended_value = ZEND_RETURNS_VALUE;
        }
    }
}
/* }}} */
 
static void zend_compile_echo(zend_ast *ast) /* {{{ */
{
    zend_op *opline;
    zend_ast *expr_ast = ast->child[0];
 
    znode expr_node;
    zend_compile_expr(&expr_node, expr_ast);
 
    opline = zend_emit_op(NULL, ZEND_ECHO, &expr_node, NULL);
    opline->extended_value = 0;
}
/* }}} */
 
static void zend_compile_throw(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *expr_ast = ast->child[0];
 
    znode expr_node;
    zend_compile_expr(&expr_node, expr_ast);
 
    zend_op *opline = zend_emit_op(NULL, ZEND_THROW, &expr_node, NULL);
    if (result) {
        /* Mark this as an "expression throw" for opcache. */
        opline->extended_value = ZEND_THROW_IS_EXPR;
        result->op_type = IS_CONST;
        ZVAL_TRUE(&result->u.constant);
    }
}
/* }}} */
 
static void zend_compile_break_continue(zend_ast *ast) /* {{{ */
{
    zend_ast *depth_ast = ast->child[0];
 
    zend_op *opline;
    zend_long depth;
 
    ZEND_ASSERT(ast->kind == ZEND_AST_BREAK || ast->kind == ZEND_AST_CONTINUE);
 
    if (depth_ast) {
        zval *depth_zv;
        if (depth_ast->kind != ZEND_AST_ZVAL) {
            zend_error_noreturn(E_COMPILE_ERROR, "'%s' operator with non-integer operand "
                "is no longer supported", ast->kind == ZEND_AST_BREAK ? "break" : "continue");
        }
 
        depth_zv = zend_ast_get_zval(depth_ast);
        if (Z_TYPE_P(depth_zv) != IS_LONG || Z_LVAL_P(depth_zv) < 1) {
            zend_error_noreturn(E_COMPILE_ERROR, "'%s' operator accepts only positive integers",
                ast->kind == ZEND_AST_BREAK ? "break" : "continue");
        }
 
        depth = Z_LVAL_P(depth_zv);
    } else {
        depth = 1;
    }
 
    if (CG(context).current_brk_cont == -1) {
        zend_error_noreturn(E_COMPILE_ERROR, "'%s' not in the 'loop' or 'switch' context",
            ast->kind == ZEND_AST_BREAK ? "break" : "continue");
    } else {
        if (!zend_handle_loops_and_finally_ex(depth, NULL)) {
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot '%s' " ZEND_LONG_FMT " level%s",
                ast->kind == ZEND_AST_BREAK ? "break" : "continue",
                depth, depth == 1 ? "" : "s");
        }
    }
 
    if (ast->kind == ZEND_AST_CONTINUE) {
        int d, cur = CG(context).current_brk_cont;
        for (d = depth - 1; d > 0; d--) {
            cur = CG(context).brk_cont_array[cur].parent;
            ZEND_ASSERT(cur != -1);
        }
 
        if (CG(context).brk_cont_array[cur].is_switch) {
            if (depth == 1) {
                if (CG(context).brk_cont_array[cur].parent == -1) {
                    zend_error(E_WARNING,
                        "\"continue\" targeting switch is equivalent to \"break\"");
                } else {
                    zend_error(E_WARNING,
                        "\"continue\" targeting switch is equivalent to \"break\". " \
                        "Did you mean to use \"continue " ZEND_LONG_FMT "\"?",
                        depth + 1);
                }
            } else {
                if (CG(context).brk_cont_array[cur].parent == -1) {
                    zend_error(E_WARNING,
                        "\"continue " ZEND_LONG_FMT "\" targeting switch is equivalent to \"break " ZEND_LONG_FMT "\"",
                        depth, depth);
                } else {
                    zend_error(E_WARNING,
                        "\"continue " ZEND_LONG_FMT "\" targeting switch is equivalent to \"break " ZEND_LONG_FMT "\". " \
                        "Did you mean to use \"continue " ZEND_LONG_FMT "\"?",
                        depth, depth, depth + 1);
                }
            }
        }
    }
 
    opline = zend_emit_op(NULL, ast->kind == ZEND_AST_BREAK ? ZEND_BRK : ZEND_CONT, NULL, NULL);
    opline->op1.num = CG(context).current_brk_cont;
    opline->op2.num = depth;
}
/* }}} */
 
void zend_resolve_goto_label(zend_op_array *op_array, zend_op *opline) /* {{{ */
{
    zend_label *dest;
    int current, remove_oplines = opline->op1.num;
    zval *label;
    uint32_t opnum = opline - op_array->opcodes;
 
    label = CT_CONSTANT_EX(op_array, opline->op2.constant);
    if (CG(context).labels == NULL ||
        (dest = zend_hash_find_ptr(CG(context).labels, Z_STR_P(label))) == NULL
    ) {
        CG(in_compilation) = 1;
        CG(active_op_array) = op_array;
        CG(zend_lineno) = opline->lineno;
        zend_error_noreturn(E_COMPILE_ERROR, "'goto' to undefined label '%s'", Z_STRVAL_P(label));
    }
 
    zval_ptr_dtor_str(label);
    ZVAL_NULL(label);
 
    current = opline->extended_value;
    for (; current != dest->brk_cont; current = CG(context).brk_cont_array[current].parent) {
        if (current == -1) {
            CG(in_compilation) = 1;
            CG(active_op_array) = op_array;
            CG(zend_lineno) = opline->lineno;
            zend_error_noreturn(E_COMPILE_ERROR, "'goto' into loop or switch statement is disallowed");
        }
        if (CG(context).brk_cont_array[current].start >= 0) {
            remove_oplines--;
        }
    }
 
    for (current = 0; current < op_array->last_try_catch; ++current) {
        zend_try_catch_element *elem = &op_array->try_catch_array[current];
        if (elem->try_op > opnum) {
            break;
        }
        if (elem->finally_op && opnum < elem->finally_op - 1
            && (dest->opline_num > elem->finally_end || dest->opline_num < elem->try_op)
        ) {
            remove_oplines--;
        }
    }
 
    opline->opcode = ZEND_JMP;
    SET_UNUSED(opline->op1);
    SET_UNUSED(opline->op2);
    SET_UNUSED(opline->result);
    opline->op1.opline_num = dest->opline_num;
    opline->extended_value = 0;
 
    ZEND_ASSERT(remove_oplines >= 0);
    while (remove_oplines--) {
        opline--;
        MAKE_NOP(opline);
        ZEND_VM_SET_OPCODE_HANDLER(opline);
    }
}
/* }}} */
 
static void zend_compile_goto(zend_ast *ast) /* {{{ */
{
    zend_ast *label_ast = ast->child[0];
    znode label_node;
    zend_op *opline;
 
    zend_compile_expr(&label_node, label_ast);
 
    /* Label resolution and unwinding adjustments happen in pass two. */
    uint32_t opnum_start = get_next_op_number();
    zend_handle_loops_and_finally(NULL);
    opline = zend_emit_op(NULL, ZEND_GOTO, NULL, &label_node);
    opline->op1.num = get_next_op_number() - opnum_start - 1;
    opline->extended_value = CG(context).current_brk_cont;
}
/* }}} */
 
static void zend_compile_label(zend_ast *ast) /* {{{ */
{
    zend_string *label = zend_ast_get_str(ast->child[0]);
    zend_label dest;
 
    if (!CG(context).labels) {
        ALLOC_HASHTABLE(CG(context).labels);
        zend_hash_init(CG(context).labels, 8, NULL, label_ptr_dtor, 0);
    }
 
    dest.brk_cont = CG(context).current_brk_cont;
    dest.opline_num = get_next_op_number();
 
    if (!zend_hash_add_mem(CG(context).labels, label, &dest, sizeof(zend_label))) {
        zend_error_noreturn(E_COMPILE_ERROR, "Label '%s' already defined", ZSTR_VAL(label));
    }
}
/* }}} */
 
static void zend_compile_while(zend_ast *ast) /* {{{ */
{
    zend_ast *cond_ast = ast->child[0];
    zend_ast *stmt_ast = ast->child[1];
    znode cond_node;
    uint32_t opnum_start, opnum_jmp, opnum_cond;
 
    opnum_jmp = zend_emit_jump(0);
 
    zend_begin_loop(ZEND_NOP, NULL, 0);
 
    opnum_start = get_next_op_number();
    zend_compile_stmt(stmt_ast);
 
    opnum_cond = get_next_op_number();
    zend_update_jump_target(opnum_jmp, opnum_cond);
    zend_compile_expr(&cond_node, cond_ast);
 
    zend_emit_cond_jump(ZEND_JMPNZ, &cond_node, opnum_start);
 
    zend_end_loop(opnum_cond, NULL);
}
/* }}} */
 
static void zend_compile_do_while(zend_ast *ast) /* {{{ */
{
    zend_ast *stmt_ast = ast->child[0];
    zend_ast *cond_ast = ast->child[1];
 
    znode cond_node;
    uint32_t opnum_start, opnum_cond;
 
    zend_begin_loop(ZEND_NOP, NULL, 0);
 
    opnum_start = get_next_op_number();
    zend_compile_stmt(stmt_ast);
 
    opnum_cond = get_next_op_number();
    zend_compile_expr(&cond_node, cond_ast);
 
    zend_emit_cond_jump(ZEND_JMPNZ, &cond_node, opnum_start);
 
    zend_end_loop(opnum_cond, NULL);
}
/* }}} */
 
static void zend_compile_expr_list(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast_list *list;
    uint32_t i;
 
    result->op_type = IS_CONST;
    ZVAL_TRUE(&result->u.constant);
 
    if (!ast) {
        return;
    }
 
    list = zend_ast_get_list(ast);
    for (i = 0; i < list->children; ++i) {
        zend_ast *expr_ast = list->child[i];
 
        zend_do_free(result);
        zend_compile_expr(result, expr_ast);
    }
}
/* }}} */
 
static void zend_compile_for(zend_ast *ast) /* {{{ */
{
    zend_ast *init_ast = ast->child[0];
    zend_ast *cond_ast = ast->child[1];
    zend_ast *loop_ast = ast->child[2];
    zend_ast *stmt_ast = ast->child[3];
 
    znode result;
    uint32_t opnum_start, opnum_jmp, opnum_loop;
 
    zend_compile_expr_list(&result, init_ast);
    zend_do_free(&result);
 
    opnum_jmp = zend_emit_jump(0);
 
    zend_begin_loop(ZEND_NOP, NULL, 0);
 
    opnum_start = get_next_op_number();
    zend_compile_stmt(stmt_ast);
 
    opnum_loop = get_next_op_number();
    zend_compile_expr_list(&result, loop_ast);
    zend_do_free(&result);
 
    zend_update_jump_target_to_next(opnum_jmp);
    zend_compile_expr_list(&result, cond_ast);
    zend_do_extended_stmt();
 
    zend_emit_cond_jump(ZEND_JMPNZ, &result, opnum_start);
 
    zend_end_loop(opnum_loop, NULL);
}
/* }}} */
 
static void zend_compile_foreach(zend_ast *ast) /* {{{ */
{
    zend_ast *expr_ast = ast->child[0];
    zend_ast *value_ast = ast->child[1];
    zend_ast *key_ast = ast->child[2];
    zend_ast *stmt_ast = ast->child[3];
    bool by_ref = value_ast->kind == ZEND_AST_REF;
    bool is_variable = zend_is_variable(expr_ast) && zend_can_write_to_variable(expr_ast);
 
    znode expr_node, reset_node, value_node, key_node;
    zend_op *opline;
    uint32_t opnum_reset, opnum_fetch;
 
    if (key_ast) {
        if (key_ast->kind == ZEND_AST_REF) {
            zend_error_noreturn(E_COMPILE_ERROR, "Key element cannot be a reference");
        }
        if (key_ast->kind == ZEND_AST_ARRAY) {
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot use list as key element");
        }
    }
 
    if (by_ref) {
        value_ast = value_ast->child[0];
    }
 
    if (value_ast->kind == ZEND_AST_ARRAY && zend_propagate_list_refs(value_ast)) {
        by_ref = 1;
    }
 
    if (by_ref && is_variable) {
        zend_compile_var(&expr_node, expr_ast, BP_VAR_W, 1);
    } else {
        zend_compile_expr(&expr_node, expr_ast);
    }
 
    if (by_ref) {
        zend_separate_if_call_and_write(&expr_node, expr_ast, BP_VAR_W);
    }
 
    opnum_reset = get_next_op_number();
    opline = zend_emit_op(&reset_node, by_ref ? ZEND_FE_RESET_RW : ZEND_FE_RESET_R, &expr_node, NULL);
 
    zend_begin_loop(ZEND_FE_FREE, &reset_node, 0);
 
    opnum_fetch = get_next_op_number();
    opline = zend_emit_op(NULL, by_ref ? ZEND_FE_FETCH_RW : ZEND_FE_FETCH_R, &reset_node, NULL);
 
    if (is_this_fetch(value_ast)) {
        zend_error_noreturn(E_COMPILE_ERROR, "Cannot re-assign $this");
    } else if (value_ast->kind == ZEND_AST_VAR &&
        zend_try_compile_cv(&value_node, value_ast) == SUCCESS) {
        SET_NODE(opline->op2, &value_node);
    } else {
        opline->op2_type = IS_VAR;
        opline->op2.var = get_temporary_variable();
        GET_NODE(&value_node, opline->op2);
        if (value_ast->kind == ZEND_AST_ARRAY) {
            zend_compile_list_assign(NULL, value_ast, &value_node, value_ast->attr);
        } else if (by_ref) {
            zend_emit_assign_ref_znode(value_ast, &value_node);
        } else {
            zend_emit_assign_znode(value_ast, &value_node);
        }
    }
 
    if (key_ast) {
        opline = &CG(active_op_array)->opcodes[opnum_fetch];
        zend_make_tmp_result(&key_node, opline);
        zend_emit_assign_znode(key_ast, &key_node);
    }
 
    zend_compile_stmt(stmt_ast);
 
    /* Place JMP and FE_FREE on the line where foreach starts. It would be
     * better to use the end line, but this information is not available
     * currently. */
    CG(zend_lineno) = ast->lineno;
    zend_emit_jump(opnum_fetch);
 
    opline = &CG(active_op_array)->opcodes[opnum_reset];
    opline->op2.opline_num = get_next_op_number();
 
    opline = &CG(active_op_array)->opcodes[opnum_fetch];
    opline->extended_value = get_next_op_number();
 
    zend_end_loop(opnum_fetch, &reset_node);
 
    opline = zend_emit_op(NULL, ZEND_FE_FREE, &reset_node, NULL);
}
/* }}} */
 
static void zend_compile_if(zend_ast *ast) /* {{{ */
{
    zend_ast_list *list = zend_ast_get_list(ast);
    uint32_t i;
    uint32_t *jmp_opnums = NULL;
 
    if (list->children > 1) {
        jmp_opnums = safe_emalloc(sizeof(uint32_t), list->children - 1, 0);
    }
 
    for (i = 0; i < list->children; ++i) {
        zend_ast *elem_ast = list->child[i];
        zend_ast *cond_ast = elem_ast->child[0];
        zend_ast *stmt_ast = elem_ast->child[1];
 
        if (cond_ast) {
            znode cond_node;
            uint32_t opnum_jmpz;
 
            if (i > 0) {
                CG(zend_lineno) = cond_ast->lineno;
                zend_do_extended_stmt();
            }
 
            zend_compile_expr(&cond_node, cond_ast);
            opnum_jmpz = zend_emit_cond_jump(ZEND_JMPZ, &cond_node, 0);
 
            zend_compile_stmt(stmt_ast);
 
            if (i != list->children - 1) {
                /* Set the lineno of JMP to the position of the if keyword, as we don't want to
                 * report the last line in the if branch as covered if it hasn't actually executed. */
                CG(zend_lineno) = elem_ast->lineno;
                jmp_opnums[i] = zend_emit_jump(0);
            }
            zend_update_jump_target_to_next(opnum_jmpz);
        } else {
            /* "else" can only occur as last element. */
            ZEND_ASSERT(i == list->children - 1);
            zend_compile_stmt(stmt_ast);
        }
    }
 
    if (list->children > 1) {
        for (i = 0; i < list->children - 1; ++i) {
            zend_update_jump_target_to_next(jmp_opnums[i]);
        }
        efree(jmp_opnums);
    }
}
/* }}} */
 
static uint8_t determine_switch_jumptable_type(zend_ast_list *cases) {
    uint32_t i;
    uint8_t common_type = IS_UNDEF;
    for (i = 0; i < cases->children; i++) {
        zend_ast *case_ast = cases->child[i];
        zend_ast **cond_ast = &case_ast->child[0];
        zval *cond_zv;
        if (!case_ast->child[0]) {
            /* Skip default clause */
            continue;
        }
 
        zend_eval_const_expr(cond_ast);
        if ((*cond_ast)->kind != ZEND_AST_ZVAL) {
            /* Non-constant case */
            return IS_UNDEF;
        }
 
        cond_zv = zend_ast_get_zval(case_ast->child[0]);
        if (Z_TYPE_P(cond_zv) != IS_LONG && Z_TYPE_P(cond_zv) != IS_STRING) {
            /* We only optimize switched on integers and strings */
            return IS_UNDEF;
        }
 
        if (common_type == IS_UNDEF) {
            common_type = Z_TYPE_P(cond_zv);
        } else if (common_type != Z_TYPE_P(cond_zv)) {
            /* Non-uniform case types */
            return IS_UNDEF;
        }
 
        if (Z_TYPE_P(cond_zv) == IS_STRING
                && is_numeric_string(Z_STRVAL_P(cond_zv), Z_STRLEN_P(cond_zv), NULL, NULL, 0)) {
            /* Numeric strings cannot be compared with a simple hash lookup */
            return IS_UNDEF;
        }
    }
 
    return common_type;
}
 
static bool should_use_jumptable(zend_ast_list *cases, uint8_t jumptable_type) {
    if (CG(compiler_options) & ZEND_COMPILE_NO_JUMPTABLES) {
        return 0;
    }
 
    /* Thresholds are chosen based on when the average switch time for equidistributed
     * input becomes smaller when using the jumptable optimization. */
    if (jumptable_type == IS_LONG) {
        return cases->children >= 5;
    } else {
        ZEND_ASSERT(jumptable_type == IS_STRING);
        return cases->children >= 2;
    }
}
 
static void zend_compile_switch(zend_ast *ast) /* {{{ */
{
    zend_ast *expr_ast = ast->child[0];
    zend_ast_list *cases = zend_ast_get_list(ast->child[1]);
 
    uint32_t i;
    bool has_default_case = 0;
 
    znode expr_node, case_node;
    zend_op *opline;
    uint32_t *jmpnz_opnums, opnum_default_jmp, opnum_switch = (uint32_t)-1;
    uint8_t jumptable_type;
    HashTable *jumptable = NULL;
 
    zend_compile_expr(&expr_node, expr_ast);
 
    zend_begin_loop(ZEND_FREE, &expr_node, 1);
 
    case_node.op_type = IS_TMP_VAR;
    case_node.u.op.var = get_temporary_variable();
 
    jumptable_type = determine_switch_jumptable_type(cases);
    if (jumptable_type != IS_UNDEF && should_use_jumptable(cases, jumptable_type)) {
        znode jumptable_op;
 
        ALLOC_HASHTABLE(jumptable);
        zend_hash_init(jumptable, cases->children, NULL, NULL, 0);
        jumptable_op.op_type = IS_CONST;
        ZVAL_ARR(&jumptable_op.u.constant, jumptable);
 
        opline = zend_emit_op(NULL,
            jumptable_type == IS_LONG ? ZEND_SWITCH_LONG : ZEND_SWITCH_STRING,
            &expr_node, &jumptable_op);
        if (opline->op1_type == IS_CONST) {
            Z_TRY_ADDREF_P(CT_CONSTANT(opline->op1));
        }
        opnum_switch = opline - CG(active_op_array)->opcodes;
    }
 
    jmpnz_opnums = safe_emalloc(sizeof(uint32_t), cases->children, 0);
    for (i = 0; i < cases->children; ++i) {
        zend_ast *case_ast = cases->child[i];
        zend_ast *cond_ast = case_ast->child[0];
        znode cond_node;
 
        if (!cond_ast) {
            if (has_default_case) {
                CG(zend_lineno) = case_ast->lineno;
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Switch statements may only contain one default clause");
            }
            has_default_case = 1;
            continue;
        }
 
        zend_compile_expr(&cond_node, cond_ast);
 
        if (expr_node.op_type == IS_CONST
            && Z_TYPE(expr_node.u.constant) == IS_FALSE) {
            jmpnz_opnums[i] = zend_emit_cond_jump(ZEND_JMPZ, &cond_node, 0);
        } else if (expr_node.op_type == IS_CONST
            && Z_TYPE(expr_node.u.constant) == IS_TRUE) {
            jmpnz_opnums[i] = zend_emit_cond_jump(ZEND_JMPNZ, &cond_node, 0);
        } else {
            opline = zend_emit_op(NULL,
                (expr_node.op_type & (IS_VAR|IS_TMP_VAR)) ? ZEND_CASE : ZEND_IS_EQUAL,
                &expr_node, &cond_node);
            SET_NODE(opline->result, &case_node);
            if (opline->op1_type == IS_CONST) {
                Z_TRY_ADDREF_P(CT_CONSTANT(opline->op1));
            }
 
            jmpnz_opnums[i] = zend_emit_cond_jump(ZEND_JMPNZ, &case_node, 0);
        }
    }
 
    opnum_default_jmp = zend_emit_jump(0);
 
    for (i = 0; i < cases->children; ++i) {
        zend_ast *case_ast = cases->child[i];
        zend_ast *cond_ast = case_ast->child[0];
        zend_ast *stmt_ast = case_ast->child[1];
 
        if (cond_ast) {
            zend_update_jump_target_to_next(jmpnz_opnums[i]);
 
            if (jumptable) {
                zval *cond_zv = zend_ast_get_zval(cond_ast);
                zval jmp_target;
                ZVAL_LONG(&jmp_target, get_next_op_number());
 
                ZEND_ASSERT(Z_TYPE_P(cond_zv) == jumptable_type);
                if (Z_TYPE_P(cond_zv) == IS_LONG) {
                    zend_hash_index_add(jumptable, Z_LVAL_P(cond_zv), &jmp_target);
                } else {
                    ZEND_ASSERT(Z_TYPE_P(cond_zv) == IS_STRING);
                    zend_hash_add(jumptable, Z_STR_P(cond_zv), &jmp_target);
                }
            }
        } else {
            zend_update_jump_target_to_next(opnum_default_jmp);
 
            if (jumptable) {
                ZEND_ASSERT(opnum_switch != (uint32_t)-1);
                opline = &CG(active_op_array)->opcodes[opnum_switch];
                opline->extended_value = get_next_op_number();
            }
        }
 
        zend_compile_stmt(stmt_ast);
    }
 
    if (!has_default_case) {
        zend_update_jump_target_to_next(opnum_default_jmp);
 
        if (jumptable) {
            opline = &CG(active_op_array)->opcodes[opnum_switch];
            opline->extended_value = get_next_op_number();
        }
    }
 
    zend_end_loop(get_next_op_number(), &expr_node);
 
    if (expr_node.op_type & (IS_VAR|IS_TMP_VAR)) {
        opline = zend_emit_op(NULL, ZEND_FREE, &expr_node, NULL);
        opline->extended_value = ZEND_FREE_SWITCH;
    } else if (expr_node.op_type == IS_CONST) {
        zval_ptr_dtor_nogc(&expr_node.u.constant);
    }
 
    efree(jmpnz_opnums);
}
/* }}} */
 
static uint32_t count_match_conds(zend_ast_list *arms)
{
    uint32_t num_conds = 0;
 
    for (uint32_t i = 0; i < arms->children; i++) {
        zend_ast *arm_ast = arms->child[i];
        if (arm_ast->child[0] == NULL) {
            continue;
        }
 
        zend_ast_list *conds = zend_ast_get_list(arm_ast->child[0]);
        num_conds += conds->children;
    }
 
    return num_conds;
}
 
static bool can_match_use_jumptable(zend_ast_list *arms) {
    for (uint32_t i = 0; i < arms->children; i++) {
        zend_ast *arm_ast = arms->child[i];
        if (!arm_ast->child[0]) {
            /* Skip default arm */
            continue;
        }
 
        zend_ast_list *conds = zend_ast_get_list(arm_ast->child[0]);
        for (uint32_t j = 0; j < conds->children; j++) {
            zend_ast **cond_ast = &conds->child[j];
 
            zend_eval_const_expr(cond_ast);
            if ((*cond_ast)->kind != ZEND_AST_ZVAL) {
                return 0;
            }
 
            zval *cond_zv = zend_ast_get_zval(*cond_ast);
            if (Z_TYPE_P(cond_zv) != IS_LONG && Z_TYPE_P(cond_zv) != IS_STRING) {
                return 0;
            }
        }
    }
 
    return 1;
}
 
static void zend_compile_match(znode *result, zend_ast *ast)
{
    zend_ast *expr_ast = ast->child[0];
    zend_ast_list *arms = zend_ast_get_list(ast->child[1]);
    bool has_default_arm = 0;
    uint32_t opnum_match = (uint32_t)-1;
 
    znode expr_node;
    zend_compile_expr(&expr_node, expr_ast);
 
    znode case_node;
    case_node.op_type = IS_TMP_VAR;
    case_node.u.op.var = get_temporary_variable();
 
    uint32_t num_conds = count_match_conds(arms);
    uint8_t can_use_jumptable = can_match_use_jumptable(arms);
    bool uses_jumptable = can_use_jumptable && num_conds >= 2;
    HashTable *jumptable = NULL;
    uint32_t *jmpnz_opnums = NULL;
 
    for (uint32_t i = 0; i < arms->children; ++i) {
        zend_ast *arm_ast = arms->child[i];
 
        if (!arm_ast->child[0]) {
            if (has_default_arm) {
                CG(zend_lineno) = arm_ast->lineno;
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Match expressions may only contain one default arm");
            }
            has_default_arm = 1;
        }
    }
 
    if (uses_jumptable) {
        znode jumptable_op;
 
        ALLOC_HASHTABLE(jumptable);
        zend_hash_init(jumptable, num_conds, NULL, NULL, 0);
        jumptable_op.op_type = IS_CONST;
        ZVAL_ARR(&jumptable_op.u.constant, jumptable);
 
        zend_op *opline = zend_emit_op(NULL, ZEND_MATCH, &expr_node, &jumptable_op);
        if (opline->op1_type == IS_CONST) {
            Z_TRY_ADDREF_P(CT_CONSTANT(opline->op1));
        }
        opnum_match = opline - CG(active_op_array)->opcodes;
    } else {
        jmpnz_opnums = safe_emalloc(sizeof(uint32_t), num_conds, 0);
        uint32_t cond_count = 0;
        for (uint32_t i = 0; i < arms->children; ++i) {
            zend_ast *arm_ast = arms->child[i];
 
            if (!arm_ast->child[0]) {
                continue;
            }
 
            zend_ast_list *conds = zend_ast_get_list(arm_ast->child[0]);
            for (uint32_t j = 0; j < conds->children; j++) {
                zend_ast *cond_ast = conds->child[j];
 
                znode cond_node;
                zend_compile_expr(&cond_node, cond_ast);
 
                uint32_t opcode = (expr_node.op_type & (IS_VAR|IS_TMP_VAR)) ? ZEND_CASE_STRICT : ZEND_IS_IDENTICAL;
                zend_op *opline = zend_emit_op(NULL, opcode, &expr_node, &cond_node);
                SET_NODE(opline->result, &case_node);
                if (opline->op1_type == IS_CONST) {
                    Z_TRY_ADDREF_P(CT_CONSTANT(opline->op1));
                }
 
                jmpnz_opnums[cond_count] = zend_emit_cond_jump(ZEND_JMPNZ, &case_node, 0);
 
                cond_count++;
            }
        }
    }
 
    uint32_t opnum_default_jmp = 0;
    if (!uses_jumptable) {
        opnum_default_jmp = zend_emit_jump(0);
    }
 
    bool is_first_case = 1;
    uint32_t cond_count = 0;
    uint32_t *jmp_end_opnums = safe_emalloc(sizeof(uint32_t), arms->children, 0);
 
    // The generated default arm is emitted first to avoid live range issues where the tmpvar
    // for the arm result is freed even though it has not been initialized yet.
    if (!has_default_arm) {
        if (!uses_jumptable) {
            zend_update_jump_target_to_next(opnum_default_jmp);
        }
 
        if (jumptable) {
            zend_op *opline = &CG(active_op_array)->opcodes[opnum_match];
            opline->extended_value = get_next_op_number();
        }
 
        zend_op *opline = zend_emit_op(NULL, ZEND_MATCH_ERROR, &expr_node, NULL);
        if (opline->op1_type == IS_CONST) {
            Z_TRY_ADDREF_P(CT_CONSTANT(opline->op1));
        }
        if (arms->children == 0) {
            /* Mark this as an "expression throw" for opcache. */
            opline->extended_value = ZEND_THROW_IS_EXPR;
        }
    }
 
    for (uint32_t i = 0; i < arms->children; ++i) {
        zend_ast *arm_ast = arms->child[i];
        zend_ast *body_ast = arm_ast->child[1];
 
        if (arm_ast->child[0] != NULL) {
            zend_ast_list *conds = zend_ast_get_list(arm_ast->child[0]);
 
            for (uint32_t j = 0; j < conds->children; j++) {
                zend_ast *cond_ast = conds->child[j];
 
                if (jmpnz_opnums != NULL) {
                    zend_update_jump_target_to_next(jmpnz_opnums[cond_count]);
                }
 
                if (jumptable) {
                    zval *cond_zv = zend_ast_get_zval(cond_ast);
                    zval jmp_target;
                    ZVAL_LONG(&jmp_target, get_next_op_number());
 
                    if (Z_TYPE_P(cond_zv) == IS_LONG) {
                        zend_hash_index_add(jumptable, Z_LVAL_P(cond_zv), &jmp_target);
                    } else {
                        ZEND_ASSERT(Z_TYPE_P(cond_zv) == IS_STRING);
                        zend_hash_add(jumptable, Z_STR_P(cond_zv), &jmp_target);
                    }
                }
 
                cond_count++;
            }
        } else {
            if (!uses_jumptable) {
                zend_update_jump_target_to_next(opnum_default_jmp);
            }
 
            if (jumptable) {
                ZEND_ASSERT(opnum_match != (uint32_t)-1);
                zend_op *opline = &CG(active_op_array)->opcodes[opnum_match];
                opline->extended_value = get_next_op_number();
            }
        }
 
        znode body_node;
        zend_compile_expr(&body_node, body_ast);
 
        if (is_first_case) {
            zend_emit_op_tmp(result, ZEND_QM_ASSIGN, &body_node, NULL);
            is_first_case = 0;
        } else {
            zend_op *opline_qm_assign = zend_emit_op(NULL, ZEND_QM_ASSIGN, &body_node, NULL);
            SET_NODE(opline_qm_assign->result, result);
        }
 
        jmp_end_opnums[i] = zend_emit_jump(0);
    }
 
    // Initialize result in case there is no arm
    if (arms->children == 0) {
        result->op_type = IS_CONST;
        ZVAL_NULL(&result->u.constant);
    }
 
    for (uint32_t i = 0; i < arms->children; ++i) {
        zend_update_jump_target_to_next(jmp_end_opnums[i]);
    }
 
    if (expr_node.op_type & (IS_VAR|IS_TMP_VAR)) {
        zend_op *opline = zend_emit_op(NULL, ZEND_FREE, &expr_node, NULL);
        opline->extended_value = ZEND_FREE_SWITCH;
    } else if (expr_node.op_type == IS_CONST) {
        zval_ptr_dtor_nogc(&expr_node.u.constant);
    }
 
    if (jmpnz_opnums != NULL) {
        efree(jmpnz_opnums);
    }
    efree(jmp_end_opnums);
}
 
static void zend_compile_try(zend_ast *ast) /* {{{ */
{
    zend_ast *try_ast = ast->child[0];
    zend_ast_list *catches = zend_ast_get_list(ast->child[1]);
    zend_ast *finally_ast = ast->child[2];
 
    uint32_t i, j;
    zend_op *opline;
    uint32_t try_catch_offset;
    uint32_t *jmp_opnums = safe_emalloc(sizeof(uint32_t), catches->children, 0);
    uint32_t orig_fast_call_var = CG(context).fast_call_var;
    uint32_t orig_try_catch_offset = CG(context).try_catch_offset;
 
    if (catches->children == 0 && !finally_ast) {
        zend_error_noreturn(E_COMPILE_ERROR, "Cannot use try without catch or finally");
    }
 
    /* label: try { } must not be equal to try { label: } */
    if (CG(context).labels) {
        zend_label *label;
        ZEND_HASH_MAP_REVERSE_FOREACH_PTR(CG(context).labels, label) {
            if (label->opline_num == get_next_op_number()) {
                zend_emit_op(NULL, ZEND_NOP, NULL, NULL);
            }
            break;
        } ZEND_HASH_FOREACH_END();
    }
 
    try_catch_offset = zend_add_try_element(get_next_op_number());
 
    if (finally_ast) {
        zend_loop_var fast_call;
        if (!(CG(active_op_array)->fn_flags & ZEND_ACC_HAS_FINALLY_BLOCK)) {
            CG(active_op_array)->fn_flags |= ZEND_ACC_HAS_FINALLY_BLOCK;
        }
        CG(context).fast_call_var = get_temporary_variable();
 
        /* Push FAST_CALL on unwind stack */
        fast_call.opcode = ZEND_FAST_CALL;
        fast_call.var_type = IS_TMP_VAR;
        fast_call.var_num = CG(context).fast_call_var;
        fast_call.try_catch_offset = try_catch_offset;
        zend_stack_push(&CG(loop_var_stack), &fast_call);
    }
 
    CG(context).try_catch_offset = try_catch_offset;
 
    zend_compile_stmt(try_ast);
 
    if (catches->children != 0) {
        jmp_opnums[0] = zend_emit_jump(0);
    }
 
    for (i = 0; i < catches->children; ++i) {
        zend_ast *catch_ast = catches->child[i];
        zend_ast_list *classes = zend_ast_get_list(catch_ast->child[0]);
        zend_ast *var_ast = catch_ast->child[1];
        zend_ast *stmt_ast = catch_ast->child[2];
        zend_string *var_name = var_ast ? zval_make_interned_string(zend_ast_get_zval(var_ast)) : NULL;
        bool is_last_catch = (i + 1 == catches->children);
 
        uint32_t *jmp_multicatch = safe_emalloc(sizeof(uint32_t), classes->children - 1, 0);
        uint32_t opnum_catch = (uint32_t)-1;
 
        CG(zend_lineno) = catch_ast->lineno;
 
        for (j = 0; j < classes->children; j++) {
            zend_ast *class_ast = classes->child[j];
            bool is_last_class = (j + 1 == classes->children);
 
            if (!zend_is_const_default_class_ref(class_ast)) {
                zend_error_noreturn(E_COMPILE_ERROR, "Bad class name in the catch statement");
            }
 
            opnum_catch = get_next_op_number();
            if (i == 0 && j == 0) {
                CG(active_op_array)->try_catch_array[try_catch_offset].catch_op = opnum_catch;
            }
 
            opline = get_next_op();
            opline->opcode = ZEND_CATCH;
            opline->op1_type = IS_CONST;
            opline->op1.constant = zend_add_class_name_literal(
                    zend_resolve_class_name_ast(class_ast));
            opline->extended_value = zend_alloc_cache_slot();
 
            if (var_name && zend_string_equals(var_name, ZSTR_KNOWN(ZEND_STR_THIS))) {
                zend_error_noreturn(E_COMPILE_ERROR, "Cannot re-assign $this");
            }
 
            opline->result_type = var_name ? IS_CV : IS_UNUSED;
            opline->result.var = var_name ? lookup_cv(var_name) : -1;
 
            if (is_last_catch && is_last_class) {
                opline->extended_value |= ZEND_LAST_CATCH;
            }
 
            if (!is_last_class) {
                jmp_multicatch[j] = zend_emit_jump(0);
                opline = &CG(active_op_array)->opcodes[opnum_catch];
                opline->op2.opline_num = get_next_op_number();
            }
        }
 
        for (j = 0; j < classes->children - 1; j++) {
            zend_update_jump_target_to_next(jmp_multicatch[j]);
        }
 
        efree(jmp_multicatch);
 
        zend_compile_stmt(stmt_ast);
 
        if (!is_last_catch) {
            jmp_opnums[i + 1] = zend_emit_jump(0);
        }
 
        ZEND_ASSERT(opnum_catch != (uint32_t)-1 && "Should have at least one class");
        opline = &CG(active_op_array)->opcodes[opnum_catch];
        if (!is_last_catch) {
            opline->op2.opline_num = get_next_op_number();
        }
    }
 
    for (i = 0; i < catches->children; ++i) {
        zend_update_jump_target_to_next(jmp_opnums[i]);
    }
 
    if (finally_ast) {
        zend_loop_var discard_exception;
        uint32_t opnum_jmp = get_next_op_number() + 1;
 
        /* Pop FAST_CALL from unwind stack */
        zend_stack_del_top(&CG(loop_var_stack));
 
        /* Push DISCARD_EXCEPTION on unwind stack */
        discard_exception.opcode = ZEND_DISCARD_EXCEPTION;
        discard_exception.var_type = IS_TMP_VAR;
        discard_exception.var_num = CG(context).fast_call_var;
        zend_stack_push(&CG(loop_var_stack), &discard_exception);
 
        CG(zend_lineno) = finally_ast->lineno;
 
        opline = zend_emit_op(NULL, ZEND_FAST_CALL, NULL, NULL);
        opline->op1.num = try_catch_offset;
        opline->result_type = IS_TMP_VAR;
        opline->result.var = CG(context).fast_call_var;
 
        zend_emit_op(NULL, ZEND_JMP, NULL, NULL);
 
        zend_compile_stmt(finally_ast);
 
        CG(active_op_array)->try_catch_array[try_catch_offset].finally_op = opnum_jmp + 1;
        CG(active_op_array)->try_catch_array[try_catch_offset].finally_end
            = get_next_op_number();
 
        opline = zend_emit_op(NULL, ZEND_FAST_RET, NULL, NULL);
        opline->op1_type = IS_TMP_VAR;
        opline->op1.var = CG(context).fast_call_var;
        opline->op2.num = orig_try_catch_offset;
 
        zend_update_jump_target_to_next(opnum_jmp);
 
        CG(context).fast_call_var = orig_fast_call_var;
 
        /* Pop DISCARD_EXCEPTION from unwind stack */
        zend_stack_del_top(&CG(loop_var_stack));
    }
 
    CG(context).try_catch_offset = orig_try_catch_offset;
 
    efree(jmp_opnums);
}
/* }}} */
 
/* Encoding declarations must already be handled during parsing */
bool zend_handle_encoding_declaration(zend_ast *ast) /* {{{ */
{
    zend_ast_list *declares = zend_ast_get_list(ast);
    uint32_t i;
    for (i = 0; i < declares->children; ++i) {
        zend_ast *declare_ast = declares->child[i];
        zend_ast *name_ast = declare_ast->child[0];
        zend_ast *value_ast = declare_ast->child[1];
        zend_string *name = zend_ast_get_str(name_ast);
 
        if (zend_string_equals_literal_ci(name, "encoding")) {
            if (value_ast->kind != ZEND_AST_ZVAL) {
                zend_throw_exception(zend_ce_compile_error, "Encoding must be a literal", 0);
                return 0;
            }
 
            if (CG(multibyte)) {
                zend_string *encoding_name = zval_get_string(zend_ast_get_zval(value_ast));
 
                const zend_encoding *new_encoding, *old_encoding;
                zend_encoding_filter old_input_filter;
 
                CG(encoding_declared) = 1;
 
                new_encoding = zend_multibyte_fetch_encoding(ZSTR_VAL(encoding_name));
                if (!new_encoding) {
                    zend_error(E_COMPILE_WARNING, "Unsupported encoding [%s]", ZSTR_VAL(encoding_name));
                } else {
                    old_input_filter = LANG_SCNG(input_filter);
                    old_encoding = LANG_SCNG(script_encoding);
                    zend_multibyte_set_filter(new_encoding);
 
                    /* need to re-scan if input filter changed */
                    if (old_input_filter != LANG_SCNG(input_filter) ||
                         (old_input_filter && new_encoding != old_encoding)) {
                        zend_multibyte_yyinput_again(old_input_filter, old_encoding);
                    }
                }
 
                zend_string_release_ex(encoding_name, 0);
            } else {
                zend_error(E_COMPILE_WARNING, "declare(encoding=...) ignored because "
                    "Zend multibyte feature is turned off by settings");
            }
        }
    }
 
    return 1;
}
/* }}} */
 
/* Check whether this is the first statement, not counting declares. */
static zend_result zend_is_first_statement(zend_ast *ast, bool allow_nop) /* {{{ */
{
    uint32_t i = 0;
    zend_ast_list *file_ast = zend_ast_get_list(CG(ast));
 
    while (i < file_ast->children) {
        if (file_ast->child[i] == ast) {
            return SUCCESS;
        } else if (file_ast->child[i] == NULL) {
            if (!allow_nop) {
                return FAILURE;
            }
        } else if (file_ast->child[i]->kind != ZEND_AST_DECLARE) {
            return FAILURE;
        }
        i++;
    }
    return FAILURE;
}
/* }}} */
 
static void zend_compile_declare(zend_ast *ast) /* {{{ */
{
    zend_ast_list *declares = zend_ast_get_list(ast->child[0]);
    zend_ast *stmt_ast = ast->child[1];
    zend_declarables orig_declarables = FC(declarables);
    uint32_t i;
 
    for (i = 0; i < declares->children; ++i) {
        zend_ast *declare_ast = declares->child[i];
        zend_ast *name_ast = declare_ast->child[0];
        zend_ast **value_ast_ptr = &declare_ast->child[1];
        zend_string *name = zend_ast_get_str(name_ast);
 
        if ((*value_ast_ptr)->kind != ZEND_AST_ZVAL) {
            zend_error_noreturn(E_COMPILE_ERROR, "declare(%s) value must be a literal", ZSTR_VAL(name));
        }
 
        if (zend_string_equals_literal_ci(name, "ticks")) {
            zval value_zv;
            zend_const_expr_to_zval(&value_zv, value_ast_ptr, /* allow_dynamic */ false);
            FC(declarables).ticks = zval_get_long(&value_zv);
            zval_ptr_dtor_nogc(&value_zv);
        } else if (zend_string_equals_literal_ci(name, "encoding")) {
 
            if (FAILURE == zend_is_first_statement(ast, /* allow_nop */ 0)) {
                zend_error_noreturn(E_COMPILE_ERROR, "Encoding declaration pragma must be "
                    "the very first statement in the script");
            }
        } else if (zend_string_equals_literal_ci(name, "strict_types")) {
            zval value_zv;
 
            if (FAILURE == zend_is_first_statement(ast, /* allow_nop */ 0)) {
                zend_error_noreturn(E_COMPILE_ERROR, "strict_types declaration must be "
                    "the very first statement in the script");
            }
 
            if (ast->child[1] != NULL) {
                zend_error_noreturn(E_COMPILE_ERROR, "strict_types declaration must not "
                    "use block mode");
            }
 
            zend_const_expr_to_zval(&value_zv, value_ast_ptr, /* allow_dynamic */ false);
 
            if (Z_TYPE(value_zv) != IS_LONG || (Z_LVAL(value_zv) != 0 && Z_LVAL(value_zv) != 1)) {
                zend_error_noreturn(E_COMPILE_ERROR, "strict_types declaration must have 0 or 1 as its value");
            }
 
            if (Z_LVAL(value_zv) == 1) {
                CG(active_op_array)->fn_flags |= ZEND_ACC_STRICT_TYPES;
            }
 
        } else {
            zend_error(E_COMPILE_WARNING, "Unsupported declare '%s'", ZSTR_VAL(name));
        }
    }
 
    if (stmt_ast) {
        zend_compile_stmt(stmt_ast);
 
        FC(declarables) = orig_declarables;
    }
}
/* }}} */
 
static void zend_compile_stmt_list(zend_ast *ast) /* {{{ */
{
    zend_ast_list *list = zend_ast_get_list(ast);
    uint32_t i;
    for (i = 0; i < list->children; ++i) {
        zend_compile_stmt(list->child[i]);
    }
}
/* }}} */
 
ZEND_API void zend_set_function_arg_flags(zend_function *func) /* {{{ */
{
    uint32_t i, n;
 
    func->common.arg_flags[0] = 0;
    func->common.arg_flags[1] = 0;
    func->common.arg_flags[2] = 0;
    if (func->common.arg_info) {
        n = MIN(func->common.num_args, MAX_ARG_FLAG_NUM);
        i = 0;
        while (i < n) {
            ZEND_SET_ARG_FLAG(func, i + 1, ZEND_ARG_SEND_MODE(&func->common.arg_info[i]));
            i++;
        }
        if (UNEXPECTED((func->common.fn_flags & ZEND_ACC_VARIADIC) && ZEND_ARG_SEND_MODE(&func->common.arg_info[i]))) {
            uint32_t pass_by_reference = ZEND_ARG_SEND_MODE(&func->common.arg_info[i]);
            while (i < MAX_ARG_FLAG_NUM) {
                ZEND_SET_ARG_FLAG(func, i + 1, pass_by_reference);
                i++;
            }
        }
    }
}
/* }}} */
 
static zend_type zend_compile_single_typename(zend_ast *ast)
{
    ZEND_ASSERT(!(ast->attr & ZEND_TYPE_NULLABLE));
    if (ast->kind == ZEND_AST_TYPE) {
        if (ast->attr == IS_STATIC && !CG(active_class_entry) && zend_is_scope_known()) {
            zend_error_noreturn(E_COMPILE_ERROR,
                "Cannot use \"static\" when no class scope is active");
        }
 
        return (zend_type) ZEND_TYPE_INIT_CODE(ast->attr, 0, 0);
    } else {
        zend_string *class_name = zend_ast_get_str(ast);
        uint8_t type_code = zend_lookup_builtin_type_by_name(class_name);
 
        if (type_code != 0) {
            if ((ast->attr & ZEND_NAME_NOT_FQ) != ZEND_NAME_NOT_FQ) {
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Type declaration '%s' must be unqualified",
                    ZSTR_VAL(zend_string_tolower(class_name)));
            }
 
            /* Transform iterable into a type union alias */
            if (type_code == IS_ITERABLE) {
                /* Set iterable bit for BC compat during Reflection and string representation of type */
                zend_type iterable = (zend_type) ZEND_TYPE_INIT_CLASS_MASK(ZSTR_KNOWN(ZEND_STR_TRAVERSABLE),
                    (MAY_BE_ARRAY|_ZEND_TYPE_ITERABLE_BIT));
                return iterable;
            }
 
            return (zend_type) ZEND_TYPE_INIT_CODE(type_code, 0, 0);
        } else {
            const char *correct_name;
            zend_string *orig_name = zend_ast_get_str(ast);
            uint32_t fetch_type = zend_get_class_fetch_type_ast(ast);
            if (fetch_type == ZEND_FETCH_CLASS_DEFAULT) {
                class_name = zend_resolve_class_name_ast(ast);
                zend_assert_valid_class_name(class_name, "a type name");
            } else {
                zend_ensure_valid_class_fetch_type(fetch_type);
                zend_string_addref(class_name);
            }
 
            if (ast->attr == ZEND_NAME_NOT_FQ
                    && zend_is_confusable_type(orig_name, &correct_name)
                    && zend_is_not_imported(orig_name)) {
                const char *extra =
                    FC(current_namespace) ? " or import the class with \"use\"" : "";
                if (correct_name) {
                    zend_error(E_COMPILE_WARNING,
                        "\"%s\" will be interpreted as a class name. Did you mean \"%s\"? "
                        "Write \"\\%s\"%s to suppress this warning",
                        ZSTR_VAL(orig_name), correct_name, ZSTR_VAL(class_name), extra);
                } else {
                    zend_error(E_COMPILE_WARNING,
                        "\"%s\" is not a supported builtin type "
                        "and will be interpreted as a class name. "
                        "Write \"\\%s\"%s to suppress this warning",
                        ZSTR_VAL(orig_name), ZSTR_VAL(class_name), extra);
                }
            }
 
            class_name = zend_new_interned_string(class_name);
            zend_alloc_ce_cache(class_name);
            return (zend_type) ZEND_TYPE_INIT_CLASS(class_name, 0, 0);
        }
    }
}
 
static void zend_are_intersection_types_redundant(zend_type left_type, zend_type right_type)
{
    ZEND_ASSERT(ZEND_TYPE_IS_INTERSECTION(left_type));
    ZEND_ASSERT(ZEND_TYPE_IS_INTERSECTION(right_type));
    zend_type_list *l_type_list = ZEND_TYPE_LIST(left_type);
    zend_type_list *r_type_list = ZEND_TYPE_LIST(right_type);
    zend_type_list *smaller_type_list, *larger_type_list;
    bool flipped = false;
 
    if (r_type_list->num_types < l_type_list->num_types) {
        smaller_type_list = r_type_list;
        larger_type_list = l_type_list;
        flipped = true;
    } else {
        smaller_type_list = l_type_list;
        larger_type_list = r_type_list;
    }
 
    unsigned int sum = 0;
    zend_type *outer_type;
    ZEND_TYPE_LIST_FOREACH(smaller_type_list, outer_type)
        zend_type *inner_type;
        ZEND_TYPE_LIST_FOREACH(larger_type_list, inner_type)
            if (zend_string_equals_ci(ZEND_TYPE_NAME(*inner_type), ZEND_TYPE_NAME(*outer_type))) {
                sum++;
                break;
            }
        ZEND_TYPE_LIST_FOREACH_END();
    ZEND_TYPE_LIST_FOREACH_END();
 
    if (sum == smaller_type_list->num_types) {
        zend_string *smaller_type_str;
        zend_string *larger_type_str;
        if (flipped) {
            smaller_type_str = zend_type_to_string(right_type);
            larger_type_str = zend_type_to_string(left_type);
        } else {
            smaller_type_str = zend_type_to_string(left_type);
            larger_type_str = zend_type_to_string(right_type);
        }
        if (smaller_type_list->num_types == larger_type_list->num_types) {
            zend_error_noreturn(E_COMPILE_ERROR, "Type %s is redundant with type %s",
                ZSTR_VAL(smaller_type_str), ZSTR_VAL(larger_type_str));
        } else {
            zend_error_noreturn(E_COMPILE_ERROR, "Type %s is redundant as it is more restrictive than type %s",
                ZSTR_VAL(larger_type_str), ZSTR_VAL(smaller_type_str));
        }
    }
}
 
static void zend_is_intersection_type_redundant_by_single_type(zend_type intersection_type, zend_type single_type)
{
    ZEND_ASSERT(ZEND_TYPE_IS_INTERSECTION(intersection_type));
    ZEND_ASSERT(!ZEND_TYPE_IS_INTERSECTION(single_type));
 
    zend_type *single_intersection_type = NULL;
    ZEND_TYPE_FOREACH(intersection_type, single_intersection_type)
        if (zend_string_equals_ci(ZEND_TYPE_NAME(*single_intersection_type), ZEND_TYPE_NAME(single_type))) {
            zend_string *single_type_str = zend_type_to_string(single_type);
            zend_string *complete_type = zend_type_to_string(intersection_type);
            zend_error_noreturn(E_COMPILE_ERROR, "Type %s is redundant as it is more restrictive than type %s",
                    ZSTR_VAL(complete_type), ZSTR_VAL(single_type_str));
        }
    ZEND_TYPE_FOREACH_END();
}
 
/* Used by both intersection and union types prior to transforming the type list to a full zend_type */
static void zend_is_type_list_redundant_by_single_type(zend_type_list *type_list, zend_type type)
{
    ZEND_ASSERT(!ZEND_TYPE_IS_INTERSECTION(type));
    for (size_t i = 0; i < type_list->num_types - 1; i++) {
        if (ZEND_TYPE_IS_INTERSECTION(type_list->types[i])) {
            zend_is_intersection_type_redundant_by_single_type(type_list->types[i], type);
            continue;
        }
        if (zend_string_equals_ci(ZEND_TYPE_NAME(type_list->types[i]), ZEND_TYPE_NAME(type))) {
            zend_string *single_type_str = zend_type_to_string(type);
            zend_error_noreturn(E_COMPILE_ERROR, "Duplicate type %s is redundant", ZSTR_VAL(single_type_str));
        }
    }
}
 
static zend_type zend_compile_typename(zend_ast *ast);
 
static zend_type zend_compile_typename_ex(
        zend_ast *ast, bool force_allow_null, bool *forced_allow_null) /* {{{ */
{
    bool is_marked_nullable = ast->attr & ZEND_TYPE_NULLABLE;
    zend_ast_attr orig_ast_attr = ast->attr;
    zend_type type = ZEND_TYPE_INIT_NONE(0);
 
    if (is_marked_nullable) {
        ast->attr &= ~ZEND_TYPE_NULLABLE;
    }
 
    if (ast->kind == ZEND_AST_TYPE_UNION) {
        zend_ast_list *list = zend_ast_get_list(ast);
        zend_type_list *type_list;
        bool is_composite = false;
        bool has_only_iterable_class = true;
        ALLOCA_FLAG(use_heap)
 
        type_list = do_alloca(ZEND_TYPE_LIST_SIZE(list->children), use_heap);
        type_list->num_types = 0;
 
        for (uint32_t i = 0; i < list->children; i++) {
            zend_ast *type_ast = list->child[i];
            zend_type single_type;
            uint32_t type_mask = ZEND_TYPE_FULL_MASK(type);
 
            if (type_ast->kind == ZEND_AST_TYPE_INTERSECTION) {
                has_only_iterable_class = false;
                is_composite = true;
                /* The first class type can be stored directly as the type ptr payload. */
                if (ZEND_TYPE_IS_COMPLEX(type) && !ZEND_TYPE_HAS_LIST(type)) {
                    /* Switch from single name to name list. */
                    type_list->num_types = 1;
                    type_list->types[0] = type;
                    ZEND_TYPE_FULL_MASK(type_list->types[0]) &= ~_ZEND_TYPE_MAY_BE_MASK;
                }
                /* Mark type as list type */
                ZEND_TYPE_SET_LIST(type, type_list);
 
                single_type = zend_compile_typename(type_ast);
                ZEND_ASSERT(ZEND_TYPE_IS_INTERSECTION(single_type));
 
                type_list->types[type_list->num_types++] = single_type;
 
                /* Check for trivially redundant class types */
                for (size_t i = 0; i < type_list->num_types - 1; i++) {
                    if (ZEND_TYPE_IS_INTERSECTION(type_list->types[i])) {
                        zend_are_intersection_types_redundant(single_type, type_list->types[i]);
                        continue;
                    }
                    /* Type from type list is a simple type */
                    zend_is_intersection_type_redundant_by_single_type(single_type, type_list->types[i]);
                }
                continue;
            }
 
            single_type = zend_compile_single_typename(type_ast);
            uint32_t single_type_mask = ZEND_TYPE_PURE_MASK(single_type);
 
            if (single_type_mask == MAY_BE_ANY) {
                zend_error_noreturn(E_COMPILE_ERROR, "Type mixed can only be used as a standalone type");
            }
            if (ZEND_TYPE_IS_COMPLEX(single_type) && !ZEND_TYPE_IS_ITERABLE_FALLBACK(single_type)) {
                has_only_iterable_class = false;
            }
 
            uint32_t type_mask_overlap = ZEND_TYPE_PURE_MASK(type) & single_type_mask;
            if (type_mask_overlap) {
                zend_type overlap_type = ZEND_TYPE_INIT_MASK(type_mask_overlap);
                zend_string *overlap_type_str = zend_type_to_string(overlap_type);
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Duplicate type %s is redundant", ZSTR_VAL(overlap_type_str));
            }
 
            if ( ((type_mask & MAY_BE_TRUE) && (single_type_mask == MAY_BE_FALSE))
                    || ((type_mask & MAY_BE_FALSE) && (single_type_mask == MAY_BE_TRUE)) ) {
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Type contains both true and false, bool must be used instead");
            }
            ZEND_TYPE_FULL_MASK(type) |= ZEND_TYPE_PURE_MASK(single_type);
            ZEND_TYPE_FULL_MASK(single_type) &= ~_ZEND_TYPE_MAY_BE_MASK;
 
            if (ZEND_TYPE_IS_COMPLEX(single_type)) {
                if (!ZEND_TYPE_IS_COMPLEX(type) && !is_composite) {
                    /* The first class type can be stored directly as the type ptr payload. */
                    ZEND_TYPE_SET_PTR(type, ZEND_TYPE_NAME(single_type));
                    ZEND_TYPE_FULL_MASK(type) |= _ZEND_TYPE_NAME_BIT;
                } else {
                    if (type_list->num_types == 0) {
                        /* Switch from single name to name list. */
                        type_list->num_types = 1;
                        type_list->types[0] = type;
                        ZEND_TYPE_FULL_MASK(type_list->types[0]) &= ~_ZEND_TYPE_MAY_BE_MASK;
                        ZEND_TYPE_SET_LIST(type, type_list);
                    }
 
                    type_list->types[type_list->num_types++] = single_type;
 
                    /* Check for trivially redundant class types */
                    zend_is_type_list_redundant_by_single_type(type_list, single_type);
                }
            }
        }
 
        if (type_list->num_types) {
            zend_type_list *list = zend_arena_alloc(
                &CG(arena), ZEND_TYPE_LIST_SIZE(type_list->num_types));
            memcpy(list, type_list, ZEND_TYPE_LIST_SIZE(type_list->num_types));
            ZEND_TYPE_SET_LIST(type, list);
            ZEND_TYPE_FULL_MASK(type) |= _ZEND_TYPE_ARENA_BIT;
            /* Inform that the type list is a union type */
            ZEND_TYPE_FULL_MASK(type) |= _ZEND_TYPE_UNION_BIT;
        }
 
        free_alloca(type_list, use_heap);
 
        uint32_t type_mask = ZEND_TYPE_FULL_MASK(type);
        if ((type_mask & MAY_BE_OBJECT) &&
                ((!has_only_iterable_class && ZEND_TYPE_IS_COMPLEX(type)) || (type_mask & MAY_BE_STATIC))) {
            zend_string *type_str = zend_type_to_string(type);
            zend_error_noreturn(E_COMPILE_ERROR,
                "Type %s contains both object and a class type, which is redundant",
                ZSTR_VAL(type_str));
        }
    } else if (ast->kind == ZEND_AST_TYPE_INTERSECTION) {
        zend_ast_list *list = zend_ast_get_list(ast);
        zend_type_list *type_list;
 
        /* Allocate the type list directly on the arena as it must be a type
         * list of the same number of elements as the AST list has children */
        type_list = zend_arena_alloc(&CG(arena), ZEND_TYPE_LIST_SIZE(list->children));
        type_list->num_types = 0;
 
        ZEND_ASSERT(list->children > 1);
 
        for (uint32_t i = 0; i < list->children; i++) {
            zend_ast *type_ast = list->child[i];
            zend_type single_type = zend_compile_single_typename(type_ast);
 
            /* An intersection of union types cannot exist so invalidate it
             * Currently only can happen with iterable getting canonicalized to Traversable|array */
            if (ZEND_TYPE_IS_ITERABLE_FALLBACK(single_type)) {
                zend_string *standard_type_str = zend_type_to_string(single_type);
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Type %s cannot be part of an intersection type", ZSTR_VAL(standard_type_str));
                zend_string_release_ex(standard_type_str, false);
            }
            /* An intersection of standard types cannot exist so invalidate it */
            if (ZEND_TYPE_IS_ONLY_MASK(single_type)) {
                zend_string *standard_type_str = zend_type_to_string(single_type);
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Type %s cannot be part of an intersection type", ZSTR_VAL(standard_type_str));
                zend_string_release_ex(standard_type_str, false);
            }
            /* Check for "self" and "parent" too */
            if (zend_string_equals_literal_ci(ZEND_TYPE_NAME(single_type), "self")
                    || zend_string_equals_literal_ci(ZEND_TYPE_NAME(single_type), "parent")) {
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Type %s cannot be part of an intersection type", ZSTR_VAL(ZEND_TYPE_NAME(single_type)));
            }
 
            /* Add type to the type list */
            type_list->types[type_list->num_types++] = single_type;
 
            /* Check for trivially redundant class types */
            zend_is_type_list_redundant_by_single_type(type_list, single_type);
        }
 
        ZEND_ASSERT(list->children == type_list->num_types);
 
        /* An implicitly nullable intersection type needs to be converted to a DNF type */
        if (force_allow_null) {
            zend_type intersection_type = ZEND_TYPE_INIT_NONE(0);
            ZEND_TYPE_SET_LIST(intersection_type, type_list);
            ZEND_TYPE_FULL_MASK(intersection_type) |= _ZEND_TYPE_INTERSECTION_BIT;
            ZEND_TYPE_FULL_MASK(intersection_type) |= _ZEND_TYPE_ARENA_BIT;
 
            zend_type_list *dnf_type_list = zend_arena_alloc(&CG(arena), ZEND_TYPE_LIST_SIZE(1));
            dnf_type_list->num_types = 1;
            dnf_type_list->types[0] = intersection_type;
            ZEND_TYPE_SET_LIST(type, dnf_type_list);
            /* Inform that the type list is a DNF type */
            ZEND_TYPE_FULL_MASK(type) |= _ZEND_TYPE_UNION_BIT;
            ZEND_TYPE_FULL_MASK(type) |= _ZEND_TYPE_ARENA_BIT;
        } else {
            ZEND_TYPE_SET_LIST(type, type_list);
            /* Inform that the type list is an intersection type */
            ZEND_TYPE_FULL_MASK(type) |= _ZEND_TYPE_INTERSECTION_BIT;
            ZEND_TYPE_FULL_MASK(type) |= _ZEND_TYPE_ARENA_BIT;
        }
    } else {
        type = zend_compile_single_typename(ast);
    }
 
    uint32_t type_mask = ZEND_TYPE_PURE_MASK(type);
 
    if (type_mask == MAY_BE_ANY && is_marked_nullable) {
        zend_error_noreturn(E_COMPILE_ERROR, "Type mixed cannot be marked as nullable since mixed already includes null");
    }
 
    if ((type_mask & MAY_BE_NULL) && is_marked_nullable) {
        zend_error_noreturn(E_COMPILE_ERROR, "null cannot be marked as nullable");
    }
 
    if (force_allow_null && !is_marked_nullable && !(type_mask & MAY_BE_NULL)) {
        *forced_allow_null = true;
    }
 
    if (is_marked_nullable || force_allow_null) {
        ZEND_TYPE_FULL_MASK(type) |= MAY_BE_NULL;
        type_mask = ZEND_TYPE_PURE_MASK(type);
    }
 
    if ((type_mask & MAY_BE_VOID) && (ZEND_TYPE_IS_COMPLEX(type) || type_mask != MAY_BE_VOID)) {
        zend_error_noreturn(E_COMPILE_ERROR, "Void can only be used as a standalone type");
    }
 
    if ((type_mask & MAY_BE_NEVER) && (ZEND_TYPE_IS_COMPLEX(type) || type_mask != MAY_BE_NEVER)) {
        zend_error_noreturn(E_COMPILE_ERROR, "never can only be used as a standalone type");
    }
 
    ast->attr = orig_ast_attr;
    return type;
}
/* }}} */
 
static zend_type zend_compile_typename(zend_ast *ast)
{
    bool forced_allow_null;
    return zend_compile_typename_ex(ast, false, &forced_allow_null);
}
 
/* May convert value from int to float. */
static bool zend_is_valid_default_value(zend_type type, zval *value)
{
    ZEND_ASSERT(ZEND_TYPE_IS_SET(type));
    if (ZEND_TYPE_CONTAINS_CODE(type, Z_TYPE_P(value))) {
        return 1;
    }
    if ((ZEND_TYPE_FULL_MASK(type) & MAY_BE_DOUBLE) && Z_TYPE_P(value) == IS_LONG) {
        /* Integers are allowed as initializers for floating-point values. */
        convert_to_double(value);
        return 1;
    }
    return 0;
}
 
static void zend_compile_attributes(
    HashTable **attributes, zend_ast *ast, uint32_t offset, uint32_t target, uint32_t promoted
) /* {{{ */ {
    zend_attribute *attr;
    zend_internal_attribute *config;
 
    zend_ast_list *list = zend_ast_get_list(ast);
    uint32_t g, i, j;
 
    ZEND_ASSERT(ast->kind == ZEND_AST_ATTRIBUTE_LIST);
 
    for (g = 0; g < list->children; g++) {
        zend_ast_list *group = zend_ast_get_list(list->child[g]);
 
        ZEND_ASSERT(group->kind == ZEND_AST_ATTRIBUTE_GROUP);
 
        for (i = 0; i < group->children; i++) {
            ZEND_ASSERT(group->child[i]->kind == ZEND_AST_ATTRIBUTE);
 
            zend_ast *el = group->child[i];
 
            if (el->child[1] &&
                el->child[1]->kind == ZEND_AST_CALLABLE_CONVERT) {
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Cannot create Closure as attribute argument");
            }
 
            zend_string *name = zend_resolve_class_name_ast(el->child[0]);
            zend_string *lcname = zend_string_tolower_ex(name, false);
            zend_ast_list *args = el->child[1] ? zend_ast_get_list(el->child[1]) : NULL;
 
            config = zend_internal_attribute_get(lcname);
            zend_string_release(lcname);
 
            /* Exclude internal attributes that do not match on promoted properties. */
            if (config && !(target & (config->flags & ZEND_ATTRIBUTE_TARGET_ALL))) {
                if (promoted & (config->flags & ZEND_ATTRIBUTE_TARGET_ALL)) {
                    zend_string_release(name);
                    continue;
                }
            }
 
            uint32_t flags = (CG(active_op_array)->fn_flags & ZEND_ACC_STRICT_TYPES)
                ? ZEND_ATTRIBUTE_STRICT_TYPES : 0;
            attr = zend_add_attribute(
                attributes, name, args ? args->children : 0, flags, offset, el->lineno);
            zend_string_release(name);
 
            /* Populate arguments */
            if (args) {
                ZEND_ASSERT(args->kind == ZEND_AST_ARG_LIST);
 
                bool uses_named_args = 0;
                for (j = 0; j < args->children; j++) {
                    zend_ast **arg_ast_ptr = &args->child[j];
                    zend_ast *arg_ast = *arg_ast_ptr;
 
                    if (arg_ast->kind == ZEND_AST_UNPACK) {
                        zend_error_noreturn(E_COMPILE_ERROR,
                            "Cannot use unpacking in attribute argument list");
                    }
 
                    if (arg_ast->kind == ZEND_AST_NAMED_ARG) {
                        attr->args[j].name = zend_string_copy(zend_ast_get_str(arg_ast->child[0]));
                        arg_ast_ptr = &arg_ast->child[1];
                        uses_named_args = 1;
 
                        for (uint32_t k = 0; k < j; k++) {
                            if (attr->args[k].name &&
                                    zend_string_equals(attr->args[k].name, attr->args[j].name)) {
                                zend_error_noreturn(E_COMPILE_ERROR, "Duplicate named parameter $%s",
                                    ZSTR_VAL(attr->args[j].name));
                            }
                        }
                    } else if (uses_named_args) {
                        zend_error_noreturn(E_COMPILE_ERROR,
                            "Cannot use positional argument after named argument");
                    }
 
                    zend_const_expr_to_zval(
                        &attr->args[j].value, arg_ast_ptr, /* allow_dynamic */ true);
                }
            }
        }
    }
 
    if (*attributes != NULL) {
        /* Validate attributes in a secondary loop (needed to detect repeated attributes). */
        ZEND_HASH_PACKED_FOREACH_PTR(*attributes, attr) {
            if (attr->offset != offset || NULL == (config = zend_internal_attribute_get(attr->lcname))) {
                continue;
            }
 
            if (!(target & (config->flags & ZEND_ATTRIBUTE_TARGET_ALL))) {
                zend_string *location = zend_get_attribute_target_names(target);
                zend_string *allowed = zend_get_attribute_target_names(config->flags);
 
                zend_error_noreturn(E_ERROR, "Attribute \"%s\" cannot target %s (allowed targets: %s)",
                    ZSTR_VAL(attr->name), ZSTR_VAL(location), ZSTR_VAL(allowed)
                );
            }
 
            if (!(config->flags & ZEND_ATTRIBUTE_IS_REPEATABLE)) {
                if (zend_is_attribute_repeated(*attributes, attr)) {
                    zend_error_noreturn(E_ERROR, "Attribute \"%s\" must not be repeated", ZSTR_VAL(attr->name));
                }
            }
 
            if (config->validator != NULL) {
                config->validator(attr, target, CG(active_class_entry));
            }
        } ZEND_HASH_FOREACH_END();
    }
}
/* }}} */
 
static void zend_compile_property_hooks(
        zend_property_info *prop_info, zend_string *prop_name,
        zend_ast *prop_type_ast, zend_ast_list *hooks);
 
typedef struct {
    zend_string *property_name;
    bool uses_property;
} find_property_usage_context;
 
static void zend_property_hook_find_property_usage(zend_ast **ast_ptr, void *_context) /* {{{ */
{
    zend_ast *ast = *ast_ptr;
    find_property_usage_context *context = (find_property_usage_context *) _context;
 
    if (ast == NULL) {
        return;
    } else if (ast->kind == ZEND_AST_PROP || ast->kind == ZEND_AST_NULLSAFE_PROP) {
        zend_ast *object_ast = ast->child[0];
        zend_ast *property_ast = ast->child[1];
 
        if (object_ast->kind == ZEND_AST_VAR
         && object_ast->child[0]->kind == ZEND_AST_ZVAL
         && property_ast->kind == ZEND_AST_ZVAL) {
            zval *object = zend_ast_get_zval(object_ast->child[0]);
            zval *property = zend_ast_get_zval(property_ast);
            if (Z_TYPE_P(object) == IS_STRING
                && Z_TYPE_P(property) == IS_STRING
                && zend_string_equals_literal(Z_STR_P(object), "this")
                && zend_string_equals(Z_STR_P(property), context->property_name)) {
                context->uses_property = true;
                /* No need to look for references in this branch. */
                return;
            }
        }
    }
 
    /* Don't search across function/class boundaries. */
    if (!zend_ast_is_special(ast)) {
        zend_ast_apply(ast, zend_property_hook_find_property_usage, context);
    }
}
 
static bool zend_property_hook_uses_property(zend_string *property_name, zend_string *hook_name, zend_ast *hook_ast)
{
    if (zend_string_equals_literal_ci(hook_name, "set")
     && hook_ast->kind == ZEND_AST_PROPERTY_HOOK_SHORT_BODY) {
        return true;
    }
 
    find_property_usage_context context = { property_name, false };
    zend_property_hook_find_property_usage(&hook_ast, &context);
    return context.uses_property;
}
 
static bool zend_property_is_virtual(zend_class_entry *ce, zend_string *property_name, zend_ast *hooks_ast, uint32_t flags)
{
    if (ce->ce_flags & ZEND_ACC_INTERFACE) {
        return true;
    }
    if (!hooks_ast) {
        return false;
    }
 
    bool is_virtual = true;
 
    zend_ast_list *hooks = zend_ast_get_list(hooks_ast);
    for (uint32_t i = 0; i < hooks->children; i++) {
        zend_ast_decl *hook = (zend_ast_decl *) hooks->child[i];
        zend_ast *body = hook->child[2];
        if (body && zend_property_hook_uses_property(property_name, hook->name, body)) {
            is_virtual = false;
        }
    }
 
    return is_virtual;
}
 
static void zend_compile_params(zend_ast *ast, zend_ast *return_type_ast, uint32_t fallback_return_type) /* {{{ */
{
    zend_ast_list *list = zend_ast_get_list(ast);
    uint32_t i;
    zend_op_array *op_array = CG(active_op_array);
    zend_arg_info *arg_infos;
 
    if (return_type_ast || fallback_return_type) {
        /* Use op_array->arg_info[-1] for return type */
        arg_infos = safe_emalloc(sizeof(zend_arg_info), list->children + 1, 0);
        arg_infos->name = NULL;
        if (return_type_ast) {
            arg_infos->type = zend_compile_typename(return_type_ast);
            ZEND_TYPE_FULL_MASK(arg_infos->type) |= _ZEND_ARG_INFO_FLAGS(
                (op_array->fn_flags & ZEND_ACC_RETURN_REFERENCE) != 0, /* is_variadic */ 0, /* is_tentative */ 0);
        } else {
            arg_infos->type = (zend_type) ZEND_TYPE_INIT_CODE(fallback_return_type, 0, 0);
        }
        arg_infos++;
        op_array->fn_flags |= ZEND_ACC_HAS_RETURN_TYPE;
 
        if (ZEND_TYPE_CONTAINS_CODE(arg_infos[-1].type, IS_VOID)
                && (op_array->fn_flags & ZEND_ACC_RETURN_REFERENCE)) {
            zend_string *func_name = get_function_or_method_name((zend_function *) op_array);
            zend_error(E_DEPRECATED, "%s(): Returning by reference from a void function is deprecated", ZSTR_VAL(func_name));
            zend_string_release(func_name);
        }
    } else {
        if (list->children == 0) {
            return;
        }
        arg_infos = safe_emalloc(sizeof(zend_arg_info), list->children, 0);
    }
 
    /* Find last required parameter number for deprecation message. */
    uint32_t last_required_param = (uint32_t) -1;
    for (i = 0; i < list->children; ++i) {
        zend_ast *param_ast = list->child[i];
        zend_ast *default_ast_ptr = param_ast->child[2];
        bool is_variadic = (param_ast->attr & ZEND_PARAM_VARIADIC) != 0;
        if (!default_ast_ptr && !is_variadic) {
            last_required_param = i;
        }
    }
 
    for (i = 0; i < list->children; ++i) {
        zend_ast *param_ast = list->child[i];
        zend_ast *type_ast = param_ast->child[0];
        zend_ast *var_ast = param_ast->child[1];
        zend_ast **default_ast_ptr = &param_ast->child[2];
        zend_ast *attributes_ast = param_ast->child[3];
        zend_ast *doc_comment_ast = param_ast->child[4];
        zend_ast *hooks_ast = param_ast->child[5];
        zend_string *name = zval_make_interned_string(zend_ast_get_zval(var_ast));
        bool is_ref = (param_ast->attr & ZEND_PARAM_REF) != 0;
        bool is_variadic = (param_ast->attr & ZEND_PARAM_VARIADIC) != 0;
        uint32_t property_flags = param_ast->attr & (ZEND_ACC_PPP_MASK | ZEND_ACC_PPP_SET_MASK | ZEND_ACC_READONLY);
        bool is_promoted = property_flags || hooks_ast;
 
        znode var_node, default_node;
        uint8_t opcode;
        zend_op *opline;
        zend_arg_info *arg_info;
 
        if (zend_is_auto_global(name)) {
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot re-assign auto-global variable %s",
                ZSTR_VAL(name));
        }
 
        var_node.op_type = IS_CV;
        var_node.u.op.var = lookup_cv(name);
 
        if (EX_VAR_TO_NUM(var_node.u.op.var) != i) {
            zend_error_noreturn(E_COMPILE_ERROR, "Redefinition of parameter $%s",
                ZSTR_VAL(name));
        } else if (zend_string_equals(name, ZSTR_KNOWN(ZEND_STR_THIS))) {
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot use $this as parameter");
        }
 
        if (op_array->fn_flags & ZEND_ACC_VARIADIC) {
            zend_error_noreturn(E_COMPILE_ERROR, "Only the last parameter can be variadic");
        }
 
        if (is_variadic) {
            opcode = ZEND_RECV_VARIADIC;
            default_node.op_type = IS_UNUSED;
            op_array->fn_flags |= ZEND_ACC_VARIADIC;
 
            if (*default_ast_ptr) {
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Variadic parameter cannot have a default value");
            }
        } else if (*default_ast_ptr) {
            /* we cannot substitute constants here or it will break ReflectionParameter::getDefaultValueConstantName() and ReflectionParameter::isDefaultValueConstant() */
            uint32_t cops = CG(compiler_options);
            CG(compiler_options) |= ZEND_COMPILE_NO_CONSTANT_SUBSTITUTION | ZEND_COMPILE_NO_PERSISTENT_CONSTANT_SUBSTITUTION;
            opcode = ZEND_RECV_INIT;
            default_node.op_type = IS_CONST;
            zend_const_expr_to_zval(
                &default_node.u.constant, default_ast_ptr, /* allow_dynamic */ true);
            CG(compiler_options) = cops;
        } else {
            opcode = ZEND_RECV;
            default_node.op_type = IS_UNUSED;
            op_array->required_num_args = i + 1;
        }
 
        arg_info = &arg_infos[i];
        arg_info->name = zend_string_copy(name);
        arg_info->type = (zend_type) ZEND_TYPE_INIT_NONE(0);
 
        if (attributes_ast) {
            zend_compile_attributes(
                &op_array->attributes, attributes_ast, i + 1, ZEND_ATTRIBUTE_TARGET_PARAMETER,
                is_promoted ? ZEND_ATTRIBUTE_TARGET_PROPERTY : 0
            );
        }
 
        bool forced_allow_nullable = false;
        if (type_ast) {
            uint32_t default_type = *default_ast_ptr ? Z_TYPE(default_node.u.constant) : IS_UNDEF;
            bool force_nullable = default_type == IS_NULL && !is_promoted;
 
            op_array->fn_flags |= ZEND_ACC_HAS_TYPE_HINTS;
            arg_info->type = zend_compile_typename_ex(type_ast, force_nullable, &forced_allow_nullable);
            if (forced_allow_nullable) {
                zend_string *func_name = get_function_or_method_name((zend_function *) op_array);
                zend_error(E_DEPRECATED,
                   "%s(): Implicitly marking parameter $%s as nullable is deprecated, the explicit nullable type "
                   "must be used instead", ZSTR_VAL(func_name), ZSTR_VAL(name));
                zend_string_release(func_name);
            }
 
            if (ZEND_TYPE_FULL_MASK(arg_info->type) & MAY_BE_VOID) {
                zend_error_noreturn(E_COMPILE_ERROR, "void cannot be used as a parameter type");
            }
 
            if (ZEND_TYPE_FULL_MASK(arg_info->type) & MAY_BE_NEVER) {
                zend_error_noreturn(E_COMPILE_ERROR, "never cannot be used as a parameter type");
            }
 
            if (default_type != IS_UNDEF && default_type != IS_CONSTANT_AST && !force_nullable
                    && !zend_is_valid_default_value(arg_info->type, &default_node.u.constant)) {
                zend_string *type_str = zend_type_to_string(arg_info->type);
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Cannot use %s as default value for parameter $%s of type %s",
                    zend_get_type_by_const(default_type),
                    ZSTR_VAL(name), ZSTR_VAL(type_str));
            }
        }
        if (last_required_param != (uint32_t) -1
         && i < last_required_param
         && default_node.op_type == IS_CONST) {
            /* Ignore parameters of the form "Type $param = null".
             * This is the PHP 5 style way of writing "?Type $param", so allow it for now. */
            if (!forced_allow_nullable) {
                zend_string *func_name = get_function_or_method_name((zend_function *) op_array);
                zend_ast *required_param_ast = list->child[last_required_param];
                zend_error(E_DEPRECATED,
                    "%s(): Optional parameter $%s declared before required parameter $%s "
                    "is implicitly treated as a required parameter",
                    ZSTR_VAL(func_name), ZSTR_VAL(name), ZSTR_VAL(zend_ast_get_str(required_param_ast->child[1])));
                zend_string_release(func_name);
            }
 
            /* Regardless of whether we issue a deprecation, convert this parameter into
             * a required parameter without a default value. This ensures that it cannot be
             * used as an optional parameter even with named parameters. */
            opcode = ZEND_RECV;
            default_node.op_type = IS_UNUSED;
            zval_ptr_dtor(&default_node.u.constant);
        }
 
        opline = zend_emit_op(NULL, opcode, NULL, &default_node);
        SET_NODE(opline->result, &var_node);
        opline->op1.num = i + 1;
 
        if (type_ast) {
            /* Allocate cache slot to speed-up run-time class resolution */
            opline->extended_value =
                zend_alloc_cache_slots(zend_type_get_num_classes(arg_info->type));
        }
 
        uint32_t arg_info_flags = _ZEND_ARG_INFO_FLAGS(is_ref, is_variadic, /* is_tentative */ 0)
            | (is_promoted ? _ZEND_IS_PROMOTED_BIT : 0);
        ZEND_TYPE_FULL_MASK(arg_info->type) |= arg_info_flags;
        if (opcode == ZEND_RECV) {
            opline->op2.num = type_ast ?
                ZEND_TYPE_FULL_MASK(arg_info->type) : MAY_BE_ANY;
        }
 
        if (is_promoted) {
            zend_op_array *op_array = CG(active_op_array);
            zend_class_entry *scope = op_array->scope;
 
            bool is_ctor =
                scope && zend_is_constructor(op_array->function_name);
            if (!is_ctor) {
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Cannot declare promoted property outside a constructor");
            }
            if ((op_array->fn_flags & ZEND_ACC_ABSTRACT)
                    || (scope->ce_flags & ZEND_ACC_INTERFACE)) {
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Cannot declare promoted property in an abstract constructor");
            }
            if (is_variadic) {
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Cannot declare variadic promoted property");
            }
            if (zend_hash_exists(&scope->properties_info, name)) {
                zend_error_noreturn(E_COMPILE_ERROR, "Cannot redeclare %s::$%s",
                    ZSTR_VAL(scope->name), ZSTR_VAL(name));
            }
            if (ZEND_TYPE_FULL_MASK(arg_info->type) & MAY_BE_CALLABLE) {
                zend_string *str = zend_type_to_string(arg_info->type);
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Property %s::$%s cannot have type %s",
                    ZSTR_VAL(scope->name), ZSTR_VAL(name), ZSTR_VAL(str));
            }
 
            if (!(property_flags & ZEND_ACC_READONLY) && (scope->ce_flags & ZEND_ACC_READONLY_CLASS)) {
                property_flags |= ZEND_ACC_READONLY;
            }
 
            /* Recompile the type, as it has different memory management requirements. */
            zend_type type = ZEND_TYPE_INIT_NONE(0);
            if (type_ast) {
                type = zend_compile_typename(type_ast);
            }
 
            /* Don't give the property an explicit default value. For typed properties this means
             * uninitialized, for untyped properties it means an implicit null default value.
             * Properties with hooks get an implicit default value of undefined until inheritance,
             * where it is changed to null only once we know it is not virtual. If we were to set it
             * here, we couldn't verify that a true virtual property must not have an explicit
             * default value. */
            zval default_value;
            if (ZEND_TYPE_IS_SET(type) || hooks_ast) {
                ZVAL_UNDEF(&default_value);
            } else {
                if (property_flags & ZEND_ACC_READONLY) {
                    zend_error_noreturn(E_COMPILE_ERROR, "Readonly property %s::$%s must have type",
                        ZSTR_VAL(scope->name), ZSTR_VAL(name));
                }
 
                ZVAL_NULL(&default_value);
            }
 
            zend_string *doc_comment =
                doc_comment_ast ? zend_string_copy(zend_ast_get_str(doc_comment_ast)) : NULL;
            zend_property_info *prop = zend_declare_typed_property(
                scope, name, &default_value,
                property_flags | (zend_property_is_virtual(scope, name, hooks_ast, property_flags) ? ZEND_ACC_VIRTUAL : 0) | ZEND_ACC_PROMOTED,
                doc_comment, type);
            if (hooks_ast) {
                zend_ast_list *hooks = zend_ast_get_list(hooks_ast);
                zend_compile_property_hooks(prop, name, type_ast, hooks);
            }
            if (attributes_ast) {
                zend_compile_attributes(
                    &prop->attributes, attributes_ast, 0, ZEND_ATTRIBUTE_TARGET_PROPERTY, ZEND_ATTRIBUTE_TARGET_PARAMETER);
            }
        }
    }
 
    /* These are assigned at the end to avoid uninitialized memory in case of an error */
    op_array->num_args = list->children;
    op_array->arg_info = arg_infos;
 
    /* Don't count the variadic argument */
    if (op_array->fn_flags & ZEND_ACC_VARIADIC) {
        op_array->num_args--;
    }
    zend_set_function_arg_flags((zend_function*)op_array);
 
    for (i = 0; i < list->children; i++) {
        zend_ast *param_ast = list->child[i];
        zend_ast *hooks_ast = param_ast->child[5];
        bool is_ref = (param_ast->attr & ZEND_PARAM_REF) != 0;
        uint32_t flags = param_ast->attr & (ZEND_ACC_PPP_MASK | ZEND_ACC_PPP_SET_MASK | ZEND_ACC_READONLY);
        bool is_promoted = flags || hooks_ast;
        if (!is_promoted) {
            continue;
        }
 
        /* Emit $this->prop = $prop for promoted properties. */
        zend_string *name = zend_ast_get_str(param_ast->child[1]);
        znode name_node, value_node;
        name_node.op_type = IS_CONST;
        ZVAL_STR_COPY(&name_node.u.constant, name);
        value_node.op_type = IS_CV;
        value_node.u.op.var = lookup_cv(name);
 
        zend_op *opline = zend_emit_op(NULL,
            is_ref ? ZEND_ASSIGN_OBJ_REF : ZEND_ASSIGN_OBJ, NULL, &name_node);
        opline->extended_value = zend_alloc_cache_slots(3);
        zend_emit_op_data(&value_node);
    }
}
/* }}} */
 
static void zend_compile_closure_binding(znode *closure, zend_op_array *op_array, zend_ast *uses_ast) /* {{{ */
{
    zend_ast_list *list = zend_ast_get_list(uses_ast);
    uint32_t i;
 
    if (!list->children) {
        return;
    }
 
    if (!op_array->static_variables) {
        op_array->static_variables = zend_new_array(8);
    }
 
    for (i = 0; i < list->children; ++i) {
        zend_ast *var_name_ast = list->child[i];
        zend_string *var_name = zval_make_interned_string(zend_ast_get_zval(var_name_ast));
        uint32_t mode = var_name_ast->attr;
        zend_op *opline;
        zval *value;
 
        if (zend_string_equals(var_name, ZSTR_KNOWN(ZEND_STR_THIS))) {
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot use $this as lexical variable");
        }
 
        if (zend_is_auto_global(var_name)) {
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot use auto-global as lexical variable");
        }
 
        value = zend_hash_add(op_array->static_variables, var_name, &EG(uninitialized_zval));
        if (!value) {
            zend_error_noreturn_unchecked(E_COMPILE_ERROR,
                "Cannot use variable $%S twice", var_name);
        }
 
        CG(zend_lineno) = zend_ast_get_lineno(var_name_ast);
 
        opline = zend_emit_op(NULL, ZEND_BIND_LEXICAL, closure, NULL);
        opline->op2_type = IS_CV;
        opline->op2.var = lookup_cv(var_name);
        opline->extended_value =
            (uint32_t)((char*)value - (char*)op_array->static_variables->arData) | mode;
    }
}
/* }}} */
 
typedef struct {
    HashTable uses;
    bool varvars_used;
} closure_info;
 
static void find_implicit_binds_recursively(closure_info *info, zend_ast *ast) {
    if (!ast) {
        return;
    }
 
    if (ast->kind == ZEND_AST_VAR) {
        zend_ast *name_ast = ast->child[0];
        if (name_ast->kind == ZEND_AST_ZVAL && Z_TYPE_P(zend_ast_get_zval(name_ast)) == IS_STRING) {
            zend_string *name = zend_ast_get_str(name_ast);
            if (zend_is_auto_global(name)) {
                /* These is no need to explicitly import auto-globals. */
                return;
            }
 
            if (zend_string_equals(name, ZSTR_KNOWN(ZEND_STR_THIS))) {
                /* $this does not need to be explicitly imported. */
                return;
            }
 
            zend_hash_add_empty_element(&info->uses, name);
        } else {
            info->varvars_used = 1;
            find_implicit_binds_recursively(info, name_ast);
        }
    } else if (zend_ast_is_list(ast)) {
        zend_ast_list *list = zend_ast_get_list(ast);
        uint32_t i;
        for (i = 0; i < list->children; i++) {
            find_implicit_binds_recursively(info, list->child[i]);
        }
    } else if (ast->kind == ZEND_AST_CLOSURE) {
        /* For normal closures add the use() list. */
        zend_ast_decl *closure_ast = (zend_ast_decl *) ast;
        zend_ast *uses_ast = closure_ast->child[1];
        if (uses_ast) {
            zend_ast_list *uses_list = zend_ast_get_list(uses_ast);
            uint32_t i;
            for (i = 0; i < uses_list->children; i++) {
                zend_hash_add_empty_element(&info->uses, zend_ast_get_str(uses_list->child[i]));
            }
        }
    } else if (ast->kind == ZEND_AST_ARROW_FUNC) {
        /* For arrow functions recursively check the expression. */
        zend_ast_decl *closure_ast = (zend_ast_decl *) ast;
        find_implicit_binds_recursively(info, closure_ast->child[2]);
    } else if (!zend_ast_is_special(ast)) {
        uint32_t i, children = zend_ast_get_num_children(ast);
        for (i = 0; i < children; i++) {
            find_implicit_binds_recursively(info, ast->child[i]);
        }
    }
}
 
static void find_implicit_binds(closure_info *info, zend_ast *params_ast, zend_ast *stmt_ast)
{
    zend_ast_list *param_list = zend_ast_get_list(params_ast);
    uint32_t i;
 
    zend_hash_init(&info->uses, param_list->children, NULL, NULL, 0);
 
    find_implicit_binds_recursively(info, stmt_ast);
 
    /* Remove variables that are parameters */
    for (i = 0; i < param_list->children; i++) {
        zend_ast *param_ast = param_list->child[i];
        zend_hash_del(&info->uses, zend_ast_get_str(param_ast->child[1]));
    }
}
 
static void compile_implicit_lexical_binds(
        closure_info *info, znode *closure, zend_op_array *op_array)
{
    zend_string *var_name;
    zend_op *opline;
 
    /* TODO We might want to use a special binding mode if varvars_used is set. */
    if (zend_hash_num_elements(&info->uses) == 0) {
        return;
    }
 
    if (!op_array->static_variables) {
        op_array->static_variables = zend_new_array(8);
    }
 
    ZEND_HASH_MAP_FOREACH_STR_KEY(&info->uses, var_name)
        zval *value = zend_hash_add(
            op_array->static_variables, var_name, &EG(uninitialized_zval));
        uint32_t offset = (uint32_t)((char*)value - (char*)op_array->static_variables->arData);
 
        opline = zend_emit_op(NULL, ZEND_BIND_LEXICAL, closure, NULL);
        opline->op2_type = IS_CV;
        opline->op2.var = lookup_cv(var_name);
        opline->extended_value = offset | ZEND_BIND_IMPLICIT;
    ZEND_HASH_FOREACH_END();
}
 
static void zend_compile_closure_uses(zend_ast *ast) /* {{{ */
{
    zend_op_array *op_array = CG(active_op_array);
    zend_ast_list *list = zend_ast_get_list(ast);
    uint32_t i;
 
    for (i = 0; i < list->children; ++i) {
        uint32_t mode = ZEND_BIND_EXPLICIT;
        zend_ast *var_ast = list->child[i];
        zend_string *var_name = zend_ast_get_str(var_ast);
        zval zv;
        ZVAL_NULL(&zv);
 
        {
            int i;
            for (i = 0; i < op_array->last_var; i++) {
                if (zend_string_equals(op_array->vars[i], var_name)) {
                    zend_error_noreturn_unchecked(E_COMPILE_ERROR,
                        "Cannot use lexical variable $%S as a parameter name", var_name);
                }
            }
        }
 
        CG(zend_lineno) = zend_ast_get_lineno(var_ast);
 
        if (var_ast->attr) {
            mode |= ZEND_BIND_REF;
        }
 
        zend_compile_static_var_common(var_name, &zv, mode);
    }
}
/* }}} */
 
static void zend_compile_implicit_closure_uses(closure_info *info)
{
    zend_string *var_name;
    ZEND_HASH_MAP_FOREACH_STR_KEY(&info->uses, var_name)
        zval zv;
        ZVAL_NULL(&zv);
        zend_compile_static_var_common(var_name, &zv, ZEND_BIND_IMPLICIT);
    ZEND_HASH_FOREACH_END();
}
 
static void add_stringable_interface(zend_class_entry *ce) {
    for (uint32_t i = 0; i < ce->num_interfaces; i++) {
        if (zend_string_equals_literal(ce->interface_names[i].lc_name, "stringable")) {
            /* Interface already explicitly implemented */
            return;
        }
    }
 
    ce->num_interfaces++;
    ce->interface_names =
        erealloc(ce->interface_names, sizeof(zend_class_name) * ce->num_interfaces);
    // TODO: Add known interned strings instead?
    ce->interface_names[ce->num_interfaces - 1].name =
        ZSTR_INIT_LITERAL("Stringable", 0);
    ce->interface_names[ce->num_interfaces - 1].lc_name =
        ZSTR_INIT_LITERAL("stringable", 0);
}
 
static zend_string *zend_begin_method_decl(zend_op_array *op_array, zend_string *name, bool has_body) /* {{{ */
{
    zend_class_entry *ce = CG(active_class_entry);
    bool in_interface = (ce->ce_flags & ZEND_ACC_INTERFACE) != 0;
    uint32_t fn_flags = op_array->fn_flags;
 
    zend_string *lcname;
 
    if (fn_flags & ZEND_ACC_READONLY) {
        zend_error(E_COMPILE_ERROR, "Cannot use 'readonly' as method modifier");
    }
 
    if ((fn_flags & ZEND_ACC_PRIVATE) && (fn_flags & ZEND_ACC_FINAL) && !zend_is_constructor(name)) {
        zend_error(E_COMPILE_WARNING, "Private methods cannot be final as they are never overridden by other classes");
    }
 
    if (in_interface) {
        if (!(fn_flags & ZEND_ACC_PUBLIC)) {
            zend_error_noreturn(E_COMPILE_ERROR, "Access type for interface method "
                "%s::%s() must be public", ZSTR_VAL(ce->name), ZSTR_VAL(name));
        }
        if (fn_flags & ZEND_ACC_FINAL) {
            zend_error_noreturn(E_COMPILE_ERROR, "Interface method "
                "%s::%s() must not be final", ZSTR_VAL(ce->name), ZSTR_VAL(name));
        }
        if (fn_flags & ZEND_ACC_ABSTRACT) {
            zend_error_noreturn(E_COMPILE_ERROR, "Interface method "
                "%s::%s() must not be abstract", ZSTR_VAL(ce->name), ZSTR_VAL(name));
        }
        op_array->fn_flags |= ZEND_ACC_ABSTRACT;
    }
 
    if (op_array->fn_flags & ZEND_ACC_ABSTRACT) {
        if ((op_array->fn_flags & ZEND_ACC_PRIVATE) && !(ce->ce_flags & ZEND_ACC_TRAIT)) {
            zend_error_noreturn(E_COMPILE_ERROR, "%s function %s::%s() cannot be declared private",
                in_interface ? "Interface" : "Abstract", ZSTR_VAL(ce->name), ZSTR_VAL(name));
        }
 
        if (has_body) {
            zend_error_noreturn(E_COMPILE_ERROR, "%s function %s::%s() cannot contain body",
                in_interface ? "Interface" : "Abstract", ZSTR_VAL(ce->name), ZSTR_VAL(name));
        }
 
        ce->ce_flags |= ZEND_ACC_IMPLICIT_ABSTRACT_CLASS;
    } else if (!has_body) {
        zend_error_noreturn(E_COMPILE_ERROR, "Non-abstract method %s::%s() must contain body",
            ZSTR_VAL(ce->name), ZSTR_VAL(name));
    }
 
    op_array->scope = ce;
    op_array->function_name = zend_string_copy(name);
 
    lcname = zend_string_tolower(name);
    lcname = zend_new_interned_string(lcname);
 
    if (zend_hash_add_ptr(&ce->function_table, lcname, op_array) == NULL) {
        zend_error_noreturn(E_COMPILE_ERROR, "Cannot redeclare %s::%s()",
            ZSTR_VAL(ce->name), ZSTR_VAL(name));
    }
 
    zend_add_magic_method(ce, (zend_function *) op_array, lcname);
    if (zend_string_equals_literal(lcname, ZEND_TOSTRING_FUNC_NAME)
            && !(ce->ce_flags & ZEND_ACC_TRAIT)) {
        add_stringable_interface(ce);
    }
 
    return lcname;
}
/* }}} */
 
static uint32_t zend_add_dynamic_func_def(zend_op_array *def) {
    zend_op_array *op_array = CG(active_op_array);
    uint32_t def_offset = op_array->num_dynamic_func_defs++;
    op_array->dynamic_func_defs = erealloc(
        op_array->dynamic_func_defs, op_array->num_dynamic_func_defs * sizeof(zend_op_array *));
    op_array->dynamic_func_defs[def_offset] = def;
    return def_offset;
}
 
static zend_string *zend_begin_func_decl(znode *result, zend_op_array *op_array, zend_ast_decl *decl, bool toplevel) /* {{{ */
{
    zend_string *unqualified_name, *name, *lcname;
    zend_op *opline;
 
    if (op_array->fn_flags & ZEND_ACC_CLOSURE) {
        zend_string *filename = op_array->filename;
        uint32_t start_lineno = decl->start_lineno;
 
        zend_string *class = zend_empty_string;
        zend_string *separator = zend_empty_string;
        zend_string *function = filename;
        char *parens = "";
 
        if (CG(active_op_array) && CG(active_op_array)->function_name) {
            if (CG(active_op_array)->fn_flags & ZEND_ACC_CLOSURE) {
                /* If the parent function is a closure, don't redundantly
                 * add the classname and parentheses.
                 */
                function = CG(active_op_array)->function_name;
            } else {
                function = CG(active_op_array)->function_name;
                parens = "()";
 
                if (CG(active_class_entry) && CG(active_class_entry)->name) {
                    class = CG(active_class_entry)->name;
                    separator = ZSTR_KNOWN(ZEND_STR_PAAMAYIM_NEKUDOTAYIM);
                }
            }
        }
 
        unqualified_name = zend_strpprintf_unchecked(
            0,
            "{closure:%S%S%S%s:%" PRIu32 "}",
            class,
            separator,
            function,
            parens,
            start_lineno
        );
 
        op_array->function_name = name = unqualified_name;
    } else {
        unqualified_name = decl->name;
        op_array->function_name = name = zend_prefix_with_ns(unqualified_name);
    }
 
    lcname = zend_string_tolower(name);
 
    if (FC(imports_function)) {
        zend_string *import_name =
            zend_hash_find_ptr_lc(FC(imports_function), unqualified_name);
        if (import_name && !zend_string_equals_ci(lcname, import_name)) {
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot redeclare function %s() (previously declared as local import)",
                ZSTR_VAL(name));
        }
    }
 
    if (zend_string_equals_literal(lcname, "__autoload")) {
        zend_error_noreturn(E_COMPILE_ERROR,
            "__autoload() is no longer supported, use spl_autoload_register() instead");
    }
 
    if (zend_string_equals_literal_ci(unqualified_name, "assert")) {
        zend_error(E_COMPILE_ERROR,
            "Defining a custom assert() function is not allowed, "
            "as the function has special semantics");
    }
 
    zend_register_seen_symbol(lcname, ZEND_SYMBOL_FUNCTION);
    if (!toplevel) {
        uint32_t func_ref = zend_add_dynamic_func_def(op_array);
        if (op_array->fn_flags & ZEND_ACC_CLOSURE) {
            opline = zend_emit_op_tmp(result, ZEND_DECLARE_LAMBDA_FUNCTION, NULL, NULL);
            opline->op2.num = func_ref;
        } else {
            opline = get_next_op();
            opline->opcode = ZEND_DECLARE_FUNCTION;
            opline->op1_type = IS_CONST;
            LITERAL_STR(opline->op1, zend_string_copy(lcname));
            opline->op2.num = func_ref;
        }
    }
    return lcname;
}
/* }}} */
 
static zend_op_array *zend_compile_func_decl_ex(
    znode *result, zend_ast *ast, bool toplevel,
    const zend_property_info *property_info,
    zend_property_hook_kind hook_kind
) {
    zend_ast_decl *decl = (zend_ast_decl *) ast;
    zend_ast *params_ast = decl->child[0];
    zend_ast *uses_ast = decl->child[1];
    zend_ast *stmt_ast = decl->child[2];
    zend_ast *return_type_ast = decl->child[3];
    bool is_method = decl->kind == ZEND_AST_METHOD;
    zend_string *lcname = NULL;
    bool is_hook = decl->kind == ZEND_AST_PROPERTY_HOOK;
 
    zend_class_entry *orig_class_entry = CG(active_class_entry);
    zend_op_array *orig_op_array = CG(active_op_array);
    zend_op_array *op_array = zend_arena_alloc(&CG(arena), sizeof(zend_op_array));
    zend_oparray_context orig_oparray_context;
    closure_info info;
    memset(&info, 0, sizeof(closure_info));
 
    init_op_array(op_array, ZEND_USER_FUNCTION, INITIAL_OP_ARRAY_SIZE);
 
    if (CG(compiler_options) & ZEND_COMPILE_PRELOAD) {
        op_array->fn_flags |= ZEND_ACC_PRELOADED;
    }
 
    op_array->fn_flags |= (orig_op_array->fn_flags & ZEND_ACC_STRICT_TYPES);
    op_array->fn_flags |= decl->flags;
    op_array->line_start = decl->start_lineno;
    op_array->line_end = decl->end_lineno;
    if (decl->doc_comment) {
        op_array->doc_comment = zend_string_copy(decl->doc_comment);
    }
 
    if (decl->kind == ZEND_AST_CLOSURE || decl->kind == ZEND_AST_ARROW_FUNC) {
        op_array->fn_flags |= ZEND_ACC_CLOSURE;
    }
 
    if (is_hook) {
        zend_class_entry *ce = CG(active_class_entry);
        op_array->scope = ce;
        op_array->function_name = zend_string_copy(decl->name);
    } else if (is_method) {
        bool has_body = stmt_ast != NULL;
        lcname = zend_begin_method_decl(op_array, decl->name, has_body);
    } else {
        lcname = zend_begin_func_decl(result, op_array, decl, toplevel);
        if (decl->kind == ZEND_AST_ARROW_FUNC) {
            find_implicit_binds(&info, params_ast, stmt_ast);
            compile_implicit_lexical_binds(&info, result, op_array);
        } else if (uses_ast) {
            zend_compile_closure_binding(result, op_array, uses_ast);
        }
    }
 
    CG(active_op_array) = op_array;
 
    if (decl->child[4]) {
        int target = ZEND_ATTRIBUTE_TARGET_FUNCTION;
 
        if (is_method || is_hook) {
            target = ZEND_ATTRIBUTE_TARGET_METHOD;
        }
 
        zend_compile_attributes(&op_array->attributes, decl->child[4], 0, target, 0);
 
        zend_attribute *override_attribute = zend_get_attribute_str(
            op_array->attributes,
            "override",
            sizeof("override")-1
        );
 
        if (override_attribute) {
            op_array->fn_flags |= ZEND_ACC_OVERRIDE;
        }
 
        zend_attribute *deprecated_attribute = zend_get_attribute_str(
            op_array->attributes,
            "deprecated",
            sizeof("deprecated")-1
        );
 
        if (deprecated_attribute) {
            op_array->fn_flags |= ZEND_ACC_DEPRECATED;
        }
    }
 
    /* Do not leak the class scope into free standing functions, even if they are dynamically
     * defined inside a class method. This is necessary for correct handling of magic constants.
     * For example __CLASS__ should always be "" inside a free standing function. */
    if (decl->kind == ZEND_AST_FUNC_DECL) {
        CG(active_class_entry) = NULL;
    }
 
    if (toplevel) {
        op_array->fn_flags |= ZEND_ACC_TOP_LEVEL;
    }
 
    zend_oparray_context_begin(&orig_oparray_context, op_array);
    CG(context).active_property_info = property_info;
    CG(context).active_property_hook_kind = hook_kind;
 
    {
        /* Push a separator to the loop variable stack */
        zend_loop_var dummy_var;
        dummy_var.opcode = ZEND_RETURN;
 
        zend_stack_push(&CG(loop_var_stack), (void *) &dummy_var);
    }
 
    zend_compile_params(params_ast, return_type_ast,
        is_method && zend_string_equals_literal(lcname, ZEND_TOSTRING_FUNC_NAME) ? IS_STRING : 0);
    if (CG(active_op_array)->fn_flags & ZEND_ACC_GENERATOR) {
        zend_mark_function_as_generator();
        zend_emit_op(NULL, ZEND_GENERATOR_CREATE, NULL, NULL);
    }
    if (decl->kind == ZEND_AST_ARROW_FUNC) {
        zend_compile_implicit_closure_uses(&info);
        zend_hash_destroy(&info.uses);
    } else if (uses_ast) {
        zend_compile_closure_uses(uses_ast);
    }
 
    if (ast->kind == ZEND_AST_ARROW_FUNC && decl->child[2]->kind != ZEND_AST_RETURN) {
        bool needs_return = true;
        if (op_array->fn_flags & ZEND_ACC_HAS_RETURN_TYPE) {
            zend_arg_info *return_info = CG(active_op_array)->arg_info - 1;
            needs_return = !ZEND_TYPE_CONTAINS_CODE(return_info->type, IS_NEVER);
        }
        if (needs_return) {
            stmt_ast = zend_ast_create(ZEND_AST_RETURN, stmt_ast);
            decl->child[2] = stmt_ast;
        }
    }
 
    zend_compile_stmt(stmt_ast);
 
    if (is_method) {
        CG(zend_lineno) = decl->start_lineno;
        zend_check_magic_method_implementation(
            CG(active_class_entry), (zend_function *) op_array, lcname, E_COMPILE_ERROR);
    } else if (toplevel) {
        /* Only register the function after a successful compile */
        if (UNEXPECTED(zend_hash_add_ptr(CG(function_table), lcname, op_array) == NULL)) {
            CG(zend_lineno) = decl->start_lineno;
            do_bind_function_error(lcname, op_array, true);
        }
    }
 
    /* put the implicit return on the really last line */
    CG(zend_lineno) = decl->end_lineno;
 
    zend_do_extended_stmt();
    zend_emit_final_return(0);
 
    pass_two(CG(active_op_array));
    zend_oparray_context_end(&orig_oparray_context);
 
    /* Pop the loop variable stack separator */
    zend_stack_del_top(&CG(loop_var_stack));
 
    if (toplevel) {
        zend_observer_function_declared_notify(op_array, lcname);
    }
 
    if (lcname != NULL) {
        zend_string_release_ex(lcname, 0);
    }
 
    CG(active_op_array) = orig_op_array;
    CG(active_class_entry) = orig_class_entry;
 
    return op_array;
}
 
static zend_op_array *zend_compile_func_decl(znode *result, zend_ast *ast, bool toplevel)
{
    return zend_compile_func_decl_ex(result, ast, toplevel, /* property_info */ NULL, (zend_property_hook_kind)-1);
}
 
zend_property_hook_kind zend_get_property_hook_kind_from_name(zend_string *name) {
    if (zend_string_equals_literal_ci(name, "get")) {
        return ZEND_PROPERTY_HOOK_GET;
    } else if (zend_string_equals_literal_ci(name, "set")) {
        return ZEND_PROPERTY_HOOK_SET;
    } else {
        return (zend_property_hook_kind)-1;
    }
}
 
static void zend_compile_property_hooks(
        zend_property_info *prop_info, zend_string *prop_name,
        zend_ast *prop_type_ast, zend_ast_list *hooks)
{
    zend_class_entry *ce = CG(active_class_entry);
 
    if (prop_info->flags & ZEND_ACC_READONLY) {
        zend_error_noreturn(E_COMPILE_ERROR, "Hooked properties cannot be readonly");
    }
 
    if (hooks->children == 0) {
        zend_error_noreturn(E_COMPILE_ERROR, "Property hook list must not be empty");
    }
 
    for (uint32_t i = 0; i < hooks->children; i++) {
        zend_ast_decl *hook = (zend_ast_decl *) hooks->child[i];
        zend_string *name = hook->name;
        zend_ast *stmt_ast = hook->child[2];
        zend_ast **return_type_ast_ptr = NULL;
        zend_ast **value_type_ast_ptr = NULL;
        CG(zend_lineno) = hook->start_lineno;
 
        /* Non-private hooks are always public. This avoids having to copy the hook when inheriting
         * hooks from protected properties to public ones. */
        uint32_t hook_visibility = (prop_info->flags & ZEND_ACC_PPP_MASK) != ZEND_ACC_PRIVATE ? ZEND_ACC_PUBLIC : ZEND_ACC_PRIVATE;
        hook->flags |= hook_visibility;
 
        if (prop_info->flags & ZEND_ACC_STATIC) {
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot declare hooks for static property");
        }
        if ((hook->flags & ZEND_ACC_FINAL) && (hook->flags & ZEND_ACC_PRIVATE)) {
            zend_error_noreturn(E_COMPILE_ERROR, "Property hook cannot be both final and private");
        }
        if ((ce->ce_flags & ZEND_ACC_INTERFACE)
         || ((prop_info->flags & ZEND_ACC_ABSTRACT) && !stmt_ast)) {
            hook->flags |= ZEND_ACC_ABSTRACT;
 
            if (stmt_ast) {
                zend_error_noreturn(E_COMPILE_ERROR, "Abstract property hook cannot have body");
            }
            if (hook->flags & ZEND_ACC_PRIVATE) {
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Property hook cannot be both abstract and private");
            }
            if (hook->flags & ZEND_ACC_FINAL) {
                zend_error_noreturn(E_COMPILE_ERROR, "Property hook cannot be both abstract and final");
            }
        } else if (!stmt_ast) {
            zend_error_noreturn(E_COMPILE_ERROR, "Non-abstract property hook must have a body");
        }
 
        zend_property_hook_kind hook_kind = zend_get_property_hook_kind_from_name(name);
        if (hook_kind == (zend_property_hook_kind)-1) {
            zend_error_noreturn(E_COMPILE_ERROR,
                "Unknown hook \"%s\" for property %s::$%s, expected \"get\" or \"set\"",
                ZSTR_VAL(name), ZSTR_VAL(ce->name), ZSTR_VAL(prop_name));
        }
 
        if (stmt_ast && stmt_ast->kind == ZEND_AST_PROPERTY_HOOK_SHORT_BODY) {
            stmt_ast = stmt_ast->child[0];
            if (hook_kind == ZEND_PROPERTY_HOOK_GET) {
                stmt_ast = zend_ast_create(ZEND_AST_RETURN, stmt_ast);
            } else {
                ZEND_ASSERT(hook_kind == ZEND_PROPERTY_HOOK_SET);
                stmt_ast = zend_ast_create(ZEND_AST_ASSIGN,
                    zend_ast_create(ZEND_AST_PROP,
                        zend_ast_create(ZEND_AST_VAR, zend_ast_create_zval_from_str(ZSTR_KNOWN(ZEND_STR_THIS))),
                        zend_ast_create_zval_from_str(zend_copy_unmangled_prop_name(prop_info->name))),
                    stmt_ast);
            }
            stmt_ast = zend_ast_create_list(1, ZEND_AST_STMT_LIST, stmt_ast);
            hook->child[2] = stmt_ast;
        }
 
        if (hook_kind == ZEND_PROPERTY_HOOK_GET) {
            if (hook->child[0]) {
                zend_error_noreturn(E_COMPILE_ERROR, "get hook of property %s::$%s must not have a parameter list",
                    ZSTR_VAL(ce->name), ZSTR_VAL(prop_name));
            }
 
            hook->child[0] = zend_ast_create_list(0, ZEND_AST_PARAM_LIST);
 
            return_type_ast_ptr = &hook->child[3];
            *return_type_ast_ptr = prop_type_ast;
        } else if (hook_kind == ZEND_PROPERTY_HOOK_SET) {
            if (hook->child[0]) {
                zend_ast_list *param_list = zend_ast_get_list(hook->child[0]);
                if (param_list->children != 1) {
                    zend_error_noreturn(E_COMPILE_ERROR, "%s hook of property %s::$%s must accept exactly one parameters",
                        ZSTR_VAL(name), ZSTR_VAL(ce->name), ZSTR_VAL(prop_name));
                }
                zend_ast *value_param_ast = param_list->child[0];
                if (value_param_ast->attr & ZEND_PARAM_REF) {
                    zend_error_noreturn(E_COMPILE_ERROR, "Parameter $%s of %s hook %s::$%s must not be pass-by-reference",
                        ZSTR_VAL(zend_ast_get_str(value_param_ast->child[1])), ZSTR_VAL(name), ZSTR_VAL(ce->name), ZSTR_VAL(prop_name));
                }
                if (value_param_ast->attr & ZEND_PARAM_VARIADIC) {
                    zend_error_noreturn(E_COMPILE_ERROR, "Parameter $%s of %s hook %s::$%s must not be variadic",
                        ZSTR_VAL(zend_ast_get_str(value_param_ast->child[1])), ZSTR_VAL(name), ZSTR_VAL(ce->name), ZSTR_VAL(prop_name));
                }
                if (value_param_ast->child[2]) {
                    zend_error_noreturn(E_COMPILE_ERROR, "Parameter $%s of %s hook %s::$%s must not have a default value",
                        ZSTR_VAL(zend_ast_get_str(value_param_ast->child[1])), ZSTR_VAL(name), ZSTR_VAL(ce->name), ZSTR_VAL(prop_name));
                }
                if ((prop_type_ast != NULL) != (value_param_ast->child[0] != NULL)) {
                    zend_hooked_property_variance_error_ex(zend_ast_get_str(value_param_ast->child[1]), ce->name, prop_info->name);
                }
            } else {
                zend_ast *param_name_ast = zend_ast_create_zval_from_str(ZSTR_KNOWN(ZEND_STR_VALUE));
                zend_ast *param = zend_ast_create(
                    ZEND_AST_PARAM, prop_type_ast, param_name_ast,
                    /* expr */ NULL, /* doc_comment */ NULL, /* attributes */ NULL,
                    /* hooks */ NULL);
                value_type_ast_ptr = &param->child[0];
                hook->child[0] = zend_ast_create_list(1, ZEND_AST_PARAM_LIST, param);
            }
            zend_ast *return_type = zend_ast_create_zval_from_str(ZSTR_KNOWN(ZEND_STR_VOID));
            return_type->attr = ZEND_NAME_NOT_FQ;
            hook->child[3] = return_type;
        } else {
            ZEND_UNREACHABLE();
        }
 
        hook->name = zend_strpprintf(0, "$%s::%s", ZSTR_VAL(prop_name), ZSTR_VAL(name));
 
        zend_function *func = (zend_function *) zend_compile_func_decl_ex(
            NULL, (zend_ast *) hook, /* toplevel */ false, prop_info, hook_kind);
 
        func->common.prop_info = prop_info;
 
        if (!prop_info->hooks) {
            prop_info->hooks = zend_arena_alloc(&CG(arena), ZEND_PROPERTY_HOOK_STRUCT_SIZE);
            memset(prop_info->hooks, 0, ZEND_PROPERTY_HOOK_STRUCT_SIZE);
        }
 
        if (prop_info->hooks[hook_kind]) {
            zend_error_noreturn(E_COMPILE_ERROR,
                "Cannot redeclare property hook \"%s\"", ZSTR_VAL(name));
        }
        prop_info->hooks[hook_kind] = func;
 
        if (hook_kind == ZEND_PROPERTY_HOOK_SET) {
            switch (zend_verify_property_hook_variance(prop_info, func)) {
                case INHERITANCE_SUCCESS:
                    break;
                case INHERITANCE_UNRESOLVED:
                    ce->num_hooked_prop_variance_checks++;
                    break;
                case INHERITANCE_ERROR:
                    zend_hooked_property_variance_error(prop_info);
                case INHERITANCE_WARNING:
                    ZEND_UNREACHABLE();
            }
        }
 
        zend_string_release(name);
        /* Un-share type ASTs to avoid double-frees of zval nodes. */
        if (return_type_ast_ptr) {
            *return_type_ast_ptr = NULL;
        }
        if (value_type_ast_ptr) {
            *value_type_ast_ptr = NULL;
        }
    }
 
    ce->num_hooked_props++;
 
    /* See zend_link_hooked_object_iter(). */
#ifndef ZEND_OPCACHE_SHM_REATTACHMENT
    if (!ce->get_iterator) {
        /* Will be removed again, in case of Iterator or IteratorAggregate. */
        ce->get_iterator = zend_hooked_object_get_iterator;
    }
#endif
 
    if (!prop_info->ce->parent_name) {
        zend_verify_hooked_property(ce, prop_info, prop_name);
    }
}
 
static void zend_compile_prop_decl(zend_ast *ast, zend_ast *type_ast, uint32_t flags, zend_ast *attr_ast) /* {{{ */
{
    zend_ast_list *list = zend_ast_get_list(ast);
    zend_class_entry *ce = CG(active_class_entry);
    uint32_t i, children = list->children;
 
    if (ce->ce_flags & ZEND_ACC_ENUM) {
        zend_error_noreturn(E_COMPILE_ERROR, "Enum %s cannot include properties", ZSTR_VAL(ce->name));
    }
 
    if ((flags & ZEND_ACC_FINAL) && (flags & ZEND_ACC_PRIVATE)) {
        zend_error_noreturn(E_COMPILE_ERROR, "Property cannot be both final and private");
    }
 
    if ((flags & ZEND_ACC_STATIC) && (flags & ZEND_ACC_PPP_SET_MASK)) {
        zend_error_noreturn(E_COMPILE_ERROR, "Static property may not have asymmetric visibility");
    }
 
    if (ce->ce_flags & ZEND_ACC_INTERFACE) {
        if (flags & ZEND_ACC_FINAL) {
            zend_error_noreturn(E_COMPILE_ERROR, "Property in interface cannot be final");
        }
        if (flags & (ZEND_ACC_PROTECTED|ZEND_ACC_PRIVATE)) {
            zend_error_noreturn(E_COMPILE_ERROR, "Property in interface cannot be protected or private");
        }
        if (flags & ZEND_ACC_ABSTRACT) {
            zend_error_noreturn(E_COMPILE_ERROR,
                "Property in interface cannot be explicitly abstract. "
                "All interface members are implicitly abstract");
        }
        flags |= ZEND_ACC_ABSTRACT;
    }
 
    for (i = 0; i < children; ++i) {
        zend_property_info *info;
        zend_ast *prop_ast = list->child[i];
        zend_ast *name_ast = prop_ast->child[0];
        zend_ast **value_ast_ptr = &prop_ast->child[1];
        zend_ast *doc_comment_ast = prop_ast->child[2];
        zend_ast *hooks_ast = prop_ast->child[3];
        zend_string *name = zval_make_interned_string(zend_ast_get_zval(name_ast));
        zend_string *doc_comment = NULL;
        zval value_zv;
        zend_type type = ZEND_TYPE_INIT_NONE(0);
        flags |= zend_property_is_virtual(ce, name, hooks_ast, flags) ? ZEND_ACC_VIRTUAL : 0;
 
        /* FIXME: This is a dirty fix to maintain ABI compatibility. We don't
         * have an actual property info yet, but we really only need the name
         * anyway. We should convert this to a zend_string. */
        const zend_property_info *old_active_property_info = CG(context).active_property_info;
        zend_property_info dummy_prop_info = { .name = name };
        CG(context).active_property_info = &dummy_prop_info;
 
        if (!hooks_ast) {
            if (ce->ce_flags & ZEND_ACC_INTERFACE) {
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Interfaces may only include hooked properties");
            }
            if (flags & ZEND_ACC_ABSTRACT) {
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Only hooked properties may be declared abstract");
            }
        }
        if ((flags & ZEND_ACC_ABSTRACT)) {
            ce->ce_flags |= ZEND_ACC_IMPLICIT_ABSTRACT_CLASS;
        }
 
        if (type_ast) {
            type = zend_compile_typename(type_ast);
 
            if (ZEND_TYPE_FULL_MASK(type) & (MAY_BE_VOID|MAY_BE_NEVER|MAY_BE_CALLABLE)) {
                zend_string *str = zend_type_to_string(type);
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Property %s::$%s cannot have type %s",
                    ZSTR_VAL(ce->name), ZSTR_VAL(name), ZSTR_VAL(str));
            }
        }
 
        /* Doc comment has been appended as last element in ZEND_AST_PROP_ELEM ast */
        if (doc_comment_ast) {
            doc_comment = zend_string_copy(zend_ast_get_str(doc_comment_ast));
        }
 
        if (zend_hash_exists(&ce->properties_info, name)) {
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot redeclare %s::$%s",
                ZSTR_VAL(ce->name), ZSTR_VAL(name));
        }
 
        if (*value_ast_ptr) {
            zend_const_expr_to_zval(&value_zv, value_ast_ptr, /* allow_dynamic */ false);
 
            if (ZEND_TYPE_IS_SET(type) && !Z_CONSTANT(value_zv)
                    && !zend_is_valid_default_value(type, &value_zv)) {
                zend_string *str = zend_type_to_string(type);
                if (Z_TYPE(value_zv) == IS_NULL && !ZEND_TYPE_IS_INTERSECTION(type)) {
                    ZEND_TYPE_FULL_MASK(type) |= MAY_BE_NULL;
                    zend_string *nullable_str = zend_type_to_string(type);
 
                    zend_error_noreturn(E_COMPILE_ERROR,
                        "Default value for property of type %s may not be null. "
                        "Use the nullable type %s to allow null default value",
                        ZSTR_VAL(str), ZSTR_VAL(nullable_str));
                } else {
                    zend_error_noreturn(E_COMPILE_ERROR,
                        "Cannot use %s as default value for property %s::$%s of type %s",
                        zend_zval_value_name(&value_zv),
                        ZSTR_VAL(ce->name), ZSTR_VAL(name), ZSTR_VAL(str));
                }
            }
        } else if (!ZEND_TYPE_IS_SET(type) && !hooks_ast) {
            ZVAL_NULL(&value_zv);
        } else {
            ZVAL_UNDEF(&value_zv);
        }
 
        if ((ce->ce_flags & ZEND_ACC_READONLY_CLASS)) {
            flags |= ZEND_ACC_READONLY;
        }
 
        if (flags & ZEND_ACC_READONLY) {
            if (!ZEND_TYPE_IS_SET(type)) {
                zend_error_noreturn(E_COMPILE_ERROR, "Readonly property %s::$%s must have type",
                    ZSTR_VAL(ce->name), ZSTR_VAL(name));
            }
            if (!Z_ISUNDEF(value_zv)) {
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Readonly property %s::$%s cannot have default value",
                    ZSTR_VAL(ce->name), ZSTR_VAL(name));
            }
            if (flags & ZEND_ACC_STATIC) {
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Static property %s::$%s cannot be readonly",
                    ZSTR_VAL(ce->name), ZSTR_VAL(name));
            }
        }
 
        info = zend_declare_typed_property(ce, name, &value_zv, flags, doc_comment, type);
 
        if (hooks_ast) {
            zend_compile_property_hooks(info, name, type_ast, zend_ast_get_list(hooks_ast));
        }
 
        if (attr_ast) {
            zend_compile_attributes(&info->attributes, attr_ast, 0, ZEND_ATTRIBUTE_TARGET_PROPERTY, 0);
        }
 
        CG(context).active_property_info = old_active_property_info;
    }
}
/* }}} */
 
static void zend_compile_prop_group(zend_ast *ast) /* {{{ */
{
    zend_ast *type_ast = ast->child[0];
    zend_ast *prop_ast = ast->child[1];
    zend_ast *attr_ast = ast->child[2];
 
    zend_compile_prop_decl(prop_ast, type_ast, ast->attr, attr_ast);
}
/* }}} */
 
static void zend_check_trait_alias_modifiers(uint32_t attr) /* {{{ */
{
    if (attr & ZEND_ACC_STATIC) {
        zend_error_noreturn(E_COMPILE_ERROR, "Cannot use \"static\" as method modifier in trait alias");
    } else if (attr & ZEND_ACC_ABSTRACT) {
        zend_error_noreturn(E_COMPILE_ERROR, "Cannot use \"abstract\" as method modifier in trait alias");
    }
}
/* }}} */
 
static void zend_compile_class_const_decl(zend_ast *ast, uint32_t flags, zend_ast *attr_ast, zend_ast *type_ast)
{
    zend_ast_list *list = zend_ast_get_list(ast);
    zend_class_entry *ce = CG(active_class_entry);
    uint32_t i, children = list->children;
 
    for (i = 0; i < children; ++i) {
        zend_class_constant *c;
        zend_ast *const_ast = list->child[i];
        zend_ast *name_ast = const_ast->child[0];
        zend_ast **value_ast_ptr = &const_ast->child[1];
        zend_ast *doc_comment_ast = const_ast->child[2];
        zend_string *name = zval_make_interned_string(zend_ast_get_zval(name_ast));
        zend_string *doc_comment = doc_comment_ast ? zend_string_copy(zend_ast_get_str(doc_comment_ast)) : NULL;
        zval value_zv;
        zend_type type = ZEND_TYPE_INIT_NONE(0);
 
        if (type_ast) {
            type = zend_compile_typename(type_ast);
 
            uint32_t type_mask = ZEND_TYPE_PURE_MASK(type);
 
            if (type_mask != MAY_BE_ANY && (type_mask & (MAY_BE_CALLABLE|MAY_BE_VOID|MAY_BE_NEVER))) {
                zend_string *type_str = zend_type_to_string(type);
 
                zend_error_noreturn(E_COMPILE_ERROR, "Class constant %s::%s cannot have type %s",
                    ZSTR_VAL(ce->name), ZSTR_VAL(name), ZSTR_VAL(type_str));
            }
        }
 
        if (UNEXPECTED((flags & ZEND_ACC_PRIVATE) && (flags & ZEND_ACC_FINAL))) {
            zend_error_noreturn(
                E_COMPILE_ERROR, "Private constant %s::%s cannot be final as it is not visible to other classes",
                ZSTR_VAL(ce->name), ZSTR_VAL(name)
            );
        }
 
        zend_const_expr_to_zval(&value_zv, value_ast_ptr, /* allow_dynamic */ false);
 
        if (!Z_CONSTANT(value_zv) && ZEND_TYPE_IS_SET(type) && !zend_is_valid_default_value(type, &value_zv)) {
            zend_string *type_str = zend_type_to_string(type);
 
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot use %s as value for class constant %s::%s of type %s",
                zend_zval_type_name(&value_zv), ZSTR_VAL(ce->name), ZSTR_VAL(name), ZSTR_VAL(type_str));
        }
 
        c = zend_declare_typed_class_constant(ce, name, &value_zv, flags, doc_comment, type);
 
        if (attr_ast) {
            zend_compile_attributes(&c->attributes, attr_ast, 0, ZEND_ATTRIBUTE_TARGET_CLASS_CONST, 0);
 
            zend_attribute *deprecated = zend_get_attribute_str(c->attributes, "deprecated", sizeof("deprecated")-1);
 
            if (deprecated) {
                ZEND_CLASS_CONST_FLAGS(c) |= ZEND_ACC_DEPRECATED;
            }
        }
    }
}
 
static void zend_compile_class_const_group(zend_ast *ast) /* {{{ */
{
    zend_ast *const_ast = ast->child[0];
    zend_ast *attr_ast = ast->child[1];
    zend_ast *type_ast = ast->child[2];
 
    zend_compile_class_const_decl(const_ast, ast->attr, attr_ast, type_ast);
}
/* }}} */
 
static void zend_compile_method_ref(zend_ast *ast, zend_trait_method_reference *method_ref) /* {{{ */
{
    zend_ast *class_ast = ast->child[0];
    zend_ast *method_ast = ast->child[1];
 
    method_ref->method_name = zend_string_copy(zend_ast_get_str(method_ast));
 
    if (class_ast) {
        method_ref->class_name = zend_resolve_const_class_name_reference(class_ast, "trait name");
    } else {
        method_ref->class_name = NULL;
    }
}
/* }}} */
 
static void zend_compile_trait_precedence(zend_ast *ast) /* {{{ */
{
    zend_ast *method_ref_ast = ast->child[0];
    zend_ast *insteadof_ast = ast->child[1];
    zend_ast_list *insteadof_list = zend_ast_get_list(insteadof_ast);
    uint32_t i;
 
    zend_trait_precedence *precedence = emalloc(sizeof(zend_trait_precedence) + (insteadof_list->children - 1) * sizeof(zend_string*));
    zend_compile_method_ref(method_ref_ast, &precedence->trait_method);
    precedence->num_excludes = insteadof_list->children;
 
    for (i = 0; i < insteadof_list->children; ++i) {
        zend_ast *name_ast = insteadof_list->child[i];
        precedence->exclude_class_names[i] =
            zend_resolve_const_class_name_reference(name_ast, "trait name");
    }
 
    zend_add_to_list(&CG(active_class_entry)->trait_precedences, precedence);
}
/* }}} */
 
static void zend_compile_trait_alias(zend_ast *ast) /* {{{ */
{
    zend_ast *method_ref_ast = ast->child[0];
    zend_ast *alias_ast = ast->child[1];
    uint32_t modifiers = ast->attr;
 
    zend_trait_alias *alias;
 
    zend_check_trait_alias_modifiers(modifiers);
 
    alias = emalloc(sizeof(zend_trait_alias));
    zend_compile_method_ref(method_ref_ast, &alias->trait_method);
    alias->modifiers = modifiers;
 
    if (alias_ast) {
        alias->alias = zend_string_copy(zend_ast_get_str(alias_ast));
    } else {
        alias->alias = NULL;
    }
 
    zend_add_to_list(&CG(active_class_entry)->trait_aliases, alias);
}
/* }}} */
 
static void zend_compile_use_trait(zend_ast *ast) /* {{{ */
{
    zend_ast_list *traits = zend_ast_get_list(ast->child[0]);
    zend_ast_list *adaptations = ast->child[1] ? zend_ast_get_list(ast->child[1]) : NULL;
    zend_class_entry *ce = CG(active_class_entry);
    uint32_t i;
 
    ce->trait_names = erealloc(ce->trait_names, sizeof(zend_class_name) * (ce->num_traits + traits->children));
 
    for (i = 0; i < traits->children; ++i) {
        zend_ast *trait_ast = traits->child[i];
 
        if (ce->ce_flags & ZEND_ACC_INTERFACE) {
            zend_string *name = zend_ast_get_str(trait_ast);
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot use traits inside of interfaces. "
                "%s is used in %s", ZSTR_VAL(name), ZSTR_VAL(ce->name));
        }
 
        ce->trait_names[ce->num_traits].name =
            zend_resolve_const_class_name_reference(trait_ast, "trait name");
        ce->trait_names[ce->num_traits].lc_name = zend_string_tolower(ce->trait_names[ce->num_traits].name);
        ce->num_traits++;
    }
 
    if (!adaptations) {
        return;
    }
 
    for (i = 0; i < adaptations->children; ++i) {
        zend_ast *adaptation_ast = adaptations->child[i];
        switch (adaptation_ast->kind) {
            case ZEND_AST_TRAIT_PRECEDENCE:
                zend_compile_trait_precedence(adaptation_ast);
                break;
            case ZEND_AST_TRAIT_ALIAS:
                zend_compile_trait_alias(adaptation_ast);
                break;
            EMPTY_SWITCH_DEFAULT_CASE()
        }
    }
}
/* }}} */
 
static void zend_compile_implements(zend_ast *ast) /* {{{ */
{
    zend_ast_list *list = zend_ast_get_list(ast);
    zend_class_entry *ce = CG(active_class_entry);
    zend_class_name *interface_names;
    uint32_t i;
 
    interface_names = emalloc(sizeof(zend_class_name) * list->children);
 
    for (i = 0; i < list->children; ++i) {
        zend_ast *class_ast = list->child[i];
        interface_names[i].name =
            zend_resolve_const_class_name_reference(class_ast, "interface name");
        interface_names[i].lc_name = zend_string_tolower(interface_names[i].name);
    }
 
    ce->num_interfaces = list->children;
    ce->interface_names = interface_names;
}
/* }}} */
 
static zend_string *zend_generate_anon_class_name(zend_ast_decl *decl)
{
    zend_string *filename = CG(active_op_array)->filename;
    uint32_t start_lineno = decl->start_lineno;
 
    /* Use parent or first interface as prefix. */
    zend_string *prefix = ZSTR_KNOWN(ZEND_STR_CLASS);
    if (decl->child[0]) {
        prefix = zend_resolve_const_class_name_reference(decl->child[0], "class name");
    } else if (decl->child[1]) {
        zend_ast_list *list = zend_ast_get_list(decl->child[1]);
        prefix = zend_resolve_const_class_name_reference(list->child[0], "interface name");
    }
 
    zend_string *result = zend_strpprintf(0, "%s@anonymous%c%s:%" PRIu32 "$%" PRIx32,
        ZSTR_VAL(prefix), '\0', ZSTR_VAL(filename), start_lineno, CG(rtd_key_counter)++);
    zend_string_release(prefix);
    return zend_new_interned_string(result);
}
 
static void zend_compile_enum_backing_type(zend_class_entry *ce, zend_ast *enum_backing_type_ast)
{
    ZEND_ASSERT(ce->ce_flags & ZEND_ACC_ENUM);
    zend_type type = zend_compile_typename(enum_backing_type_ast);
    uint32_t type_mask = ZEND_TYPE_PURE_MASK(type);
    if (ZEND_TYPE_IS_COMPLEX(type) || (type_mask != MAY_BE_LONG && type_mask != MAY_BE_STRING)) {
        zend_string *type_string = zend_type_to_string(type);
        zend_error_noreturn(E_COMPILE_ERROR,
            "Enum backing type must be int or string, %s given",
            ZSTR_VAL(type_string));
    }
    if (type_mask == MAY_BE_LONG) {
        ce->enum_backing_type = IS_LONG;
    } else {
        ZEND_ASSERT(type_mask == MAY_BE_STRING);
        ce->enum_backing_type = IS_STRING;
    }
    zend_type_release(type, 0);
}
 
static void zend_compile_class_decl(znode *result, zend_ast *ast, bool toplevel) /* {{{ */
{
    zend_ast_decl *decl = (zend_ast_decl *) ast;
    zend_ast *extends_ast = decl->child[0];
    zend_ast *implements_ast = decl->child[1];
    zend_ast *stmt_ast = decl->child[2];
    zend_ast *enum_backing_type_ast = decl->child[4];
    zend_string *name, *lcname;
    zend_class_entry *ce = zend_arena_alloc(&CG(arena), sizeof(zend_class_entry));
    zend_op *opline;
 
    zend_class_entry *original_ce = CG(active_class_entry);
 
    if (EXPECTED((decl->flags & ZEND_ACC_ANON_CLASS) == 0)) {
        zend_string *unqualified_name = decl->name;
 
        if (CG(active_class_entry)) {
            zend_error_noreturn(E_COMPILE_ERROR, "Class declarations may not be nested");
        }
 
        const char *type = "a class name";
        if (decl->flags & ZEND_ACC_ENUM) {
            type = "an enum name";
        } else if (decl->flags & ZEND_ACC_INTERFACE) {
            type = "an interface name";
        } else if (decl->flags & ZEND_ACC_TRAIT) {
            type = "a trait name";
        }
        zend_assert_valid_class_name(unqualified_name, type);
        name = zend_prefix_with_ns(unqualified_name);
        name = zend_new_interned_string(name);
        lcname = zend_string_tolower(name);
 
        if (FC(imports)) {
            zend_string *import_name =
                zend_hash_find_ptr_lc(FC(imports), unqualified_name);
            if (import_name && !zend_string_equals_ci(lcname, import_name)) {
                zend_error_noreturn(E_COMPILE_ERROR, "Cannot redeclare class %s "
                        "(previously declared as local import)", ZSTR_VAL(name));
            }
        }
 
        zend_register_seen_symbol(lcname, ZEND_SYMBOL_CLASS);
    } else {
        /* Find an anon class name that is not in use yet. */
        name = NULL;
        lcname = NULL;
        do {
            zend_tmp_string_release(name);
            zend_tmp_string_release(lcname);
            name = zend_generate_anon_class_name(decl);
            lcname = zend_string_tolower(name);
        } while (zend_hash_exists(CG(class_table), lcname));
    }
    lcname = zend_new_interned_string(lcname);
 
    ce->type = ZEND_USER_CLASS;
    ce->name = name;
    zend_initialize_class_data(ce, 1);
    if (!(decl->flags & ZEND_ACC_ANON_CLASS)) {
        zend_alloc_ce_cache(ce->name);
    }
 
    if (CG(compiler_options) & ZEND_COMPILE_PRELOAD) {
        ce->ce_flags |= ZEND_ACC_PRELOADED;
        ZEND_MAP_PTR_NEW(ce->static_members_table);
        ZEND_MAP_PTR_NEW(ce->mutable_data);
    }
 
    ce->ce_flags |= decl->flags;
    ce->info.user.filename = zend_string_copy(zend_get_compiled_filename());
    ce->info.user.line_start = decl->start_lineno;
    ce->info.user.line_end = decl->end_lineno;
 
    if (decl->doc_comment) {
        ce->doc_comment = zend_string_copy(decl->doc_comment);
    }
 
    if (UNEXPECTED((decl->flags & ZEND_ACC_ANON_CLASS))) {
        /* Serialization is not supported for anonymous classes */
        ce->ce_flags |= ZEND_ACC_NOT_SERIALIZABLE;
    }
 
    if (extends_ast) {
        ce->parent_name =
            zend_resolve_const_class_name_reference(extends_ast, "class name");
    }
 
    CG(active_class_entry) = ce;
 
    if (decl->child[3]) {
        zend_compile_attributes(&ce->attributes, decl->child[3], 0, ZEND_ATTRIBUTE_TARGET_CLASS, 0);
    }
 
    if (implements_ast) {
        zend_compile_implements(implements_ast);
    }
 
    if (ce->ce_flags & ZEND_ACC_ENUM) {
        if (enum_backing_type_ast != NULL) {
            zend_compile_enum_backing_type(ce, enum_backing_type_ast);
        }
        zend_enum_add_interfaces(ce);
        zend_enum_register_props(ce);
    }
 
    zend_compile_stmt(stmt_ast);
 
    /* Reset lineno for final opcodes and errors */
    CG(zend_lineno) = ast->lineno;
 
    if ((ce->ce_flags & (ZEND_ACC_IMPLICIT_ABSTRACT_CLASS|ZEND_ACC_INTERFACE|ZEND_ACC_TRAIT|ZEND_ACC_EXPLICIT_ABSTRACT_CLASS)) == ZEND_ACC_IMPLICIT_ABSTRACT_CLASS) {
        zend_verify_abstract_class(ce);
    }
 
    CG(active_class_entry) = original_ce;
 
    if (toplevel) {
        ce->ce_flags |= ZEND_ACC_TOP_LEVEL;
    }
 
    /* We currently don't early-bind classes that implement interfaces or use traits */
    if (!ce->num_interfaces && !ce->num_traits && !ce->num_hooked_prop_variance_checks
#ifdef ZEND_OPCACHE_SHM_REATTACHMENT
     /* See zend_link_hooked_object_iter(). */
     && !ce->num_hooked_props
#endif
     && !(CG(compiler_options) & ZEND_COMPILE_WITHOUT_EXECUTION)) {
        if (toplevel) {
            if (extends_ast) {
                zend_class_entry *parent_ce = zend_lookup_class_ex(
                    ce->parent_name, NULL, ZEND_FETCH_CLASS_NO_AUTOLOAD);
 
                if (parent_ce
                 && !zend_compile_ignore_class(parent_ce, ce->info.user.filename)) {
                    if (zend_try_early_bind(ce, parent_ce, lcname, NULL)) {
                        zend_string_release(lcname);
                        return;
                    }
                }
            } else if (EXPECTED(zend_hash_add_ptr(CG(class_table), lcname, ce) != NULL)) {
                zend_string_release(lcname);
                zend_build_properties_info_table(ce);
                zend_inheritance_check_override(ce);
                ce->ce_flags |= ZEND_ACC_LINKED;
                zend_observer_class_linked_notify(ce, lcname);
                return;
            } else {
                goto link_unbound;
            }
        } else if (!extends_ast) {
link_unbound:
            /* Link unbound simple class */
            zend_build_properties_info_table(ce);
            zend_inheritance_check_override(ce);
            ce->ce_flags |= ZEND_ACC_LINKED;
        }
    }
 
    opline = get_next_op();
 
    if (ce->parent_name) {
        /* Lowercased parent name */
        zend_string *lc_parent_name = zend_string_tolower(ce->parent_name);
        opline->op2_type = IS_CONST;
        LITERAL_STR(opline->op2, lc_parent_name);
    }
 
    opline->op1_type = IS_CONST;
    /* It's possible that `lcname` is not an interned string because it was not yet in the interned string table.
     * However, by this point another thread may have caused `lcname` to be added in the interned string table.
     * This will cause `lcname` to get freed once it is found in the interned string table. If we were to use
     * LITERAL_STR() here we would not change the `lcname` pointer to the new value, and it would point to the
     * now-freed string. This will cause issues when we use `lcname` in the code below. We solve this by using
     * zend_add_literal_string() which gives us the new value. */
    opline->op1.constant = zend_add_literal_string(&lcname);
 
    if (decl->flags & ZEND_ACC_ANON_CLASS) {
        opline->opcode = ZEND_DECLARE_ANON_CLASS;
        opline->extended_value = zend_alloc_cache_slot();
        zend_make_var_result(result, opline);
        if (!zend_hash_add_ptr(CG(class_table), lcname, ce)) {
            /* We checked above that the class name is not used. This really shouldn't happen. */
            zend_error_noreturn(E_ERROR,
                "Runtime definition key collision for %s. This is a bug", ZSTR_VAL(name));
        }
    } else {
        /* Generate RTD keys until we find one that isn't in use yet. */
        zend_string *key = NULL;
        do {
            zend_tmp_string_release(key);
            key = zend_build_runtime_definition_key(lcname, decl->start_lineno);
        } while (!zend_hash_add_ptr(CG(class_table), key, ce));
 
        /* RTD key is placed after lcname literal in op1 */
        zend_add_literal_string(&key);
 
        opline->opcode = ZEND_DECLARE_CLASS;
        if (toplevel
             && (CG(compiler_options) & ZEND_COMPILE_DELAYED_BINDING)
                /* We currently don't early-bind classes that implement interfaces or use traits */
             && !ce->num_interfaces && !ce->num_traits && !ce->num_hooked_prop_variance_checks
        ) {
            if (!extends_ast) {
                /* Use empty string for classes without parents to avoid new handler, and special
                 * handling of zend_early_binding. */
                opline->op2_type = IS_CONST;
                LITERAL_STR(opline->op2, ZSTR_EMPTY_ALLOC());
            }
            CG(active_op_array)->fn_flags |= ZEND_ACC_EARLY_BINDING;
            opline->opcode = ZEND_DECLARE_CLASS_DELAYED;
            opline->extended_value = zend_alloc_cache_slot();
            opline->result_type = IS_UNUSED;
            opline->result.opline_num = -1;
        }
    }
}
/* }}} */
 
static void zend_compile_enum_case(zend_ast *ast)
{
    zend_class_entry *enum_class = CG(active_class_entry);
    if (!(enum_class->ce_flags & ZEND_ACC_ENUM)) {
        zend_error_noreturn(E_COMPILE_ERROR, "Case can only be used in enums");
    }
 
    zend_string *enum_case_name = zval_make_interned_string(zend_ast_get_zval(ast->child[0]));
    zend_string *enum_class_name = enum_class->name;
 
    zval class_name_zval;
    ZVAL_STR_COPY(&class_name_zval, enum_class_name);
    zend_ast *class_name_ast = zend_ast_create_zval(&class_name_zval);
 
    zval case_name_zval;
    ZVAL_STR_COPY(&case_name_zval, enum_case_name);
    zend_ast *case_name_ast = zend_ast_create_zval(&case_name_zval);
 
    zend_ast *case_value_ast = ast->child[1];
    // Remove case_value_ast from the original AST to avoid freeing it, as it will be freed by zend_const_expr_to_zval
    ast->child[1] = NULL;
    if (enum_class->enum_backing_type != IS_UNDEF && case_value_ast == NULL) {
        zend_error_noreturn(E_COMPILE_ERROR, "Case %s of backed enum %s must have a value",
            ZSTR_VAL(enum_case_name),
            ZSTR_VAL(enum_class_name));
    } else if (enum_class->enum_backing_type == IS_UNDEF && case_value_ast != NULL) {
        zend_error_noreturn(E_COMPILE_ERROR, "Case %s of non-backed enum %s must not have a value",
            ZSTR_VAL(enum_case_name),
            ZSTR_VAL(enum_class_name));
    }
 
    zend_ast *const_enum_init_ast = zend_ast_create(ZEND_AST_CONST_ENUM_INIT, class_name_ast, case_name_ast, case_value_ast);
 
    zval value_zv;
    zend_const_expr_to_zval(&value_zv, &const_enum_init_ast, /* allow_dynamic */ false);
 
    /* Doc comment has been appended as second last element in ZEND_AST_ENUM ast - attributes are conventionally last */
    zend_ast *doc_comment_ast = ast->child[2];
    zend_string *doc_comment = NULL;
    if (doc_comment_ast) {
        doc_comment = zend_string_copy(zend_ast_get_str(doc_comment_ast));
    }
 
    zend_class_constant *c = zend_declare_class_constant_ex(enum_class, enum_case_name, &value_zv, ZEND_ACC_PUBLIC, doc_comment);
    ZEND_CLASS_CONST_FLAGS(c) |= ZEND_CLASS_CONST_IS_CASE;
    zend_ast_destroy(const_enum_init_ast);
 
    zend_ast *attr_ast = ast->child[3];
    if (attr_ast) {
        zend_compile_attributes(&c->attributes, attr_ast, 0, ZEND_ATTRIBUTE_TARGET_CLASS_CONST, 0);
 
        zend_attribute *deprecated = zend_get_attribute_str(c->attributes, "deprecated", sizeof("deprecated")-1);
 
        if (deprecated) {
            ZEND_CLASS_CONST_FLAGS(c) |= ZEND_ACC_DEPRECATED;
        }
    }
}
 
static HashTable *zend_get_import_ht(uint32_t type) /* {{{ */
{
    switch (type) {
        case ZEND_SYMBOL_CLASS:
            if (!FC(imports)) {
                FC(imports) = emalloc(sizeof(HashTable));
                zend_hash_init(FC(imports), 8, NULL, str_dtor, 0);
            }
            return FC(imports);
        case ZEND_SYMBOL_FUNCTION:
            if (!FC(imports_function)) {
                FC(imports_function) = emalloc(sizeof(HashTable));
                zend_hash_init(FC(imports_function), 8, NULL, str_dtor, 0);
            }
            return FC(imports_function);
        case ZEND_SYMBOL_CONST:
            if (!FC(imports_const)) {
                FC(imports_const) = emalloc(sizeof(HashTable));
                zend_hash_init(FC(imports_const), 8, NULL, str_dtor, 0);
            }
            return FC(imports_const);
        EMPTY_SWITCH_DEFAULT_CASE()
    }
 
    return NULL;
}
/* }}} */
 
static char *zend_get_use_type_str(uint32_t type) /* {{{ */
{
    switch (type) {
        case ZEND_SYMBOL_CLASS:
            return "";
        case ZEND_SYMBOL_FUNCTION:
            return " function";
        case ZEND_SYMBOL_CONST:
            return " const";
        EMPTY_SWITCH_DEFAULT_CASE()
    }
 
    return " unknown";
}
/* }}} */
 
static void zend_check_already_in_use(uint32_t type, zend_string *old_name, zend_string *new_name, zend_string *check_name) /* {{{ */
{
    if (zend_string_equals_ci(old_name, check_name)) {
        return;
    }
 
    zend_error_noreturn(E_COMPILE_ERROR, "Cannot use%s %s as %s because the name "
        "is already in use", zend_get_use_type_str(type), ZSTR_VAL(old_name), ZSTR_VAL(new_name));
}
/* }}} */
 
static void zend_compile_use(zend_ast *ast) /* {{{ */
{
    zend_ast_list *list = zend_ast_get_list(ast);
    uint32_t i;
    zend_string *current_ns = FC(current_namespace);
    uint32_t type = ast->attr;
    HashTable *current_import = zend_get_import_ht(type);
    bool case_sensitive = type == ZEND_SYMBOL_CONST;
 
    for (i = 0; i < list->children; ++i) {
        zend_ast *use_ast = list->child[i];
        zend_ast *old_name_ast = use_ast->child[0];
        zend_ast *new_name_ast = use_ast->child[1];
        zend_string *old_name = zend_ast_get_str(old_name_ast);
        zend_string *new_name, *lookup_name;
 
        if (new_name_ast) {
            new_name = zend_string_copy(zend_ast_get_str(new_name_ast));
        } else {
            const char *unqualified_name;
            size_t unqualified_name_len;
            if (zend_get_unqualified_name(old_name, &unqualified_name, &unqualified_name_len)) {
                /* The form "use A\B" is equivalent to "use A\B as B" */
                new_name = zend_string_init(unqualified_name, unqualified_name_len, 0);
            } else {
                new_name = zend_string_copy(old_name);
 
                if (!current_ns) {
                    zend_error(E_WARNING, "The use statement with non-compound name '%s' "
                        "has no effect", ZSTR_VAL(new_name));
                }
            }
        }
 
        if (case_sensitive) {
            lookup_name = zend_string_copy(new_name);
        } else {
            lookup_name = zend_string_tolower(new_name);
        }
 
        if (type == ZEND_SYMBOL_CLASS && zend_is_reserved_class_name(new_name)) {
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot use %s as %s because '%s' "
                "is a special class name", ZSTR_VAL(old_name), ZSTR_VAL(new_name), ZSTR_VAL(new_name));
        }
 
        if (current_ns) {
            zend_string *ns_name = zend_string_alloc(ZSTR_LEN(current_ns) + 1 + ZSTR_LEN(new_name), 0);
            zend_str_tolower_copy(ZSTR_VAL(ns_name), ZSTR_VAL(current_ns), ZSTR_LEN(current_ns));
            ZSTR_VAL(ns_name)[ZSTR_LEN(current_ns)] = '\\';
            memcpy(ZSTR_VAL(ns_name) + ZSTR_LEN(current_ns) + 1, ZSTR_VAL(lookup_name), ZSTR_LEN(lookup_name) + 1);
 
            if (zend_have_seen_symbol(ns_name, type)) {
                zend_check_already_in_use(type, old_name, new_name, ns_name);
            }
 
            zend_string_efree(ns_name);
        } else if (zend_have_seen_symbol(lookup_name, type)) {
            zend_check_already_in_use(type, old_name, new_name, lookup_name);
        }
 
        zend_string_addref(old_name);
        old_name = zend_new_interned_string(old_name);
        if (!zend_hash_add_ptr(current_import, lookup_name, old_name)) {
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot use%s %s as %s because the name "
                "is already in use", zend_get_use_type_str(type), ZSTR_VAL(old_name), ZSTR_VAL(new_name));
        }
 
        zend_string_release_ex(lookup_name, 0);
        zend_string_release_ex(new_name, 0);
    }
}
/* }}} */
 
static void zend_compile_group_use(zend_ast *ast) /* {{{ */
{
    uint32_t i;
    zend_string *ns = zend_ast_get_str(ast->child[0]);
    zend_ast_list *list = zend_ast_get_list(ast->child[1]);
 
    for (i = 0; i < list->children; i++) {
        zend_ast *inline_use, *use = list->child[i];
        zval *name_zval = zend_ast_get_zval(use->child[0]);
        zend_string *name = Z_STR_P(name_zval);
        zend_string *compound_ns = zend_concat_names(ZSTR_VAL(ns), ZSTR_LEN(ns), ZSTR_VAL(name), ZSTR_LEN(name));
        zend_string_release_ex(name, 0);
        ZVAL_STR(name_zval, compound_ns);
        inline_use = zend_ast_create_list(1, ZEND_AST_USE, use);
        inline_use->attr = ast->attr ? ast->attr : use->attr;
        zend_compile_use(inline_use);
    }
}
/* }}} */
 
static void zend_compile_const_decl(zend_ast *ast) /* {{{ */
{
    zend_ast_list *list = zend_ast_get_list(ast);
    uint32_t i;
    for (i = 0; i < list->children; ++i) {
        zend_ast *const_ast = list->child[i];
        zend_ast *name_ast = const_ast->child[0];
        zend_ast **value_ast_ptr = &const_ast->child[1];
        zend_string *unqualified_name = zend_ast_get_str(name_ast);
 
        zend_string *name;
        znode name_node, value_node;
        zval *value_zv = &value_node.u.constant;
 
        value_node.op_type = IS_CONST;
        zend_const_expr_to_zval(value_zv, value_ast_ptr, /* allow_dynamic */ true);
 
        if (zend_get_special_const(ZSTR_VAL(unqualified_name), ZSTR_LEN(unqualified_name))) {
            zend_error_noreturn(E_COMPILE_ERROR,
                "Cannot redeclare constant '%s'", ZSTR_VAL(unqualified_name));
        }
 
        name = zend_prefix_with_ns(unqualified_name);
        name = zend_new_interned_string(name);
 
        if (FC(imports_const)) {
            zend_string *import_name = zend_hash_find_ptr(FC(imports_const), unqualified_name);
            if (import_name && !zend_string_equals(import_name, name)) {
                zend_error_noreturn(E_COMPILE_ERROR, "Cannot declare const %s because "
                    "the name is already in use", ZSTR_VAL(name));
            }
        }
 
        name_node.op_type = IS_CONST;
        ZVAL_STR(&name_node.u.constant, name);
 
        zend_emit_op(NULL, ZEND_DECLARE_CONST, &name_node, &value_node);
 
        zend_register_seen_symbol(name, ZEND_SYMBOL_CONST);
    }
}
/* }}}*/
 
static void zend_compile_namespace(zend_ast *ast) /* {{{ */
{
    zend_ast *name_ast = ast->child[0];
    zend_ast *stmt_ast = ast->child[1];
    zend_string *name;
    bool with_bracket = stmt_ast != NULL;
 
    /* handle mixed syntax declaration or nested namespaces */
    if (!FC(has_bracketed_namespaces)) {
        if (FC(current_namespace)) {
            /* previous namespace declarations were unbracketed */
            if (with_bracket) {
                zend_error_noreturn(E_COMPILE_ERROR, "Cannot mix bracketed namespace declarations "
                    "with unbracketed namespace declarations");
            }
        }
    } else {
        /* previous namespace declarations were bracketed */
        if (!with_bracket) {
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot mix bracketed namespace declarations "
                "with unbracketed namespace declarations");
        } else if (FC(current_namespace) || FC(in_namespace)) {
            zend_error_noreturn(E_COMPILE_ERROR, "Namespace declarations cannot be nested");
        }
    }
 
    bool is_first_namespace = (!with_bracket && !FC(current_namespace))
        || (with_bracket && !FC(has_bracketed_namespaces));
    if (is_first_namespace && FAILURE == zend_is_first_statement(ast, /* allow_nop */ 1)) {
        zend_error_noreturn(E_COMPILE_ERROR, "Namespace declaration statement has to be "
            "the very first statement or after any declare call in the script");
    }
 
    if (FC(current_namespace)) {
        zend_string_release_ex(FC(current_namespace), 0);
    }
 
    if (name_ast) {
        name = zend_ast_get_str(name_ast);
 
        if (zend_string_equals_literal_ci(name, "namespace")) {
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot use '%s' as namespace name", ZSTR_VAL(name));
        }
 
        FC(current_namespace) = zend_string_copy(name);
    } else {
        FC(current_namespace) = NULL;
    }
 
    zend_reset_import_tables();
 
    FC(in_namespace) = 1;
    if (with_bracket) {
        FC(has_bracketed_namespaces) = 1;
    }
 
    if (stmt_ast) {
        zend_compile_top_stmt(stmt_ast);
        zend_end_namespace();
    }
}
/* }}} */
 
static void zend_compile_halt_compiler(zend_ast *ast) /* {{{ */
{
    zend_ast *offset_ast = ast->child[0];
    zend_long offset = Z_LVAL_P(zend_ast_get_zval(offset_ast));
 
    zend_string *filename, *name;
    const char const_name[] = "__COMPILER_HALT_OFFSET__";
 
    if (FC(has_bracketed_namespaces) && FC(in_namespace)) {
        zend_error_noreturn(E_COMPILE_ERROR,
            "__HALT_COMPILER() can only be used from the outermost scope");
    }
 
    filename = zend_get_compiled_filename();
    name = zend_mangle_property_name(const_name, sizeof(const_name) - 1,
        ZSTR_VAL(filename), ZSTR_LEN(filename), 0);
 
    zend_register_long_constant(ZSTR_VAL(name), ZSTR_LEN(name), offset, 0, 0);
    zend_string_release_ex(name, 0);
}
/* }}} */
 
static bool zend_try_ct_eval_magic_const(zval *zv, zend_ast *ast) /* {{{ */
{
    zend_op_array *op_array = CG(active_op_array);
    zend_class_entry *ce = CG(active_class_entry);
 
    switch (ast->attr) {
        case T_LINE:
            ZVAL_LONG(zv, ast->lineno);
            break;
        case T_FILE:
            ZVAL_STR_COPY(zv, CG(compiled_filename));
            break;
        case T_DIR:
        {
            zend_string *filename = CG(compiled_filename);
            zend_string *dirname = zend_string_init(ZSTR_VAL(filename), ZSTR_LEN(filename), 0);
#ifdef ZEND_WIN32
            ZSTR_LEN(dirname) = php_win32_ioutil_dirname(ZSTR_VAL(dirname), ZSTR_LEN(dirname));
#else
            ZSTR_LEN(dirname) = zend_dirname(ZSTR_VAL(dirname), ZSTR_LEN(dirname));
#endif
 
            if (zend_string_equals_literal(dirname, ".")) {
                dirname = zend_string_extend(dirname, MAXPATHLEN, 0);
#ifdef HAVE_GETCWD
                ZEND_IGNORE_VALUE(VCWD_GETCWD(ZSTR_VAL(dirname), MAXPATHLEN));
#elif defined(HAVE_GETWD)
                ZEND_IGNORE_VALUE(VCWD_GETWD(ZSTR_VAL(dirname)));
#endif
                ZSTR_LEN(dirname) = strlen(ZSTR_VAL(dirname));
            }
 
            ZVAL_STR(zv, dirname);
            break;
        }
        case T_FUNC_C:
            if (op_array && op_array->function_name) {
                ZVAL_STR_COPY(zv, op_array->function_name);
            } else {
                ZVAL_EMPTY_STRING(zv);
            }
            break;
        case T_PROPERTY_C: {
            const zend_property_info *prop_info = CG(context).active_property_info;
            if (prop_info) {
                ZVAL_STR(zv, zend_copy_unmangled_prop_name(prop_info->name));
            } else {
                ZVAL_EMPTY_STRING(zv);
            }
            break;
        }
        case T_METHOD_C:
            /* Detect whether we are directly inside a class (e.g. a class constant) and treat
             * this as not being inside a function. */
            if (op_array && ce && !op_array->scope && !(op_array->fn_flags & ZEND_ACC_CLOSURE)) {
                op_array = NULL;
            }
            if (op_array && op_array->function_name) {
                if (op_array->scope) {
                    ZVAL_NEW_STR(zv,
                        zend_create_member_string(op_array->scope->name, op_array->function_name));
                } else {
                    ZVAL_STR_COPY(zv, op_array->function_name);
                }
            } else {
                ZVAL_EMPTY_STRING(zv);
            }
            break;
        case T_CLASS_C:
            if (ce) {
                if ((ce->ce_flags & ZEND_ACC_TRAIT) != 0) {
                    return 0;
                } else {
                    ZVAL_STR_COPY(zv, ce->name);
                }
            } else {
                ZVAL_EMPTY_STRING(zv);
            }
            break;
        case T_TRAIT_C:
            if (ce && (ce->ce_flags & ZEND_ACC_TRAIT) != 0) {
                ZVAL_STR_COPY(zv, ce->name);
            } else {
                ZVAL_EMPTY_STRING(zv);
            }
            break;
        case T_NS_C:
            if (FC(current_namespace)) {
                ZVAL_STR_COPY(zv, FC(current_namespace));
            } else {
                ZVAL_EMPTY_STRING(zv);
            }
            break;
        EMPTY_SWITCH_DEFAULT_CASE()
    }
 
    return 1;
}
/* }}} */
 
ZEND_API bool zend_is_op_long_compatible(const zval *op)
{
    if (Z_TYPE_P(op) == IS_ARRAY) {
        return false;
    }
 
    if (Z_TYPE_P(op) == IS_DOUBLE
        && !zend_is_long_compatible(Z_DVAL_P(op), zend_dval_to_lval(Z_DVAL_P(op)))) {
        return false;
    }
 
    if (Z_TYPE_P(op) == IS_STRING) {
        double dval = 0;
        uint8_t is_num = is_numeric_str_function(Z_STR_P(op), NULL, &dval);
        if (is_num == 0 || (is_num == IS_DOUBLE && !zend_is_long_compatible(dval, zend_dval_to_lval(dval)))) {
            return false;
        }
    }
 
    return true;
}
 
ZEND_API bool zend_binary_op_produces_error(uint32_t opcode, const zval *op1, const zval *op2) /* {{{ */
{
    if ((opcode == ZEND_CONCAT || opcode == ZEND_FAST_CONCAT)) {
        /* Array to string warning. */
        return Z_TYPE_P(op1) == IS_ARRAY || Z_TYPE_P(op2) == IS_ARRAY;
    }
 
    if (!(opcode == ZEND_ADD || opcode == ZEND_SUB || opcode == ZEND_MUL || opcode == ZEND_DIV
               || opcode == ZEND_POW || opcode == ZEND_MOD || opcode == ZEND_SL || opcode == ZEND_SR
               || opcode == ZEND_BW_OR || opcode == ZEND_BW_AND || opcode == ZEND_BW_XOR)) {
        /* Only the numeric operations throw errors. */
        return 0;
    }
 
    if (Z_TYPE_P(op1) == IS_ARRAY || Z_TYPE_P(op2) == IS_ARRAY) {
        if (opcode == ZEND_ADD && Z_TYPE_P(op1) == IS_ARRAY && Z_TYPE_P(op2) == IS_ARRAY) {
            /* Adding two arrays is allowed. */
            return 0;
        }
 
        /* Numeric operators throw when one of the operands is an array. */
        return 1;
    }
 
    /* While basic arithmetic operators always produce numeric string errors,
     * bitwise operators don't produce errors if both operands are strings */
    if ((opcode == ZEND_BW_OR || opcode == ZEND_BW_AND || opcode == ZEND_BW_XOR)
        && Z_TYPE_P(op1) == IS_STRING && Z_TYPE_P(op2) == IS_STRING) {
        return 0;
    }
 
    if (Z_TYPE_P(op1) == IS_STRING
        && !is_numeric_string(Z_STRVAL_P(op1), Z_STRLEN_P(op1), NULL, NULL, 0)) {
        return 1;
    }
 
    if (Z_TYPE_P(op2) == IS_STRING
        && !is_numeric_string(Z_STRVAL_P(op2), Z_STRLEN_P(op2), NULL, NULL, 0)) {
        return 1;
    }
 
    if ((opcode == ZEND_MOD && zval_get_long(op2) == 0)
            || (opcode == ZEND_DIV && zval_get_double(op2) == 0.0)) {
        /* Division by zero throws an error. */
        return 1;
    }
    if ((opcode == ZEND_POW) && zval_get_double(op1) == 0 && zval_get_double(op2) < 0) {
        /* 0 ** (<0) throws a division by zero error. */
        return 1;
    }
    if ((opcode == ZEND_SL || opcode == ZEND_SR) && zval_get_long(op2) < 0) {
        /* Shift by negative number throws an error. */
        return 1;
    }
 
    /* Operation which cast float/float-strings to integers might produce incompatible float to int errors */
    if (opcode == ZEND_SL || opcode == ZEND_SR || opcode == ZEND_BW_OR
            || opcode == ZEND_BW_AND || opcode == ZEND_BW_XOR || opcode == ZEND_MOD) {
        return !zend_is_op_long_compatible(op1) || !zend_is_op_long_compatible(op2);
    }
 
    return 0;
}
/* }}} */
 
static inline bool zend_try_ct_eval_binary_op(zval *result, uint32_t opcode, zval *op1, zval *op2) /* {{{ */
{
    if (zend_binary_op_produces_error(opcode, op1, op2)) {
        return 0;
    }
 
    binary_op_type fn = get_binary_op(opcode);
    fn(result, op1, op2);
    return 1;
}
/* }}} */
 
ZEND_API bool zend_unary_op_produces_error(uint32_t opcode, const zval *op)
{
    if (opcode == ZEND_BW_NOT) {
        /* BW_NOT on string does not convert the string into an integer. */
        if (Z_TYPE_P(op) == IS_STRING) {
            return 0;
        }
        return Z_TYPE_P(op) <= IS_TRUE || !zend_is_op_long_compatible(op);
    }
 
    return 0;
}
 
static inline bool zend_try_ct_eval_unary_op(zval *result, uint32_t opcode, zval *op) /* {{{ */
{
    if (zend_unary_op_produces_error(opcode, op)) {
        return 0;
    }
 
    unary_op_type fn = get_unary_op(opcode);
    fn(result, op);
    return 1;
}
/* }}} */
 
static inline bool zend_try_ct_eval_unary_pm(zval *result, zend_ast_kind kind, zval *op) /* {{{ */
{
    zval right;
    ZVAL_LONG(&right, (kind == ZEND_AST_UNARY_PLUS) ? 1 : -1);
    return zend_try_ct_eval_binary_op(result, ZEND_MUL, op, &right);
}
/* }}} */
 
static inline void zend_ct_eval_greater(zval *result, zend_ast_kind kind, zval *op1, zval *op2) /* {{{ */
{
    binary_op_type fn = kind == ZEND_AST_GREATER
        ? is_smaller_function : is_smaller_or_equal_function;
    fn(result, op2, op1);
}
/* }}} */
 
static bool zend_try_ct_eval_array(zval *result, zend_ast *ast) /* {{{ */
{
    zend_ast_list *list = zend_ast_get_list(ast);
    zend_ast *last_elem_ast = NULL;
    uint32_t i;
    bool is_constant = 1;
 
    if (ast->attr == ZEND_ARRAY_SYNTAX_LIST) {
        zend_error(E_COMPILE_ERROR, "Cannot use list() as standalone expression");
    }
 
    /* First ensure that *all* child nodes are constant and by-val */
    for (i = 0; i < list->children; ++i) {
        zend_ast *elem_ast = list->child[i];
 
        if (elem_ast == NULL) {
            /* Report error at line of last non-empty element */
            if (last_elem_ast) {
                CG(zend_lineno) = zend_ast_get_lineno(last_elem_ast);
            }
            zend_error(E_COMPILE_ERROR, "Cannot use empty array elements in arrays");
        }
 
        if (elem_ast->kind != ZEND_AST_UNPACK) {
            zend_eval_const_expr(&elem_ast->child[0]);
            zend_eval_const_expr(&elem_ast->child[1]);
 
            if (elem_ast->attr /* by_ref */ || elem_ast->child[0]->kind != ZEND_AST_ZVAL
                || (elem_ast->child[1] && elem_ast->child[1]->kind != ZEND_AST_ZVAL)
            ) {
                is_constant = 0;
            }
        } else {
            zend_eval_const_expr(&elem_ast->child[0]);
 
            if (elem_ast->child[0]->kind != ZEND_AST_ZVAL) {
                is_constant = 0;
            }
        }
 
        last_elem_ast = elem_ast;
    }
 
    if (!is_constant) {
        return 0;
    }
 
    if (!list->children) {
        ZVAL_EMPTY_ARRAY(result);
        return 1;
    }
 
    array_init_size(result, list->children);
    for (i = 0; i < list->children; ++i) {
        zend_ast *elem_ast = list->child[i];
        zend_ast *value_ast = elem_ast->child[0];
        zend_ast *key_ast;
 
        zval *value = zend_ast_get_zval(value_ast);
        if (elem_ast->kind == ZEND_AST_UNPACK) {
            if (Z_TYPE_P(value) == IS_ARRAY) {
                HashTable *ht = Z_ARRVAL_P(value);
                zval *val;
                zend_string *key;
 
                ZEND_HASH_FOREACH_STR_KEY_VAL(ht, key, val) {
                    if (key) {
                        zend_hash_update(Z_ARRVAL_P(result), key, val);
                    } else if (!zend_hash_next_index_insert(Z_ARRVAL_P(result), val)) {
                        zval_ptr_dtor(result);
                        return 0;
                    }
                    Z_TRY_ADDREF_P(val);
                } ZEND_HASH_FOREACH_END();
 
                continue;
            } else {
                zend_error_noreturn(E_COMPILE_ERROR, "Only arrays and Traversables can be unpacked, %s given", zend_zval_value_name(value));
            }
        }
 
        Z_TRY_ADDREF_P(value);
 
        key_ast = elem_ast->child[1];
        if (key_ast) {
            zval *key = zend_ast_get_zval(key_ast);
            switch (Z_TYPE_P(key)) {
                case IS_LONG:
                    zend_hash_index_update(Z_ARRVAL_P(result), Z_LVAL_P(key), value);
                    break;
                case IS_STRING:
                    zend_symtable_update(Z_ARRVAL_P(result), Z_STR_P(key), value);
                    break;
                case IS_DOUBLE: {
                    zend_long lval = zend_dval_to_lval(Z_DVAL_P(key));
                    /* Incompatible float will generate an error, leave this to run-time */
                    if (!zend_is_long_compatible(Z_DVAL_P(key), lval)) {
                        zval_ptr_dtor_nogc(value);
                        zval_ptr_dtor(result);
                        return 0;
                    }
                    zend_hash_index_update(Z_ARRVAL_P(result), lval, value);
                    break;
                }
                case IS_FALSE:
                    zend_hash_index_update(Z_ARRVAL_P(result), 0, value);
                    break;
                case IS_TRUE:
                    zend_hash_index_update(Z_ARRVAL_P(result), 1, value);
                    break;
                case IS_NULL:
                    zend_hash_update(Z_ARRVAL_P(result), ZSTR_EMPTY_ALLOC(), value);
                    break;
                default:
                    zend_error_noreturn(E_COMPILE_ERROR, "Illegal offset type");
                    break;
            }
        } else if (!zend_hash_next_index_insert(Z_ARRVAL_P(result), value)) {
            zval_ptr_dtor_nogc(value);
            zval_ptr_dtor(result);
            return 0;
        }
    }
 
    return 1;
}
/* }}} */
 
static void zend_compile_binary_op(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *left_ast = ast->child[0];
    zend_ast *right_ast = ast->child[1];
    uint32_t opcode = ast->attr;
 
    znode left_node, right_node;
 
    zend_compile_expr(&left_node, left_ast);
    zend_compile_expr(&right_node, right_ast);
 
    if (left_node.op_type == IS_CONST && right_node.op_type == IS_CONST) {
        if (zend_try_ct_eval_binary_op(&result->u.constant, opcode,
                &left_node.u.constant, &right_node.u.constant)
        ) {
            result->op_type = IS_CONST;
            zval_ptr_dtor(&left_node.u.constant);
            zval_ptr_dtor(&right_node.u.constant);
            return;
        }
    }
 
    do {
        if (opcode == ZEND_IS_EQUAL || opcode == ZEND_IS_NOT_EQUAL) {
            if (left_node.op_type == IS_CONST) {
                if (Z_TYPE(left_node.u.constant) == IS_FALSE) {
                    opcode = (opcode == ZEND_IS_NOT_EQUAL) ? ZEND_BOOL : ZEND_BOOL_NOT;
                    zend_emit_op_tmp(result, opcode, &right_node, NULL);
                    break;
                } else if (Z_TYPE(left_node.u.constant) == IS_TRUE) {
                    opcode = (opcode == ZEND_IS_EQUAL) ? ZEND_BOOL : ZEND_BOOL_NOT;
                    zend_emit_op_tmp(result, opcode, &right_node, NULL);
                    break;
                }
            } else if (right_node.op_type == IS_CONST) {
                if (Z_TYPE(right_node.u.constant) == IS_FALSE) {
                    opcode = (opcode == ZEND_IS_NOT_EQUAL) ? ZEND_BOOL : ZEND_BOOL_NOT;
                    zend_emit_op_tmp(result, opcode, &left_node, NULL);
                    break;
                } else if (Z_TYPE(right_node.u.constant) == IS_TRUE) {
                    opcode = (opcode == ZEND_IS_EQUAL) ? ZEND_BOOL : ZEND_BOOL_NOT;
                    zend_emit_op_tmp(result, opcode, &left_node, NULL);
                    break;
                }
            }
        } else if (opcode == ZEND_IS_IDENTICAL || opcode == ZEND_IS_NOT_IDENTICAL) {
            /* convert $x === null to is_null($x) (i.e. ZEND_TYPE_CHECK opcode). Do the same thing for false/true. (covers IS_NULL, IS_FALSE, and IS_TRUE) */
            if (left_node.op_type == IS_CONST) {
                if (Z_TYPE(left_node.u.constant) <= IS_TRUE && Z_TYPE(left_node.u.constant) >= IS_NULL) {
                    zend_op *opline = zend_emit_op_tmp(result, ZEND_TYPE_CHECK, &right_node, NULL);
                    opline->extended_value =
                        (opcode == ZEND_IS_IDENTICAL) ?
                            (1 << Z_TYPE(left_node.u.constant)) :
                            (MAY_BE_ANY - (1 << Z_TYPE(left_node.u.constant)));
                    return;
                }
            } else if (right_node.op_type == IS_CONST) {
                if (Z_TYPE(right_node.u.constant) <= IS_TRUE && Z_TYPE(right_node.u.constant) >= IS_NULL) {
                    zend_op *opline = zend_emit_op_tmp(result, ZEND_TYPE_CHECK, &left_node, NULL);
                    opline->extended_value =
                        (opcode == ZEND_IS_IDENTICAL) ?
                            (1 << Z_TYPE(right_node.u.constant)) :
                            (MAY_BE_ANY - (1 << Z_TYPE(right_node.u.constant)));
                    return;
                }
            }
        } else if (opcode == ZEND_CONCAT) {
            /* convert constant operands to strings at compile-time */
            if (left_node.op_type == IS_CONST) {
                if (Z_TYPE(left_node.u.constant) == IS_ARRAY) {
                    zend_emit_op_tmp(&left_node, ZEND_CAST, &left_node, NULL)->extended_value = IS_STRING;
                } else {
                    convert_to_string(&left_node.u.constant);
                }
            }
            if (right_node.op_type == IS_CONST) {
                if (Z_TYPE(right_node.u.constant) == IS_ARRAY) {
                    zend_emit_op_tmp(&right_node, ZEND_CAST, &right_node, NULL)->extended_value = IS_STRING;
                } else {
                    convert_to_string(&right_node.u.constant);
                }
            }
            if (left_node.op_type == IS_CONST && right_node.op_type == IS_CONST) {
                opcode = ZEND_FAST_CONCAT;
            }
        }
        zend_emit_op_tmp(result, opcode, &left_node, &right_node);
    } while (0);
}
/* }}} */
 
/* We do not use zend_compile_binary_op for this because we want to retain the left-to-right
 * evaluation order. */
static void zend_compile_greater(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *left_ast = ast->child[0];
    zend_ast *right_ast = ast->child[1];
    znode left_node, right_node;
 
    ZEND_ASSERT(ast->kind == ZEND_AST_GREATER || ast->kind == ZEND_AST_GREATER_EQUAL);
 
    zend_compile_expr(&left_node, left_ast);
    zend_compile_expr(&right_node, right_ast);
 
    if (left_node.op_type == IS_CONST && right_node.op_type == IS_CONST) {
        result->op_type = IS_CONST;
        zend_ct_eval_greater(&result->u.constant, ast->kind,
            &left_node.u.constant, &right_node.u.constant);
        zval_ptr_dtor(&left_node.u.constant);
        zval_ptr_dtor(&right_node.u.constant);
        return;
    }
 
    zend_emit_op_tmp(result,
        ast->kind == ZEND_AST_GREATER ? ZEND_IS_SMALLER : ZEND_IS_SMALLER_OR_EQUAL,
        &right_node, &left_node);
}
/* }}} */
 
static void zend_compile_unary_op(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *expr_ast = ast->child[0];
    uint32_t opcode = ast->attr;
 
    znode expr_node;
    zend_compile_expr(&expr_node, expr_ast);
 
    if (expr_node.op_type == IS_CONST
            && zend_try_ct_eval_unary_op(&result->u.constant, opcode, &expr_node.u.constant)) {
        result->op_type = IS_CONST;
        zval_ptr_dtor(&expr_node.u.constant);
        return;
    }
 
    zend_emit_op_tmp(result, opcode, &expr_node, NULL);
}
/* }}} */
 
static void zend_compile_unary_pm(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *expr_ast = ast->child[0];
    znode expr_node, right_node;
 
    ZEND_ASSERT(ast->kind == ZEND_AST_UNARY_PLUS || ast->kind == ZEND_AST_UNARY_MINUS);
 
    zend_compile_expr(&expr_node, expr_ast);
 
    if (expr_node.op_type == IS_CONST
        && zend_try_ct_eval_unary_pm(&result->u.constant, ast->kind, &expr_node.u.constant)) {
        result->op_type = IS_CONST;
        zval_ptr_dtor(&expr_node.u.constant);
        return;
    }
 
    right_node.op_type = IS_CONST;
    ZVAL_LONG(&right_node.u.constant, (ast->kind == ZEND_AST_UNARY_PLUS) ? 1 : -1);
    zend_emit_op_tmp(result, ZEND_MUL, &expr_node, &right_node);
}
/* }}} */
 
static void zend_compile_short_circuiting(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *left_ast = ast->child[0];
    zend_ast *right_ast = ast->child[1];
 
    znode left_node, right_node;
    zend_op *opline_jmpz, *opline_bool;
    uint32_t opnum_jmpz;
 
    ZEND_ASSERT(ast->kind == ZEND_AST_AND || ast->kind == ZEND_AST_OR);
 
    zend_compile_expr(&left_node, left_ast);
 
    if (left_node.op_type == IS_CONST) {
        if ((ast->kind == ZEND_AST_AND && !zend_is_true(&left_node.u.constant))
         || (ast->kind == ZEND_AST_OR && zend_is_true(&left_node.u.constant))) {
            result->op_type = IS_CONST;
            ZVAL_BOOL(&result->u.constant, zend_is_true(&left_node.u.constant));
        } else {
            zend_compile_expr(&right_node, right_ast);
 
            if (right_node.op_type == IS_CONST) {
                result->op_type = IS_CONST;
                ZVAL_BOOL(&result->u.constant, zend_is_true(&right_node.u.constant));
 
                zval_ptr_dtor(&right_node.u.constant);
            } else {
                zend_emit_op_tmp(result, ZEND_BOOL, &right_node, NULL);
            }
        }
 
        zval_ptr_dtor(&left_node.u.constant);
        return;
    }
 
    opnum_jmpz = get_next_op_number();
    opline_jmpz = zend_emit_op(NULL, ast->kind == ZEND_AST_AND ? ZEND_JMPZ_EX : ZEND_JMPNZ_EX,
        &left_node, NULL);
 
    if (left_node.op_type == IS_TMP_VAR) {
        SET_NODE(opline_jmpz->result, &left_node);
        GET_NODE(result, opline_jmpz->result);
    } else {
        zend_make_tmp_result(result, opline_jmpz);
    }
 
    zend_compile_expr(&right_node, right_ast);
 
    opline_bool = zend_emit_op(NULL, ZEND_BOOL, &right_node, NULL);
    SET_NODE(opline_bool->result, result);
 
    zend_update_jump_target_to_next(opnum_jmpz);
}
/* }}} */
 
static void zend_compile_post_incdec(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *var_ast = ast->child[0];
    ZEND_ASSERT(ast->kind == ZEND_AST_POST_INC || ast->kind == ZEND_AST_POST_DEC);
 
    zend_ensure_writable_variable(var_ast);
 
    if (var_ast->kind == ZEND_AST_PROP || var_ast->kind == ZEND_AST_NULLSAFE_PROP) {
        zend_op *opline = zend_compile_prop(NULL, var_ast, BP_VAR_RW, 0);
        opline->opcode = ast->kind == ZEND_AST_POST_INC ? ZEND_POST_INC_OBJ : ZEND_POST_DEC_OBJ;
        zend_make_tmp_result(result, opline);
    } else if (var_ast->kind == ZEND_AST_STATIC_PROP) {
        zend_op *opline = zend_compile_static_prop(NULL, var_ast, BP_VAR_RW, 0, 0);
        opline->opcode = ast->kind == ZEND_AST_POST_INC ? ZEND_POST_INC_STATIC_PROP : ZEND_POST_DEC_STATIC_PROP;
        zend_make_tmp_result(result, opline);
    } else {
        znode var_node;
        zend_op *opline = zend_compile_var(&var_node, var_ast, BP_VAR_RW, 0);
        if (opline && opline->opcode == ZEND_FETCH_DIM_RW) {
            opline->extended_value = ZEND_FETCH_DIM_INCDEC;
        }
        zend_emit_op_tmp(result, ast->kind == ZEND_AST_POST_INC ? ZEND_POST_INC : ZEND_POST_DEC,
            &var_node, NULL);
    }
}
/* }}} */
 
static void zend_compile_pre_incdec(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *var_ast = ast->child[0];
    ZEND_ASSERT(ast->kind == ZEND_AST_PRE_INC || ast->kind == ZEND_AST_PRE_DEC);
 
    zend_ensure_writable_variable(var_ast);
 
    if (var_ast->kind == ZEND_AST_PROP || var_ast->kind == ZEND_AST_NULLSAFE_PROP) {
        zend_op *opline = zend_compile_prop(result, var_ast, BP_VAR_RW, 0);
        opline->opcode = ast->kind == ZEND_AST_PRE_INC ? ZEND_PRE_INC_OBJ : ZEND_PRE_DEC_OBJ;
        opline->result_type = IS_TMP_VAR;
        result->op_type = IS_TMP_VAR;
    } else if (var_ast->kind == ZEND_AST_STATIC_PROP) {
        zend_op *opline = zend_compile_static_prop(result, var_ast, BP_VAR_RW, 0, 0);
        opline->opcode = ast->kind == ZEND_AST_PRE_INC ? ZEND_PRE_INC_STATIC_PROP : ZEND_PRE_DEC_STATIC_PROP;
        opline->result_type = IS_TMP_VAR;
        result->op_type = IS_TMP_VAR;
    } else {
        znode var_node;
        zend_op *opline = zend_compile_var(&var_node, var_ast, BP_VAR_RW, 0);
        if (opline && opline->opcode == ZEND_FETCH_DIM_RW) {
            opline->extended_value = ZEND_FETCH_DIM_INCDEC;
        }
        zend_emit_op_tmp(result, ast->kind == ZEND_AST_PRE_INC ? ZEND_PRE_INC : ZEND_PRE_DEC,
            &var_node, NULL);
    }
}
/* }}} */
 
static void zend_compile_cast(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *expr_ast = ast->child[0];
    znode expr_node;
    zend_op *opline;
 
    zend_compile_expr(&expr_node, expr_ast);
 
    if (ast->attr == _IS_BOOL) {
        opline = zend_emit_op_tmp(result, ZEND_BOOL, &expr_node, NULL);
    } else if (ast->attr == IS_NULL) {
        zend_error(E_COMPILE_ERROR, "The (unset) cast is no longer supported");
    } else {
        opline = zend_emit_op_tmp(result, ZEND_CAST, &expr_node, NULL);
        opline->extended_value = ast->attr;
    }
}
/* }}} */
 
static void zend_compile_shorthand_conditional(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *cond_ast = ast->child[0];
    zend_ast *false_ast = ast->child[2];
 
    znode cond_node, false_node;
    zend_op *opline_qm_assign;
    uint32_t opnum_jmp_set;
 
    ZEND_ASSERT(ast->child[1] == NULL);
 
    zend_compile_expr(&cond_node, cond_ast);
 
    opnum_jmp_set = get_next_op_number();
    zend_emit_op_tmp(result, ZEND_JMP_SET, &cond_node, NULL);
 
    zend_compile_expr(&false_node, false_ast);
 
    opline_qm_assign = zend_emit_op_tmp(NULL, ZEND_QM_ASSIGN, &false_node, NULL);
    SET_NODE(opline_qm_assign->result, result);
 
    zend_update_jump_target_to_next(opnum_jmp_set);
}
/* }}} */
 
static void zend_compile_conditional(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *cond_ast = ast->child[0];
    zend_ast *true_ast = ast->child[1];
    zend_ast *false_ast = ast->child[2];
 
    znode cond_node, true_node, false_node;
    zend_op *opline_qm_assign2;
    uint32_t opnum_jmpz, opnum_jmp;
 
    if (cond_ast->kind == ZEND_AST_CONDITIONAL
            && cond_ast->attr != ZEND_PARENTHESIZED_CONDITIONAL) {
        if (cond_ast->child[1]) {
            if (true_ast) {
                zend_error(E_COMPILE_ERROR,
                    "Unparenthesized `a ? b : c ? d : e` is not supported. "
                    "Use either `(a ? b : c) ? d : e` or `a ? b : (c ? d : e)`");
            } else {
                zend_error(E_COMPILE_ERROR,
                    "Unparenthesized `a ? b : c ?: d` is not supported. "
                    "Use either `(a ? b : c) ?: d` or `a ? b : (c ?: d)`");
            }
        } else {
            if (true_ast) {
                zend_error(E_COMPILE_ERROR,
                    "Unparenthesized `a ?: b ? c : d` is not supported. "
                    "Use either `(a ?: b) ? c : d` or `a ?: (b ? c : d)`");
            } else {
                /* This case is harmless:  (a ?: b) ?: c always produces the same result
                 * as a ?: (b ?: c). */
            }
        }
    }
 
    if (!true_ast) {
        zend_compile_shorthand_conditional(result, ast);
        return;
    }
 
    zend_compile_expr(&cond_node, cond_ast);
 
    opnum_jmpz = zend_emit_cond_jump(ZEND_JMPZ, &cond_node, 0);
 
    zend_compile_expr(&true_node, true_ast);
 
    zend_emit_op_tmp(result, ZEND_QM_ASSIGN, &true_node, NULL);
 
    opnum_jmp = zend_emit_jump(0);
 
    zend_update_jump_target_to_next(opnum_jmpz);
 
    zend_compile_expr(&false_node, false_ast);
 
    opline_qm_assign2 = zend_emit_op(NULL, ZEND_QM_ASSIGN, &false_node, NULL);
    SET_NODE(opline_qm_assign2->result, result);
 
    zend_update_jump_target_to_next(opnum_jmp);
}
/* }}} */
 
static void zend_compile_coalesce(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *expr_ast = ast->child[0];
    zend_ast *default_ast = ast->child[1];
 
    znode expr_node, default_node;
    zend_op *opline;
    uint32_t opnum;
 
    zend_compile_var(&expr_node, expr_ast, BP_VAR_IS, 0);
 
    opnum = get_next_op_number();
    zend_emit_op_tmp(result, ZEND_COALESCE, &expr_node, NULL);
 
    zend_compile_expr(&default_node, default_ast);
 
    opline = zend_emit_op_tmp(NULL, ZEND_QM_ASSIGN, &default_node, NULL);
    SET_NODE(opline->result, result);
 
    opline = &CG(active_op_array)->opcodes[opnum];
    opline->op2.opline_num = get_next_op_number();
}
/* }}} */
 
static void znode_dtor(zval *zv) {
    znode *node = Z_PTR_P(zv);
    if (node->op_type == IS_CONST) {
        zval_ptr_dtor_nogc(&node->u.constant);
    }
    efree(node);
}
 
static void zend_compile_assign_coalesce(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *var_ast = ast->child[0];
    zend_ast *default_ast = ast->child[1];
 
    znode var_node_is, var_node_w, default_node, assign_node, *node;
    zend_op *opline;
    uint32_t coalesce_opnum;
    bool need_frees = 0;
 
    /* Remember expressions compiled during the initial BP_VAR_IS lookup,
     * to avoid double-evaluation when we compile again with BP_VAR_W. */
    HashTable *orig_memoized_exprs = CG(memoized_exprs);
    const zend_memoize_mode orig_memoize_mode = CG(memoize_mode);
 
    zend_ensure_writable_variable(var_ast);
    if (is_this_fetch(var_ast)) {
        zend_error_noreturn(E_COMPILE_ERROR, "Cannot re-assign $this");
    }
 
    ALLOC_HASHTABLE(CG(memoized_exprs));
    zend_hash_init(CG(memoized_exprs), 0, NULL, znode_dtor, 0);
 
    CG(memoize_mode) = ZEND_MEMOIZE_COMPILE;
    zend_compile_var(&var_node_is, var_ast, BP_VAR_IS, 0);
 
    coalesce_opnum = get_next_op_number();
    zend_emit_op_tmp(result, ZEND_COALESCE, &var_node_is, NULL);
 
    CG(memoize_mode) = ZEND_MEMOIZE_NONE;
    if (var_ast->kind == ZEND_AST_DIM) {
        zend_compile_expr_with_potential_assign_to_self(&default_node, default_ast, var_ast);
    } else {
        zend_compile_expr(&default_node, default_ast);
    }
 
    CG(memoize_mode) = ZEND_MEMOIZE_FETCH;
    zend_compile_var(&var_node_w, var_ast, BP_VAR_W, 0);
 
    /* Reproduce some of the zend_compile_assign() opcode fixup logic here. */
    opline = &CG(active_op_array)->opcodes[CG(active_op_array)->last-1];
    /* Treat $GLOBALS['x'] assignment like assignment to variable. */
    zend_ast_kind kind = is_global_var_fetch(var_ast) ? ZEND_AST_VAR : var_ast->kind;
    switch (kind) {
        case ZEND_AST_VAR:
            zend_emit_op_tmp(&assign_node, ZEND_ASSIGN, &var_node_w, &default_node);
            break;
        case ZEND_AST_STATIC_PROP:
            opline->opcode = ZEND_ASSIGN_STATIC_PROP;
            opline->result_type = IS_TMP_VAR;
            var_node_w.op_type = IS_TMP_VAR;
            zend_emit_op_data(&default_node);
            assign_node = var_node_w;
            break;
        case ZEND_AST_DIM:
            opline->opcode = ZEND_ASSIGN_DIM;
            opline->result_type = IS_TMP_VAR;
            var_node_w.op_type = IS_TMP_VAR;
            zend_emit_op_data(&default_node);
            assign_node = var_node_w;
            break;
        case ZEND_AST_PROP:
        case ZEND_AST_NULLSAFE_PROP:
            opline->opcode = ZEND_ASSIGN_OBJ;
            opline->result_type = IS_TMP_VAR;
            var_node_w.op_type = IS_TMP_VAR;
            zend_emit_op_data(&default_node);
            assign_node = var_node_w;
            break;
        EMPTY_SWITCH_DEFAULT_CASE();
    }
 
    opline = zend_emit_op_tmp(NULL, ZEND_QM_ASSIGN, &assign_node, NULL);
    SET_NODE(opline->result, result);
 
    ZEND_HASH_FOREACH_PTR(CG(memoized_exprs), node) {
        if (node->op_type == IS_TMP_VAR || node->op_type == IS_VAR) {
            need_frees = 1;
            break;
        }
    } ZEND_HASH_FOREACH_END();
 
    /* Free DUPed expressions if there are any */
    if (need_frees) {
        uint32_t jump_opnum = zend_emit_jump(0);
        zend_update_jump_target_to_next(coalesce_opnum);
        ZEND_HASH_FOREACH_PTR(CG(memoized_exprs), node) {
            if (node->op_type == IS_TMP_VAR || node->op_type == IS_VAR) {
                zend_emit_op(NULL, ZEND_FREE, node, NULL);
            }
        } ZEND_HASH_FOREACH_END();
        zend_update_jump_target_to_next(jump_opnum);
    } else {
        zend_update_jump_target_to_next(coalesce_opnum);
    }
 
    zend_hash_destroy(CG(memoized_exprs));
    FREE_HASHTABLE(CG(memoized_exprs));
    CG(memoized_exprs) = orig_memoized_exprs;
    CG(memoize_mode) = orig_memoize_mode;
}
/* }}} */
 
static void zend_compile_print(znode *result, zend_ast *ast) /* {{{ */
{
    zend_op *opline;
    zend_ast *expr_ast = ast->child[0];
 
    znode expr_node;
    zend_compile_expr(&expr_node, expr_ast);
 
    opline = zend_emit_op(NULL, ZEND_ECHO, &expr_node, NULL);
    opline->extended_value = 1;
 
    result->op_type = IS_CONST;
    ZVAL_LONG(&result->u.constant, 1);
}
/* }}} */
 
static void zend_compile_yield(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *value_ast = ast->child[0];
    zend_ast *key_ast = ast->child[1];
 
    znode value_node, key_node;
    znode *value_node_ptr = NULL, *key_node_ptr = NULL;
    zend_op *opline;
    bool returns_by_ref = (CG(active_op_array)->fn_flags & ZEND_ACC_RETURN_REFERENCE) != 0;
 
    zend_mark_function_as_generator();
 
    if (key_ast) {
        zend_compile_expr(&key_node, key_ast);
        key_node_ptr = &key_node;
    }
 
    if (value_ast) {
        if (returns_by_ref && zend_is_variable(value_ast)) {
            zend_assert_not_short_circuited(value_ast);
            zend_compile_var(&value_node, value_ast, BP_VAR_W, 1);
        } else {
            zend_compile_expr(&value_node, value_ast);
        }
        value_node_ptr = &value_node;
    }
 
    opline = zend_emit_op(result, ZEND_YIELD, value_node_ptr, key_node_ptr);
 
    if (value_ast && returns_by_ref && zend_is_call(value_ast)) {
        opline->extended_value = ZEND_RETURNS_FUNCTION;
    }
}
/* }}} */
 
static void zend_compile_yield_from(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *expr_ast = ast->child[0];
    znode expr_node;
 
    zend_mark_function_as_generator();
 
    if (CG(active_op_array)->fn_flags & ZEND_ACC_RETURN_REFERENCE) {
        zend_error_noreturn(E_COMPILE_ERROR,
            "Cannot use \"yield from\" inside a by-reference generator");
    }
 
    zend_compile_expr(&expr_node, expr_ast);
    zend_emit_op_tmp(result, ZEND_YIELD_FROM, &expr_node, NULL);
}
/* }}} */
 
static void zend_compile_instanceof(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *obj_ast = ast->child[0];
    zend_ast *class_ast = ast->child[1];
 
    znode obj_node, class_node;
    zend_op *opline;
 
    zend_compile_expr(&obj_node, obj_ast);
    if (obj_node.op_type == IS_CONST) {
        zend_do_free(&obj_node);
        result->op_type = IS_CONST;
        ZVAL_FALSE(&result->u.constant);
        return;
    }
 
    zend_compile_class_ref(&class_node, class_ast,
        ZEND_FETCH_CLASS_NO_AUTOLOAD | ZEND_FETCH_CLASS_EXCEPTION | ZEND_FETCH_CLASS_SILENT);
 
    opline = zend_emit_op_tmp(result, ZEND_INSTANCEOF, &obj_node, NULL);
 
    if (class_node.op_type == IS_CONST) {
        opline->op2_type = IS_CONST;
        opline->op2.constant = zend_add_class_name_literal(
            Z_STR(class_node.u.constant));
        opline->extended_value = zend_alloc_cache_slot();
    } else {
        SET_NODE(opline->op2, &class_node);
    }
}
/* }}} */
 
static void zend_compile_include_or_eval(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *expr_ast = ast->child[0];
    znode expr_node;
    zend_op *opline;
 
    zend_do_extended_fcall_begin();
    zend_compile_expr(&expr_node, expr_ast);
 
    opline = zend_emit_op(result, ZEND_INCLUDE_OR_EVAL, &expr_node, NULL);
    opline->extended_value = ast->attr;
 
    zend_do_extended_fcall_end();
}
/* }}} */
 
static void zend_compile_isset_or_empty(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *var_ast = ast->child[0];
 
    znode var_node;
    zend_op *opline = NULL;
 
    ZEND_ASSERT(ast->kind == ZEND_AST_ISSET || ast->kind == ZEND_AST_EMPTY);
 
    if (!zend_is_variable(var_ast)) {
        if (ast->kind == ZEND_AST_EMPTY) {
            /* empty(expr) can be transformed to !expr */
            zend_ast *not_ast = zend_ast_create_ex(ZEND_AST_UNARY_OP, ZEND_BOOL_NOT, var_ast);
            zend_compile_expr(result, not_ast);
            return;
        } else {
            zend_error_noreturn(E_COMPILE_ERROR,
                "Cannot use isset() on the result of an expression "
                "(you can use \"null !== expression\" instead)");
        }
    }
 
    if (is_globals_fetch(var_ast)) {
        result->op_type = IS_CONST;
        ZVAL_BOOL(&result->u.constant, ast->kind == ZEND_AST_ISSET);
        return;
    }
 
    if (is_global_var_fetch(var_ast)) {
        if (!var_ast->child[1]) {
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot use [] for reading");
        }
 
        zend_compile_expr(&var_node, var_ast->child[1]);
        if (var_node.op_type == IS_CONST) {
            convert_to_string(&var_node.u.constant);
        }
 
        opline = zend_emit_op_tmp(result, ZEND_ISSET_ISEMPTY_VAR, &var_node, NULL);
        opline->extended_value =
            ZEND_FETCH_GLOBAL | (ast->kind == ZEND_AST_EMPTY ? ZEND_ISEMPTY : 0);
        return;
    }
 
    zend_short_circuiting_mark_inner(var_ast);
    switch (var_ast->kind) {
        case ZEND_AST_VAR:
            if (is_this_fetch(var_ast)) {
                opline = zend_emit_op(result, ZEND_ISSET_ISEMPTY_THIS, NULL, NULL);
                CG(active_op_array)->fn_flags |= ZEND_ACC_USES_THIS;
            } else if (zend_try_compile_cv(&var_node, var_ast) == SUCCESS) {
                opline = zend_emit_op(result, ZEND_ISSET_ISEMPTY_CV, &var_node, NULL);
            } else {
                opline = zend_compile_simple_var_no_cv(result, var_ast, BP_VAR_IS, 0);
                opline->opcode = ZEND_ISSET_ISEMPTY_VAR;
            }
            break;
        case ZEND_AST_DIM:
            opline = zend_compile_dim(result, var_ast, BP_VAR_IS, /* by_ref */ false);
            opline->opcode = ZEND_ISSET_ISEMPTY_DIM_OBJ;
            break;
        case ZEND_AST_PROP:
        case ZEND_AST_NULLSAFE_PROP:
            opline = zend_compile_prop(result, var_ast, BP_VAR_IS, 0);
            opline->opcode = ZEND_ISSET_ISEMPTY_PROP_OBJ;
            break;
        case ZEND_AST_STATIC_PROP:
            opline = zend_compile_static_prop(result, var_ast, BP_VAR_IS, 0, 0);
            opline->opcode = ZEND_ISSET_ISEMPTY_STATIC_PROP;
            break;
        EMPTY_SWITCH_DEFAULT_CASE()
    }
 
    result->op_type = opline->result_type = IS_TMP_VAR;
    if (!(ast->kind == ZEND_AST_ISSET)) {
        opline->extended_value |= ZEND_ISEMPTY;
    }
}
/* }}} */
 
static void zend_compile_silence(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *expr_ast = ast->child[0];
    znode silence_node;
 
    zend_emit_op_tmp(&silence_node, ZEND_BEGIN_SILENCE, NULL, NULL);
 
    if (expr_ast->kind == ZEND_AST_VAR) {
        /* For @$var we need to force a FETCH instruction, otherwise the CV access will
         * happen outside the silenced section. */
        zend_compile_simple_var_no_cv(result, expr_ast, BP_VAR_R, 0 );
    } else {
        zend_compile_expr(result, expr_ast);
    }
 
    zend_emit_op(NULL, ZEND_END_SILENCE, &silence_node, NULL);
}
/* }}} */
 
static void zend_compile_shell_exec(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *expr_ast = ast->child[0];
 
    zval fn_name;
    zend_ast *name_ast, *args_ast, *call_ast;
 
    ZVAL_STRING(&fn_name, "shell_exec");
    name_ast = zend_ast_create_zval(&fn_name);
    args_ast = zend_ast_create_list(1, ZEND_AST_ARG_LIST, expr_ast);
    call_ast = zend_ast_create(ZEND_AST_CALL, name_ast, args_ast);
 
    zend_compile_expr(result, call_ast);
 
    zval_ptr_dtor(&fn_name);
}
/* }}} */
 
static void zend_compile_array(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast_list *list = zend_ast_get_list(ast);
    zend_op *opline;
    uint32_t i, opnum_init = -1;
    bool packed = 1;
 
    if (zend_try_ct_eval_array(&result->u.constant, ast)) {
        result->op_type = IS_CONST;
        return;
    }
 
    /* Empty arrays are handled at compile-time */
    ZEND_ASSERT(list->children > 0);
 
    for (i = 0; i < list->children; ++i) {
        zend_ast *elem_ast = list->child[i];
        zend_ast *value_ast, *key_ast;
        bool by_ref;
        znode value_node, key_node, *key_node_ptr = NULL;
 
        if (elem_ast == NULL) {
            zend_error(E_COMPILE_ERROR, "Cannot use empty array elements in arrays");
        }
 
        value_ast = elem_ast->child[0];
 
        if (elem_ast->kind == ZEND_AST_UNPACK) {
            zend_compile_expr(&value_node, value_ast);
            if (i == 0) {
                opnum_init = get_next_op_number();
                opline = zend_emit_op_tmp(result, ZEND_INIT_ARRAY, NULL, NULL);
            }
            opline = zend_emit_op(NULL, ZEND_ADD_ARRAY_UNPACK, &value_node, NULL);
            SET_NODE(opline->result, result);
            continue;
        }
 
        key_ast = elem_ast->child[1];
        by_ref = elem_ast->attr;
 
        if (key_ast) {
            zend_compile_expr(&key_node, key_ast);
            zend_handle_numeric_op(&key_node);
            key_node_ptr = &key_node;
        }
 
        if (by_ref) {
            zend_ensure_writable_variable(value_ast);
            zend_compile_var(&value_node, value_ast, BP_VAR_W, 1);
        } else {
            zend_compile_expr(&value_node, value_ast);
        }
 
        if (i == 0) {
            opnum_init = get_next_op_number();
            opline = zend_emit_op_tmp(result, ZEND_INIT_ARRAY, &value_node, key_node_ptr);
            opline->extended_value = list->children << ZEND_ARRAY_SIZE_SHIFT;
        } else {
            opline = zend_emit_op(NULL, ZEND_ADD_ARRAY_ELEMENT,
                &value_node, key_node_ptr);
            SET_NODE(opline->result, result);
        }
        opline->extended_value |= by_ref;
 
        if (key_ast && key_node.op_type == IS_CONST && Z_TYPE(key_node.u.constant) == IS_STRING) {
            packed = 0;
        }
    }
 
    /* Add a flag to INIT_ARRAY if we know this array cannot be packed */
    if (!packed) {
        ZEND_ASSERT(opnum_init != (uint32_t)-1);
        opline = &CG(active_op_array)->opcodes[opnum_init];
        opline->extended_value |= ZEND_ARRAY_NOT_PACKED;
    }
}
/* }}} */
 
static void zend_compile_const(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *name_ast = ast->child[0];
 
    zend_op *opline;
 
    bool is_fully_qualified;
    zend_string *orig_name = zend_ast_get_str(name_ast);
    zend_string *resolved_name = zend_resolve_const_name(orig_name, name_ast->attr, &is_fully_qualified);
 
    if (zend_string_equals_literal(resolved_name, "__COMPILER_HALT_OFFSET__") || (name_ast->attr != ZEND_NAME_RELATIVE && zend_string_equals_literal(orig_name, "__COMPILER_HALT_OFFSET__"))) {
        zend_ast *last = CG(ast);
 
        while (last && last->kind == ZEND_AST_STMT_LIST) {
            zend_ast_list *list = zend_ast_get_list(last);
            if (list->children == 0) {
                break;
            }
            last = list->child[list->children-1];
        }
        if (last && last->kind == ZEND_AST_HALT_COMPILER) {
            result->op_type = IS_CONST;
            ZVAL_LONG(&result->u.constant, Z_LVAL_P(zend_ast_get_zval(last->child[0])));
            zend_string_release_ex(resolved_name, 0);
            return;
        }
    }
 
    if (zend_try_ct_eval_const(&result->u.constant, resolved_name, is_fully_qualified)) {
        result->op_type = IS_CONST;
        zend_string_release_ex(resolved_name, 0);
        return;
    }
 
    opline = zend_emit_op_tmp(result, ZEND_FETCH_CONSTANT, NULL, NULL);
    opline->op2_type = IS_CONST;
 
    if (is_fully_qualified || !FC(current_namespace)) {
        opline->op1.num = 0;
        opline->op2.constant = zend_add_const_name_literal(
            resolved_name, 0);
    } else {
        opline->op1.num = IS_CONSTANT_UNQUALIFIED_IN_NAMESPACE;
        opline->op2.constant = zend_add_const_name_literal(
            resolved_name, 1);
    }
    opline->extended_value = zend_alloc_cache_slot();
}
/* }}} */
 
static void zend_compile_class_const(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *class_ast;
    zend_ast *const_ast;
    znode class_node, const_node;
    zend_op *opline;
 
    zend_eval_const_expr(&ast->child[0]);
    zend_eval_const_expr(&ast->child[1]);
 
    class_ast = ast->child[0];
    const_ast = ast->child[1];
 
    if (class_ast->kind == ZEND_AST_ZVAL && const_ast->kind == ZEND_AST_ZVAL) {
        zval *const_zv = zend_ast_get_zval(const_ast);
        if (Z_TYPE_P(const_zv) == IS_STRING) {
            zend_string *const_str = Z_STR_P(const_zv);
            zend_string *resolved_name = zend_resolve_class_name_ast(class_ast);
            if (zend_try_ct_eval_class_const(&result->u.constant, resolved_name, const_str)) {
                result->op_type = IS_CONST;
                zend_string_release_ex(resolved_name, 0);
                return;
            }
            zend_string_release_ex(resolved_name, 0);
        }
    }
 
    zend_compile_class_ref(&class_node, class_ast, ZEND_FETCH_CLASS_EXCEPTION);
 
    zend_compile_expr(&const_node, const_ast);
 
    opline = zend_emit_op_tmp(result, ZEND_FETCH_CLASS_CONSTANT, NULL, &const_node);
 
    zend_set_class_name_op1(opline, &class_node);
 
    if (opline->op1_type == IS_CONST || opline->op2_type == IS_CONST) {
        opline->extended_value = zend_alloc_cache_slots(2);
    }
}
/* }}} */
 
static void zend_compile_class_name(znode *result, zend_ast *ast) /* {{{ */
{
    zend_ast *class_ast = ast->child[0];
 
    if (zend_try_compile_const_expr_resolve_class_name(&result->u.constant, class_ast)) {
        result->op_type = IS_CONST;
        return;
    }
 
    if (class_ast->kind == ZEND_AST_ZVAL) {
        zend_op *opline = zend_emit_op_tmp(result, ZEND_FETCH_CLASS_NAME, NULL, NULL);
        opline->op1.num = zend_get_class_fetch_type(zend_ast_get_str(class_ast));
    } else {
        znode expr_node;
        zend_compile_expr(&expr_node, class_ast);
        if (expr_node.op_type == IS_CONST) {
            /* Unlikely case that happen if class_ast is constant folded.
             * Handle it here, to avoid needing a CONST specialization in the VM. */
            zend_error_noreturn(E_COMPILE_ERROR, "Cannot use \"::class\" on %s",
                zend_zval_value_name(&expr_node.u.constant));
        }
 
        zend_emit_op_tmp(result, ZEND_FETCH_CLASS_NAME, &expr_node, NULL);
    }
}
/* }}} */
 
static zend_op *zend_compile_rope_add_ex(zend_op *opline, znode *result, uint32_t num, znode *elem_node) /* {{{ */
{
    if (num == 0) {
        result->op_type = IS_TMP_VAR;
        result->u.op.var = -1;
        opline->opcode = ZEND_ROPE_INIT;
    } else {
        opline->opcode = ZEND_ROPE_ADD;
        SET_NODE(opline->op1, result);
    }
    SET_NODE(opline->op2, elem_node);
    SET_NODE(opline->result, result);
    opline->extended_value = num;
    return opline;
}
/* }}} */
 
static zend_op *zend_compile_rope_add(znode *result, uint32_t num, znode *elem_node) /* {{{ */
{
    zend_op *opline = get_next_op();
 
    if (num == 0) {
        result->op_type = IS_TMP_VAR;
        result->u.op.var = -1;
        opline->opcode = ZEND_ROPE_INIT;
    } else {
        opline->opcode = ZEND_ROPE_ADD;
        SET_NODE(opline->op1, result);
    }
    SET_NODE(opline->op2, elem_node);
    SET_NODE(opline->result, result);
    opline->extended_value = num;
    return opline;
}
/* }}} */
 
static void zend_compile_rope_finalize(znode *result, uint32_t rope_elements, zend_op *init_opline, zend_op *opline)
{
    if (rope_elements == 1) {
        if (opline->op2_type == IS_CONST) {
            GET_NODE(result, opline->op2);
            ZVAL_UNDEF(CT_CONSTANT(opline->op2));
            SET_UNUSED(opline->op2);
            MAKE_NOP(opline);
        } else {
            opline->opcode = ZEND_CAST;
            opline->extended_value = IS_STRING;
            opline->op1_type = opline->op2_type;
            opline->op1 = opline->op2;
            SET_UNUSED(opline->op2);
            zend_make_tmp_result(result, opline);
        }
    } else if (rope_elements == 2) {
        opline->opcode = ZEND_FAST_CONCAT;
        opline->extended_value = 0;
        opline->op1_type = init_opline->op2_type;
        opline->op1 = init_opline->op2;
        zend_make_tmp_result(result, opline);
        MAKE_NOP(init_opline);
    } else {
        uint32_t var;
 
        init_opline->extended_value = rope_elements;
        opline->opcode = ZEND_ROPE_END;
        zend_make_tmp_result(result, opline);
        var = opline->op1.var = get_temporary_variable();
 
        /* Allocates the necessary number of zval slots to keep the rope */
        uint32_t i = ((rope_elements * sizeof(zend_string*)) + (sizeof(zval) - 1)) / sizeof(zval);
        while (i > 1) {
            get_temporary_variable();
            i--;
        }
 
        /* Update all the previous opcodes to use the same variable */
        while (opline != init_opline) {
            opline--;
            if (opline->opcode == ZEND_ROPE_ADD &&
                opline->result.var == (uint32_t)-1) {
                opline->op1.var = var;
                opline->result.var = var;
            } else if (opline->opcode == ZEND_ROPE_INIT &&
                       opline->result.var == (uint32_t)-1) {
                opline->result.var = var;
            }
        }
    }
}
 
static void zend_compile_encaps_list(znode *result, zend_ast *ast) /* {{{ */
{
    uint32_t i, j;
    uint32_t rope_init_lineno = -1;
    zend_op *opline = NULL, *init_opline;
    znode elem_node, last_const_node;
    zend_ast_list *list = zend_ast_get_list(ast);
    uint32_t reserved_op_number = -1;
 
    ZEND_ASSERT(list->children > 0);
 
    j = 0;
    last_const_node.op_type = IS_UNUSED;
    for (i = 0; i < list->children; i++) {
        zend_ast *encaps_var = list->child[i];
 
        if (encaps_var->attr & (ZEND_ENCAPS_VAR_DOLLAR_CURLY|ZEND_ENCAPS_VAR_DOLLAR_CURLY_VAR_VAR)) {
            if ((encaps_var->kind == ZEND_AST_VAR || encaps_var->kind == ZEND_AST_DIM) && (encaps_var->attr & ZEND_ENCAPS_VAR_DOLLAR_CURLY)) {
                zend_error(E_DEPRECATED, "Using ${var} in strings is deprecated, use {$var} instead");
            } else if (encaps_var->kind == ZEND_AST_VAR && (encaps_var->attr & ZEND_ENCAPS_VAR_DOLLAR_CURLY_VAR_VAR)) {
                zend_error(E_DEPRECATED, "Using ${expr} (variable variables) in strings is deprecated, use {${expr}} instead");
            }
        }
 
        zend_compile_expr(&elem_node, encaps_var);
 
        if (elem_node.op_type == IS_CONST) {
            convert_to_string(&elem_node.u.constant);
 
            if (Z_STRLEN(elem_node.u.constant) == 0) {
                zval_ptr_dtor(&elem_node.u.constant);
            } else if (last_const_node.op_type == IS_CONST) {
                concat_function(&last_const_node.u.constant, &last_const_node.u.constant, &elem_node.u.constant);
                zval_ptr_dtor(&elem_node.u.constant);
            } else {
                last_const_node.op_type = IS_CONST;
                ZVAL_COPY_VALUE(&last_const_node.u.constant, &elem_node.u.constant);
                /* Reserve place for ZEND_ROPE_ADD instruction */
                reserved_op_number = get_next_op_number();
                opline = get_next_op();
                opline->opcode = ZEND_NOP;
            }
            continue;
        } else {
            if (j == 0) {
                if (last_const_node.op_type == IS_CONST) {
                    rope_init_lineno = reserved_op_number;
                } else {
                    rope_init_lineno = get_next_op_number();
                }
            }
            if (last_const_node.op_type == IS_CONST) {
                opline = &CG(active_op_array)->opcodes[reserved_op_number];
                zend_compile_rope_add_ex(opline, result, j++, &last_const_node);
                last_const_node.op_type = IS_UNUSED;
            }
            opline = zend_compile_rope_add(result, j++, &elem_node);
        }
    }
 
    if (j == 0) {
        result->op_type = IS_CONST;
        if (last_const_node.op_type == IS_CONST) {
            ZVAL_COPY_VALUE(&result->u.constant, &last_const_node.u.constant);
        } else {
            ZVAL_EMPTY_STRING(&result->u.constant);
            /* empty string */
        }
        CG(active_op_array)->last = reserved_op_number - 1;
        return;
    } else if (last_const_node.op_type == IS_CONST) {
        opline = &CG(active_op_array)->opcodes[reserved_op_number];
        opline = zend_compile_rope_add_ex(opline, result, j++, &last_const_node);
    }
    init_opline = CG(active_op_array)->opcodes + rope_init_lineno;
    zend_compile_rope_finalize(result, j, init_opline, opline);
}
/* }}} */
 
static void zend_compile_magic_const(znode *result, zend_ast *ast) /* {{{ */
{
    zend_op *opline;
 
    if (zend_try_ct_eval_magic_const(&result->u.constant, ast)) {
        result->op_type = IS_CONST;
        return;
    }
 
    ZEND_ASSERT(ast->attr == T_CLASS_C &&
                CG(active_class_entry) &&
                (CG(active_class_entry)->ce_flags & ZEND_ACC_TRAIT) != 0);
 
    opline = zend_emit_op_tmp(result, ZEND_FETCH_CLASS_NAME, NULL, NULL);
    opline->op1.num = ZEND_FETCH_CLASS_SELF;
}
/* }}} */
 
static bool zend_is_allowed_in_const_expr(zend_ast_kind kind) /* {{{ */
{
    return kind == ZEND_AST_ZVAL || kind == ZEND_AST_BINARY_OP
        || kind == ZEND_AST_GREATER || kind == ZEND_AST_GREATER_EQUAL
        || kind == ZEND_AST_AND || kind == ZEND_AST_OR
        || kind == ZEND_AST_UNARY_OP
        || kind == ZEND_AST_UNARY_PLUS || kind == ZEND_AST_UNARY_MINUS
        || kind == ZEND_AST_CONDITIONAL || kind == ZEND_AST_DIM
        || kind == ZEND_AST_ARRAY || kind == ZEND_AST_ARRAY_ELEM
        || kind == ZEND_AST_UNPACK
        || kind == ZEND_AST_CONST || kind == ZEND_AST_CLASS_CONST
        || kind == ZEND_AST_CLASS_NAME
        || kind == ZEND_AST_MAGIC_CONST || kind == ZEND_AST_COALESCE
        || kind == ZEND_AST_CONST_ENUM_INIT
        || kind == ZEND_AST_NEW || kind == ZEND_AST_ARG_LIST
        || kind == ZEND_AST_NAMED_ARG
        || kind == ZEND_AST_PROP || kind == ZEND_AST_NULLSAFE_PROP;
}
/* }}} */
 
static void zend_compile_const_expr_class_const(zend_ast **ast_ptr) /* {{{ */
{
    zend_ast *ast = *ast_ptr;
    zend_ast *class_ast = ast->child[0];
    zend_string *class_name;
    int fetch_type;
 
    if (class_ast->kind != ZEND_AST_ZVAL) {
        zend_error_noreturn(E_COMPILE_ERROR,
            "Dynamic class names are not allowed in compile-time class constant references");
    }
    if (Z_TYPE_P(zend_ast_get_zval(class_ast)) != IS_STRING) {
        zend_throw_error(NULL, "Class name must be a valid object or a string");
    }
 
    class_name = zend_ast_get_str(class_ast);
    fetch_type = zend_get_class_fetch_type(class_name);
 
    if (ZEND_FETCH_CLASS_STATIC == fetch_type) {
        zend_error_noreturn(E_COMPILE_ERROR,
            "\"static::\" is not allowed in compile-time constants");
    }
 
    if (ZEND_FETCH_CLASS_DEFAULT == fetch_type) {
        zend_string *tmp = zend_resolve_class_name_ast(class_ast);
 
        zend_string_release_ex(class_name, 0);
        if (tmp != class_name) {
            zval *zv = zend_ast_get_zval(class_ast);
            ZVAL_STR(zv, tmp);
            class_ast->attr = ZEND_NAME_FQ;
        }
    }
 
    ast->attr |= ZEND_FETCH_CLASS_EXCEPTION;
}
/* }}} */
 
static void zend_compile_const_expr_class_name(zend_ast **ast_ptr) /* {{{ */
{
    zend_ast *ast = *ast_ptr;
    zend_ast *class_ast = ast->child[0];
    if (class_ast->kind != ZEND_AST_ZVAL) {
        zend_error_noreturn(E_COMPILE_ERROR,
            "(expression)::class cannot be used in constant expressions");
    }
 
    zend_string *class_name = zend_ast_get_str(class_ast);
    uint32_t fetch_type = zend_get_class_fetch_type(class_name);
 
    switch (fetch_type) {
        case ZEND_FETCH_CLASS_SELF:
        case ZEND_FETCH_CLASS_PARENT:
            /* For the const-eval representation store the fetch type instead of the name. */
            zend_string_release(class_name);
            ast->child[0] = NULL;
            ast->attr = fetch_type;
            return;
        case ZEND_FETCH_CLASS_STATIC:
            zend_error_noreturn(E_COMPILE_ERROR,
                "static::class cannot be used for compile-time class name resolution");
            return;
        EMPTY_SWITCH_DEFAULT_CASE()
    }
}
 
static void zend_compile_const_expr_const(zend_ast **ast_ptr) /* {{{ */
{
    zend_ast *ast = *ast_ptr;
    zend_ast *name_ast = ast->child[0];
    zend_string *orig_name = zend_ast_get_str(name_ast);
    bool is_fully_qualified;
    zval result;
    zend_string *resolved_name;
 
    CG(zend_lineno) = zend_ast_get_lineno(ast);
 
    resolved_name = zend_resolve_const_name(
        orig_name, name_ast->attr, &is_fully_qualified);
 
    if (zend_try_ct_eval_const(&result, resolved_name, is_fully_qualified)) {
        zend_string_release_ex(resolved_name, 0);
        zend_ast_destroy(ast);
        *ast_ptr = zend_ast_create_zval(&result);
        return;
    }
 
    zend_ast_destroy(ast);
    *ast_ptr = zend_ast_create_constant(resolved_name,
        !is_fully_qualified && FC(current_namespace) ? IS_CONSTANT_UNQUALIFIED_IN_NAMESPACE : 0);
}
/* }}} */
 
static void zend_compile_const_expr_magic_const(zend_ast **ast_ptr) /* {{{ */
{
    zend_ast *ast = *ast_ptr;
 
    /* Other cases already resolved by constant folding */
    ZEND_ASSERT(ast->attr == T_CLASS_C);
 
    zend_ast_destroy(ast);
    *ast_ptr = zend_ast_create(ZEND_AST_CONSTANT_CLASS);
}
/* }}} */
 
static void zend_compile_const_expr_new(zend_ast **ast_ptr)
{
    zend_ast *class_ast = (*ast_ptr)->child[0];
    if (class_ast->kind == ZEND_AST_CLASS) {
        zend_error_noreturn(E_COMPILE_ERROR,
            "Cannot use anonymous class in constant expression");
    }
    if (class_ast->kind != ZEND_AST_ZVAL) {
        zend_error_noreturn(E_COMPILE_ERROR,
            "Cannot use dynamic class name in constant expression");
    }
 
    zend_string *class_name = zend_resolve_class_name_ast(class_ast);
    int fetch_type = zend_get_class_fetch_type(class_name);
    if (ZEND_FETCH_CLASS_STATIC == fetch_type) {
        zend_error_noreturn(E_COMPILE_ERROR,
            "\"static\" is not allowed in compile-time constants");
    }
 
    zval *class_ast_zv = zend_ast_get_zval(class_ast);
    zval_ptr_dtor_nogc(class_ast_zv);
    ZVAL_STR(class_ast_zv, class_name);
    class_ast->attr = fetch_type << ZEND_CONST_EXPR_NEW_FETCH_TYPE_SHIFT;
}
 
static void zend_compile_const_expr_args(zend_ast **ast_ptr)
{
    zend_ast_list *list = zend_ast_get_list(*ast_ptr);
    bool uses_named_args = false;
    for (uint32_t i = 0; i < list->children; i++) {
        zend_ast *arg = list->child[i];
        if (arg->kind == ZEND_AST_UNPACK) {
            zend_error_noreturn(E_COMPILE_ERROR,
                "Argument unpacking in constant expressions is not supported");
        }
        if (arg->kind == ZEND_AST_NAMED_ARG) {
            uses_named_args = true;
        } else if (uses_named_args) {
            zend_error_noreturn(E_COMPILE_ERROR,
                "Cannot use positional argument after named argument");
        }
    }
    if (uses_named_args) {
        list->attr = 1;
    }
}
 
typedef struct {
    /* Whether the value of this expression may differ on each evaluation. */
    bool allow_dynamic;
} const_expr_context;
 
static void zend_compile_const_expr(zend_ast **ast_ptr, void *context) /* {{{ */
{
    const_expr_context *ctx = (const_expr_context *) context;
    zend_ast *ast = *ast_ptr;
    if (ast == NULL || ast->kind == ZEND_AST_ZVAL) {
        return;
    }
 
    if (!zend_is_allowed_in_const_expr(ast->kind)) {
        zend_error_noreturn(E_COMPILE_ERROR, "Constant expression contains invalid operations");
    }
 
    switch (ast->kind) {
        case ZEND_AST_CLASS_CONST:
            zend_compile_const_expr_class_const(ast_ptr);
            break;
        case ZEND_AST_CLASS_NAME:
            zend_compile_const_expr_class_name(ast_ptr);
            break;
        case ZEND_AST_CONST:
            zend_compile_const_expr_const(ast_ptr);
            break;
        case ZEND_AST_MAGIC_CONST:
            zend_compile_const_expr_magic_const(ast_ptr);
            break;
        case ZEND_AST_NEW:
            if (!ctx->allow_dynamic) {
                zend_error_noreturn(E_COMPILE_ERROR,
                    "New expressions are not supported in this context");
            }
            zend_compile_const_expr_new(ast_ptr);
            break;
        case ZEND_AST_ARG_LIST:
            zend_compile_const_expr_args(ast_ptr);
            break;
    }
 
    zend_ast_apply(ast, zend_compile_const_expr, context);
}
/* }}} */
 
void zend_const_expr_to_zval(zval *result, zend_ast **ast_ptr, bool allow_dynamic) /* {{{ */
{
    const_expr_context context;
    context.allow_dynamic = allow_dynamic;
 
    zend_eval_const_expr(ast_ptr);
    zend_compile_const_expr(ast_ptr, &context);
    if ((*ast_ptr)->kind != ZEND_AST_ZVAL) {
        /* Replace with compiled AST zval representation. */
        zval ast_zv;
        ZVAL_AST(&ast_zv, zend_ast_copy(*ast_ptr));
        zend_ast_destroy(*ast_ptr);
        *ast_ptr = zend_ast_create_zval(&ast_zv);
    }
    ZVAL_COPY(result, zend_ast_get_zval(*ast_ptr));
}
/* }}} */
 
/* Same as compile_stmt, but with early binding */
void zend_compile_top_stmt(zend_ast *ast) /* {{{ */
{
    if (!ast) {
        return;
    }
 
    if (ast->kind == ZEND_AST_STMT_LIST) {
        zend_ast_list *list = zend_ast_get_list(ast);
        uint32_t i;
        for (i = 0; i < list->children; ++i) {
            zend_compile_top_stmt(list->child[i]);
        }
        return;
    }
 
    if (ast->kind == ZEND_AST_FUNC_DECL) {
        CG(zend_lineno) = ast->lineno;
        zend_compile_func_decl(NULL, ast, 1);
        CG(zend_lineno) = ((zend_ast_decl *) ast)->end_lineno;
    } else if (ast->kind == ZEND_AST_CLASS) {
        CG(zend_lineno) = ast->lineno;
        zend_compile_class_decl(NULL, ast, 1);
        CG(zend_lineno) = ((zend_ast_decl *) ast)->end_lineno;
    } else {
        zend_compile_stmt(ast);
    }
    if (ast->kind != ZEND_AST_NAMESPACE && ast->kind != ZEND_AST_HALT_COMPILER) {
        zend_verify_namespace();
    }
}
/* }}} */
 
static void zend_compile_stmt(zend_ast *ast) /* {{{ */
{
    if (!ast) {
        return;
    }
 
    CG(zend_lineno) = ast->lineno;
 
    if ((CG(compiler_options) & ZEND_COMPILE_EXTENDED_STMT) && !zend_is_unticked_stmt(ast)) {
        zend_do_extended_stmt();
    }
 
    switch (ast->kind) {
        case ZEND_AST_STMT_LIST:
            zend_compile_stmt_list(ast);
            break;
        case ZEND_AST_GLOBAL:
            zend_compile_global_var(ast);
            break;
        case ZEND_AST_STATIC:
            zend_compile_static_var(ast);
            break;
        case ZEND_AST_UNSET:
            zend_compile_unset(ast);
            break;
        case ZEND_AST_RETURN:
            zend_compile_return(ast);
            break;
        case ZEND_AST_ECHO:
            zend_compile_echo(ast);
            break;
        case ZEND_AST_BREAK:
        case ZEND_AST_CONTINUE:
            zend_compile_break_continue(ast);
            break;
        case ZEND_AST_GOTO:
            zend_compile_goto(ast);
            break;
        case ZEND_AST_LABEL:
            zend_compile_label(ast);
            break;
        case ZEND_AST_WHILE:
            zend_compile_while(ast);
            break;
        case ZEND_AST_DO_WHILE:
            zend_compile_do_while(ast);
            break;
        case ZEND_AST_FOR:
            zend_compile_for(ast);
            break;
        case ZEND_AST_FOREACH:
            zend_compile_foreach(ast);
            break;
        case ZEND_AST_IF:
            zend_compile_if(ast);
            break;
        case ZEND_AST_SWITCH:
            zend_compile_switch(ast);
            break;
        case ZEND_AST_TRY:
            zend_compile_try(ast);
            break;
        case ZEND_AST_DECLARE:
            zend_compile_declare(ast);
            break;
        case ZEND_AST_FUNC_DECL:
        case ZEND_AST_METHOD:
            zend_compile_func_decl(NULL, ast, 0);
            break;
        case ZEND_AST_ENUM_CASE:
            zend_compile_enum_case(ast);
            break;
        case ZEND_AST_PROP_GROUP:
            zend_compile_prop_group(ast);
            break;
        case ZEND_AST_CLASS_CONST_GROUP:
            zend_compile_class_const_group(ast);
            break;
        case ZEND_AST_USE_TRAIT:
            zend_compile_use_trait(ast);
            break;
        case ZEND_AST_CLASS:
            zend_compile_class_decl(NULL, ast, 0);
            break;
        case ZEND_AST_GROUP_USE:
            zend_compile_group_use(ast);
            break;
        case ZEND_AST_USE:
            zend_compile_use(ast);
            break;
        case ZEND_AST_CONST_DECL:
            zend_compile_const_decl(ast);
            break;
        case ZEND_AST_NAMESPACE:
            zend_compile_namespace(ast);
            break;
        case ZEND_AST_HALT_COMPILER:
            zend_compile_halt_compiler(ast);
            break;
        case ZEND_AST_THROW:
            zend_compile_expr(NULL, ast);
            break;
        default:
        {
            znode result;
            zend_compile_expr(&result, ast);
            zend_do_free(&result);
        }
    }
 
    if (FC(declarables).ticks && !zend_is_unticked_stmt(ast)) {
        zend_emit_tick();
    }
}
/* }}} */
 
static void zend_compile_expr_inner(znode *result, zend_ast *ast) /* {{{ */
{
    /* CG(zend_lineno) = ast->lineno; */
    CG(zend_lineno) = zend_ast_get_lineno(ast);
 
    if (CG(memoize_mode) != ZEND_MEMOIZE_NONE) {
        zend_compile_memoized_expr(result, ast);
        return;
    }
 
    switch (ast->kind) {
        case ZEND_AST_ZVAL:
            ZVAL_COPY(&result->u.constant, zend_ast_get_zval(ast));
            result->op_type = IS_CONST;
            return;
        case ZEND_AST_ZNODE:
            *result = *zend_ast_get_znode(ast);
            return;
        case ZEND_AST_VAR:
        case ZEND_AST_DIM:
        case ZEND_AST_PROP:
        case ZEND_AST_NULLSAFE_PROP:
        case ZEND_AST_STATIC_PROP:
        case ZEND_AST_CALL:
        case ZEND_AST_METHOD_CALL:
        case ZEND_AST_NULLSAFE_METHOD_CALL:
        case ZEND_AST_STATIC_CALL:
        case ZEND_AST_PARENT_PROPERTY_HOOK_CALL:
            zend_compile_var(result, ast, BP_VAR_R, 0);
            return;
        case ZEND_AST_ASSIGN:
            zend_compile_assign(result, ast);
            return;
        case ZEND_AST_ASSIGN_REF:
            zend_compile_assign_ref(result, ast);
            return;
        case ZEND_AST_NEW:
            zend_compile_new(result, ast);
            return;
        case ZEND_AST_CLONE:
            zend_compile_clone(result, ast);
            return;
        case ZEND_AST_ASSIGN_OP:
            zend_compile_compound_assign(result, ast);
            return;
        case ZEND_AST_BINARY_OP:
            zend_compile_binary_op(result, ast);
            return;
        case ZEND_AST_GREATER:
        case ZEND_AST_GREATER_EQUAL:
            zend_compile_greater(result, ast);
            return;
        case ZEND_AST_UNARY_OP:
            zend_compile_unary_op(result, ast);
            return;
        case ZEND_AST_UNARY_PLUS:
        case ZEND_AST_UNARY_MINUS:
            zend_compile_unary_pm(result, ast);
            return;
        case ZEND_AST_AND:
        case ZEND_AST_OR:
            zend_compile_short_circuiting(result, ast);
            return;
        case ZEND_AST_POST_INC:
        case ZEND_AST_POST_DEC:
            zend_compile_post_incdec(result, ast);
            return;
        case ZEND_AST_PRE_INC:
        case ZEND_AST_PRE_DEC:
            zend_compile_pre_incdec(result, ast);
            return;
        case ZEND_AST_CAST:
            zend_compile_cast(result, ast);
            return;
        case ZEND_AST_CONDITIONAL:
            zend_compile_conditional(result, ast);
            return;
        case ZEND_AST_COALESCE:
            zend_compile_coalesce(result, ast);
            return;
        case ZEND_AST_ASSIGN_COALESCE:
            zend_compile_assign_coalesce(result, ast);
            return;
        case ZEND_AST_PRINT:
            zend_compile_print(result, ast);
            return;
        case ZEND_AST_YIELD:
            zend_compile_yield(result, ast);
            return;
        case ZEND_AST_YIELD_FROM:
            zend_compile_yield_from(result, ast);
            return;
        case ZEND_AST_INSTANCEOF:
            zend_compile_instanceof(result, ast);
            return;
        case ZEND_AST_INCLUDE_OR_EVAL:
            zend_compile_include_or_eval(result, ast);
            return;
        case ZEND_AST_ISSET:
        case ZEND_AST_EMPTY:
            zend_compile_isset_or_empty(result, ast);
            return;
        case ZEND_AST_SILENCE:
            zend_compile_silence(result, ast);
            return;
        case ZEND_AST_SHELL_EXEC:
            zend_compile_shell_exec(result, ast);
            return;
        case ZEND_AST_ARRAY:
            zend_compile_array(result, ast);
            return;
        case ZEND_AST_CONST:
            zend_compile_const(result, ast);
            return;
        case ZEND_AST_CLASS_CONST:
            zend_compile_class_const(result, ast);
            return;
        case ZEND_AST_CLASS_NAME:
            zend_compile_class_name(result, ast);
            return;
        case ZEND_AST_ENCAPS_LIST:
            zend_compile_encaps_list(result, ast);
            return;
        case ZEND_AST_MAGIC_CONST:
            zend_compile_magic_const(result, ast);
            return;
        case ZEND_AST_CLOSURE:
        case ZEND_AST_ARROW_FUNC:
            zend_compile_func_decl(result, ast, 0);
            return;
        case ZEND_AST_THROW:
            zend_compile_throw(result, ast);
            return;
        case ZEND_AST_MATCH:
            zend_compile_match(result, ast);
            return;
        default:
            ZEND_ASSERT(0 /* not supported */);
    }
}
/* }}} */
 
static void zend_compile_expr(znode *result, zend_ast *ast)
{
    zend_check_stack_limit();
 
    uint32_t checkpoint = zend_short_circuiting_checkpoint();
    zend_compile_expr_inner(result, ast);
    zend_short_circuiting_commit(checkpoint, result, ast);
}
 
static zend_op *zend_compile_var_inner(znode *result, zend_ast *ast, uint32_t type, bool by_ref)
{
    CG(zend_lineno) = zend_ast_get_lineno(ast);
 
    if (CG(memoize_mode) != ZEND_MEMOIZE_NONE) {
        switch (ast->kind) {
            case ZEND_AST_CALL:
            case ZEND_AST_METHOD_CALL:
            case ZEND_AST_NULLSAFE_METHOD_CALL:
            case ZEND_AST_STATIC_CALL:
                zend_compile_memoized_expr(result, ast);
                /* This might not actually produce an opcode, e.g. for expressions evaluated at comptime. */
                return NULL;
        }
    }
 
    switch (ast->kind) {
        case ZEND_AST_VAR:
            return zend_compile_simple_var(result, ast, type, 0);
        case ZEND_AST_DIM:
            return zend_compile_dim(result, ast, type, by_ref);
        case ZEND_AST_PROP:
        case ZEND_AST_NULLSAFE_PROP:
            return zend_compile_prop(result, ast, type, by_ref);
        case ZEND_AST_STATIC_PROP:
            return zend_compile_static_prop(result, ast, type, by_ref, 0);
        case ZEND_AST_CALL:
            zend_compile_call(result, ast, type);
            return NULL;
        case ZEND_AST_PARENT_PROPERTY_HOOK_CALL:
            zend_compile_parent_property_hook_call(result, ast, type);
            return NULL;
        case ZEND_AST_METHOD_CALL:
        case ZEND_AST_NULLSAFE_METHOD_CALL:
            zend_compile_method_call(result, ast, type);
            return NULL;
        case ZEND_AST_STATIC_CALL:
            zend_compile_static_call(result, ast, type);
            return NULL;
        case ZEND_AST_ZNODE:
            *result = *zend_ast_get_znode(ast);
            return NULL;
        default:
            if (type == BP_VAR_W || type == BP_VAR_RW || type == BP_VAR_UNSET) {
                zend_error_noreturn(E_COMPILE_ERROR,
                    "Cannot use temporary expression in write context");
            }
 
            zend_compile_expr(result, ast);
            return NULL;
    }
}
 
static zend_op *zend_compile_var(znode *result, zend_ast *ast, uint32_t type, bool by_ref) /* {{{ */
{
    zend_check_stack_limit();
 
    uint32_t checkpoint = zend_short_circuiting_checkpoint();
    zend_op *opcode = zend_compile_var_inner(result, ast, type, by_ref);
    zend_short_circuiting_commit(checkpoint, result, ast);
    return opcode;
}
 
static zend_op *zend_delayed_compile_var(znode *result, zend_ast *ast, uint32_t type, bool by_ref) /* {{{ */
{
    zend_check_stack_limit();
 
    switch (ast->kind) {
        case ZEND_AST_VAR:
            return zend_compile_simple_var(result, ast, type, 1);
        case ZEND_AST_DIM:
            return zend_delayed_compile_dim(result, ast, type, by_ref);
        case ZEND_AST_PROP:
        case ZEND_AST_NULLSAFE_PROP:
        {
            zend_op *opline = zend_delayed_compile_prop(result, ast, type);
            if (by_ref) {
                opline->extended_value |= ZEND_FETCH_REF;
            }
            return opline;
        }
        case ZEND_AST_STATIC_PROP:
            return zend_compile_static_prop(result, ast, type, by_ref, 1);
        default:
            return zend_compile_var(result, ast, type, 0);
    }
}
/* }}} */
 
static void zend_eval_const_expr(zend_ast **ast_ptr) /* {{{ */
{
    zend_ast *ast = *ast_ptr;
    zval result;
 
    if (!ast) {
        return;
    }
 
    zend_check_stack_limit();
 
    switch (ast->kind) {
        case ZEND_AST_BINARY_OP:
            zend_eval_const_expr(&ast->child[0]);
            zend_eval_const_expr(&ast->child[1]);
            if (ast->child[0]->kind != ZEND_AST_ZVAL || ast->child[1]->kind != ZEND_AST_ZVAL) {
                return;
            }
 
            if (!zend_try_ct_eval_binary_op(&result, ast->attr,
                    zend_ast_get_zval(ast->child[0]), zend_ast_get_zval(ast->child[1]))
            ) {
                return;
            }
            break;
        case ZEND_AST_GREATER:
        case ZEND_AST_GREATER_EQUAL:
            zend_eval_const_expr(&ast->child[0]);
            zend_eval_const_expr(&ast->child[1]);
            if (ast->child[0]->kind != ZEND_AST_ZVAL || ast->child[1]->kind != ZEND_AST_ZVAL) {
                return;
            }
 
            zend_ct_eval_greater(&result, ast->kind,
                zend_ast_get_zval(ast->child[0]), zend_ast_get_zval(ast->child[1]));
            break;
        case ZEND_AST_AND:
        case ZEND_AST_OR:
        {
            bool child0_is_true, child1_is_true;
            zend_eval_const_expr(&ast->child[0]);
            zend_eval_const_expr(&ast->child[1]);
            if (ast->child[0]->kind != ZEND_AST_ZVAL) {
                return;
            }
 
            child0_is_true = zend_is_true(zend_ast_get_zval(ast->child[0]));
            if (child0_is_true == (ast->kind == ZEND_AST_OR)) {
                ZVAL_BOOL(&result, ast->kind == ZEND_AST_OR);
                break;
            }
 
            if (ast->child[1]->kind != ZEND_AST_ZVAL) {
                return;
            }
 
            child1_is_true = zend_is_true(zend_ast_get_zval(ast->child[1]));
            if (ast->kind == ZEND_AST_OR) {
                ZVAL_BOOL(&result, child0_is_true || child1_is_true);
            } else {
                ZVAL_BOOL(&result, child0_is_true && child1_is_true);
            }
            break;
        }
        case ZEND_AST_UNARY_OP:
            zend_eval_const_expr(&ast->child[0]);
            if (ast->child[0]->kind != ZEND_AST_ZVAL) {
                return;
            }
 
            if (!zend_try_ct_eval_unary_op(&result, ast->attr, zend_ast_get_zval(ast->child[0]))) {
                return;
            }
            break;
        case ZEND_AST_UNARY_PLUS:
        case ZEND_AST_UNARY_MINUS:
            zend_eval_const_expr(&ast->child[0]);
            if (ast->child[0]->kind != ZEND_AST_ZVAL) {
                return;
            }
 
            if (!zend_try_ct_eval_unary_pm(&result, ast->kind, zend_ast_get_zval(ast->child[0]))) {
                return;
            }
            break;
        case ZEND_AST_COALESCE:
            /* Set isset fetch indicator here, opcache disallows runtime altering of the AST */
            if (ast->child[0]->kind == ZEND_AST_DIM) {
                ast->child[0]->attr |= ZEND_DIM_IS;
            }
            zend_eval_const_expr(&ast->child[0]);
 
            if (ast->child[0]->kind != ZEND_AST_ZVAL) {
                /* ensure everything was compile-time evaluated at least once */
                zend_eval_const_expr(&ast->child[1]);
                return;
            }
 
            if (Z_TYPE_P(zend_ast_get_zval(ast->child[0])) == IS_NULL) {
                zend_eval_const_expr(&ast->child[1]);
                *ast_ptr = ast->child[1];
                ast->child[1] = NULL;
                zend_ast_destroy(ast);
            } else {
                *ast_ptr = ast->child[0];
                ast->child[0] = NULL;
                zend_ast_destroy(ast);
            }
            return;
        case ZEND_AST_CONDITIONAL:
        {
            zend_ast **child, *child_ast;
            zend_eval_const_expr(&ast->child[0]);
            if (ast->child[0]->kind != ZEND_AST_ZVAL) {
                /* ensure everything was compile-time evaluated at least once */
                if (ast->child[1]) {
                    zend_eval_const_expr(&ast->child[1]);
                }
                zend_eval_const_expr(&ast->child[2]);
                return;
            }
 
            child = &ast->child[2 - zend_is_true(zend_ast_get_zval(ast->child[0]))];
            if (*child == NULL) {
                child--;
            }
            child_ast = *child;
            *child = NULL;
            zend_ast_destroy(ast);
            *ast_ptr = child_ast;
            zend_eval_const_expr(ast_ptr);
            return;
        }
        case ZEND_AST_DIM:
        {
            /* constant expression should be always read context ... */
            zval *container, *dim;
 
            if (ast->child[1] == NULL) {
                zend_error_noreturn(E_COMPILE_ERROR, "Cannot use [] for reading");
            }
 
            /* Set isset fetch indicator here, opcache disallows runtime altering of the AST */
            if ((ast->attr & ZEND_DIM_IS) && ast->child[0]->kind == ZEND_AST_DIM) {
                ast->child[0]->attr |= ZEND_DIM_IS;
            }
 
            zend_eval_const_expr(&ast->child[0]);
            zend_eval_const_expr(&ast->child[1]);
            if (ast->child[0]->kind != ZEND_AST_ZVAL || ast->child[1]->kind != ZEND_AST_ZVAL) {
                return;
            }
 
            container = zend_ast_get_zval(ast->child[0]);
            dim = zend_ast_get_zval(ast->child[1]);
 
            if (Z_TYPE_P(container) == IS_ARRAY) {
                zval *el;
                if (Z_TYPE_P(dim) == IS_LONG) {
                    el = zend_hash_index_find(Z_ARR_P(container), Z_LVAL_P(dim));
                    if (el) {
                        ZVAL_COPY(&result, el);
                    } else {
                        return;
                    }
                } else if (Z_TYPE_P(dim) == IS_STRING) {
                    el = zend_symtable_find(Z_ARR_P(container), Z_STR_P(dim));
                    if (el) {
                        ZVAL_COPY(&result, el);
                    } else {
                        return;
                    }
                } else {
                    return; /* warning... handle at runtime */
                }
            } else if (Z_TYPE_P(container) == IS_STRING) {
                zend_long offset;
                uint8_t c;
                if (Z_TYPE_P(dim) == IS_LONG) {
                    offset = Z_LVAL_P(dim);
                } else if (Z_TYPE_P(dim) != IS_STRING || is_numeric_string(Z_STRVAL_P(dim), Z_STRLEN_P(dim), &offset, NULL, 1) != IS_LONG) {
                    return;
                }
                if (offset < 0 || (size_t)offset >= Z_STRLEN_P(container)) {
                    return;
                }
                c = (uint8_t) Z_STRVAL_P(container)[offset];
                ZVAL_CHAR(&result, c);
            } else if (Z_TYPE_P(container) <= IS_FALSE) {
                return; /* warning... handle at runtime */
            } else {
                return;
            }
            break;
        }
        case ZEND_AST_ARRAY:
            if (!zend_try_ct_eval_array(&result, ast)) {
                return;
            }
            break;
        case ZEND_AST_MAGIC_CONST:
            if (!zend_try_ct_eval_magic_const(&result, ast)) {
                return;
            }
            break;
        case ZEND_AST_CONST:
        {
            zend_ast *name_ast = ast->child[0];
            bool is_fully_qualified;
            zend_string *resolved_name = zend_resolve_const_name(
                zend_ast_get_str(name_ast), name_ast->attr, &is_fully_qualified);
 
            if (!zend_try_ct_eval_const(&result, resolved_name, is_fully_qualified)) {
                zend_string_release_ex(resolved_name, 0);
                return;
            }
 
            zend_string_release_ex(resolved_name, 0);
            break;
        }
        case ZEND_AST_CLASS_CONST:
        {
            zend_ast *class_ast;
            zend_ast *name_ast;
            zend_string *resolved_name;
 
            zend_eval_const_expr(&ast->child[0]);
            zend_eval_const_expr(&ast->child[1]);
 
            if (UNEXPECTED(ast->child[1]->kind != ZEND_AST_ZVAL
                || Z_TYPE_P(zend_ast_get_zval(ast->child[1])) != IS_STRING)) {
                return;
            }
 
            class_ast = ast->child[0];
            name_ast = ast->child[1];
 
            if (class_ast->kind != ZEND_AST_ZVAL || name_ast->kind != ZEND_AST_ZVAL) {
                return;
            }
 
            resolved_name = zend_resolve_class_name_ast(class_ast);
            if (!zend_try_ct_eval_class_const(&result, resolved_name, zend_ast_get_str(name_ast))) {
                zend_string_release_ex(resolved_name, 0);
                return;
            }
 
            zend_string_release_ex(resolved_name, 0);
            break;
        }
        case ZEND_AST_CLASS_NAME:
        {
            zend_ast *class_ast = ast->child[0];
            if (!zend_try_compile_const_expr_resolve_class_name(&result, class_ast)) {
                return;
            }
            break;
        }
        // TODO: We should probably use zend_ast_apply to recursively walk nodes without
        // special handling. It is required that all nodes that are part of a const expr
        // are visited. Probably we should be distinguishing evaluation of const expr and
        // normal exprs here.
        case ZEND_AST_ARG_LIST:
        {
            zend_ast_list *list = zend_ast_get_list(ast);
            for (uint32_t i = 0; i < list->children; i++) {
                zend_eval_const_expr(&list->child[i]);
            }
            return;
        }
        case ZEND_AST_NEW:
            zend_eval_const_expr(&ast->child[0]);
            zend_eval_const_expr(&ast->child[1]);
            return;
        case ZEND_AST_NAMED_ARG:
            zend_eval_const_expr(&ast->child[1]);
            return;
        case ZEND_AST_CONST_ENUM_INIT:
            zend_eval_const_expr(&ast->child[2]);
            return;
        case ZEND_AST_PROP:
        case ZEND_AST_NULLSAFE_PROP:
            zend_eval_const_expr(&ast->child[0]);
            zend_eval_const_expr(&ast->child[1]);
            return;
        default:
            return;
    }
 
    zend_ast_destroy(ast);
    *ast_ptr = zend_ast_create_zval(&result);
}
/* }}} */