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sljitExecAllocatorPosix.c
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1/*
2 * Stack-less Just-In-Time compiler
3 *
4 * Copyright Zoltan Herczeg (hzmester@freemail.hu). All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without modification, are
7 * permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright notice, this list of
10 * conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright notice, this list
13 * of conditions and the following disclaimer in the documentation and/or other materials
14 * provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY
17 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
19 * SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
21 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
22 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
23 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
24 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27#include <sys/types.h>
28#include <sys/mman.h>
29
30static SLJIT_INLINE void* alloc_chunk(sljit_uw size)
31{
32 void *retval;
33 int prot = PROT_READ | PROT_WRITE | PROT_EXEC;
34 int flags = MAP_PRIVATE;
35 int fd = -1;
36
37#ifdef PROT_MAX
38 prot |= PROT_MAX(prot);
39#endif
40
41#ifdef MAP_ANON
42 flags |= MAP_ANON;
43#else /* !MAP_ANON */
44 if (SLJIT_UNLIKELY((dev_zero < 0) && open_dev_zero()))
45 return NULL;
46
47 fd = dev_zero;
48#endif /* MAP_ANON */
49
50 retval = mmap(NULL, size, prot, flags, fd, 0);
51 if (retval == MAP_FAILED)
52 return NULL;
53
54 return retval;
55}
56
57static SLJIT_INLINE void free_chunk(void *chunk, sljit_uw size)
58{
59 munmap(chunk, size);
60}
61
new_type size
Definition ffi.c:4365
#define NULL
Definition gdcache.h:45
int fd
Definition phpdbg.h:282
#define PROT_READ
Definition phpdbg_win.h:26
#define PROT_WRITE
Definition phpdbg_win.h:27
#define SLJIT_UNLIKELY(x)
unsigned int sljit_uw
#define SLJIT_INLINE
#define MAP_FAILED
Definition zend_alloc.c:98
zval retval