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/*
* Stack-less Just-In-Time compiler
*
* Copyright 2009-2012 Zoltan Herczeg (hzmester@freemail.hu). All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification, are
* permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this list of
* conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice, this list
* of conditions and the following disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) AND CONTRIBUTORS ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
* SHALL THE COPYRIGHT HOLDER(S) OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
This file contains a simple executable memory allocator where the
allocated regions are not writable and executable in the same time.
This allocator usually uses more memory than sljitExecAllocator.
*/
#ifdef _WIN32
static SLJIT_INLINE void* alloc_chunk(sljit_uw size)
{
return VirtualAlloc(NULL, size, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
}
static SLJIT_INLINE void free_chunk(void* chunk, sljit_uw size)
{
SLJIT_UNUSED_ARG(size);
VirtualFree(chunk, 0, MEM_RELEASE);
}
static SLJIT_INLINE void enable_exec_permission(void* chunk, sljit_uw size)
{
sljit_uw *uw_ptr = (sljit_uw *)ptr;
VirtualProtect(chunk, size, PAGE_EXECUTE_READ, NULL);
}
#else
static SLJIT_INLINE void* alloc_chunk(sljit_uw size)
{
void* retval;
#ifdef MAP_ANON
retval = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANON, -1, 0);
#else
if (dev_zero < 0) {
if (open_dev_zero())
return NULL;
}
retval = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_PRIVATE, dev_zero, 0);
#endif
return (retval != MAP_FAILED) ? retval : NULL;
}
static SLJIT_INLINE void free_chunk(void* chunk, sljit_uw size)
{
munmap(chunk, size);
}
static SLJIT_INLINE void enable_exec_permission(void* chunk, sljit_uw size)
{
sljit_uw *uw_ptr = (sljit_uw *)chunk;
mprotect(uw_ptr - 1, size + sizeof(sljit_uw), PROT_READ | PROT_EXEC);
}
#endif
/* --------------------------------------------------------------------- */
/* Common functions */
/* --------------------------------------------------------------------- */
SLJIT_API_FUNC_ATTRIBUTE void* sljit_malloc_exec(sljit_uw size)
{
sljit_uw *ptr = (sljit_uw *)alloc_chunk(size + sizeof (sljit_uw));
*ptr = size;
return (void*)(ptr + 1);
}
SLJIT_API_FUNC_ATTRIBUTE void sljit_free_exec(void* ptr)
{
sljit_uw *uw_ptr = (sljit_uw *)ptr;
free_chunk(uw_ptr - 1, uw_ptr[-1]);
}
SLJIT_API_FUNC_ATTRIBUTE void sljit_enable_exec(void* from, void *to)
{
enable_exec_permission(from, ((sljit_u8 *)to) - ((sljit_u8 *)from));
}
SLJIT_API_FUNC_ATTRIBUTE void sljit_free_unused_memory_exec(void)
{
}
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