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123 lines
3.6 KiB
C
123 lines
3.6 KiB
C
/*
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+----------------------------------------------------------------------+
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| Zend Engine |
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+----------------------------------------------------------------------+
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| Copyright (c) 1998-2015 Zend Technologies Ltd. (http://www.zend.com) |
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+----------------------------------------------------------------------+
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| This source file is subject to version 2.00 of the Zend license, |
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| that is bundled with this package in the file LICENSE, and is |
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| available through the world-wide-web at the following url: |
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| http://www.zend.com/license/2_00.txt. |
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| If you did not receive a copy of the Zend license and are unable to |
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| obtain it through the world-wide-web, please send a note to |
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| license@zend.com so we can mail you a copy immediately. |
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+----------------------------------------------------------------------+
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| Authors: Dmitry Stogov <dmitry@zend.com> |
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+----------------------------------------------------------------------+
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*/
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/* $Id:$ */
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#ifndef _ZEND_ARENA_H_
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#define _ZEND_ARENA_H_
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#include "zend.h"
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typedef struct _zend_arena zend_arena;
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struct _zend_arena {
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char *ptr;
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char *end;
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zend_arena *prev;
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};
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static zend_always_inline zend_arena* zend_arena_create(size_t size)
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{
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zend_arena *arena = (zend_arena*)emalloc(size);
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arena->ptr = (char*) arena + ZEND_MM_ALIGNED_SIZE(sizeof(zend_arena));
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arena->end = (char*) arena + size;
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arena->prev = NULL;
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return arena;
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}
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static zend_always_inline void zend_arena_destroy(zend_arena *arena)
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{
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do {
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zend_arena *prev = arena->prev;
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efree(arena);
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arena = prev;
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} while (arena);
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}
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#define ZEND_ARENA_ALIGNMENT 8U
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static zend_always_inline void* zend_arena_alloc(zend_arena **arena_ptr, size_t size)
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{
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zend_arena *arena = *arena_ptr;
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char *ptr = arena->ptr;
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size = ZEND_MM_ALIGNED_SIZE(size);
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if (EXPECTED(size <= (size_t)(arena->end - ptr))) {
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arena->ptr = ptr + size;
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} else {
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size_t arena_size =
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UNEXPECTED((size + ZEND_MM_ALIGNED_SIZE(sizeof(zend_arena))) > (size_t)(arena->end - (char*) arena)) ?
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(size + ZEND_MM_ALIGNED_SIZE(sizeof(zend_arena))) :
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(size_t)(arena->end - (char*) arena);
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zend_arena *new_arena = (zend_arena*)emalloc(arena_size);
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ptr = (char*) new_arena + ZEND_MM_ALIGNED_SIZE(sizeof(zend_arena));
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new_arena->ptr = (char*) new_arena + ZEND_MM_ALIGNED_SIZE(sizeof(zend_arena)) + size;
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new_arena->end = (char*) new_arena + arena_size;
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new_arena->prev = arena;
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*arena_ptr = new_arena;
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}
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return (void*) ptr;
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}
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static zend_always_inline void* zend_arena_calloc(zend_arena **arena_ptr, size_t count, size_t unit_size)
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{
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int overflow;
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size_t size;
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void *ret;
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size = zend_safe_address(unit_size, count, 0, &overflow);
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if (UNEXPECTED(overflow)) {
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zend_error(E_ERROR, "Possible integer overflow in zend_arena_calloc() (%zu * %zu)", unit_size, count);
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}
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ret = zend_arena_alloc(arena_ptr, size);
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memset(ret, 0, size);
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return ret;
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}
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static zend_always_inline void* zend_arena_checkpoint(zend_arena *arena)
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{
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return arena->ptr;
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}
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static zend_always_inline void zend_arena_release(zend_arena **arena_ptr, void *checkpoint)
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{
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zend_arena *arena = *arena_ptr;
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while (UNEXPECTED((char*)checkpoint > arena->end) ||
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UNEXPECTED((char*)checkpoint < (char*)arena)) {
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zend_arena *prev = arena->prev;
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efree(arena);
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*arena_ptr = arena = prev;
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}
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arena->ptr = (char*)checkpoint;
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}
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#endif /* _ZEND_ARENA_H_ */
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/*
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* Local variables:
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* tab-width: 4
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* c-basic-offset: 4
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* indent-tabs-mode: t
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* End:
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*/
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