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Editing: zend_arena.h
/* +----------------------------------------------------------------------+ | 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: Dmitry Stogov <dmitry@php.net> | +----------------------------------------------------------------------+ */ #ifndef _ZEND_ARENA_H_ #define _ZEND_ARENA_H_ #include "zend.h" #ifndef ZEND_TRACK_ARENA_ALLOC typedef struct _zend_arena zend_arena; struct _zend_arena { char *ptr; char *end; zend_arena *prev; }; static zend_always_inline zend_arena* zend_arena_create(size_t size) { zend_arena *arena = (zend_arena*)emalloc(size); arena->ptr = (char*) arena + ZEND_MM_ALIGNED_SIZE(sizeof(zend_arena)); arena->end = (char*) arena + size; arena->prev = NULL; return arena; } static zend_always_inline void zend_arena_destroy(zend_arena *arena) { do { zend_arena *prev = arena->prev; efree(arena); arena = prev; } while (arena); } static zend_always_inline void* zend_arena_alloc(zend_arena **arena_ptr, size_t size) { zend_arena *arena = *arena_ptr; char *ptr = arena->ptr; size = ZEND_MM_ALIGNED_SIZE(size); if (EXPECTED(size <= (size_t)(arena->end - ptr))) { arena->ptr = ptr + size; } else { size_t arena_size = UNEXPECTED((size + ZEND_MM_ALIGNED_SIZE(sizeof(zend_arena))) > (size_t)(arena->end - (char*) arena)) ? (size + ZEND_MM_ALIGNED_SIZE(sizeof(zend_arena))) : (size_t)(arena->end - (char*) arena); zend_arena *new_arena = (zend_arena*)emalloc(arena_size); ptr = (char*) new_arena + ZEND_MM_ALIGNED_SIZE(sizeof(zend_arena)); new_arena->ptr = (char*) new_arena + ZEND_MM_ALIGNED_SIZE(sizeof(zend_arena)) + size; new_arena->end = (char*) new_arena + arena_size; new_arena->prev = arena; *arena_ptr = new_arena; } return (void*) ptr; } static zend_always_inline void* zend_arena_calloc(zend_arena **arena_ptr, size_t count, size_t unit_size) { int overflow; size_t size; void *ret; size = zend_safe_address(unit_size, count, 0, &overflow); if (UNEXPECTED(overflow)) { zend_error(E_ERROR, "Possible integer overflow in zend_arena_calloc() (%zu * %zu)", unit_size, count); } ret = zend_arena_alloc(arena_ptr, size); memset(ret, 0, size); return ret; } static zend_always_inline void* zend_arena_checkpoint(zend_arena *arena) { return arena->ptr; } static zend_always_inline void zend_arena_release(zend_arena **arena_ptr, void *checkpoint) { zend_arena *arena = *arena_ptr; while (UNEXPECTED((char*)checkpoint > arena->end) || UNEXPECTED((char*)checkpoint <= (char*)arena)) { zend_arena *prev = arena->prev; efree(arena); *arena_ptr = arena = prev; } ZEND_ASSERT((char*)checkpoint > (char*)arena && (char*)checkpoint <= arena->end); arena->ptr = (char*)checkpoint; } static zend_always_inline zend_bool zend_arena_contains(zend_arena *arena, void *ptr) { while (arena) { if ((char*)ptr > (char*)arena && (char*)ptr <= arena->ptr) { return 1; } arena = arena->prev; } return 0; } #else /* Use normal allocations and keep track of them for mass-freeing. * This is intended for use with asan/valgrind. */ typedef struct _zend_arena zend_arena; struct _zend_arena { void **ptr; void **end; struct _zend_arena *prev; void *ptrs[0]; }; #define ZEND_TRACKED_ARENA_SIZE 1000 static zend_always_inline zend_arena *zend_arena_create(size_t _size) { zend_arena *arena = (zend_arena*) emalloc( sizeof(zend_arena) + sizeof(void *) * ZEND_TRACKED_ARENA_SIZE); arena->ptr = &arena->ptrs[0]; arena->end = &arena->ptrs[ZEND_TRACKED_ARENA_SIZE]; arena->prev = NULL; return arena; } static zend_always_inline void zend_arena_destroy(zend_arena *arena) { do { zend_arena *prev = arena->prev; void **ptr; for (ptr = arena->ptrs; ptr < arena->ptr; ptr++) { efree(*ptr); } efree(arena); arena = prev; } while (arena); } static zend_always_inline void *zend_arena_alloc(zend_arena **arena_ptr, size_t size) { zend_arena *arena = *arena_ptr; if (arena->ptr == arena->end) { *arena_ptr = zend_arena_create(0); (*arena_ptr)->prev = arena; arena = *arena_ptr; } return *arena->ptr++ = emalloc(size); } static zend_always_inline void* zend_arena_calloc(zend_arena **arena_ptr, size_t count, size_t unit_size) { int overflow; size_t size; void *ret; size = zend_safe_address(unit_size, count, 0, &overflow); if (UNEXPECTED(overflow)) { zend_error(E_ERROR, "Possible integer overflow in zend_arena_calloc() (%zu * %zu)", unit_size, count); } ret = zend_arena_alloc(arena_ptr, size); memset(ret, 0, size); return ret; } static zend_always_inline void* zend_arena_checkpoint(zend_arena *arena) { return arena->ptr; } static zend_always_inline void zend_arena_release(zend_arena **arena_ptr, void *checkpoint) { while (1) { zend_arena *arena = *arena_ptr; zend_arena *prev = arena->prev; while (1) { if (arena->ptr == (void **) checkpoint) { return; } if (arena->ptr == arena->ptrs) { break; } arena->ptr--; efree(*arena->ptr); } efree(arena); *arena_ptr = prev; ZEND_ASSERT(*arena_ptr); } } static zend_always_inline zend_bool zend_arena_contains(zend_arena *arena, void *ptr) { /* TODO: Dummy */ return 1; } #endif #endif /* _ZEND_ARENA_H_ */
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