/* +----------------------------------------------------------------------+ | 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: Arnaud Le Blanc <arnaud.lb@gmail.com> | +----------------------------------------------------------------------+ */ #ifndef ZEND_CALL_STACK_H #define ZEND_CALL_STACK_H #include "zend.h" #include "zend_portability.h" #ifdef __APPLE__ # include <pthread.h> #endif #ifdef ZEND_CHECK_STACK_LIMIT typedef struct _zend_call_stack { void *base; size_t max_size; } zend_call_stack; ZEND_API void zend_call_stack_init(void); ZEND_API bool zend_call_stack_get(zend_call_stack *stack); /** Returns an approximation of the current stack position */ static zend_always_inline void *zend_call_stack_position(void) { #ifdef ZEND_WIN32 return _AddressOfReturnAddress(); #elif PHP_HAVE_BUILTIN_FRAME_ADDRESS return __builtin_frame_address(0); #else void *a; void *pos = (void*)&a; return pos; #endif } static zend_always_inline bool zend_call_stack_overflowed(void *stack_limit) { return (uintptr_t) zend_call_stack_position() <= (uintptr_t) stack_limit; } static inline void* zend_call_stack_limit(void *base, size_t size, size_t reserved_size) { if (UNEXPECTED(size > (uintptr_t)base)) { return (void*)0; } base = (int8_t*)base - size; if (UNEXPECTED(UINTPTR_MAX - (uintptr_t)base < reserved_size)) { return (void*)UINTPTR_MAX; } return (int8_t*)base + reserved_size; } static inline size_t zend_call_stack_default_size(void) { #ifdef __linux__ return 8 * 1024 * 1024; #endif #if defined(__FreeBSD__) || defined(__NetBSD__) return 4 * 1024 * 1024; #endif #ifdef __OpenBSD__ return 512 * 1024; #endif #ifdef __APPLE__ // https://developer.apple.com/library/archive/documentation/Cocoa/Conceptual/Multithreading/CreatingThreads/CreatingThreads.html if (pthread_main_np()) { return 8 * 1024 * 1024; } return 512 * 1024; #endif return 2 * 1024 * 1024; } #endif /* ZEND_CHECK_STACK_LIMIT */ #endif /* ZEND_CALL_STACK_H */