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