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/*
+----------------------------------------------------------------------+
| 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; /* high address of the stack */
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 defined(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
#if defined(__DragonFly__)
return 2 * 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
#ifdef __HAIKU__
return 64 * 4096;
#endif
#ifdef __sun
return 8 * 4096;
#endif
return 2 * 1024 * 1024;
}
#endif /* ZEND_CHECK_STACK_LIMIT */
#endif /* ZEND_CALL_STACK_H */
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