/* * Copyright (C) 2018 Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #pragma once namespace WTF { #if defined(NDEBUG) && COMPILER(GCC_COMPATIBLE) \ && (CPU(X86_64) || CPU(X86) || CPU(ARM64) || CPU(ARM_THUMB2) || CPU(ARM_TRADITIONAL)) // We can only use the inline asm implementation on release builds because it // needs to be inlinable in order to be correct. ALWAYS_INLINE void* currentStackPointer() { void* stackPointer = nullptr; #if CPU(X86_64) __asm__ volatile ("movq %%rsp, %0" : "=r"(stackPointer) ::); #elif CPU(X86) __asm__ volatile ("movl %%esp, %0" : "=r"(stackPointer) ::); #elif CPU(ARM64) && defined(__ILP32__) uint64_t stackPointerRegister = 0; __asm__ volatile ("mov %0, sp" : "=r"(stackPointerRegister) ::); stackPointer = reinterpret_cast<void*>(stackPointerRegister); #elif CPU(ARM64) || CPU(ARM_THUMB2) || CPU(ARM_TRADITIONAL) __asm__ volatile ("mov %0, sp" : "=r"(stackPointer) ::); #endif return stackPointer; } #else #define USE_GENERIC_CURRENT_STACK_POINTER 1 WTF_EXPORT_PRIVATE void* currentStackPointer(); #endif } // namespace WTF using WTF::currentStackPointer;