mirror of
https://github.com/darlinghq/darling-WTF.git
synced 2024-11-23 03:49:41 +00:00
62 lines
2.3 KiB
C++
62 lines
2.3 KiB
C++
/*
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* Copyright (C) 2018 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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namespace WTF {
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#if defined(NDEBUG) && COMPILER(GCC_COMPATIBLE) \
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&& (CPU(X86_64) || CPU(X86) || CPU(ARM64) || CPU(ARM_THUMB2) || CPU(ARM_TRADITIONAL))
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// We can only use the inline asm implementation on release builds because it
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// needs to be inlinable in order to be correct.
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ALWAYS_INLINE void* currentStackPointer()
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{
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void* stackPointer = nullptr;
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#if CPU(X86_64)
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__asm__ volatile ("movq %%rsp, %0" : "=r"(stackPointer) ::);
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#elif CPU(X86)
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__asm__ volatile ("movl %%esp, %0" : "=r"(stackPointer) ::);
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#elif CPU(ARM64) && defined(__ILP32__)
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uint64_t stackPointerRegister = 0;
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__asm__ volatile ("mov %0, sp" : "=r"(stackPointerRegister) ::);
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stackPointer = reinterpret_cast<void*>(stackPointerRegister);
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#elif CPU(ARM64) || CPU(ARM_THUMB2) || CPU(ARM_TRADITIONAL)
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__asm__ volatile ("mov %0, sp" : "=r"(stackPointer) ::);
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#endif
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return stackPointer;
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}
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#else
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#define USE_GENERIC_CURRENT_STACK_POINTER 1
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WTF_EXPORT_PRIVATE void* currentStackPointer();
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#endif
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} // namespace WTF
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using WTF::currentStackPointer;
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