48 lines
1.9 KiB
C++
48 lines
1.9 KiB
C++
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/*
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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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#include "config.h"
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#include "StackPointer.h"
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namespace WTF {
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#if USE(GENERIC_CURRENT_STACK_POINTER)
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constexpr size_t sizeOfFrameHeader = 2 * sizeof(void*);
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SUPPRESS_ASAN NEVER_INLINE
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void* currentStackPointer()
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{
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#if COMPILER(GCC_COMPATIBLE)
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return reinterpret_cast<uint8_t*>(__builtin_frame_address(0)) + sizeOfFrameHeader;
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#else
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// Make sure that sp is the only local variable declared in this function.
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void* sp = reinterpret_cast<uint8_t*>(&sp) + sizeOfFrameHeader + sizeof(sp);
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return sp;
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#endif
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}
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#endif // USE(GENERIC_CURRENT_STACK_POINTER)
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} // namespace WTF
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