2017-08-12 16:48:01 +00:00
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/*
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* Copyright (C) 2013, 2016 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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2020-08-29 13:27:11 +00:00
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#include "CallFrame.h"
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2017-08-12 16:48:01 +00:00
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#include "JSCJSValue.h"
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#include <wtf/MathExtras.h>
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namespace JSC {
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// NB. Different platforms may have different requirements here. But 16 bytes is very common.
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2020-08-29 13:27:11 +00:00
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constexpr unsigned stackAlignmentBytes() { return 16; }
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2017-08-12 16:48:01 +00:00
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2020-08-29 13:27:11 +00:00
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constexpr unsigned stackAlignmentRegisters()
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2017-08-12 16:48:01 +00:00
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{
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return stackAlignmentBytes() / sizeof(EncodedJSValue);
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}
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// Align argument count taking into account the CallFrameHeaderSize may be
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// an "unaligned" count of registers.
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inline unsigned roundArgumentCountToAlignFrame(unsigned argumentCount)
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{
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return WTF::roundUpToMultipleOf(stackAlignmentRegisters(), argumentCount + CallFrame::headerSizeInRegisters) - CallFrame::headerSizeInRegisters;
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}
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// Align local register count to make the last local end on a stack aligned address given the
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// CallFrame is at an address that is stack aligned minus CallerFrameAndPC::sizeInRegisters
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inline unsigned roundLocalRegisterCountForFramePointerOffset(unsigned localRegisterCount)
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{
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return WTF::roundUpToMultipleOf(stackAlignmentRegisters(), localRegisterCount + CallerFrameAndPC::sizeInRegisters) - CallerFrameAndPC::sizeInRegisters;
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}
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inline unsigned logStackAlignmentRegisters()
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{
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return WTF::fastLog2(stackAlignmentRegisters());
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}
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} // namespace JSC
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