mirror of
https://github.com/darlinghq/darling-JavaScriptCore.git
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100 lines
3.8 KiB
C++
100 lines
3.8 KiB
C++
/*
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* Copyright (C) 2013-2018 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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#include "CodeBlock.h"
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#include "Register.h"
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#include "StackAlignment.h"
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#include <wtf/ForbidHeapAllocation.h>
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namespace JSC {
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struct JS_EXPORT_PRIVATE ProtoCallFrame {
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WTF_FORBID_HEAP_ALLOCATION;
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public:
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// CodeBlock, Callee, ArgumentCount, and |this|.
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static constexpr unsigned numberOfRegisters { 4 };
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Register codeBlockValue;
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Register calleeValue;
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Register argCountAndCodeOriginValue;
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Register thisArg;
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uint32_t paddedArgCount;
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bool hasArityMismatch;
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JSValue *args;
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void init(CodeBlock*, JSObject*, JSValue, int, JSValue* otherArgs = 0);
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CodeBlock* codeBlock() const { return codeBlockValue.Register::codeBlock(); }
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void setCodeBlock(CodeBlock* codeBlock) { codeBlockValue = codeBlock; }
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JSObject* callee() const { return calleeValue.Register::object(); }
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void setCallee(JSObject* callee) { calleeValue = callee; }
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int argumentCountIncludingThis() const { return argCountAndCodeOriginValue.payload(); }
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int argumentCount() const { return argumentCountIncludingThis() - 1; }
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void setArgumentCountIncludingThis(int count) { argCountAndCodeOriginValue.payload() = count; }
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void setPaddedArgCount(uint32_t argCount) { paddedArgCount = argCount; }
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void clearCurrentVPC() { argCountAndCodeOriginValue.tag() = 0; }
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JSValue thisValue() const { return thisArg.Register::jsValue(); }
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void setThisValue(JSValue value) { thisArg = value; }
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bool needArityCheck() { return hasArityMismatch; }
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JSValue argument(size_t argumentIndex)
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{
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ASSERT(static_cast<int>(argumentIndex) < argumentCount());
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return args[argumentIndex];
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}
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void setArgument(size_t argumentIndex, JSValue value)
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{
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ASSERT(static_cast<int>(argumentIndex) < argumentCount());
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args[argumentIndex] = value;
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}
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};
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inline void ProtoCallFrame::init(CodeBlock* codeBlock, JSObject* callee, JSValue thisValue, int argCountIncludingThis, JSValue* otherArgs)
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{
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this->args = otherArgs;
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this->setCodeBlock(codeBlock);
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this->setCallee(callee);
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this->setArgumentCountIncludingThis(argCountIncludingThis);
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if (codeBlock && argCountIncludingThis < codeBlock->numParameters())
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this->hasArityMismatch = true;
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else
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this->hasArityMismatch = false;
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// Round up argCountIncludingThis to keep the stack frame size aligned.
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size_t paddedArgsCount = roundArgumentCountToAlignFrame(argCountIncludingThis);
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this->setPaddedArgCount(paddedArgsCount);
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this->clearCurrentVPC();
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this->setThisValue(thisValue);
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}
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} // namespace JSC
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