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-rw-r--r--JavaScriptCore/runtime/Arguments.h255
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diff --git a/JavaScriptCore/runtime/Arguments.h b/JavaScriptCore/runtime/Arguments.h
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-/*
- * Copyright (C) 1999-2000 Harri Porten (porten@kde.org)
- * Copyright (C) 2003, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
- * Copyright (C) 2007 Cameron Zwarich (cwzwarich@uwaterloo.ca)
- * Copyright (C) 2007 Maks Orlovich
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library General Public
- * License as published by the Free Software Foundation; either
- * version 2 of the License, or (at your option) any later version.
- *
- * This library is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public License
- * along with this library; see the file COPYING.LIB. If not, write to
- * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
- * Boston, MA 02110-1301, USA.
- *
- */
-
-#ifndef Arguments_h
-#define Arguments_h
-
-#include "JSActivation.h"
-#include "JSFunction.h"
-#include "JSGlobalObject.h"
-#include "Interpreter.h"
-#include "ObjectConstructor.h"
-#include "PrototypeFunction.h"
-
-namespace JSC {
-
- struct ArgumentsData : Noncopyable {
- JSActivation* activation;
-
- unsigned numParameters;
- ptrdiff_t firstParameterIndex;
- unsigned numArguments;
-
- Register* registers;
- OwnArrayPtr<Register> registerArray;
-
- Register* extraArguments;
- OwnArrayPtr<bool> deletedArguments;
- Register extraArgumentsFixedBuffer[4];
-
- JSFunction* callee;
- bool overrodeLength : 1;
- bool overrodeCallee : 1;
- bool overrodeCaller : 1;
- bool isStrictMode : 1;
- };
-
-
- class Arguments : public JSObject {
- public:
- // Use an enum because otherwise gcc insists on doing a memory
- // read.
- enum { MaxArguments = 0x10000 };
-
- enum NoParametersType { NoParameters };
-
- Arguments(CallFrame*);
- Arguments(CallFrame*, NoParametersType);
- virtual ~Arguments();
-
- static const ClassInfo info;
-
- virtual void markChildren(MarkStack&);
-
- void fillArgList(ExecState*, MarkedArgumentBuffer&);
-
- uint32_t numProvidedArguments(ExecState* exec) const
- {
- if (UNLIKELY(d->overrodeLength))
- return get(exec, exec->propertyNames().length).toUInt32(exec);
- return d->numArguments;
- }
-
- void copyToRegisters(ExecState* exec, Register* buffer, uint32_t maxSize);
- void copyRegisters();
- bool isTornOff() const { return d->registerArray; }
- void setActivation(JSActivation* activation)
- {
- d->activation = activation;
- d->registers = &activation->registerAt(0);
- }
-
- static PassRefPtr<Structure> createStructure(JSValue prototype)
- {
- return Structure::create(prototype, TypeInfo(ObjectType, StructureFlags), AnonymousSlotCount);
- }
-
- protected:
- static const unsigned StructureFlags = OverridesGetOwnPropertySlot | OverridesMarkChildren | OverridesGetPropertyNames | JSObject::StructureFlags;
-
- private:
- void getArgumentsData(CallFrame*, JSFunction*&, ptrdiff_t& firstParameterIndex, Register*& argv, int& argc);
- virtual bool getOwnPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&);
- virtual bool getOwnPropertySlot(ExecState*, unsigned propertyName, PropertySlot&);
- virtual bool getOwnPropertyDescriptor(ExecState*, const Identifier&, PropertyDescriptor&);
- virtual void getOwnPropertyNames(ExecState*, PropertyNameArray&, EnumerationMode mode = ExcludeDontEnumProperties);
- virtual void put(ExecState*, const Identifier& propertyName, JSValue, PutPropertySlot&);
- virtual void put(ExecState*, unsigned propertyName, JSValue, PutPropertySlot&);
- virtual bool deleteProperty(ExecState*, const Identifier& propertyName);
- virtual bool deleteProperty(ExecState*, unsigned propertyName);
- void createStrictModeCallerIfNecessary(ExecState*);
- void createStrictModeCalleeIfNecessary(ExecState*);
-
- virtual const ClassInfo* classInfo() const { return &info; }
-
- void init(CallFrame*);
-
- OwnPtr<ArgumentsData> d;
- };
-
- Arguments* asArguments(JSValue);
-
- inline Arguments* asArguments(JSValue value)
- {
- ASSERT(asObject(value)->inherits(&Arguments::info));
- return static_cast<Arguments*>(asObject(value));
- }
-
- ALWAYS_INLINE void Arguments::getArgumentsData(CallFrame* callFrame, JSFunction*& function, ptrdiff_t& firstParameterIndex, Register*& argv, int& argc)
- {
- function = asFunction(callFrame->callee());
-
- int numParameters = function->jsExecutable()->parameterCount();
- argc = callFrame->argumentCountIncludingThis();
-
- if (argc <= numParameters)
- argv = callFrame->registers() - RegisterFile::CallFrameHeaderSize - numParameters;
- else
- argv = callFrame->registers() - RegisterFile::CallFrameHeaderSize - numParameters - argc;
-
- argc -= 1; // - 1 to skip "this"
- firstParameterIndex = -RegisterFile::CallFrameHeaderSize - numParameters;
- }
-
- inline Arguments::Arguments(CallFrame* callFrame)
- : JSObject(callFrame->lexicalGlobalObject()->argumentsStructure())
- , d(adoptPtr(new ArgumentsData))
- {
- JSFunction* callee;
- ptrdiff_t firstParameterIndex;
- Register* argv;
- int numArguments;
- getArgumentsData(callFrame, callee, firstParameterIndex, argv, numArguments);
-
- d->numParameters = callee->jsExecutable()->parameterCount();
- d->firstParameterIndex = firstParameterIndex;
- d->numArguments = numArguments;
-
- d->activation = 0;
- d->registers = callFrame->registers();
-
- Register* extraArguments;
- if (d->numArguments <= d->numParameters)
- extraArguments = 0;
- else {
- unsigned numExtraArguments = d->numArguments - d->numParameters;
- if (numExtraArguments > sizeof(d->extraArgumentsFixedBuffer) / sizeof(Register))
- extraArguments = new Register[numExtraArguments];
- else
- extraArguments = d->extraArgumentsFixedBuffer;
- for (unsigned i = 0; i < numExtraArguments; ++i)
- extraArguments[i] = argv[d->numParameters + i];
- }
-
- d->extraArguments = extraArguments;
-
- d->callee = callee;
- d->overrodeLength = false;
- d->overrodeCallee = false;
- d->overrodeCaller = false;
- d->isStrictMode = callFrame->codeBlock()->isStrictMode();
- if (d->isStrictMode)
- copyRegisters();
- }
-
- inline Arguments::Arguments(CallFrame* callFrame, NoParametersType)
- : JSObject(callFrame->lexicalGlobalObject()->argumentsStructure())
- , d(adoptPtr(new ArgumentsData))
- {
- ASSERT(!asFunction(callFrame->callee())->jsExecutable()->parameterCount());
-
- unsigned numArguments = callFrame->argumentCount();
-
- d->numParameters = 0;
- d->numArguments = numArguments;
- d->activation = 0;
-
- Register* extraArguments;
- if (numArguments > sizeof(d->extraArgumentsFixedBuffer) / sizeof(Register))
- extraArguments = new Register[numArguments];
- else
- extraArguments = d->extraArgumentsFixedBuffer;
-
- Register* argv = callFrame->registers() - RegisterFile::CallFrameHeaderSize - numArguments - 1;
- for (unsigned i = 0; i < numArguments; ++i)
- extraArguments[i] = argv[i];
-
- d->extraArguments = extraArguments;
-
- d->callee = asFunction(callFrame->callee());
- d->overrodeLength = false;
- d->overrodeCallee = false;
- d->overrodeCaller = false;
- d->isStrictMode = callFrame->codeBlock()->isStrictMode();
- if (d->isStrictMode)
- copyRegisters();
- }
-
- inline void Arguments::copyRegisters()
- {
- ASSERT(!isTornOff());
-
- if (!d->numParameters)
- return;
-
- int registerOffset = d->numParameters + RegisterFile::CallFrameHeaderSize;
- size_t registerArraySize = d->numParameters;
-
- Register* registerArray = new Register[registerArraySize];
- memcpy(registerArray, d->registers - registerOffset, registerArraySize * sizeof(Register));
- d->registerArray.set(registerArray);
- d->registers = registerArray + registerOffset;
- }
-
- // This JSActivation function is defined here so it can get at Arguments::setRegisters.
- inline void JSActivation::copyRegisters()
- {
- ASSERT(!d()->registerArray);
-
- size_t numParametersMinusThis = d()->functionExecutable->parameterCount();
- size_t numVars = d()->functionExecutable->capturedVariableCount();
- size_t numLocals = numVars + numParametersMinusThis;
-
- if (!numLocals)
- return;
-
- int registerOffset = numParametersMinusThis + RegisterFile::CallFrameHeaderSize;
- size_t registerArraySize = numLocals + RegisterFile::CallFrameHeaderSize;
-
- Register* registerArray = copyRegisterArray(d()->registers - registerOffset, registerArraySize);
- setRegisters(registerArray + registerOffset, registerArray);
- }
-
-} // namespace JSC
-
-#endif // Arguments_h
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