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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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