+++ /dev/null
-/*
- * 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 "CodeOrigin.h"
-#include "JSActivation.h"
-#include "JSFunction.h"
-#include "JSGlobalObject.h"
-#include "Interpreter.h"
-#include "ObjectConstructor.h"
-#include "WriteBarrierInlines.h"
-#include <wtf/StdLibExtras.h>
-
-namespace JSC {
-
-class Arguments : public JSNonFinalObject {
- friend class JIT;
- friend class JSArgumentsIterator;
-public:
- typedef JSNonFinalObject Base;
-
- static Arguments* create(VM& vm, CallFrame* callFrame)
- {
- Arguments* arguments = new (NotNull, allocateCell<Arguments>(vm.heap)) Arguments(callFrame);
- arguments->finishCreation(callFrame);
- return arguments;
- }
-
- static Arguments* create(VM& vm, CallFrame* callFrame, InlineCallFrame* inlineCallFrame)
- {
- Arguments* arguments = new (NotNull, allocateCell<Arguments>(vm.heap)) Arguments(callFrame);
- arguments->finishCreation(callFrame, inlineCallFrame);
- return arguments;
- }
-
- enum { MaxArguments = 0x10000 };
-
-private:
- enum NoParametersType { NoParameters };
-
- Arguments(CallFrame*);
- Arguments(CallFrame*, NoParametersType);
-
-public:
- DECLARE_INFO;
-
- static void visitChildren(JSCell*, SlotVisitor&);
- static void copyBackingStore(JSCell*, CopyVisitor&, CopyToken);
-
- void fillArgList(ExecState*, MarkedArgumentBuffer&);
-
- uint32_t length(ExecState* exec) const
- {
- if (UNLIKELY(m_overrodeLength))
- return get(exec, exec->propertyNames().length).toUInt32(exec);
- return m_numArguments;
- }
-
- void copyToArguments(ExecState*, CallFrame*, uint32_t copyLength, int32_t firstArgumentOffset);
- void tearOff(CallFrame*);
- void tearOff(CallFrame*, InlineCallFrame*);
- bool isTornOff() const { return m_registerArray.get(); }
- void didTearOffActivation(ExecState*, JSActivation*);
-
- static Structure* createStructure(VM& vm, JSGlobalObject* globalObject, JSValue prototype)
- {
- return Structure::create(vm, globalObject, prototype, TypeInfo(ArgumentsType, StructureFlags), info());
- }
-
- static ptrdiff_t offsetOfActivation() { return OBJECT_OFFSETOF(Arguments, m_activation); }
- static ptrdiff_t offsetOfNumArguments() { return OBJECT_OFFSETOF(Arguments, m_numArguments); }
- static ptrdiff_t offsetOfOverrodeLength() { return OBJECT_OFFSETOF(Arguments, m_overrodeLength); }
- static ptrdiff_t offsetOfIsStrictMode() { return OBJECT_OFFSETOF(Arguments, m_isStrictMode); }
- static ptrdiff_t offsetOfRegisters() { return OBJECT_OFFSETOF(Arguments, m_registers); }
- static ptrdiff_t offsetOfRegisterArray() { return OBJECT_OFFSETOF(Arguments, m_registerArray); }
- static ptrdiff_t offsetOfSlowArgumentData() { return OBJECT_OFFSETOF(Arguments, m_slowArgumentData); }
- static ptrdiff_t offsetOfCallee() { return OBJECT_OFFSETOF(Arguments, m_callee); }
-
- static size_t allocationSize(size_t inlineCapacity)
- {
- ASSERT_UNUSED(inlineCapacity, !inlineCapacity);
- return sizeof(Arguments);
- }
-
-protected:
- static const unsigned StructureFlags = OverridesGetOwnPropertySlot | InterceptsGetOwnPropertySlotByIndexEvenWhenLengthIsNotZero | OverridesVisitChildren | OverridesGetPropertyNames | JSObject::StructureFlags;
-
- void finishCreation(CallFrame*);
- void finishCreation(CallFrame*, InlineCallFrame*);
-
-private:
- static bool getOwnPropertySlot(JSObject*, ExecState*, PropertyName, PropertySlot&);
- static bool getOwnPropertySlotByIndex(JSObject*, ExecState*, unsigned propertyName, PropertySlot&);
- static void getOwnPropertyNames(JSObject*, ExecState*, PropertyNameArray&, EnumerationMode);
- static void put(JSCell*, ExecState*, PropertyName, JSValue, PutPropertySlot&);
- static void putByIndex(JSCell*, ExecState*, unsigned propertyName, JSValue, bool shouldThrow);
- static bool deleteProperty(JSCell*, ExecState*, PropertyName);
- static bool deletePropertyByIndex(JSCell*, ExecState*, unsigned propertyName);
- static bool defineOwnProperty(JSObject*, ExecState*, PropertyName, const PropertyDescriptor&, bool shouldThrow);
- void createStrictModeCallerIfNecessary(ExecState*);
- void createStrictModeCalleeIfNecessary(ExecState*);
-
- size_t registerArraySizeInBytes() const { return sizeof(WriteBarrier<Unknown>) * m_numArguments; }
- void allocateRegisterArray(VM&);
- bool isArgument(size_t);
- bool trySetArgument(VM&, size_t argument, JSValue);
- JSValue tryGetArgument(size_t argument);
- bool isDeletedArgument(size_t);
- bool tryDeleteArgument(VM&, size_t);
- WriteBarrierBase<Unknown>& argument(size_t);
- void allocateSlowArguments(VM&);
-
- void init(CallFrame*);
-
- WriteBarrier<JSActivation> m_activation;
-
- unsigned m_numArguments;
-
- // We make these full byte booleans to make them easy to test from the JIT,
- // and because even if they were single-bit booleans we still wouldn't save
- // any space.
- bool m_overrodeLength;
- bool m_overrodeCallee;
- bool m_overrodeCaller;
- bool m_isStrictMode;
-
- WriteBarrierBase<Unknown>* m_registers;
- CopyWriteBarrier<WriteBarrier<Unknown>> m_registerArray;
-
-public:
- struct SlowArgumentData {
- public:
- SlowArgumentData()
- : m_bytecodeToMachineCaptureOffset(0)
- {
- }
-
- SlowArgument* slowArguments()
- {
- return reinterpret_cast<SlowArgument*>(WTF::roundUpToMultipleOf<8>(reinterpret_cast<size_t>(this + 1)));
- }
-
- int bytecodeToMachineCaptureOffset() const { return m_bytecodeToMachineCaptureOffset; }
- void setBytecodeToMachineCaptureOffset(int newOffset) { m_bytecodeToMachineCaptureOffset = newOffset; }
-
- static size_t sizeForNumArguments(unsigned numArguments)
- {
- return WTF::roundUpToMultipleOf<8>(sizeof(SlowArgumentData)) + sizeof(SlowArgument) * numArguments;
- }
-
- private:
- int m_bytecodeToMachineCaptureOffset; // Add this if you have a bytecode offset into captured registers and you want the machine offset instead. Subtract if you want to do the opposite.
- };
-
-private:
- CopyWriteBarrier<SlowArgumentData> m_slowArgumentData;
-
- WriteBarrier<JSFunction> m_callee;
-};
-
-Arguments* asArguments(JSValue);
-
-inline Arguments* asArguments(JSValue value)
-{
- ASSERT(asObject(value)->inherits(Arguments::info()));
- return static_cast<Arguments*>(asObject(value));
-}
-
-inline Arguments::Arguments(CallFrame* callFrame)
- : Base(callFrame->vm(), callFrame->lexicalGlobalObject()->argumentsStructure())
-{
-}
-
-inline Arguments::Arguments(CallFrame* callFrame, NoParametersType)
- : Base(callFrame->vm(), callFrame->lexicalGlobalObject()->argumentsStructure())
-{
-}
-
-inline void Arguments::allocateSlowArguments(VM& vm)
-{
- if (!!m_slowArgumentData)
- return;
-
- void* backingStore;
- if (!vm.heap.tryAllocateStorage(this, SlowArgumentData::sizeForNumArguments(m_numArguments), &backingStore))
- RELEASE_ASSERT_NOT_REACHED();
- m_slowArgumentData.set(vm, this, static_cast<SlowArgumentData*>(backingStore));
-
- for (size_t i = 0; i < m_numArguments; ++i) {
- ASSERT(m_slowArgumentData->slowArguments()[i].status == SlowArgument::Normal);
- m_slowArgumentData->slowArguments()[i].index = CallFrame::argumentOffset(i);
- }
-}
-
-inline bool Arguments::tryDeleteArgument(VM& vm, size_t argument)
-{
- if (!isArgument(argument))
- return false;
- allocateSlowArguments(vm);
- m_slowArgumentData->slowArguments()[argument].status = SlowArgument::Deleted;
- return true;
-}
-
-inline bool Arguments::trySetArgument(VM& vm, size_t argument, JSValue value)
-{
- if (!isArgument(argument))
- return false;
- this->argument(argument).set(vm, this, value);
- return true;
-}
-
-inline JSValue Arguments::tryGetArgument(size_t argument)
-{
- if (!isArgument(argument))
- return JSValue();
- return this->argument(argument).get();
-}
-
-inline bool Arguments::isDeletedArgument(size_t argument)
-{
- if (argument >= m_numArguments)
- return false;
- if (!m_slowArgumentData)
- return false;
- if (m_slowArgumentData->slowArguments()[argument].status != SlowArgument::Deleted)
- return false;
- return true;
-}
-
-inline bool Arguments::isArgument(size_t argument)
-{
- if (argument >= m_numArguments)
- return false;
- if (m_slowArgumentData && m_slowArgumentData->slowArguments()[argument].status == SlowArgument::Deleted)
- return false;
- return true;
-}
-
-inline WriteBarrierBase<Unknown>& Arguments::argument(size_t argument)
-{
- ASSERT(isArgument(argument));
- if (!m_slowArgumentData)
- return m_registers[CallFrame::argumentOffset(argument)];
-
- int index = m_slowArgumentData->slowArguments()[argument].index;
- if (!m_activation || m_slowArgumentData->slowArguments()[argument].status != SlowArgument::Captured)
- return m_registers[index];
-
- return m_activation->registerAt(index - m_slowArgumentData->bytecodeToMachineCaptureOffset());
-}
-
-inline void Arguments::finishCreation(CallFrame* callFrame)
-{
- Base::finishCreation(callFrame->vm());
- ASSERT(inherits(info()));
-
- JSFunction* callee = jsCast<JSFunction*>(callFrame->callee());
- m_numArguments = callFrame->argumentCount();
- m_registers = reinterpret_cast<WriteBarrierBase<Unknown>*>(callFrame->registers());
- m_callee.set(callFrame->vm(), this, callee);
- m_overrodeLength = false;
- m_overrodeCallee = false;
- m_overrodeCaller = false;
- m_isStrictMode = callFrame->codeBlock()->isStrictMode();
-
- CodeBlock* codeBlock = callFrame->codeBlock();
- if (codeBlock->hasSlowArguments()) {
- SymbolTable* symbolTable = codeBlock->symbolTable();
- const SlowArgument* slowArguments = codeBlock->machineSlowArguments();
- allocateSlowArguments(callFrame->vm());
- size_t count = std::min<unsigned>(m_numArguments, symbolTable->parameterCount());
- for (size_t i = 0; i < count; ++i)
- m_slowArgumentData->slowArguments()[i] = slowArguments[i];
- m_slowArgumentData->setBytecodeToMachineCaptureOffset(
- codeBlock->framePointerOffsetToGetActivationRegisters());
- }
-
- // The bytecode generator omits op_tear_off_activation in cases of no
- // declared parameters, so we need to tear off immediately.
- if (m_isStrictMode || !callee->jsExecutable()->parameterCount())
- tearOff(callFrame);
-}
-
-inline void Arguments::finishCreation(CallFrame* callFrame, InlineCallFrame* inlineCallFrame)
-{
- Base::finishCreation(callFrame->vm());
- ASSERT(inherits(info()));
-
- JSFunction* callee = inlineCallFrame->calleeForCallFrame(callFrame);
- m_numArguments = inlineCallFrame->arguments.size() - 1;
-
- if (m_numArguments) {
- int offsetForArgumentOne = inlineCallFrame->arguments[1].virtualRegister().offset();
- m_registers = reinterpret_cast<WriteBarrierBase<Unknown>*>(callFrame->registers()) + offsetForArgumentOne - virtualRegisterForArgument(1).offset();
- } else
- m_registers = 0;
- m_callee.set(callFrame->vm(), this, callee);
- m_overrodeLength = false;
- m_overrodeCallee = false;
- m_overrodeCaller = false;
- m_isStrictMode = jsCast<FunctionExecutable*>(inlineCallFrame->executable.get())->isStrictMode();
- ASSERT(!jsCast<FunctionExecutable*>(inlineCallFrame->executable.get())->symbolTable(inlineCallFrame->isCall ? CodeForCall : CodeForConstruct)->slowArguments());
-
- // The bytecode generator omits op_tear_off_activation in cases of no
- // declared parameters, so we need to tear off immediately.
- if (m_isStrictMode || !callee->jsExecutable()->parameterCount())
- tearOff(callFrame, inlineCallFrame);
-}
-
-} // namespace JSC
-
-#endif // Arguments_h
projects / apple / javascriptcore.git / blobdiff