X-Git-Url: https://git.saurik.com/apple/javascriptcore.git/blobdiff_plain/4e4e5a6f2694187498445a6ac6f1634ce8141119..a253471d7f8e4d91bf6ebabab00155c3b387d3d0:/interpreter/CallFrame.h diff --git a/interpreter/CallFrame.h b/interpreter/CallFrame.h index fff6ea7..4ec3de7 100644 --- a/interpreter/CallFrame.h +++ b/interpreter/CallFrame.h @@ -1,7 +1,7 @@ /* * Copyright (C) 1999-2001 Harri Porten (porten@kde.org) * Copyright (C) 2001 Peter Kelly (pmk@post.com) - * Copyright (C) 2003, 2007, 2008 Apple Inc. All rights reserved. + * Copyright (C) 2003, 2007, 2008, 2011 Apple Inc. All rights reserved. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Library General Public @@ -23,66 +23,51 @@ #ifndef CallFrame_h #define CallFrame_h +#include "AbstractPC.h" #include "JSGlobalData.h" +#include "MacroAssemblerCodeRef.h" #include "RegisterFile.h" -#include "ScopeChain.h" namespace JSC { class Arguments; class JSActivation; class Interpreter; + class ScopeChainNode; // Represents the current state of script execution. // Passed as the first argument to most functions. class ExecState : private Register { public: - JSFunction* callee() const { return this[RegisterFile::Callee].function(); } + JSValue calleeAsValue() const { return this[RegisterFile::Callee].jsValue(); } + JSObject* callee() const { return this[RegisterFile::Callee].function(); } CodeBlock* codeBlock() const { return this[RegisterFile::CodeBlock].Register::codeBlock(); } ScopeChainNode* scopeChain() const { ASSERT(this[RegisterFile::ScopeChain].Register::scopeChain()); return this[RegisterFile::ScopeChain].Register::scopeChain(); } - int argumentCount() const { return this[RegisterFile::ArgumentCount].i(); } - - JSValue thisValue(); // Global object in which execution began. JSGlobalObject* dynamicGlobalObject(); // Global object in which the currently executing code was defined. // Differs from dynamicGlobalObject() during function calls across web browser frames. - JSGlobalObject* lexicalGlobalObject() const - { - return scopeChain()->globalObject; - } + inline JSGlobalObject* lexicalGlobalObject() const; // Differs from lexicalGlobalObject because this will have DOM window shell rather than // the actual DOM window, which can't be "this" for security reasons. - JSObject* globalThisValue() const - { - return scopeChain()->globalThis; - } + inline JSObject* globalThisValue() const; - // FIXME: Elsewhere, we use JSGlobalData* rather than JSGlobalData&. - // We should make this more uniform and either use a reference everywhere - // or a pointer everywhere. - JSGlobalData& globalData() const - { - ASSERT(scopeChain()->globalData); - return *scopeChain()->globalData; - } + inline JSGlobalData& globalData() const; // Convenience functions for access to global data. // It takes a few memory references to get from a call frame to the global data // pointer, so these are inefficient, and should be used sparingly in new code. // But they're used in many places in legacy code, so they're not going away any time soon. - void setException(JSValue exception) { globalData().exception = exception; } void clearException() { globalData().exception = JSValue(); } JSValue exception() const { return globalData().exception; } - JSValue* exceptionSlot() { return &globalData().exception; } bool hadException() const { return globalData().exception; } const CommonIdentifiers& propertyNames() const { return *globalData().propertyNames; } @@ -92,14 +77,24 @@ namespace JSC { #ifndef NDEBUG void dumpCaller(); #endif - static const HashTable* arrayTable(CallFrame* callFrame) { return callFrame->globalData().arrayTable; } + static const HashTable* arrayConstructorTable(CallFrame* callFrame) { return callFrame->globalData().arrayConstructorTable; } + static const HashTable* arrayPrototypeTable(CallFrame* callFrame) { return callFrame->globalData().arrayPrototypeTable; } + static const HashTable* booleanPrototypeTable(CallFrame* callFrame) { return callFrame->globalData().booleanPrototypeTable; } static const HashTable* dateTable(CallFrame* callFrame) { return callFrame->globalData().dateTable; } + static const HashTable* dateConstructorTable(CallFrame* callFrame) { return callFrame->globalData().dateConstructorTable; } + static const HashTable* errorPrototypeTable(CallFrame* callFrame) { return callFrame->globalData().errorPrototypeTable; } + static const HashTable* globalObjectTable(CallFrame* callFrame) { return callFrame->globalData().globalObjectTable; } static const HashTable* jsonTable(CallFrame* callFrame) { return callFrame->globalData().jsonTable; } static const HashTable* mathTable(CallFrame* callFrame) { return callFrame->globalData().mathTable; } - static const HashTable* numberTable(CallFrame* callFrame) { return callFrame->globalData().numberTable; } + static const HashTable* numberConstructorTable(CallFrame* callFrame) { return callFrame->globalData().numberConstructorTable; } + static const HashTable* numberPrototypeTable(CallFrame* callFrame) { return callFrame->globalData().numberPrototypeTable; } + static const HashTable* objectConstructorTable(CallFrame* callFrame) { return callFrame->globalData().objectConstructorTable; } + static const HashTable* objectPrototypeTable(CallFrame* callFrame) { return callFrame->globalData().objectPrototypeTable; } static const HashTable* regExpTable(CallFrame* callFrame) { return callFrame->globalData().regExpTable; } static const HashTable* regExpConstructorTable(CallFrame* callFrame) { return callFrame->globalData().regExpConstructorTable; } + static const HashTable* regExpPrototypeTable(CallFrame* callFrame) { return callFrame->globalData().regExpPrototypeTable; } static const HashTable* stringTable(CallFrame* callFrame) { return callFrame->globalData().stringTable; } + static const HashTable* stringConstructorTable(CallFrame* callFrame) { return callFrame->globalData().stringConstructorTable; } static CallFrame* create(Register* callFrameBase) { return static_cast(callFrameBase); } Register* registers() { return this; } @@ -107,50 +102,169 @@ namespace JSC { CallFrame& operator=(const Register& r) { *static_cast(this) = r; return *this; } CallFrame* callerFrame() const { return this[RegisterFile::CallerFrame].callFrame(); } - Arguments* optionalCalleeArguments() const { return this[RegisterFile::OptionalCalleeArguments].arguments(); } #if ENABLE(JIT) ReturnAddressPtr returnPC() const { return ReturnAddressPtr(this[RegisterFile::ReturnPC].vPC()); } + bool hasReturnPC() const { return !!this[RegisterFile::ReturnPC].vPC(); } + void clearReturnPC() { registers()[RegisterFile::ReturnPC] = static_cast(0); } #endif -#if ENABLE(INTERPRETER) + AbstractPC abstractReturnPC(JSGlobalData& globalData) { return AbstractPC(globalData, this); } +#if USE(JSVALUE32_64) + unsigned bytecodeOffsetForNonDFGCode() const; + void setBytecodeOffsetForNonDFGCode(unsigned offset); +#else + unsigned bytecodeOffsetForNonDFGCode() const + { + ASSERT(codeBlock()); + return this[RegisterFile::ArgumentCount].tag(); + } + + void setBytecodeOffsetForNonDFGCode(unsigned offset) + { + ASSERT(codeBlock()); + this[RegisterFile::ArgumentCount].tag() = static_cast(offset); + } +#endif + + Register* frameExtent() + { + if (!codeBlock()) + return registers(); + return frameExtentInternal(); + } + + Register* frameExtentInternal(); + +#if ENABLE(DFG_JIT) + InlineCallFrame* inlineCallFrame() const { return this[RegisterFile::ReturnPC].asInlineCallFrame(); } + unsigned codeOriginIndexForDFG() const { return this[RegisterFile::ArgumentCount].tag(); } +#else + // This will never be called if !ENABLE(DFG_JIT) since all calls should be guarded by + // isInlineCallFrame(). But to make it easier to write code without having a bunch of + // #if's, we make a dummy implementation available anyway. + InlineCallFrame* inlineCallFrame() const + { + ASSERT_NOT_REACHED(); + return 0; + } +#endif +#if ENABLE(CLASSIC_INTERPRETER) Instruction* returnVPC() const { return this[RegisterFile::ReturnPC].vPC(); } #endif +#if USE(JSVALUE32_64) + Instruction* currentVPC() const + { + return bitwise_cast(this[RegisterFile::ArgumentCount].tag()); + } + void setCurrentVPC(Instruction* vpc) + { + this[RegisterFile::ArgumentCount].tag() = bitwise_cast(vpc); + } +#else + Instruction* currentVPC() const; + void setCurrentVPC(Instruction* vpc); +#endif - void setCalleeArguments(JSValue arguments) { static_cast(this)[RegisterFile::OptionalCalleeArguments] = arguments; } void setCallerFrame(CallFrame* callerFrame) { static_cast(this)[RegisterFile::CallerFrame] = callerFrame; } void setScopeChain(ScopeChainNode* scopeChain) { static_cast(this)[RegisterFile::ScopeChain] = scopeChain; } ALWAYS_INLINE void init(CodeBlock* codeBlock, Instruction* vPC, ScopeChainNode* scopeChain, - CallFrame* callerFrame, int returnValueRegister, int argc, JSFunction* function) + CallFrame* callerFrame, int argc, JSObject* callee) { ASSERT(callerFrame); // Use noCaller() rather than 0 for the outer host call frame caller. + ASSERT(callerFrame == noCaller() || callerFrame->removeHostCallFrameFlag()->registerFile()->end() >= this); setCodeBlock(codeBlock); setScopeChain(scopeChain); setCallerFrame(callerFrame); - static_cast(this)[RegisterFile::ReturnPC] = vPC; // This is either an Instruction* or a pointer into JIT generated code stored as an Instruction*. - static_cast(this)[RegisterFile::ReturnValueRegister] = Register::withInt(returnValueRegister); - setArgumentCount(argc); // original argument count (for the sake of the "arguments" object) - setCallee(function); - setCalleeArguments(JSValue()); + setReturnPC(vPC); // This is either an Instruction* or a pointer into JIT generated code stored as an Instruction*. + setArgumentCountIncludingThis(argc); // original argument count (for the sake of the "arguments" object) + setCallee(callee); } // Read a register from the codeframe (or constant from the CodeBlock). inline Register& r(int); + // Read a register for a non-constant + inline Register& uncheckedR(int); + + // Access to arguments. + size_t argumentCount() const { return argumentCountIncludingThis() - 1; } + size_t argumentCountIncludingThis() const { return this[RegisterFile::ArgumentCount].payload(); } + static int argumentOffset(size_t argument) { return s_firstArgumentOffset - argument; } + static int argumentOffsetIncludingThis(size_t argument) { return s_thisArgumentOffset - argument; } + + JSValue argument(size_t argument) + { + if (argument >= argumentCount()) + return jsUndefined(); + return this[argumentOffset(argument)].jsValue(); + } + void setArgument(size_t argument, JSValue value) + { + this[argumentOffset(argument)] = value; + } + + static int thisArgumentOffset() { return argumentOffsetIncludingThis(0); } + JSValue thisValue() { return this[thisArgumentOffset()].jsValue(); } + void setThisValue(JSValue value) { this[thisArgumentOffset()] = value; } + + static int offsetFor(size_t argumentCountIncludingThis) { return argumentCountIncludingThis + RegisterFile::CallFrameHeaderSize; } + + // FIXME: Remove these. + int hostThisRegister() { return thisArgumentOffset(); } + JSValue hostThisValue() { return thisValue(); } static CallFrame* noCaller() { return reinterpret_cast(HostCallFrameFlag); } - int returnValueRegister() const { return this[RegisterFile::ReturnValueRegister].i(); } bool hasHostCallFrameFlag() const { return reinterpret_cast(this) & HostCallFrameFlag; } CallFrame* addHostCallFrameFlag() const { return reinterpret_cast(reinterpret_cast(this) | HostCallFrameFlag); } CallFrame* removeHostCallFrameFlag() { return reinterpret_cast(reinterpret_cast(this) & ~HostCallFrameFlag); } - private: - void setArgumentCount(int count) { static_cast(this)[RegisterFile::ArgumentCount] = Register::withInt(count); } - void setCallee(JSFunction* callee) { static_cast(this)[RegisterFile::Callee] = callee; } + void setArgumentCountIncludingThis(int count) { static_cast(this)[RegisterFile::ArgumentCount].payload() = count; } + void setCallee(JSObject* callee) { static_cast(this)[RegisterFile::Callee] = Register::withCallee(callee); } void setCodeBlock(CodeBlock* codeBlock) { static_cast(this)[RegisterFile::CodeBlock] = codeBlock; } + void setReturnPC(void* value) { static_cast(this)[RegisterFile::ReturnPC] = (Instruction*)value; } + +#if ENABLE(DFG_JIT) + bool isInlineCallFrame(); + + void setInlineCallFrame(InlineCallFrame* inlineCallFrame) { static_cast(this)[RegisterFile::ReturnPC] = inlineCallFrame; } + + // Call this to get the semantically correct JS CallFrame* for the + // currently executing function. + CallFrame* trueCallFrame(AbstractPC); + + // Call this to get the semantically correct JS CallFrame* corresponding + // to the caller. This resolves issues surrounding inlining and the + // HostCallFrameFlag stuff. + CallFrame* trueCallerFrame(); +#else + bool isInlineCallFrame() { return false; } + + CallFrame* trueCallFrame(AbstractPC) { return this; } + CallFrame* trueCallerFrame() { return callerFrame()->removeHostCallFrameFlag(); } +#endif + + // Call this to get the true call frame (accounted for inlining and any + // other optimizations), when you have entered into VM code through one + // of the "blessed" entrypoints (JITStubs or DFGOperations). This means + // that if you're pretty much anywhere in the VM you can safely call this; + // though if you were to magically get an ExecState* by, say, interrupting + // a thread that is running JS code and brutishly scraped the call frame + // register, calling this method would probably lead to horrible things + // happening. + CallFrame* trueCallFrameFromVMCode() { return trueCallFrame(AbstractPC()); } + private: static const intptr_t HostCallFrameFlag = 1; + static const int s_thisArgumentOffset = -1 - RegisterFile::CallFrameHeaderSize; + static const int s_firstArgumentOffset = s_thisArgumentOffset - 1; +#ifndef NDEBUG + RegisterFile* registerFile(); +#endif +#if ENABLE(DFG_JIT) + bool isInlineCallFrameSlow(); +#endif ExecState(); ~ExecState(); };