diff options
Diffstat (limited to 'Source/JavaScriptCore/interpreter/CallFrame.h')
| -rw-r--r-- | Source/JavaScriptCore/interpreter/CallFrame.h | 214 |
1 files changed, 214 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/interpreter/CallFrame.h b/Source/JavaScriptCore/interpreter/CallFrame.h new file mode 100644 index 000000000..d5037b794 --- /dev/null +++ b/Source/JavaScriptCore/interpreter/CallFrame.h @@ -0,0 +1,214 @@ +/* + * Copyright (C) 1999-2001 Harri Porten (porten@kde.org) + * Copyright (C) 2001 Peter Kelly (pmk@post.com) + * 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 + * 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 CallFrame_h +#define CallFrame_h + +#include "JSGlobalData.h" +#include "MacroAssemblerCodeRef.h" +#include "RegisterFile.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: + 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(); + } + + // 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. + 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. + inline JSObject* globalThisValue() const; + + 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 clearException() { globalData().exception = JSValue(); } + JSValue exception() const { return globalData().exception; } + bool hadException() const { return globalData().exception; } + + const CommonIdentifiers& propertyNames() const { return *globalData().propertyNames; } + const MarkedArgumentBuffer& emptyList() const { return *globalData().emptyList; } + Interpreter* interpreter() { return globalData().interpreter; } + Heap* heap() { return &globalData().heap; } +#ifndef NDEBUG + void dumpCaller(); +#endif + 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* 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<CallFrame*>(callFrameBase); } + Register* registers() { return this; } + + CallFrame& operator=(const Register& r) { *static_cast<Register*>(this) = r; return *this; } + + CallFrame* callerFrame() const { return this[RegisterFile::CallerFrame].callFrame(); } +#if ENABLE(JIT) + ReturnAddressPtr returnPC() const { return ReturnAddressPtr(this[RegisterFile::ReturnPC].vPC()); } +#endif +#if ENABLE(DFG_JIT) + InlineCallFrame* inlineCallFrame() const { return this[RegisterFile::ReturnPC].asInlineCallFrame(); } +#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(INTERPRETER) + Instruction* returnVPC() const { return this[RegisterFile::ReturnPC].vPC(); } +#endif + + void setCallerFrame(CallFrame* callerFrame) { static_cast<Register*>(this)[RegisterFile::CallerFrame] = callerFrame; } + void setScopeChain(ScopeChainNode* scopeChain) { static_cast<Register*>(this)[RegisterFile::ScopeChain] = scopeChain; } + + ALWAYS_INLINE void init(CodeBlock* codeBlock, Instruction* vPC, ScopeChainNode* scopeChain, + 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); + 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<CallFrame*>(HostCallFrameFlag); } + + bool hasHostCallFrameFlag() const { return reinterpret_cast<intptr_t>(this) & HostCallFrameFlag; } + CallFrame* addHostCallFrameFlag() const { return reinterpret_cast<CallFrame*>(reinterpret_cast<intptr_t>(this) | HostCallFrameFlag); } + CallFrame* removeHostCallFrameFlag() { return reinterpret_cast<CallFrame*>(reinterpret_cast<intptr_t>(this) & ~HostCallFrameFlag); } + + void setArgumentCountIncludingThis(int count) { static_cast<Register*>(this)[RegisterFile::ArgumentCount].payload() = count; } + void setCallee(JSObject* callee) { static_cast<Register*>(this)[RegisterFile::Callee] = Register::withCallee(callee); } + void setCodeBlock(CodeBlock* codeBlock) { static_cast<Register*>(this)[RegisterFile::CodeBlock] = codeBlock; } + void setReturnPC(void* value) { static_cast<Register*>(this)[RegisterFile::ReturnPC] = (Instruction*)value; } + +#if ENABLE(DFG_JIT) + bool isInlineCallFrame(); + + void setInlineCallFrame(InlineCallFrame* inlineCallFrame) { static_cast<Register*>(this)[RegisterFile::ReturnPC] = inlineCallFrame; } + + // Call this to get the semantically correct JS CallFrame*. This resolves issues + // surrounding inlining and the HostCallFrameFlag stuff. + CallFrame* trueCallerFrame(); +#else + bool isInlineCallFrame() { return false; } + + CallFrame* trueCallerFrame() { return callerFrame()->removeHostCallFrameFlag(); } +#endif + + 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(); + }; + +} // namespace JSC + +#endif // CallFrame_h |