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Diffstat (limited to 'Source/JavaScriptCore/interpreter/CallFrame.h')
| -rw-r--r-- | Source/JavaScriptCore/interpreter/CallFrame.h | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/Source/JavaScriptCore/interpreter/CallFrame.h b/Source/JavaScriptCore/interpreter/CallFrame.h new file mode 100644 index 0000000..2797ef3 --- /dev/null +++ b/Source/JavaScriptCore/interpreter/CallFrame.h @@ -0,0 +1,167 @@ +/* + * 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. + * + * 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" +#include "ScopeChain.h" + +namespace JSC { + + class Arguments; + class JSActivation; + class Interpreter; + + // Represents the current state of script execution. + // Passed as the first argument to most functions. + class ExecState : private Register { + public: + 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. + JSGlobalObject* lexicalGlobalObject() const + { + return scopeChain()->globalObject; + } + + // 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; + } + + JSGlobalData& globalData() const + { + ASSERT(scopeChain()->globalData); + return *scopeChain()->globalData; + } + + // 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* arrayTable(CallFrame* callFrame) { return callFrame->globalData().arrayTable; } + static const HashTable* dateTable(CallFrame* callFrame) { return callFrame->globalData().dateTable; } + 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* regExpTable(CallFrame* callFrame) { return callFrame->globalData().regExpTable; } + static const HashTable* regExpConstructorTable(CallFrame* callFrame) { return callFrame->globalData().regExpConstructorTable; } + static const HashTable* stringTable(CallFrame* callFrame) { return callFrame->globalData().stringTable; } + + 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(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. + int hostThisRegister() { return -RegisterFile::CallFrameHeaderSize - argumentCountIncludingThis(); } + JSValue hostThisValue() { return this[hostThisRegister()].jsValue(); } + size_t argumentCount() const { return argumentCountIncludingThis() - 1; } + size_t argumentCountIncludingThis() const { return this[RegisterFile::ArgumentCount].i(); } + JSValue argument(int argumentNumber) + { + int argumentIndex = -RegisterFile::CallFrameHeaderSize - this[RegisterFile::ArgumentCount].i() + argumentNumber + 1; + if (argumentIndex >= -RegisterFile::CallFrameHeaderSize) + return jsUndefined(); + return this[argumentIndex].jsValue(); + } + + 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] = Register::withInt(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; } + + private: + static const intptr_t HostCallFrameFlag = 1; +#ifndef NDEBUG + RegisterFile* registerFile(); +#endif + ExecState(); + ~ExecState(); + }; + +} // namespace JSC + +#endif // CallFrame_h |