/* | |
* 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 "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: | |
JSFunction* 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; | |
} | |
// 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; | |
} | |
// 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; | |
} | |
// 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; } | |
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(); } | |
Arguments* optionalCalleeArguments() const { return this[RegisterFile::OptionalCalleeArguments].arguments(); } | |
Instruction* returnPC() const { return this[RegisterFile::ReturnPC].vPC(); } | |
void setCalleeArguments(JSValue arguments) { static_cast<Register*>(this)[RegisterFile::OptionalCalleeArguments] = arguments; } | |
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 returnValueRegister, int argc, JSFunction* function) | |
{ | |
ASSERT(callerFrame); // Use noCaller() rather than 0 for the outer host call frame caller. | |
setCodeBlock(codeBlock); | |
setScopeChain(scopeChain); | |
setCallerFrame(callerFrame); | |
static_cast<Register*>(this)[RegisterFile::ReturnPC] = vPC; // This is either an Instruction* or a pointer into JIT generated code stored as an Instruction*. | |
static_cast<Register*>(this)[RegisterFile::ReturnValueRegister] = Register::withInt(returnValueRegister); | |
setArgumentCount(argc); // original argument count (for the sake of the "arguments" object) | |
setCallee(function); | |
setCalleeArguments(JSValue()); | |
} | |
// Read a register from the codeframe (or constant from the CodeBlock). | |
inline Register& r(int); | |
static CallFrame* noCaller() { return reinterpret_cast<CallFrame*>(HostCallFrameFlag); } | |
int returnValueRegister() const { return this[RegisterFile::ReturnValueRegister].i(); } | |
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); } | |
private: | |
void setArgumentCount(int count) { static_cast<Register*>(this)[RegisterFile::ArgumentCount] = Register::withInt(count); } | |
void setCallee(JSFunction* callee) { static_cast<Register*>(this)[RegisterFile::Callee] = callee; } | |
void setCodeBlock(CodeBlock* codeBlock) { static_cast<Register*>(this)[RegisterFile::CodeBlock] = codeBlock; } | |
static const intptr_t HostCallFrameFlag = 1; | |
ExecState(); | |
~ExecState(); | |
}; | |
} // namespace JSC | |
#endif // CallFrame_h |