/* * Copyright (C) 2008 Apple Inc. All rights reserved. * Copyright (C) 2008 Cameron Zwarich * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of * its contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "config.h" #include "Machine.h" #include "CodeBlock.h" #include "DebuggerCallFrame.h" #include "ExceptionHelpers.h" #include "ExecState.h" #include "JSActivation.h" #include "JSLock.h" #include "JSPropertyNameIterator.h" #include "Parser.h" #include "Profiler.h" #include "Register.h" #include "ArrayPrototype.h" #include "debugger.h" #include "JSFunction.h" #include "JSString.h" #include "object_object.h" #include "operations.h" #include "operations.h" #include "RegExpObject.h" namespace KJS { #if HAVE(COMPUTED_GOTO) static void* op_throw_end_indirect; static void* op_call_indirect; #endif // Retrieves the offset of a calling function within the current register file. bool getCallerFunctionOffset(Register** registerBase, int callOffset, int& callerOffset) { Register* callFrame = (*registerBase) + callOffset; CodeBlock* callerCodeBlock = callFrame[Machine::CallerCodeBlock].u.codeBlock; if (!callerCodeBlock) // test for top frame of re-entrant function call return false; if (callerCodeBlock->codeType == EvalCode) return false; callerOffset = callFrame[Machine::CallerRegisterOffset].u.i - callerCodeBlock->numLocals - Machine::CallFrameHeaderSize; if (callerOffset < 0) // test for global frame return false; return true; } // Returns the depth of the scope chain within a given call frame. static int depth(ScopeChain& sc) { int scopeDepth = 0; ScopeChainIterator iter = sc.begin(); ScopeChainIterator end = sc.end(); while (!(*iter)->isVariableObject()) { ++iter; ++scopeDepth; } return scopeDepth; } static inline bool jsLess(ExecState* exec, JSValue* v1, JSValue* v2) { if (JSImmediate::areBothImmediateNumbers(v1, v2)) return JSImmediate::getTruncatedInt32(v1) < JSImmediate::getTruncatedInt32(v2); double n1; double n2; JSValue* p1; JSValue* p2; bool wasNotString1 = v1->getPrimitiveNumber(exec, n1, p1); bool wasNotString2 = v2->getPrimitiveNumber(exec, n2, p2); if (wasNotString1 | wasNotString2) return n1 < n2; return static_cast(p1)->value() < static_cast(p2)->value(); } static inline bool jsLessEq(ExecState* exec, JSValue* v1, JSValue* v2) { double n1; double n2; JSValue* p1; JSValue* p2; bool wasNotString1 = v1->getPrimitiveNumber(exec, n1, p1); bool wasNotString2 = v2->getPrimitiveNumber(exec, n2, p2); if (wasNotString1 | wasNotString2) return n1 <= n2; return !(static_cast(p2)->value() < static_cast(p1)->value()); } static JSValue* jsAddSlowCase(ExecState* exec, JSValue* v1, JSValue* v2) { // exception for the Date exception in defaultValue() JSValue* p1 = v1->toPrimitive(exec, UnspecifiedType); JSValue* p2 = v2->toPrimitive(exec, UnspecifiedType); if (p1->isString() || p2->isString()) { UString value = p1->toString(exec) + p2->toString(exec); if (value.isNull()) return throwOutOfMemoryError(exec); return jsString(exec, value); } return jsNumber(exec, p1->toNumber(exec) + p2->toNumber(exec)); } // Fast-path choices here are based on frequency data from SunSpider: // Add case: // --------------------------- // 5626160 Add case: 3 3 (of these, 3637690 are for immediate values) // 247412 Add case: 5 5 // 20900 Add case: 5 6 // 13962 Add case: 5 3 // 4000 Add case: 3 5 static inline JSValue* jsAdd(ExecState* exec, JSValue* v1, JSValue* v2) { JSType t1 = v1->type(); JSType t2 = v2->type(); const unsigned bothTypes = (t1 << 3) | t2; if (bothTypes == ((NumberType << 3) | NumberType)) return jsNumber(exec, v1->uncheckedGetNumber() + v2->uncheckedGetNumber()); if (bothTypes == ((StringType << 3) | StringType)) { UString value = static_cast(v1)->value() + static_cast(v2)->value(); if (value.isNull()) return throwOutOfMemoryError(exec); return jsString(exec, value); } // All other cases are pretty uncommon return jsAddSlowCase(exec, v1, v2); } static JSValue* jsTypeStringForValue(ExecState* exec, JSValue* v) { switch (v->type()) { case UndefinedType: return jsString(exec, "undefined"); case NullType: return jsString(exec, "object"); case BooleanType: return jsString(exec, "boolean"); case NumberType: return jsString(exec, "number"); case StringType: return jsString(exec, "string"); default: if (v->isObject()) { // Return "undefined" for objects that should be treated // as null when doing comparisons. if (static_cast(v)->masqueradeAsUndefined()) return jsString(exec, "undefined"); CallData callData; if (static_cast(v)->getCallData(callData) != CallTypeNone) return jsString(exec, "function"); } return jsString(exec, "object"); } } static bool NEVER_INLINE resolve(ExecState* exec, Instruction* vPC, Register* r, ScopeChainNode* scopeChain, CodeBlock* codeBlock, JSValue*& exceptionValue) { int dst = (vPC + 1)->u.operand; int property = (vPC + 2)->u.operand; ScopeChainIterator iter = scopeChain->begin(); ScopeChainIterator end = scopeChain->end(); ASSERT(iter != end); Identifier& ident = codeBlock->identifiers[property]; do { JSObject* o = *iter; PropertySlot slot(o); if (o->getPropertySlot(exec, ident, slot)) { JSValue* result = slot.getValue(exec, ident); exceptionValue = exec->exception(); if (exceptionValue) return false; r[dst].u.jsValue = result; return true; } } while (++iter != end); exceptionValue = createUndefinedVariableError(exec, ident); return false; } static bool NEVER_INLINE resolve_skip(ExecState* exec, Instruction* vPC, Register* r, ScopeChainNode* scopeChain, CodeBlock* codeBlock, JSValue*& exceptionValue) { int dst = (vPC + 1)->u.operand; int property = (vPC + 2)->u.operand; int skip = (vPC + 3)->u.operand + codeBlock->needsFullScopeChain; ScopeChainIterator iter = scopeChain->begin(); ScopeChainIterator end = scopeChain->end(); ASSERT(iter != end); while (skip--) { ++iter; ASSERT(iter != end); } Identifier& ident = codeBlock->identifiers[property]; do { JSObject* o = *iter; PropertySlot slot(o); if (o->getPropertySlot(exec, ident, slot)) { JSValue* result = slot.getValue(exec, ident); exceptionValue = exec->exception(); if (exceptionValue) return false; r[dst].u.jsValue = result; return true; } } while (++iter != end); exceptionValue = createUndefinedVariableError(exec, ident); return false; } static void NEVER_INLINE resolveBase(ExecState* exec, Instruction* vPC, Register* r, ScopeChainNode* scopeChain, CodeBlock* codeBlock) { int dst = (vPC + 1)->u.operand; int property = (vPC + 2)->u.operand; ScopeChainIterator iter = scopeChain->begin(); ScopeChainIterator next = iter; ++next; ScopeChainIterator end = scopeChain->end(); ASSERT(iter != end); PropertySlot slot; Identifier& ident = codeBlock->identifiers[property]; JSObject* base; while (true) { base = *iter; if (next == end || base->getPropertySlot(exec, ident, slot)) { r[dst].u.jsValue = base; return; } iter = next; ++next; } } static bool NEVER_INLINE resolveBaseAndProperty(ExecState* exec, Instruction* vPC, Register* r, ScopeChainNode* scopeChain, CodeBlock* codeBlock, JSValue*& exceptionValue) { int baseDst = (vPC + 1)->u.operand; int propDst = (vPC + 2)->u.operand; int property = (vPC + 3)->u.operand; ScopeChainIterator iter = scopeChain->begin(); ScopeChainIterator end = scopeChain->end(); // FIXME: add scopeDepthIsZero optimization ASSERT(iter != end); Identifier& ident = codeBlock->identifiers[property]; JSObject* base; do { base = *iter; PropertySlot slot(base); if (base->getPropertySlot(exec, ident, slot)) { JSValue* result = slot.getValue(exec, ident); exceptionValue = exec->exception(); if (exceptionValue) return false; r[propDst].u.jsValue = result; r[baseDst].u.jsValue = base; return true; } ++iter; } while (iter != end); exceptionValue = createUndefinedVariableError(exec, ident); return false; } static bool NEVER_INLINE resolveBaseAndFunc(ExecState* exec, Instruction* vPC, Register* r, ScopeChainNode* scopeChain, CodeBlock* codeBlock, JSValue*& exceptionValue) { int baseDst = (vPC + 1)->u.operand; int funcDst = (vPC + 2)->u.operand; int property = (vPC + 3)->u.operand; ScopeChainIterator iter = scopeChain->begin(); ScopeChainIterator end = scopeChain->end(); // FIXME: add scopeDepthIsZero optimization ASSERT(iter != end); Identifier& ident = codeBlock->identifiers[property]; JSObject* base; do { base = *iter; PropertySlot slot(base); if (base->getPropertySlot(exec, ident, slot)) { // ECMA 11.2.3 says that if we hit an activation the this value should be null. // However, section 10.2.3 says that in the case where the value provided // by the caller is null, the global object should be used. It also says // that the section does not apply to internal functions, but for simplicity // of implementation we use the global object anyway here. This guarantees // that in host objects you always get a valid object for this. // We also handle wrapper substitution for the global object at the same time. JSObject* thisObj = base->toThisObject(exec); JSValue* result = slot.getValue(exec, ident); exceptionValue = exec->exception(); if (exceptionValue) return false; r[baseDst].u.jsValue = thisObj; r[funcDst].u.jsValue = result; return true; } ++iter; } while (iter != end); exceptionValue = createUndefinedVariableError(exec, ident); return false; } ALWAYS_INLINE void initializeCallFrame(Register* callFrame, CodeBlock* codeBlock, Instruction* vPC, ScopeChainNode* scopeChain, int registerOffset, int returnValueRegister, int argv, int argc, int calledAsConstructor, JSValue* function) { callFrame[Machine::CallerCodeBlock].u.codeBlock = codeBlock; callFrame[Machine::ReturnVPC].u.vPC = vPC + 1; callFrame[Machine::CallerScopeChain].u.scopeChain = scopeChain; callFrame[Machine::CallerRegisterOffset].u.i = registerOffset; callFrame[Machine::ReturnValueRegister].u.i = returnValueRegister; callFrame[Machine::ArgumentStartRegister].u.i = argv; // original argument vector (for the sake of the "arguments" object) callFrame[Machine::ArgumentCount].u.i = argc; // original argument count (for the sake of the "arguments" object) callFrame[Machine::CalledAsConstructor].u.i = calledAsConstructor; callFrame[Machine::Callee].u.jsValue = function; callFrame[Machine::OptionalCalleeActivation].u.jsValue = 0; } ALWAYS_INLINE Register* slideRegisterWindowForCall(ExecState* exec, CodeBlock* newCodeBlock, RegisterFile* registerFile, Register** registerBase, int registerOffset, int argv, int argc, JSValue*& exceptionValue) { Register* r = 0; int oldOffset = registerOffset; registerOffset += argv + newCodeBlock->numLocals; size_t size = registerOffset + newCodeBlock->numTemporaries; if (argc == newCodeBlock->numParameters) { // correct number of arguments if (!registerFile->grow(size)) { exceptionValue = createStackOverflowError(exec); return *registerBase + oldOffset; } r = (*registerBase) + registerOffset; } else if (argc < newCodeBlock->numParameters) { // too few arguments -- fill in the blanks if (!registerFile->grow(size)) { exceptionValue = createStackOverflowError(exec); return *registerBase + oldOffset; } r = (*registerBase) + registerOffset; int omittedArgCount = newCodeBlock->numParameters - argc; Register* endOfParams = r - newCodeBlock->numVars; for (Register* it = endOfParams - omittedArgCount; it != endOfParams; ++it) (*it).u.jsValue = jsUndefined(); } else { // too many arguments -- copy return info and expected arguments, leaving the extra arguments behind int shift = argc + Machine::CallFrameHeaderSize; registerOffset += shift; size += shift; if (!registerFile->grow(size)) { exceptionValue = createStackOverflowError(exec); return *registerBase + oldOffset; } r = (*registerBase) + registerOffset; Register* it = r - newCodeBlock->numLocals - Machine::CallFrameHeaderSize - shift; Register* end = it + Machine::CallFrameHeaderSize + newCodeBlock->numParameters; for ( ; it != end; ++it) *(it + shift) = *it; } // initialize local variable slots for (Register* it = r - newCodeBlock->numVars; it != r; ++it) (*it).u.jsValue = jsUndefined(); return r; } ALWAYS_INLINE ScopeChainNode* scopeChainForCall(ExecState* exec, FunctionBodyNode* functionBodyNode, CodeBlock* newCodeBlock, ScopeChainNode* callDataScopeChain, Register** registerBase, Register* r) { if (newCodeBlock->needsFullScopeChain) { JSActivation* activation = new (exec) JSActivation(functionBodyNode, registerBase, r - (*registerBase)); r[Machine::OptionalCalleeActivation - Machine::CallFrameHeaderSize - newCodeBlock->numLocals].u.jsValue = activation; return callDataScopeChain->copy()->push(activation); } return callDataScopeChain; } static NEVER_INLINE bool isNotObject(ExecState* exec, bool forInstanceOf, CodeBlock*, JSValue* value, JSValue*& exceptionData) { if (value->isObject()) return false; exceptionData = createInvalidParamError(exec, forInstanceOf ? "instanceof" : "in" , value); return true; } static NEVER_INLINE JSValue* callEval(ExecState* exec, JSObject* thisObj, ScopeChainNode* scopeChain, RegisterFile* registerFile, Register* r, int argv, int argc, JSValue*& exceptionValue) { if (argc < 2) return jsUndefined(); JSValue* program = r[argv + 1].u.jsValue; if (!program->isString()) return program; Profiler** profiler = Profiler::enabledProfilerReference(); if (*profiler) (*profiler)->willExecute(exec, scopeChain->globalObject()->evalFunction()); int sourceId; int errLine; UString errMsg; RefPtr evalNode = exec->parser()->parse(exec, UString(), 1, UStringSourceProvider::create(static_cast(program)->value()), &sourceId, &errLine, &errMsg); if (!evalNode) { exceptionValue = Error::create(exec, SyntaxError, errMsg, errLine, sourceId, NULL); if (*profiler) (*profiler)->didExecute(exec, scopeChain->globalObject()->evalFunction()); return 0; } JSValue* result = exec->machine()->execute(evalNode.get(), exec, thisObj, registerFile, r - (*registerFile->basePointer()) + argv + argc, scopeChain, &exceptionValue); if (*profiler) (*profiler)->didExecute(exec, scopeChain->globalObject()->evalFunction()); return result; } Machine::Machine() : m_reentryDepth(0) { privateExecute(InitializeAndReturn); } void Machine::dumpCallFrame(const CodeBlock* codeBlock, ScopeChainNode* scopeChain, RegisterFile* registerFile, const Register* r) { ScopeChain sc(scopeChain); JSGlobalObject* globalObject = sc.globalObject(); codeBlock->dump(globalObject->globalExec()); dumpRegisters(codeBlock, registerFile, r); } void Machine::dumpRegisters(const CodeBlock* codeBlock, RegisterFile* registerFile, const Register* r) { printf("Register frame: \n\n"); printf("----------------------------------------\n"); printf(" use | address | value \n"); printf("----------------------------------------\n"); const Register* it; const Register* end; if (isGlobalCallFrame(registerFile->basePointer(), r)) { it = r - registerFile->numGlobalSlots(); end = r; if (it != end) { do { printf("[global var] | %10p | %10p \n", it, (*it).u.jsValue); ++it; } while (it != end); printf("----------------------------------------\n"); } } else { it = r - codeBlock->numLocals - CallFrameHeaderSize; end = it + CallFrameHeaderSize; if (it != end) { do { printf("[call frame] | %10p | %10p \n", it, (*it).u.jsValue); ++it; } while (it != end); printf("----------------------------------------\n"); } end = it + codeBlock->numParameters; if (it != end) { do { printf("[param] | %10p | %10p \n", it, (*it).u.jsValue); ++it; } while (it != end); printf("----------------------------------------\n"); } end = it + codeBlock->numVars; if (it != end) { do { printf("[var] | %10p | %10p \n", it, (*it).u.jsValue); ++it; } while (it != end); printf("----------------------------------------\n"); } } end = it + codeBlock->numTemporaries; if (it != end) { do { printf("[temp] | %10p | %10p \n", it, (*it).u.jsValue); ++it; } while (it != end); } } bool Machine::isOpcode(Opcode opcode) { #if HAVE(COMPUTED_GOTO) return opcode != HashTraits::emptyValue() && !HashTraits::isDeletedValue(opcode) && m_opcodeIDTable.contains(opcode); #else return opcode >= 0 && opcode <= op_end; #endif } NEVER_INLINE bool Machine::unwindCallFrame(ExecState* exec, JSValue* exceptionValue, Register** registerBase, const Instruction*& vPC, CodeBlock*& codeBlock, JSValue**& k, ScopeChainNode*& scopeChain, Register*& r) { CodeBlock* oldCodeBlock = codeBlock; Register* callFrame = r - oldCodeBlock->numLocals - CallFrameHeaderSize; if (Debugger* debugger = exec->dynamicGlobalObject()->debugger()) { DebuggerCallFrame debuggerCallFrame(exec->dynamicGlobalObject(), codeBlock, scopeChain, exceptionValue, registerBase, r - *registerBase); if (!isGlobalCallFrame(registerBase, r) && callFrame[Callee].u.jsObject) // Check for global and eval code debugger->returnEvent(debuggerCallFrame, codeBlock->ownerNode->sourceId(), codeBlock->ownerNode->lastLine()); else debugger->didExecuteProgram(debuggerCallFrame, codeBlock->ownerNode->sourceId(), codeBlock->ownerNode->lastLine()); } if (Profiler* profiler = *Profiler::enabledProfilerReference()) { if (!isGlobalCallFrame(registerBase, r) && callFrame[Callee].u.jsObject) // Check for global and eval code profiler->didExecute(exec, callFrame[Callee].u.jsObject); else profiler->didExecute(exec, codeBlock->ownerNode->sourceURL(), codeBlock->ownerNode->lineNo()); } if (oldCodeBlock->needsFullScopeChain) scopeChain->deref(); if (isGlobalCallFrame(registerBase, r)) return false; // If this call frame created an activation, tear it off. if (JSActivation* activation = static_cast(callFrame[OptionalCalleeActivation].u.jsValue)) { ASSERT(activation->isActivationObject()); activation->copyRegisters(); } codeBlock = callFrame[CallerCodeBlock].u.codeBlock; if (!codeBlock) return false; k = codeBlock->jsValues.data(); scopeChain = callFrame[CallerScopeChain].u.scopeChain; int callerRegisterOffset = callFrame[CallerRegisterOffset].u.i; r = (*registerBase) + callerRegisterOffset; exec->m_callFrameOffset = callerRegisterOffset - codeBlock->numLocals - CallFrameHeaderSize; vPC = callFrame[ReturnVPC].u.vPC; return true; } NEVER_INLINE Instruction* Machine::throwException(ExecState* exec, JSValue* exceptionValue, Register** registerBase, const Instruction* vPC, CodeBlock*& codeBlock, JSValue**& k, ScopeChainNode*& scopeChain, Register*& r) { // Set up the exception object if (exceptionValue->isObject()) { JSObject* exception = static_cast(exceptionValue); if (!exception->hasProperty(exec, Identifier(exec, "line")) && !exception->hasProperty(exec, Identifier(exec, "sourceURL"))) { exception->put(exec, Identifier(exec, "line"), jsNumber(exec, codeBlock->lineNumberForVPC(vPC))); exception->put(exec, Identifier(exec, "sourceURL"), jsOwnedString(exec, codeBlock->ownerNode->sourceURL())); } } if (Debugger* debugger = exec->dynamicGlobalObject()->debugger()) { DebuggerCallFrame debuggerCallFrame(exec->dynamicGlobalObject(), codeBlock, scopeChain, exceptionValue, registerBase, r - *registerBase); debugger->exception(debuggerCallFrame, codeBlock->ownerNode->sourceId(), codeBlock->lineNumberForVPC(vPC)); } // Calculate an exception handler vPC, unwinding call frames as necessary. int scopeDepth; Instruction* handlerVPC; while (!codeBlock->getHandlerForVPC(vPC, handlerVPC, scopeDepth)) { if (!unwindCallFrame(exec, exceptionValue, registerBase, vPC, codeBlock, k, scopeChain, r)) return 0; } // Now unwind the scope chain within the exception handler's call frame. ScopeChain sc(scopeChain); int scopeDelta = depth(sc) - scopeDepth; ASSERT(scopeDelta >= 0); while (scopeDelta--) sc.pop(); setScopeChain(exec, scopeChain, sc.node()); return handlerVPC; } JSValue* Machine::execute(ProgramNode* programNode, ExecState* exec, ScopeChainNode* scopeChain, JSObject* thisObj, RegisterFileStack* registerFileStack, JSValue** exception) { if (m_reentryDepth >= MaxReentryDepth) { *exception = createStackOverflowError(exec); return 0; } RegisterFile* registerFile = registerFileStack->pushGlobalRegisterFile(); ASSERT(registerFile->numGlobalSlots()); CodeBlock* codeBlock = &programNode->code(scopeChain, !registerFileStack->inImplicitCall()); registerFile->addGlobalSlots(codeBlock->numVars); if (!registerFile->grow(codeBlock->numTemporaries)) { registerFileStack->popGlobalRegisterFile(); *exception = createStackOverflowError(exec); return 0; } Register* r = (*registerFile->basePointer()); r[ProgramCodeThisRegister].u.jsValue = thisObj; if (codeBlock->needsFullScopeChain) scopeChain = scopeChain->copy(); ExecState newExec(exec, registerFile, scopeChain, -1); Profiler** profiler = Profiler::enabledProfilerReference(); if (*profiler) (*profiler)->willExecute(exec, programNode->sourceURL(), programNode->lineNo()); m_reentryDepth++; JSValue* result = privateExecute(Normal, &newExec, registerFile, r, scopeChain, codeBlock, exception); m_reentryDepth--; registerFileStack->popGlobalRegisterFile(); if (*profiler) { (*profiler)->didExecute(exec, programNode->sourceURL(), programNode->lineNo()); if (!m_reentryDepth) (*profiler)->didFinishAllExecution(exec); } return result; } JSValue* Machine::execute(FunctionBodyNode* functionBodyNode, ExecState* exec, JSFunction* function, JSObject* thisObj, const ArgList& args, RegisterFileStack* registerFileStack, ScopeChainNode* scopeChain, JSValue** exception) { if (m_reentryDepth >= MaxReentryDepth) { *exception = createStackOverflowError(exec); return 0; } RegisterFile* registerFile = registerFileStack->current(); int argv = CallFrameHeaderSize; int argc = args.size() + 1; // implicit "this" parameter size_t oldSize = registerFile->size(); if (!registerFile->grow(oldSize + CallFrameHeaderSize + argc)) { *exception = createStackOverflowError(exec); return 0; } Register** registerBase = registerFile->basePointer(); int registerOffset = oldSize; int callFrameOffset = registerOffset; Register* callFrame = (*registerBase) + callFrameOffset; // put args in place, including "this" Register* dst = callFrame + CallFrameHeaderSize; (*dst).u.jsValue = thisObj; ArgList::const_iterator end = args.end(); for (ArgList::const_iterator it = args.begin(); it != end; ++it) (*++dst).u.jsValue = *it; // put call frame in place, using a 0 codeBlock to indicate a built-in caller initializeCallFrame(callFrame, 0, 0, 0, registerOffset, 0, argv, argc, 0, function); CodeBlock* newCodeBlock = &functionBodyNode->code(scopeChain); Register* r = slideRegisterWindowForCall(exec, newCodeBlock, registerFile, registerBase, registerOffset, argv, argc, *exception); if (*exception) { registerFile->shrink(oldSize); return 0; } scopeChain = scopeChainForCall(exec, functionBodyNode, newCodeBlock, scopeChain, registerBase, r); ExecState newExec(exec, registerFile, scopeChain, callFrameOffset); Profiler** profiler = Profiler::enabledProfilerReference(); if (*profiler) (*profiler)->willExecute(exec, function); m_reentryDepth++; JSValue* result = privateExecute(Normal, &newExec, registerFile, r, scopeChain, newCodeBlock, exception); m_reentryDepth--; if (*profiler && !m_reentryDepth) (*profiler)->didFinishAllExecution(exec); registerFile->shrink(oldSize); return result; } JSValue* Machine::execute(EvalNode* evalNode, ExecState* exec, JSObject* thisObj, RegisterFile* registerFile, int registerOffset, ScopeChainNode* scopeChain, JSValue** exception) { if (m_reentryDepth >= MaxReentryDepth) { *exception = createStackOverflowError(exec); return 0; } EvalCodeBlock* codeBlock = &evalNode->code(scopeChain); JSVariableObject* variableObject; for (ScopeChainNode* node = scopeChain; ; node = node->next) { ASSERT(node); if (node->object->isVariableObject()) { variableObject = static_cast(node->object); break; } } const Node::VarStack& varStack = codeBlock->ownerNode->varStack(); Node::VarStack::const_iterator varStackEnd = varStack.end(); for (Node::VarStack::const_iterator it = varStack.begin(); it != varStackEnd; ++it) { const Identifier& ident = (*it).first; if (!variableObject->hasProperty(exec, ident)) variableObject->put(exec, ident, jsUndefined()); } const Node::FunctionStack& functionStack = codeBlock->ownerNode->functionStack(); Node::FunctionStack::const_iterator functionStackEnd = functionStack.end(); for (Node::FunctionStack::const_iterator it = functionStack.begin(); it != functionStackEnd; ++it) variableObject->put(exec, (*it)->m_ident, (*it)->makeFunction(exec, scopeChain)); size_t oldSize = registerFile->size(); size_t newSize = registerOffset + codeBlock->numVars + codeBlock->numTemporaries + CallFrameHeaderSize; if (!registerFile->grow(newSize)) { *exception = createStackOverflowError(exec); return 0; } Register* callFrame = *registerFile->basePointer() + registerOffset; // put call frame in place, using a 0 codeBlock to indicate a built-in caller initializeCallFrame(callFrame, 0, 0, 0, registerOffset, 0, 0, 0, 0, 0); Register* r = callFrame + CallFrameHeaderSize + codeBlock->numVars; r[ProgramCodeThisRegister].u.jsValue = thisObj; if (codeBlock->needsFullScopeChain) scopeChain = scopeChain->copy(); ExecState newExec(exec, registerFile, scopeChain, -1); Profiler** profiler = Profiler::enabledProfilerReference(); if (*profiler) (*profiler)->willExecute(exec, evalNode->sourceURL(), evalNode->lineNo()); m_reentryDepth++; JSValue* result = privateExecute(Normal, &newExec, registerFile, r, scopeChain, codeBlock, exception); m_reentryDepth--; registerFile->shrink(oldSize); if (*profiler) { (*profiler)->didExecute(exec, evalNode->sourceURL(), evalNode->lineNo()); if (!m_reentryDepth) (*profiler)->didFinishAllExecution(exec); } return result; } JSValue* Machine::execute(EvalNode* evalNode, ExecState* exec, JSObject* thisObj, RegisterFileStack* registerFileStack, ScopeChainNode* scopeChain, JSValue** exception) { RegisterFile* registerFile = registerFileStack->current(); if (registerFile->safeForReentry()) return Machine::execute(evalNode, exec, thisObj, registerFile, registerFile->size(), scopeChain, exception); registerFile = registerFileStack->pushFunctionRegisterFile(); JSValue* result = Machine::execute(evalNode, exec, thisObj, registerFile, registerFile->size(), scopeChain, exception); registerFileStack->popFunctionRegisterFile(); return result; } ALWAYS_INLINE void Machine::setScopeChain(ExecState* exec, ScopeChainNode*& scopeChain, ScopeChainNode* newScopeChain) { scopeChain = newScopeChain; exec->m_scopeChain = newScopeChain; } NEVER_INLINE void Machine::debug(ExecState* exec, const Instruction* vPC, const CodeBlock* codeBlock, ScopeChainNode* scopeChain, Register** registerBase, Register* r) { int debugHookID = (++vPC)->u.operand; int firstLine = (++vPC)->u.operand; int lastLine = (++vPC)->u.operand; Debugger* debugger = exec->dynamicGlobalObject()->debugger(); if (!debugger) return; DebuggerCallFrame debuggerCallFrame(exec->dynamicGlobalObject(), codeBlock, scopeChain, 0, registerBase, r - *registerBase); switch((DebugHookID)debugHookID) { case DidEnterCallFrame: { debugger->callEvent(debuggerCallFrame, codeBlock->ownerNode->sourceId(), firstLine); return; } case WillLeaveCallFrame: { debugger->returnEvent(debuggerCallFrame, codeBlock->ownerNode->sourceId(), lastLine); return; } case WillExecuteStatement: { debugger->atStatement(debuggerCallFrame, codeBlock->ownerNode->sourceId(), firstLine); return; } case WillExecuteProgram: { debugger->willExecuteProgram(debuggerCallFrame, codeBlock->ownerNode->sourceId(), firstLine); return; } case DidExecuteProgram: { debugger->didExecuteProgram(debuggerCallFrame, codeBlock->ownerNode->sourceId(), lastLine); return; } case DidReachBreakpoint: { debugger->didReachBreakpoint(debuggerCallFrame, codeBlock->ownerNode->sourceId(), lastLine); return; } } } JSValue* Machine::privateExecute(ExecutionFlag flag, ExecState* exec, RegisterFile* registerFile, Register* r, ScopeChainNode* scopeChain, CodeBlock* codeBlock, JSValue** exception) { // One-time initialization of our address tables. We have to put this code // here because our labels are only in scope inside this function. if (flag == InitializeAndReturn) { #if HAVE(COMPUTED_GOTO) #define ADD_OPCODE(id) m_opcodeTable[id] = &&id; FOR_EACH_OPCODE_ID(ADD_OPCODE); #undef ADD_OPCODE #define ADD_OPCODE_ID(id) m_opcodeIDTable.add(&&id, id); FOR_EACH_OPCODE_ID(ADD_OPCODE_ID); #undef ADD_OPCODE ASSERT(m_opcodeIDTable.size() == numOpcodeIDs); op_throw_end_indirect = &&op_throw_end; op_call_indirect = &&op_call; #endif // HAVE(COMPUTED_GOTO) return 0; } JSValue* exceptionValue = 0; Instruction* handlerVPC = 0; Register** registerBase = registerFile->basePointer(); Instruction* vPC = codeBlock->instructions.begin(); JSValue** k = codeBlock->jsValues.data(); Profiler** enabledProfilerReference = Profiler::enabledProfilerReference(); registerFile->setSafeForReentry(false); #define VM_CHECK_EXCEPTION() \ do { \ if (UNLIKELY(exec->hadException())) { \ exceptionValue = exec->exception(); \ goto vm_throw; \ } \ } while (0) #if DUMP_OPCODE_STATS OpcodeStats::resetLastInstruction(); #endif #if HAVE(COMPUTED_GOTO) #define NEXT_OPCODE goto *vPC->u.opcode #if DUMP_OPCODE_STATS #define BEGIN_OPCODE(opcode) opcode: OpcodeStats::recordInstruction(opcode); #else #define BEGIN_OPCODE(opcode) opcode: #endif NEXT_OPCODE; #else #define NEXT_OPCODE continue #if DUMP_OPCODE_STATS #define BEGIN_OPCODE(opcode) case opcode: OpcodeStats::recordInstruction(opcode); #else #define BEGIN_OPCODE(opcode) case opcode: #endif while (1) // iterator loop begins switch (vPC->u.opcode) #endif { BEGIN_OPCODE(op_load) { /* load dst(r) src(k) Copies constant src to register dst. */ int dst = (++vPC)->u.operand; int src = (++vPC)->u.operand; r[dst].u.jsValue = k[src]; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_new_object) { /* new_object dst(r) Constructs a new empty Object instance using the original constructor, and puts the result in register dst. */ int dst = (++vPC)->u.operand; r[dst].u.jsValue = constructEmptyObject(exec); ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_new_array) { /* new_array dst(r) Constructs a new empty Array instance using the original constructor, and puts the result in register dst. */ int dst = (++vPC)->u.operand; r[dst].u.jsValue = constructEmptyArray(exec); ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_new_regexp) { /* new_regexp dst(r) regExp(re) Constructs a new RegExp instance using the original constructor from regexp regExp, and puts the result in register dst. */ int dst = (++vPC)->u.operand; int regExp = (++vPC)->u.operand; r[dst].u.jsValue = new (exec) RegExpObject(scopeChain->globalObject()->regExpPrototype(), codeBlock->regexps[regExp]); ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_mov) { /* mov dst(r) src(r) Copies register src to register dst. */ int dst = (++vPC)->u.operand; int src = (++vPC)->u.operand; r[dst] = r[src]; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_eq) { /* eq dst(r) src1(r) src2(r) Checks whether register src1 and register src2 are equal, as with the ECMAScript '==' operator, and puts the result as a boolean in register dst. */ JSValue*& dst = r[(++vPC)->u.operand].u.jsValue; JSValue* src1 = r[(++vPC)->u.operand].u.jsValue; JSValue* src2 = r[(++vPC)->u.operand].u.jsValue; JSValue* result; if (JSImmediate::areBothImmediateNumbers(src1, src2)) result = jsBoolean(reinterpret_cast(src1) == reinterpret_cast(src2)); else { result = jsBoolean(equal(exec, src1, src2)); VM_CHECK_EXCEPTION(); } dst = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_neq) { /* neq dst(r) src1(r) src2(r) Checks whether register src1 and register src2 are not equal, as with the ECMAScript '!=' operator, and puts the result as a boolean in register dst. */ JSValue*& dst = r[(++vPC)->u.operand].u.jsValue; JSValue* src1 = r[(++vPC)->u.operand].u.jsValue; JSValue* src2 = r[(++vPC)->u.operand].u.jsValue; JSValue* result; if (JSImmediate::areBothImmediateNumbers(src1, src2)) result = jsBoolean(reinterpret_cast(src1) != reinterpret_cast(src2)); else { result = jsBoolean(!equal(exec, src1, src2)); VM_CHECK_EXCEPTION(); } dst = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_stricteq) { /* stricteq dst(r) src1(r) src2(r) Checks whether register src1 and register src2 are strictly equal, as with the ECMAScript '===' operator, and puts the result as a boolean in register dst. */ JSValue*& dst = r[(++vPC)->u.operand].u.jsValue; JSValue* src1 = r[(++vPC)->u.operand].u.jsValue; JSValue* src2 = r[(++vPC)->u.operand].u.jsValue; if (JSImmediate::areBothImmediateNumbers(src1, src2)) dst = jsBoolean(reinterpret_cast(src1) == reinterpret_cast(src2)); else dst = jsBoolean(strictEqual(src1, src2)); ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_nstricteq) { /* nstricteq dst(r) src1(r) src2(r) Checks whether register src1 and register src2 are not strictly equal, as with the ECMAScript '!==' operator, and puts the result as a boolean in register dst. */ JSValue*& dst = r[(++vPC)->u.operand].u.jsValue; JSValue* src1 = r[(++vPC)->u.operand].u.jsValue; JSValue* src2 = r[(++vPC)->u.operand].u.jsValue; if (JSImmediate::areBothImmediateNumbers(src1, src2)) dst = jsBoolean(reinterpret_cast(src1) != reinterpret_cast(src2)); else dst = jsBoolean(!strictEqual(src1, src2)); ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_less) { /* less dst(r) src1(r) src2(r) Checks whether register src1 is less than register src2, as with the ECMAScript '<' operator, and puts the result as a boolean in register dst. */ JSValue*& dst = r[(++vPC)->u.operand].u.jsValue; JSValue* src1 = r[(++vPC)->u.operand].u.jsValue; JSValue* src2 = r[(++vPC)->u.operand].u.jsValue; JSValue* result = jsBoolean(jsLess(exec, src1, src2)); VM_CHECK_EXCEPTION(); dst = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_lesseq) { /* lesseq dst(r) src1(r) src2(r) Checks whether register src1 is less than or equal to register src2, as with the ECMAScript '<=' operator, and puts the result as a boolean in register dst. */ JSValue*& dst = r[(++vPC)->u.operand].u.jsValue; JSValue* src1 = r[(++vPC)->u.operand].u.jsValue; JSValue* src2 = r[(++vPC)->u.operand].u.jsValue; JSValue* result = jsBoolean(jsLessEq(exec, src1, src2)); VM_CHECK_EXCEPTION(); dst = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_pre_inc) { /* pre_inc srcDst(r) Converts register srcDst to number, adds one, and puts the result back in register srcDst. */ int srcDst = (++vPC)->u.operand; JSValue* v = r[srcDst].u.jsValue; JSValue* result; if (JSImmediate::canDoFastAdditiveOperations(v)) result = JSImmediate::incImmediateNumber(v); else result = jsNumber(exec, v->toNumber(exec) + 1); VM_CHECK_EXCEPTION(); r[srcDst].u.jsValue = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_pre_dec) { /* pre_dec srcDst(r) Converts register srcDst to number, subtracts one, and puts the result back in register srcDst. */ int srcDst = (++vPC)->u.operand; JSValue* v = r[srcDst].u.jsValue; JSValue* result; if (JSImmediate::canDoFastAdditiveOperations(v)) result = JSImmediate::decImmediateNumber(v); else result = jsNumber(exec, v->toNumber(exec) - 1); VM_CHECK_EXCEPTION(); r[srcDst].u.jsValue = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_post_inc) { /* post_inc dst(r) srcDst(r) Converts register srcDst to number. The number itself is written to register dst, and the number plus one is written back to register srcDst. */ int dst = (++vPC)->u.operand; int srcDst = (++vPC)->u.operand; JSValue* v = r[srcDst].u.jsValue; JSValue* result; JSValue* number; if (JSImmediate::canDoFastAdditiveOperations(v)) { number = v; result = JSImmediate::incImmediateNumber(v); } else { number = r[srcDst].u.jsValue->toJSNumber(exec); result = jsNumber(exec, number->uncheckedGetNumber() + 1); } VM_CHECK_EXCEPTION(); r[dst].u.jsValue = number; r[srcDst].u.jsValue = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_post_dec) { /* post_dec dst(r) srcDst(r) Converts register srcDst to number. The number itself is written to register dst, and the number minus one is written back to register srcDst. */ int dst = (++vPC)->u.operand; int srcDst = (++vPC)->u.operand; JSValue* v = r[srcDst].u.jsValue; JSValue* result; JSValue* number; if (JSImmediate::canDoFastAdditiveOperations(v)) { number = v; result = JSImmediate::decImmediateNumber(v); } else { number = r[srcDst].u.jsValue->toJSNumber(exec); result = jsNumber(exec, number->uncheckedGetNumber() - 1); } VM_CHECK_EXCEPTION(); r[dst].u.jsValue = number; r[srcDst].u.jsValue = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_to_jsnumber) { /* to_jsnumber dst(r) src(r) Converts register src to number, and puts the result in register dst. */ int dst = (++vPC)->u.operand; int src = (++vPC)->u.operand; JSValue* result = r[src].u.jsValue->toJSNumber(exec); VM_CHECK_EXCEPTION(); r[dst].u.jsValue = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_negate) { /* negate dst(r) src(r) Converts register src to number, negates it, and puts the result in register dst. */ int dst = (++vPC)->u.operand; int src = (++vPC)->u.operand; JSValue* result = jsNumber(exec, -r[src].u.jsValue->toNumber(exec)); VM_CHECK_EXCEPTION(); r[dst].u.jsValue = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_add) { /* add dst(r) src1(r) src2(r) Adds register src1 and register src2, and puts the result in register dst. (JS add may be string concatenation or numeric add, depending on the types of the operands.) */ JSValue*& dst = r[(++vPC)->u.operand].u.jsValue; JSValue* src1 = r[(++vPC)->u.operand].u.jsValue; JSValue* src2 = r[(++vPC)->u.operand].u.jsValue; JSValue* result; if (JSImmediate::canDoFastAdditiveOperations(src1) && JSImmediate::canDoFastAdditiveOperations(src2)) result = JSImmediate::addImmediateNumbers(src1, src2); else { result = jsAdd(exec, src1, src2); VM_CHECK_EXCEPTION(); } dst = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_mul) { /* mul dst(r) src1(r) src2(r) Multiplies register src1 and register src2 (converted to numbers), and puts the product in register dst. */ JSValue*& dst = r[(++vPC)->u.operand].u.jsValue; JSValue* src1 = r[(++vPC)->u.operand].u.jsValue; JSValue* src2 = r[(++vPC)->u.operand].u.jsValue; JSValue* result = jsNumber(exec, src1->toNumber(exec) * src2->toNumber(exec)); VM_CHECK_EXCEPTION(); dst = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_div) { /* div dst(r) dividend(r) divisor(r) Divides register dividend (converted to number) by the register divisor (converted to number), and puts the quotient in register dst. */ int dst = (++vPC)->u.operand; int dividend = (++vPC)->u.operand; int divisor = (++vPC)->u.operand; JSValue* result = jsNumber(exec, r[dividend].u.jsValue->toNumber(exec) / r[divisor].u.jsValue->toNumber(exec)); VM_CHECK_EXCEPTION(); r[dst].u.jsValue = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_mod) { /* mod dst(r) dividend(r) divisor(r) Divides register dividend (converted to number) by register divisor (converted to number), and puts the remainder in register dst. */ int dst = (++vPC)->u.operand; int dividend = (++vPC)->u.operand; int divisor = (++vPC)->u.operand; double d = r[dividend].u.jsValue->toNumber(exec); JSValue* result = jsNumber(exec, fmod(d, r[divisor].u.jsValue->toNumber(exec))); VM_CHECK_EXCEPTION(); r[dst].u.jsValue = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_sub) { /* sub dst(r) src1(r) src2(r) Subtracts register src2 (converted to number) from register src1 (converted to number), and puts the difference in register dst. */ JSValue*& dst = r[(++vPC)->u.operand].u.jsValue; JSValue* src1 = r[(++vPC)->u.operand].u.jsValue; JSValue* src2 = r[(++vPC)->u.operand].u.jsValue; JSValue* result; if (JSImmediate::canDoFastAdditiveOperations(src1) && JSImmediate::canDoFastAdditiveOperations(src2)) result = JSImmediate::subImmediateNumbers(src1, src2); else { result = jsNumber(exec, src1->toNumber(exec) - src2->toNumber(exec)); VM_CHECK_EXCEPTION(); } dst = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_lshift) { /* lshift dst(r) val(r) shift(r) Performs left shift of register val (converted to int32) by register shift (converted to uint32), and puts the result in register dst. */ JSValue*& dst = r[(++vPC)->u.operand].u.jsValue; JSValue* val = r[(++vPC)->u.operand].u.jsValue; JSValue* shift = r[(++vPC)->u.operand].u.jsValue; JSValue* result; if (JSImmediate::areBothImmediateNumbers(val, shift)) result = jsNumber(exec, JSImmediate::getTruncatedInt32(val) << (JSImmediate::toTruncatedUInt32(shift) & 0x1f)); else { result = jsNumber(exec, (val->toInt32(exec)) << (shift->toUInt32(exec) & 0x1f)); VM_CHECK_EXCEPTION(); } dst = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_rshift) { /* rshift dst(r) val(r) shift(r) Performs arithmetic right shift of register val (converted to int32) by register shift (converted to uint32), and puts the result in register dst. */ JSValue*& dst = r[(++vPC)->u.operand].u.jsValue; JSValue* val = r[(++vPC)->u.operand].u.jsValue; JSValue* shift = r[(++vPC)->u.operand].u.jsValue; JSValue* result; if (JSImmediate::areBothImmediateNumbers(val, shift)) result = JSImmediate::rightShiftImmediateNumbers(val, shift); else { result = jsNumber(exec, (val->toInt32(exec)) >> (shift->toUInt32(exec) & 0x1f)); VM_CHECK_EXCEPTION(); } dst = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_urshift) { /* rshift dst(r) val(r) shift(r) Performs logical right shift of register val (converted to uint32) by register shift (converted to uint32), and puts the result in register dst. */ JSValue*& dst = r[(++vPC)->u.operand].u.jsValue; JSValue* val = r[(++vPC)->u.operand].u.jsValue; JSValue* shift = r[(++vPC)->u.operand].u.jsValue; JSValue* result; if (JSImmediate::areBothImmediateNumbers(val, shift) && !JSImmediate::isNegative(val)) result = JSImmediate::rightShiftImmediateNumbers(val, shift); else { result = jsNumber(exec, (val->toUInt32(exec)) >> (shift->toUInt32(exec) & 0x1f)); VM_CHECK_EXCEPTION(); } dst = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_bitand) { /* bitand dst(r) src1(r) src2(r) Computes bitwise AND of register src1 (converted to int32) and register src2 (converted to int32), and puts the result in register dst. */ JSValue*& dst = r[(++vPC)->u.operand].u.jsValue; JSValue* src1 = r[(++vPC)->u.operand].u.jsValue; JSValue* src2 = r[(++vPC)->u.operand].u.jsValue; JSValue* result; if (JSImmediate::areBothImmediateNumbers(src1, src2)) result = JSImmediate::andImmediateNumbers(src1, src2); else { result = jsNumber(exec, src1->toInt32(exec) & src2->toInt32(exec)); VM_CHECK_EXCEPTION(); } dst = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_bitxor) { /* bitxor dst(r) src1(r) src2(r) Computes bitwise XOR of register src1 (converted to int32) and register src2 (converted to int32), and puts the result in register dst. */ JSValue*& dst = r[(++vPC)->u.operand].u.jsValue; JSValue* src1 = r[(++vPC)->u.operand].u.jsValue; JSValue* src2 = r[(++vPC)->u.operand].u.jsValue; JSValue* result; if (JSImmediate::areBothImmediateNumbers(src1, src2)) result = JSImmediate::xorImmediateNumbers(src1, src2); else { result = jsNumber(exec, src1->toInt32(exec) ^ src2->toInt32(exec)); VM_CHECK_EXCEPTION(); } dst = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_bitor) { /* bitor dst(r) src1(r) src2(r) Computes bitwise OR of register src1 (converted to int32) and register src2 (converted to int32), and puts the result in register dst. */ JSValue*& dst = r[(++vPC)->u.operand].u.jsValue; JSValue* src1 = r[(++vPC)->u.operand].u.jsValue; JSValue* src2 = r[(++vPC)->u.operand].u.jsValue; JSValue* result; if (JSImmediate::areBothImmediateNumbers(src1, src2)) result = JSImmediate::orImmediateNumbers(src1, src2); else { result = jsNumber(exec, src1->toInt32(exec) | src2->toInt32(exec)); VM_CHECK_EXCEPTION(); } dst = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_bitnot) { /* bitnot dst(r) src(r) Computes bitwise NOT of register src1 (converted to int32), and puts the result in register dst. */ int dst = (++vPC)->u.operand; int src = (++vPC)->u.operand; JSValue* result = jsNumber(exec, ~r[src].u.jsValue->toInt32(exec)); VM_CHECK_EXCEPTION(); r[dst].u.jsValue = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_not) { /* not dst(r) src1(r) src2(r) Computes logical NOT of register src1 (converted to boolean), and puts the result in register dst. */ int dst = (++vPC)->u.operand; int src = (++vPC)->u.operand; JSValue* result = jsBoolean(!r[src].u.jsValue->toBoolean(exec)); VM_CHECK_EXCEPTION(); r[dst].u.jsValue = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_instanceof) { /* instanceof dst(r) value(r) constructor(r) Tests whether register value is an instance of register constructor, and puts the boolean result in register dst. Raises an exception if register constructor is not an object. */ int dst = (++vPC)->u.operand; int value = (++vPC)->u.operand; int base = (++vPC)->u.operand; JSValue* baseVal = r[base].u.jsValue; if (isNotObject(exec, vPC, codeBlock, baseVal, exceptionValue)) goto vm_throw; JSObject* baseObj = static_cast(baseVal); r[dst].u.jsValue = jsBoolean(baseObj->implementsHasInstance() ? baseObj->hasInstance(exec, r[value].u.jsValue) : false); ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_typeof) { /* typeof dst(r) src(r) Determines the type string for src according to ECMAScript rules, and puts the result in register dst. */ int dst = (++vPC)->u.operand; int src = (++vPC)->u.operand; r[dst].u.jsValue = jsTypeStringForValue(exec, r[src].u.jsValue); ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_in) { /* in dst(r) property(r) base(r) Tests whether register base has a property named register property, and puts the boolean result in register dst. Raises an exception if register constructor is not an object. */ int dst = (++vPC)->u.operand; int property = (++vPC)->u.operand; int base = (++vPC)->u.operand; JSValue* baseVal = r[base].u.jsValue; if (isNotObject(exec, vPC, codeBlock, baseVal, exceptionValue)) goto vm_throw; JSObject* baseObj = static_cast(baseVal); JSValue* propName = r[property].u.jsValue; uint32_t i; if (propName->getUInt32(i)) r[dst].u.jsValue = jsBoolean(baseObj->hasProperty(exec, i)); else { Identifier property(exec, propName->toString(exec)); VM_CHECK_EXCEPTION(); r[dst].u.jsValue = jsBoolean(baseObj->hasProperty(exec, property)); } ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_resolve) { /* resolve dst(r) property(id) Looks up the property named by identifier property in the scope chain, and writes the resulting value to register dst. If the property is not found, raises an exception. */ if (UNLIKELY(!resolve(exec, vPC, r, scopeChain, codeBlock, exceptionValue))) goto vm_throw; vPC += 3; NEXT_OPCODE; } BEGIN_OPCODE(op_resolve_skip) { /* resolve_skip dst(r) property(id) skip(n) Looks up the property named by identifier property in the scope chain skipping the top 'skip' levels, and writes the resulting value to register dst. If the property is not found, raises an exception. */ if (UNLIKELY(!resolve_skip(exec, vPC, r, scopeChain, codeBlock, exceptionValue))) goto vm_throw; vPC += 4; NEXT_OPCODE; } BEGIN_OPCODE(op_get_scoped_var) { /* get_scoped_var dst(r) index(n) skip(n) Loads the contents of the index-th local from the scope skip nodes from the top of the scope chain, and places it in register dst */ int dst = (++vPC)->u.operand; int index = (++vPC)->u.operand; int skip = (++vPC)->u.operand + codeBlock->needsFullScopeChain; ScopeChainIterator iter = scopeChain->begin(); ScopeChainIterator end = scopeChain->end(); ASSERT(iter != end); while (skip--) { ++iter; ASSERT(iter != end); } ASSERT((*iter)->isVariableObject()); JSVariableObject* scope = static_cast(*iter); r[dst].u.jsValue = scope->valueAt(index); ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_put_scoped_var) { /* put_scoped_var index(n) skip(n) value(r) */ int index = (++vPC)->u.operand; int skip = (++vPC)->u.operand + codeBlock->needsFullScopeChain; int value = (++vPC)->u.operand; ScopeChainIterator iter = scopeChain->begin(); ScopeChainIterator end = scopeChain->end(); ASSERT(iter != end); while (skip--) { ++iter; ASSERT(iter != end); } ASSERT((*iter)->isVariableObject()); JSVariableObject* scope = static_cast(*iter); scope->valueAt(index) = r[value].u.jsValue; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_resolve_base) { /* resolve_base dst(r) property(id) Searches the scope chain for an object containing identifier property, and if one is found, writes it to register dst. If none is found, the outermost scope (which will be the global object) is stored in register dst. */ resolveBase(exec, vPC, r, scopeChain, codeBlock); vPC += 3; NEXT_OPCODE; } BEGIN_OPCODE(op_resolve_with_base) { /* resolve_with_base baseDst(r) propDst(r) property(id) Searches the scope chain for an object containing identifier property, and if one is found, writes it to register srcDst, and the retrieved property value to register propDst. If the property is not found, raises an exception. This is more efficient than doing resolve_base followed by resolve, or resolve_base followed by get_by_id, as it avoids duplicate hash lookups. */ if (UNLIKELY(!resolveBaseAndProperty(exec, vPC, r, scopeChain, codeBlock, exceptionValue))) goto vm_throw; vPC += 4; NEXT_OPCODE; } BEGIN_OPCODE(op_resolve_func) { /* resolve_func baseDst(r) funcDst(r) property(id) Searches the scope chain for an object containing identifier property, and if one is found, writes the appropriate object to use as "this" when calling its properties to register baseDst; and the retrieved property value to register propDst. If the property is not found, raises an exception. This differs from resolve_with_base, because the global this value will be substituted for activations or the global object, which is the right behavior for function calls but not for other property lookup. */ if (UNLIKELY(!resolveBaseAndFunc(exec, vPC, r, scopeChain, codeBlock, exceptionValue))) goto vm_throw; vPC += 4; NEXT_OPCODE; } BEGIN_OPCODE(op_get_by_id) { /* get_by_id dst(r) base(r) property(id) Converts register base to Object, gets the property named by identifier property from the object, and puts the result in register dst. */ int dst = (++vPC)->u.operand; int base = (++vPC)->u.operand; int property = (++vPC)->u.operand; #ifndef NDEBUG int registerOffset = r - (*registerBase); #endif Identifier& ident = codeBlock->identifiers[property]; JSValue *result = r[base].u.jsValue->get(exec, ident); ASSERT(registerOffset == (r - (*registerBase))); VM_CHECK_EXCEPTION(); r[dst].u.jsValue = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_put_by_id) { /* put_by_id base(r) property(id) value(r) Sets register value on register base as the property named by identifier property. Base is converted to object first. Unlike many opcodes, this one does not write any output to the register file. */ int base = (++vPC)->u.operand; int property = (++vPC)->u.operand; int value = (++vPC)->u.operand; #ifndef NDEBUG int registerOffset = r - (*registerBase); #endif Identifier& ident = codeBlock->identifiers[property]; r[base].u.jsValue->put(exec, ident, r[value].u.jsValue); ASSERT(registerOffset == (r - (*registerBase))); VM_CHECK_EXCEPTION(); ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_del_by_id) { /* del_by_id dst(r) base(r) property(id) Converts register base to Object, deletes the property named by identifier property from the object, and writes a boolean indicating success (if true) or failure (if false) to register dst. */ int dst = (++vPC)->u.operand; int base = (++vPC)->u.operand; int property = (++vPC)->u.operand; JSObject* baseObj = r[base].u.jsValue->toObject(exec); Identifier& ident = codeBlock->identifiers[property]; JSValue* result = jsBoolean(baseObj->deleteProperty(exec, ident)); VM_CHECK_EXCEPTION(); r[dst].u.jsValue = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_get_by_val) { /* get_by_val dst(r) base(r) property(r) Converts register base to Object, gets the property named by register property from the object, and puts the result in register dst. property is nominally converted to string but numbers are treated more efficiently. */ int dst = (++vPC)->u.operand; int base = (++vPC)->u.operand; int property = (++vPC)->u.operand; JSValue* baseValue = r[base].u.jsValue; JSValue* subscript = r[property].u.jsValue; JSValue* result; uint32_t i; if (subscript->getUInt32(i)) result = baseValue->get(exec, i); else { JSObject* baseObj = baseValue->toObject(exec); // may throw Identifier property; if (subscript->isObject()) { VM_CHECK_EXCEPTION(); // If toObject threw, we must not call toString, which may execute arbitrary code property = Identifier(exec, subscript->toString(exec)); } else property = Identifier(exec, subscript->toString(exec)); VM_CHECK_EXCEPTION(); // This check is needed to prevent us from incorrectly calling a getter after an exception is thrown result = baseObj->get(exec, property); } VM_CHECK_EXCEPTION(); r[dst].u.jsValue = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_put_by_val) { /* put_by_val base(r) property(r) value(r) Sets register value on register base as the property named by register property. Base is converted to object first. register property is nominally converted to string but numbers are treated more efficiently. Unlike many opcodes, this one does not write any output to the register file. */ int base = (++vPC)->u.operand; int property = (++vPC)->u.operand; int value = (++vPC)->u.operand; JSValue* baseValue = r[base].u.jsValue; JSValue* subscript = r[property].u.jsValue; uint32_t i; if (subscript->getUInt32(i)) baseValue->put(exec, i, r[value].u.jsValue); else { JSObject* baseObj = baseValue->toObject(exec); Identifier property; if (subscript->isObject()) { VM_CHECK_EXCEPTION(); // If toObject threw, we must not call toString, which may execute arbitrary code property = Identifier(exec, subscript->toString(exec)); } else property = Identifier(exec, subscript->toString(exec)); VM_CHECK_EXCEPTION(); // This check is needed to prevent us from incorrectly calling a setter after an exception is thrown baseObj->put(exec, property, r[value].u.jsValue); } VM_CHECK_EXCEPTION(); ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_del_by_val) { /* del_by_val dst(r) base(r) property(r) Converts register base to Object, deletes the property named by register property from the object, and writes a boolean indicating success (if true) or failure (if false) to register dst. */ int dst = (++vPC)->u.operand; int base = (++vPC)->u.operand; int property = (++vPC)->u.operand; JSObject* baseObj = r[base].u.jsValue->toObject(exec); // may throw JSValue* subscript = r[property].u.jsValue; JSValue* result; uint32_t i; if (subscript->getUInt32(i)) result = jsBoolean(baseObj->deleteProperty(exec, i)); else { VM_CHECK_EXCEPTION(); // If toObject threw, we must not call toString, which may execute arbitrary code Identifier property(exec, subscript->toString(exec)); VM_CHECK_EXCEPTION(); result = jsBoolean(baseObj->deleteProperty(exec, property)); } VM_CHECK_EXCEPTION(); r[dst].u.jsValue = result; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_put_by_index) { /* put_by_index base(r) property(n) value(r) Sets register value on register base as the property named by the immediate number property. Base is converted to object first. register property is nominally converted to string but numbers are treated more efficiently. Unlike many opcodes, this one does not write any output to the register file. This opcode is mainly used to initialize array literals. */ int base = (++vPC)->u.operand; unsigned property = (++vPC)->u.operand; int value = (++vPC)->u.operand; r[base].u.jsObject->put(exec, property, r[value].u.jsValue); ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_jmp) { /* jmp target(offset) Jumps unconditionally to offset target from the current instruction. */ #if DUMP_OPCODE_STATS OpcodeStats::resetLastInstruction(); #endif int target = (++vPC)->u.operand; vPC += target; NEXT_OPCODE; } BEGIN_OPCODE(op_jtrue) { /* jtrue cond(r) target(offset) Jumps to offset target from the current instruction, if and only if register cond converts to boolean as true. */ int cond = (++vPC)->u.operand; int target = (++vPC)->u.operand; if (r[cond].u.jsValue->toBoolean(exec)) { vPC += target; NEXT_OPCODE; } ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_jfalse) { /* jfalse cond(r) target(offset) Jumps to offset target from the current instruction, if and only if register cond converts to boolean as false. */ int cond = (++vPC)->u.operand; int target = (++vPC)->u.operand; if (!r[cond].u.jsValue->toBoolean(exec)) { vPC += target; NEXT_OPCODE; } ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_jless) { /* jless src1(r) src2(r) target(offset) Checks whether register src1 is less than register src2, as with the ECMAScript '<' operator, and then jumps to offset target from the current instruction, if and only if the result of the comparison is true. */ JSValue* src1 = r[(++vPC)->u.operand].u.jsValue; JSValue* src2 = r[(++vPC)->u.operand].u.jsValue; int target = (++vPC)->u.operand; bool result = jsLess(exec, src1, src2); VM_CHECK_EXCEPTION(); if (result) { vPC += target; NEXT_OPCODE; } ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_new_func) { /* new_func dst(r) func(f) Constructs a new Function instance from function func and the current scope chain using the original Function constructor, using the rules for function declarations, and puts the result in register dst. */ int dst = (++vPC)->u.operand; int func = (++vPC)->u.operand; r[dst].u.jsValue = codeBlock->functions[func]->makeFunction(exec, scopeChain); ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_new_func_exp) { /* new_func_exp dst(r) func(f) Constructs a new Function instance from function func and the current scope chain using the original Function constructor, using the rules for function expressions, and puts the result in register dst. */ int dst = (++vPC)->u.operand; int func = (++vPC)->u.operand; r[dst].u.jsValue = codeBlock->functionExpressions[func]->makeFunction(exec, scopeChain); ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_call_eval) { /* call_eval dst(r) func(r) thisVal(r) firstArg(r) argCount(n) Call a function named "eval" with no explicit "this" value (which may therefore be the eval operator). If register thisVal is the global object, and register func contains that global object's original global eval function, then perform the eval operator in local scope (interpreting the argument registers as for the "call" opcode). Otherwise, act exacty as the "call" opcode. */ int dst = (++vPC)->u.operand; int func = (++vPC)->u.operand; int thisVal = (++vPC)->u.operand; int firstArg = (++vPC)->u.operand; int argCount = (++vPC)->u.operand; JSValue* funcVal = r[func].u.jsValue; JSValue* baseVal = r[thisVal].u.jsValue; if (baseVal == scopeChain->globalObject() && funcVal == scopeChain->globalObject()->evalFunction()) { int registerOffset = r - (*registerBase); JSObject* thisObject = r[codeBlock->thisRegister].u.jsObject; registerFile->setSafeForReentry(true); JSValue* result = callEval(exec, thisObject, scopeChain, registerFile, r, firstArg, argCount, exceptionValue); registerFile->setSafeForReentry(false); r = (*registerBase) + registerOffset; if (exceptionValue) goto vm_throw; r[dst].u.jsValue = result; ++vPC; NEXT_OPCODE; } // We didn't find the blessed version of eval, so reset vPC and process // this instruction as a normal function call, supplying the proper 'this' // value. vPC -= 5; r[thisVal].u.jsValue = baseVal->toThisObject(exec); #if HAVE(COMPUTED_GOTO) // Hack around gcc performance quirk by performing an indirect goto // in order to set the vPC -- attempting to do so directly results in a // significant regression. goto *op_call_indirect; // indirect goto -> op_call #endif // fall through to op_call } BEGIN_OPCODE(op_call) { /* call dst(r) func(r) thisVal(r) firstArg(r) argCount(n) Perform a function call. Specifically, call register func with a "this" value of register thisVal, and put the result in register dst. The arguments start at register firstArg and go up to argCount, but the "this" value is considered an implicit first argument, so the argCount should be one greater than the number of explicit arguments passed, and the register after firstArg should contain the actual first argument. This opcode will copy from the thisVal register to the firstArg register, unless the register index of thisVal is the special missing this object marker, which is 2^31-1; in that case, the global object will be used as the "this" value. If func is a native code function, then this opcode calls it and returns the value immediately. But if it is a JS function, then the current scope chain and code block is set to the function's, and we slide the register window so that the arguments would form the first few local registers of the called function's register window. In addition, a call frame header is written immediately before the arguments; see the call frame documentation for an explanation of how many registers a call frame takes and what they contain. That many registers before the firstArg register will be overwritten by the call. In addition, any registers higher than firstArg + argCount may be overwritten. Once this setup is complete, execution continues from the called function's first argument, and does not return until a "ret" opcode is encountered. */ int dst = (++vPC)->u.operand; int func = (++vPC)->u.operand; int thisVal = (++vPC)->u.operand; int firstArg = (++vPC)->u.operand; int argCount = (++vPC)->u.operand; JSValue* v = r[func].u.jsValue; CallData callData; CallType callType = v->getCallData(callData); if (callType == CallTypeJS) { if (*enabledProfilerReference) (*enabledProfilerReference)->willExecute(exec, static_cast(v)); int registerOffset = r - (*registerBase); Register* callFrame = r + firstArg - CallFrameHeaderSize; int callFrameOffset = registerOffset + firstArg - CallFrameHeaderSize; r[firstArg].u.jsValue = thisVal == missingThisObjectMarker() ? exec->globalThisValue() : r[thisVal].u.jsValue; initializeCallFrame(callFrame, codeBlock, vPC, scopeChain, registerOffset, dst, firstArg, argCount, 0, v); ScopeChainNode* callDataScopeChain = callData.js.scopeChain; FunctionBodyNode* functionBodyNode = callData.js.functionBody; CodeBlock* newCodeBlock = &functionBodyNode->code(callDataScopeChain); r = slideRegisterWindowForCall(exec, newCodeBlock, registerFile, registerBase, registerOffset, firstArg, argCount, exceptionValue); if (UNLIKELY(exceptionValue != 0)) goto vm_throw; codeBlock = newCodeBlock; exec->m_callFrameOffset = callFrameOffset; setScopeChain(exec, scopeChain, scopeChainForCall(exec, functionBodyNode, codeBlock, callDataScopeChain, registerBase, r)); k = codeBlock->jsValues.data(); vPC = codeBlock->instructions.begin(); #if DUMP_OPCODE_STATS OpcodeStats::resetLastInstruction(); #endif NEXT_OPCODE; } if (callType == CallTypeNative) { if (*enabledProfilerReference) (*enabledProfilerReference)->willExecute(exec, static_cast(v)); int registerOffset = r - (*registerBase); JSValue* thisValue = thisVal == missingThisObjectMarker() ? exec->globalThisValue() : r[thisVal].u.jsValue; ArgList args(reinterpret_cast(registerBase), registerOffset + firstArg + 1, argCount - 1); registerFile->setSafeForReentry(true); JSValue* returnValue = callData.native.function(exec, static_cast(v), thisValue, args); registerFile->setSafeForReentry(false); r = (*registerBase) + registerOffset; r[dst].u.jsValue = returnValue; if (*enabledProfilerReference) (*enabledProfilerReference)->didExecute(exec, static_cast(v)); VM_CHECK_EXCEPTION(); ++vPC; NEXT_OPCODE; } ASSERT(callType == CallTypeNone); exceptionValue = createNotAFunctionError(exec, v, 0); goto vm_throw; } BEGIN_OPCODE(op_ret) { /* ret result(r) Return register result as the return value of the current function call, writing it into the caller's expected return value register. In addition, unwind one call frame and restore the scope chain, code block instruction pointer and register base to those of the calling function. */ int result = (++vPC)->u.operand; CodeBlock* oldCodeBlock = codeBlock; Register* callFrame = r - oldCodeBlock->numLocals - CallFrameHeaderSize; JSValue* returnValue = r[result].u.jsValue; if (JSActivation* activation = static_cast(callFrame[OptionalCalleeActivation].u.jsValue)) { ASSERT(!codeBlock->needsFullScopeChain || scopeChain->object == activation); ASSERT(activation->isActivationObject()); activation->copyRegisters(); } if (*enabledProfilerReference) (*enabledProfilerReference)->didExecute(exec, callFrame[Callee].u.jsObject); if (codeBlock->needsFullScopeChain) scopeChain->deref(); if (callFrame[CalledAsConstructor].u.i && !returnValue->isObject()) { JSValue* thisObject = callFrame[CallFrameHeaderSize].u.jsValue; returnValue = thisObject; } codeBlock = callFrame[CallerCodeBlock].u.codeBlock; if (!codeBlock) return returnValue; k = codeBlock->jsValues.data(); vPC = callFrame[ReturnVPC].u.vPC; setScopeChain(exec, scopeChain, callFrame[CallerScopeChain].u.scopeChain); int callerRegisterOffset = callFrame[CallerRegisterOffset].u.i; r = (*registerBase) + callerRegisterOffset; exec->m_callFrameOffset = callerRegisterOffset - codeBlock->numLocals - CallFrameHeaderSize; int dst = callFrame[ReturnValueRegister].u.i; r[dst].u.jsValue = returnValue; NEXT_OPCODE; } BEGIN_OPCODE(op_construct) { /* construct dst(r) constr(r) firstArg(r) argCount(n) Invoke register "constr" as a constructor. For JS functions, the calling convention is exactly as for the "call" opcode, except that the "this" value is a newly created Object. For native constructors, a null "this" value is passed. In either case, the firstArg and argCount registers are interpreted as for the "call" opcode. */ int dst = (++vPC)->u.operand; int constr = (++vPC)->u.operand; int firstArg = (++vPC)->u.operand; int argCount = (++vPC)->u.operand; JSValue* constrVal = r[constr].u.jsValue; ConstructData constructData; ConstructType constructType = constrVal->getConstructData(constructData); // Removing this line of code causes a measurable regression on squirrelfish. JSObject* constructor = static_cast(constrVal); if (constructType == ConstructTypeJS) { if (*enabledProfilerReference) (*enabledProfilerReference)->willExecute(exec, constructor); int registerOffset = r - (*registerBase); Register* callFrame = r + firstArg - CallFrameHeaderSize; int callFrameOffset = registerOffset + firstArg - CallFrameHeaderSize; JSObject* prototype; JSValue* p = constructor->get(exec, exec->propertyNames().prototype); if (p->isObject()) prototype = static_cast(p); else prototype = scopeChain->globalObject()->objectPrototype(); JSObject* newObject = new (exec) JSObject(prototype); r[firstArg].u.jsValue = newObject; // "this" value initializeCallFrame(callFrame, codeBlock, vPC, scopeChain, registerOffset, dst, firstArg, argCount, 1, constructor); ScopeChainNode* callDataScopeChain = constructData.js.scopeChain; FunctionBodyNode* functionBodyNode = constructData.js.functionBody; CodeBlock* newCodeBlock = &functionBodyNode->code(callDataScopeChain); r = slideRegisterWindowForCall(exec, newCodeBlock, registerFile, registerBase, registerOffset, firstArg, argCount, exceptionValue); if (exceptionValue) goto vm_throw; codeBlock = newCodeBlock; exec->m_callFrameOffset = callFrameOffset; setScopeChain(exec, scopeChain, scopeChainForCall(exec, functionBodyNode, codeBlock, callDataScopeChain, registerBase, r)); k = codeBlock->jsValues.data(); vPC = codeBlock->instructions.begin(); NEXT_OPCODE; } if (constructType == ConstructTypeNative) { if (*enabledProfilerReference) (*enabledProfilerReference)->willExecute(exec, constructor); int registerOffset = r - (*registerBase); ArgList args(reinterpret_cast(registerBase), registerOffset + firstArg + 1, argCount - 1); registerFile->setSafeForReentry(true); JSValue* returnValue = constructData.native.function(exec, constructor, args); registerFile->setSafeForReentry(false); r = (*registerBase) + registerOffset; VM_CHECK_EXCEPTION(); r[dst].u.jsValue = returnValue; if (*enabledProfilerReference) (*enabledProfilerReference)->didExecute(exec, constructor); ++vPC; NEXT_OPCODE; } ASSERT(constructType == ConstructTypeNone); exceptionValue = createNotAConstructorError(exec, constrVal, 0); goto vm_throw; } BEGIN_OPCODE(op_push_scope) { /* push_scope scope(r) Converts register scope to object, and pushes it onto the top of the current scope chain. */ int scope = (++vPC)->u.operand; JSValue* v = r[scope].u.jsValue; JSObject* o = v->toObject(exec); VM_CHECK_EXCEPTION(); setScopeChain(exec, scopeChain, scopeChain->push(o)); ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_pop_scope) { /* pop_scope Removes the top item from the current scope chain. */ setScopeChain(exec, scopeChain, scopeChain->pop()); ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_get_pnames) { /* get_pnames dst(r) base(r) Creates a property name list for register base and puts it in register dst. This is not a true JavaScript value, just a synthetic value used to keep the iteration state in a register. */ int dst = (++vPC)->u.operand; int base = (++vPC)->u.operand; r[dst].u.jsPropertyNameIterator = JSPropertyNameIterator::create(exec, r[base].u.jsValue); ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_next_pname) { /* next_pname dst(r) iter(r) target(offset) Tries to copies the next name from property name list in register iter. If there are names left, then copies one to register dst, and jumps to offset target. If there are none left, invalidates the iterator and continues to the next instruction. */ int dst = (++vPC)->u.operand; int iter = (++vPC)->u.operand; int target = (++vPC)->u.operand; JSPropertyNameIterator* it = r[iter].u.jsPropertyNameIterator; if (JSValue* temp = it->next(exec)) { r[dst].u.jsValue = temp; vPC += target; NEXT_OPCODE; } it->invalidate(); ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_jmp_scopes) { /* jmp_scopes count(n) target(offset) Removes the a number of items from the current scope chain specified by immediate number count, then jumps to offset target. */ int count = (++vPC)->u.operand; int target = (++vPC)->u.operand; ScopeChainNode* tmp = scopeChain; while (count--) tmp = tmp->pop(); setScopeChain(exec, scopeChain, tmp); vPC += target; NEXT_OPCODE; } BEGIN_OPCODE(op_catch) { /* catch ex(r) Retrieves the VMs current exception and puts it in register ex. This is only valid after an exception has been raised, and usually forms the beginning of an exception handler. */ ASSERT(exceptionValue); ASSERT(!exec->hadException()); int ex = (++vPC)->u.operand; r[ex].u.jsValue = exceptionValue; exceptionValue = 0; ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_throw) { /* throw ex(r) Throws register ex as an exception. This involves three steps: first, it is set as the current exception in the VM's internal state, then the stack is unwound until an exception handler or a native code boundary is found, and then control resumes at the exception handler if any or else the script returns control to the nearest native caller. */ int ex = (++vPC)->u.operand; exceptionValue = r[ex].u.jsValue; handlerVPC = throwException(exec, exceptionValue, registerBase, vPC, codeBlock, k, scopeChain, r); if (!handlerVPC) { *exception = exceptionValue; return jsNull(); } #if HAVE(COMPUTED_GOTO) // Hack around gcc performance quirk by performing an indirect goto // in order to set the vPC -- attempting to do so directly results in a // significant regression. goto *op_throw_end_indirect; // indirect goto -> op_throw_end } op_throw_end: { #endif vPC = handlerVPC; NEXT_OPCODE; } BEGIN_OPCODE(op_new_error) { /* new_error dst(r) type(n) message(k) Constructs a new Error instance using the original constructor, using immediate number n as the type and constant message as the message string. The result is written to register dst. */ int dst = (++vPC)->u.operand; int type = (++vPC)->u.operand; int message = (++vPC)->u.operand; r[dst].u.jsValue = Error::create(exec, (ErrorType)type, k[message]->toString(exec), codeBlock->lineNumberForVPC(vPC), codeBlock->ownerNode->sourceId(), codeBlock->ownerNode->sourceURL()); ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_end) { /* end result(r) Return register result as the value of a global or eval program. Return control to the calling native code. */ if (codeBlock->needsFullScopeChain) { ASSERT(scopeChain->refCount > 1); scopeChain->deref(); } int result = (++vPC)->u.operand; return r[result].u.jsValue; } BEGIN_OPCODE(op_put_getter) { /* put_getter base(r) property(id) function(r) Sets register function on register base as the getter named by identifier property. Base and function are assumed to be objects as this op should only be used for getters defined in object literal form. Unlike many opcodes, this one does not write any output to the register file. */ int base = (++vPC)->u.operand; int property = (++vPC)->u.operand; int function = (++vPC)->u.operand; ASSERT(r[base].u.jsValue->isObject()); JSObject* baseObj = static_cast(r[base].u.jsValue); Identifier& ident = codeBlock->identifiers[property]; ASSERT(r[function].u.jsValue->isObject()); baseObj->defineGetter(exec, ident, static_cast(r[function].u.jsValue)); ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_put_setter) { /* put_setter base(r) property(id) function(r) Sets register function on register base as the setter named by identifier property. Base and function are assumed to be objects as this op should only be used for setters defined in object literal form. Unlike many opcodes, this one does not write any output to the register file. */ int base = (++vPC)->u.operand; int property = (++vPC)->u.operand; int function = (++vPC)->u.operand; ASSERT(r[base].u.jsValue->isObject()); JSObject* baseObj = static_cast(r[base].u.jsValue); Identifier& ident = codeBlock->identifiers[property]; ASSERT(r[function].u.jsValue->isObject()); baseObj->defineSetter(exec, ident, static_cast(r[function].u.jsValue)); ++vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_jsr) { /* jsr retAddrDst(r) target(offset) Places the address of the next instruction into the retAddrDst register and jumps to offset target from the current instruction. */ int retAddrDst = (++vPC)->u.operand; int target = (++vPC)->u.operand; r[retAddrDst].u.vPC = vPC + 1; vPC += target; NEXT_OPCODE; } BEGIN_OPCODE(op_sret) { /* sret retAddrSrc(r) Jumps to the address stored in the retAddrSrc register. This differs from op_jmp because the target address is stored in a register, not as an immediate. */ int retAddrSrc = (++vPC)->u.operand; vPC = r[retAddrSrc].u.vPC; NEXT_OPCODE; } BEGIN_OPCODE(op_debug) { /* debug debugHookID(n) firstLine(n) lastLine(n) Notifies the debugger of the current state of execution. This opcode is only generated while the debugger is attached. */ int registerOffset = r - (*registerBase); registerFile->setSafeForReentry(true); debug(exec, vPC, codeBlock, scopeChain, registerBase, r); registerFile->setSafeForReentry(false); r = (*registerBase) + registerOffset; vPC += 4; NEXT_OPCODE; } vm_throw: { exec->clearException(); handlerVPC = throwException(exec, exceptionValue, registerBase, vPC, codeBlock, k, scopeChain, r); if (!handlerVPC) { *exception = exceptionValue; return jsNull(); } vPC = handlerVPC; NEXT_OPCODE; } } #undef NEXT_OPCODE #undef BEGIN_OPCODE #undef VM_CHECK_EXCEPTION } JSValue* Machine::retrieveArguments(ExecState* exec, JSFunction* function) const { Register** registerBase; int callFrameOffset; if (!getCallFrame(exec, function, registerBase, callFrameOffset)) return jsNull(); Register* callFrame = (*registerBase) + callFrameOffset; JSActivation* activation = static_cast(callFrame[OptionalCalleeActivation].u.jsValue); if (!activation) { CodeBlock* codeBlock = &function->body->generatedCode(); activation = new (exec) JSActivation(function->body, registerBase, callFrameOffset + CallFrameHeaderSize + codeBlock->numLocals); callFrame[OptionalCalleeActivation].u.jsValue = activation; } return activation->get(exec, exec->propertyNames().arguments); } JSValue* Machine::retrieveCaller(ExecState* exec, JSFunction* function) const { Register** registerBase; int callFrameOffset; if (!getCallFrame(exec, function, registerBase, callFrameOffset)) return jsNull(); int callerFrameOffset; if (!getCallerFunctionOffset(registerBase, callFrameOffset, callerFrameOffset)) return jsNull(); Register* callerFrame = (*registerBase) + callerFrameOffset; ASSERT(callerFrame[Callee].u.jsValue); return callerFrame[Callee].u.jsValue; } bool Machine::getCallFrame(ExecState* exec, JSFunction* function, Register**& registerBase, int& callFrameOffset) const { callFrameOffset = exec->m_callFrameOffset; while (1) { while (callFrameOffset < 0) { exec = exec->m_prev; if (!exec) return false; callFrameOffset = exec->m_callFrameOffset; } registerBase = exec->m_registerFile->basePointer(); Register* callFrame = (*registerBase) + callFrameOffset; if (callFrame[Callee].u.jsValue == function) return true; if (!getCallerFunctionOffset(registerBase, callFrameOffset, callFrameOffset)) callFrameOffset = -1; } } void Machine::getFunctionAndArguments(Register** registerBase, Register* callFrame, JSFunction*& function, Register*& argv, int& argc) { function = static_cast(callFrame[Callee].u.jsValue); ASSERT(function->inherits(&JSFunction::info)); argv = (*registerBase) + callFrame[CallerRegisterOffset].u.i + callFrame[ArgumentStartRegister].u.i + 1; // skip "this" argc = callFrame[ArgumentCount].u.i - 1; // skip "this" } } // namespace KJS