X-Git-Url: https://git.saurik.com/apple/javascriptcore.git/blobdiff_plain/b80e619319b1def83d1e8b4f84042b661be1be7f..14957cd040308e3eeec43d26bae5d76da13fcd85:/runtime/Executable.cpp

diff --git a/runtime/Executable.cpp b/runtime/Executable.cpp
index 765bd99..5fa560e 100644
--- a/runtime/Executable.cpp
+++ b/runtime/Executable.cpp
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2009 Apple Inc. All rights reserved.
+ * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -30,270 +30,471 @@
 #include "CodeBlock.h"
 #include "JIT.h"
 #include "Parser.h"
-#include "StringBuilder.h"
+#include "UStringBuilder.h"
 #include "Vector.h"
 
+#if ENABLE(DFG_JIT)
+#include "DFGByteCodeParser.h"
+#include "DFGJITCompiler.h"
+#endif
+
 namespace JSC {
 
+const ClassInfo ExecutableBase::s_info = { "Executable", 0, 0, 0 };
+
 #if ENABLE(JIT)
-NativeExecutable::~NativeExecutable()
+class ExecutableFinalizer : public WeakHandleOwner {
+    virtual void finalize(Handle<Unknown> handle, void*)
+    {
+        Weak<ExecutableBase> executable(Weak<ExecutableBase>::Adopt, handle);
+        executable->clearExecutableCode();
+    }
+};
+
+WeakHandleOwner* ExecutableBase::executableFinalizer()
 {
+    DEFINE_STATIC_LOCAL(ExecutableFinalizer, finalizer, ());
+    return &finalizer;
 }
 #endif
+    
+const ClassInfo NativeExecutable::s_info = { "NativeExecutable", &ExecutableBase::s_info, 0, 0 };
 
-VPtrHackExecutable::~VPtrHackExecutable()
+NativeExecutable::~NativeExecutable()
+{
+}
+
+const ClassInfo ScriptExecutable::s_info = { "ScriptExecutable", &ExecutableBase::s_info, 0, 0 };
+
+const ClassInfo EvalExecutable::s_info = { "EvalExecutable", &ScriptExecutable::s_info, 0, 0 };
+
+EvalExecutable::EvalExecutable(ExecState* exec, const SourceCode& source, bool inStrictContext)
+    : ScriptExecutable(exec->globalData().evalExecutableStructure.get(), exec, source, inStrictContext)
 {
 }
 
 EvalExecutable::~EvalExecutable()
 {
-    delete m_evalCodeBlock;
+}
+
+const ClassInfo ProgramExecutable::s_info = { "ProgramExecutable", &ScriptExecutable::s_info, 0, 0 };
+
+ProgramExecutable::ProgramExecutable(ExecState* exec, const SourceCode& source)
+    : ScriptExecutable(exec->globalData().programExecutableStructure.get(), exec, source, false)
+{
 }
 
 ProgramExecutable::~ProgramExecutable()
 {
-    delete m_programCodeBlock;
 }
 
-FunctionExecutable::~FunctionExecutable()
+const ClassInfo FunctionExecutable::s_info = { "FunctionExecutable", &ScriptExecutable::s_info, 0, 0 };
+
+FunctionExecutable::FunctionExecutable(JSGlobalData* globalData, const Identifier& name, const SourceCode& source, bool forceUsesArguments, FunctionParameters* parameters, bool inStrictContext, int firstLine, int lastLine)
+    : ScriptExecutable(globalData->functionExecutableStructure.get(), globalData, source, inStrictContext)
+    , m_numCapturedVariables(0)
+    , m_forceUsesArguments(forceUsesArguments)
+    , m_parameters(parameters)
+    , m_name(name)
+    , m_symbolTable(0)
 {
-    delete m_codeBlock;
+    m_firstLine = firstLine;
+    m_lastLine = lastLine;
 }
 
-JSObject* EvalExecutable::compile(ExecState* exec, ScopeChainNode* scopeChainNode)
+FunctionExecutable::FunctionExecutable(ExecState* exec, const Identifier& name, const SourceCode& source, bool forceUsesArguments, FunctionParameters* parameters, bool inStrictContext, int firstLine, int lastLine)
+    : ScriptExecutable(exec->globalData().functionExecutableStructure.get(), exec, source, inStrictContext)
+    , m_numCapturedVariables(0)
+    , m_forceUsesArguments(forceUsesArguments)
+    , m_parameters(parameters)
+    , m_name(name)
+    , m_symbolTable(0)
 {
-    int errLine;
-    UString errMsg;
-    RefPtr<EvalNode> evalNode = exec->globalData().parser->parse<EvalNode>(&exec->globalData(), exec->lexicalGlobalObject()->debugger(), exec, m_source, &errLine, &errMsg);
-    if (!evalNode)
-        return Error::create(exec, SyntaxError, errMsg, errLine, m_source.provider()->asID(), m_source.provider()->url());
-    recordParse(evalNode->features(), evalNode->lineNo(), evalNode->lastLine());
+    m_firstLine = firstLine;
+    m_lastLine = lastLine;
+}
 
-    ScopeChain scopeChain(scopeChainNode);
-    JSGlobalObject* globalObject = scopeChain.globalObject();
+
+JSObject* EvalExecutable::compileInternal(ExecState* exec, ScopeChainNode* scopeChainNode)
+{
+    JSObject* exception = 0;
+    JSGlobalData* globalData = &exec->globalData();
+    JSGlobalObject* lexicalGlobalObject = exec->lexicalGlobalObject();
+    if (!lexicalGlobalObject->isEvalEnabled())
+        return throwError(exec, createEvalError(exec, "Eval is disabled"));
+    RefPtr<EvalNode> evalNode = globalData->parser->parse<EvalNode>(lexicalGlobalObject, lexicalGlobalObject->debugger(), exec, m_source, 0, isStrictMode() ? JSParseStrict : JSParseNormal, &exception);
+    if (!evalNode) {
+        ASSERT(exception);
+        return exception;
+    }
+    recordParse(evalNode->features(), evalNode->hasCapturedVariables(), evalNode->lineNo(), evalNode->lastLine());
+
+    JSGlobalObject* globalObject = scopeChainNode->globalObject.get();
 
     ASSERT(!m_evalCodeBlock);
-    m_evalCodeBlock = new EvalCodeBlock(this, globalObject, source().provider(), scopeChain.localDepth());
-    OwnPtr<BytecodeGenerator> generator(new BytecodeGenerator(evalNode.get(), globalObject->debugger(), scopeChain, m_evalCodeBlock->symbolTable(), m_evalCodeBlock));
-    generator->generate();
-    
+    m_evalCodeBlock = adoptPtr(new EvalCodeBlock(this, globalObject, source().provider(), scopeChainNode->localDepth()));
+    OwnPtr<BytecodeGenerator> generator(adoptPtr(new BytecodeGenerator(evalNode.get(), scopeChainNode, m_evalCodeBlock->symbolTable(), m_evalCodeBlock.get())));
+    if ((exception = generator->generate())) {
+        m_evalCodeBlock.clear();
+        evalNode->destroyData();
+        return exception;
+    }
+
     evalNode->destroyData();
+
+#if ENABLE(JIT)
+    if (exec->globalData().canUseJIT()) {
+        m_jitCodeForCall = JIT::compile(scopeChainNode->globalData, m_evalCodeBlock.get());
+#if !ENABLE(OPCODE_SAMPLING)
+        if (!BytecodeGenerator::dumpsGeneratedCode())
+            m_evalCodeBlock->discardBytecode();
+#endif
+    }
+#endif
+
+#if ENABLE(JIT)
+#if ENABLE(INTERPRETER)
+    if (!m_jitCodeForCall)
+        Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_evalCodeBlock));
+    else
+#endif
+    Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_evalCodeBlock) + m_jitCodeForCall.size());
+#else
+    Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_evalCodeBlock));
+#endif
+
     return 0;
 }
 
-JSObject* ProgramExecutable::checkSyntax(ExecState* exec)
+void EvalExecutable::visitChildren(SlotVisitor& visitor)
 {
-    int errLine;
-    UString errMsg;
-    RefPtr<ProgramNode> programNode = exec->globalData().parser->parse<ProgramNode>(&exec->globalData(), exec->lexicalGlobalObject()->debugger(), exec, m_source, &errLine, &errMsg);
-    if (!programNode)
-        return Error::create(exec, SyntaxError, errMsg, errLine, m_source.provider()->asID(), m_source.provider()->url());
-    return 0;
+    ASSERT_GC_OBJECT_INHERITS(this, &s_info);
+    COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
+    ASSERT(structure()->typeInfo().overridesVisitChildren());
+    ScriptExecutable::visitChildren(visitor);
+    if (m_evalCodeBlock)
+        m_evalCodeBlock->visitAggregate(visitor);
 }
 
-JSObject* ProgramExecutable::compile(ExecState* exec, ScopeChainNode* scopeChainNode)
+void EvalExecutable::unlinkCalls()
 {
-    int errLine;
-    UString errMsg;
-    RefPtr<ProgramNode> programNode = exec->globalData().parser->parse<ProgramNode>(&exec->globalData(), exec->lexicalGlobalObject()->debugger(), exec, m_source, &errLine, &errMsg);
-    if (!programNode)
-        return Error::create(exec, SyntaxError, errMsg, errLine, m_source.provider()->asID(), m_source.provider()->url());
-    recordParse(programNode->features(), programNode->lineNo(), programNode->lastLine());
-
-    ScopeChain scopeChain(scopeChainNode);
-    JSGlobalObject* globalObject = scopeChain.globalObject();
-    
-    ASSERT(!m_programCodeBlock);
-    m_programCodeBlock = new ProgramCodeBlock(this, GlobalCode, globalObject, source().provider());
-    OwnPtr<BytecodeGenerator> generator(new BytecodeGenerator(programNode.get(), globalObject->debugger(), scopeChain, &globalObject->symbolTable(), m_programCodeBlock));
-    generator->generate();
+#if ENABLE(JIT)
+    if (!m_jitCodeForCall)
+        return;
+    ASSERT(m_evalCodeBlock);
+    m_evalCodeBlock->unlinkCalls();
+#endif
+}
 
-    programNode->destroyData();
-    return 0;
+JSObject* ProgramExecutable::checkSyntax(ExecState* exec)
+{
+    JSObject* exception = 0;
+    JSGlobalData* globalData = &exec->globalData();
+    JSGlobalObject* lexicalGlobalObject = exec->lexicalGlobalObject();
+    RefPtr<ProgramNode> programNode = globalData->parser->parse<ProgramNode>(lexicalGlobalObject, lexicalGlobalObject->debugger(), exec, m_source, 0, JSParseNormal, &exception);
+    if (programNode)
+        return 0;
+    ASSERT(exception);
+    return exception;
 }
 
-void FunctionExecutable::compile(ExecState*, ScopeChainNode* scopeChainNode)
+JSObject* ProgramExecutable::compileInternal(ExecState* exec, ScopeChainNode* scopeChainNode)
 {
-    JSGlobalData* globalData = scopeChainNode->globalData;
-    RefPtr<FunctionBodyNode> body = globalData->parser->parse<FunctionBodyNode>(globalData, 0, 0, m_source);
-    if (m_forceUsesArguments)
-        body->setUsesArguments();
-    body->finishParsing(m_parameters, m_name);
-    recordParse(body->features(), body->lineNo(), body->lastLine());
+    ASSERT(!m_programCodeBlock);
 
-    ScopeChain scopeChain(scopeChainNode);
-    JSGlobalObject* globalObject = scopeChain.globalObject();
+    JSObject* exception = 0;
+    JSGlobalData* globalData = &exec->globalData();
+    JSGlobalObject* lexicalGlobalObject = exec->lexicalGlobalObject();
+    RefPtr<ProgramNode> programNode = globalData->parser->parse<ProgramNode>(lexicalGlobalObject, lexicalGlobalObject->debugger(), exec, m_source, 0, isStrictMode() ? JSParseStrict : JSParseNormal, &exception);
+    if (!programNode) {
+        ASSERT(exception);
+        return exception;
+    }
+    recordParse(programNode->features(), programNode->hasCapturedVariables(), programNode->lineNo(), programNode->lastLine());
 
-    ASSERT(!m_codeBlock);
-    m_codeBlock = new FunctionCodeBlock(this, FunctionCode, source().provider(), source().startOffset());
-    OwnPtr<BytecodeGenerator> generator(new BytecodeGenerator(body.get(), globalObject->debugger(), scopeChain, m_codeBlock->symbolTable(), m_codeBlock));
-    generator->generate();
-    m_numParameters = m_codeBlock->m_numParameters;
-    ASSERT(m_numParameters);
-    m_numVariables = m_codeBlock->m_numVars;
+    JSGlobalObject* globalObject = scopeChainNode->globalObject.get();
+    
+    m_programCodeBlock = adoptPtr(new ProgramCodeBlock(this, GlobalCode, globalObject, source().provider()));
+    OwnPtr<BytecodeGenerator> generator(adoptPtr(new BytecodeGenerator(programNode.get(), scopeChainNode, &globalObject->symbolTable(), m_programCodeBlock.get())));
+    if ((exception = generator->generate())) {
+        m_programCodeBlock.clear();
+        programNode->destroyData();
+        return exception;
+    }
 
-    body->destroyData();
-}
+    programNode->destroyData();
 
 #if ENABLE(JIT)
+    if (exec->globalData().canUseJIT()) {
+        m_jitCodeForCall = JIT::compile(scopeChainNode->globalData, m_programCodeBlock.get());
+#if !ENABLE(OPCODE_SAMPLING)
+        if (!BytecodeGenerator::dumpsGeneratedCode())
+            m_programCodeBlock->discardBytecode();
+#endif
+    }
+#endif
 
-void EvalExecutable::generateJITCode(ExecState* exec, ScopeChainNode* scopeChainNode)
-{
+#if ENABLE(JIT)
 #if ENABLE(INTERPRETER)
-    ASSERT(scopeChainNode->globalData->canUseJIT());
+    if (!m_jitCodeForCall)
+        Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_programCodeBlock));
+    else
 #endif
-    CodeBlock* codeBlock = &bytecode(exec, scopeChainNode);
-    m_jitCode = JIT::compile(scopeChainNode->globalData, codeBlock);
-
-#if !ENABLE(OPCODE_SAMPLING)
-    if (!BytecodeGenerator::dumpsGeneratedCode())
-        codeBlock->discardBytecode();
+        Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_programCodeBlock) + m_jitCodeForCall.size());
+#else
+    Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_programCodeBlock));
 #endif
+
+    return 0;
 }
 
-void ProgramExecutable::generateJITCode(ExecState* exec, ScopeChainNode* scopeChainNode)
+void ProgramExecutable::unlinkCalls()
 {
-#if ENABLE(INTERPRETER)
-    ASSERT(scopeChainNode->globalData->canUseJIT());
-#endif
-    CodeBlock* codeBlock = &bytecode(exec, scopeChainNode);
-    m_jitCode = JIT::compile(scopeChainNode->globalData, codeBlock);
-
-#if !ENABLE(OPCODE_SAMPLING)
-    if (!BytecodeGenerator::dumpsGeneratedCode())
-        codeBlock->discardBytecode();
+#if ENABLE(JIT)
+    if (!m_jitCodeForCall)
+        return;
+    ASSERT(m_programCodeBlock);
+    m_programCodeBlock->unlinkCalls();
 #endif
 }
 
-void FunctionExecutable::generateJITCode(ExecState* exec, ScopeChainNode* scopeChainNode)
+#if ENABLE(JIT)
+static bool tryDFGCompile(JSGlobalData* globalData, CodeBlock* codeBlock, JITCode& jitCode, MacroAssemblerCodePtr& jitCodeWithArityCheck)
 {
-#if ENABLE(INTERPRETER)
-    ASSERT(scopeChainNode->globalData->canUseJIT());
+#if ENABLE(DFG_JIT)
+#if ENABLE(DFG_JIT_RESTRICTIONS)
+    // FIXME: No flow control yet supported, don't bother scanning the bytecode if there are any jump targets.
+    // FIXME: temporarily disable property accesses until we fix regressions.
+    if (codeBlock->numberOfJumpTargets() || codeBlock->numberOfStructureStubInfos())
+        return false;
 #endif
-    CodeBlock* codeBlock = &bytecode(exec, scopeChainNode);
-    m_jitCode = JIT::compile(scopeChainNode->globalData, codeBlock);
 
-#if !ENABLE(OPCODE_SAMPLING)
-    if (!BytecodeGenerator::dumpsGeneratedCode())
-        codeBlock->discardBytecode();
+    DFG::Graph dfg(codeBlock->m_numParameters, codeBlock->m_numVars);
+    if (!parse(dfg, globalData, codeBlock))
+        return false;
+
+    DFG::JITCompiler dataFlowJIT(globalData, dfg, codeBlock);
+    dataFlowJIT.compileFunction(jitCode, jitCodeWithArityCheck);
+    return true;
+#else
+    UNUSED_PARAM(globalData);
+    UNUSED_PARAM(codeBlock);
+    UNUSED_PARAM(jitCode);
+    UNUSED_PARAM(jitCodeWithArityCheck);
+    return false;
 #endif
 }
-
 #endif
 
-void FunctionExecutable::markAggregate(MarkStack& markStack)
+void ProgramExecutable::visitChildren(SlotVisitor& visitor)
 {
-    if (m_codeBlock)
-        m_codeBlock->markAggregate(markStack);
+    ASSERT_GC_OBJECT_INHERITS(this, &s_info);
+    COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
+    ASSERT(structure()->typeInfo().overridesVisitChildren());
+    ScriptExecutable::visitChildren(visitor);
+    if (m_programCodeBlock)
+        m_programCodeBlock->visitAggregate(visitor);
 }
 
-ExceptionInfo* FunctionExecutable::reparseExceptionInfo(JSGlobalData* globalData, ScopeChainNode* scopeChainNode, CodeBlock* codeBlock)
+JSObject* FunctionExecutable::compileForCallInternal(ExecState* exec, ScopeChainNode* scopeChainNode)
 {
-    RefPtr<FunctionBodyNode> newFunctionBody = globalData->parser->parse<FunctionBodyNode>(globalData, 0, 0, m_source);
+    JSObject* exception = 0;
+    JSGlobalData* globalData = scopeChainNode->globalData;
+    RefPtr<FunctionBodyNode> body = globalData->parser->parse<FunctionBodyNode>(exec->lexicalGlobalObject(), 0, 0, m_source, m_parameters.get(), isStrictMode() ? JSParseStrict : JSParseNormal, &exception);
+    if (!body) {
+        ASSERT(exception);
+        return exception;
+    }
     if (m_forceUsesArguments)
-        newFunctionBody->setUsesArguments();
-    newFunctionBody->finishParsing(m_parameters, m_name);
+        body->setUsesArguments();
+    body->finishParsing(m_parameters, m_name);
+    recordParse(body->features(), body->hasCapturedVariables(), body->lineNo(), body->lastLine());
 
-    ScopeChain scopeChain(scopeChainNode);
-    JSGlobalObject* globalObject = scopeChain.globalObject();
+    JSGlobalObject* globalObject = scopeChainNode->globalObject.get();
 
-    OwnPtr<CodeBlock> newCodeBlock(new FunctionCodeBlock(this, FunctionCode, source().provider(), source().startOffset()));
-    globalData->functionCodeBlockBeingReparsed = newCodeBlock.get();
+    ASSERT(!m_codeBlockForCall);
+    m_codeBlockForCall = adoptPtr(new FunctionCodeBlock(this, FunctionCode, globalObject, source().provider(), source().startOffset(), false));
+    OwnPtr<BytecodeGenerator> generator(adoptPtr(new BytecodeGenerator(body.get(), scopeChainNode, m_codeBlockForCall->symbolTable(), m_codeBlockForCall.get())));
+    if ((exception = generator->generate())) {
+        m_codeBlockForCall.clear();
+        body->destroyData();
+        return exception;
+    }
 
-    OwnPtr<BytecodeGenerator> generator(new BytecodeGenerator(newFunctionBody.get(), globalObject->debugger(), scopeChain, newCodeBlock->symbolTable(), newCodeBlock.get()));
-    generator->setRegeneratingForExceptionInfo(static_cast<FunctionCodeBlock*>(codeBlock));
-    generator->generate();
+    m_numParametersForCall = m_codeBlockForCall->m_numParameters;
+    ASSERT(m_numParametersForCall);
+    m_numCapturedVariables = m_codeBlockForCall->m_numCapturedVars;
+    m_symbolTable = m_codeBlockForCall->sharedSymbolTable();
 
-    ASSERT(newCodeBlock->instructionCount() == codeBlock->instructionCount());
+    body->destroyData();
 
 #if ENABLE(JIT)
-#if ENABLE(INTERPRETER)
-    if (globalData->canUseJIT())
+    if (exec->globalData().canUseJIT()) {
+        bool dfgCompiled = tryDFGCompile(&exec->globalData(), m_codeBlockForCall.get(), m_jitCodeForCall, m_jitCodeForCallWithArityCheck);
+        if (!dfgCompiled)
+            m_jitCodeForCall = JIT::compile(scopeChainNode->globalData, m_codeBlockForCall.get(), &m_jitCodeForCallWithArityCheck);
+
+#if !ENABLE(OPCODE_SAMPLING)
+        if (!BytecodeGenerator::dumpsGeneratedCode())
+            m_codeBlockForCall->discardBytecode();
 #endif
-    {
-        JITCode newJITCode = JIT::compile(globalData, newCodeBlock.get(), generatedJITCode().start());
-        ASSERT(newJITCode.size() == generatedJITCode().size());
     }
 #endif
 
-    globalData->functionCodeBlockBeingReparsed = 0;
+#if ENABLE(JIT)
+#if ENABLE(INTERPRETER)
+    if (!m_jitCodeForCall)
+        Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_codeBlockForCall));
+    else
+#endif
+        Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_codeBlockForCall) + m_jitCodeForCall.size());
+#else
+    Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_codeBlockForCall));
+#endif
 
-    return newCodeBlock->extractExceptionInfo();
+    return 0;
 }
 
-ExceptionInfo* EvalExecutable::reparseExceptionInfo(JSGlobalData* globalData, ScopeChainNode* scopeChainNode, CodeBlock* codeBlock)
+JSObject* FunctionExecutable::compileForConstructInternal(ExecState* exec, ScopeChainNode* scopeChainNode)
 {
-    RefPtr<EvalNode> newEvalBody = globalData->parser->parse<EvalNode>(globalData, 0, 0, m_source);
+    JSObject* exception = 0;
+    JSGlobalData* globalData = scopeChainNode->globalData;
+    RefPtr<FunctionBodyNode> body = globalData->parser->parse<FunctionBodyNode>(exec->lexicalGlobalObject(), 0, 0, m_source, m_parameters.get(), isStrictMode() ? JSParseStrict : JSParseNormal, &exception);
+    if (!body) {
+        ASSERT(exception);
+        return exception;
+    }
+    if (m_forceUsesArguments)
+        body->setUsesArguments();
+    body->finishParsing(m_parameters, m_name);
+    recordParse(body->features(), body->hasCapturedVariables(), body->lineNo(), body->lastLine());
 
-    ScopeChain scopeChain(scopeChainNode);
-    JSGlobalObject* globalObject = scopeChain.globalObject();
+    JSGlobalObject* globalObject = scopeChainNode->globalObject.get();
 
-    OwnPtr<EvalCodeBlock> newCodeBlock(new EvalCodeBlock(this, globalObject, source().provider(), scopeChain.localDepth()));
+    ASSERT(!m_codeBlockForConstruct);
+    m_codeBlockForConstruct = adoptPtr(new FunctionCodeBlock(this, FunctionCode, globalObject, source().provider(), source().startOffset(), true));
+    OwnPtr<BytecodeGenerator> generator(adoptPtr(new BytecodeGenerator(body.get(), scopeChainNode, m_codeBlockForConstruct->symbolTable(), m_codeBlockForConstruct.get())));
+    if ((exception = generator->generate())) {
+        m_codeBlockForConstruct.clear();
+        body->destroyData();
+        return exception;
+    }
 
-    OwnPtr<BytecodeGenerator> generator(new BytecodeGenerator(newEvalBody.get(), globalObject->debugger(), scopeChain, newCodeBlock->symbolTable(), newCodeBlock.get()));
-    generator->setRegeneratingForExceptionInfo(static_cast<EvalCodeBlock*>(codeBlock));
-    generator->generate();
+    m_numParametersForConstruct = m_codeBlockForConstruct->m_numParameters;
+    ASSERT(m_numParametersForConstruct);
+    m_numCapturedVariables = m_codeBlockForConstruct->m_numCapturedVars;
+    m_symbolTable = m_codeBlockForConstruct->sharedSymbolTable();
 
-    ASSERT(newCodeBlock->instructionCount() == codeBlock->instructionCount());
+    body->destroyData();
 
 #if ENABLE(JIT)
-#if ENABLE(INTERPRETER)
-    if (globalData->canUseJIT())
+    if (exec->globalData().canUseJIT()) {
+        m_jitCodeForConstruct = JIT::compile(scopeChainNode->globalData, m_codeBlockForConstruct.get(), &m_jitCodeForConstructWithArityCheck);
+#if !ENABLE(OPCODE_SAMPLING)
+        if (!BytecodeGenerator::dumpsGeneratedCode())
+            m_codeBlockForConstruct->discardBytecode();
 #endif
-    {
-        JITCode newJITCode = JIT::compile(globalData, newCodeBlock.get(), generatedJITCode().start());
-        ASSERT(newJITCode.size() == generatedJITCode().size());
     }
 #endif
 
-    return newCodeBlock->extractExceptionInfo();
+#if ENABLE(JIT)
+#if ENABLE(INTERPRETER)
+    if (!m_jitCodeForConstruct)
+        Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_codeBlockForConstruct));
+    else
+#endif
+    Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_codeBlockForConstruct) + m_jitCodeForConstruct.size());
+#else
+    Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_codeBlockForConstruct));
+#endif
+
+    return 0;
+}
+
+void FunctionExecutable::visitChildren(SlotVisitor& visitor)
+{
+    ASSERT_GC_OBJECT_INHERITS(this, &s_info);
+    COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
+    ASSERT(structure()->typeInfo().overridesVisitChildren());
+    ScriptExecutable::visitChildren(visitor);
+    if (m_codeBlockForCall)
+        m_codeBlockForCall->visitAggregate(visitor);
+    if (m_codeBlockForConstruct)
+        m_codeBlockForConstruct->visitAggregate(visitor);
 }
 
-void FunctionExecutable::recompile()
+void FunctionExecutable::discardCode()
 {
-    delete m_codeBlock;
-    m_codeBlock = 0;
-    m_numParameters = NUM_PARAMETERS_NOT_COMPILED;
 #if ENABLE(JIT)
-    m_jitCode = JITCode();
+    // These first two checks are to handle the rare case where
+    // we are trying to evict code for a function during its
+    // codegen.
+    if (!m_jitCodeForCall && m_codeBlockForCall)
+        return;
+    if (!m_jitCodeForConstruct && m_codeBlockForConstruct)
+        return;
+    m_jitCodeForCall = JITCode();
+    m_jitCodeForConstruct = JITCode();
+    m_jitCodeForCallWithArityCheck = MacroAssemblerCodePtr();
+    m_jitCodeForConstructWithArityCheck = MacroAssemblerCodePtr();
 #endif
+    if (m_codeBlockForCall)
+        m_codeBlockForCall->clearEvalCache();
+    m_codeBlockForCall.clear();
+    if (m_codeBlockForConstruct)
+        m_codeBlockForConstruct->clearEvalCache();
+    m_codeBlockForConstruct.clear();
+    m_numParametersForCall = NUM_PARAMETERS_NOT_COMPILED;
+    m_numParametersForConstruct = NUM_PARAMETERS_NOT_COMPILED;
+
 }
 
-PassRefPtr<FunctionExecutable> FunctionExecutable::fromGlobalCode(const Identifier& functionName, ExecState* exec, Debugger* debugger, const SourceCode& source, int* errLine, UString* errMsg)
+void FunctionExecutable::unlinkCalls()
 {
-    RefPtr<ProgramNode> program = exec->globalData().parser->parse<ProgramNode>(&exec->globalData(), debugger, exec, source, errLine, errMsg);
-    if (!program)
+#if ENABLE(JIT)
+    if (!!m_jitCodeForCall) {
+        ASSERT(m_codeBlockForCall);
+        m_codeBlockForCall->unlinkCalls();
+    }
+    if (!!m_jitCodeForConstruct) {
+        ASSERT(m_codeBlockForConstruct);
+        m_codeBlockForConstruct->unlinkCalls();
+    }
+#endif
+}
+
+FunctionExecutable* FunctionExecutable::fromGlobalCode(const Identifier& functionName, ExecState* exec, Debugger* debugger, const SourceCode& source, JSObject** exception)
+{
+    JSGlobalObject* lexicalGlobalObject = exec->lexicalGlobalObject();
+    RefPtr<ProgramNode> program = exec->globalData().parser->parse<ProgramNode>(lexicalGlobalObject, debugger, exec, source, 0, JSParseNormal, exception);
+    if (!program) {
+        ASSERT(*exception);
         return 0;
+    }
 
+    // Uses of this function that would not result in a single function expression are invalid.
     StatementNode* exprStatement = program->singleStatement();
     ASSERT(exprStatement);
     ASSERT(exprStatement->isExprStatement());
-    if (!exprStatement || !exprStatement->isExprStatement())
-        return 0;
-
     ExpressionNode* funcExpr = static_cast<ExprStatementNode*>(exprStatement)->expr();
     ASSERT(funcExpr);
     ASSERT(funcExpr->isFuncExprNode());
-    if (!funcExpr || !funcExpr->isFuncExprNode())
-        return 0;
-
     FunctionBodyNode* body = static_cast<FuncExprNode*>(funcExpr)->body();
     ASSERT(body);
-    return FunctionExecutable::create(&exec->globalData(), functionName, body->source(), body->usesArguments(), body->parameters(), body->lineNo(), body->lastLine());
+
+    return FunctionExecutable::create(&exec->globalData(), functionName, body->source(), body->usesArguments(), body->parameters(), body->isStrictMode(), body->lineNo(), body->lastLine());
 }
 
 UString FunctionExecutable::paramString() const
 {
     FunctionParameters& parameters = *m_parameters;
-    StringBuilder builder;
+    UStringBuilder builder;
     for (size_t pos = 0; pos < parameters.size(); ++pos) {
         if (!builder.isEmpty())
             builder.append(", ");
         builder.append(parameters[pos].ustring());
     }
-    return builder.build();
+    return builder.toUString();
 }
 
-};
-
-
+}