code.vuplus.com Git - vuplus_webkit/blob - Source/JavaScriptCore/runtime/Executable.cpp

   1 /*
   2  * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  * 1. Redistributions of source code must retain the above copyright
   8  *    notice, this list of conditions and the following disclaimer.
   9  * 2. Redistributions in binary form must reproduce the above copyright
  10  *    notice, this list of conditions and the following disclaimer in the
  11  *    documentation and/or other materials provided with the distribution.
  12  *
  13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
  14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  15  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  16  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE INC. OR
  17  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  18  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  19  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  20  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  21  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  22  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  23  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  24  */
  25
  26 #include "config.h"
  27 #include "Executable.h"
  28
  29 #include "BytecodeGenerator.h"
  30 #include "CodeBlock.h"
  31 #include "DFGDriver.h"
  32 #include "JIT.h"
  33 #include "Parser.h"
  34 #include "UStringBuilder.h"
  35 #include "Vector.h"
  36
  37 namespace JSC {
  38
  39 const ClassInfo ExecutableBase::s_info = { "Executable", 0, 0, 0 };
  40
  41 void ExecutableBase::clearCode()
  42 {
  43 #if ENABLE(JIT)
  44     m_jitCodeForCall.clear();
  45     m_jitCodeForConstruct.clear();
  46     m_jitCodeForCallWithArityCheck = MacroAssemblerCodePtr();
  47     m_jitCodeForConstructWithArityCheck = MacroAssemblerCodePtr();
  48 #endif
  49     m_numParametersForCall = NUM_PARAMETERS_NOT_COMPILED;
  50     m_numParametersForConstruct = NUM_PARAMETERS_NOT_COMPILED;
  51 }
  52
  53 class ExecutableFinalizer : public WeakHandleOwner {
  54     virtual void finalize(Handle<Unknown> handle, void*)
  55     {
  56         Weak<ExecutableBase> executable(Weak<ExecutableBase>::Adopt, handle);
  57         executable->clearCode();
  58     }
  59 };
  60
  61 WeakHandleOwner* ExecutableBase::executableFinalizer()
  62 {
  63     DEFINE_STATIC_LOCAL(ExecutableFinalizer, finalizer, ());
  64     return &finalizer;
  65 }
  66
  67 const ClassInfo NativeExecutable::s_info = { "NativeExecutable", &ExecutableBase::s_info, 0, 0 };
  68
  69 NativeExecutable::~NativeExecutable()
  70 {
  71 }
  72
  73 const ClassInfo ScriptExecutable::s_info = { "ScriptExecutable", &ExecutableBase::s_info, 0, 0 };
  74
  75 const ClassInfo EvalExecutable::s_info = { "EvalExecutable", &ScriptExecutable::s_info, 0, 0 };
  76
  77 EvalExecutable::EvalExecutable(ExecState* exec, const SourceCode& source, bool inStrictContext)
  78     : ScriptExecutable(exec->globalData().evalExecutableStructure.get(), exec, source, inStrictContext)
  79 {
  80 }
  81
  82 EvalExecutable::~EvalExecutable()
  83 {
  84 }
  85
  86 const ClassInfo ProgramExecutable::s_info = { "ProgramExecutable", &ScriptExecutable::s_info, 0, 0 };
  87
  88 ProgramExecutable::ProgramExecutable(ExecState* exec, const SourceCode& source)
  89     : ScriptExecutable(exec->globalData().programExecutableStructure.get(), exec, source, false)
  90 {
  91 }
  92
  93 ProgramExecutable::~ProgramExecutable()
  94 {
  95 }
  96
  97 const ClassInfo FunctionExecutable::s_info = { "FunctionExecutable", &ScriptExecutable::s_info, 0, 0 };
  98
  99 FunctionExecutable::FunctionExecutable(JSGlobalData& globalData, const Identifier& name, const SourceCode& source, bool forceUsesArguments, FunctionParameters* parameters, bool inStrictContext)
 100     : ScriptExecutable(globalData.functionExecutableStructure.get(), globalData, source, inStrictContext)
 101     , m_numCapturedVariables(0)
 102     , m_forceUsesArguments(forceUsesArguments)
 103     , m_parameters(parameters)
 104     , m_name(name)
 105     , m_symbolTable(0)
 106 {
 107 }
 108
 109 FunctionExecutable::FunctionExecutable(ExecState* exec, const Identifier& name, const SourceCode& source, bool forceUsesArguments, FunctionParameters* parameters, bool inStrictContext)
 110     : ScriptExecutable(exec->globalData().functionExecutableStructure.get(), exec, source, inStrictContext)
 111     , m_numCapturedVariables(0)
 112     , m_forceUsesArguments(forceUsesArguments)
 113     , m_parameters(parameters)
 114     , m_name(name)
 115     , m_symbolTable(0)
 116 {
 117 }
 118
 119 JSObject* EvalExecutable::compileOptimized(ExecState* exec, ScopeChainNode* scopeChainNode)
 120 {
 121     ASSERT(exec->globalData().dynamicGlobalObject);
 122     ASSERT(!!m_evalCodeBlock);
 123     JSObject* error = 0;
 124     if (m_evalCodeBlock->getJITType() != JITCode::topTierJIT())
 125         error = compileInternal(exec, scopeChainNode, JITCode::nextTierJIT(m_evalCodeBlock->getJITType()));
 126     ASSERT(!!m_evalCodeBlock);
 127     return error;
 128 }
 129
 130 JSObject* EvalExecutable::compileInternal(ExecState* exec, ScopeChainNode* scopeChainNode, JITCode::JITType jitType)
 131 {
 132 #if !ENABLE(JIT)
 133     UNUSED_PARAM(jitType);
 134 #endif
 135     JSObject* exception = 0;
 136     JSGlobalData* globalData = &exec->globalData();
 137     JSGlobalObject* lexicalGlobalObject = exec->lexicalGlobalObject();
 138     if (!lexicalGlobalObject->evalEnabled())
 139         return throwError(exec, createEvalError(exec, "Eval is disabled"));
 140     RefPtr<EvalNode> evalNode = globalData->parser->parse<EvalNode>(lexicalGlobalObject, lexicalGlobalObject->debugger(), exec, m_source, 0, isStrictMode() ? JSParseStrict : JSParseNormal, &exception);
 141     if (!evalNode) {
 142         ASSERT(exception);
 143         return exception;
 144     }
 145     recordParse(evalNode->features(), evalNode->hasCapturedVariables(), evalNode->lineNo(), evalNode->lastLine());
 146
 147     JSGlobalObject* globalObject = scopeChainNode->globalObject.get();
 148
 149     OwnPtr<CodeBlock> previousCodeBlock = m_evalCodeBlock.release();
 150     ASSERT((jitType == JITCode::bottomTierJIT()) == !previousCodeBlock);
 151     m_evalCodeBlock = adoptPtr(new EvalCodeBlock(this, globalObject, source().provider(), scopeChainNode->localDepth(), previousCodeBlock.release()));
 152     OwnPtr<BytecodeGenerator> generator(adoptPtr(new BytecodeGenerator(evalNode.get(), scopeChainNode, m_evalCodeBlock->symbolTable(), m_evalCodeBlock.get(), !!m_evalCodeBlock->alternative() ? BytecodeGenerator::OptimizingCompilation : BytecodeGenerator::FirstCompilation)));
 153     if ((exception = generator->generate())) {
 154         m_evalCodeBlock = static_pointer_cast<EvalCodeBlock>(m_evalCodeBlock->releaseAlternative());
 155         evalNode->destroyData();
 156         return exception;
 157     }
 158
 159     evalNode->destroyData();
 160     m_evalCodeBlock->copyDataFromAlternative();
 161
 162 #if ENABLE(JIT)
 163     if (exec->globalData().canUseJIT()) {
 164         bool dfgCompiled = false;
 165         if (jitType == JITCode::DFGJIT)
 166             dfgCompiled = DFG::tryCompile(exec, m_evalCodeBlock.get(), m_jitCodeForCall);
 167         if (dfgCompiled)
 168             ASSERT(!m_evalCodeBlock->alternative() || !m_evalCodeBlock->alternative()->hasIncomingCalls());
 169         else {
 170             if (m_evalCodeBlock->alternative()) {
 171                 // There is already an alternative piece of code compiled with a different
 172                 // JIT, so we can silently fail.
 173                 m_evalCodeBlock = static_pointer_cast<EvalCodeBlock>(m_evalCodeBlock->releaseAlternative());
 174                 return 0;
 175             }
 176             m_jitCodeForCall = JIT::compile(scopeChainNode->globalData, m_evalCodeBlock.get());
 177         }
 178 #if !ENABLE(OPCODE_SAMPLING)
 179         if (!BytecodeGenerator::dumpsGeneratedCode())
 180             m_evalCodeBlock->discardBytecode();
 181 #endif
 182         m_evalCodeBlock->setJITCode(m_jitCodeForCall, MacroAssemblerCodePtr());
 183     }
 184 #endif
 185
 186 #if ENABLE(JIT)
 187 #if ENABLE(INTERPRETER)
 188     if (!m_jitCodeForCall)
 189         Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_evalCodeBlock));
 190     else
 191 #endif
 192     Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_evalCodeBlock) + m_jitCodeForCall.size());
 193 #else
 194     Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_evalCodeBlock));
 195 #endif
 196
 197     return 0;
 198 }
 199
 200 void EvalExecutable::visitChildren(SlotVisitor& visitor)
 201 {
 202     ASSERT_GC_OBJECT_INHERITS(this, &s_info);
 203     COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
 204     ASSERT(structure()->typeInfo().overridesVisitChildren());
 205     ScriptExecutable::visitChildren(visitor);
 206     if (m_evalCodeBlock)
 207         m_evalCodeBlock->visitAggregate(visitor);
 208 }
 209
 210 void EvalExecutable::unlinkCalls()
 211 {
 212 #if ENABLE(JIT)
 213     if (!m_jitCodeForCall)
 214         return;
 215     ASSERT(m_evalCodeBlock);
 216     m_evalCodeBlock->unlinkCalls();
 217 #endif
 218 }
 219
 220 void EvalExecutable::clearCode()
 221 {
 222     if (m_evalCodeBlock) {
 223         m_evalCodeBlock->clearEvalCache();
 224         m_evalCodeBlock.clear();
 225     }
 226     Base::clearCode();
 227 }
 228
 229 JSObject* ProgramExecutable::checkSyntax(ExecState* exec)
 230 {
 231     JSObject* exception = 0;
 232     JSGlobalData* globalData = &exec->globalData();
 233     JSGlobalObject* lexicalGlobalObject = exec->lexicalGlobalObject();
 234     RefPtr<ProgramNode> programNode = globalData->parser->parse<ProgramNode>(lexicalGlobalObject, lexicalGlobalObject->debugger(), exec, m_source, 0, JSParseNormal, &exception);
 235     if (programNode)
 236         return 0;
 237     ASSERT(exception);
 238     return exception;
 239 }
 240
 241 JSObject* ProgramExecutable::compileOptimized(ExecState* exec, ScopeChainNode* scopeChainNode)
 242 {
 243     ASSERT(exec->globalData().dynamicGlobalObject);
 244     ASSERT(!!m_programCodeBlock);
 245     JSObject* error = 0;
 246     if (m_programCodeBlock->getJITType() != JITCode::topTierJIT())
 247         error = compileInternal(exec, scopeChainNode, JITCode::nextTierJIT(m_programCodeBlock->getJITType()));
 248     ASSERT(!!m_programCodeBlock);
 249     return error;
 250 }
 251
 252 JSObject* ProgramExecutable::compileInternal(ExecState* exec, ScopeChainNode* scopeChainNode, JITCode::JITType jitType)
 253 {
 254 #if !ENABLE(JIT)
 255     UNUSED_PARAM(jitType);
 256 #endif
 257     JSObject* exception = 0;
 258     JSGlobalData* globalData = &exec->globalData();
 259     JSGlobalObject* lexicalGlobalObject = exec->lexicalGlobalObject();
 260     RefPtr<ProgramNode> programNode = globalData->parser->parse<ProgramNode>(lexicalGlobalObject, lexicalGlobalObject->debugger(), exec, m_source, 0, isStrictMode() ? JSParseStrict : JSParseNormal, &exception);
 261     if (!programNode) {
 262         ASSERT(exception);
 263         return exception;
 264     }
 265     recordParse(programNode->features(), programNode->hasCapturedVariables(), programNode->lineNo(), programNode->lastLine());
 266
 267     JSGlobalObject* globalObject = scopeChainNode->globalObject.get();
 268
 269     OwnPtr<CodeBlock> previousCodeBlock = m_programCodeBlock.release();
 270     ASSERT((jitType == JITCode::bottomTierJIT()) == !previousCodeBlock);
 271     m_programCodeBlock = adoptPtr(new ProgramCodeBlock(this, GlobalCode, globalObject, source().provider(), previousCodeBlock.release()));
 272     OwnPtr<BytecodeGenerator> generator(adoptPtr(new BytecodeGenerator(programNode.get(), scopeChainNode, &globalObject->symbolTable(), m_programCodeBlock.get(), !!m_programCodeBlock->alternative() ? BytecodeGenerator::OptimizingCompilation : BytecodeGenerator::FirstCompilation)));
 273     if ((exception = generator->generate())) {
 274         m_programCodeBlock = static_pointer_cast<ProgramCodeBlock>(m_programCodeBlock->releaseAlternative());
 275         programNode->destroyData();
 276         return exception;
 277     }
 278
 279     programNode->destroyData();
 280     m_programCodeBlock->copyDataFromAlternative();
 281
 282 #if ENABLE(JIT)
 283     if (exec->globalData().canUseJIT()) {
 284         bool dfgCompiled = false;
 285         if (jitType == JITCode::DFGJIT)
 286             dfgCompiled = DFG::tryCompile(exec, m_programCodeBlock.get(), m_jitCodeForCall);
 287         if (dfgCompiled) {
 288             if (m_programCodeBlock->alternative())
 289                 m_programCodeBlock->alternative()->unlinkIncomingCalls();
 290         } else {
 291             if (m_programCodeBlock->alternative()) {
 292                 m_programCodeBlock = static_pointer_cast<ProgramCodeBlock>(m_programCodeBlock->releaseAlternative());
 293                 return 0;
 294             }
 295             m_jitCodeForCall = JIT::compile(scopeChainNode->globalData, m_programCodeBlock.get());
 296         }
 297 #if !ENABLE(OPCODE_SAMPLING)
 298         if (!BytecodeGenerator::dumpsGeneratedCode())
 299             m_programCodeBlock->discardBytecode();
 300 #endif
 301         m_programCodeBlock->setJITCode(m_jitCodeForCall, MacroAssemblerCodePtr());
 302     }
 303 #endif
 304
 305 #if ENABLE(JIT)
 306 #if ENABLE(INTERPRETER)
 307     if (!m_jitCodeForCall)
 308         Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_programCodeBlock));
 309     else
 310 #endif
 311         Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_programCodeBlock) + m_jitCodeForCall.size());
 312 #else
 313     Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_programCodeBlock));
 314 #endif
 315
 316     return 0;
 317 }
 318
 319 void ProgramExecutable::unlinkCalls()
 320 {
 321 #if ENABLE(JIT)
 322     if (!m_jitCodeForCall)
 323         return;
 324     ASSERT(m_programCodeBlock);
 325     m_programCodeBlock->unlinkCalls();
 326 #endif
 327 }
 328
 329 void ProgramExecutable::visitChildren(SlotVisitor& visitor)
 330 {
 331     ASSERT_GC_OBJECT_INHERITS(this, &s_info);
 332     COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
 333     ASSERT(structure()->typeInfo().overridesVisitChildren());
 334     ScriptExecutable::visitChildren(visitor);
 335     if (m_programCodeBlock)
 336         m_programCodeBlock->visitAggregate(visitor);
 337 }
 338
 339 void ProgramExecutable::clearCode()
 340 {
 341     if (m_programCodeBlock) {
 342         m_programCodeBlock->clearEvalCache();
 343         m_programCodeBlock.clear();
 344     }
 345     Base::clearCode();
 346 }
 347
 348 JSObject* FunctionExecutable::compileOptimizedForCall(ExecState* exec, ScopeChainNode* scopeChainNode, ExecState* calleeArgsExec)
 349 {
 350     ASSERT(exec->globalData().dynamicGlobalObject);
 351     ASSERT(!!m_codeBlockForCall);
 352     JSObject* error = 0;
 353     if (m_codeBlockForCall->getJITType() != JITCode::topTierJIT())
 354         error = compileForCallInternal(exec, scopeChainNode, calleeArgsExec, JITCode::nextTierJIT(m_codeBlockForCall->getJITType()));
 355     ASSERT(!!m_codeBlockForCall);
 356     return error;
 357 }
 358
 359 JSObject* FunctionExecutable::compileOptimizedForConstruct(ExecState* exec, ScopeChainNode* scopeChainNode)
 360 {
 361     ASSERT(exec->globalData().dynamicGlobalObject);
 362     ASSERT(!!m_codeBlockForConstruct);
 363     JSObject* error = 0;
 364     if (m_codeBlockForConstruct->getJITType() != JITCode::topTierJIT())
 365         error = compileForConstructInternal(exec, scopeChainNode, JITCode::nextTierJIT(m_codeBlockForConstruct->getJITType()));
 366     ASSERT(!!m_codeBlockForConstruct);
 367     return error;
 368 }
 369
 370 JSObject* FunctionExecutable::compileForCallInternal(ExecState* exec, ScopeChainNode* scopeChainNode, ExecState* calleeArgsExec, JITCode::JITType jitType)
 371 {
 372 #if !ENABLE(JIT)
 373     UNUSED_PARAM(jitType);
 374 #endif
 375     JSObject* exception = 0;
 376     JSGlobalData* globalData = scopeChainNode->globalData;
 377     RefPtr<FunctionBodyNode> body = globalData->parser->parse<FunctionBodyNode>(exec->lexicalGlobalObject(), 0, 0, m_source, m_parameters.get(), isStrictMode() ? JSParseStrict : JSParseNormal, &exception);
 378     if (!body) {
 379         ASSERT(exception);
 380         return exception;
 381     }
 382     if (m_forceUsesArguments)
 383         body->setUsesArguments();
 384     body->finishParsing(m_parameters, m_name);
 385     recordParse(body->features(), body->hasCapturedVariables(), body->lineNo(), body->lastLine());
 386
 387     JSGlobalObject* globalObject = scopeChainNode->globalObject.get();
 388
 389     OwnPtr<CodeBlock> previousCodeBlock = m_codeBlockForCall.release();
 390     ASSERT((jitType == JITCode::bottomTierJIT()) == !previousCodeBlock);
 391     m_codeBlockForCall = adoptPtr(new FunctionCodeBlock(this, FunctionCode, globalObject, source().provider(), source().startOffset(), false, previousCodeBlock.release()));
 392     OwnPtr<BytecodeGenerator> generator(adoptPtr(new BytecodeGenerator(body.get(), scopeChainNode, m_codeBlockForCall->symbolTable(), m_codeBlockForCall.get(), !!m_codeBlockForCall->alternative() ? BytecodeGenerator::OptimizingCompilation : BytecodeGenerator::FirstCompilation)));
 393     if ((exception = generator->generate())) {
 394         m_codeBlockForCall = static_pointer_cast<FunctionCodeBlock>(m_codeBlockForCall->releaseAlternative());
 395         body->destroyData();
 396         return exception;
 397     }
 398
 399     m_numParametersForCall = m_codeBlockForCall->m_numParameters;
 400     ASSERT(m_numParametersForCall);
 401     m_numCapturedVariables = m_codeBlockForCall->m_numCapturedVars;
 402     m_symbolTable = m_codeBlockForCall->sharedSymbolTable();
 403
 404     body->destroyData();
 405     m_codeBlockForCall->copyDataFromAlternative();
 406
 407 #if ENABLE(JIT)
 408     if (exec->globalData().canUseJIT()) {
 409         bool dfgCompiled = false;
 410         if (jitType == JITCode::DFGJIT)
 411             dfgCompiled = DFG::tryCompileFunction(exec, calleeArgsExec, m_codeBlockForCall.get(), m_jitCodeForCall, m_jitCodeForCallWithArityCheck);
 412         if (dfgCompiled) {
 413             if (m_codeBlockForCall->alternative())
 414                 m_codeBlockForCall->alternative()->unlinkIncomingCalls();
 415         } else {
 416             if (m_codeBlockForCall->alternative()) {
 417                 m_codeBlockForCall = static_pointer_cast<FunctionCodeBlock>(m_codeBlockForCall->releaseAlternative());
 418                 m_symbolTable = m_codeBlockForCall->sharedSymbolTable();
 419                 return 0;
 420             }
 421             m_jitCodeForCall = JIT::compile(scopeChainNode->globalData, m_codeBlockForCall.get(), &m_jitCodeForCallWithArityCheck);
 422         }
 423 #if !ENABLE(OPCODE_SAMPLING)
 424         if (!BytecodeGenerator::dumpsGeneratedCode())
 425             m_codeBlockForCall->discardBytecode();
 426 #endif
 427
 428         m_codeBlockForCall->setJITCode(m_jitCodeForCall, m_jitCodeForCallWithArityCheck);
 429     }
 430 #else
 431     UNUSED_PARAM(calleeArgsExec);
 432 #endif
 433
 434 #if ENABLE(JIT)
 435 #if ENABLE(INTERPRETER)
 436     if (!m_jitCodeForCall)
 437         Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_codeBlockForCall));
 438     else
 439 #endif
 440         Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_codeBlockForCall) + m_jitCodeForCall.size());
 441 #else
 442     Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_codeBlockForCall));
 443 #endif
 444
 445     return 0;
 446 }
 447
 448 JSObject* FunctionExecutable::compileForConstructInternal(ExecState* exec, ScopeChainNode* scopeChainNode, JITCode::JITType jitType)
 449 {
 450     UNUSED_PARAM(jitType);
 451
 452     JSObject* exception = 0;
 453     JSGlobalData* globalData = scopeChainNode->globalData;
 454     RefPtr<FunctionBodyNode> body = globalData->parser->parse<FunctionBodyNode>(exec->lexicalGlobalObject(), 0, 0, m_source, m_parameters.get(), isStrictMode() ? JSParseStrict : JSParseNormal, &exception);
 455     if (!body) {
 456         ASSERT(exception);
 457         return exception;
 458     }
 459     if (m_forceUsesArguments)
 460         body->setUsesArguments();
 461     body->finishParsing(m_parameters, m_name);
 462     recordParse(body->features(), body->hasCapturedVariables(), body->lineNo(), body->lastLine());
 463
 464     JSGlobalObject* globalObject = scopeChainNode->globalObject.get();
 465
 466     OwnPtr<CodeBlock> previousCodeBlock = m_codeBlockForConstruct.release();
 467     ASSERT((jitType == JITCode::bottomTierJIT()) == !previousCodeBlock);
 468     m_codeBlockForConstruct = adoptPtr(new FunctionCodeBlock(this, FunctionCode, globalObject, source().provider(), source().startOffset(), true, previousCodeBlock.release()));
 469     OwnPtr<BytecodeGenerator> generator(adoptPtr(new BytecodeGenerator(body.get(), scopeChainNode, m_codeBlockForConstruct->symbolTable(), m_codeBlockForConstruct.get(), !!m_codeBlockForConstruct->alternative() ? BytecodeGenerator::OptimizingCompilation : BytecodeGenerator::FirstCompilation)));
 470     if ((exception = generator->generate())) {
 471         m_codeBlockForConstruct = static_pointer_cast<FunctionCodeBlock>(m_codeBlockForConstruct->releaseAlternative());
 472         body->destroyData();
 473         return exception;
 474     }
 475
 476     m_numParametersForConstruct = m_codeBlockForConstruct->m_numParameters;
 477     ASSERT(m_numParametersForConstruct);
 478     m_numCapturedVariables = m_codeBlockForConstruct->m_numCapturedVars;
 479     m_symbolTable = m_codeBlockForConstruct->sharedSymbolTable();
 480
 481     body->destroyData();
 482     m_codeBlockForConstruct->copyDataFromAlternative();
 483
 484 #if ENABLE(JIT)
 485     if (exec->globalData().canUseJIT()) {
 486         bool dfgCompiled = false;
 487         // FIXME: Make it possible to compile constructors with DFG.
 488         if (dfgCompiled) {
 489             if (m_codeBlockForConstruct->alternative())
 490                 m_codeBlockForConstruct->alternative()->unlinkIncomingCalls();
 491         } else {
 492             if (m_codeBlockForConstruct->alternative()) {
 493                 m_codeBlockForConstruct = static_pointer_cast<FunctionCodeBlock>(m_codeBlockForConstruct->releaseAlternative());
 494                 m_symbolTable = m_codeBlockForConstruct->sharedSymbolTable();
 495                 return 0;
 496             }
 497             m_jitCodeForConstruct = JIT::compile(scopeChainNode->globalData, m_codeBlockForConstruct.get(), &m_jitCodeForConstructWithArityCheck);
 498         }
 499 #if !ENABLE(OPCODE_SAMPLING)
 500         if (!BytecodeGenerator::dumpsGeneratedCode())
 501             m_codeBlockForConstruct->discardBytecode();
 502 #endif
 503
 504         m_codeBlockForConstruct->setJITCode(m_jitCodeForConstruct, m_jitCodeForConstructWithArityCheck);
 505     }
 506 #endif
 507
 508 #if ENABLE(JIT)
 509 #if ENABLE(INTERPRETER)
 510     if (!m_jitCodeForConstruct)
 511         Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_codeBlockForConstruct));
 512     else
 513 #endif
 514     Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_codeBlockForConstruct) + m_jitCodeForConstruct.size());
 515 #else
 516     Heap::heap(this)->reportExtraMemoryCost(sizeof(*m_codeBlockForConstruct));
 517 #endif
 518
 519     return 0;
 520 }
 521
 522 void FunctionExecutable::visitChildren(SlotVisitor& visitor)
 523 {
 524     ASSERT_GC_OBJECT_INHERITS(this, &s_info);
 525     COMPILE_ASSERT(StructureFlags & OverridesVisitChildren, OverridesVisitChildrenWithoutSettingFlag);
 526     ASSERT(structure()->typeInfo().overridesVisitChildren());
 527     ScriptExecutable::visitChildren(visitor);
 528     if (m_nameValue)
 529         visitor.append(&m_nameValue);
 530     if (m_codeBlockForCall)
 531         m_codeBlockForCall->visitAggregate(visitor);
 532     if (m_codeBlockForConstruct)
 533         m_codeBlockForConstruct->visitAggregate(visitor);
 534 }
 535
 536 void FunctionExecutable::discardCode()
 537 {
 538 #if ENABLE(JIT)
 539     // These first two checks are to handle the rare case where
 540     // we are trying to evict code for a function during its
 541     // codegen.
 542     if (!m_jitCodeForCall && m_codeBlockForCall)
 543         return;
 544     if (!m_jitCodeForConstruct && m_codeBlockForConstruct)
 545         return;
 546 #endif
 547     clearCode();
 548 }
 549
 550 void FunctionExecutable::clearCode()
 551 {
 552     if (m_codeBlockForCall) {
 553         m_codeBlockForCall->clearEvalCache();
 554         m_codeBlockForCall.clear();
 555     }
 556     if (m_codeBlockForConstruct) {
 557         m_codeBlockForConstruct->clearEvalCache();
 558         m_codeBlockForConstruct.clear();
 559     }
 560     Base::clearCode();
 561 }
 562
 563 void FunctionExecutable::unlinkCalls()
 564 {
 565 #if ENABLE(JIT)
 566     if (!!m_jitCodeForCall) {
 567         ASSERT(m_codeBlockForCall);
 568         m_codeBlockForCall->unlinkCalls();
 569     }
 570     if (!!m_jitCodeForConstruct) {
 571         ASSERT(m_codeBlockForConstruct);
 572         m_codeBlockForConstruct->unlinkCalls();
 573     }
 574 #endif
 575 }
 576
 577 FunctionExecutable* FunctionExecutable::fromGlobalCode(const Identifier& functionName, ExecState* exec, Debugger* debugger, const SourceCode& source, JSObject** exception)
 578 {
 579     JSGlobalObject* lexicalGlobalObject = exec->lexicalGlobalObject();
 580     RefPtr<ProgramNode> program = exec->globalData().parser->parse<ProgramNode>(lexicalGlobalObject, debugger, exec, source, 0, JSParseNormal, exception);
 581     if (!program) {
 582         ASSERT(*exception);
 583         return 0;
 584     }
 585
 586     // Uses of this function that would not result in a single function expression are invalid.
 587     StatementNode* exprStatement = program->singleStatement();
 588     ASSERT(exprStatement);
 589     ASSERT(exprStatement->isExprStatement());
 590     ExpressionNode* funcExpr = static_cast<ExprStatementNode*>(exprStatement)->expr();
 591     ASSERT(funcExpr);
 592     ASSERT(funcExpr->isFuncExprNode());
 593     FunctionBodyNode* body = static_cast<FuncExprNode*>(funcExpr)->body();
 594     ASSERT(body);
 595
 596     return FunctionExecutable::create(exec->globalData(), functionName, body->source(), body->usesArguments(), body->parameters(), body->isStrictMode(), body->lineNo(), body->lastLine());
 597 }
 598
 599 UString FunctionExecutable::paramString() const
 600 {
 601     FunctionParameters& parameters = *m_parameters;
 602     UStringBuilder builder;
 603     for (size_t pos = 0; pos < parameters.size(); ++pos) {
 604         if (!builder.isEmpty())
 605             builder.append(", ");
 606         builder.append(parameters[pos].ustring());
 607     }
 608     return builder.toUString();
 609 }
 610
 611 }