C++ StringPrintStream类代码示例

CString MacroAssemblerCodeRef::disassembly() const
{
    StringPrintStream out;
    if (!tryToDisassemble(out, ""))
        return CString();
    return out.toCString();
}

void Value::deepDump(PrintStream& out) const
{
    out.print(m_type, " ", *this, " = ", m_opcode);

    out.print("(");
    CommaPrinter comma;
    for (Value* child : children())
        out.print(comma, pointerDump(child));

    if (m_origin)
        out.print(comma, m_origin);

    {
        StringPrintStream stringOut;
        dumpMeta(stringOut);
        CString string = stringOut.toCString();
        if (string.length())
            out.print(comma, string);
    }

    {
        CString string = toCString(effects());
        if (string.length())
            out.print(comma, string);
    }

    out.print(")");
}

Vector<JITDisassembler::DumpedOp> JITDisassembler::dumpVectorForInstructions(LinkBuffer& linkBuffer, const char* prefix, Vector<MacroAssembler::Label>& labels, MacroAssembler::Label endLabel)
{
    StringPrintStream out;
    Vector<DumpedOp> result;
    
    for (unsigned i = 0; i < labels.size();) {
        if (!labels[i].isSet()) {
            i++;
            continue;
        }
        out.reset();
        result.append(DumpedOp());
        result.last().index = i;
        out.print(prefix);
        m_codeBlock->dumpBytecode(out, i);
        for (unsigned nextIndex = i + 1; ; nextIndex++) {
            if (nextIndex >= labels.size()) {
                dumpDisassembly(out, linkBuffer, labels[i], endLabel);
                result.last().disassembly = out.toCString();
                return result;
            }
            if (labels[nextIndex].isSet()) {
                dumpDisassembly(out, linkBuffer, labels[i], labels[nextIndex]);
                result.last().disassembly = out.toCString();
                i = nextIndex;
                break;
            }
        }
    }
    
    return result;
}

BytecodeSequence::BytecodeSequence(CodeBlock* codeBlock)
{
    StringPrintStream out;
    
    for (unsigned i = 0; i < codeBlock->numberOfArgumentValueProfiles(); ++i) {
        ConcurrentJSLocker locker(codeBlock->m_lock);
        CString description = codeBlock->valueProfileForArgument(i)->briefDescription(locker);
        if (!description.length())
            continue;
        out.reset();
        out.print("arg", i, ": ", description);
        m_header.append(out.toCString());
    }
    
    StubInfoMap stubInfos;
    codeBlock->getStubInfoMap(stubInfos);
    
    for (unsigned bytecodeIndex = 0; bytecodeIndex < codeBlock->instructions().size();) {
        out.reset();
        codeBlock->dumpBytecode(out, bytecodeIndex, stubInfos);
        m_sequence.append(Bytecode(bytecodeIndex, codeBlock->vm()->interpreter->getOpcodeID(codeBlock->instructions()[bytecodeIndex].u.opcode), out.toCString()));
        bytecodeIndex += opcodeLength(
            codeBlock->vm()->interpreter->getOpcodeID(
                codeBlock->instructions()[bytecodeIndex].u.opcode));
    }
}

void AdaptiveInferredPropertyValueWatchpoint::fire(const FireDetail& detail)
{
    // One of the watchpoints fired, but the other one didn't. Make sure that neither of them are
    // in any set anymore. This simplifies things by allowing us to reinstall the watchpoints
    // wherever from scratch.
    if (m_structureWatchpoint.isOnList())
        m_structureWatchpoint.remove();
    if (m_propertyWatchpoint.isOnList())
        m_propertyWatchpoint.remove();
    
    if (m_key.isWatchable(PropertyCondition::EnsureWatchability)) {
        install();
        return;
    }
    
    if (DFG::shouldShowDisassembly()) {
        dataLog(
            "Firing watchpoint ", RawPointer(this), " (", m_key, ") on ", *m_codeBlock, "\n");
    }
    
    StringPrintStream out;
    out.print("Adaptation of ", m_key, " failed: ", detail);
    
    StringFireDetail stringDetail(out.toCString().data());
    
    m_codeBlock->jettison(
        Profiler::JettisonDueToUnprofiledWatchpoint, CountReoptimization, &stringDetail);
}

void ObjectToStringAdaptiveInferredPropertyValueWatchpoint::handleFire(const FireDetail& detail)
{
    StringPrintStream out;
    out.print("Adaptation of ", key(), " failed: ", detail);
    
    StringFireDetail stringDetail(out.toCString().data());
    
    m_structureRareData->clearObjectToStringValue();
}

void ObjectToStringAdaptiveStructureWatchpoint::fireInternal(const FireDetail& detail)
{
    if (m_key.isWatchable(PropertyCondition::EnsureWatchability)) {
        install();
        return;
    }

    StringPrintStream out;
    out.print("ObjectToStringValue Adaptation of ", m_key, " failed: ", detail);

    StringFireDetail stringDetail(out.toCString().data());

    m_structureRareData->clearObjectToStringValue();
}

void Phase::beginPhase()
{
    if (Options::verboseValidationFailure()) {
        StringPrintStream out;
        m_graph.dump(out);
        m_graphDumpBeforePhase = out.toCString();
    }

    if (!shouldDumpGraphAtEachPhase(m_graph.m_plan.mode()))
        return;
    
    dataLog("Beginning DFG phase ", m_name, ".\n");
    dataLog("Before ", m_name, ":\n");
    m_graph.dump();
}

CString ExceptionScope::unexpectedExceptionMessage()
{
    StringPrintStream out;

    out.println("Unexpected exception observed on thread ", currentThread(), " at:");
    auto currentStack = StackTrace::captureStackTrace(Options::unexpectedExceptionStackTraceLimit(), 1);
    currentStack->dump(out, "    ");

    if (!m_vm.nativeStackTraceOfLastThrow())
        return CString();

    out.println("The exception was thrown from thread ", m_vm.throwingThread(), " at:");
    m_vm.nativeStackTraceOfLastThrow()->dump(out, "    ");

    return out.toCString();
}

void AdaptiveStructureWatchpoint::fireInternal(const FireDetail& detail)
{
    if (m_key.isWatchable(PropertyCondition::EnsureWatchability)) {
        install();
        return;
    }
    
    if (DFG::shouldDumpDisassembly()) {
        dataLog(
            "Firing watchpoint ", RawPointer(this), " (", m_key, ") on ", *m_codeBlock, "\n");
    }
    
    StringPrintStream out;
    out.print("Adaptation of ", m_key, " failed: ", detail);
    
    StringFireDetail stringDetail(out.toCString().data());
    
    m_codeBlock->jettison(
        Profiler::JettisonDueToUnprofiledWatchpoint, CountReoptimization, &stringDetail);
}

LinkBuffer::CodeRef LinkBuffer::finalizeCodeWithDisassembly(const char* format, ...)
{
    CodeRef result = finalizeCodeWithoutDisassembly();

    if (m_alreadyDisassembled)
        return result;
    
    StringPrintStream out;
    out.printf("Generated JIT code for ");
    va_list argList;
    va_start(argList, format);
    out.vprintf(format, argList);
    va_end(argList);
    out.printf(":\n");

    out.printf("    Code at [%p, %p):\n", result.code().executableAddress(), static_cast<char*>(result.code().executableAddress()) + result.size());
    
    CString header = out.toCString();
    
    if (Options::asyncDisassembly()) {
        disassembleAsynchronously(header, result, m_size, "    ");
        return result;
    }
    
    dataLog(header);
    disassemble(result.code(), m_size, "    ", WTF::dataFile());
    
    return result;
}

void JITDisassembler::reportToProfiler(Profiler::Compilation* compilation, LinkBuffer& linkBuffer)
{
    StringPrintStream out;
    
    dumpHeader(out, linkBuffer);
    compilation->addDescription(Profiler::CompiledBytecode(Profiler::OriginStack(), out.toCString()));
    out.reset();
    dumpDisassembly(out, linkBuffer, m_startOfCode, m_labelForBytecodeIndexInMainPath[0]);
    compilation->addDescription(Profiler::CompiledBytecode(Profiler::OriginStack(), out.toCString()));
    
    reportInstructions(compilation, linkBuffer, "    ", m_labelForBytecodeIndexInMainPath, firstSlowLabel());
    compilation->addDescription(Profiler::CompiledBytecode(Profiler::OriginStack(), "    (End Of Main Path)\n"));
    reportInstructions(compilation, linkBuffer, "    (S) ", m_labelForBytecodeIndexInSlowPath, m_endOfSlowPath);
    compilation->addDescription(Profiler::CompiledBytecode(Profiler::OriginStack(), "    (End Of Slow Path)\n"));
    out.reset();
    dumpDisassembly(out, linkBuffer, m_endOfSlowPath, m_endOfCode);
    compilation->addDescription(Profiler::CompiledBytecode(Profiler::OriginStack(), out.toCString()));
}

//.........这里部分代码省略.........
    , keywords(adoptPtr(new Keywords(this)))
    , interpreter(0)
    , jsArrayClassInfo(&JSArray::s_info)
    , jsFinalObjectClassInfo(&JSFinalObject::s_info)
#if ENABLE(DFG_JIT)
    , sizeOfLastScratchBuffer(0)
#endif
    , dynamicGlobalObject(0)
    , cachedUTCOffset(QNaN)
    , m_enabledProfiler(0)
    , m_regExpCache(new RegExpCache(this))
#if ENABLE(REGEXP_TRACING)
    , m_rtTraceList(new RTTraceList())
#endif
#ifndef NDEBUG
    , exclusiveThread(0)
#endif
    , m_newStringsSinceLastHashCons(0)
#if ENABLE(ASSEMBLER)
    , m_canUseAssembler(enableAssembler(executableAllocator))
#endif
#if ENABLE(JIT)
    , m_canUseJIT(m_canUseAssembler && Options::useJIT())
#endif
#if ENABLE(YARR_JIT)
    , m_canUseRegExpJIT(m_canUseAssembler && Options::useRegExpJIT())
#endif
#if ENABLE(GC_VALIDATION)
    , m_initializingObjectClass(0)
#endif
    , m_inDefineOwnProperty(false)
    , m_codeCache(CodeCache::create())
{
    interpreter = new Interpreter(*this);

    // Need to be careful to keep everything consistent here
    JSLockHolder lock(this);
    IdentifierTable* existingEntryIdentifierTable = wtfThreadData().setCurrentIdentifierTable(identifierTable);
    structureStructure.set(*this, Structure::createStructure(*this));
    structureRareDataStructure.set(*this, StructureRareData::createStructure(*this, 0, jsNull()));
    debuggerActivationStructure.set(*this, DebuggerActivation::createStructure(*this, 0, jsNull()));
    terminatedExecutionErrorStructure.set(*this, TerminatedExecutionError::createStructure(*this, 0, jsNull()));
    stringStructure.set(*this, JSString::createStructure(*this, 0, jsNull()));
    notAnObjectStructure.set(*this, JSNotAnObject::createStructure(*this, 0, jsNull()));
    propertyNameIteratorStructure.set(*this, JSPropertyNameIterator::createStructure(*this, 0, jsNull()));
    getterSetterStructure.set(*this, GetterSetter::createStructure(*this, 0, jsNull()));
    apiWrapperStructure.set(*this, JSAPIValueWrapper::createStructure(*this, 0, jsNull()));
    JSScopeStructure.set(*this, JSScope::createStructure(*this, 0, jsNull()));
    executableStructure.set(*this, ExecutableBase::createStructure(*this, 0, jsNull()));
    nativeExecutableStructure.set(*this, NativeExecutable::createStructure(*this, 0, jsNull()));
    evalExecutableStructure.set(*this, EvalExecutable::createStructure(*this, 0, jsNull()));
    programExecutableStructure.set(*this, ProgramExecutable::createStructure(*this, 0, jsNull()));
    functionExecutableStructure.set(*this, FunctionExecutable::createStructure(*this, 0, jsNull()));
    regExpStructure.set(*this, RegExp::createStructure(*this, 0, jsNull()));
    sharedSymbolTableStructure.set(*this, SharedSymbolTable::createStructure(*this, 0, jsNull()));
    structureChainStructure.set(*this, StructureChain::createStructure(*this, 0, jsNull()));
    sparseArrayValueMapStructure.set(*this, SparseArrayValueMap::createStructure(*this, 0, jsNull()));
    withScopeStructure.set(*this, JSWithScope::createStructure(*this, 0, jsNull()));
    unlinkedFunctionExecutableStructure.set(*this, UnlinkedFunctionExecutable::createStructure(*this, 0, jsNull()));
    unlinkedProgramCodeBlockStructure.set(*this, UnlinkedProgramCodeBlock::createStructure(*this, 0, jsNull()));
    unlinkedEvalCodeBlockStructure.set(*this, UnlinkedEvalCodeBlock::createStructure(*this, 0, jsNull()));
    unlinkedFunctionCodeBlockStructure.set(*this, UnlinkedFunctionCodeBlock::createStructure(*this, 0, jsNull()));
    propertyTableStructure.set(*this, PropertyTable::createStructure(*this, 0, jsNull()));
    smallStrings.initializeCommonStrings(*this);

    wtfThreadData().setCurrentIdentifierTable(existingEntryIdentifierTable);

#if ENABLE(JIT)
    jitStubs = adoptPtr(new JITThunks());
    performPlatformSpecificJITAssertions(this);
#endif
    
    interpreter->initialize(this->canUseJIT());
    
#if ENABLE(JIT)
    initializeHostCallReturnValue(); // This is needed to convince the linker not to drop host call return support.
#endif

    heap.notifyIsSafeToCollect();

    LLInt::Data::performAssertions(*this);
    
    if (Options::enableProfiler()) {
        m_perBytecodeProfiler = adoptPtr(new Profiler::Database(*this));

        StringPrintStream pathOut;
#if !OS(WINCE)
        const char* profilerPath = getenv("JSC_PROFILER_PATH");
        if (profilerPath)
            pathOut.print(profilerPath, "/");
#endif
        pathOut.print("JSCProfile-", getCurrentProcessID(), "-", m_perBytecodeProfiler->databaseID(), ".json");
        m_perBytecodeProfiler->registerToSaveAtExit(pathOut.toCString().data());
    }

#if ENABLE(DFG_JIT)
    if (canUseJIT())
        m_dfgState = adoptPtr(new DFG::LongLivedState());
#endif
}

void Disassembler::append(Vector<Disassembler::DumpedOp>& result, StringPrintStream& out, CodeOrigin& previousOrigin)
{
    result.append(DumpedOp(previousOrigin, out.toCString()));
    previousOrigin = CodeOrigin();
    out.reset();
}

//.........这里部分代码省略.........
    symbolStructure.set(*this, Symbol::createStructure(*this, 0, jsNull()));
    symbolTableStructure.set(*this, SymbolTable::createStructure(*this, 0, jsNull()));
    structureChainStructure.set(*this, StructureChain::createStructure(*this, 0, jsNull()));
    sparseArrayValueMapStructure.set(*this, SparseArrayValueMap::createStructure(*this, 0, jsNull()));
    templateRegistryKeyStructure.set(*this, JSTemplateRegistryKey::createStructure(*this, 0, jsNull()));
    arrayBufferNeuteringWatchpointStructure.set(*this, ArrayBufferNeuteringWatchpoint::createStructure(*this));
    unlinkedFunctionExecutableStructure.set(*this, UnlinkedFunctionExecutable::createStructure(*this, 0, jsNull()));
    unlinkedProgramCodeBlockStructure.set(*this, UnlinkedProgramCodeBlock::createStructure(*this, 0, jsNull()));
    unlinkedEvalCodeBlockStructure.set(*this, UnlinkedEvalCodeBlock::createStructure(*this, 0, jsNull()));
    unlinkedFunctionCodeBlockStructure.set(*this, UnlinkedFunctionCodeBlock::createStructure(*this, 0, jsNull()));
    unlinkedModuleProgramCodeBlockStructure.set(*this, UnlinkedModuleProgramCodeBlock::createStructure(*this, 0, jsNull()));
    propertyTableStructure.set(*this, PropertyTable::createStructure(*this, 0, jsNull()));
    weakMapDataStructure.set(*this, WeakMapData::createStructure(*this, 0, jsNull()));
    inferredValueStructure.set(*this, InferredValue::createStructure(*this, 0, jsNull()));
    inferredTypeStructure.set(*this, InferredType::createStructure(*this, 0, jsNull()));
    inferredTypeTableStructure.set(*this, InferredTypeTable::createStructure(*this, 0, jsNull()));
    functionRareDataStructure.set(*this, FunctionRareData::createStructure(*this, 0, jsNull()));
    generatorFrameStructure.set(*this, GeneratorFrame::createStructure(*this, 0, jsNull()));
    exceptionStructure.set(*this, Exception::createStructure(*this, 0, jsNull()));
    promiseDeferredStructure.set(*this, JSPromiseDeferred::createStructure(*this, 0, jsNull()));
    internalPromiseDeferredStructure.set(*this, JSInternalPromiseDeferred::createStructure(*this, 0, jsNull()));
    programCodeBlockStructure.set(*this, ProgramCodeBlock::createStructure(*this, 0, jsNull()));
    moduleProgramCodeBlockStructure.set(*this, ModuleProgramCodeBlock::createStructure(*this, 0, jsNull()));
    evalCodeBlockStructure.set(*this, EvalCodeBlock::createStructure(*this, 0, jsNull()));
    functionCodeBlockStructure.set(*this, FunctionCodeBlock::createStructure(*this, 0, jsNull()));
#if ENABLE(WEBASSEMBLY)
    webAssemblyCodeBlockStructure.set(*this, WebAssemblyCodeBlock::createStructure(*this, 0, jsNull()));
#endif

    iterationTerminator.set(*this, JSFinalObject::create(*this, JSFinalObject::createStructure(*this, 0, jsNull(), 1)));
    nativeStdFunctionCellStructure.set(*this, NativeStdFunctionCell::createStructure(*this, 0, jsNull()));
    smallStrings.initializeCommonStrings(*this);

    wtfThreadData().setCurrentAtomicStringTable(existingEntryAtomicStringTable);

#if ENABLE(JIT)
    jitStubs = std::make_unique<JITThunks>();
    allCalleeSaveRegisterOffsets = std::make_unique<RegisterAtOffsetList>(RegisterSet::vmCalleeSaveRegisters(), RegisterAtOffsetList::ZeroBased);
#endif
    arityCheckData = std::make_unique<CommonSlowPaths::ArityCheckData>();

#if ENABLE(FTL_JIT)
    ftlThunks = std::make_unique<FTL::Thunks>();
#endif // ENABLE(FTL_JIT)
    
    interpreter->initialize();
    
#if ENABLE(JIT)
    initializeHostCallReturnValue(); // This is needed to convince the linker not to drop host call return support.
#endif

    heap.notifyIsSafeToCollect();
    
    LLInt::Data::performAssertions(*this);
    
    if (Options::useProfiler()) {
        m_perBytecodeProfiler = std::make_unique<Profiler::Database>(*this);

        StringPrintStream pathOut;
        const char* profilerPath = getenv("JSC_PROFILER_PATH");
        if (profilerPath)
            pathOut.print(profilerPath, "/");
        pathOut.print("JSCProfile-", getCurrentProcessID(), "-", m_perBytecodeProfiler->databaseID(), ".json");
        m_perBytecodeProfiler->registerToSaveAtExit(pathOut.toCString().data());
    }

    callFrameForCatch = nullptr;

#if ENABLE(DFG_JIT)
    if (canUseJIT())
        dfgState = std::make_unique<DFG::LongLivedState>();
#endif
    
    // Initialize this last, as a free way of asserting that VM initialization itself
    // won't use this.
    m_typedArrayController = adoptRef(new SimpleTypedArrayController());

    m_bytecodeIntrinsicRegistry = std::make_unique<BytecodeIntrinsicRegistry>(*this);

    if (Options::useTypeProfiler())
        enableTypeProfiler();
    if (Options::useControlFlowProfiler())
        enableControlFlowProfiler();
#if ENABLE(SAMPLING_PROFILER)
    if (Options::useSamplingProfiler()) {
        setShouldBuildPCToCodeOriginMapping();
        m_samplingProfiler = adoptRef(new SamplingProfiler(*this, Stopwatch::create()));
        m_samplingProfiler->start();
    }
#endif // ENABLE(SAMPLING_PROFILER)

    if (Options::alwaysGeneratePCToCodeOriginMap())
        setShouldBuildPCToCodeOriginMapping();

    if (Options::watchdog()) {
        std::chrono::milliseconds timeoutMillis(Options::watchdog());
        Watchdog& watchdog = ensureWatchdog();
        watchdog.setTimeLimit(timeoutMillis);
    }
}