C++ ExecutableBase类代码示例

int SamplingProfiler::StackFrame::startLine()
{
    if (frameType == FrameType::Unknown || frameType == FrameType::Host)
        return -1;
    RELEASE_ASSERT(frameType != FrameType::UnverifiedCallee);

    ExecutableBase* executable = u.verifiedExecutable;
    if (executable->isHostFunction())
        return -1;
    return static_cast<ScriptExecutable*>(executable)->firstLine();
}

String SamplingProfiler::StackFrame::url()
{
    if (frameType == FrameType::Unknown || frameType == FrameType::Host)
        return emptyString();
    RELEASE_ASSERT(frameType != FrameType::UnverifiedCallee);

    ExecutableBase* executable = u.verifiedExecutable;
    if (executable->isHostFunction())
        return emptyString();

    String url = static_cast<ScriptExecutable*>(executable)->sourceURL();
    if (url.isEmpty())
        return static_cast<ScriptExecutable*>(executable)->source().provider()->sourceURL(); // Fall back to sourceURL directive.
    return url;
}

void Heap::deleteAllCompiledCode()
{
    // If JavaScript is running, it's not safe to delete code, since we'll end
    // up deleting code that is live on the stack.
    if (m_vm->entryScope)
        return;

    for (ExecutableBase* current = m_compiledCode.head(); current; current = current->next()) {
        if (!current->isFunctionExecutable())
            continue;
        static_cast<FunctionExecutable*>(current)->clearCodeIfNotCompiling();
    }

    m_codeBlocks.clearMarks();
    m_codeBlocks.deleteUnmarkedAndUnreferenced();
}

void Heap::deleteUnmarkedCompiledCode()
{
    ExecutableBase* next;
    for (ExecutableBase* current = m_compiledCode.head(); current; current = next) {
        next = current->next();
        if (isMarked(current))
            continue;

        // We do this because executable memory is limited on some platforms and because
        // CodeBlock requires eager finalization.
        ExecutableBase::clearCodeVirtual(current);
        m_compiledCode.remove(current);
    }

    m_codeBlocks.deleteUnmarkedAndUnreferenced();
    m_jitStubRoutines.deleteUnmarkedJettisonedStubRoutines();
}

EncodedJSValue JSC_HOST_CALL boundThisNoArgsFunctionCall(ExecState* exec)
{
    JSBoundFunction* boundFunction = jsCast<JSBoundFunction*>(exec->jsCallee());

    MarkedArgumentBuffer args;
    for (unsigned i = 0; i < exec->argumentCount(); ++i)
        args.append(exec->uncheckedArgument(i));

    JSFunction* targetFunction = jsCast<JSFunction*>(boundFunction->targetFunction());
    ExecutableBase* executable = targetFunction->executable();
    if (executable->hasJITCodeForCall()) {
        // Force the executable to cache its arity entrypoint.
        executable->entrypointFor(CodeForCall, MustCheckArity);
    }
    CallData callData;
    CallType callType = getCallData(targetFunction, callData);
    ASSERT(callType != CallType::None);
    return JSValue::encode(call(exec, targetFunction, callType, callData, boundFunction->boundThis(), args));
}

inline void* virtualFor(ExecState* execCallee, CodeSpecializationKind kind)
{
    ExecState* exec = execCallee->callerFrame();
    JSValue calleeAsValue = execCallee->calleeAsValue();
    JSCell* calleeAsFunctionCell = getJSFunction(calleeAsValue);
    if (UNLIKELY(!calleeAsFunctionCell))
        return handleHostCall(execCallee, calleeAsValue, kind);
    
    JSFunction* function = asFunction(calleeAsFunctionCell);
    execCallee->setScopeChain(function->scopeUnchecked());
    ExecutableBase* executable = function->executable();
    if (UNLIKELY(!executable->hasJITCodeFor(kind))) {
        FunctionExecutable* functionExecutable = static_cast<FunctionExecutable*>(executable);
        JSObject* error = functionExecutable->compileFor(execCallee, function->scope(), kind);
        if (error) {
            exec->globalData().exception = error;
            return 0;
        }
    }
    return executable->generatedJITCodeWithArityCheckFor(kind).executableAddress();
}

String SamplingProfiler::StackFrame::displayNameForJSONTests()
{
    if (frameType == FrameType::Unknown)
        return ASCIILiteral("(unknown)");
    if (frameType == FrameType::Host)
        return ASCIILiteral("(host)");
    RELEASE_ASSERT(frameType != FrameType::UnverifiedCallee);

    ExecutableBase* executable = u.verifiedExecutable;
    if (executable->isHostFunction())
        return static_cast<NativeExecutable*>(executable)->name();

    if (executable->isFunctionExecutable()) {
        String result = static_cast<FunctionExecutable*>(executable)->inferredName().string();
        if (result.isEmpty())
            return ASCIILiteral("(anonymous function)");
        return result;
    }
    if (executable->isEvalExecutable())
        return ASCIILiteral("(eval)");
    if (executable->isProgramExecutable())
        return ASCIILiteral("(program)");
    if (executable->isModuleProgramExecutable())
        return ASCIILiteral("(module)");

    RELEASE_ASSERT_NOT_REACHED();
    return String();
}

inline char* linkFor(ExecState* execCallee, CodeSpecializationKind kind)
{
    ExecState* exec = execCallee->callerFrame();
    VM* vm = &exec->vm();
    NativeCallFrameTracer tracer(vm, exec);
    
    JSValue calleeAsValue = execCallee->calleeAsValue();
    JSCell* calleeAsFunctionCell = getJSFunction(calleeAsValue);
    if (!calleeAsFunctionCell)
        return reinterpret_cast<char*>(handleHostCall(execCallee, calleeAsValue, kind));

    JSFunction* callee = jsCast<JSFunction*>(calleeAsFunctionCell);
    execCallee->setScope(callee->scopeUnchecked());
    ExecutableBase* executable = callee->executable();

    MacroAssemblerCodePtr codePtr;
    CodeBlock* codeBlock = 0;
    if (executable->isHostFunction())
        codePtr = executable->generatedJITCodeFor(kind)->addressForCall();
    else {
        FunctionExecutable* functionExecutable = static_cast<FunctionExecutable*>(executable);
        JSObject* error = functionExecutable->prepareForExecution(execCallee, callee->scope(), kind);
        if (error) {
            vm->throwException(exec, createStackOverflowError(exec));
            return reinterpret_cast<char*>(vm->getCTIStub(throwExceptionFromCallSlowPathGenerator).code().executableAddress());
        }
        codeBlock = functionExecutable->codeBlockFor(kind);
        if (execCallee->argumentCountIncludingThis() < static_cast<size_t>(codeBlock->numParameters()))
            codePtr = functionExecutable->generatedJITCodeWithArityCheckFor(kind);
        else
            codePtr = functionExecutable->generatedJITCodeFor(kind)->addressForCall();
    }
    CallLinkInfo& callLinkInfo = exec->codeBlock()->getCallLinkInfo(execCallee->returnPC());
    if (!callLinkInfo.seenOnce())
        callLinkInfo.setSeen();
    else
        linkFor(execCallee, callLinkInfo, codeBlock, callee, codePtr, kind);
    return reinterpret_cast<char*>(codePtr.executableAddress());
}

inline char* virtualForWithFunction(ExecState* execCallee, CodeSpecializationKind kind, JSCell*& calleeAsFunctionCell)
{
    ExecState* exec = execCallee->callerFrame();
    VM* vm = &exec->vm();
    NativeCallFrameTracer tracer(vm, exec);

    JSValue calleeAsValue = execCallee->calleeAsValue();
    calleeAsFunctionCell = getJSFunction(calleeAsValue);
    if (UNLIKELY(!calleeAsFunctionCell))
        return reinterpret_cast<char*>(handleHostCall(execCallee, calleeAsValue, kind));
    
    JSFunction* function = jsCast<JSFunction*>(calleeAsFunctionCell);
    execCallee->setScope(function->scopeUnchecked());
    ExecutableBase* executable = function->executable();
    if (UNLIKELY(!executable->hasJITCodeFor(kind))) {
        FunctionExecutable* functionExecutable = static_cast<FunctionExecutable*>(executable);
        JSObject* error = functionExecutable->prepareForExecution(execCallee, function->scope(), kind);
        if (error) {
            exec->vm().throwException(execCallee, error);
            return reinterpret_cast<char*>(vm->getCTIStub(throwExceptionFromCallSlowPathGenerator).code().executableAddress());
        }
    }
    return reinterpret_cast<char*>(executable->generatedJITCodeWithArityCheckFor(kind).executableAddress());
}