C++ SourceCode::provider方法代码示例

void Lexer::setCode(const SourceCode& source, ParserArena& arena)
{
    m_arena = &arena.identifierArena();

    m_lineNumber = source.firstLine();
    m_delimited = false;
    m_lastToken = -1;

    const UChar* data = source.provider()->data();

    m_source = &source;
    m_codeStart = data;
    m_code = data + source.startOffset();
    m_codeEnd = data + source.endOffset();
    m_error = false;
    m_atLineStart = true;

    // ECMA-262 calls for stripping all Cf characters, but we only strip BOM characters.
    // See <https://bugs.webkit.org/show_bug.cgi?id=4931> for details.
    if (source.provider()->hasBOMs()) {
        for (const UChar* p = m_codeStart; p < m_codeEnd; ++p) {
            if (UNLIKELY(*p == byteOrderMark)) {
                copyCodeWithoutBOMs();
                break;
            }
        }
    }

    // Read the first characters into the 4-character buffer.
    shift4();
    ASSERT(currentOffset() == source.startOffset());
}

void Lexer<T>::setCode(const SourceCode& source, ParserArena* arena)
{
    m_arena = &arena->identifierArena();
    
    m_lineNumber = source.firstLine();
    m_delimited = false;
    m_lastToken = -1;
    
    const StringImpl* sourceString = source.provider()->data();

    if (sourceString)
        setCodeStart(sourceString);
    else
        m_codeStart = 0;

    m_source = &source;
    m_code = m_codeStart + source.startOffset();
    m_codeEnd = m_codeStart + source.endOffset();
    m_error = false;
    m_atLineStart = true;
    m_lexErrorMessage = UString();
    
    m_buffer8.reserveInitialCapacity(initialReadBufferCapacity);
    m_buffer16.reserveInitialCapacity((m_codeEnd - m_code) / 2);
    
    if (LIKELY(m_code < m_codeEnd))
        m_current = *m_code;
    else
        m_current = -1;
    ASSERT(currentOffset() == source.startOffset());
}

// ECMA 15.3.2 The Function Constructor
JSObject* constructFunction(ExecState* exec, const ArgList& args, const Identifier& functionName, const UString& sourceURL, int lineNumber)
{
    // Functions need to have a space following the opening { due to for web compatibility
    // see https://bugs.webkit.org/show_bug.cgi?id=24350
    // We also need \n before the closing } to handle // comments at the end of the last line
    UString program;
    if (args.isEmpty())
        program = "(function() { \n})";
    else if (args.size() == 1)
        program = makeString("(function() { ", args.at(0).toString(exec), "\n})");
    else {
        StringBuilder builder;
        builder.append("(function(");
        builder.append(args.at(0).toString(exec));
        for (size_t i = 1; i < args.size() - 1; i++) {
            builder.append(",");
            builder.append(args.at(i).toString(exec));
        }
        builder.append(") { ");
        builder.append(args.at(args.size() - 1).toString(exec));
        builder.append("\n})");
        program = builder.build();
    }

    int errLine;
    UString errMsg;
    SourceCode source = makeSource(program, sourceURL, lineNumber);
    RefPtr<FunctionExecutable> function = FunctionExecutable::fromGlobalCode(functionName, exec, exec->dynamicGlobalObject()->debugger(), source, &errLine, &errMsg);
    if (!function)
        return throwError(exec, SyntaxError, errMsg, errLine, source.provider()->asID(), source.provider()->url());

    JSGlobalObject* globalObject = exec->lexicalGlobalObject();
    ScopeChain scopeChain(globalObject, globalObject->globalData(), globalObject, exec->globalThisValue());
    return new (exec) JSFunction(exec, function, scopeChain.node());
}

static void initializeOverrideInfo(const SourceCode& origCode, const String& newBody, FunctionOverrides::OverrideInfo& info)
{
    String origProviderStr = origCode.provider()->source();
    unsigned origBraceStart = origCode.startOffset();
    unsigned origFunctionStart = origProviderStr.reverseFind("function", origBraceStart);
    unsigned headerLength = origBraceStart - origFunctionStart;
    String origHeader = origProviderStr.substring(origFunctionStart, headerLength);

    String newProviderStr;
    newProviderStr.append(origHeader);
    newProviderStr.append(newBody);

    RefPtr<SourceProvider> newProvider = StringSourceProvider::create(newProviderStr, "<overridden>");

    info.firstLine = 1;
    info.lineCount = 1; // Faking it. This doesn't really matter for now.
    info.startColumn = 1;
    info.endColumn = 1; // Faking it. This doesn't really matter for now.
    info.parametersStartOffset = newProviderStr.find("(");
    info.typeProfilingStartOffset = newProviderStr.find("{");
    info.typeProfilingEndOffset = newProviderStr.length() - 1;

    info.sourceCode =
        SourceCode(newProvider.release(), info.typeProfilingStartOffset, info.typeProfilingEndOffset + 1, 1, 1);
}

PassOwnPtr<ScheduledAction> ScheduledAction::create(ExecState* exec, DOMWrapperWorld* isolatedWorld, ContentSecurityPolicy* policy)
{
    JSValue v = exec->argument(0);
    CallData callData;
    CallType callType = getCallData(v, callData);
    if (callType == CallTypeNone) {
        if (policy && !policy->allowEval())
            return nullptr;
        UString string = v.toString(exec)->value(exec);
        if (exec->hadException())
            return nullptr;
        return adoptPtr(new ScheduledAction(ustringToString(string), isolatedWorld));
    }

    // WebERA this calculates a unique indification of the called function scheduled in this action.

    if (callType == CallTypeJS) {
        const SourceCode source = callData.js.functionExecutable->source();
        WTF::String url = WebCore::decodeURLEscapeSequences(WTF::String(source.provider()->url().utf8().data()));

        uint calledLine = source.firstLine();

        return adoptPtr(new ScheduledAction(exec, v, isolatedWorld, url.ascii().data(), calledLine));
    }

    return adoptPtr(new ScheduledAction(exec, v, isolatedWorld, "<native-function>", -1));
}

// ECMA 15.3.2 The Function Constructor
JSObject* constructFunction(ExecState* exec, const ArgList& args, const Identifier& functionName, const UString& sourceURL, int lineNumber)
{
    UString program;
    if (args.isEmpty())
        program = "(function(){})";
    else if (args.size() == 1)
        program = "(function(){" + args.at(exec, 0)->toString(exec) + "})";
    else {
        program = "(function(" + args.at(exec, 0)->toString(exec);
        for (size_t i = 1; i < args.size() - 1; i++)
            program += "," + args.at(exec, i)->toString(exec);
        program += "){" + args.at(exec, args.size() - 1)->toString(exec) + "})";
    }

    int errLine;
    UString errMsg;
    SourceCode source = makeSource(program, sourceURL, lineNumber);
    RefPtr<ProgramNode> programNode = exec->globalData().parser->parse<ProgramNode>(exec, exec->dynamicGlobalObject()->debugger(), source, &errLine, &errMsg);

    FunctionBodyNode* body = functionBody(programNode.get());
    if (!body)
        return throwError(exec, SyntaxError, errMsg, errLine, source.provider()->asID(), source.provider()->url());

    JSGlobalObject* globalObject = exec->lexicalGlobalObject();
    ScopeChain scopeChain(globalObject, globalObject->globalData(), exec->globalThisValue());
    return new (exec) JSFunction(exec, functionName, body, scopeChain.node());
}

void Lexer::setCode(const SourceCode& source, ParserArena& arena)
{
    m_arena = &arena.identifierArena();

    m_lineNumber = source.firstLine();
    m_delimited = false;
    m_lastToken = -1;

    const UChar* data = source.provider()->data();

    m_source = &source;
    m_codeStart = data;
    m_code = data + source.startOffset();
    m_codeEnd = data + source.endOffset();
    m_error = false;
    m_atLineStart = true;

    m_buffer8.reserveInitialCapacity(initialReadBufferCapacity);
    m_buffer16.reserveInitialCapacity((m_codeEnd - m_code) / 2);

    if (LIKELY(m_code < m_codeEnd))
        m_current = *m_code;
    else
        m_current = -1;
    ASSERT(currentOffset() == source.startOffset());
}

ProgramExecutable::ProgramExecutable(ExecState* exec, const SourceCode& source)
    : ScriptExecutable(exec->vm().programExecutableStructure.get(), exec->vm(), source, false, DerivedContextType::None, false, EvalContextType::None, NoIntrinsic)
{
    ASSERT(source.provider()->sourceType() == SourceProviderSourceType::Program);
    m_typeProfilingStartOffset = 0;
    m_typeProfilingEndOffset = source.length() - 1;
    if (exec->vm().typeProfiler() || exec->vm().controlFlowProfiler())
        exec->vm().functionHasExecutedCache()->insertUnexecutedRange(sourceID(), m_typeProfilingStartOffset, m_typeProfilingEndOffset);
}

WASMModuleParser::WASMModuleParser(VM& vm, JSGlobalObject* globalObject, const SourceCode& source, JSObject* imports, JSArrayBuffer* arrayBuffer)
    : m_vm(vm)
    , m_globalObject(vm, globalObject)
    , m_source(source)
    , m_imports(vm, imports)
    , m_reader(static_cast<WebAssemblySourceProvider*>(source.provider())->data())
    , m_module(vm, JSWASMModule::create(vm, globalObject->wasmModuleStructure(), arrayBuffer))
{
}

JSValue* DebuggerCallFrame::evaluate(const UString& script, JSValue*& exception) const
{
    if (!m_callFrame->codeBlock())
        return noValue();

    int errLine;
    UString errMsg;
    SourceCode source = makeSource(script);
    RefPtr<EvalNode> evalNode = m_callFrame->scopeChain()->globalData->parser->parse<EvalNode>(m_callFrame, m_callFrame->dynamicGlobalObject()->debugger(), source, &errLine, &errMsg);
    if (!evalNode)
        return Error::create(m_callFrame, SyntaxError, errMsg, errLine, source.provider()->asID(), source.provider()->url());

    return m_callFrame->scopeChain()->globalData->interpreter->execute(evalNode.get(), m_callFrame, thisObject(), m_callFrame->scopeChain(), &exception);
}

void WebDebugListenerImpl::sourceParsed(ExecState* execState, const SourceCode& source, int errorLine, const UString& errorMsg)
{
    if (m_listener && !m_inDebug) {
        m_inDebug = true;

        WebCore::String coreSourceURL = WebCore::ustringToString(source.provider()->url());
        WebCore::Frame *frame = static_cast<WebCore::JSDOMWindow*>(execState->lexicalGlobalObject())->impl()->frame();
        if (!(coreSourceURL.isNull() || coreSourceURL.isEmpty())) {
            WebCore::KURL sourceURL(WebCore::ParsedURLString, coreSourceURL);
            WebCore::KURL mappedURL;
            if(WebCore::FrameLoaderClientApollo::mapFrameUrl(frame, sourceURL, &mappedURL)) {
                coreSourceURL = mappedURL.string();
            }
        }

        WebCore::String coreErrorMsg = WebCore::ustringToString(errorMsg);

        WebCore::String coreSource(source.data(), source.length());

        m_listener->m_pVTable->sourceParsed(m_listener, source.provider()->asID(), coreSourceURL.webString(), coreSource.webString(), source.firstLine(), errorLine, coreErrorMsg.webString());

        m_inDebug = false;
    }
}

FunctionExecutable* UnlinkedFunctionExecutable::link(VM& vm, const SourceCode& ownerSource, int overrideLineNumber)
{
    SourceCode source = m_sourceOverride ? SourceCode(m_sourceOverride) : ownerSource;
    unsigned firstLine = source.firstLine() + m_firstLineOffset;
    unsigned startOffset = source.startOffset() + m_startOffset;

    // Adjust to one-based indexing.
    bool startColumnIsOnFirstSourceLine = !m_firstLineOffset;
    unsigned startColumn = m_unlinkedBodyStartColumn + (startColumnIsOnFirstSourceLine ? source.startColumn() : 1);
    bool endColumnIsOnStartLine = !m_lineCount;
    unsigned endColumn = m_unlinkedBodyEndColumn + (endColumnIsOnStartLine ? startColumn : 1);

    SourceCode code(source.provider(), startOffset, startOffset + m_sourceLength, firstLine, startColumn);
    FunctionExecutable* result = FunctionExecutable::create(vm, code, this, firstLine, firstLine + m_lineCount, startColumn, endColumn);
    if (overrideLineNumber != -1)
        result->setOverrideLineNumber(overrideLineNumber);
    return result;
}

FunctionExecutable* UnlinkedFunctionExecutable::link(VM& vm, const SourceCode& ownerSource, Optional<int> overrideLineNumber, Intrinsic intrinsic)
{
    SourceCode source = m_sourceOverride ? SourceCode(m_sourceOverride) : ownerSource;
    unsigned firstLine = source.firstLine() + m_firstLineOffset;
    unsigned startOffset = source.startOffset() + m_startOffset;
    unsigned lineCount = m_lineCount;

    // Adjust to one-based indexing.
    bool startColumnIsOnFirstSourceLine = !m_firstLineOffset;
    unsigned startColumn = m_unlinkedBodyStartColumn + (startColumnIsOnFirstSourceLine ? source.startColumn() : 1);
    bool endColumnIsOnStartLine = !lineCount;
    unsigned endColumn = m_unlinkedBodyEndColumn + (endColumnIsOnStartLine ? startColumn : 1);

    SourceCode code(source.provider(), startOffset, startOffset + m_sourceLength, firstLine, startColumn);
    FunctionOverrides::OverrideInfo overrideInfo;
    bool hasFunctionOverride = false;

    if (UNLIKELY(Options::functionOverrides())) {
        hasFunctionOverride = FunctionOverrides::initializeOverrideFor(code, overrideInfo);
        if (hasFunctionOverride) {
            firstLine = overrideInfo.firstLine;
            lineCount = overrideInfo.lineCount;
            startColumn = overrideInfo.startColumn;
            endColumn = overrideInfo.endColumn;
            code = overrideInfo.sourceCode;
        }
    }

    FunctionExecutable* result = FunctionExecutable::create(vm, code, this, firstLine, firstLine + lineCount, startColumn, endColumn, intrinsic);
    if (overrideLineNumber)
        result->setOverrideLineNumber(*overrideLineNumber);

    if (UNLIKELY(hasFunctionOverride)) {
        result->overrideParameterAndTypeProfilingStartEndOffsets(
            overrideInfo.parametersStartOffset,
            overrideInfo.typeProfilingStartOffset,
            overrideInfo.typeProfilingEndOffset);
    }

    return result;
}

EvalExecutable::EvalExecutable(ExecState* exec, const SourceCode& source, bool inStrictContext, DerivedContextType derivedContextType, bool isArrowFunctionContext, EvalContextType evalContextType)
    : ScriptExecutable(exec->vm().evalExecutableStructure.get(), exec->vm(), source, inStrictContext, derivedContextType, isArrowFunctionContext, evalContextType, NoIntrinsic)
{
    ASSERT(source.provider()->sourceType() == SourceProviderSourceType::Program);
}

WASMModuleParser::WASMModuleParser(const SourceCode& source)
    : m_reader(static_cast<WebAssemblySourceProvider*>(source.provider())->data())
{
}