C++ SourceCompressionTask类代码示例

SourceCompressionTask*
GlobalHelperThreadState::compressionTaskForSource(ScriptSource* ss)
{
    MOZ_ASSERT(isLocked());
    for (size_t i = 0; i < compressionWorklist().length(); i++) {
        SourceCompressionTask* task = compressionWorklist()[i];
        if (task->source() == ss)
            return task;
    }
    for (size_t i = 0; i < threadCount; i++) {
        SourceCompressionTask* task = threads[i].compressionTask();
        if (task && task->source() == ss)
            return task;
    }
    return nullptr;
}

JSScript *
frontend::CompileScript(ExclusiveContext *cx, LifoAlloc *alloc, HandleObject scopeChain,
                        HandleScript evalCaller,
                        const CompileOptions &options,
                        const jschar *chars, size_t length,
                        JSString *source_ /* = nullptr */,
                        unsigned staticLevel /* = 0 */,
                        SourceCompressionTask *extraSct /* = nullptr */)
{
    RootedString source(cx, source_);
    SkipRoot skip(cx, &chars);

#if JS_TRACE_LOGGING
        js::AutoTraceLog logger(js::TraceLogging::defaultLogger(),
                                js::TraceLogging::PARSER_COMPILE_SCRIPT_START,
                                js::TraceLogging::PARSER_COMPILE_SCRIPT_STOP,
                                options);
#endif

    if (cx->isJSContext())
        MaybeCallSourceHandler(cx->asJSContext(), options, chars, length);

    /*
     * The scripted callerFrame can only be given for compile-and-go scripts
     * and non-zero static level requires callerFrame.
     */
    JS_ASSERT_IF(evalCaller, options.compileAndGo);
    JS_ASSERT_IF(evalCaller, options.forEval);
    JS_ASSERT_IF(staticLevel != 0, evalCaller);

    if (!CheckLength(cx, length))
        return nullptr;
    JS_ASSERT_IF(staticLevel != 0, options.sourcePolicy != CompileOptions::LAZY_SOURCE);
    ScriptSource *ss = cx->new_<ScriptSource>(options.originPrincipals());
    if (!ss)
        return nullptr;
    if (options.filename && !ss->setFilename(cx, options.filename))
        return nullptr;

    RootedScriptSource sourceObject(cx, ScriptSourceObject::create(cx, ss));
    if (!sourceObject)
        return nullptr;

    SourceCompressionTask mysct(cx);
    SourceCompressionTask *sct = extraSct ? extraSct : &mysct;

    switch (options.sourcePolicy) {
      case CompileOptions::SAVE_SOURCE:
        if (!ss->setSourceCopy(cx, chars, length, false, sct))
            return nullptr;
        break;
      case CompileOptions::LAZY_SOURCE:
        ss->setSourceRetrievable();
        break;
      case CompileOptions::NO_SOURCE:
        break;
    }

    bool canLazilyParse = CanLazilyParse(cx, options);

    Maybe<Parser<SyntaxParseHandler> > syntaxParser;
    if (canLazilyParse) {
        syntaxParser.construct(cx, alloc, options, chars, length, /* foldConstants = */ false,
                               (Parser<SyntaxParseHandler> *) nullptr,
                               (LazyScript *) nullptr);
    }

    Parser<FullParseHandler> parser(cx, alloc, options, chars, length, /* foldConstants = */ true,
                                    canLazilyParse ? &syntaxParser.ref() : nullptr, nullptr);
    parser.sct = sct;
    parser.ss = ss;

    Directives directives(options.strictOption);
    GlobalSharedContext globalsc(cx, scopeChain, directives, options.extraWarningsOption);

    bool savedCallerFun =
        options.compileAndGo &&
        evalCaller &&
        (evalCaller->function() || evalCaller->savedCallerFun);
    Rooted<JSScript*> script(cx, JSScript::Create(cx, NullPtr(), savedCallerFun,
                                                  options, staticLevel, sourceObject, 0, length));
    if (!script)
        return nullptr;

    // Global/eval script bindings are always empty (all names are added to the
    // scope dynamically via JSOP_DEFFUN/VAR).
    InternalHandle<Bindings*> bindings(script, &script->bindings);
    if (!Bindings::initWithTemporaryStorage(cx, bindings, 0, 0, nullptr))
        return nullptr;

    // We can specialize a bit for the given scope chain if that scope chain is the global object.
    JSObject *globalScope =
        scopeChain && scopeChain == &scopeChain->global() ? (JSObject*) scopeChain : nullptr;
    JS_ASSERT_IF(globalScope, globalScope->isNative());
    JS_ASSERT_IF(globalScope, JSCLASS_HAS_GLOBAL_FLAG_AND_SLOTS(globalScope->getClass()));

    BytecodeEmitter::EmitterMode emitterMode =
        options.selfHostingMode ? BytecodeEmitter::SelfHosting : BytecodeEmitter::Normal;
    BytecodeEmitter bce(/* parent = */ nullptr, &parser, &globalsc, script, options.forEval,
                        evalCaller, !!globalScope, options.lineno, emitterMode);
//.........这里部分代码省略.........

JSScript *
frontend::CompileScript(ExclusiveContext *cx, LifoAlloc *alloc, HandleObject scopeChain,
                        HandleScript evalCaller,
                        const ReadOnlyCompileOptions &options,
                        SourceBufferHolder &srcBuf,
                        JSString *source_ /* = nullptr */,
                        unsigned staticLevel /* = 0 */,
                        SourceCompressionTask *extraSct /* = nullptr */)
{
    MOZ_ASSERT(srcBuf.get());

    RootedString source(cx, source_);

    js::TraceLogger *logger = nullptr;
    if (cx->isJSContext())
        logger = TraceLoggerForMainThread(cx->asJSContext()->runtime());
    else
        logger = TraceLoggerForCurrentThread();
    uint32_t logId = js::TraceLogCreateTextId(logger, options);
    js::AutoTraceLog scriptLogger(logger, logId);
    js::AutoTraceLog typeLogger(logger, TraceLogger::ParserCompileScript);

    /*
     * The scripted callerFrame can only be given for compile-and-go scripts
     * and non-zero static level requires callerFrame.
     */
    MOZ_ASSERT_IF(evalCaller, options.compileAndGo);
    MOZ_ASSERT_IF(evalCaller, options.forEval);
    MOZ_ASSERT_IF(staticLevel != 0, evalCaller);

    if (!CheckLength(cx, srcBuf))
        return nullptr;
    MOZ_ASSERT_IF(staticLevel != 0, !options.sourceIsLazy);

    RootedScriptSource sourceObject(cx, CreateScriptSourceObject(cx, options));
    if (!sourceObject)
        return nullptr;

    ScriptSource *ss = sourceObject->source();

    SourceCompressionTask mysct(cx);
    SourceCompressionTask *sct = extraSct ? extraSct : &mysct;

    if (!cx->compartment()->options().discardSource()) {
        if (options.sourceIsLazy)
            ss->setSourceRetrievable();
        else if (!ss->setSourceCopy(cx, srcBuf, false, sct))
            return nullptr;
    }

    bool canLazilyParse = CanLazilyParse(cx, options);

    Maybe<Parser<SyntaxParseHandler> > syntaxParser;
    if (canLazilyParse) {
        syntaxParser.emplace(cx, alloc, options, srcBuf.get(), srcBuf.length(),
                             /* foldConstants = */ false,
                             (Parser<SyntaxParseHandler> *) nullptr,
                             (LazyScript *) nullptr);
    }

    Parser<FullParseHandler> parser(cx, alloc, options, srcBuf.get(), srcBuf.length(),
                                    /* foldConstants = */ true,
                                    canLazilyParse ? syntaxParser.ptr() : nullptr, nullptr);
    parser.sct = sct;
    parser.ss = ss;

    Directives directives(options.strictOption);
    GlobalSharedContext globalsc(cx, scopeChain, directives, options.extraWarningsOption);

    bool savedCallerFun = options.compileAndGo &&
                          evalCaller && evalCaller->functionOrCallerFunction();
    Rooted<JSScript*> script(cx, JSScript::Create(cx, NullPtr(), savedCallerFun,
                                                  options, staticLevel, sourceObject, 0,
                                                  srcBuf.length()));
    if (!script)
        return nullptr;

    // We can specialize a bit for the given scope chain if that scope chain is the global object.
    JSObject *globalScope =
        scopeChain && scopeChain == &scopeChain->global() ? (JSObject*) scopeChain : nullptr;
    MOZ_ASSERT_IF(globalScope, globalScope->isNative());
    MOZ_ASSERT_IF(globalScope, JSCLASS_HAS_GLOBAL_FLAG_AND_SLOTS(globalScope->getClass()));

    BytecodeEmitter::EmitterMode emitterMode =
        options.selfHostingMode ? BytecodeEmitter::SelfHosting : BytecodeEmitter::Normal;
    BytecodeEmitter bce(/* parent = */ nullptr, &parser, &globalsc, script,
                        /* lazyScript = */ js::NullPtr(), options.forEval,
                        evalCaller, !!globalScope, options.lineno, emitterMode);
    if (!bce.init())
        return nullptr;

    // Syntax parsing may cause us to restart processing of top level
    // statements in the script. Use Maybe<> so that the parse context can be
    // reset when this occurs.
    Maybe<ParseContext<FullParseHandler> > pc;

    pc.emplace(&parser, (GenericParseContext *) nullptr, (ParseNode *) nullptr, &globalsc,
               (Directives *) nullptr, staticLevel, /* bodyid = */ 0,
               /* blockScopeDepth = */ 0);
    if (!pc->init(parser.tokenStream))
//.........这里部分代码省略.........