C++ MutableHandleFunction::environment方法代码示例

//.........这里部分代码省略.........
    fn->pn_cookie.makeFree();

    ParseNode *argsbody = ListNode::create(PNK_ARGSBODY, &parser.handler);
    if (!argsbody)
        return false;
    argsbody->setOp(JSOP_NOP);
    argsbody->makeEmpty();
    fn->pn_body = argsbody;

    Rooted<JSScript*> script(cx, JSScript::Create(cx, NullPtr(), false, options,
                                                  /* staticLevel = */ 0, sourceObject,
                                                  /* sourceStart = */ 0, length));
    if (!script)
        return false;

    // If the context is strict, immediately parse the body in strict
    // mode. Otherwise, we parse it normally. If we see a "use strict"
    // directive, we backup and reparse it as strict.
    TokenStream::Position start(parser.keepAtoms);
    parser.tokenStream.tell(&start);
    bool strict = StrictModeFromContext(cx);
    bool becameStrict;
    FunctionBox *funbox;
    ParseNode *pn;
    while (true) {
        pn = parser.standaloneFunctionBody(fun, formals, script, fn, &funbox,
                                           strict, &becameStrict);
        if (pn)
            break;

        if (parser.hadAbortedSyntaxParse()) {
            // Hit some unrecoverable ambiguity during an inner syntax parse.
            // Syntax parsing has now been disabled in the parser, so retry
            // the parse.
            parser.clearAbortedSyntaxParse();
        } else {
            // If the function became strict, reparse in strict mode.
            if (strict || !becameStrict || parser.tokenStream.hadError())
                return false;
            strict = true;
        }

        parser.tokenStream.seek(start);
    }

    if (!NameFunctions(cx, pn))
        return false;

    if (fn->pn_body) {
        JS_ASSERT(fn->pn_body->isKind(PNK_ARGSBODY));
        fn->pn_body->append(pn);
        fn->pn_body->pn_pos = pn->pn_pos;
        pn = fn->pn_body;
    }

    bool generateBytecode = true;
#ifdef JS_ION
    JS_ASSERT_IF(isAsmJSRecompile, fn->pn_funbox->useAsm);
    if (fn->pn_funbox->useAsm && !isAsmJSRecompile) {
        RootedFunction moduleFun(cx);
        if (!CompileAsmJS(cx, parser.tokenStream, fn, options,
                          ss, /* bufStart = */ 0, /* bufEnd = */ length,
                          &moduleFun))
            return false;

        if (moduleFun) {
            funbox->object = moduleFun;
            fun.set(moduleFun); // replace the existing function with the LinkAsmJS native
            generateBytecode = false;
        }
    }
#endif

    if (generateBytecode) {
        /*
         * The reason for checking fun->environment() below is that certain
         * consumers of JS::CompileFunction, namely
         * nsEventListenerManager::CompileEventHandlerInternal, passes in a
         * NULL environment. This compiled function is never used, but instead
         * is cloned immediately onto the right scope chain.
         */
        BytecodeEmitter funbce(/* parent = */ NULL, &parser, funbox, script,
                               /* insideEval = */ false, /* evalCaller = */ NullPtr(),
                               fun->environment() && fun->environment()->is<GlobalObject>(),
                               options.lineno);
        if (!funbce.init())
            return false;

        if (!EmitFunctionScript(cx, &funbce, pn))
            return false;
    }

    if (!SetSourceMap(cx, parser.tokenStream, ss, script))
        return false;

    if (!sct.complete())
        return false;

    return true;
}

//.........这里部分代码省略.........
    bool canLazilyParse = CanLazilyParse(cx, options);

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

    JS_ASSERT(!options.forEval);

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

    JS_ASSERT(fun);
    JS_ASSERT(fun->isTenured());

    fun->setArgCount(formals.length());

    // Speculatively parse using the default directives implied by the context.
    // If a directive is encountered (e.g., "use strict") that changes how the
    // function should have been parsed, we backup and reparse with the new set
    // of directives.
    Directives directives(options.strictOption);

    TokenStream::Position start(parser.keepAtoms);
    parser.tokenStream.tell(&start);

    ParseNode *fn;
    while (true) {
        Directives newDirectives = directives;
        fn = parser.standaloneFunctionBody(fun, formals, directives, &newDirectives);
        if (fn)
            break;

        if (parser.hadAbortedSyntaxParse()) {
            // Hit some unrecoverable ambiguity during an inner syntax parse.
            // Syntax parsing has now been disabled in the parser, so retry
            // the parse.
            parser.clearAbortedSyntaxParse();
        } else {
            if (parser.tokenStream.hadError() || directives == newDirectives)
                return false;

            // Assignment must be monotonic to prevent reparsing iloops
            JS_ASSERT_IF(directives.strict(), newDirectives.strict());
            JS_ASSERT_IF(directives.asmJS(), newDirectives.asmJS());
            directives = newDirectives;
        }

        parser.tokenStream.seek(start);
    }

    if (!NameFunctions(cx, fn))
        return false;

    if (fn->pn_funbox->function()->isInterpreted()) {
        JS_ASSERT(fun == fn->pn_funbox->function());

        Rooted<JSScript*> script(cx, JSScript::Create(cx, NullPtr(), false, options,
                                                      /* staticLevel = */ 0, sourceObject,
                                                      /* sourceStart = */ 0, length));
        if (!script)
            return false;

        script->bindings = fn->pn_funbox->bindings;

        /*
         * The reason for checking fun->environment() below is that certain
         * consumers of JS::CompileFunction, namely
         * nsEventListenerManager::CompileEventHandlerInternal, passes in a
         * NULL environment. This compiled function is never used, but instead
         * is cloned immediately onto the right scope chain.
         */
        BytecodeEmitter funbce(/* parent = */ NULL, &parser, fn->pn_funbox, script,
                               /* insideEval = */ false, /* evalCaller = */ NullPtr(),
                               fun->environment() && fun->environment()->is<GlobalObject>(),
                               options.lineno);
        if (!funbce.init())
            return false;

        if (!EmitFunctionScript(cx, &funbce, fn->pn_body))
            return false;
    } else {
        fun.set(fn->pn_funbox->function());
        JS_ASSERT(IsAsmJSModuleNative(fun->native()));
    }

    if (!SetSourceMap(cx, parser.tokenStream, ss))
        return false;

    if (!sct.complete())
        return false;

    return true;
}

//.........这里部分代码省略.........
                             /* foldConstants = */ false,
                             (Parser<SyntaxParseHandler> *) nullptr,
                             (LazyScript *) nullptr);
    }

    MOZ_ASSERT(!options.forEval);

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

    MOZ_ASSERT(fun);
    MOZ_ASSERT(fun->isTenured());

    fun->setArgCount(formals.length());

    // Speculatively parse using the default directives implied by the context.
    // If a directive is encountered (e.g., "use strict") that changes how the
    // function should have been parsed, we backup and reparse with the new set
    // of directives.
    Directives directives(options.strictOption);

    TokenStream::Position start(parser.keepAtoms);
    parser.tokenStream.tell(&start);

    ParseNode *fn;
    while (true) {
        Directives newDirectives = directives;
        fn = parser.standaloneFunctionBody(fun, formals, generatorKind, directives, &newDirectives);
        if (fn)
            break;

        if (parser.hadAbortedSyntaxParse()) {
            // Hit some unrecoverable ambiguity during an inner syntax parse.
            // Syntax parsing has now been disabled in the parser, so retry
            // the parse.
            parser.clearAbortedSyntaxParse();
        } else {
            if (parser.tokenStream.hadError() || directives == newDirectives)
                return false;

            // Assignment must be monotonic to prevent reparsing iloops
            MOZ_ASSERT_IF(directives.strict(), newDirectives.strict());
            MOZ_ASSERT_IF(directives.asmJS(), newDirectives.asmJS());
            directives = newDirectives;
        }

        parser.tokenStream.seek(start);
    }

    if (!NameFunctions(cx, fn))
        return false;

    if (!SetDisplayURL(cx, parser.tokenStream, ss))
        return false;

    if (!SetSourceMap(cx, parser.tokenStream, ss))
        return false;

    if (fn->pn_funbox->function()->isInterpreted()) {
        MOZ_ASSERT(fun == fn->pn_funbox->function());

        Rooted<JSScript*> script(cx, JSScript::Create(cx, enclosingScope, false, options,
                                                      /* staticLevel = */ 0, sourceObject,
                                                      /* sourceStart = */ 0, srcBuf.length()));
        if (!script)
            return false;

        script->bindings = fn->pn_funbox->bindings;

        /*
         * The reason for checking fun->environment() below is that certain
         * consumers of JS::CompileFunction, namely
         * EventListenerManager::CompileEventHandlerInternal, passes in a
         * nullptr environment. This compiled function is never used, but
         * instead is cloned immediately onto the right scope chain.
         */
        BytecodeEmitter funbce(/* parent = */ nullptr, &parser, fn->pn_funbox, script,
                               /* lazyScript = */ js::NullPtr(), /* insideEval = */ false,
                               /* evalCaller = */ js::NullPtr(),
                               fun->environment() && fun->environment()->is<GlobalObject>(),
                               options.lineno);
        if (!funbce.init())
            return false;

        if (!EmitFunctionScript(cx, &funbce, fn->pn_body))
            return false;
    } else {
        fun.set(fn->pn_funbox->function());
        MOZ_ASSERT(IsAsmJSModuleNative(fun->native()));
    }

    if (!sct.complete())
        return false;

    return true;
}