C++ JSFunction::generatorKind方法代码示例

//.........这里部分代码省略.........
    // reset when this occurs.
    Maybe<ParseContext<FullParseHandler> > pc;

    pc.construct(&parser, (GenericParseContext *) nullptr, (ParseNode *) nullptr, &globalsc,
                 (Directives *) nullptr, staticLevel, /* bodyid = */ 0);
    if (!pc.ref().init(parser.tokenStream))
        return nullptr;

    /* If this is a direct call to eval, inherit the caller's strictness.  */
    if (evalCaller && evalCaller->strict)
        globalsc.strict = true;

    if (options.compileAndGo) {
        if (source) {
            /*
             * Save eval program source in script->atoms[0] for the
             * eval cache (see EvalCacheLookup in jsobj.cpp).
             */
            JSAtom *atom = AtomizeString<CanGC>(cx, source);
            jsatomid _;
            if (!atom || !bce.makeAtomIndex(atom, &_))
                return nullptr;
        }

        if (evalCaller && evalCaller->functionOrCallerFunction()) {
            /*
             * An eval script in a caller frame needs to have its enclosing
             * function captured in case it refers to an upvar, and someone
             * wishes to decompile it while it's running.
             */
            JSFunction *fun = evalCaller->functionOrCallerFunction();
            Directives directives(/* strict = */ fun->strict());
            ObjectBox *funbox = parser.newFunctionBox(/* fn = */ nullptr, fun, pc.addr(),
                                                      directives, fun->generatorKind());
            if (!funbox)
                return nullptr;
            bce.objectList.add(funbox);
        }
    }

    bool canHaveDirectives = true;
    for (;;) {
        TokenKind tt = parser.tokenStream.peekToken(TokenStream::Operand);
        if (tt <= TOK_EOF) {
            if (tt == TOK_EOF)
                break;
            JS_ASSERT(tt == TOK_ERROR);
            return nullptr;
        }

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

        ParseNode *pn = parser.statement(canHaveDirectives);
        if (!pn) {
            if (parser.hadAbortedSyntaxParse()) {
                // Parsing inner functions lazily may lead the parser into an
                // unrecoverable state and may require starting over on the top
                // level statement. Restart the parse; syntax parsing has
                // already been disabled for the parser and the result will not
                // be ambiguous.
                parser.clearAbortedSyntaxParse();
                parser.tokenStream.seek(pos);

                // Destroying the parse context will destroy its free
                // variables, so check if any deoptimization is needed.

//.........这里部分代码省略.........

    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))
        return nullptr;

    /* If this is a direct call to eval, inherit the caller's strictness.  */
    if (evalCaller && evalCaller->strict())
        globalsc.strict = true;

    if (options.compileAndGo && evalCaller && evalCaller->functionOrCallerFunction()) {
        /*
         * An eval script in a caller frame needs to have its enclosing
         * function captured in case it refers to an upvar, and someone
         * wishes to decompile it while it's running.
         */
        JSFunction *fun = evalCaller->functionOrCallerFunction();
        Directives directives(/* strict = */ fun->strict());
        ObjectBox *funbox = parser.newFunctionBox(/* fn = */ nullptr, fun, pc.ptr(),
                                                  directives, fun->generatorKind());
        if (!funbox)
            return nullptr;
        bce.objectList.add(funbox);
    }

    bool canHaveDirectives = true;
    for (;;) {
        TokenKind tt;
        if (!parser.tokenStream.peekToken(&tt, TokenStream::Operand))
            return nullptr;
        if (tt == TOK_EOF)
            break;

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

        ParseNode *pn = parser.statement(canHaveDirectives);
        if (!pn) {
            if (parser.hadAbortedSyntaxParse()) {
                // Parsing inner functions lazily may lead the parser into an
                // unrecoverable state and may require starting over on the top
                // level statement. Restart the parse; syntax parsing has
                // already been disabled for the parser and the result will not
                // be ambiguous.
                parser.clearAbortedSyntaxParse();
                parser.tokenStream.seek(pos);

                // Destroying the parse context will destroy its free
                // variables, so check if any deoptimization is needed.
                if (!MaybeCheckEvalFreeVariables(cx, evalCaller, scopeChain, parser, *pc))
                    return nullptr;