Examples with FormalParameterList com.github.anba.es6draft.ast.FormalParameterList used on opensource projects

Example 1 with FormalParameterList

use of com.github.anba.es6draft.ast.FormalParameterList in project es6draft by anba.

the class FunctionDeclarationInstantiationGenerator method generate.

private void generate(FunctionNode function, FunctionDeclInitVisitor mv) {
    Variable<ExecutionContext> context = mv.getExecutionContext();
    Variable<LexicalEnvironment<FunctionEnvironmentRecord>> env = mv.newVariable("env", LexicalEnvironment.class).uncheckedCast();
    Variable<FunctionEnvironmentRecord> envRec = mv.newVariable("envRec", FunctionEnvironmentRecord.class);
    Variable<FunctionObject> fo = null;
    Variable<Undefined> undefined = mv.newVariable("undef", Undefined.class);
    mv.loadUndefined();
    mv.store(undefined);
    FunctionScope fscope = function.getScope();
    boolean hasParameters = !function.getParameters().getFormals().isEmpty();
    Variable<Iterator<?>> iterator = null;
    if (hasParameters) {
        iterator = mv.newVariable("iterator", Iterator.class).uncheckedCast();
        mv.load(mv.getArguments());
        mv.invoke(Methods.Arrays_asList);
        mv.invoke(Methods.List_iterator);
        mv.store(iterator);
    }
    /* step 1 (omitted) */
    /* step 2 */
    getLexicalEnvironment(context, env, mv);
    /* step 3 */
    getEnvironmentRecord(env, envRec, mv);
    /* step 4 */
    // RuntimeInfo.Function code = func.getCode();
    /* step 5 */
    boolean strict = IsStrict(function);
    /* step 6 */
    FormalParameterList formals = function.getParameters();
    /* step 7 */
    ArrayList<Name> parameterNames = new ArrayList<>(BoundNames(formals));
    HashSet<Name> parameterNamesSet = new HashSet<>(parameterNames);
    /* step 8 */
    boolean hasDuplicates = parameterNames.size() != parameterNamesSet.size();
    /* step 9 */
    boolean simpleParameterList = IsSimpleParameterList(formals);
    /* step 10 */
    boolean hasParameterExpressions = ContainsExpression(formals);
    // invariant: hasDuplicates => simpleParameterList
    assert !hasDuplicates || simpleParameterList;
    // invariant: hasParameterExpressions => !simpleParameterList
    assert !hasParameterExpressions || !simpleParameterList;
    /* step 11 */
    Set<Name> varNames = VarDeclaredNames(function);
    /* step 12 */
    List<StatementListItem> varDeclarations = VarScopedDeclarations(function);
    /* step 13 */
    Set<Name> lexicalNames = LexicallyDeclaredNames(function);
    /* step 14 */
    HashSet<Name> functionNames = new HashSet<>();
    /* step 15 */
    ArrayDeque<HoistableDeclaration> functionsToInitialize = new ArrayDeque<>();
    /* step 16 */
    for (StatementListItem item : reverse(varDeclarations)) {
        if (item instanceof HoistableDeclaration) {
            HoistableDeclaration d = (HoistableDeclaration) item;
            Name fn = BoundName(d);
            if (functionNames.add(fn)) {
                functionsToInitialize.addFirst(d);
            }
        }
    }
    if (!functionsToInitialize.isEmpty()) {
        fo = mv.newVariable("fo", FunctionObject.class);
    }
    /* step 17 */
    // Optimization: Skip 'arguments' allocation if it's not referenced within the function.
    boolean argumentsObjectNeeded = function.getScope().needsArguments();
    Name arguments = function.getScope().arguments();
    argumentsObjectNeeded &= arguments != null;
    /* step 18 */
    if (function.getThisMode() == FunctionNode.ThisMode.Lexical) {
        argumentsObjectNeeded = false;
    } else /* step 19 */
    if (parameterNamesSet.contains(arguments)) {
        argumentsObjectNeeded = false;
    } else /* step 20 */
    if (!hasParameterExpressions) {
        if (functionNames.contains(arguments) || lexicalNames.contains(arguments)) {
            argumentsObjectNeeded = false;
        }
    }
    Variable<? extends LexicalEnvironment<? extends DeclarativeEnvironmentRecord>> paramsEnv;
    Variable<? extends DeclarativeEnvironmentRecord> paramsEnvRec;
    if (codegen.isEnabled(CompatibilityOption.SingleParameterEnvironment)) {
        assert hasParameterExpressions || fscope.parameterVarNames().isEmpty();
        if (hasParameterExpressions) {
            // Var-scoped bindings from do-expressions in parameter expressions.
            for (Name varName : fscope.parameterVarNames()) {
                BindingOp<DeclarativeEnvironmentRecord> op = BindingOp.of(envRec, varName);
                op.createMutableBinding(envRec, varName, false, mv);
                op.initializeBinding(envRec, varName, undefined, mv);
            }
            boolean hasParameterBindings = !parameterNames.isEmpty();
            assert fscope.parametersScope().isPresent() == (hasParameterBindings || argumentsObjectNeeded);
            if (hasParameterBindings || argumentsObjectNeeded) {
                paramsEnv = newDeclarativeEnvironment("paramsEnv", env, mv);
                paramsEnvRec = getDeclarativeEnvironmentRecord("paramsEnvRec", paramsEnv, mv);
                setLexicalEnvironment(paramsEnv, mv);
            } else {
                // Optimization: Skip environment allocation if no parameters are present.
                paramsEnv = env;
                paramsEnvRec = envRec;
            }
        } else {
            paramsEnv = env;
            paramsEnvRec = envRec;
        }
    } else {
        paramsEnv = env;
        paramsEnvRec = envRec;
    }
    if (fscope.parametersScope() != fscope) {
        mv.enterScope(fscope.parametersScope());
    }
    /* step 21 */
    for (Name paramName : function.getScope().parameterNames()) {
        BindingOp<DeclarativeEnvironmentRecord> op = BindingOp.of(paramsEnvRec, paramName);
        op.createMutableBinding(paramsEnvRec, paramName, false, mv);
        if (hasDuplicates) {
            op.initializeBinding(paramsEnvRec, paramName, undefined, mv);
        }
    }
    /* steps 22-23 */
    ArrayList<Name> parameterBindings;
    HashSet<Name> parameterBindingsSet;
    if (argumentsObjectNeeded) {
        /* step 22 */
        assert arguments != null;
        Variable<ArgumentsObject> argumentsObj = mv.newVariable("argumentsObj", ArgumentsObject.class);
        if (strict || !simpleParameterList) {
            CreateUnmappedArgumentsObject(mv);
        } else if (formals.getFormals().isEmpty()) {
            CreateMappedArgumentsObject(mv);
        } else {
            CreateMappedArgumentsObject(paramsEnvRec, formals, mv);
        }
        mv.store(argumentsObj);
        BindingOp<DeclarativeEnvironmentRecord> op = BindingOp.of(paramsEnvRec, arguments);
        if (strict) {
            op.createImmutableBinding(paramsEnvRec, arguments, false, mv);
        } else {
            op.createMutableBinding(paramsEnvRec, arguments, false, mv);
        }
        op.initializeBinding(paramsEnvRec, arguments, argumentsObj, mv);
        parameterBindings = new ArrayList<>(parameterNames);
        parameterBindings.add(arguments);
        parameterBindingsSet = new HashSet<>(parameterBindings);
    } else {
        /* step 23 */
        parameterBindings = parameterNames;
        parameterBindingsSet = parameterNamesSet;
    }
    /* steps 24-26 */
    if (hasParameters) {
        if (hasDuplicates) {
            /* step 24 */
            BindingInitialization(codegen, function, env, iterator, mv);
        } else {
            /* step 25 */
            BindingInitialization(codegen, function, env, paramsEnvRec, iterator, mv);
        }
    }
    /* steps 27-28 */
    HashSet<Name> instantiatedVarNames;
    Variable<? extends LexicalEnvironment<? extends DeclarativeEnvironmentRecord>> varEnv;
    Variable<? extends DeclarativeEnvironmentRecord> varEnvRec;
    if (!hasParameterExpressions) {
        assert fscope == fscope.variableScope();
        /* step 27.a (note) */
        /* step 27.b */
        instantiatedVarNames = new HashSet<>(parameterBindings);
        /* step 27.c */
        for (Name varName : varNames) {
            if (instantiatedVarNames.add(varName)) {
                BindingOp<FunctionEnvironmentRecord> op = BindingOp.of(envRec, varName);
                op.createMutableBinding(envRec, varName, false, mv);
                op.initializeBinding(envRec, varName, undefined, mv);
            }
        }
        /* steps 27.d-27.e */
        varEnv = env;
        varEnvRec = envRec;
    } else {
        assert fscope != fscope.variableScope();
        assert fscope.variableScope().isPresent();
        mv.enterScope(fscope.variableScope());
        /* step 28.a (note) */
        /* step 28.b */
        varEnv = newDeclarativeEnvironment("varEnv", paramsEnv, mv);
        /* step 28.c */
        varEnvRec = getDeclarativeEnvironmentRecord("varEnvRec", varEnv, mv);
        /* step 28.d */
        setVariableEnvironment(varEnv, mv);
        /* step 28.e */
        instantiatedVarNames = new HashSet<>();
        /* step 28.f */
        Variable<Object> tempValue = null;
        for (Name varName : varNames) {
            if (instantiatedVarNames.add(varName)) {
                BindingOp<DeclarativeEnvironmentRecord> op = BindingOp.of(varEnvRec, varName);
                op.createMutableBinding(varEnvRec, varName, false, mv);
                if (!parameterBindingsSet.contains(varName) || functionNames.contains(varName)) {
                    op.initializeBinding(varEnvRec, varName, undefined, mv);
                } else {
                    BindingOp<DeclarativeEnvironmentRecord> opp = BindingOp.of(paramsEnvRec, varName);
                    opp.getBindingValue(paramsEnvRec, varName, strict, mv);
                    if (tempValue == null) {
                        tempValue = mv.newVariable("tempValue", Object.class);
                    }
                    mv.store(tempValue);
                    op.initializeBinding(varEnvRec, varName, tempValue, mv);
                }
            }
        }
    }
    // FIXME: spec issue - wrong step reference in annexB
    for (Name fname : function.getScope().blockFunctionNames()) {
        // FIXME: spec bug - initial binding for "arguments" (https://github.com/tc39/ecma262/issues/991)
        if (instantiatedVarNames.add(fname)) {
            BindingOp<DeclarativeEnvironmentRecord> op = BindingOp.of(varEnvRec, fname);
            op.createMutableBinding(varEnvRec, fname, false, mv);
            if (!fname.getIdentifier().equals("arguments") || !argumentsObjectNeeded) {
                op.initializeBinding(varEnvRec, fname, undefined, mv);
            } else {
                BindingOp<DeclarativeEnvironmentRecord> opp = BindingOp.of(paramsEnvRec, fname);
                opp.getBindingValue(paramsEnvRec, fname, false, mv);
                Value<Object> tempValue = mv.storeTemporary(Object.class);
                op.initializeBinding(varEnvRec, fname, tempValue, mv);
            }
        }
    }
    /* steps 30-32 */
    Variable<? extends LexicalEnvironment<? extends DeclarativeEnvironmentRecord>> lexEnv;
    Variable<? extends DeclarativeEnvironmentRecord> lexEnvRec;
    assert strict || fscope.variableScope() != fscope.lexicalScope();
    if (!strict || fscope.variableScope() != fscope.lexicalScope()) {
        // NB: Scopes are unmodifiable once constructed, that means we need to emit the extra
        // scope for functions with deferred strict-ness, even if this scope is not present in
        // the specification.
        mv.enterScope(fscope.lexicalScope());
        assert fscope.lexicalScope().isPresent() == !lexicalNames.isEmpty();
        if (!lexicalNames.isEmpty()) {
            /* step 30 */
            lexEnv = newDeclarativeEnvironment("lexEnv", varEnv, mv);
            /* step 32 */
            lexEnvRec = getDeclarativeEnvironmentRecord("lexEnvRec", lexEnv, mv);
        } else {
            // Optimization: Skip environment allocation if no lexical names are defined.
            /* step 30 */
            lexEnv = varEnv;
            /* step 32 */
            lexEnvRec = varEnvRec;
        }
    } else {
        /* step 30 */
        lexEnv = varEnv;
        /* step 32 */
        lexEnvRec = varEnvRec;
    }
    /* step 33 */
    if (lexEnv != env) {
        setLexicalEnvironment(lexEnv, mv);
    }
    /* step 34 */
    List<Declaration> lexDeclarations = LexicallyScopedDeclarations(function);
    /* step 35 */
    for (Declaration d : lexDeclarations) {
        assert !(d instanceof HoistableDeclaration);
        for (Name dn : BoundNames(d)) {
            BindingOp<DeclarativeEnvironmentRecord> op = BindingOp.of(lexEnvRec, dn);
            if (d.isConstDeclaration()) {
                op.createImmutableBinding(lexEnvRec, dn, true, mv);
            } else {
                op.createMutableBinding(lexEnvRec, dn, false, mv);
            }
        }
    }
    /* step 36 */
    for (HoistableDeclaration f : functionsToInitialize) {
        Name fn = BoundName(f);
        // stack: [] -> [fo]
        InstantiateFunctionObject(context, lexEnv, f, mv);
        mv.store(fo);
        // stack: [fo] -> []
        // Resolve the actual binding name: function(a){ function a(){} }
        // TODO: Can be removed when StaticIdResolution handles this case.
        Name name = fscope.variableScope().resolveName(fn);
        BindingOp<DeclarativeEnvironmentRecord> op = BindingOp.of(varEnvRec, name);
        op.setMutableBinding(varEnvRec, name, fo, false, mv);
    }
    /* step 37 */
    mv._return();
}