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

Example 11 with StatementListItem

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

the class DeclarationBindingInstantiation method EvalDeclarationInstantiation.

/**
 * 18.2.1.3 Runtime Semantics: EvalDeclarationInstantiation (body, varEnv, lexEnv, strict)
 *
 * @param cx
 *            the execution context
 * @param evalScript
 *            the global script to instantiate
 * @param varEnv
 *            the variable environment
 * @param lexEnv
 *            the lexical environment
 */
public static void EvalDeclarationInstantiation(ExecutionContext cx, Script evalScript, LexicalEnvironment<?> varEnv, LexicalEnvironment<DeclarativeEnvironmentRecord> lexEnv) {
    boolean strict = evalScript.isStrict();
    boolean nonStrictGlobal = !strict && evalScript.isGlobalCode() && !evalScript.isScripting();
    /* step 1 */
    Set<Name> varNames = VarDeclaredNames(evalScript);
    /* step 2 */
    List<StatementListItem> varDeclarations = VarScopedDeclarations(evalScript);
    /* step 3 (not applicable) */
    /* step 4 */
    EnvironmentRecord varEnvRec = varEnv.getEnvRec();
    assert !nonStrictGlobal || varEnvRec instanceof GlobalEnvironmentRecord : String.format("Unexpected environment record type: %s", varEnvRec);
    /* step 5 */
    if (!strict) {
        if (nonStrictGlobal) {
            /* step 5.a */
            GlobalEnvironmentRecord gEnvRec = (GlobalEnvironmentRecord) varEnvRec;
            for (Name name : varNames) {
                DeclarationOperations.canDeclareVarScopedOrThrow(cx, gEnvRec, name.getIdentifier());
            }
        }
        /* steps 5.b-d */
        if (!evalScript.isScripting() && !varNames.isEmpty() && isEnclosedByLexicalOrHasRestrictedVar(evalScript)) {
            checkLexicalRedeclaration(cx, varEnv, lexEnv, varNames);
        }
    }
    /* steps 6-8 (not applicable) */
    /* step 9 (note) */
    /* step 10 */
    LinkedHashSet<Name> declaredNames = new LinkedHashSet<>();
    /* step 11 */
    for (StatementListItem d : varDeclarations) {
        assert d instanceof VariableStatement;
        for (Name vn : BoundNames((VariableStatement) d)) {
            if (nonStrictGlobal) {
                GlobalEnvironmentRecord gEnvRec = (GlobalEnvironmentRecord) varEnvRec;
                DeclarationOperations.canDeclareGlobalVarOrThrow(cx, gEnvRec, vn.getIdentifier());
            }
            declaredNames.add(vn);
        }
    }
    /* steps 13-14 */
    assert LexicallyScopedDeclarations(evalScript).isEmpty();
    /* step 16 */
    for (Name vn : declaredNames) {
        if (nonStrictGlobal) {
            GlobalEnvironmentRecord gEnvRec = (GlobalEnvironmentRecord) varEnvRec;
            gEnvRec.createGlobalVarBinding(vn.getIdentifier(), true);
        } else {
            boolean bindingExists = varEnvRec.hasBinding(vn.getIdentifier());
            if (!bindingExists) {
                varEnvRec.createMutableBinding(vn.getIdentifier(), true);
                varEnvRec.initializeBinding(vn.getIdentifier(), UNDEFINED);
            }
        }
    }
/* step 17 (return) */
}

Example 12 with StatementListItem

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

the class GlobalDeclarationInstantiationGenerator method generate.

private void generate(Script script, GlobalDeclInitVisitor mv) {
    Variable<ExecutionContext> context = mv.getExecutionContext();
    Variable<LexicalEnvironment<GlobalEnvironmentRecord>> env = mv.newVariable("globalEnv", LexicalEnvironment.class).uncheckedCast();
    Variable<GlobalEnvironmentRecord> envRec = mv.newVariable("envRec", GlobalEnvironmentRecord.class);
    Variable<FunctionObject> fo = null;
    /* steps 1-2 */
    getLexicalEnvironment(context, env, mv);
    getEnvironmentRecord(env, envRec, mv);
    /* step 3 */
    HashSet<Name> lexNames = new HashSet<>();
    /* step 4 */
    HashSet<Name> varNames = new HashSet<>();
    // Iterate over declarations to be able to emit line-info entries.
    for (Declaration d : LexicallyScopedDeclarations(script)) {
        assert !(d instanceof HoistableDeclaration);
        for (Name name : BoundNames(d)) {
            if (lexNames.add(name)) {
                canDeclareLexicalScopedOrThrow(context, envRec, d, name, mv);
            }
        }
    }
    // Iterate over declarations to be able to emit line-info entries.
    for (StatementListItem item : VarScopedDeclarations(script)) {
        if (item instanceof VariableStatement) {
            for (VariableDeclaration vd : ((VariableStatement) item).getElements()) {
                for (Name name : BoundNames(vd)) {
                    if (varNames.add(name)) {
                        canDeclareVarScopedOrThrow(context, envRec, vd, name, mv);
                    }
                }
            }
        } else {
            HoistableDeclaration d = (HoistableDeclaration) item;
            Name name = BoundName(d);
            if (varNames.add(name)) {
                canDeclareVarScopedOrThrow(context, envRec, d, name, mv);
            }
        }
    }
    /* step 7 */
    List<StatementListItem> varDeclarations = VarScopedDeclarations(script);
    /* step 8 */
    ArrayDeque<HoistableDeclaration> functionsToInitialize = new ArrayDeque<>();
    /* step 9 */
    HashSet<Name> declaredFunctionNames = new HashSet<>();
    /* step 10 */
    for (StatementListItem item : reverse(varDeclarations)) {
        if (item instanceof HoistableDeclaration) {
            HoistableDeclaration d = (HoistableDeclaration) item;
            Name fn = BoundName(d);
            if (declaredFunctionNames.add(fn)) {
                canDeclareGlobalFunctionOrThrow(context, envRec, d, fn, mv);
                functionsToInitialize.addFirst(d);
            }
        }
    }
    if (!functionsToInitialize.isEmpty()) {
        fo = mv.newVariable("fo", FunctionObject.class);
    }
    /* step 11 */
    LinkedHashMap<Name, VariableDeclaration> declaredVarNames = new LinkedHashMap<>();
    /* step 12 */
    for (StatementListItem d : varDeclarations) {
        if (d instanceof VariableStatement) {
            for (VariableDeclaration vd : ((VariableStatement) d).getElements()) {
                for (Name vn : BoundNames(vd)) {
                    if (!declaredFunctionNames.contains(vn)) {
                        canDeclareGlobalVarOrThrow(context, envRec, vd, vn, mv);
                        declaredVarNames.put(vn, vd);
                    }
                }
            }
        }
    }
    // ES2016: Block-scoped global function declarations
    if (hasBlockFunctions(script)) {
        int idCounter = 0;
        HashSet<Name> declaredFunctionOrVarNames = new HashSet<>();
        declaredFunctionOrVarNames.addAll(declaredFunctionNames);
        declaredFunctionOrVarNames.addAll(declaredVarNames.keySet());
        for (FunctionDeclaration f : script.getScope().blockFunctions()) {
            Name fn = BoundName(f);
            Jump next = new Jump();
            // Runtime check always required for global block-level function declarations.
            f.setLegacyBlockScopeId(++idCounter);
            // FIXME: spec issue - avoid (observable!) duplicate checks for same name?
            // FIXME: spec issue - property creation order important?
            canDeclareGlobalFunction(envRec, f, fn, next, mv);
            setLegacyBlockFunction(context, f, mv);
            if (declaredFunctionOrVarNames.add(fn)) {
                createGlobalFunctionBinding(envRec, f, fn, false, mv);
            }
            mv.mark(next);
        }
    }
    /* step 15 */
    List<Declaration> lexDeclarations = LexicallyScopedDeclarations(script);
    /* step 16 */
    for (Declaration d : lexDeclarations) {
        assert !(d instanceof HoistableDeclaration);
        mv.lineInfo(d);
        for (Name dn : BoundNames(d)) {
            BindingOp<GlobalEnvironmentRecord> op = BindingOp.of(envRec, dn);
            if (d.isConstDeclaration()) {
                op.createImmutableBinding(envRec, dn, true, mv);
            } else {
                op.createMutableBinding(envRec, dn, false, mv);
            }
        }
    }
    /* step 17 */
    for (HoistableDeclaration f : functionsToInitialize) {
        Name fn = BoundName(f);
        InstantiateFunctionObject(context, env, f, mv);
        mv.store(fo);
        createGlobalFunctionBinding(envRec, f, fn, fo, false, mv);
    }
    /* step 18 */
    for (Map.Entry<Name, VariableDeclaration> e : declaredVarNames.entrySet()) {
        createGlobalVarBinding(envRec, e.getValue(), e.getKey(), false, mv);
    }
    /* step 19 */
    mv._return();
}