Examples with ExecutionContext com.github.anba.es6draft.runtime.ExecutionContext used on opensource projects

Example 51 with ExecutionContext

use of com.github.anba.es6draft.runtime.ExecutionContext in project es6draft by anba.

the class GlobalDeclarationInstantiationGenerator method generate.

private void generate(Script script, InstructionVisitor mv) {
    Variable<ExecutionContext> context = mv.getParameter(EXECUTION_CONTEXT, ExecutionContext.class);
    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 14 */
    List<Declaration> lexDeclarations = LexicallyScopedDeclarations(script);
    /* step 15 */
    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 16 */
    for (HoistableDeclaration f : functionsToInitialize) {
        Name fn = BoundName(f);
        InstantiateFunctionObject(context, env, f, mv);
        mv.store(fo);
        createGlobalFunctionBinding(envRec, f, fn, fo, false, mv);
    }
    /* step 17 */
    for (Map.Entry<Name, VariableDeclaration> e : declaredVarNames.entrySet()) {
        createGlobalVarBinding(envRec, e.getValue(), e.getKey(), false, mv);
    }
    /* step 18 */
    mv._return();
}

Example 52 with ExecutionContext

use of com.github.anba.es6draft.runtime.ExecutionContext in project es6draft by anba.

the class ModuleDeclarationInstantiationGenerator method generate.

private void generate(Module module, SourceTextModuleRecord moduleRecord, InstructionVisitor mv) {
    Variable<ExecutionContext> context = mv.getParameter(EXECUTION_CONTEXT, ExecutionContext.class);
    Variable<SourceTextModuleRecord> moduleRec = mv.getParameter(MODULE, SourceTextModuleRecord.class);
    Variable<LexicalEnvironment<ModuleEnvironmentRecord>> env = mv.getParameter(MODULE_ENV, LexicalEnvironment.class).uncheckedCast();
    Variable<ModuleEnvironmentRecord> envRec = mv.newVariable("envRec", ModuleEnvironmentRecord.class);
    getEnvironmentRecord(env, envRec, mv);
    Variable<ModuleExport> resolved = mv.newVariable("resolved", ModuleExport.class);
    Variable<ScriptObject> namespace = null;
    Variable<FunctionObject> fo = null;
    Variable<Undefined> undef = mv.newVariable("undef", Undefined.class);
    mv.loadUndefined();
    mv.store(undef);
    /* step 9 */
    for (ExportEntry exportEntry : moduleRecord.getIndirectExportEntries()) {
        mv.lineInfo(exportEntry.getLine());
        mv.load(moduleRec);
        mv.aconst(exportEntry.getExportName());
        mv.invoke(Methods.ScriptRuntime_resolveExportOrThrow);
    }
    /* step 12 */
    for (ImportEntry importEntry : moduleRecord.getImportEntries()) {
        mv.lineInfo(importEntry.getLine());
        if (importEntry.isStarImport()) {
            Name localName = new Name(importEntry.getLocalName());
            BindingOp<ModuleEnvironmentRecord> op = BindingOp.of(envRec, localName);
            op.createImmutableBinding(envRec, localName, true, mv);
            mv.load(context);
            mv.load(moduleRec);
            mv.aconst(importEntry.getModuleRequest());
            mv.invoke(Methods.ScriptRuntime_getModuleNamespace);
            if (namespace == null) {
                namespace = mv.newVariable("namespace", ScriptObject.class);
            }
            mv.store(namespace);
            op.initializeBinding(envRec, localName, namespace, mv);
        } else {
            mv.load(moduleRec);
            mv.aconst(importEntry.getModuleRequest());
            mv.aconst(importEntry.getImportName());
            mv.invoke(Methods.ScriptRuntime_resolveImportOrThrow);
            mv.store(resolved);
            createImportBinding(context, envRec, importEntry.getLocalName(), resolved, mv);
        }
    }
    /* step 13 */
    List<StatementListItem> varDeclarations = VarScopedDeclarations(module);
    HashSet<Name> declaredVarNames = new HashSet<>();
    /* step 14 */
    for (StatementListItem d : varDeclarations) {
        assert d instanceof VariableStatement;
        for (Name dn : BoundNames((VariableStatement) d)) {
            if (declaredVarNames.add(dn)) {
                BindingOp<ModuleEnvironmentRecord> op = BindingOp.of(envRec, dn);
                op.createMutableBinding(envRec, dn, false, mv);
                op.initializeBinding(envRec, dn, undef, mv);
            }
        }
    }
    /* step 15 */
    List<Declaration> lexDeclarations = LexicallyScopedDeclarations(module);
    /* step 16 */
    for (Declaration d : lexDeclarations) {
        for (Name dn : BoundNames(d)) {
            BindingOp<ModuleEnvironmentRecord> op = BindingOp.of(envRec, dn);
            if (d.isConstDeclaration()) {
                op.createImmutableBinding(envRec, dn, true, mv);
            } else {
                op.createMutableBinding(envRec, dn, false, mv);
            }
            if (d instanceof HoistableDeclaration) {
                InstantiateFunctionObject(context, env, d, mv);
                if (fo == null) {
                    fo = mv.newVariable("fo", FunctionObject.class);
                }
                mv.store(fo);
                op.initializeBinding(envRec, dn, fo, mv);
            }
        }
    }
    /* step 17 */
    mv._return();
}

Example 53 with ExecutionContext

use of com.github.anba.es6draft.runtime.ExecutionContext in project es6draft by anba.

the class ScriptCodeGenerator method generateGlobalScriptEvaluation.

/**
     * 15.1.7 Runtime Semantics: ScriptEvaluation
     * 
     * @param node
     *            the script node
     * @param mv
     *            the instruction visitor
     */
private void generateGlobalScriptEvaluation(Script node, InstructionVisitor mv) {
    Variable<ExecutionContext> callerContext = mv.getParameter(EXECUTION_CONTEXT, ExecutionContext.class);
    Variable<com.github.anba.es6draft.Script> script = mv.getParameter(SCRIPT, com.github.anba.es6draft.Script.class);
    Variable<Realm> realm = mv.newVariable("realm", Realm.class);
    Variable<ExecutionContext> scriptCxt = mv.newVariable("scriptCxt", ExecutionContext.class);
    Variable<ExecutionContext> oldScriptContext = mv.newVariable("oldScriptContext", ExecutionContext.class);
    Variable<Object> result = mv.newVariable("result", Object.class);
    Variable<Throwable> throwable = mv.newVariable("throwable", Throwable.class);
    getRealm(callerContext, realm, mv);
    /* steps 1-2 (not applicable) */
    /* steps 3-7 */
    newScriptExecutionContext(realm, script, scriptCxt, mv);
    /* step 8 */
    getScriptContext(realm, oldScriptContext, mv);
    /* step 9 */
    setScriptContext(realm, scriptCxt, mv);
    TryCatchLabel startFinally = new TryCatchLabel(), endFinally = new TryCatchLabel();
    TryCatchLabel handlerFinally = new TryCatchLabel();
    mv.mark(startFinally);
    {
        /* step 10 */
        mv.load(scriptCxt);
        mv.invoke(codegen.methodDesc(node, ScriptName.Init));
        /* steps 11-12 */
        mv.load(scriptCxt);
        mv.invoke(codegen.methodDesc(node, ScriptName.Code));
        mv.store(result);
        /* steps 13-15  */
        setScriptContext(realm, oldScriptContext, mv);
        /* step 16 */
        mv.load(result);
        mv._return();
    }
    mv.mark(endFinally);
    // Exception: Restore script context and then rethrow exception
    mv.finallyHandler(handlerFinally);
    mv.store(throwable);
    /* steps 13-15 */
    setScriptContext(realm, oldScriptContext, mv);
    mv.load(throwable);
    mv.athrow();
    mv.tryFinally(startFinally, endFinally, handlerFinally);
}

Example 54 with ExecutionContext

use of com.github.anba.es6draft.runtime.ExecutionContext in project es6draft by anba.

the class EvalDeclarationInstantiationGenerator method generateStrict.

private void generateStrict(Script evalScript, InstructionVisitor mv) {
    assert evalScript.isStrict() && !evalScript.isScripting();
    Variable<ExecutionContext> context = mv.getParameter(EXECUTION_CONTEXT, ExecutionContext.class);
    Variable<LexicalEnvironment<DeclarativeEnvironmentRecord>> varEnv = mv.newVariable("varEnv", LexicalEnvironment.class).uncheckedCast();
    Variable<LexicalEnvironment<DeclarativeEnvironmentRecord>> lexEnv = mv.newVariable("lexEnv", LexicalEnvironment.class).uncheckedCast();
    Variable<FunctionObject> fo = null;
    Variable<Undefined> undef = mv.newVariable("undef", Undefined.class);
    mv.loadUndefined();
    mv.store(undef);
    getVariableEnvironment(context, varEnv, mv);
    getLexicalEnvironment(context, lexEnv, mv);
    /* step 1 */
    Set<Name> varNames = VarDeclaredNames(evalScript);
    /* step 2 */
    List<StatementListItem> varDeclarations = VarScopedDeclarations(evalScript);
    /* step 3 */
    Variable<DeclarativeEnvironmentRecord> lexEnvRec = mv.newVariable("lexEnvRec", DeclarativeEnvironmentRecord.class);
    getEnvironmentRecord(lexEnv, lexEnvRec, mv);
    /* step 4 */
    Variable<DeclarativeEnvironmentRecord> varEnvRec = mv.newVariable("varEnvRec", DeclarativeEnvironmentRecord.class);
    getEnvironmentRecord(varEnv, varEnvRec, mv);
    /* step 5 (not applicable) */
    /* step 6 */
    ArrayDeque<HoistableDeclaration> functionsToInitialize = new ArrayDeque<>();
    /* step 7 */
    HashSet<Name> declaredFunctionNames = new HashSet<>();
    /* step 8 */
    if (findFunctionDeclarations(varDeclarations, functionsToInitialize, declaredFunctionNames)) {
        fo = mv.newVariable("fo", FunctionObject.class);
    }
    /* step 9 */
    LinkedHashSet<Name> declaredVarNames = new LinkedHashSet<>(varNames);
    /* step 10 */
    declaredVarNames.removeAll(declaredFunctionNames);
    // ES2016: Block-scoped global function declarations
    assert !hasBlockFunctions(evalScript);
    /* step 12 */
    List<Declaration> lexDeclarations = LexicallyScopedDeclarations(evalScript);
    /* step 13 */
    createLexicalDeclarations(lexDeclarations, lexEnvRec, mv);
    /* step 14 */
    for (HoistableDeclaration f : functionsToInitialize) {
        Name fn = BoundName(f);
        // stack: [] -> []
        InstantiateFunctionObject(context, lexEnv, f, mv);
        mv.store(fo);
        // Early error semantics ensure that fn does not already exist in varEnvRec.
        BindingOp<DeclarativeEnvironmentRecord> op = BindingOp.of(varEnvRec, fn);
        op.createMutableBinding(varEnvRec, fn, true, mv);
        op.initializeBinding(varEnvRec, fn, fo, mv);
    }
    /* step 15 */
    for (Name vn : declaredVarNames) {
        // Early error semantics ensure that vn does not already exist in varEnvRec.
        BindingOp<DeclarativeEnvironmentRecord> op = BindingOp.of(varEnvRec, vn);
        op.createMutableBinding(varEnvRec, vn, true, mv);
        op.initializeBinding(varEnvRec, vn, undef, mv);
    }
    /* step 16 */
    mv._return();
}

Example 55 with ExecutionContext

use of com.github.anba.es6draft.runtime.ExecutionContext in project es6draft by anba.

the class EvalDeclarationInstantiationGenerator method generateGlobal.

private void generateGlobal(Script evalScript, InstructionVisitor mv) {
    assert evalScript.isGlobalCode() && !evalScript.isStrict() && !evalScript.isScripting();
    Variable<ExecutionContext> context = mv.getParameter(EXECUTION_CONTEXT, ExecutionContext.class);
    Variable<LexicalEnvironment<GlobalEnvironmentRecord>> varEnv = mv.newVariable("varEnv", LexicalEnvironment.class).uncheckedCast();
    Variable<LexicalEnvironment<DeclarativeEnvironmentRecord>> lexEnv = mv.newVariable("lexEnv", LexicalEnvironment.class).uncheckedCast();
    Variable<FunctionObject> fo = null;
    getVariableEnvironment(context, varEnv, mv);
    getLexicalEnvironment(context, lexEnv, mv);
    /* step 1 */
    Set<Name> varNames = VarDeclaredNames(evalScript);
    /* step 2 */
    List<StatementListItem> varDeclarations = VarScopedDeclarations(evalScript);
    /* step 3 */
    Variable<DeclarativeEnvironmentRecord> lexEnvRec = mv.newVariable("lexEnvRec", DeclarativeEnvironmentRecord.class);
    /* step 4 */
    Variable<GlobalEnvironmentRecord> varEnvRec = mv.newVariable("varEnvRec", GlobalEnvironmentRecord.class);
    getEnvironmentRecord(varEnv, varEnvRec, mv);
    /* step 5 */
    if (!varNames.isEmpty()) {
        /* step 5.a */
        // Iterate over declarations to be able to emit line-info entries.
        HashSet<Name> checkedVarNames = new HashSet<>();
        for (StatementListItem item : VarScopedDeclarations(evalScript)) {
            if (item instanceof VariableStatement) {
                for (VariableDeclaration vd : ((VariableStatement) item).getElements()) {
                    for (Name name : BoundNames(vd)) {
                        if (checkedVarNames.add(name)) {
                            canDeclareVarScopedOrThrow(context, varEnvRec, vd, name, mv);
                        }
                    }
                }
            } else {
                HoistableDeclaration d = (HoistableDeclaration) item;
                Name name = BoundName(d);
                if (checkedVarNames.add(name)) {
                    canDeclareVarScopedOrThrow(context, varEnvRec, d, name, mv);
                }
            }
        }
        /* steps 5.b-d */
        if (isEnclosedByLexicalOrHasVarForOf(evalScript)) {
            checkLexicalRedeclaration(evalScript, context, varEnv, lexEnv, varNames, mv);
        }
    }
    /* step 6 */
    ArrayDeque<HoistableDeclaration> functionsToInitialize = new ArrayDeque<>();
    /* step 7 */
    HashSet<Name> declaredFunctionNames = new HashSet<>();
    /* step 8 */
    for (StatementListItem item : reverse(varDeclarations)) {
        if (item instanceof HoistableDeclaration) {
            HoistableDeclaration d = (HoistableDeclaration) item;
            Name fn = BoundName(d);
            if (declaredFunctionNames.add(fn)) {
                canDeclareGlobalFunctionOrThrow(context, varEnvRec, d, fn, mv);
                functionsToInitialize.addFirst(d);
            }
        }
    }
    if (!functionsToInitialize.isEmpty()) {
        fo = mv.newVariable("fo", FunctionObject.class);
    }
    /* step 9 */
    LinkedHashMap<Name, VariableDeclaration> declaredVarNames = new LinkedHashMap<>();
    /* step 10 */
    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, varEnvRec, vd, vn, mv);
                        declaredVarNames.put(vn, vd);
                    }
                }
            }
        }
    }
    // ES2016: Block-scoped global function declarations
    if (hasBlockFunctions(evalScript)) {
        final boolean catchVar = codegen.isEnabled(CompatibilityOption.CatchVarStatement);
        int idCounter = 0;
        List<FunctionDeclaration> blockFunctions = evalScript.getScope().blockFunctions();
        HashSet<Name> declaredFunctionOrVarNames = new HashSet<>();
        declaredFunctionOrVarNames.addAll(declaredFunctionNames);
        declaredFunctionOrVarNames.addAll(declaredVarNames.keySet());
        for (FunctionDeclaration f : blockFunctions) {
            Name fn = f.getName();
            Jump next = new Jump();
            // Runtime check always required for global block-level function declarations.
            f.setLegacyBlockScopeId(++idCounter);
            if (isEnclosedByLexical(evalScript)) {
                canDeclareVarBinding(varEnv, lexEnv, fn, catchVar, next, mv);
            }
            // FIXME: spec issue - avoid (observable!) duplicate checks for same name?
            // FIXME: spec issue - property creation order important?
            canDeclareGlobalFunction(varEnvRec, f, fn, next, mv);
            setLegacyBlockFunction(context, f, mv);
            if (declaredFunctionOrVarNames.add(fn)) {
                createGlobalFunctionBinding(varEnvRec, f, fn, true, mv);
            }
            mv.mark(next);
        }
    }
    /* step 12 */
    List<Declaration> lexDeclarations = LexicallyScopedDeclarations(evalScript);
    /* step 13 */
    if (!lexDeclarations.isEmpty()) {
        getEnvironmentRecord(lexEnv, lexEnvRec, mv);
        createLexicalDeclarations(lexDeclarations, lexEnvRec, mv);
    }
    /* step 14 */
    for (HoistableDeclaration f : functionsToInitialize) {
        Name fn = BoundName(f);
        InstantiateFunctionObject(context, lexEnv, f, mv);
        mv.store(fo);
        createGlobalFunctionBinding(varEnvRec, f, fn, fo, true, mv);
    }
    /* step 15 */
    for (Map.Entry<Name, VariableDeclaration> e : declaredVarNames.entrySet()) {
        createGlobalVarBinding(varEnvRec, e.getValue(), e.getKey(), true, mv);
    }
    /* step 16 */
    mv._return();
}