| // Copyright (c) 2014, the Dart project authors. Please see the AUTHORS file |
| // for details. All rights reserved. Use of this source code is governed by a |
| // BSD-style license that can be found in the LICENSE file. |
| |
| library types.constants; |
| |
| import '../common.dart'; |
| import '../compiler.dart' show |
| Compiler; |
| import '../constants/values.dart'; |
| import '../js_backend/js_backend.dart' show |
| SyntheticConstantKind; |
| import 'types.dart'; |
| |
| /// Computes the [TypeMask] for the constant [value]. |
| TypeMask computeTypeMask(Compiler compiler, ConstantValue value) { |
| return value.accept(const ConstantValueTypeMasks(), compiler); |
| } |
| |
| class ConstantValueTypeMasks extends ConstantValueVisitor<TypeMask, Compiler> { |
| const ConstantValueTypeMasks(); |
| |
| @override |
| TypeMask visitConstructed(ConstructedConstantValue constant, |
| Compiler compiler) { |
| if (compiler.backend.isInterceptorClass(constant.type.element)) { |
| return compiler.typesTask.nonNullType; |
| } |
| return new TypeMask.nonNullExact(constant.type.element, compiler.world); |
| } |
| |
| @override |
| TypeMask visitDeferred(DeferredConstantValue constant, Compiler compiler) { |
| return constant.referenced.accept(this, compiler); |
| } |
| |
| @override |
| TypeMask visitDouble(DoubleConstantValue constant, Compiler compiler) { |
| // We have to recognize double constants that are 'is int'. |
| if (compiler.backend.constantSystem.isInt(constant)) { |
| if (constant.isMinusZero) { |
| return compiler.typesTask.uint31Type; |
| } else { |
| assert(constant.isPositiveInfinity || constant.isNegativeInfinity); |
| return compiler.typesTask.intType; |
| } |
| } |
| return compiler.typesTask.doubleType; |
| } |
| |
| @override |
| TypeMask visitSynthetic(SyntheticConstantValue constant, Compiler compiler) { |
| switch (constant.kind) { |
| case SyntheticConstantKind.DUMMY_INTERCEPTOR: |
| return constant.payload; |
| case SyntheticConstantKind.EMPTY_VALUE: |
| return constant.payload; |
| case SyntheticConstantKind.TYPEVARIABLE_REFERENCE: |
| return compiler.typesTask.intType; |
| case SyntheticConstantKind.NAME: |
| return compiler.typesTask.stringType; |
| default: |
| DiagnosticReporter reporter = compiler.reporter; |
| reporter.internalError(CURRENT_ELEMENT_SPANNABLE, |
| "Unexpected DummyConstantKind."); |
| return null; |
| } |
| } |
| |
| @override |
| TypeMask visitBool(BoolConstantValue constant, Compiler compiler) { |
| return compiler.typesTask.boolType; |
| } |
| |
| @override |
| TypeMask visitFunction(FunctionConstantValue constant, Compiler compiler) { |
| return compiler.typesTask.functionType; |
| } |
| |
| @override |
| TypeMask visitInt(IntConstantValue constant, Compiler compiler) { |
| if (constant.isUInt31()) return compiler.typesTask.uint31Type; |
| if (constant.isUInt32()) return compiler.typesTask.uint32Type; |
| if (constant.isPositive()) return compiler.typesTask.positiveIntType; |
| return compiler.typesTask.intType; |
| } |
| |
| @override |
| TypeMask visitInterceptor(InterceptorConstantValue constant, |
| Compiler compiler) { |
| return compiler.typesTask.nonNullType; |
| } |
| |
| @override |
| TypeMask visitList(ListConstantValue constant, Compiler compiler) { |
| return compiler.typesTask.constListType; |
| } |
| |
| @override |
| TypeMask visitMap(MapConstantValue constant, Compiler compiler) { |
| return compiler.typesTask.constMapType; |
| } |
| |
| @override |
| TypeMask visitNull(NullConstantValue constant, Compiler compiler) { |
| return compiler.typesTask.nullType; |
| } |
| |
| @override |
| TypeMask visitString(StringConstantValue constant, Compiler compiler) { |
| return compiler.typesTask.stringType; |
| } |
| |
| @override |
| TypeMask visitType(TypeConstantValue constant, Compiler compiler) { |
| return compiler.typesTask.typeType; |
| } |
| } |