Linter Demo

Errors: 0

Warnings: 6

File: /home/fstrocco/Dart/dart/benchmark/compiler/lib/src/js_emitter/metadata_collector.dart

// Copyright (c) 2013, 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. part of dart2js.js_emitter; class MetadataCollector { final Compiler _compiler; final Emitter _emitter; /// A list of JS expressions that represent metadata, parameter names and /// type variable types. final List<String> globalMetadata = <String>[]; /// A map used to canonicalize the entries of globalMetadata. final Map<String, int> _globalMetadataMap = <String, int>{}; /// A list of JS expression representing types including function types and /// typedefs. final List<String> types = <String>[]; /// A map used to canonicalize the entries of types. final Map<String, int> _typesMap = <String, int>{}; MetadataCollector(this._compiler, this._emitter); JavaScriptBackend get _backend => _compiler.backend; TypeVariableHandler get _typeVariableHandler => _backend.typeVariableHandler; bool _mustEmitMetadataFor(Element element) { return _backend.mustRetainMetadata && _backend.referencedFromMirrorSystem(element); } /// The metadata function returns the metadata associated with /// [element] in generated code. The metadata needs to be wrapped /// in a function as it refers to constants that may not have been /// constructed yet. For example, a class is allowed to be /// annotated with itself. The metadata function is used by /// mirrors_patch to implement DeclarationMirror.metadata. jsAst.Fun buildMetadataFunction(Element element) { if (!_mustEmitMetadataFor(element)) return null; return _compiler.withCurrentElement(element, () { List<jsAst.Expression> metadata = <jsAst.Expression>[]; Link link = element.metadata; // TODO(ahe): Why is metadata sometimes null? if (link != null) { for (; !link.isEmpty; link = link.tail) { MetadataAnnotation annotation = link.head; ConstantExpression constant = _backend.constants.getConstantForMetadata(annotation); if (constant == null) { _compiler.internalError(annotation, 'Annotation value is null.'); } else { metadata.add(_emitter.constantReference(constant.value)); } } } if (metadata.isEmpty) return null; return js('function() { return # }', new jsAst.ArrayInitializer(metadata)); }); } List<int> reifyDefaultArguments(FunctionElement function) { FunctionSignature signature = function.functionSignature; if (signature.optionalParameterCount == 0) return const []; List<int> defaultValues = <int>[]; for (ParameterElement element in signature.optionalParameters) { ConstantExpression constant = _backend.constants.getConstantForVariable(element); String stringRepresentation = (constant == null) ? "null" : jsAst.prettyPrint( _emitter.constantReference(constant.value), _compiler).getText(); defaultValues.add(addGlobalMetadata(stringRepresentation)); } return defaultValues; } int reifyMetadata(MetadataAnnotation annotation) { ConstantExpression constant = _backend.constants.getConstantForMetadata(annotation); if (constant == null) { _compiler.internalError(annotation, 'Annotation value is null.'); return -1; } return addGlobalMetadata( jsAst.prettyPrint( _emitter.constantReference(constant.value), _compiler).getText()); } int reifyType(DartType type) { jsAst.Expression representation = _backend.rti.getTypeRepresentation( type, (variable) { return js.number( _typeVariableHandler.reifyTypeVariable( variable.element)); }, (TypedefType typedef) { return _backend.isAccessibleByReflection(typedef.element); }); return addType( jsAst.prettyPrint(representation, _compiler).getText()); } int reifyName(String name) { return addGlobalMetadata('"$name"'); } int addGlobalMetadata(String string) { return _globalMetadataMap.putIfAbsent(string, () { globalMetadata.add(string); return globalMetadata.length - 1; }); } int addType(String compiledType) { return _typesMap.putIfAbsent(compiledType, () { types.add(compiledType); return types.length - 1; }); } List<int> computeMetadata(FunctionElement element) { return _compiler.withCurrentElement(element, () { if (!_mustEmitMetadataFor(element)) return const <int>[]; List<int> metadata = <int>[]; Link link = element.metadata; // TODO(ahe): Why is metadata sometimes null? if (link != null) { for (; !link.isEmpty; link = link.tail) { metadata.add(reifyMetadata(link.head)); } } return metadata; }); } }