Linter Demo

Errors: 7

Warnings: 14

File: /home/fstrocco/Dart/dart/benchmark/compiler/lib/src/js_backend/constant_handler_javascript.dart

// 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. part of js_backend; /// [ConstantCompilerTask] for compilation of constants for the JavaScript /// backend. /// /// Since this task needs to distinguish between frontend and backend constants /// the actual compilation of the constants is forwarded to a /// [DartConstantCompiler] for the frontend interpretation of the constants and /// to a [JavaScriptConstantCompiler] for the backend interpretation. class JavaScriptConstantTask extends ConstantCompilerTask { DartConstantCompiler dartConstantCompiler; JavaScriptConstantCompiler jsConstantCompiler; JavaScriptConstantTask(Compiler compiler) : this.dartConstantCompiler = new DartConstantCompiler(compiler), this.jsConstantCompiler = new JavaScriptConstantCompiler(compiler), super(compiler); String get name => 'ConstantHandler'; ConstantExpression getConstantForVariable(VariableElement element) { return dartConstantCompiler.getConstantForVariable(element); } ConstantExpression compileConstant(VariableElement element) { return measure(() { ConstantExpression result = dartConstantCompiler.compileConstant(element); jsConstantCompiler.compileConstant(element); return result; }); } void compileVariable(VariableElement element) { measure(() { jsConstantCompiler.compileVariable(element); }); } ConstantExpression compileNode(Node node, TreeElements elements) { return measure(() { ConstantExpression result = dartConstantCompiler.compileNode(node, elements); jsConstantCompiler.compileNode(node, elements); return result; }); } ConstantExpression compileMetadata(MetadataAnnotation metadata, Node node, TreeElements elements) { return measure(() { ConstantExpression constant = dartConstantCompiler.compileMetadata(metadata, node, elements); jsConstantCompiler.compileMetadata(metadata, node, elements); return constant; }); } } /** * The [JavaScriptConstantCompiler] is used to keep track of compile-time * constants, initializations of global and static fields, and default values of * optional parameters for the JavaScript interpretation of constants. */ class JavaScriptConstantCompiler extends ConstantCompilerBase implements BackendConstantEnvironment { /** Set of all registered compiled constants. */ final Set<ConstantValue> compiledConstants = new Set<ConstantValue>(); // TODO(johnniwinther): Move this to the backend constant handler. /** Caches the statics where the initial value cannot be eagerly compiled. */ final Set<VariableElement> lazyStatics = new Set<VariableElement>(); // Constants computed for constant expressions. final Map<Node, ConstantExpression> nodeConstantMap = new Map<Node, ConstantExpression>(); // Constants computed for metadata. final Map<MetadataAnnotation, ConstantExpression> metadataConstantMap = new Map<MetadataAnnotation, ConstantExpression>(); JavaScriptConstantCompiler(Compiler compiler) : super(compiler, JAVA_SCRIPT_CONSTANT_SYSTEM); ConstantExpression compileVariableWithDefinitions(VariableElement element, TreeElements definitions, {bool isConst: false}) { if (!isConst && lazyStatics.contains(element)) { return null; } ConstantExpression value = super.compileVariableWithDefinitions( element, definitions, isConst: isConst); if (!isConst && value == null) { lazyStatics.add(element); } return value; } void addCompileTimeConstantForEmission(ConstantValue constant) { compiledConstants.add(constant); } /** * Returns an [Iterable] of static non final fields that need to be * initialized. The fields list must be evaluated in order since they might * depend on each other. */ Iterable<VariableElement> getStaticNonFinalFieldsForEmission() { return initialVariableValues.keys.where((element) { return element.kind == ElementKind.FIELD && !element.isInstanceMember && !element.modifiers.isFinal && // The const fields are all either emitted elsewhere or inlined. !element.modifiers.isConst; }); } List<VariableElement> getLazilyInitializedFieldsForEmission() { return new List<VariableElement>.from(lazyStatics); } /** * Returns a list of constants topologically sorted so that dependencies * appear before the dependent constant. [preSortCompare] is a comparator * function that gives the constants a consistent order prior to the * topological sort which gives the constants an ordering that is less * sensitive to perturbations in the source code. */ List<ConstantValue> getConstantsForEmission([preSortCompare]) { // We must emit dependencies before their uses. Set<ConstantValue> seenConstants = new Set<ConstantValue>(); List<ConstantValue> result = new List<ConstantValue>(); void addConstant(ConstantValue constant) { if (!seenConstants.contains(constant)) { constant.getDependencies().forEach(addConstant); assert(!seenConstants.contains(constant)); result.add(constant); seenConstants.add(constant); } } List<ConstantValue> sorted = compiledConstants.toList(); if (preSortCompare != null) { sorted.sort(preSortCompare); } sorted.forEach(addConstant); return result; } ConstantExpression getInitialValueFor(VariableElement element) { ConstantExpression initialValue = initialVariableValues[element.declaration]; if (initialValue == null) { compiler.internalError(element, "No initial value for given element."); } return initialValue; } ConstantExpression compileNode(Node node, TreeElements elements) { return compileNodeWithDefinitions(node, elements); } ConstantExpression compileNodeWithDefinitions(Node node, TreeElements definitions, {bool isConst: true}) { ConstantExpression constant = nodeConstantMap[node]; if (constant != null) { return constant; } constant = super.compileNodeWithDefinitions(node, definitions, isConst: isConst); if (constant != null) { nodeConstantMap[node] = constant; } return constant; } ConstantExpression getConstantForNode(Node node, TreeElements definitions) { ConstantExpression constant = nodeConstantMap[node]; if (constant != null) { return constant; } return definitions.getConstant(node); } ConstantExpression getConstantForMetadata(MetadataAnnotation metadata) { return metadataConstantMap[metadata]; } ConstantExpression compileMetadata(MetadataAnnotation metadata, Node node, TreeElements elements) { ConstantExpression constant = super.compileMetadata(metadata, node, elements); metadataConstantMap[metadata] = constant; return constant; } ConstantExpression createTypeConstant(TypeDeclarationElement element) { DartType elementType = element.rawType; DartType constantType = compiler.backend.typeImplementation.computeType(compiler); return new TypeConstantExpression( new TypeConstantValue(elementType, constantType), elementType); } void forgetElement(Element element) { super.forgetElement(element); element.accept(new ForgetConstantElementVisitor(this)); if (element is AstElement && element.hasNode) { element.node.accept(new ForgetConstantNodeVisitor(this)); } } } class ForgetConstantElementVisitor extends ElementVisitor { final JavaScriptConstantCompiler constants; ForgetConstantElementVisitor(this.constants); void visitElement(Element e) { for (MetadataAnnotation data in e.metadata) { constants.metadataConstantMap.remove(data); if (data.hasNode) { data.node.accept(new ForgetConstantNodeVisitor(constants)); } } } void visitFunctionElement(FunctionElement e) { super.visitFunctionElement(e); if (e.hasFunctionSignature) { e.functionSignature.forEachParameter(this.visit); } } } class ForgetConstantNodeVisitor extends Visitor { final JavaScriptConstantCompiler constants; ForgetConstantNodeVisitor(this.constants); void visitNode(Node node) { node.visitChildren(this); constants.nodeConstantMap.remove(node); // TODO(ahe): This doesn't belong here. Rename this class and generalize. var closureClassMap = constants.compiler.closureToClassMapper.closureMappingCache .remove(node); if (closureClassMap != null) { closureClassMap.removeMyselfFrom( constants.compiler.enqueuer.codegen.universe); } } }