Remove dead code related to the diagnostics server.

pkg/analysis_server/lib/src/status/memory_use.dart

-// Copyright (c) 2016, 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.
-
-import 'dart:collection';
-
-import 'package:analysis_server/src/analysis_server.dart';
-import 'package:analyzer/dart/ast/ast.dart';
-import 'package:analyzer/dart/ast/visitor.dart';
-import 'package:analyzer/dart/element/element.dart';
-import 'package:analyzer/dart/element/visitor.dart';
-import 'package:analyzer/src/context/cache.dart';
-import 'package:analyzer/src/context/context.dart' show AnalysisContextImpl;
-import 'package:analyzer/src/dart/element/element.dart';
-import 'package:analyzer/src/generated/engine.dart';
-import 'package:analyzer/src/generated/sdk.dart';
-import 'package:analyzer/task/dart.dart';
-import 'package:analyzer/task/model.dart';
-
-/**
- * A visitor that will count the number of instances of each type of AST node.
- */
-class AstNodeCounter extends UnifyingAstVisitor<Null> {
-  /**
-   * A table mapping the types of the AST nodes to the number of instances
-   * visited.
-   */
-  final Map<Type, int> nodeCounts;
-
-  /**
-   * Initialize a newly created counter to increment the counts in the given map
-   * of [nodeCounts].
-   */
-  AstNodeCounter(this.nodeCounts);
-
-  @override
-  visitNode(AstNode node) {
-    Type type = node.runtimeType;
-    int count = nodeCounts[type] ?? 0;
-    nodeCounts[type] = count + 1;
-    super.visitNode(node);
-  }
-}
-
-/**
- * A visitor that will count the number of instances of each type of element.
- */
-class ElementCounter extends GeneralizingElementVisitor<Null> {
-  /**
-   * A table mapping the types of the elements to the number of instances
-   * visited.
-   */
-  final Map<Type, int> elementCounts;
-
-  /**
-   * A table mapping the types of the AST nodes to the number of instances
-   * visited.
-   */
-  final Map<Type, int> nodeCounts;
-
-  /**
-   * Initialize a newly created counter to increment the counts in the given map
-   * of [elementCounts].
-   */
-  ElementCounter(this.elementCounts, this.nodeCounts);
-
-  @override
-  visitConstructorElement(ConstructorElement element) {
-    if (element is ConstructorElementImpl) {
-      List<ConstructorInitializer> initializers = element.constantInitializers;
-      if (initializers != null) {
-        initializers.forEach((ConstructorInitializer initializer) {
-          _countNodes(initializer);
-        });
-      }
-    }
-    visitElement(element);
-  }
-
-  @override
-  visitElement(Element element) {
-    Type type = element.runtimeType;
-    int count = elementCounts[type] ?? 0;
-    elementCounts[type] = count + 1;
-    element.metadata.forEach((ElementAnnotation annotation) {
-      if (annotation is ElementAnnotationImpl) {
-        _countNodes(annotation.annotationAst);
-      }
-    });
-    super.visitElement(element);
-  }
-
-  visitFieldElement(FieldElement element) {
-    if (element is ConstVariableElement) {
-      _countInitializer(element as ConstVariableElement);
-    }
-    visitElement(element);
-  }
-
-  visitLocalVariableElement(LocalVariableElement element) {
-    if (element is ConstVariableElement) {
-      _countInitializer(element as ConstVariableElement);
-    }
-    visitElement(element);
-  }
-
-  visitParameterElement(ParameterElement element) {
-    if (element is ConstVariableElement) {
-      _countInitializer(element as ConstVariableElement);
-    }
-    visitElement(element);
-  }
-
-  visitTopLevelVariableElement(TopLevelVariableElement element) {
-    if (element is ConstVariableElement) {
-      _countInitializer(element as ConstVariableElement);
-    }
-    visitElement(element);
-  }
-
-  void _countInitializer(ConstVariableElement element) {
-    _countNodes(element.constantInitializer);
-  }
-
-  void _countNodes(AstNode node) {
-    if (node != null) {
-      node.accept(new AstNodeCounter(nodeCounts));
-    }
-  }
-}
-
-/**
- * A set used when the number of instances of some type is too large to be kept.
- */
-class InfiniteSet implements Set {
-  /**
-   * The unique instance of this class.
-   */
-  static final InfiniteSet instance = new InfiniteSet();
-
-  @override
-  int get length => -1;
-
-  @override
-  dynamic noSuchMethod(Invocation invocation) {
-    throw new UnsupportedError('Do not use instances of InfiniteSet');
-  }
-}
-
-/**
- * Computes memory usage data by traversing the data structures reachable from
- * an analysis server.
- */
-class MemoryUseData {
-  /**
-   * The maximum size of an instance set.
-   */
-  static const int maxInstanceSetSize = 1000000;
-
-  /**
-   * A table mapping classes to instances of the class.
-   */
-  Map<Type, Set> instances = new HashMap<Type, Set>();
-
-  /**
-   * A table mapping classes to the classes of objects from which they were
-   * reached.
-   */
-  Map<Type, Set<Type>> ownerMap = new HashMap<Type, Set<Type>>();
-
-  /**
-   * A set of all the library specific units, using equality rather than
-   * identity in order to determine whether re-using equal instances would save
-   * significant space.
-   */
-  Set<LibrarySpecificUnit> uniqueLSUs = new HashSet<LibrarySpecificUnit>();
-
-  /**
-   * A set of all the targeted results, using equality rather than identity in
-   * order to determine whether re-using equal instances would save significant
-   * space.
-   */
-  Set<TargetedResult> uniqueTargetedResults = new HashSet<TargetedResult>();
-
-  /**
-   * A set containing all of the analysis targets for which the key in the
-   * cache partition is not the same instance as the target stored in the entry.
-   */
-  Set<AnalysisTarget> mismatchedTargets = new HashSet<AnalysisTarget>();
-
-  /**
-   * A table mapping the types of AST nodes to the number of instances being
-   * held directly (as values in the cache).
-   */
-  Map<Type, int> directNodeCounts = new HashMap<Type, int>();
-
-  /**
-   * A table mapping the types of AST nodes to the number of instances being
-   * held indirectly (such as nodes reachable from element models).
-   */
-  Map<Type, int> indirectNodeCounts = new HashMap<Type, int>();
-
-  /**
-   * A table mapping the types of the elements to the number of instances being
-   * held directly (as values in the cache).
-   */
-  final Map<Type, int> elementCounts = new HashMap<Type, int>();
-
-  /**
-   * Initialize a newly created instance.
-   */
-  MemoryUseData();
-
-  /**
-   * Traverse an analysis [server] to compute memory usage data.
-   */
-  void processAnalysisServer(AnalysisServer server) {
-    _recordInstance(server, null);
-    Iterable<AnalysisContext> contexts = server.analysisContexts;
-    for (AnalysisContextImpl context in contexts) {
-      _processAnalysisContext(context, server);
-    }
-    DartSdkManager manager = server.sdkManager;
-    List<SdkDescription> descriptors = manager.sdkDescriptors;
-    for (SdkDescription descriptor in descriptors) {
-      DartSdk sdk = manager.getSdk(descriptor, () => null);
-      if (sdk != null) {
-        _processAnalysisContext(sdk.context, manager);
-      }
-    }
-  }
-
-  void _processAnalysisContext(AnalysisContextImpl context, Object owner) {
-    _recordInstance(context, owner);
-    _recordInstance(context.analysisCache, context);
-    CachePartition partition = context.privateAnalysisCachePartition;
-    Map<AnalysisTarget, CacheEntry> map = partition.entryMap;
-    map.forEach((AnalysisTarget target, CacheEntry entry) {
-      _processAnalysisTarget(target, partition);
-      _processCacheEntry(entry, partition);
-      if (!identical(entry.target, target)) {
-        mismatchedTargets.add(target);
-      }
-    });
-  }
-
-  void _processAnalysisTarget(AnalysisTarget target, Object owner) {
-    _recordInstance(target, owner);
-  }
-
-  void _processCacheEntry(CacheEntry entry, Object owner) {
-    _recordInstance(entry, owner);
-    List<ResultDescriptor> descriptors = entry.nonInvalidResults;
-    for (ResultDescriptor descriptor in descriptors) {
-      _recordInstance(descriptor, entry);
-      _processResultData(entry.getResultDataOrNull(descriptor), entry);
-    }
-  }
-
-  void _processResultData(ResultData resultData, Object owner) {
-    _recordInstance(resultData, owner);
-    if (resultData != null) {
-      _recordInstance(resultData.state, resultData);
-      _recordInstance(resultData.value, resultData,
-          onFirstOccurrence: (Object object) {
-        if (object is AstNode) {
-          object.accept(new AstNodeCounter(directNodeCounts));
-        } else if (object is Element) {
-          object.accept(new ElementCounter(elementCounts, indirectNodeCounts));
-        }
-      });
-      resultData.dependedOnResults.forEach((TargetedResult result) =>
-          _processTargetedResult(result, resultData));
-      resultData.dependentResults.forEach((TargetedResult result) =>
-          _processTargetedResult(result, resultData));
-    }
-  }
-
-  void _processTargetedResult(TargetedResult result, Object owner) {
-    _recordInstance(result, owner);
-    uniqueTargetedResults.add(result);
-    _recordInstance(result.target, result);
-    _recordInstance(result.result, result);
-  }
-
-  /**
-   * Record the given [instance] that was found. If this is the first time that
-   * the instance has been found, execute the [onFirstOccurrence] function.
-   *
-   * Note that instances will not be recorded if there are more than
-   * [maxInstanceSetSize] instances of the same type, and that the
-   * [onFirstOccurrence] function will not be executed if the instance is not
-   * recorded.
-   */
-  void _recordInstance(Object instance, Object owner,
-      {void onFirstOccurrence(Object object)}) {
-    Type type = instance.runtimeType;
-    Set instanceSet = instances.putIfAbsent(type, () => new HashSet.identity());
-    if (instanceSet != InfiniteSet.instance) {
-      if (instanceSet.add(instance) && onFirstOccurrence != null) {
-        onFirstOccurrence(instance);
-      }
-      if (instanceSet.length >= maxInstanceSetSize) {
-        instances[type] = InfiniteSet.instance;
-      }
-    }
-    ownerMap
-        .putIfAbsent(instance.runtimeType, () => new HashSet<Type>())
-        .add(owner.runtimeType);
-    if (instance is LibrarySpecificUnit) {
-      uniqueLSUs.add(instance);
-    }
-  }
-}