Move dart2js from sdk/lib/_internal/compiler to pkg/compiler

sdk/lib/_internal/compiler/implementation/mirror_renamer/renamer.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 mirror_renamer;
-
-class MirrorRenamerImpl implements MirrorRenamer {
-  static const String MIRROR_HELPER_GET_NAME_FUNCTION = 'helperGetName';
-  static final Uri DART_MIRROR_HELPER =
-      new Uri(scheme: 'dart', path: '_mirror_helper');
-  static const String MIRROR_HELPER_SYMBOLS_MAP_NAME = '_SYMBOLS';
-
-  /// Initialized when dart:mirrors is loaded if the useMirrorHelperLibrary
-  /// field is set.
-  final LibraryElement helperLibrary;
-
-  /// Initialized when dart:mirrors is loaded if the useMirrorHelperLibrary
-  /// field is set.
-  final FunctionElement getNameFunction;
-
-  /// Initialized when dart:mirrors is loaded if the useMirrorHelperLibrary
-  /// field is set.
-  final FieldElement symbolsMapVariable;
-
-  /// Maps mangled name to original name.
-  Map<String, String> symbols = new Map<String, String>();
-
-  /// Contains all occurrencs of MirrorSystem.getName() calls in the user code.
-  List<Node> mirrorSystemGetNameNodes = <Node>[];
-
-  /**
-   *  Initialized when the placeholderCollector collects the FunctionElement
-   *  backend.mirrorHelperGetNameFunction which represents the helperGetName
-   *  function in _mirror_helper.
-   */
-  FunctionExpression get getNameFunctionNode => getNameFunction.node;
-  VariableDefinitions get symbolsMapNode => symbolsMapVariable.node;
-  Compiler compiler;
-  DartBackend backend;
-
-  MirrorRenamerImpl(this.compiler, this.backend, LibraryElement library)
-      : this.helperLibrary = library,
-        getNameFunction = library.find(
-            MirrorRenamerImpl.MIRROR_HELPER_GET_NAME_FUNCTION),
-        symbolsMapVariable = library.find(
-            MirrorRenamerImpl.MIRROR_HELPER_SYMBOLS_MAP_NAME);
-
-  bool isMirrorHelperLibrary(LibraryElement element) {
-    return element == helperLibrary;
-  }
-
-  void registerStaticSend(Element currentElement, Element target, Send node) {
-    if (target == compiler.mirrorSystemGetNameFunction &&
-        currentElement.library != helperLibrary) {
-      // Access to `MirrorSystem.getName` that needs to be redirected to the
-      // [getNameFunction].
-      mirrorSystemGetNameNodes.add(node);
-    }
-  }
-
-  /**
-   * Adds a toplevel node to the output containing a map from the mangled
-   * to the unmangled names and replaces calls to MirrorSystem.getName()
-   * with calls to the corresponding wrapper from _mirror_helper which has
-   * been added during resolution. [renames] is assumed to map nodes in user
-   * code to mangled names appearing in output code, and [topLevelNodes] should
-   * contain all the toplevel ast nodes that will be emitted in the output.
-   */
-  void addRenames(Map<Node, String> renames, List<Node> topLevelNodes,
-                  PlaceholderCollector placeholderCollector) {
-    // Right now we only support instances of MirrorSystem.getName,
-    // hence if there are no occurence of these we don't do anything.
-    if (mirrorSystemGetNameNodes.isEmpty) {
-      return;
-    }
-
-    Node parse(String text) {
-      Token tokens = compiler.scanner.tokenize(text);
-      return compiler.parser.parseCompilationUnit(tokens);
-    }
-
-    // Add toplevel map containing all renames of members.
-    symbols = new Map<String, String>();
-    for (Set<Identifier> s in placeholderCollector.memberPlaceholders.values) {
-      // All members in a set have the same name so we only need to look at one.
-      Identifier sampleNode = s.first;
-      symbols.putIfAbsent(renames[sampleNode], () => sampleNode.source);
-    }
-
-    Identifier symbolsMapIdentifier =
-        symbolsMapNode.definitions.nodes.head.asSend().selector;
-    assert(symbolsMapIdentifier != null);
-    topLevelNodes.remove(symbolsMapNode);
-
-    StringBuffer sb = new StringBuffer(
-        'const ${renames[symbolsMapIdentifier]} = const<String,String>{');
-    bool first = true;
-    for (String mangledName in symbols.keys) {
-      if (!first) {
-        sb.write(',');
-      } else {
-        first = false;
-      }
-      sb.write("'$mangledName' : '");
-      sb.write(symbols[mangledName]);
-      sb.write("'");
-    }
-    sb.write('};');
-    sb.writeCharCode(0); // Terminate the string with '0', see [StringScanner].
-    topLevelNodes.add(parse(sb.toString()));
-
-    // Replace calls to Mirrorsystem.getName with calls to helper function.
-    mirrorSystemGetNameNodes.forEach((node) {
-      renames[node.selector] = renames[getNameFunctionNode.name];
-      renames[node.receiver] = '';
-    });
-  }
-}