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

pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart

Index: pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart
diff --git a/pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart b/pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart
deleted file mode 100644
index 13e2df190681008572bc6c6b58a45d41942953b3..0000000000000000000000000000000000000000
--- a/pkg/compiler/lib/src/js_emitter/old_emitter/class_emitter.dart
+++ /dev/null
@@ -1,609 +0,0 @@
-// 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 ClassEmitter extends CodeEmitterHelper {
-
-  ClassStubGenerator get _stubGenerator =>
-      new ClassStubGenerator(compiler, namer, backend);
-
-  /**
-   * Documentation wanted -- johnniwinther
-   *
-   * Invariant: [classElement] must be a declaration element.
-   */
-  void generateClass(ClassElement classElement,
-                     ClassBuilder properties,
-                     Map<String, jsAst.Expression> additionalProperties) {
-    final onlyForRti =
-        emitter.typeTestEmitter.rtiNeededClasses.contains(classElement);
-
-    assert(invariant(classElement, classElement.isDeclaration));
-    assert(invariant(classElement, !classElement.isNative || onlyForRti));
-
-    emitter.needsDefineClass = true;
-    String className = namer.getNameOfClass(classElement);
-
-    ClassElement superclass = classElement.superclass;
-    String superName = "";
-    if (superclass != null) {
-      superName = namer.getNameOfClass(superclass);
-    }
-
-    if (classElement.isMixinApplication) {
-      String mixinName = namer.getNameOfClass(computeMixinClass(classElement));
-      superName = '$superName+$mixinName';
-      emitter.needsMixinSupport = true;
-    }
-
-    ClassBuilder builder = new ClassBuilder(classElement, namer);
-    emitClassConstructor(classElement, builder, onlyForRti: onlyForRti);
-    emitFields(classElement, builder, superName, onlyForRti: onlyForRti);
-    emitClassGettersSetters(classElement, builder, onlyForRti: onlyForRti);
-    emitInstanceMembers(classElement, builder, onlyForRti: onlyForRti);
-    emitter.typeTestEmitter.emitIsTests(classElement, builder);
-    if (additionalProperties != null) {
-      additionalProperties.forEach(builder.addProperty);
-    }
-
-    if (classElement == backend.closureClass) {
-      // We add a special getter here to allow for tearing off a closure from
-      // itself.
-      String name = namer.getMappedInstanceName(Compiler.CALL_OPERATOR_NAME);
-      jsAst.Fun function = js('function() { return this; }');
-      builder.addProperty(namer.getterNameFromAccessorName(name), function);
-    }
-
-    emitTypeVariableReaders(classElement, builder);
-
-    emitClassBuilderWithReflectionData(
-        className, classElement, builder, properties);
-  }
-
-  void emitClassConstructor(ClassElement classElement,
-                            ClassBuilder builder,
-                            {bool onlyForRti: false}) {
-    List<String> fields = <String>[];
-    if (!onlyForRti && !classElement.isNative) {
-      visitFields(classElement, false,
-                  (Element member,
-                   String name,
-                   String accessorName,
-                   bool needsGetter,
-                   bool needsSetter,
-                   bool needsCheckedSetter) {
-        fields.add(name);
-      });
-    }
-
-    jsAst.Expression constructorAst =
-        _stubGenerator.generateClassConstructor(classElement, fields);
-
-    String constructorName = namer.getNameOfClass(classElement);
-    OutputUnit outputUnit =
-        compiler.deferredLoadTask.outputUnitForElement(classElement);
-    emitter.emitPrecompiledConstructor(
-        outputUnit, constructorName, constructorAst);
-  }
-
-  /// Returns `true` if fields added.
-  bool emitFields(Element element,
-                  ClassBuilder builder,
-                  String superName,
-                  { bool classIsNative: false,
-                    bool emitStatics: false,
-                    bool onlyForRti: false }) {
-    assert(!emitStatics || !onlyForRti);
-    if (element.isLibrary) {
-      assert(invariant(element, emitStatics));
-    } else if (!element.isClass) {
-      throw new SpannableAssertionFailure(
-          element, 'Must be a ClassElement or a LibraryElement');
-    }
-    if (emitStatics) {
-      assert(invariant(element, superName == null, message: superName));
-    } else {
-      assert(invariant(element, superName != null));
-      builder.superName = superName;
-    }
-    var fieldMetadata = [];
-    bool hasMetadata = false;
-    bool fieldsAdded = false;
-
-    if (!onlyForRti) {
-      visitFields(element, emitStatics,
-                  (VariableElement field,
-                   String name,
-                   String accessorName,
-                   bool needsGetter,
-                   bool needsSetter,
-                   bool needsCheckedSetter) {
-        // Ignore needsCheckedSetter - that is handled below.
-        bool needsAccessor = (needsGetter || needsSetter);
-        // We need to output the fields for non-native classes so we can auto-
-        // generate the constructor.  For native classes there are no
-        // constructors, so we don't need the fields unless we are generating
-        // accessors at runtime.
-        if (!classIsNative || needsAccessor) {
-          var metadata = emitter.metadataEmitter.buildMetadataFunction(field);
-          if (metadata != null) {
-            hasMetadata = true;
-          } else {
-            metadata = new jsAst.LiteralNull();
-          }
-          fieldMetadata.add(metadata);
-          recordMangledField(field, accessorName,
-              namer.privateName(field.library, field.name));
-          String fieldName = name;
-          String fieldCode = '';
-          String reflectionMarker = '';
-          if (!needsAccessor) {
-            // Emit field for constructor generation.
-            assert(!classIsNative);
-          } else {
-            // Emit (possibly renaming) field name so we can add accessors at
-            // runtime.
-            if (name != accessorName) {
-              fieldName = '$accessorName:$name';
-            }
-
-            int getterCode = 0;
-            if (needsAccessor && backend.fieldHasInterceptedGetter(field)) {
-              emitter.interceptorEmitter.interceptorInvocationNames.add(
-                  namer.getterName(field));
-            }
-            if (needsAccessor && backend.fieldHasInterceptedGetter(field)) {
-              emitter.interceptorEmitter.interceptorInvocationNames.add(
-                  namer.setterName(field));
-            }
-            if (needsGetter) {
-              if (field.isInstanceMember) {
-                // 01:  function() { return this.field; }
-                // 10:  function(receiver) { return receiver.field; }
-                // 11:  function(receiver) { return this.field; }
-                bool isIntercepted = backend.fieldHasInterceptedGetter(field);
-                getterCode += isIntercepted ? 2 : 0;
-                getterCode += backend.isInterceptorClass(element) ? 0 : 1;
-                // TODO(sra): 'isInterceptorClass' might not be the correct test
-                // for methods forced to use the interceptor convention because
-                // the method's class was elsewhere mixed-in to an interceptor.
-                assert(!field.isInstanceMember || getterCode != 0);
-                if (isIntercepted) {
-                  emitter.interceptorEmitter.interceptorInvocationNames.add(
-                      namer.getterName(field));
-                }
-              } else {
-                getterCode = 1;
-              }
-            }
-            int setterCode = 0;
-            if (needsSetter) {
-              if (field.isInstanceMember) {
-                // 01:  function(value) { this.field = value; }
-                // 10:  function(receiver, value) { receiver.field = value; }
-                // 11:  function(receiver, value) { this.field = value; }
-                bool isIntercepted = backend.fieldHasInterceptedSetter(field);
-                setterCode += isIntercepted ? 2 : 0;
-                setterCode += backend.isInterceptorClass(element) ? 0 : 1;
-                assert(!field.isInstanceMember || setterCode != 0);
-                if (isIntercepted) {
-                  emitter.interceptorEmitter.interceptorInvocationNames.add(
-                      namer.setterName(field));
-                }
-              } else {
-                setterCode = 1;
-              }
-            }
-            int code = getterCode + (setterCode << 2);
-            if (code == 0) {
-              compiler.internalError(field,
-                  'Field code is 0 ($element/$field).');
-            } else {
-              fieldCode = FIELD_CODE_CHARACTERS[code - FIRST_FIELD_CODE];
-            }
-          }
-          if (backend.isAccessibleByReflection(field)) {
-            DartType type = field.type;
-            reflectionMarker = '-${emitter.metadataEmitter.reifyType(type)}';
-          }
-          String builtFieldname = '$fieldName$fieldCode$reflectionMarker';
-          builder.addField(builtFieldname);
-          // Add 1 because adding a field to the class also requires a comma
-          compiler.dumpInfoTask.recordFieldNameSize(field,
-              builtFieldname.length + 1);
-          fieldsAdded = true;
-        }
-      });
-    }
-
-    if (hasMetadata) {
-      builder.fieldMetadata = fieldMetadata;
-    }
-    return fieldsAdded;
-  }
-
-  void emitClassGettersSetters(ClassElement classElement,
-                               ClassBuilder builder,
-                               {bool onlyForRti: false}) {
-    if (onlyForRti) return;
-
-    visitFields(classElement, false,
-                (VariableElement member,
-                 String name,
-                 String accessorName,
-                 bool needsGetter,
-                 bool needsSetter,
-                 bool needsCheckedSetter) {
-      compiler.withCurrentElement(member, () {
-        if (needsCheckedSetter) {
-          assert(!needsSetter);
-          generateCheckedSetter(member, name, accessorName, builder);
-        }
-        if (needsGetter) {
-          generateGetter(member, name, accessorName, builder);
-        }
-        if (needsSetter) {
-          generateSetter(member, name, accessorName, builder);
-        }
-      });
-    });
-  }
-
-  /**
-   * Documentation wanted -- johnniwinther
-   *
-   * Invariant: [classElement] must be a declaration element.
-   */
-  void emitInstanceMembers(ClassElement classElement,
-                           ClassBuilder builder,
-                           {bool onlyForRti: false}) {
-    assert(invariant(classElement, classElement.isDeclaration));
-
-    if (onlyForRti || classElement.isMixinApplication) return;
-
-    void visitMember(ClassElement enclosing, Element member) {
-      assert(invariant(classElement, member.isDeclaration));
-      if (member.isInstanceMember) {
-        emitter.containerBuilder.addMember(member, builder);
-      }
-    }
-
-    classElement.implementation.forEachMember(
-        visitMember,
-        includeBackendMembers: true);
-
-    if (identical(classElement, compiler.objectClass)
-        && compiler.enabledNoSuchMethod) {
-      // Emit the noSuchMethod handlers on the Object prototype now,
-      // so that the code in the dynamicFunction helper can find
-      // them. Note that this helper is invoked before analyzing the
-      // full JS script.
-      if (!emitter.nativeEmitter.handleNoSuchMethod) {
-        emitter.nsmEmitter.emitNoSuchMethodHandlers(builder.addProperty);
-      }
-    }
-  }
-
-  void emitClassBuilderWithReflectionData(String className,
-                                          ClassElement classElement,
-                                          ClassBuilder classBuilder,
-                                          ClassBuilder enclosingBuilder) {
-    var metadata = emitter.metadataEmitter.buildMetadataFunction(classElement);
-    if (metadata != null) {
-      classBuilder.addProperty("@", metadata);
-    }
-
-    if (backend.isAccessibleByReflection(classElement)) {
-      List<DartType> typeVars = classElement.typeVariables;
-      Iterable typeVariableProperties = emitter.typeVariableHandler
-          .typeVariablesOf(classElement).map(js.number);
-
-      ClassElement superclass = classElement.superclass;
-      bool hasSuper = superclass != null;
-      if ((!typeVariableProperties.isEmpty && !hasSuper) ||
-          (hasSuper && !equalElements(superclass.typeVariables, typeVars))) {
-        classBuilder.addProperty('<>',
-            new jsAst.ArrayInitializer.from(typeVariableProperties));
-      }
-    }
-
-    List<jsAst.Property> statics = new List<jsAst.Property>();
-    ClassBuilder staticsBuilder = new ClassBuilder(classElement, namer);
-    if (emitFields(classElement, staticsBuilder, null, emitStatics: true)) {
-      jsAst.ObjectInitializer initializer =
-        staticsBuilder.toObjectInitializer();
-      compiler.dumpInfoTask.registerElementAst(classElement,
-        initializer);
-      jsAst.Node property = initializer.properties.single;
-      compiler.dumpInfoTask.registerElementAst(classElement, property);
-      statics.add(property);
-    }
-
-    ClassBuilder classProperties =
-        emitter.elementDescriptors.remove(classElement);
-    if (classProperties != null) {
-      statics.addAll(classProperties.properties);
-    }
-
-    if (!statics.isEmpty) {
-      classBuilder.addProperty('static', new jsAst.ObjectInitializer(statics));
-    }
-
-    // TODO(ahe): This method (generateClass) should return a jsAst.Expression.
-    jsAst.ObjectInitializer propertyValue = classBuilder.toObjectInitializer();
-    compiler.dumpInfoTask.registerElementAst(classBuilder.element, propertyValue);
-    enclosingBuilder.addProperty(className, propertyValue);
-
-    String reflectionName = emitter.getReflectionName(classElement, className);
-    if (reflectionName != null) {
-      if (!backend.isAccessibleByReflection(classElement)) {
-        enclosingBuilder.addProperty("+$reflectionName", js.number(0));
-      } else {
-        List<int> types = <int>[];
-        if (classElement.supertype != null) {
-          types.add(emitter.metadataEmitter.reifyType(classElement.supertype));
-        }
-        for (DartType interface in classElement.interfaces) {
-          types.add(emitter.metadataEmitter.reifyType(interface));
-        }
-        enclosingBuilder.addProperty("+$reflectionName",
-            new jsAst.ArrayInitializer.from(types.map(js.number)));
-      }
-    }
-  }
-
-  /**
-   * Invokes [f] for each of the fields of [element].
-   *
-   * [element] must be a [ClassElement] or a [LibraryElement].
-   *
-   * If [element] is a [ClassElement], the static fields of the class are
-   * visited if [visitStatics] is true and the instance fields are visited if
-   * [visitStatics] is false.
-   *
-   * If [element] is a [LibraryElement], [visitStatics] must be true.
-   *
-   * When visiting the instance fields of a class, the fields of its superclass
-   * are also visited if the class is instantiated.
-   *
-   * Invariant: [element] must be a declaration element.
-   */
-  void visitFields(Element element, bool visitStatics, AcceptField f) {
-    assert(invariant(element, element.isDeclaration));
-
-    bool isClass = false;
-    bool isLibrary = false;
-    if (element.isClass) {
-      isClass = true;
-    } else if (element.isLibrary) {
-      isLibrary = true;
-      assert(invariant(element, visitStatics));
-    } else {
-      throw new SpannableAssertionFailure(
-          element, 'Expected a ClassElement or a LibraryElement.');
-    }
-
-    // If the class is never instantiated we still need to set it up for
-    // inheritance purposes, but we can simplify its JavaScript constructor.
-    bool isInstantiated =
-        compiler.codegenWorld.directlyInstantiatedClasses.contains(element);
-
-    void visitField(Element holder, VariableElement field) {
-      assert(invariant(element, field.isDeclaration));
-      String name = field.name;
-
-      // Keep track of whether or not we're dealing with a field mixin
-      // into a native class.
-      bool isMixinNativeField =
-          isClass && element.isNative && holder.isMixinApplication;
-
-      // See if we can dynamically create getters and setters.
-      // We can only generate getters and setters for [element] since
-      // the fields of super classes could be overwritten with getters or
-      // setters.
-      bool needsGetter = false;
-      bool needsSetter = false;
-      if (isLibrary || isMixinNativeField || holder == element) {
-        needsGetter = fieldNeedsGetter(field);
-        needsSetter = fieldNeedsSetter(field);
-      }
-
-      if ((isInstantiated && !holder.isNative)
-          || needsGetter
-          || needsSetter) {
-        String accessorName = namer.fieldAccessorName(field);
-        String fieldName = namer.fieldPropertyName(field);
-        bool needsCheckedSetter = false;
-        if (compiler.enableTypeAssertions
-            && needsSetter
-            && !canAvoidGeneratedCheckedSetter(field)) {
-          needsCheckedSetter = true;
-          needsSetter = false;
-        }
-        // Getters and setters with suffixes will be generated dynamically.
-        f(field, fieldName, accessorName, needsGetter, needsSetter,
-          needsCheckedSetter);
-      }
-    }
-
-    if (isLibrary) {
-      LibraryElement library = element;
-      library.implementation.forEachLocalMember((Element member) {
-        if (member.isField) visitField(library, member);
-      });
-    } else if (visitStatics) {
-      ClassElement cls = element;
-      cls.implementation.forEachStaticField(visitField);
-    } else {
-      ClassElement cls = element;
-      // TODO(kasperl): We should make sure to only emit one version of
-      // overridden fields. Right now, we rely on the ordering so the
-      // fields pulled in from mixins are replaced with the fields from
-      // the class definition.
-
-      // If a class is not instantiated then we add the field just so we can
-      // generate the field getter/setter dynamically. Since this is only
-      // allowed on fields that are in [element] we don't need to visit
-      // superclasses for non-instantiated classes.
-      cls.implementation.forEachInstanceField(
-          visitField, includeSuperAndInjectedMembers: isInstantiated);
-    }
-  }
-
-  void recordMangledField(Element member,
-                          String accessorName,
-                          String memberName) {
-    if (!backend.shouldRetainGetter(member)) return;
-    String previousName;
-    if (member.isInstanceMember) {
-      previousName = emitter.mangledFieldNames.putIfAbsent(
-          '${namer.getterPrefix}$accessorName',
-          () => memberName);
-    } else {
-      previousName = emitter.mangledGlobalFieldNames.putIfAbsent(
-          accessorName,
-          () => memberName);
-    }
-    assert(invariant(member, previousName == memberName,
-                     message: '$previousName != ${memberName}'));
-  }
-
-  bool fieldNeedsGetter(VariableElement field) {
-    assert(field.isField);
-    if (fieldAccessNeverThrows(field)) return false;
-    return backend.shouldRetainGetter(field)
-        || compiler.codegenWorld.hasInvokedGetter(field, compiler.world);
-  }
-
-  bool fieldNeedsSetter(VariableElement field) {
-    assert(field.isField);
-    if (fieldAccessNeverThrows(field)) return false;
-    return (!field.isFinal && !field.isConst)
-        && (backend.shouldRetainSetter(field)
-            || compiler.codegenWorld.hasInvokedSetter(field, compiler.world));
-  }
-
-  // We never access a field in a closure (a captured variable) without knowing
-  // that it is there.  Therefore we don't need to use a getter (that will throw
-  // if the getter method is missing), but can always access the field directly.
-  static bool fieldAccessNeverThrows(VariableElement field) {
-    return field is ClosureFieldElement;
-  }
-
-  bool canAvoidGeneratedCheckedSetter(VariableElement member) {
-    // We never generate accessors for top-level/static fields.
-    if (!member.isInstanceMember) return true;
-    DartType type = member.type;
-    return type.treatAsDynamic || (type.element == compiler.objectClass);
-  }
-
-  void generateCheckedSetter(Element member,
-                             String fieldName,
-                             String accessorName,
-                             ClassBuilder builder) {
-    jsAst.Expression code = backend.generatedCode[member];
-    assert(code != null);
-    String setterName = namer.setterNameFromAccessorName(accessorName);
-    compiler.dumpInfoTask.registerElementAst(member,
-        builder.addProperty(setterName, code));
-    generateReflectionDataForFieldGetterOrSetter(
-        member, setterName, builder, isGetter: false);
-  }
-
-  void generateGetter(Element member, String fieldName, String accessorName,
-                      ClassBuilder builder) {
-    jsAst.Expression function =
-        _stubGenerator.generateGetter(member, fieldName);
-
-    String getterName = namer.getterNameFromAccessorName(accessorName);
-    ClassElement cls = member.enclosingClass;
-    String className = namer.getNameOfClass(cls);
-    OutputUnit outputUnit =
-        compiler.deferredLoadTask.outputUnitForElement(member);
-    emitter.cspPrecompiledFunctionFor(outputUnit).add(
-        js('#.prototype.# = #', [className, getterName, function]));
-    if (backend.isAccessibleByReflection(member)) {
-      emitter.cspPrecompiledFunctionFor(outputUnit).add(
-          js('#.prototype.#.${namer.reflectableField} = 1',
-              [className, getterName]));
-    }
-  }
-
-  void generateSetter(Element member, String fieldName, String accessorName,
-                      ClassBuilder builder) {
-    jsAst.Expression function =
-        _stubGenerator.generateSetter(member, fieldName);
-
-    String setterName = namer.setterNameFromAccessorName(accessorName);
-    ClassElement cls = member.enclosingClass;
-    String className = namer.getNameOfClass(cls);
-    OutputUnit outputUnit =
-        compiler.deferredLoadTask.outputUnitForElement(member);
-    emitter.cspPrecompiledFunctionFor(outputUnit).add(
-        js('#.prototype.# = #', [className, setterName, function]));
-    if (backend.isAccessibleByReflection(member)) {
-      emitter.cspPrecompiledFunctionFor(outputUnit).add(
-          js('#.prototype.#.${namer.reflectableField} = 1',
-              [className, setterName]));
-    }
-  }
-
-  void generateReflectionDataForFieldGetterOrSetter(Element member,
-                                                    String name,
-                                                    ClassBuilder builder,
-                                                    {bool isGetter}) {
-    Selector selector = isGetter
-        ? new Selector.getter(member.name, member.library)
-        : new Selector.setter(member.name, member.library);
-    String reflectionName = emitter.getReflectionName(selector, name);
-    if (reflectionName != null) {
-      var reflectable =
-          js(backend.isAccessibleByReflection(member) ? '1' : '0');
-      builder.addProperty('+$reflectionName', reflectable);
-    }
-  }
-
-  void emitTypeVariableReaders(ClassElement cls, ClassBuilder builder) {
-    List typeVariables = [];
-    ClassElement superclass = cls;
-    while (superclass != null) {
-      for (TypeVariableType parameter in superclass.typeVariables) {
-        if (backend.emitter.readTypeVariables.contains(parameter.element)) {
-          emitTypeVariableReader(cls, builder, parameter.element);
-        }
-      }
-      superclass = superclass.superclass;
-    }
-  }
-
-  void emitTypeVariableReader(ClassElement cls,
-                              ClassBuilder builder,
-                              TypeVariableElement element) {
-    String name = namer.readTypeVariableName(element);
-    jsAst.Expression index =
-        js.number(RuntimeTypes.getTypeVariableIndex(element));
-    jsAst.Expression computeTypeVariable;
-
-    Substitution substitution =
-        backend.rti.computeSubstitution(
-            cls, element.typeDeclaration, alwaysGenerateFunction: true);
-    if (substitution != null) {
-      jsAst.Expression typeArguments =
-          js(r'#.apply(null, this.$builtinTypeInfo)',
-              substitution.getCode(backend.rti, true));
-      computeTypeVariable = js('#[#]', [typeArguments, index]);
-    } else {
-      // TODO(ahe): These can be generated dynamically.
-      computeTypeVariable =
-          js(r'this.$builtinTypeInfo && this.$builtinTypeInfo[#]', index);
-    }
-    jsAst.Expression convertRtiToRuntimeType =
-        namer.elementAccess(backend.findHelper('convertRtiToRuntimeType'));
-    compiler.dumpInfoTask.registerElementAst(element,
-        builder.addProperty(name,
-            js('function () { return #(#) }',
-                [convertRtiToRuntimeType, computeTypeVariable])));
-  }
-}