Revert "Reapply "Add TypeVariable object on runtime to support reflection on type variables." and "…

sdk/lib/_internal/compiler/implementation/js_backend/type_variable_handler.dart

Index: sdk/lib/_internal/compiler/implementation/js_backend/type_variable_handler.dart
diff --git a/sdk/lib/_internal/compiler/implementation/js_backend/type_variable_handler.dart b/sdk/lib/_internal/compiler/implementation/js_backend/type_variable_handler.dart
deleted file mode 100644
index 8cddea717845ad65bc7dc80957810f5e183315d7..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/compiler/implementation/js_backend/type_variable_handler.dart
+++ /dev/null
@@ -1,143 +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 js_backend;
-
-/**
- * Handles construction of TypeVariable constants needed at runtime.
- */
-class TypeVariableHandler {
-  JavaScriptBackend backend;
-  FunctionElement typeVariableConstructor;
-  CompileTimeConstantEvaluator evaluator;
-
-  /**
-   * Contains all instantiated classes that have type variables and are needed
-   * for reflection.
-   */
-  List<ClassElement> typeVariableClasses = new List<ClassElement>();
-
-  /**
-   *  Maps a class element to a list with indices that point to type variables
-   *  constants for each of the class' type variables.
-   */
-  Map<ClassElement, List<int>> typeVariables =
-      new Map<ClassElement, List<int>>();
-
-  /**
-   *  Maps a TypeVariableType to the index pointing to the constant representing
-   *  the corresponding type variable at runtime.
-   */
-  Map<TypeVariableElement, int> typeVariableConstants =
-      new Map<TypeVariableElement, int>();
-
-  TypeVariableHandler(this.backend);
-
-  ClassElement get typeVariableClass => backend.typeVariableClass;
-  CodeEmitterTask get task => backend.emitter;
-  MetadataEmitter get emitter => task.metadataEmitter;
-  Compiler get compiler => backend.compiler;
-
-  void registerClassWithTypeVariables(ClassElement cls) {
-    typeVariableClasses.add(cls);
-  }
-
-  void onResolutionQueueEmpty(Enqueuer enqueuer) {
-    if (typeVariableConstructor == null) {
-      if (!typeVariableClass.constructors.isEmpty &&
-          !typeVariableClass.constructors.tail.isEmpty) {
-        compiler.reportInternalError(
-            typeVariableClass,
-            'Class $typeVariableClass should only have one constructor');
-      }
-      typeVariableConstructor = typeVariableClass.constructors.head;
-      backend.enqueueClass(
-          enqueuer, typeVariableClass, compiler.globalDependencies);
-      backend.enqueueInResolution(
-          typeVariableConstructor, compiler.globalDependencies);
-    }
-  }
-
-  void onCodegenQueueEmpty() {
-    evaluator = new CompileTimeConstantEvaluator(
-        compiler.constantHandler, compiler.globalDependencies, compiler);
-
-    for (ClassElement cls in typeVariableClasses) {
-      InterfaceType typeVariableType = typeVariableClass.computeType(compiler);
-      List<int> constants = <int>[];
-      for (TypeVariableType currentTypeVariable in cls.typeVariables) {
-        List<Constant> createArguments(FunctionElement constructor) {
-        if (constructor != typeVariableConstructor) {
-            compiler.internalErrorOnElement(
-                currentTypeVariable.element,
-                'Unexpected constructor $constructor');
-          }
-          Constant name = backend.constantSystem.createString(
-              new DartString.literal(currentTypeVariable.name.slowToString()),
-              null);
-          Constant bound = backend.constantSystem.createInt(
-              emitter.reifyType(currentTypeVariable.element.bound));
-          Constant type = evaluator.makeTypeConstant(cls);
-          return [type, name, bound];
-        }
-
-        Constant c = evaluator.makeConstructedConstant(
-            currentTypeVariable.element, typeVariableType,
-            typeVariableConstructor, createArguments);
-        backend.registerCompileTimeConstant(c, compiler.globalDependencies);
-        compiler.constantHandler.addCompileTimeConstantForEmission(c);
-        constants.add(
-            reifyTypeVariableConstant(c, currentTypeVariable.element));
-      }
-      typeVariables[cls] = constants;
-    }
-    typeVariableClasses.clear();
-  }
-
-  /**
-   * Adds [c] to [emitter.globalMetadata] and returns the index pointing to
-   * the entry.
-   *
-   * If the corresponding type variable has already been encountered an
-   * entry in the list has already been reserved and the constant is added
-   * there, otherwise a new entry for [c] is created.
-   */
-  int reifyTypeVariableConstant(Constant c, TypeVariableElement variable) {
-    String name =
-        jsAst.prettyPrint(task.constantReference(c), compiler).getText();
-    int index;
-    if (typeVariableConstants.containsKey(variable)) {
-      index = typeVariableConstants[variable];
-      emitter.globalMetadata[index] = name;
-    } else {
-      index = emitter.addGlobalMetadata(name);
-      typeVariableConstants[variable] = index;
-    }
-    return index;
-  }
-
-  /**
-   * Returns the index pointing to the constant in [emitter.globalMetadata]
-   * representing this type variable
-   *.
-   *
-   * If the constant has not yet been constructed, an entry is  allocated in
-   * the global metadata list and the index pointing to this entry is returned.
-   * When the corresponding constant is constructed later,
-   * [reifyTypeVariableConstant] will be called and the constant will be added
-   * on the allocated entry.
-   */
-  int reifyTypeVariable(TypeVariableElement variable) {
-    if (typeVariableConstants.containsKey(variable)) {
-      return typeVariableConstants[variable];
-    }
-
-    emitter.globalMetadata.add('Placeholder for ${variable}');
-    return typeVariableConstants[variable] = emitter.globalMetadata.length - 1;
-  }
-
-  List<int> typeVariablesOf(ClassElement classElement) {
-    return typeVariables[classElement];
-  }
-}