dart2js cps: Make Identical a built-in and add Interceptor to Tree IR.

pkg/compiler/lib/src/js_backend/codegen/js_tree_builder.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.
-
-library js_tree_ir_builder;
-
-import '../../tree_ir/tree_ir_builder.dart' show Builder;
-import 'glue.dart' show Glue;
-import '../../dart2jslib.dart' show Selector, InternalErrorFunction;
-import '../../elements/elements.dart';
-import '../../cps_ir/cps_ir_nodes.dart' as cps_ir;
-import '../../tree_ir/tree_ir_nodes.dart';
-
-/// Subclass of [Builder] that can translate nodes which are specific to the
-/// JavaScript backend.
-class JsTreeBuilder extends Builder {
-  final Glue _glue;
-  final Element identicalFunction;
-
-  JsTreeBuilder(
-      InternalErrorFunction internalError,
-      this.identicalFunction,
-      this._glue,
-      [Builder parent])
-    : super(internalError, parent);
-
-  JsTreeBuilder createInnerBuilder() {
-    return new JsTreeBuilder(internalError, identicalFunction, _glue, this);
-  }
-
-  Selector get identicalSelector {
-    return new Selector.call('identical', null, 2);
-  }
-
-  Expression visitIdentical(cps_ir.Identical node) {
-    return new InvokeStatic(
-        identicalFunction,
-        identicalSelector,
-        <Expression>[getVariableUse(node.left),
-                     getVariableUse(node.right)])..isEffectivelyConstant = true;
-  }
-
-  Expression visitInterceptor(cps_ir.Interceptor node) {
-    Element getInterceptor = _glue.getInterceptorMethod;
-    String name = _glue.getInterceptorName(node.interceptedClasses);
-    Selector selector = new Selector.call(name, null, 1);
-    _glue.registerUseInterceptorInCodegen();
-    return new InvokeStatic(
-        getInterceptor,
-        selector,
-        <Expression>[getVariableUse(node.input)])..isEffectivelyConstant = true;
-  }
-
-  Expression visitGetField(cps_ir.GetField node) {
-    return new GetField(getVariableUse(node.object), node.field);
-  }
-
-  Statement visitSetField(cps_ir.SetField node) {
-    SetField setField =
-        new SetField(getVariableUse(node.object),
-                     node.field,
-                     getVariableUse(node.value));
-    return new ExpressionStatement(setField, visit(node.body));
-  }
-
-  Expression visitCreateBox(cps_ir.CreateBox node) {
-    return new CreateBox();
-  }
-
-  Expression visitCreateInstance(cps_ir.CreateInstance node) {
-    return new CreateInstance(
-        node.classElement,
-        node.arguments.map(getVariableUse).toList(growable: false),
-        node.typeInformation.map(getVariableUse).toList(growable: false));
-  }
-
-  Expression visitCreateInvocationMirror(cps_ir.CreateInvocationMirror node) {
-    return new CreateInvocationMirror(node.selector,
-        node.arguments.map(getVariableUse).toList(growable: false));
-  }
-
-  Statement visitForeignCode(cps_ir.ForeignCode node) {
-    if (node.codeTemplate.isExpression) {
-      Expression foreignCode = new ForeignExpression(
-          node.codeTemplate,
-          node.type,
-          node.arguments.map(getVariableUse).toList(growable: false),
-          node.nativeBehavior,
-          node.dependency);
-      return continueWithExpression(node.continuation, foreignCode);
-    } else {
-      assert(node.continuation == null);
-      return new ForeignStatement(
-          node.codeTemplate,
-          node.type,
-          node.arguments.map(getVariableUse).toList(growable: false),
-          node.nativeBehavior,
-          node.dependency);
-    }
-  }
-}