implement LabeledStatement and Break in kernel

pkg/compiler/lib/src/ssa/kernel_ast_adapter.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 'package:js_runtime/shared/embedded_names.dart';
 import 'package:kernel/ast.dart' as ir;
 
-import '../constants/expressions.dart';
 import '../common.dart';
 import '../common/names.dart';
 import '../compiler.dart';
+import '../constants/expressions.dart';
 import '../constants/values.dart';
 import '../dart_types.dart';
 import '../elements/elements.dart';
+import '../elements/modelx.dart';
 import '../js/js.dart' as js;
 import '../js_backend/backend_helpers.dart';
 import '../js_backend/js_backend.dart';
 import '../kernel/kernel.dart';
 import '../kernel/kernel_debug.dart';
 import '../native/native.dart' as native;
 import '../resolution/tree_elements.dart';
 import '../tree/tree.dart' as ast;
 import '../types/masks.dart';
 import '../types/types.dart';
 import '../universe/call_structure.dart';
 import '../universe/selector.dart';
 import '../universe/side_effects.dart';
 import '../world.dart';
 import 'locals_handler.dart';
 import 'types.dart';
 
 /// A helper class that abstracts all accesses of the AST from Kernel nodes.
 ///
 /// The goal is to remove all need for the AST from the Kernel SSA builder.
 class KernelAstAdapter {
   final Kernel kernel;
   final JavaScriptBackend _backend;
   final ResolvedAst _resolvedAst;
   final Map<ir.Node, ast.Node> _nodeToAst;
   final Map<ir.Node, Element> _nodeToElement;
   final Map<ir.VariableDeclaration, SyntheticLocal> _syntheticLocals =
       <ir.VariableDeclaration, SyntheticLocal>{};
+  final Map<ir.LabeledStatement, KernelJumpTarget> _jumpTargets =
+      <ir.LabeledStatement, KernelJumpTarget>{};
   DartTypeConverter _typeConverter;
 
   KernelAstAdapter(this.kernel, this._backend, this._resolvedAst,
       this._nodeToAst, this._nodeToElement) {
     // TODO(het): Maybe just use all of the kernel maps directly?
     for (FieldElement fieldElement in kernel.fields.keys) {
       _nodeToElement[kernel.fields[fieldElement]] = fieldElement;
     }
     for (FunctionElement functionElement in kernel.functions.keys) {
       _nodeToElement[kernel.functions[functionElement]] = functionElement;
@@ skipping 281 matching lines @@
       return field.constant == null;
     }
     return false;
   }
 
   LibraryElement get jsHelperLibrary => _backend.helpers.jsHelperLibrary;
 
   JumpTarget getTargetDefinition(ir.Node node) =>
       elements.getTargetDefinition(getNode(node));
 
+  JumpTarget getTargetOf(ir.Node node) => elements.getTargetOf(getNode(node));
+
+  KernelJumpTarget getJumpTarget(ir.LabeledStatement labeledStatement) =>
+      _jumpTargets.putIfAbsent(labeledStatement, () {
+        return new KernelJumpTarget();
+      });
+
+  LabelDefinition getTargetLabel(ir.Node node) =>
+      elements.getTargetLabel(getNode(node));
+
   ir.Class get mapLiteralClass =>
       kernel.classes[_backend.helpers.mapLiteralClass];
 
   ir.Procedure get mapLiteralConstructor =>
       kernel.functions[_backend.helpers.mapLiteralConstructor];
 
   ir.Procedure get mapLiteralConstructorEmpty =>
       kernel.functions[_backend.helpers.mapLiteralConstructorEmpty];
 
   ir.Procedure get mapLiteralUntypedEmptyMaker =>
@@ skipping 518 matching lines @@
     astAdapter.reporter.internalError(
         CURRENT_ELEMENT_SPANNABLE, "Unexpected constant target: $element.");
     return null;
   }
 
   @override
   ConstantExpression visitStringLiteral(ir.StringLiteral node) {
     return new StringConstantExpression(node.value);
   }
 }
+
+class KernelJumpTarget extends JumpTarget {
+  static int index = 0;
+
+  KernelJumpTarget() {
+    labels = <LabelDefinition>[
+      new LabelDefinitionX(null, 'l${index++}', this)..setBreakTarget()
+    ];
+  }
+
+  @override
+  bool get isBreakTarget => true;
+
+  set isBreakTarget(bool x) {
+    // do nothing, these are always break targets
+  }
+
+  @override
+  bool get isContinueTarget => false;
+
+  set isContinueTarget(bool x) {
+    // do nothing, these are always break targets
+  }
+
+  @override
+  LabelDefinition addLabel(ast.Label label, String labelName) {
+    LabelDefinition result = new LabelDefinitionX(label, labelName, this);
+    labels.add(result);
+    return result;
+  }
+
+  @override
+  ExecutableElement get executableContext => null;
+
+  @override
+  bool get isSwitch => false;
+
+  @override
+  bool get isTarget => true;
+
+  @override
+  List<LabelDefinition> labels;
+
+  @override
+  String get name => null;
+
+  @override
+  int get nestingLevel => 1;
+
+  @override
+  ast.Node get statement => null;
+}