CPS implementation of throw and rethrow.

pkg/compiler/lib/src/js_backend/codegen/codegen.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 code_generator;
 
 import 'glue.dart';
 
 import '../../tree_ir/tree_ir_nodes.dart' as tree_ir;
 import '../../js/js.dart' as js;
@@ skipping 507 matching lines @@
     accumulator.add(
         buildWhile(new js.LiteralBool(true), node.body, node.label, node));
   }
 
   @override
   void visitReturn(tree_ir.Return node) {
     accumulator.add(new js.Return(visitExpression(node.value)));
   }
 
   @override
+  void visitThrow(tree_ir.Throw node) {
+    accumulator.add(new js.Throw(visitExpression(node.value)));
+  }
+
+  @override
+  void visitRethrow(tree_ir.Rethrow node) {
+    glue.reportInternalError('rethrow seen in JavaScript output');
+  }
+
+  @override
   void visitTry(tree_ir.Try node) {
     js.Block tryBlock = buildBodyBlock(node.tryBody);
     tree_ir.Variable exceptionVariable = node.catchParameters.first;
     js.VariableDeclaration exceptionParameter =
         new js.VariableDeclaration(getVariableName(exceptionVariable));
     js.Block catchBlock = buildBodyBlock(node.catchBody);
     js.Catch catchPart = new js.Catch(exceptionParameter, catchBlock);
     accumulator.add(new js.Try(tryBlock, catchPart, null));
   }
 
@@ skipping 102 matching lines @@
 
   @override
   visitVariableDeclaration(tree_ir.VariableDeclaration node) {
     return errorUnsupportedNode(node);
   }
 
   errorUnsupportedNode(tree_ir.DartSpecificNode node) {
     throw "Unsupported node in JS backend: $node";
   }
 }