Pass SourceInformation through the CPS IR.

pkg/compiler/lib/src/js_backend/codegen/task.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.
 
 /// Generate code using the cps-based IR pipeline.
 library code_generator_task;
 
 import 'glue.dart';
 import 'codegen.dart';
 import 'unsugar.dart';
@@ skipping 12 matching lines @@
 import '../../dart_backend/backend_ast_emitter.dart' as backend_ast_emitter;
 import '../../cps_ir/optimizers.dart';
 import '../../tracer.dart';
 import '../../js_backend/codegen/codegen.dart';
 import '../../ssa/ssa.dart' as ssa;
 import '../../tree_ir/optimization/optimization.dart';
 import '../../cps_ir/cps_ir_nodes_sexpr.dart';
 import 'js_tree_builder.dart';
 
 class CpsFunctionCompiler implements FunctionCompiler {
-  final IrBuilderTask irBuilderTask;
   final ConstantSystem constantSystem;
   final Compiler compiler;
   final Glue glue;
 
   TypeSystem types;
 
   // TODO(karlklose,sigurm): remove and update dart-doc of [compile].
   final FunctionCompiler fallbackCompiler;
 
   Tracer get tracer => compiler.tracer;
 
-  CpsFunctionCompiler(Compiler compiler, JavaScriptBackend backend)
-      : irBuilderTask = new IrBuilderTask(compiler),
-        fallbackCompiler = new ssa.SsaFunctionCompiler(backend, true),
+  IrBuilderTask get irBuilderTask => compiler.irBuilder;
+
+  CpsFunctionCompiler(Compiler compiler, JavaScriptBackend backend,
+                      {bool generateSourceMap: true})
+      : fallbackCompiler =
+            new ssa.SsaFunctionCompiler(backend, generateSourceMap),
         constantSystem = backend.constantSystem,
         compiler = compiler,
         glue = new Glue(compiler);
 
   String get name => 'CPS Ir pipeline';
 
   /// Generates JavaScript code for `work.element`. First tries to use the
   /// Cps Ir -> tree ir -> js pipeline, and if that fails due to language
   /// features not implemented it will fall back to the ssa pipeline (for
   /// platform code) or will cancel compilation (for user code).
@@ skipping 143 matching lines @@
   Iterable<CompilerTask> get tasks {
     // TODO(sigurdm): Make a better list of tasks.
     return <CompilerTask>[irBuilderTask]..addAll(fallbackCompiler.tasks);
   }
 
   js.Node attachPosition(js.Node node, AstElement element) {
     return node.withSourceInformation(
         StartEndSourceInformation.computeSourceInformation(element));
   }
 }