Add SourceInformationFactory.

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';
 
 import '../js_backend.dart';
 import '../../constants/constant_system.dart';
 import '../../dart2jslib.dart';
 import '../../cps_ir/cps_ir_nodes.dart' as cps;
 import '../../cps_ir/cps_ir_builder.dart';
 import '../../cps_ir/cps_ir_integrity.dart';
 import '../../cps_ir/cps_ir_builder_task.dart';
 import '../../tree_ir/tree_ir_nodes.dart' as tree_ir;
 import '../../types/types.dart' show TypeMask, UnionTypeMask, FlatTypeMask,
     ForwardingTypeMask;
 import '../../elements/elements.dart';
 import '../../js/js.dart' as js;
-import '../../io/source_information.dart' show StartEndSourceInformation;
+import '../../io/source_information.dart' show SourceInformationFactory;
 import '../../tree_ir/tree_ir_builder.dart' as tree_builder;
 import '../../dart_backend/backend_ast_emitter.dart' as backend_ast_emitter;
 import '../../cps_ir/optimizers.dart';
 import '../../cps_ir/optimizers.dart' as cps_opt;
 import '../../tracer.dart';
 import '../../js_backend/codegen/codegen.dart';
 import '../../ssa/ssa.dart' as ssa;
 import '../../tree_ir/optimization/optimization.dart';
 import '../../tree_ir/optimization/optimization.dart' as tree_opt;
 import '../../tree_ir/tree_ir_integrity.dart';
 import '../../cps_ir/cps_ir_nodes_sexpr.dart';
 import 'js_tree_builder.dart';
 
 class CpsFunctionCompiler implements FunctionCompiler {
   final ConstantSystem constantSystem;
   final Compiler compiler;
   final Glue glue;
+  final SourceInformationFactory sourceInformationFactory;
 
   TypeSystem types;
 
   // TODO(karlklose,sigurm): remove and update dart-doc of [compile].
   final FunctionCompiler fallbackCompiler;
 
   Tracer get tracer => compiler.tracer;
 
   IrBuilderTask get irBuilderTask => compiler.irBuilder;
 
   CpsFunctionCompiler(Compiler compiler, JavaScriptBackend backend,
-                      {bool generateSourceMap: true})
+                      SourceInformationFactory sourceInformationFactory)
       : fallbackCompiler =
-            new ssa.SsaFunctionCompiler(backend, generateSourceMap),
+            new ssa.SsaFunctionCompiler(backend, sourceInformationFactory),
+        this.sourceInformationFactory = sourceInformationFactory,
         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 148 matching lines @@
     applyTreePass(new LoopRewriter());
     applyTreePass(new LogicalRewriter());
     applyTreePass(new PullIntoInitializers());
 
     return node;
   }
 
   js.Fun compileToJavaScript(CodegenWorkItem work,
                              tree_ir.FunctionDefinition definition) {
     CodeGenerator codeGen = new CodeGenerator(glue, work.registry);
-
     return attachPosition(codeGen.buildFunction(definition), work.element);
   }
 
   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));
+        sourceInformationFactory.forContext(element)
+            .buildDeclaration(element));
   }
 }