Base JavaScript code position computation on JavaScript tracer.

pkg/compiler/lib/src/js_emitter/startup_emitter/model_emitter.dart

 // Copyright (c) 2015, 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 dart2js.js_emitter.startup_emitter.model_emitter;
 
 import 'dart:convert' show JsonEncoder;
 
 import 'package:js_runtime/shared/embedded_names.dart' show
     CLASS_FIELDS_EXTRACTOR,
@@ skipping 263 matching lines @@
             compiler.outputProvider('', 'js'),
             codeOutputListeners);
     outputBuffers[fragment] = mainOutput;
 
     js.Program program = new js.Program([
         buildGeneratedBy(),
         new js.Comment(HOOKS_API_USAGE),
         isSplit ? buildDeferredInitializerGlobal() : new js.Block.empty(),
         code]);
 
-    mainOutput.addBuffer(js.prettyPrint(program, compiler,
+    mainOutput.addBuffer(js.createCodeBuffer(program, compiler,
         monitor: compiler.dumpInfoTask));
 
     if (shouldGenerateSourceMap) {
       mainOutput.add(
           generateSourceMapTag(compiler.sourceMapUri, compiler.outputUri));
     }
 
     mainOutput.close();
 
     if (shouldGenerateSourceMap) {
@@ skipping 33 matching lines @@
     // function in a temporary field first:
     //
     //   deferredInitializer.current = <pretty-printed code>;
     //   deferredInitializer[<hash>] = deferredInitializer.current;
 
     js.Program program = new js.Program([
         buildGeneratedBy(),
         buildDeferredInitializerGlobal(),
         js.js.statement('$deferredInitializersGlobal.current = #', code)]);
 
-    output.addBuffer(js.prettyPrint(program, compiler,
+    output.addBuffer(js.createCodeBuffer(program, compiler,
         monitor: compiler.dumpInfoTask));
 
     // Make a unique hash of the code (before the sourcemaps are added)
     // This will be used to retrieve the initializing function from the global
     // variable.
     String hash = hasher.getHash();
 
     // Now we copy the deferredInitializer.current into its correct hash.
     output.add('\n${deferredInitializersGlobal}["$hash"] = '
         '${deferredInitializersGlobal}.current');
@@ skipping 66 matching lines @@
     // Json does not support comments, so we embed the explanation in the
     // data.
     mapping["_comment"] = "This mapping shows which compiled `.js` files are "
         "needed for a given deferred library import.";
     mapping.addAll(compiler.deferredLoadTask.computeDeferredMap());
     compiler.outputProvider(compiler.deferredMapUri.path, 'deferred_map')
       ..add(const JsonEncoder.withIndent("  ").convert(mapping))
       ..close();
   }
 }