dart2js: add function coverage tracking in dart2js output, dumpinfo, and

pkg/compiler/lib/src/js_emitter/full_emitter/emitter.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 dart2js.js_emitter.full_emitter;
 
 import 'dart:convert';
 import 'dart:collection' show HashMap;
 
 import 'package:js_runtime/shared/embedded_names.dart' as embeddedNames;
@@ skipping 1420 matching lines @@
          #helper.schemaChange = #schemaChange;
          #helper.addMethod = #addMethod;
          #helper.extractStubs =
            function(array, name, isStatic, originalDescriptor) {
              var descriptor = Object.create(null);
              this.addStubs(descriptor, array, name, isStatic, []);
              return descriptor;
             };
        }
 
+       if (#hasInstrumentation) {
+         var __record_buffer = []; // TODO(sigmund): define as a proper global.
+         function __record_use(id, name) {
+           if (__record_buffer.length == 0) {
+             window.setTimeout(function () {
+               var xhr = new XMLHttpRequest();
+               xhr.open("POST", "/coverage_uri_to_amend_by_server");
+               xhr.send(JSON.stringify(__record_buffer));
+               __record_buffer = [];
+             }, 1000);
+           }
+           __record_buffer.push([id, name]);
+         }
+       }
+
        if (#isProgramSplit) {
          /// We collect all the global state, so it can be passed to the
          /// initializer of deferred files.
          var #globalsHolder = Object.create(null)
        }
 
        // [map] returns an object that V8 shouldn't try to optimize with a
        // hidden class. This prevents a potential performance problem where V8
        // tries to build a hidden class for an object used as a hashMap.
        // It requires fewer characters to declare a variable as a parameter than
@@ skipping 72 matching lines @@
        #convertGlobalObjectsToFastObjects;
        #debugFastObjects;
 
        #init;
 
        #main;
     })();
     """, {
       "disableVariableRenaming": js.comment("/* ::norenaming:: */"),
       "hasIncrementalSupport": compiler.hasIncrementalSupport,
+      // TODO(sigmund): add flag
+      "hasInstrumentation": const bool.fromEnvironment('instrumentForCoverage')
+          && compiler.dumpInfo,
       "helper": js('this.#', [namer.incrementalHelperName]),
       "schemaChange": buildSchemaChangeFunction(),
       "addMethod": buildIncrementalAddMethod(),
       "isProgramSplit": isProgramSplit,
       "supportsDirectProtoAccess": buildSupportsDirectProtoAccess(),
       "globalsHolder": globalsHolder,
       "globalObjectSetup": buildGlobalObjectSetup(isProgramSplit),
       "isolateName": namer.isolateName,
       "isolatePropertiesName": js(isolatePropertiesName),
       "initName": initName,
@@ skipping 574 matching lines @@
     for (Element element in compiler.enqueuer.codegen.newlyEnqueuedElements) {
       if (element.isInstanceMember) {
         cachedClassBuilders.remove(element.enclosingClass);
 
         nativeEmitter.cachedBuilders.remove(element.enclosingClass);
 
       }
     }
   }
 }