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

pkg/compiler/lib/src/js_backend/backend.dart

 // Copyright (c) 2012, 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.
 
 part of js_backend;
 
 const VERBOSE_OPTIMIZER_HINTS = false;
 
 class JavaScriptItemCompilationContext extends ItemCompilationContext {
   final Set<HInstruction> boundsChecked = new Set<HInstruction>();
@@ skipping 315 matching lines @@
   ClassElement noSideEffectsClass;
   ClassElement noThrowsClass;
   ClassElement noInlineClass;
   ClassElement forceInlineClass;
   ClassElement irRepresentationClass;
 
   Element getInterceptorMethod;
 
   ClassElement jsInvocationMirrorClass;
 
-  /// If [true], the compiler will emit code that writes the name of the current
-  /// method together with its class and library to the console the first time
-  /// the method is called.
-  static const bool TRACE_CALLS = false;
+  /// If [true], the compiler will emit code that logs whenever a method is
+  /// called. When TRACE_METHOD is 'console' this will be logged
+  /// directly in the JavaScript console. When TRACE_METHOD is 'post' the
+  /// information will be sent to a server via a POST request.
+  static const String TRACE_METHOD = const String.fromEnvironment('traceCalls');
+  static const bool TRACE_CALLS =
+    TRACE_METHOD == 'post' || TRACE_METHOD == 'console';
   Element traceHelper;
 
   TypeMask get stringType => compiler.typesTask.stringType;
   TypeMask get doubleType => compiler.typesTask.doubleType;
   TypeMask get intType => compiler.typesTask.intType;
   TypeMask get uint32Type => compiler.typesTask.uint32Type;
   TypeMask get uint31Type => compiler.typesTask.uint31Type;
   TypeMask get positiveIntType => compiler.typesTask.positiveIntType;
   TypeMask get numType => compiler.typesTask.numType;
   TypeMask get boolType => compiler.typesTask.boolType;
@@ skipping 803 matching lines @@
     addInterceptors(jsNullClass, world, registry);
     if (compiler.enableTypeAssertions) {
       // Unconditionally register the helper that checks if the
       // expression in an if/while/for is a boolean.
       // TODO(ngeoffray): Should we have the resolver register those instead?
       Element e = findHelper('boolConversionCheck');
       if (e != null) enqueue(world, e, registry);
     }
 
     if (TRACE_CALLS) {
-      traceHelper = findHelper('traceHelper');
+      traceHelper = findHelper(
+          TRACE_METHOD == 'console' ? 'consoleTraceHelper' : 'postTraceHelper');
       assert(traceHelper != null);
       enqueueInResolution(traceHelper, registry);
     }
     registerCheckedModeHelpers(registry);
   }
 
   onResolutionComplete() {
     super.onResolutionComplete();
     computeMembersNeededForReflection();
     rti.computeClassesNeedingRti();
@@ skipping 1895 matching lines @@
   }
 }
 
 /// Records that [constant] is used by the element behind [registry].
 class Dependency {
   final ConstantValue constant;
   final Element annotatedElement;
 
   const Dependency(this.constant, this.annotatedElement);
 }