Add SourceReport, a class for generating Dart source-level reports.

runtime/vm/coverage.cc

 // Copyright (c) 2013, 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.
 
 #include "vm/coverage.h"
 
 #include "include/dart_api.h"
 
 #include "vm/compiler.h"
 #include "vm/isolate.h"
@@ skipping 173 matching lines @@
       }
       if (!filter->ShouldOutputCoverageFor(lib, script, cls, function)) {
         i++;
         continue;
       }
       CompileAndAdd(function, hits_or_sites, pos_to_line, as_call_sites);
       i++;
     }
   }
 
+  // TODO(turnidge): This looks like it prints closures many, many times.
   const GrowableObjectArray& closures = GrowableObjectArray::Handle(
       thread->isolate()->object_store()->closure_functions());
   pos_to_line.Clear();
   // We need to keep rechecking the length of the closures array, as handling
   // a closure potentially adds new entries to the end.
   i = 0;
   while (i < closures.Length()) {
     HANDLESCOPE(thread);
     function ^= closures.At(i);
     if (function.Owner() != cls.raw()) {
@@ skipping 82 matching lines @@
         cls = it.GetNextClass();
         ASSERT(!cls.IsNull());
         PrintClass(lib, cls, jsarr, filter, as_call_sites);
       }
     }
   }
 }
 
 
 }  // namespace dart