1. Added new flag verify_gc_contains and moved all the asserts that do a

runtime/vm/pages.cc

 // 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.
 
 #include "vm/pages.h"
 
 #include "platform/assert.h"
 #include "vm/compiler_stats.h"
 #include "vm/gc_marker.h"
 #include "vm/gc_sweeper.h"
@@ skipping 582 matching lines @@
   }
   for (ExclusivePageIterator it(this); !it.Done(); it.Advance()) {
     if ((it.page()->type() == type) && it.page()->Contains(addr)) {
       return true;
     }
   }
   return false;
 }
 
 
+bool PageSpace::DataContains(uword addr) const {
+  for (ExclusivePageIterator it(this); !it.Done(); it.Advance()) {
+    if ((it.page()->type() != HeapPage::kExecutable) &&
+        it.page()->Contains(addr)) {
+      return true;
+    }
+  }
+  return false;
+}
+
+
 void PageSpace::AddRegionsToObjectSet(ObjectSet* set) const {
   ASSERT((pages_ != NULL) || (exec_pages_ != NULL) || (large_pages_ != NULL));
   for (ExclusivePageIterator it(this); !it.Done(); it.Advance()) {
     set->AddRegion(it.page()->object_start(), it.page()->object_end());
   }
 }
 
 
 void PageSpace::VisitObjects(ObjectVisitor* visitor) const {
   for (ExclusivePageIterator it(this); !it.Done(); it.Advance()) {
@@ skipping 645 matching lines @@
     return 0;
   } else {
     ASSERT(total_time >= gc_time);
     int result = static_cast<int>(
         (static_cast<double>(gc_time) / static_cast<double>(total_time)) * 100);
     return result;
   }
 }
 
 }  // namespace dart