Remove assumption from the heap verifier that objects occupy a narrow range of the address space.

runtime/vm/pages.h

 // Copyright (c) 2011, 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.
 
 #ifndef VM_PAGES_H_
 #define VM_PAGES_H_
 
 #include "vm/freelist.h"
 #include "vm/globals.h"
 #include "vm/lockers.h"
 #include "vm/ring_buffer.h"
 #include "vm/spaces.h"
 #include "vm/thread.h"
 #include "vm/virtual_memory.h"
 
 namespace dart {
 
 DECLARE_FLAG(bool, log_code_drop);
 DECLARE_FLAG(bool, always_drop_code);
 DECLARE_FLAG(bool, write_protect_code);
 
 // Forward declarations.
 class Heap;
 class JSONObject;
 class ObjectPointerVisitor;
+class ObjectSet;
 
 // A page containing old generation objects.
 class HeapPage {
  public:
   enum PageType {
     kData = 0,
     kExecutable,
     kReadOnlyData,
     kNumPageTypes
   };
@@ skipping 226 matching lines @@
   RawObject* FindObject(FindObjectVisitor* visitor,
                         HeapPage::PageType type) const;
 
   // Checks if enough time has elapsed since the last attempt to collect
   // code.
   bool ShouldCollectCode();
 
   // Collect the garbage in the page space using mark-sweep.
   void MarkSweep(bool invoke_api_callbacks);
 
-  void StartEndAddress(uword* start, uword* end) const;
+  void AddRegionsToObjectSet(ObjectSet* set) const;
 
   void InitGrowthControl() {
     page_space_controller_.set_last_usage(usage_);
     page_space_controller_.Enable();
   }
 
   void SetGrowthControlState(bool state) {
     if (state) {
       page_space_controller_.Enable();
     } else {
@@ skipping 173 matching lines @@
   friend class HeapIterationScope;
   friend class PageSpaceController;
   friend class SweeperTask;
 
   DISALLOW_IMPLICIT_CONSTRUCTORS(PageSpace);
 };
 
 }  // namespace dart
 
 #endif  // VM_PAGES_H_