Check mark bit when verifying heap.

runtime/vm/verifier.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_VERIFIER_H_
 #define VM_VERIFIER_H_
 
 #include "vm/flags.h"
 #include "vm/globals.h"
 #include "vm/handles.h"
 #include "vm/visitor.h"
 
 namespace dart {
 
 // Forward declarations.
 class Isolate;
 class ObjectSet;
 class RawObject;
 
+
+enum MarkExpectation {
+  kForbidMarked,
+  kAllowMarked,
+  kRequireMarked
+};
+
+
 class VerifyObjectVisitor : public ObjectVisitor {
  public:
-  VerifyObjectVisitor(Isolate* isolate, ObjectSet* allocated_set)
+  VerifyObjectVisitor(Isolate* isolate,
+                     ObjectSet* allocated_set,
+                     MarkExpectation mark_expectation)
       : ObjectVisitor(isolate),
-        allocated_set_(allocated_set) {
+        allocated_set_(allocated_set),
+        mark_expectation_(mark_expectation) {
   }
 
   virtual void VisitObject(RawObject* obj);
 
  private:
   ObjectSet* allocated_set_;
+  MarkExpectation mark_expectation_;
 
   DISALLOW_COPY_AND_ASSIGN(VerifyObjectVisitor);
 };
 
 // A sample object pointer visitor implementation which verifies that
 // the pointers visited are contained in the isolate heap.
 class VerifyPointersVisitor : public ObjectPointerVisitor {
  public:
   explicit VerifyPointersVisitor(Isolate* isolate, ObjectSet* allocated_set)
       : ObjectPointerVisitor(isolate),
         allocated_set_(allocated_set) {
   }
 
   virtual void VisitPointers(RawObject** first, RawObject** last);
 
-  static void VerifyPointers();
+  static void VerifyPointers(MarkExpectation mark_expectation = kForbidMarked);
 
  private:
   ObjectSet* allocated_set_;
 
   DISALLOW_COPY_AND_ASSIGN(VerifyPointersVisitor);
 };
 
 class VerifyWeakPointersVisitor : public HandleVisitor {
  public:
   explicit VerifyWeakPointersVisitor(VerifyPointersVisitor* visitor)
       :  HandleVisitor(Isolate::Current()),
          visitor_(visitor) {
   }
 
   virtual void VisitHandle(uword addr);
 
  private:
   ObjectPointerVisitor* visitor_;
 
   ObjectSet* allocated_set;
 
   DISALLOW_COPY_AND_ASSIGN(VerifyWeakPointersVisitor);
 };
 
 }  // namespace dart
 
 #endif  // VM_VERIFIER_H_