Make VM state tracking to be independent of logging and profiling.

src/spaces.h

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 283 matching lines @@
   virtual ~Space() {}
 
   // Does the space need executable memory?
   Executability executable() { return executable_; }
 
   // Identity used in error reporting.
   AllocationSpace identity() { return id_; }
 
   virtual int Size() = 0;
 
+#ifdef ENABLE_HEAP_PROTECTION
+  // Protect/unprotect the space by marking it read-only/writable.
+  virtual void Protect() = 0;
+  virtual void Unprotect() = 0;
+#endif
+
 #ifdef DEBUG
   virtual void Print() = 0;
 #endif
 
   // After calling this we can allocate a certain number of bytes using only
   // linear allocation (with a LinearAllocationScope and an AlwaysAllocateScope)
   // without using freelists or causing a GC.  This is used by partial
   // snapshots.  It returns true of space was reserved or false if a GC is
   // needed.  For paged spaces the space requested must include the space wasted
   // at the end of each when allocating linearly.
@@ skipping 848 matching lines @@
 
   virtual bool ReserveSpace(int bytes) {
     UNREACHABLE();
     return false;
   }
 
   bool is_committed() { return committed_; }
   bool Commit();
   bool Uncommit();
 
+#ifdef ENABLE_HEAP_PROTECTION
+  // Protect/unprotect the space by marking it read-only/writable.
+  virtual void Protect() {}
+  virtual void Unprotect() {}
+#endif
+
 #ifdef DEBUG
   virtual void Print();
   virtual void Verify();
 #endif
 
   // Returns the current capacity of the semi space.
   int Capacity() { return capacity_; }
 
   // Returns the maximum capacity of the semi space.
   int MaximumCapacity() { return maximum_capacity_; }
@@ skipping 888 matching lines @@
 
  private:
   LargeObjectChunk* current_;
   HeapObjectCallback size_func_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_SPACES_H_