Rename NoGCScope -> NoSafepointScope.

runtime/vm/heap.h

 // 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.
 
 #ifndef VM_HEAP_H_
 #define VM_HEAP_H_
 
 #include "platform/assert.h"
 #include "vm/allocation.h"
 #include "vm/flags.h"
@@ skipping 107 matching lines @@
   void IterateNewObjects(ObjectVisitor* visitor) const;
   void IterateOldObjects(ObjectVisitor* visitor) const;
 
   // Find an object by visiting all pointers in the specified heap space,
   // the 'visitor' is used to determine if an object is found or not.
   // The 'visitor' function should be set up to return true if the
   // object is found, traversal through the heap space stops at that
   // point.
   // The 'visitor' function should return false if the object is not found,
   // traversal through the heap space continues.
-  // Returns null object if nothing is found. Must be called within a NoGCScope.
+  // Returns null object if nothing is found. Must be called within a
+  // NoSafepointScope.
   RawInstructions* FindObjectInCodeSpace(FindObjectVisitor* visitor) const;
   RawObject* FindOldObject(FindObjectVisitor* visitor) const;
   RawObject* FindNewObject(FindObjectVisitor* visitor) const;
   RawObject* FindObject(FindObjectVisitor* visitor) const;
 
   void CollectGarbage(Space space);
   void CollectGarbage(Space space, ApiCallbacks api_callbacks, GCReason reason);
   void CollectAllGarbage();
 
   // Enables growth control on the page space heaps.  This should be
@@ skipping 189 matching lines @@
 class GCEvent {
  public:
   explicit GCEvent(const Heap::GCStats& stats)
       : stats_(stats) {}
   void PrintJSON(JSONStream* js) const;
  private:
   const Heap::GCStats& stats_;
 };
 
 
+// Within a NoSafepointScope, the thread must not reach any safepoint. Used
+// around code that manipulates raw object pointers directly without handles.
 #if defined(DEBUG)
-class NoGCScope : public StackResource {
+class NoSafepointScope : public StackResource {
  public:
-  NoGCScope();
-  ~NoGCScope();
+  NoSafepointScope();
+  ~NoSafepointScope();
  private:
-  DISALLOW_COPY_AND_ASSIGN(NoGCScope);
+  DISALLOW_COPY_AND_ASSIGN(NoSafepointScope);
 };
 #else  // defined(DEBUG)
-class NoGCScope : public ValueObject {
+class NoSafepointScope : public ValueObject {
  public:
-  NoGCScope() {}
+  NoSafepointScope() {}
  private:
-  DISALLOW_COPY_AND_ASSIGN(NoGCScope);
+  DISALLOW_COPY_AND_ASSIGN(NoSafepointScope);
 };
 #endif  // defined(DEBUG)
 
 
 class NoHeapGrowthControlScope : public StackResource {
  public:
   NoHeapGrowthControlScope();
   ~NoHeapGrowthControlScope();
  private:
   bool current_growth_controller_state_;
   DISALLOW_COPY_AND_ASSIGN(NoHeapGrowthControlScope);
 };
 
 }  // namespace dart
 
 #endif  // VM_HEAP_H_