- Implement a simple old-generation marker.

vm/heap.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_HEAP_H_
 #define VM_HEAP_H_
 
 #include "vm/allocation.h"
 #include "vm/flags.h"
 #include "vm/globals.h"
@@ skipping 35 matching lines @@
       default:
         UNREACHABLE();
     }
     return 0;
   }
 
   // Heap contains the specified address.
   bool Contains(uword addr) const;
   bool CodeContains(uword addr) const;
 
+  // Visit all pointers in the space.
+  void IterateNewPointers(ObjectPointerVisitor* visitor);
+  void IterateOldPointers(ObjectPointerVisitor* visitor);
+
+  void CollectGarbage(Space space);
+  void CollectAllGarbage();
+
+  // Accessors for inlined allocation in generated code.
+  uword TopAddress();
+  uword EndAddress();
+  static intptr_t new_space_offset() { return OFFSET_OF(Heap, new_space_); }
+
   // Initialize the heap and register it with the isolate.
   static void Init(Isolate* isolate);
 
   // Verify that all pointers in the heap point to the heap.
   bool Verify() const;
 
-  void IterateOldPointers(ObjectPointerVisitor* visitor);
-
-  // Accessors for inlined allocation in generated code.
-  uword TopAddress();
-  uword EndAddress();
-  static intptr_t new_space_offset() { return OFFSET_OF(Heap, new_space_); }
-
  private:
   Heap();
 
   uword AllocateNew(intptr_t size);
   uword AllocateOld(intptr_t size);
   uword AllocateCode(intptr_t size);
 
   // The different spaces used for allocation.
   Scavenger* new_space_;
   PageSpace* old_space_;
@@ skipping 16 matching lines @@
  public:
   NoGCScope() {}
  private:
   DISALLOW_COPY_AND_ASSIGN(NoGCScope);
 };
 #endif  // defined(DEBUG)
 
 }  // namespace dart
 
 #endif  // VM_HEAP_H_