- Promote objects from new gen to old space if they survived a scavenge.

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/assert.h"
 #include "vm/flags.h"
 #include "vm/globals.h"
 #include "vm/pages.h"
+#include "vm/scavenger.h"
 
 namespace dart {
 
 // Forward declarations.
 class Isolate;
 class ObjectPointerVisitor;
-class PageSpace;
-class Scavenger;
 class VirtualMemory;
 
 DECLARE_FLAG(bool, verbose_gc);
 DECLARE_FLAG(bool, verify_before_gc);
 DECLARE_FLAG(bool, verify_after_gc);
 DECLARE_FLAG(bool, gc_at_alloc);
 
 class Heap {
  public:
   enum Space {
@@ skipping 19 matching lines @@
       case kOld:
         return AllocateOld(size);
       case kExecutable:
         return AllocateCode(size);
       default:
         UNREACHABLE();
     }
     return 0;
   }
 
+  uword TryAllocate(intptr_t size, Space space) {
+    switch (space) {
+      case kNew:
+        return new_space_->TryAllocate(size);
+      case kOld:
+        return old_space_->TryAllocate(size);
+      case kExecutable:
+        return code_space_->TryAllocate(size);
+      default:
+        UNREACHABLE();
+    }
+  }
+
   // 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 IterateCodePointers(ObjectPointerVisitor* visitor);
 
   void CollectGarbage(Space space);
@@ skipping 39 matching lines @@
  public:
   NoGCScope() {}
  private:
   DISALLOW_COPY_AND_ASSIGN(NoGCScope);
 };
 #endif  // defined(DEBUG)
 
 }  // namespace dart
 
 #endif  // VM_HEAP_H_