- Skip old objects early while scavenging.

runtime/vm/scavenger.cc

 // 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.
 
 #include "vm/scavenger.h"
 
 #include "vm/dart.h"
 #include "vm/dart_api_state.h"
 #include "vm/isolate.h"
 #include "vm/object.h"
@@ skipping 49 matching lines @@
   }
 
  private:
   void UpdateStoreBuffer(RawObject** p, RawObject* obj) {
     // TODO(iposva): Implement store buffers.
   }
 
   void ScavengePointer(RawObject** p) {
     RawObject* raw_obj = *p;
 
-    // Fast exit if the raw object is a Smi.
-    if (!raw_obj->IsHeapObject()) return;
+    // Fast exit if the raw object is a Smi or an old object.
+    if (!raw_obj->IsHeapObject() || raw_obj->IsOldObject()) {
+      return;
+    }
 
     uword raw_addr = RawObject::ToAddr(raw_obj);
     // Objects should be contained in the heap.
     // TODO(iposva): Add an appropriate assert here or in the return block
     // below.
     // The scavenger is only interested in objects located in the from space.
     if (!scavenger_->from_->Contains(raw_addr)) {
       return;
     }
 
@@ skipping 325 matching lines @@
     OS::PrintErr(" done.\n");
   }
 
   count_++;
   // Done scavenging. Reset the marker.
   ASSERT(scavenging_);
   scavenging_ = false;
 }
 
 }  // namespace dart