Age code to allow reclaiming old unexecuted functions

src/objects-visiting-inl.h

 // Copyright 2012 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 211 matching lines @@
           target->ic_age() != heap->global_ic_age())) {
     IC::Clear(rinfo->pc());
     target = Code::GetCodeFromTargetAddress(rinfo->target_address());
   }
   heap->mark_compact_collector()->RecordRelocSlot(rinfo, target);
   StaticVisitor::MarkObject(heap, target);
 }
 
 
 template<typename StaticVisitor>
+void StaticMarkingVisitor<StaticVisitor>::VisitCodeAgeSequence(
+    Heap* heap, RelocInfo* rinfo) {
+  ASSERT(RelocInfo::IsCodeAgeSequence(rinfo->rmode()));
+  Code* target = rinfo->code_age_stub();
+  if (target != NULL) {

[Michael Starzinger, 2012/09/21 09:43:19]

We should only reach this visit function if there actually is a target.

[danno, 2012/10/25 10:07:23]

Done.

+    heap->mark_compact_collector()->RecordRelocSlot(rinfo, target);
+    StaticVisitor::MarkObject(heap, target);
+  }
+}
+
+
+template<typename StaticVisitor>
 void StaticMarkingVisitor<StaticVisitor>::VisitNativeContext(
     Map* map, HeapObject* object) {
   FixedBodyVisitor<StaticVisitor,
                    Context::MarkCompactBodyDescriptor,
                    void>::Visit(map, object);
 
   MarkCompactCollector* collector = map->GetHeap()->mark_compact_collector();
   for (int idx = Context::FIRST_WEAK_SLOT;
        idx < Context::NATIVE_CONTEXT_SLOTS;
        ++idx) {
     Object** slot =
         HeapObject::RawField(object, FixedArray::OffsetOfElementAt(idx));
     collector->RecordSlot(slot, slot, *slot);
   }
 }
 
 
 template<typename StaticVisitor>
 void StaticMarkingVisitor<StaticVisitor>::VisitCode(
     Map* map, HeapObject* object) {
   Heap* heap = map->GetHeap();
   Code* code = Code::cast(object);
+  if (!Serializer::enabled()) {
+    code->MakeOlder();

[Michael Starzinger, 2012/09/21 09:43:19]

We can pass heap->mark_compact_collector()->marking_parity() here.

[danno, 2012/10/25 10:07:23]

Done.

+  }
   if (FLAG_cleanup_code_caches_at_gc) {
     code->ClearTypeFeedbackCells(heap);
   }
   code->CodeIterateBody<StaticVisitor>(heap);
 }
 
 
 template<typename StaticVisitor>
 void StaticMarkingVisitor<StaticVisitor>::VisitJSRegExp(
     Map* map, HeapObject* object) {
@@ skipping 56 matching lines @@
   RelocIterator it(this, mode_mask);
   for (; !it.done(); it.next()) {
     it.rinfo()->template Visit<StaticVisitor>(heap);
   }
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_VISITING_INL_H_