Make incremental marking clear ICs.

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 191 matching lines @@
           rinfo->IsPatchedReturnSequence()) ||
          (RelocInfo::IsDebugBreakSlot(rinfo->rmode()) &&
           rinfo->IsPatchedDebugBreakSlotSequence()));
   Code* target = Code::GetCodeFromTargetAddress(rinfo->call_address());
   heap->mark_compact_collector()->RecordRelocSlot(rinfo, target);
   StaticVisitor::MarkObject(heap, target);
 }
 
 
 template<typename StaticVisitor>
+void StaticMarkingVisitor<StaticVisitor>::VisitCodeTarget(
+    Heap* heap, RelocInfo* rinfo) {
+  ASSERT(RelocInfo::IsCodeTarget(rinfo->rmode()));
+  Code* target = Code::GetCodeFromTargetAddress(rinfo->target_address());
+  // Monomorphic ICs are preserved when possible, but need to be flushed
+  // when they might be keeping a Context alive, or when the heap is about
+  // to be serialized.
+  if (FLAG_cleanup_code_caches_at_gc && target->is_inline_cache_stub()
+      && (target->ic_state() == MEGAMORPHIC || Serializer::enabled() ||
+          heap->isolate()->context_exit_happened() ||
+          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>::VisitGlobalContext(
     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::GLOBAL_CONTEXT_SLOTS;
        ++idx) {
@@ skipping 78 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_