Enable incremental code flushing.

src/heap.cc

 // 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 388 matching lines @@
 #endif  // DEBUG
 }
 
 
 void Heap::GarbageCollectionPrologue() {
   isolate_->transcendental_cache()->Clear();
   ClearJSFunctionResultCaches();
   gc_count_++;
   unflattened_strings_length_ = 0;
 
+  bool should_enable_code_flushing = FLAG_flush_code;
+#ifdef ENABLE_DEBUGGER_SUPPORT
+  if (isolate_->debug()->IsLoaded() || isolate_->debug()->has_break_points()) {

[ulan, 2012/10/16 08:09:31]

What if this condition becomes true during incremental marking after we enabled
code flushing? Will it break the debugger?

[Michael Starzinger, 2012/10/16 08:27:54]

When the condition becomes true, the debugger will trigger a GC with
kMakeHeapIterable, which imples kAbortIncrementalMarking. So it's implicitly
aborted. But you are right, this requires a comment either here or in the
debugger. Will add the comment.

+    should_enable_code_flushing = false;
+  }
+#endif
+  mark_compact_collector()->EnableCodeFlushing(should_enable_code_flushing);
+
 #ifdef VERIFY_HEAP
   if (FLAG_verify_heap) {
     Verify();
   }
 #endif
 
 #ifdef DEBUG
   ASSERT(allocation_allowed_ && gc_state_ == NOT_IN_GC);
   allow_allocation(false);
 
@@ skipping 6921 matching lines @@
       static_cast<int>(object_sizes_last_time_[index]));
   FIXED_ARRAY_SUB_INSTANCE_TYPE_LIST(ADJUST_LAST_TIME_OBJECT_COUNT)
 #undef ADJUST_LAST_TIME_OBJECT_COUNT
 
   memcpy(object_counts_last_time_, object_counts_, sizeof(object_counts_));
   memcpy(object_sizes_last_time_, object_sizes_, sizeof(object_sizes_));
   ClearObjectStats();
 }
 
 } }  // namespace v8::internal