Write barrier for storing a code entry, and usage in CompileLazy builtin.

src/heap/incremental-marking.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/heap/incremental-marking.h"
 
 #include "src/code-stubs.h"
 #include "src/compilation-cache.h"
 #include "src/conversions.h"
 #include "src/heap/gc-idle-time-handler.h"
@@ skipping 73 matching lines @@
     marking->write_barriers_invoked_since_last_step_ +=
         MemoryChunk::kWriteBarrierCounterGranularity -
         chunk->write_barrier_counter();
     chunk->set_write_barrier_counter(
         MemoryChunk::kWriteBarrierCounterGranularity);
   }
 
   marking->RecordWrite(obj, slot, *slot);
 }
 
+// static
+void IncrementalMarking::RecordWriteOfCodeEntryFromCode(JSFunction* host,
+                                                        Object** slot,
+                                                        Isolate* isolate) {
+  DCHECK(host->IsJSFunction());
+  IncrementalMarking* marking = isolate->heap()->incremental_marking();
+  Code* value = Code::cast(
+      Code::GetObjectFromEntryAddress(reinterpret_cast<Address>(slot)));
+  marking->RecordWriteOfCodeEntry(host, slot, value);
+}
 
 void IncrementalMarking::RecordCodeTargetPatch(Code* host, Address pc,
                                                HeapObject* value) {
   if (IsMarking()) {
     RelocInfo rinfo(heap_->isolate(), pc, RelocInfo::CODE_TARGET, 0, host);
     RecordWriteIntoCode(host, &rinfo, value);
   }
 }
 
 
@@ skipping 1121 matching lines @@
 void IncrementalMarking::IncrementIdleMarkingDelayCounter() {
   idle_marking_delay_counter_++;
 }
 
 
 void IncrementalMarking::ClearIdleMarkingDelayCounter() {
   idle_marking_delay_counter_ = 0;
 }
 }  // namespace internal
 }  // namespace v8