Start using store buffers. Handle store buffer overflow situation....

src/store-buffer-inl.h

 // Copyright 2011 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 33 matching lines @@
   *top++ = addr;
   Heap::public_set_store_buffer_top(top);
   if ((reinterpret_cast<uintptr_t>(top) & kStoreBufferOverflowBit) != 0) {
     ASSERT(top == limit_);
     Compact();
   } else {
     ASSERT(top < limit_);
   }
 }
 
+
+void StoreBuffer::EnterDirectlyIntoStoreBuffer(Address addr) {
+  if (store_buffer_rebuilding_enabled_) {
+    Address* top = old_top_;
+    *top++ = addr;
+    old_top_ = top;
+    if (top >= old_limit_) {
+      Counters::store_buffer_overflows.Increment();
+      store_buffer_mode_ = kStoreBufferDisabled;
+      old_top_ = old_start_;
+    }
+  }
+}
+
+
 } }  // namespace v8::internal
 
 #endif  // V8_WRITE_BARRIER_INL_H_