Write buffer based write barrier for IA32 and Crankshaft. Currently...

src/runtime.cc

 // Copyright 2010 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 5382 matching lines @@
     double value = HeapNumber::cast(obj)->value();
     int int_value = FastD2I(value);
     if (value == FastI2D(int_value) && Smi::IsValid(int_value)) {
       return Smi::FromInt(int_value);
     }
   }
   return Heap::nan_value();
 }
 
 
+static MaybeObject* Runtime_WriteBufferOverflow(Arguments args) {
+  WriteBuffer::Compact();
+  return Heap::undefined_value();
+}
+
+
 static MaybeObject* Runtime_AllocateHeapNumber(Arguments args) {
   NoHandleAllocation ha;
   ASSERT(args.length() == 0);
   return Heap::AllocateHeapNumber(0);
 }
 
 
 static MaybeObject* Runtime_NumberAdd(Arguments args) {
   NoHandleAllocation ha;
   ASSERT(args.length() == 2);
@@ skipping 5383 matching lines @@
   } else {
     // Handle last resort GC and make sure to allow future allocations
     // to grow the heap without causing GCs (if possible).
     Counters::gc_last_resort_from_js.Increment();
     Heap::CollectAllGarbage(false);
   }
 }
 
 
 } }  // namespace v8::internal