[heap] Add optimized RecordWrites

src/objects-inl.h

 // 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.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 1130 matching lines @@
 #define NOBARRIER_WRITE_FIELD(p, offset, value)                   \
   base::NoBarrier_Store(                                          \
       reinterpret_cast<base::AtomicWord*>(FIELD_ADDR(p, offset)), \
       reinterpret_cast<base::AtomicWord>(value));
 
 #define WRITE_BARRIER(heap, object, offset, value)          \
   heap->incremental_marking()->RecordWrite(                 \
       object, HeapObject::RawField(object, offset), value); \
   heap->RecordWrite(object, offset, value);
 
+#define FIXED_ARRAY_WRITE_BARRIER(heap, array, start, length) \

[Hannes Payer (out of office), 2016/04/01 11:34:40]

FIXED_ARRAY_ELEMENTS_WRITE_BARRIER

[Camillo Bruni, 2016/04/01 13:45:02]

done.

+  heap->RecordWrites(array, start, length);                   \

[ulan, 2016/04/01 11:28:32]

Let's put the two statements in

do {

} while (false)

so that they do not get separated at macro usage site.

[Camillo Bruni, 2016/04/01 13:45:02]

done.

+  heap->incremental_marking()->IterateBlackObject(array)
+
 #define CONDITIONAL_WRITE_BARRIER(heap, object, offset, value, mode) \
   if (mode != SKIP_WRITE_BARRIER) {                                  \
     if (mode == UPDATE_WRITE_BARRIER) {                              \
       heap->incremental_marking()->RecordWrite(                      \
           object, HeapObject::RawField(object, offset), value);      \
     }                                                                \
     heap->RecordWrite(object, offset, value);                        \
   }
 
 #define READ_DOUBLE_FIELD(p, offset) \
@@ skipping 6663 matching lines @@
 #undef WRITE_INT64_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_OBJECTS_INL_H_