Do not mark from native code. Check color and call incremental marker instead.

src/arm64/macro-assembler-arm64.h

Index: src/arm64/macro-assembler-arm64.h
diff --git a/src/arm64/macro-assembler-arm64.h b/src/arm64/macro-assembler-arm64.h
index 8a40142c40e90555a201bb85042c69e5600b3a52..27772665d028196337a70a1cf51f6a6bd2b56fcb 100644
--- a/src/arm64/macro-assembler-arm64.h
+++ b/src/arm64/macro-assembler-arm64.h
@@ -1799,23 +1799,11 @@ class MacroAssembler : public Assembler {
       PointersToHereCheck pointers_to_here_check_for_value =
           kPointersToHereMaybeInteresting);
 
-  // Checks the color of an object. If the object is already grey or black
-  // then we just fall through, since it is already live. If it is white and
-  // we can determine that it doesn't need to be scanned, then we just mark it
-  // black and fall through. For the rest we jump to the label so the
-  // incremental marker can fix its assumptions.
-  void EnsureNotWhite(Register object,
-                      Register scratch1,
-                      Register scratch2,
-                      Register scratch3,
-                      Register scratch4,
-                      Label* object_is_white_and_not_data);
-
-  // Detects conservatively whether an object is data-only, i.e. it does need to
-  // be scanned by the garbage collector.
-  void JumpIfDataObject(Register value,
-                        Register scratch,
-                        Label* not_data_object);
+  // Checks the color of an object.  If the object is white we jump to the
+  // incremental marker.
+  void CheckIfWhite(Register object, Register scratch1, Register scratch2,
+                    Register scratch3, Register scratch4,
+                    Label* object_is_white);

[ulan, 2015/12/23 11:02:20]

should be value_is_white for consistency with .cc

[Hannes Payer (out of office), 2015/12/23 12:14:05]

Done.

 
   // Helper for finding the mark bits for an address.
   // Note that the behaviour slightly differs from other architectures.