Generate code for store buffer updates in open-coded object field stores.

runtime/vm/assembler_ia32.h

Index: runtime/vm/assembler_ia32.h
diff --git a/runtime/vm/assembler_ia32.h b/runtime/vm/assembler_ia32.h
index 4b7c87558a7b4b86485dfccc0ea95a68c22cdfb2..c6a7d9a1867259ef3da2cee724dd5b82b399c4e8 100644
--- a/runtime/vm/assembler_ia32.h
+++ b/runtime/vm/assembler_ia32.h
@@ -521,6 +521,13 @@ class Assembler : public ValueObject {
                        const FieldAddress& dest,  // Where we are storing into.
                        Register value);  // Value we are storing.
 
+  void StoreIntoObjectNoBarrier(Register object,

[Ivan Posva, 2012/06/12 13:43:58]

I don't think you need the object for these two stores.

[cshapiro, 2012/06/12 21:41:01]

If you are suggesting that a minimal implementation does not need the parameter,
I do understand that.  But, there is more going on here than just a field
assignment.

The object argument is used by the implementation of this method.  This is used
to validate the safety of the store in debug mode.  Also, for this method, and
the method below, I need the object for implementing tracing of assignments to
heap objects.

+                                const FieldAddress& dest,
+                                Register value);
+  void StoreIntoObjectNoBarrier(Register object,
+                                const FieldAddress& dest,
+                                const Immediate& value);
+
   void DoubleNegate(XmmRegister d);
   void FloatNegate(XmmRegister f);