- Add a size field to the header.

vm/assembler_macros_ia32.cc

Index: vm/assembler_macros_ia32.cc
===================================================================
--- vm/assembler_macros_ia32.cc	(revision 2918)
+++ vm/assembler_macros_ia32.cc	(working copy)
@@ -47,6 +47,8 @@
     __ StoreIntoObject(instance_reg,
                        FieldAddress(instance_reg, Instance::class_offset()),
                        class_reg);

[siva, 2012/01/04 01:56:03]

ASSERT(instance_size <= RawObject::SizeTag::kMaxSizeTag);

[Ivan Posva, 2012/01/04 07:59:42]

This assertion would be wrong. RawObject::SizeTag::encode does the right thing
when instance_size is larger than RawObject::SizeTag::kMaxSizeTag. It sets the
tag to 0.

+    __ movl(FieldAddress(instance_reg, Object::tags_offset()),
+            Immediate(RawObject::SizeTag::encode(instance_size)));
   } else {
     __ jmp(failure);
   }