MMTk gurus! I'm working on MMTk 'unboxed' package support in DRLVM. I hope I finished the implementation, but because of the scant comments in JAVA docs (like http://jikesrvm.sourceforge.net/api/org/vmmagic/unboxed/Offset.html) I feel that I do not completely understand the semantics of some operations.
Here is one of the issues I do not completely understand: Look into this test: long v1 = Offset.fromIntSignExtend(0xBABA).toLong() long v2 =Offset.fromIntSignExtend(0xffffffff).toLong() What result is expected after these transformations on IA32 platform? The Offset by itself is an Integer of 32 or 64 bits (BTW is it signed?). If the offset is 32 bit integer on IA32 platform the operations like fromIntSignExtend or fromIntZeroExtend do nothing and just return the integer value of the offset. So, after the operations above v1=0xBABA and v2=0xFFffFFff for IA32 and v1=0xBABA and v2=0xFFffFFffFFffFFff for EM64T platforms. Is it right? -- Mikhail Fursov