Hi Nicolas,

Thanks for telling me about this. It seems that only ceInstantiateClassIndexableSizeTrampoline and ceByteSizeOfTrampoline needed that kind of correction.

During this month I will try to make Lowcode working with x86_64. I need it working in 64 bits OS X for using Metal with Woden 2, so for me this very important.

Best regards Ronie

2016-11-27 18:50 GMT-03:00 Nicolas Cellier < nicolas.cellier.aka.nice@gmail.com>:

Hi Ronie, From my understanding, following code cannot work in x64 because registers are overwritten while marshalling arguments:

generateLowcodeObjectTrampolines ... snip ... ceInstantiateClassIndexableSizeTrampoline := cogit genTrampolineFor: #instantiateClass:indexableSize: called: ' ceInstantiateClassIndexableSizeTrampoline' arg: ReceiverResultReg arg: Arg0Reg result: TempReg.

The first arg ReceiverResultReg (RDX) will overwrite Arg0Reg (RDI) before Arg0Reg is copied to Arg1Reg (RSI)... See genMarshallNArgs:arg:arg:arg:arg: and carefully read the comment for the x64 flavour, it's scary ;)

Cheers