[Vm-dev] Re: SystemTracing: SystemTracing-dtl.23.mcz

David T. Lewis lewis at mail.msen.com
Thu Dec 8 17:49:15 UTC 2011

This is an update to the system tracer that makes it possible to
trace current Squeak images to 64-bit image format. Prior to this
update, only pre-closure images could be converted to 64-bit object

Thanks to Eliot for the tip that pointed me to the solution, which
is that instances of BlockClosure need to have the value of their
startpc instance variable adjusted to match byte offsets in the
enclosing compiled method when converting from 32-bit to 64-bit
object format.

This works on Squeak, not yet tested on Pharo.


On Thu, Dec 08, 2011 at 05:17:49AM +0000, squeak-dev-noreply at lists.squeakfoundation.org wrote:
> Dave Lewis uploaded a new version of SystemTracing to project SystemTracing:
> http://www.squeaksource.com/SystemTracing/SystemTracing-dtl.23.mcz
> ==================== Summary ====================
> Name: SystemTracing-dtl.23
> Author: dtl
> Time: 7 December 2011, 11:17:47 am
> UUID: 9f6136af-8117-416c-bf54-baf2a32bb571
> Ancestors: SystemTracing-dtl.22
> Support tracing closure-enabled images to 64-bit object format.
> When tracing to a different word size, e.g. trace to 64-bit image from a 32-bit image, adjust the startpc of all BlockClosure instances to account for different word size in the enclosing compiled method.

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