User-defined invocation data. Useful if you want to read an argument in onEnter and act on it in onLeave.
onEnter
onLeave
CPU registers. You may also update register values by assigning to these keys.
Call depth of relative to other invocations.
Current OS error value (you may replace it).
Return address.
OS thread ID.
User-defined invocation data. Useful if you want to read an argument in
onEnterand act on it inonLeave.