exception handling macros

Exception creation can be fairly verbose. These macros provide an API of sorts to the exceptions.

catch ()

Preamble for any tcl-related exception handler.

rethrow ()

Re-throw the current exception

get_stacktrace (OUT string message)

RT#40687: return the stacktrace for the current exception

get_message (OUT string message)

Get the simple string message for the current exception.

get_severity (OUT int level)

Get the severity level of the current exception.

get_return_code

Get the tcl-level code for this exception. (TCL_CATCH, TCL_RETURN), etc. Note that TCL_OK is not one of the options here: that's implied by a normal parrot .return

Utility methods

the implementation of these never change: define them once and just include them.

cloneable ()

Simplistic implementation of clone vtable

dumper

Utility macro to simplify generating output during debug cycles.