6 The DBG Package

print-catch-frames

Variable

Summary

Controls whether catch frames are printed in debugger output.

Package

dbg

Initial Value

t

Description

This variable is used by the debugger when it displays the stack frames. Catch frames are created when the special formcatch is used. They are set up so that throws to the matching tag can be received. By default the debugger displays these frames, but if*print-catch-frames* is set tonil then the catch frames are no longer shown.

Examples

USER 17 > (setq dbg:*print-catch-frames* nil)

NIL 
USER 18 > (defun catch-it ()
   (catch 'tag (throw-it) (print "Not caught")))

CATCH-IT 
USER 19 > (defun throw-it ()
              (throw 'tag (break)))

THROW-IT 
USER 20 > (catch-it)

break
   1 (continue) return from break.
   2 (abort) return to top loop level 0.

Type :c followed by a number to proceed

USER 21 : 1 > :b 5 
Interpreted call to (DEFUN THROW-IT): 
Call to *%APPLY-INTERPRETED-FUNCTION  : 
Interpreted call to (DEFUN CATCH-IT): 
Call to *%APPLY-INTERPRETED-FUNCTION  : 
Call to %EVAL  :

Notes
: *print-catch-frames* is an extension to Common Lisp.