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Re: Single Step Debugging, why or why not?

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anton@mips.complang.tuwien.ac.at (Anton Ertl) writes:
> Disadvantage: You can waste a lot of time for stepping through the
> program and checking at many steps whether the state is still as
> intended.

That is not the way to do it.  Identify something that has gone wrong
(like x has somehow been set to 5 when it should be zero), then set
either a watchpoint on x or a conditional breakpoint on something that
might set x, then run the program til x gets set to 5.  If it's still
not obvious where the bug is, find some other wrong data in the image
and set more conditional breakpoints to see how it got that way.  If
your debugger can run code backwards, that's great.  Otherwise you have
to re-run the code multiple times, but that's not too bad if the bug is
reproduceable.

For intermittent bugs, debuggers are even more valuable, since you set
conditional breakpoints where things can go wrong, and you can examine
and modify the complete contents of memory when the breakpoint is
reached.  The bug may not occur often enough for repeatedly inserting
trace messages (~~) to catch the bug anytime soon.

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Thread

Single Step Debugging,  why or why not? Jason Damisch <jasondamisch@yahoo.com> - 2012-08-30 11:27 -0700
  Re: Single Step Debugging,  why or why not? "Elizabeth D. Rather" <erather@forth.com> - 2012-08-30 08:42 -1000
  Single Step Debugging,  why or why not? Mark Wills <markrobertwills@yahoo.co.uk> - 2012-08-30 14:37 -0700
    Re: Single Step Debugging,  why or why not? "Elizabeth D. Rather" <erather@forth.com> - 2012-08-30 14:26 -1000
      Re: Single Step Debugging, why or why not? Mark Wills <markrobertwills@yahoo.co.uk> - 2012-08-31 02:25 -0700
        Re: Single Step Debugging, why or why not? "Elizabeth D. Rather" <erather@forth.com> - 2012-08-31 08:18 -1000
  Re: Single Step Debugging,  why or why not? Paul Rubin <no.email@nospam.invalid> - 2012-08-30 18:48 -0700
    Re: Single Step Debugging, why or why not? Mark Wills <markrobertwills@yahoo.co.uk> - 2012-08-31 02:12 -0700
  Re: Single Step Debugging,  why or why not? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-08-31 08:54 +0000
    Re: Single Step Debugging,  why or why not? Paul Rubin <no.email@nospam.invalid> - 2012-08-31 02:46 -0700
      Re: Single Step Debugging,  why or why not? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-08-31 05:56 -0500
        Re: Single Step Debugging,  why or why not? Paul Rubin <no.email@nospam.invalid> - 2012-08-31 09:10 -0700
          Re: Single Step Debugging,  why or why not? Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-08-31 11:33 -0500
            Re: Single Step Debugging, why or why not? Mark Wills <markrobertwills@yahoo.co.uk> - 2012-08-31 12:51 -0700
              Re: Single Step Debugging, why or why not? Coos Haak <chforth@hccnet.nl> - 2012-08-31 23:23 +0200
              Re: Single Step Debugging, why or why not? Paul Rubin <no.email@nospam.invalid> - 2012-08-31 15:42 -0700
                Re: Single Step Debugging, why or why not? Bernd Paysan <bernd.paysan@gmx.de> - 2012-09-01 01:52 +0200
                Re: Single Step Debugging, why or why not? Paul Rubin <no.email@nospam.invalid> - 2012-09-01 17:41 -0700
          Re: Single Step Debugging,  why or why not? Gerry Jackson <gerry@jackson9000.fsnet.co.uk> - 2012-08-31 17:54 +0100
          Re: Single Step Debugging,  why or why not? "Elizabeth D. Rather" <erather@forth.com> - 2012-08-31 08:22 -1000
          Re: Single Step Debugging,  why or why not? "Ed" <invalid@nospam.com> - 2012-09-03 22:15 +1000

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