File:  [gforth] / gforth / debugs.fs
Revision 1.6: download - view: text, annotated - select for diffs
Sat Sep 23 15:46:52 2000 UTC (18 years, 11 months ago) by anton
Branches: MAIN
CVS tags: v0-5-0, HEAD
changed FSF address in copyright messages

    1: \ Simple debugging aids
    2: 
    3: \ Copyright (C) 1995,1997,1999 Free Software Foundation, Inc.
    4: 
    5: \ This file is part of Gforth.
    6: 
    7: \ Gforth is free software; you can redistribute it and/or
    8: \ modify it under the terms of the GNU General Public License
    9: \ as published by the Free Software Foundation; either version 2
   10: \ of the License, or (at your option) any later version.
   11: 
   12: \ This program is distributed in the hope that it will be useful,
   13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
   14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   15: \ GNU General Public License for more details.
   16: 
   17: \ You should have received a copy of the GNU General Public License
   18: \ along with this program; if not, write to the Free Software
   19: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
   20: 
   21: 
   22: \ They are meant to support a different style of debugging than the
   23: \ tracing/stepping debuggers used in languages with long turn-around
   24: \ times.
   25: 
   26: \ IMO, a much better (faster) way in fast-compilig languages is to add
   27: \ printing code at well-selected places, let the program run, look at
   28: \ the output, see where things went wrong, add more printing code, etc.,
   29: \ until the bug is found.
   30: 
   31: \ We support fast insertion and removal of the printing code.
   32: 
   33: \ !!Warning: the default debugging actions will destroy the contents
   34: \ of the pictured numeric output string (i.e., don't use ~~ between <#
   35: \ and #>).
   36: 
   37: require source.fs
   38: 
   39: defer printdebugdata ( -- ) \ gforth print-debug-data
   40: ' .s IS printdebugdata
   41: defer printdebugline ( addr -- ) \ gforth print-debug-line
   42: 
   43: : (printdebugline) ( addr -- )
   44:     cr print-sourcepos ." :"
   45:     \ it would be nice to print the name of the following word,
   46:     \ but that's not easily possible for primitives
   47:     printdebugdata
   48:     cr ;
   49: 
   50: ' (printdebugline) IS printdebugline
   51: 
   52: : (~~) ( -- )
   53:     r@ printdebugline
   54:     r> sourcepos %size + >r ;
   55: 
   56: : ~~ ( compilation  -- ; run-time  -- ) \ gforth tilde-tilde
   57:     POSTPONE (~~) sourcepos, ; immediate
   58: 

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