Annotation of gforth/debugs.fs, revision 1.4

1.1       anton       1: \ Simple debugging aids
                      2: 
1.3       anton       3: \ Copyright (C) 1995,1997 Free Software Foundation, Inc.
1.1       anton       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., 675 Mass Ave, Cambridge, MA 02139, 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: 
1.4     ! crook      39: defer printdebugdata ( -- ) \ gforth print-debug-data
1.1       anton      40: ' .s IS printdebugdata
1.4     ! crook      41: defer printdebugline ( addr -- ) \ gforth print-debug-line
1.1       anton      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
1.2       anton      54:     r> sourcepos %size + >r ;
1.1       anton      55: 
                     56: : ~~ ( compilation  -- ; run-time  -- ) \ gforth tilde-tilde
                     57:     POSTPONE (~~) sourcepos, ; immediate
                     58: 

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