Annotation of gforth/debugs.fs, revision 1.1

1.1     ! anton       1: \ Simple debugging aids
        !             2: 
        !             3: \ Copyright (C) 1995 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., 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: 
        !            39: defer printdebugdata ( -- ) \ gforth
        !            40: ' .s IS printdebugdata
        !            41: defer printdebugline ( addr -- ) \ gforth
        !            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 drop + >r ;
        !            55: 
        !            56: : ~~ ( compilation  -- ; run-time  -- ) \ gforth tilde-tilde
        !            57:     POSTPONE (~~) sourcepos, ; immediate
        !            58: 

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