File:  [gforth] / gforth / debugs.fs
Revision 1.19: download - view: text, annotated - select for diffs
Tue Feb 17 20:49:49 2009 UTC (10 years, 7 months ago) by anton
Branches: MAIN
CVS tags: HEAD
added DEBUG-FID for specifying the output file for ~~ (not yet documented

    1: \ Simple debugging aids
    2: 
    3: \ Copyright (C) 1995,1997,1999,2002,2003,2004,2005,2006,2007 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 3
   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, see http://www.gnu.org/licenses/.
   19: 
   20: 
   21: \ They are meant to support a different style of debugging than the
   22: \ tracing/stepping debuggers used in languages with long turn-around
   23: \ times.
   24: 
   25: \ IMO, a much better (faster) way in fast-compilig languages is to add
   26: \ printing code at well-selected places, let the program run, look at
   27: \ the output, see where things went wrong, add more printing code, etc.,
   28: \ until the bug is found.
   29: 
   30: \ We support fast insertion and removal of the printing code.
   31: 
   32: \ !!Warning: the default debugging actions will destroy the contents
   33: \ of the pictured numeric output string (i.e., don't use ~~ between <#
   34: \ and #>).
   35: 
   36: require source.fs
   37: 
   38: defer printdebugdata ( -- ) \ gforth print-debug-data
   39: ' .s IS printdebugdata
   40: defer .debugline ( nfile nline -- ) \ gforth print-debug-line
   41: \G Print the source code location indicated by @var{nfile nline}, and
   42: \G additional debugging information; the default @code{.debugline}
   43: \G prints the additional information with @code{printdebugdata}.
   44: 
   45: : (.debugline) ( nfile nline -- )
   46:     cr .sourcepos ." :"
   47:     \ it would be nice to print the name of the following word,
   48:     \ but that's not easily possible for primitives
   49:     printdebugdata
   50:     cr ;
   51: 
   52: stderr value debug-fid
   53: \ file-id to output debugging stuff to
   54: 
   55: ' (.debugline) IS .debugline
   56: 
   57: : .debugline-directed ( nfile nline -- )
   58:     ['] .debugline debug-fid outfile-execute ;
   59: 
   60: :noname ( -- )
   61:     current-sourcepos .debugline-directed ;
   62: :noname ( compilation  -- ; run-time  -- )
   63:     compile-sourcepos POSTPONE .debugline-directed ;
   64: interpret/compile: ~~ ( -- ) \ gforth tilde-tilde
   65: \G Prints the source code location of the @code{~~} and the stack
   66: \G contents with @code{.debugline}.
   67: 

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