File:  [gforth] / gforth / debugs.fs
Revision 1.25: download - view: text, annotated - select for diffs
Thu Aug 9 23:58:52 2012 UTC (7 years ago) by pazsan
Branches: MAIN
CVS tags: HEAD
debug file id generalized, fixed uninitialized xc\!+

    1: \ Simple debugging aids
    2: 
    3: \ Copyright (C) 1995,1997,1999,2002,2003,2004,2005,2006,2007,2009,2011 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: [IFUNDEF] debug-fid
   53: stderr value debug-fid ( -- fid )
   54: \G (value) Debugging output prints to this file
   55: [THEN]
   56: 
   57: ' (.debugline) IS .debugline
   58: 
   59: : .debugline-directed ( nfile nline -- )
   60:     action-of type action-of emit { oldtype oldemit }
   61:     try
   62: 	['] (type) is type ['] (emit) is emit
   63: 	['] .debugline debug-fid outfile-execute
   64: 	0
   65:     restore
   66: 	oldemit is emit oldtype is type
   67:     endtry
   68:     throw ;
   69: 
   70: :noname ( -- )
   71:     current-sourcepos .debugline-directed ;
   72: :noname ( compilation  -- ; run-time  -- )
   73:     compile-sourcepos POSTPONE .debugline-directed ;
   74: interpret/compile: ~~ ( -- ) \ gforth tilde-tilde
   75: \G Prints the source code location of the @code{~~} and the stack
   76: \G contents with @code{.debugline}.
   77: 
   78: :noname ( -- )  stderr to debug-fid  defers 'cold ; IS 'cold

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