File:  [gforth] / gforth / assert.fs
Revision 1.19: download - view: text, annotated - select for diffs
Mon Dec 31 15:25:17 2012 UTC (6 years, 7 months ago) by anton
Branches: MAIN
CVS tags: HEAD
updated copyright year

    1: \ assertions
    2: 
    3: \ Copyright (C) 1995,1996,1997,1999,2002,2003,2007,2010,2012 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: require source.fs
   21: 
   22: variable assert-level ( -- a-addr ) \ gforth
   23: \G All assertions above this level are turned off.
   24: 1 assert-level !
   25: 
   26: : (end-assert) ( flag nfile nline -- ) \ gforth-internal
   27:     rot if
   28: 	2drop
   29:     else
   30: 	.sourcepos ." : failed assertion"
   31: 	true abort" assertion failed" \ !! or use a new throw code?
   32:     then ;
   33: 
   34: : assert) ( -- )
   35:     compile-sourcepos POSTPONE (end-assert) ;
   36: 
   37: 6 Constant assert-canary
   38: 
   39: : assertn ( n -- ) \ gforth assert-n
   40:     \ this is internal (it is not immediate)
   41:     assert-level @ >
   42:     if
   43: 	POSTPONE (
   44:     else
   45: 	['] assert) assert-canary
   46:     then ;
   47: 
   48: : )  ( -- ) \ gforth	close-paren
   49:     \G End an assertion. Generic end, can be used for other similar purposes
   50:     assert-canary <> abort" unmatched assertion"
   51:     execute ; immediate
   52: 
   53: : assert0( ( -- ) \ gforth assert-zero
   54:     \G Important assertions that should always be turned on.
   55:     0 assertn ; immediate compile-only
   56: : assert1( ( -- ) \ gforth assert-one
   57:     \G Normal assertions; turned on by default.
   58:     1 assertn ; immediate compile-only
   59: : assert2( ( -- ) \ gforth assert-two
   60:     \G Debugging assertions.
   61:     2 assertn ; immediate compile-only
   62: : assert3( ( -- ) \ gforth assert-three
   63:     \G Slow assertions that you may not want to turn on in normal debugging;
   64:     \G you would turn them on mainly for thorough checking.
   65:     3 assertn ; immediate compile-only
   66: : assert( ( -- ) \ gforth
   67:     \G Equivalent to @code{assert1(}
   68:     POSTPONE assert1( ; immediate compile-only
   69: 

FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>