File:  [gforth] / gforth / assert.fs
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Sat Sep 23 15:05:58 2000 UTC (19 years, 1 month ago) by anton
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CVS tags: HEAD
updated copyright dates in many files (not in ec-related files)

    1: \ assertions
    2: 
    3: \ Copyright (C) 1995,1996,1997,1999 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: require source.fs
   22: 
   23: variable assert-level ( -- a-addr ) \ gforth
   24: \G All assertions above this level are turned off.
   25: 1 assert-level !
   26: 
   27: : assertn ( n -- ) \ gforth assert-n
   28:     \ this is internal (it is not immediate)
   29:     assert-level @ >
   30:     if
   31: 	POSTPONE (
   32:     then ;
   33: 
   34: : assert0( ( -- ) \ gforth assert-zero
   35:     \G Important assertions that should always be turned on.
   36:     0 assertn ; immediate
   37: : assert1( ( -- ) \ gforth assert-one
   38:     \G Normal assertions; turned on by default.
   39:     1 assertn ; immediate
   40: : assert2( ( -- ) \ gforth assert-two
   41:     \G Debugging assertions.
   42:     2 assertn ; immediate
   43: : assert3( ( -- ) \ gforth assert-three
   44:     \G Slow assertions that you may not want to turn on in normal debugging;
   45:     \G you would turn them on mainly for thorough checking.
   46:     3 assertn ; immediate
   47: : assert( ( -- ) \ gforth
   48:     \G Equivalent to @code{assert1(}
   49:     POSTPONE assert1( ; immediate
   50: 
   51: : (endassert) ( flag -- ) \ gforth-internal
   52:     \ inline argument sourcepos
   53:     if
   54: 	r> sourcepos %size + >r EXIT
   55:     else
   56: 	r> print-sourcepos ." : failed assertion"
   57: 	true abort" assertion failed" \ !! or use a new throw code?
   58:     then ;
   59: 
   60: : ) ( -- ) \ gforth	close-paren
   61:     \G End an assertion.
   62:     POSTPONE (endassert) sourcepos, ; immediate

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