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Annotation of gforth/assert.fs, revision 1.18

1.1       anton       1: \ assertions
                      2: 
1.17      anton       3: \ Copyright (C) 1995,1996,1997,1999,2002,2003,2007,2010 Free Software Foundation, Inc.
1.5       anton       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
1.14      anton       9: \ as published by the Free Software Foundation, either version 3
1.5       anton      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
1.14      anton      18: \ along with this program. If not, see http://www.gnu.org/licenses/.
1.5       anton      19: 
                     20: require source.fs
1.1       anton      21: 
1.4       anton      22: variable assert-level ( -- a-addr ) \ gforth
1.8       crook      23: \G All assertions above this level are turned off.
1.1       anton      24: 1 assert-level !
                     25: 
1.18    ! pazsan     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: 
1.4       anton      39: : assertn ( n -- ) \ gforth assert-n
1.2       anton      40:     \ this is internal (it is not immediate)
1.1       anton      41:     assert-level @ >
                     42:     if
                     43:        POSTPONE (
1.18    ! pazsan     44:     else
        !            45:        ['] assert) assert-canary
1.1       anton      46:     then ;
                     47: 
1.18    ! pazsan     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: 
1.4       anton      53: : assert0( ( -- ) \ gforth assert-zero
1.8       crook      54:     \G Important assertions that should always be turned on.
1.16      anton      55:     0 assertn ; immediate compile-only
1.4       anton      56: : assert1( ( -- ) \ gforth assert-one
1.8       crook      57:     \G Normal assertions; turned on by default.
1.16      anton      58:     1 assertn ; immediate compile-only
1.4       anton      59: : assert2( ( -- ) \ gforth assert-two
1.8       crook      60:     \G Debugging assertions.
1.16      anton      61:     2 assertn ; immediate compile-only
1.4       anton      62: : assert3( ( -- ) \ gforth assert-three
1.8       crook      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.
1.16      anton      65:     3 assertn ; immediate compile-only
1.4       anton      66: : assert( ( -- ) \ gforth
1.8       crook      67:     \G Equivalent to @code{assert1(}
1.16      anton      68:     POSTPONE assert1( ; immediate compile-only
1.1       anton      69: