Annotation of gforth/assert.fs, revision 1.14

1.1       anton       1: \ assertions
                      2: 
1.13      anton       3: \ Copyright (C) 1995,1996,1997,1999,2002,2003 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: 
1.4       anton      26: : assertn ( n -- ) \ gforth assert-n
1.2       anton      27:     \ this is internal (it is not immediate)
1.1       anton      28:     assert-level @ >
                     29:     if
                     30:        POSTPONE (
                     31:     then ;
                     32: 
1.4       anton      33: : assert0( ( -- ) \ gforth assert-zero
1.8       crook      34:     \G Important assertions that should always be turned on.
1.1       anton      35:     0 assertn ; immediate
1.4       anton      36: : assert1( ( -- ) \ gforth assert-one
1.8       crook      37:     \G Normal assertions; turned on by default.
1.1       anton      38:     1 assertn ; immediate
1.4       anton      39: : assert2( ( -- ) \ gforth assert-two
1.8       crook      40:     \G Debugging assertions.
1.1       anton      41:     2 assertn ; immediate
1.4       anton      42: : assert3( ( -- ) \ gforth assert-three
1.8       crook      43:     \G Slow assertions that you may not want to turn on in normal debugging;
                     44:     \G you would turn them on mainly for thorough checking.
1.1       anton      45:     3 assertn ; immediate
1.4       anton      46: : assert( ( -- ) \ gforth
1.8       crook      47:     \G Equivalent to @code{assert1(}
1.1       anton      48:     POSTPONE assert1( ; immediate
                     49: 
1.11      anton      50: : (end-assert) ( flag nfile nline -- ) \ gforth-internal
                     51:     rot if
                     52:        2drop
1.1       anton      53:     else
1.11      anton      54:        .sourcepos ." : failed assertion"
1.1       anton      55:        true abort" assertion failed" \ !! or use a new throw code?
                     56:     then ;
                     57: 
1.4       anton      58: : ) ( -- ) \ gforth    close-paren
1.11      anton      59: \G End an assertion.
                     60:     compile-sourcepos POSTPONE (end-assert) ; immediate

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