1: \ assertions
2:
3: \ Copyright (C) 1995,1996,1997,1999,2002,2003,2007,2010 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:
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