1 | /* Test that setjmp/longjmp do not save and restore floating-point |
2 | exceptions and rounding modes. |
3 | Copyright (C) 2013-2022 Free Software Foundation, Inc. |
4 | This file is part of the GNU C Library. |
5 | |
6 | The GNU C Library is free software; you can redistribute it and/or |
7 | modify it under the terms of the GNU Lesser General Public |
8 | License as published by the Free Software Foundation; either |
9 | version 2.1 of the License, or (at your option) any later version. |
10 | |
11 | The GNU C Library is distributed in the hope that it will be useful, |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
14 | Lesser General Public License for more details. |
15 | |
16 | You should have received a copy of the GNU Lesser General Public |
17 | License along with the GNU C Library; if not, see |
18 | <https://www.gnu.org/licenses/>. */ |
19 | |
20 | #include <fenv.h> |
21 | #include <setjmp.h> |
22 | #include <stdio.h> |
23 | #include <stdlib.h> |
24 | |
25 | static jmp_buf __attribute__ ((unused)) env; |
26 | static int result = 0; |
27 | |
28 | #if defined FE_TONEAREST && defined FE_TOWARDZERO |
29 | static int expected_rounding_mode = FE_TONEAREST; |
30 | |
31 | static void |
32 | change_rounding_mode (void) |
33 | { |
34 | if (fesetround (FE_TOWARDZERO) == 0) |
35 | expected_rounding_mode = FE_TOWARDZERO; |
36 | else |
37 | puts (s: "fesetround (FE_TOWARDZERO) failed, continuing test" ); |
38 | longjmp (env: env, val: 1); |
39 | } |
40 | #endif |
41 | |
42 | #ifdef FE_INVALID |
43 | static int expected_exceptions = 0; |
44 | |
45 | static void |
46 | raise_exception (void) |
47 | { |
48 | if (feraiseexcept (FE_INVALID) == 0) |
49 | expected_exceptions = FE_INVALID; |
50 | else |
51 | puts (s: "feraiseexcept (FE_INVALID) failed, continuing test" ); |
52 | longjmp (env: env, val: 1); |
53 | } |
54 | #endif |
55 | |
56 | static int |
57 | do_test (void) |
58 | { |
59 | #if defined FE_TONEAREST && defined FE_TOWARDZERO |
60 | if (fesetround (FE_TONEAREST) == 0) |
61 | { |
62 | if (setjmp (env) == 0) |
63 | change_rounding_mode (); |
64 | else |
65 | { |
66 | if (fegetround () == expected_rounding_mode) |
67 | puts (s: "PASS: longjmp preserved rounding mode" ); |
68 | else |
69 | { |
70 | puts (s: "FAIL: longjmp changed rounding mode" ); |
71 | result = 1; |
72 | } |
73 | } |
74 | } |
75 | else |
76 | puts (s: "fesetround (FE_TONEAREST) failed, not testing rounding modes" ); |
77 | #else |
78 | puts ("rounding mode test not supported" ); |
79 | #endif |
80 | #ifdef FE_INVALID |
81 | if (feclearexcept (FE_ALL_EXCEPT) == 0) |
82 | { |
83 | if (setjmp (env) == 0) |
84 | raise_exception (); |
85 | else |
86 | { |
87 | if (fetestexcept (FE_INVALID) == expected_exceptions) |
88 | puts (s: "PASS: longjmp preserved exceptions" ); |
89 | else |
90 | { |
91 | puts (s: "FAIL: longjmp changed exceptions" ); |
92 | result = 1; |
93 | } |
94 | } |
95 | } |
96 | else |
97 | puts (s: "feclearexcept (FE_ALL_EXCEPT) failed, not testing exceptions" ); |
98 | #else |
99 | puts ("exception test not supported" ); |
100 | #endif |
101 | return result; |
102 | } |
103 | |
104 | #define TEST_FUNCTION do_test () |
105 | #include "../test-skeleton.c" |
106 | |