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/* Test that setjmp/longjmp do not save and restore floating-point
exceptions and rounding modes.
Copyright (C) 2013-2024 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <fenv.h>
#include <setjmp.h>
#include <stdio.h>
#include <stdlib.h>
static jmp_buf __attribute__ ((unused)) env;
static int result = 0;
#if defined FE_TONEAREST && defined FE_TOWARDZERO
static int expected_rounding_mode = FE_TONEAREST;
static void
change_rounding_mode (void)
{
if (fesetround (FE_TOWARDZERO) == 0)
expected_rounding_mode = FE_TOWARDZERO;
else
puts ("fesetround (FE_TOWARDZERO) failed, continuing test");
longjmp (env, 1);
}
#endif
#ifdef FE_INVALID
static int expected_exceptions = 0;
static void
raise_exception (void)
{
if (feraiseexcept (FE_INVALID) == 0)
expected_exceptions = FE_INVALID;
else
puts ("feraiseexcept (FE_INVALID) failed, continuing test");
longjmp (env, 1);
}
#endif
static int
do_test (void)
{
#if defined FE_TONEAREST && defined FE_TOWARDZERO
if (fesetround (FE_TONEAREST) == 0)
{
if (setjmp (env) == 0)
change_rounding_mode ();
else
{
if (fegetround () == expected_rounding_mode)
puts ("PASS: longjmp preserved rounding mode");
else
{
puts ("FAIL: longjmp changed rounding mode");
result = 1;
}
}
}
else
puts ("fesetround (FE_TONEAREST) failed, not testing rounding modes");
#else
puts ("rounding mode test not supported");
#endif
#ifdef FE_INVALID
if (feclearexcept (FE_ALL_EXCEPT) == 0)
{
if (setjmp (env) == 0)
raise_exception ();
else
{
if (fetestexcept (FE_INVALID) == expected_exceptions)
puts ("PASS: longjmp preserved exceptions");
else
{
puts ("FAIL: longjmp changed exceptions");
result = 1;
}
}
}
else
puts ("feclearexcept (FE_ALL_EXCEPT) failed, not testing exceptions");
#else
puts ("exception test not supported");
#endif
return result;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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