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//===-- Unittests for feholdexcept with exceptions enabled ----------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "src/fenv/feholdexcept.h"
#include "src/__support/FPUtil/FEnvImpl.h"
#include "src/__support/macros/properties/architectures.h"
#include "test/UnitTest/FPExceptMatcher.h"
#include "test/UnitTest/Test.h"
#include <fenv.h>
TEST(LlvmLibcFEnvTest, RaiseAndCrash) {
#if defined(LIBC_TARGET_ARCH_IS_ANY_ARM) || defined(LIBC_TARGET_ARCH_IS_RISCV64)
// Few Arm HW implementations do not trap exceptions. We skip this test
// completely on such HW.
//
// Whether HW supports trapping exceptions or not is deduced by enabling an
// exception and reading back to see if the exception got enabled. If the
// exception did not get enabled, then it means that the HW does not support
// trapping exceptions.
__llvm_libc::fputil::disable_except(FE_ALL_EXCEPT);
__llvm_libc::fputil::enable_except(FE_DIVBYZERO);
if (__llvm_libc::fputil::get_except() == 0)
return;
#endif // Architectures where exception trapping is not supported
int excepts[] = {FE_DIVBYZERO, FE_INVALID, FE_INEXACT, FE_OVERFLOW,
FE_UNDERFLOW};
for (int e : excepts) {
fenv_t env;
__llvm_libc::fputil::disable_except(FE_ALL_EXCEPT);
__llvm_libc::fputil::enable_except(e);
ASSERT_EQ(__llvm_libc::fputil::clear_except(FE_ALL_EXCEPT), 0);
ASSERT_EQ(__llvm_libc::feholdexcept(&env), 0);
// feholdexcept should disable all excepts so raising an exception
// should not crash/invoke the exception handler.
ASSERT_EQ(__llvm_libc::fputil::raise_except(e), 0);
ASSERT_RAISES_FP_EXCEPT([=] {
// When we put back the saved env, which has the exception enabled, it
// should crash with SIGFPE. Note that we set the old environment
// back inside this closure because in some test frameworks like Fuchsia's
// zxtest, this test translates to a death test in which this closure is
// run in a different thread. So, we set the old environment inside
// this closure so that the exception gets enabled for the thread running
// this closure.
__llvm_libc::fputil::set_env(&env);
__llvm_libc::fputil::raise_except(e);
});
// Cleanup
__llvm_libc::fputil::disable_except(FE_ALL_EXCEPT);
ASSERT_EQ(__llvm_libc::fputil::clear_except(FE_ALL_EXCEPT), 0);
}
}
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