libc/test/src/fenv/getenv_and_setenv_test.cpp

//===-- Unittests for fegetenv and fesetenv -------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//

#undef LIBC_MATH_USE_SYSTEM_FENV

#include "hdr/types/fenv_t.h"
#include "src/fenv/fegetenv.h"
#include "src/fenv/fegetround.h"
#include "src/fenv/fesetenv.h"
#include "src/fenv/fesetround.h"

#include "src/__support/FPUtil/FEnvImpl.h"
#include "src/__support/macros/properties/os.h"
#include "test/UnitTest/FEnvSafeTest.h"
#include "test/UnitTest/Test.h"

#include "excepts.h"

using LlvmLibcFEnvTest = LIBC_NAMESPACE::testing::FEnvSafeTest;

TEST_F(LlvmLibcFEnvTest, GetEnvAndSetEnv) {
  // We will disable all exceptions to prevent invocation of the exception
  // handler.
  LIBC_NAMESPACE::fputil::disable_except(FE_ALL_EXCEPT);

  for (int e : EXCEPTS) {
    LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);

    // Save the cleared environment.
    fenv_t env;
    ASSERT_EQ(LIBC_NAMESPACE::fegetenv(&env), 0);

    LIBC_NAMESPACE::fputil::raise_except(e);
    // Make sure that the exception is raised.
    ASSERT_NE(LIBC_NAMESPACE::fputil::test_except(FE_ALL_EXCEPT) & e, 0);

    ASSERT_EQ(LIBC_NAMESPACE::fesetenv(&env), 0);
    ASSERT_EQ(LIBC_NAMESPACE::fputil::test_except(FE_ALL_EXCEPT) & e, 0);
  }
}

TEST_F(LlvmLibcFEnvTest, Set_FE_DFL_ENV) {
  // We will disable all exceptions to prevent invocation of the exception
  // handler.
  LIBC_NAMESPACE::fputil::disable_except(FE_ALL_EXCEPT);

  int excepts[] = {FE_DIVBYZERO, FE_INVALID, FE_INEXACT, FE_OVERFLOW,
                   FE_UNDERFLOW};

  for (int e : excepts) {
    LIBC_NAMESPACE::fputil::clear_except(FE_ALL_EXCEPT);

    // Save the cleared environment.
    fenv_t env;
    ASSERT_EQ(LIBC_NAMESPACE::fegetenv(&env), 0);

    LIBC_NAMESPACE::fputil::raise_except(e);
    // Make sure that the exception is raised.
    ASSERT_NE(LIBC_NAMESPACE::fputil::test_except(FE_ALL_EXCEPT) & e, 0);

    ASSERT_EQ(LIBC_NAMESPACE::fesetenv(FE_DFL_ENV), 0);
    // Setting the default env should clear all exceptions.
    ASSERT_EQ(LIBC_NAMESPACE::fputil::test_except(FE_ALL_EXCEPT) & e, 0);
  }

  ASSERT_EQ(LIBC_NAMESPACE::fesetround(FE_DOWNWARD), 0);
  ASSERT_EQ(LIBC_NAMESPACE::fesetenv(FE_DFL_ENV), 0);
  // Setting the default env should set rounding mode to FE_TONEAREST.
  int rm = LIBC_NAMESPACE::fegetround();
  EXPECT_EQ(rm, FE_TONEAREST);
}