zircon/system/utest/compiler/integer.cc

// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <limits>

#include <zxtest/zxtest.h>

namespace {

// Global to prevent "unused variable" compiler error, volatile to make sure
// the compiler doesn't optimize out any operations.
volatile int c = 0;

TEST(IntegerTest, NormalMath) {
  volatile int a = 5;
  volatile int b = 6;
  c = a + b;
  EXPECT_EQ(11, c);
}

TEST(IntegerTest, SignedOverflow) {
  ASSERT_DEATH([] {
    volatile int a = std::numeric_limits<int>::max();
    volatile int b = 6;
    c = a + b;  // crash occurs here
  });
}

TEST(IntegerTest, SignedUnderflow) {
  ASSERT_DEATH([] {
    volatile int a = std::numeric_limits<int>::min();
    volatile int b = -6;
    c = a + b;  // crash occurs here
  });
}

TEST(IntegerTest, DivideByZero) {
  ASSERT_DEATH([] {
    volatile int a = 5;
    volatile int b = 0;
    c = a / b;  // crash occurs here
  });
}

}  // namespace