98 lines
3.1 KiB
C++
98 lines
3.1 KiB
C++
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// Copyright 2018 The Abseil Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "absl/base/internal/atomic_hook.h"
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#include "gmock/gmock.h"
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#include "gtest/gtest.h"
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#include "absl/base/attributes.h"
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#include "absl/base/internal/atomic_hook_test_helper.h"
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namespace {
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using ::testing::Eq;
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int value = 0;
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void TestHook(int x) { value = x; }
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TEST(AtomicHookTest, NoDefaultFunction) {
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ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES static absl::base_internal::AtomicHook<
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void (*)(int)>
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hook;
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value = 0;
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// Test the default DummyFunction.
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EXPECT_TRUE(hook.Load() == nullptr);
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EXPECT_EQ(value, 0);
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hook(1);
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EXPECT_EQ(value, 0);
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// Test a stored hook.
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hook.Store(TestHook);
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EXPECT_TRUE(hook.Load() == TestHook);
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EXPECT_EQ(value, 0);
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hook(1);
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EXPECT_EQ(value, 1);
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// Calling Store() with the same hook should not crash.
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hook.Store(TestHook);
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EXPECT_TRUE(hook.Load() == TestHook);
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EXPECT_EQ(value, 1);
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hook(2);
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EXPECT_EQ(value, 2);
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}
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TEST(AtomicHookTest, WithDefaultFunction) {
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// Set the default value to TestHook at compile-time.
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ABSL_INTERNAL_ATOMIC_HOOK_ATTRIBUTES static absl::base_internal::AtomicHook<
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void (*)(int)>
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hook(TestHook);
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value = 0;
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// Test the default value is TestHook.
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EXPECT_TRUE(hook.Load() == TestHook);
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EXPECT_EQ(value, 0);
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hook(1);
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EXPECT_EQ(value, 1);
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// Calling Store() with the same hook should not crash.
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hook.Store(TestHook);
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EXPECT_TRUE(hook.Load() == TestHook);
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EXPECT_EQ(value, 1);
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hook(2);
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EXPECT_EQ(value, 2);
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}
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ABSL_CONST_INIT int override_func_calls = 0;
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void OverrideFunc() { override_func_calls++; }
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static struct OverrideInstaller {
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OverrideInstaller() { absl::atomic_hook_internal::func.Store(OverrideFunc); }
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} override_installer;
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TEST(AtomicHookTest, DynamicInitFromAnotherTU) {
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// MSVC 14.2 doesn't do constexpr static init correctly; in particular it
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// tends to sequence static init (i.e. defaults) of `AtomicHook` objects
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// after their dynamic init (i.e. overrides), overwriting whatever value was
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// written during dynamic init. This regression test validates the fix.
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// https://developercommunity.visualstudio.com/content/problem/336946/class-with-constexpr-constructor-not-using-static.html
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EXPECT_THAT(absl::atomic_hook_internal::default_func_calls, Eq(0));
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EXPECT_THAT(override_func_calls, Eq(0));
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absl::atomic_hook_internal::func();
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EXPECT_THAT(absl::atomic_hook_internal::default_func_calls, Eq(0));
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EXPECT_THAT(override_func_calls, Eq(1));
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EXPECT_THAT(absl::atomic_hook_internal::func.Load(), Eq(OverrideFunc));
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}
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} // namespace
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