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// Copyright 2021 The Abseil Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "absl/strings/internal/cord_internal.h"
#include "gmock/gmock.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace cord_internal {
TEST(RefcountAndFlags, NormalRefcount) {
for (bool expect_high_refcount : {false, true}) {
SCOPED_TRACE(expect_high_refcount);
RefcountAndFlags refcount;
// count = 1
EXPECT_FALSE(refcount.HasCrc());
EXPECT_TRUE(refcount.IsMutable());
EXPECT_TRUE(refcount.IsOne());
refcount.Increment();
// count = 2
EXPECT_FALSE(refcount.HasCrc());
EXPECT_FALSE(refcount.IsMutable());
EXPECT_FALSE(refcount.IsOne());
// Decrementing should return true, since a reference is outstanding.
if (expect_high_refcount) {
EXPECT_TRUE(refcount.DecrementExpectHighRefcount());
} else {
EXPECT_TRUE(refcount.Decrement());
}
// count = 1
EXPECT_FALSE(refcount.HasCrc());
EXPECT_TRUE(refcount.IsMutable());
EXPECT_TRUE(refcount.IsOne());
// One more decremnt will return false, as no references remain.
if (expect_high_refcount) {
EXPECT_FALSE(refcount.DecrementExpectHighRefcount());
} else {
EXPECT_FALSE(refcount.Decrement());
}
}
}
TEST(RefcountAndFlags, CrcRefcount) {
for (bool expect_high_refcount : {false, true}) {
SCOPED_TRACE(expect_high_refcount);
RefcountAndFlags refcount(RefcountAndFlags::WithCrc{});
// count = 1
// A CRC-carrying node is never mutable, but can be unshared
EXPECT_TRUE(refcount.HasCrc());
EXPECT_FALSE(refcount.IsMutable());
EXPECT_TRUE(refcount.IsOne());
refcount.Increment();
// count = 2
EXPECT_TRUE(refcount.HasCrc());
EXPECT_FALSE(refcount.IsMutable());
EXPECT_FALSE(refcount.IsOne());
// Decrementing should return true, since a reference is outstanding.
if (expect_high_refcount) {
EXPECT_TRUE(refcount.DecrementExpectHighRefcount());
} else {
EXPECT_TRUE(refcount.Decrement());
}
// count = 1
EXPECT_TRUE(refcount.HasCrc());
EXPECT_FALSE(refcount.IsMutable());
EXPECT_TRUE(refcount.IsOne());
// One more decremnt will return false, as no references remain.
if (expect_high_refcount) {
EXPECT_FALSE(refcount.DecrementExpectHighRefcount());
} else {
EXPECT_FALSE(refcount.Decrement());
}
}
}
TEST(RefcountAndFlags, ImmortalRefcount) {
RefcountAndFlags immortal_refcount(RefcountAndFlags::Immortal{});
for (int i = 0; i < 100; ++i) {
// An immortal refcount is never unshared, and decrementing never causes
// a collection.
EXPECT_FALSE(immortal_refcount.HasCrc());
EXPECT_FALSE(immortal_refcount.IsMutable());
EXPECT_FALSE(immortal_refcount.IsOne());
EXPECT_TRUE(immortal_refcount.Decrement());
EXPECT_TRUE(immortal_refcount.DecrementExpectHighRefcount());
}
}
} // namespace cord_internal
ABSL_NAMESPACE_END
} // namespace absl
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