| // 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 |