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Diffstat (limited to 'absl/strings/internal/cord_internal_test.cc')
-rw-r--r-- | absl/strings/internal/cord_internal_test.cc | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/absl/strings/internal/cord_internal_test.cc b/absl/strings/internal/cord_internal_test.cc new file mode 100644 index 00000000..0758dfef --- /dev/null +++ b/absl/strings/internal/cord_internal_test.cc @@ -0,0 +1,116 @@ +// 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 |