Export of internal Abseil changes

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a78c34c705b15598ea00171d4ff8755e38fad863 by Derek Mauro <dmauro@google.com>:

Improve compiler support for ABSL_FALLTHROUGH_INTENDED

PiperOrigin-RevId: 370952333

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aed0c26f1a2aac98e217ad1b44ce4a858780a223 by Martijn Vels <mvels@google.com>:

Add Cordz instrumentation for Flatten

PiperOrigin-RevId: 370815149

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ff4a58d0109d39dc32ef7a5e5e669ca4e630c6d9 by Martijn Vels <mvels@google.com>:

Add Cordz instrumentation to RemovePrefix and RemoveSuffix

PiperOrigin-RevId: 370751602

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40220a058b30ddd89c6e547591488d15342137dd by Martijn Vels <mvels@google.com>:

Add Cordz instrumentation to operator=(string_view)

PiperOrigin-RevId: 370737600

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a2e49604f18b92e50b179b5477dfddb8f57538ca by Martijn Vels <mvels@google.com>:

Add cordz instrumentation for Subcord

PiperOrigin-RevId: 370724107

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bcc3902e04fb4f14270aef00e18908e6a88474cd by Derek Mauro <dmauro@google.com>:

Internal change

PiperOrigin-RevId: 370707219
GitOrigin-RevId: a78c34c705b15598ea00171d4ff8755e38fad863
Change-Id: I0270e536cbdeaf1f195199da822b314521de3b96

1 files changed, 62 insertions, 0 deletions

diff --git a/absl/strings/cordz_test.cc b/absl/strings/cordz_test.cc
index b16e9686..84947cfd 100644
--- a/absl/strings/cordz_test.cc
+++ b/absl/strings/cordz_test.cc
@@ -52,6 +52,8 @@ inline void PrintTo(const Cord& cord, std::ostream* s) {
 
 namespace {
 
+auto constexpr kMaxInline = cord_internal::kMaxInline;
+
 // Returns a string_view value of the specified length
 // We do this to avoid 'consuming' large strings in Cord by default.
 absl::string_view MakeString(size_t size) {
@@ -139,6 +141,16 @@ TEST(CordzTest, MoveAssignCord) {
   EXPECT_THAT(cord, HasValidCordzInfoOf(Method::kConstructorString));
 }
 
+TEST_P(CordzUpdateTest, AssignSmallArray) {
+  cord() = MakeString(TestCordSize::kSmall);
+  EXPECT_THAT(cord(), HasValidCordzInfoOf(Method::kAssignString));
+}
+
+TEST_P(CordzUpdateTest, AssignInlinedArray) {
+  cord() = MakeString(TestCordSize::kInlined);
+  EXPECT_THAT(GetCordzInfoForTesting(cord()), Eq(nullptr));
+}
+
 TEST_P(CordzUpdateTest, AppendCord) {
   Cord src = UnsampledCord(MakeString(TestCordSize::kLarge));
   cord().Append(src);
@@ -166,6 +178,56 @@ TEST_P(CordzUpdateTest, AppendLargeArray) {
   EXPECT_THAT(cord(), HasValidCordzInfoOf(InitialOr(Method::kAppendString)));
 }
 
+TEST(CordzTest, RemovePrefix) {
+  CordzSamplingIntervalHelper sample_every(1);
+  Cord cord(MakeString(TestCordSize::kLarge));
+
+  // Half the cord
+  cord.RemovePrefix(cord.size() / 2);
+  EXPECT_THAT(cord, HasValidCordzInfoOf(Method::kConstructorString));
+  EXPECT_THAT(cord, CordzMethodCountEq(Method::kRemovePrefix, 1));
+
+  // TODO(mvels): RemovePrefix does not reset to inlined, except if empty?
+  cord.RemovePrefix(cord.size() - kMaxInline);
+  EXPECT_THAT(cord, HasValidCordzInfoOf(Method::kConstructorString));
+  EXPECT_THAT(cord, CordzMethodCountEq(Method::kRemovePrefix, 2));
+
+  cord.RemovePrefix(cord.size());
+  EXPECT_THAT(GetCordzInfoForTesting(cord), Eq(nullptr));
+}
+
+TEST(CordzTest, RemoveSuffix) {
+  CordzSamplingIntervalHelper sample_every(1);
+  Cord cord(MakeString(TestCordSize::kLarge));
+
+  // Half the cord
+  cord.RemoveSuffix(cord.size() / 2);
+  EXPECT_THAT(cord, HasValidCordzInfoOf(Method::kConstructorString));
+  EXPECT_THAT(cord, CordzMethodCountEq(Method::kRemoveSuffix, 1));
+
+  // TODO(mvels): RemoveSuffix does not reset to inlined, except if empty?
+  cord.RemoveSuffix(cord.size() - kMaxInline);
+  EXPECT_THAT(cord, HasValidCordzInfoOf(Method::kConstructorString));
+  EXPECT_THAT(cord, CordzMethodCountEq(Method::kRemoveSuffix, 2));
+
+  cord.RemoveSuffix(cord.size());
+  EXPECT_THAT(GetCordzInfoForTesting(cord), Eq(nullptr));
+}
+
+TEST(CordzTest, SubCord) {
+  CordzSamplingIntervalHelper sample_every{1};
+  Cord src(MakeString(TestCordSize::kLarge));
+
+  Cord cord1 = src.Subcord(10, src.size() / 2);
+  EXPECT_THAT(cord1, HasValidCordzInfoOf(Method::kSubCord));
+
+  Cord cord2 = src.Subcord(10, kMaxInline + 1);
+  EXPECT_THAT(cord2, HasValidCordzInfoOf(Method::kSubCord));
+
+  Cord cord3 = src.Subcord(10, kMaxInline);
+  EXPECT_THAT(GetCordzInfoForTesting(cord3), Eq(nullptr));
+}
+
 }  // namespace
 
 ABSL_NAMESPACE_END