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, 21 insertions, 4 deletions

diff --git a/absl/strings/cordz_test_helpers.h b/absl/strings/cordz_test_helpers.h
index d9573c97..e410eecf 100644
--- a/absl/strings/cordz_test_helpers.h
+++ b/absl/strings/cordz_test_helpers.h
@@ -27,6 +27,7 @@
 #include "absl/strings/internal/cordz_sample_token.h"
 #include "absl/strings/internal/cordz_statistics.h"
 #include "absl/strings/internal/cordz_update_tracker.h"
+#include "absl/strings/str_cat.h"
 
 namespace absl {
 ABSL_NAMESPACE_BEGIN
@@ -34,7 +35,7 @@ ABSL_NAMESPACE_BEGIN
 // Returns the CordzInfo for the cord, or nullptr if the cord is not sampled.
 inline const cord_internal::CordzInfo* GetCordzInfoForTesting(
     const Cord& cord) {
-  if (cord.size() <= cord_internal::kMaxInline) return nullptr;
+  if (!cord.contents_.is_tree()) return nullptr;
   return cord.contents_.cordz_info();
 }
 
@@ -47,13 +48,11 @@ inline bool CordzInfoIsListed(const cord_internal::CordzInfo* cordz_info,
   return false;
 }
 
-// Matcher on Cord* that verifies all of:
+// Matcher on Cord that verifies all of:
 // - the cord is sampled
 // - the CordzInfo of the cord is listed / discoverable.
 // - the reported CordzStatistics match the cord's actual properties
 // - the cord has an (initial) UpdateTracker count of 1 for `method`
-// This matcher accepts a const Cord* to avoid having the matcher dump
-// copious amounts of cord data on failures.
 MATCHER_P(HasValidCordzInfoOf, method, "CordzInfo matches cord") {
   const cord_internal::CordzInfo* cord_info = GetCordzInfoForTesting(arg);
   if (cord_info == nullptr) {
@@ -78,6 +77,24 @@ MATCHER_P(HasValidCordzInfoOf, method, "CordzInfo matches cord") {
   return true;
 }
 
+// Matcher on Cord that verifies that the cord is sampled and that the CordzInfo
+// update tracker has 'method' with a call count of 'n'
+MATCHER_P2(CordzMethodCountEq, method, n,
+           absl::StrCat("CordzInfo method count equals ", n)) {
+  const cord_internal::CordzInfo* cord_info = GetCordzInfoForTesting(arg);
+  if (cord_info == nullptr) {
+    *result_listener << "cord is not sampled";
+    return false;
+  }
+  cord_internal::CordzStatistics stat = cord_info->GetCordzStatistics();
+  if (stat.update_tracker.Value(method) != n) {
+    *result_listener << "Expected method count " << n << " for " << method
+                     << ", found " << stat.update_tracker.Value(method);
+    return false;
+  }
+  return true;
+}
+
 // Cordz will only update with a new rate once the previously scheduled event
 // has fired. When we disable Cordz, a long delay takes place where we won't
 // consider profiling new Cords. CordzSampleIntervalHelper will burn through