Export of internal Abseil changes.

--
eca34da4ccb7bb6a580f1364dff9ca053418fa3b by Abseil Team <absl-team@google.com>:

Internal change.

PiperOrigin-RevId: 214305433

--
35393bdd21a87c4286f945fd34dda93afc4e0cd6 by Abseil Team <absl-team@google.com>:

Move some implementation details of string_view around to facilitate compiling on NVCC.

Abseil does not officially support NVCC as a reminder.

PiperOrigin-RevId: 214184876

--
61846cab9ab9476a4676ecade7173f68978cd038 by Jorg Brown <jorg@google.com>:

Move the initialization values for constants back to their declaration.

PiperOrigin-RevId: 214135927

--
7ac7df6c5f78f2faf419268c04618b936cb26065 by Abseil Team <absl-team@google.com>:

Performance improvements on format parser.

PiperOrigin-RevId: 214032366

--
90b4c0cf20e9feaa257a7ece40adaf7db40a60a7 by Xiaoyi Zhang <zhangxy@google.com>:

Add static_assert check to absl::visit to make sure all overloads of the visitor return the same type, as required by the C++ standard.

PiperOrigin-RevId: 213677001

--
787995342101b4c181291cde9ecea3048536e4bd by Abseil Team <absl-team@google.com>:

Update comment to indicate finite durations are less than InfiniteDuration.

PiperOrigin-RevId: 213660328

--
d78f0dce7cc31218807e96d93b9e8513b6c80b24 by Jon Cohen <cohenjon@google.com>:

s/invariant/contract in the exceptions safety testing framework.  This is a better term as these can be type invariants or function post conditions.  They also are very similar ground as to what is covered by c++20 Contracts (and could even be replaced by them.

PiperOrigin-RevId: 213631019

--
0b3ff1a640de9a7391a6c233568802cf86245b0e by Abseil Team <absl-team@google.com>:

Add noinline attribute for GetStackTrace/GetStackFrames/... so the skipped frames will not change because of inlining difference.

PiperOrigin-RevId: 213009637
GitOrigin-RevId: eca34da4ccb7bb6a580f1364dff9ca053418fa3b
Change-Id: Iff1022fd24e440fcbdf3c4ab2a915ca8954daa31

1 files changed, 69 insertions, 69 deletions

diff --git a/absl/base/internal/exception_safety_testing.h b/absl/base/internal/exception_safety_testing.h
index de4f0e2827cb..5665a1b67db2 100644
--- a/absl/base/internal/exception_safety_testing.h
+++ b/absl/base/internal/exception_safety_testing.h
@@ -191,19 +191,19 @@ class TrackedObject {
   ~TrackedObject() noexcept { ConstructorTracker::ObjectDestructed(this); }
 };
 
-template <typename Factory, typename Operation, typename Invariant>
-absl::optional<testing::AssertionResult> TestSingleInvariantAtCountdownImpl(
+template <typename Factory, typename Operation, typename Contract>
+absl::optional<testing::AssertionResult> TestSingleContractAtCountdownImpl(
     const Factory& factory, const Operation& operation, int count,
-    const Invariant& invariant) {
+    const Contract& contract) {
   auto t_ptr = factory();
   absl::optional<testing::AssertionResult> current_res;
   SetCountdown(count);
   try {
     operation(t_ptr.get());
   } catch (const exceptions_internal::TestException& e) {
-    current_res.emplace(invariant(t_ptr.get()));
+    current_res.emplace(contract(t_ptr.get()));
     if (!current_res.value()) {
-      *current_res << e.what() << " failed invariant check";
+      *current_res << e.what() << " failed contract check";
     }
   }
   UnsetCountdown();
@@ -211,22 +211,22 @@ absl::optional<testing::AssertionResult> TestSingleInvariantAtCountdownImpl(
 }
 
 template <typename Factory, typename Operation>
-absl::optional<testing::AssertionResult> TestSingleInvariantAtCountdownImpl(
+absl::optional<testing::AssertionResult> TestSingleContractAtCountdownImpl(
     const Factory& factory, const Operation& operation, int count,
     StrongGuaranteeTagType) {
   using TPtr = typename decltype(factory())::pointer;
   auto t_is_strong = [&](TPtr t) { return *t == *factory(); };
-  return TestSingleInvariantAtCountdownImpl(factory, operation, count,
-                                            t_is_strong);
+  return TestSingleContractAtCountdownImpl(factory, operation, count,
+                                           t_is_strong);
 }
 
-template <typename Factory, typename Operation, typename Invariant>
-int TestSingleInvariantAtCountdown(
+template <typename Factory, typename Operation, typename Contract>
+int TestSingleContractAtCountdown(
     const Factory& factory, const Operation& operation, int count,
-    const Invariant& invariant,
+    const Contract& contract,
     absl::optional<testing::AssertionResult>* reduced_res) {
   // If reduced_res is empty, it means the current call to
-  // TestSingleInvariantAtCountdown(...) is the first test being run so we do
+  // TestSingleContractAtCountdown(...) is the first test being run so we do
   // want to run it. Alternatively, if it's not empty (meaning a previous test
   // has run) we want to check if it passed. If the previous test did pass, we
   // want to contine running tests so we do want to run the current one. If it
@@ -234,22 +234,22 @@ int TestSingleInvariantAtCountdown(
   // output. If that's the case, we do not run the current test and instead we
   // simply return.
   if (!reduced_res->has_value() || reduced_res->value()) {
-    *reduced_res = TestSingleInvariantAtCountdownImpl(factory, operation, count,
-                                                      invariant);
+    *reduced_res =
+        TestSingleContractAtCountdownImpl(factory, operation, count, contract);
   }
   return 0;
 }
 
-template <typename Factory, typename Operation, typename... Invariants>
-inline absl::optional<testing::AssertionResult> TestAllInvariantsAtCountdown(
+template <typename Factory, typename Operation, typename... Contracts>
+inline absl::optional<testing::AssertionResult> TestAllContractsAtCountdown(
     const Factory& factory, const Operation& operation, int count,
-    const Invariants&... invariants) {
+    const Contracts&... contracts) {
   absl::optional<testing::AssertionResult> reduced_res;
 
   // Run each checker, short circuiting after the first failure
   int dummy[] = {
-      0, (TestSingleInvariantAtCountdown(factory, operation, count, invariants,
-                                         &reduced_res))...};
+      0, (TestSingleContractAtCountdown(factory, operation, count, contracts,
+                                        &reduced_res))...};
   static_cast<void>(dummy);
   return reduced_res;
 }
@@ -884,15 +884,15 @@ class DefaultFactory {
   T t_;
 };
 
-template <size_t LazyInvariantsCount, typename LazyFactory,
+template <size_t LazyContractsCount, typename LazyFactory,
           typename LazyOperation>
 using EnableIfTestable = typename absl::enable_if_t<
-    LazyInvariantsCount != 0 &&
+    LazyContractsCount != 0 &&
     !std::is_same<LazyFactory, UninitializedT>::value &&
     !std::is_same<LazyOperation, UninitializedT>::value>;
 
 template <typename Factory = UninitializedT,
-          typename Operation = UninitializedT, typename... Invariants>
+          typename Operation = UninitializedT, typename... Contracts>
 class ExceptionSafetyTester;
 
 }  // namespace exceptions_internal
@@ -903,7 +903,7 @@ namespace exceptions_internal {
 
 /*
  * Builds a tester object that tests if performing a operation on a T follows
- * exception safety guarantees. Verification is done via invariant assertion
+ * exception safety guarantees. Verification is done via contract assertion
  * callbacks applied to T instances post-throw.
  *
  * Template parameters for ExceptionSafetyTester:
@@ -921,18 +921,18 @@ namespace exceptions_internal {
  *   fresh T instance so it's free to modify and destroy the T instances as it
  *   pleases.
  *
- * - Invariants...: The invariant assertion callback objects (passed in via
- *   tester.WithInvariants(...)) must be invocable with the signature
+ * - Contracts...: The contract assertion callback objects (passed in via
+ *   tester.WithContracts(...)) must be invocable with the signature
  *   `testing::AssertionResult operator()(T*) const` where T is the type being
- *   tested. Invariant assertion callbacks are provided T instances post-throw.
- *   They must return testing::AssertionSuccess when the type invariants of the
- *   provided T instance hold. If the type invariants of the T instance do not
+ *   tested. Contract assertion callbacks are provided T instances post-throw.
+ *   They must return testing::AssertionSuccess when the type contracts of the
+ *   provided T instance hold. If the type contracts of the T instance do not
  *   hold, they must return testing::AssertionFailure. Execution order of
- *   Invariants... is unspecified. They will each individually get a fresh T
+ *   Contracts... is unspecified. They will each individually get a fresh T
  *   instance so they are free to modify and destroy the T instances as they
  *   please.
  */
-template <typename Factory, typename Operation, typename... Invariants>
+template <typename Factory, typename Operation, typename... Contracts>
 class ExceptionSafetyTester {
  public:
   /*
@@ -948,7 +948,7 @@ class ExceptionSafetyTester {
    *   tester.WithFactory(...).
    */
   template <typename T>
-  ExceptionSafetyTester<DefaultFactory<T>, Operation, Invariants...>
+  ExceptionSafetyTester<DefaultFactory<T>, Operation, Contracts...>
   WithInitialValue(const T& t) const {
     return WithFactory(DefaultFactory<T>(t));
   }
@@ -961,9 +961,9 @@ class ExceptionSafetyTester {
    * method tester.WithInitialValue(...).
    */
   template <typename NewFactory>
-  ExceptionSafetyTester<absl::decay_t<NewFactory>, Operation, Invariants...>
+  ExceptionSafetyTester<absl::decay_t<NewFactory>, Operation, Contracts...>
   WithFactory(const NewFactory& new_factory) const {
-    return {new_factory, operation_, invariants_};
+    return {new_factory, operation_, contracts_};
   }
 
   /*
@@ -972,39 +972,39 @@ class ExceptionSafetyTester {
    * tester.
    */
   template <typename NewOperation>
-  ExceptionSafetyTester<Factory, absl::decay_t<NewOperation>, Invariants...>
+  ExceptionSafetyTester<Factory, absl::decay_t<NewOperation>, Contracts...>
   WithOperation(const NewOperation& new_operation) const {
-    return {factory_, new_operation, invariants_};
+    return {factory_, new_operation, contracts_};
   }
 
   /*
-   * Returns a new ExceptionSafetyTester with the provided MoreInvariants...
-   * combined with the Invariants... that were already included in the instance
-   * on which the method was called. Invariants... cannot be removed or replaced
+   * Returns a new ExceptionSafetyTester with the provided MoreContracts...
+   * combined with the Contracts... that were already included in the instance
+   * on which the method was called. Contracts... cannot be removed or replaced
    * once added to an ExceptionSafetyTester instance. A fresh object must be
-   * created in order to get an empty Invariants... list.
+   * created in order to get an empty Contracts... list.
    *
-   * In addition to passing in custom invariant assertion callbacks, this method
+   * In addition to passing in custom contract assertion callbacks, this method
    * accepts `testing::strong_guarantee` as an argument which checks T instances
    * post-throw against freshly created T instances via operator== to verify
    * that any state changes made during the execution of the operation were
    * properly rolled back.
    */
-  template <typename... MoreInvariants>
-  ExceptionSafetyTester<Factory, Operation, Invariants...,
-                        absl::decay_t<MoreInvariants>...>
-  WithInvariants(const MoreInvariants&... more_invariants) const {
-    return {factory_, operation_,
-            std::tuple_cat(invariants_,
-                           std::tuple<absl::decay_t<MoreInvariants>...>(
-                               more_invariants...))};
+  template <typename... MoreContracts>
+  ExceptionSafetyTester<Factory, Operation, Contracts...,
+                        absl::decay_t<MoreContracts>...>
+  WithContracts(const MoreContracts&... more_contracts) const {
+    return {
+        factory_, operation_,
+        std::tuple_cat(contracts_, std::tuple<absl::decay_t<MoreContracts>...>(
+                                       more_contracts...))};
   }
 
   /*
    * Returns a testing::AssertionResult that is the reduced result of the
    * exception safety algorithm. The algorithm short circuits and returns
-   * AssertionFailure after the first invariant callback returns an
-   * AssertionFailure. Otherwise, if all invariant callbacks return an
+   * AssertionFailure after the first contract callback returns an
+   * AssertionFailure. Otherwise, if all contract callbacks return an
    * AssertionSuccess, the reduced result is AssertionSuccess.
    *
    * The passed-in testable operation will not be saved in a new tester instance
@@ -1013,33 +1013,33 @@ class ExceptionSafetyTester {
    *
    * Preconditions for tester.Test(const NewOperation& new_operation):
    *
-   * - May only be called after at least one invariant assertion callback and a
+   * - May only be called after at least one contract assertion callback and a
    *   factory or initial value have been provided.
    */
   template <
       typename NewOperation,
-      typename = EnableIfTestable<sizeof...(Invariants), Factory, NewOperation>>
+      typename = EnableIfTestable<sizeof...(Contracts), Factory, NewOperation>>
   testing::AssertionResult Test(const NewOperation& new_operation) const {
-    return TestImpl(new_operation, absl::index_sequence_for<Invariants...>());
+    return TestImpl(new_operation, absl::index_sequence_for<Contracts...>());
   }
 
   /*
    * Returns a testing::AssertionResult that is the reduced result of the
    * exception safety algorithm. The algorithm short circuits and returns
-   * AssertionFailure after the first invariant callback returns an
-   * AssertionFailure. Otherwise, if all invariant callbacks return an
+   * AssertionFailure after the first contract callback returns an
+   * AssertionFailure. Otherwise, if all contract callbacks return an
    * AssertionSuccess, the reduced result is AssertionSuccess.
    *
    * Preconditions for tester.Test():
    *
-   * - May only be called after at least one invariant assertion callback, a
+   * - May only be called after at least one contract assertion callback, a
    *   factory or initial value and a testable operation have been provided.
    */
-  template <typename LazyOperation = Operation,
-            typename =
-                EnableIfTestable<sizeof...(Invariants), Factory, LazyOperation>>
+  template <
+      typename LazyOperation = Operation,
+      typename = EnableIfTestable<sizeof...(Contracts), Factory, LazyOperation>>
   testing::AssertionResult Test() const {
-    return TestImpl(operation_, absl::index_sequence_for<Invariants...>());
+    return TestImpl(operation_, absl::index_sequence_for<Contracts...>());
   }
 
  private:
@@ -1051,8 +1051,8 @@ class ExceptionSafetyTester {
   ExceptionSafetyTester() {}
 
   ExceptionSafetyTester(const Factory& f, const Operation& o,
-                        const std::tuple<Invariants...>& i)
-      : factory_(f), operation_(o), invariants_(i) {}
+                        const std::tuple<Contracts...>& i)
+      : factory_(f), operation_(o), contracts_(i) {}
 
   template <typename SelectedOperation, size_t... Indices>
   testing::AssertionResult TestImpl(const SelectedOperation& selected_operation,
@@ -1064,28 +1064,28 @@ class ExceptionSafetyTester {
 
       // Run the full exception safety test algorithm for the current countdown
       auto reduced_res =
-          TestAllInvariantsAtCountdown(factory_, selected_operation, count,
-                                       std::get<Indices>(invariants_)...);
-      // If there is no value in the optional, no invariants were run because no
+          TestAllContractsAtCountdown(factory_, selected_operation, count,
+                                      std::get<Indices>(contracts_)...);
+      // If there is no value in the optional, no contracts were run because no
       // exception was thrown. This means that the test is complete and the loop
       // can exit successfully.
       if (!reduced_res.has_value()) {
         return testing::AssertionSuccess();
       }
-      // If the optional is not empty and the value is falsy, an invariant check
+      // If the optional is not empty and the value is falsy, an contract check
       // failed so the test must exit to propegate the failure.
       if (!reduced_res.value()) {
         return reduced_res.value();
       }
       // If the optional is not empty and the value is not falsy, it means
-      // exceptions were thrown but the invariants passed so the test must
+      // exceptions were thrown but the contracts passed so the test must
       // continue to run.
     }
   }
 
   Factory factory_;
   Operation operation_;
-  std::tuple<Invariants...> invariants_;
+  std::tuple<Contracts...> contracts_;
 };
 
 }  // namespace exceptions_internal
@@ -1096,7 +1096,7 @@ class ExceptionSafetyTester {
  * instances of ExceptionSafetyTester.
  *
  * In order to test a T for exception safety, a factory for that T, a testable
- * operation, and at least one invariant callback returning an assertion
+ * operation, and at least one contract callback returning an assertion
  * result must be applied using the respective methods.
  */
 inline exceptions_internal::ExceptionSafetyTester<>