Roll abseil_revision e9e9b9fc74..a4798817e8

Change Log:
https://chromium.googlesource.com/external/github.com/abseil/abseil-cpp/+log/e9e9b9fc74..a4798817e8
Full diff:
https://chromium.googlesource.com/external/github.com/abseil/abseil-cpp/+/e9e9b9fc74..a4798817e8

Bug: None
Change-Id: Ic3de112f7c9f241984b6d8e9fdce79c0b043469b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2532257
Commit-Queue: Danil Chapovalov <danilchap@chromium.org>
Commit-Queue: Mirko Bonadei <mbonadei@chromium.org>
Auto-Submit: Danil Chapovalov <danilchap@chromium.org>
Reviewed-by: Mirko Bonadei <mbonadei@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826254}

third_party/abseil-cpp/README.chromium

@@ -4,7 +4,7 @@ URL: https://github.com/abseil/abseil-cpp
 License: Apache 2.0
 License File: LICENSE
 Version: 0
-Revision: e9e9b9fc74388482ab748cad33cd9732a2b75d31
+Revision: a4798817e824a5c45689933bc62338f3c7d6961b
 Security Critical: yes
 
 Description:

third_party/abseil-cpp/absl/base/internal/low_level_scheduling.h

@@ -61,6 +61,8 @@ class SchedulingGuard {
  public:
   // Returns true iff the calling thread may be cooperatively rescheduled.
   static bool ReschedulingIsAllowed();
+  SchedulingGuard(const SchedulingGuard&) = delete;
+  SchedulingGuard& operator=(const SchedulingGuard&) = delete;
 
  private:
   // Disable cooperative rescheduling of the calling thread.  It may still
@@ -101,9 +103,6 @@ class SchedulingGuard {
   friend class SchedulingHelper;
   friend class SpinLock;
   friend int absl::synchronization_internal::MutexDelay(int32_t c, int mode);
-
-  SchedulingGuard(const SchedulingGuard&) = delete;
-  SchedulingGuard& operator=(const SchedulingGuard&) = delete;
 };
 
 //------------------------------------------------------------------------------

third_party/abseil-cpp/absl/base/internal/raw_logging.h

@@ -78,6 +78,8 @@
     ::absl::raw_logging_internal::internal_log_function(                     \
         ABSL_RAW_LOGGING_INTERNAL_##severity,                                \
         absl_raw_logging_internal_filename, __LINE__, message);              \
+    if (ABSL_RAW_LOGGING_INTERNAL_##severity == ::absl::LogSeverity::kFatal) \
+      ABSL_INTERNAL_UNREACHABLE;                                             \
   } while (0)
 
 #define ABSL_INTERNAL_CHECK(condition, message)                    \

third_party/abseil-cpp/absl/base/macros.h

@@ -144,4 +144,15 @@ ABSL_NAMESPACE_END
 #define ABSL_INTERNAL_RETHROW do {} while (false)
 #endif  // ABSL_HAVE_EXCEPTIONS
 
+// `ABSL_INTERNAL_UNREACHABLE` is an unreachable statement.  A program which
+// reaches one has undefined behavior, and the compiler may optimize
+// accordingly.
+#if defined(__GNUC__) || ABSL_HAVE_BUILTIN(__builtin_unreachable)
+#define ABSL_INTERNAL_UNREACHABLE __builtin_unreachable()
+#elif defined(_MSC_VER)
+#define ABSL_INTERNAL_UNREACHABLE __assume(0)
+#else
+#define ABSL_INTERNAL_UNREACHABLE
+#endif
+
 #endif  // ABSL_BASE_MACROS_H_

third_party/abseil-cpp/absl/debugging/internal/stacktrace_aarch64-inl.inc

@@ -37,8 +37,11 @@ static const unsigned char* GetKernelRtSigreturnAddress() {
   absl::debugging_internal::VDSOSupport vdso;
   if (vdso.IsPresent()) {
     absl::debugging_internal::VDSOSupport::SymbolInfo symbol_info;
-    if (!vdso.LookupSymbol("__kernel_rt_sigreturn", "LINUX_2.6.39", STT_FUNC,
-                           &symbol_info) ||
+    auto lookup = [&](int type) {
+      return vdso.LookupSymbol("__kernel_rt_sigreturn", "LINUX_2.6.39", type,
+                               &symbol_info);
+    };
+    if ((!lookup(STT_FUNC) && !lookup(STT_NOTYPE)) ||
         symbol_info.address == nullptr) {
       // Unexpected: VDSO is present, yet the expected symbol is missing
       // or null.

third_party/abseil-cpp/absl/status/internal/statusor_internal.h

@@ -17,6 +17,7 @@
 #include <type_traits>
 #include <utility>
 
+#include "absl/base/attributes.h"
 #include "absl/meta/type_traits.h"
 #include "absl/status/status.h"
 #include "absl/utility/utility.h"
@@ -135,18 +136,14 @@ class Helper {
  public:
   // Move type-agnostic error handling to the .cc.
   static void HandleInvalidStatusCtorArg(Status*);
-  static void Crash(const absl::Status& status);
+  ABSL_ATTRIBUTE_NORETURN static void Crash(const absl::Status& status);
 };
 
 // Construct an instance of T in `p` through placement new, passing Args... to
 // the constructor.
 // This abstraction is here mostly for the gcc performance fix.
 template <typename T, typename... Args>
-void PlacementNew(void* p, Args&&... args) {
-#if defined(__GNUC__) && !defined(__clang__)
-  // Teach gcc that 'p' cannot be null, fixing code size issues.
-  if (p == nullptr) __builtin_unreachable();
-#endif
+ABSL_ATTRIBUTE_NONNULL(1) void PlacementNew(void* p, Args&&... args) {
   new (p) T(std::forward<Args>(args)...);
 }
 

third_party/abseil-cpp/absl/strings/internal/str_split_internal.h

@@ -51,9 +51,9 @@ ABSL_NAMESPACE_BEGIN
 namespace strings_internal {
 
 // This class is implicitly constructible from everything that absl::string_view
-// is implicitly constructible from. If it's constructed from a temporary
-// string, the data is moved into a data member so its lifetime matches that of
-// the ConvertibleToStringView instance.
+// is implicitly constructible from, except for rvalue strings.  This means it
+// can be used as a function parameter in places where passing a temporary
+// string might cause memory lifetime issues.
 class ConvertibleToStringView {
  public:
   ConvertibleToStringView(const char* s)  // NOLINT(runtime/explicit)
@@ -65,57 +65,13 @@ class ConvertibleToStringView {
       : value_(s) {}
 
   // Matches rvalue strings and moves their data to a member.
-  ConvertibleToStringView(std::string&& s)  // NOLINT(runtime/explicit)
-      : copy_(std::move(s)), value_(copy_), self_referential_(true) {}
-
-  ConvertibleToStringView(const ConvertibleToStringView& other)
-      : value_(other.value_), self_referential_(other.self_referential_) {
-    if (other.self_referential_) {
-      new (&copy_) std::string(other.copy_);
-      value_ = copy_;
-    }
-  }
-
-  ConvertibleToStringView(ConvertibleToStringView&& other)
-      : value_(other.value_), self_referential_(other.self_referential_) {
-    if (other.self_referential_) {
-      new (&copy_) std::string(std::move(other.copy_));
-      value_ = copy_;
-    }
-  }
-
-  ConvertibleToStringView& operator=(ConvertibleToStringView other) {
-    this->~ConvertibleToStringView();
-    new (this) ConvertibleToStringView(std::move(other));
-    return *this;
-  }
+  ConvertibleToStringView(std::string&& s) = delete;
+  ConvertibleToStringView(const std::string&& s) = delete;
 
   absl::string_view value() const { return value_; }
 
-  ~ConvertibleToStringView() { MaybeReleaseCopy(); }
-
  private:
-  void MaybeReleaseCopy() {
-    if (self_referential_) {
-      // An explicit destructor call cannot be a qualified name such as
-      // std::string. The "using" declaration works around this
-      // issue by creating an unqualified name for the destructor.
-      using string_type = std::string;
-      copy_.~string_type();
-    }
-  }
-  struct Unused {  // MSVC disallows unions with only 1 member.
-  };
-  // Holds the data moved from temporary std::string arguments. Declared first
-  // so that 'value' can refer to 'copy_'.
-  union {
-    std::string copy_;
-    Unused unused_;
-  };
-
   absl::string_view value_;
-  // true if value_ refers to the internal copy_ member.
-  bool self_referential_ = false;
 };
 
 // An iterator that enumerates the parts of a string from a Splitter. The text
@@ -288,7 +244,11 @@ struct SplitterIsConvertibleTo
 // the split strings: only strings for which the predicate returns true will be
 // kept. A Predicate object is any unary functor that takes an absl::string_view
 // and returns bool.
-template <typename Delimiter, typename Predicate>
+//
+// The StringType parameter can be either string_view or string, depending on
+// whether the Splitter refers to a string stored elsewhere, or if the string
+// resides inside the Splitter itself.
+template <typename Delimiter, typename Predicate, typename StringType>
 class Splitter {
  public:
   using DelimiterType = Delimiter;
@@ -296,12 +256,12 @@ class Splitter {
   using const_iterator = strings_internal::SplitIterator<Splitter>;
   using value_type = typename std::iterator_traits<const_iterator>::value_type;
 
-  Splitter(ConvertibleToStringView input_text, Delimiter d, Predicate p)
+  Splitter(StringType input_text, Delimiter d, Predicate p)
       : text_(std::move(input_text)),
         delimiter_(std::move(d)),
         predicate_(std::move(p)) {}
 
-  absl::string_view text() const { return text_.value(); }
+  absl::string_view text() const { return text_; }
   const Delimiter& delimiter() const { return delimiter_; }
   const Predicate& predicate() const { return predicate_; }
 
@@ -458,7 +418,7 @@ class Splitter {
     };
   };
 
-  ConvertibleToStringView text_;
+  StringType text_;
   Delimiter delimiter_;
   Predicate predicate_;
 };

third_party/abseil-cpp/absl/strings/str_split.h

@@ -369,6 +369,12 @@ struct SkipWhitespace {
   }
 };
 
+template <typename T>
+using EnableSplitIfString =
+    typename std::enable_if<std::is_same<T, std::string>::value ||
+                            std::is_same<T, const std::string>::value,
+                            int>::type;
+
 //------------------------------------------------------------------------------
 //                                  StrSplit()
 //------------------------------------------------------------------------------
@@ -489,22 +495,50 @@ struct SkipWhitespace {
 // Try not to depend on this distinction because the bug may one day be fixed.
 template <typename Delimiter>
 strings_internal::Splitter<
-    typename strings_internal::SelectDelimiter<Delimiter>::type, AllowEmpty>
+    typename strings_internal::SelectDelimiter<Delimiter>::type, AllowEmpty,
+    absl::string_view>
 StrSplit(strings_internal::ConvertibleToStringView text, Delimiter d) {
   using DelimiterType =
       typename strings_internal::SelectDelimiter<Delimiter>::type;
-  return strings_internal::Splitter<DelimiterType, AllowEmpty>(
+  return strings_internal::Splitter<DelimiterType, AllowEmpty,
+                                    absl::string_view>(
+      text.value(), DelimiterType(d), AllowEmpty());
+}
+
+template <typename Delimiter, typename StringType,
+          EnableSplitIfString<StringType> = 0>
+strings_internal::Splitter<
+    typename strings_internal::SelectDelimiter<Delimiter>::type, AllowEmpty,
+    std::string>
+StrSplit(StringType&& text, Delimiter d) {
+  using DelimiterType =
+      typename strings_internal::SelectDelimiter<Delimiter>::type;
+  return strings_internal::Splitter<DelimiterType, AllowEmpty, std::string>(
       std::move(text), DelimiterType(d), AllowEmpty());
 }
 
 template <typename Delimiter, typename Predicate>
 strings_internal::Splitter<
-    typename strings_internal::SelectDelimiter<Delimiter>::type, Predicate>
+    typename strings_internal::SelectDelimiter<Delimiter>::type, Predicate,
+    absl::string_view>
 StrSplit(strings_internal::ConvertibleToStringView text, Delimiter d,
          Predicate p) {
   using DelimiterType =
       typename strings_internal::SelectDelimiter<Delimiter>::type;
-  return strings_internal::Splitter<DelimiterType, Predicate>(
+  return strings_internal::Splitter<DelimiterType, Predicate,
+                                    absl::string_view>(
+      text.value(), DelimiterType(d), std::move(p));
+}
+
+template <typename Delimiter, typename Predicate, typename StringType,
+          EnableSplitIfString<StringType> = 0>
+strings_internal::Splitter<
+    typename strings_internal::SelectDelimiter<Delimiter>::type, Predicate,
+    std::string>
+StrSplit(StringType&& text, Delimiter d, Predicate p) {
+  using DelimiterType =
+      typename strings_internal::SelectDelimiter<Delimiter>::type;
+  return strings_internal::Splitter<DelimiterType, Predicate, std::string>(
       std::move(text), DelimiterType(d), std::move(p));
 }
 

third_party/abseil-cpp/symbols_arm64_rel.def

@@ -730,6 +730,7 @@ EXPORTS
     ?format@detail@cctz@time_internal@absl@@YA?AV?$basic_string@DU?$char_traits@D@__1@std@@V?$allocator@D@23@@__1@std@@AEBV567@AEBV?$time_point@Vsystem_clock@chrono@__1@std@@V?$duration@_JV?$ratio@$00$00@__1@std@@@234@@chrono@67@AEBV?$duration@_JV?$ratio@$00$0DINHOKEMGIAAA@@__1@std@@@967@AEBVtime_zone@234@@Z
     ?from_chars@absl@@YA?AUfrom_chars_result@1@PEBD0AEAMW4chars_format@1@@Z
     ?from_chars@absl@@YA?AUfrom_chars_result@1@PEBD0AEANW4chars_format@1@@Z
+    ?get_weekday@detail@cctz@time_internal@absl@@YA?AW4weekday@1234@AEBV?$civil_time@Usecond_tag@detail@cctz@time_internal@absl@@@1234@@Z
     ?load_time_zone@cctz@time_internal@absl@@YA_NAEBV?$basic_string@DU?$char_traits@D@__1@std@@V?$allocator@D@23@@__1@std@@PEAVtime_zone@123@@Z
     ?local_time_zone@cctz@time_internal@absl@@YA?AVtime_zone@123@XZ
     ?lookup@time_zone@cctz@time_internal@absl@@QEBA?AUabsolute_lookup@1234@AEBV?$time_point@Vsystem_clock@chrono@__1@std@@V?$duration@_JV?$ratio@$00$00@__1@std@@@234@@chrono@__1@std@@@Z

third_party/abseil-cpp/symbols_x64_rel.def

@@ -730,6 +730,7 @@ EXPORTS
     ?format@detail@cctz@time_internal@absl@@YA?AV?$basic_string@DU?$char_traits@D@__1@std@@V?$allocator@D@23@@__1@std@@AEBV567@AEBV?$time_point@Vsystem_clock@chrono@__1@std@@V?$duration@_JV?$ratio@$00$00@__1@std@@@234@@chrono@67@AEBV?$duration@_JV?$ratio@$00$0DINHOKEMGIAAA@@__1@std@@@967@AEBVtime_zone@234@@Z
     ?from_chars@absl@@YA?AUfrom_chars_result@1@PEBD0AEAMW4chars_format@1@@Z
     ?from_chars@absl@@YA?AUfrom_chars_result@1@PEBD0AEANW4chars_format@1@@Z
+    ?get_weekday@detail@cctz@time_internal@absl@@YA?AW4weekday@1234@AEBV?$civil_time@Usecond_tag@detail@cctz@time_internal@absl@@@1234@@Z
     ?load_time_zone@cctz@time_internal@absl@@YA_NAEBV?$basic_string@DU?$char_traits@D@__1@std@@V?$allocator@D@23@@__1@std@@PEAVtime_zone@123@@Z
     ?local_time_zone@cctz@time_internal@absl@@YA?AVtime_zone@123@XZ
     ?lookup@time_zone@cctz@time_internal@absl@@QEBA?AUabsolute_lookup@1234@AEBV?$time_point@Vsystem_clock@chrono@__1@std@@V?$duration@_JV?$ratio@$00$00@__1@std@@@234@@chrono@__1@std@@@Z