Export of internal Abseil changes

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a3e58c1870a9626039f4d178d2d599319bd9f8a8 by Matt Kulukundis <kfm@google.com>:

Allow MakeCordFromExternal to take a zero arg releaser.

PiperOrigin-RevId: 298650274

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01897c4a9bb99f3dc329a794019498ad345ddebd by Samuel Benzaquen <sbenza@google.com>:

Reduce library bloat for absl::Flag by moving the definition of base virtual functions to a .cc file.
This removes the duplicate symbols in user translation units and  has the side effect of moving the vtable definition too (re key function)

PiperOrigin-RevId: 298617920

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190f0d3782c63aed01046886d7fbc1be5bca2de9 by Derek Mauro <dmauro@google.com>:

Import GitHub #596: Unbreak stacktrace code for UWP apps

PiperOrigin-RevId: 298600834

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cd5cf6f8c87b35b85a9584e94da2a99057345b73 by Gennadiy Rozental <rogeeff@google.com>:

Use union of heap allocated pointer, one word atomic and two word atomic to represent flags value.

Any type T, which is trivially copy-able and with with sizeof(T) <= 8, will be stored in atomic int64_t.
Any type T, which is trivially copy-able and with with 8 < sizeof(T) <= 16, will be stored in atomic AlignedTwoWords.

We also introducing value storage type to distinguish these cases.

PiperOrigin-RevId: 298497200

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f8fe7bd53bfed601f002f521e34ab4bc083fc28b by Matthew Brown <matthewbr@google.com>:

Ensure a deep copy and proper equality on absl::Status::ErasePayload

PiperOrigin-RevId: 298482742

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a5c9ccddf4b04f444e3f7e27dbc14faf1fcb5373 by Gennadiy Rozental <rogeeff@google.com>:

Change ChunkIterator implementation to use fixed capacity collection of CordRep*. We can now assume that depth never exceeds 91. That makes comparison operator exception safe.

I've tested that with this CL we do not observe an overhead of chunk_end. Compiler optimized this iterator completely.

PiperOrigin-RevId: 298458472

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327ea5e8910bc388b03389c730763f9823abfce5 by Abseil Team <absl-team@google.com>:

Minor cleanups in b-tree code:
- Rename some variables: fix issues of different param names between definition/declaration, move away from `x` as a default meaningless variable name.
- Make init_leaf/init_internal be non-static methods (they already take the node as the first parameter).
- In internal_emplace/try_shrink, update root/rightmost the same way as in insert_unique/insert_multi.
- Replace a TODO with a comment.

PiperOrigin-RevId: 298432836

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8020ce9ec8558ee712d9733ae3d660ac1d3ffe1a by Abseil Team <absl-team@google.com>:

Guard against unnecessary copy in case the buffer is empty. This is important in cases were the user is explicitly tuning their chunks to match PiecewiseChunkSize().

PiperOrigin-RevId: 298366044

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89324441d1c0c697c90ba7d8fc63639805fcaa9d by Abseil Team <absl-team@google.com>:

Internal change

PiperOrigin-RevId: 298219363
GitOrigin-RevId: a3e58c1870a9626039f4d178d2d599319bd9f8a8
Change-Id: I28dffc684b6fd0292b94807b88ec6664d5d0e183

absl/base/log_severity_test.cc

@@ -53,7 +53,7 @@ TEST(StreamTest, Works) {
 }
 
 static_assert(
-    absl::flags_internal::IsAtomicFlagTypeTrait<absl::LogSeverity>::value,
+    absl::flags_internal::FlagUseOneWordStorage<absl::LogSeverity>::value,
     "Flags of type absl::LogSeverity ought to be lock-free.");
 
 using ParseFlagFromOutOfRangeIntegerTest = TestWithParam<int64_t>;

absl/container/btree_benchmark.cc

@@ -538,19 +538,19 @@ struct BigType {
   BigType() : BigType(0) {}
   explicit BigType(int x) { std::iota(values.begin(), values.end(), x); }
 
-  void Copy(const BigType& x) {
-    for (int i = 0; i < Size && i < Copies; ++i) values[i] = x.values[i];
+  void Copy(const BigType& other) {
+    for (int i = 0; i < Size && i < Copies; ++i) values[i] = other.values[i];
     // If Copies > Size, do extra copies.
     for (int i = Size, idx = 0; i < Copies; ++i) {
-      int64_t tmp = x.values[idx];
+      int64_t tmp = other.values[idx];
       benchmark::DoNotOptimize(tmp);
       idx = idx + 1 == Size ? 0 : idx + 1;
     }
   }
 
-  BigType(const BigType& x) { Copy(x); }
-  BigType& operator=(const BigType& x) {
-    Copy(x);
+  BigType(const BigType& other) { Copy(other); }
+  BigType& operator=(const BigType& other) {
+    Copy(other);
     return *this;
   }
 
@@ -641,14 +641,14 @@ struct BigTypePtr {
   explicit BigTypePtr(int x) {
     ptr = absl::make_unique<BigType<Size, Size>>(x);
   }
-  BigTypePtr(const BigTypePtr& x) {
-    ptr = absl::make_unique<BigType<Size, Size>>(*x.ptr);
+  BigTypePtr(const BigTypePtr& other) {
+    ptr = absl::make_unique<BigType<Size, Size>>(*other.ptr);
   }
-  BigTypePtr(BigTypePtr&& x) noexcept = default;
-  BigTypePtr& operator=(const BigTypePtr& x) {
-    ptr = absl::make_unique<BigType<Size, Size>>(*x.ptr);
+  BigTypePtr(BigTypePtr&& other) noexcept = default;
+  BigTypePtr& operator=(const BigTypePtr& other) {
+    ptr = absl::make_unique<BigType<Size, Size>>(*other.ptr);
   }
-  BigTypePtr& operator=(BigTypePtr&& x) noexcept = default;
+  BigTypePtr& operator=(BigTypePtr&& other) noexcept = default;
 
   bool operator<(const BigTypePtr& other) const { return *ptr < *other.ptr; }
   bool operator==(const BigTypePtr& other) const { return *ptr == *other.ptr; }

absl/container/btree_map.h

@@ -318,7 +318,7 @@ class btree_map
   //   Extracts the element at the indicated position and returns a node handle
   //   owning that extracted data.
   //
-  // template <typename K> node_type extract(const K& x):
+  // template <typename K> node_type extract(const K& k):
   //
   //   Extracts the element with the key matching the passed key value and
   //   returns a node handle owning that extracted data. If the `btree_map`
@@ -645,7 +645,7 @@ class btree_multimap
   //   Extracts the element at the indicated position and returns a node handle
   //   owning that extracted data.
   //
-  // template <typename K> node_type extract(const K& x):
+  // template <typename K> node_type extract(const K& k):
   //
   //   Extracts the element with the key matching the passed key value and
   //   returns a node handle owning that extracted data. If the `btree_multimap`

absl/container/btree_set.h

@@ -263,7 +263,7 @@ class btree_set
   //   Extracts the element at the indicated position and returns a node handle
   //   owning that extracted data.
   //
-  // template <typename K> node_type extract(const K& x):
+  // template <typename K> node_type extract(const K& k):
   //
   //   Extracts the element with the key matching the passed key value and
   //   returns a node handle owning that extracted data. If the `btree_set`
@@ -567,7 +567,7 @@ class btree_multiset
   //   Extracts the element at the indicated position and returns a node handle
   //   owning that extracted data.
   //
-  // template <typename K> node_type extract(const K& x):
+  // template <typename K> node_type extract(const K& k):
   //
   //   Extracts the element with the key matching the passed key value and
   //   returns a node handle owning that extracted data. If the `btree_multiset`

absl/container/btree_test.cc

@@ -89,8 +89,8 @@ class base_checker {
 
  public:
   base_checker() : const_tree_(tree_) {}
-  base_checker(const base_checker &x)
-      : tree_(x.tree_), const_tree_(tree_), checker_(x.checker_) {}
+  base_checker(const base_checker &other)
+      : tree_(other.tree_), const_tree_(tree_), checker_(other.checker_) {}
   template <typename InputIterator>
   base_checker(InputIterator b, InputIterator e)
       : tree_(b, e), const_tree_(tree_), checker_(b, e) {}
@@ -124,11 +124,11 @@ class base_checker {
     }
     return tree_iter;
   }
-  void value_check(const value_type &x) {
+  void value_check(const value_type &v) {
     typename KeyOfValue<typename TreeType::key_type,
                         typename TreeType::value_type>::type key_of_value;
-    const key_type &key = key_of_value(x);
-    CheckPairEquals(*find(key), x);
+    const key_type &key = key_of_value(v);
+    CheckPairEquals(*find(key), v);
     lower_bound(key);
     upper_bound(key);
     equal_range(key);
@@ -187,9 +187,9 @@ class base_checker {
     return res;
   }
 
-  base_checker &operator=(const base_checker &x) {
-    tree_ = x.tree_;
-    checker_ = x.checker_;
+  base_checker &operator=(const base_checker &other) {
+    tree_ = other.tree_;
+    checker_ = other.checker_;
     return *this;
   }
 
@@ -250,9 +250,9 @@ class base_checker {
     tree_.clear();
     checker_.clear();
   }
-  void swap(base_checker &x) {
-    tree_.swap(x.tree_);
-    checker_.swap(x.checker_);
+  void swap(base_checker &other) {
+    tree_.swap(other.tree_);
+    checker_.swap(other.checker_);
   }
 
   void verify() const {
@@ -323,28 +323,28 @@ class unique_checker : public base_checker<TreeType, CheckerType> {
 
  public:
   unique_checker() : super_type() {}
-  unique_checker(const unique_checker &x) : super_type(x) {}
+  unique_checker(const unique_checker &other) : super_type(other) {}
   template <class InputIterator>
   unique_checker(InputIterator b, InputIterator e) : super_type(b, e) {}
   unique_checker &operator=(const unique_checker &) = default;
 
   // Insertion routines.
-  std::pair<iterator, bool> insert(const value_type &x) {
+  std::pair<iterator, bool> insert(const value_type &v) {
     int size = this->tree_.size();
     std::pair<typename CheckerType::iterator, bool> checker_res =
-        this->checker_.insert(x);
-    std::pair<iterator, bool> tree_res = this->tree_.insert(x);
+        this->checker_.insert(v);
+    std::pair<iterator, bool> tree_res = this->tree_.insert(v);
     CheckPairEquals(*tree_res.first, *checker_res.first);
     EXPECT_EQ(tree_res.second, checker_res.second);
     EXPECT_EQ(this->tree_.size(), this->checker_.size());
     EXPECT_EQ(this->tree_.size(), size + tree_res.second);
     return tree_res;
   }
-  iterator insert(iterator position, const value_type &x) {
+  iterator insert(iterator position, const value_type &v) {
     int size = this->tree_.size();
     std::pair<typename CheckerType::iterator, bool> checker_res =
-        this->checker_.insert(x);
-    iterator tree_res = this->tree_.insert(position, x);
+        this->checker_.insert(v);
+    iterator tree_res = this->tree_.insert(position, v);
     CheckPairEquals(*tree_res, *checker_res.first);
     EXPECT_EQ(this->tree_.size(), this->checker_.size());
     EXPECT_EQ(this->tree_.size(), size + checker_res.second);
@@ -371,25 +371,25 @@ class multi_checker : public base_checker<TreeType, CheckerType> {
 
  public:
   multi_checker() : super_type() {}
-  multi_checker(const multi_checker &x) : super_type(x) {}
+  multi_checker(const multi_checker &other) : super_type(other) {}
   template <class InputIterator>
   multi_checker(InputIterator b, InputIterator e) : super_type(b, e) {}
   multi_checker &operator=(const multi_checker &) = default;
 
   // Insertion routines.
-  iterator insert(const value_type &x) {
+  iterator insert(const value_type &v) {
     int size = this->tree_.size();
-    auto checker_res = this->checker_.insert(x);
-    iterator tree_res = this->tree_.insert(x);
+    auto checker_res = this->checker_.insert(v);
+    iterator tree_res = this->tree_.insert(v);
     CheckPairEquals(*tree_res, *checker_res);
     EXPECT_EQ(this->tree_.size(), this->checker_.size());
     EXPECT_EQ(this->tree_.size(), size + 1);
     return tree_res;
   }
-  iterator insert(iterator position, const value_type &x) {
+  iterator insert(iterator position, const value_type &v) {
     int size = this->tree_.size();
-    auto checker_res = this->checker_.insert(x);
-    iterator tree_res = this->tree_.insert(position, x);
+    auto checker_res = this->checker_.insert(v);
+    iterator tree_res = this->tree_.insert(position, v);
     CheckPairEquals(*tree_res, *checker_res);
     EXPECT_EQ(this->tree_.size(), this->checker_.size());
     EXPECT_EQ(this->tree_.size(), size + 1);