aboutsummaryrefslogtreecommitdiff
path: root/NorthstarDedicatedTest/include/protobuf/arena_impl.h
blob: dba1c302c896a211b2ec8c74b8b9fc7cfc853b00 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc.  All rights reserved.
// https://developers.google.com/protocol-buffers/
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
//     * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

// This file defines an Arena allocator for better allocation performance.

#ifndef GOOGLE_PROTOBUF_ARENA_IMPL_H__
#define GOOGLE_PROTOBUF_ARENA_IMPL_H__

#include <atomic>
#include <limits>
#include <typeinfo>

#include <stubs/common.h>
#include <stubs/logging.h>

#ifdef ADDRESS_SANITIZER
#include <sanitizer/asan_interface.h>
#endif  // ADDRESS_SANITIZER

#include <port_def.inc>


namespace google {
namespace protobuf {
namespace internal {

inline constexpr size_t AlignUpTo8(size_t n) {
  // Align n to next multiple of 8 (from Hacker's Delight, Chapter 3.)
  return (n + 7) & static_cast<size_t>(-8);
}

using LifecycleIdAtomic = uint64_t;

// MetricsCollector collects stats for a particular arena.
class PROTOBUF_EXPORT ArenaMetricsCollector {
 public:
  ArenaMetricsCollector(bool record_allocs) : record_allocs_(record_allocs) {}

  // Invoked when the arena is about to be destroyed. This method will
  // typically finalize any metric collection and delete the collector.
  // space_allocated is the space used by the arena.
  virtual void OnDestroy(uint64_t space_allocated) = 0;

  // OnReset() is called when the associated arena is reset.
  // space_allocated is the space used by the arena just before the reset.
  virtual void OnReset(uint64_t space_allocated) = 0;

  // OnAlloc is called when an allocation happens.
  // type_info is promised to be static - its lifetime extends to
  // match program's lifetime (It is given by typeid operator).
  // Note: typeid(void) will be passed as allocated_type every time we
  // intentionally want to avoid monitoring an allocation. (i.e. internal
  // allocations for managing the arena)
  virtual void OnAlloc(const std::type_info* allocated_type,
                       uint64_t alloc_size) = 0;

  // Does OnAlloc() need to be called?  If false, metric collection overhead
  // will be reduced since we will not do extra work per allocation.
  bool RecordAllocs() { return record_allocs_; }

 protected:
  // This class is destructed by the call to OnDestroy().
  ~ArenaMetricsCollector() = default;
  const bool record_allocs_;
};

struct AllocationPolicy {
  static constexpr size_t kDefaultStartBlockSize = 256;
  static constexpr size_t kDefaultMaxBlockSize = 8192;

  size_t start_block_size = kDefaultStartBlockSize;
  size_t max_block_size = kDefaultMaxBlockSize;
  void* (*block_alloc)(size_t) = nullptr;
  void (*block_dealloc)(void*, size_t) = nullptr;
  ArenaMetricsCollector* metrics_collector = nullptr;

  bool IsDefault() const {
    return start_block_size == kDefaultMaxBlockSize &&
           max_block_size == kDefaultMaxBlockSize && block_alloc == nullptr &&
           block_dealloc == nullptr && metrics_collector == nullptr;
  }
};

// Tagged pointer to an AllocationPolicy.
class TaggedAllocationPolicyPtr {
 public:
  constexpr TaggedAllocationPolicyPtr() : policy_(0) {}

  explicit TaggedAllocationPolicyPtr(AllocationPolicy* policy)
      : policy_(reinterpret_cast<uintptr_t>(policy)) {}

  void set_policy(AllocationPolicy* policy) {
    auto bits = policy_ & kTagsMask;
    policy_ = reinterpret_cast<uintptr_t>(policy) | bits;
  }

  AllocationPolicy* get() {
    return reinterpret_cast<AllocationPolicy*>(policy_ & kPtrMask);
  }
  const AllocationPolicy* get() const {
    return reinterpret_cast<const AllocationPolicy*>(policy_ & kPtrMask);
  }

  AllocationPolicy& operator*() { return *get(); }
  const AllocationPolicy& operator*() const { return *get(); }

  AllocationPolicy* operator->() { return get(); }
  const AllocationPolicy* operator->() const { return get(); }

  bool is_user_owned_initial_block() const {
    return static_cast<bool>(get_mask<kUserOwnedInitialBlock>());
  }
  void set_is_user_owned_initial_block(bool v) {
    set_mask<kUserOwnedInitialBlock>(v);
  }

  bool should_record_allocs() const {
    return static_cast<bool>(get_mask<kRecordAllocs>());
  }
  void set_should_record_allocs(bool v) { set_mask<kRecordAllocs>(v); }

  uintptr_t get_raw() const { return policy_; }

  inline void RecordAlloc(const std::type_info* allocated_type,
                          size_t n) const {
    get()->metrics_collector->OnAlloc(allocated_type, n);
  }

 private:
  enum : uintptr_t {
    kUserOwnedInitialBlock = 1,
    kRecordAllocs = 2,
  };

  static constexpr uintptr_t kTagsMask = 7;
  static constexpr uintptr_t kPtrMask = ~kTagsMask;

  template <uintptr_t kMask>
  uintptr_t get_mask() const {
    return policy_ & kMask;
  }
  template <uintptr_t kMask>
  void set_mask(bool v) {
    if (v) {
      policy_ |= kMask;
    } else {
      policy_ &= ~kMask;
    }
  }
  uintptr_t policy_;
};

// A simple arena allocator. Calls to allocate functions must be properly
// serialized by the caller, hence this class cannot be used as a general
// purpose allocator in a multi-threaded program. It serves as a building block
// for ThreadSafeArena, which provides a thread-safe arena allocator.
//
// This class manages
// 1) Arena bump allocation + owning memory blocks.
// 2) Maintaining a cleanup list.
// It delagetes the actual memory allocation back to ThreadSafeArena, which
// contains the information on block growth policy and backing memory allocation
// used.
class PROTOBUF_EXPORT SerialArena {
 public:
  struct Memory {
    void* ptr;
    size_t size;
  };

  // Node contains the ptr of the object to be cleaned up and the associated
  // cleanup function ptr.
  struct CleanupNode {
    void* elem;              // Pointer to the object to be cleaned up.
    void (*cleanup)(void*);  // Function pointer to the destructor or deleter.
  };

  void CleanupList();
  uint64_t SpaceAllocated() const {
    return space_allocated_.load(std::memory_order_relaxed);
  }
  uint64_t SpaceUsed() const;

  bool HasSpace(size_t n) { return n <= static_cast<size_t>(limit_ - ptr_); }

  void* AllocateAligned(size_t n, const AllocationPolicy* policy) {
    GOOGLE_DCHECK_EQ(internal::AlignUpTo8(n), n);  // Must be already aligned.
    GOOGLE_DCHECK_GE(limit_, ptr_);
    if (PROTOBUF_PREDICT_FALSE(!HasSpace(n))) {
      return AllocateAlignedFallback(n, policy);
    }
    return AllocateFromExisting(n);
  }

 private:
  void* AllocateFromExisting(size_t n) {
    void* ret = ptr_;
    ptr_ += n;
#ifdef ADDRESS_SANITIZER
    ASAN_UNPOISON_MEMORY_REGION(ret, n);
#endif  // ADDRESS_SANITIZER
    return ret;
  }

 public:
  // Allocate space if the current region provides enough space.
  bool MaybeAllocateAligned(size_t n, void** out) {
    GOOGLE_DCHECK_EQ(internal::AlignUpTo8(n), n);  // Must be already aligned.
    GOOGLE_DCHECK_GE(limit_, ptr_);
    if (PROTOBUF_PREDICT_FALSE(!HasSpace(n))) return false;
    *out = AllocateFromExisting(n);
    return true;
  }

  std::pair<void*, CleanupNode*> AllocateAlignedWithCleanup(
      size_t n, const AllocationPolicy* policy) {
    GOOGLE_DCHECK_EQ(internal::AlignUpTo8(n), n);  // Must be already aligned.
    if (PROTOBUF_PREDICT_FALSE(!HasSpace(n + kCleanupSize))) {
      return AllocateAlignedWithCleanupFallback(n, policy);
    }
    return AllocateFromExistingWithCleanupFallback(n);
  }

 private:
  std::pair<void*, CleanupNode*> AllocateFromExistingWithCleanupFallback(
      size_t n) {
    void* ret = ptr_;
    ptr_ += n;
    limit_ -= kCleanupSize;
#ifdef ADDRESS_SANITIZER
    ASAN_UNPOISON_MEMORY_REGION(ret, n);
    ASAN_UNPOISON_MEMORY_REGION(limit_, kCleanupSize);
#endif  // ADDRESS_SANITIZER
    return CreatePair(ret, reinterpret_cast<CleanupNode*>(limit_));
  }

 public:
  void AddCleanup(void* elem, void (*cleanup)(void*),
                  const AllocationPolicy* policy) {
    auto res = AllocateAlignedWithCleanup(0, policy);
    res.second->elem = elem;
    res.second->cleanup = cleanup;
  }

  void* owner() const { return owner_; }
  SerialArena* next() const { return next_; }
  void set_next(SerialArena* next) { next_ = next; }

 private:
  friend class ThreadSafeArena;
  friend class ArenaBenchmark;

  // Creates a new SerialArena inside mem using the remaining memory as for
  // future allocations.
  static SerialArena* New(SerialArena::Memory mem, void* owner);
  // Free SerialArena returning the memory passed in to New
  template <typename Deallocator>
  Memory Free(Deallocator deallocator);

  // Blocks are variable length malloc-ed objects.  The following structure
  // describes the common header for all blocks.
  struct Block {
    Block(Block* next, size_t size) : next(next), size(size), start(nullptr) {}

    char* Pointer(size_t n) {
      GOOGLE_DCHECK(n <= size);
      return reinterpret_cast<char*>(this) + n;
    }

    Block* const next;
    const size_t size;
    CleanupNode* start;
    // data follows
  };

  void* owner_;            // &ThreadCache of this thread;
  Block* head_;            // Head of linked list of blocks.
  SerialArena* next_;      // Next SerialArena in this linked list.
  size_t space_used_ = 0;  // Necessary for metrics.
  std::atomic<size_t> space_allocated_;

  // Next pointer to allocate from.  Always 8-byte aligned.  Points inside
  // head_ (and head_->pos will always be non-canonical).  We keep these
  // here to reduce indirection.
  char* ptr_;
  char* limit_;

  // Constructor is private as only New() should be used.
  inline SerialArena(Block* b, void* owner);
  void* AllocateAlignedFallback(size_t n, const AllocationPolicy* policy);
  std::pair<void*, CleanupNode*> AllocateAlignedWithCleanupFallback(
      size_t n, const AllocationPolicy* policy);
  void AllocateNewBlock(size_t n, const AllocationPolicy* policy);

  std::pair<void*, CleanupNode*> CreatePair(void* ptr, CleanupNode* node) {
    return {ptr, node};
  }

 public:
  static constexpr size_t kBlockHeaderSize = AlignUpTo8(sizeof(Block));
  static constexpr size_t kCleanupSize = AlignUpTo8(sizeof(CleanupNode));
};

// Tag type used to invoke the constructor of message-owned arena.
// Only message-owned arenas use this constructor for creation.
// Such constructors are internal implementation details of the library.
struct MessageOwned {
  explicit MessageOwned() = default;
};

// This class provides the core Arena memory allocation library. Different
// implementations only need to implement the public interface below.
// Arena is not a template type as that would only be useful if all protos
// in turn would be templates, which will/cannot happen. However separating
// the memory allocation part from the cruft of the API users expect we can
// use #ifdef the select the best implementation based on hardware / OS.
class PROTOBUF_EXPORT ThreadSafeArena {
 public:
  ThreadSafeArena() { Init(); }

  // Constructor solely used by message-owned arena.
  ThreadSafeArena(internal::MessageOwned) : tag_and_id_(kMessageOwnedArena) {
    Init();
  }

  ThreadSafeArena(char* mem, size_t size) { InitializeFrom(mem, size); }

  explicit ThreadSafeArena(void* mem, size_t size,
                           const AllocationPolicy& policy) {
    InitializeWithPolicy(mem, size, policy);
  }

  // Destructor deletes all owned heap allocated objects, and destructs objects
  // that have non-trivial destructors, except for proto2 message objects whose
  // destructors can be skipped. Also, frees all blocks except the initial block
  // if it was passed in.
  ~ThreadSafeArena();

  uint64_t Reset();

  uint64_t SpaceAllocated() const;
  uint64_t SpaceUsed() const;

  void* AllocateAligned(size_t n, const std::type_info* type) {
    SerialArena* arena;
    if (PROTOBUF_PREDICT_TRUE(!alloc_policy_.should_record_allocs() &&
                              GetSerialArenaFast(&arena))) {
      return arena->AllocateAligned(n, AllocPolicy());
    } else {
      return AllocateAlignedFallback(n, type);
    }
  }

  // This function allocates n bytes if the common happy case is true and
  // returns true. Otherwise does nothing and returns false. This strange
  // semantics is necessary to allow callers to program functions that only
  // have fallback function calls in tail position. This substantially improves
  // code for the happy path.
  PROTOBUF_NDEBUG_INLINE bool MaybeAllocateAligned(size_t n, void** out) {
    SerialArena* a;
    if (PROTOBUF_PREDICT_TRUE(!alloc_policy_.should_record_allocs() &&
                              GetSerialArenaFromThreadCache(&a))) {
      return a->MaybeAllocateAligned(n, out);
    }
    return false;
  }

  std::pair<void*, SerialArena::CleanupNode*> AllocateAlignedWithCleanup(
      size_t n, const std::type_info* type);

  // Add object pointer and cleanup function pointer to the list.
  void AddCleanup(void* elem, void (*cleanup)(void*));

  // Checks whether this arena is message-owned.
  PROTOBUF_ALWAYS_INLINE bool IsMessageOwned() const {
    return tag_and_id_ & kMessageOwnedArena;
  }

 private:
  // Unique for each arena. Changes on Reset().
  uint64_t tag_and_id_ = 0;
  // The LSB of tag_and_id_ indicates if the arena is message-owned.
  enum : uint64_t { kMessageOwnedArena = 1 };

  TaggedAllocationPolicyPtr alloc_policy_;  // Tagged pointer to AllocPolicy.

  // Pointer to a linked list of SerialArena.
  std::atomic<SerialArena*> threads_;
  std::atomic<SerialArena*> hint_;  // Fast thread-local block access

  const AllocationPolicy* AllocPolicy() const { return alloc_policy_.get(); }
  void InitializeFrom(void* mem, size_t size);
  void InitializeWithPolicy(void* mem, size_t size, AllocationPolicy policy);
  void* AllocateAlignedFallback(size_t n, const std::type_info* type);
  std::pair<void*, SerialArena::CleanupNode*>
  AllocateAlignedWithCleanupFallback(size_t n, const std::type_info* type);

  void Init();
  void SetInitialBlock(void* mem, size_t size);

  // Delete or Destruct all objects owned by the arena.
  void CleanupList();

  inline uint64_t LifeCycleId() const {
    return tag_and_id_ & ~kMessageOwnedArena;
  }

  inline void CacheSerialArena(SerialArena* serial) {
    thread_cache().last_serial_arena = serial;
    thread_cache().last_lifecycle_id_seen = tag_and_id_;
    // TODO(haberman): evaluate whether we would gain efficiency by getting rid
    // of hint_.  It's the only write we do to ThreadSafeArena in the allocation
    // path, which will dirty the cache line.

    hint_.store(serial, std::memory_order_release);
  }

  PROTOBUF_NDEBUG_INLINE bool GetSerialArenaFast(SerialArena** arena) {
    if (GetSerialArenaFromThreadCache(arena)) return true;

    // Check whether we own the last accessed SerialArena on this arena.  This
    // fast path optimizes the case where a single thread uses multiple arenas.
    ThreadCache* tc = &thread_cache();
    SerialArena* serial = hint_.load(std::memory_order_acquire);
    if (PROTOBUF_PREDICT_TRUE(serial != NULL && serial->owner() == tc)) {
      *arena = serial;
      return true;
    }
    return false;
  }

  PROTOBUF_NDEBUG_INLINE bool GetSerialArenaFromThreadCache(
      SerialArena** arena) {
    // If this thread already owns a block in this arena then try to use that.
    // This fast path optimizes the case where multiple threads allocate from
    // the same arena.
    ThreadCache* tc = &thread_cache();
    if (PROTOBUF_PREDICT_TRUE(tc->last_lifecycle_id_seen == tag_and_id_)) {
      *arena = tc->last_serial_arena;
      return true;
    }
    return false;
  }
  SerialArena* GetSerialArenaFallback(void* me);

  template <typename Functor>
  void PerSerialArena(Functor fn) {
    // By omitting an Acquire barrier we ensure that any user code that doesn't
    // properly synchronize Reset() or the destructor will throw a TSAN warning.
    SerialArena* serial = threads_.load(std::memory_order_relaxed);

    for (; serial; serial = serial->next()) fn(serial);
  }

  // Releases all memory except the first block which it returns. The first
  // block might be owned by the user and thus need some extra checks before
  // deleting.
  SerialArena::Memory Free(size_t* space_allocated);

#ifdef _MSC_VER
#pragma warning(disable : 4324)
#endif
  struct alignas(64) ThreadCache {
#if defined(GOOGLE_PROTOBUF_NO_THREADLOCAL)
    // If we are using the ThreadLocalStorage class to store the ThreadCache,
    // then the ThreadCache's default constructor has to be responsible for
    // initializing it.
    ThreadCache()
        : next_lifecycle_id(0),
          last_lifecycle_id_seen(-1),
          last_serial_arena(NULL) {}
#endif

    // Number of per-thread lifecycle IDs to reserve. Must be power of two.
    // To reduce contention on a global atomic, each thread reserves a batch of
    // IDs.  The following number is calculated based on a stress test with
    // ~6500 threads all frequently allocating a new arena.
    static constexpr size_t kPerThreadIds = 256;
    // Next lifecycle ID available to this thread. We need to reserve a new
    // batch, if `next_lifecycle_id & (kPerThreadIds - 1) == 0`.
    uint64_t next_lifecycle_id;
    // The ThreadCache is considered valid as long as this matches the
    // lifecycle_id of the arena being used.
    uint64_t last_lifecycle_id_seen;
    SerialArena* last_serial_arena;
  };

  // Lifecycle_id can be highly contended variable in a situation of lots of
  // arena creation. Make sure that other global variables are not sharing the
  // cacheline.
#ifdef _MSC_VER
#pragma warning(disable : 4324)
#endif
  struct alignas(64) CacheAlignedLifecycleIdGenerator {
    std::atomic<LifecycleIdAtomic> id;
  };
  static CacheAlignedLifecycleIdGenerator lifecycle_id_generator_;
#if defined(GOOGLE_PROTOBUF_NO_THREADLOCAL)
  // iOS does not support __thread keyword so we use a custom thread local
  // storage class we implemented.
  static ThreadCache& thread_cache();
#elif defined(PROTOBUF_USE_DLLS)
  // Thread local variables cannot be exposed through DLL interface but we can
  // wrap them in static functions.
  static ThreadCache& thread_cache();
#else
  static PROTOBUF_THREAD_LOCAL ThreadCache thread_cache_;
  static ThreadCache& thread_cache() { return thread_cache_; }
#endif

  GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(ThreadSafeArena);
  // All protos have pointers back to the arena hence Arena must have
  // pointer stability.
  ThreadSafeArena(ThreadSafeArena&&) = delete;
  ThreadSafeArena& operator=(ThreadSafeArena&&) = delete;

 public:
  // kBlockHeaderSize is sizeof(Block), aligned up to the nearest multiple of 8
  // to protect the invariant that pos is always at a multiple of 8.
  static constexpr size_t kBlockHeaderSize = SerialArena::kBlockHeaderSize;
  static constexpr size_t kSerialArenaSize =
      (sizeof(SerialArena) + 7) & static_cast<size_t>(-8);
  static_assert(kBlockHeaderSize % 8 == 0,
                "kBlockHeaderSize must be a multiple of 8.");
  static_assert(kSerialArenaSize % 8 == 0,
                "kSerialArenaSize must be a multiple of 8.");
};

}  // namespace internal
}  // namespace protobuf
}  // namespace google

#include <port_undef.inc>

#endif  // GOOGLE_PROTOBUF_ARENA_IMPL_H__