memory_test.cc
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1 // Copyright 2017 The Abseil Authors.
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14 
15 // Tests for pointer utilities.
16 
17 #include "absl/memory/memory.h"
18 
19 #include <sys/types.h>
20 #include <cstddef>
21 #include <memory>
22 #include <string>
23 #include <type_traits>
24 #include <utility>
25 #include <vector>
26 
27 #include "gmock/gmock.h"
28 #include "gtest/gtest.h"
29 
30 namespace {
31 
32 using ::testing::ElementsAre;
33 using ::testing::Return;
34 
35 // This class creates observable behavior to verify that a destructor has
36 // been called, via the instance_count variable.
37 class DestructorVerifier {
38  public:
39  DestructorVerifier() { ++instance_count_; }
40  DestructorVerifier(const DestructorVerifier&) = delete;
41  DestructorVerifier& operator=(const DestructorVerifier&) = delete;
42  ~DestructorVerifier() { --instance_count_; }
43 
44  // The number of instances of this class currently active.
45  static int instance_count() { return instance_count_; }
46 
47  private:
48  // The number of instances of this class currently active.
49  static int instance_count_;
50 };
51 
52 int DestructorVerifier::instance_count_ = 0;
53 
54 TEST(WrapUniqueTest, WrapUnique) {
55  // Test that the unique_ptr is constructed properly by verifying that the
56  // destructor for its payload gets called at the proper time.
57  {
58  auto dv = new DestructorVerifier;
59  EXPECT_EQ(1, DestructorVerifier::instance_count());
60  std::unique_ptr<DestructorVerifier> ptr = absl::WrapUnique(dv);
61  EXPECT_EQ(1, DestructorVerifier::instance_count());
62  }
63  EXPECT_EQ(0, DestructorVerifier::instance_count());
64 }
65 TEST(MakeUniqueTest, Basic) {
66  std::unique_ptr<std::string> p = absl::make_unique<std::string>();
67  EXPECT_EQ("", *p);
68  p = absl::make_unique<std::string>("hi");
69  EXPECT_EQ("hi", *p);
70 }
71 
72 // InitializationVerifier fills in a pattern when allocated so we can
73 // distinguish between its default and value initialized states (without
74 // accessing truly uninitialized memory).
75 struct InitializationVerifier {
76  static constexpr int kDefaultScalar = 0x43;
77  static constexpr int kDefaultArray = 0x4B;
78 
79  static void* operator new(size_t n) {
80  void* ret = ::operator new(n);
81  memset(ret, kDefaultScalar, n);
82  return ret;
83  }
84 
85  static void* operator new[](size_t n) {
86  void* ret = ::operator new[](n);
87  memset(ret, kDefaultArray, n);
88  return ret;
89  }
90 
91  int a;
92  int b;
93 };
94 
95 TEST(Initialization, MakeUnique) {
96  auto p = absl::make_unique<InitializationVerifier>();
97 
98  EXPECT_EQ(0, p->a);
99  EXPECT_EQ(0, p->b);
100 }
101 
102 TEST(Initialization, MakeUniqueArray) {
103  auto p = absl::make_unique<InitializationVerifier[]>(2);
104 
105  EXPECT_EQ(0, p[0].a);
106  EXPECT_EQ(0, p[0].b);
107  EXPECT_EQ(0, p[1].a);
108  EXPECT_EQ(0, p[1].b);
109 }
110 
111 struct MoveOnly {
112  MoveOnly() = default;
113  explicit MoveOnly(int i1) : ip1{new int{i1}} {}
114  MoveOnly(int i1, int i2) : ip1{new int{i1}}, ip2{new int{i2}} {}
115  std::unique_ptr<int> ip1;
116  std::unique_ptr<int> ip2;
117 };
118 
119 struct AcceptMoveOnly {
120  explicit AcceptMoveOnly(MoveOnly m) : m_(std::move(m)) {}
121  MoveOnly m_;
122 };
123 
124 TEST(MakeUniqueTest, MoveOnlyTypeAndValue) {
125  using ExpectedType = std::unique_ptr<MoveOnly>;
126  {
127  auto p = absl::make_unique<MoveOnly>();
128  static_assert(std::is_same<decltype(p), ExpectedType>::value,
129  "unexpected return type");
130  EXPECT_TRUE(!p->ip1);
131  EXPECT_TRUE(!p->ip2);
132  }
133  {
134  auto p = absl::make_unique<MoveOnly>(1);
135  static_assert(std::is_same<decltype(p), ExpectedType>::value,
136  "unexpected return type");
137  EXPECT_TRUE(p->ip1 && *p->ip1 == 1);
138  EXPECT_TRUE(!p->ip2);
139  }
140  {
141  auto p = absl::make_unique<MoveOnly>(1, 2);
142  static_assert(std::is_same<decltype(p), ExpectedType>::value,
143  "unexpected return type");
144  EXPECT_TRUE(p->ip1 && *p->ip1 == 1);
145  EXPECT_TRUE(p->ip2 && *p->ip2 == 2);
146  }
147 }
148 
149 TEST(MakeUniqueTest, AcceptMoveOnly) {
150  auto p = absl::make_unique<AcceptMoveOnly>(MoveOnly());
151  p = std::unique_ptr<AcceptMoveOnly>(new AcceptMoveOnly(MoveOnly()));
152 }
153 
154 struct ArrayWatch {
155  void* operator new[](size_t n) {
156  allocs().push_back(n);
157  return ::operator new[](n);
158  }
159  void operator delete[](void* p) {
160  return ::operator delete[](p);
161  }
162  static std::vector<size_t>& allocs() {
163  static auto& v = *new std::vector<size_t>;
164  return v;
165  }
166 };
167 
168 TEST(Make_UniqueTest, Array) {
169  // Ensure state is clean before we start so that these tests
170  // are order-agnostic.
171  ArrayWatch::allocs().clear();
172 
173  auto p = absl::make_unique<ArrayWatch[]>(5);
174  static_assert(std::is_same<decltype(p),
175  std::unique_ptr<ArrayWatch[]>>::value,
176  "unexpected return type");
177  EXPECT_THAT(ArrayWatch::allocs(), ElementsAre(5 * sizeof(ArrayWatch)));
178 }
179 
180 TEST(Make_UniqueTest, NotAmbiguousWithStdMakeUnique) {
181  // Ensure that absl::make_unique is not ambiguous with std::make_unique.
182  // In C++14 mode, the below call to make_unique has both types as candidates.
183  struct TakesStdType {
184  explicit TakesStdType(const std::vector<int> &vec) {}
185  };
186  using absl::make_unique;
187  (void)make_unique<TakesStdType>(std::vector<int>());
188 }
189 
190 #if 0
191 // These tests shouldn't compile.
192 TEST(MakeUniqueTestNC, AcceptMoveOnlyLvalue) {
193  auto m = MoveOnly();
194  auto p = absl::make_unique<AcceptMoveOnly>(m);
195 }
196 TEST(MakeUniqueTestNC, KnownBoundArray) {
197  auto p = absl::make_unique<ArrayWatch[5]>();
198 }
199 #endif
200 
201 TEST(RawPtrTest, RawPointer) {
202  int i = 5;
203  EXPECT_EQ(&i, absl::RawPtr(&i));
204 }
205 
206 TEST(RawPtrTest, SmartPointer) {
207  int* o = new int(5);
208  std::unique_ptr<int> p(o);
209  EXPECT_EQ(o, absl::RawPtr(p));
210 }
211 
212 class IntPointerNonConstDeref {
213  public:
214  explicit IntPointerNonConstDeref(int* p) : p_(p) {}
215  friend bool operator!=(const IntPointerNonConstDeref& a, std::nullptr_t) {
216  return a.p_ != nullptr;
217  }
218  int& operator*() { return *p_; }
219 
220  private:
221  std::unique_ptr<int> p_;
222 };
223 
224 TEST(RawPtrTest, SmartPointerNonConstDereference) {
225  int* o = new int(5);
226  IntPointerNonConstDeref p(o);
227  EXPECT_EQ(o, absl::RawPtr(p));
228 }
229 
230 TEST(RawPtrTest, NullValuedRawPointer) {
231  int* p = nullptr;
232  EXPECT_EQ(nullptr, absl::RawPtr(p));
233 }
234 
235 TEST(RawPtrTest, NullValuedSmartPointer) {
236  std::unique_ptr<int> p;
237  EXPECT_EQ(nullptr, absl::RawPtr(p));
238 }
239 
240 TEST(RawPtrTest, Nullptr) {
241  auto p = absl::RawPtr(nullptr);
242  EXPECT_TRUE((std::is_same<std::nullptr_t, decltype(p)>::value));
243  EXPECT_EQ(nullptr, p);
244 }
245 
246 TEST(RawPtrTest, Null) {
247  auto p = absl::RawPtr(nullptr);
248  EXPECT_TRUE((std::is_same<std::nullptr_t, decltype(p)>::value));
249  EXPECT_EQ(nullptr, p);
250 }
251 
252 TEST(RawPtrTest, Zero) {
253  auto p = absl::RawPtr(nullptr);
254  EXPECT_TRUE((std::is_same<std::nullptr_t, decltype(p)>::value));
255  EXPECT_EQ(nullptr, p);
256 }
257 
258 TEST(ShareUniquePtrTest, Share) {
259  auto up = absl::make_unique<int>();
260  int* rp = up.get();
261  auto sp = absl::ShareUniquePtr(std::move(up));
262  EXPECT_EQ(sp.get(), rp);
263 }
264 
265 TEST(ShareUniquePtrTest, ShareNull) {
266  struct NeverDie {
267  using pointer = void*;
268  void operator()(pointer) {
269  ASSERT_TRUE(false) << "Deleter should not have been called.";
270  }
271  };
272 
273  std::unique_ptr<void, NeverDie> up;
274  auto sp = absl::ShareUniquePtr(std::move(up));
275 }
276 
277 TEST(WeakenPtrTest, Weak) {
278  auto sp = std::make_shared<int>();
279  auto wp = absl::WeakenPtr(sp);
280  EXPECT_EQ(sp.get(), wp.lock().get());
281  sp.reset();
282  EXPECT_TRUE(wp.expired());
283 }
284 
285 // Should not compile.
286 /*
287 TEST(RawPtrTest, NotAPointer) {
288  absl::RawPtr(1.5);
289 }
290 */
291 
292 template <typename T>
293 struct SmartPointer {
294  using difference_type = char;
295 };
296 
297 struct PointerWith {
298  using element_type = int32_t;
299  using difference_type = int16_t;
300  template <typename U>
301  using rebind = SmartPointer<U>;
302 
303  static PointerWith pointer_to(
304  element_type& r) { // NOLINT(runtime/references)
305  return PointerWith{&r};
306  }
307 
308  element_type* ptr;
309 };
310 
311 template <typename... Args>
312 struct PointerWithout {};
313 
314 TEST(PointerTraits, Types) {
315  using TraitsWith = absl::pointer_traits<PointerWith>;
319  EXPECT_TRUE((
320  std::is_same<TraitsWith::rebind<int64_t>, SmartPointer<int64_t>>::value));
321 
323  EXPECT_TRUE((std::is_same<TraitsWithout::pointer,
324  PointerWithout<double, int>>::value));
326  EXPECT_TRUE(
328  EXPECT_TRUE((std::is_same<TraitsWithout::rebind<int64_t>,
329  PointerWithout<int64_t, int>>::value));
330 
331  using TraitsRawPtr = absl::pointer_traits<char*>;
334  EXPECT_TRUE(
336  EXPECT_TRUE((std::is_same<TraitsRawPtr::rebind<int64_t>, int64_t*>::value));
337 }
338 
339 TEST(PointerTraits, Functions) {
340  int i;
341  EXPECT_EQ(&i, absl::pointer_traits<PointerWith>::pointer_to(i).ptr);
342  EXPECT_EQ(&i, absl::pointer_traits<int*>::pointer_to(i));
343 }
344 
345 TEST(AllocatorTraits, Typedefs) {
346  struct A {
347  struct value_type {};
348  };
349  EXPECT_TRUE((
350  std::is_same<A,
352  EXPECT_TRUE(
353  (std::is_same<A::value_type,
355 
356  struct X {};
357  struct HasPointer {
358  using value_type = X;
359  using pointer = SmartPointer<X>;
360  };
361  EXPECT_TRUE((std::is_same<SmartPointer<X>, typename absl::allocator_traits<
362  HasPointer>::pointer>::value));
363  EXPECT_TRUE(
364  (std::is_same<A::value_type*,
366 
367  EXPECT_TRUE(
368  (std::is_same<
369  SmartPointer<const X>,
371  EXPECT_TRUE(
372  (std::is_same<const A::value_type*,
374 
375  struct HasVoidPointer {
376  using value_type = X;
377  struct void_pointer {};
378  };
379 
380  EXPECT_TRUE((std::is_same<HasVoidPointer::void_pointer,
381  typename absl::allocator_traits<
382  HasVoidPointer>::void_pointer>::value));
383  EXPECT_TRUE(
384  (std::is_same<SmartPointer<void>, typename absl::allocator_traits<
385  HasPointer>::void_pointer>::value));
386 
387  struct HasConstVoidPointer {
388  using value_type = X;
389  struct const_void_pointer {};
390  };
391 
392  EXPECT_TRUE(
393  (std::is_same<HasConstVoidPointer::const_void_pointer,
394  typename absl::allocator_traits<
395  HasConstVoidPointer>::const_void_pointer>::value));
396  EXPECT_TRUE((std::is_same<SmartPointer<const void>,
397  typename absl::allocator_traits<
398  HasPointer>::const_void_pointer>::value));
399 
400  struct HasDifferenceType {
401  using value_type = X;
402  using difference_type = int;
403  };
404  EXPECT_TRUE(
405  (std::is_same<int, typename absl::allocator_traits<
406  HasDifferenceType>::difference_type>::value));
407  EXPECT_TRUE((std::is_same<char, typename absl::allocator_traits<
408  HasPointer>::difference_type>::value));
409 
410  struct HasSizeType {
411  using value_type = X;
412  using size_type = unsigned int;
413  };
414  EXPECT_TRUE((std::is_same<unsigned int, typename absl::allocator_traits<
415  HasSizeType>::size_type>::value));
416  EXPECT_TRUE((std::is_same<unsigned char, typename absl::allocator_traits<
417  HasPointer>::size_type>::value));
418 
419  struct HasPropagateOnCopy {
420  using value_type = X;
421  struct propagate_on_container_copy_assignment {};
422  };
423 
424  EXPECT_TRUE(
425  (std::is_same<HasPropagateOnCopy::propagate_on_container_copy_assignment,
427  propagate_on_container_copy_assignment>::value));
428  EXPECT_TRUE(
429  (std::is_same<std::false_type,
430  typename absl::allocator_traits<
431  A>::propagate_on_container_copy_assignment>::value));
432 
433  struct HasPropagateOnMove {
434  using value_type = X;
435  struct propagate_on_container_move_assignment {};
436  };
437 
438  EXPECT_TRUE(
439  (std::is_same<HasPropagateOnMove::propagate_on_container_move_assignment,
441  propagate_on_container_move_assignment>::value));
442  EXPECT_TRUE(
443  (std::is_same<std::false_type,
444  typename absl::allocator_traits<
445  A>::propagate_on_container_move_assignment>::value));
446 
447  struct HasPropagateOnSwap {
448  using value_type = X;
449  struct propagate_on_container_swap {};
450  };
451 
452  EXPECT_TRUE(
453  (std::is_same<HasPropagateOnSwap::propagate_on_container_swap,
455  propagate_on_container_swap>::value));
456  EXPECT_TRUE(
457  (std::is_same<std::false_type, typename absl::allocator_traits<A>::
458  propagate_on_container_swap>::value));
459 
460  struct HasIsAlwaysEqual {
461  using value_type = X;
462  struct is_always_equal {};
463  };
464 
465  EXPECT_TRUE((std::is_same<HasIsAlwaysEqual::is_always_equal,
466  typename absl::allocator_traits<
467  HasIsAlwaysEqual>::is_always_equal>::value));
468  EXPECT_TRUE((std::is_same<std::true_type, typename absl::allocator_traits<
469  A>::is_always_equal>::value));
470  struct NonEmpty {
471  using value_type = X;
472  int i;
473  };
474  EXPECT_TRUE(
475  (std::is_same<std::false_type,
477 }
478 
479 template <typename T>
480 struct AllocWithPrivateInheritance : private std::allocator<T> {
481  using value_type = T;
482 };
483 
484 TEST(AllocatorTraits, RebindWithPrivateInheritance) {
485  // Regression test for some versions of gcc that do not like the sfinae we
486  // used in combination with private inheritance.
487  EXPECT_TRUE(
488  (std::is_same<AllocWithPrivateInheritance<int>,
489  absl::allocator_traits<AllocWithPrivateInheritance<char>>::
490  rebind_alloc<int>>::value));
491 }
492 
493 template <typename T>
494 struct Rebound {};
495 
496 struct AllocWithRebind {
497  using value_type = int;
498  template <typename T>
499  struct rebind {
500  using other = Rebound<T>;
501  };
502 };
503 
504 template <typename T, typename U>
505 struct AllocWithoutRebind {
506  using value_type = int;
507 };
508 
509 TEST(AllocatorTraits, Rebind) {
510  EXPECT_TRUE(
511  (std::is_same<Rebound<int>,
512  typename absl::allocator_traits<
513  AllocWithRebind>::template rebind_alloc<int>>::value));
514  EXPECT_TRUE(
515  (std::is_same<absl::allocator_traits<Rebound<int>>,
516  typename absl::allocator_traits<
517  AllocWithRebind>::template rebind_traits<int>>::value));
518 
519  EXPECT_TRUE(
520  (std::is_same<AllocWithoutRebind<double, char>,
521  typename absl::allocator_traits<AllocWithoutRebind<
522  int, char>>::template rebind_alloc<double>>::value));
523  EXPECT_TRUE(
524  (std::is_same<absl::allocator_traits<AllocWithoutRebind<double, char>>,
525  typename absl::allocator_traits<AllocWithoutRebind<
526  int, char>>::template rebind_traits<double>>::value));
527 }
528 
529 struct TestValue {
530  TestValue() {}
531  explicit TestValue(int* trace) : trace(trace) { ++*trace; }
532  ~TestValue() {
533  if (trace) --*trace;
534  }
535  int* trace = nullptr;
536 };
537 
538 struct MinimalMockAllocator {
539  MinimalMockAllocator() : value(0) {}
540  explicit MinimalMockAllocator(int value) : value(value) {}
541  MinimalMockAllocator(const MinimalMockAllocator& other)
542  : value(other.value) {}
543  using value_type = TestValue;
544  MOCK_METHOD1(allocate, value_type*(size_t));
545  MOCK_METHOD2(deallocate, void(value_type*, size_t));
546 
547  int value;
548 };
549 
550 TEST(AllocatorTraits, FunctionsMinimal) {
551  int trace = 0;
552  int hint;
553  TestValue x(&trace);
554  MinimalMockAllocator mock;
556  EXPECT_CALL(mock, allocate(7)).WillRepeatedly(Return(&x));
557  EXPECT_CALL(mock, deallocate(&x, 7));
558 
559  EXPECT_EQ(&x, Traits::allocate(mock, 7));
560  Traits::allocate(mock, 7, static_cast<const void*>(&hint));
561  EXPECT_EQ(&x, Traits::allocate(mock, 7, static_cast<const void*>(&hint)));
562  Traits::deallocate(mock, &x, 7);
563 
564  EXPECT_EQ(1, trace);
565  Traits::construct(mock, &x, &trace);
566  EXPECT_EQ(2, trace);
567  Traits::destroy(mock, &x);
568  EXPECT_EQ(1, trace);
569 
570  EXPECT_EQ(std::numeric_limits<size_t>::max() / sizeof(TestValue),
571  Traits::max_size(mock));
572 
573  EXPECT_EQ(0, mock.value);
574  EXPECT_EQ(0, Traits::select_on_container_copy_construction(mock).value);
575 }
576 
577 struct FullMockAllocator {
578  FullMockAllocator() : value(0) {}
579  explicit FullMockAllocator(int value) : value(value) {}
580  FullMockAllocator(const FullMockAllocator& other) : value(other.value) {}
581  using value_type = TestValue;
582  MOCK_METHOD1(allocate, value_type*(size_t));
583  MOCK_METHOD2(allocate, value_type*(size_t, const void*));
584  MOCK_METHOD2(construct, void(value_type*, int*));
585  MOCK_METHOD1(destroy, void(value_type*));
586  MOCK_CONST_METHOD0(max_size, size_t());
587  MOCK_CONST_METHOD0(select_on_container_copy_construction,
588  FullMockAllocator());
589 
590  int value;
591 };
592 
593 TEST(AllocatorTraits, FunctionsFull) {
594  int trace = 0;
595  int hint;
596  TestValue x(&trace), y;
597  FullMockAllocator mock;
599  EXPECT_CALL(mock, allocate(7)).WillRepeatedly(Return(&x));
600  EXPECT_CALL(mock, allocate(13, &hint)).WillRepeatedly(Return(&y));
601  EXPECT_CALL(mock, construct(&x, &trace));
602  EXPECT_CALL(mock, destroy(&x));
603  EXPECT_CALL(mock, max_size()).WillRepeatedly(Return(17));
604  EXPECT_CALL(mock, select_on_container_copy_construction())
605  .WillRepeatedly(Return(FullMockAllocator(23)));
606 
607  EXPECT_EQ(&x, Traits::allocate(mock, 7));
608  EXPECT_EQ(&y, Traits::allocate(mock, 13, static_cast<const void*>(&hint)));
609 
610  EXPECT_EQ(1, trace);
611  Traits::construct(mock, &x, &trace);
612  EXPECT_EQ(1, trace);
613  Traits::destroy(mock, &x);
614  EXPECT_EQ(1, trace);
615 
616  EXPECT_EQ(17, Traits::max_size(mock));
617 
618  EXPECT_EQ(0, mock.value);
619  EXPECT_EQ(23, Traits::select_on_container_copy_construction(mock).value);
620 }
621 
622 TEST(AllocatorNoThrowTest, DefaultAllocator) {
623 #if defined(ABSL_ALLOCATOR_NOTHROW) && ABSL_ALLOCATOR_NOTHROW
625 #else
627 #endif
628 }
629 
630 TEST(AllocatorNoThrowTest, StdAllocator) {
631 #if defined(ABSL_ALLOCATOR_NOTHROW) && ABSL_ALLOCATOR_NOTHROW
632  EXPECT_TRUE(absl::allocator_is_nothrow<std::allocator<int>>::value);
633 #else
634  EXPECT_FALSE(absl::allocator_is_nothrow<std::allocator<int>>::value);
635 #endif
636 }
637 
638 TEST(AllocatorNoThrowTest, CustomAllocator) {
639  struct NoThrowAllocator {
640  using is_nothrow = std::true_type;
641  };
642  struct CanThrowAllocator {
643  using is_nothrow = std::false_type;
644  };
645  struct UnspecifiedAllocator {
646  };
650 }
651 
652 } // namespace
int v
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Definition: memory.h:71
#define X(c)
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Definition: memory.h:432
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Definition: memory.h:195
static std::function< void(void *, Slot *, Slot)> construct
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UnboundConversion o
Definition: parser_test.cc:86
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Definition: memory.h:440
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Definition: memory.h:245
TEST(Symbolize, Unimplemented)
memory_internal::MakeUniqueResult< T >::scalar make_unique(Args &&...args)
Definition: memory.h:166
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autogenerated on Wed Jun 19 2019 19:19:57