-
Notifications
You must be signed in to change notification settings - Fork 1k
/
MemoryTesting.cpp
235 lines (188 loc) · 7.07 KB
/
MemoryTesting.cpp
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
/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#include <aws/testing/MemoryTesting.h>
#include <aws/external/gtest.h>
#include <aws/core/utils/UnreferencedParam.h>
#include <chrono>
#include <thread>
#include <cstdlib>
#include <cstddef>
#if defined(_MSC_VER) && _MSC_VER < 1900
#define alignof __alignof
#endif
namespace {
#if defined(__GNUC__) && __GNUC__ == 4 && __GNUC_MINOR__ <= 8 && !defined(__clang__)
// GCC 4.8 has `max_align_t` defined in global namespace
using ::max_align_t;
#else
using std::max_align_t;
#endif
}
BaseTestMemorySystem::BaseTestMemorySystem() :
m_currentBytesAllocated(0),
m_maxBytesAllocated(0),
m_totalBytesAllocated(0),
m_currentOutstandingAllocations(0),
m_maxOutstandingAllocations(0),
m_totalAllocations(0)
{
}
void* BaseTestMemorySystem::AllocateMemory(std::size_t blockSize, std::size_t alignment, const char *allocationTag)
{
AWS_UNREFERENCED_PARAM(alignment);
AWS_UNREFERENCED_PARAM(allocationTag);
++m_currentOutstandingAllocations;
m_maxOutstandingAllocations = (std::max)(m_maxOutstandingAllocations, m_currentOutstandingAllocations);
++m_totalAllocations;
m_currentBytesAllocated += blockSize;
m_maxBytesAllocated = (std::max)(m_maxBytesAllocated, m_currentBytesAllocated);
m_totalBytesAllocated += blockSize;
// Note: malloc will always return an address aligned with alignof(std::max_align_t);
// This alignment value is not always equals to sizeof(std::size_t). But one thing we can make sure is that
// alignof(std::max_align_t) is always multiple of sizeof(std::size_t).
// On some platforms, in place construction requires memory address must be aligned with alignof(std::max_align_t).
// E.g on Mac, x86_64, sizeof(std::size_t) equals 8. but alignof(std::max_align_t) equals 16. std::function requires aligned memory address.
// To record the malloc size and keep returned address align with 16, instead of malloc extra 8 bytes,
// we end up with malloc extra 16 bytes.
char* rawMemory = reinterpret_cast<char*>(malloc(blockSize + alignof(max_align_t)));
std::size_t *pointerToSize = reinterpret_cast<std::size_t*>(reinterpret_cast<void*>(rawMemory));
*pointerToSize = blockSize;
return reinterpret_cast<void*>(rawMemory + alignof(max_align_t));
}
void BaseTestMemorySystem::FreeMemory(void* memoryPtr)
{
ASSERT_NE(m_currentOutstandingAllocations, 0ULL);
if(m_currentOutstandingAllocations > 0)
{
--m_currentOutstandingAllocations;
}
std::size_t *pointerToSize = reinterpret_cast<std::size_t*>(reinterpret_cast<char*>(memoryPtr) - alignof(max_align_t));
std::size_t blockSize = *pointerToSize;
ASSERT_GE(m_currentBytesAllocated, blockSize);
if(m_currentBytesAllocated >= blockSize)
{
m_currentBytesAllocated -= blockSize;
}
free(reinterpret_cast<void*>(pointerToSize));
}
////////////////////////////////////////////////////////////////////////////////////////////////////////////
ExactTestMemorySystem::ExactTestMemorySystem(uint32_t bucketCount, uint32_t trackersPerBlock) :
Base(),
m_bucketCount(bucketCount),
m_trackersPerBlock(trackersPerBlock),
m_blocks(nullptr),
m_freePool(nullptr),
m_buckets(nullptr),
m_internalSync()
{
m_buckets = reinterpret_cast<TaggedMemoryTracker**>(malloc(bucketCount * sizeof(TaggedMemoryTracker*)));
for(uint32_t i = 0; i < bucketCount; ++i)
{
m_buckets[i] = nullptr;
}
}
ExactTestMemorySystem::~ExactTestMemorySystem()
{
Cleanup();
}
void ExactTestMemorySystem::Cleanup()
{
// free all elements in the m_blocks linked list
while(m_blocks != nullptr)
{
RawBlock* block = m_blocks;
m_blocks = m_blocks->m_next;
free(block);
}
free(m_buckets);
}
void ExactTestMemorySystem::GrowFreePool()
{
// malloc enough memory to hold the linked list pointer as well as the desired number of TaggedMemoryTrackers
RawBlock* block = reinterpret_cast<RawBlock*>(malloc(m_trackersPerBlock * sizeof(TaggedMemoryTracker) + sizeof(RawBlock*)));
block->m_next = m_blocks;
m_blocks = block;
// for each embedded TaggedMemoryTracker, initialize it and push it onto the free pool list
TaggedMemoryTracker* tracker = reinterpret_cast<TaggedMemoryTracker*>(reinterpret_cast<char *>(block) + sizeof(RawBlock*));
for(uint32_t i = 0; i < m_trackersPerBlock; ++i)
{
tracker->m_next = m_freePool;
tracker->m_tag = nullptr;
tracker->m_memory = nullptr;
tracker->m_size = 0;
m_freePool = tracker;
++tracker;
}
}
// takes a memory address and returns a hash bucket index
uint32_t ExactTestMemorySystem::CalculateBucketIndex(const void* memory) const
{
uint64_t address = reinterpret_cast<uint64_t>(memory);
address /= (sizeof(void *)); // it's likely that the returns from malloc are aligned via pointer-size, so let's divide that out to get better distribution
return address % m_bucketCount;
}
ExactTestMemorySystem::TaggedMemoryTracker* ExactTestMemorySystem::AllocateTracker()
{
if(m_freePool == nullptr)
{
GrowFreePool();
}
TaggedMemoryTracker* tracker = m_freePool;
m_freePool = m_freePool->m_next;
return tracker;
}
void* ExactTestMemorySystem::AllocateMemory(std::size_t blockSize, std::size_t alignment, const char *allocationTag)
{
std::lock_guard<std::mutex> lock(m_internalSync);
void* rawMemory = Base::AllocateMemory(blockSize, alignment, allocationTag);
uint32_t bucketIndex = CalculateBucketIndex(rawMemory);
TaggedMemoryTracker* tracker = AllocateTracker();
tracker->m_next = m_buckets[bucketIndex];
tracker->m_memory = rawMemory;
tracker->m_tag = allocationTag;
tracker->m_size = blockSize;
m_buckets[bucketIndex] = tracker;
return rawMemory;
}
void ExactTestMemorySystem::FreeMemory(void* memoryPtr)
{
std::lock_guard<std::mutex> lock(m_internalSync);
uint32_t bucketIndex = CalculateBucketIndex(memoryPtr);
bool foundMemory = false;
TaggedMemoryTracker** prevPtr = &m_buckets[bucketIndex];
TaggedMemoryTracker* currentTracker = m_buckets[bucketIndex];
while(currentTracker != nullptr)
{
if(currentTracker->m_memory == memoryPtr)
{
// we found its TaggedMemoryTracker, splice it out of the list and return it to the free pool
*prevPtr = currentTracker->m_next;
currentTracker->m_next = m_freePool;
m_freePool = currentTracker;
foundMemory = true;
break;
}
prevPtr = &(currentTracker->m_next);
currentTracker = currentTracker->m_next;
}
if(!foundMemory)
{
// we have no record of this, that's bad, let's not free it
return;
}
Base::FreeMemory(memoryPtr);
}
// true iff all allocations have been freed
bool ExactTestMemorySystem::IsClean() const
{
for(uint32_t i = 0; i < m_bucketCount; ++i)
{
if(m_buckets[i] != nullptr)
{
return false;
}
}
return true;
}