bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright 2012 Google Inc. |
| 3 | * |
| 4 | * Use of this source code is governed by a BSD-style license that can be |
| 5 | * found in the LICENSE file. |
| 6 | */ |
| 7 | |
| 8 | #include "GrMemoryPool.h" |
| 9 | |
commit-bot@chromium.org | 515dcd3 | 2013-08-28 14:17:03 +0000 | [diff] [blame] | 10 | #ifdef SK_DEBUG |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 11 | #define VALIDATE this->validate() |
| 12 | #else |
| 13 | #define VALIDATE |
| 14 | #endif |
| 15 | |
| 16 | GrMemoryPool::GrMemoryPool(size_t preallocSize, size_t minAllocSize) { |
commit-bot@chromium.org | 1acc3d7 | 2013-09-06 23:13:05 +0000 | [diff] [blame] | 17 | SkDEBUGCODE(fAllocationCnt = 0); |
joshualitt | b7133be | 2015-04-08 09:08:31 -0700 | [diff] [blame] | 18 | SkDEBUGCODE(fAllocBlockCnt = 0); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 19 | |
commit-bot@chromium.org | 972f9cd | 2014-03-28 17:58:28 +0000 | [diff] [blame] | 20 | minAllocSize = SkTMax<size_t>(minAllocSize, 1 << 10); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 21 | fMinAllocSize = GrSizeAlignUp(minAllocSize + kPerAllocPad, kAlignment), |
| 22 | fPreallocSize = GrSizeAlignUp(preallocSize + kPerAllocPad, kAlignment); |
commit-bot@chromium.org | 972f9cd | 2014-03-28 17:58:28 +0000 | [diff] [blame] | 23 | fPreallocSize = SkTMax(fPreallocSize, fMinAllocSize); |
joshualitt | 22c6f5c | 2016-01-05 08:07:18 -0800 | [diff] [blame] | 24 | fSize = 0; |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 25 | |
| 26 | fHead = CreateBlock(fPreallocSize); |
| 27 | fTail = fHead; |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 28 | fHead->fNext = nullptr; |
| 29 | fHead->fPrev = nullptr; |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 30 | VALIDATE; |
| 31 | }; |
| 32 | |
| 33 | GrMemoryPool::~GrMemoryPool() { |
| 34 | VALIDATE; |
tfarina@chromium.org | f6de475 | 2013-08-17 00:02:59 +0000 | [diff] [blame] | 35 | SkASSERT(0 == fAllocationCnt); |
| 36 | SkASSERT(fHead == fTail); |
| 37 | SkASSERT(0 == fHead->fLiveCount); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 38 | DeleteBlock(fHead); |
| 39 | }; |
| 40 | |
| 41 | void* GrMemoryPool::allocate(size_t size) { |
| 42 | VALIDATE; |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 43 | size += kPerAllocPad; |
robertphillips | 19c6250 | 2016-01-06 07:04:46 -0800 | [diff] [blame] | 44 | size = GrSizeAlignUp(size, kAlignment); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 45 | if (fTail->fFreeSize < size) { |
robertphillips@google.com | adacc70 | 2013-10-14 21:53:24 +0000 | [diff] [blame] | 46 | size_t blockSize = size; |
commit-bot@chromium.org | 972f9cd | 2014-03-28 17:58:28 +0000 | [diff] [blame] | 47 | blockSize = SkTMax<size_t>(blockSize, fMinAllocSize); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 48 | BlockHeader* block = CreateBlock(blockSize); |
| 49 | |
| 50 | block->fPrev = fTail; |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 51 | block->fNext = nullptr; |
| 52 | SkASSERT(nullptr == fTail->fNext); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 53 | fTail->fNext = block; |
| 54 | fTail = block; |
joshualitt | b7133be | 2015-04-08 09:08:31 -0700 | [diff] [blame] | 55 | fSize += block->fSize; |
| 56 | SkDEBUGCODE(++fAllocBlockCnt); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 57 | } |
robertphillips | b7f4b8e | 2016-01-07 10:12:16 -0800 | [diff] [blame] | 58 | SkASSERT(kAssignedMarker == fTail->fBlockSentinal); |
tfarina@chromium.org | f6de475 | 2013-08-17 00:02:59 +0000 | [diff] [blame] | 59 | SkASSERT(fTail->fFreeSize >= size); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 60 | intptr_t ptr = fTail->fCurrPtr; |
| 61 | // We stash a pointer to the block header, just before the allocated space, |
| 62 | // so that we can decrement the live count on delete in constant time. |
robertphillips | 19c6250 | 2016-01-06 07:04:46 -0800 | [diff] [blame] | 63 | AllocHeader* allocData = reinterpret_cast<AllocHeader*>(ptr); |
| 64 | SkDEBUGCODE(allocData->fSentinal = kAssignedMarker); |
| 65 | allocData->fHeader = fTail; |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 66 | ptr += kPerAllocPad; |
tomhudson@google.com | dcba4c2 | 2012-07-24 21:36:16 +0000 | [diff] [blame] | 67 | fTail->fPrevPtr = fTail->fCurrPtr; |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 68 | fTail->fCurrPtr += size; |
| 69 | fTail->fFreeSize -= size; |
| 70 | fTail->fLiveCount += 1; |
joshualitt | b7133be | 2015-04-08 09:08:31 -0700 | [diff] [blame] | 71 | |
commit-bot@chromium.org | 1acc3d7 | 2013-09-06 23:13:05 +0000 | [diff] [blame] | 72 | SkDEBUGCODE(++fAllocationCnt); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 73 | VALIDATE; |
| 74 | return reinterpret_cast<void*>(ptr); |
| 75 | } |
| 76 | |
| 77 | void GrMemoryPool::release(void* p) { |
| 78 | VALIDATE; |
| 79 | intptr_t ptr = reinterpret_cast<intptr_t>(p) - kPerAllocPad; |
robertphillips | 19c6250 | 2016-01-06 07:04:46 -0800 | [diff] [blame] | 80 | AllocHeader* allocData = reinterpret_cast<AllocHeader*>(ptr); |
| 81 | SkASSERT(kAssignedMarker == allocData->fSentinal); |
| 82 | SkDEBUGCODE(allocData->fSentinal = kFreedMarker); |
| 83 | BlockHeader* block = allocData->fHeader; |
robertphillips | b7f4b8e | 2016-01-07 10:12:16 -0800 | [diff] [blame] | 84 | SkASSERT(kAssignedMarker == block->fBlockSentinal); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 85 | if (1 == block->fLiveCount) { |
| 86 | // the head block is special, it is reset rather than deleted |
| 87 | if (fHead == block) { |
joshualitt | b7133be | 2015-04-08 09:08:31 -0700 | [diff] [blame] | 88 | fHead->fCurrPtr = reinterpret_cast<intptr_t>(fHead) + kHeaderSize; |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 89 | fHead->fLiveCount = 0; |
| 90 | fHead->fFreeSize = fPreallocSize; |
| 91 | } else { |
| 92 | BlockHeader* prev = block->fPrev; |
| 93 | BlockHeader* next = block->fNext; |
tfarina@chromium.org | f6de475 | 2013-08-17 00:02:59 +0000 | [diff] [blame] | 94 | SkASSERT(prev); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 95 | prev->fNext = next; |
| 96 | if (next) { |
| 97 | next->fPrev = prev; |
| 98 | } else { |
tfarina@chromium.org | f6de475 | 2013-08-17 00:02:59 +0000 | [diff] [blame] | 99 | SkASSERT(fTail == block); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 100 | fTail = prev; |
| 101 | } |
joshualitt | b7133be | 2015-04-08 09:08:31 -0700 | [diff] [blame] | 102 | fSize -= block->fSize; |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 103 | DeleteBlock(block); |
joshualitt | b7133be | 2015-04-08 09:08:31 -0700 | [diff] [blame] | 104 | SkDEBUGCODE(fAllocBlockCnt--); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 105 | } |
| 106 | } else { |
| 107 | --block->fLiveCount; |
tomhudson@google.com | dcba4c2 | 2012-07-24 21:36:16 +0000 | [diff] [blame] | 108 | // Trivial reclaim: if we're releasing the most recent allocation, reuse it |
| 109 | if (block->fPrevPtr == ptr) { |
| 110 | block->fFreeSize += (block->fCurrPtr - block->fPrevPtr); |
| 111 | block->fCurrPtr = block->fPrevPtr; |
| 112 | } |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 113 | } |
commit-bot@chromium.org | 1acc3d7 | 2013-09-06 23:13:05 +0000 | [diff] [blame] | 114 | SkDEBUGCODE(--fAllocationCnt); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 115 | VALIDATE; |
| 116 | } |
| 117 | |
| 118 | GrMemoryPool::BlockHeader* GrMemoryPool::CreateBlock(size_t size) { |
joshualitt | b7133be | 2015-04-08 09:08:31 -0700 | [diff] [blame] | 119 | size_t paddedSize = size + kHeaderSize; |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 120 | BlockHeader* block = |
joshualitt | b7133be | 2015-04-08 09:08:31 -0700 | [diff] [blame] | 121 | reinterpret_cast<BlockHeader*>(sk_malloc_throw(paddedSize)); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 122 | // we assume malloc gives us aligned memory |
tfarina@chromium.org | f6de475 | 2013-08-17 00:02:59 +0000 | [diff] [blame] | 123 | SkASSERT(!(reinterpret_cast<intptr_t>(block) % kAlignment)); |
robertphillips | b7f4b8e | 2016-01-07 10:12:16 -0800 | [diff] [blame] | 124 | SkDEBUGCODE(block->fBlockSentinal = kAssignedMarker); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 125 | block->fLiveCount = 0; |
| 126 | block->fFreeSize = size; |
| 127 | block->fCurrPtr = reinterpret_cast<intptr_t>(block) + kHeaderSize; |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 128 | block->fPrevPtr = 0; // gcc warns on assigning nullptr to an intptr_t. |
joshualitt | b7133be | 2015-04-08 09:08:31 -0700 | [diff] [blame] | 129 | block->fSize = paddedSize; |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 130 | return block; |
| 131 | } |
| 132 | |
| 133 | void GrMemoryPool::DeleteBlock(BlockHeader* block) { |
robertphillips | b7f4b8e | 2016-01-07 10:12:16 -0800 | [diff] [blame] | 134 | SkASSERT(kAssignedMarker == block->fBlockSentinal); |
| 135 | SkDEBUGCODE(block->fBlockSentinal = kFreedMarker); // FWIW |
reed@google.com | 939ca7c | 2013-09-26 19:56:51 +0000 | [diff] [blame] | 136 | sk_free(block); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 137 | } |
| 138 | |
| 139 | void GrMemoryPool::validate() { |
humper@google.com | 0e51577 | 2013-01-07 19:54:40 +0000 | [diff] [blame] | 140 | #ifdef SK_DEBUG |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 141 | BlockHeader* block = fHead; |
halcanary | 96fcdcc | 2015-08-27 07:41:13 -0700 | [diff] [blame] | 142 | BlockHeader* prev = nullptr; |
tfarina@chromium.org | f6de475 | 2013-08-17 00:02:59 +0000 | [diff] [blame] | 143 | SkASSERT(block); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 144 | int allocCount = 0; |
| 145 | do { |
robertphillips | b7f4b8e | 2016-01-07 10:12:16 -0800 | [diff] [blame] | 146 | SkASSERT(kAssignedMarker == block->fBlockSentinal); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 147 | allocCount += block->fLiveCount; |
tfarina@chromium.org | f6de475 | 2013-08-17 00:02:59 +0000 | [diff] [blame] | 148 | SkASSERT(prev == block->fPrev); |
bsalomon | 49f085d | 2014-09-05 13:34:00 -0700 | [diff] [blame] | 149 | if (prev) { |
tfarina@chromium.org | f6de475 | 2013-08-17 00:02:59 +0000 | [diff] [blame] | 150 | SkASSERT(prev->fNext == block); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 151 | } |
| 152 | |
| 153 | intptr_t b = reinterpret_cast<intptr_t>(block); |
| 154 | size_t ptrOffset = block->fCurrPtr - b; |
| 155 | size_t totalSize = ptrOffset + block->fFreeSize; |
| 156 | size_t userSize = totalSize - kHeaderSize; |
| 157 | intptr_t userStart = b + kHeaderSize; |
| 158 | |
tfarina@chromium.org | f6de475 | 2013-08-17 00:02:59 +0000 | [diff] [blame] | 159 | SkASSERT(!(b % kAlignment)); |
| 160 | SkASSERT(!(totalSize % kAlignment)); |
| 161 | SkASSERT(!(userSize % kAlignment)); |
| 162 | SkASSERT(!(block->fCurrPtr % kAlignment)); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 163 | if (fHead != block) { |
tfarina@chromium.org | f6de475 | 2013-08-17 00:02:59 +0000 | [diff] [blame] | 164 | SkASSERT(block->fLiveCount); |
| 165 | SkASSERT(userSize >= fMinAllocSize); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 166 | } else { |
tfarina@chromium.org | f6de475 | 2013-08-17 00:02:59 +0000 | [diff] [blame] | 167 | SkASSERT(userSize == fPreallocSize); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 168 | } |
| 169 | if (!block->fLiveCount) { |
tfarina@chromium.org | f6de475 | 2013-08-17 00:02:59 +0000 | [diff] [blame] | 170 | SkASSERT(ptrOffset == kHeaderSize); |
| 171 | SkASSERT(userStart == block->fCurrPtr); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 172 | } else { |
robertphillips | 19c6250 | 2016-01-06 07:04:46 -0800 | [diff] [blame] | 173 | AllocHeader* allocData = reinterpret_cast<AllocHeader*>(userStart); |
| 174 | SkASSERT(allocData->fSentinal == kAssignedMarker || |
| 175 | allocData->fSentinal == kFreedMarker); |
| 176 | SkASSERT(block == allocData->fHeader); |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 177 | } |
robertphillips | 19c6250 | 2016-01-06 07:04:46 -0800 | [diff] [blame] | 178 | |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 179 | prev = block; |
| 180 | } while ((block = block->fNext)); |
tfarina@chromium.org | f6de475 | 2013-08-17 00:02:59 +0000 | [diff] [blame] | 181 | SkASSERT(allocCount == fAllocationCnt); |
| 182 | SkASSERT(prev == fTail); |
joshualitt | 22c6f5c | 2016-01-05 08:07:18 -0800 | [diff] [blame] | 183 | SkASSERT(fAllocBlockCnt != 0 || fSize == 0); |
humper@google.com | 0e51577 | 2013-01-07 19:54:40 +0000 | [diff] [blame] | 184 | #endif |
bsalomon@google.com | 4da34e3 | 2012-06-19 15:40:27 +0000 | [diff] [blame] | 185 | } |