1 //===-- memprof_mibmap.cpp -----------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file is a part of MemProfiler, a memory profiler. 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include "memprof_mibmap.h" 14 #include "profile/MemProfData.inc" 15 #include "sanitizer_common/sanitizer_allocator_internal.h" 16 #include "sanitizer_common/sanitizer_mutex.h" 17 18 namespace __memprof { 19 using ::llvm::memprof::MemInfoBlock; 20 InsertOrMerge(const uptr Id,const MemInfoBlock & Block,MIBMapTy & Map)21void InsertOrMerge(const uptr Id, const MemInfoBlock &Block, MIBMapTy &Map) { 22 MIBMapTy::Handle h(&Map, static_cast<uptr>(Id), /*remove=*/false, 23 /*create=*/true); 24 if (h.created()) { 25 LockedMemInfoBlock *lmib = 26 (LockedMemInfoBlock *)InternalAlloc(sizeof(LockedMemInfoBlock)); 27 lmib->mutex.Init(); 28 lmib->mib = Block; 29 *h = lmib; 30 } else { 31 LockedMemInfoBlock *lmib = *h; 32 SpinMutexLock lock(&lmib->mutex); 33 uintptr_t ShorterHistogram; 34 if (Block.AccessHistogramSize > lmib->mib.AccessHistogramSize) 35 ShorterHistogram = lmib->mib.AccessHistogram; 36 else 37 ShorterHistogram = Block.AccessHistogram; 38 39 lmib->mib.Merge(Block); 40 // The larger histogram is kept and the shorter histogram is discarded after 41 // adding the counters to the larger historam. Free only the shorter 42 // Histogram 43 if (Block.AccessHistogramSize > 0 || lmib->mib.AccessHistogramSize > 0) 44 InternalFree((void *)ShorterHistogram); 45 } 46 } 47 48 } // namespace __memprof 49