1 //===-- asan_memory_profile.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 AddressSanitizer, an address sanity checker. 10 // 11 // This file implements __sanitizer_print_memory_profile. 12 //===----------------------------------------------------------------------===// 13 14 #include "asan/asan_allocator.h" 15 #include "lsan/lsan_common.h" 16 #include "sanitizer_common/sanitizer_common.h" 17 #include "sanitizer_common/sanitizer_stackdepot.h" 18 #include "sanitizer_common/sanitizer_stacktrace.h" 19 20 #if CAN_SANITIZE_LEAKS 21 22 namespace __asan { 23 24 struct AllocationSite { 25 u32 id; 26 uptr total_size; 27 uptr count; 28 }; 29 30 class HeapProfile { 31 public: 32 HeapProfile() { allocations_.reserve(1024); } 33 34 void ProcessChunk(const AsanChunkView &cv) { 35 if (cv.IsAllocated()) { 36 total_allocated_user_size_ += cv.UsedSize(); 37 total_allocated_count_++; 38 u32 id = cv.GetAllocStackId(); 39 if (id) 40 Insert(id, cv.UsedSize()); 41 } else if (cv.IsQuarantined()) { 42 total_quarantined_user_size_ += cv.UsedSize(); 43 total_quarantined_count_++; 44 } else { 45 total_other_count_++; 46 } 47 } 48 49 void Print(uptr top_percent, uptr max_number_of_contexts) { 50 Sort(allocations_.data(), allocations_.size(), 51 [](const AllocationSite &a, const AllocationSite &b) { 52 return a.total_size > b.total_size; 53 }); 54 CHECK(total_allocated_user_size_); 55 uptr total_shown = 0; 56 Printf("Live Heap Allocations: %zd bytes in %zd chunks; quarantined: " 57 "%zd bytes in %zd chunks; %zd other chunks; total chunks: %zd; " 58 "showing top %zd%% (at most %zd unique contexts)\n", 59 total_allocated_user_size_, total_allocated_count_, 60 total_quarantined_user_size_, total_quarantined_count_, 61 total_other_count_, total_allocated_count_ + 62 total_quarantined_count_ + total_other_count_, top_percent, 63 max_number_of_contexts); 64 for (uptr i = 0; i < Min(allocations_.size(), max_number_of_contexts); 65 i++) { 66 auto &a = allocations_[i]; 67 Printf("%zd byte(s) (%zd%%) in %zd allocation(s)\n", a.total_size, 68 a.total_size * 100 / total_allocated_user_size_, a.count); 69 StackDepotGet(a.id).Print(); 70 total_shown += a.total_size; 71 if (total_shown * 100 / total_allocated_user_size_ > top_percent) 72 break; 73 } 74 } 75 76 private: 77 uptr total_allocated_user_size_ = 0; 78 uptr total_allocated_count_ = 0; 79 uptr total_quarantined_user_size_ = 0; 80 uptr total_quarantined_count_ = 0; 81 uptr total_other_count_ = 0; 82 InternalMmapVector<AllocationSite> allocations_; 83 84 void Insert(u32 id, uptr size) { 85 // Linear lookup will be good enough for most cases (although not all). 86 for (uptr i = 0; i < allocations_.size(); i++) { 87 if (allocations_[i].id == id) { 88 allocations_[i].total_size += size; 89 allocations_[i].count++; 90 return; 91 } 92 } 93 allocations_.push_back({id, size, 1}); 94 } 95 }; 96 97 static void ChunkCallback(uptr chunk, void *arg) { 98 reinterpret_cast<HeapProfile*>(arg)->ProcessChunk( 99 FindHeapChunkByAllocBeg(chunk)); 100 } 101 102 static void MemoryProfileCB(uptr top_percent, uptr max_number_of_contexts) { 103 HeapProfile hp; 104 __lsan::LockAllocator(); 105 __lsan::ForEachChunk(ChunkCallback, &hp); 106 __lsan::UnlockAllocator(); 107 hp.Print(top_percent, max_number_of_contexts); 108 109 if (Verbosity()) 110 __asan_print_accumulated_stats(); 111 } 112 } // namespace __asan 113 114 #endif // CAN_SANITIZE_LEAKS 115 116 extern "C" { 117 SANITIZER_INTERFACE_ATTRIBUTE 118 void __sanitizer_print_memory_profile(uptr top_percent, 119 uptr max_number_of_contexts) { 120 #if CAN_SANITIZE_LEAKS 121 __asan::MemoryProfileCB(top_percent, max_number_of_contexts); 122 #endif // CAN_SANITIZE_LEAKS 123 } 124 } // extern "C" 125