1 //===-- asan_memory_profile.cc.cc -----------------------------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file is a part of AddressSanitizer, an address sanity checker.
11 //
12 // This file implements __sanitizer_print_memory_profile.
13 //===----------------------------------------------------------------------===//
14
15 #include "sanitizer_common/sanitizer_common.h"
16 #include "sanitizer_common/sanitizer_stackdepot.h"
17 #include "sanitizer_common/sanitizer_stacktrace.h"
18 #include "sanitizer_common/sanitizer_stoptheworld.h"
19 #include "lsan/lsan_common.h"
20 #include "asan/asan_allocator.h"
21
22 #if CAN_SANITIZE_LEAKS
23
24 namespace __asan {
25
26 struct AllocationSite {
27 u32 id;
28 uptr total_size;
29 uptr count;
30 };
31
32 class HeapProfile {
33 public:
HeapProfile()34 HeapProfile() : allocations_(1024) {}
Insert(u32 id,uptr size)35 void Insert(u32 id, uptr size) {
36 total_allocated_ += size;
37 total_count_++;
38 // Linear lookup will be good enough for most cases (although not all).
39 for (uptr i = 0; i < allocations_.size(); i++) {
40 if (allocations_[i].id == id) {
41 allocations_[i].total_size += size;
42 allocations_[i].count++;
43 return;
44 }
45 }
46 allocations_.push_back({id, size, 1});
47 }
48
Print(uptr top_percent)49 void Print(uptr top_percent) {
50 InternalSort(&allocations_, allocations_.size(),
51 [](const AllocationSite &a, const AllocationSite &b) {
52 return a.total_size > b.total_size;
53 });
54 CHECK(total_allocated_);
55 uptr total_shown = 0;
56 Printf("Live Heap Allocations: %zd bytes from %zd allocations; "
57 "showing top %zd%%\n", total_allocated_, total_count_, top_percent);
58 for (uptr i = 0; i < allocations_.size(); i++) {
59 auto &a = allocations_[i];
60 Printf("%zd byte(s) (%zd%%) in %zd allocation(s)\n", a.total_size,
61 a.total_size * 100 / total_allocated_, a.count);
62 StackDepotGet(a.id).Print();
63 total_shown += a.total_size;
64 if (total_shown * 100 / total_allocated_ > top_percent)
65 break;
66 }
67 }
68
69 private:
70 uptr total_allocated_ = 0;
71 uptr total_count_ = 0;
72 InternalMmapVector<AllocationSite> allocations_;
73 };
74
ChunkCallback(uptr chunk,void * arg)75 static void ChunkCallback(uptr chunk, void *arg) {
76 HeapProfile *hp = reinterpret_cast<HeapProfile*>(arg);
77 AsanChunkView cv = FindHeapChunkByAddress(chunk);
78 if (!cv.IsAllocated()) return;
79 u32 id = cv.GetAllocStackId();
80 if (!id) return;
81 hp->Insert(id, cv.UsedSize());
82 }
83
MemoryProfileCB(const SuspendedThreadsList & suspended_threads_list,void * argument)84 static void MemoryProfileCB(const SuspendedThreadsList &suspended_threads_list,
85 void *argument) {
86 HeapProfile hp;
87 __lsan::ForEachChunk(ChunkCallback, &hp);
88 hp.Print(reinterpret_cast<uptr>(argument));
89 }
90
91 } // namespace __asan
92
93 extern "C" {
94 SANITIZER_INTERFACE_ATTRIBUTE
__sanitizer_print_memory_profile(uptr top_percent)95 void __sanitizer_print_memory_profile(uptr top_percent) {
96 __sanitizer::StopTheWorld(__asan::MemoryProfileCB, (void*)top_percent);
97 }
98 } // extern "C"
99
100 #endif // CAN_SANITIZE_LEAKS
101