contrib/compiler-rt/lib/asan/asan_memory_profile.cc

   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:
  34   HeapProfile() : allocations_(1024) {}
  35
  36   void ProcessChunk(const AsanChunkView& cv) {
  37     if (cv.IsAllocated()) {
  38       total_allocated_user_size_ += cv.UsedSize();
  39       total_allocated_count_++;
  40       u32 id = cv.GetAllocStackId();
  41       if (id)
  42         Insert(id, cv.UsedSize());
  43     } else if (cv.IsQuarantined()) {
  44       total_quarantined_user_size_ += cv.UsedSize();
  45       total_quarantined_count_++;
  46     } else {
  47       total_other_count_++;
  48     }
  49   }
  50
  51   void Print(uptr top_percent) {
  52     InternalSort(&allocations_, allocations_.size(),
  53                  [](const AllocationSite &a, const AllocationSite &b) {
  54                    return a.total_size > b.total_size;
  55                  });
  56     CHECK(total_allocated_user_size_);
  57     uptr total_shown = 0;
  58     Printf("Live Heap Allocations: %zd bytes in %zd chunks; quarantined: "
  59            "%zd bytes in %zd chunks; %zd other chunks; total chunks: %zd; "
  60            "showing top %zd%%\n",
  61            total_allocated_user_size_, total_allocated_count_,
  62            total_quarantined_user_size_, total_quarantined_count_,
  63            total_other_count_, total_allocated_count_ +
  64            total_quarantined_count_ + total_other_count_, top_percent);
  65     for (uptr i = 0; i < allocations_.size(); 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(const SuspendedThreadsList &suspended_threads_list,
 103                             void *argument) {
 104   HeapProfile hp;
 105   __lsan::ForEachChunk(ChunkCallback, &hp);
 106   hp.Print(reinterpret_cast<uptr>(argument));
 107 }
 108
 109 }  // namespace __asan
 110
 111 extern "C" {
 112 SANITIZER_INTERFACE_ATTRIBUTE
 113 void __sanitizer_print_memory_profile(uptr top_percent) {
 114   __sanitizer::StopTheWorld(__asan::MemoryProfileCB, (void*)top_percent);
 115 }
 116 }  // extern "C"
 117
 118 #endif  // CAN_SANITIZE_LEAKS