130 lines
4.1 KiB
C++
130 lines
4.1 KiB
C++
//===-- asan_memory_profile.cpp ----------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file is a part of AddressSanitizer, an address sanity checker.
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//
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// This file implements __sanitizer_print_memory_profile.
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//===----------------------------------------------------------------------===//
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#include "sanitizer_common/sanitizer_common.h"
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#include "sanitizer_common/sanitizer_stackdepot.h"
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#include "sanitizer_common/sanitizer_stacktrace.h"
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#include "sanitizer_common/sanitizer_stoptheworld.h"
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#include "lsan/lsan_common.h"
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#include "asan/asan_allocator.h"
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#if CAN_SANITIZE_LEAKS
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namespace __asan {
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struct AllocationSite {
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u32 id;
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uptr total_size;
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uptr count;
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};
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class HeapProfile {
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public:
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HeapProfile() { allocations_.reserve(1024); }
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void ProcessChunk(const AsanChunkView &cv) {
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if (cv.IsAllocated()) {
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total_allocated_user_size_ += cv.UsedSize();
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total_allocated_count_++;
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u32 id = cv.GetAllocStackId();
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if (id)
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Insert(id, cv.UsedSize());
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} else if (cv.IsQuarantined()) {
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total_quarantined_user_size_ += cv.UsedSize();
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total_quarantined_count_++;
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} else {
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total_other_count_++;
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}
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}
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void Print(uptr top_percent, uptr max_number_of_contexts) {
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Sort(allocations_.data(), allocations_.size(),
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[](const AllocationSite &a, const AllocationSite &b) {
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return a.total_size > b.total_size;
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});
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CHECK(total_allocated_user_size_);
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uptr total_shown = 0;
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Printf("Live Heap Allocations: %zd bytes in %zd chunks; quarantined: "
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"%zd bytes in %zd chunks; %zd other chunks; total chunks: %zd; "
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"showing top %zd%% (at most %zd unique contexts)\n",
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total_allocated_user_size_, total_allocated_count_,
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total_quarantined_user_size_, total_quarantined_count_,
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total_other_count_, total_allocated_count_ +
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total_quarantined_count_ + total_other_count_, top_percent,
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max_number_of_contexts);
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for (uptr i = 0; i < Min(allocations_.size(), max_number_of_contexts);
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i++) {
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auto &a = allocations_[i];
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Printf("%zd byte(s) (%zd%%) in %zd allocation(s)\n", a.total_size,
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a.total_size * 100 / total_allocated_user_size_, a.count);
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StackDepotGet(a.id).Print();
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total_shown += a.total_size;
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if (total_shown * 100 / total_allocated_user_size_ > top_percent)
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break;
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}
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}
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private:
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uptr total_allocated_user_size_ = 0;
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uptr total_allocated_count_ = 0;
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uptr total_quarantined_user_size_ = 0;
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uptr total_quarantined_count_ = 0;
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uptr total_other_count_ = 0;
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InternalMmapVector<AllocationSite> allocations_;
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void Insert(u32 id, uptr size) {
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// Linear lookup will be good enough for most cases (although not all).
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for (uptr i = 0; i < allocations_.size(); i++) {
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if (allocations_[i].id == id) {
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allocations_[i].total_size += size;
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allocations_[i].count++;
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return;
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}
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}
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allocations_.push_back({id, size, 1});
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}
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};
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static void ChunkCallback(uptr chunk, void *arg) {
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reinterpret_cast<HeapProfile*>(arg)->ProcessChunk(
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FindHeapChunkByAllocBeg(chunk));
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}
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static void MemoryProfileCB(const SuspendedThreadsList &suspended_threads_list,
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void *argument) {
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HeapProfile hp;
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__lsan::ForEachChunk(ChunkCallback, &hp);
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uptr *Arg = reinterpret_cast<uptr*>(argument);
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hp.Print(Arg[0], Arg[1]);
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if (Verbosity())
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__asan_print_accumulated_stats();
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}
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} // namespace __asan
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#endif // CAN_SANITIZE_LEAKS
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extern "C" {
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SANITIZER_INTERFACE_ATTRIBUTE
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void __sanitizer_print_memory_profile(uptr top_percent,
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uptr max_number_of_contexts) {
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#if CAN_SANITIZE_LEAKS
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uptr Arg[2];
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Arg[0] = top_percent;
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Arg[1] = max_number_of_contexts;
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__sanitizer::StopTheWorld(__asan::MemoryProfileCB, Arg);
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#endif // CAN_SANITIZE_LEAKS
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}
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} // extern "C"
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