1/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef LIBMEMUNREACHABLE_LEAK_FOLDING_H_
18#define LIBMEMUNREACHABLE_LEAK_FOLDING_H_
19
20#include "HeapWalker.h"
21
22namespace android {
23
24class LeakFolding {
25 public:
26  LeakFolding(Allocator<void> allocator, HeapWalker& heap_walker)
27      : allocator_(allocator),
28        heap_walker_(heap_walker),
29        leak_map_(allocator),
30        leak_graph_(allocator),
31        leak_scc_(allocator) {}
32
33  bool FoldLeaks();
34
35  struct Leak {
36    const Range range;
37    size_t referenced_count;
38    size_t referenced_size;
39  };
40
41  bool Leaked(allocator::vector<Leak>& leaked, size_t* num_leaks_out, size_t* leak_bytes_out);
42
43 private:
44  DISALLOW_COPY_AND_ASSIGN(LeakFolding);
45  Allocator<void> allocator_;
46  HeapWalker& heap_walker_;
47
48  struct SCCInfo {
49   public:
50    Node<SCCInfo> node;
51
52    size_t count;
53    size_t size;
54
55    size_t cuumulative_count;
56    size_t cuumulative_size;
57
58    bool dominator;
59    SCCInfo* accumulator;
60
61    explicit SCCInfo(Allocator<SCCInfo> allocator)
62        : node(this, allocator),
63          count(0),
64          size(0),
65          cuumulative_count(0),
66          cuumulative_size(0),
67          dominator(false),
68          accumulator(nullptr) {}
69
70   private:
71    SCCInfo(SCCInfo&&) = delete;
72    DISALLOW_COPY_AND_ASSIGN(SCCInfo);
73  };
74
75  struct LeakInfo {
76   public:
77    Node<LeakInfo> node;
78
79    const Range range;
80
81    SCCInfo* scc;
82
83    LeakInfo(const Range& range, Allocator<LeakInfo> allocator)
84        : node(this, allocator), range(range), scc(nullptr) {}
85
86   private:
87    DISALLOW_COPY_AND_ASSIGN(LeakInfo);
88  };
89
90  void ComputeDAG();
91  void AccumulateLeaks(SCCInfo* dominator);
92
93  allocator::map<Range, LeakInfo, compare_range> leak_map_;
94  Graph<LeakInfo> leak_graph_;
95  allocator::vector<Allocator<SCCInfo>::unique_ptr> leak_scc_;
96};
97
98}  // namespace android
99
100#endif  // LIBMEMUNREACHABLE_LEAK_FOLDING_H_
101