1/*
2 * Copyright (C) 2015 The Android Open Source Project
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *  * Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 *  * Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in
12 *    the documentation and/or other materials provided with the
13 *    distribution.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * SUCH DAMAGE.
27 */
28
29#ifndef DEBUG_MALLOC_DEBUGDATA_H
30#define DEBUG_MALLOC_DEBUGDATA_H
31
32#include <stdint.h>
33
34#include <memory>
35#include <vector>
36
37#include <private/bionic_macros.h>
38
39#include "BacktraceData.h"
40#include "Config.h"
41#include "FreeTrackData.h"
42#include "GuardData.h"
43#include "malloc_debug.h"
44#include "TrackData.h"
45
46class DebugData {
47 public:
48  DebugData() = default;
49  ~DebugData() = default;
50
51  bool Initialize();
52
53  static bool Disabled();
54
55  inline void* GetPointer(const Header* header) {
56    uintptr_t value = reinterpret_cast<uintptr_t>(header);
57    return reinterpret_cast<void*>(value + pointer_offset_);
58  }
59
60  Header* GetHeader(const void* pointer) {
61    uintptr_t value = reinterpret_cast<uintptr_t>(pointer);
62    return reinterpret_cast<Header*>(value - pointer_offset_);
63  }
64
65  BacktraceHeader* GetAllocBacktrace(const Header* header) {
66    uintptr_t value = reinterpret_cast<uintptr_t>(header);
67    return reinterpret_cast<BacktraceHeader*>(value + backtrace->alloc_offset());
68  }
69
70  uint8_t* GetFrontGuard(const Header* header) {
71    uintptr_t value = reinterpret_cast<uintptr_t>(header);
72    return reinterpret_cast<uint8_t*>(value + front_guard->offset());
73  }
74
75  uint8_t* GetRearGuard(const Header* header) {
76    uintptr_t value = reinterpret_cast<uintptr_t>(GetPointer(header));
77    return reinterpret_cast<uint8_t*>(value + header->real_size());
78  }
79
80  const Config& config() { return config_; }
81  size_t pointer_offset() { return pointer_offset_; }
82  bool need_header() { return need_header_; }
83  size_t extra_bytes() { return extra_bytes_; }
84
85  void PrepareFork();
86  void PostForkParent();
87  void PostForkChild();
88
89  std::unique_ptr<BacktraceData> backtrace;
90  std::unique_ptr<TrackData> track;
91  std::unique_ptr<FrontGuardData> front_guard;
92  std::unique_ptr<RearGuardData> rear_guard;
93  std::unique_ptr<FreeTrackData> free_track;
94
95 private:
96  size_t extra_bytes_ = 0;
97
98  size_t pointer_offset_ = 0;
99  bool need_header_ = false;
100
101  Config config_;
102
103  DISALLOW_COPY_AND_ASSIGN(DebugData);
104};
105
106#endif // MALLOC_DEBUG_DEBUGDATA_H
107