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 46 class 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
