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 "RecordData.h" 45 #include "TrackData.h" 46 47 class DebugData { 48 public: 49 DebugData() = default; 50 ~DebugData() = default; 51 52 bool Initialize(const char* options); 53 54 static bool Disabled(); 55 GetPointer(const Header * header)56 inline void* GetPointer(const Header* header) { 57 uintptr_t value = reinterpret_cast<uintptr_t>(header); 58 return reinterpret_cast<void*>(value + pointer_offset_); 59 } 60 GetHeader(const void * pointer)61 Header* GetHeader(const void* pointer) { 62 uintptr_t value = reinterpret_cast<uintptr_t>(pointer); 63 return reinterpret_cast<Header*>(value - pointer_offset_); 64 } 65 GetAllocBacktrace(const Header * header)66 BacktraceHeader* GetAllocBacktrace(const Header* header) { 67 uintptr_t value = reinterpret_cast<uintptr_t>(header); 68 return reinterpret_cast<BacktraceHeader*>(value + backtrace->alloc_offset()); 69 } 70 GetFrontGuard(const Header * header)71 uint8_t* GetFrontGuard(const Header* header) { 72 uintptr_t value = reinterpret_cast<uintptr_t>(header); 73 return reinterpret_cast<uint8_t*>(value + front_guard->offset()); 74 } 75 GetRearGuard(const Header * header)76 uint8_t* GetRearGuard(const Header* header) { 77 uintptr_t value = reinterpret_cast<uintptr_t>(GetPointer(header)); 78 return reinterpret_cast<uint8_t*>(value + header->real_size()); 79 } 80 config()81 const Config& config() { return config_; } pointer_offset()82 size_t pointer_offset() { return pointer_offset_; } need_header()83 bool need_header() { return need_header_; } extra_bytes()84 size_t extra_bytes() { return extra_bytes_; } 85 86 void PrepareFork(); 87 void PostForkParent(); 88 void PostForkChild(); 89 90 std::unique_ptr<BacktraceData> backtrace; 91 std::unique_ptr<TrackData> track; 92 std::unique_ptr<FrontGuardData> front_guard; 93 std::unique_ptr<RearGuardData> rear_guard; 94 std::unique_ptr<FreeTrackData> free_track; 95 std::unique_ptr<RecordData> record; 96 97 private: 98 size_t extra_bytes_ = 0; 99 100 size_t pointer_offset_ = 0; 101 bool need_header_ = false; 102 103 Config config_; 104 105 DISALLOW_COPY_AND_ASSIGN(DebugData); 106 }; 107 108 extern DebugData* g_debug; 109 110 #endif // MALLOC_DEBUG_DEBUGDATA_H 111