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 #pragma once 30 31 #include <stdint.h> 32 33 #include <memory> 34 #include <vector> 35 36 #include <private/bionic_macros.h> 37 38 #include "Config.h" 39 #include "GuardData.h" 40 #include "PointerData.h" 41 #include "RecordData.h" 42 #include "malloc_debug.h" 43 44 class DebugData { 45 public: 46 DebugData() = default; 47 ~DebugData() = default; 48 49 bool Initialize(const char* options); 50 51 static bool Disabled(); 52 GetPointer(const Header * header)53 inline void* GetPointer(const Header* header) { 54 uintptr_t value = reinterpret_cast<uintptr_t>(header); 55 return reinterpret_cast<void*>(value + pointer_offset_); 56 } 57 GetHeader(const void * pointer)58 Header* GetHeader(const void* pointer) { 59 uintptr_t value = reinterpret_cast<uintptr_t>(pointer); 60 return reinterpret_cast<Header*>(value - pointer_offset_); 61 } 62 GetFrontGuard(const Header * header)63 uint8_t* GetFrontGuard(const Header* header) { 64 uintptr_t value = reinterpret_cast<uintptr_t>(header); 65 return reinterpret_cast<uint8_t*>(value + front_guard->offset()); 66 } 67 GetRearGuard(const Header * header)68 uint8_t* GetRearGuard(const Header* header) { 69 uintptr_t value = reinterpret_cast<uintptr_t>(GetPointer(header)); 70 return reinterpret_cast<uint8_t*>(value + header->size); 71 } 72 config()73 const Config& config() { return config_; } pointer_offset()74 size_t pointer_offset() { return pointer_offset_; } extra_bytes()75 size_t extra_bytes() { return extra_bytes_; } 76 TrackPointers()77 bool TrackPointers() { return config_.options() & TRACK_ALLOCS; } 78 HeaderEnabled()79 bool HeaderEnabled() { return config_.options() & HEADER_OPTIONS; } 80 81 void PrepareFork(); 82 void PostForkParent(); 83 void PostForkChild(); 84 85 std::unique_ptr<FrontGuardData> front_guard; 86 std::unique_ptr<PointerData> pointer; 87 std::unique_ptr<RearGuardData> rear_guard; 88 std::unique_ptr<RecordData> record; 89 90 private: 91 size_t extra_bytes_ = 0; 92 93 size_t pointer_offset_ = 0; 94 95 Config config_; 96 97 BIONIC_DISALLOW_COPY_AND_ASSIGN(DebugData); 98 }; 99 100 extern DebugData* g_debug; 101