1 //===-- asan_process.h ------------------------------------------*- C++ -*-===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 // 10 // This file is a part of AddressSanitizer, an address sanity checker. 11 // 12 // Information about the process mappings. 13 //===----------------------------------------------------------------------===// 14 #ifndef ASAN_PROCMAPS_H 15 #define ASAN_PROCMAPS_H 16 17 #include "asan_internal.h" 18 19 namespace __asan { 20 21 class AsanProcMaps { 22 public: 23 AsanProcMaps(); 24 bool Next(uintptr_t *start, uintptr_t *end, uintptr_t *offset, 25 char filename[], size_t filename_size); 26 void Reset(); 27 // Gets the object file name and the offset in that object for a given 28 // address 'addr'. Returns true on success. 29 bool GetObjectNameAndOffset(uintptr_t addr, uintptr_t *offset, 30 char filename[], size_t filename_size); 31 ~AsanProcMaps(); 32 private: 33 // Default implementation of GetObjectNameAndOffset. 34 // Quite slow, because it iterates through the whole process map for each 35 // lookup. 36 bool IterateForObjectNameAndOffset(uintptr_t addr, uintptr_t *offset, 37 char filename[], size_t filename_size) { 38 Reset(); 39 uintptr_t start, end, file_offset; 40 for (int i = 0; Next(&start, &end, &file_offset, filename, filename_size); 41 i++) { 42 if (addr >= start && addr < end) { 43 // Don't subtract 'start' for the first entry. Don't ask me why. 44 *offset = (addr - (i ? start : 0)) + file_offset; 45 return true; 46 } 47 } 48 if (filename_size) 49 filename[0] = '\0'; 50 return false; 51 } 52 53 #if defined __linux__ 54 char *proc_self_maps_buff_; 55 size_t proc_self_maps_buff_mmaped_size_; 56 size_t proc_self_maps_buff_len_; 57 char *current_; 58 #elif defined __APPLE__ 59 template<uint32_t kLCSegment, typename SegmentCommand> 60 bool NextSegmentLoad(uintptr_t *start, uintptr_t *end, uintptr_t *offset, 61 char filename[], size_t filename_size); 62 int current_image_; 63 uint32_t current_magic_; 64 int current_load_cmd_count_; 65 char *current_load_cmd_addr_; 66 #endif 67 }; 68 69 } // namespace __asan 70 71 #endif // ASAN_PROCMAPS_H 72
