1 //===-- sanitizer_symbolizer_mac.cc ---------------------------------------===// 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 shared between various sanitizers' runtime libraries. 11 // 12 // Implementation of Mac-specific "atos" symbolizer. 13 //===----------------------------------------------------------------------===// 14 15 #include "sanitizer_platform.h" 16 #if SANITIZER_MAC 17 18 #include "sanitizer_allocator_internal.h" 19 #include "sanitizer_mac.h" 20 #include "sanitizer_symbolizer_mac.h" 21 22 #include <dlfcn.h> 23 #include <errno.h> 24 #include <stdlib.h> 25 #include <sys/wait.h> 26 #include <unistd.h> 27 #include <util.h> 28 29 namespace __sanitizer { 30 31 bool DlAddrSymbolizer::SymbolizePC(uptr addr, SymbolizedStack *stack) { 32 Dl_info info; 33 int result = dladdr((const void *)addr, &info); 34 if (!result) return false; 35 const char *demangled = DemangleSwiftAndCXX(info.dli_sname); 36 if (!demangled) return false; 37 stack->info.function = internal_strdup(demangled); 38 return true; 39 } 40 41 bool DlAddrSymbolizer::SymbolizeData(uptr addr, DataInfo *datainfo) { 42 Dl_info info; 43 int result = dladdr((const void *)addr, &info); 44 if (!result) return false; 45 const char *demangled = DemangleSwiftAndCXX(info.dli_sname); 46 datainfo->name = internal_strdup(demangled); 47 datainfo->start = (uptr)info.dli_saddr; 48 return true; 49 } 50 51 class AtosSymbolizerProcess : public SymbolizerProcess { 52 public: 53 explicit AtosSymbolizerProcess(const char *path, pid_t parent_pid) 54 : SymbolizerProcess(path, /*use_forkpty*/ true) { 55 // Put the string command line argument in the object so that it outlives 56 // the call to GetArgV. 57 internal_snprintf(pid_str_, sizeof(pid_str_), "%d", parent_pid); 58 } 59 60 private: 61 bool ReachedEndOfOutput(const char *buffer, uptr length) const override { 62 return (length >= 1 && buffer[length - 1] == '\n'); 63 } 64 65 void GetArgV(const char *path_to_binary, 66 const char *(&argv)[kArgVMax]) const override { 67 int i = 0; 68 argv[i++] = path_to_binary; 69 argv[i++] = "-p"; 70 argv[i++] = &pid_str_[0]; 71 if (GetMacosVersion() == MACOS_VERSION_MAVERICKS) { 72 // On Mavericks atos prints a deprecation warning which we suppress by 73 // passing -d. The warning isn't present on other OSX versions, even the 74 // newer ones. 75 argv[i++] = "-d"; 76 } 77 argv[i++] = nullptr; 78 } 79 80 char pid_str_[16]; 81 }; 82 83 static bool ParseCommandOutput(const char *str, uptr addr, char **out_name, 84 char **out_module, char **out_file, uptr *line, 85 uptr *start_address) { 86 // Trim ending newlines. 87 char *trim; 88 ExtractTokenUpToDelimiter(str, "\n", &trim); 89 90 // The line from `atos` is in one of these formats: 91 // myfunction (in library.dylib) (sourcefile.c:17) 92 // myfunction (in library.dylib) + 0x1fe 93 // myfunction (in library.dylib) + 15 94 // 0xdeadbeef (in library.dylib) + 0x1fe 95 // 0xdeadbeef (in library.dylib) + 15 96 // 0xdeadbeef (in library.dylib) 97 // 0xdeadbeef 98 99 const char *rest = trim; 100 char *symbol_name; 101 rest = ExtractTokenUpToDelimiter(rest, " (in ", &symbol_name); 102 if (rest[0] == '\0') { 103 InternalFree(symbol_name); 104 InternalFree(trim); 105 return false; 106 } 107 108 if (internal_strncmp(symbol_name, "0x", 2) != 0) 109 *out_name = symbol_name; 110 else 111 InternalFree(symbol_name); 112 rest = ExtractTokenUpToDelimiter(rest, ") ", out_module); 113 114 if (rest[0] == '(') { 115 if (out_file) { 116 rest++; 117 rest = ExtractTokenUpToDelimiter(rest, ":", out_file); 118 char *extracted_line_number; 119 rest = ExtractTokenUpToDelimiter(rest, ")", &extracted_line_number); 120 if (line) *line = (uptr)internal_atoll(extracted_line_number); 121 InternalFree(extracted_line_number); 122 } 123 } else if (rest[0] == '+') { 124 rest += 2; 125 uptr offset = internal_atoll(rest); 126 if (start_address) *start_address = addr - offset; 127 } 128 129 InternalFree(trim); 130 return true; 131 } 132 133 AtosSymbolizer::AtosSymbolizer(const char *path, LowLevelAllocator *allocator) 134 : process_(new(*allocator) AtosSymbolizerProcess(path, getpid())) {} 135 136 bool AtosSymbolizer::SymbolizePC(uptr addr, SymbolizedStack *stack) { 137 if (!process_) return false; 138 if (addr == 0) return false; 139 char command[32]; 140 internal_snprintf(command, sizeof(command), "0x%zx\n", addr); 141 const char *buf = process_->SendCommand(command); 142 if (!buf) return false; 143 uptr line; 144 if (!ParseCommandOutput(buf, addr, &stack->info.function, &stack->info.module, 145 &stack->info.file, &line, nullptr)) { 146 process_ = nullptr; 147 return false; 148 } 149 stack->info.line = (int)line; 150 return true; 151 } 152 153 bool AtosSymbolizer::SymbolizeData(uptr addr, DataInfo *info) { 154 if (!process_) return false; 155 char command[32]; 156 internal_snprintf(command, sizeof(command), "0x%zx\n", addr); 157 const char *buf = process_->SendCommand(command); 158 if (!buf) return false; 159 if (!ParseCommandOutput(buf, addr, &info->name, &info->module, nullptr, 160 nullptr, &info->start)) { 161 process_ = nullptr; 162 return false; 163 } 164 return true; 165 } 166 167 } // namespace __sanitizer 168 169 #endif // SANITIZER_MAC 170
Indexes created Sat Sep 20 22:09:52 GMT 2025