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