1 //===-- sanitizer_symbolizer_libcdep.cc -----------------------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file is shared between AddressSanitizer and ThreadSanitizer
11 // run-time libraries.
12 //===----------------------------------------------------------------------===//
14 #include "sanitizer_allocator_internal.h"
15 #include "sanitizer_internal_defs.h"
16 #include "sanitizer_symbolizer_internal.h"
18 namespace __sanitizer {
20 const char *ExtractToken(const char *str, const char *delims, char **result) {
21 uptr prefix_len = internal_strcspn(str, delims);
22 *result = (char*)InternalAlloc(prefix_len + 1);
23 internal_memcpy(*result, str, prefix_len);
24 (*result)[prefix_len] = '\0';
25 const char *prefix_end = str + prefix_len;
26 if (*prefix_end != '\0') prefix_end++;
30 const char *ExtractInt(const char *str, const char *delims, int *result) {
32 const char *ret = ExtractToken(str, delims, &buff);
34 *result = (int)internal_atoll(buff);
40 const char *ExtractUptr(const char *str, const char *delims, uptr *result) {
42 const char *ret = ExtractToken(str, delims, &buff);
44 *result = (uptr)internal_atoll(buff);
50 const char *ExtractTokenUpToDelimiter(const char *str, const char *delimiter,
52 const char *found_delimiter = internal_strstr(str, delimiter);
54 found_delimiter ? found_delimiter - str : internal_strlen(str);
55 *result = (char *)InternalAlloc(prefix_len + 1);
56 internal_memcpy(*result, str, prefix_len);
57 (*result)[prefix_len] = '\0';
58 const char *prefix_end = str + prefix_len;
59 if (*prefix_end != '\0') prefix_end += internal_strlen(delimiter);
63 SymbolizedStack *Symbolizer::SymbolizePC(uptr addr) {
64 BlockingMutexLock l(&mu_);
65 const char *module_name;
67 SymbolizedStack *res = SymbolizedStack::New(addr);
68 if (!FindModuleNameAndOffsetForAddress(addr, &module_name, &module_offset))
70 // Always fill data about module name and offset.
71 res->info.FillModuleInfo(module_name, module_offset);
72 for (auto iter = Iterator(&tools_); iter.hasNext();) {
73 auto *tool = iter.next();
74 SymbolizerScope sym_scope(this);
75 if (tool->SymbolizePC(addr, res)) {
82 bool Symbolizer::SymbolizeData(uptr addr, DataInfo *info) {
83 BlockingMutexLock l(&mu_);
84 const char *module_name;
86 if (!FindModuleNameAndOffsetForAddress(addr, &module_name, &module_offset))
89 info->module = internal_strdup(module_name);
90 info->module_offset = module_offset;
91 for (auto iter = Iterator(&tools_); iter.hasNext();) {
92 auto *tool = iter.next();
93 SymbolizerScope sym_scope(this);
94 if (tool->SymbolizeData(addr, info)) {
101 bool Symbolizer::GetModuleNameAndOffsetForPC(uptr pc, const char **module_name,
102 uptr *module_address) {
103 BlockingMutexLock l(&mu_);
104 const char *internal_module_name = nullptr;
105 if (!FindModuleNameAndOffsetForAddress(pc, &internal_module_name,
110 *module_name = module_names_.GetOwnedCopy(internal_module_name);
114 void Symbolizer::Flush() {
115 BlockingMutexLock l(&mu_);
116 for (auto iter = Iterator(&tools_); iter.hasNext();) {
117 auto *tool = iter.next();
118 SymbolizerScope sym_scope(this);
123 const char *Symbolizer::Demangle(const char *name) {
124 BlockingMutexLock l(&mu_);
125 for (auto iter = Iterator(&tools_); iter.hasNext();) {
126 auto *tool = iter.next();
127 SymbolizerScope sym_scope(this);
128 if (const char *demangled = tool->Demangle(name))
131 return PlatformDemangle(name);
134 void Symbolizer::PrepareForSandboxing() {
135 BlockingMutexLock l(&mu_);
136 PlatformPrepareForSandboxing();
139 bool Symbolizer::FindModuleNameAndOffsetForAddress(uptr address,
140 const char **module_name,
141 uptr *module_offset) {
142 LoadedModule *module = FindModuleForAddress(address);
145 *module_name = module->full_name();
146 *module_offset = address - module->base_address();
150 LoadedModule *Symbolizer::FindModuleForAddress(uptr address) {
151 bool modules_were_reloaded = false;
152 if (!modules_fresh_) {
153 for (uptr i = 0; i < n_modules_; i++)
156 GetListOfModules(modules_, kMaxNumberOfModules, /* filter */ nullptr);
157 CHECK_GT(n_modules_, 0);
158 CHECK_LT(n_modules_, kMaxNumberOfModules);
159 modules_fresh_ = true;
160 modules_were_reloaded = true;
162 for (uptr i = 0; i < n_modules_; i++) {
163 if (modules_[i].containsAddress(address)) {
167 // Reload the modules and look up again, if we haven't tried it yet.
168 if (!modules_were_reloaded) {
169 // FIXME: set modules_fresh_ from dlopen()/dlclose() interceptors.
170 // It's too aggressive to reload the list of modules each time we fail
171 // to find a module for a given address.
172 modules_fresh_ = false;
173 return FindModuleForAddress(address);
178 Symbolizer *Symbolizer::GetOrInit() {
179 SpinMutexLock l(&init_mu_);
182 symbolizer_ = PlatformInit();
187 // For now we assume the following protocol:
188 // For each request of the form
189 // <module_name> <module_offset>
190 // passed to STDIN, external symbolizer prints to STDOUT response:
192 // <file_name>:<line_number>:<column_number>
194 // <file_name>:<line_number>:<column_number>
197 class LLVMSymbolizerProcess : public SymbolizerProcess {
199 explicit LLVMSymbolizerProcess(const char *path) : SymbolizerProcess(path) {}
202 bool ReachedEndOfOutput(const char *buffer, uptr length) const override {
203 // Empty line marks the end of llvm-symbolizer output.
204 return length >= 2 && buffer[length - 1] == '\n' &&
205 buffer[length - 2] == '\n';
208 void GetArgV(const char *path_to_binary,
209 const char *(&argv)[kArgVMax]) const override {
210 #if defined(__x86_64h__)
211 const char* const kSymbolizerArch = "--default-arch=x86_64h";
212 #elif defined(__x86_64__)
213 const char* const kSymbolizerArch = "--default-arch=x86_64";
214 #elif defined(__i386__)
215 const char* const kSymbolizerArch = "--default-arch=i386";
216 #elif defined(__powerpc64__) && defined(__BIG_ENDIAN__)
217 const char* const kSymbolizerArch = "--default-arch=powerpc64";
218 #elif defined(__powerpc64__) && defined(__LITTLE_ENDIAN__)
219 const char* const kSymbolizerArch = "--default-arch=powerpc64le";
221 const char* const kSymbolizerArch = "--default-arch=unknown";
224 const char *const inline_flag = common_flags()->symbolize_inline_frames
226 : "--inlining=false";
228 argv[i++] = path_to_binary;
229 argv[i++] = inline_flag;
230 argv[i++] = kSymbolizerArch;
235 LLVMSymbolizer::LLVMSymbolizer(const char *path, LowLevelAllocator *allocator)
236 : symbolizer_process_(new(*allocator) LLVMSymbolizerProcess(path)) {}
238 // Parse a <file>:<line>[:<column>] buffer. The file path may contain colons on
239 // Windows, so extract tokens from the right hand side first. The column info is
241 static const char *ParseFileLineInfo(AddressInfo *info, const char *str) {
242 char *file_line_info = 0;
243 str = ExtractToken(str, "\n", &file_line_info);
244 CHECK(file_line_info);
245 // Parse the last :<int>, which must be there.
246 char *last_colon = internal_strrchr(file_line_info, ':');
248 int line_or_column = internal_atoll(last_colon + 1);
249 // Truncate the string at the last colon and find the next-to-last colon.
251 last_colon = internal_strrchr(file_line_info, ':');
252 if (last_colon && IsDigit(last_colon[1])) {
253 // If the second-to-last colon is followed by a digit, it must be the line
254 // number, and the previous parsed number was a column.
255 info->line = internal_atoll(last_colon + 1);
256 info->column = line_or_column;
259 // Otherwise, we have line info but no column info.
260 info->line = line_or_column;
263 ExtractToken(file_line_info, "", &info->file);
264 InternalFree(file_line_info);
268 // Parses one or more two-line strings in the following format:
270 // <file_name>:<line_number>[:<column_number>]
271 // Used by LLVMSymbolizer, Addr2LinePool and InternalSymbolizer, since all of
272 // them use the same output format.
273 void ParseSymbolizePCOutput(const char *str, SymbolizedStack *res) {
274 bool top_frame = true;
275 SymbolizedStack *last = res;
277 char *function_name = 0;
278 str = ExtractToken(str, "\n", &function_name);
279 CHECK(function_name);
280 if (function_name[0] == '\0') {
281 // There are no more frames.
282 InternalFree(function_name);
285 SymbolizedStack *cur;
290 cur = SymbolizedStack::New(res->info.address);
291 cur->info.FillModuleInfo(res->info.module, res->info.module_offset);
296 AddressInfo *info = &cur->info;
297 info->function = function_name;
298 str = ParseFileLineInfo(info, str);
300 // Functions and filenames can be "??", in which case we write 0
301 // to address info to mark that names are unknown.
302 if (0 == internal_strcmp(info->function, "??")) {
303 InternalFree(info->function);
306 if (0 == internal_strcmp(info->file, "??")) {
307 InternalFree(info->file);
313 // Parses a two-line string in the following format:
315 // <start_address> <size>
316 // Used by LLVMSymbolizer and InternalSymbolizer.
317 void ParseSymbolizeDataOutput(const char *str, DataInfo *info) {
318 str = ExtractToken(str, "\n", &info->name);
319 str = ExtractUptr(str, " ", &info->start);
320 str = ExtractUptr(str, "\n", &info->size);
323 bool LLVMSymbolizer::SymbolizePC(uptr addr, SymbolizedStack *stack) {
324 if (const char *buf = SendCommand(/*is_data*/ false, stack->info.module,
325 stack->info.module_offset)) {
326 ParseSymbolizePCOutput(buf, stack);
332 bool LLVMSymbolizer::SymbolizeData(uptr addr, DataInfo *info) {
333 if (const char *buf =
334 SendCommand(/*is_data*/ true, info->module, info->module_offset)) {
335 ParseSymbolizeDataOutput(buf, info);
336 info->start += (addr - info->module_offset); // Add the base address.
342 const char *LLVMSymbolizer::SendCommand(bool is_data, const char *module_name,
343 uptr module_offset) {
345 internal_snprintf(buffer_, kBufferSize, "%s\"%s\" 0x%zx\n",
346 is_data ? "DATA " : "", module_name, module_offset);
347 return symbolizer_process_->SendCommand(buffer_);
350 SymbolizerProcess::SymbolizerProcess(const char *path, bool use_forkpty)
352 input_fd_(kInvalidFd),
353 output_fd_(kInvalidFd),
355 failed_to_start_(false),
356 reported_invalid_path_(false),
357 use_forkpty_(use_forkpty) {
359 CHECK_NE(path_[0], '\0');
362 const char *SymbolizerProcess::SendCommand(const char *command) {
363 for (; times_restarted_ < kMaxTimesRestarted; times_restarted_++) {
364 // Start or restart symbolizer if we failed to send command to it.
365 if (const char *res = SendCommandImpl(command))
369 if (!failed_to_start_) {
370 Report("WARNING: Failed to use and restart external symbolizer!\n");
371 failed_to_start_ = true;
376 const char *SymbolizerProcess::SendCommandImpl(const char *command) {
377 if (input_fd_ == kInvalidFd || output_fd_ == kInvalidFd)
379 if (!WriteToSymbolizer(command, internal_strlen(command)))
381 if (!ReadFromSymbolizer(buffer_, kBufferSize))
386 bool SymbolizerProcess::Restart() {
387 if (input_fd_ != kInvalidFd)
388 CloseFile(input_fd_);
389 if (output_fd_ != kInvalidFd)
390 CloseFile(output_fd_);
391 return StartSymbolizerSubprocess();
394 bool SymbolizerProcess::ReadFromSymbolizer(char *buffer, uptr max_length) {
400 bool success = ReadFromFile(input_fd_, buffer + read_len,
401 max_length - read_len - 1, &just_read);
402 // We can't read 0 bytes, as we don't expect external symbolizer to close
404 if (!success || just_read == 0) {
405 Report("WARNING: Can't read from symbolizer at fd %d\n", input_fd_);
408 read_len += just_read;
409 if (ReachedEndOfOutput(buffer, read_len))
412 buffer[read_len] = '\0';
416 bool SymbolizerProcess::WriteToSymbolizer(const char *buffer, uptr length) {
420 bool success = WriteToFile(output_fd_, buffer, length, &write_len);
421 if (!success || write_len != length) {
422 Report("WARNING: Can't write to symbolizer at fd %d\n", output_fd_);
428 } // namespace __sanitizer