| //===-- sanitizer_symbolizer_posix_libcdep.cc -----------------------------===// |
| // |
| // This file is distributed under the University of Illinois Open Source |
| // License. See LICENSE.TXT for details. |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file is shared between AddressSanitizer and ThreadSanitizer |
| // run-time libraries. |
| // POSIX-specific implementation of symbolizer parts. |
| //===----------------------------------------------------------------------===// |
| |
| #include "sanitizer_platform.h" |
| #if SANITIZER_POSIX |
| #include "sanitizer_allocator_internal.h" |
| #include "sanitizer_common.h" |
| #include "sanitizer_flags.h" |
| #include "sanitizer_internal_defs.h" |
| #include "sanitizer_linux.h" |
| #include "sanitizer_placement_new.h" |
| #include "sanitizer_procmaps.h" |
| #include "sanitizer_symbolizer.h" |
| #include "sanitizer_symbolizer_libbacktrace.h" |
| |
| #include <errno.h> |
| #include <stdlib.h> |
| #include <sys/wait.h> |
| #include <unistd.h> |
| |
| // C++ demangling function, as required by Itanium C++ ABI. This is weak, |
| // because we do not require a C++ ABI library to be linked to a program |
| // using sanitizers; if it's not present, we'll just use the mangled name. |
| namespace __cxxabiv1 { |
| extern "C" SANITIZER_WEAK_ATTRIBUTE |
| char *__cxa_demangle(const char *mangled, char *buffer, |
| size_t *length, int *status); |
| } |
| |
| namespace __sanitizer { |
| |
| // Attempts to demangle the name via __cxa_demangle from __cxxabiv1. |
| static const char *DemangleCXXABI(const char *name) { |
| // FIXME: __cxa_demangle aggressively insists on allocating memory. |
| // There's not much we can do about that, short of providing our |
| // own demangler (libc++abi's implementation could be adapted so that |
| // it does not allocate). For now, we just call it anyway, and we leak |
| // the returned value. |
| if (__cxxabiv1::__cxa_demangle) |
| if (const char *demangled_name = |
| __cxxabiv1::__cxa_demangle(name, 0, 0, 0)) |
| return demangled_name; |
| |
| return name; |
| } |
| |
| // Extracts the prefix of "str" that consists of any characters not |
| // present in "delims" string, and copies this prefix to "result", allocating |
| // space for it. |
| // Returns a pointer to "str" after skipping extracted prefix and first |
| // delimiter char. |
| static const char *ExtractToken(const char *str, const char *delims, |
| char **result) { |
| uptr prefix_len = internal_strcspn(str, delims); |
| *result = (char*)InternalAlloc(prefix_len + 1); |
| internal_memcpy(*result, str, prefix_len); |
| (*result)[prefix_len] = '\0'; |
| const char *prefix_end = str + prefix_len; |
| if (*prefix_end != '\0') prefix_end++; |
| return prefix_end; |
| } |
| |
| // Same as ExtractToken, but converts extracted token to integer. |
| static const char *ExtractInt(const char *str, const char *delims, |
| int *result) { |
| char *buff; |
| const char *ret = ExtractToken(str, delims, &buff); |
| if (buff != 0) { |
| *result = (int)internal_atoll(buff); |
| } |
| InternalFree(buff); |
| return ret; |
| } |
| |
| static const char *ExtractUptr(const char *str, const char *delims, |
| uptr *result) { |
| char *buff; |
| const char *ret = ExtractToken(str, delims, &buff); |
| if (buff != 0) { |
| *result = (uptr)internal_atoll(buff); |
| } |
| InternalFree(buff); |
| return ret; |
| } |
| |
| class ExternalSymbolizerInterface { |
| public: |
| // Can't declare pure virtual functions in sanitizer runtimes: |
| // __cxa_pure_virtual might be unavailable. |
| virtual char *SendCommand(bool is_data, const char *module_name, |
| uptr module_offset) { |
| UNIMPLEMENTED(); |
| } |
| }; |
| |
| // SymbolizerProcess encapsulates communication between the tool and |
| // external symbolizer program, running in a different subprocess. |
| // SymbolizerProcess may not be used from two threads simultaneously. |
| class SymbolizerProcess : public ExternalSymbolizerInterface { |
| public: |
| explicit SymbolizerProcess(const char *path) |
| : path_(path), |
| input_fd_(kInvalidFd), |
| output_fd_(kInvalidFd), |
| times_restarted_(0), |
| failed_to_start_(false), |
| reported_invalid_path_(false) { |
| CHECK(path_); |
| CHECK_NE(path_[0], '\0'); |
| } |
| |
| char *SendCommand(bool is_data, const char *module_name, uptr module_offset) { |
| for (; times_restarted_ < kMaxTimesRestarted; times_restarted_++) { |
| // Start or restart symbolizer if we failed to send command to it. |
| if (char *res = SendCommandImpl(is_data, module_name, module_offset)) |
| return res; |
| Restart(); |
| } |
| if (!failed_to_start_) { |
| Report("WARNING: Failed to use and restart external symbolizer!\n"); |
| failed_to_start_ = true; |
| } |
| return 0; |
| } |
| |
| private: |
| bool Restart() { |
| if (input_fd_ != kInvalidFd) |
| internal_close(input_fd_); |
| if (output_fd_ != kInvalidFd) |
| internal_close(output_fd_); |
| return StartSymbolizerSubprocess(); |
| } |
| |
| char *SendCommandImpl(bool is_data, const char *module_name, |
| uptr module_offset) { |
| if (input_fd_ == kInvalidFd || output_fd_ == kInvalidFd) |
| return 0; |
| CHECK(module_name); |
| if (!RenderInputCommand(buffer_, kBufferSize, is_data, module_name, |
| module_offset)) |
| return 0; |
| if (!writeToSymbolizer(buffer_, internal_strlen(buffer_))) |
| return 0; |
| if (!readFromSymbolizer(buffer_, kBufferSize)) |
| return 0; |
| return buffer_; |
| } |
| |
| bool readFromSymbolizer(char *buffer, uptr max_length) { |
| if (max_length == 0) |
| return true; |
| uptr read_len = 0; |
| while (true) { |
| uptr just_read = internal_read(input_fd_, buffer + read_len, |
| max_length - read_len - 1); |
| // We can't read 0 bytes, as we don't expect external symbolizer to close |
| // its stdout. |
| if (just_read == 0 || just_read == (uptr)-1) { |
| Report("WARNING: Can't read from symbolizer at fd %d\n", input_fd_); |
| return false; |
| } |
| read_len += just_read; |
| if (ReachedEndOfOutput(buffer, read_len)) |
| break; |
| } |
| buffer[read_len] = '\0'; |
| return true; |
| } |
| |
| bool writeToSymbolizer(const char *buffer, uptr length) { |
| if (length == 0) |
| return true; |
| uptr write_len = internal_write(output_fd_, buffer, length); |
| if (write_len == 0 || write_len == (uptr)-1) { |
| Report("WARNING: Can't write to symbolizer at fd %d\n", output_fd_); |
| return false; |
| } |
| return true; |
| } |
| |
| bool StartSymbolizerSubprocess() { |
| if (!FileExists(path_)) { |
| if (!reported_invalid_path_) { |
| Report("WARNING: invalid path to external symbolizer!\n"); |
| reported_invalid_path_ = true; |
| } |
| return false; |
| } |
| |
| int *infd = NULL; |
| int *outfd = NULL; |
| // The client program may close its stdin and/or stdout and/or stderr |
| // thus allowing socketpair to reuse file descriptors 0, 1 or 2. |
| // In this case the communication between the forked processes may be |
| // broken if either the parent or the child tries to close or duplicate |
| // these descriptors. The loop below produces two pairs of file |
| // descriptors, each greater than 2 (stderr). |
| int sock_pair[5][2]; |
| for (int i = 0; i < 5; i++) { |
| if (pipe(sock_pair[i]) == -1) { |
| for (int j = 0; j < i; j++) { |
| internal_close(sock_pair[j][0]); |
| internal_close(sock_pair[j][1]); |
| } |
| Report("WARNING: Can't create a socket pair to start " |
| "external symbolizer (errno: %d)\n", errno); |
| return false; |
| } else if (sock_pair[i][0] > 2 && sock_pair[i][1] > 2) { |
| if (infd == NULL) { |
| infd = sock_pair[i]; |
| } else { |
| outfd = sock_pair[i]; |
| for (int j = 0; j < i; j++) { |
| if (sock_pair[j] == infd) continue; |
| internal_close(sock_pair[j][0]); |
| internal_close(sock_pair[j][1]); |
| } |
| break; |
| } |
| } |
| } |
| CHECK(infd); |
| CHECK(outfd); |
| |
| // Real fork() may call user callbacks registered with pthread_atfork(). |
| int pid = internal_fork(); |
| if (pid == -1) { |
| // Fork() failed. |
| internal_close(infd[0]); |
| internal_close(infd[1]); |
| internal_close(outfd[0]); |
| internal_close(outfd[1]); |
| Report("WARNING: failed to fork external symbolizer " |
| " (errno: %d)\n", errno); |
| return false; |
| } else if (pid == 0) { |
| // Child subprocess. |
| internal_close(STDOUT_FILENO); |
| internal_close(STDIN_FILENO); |
| internal_dup2(outfd[0], STDIN_FILENO); |
| internal_dup2(infd[1], STDOUT_FILENO); |
| internal_close(outfd[0]); |
| internal_close(outfd[1]); |
| internal_close(infd[0]); |
| internal_close(infd[1]); |
| for (int fd = getdtablesize(); fd > 2; fd--) |
| internal_close(fd); |
| ExecuteWithDefaultArgs(path_); |
| internal__exit(1); |
| } |
| |
| // Continue execution in parent process. |
| internal_close(outfd[0]); |
| internal_close(infd[1]); |
| input_fd_ = infd[0]; |
| output_fd_ = outfd[1]; |
| |
| // Check that symbolizer subprocess started successfully. |
| int pid_status; |
| SleepForMillis(kSymbolizerStartupTimeMillis); |
| int exited_pid = waitpid(pid, &pid_status, WNOHANG); |
| if (exited_pid != 0) { |
| // Either waitpid failed, or child has already exited. |
| Report("WARNING: external symbolizer didn't start up correctly!\n"); |
| return false; |
| } |
| |
| return true; |
| } |
| |
| virtual bool RenderInputCommand(char *buffer, uptr max_length, bool is_data, |
| const char *module_name, |
| uptr module_offset) const { |
| UNIMPLEMENTED(); |
| } |
| |
| virtual bool ReachedEndOfOutput(const char *buffer, uptr length) const { |
| UNIMPLEMENTED(); |
| } |
| |
| virtual void ExecuteWithDefaultArgs(const char *path_to_binary) const { |
| UNIMPLEMENTED(); |
| } |
| |
| const char *path_; |
| int input_fd_; |
| int output_fd_; |
| |
| static const uptr kBufferSize = 16 * 1024; |
| char buffer_[kBufferSize]; |
| |
| static const uptr kMaxTimesRestarted = 5; |
| static const int kSymbolizerStartupTimeMillis = 10; |
| uptr times_restarted_; |
| bool failed_to_start_; |
| bool reported_invalid_path_; |
| }; |
| |
| // For now we assume the following protocol: |
| // For each request of the form |
| // <module_name> <module_offset> |
| // passed to STDIN, external symbolizer prints to STDOUT response: |
| // <function_name> |
| // <file_name>:<line_number>:<column_number> |
| // <function_name> |
| // <file_name>:<line_number>:<column_number> |
| // ... |
| // <empty line> |
| class LLVMSymbolizerProcess : public SymbolizerProcess { |
| public: |
| explicit LLVMSymbolizerProcess(const char *path) : SymbolizerProcess(path) {} |
| |
| private: |
| bool RenderInputCommand(char *buffer, uptr max_length, bool is_data, |
| const char *module_name, uptr module_offset) const { |
| internal_snprintf(buffer, max_length, "%s\"%s\" 0x%zx\n", |
| is_data ? "DATA " : "", module_name, module_offset); |
| return true; |
| } |
| |
| bool ReachedEndOfOutput(const char *buffer, uptr length) const { |
| // Empty line marks the end of llvm-symbolizer output. |
| return length >= 2 && buffer[length - 1] == '\n' && |
| buffer[length - 2] == '\n'; |
| } |
| |
| void ExecuteWithDefaultArgs(const char *path_to_binary) const { |
| #if defined(__x86_64__) |
| const char* const kSymbolizerArch = "--default-arch=x86_64"; |
| #elif defined(__i386__) |
| const char* const kSymbolizerArch = "--default-arch=i386"; |
| #elif defined(__powerpc64__) |
| const char* const kSymbolizerArch = "--default-arch=powerpc64"; |
| #else |
| const char* const kSymbolizerArch = "--default-arch=unknown"; |
| #endif |
| execl(path_to_binary, path_to_binary, kSymbolizerArch, (char *)0); |
| } |
| }; |
| |
| class Addr2LineProcess : public SymbolizerProcess { |
| public: |
| Addr2LineProcess(const char *path, const char *module_name) |
| : SymbolizerProcess(path), module_name_(internal_strdup(module_name)) {} |
| |
| const char *module_name() const { return module_name_; } |
| |
| private: |
| bool RenderInputCommand(char *buffer, uptr max_length, bool is_data, |
| const char *module_name, uptr module_offset) const { |
| if (is_data) |
| return false; |
| CHECK_EQ(0, internal_strcmp(module_name, module_name_)); |
| internal_snprintf(buffer, max_length, "0x%zx\n", module_offset); |
| return true; |
| } |
| |
| bool ReachedEndOfOutput(const char *buffer, uptr length) const { |
| // Output should consist of two lines. |
| int num_lines = 0; |
| for (uptr i = 0; i < length; ++i) { |
| if (buffer[i] == '\n') |
| num_lines++; |
| if (num_lines >= 2) |
| return true; |
| } |
| return false; |
| } |
| |
| void ExecuteWithDefaultArgs(const char *path_to_binary) const { |
| execl(path_to_binary, path_to_binary, "-Cfe", module_name_, (char *)0); |
| } |
| |
| const char *module_name_; // Owned, leaked. |
| }; |
| |
| class Addr2LinePool : public ExternalSymbolizerInterface { |
| public: |
| explicit Addr2LinePool(const char *addr2line_path, |
| LowLevelAllocator *allocator) |
| : addr2line_path_(addr2line_path), allocator_(allocator), |
| addr2line_pool_(16) {} |
| |
| char *SendCommand(bool is_data, const char *module_name, uptr module_offset) { |
| if (is_data) |
| return 0; |
| Addr2LineProcess *addr2line = 0; |
| for (uptr i = 0; i < addr2line_pool_.size(); ++i) { |
| if (0 == |
| internal_strcmp(module_name, addr2line_pool_[i]->module_name())) { |
| addr2line = addr2line_pool_[i]; |
| break; |
| } |
| } |
| if (!addr2line) { |
| addr2line = |
| new(*allocator_) Addr2LineProcess(addr2line_path_, module_name); |
| addr2line_pool_.push_back(addr2line); |
| } |
| return addr2line->SendCommand(is_data, module_name, module_offset); |
| } |
| |
| private: |
| const char *addr2line_path_; |
| LowLevelAllocator *allocator_; |
| InternalMmapVector<Addr2LineProcess*> addr2line_pool_; |
| }; |
| |
| #if SANITIZER_SUPPORTS_WEAK_HOOKS |
| extern "C" { |
| SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE |
| bool __sanitizer_symbolize_code(const char *ModuleName, u64 ModuleOffset, |
| char *Buffer, int MaxLength); |
| SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE |
| bool __sanitizer_symbolize_data(const char *ModuleName, u64 ModuleOffset, |
| char *Buffer, int MaxLength); |
| SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE |
| void __sanitizer_symbolize_flush(); |
| SANITIZER_INTERFACE_ATTRIBUTE SANITIZER_WEAK_ATTRIBUTE |
| int __sanitizer_symbolize_demangle(const char *Name, char *Buffer, |
| int MaxLength); |
| } // extern "C" |
| |
| class InternalSymbolizer { |
| public: |
| typedef bool (*SanitizerSymbolizeFn)(const char*, u64, char*, int); |
| |
| static InternalSymbolizer *get(LowLevelAllocator *alloc) { |
| if (__sanitizer_symbolize_code != 0 && |
| __sanitizer_symbolize_data != 0) { |
| return new(*alloc) InternalSymbolizer(); |
| } |
| return 0; |
| } |
| |
| char *SendCommand(bool is_data, const char *module_name, uptr module_offset) { |
| SanitizerSymbolizeFn symbolize_fn = is_data ? __sanitizer_symbolize_data |
| : __sanitizer_symbolize_code; |
| if (symbolize_fn(module_name, module_offset, buffer_, kBufferSize)) |
| return buffer_; |
| return 0; |
| } |
| |
| void Flush() { |
| if (__sanitizer_symbolize_flush) |
| __sanitizer_symbolize_flush(); |
| } |
| |
| const char *Demangle(const char *name) { |
| if (__sanitizer_symbolize_demangle) { |
| for (uptr res_length = 1024; |
| res_length <= InternalSizeClassMap::kMaxSize;) { |
| char *res_buff = static_cast<char*>(InternalAlloc(res_length)); |
| uptr req_length = |
| __sanitizer_symbolize_demangle(name, res_buff, res_length); |
| if (req_length > res_length) { |
| res_length = req_length + 1; |
| InternalFree(res_buff); |
| continue; |
| } |
| return res_buff; |
| } |
| } |
| return name; |
| } |
| |
| private: |
| InternalSymbolizer() { } |
| |
| static const int kBufferSize = 16 * 1024; |
| static const int kMaxDemangledNameSize = 1024; |
| char buffer_[kBufferSize]; |
| }; |
| #else // SANITIZER_SUPPORTS_WEAK_HOOKS |
| |
| class InternalSymbolizer { |
| public: |
| static InternalSymbolizer *get(LowLevelAllocator *alloc) { return 0; } |
| char *SendCommand(bool is_data, const char *module_name, uptr module_offset) { |
| return 0; |
| } |
| void Flush() { } |
| const char *Demangle(const char *name) { return name; } |
| }; |
| |
| #endif // SANITIZER_SUPPORTS_WEAK_HOOKS |
| |
| class POSIXSymbolizer : public Symbolizer { |
| public: |
| POSIXSymbolizer(ExternalSymbolizerInterface *external_symbolizer, |
| InternalSymbolizer *internal_symbolizer, |
| LibbacktraceSymbolizer *libbacktrace_symbolizer) |
| : Symbolizer(), |
| external_symbolizer_(external_symbolizer), |
| internal_symbolizer_(internal_symbolizer), |
| libbacktrace_symbolizer_(libbacktrace_symbolizer) {} |
| |
| uptr SymbolizePC(uptr addr, AddressInfo *frames, uptr max_frames) { |
| BlockingMutexLock l(&mu_); |
| if (max_frames == 0) |
| return 0; |
| const char *module_name; |
| uptr module_offset; |
| if (!FindModuleNameAndOffsetForAddress(addr, &module_name, &module_offset)) |
| return 0; |
| // First, try to use libbacktrace symbolizer (if it's available). |
| if (libbacktrace_symbolizer_ != 0) { |
| mu_.CheckLocked(); |
| uptr res = libbacktrace_symbolizer_->SymbolizeCode( |
| addr, frames, max_frames, module_name, module_offset); |
| if (res > 0) |
| return res; |
| } |
| const char *str = SendCommand(false, module_name, module_offset); |
| if (str == 0) { |
| // Symbolizer was not initialized or failed. Fill only data |
| // about module name and offset. |
| AddressInfo *info = &frames[0]; |
| info->Clear(); |
| info->FillAddressAndModuleInfo(addr, module_name, module_offset); |
| return 1; |
| } |
| uptr frame_id = 0; |
| for (frame_id = 0; frame_id < max_frames; frame_id++) { |
| AddressInfo *info = &frames[frame_id]; |
| char *function_name = 0; |
| str = ExtractToken(str, "\n", &function_name); |
| CHECK(function_name); |
| if (function_name[0] == '\0') { |
| // There are no more frames. |
| break; |
| } |
| info->Clear(); |
| info->FillAddressAndModuleInfo(addr, module_name, module_offset); |
| info->function = function_name; |
| // Parse <file>:<line>:<column> buffer. |
| char *file_line_info = 0; |
| str = ExtractToken(str, "\n", &file_line_info); |
| CHECK(file_line_info); |
| const char *line_info = ExtractToken(file_line_info, ":", &info->file); |
| line_info = ExtractInt(line_info, ":", &info->line); |
| line_info = ExtractInt(line_info, "", &info->column); |
| InternalFree(file_line_info); |
| |
| // Functions and filenames can be "??", in which case we write 0 |
| // to address info to mark that names are unknown. |
| if (0 == internal_strcmp(info->function, "??")) { |
| InternalFree(info->function); |
| info->function = 0; |
| } |
| if (0 == internal_strcmp(info->file, "??")) { |
| InternalFree(info->file); |
| info->file = 0; |
| } |
| } |
| if (frame_id == 0) { |
| // Make sure we return at least one frame. |
| AddressInfo *info = &frames[0]; |
| info->Clear(); |
| info->FillAddressAndModuleInfo(addr, module_name, module_offset); |
| frame_id = 1; |
| } |
| return frame_id; |
| } |
| |
| bool SymbolizeData(uptr addr, DataInfo *info) { |
| BlockingMutexLock l(&mu_); |
| LoadedModule *module = FindModuleForAddress(addr); |
| if (module == 0) |
| return false; |
| const char *module_name = module->full_name(); |
| uptr module_offset = addr - module->base_address(); |
| internal_memset(info, 0, sizeof(*info)); |
| info->address = addr; |
| info->module = internal_strdup(module_name); |
| info->module_offset = module_offset; |
| // First, try to use libbacktrace symbolizer (if it's available). |
| if (libbacktrace_symbolizer_ != 0) { |
| mu_.CheckLocked(); |
| if (libbacktrace_symbolizer_->SymbolizeData(info)) |
| return true; |
| } |
| const char *str = SendCommand(true, module_name, module_offset); |
| if (str == 0) |
| return true; |
| str = ExtractToken(str, "\n", &info->name); |
| str = ExtractUptr(str, " ", &info->start); |
| str = ExtractUptr(str, "\n", &info->size); |
| info->start += module->base_address(); |
| return true; |
| } |
| |
| bool GetModuleNameAndOffsetForPC(uptr pc, const char **module_name, |
| uptr *module_address) { |
| BlockingMutexLock l(&mu_); |
| return FindModuleNameAndOffsetForAddress(pc, module_name, module_address); |
| } |
| |
| bool CanReturnFileLineInfo() { |
| return internal_symbolizer_ != 0 || external_symbolizer_ != 0 || |
| libbacktrace_symbolizer_ != 0; |
| } |
| |
| void Flush() { |
| BlockingMutexLock l(&mu_); |
| if (internal_symbolizer_ != 0) { |
| SymbolizerScope sym_scope(this); |
| internal_symbolizer_->Flush(); |
| } |
| } |
| |
| const char *Demangle(const char *name) { |
| BlockingMutexLock l(&mu_); |
| // Run hooks even if we don't use internal symbolizer, as cxxabi |
| // demangle may call system functions. |
| SymbolizerScope sym_scope(this); |
| // Try to use libbacktrace demangler (if available). |
| if (libbacktrace_symbolizer_ != 0) { |
| if (const char *demangled = libbacktrace_symbolizer_->Demangle(name)) |
| return demangled; |
| } |
| if (internal_symbolizer_ != 0) |
| return internal_symbolizer_->Demangle(name); |
| return DemangleCXXABI(name); |
| } |
| |
| void PrepareForSandboxing() { |
| #if SANITIZER_LINUX && !SANITIZER_ANDROID |
| BlockingMutexLock l(&mu_); |
| // Cache /proc/self/exe on Linux. |
| CacheBinaryName(); |
| #endif |
| } |
| |
| private: |
| char *SendCommand(bool is_data, const char *module_name, uptr module_offset) { |
| mu_.CheckLocked(); |
| // First, try to use internal symbolizer. |
| if (internal_symbolizer_) { |
| SymbolizerScope sym_scope(this); |
| return internal_symbolizer_->SendCommand(is_data, module_name, |
| module_offset); |
| } |
| // Otherwise, fall back to external symbolizer. |
| if (external_symbolizer_) { |
| SymbolizerScope sym_scope(this); |
| return external_symbolizer_->SendCommand(is_data, module_name, |
| module_offset); |
| } |
| return 0; |
| } |
| |
| LoadedModule *FindModuleForAddress(uptr address) { |
| mu_.CheckLocked(); |
| bool modules_were_reloaded = false; |
| if (modules_ == 0 || !modules_fresh_) { |
| modules_ = (LoadedModule*)(symbolizer_allocator_.Allocate( |
| kMaxNumberOfModuleContexts * sizeof(LoadedModule))); |
| CHECK(modules_); |
| n_modules_ = GetListOfModules(modules_, kMaxNumberOfModuleContexts, |
| /* filter */ 0); |
| CHECK_GT(n_modules_, 0); |
| CHECK_LT(n_modules_, kMaxNumberOfModuleContexts); |
| modules_fresh_ = true; |
| modules_were_reloaded = true; |
| } |
| for (uptr i = 0; i < n_modules_; i++) { |
| if (modules_[i].containsAddress(address)) { |
| return &modules_[i]; |
| } |
| } |
| // Reload the modules and look up again, if we haven't tried it yet. |
| if (!modules_were_reloaded) { |
| // FIXME: set modules_fresh_ from dlopen()/dlclose() interceptors. |
| // It's too aggressive to reload the list of modules each time we fail |
| // to find a module for a given address. |
| modules_fresh_ = false; |
| return FindModuleForAddress(address); |
| } |
| return 0; |
| } |
| |
| bool FindModuleNameAndOffsetForAddress(uptr address, const char **module_name, |
| uptr *module_offset) { |
| mu_.CheckLocked(); |
| LoadedModule *module = FindModuleForAddress(address); |
| if (module == 0) |
| return false; |
| *module_name = module->full_name(); |
| *module_offset = address - module->base_address(); |
| return true; |
| } |
| |
| // 16K loaded modules should be enough for everyone. |
| static const uptr kMaxNumberOfModuleContexts = 1 << 14; |
| LoadedModule *modules_; // Array of module descriptions is leaked. |
| uptr n_modules_; |
| // If stale, need to reload the modules before looking up addresses. |
| bool modules_fresh_; |
| BlockingMutex mu_; |
| |
| ExternalSymbolizerInterface *external_symbolizer_; // Leaked. |
| InternalSymbolizer *const internal_symbolizer_; // Leaked. |
| LibbacktraceSymbolizer *libbacktrace_symbolizer_; // Leaked. |
| }; |
| |
| Symbolizer *Symbolizer::PlatformInit(const char *path_to_external) { |
| if (!common_flags()->symbolize) { |
| return new(symbolizer_allocator_) POSIXSymbolizer(0, 0, 0); |
| } |
| InternalSymbolizer* internal_symbolizer = |
| InternalSymbolizer::get(&symbolizer_allocator_); |
| ExternalSymbolizerInterface *external_symbolizer = 0; |
| LibbacktraceSymbolizer *libbacktrace_symbolizer = 0; |
| |
| if (!internal_symbolizer) { |
| libbacktrace_symbolizer = |
| LibbacktraceSymbolizer::get(&symbolizer_allocator_); |
| if (!libbacktrace_symbolizer) { |
| if (path_to_external && path_to_external[0] == '\0') { |
| // External symbolizer is explicitly disabled. Do nothing. |
| } else { |
| // Find path to llvm-symbolizer if it's not provided. |
| if (!path_to_external) |
| path_to_external = FindPathToBinary("llvm-symbolizer"); |
| if (path_to_external) { |
| external_symbolizer = new(symbolizer_allocator_) |
| LLVMSymbolizerProcess(path_to_external); |
| } else if (common_flags()->allow_addr2line) { |
| // If llvm-symbolizer is not found, try to use addr2line. |
| if (const char *addr2line_path = FindPathToBinary("addr2line")) { |
| external_symbolizer = new(symbolizer_allocator_) |
| Addr2LinePool(addr2line_path, &symbolizer_allocator_); |
| } |
| } |
| } |
| } |
| } |
| |
| return new(symbolizer_allocator_) POSIXSymbolizer( |
| external_symbolizer, internal_symbolizer, libbacktrace_symbolizer); |
| } |
| |
| } // namespace __sanitizer |
| |
| #endif // SANITIZER_POSIX |
