| //===-- sanitizer_symbolizer_win.cc ---------------------------------------===// |
| // |
| // The LLVM Compiler Infrastructure |
| // |
| // 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. |
| // Windows-specific implementation of symbolizer parts. |
| //===----------------------------------------------------------------------===// |
| |
| #include "sanitizer_platform.h" |
| #if SANITIZER_WINDOWS |
| #include <windows.h> |
| #include <dbghelp.h> |
| #pragma comment(lib, "dbghelp.lib") |
| |
| #include "sanitizer_symbolizer.h" |
| |
| namespace __sanitizer { |
| |
| class WinSymbolizer : public Symbolizer { |
| public: |
| WinSymbolizer() : initialized_(false) {} |
| |
| SymbolizedStack *SymbolizePC(uptr addr) override { |
| SymbolizedStack *frame = SymbolizedStack::New(addr); |
| |
| BlockingMutexLock l(&dbghelp_mu_); |
| InitializeIfNeeded(); |
| |
| // See http://msdn.microsoft.com/en-us/library/ms680578(VS.85).aspx |
| char buffer[sizeof(SYMBOL_INFO) + MAX_SYM_NAME * sizeof(CHAR)]; |
| PSYMBOL_INFO symbol = (PSYMBOL_INFO)buffer; |
| symbol->SizeOfStruct = sizeof(SYMBOL_INFO); |
| symbol->MaxNameLen = MAX_SYM_NAME; |
| DWORD64 offset = 0; |
| BOOL got_objname = SymFromAddr(GetCurrentProcess(), |
| (DWORD64)addr, &offset, symbol); |
| if (!got_objname) |
| return frame; |
| |
| DWORD unused; |
| IMAGEHLP_LINE64 line_info; |
| line_info.SizeOfStruct = sizeof(IMAGEHLP_LINE64); |
| BOOL got_fileline = SymGetLineFromAddr64(GetCurrentProcess(), (DWORD64)addr, |
| &unused, &line_info); |
| frame->info.function = internal_strdup(symbol->Name); |
| frame->info.function_offset = (uptr)offset; |
| if (got_fileline) { |
| frame->info.file = internal_strdup(line_info.FileName); |
| frame->info.line = line_info.LineNumber; |
| } |
| |
| IMAGEHLP_MODULE64 mod_info; |
| internal_memset(&mod_info, 0, sizeof(mod_info)); |
| mod_info.SizeOfStruct = sizeof(mod_info); |
| if (SymGetModuleInfo64(GetCurrentProcess(), addr, &mod_info)) |
| frame->info.FillAddressAndModuleInfo(addr, mod_info.ImageName, |
| addr - (uptr)mod_info.BaseOfImage); |
| return frame; |
| } |
| |
| bool CanReturnFileLineInfo() override { |
| return true; |
| } |
| |
| const char *Demangle(const char *name) override { |
| CHECK(initialized_); |
| static char demangle_buffer[1000]; |
| if (name[0] == '\01' && |
| UnDecorateSymbolName(name + 1, demangle_buffer, sizeof(demangle_buffer), |
| UNDNAME_NAME_ONLY)) |
| return demangle_buffer; |
| else |
| return name; |
| } |
| |
| // FIXME: Implement GetModuleNameAndOffsetForPC(). |
| |
| private: |
| void InitializeIfNeeded() { |
| if (initialized_) |
| return; |
| if (!TrySymInitialize()) { |
| // OK, maybe the client app has called SymInitialize already. |
| // That's a bit unfortunate for us as all the DbgHelp functions are |
| // single-threaded and we can't coordinate with the app. |
| // FIXME: Can we stop the other threads at this point? |
| // Anyways, we have to reconfigure stuff to make sure that SymInitialize |
| // has all the appropriate options set. |
| // Cross our fingers and reinitialize DbgHelp. |
| Report("*** WARNING: Failed to initialize DbgHelp! ***\n"); |
| Report("*** Most likely this means that the app is already ***\n"); |
| Report("*** using DbgHelp, possibly with incompatible flags. ***\n"); |
| Report("*** Due to technical reasons, symbolization might crash ***\n"); |
| Report("*** or produce wrong results. ***\n"); |
| SymCleanup(GetCurrentProcess()); |
| TrySymInitialize(); |
| } |
| initialized_ = true; |
| |
| // When an executable is run from a location different from the one where it |
| // was originally built, we may not see the nearby PDB files. |
| // To work around this, let's append the directory of the main module |
| // to the symbol search path. All the failures below are not fatal. |
| const size_t kSymPathSize = 2048; |
| static wchar_t path_buffer[kSymPathSize + 1 + MAX_PATH]; |
| if (!SymGetSearchPathW(GetCurrentProcess(), path_buffer, kSymPathSize)) { |
| Report("*** WARNING: Failed to SymGetSearchPathW ***\n"); |
| return; |
| } |
| size_t sz = wcslen(path_buffer); |
| if (sz) { |
| CHECK_EQ(0, wcscat_s(path_buffer, L";")); |
| sz++; |
| } |
| DWORD res = GetModuleFileNameW(NULL, path_buffer + sz, MAX_PATH); |
| if (res == 0 || res == MAX_PATH) { |
| Report("*** WARNING: Failed to getting the EXE directory ***\n"); |
| return; |
| } |
| // Write the zero character in place of the last backslash to get the |
| // directory of the main module at the end of path_buffer. |
| wchar_t *last_bslash = wcsrchr(path_buffer + sz, L'\\'); |
| CHECK_NE(last_bslash, 0); |
| *last_bslash = L'\0'; |
| if (!SymSetSearchPathW(GetCurrentProcess(), path_buffer)) { |
| Report("*** WARNING: Failed to SymSetSearchPathW\n"); |
| return; |
| } |
| } |
| |
| bool TrySymInitialize() { |
| SymSetOptions(SYMOPT_DEFERRED_LOADS | SYMOPT_UNDNAME | SYMOPT_LOAD_LINES); |
| return SymInitialize(GetCurrentProcess(), 0, TRUE); |
| // FIXME: We don't call SymCleanup() on exit yet - should we? |
| } |
| |
| // All DbgHelp functions are single threaded, so we should use a mutex to |
| // serialize accesses. |
| BlockingMutex dbghelp_mu_; |
| bool initialized_; |
| }; |
| |
| Symbolizer *Symbolizer::PlatformInit() { |
| static bool called_once = false; |
| CHECK(!called_once && "Shouldn't create more than one symbolizer"); |
| called_once = true; |
| return new(symbolizer_allocator_) WinSymbolizer(); |
| } |
| |
| } // namespace __sanitizer |
| |
| #endif // _WIN32 |