#include "sanitizer_platform.h"
#if SANITIZER_WINDOWS
+#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <dbghelp.h>
#pragma comment(lib, "dbghelp.lib")
-#include "sanitizer_symbolizer.h"
+#include "sanitizer_symbolizer_internal.h"
namespace __sanitizer {
-class WinSymbolizer : public Symbolizer {
+namespace {
+
+class WinSymbolizerTool : public SymbolizerTool {
public:
- WinSymbolizer() : initialized_(false) {}
-
- uptr SymbolizePC(uptr addr, AddressInfo *frames, uptr max_frames) {
- if (max_frames == 0)
- return 0;
-
- BlockingMutexLock l(&dbghelp_mu_);
- if (!initialized_) {
- SymSetOptions(SYMOPT_DEFERRED_LOADS |
- SYMOPT_UNDNAME |
- SYMOPT_LOAD_LINES);
- CHECK(SymInitialize(GetCurrentProcess(), 0, TRUE));
- // FIXME: We don't call SymCleanup() on exit yet - should we?
- initialized_ = true;
- }
+ bool SymbolizePC(uptr addr, SymbolizedStack *stack) override;
+ bool SymbolizeData(uptr addr, DataInfo *info) override {
+ return false;
+ }
+ const char *Demangle(const char *name) override;
+};
- // 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 0;
-
- DWORD unused;
- IMAGEHLP_LINE64 line_info;
- line_info.SizeOfStruct = sizeof(IMAGEHLP_LINE64);
- BOOL got_fileline = SymGetLineFromAddr64(GetCurrentProcess(), (DWORD64)addr,
- &unused, &line_info);
- AddressInfo *info = &frames[0];
- info->Clear();
- info->function = internal_strdup(symbol->Name);
- info->function_offset = (uptr)offset;
- if (got_fileline) {
- info->file = internal_strdup(line_info.FileName);
- info->line = line_info.LineNumber;
- }
+bool is_dbghelp_initialized = false;
- IMAGEHLP_MODULE64 mod_info;
- internal_memset(&mod_info, 0, sizeof(mod_info));
- mod_info.SizeOfStruct = sizeof(mod_info);
- if (SymGetModuleInfo64(GetCurrentProcess(), addr, &mod_info))
- info->FillAddressAndModuleInfo(addr, mod_info.ImageName,
- addr - (uptr)mod_info.BaseOfImage);
- return 1;
+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?
+}
+
+// Initializes DbgHelp library, if it's not yet initialized. Calls to this
+// function should be synchronized with respect to other calls to DbgHelp API
+// (e.g. from WinSymbolizerTool).
+void InitializeDbgHelpIfNeeded() {
+ if (is_dbghelp_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();
+ }
+ is_dbghelp_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;
+ }
+}
+
+} // namespace
- bool CanReturnFileLineInfo() {
- return true;
+bool WinSymbolizerTool::SymbolizePC(uptr addr, SymbolizedStack *frame) {
+ InitializeDbgHelpIfNeeded();
+
+ // 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 false;
+
+ 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;
}
+ // Only consider this a successful symbolization attempt if we got file info.
+ // Otherwise, try llvm-symbolizer.
+ return got_fileline;
+}
- // FIXME: Implement GetModuleNameAndOffsetForPC().
+const char *WinSymbolizerTool::Demangle(const char *name) {
+ CHECK(is_dbghelp_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;
+}
+
+const char *Symbolizer::PlatformDemangle(const char *name) {
+ return name;
+}
+
+void Symbolizer::PlatformPrepareForSandboxing() {
+ // Do nothing.
+}
- private:
- // All DbgHelp functions are single threaded, so we should use a mutex to
- // serialize accesses.
- BlockingMutex dbghelp_mu_;
- bool initialized_;
+namespace {
+struct ScopedHandle {
+ ScopedHandle() : h_(nullptr) {}
+ explicit ScopedHandle(HANDLE h) : h_(h) {}
+ ~ScopedHandle() {
+ if (h_)
+ ::CloseHandle(h_);
+ }
+ HANDLE get() { return h_; }
+ HANDLE *receive() { return &h_; }
+ HANDLE release() {
+ HANDLE h = h_;
+ h_ = nullptr;
+ return h;
+ }
+ HANDLE h_;
};
+} // namespace
+
+bool SymbolizerProcess::StartSymbolizerSubprocess() {
+ // Create inherited pipes for stdin and stdout.
+ ScopedHandle stdin_read, stdin_write;
+ ScopedHandle stdout_read, stdout_write;
+ SECURITY_ATTRIBUTES attrs;
+ attrs.nLength = sizeof(SECURITY_ATTRIBUTES);
+ attrs.bInheritHandle = TRUE;
+ attrs.lpSecurityDescriptor = nullptr;
+ if (!::CreatePipe(stdin_read.receive(), stdin_write.receive(), &attrs, 0) ||
+ !::CreatePipe(stdout_read.receive(), stdout_write.receive(), &attrs, 0)) {
+ VReport(2, "WARNING: %s CreatePipe failed (error code: %d)\n",
+ SanitizerToolName, path_, GetLastError());
+ return false;
+ }
+
+ // Don't inherit the writing end of stdin or the reading end of stdout.
+ if (!SetHandleInformation(stdin_write.get(), HANDLE_FLAG_INHERIT, 0) ||
+ !SetHandleInformation(stdout_read.get(), HANDLE_FLAG_INHERIT, 0)) {
+ VReport(2, "WARNING: %s SetHandleInformation failed (error code: %d)\n",
+ SanitizerToolName, path_, GetLastError());
+ return false;
+ }
+
+ // Compute the command line. Wrap double quotes around everything.
+ const char *argv[kArgVMax];
+ GetArgV(path_, argv);
+ InternalScopedString command_line(kMaxPathLength * 3);
+ for (int i = 0; argv[i]; i++) {
+ const char *arg = argv[i];
+ int arglen = internal_strlen(arg);
+ // Check that tool command lines are simple and that complete escaping is
+ // unnecessary.
+ CHECK(!internal_strchr(arg, '"') && "quotes in args unsupported");
+ CHECK(!internal_strstr(arg, "\\\\") &&
+ "double backslashes in args unsupported");
+ CHECK(arglen > 0 && arg[arglen - 1] != '\\' &&
+ "args ending in backslash and empty args unsupported");
+ command_line.append("\"%s\" ", arg);
+ }
+ VReport(3, "Launching symbolizer command: %s\n", command_line.data());
+
+ // Launch llvm-symbolizer with stdin and stdout redirected.
+ STARTUPINFOA si;
+ memset(&si, 0, sizeof(si));
+ si.cb = sizeof(si);
+ si.dwFlags |= STARTF_USESTDHANDLES;
+ si.hStdInput = stdin_read.get();
+ si.hStdOutput = stdout_write.get();
+ PROCESS_INFORMATION pi;
+ memset(&pi, 0, sizeof(pi));
+ if (!CreateProcessA(path_, // Executable
+ command_line.data(), // Command line
+ nullptr, // Process handle not inheritable
+ nullptr, // Thread handle not inheritable
+ TRUE, // Set handle inheritance to TRUE
+ 0, // Creation flags
+ nullptr, // Use parent's environment block
+ nullptr, // Use parent's starting directory
+ &si, &pi)) {
+ VReport(2, "WARNING: %s failed to create process for %s (error code: %d)\n",
+ SanitizerToolName, path_, GetLastError());
+ return false;
+ }
+
+ // Process creation succeeded, so transfer handle ownership into the fields.
+ input_fd_ = stdout_read.release();
+ output_fd_ = stdin_write.release();
+
+ // The llvm-symbolizer process is responsible for quitting itself when the
+ // stdin pipe is closed, so we don't need these handles. Close them to prevent
+ // leaks. If we ever want to try to kill the symbolizer process from the
+ // parent, we'll want to hang on to these handles.
+ CloseHandle(pi.hProcess);
+ CloseHandle(pi.hThread);
+ return true;
+}
+
+static void ChooseSymbolizerTools(IntrusiveList<SymbolizerTool> *list,
+ LowLevelAllocator *allocator) {
+ if (!common_flags()->symbolize) {
+ VReport(2, "Symbolizer is disabled.\n");
+ return;
+ }
+
+ // Add llvm-symbolizer in case the binary has dwarf.
+ const char *user_path = common_flags()->external_symbolizer_path;
+ const char *path =
+ user_path ? user_path : FindPathToBinary("llvm-symbolizer.exe");
+ if (path) {
+ VReport(2, "Using llvm-symbolizer at %spath: %s\n",
+ user_path ? "user-specified " : "", path);
+ list->push_back(new(*allocator) LLVMSymbolizer(path, allocator));
+ } else {
+ if (user_path && user_path[0] == '\0') {
+ VReport(2, "External symbolizer is explicitly disabled.\n");
+ } else {
+ VReport(2, "External symbolizer is not present.\n");
+ }
+ }
+
+ // Add the dbghelp based symbolizer.
+ list->push_back(new(*allocator) WinSymbolizerTool());
+}
+
+Symbolizer *Symbolizer::PlatformInit() {
+ IntrusiveList<SymbolizerTool> list;
+ list.clear();
+ ChooseSymbolizerTools(&list, &symbolizer_allocator_);
-Symbolizer *Symbolizer::PlatformInit(const char *path_to_external) {
- static bool called_once = false;
- CHECK(!called_once && "Shouldn't create more than one symbolizer");
- called_once = true;
- return new(symbolizer_allocator_) WinSymbolizer();
+ return new(symbolizer_allocator_) Symbolizer(list);
}
} // namespace __sanitizer
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