+static bool checkFileCRC(StringRef Path, uint32_t CRCHash) {
+ ErrorOr<std::unique_ptr<MemoryBuffer>> MB =
+ MemoryBuffer::getFileOrSTDIN(Path);
+ if (!MB)
+ return false;
+ return !zlib::isAvailable() || CRCHash == zlib::crc32(MB.get()->getBuffer());
+}
+
+static bool findDebugBinary(const std::string &OrigPath,
+ const std::string &DebuglinkName, uint32_t CRCHash,
+ std::string &Result) {
+ std::string OrigRealPath = OrigPath;
+#if defined(HAVE_REALPATH)
+ if (char *RP = realpath(OrigPath.c_str(), nullptr)) {
+ OrigRealPath = RP;
+ free(RP);
+ }
+#endif
+ SmallString<16> OrigDir(OrigRealPath);
+ llvm::sys::path::remove_filename(OrigDir);
+ SmallString<16> DebugPath = OrigDir;
+ // Try /path/to/original_binary/debuglink_name
+ llvm::sys::path::append(DebugPath, DebuglinkName);
+ if (checkFileCRC(DebugPath, CRCHash)) {
+ Result = DebugPath.str();
+ return true;
+ }
+ // Try /path/to/original_binary/.debug/debuglink_name
+ DebugPath = OrigRealPath;
+ llvm::sys::path::append(DebugPath, ".debug", DebuglinkName);
+ if (checkFileCRC(DebugPath, CRCHash)) {
+ Result = DebugPath.str();
+ return true;
+ }
+ // Try /usr/lib/debug/path/to/original_binary/debuglink_name
+ DebugPath = "/usr/lib/debug";
+ llvm::sys::path::append(DebugPath, llvm::sys::path::relative_path(OrigDir),
+ DebuglinkName);
+ if (checkFileCRC(DebugPath, CRCHash)) {
+ Result = DebugPath.str();
+ return true;
+ }
+ return false;
+}
+
+static bool getGNUDebuglinkContents(const ObjectFile *Obj, std::string &DebugName,
+ uint32_t &CRCHash) {
+ if (!Obj)
+ return false;
+ for (const SectionRef &Section : Obj->sections()) {
+ StringRef Name;
+ Section.getName(Name);
+ Name = Name.substr(Name.find_first_not_of("._"));
+ if (Name == "gnu_debuglink") {
+ StringRef Data;
+ Section.getContents(Data);
+ DataExtractor DE(Data, Obj->isLittleEndian(), 0);
+ uint32_t Offset = 0;
+ if (const char *DebugNameStr = DE.getCStr(&Offset)) {
+ // 4-byte align the offset.
+ Offset = (Offset + 3) & ~0x3;
+ if (DE.isValidOffsetForDataOfSize(Offset, 4)) {
+ DebugName = DebugNameStr;
+ CRCHash = DE.getU32(&Offset);
+ return true;
+ }
+ }
+ break;
+ }
+ }
+ return false;
+}
+
+static
+bool darwinDsymMatchesBinary(const MachOObjectFile *DbgObj,
+ const MachOObjectFile *Obj) {
+ ArrayRef<uint8_t> dbg_uuid = DbgObj->getUuid();
+ ArrayRef<uint8_t> bin_uuid = Obj->getUuid();
+ if (dbg_uuid.empty() || bin_uuid.empty())
+ return false;
+ return !memcmp(dbg_uuid.data(), bin_uuid.data(), dbg_uuid.size());
+}
+
+ObjectFile *LLVMSymbolizer::lookUpDsymFile(const std::string &ExePath,
+ const MachOObjectFile *MachExeObj, const std::string &ArchName) {
+ // On Darwin we may find DWARF in separate object file in
+ // resource directory.
+ std::vector<std::string> DsymPaths;
+ StringRef Filename = sys::path::filename(ExePath);
+ DsymPaths.push_back(getDarwinDWARFResourceForPath(ExePath, Filename));
+ for (const auto &Path : Opts.DsymHints) {
+ DsymPaths.push_back(getDarwinDWARFResourceForPath(Path, Filename));
+ }
+ for (const auto &path : DsymPaths) {
+ ErrorOr<OwningBinary<Binary>> BinaryOrErr = createBinary(path);
+ std::error_code EC = BinaryOrErr.getError();
+ if (EC != errc::no_such_file_or_directory && !error(EC)) {
+ OwningBinary<Binary> B = std::move(BinaryOrErr.get());
+ ObjectFile *DbgObj =
+ getObjectFileFromBinary(B.getBinary(), ArchName);
+ const MachOObjectFile *MachDbgObj =
+ dyn_cast<const MachOObjectFile>(DbgObj);
+ if (!MachDbgObj) continue;
+ if (darwinDsymMatchesBinary(MachDbgObj, MachExeObj)) {
+ addOwningBinary(std::move(B));
+ return DbgObj;
+ }
+ }
+ }
+ return nullptr;
+}
+
+LLVMSymbolizer::ObjectPair
+LLVMSymbolizer::getOrCreateObjects(const std::string &Path,
+ const std::string &ArchName) {
+ const auto &I = ObjectPairForPathArch.find(std::make_pair(Path, ArchName));
+ if (I != ObjectPairForPathArch.end())
+ return I->second;
+ ObjectFile *Obj = nullptr;
+ ObjectFile *DbgObj = nullptr;
+ ErrorOr<OwningBinary<Binary>> BinaryOrErr = createBinary(Path);
+ if (!error(BinaryOrErr.getError())) {
+ OwningBinary<Binary> &B = BinaryOrErr.get();
+ Obj = getObjectFileFromBinary(B.getBinary(), ArchName);
+ if (!Obj) {
+ ObjectPair Res = std::make_pair(nullptr, nullptr);
+ ObjectPairForPathArch[std::make_pair(Path, ArchName)] = Res;
+ return Res;
+ }
+ addOwningBinary(std::move(B));
+ if (auto MachObj = dyn_cast<const MachOObjectFile>(Obj))
+ DbgObj = lookUpDsymFile(Path, MachObj, ArchName);
+ // Try to locate the debug binary using .gnu_debuglink section.
+ if (!DbgObj) {
+ std::string DebuglinkName;
+ uint32_t CRCHash;
+ std::string DebugBinaryPath;
+ if (getGNUDebuglinkContents(Obj, DebuglinkName, CRCHash) &&
+ findDebugBinary(Path, DebuglinkName, CRCHash, DebugBinaryPath)) {
+ BinaryOrErr = createBinary(DebugBinaryPath);
+ if (!error(BinaryOrErr.getError())) {
+ OwningBinary<Binary> B = std::move(BinaryOrErr.get());
+ DbgObj = getObjectFileFromBinary(B.getBinary(), ArchName);
+ addOwningBinary(std::move(B));
+ }
+ }
+ }
+ }
+ if (!DbgObj)
+ DbgObj = Obj;
+ ObjectPair Res = std::make_pair(Obj, DbgObj);
+ ObjectPairForPathArch[std::make_pair(Path, ArchName)] = Res;
+ return Res;
+}
+
+ObjectFile *
+LLVMSymbolizer::getObjectFileFromBinary(Binary *Bin,
+ const std::string &ArchName) {
+ if (!Bin)
+ return nullptr;
+ ObjectFile *Res = nullptr;
+ if (MachOUniversalBinary *UB = dyn_cast<MachOUniversalBinary>(Bin)) {
+ const auto &I = ObjectFileForArch.find(
+ std::make_pair(UB, ArchName));
+ if (I != ObjectFileForArch.end())
+ return I->second;
+ ErrorOr<std::unique_ptr<ObjectFile>> ParsedObj =
+ UB->getObjectForArch(ArchName);
+ if (ParsedObj) {
+ Res = ParsedObj.get().get();
+ ParsedBinariesAndObjects.push_back(std::move(ParsedObj.get()));
+ }
+ ObjectFileForArch[std::make_pair(UB, ArchName)] = Res;
+ } else if (Bin->isObject()) {
+ Res = cast<ObjectFile>(Bin);
+ }
+ return Res;
+}
+