1 //===- lib/DebugInfo/Symbolize/DIPrinter.cpp ------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 // 9 // This file defines the DIPrinter class, which is responsible for printing 10 // structures defined in DebugInfo/DIContext.h 11 // 12 //===----------------------------------------------------------------------===// 13 14 #include "llvm/DebugInfo/Symbolize/DIPrinter.h" 15 #include "llvm/ADT/StringRef.h" 16 #include "llvm/DebugInfo/DIContext.h" 17 #include "llvm/Support/ErrorOr.h" 18 #include "llvm/Support/Format.h" 19 #include "llvm/Support/MemoryBuffer.h" 20 #include "llvm/Support/raw_ostream.h" 21 #include <algorithm> 22 #include <cmath> 23 #include <cstddef> 24 #include <cstdint> 25 #include <memory> 26 #include <string> 27 28 namespace llvm { 29 namespace symbolize { 30 31 class SourceCode { 32 std::unique_ptr<MemoryBuffer> MemBuf; 33 34 std::optional<StringRef> 35 load(StringRef FileName, const std::optional<StringRef> &EmbeddedSource) { 36 if (Lines <= 0) 37 return std::nullopt; 38 39 if (EmbeddedSource) 40 return EmbeddedSource; 41 else { 42 ErrorOr<std::unique_ptr<MemoryBuffer>> BufOrErr = 43 MemoryBuffer::getFile(FileName); 44 if (!BufOrErr) 45 return std::nullopt; 46 MemBuf = std::move(*BufOrErr); 47 return MemBuf->getBuffer(); 48 } 49 } 50 51 std::optional<StringRef> pruneSource(const std::optional<StringRef> &Source) { 52 if (!Source) 53 return std::nullopt; 54 size_t FirstLinePos = StringRef::npos, Pos = 0; 55 for (int64_t L = 1; L <= LastLine; ++L, ++Pos) { 56 if (L == FirstLine) 57 FirstLinePos = Pos; 58 Pos = Source->find('\n', Pos); 59 if (Pos == StringRef::npos) 60 break; 61 } 62 if (FirstLinePos == StringRef::npos) 63 return std::nullopt; 64 return Source->substr(FirstLinePos, (Pos == StringRef::npos) 65 ? StringRef::npos 66 : Pos - FirstLinePos); 67 } 68 69 public: 70 const int64_t Line; 71 const int Lines; 72 const int64_t FirstLine; 73 const int64_t LastLine; 74 const std::optional<StringRef> PrunedSource; 75 76 SourceCode(StringRef FileName, int64_t Line, int Lines, 77 const std::optional<StringRef> &EmbeddedSource = 78 std::optional<StringRef>()) 79 : Line(Line), Lines(Lines), 80 FirstLine(std::max(static_cast<int64_t>(1), Line - Lines / 2)), 81 LastLine(FirstLine + Lines - 1), 82 PrunedSource(pruneSource(load(FileName, EmbeddedSource))) {} 83 84 void format(raw_ostream &OS) { 85 if (!PrunedSource) 86 return; 87 size_t MaxLineNumberWidth = std::ceil(std::log10(LastLine)); 88 int64_t L = FirstLine; 89 for (size_t Pos = 0; Pos < PrunedSource->size(); ++L) { 90 size_t PosEnd = PrunedSource->find('\n', Pos); 91 StringRef String = PrunedSource->substr( 92 Pos, (PosEnd == StringRef::npos) ? StringRef::npos : (PosEnd - Pos)); 93 if (String.endswith("\r")) 94 String = String.drop_back(1); 95 OS << format_decimal(L, MaxLineNumberWidth); 96 if (L == Line) 97 OS << " >: "; 98 else 99 OS << " : "; 100 OS << String << '\n'; 101 if (PosEnd == StringRef::npos) 102 break; 103 Pos = PosEnd + 1; 104 } 105 } 106 }; 107 108 void PlainPrinterBase::printHeader(uint64_t Address) { 109 if (Config.PrintAddress) { 110 OS << "0x"; 111 OS.write_hex(Address); 112 StringRef Delimiter = Config.Pretty ? ": " : "\n"; 113 OS << Delimiter; 114 } 115 } 116 117 // Prints source code around in the FileName the Line. 118 void PlainPrinterBase::printContext(SourceCode SourceCode) { 119 SourceCode.format(OS); 120 } 121 122 void PlainPrinterBase::printFunctionName(StringRef FunctionName, bool Inlined) { 123 if (Config.PrintFunctions) { 124 if (FunctionName == DILineInfo::BadString) 125 FunctionName = DILineInfo::Addr2LineBadString; 126 StringRef Delimiter = Config.Pretty ? " at " : "\n"; 127 StringRef Prefix = (Config.Pretty && Inlined) ? " (inlined by) " : ""; 128 OS << Prefix << FunctionName << Delimiter; 129 } 130 } 131 132 void LLVMPrinter::printSimpleLocation(StringRef Filename, 133 const DILineInfo &Info) { 134 OS << Filename << ':' << Info.Line << ':' << Info.Column << '\n'; 135 printContext( 136 SourceCode(Filename, Info.Line, Config.SourceContextLines, Info.Source)); 137 } 138 139 void GNUPrinter::printSimpleLocation(StringRef Filename, 140 const DILineInfo &Info) { 141 OS << Filename << ':' << Info.Line; 142 if (Info.Discriminator) 143 OS << " (discriminator " << Info.Discriminator << ')'; 144 OS << '\n'; 145 printContext( 146 SourceCode(Filename, Info.Line, Config.SourceContextLines, Info.Source)); 147 } 148 149 void PlainPrinterBase::printVerbose(StringRef Filename, 150 const DILineInfo &Info) { 151 OS << " Filename: " << Filename << '\n'; 152 if (Info.StartLine) { 153 OS << " Function start filename: " << Info.StartFileName << '\n'; 154 OS << " Function start line: " << Info.StartLine << '\n'; 155 } 156 printStartAddress(Info); 157 OS << " Line: " << Info.Line << '\n'; 158 OS << " Column: " << Info.Column << '\n'; 159 if (Info.Discriminator) 160 OS << " Discriminator: " << Info.Discriminator << '\n'; 161 } 162 163 void LLVMPrinter::printStartAddress(const DILineInfo &Info) { 164 if (Info.StartAddress) { 165 OS << " Function start address: 0x"; 166 OS.write_hex(*Info.StartAddress); 167 OS << '\n'; 168 } 169 } 170 171 void LLVMPrinter::printFooter() { OS << '\n'; } 172 173 void PlainPrinterBase::print(const DILineInfo &Info, bool Inlined) { 174 printFunctionName(Info.FunctionName, Inlined); 175 StringRef Filename = Info.FileName; 176 if (Filename == DILineInfo::BadString) 177 Filename = DILineInfo::Addr2LineBadString; 178 if (Config.Verbose) 179 printVerbose(Filename, Info); 180 else 181 printSimpleLocation(Filename, Info); 182 } 183 184 void PlainPrinterBase::print(const Request &Request, const DILineInfo &Info) { 185 printHeader(*Request.Address); 186 print(Info, false); 187 printFooter(); 188 } 189 190 void PlainPrinterBase::print(const Request &Request, 191 const DIInliningInfo &Info) { 192 printHeader(*Request.Address); 193 uint32_t FramesNum = Info.getNumberOfFrames(); 194 if (FramesNum == 0) 195 print(DILineInfo(), false); 196 else 197 for (uint32_t I = 0; I < FramesNum; ++I) 198 print(Info.getFrame(I), I > 0); 199 printFooter(); 200 } 201 202 void PlainPrinterBase::print(const Request &Request, const DIGlobal &Global) { 203 printHeader(*Request.Address); 204 StringRef Name = Global.Name; 205 if (Name == DILineInfo::BadString) 206 Name = DILineInfo::Addr2LineBadString; 207 OS << Name << "\n"; 208 OS << Global.Start << " " << Global.Size << "\n"; 209 if (Global.DeclFile.empty()) 210 OS << "??:?\n"; 211 else 212 OS << Global.DeclFile << ":" << Global.DeclLine << "\n"; 213 printFooter(); 214 } 215 216 void PlainPrinterBase::print(const Request &Request, 217 const std::vector<DILocal> &Locals) { 218 printHeader(*Request.Address); 219 if (Locals.empty()) 220 OS << DILineInfo::Addr2LineBadString << '\n'; 221 else 222 for (const DILocal &L : Locals) { 223 if (L.FunctionName.empty()) 224 OS << DILineInfo::Addr2LineBadString; 225 else 226 OS << L.FunctionName; 227 OS << '\n'; 228 229 if (L.Name.empty()) 230 OS << DILineInfo::Addr2LineBadString; 231 else 232 OS << L.Name; 233 OS << '\n'; 234 235 if (L.DeclFile.empty()) 236 OS << DILineInfo::Addr2LineBadString; 237 else 238 OS << L.DeclFile; 239 240 OS << ':' << L.DeclLine << '\n'; 241 242 if (L.FrameOffset) 243 OS << *L.FrameOffset; 244 else 245 OS << DILineInfo::Addr2LineBadString; 246 OS << ' '; 247 248 if (L.Size) 249 OS << *L.Size; 250 else 251 OS << DILineInfo::Addr2LineBadString; 252 OS << ' '; 253 254 if (L.TagOffset) 255 OS << *L.TagOffset; 256 else 257 OS << DILineInfo::Addr2LineBadString; 258 OS << '\n'; 259 } 260 printFooter(); 261 } 262 263 void PlainPrinterBase::printInvalidCommand(const Request &Request, 264 StringRef Command) { 265 OS << Command << '\n'; 266 } 267 268 bool PlainPrinterBase::printError(const Request &Request, 269 const ErrorInfoBase &ErrorInfo) { 270 ErrHandler(ErrorInfo, Request.ModuleName); 271 // Print an empty struct too. 272 return true; 273 } 274 275 static std::string toHex(uint64_t V) { 276 return ("0x" + Twine::utohexstr(V)).str(); 277 } 278 279 static json::Object toJSON(const Request &Request, StringRef ErrorMsg = "") { 280 json::Object Json({{"ModuleName", Request.ModuleName.str()}}); 281 if (Request.Address) 282 Json["Address"] = toHex(*Request.Address); 283 if (!ErrorMsg.empty()) 284 Json["Error"] = json::Object({{"Message", ErrorMsg.str()}}); 285 return Json; 286 } 287 288 static json::Object toJSON(const DILineInfo &LineInfo) { 289 return json::Object( 290 {{"FunctionName", LineInfo.FunctionName != DILineInfo::BadString 291 ? LineInfo.FunctionName 292 : ""}, 293 {"StartFileName", LineInfo.StartFileName != DILineInfo::BadString 294 ? LineInfo.StartFileName 295 : ""}, 296 {"StartLine", LineInfo.StartLine}, 297 {"StartAddress", 298 LineInfo.StartAddress ? toHex(*LineInfo.StartAddress) : ""}, 299 {"FileName", 300 LineInfo.FileName != DILineInfo::BadString ? LineInfo.FileName : ""}, 301 {"Line", LineInfo.Line}, 302 {"Column", LineInfo.Column}, 303 {"Discriminator", LineInfo.Discriminator}}); 304 } 305 306 void JSONPrinter::print(const Request &Request, const DILineInfo &Info) { 307 DIInliningInfo InliningInfo; 308 InliningInfo.addFrame(Info); 309 print(Request, InliningInfo); 310 } 311 312 void JSONPrinter::print(const Request &Request, const DIInliningInfo &Info) { 313 json::Array Array; 314 for (uint32_t I = 0, N = Info.getNumberOfFrames(); I < N; ++I) { 315 const DILineInfo &LineInfo = Info.getFrame(I); 316 json::Object Object = toJSON(LineInfo); 317 SourceCode SourceCode(LineInfo.FileName, LineInfo.Line, 318 Config.SourceContextLines, LineInfo.Source); 319 std::string FormattedSource; 320 raw_string_ostream Stream(FormattedSource); 321 SourceCode.format(Stream); 322 if (!FormattedSource.empty()) 323 Object["Source"] = std::move(FormattedSource); 324 Array.push_back(std::move(Object)); 325 } 326 json::Object Json = toJSON(Request); 327 Json["Symbol"] = std::move(Array); 328 if (ObjectList) 329 ObjectList->push_back(std::move(Json)); 330 else 331 printJSON(std::move(Json)); 332 } 333 334 void JSONPrinter::print(const Request &Request, const DIGlobal &Global) { 335 json::Object Data( 336 {{"Name", Global.Name != DILineInfo::BadString ? Global.Name : ""}, 337 {"Start", toHex(Global.Start)}, 338 {"Size", toHex(Global.Size)}}); 339 json::Object Json = toJSON(Request); 340 Json["Data"] = std::move(Data); 341 if (ObjectList) 342 ObjectList->push_back(std::move(Json)); 343 else 344 printJSON(std::move(Json)); 345 } 346 347 void JSONPrinter::print(const Request &Request, 348 const std::vector<DILocal> &Locals) { 349 json::Array Frame; 350 for (const DILocal &Local : Locals) { 351 json::Object FrameObject( 352 {{"FunctionName", Local.FunctionName}, 353 {"Name", Local.Name}, 354 {"DeclFile", Local.DeclFile}, 355 {"DeclLine", int64_t(Local.DeclLine)}, 356 {"Size", Local.Size ? toHex(*Local.Size) : ""}, 357 {"TagOffset", Local.TagOffset ? toHex(*Local.TagOffset) : ""}}); 358 if (Local.FrameOffset) 359 FrameObject["FrameOffset"] = *Local.FrameOffset; 360 Frame.push_back(std::move(FrameObject)); 361 } 362 json::Object Json = toJSON(Request); 363 Json["Frame"] = std::move(Frame); 364 if (ObjectList) 365 ObjectList->push_back(std::move(Json)); 366 else 367 printJSON(std::move(Json)); 368 } 369 370 void JSONPrinter::printInvalidCommand(const Request &Request, 371 StringRef Command) { 372 printError(Request, 373 StringError("unable to parse arguments: " + Command, 374 std::make_error_code(std::errc::invalid_argument))); 375 } 376 377 bool JSONPrinter::printError(const Request &Request, 378 const ErrorInfoBase &ErrorInfo) { 379 json::Object Json = toJSON(Request, ErrorInfo.message()); 380 if (ObjectList) 381 ObjectList->push_back(std::move(Json)); 382 else 383 printJSON(std::move(Json)); 384 return false; 385 } 386 387 void JSONPrinter::listBegin() { 388 assert(!ObjectList); 389 ObjectList = std::make_unique<json::Array>(); 390 } 391 392 void JSONPrinter::listEnd() { 393 assert(ObjectList); 394 printJSON(std::move(*ObjectList)); 395 ObjectList.reset(); 396 } 397 398 } // end namespace symbolize 399 } // end namespace llvm 400