1 //===- DWARFDebugFrame.h - Parsing of .debug_frame ------------------------===// 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 #include "llvm/DebugInfo/DWARF/DWARFDebugFrame.h" 10 #include "llvm/ADT/DenseMap.h" 11 #include "llvm/ADT/Optional.h" 12 #include "llvm/ADT/StringExtras.h" 13 #include "llvm/ADT/StringRef.h" 14 #include "llvm/BinaryFormat/Dwarf.h" 15 #include "llvm/Support/Casting.h" 16 #include "llvm/Support/Compiler.h" 17 #include "llvm/Support/DataExtractor.h" 18 #include "llvm/Support/Errc.h" 19 #include "llvm/Support/ErrorHandling.h" 20 #include "llvm/Support/Format.h" 21 #include "llvm/Support/raw_ostream.h" 22 #include <algorithm> 23 #include <cassert> 24 #include <cinttypes> 25 #include <cstdint> 26 #include <string> 27 #include <vector> 28 29 using namespace llvm; 30 using namespace dwarf; 31 32 33 // See DWARF standard v3, section 7.23 34 const uint8_t DWARF_CFI_PRIMARY_OPCODE_MASK = 0xc0; 35 const uint8_t DWARF_CFI_PRIMARY_OPERAND_MASK = 0x3f; 36 37 Error CFIProgram::parse(DWARFDataExtractor Data, uint64_t *Offset, 38 uint64_t EndOffset) { 39 DataExtractor::Cursor C(*Offset); 40 while (C && C.tell() < EndOffset) { 41 uint8_t Opcode = Data.getRelocatedValue(C, 1); 42 if (!C) 43 break; 44 45 // Some instructions have a primary opcode encoded in the top bits. 46 if (uint8_t Primary = Opcode & DWARF_CFI_PRIMARY_OPCODE_MASK) { 47 // If it's a primary opcode, the first operand is encoded in the bottom 48 // bits of the opcode itself. 49 uint64_t Op1 = Opcode & DWARF_CFI_PRIMARY_OPERAND_MASK; 50 switch (Primary) { 51 case DW_CFA_advance_loc: 52 case DW_CFA_restore: 53 addInstruction(Primary, Op1); 54 break; 55 case DW_CFA_offset: 56 addInstruction(Primary, Op1, Data.getULEB128(C)); 57 break; 58 default: 59 llvm_unreachable("invalid primary CFI opcode"); 60 } 61 continue; 62 } 63 64 // Extended opcode - its value is Opcode itself. 65 switch (Opcode) { 66 default: 67 return createStringError(errc::illegal_byte_sequence, 68 "invalid extended CFI opcode 0x%" PRIx8, Opcode); 69 case DW_CFA_nop: 70 case DW_CFA_remember_state: 71 case DW_CFA_restore_state: 72 case DW_CFA_GNU_window_save: 73 // No operands 74 addInstruction(Opcode); 75 break; 76 case DW_CFA_set_loc: 77 // Operands: Address 78 addInstruction(Opcode, Data.getRelocatedAddress(C)); 79 break; 80 case DW_CFA_advance_loc1: 81 // Operands: 1-byte delta 82 addInstruction(Opcode, Data.getRelocatedValue(C, 1)); 83 break; 84 case DW_CFA_advance_loc2: 85 // Operands: 2-byte delta 86 addInstruction(Opcode, Data.getRelocatedValue(C, 2)); 87 break; 88 case DW_CFA_advance_loc4: 89 // Operands: 4-byte delta 90 addInstruction(Opcode, Data.getRelocatedValue(C, 4)); 91 break; 92 case DW_CFA_restore_extended: 93 case DW_CFA_undefined: 94 case DW_CFA_same_value: 95 case DW_CFA_def_cfa_register: 96 case DW_CFA_def_cfa_offset: 97 case DW_CFA_GNU_args_size: 98 // Operands: ULEB128 99 addInstruction(Opcode, Data.getULEB128(C)); 100 break; 101 case DW_CFA_def_cfa_offset_sf: 102 // Operands: SLEB128 103 addInstruction(Opcode, Data.getSLEB128(C)); 104 break; 105 case DW_CFA_offset_extended: 106 case DW_CFA_register: 107 case DW_CFA_def_cfa: 108 case DW_CFA_val_offset: { 109 // Operands: ULEB128, ULEB128 110 // Note: We can not embed getULEB128 directly into function 111 // argument list. getULEB128 changes Offset and order of evaluation 112 // for arguments is unspecified. 113 uint64_t op1 = Data.getULEB128(C); 114 uint64_t op2 = Data.getULEB128(C); 115 addInstruction(Opcode, op1, op2); 116 break; 117 } 118 case DW_CFA_offset_extended_sf: 119 case DW_CFA_def_cfa_sf: 120 case DW_CFA_val_offset_sf: { 121 // Operands: ULEB128, SLEB128 122 // Note: see comment for the previous case 123 uint64_t op1 = Data.getULEB128(C); 124 uint64_t op2 = (uint64_t)Data.getSLEB128(C); 125 addInstruction(Opcode, op1, op2); 126 break; 127 } 128 case DW_CFA_def_cfa_expression: { 129 uint64_t ExprLength = Data.getULEB128(C); 130 addInstruction(Opcode, 0); 131 StringRef Expression = Data.getBytes(C, ExprLength); 132 133 DataExtractor Extractor(Expression, Data.isLittleEndian(), 134 Data.getAddressSize()); 135 // Note. We do not pass the DWARF format to DWARFExpression, because 136 // DW_OP_call_ref, the only operation which depends on the format, is 137 // prohibited in call frame instructions, see sec. 6.4.2 in DWARFv5. 138 Instructions.back().Expression = 139 DWARFExpression(Extractor, Data.getAddressSize()); 140 break; 141 } 142 case DW_CFA_expression: 143 case DW_CFA_val_expression: { 144 uint64_t RegNum = Data.getULEB128(C); 145 addInstruction(Opcode, RegNum, 0); 146 147 uint64_t BlockLength = Data.getULEB128(C); 148 StringRef Expression = Data.getBytes(C, BlockLength); 149 DataExtractor Extractor(Expression, Data.isLittleEndian(), 150 Data.getAddressSize()); 151 // Note. We do not pass the DWARF format to DWARFExpression, because 152 // DW_OP_call_ref, the only operation which depends on the format, is 153 // prohibited in call frame instructions, see sec. 6.4.2 in DWARFv5. 154 Instructions.back().Expression = 155 DWARFExpression(Extractor, Data.getAddressSize()); 156 break; 157 } 158 } 159 } 160 161 *Offset = C.tell(); 162 return C.takeError(); 163 } 164 165 namespace { 166 167 168 } // end anonymous namespace 169 170 ArrayRef<CFIProgram::OperandType[2]> CFIProgram::getOperandTypes() { 171 static OperandType OpTypes[DW_CFA_restore+1][2]; 172 static bool Initialized = false; 173 if (Initialized) { 174 return ArrayRef<OperandType[2]>(&OpTypes[0], DW_CFA_restore+1); 175 } 176 Initialized = true; 177 178 #define DECLARE_OP2(OP, OPTYPE0, OPTYPE1) \ 179 do { \ 180 OpTypes[OP][0] = OPTYPE0; \ 181 OpTypes[OP][1] = OPTYPE1; \ 182 } while (false) 183 #define DECLARE_OP1(OP, OPTYPE0) DECLARE_OP2(OP, OPTYPE0, OT_None) 184 #define DECLARE_OP0(OP) DECLARE_OP1(OP, OT_None) 185 186 DECLARE_OP1(DW_CFA_set_loc, OT_Address); 187 DECLARE_OP1(DW_CFA_advance_loc, OT_FactoredCodeOffset); 188 DECLARE_OP1(DW_CFA_advance_loc1, OT_FactoredCodeOffset); 189 DECLARE_OP1(DW_CFA_advance_loc2, OT_FactoredCodeOffset); 190 DECLARE_OP1(DW_CFA_advance_loc4, OT_FactoredCodeOffset); 191 DECLARE_OP1(DW_CFA_MIPS_advance_loc8, OT_FactoredCodeOffset); 192 DECLARE_OP2(DW_CFA_def_cfa, OT_Register, OT_Offset); 193 DECLARE_OP2(DW_CFA_def_cfa_sf, OT_Register, OT_SignedFactDataOffset); 194 DECLARE_OP1(DW_CFA_def_cfa_register, OT_Register); 195 DECLARE_OP1(DW_CFA_def_cfa_offset, OT_Offset); 196 DECLARE_OP1(DW_CFA_def_cfa_offset_sf, OT_SignedFactDataOffset); 197 DECLARE_OP1(DW_CFA_def_cfa_expression, OT_Expression); 198 DECLARE_OP1(DW_CFA_undefined, OT_Register); 199 DECLARE_OP1(DW_CFA_same_value, OT_Register); 200 DECLARE_OP2(DW_CFA_offset, OT_Register, OT_UnsignedFactDataOffset); 201 DECLARE_OP2(DW_CFA_offset_extended, OT_Register, OT_UnsignedFactDataOffset); 202 DECLARE_OP2(DW_CFA_offset_extended_sf, OT_Register, OT_SignedFactDataOffset); 203 DECLARE_OP2(DW_CFA_val_offset, OT_Register, OT_UnsignedFactDataOffset); 204 DECLARE_OP2(DW_CFA_val_offset_sf, OT_Register, OT_SignedFactDataOffset); 205 DECLARE_OP2(DW_CFA_register, OT_Register, OT_Register); 206 DECLARE_OP2(DW_CFA_expression, OT_Register, OT_Expression); 207 DECLARE_OP2(DW_CFA_val_expression, OT_Register, OT_Expression); 208 DECLARE_OP1(DW_CFA_restore, OT_Register); 209 DECLARE_OP1(DW_CFA_restore_extended, OT_Register); 210 DECLARE_OP0(DW_CFA_remember_state); 211 DECLARE_OP0(DW_CFA_restore_state); 212 DECLARE_OP0(DW_CFA_GNU_window_save); 213 DECLARE_OP1(DW_CFA_GNU_args_size, OT_Offset); 214 DECLARE_OP0(DW_CFA_nop); 215 216 #undef DECLARE_OP0 217 #undef DECLARE_OP1 218 #undef DECLARE_OP2 219 220 return ArrayRef<OperandType[2]>(&OpTypes[0], DW_CFA_restore+1); 221 } 222 223 /// Print \p Opcode's operand number \p OperandIdx which has value \p Operand. 224 void CFIProgram::printOperand(raw_ostream &OS, const MCRegisterInfo *MRI, 225 bool IsEH, const Instruction &Instr, 226 unsigned OperandIdx, uint64_t Operand) const { 227 assert(OperandIdx < 2); 228 uint8_t Opcode = Instr.Opcode; 229 OperandType Type = getOperandTypes()[Opcode][OperandIdx]; 230 231 switch (Type) { 232 case OT_Unset: { 233 OS << " Unsupported " << (OperandIdx ? "second" : "first") << " operand to"; 234 auto OpcodeName = CallFrameString(Opcode, Arch); 235 if (!OpcodeName.empty()) 236 OS << " " << OpcodeName; 237 else 238 OS << format(" Opcode %x", Opcode); 239 break; 240 } 241 case OT_None: 242 break; 243 case OT_Address: 244 OS << format(" %" PRIx64, Operand); 245 break; 246 case OT_Offset: 247 // The offsets are all encoded in a unsigned form, but in practice 248 // consumers use them signed. It's most certainly legacy due to 249 // the lack of signed variants in the first Dwarf standards. 250 OS << format(" %+" PRId64, int64_t(Operand)); 251 break; 252 case OT_FactoredCodeOffset: // Always Unsigned 253 if (CodeAlignmentFactor) 254 OS << format(" %" PRId64, Operand * CodeAlignmentFactor); 255 else 256 OS << format(" %" PRId64 "*code_alignment_factor" , Operand); 257 break; 258 case OT_SignedFactDataOffset: 259 if (DataAlignmentFactor) 260 OS << format(" %" PRId64, int64_t(Operand) * DataAlignmentFactor); 261 else 262 OS << format(" %" PRId64 "*data_alignment_factor" , int64_t(Operand)); 263 break; 264 case OT_UnsignedFactDataOffset: 265 if (DataAlignmentFactor) 266 OS << format(" %" PRId64, Operand * DataAlignmentFactor); 267 else 268 OS << format(" %" PRId64 "*data_alignment_factor" , Operand); 269 break; 270 case OT_Register: 271 OS << format(" reg%" PRId64, Operand); 272 break; 273 case OT_Expression: 274 assert(Instr.Expression && "missing DWARFExpression object"); 275 OS << " "; 276 Instr.Expression->print(OS, MRI, nullptr, IsEH); 277 break; 278 } 279 } 280 281 void CFIProgram::dump(raw_ostream &OS, const MCRegisterInfo *MRI, bool IsEH, 282 unsigned IndentLevel) const { 283 for (const auto &Instr : Instructions) { 284 uint8_t Opcode = Instr.Opcode; 285 if (Opcode & DWARF_CFI_PRIMARY_OPCODE_MASK) 286 Opcode &= DWARF_CFI_PRIMARY_OPCODE_MASK; 287 OS.indent(2 * IndentLevel); 288 OS << CallFrameString(Opcode, Arch) << ":"; 289 for (unsigned i = 0; i < Instr.Ops.size(); ++i) 290 printOperand(OS, MRI, IsEH, Instr, i, Instr.Ops[i]); 291 OS << '\n'; 292 } 293 } 294 295 // Returns the CIE identifier to be used by the requested format. 296 // CIE ids for .debug_frame sections are defined in Section 7.24 of DWARFv5. 297 // For CIE ID in .eh_frame sections see 298 // https://refspecs.linuxfoundation.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/ehframechpt.html 299 constexpr uint64_t getCIEId(bool IsDWARF64, bool IsEH) { 300 if (IsEH) 301 return 0; 302 if (IsDWARF64) 303 return DW64_CIE_ID; 304 return DW_CIE_ID; 305 } 306 307 void CIE::dump(raw_ostream &OS, const MCRegisterInfo *MRI, bool IsEH) const { 308 // A CIE with a zero length is a terminator entry in the .eh_frame section. 309 if (IsEH && Length == 0) { 310 OS << format("%08" PRIx64, Offset) << " ZERO terminator\n"; 311 return; 312 } 313 314 OS << format("%08" PRIx64, Offset) 315 << format(" %0*" PRIx64, IsDWARF64 ? 16 : 8, Length) 316 << format(" %0*" PRIx64, IsDWARF64 && !IsEH ? 16 : 8, 317 getCIEId(IsDWARF64, IsEH)) 318 << " CIE\n" 319 << " Format: " << FormatString(IsDWARF64) << "\n" 320 << format(" Version: %d\n", Version) 321 << " Augmentation: \"" << Augmentation << "\"\n"; 322 if (Version >= 4) { 323 OS << format(" Address size: %u\n", (uint32_t)AddressSize); 324 OS << format(" Segment desc size: %u\n", 325 (uint32_t)SegmentDescriptorSize); 326 } 327 OS << format(" Code alignment factor: %u\n", (uint32_t)CodeAlignmentFactor); 328 OS << format(" Data alignment factor: %d\n", (int32_t)DataAlignmentFactor); 329 OS << format(" Return address column: %d\n", (int32_t)ReturnAddressRegister); 330 if (Personality) 331 OS << format(" Personality Address: %016" PRIx64 "\n", *Personality); 332 if (!AugmentationData.empty()) { 333 OS << " Augmentation data: "; 334 for (uint8_t Byte : AugmentationData) 335 OS << ' ' << hexdigit(Byte >> 4) << hexdigit(Byte & 0xf); 336 OS << "\n"; 337 } 338 OS << "\n"; 339 CFIs.dump(OS, MRI, IsEH); 340 OS << "\n"; 341 } 342 343 void FDE::dump(raw_ostream &OS, const MCRegisterInfo *MRI, bool IsEH) const { 344 OS << format("%08" PRIx64, Offset) 345 << format(" %0*" PRIx64, IsDWARF64 ? 16 : 8, Length) 346 << format(" %0*" PRIx64, IsDWARF64 && !IsEH ? 16 : 8, CIEPointer) 347 << " FDE cie="; 348 if (LinkedCIE) 349 OS << format("%08" PRIx64, LinkedCIE->getOffset()); 350 else 351 OS << "<invalid offset>"; 352 OS << format(" pc=%08" PRIx64 "...%08" PRIx64 "\n", InitialLocation, 353 InitialLocation + AddressRange); 354 OS << " Format: " << FormatString(IsDWARF64) << "\n"; 355 if (LSDAAddress) 356 OS << format(" LSDA Address: %016" PRIx64 "\n", *LSDAAddress); 357 CFIs.dump(OS, MRI, IsEH); 358 OS << "\n"; 359 } 360 361 DWARFDebugFrame::DWARFDebugFrame(Triple::ArchType Arch, 362 bool IsEH, uint64_t EHFrameAddress) 363 : Arch(Arch), IsEH(IsEH), EHFrameAddress(EHFrameAddress) {} 364 365 DWARFDebugFrame::~DWARFDebugFrame() = default; 366 367 static void LLVM_ATTRIBUTE_UNUSED dumpDataAux(DataExtractor Data, 368 uint64_t Offset, int Length) { 369 errs() << "DUMP: "; 370 for (int i = 0; i < Length; ++i) { 371 uint8_t c = Data.getU8(&Offset); 372 errs().write_hex(c); errs() << " "; 373 } 374 errs() << "\n"; 375 } 376 377 Error DWARFDebugFrame::parse(DWARFDataExtractor Data) { 378 uint64_t Offset = 0; 379 DenseMap<uint64_t, CIE *> CIEs; 380 381 while (Data.isValidOffset(Offset)) { 382 uint64_t StartOffset = Offset; 383 384 uint64_t Length; 385 DwarfFormat Format; 386 std::tie(Length, Format) = Data.getInitialLength(&Offset); 387 bool IsDWARF64 = Format == DWARF64; 388 389 // If the Length is 0, then this CIE is a terminator. We add it because some 390 // dumper tools might need it to print something special for such entries 391 // (e.g. llvm-objdump --dwarf=frames prints "ZERO terminator"). 392 if (Length == 0) { 393 auto Cie = std::make_unique<CIE>( 394 IsDWARF64, StartOffset, 0, 0, SmallString<8>(), 0, 0, 0, 0, 0, 395 SmallString<8>(), 0, 0, None, None, Arch); 396 CIEs[StartOffset] = Cie.get(); 397 Entries.push_back(std::move(Cie)); 398 break; 399 } 400 401 // At this point, Offset points to the next field after Length. 402 // Length is the structure size excluding itself. Compute an offset one 403 // past the end of the structure (needed to know how many instructions to 404 // read). 405 uint64_t StartStructureOffset = Offset; 406 uint64_t EndStructureOffset = Offset + Length; 407 408 // The Id field's size depends on the DWARF format 409 Error Err = Error::success(); 410 uint64_t Id = Data.getRelocatedValue((IsDWARF64 && !IsEH) ? 8 : 4, &Offset, 411 /*SectionIndex=*/nullptr, &Err); 412 if (Err) 413 return Err; 414 415 if (Id == getCIEId(IsDWARF64, IsEH)) { 416 uint8_t Version = Data.getU8(&Offset); 417 const char *Augmentation = Data.getCStr(&Offset); 418 StringRef AugmentationString(Augmentation ? Augmentation : ""); 419 // TODO: we should provide a way to report a warning and continue dumping. 420 if (IsEH && Version != 1) 421 return createStringError(errc::not_supported, 422 "unsupported CIE version: %" PRIu8, Version); 423 424 uint8_t AddressSize = Version < 4 ? Data.getAddressSize() : 425 Data.getU8(&Offset); 426 Data.setAddressSize(AddressSize); 427 uint8_t SegmentDescriptorSize = Version < 4 ? 0 : Data.getU8(&Offset); 428 uint64_t CodeAlignmentFactor = Data.getULEB128(&Offset); 429 int64_t DataAlignmentFactor = Data.getSLEB128(&Offset); 430 uint64_t ReturnAddressRegister = 431 Version == 1 ? Data.getU8(&Offset) : Data.getULEB128(&Offset); 432 433 // Parse the augmentation data for EH CIEs 434 StringRef AugmentationData(""); 435 uint32_t FDEPointerEncoding = DW_EH_PE_absptr; 436 uint32_t LSDAPointerEncoding = DW_EH_PE_omit; 437 Optional<uint64_t> Personality; 438 Optional<uint32_t> PersonalityEncoding; 439 if (IsEH) { 440 Optional<uint64_t> AugmentationLength; 441 uint64_t StartAugmentationOffset; 442 uint64_t EndAugmentationOffset; 443 444 // Walk the augmentation string to get all the augmentation data. 445 for (unsigned i = 0, e = AugmentationString.size(); i != e; ++i) { 446 switch (AugmentationString[i]) { 447 default: 448 return createStringError( 449 errc::invalid_argument, 450 "unknown augmentation character in entry at 0x%" PRIx64, 451 StartOffset); 452 case 'L': 453 LSDAPointerEncoding = Data.getU8(&Offset); 454 break; 455 case 'P': { 456 if (Personality) 457 return createStringError( 458 errc::invalid_argument, 459 "duplicate personality in entry at 0x%" PRIx64, StartOffset); 460 PersonalityEncoding = Data.getU8(&Offset); 461 Personality = Data.getEncodedPointer( 462 &Offset, *PersonalityEncoding, 463 EHFrameAddress ? EHFrameAddress + Offset : 0); 464 break; 465 } 466 case 'R': 467 FDEPointerEncoding = Data.getU8(&Offset); 468 break; 469 case 'S': 470 // Current frame is a signal trampoline. 471 break; 472 case 'z': 473 if (i) 474 return createStringError( 475 errc::invalid_argument, 476 "'z' must be the first character at 0x%" PRIx64, StartOffset); 477 // Parse the augmentation length first. We only parse it if 478 // the string contains a 'z'. 479 AugmentationLength = Data.getULEB128(&Offset); 480 StartAugmentationOffset = Offset; 481 EndAugmentationOffset = Offset + *AugmentationLength; 482 break; 483 case 'B': 484 // B-Key is used for signing functions associated with this 485 // augmentation string 486 break; 487 } 488 } 489 490 if (AugmentationLength.hasValue()) { 491 if (Offset != EndAugmentationOffset) 492 return createStringError(errc::invalid_argument, 493 "parsing augmentation data at 0x%" PRIx64 494 " failed", 495 StartOffset); 496 AugmentationData = Data.getData().slice(StartAugmentationOffset, 497 EndAugmentationOffset); 498 } 499 } 500 501 auto Cie = std::make_unique<CIE>( 502 IsDWARF64, StartOffset, Length, Version, AugmentationString, 503 AddressSize, SegmentDescriptorSize, CodeAlignmentFactor, 504 DataAlignmentFactor, ReturnAddressRegister, AugmentationData, 505 FDEPointerEncoding, LSDAPointerEncoding, Personality, 506 PersonalityEncoding, Arch); 507 CIEs[StartOffset] = Cie.get(); 508 Entries.emplace_back(std::move(Cie)); 509 } else { 510 // FDE 511 uint64_t CIEPointer = Id; 512 uint64_t InitialLocation = 0; 513 uint64_t AddressRange = 0; 514 Optional<uint64_t> LSDAAddress; 515 CIE *Cie = CIEs[IsEH ? (StartStructureOffset - CIEPointer) : CIEPointer]; 516 517 if (IsEH) { 518 // The address size is encoded in the CIE we reference. 519 if (!Cie) 520 return createStringError(errc::invalid_argument, 521 "parsing FDE data at 0x%" PRIx64 522 " failed due to missing CIE", 523 StartOffset); 524 if (auto Val = Data.getEncodedPointer( 525 &Offset, Cie->getFDEPointerEncoding(), 526 EHFrameAddress ? EHFrameAddress + Offset : 0)) { 527 InitialLocation = *Val; 528 } 529 if (auto Val = Data.getEncodedPointer( 530 &Offset, Cie->getFDEPointerEncoding(), 0)) { 531 AddressRange = *Val; 532 } 533 534 StringRef AugmentationString = Cie->getAugmentationString(); 535 if (!AugmentationString.empty()) { 536 // Parse the augmentation length and data for this FDE. 537 uint64_t AugmentationLength = Data.getULEB128(&Offset); 538 539 uint64_t EndAugmentationOffset = Offset + AugmentationLength; 540 541 // Decode the LSDA if the CIE augmentation string said we should. 542 if (Cie->getLSDAPointerEncoding() != DW_EH_PE_omit) { 543 LSDAAddress = Data.getEncodedPointer( 544 &Offset, Cie->getLSDAPointerEncoding(), 545 EHFrameAddress ? Offset + EHFrameAddress : 0); 546 } 547 548 if (Offset != EndAugmentationOffset) 549 return createStringError(errc::invalid_argument, 550 "parsing augmentation data at 0x%" PRIx64 551 " failed", 552 StartOffset); 553 } 554 } else { 555 InitialLocation = Data.getRelocatedAddress(&Offset); 556 AddressRange = Data.getRelocatedAddress(&Offset); 557 } 558 559 Entries.emplace_back(new FDE(IsDWARF64, StartOffset, Length, CIEPointer, 560 InitialLocation, AddressRange, Cie, 561 LSDAAddress, Arch)); 562 } 563 564 if (Error E = 565 Entries.back()->cfis().parse(Data, &Offset, EndStructureOffset)) 566 return E; 567 568 if (Offset != EndStructureOffset) 569 return createStringError( 570 errc::invalid_argument, 571 "parsing entry instructions at 0x%" PRIx64 " failed", StartOffset); 572 } 573 574 return Error::success(); 575 } 576 577 FrameEntry *DWARFDebugFrame::getEntryAtOffset(uint64_t Offset) const { 578 auto It = partition_point(Entries, [=](const std::unique_ptr<FrameEntry> &E) { 579 return E->getOffset() < Offset; 580 }); 581 if (It != Entries.end() && (*It)->getOffset() == Offset) 582 return It->get(); 583 return nullptr; 584 } 585 586 void DWARFDebugFrame::dump(raw_ostream &OS, const MCRegisterInfo *MRI, 587 Optional<uint64_t> Offset) const { 588 if (Offset) { 589 if (auto *Entry = getEntryAtOffset(*Offset)) 590 Entry->dump(OS, MRI, IsEH); 591 return; 592 } 593 594 OS << "\n"; 595 for (const auto &Entry : Entries) 596 Entry->dump(OS, MRI, IsEH); 597 } 598