| //===- DWARFDebugFrame.h - Parsing of .debug_frame ------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "llvm/DebugInfo/DWARF/DWARFDebugFrame.h" |
| #include "llvm/ADT/DenseMap.h" |
| #include "llvm/ADT/Optional.h" |
| #include "llvm/ADT/StringExtras.h" |
| #include "llvm/ADT/StringRef.h" |
| #include "llvm/BinaryFormat/Dwarf.h" |
| #include "llvm/MC/MCRegisterInfo.h" |
| #include "llvm/Support/Casting.h" |
| #include "llvm/Support/Compiler.h" |
| #include "llvm/Support/DataExtractor.h" |
| #include "llvm/Support/Errc.h" |
| #include "llvm/Support/ErrorHandling.h" |
| #include "llvm/Support/Format.h" |
| #include "llvm/Support/raw_ostream.h" |
| #include <algorithm> |
| #include <cassert> |
| #include <cinttypes> |
| #include <cstdint> |
| #include <string> |
| #include <vector> |
| |
| using namespace llvm; |
| using namespace dwarf; |
| |
| static void printRegister(raw_ostream &OS, const MCRegisterInfo *MRI, bool IsEH, |
| unsigned RegNum) { |
| if (MRI) { |
| if (Optional<unsigned> LLVMRegNum = MRI->getLLVMRegNum(RegNum, IsEH)) { |
| if (const char *RegName = MRI->getName(*LLVMRegNum)) { |
| OS << RegName; |
| return; |
| } |
| } |
| } |
| OS << "reg" << RegNum; |
| } |
| |
| // See DWARF standard v3, section 7.23 |
| const uint8_t DWARF_CFI_PRIMARY_OPCODE_MASK = 0xc0; |
| const uint8_t DWARF_CFI_PRIMARY_OPERAND_MASK = 0x3f; |
| |
| Error CFIProgram::parse(DWARFDataExtractor Data, uint64_t *Offset, |
| uint64_t EndOffset) { |
| DataExtractor::Cursor C(*Offset); |
| while (C && C.tell() < EndOffset) { |
| uint8_t Opcode = Data.getRelocatedValue(C, 1); |
| if (!C) |
| break; |
| |
| // Some instructions have a primary opcode encoded in the top bits. |
| if (uint8_t Primary = Opcode & DWARF_CFI_PRIMARY_OPCODE_MASK) { |
| // If it's a primary opcode, the first operand is encoded in the bottom |
| // bits of the opcode itself. |
| uint64_t Op1 = Opcode & DWARF_CFI_PRIMARY_OPERAND_MASK; |
| switch (Primary) { |
| case DW_CFA_advance_loc: |
| case DW_CFA_restore: |
| addInstruction(Primary, Op1); |
| break; |
| case DW_CFA_offset: |
| addInstruction(Primary, Op1, Data.getULEB128(C)); |
| break; |
| default: |
| llvm_unreachable("invalid primary CFI opcode"); |
| } |
| continue; |
| } |
| |
| // Extended opcode - its value is Opcode itself. |
| switch (Opcode) { |
| default: |
| return createStringError(errc::illegal_byte_sequence, |
| "invalid extended CFI opcode 0x%" PRIx8, Opcode); |
| case DW_CFA_nop: |
| case DW_CFA_remember_state: |
| case DW_CFA_restore_state: |
| case DW_CFA_GNU_window_save: |
| // No operands |
| addInstruction(Opcode); |
| break; |
| case DW_CFA_set_loc: |
| // Operands: Address |
| addInstruction(Opcode, Data.getRelocatedAddress(C)); |
| break; |
| case DW_CFA_advance_loc1: |
| // Operands: 1-byte delta |
| addInstruction(Opcode, Data.getRelocatedValue(C, 1)); |
| break; |
| case DW_CFA_advance_loc2: |
| // Operands: 2-byte delta |
| addInstruction(Opcode, Data.getRelocatedValue(C, 2)); |
| break; |
| case DW_CFA_advance_loc4: |
| // Operands: 4-byte delta |
| addInstruction(Opcode, Data.getRelocatedValue(C, 4)); |
| break; |
| case DW_CFA_restore_extended: |
| case DW_CFA_undefined: |
| case DW_CFA_same_value: |
| case DW_CFA_def_cfa_register: |
| case DW_CFA_def_cfa_offset: |
| case DW_CFA_GNU_args_size: |
| // Operands: ULEB128 |
| addInstruction(Opcode, Data.getULEB128(C)); |
| break; |
| case DW_CFA_def_cfa_offset_sf: |
| // Operands: SLEB128 |
| addInstruction(Opcode, Data.getSLEB128(C)); |
| break; |
| case DW_CFA_offset_extended: |
| case DW_CFA_register: |
| case DW_CFA_def_cfa: |
| case DW_CFA_val_offset: { |
| // Operands: ULEB128, ULEB128 |
| // Note: We can not embed getULEB128 directly into function |
| // argument list. getULEB128 changes Offset and order of evaluation |
| // for arguments is unspecified. |
| uint64_t op1 = Data.getULEB128(C); |
| uint64_t op2 = Data.getULEB128(C); |
| addInstruction(Opcode, op1, op2); |
| break; |
| } |
| case DW_CFA_offset_extended_sf: |
| case DW_CFA_def_cfa_sf: |
| case DW_CFA_val_offset_sf: { |
| // Operands: ULEB128, SLEB128 |
| // Note: see comment for the previous case |
| uint64_t op1 = Data.getULEB128(C); |
| uint64_t op2 = (uint64_t)Data.getSLEB128(C); |
| addInstruction(Opcode, op1, op2); |
| break; |
| } |
| case DW_CFA_def_cfa_expression: { |
| uint64_t ExprLength = Data.getULEB128(C); |
| addInstruction(Opcode, 0); |
| StringRef Expression = Data.getBytes(C, ExprLength); |
| |
| DataExtractor Extractor(Expression, Data.isLittleEndian(), |
| Data.getAddressSize()); |
| // Note. We do not pass the DWARF format to DWARFExpression, because |
| // DW_OP_call_ref, the only operation which depends on the format, is |
| // prohibited in call frame instructions, see sec. 6.4.2 in DWARFv5. |
| Instructions.back().Expression = |
| DWARFExpression(Extractor, Data.getAddressSize()); |
| break; |
| } |
| case DW_CFA_expression: |
| case DW_CFA_val_expression: { |
| uint64_t RegNum = Data.getULEB128(C); |
| addInstruction(Opcode, RegNum, 0); |
| |
| uint64_t BlockLength = Data.getULEB128(C); |
| StringRef Expression = Data.getBytes(C, BlockLength); |
| DataExtractor Extractor(Expression, Data.isLittleEndian(), |
| Data.getAddressSize()); |
| // Note. We do not pass the DWARF format to DWARFExpression, because |
| // DW_OP_call_ref, the only operation which depends on the format, is |
| // prohibited in call frame instructions, see sec. 6.4.2 in DWARFv5. |
| Instructions.back().Expression = |
| DWARFExpression(Extractor, Data.getAddressSize()); |
| break; |
| } |
| } |
| } |
| |
| *Offset = C.tell(); |
| return C.takeError(); |
| } |
| |
| namespace { |
| |
| |
| } // end anonymous namespace |
| |
| ArrayRef<CFIProgram::OperandType[2]> CFIProgram::getOperandTypes() { |
| static OperandType OpTypes[DW_CFA_restore+1][2]; |
| static bool Initialized = false; |
| if (Initialized) { |
| return ArrayRef<OperandType[2]>(&OpTypes[0], DW_CFA_restore+1); |
| } |
| Initialized = true; |
| |
| #define DECLARE_OP2(OP, OPTYPE0, OPTYPE1) \ |
| do { \ |
| OpTypes[OP][0] = OPTYPE0; \ |
| OpTypes[OP][1] = OPTYPE1; \ |
| } while (false) |
| #define DECLARE_OP1(OP, OPTYPE0) DECLARE_OP2(OP, OPTYPE0, OT_None) |
| #define DECLARE_OP0(OP) DECLARE_OP1(OP, OT_None) |
| |
| DECLARE_OP1(DW_CFA_set_loc, OT_Address); |
| DECLARE_OP1(DW_CFA_advance_loc, OT_FactoredCodeOffset); |
| DECLARE_OP1(DW_CFA_advance_loc1, OT_FactoredCodeOffset); |
| DECLARE_OP1(DW_CFA_advance_loc2, OT_FactoredCodeOffset); |
| DECLARE_OP1(DW_CFA_advance_loc4, OT_FactoredCodeOffset); |
| DECLARE_OP1(DW_CFA_MIPS_advance_loc8, OT_FactoredCodeOffset); |
| DECLARE_OP2(DW_CFA_def_cfa, OT_Register, OT_Offset); |
| DECLARE_OP2(DW_CFA_def_cfa_sf, OT_Register, OT_SignedFactDataOffset); |
| DECLARE_OP1(DW_CFA_def_cfa_register, OT_Register); |
| DECLARE_OP1(DW_CFA_def_cfa_offset, OT_Offset); |
| DECLARE_OP1(DW_CFA_def_cfa_offset_sf, OT_SignedFactDataOffset); |
| DECLARE_OP1(DW_CFA_def_cfa_expression, OT_Expression); |
| DECLARE_OP1(DW_CFA_undefined, OT_Register); |
| DECLARE_OP1(DW_CFA_same_value, OT_Register); |
| DECLARE_OP2(DW_CFA_offset, OT_Register, OT_UnsignedFactDataOffset); |
| DECLARE_OP2(DW_CFA_offset_extended, OT_Register, OT_UnsignedFactDataOffset); |
| DECLARE_OP2(DW_CFA_offset_extended_sf, OT_Register, OT_SignedFactDataOffset); |
| DECLARE_OP2(DW_CFA_val_offset, OT_Register, OT_UnsignedFactDataOffset); |
| DECLARE_OP2(DW_CFA_val_offset_sf, OT_Register, OT_SignedFactDataOffset); |
| DECLARE_OP2(DW_CFA_register, OT_Register, OT_Register); |
| DECLARE_OP2(DW_CFA_expression, OT_Register, OT_Expression); |
| DECLARE_OP2(DW_CFA_val_expression, OT_Register, OT_Expression); |
| DECLARE_OP1(DW_CFA_restore, OT_Register); |
| DECLARE_OP1(DW_CFA_restore_extended, OT_Register); |
| DECLARE_OP0(DW_CFA_remember_state); |
| DECLARE_OP0(DW_CFA_restore_state); |
| DECLARE_OP0(DW_CFA_GNU_window_save); |
| DECLARE_OP1(DW_CFA_GNU_args_size, OT_Offset); |
| DECLARE_OP0(DW_CFA_nop); |
| |
| #undef DECLARE_OP0 |
| #undef DECLARE_OP1 |
| #undef DECLARE_OP2 |
| |
| return ArrayRef<OperandType[2]>(&OpTypes[0], DW_CFA_restore+1); |
| } |
| |
| /// Print \p Opcode's operand number \p OperandIdx which has value \p Operand. |
| void CFIProgram::printOperand(raw_ostream &OS, DIDumpOptions DumpOpts, |
| const MCRegisterInfo *MRI, bool IsEH, |
| const Instruction &Instr, unsigned OperandIdx, |
| uint64_t Operand) const { |
| assert(OperandIdx < 2); |
| uint8_t Opcode = Instr.Opcode; |
| OperandType Type = getOperandTypes()[Opcode][OperandIdx]; |
| |
| switch (Type) { |
| case OT_Unset: { |
| OS << " Unsupported " << (OperandIdx ? "second" : "first") << " operand to"; |
| auto OpcodeName = CallFrameString(Opcode, Arch); |
| if (!OpcodeName.empty()) |
| OS << " " << OpcodeName; |
| else |
| OS << format(" Opcode %x", Opcode); |
| break; |
| } |
| case OT_None: |
| break; |
| case OT_Address: |
| OS << format(" %" PRIx64, Operand); |
| break; |
| case OT_Offset: |
| // The offsets are all encoded in a unsigned form, but in practice |
| // consumers use them signed. It's most certainly legacy due to |
| // the lack of signed variants in the first Dwarf standards. |
| OS << format(" %+" PRId64, int64_t(Operand)); |
| break; |
| case OT_FactoredCodeOffset: // Always Unsigned |
| if (CodeAlignmentFactor) |
| OS << format(" %" PRId64, Operand * CodeAlignmentFactor); |
| else |
| OS << format(" %" PRId64 "*code_alignment_factor" , Operand); |
| break; |
| case OT_SignedFactDataOffset: |
| if (DataAlignmentFactor) |
| OS << format(" %" PRId64, int64_t(Operand) * DataAlignmentFactor); |
| else |
| OS << format(" %" PRId64 "*data_alignment_factor" , int64_t(Operand)); |
| break; |
| case OT_UnsignedFactDataOffset: |
| if (DataAlignmentFactor) |
| OS << format(" %" PRId64, Operand * DataAlignmentFactor); |
| else |
| OS << format(" %" PRId64 "*data_alignment_factor" , Operand); |
| break; |
| case OT_Register: |
| OS << ' '; |
| printRegister(OS, MRI, IsEH, Operand); |
| break; |
| case OT_Expression: |
| assert(Instr.Expression && "missing DWARFExpression object"); |
| OS << " "; |
| Instr.Expression->print(OS, DumpOpts, MRI, nullptr, IsEH); |
| break; |
| } |
| } |
| |
| void CFIProgram::dump(raw_ostream &OS, DIDumpOptions DumpOpts, |
| const MCRegisterInfo *MRI, bool IsEH, |
| unsigned IndentLevel) const { |
| for (const auto &Instr : Instructions) { |
| uint8_t Opcode = Instr.Opcode; |
| if (Opcode & DWARF_CFI_PRIMARY_OPCODE_MASK) |
| Opcode &= DWARF_CFI_PRIMARY_OPCODE_MASK; |
| OS.indent(2 * IndentLevel); |
| OS << CallFrameString(Opcode, Arch) << ":"; |
| for (unsigned i = 0; i < Instr.Ops.size(); ++i) |
| printOperand(OS, DumpOpts, MRI, IsEH, Instr, i, Instr.Ops[i]); |
| OS << '\n'; |
| } |
| } |
| |
| // Returns the CIE identifier to be used by the requested format. |
| // CIE ids for .debug_frame sections are defined in Section 7.24 of DWARFv5. |
| // For CIE ID in .eh_frame sections see |
| // https://refspecs.linuxfoundation.org/LSB_5.0.0/LSB-Core-generic/LSB-Core-generic/ehframechpt.html |
| constexpr uint64_t getCIEId(bool IsDWARF64, bool IsEH) { |
| if (IsEH) |
| return 0; |
| if (IsDWARF64) |
| return DW64_CIE_ID; |
| return DW_CIE_ID; |
| } |
| |
| void CIE::dump(raw_ostream &OS, DIDumpOptions DumpOpts, |
| const MCRegisterInfo *MRI, bool IsEH) const { |
| // A CIE with a zero length is a terminator entry in the .eh_frame section. |
| if (IsEH && Length == 0) { |
| OS << format("%08" PRIx64, Offset) << " ZERO terminator\n"; |
| return; |
| } |
| |
| OS << format("%08" PRIx64, Offset) |
| << format(" %0*" PRIx64, IsDWARF64 ? 16 : 8, Length) |
| << format(" %0*" PRIx64, IsDWARF64 && !IsEH ? 16 : 8, |
| getCIEId(IsDWARF64, IsEH)) |
| << " CIE\n" |
| << " Format: " << FormatString(IsDWARF64) << "\n" |
| << format(" Version: %d\n", Version) |
| << " Augmentation: \"" << Augmentation << "\"\n"; |
| if (Version >= 4) { |
| OS << format(" Address size: %u\n", (uint32_t)AddressSize); |
| OS << format(" Segment desc size: %u\n", |
| (uint32_t)SegmentDescriptorSize); |
| } |
| OS << format(" Code alignment factor: %u\n", (uint32_t)CodeAlignmentFactor); |
| OS << format(" Data alignment factor: %d\n", (int32_t)DataAlignmentFactor); |
| OS << format(" Return address column: %d\n", (int32_t)ReturnAddressRegister); |
| if (Personality) |
| OS << format(" Personality Address: %016" PRIx64 "\n", *Personality); |
| if (!AugmentationData.empty()) { |
| OS << " Augmentation data: "; |
| for (uint8_t Byte : AugmentationData) |
| OS << ' ' << hexdigit(Byte >> 4) << hexdigit(Byte & 0xf); |
| OS << "\n"; |
| } |
| OS << "\n"; |
| CFIs.dump(OS, DumpOpts, MRI, IsEH); |
| OS << "\n"; |
| } |
| |
| void FDE::dump(raw_ostream &OS, DIDumpOptions DumpOpts, |
| const MCRegisterInfo *MRI, bool IsEH) const { |
| OS << format("%08" PRIx64, Offset) |
| << format(" %0*" PRIx64, IsDWARF64 ? 16 : 8, Length) |
| << format(" %0*" PRIx64, IsDWARF64 && !IsEH ? 16 : 8, CIEPointer) |
| << " FDE cie="; |
| if (LinkedCIE) |
| OS << format("%08" PRIx64, LinkedCIE->getOffset()); |
| else |
| OS << "<invalid offset>"; |
| OS << format(" pc=%08" PRIx64 "...%08" PRIx64 "\n", InitialLocation, |
| InitialLocation + AddressRange); |
| OS << " Format: " << FormatString(IsDWARF64) << "\n"; |
| if (LSDAAddress) |
| OS << format(" LSDA Address: %016" PRIx64 "\n", *LSDAAddress); |
| CFIs.dump(OS, DumpOpts, MRI, IsEH); |
| OS << "\n"; |
| } |
| |
| DWARFDebugFrame::DWARFDebugFrame(Triple::ArchType Arch, |
| bool IsEH, uint64_t EHFrameAddress) |
| : Arch(Arch), IsEH(IsEH), EHFrameAddress(EHFrameAddress) {} |
| |
| DWARFDebugFrame::~DWARFDebugFrame() = default; |
| |
| static void LLVM_ATTRIBUTE_UNUSED dumpDataAux(DataExtractor Data, |
| uint64_t Offset, int Length) { |
| errs() << "DUMP: "; |
| for (int i = 0; i < Length; ++i) { |
| uint8_t c = Data.getU8(&Offset); |
| errs().write_hex(c); errs() << " "; |
| } |
| errs() << "\n"; |
| } |
| |
| Error DWARFDebugFrame::parse(DWARFDataExtractor Data) { |
| uint64_t Offset = 0; |
| DenseMap<uint64_t, CIE *> CIEs; |
| |
| while (Data.isValidOffset(Offset)) { |
| uint64_t StartOffset = Offset; |
| |
| uint64_t Length; |
| DwarfFormat Format; |
| std::tie(Length, Format) = Data.getInitialLength(&Offset); |
| bool IsDWARF64 = Format == DWARF64; |
| |
| // If the Length is 0, then this CIE is a terminator. We add it because some |
| // dumper tools might need it to print something special for such entries |
| // (e.g. llvm-objdump --dwarf=frames prints "ZERO terminator"). |
| if (Length == 0) { |
| auto Cie = std::make_unique<CIE>( |
| IsDWARF64, StartOffset, 0, 0, SmallString<8>(), 0, 0, 0, 0, 0, |
| SmallString<8>(), 0, 0, None, None, Arch); |
| CIEs[StartOffset] = Cie.get(); |
| Entries.push_back(std::move(Cie)); |
| break; |
| } |
| |
| // At this point, Offset points to the next field after Length. |
| // Length is the structure size excluding itself. Compute an offset one |
| // past the end of the structure (needed to know how many instructions to |
| // read). |
| uint64_t StartStructureOffset = Offset; |
| uint64_t EndStructureOffset = Offset + Length; |
| |
| // The Id field's size depends on the DWARF format |
| Error Err = Error::success(); |
| uint64_t Id = Data.getRelocatedValue((IsDWARF64 && !IsEH) ? 8 : 4, &Offset, |
| /*SectionIndex=*/nullptr, &Err); |
| if (Err) |
| return Err; |
| |
| if (Id == getCIEId(IsDWARF64, IsEH)) { |
| uint8_t Version = Data.getU8(&Offset); |
| const char *Augmentation = Data.getCStr(&Offset); |
| StringRef AugmentationString(Augmentation ? Augmentation : ""); |
| // TODO: we should provide a way to report a warning and continue dumping. |
| if (IsEH && Version != 1) |
| return createStringError(errc::not_supported, |
| "unsupported CIE version: %" PRIu8, Version); |
| |
| uint8_t AddressSize = Version < 4 ? Data.getAddressSize() : |
| Data.getU8(&Offset); |
| Data.setAddressSize(AddressSize); |
| uint8_t SegmentDescriptorSize = Version < 4 ? 0 : Data.getU8(&Offset); |
| uint64_t CodeAlignmentFactor = Data.getULEB128(&Offset); |
| int64_t DataAlignmentFactor = Data.getSLEB128(&Offset); |
| uint64_t ReturnAddressRegister = |
| Version == 1 ? Data.getU8(&Offset) : Data.getULEB128(&Offset); |
| |
| // Parse the augmentation data for EH CIEs |
| StringRef AugmentationData(""); |
| uint32_t FDEPointerEncoding = DW_EH_PE_absptr; |
| uint32_t LSDAPointerEncoding = DW_EH_PE_omit; |
| Optional<uint64_t> Personality; |
| Optional<uint32_t> PersonalityEncoding; |
| if (IsEH) { |
| Optional<uint64_t> AugmentationLength; |
| uint64_t StartAugmentationOffset; |
| uint64_t EndAugmentationOffset; |
| |
| // Walk the augmentation string to get all the augmentation data. |
| for (unsigned i = 0, e = AugmentationString.size(); i != e; ++i) { |
| switch (AugmentationString[i]) { |
| default: |
| return createStringError( |
| errc::invalid_argument, |
| "unknown augmentation character in entry at 0x%" PRIx64, |
| StartOffset); |
| case 'L': |
| LSDAPointerEncoding = Data.getU8(&Offset); |
| break; |
| case 'P': { |
| if (Personality) |
| return createStringError( |
| errc::invalid_argument, |
| "duplicate personality in entry at 0x%" PRIx64, StartOffset); |
| PersonalityEncoding = Data.getU8(&Offset); |
| Personality = Data.getEncodedPointer( |
| &Offset, *PersonalityEncoding, |
| EHFrameAddress ? EHFrameAddress + Offset : 0); |
| break; |
| } |
| case 'R': |
| FDEPointerEncoding = Data.getU8(&Offset); |
| break; |
| case 'S': |
| // Current frame is a signal trampoline. |
| break; |
| case 'z': |
| if (i) |
| return createStringError( |
| errc::invalid_argument, |
| "'z' must be the first character at 0x%" PRIx64, StartOffset); |
| // Parse the augmentation length first. We only parse it if |
| // the string contains a 'z'. |
| AugmentationLength = Data.getULEB128(&Offset); |
| StartAugmentationOffset = Offset; |
| EndAugmentationOffset = Offset + *AugmentationLength; |
| break; |
| case 'B': |
| // B-Key is used for signing functions associated with this |
| // augmentation string |
| break; |
| } |
| } |
| |
| if (AugmentationLength.hasValue()) { |
| if (Offset != EndAugmentationOffset) |
| return createStringError(errc::invalid_argument, |
| "parsing augmentation data at 0x%" PRIx64 |
| " failed", |
| StartOffset); |
| AugmentationData = Data.getData().slice(StartAugmentationOffset, |
| EndAugmentationOffset); |
| } |
| } |
| |
| auto Cie = std::make_unique<CIE>( |
| IsDWARF64, StartOffset, Length, Version, AugmentationString, |
| AddressSize, SegmentDescriptorSize, CodeAlignmentFactor, |
| DataAlignmentFactor, ReturnAddressRegister, AugmentationData, |
| FDEPointerEncoding, LSDAPointerEncoding, Personality, |
| PersonalityEncoding, Arch); |
| CIEs[StartOffset] = Cie.get(); |
| Entries.emplace_back(std::move(Cie)); |
| } else { |
| // FDE |
| uint64_t CIEPointer = Id; |
| uint64_t InitialLocation = 0; |
| uint64_t AddressRange = 0; |
| Optional<uint64_t> LSDAAddress; |
| CIE *Cie = CIEs[IsEH ? (StartStructureOffset - CIEPointer) : CIEPointer]; |
| |
| if (IsEH) { |
| // The address size is encoded in the CIE we reference. |
| if (!Cie) |
| return createStringError(errc::invalid_argument, |
| "parsing FDE data at 0x%" PRIx64 |
| " failed due to missing CIE", |
| StartOffset); |
| if (auto Val = |
| Data.getEncodedPointer(&Offset, Cie->getFDEPointerEncoding(), |
| EHFrameAddress + Offset)) { |
| InitialLocation = *Val; |
| } |
| if (auto Val = Data.getEncodedPointer( |
| &Offset, Cie->getFDEPointerEncoding(), 0)) { |
| AddressRange = *Val; |
| } |
| |
| StringRef AugmentationString = Cie->getAugmentationString(); |
| if (!AugmentationString.empty()) { |
| // Parse the augmentation length and data for this FDE. |
| uint64_t AugmentationLength = Data.getULEB128(&Offset); |
| |
| uint64_t EndAugmentationOffset = Offset + AugmentationLength; |
| |
| // Decode the LSDA if the CIE augmentation string said we should. |
| if (Cie->getLSDAPointerEncoding() != DW_EH_PE_omit) { |
| LSDAAddress = Data.getEncodedPointer( |
| &Offset, Cie->getLSDAPointerEncoding(), |
| EHFrameAddress ? Offset + EHFrameAddress : 0); |
| } |
| |
| if (Offset != EndAugmentationOffset) |
| return createStringError(errc::invalid_argument, |
| "parsing augmentation data at 0x%" PRIx64 |
| " failed", |
| StartOffset); |
| } |
| } else { |
| InitialLocation = Data.getRelocatedAddress(&Offset); |
| AddressRange = Data.getRelocatedAddress(&Offset); |
| } |
| |
| Entries.emplace_back(new FDE(IsDWARF64, StartOffset, Length, CIEPointer, |
| InitialLocation, AddressRange, Cie, |
| LSDAAddress, Arch)); |
| } |
| |
| if (Error E = |
| Entries.back()->cfis().parse(Data, &Offset, EndStructureOffset)) |
| return E; |
| |
| if (Offset != EndStructureOffset) |
| return createStringError( |
| errc::invalid_argument, |
| "parsing entry instructions at 0x%" PRIx64 " failed", StartOffset); |
| } |
| |
| return Error::success(); |
| } |
| |
| FrameEntry *DWARFDebugFrame::getEntryAtOffset(uint64_t Offset) const { |
| auto It = partition_point(Entries, [=](const std::unique_ptr<FrameEntry> &E) { |
| return E->getOffset() < Offset; |
| }); |
| if (It != Entries.end() && (*It)->getOffset() == Offset) |
| return It->get(); |
| return nullptr; |
| } |
| |
| void DWARFDebugFrame::dump(raw_ostream &OS, DIDumpOptions DumpOpts, |
| const MCRegisterInfo *MRI, |
| Optional<uint64_t> Offset) const { |
| if (Offset) { |
| if (auto *Entry = getEntryAtOffset(*Offset)) |
| Entry->dump(OS, DumpOpts, MRI, IsEH); |
| return; |
| } |
| |
| OS << "\n"; |
| for (const auto &Entry : Entries) |
| Entry->dump(OS, DumpOpts, MRI, IsEH); |
| } |
