1 //===- DWARFListTable.cpp ---------------------------------------------===// 2 // 3 // The LLVM Compiler Infrastructure 4 // 5 // This file is distributed under the University of Illinois Open Source 6 // License. See LICENSE.TXT for details. 7 // 8 //===----------------------------------------------------------------------===// 9 10 #include "llvm/DebugInfo/DWARF/DWARFListTable.h" 11 #include "llvm/BinaryFormat/Dwarf.h" 12 #include "llvm/Support/Error.h" 13 #include "llvm/Support/Format.h" 14 #include "llvm/Support/raw_ostream.h" 15 16 using namespace llvm; 17 18 template <typename... Ts> 19 static Error createError(char const *Fmt, const Ts &... Vals) { 20 std::string Buffer; 21 raw_string_ostream Stream(Buffer); 22 Stream << format(Fmt, Vals...); 23 return make_error<StringError>(Stream.str(), inconvertibleErrorCode()); 24 } 25 26 Error DWARFListTableHeader::extract(DWARFDataExtractor Data, 27 uint32_t *OffsetPtr) { 28 HeaderOffset = *OffsetPtr; 29 // Read and verify the length field. 30 if (!Data.isValidOffsetForDataOfSize(*OffsetPtr, sizeof(uint32_t))) 31 return createError("section is not large enough to contain a " 32 "%s table length at offset 0x%" PRIx32, 33 SectionName.data(), *OffsetPtr); 34 // TODO: Add support for DWARF64. 35 HeaderData.Length = Data.getU32(OffsetPtr); 36 if (HeaderData.Length == 0xffffffffu) 37 return createError("DWARF64 is not supported in %s at offset 0x%" PRIx32, 38 SectionName.data(), HeaderOffset); 39 Format = dwarf::DwarfFormat::DWARF32; 40 if (HeaderData.Length + sizeof(uint32_t) < sizeof(Header)) 41 return createError("%s table at offset 0x%" PRIx32 42 " has too small length (0x%" PRIx32 43 ") to contain a complete header", 44 SectionName.data(), HeaderOffset, length()); 45 uint32_t End = HeaderOffset + length(); 46 if (!Data.isValidOffsetForDataOfSize(HeaderOffset, End - HeaderOffset)) 47 return createError("section is not large enough to contain a %s table " 48 "of length 0x%" PRIx32 " at offset 0x%" PRIx32, 49 SectionName.data(), length(), HeaderOffset); 50 51 HeaderData.Version = Data.getU16(OffsetPtr); 52 HeaderData.AddrSize = Data.getU8(OffsetPtr); 53 HeaderData.SegSize = Data.getU8(OffsetPtr); 54 HeaderData.OffsetEntryCount = Data.getU32(OffsetPtr); 55 56 // Perform basic validation of the remaining header fields. 57 if (HeaderData.Version != 5) 58 return createError("unrecognised %s table version %" PRIu16 59 " in table at offset 0x%" PRIx32, 60 SectionName.data(), HeaderData.Version, HeaderOffset); 61 if (HeaderData.AddrSize != 4 && HeaderData.AddrSize != 8) 62 return createError("%s table at offset 0x%" PRIx32 63 " has unsupported address size %hhu", 64 SectionName.data(), HeaderOffset, HeaderData.AddrSize); 65 if (HeaderData.SegSize != 0) 66 return createError("%s table at offset 0x%" PRIx32 67 " has unsupported segment selector size %" PRIu8, 68 SectionName.data(), HeaderOffset, HeaderData.SegSize); 69 if (End < HeaderOffset + sizeof(HeaderData) + 70 HeaderData.OffsetEntryCount * sizeof(uint32_t)) 71 return createError( 72 "%s table at offset 0x%" PRIx32 " has more offset entries (%" PRIu32 73 ") than there is space for", 74 SectionName.data(), HeaderOffset, HeaderData.OffsetEntryCount); 75 Data.setAddressSize(HeaderData.AddrSize); 76 for (uint32_t I = 0; I < HeaderData.OffsetEntryCount; ++I) 77 Offsets.push_back(Data.getU32(OffsetPtr)); 78 return Error::success(); 79 } 80 81 void DWARFListTableHeader::dump(raw_ostream &OS, DIDumpOptions DumpOpts) const { 82 if (DumpOpts.Verbose) 83 OS << format("0x%8.8" PRIx32 ": ", HeaderOffset); 84 OS << format( 85 "%s list header: length = 0x%8.8" PRIx32 ", version = 0x%4.4" PRIx16 ", " 86 "addr_size = 0x%2.2" PRIx8 ", seg_size = 0x%2.2" PRIx8 87 ", offset_entry_count = " 88 "0x%8.8" PRIx32 "\n", 89 ListTypeString.data(), HeaderData.Length, HeaderData.Version, 90 HeaderData.AddrSize, HeaderData.SegSize, HeaderData.OffsetEntryCount); 91 92 if (HeaderData.OffsetEntryCount > 0) { 93 OS << "offsets: ["; 94 for (const auto &Off : Offsets) { 95 OS << format("\n0x%8.8" PRIx32, Off); 96 if (DumpOpts.Verbose) 97 OS << format(" => 0x%8.8" PRIx32, 98 Off + HeaderOffset + sizeof(HeaderData)); 99 } 100 OS << "\n]\n"; 101 } 102 } 103 104 uint32_t DWARFListTableHeader::length() const { 105 if (HeaderData.Length == 0) 106 return 0; 107 // TODO: DWARF64 support. 108 return HeaderData.Length + sizeof(uint32_t); 109 } 110