| //===- DWARFDebugAddr.cpp -------------------------------------------------===// |
| // |
| // 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/DWARFDebugAddr.h" |
| #include "llvm/BinaryFormat/Dwarf.h" |
| #include "llvm/DebugInfo/DWARF/DWARFUnit.h" |
| |
| using namespace llvm; |
| |
| void DWARFDebugAddrTable::clear() { |
| HeaderData = {}; |
| Addrs.clear(); |
| invalidateLength(); |
| } |
| |
| Error DWARFDebugAddrTable::extract(DWARFDataExtractor Data, |
| uint64_t *OffsetPtr, |
| uint16_t Version, |
| uint8_t AddrSize, |
| std::function<void(Error)> WarnCallback) { |
| clear(); |
| HeaderOffset = *OffsetPtr; |
| // Read and verify the length field. |
| if (!Data.isValidOffsetForDataOfSize(*OffsetPtr, sizeof(uint32_t))) |
| return createStringError(errc::invalid_argument, |
| "section is not large enough to contain a " |
| ".debug_addr table length at offset 0x%" |
| PRIx64, *OffsetPtr); |
| uint16_t UnitVersion; |
| if (Version == 0) { |
| WarnCallback(createStringError(errc::invalid_argument, |
| "DWARF version is not defined in CU," |
| " assuming version 5")); |
| UnitVersion = 5; |
| } else { |
| UnitVersion = Version; |
| } |
| // TODO: Add support for DWARF64. |
| Format = dwarf::DwarfFormat::DWARF32; |
| if (UnitVersion >= 5) { |
| HeaderData.Length = Data.getU32(OffsetPtr); |
| if (HeaderData.Length == dwarf::DW_LENGTH_DWARF64) { |
| invalidateLength(); |
| return createStringError(errc::not_supported, |
| "DWARF64 is not supported in .debug_addr at offset 0x%" PRIx64, |
| HeaderOffset); |
| } |
| if (HeaderData.Length + sizeof(uint32_t) < sizeof(Header)) { |
| uint32_t TmpLength = getLength(); |
| invalidateLength(); |
| return createStringError(errc::invalid_argument, |
| ".debug_addr table at offset 0x%" PRIx64 |
| " has too small length (0x%" PRIx32 |
| ") to contain a complete header", |
| HeaderOffset, TmpLength); |
| } |
| uint64_t End = HeaderOffset + getLength(); |
| if (!Data.isValidOffsetForDataOfSize(HeaderOffset, End - HeaderOffset)) { |
| uint32_t TmpLength = getLength(); |
| invalidateLength(); |
| return createStringError(errc::invalid_argument, |
| "section is not large enough to contain a .debug_addr table " |
| "of length 0x%" PRIx32 " at offset 0x%" PRIx64, |
| TmpLength, HeaderOffset); |
| } |
| |
| HeaderData.Version = Data.getU16(OffsetPtr); |
| HeaderData.AddrSize = Data.getU8(OffsetPtr); |
| HeaderData.SegSize = Data.getU8(OffsetPtr); |
| DataSize = getDataSize(); |
| } else { |
| HeaderData.Version = UnitVersion; |
| HeaderData.AddrSize = AddrSize; |
| // TODO: Support for non-zero SegSize. |
| HeaderData.SegSize = 0; |
| DataSize = Data.size(); |
| } |
| |
| // Perform basic validation of the remaining header fields. |
| |
| // We support DWARF version 5 for now as well as pre-DWARF5 |
| // implementations of .debug_addr table, which doesn't contain a header |
| // and consists only of a series of addresses. |
| if (HeaderData.Version > 5) { |
| return createStringError(errc::not_supported, "version %" PRIu16 |
| " of .debug_addr section at offset 0x%" PRIx64 " is not supported", |
| HeaderData.Version, HeaderOffset); |
| } |
| // FIXME: For now we just treat version mismatch as an error, |
| // however the correct way to associate a .debug_addr table |
| // with a .debug_info table is to look at the DW_AT_addr_base |
| // attribute in the info table. |
| if (HeaderData.Version != UnitVersion) |
| return createStringError(errc::invalid_argument, |
| ".debug_addr table at offset 0x%" PRIx64 |
| " has version %" PRIu16 |
| " which is different from the version suggested" |
| " by the DWARF unit header: %" PRIu16, |
| HeaderOffset, HeaderData.Version, UnitVersion); |
| if (HeaderData.AddrSize != 4 && HeaderData.AddrSize != 8) |
| return createStringError(errc::not_supported, |
| ".debug_addr table at offset 0x%" PRIx64 |
| " has unsupported address size %" PRIu8, |
| HeaderOffset, HeaderData.AddrSize); |
| if (HeaderData.AddrSize != AddrSize && AddrSize != 0) |
| return createStringError(errc::invalid_argument, |
| ".debug_addr table at offset 0x%" PRIx64 |
| " has address size %" PRIu8 |
| " which is different from CU address size %" PRIu8, |
| HeaderOffset, HeaderData.AddrSize, AddrSize); |
| |
| // TODO: add support for non-zero segment selector size. |
| if (HeaderData.SegSize != 0) |
| return createStringError(errc::not_supported, |
| ".debug_addr table at offset 0x%" PRIx64 |
| " has unsupported segment selector size %" PRIu8, |
| HeaderOffset, HeaderData.SegSize); |
| if (DataSize % HeaderData.AddrSize != 0) { |
| invalidateLength(); |
| return createStringError(errc::invalid_argument, |
| ".debug_addr table at offset 0x%" PRIx64 |
| " contains data of size %" PRIu32 |
| " which is not a multiple of addr size %" PRIu8, |
| HeaderOffset, DataSize, HeaderData.AddrSize); |
| } |
| Data.setAddressSize(HeaderData.AddrSize); |
| uint32_t AddrCount = DataSize / HeaderData.AddrSize; |
| for (uint32_t I = 0; I < AddrCount; ++I) |
| if (HeaderData.AddrSize == 4) |
| Addrs.push_back(Data.getU32(OffsetPtr)); |
| else |
| Addrs.push_back(Data.getU64(OffsetPtr)); |
| return Error::success(); |
| } |
| |
| void DWARFDebugAddrTable::dump(raw_ostream &OS, DIDumpOptions DumpOpts) const { |
| if (DumpOpts.Verbose) |
| OS << format("0x%8.8" PRIx32 ": ", HeaderOffset); |
| OS << format("Addr Section: length = 0x%8.8" PRIx32 |
| ", version = 0x%4.4" PRIx16 ", " |
| "addr_size = 0x%2.2" PRIx8 ", seg_size = 0x%2.2" PRIx8 "\n", |
| HeaderData.Length, HeaderData.Version, HeaderData.AddrSize, |
| HeaderData.SegSize); |
| |
| if (Addrs.size() > 0) { |
| const char *AddrFmt = (HeaderData.AddrSize == 4) ? "0x%8.8" PRIx64 "\n" |
| : "0x%16.16" PRIx64 "\n"; |
| OS << "Addrs: [\n"; |
| for (uint64_t Addr : Addrs) |
| OS << format(AddrFmt, Addr); |
| OS << "]\n"; |
| } |
| } |
| |
| Expected<uint64_t> DWARFDebugAddrTable::getAddrEntry(uint32_t Index) const { |
| if (Index < Addrs.size()) |
| return Addrs[Index]; |
| return createStringError(errc::invalid_argument, |
| "Index %" PRIu32 " is out of range of the " |
| ".debug_addr table at offset 0x%" PRIx64, |
| Index, HeaderOffset); |
| } |
| |
| uint32_t DWARFDebugAddrTable::getLength() const { |
| if (HeaderData.Length == 0) |
| return 0; |
| // TODO: DWARF64 support. |
| return HeaderData.Length + sizeof(uint32_t); |
| } |
| |
| uint32_t DWARFDebugAddrTable::getDataSize() const { |
| if (DataSize != 0) |
| return DataSize; |
| if (getLength() == 0) |
| return 0; |
| return getLength() - getHeaderSize(); |
| } |
