diff options
Diffstat (limited to 'third_party/llvm-project/DWARFDebugAddr.cpp')
| -rw-r--r-- | third_party/llvm-project/DWARFDebugAddr.cpp | 182 |
1 files changed, 182 insertions, 0 deletions
diff --git a/third_party/llvm-project/DWARFDebugAddr.cpp b/third_party/llvm-project/DWARFDebugAddr.cpp new file mode 100644 index 000000000..f71543799 --- /dev/null +++ b/third_party/llvm-project/DWARFDebugAddr.cpp @@ -0,0 +1,182 @@ +//===- 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(); +} |