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307bae0402
DWARFListTableHeader::length() handles the zero value of HeaderData.Length in a special way, which makes the result different from the calculated value of FullLength, which leads to triggering an assertion. The patch moves the assertion a bit later when `FullLength` is already checked for minimal allowed value. Differential Revision: https://reviews.llvm.org/D82886
109 lines
4.8 KiB
C++
109 lines
4.8 KiB
C++
//===- DWARFListTable.cpp ---------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/DebugInfo/DWARF/DWARFListTable.h"
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#include "llvm/BinaryFormat/Dwarf.h"
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#include "llvm/Support/Errc.h"
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#include "llvm/Support/Error.h"
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#include "llvm/Support/Format.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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Error DWARFListTableHeader::extract(DWARFDataExtractor Data,
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uint64_t *OffsetPtr) {
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HeaderOffset = *OffsetPtr;
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Error Err = Error::success();
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std::tie(HeaderData.Length, Format) = Data.getInitialLength(OffsetPtr, &Err);
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if (Err)
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return createStringError(
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errc::invalid_argument, "parsing %s table at offset 0x%" PRIx64 ": %s",
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SectionName.data(), HeaderOffset, toString(std::move(Err)).c_str());
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uint8_t OffsetByteSize = Format == dwarf::DWARF64 ? 8 : 4;
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uint64_t FullLength =
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HeaderData.Length + dwarf::getUnitLengthFieldByteSize(Format);
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if (FullLength < getHeaderSize(Format))
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return createStringError(errc::invalid_argument,
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"%s table at offset 0x%" PRIx64
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" has too small length (0x%" PRIx64
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") to contain a complete header",
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SectionName.data(), HeaderOffset, FullLength);
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assert(FullLength == length() && "Inconsistent calculation of length.");
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uint64_t End = HeaderOffset + FullLength;
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if (!Data.isValidOffsetForDataOfSize(HeaderOffset, FullLength))
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return createStringError(errc::invalid_argument,
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"section is not large enough to contain a %s table "
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"of length 0x%" PRIx64 " at offset 0x%" PRIx64,
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SectionName.data(), FullLength, HeaderOffset);
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HeaderData.Version = Data.getU16(OffsetPtr);
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HeaderData.AddrSize = Data.getU8(OffsetPtr);
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HeaderData.SegSize = Data.getU8(OffsetPtr);
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HeaderData.OffsetEntryCount = Data.getU32(OffsetPtr);
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// Perform basic validation of the remaining header fields.
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if (HeaderData.Version != 5)
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return createStringError(errc::invalid_argument,
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"unrecognised %s table version %" PRIu16
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" in table at offset 0x%" PRIx64,
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SectionName.data(), HeaderData.Version, HeaderOffset);
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if (HeaderData.AddrSize != 4 && HeaderData.AddrSize != 8)
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return createStringError(errc::not_supported,
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"%s table at offset 0x%" PRIx64
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" has unsupported address size %" PRIu8,
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SectionName.data(), HeaderOffset, HeaderData.AddrSize);
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if (HeaderData.SegSize != 0)
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return createStringError(errc::not_supported,
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"%s table at offset 0x%" PRIx64
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" has unsupported segment selector size %" PRIu8,
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SectionName.data(), HeaderOffset, HeaderData.SegSize);
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if (End < HeaderOffset + getHeaderSize(Format) +
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HeaderData.OffsetEntryCount * OffsetByteSize)
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return createStringError(errc::invalid_argument,
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"%s table at offset 0x%" PRIx64 " has more offset entries (%" PRIu32
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") than there is space for",
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SectionName.data(), HeaderOffset, HeaderData.OffsetEntryCount);
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Data.setAddressSize(HeaderData.AddrSize);
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for (uint32_t I = 0; I < HeaderData.OffsetEntryCount; ++I)
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Offsets.push_back(Data.getRelocatedValue(OffsetByteSize, OffsetPtr));
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return Error::success();
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}
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void DWARFListTableHeader::dump(raw_ostream &OS, DIDumpOptions DumpOpts) const {
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if (DumpOpts.Verbose)
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OS << format("0x%8.8" PRIx64 ": ", HeaderOffset);
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int OffsetDumpWidth = 2 * dwarf::getDwarfOffsetByteSize(Format);
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OS << format("%s list header: length = 0x%0*" PRIx64, ListTypeString.data(),
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OffsetDumpWidth, HeaderData.Length)
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<< ", format = " << dwarf::FormatString(Format)
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<< format(", version = 0x%4.4" PRIx16 ", addr_size = 0x%2.2" PRIx8
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", seg_size = 0x%2.2" PRIx8
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", offset_entry_count = 0x%8.8" PRIx32 "\n",
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HeaderData.Version, HeaderData.AddrSize, HeaderData.SegSize,
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HeaderData.OffsetEntryCount);
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if (HeaderData.OffsetEntryCount > 0) {
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OS << "offsets: [";
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for (const auto &Off : Offsets) {
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OS << format("\n0x%0*" PRIx64, OffsetDumpWidth, Off);
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if (DumpOpts.Verbose)
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OS << format(" => 0x%08" PRIx64,
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Off + HeaderOffset + getHeaderSize(Format));
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}
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OS << "\n]\n";
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}
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}
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uint64_t DWARFListTableHeader::length() const {
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if (HeaderData.Length == 0)
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return 0;
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return HeaderData.Length + dwarf::getUnitLengthFieldByteSize(Format);
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}
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