void DWARFDebugLoc::parse(const DWARFDataExtractor &data) {
IsLittleEndian = data.isLittleEndian();
AddressSize = data.getAddressSize();
uint32_t Offset = 0;
while (data.isValidOffset(Offset + data.getAddressSize() - 1)) {
if (auto LL = parseOneLocationList(data, &Offset))
Locations.push_back(std::move(*LL));
else
break;
}
if (data.isValidOffset(Offset))
errs() << "error: failed to consume entire .debug_loc section\n";
}
llvm::Error DWARFDebugNames::Header::extract(const DWARFDataExtractor &AS,
uint32_t *Offset) {
// Check that we can read the fixed-size part.
if (!AS.isValidOffset(*Offset + sizeof(HeaderPOD) - 1))
return make_error<StringError>("Section too small: cannot read header.",
inconvertibleErrorCode());
UnitLength = AS.getU32(Offset);
Version = AS.getU16(Offset);
Padding = AS.getU16(Offset);
CompUnitCount = AS.getU32(Offset);
LocalTypeUnitCount = AS.getU32(Offset);
ForeignTypeUnitCount = AS.getU32(Offset);
BucketCount = AS.getU32(Offset);
NameCount = AS.getU32(Offset);
AbbrevTableSize = AS.getU32(Offset);
AugmentationStringSize = AS.getU32(Offset);
if (!AS.isValidOffsetForDataOfSize(*Offset, AugmentationStringSize))
return make_error<StringError>(
"Section too small: cannot read header augmentation.",
inconvertibleErrorCode());
AugmentationString.resize(AugmentationStringSize);
AS.getU8(Offset, reinterpret_cast<uint8_t *>(AugmentationString.data()),
AugmentationStringSize);
*Offset = alignTo(*Offset, 4);
return Error::success();
}
bool DWARFDebugRangeList::extract(const DWARFDataExtractor &data,
uint32_t *offset_ptr) {
clear();
if (!data.isValidOffset(*offset_ptr))
return false;
AddressSize = data.getAddressSize();
if (AddressSize != 4 && AddressSize != 8)
return false;
Offset = *offset_ptr;
while (true) {
RangeListEntry entry;
uint32_t prev_offset = *offset_ptr;
entry.StartAddress =
data.getRelocatedAddress(offset_ptr, &entry.SectionIndex);
entry.EndAddress = data.getRelocatedAddress(offset_ptr);
// Check that both values were extracted correctly.
if (*offset_ptr != prev_offset + 2 * AddressSize) {
clear();
return false;
}
if (entry.isEndOfListEntry())
break;
Entries.push_back(entry);
}
return true;
}
Error DWARFDebugRangeList::extract(const DWARFDataExtractor &data,
uint32_t *offset_ptr) {
clear();
if (!data.isValidOffset(*offset_ptr))
return createStringError(errc::invalid_argument,
"invalid range list offset 0x%" PRIx32, *offset_ptr);
AddressSize = data.getAddressSize();
if (AddressSize != 4 && AddressSize != 8)
return createStringError(errc::invalid_argument,
"invalid address size: %" PRIu8, AddressSize);
Offset = *offset_ptr;
while (true) {
RangeListEntry Entry;
Entry.SectionIndex = -1ULL;
uint32_t prev_offset = *offset_ptr;
Entry.StartAddress = data.getRelocatedAddress(offset_ptr);
Entry.EndAddress =
data.getRelocatedAddress(offset_ptr, &Entry.SectionIndex);
// Check that both values were extracted correctly.
if (*offset_ptr != prev_offset + 2 * AddressSize) {
clear();
return createStringError(errc::invalid_argument,
"invalid range list entry at offset 0x%" PRIx32,
prev_offset);
}
if (Entry.isEndOfListEntry())
break;
Entries.push_back(Entry);
}
return Error::success();
}
Expected<const DWARFDebugLine::LineTable *> DWARFDebugLine::getOrParseLineTable(
DWARFDataExtractor &DebugLineData, uint32_t Offset, const DWARFContext &Ctx,
const DWARFUnit *U, std::function<void(Error)> RecoverableErrorCallback) {
if (!DebugLineData.isValidOffset(Offset))
return createStringError(errc::invalid_argument, "offset 0x%8.8" PRIx32
" is not a valid debug line section offset",
Offset);
std::pair<LineTableIter, bool> Pos =
LineTableMap.insert(LineTableMapTy::value_type(Offset, LineTable()));
LineTable *LT = &Pos.first->second;
if (Pos.second) {
if (Error Err =
LT->parse(DebugLineData, &Offset, Ctx, U, RecoverableErrorCallback))
return std::move(Err);
return LT;
}
return LT;
}
bool DWARFVerifier::verifyUnitHeader(const DWARFDataExtractor DebugInfoData,
uint32_t *Offset, unsigned UnitIndex,
uint8_t &UnitType, bool &isUnitDWARF64) {
uint32_t AbbrOffset, Length;
uint8_t AddrSize = 0;
uint16_t Version;
bool Success = true;
bool ValidLength = false;
bool ValidVersion = false;
bool ValidAddrSize = false;
bool ValidType = true;
bool ValidAbbrevOffset = true;
uint32_t OffsetStart = *Offset;
Length = DebugInfoData.getU32(Offset);
if (Length == UINT32_MAX) {
isUnitDWARF64 = true;
OS << format(
"Unit[%d] is in 64-bit DWARF format; cannot verify from this point.\n",
UnitIndex);
return false;
}
Version = DebugInfoData.getU16(Offset);
if (Version >= 5) {
UnitType = DebugInfoData.getU8(Offset);
AddrSize = DebugInfoData.getU8(Offset);
AbbrOffset = DebugInfoData.getU32(Offset);
ValidType = dwarf::isUnitType(UnitType);
} else {
UnitType = 0;
AbbrOffset = DebugInfoData.getU32(Offset);
AddrSize = DebugInfoData.getU8(Offset);
}
if (!DCtx.getDebugAbbrev()->getAbbreviationDeclarationSet(AbbrOffset))
ValidAbbrevOffset = false;
ValidLength = DebugInfoData.isValidOffset(OffsetStart + Length + 3);
ValidVersion = DWARFContext::isSupportedVersion(Version);
ValidAddrSize = AddrSize == 4 || AddrSize == 8;
if (!ValidLength || !ValidVersion || !ValidAddrSize || !ValidAbbrevOffset ||
!ValidType) {
Success = false;
error() << format("Units[%d] - start offset: 0x%08x \n", UnitIndex,
OffsetStart);
if (!ValidLength)
note() << "The length for this unit is too "
"large for the .debug_info provided.\n";
if (!ValidVersion)
note() << "The 16 bit unit header version is not valid.\n";
if (!ValidType)
note() << "The unit type encoding is not valid.\n";
if (!ValidAbbrevOffset)
note() << "The offset into the .debug_abbrev section is "
"not valid.\n";
if (!ValidAddrSize)
note() << "The address size is unsupported.\n";
}
*Offset = OffsetStart + Length + 4;
return Success;
}
bool DWARFUnitHeader::extract(DWARFContext &Context,
const DWARFDataExtractor &debug_info,
uint32_t *offset_ptr,
DWARFSectionKind SectionKind,
const DWARFUnitIndex *Index) {
Offset = *offset_ptr;
IndexEntry = Index ? Index->getFromOffset(*offset_ptr) : nullptr;
Length = debug_info.getU32(offset_ptr);
// FIXME: Support DWARF64.
unsigned SizeOfLength = 4;
FormParams.Format = DWARF32;
FormParams.Version = debug_info.getU16(offset_ptr);
if (FormParams.Version >= 5) {
UnitType = debug_info.getU8(offset_ptr);
FormParams.AddrSize = debug_info.getU8(offset_ptr);
AbbrOffset = debug_info.getU32(offset_ptr);
} else {
AbbrOffset = debug_info.getRelocatedValue(4, offset_ptr);
FormParams.AddrSize = debug_info.getU8(offset_ptr);
// Fake a unit type based on the section type. This isn't perfect,
// but distinguishing compile and type units is generally enough.
if (SectionKind == DW_SECT_TYPES)
UnitType = DW_UT_type;
else
UnitType = DW_UT_compile;
}
if (IndexEntry) {
if (AbbrOffset)
return false;
auto *UnitContrib = IndexEntry->getOffset();
if (!UnitContrib || UnitContrib->Length != (Length + 4))
return false;
auto *AbbrEntry = IndexEntry->getOffset(DW_SECT_ABBREV);
if (!AbbrEntry)
return false;
AbbrOffset = AbbrEntry->Offset;
}
if (isTypeUnit()) {
TypeHash = debug_info.getU64(offset_ptr);
TypeOffset = debug_info.getU32(offset_ptr);
} else if (UnitType == DW_UT_split_compile || UnitType == DW_UT_skeleton)
DWOId = debug_info.getU64(offset_ptr);
// Header fields all parsed, capture the size of this unit header.
assert(*offset_ptr - Offset <= 255 && "unexpected header size");
Size = uint8_t(*offset_ptr - Offset);
// Type offset is unit-relative; should be after the header and before
// the end of the current unit.
bool TypeOffsetOK =
!isTypeUnit()
? true
: TypeOffset >= Size && TypeOffset < getLength() + SizeOfLength;
bool LengthOK = debug_info.isValidOffset(getNextUnitOffset() - 1);
bool VersionOK = DWARFContext::isSupportedVersion(getVersion());
bool AddrSizeOK = getAddressByteSize() == 4 || getAddressByteSize() == 8;
if (!LengthOK || !VersionOK || !AddrSizeOK || !TypeOffsetOK)
return false;
// Keep track of the highest DWARF version we encounter across all units.
Context.setMaxVersionIfGreater(getVersion());
return true;
}
