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 DWARFTypeUnit::extractImpl(const DWARFDataExtractor &debug_info,
uint32_t *offset_ptr) {
if (!DWARFUnit::extractImpl(debug_info, offset_ptr))
return false;
TypeHash = debug_info.getU64(offset_ptr);
TypeOffset = debug_info.getU32(offset_ptr);
// TypeOffset is relative to the beginning of the header,
// so we have to account for the leading length field.
// FIXME: The size of the length field is 12 in DWARF64.
unsigned SizeOfLength = 4;
return TypeOffset < getLength() + SizeOfLength;
}
// Look for a DWARF32-formatted contribution to the string offsets table
// starting at a given offset and record it in a descriptor.
static Optional<StrOffsetsContributionDescriptor>
parseDWARF32StringOffsetsTableHeader(DWARFDataExtractor &DA, uint32_t Offset) {
if (!DA.isValidOffsetForDataOfSize(Offset, 8))
return None;
uint32_t ContributionSize = DA.getU32(&Offset);
if (ContributionSize >= 0xfffffff0)
return None;
uint8_t Version = DA.getU16(&Offset);
(void)DA.getU16(&Offset); // padding
// The encoded length includes the 2-byte version field and the 2-byte
// padding, so we need to subtract them out when we populate the descriptor.
return {{Offset, ContributionSize - 4, Version, DWARF32}};
}
// Look for a DWARF64-formatted contribution to the string offsets table
// starting at a given offset and record it in a descriptor.
static Optional<StrOffsetsContributionDescriptor>
parseDWARF64StringOffsetsTableHeader(DWARFDataExtractor &DA, uint32_t Offset) {
if (!DA.isValidOffsetForDataOfSize(Offset, 16))
return Optional<StrOffsetsContributionDescriptor>();
if (DA.getU32(&Offset) != 0xffffffff)
return Optional<StrOffsetsContributionDescriptor>();
uint64_t Size = DA.getU64(&Offset);
uint8_t Version = DA.getU16(&Offset);
(void)DA.getU16(&Offset); // padding
// The encoded length includes the 2-byte version field and the 2-byte
// padding, so we need to subtract them out when we populate the descriptor.
return StrOffsetsContributionDescriptor(Offset, Size - 4, Version, DWARF64);
//return Optional<StrOffsetsContributionDescriptor>(Descriptor);
}
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 DWARFFormValue::extractValue(const DWARFDataExtractor &Data,
uint32_t *OffsetPtr, DWARFFormParams FP,
const DWARFUnit *CU) {
U = CU;
bool Indirect = false;
bool IsBlock = false;
Value.data = nullptr;
// Read the value for the form into value and follow and DW_FORM_indirect
// instances we run into
do {
Indirect = false;
switch (Form) {
case DW_FORM_addr:
case DW_FORM_ref_addr: {
uint16_t Size =
(Form == DW_FORM_addr) ? FP.AddrSize : FP.getRefAddrByteSize();
Value.uval = Data.getRelocatedValue(Size, OffsetPtr, &Value.SectionIndex);
break;
}
case DW_FORM_exprloc:
case DW_FORM_block:
Value.uval = Data.getULEB128(OffsetPtr);
IsBlock = true;
break;
case DW_FORM_block1:
Value.uval = Data.getU8(OffsetPtr);
IsBlock = true;
break;
case DW_FORM_block2:
Value.uval = Data.getU16(OffsetPtr);
IsBlock = true;
break;
case DW_FORM_block4:
Value.uval = Data.getU32(OffsetPtr);
IsBlock = true;
break;
case DW_FORM_data1:
case DW_FORM_ref1:
case DW_FORM_flag:
case DW_FORM_strx1:
case DW_FORM_addrx1:
Value.uval = Data.getU8(OffsetPtr);
break;
case DW_FORM_data2:
case DW_FORM_ref2:
case DW_FORM_strx2:
case DW_FORM_addrx2:
Value.uval = Data.getU16(OffsetPtr);
break;
case DW_FORM_strx3:
Value.uval = Data.getU24(OffsetPtr);
break;
case DW_FORM_data4:
case DW_FORM_ref4:
case DW_FORM_ref_sup4:
case DW_FORM_strx4:
case DW_FORM_addrx4:
Value.uval = Data.getRelocatedValue(4, OffsetPtr);
break;
case DW_FORM_data8:
case DW_FORM_ref8:
case DW_FORM_ref_sup8:
Value.uval = Data.getU64(OffsetPtr);
break;
case DW_FORM_data16:
// Treat this like a 16-byte block.
Value.uval = 16;
IsBlock = true;
break;
case DW_FORM_sdata:
Value.sval = Data.getSLEB128(OffsetPtr);
break;
case DW_FORM_udata:
case DW_FORM_ref_udata:
Value.uval = Data.getULEB128(OffsetPtr);
break;
case DW_FORM_string:
Value.cstr = Data.getCStr(OffsetPtr);
break;
case DW_FORM_indirect:
Form = static_cast<dwarf::Form>(Data.getULEB128(OffsetPtr));
Indirect = true;
break;
case DW_FORM_strp:
case DW_FORM_sec_offset:
case DW_FORM_GNU_ref_alt:
case DW_FORM_GNU_strp_alt:
case DW_FORM_line_strp:
case DW_FORM_strp_sup: {
Value.uval =
Data.getRelocatedValue(FP.getDwarfOffsetByteSize(), OffsetPtr);
break;
}
case DW_FORM_flag_present:
Value.uval = 1;
break;
case DW_FORM_ref_sig8:
Value.uval = Data.getU64(OffsetPtr);
break;
case DW_FORM_GNU_addr_index:
case DW_FORM_GNU_str_index:
case DW_FORM_strx:
Value.uval = Data.getULEB128(OffsetPtr);
break;
default:
// DWARFFormValue::skipValue() will have caught this and caused all
// DWARF DIEs to fail to be parsed, so this code is not be reachable.
llvm_unreachable("unsupported form");
}
} while (Indirect);
if (IsBlock) {
StringRef Str = Data.getData().substr(*OffsetPtr, Value.uval);
Value.data = nullptr;
if (!Str.empty()) {
Value.data = reinterpret_cast<const uint8_t *>(Str.data());
*OffsetPtr += Value.uval;
}
}
return true;
}
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;
}
bool DWARFDebugLine::Prologue::parse(const DWARFDataExtractor &DebugLineData,
uint32_t *OffsetPtr, const DWARFUnit *U) {
const uint64_t PrologueOffset = *OffsetPtr;
clear();
TotalLength = DebugLineData.getU32(OffsetPtr);
if (TotalLength == UINT32_MAX) {
FormParams.Format = dwarf::DWARF64;
TotalLength = DebugLineData.getU64(OffsetPtr);
} else if (TotalLength >= 0xffffff00) {
return false;
}
FormParams.Version = DebugLineData.getU16(OffsetPtr);
if (getVersion() < 2)
return false;
if (getVersion() >= 5) {
FormParams.AddrSize = DebugLineData.getU8(OffsetPtr);
assert((DebugLineData.getAddressSize() == 0 ||
DebugLineData.getAddressSize() == getAddressSize()) &&
"Line table header and data extractor disagree");
SegSelectorSize = DebugLineData.getU8(OffsetPtr);
}
PrologueLength = DebugLineData.getUnsigned(OffsetPtr, sizeofPrologueLength());
const uint64_t EndPrologueOffset = PrologueLength + *OffsetPtr;
MinInstLength = DebugLineData.getU8(OffsetPtr);
if (getVersion() >= 4)
MaxOpsPerInst = DebugLineData.getU8(OffsetPtr);
DefaultIsStmt = DebugLineData.getU8(OffsetPtr);
LineBase = DebugLineData.getU8(OffsetPtr);
LineRange = DebugLineData.getU8(OffsetPtr);
OpcodeBase = DebugLineData.getU8(OffsetPtr);
StandardOpcodeLengths.reserve(OpcodeBase - 1);
for (uint32_t I = 1; I < OpcodeBase; ++I) {
uint8_t OpLen = DebugLineData.getU8(OffsetPtr);
StandardOpcodeLengths.push_back(OpLen);
}
if (getVersion() >= 5) {
if (!parseV5DirFileTables(DebugLineData, OffsetPtr, EndPrologueOffset,
FormParams, U, HasMD5, IncludeDirectories,
FileNames)) {
fprintf(stderr,
"warning: parsing line table prologue at 0x%8.8" PRIx64
" found an invalid directory or file table description at"
" 0x%8.8" PRIx64 "\n", PrologueOffset, (uint64_t)*OffsetPtr);
return false;
}
} else
parseV2DirFileTables(DebugLineData, OffsetPtr, EndPrologueOffset,
IncludeDirectories, FileNames);
if (*OffsetPtr != EndPrologueOffset) {
fprintf(stderr,
"warning: parsing line table prologue at 0x%8.8" PRIx64
" should have ended at 0x%8.8" PRIx64
" but it ended at 0x%8.8" PRIx64 "\n",
PrologueOffset, EndPrologueOffset, (uint64_t)*OffsetPtr);
return false;
}
return true;
}
Error DWARFDebugLine::Prologue::parse(const DWARFDataExtractor &DebugLineData,
uint32_t *OffsetPtr,
const DWARFContext &Ctx,
const DWARFUnit *U) {
const uint64_t PrologueOffset = *OffsetPtr;
clear();
TotalLength = DebugLineData.getU32(OffsetPtr);
if (TotalLength == UINT32_MAX) {
FormParams.Format = dwarf::DWARF64;
TotalLength = DebugLineData.getU64(OffsetPtr);
} else if (TotalLength >= 0xffffff00) {
return createStringError(errc::invalid_argument,
"parsing line table prologue at offset 0x%8.8" PRIx64
" unsupported reserved unit length found of value 0x%8.8" PRIx64,
PrologueOffset, TotalLength);
}
FormParams.Version = DebugLineData.getU16(OffsetPtr);
if (getVersion() < 2)
return createStringError(errc::not_supported,
"parsing line table prologue at offset 0x%8.8" PRIx64
" found unsupported version 0x%2.2" PRIx16,
PrologueOffset, getVersion());
if (getVersion() >= 5) {
FormParams.AddrSize = DebugLineData.getU8(OffsetPtr);
assert((DebugLineData.getAddressSize() == 0 ||
DebugLineData.getAddressSize() == getAddressSize()) &&
"Line table header and data extractor disagree");
SegSelectorSize = DebugLineData.getU8(OffsetPtr);
}
PrologueLength = DebugLineData.getUnsigned(OffsetPtr, sizeofPrologueLength());
const uint64_t EndPrologueOffset = PrologueLength + *OffsetPtr;
MinInstLength = DebugLineData.getU8(OffsetPtr);
if (getVersion() >= 4)
MaxOpsPerInst = DebugLineData.getU8(OffsetPtr);
DefaultIsStmt = DebugLineData.getU8(OffsetPtr);
LineBase = DebugLineData.getU8(OffsetPtr);
LineRange = DebugLineData.getU8(OffsetPtr);
OpcodeBase = DebugLineData.getU8(OffsetPtr);
StandardOpcodeLengths.reserve(OpcodeBase - 1);
for (uint32_t I = 1; I < OpcodeBase; ++I) {
uint8_t OpLen = DebugLineData.getU8(OffsetPtr);
StandardOpcodeLengths.push_back(OpLen);
}
if (getVersion() >= 5) {
if (!parseV5DirFileTables(DebugLineData, OffsetPtr, EndPrologueOffset,
FormParams, Ctx, U, ContentTypes,
IncludeDirectories, FileNames)) {
return createStringError(errc::invalid_argument,
"parsing line table prologue at 0x%8.8" PRIx64
" found an invalid directory or file table description at"
" 0x%8.8" PRIx64,
PrologueOffset, (uint64_t)*OffsetPtr);
}
} else
parseV2DirFileTables(DebugLineData, OffsetPtr, EndPrologueOffset,
ContentTypes, IncludeDirectories, FileNames);
if (*OffsetPtr != EndPrologueOffset)
return createStringError(errc::invalid_argument,
"parsing line table prologue at 0x%8.8" PRIx64
" should have ended at 0x%8.8" PRIx64
" but it ended at 0x%8.8" PRIx64,
PrologueOffset, EndPrologueOffset, (uint64_t)*OffsetPtr);
return Error::success();
}