Optional<DWARFFormValue> DWARFAbbreviationDeclaration::getAttributeValue(
const uint32_t DIEOffset, const dwarf::Attribute Attr,
const DWARFUnit &U) const {
Optional<uint32_t> MatchAttrIndex = findAttributeIndex(Attr);
if (!MatchAttrIndex)
return None;
auto DebugInfoData = U.getDebugInfoExtractor();
// Add the byte size of ULEB that for the abbrev Code so we can start
// skipping the attribute data.
uint32_t Offset = DIEOffset + CodeByteSize;
uint32_t AttrIndex = 0;
for (const auto &Spec : AttributeSpecs) {
if (*MatchAttrIndex == AttrIndex) {
// We have arrived at the attribute to extract, extract if from Offset.
DWARFFormValue FormValue(Spec.Form);
if (Spec.isImplicitConst()) {
FormValue.setSValue(*Spec.ByteSizeOrValue);
return FormValue;
}
if (FormValue.extractValue(DebugInfoData, &Offset, &U))
return FormValue;
}
// March Offset along until we get to the attribute we want.
if (auto FixedSize = Spec.getByteSize(U))
Offset += *FixedSize;
else
DWARFFormValue::skipValue(Spec.Form, DebugInfoData, &Offset,
U.getFormParams());
++AttrIndex;
}
return None;
}
Optional<int64_t> DWARFAbbreviationDeclaration::AttributeSpec::getByteSize(
const DWARFUnit &U) const {
if (isImplicitConst())
return 0;
if (ByteSizeOrValue)
return ByteSizeOrValue;
Optional<int64_t> S;
auto FixedByteSize =
DWARFFormValue::getFixedByteSize(Form, U.getFormParams());
if (FixedByteSize)
S = *FixedByteSize;
return S;
}
bool DWARFDebugInfoEntry::extractFast(const DWARFUnit &U, uint32_t *OffsetPtr,
const DataExtractor &DebugInfoData,
uint32_t UEndOffset, uint32_t D) {
Offset = *OffsetPtr;
Depth = D;
if (Offset >= UEndOffset || !DebugInfoData.isValidOffset(Offset))
return false;
uint64_t AbbrCode = DebugInfoData.getULEB128(OffsetPtr);
if (0 == AbbrCode) {
// NULL debug tag entry.
AbbrevDecl = nullptr;
return true;
}
AbbrevDecl = U.getAbbreviations()->getAbbreviationDeclaration(AbbrCode);
if (nullptr == AbbrevDecl) {
// Restore the original offset.
*OffsetPtr = Offset;
return false;
}
// See if all attributes in this DIE have fixed byte sizes. If so, we can
// just add this size to the offset to skip to the next DIE.
if (Optional<size_t> FixedSize = AbbrevDecl->getFixedAttributesByteSize(U)) {
*OffsetPtr += *FixedSize;
return true;
}
// Skip all data in the .debug_info for the attributes
for (const auto &AttrSpec : AbbrevDecl->attributes()) {
// Check if this attribute has a fixed byte size.
if (auto FixedSize = AttrSpec.getByteSize(U)) {
// Attribute byte size if fixed, just add the size to the offset.
*OffsetPtr += *FixedSize;
} else if (!DWARFFormValue::skipValue(AttrSpec.Form, DebugInfoData,
OffsetPtr, U.getFormParams())) {
// We failed to skip this attribute's value, restore the original offset
// and return the failure status.
*OffsetPtr = Offset;
return false;
}
}
return true;
}
static void dumpAttribute(raw_ostream &OS, const DWARFDie &Die,
uint32_t *OffsetPtr, dwarf::Attribute Attr,
dwarf::Form Form, unsigned Indent,
DIDumpOptions DumpOpts) {
if (!Die.isValid())
return;
const char BaseIndent[] = " ";
OS << BaseIndent;
OS.indent(Indent + 2);
auto attrString = AttributeString(Attr);
if (!attrString.empty())
WithColor(OS, HighlightColor::Attribute) << attrString;
else
WithColor(OS, HighlightColor::Attribute).get()
<< format("DW_AT_Unknown_%x", Attr);
if (DumpOpts.Verbose || DumpOpts.ShowForm) {
auto formString = FormEncodingString(Form);
if (!formString.empty())
OS << " [" << formString << ']';
else
OS << format(" [DW_FORM_Unknown_%x]", Form);
}
DWARFUnit *U = Die.getDwarfUnit();
DWARFFormValue formValue(Form);
if (!formValue.extractValue(U->getDebugInfoExtractor(), OffsetPtr,
U->getFormParams(), U))
return;
OS << "\t(";
StringRef Name;
std::string File;
auto Color = HighlightColor::Enumerator;
if (Attr == DW_AT_decl_file || Attr == DW_AT_call_file) {
Color = HighlightColor::String;
if (const auto *LT = U->getContext().getLineTableForUnit(U))
if (LT->getFileNameByIndex(
formValue.getAsUnsignedConstant().getValue(),
U->getCompilationDir(),
DILineInfoSpecifier::FileLineInfoKind::AbsoluteFilePath, File)) {
File = '"' + File + '"';
Name = File;
}
} else if (Optional<uint64_t> Val = formValue.getAsUnsignedConstant())
Name = AttributeValueString(Attr, *Val);
if (!Name.empty())
WithColor(OS, Color) << Name;
else if (Attr == DW_AT_decl_line || Attr == DW_AT_call_line)
OS << *formValue.getAsUnsignedConstant();
else if (Attr == DW_AT_high_pc && !DumpOpts.ShowForm && !DumpOpts.Verbose &&
formValue.getAsUnsignedConstant()) {
if (DumpOpts.ShowAddresses) {
// Print the actual address rather than the offset.
uint64_t LowPC, HighPC, Index;
if (Die.getLowAndHighPC(LowPC, HighPC, Index))
OS << format("0x%016" PRIx64, HighPC);
else
formValue.dump(OS, DumpOpts);
}
} else if (Attr == DW_AT_location || Attr == DW_AT_frame_base ||
Attr == DW_AT_data_member_location ||
Attr == DW_AT_GNU_call_site_value)
dumpLocation(OS, formValue, U, sizeof(BaseIndent) + Indent + 4, DumpOpts);
else
formValue.dump(OS, DumpOpts);
// We have dumped the attribute raw value. For some attributes
// having both the raw value and the pretty-printed value is
// interesting. These attributes are handled below.
if (Attr == DW_AT_specification || Attr == DW_AT_abstract_origin) {
if (const char *Name = Die.getAttributeValueAsReferencedDie(Attr).getName(
DINameKind::LinkageName))
OS << " \"" << Name << '\"';
} else if (Attr == DW_AT_type) {
OS << " \"";
dumpTypeName(OS, Die);
OS << '"';
} else if (Attr == DW_AT_APPLE_property_attribute) {
if (Optional<uint64_t> OptVal = formValue.getAsUnsignedConstant())
dumpApplePropertyAttribute(OS, *OptVal);
} else if (Attr == DW_AT_ranges) {
const DWARFObject &Obj = Die.getDwarfUnit()->getContext().getDWARFObj();
dumpRanges(Obj, OS, Die.getAddressRanges(), U->getAddressByteSize(),
sizeof(BaseIndent) + Indent + 4, DumpOpts);
}
OS << ")\n";
}
