bool DWARFUnitIndex::parseImpl(DataExtractor IndexData) {
uint32_t Offset = 0;
if (!Header.parse(IndexData, &Offset))
return false;
if (!IndexData.isValidOffsetForDataOfSize(
Offset, Header.NumBuckets * (8 + 4) +
(2 * Header.NumUnits + 1) * 4 * Header.NumColumns))
return false;
Rows = llvm::make_unique<Entry[]>(Header.NumBuckets);
auto Contribs =
llvm::make_unique<Entry::SectionContribution *[]>(Header.NumUnits);
ColumnKinds = llvm::make_unique<DWARFSectionKind[]>(Header.NumColumns);
// Read Hash Table of Signatures
for (unsigned i = 0; i != Header.NumBuckets; ++i)
Rows[i].Signature = IndexData.getU64(&Offset);
// Read Parallel Table of Indexes
for (unsigned i = 0; i != Header.NumBuckets; ++i) {
auto Index = IndexData.getU32(&Offset);
if (!Index)
continue;
Rows[i].Index = this;
Rows[i].Contributions =
llvm::make_unique<Entry::SectionContribution[]>(Header.NumColumns);
Contribs[Index - 1] = Rows[i].Contributions.get();
}
// Read the Column Headers
for (unsigned i = 0; i != Header.NumColumns; ++i) {
ColumnKinds[i] = static_cast<DWARFSectionKind>(IndexData.getU32(&Offset));
if (ColumnKinds[i] == InfoColumnKind) {
if (InfoColumn != -1)
return false;
InfoColumn = i;
}
}
if (InfoColumn == -1)
return false;
// Read Table of Section Offsets
for (unsigned i = 0; i != Header.NumUnits; ++i) {
auto *Contrib = Contribs[i];
for (unsigned i = 0; i != Header.NumColumns; ++i)
Contrib[i].Offset = IndexData.getU32(&Offset);
}
// Read Table of Section Sizes
for (unsigned i = 0; i != Header.NumUnits; ++i) {
auto *Contrib = Contribs[i];
for (unsigned i = 0; i != Header.NumColumns; ++i)
Contrib[i].Length = IndexData.getU32(&Offset);
}
return true;
}
bool DWARFUnitIndex::Header::parse(DataExtractor IndexData,
uint32_t *OffsetPtr) {
if (!IndexData.isValidOffsetForDataOfSize(*OffsetPtr, 16))
return false;
Version = IndexData.getU32(OffsetPtr);
NumColumns = IndexData.getU32(OffsetPtr);
NumUnits = IndexData.getU32(OffsetPtr);
NumBuckets = IndexData.getU32(OffsetPtr);
return Version <= 2;
}