// Add all object files to the PDB. Merge .debug$T sections into IpiData and
// TpiData.
static void addObjectsToPDB(BumpPtrAllocator &Alloc, SymbolTable *Symtab,
pdb::PDBFileBuilder &Builder,
TypeTableBuilder &TypeTable,
TypeTableBuilder &IDTable) {
// Follow type servers. If the same type server is encountered more than
// once for this instance of `PDBTypeServerHandler` (for example if many
// object files reference the same TypeServer), the types from the
// TypeServer will only be visited once.
pdb::PDBTypeServerHandler Handler;
// PDBs use a single global string table for filenames in the file checksum
// table.
auto PDBStrTab = std::make_shared<DebugStringTableSubsection>();
// Visit all .debug$T sections to add them to Builder.
for (ObjectFile *File : Symtab->ObjectFiles) {
// Add a module descriptor for every object file. We need to put an absolute
// path to the object into the PDB. If this is a plain object, we make its
// path absolute. If it's an object in an archive, we make the archive path
// absolute.
bool InArchive = !File->ParentName.empty();
SmallString<128> Path = InArchive ? File->ParentName : File->getName();
sys::fs::make_absolute(Path);
StringRef Name = InArchive ? File->getName() : StringRef(Path);
File->ModuleDBI = &ExitOnErr(Builder.getDbiBuilder().addModuleInfo(Name));
File->ModuleDBI->setObjFileName(Path);
// Before we can process symbol substreams from .debug$S, we need to process
// type information, file checksums, and the string table. Add type info to
// the PDB first, so that we can get the map from object file type and item
// indices to PDB type and item indices.
SmallVector<TypeIndex, 128> TypeIndexMap;
mergeDebugT(File, IDTable, TypeTable, TypeIndexMap, Handler);
// Now do all line info.
for (SectionChunk *DebugChunk : File->getDebugChunks()) {
if (!DebugChunk->isLive() || DebugChunk->getSectionName() != ".debug$S")
continue;
ArrayRef<uint8_t> RelocatedDebugContents =
relocateDebugChunk(Alloc, DebugChunk);
if (RelocatedDebugContents.empty())
continue;
DebugSubsectionArray Subsections;
BinaryStreamReader Reader(RelocatedDebugContents, support::little);
ExitOnErr(Reader.readArray(Subsections, RelocatedDebugContents.size()));
DebugStringTableSubsectionRef CVStrTab;
DebugChecksumsSubsectionRef Checksums;
for (const DebugSubsectionRecord &SS : Subsections) {
switch (SS.kind()) {
case DebugSubsectionKind::StringTable:
ExitOnErr(CVStrTab.initialize(SS.getRecordData()));
break;
case DebugSubsectionKind::FileChecksums:
ExitOnErr(Checksums.initialize(SS.getRecordData()));
break;
case DebugSubsectionKind::Lines:
// We can add the relocated line table directly to the PDB without
// modification because the file checksum offsets will stay the same.
File->ModuleDBI->addDebugSubsection(SS);
break;
case DebugSubsectionKind::Symbols:
mergeSymbolRecords(Alloc, File, TypeIndexMap, SS.getRecordData());
break;
default:
// FIXME: Process the rest of the subsections.
break;
}
}
if (Checksums.valid()) {
// Make a new file checksum table that refers to offsets in the PDB-wide
// string table. Generally the string table subsection appears after the
// checksum table, so we have to do this after looping over all the
// subsections.
if (!CVStrTab.valid())
fatal(".debug$S sections must have both a string table subsection "
"and a checksum subsection table or neither");
auto NewChecksums =
make_unique<DebugChecksumsSubsection>(*PDBStrTab);
for (FileChecksumEntry &FC : Checksums) {
StringRef FileName = ExitOnErr(CVStrTab.getString(FC.FileNameOffset));
ExitOnErr(Builder.getDbiBuilder().addModuleSourceFile(
*File->ModuleDBI, FileName));
NewChecksums->addChecksum(FileName, FC.Kind, FC.Checksum);
}
File->ModuleDBI->addDebugSubsection(std::move(NewChecksums));
}
}
}
Builder.getStringTableBuilder().setStrings(*PDBStrTab);
// Construct TPI stream contents.
addTypeInfo(Builder.getTpiBuilder(), TypeTable);
// Construct IPI stream contents.
addTypeInfo(Builder.getIpiBuilder(), IDTable);
}
