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[PDB] Drop LF_PRECOMP from debugTypes earlier 

This is a minor simplification to avoid firing up a BinaryStreamReader
and CVType parser.
This commit is contained in:
Reid Kleckner 2020-09-15 18:50:34 -07:00
parent 5f4abb7fab
commit 1b88845ce1
2 changed files with 2 additions and 10 deletions
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10
lld/COFF/DebugTypes.cpp
View File

@ -447,16 +447,6 @@ UsePrecompSource::mergeDebugT(TypeMerger *m, CVIndexMap *indexMap) {
if (!e)
return e.takeError();
// Drop LF_PRECOMP record from the input stream, as it has been replaced
// with the precompiled headers Type stream in the mergeInPrecompHeaderObj()
// call above. Note that we can't just call Types.drop_front(), as we
// explicitly want to rebase the stream.
CVTypeArray types;
BinaryStreamReader reader(file->debugTypes, support::little);
cantFail(reader.readArray(types, reader.getLength()));
auto firstType = types.begin();
file->debugTypes = file->debugTypes.drop_front(firstType->RecordData.size());
return TpiSource::mergeDebugT(m, indexMap);
}

2
lld/COFF/InputFiles.cpp
View File

@ -821,6 +821,8 @@ void ObjFile::initializeDependencies() {
PrecompRecord precomp = cantFail(
TypeDeserializer::deserializeAs<PrecompRecord>(firstType->data()));
debugTypesObj = makeUsePrecompSource(this, precomp);
// Drop the LF_PRECOMP record from the input stream.
debugTypes = debugTypes.drop_front(firstType->RecordData.size());
return;
}