Error lto::thinBackend(Config &Conf, unsigned Task, AddStreamFn AddStream,
Module &Mod, ModuleSummaryIndex &CombinedIndex,
const FunctionImporter::ImportMapTy &ImportList,
const GVSummaryMapTy &DefinedGlobals,
MapVector<StringRef, MemoryBufferRef> &ModuleMap) {
Expected<const Target *> TOrErr = initAndLookupTarget(Conf, Mod);
if (!TOrErr)
return TOrErr.takeError();
std::unique_ptr<TargetMachine> TM =
createTargetMachine(Conf, Mod.getTargetTriple(), *TOrErr);
handleAsmUndefinedRefs(Mod, *TM);
if (Conf.CodeGenOnly) {
codegen(Conf, TM.get(), AddStream, Task, Mod);
return Error::success();
}
if (Conf.PreOptModuleHook && !Conf.PreOptModuleHook(Task, Mod))
return Error::success();
renameModuleForThinLTO(Mod, CombinedIndex);
thinLTOResolveWeakForLinkerModule(Mod, DefinedGlobals);
if (Conf.PostPromoteModuleHook && !Conf.PostPromoteModuleHook(Task, Mod))
return Error::success();
if (!DefinedGlobals.empty())
thinLTOInternalizeModule(Mod, DefinedGlobals);
if (Conf.PostInternalizeModuleHook &&
!Conf.PostInternalizeModuleHook(Task, Mod))
return Error::success();
auto ModuleLoader = [&](StringRef Identifier) {
assert(Mod.getContext().isODRUniquingDebugTypes() &&
"ODR Type uniquing should be enabled on the context");
return std::move(getLazyBitcodeModule(ModuleMap[Identifier],
Mod.getContext(),
/*ShouldLazyLoadMetadata=*/true)
.get());
};
FunctionImporter Importer(CombinedIndex, ModuleLoader);
if (Error Err = Importer.importFunctions(Mod, ImportList).takeError())
return Err;
if (Conf.PostImportModuleHook && !Conf.PostImportModuleHook(Task, Mod))
return Error::success();
if (!opt(Conf, TM.get(), Task, Mod, /*IsThinLto=*/true))
return Error::success();
codegen(Conf, TM.get(), AddStream, Task, Mod);
return Error::success();
}
