- DestNMD->addOperand(MapMetadata(op, ValueMap, RF_MoveDistinctMDs,
- &TypeMap, &ValMaterializer));
- }
-}
-
-/// Drop DISubprograms that have been superseded.
-///
-/// FIXME: this creates an asymmetric result: we strip functions from losing
-/// subprograms in DstM, but leave losing subprograms in SrcM.
-/// TODO: Remove this logic once the backend can correctly determine canonical
-/// subprograms.
-void ModuleLinker::stripReplacedSubprograms() {
- // Avoid quadratic runtime by returning early when there's nothing to do.
- if (OverridingFunctions.empty())
- return;
-
- // Move the functions now, so the set gets cleared even on early returns.
- auto Functions = std::move(OverridingFunctions);
- OverridingFunctions.clear();
-
- // Drop functions from subprograms if they've been overridden by the new
- // compile unit.
- NamedMDNode *CompileUnits = DstM->getNamedMetadata("llvm.dbg.cu");
- if (!CompileUnits)
- return;
- for (unsigned I = 0, E = CompileUnits->getNumOperands(); I != E; ++I) {
- auto *CU = cast<DICompileUnit>(CompileUnits->getOperand(I));
- assert(CU && "Expected valid compile unit");
-
- for (DISubprogram *SP : CU->getSubprograms()) {
- if (!SP || !SP->getFunction() || !Functions.count(SP->getFunction()))
- continue;
-
- // Prevent DebugInfoFinder from tagging this as the canonical subprogram,
- // since the canonical one is in the incoming module.
- SP->replaceFunction(nullptr);
- }
+ DestNMD->addOperand(MapMetadata(
+ op, ValueMap, RF_MoveDistinctMDs | RF_NullMapMissingGlobalValues,
+ &TypeMap, &ValMaterializer));