174   mutable AssertingVH<Function> F;  member in __anonf67519a40111::FunctionNode
179   FunctionNode(Function *F) : F(F), Hash(StructuralHash(*F)) {}  in FunctionNode()  argument
181   Function *getFunc() const { return F; }  in getFunc()
187     F = G;  in replaceBy()
242   void remove(Function *F);
255   void mergeTwoFunctions(Function *F, Function *G);
272   void writeThunk(Function *F, Function *G);
275   void writeAlias(Function *F, Function *G);
279   bool writeThunkOrAlias(Function *F, Function *G);
381 static bool hasDistinctMetadataIntrinsic(const Function &F) {  in hasDistinctMetadataIntrinsic()  argument
382   for (const BasicBlock &BB : F) {  in hasDistinctMetadataIntrinsic()
401 static bool isEligibleForMerging(Function &F) {  in isEligibleForMerging()  argument
402   return !F.isDeclaration() && !F.hasAvailableExternallyLinkage() &&  in isEligibleForMerging()
403          !hasDistinctMetadataIntrinsic(F);  in isEligibleForMerging()
448       Function *F = cast<Function>(I);  in runOnModule()  local
449       if (!F->isDeclaration() && !F->hasAvailableExternallyLinkage()) {  in runOnModule()
450         Changed |= insert(F);  in runOnModule()
649 static bool canCreateThunkFor(Function *F) {  in canCreateThunkFor()  argument
650   if (F->isVarArg())  in canCreateThunkFor()
655   if (F->size() == 1) {  in canCreateThunkFor()
656     if (F->front().sizeWithoutDebug() < 2) {  in canCreateThunkFor()
657       LLVM_DEBUG(dbgs() << "canCreateThunkFor: " << F->getName()  in canCreateThunkFor()
680 void MergeFunctions::writeThunk(Function *F, Function *G) {  in writeThunk()  argument
701     BB = BasicBlock::Create(F->getContext(), "", NewG);  in writeThunk()
708   FunctionType *FFTy = F->getFunctionType();  in writeThunk()
714   CallInst *CI = Builder.CreateCall(F, Args);  in writeThunk()
716   bool isSwiftTailCall = F->getCallingConv() == CallingConv::SwiftTail &&  in writeThunk()
720   CI->setCallingConv(F->getCallingConv());  in writeThunk()
721   CI->setAttributes(F->getAttributes());  in writeThunk()
763 static bool canCreateAliasFor(Function *F) {  in canCreateAliasFor()  argument
764   if (!MergeFunctionsAliases || !F->hasGlobalUnnamedAddr())  in canCreateAliasFor()
768   assert(F->hasLocalLinkage() || F->hasExternalLinkage()  in canCreateAliasFor()
769       || F->hasWeakLinkage() || F->hasLinkOnceLinkage());  in canCreateAliasFor()
774 void MergeFunctions::writeAlias(Function *F, Function *G) {  in writeAlias()  argument
777                                  G->getLinkage(), "", F, G->getParent());  in writeAlias()
779   const MaybeAlign FAlign = F->getAlign();  in writeAlias()
782     F->setAlignment(std::max(FAlign.valueOrOne(), GAlign.valueOrOne()));  in writeAlias()
784     F->setAlignment(std::nullopt);  in writeAlias()
799 bool MergeFunctions::writeThunkOrAlias(Function *F, Function *G) {  in writeThunkOrAlias()  argument
801     writeAlias(F, G);  in writeThunkOrAlias()
804   if (canCreateThunkFor(F)) {  in writeThunkOrAlias()
805     writeThunk(F, G);  in writeThunkOrAlias()
812 void MergeFunctions::mergeTwoFunctions(Function *F, Function *G) {  in mergeTwoFunctions()  argument
813   if (F->isInterposable()) {  in mergeTwoFunctions()
819     if (!canCreateThunkFor(F) &&  in mergeTwoFunctions()
820         (!canCreateAliasFor(F) || !canCreateAliasFor(G)))  in mergeTwoFunctions()
824     Function *NewF = Function::Create(F->getFunctionType(), F->getLinkage(),  in mergeTwoFunctions()
825                                       F->getAddressSpace(), "", F->getParent());  in mergeTwoFunctions()
826     NewF->copyAttributesFrom(F);  in mergeTwoFunctions()
827     NewF->takeName(F);  in mergeTwoFunctions()
829     copyMetadataIfPresent(F, NewF, "type");  in mergeTwoFunctions()
830     copyMetadataIfPresent(F, NewF, "kcfi_type");  in mergeTwoFunctions()
831     removeUsers(F);  in mergeTwoFunctions()
832     F->replaceAllUsesWith(NewF);  in mergeTwoFunctions()
839     writeThunkOrAlias(F, G);  in mergeTwoFunctions()
840     writeThunkOrAlias(F, NewF);  in mergeTwoFunctions()
843       F->setAlignment(std::max(NewFAlign.valueOrOne(), GAlign.valueOrOne()));  in mergeTwoFunctions()
845       F->setAlignment(std::nullopt);  in mergeTwoFunctions()
846     F->setLinkage(GlobalValue::PrivateLinkage);  in mergeTwoFunctions()
862         G->replaceAllUsesWith(F);  in mergeTwoFunctions()
866         replaceDirectCallers(G, F);  in mergeTwoFunctions()
879     if (writeThunkOrAlias(F, G)) {  in mergeTwoFunctions()
888   Function *F = FN.getFunc();  in replaceFunctionInTree()  local
889   assert(FunctionComparator(F, G, &GlobalNumbers).compare() == 0 &&  in replaceFunctionInTree()
892   auto I = FNodesInTree.find(F);  in replaceFunctionInTree()
906 static bool isFuncOrderCorrect(const Function *F, const Function *G) {  in isFuncOrderCorrect()  argument
907   if (F->isInterposable() != G->isInterposable()) {  in isFuncOrderCorrect()
910     return !F->isInterposable();  in isFuncOrderCorrect()
912   if (F->hasLocalLinkage() != G->hasLocalLinkage()) {  in isFuncOrderCorrect()
915     return !F->hasLocalLinkage();  in isFuncOrderCorrect()
920   return F->getName() <= G->getName();  in isFuncOrderCorrect()
941     Function *F = OldF.getFunc();  in insert()  local
943     NewFunction = F;  in insert()
944     assert(OldF.getFunc() != F && "Must have swapped the functions.");  in insert()
957 void MergeFunctions::remove(Function *F) {  in remove()  argument
958   auto I = FNodesInTree.find(F);  in remove()
960     LLVM_DEBUG(dbgs() << "Deferred " << F->getName() << ".\n");  in remove()
965     Deferred.emplace_back(F);  in remove()