128 bool DeadArgumentEliminationPass::deleteDeadVarargs(Function &F) {  in deleteDeadVarargs()  argument
129   assert(F.getFunctionType()->isVarArg() && "Function isn't varargs!");  in deleteDeadVarargs()
130   if (F.isDeclaration() || !F.hasLocalLinkage())  in deleteDeadVarargs()
134   if (F.hasAddressTaken())  in deleteDeadVarargs()
140   if (F.hasFnAttribute(Attribute::Naked)) {  in deleteDeadVarargs()
146   for (BasicBlock &BB : F) {  in deleteDeadVarargs()
165   FunctionType *FTy = F.getFunctionType();  in deleteDeadVarargs()
172   Function *NF = Function::Create(NFTy, F.getLinkage(), F.getAddressSpace());  in deleteDeadVarargs()
173   NF->copyAttributesFrom(&F);  in deleteDeadVarargs()
174   NF->setComdat(F.getComdat());  in deleteDeadVarargs()
175   F.getParent()->getFunctionList().insert(F.getIterator(), NF);  in deleteDeadVarargs()
176   NF->takeName(&F);  in deleteDeadVarargs()
177   NF->IsNewDbgInfoFormat = F.IsNewDbgInfoFormat;  in deleteDeadVarargs()
183   for (User *U : llvm::make_early_inc_range(F.users())) {  in deleteDeadVarargs()
197       PAL = AttributeList::get(F.getContext(), PAL.getFnAttrs(),  in deleteDeadVarargs()
232   NF->splice(NF->begin(), &F);  in deleteDeadVarargs()
237   for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(),  in deleteDeadVarargs()
247   F.getAllMetadata(MDs);  in deleteDeadVarargs()
252   F.replaceAllUsesWith(NF);  in deleteDeadVarargs()
257   F.eraseFromParent();  in deleteDeadVarargs()
263 bool DeadArgumentEliminationPass::removeDeadArgumentsFromCallers(Function &F) {  in removeDeadArgumentsFromCallers()  argument
275   if (!F.hasExactDefinition())  in removeDeadArgumentsFromCallers()
282   if ((F.hasLocalLinkage() && !LiveFunctions.count(&F)) &&  in removeDeadArgumentsFromCallers()
283       !F.getFunctionType()->isVarArg())  in removeDeadArgumentsFromCallers()
289   if (F.hasFnAttribute(Attribute::Naked))  in removeDeadArgumentsFromCallers()
292   if (F.use_empty())  in removeDeadArgumentsFromCallers()
300   for (Argument &Arg : F.args()) {  in removeDeadArgumentsFromCallers()
308       F.removeParamAttrs(Arg.getArgNo(), UBImplyingAttributes);  in removeDeadArgumentsFromCallers()
315   for (Use &U : F.uses()) {  in removeDeadArgumentsFromCallers()
318         CB->getFunctionType() != F.getFunctionType())  in removeDeadArgumentsFromCallers()
340 static unsigned numRetVals(const Function *F) {  in numRetVals()  argument
341   Type *RetTy = F->getReturnType();  in numRetVals()
354 static Type *getRetComponentType(const Function *F, unsigned Idx) {  in getRetComponentType()  argument
355   Type *RetTy = F->getReturnType();  in getRetComponentType()
396     const Function *F = RI->getParent()->getParent();  in surveyUse()  local
398       RetOrArg Use = createRet(F, RetValNum);  in surveyUse()
404     for (unsigned Ri = 0; Ri < numRetVals(F); ++Ri) {  in surveyUse()
405       RetOrArg Use = createRet(F, Ri);  in surveyUse()
438     const Function *F = CB->getCalledFunction();  in surveyUse()  local
439     if (F) {  in surveyUse()
452       if (ArgNo >= F->getFunctionType()->getNumParams())  in surveyUse()
461       RetOrArg Use = createArg(F, ArgNo);  in surveyUse()
495 void DeadArgumentEliminationPass::surveyFunction(const Function &F) {  in surveyFunction()  argument
498   if (F.getAttributes().hasAttrSomewhere(Attribute::InAlloca) ||  in surveyFunction()
499       F.getAttributes().hasAttrSomewhere(Attribute::Preallocated)) {  in surveyFunction()
500     markLive(F);  in surveyFunction()
507   if (F.hasFnAttribute(Attribute::Naked)) {  in surveyFunction()
508     markLive(F);  in surveyFunction()
512   unsigned RetCount = numRetVals(&F);  in surveyFunction()
527   for (const BasicBlock &BB : F) {  in surveyFunction()
536         markLive(F);  in surveyFunction()
543     LLVM_DEBUG(dbgs() << "DeadArgumentEliminationPass - " << F.getName()  in surveyFunction()
547   if (!F.hasLocalLinkage() && (!ShouldHackArguments || F.isIntrinsic())) {  in surveyFunction()
548     markLive(F);  in surveyFunction()
554              << F.getName() << "\n");  in surveyFunction()
562   for (const Use &U : F.uses()) {  in surveyFunction()
567         CB->getFunctionType() != F.getFunctionType()) {  in surveyFunction()
568       markLive(F);  in surveyFunction()
615     LLVM_DEBUG(dbgs() << "DeadArgumentEliminationPass - " << F.getName()  in surveyFunction()
621     markValue(createRet(&F, Ri), RetValLiveness[Ri], MaybeLiveRetUses[Ri]);  in surveyFunction()
624                     << F.getName() << "\n");  in surveyFunction()
629   for (Function::const_arg_iterator AI = F.arg_begin(), E = F.arg_end();  in surveyFunction()
632     if (F.getFunctionType()->isVarArg() || HasMustTailCallers ||  in surveyFunction()
653     markValue(createArg(&F, ArgI), Result, MaybeLiveArgUses);  in surveyFunction()
687 void DeadArgumentEliminationPass::markLive(const Function &F) {  in markLive()  argument
689                     << F.getName() << "\n");  in markLive()
691   LiveFunctions.insert(&F);  in markLive()
693   for (unsigned ArgI = 0, E = F.arg_size(); ArgI != E; ++ArgI)  in markLive()
694     propagateLiveness(createArg(&F, ArgI));  in markLive()
696   for (unsigned Ri = 0, E = numRetVals(&F); Ri != E; ++Ri)  in markLive()
697     propagateLiveness(createRet(&F, Ri));  in markLive()
714   return LiveFunctions.count(RA.F) || LiveValues.count(RA);  in isLive()
737 bool DeadArgumentEliminationPass::removeDeadStuffFromFunction(Function *F) {  in removeDeadStuffFromFunction()  argument
739   if (LiveFunctions.count(F))  in removeDeadStuffFromFunction()
744   FunctionType *FTy = F->getFunctionType();  in removeDeadStuffFromFunction()
752   const AttributeList &PAL = F->getAttributes();  in removeDeadStuffFromFunction()
760   for (Function::arg_iterator I = F->arg_begin(), E = F->arg_end(); I != E;  in removeDeadStuffFromFunction()
762     RetOrArg Arg = createArg(F, ArgI);  in removeDeadStuffFromFunction()
772                         << F->getName() << "\n");  in removeDeadStuffFromFunction()
779   unsigned RetCount = numRetVals(F);  in removeDeadStuffFromFunction()
809       RetOrArg Ret = createRet(F, Ri);  in removeDeadStuffFromFunction()
811         RetTypes.push_back(getRetComponentType(F, Ri));  in removeDeadStuffFromFunction()
817                    << Ri << " from " << F->getName() << "\n");  in removeDeadStuffFromFunction()
836       NRetTy = Type::getVoidTy(F->getContext());  in removeDeadStuffFromFunction()
842   AttrBuilder RAttrs(F->getContext(), PAL.getRetAttrs());  in removeDeadStuffFromFunction()
854   AttributeSet RetAttrs = AttributeSet::get(F->getContext(), RAttrs);  in removeDeadStuffFromFunction()
858       PAL.getFnAttrs().removeAttribute(F->getContext(), Attribute::AllocSize);  in removeDeadStuffFromFunction()
863       AttributeList::get(F->getContext(), FnAttrs, RetAttrs, ArgAttrVec);  in removeDeadStuffFromFunction()
873   Function *NF = Function::Create(NFTy, F->getLinkage(), F->getAddressSpace());  in removeDeadStuffFromFunction()
874   NF->copyAttributesFrom(F);  in removeDeadStuffFromFunction()
875   NF->setComdat(F->getComdat());  in removeDeadStuffFromFunction()
879   F->getParent()->getFunctionList().insert(F->getIterator(), NF);  in removeDeadStuffFromFunction()
880   NF->takeName(F);  in removeDeadStuffFromFunction()
881   NF->IsNewDbgInfoFormat = F->IsNewDbgInfoFormat;  in removeDeadStuffFromFunction()
886   while (!F->use_empty()) {  in removeDeadStuffFromFunction()
887     CallBase &CB = cast<CallBase>(*F->user_back());  in removeDeadStuffFromFunction()
894     AttrBuilder RAttrs(F->getContext(), CallPAL.getRetAttrs());  in removeDeadStuffFromFunction()
896     AttributeSet RetAttrs = AttributeSet::get(F->getContext(), RAttrs);  in removeDeadStuffFromFunction()
916               F->getContext(), AttrBuilder(F->getContext(), Attrs)  in removeDeadStuffFromFunction()
936         F->getContext(), Attribute::AllocSize);  in removeDeadStuffFromFunction()
939         AttributeList::get(F->getContext(), FnAttrs, RetAttrs, ArgAttrVec);  in removeDeadStuffFromFunction()
1015   NF->splice(NF->begin(), F);  in removeDeadStuffFromFunction()
1020   for (Function::arg_iterator I = F->arg_begin(), E = F->arg_end(),  in removeDeadStuffFromFunction()
1038   if (F->getReturnType() != NF->getReturnType())  in removeDeadStuffFromFunction()
1073         auto *NewRet = ReturnInst::Create(F->getContext(), RetVal, RI);  in removeDeadStuffFromFunction()
1080   F->getAllMetadata(MDs);  in removeDeadStuffFromFunction()
1095   F->eraseFromParent();  in removeDeadStuffFromFunction()
1107     for (const auto *F : NewLiveFuncs)  in propagateVirtMustcallLiveness()  local
1108       for (const auto *U : F->users())  in propagateVirtMustcallLiveness()
1115     for (const auto *F : Temp)  in propagateVirtMustcallLiveness()  local
1116       markLive(*F);  in propagateVirtMustcallLiveness()
1129   for (Function &F : llvm::make_early_inc_range(M))  in run()
1130     if (F.getFunctionType()->isVarArg())  in run()
1131       Changed |= deleteDeadVarargs(F);  in run()
1137   for (auto &F : M)  in run()  local
1138     surveyFunction(F);  in run()
1145   for (Function &F : llvm::make_early_inc_range(M))  in run()
1146     Changed |= removeDeadStuffFromFunction(&F);  in run()
1150   for (auto &F : M)  in run()  local
1151     Changed |= removeDeadArgumentsFromCallers(F);  in run()