[CodeGen] Remove default ctors for InputArg and OutputArg (llvm#153205)

These make it easy to forget to initialize some members, like the newly
added OrigTy. Force these to always go through the ctor instead.

Author: nikic

llvm/include/llvm/CodeGen/TargetCallingConv.h

@@ -205,8 +205,8 @@ namespace ISD {
     ArgFlagsTy Flags;
     MVT VT = MVT::Other;
     EVT ArgVT;
-    Type *OrigTy = nullptr;
-    bool Used = false;
+    Type *OrigTy;
+    bool Used;
 
     /// Index original Function's argument.
     unsigned OrigArgIndex;
@@ -218,14 +218,10 @@ namespace ISD {
     /// registers, we got 4 InputArgs with PartOffsets 0, 4, 8 and 12.
     unsigned PartOffset;
 
-    InputArg() = default;
-    InputArg(ArgFlagsTy flags, EVT vt, EVT argvt, Type *OrigTy, bool used,
-             unsigned origIdx, unsigned partOffs)
-        : Flags(flags), OrigTy(OrigTy), Used(used), OrigArgIndex(origIdx),
-          PartOffset(partOffs) {
-      VT = vt.getSimpleVT();
-      ArgVT = argvt;
-    }
+    InputArg(ArgFlagsTy Flags, MVT VT, EVT ArgVT, Type *OrigTy, bool Used,
+             unsigned OrigArgIndex, unsigned PartOffset)
+        : Flags(Flags), VT(VT), ArgVT(ArgVT), OrigTy(OrigTy), Used(Used),
+          OrigArgIndex(OrigArgIndex), PartOffset(PartOffset) {}
 
     bool isOrigArg() const {
       return OrigArgIndex != NoArgIndex;
@@ -245,7 +241,7 @@ namespace ISD {
     ArgFlagsTy Flags;
     MVT VT;
     EVT ArgVT;
-    Type *OrigTy = nullptr;
+    Type *OrigTy;
 
     /// Index original Function's argument.
     unsigned OrigArgIndex;
@@ -255,14 +251,10 @@ namespace ISD {
     /// registers, we got 4 OutputArgs with PartOffsets 0, 4, 8 and 12.
     unsigned PartOffset;
 
-    OutputArg() = default;
-    OutputArg(ArgFlagsTy flags, MVT vt, EVT argvt, Type *OrigTy,
-              unsigned origIdx, unsigned partOffs)
-        : Flags(flags), OrigTy(OrigTy), OrigArgIndex(origIdx),
-          PartOffset(partOffs) {
-      VT = vt;
-      ArgVT = argvt;
-    }
+    OutputArg(ArgFlagsTy Flags, MVT VT, EVT ArgVT, Type *OrigTy,
+              unsigned OrigArgIndex, unsigned PartOffset)
+        : Flags(Flags), VT(VT), ArgVT(ArgVT), OrigTy(OrigTy),
+          OrigArgIndex(OrigArgIndex), PartOffset(PartOffset) {}
   };
 
 } // end namespace ISD

llvm/lib/CodeGen/SelectionDAG/FastISel.cpp

@@ -1012,17 +1012,16 @@ bool FastISel::lowerCallTo(CallLoweringInfo &CLI) {
     MVT RegisterVT = TLI.getRegisterType(CLI.RetTy->getContext(), VT);
     unsigned NumRegs = TLI.getNumRegisters(CLI.RetTy->getContext(), VT);
     for (unsigned i = 0; i != NumRegs; ++i) {
-      ISD::InputArg MyFlags;
-      MyFlags.VT = RegisterVT;
-      MyFlags.ArgVT = VT;
-      MyFlags.Used = CLI.IsReturnValueUsed;
+      ISD::ArgFlagsTy Flags;
       if (CLI.RetSExt)
-        MyFlags.Flags.setSExt();
+        Flags.setSExt();
       if (CLI.RetZExt)
-        MyFlags.Flags.setZExt();
+        Flags.setZExt();
       if (CLI.IsInReg)
-        MyFlags.Flags.setInReg();
-      CLI.Ins.push_back(MyFlags);
+        Flags.setInReg();
+      ISD::InputArg Ret(Flags, RegisterVT, VT, CLI.RetTy, CLI.IsReturnValueUsed,
+                        ISD::InputArg::NoArgIndex, 0);
+      CLI.Ins.push_back(Ret);
     }
   }
 

llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp

@@ -11069,23 +11069,20 @@ TargetLowering::LowerCallTo(TargetLowering::CallLoweringInfo &CLI) const {
       unsigned NumRegs = getNumRegistersForCallingConv(CLI.RetTy->getContext(),
                                                        CLI.CallConv, VT);
       for (unsigned i = 0; i != NumRegs; ++i) {
-        ISD::InputArg MyFlags;
-        MyFlags.Flags = Flags;
-        MyFlags.VT = RegisterVT;
-        MyFlags.ArgVT = VT;
-        MyFlags.Used = CLI.IsReturnValueUsed;
+        ISD::InputArg Ret(Flags, RegisterVT, VT, CLI.RetTy,
+                          CLI.IsReturnValueUsed, ISD::InputArg::NoArgIndex, 0);
         if (CLI.RetTy->isPointerTy()) {
-          MyFlags.Flags.setPointer();
-          MyFlags.Flags.setPointerAddrSpace(
+          Ret.Flags.setPointer();
+          Ret.Flags.setPointerAddrSpace(
               cast<PointerType>(CLI.RetTy)->getAddressSpace());
         }
         if (CLI.RetSExt)
-          MyFlags.Flags.setSExt();
+          Ret.Flags.setSExt();
         if (CLI.RetZExt)
-          MyFlags.Flags.setZExt();
+          Ret.Flags.setZExt();
         if (CLI.IsInReg)
-          MyFlags.Flags.setInReg();
-        CLI.Ins.push_back(MyFlags);
+          Ret.Flags.setInReg();
+        CLI.Ins.push_back(Ret);
       }
     }
   }
@@ -11095,11 +11092,12 @@ TargetLowering::LowerCallTo(TargetLowering::CallLoweringInfo &CLI) const {
   if (supportSwiftError()) {
     for (const ArgListEntry &Arg : Args) {
       if (Arg.IsSwiftError) {
-        ISD::InputArg MyFlags;
-        MyFlags.VT = getPointerTy(DL);
-        MyFlags.ArgVT = EVT(getPointerTy(DL));
-        MyFlags.Flags.setSwiftError();
-        CLI.Ins.push_back(MyFlags);
+        ISD::ArgFlagsTy Flags;
+        Flags.setSwiftError();
+        ISD::InputArg Ret(Flags, getPointerTy(DL), EVT(getPointerTy(DL)),
+                          PointerType::getUnqual(CLI.RetTy->getContext()),
+                          /*Used=*/true, ISD::InputArg::NoArgIndex, 0);
+        CLI.Ins.push_back(Ret);
       }
     }
   }

llvm/lib/Target/WebAssembly/WebAssemblyISelLowering.cpp

@@ -1320,18 +1320,21 @@ WebAssemblyTargetLowering::LowerCall(CallLoweringInfo &CLI,
   // signature They are necessary to match callee and caller signature for
   // indirect call.
   if (CallConv == CallingConv::Swift) {
+    Type *PtrTy = PointerType::getUnqual(*DAG.getContext());
     if (!HasSwiftSelfArg) {
       NumFixedArgs++;
-      ISD::OutputArg Arg;
-      Arg.Flags.setSwiftSelf();
+      ISD::ArgFlagsTy Flags;
+      Flags.setSwiftSelf();
+      ISD::OutputArg Arg(Flags, PtrVT, EVT(PtrVT), PtrTy, 0, 0);
       CLI.Outs.push_back(Arg);
       SDValue ArgVal = DAG.getUNDEF(PtrVT);
       CLI.OutVals.push_back(ArgVal);
     }
     if (!HasSwiftErrorArg) {
       NumFixedArgs++;
-      ISD::OutputArg Arg;
-      Arg.Flags.setSwiftError();
+      ISD::ArgFlagsTy Flags;
+      Flags.setSwiftError();
+      ISD::OutputArg Arg(Flags, PtrVT, EVT(PtrVT), PtrTy, 0, 0);
       CLI.Outs.push_back(Arg);
       SDValue ArgVal = DAG.getUNDEF(PtrVT);
       CLI.OutVals.push_back(ArgVal);