================
@@ -907,6 +910,45 @@ RValue ZOSXPLinkABIInfo::EmitVAArg(CodeGenFunction &CGF,
Address VAListAddr,
/*allowHigherAlign*/ false, Slot);
}
+RValue ZOSXPLinkABIInfo::EmitZOSVAArg(CodeGenFunction &CGF, Address VAListAddr,
+ QualType ArgTy, AggValueSlot Slot) const
{
+ // Assume that va_list type is correct; should be pointer
+ // to LLVM type: [2 x i8*].
+ llvm::Type *VAListTy =
+ CGF.ConvertType(getContext().getBuiltinZOSVaListType());
+ VAListAddr = VAListAddr.withElementType(VAListTy);
+ Address Curr = CGF.Builder.CreateConstArrayGEP(VAListAddr, 0,
"va_list.curr");
+ Address Next = CGF.Builder.CreateConstArrayGEP(VAListAddr, 1,
"va_list.next");
+
+ // Get information about the argument type.
+ auto ArgTyInfo = CGF.getContext().getTypeInfoInChars(ArgTy);
+ CharUnits ArgTySize = ArgTyInfo.Width;
+
+ llvm::Type *Ty = CGF.ConvertTypeForMem(ArgTy);
+
+ // Slot size is the same as the size of a pointer.
+ CharUnits SlotSize = CGF.getPointerSize();
+
+ // Align next and copy to curr.
+ CharUnits PtrAlign = CGF.getPointerAlign();
+ llvm::Value *OldNext = CGF.Builder.CreateLoad(Next, "arg.next");
+ Address Addr = Address(emitRoundPointerUpToAlignment(CGF, OldNext, PtrAlign),
+ CGF.Int8Ty, PtrAlign);
+ CGF.Builder.CreateStore(Addr.emitRawPointer(CGF), Curr);
+
+ // Advance next and store.
+ Address NextPtr = CGF.Builder.CreateConstInBoundsByteGEP(
+ Addr, ArgTySize.isZero() ? SlotSize : ArgTySize, "arg.next.next");
+ CGF.Builder.CreateStore(NextPtr.emitRawPointer(CGF), Next);
+
+ // Fetch next arg
----------------
redstar wrote:
```suggestion
// Fetch next argument.
```
https://github.com/llvm/llvm-project/pull/202397
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