================
@@ -1511,3 +1532,258 @@ void
CIRABIRewriteContext::rewriteFunctionAddress(cir::GetGlobalOp addrOp,
cir::CastKind::bitcast, addrOp.getAddr());
addrOp.getAddr().replaceAllUsesExcept(bitcast.getResult(), bitcast);
}
+
+mlir::LogicalResult
+CIRABIRewriteContext::rewriteVAArg(mlir::Operation *vaArgOp,
+ const ArgClassification &ac,
+ mlir::OpBuilder &opBuilder) {
+ auto op = mlir::cast<cir::VAArgOp>(vaArgOp);
+ CIRBaseBuilderTy builder(opBuilder);
+ mlir::Location loc = op.getLoc();
+ mlir::Type resultTy = op.getType();
+ mlir::Value valist = op.getArgList();
+
+ auto reportNYI = [&](llvm::StringRef what) {
+ op->emitOpError() << "va_arg of " << what
+ << " not yet implemented in CallConvLowering";
+ return mlir::failure();
+ };
+
+ // An ignored type is passed in no register and no stack slot, so the fetch
+ // has nothing to read and must leave the va_list cursor where it found it,
+ // for the fetches that come after this one. The type holds no bytes, so
+ // the value the fetch produces carries no information either.
+ if (ac.kind == ArgKind::Ignore) {
+ builder.setInsertionPoint(op);
+ op.getResult().replaceAllUsesWith(builder.createDummyValue(
----------------
adams381 wrote:
Yes. It is `cir.const #cir.poison` now.
https://github.com/llvm/llvm-project/pull/222420
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