================
@@ -449,4 +449,50 @@ LValue CIRGenFunction::emitLValue(const Expr *e) {
}
}
+void CIRGenFunction::emitNullInitialization(mlir::Location loc, Address
destPtr,
+ QualType ty) {
+ // Ignore empty classes in C++.
+ if (getLangOpts().CPlusPlus) {
+ if (const RecordType *rt = ty->getAs<RecordType>()) {
+ if (cast<CXXRecordDecl>(rt->getDecl())->isEmpty())
+ return;
+ }
+ }
+
+ // Cast the dest ptr to the appropriate i8 pointer type.
+ if (builder.isInt8Ty(destPtr.getElementType())) {
+ llvm_unreachable("NYI");
+ }
+
+ // Get size and alignment info for this aggregate.
+ const CharUnits size = getContext().getTypeSizeInChars(ty);
+ if (size.isZero()) {
+ // But note that getTypeInfo returns 0 for a VLA.
+ if (const VariableArrayType *vlatype = dyn_cast_or_null<VariableArrayType>(
+ getContext().getAsArrayType(ty))) {
+ cgm.errorNYI(loc,
+ "emitNullInitialization for zero size VariableArrayType");
+ } else {
+ return;
+ }
+ }
+
+ // If the type contains a pointer to data member we can't memset it to zero.
+ // Instead, create a null constant and copy it to the destination.
+ // TODO: there are other patterns besides zero that we can usefully memset,
+ // like -1, which happens to be the pattern used by member-pointers.
+ if (!cgm.getTypes().isZeroInitializable(ty)) {
+ cgm.errorNYI(loc, "type is not zero initializable");
+ }
+
+ // In LLVM Codegen: otherwise, just memset the whole thing to zero using
+ // Builder.CreateMemSet. In CIR just emit a store of #cir.zero to the
+ // respective address.
+ // Builder.CreateMemSet(DestPtr, Builder.getInt8(0), SizeVal, false);
+ auto zeroAttr = cir::ZeroAttr::get(builder.getContext(), convertType(ty));
+ auto zeroValue =
----------------
xlauko wrote:
Use `builder.getNullValue` instead explicit operation creation and duplicit
type conversion.
https://github.com/llvm/llvm-project/pull/132974
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