================
@@ -2400,7 +2402,66 @@ bool Type::isWebAssemblyTableType() const {
return false;
}
-bool Type::isSizelessType() const { return isSizelessBuiltinType(); }
+bool Type::isSizelessType() const {
+ // Check if this type or any of its constituents are sizeless, due to
+ // being a builtin type or individually having the user attribute.
+ // As structs can be recursive, we iterate through without repeats.
+ SmallVector<const Type *, 1> todo = {this};
+ llvm::SmallPtrSet<const Type *, 1> done;
+
+ while (todo.size()) {
+ auto current = todo.pop_back_val();
+ if (done.count(current))
+ continue;
+ done.insert(current);
+
+ // If either this is a known sizeless type from being a builtin
+ // or as marked by the user, this is a sizeless type.
+ if (current->isSizelessBuiltinType())
+ return true;
+ if (current->hasAttr(attr::SizelessType))
+ return true;
+
+ // Otherwise return true if any inner types are sizeless.
+ switch (current->CanonicalType->getTypeClass()) {
+ default:
+ break;
+ case Record: {
+ // A struct with sizeless types is itself sizeless.
+ RecordDecl *Rec = cast<RecordType>(current->CanonicalType)->getDecl();
+
+ // skip incomplete structs
+ if (!Rec->isCompleteDefinition())
+ break;
+
+ // a struct marked sizeless explicitly is sizeless
+ if (Rec->hasAttr<clang::SizelessTypeAttr>())
+ return true;
+
+ // A struct is sizeless if it contains a sizeless field
+ for (auto field : Rec->fields())
+ todo.push_back(field->getType().getTypePtr());
+
+ // A class is sizeless if it contains a sizeless base
+ if (auto CXXRec = dyn_cast<CXXRecordDecl>(Rec))
----------------
tbaederr wrote:
```suggestion
if (const auto *CXXRec = dyn_cast<CXXRecordDecl>(Rec))
```
https://github.com/llvm/llvm-project/pull/71894
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