bulbazord added a comment. In D153657#4449608 <https://reviews.llvm.org/D153657#4449608>, @jingham wrote:
> In D153657#4445292 <https://reviews.llvm.org/D153657#4445292>, @bulbazord > wrote: > >> I think this patch is probably okay to do, but it does break a supported use >> case that I'm aware of: One way you can do "object oriented programming" in >> C is to do exactly what you're trying to prevent. Using the test, you could >> say that "MyStruct" is the base class and "MyBiggerStruct" would be a >> derived class. You might have a pointer to a "MyStruct" object, even though >> you called `malloc(sizeof(MyBiggerStruct))`, and maybe you can perform that >> cast if you're sure that you actually have a `MyBiggerStruct` object. >> >> I know there's not necessarily a good way to support that without also >> supporting the bug you're trying to fix though. :( > > You can't actually cast structures to structures in C. You can only cast > pointers. So in your underlying code you always have to have pointers around > if you are playing these games, and you can cast the pointer to the derived > type and then dereference it, which is what you would have had to do in the > source language anyway. Right, this makes sense, that was my disconnect. Thanks for clarifying and helping me understand! Repository: rG LLVM Github Monorepo CHANGES SINCE LAST ACTION https://reviews.llvm.org/D153657/new/ https://reviews.llvm.org/D153657 _______________________________________________ lldb-commits mailing list lldb-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/lldb-commits
