[LLVMdev] tablegen multiple inheritance question

[Sean Silva]

Seems to just be a byproduct of TGParser::AddSubClass() begin called
twice. This means that TGParser::AddValue() is being called once for
the "i" of each class, and the "last one wins".

Not sure if it is intended, but this behavior seems to more-or-less
"make sense".

--Sean Silva

On Mon, Jul 2, 2012 at 4:55 PM, reed kotler <rkotler at mips.com> wrote:
> class one {
>    int i = 0;
> }
>
> class two {
>    int i = 1;
> }
>
> class multiple: one, two;
>
> This causes the first i to be ignored and the second i to replace it.
>
> This is a useful property if you want to specialize classes.
>
> But I don't know if it was intended to work that way or not.
>
> For example, if you have an instruction class with no patterns, you can
> merge it with one that defines the pattern and maybe other instruction
> components by building a derived class.
>
> Anybody know if this is intended behavior in tablegen?
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