Re: inline expressions for decodetree !function syntax

[Richard Henderson]

On 7/15/21 2:33 AM, Peter Maydell wrote:
> I have found myself wondering whether it would be a good idea for
> decodetree to support some minimal syntax for defining constant-modifying
> functions inline in the decode file, so that instead of writing
>
>     %imm4_16_p1 16:4 !function=plus_1
>
> and then having to define a "plus_1" function somewhere in a .c file,
> you could write something like
>
>     %imm4_16_p1 16:4 !function="x + 1"
>
> and decodetree would just wrap the quoted string in
>   "static inline int fnname(DisasContext *s, int x) {return %s;}"
> (autogenerating a unique function name for it).

Seems workable.

> (target/arm actually has three separate implementations of
> the "add 1" function right now :-))

Ew.  :-)


r~