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~