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Re: imcc hack for perl6 regexes

Sean O'Rourke
August 21, 2002 09:17
Re: imcc hack for perl6 regexes
Message ID:
On Wed, 21 Aug 2002, Angel Faus wrote:
> About the implementation, I think we will need the following metadata about
> each op:
> i) the opcode, and the op name.
> ii) the type of arguments, including in/out/etc..

Both of these are available, though there currently isn't an efficient
interface to say "give me all possible sets of parameter types for an op
called 'X'" -- you can only look up the op quickly if you know the exact
parameter types.  This lookup would be easy to add, though.

> iii) whether the opcode has side-effects or not.

This, unfortunately, is not available.  Since many ops just call into
vtable methods, it would need to be set in stone in the vtable doc as
well, e.g. "the add op MUST NOT appear to have a side-effect", and vtable
writers would need to take this into account.

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