On Thu, 16 Nov 2023 12:20:48 +0100
Christian Schoenebeck <[email protected]> wrote:
> "skeleton" refers to the common structure and parts of generated
> parsers that are independent of the specified tokens and grammar
> (i.e. language), so simply spoken the portions that are (more or
> less) copied verbatim, [...]
Yes, from 1000 feet up, I can imagine there is such a thing.
According to Arthur Clarke, ?Any sufficiently advanced technology is
indistinguishable from magic?. That's pretty much my understanding of
how Bison works.
> > or when exactly I can depend on $$ = $1 having been executed.
> You mean the exact *order* of actions being executed, not whether or
> not they are executed at all, right?
That's right.
I know that if there's no action, then { $$ = $1; } is provided by
default. Clearly, that can never be the final step after a defined
action, as it would override the action or conceal the programmer's
failure to define a value for $$. But I have the impression that $$ is
sometimes initialized at start-of-action, depending on the skeleton.
So, I don't depend on it. :-)
--jkl
