Hi All,
I'm still busy compiling ActionScript 3.0, which, among
others, supports forward function calls:
function bar() {
foo("", 3)
}
function foo(s:String, i:int) {
}
In order to properly resolve these (and check for correct
arguments), I can currently think about three options:
(1) Build an AST, walk that AST two times
(2) Do two LALR passes (i.e. store the flex tokens in memory,
and run bison over them twice)
(3) back-patch (which I don't want to do)
I guess that (2) will use up less memory than (1), and also
will be easier to implement.
Still, what are the best practices for AST building or two-pass
compile, if I
(1) (for the AST:)
Don't want to spell out every single AST node class explicitly, but
rather, if possible, derive these from the grammar?
(2) (for two-pass:)
Don't want to surround every single rule with an if like this:
E = E '+' E {
if(global.pass==1) {
// do nothing in first pass
} else {
code_append(OP_ADD);
}
}
Any pointers to best-practices, existing mailing-list threads etc. are
very welcome.
Thanks,
Matthias
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