gnupic: some question about the directive GLOBAL in the source code.
Subject:
Re: some question about the directive GLOBAL in the source code.
From:
feqin fan ####@####.####
Date:
18 Aug 2012 01:15:32 -0000
Message-Id: <CAOfAq_pR5kNQkbG6dWG3XD8BwLFY=KzUm5Q=xcPk3RHRjh=g9g@mail.gmail.com>
(⊙o⊙)…
Thank you.
Can you tell me why so many struct file_context and struct source_context?
struct file_context and struct source_context do what..??
THX..
2012/8/18 Marko Kohtala ####@####.####
> I think you are missing the read of gperror. It wont print the error on
> first pass, and on second pass the symbol is already defined.
>
> Marko
>
> 2012/8/14 feqin fan ####@####.####
>
> > Hello, everybody, I'm sorry to trouble you again.
> > I have read most of the source code of gputils. I have a query about
> > the implementation of the directive GLOBAL.
> > for example, Have this code:
> >
> > global var
> >
> > udata
> > var res 1
> >
> > the assembler deal with the first line "global var",
> > the calling sequence is like this : yyparse() - do_or_append_insn(char *,
> > struct pnode *) - do_insn(char *, struct pnode *) - do_global()
> > the function do_global() source code :
> >
> > 1, if (state.mode == absolute) {
> > 2, gperror(GPE_OBJECT_ONLY, NULL);
> > 3, } else {
> > 4, for (; parms; parms = TAIL(parms)) {
> > 5, p = maybe_evaluate_concat(HEAD(parms)); //p will point
> to
> > "var".
> > 6, if (p) {
> > 7, s = get_symbol(state.stTop, p); //s will be NULL
> > 8, if (s == NULL) {
> > 9, snprintf(buf,
> > 10, sizeof(buf),
> > 11 "Symbol not previously defined (%s).",
> > 12, p);
> > 13, gperror(GPE_NOSYM, buf);
> >
> >
> >
> > the line 4 must be first executed, in line 5 the p will point to "var".
> and
> > in line 7, because the source code "global var" is the first line of the
> > being assembled code.
> > So. in the function do_global() line 7, the s will be NULL,so the error
> > will be print..
> >
> > Please tell what's wring in my analyses..??
> > :-)
> >
> > THX, Guys..
> >
>
