Re: parse_expression

On 5/28/07, Axel Dörfler <[email protected]> wrote:
> Ingo Weinhold <bonefish-CFLBMwTPW48UNGrzBIF7/[email protected]> wrote:
> > > But if you had put [%eip = 0x12345] at the command line, the
> > > debugger
> > > would have called parse_expression() directly.
> > So what you're saying is, if the input line starts with "[" the
> > debugger
> > evaluates the whole line as an expression, otherwise it must start
> > with a
> > command name and the command parses it's arguments as needed, right?
>
> That should more or less be it; even though I wouldn't mind if the '['
> is optional, and only necessary when the expression would be ambiguous.
>
> > BTW, I think, the "[...]" blocks have to be scanned by the debugger
> > at any
> > rate, so that e.g. "db [lastAddress + 10] 20" passes just two
> > arguments to
> > the db command ("[lastAddress + 10]" and "20").
>
> That would at least be helpful, indeed - it could be done in the same
> way as for quotes, I think.
>
> > I suppose it would be powered by architecture specific functions
> > like:
> >
> >       bool arch_set_iframe_register(struct thread* thread, int
> > iframeNumber,
> >               const char* registerName, int64 value);
> >       bool arch_get_iframe_register(struct thread* thread, int
> > iframeNumber,
> >               const char* registerName, int64* value);
> >
> > The bool result may as well be a status_t, though the only error I
> > can
> > imagine at the moment is that the register name is invalid,
> > respectively
> > the register not included in the iframe.

Sorry, a little slow to get back -- long weekend.  ;)  At any rate,
that all sounds good.  I will probably try and get started this
weekend, so I will probably have some questions then.

Morgan

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