On Mon, 26 Feb 2018 10:45:32 +0900
Namhyung Kim <namhyung@xxxxxxxxxx> wrote:
> On Sat, Feb 24, 2018 at 02:35:40PM +0900, Masami Hiramatsu wrote:
> > Add array type support for probe events.
> > This allows user to get arraied types from memory address.
> > The array type syntax is
> >
> > TYPE[N]
> >
> > Where TYPE is one of types (u8/16/32/64,s8/16/32/64,
> > x8/16/32/64, symbol, string) and N is a fixed value less
> > than 64.
> >
> > The string array type is a bit different from other types. For
> > other base types, <base-type>[1] is equal to <base-type>
> > (e.g. +0(%di):x32[1] is same as +0(%di):x32.) But string[1] is not
> > equal to string. The string type itself represents "char array",
> > but string array type represents "char * array". So, for example,
> > +0(%di):string[1] is equal to +0(+0(%di)):string.
> >
> > Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
> > ---
> > Changes in v2:
> > - Add array description in README file
> > - Fix to init s3 code out of loop.
> > - Fix to proceed code when the last code is OP_ARRAY.
> > - Add string array type and bitfield array type.
> > ---
>
> [SNIP]
> > @@ -546,11 +610,16 @@ int traceprobe_define_arg_fields(struct trace_event_call *event_call,
> > /* Set argument names as fields */
> > for (i = 0; i < tp->nr_args; i++) {
> > struct probe_arg *parg = &tp->args[i];
> > -
> > - ret = trace_define_field(event_call, parg->type->fmttype,
> > - parg->name,
> > + const char *fmt = parg->type->fmttype;
> > + int size = parg->type->size;
> > +
> > + if (parg->fmt)
> > + fmt = parg->fmt;
> > + if (parg->count)
> > + size *= parg->count;
> > + ret = trace_define_field(event_call, fmt, parg->name,
> > offset + parg->offset,
> > - parg->type->size,
> > + parg->type->size * parg->count,
>
> It should use the 'size' variable, otherwise scalar types will have 0 size.
Oops, good catch! I forgot to use it at the main point...
Thank you so much!
>
> Thanks,
> Namhyung
>
>
> > parg->type->is_signed,
> > FILTER_OTHER);
--
Masami Hiramatsu <mhiramat@xxxxxxxxxx>
--
To unsubscribe from this list: send the line "unsubscribe linux-trace-users" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
|