Arguments of inlines

Arguments of inlines

[David J. Wilder]

I am probing the following inline defined in include/rdma/ib_verbs.h:

static inline int ib_post_send(struct ib_qp *qp,
                               struct ib_send_wr *send_wr,
                               struct ib_send_wr **bad_send_wr)
{
        return qp->device->post_send(qp, send_wr, bad_send_wr);
}

And accessing the qp argument, however stap complains it can not
reference $qp.  It this a limitation? Any ideas?

My probe:

probe module("ib_ipoib").function("ib_post_send").inline
{
        printf("ib_post_send: ib_qpv = %p  \n",$qp);
}


Pass 1: parsed user script and 45 library script(s) in
390usr/0sys/405real ms.
probe ib_post_send@include/rdma/ib_verbs.h:1345 module=ib_ipoib
reloc=.text section=.text pc=0x2591b48
probe ib_post_send@include/rdma/ib_verbs.h:1345 module=ib_ipoib
reloc=.text section=.text pc=0x2593400
probe ib_post_send@include/rdma/ib_verbs.h:1345 module=ib_ipoib
reloc=.text section=.text pc=0x2593844
probe ib_post_send@include/rdma/ib_verbs.h:1345 module=ib_ipoib
reloc=.text section=.text pc=0x2597264
probe ib_post_send@include/rdma/ib_verbs.h:1345 module=ib_ipoib
reloc=.text section=.text pc=0x2598b08
semantic error: not accessible at this address: identifier '$qp' at
rdma.stp:6:4

$ rpm -qa | grep systemtap
systemtap-0.7.2-2.el5
systemtap-runtime-0.7.2-2.el5

$ stap -V
SystemTap translator/driver (version 0.7.2/0.137 non-git sources)
Copyright (C) 2005-2008 Red Hat, Inc. and others
This is free software; see the source for copying conditions.


Thanks
   Dave

Re: Arguments of inlines

[Roland McGrath]

It might be handy for some level of verbosity to give
debugfilename+dwarf_dieoffset (hex) of the variable/formal_parameter
in question for those errors.  That makes something easy to search for
in eu-readelf --debug-dump=info output and quickly verify what the
compiler gave us for double-checking/bug-reporting.

Thanks,
Roland

Re: Arguments of inlines

[Masami Hiramatsu]

Hi,

David J. Wilder wrote:
> I am probing the following inline defined in include/rdma/ib_verbs.h:
> 
> static inline int ib_post_send(struct ib_qp *qp,
>                                struct ib_send_wr *send_wr,
>                                struct ib_send_wr **bad_send_wr)
> {
>         return qp->device->post_send(qp, send_wr, bad_send_wr);
> }
> 
> And accessing the qp argument, however stap complains it can not
> reference $qp.  It this a limitation? Any ideas?

I think this has been filed in bz1155
http://sources.redhat.com/bugzilla/show_bug.cgi?id=1155

Thanks,

-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America) Inc.
Software Solutions Division

e-mail: mhiramat@redhat.com