Re: [PATCH] fix PR 15180 "May only run agent-printf on the target"

[Hui Zhu <teawater at gmail dot com>]

On Mon, Jul 1, 2013 at 10:29 PM, Pedro Alves <palves@redhat.com> wrote:
> On 07/01/2013 09:51 AM, Hui Zhu wrote:
>> On Mon, Jul 1, 2013 at 4:10 PM, Pedro Alves <palves@redhat.com> wrote:
>>> On 06/30/2013 04:17 PM, Hui Zhu wrote:
>>>>>> If dprintf style is agent, then the target doesn't report events
>>>>>> for such hits.  If we happen to see a trap reported for the
>>>>>> same address as another breakpoint, the trap is surely not explained
>>>>>> by the dprintf.  IOW, we shouldn't have a bpstat a dprintf w/ style
>>>>>> agent at all.  What is need is to override the breakpoint_hit method
>>>>>> of dprintf_breakpoint_ops to always return false for agent style dprintfs.
>>>>>>
>>>>>> Or maybe I'm missing something.  I have a hard time going from
>>>>>> the bug description in the PR to the patch.
>>>> OK.  I add dprintf_check_status in the new patch according to your comments.
>>>>
>>>
>>> But I suggested the breakpoint_ops->breakpoint_hit not breakpoint_ops->check_status.
>>> An agent-style dprintf is just like a tracepoint.  It can't ever explain
>>> a stop.  See tracepoint_breakpoint_hit.  If it didn't work, please explain why.
>>
>> OK.  Post a new version according to your comments.
>> Please help me review it.
>
> So I've now picked the patches from
> <http://sourceware.org/ml/gdb-patches/2013-06/msg00367.html>

Oops, I so sorry that dprintf-remote-cond-server.txt in that url is
not the right version.  Could you help me try the new version in
http://sourceware.org/ml/gdb-patches/2013-07/msg00038.html

Thanks,
Hui

>
> and then applied these new dprint-same-addr patches on top.
>
> They completely break gdbserver.  :-/  First I tried:
>
>  $ make check RUNTESTFLAGS="--target_board=native-gdbserver dprintf-same-addr.exp"
>  ...
>  Running target native-gdbserver
>  Using ../../../src/gdb/testsuite/boards/../boards/native-gdbserver.exp as board description file for target.
>  Using ../../../src/gdb/testsuite/config/gdbserver.exp as tool-and-target-specific interface file.
>  Running ../../../src/gdb/testsuite/gdb.base/dprintf-same-addr.exp ...
>
>                  === gdb Summary ===
>
>  /home/pedro/gdb/mygit/build/gdb/testsuite/../../gdb/gdb version  7.6.50.20130701-cvs -nw -nx -data-directory /home/pedro/gdb/mygit/build/gdb/testsuite/../data-directory
>
>  make[1]: Leaving directory `/home/pedro/gdb/mygit/build/gdb/testsuite'
>  $
>
> No FAILs/PASSes/UNSUPPORTED/etc., no nothing, is odd.  Turns out
> that the program isn't even stopping at main.  That should have
> resulted in a FAIL.  (Please fix that.)
>
> Trying some other existing test shows:
>
>  Running target native-gdbserver
>  Using ../../../src/gdb/testsuite/boards/../boards/native-gdbserver.exp as board description file for target.
>  Using ../../../src/gdb/testsuite/config/gdbserver.exp as tool-and-target-specific interface file.
>  Running ../../../src/gdb/testsuite/gdb.base/break.exp ...
>  FAIL: gdb.base/break.exp: run until function breakpoint
>  FAIL: gdb.base/break.exp: run until breakpoint set at a line number (the program is no longer running)
>  FAIL: gdb.base/break.exp: run until file:function(6) breakpoint (the program is no longer running)
>  FAIL: gdb.base/break.exp: run until file:function(5) breakpoint (the program is no longer running)
>  FAIL: gdb.base/break.exp: run until file:function(4) breakpoint (the program is no longer running)
>  FAIL: gdb.base/break.exp: run until file:function(3) breakpoint (the program is no longer running)
>  FAIL: gdb.base/break.exp: run until file:function(2) breakpoint (the program is no longer running)
>  FAIL: gdb.base/break.exp: run until file:function(1) breakpoint (the program is no longer running)
>  FAIL: gdb.base/break.exp: run until quoted breakpoint (the program is no longer running)
>
> ...
>
> I didn't bother to run the whole testsuite.
>
> At least with native testing I got:
>
> $ make check RUNTESTFLAGS="dprintf-same-addr.exp"
> ...
> # of expected passes            29
> # of unsupported tests          1
> ...
>
> --
> Pedro Alves
>