Re: MI: reporting of multiple breakpoints

[Vladimir Prus <ghost@cs.msu.su>]

Daniel Jacobowitz wrote:

> On Fri, Feb 17, 2006 at 06:01:13PM +0300, Vladimir Prus wrote:
>> 
>> Hello!
>> It seems that for stop on multiple breakpoints, MI reports only one:
>> 
>>     (gdb)
>>     -break-insert main
>>     ^done,bkpt={number="1",type="breakpoint".....
>>     (gdb)
>>     -break-insert main
>>     ^done,bkpt={number="2",type="breakpoint"......
>>     (gdb)
>>     -exec-run
>>     ^running
>>     (gdb)
>>    *stopped,reason="breakpoint-hit",bkptno="1",thread-id="1",frame={...}
>> 
>> Is this a bug, or by design?
> 
> The CLI does the same thing; so does the core of GDB, unsurprisingly.

For ordinary breakpoints, yes. For watchpoints, not quite:

    (gdb) watch p1
    Hardware watchpoint 3: p1
    (gdb) watch p1
    Hardware watchpoint 4: p1
    (gdb) c
    Continuing.
    Hardware watchpoint 3: p1
    
    Old value = (int *) 0x0
    New value = (int *) 0x8049994
    Hardware watchpoint 4: p1
    
    Old value = (int *) 0x0
    New value = (int *) 0x8049994
    main () at print_pointers.cpp:27
    27          B* p2 = (B*)0x12345678;

while in MI we get:

    -break-watch p1
    ^done,wpt={number="2",exp="p1"}
    (gdb)
    -break-watch p2
    ^done,wpt={number="3",exp="p2"}
    (gdb)
    -exec-continue
    ^running
    (gdb)
    *stopped,reason="watchpoint-trigger",
    wpt={number="2",exp="p1"},
    value={old="(int *) 0x0",new="(int *) 0x8049994"},
    thread-id="1",frame={...}

CLI reports two watchpoints, and MI reports just one. I did not test more
complex combinations, like mix of watchpoints and breakpoints that trigger
on the same line.


> It's not entirely obvious what ought to happen.

Well, all breakpoints which stop conditions are satisfied should be
reported, I guess.

- Volodya