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Re: [RFC] Display exact entered expression for watchpoints
- From: Duncan Roe <duncanr at optimation dot com dot au>
- To: gdb-patches at sources dot redhat dot com
- Date: Fri, 15 Nov 2002 12:58:36 +1100
- Subject: Re: [RFC] Display exact entered expression for watchpoints
- >received: from pinot.mel.optimation.com.au by optimation.com.au (5.0/OSE-3.1)for gdb-patches@sources.redhat.com id AA23274; Fri, 15 Nov 2002 12:58:36 +1100
- References: <5.0.2.1.2.20021114112441.032c9fb0@ics.u-strasbg.fr>
Hi Pierre,
I like the "0x" variant better also.
Just a BTW, but in the circumstances you describe, I would do:
watch *(struct ui_file **) 0x823b5cc
so that gdb knows how many bytes to watch.
E.g.:
Hardware watchpoint 2: *(double *) 3221223348
Old value = 3.2999999999999994
New value = 3.2999999999999998
i.e. a 1-bit change in the 8th byte (0x400a666666666665 -> 0x400a666666666666)
Cheers ... Duncan.
On Thu, Nov 14, 2002 at 12:00:18PM +0100, Pierre Muller wrote:
> When I watch a memory location,
> I almost always use hexadecimal notation.
>
> For instance lets say that I want to watch
> the memory containing the value of gdb_stderr
> On my linux box
> (top-gdb)p &gdb_stderr
> returns
> $1 = (struct ui_file **) 0x823b5cc
> (ok, here I could simply use 'watch gdb_stderr,
> but in some other cases like dynamically allocated memory I can't).
> if I enter
> (top-gdb) watch *0x823b5cc
> Hardware watchpoint 3: *136558028
> (top-gdb) inf b
> Num Type Disp Enb Address What
> 1 breakpoint keep y 0x080f0d79 in internal_error
> at ../../src/origdb/utils.c:810
> 2 breakpoint keep y 0x080783eb in info_command
> at ../../src/origdb/cli/cli-cmds.c:202
> silent
> return
> 3 hw watchpoint keep y *136558028
> (top-gdb)
>
>
> After my patch, I get
> (top-gdb) watch *0x823b5cc
> Hardware watchpoint 3: *0x823b5cc
> (top-gdb) inf b
> Num Type Disp Enb Address What
> 1 breakpoint keep y 0x080f0d79 in internal_error
> at ../../src/origdb/utils.c:810
> 2 breakpoint keep y 0x080783eb in info_command
> at ../../src/origdb/cli/cli-cmds.c:202
> silent
> return
> 3 hw watchpoint keep y *0x823b5cc
>