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Re: -var-update and address changes
- From: Vladimir Prus <ghost at cs dot msu dot su>
- To: Daniel Jacobowitz <drow at false dot org>
- Cc: Jim Ingham <jingham at apple dot com>, Nick Roberts <nickrob at snap dot net dot nz>, gdb at sources dot redhat dot com
- Date: Thu, 4 May 2006 19:11:46 +0400
- Subject: Re: -var-update and address changes
- References: <e1iqcl$2k4$1@sea.gmane.org> <200605031002.21910.ghost@cs.msu.su> <20060504145046.GA32605@nevyn.them.org>
On Thursday 04 May 2006 18:50, Daniel Jacobowitz wrote:
> On Wed, May 03, 2006 at 10:02:21AM +0400, Vladimir Prus wrote:
> > On Tuesday 02 May 2006 21:22, Jim Ingham wrote:
> > > Shouldn't the call to var->root->lang->value_of_root down at the
> > > bottom of value_of_root take care of fetching the new value?
> >
> > Well, it fetches the new value, I believe.
>
> For the wrong frame.
>
> I've only lightly tested this; could you give it a try? If it works, I
> think we should really get the "@" syntax added to the manual and
> testsuite.
This appears to work for a simple case of variable 'i' defined both in 'main'
and in 'foo' called from main.
For the case where I'm stepping into 'bar' that has no 'i', -var-update
correctly says that 'i' has gone out of scope. However, after -exec-finish,
-var-update does not say that 'i' is not back in scope -- which would be nice
if "@-varobjs" are to be used for watches.
Here's example I've used for testing:
include <stdio.h>
int foo()
{
int i = 15;
printf("foo\n");
}
int bar()
{
}
int main()
{
int i = 5;
printf("hi 1\n");
foo();
bar();
}
and example session:
b 19
&"b 19\n"
~"Breakpoint 1 at 0x804849e: file s.cpp, line 19.\n"
^done
(gdb)
r
&"r\n"
~"Starting program: /space/p2/ghost/build/mi-tests/a.out \n"
hi 1
foo
~"\n"
~"Breakpoint 1, main () at s.cpp:19\n"
~"19\t bar();\n"
^done
(gdb)
-var-create I @ i
^done,name="I",numchild="0",type="int"
(gdb)
-exec-step
^running
(gdb)
*stopped,reason="end-stepping-range",thread-id="0",frame={addr="0x08048473",func="bar",args=[],file="s.cpp",fullname="/space/p2/ghost/build/mi-tests/s.cpp",line="12"}
(gdb)
-var-update *
^done,changelist=[{name="I",in_scope="false"}]
(gdb)
-exec-finish
^running
(gdb)
*stopped,reason="function-finished",thread-id="0",frame={addr="0x080484a3",func="main",args=[],file="s.cpp",fullname="/space/p2/ghost/build/mi-tests/s.cpp",line="20"},gdb-result-var="$1",return-value="4"
(gdb)
-var-update *
^done,changelist=[]
(gdb)
p i
&"p i\n"
~"$2 = 5"
~"\n"
^done
(gdb)
- Volodya