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小刚

2013-Jul-16 02:00 UTC

[LLVMdev] make lldb work

Sorry if asked before.

I'm new to LLDB, try to use it according to the lldb project site. I write
some very simple code like:

#include <stdio.h>

int main(int argc, char **argv)
{
    int counter = 0;
    while ( counter < 10 )
        counter++;

    printf("counter: %d\n", counter);

    return 0;
}

and the session like:

$ clang -g main.c
$ lldb-3.4 a.out
(lldb) breakpoint set -l 8
......
(lldb) breakpoint set -l 12
......
(lldb) breakpoint list
......
(lldb) process launch
Process 1105 launched: '/home/maple/debug/arena/a.out' (i386)
counter: 10
Process 1105 exited with status = 0 (0x00000000)

I checked with gdb, it works well. I'm not sure whether it's a bug or my
false command.

I'm using Ubuntu 12.04, and the lldb is from llvm.org/apt. It's
svn186357.

——
美丽有两种：
一是深刻又动人的方程，
一是你泛着倦意淡淡的笑容。
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Malea, Daniel

2013-Jul-16 18:04 UTC

head link

[LLVMdev] make lldb work

Hi,

I notice you're running a 32-bit program; are you also on a 32-bit host, or
do you have a 64-bit OS installed? We don't generally test on 32-bit hosts,
so it's possible you found a new bug. In addition, there are some known bugs
with debugging 32-bit programs (even on 64-bit hosts) which will we hopefully be
resolving soon.

Nonetheless, I was unable to reproduce the behaviour you reported (with lldb-3.4
Ubuntu package version r186406). What's the output of "breakpoint
list" -- does LLDB resolve any address for the breakpoint?

Here is my LLDB session on a 64-bit host debugging a 32-bit program:

daniel at lautrec:~$ lldb ./a.out
Current executable set to './a.out' (i386).
(lldb) breakpoint set -l 8
Breakpoint 1: where = a.out`main + 67 at bla.cpp:9, address = 0x080484f3
(lldb) breakpoint set -l 12
Breakpoint 2: no locations (pending).
WARNING:  Unable to resolve breakpoint to any actual locations.
(lldb) breakpoint list
Current breakpoints:
1: file = '/home/daniel/bla.cpp', line = 8, locations = 1
  1.1: where = a.out`main + 67 at bla.cpp:9, address = 0x080484f3, unresolved,
hit count = 0

2: file = '/home/daniel/bla.cpp', line = 12, locations = 0 (pending)

(lldb) process launch
Process 22954 launched: './a.out' (i386)
Process 22954 stopped
* thread #1: tid = 0x59aa, 0x080484f3 a.out`main(argc=1, argv=0xffa37624) + 67
at bla.cpp:9, name = 'a.out, stop reason = breakpoint 1.1
    frame #0: 0x080484f3 a.out`main(argc=1, argv=0xffa37624) + 67 at bla.cpp:9
   6      while ( counter < 10 )
   7          counter++;
   8
-> 9      printf("counter: %d\n", counter);
   10
   11      return 0;
   12   }
(lldb)




From: 小刚 <maple.hl at gmail.com<mailto:maple.hl at gmail.com>>
Reply-To: "Maple.HL at gmail.com<mailto:Maple.HL at gmail.com>"
<Maple.HL at gmail.com<mailto:Maple.HL at gmail.com>>
Date: Monday, 15 July, 2013 10:00 PM
To: LLVM List <llvmdev at cs.uiuc.edu<mailto:llvmdev at
cs.uiuc.edu>>
Subject: [LLVMdev] make lldb work

Sorry if asked before.

I'm new to LLDB, try to use it according to the lldb project site. I write
some very simple code like:

#include <stdio.h>

int main(int argc, char **argv)
{
    int counter = 0;
    while ( counter < 10 )
        counter++;

    printf("counter: %d\n", counter);

    return 0;
}

and the session like:

$ clang -g main.c
$ lldb-3.4 a.out
(lldb) breakpoint set -l 8
......
(lldb) breakpoint set -l 12
......
(lldb) breakpoint list
......
(lldb) process launch
Process 1105 launched: '/home/maple/debug/arena/a.out' (i386)
counter: 10
Process 1105 exited with status = 0 (0x00000000)

I checked with gdb, it works well. I'm not sure whether it's a bug or my
false command.

I'm using Ubuntu 12.04, and the lldb is from
llvm.org/apt<http://llvm.org/apt>. It's svn186357.

——
美丽有两种：
一是深刻又动人的方程，
一是你泛着倦意淡淡的笑容。

小刚

2013-Jul-17 01:29 UTC

head link

[LLVMdev] make lldb work

The host is a 32-bit box, and the debug program is 32-bit as well. The
`breakpoint list`  command works well. Actually, I've compiled lldb from
source, which doesn't change the situation. So this is very possible a
32-bit bug.

I think I should find a 64-bit Linux box, and try again. And I may also try
to locate the problem, which will take some time, since I'm new to this.

――
美丽有两种：
一是深刻又动人的方程，
一是你泛着倦意淡淡的笑容。


On Wed, Jul 17, 2013 at 2:04 AM, Malea, Daniel <daniel.malea at
intel.com>wrote:
>  Hi,
>
>  I notice you're running a 32-bit program; are you also on a 32-bit
host,
> or do you have a 64-bit OS installed? We don't generally test on 32-bit
> hosts, so it's possible you found a new bug. In addition, there are
some
> known bugs with debugging 32-bit programs (even on 64-bit hosts) which will
> we hopefully be resolving soon.
>
>  Nonetheless, I was unable to reproduce the behaviour you reported (with
> lldb-3.4 Ubuntu package version r186406). What's the output of
"breakpoint
> list" -- does LLDB resolve any address for the breakpoint?
>
>  Here is my LLDB session on a 64-bit host debugging a 32-bit program:
>
>  daniel at lautrec:~$ lldb ./a.out
> Current executable set to './a.out' (i386).
> (lldb) breakpoint set -l 8
> Breakpoint 1: where = a.out`main + 67 at bla.cpp:9, address = 0x080484f3
> (lldb) breakpoint set -l 12
> Breakpoint 2: no locations (pending).
> WARNING:  Unable to resolve breakpoint to any actual locations.
> (lldb) breakpoint list
> Current breakpoints:
> 1: file = '/home/daniel/bla.cpp', line = 8, locations = 1
>   1.1: where = a.out`main + 67 at bla.cpp:9, address = 0x080484f3,
> unresolved, hit count = 0
>
>  2: file = '/home/daniel/bla.cpp', line = 12, locations = 0
(pending)
>
>  (lldb) process launch
> Process 22954 launched: './a.out' (i386)
> Process 22954 stopped
> * thread #1: tid = 0x59aa, 0x080484f3 a.out`main(argc=1, argv=0xffa37624)
> + 67 at bla.cpp:9, name = 'a.out, stop reason = breakpoint 1.1
>     frame #0: 0x080484f3 a.out`main(argc=1, argv=0xffa37624) + 67 at
> bla.cpp:9
>    6      while ( counter < 10 )
>    7          counter++;
>    8
> -> 9      printf("counter: %d\n", counter);
>    10
>    11      return 0;
>    12   }
> (lldb)
>
>
>
>
>   From: 小刚 <maple.hl at gmail.com>
> Reply-To: "Maple.HL at gmail.com" <Maple.HL at gmail.com>
> Date: Monday, 15 July, 2013 10:00 PM
> To: LLVM List <llvmdev at cs.uiuc.edu>
> Subject: [LLVMdev] make lldb work
>
>   Sorry if asked before.
>
>  I'm new to LLDB, try to use it according to the lldb project site. I
> write some very simple code like:
>
>  #include <stdio.h>
>
>  int main(int argc, char **argv)
> {
>     int counter = 0;
>     while ( counter < 10 )
>         counter++;
>
>      printf("counter: %d\n", counter);
>
>      return 0;
> }
>
>  and the session like:
>
>  $ clang -g main.c
> $ lldb-3.4 a.out
> (lldb) breakpoint set -l 8
> ......
> (lldb) breakpoint set -l 12
> ......
> (lldb) breakpoint list
> ......
> (lldb) process launch
>  Process 1105 launched: '/home/maple/debug/arena/a.out' (i386)
> counter: 10
> Process 1105 exited with status = 0 (0x00000000)
>
>  I checked with gdb, it works well. I'm not sure whether it's a bug
or my
> false command.
>
>  I'm using Ubuntu 12.04, and the lldb is from llvm.org/apt. It's
> svn186357.
>
>   ――
> 美丽有两种：
> 一是深刻又动人的方程，
> 一是你泛着倦意淡淡的笑容。
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