[PATCH] Make gdb.selected_thread().inferior return a new reference

[Simon Marchi]

Thanks!  I pushed the patch with the following changes:

On 2017-10-28 14:14, Maksim Dzabraev wrote:
> thpy_get_inferior function should return a new reference to the
> existing inferior object, and therefore should increment its refcount.
> 
> Fixed bug lokks like this.

lokks -> looks

> If multiple time call gdb.selected_thread ().inferior, gdb throws 
> exception:
> (gdb) pi gdb.selected_thread().inferior
> <gdb.Inferior object at 0x7f1952bea698>
> (gdb) pi gdb.selected_thread().inferior
> Python Exception <type 'exceptions.AttributeError'> 'NoneType' object
> has no attribute 'inferior':
> Error while executing Python code.
> (gdb) info threads
>   Id   Target Id         Frame
> * 1    Thread 0x7f54f0474740 (LWP 584) "mc" 0x00007f54ef055c33 in
> ---
>  gdb/ChangeLog                             | 6 ++++++
>  gdb/python/py-infthread.c                 | 1 +
>  gdb/testsuite/ChangeLog                   | 6 ++++++
>  gdb/testsuite/gdb.python/py-infthread.exp | 9 +++++++++
>  4 files changed, 22 insertions(+)
> 
> diff --git a/gdb/ChangeLog b/gdb/ChangeLog
> index 9fe632985e..4583a78fe5 100644
> --- a/gdb/ChangeLog
> +++ b/gdb/ChangeLog
> @@ -1,3 +1,9 @@
> +2017-10-28  Maksim Dzabraev  <dzabraew@gmail.com>
> +
> +	PR python/21213
> +	* python/py-infthread.c (thpy_get_inferior): Increment reference
> +	of inferior before returning it.
> +
>  2017-10-27  Simon Marchi  <simon.marchi@ericsson.com>
> 
>  	* unittests/common-utils-selftests.c (format): Add
> diff --git a/gdb/python/py-infthread.c b/gdb/python/py-infthread.c
> index 626c15cedb..31d576f7c7 100644
> --- a/gdb/python/py-infthread.c
> +++ b/gdb/python/py-infthread.c
> @@ -162,6 +162,7 @@ thpy_get_inferior (PyObject *self, void *ignore)
>    thread_object *thread_obj = (thread_object *) self;
> 
>    THPY_REQUIRE_VALID (thread_obj);
> +  Py_INCREF (thread_obj->inf_obj);
> 
>    return thread_obj->inf_obj;
>  }
> diff --git a/gdb/testsuite/ChangeLog b/gdb/testsuite/ChangeLog
> index 0254a28550..72334fd3e2 100644
> --- a/gdb/testsuite/ChangeLog
> +++ b/gdb/testsuite/ChangeLog
> @@ -1,3 +1,9 @@
> +2017-10-28 Maksim Dzabraev <dzabraew@gmail.com>

Used two spaces between fields.

Simon