Re: [RFC] Python Finish Breakpoints

[Phil Muldoon <pmuldoon at redhat dot com>]

Kevin Pouget <kevin.pouget@gmail.com> writes:

I have some comments regarding the Python bits.
>  
> +  ** A new class "gdb.FinishBreakpoint" is provided to catch the return
> +     of a function.  This class is based on the "finish" command
> +     available in the CLI. 
> +
>    ** Type objects for struct and union types now allow access to
>       the fields using standard Python dictionary (mapping) methods.
>       For example, "some_type['myfield']" now works, as does
> diff --git a/gdb/breakpoint.c b/gdb/breakpoint.c
> index ba1b08f..ffd2ef6 100644
> --- a/gdb/breakpoint.c
> +++ b/gdb/breakpoint.c
> @@ -5700,6 +5700,7 @@ init_raw_breakpoint_without_location (struct breakpoint *b,
>    b->frame_id = null_frame_id;
>    b->condition_not_parsed = 0;
>    b->py_bp_object = NULL;
> +  b->is_py_finish_bp = 0;

Is there any reason why this need to be in the breakpoint struct? I
think this should be encapsulated in breakpoint PyObject, and a accessor
method provided for it.  As a finish breakpoint can only ever be
instantiated by Python, there will always be a py_bp_object attached to
make the call.

> +/* struct implementing the gdb.FinishBreakpoint object by extending
> +   the gdb.Breakpoint class.  */
> +struct finish_breakpoint_object
> +{
> +  /* gdb.Breakpoint base class.  */
> +  struct breakpoint_object py_bp;
> +  /* gdb.Type object of the function finished by this breakpoint.  */
> +  PyObject *function_type;
> +  /* gdb.Type object of the value return by the breakpointed function.  */
> +  PyObject *return_type;
> +  /* When stopped at this FinishBreakpoint, value returned by the function;
> +     Py_None if the value is not computable;
> +     NULL if GDB is not stopped at a FinishBreakpoint.  */
> +  PyObject *return_value;
> +};

I think these comments should wrap? They wrap for me in emacs.  

Cheers

Phil