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SubjectRe: [PATCH 1/3] Add missing calls to Py_DECREF
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Hi Joseph,

(Adding Jiri Olsa to CC list as he's maintaining the tooling part as of
now..)

2014-06-04 (수), 14:07 +0200, Joseph Schuchart:
> Add missing calls to Py_DECREF.
>
> The function PyObject_CallObject() returns a new PyObject reference
> on which Py_DECREF has to be called to avoid memory leaks.
> This patch adds these calls where necessary.
>
> It also marks handler_call_die() as NORETURN to make this clear and to
> avoid unnecessary else statements. Note that the abort() is necessary
> since Py_FatalError() does not return but seems to be missing the
> __noretun__ attribute in Python versions <=2.7

Acked-by: Namhyung Kim <namhyung@kernel.org>

Just nitpicks below..

> ---
> tools/perf/util/scripting-engines/trace-event-python.c | 12 ++++++++++--
> 1 file changed, 10 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/util/scripting-engines/trace-event-python.c b/tools/perf/util/scripting-engines/trace-event-python.c
> index cd9774d..8454dc9 100644
> --- a/tools/perf/util/scripting-engines/trace-event-python.c
> +++ b/tools/perf/util/scripting-engines/trace-event-python.c
> @@ -50,10 +50,14 @@ static int zero_flag_atom;
>
> static PyObject *main_module, *main_dict;
>
> +static void handler_call_die(const char *handler_name) NORETURN;

Why is this extra decl line needed? What about just adding the NORETURN
marker to the function definition?


> static void handler_call_die(const char *handler_name)
> {
> PyErr_Print();
> Py_FatalError("problem in Python trace event handler");
> + // Py_FatalError does not return
> + // but we have to make the compiler happy

Please use C-style /* ... */ comments.

Thanks,
Namhyung


> + abort();
> }
>
> /*
> @@ -97,6 +101,7 @@ static void define_value(enum print_arg_type field_type,
> retval = PyObject_CallObject(handler, t);
> if (retval == NULL)
> handler_call_die(handler_name);
> + Py_DECREF(retval);
> }
>
> Py_DECREF(t);
> @@ -143,6 +148,7 @@ static void define_field(enum print_arg_type field_type,
> retval = PyObject_CallObject(handler, t);
> if (retval == NULL)
> handler_call_die(handler_name);
> + Py_DECREF(retval);
> }
>
> Py_DECREF(t);
> @@ -333,6 +339,7 @@ static void python_process_tracepoint(struct perf_sample *sample,
> retval = PyObject_CallObject(handler, t);
> if (retval == NULL)
> handler_call_die(handler_name);
> + Py_DECREF(retval);
> } else {
> handler = PyDict_GetItemString(main_dict, "trace_unhandled");
> if (handler && PyCallable_Check(handler)) {
> @@ -340,6 +347,7 @@ static void python_process_tracepoint(struct perf_sample *sample,
> retval = PyObject_CallObject(handler, t);
> if (retval == NULL)
> handler_call_die("trace_unhandled");
> + Py_DECREF(retval);
> }
> Py_DECREF(dict);
> }
> @@ -399,6 +407,7 @@ static void python_process_general_event(struct perf_sample *sample,
> retval = PyObject_CallObject(handler, t);
> if (retval == NULL)
> handler_call_die(handler_name);
> + Py_DECREF(retval);
> exit:
> Py_DECREF(dict);
> Py_DECREF(t);
> @@ -520,8 +529,7 @@ static int python_stop_script(void)
> retval = PyObject_CallObject(handler, NULL);
> if (retval == NULL)
> handler_call_die("trace_end");
> - else
> - Py_DECREF(retval);
> + Py_DECREF(retval);
> out:
> Py_XDECREF(main_dict);
> Py_XDECREF(main_module);



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