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Use gdbpy_ref in py-cmd.c 

This changes py-cmd.c to use gdbpy_ref in more places.  This also
fixes a latent memory leak in cmdpy_completer_helper, which
unnecessarily increfs the result of PyObject_CallMethodObjArgs.  This
is not needed because that function returns a new reference.

2017-01-10  Tom Tromey  <tom@tromey.com>

	* python/py-cmd.c (cmdpy_completer_helper): Use gdbpy_ref.  Remove
	extra incref.
	(cmdpy_completer_handle_brkchars, cmdpy_completer, cmdpy_init):
	Use gdbpy_ref.
This commit is contained in:
Tom Tromey 2016-11-20 10:23:08 -07:00
parent 64081434cc
commit 905f2ccab1
2 changed files with 37 additions and 51 deletions
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7
gdb/ChangeLog
View File

@ -1,3 +1,10 @@
2017-01-10 Tom Tromey <tom@tromey.com>
* python/py-cmd.c (cmdpy_completer_helper): Use gdbpy_ref. Remove
extra incref.
(cmdpy_completer_handle_brkchars, cmdpy_completer, cmdpy_init):
Use gdbpy_ref.
2017-01-10 Tom Tromey <tom@tromey.com>
* python/py-breakpoint.c (gdbpy_breakpoint_cond_says_stop): Use

81
gdb/python/py-cmd.c
View File

@ -232,8 +232,6 @@ cmdpy_completer_helper (struct cmd_list_element *command,
const char *text, const char *word)
{
cmdpy_object *obj = (cmdpy_object *) get_cmd_context (command);
PyObject *textobj, *wordobj;
PyObject *resultobj;
if (obj == NULL)
error (_("Invalid invocation of Python command object."));
@ -243,29 +241,26 @@ cmdpy_completer_helper (struct cmd_list_element *command,
return NULL;
}
textobj = PyUnicode_Decode (text, strlen (text), host_charset (), NULL);
gdbpy_ref textobj (PyUnicode_Decode (text, strlen (text), host_charset (),
NULL));
if (textobj == NULL)
error (_("Could not convert argument to Python string."));
wordobj = PyUnicode_Decode (word, strlen (word), host_charset (), NULL);
gdbpy_ref wordobj (PyUnicode_Decode (word, strlen (word), host_charset (),
NULL));
if (wordobj == NULL)
{
Py_DECREF (textobj);
error (_("Could not convert argument to Python string."));
}
error (_("Could not convert argument to Python string."));
resultobj = PyObject_CallMethodObjArgs ((PyObject *) obj, complete_cst,
textobj, wordobj, NULL);
Py_DECREF (textobj);
Py_DECREF (wordobj);
if (!resultobj)
gdbpy_ref resultobj (PyObject_CallMethodObjArgs ((PyObject *) obj,
complete_cst,
textobj.get (),
wordobj.get (), NULL));
if (resultobj == NULL)
{
/* Just swallow errors here. */
PyErr_Clear ();
}
Py_XINCREF (resultobj);
return resultobj;
return resultobj.release ();
}
/* Python function called to determine the break characters of a
@ -277,26 +272,24 @@ static void
cmdpy_completer_handle_brkchars (struct cmd_list_element *command,
const char *text, const char *word)
{
PyObject *resultobj = NULL;
gdbpy_enter enter_py (get_current_arch (), current_language);
/* Calling our helper to obtain the PyObject of the Python
function. */
resultobj = cmdpy_completer_helper (command, text, word);
gdbpy_ref resultobj (cmdpy_completer_helper (command, text, word));
/* Check if there was an error. */
if (resultobj == NULL)
goto done;
return;
if (PyInt_Check (resultobj))
if (PyInt_Check (resultobj.get ()))
{
/* User code may also return one of the completion constants,
thus requesting that sort of completion. We are only
interested in this kind of return. */
long value;
if (!gdb_py_int_as_long (resultobj, &value))
if (!gdb_py_int_as_long (resultobj.get (), &value))
{
/* Ignore. */
PyErr_Clear ();
@ -310,10 +303,6 @@ cmdpy_completer_handle_brkchars (struct cmd_list_element *command,
(completers[value].completer);
}
}
done:
Py_XDECREF (resultobj);
}
/* Called by gdb for command completion. */
@ -322,29 +311,28 @@ static VEC (char_ptr) *
cmdpy_completer (struct cmd_list_element *command,
const char *text, const char *word)
{
PyObject *resultobj = NULL;
VEC (char_ptr) *result = NULL;
gdbpy_enter enter_py (get_current_arch (), current_language);
/* Calling our helper to obtain the PyObject of the Python
function. */
resultobj = cmdpy_completer_helper (command, text, word);
gdbpy_ref resultobj (cmdpy_completer_helper (command, text, word));
/* If the result object of calling the Python function is NULL, it
means that there was an error. In this case, just give up and
return NULL. */
if (resultobj == NULL)
goto done;
return NULL;
result = NULL;
if (PyInt_Check (resultobj))
if (PyInt_Check (resultobj.get ()))
{
/* User code may also return one of the completion constants,
thus requesting that sort of completion. */
long value;
if (! gdb_py_int_as_long (resultobj, &value))
if (! gdb_py_int_as_long (resultobj.get (), &value))
{
/* Ignore. */
PyErr_Clear ();
@ -354,24 +342,24 @@ cmdpy_completer (struct cmd_list_element *command,
}
else
{
PyObject *iter = PyObject_GetIter (resultobj);
PyObject *elt;
gdbpy_ref iter (PyObject_GetIter (resultobj.get ()));
if (iter == NULL)
goto done;
return NULL;
while ((elt = PyIter_Next (iter)) != NULL)
while (true)
{
gdbpy_ref elt (PyIter_Next (iter.get ()));
if (elt == NULL)
break;
if (! gdbpy_is_string (elt))
if (! gdbpy_is_string (elt.get ()))
{
/* Skip problem elements. */
Py_DECREF (elt);
continue;
}
gdb::unique_xmalloc_ptr<char>
item (python_string_to_host_string (elt));
Py_DECREF (elt);
item (python_string_to_host_string (elt.get ()));
if (item == NULL)
{
/* Skip problem elements. */
@ -381,18 +369,12 @@ cmdpy_completer (struct cmd_list_element *command,
VEC_safe_push (char_ptr, result, item.release ());
}
Py_DECREF (iter);
/* If we got some results, ignore problems. Otherwise, report
the problem. */
if (result != NULL && PyErr_Occurred ())
PyErr_Clear ();
}
done:
Py_XDECREF (resultobj);
return result;
}
@ -587,21 +569,18 @@ cmdpy_init (PyObject *self, PyObject *args, PyObject *kw)
}
if (PyObject_HasAttr (self, gdbpy_doc_cst))
{
PyObject *ds_obj = PyObject_GetAttr (self, gdbpy_doc_cst);
gdbpy_ref ds_obj (PyObject_GetAttr (self, gdbpy_doc_cst));
if (ds_obj && gdbpy_is_string (ds_obj))
if (ds_obj != NULL && gdbpy_is_string (ds_obj.get ()))
{
docstring = python_string_to_host_string (ds_obj).release ();
docstring = python_string_to_host_string (ds_obj.get ()).release ();
if (docstring == NULL)
{
xfree (cmd_name);
xfree (pfx_name);
Py_DECREF (ds_obj);
return -1;
}
}
Py_XDECREF (ds_obj);
}
if (! docstring)
docstring = xstrdup (_("This command is not documented."));