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gdb: make gdbpy_parse_command_name return a unique_xmalloc_ptr

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This avoids some manual memory management.

cmdpy_init correctly transfers ownership of the name to the
cmd_list_element, as it sets the name_allocated flag.  However,
cmdpy_init (and add_setshow_generic) doesn't, it looks like the name is
just leaked.  This is a bit tricky, because it actually creates two
commands (one set and one show), it would take a bit of refactoring of
the command code to give each their own allocated copy.  For now, just
keep doing what the current code does but in a more explicit fashion,
with an explicit release.

gdb/ChangeLog:

	* python/python-internal.h (gdbpy_parse_command_name): Return
	gdb::unique_xmalloc_ptr.
	* python/py-cmd.c (gdbpy_parse_command_name): Likewise.
	(cmdpy_init): Adjust.
	* python/py-param.c (parmpy_init): Adjust.
	(add_setshow_generic): Take gdb::unique_xmalloc_ptr, release it
	when done.

Change-Id: Iae5bc21fe2b22f12d5f954057b0aca7ca4cd3f0d
This commit is contained in:
Simon Marchi 2021-05-12 13:50:05 -04:00
parent 3db19b2d72
commit 4b8cb9dd9e
4 changed files with 61 additions and 54 deletions
Download patch file Download diff file Expand all files Collapse all files

47
gdb/python/py-cmd.c
View file

@ -342,10 +342,10 @@ cmdpy_completer (struct cmd_list_element *command,
START_LIST is the list in which the search starts.
This function returns the xmalloc()d name of the new command. On
error sets the Python error and returns NULL. */
This function returns the name of the new command. On error sets the Python
error and returns NULL. */
char *
gdb::unique_xmalloc_ptr<char>
gdbpy_parse_command_name (const char *name,
struct cmd_list_element ***base_list,
struct cmd_list_element **start_list)
@ -354,7 +354,6 @@ gdbpy_parse_command_name (const char *name,
int len = strlen (name);
int i, lastchar;
const char *prefix_text2;
char *result;
/* Skip trailing whitespace. */
for (i = len - 1; i >= 0 && (name[i] == ' ' || name[i] == '\t'); --i)
@ -369,9 +368,10 @@ gdbpy_parse_command_name (const char *name,
/* Find first character of the final word. */
for (; i > 0 && valid_cmd_char_p (name[i - 1]); --i)
;
result = (char *) xmalloc (lastchar - i + 2);
memcpy (result, &name[i], lastchar - i + 1);
result[lastchar - i + 1] = '\0';
gdb::unique_xmalloc_ptr<char> result ((char *) xmalloc (lastchar - i + 2));
memcpy (result.get (), &name[i], lastchar - i + 1);
result.get ()[lastchar - i + 1] = '\0';
/* Skip whitespace again. */
for (--i; i >= 0 && (name[i] == ' ' || name[i] == '\t'); --i)
@ -390,7 +390,6 @@ gdbpy_parse_command_name (const char *name,
{
PyErr_Format (PyExc_RuntimeError, _("Could not find command prefix %s."),
prefix_text.c_str ());
xfree (result);
return NULL;
}
@ -402,7 +401,6 @@ gdbpy_parse_command_name (const char *name,
PyErr_Format (PyExc_RuntimeError, _("'%s' is not a prefix command."),
prefix_text.c_str ());
xfree (result);
return NULL;
}
@ -435,7 +433,6 @@ cmdpy_init (PyObject *self, PyObject *args, PyObject *kw)
int completetype = -1;
char *docstring = NULL;
struct cmd_list_element **cmd_list;
char *cmd_name;
static const char *keywords[] = { "name", "command_class", "completer_class",
"prefix", NULL };
PyObject *is_prefix_obj = NULL;
@ -474,19 +471,18 @@ cmdpy_init (PyObject *self, PyObject *args, PyObject *kw)
return -1;
}
cmd_name = gdbpy_parse_command_name (name, &cmd_list, &cmdlist);
if (! cmd_name)
gdb::unique_xmalloc_ptr<char> cmd_name
= gdbpy_parse_command_name (name, &cmd_list, &cmdlist);
if (cmd_name == nullptr)
return -1;
if (is_prefix_obj != NULL)
{
int cmp = PyObject_IsTrue (is_prefix_obj);
if (cmp < 0)
{
xfree (cmd_name);
return -1;
}
is_prefix = cmp > 0;
if (cmp < 0)
return -1;
is_prefix = cmp > 0;
}
if (PyObject_HasAttr (self, gdbpy_doc_cst))
@ -497,10 +493,7 @@ cmdpy_init (PyObject *self, PyObject *args, PyObject *kw)
{
docstring = python_string_to_host_string (ds_obj.get ()).release ();
if (docstring == NULL)
{
xfree (cmd_name);
return -1;
}
return -1;
}
}
if (! docstring)
@ -519,14 +512,19 @@ cmdpy_init (PyObject *self, PyObject *args, PyObject *kw)
/* If we have our own "invoke" method, then allow unknown
sub-commands. */
allow_unknown = PyObject_HasAttr (self, invoke_cst);
cmd = add_prefix_cmd (cmd_name, (enum command_class) cmdtype,
cmd = add_prefix_cmd (cmd_name.get (),
(enum command_class) cmdtype,
NULL, docstring, &obj->sub_list,
allow_unknown, cmd_list);
}
else
cmd = add_cmd (cmd_name, (enum command_class) cmdtype,
cmd = add_cmd (cmd_name.get (), (enum command_class) cmdtype,
docstring, cmd_list);
/* If successful, the above takes ownership of the name, since we set
name_allocated, so release it. */
cmd_name.release ();
/* There appears to be no API to set this. */
cmd->func = cmdpy_function;
cmd->destroyer = cmdpy_destroyer;
@ -543,7 +541,6 @@ cmdpy_init (PyObject *self, PyObject *args, PyObject *kw)
}
catch (const gdb_exception &except)
{
xfree (cmd_name);
xfree (docstring);
gdbpy_convert_exception (except);
return -1;