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authorTom Tromey <tom@tromey.com>2016-10-15 09:20:02 -0600
committerTom Tromey <tom@tromey.com>2016-11-09 19:40:12 -0700
commit9b9720149dfee4a9a961c29d0382fc5bdf9c975b (patch)
tree2cc05b39a9e63376818a11e7f56954f25f9fb963 /gdb/python/py-breakpoint.c
parent4e9d2153228d95c972907a8b13237218d380c5d3 (diff)
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Use unique_xmalloc_ptr in Python code
This changes some utility functions in the Python code to return unique_xmalloc_ptr, and then fixes up the callers. I chose unique_xmalloc_ptr rather than std::string because at a few call points the xmalloc'd string is released and ownership transferred elsewhere. This patch found a few existing memory leaks. For example, py-unwind.c called gdbpy_obj_to_string but never freed the result. Built and regression tested on the buildbot. 2016-11-09 Tom Tromey <tom@tromey.com> * varobj.h (varobj_get_display_hint): Change return type. * varobj.c (varobj_get_display_hint): Return unique_xmalloc_ptr. (varobj_value_get_print_value): Update. * python/python.c (gdbpy_before_prompt_hook, gdbpy_print_stack) (gdbpy_apply_type_printers): Update. * python/python-internal.h (unicode_to_target_string) (python_string_to_target_string, python_string_to_host_string) (gdbpy_obj_to_string, gdbpy_exception_to_string) (gdbpy_get_display_hint): Change return types. * python/py-varobj.c (py_varobj_iter_next): Update. * python/py-value.c (valpy_getitem, convert_value_from_python): Update. * python/py-utils.c (unicode_to_encoded_string) (unicode_to_target_string, python_string_to_target_string) (python_string_to_host_string, gdbpy_obj_to_string) (gdbpy_exception_to_string): Return unique_xmalloc_ptr. * python/py-unwind.c (pyuw_parse_register_id): Update. * python/py-type.c (typy_getitem): Update. * python/py-prettyprint.c (gdbpy_get_display_hint) (print_stack_unless_memory_error, print_children) (gdbpy_apply_val_pretty_printer): Update. * python/py-param.c (set_parameter_value): Update. (get_doc_string, call_doc_function): Return unique_xmalloc_ptr. (get_set_value, get_show_value, compute_enum_values, parmpy_init): Update. * python/py-infthread.c (thpy_set_name): Update. * python/py-function.c (fnpy_call, fnpy_init): Update. * python/py-framefilter.c (extract_sym): Change "name" to unique_xmalloc_ptr. (enumerate_args, enumerate_locals): Update. (py_print_frame): Use unique_xmalloc_ptr. * python/py-frame.c (frapy_read_var): Update. Remove cleanup. * python/py-cmd.c (cmdpy_function, cmdpy_completer, cmdpy_init): Update. * python/py-breakpoint.c (bppy_set_condition): Use unique_xmalloc_ptr. (bppy_init): Likewise. Remove cleanup. (local_setattro): Update. * mi/mi-cmd-var.c (print_varobj, mi_cmd_var_list_children) (varobj_update_one): Update.
Diffstat (limited to 'gdb/python/py-breakpoint.c')
-rw-r--r--gdb/python/py-breakpoint.c30
1 files changed, 14 insertions, 16 deletions
diff --git a/gdb/python/py-breakpoint.c b/gdb/python/py-breakpoint.c
index e61cbcd..0897acf 100644
--- a/gdb/python/py-breakpoint.c
+++ b/gdb/python/py-breakpoint.c
@@ -440,7 +440,8 @@ bppy_get_condition (PyObject *self, void *closure)
static int
bppy_set_condition (PyObject *self, PyObject *newvalue, void *closure)
{
- char *exp;
+ gdb::unique_xmalloc_ptr<char> exp_holder;
+ const char *exp = NULL;
gdbpy_breakpoint_object *self_bp = (gdbpy_breakpoint_object *) self;
struct gdb_exception except = exception_none;
@@ -456,9 +457,10 @@ bppy_set_condition (PyObject *self, PyObject *newvalue, void *closure)
exp = "";
else
{
- exp = python_string_to_host_string (newvalue);
- if (exp == NULL)
+ exp_holder = python_string_to_host_string (newvalue);
+ if (exp_holder == NULL)
return -1;
+ exp = exp_holder.get ();
}
TRY
@@ -471,9 +473,6 @@ bppy_set_condition (PyObject *self, PyObject *newvalue, void *closure)
}
END_CATCH
- if (newvalue != Py_None)
- xfree (exp);
-
GDB_PY_SET_HANDLE_EXCEPTION (except);
return 0;
@@ -680,18 +679,20 @@ bppy_init (PyObject *self, PyObject *args, PyObject *kwargs)
TRY
{
- char *copy = xstrdup (skip_spaces_const (spec));
- struct cleanup *cleanup = make_cleanup (xfree, copy);
+ gdb::unique_xmalloc_ptr<char>
+ copy_holder (xstrdup (skip_spaces_const (spec)));
+ char *copy = copy_holder.get ();
switch (type)
{
case bp_breakpoint:
{
struct event_location *location;
+ struct cleanup *cleanup;
location
= string_to_event_location_basic (&copy, current_language);
- make_cleanup_delete_event_location (location);
+ cleanup = make_cleanup_delete_event_location (location);
create_breakpoint (python_gdbarch,
location, NULL, -1, NULL,
0,
@@ -700,6 +701,8 @@ bppy_init (PyObject *self, PyObject *args, PyObject *kwargs)
AUTO_BOOLEAN_TRUE,
&bkpt_breakpoint_ops,
0, 1, internal_bp, 0);
+
+ do_cleanups (cleanup);
break;
}
case bp_watchpoint:
@@ -717,8 +720,6 @@ bppy_init (PyObject *self, PyObject *args, PyObject *kwargs)
default:
error(_("Do not understand breakpoint type to set."));
}
-
- do_cleanups (cleanup);
}
CATCH (except, RETURN_MASK_ALL)
{
@@ -1043,7 +1044,7 @@ static int
local_setattro (PyObject *self, PyObject *name, PyObject *v)
{
gdbpy_breakpoint_object *obj = (gdbpy_breakpoint_object *) self;
- char *attr = python_string_to_host_string (name);
+ gdb::unique_xmalloc_ptr<char> attr (python_string_to_host_string (name));
if (attr == NULL)
return -1;
@@ -1051,7 +1052,7 @@ local_setattro (PyObject *self, PyObject *name, PyObject *v)
/* If the attribute trying to be set is the "stop" method,
but we already have a condition set in the CLI or other extension
language, disallow this operation. */
- if (strcmp (attr, stop_func) == 0)
+ if (strcmp (attr.get (), stop_func) == 0)
{
const struct extension_language_defn *extlang = NULL;
@@ -1063,7 +1064,6 @@ local_setattro (PyObject *self, PyObject *name, PyObject *v)
{
char *error_text;
- xfree (attr);
error_text
= xstrprintf (_("Only one stop condition allowed. There is"
" currently a %s stop condition defined for"
@@ -1075,8 +1075,6 @@ local_setattro (PyObject *self, PyObject *name, PyObject *v)
}
}
- xfree (attr);
-
return PyObject_GenericSetAttr ((PyObject *)self, name, v);
}