Return gdbpy_ref from some Python string functions

This changes python_string_to_unicode,
python_string_to_target_python_string, and
host_string_to_python_string to return gdbpy_ref.

gdb/ChangeLog
2018-11-04  Tom Tromey  <tom@tromey.com>

	* python/python.c (gdbpy_parameter_value): Update.
	* python/python-internal.h (python_string_to_unicode)
	(python_string_to_target_python_string)
	(host_string_to_python_string): Return gdbpy_ref.
	* python/py-utils.c (python_string_to_unicode)
	(unicode_to_encoded_python_string)
	(unicode_to_target_python_string)
	(python_string_to_target_string)
	(python_string_to_target_python_string): Return gdbpy_ref.
	(python_string_to_host_string): Update.
	(host_string_to_python_string): Return gdbpy_ref.
	* python/py-symtab.c (stpy_get_filename, stpy_get_producer)
	(stpy_fullname): Update.
	* python/py-progspace.c (pspy_get_filename, pspy_solib_name):
	Update.
	* python/py-prettyprint.c (print_string_repr): Update.
	* python/py-objfile.c (objfpy_get_filename, objfpy_get_username)
	(objfpy_get_build_id): Update.
	* python/py-breakpoint.c (bppy_get_location)
	(bppy_get_expression, bppy_get_condition, bppy_get_commands):
	Update.

1 files changed, 3 insertions, 3 deletions

diff --git a/gdb/python/python-internal.h b/gdb/python/python-internal.h
index 5f15a33..582044a 100644
--- a/gdb/python/python-internal.h
+++ b/gdb/python/python-internal.h
@@ -656,12 +656,12 @@ int gdbpy_print_python_errors_p (void);
 void gdbpy_print_stack (void);
 void gdbpy_handle_exception () ATTRIBUTE_NORETURN;
 
-PyObject *python_string_to_unicode (PyObject *obj);
+gdbpy_ref<> python_string_to_unicode (PyObject *obj);
 gdb::unique_xmalloc_ptr<char> unicode_to_target_string (PyObject *unicode_str);
 gdb::unique_xmalloc_ptr<char> python_string_to_target_string (PyObject *obj);
-PyObject *python_string_to_target_python_string (PyObject *obj);
+gdbpy_ref<> python_string_to_target_python_string (PyObject *obj);
 gdb::unique_xmalloc_ptr<char> python_string_to_host_string (PyObject *obj);
-PyObject *host_string_to_python_string (const char *str);
+gdbpy_ref<> host_string_to_python_string (const char *str);
 int gdbpy_is_string (PyObject *obj);
 gdb::unique_xmalloc_ptr<char> gdbpy_obj_to_string (PyObject *obj);
 gdb::unique_xmalloc_ptr<char> gdbpy_exception_to_string (PyObject *ptype,