gnatdbg.utils.register_pretty_printers: refactor and enhance testing

Change-Id: Iba8c063b1030907ca630781d61ea1949045e39ef
TN: RC14-025

Author: pmderodat

gnatdbg/utils.py

@@ -11,9 +11,10 @@
     for name in dir(gdb)
     if name.startswith('TYPE_CODE_')
 }
+objfile_filter_true = lambda objfile: True # no-code-coverage
 
 
-def register_pretty_printers(printers, objfile_filter=lambda objfile: True):
+def register_pretty_printers(printers, objfile_filter=objfile_filter_true):
     """
     Register pretty-printers in existing objfiles and register a hook to
     register them in all objfiles that will be loaded.

testsuite/tests/misc/setup/test.py

@@ -16,3 +16,8 @@
 gdb.run_to(gdb.find_loc('foo.adb', 'BREAK'))
 gdb.test('python import gnatdbg; gnatdbg.setup(globally=False)', '')
 gdb.print_expr('empty_string', 'Unbounded_String ("")')
+
+# Re-load and re-run foo, just to make sure the new_objfile event is run.
+gdb.kill()
+gdb.run_to(gdb.find_loc('foo.adb', 'BREAK'))
+gdb.print_expr('empty_string', 'Unbounded_String ("")')