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Fix Python gdb.Breakpoint.location crash

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I noticed today that gdb.Breakpoint.location will crash when applied
to a catchpoint made with "catch throw".

The bug is that "catch throw" makes a breakpoint that is of type
bp_breakpoint, but which does not have a location.

Regression tested on x86-64 Fedora 28.

gdb/ChangeLog
2018-10-06  Tom Tromey  <tom@tromey.com>

	* python/py-breakpoint.c (bppy_get_location): Handle a
	bp_breakpoint without a location.

gdb/testsuite/ChangeLog
2018-10-06  Tom Tromey  <tom@tromey.com>

	* gdb.python/py-breakpoint.exp (check_last_event): Check location
	of a "throw" catchpoint.
This commit is contained in:
Tom Tromey 2018-09-18 06:27:09 -06:00
parent 2fb009bbd1
commit 2a8be20359
4 changed files with 21 additions and 1 deletions
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7
gdb/python/py-breakpoint.c
View file

@ -391,7 +391,12 @@ bppy_get_location (PyObject *self, void *closure)
if (obj->bp->type != bp_breakpoint)
Py_RETURN_NONE;
str = event_location_to_string (obj->bp->location.get ());
struct event_location *location = obj->bp->location.get ();
/* "catch throw" makes a breakpoint of type bp_breakpoint that does
not have a location. */
if (location == nullptr)
Py_RETURN_NONE;
str = event_location_to_string (location);
if (! str)
str = "";
return host_string_to_python_string (str);