2015-01-01 09:32:14 +00:00
|
|
|
-- Copyright 2013-2015 Free Software Foundation, Inc.
|
Dandling memory pointers in Ada catchpoints with GDB/MI.
When using the GDB/MI commands to insert a catchpoint on a specific
Ada exception, any re-evaluation of that catchpoint (for instance
a re-evaluation performed after a shared library got mapped by the
inferior) fails. For instance, with any Ada program:
(gdb)
-catch-exception -e program_error
^done,bkptno="1",bkpt={[...]}
(gdb)
-exec-run
=thread-group-started,id="i1",pid="28315"
=thread-created,id="1",group-id="i1"
^running
*running,thread-id="all"
(gdb)
=library-loaded,[...]
&"warning: failed to reevaluate internal exception condition for catchpoint 1: No definition of \"exec\" in current context.\n"
&"warning: failed to reevaluate internal exception condition for catchpoint 1: No definition of \"exec\" in current context.\n"
[...]
The same is true if using an Ada exception catchpoint.
The problem comes from the fact that that we deallocate the strings
given as arguments to create_ada_exception_catchpoint, while the latter
just makes shallow copies of those strings, thus creating dandling
pointers.
This patch fixes the issue by passing freshly allocated strings to
create_ada_exception_catchpoint, while at the same time updating
create_ada_exception_catchpoint's documentation to make it clear
that deallocating the strings is no longer the responsibility of
the caller.
gdb/ChangeLog:
* ada-lang.c (create_ada_exception_catchpoint): Enhance
the documentation of fields "except_string" and "condition".
* mi/mi-cmd-catch.c (mi_cmd_catch_assert): Reallocate
CONDITION on the heap before passing it to
create_ada_exception_catchpoint.
(mi_cmd_catch_exception): Likewise for EXCEPTION_NAME and
CONDITION.
gdb/testsuite/ChangeLog:
* gdb.ada/mi_ex_cond: New testcase.
Tested on x86_64-linux. The "-break-list" test FAILs without
this patch.
2013-10-30 10:18:24 +00:00
|
|
|
--
|
|
|
|
|
-- This program is free software; you can redistribute it and/or modify
|
|
|
|
|
-- it under the terms of the GNU General Public License as published by
|
|
|
|
|
-- the Free Software Foundation; either version 3 of the License, or
|
|
|
|
|
-- (at your option) any later version.
|
|
|
|
|
--
|
|
|
|
|
-- This program is distributed in the hope that it will be useful,
|
|
|
|
|
-- but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
|
|
|
-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
|
|
|
-- GNU General Public License for more details.
|
|
|
|
|
--
|
|
|
|
|
-- You should have received a copy of the GNU General Public License
|
|
|
|
|
-- along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
|
|
|
|
|
|
with Pck; use Pck;
|
|
|
|
|
|
|
|
|
|
procedure Foo is
|
|
|
|
|
begin
|
|
|
|
|
while I <= 3 loop
|
|
|
|
|
begin
|
|
|
|
|
raise Constraint_Error;
|
|
|
|
|
exception
|
|
|
|
|
when others =>
|
|
|
|
|
null;
|
|
|
|
|
end;
|
|
|
|
|
I := I + 1;
|
|
|
|
|
end loop;
|
|
|
|
|
end Foo;
|