f7e44f6574
In GDB/MI mode, trying to print the arguments of the frame corresponding
to the body of a task ("-stack-list-arguments 1") causes the debugger to
crash.
This is because the compiler adds an implicit argument to that task body
called "_task". mi/mi-cmd-stack.c:list_args_or_locals, which is
responsible for printing the value of our arguments, finds that our
"_task" symbol is an argument, and thus tries to fing the non-argument
equivalent:
if (SYMBOL_IS_ARGUMENT (sym))
sym2 = lookup_symbol (SYMBOL_NATURAL_NAME (sym),
block, VAR_DOMAIN,
(int *) NULL);
Unfortunately, it tries using the natural name, which doesn't always
work for Ada parameters, in particular those who are internally-
generated. In our case, The "_task" parameter's natural name is
"<_task>", and that symbol does not exist. So sym2 is NULL, thus
causing the crash a little later on when trying to dereference it.
We should be using the symbol linkage name in this case, the same
way iterate_over_block_arg_vars already does.
gdb/ChangeLog:
* mi/mi-cmd-stack.c (list_args_or_locals): For argument symbols,
use SYMBOL_LINKAGE_NAME to find the corresponding non-argument
symbol. Add assertion that sym2 is never NULL.
gdb/testsuite/ChangeLog:
* gdb.ada/mi_task_arg: New testcase.
70 lines
1.7 KiB
Ada
70 lines
1.7 KiB
Ada
-- Copyright 2011-2012 Free Software Foundation, Inc.
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--
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-- This program is free software; you can redistribute it and/or modify
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-- it under the terms of the GNU General Public License as published by
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-- the Free Software Foundation; either version 3 of the License, or
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-- (at your option) any later version.
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--
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-- This program is distributed in the hope that it will be useful,
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-- but WITHOUT ANY WARRANTY; without even the implied warranty of
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-- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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-- GNU General Public License for more details.
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--
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-- You should have received a copy of the GNU General Public License
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-- along with this program. If not, see <http://www.gnu.org/licenses/>.
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procedure Task_Switch is
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-------------------
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-- Declaractions --
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-------------------
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task type Callee is
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entry Finito;
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end Callee;
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type Callee_Ptr is access Callee;
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task type Caller is
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end Caller;
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type Caller_Ptr is access Caller;
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procedure Break_Me;
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My_Caller : Caller_Ptr;
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My_Callee : Callee_Ptr;
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------------
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-- Bodies --
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------------
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task body Callee is
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begin
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-- Just wait until we are told to terminate this task.
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-- This is just to maintain this task alive.
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accept Finito do
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null;
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end Finito;
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end Callee;
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task body Caller is
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begin
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Break_Me;
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My_Callee.Finito;
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end Caller;
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procedure Break_Me is
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begin
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null;
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end Break_Me;
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begin
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-- Make sure to create the Callee task first... And then give it
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-- enough time to complete its activation phase before we start
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-- the Caller task.
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My_Callee := new Callee;
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delay 0.1;
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My_Caller := new Caller;
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end Task_Switch;
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