2015-01-01 09:32:14 +00:00
|
|
|
# Copyright 2014-2015 Free Software Foundation, Inc.
|
Internal error trying to print uninitialized string.
Trying to print the value of a string whose size is not known at
compile-time before it gets assigned a value can lead to the following
internal error:
(gdb) p my_str
$1 =
/[...]/utils.c:1089: internal-error: virtual memory exhausted.
What happens is that my_str is described as a reference to an array
type whose bounds are dynamic. During the read of that variable's
value (in default_read_var_value), we end up resolving dynamic types
which, for reference types, makes us also resolve the target of that
reference type. This means we resolve our variable to a reference
to an array whose bounds are undefined, and unfortunately very far
appart.
So, when we pass that value to ada-valprint, and in particular to
da_val_print_ref, we eventually try to allocate too large of a buffer
corresponding to the (bogus) size of our array, hence the internal
error.
This patch fixes the problem by adding a size_check before trying
to print the dereferenced value. To perform this check, a function
that was previously specific to ada-lang.c (check_size) gets
exported, and renamed to something less prone to name collisions
(ada_ensure_varsize_limit).
gdb/ChangeLog:
* ada-lang.h (ada_ensure_varsize_limit): Declare.
* ada-lang.c (check_size): Remove advance declaration.
(ada_ensure_varsize_limit): Renames check_size.
Replace calls to check_size by calls to ada_ensure_varsize_limit
throughout.
* ada-valprint.c (ada_val_print_ref): Add call to
ada_ensure_varsize_limit. Add comment explaining why.
gdb/testsuite/ChangeLog:
* gdb.ada/str_uninit: New testcase.
2014-12-08 15:37:00 +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/>.
|
|
|
|
|
|
|
|
|
|
load_lib "ada.exp"
|
|
|
|
|
|
|
|
|
|
standard_ada_testfile parse
|
|
|
|
|
|
|
|
|
|
if {[gdb_compile_ada "${srcfile}" "${binfile}" executable [list debug ]] != "" } {
|
|
|
|
|
return -1
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
clean_restart ${testfile}
|
|
|
|
|
|
|
|
|
|
set bp_location [gdb_get_line_number "START" ${testdir}/parse.adb]
|
|
|
|
|
if ![runto "parse.adb:$bp_location" ] then {
|
|
|
|
|
perror "Couldn't run ${testfile}"
|
|
|
|
|
return
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
# Print MY_STR. Since the string has not been initialized, including
|
|
|
|
|
# its bounds, anything can happen, including an error. The purpose
|
|
|
|
|
# of this test is just to verify that we do not get an _internal_
|
|
|
|
|
# error.
|
|
|
|
|
gdb_test "print my_str" " = .*"
|
|
|
|
|
|
|
|
|
|
# Just to be certain that the debugger is really still alive,
|
|
|
|
|
# try printing something really simple.
|
|
|
|
|
gdb_test "print 1235813" " = 1235813"
|