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[gdb/exp] Fix internal error when printing C++ pointer-to-member

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When running the test-case included with this patch, we run into:
...
(gdb) print ptm^M
$1 = gdb/gdbtypes.h:695: internal-error: loc_bitpos: \
  Assertion `m_loc_kind == FIELD_LOC_KIND_BITPOS' failed.^M
...
while printing a c++ pointer-to-member.

Fix this by skipping static fields in cp_find_class_member, such that we have:
...
(gdb) print ptm^M
$1 = &A::i^M
...

Tested on x86_64-linux.

Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=29294
This commit is contained in:
Tom de Vries 2022-07-05 22:41:25 +02:00
parent 99298c958c
commit 22f8e2e726
3 changed files with 66 additions and 1 deletions
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5
gdb/cp-valprint.c
View File

@ -636,7 +636,10 @@ cp_find_class_member (struct type **self_p, int *fieldno,
for (i = TYPE_N_BASECLASSES (self); i < len; i++)
{
LONGEST bitpos = self->field (i).loc_bitpos ();
field &f = self->field (i);
if (field_is_static (&f))
continue;
LONGEST bitpos = f.loc_bitpos ();
QUIT;
if (offset == bitpos)

34
gdb/testsuite/gdb.cp/pointer-to-member.cc Normal file
View File

@ -0,0 +1,34 @@
/* This testcase is part of GDB, the GNU debugger.
Copyright 2022 Free Software Foundation, Inc.
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/>. */
struct A
{
int i;
};
struct B : public A
{
static const int j = 0;
};
int B::*ptm = &B::i;
int
main ()
{
return 0;
}

28
gdb/testsuite/gdb.cp/pointer-to-member.exp Normal file
View File

@ -0,0 +1,28 @@
# Copyright (C) 2022 Free Software Foundation, Inc.
# 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/>.
# This file is part of the gdb testsuite.
# Test printing c++ pointer-to-member.
if { [skip_cplus_tests] } { continue }
standard_testfile .cc
if {[prepare_for_testing "failed to prepare" $testfile $srcfile {debug c++}]} {
return -1
}
gdb_test "print ptm" " = &A::i"