Add test for global variable that is nested by another DSO
Commit Message
This is just a testcase addition that I am proposing for upstream GDB.
We have this in our internal tree, and the related RH bug is:
<https://bugzilla.redhat.com/show_bug.cgi?id=809179>
(You might not be able to see all the comments without privileges.)
This bug is about a global variable that got incorrectly displayed by
GDB. This bug has already been fixed a long time ago by Joel's
commit:
commit 19630284f570790ebf6d50bfb43caa1f125ee88a
Author: Joel Brobecker <brobecker@gnat.com>
Date: Tue Jun 5 13:50:50 2012 +0000
But I think a testcase for it wouldn't hurt.
So, consider the following scenario:
$ cat solib1.c
int test;
void c_main (void)
{
test = 42;
}
$ cat solib2.c
int test;
void b_main (void)
{
test = 42;
}
$ cat main.c
int main (int argc, char *argv[])
{
c_main ();
b_main ();
return 0;
}
$ gcc -g -fPIC -shared -o libSO1.so -c solib1.c
$ gcc -g -fPIC -shared -o libSO2.so -c solib2.c
$ gcc -g -o main -L$PWD -lSO1 -lSO2 main.c
$ LD_LIBRARY_PATH=. gdb -q -batch -ex 'b c_main' -ex r -ex n -ex 'p test' ./main
...
$1 = 0
This happened with GDB before Joel's commit above. Now, things work
and GDB is able to correctly display the nested global variable:
$ LD_LIBRARY_PATH=. gdb -q -batch -ex 'b c_main' -ex r -ex n -ex 'p test' ./main
...
$1 = 42
The testcase attached tests this behavior.
gdb/testsuite/ChangeLog:
2014-09-04 Sergio Durigan Junior <sergiodj@redhat.com>
* gdb.base/global-var-nested-by-dso-solib1.c: New file.
* gdb.base/global-var-nested-by-dso-solib2.c: Likewise.
* gdb.base/global-var-nested-by-dso.c: Likewise.
* gdb.base/global-var-nested-by-dso.exp: Likewise.
---
.../gdb.base/global-var-nested-by-dso-solib1.c | 24 ++++++++++
.../gdb.base/global-var-nested-by-dso-solib2.c | 24 ++++++++++
gdb/testsuite/gdb.base/global-var-nested-by-dso.c | 24 ++++++++++
.../gdb.base/global-var-nested-by-dso.exp | 55 ++++++++++++++++++++++
4 files changed, 127 insertions(+)
create mode 100644 gdb/testsuite/gdb.base/global-var-nested-by-dso-solib1.c
create mode 100644 gdb/testsuite/gdb.base/global-var-nested-by-dso-solib2.c
create mode 100644 gdb/testsuite/gdb.base/global-var-nested-by-dso.c
create mode 100644 gdb/testsuite/gdb.base/global-var-nested-by-dso.exp
Comments
On Thursday, September 04 2014, I wrote:
> This is just a testcase addition that I am proposing for upstream GDB.
Ping.
> We have this in our internal tree, and the related RH bug is:
>
> <https://bugzilla.redhat.com/show_bug.cgi?id=809179>
>
> (You might not be able to see all the comments without privileges.)
>
> This bug is about a global variable that got incorrectly displayed by
> GDB. This bug has already been fixed a long time ago by Joel's
> commit:
>
> commit 19630284f570790ebf6d50bfb43caa1f125ee88a
> Author: Joel Brobecker <brobecker@gnat.com>
> Date: Tue Jun 5 13:50:50 2012 +0000
>
> But I think a testcase for it wouldn't hurt.
>
> So, consider the following scenario:
>
> $ cat solib1.c
> int test;
> void c_main (void)
> {
> test = 42;
> }
>
> $ cat solib2.c
> int test;
> void b_main (void)
> {
> test = 42;
> }
>
> $ cat main.c
> int main (int argc, char *argv[])
> {
> c_main ();
> b_main ();
> return 0;
> }
>
> $ gcc -g -fPIC -shared -o libSO1.so -c solib1.c
> $ gcc -g -fPIC -shared -o libSO2.so -c solib2.c
> $ gcc -g -o main -L$PWD -lSO1 -lSO2 main.c
> $ LD_LIBRARY_PATH=. gdb -q -batch -ex 'b c_main' -ex r -ex n -ex 'p test' ./main
> ...
> $1 = 0
>
> This happened with GDB before Joel's commit above. Now, things work
> and GDB is able to correctly display the nested global variable:
>
> $ LD_LIBRARY_PATH=. gdb -q -batch -ex 'b c_main' -ex r -ex n -ex 'p test' ./main
> ...
> $1 = 42
>
> The testcase attached tests this behavior.
>
> gdb/testsuite/ChangeLog:
> 2014-09-04 Sergio Durigan Junior <sergiodj@redhat.com>
>
> * gdb.base/global-var-nested-by-dso-solib1.c: New file.
> * gdb.base/global-var-nested-by-dso-solib2.c: Likewise.
> * gdb.base/global-var-nested-by-dso.c: Likewise.
> * gdb.base/global-var-nested-by-dso.exp: Likewise.
> ---
> .../gdb.base/global-var-nested-by-dso-solib1.c | 24 ++++++++++
> .../gdb.base/global-var-nested-by-dso-solib2.c | 24 ++++++++++
> gdb/testsuite/gdb.base/global-var-nested-by-dso.c | 24 ++++++++++
> .../gdb.base/global-var-nested-by-dso.exp | 55 ++++++++++++++++++++++
> 4 files changed, 127 insertions(+)
> create mode 100644 gdb/testsuite/gdb.base/global-var-nested-by-dso-solib1.c
> create mode 100644 gdb/testsuite/gdb.base/global-var-nested-by-dso-solib2.c
> create mode 100644 gdb/testsuite/gdb.base/global-var-nested-by-dso.c
> create mode 100644 gdb/testsuite/gdb.base/global-var-nested-by-dso.exp
>
> diff --git a/gdb/testsuite/gdb.base/global-var-nested-by-dso-solib1.c b/gdb/testsuite/gdb.base/global-var-nested-by-dso-solib1.c
> new file mode 100644
> index 0000000..a3428da
> --- /dev/null
> +++ b/gdb/testsuite/gdb.base/global-var-nested-by-dso-solib1.c
> @@ -0,0 +1,24 @@
> +/* Copyright 2014 Free Software Foundation, Inc.
> +
> + This file is part of GDB.
> +
> + 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/>. */
> +
> +int test;
> +
> +void
> +c_main (void)
> +{
> + test = 42;
> +}
> diff --git a/gdb/testsuite/gdb.base/global-var-nested-by-dso-solib2.c b/gdb/testsuite/gdb.base/global-var-nested-by-dso-solib2.c
> new file mode 100644
> index 0000000..2c58166
> --- /dev/null
> +++ b/gdb/testsuite/gdb.base/global-var-nested-by-dso-solib2.c
> @@ -0,0 +1,24 @@
> +/* Copyright 2014 Free Software Foundation, Inc.
> +
> + This file is part of GDB.
> +
> + 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/>. */
> +
> +int test;
> +
> +void
> +b_main (void)
> +{
> + test = 42;
> +}
> diff --git a/gdb/testsuite/gdb.base/global-var-nested-by-dso.c b/gdb/testsuite/gdb.base/global-var-nested-by-dso.c
> new file mode 100644
> index 0000000..3b63096
> --- /dev/null
> +++ b/gdb/testsuite/gdb.base/global-var-nested-by-dso.c
> @@ -0,0 +1,24 @@
> +/* Copyright 2014 Free Software Foundation, Inc.
> +
> + This file is part of GDB.
> +
> + 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/>. */
> +
> +int
> +main (int argc, char *argv[])
> +{
> + c_main ();
> + b_main ();
> + return 0;
> +}
> diff --git a/gdb/testsuite/gdb.base/global-var-nested-by-dso.exp b/gdb/testsuite/gdb.base/global-var-nested-by-dso.exp
> new file mode 100644
> index 0000000..e1e208a
> --- /dev/null
> +++ b/gdb/testsuite/gdb.base/global-var-nested-by-dso.exp
> @@ -0,0 +1,55 @@
> +# Copyright 2014 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/>.
> +
> +if { [skip_shlib_tests] } {
> + return 0
> +}
> +
> +standard_testfile
> +
> +set lib1name $testfile-solib1
> +set srcfile_lib1 $srcdir/$subdir/$lib1name.c
> +set binfile_lib1 [standard_output_file $lib1name.so]
> +
> +set lib2name $testfile-solib2
> +set srcfile_lib2 $srcdir/$subdir/$lib2name.c
> +set binfile_lib2 [standard_output_file $lib2name.so]
> +
> +if { [gdb_compile_shlib $srcfile_lib1 $binfile_lib1 \
> + [list debug additional_flags=-fPIC]] != "" } {
> + untested "Could not compile $binfile_lib1."
> + return -1
> +}
> +
> +if { [gdb_compile_shlib $srcfile_lib2 $binfile_lib2 \
> + [list debug additional_flags=-fPIC]] != "" } {
> + untested "Could not compile $binfile_lib2."
> + return -1
> +}
> +
> +if { [gdb_compile $srcdir/$subdir/$srcfile $binfile executable \
> + [list debug shlib=$binfile_lib1 shlib=$binfile_lib2]] != "" } {
> + return -1
> +}
> +
> +clean_restart $binfile
> +
> +if { ![runto_main] } {
> + return -1
> +}
> +
> +gdb_test "next" "$decimal.*b_main \\(\\);"
> +gdb_test "next" "$decimal.*return 0;"
> +gdb_test "print test" " = 42"
> --
> 1.9.3
> > gdb/testsuite/ChangeLog:
> > 2014-09-04 Sergio Durigan Junior <sergiodj@redhat.com>
> >
> > * gdb.base/global-var-nested-by-dso-solib1.c: New file.
> > * gdb.base/global-var-nested-by-dso-solib2.c: Likewise.
> > * gdb.base/global-var-nested-by-dso.c: Likewise.
> > * gdb.base/global-var-nested-by-dso.exp: Likewise.
Sorry it took so long to review this patch. This looks good to me,
so go ahead and commit.
Thank you also for writing testcases. These are not always our
favorite past-time, but their usefulness can never be overstated.
Thank you,
On Tuesday, September 16 2014, Joel Brobecker wrote:
>> > gdb/testsuite/ChangeLog:
>> > 2014-09-04 Sergio Durigan Junior <sergiodj@redhat.com>
>> >
>> > * gdb.base/global-var-nested-by-dso-solib1.c: New file.
>> > * gdb.base/global-var-nested-by-dso-solib2.c: Likewise.
>> > * gdb.base/global-var-nested-by-dso.c: Likewise.
>> > * gdb.base/global-var-nested-by-dso.exp: Likewise.
>
> Sorry it took so long to review this patch. This looks good to me,
> so go ahead and commit.
Thanks a lot, Joel :-).
Pushed:
<https://sourceware.org/ml/gdb-cvs/2014-09/msg00075.html>
<https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=a594760181bc3859df1f19e3cca361ad7d031bd9>
> Thank you also for writing testcases. These are not always our
> favorite past-time, but their usefulness can never be overstated.
My pleasure :-).
Cheers,
new file mode 100644
@@ -0,0 +1,24 @@
+/* Copyright 2014 Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ 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/>. */
+
+int test;
+
+void
+c_main (void)
+{
+ test = 42;
+}
new file mode 100644
@@ -0,0 +1,24 @@
+/* Copyright 2014 Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ 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/>. */
+
+int test;
+
+void
+b_main (void)
+{
+ test = 42;
+}
new file mode 100644
@@ -0,0 +1,24 @@
+/* Copyright 2014 Free Software Foundation, Inc.
+
+ This file is part of GDB.
+
+ 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/>. */
+
+int
+main (int argc, char *argv[])
+{
+ c_main ();
+ b_main ();
+ return 0;
+}
new file mode 100644
@@ -0,0 +1,55 @@
+# Copyright 2014 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/>.
+
+if { [skip_shlib_tests] } {
+ return 0
+}
+
+standard_testfile
+
+set lib1name $testfile-solib1
+set srcfile_lib1 $srcdir/$subdir/$lib1name.c
+set binfile_lib1 [standard_output_file $lib1name.so]
+
+set lib2name $testfile-solib2
+set srcfile_lib2 $srcdir/$subdir/$lib2name.c
+set binfile_lib2 [standard_output_file $lib2name.so]
+
+if { [gdb_compile_shlib $srcfile_lib1 $binfile_lib1 \
+ [list debug additional_flags=-fPIC]] != "" } {
+ untested "Could not compile $binfile_lib1."
+ return -1
+}
+
+if { [gdb_compile_shlib $srcfile_lib2 $binfile_lib2 \
+ [list debug additional_flags=-fPIC]] != "" } {
+ untested "Could not compile $binfile_lib2."
+ return -1
+}
+
+if { [gdb_compile $srcdir/$subdir/$srcfile $binfile executable \
+ [list debug shlib=$binfile_lib1 shlib=$binfile_lib2]] != "" } {
+ return -1
+}
+
+clean_restart $binfile
+
+if { ![runto_main] } {
+ return -1
+}
+
+gdb_test "next" "$decimal.*b_main \\(\\);"
+gdb_test "next" "$decimal.*return 0;"
+gdb_test "print test" " = 42"