[committed][gdb/testsuite] Add test-case gdb.dwarf2/break-inline-psymtab.exp

[Tom de Vries <tdevries@suse.de>]

[-- Attachment #1: Type: text/plain, Size: 1314 bytes --]

[ was: Re: [PATCH][gdb/symtab] Fix check-psymtab failure for inline
function ]

On 11-03-2020 01:08, Tom Tromey wrote:
>>>>>> "Tom" == Tom de Vries <tdevries@suse.de> writes:
> 
> Tom> When loading the executable in gdb, we create a partial symbol for foo, but
> Tom> after expansion into a full symbol table no actual symbol is created,
> Tom> resulting in a maint check-psymtab failure:
> Tom> ...
> Tom> (gdb) maint check-psymtab
> Tom> Static symbol `foo' only found in inline.c psymtab
> Tom> ...
> 
> Tom> Fix this by preventing the creation of this type of partial symbol.
> 
> With this patch, if there is a function which is only inlined (there is
> no "out-line" copy), will "break function" still work?
> 
> It seems to me that it wouldn't always, because there wouldn't be a
> partial symbol to match.  Maybe it might work accidentally if the inline
> function appears in a CU that is already expanded, like main's.  So the
> test would have to be an always-inline function that isn't used in
> main's CU.
> 

I managed to construct a test-case like that, which:
- passes with master, and
- fails if I apply the "preventing the creation of this type of partial
  symbol" patch.

Since it seems there's no other test-case in the testsuite testing this
behaviour ... committed as obvious.

Thanks,
- Tom

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[gdb/testsuite] Add test-case gdb.dwarf2/break-inline-psymtab.exp

Add a test-case that tests whether we can set a breakpoint on an inlined
inline function in CU for which the partial symtab has not yet been expanded.

Tested on x86_64-linux, with gcc 4.8.5, gcc-7.5.0, gcc-10.0.1, and clang
5.0.2.

gdb/testsuite/ChangeLog:

2020-03-18  Tom de Vries  <tdevries@suse.de>

	* gdb.dwarf2/break-inline-psymtab-2.c: New test.
	* gdb.dwarf2/break-inline-psymtab.c: New test.
	* gdb.dwarf2/break-inline-psymtab.exp: New file.

---
 gdb/testsuite/gdb.dwarf2/break-inline-psymtab-2.c | 33 +++++++++++++++++++++
 gdb/testsuite/gdb.dwarf2/break-inline-psymtab.c   | 24 +++++++++++++++
 gdb/testsuite/gdb.dwarf2/break-inline-psymtab.exp | 36 +++++++++++++++++++++++
 3 files changed, 93 insertions(+)

diff --git a/gdb/testsuite/gdb.dwarf2/break-inline-psymtab-2.c b/gdb/testsuite/gdb.dwarf2/break-inline-psymtab-2.c
new file mode 100644
index 0000000000..38c69336f2
--- /dev/null
+++ b/gdb/testsuite/gdb.dwarf2/break-inline-psymtab-2.c
@@ -0,0 +1,33 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2020 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/>.  */
+
+extern int foo (void);
+
+int a;
+
+static inline int
+bar (void)
+{
+  a = 2;
+  return 0;
+}
+
+int
+foo (void)
+{
+  return bar ();
+}
diff --git a/gdb/testsuite/gdb.dwarf2/break-inline-psymtab.c b/gdb/testsuite/gdb.dwarf2/break-inline-psymtab.c
new file mode 100644
index 0000000000..74cea4bf90
--- /dev/null
+++ b/gdb/testsuite/gdb.dwarf2/break-inline-psymtab.c
@@ -0,0 +1,24 @@
+/* This testcase is part of GDB, the GNU debugger.
+
+   Copyright 2020 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/>.  */
+
+extern int foo (void);
+
+int
+main (void)
+{
+  return foo ();
+}
diff --git a/gdb/testsuite/gdb.dwarf2/break-inline-psymtab.exp b/gdb/testsuite/gdb.dwarf2/break-inline-psymtab.exp
new file mode 100644
index 0000000000..adbe8620aa
--- /dev/null
+++ b/gdb/testsuite/gdb.dwarf2/break-inline-psymtab.exp
@@ -0,0 +1,36 @@
+# Copyright 2019-2020 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/>.
+
+standard_testfile break-inline-psymtab.c break-inline-psymtab-2.c
+
+set sources [list $srcfile $srcfile2]
+set opts {debug optimize=-O2}
+if { [prepare_for_testing "failed to prepare" ${testfile} $sources $opts] } {
+    return -1
+}
+
+if ![runto_main] {
+    return -1
+}
+
+get_compiler_info
+get_debug_format
+if { [skip_inline_frame_tests] } {
+    return -1
+}
+
+# Set a break-point in inline function bar, in a CU for which the partial
+# symtab has not been expanded.
+gdb_breakpoint "bar" message