GDBserver self tests

This patch uses GDB self test in GDBserver.  The self tests are run if
GDBserver is started with option --selftest.

gdb:

2017-08-18  Yao Qi  <yao.qi@linaro.org>

	* NEWS: Mention GDBserver's new option "--selftest".
	* Makefile.in (SFILES): Remove selftest.c, add common/selftest.c.
	* selftest.c: Move it to common/selftest.c.
	* selftest.h: Move it to common/selftest.h.
	* selftest-arch.c (reset): New function.
	(tests_with_arch): Call reset.

gdb/gdbserver:

2017-08-18  Yao Qi  <yao.qi@linaro.org>

	* Makefile.in (OBS): Add selftest.o.
	* configure.ac: AC_DEFINE GDB_SELF_TEST if $development.
	* configure, config.in: Re-generated.
	* server.c: Include common/sefltest.h.
	(captured_main): Handle option --selftest.

gdb/testsuite:

2017-08-18  Yao Qi  <yao.qi@linaro.org>

	* gdb.server/unittest.exp: New.

gdb/doc:

2017-08-18  Yao Qi  <yao.qi@linaro.org>

	* gdb.texinfo (Server): Document "--selftest".

2 files changed, 118 insertions, 0 deletions

diff --git a/gdb/common/selftest.c b/gdb/common/selftest.c
new file mode 100644
index 0000000..0fb8f2a
--- /dev/null
+++ b/gdb/common/selftest.c
@@ -0,0 +1,66 @@
+/* GDB self-testing.
+   Copyright (C) 2016-2017 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/>.  */
+
+#include "common-defs.h"
+#include "common-exceptions.h"
+#include "common-debug.h"
+#include "selftest.h"
+#include <vector>
+
+namespace selftests
+{
+
+/* All the tests that have been registered.  */
+
+static std::vector<self_test_function *> tests;
+
+/* See selftest.h.  */
+
+void
+register_test (self_test_function *function)
+{
+  tests.push_back (function);
+}
+
+/* See selftest.h.  */
+
+void
+run_tests (void)
+{
+  int failed = 0;
+
+  for (int i = 0; i < tests.size (); ++i)
+    {
+      TRY
+	{
+	  tests[i] ();
+	}
+      CATCH (ex, RETURN_MASK_ERROR)
+	{
+	  ++failed;
+	  debug_printf ("Self test failed: %s\n", ex.message);
+	}
+      END_CATCH
+
+      reset ();
+    }
+
+  debug_printf ("Ran %lu unit tests, %d failed\n",
+		(long) tests.size (), failed);
+}
+} // namespace selftests
diff --git a/gdb/common/selftest.h b/gdb/common/selftest.h
new file mode 100644
index 0000000..e211c34
--- /dev/null
+++ b/gdb/common/selftest.h
@@ -0,0 +1,52 @@
+/* GDB self-testing.
+   Copyright (C) 2016-2017 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/>.  */
+
+#ifndef SELFTEST_H
+#define SELFTEST_H
+
+/* A test is just a function that does some checks and throws an
+   exception if something has gone wrong.  */
+
+typedef void self_test_function (void);
+
+namespace selftests
+{
+
+/* Register a new self-test.  */
+
+extern void register_test (self_test_function *function);
+
+/* Run all the self tests.  This print a message describing the number
+   of test and the number of failures.  */
+
+extern void run_tests (void);
+
+/* Reset GDB or GDBserver's internal state.  */
+extern void reset ();
+
+}
+
+/* Check that VALUE is true, and, if not, throw an exception.  */
+
+#define SELF_CHECK(VALUE)						\
+  do {									\
+    if (!(VALUE))							\
+      error (_("self-test failed at %s:%d"), __FILE__, __LINE__);	\
+  } while (0)
+
+#endif /* SELFTEST_H */