gdb: allow specifying multiple filters when running selftests

I found myself wanting to run a few specific selftests while developing.
I thought it would be nice to be able to provide multiple test names
when running `maintenant selftests`.  The arguments to that command is
currently interpreted as a single filter (not split by spaces), it now
becomes a list a filters, split by spaces.  A test is executed when it
matches at least one filter.

Here's an example of the result in GDB:

    (gdb) maintenance selftest xml
    Running selftest xml_escape_text.
    Running selftest xml_escape_text_append.
    Ran 2 unit tests, 0 failed
    (gdb) maintenance selftest xml unord
    Running selftest unordered_remove.
    Running selftest xml_escape_text.
    Running selftest xml_escape_text_append.
    Ran 3 unit tests, 0 failed
    (gdb) maintenance selftest xml unord foobar
    Running selftest unordered_remove.
    Running selftest xml_escape_text.
    Running selftest xml_escape_text_append.
    Ran 3 unit tests, 0 failed

Since the selftest machinery is also shared with gdbserver, I also
adapted gdbserver.  It accepts a `--selftest` switch, which accepts an
optional filter argument.  I made it so you can now pass `--selftest`
multiple time to add filters.

It's not so useful right now though: there's only a single selftest
right now in GDB and it's for an architecture I can't compile.  So I
tested by adding dummy tests, here's an example of the result:

    $ ./gdbserver --selftest=foo
    Running selftest foo.
    foo
    Running selftest foobar.
    foobar
    Ran 2 unit tests, 0 failed
    $ ./gdbserver --selftest=foo --selftest=bar
    Running selftest bar.
    bar
    Running selftest foo.
    foo
    Running selftest foobar.
    foobar
    Ran 3 unit tests, 0 failed

gdbsupport/ChangeLog:

	* selftest.h (run_tests): Change parameter to array_view.
	* selftest.c (run_tests): Change parameter to array_view and use
	it.

gdb/ChangeLog:

	* maint.c (maintenance_selftest): Split args and pass array_view
	to run_tests.

gdbserver/ChangeLog:

	* server.cc (captured_main): Accept multiple `--selftest=`
	options.  Pass all `--selftest=` arguments to run_tests.

Change-Id: I422bd49f08ea8095ae174c5d66a2dd502a59613a

gdb/ChangeLog

@@ -1,3 +1,8 @@
+2020-08-13  Simon Marchi  <simon.marchi@polymtl.ca>
+
+	* maint.c (maintenance_selftest): Split args and pass array_view
+	to run_tests.
+
 2020-08-12  Luis Machado  <luis.machado@linaro.org>
 
 	* value.c (check_type_length_before_alloc): Use ULONGEST to store a

gdb/maint.c

@@ -1041,7 +1041,8 @@ static void
 maintenance_selftest (const char *args, int from_tty)
 {
 #if GDB_SELF_TEST
-  selftests::run_tests (args);
+  gdb_argv argv (args);
+  selftests::run_tests (gdb::array_view<char *> (argv.get (), argv.count ()));
 #else
   printf_filtered (_("\
 Selftests have been disabled for this build.\n"));

gdbserver/ChangeLog

@@ -1,3 +1,8 @@
+2020-08-13  Simon Marchi  <simon.marchi@polymtl.ca>
+
+	* server.cc (captured_main): Accept multiple `--selftest=`
+	options.  Pass all `--selftest=` arguments to run_tests.
+
 2020-07-30  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	* configure, config.in: Regenerate.

gdbserver/server.cc

@@ -3610,7 +3610,7 @@ captured_main (int argc, char *argv[])
   int was_running;
   bool selftest = false;
 #if GDB_SELF_TEST
-  const char *selftest_filter = NULL;
+  std::vector<const char *> selftest_filters;
 #endif
 
   current_directory = getcwd (NULL, 0);
@@ -3747,8 +3747,16 @@ captured_main (int argc, char *argv[])
       else if (startswith (*next_arg, "--selftest="))
 	{
 	  selftest = true;
+
 #if GDB_SELF_TEST
-	  selftest_filter = *next_arg + strlen ("--selftest=");
+	  const char *filter = *next_arg + strlen ("--selftest=");
+	  if (*filter == '\0')
+	    {
+	      fprintf (stderr, _("Error: selftest filter is empty.\n"));
+	      exit (1);
+	    }
+
+	  selftest_filters.push_back (filter);
 #endif
 	}
       else
@@ -3825,7 +3833,7 @@ captured_main (int argc, char *argv[])
   if (selftest)
     {
 #if GDB_SELF_TEST
-      selftests::run_tests (selftest_filter);
+      selftests::run_tests (selftest_filters);
 #else
       printf (_("Selftests have been disabled for this build.\n"));
 #endif

gdbsupport/ChangeLog

@@ -1,3 +1,9 @@
+2020-08-13  Simon Marchi  <simon.marchi@polymtl.ca>
+
+	* selftest.h (run_tests): Change parameter to array_view.
+	* selftest.c (run_tests): Change parameter to array_view and use
+	it.
+
 2020-07-30  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
 
 	* Makefile.am (AM_CPPFLAGS): Add LARGEFILE_CPPFLAGS.

gdbsupport/selftest.cc

@@ -68,7 +68,7 @@ register_test (const std::string &name, self_test_function *function)
 /* See selftest.h.  */
 
 void
-run_tests (const char *filter)
+run_tests (gdb::array_view<const char *const> filters)
 {
   int ran = 0, failed = 0;
 
@@ -76,9 +76,20 @@ run_tests (const char *filter)
     {
       const std::string &name = pair.first;
       const std::unique_ptr<selftest> &test = pair.second;
+      bool run = false;
 
-      if (filter != NULL && *filter != '\0'
-	  && name.find (filter) == std::string::npos)
+      if (filters.empty ())
+	run = true;
+      else
+	{
+	  for (const char *filter : filters)
+	    {
+	      if (name.find (filter) != std::string::npos)
+		run = true;
+	    }
+	}
+
+      if (!run)
 	continue;
 
       try

gdbsupport/selftest.h

@@ -19,6 +19,8 @@
 #ifndef COMMON_SELFTEST_H
 #define COMMON_SELFTEST_H
 
+#include "gdbsupport/array-view.h"
+
 /* A test is just a function that does some checks and throws an
    exception if something has gone wrong.  */
 
@@ -47,10 +49,10 @@ extern void register_test (const std::string &name,
 /* Run all the self tests.  This print a message describing the number
    of test and the number of failures.
 
-   If FILTER is not NULL and not empty, only tests with names containing FILTER
-   will be ran.  */
+   If FILTERS is not empty, only run tests with names containing one of the
+   element of FILTERS.  */
 
-extern void run_tests (const char *filter);
+extern void run_tests (gdb::array_view<const char *const> filters);
 
 /* Reset GDB or GDBserver's internal state.  */
 extern void reset ();