Expensive selftests: torture testing for fix-it boundary conditions (PR c/82050)

This patch adds selftest coverage for the fix for PR c/82050.

The selftest iterates over various "interesting" column and line-width
values to try to shake out bugs in the fix-it printing routines, a kind
of "torture" selftest.

Unfortunately this selftest is noticably slower than the other selftests;
adding it to diagnostic-show-locus.c led to:
  -fself-test: 40218 pass(es) in 0.172000 seconds
slowing down to:
  -fself-test: 97315 pass(es) in 6.109000 seconds
for an unoptimized build (e.g. when hacking with --disable-bootstrap).

Given that this affects the compile-edit-test cycle of the "gcc"
subdirectory, this felt like an unacceptable amount of overhead to add.

I attempted to optimize the test by reducing the amount of coverage, but
the test seems useful, and there seems to be a valid role for "torture"
selftests.

Hence this patch adds a:
  gcc.dg/plugin/expensive_selftests_plugin.c
with the responsibility for running "expensive" selftests, and adds the
expensive test there.  The patch moves a small amount of code from
selftest::run_tests into a helper class so that the plugin can print
a useful summary line (to reassure us that the tests are actually being
run).

With that, the compile-edit-test cycle of the "gcc" subdir is unaffected;
the plugin takes:
  expensive_selftests_plugin: 26641 pass(es) in 3.127000 seconds
which seems reasonable within the much longer time taken by "make check"
(I optimized some of the overhead away, hence the reduction from 6 seconds
above down to 3 seconds).

gcc/ChangeLog:
	PR c/82050
	* selftest-run-tests.c (selftest::run_tests): Move start/finish code
	to...
	* selftest.c (selftest::test_runner::test_runner): New ctor.
	(selftest::test_runner::~test_runner): New dtor.
	* selftest.h (class selftest::test_runner): New class.

gcc/testsuite/ChangeLog:
	PR c/82050
	* gcc.dg/plugin/expensive-selftests-1.c: New file.
	* gcc.dg/plugin/expensive_selftests_plugin.c: New file.
	* gcc.dg/plugin/plugin.exp (plugin_test_list): Add the above.

From-SVN: r255563

1 files changed, 14 insertions, 0 deletions

diff --git a/gcc/selftest.h b/gcc/selftest.h
index dbb246b..68b2e8e 100644
--- a/gcc/selftest.h
+++ b/gcc/selftest.h
@@ -168,6 +168,20 @@ extern char *locate_file (const char *path);
 
 extern const char *path_to_selftest_files;
 
+/* selftest::test_runner is an implementation detail of selftest::run_tests,
+   exposed here to allow plugins to run their own suites of tests.  */
+
+class test_runner
+{
+ public:
+  test_runner (const char *name);
+  ~test_runner ();
+
+ private:
+  const char *m_name;
+  long m_start_time;
+};
+
 /* Declarations for specific families of tests (by source file), in
    alphabetical order.  */
 extern void attribute_c_tests ();