ext/coverage/: add the oneshot mode

This patch introduces "oneshot_lines" mode for `Coverage.start`, which
checks "whether each line was executed at least once or not", instead of
"how many times each line was executed".  A hook for each line is fired
at most once, and after it is fired, the hook flag was removed; it runs
with zero overhead.

See [Feature #15022] in detail.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65195 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 0 deletions

diff --git a/vm_core.h b/vm_core.h
index 7b795bb5cb..444303173f 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -1837,6 +1837,7 @@ int rb_thread_check_trap_pending(void);
 
 extern VALUE rb_get_coverages(void);
 extern void rb_set_coverages(VALUE, int, VALUE);
+extern void rb_clear_coverages(void);
 extern void rb_reset_coverages(void);
 
 void rb_postponed_job_flush(rb_vm_t *vm);