do not disable `trace_` prefix insns.

* vm.c: introduce `ruby_vm_event_enabled_flags` which represents which
  event flags are enabled before.

* vm_trace.c: do not turn off `trace_` prefix instructions because turn on
  overhead is a matter if a program repeats turn on and turn off frequently.

* iseq.c (finish_iseq_build): respect `ruby_vm_event_enabled_flags`.

* vm_insnhelper.c (vm_trace): check `ruby_vm_event_flags` and disable
  lazy trace-off technique (do not disable traces).


git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61122 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 2 deletions

diff --git a/iseq.c b/iseq.c
index 998639eafc..f8fb90e7a9 100644
--- a/iseq.c
+++ b/iseq.c
@@ -361,8 +361,8 @@ finish_iseq_build(rb_iseq_t *iseq)
     }
 
     iseq->aux.trace_events = 0;
-    if (ruby_vm_event_flags & ISEQ_TRACE_EVENTS) {
-	rb_iseq_trace_set(iseq, ruby_vm_event_flags & ISEQ_TRACE_EVENTS);
+    if (ruby_vm_event_enabled_flags & ISEQ_TRACE_EVENTS) {
+	rb_iseq_trace_set(iseq, ruby_vm_event_enabled_flags & ISEQ_TRACE_EVENTS);
     }
     return Qtrue;
 }