check interrupts at each frame pop timing.

Asynchronous events such as signal trap, finalization timing,
thread switching and so on are managed by "interrupt_flag".
Ruby's threads check this flag periodically and if a thread
does not check this flag, above events doesn't happen.

This checking is CHECK_INTS() (related) macro and it is placed
at some places (laeve instruction and so on). However, at the end
of C methods, C blocks (IMEMO_IFUNC) etc there are no checking
and it can introduce uninterruptible thread.

To modify this situation, we decide to place CHECK_INTS() at
vm_pop_frame(). It increases interrupt checking points.
[Bug #16366]

This patch can introduce unexpected events...

1 files changed, 0 insertions, 3 deletions

diff --git a/insns.def b/insns.def
index 39b05543eb..9bad6768f0 100644
--- a/insns.def
+++ b/insns.def
@@ -935,8 +935,6 @@ leave
 	}
     }
 
-    RUBY_VM_CHECK_INTS(ec);
-
     if (vm_pop_frame(ec, GET_CFP(), GET_EP())) {
 #if OPT_CALL_THREADED_CODE
 	rb_ec_thread_ptr(ec)->retval = val;
@@ -963,7 +961,6 @@ throw
 /* Same discussion as leave. */
 // attr bool leaf = false; /* has rb_threadptr_execute_interrupts() */
 {
-    RUBY_VM_CHECK_INTS(ec);
     val = vm_throw(ec, GET_CFP(), throw_state, throwobj);
     THROW_EXCEPTION(val);
     /* unreachable */