* insnhelper.h, vm.h: some refactoring.

  remove useless comments, etc.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@12674 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 6 insertions, 0 deletions

diff --git a/vm.h b/vm.h
index b1c543eb9c..855efeae06 100644
--- a/vm.h
+++ b/vm.h
@@ -220,6 +220,12 @@ default:                        \
   ((rb_control_frame_t *)(th->stack + th->stack_size) - (rb_control_frame_t *)(cfp))
 #define VM_SP_CNT(th, sp) ((sp) - (th)->stack)
 
+#define CHECK_STACK_OVERFLOW(cfp, margin) do \
+  if (((VALUE *)(cfp)->sp) + (margin) >= ((VALUE *)cfp)) { \
+      rb_exc_raise(sysstack_error); \
+  } \
+while (0)
+
 /*
   env{
     env[0] // special (block or prev env)