* cont.c (fiber_init): initialize control frame correctly.

This fix does not affect any ordinal execution, but
  affects debug prints.



git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@51165 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,9 @@
+Tue Jul  7 01:52:14 2015  Koichi Sasada  <ko1@atdot.net>
+
+	* cont.c (fiber_init): initialize control frame correctly.
+	  This fix does not affect any ordinal execution, but
+	  affects debug prints.
+
 Mon Jul  6 17:59:05 2015  Koichi Sasada  <ko1@atdot.net>
 
 	* vm_insnhelper.c (vm_search_super_method): do not skip calling

cont.c

@@ -1196,14 +1196,15 @@ fiber_init(VALUE fibval, VALUE proc)
     th->cfp = (void *)(th->stack + th->stack_size);
     th->cfp--;
     th->cfp->pc = 0;
-    th->cfp->sp = th->stack + 1;
+    th->cfp->sp = th->stack + 2;
 #if VM_DEBUG_BP_CHECK
     th->cfp->bp_check = 0;
 #endif
-    th->cfp->ep = th->stack;
-    *th->cfp->ep = VM_ENVVAL_BLOCK_PTR(0);
+    th->cfp->ep = th->stack + 1;
+    th->cfp->ep[ 0] = VM_ENVVAL_BLOCK_PTR(0);
+    th->cfp->ep[-1] = 0;
     th->cfp->self = Qnil;
-    th->cfp->flag = 0;
+    th->cfp->flag = VM_FRAME_MAGIC_DUMMY | VM_FRAME_FLAG_FINISH;
     th->cfp->iseq = 0;
     th->cfp->proc = 0;
     th->cfp->block_iseq = 0;