io.c (rb_f_backquote): trade volatile for manual recycle

* io.c (rb_f_backquote): trade volatile for manual recycle
  rb_gc_force_recycle ensures object is visible until recycle

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44995 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,8 @@
+Sun Feb 16 12:46:47 2014  Eric Wong  <e@80x24.org>
+
+	* io.c (rb_f_backquote): trade volatile for manual recycle
+	  rb_gc_force_recycle ensures object is visible until recycle
+
 Sun Feb 16 11:55:14 2014  Eric Wong  <e@80x24.org>
 
 	* marshal.c (marshal_dump): use rb_gc_force_recycle for GC-safety

io.c

@@ -8227,7 +8227,7 @@ argf_readlines(int argc, VALUE *argv, VALUE argf)
 static VALUE
 rb_f_backquote(VALUE obj, VALUE str)
 {
-    volatile VALUE port;
+    VALUE port;
     VALUE result;
     rb_io_t *fptr;
 
@@ -8239,6 +8239,8 @@ rb_f_backquote(VALUE obj, VALUE str)
     GetOpenFile(port, fptr);
     result = read_all(fptr, remain_size(fptr), Qnil);
     rb_io_close(port);
+    rb_io_fptr_finalize(fptr);
+    rb_gc_force_recycle(port); /* also guards from premature GC */
 
     return result;
 }