compar.c: fail if recursion

* compar.c (cmp_eq): fail if recursion.  [ruby-core:57736] [Bug #9003]
* thread.c (rb_exec_recursive_paired_outer): new function which is
  combinnation of paired and outer variants.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43208 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 12 insertions, 0 deletions

diff --git a/thread.c b/thread.c
index 463f5d3b0e..4789dfa0e8 100644
--- a/thread.c
+++ b/thread.c
@@ -4954,6 +4954,18 @@ rb_exec_recursive_outer(VALUE (*func) (VALUE, VALUE, int), VALUE obj, VALUE arg)
 }
 
 /*
+ * If recursion is detected on the current method, obj and paired_obj,
+ * the outermost func will be called with (obj, arg, Qtrue). All inner
+ * func will be short-circuited using throw.
+ */
+
+VALUE
+rb_exec_recursive_paired_outer(VALUE (*func) (VALUE, VALUE, int), VALUE obj, VALUE paired_obj, VALUE arg)
+{
+    return exec_recursive(func, obj, rb_obj_id(paired_obj), arg, 1);
+}
+
+/*
  *  call-seq:
  *     thread.backtrace    -> array
  *