ko1	2018-06-18 16:41:22 +0900 (Mon, 18 Jun 2018)

  New Revision: 63687

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=63687

  Log:
    hidden objects should not be pushed.
    
    * vm_insnhelper.h (PUSH): hidden objects (klass == 0) should not be pushed
      to a VM value stack. Add assertion for it.

  Modified files:
    trunk/vm_insnhelper.h
Index: vm_insnhelper.h
===================================================================
--- vm_insnhelper.h	(revision 63686)
+++ vm_insnhelper.h	(revision 63687)
@@ -36,7 +36,18 @@ RUBY_SYMBOL_EXPORT_END https://github.com/ruby/ruby/blob/trunk/vm_insnhelper.h#L36
 /* deal with stack                                        */
 /**********************************************************/
 
-#define PUSH(x) (SET_SV(x), INC_SP(1))
+static inline int
+rb_obj_hidden_p(VALUE obj)
+{
+    if (SPECIAL_CONST_P(obj)) {
+        return FALSE;
+    }
+    else {
+        return RBASIC_CLASS(obj) ? FALSE : TRUE;
+    }
+}
+
+#define PUSH(x) (VM_ASSERT(!rb_obj_hidden_p(x)), SET_SV(x), INC_SP(1))
 #define TOPN(n) (*(GET_SP()-(n)-1))
 #define POPN(n) (DEC_SP(n))
 #define POP()   (DEC_SP(1))

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