limit exponent on number of calls made by _methods for unions

JuliaLang · Feb 25, 2016 · ee0c3ed · vtjnash · Feb 25, 2016 · ee0c3ed
1 parent e83862f
commit ee0c3ed
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/base/reflection.jl b/base/reflection.jl
@@ -188,11 +188,15 @@ function _methods(f::ANY,t::ANY,lim)
 end
 function _methods_by_ftype(t::ANY, lim)
     tp = t.parameters
+    nunions = 0
     for ti in tp
         if isa(ti, Union)
-            return _methods(Any[tp...], length(tp), lim, [])
+            nunions += 1
         end
     end
+    if 1 <= nunions <= 6
+        return _methods(Any[tp...], length(tp), lim, [])
+    end
     return ccall(:jl_matching_methods, Any, (Any,Int32), t, lim)
 end
 function _methods(t::Array,i,lim::Integer,matching::Array{Any,1})