clojure - 如果在运行时替换函数，Clojure/JVM 是否会 GC 旧代码？

Question

如果您经常在运行时替换函数，the way this poster wanted to do为了genetic-programming的目的, Clojure/JVM GC 旧代码吗？

Answer 1

如有疑问，请询问计算机!我写了一个快速测试:

(ns tst.demo.core
  (:use demo.core tupelo.core tupelo.test))
  
(defn create-fn
  [n]
  (let [fname   (symbol (format "add-%d" n))
        body    (vector '[x] (list '+ n 'x))
        fn-form (apply list 'clojure.core/defn fname body)
        fn-ref  (eval fn-form)]
    fn-ref))

(defn create-and-call-fn
  [n]
  (let [fn-ref (create-fn n)
        fn-result (fn-ref 3)]
    (when-not (= (+ 3 n) fn-result)
      (throw (ex-info "bad result" (vals->map n fn-result))))))


(dotest
  (let [f5 (create-fn 5)
        f5-result (f5 3)]
    (is= 8 f5-result))
  (dotimes [i 99999]
    (when (zero? (mod i 100)) (spyx i))
    (create-and-call-fn i)))

在创建多达 10 万个函数后，它仍然有效。 YMMV!

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以上是根据this template project .