Hi all,
I was curious to know if it is at all possible to determine how many times
a function has been recursively called by inspecting the callstack.
Given this code snippet:
(defn ignored? [classname]
(let [ignored #{"callers" "dbg" "clojure.lang" "swank" "nrepl" "eval"}]
(some #(re-find (re-pattern %) classname) ignored)))
(defn callstack []
(let [fns (map #(str (.getClassName %))
(-> (Throwable.) .fillInStackTrace .getStackTrace))]
(vec (doall (remove ignored? fns)))))
(defn random-depth []
(pprint (callstack))
(if (> (Math/random) 0.5)
(recur)))
I get the following output:
["user$callstack"
"user$random_depth"
"clojure.main$repl$fn__7108"
"clojure.main$repl"
"clojure.core$apply"
"clojure.core$with_bindings_STAR_"
"java.util.concurrent.ThreadPoolExecutor"
"java.util.concurrent.ThreadPoolExecutor$Worker"
"java.lang.Thread"]
["user$callstack"
"user$random_depth"
"clojure.main$repl$fn__7108"
"clojure.main$repl"
"clojure.core$apply"
"clojure.core$with_bindings_STAR_"
"java.util.concurrent.ThreadPoolExecutor"
"java.util.concurrent.ThreadPoolExecutor$Worker"
"java.lang.Thread"]
I would like to get a different stack on each iteration, but given that the
whole point of recur is not to consume the stack while looping, I
understand why this method would not work.
Is there any other data that I could use to either get or approximate this
information?
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