Ah, I found out that java bytecode can't contain data literals so the
compiler has to emit a constructor instead.
Also, since the jvm doesn't gc classes there might be confusing memory
leaks if you could embed a closure in evaluated code.
On 9 August 2013 09:13, Christophe Grand <christo...@cgrand.net> wrote:
> You are right, it's beacsue of print-dup. Hence it works only on functions
> which aren't closures:
>
> => (let [a nil x (fn [] a)] (eval [x]))
> IllegalArgumentException No matching ctor found for class
> user$eval3989$x__3990
>
>
> Why is emitValue used?
> Regular code forms (as returned by the reader) don't usually contain
> functions. When the compiler doesn't know how to evaluate some value it
> treats it as a constant. Constants are serialized in the class and read
> back/instanciated when the class is loaded.
>
>
> On Thu, Aug 8, 2013 at 6:30 PM, Jamie Brandon <ja...@scattered-thoughts.net>
> wrote:
>>
>> The Fn case works because print-dup is defined on fns:
>>
>> user=> (binding [*print-dup* true] (println (fn [] nil)))
>> #=(user$eval2502$fn__2503. )
>> nil
>> user=> (read-string "#=(user$eval2502$fn__2503. )")
>> #<user$eval2502$fn__2503 user$eval2502$fn__2503@19037d90>
>>
>> I still can't figure out why Compiler.emitValue is used though. Am I
>> right in thinking that clojure.core/eval is not calling the function
>> that the compiler uses, but instead serializing everything and pushing
>> it through the same pathway as compiling text files?
>>
>> On 8 August 2013 16:43, Christophe Grand <christo...@cgrand.net> wrote:
>> > Right now I ca't figure why the fn case is working but the anonyous Var
>> > is
>> > failing because the vars are specially handled:
>> >
>> > else if(value instanceof Var)
>> > {
>> > Var var = (Var) value;
>> > gen.push(var.ns.name.toString());
>> > gen.push(var.sym.toString());
>> > gen.invokeStatic(RT_TYPE, Method.getMethod("clojure.lang.Var
>> > var(String,String)"));
>> > }
>> >
>> > Christophe
>> >
>> >
>> >
>> > On Thu, Aug 8, 2013 at 4:44 PM, Jamie Brandon
>> > <ja...@scattered-thoughts.net>
>> > wrote:
>> >>
>> >> What if it isn't inside a constant?
>> >>
>> >> user=> (eval `(fn [] ~#'x))
>> >> #<user$eval1366$fn__1367 user$eval1366$fn__1367@15dbb76>
>> >>
>> >> user=> (with-local-vars [x nil] (eval `(fn [] ~x)))
>> >> CompilerException java.lang.NullPointerException,
>> >> compiling:(NO_SOURCE_PATH:1:1)
>> >>
>> >> How about functions? These are unreadable but they still eval
>> >> correctly inside constants.
>> >>
>> >> user=> (letfn [(x [] nil)] (eval x))
>> >> #<user$eval1377$x__1378 user$eval1377$x__1378@5fea6729>
>> >>
>> >> user=> (letfn [(x [] nil)] (eval [x]))
>> >> [#<user$eval1381$x__1382 user$eval1381$x__1382@e3b7c27>]
>> >>
>> >> user=> (read-string "#<user$x user$x@1981e4d>")
>> >> RuntimeException Unreadable form clojure.lang.Util.runtimeException
>> >> (Util.java:219)
>> >>
>> >> user=> (defn x [] nil)
>> >> #'user/x
>> >>
>> >> user=> (eval x)
>> >> #<user$x user$x@14ff1714>
>> >>
>> >> user=> (eval [x])
>> >> [#<user$x user$x@5892d4a8>]
>> >>
>> >> user=> (read-string "#<user$eval1381$x__1382
>> >> user$eval1381$x__1382@e3b7c27>")
>> >> RuntimeException Unreadable form clojure.lang.Util.runtimeException
>> >> (Util.java:219)
>> >>
>> >> On 8 August 2013 14:58, Christophe Grand <christo...@cgrand.net> wrote:
>> >> > The error is caused by the fact that eval sees the var as a constant
>> >> > (or
>> >> > part of) and tries to serialize the constant.
>> >> > #<Var: --unnamed--> is unreadable while #'user/x is that explains teh
>> >> > difference in behaviour.
>> >> >
>> >> >
>> >> > On Thu, Aug 8, 2013 at 3:40 PM, Jamie Brandon
>> >> > <ja...@scattered-thoughts.net>
>> >> > wrote:
>> >> >>
>> >> >> This has me stumped:
>> >> >>
>> >> >> user=> (with-local-vars [x nil] (eval x))
>> >> >> #<Var: --unnamed-->
>> >> >> user=> (with-local-vars [x nil] (eval [x]))
>> >> >> CompilerException java.lang.NullPointerException,
>> >> >> compiling:(NO_SOURCE_PATH:1:1)
>> >> >>
>> >> >> By comparison:
>> >> >>
>> >> >> user=> (def x nil)
>> >> >> #'user/x
>> >> >> user=> (eval #'x)
>> >> >> #'user/x
>> >> >> user=> (eval [#'x])
>> >> >> [#'user/x]
>> >> >>
>> >> >> --
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>> >> >
>> >> >
>> >> >
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