https://github.com/gtrak/no.disassemble/
On Saturday, March 30, 2013 9:06:25 AM UTC-4, Gary Trakhman wrote:
>
> I made a little proof of concept last night. You could always look at
> bytecode that clojure emits in few ways, you can either hack the compiler
> yourself, or force AOT in your project and use javap. The first approach
> is a bit intrusive, and the second has a somewhat annoying turnaround time,
> and won't work for any code that calls eval at runtime.
>
> This takes another approach. It uses java's Instrumentation stuff, to
> provide a hook into all classloading past the point at which it's loaded,
> where I store off all the bytes of defined classes into a big
> ConcurrentHashMap. Then I use eclipse.jdt.core's disassembler
> functionality to print out the bytecode.
>
> There's a nice lein-plugin that adds the dependency to your project and
> looks itself up in order to add the appropriate -javaagent flag to your jvm
> startup options.
>
> Now you can do something like this:
>
> user=> (require 'no.disassemble)
> nil
>
> user=> (in-ns 'no.disassemble)
> #<Namespace no.disassemble>
>
> no.disassemble=> (println (disassemble (fn [])))
> // Compiled from NO_SOURCE_FILE (version 1.5 : 49.0, super bit)
> public final class no.disassemble$eval1174$fn__1175 extends
> clojure.lang.AFunction {
>
> // Method descriptor #7 ()V
> // Stack: 0, Locals: 0
> public static {};
> 0 return
> Line numbers:
> [pc: 0, line: 1]
>
> // Method descriptor #7 ()V
> // Stack: 1, Locals: 1
> public disassemble$eval1174$fn__1175();
> 0 aload_0
> 1 invokespecial clojure.lang.AFunction() [10]
> 4 return
> Line numbers:
> [pc: 0, line: 1]
>
> // Method descriptor #12 ()Ljava/lang/Object;
> // Stack: 1, Locals: 1
> public java.lang.Object invoke();
> 0 aconst_null
> 1 areturn
> Line numbers:
> [pc: 0, line: 1]
> Local variable table:
> [pc: 0, pc: 1] local: this index: 0 type: java.lang.Object
>
> }
> nil
> no.disassemble=>
>
>
> Potential use cases:
>
> Writing fast code faster.
> Proving to newbies that clojure is not interpreted, further evidence of
> eval's coolness.
> Checking to make sure primitives are being used where you expect.
>
>
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