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(ns lang.asm
(:import (org.objectweb.asm Opcodes
ClassWriter
MethodVisitor)))
(defn write-file [file data]
(with-open [stream (java.io.BufferedOutputStream. (java.io.FileOutputStream. file))]
(.write stream data)))
(comment
(let [class-data (let [cw (doto (new ClassWriter ClassWriter/COMPUTE_MAXS)
(.visit Opcodes/V1_5 (+ Opcodes/ACC_PUBLIC Opcodes/ACC_SUPER)
"hello_world" nil "java/lang/Object" nil))]
(doto (.visitMethod cw Opcodes/ACC_PUBLIC "<init>" "()V" nil nil)
(.visitCode)
(.visitVarInsn Opcodes/ALOAD 0)
(.visitMethodInsn Opcodes/INVOKESPECIAL "java/lang/Object" "<init>" "()V")
(.visitInsn Opcodes/RETURN)
(.visitMaxs 0 0)
(.visitEnd))
(doto (.visitMethod cw (+ Opcodes/ACC_PUBLIC Opcodes/ACC_STATIC) "main" "([Ljava/lang/String;)V" nil nil)
(.visitCode)
(.visitFieldInsn Opcodes/GETSTATIC "java/lang/System" "out" "Ljava/io/PrintStream;")
(.visitLdcInsn "Hello, World!")
(.visitMethodInsn Opcodes/INVOKEVIRTUAL "java/io/PrintStream" "println" "(Ljava/lang/String;)V")
(.visitInsn Opcodes/RETURN)
(.visitMaxs 0 0)
(.visitEnd))
(.visitEnd cw)
(.toByteArray cw))]
(write-file "hello_world.class" class-data))
)
;; package asm;
;; public class HelloWorld {
;; public static void main(String[] args) {
;; System.out.println("Hello, World!");
;; }
;; }
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