tests/org.simantics.scl.compiler.tests/src/org/simantics/scl/compiler/tests/experimentation/RecursiveInitialization.java

   1 package org.simantics.scl.compiler.tests.experimentation;\r
   2 \r
   3 import java.io.PrintWriter;\r
   4 import java.lang.reflect.Method;\r
   5 import java.util.concurrent.atomic.AtomicReference;\r
   6 \r
   7 import org.objectweb.asm.ClassVisitor;\r
   8 import org.objectweb.asm.ClassWriter;\r
   9 import org.objectweb.asm.MethodVisitor;\r
  10 import org.objectweb.asm.Opcodes;\r
  11 import org.objectweb.asm.util.TraceClassVisitor;\r
  12 \r
  13 public class RecursiveInitialization {\r
  14 \r
  15     public static void main(String[] args) throws Exception {\r
  16         ClassWriter classWriter = new ClassWriter(ClassWriter.COMPUTE_MAXS);\r
  17         ClassVisitor classVisitor = new TraceClassVisitor(classWriter, new PrintWriter(System.out));\r
  18         classVisitor.visit(Opcodes.V1_5, Opcodes.ACC_PUBLIC, "test/Test", null, "java/lang/Object", new String[0]);\r
  19         MethodVisitor methodWriter = classVisitor.visitMethod(\r
  20                 Opcodes.ACC_PUBLIC | Opcodes.ACC_STATIC,\r
  21                 "main", "()Ljava/lang/Object;", null, null);\r
  22         \r
  23         methodWriter.visitCode();        \r
  24         methodWriter.visitTypeInsn(Opcodes.NEW, "java/util/concurrent/atomic/AtomicReference");\r
  25         methodWriter.visitVarInsn(Opcodes.ASTORE, 2);\r
  26 \r
  27         methodWriter.visitTypeInsn(Opcodes.NEW, "java/util/concurrent/atomic/AtomicReference");\r
  28         methodWriter.visitVarInsn(Opcodes.ASTORE, 1);\r
  29         \r
  30         methodWriter.visitVarInsn(Opcodes.ALOAD, 2);\r
  31         methodWriter.visitVarInsn(Opcodes.ALOAD, 1);\r
  32         //methodWriter.visitInsn(Opcodes.ACONST_NULL);\r
  33         methodWriter.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/util/concurrent/atomic/AtomicReference", "<init>", "(Ljava/lang/Object;)V", false);\r
  34         \r
  35         methodWriter.visitVarInsn(Opcodes.ALOAD, 1);\r
  36         methodWriter.visitVarInsn(Opcodes.ALOAD, 2);\r
  37         methodWriter.visitMethodInsn(Opcodes.INVOKESPECIAL, "java/util/concurrent/atomic/AtomicReference", "<init>", "(Ljava/lang/Object;)V", false);\r
  38 \r
  39         methodWriter.visitVarInsn(Opcodes.ALOAD, 2);\r
  40         methodWriter.visitInsn(Opcodes.ARETURN);\r
  41         methodWriter.visitMaxs(0, 0);\r
  42         methodWriter.visitEnd();\r
  43         \r
  44         byte[] bytes = classWriter.toByteArray();\r
  45         ClassLoader classLoader = new ClassLoader() {\r
  46             @Override\r
  47             protected Class<?> findClass(String name) throws ClassNotFoundException {\r
  48                 if(!name.equals("test.Test"))\r
  49                     throw new ClassNotFoundException();\r
  50                 return defineClass("test.Test", bytes, 0, bytes.length);\r
  51             }\r
  52         };\r
  53         Class<?> clazz = classLoader.loadClass("test.Test");\r
  54         Method method = clazz.getMethod("main");\r
  55         AtomicReference<Object> result = (AtomicReference<Object>)method.invoke(null);\r
  56         System.out.println(result.hashCode());\r
  57         //System.out.println(result.get().hashCode());\r
  58     }\r
  59     \r
  60 }\r