tests/org.simantics.scl.compiler.tests/src/org/simantics/scl/compiler/tests/FindAllowedChars.java

   1 package org.simantics.scl.compiler.tests;
   2
   3 import java.lang.reflect.Method;
   4
   5 import org.objectweb.asm.ClassWriter;
   6 import org.objectweb.asm.MethodVisitor;
   7 import org.objectweb.asm.Opcodes;
   8
   9 public class FindAllowedChars {
  10     public static class MyClassLoader extends ClassLoader {
  11         final String className;
  12         final byte[] classBytes;
  13
  14         public MyClassLoader(ClassLoader parent, String className, byte[] classBytes) {
  15             super(parent);
  16             this.className = className;
  17             this.classBytes = classBytes;
  18         }
  19
  20         public MyClassLoader(String className, byte[] classBytes) {
  21             this.className = className;
  22             this.classBytes = classBytes;
  23         }
  24
  25         @Override
  26         protected Class<?> findClass(String name) throws ClassNotFoundException {
  27             if(name.equals(name))
  28                 return defineClass(name, classBytes, 0, classBytes.length);
  29             else
  30                 return super.findClass(name);
  31         }
  32     }
  33
  34     public static void test(String className, String methodName) throws Exception {
  35         ClassWriter classWriter = new ClassWriter(ClassWriter.COMPUTE_MAXS);
  36         classWriter.visit(Opcodes.V1_5, Opcodes.ACC_PUBLIC, className, null, "java/lang/Object", null);
  37
  38         MethodVisitor methodVisitor = classWriter.visitMethod(Opcodes.ACC_PUBLIC | Opcodes.ACC_STATIC, methodName, "()V", null, null);
  39         /*methodVisitor.visitFieldInsn(Opcodes.GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
  40         methodVisitor.visitLdcInsn("Hello world!");
  41         methodVisitor.visitMethodInsn(Opcodes.INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V", false);*/
  42         methodVisitor.visitInsn(Opcodes.RETURN);
  43         methodVisitor.visitMaxs(0, 0);
  44         methodVisitor.visitEnd();
  45         classWriter.visitEnd();
  46
  47         ClassLoader loader = new MyClassLoader(className, classWriter.toByteArray());
  48         Class<?> clazz = loader.loadClass(className);
  49         Method method = clazz.getMethod(methodName);
  50         method.invoke(null);
  51     }
  52
  53     public static void main(String[] args) throws Exception {
  54         for(int a=Character.MIN_VALUE;a<Character.MAX_VALUE;++a) {
  55             //for(char b=0;b<256;++b) {
  56                 String name = new String(new char[] {(char)a});
  57                 try {
  58                     test(name, "test");
  59                 } catch(Throwable e) {
  60                     System.out.println(name + " (" + a + ")");
  61                 }
  62             //}
  63         }
  64         System.out.println((int)Character.MAX_VALUE);
  65     }
  66 }