Examples of org.deuce.objectweb.asm.util.ASMifierClassVisitor

• org.deuce.objectweb.asm.util.ASMifierClassVisitor
  A {@link ClassVisitor} that prints the ASM code that generates the classes itvisits. This class visitor can be used to quickly write ASM code to generate some given bytecode:

  • write the Java source code equivalent to the bytecode you want to generate;
  • compile it with javac;
  • make a {@link ASMifierClassVisitor} visit this compiled class (see the{@link #main main} method);
  • edit the generated source code, ifnecessary.

  The source code printed when visiting the Hello class is the following:

   import org.deuce.objectweb.asm.*; public class HelloDump implements Opcodes { public static byte[] dump() throws Exception { ClassWriter cw = new ClassWriter(0); FieldVisitor fv; MethodVisitor mv; AnnotationVisitor av0; cw.visit(49, ACC_PUBLIC + ACC_SUPER, "Hello", null, "java/lang/Object", null); cw.visitSource("Hello.java", null); { mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null); mv.visitVarInsn(ALOAD, 0); mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V"); mv.visitInsn(RETURN); mv.visitMaxs(1, 1); mv.visitEnd(); } { mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "main", "([Ljava/lang/String;)V", null, null); mv.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;"); mv.visitLdcInsn("hello"); mv.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V"); mv.visitInsn(RETURN); mv.visitMaxs(2, 1); mv.visitEnd(); } cw.visitEnd(); return cw.toByteArray(); } } 

  where Hello is defined by:

   public class Hello { public static void main(String[] args) { System.out.println("hello"); } } 

  @author Eric Bruneton @author Eugene Kuleshov

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