package piotrk.example.asm;

import java.io.IOException;

import org.objectweb.asm.ClassReader;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.commons.EmptyVisitor;

/**
 * This is a simple example showing how to retrieve Local Variable
Table (LVT)
 * information (including method parameter names) from a class file using
 * <em>ObjectWeb ASM 2.1</em>.
 * <p>
 * <b>Important:</b> To see expected results this should be compiled with
 * <em>-g:vars</em> option.
 *
 * @author piotrk
 */
public class ShowLVT {

    public static void main(String[] args) throws IOException {

        String className = ShowLVT.class.getName();

        new ClassReader(className)
                .accept(new EmptyVisitor() {

            @Override
            public MethodVisitor visitMethod(int access, String name,
                    String desc, String signature, String[] exceptions) {
                System.out.println("method name=" + name + ", desc=" +
desc);
                return this;
            }

            @Override
            public void visitLocalVariable(String name, String desc,
                    String signature, Label start, Label end, int index) {
                System.out.println("local name=" + name + ", desc=" + desc
                        + ", index=" + index);
            }

        }, false);

    }
}