Semicompiled

package com.zarbosoft.semicompiled;

import java.lang.RuntimeException;

class Main {
  public static void myMain() {
    throw new RuntimeException("Hello");
  }
}

Classfile /tmp/semicompiled-ZmOCKIjw-18191201201337465232/com/zarbosoft/semicompiled/Main.class
  Last modified Jun 2, 2024; size 268 bytes
  MD5 checksum b626b19988d0fc3ca142ee275386d945
class com.zarbosoft.semicompiled.Main
  minor version: 0
  major version: 52
  flags: (0x0020) ACC_SUPER
  this_class: #5                          // com/zarbosoft/semicompiled/Main
  super_class: #6                         // java/lang/Object
  interfaces: 0, fields: 0, methods: 2, attributes: 0
Constant pool:
   #1 = Methodref          #6.#11         // java/lang/Object."<init>":()V
   #2 = Class              #12            // java/lang/RuntimeException
   #3 = String             #13            // Hello
   #4 = Methodref          #2.#14         // java/lang/RuntimeException."<init>":(Ljava/lang/String;)V
   #5 = Class              #15            // com/zarbosoft/semicompiled/Main
   #6 = Class              #16            // java/lang/Object
   #7 = Utf8               <init>
   #8 = Utf8               ()V
   #9 = Utf8               Code
  #10 = Utf8               myMain
  #11 = NameAndType        #7:#8          // "<init>":()V
  #12 = Utf8               java/lang/RuntimeException
  #13 = Utf8               Hello
  #14 = NameAndType        #7:#17         // "<init>":(Ljava/lang/String;)V
  #15 = Utf8               com/zarbosoft/semicompiled/Main
  #16 = Utf8               java/lang/Object
  #17 = Utf8               (Ljava/lang/String;)V
{
  com.zarbosoft.semicompiled.Main();
    descriptor: ()V
    flags: (0x0000)
    Code:
      stack=1, locals=1, args_size=1
         0: aload_0
         1: invokespecial #1                  // Method java/lang/Object."<init>":()V
         4: return

  public static void myMain();
    descriptor: ()V
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=0, args_size=0
         0: new           #2                  // class java/lang/RuntimeException
         3: dup
         4: ldc           #3                  // String Hello
         6: invokespecial #4                  // Method java/lang/RuntimeException."<init>":(Ljava/lang/String;)V
         9: athrow
}

package asm.com.zarbosoft.semicompiled;

import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.Attribute;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.ConstantDynamic;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.Handle;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.RecordComponentVisitor;
import org.objectweb.asm.Type;
import org.objectweb.asm.TypePath;

public class MainDump implements Opcodes {

  public static byte[] dump() throws Exception {

    ClassWriter classWriter = new ClassWriter(0);
    FieldVisitor fieldVisitor;
    RecordComponentVisitor recordComponentVisitor;
    MethodVisitor methodVisitor;
    AnnotationVisitor annotationVisitor0;

    classWriter.visit(
        V1_8, ACC_SUPER, "com/zarbosoft/semicompiled/Main", null, "java/lang/Object", null);

    {
      methodVisitor = classWriter.visitMethod(0, "<init>", "()V", null, null);
      methodVisitor.visitCode();
      methodVisitor.visitVarInsn(ALOAD, 0);
      methodVisitor.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
      methodVisitor.visitInsn(RETURN);
      methodVisitor.visitMaxs(1, 1);
      methodVisitor.visitEnd();
    }
    {
      methodVisitor = classWriter.visitMethod(ACC_PUBLIC | ACC_STATIC, "myMain", "()V", null, null);
      methodVisitor.visitCode();
      methodVisitor.visitTypeInsn(NEW, "java/lang/RuntimeException");
      methodVisitor.visitInsn(DUP);
      methodVisitor.visitLdcInsn("Hello");
      methodVisitor.visitMethodInsn(
          INVOKESPECIAL, "java/lang/RuntimeException", "<init>", "(Ljava/lang/String;)V", false);
      methodVisitor.visitInsn(ATHROW);
      methodVisitor.visitMaxs(3, 0);
      methodVisitor.visitEnd();
    }
    classWriter.visitEnd();

    return classWriter.toByteArray();
  }
}

Classfile /tmp/semicompiled-ZmOCKIjw-18191201201337465232/com/zarbosoft/semicompiled/Main.class
  Last modified Jun 2, 2024; size 425 bytes
  MD5 checksum 4e52bdc454ffac81d9db9ffa32e4a1f5
  Compiled from "Main.java"
class com.zarbosoft.semicompiled.Main
  minor version: 0
  major version: 52
  flags: (0x0020) ACC_SUPER
  this_class: #5                          // com/zarbosoft/semicompiled/Main
  super_class: #6                         // java/lang/Object
  interfaces: 0, fields: 0, methods: 2, attributes: 1
Constant pool:
   #1 = Methodref          #6.#17         // java/lang/Object."<init>":()V
   #2 = Class              #18            // java/lang/RuntimeException
   #3 = String             #19            // Hello
   #4 = Methodref          #2.#20         // java/lang/RuntimeException."<init>":(Ljava/lang/String;)V
   #5 = Class              #21            // com/zarbosoft/semicompiled/Main
   #6 = Class              #22            // java/lang/Object
   #7 = Utf8               <init>
   #8 = Utf8               ()V
   #9 = Utf8               Code
  #10 = Utf8               LineNumberTable
  #11 = Utf8               LocalVariableTable
  #12 = Utf8               this
  #13 = Utf8               Lcom/zarbosoft/semicompiled/Main;
  #14 = Utf8               myMain
  #15 = Utf8               SourceFile
  #16 = Utf8               Main.java
  #17 = NameAndType        #7:#8          // "<init>":()V
  #18 = Utf8               java/lang/RuntimeException
  #19 = Utf8               Hello
  #20 = NameAndType        #7:#23         // "<init>":(Ljava/lang/String;)V
  #21 = Utf8               com/zarbosoft/semicompiled/Main
  #22 = Utf8               java/lang/Object
  #23 = Utf8               (Ljava/lang/String;)V
{
  com.zarbosoft.semicompiled.Main();
    descriptor: ()V
    flags: (0x0000)
    Code:
      stack=1, locals=1, args_size=1
         0: aload_0
         1: invokespecial #1                  // Method java/lang/Object."<init>":()V
         4: return
      LineNumberTable:
        line 5: 0
      LocalVariableTable:
        Start  Length  Slot  Name   Signature
            0       5     0  this   Lcom/zarbosoft/semicompiled/Main;

  public static void myMain();
    descriptor: ()V
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=3, locals=0, args_size=0
         0: new           #2                  // class java/lang/RuntimeException
         3: dup
         4: ldc           #3                  // String Hello
         6: invokespecial #4                  // Method java/lang/RuntimeException."<init>":(Ljava/lang/String;)V
         9: athrow
      LineNumberTable:
        line 7: 0
}
SourceFile: "Main.java"

package asm.com.zarbosoft.semicompiled;

import org.objectweb.asm.AnnotationVisitor;
import org.objectweb.asm.Attribute;
import org.objectweb.asm.ClassReader;
import org.objectweb.asm.ClassWriter;
import org.objectweb.asm.ConstantDynamic;
import org.objectweb.asm.FieldVisitor;
import org.objectweb.asm.Handle;
import org.objectweb.asm.Label;
import org.objectweb.asm.MethodVisitor;
import org.objectweb.asm.Opcodes;
import org.objectweb.asm.RecordComponentVisitor;
import org.objectweb.asm.Type;
import org.objectweb.asm.TypePath;

public class MainDump implements Opcodes {

  public static byte[] dump() throws Exception {

    ClassWriter classWriter = new ClassWriter(0);
    FieldVisitor fieldVisitor;
    RecordComponentVisitor recordComponentVisitor;
    MethodVisitor methodVisitor;
    AnnotationVisitor annotationVisitor0;

    classWriter.visit(
        V1_8, ACC_SUPER, "com/zarbosoft/semicompiled/Main", null, "java/lang/Object", null);

    classWriter.visitSource("Main.java", null);

    {
      methodVisitor = classWriter.visitMethod(0, "<init>", "()V", null, null);
      methodVisitor.visitCode();
      Label label0 = new Label();
      methodVisitor.visitLabel(label0);
      methodVisitor.visitLineNumber(5, label0);
      methodVisitor.visitVarInsn(ALOAD, 0);
      methodVisitor.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V", false);
      methodVisitor.visitInsn(RETURN);
      Label label1 = new Label();
      methodVisitor.visitLabel(label1);
      methodVisitor.visitLocalVariable(
          "this", "Lcom/zarbosoft/semicompiled/Main;", null, label0, label1, 0);
      methodVisitor.visitMaxs(1, 1);
      methodVisitor.visitEnd();
    }
    {
      methodVisitor = classWriter.visitMethod(ACC_PUBLIC | ACC_STATIC, "myMain", "()V", null, null);
      methodVisitor.visitCode();
      Label label0 = new Label();
      methodVisitor.visitLabel(label0);
      methodVisitor.visitLineNumber(7, label0);
      methodVisitor.visitTypeInsn(NEW, "java/lang/RuntimeException");
      methodVisitor.visitInsn(DUP);
      methodVisitor.visitLdcInsn("Hello");
      methodVisitor.visitMethodInsn(
          INVOKESPECIAL, "java/lang/RuntimeException", "<init>", "(Ljava/lang/String;)V", false);
      methodVisitor.visitInsn(ATHROW);
      methodVisitor.visitMaxs(3, 0);
      methodVisitor.visitEnd();
    }
    classWriter.visitEnd();

    return classWriter.toByteArray();
  }
}