feat: add classinspector for looking inside class files interactively (using a debugger)

.idea/.name

@@ -0,0 +1 @@
+bf

.idea/misc.xml

@@ -4,7 +4,7 @@
   <component name="FrameworkDetectionExcludesConfiguration">
     <file type="web" url="file://$PROJECT_DIR$" />
   </component>
-  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="17" project-jdk-type="JavaSDK">
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_17" default="true" project-jdk-name="jbr-17" project-jdk-type="JavaSDK">
     <output url="file://$PROJECT_DIR$/out" />
   </component>
 </project>

.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="" vcs="Git" />
+  </component>
+</project>

src/main/java/dev/ashhhleyyy/bad/ClassInspector.java

@@ -0,0 +1,24 @@
+package dev.ashhhleyyy.bad;
+
+import org.objectweb.asm.ClassReader;
+import org.objectweb.asm.Opcodes;
+import org.objectweb.asm.tree.ClassNode;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+public class ClassInspector {
+    public static void main(String[] args) throws IOException {
+        if (args.length < 1) {
+            System.err.println("Usage: <class>");
+            System.exit(1);
+        }
+        String path = args[0];
+        byte[] data = Files.readAllBytes(Path.of(path));
+        ClassReader reader = new ClassReader(data);
+        ClassNode cls = new ClassNode(Opcodes.ASM9);
+        reader.accept(cls, 0);
+        System.out.println("Set breakpoint here.");
+    }
+}

src/main/java/dev/ashhhleyyy/bad/framework/BytecodeBuilder.java

@@ -3,22 +3,10 @@ package dev.ashhhleyyy.bad.framework;
 import java.util.HashMap;
 import java.util.Map;
 
+import org.objectweb.asm.Handle;
 import org.objectweb.asm.Label;
 import org.objectweb.asm.Opcodes;
-import org.objectweb.asm.tree.AbstractInsnNode;
+import org.objectweb.asm.tree.*;
-import org.objectweb.asm.tree.ClassNode;
-import org.objectweb.asm.tree.FieldInsnNode;
-import org.objectweb.asm.tree.IincInsnNode;
-import org.objectweb.asm.tree.InsnNode;
-import org.objectweb.asm.tree.IntInsnNode;
-import org.objectweb.asm.tree.JumpInsnNode;
-import org.objectweb.asm.tree.LabelNode;
-import org.objectweb.asm.tree.LdcInsnNode;
-import org.objectweb.asm.tree.LocalVariableNode;
-import org.objectweb.asm.tree.MethodInsnNode;
-import org.objectweb.asm.tree.MethodNode;
-import org.objectweb.asm.tree.TypeInsnNode;
-import org.objectweb.asm.tree.VarInsnNode;
 
 public final class BytecodeBuilder {
     private final ClassNode classNode;
@@ -163,6 +151,10 @@ public final class BytecodeBuilder {
         this.add(new MethodInsnNode(Opcodes.INVOKESTATIC, owner, name, desc));
     }
 
+    public void invokedynamic(String name, String descriptor, Handle bsm, Object... bsmArgs) {
+        this.add(new InvokeDynamicInsnNode(name, descriptor, bsm, bsmArgs));
+    }
+
     private LabelNode getCurrentLabel() {
         if (this.currentLabel != null) {
             return this.currentLabel;