ASM InnerClass bug

PositionsClassDump.java

package test;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.util.*;
import org.objectweb.asm.*;
import org.objectweb.asm.tree.ClassNode;
import org.objectweb.asm.util.TraceClassVisitor;


public class PositionsClassDump implements Opcodes {

    public static void main(String[] args) {
        try {
            System.out.println("Visit inner classes before methods: everything is OK\n");
            traceClass(dump(true));

            System.out.println("\n\n\n\nVisit inner classes after methods: some InnerClass attributes are missing\n");
            traceClass(dump(false));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void traceClass(byte[] bytes) {
        ClassNode node = new ClassNode();
        new ClassReader(bytes).accept(node, 0);
        PrintWriter w = new PrintWriter(System.out);
        node.accept(new TraceClassVisitor(w));
        w.flush();
    }

    public static class Writer extends ClassWriter {

        public Writer(int flags) {
            super(flags);
        }

        @Override
        protected String getCommonSuperClass(String type1, String type2) {
            return "";
        }
    }


    public static void visitInnerClasses(ClassWriter cw) {

        cw.visitInnerClass("scala/reflect/internal/Positions$PosAssigner", "scala/reflect/internal/Positions", "PosAssigner", ACC_PUBLIC + ACC_ABSTRACT + ACC_INTERFACE);
        cw.visitInnerClass("scala/reflect/internal/settings/MutableSettings$SettingValue", "scala/reflect/internal/settings/MutableSettings", "SettingValue", ACC_PUBLIC + ACC_ABSTRACT + ACC_INTERFACE);
        cw.visitInnerClass("scala/reflect/internal/Positions$DefaultPosAssigner", "scala/reflect/internal/Positions", "DefaultPosAssigner", ACC_PUBLIC);
        cw.visitInnerClass("scala/tools/nsc/settings/MutableSettings$BooleanSetting", "scala/tools/nsc/settings/MutableSettings", "BooleanSetting", ACC_PUBLIC);
        cw.visitInnerClass("scala/tools/nsc/ast/Positions$ValidatingPosAssigner", "scala/tools/nsc/ast/Positions", "ValidatingPosAssigner", ACC_PUBLIC);
    }

    public static byte[] dump(boolean innerClassesFirst) throws Exception {

        ClassWriter cw = new Writer(ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
        FieldVisitor fv;
        MethodVisitor mv;
        AnnotationVisitor av0;

        cw.visit(V1_6, ACC_PUBLIC + ACC_SUPER + ACC_ABSTRACT, "scala/tools/nsc/ast/Positions$class", null, "java/lang/Object", null);


        if (innerClassesFirst)
            visitInnerClasses(cw);



        {
            mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "posAssigner", "(Lscala/tools/nsc/Global;)Lscala/reflect/internal/Positions$PosAssigner;", null, null);
            mv.visitCode();
            mv.visitFieldInsn(GETSTATIC, "scala/reflect/internal/settings/MutableSettings$", "MODULE$", "Lscala/reflect/internal/settings/MutableSettings$;");
            mv.visitVarInsn(ALOAD, 0);
            mv.visitMethodInsn(INVOKEVIRTUAL, "scala/tools/nsc/Global", "settings", "()Lscala/tools/nsc/Settings;", false);
            mv.visitMethodInsn(INVOKEVIRTUAL, "scala/tools/nsc/Settings", "Yrangepos", "()Lscala/tools/nsc/settings/MutableSettings$BooleanSetting;", false);
            mv.visitMethodInsn(INVOKEVIRTUAL, "scala/reflect/internal/settings/MutableSettings$", "reflectSettingToBoolean", "(Lscala/reflect/internal/settings/MutableSettings$SettingValue;)Z", false);
            Label l0 = new Label();
            mv.visitJumpInsn(IFEQ, l0);
            mv.visitFieldInsn(GETSTATIC, "scala/reflect/internal/settings/MutableSettings$", "MODULE$", "Lscala/reflect/internal/settings/MutableSettings$;");
            mv.visitVarInsn(ALOAD, 0);
            mv.visitMethodInsn(INVOKEVIRTUAL, "scala/tools/nsc/Global", "settings", "()Lscala/tools/nsc/Settings;", false);
            mv.visitMethodInsn(INVOKEVIRTUAL, "scala/tools/nsc/Settings", "debug", "()Lscala/tools/nsc/settings/MutableSettings$BooleanSetting;", false);
            mv.visitMethodInsn(INVOKEVIRTUAL, "scala/reflect/internal/settings/MutableSettings$", "reflectSettingToBoolean", "(Lscala/reflect/internal/settings/MutableSettings$SettingValue;)Z", false);
            Label l1 = new Label();
            mv.visitJumpInsn(IFNE, l1);
            mv.visitLabel(l0);
            mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
            mv.visitFieldInsn(GETSTATIC, "scala/reflect/internal/settings/MutableSettings$", "MODULE$", "Lscala/reflect/internal/settings/MutableSettings$;");
            mv.visitVarInsn(ALOAD, 0);
            mv.visitMethodInsn(INVOKEVIRTUAL, "scala/tools/nsc/Global", "settings", "()Lscala/tools/nsc/Settings;", false);
            mv.visitMethodInsn(INVOKEVIRTUAL, "scala/tools/nsc/Settings", "Yposdebug", "()Lscala/tools/nsc/settings/MutableSettings$BooleanSetting;", false);
            mv.visitMethodInsn(INVOKEVIRTUAL, "scala/reflect/internal/settings/MutableSettings$", "reflectSettingToBoolean", "(Lscala/reflect/internal/settings/MutableSettings$SettingValue;)Z", false);
            Label l2 = new Label();
            mv.visitJumpInsn(IFEQ, l2);
            mv.visitLabel(l1);
            mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
            mv.visitTypeInsn(NEW, "scala/tools/nsc/ast/Positions$ValidatingPosAssigner");
            mv.visitInsn(DUP);
            mv.visitVarInsn(ALOAD, 0);
            mv.visitMethodInsn(INVOKESPECIAL, "scala/tools/nsc/ast/Positions$ValidatingPosAssigner", "<init>", "(Lscala/tools/nsc/Global;)V", false);
            Label l3 = new Label();
            mv.visitJumpInsn(GOTO, l3);
            mv.visitLabel(l2);
            mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
            mv.visitTypeInsn(NEW, "scala/reflect/internal/Positions$DefaultPosAssigner");
            mv.visitInsn(DUP);
            mv.visitVarInsn(ALOAD, 0);
            mv.visitMethodInsn(INVOKESPECIAL, "scala/reflect/internal/Positions$DefaultPosAssigner", "<init>", "(Lscala/reflect/internal/SymbolTable;)V", false);
            mv.visitLabel(l3);
            mv.visitFrame(Opcodes.F_SAME1, 0, null, 1, new Object[] {"scala/reflect/api/Trees$Traverser"});
            mv.visitInsn(ARETURN);
            mv.visitMaxs(3, 1);
            mv.visitEnd();
        }
        {
            mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC, "$init$", "(Lscala/tools/nsc/Global;)V", null, null);
            mv.visitCode();
            mv.visitInsn(RETURN);
            mv.visitMaxs(0, 1);
            mv.visitEnd();
        }

        if (!innerClassesFirst)
            visitInnerClasses(cw);

        cw.visitEnd();

        return cw.toByteArray();
    }
}