Examples with InsnList org.objectweb.asm.tree.InsnList used on opensource projects

Example 11 with InsnList

use of org.objectweb.asm.tree.InsnList in project Bookshelf by Darkhax-Minecraft.

the class TransformerEnchantmentHelper method transform.

public static byte[] transform(String name, String transformedName, byte[] classBytes) {
    final ClassNode clazz = ASMUtils.createClassFromByteArray(classBytes);
    final MethodNode method = METHOD_GET_ENCH_LEVEL.getMethodNode(clazz);
    final InsnList n1 = new InsnList();
    final LabelNode start = new LabelNode();
    n1.add(start);
    n1.add(new TypeInsnNode(Opcodes.NEW, "net/darkhax/bookshelf/events/EnchantmentModifierEvent"));
    n1.add(new InsnNode(Opcodes.DUP));
    n1.add(new VarInsnNode(Opcodes.ALOAD, 0));
    n1.add(new VarInsnNode(Opcodes.ALOAD, 1));
    n1.add(METHOD_INIT_EVENT.getMethodInsn(Opcodes.INVOKESPECIAL, false));
    n1.add(new VarInsnNode(Opcodes.ASTORE, 2));
    final LabelNode l1 = new LabelNode();
    n1.add(l1);
    n1.add(FIELD_EVENT_BUS.getFieldNode(Opcodes.GETSTATIC));
    n1.add(new VarInsnNode(Opcodes.ALOAD, 2));
    n1.add(METHOD_POST.getMethodInsn(Opcodes.INVOKEVIRTUAL, false));
    n1.add(new InsnNode(Opcodes.POP));
    final LabelNode l2 = new LabelNode();
    n1.add(l2);
    n1.add(new VarInsnNode(Opcodes.ALOAD, 2));
    n1.add(METHOD_CANCELED.getMethodInsn(Opcodes.INVOKEVIRTUAL, false));
    final LabelNode vanillaLogic = new LabelNode();
    n1.add(new JumpInsnNode(Opcodes.IFEQ, vanillaLogic));
    final LabelNode l4 = new LabelNode();
    n1.add(l4);
    n1.add(new VarInsnNode(Opcodes.ALOAD, 2));
    n1.add(METHOD_GET_LEVELS.getMethodInsn(Opcodes.INVOKEVIRTUAL, false));
    n1.add(new InsnNode(Opcodes.IRETURN));
    n1.add(vanillaLogic);
    method.instructions.insertBefore(method.instructions.getFirst(), n1);
    return ASMUtils.createByteArrayFromClass(clazz, ClassWriter.COMPUTE_MAXS | ClassWriter.COMPUTE_FRAMES);
}