Example usage for org.objectweb.asm.tree MethodNode visitCode

List of usage examples for org.objectweb.asm.tree MethodNode visitCode

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Introduction

In this page you can find the example usage for org.objectweb.asm.tree MethodNode visitCode.

Prototype

@Override
    public void visitCode()

Source Link

Usage

From source file:de.sanandrew.core.manpack.transformer.TransformHorseArmor.java

License:Creative Commons License

private static MethodNode injectMethodSetCustomArmorItem() {
    MethodNode method = ASMHelper.getMethodNode(Opcodes.ACC_PRIVATE, ASMNames.MD_SAP_SET_CUSTOM_ARMOR_ITEM);
    method.visitCode();
    Label l0 = new Label();
    method.visitLabel(l0);//from   ww w .  j ava2  s  .  co m
    method.visitVarInsn(Opcodes.ALOAD, 1);
    Label l1 = new Label();
    method.visitJumpInsn(Opcodes.IFNONNULL, l1);
    method.visitTypeInsn(Opcodes.NEW, ASMNames.CL_ITEM_STACK);
    method.visitInsn(Opcodes.DUP);
    ASMHelper.visitFieldInsn(method, Opcodes.GETSTATIC, ASMNames.FD_ITEMS_IRON_SHOVEL);
    method.visitInsn(Opcodes.ICONST_0);
    ASMHelper.visitMethodInsn(method, Opcodes.INVOKESPECIAL, ASMNames.MD_ITEMSTACK_INIT, false);
    method.visitVarInsn(Opcodes.ASTORE, 1);
    method.visitLabel(l1);
    method.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
    method.visitVarInsn(Opcodes.ALOAD, 0);
    ASMHelper.visitFieldInsn(method, Opcodes.GETFIELD, ASMNames.FD_HORSE_DATAWATCHER);
    method.visitIntInsn(Opcodes.BIPUSH, 23);
    method.visitVarInsn(Opcodes.ALOAD, 1);
    ASMHelper.visitMethodInsn(method, Opcodes.INVOKEVIRTUAL, ASMNames.MD_DATAWATCHER_UPDATE_OBJ, false);
    Label l3 = new Label();
    method.visitLabel(l3);
    method.visitInsn(Opcodes.RETURN);
    Label l4 = new Label();
    method.visitLabel(l4);
    method.visitLocalVariable("this", ASMNames.CL_T_ENTITY_HORSE, null, l0, l3, 0);
    method.visitLocalVariable("stack", ASMNames.CL_T_ITEM_STACK, null, l0, l3, 1);
    method.visitMaxs(5, 2);
    method.visitEnd();

    return method;
}

From source file:de.sanandrew.core.manpack.transformer.TransformPlayerDismountCtrl.java

License:Creative Commons License

/**
 * Transforms the Entity.class by adding a new method called _SAP_canDismountOnInput.<br>
 * This method can be overridden by any entity to control wether or not the rider can dismount via sneaking (usually by pressing LSHIFT for the player).
 *
 * @param bytes     the class bytes to be transformed
 * @return the transformed class bytes//from   w  w w. ja  v a 2  s.  c  o m
 */
private static byte[] transformEntity(byte[] bytes) {
    ClassNode clazz = ASMHelper.createClassNode(bytes);

    MethodNode method = ASMHelper.getMethodNode(Opcodes.ACC_PUBLIC, ASMNames.MD_SAP_CAN_DISMOUNT_ON_INPUT);
    method.visitCode();
    Label l0 = new Label();
    method.visitLabel(l0);
    method.visitInsn(Opcodes.ICONST_1);
    method.visitInsn(Opcodes.IRETURN);
    Label l1 = new Label();
    method.visitLabel(l1);
    method.visitLocalVariable("this", ASMNames.CL_T_ENTITY, null, l0, l1, 0);
    method.visitLocalVariable("player", ASMNames.CL_T_ENTITY_PLAYER, null, l0, l1, 1);
    method.visitMaxs(1, 2);
    method.visitEnd();

    clazz.methods.add(method);

    bytes = ASMHelper.createBytes(clazz, /*ClassWriter.COMPUTE_FRAMES |*/ ClassWriter.COMPUTE_MAXS);
    return bytes;
}

From source file:naftoreiclag.dontdigleft.transformer.ResizePlayerBoudingBox.java

License:Open Source License

@Override
public byte[] transform(String name, String transformedName, byte[] basicClass) {
    if (name.equals("net.minecraft.entity.player.EntityPlayer") || name.equals("xl")) {
        ClassNode classNode = new ClassNode();
        ClassReader classReader = new ClassReader(basicClass);

        classReader.accept(classNode, 0);

        MethodNode mv = new MethodNode(ASM4, ACC_PROTECTED, "setSize", "(FF)V", null, null);

        mv.visitCode();
        Label l0 = new Label();
        mv.visitLabel(l0);//from ww w  .  j a  v a 2 s.  co m
        mv.visitVarInsn(FLOAD, 1);
        mv.visitLdcInsn(new Float("0.6"));
        mv.visitInsn(FCMPL);
        Label l1 = new Label();
        mv.visitJumpInsn(IFNE, l1);
        mv.visitVarInsn(FLOAD, 2);
        mv.visitLdcInsn(new Float("1.8"));
        mv.visitInsn(FCMPL);
        mv.visitJumpInsn(IFNE, l1);
        Label l2 = new Label();
        mv.visitLabel(l2);
        mv.visitLdcInsn(new Float("0.6"));
        mv.visitVarInsn(FSTORE, 1);
        Label l3 = new Label();
        mv.visitLabel(l3);
        mv.visitLdcInsn(new Float("0.6"));
        mv.visitVarInsn(FSTORE, 2);
        mv.visitLabel(l1);
        mv.visitFrame(Opcodes.F_SAME, 0, null, 0, null);
        mv.visitVarInsn(ALOAD, 0);
        mv.visitVarInsn(FLOAD, 1);
        mv.visitVarInsn(FLOAD, 2);
        mv.visitMethodInsn(INVOKESPECIAL, "net/minecraft/entity/Entity", "setSize", "(FF)V");
        Label l4 = new Label();
        mv.visitLabel(l4);
        mv.visitInsn(RETURN);
        Label l5 = new Label();
        mv.visitLabel(l5);
        mv.visitLocalVariable("this", "Lnet/minecraft/entity/player/EntityPlayer;", null, l0, l5, 0);
        mv.visitLocalVariable("par1", "F", null, l0, l5, 1);
        mv.visitLocalVariable("par2", "F", null, l0, l5, 2);
        mv.visitMaxs(3, 3);
        mv.visitEnd();

        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);
        classNode.accept(cw);
        mv.accept(cw);

        return cw.toByteArray();
    } else {
        return basicClass;
    }
}

From source file:org.lenskit.data.entities.AbstractBeanEntity.java

License:Open Source License

private static MethodNode generateGetterMethod(Class<? extends AbstractBeanEntity> type, Method getter) {
    MethodNode gn = new MethodNode();
    gn.name = "get";
    gn.desc = Type.getMethodDescriptor(Type.getType(Object.class), Type.getType(AbstractBeanEntity.class));
    gn.access = ACC_PUBLIC;// w  w  w . jav a 2s  .  c  om
    gn.exceptions = Collections.emptyList();
    Type rt = Type.getReturnType(getter);
    gn.maxLocals = 2;
    gn.maxStack = 1 + rt.getSize();
    gn.visitCode();
    // load the target object from parameter
    gn.visitVarInsn(ALOAD, 1);
    // cast to target object type
    gn.visitTypeInsn(CHECKCAST, Type.getInternalName(type));
    // call target object method
    gn.visitMethodInsn(INVOKEVIRTUAL, Type.getInternalName(type), getter.getName(),
            Type.getMethodDescriptor(getter), false);
    // convert from primitive to object if necessary
    CGUtils.adaptFromType(gn, getter.getReturnType());
    gn.visitInsn(ARETURN);
    return gn;
}

From source file:org.lenskit.data.entities.AbstractBeanEntity.java

License:Open Source License

private static MethodNode generateLongGetterMethod(Class<? extends AbstractBeanEntity> type, Method getter) {
    MethodNode gn = new MethodNode();
    gn.name = "getLong";
    gn.desc = Type.getMethodDescriptor(Type.LONG_TYPE, Type.getType(AbstractBeanEntity.class));
    gn.access = ACC_PUBLIC;//  w ww .java  2 s .  c om
    gn.exceptions = Collections.emptyList();
    gn.maxLocals = 2;
    gn.maxStack = 2;
    gn.visitCode();
    gn.visitVarInsn(ALOAD, 1);
    gn.visitTypeInsn(CHECKCAST, Type.getInternalName(type));
    gn.visitMethodInsn(INVOKEVIRTUAL, Type.getInternalName(type), getter.getName(),
            Type.getMethodDescriptor(getter), false);
    gn.visitInsn(LRETURN);
    return gn;
}

From source file:org.lenskit.data.entities.AbstractBeanEntity.java

License:Open Source License

private static MethodNode generateDoubleGetterMethod(Class<? extends AbstractBeanEntity> type, Method getter) {
    MethodNode gn = new MethodNode();
    gn.name = "getDouble";
    gn.desc = Type.getMethodDescriptor(Type.DOUBLE_TYPE, Type.getType(AbstractBeanEntity.class));
    gn.access = ACC_PUBLIC;/*from www.j a  v a2s  . c  om*/
    gn.exceptions = Collections.emptyList();
    gn.maxLocals = 2;
    gn.maxStack = 2;
    gn.visitCode();
    gn.visitVarInsn(ALOAD, 1);
    gn.visitTypeInsn(CHECKCAST, Type.getInternalName(type));
    gn.visitMethodInsn(INVOKEVIRTUAL, Type.getInternalName(type), getter.getName(),
            Type.getMethodDescriptor(getter), false);
    gn.visitInsn(DRETURN);
    return gn;
}