org.objectweb.asm.tree.MethodNode#visitLdcInsn

Source File: MarkerTransformer.java From obfuscator with MIT License

6 votes

private MethodNode createMethod() {
    final MethodNode methodNode = new MethodNode(ACC_PUBLIC | ACC_STATIC, methodName, "()V", null, null);
    methodNode.visitCode();

    final Label label0 = new Label();
    methodNode.visitLabel(label0);
    methodNode.visitLineNumber(10, label0);
    methodNode.visitFieldInsn(GETSTATIC, "java/lang/System", "out", "Ljava/io/PrintStream;");
    methodNode.visitLdcInsn(text);
    methodNode.visitMethodInsn(INVOKEVIRTUAL, "java/io/PrintStream", "println", "(Ljava/lang/String;)V", false);

    final Label label1 = new Label();
    methodNode.visitLabel(label1);
    methodNode.visitLineNumber(11, label1);
    methodNode.visitInsn(RETURN);

    methodNode.visitMaxs(2, 0);
    methodNode.visitEnd();
    return methodNode;
}

Source File: EngineExtender.java From 07kit with GNU General Public License v3.0

6 votes

public MethodNode createGetter(GetterDefinition getter) {
    MethodNode method = new MethodNode(Opcodes.ACC_PUBLIC, getter.name,
            "()" + getter.signature, null, null);
    if (getter.member) {
        method.visitVarInsn(Opcodes.ALOAD, 0);
        method.visitFieldInsn(Opcodes.GETFIELD, getter.fieldClass,
                getter.fieldName, getter.actualSig);
    } else {
        method.visitFieldInsn(Opcodes.GETSTATIC, getter.fieldClass,
                getter.fieldName, getter.actualSig);
    }

    if (getter.multiplier != 0) {
        method.visitLdcInsn((int) getter.multiplier);
        method.visitInsn(Opcodes.IMUL);
    }

    method.visitInsn(Type.getType(getter.actualSig).getOpcode(Opcodes.IRETURN));
    method.visitMaxs(1, 1);
    method.visitEnd();
    return method;
}

Source File: EngineExtender.java From 07kit with GNU General Public License v3.0

6 votes

public MethodNode createSetter(GetterDefinition getter) {
    MethodNode method = new MethodNode(Opcodes.ACC_PUBLIC, getter.name.replaceFirst("get", "set"),
            "(" + getter.signature + ")V", null, null);
    method.visitVarInsn(Opcodes.ALOAD, 0);
    method.visitVarInsn(Type.getType(getter.actualSig).getOpcode(Opcodes.ILOAD), 1);

    if (getter.actualSig.equals("I") && getter.multiplier != 0) {
        method.visitLdcInsn((int) modInverse(getter.multiplier));
        method.visitInsn(Opcodes.IMUL);
    }
    if (getter.member) {
        method.visitFieldInsn(Opcodes.PUTFIELD, getter.fieldClass,
                getter.fieldName, getter.actualSig);
    } else {
        method.visitFieldInsn(Opcodes.PUTSTATIC, getter.fieldClass,
                getter.fieldName, getter.actualSig);
    }
    method.visitInsn(Opcodes.RETURN);

    method.visitMaxs(1, 1);
    method.visitEnd();
    return method;
}

Source File: StringPooler.java From radon with GNU General Public License v3.0

5 votes

private MethodNode stringPool(String className, String methodName, String fieldName, ArrayList<String> strings) {
    MethodNode method = new MethodNode(ACC_PRIVATE | ACC_STATIC | ACC_SYNTHETIC | ACC_BRIDGE, methodName, "()V",
            null, null);

    method.visitCode();
    int numberOfStrings = strings.size();
    if (numberOfStrings <= 5)
        method.visitInsn(numberOfStrings + 3);
    else if (numberOfStrings <= 127)
        method.visitIntInsn(BIPUSH, strings.size());
    else if (numberOfStrings <= 32767)
        method.visitIntInsn(SIPUSH, strings.size());
    else
        method.visitLdcInsn(strings.size());


    method.visitTypeInsn(ANEWARRAY, "java/lang/String");

    for (int i = 0; i < strings.size(); i++) {
        method.visitInsn(DUP);

        if (i <= 5)
            method.visitInsn(i + 3);
        else if (i <= 127)
            method.visitIntInsn(BIPUSH, i);
        else if (i <= 32767)
            method.visitIntInsn(SIPUSH, i);
        else
            method.visitLdcInsn(i);

        method.visitLdcInsn(strings.get(i));
        method.visitInsn(AASTORE);
    }
    method.visitFieldInsn(PUTSTATIC, className, fieldName, "[Ljava/lang/String;");
    method.visitInsn(RETURN);
    method.visitMaxs(3, 0);
    method.visitEnd();

    return method;
}

Source File: NbJShellAgent.java From netbeans with Apache License 2.0

5 votes

/**
 * Transforms an existin &lt;clinit> method. Adds bytecode before the return, if
 * exists.
 * @param className
 * @param target 
 */
private void transformClassInit(String className, MethodNode target) {
    Type classType = Type.getObjectType(className);
    if (target.instructions.size() > 0) {
        if (target.instructions.getLast().getOpcode() == Opcodes.RETURN) {
            target.instructions.remove(target.instructions.getLast());
        }
    }
    // ldc
    target.visitLdcInsn(classType);
    // invokevirtual --> classloader on stack
    target.visitMethodInsn(
            Opcodes.INVOKEVIRTUAL,
            JAVA_LANG_CLASS,
            CLASS_GET_CLASSLODER_METHOD,
            CLASS_GET_CLASSLOADER_DESC,
            false
    );
    // putstatic
    target.visitFieldInsn(
            Opcodes.PUTSTATIC,
            AGENT_CLASS,
            AGENT_CLASSLOADER_FIELD,
            AGENT_CLASSLOADER_DESC
    );
    target.visitInsn(Opcodes.RETURN);
    // ldc || classloader instance
    target.maxStack = Math.max(target.maxStack, 1);
    target.maxLocals = Math.max(target.maxLocals, 1);
    target.visitEnd();
}

Source File: TrashCodeTransformer.java From obfuscator with MIT License

4 votes

@NotNull
private MethodNode createMethod() {
    final MethodNode methodNode = new MethodNode((RandomUtil.nextInt(2) == 1 ? ACC_PUBLIC | ACC_STATIC : ACC_PRIVATE | ACC_STATIC), StringUtil.generateString(RandomUtil.nextInt(16) + 2), "()V", null, null);
    methodNode.visitCode();

    final Label label0 = new Label();
    methodNode.visitLabel(label0);
    methodNode.visitLineNumber(8, label0);
    methodNode.visitInsn(ICONST_0);
    methodNode.visitVarInsn(ISTORE, 0);

    final AtomicInteger index = new AtomicInteger(10);
    final Label label1 = new Label();
    methodNode.visitLabel(label1);
    methodNode.visitLineNumber(index.getAndIncrement(), label1);
    methodNode.visitVarInsn(ILOAD, 0);
    methodNode.visitLdcInsn(300000);
    methodNode.visitInsn(IADD);
    methodNode.visitVarInsn(ISTORE, 0);

    IntStream.range(0, RandomUtil.nextInt(216) + 1).mapToObj(i -> new Label()).forEachOrdered(label2 -> {
        methodNode.visitLabel(label2);
        methodNode.visitLineNumber(index.getAndIncrement(), label2);
        methodNode.visitVarInsn(ILOAD, 0);
        methodNode.visitLdcInsn(300000);
        methodNode.visitInsn(IADD);
        methodNode.visitVarInsn(ISTORE, 0);
    });

    final Label label3 = new Label();
    methodNode.visitLabel(label3);
    methodNode.visitLineNumber(66, label3);
    methodNode.visitInsn(RETURN);

    final Label label58 = new Label();
    methodNode.visitLabel(label58);
    methodNode.visitLocalVariable("i", "I", null, label1, label58, 0);
    methodNode.visitMaxs(2, 1);
    methodNode.visitEnd();

    return methodNode;
}

Source File: AntiDebugTransformer.java From obfuscator with MIT License

4 votes

@NotNull
private MethodNode createMethod(@NotNull ClassNode classNode) {
    final MethodNode methodNode = new MethodNode(ACC_PRIVATE | ACC_STATIC, "checkDebug", "()V", null, null);
    methodNode.visitCode();

    final Label label0 = new Label();
    methodNode.visitLabel(label0);
    methodNode.visitLineNumber(11, label0);
    methodNode.visitMethodInsn(INVOKESTATIC, "java/lang/management/ManagementFactory", "getRuntimeMXBean", "()Ljava/lang/management/RuntimeMXBean;", false);
    methodNode.visitMethodInsn(INVOKEINTERFACE, "java/lang/management/RuntimeMXBean", "getInputArguments", "()Ljava/util/List;", true);
    methodNode.visitMethodInsn(INVOKEINTERFACE, "java/util/List", "iterator", "()Ljava/util/Iterator;", true);
    methodNode.visitVarInsn(ASTORE, 1);

    final Label label1 = new Label();
    methodNode.visitLabel(label1);
    methodNode.visitFrame(F_APPEND, 1, new Object[]{"java/util/Iterator"}, 0, null);
    methodNode.visitVarInsn(ALOAD, 1);
    methodNode.visitMethodInsn(INVOKEINTERFACE, "java/util/Iterator", "hasNext", "()Z", true);

    final Label label2 = new Label();
    methodNode.visitJumpInsn(IFEQ, label2);
    methodNode.visitVarInsn(ALOAD, 1);
    methodNode.visitMethodInsn(INVOKEINTERFACE, "java/util/Iterator", "next", "()Ljava/lang/Object;", true);
    methodNode.visitTypeInsn(CHECKCAST, "java/lang/String");
    methodNode.visitVarInsn(ASTORE, 2);

    final Label label3 = new Label();
    methodNode.visitLabel(label3);
    methodNode.visitLineNumber(12, label3);
    methodNode.visitVarInsn(ALOAD, 2);

    final String debugType = debugTypes[RandomUtil.nextInt(debugTypes.length)];
    methodNode.visitLdcInsn(debugType == null ? debugTypes[0] : debugType);
    methodNode.visitMethodInsn(INVOKEVIRTUAL, "java/lang/String", "startsWith", "(Ljava/lang/String;)Z", false);

    final Label label4 = new Label();
    methodNode.visitJumpInsn(IFEQ, label4);

    final Label label5 = new Label();
    methodNode.visitLabel(label5);
    methodNode.visitLineNumber(13, label5);
    methodNode.visitIntInsn(SIPUSH, 666);
    methodNode.visitMethodInsn(INVOKESTATIC, "java/lang/System", "exit", "(I)V", false);
    methodNode.visitLabel(label4);
    methodNode.visitLineNumber(15, label4);
    methodNode.visitFrame(F_SAME, 0, null, 0, null);
    methodNode.visitJumpInsn(GOTO, label1);
    methodNode.visitLabel(label2);
    methodNode.visitLineNumber(16, label2);
    methodNode.visitFrame(F_CHOP, 1, null, 0, null);
    methodNode.visitInsn(RETURN);

    final Label label6 = new Label();
    methodNode.visitLabel(label6);
    methodNode.visitLocalVariable("string", "Ljava/lang/String;", null, label3, label4, 2);
    methodNode.visitLocalVariable("this", "L" + classNode.name + ";", null, label0, label6, 0);

    methodNode.visitMaxs(2, 3);
    methodNode.visitEnd();

    return methodNode;
}

Java Code Examples for org.objectweb.asm.tree.MethodNode#visitLdcInsn()