/*

 * Copyright (c) 2015, 2016, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

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 */

import com.sun.tools.classfile.*;

import com.sun.tools.classfile.BootstrapMethods_attribute.BootstrapMethodSpecifier;

import com.sun.tools.classfile.ConstantPool.CONSTANT_InvokeDynamic_info;

import com.sun.tools.classfile.ConstantPool.CONSTANT_MethodHandle_info;

import java.io.File;

/*

 * @test

 * @bug     8148483 8151516 8151223

 * @summary Test that StringConcat is working for JDK >= 9

 * @modules jdk.jdeps/com.sun.tools.classfile

 *

 * @clean TestIndyStringConcat*

 * @compile -source 6 -target 6 TestIndyStringConcat.java

 * @run main TestIndyStringConcat false

 *

 * @clean TestIndyStringConcat*

 * @compile -source 7 -target 7 TestIndyStringConcat.java

 * @run main TestIndyStringConcat false

 *

 * @clean TestIndyStringConcat*

 * @compile -source 8 -target 8 TestIndyStringConcat.java

 * @run main TestIndyStringConcat false

 *

 * @clean TestIndyStringConcat*

 * @compile -XDstringConcat=inline -source 9 -target 9 TestIndyStringConcat.java

 * @run main TestIndyStringConcat false

 *

 * @clean TestIndyStringConcat*

 * @compile -XDstringConcat=indy -source 9 -target 9 TestIndyStringConcat.java

 * @run main TestIndyStringConcat true

 *

 * @clean TestIndyStringConcat*

 * @compile -XDstringConcat=indyWithConstants -source 9 -target 9 TestIndyStringConcat.java

 * @run main TestIndyStringConcat true

 */

public class TestIndyStringConcat {

    static String other;

    public static String test() {

        return "Foo" + other;

    }

    public static void main(String[] args) throws Exception {

        boolean expected = Boolean.valueOf(args[0]);

        boolean actual = hasStringConcatFactoryCall("test");

        if (expected != actual) {

            throw new AssertionError("expected = " + expected + ", actual = " + actual);

        }

    }

    public static boolean hasStringConcatFactoryCall(String methodName) throws Exception {

        ClassFile classFile = ClassFile.read(new File(System.getProperty("test.classes", "."),

                TestIndyStringConcat.class.getName() + ".class"));

        ConstantPool constantPool = classFile.constant_pool;

        BootstrapMethods_attribute bsm_attr =

                (BootstrapMethods_attribute)classFile

                        .getAttribute(Attribute.BootstrapMethods);

        for (Method method : classFile.methods) {

            if (method.getName(constantPool).equals(methodName)) {

                Code_attribute code = (Code_attribute) method.attributes

                        .get(Attribute.Code);

                for (Instruction i : code.getInstructions()) {

                    if (i.getOpcode() == Opcode.INVOKEDYNAMIC) {

                        CONSTANT_InvokeDynamic_info indyInfo =

                                (CONSTANT_InvokeDynamic_info) constantPool.get(i.getUnsignedShort(1));

                        BootstrapMethodSpecifier bsmSpec =

                                bsm_attr.bootstrap_method_specifiers[indyInfo.bootstrap_method_attr_index];

                        CONSTANT_MethodHandle_info bsmInfo =

                                (CONSTANT_MethodHandle_info) constantPool.get(bsmSpec.bootstrap_method_ref);

                        if (bsmInfo.getCPRefInfo().getClassName().equals("java/lang/invoke/StringConcatFactory")) {

                            return true;

                        }

                    }

                }

            }

        }

        return false;

    }

}