/*

 * 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

 * questions.

 */

/**

 * @test

 * @bug 8136421

 * @requires (vm.simpleArch == "x64" | vm.simpleArch == "sparcv9" | vm.simpleArch == "aarch64")

 * @library /test/lib /

 * @library ../common/patches

 * @modules java.base/jdk.internal.misc

 * @modules java.base/jdk.internal.org.objectweb.asm

 *          java.base/jdk.internal.org.objectweb.asm.tree

 *          jdk.vm.ci/jdk.vm.ci.hotspot

 *          jdk.vm.ci/jdk.vm.ci.code

 * @build jdk.vm.ci/jdk.vm.ci.hotspot.CompilerToVMHelper

 * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI

 *                   compiler.jvmci.compilerToVM.GetBytecodeTest

 */

package compiler.jvmci.compilerToVM;

import compiler.jvmci.common.CTVMUtilities;

import compiler.jvmci.common.testcases.TestCase;

import jdk.internal.org.objectweb.asm.Opcodes;

import jdk.test.lib.Asserts;

import jdk.vm.ci.hotspot.CompilerToVMHelper;

import jdk.vm.ci.hotspot.HotSpotResolvedJavaMethod;

import java.lang.reflect.Executable;

import java.lang.reflect.Modifier;

public class GetBytecodeTest {

    public static void main(String[] args) {

        TestCase.getAllExecutables()

                .forEach(GetBytecodeTest::runSanityTest);

    }

    private static void runSanityTest(Executable aMethod) {

        HotSpotResolvedJavaMethod method = CTVMUtilities

                .getResolvedMethod(aMethod);

        byte[] bytecode = CompilerToVMHelper.getBytecode(method);

        int mods = aMethod.getModifiers();

        boolean shouldHasZeroLength = Modifier.isAbstract(mods)

                || Modifier.isNative(mods);

        boolean correctLength = (bytecode.length == 0 && shouldHasZeroLength)

                || (bytecode.length > 0 && !shouldHasZeroLength);

        Asserts.assertTrue(correctLength, "Bytecode of '" + aMethod + "' has "

                + bytecode.length + " length");

        if (!shouldHasZeroLength) {

            Asserts.assertTrue(containsReturn(bytecode), "Bytecode of '"

                    + aMethod + "' doesn't have any return statement");

        }

    }

    private static boolean containsReturn(byte[] bytecode) {

        for (byte b : bytecode) {

            //  cast unsigned byte to int

            int value = (int) b & 0x000000FF;

            switch (value) {

                case Opcodes.RET:

                case Opcodes.ARETURN:

                case Opcodes.IRETURN:

                case Opcodes.LRETURN:

                case Opcodes.FRETURN:

                case Opcodes.DRETURN:

                case Opcodes.RETURN:

                    return true;

            }

        }

        return false;

    }

}