/*
 * Copyright (c) 2021, 2023, 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
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 */

/*
 * @test
 * @run testng/othervm
 *     --enable-native-access=ALL-UNNAMED
 *     TestNULLAddress
 */

import org.testng.annotations.Test;

import java.lang.foreign.Linker;
import java.lang.foreign.FunctionDescriptor;
import java.lang.foreign.MemorySegment;
import java.lang.foreign.SymbolLookup;
import java.lang.foreign.ValueLayout;
import java.lang.invoke.MethodHandle;

import static org.testng.Assert.*;

public class TestNULLAddress {

    static {
        System.loadLibrary("Null");
    }

    static final Linker LINKER = Linker.nativeLinker();

    @Test(expectedExceptions = IllegalArgumentException.class)
    public void testNULLLinking() {
        LINKER.downcallHandle(
                MemorySegment.NULL,
                FunctionDescriptor.ofVoid());
    }

    @Test(expectedExceptions = IllegalArgumentException.class)
    public void testNULLVirtual() throws Throwable {
        MethodHandle mh = LINKER.downcallHandle(
                FunctionDescriptor.ofVoid());
        mh.invokeExact(MemorySegment.NULL);
    }

    @Test
    public void testNULLReturn_target() throws Throwable {
        MethodHandle mh = LINKER.downcallHandle(SymbolLookup.loaderLookup().find("get_null").get(),
                FunctionDescriptor.of(ValueLayout.ADDRESS.withTargetLayout(ValueLayout.JAVA_INT)));
        MemorySegment ret = (MemorySegment)mh.invokeExact();
        assertTrue(ret.equals(MemorySegment.NULL));
    }

    @Test
    public void testNULLReturn_plain() throws Throwable {
        MethodHandle mh = LINKER.downcallHandle(SymbolLookup.loaderLookup().find("get_null").get(),
                FunctionDescriptor.of(ValueLayout.ADDRESS));
        MemorySegment ret = (MemorySegment)mh.invokeExact();
        assertTrue(ret.equals(MemorySegment.NULL));
    }
}