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 * Copyright (c) 2020, 2023, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * 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).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
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package jdk.internal.foreign.abi.x64.windows;

import jdk.internal.foreign.abi.AbstractLinker;
import jdk.internal.foreign.abi.LinkerOptions;
import jdk.internal.foreign.abi.SharedUtils;

import java.lang.foreign.FunctionDescriptor;
import java.lang.foreign.MemoryLayout;
import java.lang.foreign.ValueLayout;
import java.lang.invoke.MethodHandle;
import java.lang.invoke.MethodType;
import java.nio.ByteOrder;
import java.util.Map;

/**
 * ABI implementation based on Windows ABI AMD64 supplement v.0.99.6
 */
public final class Windowsx64Linker extends AbstractLinker {

    static final Map<String, MemoryLayout> CANONICAL_LAYOUTS =
            SharedUtils.canonicalLayouts(ValueLayout.JAVA_INT, ValueLayout.JAVA_LONG, ValueLayout.JAVA_CHAR);

    public static Windowsx64Linker getInstance() {
        final class Holder {
            private static final Windowsx64Linker INSTANCE = new Windowsx64Linker();
        }

        return Holder.INSTANCE;
    }

    private Windowsx64Linker() {
        // Ensure there is only one instance
    }

    @Override
    protected MethodHandle arrangeDowncall(MethodType inferredMethodType, FunctionDescriptor function, LinkerOptions options) {
        return CallArranger.arrangeDowncall(inferredMethodType, function, options);
    }

    @Override
    protected UpcallStubFactory arrangeUpcall(MethodType targetType, FunctionDescriptor function, LinkerOptions options) {
        return CallArranger.arrangeUpcall(targetType, function, options);
    }

    @Override
    protected ByteOrder linkerByteOrder() {
        return ByteOrder.LITTLE_ENDIAN;
    }

    @Override
    public Map<String, MemoryLayout> canonicalLayouts() {
        return CANONICAL_LAYOUTS;
    }
}
