/*

 * Copyright (c) 2011, 2019, 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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 */

package org.graalvm.compiler.hotspot;

import java.lang.reflect.Field;

import java.lang.reflect.Modifier;

import org.graalvm.compiler.api.replacements.Fold;

import org.graalvm.compiler.api.replacements.Fold.InjectedParameter;

import org.graalvm.compiler.nodes.graphbuilderconf.IntrinsicContext;

import org.graalvm.compiler.options.OptionValues;

import jdk.vm.ci.common.JVMCIError;

import jdk.vm.ci.hotspot.HotSpotVMConfigAccess;

import jdk.vm.ci.hotspot.HotSpotVMConfigStore;

import jdk.vm.ci.meta.MetaAccessProvider;

import jdk.vm.ci.services.Services;

/**

 * Base class of class hierarchy for accessing HotSpot VM configuration.

 */

public abstract class GraalHotSpotVMConfigBase extends HotSpotVMConfigAccess {

    GraalHotSpotVMConfigBase(HotSpotVMConfigStore store) {

        super(store);

        assert this instanceof GraalHotSpotVMConfig;

        versioned = new GraalHotSpotVMConfigVersioned(store);

        assert checkVersioned();

    }

    private boolean checkVersioned() {

        Class<? extends GraalHotSpotVMConfigVersioned> c = versioned.getClass();

        for (Field field : c.getDeclaredFields()) {

            int modifiers = field.getModifiers();

            if (!Modifier.isStatic(modifiers)) {

                // javac inlines non-static final fields which means

                // versioned values are ignored in non-flattened Graal

                assert !Modifier.isFinal(modifiers) : "Non-static field in " + c.getName() + " must not be final: " + field.getName();

            }

        }

        return true;

    }

    private static String getProperty(String name, String def) {

        String value = Services.getSavedProperties().get(name);

        if (value == null) {

            return def;

        }

        return value;

    }

    private static String getProperty(String name) {

        return getProperty(name, null);

    }

    /**

     * Contains values that are different between JDK versions.

     */

    protected final GraalHotSpotVMConfigVersioned versioned;

    /**

     * Sentinel value to use for an {@linkplain InjectedParameter injected}

     * {@link GraalHotSpotVMConfig} parameter to a {@linkplain Fold foldable} method.

     */

    public static final GraalHotSpotVMConfig INJECTED_VMCONFIG = null;

    public static final MetaAccessProvider INJECTED_METAACCESS = null;

    public static final OptionValues INJECTED_OPTIONVALUES = null;

    public static final IntrinsicContext INJECTED_INTRINSIC_CONTEXT = null;

    public final String osName = getHostOSName();

    public final String osArch = getHostArchitectureName();

    public final boolean windowsOs = getProperty("os.name", "").startsWith("Windows");

    public final boolean linuxOs = getProperty("os.name", "").startsWith("Linux");

    /**

     * Gets the host operating system name.

     */

    private static String getHostOSName() {

        String osName = getProperty("os.name");

        switch (osName) {

            case "Linux":

                osName = "linux";

                break;

            case "SunOS":

                osName = "solaris";

                break;

            case "Mac OS X":

                osName = "bsd";

                break;

            default:

                // Of course Windows is different...

                if (osName.startsWith("Windows")) {

                    osName = "windows";

                } else {

                    throw new JVMCIError("Unexpected OS name: " + osName);

                }

        }

        return osName;

    }

    private static String getHostArchitectureName() {

        String arch = getProperty("os.arch");

        switch (arch) {

            case "x86_64":

                arch = "amd64";

                break;

            case "sparcv9":

                arch = "sparc";

                break;

        }

        return arch;

    }

    protected final Integer intRequiredOnAMD64 = osArch.equals("amd64") ? null : 0;

    protected final Long longRequiredOnAMD64 = osArch.equals("amd64") ? null : 0L;

}