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/*
 * This code is based on OpenJDK source file(s) which contain the following copyright notice:
 *
 * ------
 * Copyright (c) 2001, 2021, 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.  Oracle designates this
 * 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).
 *
 * 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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 * This file may contain additional modifications which are Copyright (c) Red Hat and other
 * contributors.
 */

package jdk.internal.misc;

import java.util.Map;

import org.qbicc.rt.annotation.Tracking;
import org.qbicc.runtime.patcher.Add;
import org.qbicc.runtime.patcher.PatchClass;
import org.qbicc.runtime.patcher.Replace;

@PatchClass(jdk.internal.misc.VM.class)
@Tracking("src/java.base/share/classes/jdk/internal/misc/VM.java")
public class VM$_patch {

    // alias
    private static Map savedProps;
    private static long directMemory;


    @Replace
    public static void initializeOSEnvironment() {
        // need to remove check for initLevel() == 0 because we already moved to 4 at build time.
        OSEnvironment.initialize();
    }

    @Add
    public static void updateDirectMemoryLimit() {
        String s = savedProps.get("sun.nio.MaxDirectMemorySize");
        if (s == null || s.isEmpty() || s.equals("-1")) {
            // -XX:MaxDirectMemorySize not given, take default
            directMemory = Runtime.getRuntime().maxMemory();
        }
    }
}