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The Qbicc builder for the java.base JDK module

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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 sun.security.provider;

import org.qbicc.rt.annotation.Tracking;
import org.qbicc.runtime.patcher.Patch;
import org.qbicc.runtime.patcher.Replace;
import org.qbicc.runtime.patcher.RunTimeAspect;

@Patch("sun.security.provider.SecureRandom$SeederHolder")
@RunTimeAspect
@Tracking("src/java.base/share/classes/sun/security/provider/SecureRandom.java")
class SecureRandom$SeederHolder$_runtime {

    @Replace
    private static final SecureRandom seeder;

    static {
        /*
         * Call to SeedGenerator.generateSeed() to add additional
         * seed material (likely from the Native implementation).
         */
        seeder = (SecureRandom)(Object)new SecureRandom$_patch(SeedGenerator.getSystemEntropy());
        byte [] b = new byte[20 /*DIGEST_SIZE*/];
        SeedGenerator.generateSeed(b);
        seeder.engineSetSeed(b);
    }
}