/*

 * Copyright (c) 2016, 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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package org.graalvm.compiler.hotspot.replacements;

import static jdk.vm.ci.hotspot.HotSpotJVMCIRuntimeProvider.getArrayBaseOffset;

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

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

import org.graalvm.compiler.debug.GraalError;

import org.graalvm.compiler.hotspot.HotSpotBackend;

import org.graalvm.compiler.hotspot.nodes.ComputeObjectAddressNode;

import org.graalvm.compiler.nodes.PiNode;

import org.graalvm.compiler.nodes.extended.RawLoadNode;

import org.graalvm.compiler.word.Word;

import jdk.vm.ci.meta.JavaKind;

@ClassSubstitution(className = "sun.security.provider.SHA2", optional = true)

public class SHA2Substitutions {

    static final long stateOffset;

    static final Class<?> shaClass;

    public static final String implCompressName = Java8OrEarlier ? "implCompress" : "implCompress0";

    static {

        try {

            // Need to use the system class loader as com.sun.crypto.provider.AESCrypt

            // is normally loaded by the extension class loader which is not delegated

            // to by the JVMCI class loader.

            ClassLoader cl = ClassLoader.getSystemClassLoader();

            shaClass = Class.forName("sun.security.provider.SHA2", true, cl);

            stateOffset = UnsafeAccess.UNSAFE.objectFieldOffset(shaClass.getDeclaredField("state"));

        } catch (Exception ex) {

            throw new GraalError(ex);

        }

    }

    @MethodSubstitution(isStatic = false)

    static void implCompress0(Object receiver, byte[] buf, int ofs) {

        Object realReceiver = PiNode.piCastNonNull(receiver, shaClass);

        Object state = RawLoadNode.load(realReceiver, stateOffset, JavaKind.Object, LocationIdentity.any());

        Word bufAddr = WordFactory.unsigned(ComputeObjectAddressNode.get(buf, getArrayBaseOffset(JavaKind.Byte) + ofs));

        Word stateAddr = WordFactory.unsigned(ComputeObjectAddressNode.get(state, getArrayBaseOffset(JavaKind.Int)));

        HotSpotBackend.sha2ImplCompressStub(bufAddr, stateAddr);

    }

}