/*
 * Copyright (c) 2014, 2018, 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.
 *
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 */

package compiler.testlibrary.sha.predicate;

import jdk.test.lib.Platform;
import jdk.test.lib.cli.predicate.AndPredicate;
import jdk.test.lib.cli.predicate.CPUSpecificPredicate;
import jdk.test.lib.cli.predicate.OrPredicate;
import sun.hotspot.WhiteBox;

import java.lang.reflect.Method;
import java.util.function.BooleanSupplier;

/**
 * Helper class aimed to provide predicates on availability of SHA-related
 * CPU instructions and intrinsics.
 */
public class IntrinsicPredicates {
    private static final WhiteBox WHITE_BOX = WhiteBox.getWhiteBox();
    private static final long TIERED_MAX_LEVEL = 4L;
    /**
     * Boolean supplier that check if any method could be compiled by C2.
     * Method potentially could be compiled by C2 if Server VM is used and
     * either tiered compilation is disabled or TIERED_MAX_LEVEL tier is
     * reachable.
     *
     * Please don't place this definition after SHA*_INTRINSICS_AVAILABLE
     * definitions. Otherwise its value will be {@code null} at the time when
     * all dependent fields will be initialized.
     */
    private static final BooleanSupplier COMPILABLE_BY_C2 = () -> {
        boolean isTiered = IntrinsicPredicates.WHITE_BOX.getBooleanVMFlag(
                "TieredCompilation");
        long tieredMaxLevel = IntrinsicPredicates.WHITE_BOX.getIntxVMFlag(
                "TieredStopAtLevel");
        boolean maxLevelIsReachable = (tieredMaxLevel
                == IntrinsicPredicates.TIERED_MAX_LEVEL);
        return Platform.isServer() && !Platform.isEmulatedClient() && (!isTiered || maxLevelIsReachable);
    };

    public static final BooleanSupplier SHA1_INSTRUCTION_AVAILABLE
            = new OrPredicate(new CPUSpecificPredicate("aarch64.*", new String[] { "sha1" }, null),
              new OrPredicate(new CPUSpecificPredicate("s390.*",    new String[] { "sha1" }, null),
              new OrPredicate(new CPUSpecificPredicate("sparc.*",   new String[] { "sha1" }, null),
              // x86 variants
              new OrPredicate(new CPUSpecificPredicate("amd64.*",   new String[] { "sha" },  null),
              new OrPredicate(new CPUSpecificPredicate("i386.*",    new String[] { "sha" },  null),
                              new CPUSpecificPredicate("x86.*",     new String[] { "sha" },  null))))));

    public static final BooleanSupplier SHA256_INSTRUCTION_AVAILABLE
            = new OrPredicate(new CPUSpecificPredicate("aarch64.*", new String[] { "sha256"       }, null),
              new OrPredicate(new CPUSpecificPredicate("s390.*",    new String[] { "sha256"       }, null),
              new OrPredicate(new CPUSpecificPredicate("sparc.*",   new String[] { "sha256"       }, null),
              new OrPredicate(new CPUSpecificPredicate("ppc64.*",   new String[] { "sha"          }, null),
              new OrPredicate(new CPUSpecificPredicate("ppc64le.*", new String[] { "sha"          }, null),
              // x86 variants
              new OrPredicate(new CPUSpecificPredicate("amd64.*",   new String[] { "sha"          }, null),
              new OrPredicate(new CPUSpecificPredicate("i386.*",    new String[] { "sha"          }, null),
              new OrPredicate(new CPUSpecificPredicate("x86.*",     new String[] { "sha"          }, null),
              new OrPredicate(new CPUSpecificPredicate("amd64.*",   new String[] { "avx2", "bmi2" }, null),
                              new CPUSpecificPredicate("x86_64",    new String[] { "avx2", "bmi2" }, null))))))))));

    public static final BooleanSupplier SHA512_INSTRUCTION_AVAILABLE
            = new OrPredicate(new CPUSpecificPredicate("aarch64.*", new String[] { "sha512"       }, null),
              new OrPredicate(new CPUSpecificPredicate("s390.*",    new String[] { "sha512"       }, null),
              new OrPredicate(new CPUSpecificPredicate("sparc.*",   new String[] { "sha512"       }, null),
              new OrPredicate(new CPUSpecificPredicate("ppc64.*",   new String[] { "sha"          }, null),
              new OrPredicate(new CPUSpecificPredicate("ppc64le.*", new String[] { "sha"          }, null),
              // x86 variants
              new OrPredicate(new CPUSpecificPredicate("amd64.*",   new String[] { "sha"          }, null),
              new OrPredicate(new CPUSpecificPredicate("i386.*",    new String[] { "sha"          }, null),
              new OrPredicate(new CPUSpecificPredicate("x86.*",     new String[] { "sha"          }, null),
              new OrPredicate(new CPUSpecificPredicate("amd64.*",   new String[] { "avx2", "bmi2" }, null),
                              new CPUSpecificPredicate("x86_64",    new String[] { "avx2", "bmi2" }, null))))))))));

    public static final BooleanSupplier ANY_SHA_INSTRUCTION_AVAILABLE
            = new OrPredicate(IntrinsicPredicates.SHA1_INSTRUCTION_AVAILABLE,
                    new OrPredicate(
                            IntrinsicPredicates.SHA256_INSTRUCTION_AVAILABLE,
                            IntrinsicPredicates.SHA512_INSTRUCTION_AVAILABLE));

    public static BooleanSupplier isSHA1IntrinsicAvailable() {
        return new AndPredicate(IntrinsicPredicates.COMPILABLE_BY_C2,
                                IntrinsicPredicates.isIntrinsicAvailable("sun.security.provider.SHA", "implCompress0"));
    }

    public static BooleanSupplier isSHA256IntrinsicAvailable() {
        return new AndPredicate(IntrinsicPredicates.COMPILABLE_BY_C2,
                                IntrinsicPredicates.isIntrinsicAvailable("sun.security.provider.SHA2", "implCompress0"));
    }

    public static BooleanSupplier isSHA512IntrinsicAvailable() {
        return new AndPredicate(IntrinsicPredicates.COMPILABLE_BY_C2,
                                IntrinsicPredicates.isIntrinsicAvailable("sun.security.provider.SHA5", "implCompress0"));
    }

    private static BooleanSupplier isIntrinsicAvailable(String klass, String method) {
        try {
            Method m = Class.forName(klass).getDeclaredMethod(method, byte[].class, int.class);
            return () -> WHITE_BOX.isIntrinsicAvailable(m, (int)IntrinsicPredicates.TIERED_MAX_LEVEL);
        } catch (Exception e) {
            throw new RuntimeException("Intrinsified method " +  klass + "::" + method + " not found!");
        }
    };
}