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 * 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 jdk.vm.ci.hotspot.amd64;

import static jdk.vm.ci.common.InitTimer.timer;

import java.util.EnumSet;

import jdk.vm.ci.amd64.AMD64;

import jdk.vm.ci.code.Architecture;

import jdk.vm.ci.code.RegisterConfig;

import jdk.vm.ci.code.TargetDescription;

import jdk.vm.ci.code.stack.StackIntrospection;

import jdk.vm.ci.common.InitTimer;

import jdk.vm.ci.hotspot.HotSpotCodeCacheProvider;

import jdk.vm.ci.hotspot.HotSpotConstantReflectionProvider;

import jdk.vm.ci.hotspot.HotSpotJVMCIBackendFactory;

import jdk.vm.ci.hotspot.HotSpotJVMCIRuntime;

import jdk.vm.ci.hotspot.HotSpotMetaAccessProvider;

import jdk.vm.ci.hotspot.HotSpotStackIntrospection;

import jdk.vm.ci.meta.ConstantReflectionProvider;

import jdk.vm.ci.runtime.JVMCIBackend;

public class AMD64HotSpotJVMCIBackendFactory implements HotSpotJVMCIBackendFactory {

    private static EnumSet<AMD64.CPUFeature> computeFeatures(AMD64HotSpotVMConfig config) {

        // Configure the feature set using the HotSpot flag settings.

        EnumSet<AMD64.CPUFeature> features = EnumSet.noneOf(AMD64.CPUFeature.class);

        if ((config.vmVersionFeatures & config.amd643DNOWPREFETCH) != 0) {

            features.add(AMD64.CPUFeature.AMD_3DNOW_PREFETCH);

        }

        assert config.useSSE >= 2 : "minimum config for x64";

        features.add(AMD64.CPUFeature.SSE);

        features.add(AMD64.CPUFeature.SSE2);

        if ((config.vmVersionFeatures & config.amd64SSE3) != 0) {

            features.add(AMD64.CPUFeature.SSE3);

        }

        if ((config.vmVersionFeatures & config.amd64SSSE3) != 0) {

            features.add(AMD64.CPUFeature.SSSE3);

        }

        if ((config.vmVersionFeatures & config.amd64SSE4A) != 0) {

            features.add(AMD64.CPUFeature.SSE4A);

        }

        if ((config.vmVersionFeatures & config.amd64SSE41) != 0) {

            features.add(AMD64.CPUFeature.SSE4_1);

        }

        if ((config.vmVersionFeatures & config.amd64SSE42) != 0) {

            features.add(AMD64.CPUFeature.SSE4_2);

        }

        if ((config.vmVersionFeatures & config.amd64POPCNT) != 0) {

            features.add(AMD64.CPUFeature.POPCNT);

        }

        if ((config.vmVersionFeatures & config.amd64LZCNT) != 0) {

            features.add(AMD64.CPUFeature.LZCNT);

        }

        if ((config.vmVersionFeatures & config.amd64ERMS) != 0) {

            features.add(AMD64.CPUFeature.ERMS);

        }

        if ((config.vmVersionFeatures & config.amd64AVX) != 0) {

            features.add(AMD64.CPUFeature.AVX);

        }

        if ((config.vmVersionFeatures & config.amd64AVX2) != 0) {

            features.add(AMD64.CPUFeature.AVX2);

        }

        if ((config.vmVersionFeatures & config.amd64AES) != 0) {

            features.add(AMD64.CPUFeature.AES);

        }

        if ((config.vmVersionFeatures & config.amd643DNOWPREFETCH) != 0) {

            features.add(AMD64.CPUFeature.AMD_3DNOW_PREFETCH);

        }

        if ((config.vmVersionFeatures & config.amd64BMI1) != 0) {

            features.add(AMD64.CPUFeature.BMI1);

        }

        if ((config.vmVersionFeatures & config.amd64BMI2) != 0) {

            features.add(AMD64.CPUFeature.BMI2);

        }

        if ((config.vmVersionFeatures & config.amd64RTM) != 0) {

            features.add(AMD64.CPUFeature.RTM);

        }

        if ((config.vmVersionFeatures & config.amd64ADX) != 0) {

            features.add(AMD64.CPUFeature.ADX);

        }

        if ((config.vmVersionFeatures & config.amd64AVX512F) != 0) {

            features.add(AMD64.CPUFeature.AVX512F);

        }

        if ((config.vmVersionFeatures & config.amd64AVX512DQ) != 0) {

            features.add(AMD64.CPUFeature.AVX512DQ);

        }

        if ((config.vmVersionFeatures & config.amd64AVX512PF) != 0) {

            features.add(AMD64.CPUFeature.AVX512PF);

        }

        if ((config.vmVersionFeatures & config.amd64AVX512ER) != 0) {

            features.add(AMD64.CPUFeature.AVX512ER);

        }

        if ((config.vmVersionFeatures & config.amd64AVX512CD) != 0) {

            features.add(AMD64.CPUFeature.AVX512CD);

        }

        if ((config.vmVersionFeatures & config.amd64AVX512BW) != 0) {

            features.add(AMD64.CPUFeature.AVX512BW);

        }

        if ((config.vmVersionFeatures & config.amd64AVX512VL) != 0) {

            features.add(AMD64.CPUFeature.AVX512VL);

        }

        if ((config.vmVersionFeatures & config.amd64SHA) != 0) {

            features.add(AMD64.CPUFeature.SHA);

        }

        if ((config.vmVersionFeatures & config.amd64FMA) != 0) {

            features.add(AMD64.CPUFeature.FMA);

        }

        return features;

    }

    private static EnumSet<AMD64.Flag> computeFlags(AMD64HotSpotVMConfig config) {

        EnumSet<AMD64.Flag> flags = EnumSet.noneOf(AMD64.Flag.class);

        if (config.useCountLeadingZerosInstruction) {

            flags.add(AMD64.Flag.UseCountLeadingZerosInstruction);

        }

        if (config.useCountTrailingZerosInstruction) {

            flags.add(AMD64.Flag.UseCountTrailingZerosInstruction);

        }

        return flags;

    }

    private static TargetDescription createTarget(AMD64HotSpotVMConfig config) {

        final int stackFrameAlignment = 16;

        final int implicitNullCheckLimit = 4096;

        final boolean inlineObjects = true;

        Architecture arch = new AMD64(computeFeatures(config), computeFlags(config));

        return new TargetDescription(arch, true, stackFrameAlignment, implicitNullCheckLimit, inlineObjects);

    }

    protected HotSpotConstantReflectionProvider createConstantReflection(HotSpotJVMCIRuntime runtime) {

        return new HotSpotConstantReflectionProvider(runtime);

    }

    private static RegisterConfig createRegisterConfig(AMD64HotSpotVMConfig config, TargetDescription target) {

        return new AMD64HotSpotRegisterConfig(target, config.useCompressedOops, config.windowsOs);

    }

    protected HotSpotCodeCacheProvider createCodeCache(HotSpotJVMCIRuntime runtime, TargetDescription target, RegisterConfig regConfig) {

        return new HotSpotCodeCacheProvider(runtime, target, regConfig);

    }

    protected HotSpotMetaAccessProvider createMetaAccess(HotSpotJVMCIRuntime runtime) {

        return new HotSpotMetaAccessProvider(runtime);

    }

    @Override

    public String getArchitecture() {

        return "AMD64";

    }

    @Override

    public String toString() {

        return "JVMCIBackend:" + getArchitecture();

    }

    @Override

    @SuppressWarnings("try")

    public JVMCIBackend createJVMCIBackend(HotSpotJVMCIRuntime runtime, JVMCIBackend host) {

        assert host == null;

        AMD64HotSpotVMConfig config = new AMD64HotSpotVMConfig(runtime.getConfigStore());

        TargetDescription target = createTarget(config);

        RegisterConfig regConfig;

        HotSpotCodeCacheProvider codeCache;

        ConstantReflectionProvider constantReflection;

        HotSpotMetaAccessProvider metaAccess;

        StackIntrospection stackIntrospection;

        try (InitTimer t = timer("create providers")) {

            try (InitTimer rt = timer("create MetaAccess provider")) {

                metaAccess = createMetaAccess(runtime);

            }

            try (InitTimer rt = timer("create RegisterConfig")) {

                regConfig = createRegisterConfig(config, target);

            }

            try (InitTimer rt = timer("create CodeCache provider")) {

                codeCache = createCodeCache(runtime, target, regConfig);

            }

            try (InitTimer rt = timer("create ConstantReflection provider")) {

                constantReflection = createConstantReflection(runtime);

            }

            try (InitTimer rt = timer("create StackIntrospection provider")) {

                stackIntrospection = new HotSpotStackIntrospection(runtime);

            }

        }

        try (InitTimer rt = timer("instantiate backend")) {

            return createBackend(metaAccess, codeCache, constantReflection, stackIntrospection);

        }

    }

    protected JVMCIBackend createBackend(HotSpotMetaAccessProvider metaAccess, HotSpotCodeCacheProvider codeCache, ConstantReflectionProvider constantReflection,

                    StackIntrospection stackIntrospection) {

        return new JVMCIBackend(metaAccess, codeCache, constantReflection, stackIntrospection);

    }

}