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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.aarch64;

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

import java.util.EnumSet;

import jdk.vm.ci.aarch64.AArch64;
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.hotspot.HotSpotCodeCacheProvider;
import jdk.vm.ci.hotspot.HotSpotConstantReflectionProvider;
import jdk.vm.ci.hotspot.HotSpotJVMCIBackendFactory;
import jdk.vm.ci.hotspot.HotSpotJVMCIRuntimeProvider;
import jdk.vm.ci.hotspot.HotSpotMetaAccessProvider;
import jdk.vm.ci.hotspot.HotSpotStackIntrospection;
import jdk.vm.ci.hotspot.HotSpotVMConfig;
import jdk.vm.ci.inittimer.InitTimer;
import jdk.vm.ci.meta.ConstantReflectionProvider;
import jdk.vm.ci.runtime.JVMCIBackend;

public class AArch64HotSpotJVMCIBackendFactory implements HotSpotJVMCIBackendFactory {

    protected EnumSet<AArch64.CPUFeature> computeFeatures(@SuppressWarnings("unused") HotSpotVMConfig config) {
        // Configure the feature set using the HotSpot flag settings.
        EnumSet<AArch64.CPUFeature> features = EnumSet.noneOf(AArch64.CPUFeature.class);
        return features;
    }

    protected EnumSet<AArch64.Flag> computeFlags(@SuppressWarnings("unused") HotSpotVMConfig config) {
        EnumSet<AArch64.Flag> flags = EnumSet.noneOf(AArch64.Flag.class);
        return flags;
    }

    protected TargetDescription createTarget(HotSpotVMConfig config) {
        final int stackFrameAlignment = 16;
        final int implicitNullCheckLimit = 4096;
        final boolean inlineObjects = true;
        Architecture arch = new AArch64(computeFeatures(config), computeFlags(config));
        return new TargetDescription(arch, true, stackFrameAlignment, implicitNullCheckLimit, inlineObjects);
    }

    protected HotSpotConstantReflectionProvider createConstantReflection(HotSpotJVMCIRuntimeProvider runtime) {
        return new HotSpotConstantReflectionProvider(runtime);
    }

    protected RegisterConfig createRegisterConfig(HotSpotJVMCIRuntimeProvider runtime, TargetDescription target) {
        return new AArch64HotSpotRegisterConfig(target.arch, runtime.getConfig());
    }

    protected HotSpotCodeCacheProvider createCodeCache(HotSpotJVMCIRuntimeProvider runtime, TargetDescription target, RegisterConfig regConfig) {
        return new HotSpotCodeCacheProvider(runtime, runtime.getConfig(), target, regConfig);
    }

    protected HotSpotMetaAccessProvider createMetaAccess(HotSpotJVMCIRuntimeProvider runtime) {
        return new HotSpotMetaAccessProvider(runtime);
    }

    @Override
    public String getArchitecture() {
        return "aarch64";
    }

    @Override
    public String toString() {
        return "JVMCIBackend:" + getArchitecture();
    }

    @SuppressWarnings("try")
    public JVMCIBackend createJVMCIBackend(HotSpotJVMCIRuntimeProvider runtime, JVMCIBackend host) {

        assert host == null;
        TargetDescription target = createTarget(runtime.getConfig());

        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(runtime, 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);
    }
}