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The GraalVM compiler and the Graal-truffle optimizer.
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/*
 * Copyright (c) 2023, 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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package jdk.graal.compiler.truffle.hotspot;

import jdk.graal.compiler.debug.GraalError;
import jdk.graal.compiler.truffle.host.TruffleHostEnvironment;
import jdk.graal.compiler.truffle.TruffleCompilerImpl;
import jdk.graal.compiler.truffle.TruffleElementCache;

import com.oracle.truffle.compiler.HostMethodInfo;
import com.oracle.truffle.compiler.TruffleCompilable;
import com.oracle.truffle.compiler.TruffleCompilerRuntime;

import jdk.vm.ci.meta.MetaAccessProvider;
import jdk.vm.ci.meta.ResolvedJavaMethod;

final class HotSpotTruffleHostEnvironment extends TruffleHostEnvironment {

    private final HostMethodInfoCache hostCache;

    HotSpotTruffleHostEnvironment(TruffleCompilerRuntime runtime, MetaAccessProvider metaAccess) {
        super(runtime, metaAccess);
        this.hostCache = new HostMethodInfoCache();
    }

    @Override
    public HostMethodInfo getHostMethodInfo(ResolvedJavaMethod method) {
        return hostCache.get(method);
    }

    @Override
    protected TruffleCompilerImpl createCompiler(TruffleCompilable compilable) {
        /*
         * If we directly compile in the host, we can just lookup the host compiler.
         */
        TruffleCompilerRuntime runtime = runtime();
        try {
            return (TruffleCompilerImpl) runtime.getClass().getMethod("getTruffleCompiler", TruffleCompilable.class).invoke(runtime, compilable);
        } catch (ReflectiveOperationException e) {
            throw GraalError.shouldNotReachHere(e);
        }
    }

    final class HostMethodInfoCache extends TruffleElementCache {

        HostMethodInfoCache() {
            super(HOST_METHOD_CACHE_SIZE); // cache size
        }

        @Override
        protected Object createKey(ResolvedJavaMethod method) {
            /*
             * On HotSpot without libgraal we can reference methods directly, they won't become
             * invalid.
             */
            return method;
        }

        @Override
        protected HostMethodInfo computeValue(ResolvedJavaMethod method) {
            return runtime().getHostMethodInfo(method);
        }

    }

}