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Implementation of the Truffle NFI using CLinker from project panama.
There is a newer version: 24.1.0
/*
 * Copyright (c) 2017, 2021, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * The Universal Permissive License (UPL), Version 1.0
 *
 * Subject to the condition set forth below, permission is hereby granted to any
 * person obtaining a copy of this software, associated documentation and/or
 * data (collectively the "Software"), free of charge and under any and all
 * copyright rights in the Software, and any and all patent rights owned or
 * freely licensable by each licensor hereunder covering either (i) the
 * unmodified Software as contributed to or provided by such licensor, or (ii)
 * the Larger Works (as defined below), to deal in both
 *
 * (a) the Software, and
 *
 * (b) any piece of software and/or hardware listed in the lrgrwrks.txt file if
 * one is included with the Software each a "Larger Work" to which the Software
 * is contributed by such licensors),
 *
 * without restriction, including without limitation the rights to copy, create
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 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
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 * This license is subject to the following condition:
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 * The above copyright notice and either this complete permission notice or at a
 * minimum a reference to the UPL must be included in all copies or substantial
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package com.oracle.truffle.nfi.backend.panama;

import java.lang.foreign.MemorySegment;
import java.lang.ref.Reference;

import com.oracle.truffle.api.dsl.Cached;
import com.oracle.truffle.api.dsl.GenerateAOT;
import com.oracle.truffle.api.dsl.GenerateInline;
import com.oracle.truffle.api.dsl.GenerateUncached;
import com.oracle.truffle.api.dsl.ImportStatic;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.interop.ArityException;
import com.oracle.truffle.api.interop.UnsupportedTypeException;
import com.oracle.truffle.api.nodes.DirectCallNode;
import com.oracle.truffle.api.nodes.ExplodeLoop;
import com.oracle.truffle.api.nodes.IndirectCallNode;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.nodes.RootNode;

import com.oracle.truffle.nfi.backend.panama.PanamaSignature.CachedSignatureInfo;

@GenerateUncached
@ImportStatic(PanamaNFILanguage.class)
@GenerateAOT
@GenerateInline(false)
abstract class FunctionExecuteNode extends Node {

    public abstract Object execute(long receiver, PanamaSignature signature, Object[] args) throws ArityException, UnsupportedTypeException;

    @Specialization(guards = "signature.signatureInfo == cachedInfo", limit = "3")
    @GenerateAOT.Exclude
    protected Object cachedSignature(long receiver, PanamaSignature signature, Object[] args,
                    @Cached("signature.signatureInfo") @SuppressWarnings("unused") CachedSignatureInfo cachedInfo,
                    @Cached("createCachedSignatureCall(cachedInfo)") DirectCallNode execute) {
        try {
            return execute.call(receiver, args, signature);
        } finally {
            /*
             * Ensure that the GC can not free the objects as long as they might still be in use by
             * the native code (maybe indirectly via an embedded native pointer).
             */
            Reference.reachabilityFence(args);
        }
    }

    protected static DirectCallNode createCachedSignatureCall(CachedSignatureInfo signature) {
        DirectCallNode callNode = DirectCallNode.create(signature.callTarget);
        callNode.forceInlining();
        return callNode;
    }

    @Specialization(replaces = "cachedSignature")
    static Object genericExecute(long receiver, PanamaSignature signature, Object[] args,
                    @Cached IndirectCallNode execute) {
        try {
            return execute.call(signature.signatureInfo.callTarget, receiver, args, signature);
        } finally {
            /*
             * Ensure that the GC can not free the objects as long as they might still be in use by
             * the native code (maybe indirectly via an embedded native pointer).
             */
            Reference.reachabilityFence(args);
        }
    }

    abstract static class SignatureExecuteNode extends RootNode {

        final CachedSignatureInfo signatureInfo;
        @Children ArgumentNode[] argNodes;

        SignatureExecuteNode(PanamaNFILanguage language, CachedSignatureInfo signatureInfo) {
            super(language);
            this.signatureInfo = signatureInfo;

            PanamaType[] argTypes = signatureInfo.getArgTypes();
            this.argNodes = new ArgumentNode[argTypes.length];
            for (int i = 0; i < argTypes.length; i++) {
                argNodes[i] = argTypes[i].createArgumentNode();
            }
        }

        @Override
        public abstract Object execute(VirtualFrame frame);

        @SuppressWarnings("preview")
        MemorySegment getAddress(VirtualFrame frame) {
            return MemorySegment.ofAddress((long) frame.getArguments()[0]);
        }

        Object[] getArgs(VirtualFrame frame) {
            return (Object[]) frame.getArguments()[1];
        }

        PanamaSignature getSig(VirtualFrame frame) {
            return (PanamaSignature) frame.getArguments()[2];
        }

        @Specialization
        @ExplodeLoop
        public Object doGeneric(VirtualFrame frame) {
            Object[] args = getArgs(frame);
            @SuppressWarnings("preview")
            MemorySegment address = getAddress(frame);
            PanamaSignature signature = getSig(frame);

            if (args.length != argNodes.length) {
                throw silenceException(RuntimeException.class, ArityException.create(argNodes.length, argNodes.length, args.length));
            }

            try {
                PanamaType[] types = signatureInfo.getArgTypes();
                assert argNodes.length == types.length;

                for (int i = 0; i < argNodes.length; i++) {
                    args[i] = argNodes[i].execute(args[i]);
                }
            } catch (UnsupportedTypeException ex) {
                throw silenceException(RuntimeException.class, ex);
            }

            Object ret = signatureInfo.execute(signature, args, address);
            PanamaNFILanguage.get(this).errorContext.get().handleThrowables();
            return ret;
        }

        @SuppressWarnings({"unchecked"})
        static  RuntimeException silenceException(Class type, Exception ex) throws E {
            throw (E) ex;
        }
    }
}