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/*
 * Copyright (c) 2012, 2022, 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
 * derivative works of, display, perform, and distribute the Software and make,
 * use, sell, offer for sale, import, export, have made, and have sold the
 * Software and the Larger Work(s), and to sublicense the foregoing rights on
 * either these or other terms.
 *
 * This license is subject to the following condition:
 *
 * 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
 * portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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package com.oracle.truffle.sl.nodes;

import java.util.Collections;
import java.util.Map;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.RootCallTarget;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.DirectCallNode;
import com.oracle.truffle.api.nodes.RootNode;
import com.oracle.truffle.api.strings.TruffleString;
import com.oracle.truffle.sl.SLLanguage;
import com.oracle.truffle.sl.runtime.SLContext;
import com.oracle.truffle.sl.runtime.SLNull;
import com.oracle.truffle.sl.runtime.SLStrings;

/**
 * This class performs two additional tasks:
 *
 * 
    *
  • Lazily registration of functions on first execution. This fulfills the semantics of * "evaluating" source code in SL.
  • *
  • Conversion of arguments to types understood by SL. The SL source code can be evaluated from a * different language, i.e., the caller can be a node from a different language that uses types not * understood by SL.
  • *
*/ public final class SLEvalRootNode extends RootNode { private static final TruffleString ROOT_EVAL = SLStrings.constant("root eval"); private final Map functions; @CompilationFinal private boolean registered; @Child private DirectCallNode mainCallNode; private final SLLanguage language; public SLEvalRootNode(SLLanguage language, RootCallTarget rootFunction, Map functions) { super(language); this.language = language; this.functions = Collections.unmodifiableMap(functions); this.mainCallNode = rootFunction != null ? DirectCallNode.create(rootFunction) : null; } @Override public boolean isInternal() { return true; } @Override protected boolean isInstrumentable() { return false; } @Override public String getName() { return ROOT_EVAL.toJavaStringUncached(); } public static TruffleString getTSName() { return ROOT_EVAL; } @Override public String toString() { return getName(); } @Override public Object execute(VirtualFrame frame) { if (language.isSingleContext()) { /* * Lazy registrations of functions on first execution. This optimization only works in * the single context case. Otherwise function registration needs to be repeated for * every context on first execute. */ if (!registered) { /* Function registration is a slow-path operation that must not be compiled. */ CompilerDirectives.transferToInterpreterAndInvalidate(); registerFunctions(); registered = true; } } else { /* * In the multi context case we always want to ensure that functions are registered. The * multi-context case is initialized with SLLanguage#initializeMultipleContexts. That * typically happens when a polyglot Context was created with an explicit Engine or if * an internal context was created. See Context.Builder#engine for details. */ registerFunctions(); } if (mainCallNode == null) { /* The source code did not have a "main" function, so nothing to execute. */ return SLNull.SINGLETON; } else { /* Conversion of arguments to types understood by SL. */ Object[] arguments = frame.getArguments(); for (int i = 0; i < arguments.length; i++) { arguments[i] = SLContext.fromForeignValue(arguments[i]); } return mainCallNode.call(arguments); } } @TruffleBoundary private void registerFunctions() { SLContext.get(this).getFunctionRegistry().register(functions); } }




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