SLBuiltinNode.java

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package com.oracle.truffle.sl.builtins;

import com.oracle.truffle.api.dsl.GenerateNodeFactory;
import com.oracle.truffle.api.dsl.NodeChild;
import com.oracle.truffle.api.dsl.NodeField;
import com.oracle.truffle.sl.SLLanguage;
import com.oracle.truffle.sl.nodes.SLExpressionNode;
import com.oracle.truffle.sl.runtime.SLContext;
import com.oracle.truffle.sl.runtime.SLFunctionRegistry;

/**
 * Base class for all builtin functions. It contains the Truffle DSL annotation {@link NodeChild}
 * that defines the function arguments.<br>
 * Builtin functions need access to the {@link SLContext}. Instead of defining a Java field manually
 * and setting it in a constructor, we use the Truffle DSL annotation {@link NodeField} that
 * generates the field and constructor automatically.
 * <p>
 * The builtin functions are registered in {@link SLContext#installBuiltins}. Every builtin node
 * subclass is instantiated there, wrapped into a function, and added to the
 * {@link SLFunctionRegistry}. This ensures that builtin functions can be called like user-defined
 * functions; there is no special function lookup or call node for builtin functions.
 */
@NodeChild(value = "arguments", type = SLExpressionNode[].class)
@GenerateNodeFactory
public abstract class SLBuiltinNode extends SLExpressionNode {

    /**
     * Accessor for the {@link SLContext}. The implementation of this method is generated
     * automatically based on the {@link NodeField} annotation on the class.
     */
    public final SLContext getContext() {
        return getRootNode().getLanguage(SLLanguage.class).getContextReference().get();
    }
}