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Truffle SL is an example language implemented using the Truffle API.
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package com.oracle.truffle.sl.nodes.expression;

import com.oracle.truffle.api.CompilerDirectives;
import com.oracle.truffle.api.CompilerDirectives.CompilationFinal;
import com.oracle.truffle.api.dsl.GeneratedBy;
import com.oracle.truffle.api.dsl.UnsupportedSpecializationException;
import com.oracle.truffle.api.frame.VirtualFrame;
import com.oracle.truffle.api.nodes.Node;
import com.oracle.truffle.api.nodes.NodeCost;
import com.oracle.truffle.api.nodes.UnexpectedResultException;
import com.oracle.truffle.sl.nodes.SLExpressionNode;

@GeneratedBy(SLLogicalAndNode.class)
public final class SLLogicalAndNodeGen extends SLLogicalAndNode {

    @Child private SLExpressionNode leftNode_;
    @Child private SLExpressionNode rightNode_;
    @CompilationFinal private boolean seenUnsupported0;

    private SLLogicalAndNodeGen(SLExpressionNode leftNode, SLExpressionNode rightNode) {
        this.leftNode_ = leftNode;
        this.rightNode_ = rightNode;
    }

    @Override
    public NodeCost getCost() {
        return NodeCost.MONOMORPHIC;
    }

    @Override
    public Object executeGeneric(VirtualFrame frameValue) {
        return executeBoolean(frameValue);
    }

    @Override
    public boolean executeBoolean(VirtualFrame frameValue) {
        boolean leftNodeValue_;
        try {
            leftNodeValue_ = leftNode_.executeBoolean(frameValue);
        } catch (UnexpectedResultException ex) {
            boolean hasRightNodeValue = this.needsRightNode(ex.getResult());
            Object rightNodeValue = null;
            if (hasRightNodeValue) {
                rightNodeValue = rightNode_.executeGeneric(frameValue);
            }
            throw unsupported(ex.getResult(), hasRightNodeValue, rightNodeValue);
        }
        boolean hasRightNodeValue = this.needsRightNode(leftNodeValue_);
        boolean rightNodeValue_ = false;
        if (hasRightNodeValue) {
            try {
                rightNodeValue_ = rightNode_.executeBoolean(frameValue);
            } catch (UnexpectedResultException ex) {
                throw unsupported(leftNodeValue_, hasRightNodeValue, ex.getResult());
            }
        }
        return this.doBoolean(leftNodeValue_, hasRightNodeValue, rightNodeValue_);
    }

    @Override
    public void executeVoid(VirtualFrame frameValue) {
        executeBoolean(frameValue);
        return;
    }

    private UnsupportedSpecializationException unsupported(Object leftNodeValue, Object hasRightNodeValue, Object rightNodeValue) {
        if (!seenUnsupported0) {
            CompilerDirectives.transferToInterpreterAndInvalidate();
            seenUnsupported0 = true;
        }
        return new UnsupportedSpecializationException(this, new Node[] {leftNode_, null, rightNode_}, leftNodeValue, hasRightNodeValue, rightNodeValue);
    }

    public static SLLogicalAndNode create(SLExpressionNode leftNode, SLExpressionNode rightNode) {
        return new SLLogicalAndNodeGen(leftNode, rightNode);
    }

}