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The GraalVM compiler and the Graal-truffle optimizer.
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/*
 * Copyright (c) 2011, 2018, 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
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
package jdk.graal.compiler.nodeinfo;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.TYPE)
public @interface NodeInfo {

    String shortName() default "";

    /**
     * The template used to build the {@link Verbosity#Name} version. Variable part are specified
     * using {i#inputName} or {p#propertyName}.
     */
    String nameTemplate() default "";

    InputType[] allowedUsageTypes() default {};

    /**
     * An estimation of the number of CPU cycles needed to execute this node that can be used to
     * compare its execution cost against other nodes.
     *
     * Implementations of graph cost models based on this value might throw an exception if a node's
     * {@link NodeCycles} value is {@link NodeCycles#CYCLES_UNSET}. As such, it is recommended to
     * specify a value for nodes likely to be inputs to a graph cost model.
     */
    NodeCycles cycles() default NodeCycles.CYCLES_UNSET;

    /**
     * A rationale for the chosen {@link NodeInfo#cycles()} value.
     */
    String cyclesRationale() default "";

    /**
     * An estimation of the code size needed to represent this node in machine code that can be used
     * to compare its size cost against other nodes.
     *
     * Implementations of graph cost models based on this value might throw an exception if a node's
     * {@link NodeSize} value is {@link NodeSize#SIZE_UNSET}. As such, it is recommended to specify
     * a value for nodes likely to be inputs to a graph cost model.
     */
    NodeSize size() default NodeSize.SIZE_UNSET;

    /**
     * A rationale for the chosen {@link NodeInfo#size()} value.
     */
    String sizeRationale() default "";
}