1 /*
   2  * Copyright (c) 2011, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package org.graalvm.compiler.api.replacements;
  24 
  25 import java.lang.annotation.ElementType;
  26 import java.lang.annotation.Retention;
  27 import java.lang.annotation.RetentionPolicy;
  28 import java.lang.annotation.Target;
  29 
  30 /**
  31  * A snippet is a Graal graph expressed as a Java source method. Snippets are used for lowering
  32  * nodes that have runtime dependent semantics (e.g. the {@code CHECKCAST} bytecode).
  33  */
  34 @Retention(RetentionPolicy.RUNTIME)
  35 @Target(ElementType.METHOD)
  36 public @interface Snippet {
  37 
  38     /**
  39      * Denotes a snippet parameter representing 0 or more arguments that will be bound during
  40      * snippet template instantiation. During snippet template creation, its value must be an array
  41      * whose length specifies the number of arguments (the contents of the array are ignored) bound
  42      * to the parameter during instantiation.
  43      */
  44     @Retention(RetentionPolicy.RUNTIME)
  45     @Target(ElementType.PARAMETER)
  46     public @interface VarargsParameter {
  47     }
  48 
  49     /**
  50      * Denotes a snippet parameter that will bound to a constant value during snippet template
  51      * instantiation.
  52      */
  53     @Retention(RetentionPolicy.RUNTIME)
  54     @Target(ElementType.PARAMETER)
  55     public @interface ConstantParameter {
  56     }
  57 
  58     /**
  59      * Denotes a snippet parameter that will bound to a non-null value during snippet template
  60      * instantiation.
  61      */
  62     @Retention(RetentionPolicy.RUNTIME)
  63     @Target(ElementType.PARAMETER)
  64     public @interface NonNullParameter {
  65     }
  66 }