1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/classes/com/sun/tools/javac/code/TargetType.java Wed Apr 27 01:34:52 2016 +0800
1.3 @@ -0,0 +1,177 @@
1.4 +/*
1.5 + * Copyright (c) 2008, 2013, Oracle and/or its affiliates. All rights reserved.
1.6 + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
1.7 + *
1.8 + * This code is free software; you can redistribute it and/or modify it
1.9 + * under the terms of the GNU General Public License version 2 only, as
1.10 + * published by the Free Software Foundation. Oracle designates this
1.11 + * particular file as subject to the "Classpath" exception as provided
1.12 + * by Oracle in the LICENSE file that accompanied this code.
1.13 + *
1.14 + * This code is distributed in the hope that it will be useful, but WITHOUT
1.15 + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
1.16 + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
1.17 + * version 2 for more details (a copy is included in the LICENSE file that
1.18 + * accompanied this code).
1.19 + *
1.20 + * You should have received a copy of the GNU General Public License version
1.21 + * 2 along with this work; if not, write to the Free Software Foundation,
1.22 + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
1.23 + *
1.24 + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
1.25 + * or visit www.oracle.com if you need additional information or have any
1.26 + * questions.
1.27 + */
1.28 +
1.29 +package com.sun.tools.javac.code;
1.30 +
1.31 +import com.sun.tools.javac.util.Assert;
1.32 +
1.33 +/**
1.34 + * Describes the type of program element an extended annotation (or extended
1.35 + * compound attribute) targets.
1.36 + *
1.37 + * By comparison, a Tree.Kind has enum values for all elements in the AST, and
1.38 + * it does not provide enough resolution for type arguments (i.e., whether an
1.39 + * annotation targets a type argument in a local variable, method return type,
1.40 + * or a typecast).
1.41 + *
1.42 + * <p><b>This is NOT part of any supported API.
1.43 + * If you write code that depends on this, you do so at your own risk.
1.44 + * This code and its internal interfaces are subject to change or
1.45 + * deletion without notice.</b>
1.46 + */
1.47 +// Code duplicated in com.sun.tools.classfile.TypeAnnotation.TargetType
1.48 +public enum TargetType {
1.49 + /** For annotations on a class type parameter declaration. */
1.50 + CLASS_TYPE_PARAMETER(0x00),
1.51 +
1.52 + /** For annotations on a method type parameter declaration. */
1.53 + METHOD_TYPE_PARAMETER(0x01),
1.54 +
1.55 + /** For annotations on the type of an "extends" or "implements" clause. */
1.56 + CLASS_EXTENDS(0x10),
1.57 +
1.58 + /** For annotations on a bound of a type parameter of a class. */
1.59 + CLASS_TYPE_PARAMETER_BOUND(0x11),
1.60 +
1.61 + /** For annotations on a bound of a type parameter of a method. */
1.62 + METHOD_TYPE_PARAMETER_BOUND(0x12),
1.63 +
1.64 + /** For annotations on a field. */
1.65 + FIELD(0x13),
1.66 +
1.67 + /** For annotations on a method return type. */
1.68 + METHOD_RETURN(0x14),
1.69 +
1.70 + /** For annotations on the method receiver. */
1.71 + METHOD_RECEIVER(0x15),
1.72 +
1.73 + /** For annotations on a method parameter. */
1.74 + METHOD_FORMAL_PARAMETER(0x16),
1.75 +
1.76 + /** For annotations on a throws clause in a method declaration. */
1.77 + THROWS(0x17),
1.78 +
1.79 + /** For annotations on a local variable. */
1.80 + LOCAL_VARIABLE(0x40, true),
1.81 +
1.82 + /** For annotations on a resource variable. */
1.83 + RESOURCE_VARIABLE(0x41, true),
1.84 +
1.85 + /** For annotations on an exception parameter. */
1.86 + EXCEPTION_PARAMETER(0x42, true),
1.87 +
1.88 + /** For annotations on a type test. */
1.89 + INSTANCEOF(0x43, true),
1.90 +
1.91 + /** For annotations on an object creation expression. */
1.92 + NEW(0x44, true),
1.93 +
1.94 + /** For annotations on a constructor reference receiver. */
1.95 + CONSTRUCTOR_REFERENCE(0x45, true),
1.96 +
1.97 + /** For annotations on a method reference receiver. */
1.98 + METHOD_REFERENCE(0x46, true),
1.99 +
1.100 + /** For annotations on a typecast. */
1.101 + CAST(0x47, true),
1.102 +
1.103 + /** For annotations on a type argument of an object creation expression. */
1.104 + CONSTRUCTOR_INVOCATION_TYPE_ARGUMENT(0x48, true),
1.105 +
1.106 + /** For annotations on a type argument of a method call. */
1.107 + METHOD_INVOCATION_TYPE_ARGUMENT(0x49, true),
1.108 +
1.109 + /** For annotations on a type argument of a constructor reference. */
1.110 + CONSTRUCTOR_REFERENCE_TYPE_ARGUMENT(0x4A, true),
1.111 +
1.112 + /** For annotations on a type argument of a method reference. */
1.113 + METHOD_REFERENCE_TYPE_ARGUMENT(0x4B, true),
1.114 +
1.115 + /** For annotations with an unknown target. */
1.116 + UNKNOWN(0xFF);
1.117 +
1.118 + private static final int MAXIMUM_TARGET_TYPE_VALUE = 0x4B;
1.119 +
1.120 + private final int targetTypeValue;
1.121 + private final boolean isLocal;
1.122 +
1.123 + private TargetType(int targetTypeValue) {
1.124 + this(targetTypeValue, false);
1.125 + }
1.126 +
1.127 + private TargetType(int targetTypeValue, boolean isLocal) {
1.128 + if (targetTypeValue < 0
1.129 + || targetTypeValue > 255)
1.130 + Assert.error("Attribute type value needs to be an unsigned byte: " + String.format("0x%02X", targetTypeValue));
1.131 + this.targetTypeValue = targetTypeValue;
1.132 + this.isLocal = isLocal;
1.133 + }
1.134 +
1.135 + /**
1.136 + * Returns whether or not this TargetType represents an annotation whose
1.137 + * target is exclusively a tree in a method body
1.138 + *
1.139 + * Note: wildcard bound targets could target a local tree and a class
1.140 + * member declaration signature tree
1.141 + */
1.142 + public boolean isLocal() {
1.143 + return isLocal;
1.144 + }
1.145 +
1.146 + public int targetTypeValue() {
1.147 + return this.targetTypeValue;
1.148 + }
1.149 +
1.150 + private static final TargetType[] targets;
1.151 +
1.152 + static {
1.153 + targets = new TargetType[MAXIMUM_TARGET_TYPE_VALUE + 1];
1.154 + TargetType[] alltargets = values();
1.155 + for (TargetType target : alltargets) {
1.156 + if (target.targetTypeValue != UNKNOWN.targetTypeValue)
1.157 + targets[target.targetTypeValue] = target;
1.158 + }
1.159 + for (int i = 0; i <= MAXIMUM_TARGET_TYPE_VALUE; ++i) {
1.160 + if (targets[i] == null)
1.161 + targets[i] = UNKNOWN;
1.162 + }
1.163 + }
1.164 +
1.165 + public static boolean isValidTargetTypeValue(int tag) {
1.166 + if (tag == UNKNOWN.targetTypeValue)
1.167 + return true;
1.168 +
1.169 + return (tag >= 0 && tag < targets.length);
1.170 + }
1.171 +
1.172 + public static TargetType fromTargetTypeValue(int tag) {
1.173 + if (tag == UNKNOWN.targetTypeValue)
1.174 + return UNKNOWN;
1.175 +
1.176 + if (tag < 0 || tag >= targets.length)
1.177 + Assert.error("Unknown TargetType: " + tag);
1.178 + return targets[tag];
1.179 + }
1.180 +}
