1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/src/share/classes/com/sun/tools/javac/code/TypeTag.java Thu Oct 25 11:09:36 2012 -0700
1.3 @@ -0,0 +1,226 @@
1.4 +/*
1.5 + * Copyright (c) 1999, 2012, 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.source.tree.Tree.Kind;
1.32 +
1.33 +import javax.lang.model.type.TypeKind;
1.34 +
1.35 +/** An interface for type tag values, which distinguish between different
1.36 + * sorts of types.
1.37 + *
1.38 + * <p><b>This is NOT part of any supported API.
1.39 + * If you write code that depends on this, you do so at your own risk.
1.40 + * This code and its internal interfaces are subject to change or
1.41 + * deletion without notice.</b>
1.42 + */
1.43 +public enum TypeTag {
1.44 + /** The tag of the basic type `byte'.
1.45 + */
1.46 + BYTE(1),
1.47 +
1.48 + /** The tag of the basic type `char'.
1.49 + */
1.50 + CHAR(2),
1.51 +
1.52 + /** The tag of the basic type `short'.
1.53 + */
1.54 + SHORT(3),
1.55 +
1.56 + /** The tag of the basic type `int'.
1.57 + */
1.58 + INT(4),
1.59 +
1.60 + /** The tag of the basic type `long'.
1.61 + */
1.62 + LONG(5),
1.63 +
1.64 + /** The tag of the basic type `float'.
1.65 + */
1.66 + FLOAT(6),
1.67 +
1.68 + /** The tag of the basic type `double'.
1.69 + */
1.70 + DOUBLE(7),
1.71 +
1.72 + /** The tag of the basic type `boolean'.
1.73 + */
1.74 + BOOLEAN,
1.75 +
1.76 + /** The tag of the type `void'.
1.77 + */
1.78 + VOID,
1.79 +
1.80 + /** The tag of all class and interface types.
1.81 + */
1.82 + CLASS,
1.83 +
1.84 + /** The tag of all array types.
1.85 + */
1.86 + ARRAY,
1.87 +
1.88 + /** The tag of all (monomorphic) method types.
1.89 + */
1.90 + METHOD,
1.91 +
1.92 + /** The tag of all package "types".
1.93 + */
1.94 + PACKAGE,
1.95 +
1.96 + /** The tag of all (source-level) type variables.
1.97 + */
1.98 + TYPEVAR,
1.99 +
1.100 + /** The tag of all type arguments.
1.101 + */
1.102 + WILDCARD,
1.103 +
1.104 + /** The tag of all polymorphic (method-) types.
1.105 + */
1.106 + FORALL,
1.107 +
1.108 + /** The tag of deferred expression types in method context
1.109 + */
1.110 + DEFERRED,
1.111 +
1.112 + /** The tag of the bottom type <null>.
1.113 + */
1.114 + BOT,
1.115 +
1.116 + /** The tag of a missing type.
1.117 + */
1.118 + NONE,
1.119 +
1.120 + /** The tag of the error type.
1.121 + */
1.122 + ERROR,
1.123 +
1.124 + /** The tag of an unknown type
1.125 + */
1.126 + UNKNOWN,
1.127 +
1.128 + /** The tag of all instantiatable type variables.
1.129 + */
1.130 + UNDETVAR,
1.131 +
1.132 + /** Pseudo-types, these are special tags
1.133 + */
1.134 + UNINITIALIZED_THIS,
1.135 +
1.136 + UNINITIALIZED_OBJECT;
1.137 +
1.138 + /** This field will only be used for tags related with numeric types for
1.139 + * optimization reasons.
1.140 + */
1.141 + private int order = 0;
1.142 +
1.143 + private TypeTag() {}
1.144 +
1.145 + private TypeTag(int order) {
1.146 + this.order = order;
1.147 + }
1.148 +
1.149 + private static final int MIN_NUMERIC_TAG_ORDER = 1;
1.150 + private static final int MAX_NUMERIC_TAG_ORDER = 7;
1.151 +
1.152 + /** Returns the number of type tags.
1.153 + */
1.154 + public static int getTypeTagCount() {
1.155 + // last two tags are not included in the total as long as they are pseudo-types
1.156 + return (UNDETVAR.ordinal() + 1);
1.157 + }
1.158 +
1.159 + public boolean isSubRangeOf(TypeTag range) {
1.160 + return (this == range) || isStrictSubRangeOf(range);
1.161 + }
1.162 +
1.163 + public boolean isStrictSubRangeOf(TypeTag range) {
1.164 + if (this.order >= MIN_NUMERIC_TAG_ORDER && this.order <= MAX_NUMERIC_TAG_ORDER &&
1.165 + range.order >= MIN_NUMERIC_TAG_ORDER && this.order <= MAX_NUMERIC_TAG_ORDER) {
1.166 + if (this == range)
1.167 + return false;
1.168 + switch (this) {
1.169 + case BYTE:
1.170 + return true;
1.171 + case CHAR: case SHORT: case INT:
1.172 + case LONG: case FLOAT:
1.173 + return this.order < range.order && range.order <= MAX_NUMERIC_TAG_ORDER;
1.174 + default:
1.175 + return false;
1.176 + }
1.177 + }
1.178 + else
1.179 + return false;
1.180 + }
1.181 +
1.182 + public Kind getKindLiteral() {
1.183 + switch (this) {
1.184 + case INT:
1.185 + return Kind.INT_LITERAL;
1.186 + case LONG:
1.187 + return Kind.LONG_LITERAL;
1.188 + case FLOAT:
1.189 + return Kind.FLOAT_LITERAL;
1.190 + case DOUBLE:
1.191 + return Kind.DOUBLE_LITERAL;
1.192 + case BOOLEAN:
1.193 + return Kind.BOOLEAN_LITERAL;
1.194 + case CHAR:
1.195 + return Kind.CHAR_LITERAL;
1.196 + case CLASS:
1.197 + return Kind.STRING_LITERAL;
1.198 + case BOT:
1.199 + return Kind.NULL_LITERAL;
1.200 + default:
1.201 + throw new AssertionError("unknown literal kind " + this);
1.202 + }
1.203 + }
1.204 +
1.205 + public TypeKind getPrimitiveTypeKind() {
1.206 + switch (this) {
1.207 + case BOOLEAN:
1.208 + return TypeKind.BOOLEAN;
1.209 + case BYTE:
1.210 + return TypeKind.BYTE;
1.211 + case SHORT:
1.212 + return TypeKind.SHORT;
1.213 + case INT:
1.214 + return TypeKind.INT;
1.215 + case LONG:
1.216 + return TypeKind.LONG;
1.217 + case CHAR:
1.218 + return TypeKind.CHAR;
1.219 + case FLOAT:
1.220 + return TypeKind.FLOAT;
1.221 + case DOUBLE:
1.222 + return TypeKind.DOUBLE;
1.223 + case VOID:
1.224 + return TypeKind.VOID;
1.225 + default:
1.226 + throw new AssertionError("unknown primitive type " + this);
1.227 + }
1.228 + }
1.229 +}
