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 Wed Apr 27 01:34:52 2016 +0800
1.3 @@ -0,0 +1,240 @@
1.4 +/*
1.5 + * Copyright (c) 1999, 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.source.tree.Tree.Kind;
1.32 +
1.33 +import javax.lang.model.type.TypeKind;
1.34 +
1.35 +import static com.sun.tools.javac.code.TypeTag.NumericClasses.*;
1.36 +
1.37 +/** An interface for type tag values, which distinguish between different
1.38 + * sorts of types.
1.39 + *
1.40 + * <p><b>This is NOT part of any supported API.
1.41 + * If you write code that depends on this, you do so at your own risk.
1.42 + * This code and its internal interfaces are subject to change or
1.43 + * deletion without notice.</b>
1.44 + */
1.45 +public enum TypeTag {
1.46 + /** The tag of the basic type `byte'.
1.47 + */
1.48 + BYTE(BYTE_CLASS, BYTE_SUPERCLASSES, true),
1.49 +
1.50 + /** The tag of the basic type `char'.
1.51 + */
1.52 + CHAR(CHAR_CLASS, CHAR_SUPERCLASSES, true),
1.53 +
1.54 + /** The tag of the basic type `short'.
1.55 + */
1.56 + SHORT(SHORT_CLASS, SHORT_SUPERCLASSES, true),
1.57 +
1.58 + /** The tag of the basic type `long'.
1.59 + */
1.60 + LONG(LONG_CLASS, LONG_SUPERCLASSES, true),
1.61 +
1.62 + /** The tag of the basic type `float'.
1.63 + */
1.64 + FLOAT(FLOAT_CLASS, FLOAT_SUPERCLASSES, true),
1.65 + /** The tag of the basic type `int'.
1.66 + */
1.67 + INT(INT_CLASS, INT_SUPERCLASSES, true),
1.68 + /** The tag of the basic type `double'.
1.69 + */
1.70 + DOUBLE(DOUBLE_CLASS, DOUBLE_CLASS, true),
1.71 + /** The tag of the basic type `boolean'.
1.72 + */
1.73 + BOOLEAN(0, 0, true),
1.74 +
1.75 + /** The tag of the type `void'.
1.76 + */
1.77 + VOID,
1.78 +
1.79 + /** The tag of all class and interface types.
1.80 + */
1.81 + CLASS,
1.82 +
1.83 + /** The tag of all array types.
1.84 + */
1.85 + ARRAY,
1.86 +
1.87 + /** The tag of all (monomorphic) method types.
1.88 + */
1.89 + METHOD,
1.90 +
1.91 + /** The tag of all package "types".
1.92 + */
1.93 + PACKAGE,
1.94 +
1.95 + /** The tag of all (source-level) type variables.
1.96 + */
1.97 + TYPEVAR,
1.98 +
1.99 + /** The tag of all type arguments.
1.100 + */
1.101 + WILDCARD,
1.102 +
1.103 + /** The tag of all polymorphic (method-) types.
1.104 + */
1.105 + FORALL,
1.106 +
1.107 + /** The tag of deferred expression types in method context
1.108 + */
1.109 + DEFERRED,
1.110 +
1.111 + /** The tag of the bottom type {@code <null>}.
1.112 + */
1.113 + BOT,
1.114 +
1.115 + /** The tag of a missing type.
1.116 + */
1.117 + NONE,
1.118 +
1.119 + /** The tag of the error type.
1.120 + */
1.121 + ERROR,
1.122 +
1.123 + /** The tag of an unknown type
1.124 + */
1.125 + UNKNOWN,
1.126 +
1.127 + /** The tag of all instantiatable type variables.
1.128 + */
1.129 + UNDETVAR,
1.130 +
1.131 + /** Pseudo-types, these are special tags
1.132 + */
1.133 + UNINITIALIZED_THIS,
1.134 +
1.135 + UNINITIALIZED_OBJECT;
1.136 +
1.137 + final int superClasses;
1.138 + final int numericClass;
1.139 + final boolean isPrimitive;
1.140 +
1.141 + private TypeTag() {
1.142 + this(0, 0, false);
1.143 + }
1.144 +
1.145 + private TypeTag(int numericClass, int superClasses, boolean isPrimitive) {
1.146 + this.superClasses = superClasses;
1.147 + this.numericClass = numericClass;
1.148 + this.isPrimitive = isPrimitive;
1.149 + }
1.150 +
1.151 + public static class NumericClasses {
1.152 + public static final int BYTE_CLASS = 1;
1.153 + public static final int CHAR_CLASS = 2;
1.154 + public static final int SHORT_CLASS = 4;
1.155 + public static final int INT_CLASS = 8;
1.156 + public static final int LONG_CLASS = 16;
1.157 + public static final int FLOAT_CLASS = 32;
1.158 + public static final int DOUBLE_CLASS = 64;
1.159 +
1.160 + static final int BYTE_SUPERCLASSES = BYTE_CLASS | SHORT_CLASS | INT_CLASS |
1.161 + LONG_CLASS | FLOAT_CLASS | DOUBLE_CLASS;
1.162 +
1.163 + static final int CHAR_SUPERCLASSES = CHAR_CLASS | INT_CLASS |
1.164 + LONG_CLASS | FLOAT_CLASS | DOUBLE_CLASS;
1.165 +
1.166 + static final int SHORT_SUPERCLASSES = SHORT_CLASS | INT_CLASS |
1.167 + LONG_CLASS | FLOAT_CLASS | DOUBLE_CLASS;
1.168 +
1.169 + static final int INT_SUPERCLASSES = INT_CLASS | LONG_CLASS | FLOAT_CLASS | DOUBLE_CLASS;
1.170 +
1.171 + static final int LONG_SUPERCLASSES = LONG_CLASS | FLOAT_CLASS | DOUBLE_CLASS;
1.172 +
1.173 + static final int FLOAT_SUPERCLASSES = FLOAT_CLASS | DOUBLE_CLASS;
1.174 + }
1.175 +
1.176 + public boolean isStrictSubRangeOf(TypeTag tag) {
1.177 + /* Please don't change the implementation of this method to call method
1.178 + * isSubRangeOf. Both methods are called from hotspot code, the current
1.179 + * implementation is better performance-wise than the commented modification.
1.180 + */
1.181 + return (this.superClasses & tag.numericClass) != 0 && this != tag;
1.182 + }
1.183 +
1.184 + public boolean isSubRangeOf(TypeTag tag) {
1.185 + return (this.superClasses & tag.numericClass) != 0;
1.186 + }
1.187 +
1.188 + /** Returns the number of type tags.
1.189 + */
1.190 + public static int getTypeTagCount() {
1.191 + // last two tags are not included in the total as long as they are pseudo-types
1.192 + return (UNDETVAR.ordinal() + 1);
1.193 + }
1.194 +
1.195 + public Kind getKindLiteral() {
1.196 + switch (this) {
1.197 + case INT:
1.198 + return Kind.INT_LITERAL;
1.199 + case LONG:
1.200 + return Kind.LONG_LITERAL;
1.201 + case FLOAT:
1.202 + return Kind.FLOAT_LITERAL;
1.203 + case DOUBLE:
1.204 + return Kind.DOUBLE_LITERAL;
1.205 + case BOOLEAN:
1.206 + return Kind.BOOLEAN_LITERAL;
1.207 + case CHAR:
1.208 + return Kind.CHAR_LITERAL;
1.209 + case CLASS:
1.210 + return Kind.STRING_LITERAL;
1.211 + case BOT:
1.212 + return Kind.NULL_LITERAL;
1.213 + default:
1.214 + throw new AssertionError("unknown literal kind " + this);
1.215 + }
1.216 + }
1.217 +
1.218 + public TypeKind getPrimitiveTypeKind() {
1.219 + switch (this) {
1.220 + case BOOLEAN:
1.221 + return TypeKind.BOOLEAN;
1.222 + case BYTE:
1.223 + return TypeKind.BYTE;
1.224 + case SHORT:
1.225 + return TypeKind.SHORT;
1.226 + case INT:
1.227 + return TypeKind.INT;
1.228 + case LONG:
1.229 + return TypeKind.LONG;
1.230 + case CHAR:
1.231 + return TypeKind.CHAR;
1.232 + case FLOAT:
1.233 + return TypeKind.FLOAT;
1.234 + case DOUBLE:
1.235 + return TypeKind.DOUBLE;
1.236 + case VOID:
1.237 + return TypeKind.VOID;
1.238 + default:
1.239 + throw new AssertionError("unknown primitive type " + this);
1.240 + }
1.241 + }
1.242 +
1.243 +}
