/*
* Copyright (c) 1999, 2014, 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
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*/
package com.sun.tools.javac.code;
import com.sun.source.tree.Tree.Kind;
import javax.lang.model.type.TypeKind;
import static com.sun.tools.javac.code.TypeTag.NumericClasses.*;
/** An interface for type tag values, which distinguish between different
* sorts of types.
*
* <p><b>This is NOT part of any supported API.
* If you write code that depends on this, you do so at your own risk.
* This code and its internal interfaces are subject to change or
* deletion without notice.</b>
*/
public enum TypeTag {
/** The tag of the basic type `byte'.
*/
BYTE(BYTE_CLASS, BYTE_SUPERCLASSES, true),
/** The tag of the basic type `char'.
*/
CHAR(CHAR_CLASS, CHAR_SUPERCLASSES, true),
/** The tag of the basic type `short'.
*/
SHORT(SHORT_CLASS, SHORT_SUPERCLASSES, true),
/** The tag of the basic type `long'.
*/
LONG(LONG_CLASS, LONG_SUPERCLASSES, true),
/** The tag of the basic type `float'.
*/
FLOAT(FLOAT_CLASS, FLOAT_SUPERCLASSES, true),
/** The tag of the basic type `int'.
*/
INT(INT_CLASS, INT_SUPERCLASSES, true),
/** The tag of the basic type `double'.
*/
DOUBLE(DOUBLE_CLASS, DOUBLE_CLASS, true),
/** The tag of the basic type `boolean'.
*/
BOOLEAN(0, 0, true),
/** The tag of the type `void'.
*/
VOID,
/** The tag of all class and interface types.
*/
CLASS,
/** The tag of all array types.
*/
ARRAY,
/** The tag of all (monomorphic) method types.
*/
METHOD,
/** The tag of all package "types".
*/
PACKAGE,
/** The tag of all module "types".
*/
MODULE,
/** The tag of all (source-level) type variables.
*/
TYPEVAR,
/** The tag of all type arguments.
*/
WILDCARD,
/** The tag of all polymorphic (method-) types.
*/
FORALL,
/** The tag of deferred expression types in method context
*/
DEFERRED,
/** The tag of the bottom type {@code <null>}.
*/
BOT,
/** The tag of a missing type.
*/
NONE,
/** The tag of the error type.
*/
ERROR,
/** The tag of an unknown type
*/
UNKNOWN,
/** The tag of all instantiatable type variables.
*/
UNDETVAR,
/** Pseudo-types, these are special tags
*/
UNINITIALIZED_THIS,
UNINITIALIZED_OBJECT;
final int superClasses;
final int numericClass;
final boolean isPrimitive;
private TypeTag() {
this(0, 0, false);
}
private TypeTag(int numericClass, int superClasses, boolean isPrimitive) {
this.superClasses = superClasses;
this.numericClass = numericClass;
this.isPrimitive = isPrimitive;
}
public static class NumericClasses {
public static final int BYTE_CLASS = 1;
public static final int CHAR_CLASS = 2;
public static final int SHORT_CLASS = 4;
public static final int INT_CLASS = 8;
public static final int LONG_CLASS = 16;
public static final int FLOAT_CLASS = 32;
public static final int DOUBLE_CLASS = 64;
static final int BYTE_SUPERCLASSES = BYTE_CLASS | SHORT_CLASS | INT_CLASS |
LONG_CLASS | FLOAT_CLASS | DOUBLE_CLASS;
static final int CHAR_SUPERCLASSES = CHAR_CLASS | INT_CLASS |
LONG_CLASS | FLOAT_CLASS | DOUBLE_CLASS;
static final int SHORT_SUPERCLASSES = SHORT_CLASS | INT_CLASS |
LONG_CLASS | FLOAT_CLASS | DOUBLE_CLASS;
static final int INT_SUPERCLASSES = INT_CLASS | LONG_CLASS | FLOAT_CLASS | DOUBLE_CLASS;
static final int LONG_SUPERCLASSES = LONG_CLASS | FLOAT_CLASS | DOUBLE_CLASS;
static final int FLOAT_SUPERCLASSES = FLOAT_CLASS | DOUBLE_CLASS;
}
public boolean isStrictSubRangeOf(TypeTag tag) {
/* Please don't change the implementation of this method to call method
* isSubRangeOf. Both methods are called from hotspot code, the current
* implementation is better performance-wise than the commented modification.
*/
return (this.superClasses & tag.numericClass) != 0 && this != tag;
}
public boolean isSubRangeOf(TypeTag tag) {
return (this.superClasses & tag.numericClass) != 0;
}
/** Returns the number of type tags.
*/
public static int getTypeTagCount() {
// last two tags are not included in the total as long as they are pseudo-types
return (UNDETVAR.ordinal() + 1);
}
public Kind getKindLiteral() {
switch (this) {
case INT:
return Kind.INT_LITERAL;
case LONG:
return Kind.LONG_LITERAL;
case FLOAT:
return Kind.FLOAT_LITERAL;
case DOUBLE:
return Kind.DOUBLE_LITERAL;
case BOOLEAN:
return Kind.BOOLEAN_LITERAL;
case CHAR:
return Kind.CHAR_LITERAL;
case CLASS:
return Kind.STRING_LITERAL;
case BOT:
return Kind.NULL_LITERAL;
default:
throw new AssertionError("unknown literal kind " + this);
}
}
public TypeKind getPrimitiveTypeKind() {
switch (this) {
case BOOLEAN:
return TypeKind.BOOLEAN;
case BYTE:
return TypeKind.BYTE;
case SHORT:
return TypeKind.SHORT;
case INT:
return TypeKind.INT;
case LONG:
return TypeKind.LONG;
case CHAR:
return TypeKind.CHAR;
case FLOAT:
return TypeKind.FLOAT;
case DOUBLE:
return TypeKind.DOUBLE;
case VOID:
return TypeKind.VOID;
default:
throw new AssertionError("unknown primitive type " + this);
}
}
}