185 lines
7.3 KiB
Java
185 lines
7.3 KiB
Java
/******************************************************************************
|
|
* Copyright (c) 2002 - 2014 IBM Corporation.
|
|
* All rights reserved. This program and the accompanying materials
|
|
* are made available under the terms of the Eclipse Public License v1.0
|
|
* which accompanies this distribution, and is available at
|
|
* http://www.eclipse.org/legal/epl-v10.html
|
|
*
|
|
* Contributors:
|
|
* IBM Corporation - initial API and implementation
|
|
*****************************************************************************/
|
|
|
|
/*
|
|
* Copyright (c) 2013,
|
|
* Tobias Blaschke <code@tobiasblaschke.de>
|
|
* All rights reserved.
|
|
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are met:
|
|
*
|
|
* 1. Redistributions of source code must retain the above copyright notice,
|
|
* this list of conditions and the following disclaimer.
|
|
*
|
|
* 2. Redistributions in binary form must reproduce the above copyright notice,
|
|
* this list of conditions and the following disclaimer in the documentation
|
|
* and/or other materials provided with the distribution.
|
|
*
|
|
* 3. The names of the contributors may not be used to endorse or promote
|
|
* products derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
|
|
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
|
|
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
package com.ibm.wala.util;
|
|
|
|
import java.util.EnumMap;
|
|
import java.util.HashMap;
|
|
import java.util.Map;
|
|
|
|
import com.ibm.wala.types.TypeName;
|
|
import com.ibm.wala.types.TypeReference;
|
|
|
|
/**
|
|
* Offers checks like ClassHierarchy.isAssignable but for primitives.
|
|
*
|
|
* This Class does not consider Boxing / Unboxing
|
|
*
|
|
* @author Tobias Blaschke <code@tobiasblaschke.de>
|
|
* @since 2013-11-21
|
|
*/
|
|
public class PrimitiveAssignability {
|
|
public static enum AssignabilityKind {
|
|
IDENTITY,
|
|
WIDENING,
|
|
NARROWING,
|
|
WIDENING_NARROWING,
|
|
UNASSIGNABLE
|
|
}
|
|
|
|
private static enum Primitive {
|
|
BOOLEAN,
|
|
CHAR,
|
|
BYTE,
|
|
SHORT,
|
|
INT,
|
|
LONG,
|
|
FLOAT,
|
|
DOUBLE
|
|
}
|
|
|
|
private static final Map<Primitive, Map<Primitive, AssignabilityKind>> assignability =
|
|
new EnumMap<>(Primitive.class);
|
|
|
|
static {
|
|
// fill assignability
|
|
|
|
for (final Primitive t : Primitive.values()) {
|
|
final Map<Primitive, AssignabilityKind> addendum = new EnumMap<>(Primitive.class);
|
|
addendum.put(t, AssignabilityKind.IDENTITY);
|
|
assignability.put(t, addendum);
|
|
}
|
|
|
|
putWidening(Primitive.BYTE, Primitive.SHORT);
|
|
putWidening(Primitive.BYTE, Primitive.INT);
|
|
putWidening(Primitive.BYTE, Primitive.LONG);
|
|
putWidening(Primitive.BYTE, Primitive.FLOAT);
|
|
putWidening(Primitive.BYTE, Primitive.DOUBLE);
|
|
putWidening(Primitive.SHORT, Primitive.INT);
|
|
putWidening(Primitive.SHORT, Primitive.LONG);
|
|
putWidening(Primitive.SHORT, Primitive.FLOAT);
|
|
putWidening(Primitive.SHORT, Primitive.DOUBLE);
|
|
putWidening(Primitive.CHAR, Primitive.INT);
|
|
putWidening(Primitive.CHAR, Primitive.LONG);
|
|
putWidening(Primitive.CHAR, Primitive.FLOAT);
|
|
putWidening(Primitive.CHAR, Primitive.DOUBLE);
|
|
putWidening(Primitive.INT, Primitive.LONG);
|
|
putWidening(Primitive.INT, Primitive.FLOAT);
|
|
putWidening(Primitive.INT, Primitive.DOUBLE);
|
|
putWidening(Primitive.LONG, Primitive.FLOAT);
|
|
putWidening(Primitive.LONG, Primitive.DOUBLE);
|
|
putWidening(Primitive.FLOAT, Primitive.DOUBLE);
|
|
|
|
putNarrowing(Primitive.SHORT, Primitive.BYTE);
|
|
putNarrowing(Primitive.SHORT, Primitive.CHAR);
|
|
putNarrowing(Primitive.CHAR, Primitive.BYTE);
|
|
putNarrowing(Primitive.CHAR, Primitive.SHORT);
|
|
putNarrowing(Primitive.INT, Primitive.BYTE);
|
|
putNarrowing(Primitive.INT, Primitive.SHORT);
|
|
putNarrowing(Primitive.INT, Primitive.CHAR);
|
|
putNarrowing(Primitive.LONG, Primitive.BYTE);
|
|
putNarrowing(Primitive.LONG, Primitive.SHORT);
|
|
putNarrowing(Primitive.LONG, Primitive.CHAR);
|
|
putNarrowing(Primitive.LONG, Primitive.INT);
|
|
putNarrowing(Primitive.FLOAT, Primitive.BYTE);
|
|
putNarrowing(Primitive.FLOAT, Primitive.SHORT);
|
|
putNarrowing(Primitive.FLOAT, Primitive.CHAR);
|
|
putNarrowing(Primitive.FLOAT, Primitive.INT);
|
|
putNarrowing(Primitive.FLOAT, Primitive.LONG);
|
|
putNarrowing(Primitive.DOUBLE, Primitive.BYTE);
|
|
putNarrowing(Primitive.DOUBLE, Primitive.SHORT);
|
|
putNarrowing(Primitive.DOUBLE, Primitive.CHAR);
|
|
putNarrowing(Primitive.DOUBLE, Primitive.INT);
|
|
putNarrowing(Primitive.DOUBLE, Primitive.LONG);
|
|
putNarrowing(Primitive.DOUBLE, Primitive.FLOAT);
|
|
|
|
assignability.get(Primitive.BYTE).put(Primitive.CHAR, AssignabilityKind.WIDENING_NARROWING);
|
|
}
|
|
|
|
private static void putNarrowing(final Primitive from, final Primitive to) {
|
|
assert (! assignability.get(from).containsKey(to));
|
|
assignability.get(from).put(to, AssignabilityKind.NARROWING);
|
|
}
|
|
|
|
private static void putWidening(final Primitive from, final Primitive to) {
|
|
assert (! assignability.get(from).containsKey(to));
|
|
assignability.get(from).put(to, AssignabilityKind.WIDENING);
|
|
}
|
|
|
|
private static final Map<TypeName, Primitive> namePrimitiveMap = new HashMap<>();
|
|
|
|
static {
|
|
// fill namePrimitiveMap
|
|
namePrimitiveMap.put(TypeReference.BooleanName, Primitive.BOOLEAN);
|
|
namePrimitiveMap.put(TypeReference.ByteName, Primitive.BYTE);
|
|
namePrimitiveMap.put(TypeReference.CharName, Primitive.CHAR);
|
|
namePrimitiveMap.put(TypeReference.DoubleName, Primitive.DOUBLE);
|
|
namePrimitiveMap.put(TypeReference.FloatName, Primitive.FLOAT);
|
|
namePrimitiveMap.put(TypeReference.IntName, Primitive.INT);
|
|
namePrimitiveMap.put(TypeReference.LongName, Primitive.LONG);
|
|
namePrimitiveMap.put(TypeReference.ShortName, Primitive.SHORT);
|
|
}
|
|
|
|
/**
|
|
* Is information lost on c1 x := c2 y?
|
|
*/
|
|
public static AssignabilityKind getAssignableFrom(TypeName from, TypeName to) {
|
|
final Primitive f = namePrimitiveMap.get(from);
|
|
final Primitive t = namePrimitiveMap.get(to);
|
|
|
|
if (assignability.get(f).containsKey(t)) {
|
|
return assignability.get(f).get(t);
|
|
} else {
|
|
return AssignabilityKind.UNASSIGNABLE;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Does an expression c1 x := c2 y typecheck?
|
|
*/
|
|
public static boolean isAssignableFrom(TypeName from, TypeName to) {
|
|
return getAssignableFrom(from, to) != AssignabilityKind.UNASSIGNABLE;
|
|
}
|
|
|
|
|
|
}
|