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// ASM: a very small and fast Java bytecode manipulation framework
// Copyright (c) 2000-2011 INRIA, France Telecom
// 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. Neither the name of the copyright holders nor the names of its
// contributors may 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 org.objectweb.asm.tree.analysis;
import org.objectweb.asm.Type;
/**
* A {@link Value} that is represented with its type in a seven types type system. This type system
* distinguishes the UNINITIALZED, INT, FLOAT, LONG, DOUBLE, REFERENCE and RETURNADDRESS types.
*
* @author Eric Bruneton
*/
public class BasicValue implements Value {
/** An uninitialized value. */
public static final BasicValue UNINITIALIZED_VALUE = new BasicValue(null);
/** A byte, boolean, char, short, or int value. */
public static final BasicValue INT_VALUE = new BasicValue(Type.INT_TYPE);
/** A float value. */
public static final BasicValue FLOAT_VALUE = new BasicValue(Type.FLOAT_TYPE);
/** A long value. */
public static final BasicValue LONG_VALUE = new BasicValue(Type.LONG_TYPE);
/** A double value. */
public static final BasicValue DOUBLE_VALUE = new BasicValue(Type.DOUBLE_TYPE);
/** An object or array reference value. */
public static final BasicValue REFERENCE_VALUE =
new BasicValue(Type.getObjectType("java/lang/Object"));
/** A return address value (produced by a jsr instruction). */
public static final BasicValue RETURNADDRESS_VALUE = new BasicValue(Type.VOID_TYPE);
/** The {@link Type} of this value, or null for uninitialized values. */
private final Type type;
/**
* Constructs a new {@link BasicValue} of the given type.
*
* @param type the value type.
*/
public BasicValue(final Type type) {
this.type = type;
}
/**
* Returns the {@link Type} of this value.
*
* @return the {@link Type} of this value.
*/
public Type getType() {
return type;
}
public int getSize() {
return type == Type.LONG_TYPE || type == Type.DOUBLE_TYPE ? 2 : 1;
}
/**
* Returns whether this value corresponds to an object or array reference.
*
* @return whether this value corresponds to an object or array reference.
*/
public boolean isReference() {
return type != null && (type.getSort() == Type.OBJECT || type.getSort() == Type.ARRAY);
}
@Override
public boolean equals(final Object value) {
if (value == this) {
return true;
} else if (value instanceof BasicValue) {
if (type == null) {
return ((BasicValue) value).type == null;
} else {
return type.equals(((BasicValue) value).type);
}
} else {
return false;
}
}
@Override
public int hashCode() {
return type == null ? 0 : type.hashCode();
}
@Override
public String toString() {
if (this == UNINITIALIZED_VALUE) {
return ".";
} else if (this == RETURNADDRESS_VALUE) {
return "A";
} else if (this == REFERENCE_VALUE) {
return "R";
} else {
return type.getDescriptor();
}
}
}
