oracle.toplink.libraries.asm.tree.analysis.BasicValue Maven / Gradle / Ivy
/***
* ASM: a very small and fast Java bytecode manipulation framework
* Copyright (c) 2000,2002,2003 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 oracle.toplink.libraries.asm.tree.analysis;
import oracle.toplink.libraries.asm.Type;
/**
* A {@link Value} that is represented by its type in a seven types type sytem.
* This type system distinguishes the UNINITIALZED, INT, FLOAT, LONG, DOUBLE,
* REFERENCE and RETURNADDRESS types.
*
* @author Eric Bruneton
*/
public class BasicValue implements Value {
public final static Value UNINITIALIZED_VALUE = new BasicValue(null);
public final static Value INT_VALUE = new BasicValue(Type.INT_TYPE);
public final static Value FLOAT_VALUE = new BasicValue(Type.FLOAT_TYPE);
public final static Value LONG_VALUE = new BasicValue(Type.LONG_TYPE);
public final static Value DOUBLE_VALUE = new BasicValue(Type.DOUBLE_TYPE);
public final static Value REFERENCE_VALUE = new BasicValue(Type.getType("Ljava/lang/Object;"));
public final static Value RETURNADDRESS_VALUE = new BasicValue(null);
private Type type;
public BasicValue (final Type type) {
this.type = type;
}
public Type getType () {
return type;
}
public int getSize () {
return type == Type.LONG_TYPE || type == Type.DOUBLE_TYPE ? 2 : 1;
}
public boolean isReference () {
return type != null && (type.getSort() == Type.OBJECT || type.getSort() == Type.ARRAY);
}
public boolean equals (final Value 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;
}
}
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();
}
}
}