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jeremybenn |
/***
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* ASM: a very small and fast Java bytecode manipulation framework
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* Copyright (c) 2000-2005 INRIA, France Telecom
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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package org.objectweb.asm.tree.analysis;
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import org.objectweb.asm.Type;
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/**
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* A {@link Value} that is represented by its type in a seven types type sytem.
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* This type system distinguishes the UNINITIALZED, INT, FLOAT, LONG, DOUBLE,
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* REFERENCE and RETURNADDRESS types.
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*
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* @author Eric Bruneton
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*/
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public class BasicValue implements Value {
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public final static Value UNINITIALIZED_VALUE = new BasicValue(null);
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public final static Value INT_VALUE = new BasicValue(Type.INT_TYPE);
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public final static Value FLOAT_VALUE = new BasicValue(Type.FLOAT_TYPE);
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public final static Value LONG_VALUE = new BasicValue(Type.LONG_TYPE);
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public final static Value DOUBLE_VALUE = new BasicValue(Type.DOUBLE_TYPE);
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public final static Value REFERENCE_VALUE = new BasicValue(Type.getType("Ljava/lang/Object;"));
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public final static Value RETURNADDRESS_VALUE = new BasicValue(null);
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private Type type;
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public BasicValue(final Type type) {
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this.type = type;
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}
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public Type getType() {
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return type;
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}
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public int getSize() {
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return type == Type.LONG_TYPE || type == Type.DOUBLE_TYPE ? 2 : 1;
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}
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public boolean isReference() {
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return type != null
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&& (type.getSort() == Type.OBJECT || type.getSort() == Type.ARRAY);
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}
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public boolean equals(final Object value) {
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if (value == this) {
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return true;
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} else if (value instanceof BasicValue) {
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if (type == null) {
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return ((BasicValue) value).type == null;
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} else {
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return type.equals(((BasicValue) value).type);
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}
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} else {
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return false;
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}
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}
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public int hashCode() {
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return type == null ? 0 : type.hashCode();
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}
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public String toString() {
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if (this == UNINITIALIZED_VALUE) {
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return ".";
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} else if (this == RETURNADDRESS_VALUE) {
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return "A";
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} else if (this == REFERENCE_VALUE) {
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return "R";
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} else {
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return type.getDescriptor();
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}
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}
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}
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