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/*
 * This file is available under and governed by the GNU General Public
 * License version 2 only, as published by the Free Software Foundation.
 * However, the following notice accompanied the original version of this
 * file:
 *
 * 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
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */
package jdk.internal.org.objectweb.asm.tree.analysis;

import jdk.internal.org.objectweb.asm.Type;

A 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
/** * 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.
/** An uninitialized value. */
public static final BasicValue UNINITIALIZED_VALUE = new BasicValue(null);
A byte, boolean, char, short, or int value.
/** A byte, boolean, char, short, or int value. */
public static final BasicValue INT_VALUE = new BasicValue(Type.INT_TYPE);
A float value.
/** A float value. */
public static final BasicValue FLOAT_VALUE = new BasicValue(Type.FLOAT_TYPE);
A long value.
/** A long value. */
public static final BasicValue LONG_VALUE = new BasicValue(Type.LONG_TYPE);
A double value.
/** A double value. */
public static final BasicValue DOUBLE_VALUE = new BasicValue(Type.DOUBLE_TYPE);
An object or array reference value.
/** 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).
/** A return address value (produced by a jsr instruction). */
public static final BasicValue RETURNADDRESS_VALUE = new BasicValue(Type.VOID_TYPE);
The Type of this value, or null for uninitialized values.
/** The {@link Type} of this value, or {@literal null} for uninitialized values. */
private final Type type;
Constructs a new BasicValue of the given type.
Params:
  • type – the value 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 Type of this value.
Returns:the Type of this value.
/** * Returns the {@link Type} of this value. * * @return the {@link Type} of this value. */
public Type getType() { return type; } @Override 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.
Returns:whether this value corresponds to an object or array reference.
/** * 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(); } } }