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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 java.util.Set;
import org.objectweb.asm.tree.AbstractInsnNode;
/**
* A {@link Value} which keeps track of the bytecode instructions that can produce it.
*
* @author Eric Bruneton
*/
public class SourceValue implements Value {
/**
* The size of this value, in 32 bits words. This size is 1 for byte, boolean, char, short, int,
* float, object and array types, and 2 for long and double.
*/
public final int size;
/**
* The instructions that can produce this value. For example, for the Java code below, the
* instructions that can produce the value of {@code i} at line 5 are the two ISTORE instructions
* at line 1 and 3:
*
*
* 1: i = 0;
* 2: if (...) {
* 3: i = 1;
* 4: }
* 5: return i;
*
*/
public final Set insns;
/**
* Constructs a new {@link SourceValue}.
*
* @param size the size of this value, in 32 bits words. This size is 1 for byte, boolean, char,
* short, int, float, object and array types, and 2 for long and double.
*/
public SourceValue(final int size) {
this(size, new SmallSet<>());
}
/**
* Constructs a new {@link SourceValue}.
*
* @param size the size of this value, in 32 bits words. This size is 1 for byte, boolean, char,
* short, int, float, object and array types, and 2 for long and double.
* @param insnNode an instruction that can produce this value.
*/
public SourceValue(final int size, final AbstractInsnNode insnNode) {
this.size = size;
this.insns = new SmallSet<>(insnNode);
}
/**
* Constructs a new {@link SourceValue}.
*
* @param size the size of this value, in 32 bits words. This size is 1 for byte, boolean, char,
* short, int, float, object and array types, and 2 for long and double.
* @param insnSet the instructions that can produce this value.
*/
public SourceValue(final int size, final Set insnSet) {
this.size = size;
this.insns = insnSet;
}
/**
* Returns the size of this value.
*
* @return the size of this value, in 32 bits words. This size is 1 for byte, boolean, char,
* short, int, float, object and array types, and 2 for long and double.
*/
@Override
public int getSize() {
return size;
}
@Override
public boolean equals(final Object value) {
if (!(value instanceof SourceValue)) {
return false;
}
SourceValue sourceValue = (SourceValue) value;
return size == sourceValue.size && insns.equals(sourceValue.insns);
}
@Override
public int hashCode() {
return insns.hashCode();
}
}
