oracle.toplink.libraries.asm.tree.analysis.DataflowValue 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 java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import oracle.toplink.libraries.asm.tree.AbstractInsnNode;
/**
* A {@link Value} that is represented by its type in a two types type system.
* This type system distinguishes the ONEWORD and TWOWORDS types.
*
* @author Eric Bruneton
*/
public class DataflowValue implements Value {
/**
* The size of this value.
*/
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 i
* at line 5 are the txo ISTORE instructions at line 1 and 3:
*
* 1: i = 0;
* 2: if (...) {
* 3: i = 1;
* 4: }
* 5: return i;
*
* This field is a set of {@link AbstractInsnNode} objects.
*/
public final Set insns;
public DataflowValue (final int size) {
this(size, Collections.EMPTY_SET);
}
public DataflowValue (final int size, final AbstractInsnNode insn) {
this.size = size;
this.insns = new HashSet();
this.insns.add(insn);
}
public DataflowValue (final int size, final Set insns) {
this.size = size;
this.insns = insns;
}
public int getSize () {
return size;
}
public boolean equals (final Value value) {
DataflowValue v = (DataflowValue)value;
return size == v.size && insns.equals(v.insns);
}
}