73 lines
2.1 KiB
Java
73 lines
2.1 KiB
Java
/*******************************************************************************
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* Copyright (c) 2002 - 2006 IBM Corporation.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package com.ibm.wala.classLoader;
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/**
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* Simple object that represents a program counter value (i.e., an instruction in the bytecode)
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*/
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public class ProgramCounter {
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/**
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* A constant indicating no source line number information is available.
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*/
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public static final int NO_SOURCE_LINE_NUMBER = -1;
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/**
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* Index into bytecode describing this instruction
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*/
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private final int programCounter;
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/**
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* @param programCounter Index into bytecode describing this instruction
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*/
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public ProgramCounter(final int programCounter) {
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if (programCounter < 0) {
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throw new IllegalArgumentException("illegal programCounter: " + programCounter);
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}
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this.programCounter = programCounter;
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}
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/**
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* Return the program counter (index into the method's bytecode) for this call site.
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*
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* @return the program counter (index into the method's bytecode) for this call site.
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*
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*/
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public int getProgramCounter() {
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return programCounter;
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}
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/**
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* A Program Counter value is enough to uniquely identify a call site reference within a method.
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*
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* Note: must use these objects with extreme care; this only works if you never mix ProgramLocations from different methods in the
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* same collection.
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*
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* @see java.lang.Object#equals(Object)
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*/
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@Override
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public boolean equals(Object obj) {
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return (obj instanceof ProgramCounter) && ((ProgramCounter) obj).programCounter == programCounter;
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}
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@Override
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public int hashCode() {
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return programCounter + 77;
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}
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@Override
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public String toString() {
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return "PC@" + programCounter;
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}
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}
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