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 /*
  * fb-contrib - Auxiliary detectors for Java programs
  * Copyright (C) 2005-2014 Dave Brosius
  * 
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
  * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */
package com.mebigfatguy.fbcontrib.utils;
import  org.apache.bcel.classfile.Code;
import  org.apache.bcel.classfile.LineNumber;
import  org.apache.bcel.classfile.LineNumberTable;

a collection of static methods for working with code attribute queries
public class AttributesUtils 
	private AttributesUtils() {
	}

returns whether the pc is at a line number that also appears for a another byte code offset later on in the method. If this occurs we are in a jdk6 finally replicated block, and so don't report this. If the code has no line number table, then just report it.

Parameters:
obj the code object to find line number attributes from
pc the pc to check
Returns:
whether the pc is in user code
	public static boolean isValidLineNumber(Code objint pc)
	{
		LineNumberTable lnt = obj.getLineNumberTable();
		if (lnt == null)
			return true;
		LineNumber[] lineNumbers = lnt.getLineNumberTable();
		if (lineNumbers == null)
			return true;
		int lo = 0; 
		int hi = lineNumbers.length - 1;
		int mid = 0;
		int linePC = 0;
		while (lo <= hi) {
			mid = (lo + hi) / 2;
			linePC = lineNumbers[mid].getStartPC();
			if (linePC == pc)
				break;
			if (linePC < pc)
				lo = mid + 1;
			else
				hi = mid - 1;
		}
		int lineNo = lineNumbers[mid].getLineNumber();
		for (int i = 0; i < lineNumbers.length; i++) {
			if ((mid != i) && (lineNumbers[i].getLineNumber() == lineNo))
				return false;
		}
		return true;
	}
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