private static String parseBitcode(String file) {
		StringBuffer output = new StringBuffer();

		try {
			Process p = Runtime.getRuntime().exec("opt -print-callgraph " + file);
			p.waitFor();
			BufferedReader reader = new BufferedReader(new InputStreamReader(p.getErrorStream()));
                        String line = "";

			// Go through the bitcode file line by line
			String callerFunction = "";
			String[] foundFuncts;
			int count = 0;
			Map<String, Integer> Uses = new HashMap<String, Integer>();
			Map<String, HashMap<String,Integer>> functionsWithin = new HashMap<String, HashMap<String,Integer>>();
			Map<String, Integer> tempFunctionsWithin = new HashMap<String, Integer>();
			while ((line = reader.readLine())!= null) {
				if (line.contains("Call")) {
					// Check the caller function name
					if (line.contains("null function")) {
						callerFunction = "null";
					} else {
						callerFunction = line.split("'")[1];
					}
					if (foundFuncts[count] != callerFunction){ //if first time seeing new function
						count++;
						tempFunctionsWithin = new HashMap<String, Integer>(); // clear the tempFunctionsWithin
						foundFuncts[count] = callerFunction; // add to array
						functionsWithin.put(callerFunction,tempFunctionsWithin);
					} else {

					}

				} else if (line.contains("'")) {
					// Check the callee function name
					String calleeFunction = line.split("'")[1];
					// Add the caller/callee pair to the hashtable
					tempFunctionsWithin.put(calleeFunction,1);
					output.append(callerFunction + ":" + calleeFunction + "\n");
				}

			}

		} catch (Exception e) {
			e.printStackTrace();
		}
		System.out.println("derpp   "+functionsWithin.entrySet());
		return output.toString();
	}