#!/bin/bash

# Copyright (c) 2009 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

# Verifies that no global text symbols are present in a Mach-O file
# (MACH_O_FILE) at an address higher than the address of a specific symbol
# (LAST_SYMBOL).  If LAST_SYMBOL is not found in MACH_O_FILE or if symbols
# are present with addresses higher than LAST_SYMBOL's address, an error
# message is printed to stderr, and the script will exit nonzero.
#
# This script can be used to verify that all of the global text symbols in
# a Mach-O file are accounted for in an order file.

if [ ${#} -ne 2 ] ; then
  echo "usage: ${0} LAST_SYMBOL MACH_O_FILE" >& 2
  exit 1
fi

LAST_SYMBOL=${1}
MACH_O_FILE=${2}

SYMBOLS=$(nm -fgjn -s __TEXT __text "${MACH_O_FILE}")
if [ ${?} -ne 0 ] || [ -z "${SYMBOLS}" ] ; then
  echo "${0}: no symbols in ${MACH_O_FILE}" >& 2
  exit 1
fi

LAST_SYMBOLS=$(grep -A 100 -Fx "${LAST_SYMBOL}" <<< "${SYMBOLS}")
if [ ${?} -ne 0 ] || [ -z "${LAST_SYMBOLS}" ] ; then
  echo "${0}: symbol ${LAST_SYMBOL} not found in ${MACH_O_FILE}" >& 2
  exit 1
fi

UNORDERED_SYMBOLS=$(grep -Fvx "${LAST_SYMBOL}" <<< "${LAST_SYMBOLS}")
if [ ${?} -eq 0 ] || [ -n "${UNORDERED_SYMBOLS}" ] ; then
  echo "${0}: unordered symbols in ${MACH_O_FILE}:" >& 2
  echo "${UNORDERED_SYMBOLS}" >& 2
  exit 1
fi

exit 0