#!/bin/bash+
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#+
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# Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved.+
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# DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.+
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#+
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# This code is free software; you can redistribute it and/or modify it+
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# under the terms of the GNU General Public License version 2 only, as+
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# published by the Free Software Foundation.+
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#+
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# This code is distributed in the hope that it will be useful, but WITHOUT+
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# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or+
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# FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License+
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# version 2 for more details (a copy is included in the LICENSE file that+
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# accompanied this code).+
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#+
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# You should have received a copy of the GNU General Public License version+
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# 2 along with this work; if not, write to the Free Software Foundation,+
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# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.+
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#+
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# Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA+
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# or visit www.oracle.com if you need additional information or have any+
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# questions.+
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#+
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+
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# Simple tool to diff two shared libraries. +
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# Criterias: two shared libraries are considered equal if:+
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# the file sizes are the same AND the symbols outputs from the nm command are equal+
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+
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if [ $# -lt 2 ] +
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then+
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  echo "Diff two shared libs. Return codes:"+
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  echo "0 - no diff"+
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  echo "1 - Identical symbols AND size, BUT not bytewise identical"+
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  echo "2 - Identical symbols BUT NEW size"+
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  echo "3 - Differences, content BUT SAME size"+
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  echo "4 - Differences, content AND size"+
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  echo "10 - Could not perform diff"+
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  echo "Use 'quiet' to disable any output."+
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  echo "Syntax: $0 file1 file2 [quiet]"+
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  exit 10+
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fi+
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+
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if [ ! -f $1 ]+
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then+
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  echo $1 does not exist+
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  exit 10+
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fi+
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+
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if [ ! -f $2 ]+
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then+
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  echo $2 does not exist+
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  exit 10+
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fi+
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+
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if [ "`uname`" == "SunOS" ]; then+
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    if [ -f "`which gnm`" ]; then+
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        NM=gnm+
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# Jonas 2012-05-29: solaris native nm produces radically different output than gnm+
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#                   so if using that...we need different filter than "cut -f 2-"+
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#+
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    elif [ -f "`which nm`" ]; then+
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        NM=nm+
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    else+
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        echo "No nm command found"+
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        exit 10+
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    fi+
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    LDD=ldd+
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elif [ $OSTYPE == "cygwin" ]; then+
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    NM="$VS100COMNTOOLS/../../VC/bin/amd64/dumpbin.exe"+
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    NM_ARGS=/exports+
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    LDD=+
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elif [ "`uname`" == "Darwin" ]; then+
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    NM=nm+
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    LDD="otool -L"+
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else+
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    NM=nm+
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    LDD=ldd+
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fi+
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+
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# Should the differences be viewed?+
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VIEW=+
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# You can do export DIFF=meld to view+
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# any differences using meld instead.+
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if [ -n "$DIFF" ]; then+
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    DIFF="$DIFF"+
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else+
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    DIFF=diff+
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fi+
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OLD=$(cd $(dirname $1) && pwd)/$(basename $1)+
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NEW=$(cd $(dirname $2) && pwd)/$(basename $2)+
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+
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OLD_SIZE=$(ls -l "$OLD" | awk '{ print $5 }')+
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NEW_SIZE=$(ls -l "$NEW" | awk '{ print $5 }')+
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+
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if [ $# -gt 3 ]+
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then+
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    ROOT1=$(cd $3 && pwd)+
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    ROOT2=$(cd $4 && pwd)+
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    OLD_NAME=$(echo $OLD | sed "s|$ROOT1/||")+
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    NEW_NAME=$(echo $NEW | sed "s|$ROOT2/||")+
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    if [ "x$5" == "xview" ]; then VIEW=view; fi+
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else+
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    ROOT1=$(dirname $OLD)/+
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    ROOT2=$(dirname $NEW)/+
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    OLD_NAME=$OLD+
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    NEW_NAME=$NEW+
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    if [ "x$3" == "xview" ]; then VIEW=view; fi+
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fi+
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+
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OLD_SUFFIX="${OLD##*.}"+
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NEW_SUFFIX="${NEW##*.}"+
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if [ "$OLD_SUFFIX" != "$NEW_SUFFIX" ]; then+
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    echo The files do not have the same suffix type!+
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    exit 10+
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fi+
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+
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if [ "$OLD_SUFFIX" != "so" ] && [ "$OLD_SUFFIX" != "dylib" ] && [ "$OLD_SUFFIX" != "dll" ]; then+
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    echo The files have to be .so, .dylib or .dll! They are $OLD_SUFFIX+
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    exit 10+
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fi+
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+
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TYPE="$OLD_SUFFIX"+
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+
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if cmp $OLD $NEW > /dev/null+
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then+
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    # The files were bytewise identical.+
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    echo Identical: $OLD_NAME+
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    exit 0+
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fi+
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+
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OLD_SYMBOLS=$COMPARE_ROOT/nm.$OLD_NAME.old+
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NEW_SYMBOLS=$COMPARE_ROOT/nm.$NEW_NAME.new+
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+
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mkdir -p $(dirname $OLD_SYMBOLS)+
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mkdir -p $(dirname $NEW_SYMBOLS)+
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+
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if [ $OSTYPE == "cygwin" ]; then+
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    "$NM" $NM_ARGS $OLD | grep " = " > $OLD_SYMBOLS+
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    "$NM" $NM_ARGS $NEW | grep " = " > $NEW_SYMBOLS+
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    "$NM" $NM_ARGS $OLD > $OLD_SYMBOLS.full+
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    "$NM" $NM_ARGS $NEW > $NEW_SYMBOLS.full+
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else+
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    # Strip the addresses, just compare the ordering of the symbols.+
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    $NM $OLD | cut -f 2- -d ' ' > $OLD_SYMBOLS+
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    $NM $NEW | cut -f 2- -d ' ' > $NEW_SYMBOLS+
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    # But store the full information for easy diff access.+
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    $NM $OLD  > $OLD_SYMBOLS.full+
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    $NM $NEW  > $NEW_SYMBOLS.full+
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fi+
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+
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DIFFS=$(LANG=C diff $OLD_SYMBOLS $NEW_SYMBOLS)+
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+
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RESULT=0+
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+
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if [ "${LDD}" ]+
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then+
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    NAME=`basename $OLD`+
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    TMP=$COMPARE_ROOT/ldd/ldd.${NAME}+
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    rm -rf "${TMP}"+
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    mkdir -p "${TMP}"+
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    +
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    (cd "${TMP}" && cp $OLD . && ${LDD} ${NAME} | awk '{ print $1;}' | sort | tee dep.old | uniq > dep.uniq.old)+
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    (cd "${TMP}" && cp $NEW . && ${LDD} ${NAME} | awk '{ print $1;}' | sort | tee dep.new | uniq > dep.uniq.new)+
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    (cd "${TMP}" && rm -f ${NAME})+
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    +
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    DIFFS_DEP=$(LANG=C diff "${TMP}/dep.old" "${TMP}/dep.new")+
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    DIFFS_UNIQ_DEP=$(LANG=C diff "${TMP}/dep.uniq.old" "${TMP}/dep.uniq.new")+
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    +
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    DEP_MSG=+
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    if [ -z "${DIFFS_UNIQ_DEP}" -a -z "${DIFFS_DEP}" ]; then+
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       DEP_MSG="Identical dependencies"+
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    elif [ -z "${DIFFS_UNIQ_DEP}" ]; then+
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       DEP_MSG="Redundant duplicate dependencies added"+
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       RES=1+
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    else+
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       DEP_MSG="DIFFERENT dependencies"+
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       RES=1+
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    fi+
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fi+
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+
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if [ -n "$DIFFS" ]; then+
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   if [ $OLD_SIZE -ne $NEW_SIZE ]+
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   then+
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       echo Differences, content AND size     : $DEP_MSG : $OLD_NAME +
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       RESULT=4+
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   else+
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       echo Differences, content BUT SAME size: $DEP_MSG : $OLD_NAME +
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       RESULT=3+
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   fi+
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   if [ "x$VIEW" == "xview" ]; then+
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       LANG=C $DIFF $OLD_SYMBOLS $NEW_SYMBOLS+
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   fi+
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else+
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   if [ $OLD_SIZE -ne $NEW_SIZE ]+
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   then+
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       echo Identical symbols BUT NEW size    : $DEP_MSG : $OLD_NAME +
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       RESULT=2+
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   else+
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       echo Identical symbols AND size, BUT not bytewise identical: $DEP_MSG : $OLD_NAME +
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       RESULT=1+
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   fi+
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fi+
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+
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exit $RESULT+
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