XCOMM!/bin/sh

XCOMM $XConsortium: elistgen.usl /main/2 1996/12/04 10:13:26 swick $

XCOMM

XCOMM #########################################################################

XCOMM Construct shared-library export lists for Novell based on standardized

XCOMM export list description file

XCOMM

XCOMM Usage: exportlistgen libFoo.so libFoo.elist > libFoo.lopt

XCOMM

XCOMM	libFoo.so    => shared library of interest

XCOMM	libFoo.elist => Meta description of necessary export list.

XCOMM

XCOMM    The output file, "libFoo.lopt" may then be passed to the linker to 

XCOMM    reconstruct the shared library.

XCOMM

XCOMM (c) Copyright 1996 Digital Equipment Corporation.

XCOMM (c) Copyright 1996 Hewlett-Packard Company.

XCOMM (c) Copyright 1996 International Business Machines Corp.

XCOMM (c) Copyright 1996 Sun Microsystems, Inc.

XCOMM (c) Copyright 1996 Novell, Inc. 

XCOMM (c) Copyright 1996 FUJITSU LIMITED.

XCOMM (c) Copyright 1996 Hitachi.

XCOMM

XCOMM #########################################################################

XCOMM Utility programs

FILTER=CXXFILT			# C++ symbol demangler

AWK=awk				# awk

XCOMM For nm, cat, pr, expand, awk, c++filt

PATH=/usr/bin:/bin:/usr/ucb:/usr/ccs/bin

XCOMM Temporary files

EXPORTLIST=/tmp/elistgen1.$$	# list of export symbols from "libfoo.elist"

NMLIST=/tmp/elistgen2.$$	# name list from libfoo.sl

FILTLIST=/tmp/elistgen3.$$	# demangled (C++) version of NMLIST

XCOMM Print useful information at the top of the output

echo "#" `date`

echo "# This linker options list was produced by" $0

echo "# Input export list description taken from:" $2

echo "# Target library:" $1

echo "# Target Operating System:" `uname -msrv`

echo "# "

XCOMM Extract the globally visible symbols from target library.

XCOMM The NMLIST generated here is later used to cross-check the symbols in the

XCOMM supplied export-list.

nm -p $1 | $AWK '

    / [TD] [^\$]/{print $3}   # Text, Data, BSS, or Secondary symbols

' > $NMLIST

XCOMM Demangle the global library symbols. This operation is necessary to convert

XCOMM mangled C++ symbols into their C++ notation.

${FILTER:-cat} $NMLIST > $FILTLIST

XCOMM Clean up the export-list description file.

XCOMM Note that C++ symbols may have embedded spaces in them.

cat $2 | $AWK '

    BEGIN           {

	csyms     = 0;		# C   language symbols in libfoo.list

	cplusplus = 0;		# C++ language symbols in libfoo.list

	isyms     = 0;		# C   internal symbols in libfoo.elist

	iplusplus = 0;		# C++ internal symbols in libfoo.elist

	implicit  = "";		# Handling of implicit symbols

    }

    $1 == "default" {

	# A default clause suppresses warnings about implicit symbols.

	if ($2 != "" && $2 != "force" && $2 != "public" && 

	    $2 != "private" && $2 != "internal") {

	    print "# Warning: illegal default clause:", $2 | "cat 1>&2;;

	    next;

	}

	if (implicit != "")

	    print "# Warning: multiple default clauses." | "cat 1>&2;;

        implicit = $2;

	next;

    }

    $1 == "force" || $1 == "public" || $1 == "private" {

	csyms ++;

	print $1 ";;" $2;

	next;

    }

    $1 == "publicC++" || $1 == "privateC++" {

	cplusplus ++;

	string = $2;

	for (n = 3; n <= NF; n++) {

	    string = string " " $n;

	}

	print $1 ";;" string;

	next;

    }

    $1 == "internal" {

	isyms ++;

	print $1 ";;" $2;

	next;

    }

    $1 == "internalC++" {

	iplusplus ++;

	string = $2;

	for (n = 3; n <= NF; n++) {

	    string = string " " $n;

	}

	print $1 ";;" string;

	next;

    }

    $1 == "#line" || $1 == "#" {

	# cpp will have removed comments, but may have added other stuff.

	next;

    }

    NF > 0 {

	print "# Warning: unrecognized directive:", $0 | "cat 1>&2;;

	next;

    }

    END  {

	printf("# Exporting %d C and %d C++ symbols, hiding %d and %d.\n",

			    csyms, cplusplus, isyms, iplusplus) | "cat 1>&2;;

	if (implicit != "") {

	    print "# Unspecified symbols are " implicit "." | "cat 1>&2;;

	    print "default;;" implicit;

	}

    }

' > $EXPORTLIST

XCOMM Read in the above files and write result to stdout.  The contents

XCOMM of NMLIST and FILTLIST are used to construct a symbol lookup table.

XCOMM The contents of EXPORTLIST are converted with the help of this table.

XCOMM Use ";" as a delimiter in the symbol lookup table.

(pr -m -s";" -t -w1024 $NMLIST $FILTLIST | expand -1; cat $EXPORTLIST) | $AWK '

    BEGIN {

	FS = ";";

	implicit = 0;

    }

    NF == 2 {

	# This is "pr" output, i.e., symbol translation table

	syms[$2] = $1;

	next;

    }

    NF == 3 && $1 == "default" {

	# Treatment of unspecified symbols.

	if ($3 == "internal")

	    implicit = 1;

	else if ($3 == "private" || $3 == "privateC++")

	    implicit = 2;

	else if ($3 == "public" || $3 == "publicC++")

	    implicit = 3;

	else # $3 == "force"

	    implicit = 4;

        next;

    }

    NF == 3 {

	# Parse our instructions for this symbol.

	if ($1 == "internal" || $1 == "internalC++")

	    export = 1;

	else if ($1 == "private" || $1 == "privateC++")

	    export = 2;

	else if ($1 == "public" || $1 == "publicC++")

	    export = 3;

	else # $1 == "force"

	    export = 4;

	# Process it.

	if (length(syms[$3]) > 0) {

	    # This symbol is present in the library.

	    if (donelist[$3])

		print "# Warning: Duplicate entry for", $3, 

		    "in export list" | "cat 1>&2;;

	    if (donelist[$3] < export) {

		if (export > 1)

		    print syms[$3];

		donelist[$3] = export;

	    }

	} else { 

	    # Do not complain about unknown forced-export symbols.

	    if (export == 4) {

		print $3;

		donelist[$3] = export;

	    } else

		print "# Warning:", $3,

		    "was not in the nm list for this library" | "cat 1>&2;;

	}

	next;

    }

    END { 

	# Ignore built-in linker symbols.

	if (implicit == 0) {

	    if (!donelist["_DYNAMIC"])

		donelist["_DYNAMIC"] = 1;

	    if (!donelist["_GLOBAL_OFFSET_TABLE_"])

		donelist["_GLOBAL_OFFSET_TABLE_"] = 1;

	    if (!donelist["_edata"])

		donelist["_edata"] = 1;

	    if (!donelist["_end"])

		donelist["_end"] = 1;

	    if (!donelist["_etext"])

		donelist["_etext"] = 1;

	}

	# Process implicit symbols.

	for (i in syms) {

	    if (!donelist[i] && (length(syms[i]) > 0)) {

		# Ignore C++ compiler symbols

		if (implicit == 0 &&

		    (syms[i] !~ /^__vtbl__[0-9]*_/) &&

		    (syms[i] !~ /^__cpp_unixware_[0-9]*$/))

		    print "# Warning:", syms[i],

		          "was not in the export list" | "cat 1>&2;;

	        if (implicit > 1)

		    print syms[i];

	    }

	}

    }

'

XCOMM Clean up temporary files

rm $EXPORTLIST

rm $NMLIST

rm $FILTLIST