path: root/makedef.pl

#./perl -w
#
# Create the export list for perl.
#
# Needed by WIN32 and OS/2 for creating perl.dll,
# and by AIX for creating libperl.a when -Dusershrplib is in effect,
#
# Reads from information stored in
#
#    config.h
#    config.sh
#    global.sym
#    globvar.sym
#    intrpvar.h
#    miniperl.map (on OS/2)
#    perl5.def    (on OS/2; this is the old version of the file being made)
#    perlio.sym
#    perlvars.h
#
# plus long lists of function names hard-coded directly in this script and
# in the DATA section.
#
# Writes the result to STDOUT.
#
# Normally this script is invoked from a makefile (e.g. win32/Makefile),
# which redirects STDOUT to a suitable file, such as:
#
#    perl5.def   OS/2
#    perldll.def Windows
#    perl.exp    AIX
#    perl.imp    NetWare


BEGIN { unshift @INC, "lib" }
use Config;
use strict;

use vars qw($PLATFORM $CCTYPE $FILETYPE $CONFIG_ARGS $ARCHNAME $PATCHLEVEL);

my (%define, %ordinal);

while (@ARGV) {
    my $flag = shift;
    if ($flag =~ s/^CC_FLAGS=/ /) {
	for my $fflag ($flag =~ /(?:^|\s)-D(\S+)/g) {
	    $fflag     .= '=1' unless $fflag =~ /^(\w+)=/;
	    $define{$1} = $2   if $fflag =~ /^(\w+)=(.+)$/;
	}
	next;
    }
    $define{$1} = 1 if ($flag =~ /^-D(\w+)$/);
    $define{$1} = $2 if ($flag =~ /^-D(\w+)=(.+)$/);
    $CCTYPE   = $1 if ($flag =~ /^CCTYPE=(\w+)$/);
    $PLATFORM = $1 if ($flag =~ /^PLATFORM=(\w+)$/);
    if ($PLATFORM eq 'netware') {
	$FILETYPE = $1 if ($flag =~ /^FILETYPE=(\w+)$/);
    }
}

my @PLATFORM = qw(aix win32 wince os2 netware);
my %PLATFORM;
@PLATFORM{@PLATFORM} = ();

defined $PLATFORM || die "PLATFORM undefined, must be one of: @PLATFORM\n";
exists $PLATFORM{$PLATFORM} || die "PLATFORM must be one of: @PLATFORM\n";

if ($PLATFORM eq 'win32' or $PLATFORM eq 'wince' or $PLATFORM eq "aix") {
	# Add the compile-time options that miniperl was built with to %define.
	# On Win32 these are not the same options as perl itself will be built
	# with since miniperl is built with a canned config (one of the win32/
	# config_H.*) and none of the BUILDOPT's that are set in the makefiles,
	# but they do include some #define's that are hard-coded in various
	# source files and header files and don't include any BUILDOPT's that
	# the user might have chosen to disable because the canned configs are
	# minimal configs that don't include any of those options.
	my $opts = ($PLATFORM eq 'wince' ? '-MCross' : ''); # for wince need Cross.pm to get Config.pm

	$ENV{PERL5LIB} = join $Config{path_sep}, @INC;
	my $cmd = "$^X $opts -V";
	my $config = `$cmd`
	    or die "Couldn't run [$cmd]: $!";
	my($options) = $config =~ /^  Compile-time options: (.*?)\n^  \S/ms;
	$options =~ s/\s+/ /g;
	print STDERR "Options: ($options)\n";
	foreach (split /\s+/, $options) {
		$define{$_} = 1;
	}
}

my %exportperlmalloc =
    (
       Perl_malloc		=>	"malloc",
       Perl_mfree		=>	"free",
       Perl_realloc		=>	"realloc",
       Perl_calloc		=>	"calloc",
    );

my $exportperlmalloc = $PLATFORM eq 'os2';

my $config_sh   = "config.sh";
my $config_h    = "config.h";
my $intrpvar_h  = "intrpvar.h";
my $perlvars_h  = "perlvars.h";
my $global_sym  = "global.sym";
my $globvar_sym = "globvar.sym";
my $perlio_sym  = "perlio.sym";
my $static_ext = "";

if ($PLATFORM eq 'aix') {
    # Nothing for now.
}
elsif ($PLATFORM =~ /^win(?:32|ce)$/ || $PLATFORM eq 'netware') {
    $CCTYPE = "MSVC" unless defined $CCTYPE;
    foreach ($intrpvar_h, $perlvars_h, $global_sym, $globvar_sym, $perlio_sym) {
	s!^!..\\!;
    }
}

unless ($PLATFORM eq 'win32' || $PLATFORM eq 'wince' || $PLATFORM eq 'netware') {
    open(CFG,$config_sh) || die "Cannot open $config_sh: $!\n";
    while (<CFG>) {
	if (/^(?:ccflags|optimize)='(.+)'$/) {
	    $_ = $1;
	    $define{$1} = 1 while /-D(\w+)/g;
	}
        if (/^(d_(?:mmap|sigaction))='(.+)'$/) {
            $define{$1} = $2;
        }
	if ($PLATFORM eq 'os2') {
	    $CONFIG_ARGS = $1 if /^config_args='(.+)'$/;
	    $ARCHNAME =    $1 if /^archname='(.+)'$/;
	    $PATCHLEVEL =  $1 if /^perl_patchlevel='(.+)'$/;
	}
    }
    close(CFG);
}
if ($PLATFORM eq 'win32' || $PLATFORM eq 'wince') {
    open(CFG,"<..\\$config_sh") || die "Cannot open ..\\$config_sh: $!\n";
    if ((join '', <CFG>) =~ /^static_ext='(.*)'$/m) {
        $static_ext = $1;
    }
    close(CFG);
}

open(CFG,$config_h) || die "Cannot open $config_h: $!\n";
while (<CFG>) {
    $define{$1} = 1 if /^\s*#\s*define\s+(MYMALLOC)\b/;
    $define{$1} = 1 if /^\s*#\s*define\s+(MULTIPLICITY)\b/;
    $define{$1} = 1 if /^\s*#\s*define\s+(PERL_\w+)\b/;
    $define{$1} = 1 if /^\s*#\s*define\s+(USE_\w+)\b/;
    $define{$1} = 1 if /^\s*#\s*define\s+(HAS_\w+)\b/;
}
close(CFG);

# perl.h logic duplication begins

if ($define{PERL_IMPLICIT_SYS}) {
    $define{PL_OP_SLAB_ALLOC} = 1;
}

if ($define{USE_ITHREADS}) {
    if (!$define{MULTIPLICITY}) {
        $define{MULTIPLICITY} = 1;
    }
}

$define{PERL_IMPLICIT_CONTEXT} ||=
    $define{USE_ITHREADS} ||
    $define{MULTIPLICITY} ;

if ($define{USE_ITHREADS} && $PLATFORM ne 'win32' && $^O ne 'darwin') {
    $define{USE_REENTRANT_API} = 1;
}

# perl.h logic duplication ends

my $sym_ord = 0;

print STDERR "Defines: (" . join(' ', sort keys %define) . ")\n";

if ($PLATFORM =~ /^win(?:32|ce)$/) {
    (my $dll = ($define{PERL_DLL} || "perl514")) =~ s/\.dll$//i;
    print "LIBRARY $dll\n";
    # The DESCRIPTION module definition file statement is not supported
    # by VC7 onwards.
    if ($CCTYPE =~ /^(?:MSVC60|GCC|BORLAND)$/) {
	print "DESCRIPTION 'Perl interpreter'\n";
    }
    print "EXPORTS\n";
    if ($define{PERL_IMPLICIT_SYS}) {
	output_symbol("perl_get_host_info");
	output_symbol("perl_alloc_override");
    }
    if ($define{USE_ITHREADS} and $define{PERL_IMPLICIT_SYS}) {
	output_symbol("perl_clone_host");
    }
}
elsif ($PLATFORM eq 'os2') {
    if (open my $fh, '<', 'perl5.def') {
      while (<$fh>) {
	last if /^\s*EXPORTS\b/;
      }
      while (<$fh>) {
	$ordinal{$1} = $2 if /^\s*"(\w+)"\s*(?:=\s*"\w+"\s*)?\@(\d+)\s*$/;
	# This allows skipping ordinals which were used in older versions
	$sym_ord = $1 if /^\s*;\s*LAST_ORDINAL\s*=\s*(\d+)\s*$/;
      }
      $sym_ord < $_ and $sym_ord = $_ for values %ordinal; # Take the max
    }
    (my $v = $]) =~ s/(\d\.\d\d\d)(\d\d)$/$1_$2/;
    $v .= '-thread' if $ARCHNAME =~ /-thread/;
    (my $dll = $define{PERL_DLL}) =~ s/\.dll$//i;
    $v .= "\@$PATCHLEVEL" if $PATCHLEVEL;
    my $d = "DESCRIPTION '\@#perl5-porters\@perl.org:$v#\@ Perl interpreter, configured as $CONFIG_ARGS'";
    $d = substr($d, 0, 249) . "...'" if length $d > 253;
    print <<"---EOP---";
LIBRARY '$dll' INITINSTANCE TERMINSTANCE
$d
STACKSIZE 32768
CODE LOADONCALL
DATA LOADONCALL NONSHARED MULTIPLE
EXPORTS
---EOP---
}
elsif ($PLATFORM eq 'aix') {
    my $OSVER = `uname -v`;
    chop $OSVER;
    my $OSREL = `uname -r`;
    chop $OSREL;
    if ($OSVER > 4 || ($OSVER == 4 && $OSREL >= 3)) {
	print "#! ..\n";
    } else {
	print "#!\n";
    }
}
elsif ($PLATFORM eq 'netware') {
	if ($FILETYPE eq 'def') {
	print "LIBRARY perl514\n";
	print "DESCRIPTION 'Perl interpreter for NetWare'\n";
	print "EXPORTS\n";
	}
	if ($define{PERL_IMPLICIT_SYS}) {
	    output_symbol("perl_get_host_info");
	    output_symbol("perl_alloc_override");
	    output_symbol("perl_clone_host");
	}
}

my %skip;
my %export;

sub skip_symbols {
    my $list = shift;
    foreach my $symbol (@$list) {
	$skip{$symbol} = 1;
    }
}

sub emit_symbols {
    my $list = shift;
    foreach my $symbol (@$list) {
	my $skipsym = $symbol;
	# XXX hack
	if ($define{MULTIPLICITY}) {
	    $skipsym =~ s/^Perl_[GIT](\w+)_ptr$/PL_$1/;
	}
	emit_symbol($symbol) unless exists $skip{$skipsym};
    }
}

if ($PLATFORM eq 'win32') {
    skip_symbols [qw(
		     PL_statusvalue_vms
		     PL_archpat_auto
		     PL_cryptseen
		     PL_DBcv
		     PL_generation
		     PL_lastgotoprobe
		     PL_linestart
		     PL_modcount
		     PL_pending_ident
		     PL_sublex_info
		     PL_timesbuf
		     main
		     Perl_ErrorNo
		     Perl_GetVars
		     Perl_do_exec3
		     Perl_do_ipcctl
		     Perl_do_ipcget
		     Perl_do_msgrcv
		     Perl_do_msgsnd
		     Perl_do_semop
		     Perl_do_shmio
		     Perl_dump_fds
		     Perl_init_thread_intern
		     Perl_my_bzero
		     Perl_my_bcopy
		     Perl_my_htonl
		     Perl_my_ntohl
		     Perl_my_swap
		     Perl_my_chsize
		     Perl_same_dirent
		     Perl_setenv_getix
		     Perl_unlnk
		     Perl_watch
		     Perl_safexcalloc
		     Perl_safexmalloc
		     Perl_safexfree
		     Perl_safexrealloc
		     Perl_my_memcmp
		     Perl_my_memset
		     PL_cshlen
		     PL_cshname
		     PL_opsave
		     Perl_do_exec
		     Perl_getenv_len
		     Perl_my_pclose
		     Perl_my_popen
		     Perl_my_sprintf
		     )];
}
else {
    skip_symbols [qw(
		     Perl_do_spawn
		     Perl_do_spawn_nowait
		     Perl_do_aspawn
		     )];
}
if ($PLATFORM eq 'wince') {
    skip_symbols [qw(
		     PL_statusvalue_vms
		     PL_archpat_auto
		     PL_cryptseen
		     PL_DBcv
		     PL_generation
		     PL_lastgotoprobe
		     PL_linestart
		     PL_modcount
		     PL_pending_ident
		     PL_sublex_info
		     PL_timesbuf
		     PL_collation_ix
		     PL_collation_name
		     PL_collation_standard
		     PL_collxfrm_base
		     PL_collxfrm_mult
		     PL_numeric_compat1
		     PL_numeric_local
		     PL_numeric_name
		     PL_numeric_radix_sv
		     PL_numeric_standard
		     PL_vtbl_collxfrm
		     Perl_sv_collxfrm
		     setgid
		     setuid
		     win32_free_childdir
		     win32_free_childenv
		     win32_get_childdir
		     win32_get_childenv
		     win32_spawnvp
		     main
		     Perl_ErrorNo
		     Perl_GetVars
		     Perl_do_exec3
		     Perl_do_ipcctl
		     Perl_do_ipcget
		     Perl_do_msgrcv
		     Perl_do_msgsnd
		     Perl_do_semop
		     Perl_do_shmio
		     Perl_dump_fds
		     Perl_init_thread_intern
		     Perl_my_bzero
		     Perl_my_bcopy
		     Perl_my_htonl
		     Perl_my_ntohl
		     Perl_my_swap
		     Perl_my_chsize
		     Perl_same_dirent
		     Perl_setenv_getix
		     Perl_unlnk
		     Perl_watch
		     Perl_safexcalloc
		     Perl_safexmalloc
		     Perl_safexfree
		     Perl_safexrealloc
		     Perl_my_memcmp
		     Perl_my_memset
		     PL_cshlen
		     PL_cshname
		     PL_opsave
		     Perl_do_exec
		     Perl_getenv_len
		     Perl_my_pclose
		     Perl_my_popen
		     Perl_my_sprintf
		     )];
}
elsif ($PLATFORM eq 'aix') {
    skip_symbols([qw(
		     Perl_dump_fds
		     Perl_ErrorNo
		     Perl_GetVars
		     Perl_my_bcopy
		     Perl_my_bzero
		     Perl_my_chsize
		     Perl_my_htonl
		     Perl_my_memcmp
		     Perl_my_memset
		     Perl_my_ntohl
		     Perl_my_swap
		     Perl_safexcalloc
		     Perl_safexfree
		     Perl_safexmalloc
		     Perl_safexrealloc
		     Perl_same_dirent
		     Perl_unlnk
		     Perl_sys_intern_clear
		     Perl_sys_intern_dup
		     Perl_sys_intern_init
		     Perl_my_sprintf
		     PL_cryptseen
		     PL_opsave
		     PL_statusvalue_vms
		     PL_sys_intern
		     )]);
    skip_symbols([qw(
		     Perl_signbit
		     )])
	if $define{'HAS_SIGNBIT'};
    emit_symbols([qw(
		     boot_DynaLoader
		     )]);
}
elsif ($PLATFORM eq 'os2') {
    emit_symbols([qw(
		    ctermid
		    get_sysinfo
		    Perl_OS2_init
		    Perl_OS2_init3
		    Perl_OS2_term
		    OS2_Perl_data
		    dlopen
		    dlsym
		    dlerror
		    dlclose
		    dup2
		    dup
		    my_tmpfile
		    my_tmpnam
		    my_flock
		    my_rmdir
		    my_mkdir
		    my_getpwuid
		    my_getpwnam
		    my_getpwent
		    my_setpwent
		    my_endpwent
		    fork_with_resources
		    croak_with_os2error
		    setgrent
		    endgrent
		    getgrent
		    malloc_mutex
		    threads_mutex
		    nthreads
		    nthreads_cond
		    os2_cond_wait
		    os2_stat
		    os2_execname
		    async_mssleep
		    msCounter
		    InfoTable
		    pthread_join
		    pthread_create
		    pthread_detach
		    XS_Cwd_change_drive
		    XS_Cwd_current_drive
		    XS_Cwd_extLibpath
		    XS_Cwd_extLibpath_set
		    XS_Cwd_sys_abspath
		    XS_Cwd_sys_chdir
		    XS_Cwd_sys_cwd
		    XS_Cwd_sys_is_absolute
		    XS_Cwd_sys_is_relative
		    XS_Cwd_sys_is_rooted
		    XS_DynaLoader_mod2fname
		    XS_File__Copy_syscopy
		    Perl_Register_MQ
		    Perl_Deregister_MQ
		    Perl_Serve_Messages
		    Perl_Process_Messages
		    init_PMWIN_entries
		    PMWIN_entries
		    Perl_hab_GET
		    loadByOrdinal
		    pExtFCN
		    os2error
		    ResetWinError
		    CroakWinError
		    PL_do_undump
		    )]);
    emit_symbols([qw(os2_cond_wait
		     pthread_join
		     pthread_create
		     pthread_detach
		    )])
      if $define{'USE_5005THREADS'} or $define{'USE_ITHREADS'};
}
elsif ($PLATFORM eq 'netware') {
	skip_symbols [qw(
			PL_statusvalue_vms
			PL_archpat_auto
			PL_cryptseen
			PL_DBcv
			PL_generation
			PL_lastgotoprobe
			PL_linestart
			PL_modcount
			PL_pending_ident
			PL_sublex_info
			PL_timesbuf
			main
			Perl_ErrorNo
			Perl_GetVars
			Perl_do_exec3
			Perl_do_ipcctl
			Perl_do_ipcget
			Perl_do_msgrcv
			Perl_do_msgsnd
			Perl_do_semop
			Perl_do_shmio
			Perl_dump_fds
			Perl_init_thread_intern
			Perl_my_bzero
			Perl_my_htonl
			Perl_my_ntohl
			Perl_my_swap
			Perl_my_chsize
			Perl_same_dirent
			Perl_setenv_getix
			Perl_unlnk
			Perl_watch
			Perl_safexcalloc
			Perl_safexmalloc
			Perl_safexfree
			Perl_safexrealloc
			Perl_my_memcmp
			Perl_my_memset
			PL_cshlen
			PL_cshname
			PL_opsave
			Perl_do_exec
			Perl_getenv_len
			Perl_my_pclose
			Perl_my_popen
			Perl_sys_intern_init
			Perl_sys_intern_dup
			Perl_sys_intern_clear
			Perl_my_bcopy
			Perl_PerlIO_write
			Perl_PerlIO_unread
			Perl_PerlIO_tell
			Perl_PerlIO_stdout
			Perl_PerlIO_stdin
			Perl_PerlIO_stderr
			Perl_PerlIO_setlinebuf
			Perl_PerlIO_set_ptrcnt
			Perl_PerlIO_set_cnt
			Perl_PerlIO_seek
			Perl_PerlIO_read
			Perl_PerlIO_get_ptr
			Perl_PerlIO_get_cnt
			Perl_PerlIO_get_bufsiz
			Perl_PerlIO_get_base
			Perl_PerlIO_flush
			Perl_PerlIO_fill
			Perl_PerlIO_fileno
			Perl_PerlIO_error
			Perl_PerlIO_eof
			Perl_PerlIO_close
			Perl_PerlIO_clearerr
			PerlIO_perlio
			)];
}

unless ($define{'DEBUGGING'}) {
    skip_symbols [qw(
		    Perl_deb_growlevel
		    Perl_debop
		    Perl_debprofdump
		    Perl_debstack
		    Perl_debstackptrs
		    Perl_pad_sv
		    Perl_hv_assert
		    PL_block_type
		    PL_watchaddr
		    PL_watchok
		    PL_watch_pvx
		    )];
}

if ($define{'PERL_IMPLICIT_CONTEXT'}) {
    skip_symbols [qw(
		    PL_sig_sv
		    )];
}

if ($define{'PERL_IMPLICIT_SYS'}) {
    skip_symbols [qw(
		    Perl_getenv_len
		    Perl_my_popen
		    Perl_my_pclose
		    )];
}
else {
    skip_symbols [qw(
		    PL_Mem
		    PL_MemShared
		    PL_MemParse
		    PL_Env
		    PL_StdIO
		    PL_LIO
		    PL_Dir
		    PL_Sock
		    PL_Proc
		    )];
}

unless ($define{'PERL_OLD_COPY_ON_WRITE'}) {
    skip_symbols [qw(
		    Perl_sv_setsv_cow
		  )];
}

unless ($define{'USE_REENTRANT_API'}) {
    skip_symbols [qw(
		    PL_reentrant_buffer
		    )];
}

if ($define{'MYMALLOC'}) {
    emit_symbols [qw(
		    Perl_dump_mstats
		    Perl_get_mstats
		    Perl_strdup
		    Perl_putenv
		    MallocCfg_ptr
		    MallocCfgP_ptr
		    )];
    if ($define{'USE_ITHREADS'}) {
	emit_symbols [qw(
			PL_malloc_mutex
			)];
    }
    else {
	skip_symbols [qw(
			PL_malloc_mutex
			)];
    }
}
else {
    skip_symbols [qw(
		    PL_malloc_mutex
		    Perl_dump_mstats
		    Perl_get_mstats
		    Perl_malloced_size
		    Perl_malloc_good_size
		    MallocCfg_ptr
		    MallocCfgP_ptr
		    )];
}

if ($define{'PERL_USE_SAFE_PUTENV'}) {
    skip_symbols [qw(
                   PL_use_safe_putenv
                  )];
}

unless ($define{'USE_ITHREADS'}) {
    skip_symbols [qw(
		    PL_thr_key
		    )];
}

# USE_5005THREADS symbols. Kept as reference for easier removal
    skip_symbols [qw(
		    PL_sv_mutex
		    PL_strtab_mutex
		    PL_svref_mutex
		    PL_cred_mutex
		    PL_eval_mutex
		    PL_fdpid_mutex
		    PL_sv_lock_mutex
		    PL_eval_cond
		    PL_eval_owner
		    PL_threads_mutex
		    PL_nthreads
		    PL_nthreads_cond
		    PL_threadnum
		    PL_threadsv_names
		    PL_thrsv
		    PL_vtbl_mutex
		    Perl_condpair_magic
		    Perl_new_struct_thread
		    Perl_per_thread_magicals
		    Perl_thread_create
		    Perl_find_threadsv
		    Perl_unlock_condpair
		    Perl_magic_mutexfree
		    Perl_sv_lock
		    )];

unless ($define{'USE_ITHREADS'}) {
    skip_symbols [qw(
		    PL_op_mutex
		    PL_regex_pad
		    PL_regex_padav
		    PL_sharedsv_space
		    PL_sharedsv_space_mutex
		    PL_dollarzero_mutex
		    PL_hints_mutex
		    PL_my_ctx_mutex
		    PL_perlio_mutex
		    PL_regdupe
		    Perl_clone_params_del
		    Perl_clone_params_new
		    Perl_parser_dup
		    Perl_dirp_dup
		    Perl_cx_dup
		    Perl_si_dup
		    Perl_any_dup
		    Perl_ss_dup
		    Perl_fp_dup
		    Perl_gp_dup
		    Perl_he_dup
		    Perl_mg_dup
		    Perl_mro_meta_dup
		    Perl_re_dup_guts
		    Perl_sv_dup
		    Perl_sv_dup_inc
		    Perl_rvpv_dup
		    Perl_hek_dup
		    Perl_sys_intern_dup
		    perl_clone
		    perl_clone_using
		    Perl_sharedsv_find
		    Perl_sharedsv_init
		    Perl_sharedsv_lock
		    Perl_sharedsv_new
		    Perl_sharedsv_thrcnt_dec
		    Perl_sharedsv_thrcnt_inc
		    Perl_sharedsv_unlock
		    Perl_stashpv_hvname_match
		    Perl_regdupe_internal
		    Perl_newPADOP
		    )];
}

unless ($define{'PERL_IMPLICIT_CONTEXT'}) {
    skip_symbols [qw(
		    PL_my_cxt_index
		    PL_my_cxt_list
		    PL_my_cxt_size
		    PL_my_cxt_keys
		    Perl_croak_nocontext
		    Perl_die_nocontext
		    Perl_deb_nocontext
		    Perl_form_nocontext
		    Perl_load_module_nocontext
		    Perl_mess_nocontext
		    Perl_warn_nocontext
		    Perl_warner_nocontext
		    Perl_newSVpvf_nocontext
		    Perl_sv_catpvf_nocontext
		    Perl_sv_setpvf_nocontext
		    Perl_sv_catpvf_mg_nocontext
		    Perl_sv_setpvf_mg_nocontext
		    Perl_my_cxt_init
		    Perl_my_cxt_index
		    )];
}

unless ($define{'PERL_IMPLICIT_SYS'}) {
    skip_symbols [qw(
		    perl_alloc_using
		    perl_clone_using
		    )];
}

unless ($define{'FAKE_THREADS'}) {
    skip_symbols [qw(PL_curthr)];
}

unless ($define{'PL_OP_SLAB_ALLOC'}) {
    skip_symbols [qw(
                     PL_OpPtr
                     PL_OpSlab
                     PL_OpSpace
		     Perl_Slab_Alloc
		     Perl_Slab_Free
                    )];
}

unless ($define{'PERL_DEBUG_READONLY_OPS'}) {
    skip_symbols [qw(
		    PL_slab_count
		    PL_slabs
                  )];
}

unless ($define{'THREADS_HAVE_PIDS'}) {
    skip_symbols [qw(PL_ppid)];
}

unless ($define{'PERL_NEED_APPCTX'}) {
    skip_symbols [qw(
		    PL_appctx
		    )];
}

unless ($define{'PERL_NEED_TIMESBASE'}) {
    skip_symbols [qw(
		    PL_timesbase
		    )];
}

unless ($define{'DEBUG_LEAKING_SCALARS'}) {
    skip_symbols [qw(
		    PL_sv_serial
		    )];
}

unless ($define{'DEBUG_LEAKING_SCALARS_FORK_DUMP'}) {
    skip_symbols [qw(
		    PL_dumper_fd
		    )];
}
unless ($define{'PERL_DONT_CREATE_GVSV'}) {
    skip_symbols [qw(
		     Perl_gv_SVadd
		    )];
}
if ($define{'SPRINTF_RETURNS_STRLEN'}) {
    skip_symbols [qw(
		     Perl_my_sprintf
		    )];
}
unless ($define{'PERL_USES_PL_PIDSTATUS'}) {
    skip_symbols [qw(
		     Perl_pidgone
		     PL_pidstatus
		    )];
}

unless ($define{'PERL_TRACK_MEMPOOL'}) {
    skip_symbols [qw(
                     PL_memory_debug_header
                    )];
}

if ($define{'PERL_MAD'}) {
    skip_symbols [qw(
		     PL_nextval
		     PL_nexttype
		     )];
} else {
    skip_symbols [qw(
		    PL_madskills
		    PL_xmlfp
		    PL_lasttoke
		    PL_realtokenstart
		    PL_faketokens
		    PL_thismad
		    PL_thistoken
		    PL_thisopen
		    PL_thisstuff
		    PL_thisclose
		    PL_thiswhite
		    PL_nextwhite
		    PL_skipwhite
		    PL_endwhite
		    PL_curforce
		    Perl_pad_peg
		    Perl_xmldump_indent
		    Perl_xmldump_vindent
		    Perl_xmldump_all
		    Perl_xmldump_packsubs
		    Perl_xmldump_sub
		    Perl_xmldump_form
		    Perl_xmldump_eval
		    Perl_sv_catxmlsv
		    Perl_sv_catxmlpvn
		    Perl_sv_xmlpeek
		    Perl_do_pmop_xmldump
		    Perl_pmop_xmldump
		    Perl_do_op_xmldump
		    Perl_op_xmldump
		    )];
}

unless ($define{'MULTIPLICITY'}) {
    skip_symbols [qw(
		    PL_interp_size
		    PL_interp_size_5_10_0
		    )];
}

unless ($define{'PERL_GLOBAL_STRUCT'}) {
    skip_symbols [qw(
		    PL_global_struct_size
		    )];
}

unless ($define{'PERL_GLOBAL_STRUCT_PRIVATE'}) {
    skip_symbols [qw(
		    PL_my_cxt_keys
		    Perl_my_cxt_index
		    )];
}

unless ($define{'d_mmap'}) {
    skip_symbols [qw(
		    PL_mmap_page_size
		    )];
}

if ($define{'d_sigaction'}) {
    skip_symbols [qw(
		    PL_sig_trapped
		    )];
}

if ($^O ne 'vms') {
    # VMS does its own thing for these symbols.
    skip_symbols [qw(PL_sig_handlers_initted
                     PL_sig_ignoring
                     PL_sig_defaulting)];
}  

sub readvar {
    my $file = shift;
    my $proc = shift || sub { "PL_$_[2]" };
    open(VARS,$file) || die "Cannot open $file: $!\n";
    my @syms;
    while (<VARS>) {
	# All symbols have a Perl_ prefix because that's what embed.h
	# sticks in front of them.  The A?I?S?C? is strictly speaking
	# wrong.
	push(@syms, &$proc($1,$2,$3)) if (/\bPERLVAR(A?I?S?C?)\(([IGT])(\w+)/);
    }
    close(VARS);
    return \@syms;
}

if ($define{'PERL_GLOBAL_STRUCT'}) {
    my $global = readvar($perlvars_h);
    skip_symbols $global;
    emit_symbol('Perl_GetVars');
    emit_symbols [qw(PL_Vars PL_VarsPtr)] unless $CCTYPE eq 'GCC';
} else {
    skip_symbols [qw(Perl_init_global_struct Perl_free_global_struct)];
}

# functions from *.sym files

my @syms = ($global_sym, $globvar_sym);

# Symbols that are the public face of the PerlIO layers implementation
# These are in _addition to_ the public face of the abstraction
# and need to be exported to allow XS modules to implement layers
my @layer_syms = qw(
		    PerlIOBase_binmode
		    PerlIOBase_clearerr
		    PerlIOBase_close
		    PerlIOBase_dup
		    PerlIOBase_eof
		    PerlIOBase_error
		    PerlIOBase_fileno
		    PerlIOBase_noop_fail
		    PerlIOBase_noop_ok
		    PerlIOBase_popped
		    PerlIOBase_pushed
		    PerlIOBase_read
		    PerlIOBase_setlinebuf
		    PerlIOBase_unread
		    PerlIOBuf_bufsiz
		    PerlIOBuf_close
		    PerlIOBuf_dup
		    PerlIOBuf_fill
		    PerlIOBuf_flush
		    PerlIOBuf_get_base
		    PerlIOBuf_get_cnt
		    PerlIOBuf_get_ptr
		    PerlIOBuf_open
		    PerlIOBuf_popped
		    PerlIOBuf_pushed
		    PerlIOBuf_read
		    PerlIOBuf_seek
		    PerlIOBuf_set_ptrcnt
		    PerlIOBuf_tell
		    PerlIOBuf_unread
		    PerlIOBuf_write
		    PerlIO_allocate
		    PerlIO_apply_layera
		    PerlIO_apply_layers
		    PerlIO_arg_fetch
		    PerlIO_debug
		    PerlIO_define_layer
		    PerlIO_find_layer
		    PerlIO_isutf8
		    PerlIO_layer_fetch
		    PerlIO_list_alloc
		    PerlIO_list_free
		    PerlIO_modestr
		    PerlIO_parse_layers
		    PerlIO_pending
		    PerlIO_perlio
		    PerlIO_pop
		    PerlIO_push
		    PerlIO_sv_dup
		    Perl_PerlIO_clearerr
		    Perl_PerlIO_close
		    Perl_PerlIO_context_layers
		    Perl_PerlIO_eof
		    Perl_PerlIO_error
		    Perl_PerlIO_fileno
		    Perl_PerlIO_fill
		    Perl_PerlIO_flush
		    Perl_PerlIO_get_base
		    Perl_PerlIO_get_bufsiz
		    Perl_PerlIO_get_cnt
		    Perl_PerlIO_get_ptr
		    Perl_PerlIO_read
		    Perl_PerlIO_seek
		    Perl_PerlIO_set_cnt
		    Perl_PerlIO_set_ptrcnt
		    Perl_PerlIO_setlinebuf
		    Perl_PerlIO_stderr
		    Perl_PerlIO_stdin
		    Perl_PerlIO_stdout
		    Perl_PerlIO_tell
		    Perl_PerlIO_unread
		    Perl_PerlIO_write
);
if ($PLATFORM eq 'netware') {
    push(@layer_syms,'PL_def_layerlist','PL_known_layers','PL_perlio');
}

if ($define{'USE_PERLIO'}) {
    # Export the symols that make up the PerlIO abstraction, regardless
    # of its implementation - read from a file
    push @syms, $perlio_sym;

    # This part is then dependent on how the abstraction is implemented
    if ($define{'USE_SFIO'}) {
	# Old legacy non-stdio "PerlIO"
	skip_symbols \@layer_syms;
	skip_symbols [qw(perlsio_binmode)];
	# SFIO defines most of the PerlIO routines as macros
	# So undo most of what $perlio_sym has just done - d'oh !
	# Perhaps it would be better to list the ones which do exist
	# And emit them
	skip_symbols [qw(
			 PerlIO_canset_cnt
			 PerlIO_clearerr
			 PerlIO_close
			 PerlIO_eof
			 PerlIO_error
			 PerlIO_exportFILE
			 PerlIO_fast_gets
			 PerlIO_fdopen
			 PerlIO_fileno
			 PerlIO_findFILE
			 PerlIO_flush
			 PerlIO_get_base
			 PerlIO_get_bufsiz
			 PerlIO_get_cnt
			 PerlIO_get_ptr
			 PerlIO_getc
			 PerlIO_getname
			 PerlIO_has_base
			 PerlIO_has_cntptr
			 PerlIO_importFILE
			 PerlIO_open
			 PerlIO_printf
			 PerlIO_putc
			 PerlIO_puts
			 PerlIO_read
			 PerlIO_releaseFILE
			 PerlIO_reopen
			 PerlIO_rewind
			 PerlIO_seek
			 PerlIO_set_cnt
			 PerlIO_set_ptrcnt
			 PerlIO_setlinebuf
			 PerlIO_sprintf
			 PerlIO_stderr
			 PerlIO_stdin
			 PerlIO_stdout
			 PerlIO_stdoutf
			 PerlIO_tell
			 PerlIO_ungetc
			 PerlIO_vprintf
			 PerlIO_write
			 PerlIO_perlio
			 Perl_PerlIO_clearerr
			 Perl_PerlIO_close
			 Perl_PerlIO_eof
			 Perl_PerlIO_error
			 Perl_PerlIO_fileno
			 Perl_PerlIO_fill
			 Perl_PerlIO_flush
			 Perl_PerlIO_get_base
			 Perl_PerlIO_get_bufsiz
			 Perl_PerlIO_get_cnt
			 Perl_PerlIO_get_ptr
			 Perl_PerlIO_read
			 Perl_PerlIO_seek
			 Perl_PerlIO_set_cnt
			 Perl_PerlIO_set_ptrcnt
			 Perl_PerlIO_setlinebuf
			 Perl_PerlIO_stderr
			 Perl_PerlIO_stdin
			 Perl_PerlIO_stdout
			 Perl_PerlIO_tell
			 Perl_PerlIO_unread
			 Perl_PerlIO_write
                         PL_def_layerlist
                         PL_known_layers
                         PL_perlio
			 )];
    }
    else {
	# PerlIO with layers - export implementation
	emit_symbols \@layer_syms;
	emit_symbols [qw(perlsio_binmode)];
    }
    if ($define{'USE_ITHREADS'}) {
	emit_symbols [qw(
			PL_perlio_mutex
			)];
    }
    else {
	skip_symbols [qw(
			PL_perlio_mutex
			)];
    }
} else {
	# -Uuseperlio
	# Skip the PerlIO layer symbols - although
	# nothing should have exported them anyway.
	skip_symbols \@layer_syms;
	skip_symbols [qw(
			perlsio_binmode
			PL_def_layerlist
			PL_known_layers
			PL_perlio
			PL_perlio_debug_fd
			PL_perlio_fd_refcnt
			PL_perlio_fd_refcnt_size
			)];

	# Also do NOT add abstraction symbols from $perlio_sym
	# abstraction is done as #define to stdio
	# Remaining remnants that _may_ be functions
	# are handled in <DATA>
}

for my $syms (@syms) {
    open (GLOBAL, "<$syms") || die "failed to open $syms: $!\n";
    while (<GLOBAL>) {
	next if (!/^[A-Za-z]/);
	# Functions have a Perl_ prefix
	# Variables have a PL_ prefix
	chomp($_);
	my $symbol = ($syms =~ /var\.sym$/i ? "PL_" : "");
	$symbol .= $_;
	emit_symbol($symbol) unless exists $skip{$symbol};
    }
    close(GLOBAL);
}

# variables

if ($define{'MULTIPLICITY'} && $define{PERL_GLOBAL_STRUCT}) {
    for my $f ($perlvars_h) {
	my $glob = readvar($f, sub { "Perl_" . $_[1] . $_[2] . "_ptr" });
	emit_symbols $glob;
    }
    # XXX AIX seems to want the perlvars.h symbols, for some reason
    if ($PLATFORM eq 'aix' or $PLATFORM eq 'os2') {	# OS/2 needs PL_thr_key
	my $glob = readvar($perlvars_h);
	emit_symbols $glob;
    }
}
else {
    unless ($define{'PERL_GLOBAL_STRUCT'}) {
	my $glob = readvar($perlvars_h);
	emit_symbols $glob;
    }
    unless ($define{MULTIPLICITY}) {
	my $glob = readvar($intrpvar_h);
	emit_symbols $glob;
    }
}

sub try_symbol {
    my $symbol = shift;

    return if $symbol !~ /^[A-Za-z_]/;
    return if $symbol =~ /^\#/;
    $symbol =~s/\r//g;
    chomp($symbol);
    return if exists $skip{$symbol};
    emit_symbol($symbol);
}

while (<DATA>) {
    try_symbol($_);
}

if ($PLATFORM =~ /^win(?:32|ce)$/) {
    foreach my $symbol (qw(
			    setuid
			    setgid
			    boot_DynaLoader
			    Perl_init_os_extras
			    Perl_thread_create
			    Perl_win32_init
			    Perl_win32_term
			    RunPerl
			    win32_async_check
			    win32_errno
			    win32_environ
			    win32_abort
			    win32_fstat
			    win32_stat
			    win32_pipe
			    win32_popen
			    win32_pclose
			    win32_rename
			    win32_setmode
			    win32_chsize
			    win32_lseek
			    win32_tell
			    win32_dup
			    win32_dup2
			    win32_open
			    win32_close
			    win32_eof
			    win32_isatty
			    win32_read
			    win32_write
			    win32_spawnvp
			    win32_mkdir
			    win32_rmdir
			    win32_chdir
			    win32_flock
			    win32_execv
			    win32_execvp
			    win32_htons
			    win32_ntohs
			    win32_htonl
			    win32_ntohl
			    win32_inet_addr
			    win32_inet_ntoa
			    win32_socket
			    win32_bind
			    win32_listen
			    win32_accept
			    win32_connect
			    win32_send
			    win32_sendto
			    win32_recv
			    win32_recvfrom
			    win32_shutdown
			    win32_closesocket
			    win32_ioctlsocket
			    win32_setsockopt
			    win32_getsockopt
			    win32_getpeername
			    win32_getsockname
			    win32_gethostname
			    win32_gethostbyname
			    win32_gethostbyaddr
			    win32_getprotobyname
			    win32_getprotobynumber
			    win32_getservbyname
			    win32_getservbyport
			    win32_select
			    win32_endhostent
			    win32_endnetent
			    win32_endprotoent
			    win32_endservent
			    win32_getnetent
			    win32_getnetbyname
			    win32_getnetbyaddr
			    win32_getprotoent
			    win32_getservent
			    win32_sethostent
			    win32_setnetent
			    win32_setprotoent
			    win32_setservent
			    win32_getenv
			    win32_putenv
			    win32_perror
			    win32_malloc
			    win32_calloc
			    win32_realloc
			    win32_free
			    win32_sleep
			    win32_times
			    win32_access
			    win32_alarm
			    win32_chmod
			    win32_open_osfhandle
			    win32_get_osfhandle
			    win32_ioctl
			    win32_link
			    win32_unlink
			    win32_utime
			    win32_gettimeofday
			    win32_uname
			    win32_wait
			    win32_waitpid
			    win32_kill
			    win32_str_os_error
			    win32_opendir
			    win32_readdir
			    win32_telldir
			    win32_seekdir
			    win32_rewinddir
			    win32_closedir
			    win32_longpath
			    win32_ansipath
			    win32_os_id
			    win32_getpid
			    win32_crypt
			    win32_dynaload
			    win32_get_childenv
			    win32_free_childenv
			    win32_clearenv
			    win32_get_childdir
			    win32_free_childdir
			    win32_stdin
			    win32_stdout
			    win32_stderr
			    win32_ferror
			    win32_feof
			    win32_strerror
			    win32_fprintf
			    win32_printf
			    win32_vfprintf
			    win32_vprintf
			    win32_fread
			    win32_fwrite
			    win32_fopen
			    win32_fdopen
			    win32_freopen
			    win32_fclose
			    win32_fputs
			    win32_fputc
			    win32_ungetc
			    win32_getc
			    win32_fileno
			    win32_clearerr
			    win32_fflush
			    win32_ftell
			    win32_fseek
			    win32_fgetpos
			    win32_fsetpos
			    win32_rewind
			    win32_tmpfile
			    win32_setbuf
			    win32_setvbuf
			    win32_flushall
			    win32_fcloseall
			    win32_fgets
			    win32_gets
			    win32_fgetc
			    win32_putc
			    win32_puts
			    win32_getchar
			    win32_putchar
			   ))
    {
	try_symbol($symbol);
    }
    if ($CCTYPE eq "BORLAND") {
	try_symbol('_matherr');
    }
}
elsif ($PLATFORM eq 'os2') {
    my (%mapped, @missing);
    open MAP, 'miniperl.map' or die 'Cannot read miniperl.map';
    /^\s*[\da-f:]+\s+(\w+)/i and $mapped{$1}++ foreach <MAP>;
    close MAP or die 'Cannot close miniperl.map';

    @missing = grep { !exists $mapped{$_} }
		    keys %export;
    @missing = grep { !exists $exportperlmalloc{$_} } @missing;
    delete $export{$_} foreach @missing;
}
elsif ($PLATFORM eq 'netware') {
foreach my $symbol (qw(
			boot_DynaLoader
			Perl_init_os_extras
			Perl_thread_create
			Perl_nw5_init
			RunPerl
			AllocStdPerl
			FreeStdPerl
			do_spawn2
			do_aspawn
			nw_uname
			nw_stdin
			nw_stdout
			nw_stderr
			nw_feof
			nw_ferror
			nw_fopen
			nw_fclose
			nw_clearerr
			nw_getc
			nw_fgets
			nw_fputc
			nw_fputs
			nw_fflush
			nw_ungetc
			nw_fileno
			nw_fdopen
			nw_freopen
			nw_fread
			nw_fwrite
			nw_setbuf
			nw_setvbuf
			nw_vfprintf
			nw_ftell
			nw_fseek
			nw_rewind
			nw_tmpfile
			nw_fgetpos
			nw_fsetpos
			nw_dup
			nw_access
			nw_chmod
			nw_chsize
			nw_close
			nw_dup2
			nw_flock
			nw_isatty
			nw_link
			nw_lseek
			nw_stat
			nw_mktemp
			nw_open
			nw_read
			nw_rename
			nw_setmode
			nw_unlink
			nw_utime
			nw_write
			nw_chdir
			nw_rmdir
			nw_closedir
			nw_opendir
			nw_readdir
			nw_rewinddir
			nw_seekdir
			nw_telldir
			nw_htonl
			nw_htons
			nw_ntohl
			nw_ntohs
			nw_accept
			nw_bind
			nw_connect
			nw_endhostent
			nw_endnetent
			nw_endprotoent
			nw_endservent
			nw_gethostbyaddr
			nw_gethostbyname
			nw_gethostent
			nw_gethostname
			nw_getnetbyaddr
			nw_getnetbyname
			nw_getnetent
			nw_getpeername
			nw_getprotobyname
			nw_getprotobynumber
			nw_getprotoent
			nw_getservbyname
			nw_getservbyport
			nw_getservent
			nw_getsockname
			nw_getsockopt
			nw_inet_addr
			nw_listen
			nw_socket
			nw_recv
			nw_recvfrom
			nw_select
			nw_send
			nw_sendto
			nw_sethostent
			nw_setnetent
			nw_setprotoent
			nw_setservent
			nw_setsockopt
			nw_inet_ntoa
			nw_shutdown
			nw_crypt
			nw_execvp
			nw_kill
			nw_Popen
			nw_Pclose
			nw_Pipe
			nw_times
			nw_waitpid
			nw_getpid
			nw_spawnvp
			nw_os_id
			nw_open_osfhandle
			nw_get_osfhandle
			nw_abort
			nw_sleep
			nw_wait
			nw_dynaload
			nw_strerror
			fnFpSetMode
			fnInsertHashListAddrs
			fnGetHashListAddrs
			Perl_deb
			Perl_sv_setsv
			Perl_sv_catsv
			Perl_sv_catpvn
			Perl_sv_2pv
			nw_freeenviron
			Remove_Thread_Ctx
			   ))
    {
	try_symbol($symbol);
    }
}

# records of type boot_module for statically linked modules (except Dynaloader)
$static_ext =~ s/\//__/g;
$static_ext =~ s/\bDynaLoader\b//;
my @stat_mods = map {"boot_$_"} grep {/\S/} split /\s+/, $static_ext;
foreach my $symbol (@stat_mods)
    {
	try_symbol($symbol);
    }

try_symbol("init_Win32CORE") if $static_ext =~ /\bWin32CORE\b/;

# Now all symbols should be defined because
# next we are going to output them.

foreach my $symbol (sort keys %export) {
    output_symbol($symbol);
}

if ($PLATFORM eq 'os2') {
	print <<EOP;
    dll_perlmain=main
    fill_extLibpath
    dir_subst
    Perl_OS2_handler_install

; LAST_ORDINAL=$sym_ord
EOP
}

sub emit_symbol {
    my $symbol = shift;
    chomp($symbol);
    $export{$symbol} = 1;
}

sub output_symbol {
    my $symbol = shift;
    if ($PLATFORM =~ /^win(?:32|ce)$/) {
	$symbol = "_$symbol" if $CCTYPE eq 'BORLAND';
	print "\t$symbol\n";
# XXX: binary compatibility between compilers is an exercise
# in frustration :-(
#        if ($CCTYPE eq "BORLAND") {
#	    # workaround Borland quirk by exporting both the straight
#	    # name and a name with leading underscore.  Note the
#	    # alias *must* come after the symbol itself, if both
#	    # are to be exported. (Linker bug?)
#	    print "\t_$symbol\n";
#	    print "\t$symbol = _$symbol\n";
#	}
#	elsif ($CCTYPE eq 'GCC') {
#	    # Symbols have leading _ whole process is $%@"% slow
#	    # so skip aliases for now
#	    nprint "\t$symbol\n";
#	}
#	else {
#	    # for binary coexistence, export both the symbol and
#	    # alias with leading underscore
#	    print "\t$symbol\n";
#	    print "\t_$symbol = $symbol\n";
#	}
    }
    elsif ($PLATFORM eq 'os2') {
	printf qq(    %-31s \@%s\n),
	  qq("$symbol"), $ordinal{$symbol} || ++$sym_ord;
	printf qq(    %-31s \@%s\n),
	  qq("$exportperlmalloc{$symbol}" = "$symbol"),
	  $ordinal{$exportperlmalloc{$symbol}} || ++$sym_ord
	  if $exportperlmalloc and exists $exportperlmalloc{$symbol};
    }
    elsif ($PLATFORM eq 'aix') {
	print "$symbol\n";
    }
	elsif ($PLATFORM eq 'netware') {
	print "\t$symbol,\n";
	}
}

1;
__DATA__
# Oddities from PerlIO
PerlIO_binmode
PerlIO_getpos
PerlIO_init
PerlIO_setpos
PerlIO_sprintf
PerlIO_sv_dup
PerlIO_tmpfile
PerlIO_vsprintf