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#!/usr/bin/perl -w

# $Id: vbomconv 518 2013-05-12 16:45:02Z mueller $

#

# Copyright 2007-2012 by Walter F.J. Mueller 

#

# This program is free software; you may redistribute and/or modify it under

# the terms of the GNU General Public License as published by the Free

# Software Foundation, either version 2, or at your option any later version.

#

# This program is distributed in the hope that it will be useful, but

# WITHOUT ANY WARRANTY, without even the implied warranty of MERCHANTABILITY

# or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

# for complete details.

#

#  Revision History:

# Date         Rev Version  Comment

# 2012-02-05   456   1.9.4  redo filename substitution (= and :); add --get_top

# 2012-01-02   448   1.9.3  use in ghdl_m -fexplicit also when simprim used

# 2011-11-27   433   1.9.2  use in ghdl_m -fexplicit when unisim used

# 2011-08-13   405   1.9.1  always write 'vhdl' into xst prj files again; for

#                           -xst_export: remove opt file export, add ucf_cpp

#                           handling

# 2011-06-26   385   1.9    add --ise_path, pass it to vbomconv --xst_prj

# 2011-06-09   383   1.8.6  fix xst_vhdl.opt logic (use rtl/vlib now)

# 2010-07-03   312   1.8.5  add --flist action

# 2010-06-03   299   1.8.4  generate ucf->ncd dependencies in dep_xst

# 2010-04-26   284   1.8.3  add _[sft]sim support for ISim

# 2009-11-28   253   1.8.2  fixup print_help...;

# 2009-11-22   252   1.8.1  add (export|dep)_isim, full ISim support;

#                           add [isim] [sim], allow tag lists like [ghdl,isim];

#                           --trace and messages to STDERR;

# 2009-11-20   251   1.8    add isim_prj, first ISim support

# 2008-03-09   124   1.7.3  add in .dep_(ghdl|xst) all dep on vbom dependencies

#                           target now also dependant on .dep_ file

# 2008-03-02   122   1.7.2  add @lib: directive to include UNISIM

# 2007-12-17   102   1.7.1  fix @ucf_cpp logic.

# 2007-12-16   101   1.7    add @ucf_cpp pseudo tag (handle cpp'ed ucf files)

# 2007-11-25    98   1.6.1  drop trailing blanks on input lines

# 2007-11-02    94   1.6    added (xst|ghdl)_export

# 2007-10-26    92   1.5.1  emit '--no-vital-checks' for --ghdl_m for _[sft]sim

# 2007-10-14    98   1.5    handle .exe files under cycwin properly

# 2007-09-15    82   1.4    handle C source objects properly

# 2007-08-10    72   1.3    add [xst], [ghdl] prefix support

# 2007-07-22    68   1.2    add "tag = val"; list files in 'ready to analyse'

#                           order; add --ghdl_a option

# 2007-07-08    65   1.1    add "tag : names"; inferral of _[ft]sim vboms

# 2007-07-06    64   1.0    Initial version

use 5.005;                                  # require Perl 5.005 or higher

use strict;                                 # require strict checking

use FileHandle;

use Getopt::Long;

my %opts = ();

GetOptions(\%opts, "help", "trace", "ise_path=s",

                   "dep_xst", "dep_ghdl", "dep_isim",

                   "xst_prj", "isim_prj",

                   "ghdl_a", "ghdl_a_cmd",

                   "ghdl_i", "ghdl_i_cmd",

                   "ghdl_m", "ghdl_m_cmd",

                   "xst_export=s",

                   "ghdl_export=s",

                   "isim_export=s",

                   "get_top",

                   "flist") || exit 1;

sub print_help;

sub read_vbom;

sub scan_vbom;

sub copy_edir;

sub write_vbomdep;

sub canon_fname;

my @vbom_list;

my @file_list;

my %vbom_tbl;

my %file_tbl;

my %read_tbl;

my %para_tbl;

my @ucf_cpp_list;

my $is_xst  = 0;                            # XST synthesis target

my $is_ghdl = 0;                            # ghdl simulation target

my $is_isim = 0;                            # ISim simulation target

my $is_sim  = 0;                            # simulation target (generic)

my $is_any  = 0;

my $nactions = 0;

my $top_vbom;

my $stem;

my $top;

my $top_done = 0;

my $has_unisim;

my $has_simprim;

my $is_ssim;

my $is_fsim;

my $is_tsim;

my $do_trace = exists $opts{trace};

my $level;

my $xst_writevhdl = 1;

# now using '-ifmt mixed', so language always needed (2011-08-13)

#if (defined $opts{ise_path}) {

#  if ($opts{ise_path} =~ /^xc6s/) {

#    $xst_writevhdl = 0;

#  }

#}

autoflush STDOUT 1;             # autoflush, so noting lost on exec later

if (exists $opts{help}) {

  print_help;

  exit 0;

}

# ensure that one and only one vbom is specified

if (scalar(@ARGV) != 1) {

  print STDERR "%vbomconv-E: only one vbom file name allowed\n\n";

  print_help;

  exit 1;

}

# check that only one action is defined, mark xst, gdhl, or isim class

foreach (keys %opts) {

  $nactions += 1 unless ($_ eq "trace" || $_ eq "ise_path");

  $is_xst  = 1   if ($_ eq "dep_xst");

  $is_ghdl = 1   if ($_ eq "dep_ghdl");

  $is_isim = 1   if ($_ eq "dep_isim");

  $is_xst  = 1   if ($_ =~ /^xst_/);

  $is_ghdl = 1   if ($_ =~ /^ghdl_/);

  $is_isim = 1   if ($_ =~ /^isim_/);

  $is_any  = 1   if ($_ eq "flist");

}

$is_sim = $is_ghdl | $is_isim;

print STDERR "-- [xst] active\n"  if $do_trace && $is_xst;

print STDERR "-- [ghdl] active\n" if $do_trace && $is_ghdl;

print STDERR "-- [isim] active\n" if $do_trace && $is_isim;

print STDERR "-- [sim] active\n"  if $do_trace && $is_sim;

if ($nactions > 1) {

  print STDERR "%vbomconv-E: only one action qualifier allowed\n\n";

  print_help;

  exit 1;

}

$top_vbom = $ARGV[0];

$top_vbom .= ".vbom" unless $top_vbom =~ m{\.vbom$};

$stem = $top_vbom;

$stem =~ s{\..*$}{};

$top = $stem;

$top =~ s{^.*/}{};

# now prepare virtual _fsim and _tsim vbom's

# they are inferred from the _ssim vbom's

if ($top_vbom =~ m{_ssim\.vbom$}) { # detect _ssim

  $is_ssim = 1;

}

if ($top_vbom =~ m{_fsim\.vbom$}) { # map _fsim -> _ssim

  $is_fsim = 1;

  $top_vbom =~ s{_fsim\.vbom$}{_ssim.vbom};

}

if ($top_vbom =~ m{_tsim\.vbom$}) { # map _tsim -> _ssim

  $is_tsim = 1;

  $top_vbom =~ s{_tsim\.vbom$}{_ssim.vbom};

}

# traverse all vbom's start with command line argument

push @vbom_list, $top_vbom;

while (@vbom_list) {

  my $cur_vbom = shift @vbom_list;

  read_vbom($cur_vbom);

}

# traverse internal vbom representation to build file table

scan_vbom($top_vbom);

# sort file table, build file list (decreasing rank)

my @pair_list;

foreach (keys %file_tbl) {

  push @pair_list, [$file_tbl{$_}, $_];

}

@file_list = map {$_->[1]} sort {$b->[0] <=> $a->[0]} @pair_list;

# now generate output and actions, depending on options given

# --trace ------------------------------------------------------------

if ($do_trace) {

  print STDERR "\n";

  print STDERR "filename substitution table:\n";

  foreach (sort keys %para_tbl) {

    print STDERR "  $_ = $para_tbl{$_}\n";

  }

  print STDERR "final file_list:\n";

  foreach (@file_list) {

    print STDERR "  $_\n";

  }

  print STDERR "properties:\n";

  print STDERR "  \@top: $top\n";

}

# --ghdh_a -- ghdl analysis command ----------------------------------

if (exists $opts{ghdl_a} || exists $opts{ghdl_a_cmd}) {

  foreach (@file_list) {

    my $file = $_;

    my $cmd = "ghdl -a";

    $cmd .= ' -P$XILINX/ghdl/unisim'  if $has_unisim;

    $cmd .= ' -P$XILINX/ghdl/simprim' if $has_simprim;

    $cmd .= " --ieee=synopsys";

    $cmd .= " $file";

    print "$cmd\n";

    if (exists $opts{ghdl_a}) {

      my $wrc = system "/bin/sh", "-c", $cmd;

      if ($wrc != 0) {

        my $rc = int($wrc/256);

        if ($rc == 0) {

          my $sig = $wrc % 256;

          print STDERR "%vbomconv-I: compilation aborted by signal $sig\n";

          exit(1);

        } else {

          print STDERR "%vbomconv-I: compilation failed (rc=$rc) $?\n";

          exit($rc);

        }

      }

    }

  }

}

# --ghdh_i -- ghdl inspection command --------------------------------

if (exists $opts{ghdl_i} || exists $opts{ghdl_i_cmd}) {

  my %ghdl_work;

  # read ghdl "work-obj93.cf" file. It has the format

  #   file . "" "" "ghdl -i or -a date>":

  #     entity  at nn( nn) + nn on nn;

  #     architecture  of  at nn( nn) + nn on nn;

  if (-r "work-obj93.cf") {

    open (WFILE, "work-obj93.cf") or

      die "can't open for read work-obj93.cf: $!";

    while () {

      if (m{^file \. \"(.*?)\"}) {

        $ghdl_work{$1} = 1;

      }

    }

    close (WFILE);

  }

  my $cmd = "ghdl -i";

  my $nfile = 0;

  foreach (@file_list) {

    next if /\.c$/;                         # skip C sources, only vhd handled

    if (not exists $ghdl_work{$_}) {

      $cmd .= " \\\n  $_";

      $nfile += 1;

    }

  }

  if ($nfile) {

    print "$cmd\n";

    if (exists $opts{ghdl_i}) {

      exec "/bin/sh", "-c", $cmd;

      die "failed to exec /bin/sh -c $cmd: $!";

    }

  } else {

    print "# $cmd  ## all files already inspected\n";

  }

}

# --ghdh_m -- ghdl make command --------------------------------------

# Note: the 'buildin' make used by the -m option of ghdl does not

#       check for object files linked with -Wl, e.g. vhpi objects.

#       To force a re-elaboration the old executable is deleted first.

#       If used from make with proper dependencies, this will just do

#       the right thing.

if (exists $opts{ghdl_m} || exists $opts{ghdl_m_cmd} ) {

  my $cmd = "";

  if (-r "$stem.exe") {         # check for .exe, in case we are in cygwin

  $cmd .= "rm $stem.exe\n";     # rm old executable to force elaboration

  } elsif  (-r $stem) {         # otherwise

    $cmd .= "rm $stem\n" ;      # rm old executable to force elaboration

  }

  $cmd .= "ghdl -m";

  $cmd .= " -o $stem";

                                    # -fexplicit needed for ISE 13.1,13.3

  $cmd .= ' -fexplicit'             if $has_unisim or $has_simprim;

  $cmd .= ' -P$XILINX/ghdl/unisim'  if $has_unisim;

  $cmd .= ' -P$XILINX/ghdl/simprim' if $has_simprim;

  $cmd .= " --ieee=synopsys";

  $cmd .= " --no-vital-checks"      if $is_ssim or $is_fsim or $is_tsim;

  foreach (@file_list) {

    next unless /\.c$/;         # C source ?

    my $ofile = $_;             # copy to break alias for following s///

    $ofile =~ s{^.*/}{};        # remove directory path

    $ofile =~ s/\.c$/.o/;       # add clause to link C source object file

    $cmd .= " -Wl,$ofile";

  }

  $cmd .= " $top";

  print "$cmd\n";

  if (exists $opts{ghdl_m}) {

    exec "/bin/sh", "-c", $cmd;

    die "failed to exec /bin/sh -c $cmd: $!";

  }

}

# --xst_prj ----------------------------------------------------------

if (exists $opts{xst_prj}) {

  foreach (@file_list) {

    if ($xst_writevhdl) {

      print "vhdl work $_\n";

    } else {

      print "work $_\n";       # for ISE S-6/V-6 compilations with '-ifmt VHDL'

    }

  }

}

# --isim_prj ---------------------------------------------------------

if (exists $opts{isim_prj}) {

  foreach (@file_list) {

    print "vhdl work $_\n";

  }

}

# --dep_xst ----------------------------------------------------------

if (exists $opts{dep_xst}) {

  print "#\n";

  print "$stem.ngc : $stem.dep_xst\n";

  print "#\n";

  foreach (@file_list) {

    print "$stem.ngc : $_\n";

  }

  # handle cpp preprocessed ucf's

  foreach (@ucf_cpp_list) {

    my $file = $_;

    $file =~ s/\.ucf$//;

    print "#\n";

    print "$file.ncd : $file.ucf\n";

    print "include $file.dep_ucf_cpp\n";

  }

  # handle plain ucf's

  if (scalar(@ucf_cpp_list)==0 && -r "$stem.ucf") {

    print "#\n";

    print "$stem.ncd : $stem.ucf\n";

  }

  write_vbomdep("$stem.dep_xst");

}

# --dep_ghdl ---------------------------------------------------------

if (exists $opts{dep_ghdl}) {

  my $stem_fsim = $stem;

  my $stem_tsim = $stem;

  $stem_fsim =~ s/_ssim$/_fsim/;

  $stem_tsim =~ s/_ssim$/_tsim/;

  print "#\n";

  print "$stem : $stem.dep_ghdl\n";

  if ($is_ssim) {

    print "$stem_fsim : $stem.dep_ghdl\n";

    print "$stem_tsim : $stem.dep_ghdl\n";

  }

  print "#\n";

  foreach (@file_list) {

    if (/\.c$/) {

      my $ofile = $_;           # copy to break alias for following s///

      $ofile =~ s{^.*/}{};      # remove directory path

      $ofile =~ s/\.c$/.o/;     # object file name

      print "$stem : $ofile\n"; # depend on C source object file

                                # C source object compilation dependence

      open (ODEPFILE, ">$ofile.dep_ghdl") or

        die "can't write $ofile.dep_ghdl: $!";

      print ODEPFILE "$ofile : $_\n";

      print ODEPFILE "\t\$(COMPILE.c) \$(OUTPUT_OPTION) \$<\n";

      close ODEPFILE;

    } else {

      print "$stem : $_\n";

    }

  }

  if ($is_ssim) {

    foreach (@file_list) {

      my $file = $_;            # copy to break alias for following s///

      if (/\.c$/) {

        $file =~ s{^.*/}{};     # remove directory path

        $file =~ s/\.c$/.o/;    # depend on object file for C sources

      } else {

        $file =~ s/_ssim\.vhd$/_fsim.vhd/;

      }

      print "$stem_fsim : $file\n";

    }

    foreach (@file_list) {

      my $file = $_;            # copy to break alias for following s///

      if (/\.c$/) {

        $file =~ s{^.*/}{};     # remove directory path

        $file =~ s/\.c$/.o/;    # depend on object file for C sources

      } else {

        $file =~ s/_ssim\.vhd$/_tsim.vhd/;

      }

      print "$stem_tsim : $file\n";

    }

  }

  write_vbomdep("$stem.dep_ghdl");

}

# --dep_isim ---------------------------------------------------------

if (exists $opts{dep_isim}) {

  my $stem_isim = $stem . "_ISim";

  $stem_isim =~ s/_ssim_ISim$/_ISim_ssim/ if ($is_ssim);

  my $stem_fsim_isim = $stem_isim;

  my $stem_tsim_isim = $stem_isim;

  $stem_fsim_isim =~ s/_ssim$/_fsim/;

  $stem_tsim_isim =~ s/_ssim$/_tsim/;

  print "#\n";

  print "$stem_isim : $stem.dep_isim\n";

  if ($is_ssim) {

    print "$stem_fsim_isim : $stem.dep_isim\n";

    print "$stem_tsim_isim : $stem.dep_isim\n";

  }

  print "#\n";

  foreach (@file_list) {

    print "$stem_isim : $_\n";

  }

  if ($is_ssim) {

    foreach (@file_list) {

      my $file = $_;            # copy to break alias for following s///

      $file =~ s/_ssim\.vhd$/_fsim.vhd/;

      print "$stem_fsim_isim : $file\n";

    }

    foreach (@file_list) {

      my $file = $_;            # copy to break alias for following s///

      $file =~ s/_ssim\.vhd$/_tsim.vhd/;

      print "$stem_tsim_isim : $file\n";

    }

  }

  write_vbomdep("$stem.dep_isim");

}

# --xst_export or ghdl_export or isim_export -------------------------

if (exists $opts{xst_export}  or

    exists $opts{ghdl_export} or

    exists $opts{isim_export}) {

  my $edir;

  $edir = $opts{xst_export}  if exists $opts{xst_export};

  $edir = $opts{ghdl_export} if exists $opts{ghdl_export};

  $edir = $opts{isim_export} if exists $opts{isim_export};

  if (not -d $edir) {

    print STDERR "%vbomconv-I: create target directory $edir\n";

    system("mkdir -p $edir") == 0 or die "mkdir failed: $?";

  } else {

    print STDERR "%vbomconv-I: target directory $edir already exists\n";

  }

  open(PFILE, ">$edir/$stem.prj") or die "can't write open $edir/$stem.prj: $!";

  foreach (@file_list) {

    my $fname  = $_;

    my $fdpath = ".";

    if (m{(.*)/(.*)}) {

      $fname  = $2;

      $fdpath = $1;

    }

    copy_edir($_, $edir);

    print PFILE "vhdl work $fname\n";

  }

  close(PFILE);

  # Note: currently no xflow opt files exported !!

  if (exists $opts{xst_export}) {

    open(XFILE, ">$edir/$stem.xcf") or

      die "can't write open $edir/$stem.xcf: $!";

    close(XFILE);

    foreach(glob("*.xcf")) { copy_edir($_, $edir); }

    if (-r "$stem.ucf_cpp") {

      system "/bin/sh", "-c", "make $stem.ucf";

    }

    foreach(glob("*.ucf")) { copy_edir($_, $edir); }

  }

}

# --get_top ----------------------------------------------------------

if (exists $opts{get_top}) {

  print "$top\n";

}

# --flist ------------------------------------------------------------

if (exists $opts{flist}) {

  my @flist;

  push @flist, @file_list;

  push @flist, sort keys %read_tbl;

  if (scalar(@ucf_cpp_list)) {

    foreach (@ucf_cpp_list) {

      push @flist, $_."_cpp";

    }

  } else {

    if (-r "$stem.ucf") {

      push @flist, "$stem.ucf";

    }

  }

  foreach (sort @flist) {

    my $fname  = $_;

    my $fdpath = ".";

    if (m{(.*)/(.*)}) {

      $fname  = $2;

      $fdpath = $1;

    }

    print "$fdpath/$fname\n";

  }

}

#-------------------------------------------------------------------------------

sub read_vbom {

  my ($vbom) = @_;

  print STDERR "-- open $vbom\n" if $do_trace;

  open (IFILE, $vbom)    or die "can't open for read $vbom: $!";

  my $vbom_path = "";

  my $vbom_file = $vbom;

  if ($vbom =~ m{^(.*)/([a-zA-Z0-9_.]*)$}) {

    $vbom_path = $1;

    $vbom_file = $2;

  }

  $read_tbl{$vbom} += 1;                    # mark this vbom already read

  while () {

    chomp;

    next if /^\s*#/;                        # drop comments

    next if /^\s*$/;                        # drop empty lines

    s/\s*$//;                               # drop trailing blanks

    # process parameter definitions

    if (m{([\w]+)\s*=\s*(.*)}) {

      my $para = $1;

      my $val  = $2;

      if ($val eq "") {

        print STDERR "%vbomconv-E: invalid \'$_\' in $vbom_file\n";

        exit 1;

      }

      if (not exists $para_tbl{$para}) {

        $para_tbl{$para} = canon_fname($vbom_path, $val);

        print STDERR "--- define \${$para} = $val\n" if $do_trace;

      } else {

        print STDERR "--- ignore \${$para} = $val\n" if $do_trace;

      }

      next;

    }

    # process parameter substitutions

    while (m{\$\{([\w]+)\s*(:=)?\s*(.*?)\}}) {

      my $para = $1;

      my $del  = $2;

      my $val  = $3;

      my $pre  = $`;

      my $post = $';

      if (defined $del && $del eq ":=") {

        if (not exists $para_tbl{$para}) {

          $para_tbl{$para} = canon_fname($vbom_path, $val);

          print STDERR "--- define \${$para := $val}\n" if $do_trace;

        } else {

          print STDERR "--- ignore \${$para := $val}\n" if $do_trace;

        }

      }

      if (defined $para_tbl{$para}) {

        if ($do_trace) {

          print STDERR "--- use    \${$para} -> $para_tbl{$para}\n";

        } else {

          ## print STDERR "%vbomconv-I: \${$para} -> $para_tbl{$para}\n";

        }

        $_ = $pre . "!" . $para_tbl{$para} . $post;

      } else {

        print STDERR "%vbomconv-E: undefined \${$para} in $vbom_file\n";

        exit 1;

      }

    }

    if (/^\[([a-z,]+)\]\s*(.+)$/) {         # [xxx,yyy] tag seen

      my $qual = $1;

      my $name = $2;

      my $keep = $is_any;

      ## print STDERR "+++1 |$qual|$name|$vbom|\n";

      foreach my $pref (split /,/,$qual) {

        if ($pref =~ /^(xst|ghdl|isim|sim)$/) {

          $keep = 1 if ($pref eq "xst"  && $is_xst);

          $keep = 1 if ($pref eq "ghdl" && $is_ghdl);

          $keep = 1 if ($pref eq "isim" && $is_isim);

          $keep = 1 if ($pref eq "sim"  && $is_sim);

        } else {

          print STDERR "%vbomconv-W: unknown tag [$pref] in $vbom_file\n";

        }

      }

      if (not $keep) {

        print STDERR "--- drop \"$_\"\n" if $do_trace;

        next;

      }

      $_ = $name;                           # remove [xxx] tag

    }

    my $tag;

    my $val = $_;

    # detect tag:val lines

    if (m{^\s*(.*?)\s*:\s*(.*?)\s*$}) {

      $tag = $1;

      $val = $2;

      # process @top: lines

      if ($tag eq '@top') {

        $top = $val unless $top_done;

      # process @ucf_cpp: lines

      } elsif ($tag eq '@ucf_cpp') {

        push @ucf_cpp_list, $val;

      # process @lib: lines

      } elsif ($tag eq '@lib') {

        if ($val eq 'unisim') {

          $has_unisim = 1;

        } elsif ($val eq 'simprim') {

          $has_simprim = 1;

        } else {

          print STDERR "%vbomconv-E: invalid lib type \'$tag\' in $vbom_file\n";

          exit 1;

        }

      } else {

        print STDERR "%vbomconv-E: invalid \'$tag:\' line in $vbom_file\n";

        exit 1;

      }

      next;

    }

    # now do _fsim, _tsim mapping

    $val =~ s{_ssim\.vhd$}{_fsim.vhd} if $is_fsim;

    $val =~ s{_ssim\.vhd$}{_tsim.vhd} if $is_tsim;

    # process normal .vhd or .vbom file lines

    # canonize file name unless not already done by filename substitution

    my $fullname;

    if ($val =~ m{^!(.*)$}) {

      $fullname = $1;

    } else {

      $fullname = canon_fname($vbom_path, $val);

    }

    # determine whether additional libs needed

    if ($fullname =~ m{_ssim\.vhd$}) {      # ends in _ssim.vhd

      $has_unisim = 1;

    }

    if ($fullname =~ m{_[ft]sim\.vhd$}) {   # ends in _fsim.vhd or _tsim.vhd

      $has_simprim = 1;

    }

    # build vbom table

    push @{$vbom_tbl{$vbom}}, $fullname;

    print STDERR "--- add $fullname\n" if $do_trace;

    # if a vbom, queue if not not already read

    if ($fullname =~ m{\.vbom$} && not exists $read_tbl{$fullname} ) {

       push @vbom_list, $fullname;

       print STDERR "--- queue $fullname\n" if $do_trace;

    }

  }

  $top_done = 1;

  close (IFILE);

}

#-------------------------------------------------------------------------------

sub scan_vbom {

  my ($vbom) = @_;

  $level += 1;

  my $rank = 1000*$level + scalar(@{$vbom_tbl{$vbom}});

  print STDERR "--> $level: $vbom\n" if $do_trace;

  die "%vbomcov-E excessive vbom stack depth \n" if $level>=1000;

  foreach (@{$vbom_tbl{$vbom}}) {

    my $file = $_;

    $rank -= 1;

    if (m{\.vbom$}) {

      scan_vbom($file);

    } else {

      if (exists $file_tbl{$file}) {

        if ($rank > $file_tbl{$file}) {

          print STDERR "    $file   $file_tbl{$file} -> $rank\n" if $do_trace;

          $file_tbl{$file} = $rank;

        } else {

          print STDERR "    $file   $file_tbl{$file} (keep)\n" if $do_trace;

        }

      } else {

         $file_tbl{$file} = $rank;

         print STDERR "    $file   $file_tbl{$file} (new)\n" if $do_trace;

      }

    }

  }

  print STDERR "<-- $level: $vbom\n" if $do_trace;

  $level -= 1;

}

#-------------------------------------------------------------------------------

sub copy_edir {

  my ($file, $edir) = @_;

  print "cp -p $file $edir\n";

  system("cp -p $file $edir")==0 or die "cp -p failed: $?";

}

#-------------------------------------------------------------------------------

sub write_vbomdep {

  my ($target) = @_;

  print "#\n";

  print "# .dep_ on .vbom dependencies\n";

  print "#\n";

  foreach (sort keys %read_tbl) {

    print "$target : $_\n";

  }

}

#-------------------------------------------------------------------------------

sub canon_fname {

  my ($vpath,$fname) = @_;

    # get full relative file name (relative to cwd)

    $fname = "$vpath/$fname" if $vpath ne "";

    # remove 'inner' .., e.g.  ../x/../y -->  ../y

    # this will also canonize the file names, thus same file same name

    my @flist;

    foreach (split "/",$fname) {

      if (scalar(@flist) && $flist[$#flist] ne ".." && $_ eq "..") {

        pop @flist;

      } else {

        push @flist, $_;

      }

    }

    return join "/", @flist;

}

#-------------------------------------------------------------------------------

sub print_help {

  print "usage: vbomconf  file.vbom\n";

  print "  --help           this message\n";

  print "  --trace          trace recursive processing of vbom's\n";

  print "  --dep_xst        generate xst dependencies for make (on stdout)\n";

  print "  --dep_ghdl       generate ghdl dependencies for make (on stdout)\n";

  print "  --dep_isim       generate isim dependencies for make (on stdout)\n";

  print "  --xst_prj        generate xst project file (on stdout)\n";

  print "  --isim_prj       generate isim project file (on stdout)\n";

  print "  --ghdl_a         generate and execute ghdl -a  (analyse)\n";

  print "  --ghdl_a_cmd     like ghdl_a, but only print command, no exec\n";

  print "  --ghdl_i         generate and execute ghdl -i  (inspect)\n";

  print "  --ghdl_i_cmd     like ghdl_i, but only print command, no exec\n";

  print "  --ghdl_m         generate and execute ghdl -m  (make)\n";

  print "  --ghdl_m_cmd     like ghdl_m, but only print command, no exec\n";

  print "  --xst_export=s   export all xst source files into directory s\n";

  print "  --ghdl_export=s  export all ghdl source files into directory s\n";

  print "  --isim_export=s  export all isim source files into directory s\n";

  print "  --flist          list all files touched by vbom for all tags\n";

}