DBUG_ENTER/RETURN tags added

#!/usr/bin/perl

die "No files specified\n" unless $ARGV[0];

$ctags="exctags -x -f - --c-types=f -u";

sub get_tag {

  local $_=<TAGS>;

  ($symbol, $line)= /^(.*\S)\s+function\s+(\d+)/;

  $symbol=$1 if /\s(\S+)\s*\(/;

  $line=1e50 unless $line;

}

while($src=shift)

{

  warn "==> $src\n";

  $dst=$src.$$;

  open(TAGS, "$ctags $src|") || die "Cannot exec('$ctags $src'): $!";

  open(SRC, "<$src") || die "Cannot open $src: $!";

  open(DST, ">$dst") || die "Cannot create $dst: $!";

  select DST;

  &get_tag;

  $in_func=0;

  while(<SRC>)

  {

    my $orig=$_;

    if ($in_func)

    {

      if (/\breturn\b/ && !/\/\*.*\breturn\b.*\*\// && !/;/ )

      {

        $_.=<SRC> until /;/;

      }

      s/(?<=\s)return\s*;/DBUG_VOID_RETURN;/;

      s/(?<=\s)return\s*(.+)\s*;/DBUG_RETURN(\1);/s;

      $ret_line=$. if /DBUG_(VOID_)?RETURN/; #{{

      print "$tab  DBUG_VOID_RETURN;\n" if /^$tab}/ && $ret_line < $.-1;

      $in_func=0 if /^$tab}/;

      warn "$src:".($.-1)."\t$orig" if /\breturn\b/;

    }

    print;

    next if /DBUG_ENTER/;

    next if $. < $line;

    die "Something wrong: \$.=$., \$line=$line, \$symbol=$symbol\n" if $. > $line;

    &get_tag && next if /^\s*inline /;

    print $_=<SRC> until /{/; $tab=$`;

    &get_tag && next if /}/; # skip one-liners

    $semicolon=1;

    while(<SRC>)

    {

      $skip=!$semicolon;

      $semicolon= /;\s*$/;

      print && next if $skip ||

        (/^\s+\w+((::\w+)?|<\w+>)\s+\**\w+/ && !/^\s*return/);

      last if /DBUG_ENTER/;

      print "$tab  DBUG_ENTER(\"$symbol\");\n";

      print "\n" unless $_ eq "\n";

      last;

    }

    $in_func=1;

    &get_tag;

    redo;

  }

  close SRC;

  close DST;

  close TAGS;

  unlink("$src.orig");

  rename($src, "$src.orig") || die "Cannot rename $src to $src.orig: $!";

  rename($dst, $src) || die "Cannot rename $dst to $src: $!";

}

warn "All done!\n";