scripts/get_abi.pl

   1 #!/usr/bin/env perl
   2 # SPDX-License-Identifier: GPL-2.0
   3
   4 use strict;
   5 use warnings;
   6 use utf8;
   7 use Pod::Usage;
   8 use Getopt::Long;
   9 use File::Find;
  10 use Fcntl ':mode';
  11
  12 my $help = 0;
  13 my $man = 0;
  14 my $debug = 0;
  15 my $enable_lineno = 0;
  16 my $prefix="Documentation/ABI";
  17
  18 #
  19 # If true, assumes that the description is formatted with ReST
  20 #
  21 my $description_is_rst = 1;
  22
  23 GetOptions(
  24         "debug|d+" => \$debug,
  25         "enable-lineno" => \$enable_lineno,
  26         "rst-source!" => \$description_is_rst,
  27         "dir=s" => \$prefix,
  28         'help|?' => \$help,
  29         man => \$man
  30 ) or pod2usage(2);
  31
  32 pod2usage(1) if $help;
  33 pod2usage(-exitstatus => 0, -verbose => 2) if $man;
  34
  35 pod2usage(2) if (scalar @ARGV < 1 || @ARGV > 2);
  36
  37 my ($cmd, $arg) = @ARGV;
  38
  39 pod2usage(2) if ($cmd ne "search" && $cmd ne "rest" && $cmd ne "validate");
  40 pod2usage(2) if ($cmd eq "search" && !$arg);
  41
  42 require Data::Dumper if ($debug);
  43
  44 my %data;
  45 my %symbols;
  46
  47 #
  48 # Displays an error message, printing file name and line
  49 #
  50 sub parse_error($$$$) {
  51         my ($file, $ln, $msg, $data) = @_;
  52
  53         $data =~ s/\s+$/\n/;
  54
  55         print STDERR "Warning: file $file#$ln:\n\t$msg";
  56
  57         if ($data ne "") {
  58                 print STDERR ". Line\n\t\t$data";
  59         } else {
  60             print STDERR "\n";
  61         }
  62 }
  63
  64 #
  65 # Parse an ABI file, storing its contents at %data
  66 #
  67 sub parse_abi {
  68         my $file = $File::Find::name;
  69
  70         my $mode = (stat($file))[2];
  71         return if ($mode & S_IFDIR);
  72         return if ($file =~ m,/README,);
  73
  74         my $name = $file;
  75         $name =~ s,.*/,,;
  76
  77         my $fn = $file;
  78         $fn =~ s,Documentation/ABI/,,;
  79
  80         my $nametag = "File $fn";
  81         $data{$nametag}->{what} = "File $name";
  82         $data{$nametag}->{type} = "File";
  83         $data{$nametag}->{file} = $name;
  84         $data{$nametag}->{filepath} = $file;
  85         $data{$nametag}->{is_file} = 1;
  86         $data{$nametag}->{line_no} = 1;
  87
  88         my $type = $file;
  89         $type =~ s,.*/(.*)/.*,$1,;
  90
  91         my $what;
  92         my $new_what;
  93         my $tag = "";
  94         my $ln;
  95         my $xrefs;
  96         my $space;
  97         my @labels;
  98         my $label = "";
  99
 100         print STDERR "Opening $file\n" if ($debug > 1);
 101         open IN, $file;
 102         while(<IN>) {
 103                 $ln++;
 104                 if (m/^(\S+)(:\s*)(.*)/i) {
 105                         my $new_tag = lc($1);
 106                         my $sep = $2;
 107                         my $content = $3;
 108
 109                         if (!($new_tag =~ m/(what|where|date|kernelversion|contact|description|users)/)) {
 110                                 if ($tag eq "description") {
 111                                         # New "tag" is actually part of
 112                                         # description. Don't consider it a tag
 113                                         $new_tag = "";
 114                                 } elsif ($tag ne "") {
 115                                         parse_error($file, $ln, "tag '$tag' is invalid", $_);
 116                                 }
 117                         }
 118
 119                         # Invalid, but it is a common mistake
 120                         if ($new_tag eq "where") {
 121                                 parse_error($file, $ln, "tag 'Where' is invalid. Should be 'What:' instead", "");
 122                                 $new_tag = "what";
 123                         }
 124
 125                         if ($new_tag =~ m/what/) {
 126                                 $space = "";
 127                                 $content =~ s/[,.;]$//;
 128
 129                                 push @{$symbols{$content}->{file}}, " $file:" . ($ln - 1);
 130
 131                                 if ($tag =~ m/what/) {
 132                                         $what .= ", " . $content;
 133                                 } else {
 134                                         if ($what) {
 135                                                 parse_error($file, $ln, "What '$what' doesn't have a description", "") if (!$data{$what}->{description});
 136
 137                                                 foreach my $w(split /, /, $what) {
 138                                                         $symbols{$w}->{xref} = $what;
 139                                                 };
 140                                         }
 141
 142                                         $what = $content;
 143                                         $label = $content;
 144                                         $new_what = 1;
 145                                 }
 146                                 push @labels, [($content, $label)];
 147                                 $tag = $new_tag;
 148
 149                                 push @{$data{$nametag}->{symbols}}, $content if ($data{$nametag}->{what});
 150                                 next;
 151                         }
 152
 153                         if ($tag ne "" && $new_tag) {
 154                                 $tag = $new_tag;
 155
 156                                 if ($new_what) {
 157                                         @{$data{$what}->{label_list}} = @labels if ($data{$nametag}->{what});
 158                                         @labels = ();
 159                                         $label = "";
 160                                         $new_what = 0;
 161
 162                                         $data{$what}->{type} = $type;
 163                                         if (!defined($data{$what}->{file})) {
 164                                                 $data{$what}->{file} = $name;
 165                                                 $data{$what}->{filepath} = $file;
 166                                         } else {
 167                                                 if ($name ne $data{$what}->{file}) {
 168                                                         $data{$what}->{file} .= " " . $name;
 169                                                         $data{$what}->{filepath} .= " " . $file;
 170                                                 }
 171                                         }
 172                                         print STDERR "\twhat: $what\n" if ($debug > 1);
 173                                         $data{$what}->{line_no} = $ln;
 174                                 } else {
 175                                         $data{$what}->{line_no} = $ln if (!defined($data{$what}->{line_no}));
 176                                 }
 177
 178                                 if (!$what) {
 179                                         parse_error($file, $ln, "'What:' should come first:", $_);
 180                                         next;
 181                                 }
 182                                 if ($new_tag eq "description") {
 183                                         $sep =~ s,:, ,;
 184                                         $content = ' ' x length($new_tag) . $sep . $content;
 185                                         while ($content =~ s/\t+/' ' x (length($&) * 8 - length($`) % 8)/e) {}
 186                                         if ($content =~ m/^(\s*)(\S.*)$/) {
 187                                                 # Preserve initial spaces for the first line
 188                                                 $space = $1;
 189                                                 $content = "$2\n";
 190                                                 $data{$what}->{$tag} .= $content;
 191                                         } else {
 192                                                 undef($space);
 193                                         }
 194
 195                                 } else {
 196                                         $data{$what}->{$tag} = $content;
 197                                 }
 198                                 next;
 199                         }
 200                 }
 201
 202                 # Store any contents before tags at the database
 203                 if (!$tag && $data{$nametag}->{what}) {
 204                         $data{$nametag}->{description} .= $_;
 205                         next;
 206                 }
 207
 208                 if ($tag eq "description") {
 209                         my $content = $_;
 210                         while ($content =~ s/\t+/' ' x (length($&) * 8 - length($`) % 8)/e) {}
 211                         if (m/^\s*\n/) {
 212                                 $data{$what}->{$tag} .= "\n";
 213                                 next;
 214                         }
 215
 216                         if (!defined($space)) {
 217                                 # Preserve initial spaces for the first line
 218                                 if ($content =~ m/^(\s*)(\S.*)$/) {
 219                                         $space = $1;
 220                                         $content = "$2\n";
 221                                 }
 222                         } else {
 223                                 $space = "" if (!($content =~ s/^($space)//));
 224                         }
 225                         $data{$what}->{$tag} .= $content;
 226
 227                         next;
 228                 }
 229                 if (m/^\s*(.*)/) {
 230                         $data{$what}->{$tag} .= "\n$1";
 231                         $data{$what}->{$tag} =~ s/\n+$//;
 232                         next;
 233                 }
 234
 235                 # Everything else is error
 236                 parse_error($file, $ln, "Unexpected content", $_);
 237         }
 238         $data{$nametag}->{description} =~ s/^\n+// if ($data{$nametag}->{description});
 239         if ($what) {
 240                 parse_error($file, $ln, "What '$what' doesn't have a description", "") if (!$data{$what}->{description});
 241
 242                 foreach my $w(split /, /,$what) {
 243                         $symbols{$w}->{xref} = $what;
 244                 };
 245         }
 246         close IN;
 247 }
 248
 249 sub create_labels {
 250         my %labels;
 251
 252         foreach my $what (keys %data) {
 253                 next if ($data{$what}->{file} eq "File");
 254
 255                 foreach my $p (@{$data{$what}->{label_list}}) {
 256                         my ($content, $label) = @{$p};
 257                         $label = "abi_" . $label . " ";
 258                         $label =~ tr/A-Z/a-z/;
 259
 260                         # Convert special chars to "_"
 261                         $label =~s/([\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\xff])/_/g;
 262                         $label =~ s,_+,_,g;
 263                         $label =~ s,_$,,;
 264
 265                         # Avoid duplicated labels
 266                         while (defined($labels{$label})) {
 267                             my @chars = ("A".."Z", "a".."z");
 268                             $label .= $chars[rand @chars];
 269                         }
 270                         $labels{$label} = 1;
 271
 272                         $data{$what}->{label} = $label;
 273
 274                         # only one label is enough
 275                         last;
 276                 }
 277         }
 278 }
 279
 280 #
 281 # Outputs the book on ReST format
 282 #
 283
 284 # \b doesn't work well with paths. So, we need to define something else:
 285 # Boundaries are punct characters, spaces and end-of-line
 286 my $start = qr {(^|\s|\() }x;
 287 my $bondary = qr { ([,.:;\)\s]|\z) }x;
 288 my $xref_match = qr { $start(\/(sys|config|proc|dev|kvd)\/[^,.:;\)\s]+)$bondary }x;
 289 my $symbols = qr { ([\x01-\x08\x0e-\x1f\x21-\x2f\x3a-\x40\x7b-\xff]) }x;
 290
 291 sub output_rest {
 292         create_labels();
 293
 294         my $part = "";
 295
 296         foreach my $what (sort {
 297                                 ($data{$a}->{type} eq "File") cmp ($data{$b}->{type} eq "File") ||
 298                                 $a cmp $b
 299                                } keys %data) {
 300                 my $type = $data{$what}->{type};
 301
 302                 my @file = split / /, $data{$what}->{file};
 303                 my @filepath = split / /, $data{$what}->{filepath};
 304
 305                 if ($enable_lineno) {
 306                         printf "#define LINENO %s%s#%s\n\n",
 307                                $prefix, $file[0],
 308                                $data{$what}->{line_no};
 309                 }
 310
 311                 my $w = $what;
 312
 313                 if ($type ne "File") {
 314                         my $cur_part = $what;
 315                         if ($what =~ '/') {
 316                                 if ($what =~ m#^(\/?(?:[\w\-]+\/?){1,2})#) {
 317                                         $cur_part = "Symbols under $1";
 318                                         $cur_part =~ s,/$,,;
 319                                 }
 320                         }
 321
 322                         if ($cur_part ne "" && $part ne $cur_part) {
 323                             $part = $cur_part;
 324                             my $bar = $part;
 325                             $bar =~ s/./-/g;
 326                             print "$part\n$bar\n\n";
 327                         }
 328
 329                         printf ".. _%s:\n\n", $data{$what}->{label};
 330
 331                         my @names = split /, /,$w;
 332                         my $len = 0;
 333
 334                         foreach my $name (@names) {
 335                                 $name =~ s/$symbols/\\$1/g;
 336                                 $name = "**$name**";
 337                                 $len = length($name) if (length($name) > $len);
 338                         }
 339
 340                         print "+-" . "-" x $len . "-+\n";
 341                         foreach my $name (@names) {
 342                                 printf "| %s", $name . " " x ($len - length($name)) . " |\n";
 343                                 print "+-" . "-" x $len . "-+\n";
 344                         }
 345
 346                         print "\n";
 347                 }
 348
 349                 for (my $i = 0; $i < scalar(@filepath); $i++) {
 350                         my $path = $filepath[$i];
 351                         my $f = $file[$i];
 352
 353                         $path =~ s,.*/(.*/.*),$1,;;
 354                         $path =~ s,[/\-],_,g;;
 355                         my $fileref = "abi_file_".$path;
 356
 357                         if ($type eq "File") {
 358                                 print ".. _$fileref:\n\n";
 359                         } else {
 360                                 print "Defined on file :ref:`$f <$fileref>`\n\n";
 361                         }
 362                 }
 363
 364                 if ($type eq "File") {
 365                         my $bar = $w;
 366                         $bar =~ s/./-/g;
 367                         print "$w\n$bar\n\n";
 368                 }
 369
 370                 my $desc = "";
 371                 $desc = $data{$what}->{description} if (defined($data{$what}->{description}));
 372                 $desc =~ s/\s+$/\n/;
 373
 374                 if (!($desc =~ /^\s*$/)) {
 375                         if ($description_is_rst) {
 376                                 # Remove title markups from the description
 377                                 # Having titles inside ABI files will only work if extra
 378                                 # care would be taken in order to strictly follow the same
 379                                 # level order for each markup.
 380                                 $desc =~ s/\n[\-\*\=\^\~]+\n/\n\n/g;
 381
 382                                 # Enrich text by creating cross-references
 383
 384                                 my $new_desc = "";
 385                                 my $init_indent = -1;
 386                                 my $literal_indent = -1;
 387
 388                                 open(my $fh, "+<", \$desc);
 389                                 while (my $d = <$fh>) {
 390                                         my $indent = $d =~ m/^(\s+)/;
 391                                         my $spaces = length($indent);
 392                                         $init_indent = $indent if ($init_indent < 0);
 393                                         if ($literal_indent >= 0) {
 394                                                 if ($spaces > $literal_indent) {
 395                                                         $new_desc .= $d;
 396                                                         next;
 397                                                 } else {
 398                                                         $literal_indent = -1;
 399                                                 }
 400                                         } else {
 401                                                 if ($d =~ /()::$/ && !($d =~ /^\s*\.\./)) {
 402                                                         $literal_indent = $spaces;
 403                                                 }
 404                                         }
 405
 406                                         $d =~ s,Documentation/(?!devicetree)(\S+)\.rst,:doc:`/$1`,g;
 407
 408                                         my @matches = $d =~ m,Documentation/ABI/([\w\/\-]+),g;
 409                                         foreach my $f (@matches) {
 410                                                 my $xref = $f;
 411                                                 my $path = $f;
 412                                                 $path =~ s,.*/(.*/.*),$1,;;
 413                                                 $path =~ s,[/\-],_,g;;
 414                                                 $xref .= " <abi_file_" . $path . ">";
 415                                                 $d =~ s,\bDocumentation/ABI/$f\b,:ref:`$xref`,g;
 416                                         }
 417
 418                                         # Seek for cross reference symbols like /sys/...
 419                                         @matches = $d =~ m/$xref_match/g;
 420
 421                                         foreach my $s (@matches) {
 422                                                 next if (!($s =~ m,/,));
 423                                                 if (defined($data{$s}) && defined($data{$s}->{label})) {
 424                                                         my $xref = $s;
 425
 426                                                         $xref =~ s/$symbols/\\$1/g;
 427                                                         $xref = ":ref:`$xref <" . $data{$s}->{label} . ">`";
 428
 429                                                         $d =~ s,$start$s$bondary,$1$xref$2,g;
 430                                                 }
 431                                         }
 432                                         $new_desc .= $d;
 433                                 }
 434                                 close $fh;
 435
 436
 437                                 print "$new_desc\n\n";
 438                         } else {
 439                                 $desc =~ s/^\s+//;
 440
 441                                 # Remove title markups from the description, as they won't work
 442                                 $desc =~ s/\n[\-\*\=\^\~]+\n/\n\n/g;
 443
 444                                 if ($desc =~ m/\:\n/ || $desc =~ m/\n[\t ]+/  || $desc =~ m/[\x00-\x08\x0b-\x1f\x7b-\xff]/) {
 445                                         # put everything inside a code block
 446                                         $desc =~ s/\n/\n /g;
 447
 448                                         print "::\n\n";
 449                                         print " $desc\n\n";
 450                                 } else {
 451                                         # Escape any special chars from description
 452                                         $desc =~s/([\x00-\x08\x0b-\x1f\x21-\x2a\x2d\x2f\x3c-\x40\x5c\x5e-\x60\x7b-\xff])/\\$1/g;
 453                                         print "$desc\n\n";
 454                                 }
 455                         }
 456                 } else {
 457                         print "DESCRIPTION MISSING for $what\n\n" if (!$data{$what}->{is_file});
 458                 }
 459
 460                 if ($data{$what}->{symbols}) {
 461                         printf "Has the following ABI:\n\n";
 462
 463                         foreach my $content(@{$data{$what}->{symbols}}) {
 464                                 my $label = $data{$symbols{$content}->{xref}}->{label};
 465
 466                                 # Escape special chars from content
 467                                 $content =~s/([\x00-\x1f\x21-\x2f\x3a-\x40\x7b-\xff])/\\$1/g;
 468
 469                                 print "- :ref:`$content <$label>`\n\n";
 470                         }
 471                 }
 472
 473                 if (defined($data{$what}->{users})) {
 474                         my $users = $data{$what}->{users};
 475
 476                         $users =~ s/\n/\n\t/g;
 477                         printf "Users:\n\t%s\n\n", $users if ($users ne "");
 478                 }
 479
 480         }
 481 }
 482
 483 #
 484 # Searches for ABI symbols
 485 #
 486 sub search_symbols {
 487         foreach my $what (sort keys %data) {
 488                 next if (!($what =~ m/($arg)/));
 489
 490                 my $type = $data{$what}->{type};
 491                 next if ($type eq "File");
 492
 493                 my $file = $data{$what}->{filepath};
 494
 495                 my $bar = $what;
 496                 $bar =~ s/./-/g;
 497
 498                 print "\n$what\n$bar\n\n";
 499
 500                 my $kernelversion = $data{$what}->{kernelversion} if (defined($data{$what}->{kernelversion}));
 501                 my $contact = $data{$what}->{contact} if (defined($data{$what}->{contact}));
 502                 my $users = $data{$what}->{users} if (defined($data{$what}->{users}));
 503                 my $date = $data{$what}->{date} if (defined($data{$what}->{date}));
 504                 my $desc = $data{$what}->{description} if (defined($data{$what}->{description}));
 505
 506                 $kernelversion =~ s/^\s+// if ($kernelversion);
 507                 $contact =~ s/^\s+// if ($contact);
 508                 if ($users) {
 509                         $users =~ s/^\s+//;
 510                         $users =~ s/\n//g;
 511                 }
 512                 $date =~ s/^\s+// if ($date);
 513                 $desc =~ s/^\s+// if ($desc);
 514
 515                 printf "Kernel version:\t\t%s\n", $kernelversion if ($kernelversion);
 516                 printf "Date:\t\t\t%s\n", $date if ($date);
 517                 printf "Contact:\t\t%s\n", $contact if ($contact);
 518                 printf "Users:\t\t\t%s\n", $users if ($users);
 519                 print "Defined on file(s):\t$file\n\n";
 520                 print "Description:\n\n$desc";
 521         }
 522 }
 523
 524 # Ensure that the prefix will always end with a slash
 525 # While this is not needed for find, it makes the patch nicer
 526 # with --enable-lineno
 527 $prefix =~ s,/?$,/,;
 528
 529 #
 530 # Parses all ABI files located at $prefix dir
 531 #
 532 find({wanted =>\&parse_abi, no_chdir => 1}, $prefix);
 533
 534 print STDERR Data::Dumper->Dump([\%data], [qw(*data)]) if ($debug);
 535
 536 #
 537 # Handles the command
 538 #
 539 if ($cmd eq "search") {
 540         search_symbols;
 541 } else {
 542         if ($cmd eq "rest") {
 543                 output_rest;
 544         }
 545
 546         # Warn about duplicated ABI entries
 547         foreach my $what(sort keys %symbols) {
 548                 my @files = @{$symbols{$what}->{file}};
 549
 550                 next if (scalar(@files) == 1);
 551
 552                 printf STDERR "Warning: $what is defined %d times: @files\n",
 553                     scalar(@files);
 554         }
 555 }
 556
 557 __END__
 558
 559 =head1 NAME
 560
 561 abi_book.pl - parse the Linux ABI files and produce a ReST book.
 562
 563 =head1 SYNOPSIS
 564
 565 B<abi_book.pl> [--debug] [--enable-lineno] [--man] [--help]
 566                [--(no-)rst-source] [--dir=<dir>] <COMAND> [<ARGUMENT>]
 567
 568 Where <COMMAND> can be:
 569
 570 =over 8
 571
 572 B<search> [SEARCH_REGEX] - search for [SEARCH_REGEX] inside ABI
 573
 574 B<rest>                  - output the ABI in ReST markup language
 575
 576 B<validate>              - validate the ABI contents
 577
 578 =back
 579
 580 =head1 OPTIONS
 581
 582 =over 8
 583
 584 =item B<--dir>
 585
 586 Changes the location of the ABI search. By default, it uses
 587 the Documentation/ABI directory.
 588
 589 =item B<--rst-source> and B<--no-rst-source>
 590
 591 The input file may be using ReST syntax or not. Those two options allow
 592 selecting between a rst-compliant source ABI (--rst-source), or a
 593 plain text that may be violating ReST spec, so it requres some escaping
 594 logic (--no-rst-source).
 595
 596 =item B<--enable-lineno>
 597
 598 Enable output of #define LINENO lines.
 599
 600 =item B<--debug>
 601
 602 Put the script in verbose mode, useful for debugging. Can be called multiple
 603 times, to increase verbosity.
 604
 605 =item B<--help>
 606
 607 Prints a brief help message and exits.
 608
 609 =item B<--man>
 610
 611 Prints the manual page and exits.
 612
 613 =back
 614
 615 =head1 DESCRIPTION
 616
 617 Parse the Linux ABI files from ABI DIR (usually located at Documentation/ABI),
 618 allowing to search for ABI symbols or to produce a ReST book containing
 619 the Linux ABI documentation.
 620
 621 =head1 EXAMPLES
 622
 623 Search for all stable symbols with the word "usb":
 624
 625 =over 8
 626
 627 $ scripts/get_abi.pl search usb --dir Documentation/ABI/stable
 628
 629 =back
 630
 631 Search for all symbols that match the regex expression "usb.*cap":
 632
 633 =over 8
 634
 635 $ scripts/get_abi.pl search usb.*cap
 636
 637 =back
 638
 639 Output all obsoleted symbols in ReST format
 640
 641 =over 8
 642
 643 $ scripts/get_abi.pl rest --dir Documentation/ABI/obsolete
 644
 645 =back
 646
 647 =head1 BUGS
 648
 649 Report bugs to Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
 650
 651 =head1 COPYRIGHT
 652
 653 Copyright (c) 2016-2019 by Mauro Carvalho Chehab <mchehab+samsung@kernel.org>.
 654
 655 License GPLv2: GNU GPL version 2 <http://gnu.org/licenses/gpl.html>.
 656
 657 This is free software: you are free to change and redistribute it.
 658 There is NO WARRANTY, to the extent permitted by law.
 659
 660 =cut