scripts/get_abi.pl

   1 #!/usr/bin/env perl
   2 # SPDX-License-Identifier: GPL-2.0
   3
   4 BEGIN { $Pod::Usage::Formatter = 'Pod::Text::Termcap'; }
   5
   6 use strict;
   7 use warnings;
   8 use utf8;
   9 use Pod::Usage qw(pod2usage);
  10 use Getopt::Long;
  11 use File::Find;
  12 use IO::Handle;
  13 use Fcntl ':mode';
  14 use Cwd 'abs_path';
  15 use Data::Dumper;
  16
  17 my $help = 0;
  18 my $hint = 0;
  19 my $man = 0;
  20 my $debug = 0;
  21 my $enable_lineno = 0;
  22 my $show_warnings = 1;
  23 my $prefix="Documentation/ABI";
  24 my $sysfs_prefix="/sys";
  25 my $search_string;
  26
  27 # Debug options
  28 my $dbg_what_parsing = 1;
  29 my $dbg_what_open = 2;
  30 my $dbg_dump_abi_structs = 4;
  31 my $dbg_undefined = 8;
  32
  33 $Data::Dumper::Indent = 1;
  34 $Data::Dumper::Terse = 1;
  35
  36 #
  37 # If true, assumes that the description is formatted with ReST
  38 #
  39 my $description_is_rst = 1;
  40
  41 GetOptions(
  42         "debug=i" => \$debug,
  43         "enable-lineno" => \$enable_lineno,
  44         "rst-source!" => \$description_is_rst,
  45         "dir=s" => \$prefix,
  46         'help|?' => \$help,
  47         "show-hints" => \$hint,
  48         "search-string=s" => \$search_string,
  49         man => \$man
  50 ) or pod2usage(2);
  51
  52 pod2usage(1) if $help;
  53 pod2usage(-exitstatus => 0, -noperldoc, -verbose => 2) if $man;
  54
  55 pod2usage(2) if (scalar @ARGV < 1 || @ARGV > 2);
  56
  57 my ($cmd, $arg) = @ARGV;
  58
  59 pod2usage(2) if ($cmd ne "search" && $cmd ne "rest" && $cmd ne "validate" && $cmd ne "undefined");
  60 pod2usage(2) if ($cmd eq "search" && !$arg);
  61
  62 require Data::Dumper if ($debug & $dbg_dump_abi_structs);
  63
  64 my %data;
  65 my %symbols;
  66
  67 #
  68 # Displays an error message, printing file name and line
  69 #
  70 sub parse_error($$$$) {
  71         my ($file, $ln, $msg, $data) = @_;
  72
  73         return if (!$show_warnings);
  74
  75         $data =~ s/\s+$/\n/;
  76
  77         print STDERR "Warning: file $file#$ln:\n\t$msg";
  78
  79         if ($data ne "") {
  80                 print STDERR ". Line\n\t\t$data";
  81         } else {
  82             print STDERR "\n";
  83         }
  84 }
  85
  86 #
  87 # Parse an ABI file, storing its contents at %data
  88 #
  89 sub parse_abi {
  90         my $file = $File::Find::name;
  91
  92         my $mode = (stat($file))[2];
  93         return if ($mode & S_IFDIR);
  94         return if ($file =~ m,/README,);
  95         return if ($file =~ m,/\.,);
  96
  97         my $name = $file;
  98         $name =~ s,.*/,,;
  99
 100         my $fn = $file;
 101         $fn =~ s,Documentation/ABI/,,;
 102
 103         my $nametag = "File $fn";
 104         $data{$nametag}->{what} = "File $name";
 105         $data{$nametag}->{type} = "File";
 106         $data{$nametag}->{file} = $name;
 107         $data{$nametag}->{filepath} = $file;
 108         $data{$nametag}->{is_file} = 1;
 109         $data{$nametag}->{line_no} = 1;
 110
 111         my $type = $file;
 112         $type =~ s,.*/(.*)/.*,$1,;
 113
 114         my $what;
 115         my $new_what;
 116         my $tag = "";
 117         my $ln;
 118         my $xrefs;
 119         my $space;
 120         my @labels;
 121         my $label = "";
 122
 123         print STDERR "Opening $file\n" if ($debug & $dbg_what_open);
 124         open IN, $file;
 125         while(<IN>) {
 126                 $ln++;
 127                 if (m/^(\S+)(:\s*)(.*)/i) {
 128                         my $new_tag = lc($1);
 129                         my $sep = $2;
 130                         my $content = $3;
 131
 132                         if (!($new_tag =~ m/(what|where|date|kernelversion|contact|description|users)/)) {
 133                                 if ($tag eq "description") {
 134                                         # New "tag" is actually part of
 135                                         # description. Don't consider it a tag
 136                                         $new_tag = "";
 137                                 } elsif ($tag ne "") {
 138                                         parse_error($file, $ln, "tag '$tag' is invalid", $_);
 139                                 }
 140                         }
 141
 142                         # Invalid, but it is a common mistake
 143                         if ($new_tag eq "where") {
 144                                 parse_error($file, $ln, "tag 'Where' is invalid. Should be 'What:' instead", "");
 145                                 $new_tag = "what";
 146                         }
 147
 148                         if ($new_tag =~ m/what/) {
 149                                 $space = "";
 150                                 $content =~ s/[,.;]$//;
 151
 152                                 push @{$symbols{$content}->{file}}, " $file:" . ($ln - 1);
 153
 154                                 if ($tag =~ m/what/) {
 155                                         $what .= "\xac" . $content;
 156                                 } else {
 157                                         if ($what) {
 158                                                 parse_error($file, $ln, "What '$what' doesn't have a description", "") if (!$data{$what}->{description});
 159
 160                                                 foreach my $w(split /\xac/, $what) {
 161                                                         $symbols{$w}->{xref} = $what;
 162                                                 };
 163                                         }
 164
 165                                         $what = $content;
 166                                         $label = $content;
 167                                         $new_what = 1;
 168                                 }
 169                                 push @labels, [($content, $label)];
 170                                 $tag = $new_tag;
 171
 172                                 push @{$data{$nametag}->{symbols}}, $content if ($data{$nametag}->{what});
 173                                 next;
 174                         }
 175
 176                         if ($tag ne "" && $new_tag) {
 177                                 $tag = $new_tag;
 178
 179                                 if ($new_what) {
 180                                         @{$data{$what}->{label_list}} = @labels if ($data{$nametag}->{what});
 181                                         @labels = ();
 182                                         $label = "";
 183                                         $new_what = 0;
 184
 185                                         $data{$what}->{type} = $type;
 186                                         if (!defined($data{$what}->{file})) {
 187                                                 $data{$what}->{file} = $name;
 188                                                 $data{$what}->{filepath} = $file;
 189                                         } else {
 190                                                 $data{$what}->{description} .= "\n\n" if (defined($data{$what}->{description}));
 191                                                 if ($name ne $data{$what}->{file}) {
 192                                                         $data{$what}->{file} .= " " . $name;
 193                                                         $data{$what}->{filepath} .= " " . $file;
 194                                                 }
 195                                         }
 196                                         print STDERR "\twhat: $what\n" if ($debug & $dbg_what_parsing);
 197                                         $data{$what}->{line_no} = $ln;
 198                                 } else {
 199                                         $data{$what}->{line_no} = $ln if (!defined($data{$what}->{line_no}));
 200                                 }
 201
 202                                 if (!$what) {
 203                                         parse_error($file, $ln, "'What:' should come first:", $_);
 204                                         next;
 205                                 }
 206                                 if ($new_tag eq "description") {
 207                                         $sep =~ s,:, ,;
 208                                         $content = ' ' x length($new_tag) . $sep . $content;
 209                                         while ($content =~ s/\t+/' ' x (length($&) * 8 - length($`) % 8)/e) {}
 210                                         if ($content =~ m/^(\s*)(\S.*)$/) {
 211                                                 # Preserve initial spaces for the first line
 212                                                 $space = $1;
 213                                                 $content = "$2\n";
 214                                                 $data{$what}->{$tag} .= $content;
 215                                         } else {
 216                                                 undef($space);
 217                                         }
 218
 219                                 } else {
 220                                         $data{$what}->{$tag} = $content;
 221                                 }
 222                                 next;
 223                         }
 224                 }
 225
 226                 # Store any contents before tags at the database
 227                 if (!$tag && $data{$nametag}->{what}) {
 228                         $data{$nametag}->{description} .= $_;
 229                         next;
 230                 }
 231
 232                 if ($tag eq "description") {
 233                         my $content = $_;
 234                         while ($content =~ s/\t+/' ' x (length($&) * 8 - length($`) % 8)/e) {}
 235                         if (m/^\s*\n/) {
 236                                 $data{$what}->{$tag} .= "\n";
 237                                 next;
 238                         }
 239
 240                         if (!defined($space)) {
 241                                 # Preserve initial spaces for the first line
 242                                 if ($content =~ m/^(\s*)(\S.*)$/) {
 243                                         $space = $1;
 244                                         $content = "$2\n";
 245                                 }
 246                         } else {
 247                                 $space = "" if (!($content =~ s/^($space)//));
 248                         }
 249                         $data{$what}->{$tag} .= $content;
 250
 251                         next;
 252                 }
 253                 if (m/^\s*(.*)/) {
 254                         $data{$what}->{$tag} .= "\n$1";
 255                         $data{$what}->{$tag} =~ s/\n+$//;
 256                         next;
 257                 }
 258
 259                 # Everything else is error
 260                 parse_error($file, $ln, "Unexpected content", $_);
 261         }
 262         $data{$nametag}->{description} =~ s/^\n+// if ($data{$nametag}->{description});
 263         if ($what) {
 264                 parse_error($file, $ln, "What '$what' doesn't have a description", "") if (!$data{$what}->{description});
 265
 266                 foreach my $w(split /\xac/,$what) {
 267                         $symbols{$w}->{xref} = $what;
 268                 };
 269         }
 270         close IN;
 271 }
 272
 273 sub create_labels {
 274         my %labels;
 275
 276         foreach my $what (keys %data) {
 277                 next if ($data{$what}->{file} eq "File");
 278
 279                 foreach my $p (@{$data{$what}->{label_list}}) {
 280                         my ($content, $label) = @{$p};
 281                         $label = "abi_" . $label . " ";
 282                         $label =~ tr/A-Z/a-z/;
 283
 284                         # Convert special chars to "_"
 285                         $label =~s/([\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\xff])/_/g;
 286                         $label =~ s,_+,_,g;
 287                         $label =~ s,_$,,;
 288
 289                         # Avoid duplicated labels
 290                         while (defined($labels{$label})) {
 291                             my @chars = ("A".."Z", "a".."z");
 292                             $label .= $chars[rand @chars];
 293                         }
 294                         $labels{$label} = 1;
 295
 296                         $data{$what}->{label} = $label;
 297
 298                         # only one label is enough
 299                         last;
 300                 }
 301         }
 302 }
 303
 304 #
 305 # Outputs the book on ReST format
 306 #
 307
 308 # \b doesn't work well with paths. So, we need to define something else:
 309 # Boundaries are punct characters, spaces and end-of-line
 310 my $start = qr {(^|\s|\() }x;
 311 my $bondary = qr { ([,.:;\)\s]|\z) }x;
 312 my $xref_match = qr { $start(\/(sys|config|proc|dev|kvd)\/[^,.:;\)\s]+)$bondary }x;
 313 my $symbols = qr { ([\x01-\x08\x0e-\x1f\x21-\x2f\x3a-\x40\x7b-\xff]) }x;
 314
 315 sub output_rest {
 316         create_labels();
 317
 318         my $part = "";
 319
 320         foreach my $what (sort {
 321                                 ($data{$a}->{type} eq "File") cmp ($data{$b}->{type} eq "File") ||
 322                                 $a cmp $b
 323                                } keys %data) {
 324                 my $type = $data{$what}->{type};
 325
 326                 my @file = split / /, $data{$what}->{file};
 327                 my @filepath = split / /, $data{$what}->{filepath};
 328
 329                 if ($enable_lineno) {
 330                         printf ".. LINENO %s%s#%s\n\n",
 331                                $prefix, $file[0],
 332                                $data{$what}->{line_no};
 333                 }
 334
 335                 my $w = $what;
 336
 337                 if ($type ne "File") {
 338                         my $cur_part = $what;
 339                         if ($what =~ '/') {
 340                                 if ($what =~ m#^(\/?(?:[\w\-]+\/?){1,2})#) {
 341                                         $cur_part = "Symbols under $1";
 342                                         $cur_part =~ s,/$,,;
 343                                 }
 344                         }
 345
 346                         if ($cur_part ne "" && $part ne $cur_part) {
 347                             $part = $cur_part;
 348                             my $bar = $part;
 349                             $bar =~ s/./-/g;
 350                             print "$part\n$bar\n\n";
 351                         }
 352
 353                         printf ".. _%s:\n\n", $data{$what}->{label};
 354
 355                         my @names = split /\xac/,$w;
 356                         my $len = 0;
 357
 358                         foreach my $name (@names) {
 359                                 $name =~ s/$symbols/\\$1/g;
 360                                 $name = "**$name**";
 361                                 $len = length($name) if (length($name) > $len);
 362                         }
 363
 364                         print "+-" . "-" x $len . "-+\n";
 365                         foreach my $name (@names) {
 366                                 printf "| %s", $name . " " x ($len - length($name)) . " |\n";
 367                                 print "+-" . "-" x $len . "-+\n";
 368                         }
 369
 370                         print "\n";
 371                 }
 372
 373                 for (my $i = 0; $i < scalar(@filepath); $i++) {
 374                         my $path = $filepath[$i];
 375                         my $f = $file[$i];
 376
 377                         $path =~ s,.*/(.*/.*),$1,;;
 378                         $path =~ s,[/\-],_,g;;
 379                         my $fileref = "abi_file_".$path;
 380
 381                         if ($type eq "File") {
 382                                 print ".. _$fileref:\n\n";
 383                         } else {
 384                                 print "Defined on file :ref:`$f <$fileref>`\n\n";
 385                         }
 386                 }
 387
 388                 if ($type eq "File") {
 389                         my $bar = $w;
 390                         $bar =~ s/./-/g;
 391                         print "$w\n$bar\n\n";
 392                 }
 393
 394                 my $desc = "";
 395                 $desc = $data{$what}->{description} if (defined($data{$what}->{description}));
 396                 $desc =~ s/\s+$/\n/;
 397
 398                 if (!($desc =~ /^\s*$/)) {
 399                         if ($description_is_rst) {
 400                                 # Remove title markups from the description
 401                                 # Having titles inside ABI files will only work if extra
 402                                 # care would be taken in order to strictly follow the same
 403                                 # level order for each markup.
 404                                 $desc =~ s/\n[\-\*\=\^\~]+\n/\n\n/g;
 405
 406                                 # Enrich text by creating cross-references
 407
 408                                 my $new_desc = "";
 409                                 my $init_indent = -1;
 410                                 my $literal_indent = -1;
 411
 412                                 open(my $fh, "+<", \$desc);
 413                                 while (my $d = <$fh>) {
 414                                         my $indent = $d =~ m/^(\s+)/;
 415                                         my $spaces = length($indent);
 416                                         $init_indent = $indent if ($init_indent < 0);
 417                                         if ($literal_indent >= 0) {
 418                                                 if ($spaces > $literal_indent) {
 419                                                         $new_desc .= $d;
 420                                                         next;
 421                                                 } else {
 422                                                         $literal_indent = -1;
 423                                                 }
 424                                         } else {
 425                                                 if ($d =~ /()::$/ && !($d =~ /^\s*\.\./)) {
 426                                                         $literal_indent = $spaces;
 427                                                 }
 428                                         }
 429
 430                                         $d =~ s,Documentation/(?!devicetree)(\S+)\.rst,:doc:`/$1`,g;
 431
 432                                         my @matches = $d =~ m,Documentation/ABI/([\w\/\-]+),g;
 433                                         foreach my $f (@matches) {
 434                                                 my $xref = $f;
 435                                                 my $path = $f;
 436                                                 $path =~ s,.*/(.*/.*),$1,;;
 437                                                 $path =~ s,[/\-],_,g;;
 438                                                 $xref .= " <abi_file_" . $path . ">";
 439                                                 $d =~ s,\bDocumentation/ABI/$f\b,:ref:`$xref`,g;
 440                                         }
 441
 442                                         # Seek for cross reference symbols like /sys/...
 443                                         @matches = $d =~ m/$xref_match/g;
 444
 445                                         foreach my $s (@matches) {
 446                                                 next if (!($s =~ m,/,));
 447                                                 if (defined($data{$s}) && defined($data{$s}->{label})) {
 448                                                         my $xref = $s;
 449
 450                                                         $xref =~ s/$symbols/\\$1/g;
 451                                                         $xref = ":ref:`$xref <" . $data{$s}->{label} . ">`";
 452
 453                                                         $d =~ s,$start$s$bondary,$1$xref$2,g;
 454                                                 }
 455                                         }
 456                                         $new_desc .= $d;
 457                                 }
 458                                 close $fh;
 459
 460
 461                                 print "$new_desc\n\n";
 462                         } else {
 463                                 $desc =~ s/^\s+//;
 464
 465                                 # Remove title markups from the description, as they won't work
 466                                 $desc =~ s/\n[\-\*\=\^\~]+\n/\n\n/g;
 467
 468                                 if ($desc =~ m/\:\n/ || $desc =~ m/\n[\t ]+/  || $desc =~ m/[\x00-\x08\x0b-\x1f\x7b-\xff]/) {
 469                                         # put everything inside a code block
 470                                         $desc =~ s/\n/\n /g;
 471
 472                                         print "::\n\n";
 473                                         print " $desc\n\n";
 474                                 } else {
 475                                         # Escape any special chars from description
 476                                         $desc =~s/([\x00-\x08\x0b-\x1f\x21-\x2a\x2d\x2f\x3c-\x40\x5c\x5e-\x60\x7b-\xff])/\\$1/g;
 477                                         print "$desc\n\n";
 478                                 }
 479                         }
 480                 } else {
 481                         print "DESCRIPTION MISSING for $what\n\n" if (!$data{$what}->{is_file});
 482                 }
 483
 484                 if ($data{$what}->{symbols}) {
 485                         printf "Has the following ABI:\n\n";
 486
 487                         foreach my $content(@{$data{$what}->{symbols}}) {
 488                                 my $label = $data{$symbols{$content}->{xref}}->{label};
 489
 490                                 # Escape special chars from content
 491                                 $content =~s/([\x00-\x1f\x21-\x2f\x3a-\x40\x7b-\xff])/\\$1/g;
 492
 493                                 print "- :ref:`$content <$label>`\n\n";
 494                         }
 495                 }
 496
 497                 if (defined($data{$what}->{users})) {
 498                         my $users = $data{$what}->{users};
 499
 500                         $users =~ s/\n/\n\t/g;
 501                         printf "Users:\n\t%s\n\n", $users if ($users ne "");
 502                 }
 503
 504         }
 505 }
 506
 507 #
 508 # Searches for ABI symbols
 509 #
 510 sub search_symbols {
 511         foreach my $what (sort keys %data) {
 512                 next if (!($what =~ m/($arg)/));
 513
 514                 my $type = $data{$what}->{type};
 515                 next if ($type eq "File");
 516
 517                 my $file = $data{$what}->{filepath};
 518
 519                 $what =~ s/\xac/, /g;
 520                 my $bar = $what;
 521                 $bar =~ s/./-/g;
 522
 523                 print "\n$what\n$bar\n\n";
 524
 525                 my $kernelversion = $data{$what}->{kernelversion} if (defined($data{$what}->{kernelversion}));
 526                 my $contact = $data{$what}->{contact} if (defined($data{$what}->{contact}));
 527                 my $users = $data{$what}->{users} if (defined($data{$what}->{users}));
 528                 my $date = $data{$what}->{date} if (defined($data{$what}->{date}));
 529                 my $desc = $data{$what}->{description} if (defined($data{$what}->{description}));
 530
 531                 $kernelversion =~ s/^\s+// if ($kernelversion);
 532                 $contact =~ s/^\s+// if ($contact);
 533                 if ($users) {
 534                         $users =~ s/^\s+//;
 535                         $users =~ s/\n//g;
 536                 }
 537                 $date =~ s/^\s+// if ($date);
 538                 $desc =~ s/^\s+// if ($desc);
 539
 540                 printf "Kernel version:\t\t%s\n", $kernelversion if ($kernelversion);
 541                 printf "Date:\t\t\t%s\n", $date if ($date);
 542                 printf "Contact:\t\t%s\n", $contact if ($contact);
 543                 printf "Users:\t\t\t%s\n", $users if ($users);
 544                 print "Defined on file(s):\t$file\n\n";
 545                 print "Description:\n\n$desc";
 546         }
 547 }
 548
 549 # Exclude /sys/kernel/debug and /sys/kernel/tracing from the search path
 550 sub dont_parse_special_attributes {
 551         if (($File::Find::dir =~ m,^/sys/kernel,)) {
 552                 return grep {!/(debug|tracing)/ } @_;
 553         }
 554
 555         if (($File::Find::dir =~ m,^/sys/fs,)) {
 556                 return grep {!/(pstore|bpf|fuse)/ } @_;
 557         }
 558
 559         return @_
 560 }
 561
 562 my %leaf;
 563 my %aliases;
 564 my @files;
 565 my %root;
 566
 567 sub graph_add_file {
 568         my $file = shift;
 569         my $type = shift;
 570
 571         my $dir = $file;
 572         $dir =~ s,^(.*/).*,$1,;
 573         $file =~ s,.*/,,;
 574
 575         my $name;
 576         my $file_ref = \%root;
 577         foreach my $edge(split "/", $dir) {
 578                 $name .= "$edge/";
 579                 if (!defined ${$file_ref}{$edge}) {
 580                         ${$file_ref}{$edge} = { };
 581                 }
 582                 $file_ref = \%{$$file_ref{$edge}};
 583                 ${$file_ref}{"__name"} = [ $name ];
 584         }
 585         $name .= "$file";
 586         ${$file_ref}{$file} = {
 587                 "__name" => [ $name ]
 588         };
 589
 590         return \%{$$file_ref{$file}};
 591 }
 592
 593 sub graph_add_link {
 594         my $file = shift;
 595         my $link = shift;
 596
 597         # Traverse graph to find the reference
 598         my $file_ref = \%root;
 599         foreach my $edge(split "/", $file) {
 600                 $file_ref = \%{$$file_ref{$edge}} || die "Missing node!";
 601         }
 602
 603         # do a BFS
 604
 605         my @queue;
 606         my %seen;
 607         my $st;
 608
 609         push @queue, $file_ref;
 610         $seen{$start}++;
 611
 612         while (@queue) {
 613                 my $v = shift @queue;
 614                 my @child = keys(%{$v});
 615
 616                 foreach my $c(@child) {
 617                         next if $seen{$$v{$c}};
 618                         next if ($c eq "__name");
 619
 620                         if (!defined($$v{$c}{"__name"})) {
 621                                 printf STDERR "Error: Couldn't find a non-empty name on a children of $file/.*: ";
 622                                 print STDERR Dumper(%{$v});
 623                                 exit;
 624                         }
 625
 626                         # Add new name
 627                         my $name = @{$$v{$c}{"__name"}}[0];
 628                         if ($name =~ s#^$file/#$link/#) {
 629                                 push @{$$v{$c}{"__name"}}, $name;
 630                         }
 631                         # Add child to the queue and mark as seen
 632                         push @queue, $$v{$c};
 633                         $seen{$c}++;
 634                 }
 635         }
 636 }
 637
 638 my $escape_symbols = qr { ([\x01-\x08\x0e-\x1f\x21-\x29\x2b-\x2d\x3a-\x40\x7b-\xfe]) }x;
 639 sub parse_existing_sysfs {
 640         my $file = $File::Find::name;
 641
 642         my $mode = (lstat($file))[2];
 643         my $abs_file = abs_path($file);
 644
 645         my @tmp;
 646         push @tmp, $file;
 647         push @tmp, $abs_file if ($abs_file ne $file);
 648
 649         foreach my $f(@tmp) {
 650                 # Ignore cgroup, as this is big and has zero docs under ABI
 651                 return if ($f =~ m#^/sys/fs/cgroup/#);
 652
 653                 # Ignore firmware as it is documented elsewhere
 654                 # Either ACPI or under Documentation/devicetree/bindings/
 655                 return if ($f =~ m#^/sys/firmware/#);
 656
 657                 # Ignore some sysfs nodes that aren't actually part of ABI
 658                 return if ($f =~ m#/sections|notes/#);
 659
 660                 # Would need to check at
 661                 # Documentation/admin-guide/kernel-parameters.txt, but this
 662                 # is not easily parseable.
 663                 return if ($f =~ m#/parameters/#);
 664         }
 665
 666         if (S_ISLNK($mode)) {
 667                 $aliases{$file} = $abs_file;
 668                 return;
 669         }
 670
 671         return if (S_ISDIR($mode));
 672
 673         # Trivial: file is defined exactly the same way at ABI What:
 674         return if (defined($data{$file}));
 675         return if (defined($data{$abs_file}));
 676
 677         push @files, graph_add_file($abs_file, "file");
 678 }
 679
 680 sub get_leave($)
 681 {
 682         my $what = shift;
 683         my $leave;
 684
 685         my $l = $what;
 686         my $stop = 1;
 687
 688         $leave = $l;
 689         $leave =~ s,/$,,;
 690         $leave =~ s,.*/,,;
 691         $leave =~ s/[\(\)]//g;
 692
 693         # $leave is used to improve search performance at
 694         # check_undefined_symbols, as the algorithm there can seek
 695         # for a small number of "what". It also allows giving a
 696         # hint about a leave with the same name somewhere else.
 697         # However, there are a few occurences where the leave is
 698         # either a wildcard or a number. Just group such cases
 699         # altogether.
 700         if ($leave =~ m/\.\*/ || $leave eq "" || $leave =~ /\\d/) {
 701                 $leave = "others";
 702         }
 703
 704         return $leave;
 705 }
 706
 707 my @not_found;
 708
 709 sub check_file($$)
 710 {
 711         my $file_ref = shift;
 712         my $names_ref = shift;
 713         my @names = @{$names_ref};
 714         my $file = $names[0];
 715
 716         my $found_string;
 717
 718         my $leave = get_leave($file);
 719         if (!defined($leaf{$leave})) {
 720                 $leave = "others";
 721         }
 722         my @expr = @{$leaf{$leave}->{expr}};
 723         die ("\rmissing rules for $leave") if (!defined($leaf{$leave}));
 724
 725         my $path = $file;
 726         $path =~ s,(.*/).*,$1,;
 727
 728         if ($search_string) {
 729                 return if (!($file =~ m#$search_string#));
 730                 $found_string = 1;
 731         }
 732
 733         for (my $i = 0; $i < @names; $i++) {
 734                 if ($found_string && $hint) {
 735                         if (!$i) {
 736                                 print STDERR "--> $names[$i]\n";
 737                         } else {
 738                                 print STDERR "    $names[$i]\n";
 739                         }
 740                 }
 741                 foreach my $re (@expr) {
 742                         print STDERR "$names[$i] =~ /^$re\$/\n" if ($debug && $dbg_undefined);
 743                         if ($names[$i] =~ $re) {
 744                                 return;
 745                         }
 746                 }
 747         }
 748
 749         if ($leave ne "others") {
 750                 my @expr = @{$leaf{"others"}->{expr}};
 751                 for (my $i = 0; $i < @names; $i++) {
 752                         foreach my $re (@expr) {
 753                                 print STDERR "$names[$i] =~ /^$re\$/\n" if ($debug && $dbg_undefined);
 754                                 if ($names[$i] =~ $re) {
 755                                         return;
 756                                 }
 757                         }
 758                 }
 759         }
 760
 761         push @not_found, $file if (!$search_string || $found_string);
 762
 763         if ($hint && (!$search_string || $found_string)) {
 764                 my $what = $leaf{$leave}->{what};
 765                 $what =~ s/\xac/\n\t/g;
 766                 if ($leave ne "others") {
 767                         print STDERR "\r    more likely regexes:\n\t$what\n";
 768                 } else {
 769                         print STDERR "\r    tested regexes:\n\t$what\n";
 770                 }
 771         }
 772 }
 773
 774 sub check_undefined_symbols {
 775         my $num_files = scalar @files;
 776         my $next_i = 0;
 777         my $start_time = times;
 778
 779         @files = sort @files;
 780
 781         my $last_time = $start_time;
 782
 783         # When either debug or hint is enabled, there's no sense showing
 784         # progress, as the progress will be overriden.
 785         if ($hint || ($debug && $dbg_undefined)) {
 786                 $next_i = $num_files;
 787         }
 788
 789         my $is_console;
 790         $is_console = 1 if (-t STDERR);
 791
 792         for (my $i = 0; $i < $num_files; $i++) {
 793                 my $file_ref = $files[$i];
 794                 my @names = @{$$file_ref{"__name"}};
 795
 796                 check_file($file_ref, \@names);
 797
 798                 my $cur_time = times;
 799
 800                 if ($i == $next_i || $cur_time > $last_time + 1) {
 801                         my $percent = $i * 100 / $num_files;
 802
 803                         my $tm = $cur_time - $start_time;
 804                         my $time = sprintf "%d:%02d", int($tm), 60 * ($tm - int($tm));
 805
 806                         printf STDERR "\33[2K\r", if ($is_console);
 807                         printf STDERR "%s: processing sysfs files... %i%%: $names[0]", $time, $percent;
 808                         printf STDERR "\n", if (!$is_console);
 809                         STDERR->flush();
 810
 811                         $next_i = int (($percent + 1) * $num_files / 100);
 812                         $last_time = $cur_time;
 813                 }
 814         }
 815
 816         my $cur_time = times;
 817         my $tm = $cur_time - $start_time;
 818         my $time = sprintf "%d:%02d", int($tm), 60 * ($tm - int($tm));
 819
 820         printf STDERR "\33[2K\r", if ($is_console);
 821         printf STDERR "%s: processing sysfs files... done\n", $time;
 822
 823         foreach my $file (@not_found) {
 824                 print "$file not found.\n";
 825         }
 826 }
 827
 828 sub undefined_symbols {
 829         print STDERR "Reading $sysfs_prefix directory contents...";
 830         find({
 831                 wanted =>\&parse_existing_sysfs,
 832                 preprocess =>\&dont_parse_special_attributes,
 833                 no_chdir => 1
 834              }, $sysfs_prefix);
 835         print STDERR "done.\n";
 836
 837         $leaf{"others"}->{what} = "";
 838
 839         print STDERR "Converting ABI What fields into regexes...";
 840         foreach my $w (sort keys %data) {
 841                 foreach my $what (split /\xac/,$w) {
 842                         next if (!($what =~ m/^$sysfs_prefix/));
 843
 844                         # Convert what into regular expressions
 845
 846                         # Escape dot characters
 847                         $what =~ s/\./\xf6/g;
 848
 849                         # Temporarily change [0-9]+ type of patterns
 850                         $what =~ s/\[0\-9\]\+/\xff/g;
 851
 852                         # Temporarily change [\d+-\d+] type of patterns
 853                         $what =~ s/\[0\-\d+\]/\xff/g;
 854                         $what =~ s/\[(\d+)\]/\xf4$1\xf5/g;
 855
 856                         # Temporarily change [0-9] type of patterns
 857                         $what =~ s/\[(\d)\-(\d)\]/\xf4$1-$2\xf5/g;
 858
 859                         # Handle multiple option patterns
 860                         $what =~ s/[\{\<\[]([\w_]+)(?:[,|]+([\w_]+)){1,}[\}\>\]]/($1|$2)/g;
 861
 862                         # Handle wildcards
 863                         $what =~ s,\*,.*,g;
 864                         $what =~ s,/\xf6..,/.*,g;
 865                         $what =~ s/\<[^\>]+\>/.*/g;
 866                         $what =~ s/\{[^\}]+\}/.*/g;
 867                         $what =~ s/\[[^\]]+\]/.*/g;
 868
 869                         $what =~ s/[XYZ]/.*/g;
 870
 871                         # Recover [0-9] type of patterns
 872                         $what =~ s/\xf4/[/g;
 873                         $what =~ s/\xf5/]/g;
 874
 875                         # Remove duplicated spaces
 876                         $what =~ s/\s+/ /g;
 877
 878                         # Special case: this ABI has a parenthesis on it
 879                         $what =~ s/sqrt\(x^2\+y^2\+z^2\)/sqrt\(x^2\+y^2\+z^2\)/;
 880
 881                         # Special case: drop comparition as in:
 882                         #       What: foo = <something>
 883                         # (this happens on a few IIO definitions)
 884                         $what =~ s,\s*\=.*$,,;
 885
 886                         # Escape all other symbols
 887                         $what =~ s/$escape_symbols/\\$1/g;
 888                         $what =~ s/\\\\/\\/g;
 889                         $what =~ s/\\([\[\]\(\)\|])/$1/g;
 890                         $what =~ s/(\d+)\\(-\d+)/$1$2/g;
 891
 892                         $what =~ s/\xff/\\d+/g;
 893
 894                         # Special case: IIO ABI which a parenthesis.
 895                         $what =~ s/sqrt(.*)/sqrt\(.*\)/;
 896
 897                         # Simplify regexes with multiple .*
 898                         $what =~ s#(?:\.\*){2,}##g;
 899 #                       $what =~ s#\.\*/\.\*#.*#g;
 900
 901                         # Recover dot characters
 902                         $what =~ s/\xf6/\./g;
 903
 904                         my $leave = get_leave($what);
 905
 906                         my $added = 0;
 907                         foreach my $l (split /\|/, $leave) {
 908                                 if (defined($leaf{$l})) {
 909                                         next if ($leaf{$l}->{what} =~ m/\b$what\b/);
 910                                         $leaf{$l}->{what} .= "\xac" . $what;
 911                                         $added = 1;
 912                                 } else {
 913                                         $leaf{$l}->{what} = $what;
 914                                         $added = 1;
 915                                 }
 916                         }
 917                         if ($search_string && $added) {
 918                                 print STDERR "What: $what\n" if ($what =~ m#$search_string#);
 919                         }
 920
 921                 }
 922         }
 923         # Compile regexes
 924         foreach my $l (sort keys %leaf) {
 925                 my @expr;
 926                 foreach my $w(sort split /\xac/, $leaf{$l}->{what}) {
 927                         push @expr, qr /^$w$/;
 928                 }
 929                 $leaf{$l}->{expr} = \@expr;
 930         }
 931
 932         # Take links into account
 933         foreach my $link (sort keys %aliases) {
 934                 my $abs_file = $aliases{$link};
 935                 graph_add_link($abs_file, $link);
 936         }
 937         print STDERR "done.\n";
 938
 939         check_undefined_symbols;
 940 }
 941
 942 # Ensure that the prefix will always end with a slash
 943 # While this is not needed for find, it makes the patch nicer
 944 # with --enable-lineno
 945 $prefix =~ s,/?$,/,;
 946
 947 if ($cmd eq "undefined" || $cmd eq "search") {
 948         $show_warnings = 0;
 949 }
 950 #
 951 # Parses all ABI files located at $prefix dir
 952 #
 953 find({wanted =>\&parse_abi, no_chdir => 1}, $prefix);
 954
 955 print STDERR Data::Dumper->Dump([\%data], [qw(*data)]) if ($debug & $dbg_dump_abi_structs);
 956
 957 #
 958 # Handles the command
 959 #
 960 if ($cmd eq "undefined") {
 961         undefined_symbols;
 962 } elsif ($cmd eq "search") {
 963         search_symbols;
 964 } else {
 965         if ($cmd eq "rest") {
 966                 output_rest;
 967         }
 968
 969         # Warn about duplicated ABI entries
 970         foreach my $what(sort keys %symbols) {
 971                 my @files = @{$symbols{$what}->{file}};
 972
 973                 next if (scalar(@files) == 1);
 974
 975                 printf STDERR "Warning: $what is defined %d times: @files\n",
 976                     scalar(@files);
 977         }
 978 }
 979
 980 __END__
 981
 982 =head1 NAME
 983
 984 get_abi.pl - parse the Linux ABI files and produce a ReST book.
 985
 986 =head1 SYNOPSIS
 987
 988 B<get_abi.pl> [--debug <level>] [--enable-lineno] [--man] [--help]
 989                [--(no-)rst-source] [--dir=<dir>] [--show-hints]
 990                [--search-string <regex>]
 991                <COMMAND> [<ARGUMENT>]
 992
 993 Where B<COMMAND> can be:
 994
 995 =over 8
 996
 997 B<search> I<SEARCH_REGEX> - search for I<SEARCH_REGEX> inside ABI
 998
 999 B<rest>                   - output the ABI in ReST markup language
1000
1001 B<validate>               - validate the ABI contents
1002
1003 B<undefined>              - existing symbols at the system that aren't
1004                             defined at Documentation/ABI
1005
1006 =back
1007
1008 =head1 OPTIONS
1009
1010 =over 8
1011
1012 =item B<--dir>
1013
1014 Changes the location of the ABI search. By default, it uses
1015 the Documentation/ABI directory.
1016
1017 =item B<--rst-source> and B<--no-rst-source>
1018
1019 The input file may be using ReST syntax or not. Those two options allow
1020 selecting between a rst-compliant source ABI (B<--rst-source>), or a
1021 plain text that may be violating ReST spec, so it requres some escaping
1022 logic (B<--no-rst-source>).
1023
1024 =item B<--enable-lineno>
1025
1026 Enable output of .. LINENO lines.
1027
1028 =item B<--debug> I<debug level>
1029
1030 Print debug information according with the level, which is given by the
1031 following bitmask:
1032
1033     -  1: Debug parsing What entries from ABI files;
1034     -  2: Shows what files are opened from ABI files;
1035     -  4: Dump the structs used to store the contents of the ABI files.
1036
1037 =item B<--show-hints>
1038
1039 Show hints about possible definitions for the missing ABI symbols.
1040 Used only when B<undefined>.
1041
1042 =item B<--search-string> I<regex string>
1043
1044 Show only occurences that match a search string.
1045 Used only when B<undefined>.
1046
1047 =item B<--help>
1048
1049 Prints a brief help message and exits.
1050
1051 =item B<--man>
1052
1053 Prints the manual page and exits.
1054
1055 =back
1056
1057 =head1 DESCRIPTION
1058
1059 Parse the Linux ABI files from ABI DIR (usually located at Documentation/ABI),
1060 allowing to search for ABI symbols or to produce a ReST book containing
1061 the Linux ABI documentation.
1062
1063 =head1 EXAMPLES
1064
1065 Search for all stable symbols with the word "usb":
1066
1067 =over 8
1068
1069 $ scripts/get_abi.pl search usb --dir Documentation/ABI/stable
1070
1071 =back
1072
1073 Search for all symbols that match the regex expression "usb.*cap":
1074
1075 =over 8
1076
1077 $ scripts/get_abi.pl search usb.*cap
1078
1079 =back
1080
1081 Output all obsoleted symbols in ReST format
1082
1083 =over 8
1084
1085 $ scripts/get_abi.pl rest --dir Documentation/ABI/obsolete
1086
1087 =back
1088
1089 =head1 BUGS
1090
1091 Report bugs to Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
1092
1093 =head1 COPYRIGHT
1094
1095 Copyright (c) 2016-2021 by Mauro Carvalho Chehab <mchehab+huawei@kernel.org>.
1096
1097 License GPLv2: GNU GPL version 2 <http://gnu.org/licenses/gpl.html>.
1098
1099 This is free software: you are free to change and redistribute it.
1100 There is NO WARRANTY, to the extent permitted by law.
1101
1102 =cut