scripts/kernel-doc

   1 #!/usr/bin/env perl
   2 # SPDX-License-Identifier: GPL-2.0
   3 # vim: softtabstop=4
   4
   5 use warnings;
   6 use strict;
   7
   8 ## Copyright (c) 1998 Michael Zucchi, All Rights Reserved        ##
   9 ## Copyright (C) 2000, 1  Tim Waugh <twaugh@redhat.com>          ##
  10 ## Copyright (C) 2001  Simon Huggins                             ##
  11 ## Copyright (C) 2005-2012  Randy Dunlap                         ##
  12 ## Copyright (C) 2012  Dan Luedtke                               ##
  13 ##                                                               ##
  14 ## #define enhancements by Armin Kuster <akuster@mvista.com>     ##
  15 ## Copyright (c) 2000 MontaVista Software, Inc.                  ##
  16 #
  17 # Copyright (C) 2022 Tomasz Warniełło (POD)
  18
  19 use Pod::Usage qw/pod2usage/;
  20
  21 =head1 NAME
  22
  23 kernel-doc - Print formatted kernel documentation to stdout
  24
  25 =head1 SYNOPSIS
  26
  27  kernel-doc [-h] [-v] [-Werror] [-Wall] [-Wreturn] [-Wshort-desc[ription]] [-Wcontents-before-sections]
  28    [ -man |
  29      -rst [-sphinx-version VERSION] [-enable-lineno] |
  30      -none
  31    ]
  32    [
  33      -export |
  34      -internal |
  35      [-function NAME] ... |
  36      [-nosymbol NAME] ...
  37    ]
  38    [-no-doc-sections]
  39    [-export-file FILE] ...
  40    FILE ...
  41
  42 Run `kernel-doc -h` for details.
  43
  44 =head1 DESCRIPTION
  45
  46 Read C language source or header FILEs, extract embedded documentation comments,
  47 and print formatted documentation to standard output.
  48
  49 The documentation comments are identified by the "/**" opening comment mark.
  50
  51 See Documentation/doc-guide/kernel-doc.rst for the documentation comment syntax.
  52
  53 =cut
  54
  55 # more perldoc at the end of the file
  56
  57 ## init lots of data
  58
  59 my $errors = 0;
  60 my $warnings = 0;
  61 my $anon_struct_union = 0;
  62
  63 # match expressions used to find embedded type information
  64 my $type_constant = '\b``([^\`]+)``\b';
  65 my $type_constant2 = '\%([-_\w]+)';
  66 my $type_func = '(\w+)\(\)';
  67 my $type_param = '\@(\w*((\.\w+)|(->\w+))*(\.\.\.)?)';
  68 my $type_param_ref = '([\!~\*]?)\@(\w*((\.\w+)|(->\w+))*(\.\.\.)?)';
  69 my $type_fp_param = '\@(\w+)\(\)';  # Special RST handling for func ptr params
  70 my $type_fp_param2 = '\@(\w+->\S+)\(\)';  # Special RST handling for structs with func ptr params
  71 my $type_env = '(\$\w+)';
  72 my $type_enum = '\&(enum\s*([_\w]+))';
  73 my $type_struct = '\&(struct\s*([_\w]+))';
  74 my $type_typedef = '\&(typedef\s*([_\w]+))';
  75 my $type_union = '\&(union\s*([_\w]+))';
  76 my $type_member = '\&([_\w]+)(\.|->)([_\w]+)';
  77 my $type_fallback = '\&([_\w]+)';
  78 my $type_member_func = $type_member . '\(\)';
  79
  80 # Output conversion substitutions.
  81 #  One for each output format
  82
  83 # these are pretty rough
  84 my @highlights_man = (
  85     [$type_constant, "\$1"],
  86     [$type_constant2, "\$1"],
  87     [$type_func, "\\\\fB\$1\\\\fP"],
  88     [$type_enum, "\\\\fI\$1\\\\fP"],
  89     [$type_struct, "\\\\fI\$1\\\\fP"],
  90     [$type_typedef, "\\\\fI\$1\\\\fP"],
  91     [$type_union, "\\\\fI\$1\\\\fP"],
  92     [$type_param, "\\\\fI\$1\\\\fP"],
  93     [$type_param_ref, "\\\\fI\$1\$2\\\\fP"],
  94     [$type_member, "\\\\fI\$1\$2\$3\\\\fP"],
  95     [$type_fallback, "\\\\fI\$1\\\\fP"]
  96   );
  97 my $blankline_man = "";
  98
  99 # rst-mode
 100 my @highlights_rst = (
 101     [$type_constant, "``\$1``"],
 102     [$type_constant2, "``\$1``"],
 103
 104     # Note: need to escape () to avoid func matching later
 105     [$type_member_func, "\\:c\\:type\\:`\$1\$2\$3\\\\(\\\\) <\$1>`"],
 106     [$type_member, "\\:c\\:type\\:`\$1\$2\$3 <\$1>`"],
 107     [$type_fp_param, "**\$1\\\\(\\\\)**"],
 108     [$type_fp_param2, "**\$1\\\\(\\\\)**"],
 109     [$type_func, "\$1()"],
 110     [$type_enum, "\\:c\\:type\\:`\$1 <\$2>`"],
 111     [$type_struct, "\\:c\\:type\\:`\$1 <\$2>`"],
 112     [$type_typedef, "\\:c\\:type\\:`\$1 <\$2>`"],
 113     [$type_union, "\\:c\\:type\\:`\$1 <\$2>`"],
 114
 115     # in rst this can refer to any type
 116     [$type_fallback, "\\:c\\:type\\:`\$1`"],
 117     [$type_param_ref, "**\$1\$2**"]
 118   );
 119 my $blankline_rst = "\n";
 120
 121 # read arguments
 122 if ($#ARGV == -1) {
 123     pod2usage(
 124         -message => "No arguments!\n",
 125         -exitval => 1,
 126         -verbose => 99,
 127         -sections => 'SYNOPSIS',
 128         -output => \*STDERR,
 129       );
 130 }
 131
 132 my $kernelversion;
 133 my ($sphinx_major, $sphinx_minor, $sphinx_patch);
 134
 135 my $dohighlight = "";
 136
 137 my $verbose = 0;
 138 my $Werror = 0;
 139 my $Wreturn = 0;
 140 my $Wshort_desc = 0;
 141 my $Wcontents_before_sections = 0;
 142 my $output_mode = "rst";
 143 my $output_preformatted = 0;
 144 my $no_doc_sections = 0;
 145 my $enable_lineno = 0;
 146 my @highlights = @highlights_rst;
 147 my $blankline = $blankline_rst;
 148 my $modulename = "Kernel API";
 149
 150 use constant {
 151     OUTPUT_ALL          => 0, # output all symbols and doc sections
 152     OUTPUT_INCLUDE      => 1, # output only specified symbols
 153     OUTPUT_EXPORTED     => 2, # output exported symbols
 154     OUTPUT_INTERNAL     => 3, # output non-exported symbols
 155 };
 156 my $output_selection = OUTPUT_ALL;
 157 my $show_not_found = 0; # No longer used
 158
 159 my @export_file_list;
 160
 161 my @build_time;
 162 if (defined($ENV{'KBUILD_BUILD_TIMESTAMP'}) &&
 163     (my $seconds = `date -d"${ENV{'KBUILD_BUILD_TIMESTAMP'}}" +%s`) ne '') {
 164     @build_time = gmtime($seconds);
 165 } else {
 166     @build_time = localtime;
 167 }
 168
 169 my $man_date = ('January', 'February', 'March', 'April', 'May', 'June',
 170                 'July', 'August', 'September', 'October',
 171                 'November', 'December')[$build_time[4]] .
 172     " " . ($build_time[5]+1900);
 173
 174 # Essentially these are globals.
 175 # They probably want to be tidied up, made more localised or something.
 176 # CAVEAT EMPTOR!  Some of the others I localised may not want to be, which
 177 # could cause "use of undefined value" or other bugs.
 178 my ($function, %function_table, %parametertypes, $declaration_purpose);
 179 my %nosymbol_table = ();
 180 my $declaration_start_line;
 181 my ($type, $declaration_name, $return_type);
 182 my ($newsection, $newcontents, $prototype, $brcount, %source_map);
 183
 184 if (defined($ENV{'KBUILD_VERBOSE'}) && $ENV{'KBUILD_VERBOSE'} =~ '1') {
 185     $verbose = 1;
 186 }
 187
 188 if (defined($ENV{'KCFLAGS'})) {
 189     my $kcflags = "$ENV{'KCFLAGS'}";
 190
 191     if ($kcflags =~ /(\s|^)-Werror(\s|$)/) {
 192         $Werror = 1;
 193     }
 194 }
 195
 196 # reading this variable is for backwards compat just in case
 197 # someone was calling it with the variable from outside the
 198 # kernel's build system
 199 if (defined($ENV{'KDOC_WERROR'})) {
 200     $Werror = "$ENV{'KDOC_WERROR'}";
 201 }
 202 # other environment variables are converted to command-line
 203 # arguments in cmd_checkdoc in the build system
 204
 205 # Generated docbook code is inserted in a template at a point where
 206 # docbook v3.1 requires a non-zero sequence of RefEntry's; see:
 207 # https://www.oasis-open.org/docbook/documentation/reference/html/refentry.html
 208 # We keep track of number of generated entries and generate a dummy
 209 # if needs be to ensure the expanded template can be postprocessed
 210 # into html.
 211 my $section_counter = 0;
 212
 213 my $lineprefix="";
 214
 215 # Parser states
 216 use constant {
 217     STATE_NORMAL        => 0,        # normal code
 218     STATE_NAME          => 1,        # looking for function name
 219     STATE_BODY_MAYBE    => 2,        # body - or maybe more description
 220     STATE_BODY          => 3,        # the body of the comment
 221     STATE_BODY_WITH_BLANK_LINE => 4, # the body, which has a blank line
 222     STATE_PROTO         => 5,        # scanning prototype
 223     STATE_DOCBLOCK      => 6,        # documentation block
 224     STATE_INLINE        => 7,        # gathering doc outside main block
 225 };
 226 my $state;
 227 my $in_doc_sect;
 228 my $leading_space;
 229
 230 # Inline documentation state
 231 use constant {
 232     STATE_INLINE_NA     => 0, # not applicable ($state != STATE_INLINE)
 233     STATE_INLINE_NAME   => 1, # looking for member name (@foo:)
 234     STATE_INLINE_TEXT   => 2, # looking for member documentation
 235     STATE_INLINE_END    => 3, # done
 236     STATE_INLINE_ERROR  => 4, # error - Comment without header was found.
 237                               # Spit a warning as it's not
 238                               # proper kernel-doc and ignore the rest.
 239 };
 240 my $inline_doc_state;
 241
 242 #declaration types: can be
 243 # 'function', 'struct', 'union', 'enum', 'typedef'
 244 my $decl_type;
 245
 246 # Name of the kernel-doc identifier for non-DOC markups
 247 my $identifier;
 248
 249 my $doc_start = '^/\*\*\s*$'; # Allow whitespace at end of comment start.
 250 my $doc_end = '\*/';
 251 my $doc_com = '\s*\*\s*';
 252 my $doc_com_body = '\s*\* ?';
 253 my $doc_decl = $doc_com . '(\w+)';
 254 # @params and a strictly limited set of supported section names
 255 # Specifically:
 256 #   Match @word:
 257 #         @...:
 258 #         @{section-name}:
 259 # while trying to not match literal block starts like "example::"
 260 #
 261 my $doc_sect = $doc_com .
 262     '\s*(\@[.\w]+|\@\.\.\.|description|context|returns?|notes?|examples?)\s*:([^:].*)?$';
 263 my $doc_content = $doc_com_body . '(.*)';
 264 my $doc_block = $doc_com . 'DOC:\s*(.*)?';
 265 my $doc_inline_start = '^\s*/\*\*\s*$';
 266 my $doc_inline_sect = '\s*\*\s*(@\s*[\w][\w\.]*\s*):(.*)';
 267 my $doc_inline_end = '^\s*\*/\s*$';
 268 my $doc_inline_oneline = '^\s*/\*\*\s*(@[\w\s]+):\s*(.*)\s*\*/\s*$';
 269 my $export_symbol = '^\s*EXPORT_SYMBOL(_GPL)?\s*\(\s*(\w+)\s*\)\s*;';
 270 my $export_symbol_ns = '^\s*EXPORT_SYMBOL_NS(_GPL)?\s*\(\s*(\w+)\s*,\s*\w+\)\s*;';
 271 my $function_pointer = qr{([^\(]*\(\*)\s*\)\s*\(([^\)]*)\)};
 272 my $attribute = qr{__attribute__\s*\(\([a-z0-9,_\*\s\(\)]*\)\)}i;
 273
 274 my %parameterdescs;
 275 my %parameterdesc_start_lines;
 276 my @parameterlist;
 277 my %sections;
 278 my @sectionlist;
 279 my %section_start_lines;
 280 my $sectcheck;
 281 my $struct_actual;
 282
 283 my $contents = "";
 284 my $new_start_line = 0;
 285
 286 # the canonical section names. see also $doc_sect above.
 287 my $section_default = "Description";    # default section
 288 my $section_intro = "Introduction";
 289 my $section = $section_default;
 290 my $section_context = "Context";
 291 my $section_return = "Return";
 292
 293 my $undescribed = "-- undescribed --";
 294
 295 reset_state();
 296
 297 while ($ARGV[0] =~ m/^--?(.*)/) {
 298     my $cmd = $1;
 299     shift @ARGV;
 300     if ($cmd eq "man") {
 301         $output_mode = "man";
 302         @highlights = @highlights_man;
 303         $blankline = $blankline_man;
 304     } elsif ($cmd eq "rst") {
 305         $output_mode = "rst";
 306         @highlights = @highlights_rst;
 307         $blankline = $blankline_rst;
 308     } elsif ($cmd eq "none") {
 309         $output_mode = "none";
 310     } elsif ($cmd eq "module") { # not needed for XML, inherits from calling document
 311         $modulename = shift @ARGV;
 312     } elsif ($cmd eq "function") { # to only output specific functions
 313         $output_selection = OUTPUT_INCLUDE;
 314         $function = shift @ARGV;
 315         $function_table{$function} = 1;
 316     } elsif ($cmd eq "nosymbol") { # Exclude specific symbols
 317         my $symbol = shift @ARGV;
 318         $nosymbol_table{$symbol} = 1;
 319     } elsif ($cmd eq "export") { # only exported symbols
 320         $output_selection = OUTPUT_EXPORTED;
 321         %function_table = ();
 322     } elsif ($cmd eq "internal") { # only non-exported symbols
 323         $output_selection = OUTPUT_INTERNAL;
 324         %function_table = ();
 325     } elsif ($cmd eq "export-file") {
 326         my $file = shift @ARGV;
 327         push(@export_file_list, $file);
 328     } elsif ($cmd eq "v") {
 329         $verbose = 1;
 330     } elsif ($cmd eq "Werror") {
 331         $Werror = 1;
 332     } elsif ($cmd eq "Wreturn") {
 333         $Wreturn = 1;
 334     } elsif ($cmd eq "Wshort-desc" or $cmd eq "Wshort-description") {
 335         $Wshort_desc = 1;
 336     } elsif ($cmd eq "Wcontents-before-sections") {
 337         $Wcontents_before_sections = 1;
 338     } elsif ($cmd eq "Wall") {
 339         $Wreturn = 1;
 340         $Wshort_desc = 1;
 341         $Wcontents_before_sections = 1;
 342     } elsif (($cmd eq "h") || ($cmd eq "help")) {
 343         pod2usage(-exitval => 0, -verbose => 2);
 344     } elsif ($cmd eq 'no-doc-sections') {
 345         $no_doc_sections = 1;
 346     } elsif ($cmd eq 'enable-lineno') {
 347         $enable_lineno = 1;
 348     } elsif ($cmd eq 'show-not-found') {
 349         $show_not_found = 1;  # A no-op but don't fail
 350     } elsif ($cmd eq "sphinx-version") {
 351         my $ver_string = shift @ARGV;
 352         if ($ver_string =~ m/^(\d+)(\.\d+)?(\.\d+)?/) {
 353             $sphinx_major = $1;
 354             if (defined($2)) {
 355                 $sphinx_minor = substr($2,1);
 356             } else {
 357                 $sphinx_minor = 0;
 358             }
 359             if (defined($3)) {
 360                 $sphinx_patch = substr($3,1)
 361             } else {
 362                 $sphinx_patch = 0;
 363             }
 364         } else {
 365             die "Sphinx version should either major.minor or major.minor.patch format\n";
 366         }
 367     } else {
 368         # Unknown argument
 369         pod2usage(
 370             -message => "Argument unknown!\n",
 371             -exitval => 1,
 372             -verbose => 99,
 373             -sections => 'SYNOPSIS',
 374             -output => \*STDERR,
 375             );
 376     }
 377     if ($#ARGV < 0){
 378         pod2usage(
 379             -message => "FILE argument missing\n",
 380             -exitval => 1,
 381             -verbose => 99,
 382             -sections => 'SYNOPSIS',
 383             -output => \*STDERR,
 384             );
 385     }
 386 }
 387
 388 # continue execution near EOF;
 389
 390 # The C domain dialect changed on Sphinx 3. So, we need to check the
 391 # version in order to produce the right tags.
 392 sub findprog($)
 393 {
 394     foreach(split(/:/, $ENV{PATH})) {
 395         return "$_/$_[0]" if(-x "$_/$_[0]");
 396     }
 397 }
 398
 399 sub get_sphinx_version()
 400 {
 401     my $ver;
 402
 403     my $cmd = "sphinx-build";
 404     if (!findprog($cmd)) {
 405         my $cmd = "sphinx-build3";
 406         if (!findprog($cmd)) {
 407             $sphinx_major = 1;
 408             $sphinx_minor = 2;
 409             $sphinx_patch = 0;
 410             printf STDERR "Warning: Sphinx version not found. Using default (Sphinx version %d.%d.%d)\n",
 411                    $sphinx_major, $sphinx_minor, $sphinx_patch;
 412             return;
 413         }
 414     }
 415
 416     open IN, "$cmd --version 2>&1 |";
 417     while (<IN>) {
 418         if (m/^\s*sphinx-build\s+([\d]+)\.([\d\.]+)(\+\/[\da-f]+)?$/) {
 419             $sphinx_major = $1;
 420             $sphinx_minor = $2;
 421             $sphinx_patch = $3;
 422             last;
 423         }
 424         # Sphinx 1.2.x uses a different format
 425         if (m/^\s*Sphinx.*\s+([\d]+)\.([\d\.]+)$/) {
 426             $sphinx_major = $1;
 427             $sphinx_minor = $2;
 428             $sphinx_patch = $3;
 429             last;
 430         }
 431     }
 432     close IN;
 433 }
 434
 435 # get kernel version from env
 436 sub get_kernel_version() {
 437     my $version = 'unknown kernel version';
 438
 439     if (defined($ENV{'KERNELVERSION'})) {
 440         $version = $ENV{'KERNELVERSION'};
 441     }
 442     return $version;
 443 }
 444
 445 #
 446 sub print_lineno {
 447     my $lineno = shift;
 448     if ($enable_lineno && defined($lineno)) {
 449         print ".. LINENO " . $lineno . "\n";
 450     }
 451 }
 452
 453 sub emit_warning {
 454     my $location = shift;
 455     my $msg = shift;
 456     print STDERR "$location: warning: $msg";
 457     ++$warnings;
 458 }
 459 ##
 460 # dumps section contents to arrays/hashes intended for that purpose.
 461 #
 462 sub dump_section {
 463     my $file = shift;
 464     my $name = shift;
 465     my $contents = join "\n", @_;
 466
 467     if ($name =~ m/$type_param/) {
 468         $name = $1;
 469         $parameterdescs{$name} = $contents;
 470         $sectcheck = $sectcheck . $name . " ";
 471         $parameterdesc_start_lines{$name} = $new_start_line;
 472         $new_start_line = 0;
 473     } elsif ($name eq "@\.\.\.") {
 474         $name = "...";
 475         $parameterdescs{$name} = $contents;
 476         $sectcheck = $sectcheck . $name . " ";
 477         $parameterdesc_start_lines{$name} = $new_start_line;
 478         $new_start_line = 0;
 479     } else {
 480         if (defined($sections{$name}) && ($sections{$name} ne "")) {
 481             # Only warn on user specified duplicate section names.
 482             if ($name ne $section_default) {
 483                 emit_warning("${file}:$.", "duplicate section name '$name'\n");
 484             }
 485             $sections{$name} .= $contents;
 486         } else {
 487             $sections{$name} = $contents;
 488             push @sectionlist, $name;
 489             $section_start_lines{$name} = $new_start_line;
 490             $new_start_line = 0;
 491         }
 492     }
 493 }
 494
 495 ##
 496 # dump DOC: section after checking that it should go out
 497 #
 498 sub dump_doc_section {
 499     my $file = shift;
 500     my $name = shift;
 501     my $contents = join "\n", @_;
 502
 503     if ($no_doc_sections) {
 504         return;
 505     }
 506
 507     return if (defined($nosymbol_table{$name}));
 508
 509     if (($output_selection == OUTPUT_ALL) ||
 510         (($output_selection == OUTPUT_INCLUDE) &&
 511          defined($function_table{$name})))
 512     {
 513         dump_section($file, $name, $contents);
 514         output_blockhead({'sectionlist' => \@sectionlist,
 515                           'sections' => \%sections,
 516                           'module' => $modulename,
 517                           'content-only' => ($output_selection != OUTPUT_ALL), });
 518     }
 519 }
 520
 521 ##
 522 # output function
 523 #
 524 # parameterdescs, a hash.
 525 #  function => "function name"
 526 #  parameterlist => @list of parameters
 527 #  parameterdescs => %parameter descriptions
 528 #  sectionlist => @list of sections
 529 #  sections => %section descriptions
 530 #
 531
 532 sub output_highlight {
 533     my $contents = join "\n",@_;
 534     my $line;
 535
 536 #   DEBUG
 537 #   if (!defined $contents) {
 538 #       use Carp;
 539 #       confess "output_highlight got called with no args?\n";
 540 #   }
 541
 542 #   print STDERR "contents b4:$contents\n";
 543     eval $dohighlight;
 544     die $@ if $@;
 545 #   print STDERR "contents af:$contents\n";
 546
 547     foreach $line (split "\n", $contents) {
 548         if (! $output_preformatted) {
 549             $line =~ s/^\s*//;
 550         }
 551         if ($line eq ""){
 552             if (! $output_preformatted) {
 553                 print $lineprefix, $blankline;
 554             }
 555         } else {
 556             if ($output_mode eq "man" && substr($line, 0, 1) eq ".") {
 557                 print "\\&$line";
 558             } else {
 559                 print $lineprefix, $line;
 560             }
 561         }
 562         print "\n";
 563     }
 564 }
 565
 566 ##
 567 # output function in man
 568 sub output_function_man(%) {
 569     my %args = %{$_[0]};
 570     my ($parameter, $section);
 571     my $count;
 572
 573     print ".TH \"$args{'function'}\" 9 \"$args{'function'}\" \"$man_date\" \"Kernel Hacker's Manual\" LINUX\n";
 574
 575     print ".SH NAME\n";
 576     print $args{'function'} . " \\- " . $args{'purpose'} . "\n";
 577
 578     print ".SH SYNOPSIS\n";
 579     if ($args{'functiontype'} ne "") {
 580         print ".B \"" . $args{'functiontype'} . "\" " . $args{'function'} . "\n";
 581     } else {
 582         print ".B \"" . $args{'function'} . "\n";
 583     }
 584     $count = 0;
 585     my $parenth = "(";
 586     my $post = ",";
 587     foreach my $parameter (@{$args{'parameterlist'}}) {
 588         if ($count == $#{$args{'parameterlist'}}) {
 589             $post = ");";
 590         }
 591         $type = $args{'parametertypes'}{$parameter};
 592         if ($type =~ m/$function_pointer/) {
 593             # pointer-to-function
 594             print ".BI \"" . $parenth . $1 . "\" " . " \") (" . $2 . ")" . $post . "\"\n";
 595         } else {
 596             $type =~ s/([^\*])$/$1 /;
 597             print ".BI \"" . $parenth . $type . "\" " . " \"" . $post . "\"\n";
 598         }
 599         $count++;
 600         $parenth = "";
 601     }
 602
 603     print ".SH ARGUMENTS\n";
 604     foreach $parameter (@{$args{'parameterlist'}}) {
 605         my $parameter_name = $parameter;
 606         $parameter_name =~ s/\[.*//;
 607
 608         print ".IP \"" . $parameter . "\" 12\n";
 609         output_highlight($args{'parameterdescs'}{$parameter_name});
 610     }
 611     foreach $section (@{$args{'sectionlist'}}) {
 612         print ".SH \"", uc $section, "\"\n";
 613         output_highlight($args{'sections'}{$section});
 614     }
 615 }
 616
 617 ##
 618 # output enum in man
 619 sub output_enum_man(%) {
 620     my %args = %{$_[0]};
 621     my ($parameter, $section);
 622     my $count;
 623
 624     print ".TH \"$args{'module'}\" 9 \"enum $args{'enum'}\" \"$man_date\" \"API Manual\" LINUX\n";
 625
 626     print ".SH NAME\n";
 627     print "enum " . $args{'enum'} . " \\- " . $args{'purpose'} . "\n";
 628
 629     print ".SH SYNOPSIS\n";
 630     print "enum " . $args{'enum'} . " {\n";
 631     $count = 0;
 632     foreach my $parameter (@{$args{'parameterlist'}}) {
 633         print ".br\n.BI \"    $parameter\"\n";
 634         if ($count == $#{$args{'parameterlist'}}) {
 635             print "\n};\n";
 636             last;
 637         } else {
 638             print ", \n.br\n";
 639         }
 640         $count++;
 641     }
 642
 643     print ".SH Constants\n";
 644     foreach $parameter (@{$args{'parameterlist'}}) {
 645         my $parameter_name = $parameter;
 646         $parameter_name =~ s/\[.*//;
 647
 648         print ".IP \"" . $parameter . "\" 12\n";
 649         output_highlight($args{'parameterdescs'}{$parameter_name});
 650     }
 651     foreach $section (@{$args{'sectionlist'}}) {
 652         print ".SH \"$section\"\n";
 653         output_highlight($args{'sections'}{$section});
 654     }
 655 }
 656
 657 ##
 658 # output struct in man
 659 sub output_struct_man(%) {
 660     my %args = %{$_[0]};
 661     my ($parameter, $section);
 662
 663     print ".TH \"$args{'module'}\" 9 \"" . $args{'type'} . " " . $args{'struct'} . "\" \"$man_date\" \"API Manual\" LINUX\n";
 664
 665     print ".SH NAME\n";
 666     print $args{'type'} . " " . $args{'struct'} . " \\- " . $args{'purpose'} . "\n";
 667
 668     my $declaration = $args{'definition'};
 669     $declaration =~ s/\t/  /g;
 670     $declaration =~ s/\n/"\n.br\n.BI \"/g;
 671     print ".SH SYNOPSIS\n";
 672     print $args{'type'} . " " . $args{'struct'} . " {\n.br\n";
 673     print ".BI \"$declaration\n};\n.br\n\n";
 674
 675     print ".SH Members\n";
 676     foreach $parameter (@{$args{'parameterlist'}}) {
 677         ($parameter =~ /^#/) && next;
 678
 679         my $parameter_name = $parameter;
 680         $parameter_name =~ s/\[.*//;
 681
 682         ($args{'parameterdescs'}{$parameter_name} ne $undescribed) || next;
 683         print ".IP \"" . $parameter . "\" 12\n";
 684         output_highlight($args{'parameterdescs'}{$parameter_name});
 685     }
 686     foreach $section (@{$args{'sectionlist'}}) {
 687         print ".SH \"$section\"\n";
 688         output_highlight($args{'sections'}{$section});
 689     }
 690 }
 691
 692 ##
 693 # output typedef in man
 694 sub output_typedef_man(%) {
 695     my %args = %{$_[0]};
 696     my ($parameter, $section);
 697
 698     print ".TH \"$args{'module'}\" 9 \"$args{'typedef'}\" \"$man_date\" \"API Manual\" LINUX\n";
 699
 700     print ".SH NAME\n";
 701     print "typedef " . $args{'typedef'} . " \\- " . $args{'purpose'} . "\n";
 702
 703     foreach $section (@{$args{'sectionlist'}}) {
 704         print ".SH \"$section\"\n";
 705         output_highlight($args{'sections'}{$section});
 706     }
 707 }
 708
 709 sub output_blockhead_man(%) {
 710     my %args = %{$_[0]};
 711     my ($parameter, $section);
 712     my $count;
 713
 714     print ".TH \"$args{'module'}\" 9 \"$args{'module'}\" \"$man_date\" \"API Manual\" LINUX\n";
 715
 716     foreach $section (@{$args{'sectionlist'}}) {
 717         print ".SH \"$section\"\n";
 718         output_highlight($args{'sections'}{$section});
 719     }
 720 }
 721
 722 ##
 723 # output in restructured text
 724 #
 725
 726 #
 727 # This could use some work; it's used to output the DOC: sections, and
 728 # starts by putting out the name of the doc section itself, but that tends
 729 # to duplicate a header already in the template file.
 730 #
 731 sub output_blockhead_rst(%) {
 732     my %args = %{$_[0]};
 733     my ($parameter, $section);
 734
 735     foreach $section (@{$args{'sectionlist'}}) {
 736         next if (defined($nosymbol_table{$section}));
 737
 738         if ($output_selection != OUTPUT_INCLUDE) {
 739             print ".. _$section:\n\n";
 740             print "**$section**\n\n";
 741         }
 742         print_lineno($section_start_lines{$section});
 743         output_highlight_rst($args{'sections'}{$section});
 744         print "\n";
 745     }
 746 }
 747
 748 #
 749 # Apply the RST highlights to a sub-block of text.
 750 #
 751 sub highlight_block($) {
 752     # The dohighlight kludge requires the text be called $contents
 753     my $contents = shift;
 754     eval $dohighlight;
 755     die $@ if $@;
 756     return $contents;
 757 }
 758
 759 #
 760 # Regexes used only here.
 761 #
 762 my $sphinx_literal = '^[^.].*::$';
 763 my $sphinx_cblock = '^\.\.\ +code-block::';
 764
 765 sub output_highlight_rst {
 766     my $input = join "\n",@_;
 767     my $output = "";
 768     my $line;
 769     my $in_literal = 0;
 770     my $litprefix;
 771     my $block = "";
 772
 773     foreach $line (split "\n",$input) {
 774         #
 775         # If we're in a literal block, see if we should drop out
 776         # of it.  Otherwise pass the line straight through unmunged.
 777         #
 778         if ($in_literal) {
 779             if (! ($line =~ /^\s*$/)) {
 780                 #
 781                 # If this is the first non-blank line in a literal
 782                 # block we need to figure out what the proper indent is.
 783                 #
 784                 if ($litprefix eq "") {
 785                     $line =~ /^(\s*)/;
 786                     $litprefix = '^' . $1;
 787                     $output .= $line . "\n";
 788                 } elsif (! ($line =~ /$litprefix/)) {
 789                     $in_literal = 0;
 790                 } else {
 791                     $output .= $line . "\n";
 792                 }
 793             } else {
 794                 $output .= $line . "\n";
 795             }
 796         }
 797         #
 798         # Not in a literal block (or just dropped out)
 799         #
 800         if (! $in_literal) {
 801             $block .= $line . "\n";
 802             if (($line =~ /$sphinx_literal/) || ($line =~ /$sphinx_cblock/)) {
 803                 $in_literal = 1;
 804                 $litprefix = "";
 805                 $output .= highlight_block($block);
 806                 $block = ""
 807             }
 808         }
 809     }
 810
 811     if ($block) {
 812         $output .= highlight_block($block);
 813     }
 814     foreach $line (split "\n", $output) {
 815         print $lineprefix . $line . "\n";
 816     }
 817 }
 818
 819 sub output_function_rst(%) {
 820     my %args = %{$_[0]};
 821     my ($parameter, $section);
 822     my $oldprefix = $lineprefix;
 823
 824     my $signature = "";
 825     if ($args{'functiontype'} ne "") {
 826         $signature = $args{'functiontype'} . " " . $args{'function'} . " (";
 827     } else {
 828         $signature = $args{'function'} . " (";
 829     }
 830
 831     my $count = 0;
 832     foreach my $parameter (@{$args{'parameterlist'}}) {
 833         if ($count ne 0) {
 834             $signature .= ", ";
 835         }
 836         $count++;
 837         $type = $args{'parametertypes'}{$parameter};
 838
 839         if ($type =~ m/$function_pointer/) {
 840             # pointer-to-function
 841             $signature .= $1 . $parameter . ") (" . $2 . ")";
 842         } else {
 843             $signature .= $type;
 844         }
 845     }
 846
 847     $signature .= ")";
 848
 849     if ($sphinx_major < 3) {
 850         if ($args{'typedef'}) {
 851             print ".. c:type:: ". $args{'function'} . "\n\n";
 852             print_lineno($declaration_start_line);
 853             print "   **Typedef**: ";
 854             $lineprefix = "";
 855             output_highlight_rst($args{'purpose'});
 856             print "\n\n**Syntax**\n\n";
 857             print "  ``$signature``\n\n";
 858         } else {
 859             print ".. c:function:: $signature\n\n";
 860         }
 861     } else {
 862         if ($args{'typedef'} || $args{'functiontype'} eq "") {
 863             print ".. c:macro:: ". $args{'function'} . "\n\n";
 864
 865             if ($args{'typedef'}) {
 866                 print_lineno($declaration_start_line);
 867                 print "   **Typedef**: ";
 868                 $lineprefix = "";
 869                 output_highlight_rst($args{'purpose'});
 870                 print "\n\n**Syntax**\n\n";
 871                 print "  ``$signature``\n\n";
 872             } else {
 873                 print "``$signature``\n\n";
 874             }
 875         } else {
 876             print ".. c:function:: $signature\n\n";
 877         }
 878     }
 879
 880     if (!$args{'typedef'}) {
 881         print_lineno($declaration_start_line);
 882         $lineprefix = "   ";
 883         output_highlight_rst($args{'purpose'});
 884         print "\n";
 885     }
 886
 887     #
 888     # Put our descriptive text into a container (thus an HTML <div>) to help
 889     # set the function prototypes apart.
 890     #
 891     print ".. container:: kernelindent\n\n";
 892     $lineprefix = "  ";
 893     print $lineprefix . "**Parameters**\n\n";
 894     foreach $parameter (@{$args{'parameterlist'}}) {
 895         my $parameter_name = $parameter;
 896         $parameter_name =~ s/\[.*//;
 897         $type = $args{'parametertypes'}{$parameter};
 898
 899         if ($type ne "") {
 900             print $lineprefix . "``$type``\n";
 901         } else {
 902             print $lineprefix . "``$parameter``\n";
 903         }
 904
 905         print_lineno($parameterdesc_start_lines{$parameter_name});
 906
 907         $lineprefix = "    ";
 908         if (defined($args{'parameterdescs'}{$parameter_name}) &&
 909             $args{'parameterdescs'}{$parameter_name} ne $undescribed) {
 910             output_highlight_rst($args{'parameterdescs'}{$parameter_name});
 911         } else {
 912             print $lineprefix . "*undescribed*\n";
 913         }
 914         $lineprefix = "  ";
 915         print "\n";
 916     }
 917
 918     output_section_rst(@_);
 919     $lineprefix = $oldprefix;
 920 }
 921
 922 sub output_section_rst(%) {
 923     my %args = %{$_[0]};
 924     my $section;
 925     my $oldprefix = $lineprefix;
 926
 927     foreach $section (@{$args{'sectionlist'}}) {
 928         print $lineprefix . "**$section**\n\n";
 929         print_lineno($section_start_lines{$section});
 930         output_highlight_rst($args{'sections'}{$section});
 931         print "\n";
 932     }
 933     print "\n";
 934 }
 935
 936 sub output_enum_rst(%) {
 937     my %args = %{$_[0]};
 938     my ($parameter);
 939     my $oldprefix = $lineprefix;
 940     my $count;
 941     my $outer;
 942
 943     if ($sphinx_major < 3) {
 944         my $name = "enum " . $args{'enum'};
 945         print "\n\n.. c:type:: " . $name . "\n\n";
 946     } else {
 947         my $name = $args{'enum'};
 948         print "\n\n.. c:enum:: " . $name . "\n\n";
 949     }
 950     print_lineno($declaration_start_line);
 951     $lineprefix = "  ";
 952     output_highlight_rst($args{'purpose'});
 953     print "\n";
 954
 955     print ".. container:: kernelindent\n\n";
 956     $outer = $lineprefix . "  ";
 957     $lineprefix = $outer . "  ";
 958     print $outer . "**Constants**\n\n";
 959     foreach $parameter (@{$args{'parameterlist'}}) {
 960         print $outer . "``$parameter``\n";
 961
 962         if ($args{'parameterdescs'}{$parameter} ne $undescribed) {
 963             output_highlight_rst($args{'parameterdescs'}{$parameter});
 964         } else {
 965             print $lineprefix . "*undescribed*\n";
 966         }
 967         print "\n";
 968     }
 969     print "\n";
 970     $lineprefix = $oldprefix;
 971     output_section_rst(@_);
 972 }
 973
 974 sub output_typedef_rst(%) {
 975     my %args = %{$_[0]};
 976     my ($parameter);
 977     my $oldprefix = $lineprefix;
 978     my $name;
 979
 980     if ($sphinx_major < 3) {
 981         $name = "typedef " . $args{'typedef'};
 982     } else {
 983         $name = $args{'typedef'};
 984     }
 985     print "\n\n.. c:type:: " . $name . "\n\n";
 986     print_lineno($declaration_start_line);
 987     $lineprefix = "   ";
 988     output_highlight_rst($args{'purpose'});
 989     print "\n";
 990
 991     $lineprefix = $oldprefix;
 992     output_section_rst(@_);
 993 }
 994
 995 sub output_struct_rst(%) {
 996     my %args = %{$_[0]};
 997     my ($parameter);
 998     my $oldprefix = $lineprefix;
 999
1000     if ($sphinx_major < 3) {
1001         my $name = $args{'type'} . " " . $args{'struct'};
1002         print "\n\n.. c:type:: " . $name . "\n\n";
1003     } else {
1004         my $name = $args{'struct'};
1005         if ($args{'type'} eq 'union') {
1006             print "\n\n.. c:union:: " . $name . "\n\n";
1007         } else {
1008             print "\n\n.. c:struct:: " . $name . "\n\n";
1009         }
1010     }
1011     print_lineno($declaration_start_line);
1012     $lineprefix = "  ";
1013     output_highlight_rst($args{'purpose'});
1014     print "\n";
1015
1016     print ".. container:: kernelindent\n\n";
1017     print $lineprefix . "**Definition**::\n\n";
1018     my $declaration = $args{'definition'};
1019     $lineprefix = $lineprefix . "  ";
1020     $declaration =~ s/\t/$lineprefix/g;
1021     print $lineprefix . $args{'type'} . " " . $args{'struct'} . " {\n$declaration" . $lineprefix . "};\n\n";
1022
1023     $lineprefix = "  ";
1024     print $lineprefix . "**Members**\n\n";
1025     foreach $parameter (@{$args{'parameterlist'}}) {
1026         ($parameter =~ /^#/) && next;
1027
1028         my $parameter_name = $parameter;
1029         $parameter_name =~ s/\[.*//;
1030
1031         ($args{'parameterdescs'}{$parameter_name} ne $undescribed) || next;
1032         $type = $args{'parametertypes'}{$parameter};
1033         print_lineno($parameterdesc_start_lines{$parameter_name});
1034         print $lineprefix . "``" . $parameter . "``\n";
1035         $lineprefix = "    ";
1036         output_highlight_rst($args{'parameterdescs'}{$parameter_name});
1037         $lineprefix = "  ";
1038         print "\n";
1039     }
1040     print "\n";
1041
1042     $lineprefix = $oldprefix;
1043     output_section_rst(@_);
1044 }
1045
1046 ## none mode output functions
1047
1048 sub output_function_none(%) {
1049 }
1050
1051 sub output_enum_none(%) {
1052 }
1053
1054 sub output_typedef_none(%) {
1055 }
1056
1057 sub output_struct_none(%) {
1058 }
1059
1060 sub output_blockhead_none(%) {
1061 }
1062
1063 ##
1064 # generic output function for all types (function, struct/union, typedef, enum);
1065 # calls the generated, variable output_ function name based on
1066 # functype and output_mode
1067 sub output_declaration {
1068     no strict 'refs';
1069     my $name = shift;
1070     my $functype = shift;
1071     my $func = "output_${functype}_$output_mode";
1072
1073     return if (defined($nosymbol_table{$name}));
1074
1075     if (($output_selection == OUTPUT_ALL) ||
1076         (($output_selection == OUTPUT_INCLUDE ||
1077           $output_selection == OUTPUT_EXPORTED) &&
1078          defined($function_table{$name})) ||
1079         ($output_selection == OUTPUT_INTERNAL &&
1080          !($functype eq "function" && defined($function_table{$name}))))
1081     {
1082         &$func(@_);
1083         $section_counter++;
1084     }
1085 }
1086
1087 ##
1088 # generic output function - calls the right one based on current output mode.
1089 sub output_blockhead {
1090     no strict 'refs';
1091     my $func = "output_blockhead_" . $output_mode;
1092     &$func(@_);
1093     $section_counter++;
1094 }
1095
1096 ##
1097 # takes a declaration (struct, union, enum, typedef) and
1098 # invokes the right handler. NOT called for functions.
1099 sub dump_declaration($$) {
1100     no strict 'refs';
1101     my ($prototype, $file) = @_;
1102     my $func = "dump_" . $decl_type;
1103     &$func(@_);
1104 }
1105
1106 sub dump_union($$) {
1107     dump_struct(@_);
1108 }
1109
1110 sub dump_struct($$) {
1111     my $x = shift;
1112     my $file = shift;
1113     my $decl_type;
1114     my $members;
1115     my $type = qr{struct|union};
1116     # For capturing struct/union definition body, i.e. "{members*}qualifiers*"
1117     my $qualifiers = qr{$attribute|__packed|__aligned|____cacheline_aligned_in_smp|____cacheline_aligned};
1118     my $definition_body = qr{\{(.*)\}\s*$qualifiers*};
1119     my $struct_members = qr{($type)([^\{\};]+)\{([^\{\}]*)\}([^\{\}\;]*)\;};
1120
1121     if ($x =~ /($type)\s+(\w+)\s*$definition_body/) {
1122         $decl_type = $1;
1123         $declaration_name = $2;
1124         $members = $3;
1125     } elsif ($x =~ /typedef\s+($type)\s*$definition_body\s*(\w+)\s*;/) {
1126         $decl_type = $1;
1127         $declaration_name = $3;
1128         $members = $2;
1129     }
1130
1131     if ($members) {
1132         if ($identifier ne $declaration_name) {
1133             emit_warning("${file}:$.", "expecting prototype for $decl_type $identifier. Prototype was for $decl_type $declaration_name instead\n");
1134             return;
1135         }
1136
1137         # ignore members marked private:
1138         $members =~ s/\/\*\s*private:.*?\/\*\s*public:.*?\*\///gosi;
1139         $members =~ s/\/\*\s*private:.*//gosi;
1140         # strip comments:
1141         $members =~ s/\/\*.*?\*\///gos;
1142         # strip attributes
1143         $members =~ s/\s*$attribute/ /gi;
1144         $members =~ s/\s*__aligned\s*\([^;]*\)/ /gos;
1145         $members =~ s/\s*__counted_by\s*\([^;]*\)/ /gos;
1146         $members =~ s/\s*__packed\s*/ /gos;
1147         $members =~ s/\s*CRYPTO_MINALIGN_ATTR/ /gos;
1148         $members =~ s/\s*____cacheline_aligned_in_smp/ /gos;
1149         $members =~ s/\s*____cacheline_aligned/ /gos;
1150         # unwrap struct_group():
1151         # - first eat non-declaration parameters and rewrite for final match
1152         # - then remove macro, outer parens, and trailing semicolon
1153         $members =~ s/\bstruct_group\s*\(([^,]*,)/STRUCT_GROUP(/gos;
1154         $members =~ s/\bstruct_group_(attr|tagged)\s*\(([^,]*,){2}/STRUCT_GROUP(/gos;
1155         $members =~ s/\b__struct_group\s*\(([^,]*,){3}/STRUCT_GROUP(/gos;
1156         $members =~ s/\bSTRUCT_GROUP(\(((?:(?>[^)(]+)|(?1))*)\))[^;]*;/$2/gos;
1157
1158         my $args = qr{([^,)]+)};
1159         # replace DECLARE_BITMAP
1160         $members =~ s/__ETHTOOL_DECLARE_LINK_MODE_MASK\s*\(([^\)]+)\)/DECLARE_BITMAP($1, __ETHTOOL_LINK_MODE_MASK_NBITS)/gos;
1161         $members =~ s/DECLARE_PHY_INTERFACE_MASK\s*\(([^\)]+)\)/DECLARE_BITMAP($1, PHY_INTERFACE_MODE_MAX)/gos;
1162         $members =~ s/DECLARE_BITMAP\s*\($args,\s*$args\)/unsigned long $1\[BITS_TO_LONGS($2)\]/gos;
1163         # replace DECLARE_HASHTABLE
1164         $members =~ s/DECLARE_HASHTABLE\s*\($args,\s*$args\)/unsigned long $1\[1 << (($2) - 1)\]/gos;
1165         # replace DECLARE_KFIFO
1166         $members =~ s/DECLARE_KFIFO\s*\($args,\s*$args,\s*$args\)/$2 \*$1/gos;
1167         # replace DECLARE_KFIFO_PTR
1168         $members =~ s/DECLARE_KFIFO_PTR\s*\($args,\s*$args\)/$2 \*$1/gos;
1169         # replace DECLARE_FLEX_ARRAY
1170         $members =~ s/(?:__)?DECLARE_FLEX_ARRAY\s*\($args,\s*$args\)/$1 $2\[\]/gos;
1171         #replace DEFINE_DMA_UNMAP_ADDR
1172         $members =~ s/DEFINE_DMA_UNMAP_ADDR\s*\($args\)/dma_addr_t $1/gos;
1173         #replace DEFINE_DMA_UNMAP_LEN
1174         $members =~ s/DEFINE_DMA_UNMAP_LEN\s*\($args\)/__u32 $1/gos;
1175         my $declaration = $members;
1176
1177         # Split nested struct/union elements as newer ones
1178         while ($members =~ m/$struct_members/) {
1179             my $newmember;
1180             my $maintype = $1;
1181             my $ids = $4;
1182             my $content = $3;
1183             foreach my $id(split /,/, $ids) {
1184                 $newmember .= "$maintype $id; ";
1185
1186                 $id =~ s/[:\[].*//;
1187                 $id =~ s/^\s*\**(\S+)\s*/$1/;
1188                 foreach my $arg (split /;/, $content) {
1189                     next if ($arg =~ m/^\s*$/);
1190                     if ($arg =~ m/^([^\(]+\(\*?\s*)([\w\.]*)(\s*\).*)/) {
1191                         # pointer-to-function
1192                         my $type = $1;
1193                         my $name = $2;
1194                         my $extra = $3;
1195                         next if (!$name);
1196                         if ($id =~ m/^\s*$/) {
1197                             # anonymous struct/union
1198                             $newmember .= "$type$name$extra; ";
1199                         } else {
1200                             $newmember .= "$type$id.$name$extra; ";
1201                         }
1202                     } else {
1203                         my $type;
1204                         my $names;
1205                         $arg =~ s/^\s+//;
1206                         $arg =~ s/\s+$//;
1207                         # Handle bitmaps
1208                         $arg =~ s/:\s*\d+\s*//g;
1209                         # Handle arrays
1210                         $arg =~ s/\[.*\]//g;
1211                         # The type may have multiple words,
1212                         # and multiple IDs can be defined, like:
1213                         #    const struct foo, *bar, foobar
1214                         # So, we remove spaces when parsing the
1215                         # names, in order to match just names
1216                         # and commas for the names
1217                         $arg =~ s/\s*,\s*/,/g;
1218                         if ($arg =~ m/(.*)\s+([\S+,]+)/) {
1219                             $type = $1;
1220                             $names = $2;
1221                         } else {
1222                             $newmember .= "$arg; ";
1223                             next;
1224                         }
1225                         foreach my $name (split /,/, $names) {
1226                             $name =~ s/^\s*\**(\S+)\s*/$1/;
1227                             next if (($name =~ m/^\s*$/));
1228                             if ($id =~ m/^\s*$/) {
1229                                 # anonymous struct/union
1230                                 $newmember .= "$type $name; ";
1231                             } else {
1232                                 $newmember .= "$type $id.$name; ";
1233                             }
1234                         }
1235                     }
1236                 }
1237             }
1238             $members =~ s/$struct_members/$newmember/;
1239         }
1240
1241         # Ignore other nested elements, like enums
1242         $members =~ s/(\{[^\{\}]*\})//g;
1243
1244         create_parameterlist($members, ';', $file, $declaration_name);
1245         check_sections($file, $declaration_name, $decl_type, $sectcheck, $struct_actual);
1246
1247         # Adjust declaration for better display
1248         $declaration =~ s/([\{;])/$1\n/g;
1249         $declaration =~ s/\}\s+;/};/g;
1250         # Better handle inlined enums
1251         do {} while ($declaration =~ s/(enum\s+\{[^\}]+),([^\n])/$1,\n$2/);
1252
1253         my @def_args = split /\n/, $declaration;
1254         my $level = 1;
1255         $declaration = "";
1256         foreach my $clause (@def_args) {
1257             $clause =~ s/^\s+//;
1258             $clause =~ s/\s+$//;
1259             $clause =~ s/\s+/ /;
1260             next if (!$clause);
1261             $level-- if ($clause =~ m/(\})/ && $level > 1);
1262             if (!($clause =~ m/^\s*#/)) {
1263                 $declaration .= "\t" x $level;
1264             }
1265             $declaration .= "\t" . $clause . "\n";
1266             $level++ if ($clause =~ m/(\{)/ && !($clause =~m/\}/));
1267         }
1268         output_declaration($declaration_name,
1269                    'struct',
1270                    {'struct' => $declaration_name,
1271                     'module' => $modulename,
1272                     'definition' => $declaration,
1273                     'parameterlist' => \@parameterlist,
1274                     'parameterdescs' => \%parameterdescs,
1275                     'parametertypes' => \%parametertypes,
1276                     'sectionlist' => \@sectionlist,
1277                     'sections' => \%sections,
1278                     'purpose' => $declaration_purpose,
1279                     'type' => $decl_type
1280                    });
1281     } else {
1282         print STDERR "${file}:$.: error: Cannot parse struct or union!\n";
1283         ++$errors;
1284     }
1285 }
1286
1287
1288 sub show_warnings($$) {
1289     my $functype = shift;
1290     my $name = shift;
1291
1292     return 0 if (defined($nosymbol_table{$name}));
1293
1294     return 1 if ($output_selection == OUTPUT_ALL);
1295
1296     if ($output_selection == OUTPUT_EXPORTED) {
1297         if (defined($function_table{$name})) {
1298             return 1;
1299         } else {
1300             return 0;
1301         }
1302     }
1303     if ($output_selection == OUTPUT_INTERNAL) {
1304         if (!($functype eq "function" && defined($function_table{$name}))) {
1305             return 1;
1306         } else {
1307             return 0;
1308         }
1309     }
1310     if ($output_selection == OUTPUT_INCLUDE) {
1311         if (defined($function_table{$name})) {
1312             return 1;
1313         } else {
1314             return 0;
1315         }
1316     }
1317     die("Please add the new output type at show_warnings()");
1318 }
1319
1320 sub dump_enum($$) {
1321     my $x = shift;
1322     my $file = shift;
1323     my $members;
1324
1325     # ignore members marked private:
1326     $x =~ s/\/\*\s*private:.*?\/\*\s*public:.*?\*\///gosi;
1327     $x =~ s/\/\*\s*private:.*}/}/gosi;
1328
1329     $x =~ s@/\*.*?\*/@@gos;     # strip comments.
1330     # strip #define macros inside enums
1331     $x =~ s@#\s*((define|ifdef|if)\s+|endif)[^;]*;@@gos;
1332
1333     if ($x =~ /typedef\s+enum\s*\{(.*)\}\s*(\w*)\s*;/) {
1334         $declaration_name = $2;
1335         $members = $1;
1336     } elsif ($x =~ /enum\s+(\w*)\s*\{(.*)\}/) {
1337         $declaration_name = $1;
1338         $members = $2;
1339     }
1340
1341     if ($members) {
1342         if ($identifier ne $declaration_name) {
1343             if ($identifier eq "") {
1344                 emit_warning("${file}:$.", "wrong kernel-doc identifier on line:\n");
1345             } else {
1346                 emit_warning("${file}:$.", "expecting prototype for enum $identifier. Prototype was for enum $declaration_name instead\n");
1347             }
1348             return;
1349         }
1350         $declaration_name = "(anonymous)" if ($declaration_name eq "");
1351
1352         my %_members;
1353
1354         $members =~ s/\s+$//;
1355         $members =~ s/\([^;]*?[\)]//g;
1356
1357         foreach my $arg (split ',', $members) {
1358             $arg =~ s/^\s*(\w+).*/$1/;
1359             push @parameterlist, $arg;
1360             if (!$parameterdescs{$arg}) {
1361                 $parameterdescs{$arg} = $undescribed;
1362                 if (show_warnings("enum", $declaration_name)) {
1363                     emit_warning("${file}:$.", "Enum value '$arg' not described in enum '$declaration_name'\n");
1364                 }
1365             }
1366             $_members{$arg} = 1;
1367         }
1368
1369         while (my ($k, $v) = each %parameterdescs) {
1370             if (!exists($_members{$k})) {
1371                 if (show_warnings("enum", $declaration_name)) {
1372                     emit_warning("${file}:$.", "Excess enum value '$k' description in '$declaration_name'\n");
1373                 }
1374             }
1375         }
1376
1377         output_declaration($declaration_name,
1378                            'enum',
1379                            {'enum' => $declaration_name,
1380                             'module' => $modulename,
1381                             'parameterlist' => \@parameterlist,
1382                             'parameterdescs' => \%parameterdescs,
1383                             'sectionlist' => \@sectionlist,
1384                             'sections' => \%sections,
1385                             'purpose' => $declaration_purpose
1386                            });
1387     } else {
1388         print STDERR "${file}:$.: error: Cannot parse enum!\n";
1389         ++$errors;
1390     }
1391 }
1392
1393 my $typedef_type = qr { ((?:\s+[\w\*]+\b){1,8})\s* }x;
1394 my $typedef_ident = qr { \*?\s*(\w\S+)\s* }x;
1395 my $typedef_args = qr { \s*\((.*)\); }x;
1396
1397 my $typedef1 = qr { typedef$typedef_type\($typedef_ident\)$typedef_args }x;
1398 my $typedef2 = qr { typedef$typedef_type$typedef_ident$typedef_args }x;
1399
1400 sub dump_typedef($$) {
1401     my $x = shift;
1402     my $file = shift;
1403
1404     $x =~ s@/\*.*?\*/@@gos;     # strip comments.
1405
1406     # Parse function typedef prototypes
1407     if ($x =~ $typedef1 || $x =~ $typedef2) {
1408         $return_type = $1;
1409         $declaration_name = $2;
1410         my $args = $3;
1411         $return_type =~ s/^\s+//;
1412
1413         if ($identifier ne $declaration_name) {
1414             emit_warning("${file}:$.", "expecting prototype for typedef $identifier. Prototype was for typedef $declaration_name instead\n");
1415             return;
1416         }
1417
1418         create_parameterlist($args, ',', $file, $declaration_name);
1419
1420         output_declaration($declaration_name,
1421                            'function',
1422                            {'function' => $declaration_name,
1423                             'typedef' => 1,
1424                             'module' => $modulename,
1425                             'functiontype' => $return_type,
1426                             'parameterlist' => \@parameterlist,
1427                             'parameterdescs' => \%parameterdescs,
1428                             'parametertypes' => \%parametertypes,
1429                             'sectionlist' => \@sectionlist,
1430                             'sections' => \%sections,
1431                             'purpose' => $declaration_purpose
1432                            });
1433         return;
1434     }
1435
1436     while (($x =~ /\(*.\)\s*;$/) || ($x =~ /\[*.\]\s*;$/)) {
1437         $x =~ s/\(*.\)\s*;$/;/;
1438         $x =~ s/\[*.\]\s*;$/;/;
1439     }
1440
1441     if ($x =~ /typedef.*\s+(\w+)\s*;/) {
1442         $declaration_name = $1;
1443
1444         if ($identifier ne $declaration_name) {
1445             emit_warning("${file}:$.", "expecting prototype for typedef $identifier. Prototype was for typedef $declaration_name instead\n");
1446             return;
1447         }
1448
1449         output_declaration($declaration_name,
1450                            'typedef',
1451                            {'typedef' => $declaration_name,
1452                             'module' => $modulename,
1453                             'sectionlist' => \@sectionlist,
1454                             'sections' => \%sections,
1455                             'purpose' => $declaration_purpose
1456                            });
1457     } else {
1458         print STDERR "${file}:$.: error: Cannot parse typedef!\n";
1459         ++$errors;
1460     }
1461 }
1462
1463 sub save_struct_actual($) {
1464     my $actual = shift;
1465
1466     # strip all spaces from the actual param so that it looks like one string item
1467     $actual =~ s/\s*//g;
1468     $struct_actual = $struct_actual . $actual . " ";
1469 }
1470
1471 sub create_parameterlist($$$$) {
1472     my $args = shift;
1473     my $splitter = shift;
1474     my $file = shift;
1475     my $declaration_name = shift;
1476     my $type;
1477     my $param;
1478
1479     # temporarily replace commas inside function pointer definition
1480     my $arg_expr = qr{\([^\),]+};
1481     while ($args =~ /$arg_expr,/) {
1482         $args =~ s/($arg_expr),/$1#/g;
1483     }
1484
1485     foreach my $arg (split($splitter, $args)) {
1486         # strip comments
1487         $arg =~ s/\/\*.*\*\///;
1488         # ignore argument attributes
1489         $arg =~ s/\sPOS0?\s/ /;
1490         # strip leading/trailing spaces
1491         $arg =~ s/^\s*//;
1492         $arg =~ s/\s*$//;
1493         $arg =~ s/\s+/ /;
1494
1495         if ($arg =~ /^#/) {
1496             # Treat preprocessor directive as a typeless variable just to fill
1497             # corresponding data structures "correctly". Catch it later in
1498             # output_* subs.
1499             push_parameter($arg, "", "", $file);
1500         } elsif ($arg =~ m/\(.+\)\s*\(/) {
1501             # pointer-to-function
1502             $arg =~ tr/#/,/;
1503             $arg =~ m/[^\(]+\(\*?\s*([\w\[\]\.]*)\s*\)/;
1504             $param = $1;
1505             $type = $arg;
1506             $type =~ s/([^\(]+\(\*?)\s*$param/$1/;
1507             save_struct_actual($param);
1508             push_parameter($param, $type, $arg, $file, $declaration_name);
1509         } elsif ($arg =~ m/\(.+\)\s*\[/) {
1510             # array-of-pointers
1511             $arg =~ tr/#/,/;
1512             $arg =~ m/[^\(]+\(\s*\*\s*([\w\[\]\.]*?)\s*(\s*\[\s*[\w]+\s*\]\s*)*\)/;
1513             $param = $1;
1514             $type = $arg;
1515             $type =~ s/([^\(]+\(\*?)\s*$param/$1/;
1516             save_struct_actual($param);
1517             push_parameter($param, $type, $arg, $file, $declaration_name);
1518         } elsif ($arg) {
1519             $arg =~ s/\s*:\s*/:/g;
1520             $arg =~ s/\s*\[/\[/g;
1521
1522             my @args = split('\s*,\s*', $arg);
1523             if ($args[0] =~ m/\*/) {
1524                 $args[0] =~ s/(\*+)\s*/ $1/;
1525             }
1526
1527             my @first_arg;
1528             if ($args[0] =~ /^(.*\s+)(.*?\[.*\].*)$/) {
1529                 shift @args;
1530                 push(@first_arg, split('\s+', $1));
1531                 push(@first_arg, $2);
1532             } else {
1533                 @first_arg = split('\s+', shift @args);
1534             }
1535
1536             unshift(@args, pop @first_arg);
1537             $type = join " ", @first_arg;
1538
1539             foreach $param (@args) {
1540                 if ($param =~ m/^(\*+)\s*(.*)/) {
1541                     save_struct_actual($2);
1542
1543                     push_parameter($2, "$type $1", $arg, $file, $declaration_name);
1544                 } elsif ($param =~ m/(.*?):(\w+)/) {
1545                     if ($type ne "") { # skip unnamed bit-fields
1546                         save_struct_actual($1);
1547                         push_parameter($1, "$type:$2", $arg, $file, $declaration_name)
1548                     }
1549                 } else {
1550                     save_struct_actual($param);
1551                     push_parameter($param, $type, $arg, $file, $declaration_name);
1552                 }
1553             }
1554         }
1555     }
1556 }
1557
1558 sub push_parameter($$$$$) {
1559     my $param = shift;
1560     my $type = shift;
1561     my $org_arg = shift;
1562     my $file = shift;
1563     my $declaration_name = shift;
1564
1565     if (($anon_struct_union == 1) && ($type eq "") &&
1566         ($param eq "}")) {
1567         return;        # ignore the ending }; from anon. struct/union
1568     }
1569
1570     $anon_struct_union = 0;
1571     $param =~ s/[\[\)].*//;
1572
1573     if ($type eq "" && $param =~ /\.\.\.$/)
1574     {
1575         if (!$param =~ /\w\.\.\.$/) {
1576             # handles unnamed variable parameters
1577             $param = "...";
1578         } elsif ($param =~ /\w\.\.\.$/) {
1579             # for named variable parameters of the form `x...`, remove the dots
1580             $param =~ s/\.\.\.$//;
1581         }
1582         if (!defined $parameterdescs{$param} || $parameterdescs{$param} eq "") {
1583             $parameterdescs{$param} = "variable arguments";
1584         }
1585     }
1586     elsif ($type eq "" && ($param eq "" or $param eq "void"))
1587     {
1588         $param="void";
1589         $parameterdescs{void} = "no arguments";
1590     }
1591     elsif ($type eq "" && ($param eq "struct" or $param eq "union"))
1592     # handle unnamed (anonymous) union or struct:
1593     {
1594         $type = $param;
1595         $param = "{unnamed_" . $param . "}";
1596         $parameterdescs{$param} = "anonymous\n";
1597         $anon_struct_union = 1;
1598     }
1599     elsif ($param =~ "__cacheline_group" )
1600     # handle cache group enforcing variables: they do not need be described in header files
1601     {
1602         return; # ignore __cacheline_group_begin and __cacheline_group_end
1603     }
1604
1605     # warn if parameter has no description
1606     # (but ignore ones starting with # as these are not parameters
1607     # but inline preprocessor statements);
1608     # Note: It will also ignore void params and unnamed structs/unions
1609     if (!defined $parameterdescs{$param} && $param !~ /^#/) {
1610         $parameterdescs{$param} = $undescribed;
1611
1612         if (show_warnings($type, $declaration_name) && $param !~ /\./) {
1613             emit_warning("${file}:$.", "Function parameter or struct member '$param' not described in '$declaration_name'\n");
1614         }
1615     }
1616
1617     # strip spaces from $param so that it is one continuous string
1618     # on @parameterlist;
1619     # this fixes a problem where check_sections() cannot find
1620     # a parameter like "addr[6 + 2]" because it actually appears
1621     # as "addr[6", "+", "2]" on the parameter list;
1622     # but it's better to maintain the param string unchanged for output,
1623     # so just weaken the string compare in check_sections() to ignore
1624     # "[blah" in a parameter string;
1625     ###$param =~ s/\s*//g;
1626     push @parameterlist, $param;
1627     $org_arg =~ s/\s\s+/ /g;
1628     $parametertypes{$param} = $org_arg;
1629 }
1630
1631 sub check_sections($$$$$) {
1632     my ($file, $decl_name, $decl_type, $sectcheck, $prmscheck) = @_;
1633     my @sects = split ' ', $sectcheck;
1634     my @prms = split ' ', $prmscheck;
1635     my $err;
1636     my ($px, $sx);
1637     my $prm_clean;        # strip trailing "[array size]" and/or beginning "*"
1638
1639     foreach $sx (0 .. $#sects) {
1640         $err = 1;
1641         foreach $px (0 .. $#prms) {
1642             $prm_clean = $prms[$px];
1643             $prm_clean =~ s/\[.*\]//;
1644             $prm_clean =~ s/$attribute//i;
1645             # ignore array size in a parameter string;
1646             # however, the original param string may contain
1647             # spaces, e.g.:  addr[6 + 2]
1648             # and this appears in @prms as "addr[6" since the
1649             # parameter list is split at spaces;
1650             # hence just ignore "[..." for the sections check;
1651             $prm_clean =~ s/\[.*//;
1652
1653             ##$prm_clean =~ s/^\**//;
1654             if ($prm_clean eq $sects[$sx]) {
1655                 $err = 0;
1656                 last;
1657             }
1658         }
1659         if ($err) {
1660             if ($decl_type eq "function") {
1661                 emit_warning("${file}:$.",
1662                     "Excess function parameter " .
1663                     "'$sects[$sx]' " .
1664                     "description in '$decl_name'\n");
1665             } elsif (($decl_type eq "struct") or
1666                           ($decl_type eq "union")) {
1667                 emit_warning("${file}:$.",
1668                     "Excess $decl_type member " .
1669                     "'$sects[$sx]' " .
1670                     "description in '$decl_name'\n");
1671             }
1672         }
1673     }
1674 }
1675
1676 ##
1677 # Checks the section describing the return value of a function.
1678 sub check_return_section {
1679     my $file = shift;
1680     my $declaration_name = shift;
1681     my $return_type = shift;
1682
1683     # Ignore an empty return type (It's a macro)
1684     # Ignore functions with a "void" return type. (But don't ignore "void *")
1685     if (($return_type eq "") || ($return_type =~ /void\s*\w*\s*$/)) {
1686         return;
1687     }
1688
1689     if (!defined($sections{$section_return}) ||
1690         $sections{$section_return} eq "")
1691     {
1692         emit_warning("${file}:$.",
1693                      "No description found for return value of " .
1694                      "'$declaration_name'\n");
1695     }
1696 }
1697
1698 ##
1699 # takes a function prototype and the name of the current file being
1700 # processed and spits out all the details stored in the global
1701 # arrays/hashes.
1702 sub dump_function($$) {
1703     my $prototype = shift;
1704     my $file = shift;
1705     my $noret = 0;
1706
1707     print_lineno($new_start_line);
1708
1709     $prototype =~ s/^static +//;
1710     $prototype =~ s/^extern +//;
1711     $prototype =~ s/^asmlinkage +//;
1712     $prototype =~ s/^inline +//;
1713     $prototype =~ s/^__inline__ +//;
1714     $prototype =~ s/^__inline +//;
1715     $prototype =~ s/^__always_inline +//;
1716     $prototype =~ s/^noinline +//;
1717     $prototype =~ s/^__FORTIFY_INLINE +//;
1718     $prototype =~ s/__init +//;
1719     $prototype =~ s/__init_or_module +//;
1720     $prototype =~ s/__deprecated +//;
1721     $prototype =~ s/__flatten +//;
1722     $prototype =~ s/__meminit +//;
1723     $prototype =~ s/__must_check +//;
1724     $prototype =~ s/__weak +//;
1725     $prototype =~ s/__sched +//;
1726     $prototype =~ s/__printf\s*\(\s*\d*\s*,\s*\d*\s*\) +//;
1727     $prototype =~ s/__(?:re)?alloc_size\s*\(\s*\d+\s*(?:,\s*\d+\s*)?\) +//;
1728     $prototype =~ s/__diagnose_as\s*\(\s*\S+\s*(?:,\s*\d+\s*)*\) +//;
1729     my $define = $prototype =~ s/^#\s*define\s+//; #ak added
1730     $prototype =~ s/__attribute_const__ +//;
1731     $prototype =~ s/__attribute__\s*\(\(
1732             (?:
1733                  [\w\s]++          # attribute name
1734                  (?:\([^)]*+\))?   # attribute arguments
1735                  \s*+,?            # optional comma at the end
1736             )+
1737           \)\)\s+//x;
1738
1739     # Yes, this truly is vile.  We are looking for:
1740     # 1. Return type (may be nothing if we're looking at a macro)
1741     # 2. Function name
1742     # 3. Function parameters.
1743     #
1744     # All the while we have to watch out for function pointer parameters
1745     # (which IIRC is what the two sections are for), C types (these
1746     # regexps don't even start to express all the possibilities), and
1747     # so on.
1748     #
1749     # If you mess with these regexps, it's a good idea to check that
1750     # the following functions' documentation still comes out right:
1751     # - parport_register_device (function pointer parameters)
1752     # - atomic_set (macro)
1753     # - pci_match_device, __copy_to_user (long return type)
1754     my $name = qr{[a-zA-Z0-9_~:]+};
1755     my $prototype_end1 = qr{[^\(]*};
1756     my $prototype_end2 = qr{[^\{]*};
1757     my $prototype_end = qr{\(($prototype_end1|$prototype_end2)\)};
1758     my $type1 = qr{[\w\s]+};
1759     my $type2 = qr{$type1\*+};
1760
1761     if ($define && $prototype =~ m/^()($name)\s+/) {
1762         # This is an object-like macro, it has no return type and no parameter
1763         # list.
1764         # Function-like macros are not allowed to have spaces between
1765         # declaration_name and opening parenthesis (notice the \s+).
1766         $return_type = $1;
1767         $declaration_name = $2;
1768         $noret = 1;
1769     } elsif ($prototype =~ m/^()($name)\s*$prototype_end/ ||
1770         $prototype =~ m/^($type1)\s+($name)\s*$prototype_end/ ||
1771         $prototype =~ m/^($type2+)\s*($name)\s*$prototype_end/)  {
1772         $return_type = $1;
1773         $declaration_name = $2;
1774         my $args = $3;
1775
1776         create_parameterlist($args, ',', $file, $declaration_name);
1777     } else {
1778         emit_warning("${file}:$.", "cannot understand function prototype: '$prototype'\n");
1779         return;
1780     }
1781
1782     if ($identifier ne $declaration_name) {
1783         emit_warning("${file}:$.", "expecting prototype for $identifier(). Prototype was for $declaration_name() instead\n");
1784         return;
1785     }
1786
1787     my $prms = join " ", @parameterlist;
1788     check_sections($file, $declaration_name, "function", $sectcheck, $prms);
1789
1790     # This check emits a lot of warnings at the moment, because many
1791     # functions don't have a 'Return' doc section. So until the number
1792     # of warnings goes sufficiently down, the check is only performed in
1793     # -Wreturn mode.
1794     # TODO: always perform the check.
1795     if ($Wreturn && !$noret) {
1796         check_return_section($file, $declaration_name, $return_type);
1797     }
1798
1799     # The function parser can be called with a typedef parameter.
1800     # Handle it.
1801     if ($return_type =~ /typedef/) {
1802         output_declaration($declaration_name,
1803                            'function',
1804                            {'function' => $declaration_name,
1805                             'typedef' => 1,
1806                             'module' => $modulename,
1807                             'functiontype' => $return_type,
1808                             'parameterlist' => \@parameterlist,
1809                             'parameterdescs' => \%parameterdescs,
1810                             'parametertypes' => \%parametertypes,
1811                             'sectionlist' => \@sectionlist,
1812                             'sections' => \%sections,
1813                             'purpose' => $declaration_purpose
1814                            });
1815     } else {
1816         output_declaration($declaration_name,
1817                            'function',
1818                            {'function' => $declaration_name,
1819                             'module' => $modulename,
1820                             'functiontype' => $return_type,
1821                             'parameterlist' => \@parameterlist,
1822                             'parameterdescs' => \%parameterdescs,
1823                             'parametertypes' => \%parametertypes,
1824                             'sectionlist' => \@sectionlist,
1825                             'sections' => \%sections,
1826                             'purpose' => $declaration_purpose
1827                            });
1828     }
1829 }
1830
1831 sub reset_state {
1832     $function = "";
1833     %parameterdescs = ();
1834     %parametertypes = ();
1835     @parameterlist = ();
1836     %sections = ();
1837     @sectionlist = ();
1838     $sectcheck = "";
1839     $struct_actual = "";
1840     $prototype = "";
1841
1842     $state = STATE_NORMAL;
1843     $inline_doc_state = STATE_INLINE_NA;
1844 }
1845
1846 sub tracepoint_munge($) {
1847     my $file = shift;
1848     my $tracepointname = 0;
1849     my $tracepointargs = 0;
1850
1851     if ($prototype =~ m/TRACE_EVENT\((.*?),/) {
1852         $tracepointname = $1;
1853     }
1854     if ($prototype =~ m/DEFINE_SINGLE_EVENT\((.*?),/) {
1855         $tracepointname = $1;
1856     }
1857     if ($prototype =~ m/DEFINE_EVENT\((.*?),(.*?),/) {
1858         $tracepointname = $2;
1859     }
1860     $tracepointname =~ s/^\s+//; #strip leading whitespace
1861     if ($prototype =~ m/TP_PROTO\((.*?)\)/) {
1862         $tracepointargs = $1;
1863     }
1864     if (($tracepointname eq 0) || ($tracepointargs eq 0)) {
1865         emit_warning("${file}:$.", "Unrecognized tracepoint format: \n".
1866                  "$prototype\n");
1867     } else {
1868         $prototype = "static inline void trace_$tracepointname($tracepointargs)";
1869         $identifier = "trace_$identifier";
1870     }
1871 }
1872
1873 sub syscall_munge() {
1874     my $void = 0;
1875
1876     $prototype =~ s@[\r\n]+@ @gos; # strip newlines/CR's
1877 ##    if ($prototype =~ m/SYSCALL_DEFINE0\s*\(\s*(a-zA-Z0-9_)*\s*\)/) {
1878     if ($prototype =~ m/SYSCALL_DEFINE0/) {
1879         $void = 1;
1880 ##        $prototype = "long sys_$1(void)";
1881     }
1882
1883     $prototype =~ s/SYSCALL_DEFINE.*\(/long sys_/; # fix return type & func name
1884     if ($prototype =~ m/long (sys_.*?),/) {
1885         $prototype =~ s/,/\(/;
1886     } elsif ($void) {
1887         $prototype =~ s/\)/\(void\)/;
1888     }
1889
1890     # now delete all of the odd-number commas in $prototype
1891     # so that arg types & arg names don't have a comma between them
1892     my $count = 0;
1893     my $len = length($prototype);
1894     if ($void) {
1895         $len = 0;    # skip the for-loop
1896     }
1897     for (my $ix = 0; $ix < $len; $ix++) {
1898         if (substr($prototype, $ix, 1) eq ',') {
1899             $count++;
1900             if ($count % 2 == 1) {
1901                 substr($prototype, $ix, 1) = ' ';
1902             }
1903         }
1904     }
1905 }
1906
1907 sub process_proto_function($$) {
1908     my $x = shift;
1909     my $file = shift;
1910
1911     $x =~ s@\/\/.*$@@gos; # strip C99-style comments to end of line
1912
1913     if ($x =~ /^#/ && $x !~ /^#\s*define/) {
1914         # do nothing
1915     } elsif ($x =~ /([^\{]*)/) {
1916         $prototype .= $1;
1917     }
1918
1919     if (($x =~ /\{/) || ($x =~ /\#\s*define/) || ($x =~ /;/)) {
1920         $prototype =~ s@/\*.*?\*/@@gos;        # strip comments.
1921         $prototype =~ s@[\r\n]+@ @gos; # strip newlines/cr's.
1922         $prototype =~ s@^\s+@@gos; # strip leading spaces
1923
1924         # Handle prototypes for function pointers like:
1925         # int (*pcs_config)(struct foo)
1926         $prototype =~ s@^(\S+\s+)\(\s*\*(\S+)\)@$1$2@gos;
1927
1928         if ($prototype =~ /SYSCALL_DEFINE/) {
1929             syscall_munge();
1930         }
1931         if ($prototype =~ /TRACE_EVENT/ || $prototype =~ /DEFINE_EVENT/ ||
1932             $prototype =~ /DEFINE_SINGLE_EVENT/)
1933         {
1934             tracepoint_munge($file);
1935         }
1936         dump_function($prototype, $file);
1937         reset_state();
1938     }
1939 }
1940
1941 sub process_proto_type($$) {
1942     my $x = shift;
1943     my $file = shift;
1944
1945     $x =~ s@[\r\n]+@ @gos; # strip newlines/cr's.
1946     $x =~ s@^\s+@@gos; # strip leading spaces
1947     $x =~ s@\s+$@@gos; # strip trailing spaces
1948     $x =~ s@\/\/.*$@@gos; # strip C99-style comments to end of line
1949
1950     if ($x =~ /^#/) {
1951         # To distinguish preprocessor directive from regular declaration later.
1952         $x .= ";";
1953     }
1954
1955     while (1) {
1956         if ( $x =~ /([^\{\};]*)([\{\};])(.*)/ ) {
1957             if( length $prototype ) {
1958                 $prototype .= " "
1959             }
1960             $prototype .= $1 . $2;
1961             ($2 eq '{') && $brcount++;
1962             ($2 eq '}') && $brcount--;
1963             if (($2 eq ';') && ($brcount == 0)) {
1964                 dump_declaration($prototype, $file);
1965                 reset_state();
1966                 last;
1967             }
1968             $x = $3;
1969         } else {
1970             $prototype .= $x;
1971             last;
1972         }
1973     }
1974 }
1975
1976
1977 sub map_filename($) {
1978     my $file;
1979     my ($orig_file) = @_;
1980
1981     if (defined($ENV{'SRCTREE'})) {
1982         $file = "$ENV{'SRCTREE'}" . "/" . $orig_file;
1983     } else {
1984         $file = $orig_file;
1985     }
1986
1987     if (defined($source_map{$file})) {
1988         $file = $source_map{$file};
1989     }
1990
1991     return $file;
1992 }
1993
1994 sub process_export_file($) {
1995     my ($orig_file) = @_;
1996     my $file = map_filename($orig_file);
1997
1998     if (!open(IN,"<$file")) {
1999         print STDERR "Error: Cannot open file $file\n";
2000         ++$errors;
2001         return;
2002     }
2003
2004     while (<IN>) {
2005         if (/$export_symbol/) {
2006             next if (defined($nosymbol_table{$2}));
2007             $function_table{$2} = 1;
2008         }
2009         if (/$export_symbol_ns/) {
2010             next if (defined($nosymbol_table{$2}));
2011             $function_table{$2} = 1;
2012         }
2013     }
2014
2015     close(IN);
2016 }
2017
2018 #
2019 # Parsers for the various processing states.
2020 #
2021 # STATE_NORMAL: looking for the /** to begin everything.
2022 #
2023 sub process_normal() {
2024     if (/$doc_start/o) {
2025         $state = STATE_NAME;        # next line is always the function name
2026         $in_doc_sect = 0;
2027         $declaration_start_line = $. + 1;
2028     }
2029 }
2030
2031 #
2032 # STATE_NAME: Looking for the "name - description" line
2033 #
2034 sub process_name($$) {
2035     my $file = shift;
2036     my $descr;
2037
2038     if (/$doc_block/o) {
2039         $state = STATE_DOCBLOCK;
2040         $contents = "";
2041         $new_start_line = $.;
2042
2043         if ( $1 eq "" ) {
2044             $section = $section_intro;
2045         } else {
2046             $section = $1;
2047         }
2048     } elsif (/$doc_decl/o) {
2049         $identifier = $1;
2050         my $is_kernel_comment = 0;
2051         my $decl_start = qr{$doc_com};
2052         # test for pointer declaration type, foo * bar() - desc
2053         my $fn_type = qr{\w+\s*\*\s*};
2054         my $parenthesis = qr{\(\w*\)};
2055         my $decl_end = qr{[-:].*};
2056         if (/^$decl_start([\w\s]+?)$parenthesis?\s*$decl_end?$/) {
2057             $identifier = $1;
2058         }
2059         if ($identifier =~ m/^(struct|union|enum|typedef)\b\s*(\S*)/) {
2060             $decl_type = $1;
2061             $identifier = $2;
2062             $is_kernel_comment = 1;
2063         }
2064         # Look for foo() or static void foo() - description; or misspelt
2065         # identifier
2066         elsif (/^$decl_start$fn_type?(\w+)\s*$parenthesis?\s*$decl_end?$/ ||
2067             /^$decl_start$fn_type?(\w+.*)$parenthesis?\s*$decl_end$/) {
2068             $identifier = $1;
2069             $decl_type = 'function';
2070             $identifier =~ s/^define\s+//;
2071             $is_kernel_comment = 1;
2072         }
2073         $identifier =~ s/\s+$//;
2074
2075         $state = STATE_BODY;
2076         # if there's no @param blocks need to set up default section
2077         # here
2078         $contents = "";
2079         $section = $section_default;
2080         $new_start_line = $. + 1;
2081         if (/[-:](.*)/) {
2082             # strip leading/trailing/multiple spaces
2083             $descr= $1;
2084             $descr =~ s/^\s*//;
2085             $descr =~ s/\s*$//;
2086             $descr =~ s/\s+/ /g;
2087             $declaration_purpose = $descr;
2088             $state = STATE_BODY_MAYBE;
2089         } else {
2090             $declaration_purpose = "";
2091         }
2092
2093         if (!$is_kernel_comment) {
2094             emit_warning("${file}:$.", "This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst\n$_");
2095             $state = STATE_NORMAL;
2096         }
2097
2098         if (($declaration_purpose eq "") && $Wshort_desc) {
2099             emit_warning("${file}:$.", "missing initial short description on line:\n$_");
2100         }
2101
2102         if ($identifier eq "" && $decl_type ne "enum") {
2103             emit_warning("${file}:$.", "wrong kernel-doc identifier on line:\n$_");
2104             $state = STATE_NORMAL;
2105         }
2106
2107         if ($verbose) {
2108             print STDERR "${file}:$.: info: Scanning doc for $decl_type $identifier\n";
2109         }
2110     } else {
2111         emit_warning("${file}:$.", "Cannot understand $_ on line $. - I thought it was a doc line\n");
2112         $state = STATE_NORMAL;
2113     }
2114 }
2115
2116
2117 #
2118 # STATE_BODY and STATE_BODY_MAYBE: the bulk of a kerneldoc comment.
2119 #
2120 sub process_body($$) {
2121     my $file = shift;
2122
2123     if ($state == STATE_BODY_WITH_BLANK_LINE && /^\s*\*\s?\S/) {
2124         dump_section($file, $section, $contents);
2125         $section = $section_default;
2126         $new_start_line = $.;
2127         $contents = "";
2128     }
2129
2130     if (/$doc_sect/i) { # case insensitive for supported section names
2131         $in_doc_sect = 1;
2132         $newsection = $1;
2133         $newcontents = $2;
2134
2135         # map the supported section names to the canonical names
2136         if ($newsection =~ m/^description$/i) {
2137             $newsection = $section_default;
2138         } elsif ($newsection =~ m/^context$/i) {
2139             $newsection = $section_context;
2140         } elsif ($newsection =~ m/^returns?$/i) {
2141             $newsection = $section_return;
2142         } elsif ($newsection =~ m/^\@return$/) {
2143             # special: @return is a section, not a param description
2144             $newsection = $section_return;
2145         }
2146
2147         if (($contents ne "") && ($contents ne "\n")) {
2148             if (!$in_doc_sect && $Wcontents_before_sections) {
2149                 emit_warning("${file}:$.", "contents before sections\n");
2150             }
2151             dump_section($file, $section, $contents);
2152             $section = $section_default;
2153         }
2154
2155         $in_doc_sect = 1;
2156         $state = STATE_BODY;
2157         $contents = $newcontents;
2158         $new_start_line = $.;
2159         while (substr($contents, 0, 1) eq " ") {
2160             $contents = substr($contents, 1);
2161         }
2162         if ($contents ne "") {
2163             $contents .= "\n";
2164         }
2165         $section = $newsection;
2166         $leading_space = undef;
2167     } elsif (/$doc_end/) {
2168         if (($contents ne "") && ($contents ne "\n")) {
2169             dump_section($file, $section, $contents);
2170             $section = $section_default;
2171             $contents = "";
2172         }
2173         # look for doc_com + <text> + doc_end:
2174         if ($_ =~ m'\s*\*\s*[a-zA-Z_0-9:\.]+\*/') {
2175             emit_warning("${file}:$.", "suspicious ending line: $_");
2176         }
2177
2178         $prototype = "";
2179         $state = STATE_PROTO;
2180         $brcount = 0;
2181         $new_start_line = $. + 1;
2182     } elsif (/$doc_content/) {
2183         if ($1 eq "") {
2184             if ($section eq $section_context) {
2185                 dump_section($file, $section, $contents);
2186                 $section = $section_default;
2187                 $contents = "";
2188                 $new_start_line = $.;
2189                 $state = STATE_BODY;
2190             } else {
2191                 if ($section ne $section_default) {
2192                     $state = STATE_BODY_WITH_BLANK_LINE;
2193                 } else {
2194                     $state = STATE_BODY;
2195                 }
2196                 $contents .= "\n";
2197             }
2198         } elsif ($state == STATE_BODY_MAYBE) {
2199             # Continued declaration purpose
2200             chomp($declaration_purpose);
2201             $declaration_purpose .= " " . $1;
2202             $declaration_purpose =~ s/\s+/ /g;
2203         } else {
2204             my $cont = $1;
2205             if ($section =~ m/^@/ || $section eq $section_context) {
2206                 if (!defined $leading_space) {
2207                     if ($cont =~ m/^(\s+)/) {
2208                         $leading_space = $1;
2209                     } else {
2210                         $leading_space = "";
2211                     }
2212                 }
2213                 $cont =~ s/^$leading_space//;
2214             }
2215             $contents .= $cont . "\n";
2216         }
2217     } else {
2218         # i dont know - bad line?  ignore.
2219         emit_warning("${file}:$.", "bad line: $_");
2220     }
2221 }
2222
2223
2224 #
2225 # STATE_PROTO: reading a function/whatever prototype.
2226 #
2227 sub process_proto($$) {
2228     my $file = shift;
2229
2230     if (/$doc_inline_oneline/) {
2231         $section = $1;
2232         $contents = $2;
2233         if ($contents ne "") {
2234             $contents .= "\n";
2235             dump_section($file, $section, $contents);
2236             $section = $section_default;
2237             $contents = "";
2238         }
2239     } elsif (/$doc_inline_start/) {
2240         $state = STATE_INLINE;
2241         $inline_doc_state = STATE_INLINE_NAME;
2242     } elsif ($decl_type eq 'function') {
2243         process_proto_function($_, $file);
2244     } else {
2245         process_proto_type($_, $file);
2246     }
2247 }
2248
2249 #
2250 # STATE_DOCBLOCK: within a DOC: block.
2251 #
2252 sub process_docblock($$) {
2253     my $file = shift;
2254
2255     if (/$doc_end/) {
2256         dump_doc_section($file, $section, $contents);
2257         $section = $section_default;
2258         $contents = "";
2259         $function = "";
2260         %parameterdescs = ();
2261         %parametertypes = ();
2262         @parameterlist = ();
2263         %sections = ();
2264         @sectionlist = ();
2265         $prototype = "";
2266         $state = STATE_NORMAL;
2267     } elsif (/$doc_content/) {
2268         if ( $1 eq "" )        {
2269             $contents .= $blankline;
2270         } else {
2271             $contents .= $1 . "\n";
2272         }
2273     }
2274 }
2275
2276 #
2277 # STATE_INLINE: docbook comments within a prototype.
2278 #
2279 sub process_inline($$) {
2280     my $file = shift;
2281
2282     # First line (state 1) needs to be a @parameter
2283     if ($inline_doc_state == STATE_INLINE_NAME && /$doc_inline_sect/o) {
2284         $section = $1;
2285         $contents = $2;
2286         $new_start_line = $.;
2287         if ($contents ne "") {
2288             while (substr($contents, 0, 1) eq " ") {
2289                 $contents = substr($contents, 1);
2290             }
2291             $contents .= "\n";
2292         }
2293         $inline_doc_state = STATE_INLINE_TEXT;
2294         # Documentation block end */
2295     } elsif (/$doc_inline_end/) {
2296         if (($contents ne "") && ($contents ne "\n")) {
2297             dump_section($file, $section, $contents);
2298             $section = $section_default;
2299             $contents = "";
2300         }
2301         $state = STATE_PROTO;
2302         $inline_doc_state = STATE_INLINE_NA;
2303         # Regular text
2304     } elsif (/$doc_content/) {
2305         if ($inline_doc_state == STATE_INLINE_TEXT) {
2306             $contents .= $1 . "\n";
2307             # nuke leading blank lines
2308             if ($contents =~ /^\s*$/) {
2309                 $contents = "";
2310             }
2311         } elsif ($inline_doc_state == STATE_INLINE_NAME) {
2312             $inline_doc_state = STATE_INLINE_ERROR;
2313             emit_warning("${file}:$.", "Incorrect use of kernel-doc format: $_");
2314         }
2315     }
2316 }
2317
2318
2319 sub process_file($) {
2320     my $file;
2321     my $initial_section_counter = $section_counter;
2322     my ($orig_file) = @_;
2323
2324     $file = map_filename($orig_file);
2325
2326     if (!open(IN_FILE,"<$file")) {
2327         print STDERR "Error: Cannot open file $file\n";
2328         ++$errors;
2329         return;
2330     }
2331
2332     $. = 1;
2333
2334     $section_counter = 0;
2335     while (<IN_FILE>) {
2336         while (!/^ \*/ && s/\\\s*$//) {
2337             $_ .= <IN_FILE>;
2338         }
2339         # Replace tabs by spaces
2340         while ($_ =~ s/\t+/' ' x (length($&) * 8 - length($`) % 8)/e) {};
2341         # Hand this line to the appropriate state handler
2342         if ($state == STATE_NORMAL) {
2343             process_normal();
2344         } elsif ($state == STATE_NAME) {
2345             process_name($file, $_);
2346         } elsif ($state == STATE_BODY || $state == STATE_BODY_MAYBE ||
2347                  $state == STATE_BODY_WITH_BLANK_LINE) {
2348             process_body($file, $_);
2349         } elsif ($state == STATE_INLINE) { # scanning for inline parameters
2350             process_inline($file, $_);
2351         } elsif ($state == STATE_PROTO) {
2352             process_proto($file, $_);
2353         } elsif ($state == STATE_DOCBLOCK) {
2354             process_docblock($file, $_);
2355         }
2356     }
2357
2358     # Make sure we got something interesting.
2359     if ($initial_section_counter == $section_counter && $
2360         output_mode ne "none") {
2361         if ($output_selection == OUTPUT_INCLUDE) {
2362             emit_warning("${file}:1", "'$_' not found\n")
2363                 for keys %function_table;
2364         } else {
2365             emit_warning("${file}:1", "no structured comments found\n");
2366         }
2367     }
2368     close IN_FILE;
2369 }
2370
2371
2372 if ($output_mode eq "rst") {
2373     get_sphinx_version() if (!$sphinx_major);
2374 }
2375
2376 $kernelversion = get_kernel_version();
2377
2378 # generate a sequence of code that will splice in highlighting information
2379 # using the s// operator.
2380 for (my $k = 0; $k < @highlights; $k++) {
2381     my $pattern = $highlights[$k][0];
2382     my $result = $highlights[$k][1];
2383 #   print STDERR "scanning pattern:$pattern, highlight:($result)\n";
2384     $dohighlight .=  "\$contents =~ s:$pattern:$result:gs;\n";
2385 }
2386
2387 # Read the file that maps relative names to absolute names for
2388 # separate source and object directories and for shadow trees.
2389 if (open(SOURCE_MAP, "<.tmp_filelist.txt")) {
2390     my ($relname, $absname);
2391     while(<SOURCE_MAP>) {
2392         chop();
2393         ($relname, $absname) = (split())[0..1];
2394         $relname =~ s:^/+::;
2395         $source_map{$relname} = $absname;
2396     }
2397     close(SOURCE_MAP);
2398 }
2399
2400 if ($output_selection == OUTPUT_EXPORTED ||
2401     $output_selection == OUTPUT_INTERNAL) {
2402
2403     push(@export_file_list, @ARGV);
2404
2405     foreach (@export_file_list) {
2406         chomp;
2407         process_export_file($_);
2408     }
2409 }
2410
2411 foreach (@ARGV) {
2412     chomp;
2413     process_file($_);
2414 }
2415 if ($verbose && $errors) {
2416     print STDERR "$errors errors\n";
2417 }
2418 if ($verbose && $warnings) {
2419     print STDERR "$warnings warnings\n";
2420 }
2421
2422 if ($Werror && $warnings) {
2423     print STDERR "$warnings warnings as Errors\n";
2424     exit($warnings);
2425 } else {
2426     exit($output_mode eq "none" ? 0 : $errors)
2427 }
2428
2429 __END__
2430
2431 =head1 OPTIONS
2432
2433 =head2 Output format selection (mutually exclusive):
2434
2435 =over 8
2436
2437 =item -man
2438
2439 Output troff manual page format.
2440
2441 =item -rst
2442
2443 Output reStructuredText format. This is the default.
2444
2445 =item -none
2446
2447 Do not output documentation, only warnings.
2448
2449 =back
2450
2451 =head2 Output format modifiers
2452
2453 =head3 reStructuredText only
2454
2455 =over 8
2456
2457 =item -sphinx-version VERSION
2458
2459 Use the ReST C domain dialect compatible with a specific Sphinx Version.
2460
2461 If not specified, kernel-doc will auto-detect using the sphinx-build version
2462 found on PATH.
2463
2464 =back
2465
2466 =head2 Output selection (mutually exclusive):
2467
2468 =over 8
2469
2470 =item -export
2471
2472 Only output documentation for the symbols that have been exported using
2473 EXPORT_SYMBOL() and related macros in any input FILE or -export-file FILE.
2474
2475 =item -internal
2476
2477 Only output documentation for the symbols that have NOT been exported using
2478 EXPORT_SYMBOL() and related macros in any input FILE or -export-file FILE.
2479
2480 =item -function NAME
2481
2482 Only output documentation for the given function or DOC: section title.
2483 All other functions and DOC: sections are ignored.
2484
2485 May be specified multiple times.
2486
2487 =item -nosymbol NAME
2488
2489 Exclude the specified symbol from the output documentation.
2490
2491 May be specified multiple times.
2492
2493 =back
2494
2495 =head2 Output selection modifiers:
2496
2497 =over 8
2498
2499 =item -no-doc-sections
2500
2501 Do not output DOC: sections.
2502
2503 =item -export-file FILE
2504
2505 Specify an additional FILE in which to look for EXPORT_SYMBOL information.
2506
2507 To be used with -export or -internal.
2508
2509 May be specified multiple times.
2510
2511 =back
2512
2513 =head3 reStructuredText only
2514
2515 =over 8
2516
2517 =item -enable-lineno
2518
2519 Enable output of .. LINENO lines.
2520
2521 =back
2522
2523 =head2 Other parameters:
2524
2525 =over 8
2526
2527 =item -h, -help
2528
2529 Print this help.
2530
2531 =item -v
2532
2533 Verbose output, more warnings and other information.
2534
2535 =item -Werror
2536
2537 Treat warnings as errors.
2538
2539 =back
2540
2541 =cut