xref: /openbmc/linux/scripts/get_abi.pl (revision be58f710) 
1#!/usr/bin/env perl
2# SPDX-License-Identifier: GPL-2.0
3
4use strict;
5use warnings;
6use utf8;
7use Pod::Usage;
8use Getopt::Long;
9use File::Find;
10use Fcntl ':mode';
11
12my $help = 0;
13my $man = 0;
14my $debug = 0;
15my $enable_lineno = 0;
16my $prefix="Documentation/ABI";
17
18#
19# If true, assumes that the description is formatted with ReST
20#
21my $description_is_rst = 1;
22
23GetOptions(
24	"debug|d+" => \$debug,
25	"enable-lineno" => \$enable_lineno,
26	"rst-source!" => \$description_is_rst,
27	"dir=s" => \$prefix,
28	'help|?' => \$help,
29	man => \$man
30) or pod2usage(2);
31
32pod2usage(1) if $help;
33pod2usage(-exitstatus => 0, -verbose => 2) if $man;
34
35pod2usage(2) if (scalar @ARGV < 1 || @ARGV > 2);
36
37my ($cmd, $arg) = @ARGV;
38
39pod2usage(2) if ($cmd ne "search" && $cmd ne "rest" && $cmd ne "validate");
40pod2usage(2) if ($cmd eq "search" && !$arg);
41
42require Data::Dumper if ($debug);
43
44my %data;
45my %symbols;
46
47#
48# Displays an error message, printing file name and line
49#
50sub parse_error($$$$) {
51	my ($file, $ln, $msg, $data) = @_;
52
53	$data =~ s/\s+$/\n/;
54
55	print STDERR "Warning: file $file#$ln:\n\t$msg";
56
57	if ($data ne "") {
58		print STDERR ". Line\n\t\t$data";
59	} else {
60	    print STDERR "\n";
61	}
62}
63
64#
65# Parse an ABI file, storing its contents at %data
66#
67sub parse_abi {
68	my $file = $File::Find::name;
69
70	my $mode = (stat($file))[2];
71	return if ($mode & S_IFDIR);
72	return if ($file =~ m,/README,);
73
74	my $name = $file;
75	$name =~ s,.*/,,;
76
77	my $fn = $file;
78	$fn =~ s,Documentation/ABI/,,;
79
80	my $nametag = "File $fn";
81	$data{$nametag}->{what} = "File $name";
82	$data{$nametag}->{type} = "File";
83	$data{$nametag}->{file} = $name;
84	$data{$nametag}->{filepath} = $file;
85	$data{$nametag}->{is_file} = 1;
86	$data{$nametag}->{line_no} = 1;
87
88	my $type = $file;
89	$type =~ s,.*/(.*)/.*,$1,;
90
91	my $what;
92	my $new_what;
93	my $tag = "";
94	my $ln;
95	my $xrefs;
96	my $space;
97	my @labels;
98	my $label = "";
99
100	print STDERR "Opening $file\n" if ($debug > 1);
101	open IN, $file;
102	while(<IN>) {
103		$ln++;
104		if (m/^(\S+)(:\s*)(.*)/i) {
105			my $new_tag = lc($1);
106			my $sep = $2;
107			my $content = $3;
108
109			if (!($new_tag =~ m/(what|where|date|kernelversion|contact|description|users)/)) {
110				if ($tag eq "description") {
111					# New "tag" is actually part of
112					# description. Don't consider it a tag
113					$new_tag = "";
114				} elsif ($tag ne "") {
115					parse_error($file, $ln, "tag '$tag' is invalid", $_);
116				}
117			}
118
119			# Invalid, but it is a common mistake
120			if ($new_tag eq "where") {
121				parse_error($file, $ln, "tag 'Where' is invalid. Should be 'What:' instead", "");
122				$new_tag = "what";
123			}
124
125			if ($new_tag =~ m/what/) {
126				$space = "";
127				$content =~ s/[,.;]$//;
128
129				push @{$symbols{$content}->{file}}, " $file:" . ($ln - 1);
130
131				if ($tag =~ m/what/) {
132					$what .= ", " . $content;
133				} else {
134					if ($what) {
135						parse_error($file, $ln, "What '$what' doesn't have a description", "") if (!$data{$what}->{description});
136
137						foreach my $w(split /, /, $what) {
138							$symbols{$w}->{xref} = $what;
139						};
140					}
141
142					$what = $content;
143					$label = $content;
144					$new_what = 1;
145				}
146				push @labels, [($content, $label)];
147				$tag = $new_tag;
148
149				push @{$data{$nametag}->{symbols}}, $content if ($data{$nametag}->{what});
150				next;
151			}
152
153			if ($tag ne "" && $new_tag) {
154				$tag = $new_tag;
155
156				if ($new_what) {
157					@{$data{$what}->{label_list}} = @labels if ($data{$nametag}->{what});
158					@labels = ();
159					$label = "";
160					$new_what = 0;
161
162					$data{$what}->{type} = $type;
163					if (!defined($data{$what}->{file})) {
164						$data{$what}->{file} = $name;
165						$data{$what}->{filepath} = $file;
166					} else {
167						if ($name ne $data{$what}->{file}) {
168							$data{$what}->{file} .= " " . $name;
169							$data{$what}->{filepath} .= " " . $file;
170						}
171					}
172					print STDERR "\twhat: $what\n" if ($debug > 1);
173					$data{$what}->{line_no} = $ln;
174				} else {
175					$data{$what}->{line_no} = $ln if (!defined($data{$what}->{line_no}));
176				}
177
178				if (!$what) {
179					parse_error($file, $ln, "'What:' should come first:", $_);
180					next;
181				}
182				if ($new_tag eq "description") {
183					$sep =~ s,:, ,;
184					$content = ' ' x length($new_tag) . $sep . $content;
185					while ($content =~ s/\t+/' ' x (length($&) * 8 - length($`) % 8)/e) {}
186					if ($content =~ m/^(\s*)(\S.*)$/) {
187						# Preserve initial spaces for the first line
188						$space = $1;
189						$content = "$2\n";
190						$data{$what}->{$tag} .= $content;
191					} else {
192						undef($space);
193					}
194
195				} else {
196					$data{$what}->{$tag} = $content;
197				}
198				next;
199			}
200		}
201
202		# Store any contents before tags at the database
203		if (!$tag && $data{$nametag}->{what}) {
204			$data{$nametag}->{description} .= $_;
205			next;
206		}
207
208		if ($tag eq "description") {
209			my $content = $_;
210			while ($content =~ s/\t+/' ' x (length($&) * 8 - length($`) % 8)/e) {}
211			if (m/^\s*\n/) {
212				$data{$what}->{$tag} .= "\n";
213				next;
214			}
215
216			if (!defined($space)) {
217				# Preserve initial spaces for the first line
218				if ($content =~ m/^(\s*)(\S.*)$/) {
219					$space = $1;
220					$content = "$2\n";
221				}
222			} else {
223				$space = "" if (!($content =~ s/^($space)//));
224			}
225			$data{$what}->{$tag} .= $content;
226
227			next;
228		}
229		if (m/^\s*(.*)/) {
230			$data{$what}->{$tag} .= "\n$1";
231			$data{$what}->{$tag} =~ s/\n+$//;
232			next;
233		}
234
235		# Everything else is error
236		parse_error($file, $ln, "Unexpected content", $_);
237	}
238	$data{$nametag}->{description} =~ s/^\n+// if ($data{$nametag}->{description});
239	if ($what) {
240		parse_error($file, $ln, "What '$what' doesn't have a description", "") if (!$data{$what}->{description});
241
242		foreach my $w(split /, /,$what) {
243			$symbols{$w}->{xref} = $what;
244		};
245	}
246	close IN;
247}
248
249sub create_labels {
250	my %labels;
251
252	foreach my $what (keys %data) {
253		next if ($data{$what}->{file} eq "File");
254
255		foreach my $p (@{$data{$what}->{label_list}}) {
256			my ($content, $label) = @{$p};
257			$label = "abi_" . $label . " ";
258			$label =~ tr/A-Z/a-z/;
259
260			# Convert special chars to "_"
261			$label =~s/([\x00-\x2f\x3a-\x40\x5b-\x60\x7b-\xff])/_/g;
262			$label =~ s,_+,_,g;
263			$label =~ s,_$,,;
264
265			# Avoid duplicated labels
266			while (defined($labels{$label})) {
267			    my @chars = ("A".."Z", "a".."z");
268			    $label .= $chars[rand @chars];
269			}
270			$labels{$label} = 1;
271
272			$data{$what}->{label} = $label;
273
274			# only one label is enough
275			last;
276		}
277	}
278}
279
280#
281# Outputs the book on ReST format
282#
283
284# \b doesn't work well with paths. So, we need to define something else:
285# Boundaries are punct characters, spaces and end-of-line
286my $start = qr {(^|\s|\() }x;
287my $bondary = qr { ([,.:;\)\s]|\z) }x;
288my $xref_match = qr { $start(\/(sys|config|proc|dev|kvd)\/[^,.:;\)\s]+)$bondary }x;
289my $symbols = qr { ([\x01-\x08\x0e-\x1f\x21-\x2f\x3a-\x40\x7b-\xff]) }x;
290
291sub output_rest {
292	create_labels();
293
294	my $part = "";
295
296	foreach my $what (sort {
297				($data{$a}->{type} eq "File") cmp ($data{$b}->{type} eq "File") ||
298				$a cmp $b
299			       } keys %data) {
300		my $type = $data{$what}->{type};
301
302		my @file = split / /, $data{$what}->{file};
303		my @filepath = split / /, $data{$what}->{filepath};
304
305		if ($enable_lineno) {
306			printf "#define LINENO %s%s#%s\n\n",
307			       $prefix, $file[0],
308			       $data{$what}->{line_no};
309		}
310
311		my $w = $what;
312
313		if ($type ne "File") {
314			my $cur_part = $what;
315			if ($what =~ '/') {
316				if ($what =~ m#^(\/?(?:[\w\-]+\/?){1,2})#) {
317					$cur_part = "Symbols under $1";
318					$cur_part =~ s,/$,,;
319				}
320			}
321
322			if ($cur_part ne "" && $part ne $cur_part) {
323			    $part = $cur_part;
324			    my $bar = $part;
325			    $bar =~ s/./-/g;
326			    print "$part\n$bar\n\n";
327			}
328
329			printf ".. _%s:\n\n", $data{$what}->{label};
330
331			my @names = split /, /,$w;
332			my $len = 0;
333
334			foreach my $name (@names) {
335				$name =~ s/$symbols/\\$1/g;
336				$name = "**$name**";
337				$len = length($name) if (length($name) > $len);
338			}
339
340			print "+-" . "-" x $len . "-+\n";
341			foreach my $name (@names) {
342				printf "| %s", $name . " " x ($len - length($name)) . " |\n";
343				print "+-" . "-" x $len . "-+\n";
344			}
345
346			print "\n";
347		}
348
349		for (my $i = 0; $i < scalar(@filepath); $i++) {
350			my $path = $filepath[$i];
351			my $f = $file[$i];
352
353			$path =~ s,.*/(.*/.*),$1,;;
354			$path =~ s,[/\-],_,g;;
355			my $fileref = "abi_file_".$path;
356
357			if ($type eq "File") {
358				print ".. _$fileref:\n\n";
359			} else {
360				print "Defined on file :ref:`$f <$fileref>`\n\n";
361			}
362		}
363
364		if ($type eq "File") {
365			my $bar = $w;
366			$bar =~ s/./-/g;
367			print "$w\n$bar\n\n";
368		}
369
370		my $desc = "";
371		$desc = $data{$what}->{description} if (defined($data{$what}->{description}));
372		$desc =~ s/\s+$/\n/;
373
374		if (!($desc =~ /^\s*$/)) {
375			if ($description_is_rst) {
376				# Remove title markups from the description
377				# Having titles inside ABI files will only work if extra
378				# care would be taken in order to strictly follow the same
379				# level order for each markup.
380				$desc =~ s/\n[\-\*\=\^\~]+\n/\n\n/g;
381
382				# Enrich text by creating cross-references
383
384				my $new_desc = "";
385				my $init_indent = -1;
386				my $literal_indent = -1;
387
388				open(my $fh, "+<", \$desc);
389				while (my $d = <$fh>) {
390					my $indent = $d =~ m/^(\s+)/;
391					my $spaces = length($indent);
392					$init_indent = $indent if ($init_indent < 0);
393					if ($literal_indent >= 0) {
394						if ($spaces > $literal_indent) {
395							$new_desc .= $d;
396							next;
397						} else {
398							$literal_indent = -1;
399						}
400					} else {
401						if ($d =~ /()::$/ && !($d =~ /^\s*\.\./)) {
402							$literal_indent = $spaces;
403						}
404					}
405
406					$d =~ s,Documentation/(?!devicetree)(\S+)\.rst,:doc:`/$1`,g;
407
408					my @matches = $d =~ m,Documentation/ABI/([\w\/\-]+),g;
409					foreach my $f (@matches) {
410						my $xref = $f;
411						my $path = $f;
412						$path =~ s,.*/(.*/.*),$1,;;
413						$path =~ s,[/\-],_,g;;
414						$xref .= " <abi_file_" . $path . ">";
415						$d =~ s,\bDocumentation/ABI/$f\b,:ref:`$xref`,g;
416					}
417
418					# Seek for cross reference symbols like /sys/...
419					@matches = $d =~ m/$xref_match/g;
420
421					foreach my $s (@matches) {
422						next if (!($s =~ m,/,));
423						if (defined($data{$s}) && defined($data{$s}->{label})) {
424							my $xref = $s;
425
426							$xref =~ s/$symbols/\\$1/g;
427							$xref = ":ref:`$xref <" . $data{$s}->{label} . ">`";
428
429							$d =~ s,$start$s$bondary,$1$xref$2,g;
430						}
431					}
432					$new_desc .= $d;
433				}
434				close $fh;
435
436
437				print "$new_desc\n\n";
438			} else {
439				$desc =~ s/^\s+//;
440
441				# Remove title markups from the description, as they won't work
442				$desc =~ s/\n[\-\*\=\^\~]+\n/\n\n/g;
443
444				if ($desc =~ m/\:\n/ || $desc =~ m/\n[\t ]+/  || $desc =~ m/[\x00-\x08\x0b-\x1f\x7b-\xff]/) {
445					# put everything inside a code block
446					$desc =~ s/\n/\n /g;
447
448					print "::\n\n";
449					print " $desc\n\n";
450				} else {
451					# Escape any special chars from description
452					$desc =~s/([\x00-\x08\x0b-\x1f\x21-\x2a\x2d\x2f\x3c-\x40\x5c\x5e-\x60\x7b-\xff])/\\$1/g;
453					print "$desc\n\n";
454				}
455			}
456		} else {
457			print "DESCRIPTION MISSING for $what\n\n" if (!$data{$what}->{is_file});
458		}
459
460		if ($data{$what}->{symbols}) {
461			printf "Has the following ABI:\n\n";
462
463			foreach my $content(@{$data{$what}->{symbols}}) {
464				my $label = $data{$symbols{$content}->{xref}}->{label};
465
466				# Escape special chars from content
467				$content =~s/([\x00-\x1f\x21-\x2f\x3a-\x40\x7b-\xff])/\\$1/g;
468
469				print "- :ref:`$content <$label>`\n\n";
470			}
471		}
472
473		if (defined($data{$what}->{users})) {
474			my $users = $data{$what}->{users};
475
476			$users =~ s/\n/\n\t/g;
477			printf "Users:\n\t%s\n\n", $users if ($users ne "");
478		}
479
480	}
481}
482
483#
484# Searches for ABI symbols
485#
486sub search_symbols {
487	foreach my $what (sort keys %data) {
488		next if (!($what =~ m/($arg)/));
489
490		my $type = $data{$what}->{type};
491		next if ($type eq "File");
492
493		my $file = $data{$what}->{filepath};
494
495		my $bar = $what;
496		$bar =~ s/./-/g;
497
498		print "\n$what\n$bar\n\n";
499
500		my $kernelversion = $data{$what}->{kernelversion} if (defined($data{$what}->{kernelversion}));
501		my $contact = $data{$what}->{contact} if (defined($data{$what}->{contact}));
502		my $users = $data{$what}->{users} if (defined($data{$what}->{users}));
503		my $date = $data{$what}->{date} if (defined($data{$what}->{date}));
504		my $desc = $data{$what}->{description} if (defined($data{$what}->{description}));
505
506		$kernelversion =~ s/^\s+// if ($kernelversion);
507		$contact =~ s/^\s+// if ($contact);
508		if ($users) {
509			$users =~ s/^\s+//;
510			$users =~ s/\n//g;
511		}
512		$date =~ s/^\s+// if ($date);
513		$desc =~ s/^\s+// if ($desc);
514
515		printf "Kernel version:\t\t%s\n", $kernelversion if ($kernelversion);
516		printf "Date:\t\t\t%s\n", $date if ($date);
517		printf "Contact:\t\t%s\n", $contact if ($contact);
518		printf "Users:\t\t\t%s\n", $users if ($users);
519		print "Defined on file(s):\t$file\n\n";
520		print "Description:\n\n$desc";
521	}
522}
523
524# Ensure that the prefix will always end with a slash
525# While this is not needed for find, it makes the patch nicer
526# with --enable-lineno
527$prefix =~ s,/?$,/,;
528
529#
530# Parses all ABI files located at $prefix dir
531#
532find({wanted =>\&parse_abi, no_chdir => 1}, $prefix);
533
534print STDERR Data::Dumper->Dump([\%data], [qw(*data)]) if ($debug);
535
536#
537# Handles the command
538#
539if ($cmd eq "search") {
540	search_symbols;
541} else {
542	if ($cmd eq "rest") {
543		output_rest;
544	}
545
546	# Warn about duplicated ABI entries
547	foreach my $what(sort keys %symbols) {
548		my @files = @{$symbols{$what}->{file}};
549
550		next if (scalar(@files) == 1);
551
552		printf STDERR "Warning: $what is defined %d times: @files\n",
553		    scalar(@files);
554	}
555}
556
557__END__
558
559=head1 NAME
560
561abi_book.pl - parse the Linux ABI files and produce a ReST book.
562
563=head1 SYNOPSIS
564
565B<abi_book.pl> [--debug] [--enable-lineno] [--man] [--help]
566	       [--(no-)rst-source] [--dir=<dir>] <COMAND> [<ARGUMENT>]
567
568Where <COMMAND> can be:
569
570=over 8
571
572B<search> [SEARCH_REGEX] - search for [SEARCH_REGEX] inside ABI
573
574B<rest>                  - output the ABI in ReST markup language
575
576B<validate>              - validate the ABI contents
577
578=back
579
580=head1 OPTIONS
581
582=over 8
583
584=item B<--dir>
585
586Changes the location of the ABI search. By default, it uses
587the Documentation/ABI directory.
588
589=item B<--rst-source> and B<--no-rst-source>
590
591The input file may be using ReST syntax or not. Those two options allow
592selecting between a rst-compliant source ABI (--rst-source), or a
593plain text that may be violating ReST spec, so it requres some escaping
594logic (--no-rst-source).
595
596=item B<--enable-lineno>
597
598Enable output of #define LINENO lines.
599
600=item B<--debug>
601
602Put the script in verbose mode, useful for debugging. Can be called multiple
603times, to increase verbosity.
604
605=item B<--help>
606
607Prints a brief help message and exits.
608
609=item B<--man>
610
611Prints the manual page and exits.
612
613=back
614
615=head1 DESCRIPTION
616
617Parse the Linux ABI files from ABI DIR (usually located at Documentation/ABI),
618allowing to search for ABI symbols or to produce a ReST book containing
619the Linux ABI documentation.
620
621=head1 EXAMPLES
622
623Search for all stable symbols with the word "usb":
624
625=over 8
626
627$ scripts/get_abi.pl search usb --dir Documentation/ABI/stable
628
629=back
630
631Search for all symbols that match the regex expression "usb.*cap":
632
633=over 8
634
635$ scripts/get_abi.pl search usb.*cap
636
637=back
638
639Output all obsoleted symbols in ReST format
640
641=over 8
642
643$ scripts/get_abi.pl rest --dir Documentation/ABI/obsolete
644
645=back
646
647=head1 BUGS
648
649Report bugs to Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
650
651=head1 COPYRIGHT
652
653Copyright (c) 2016-2019 by Mauro Carvalho Chehab <mchehab+samsung@kernel.org>.
654
655License GPLv2: GNU GPL version 2 <http://gnu.org/licenses/gpl.html>.
656
657This is free software: you are free to change and redistribute it.
658There is NO WARRANTY, to the extent permitted by law.
659
660=cut
661