1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
#!/usr/bin/env perl
#
# Clean up include guards in headers
#
# Copyright (C) 2016 Red Hat, Inc.
#
# Authors:
# Markus Armbruster <armbru@redhat.com>
#
# This work is licensed under the terms of the GNU GPL, version 2 or
# (at your option) any later version. See the COPYING file in the
# top-level directory.
#
# Usage: scripts/clean-header-guards.pl [OPTION]... [FILE]...
# -c CC Use a compiler other than cc
# -n Suppress actual cleanup
# -v Show which files are cleaned up, and which are skipped
#
# Does the following:
# - Header files without a recognizable header guard are skipped.
# - Clean up any untidy header guards in-place. Warn if the cleanup
# renames guard symbols, and explain how to find occurences of these
# symbols that may have to be updated manually.
# - Warn about duplicate header guard symbols. To make full use of
# this warning, you should clean up *all* headers in one run.
# - Warn when preprocessing a header with its guard symbol defined
# produces anything but whitespace. The preprocessor is run like
# "cc -E -DGUARD_H -c -P -", and fed the test program on stdin.
use strict;
use warnings;
use Getopt::Std;
# Stuff we don't want to clean because we import it into our tree:
my $exclude = qr,^(disas/libvixl/|include/standard-headers/
|linux-headers/|pc-bios/|tests/tcg/|tests/multiboot/),x;
# Stuff that is expected to fail the preprocessing test:
my $exclude_cpp = qr,^include/libdecnumber/decNumberLocal.h,;
my %guarded = ();
my %old_guard = ();
our $opt_c = "cc";
our $opt_n = 0;
our $opt_v = 0;
getopts("c:nv");
sub skipping {
my ($fname, $msg, $line1, $line2) = @_;
return if !$opt_v or $fname =~ $exclude;
print "$fname skipped: $msg\n";
print " $line1" if defined $line1;
print " $line2" if defined $line2;
}
sub gripe {
my ($fname, $msg) = @_;
return if $fname =~ $exclude;
print STDERR "$fname: warning: $msg\n";
}
sub slurp {
my ($fname) = @_;
local $/; # slurp
open(my $in, "<", $fname)
or die "can't open $fname for reading: $!";
return <$in>;
}
sub unslurp {
my ($fname, $contents) = @_;
open (my $out, ">", $fname)
or die "can't open $fname for writing: $!";
print $out $contents
or die "error writing $fname: $!";
close $out
or die "error writing $fname: $!";
}
sub fname2guard {
my ($fname) = @_;
$fname =~ tr/a-z/A-Z/;
$fname =~ tr/A-Z0-9/_/cs;
return $fname;
}
sub preprocess {
my ($fname, $guard) = @_;
open(my $pipe, "-|", "$opt_c -E -D$guard -c -P - <$fname")
or die "can't run $opt_c: $!";
while (<$pipe>) {
if ($_ =~ /\S/) {
gripe($fname, "not blank after preprocessing");
last;
}
}
close $pipe
or gripe($fname, "preprocessing failed ($opt_c exit status $?)");
}
for my $fname (@ARGV) {
my $text = slurp($fname);
$text =~ m,\A(\s*\n|\s*//\N*\n|\s*/\*.*?\*/\s*\n)*|,msg;
my $pre = $&;
unless ($text =~ /\G(.*\n)/g) {
$text =~ /\G.*/;
skipping($fname, "no recognizable header guard", "$&\n");
next;
}
my $line1 = $1;
unless ($text =~ /\G(.*\n)/g) {
$text =~ /\G.*/;
skipping($fname, "no recognizable header guard", "$&\n");
next;
}
my $line2 = $1;
my $body = substr($text, pos($text));
unless ($line1 =~ /^\s*\#\s*(if\s*\!\s*defined(\s*\()?|ifndef)\s*
([A-Za-z0-9_]+)/x) {
skipping($fname, "no recognizable header guard", $line1, $line2);
next;
}
my $guard = $3;
unless ($line2 =~ /^\s*\#\s*define\s+([A-Za-z0-9_]+)/) {
skipping($fname, "no recognizable header guard", $line1, $line2);
next;
}
my $guard2 = $1;
unless ($guard2 eq $guard) {
skipping($fname, "mismatched header guard ($guard vs. $guard2) ",
$line1, $line2);
next;
}
unless ($body =~ m,\A((.*\n)*)
(\s*\#\s*endif\s*(/\*\s*.*\s*\*/\s*)?\n?)
(\n|\s)*\Z,x) {
skipping($fname, "can't find end of header guard");
next;
}
$body = $1;
my $line3 = $3;
my $endif_comment = $4;
my $oldg = $guard;
unless ($fname =~ $exclude) {
my @issues = ();
$guard =~ tr/a-z/A-Z/
and push @issues, "contains lowercase letters";
$guard =~ s/^_+//
and push @issues, "is a reserved identifier";
$guard =~ s/(_H)?_*$/_H/
and $& ne "_H" and push @issues, "doesn't end with _H";
unless ($guard =~ /^[A-Z][A-Z0-9_]*_H/) {
skipping($fname, "can't clean up odd guard symbol $oldg\n",
$line1, $line2);
next;
}
my $exp = fname2guard($fname =~ s,.*/,,r);
unless ($guard =~ /\Q$exp\E\Z/) {
$guard = fname2guard($fname =~ s,^include/,,r);
push @issues, "doesn't match the file name";
}
if (@issues and $opt_v) {
print "$fname guard $oldg needs cleanup:\n ",
join(", ", @issues), "\n";
}
}
$old_guard{$guard} = $oldg
if $guard ne $oldg;
if (exists $guarded{$guard}) {
gripe($fname, "guard $guard also used by $guarded{$guard}");
} else {
$guarded{$guard} = $fname;
}
unless ($fname =~ $exclude) {
my $newl1 = "#ifndef $guard\n";
my $newl2 = "#define $guard\n";
my $newl3 = "#endif\n";
$newl3 =~ s,\Z, /* $guard */, if defined $endif_comment;
if ($line1 ne $newl1 or $line2 ne $newl2 or $line3 ne $newl3) {
$pre =~ s/\n*\Z/\n\n/ if $pre =~ /\N/;
$body =~ s/\A\n*/\n/;
if ($opt_n) {
print "$fname would be cleaned up\n" if $opt_v;
} else {
unslurp($fname, "$pre$newl1$newl2$body$newl3");
print "$fname cleaned up\n" if $opt_v;
}
}
}
preprocess($fname, $opt_n ? $oldg : $guard)
unless $fname =~ $exclude or $fname =~ $exclude_cpp;
}
if (%old_guard) {
print STDERR "warning: guard symbol renaming may break things\n";
for my $guard (sort keys %old_guard) {
print STDERR " $old_guard{$guard} -> $guard\n";
}
print STDERR "To find uses that may have to be updated try:\n";
print STDERR " git grep -Ew '", join("|", sort values %old_guard),
"'\n";
}
|
