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kbuild: add headerdep used to detect inclusion cycles in header files
Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
This commit is contained in:
Vegard Nossum
Sam Ravnborg
parent
a6ba0cb35d
commit
179efcb47d
7
Makefile
7
Makefile
@ -1026,6 +1026,10 @@ include/linux/version.h: $(srctree)/Makefile FORCE
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include/linux/utsrelease.h: include/config/kernel.release FORCE
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$(call filechk,utsrelease.h)
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PHONY += headerdep
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headerdep:
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$(Q)find include/ -name '*.h' | xargs --max-args 1 scripts/headerdep.pl
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# ---------------------------------------------------------------------------
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PHONY += depend dep
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@ -1274,7 +1278,8 @@ help:
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@echo ' versioncheck - Sanity check on version.h usage'
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@echo ' includecheck - Check for duplicate included header files'
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@echo ' export_report - List the usages of all exported symbols'
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@echo ' headers_check - Sanity check on exported headers'; \
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@echo ' headers_check - Sanity check on exported headers'
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@echo ' headerdep - Detect inclusion cycles in headers'; \
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echo ''
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@echo 'Kernel packaging:'
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@$(MAKE) $(build)=$(package-dir) help
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193
scripts/headerdep.pl
Executable file
193
scripts/headerdep.pl
Executable file
@ -0,0 +1,193 @@
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#! /usr/bin/perl
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#
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# Detect cycles in the header file dependency graph
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# Vegard Nossum <vegardno@ifi.uio.no>
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#
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use strict;
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use warnings;
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use Getopt::Long;
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my $opt_all;
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my @opt_include;
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my $opt_graph;
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&Getopt::Long::Configure(qw(bundling pass_through));
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&GetOptions(
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help => \&help,
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version => \&version,
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all => \$opt_all,
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I => \@opt_include,
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graph => \$opt_graph,
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);
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push @opt_include, 'include';
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my %deps = ();
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my %linenos = ();
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my @headers = grep { strip($_) } @ARGV;
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parse_all(@headers);
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if($opt_graph) {
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graph();
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} else {
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detect_cycles(@headers);
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}
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sub help {
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print "Usage: $0 [options] file...\n";
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print "\n";
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print "Options:\n";
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print " --all\n";
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print " --graph\n";
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print "\n";
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print " -I includedir\n";
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print "\n";
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print "To make nice graphs, try:\n";
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print " $0 --graph include/linux/kernel.h | dot -Tpng -o graph.png\n";
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exit;
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}
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sub version {
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print "headerdep version 2\n";
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exit;
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}
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# Get a file name that is relative to our include paths
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sub strip {
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my $filename = shift;
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for my $i (@opt_include) {
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my $stripped = $filename;
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$stripped =~ s/^$i\///;
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return $stripped if $stripped ne $filename;
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}
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return $filename;
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}
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# Search for the file name in the list of include paths
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sub search {
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my $filename = shift;
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return $filename if -f $filename;
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for my $i (@opt_include) {
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my $path = "$i/$filename";
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return $path if -f $path;
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}
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return undef;
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}
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sub parse_all {
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# Parse all the headers.
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my @queue = @_;
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while(@queue) {
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my $header = pop @queue;
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next if exists $deps{$header};
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$deps{$header} = [] unless exists $deps{$header};
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my $path = search($header);
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next unless $path;
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open(my $file, '<', $path) or die($!);
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chomp(my @lines = <$file>);
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close($file);
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for my $i (0 .. $#lines) {
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my $line = $lines[$i];
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if(my($dep) = ($line =~ m/^#\s*include\s*<(.*?)>/)) {
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push @queue, $dep;
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push @{$deps{$header}}, [$i + 1, $dep];
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}
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}
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}
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}
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sub print_cycle {
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# $cycle[n] includes $cycle[n + 1];
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# $cycle[-1] will be the culprit
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my $cycle = shift;
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# Adjust the line numbers
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for my $i (0 .. $#$cycle - 1) {
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$cycle->[$i]->[0] = $cycle->[$i + 1]->[0];
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}
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$cycle->[-1]->[0] = 0;
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my $first = shift @$cycle;
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my $last = pop @$cycle;
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my $msg = "In file included";
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printf "%s from %s,\n", $msg, $last->[1] if defined $last;
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for my $header (reverse @$cycle) {
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printf "%s from %s:%d%s\n",
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" " x length $msg,
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$header->[1], $header->[0],
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$header->[1] eq $last->[1] ? ' <-- here' : '';
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}
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printf "%s:%d: warning: recursive header inclusion\n",
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$first->[1], $first->[0];
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}
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# Find and print the smallest cycle starting in the specified node.
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sub detect_cycles {
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my @queue = map { [[0, $_]] } @_;
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while(@queue) {
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my $top = pop @queue;
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my $name = $top->[-1]->[1];
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for my $dep (@{$deps{$name}}) {
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my $chain = [@$top, [$dep->[0], $dep->[1]]];
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# If the dep already exists in the chain, we have a
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# cycle...
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if(grep { $_->[1] eq $dep->[1] } @$top) {
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print_cycle($chain);
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next if $opt_all;
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return;
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}
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push @queue, $chain;
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}
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}
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}
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sub mangle {
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$_ = shift;
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s/\//__/g;
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s/\./_/g;
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s/-/_/g;
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$_;
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}
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# Output dependency graph in GraphViz language.
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sub graph {
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print "digraph {\n";
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print "\t/* vertices */\n";
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for my $header (keys %deps) {
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printf "\t%s [label=\"%s\"];\n",
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mangle($header), $header;
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}
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print "\n";
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print "\t/* edges */\n";
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for my $header (keys %deps) {
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for my $dep (@{$deps{$header}}) {
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printf "\t%s -> %s;\n",
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mangle($header), mangle($dep->[1]);
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}
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}
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print "}\n";
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}
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