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#!/usr/bin/perl -w
# find a list of #include lines in C code that might not be needed
# usually called with something like this:
# minimal_includes.pl `find . -name "*.c"`
# Andrew Tridgell <tridge@samba.org>
use strict;
use Data::Dumper;
use Getopt::Long;
my $opt_help = 0;
my $opt_remove = 0;
my $opt_skip_system = 0;
#####################################################################
# write a string into a file
sub FileSave($$)
{
my($filename) = shift;
my($v) = shift;
local(*FILE);
open(FILE, ">$filename") || die "can't open $filename";
print FILE $v;
close(FILE);
}
sub load_lines($)
{
my $fname = shift;
my @lines = split(/^/m, `cat $fname`);
return @lines;
}
sub save_lines($$)
{
my $fname = shift;
my $lines = shift;
my $data = join('', @{$lines});
FileSave($fname, $data);
}
sub test_compile($)
{
my $fname = shift;
my $obj;
if ($fname =~ s/(.*)\..*$/$1.o/) {
$obj = "$1.o";
} else {
return "NOT A C FILE";
}
unlink($obj);
my $ret = `make $obj 2>&1`;
if (!unlink("$obj")) {
return "COMPILE FAILED";
}
return $ret;
}
sub test_include($$$$)
{
my $fname = shift;
my $lines = shift;
my $i = shift;
my $original = shift;
my $line = $lines->[$i];
my $testfname;
$lines->[$i] = "";
my $mname = $fname . ".misaved";
unlink($mname);
rename($fname, $mname) || die "failed to rename $fname";
save_lines($fname, $lines);
my $out = test_compile($fname);
if ($out eq $original) {
if ($opt_remove) {
if ($opt_skip_system &&
$line =~ /system\//) {
print "$fname: not removing system include $line\n";
} else {
print "$fname: removing $line\n";
unlink($mname);
return;
}
} else {
print "$fname: might be able to remove $line\n";
}
}
$lines->[$i] = $line;
rename($mname, $fname) || die "failed to restore $fname";
}
sub process_file($)
{
my $fname = shift;
my @lines = load_lines($fname);
my $num_lines = $#lines;
my $original = test_compile($fname);
if ($original eq "COMPILE FAILED") {
print "Failed to compile $fname\n";
return;
}
print "Processing $fname (with $num_lines lines)\n";
my $if_level = 0;
for (my $i=0;$i<=$num_lines;$i++) {
my $line = $lines[$i];
if ($line =~ /^\#\s*if/) {
$if_level++;
}
if ($line =~ /^\#\s*endif/) {
$if_level--;
}
if ($if_level == 0 &&
$line =~ /^\#\s*include/ &&
!($line =~ /needed/)) {
test_include($fname, \@lines, $i, $original);
}
}
}
#########################################
# display help text
sub ShowHelp()
{
print "
minimise includes
Copyright (C) tridge\@samba.org
Usage: minimal_includes.pl [options] <C files....>
Options:
--help show help
--remove remove includes, don't just list them
--skip-system don't remove system/ includes
";
}
# main program
GetOptions (
'h|help|?' => \$opt_help,
'remove' => \$opt_remove,
'skip-system' => \$opt_skip_system,
);
if ($opt_help) {
ShowHelp();
exit(0);
}
for (my $i=0;$i<=$#ARGV;$i++) {
my $fname = $ARGV[$i];
process_file($fname);
}
|
