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270 lines
7.1 KiB
Perl
270 lines
7.1 KiB
Perl
#!/bin/env perl
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use strict;
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my $export_file;
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my @import_files;
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my $show_class_usage = 0;
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my $show_function_usage = 0;
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my $infrequent_use_threshold = 1;
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# first argument is the file that's exporting
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# all further arguments are the input files
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my $arg;
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foreach $arg (@ARGV) {
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if ($arg =~ /^-(.*)/) {
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$show_class_usage=1 if ($1 eq "c");
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$show_function_usage=1 if ($1 eq "f");
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}
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elsif (!$export_file) {
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$export_file = $arg;
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} else {
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push @import_files, $arg;
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}
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}
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if (!$export_file || $#import_files == -1) {
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print "$export_file, $#import_files\n";
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print "Usage: $ARGV[0] <exporter>.dll [ importer [ importer ..]]\n";
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print " Builds up a list of exporters from <exporter>.dll,\n";
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print " and then lists all exports that are rarely or never used.\n";
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exit;
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}
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open EXPORTS, "dumpbin /exports $export_file|";
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# $demangle{foo} is the demangled name of "foo"
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my %demangle;
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# $import_count{foo} is the number of exports of "foo"
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my %import_count;
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my %last_consumer_of;
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my $found_exports;
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while (<EXPORTS>) {
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# format is
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# ordinal hint RVA? name
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if ($found_exports) {
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# break up the words
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my @words = split /\s+/;
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next if ($#words != 4);
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my $ordinal = $words[1];
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my $name = $words[4];
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$import_count{$name} = 0;
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} elsif (/ordinal\s+hint\s+RVA/) {
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$found_exports = 1;
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}
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}
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close EXPORTS;
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#
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# now read in all imports, and ++ the imports from the exported file
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#
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my $filename;
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foreach $filename (@import_files) {
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print STDERR "gathering data for $filename\n";
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open IMPORTS, "dumpbin /imports $filename|";
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my $current_import_dll;
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my $awaiting_import_dll;
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my $importing_from;
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my $awaiting_import_header;
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while (<IMPORTS>) {
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chop;
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if (/Dump of file ([^\s]+)/) {
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$awaiting_import_dll = 0;
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$current_import_dll = $1;
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#print STDERR "Found imports for $current_import_dll\n";
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} elsif (/Section contains the following imports/) {
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$awaiting_import_dll = 1;
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} elsif ($awaiting_import_dll && /^\s+([\w\.]+)$/) {
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$importing_from = $1;
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$awaiting_import_dll = 0;
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$awaiting_import_header = 1;
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# print STDERR "$current_import_dll: Importing from $importing_from\n";
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} elsif ($awaiting_import_header) {
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if ($_ eq "") {
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$awaiting_import_header = 0;
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}
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# print STDERR "...Skipped past header, starting imports\n" if (!$awaiting_import_header);
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} else {
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if ($_ eq "") {
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$awaiting_import_dll = 1;
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next;
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}
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if ($export_file eq $importing_from) {
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# must be an import line
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my @imports = split /\s+/;
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next if ($#imports != 2);
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my $func = $imports[2];
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#print STDERR "... importing $func from $export_file\n";
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$import_count{$func}++;
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$last_consumer_of{$func} = $current_import_dll;
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# print STDERR "Got import $importing_from\[$imports[2]\]\n";
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}
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}
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}
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close IMPORTS;
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}
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my $func;
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my @funcs_to_demangle;
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print STDERR "finding infrequently imported symbols..\n";
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foreach $func (sort keys %import_count) {
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# we need to demangle all symbols if we're showing unused classes
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# otherwise, we only need to demangle infrequently-used symbols
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if ($show_class_usage ||
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$import_count{$func} <= $infrequent_use_threshold) {
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push @funcs_to_demangle, $func;
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} else {
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#print STDERR "Found $import_count{$func} consumers of $func\n";
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}
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}
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print STDERR "Demangling..$#funcs_to_demangle unused symbols\n";
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my $max_per_run = 20;
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my $demangle_queue;
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my $count = 0;
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while ($func = pop @funcs_to_demangle) {
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# skip functions that are used often
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#next if ($import_count{$func} > 1);
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$count++;
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$demangle_queue .= " $func";
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if ($count == $max_per_run || ($#funcs_to_demangle == 0)) {
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# set up the initial slot where the demangled name goes
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open UNDNAME, "undname -f $demangle_queue|";
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while (<UNDNAME>) {
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chop;
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# print STDERR "Got result $_\n";
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if (/\s*(\S+)\s*==\s*(.*)$/) {
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# print STDERR"succesfully demangled $1 to $2\n";
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$demangle{$1} = $2;
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} else {
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$demangle{$1} = $1;
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}
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}
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close UNDNAME;
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$demangle_queue = "";
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$count = 0;
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}
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}
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print STDERR "Done.\n";
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my %class_methods; # number of methods
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my %class_method_unused; # number of unused methods in this class
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my %class_method_infreq; # number of infrequently-used methods
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my %class_method_used; # number of used method
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my %multiple_consumers; # if a class is in here, it has multiple consumers
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my %last_consumer_of_class; # last DLL to use this class
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foreach $func (sort keys %demangle) {
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# skip vtables, they don't matter
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next if ($demangle{$func} =~ /vftable/);
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next if ($demangle{$func} =~ /vbtable/);
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my ($class) = ($demangle{$func} =~ /(\S+)::\S+/);
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# gather general class info, no matter what the usage
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if ($class) {
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$class_methods{$class}++;
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$multiple_consumers{$class} = 1 if ($import_count{$func} > 1);
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}
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# never used
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if ($import_count{$func} == 0) {
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$class_method_unused{$class}++ if ($class);
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print "$demangle{$func}: No importers\n" if ($show_function_usage);
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}
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# used, but only by a few consumers
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elsif ($import_count{$func} <= $infrequent_use_threshold) {
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print "$demangle{$func}: $import_count{$func} consumer(s) ($last_consumer_of{$func})\n" if ($show_function_usage);
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&gather_class_info($class, $func) if ($class);
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}
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# used by more than one consumer
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else {
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$class_method_used{$class}++ if ($class);
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}
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}
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&show_class_usage() if ($show_class_usage);
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sub show_class_usage() {
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print "Classes that might be worth trimming:\n";
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my $class;
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foreach $class (sort keys %class_methods) {
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# no methods are used
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if ($class_method_unused{$class} == $class_methods{$class}) {
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print "$class is never used! ($class_methods{$class} methods)\n";
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}
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# all methods are used
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elsif ($class_method_used{$class} == $class_methods{$class}) {
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# print "$class is well-used\n";
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}
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# only report classes that less than 50% used
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elsif ($class_method_unused{$class}*2 > $class_methods{$class}) {
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print "$class: $class_methods{$class} methods, mostly unused.\n";
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print " Used: $class_method_used{$class}";
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print " ($class_method_infreq{$class} are used by few consumers)"
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if ($class_method_infreq{$class});
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print "\n";
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print " Unused: $class_method_unused{$class}\n";
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if (!$multiple_consumers{$class}) {
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print " Suggest moving $class into $last_consumer_of_class{$class} (the only consumer)\n";
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}
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}
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}
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}
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sub gather_class_info() {
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my ($class, $func) = @_;
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$class_method_infreq{$class}++;
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$class_method_used{$class}++;
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# we rely on $infrequent_use_threshold being >= 1
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if ($import_count{$func} == 1) {
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# check to see if this class has multiple consumers
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if (!$multiple_consumers{$class} && !$last_consumer_of_class{$class}) {
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$last_consumer_of_class{$class} = $last_consumer_of{$func};
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# $multiple_consumers{$class} = 0;
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}
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elsif ($last_consumer_of_class{$class} ne $last_consumer_of{$func}) {
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# flag this to never match
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$multiple_consumers{$class} = 1;
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}
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}
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}
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