288 lines
7.3 KiB
Perl
288 lines
7.3 KiB
Perl
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#!/usr/bin/perl -w
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#
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# Note: You might need to install the Verilog::VCD package using CPAN..
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use strict;
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use Data::Dumper;
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use Verilog::VCD qw(parse_vcd list_sigs);
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$| = 1;
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my $opt_width = 0;
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my $opt_delay = 0;
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while (1)
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{
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if ($ARGV[0] eq '-w') {
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$opt_width = +$ARGV[1];
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shift @ARGV;
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shift @ARGV;
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next;
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}
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if ($ARGV[0] eq '-d') {
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$opt_delay = +$ARGV[1];
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shift @ARGV;
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shift @ARGV;
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next;
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}
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last;
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}
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if ($#ARGV != 1) {
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print STDERR "\n";
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print STDERR "VCDCD - Value Change Dump Change Dumper\n";
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print STDERR "\n";
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print STDERR "Usage: $0 [-w N] [-d N] gold.vcd gate.vcd\n";
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print STDERR "\n";
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print STDERR " -w N\n";
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print STDERR " reserve N characters for bitmap in text output (default: auto)\n";
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print STDERR "\n";
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print STDERR " -d N\n";
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print STDERR " allow for N timesteps delay between gate and gold (default: 0)\n";
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print STDERR "\n";
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print STDERR "Compare a known-good (gold) vcd file with a second (gate) vcd file.\n";
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print STDERR "This is not very efficient -- so use with care on large vcd files.\n";
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print STDERR "\n";
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exit 1;
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}
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my $fn_gold = $ARGV[0];
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my $fn_gate = $ARGV[1];
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print "Finding common signals..\n";
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my @gold_signals = list_sigs($fn_gold);
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my @gate_signals = list_sigs($fn_gate);
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my %gold_signals_hash;
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my %gate_signals_hash;
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for (@gold_signals) {
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my $fullname = $_;
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s/(\[([0-9]+|[0-9]+:[0-9]+)\])$//;
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$gold_signals_hash{$_}->{$fullname} = 1 unless /(^|\.)_[0-9]+_/;
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}
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for (@gate_signals) {
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my $fullname = $_;
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s/(\[([0-9]+|[0-9]+:[0-9]+)\])$//;
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$gate_signals_hash{$_}->{$fullname} = 1 unless /(^|\.)_[0-9]+_/;
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}
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my @signals;
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for my $net (sort keys %gold_signals_hash) {
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next unless exists $gate_signals_hash{$net};
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# next unless $net eq "tst_bench_top.i2c_top.byte_controller.bit_controller.cnt";
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my %orig_net_names;
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print "common signal: $net";
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for my $fullname (keys $gold_signals_hash{$net}) {
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$orig_net_names{$fullname} = 1;
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}
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for my $fullname (keys $gate_signals_hash{$net}) {
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$orig_net_names{$fullname} = 1;
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}
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for my $net (sort keys %orig_net_names) {
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push @signals, $net;
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print " $1" if /(\[([0-9]+|[0-9]+:[0-9]+)\])$/;
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}
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print "\n";
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}
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print "Loading gold vcd data..\n";
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my $vcd_gold = parse_vcd($fn_gold, {siglist => \@signals});
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print "Loading gate vcd data..\n";
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my $vcd_gate = parse_vcd($fn_gate, {siglist => \@signals});
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# print Dumper($vcd_gold);
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# print Dumper($vcd_gate);
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my %times;
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my $signal_maxlen = 8;
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my $data_gold = { };
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my $data_gate = { };
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sub checklen($$)
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{
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my ($net, $val) = @_;
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my $thislen = length $val;
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$thislen += $1 if $net =~ /\[([0-9]+)\]$/;
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$thislen += $1 if $net =~ /\[([0-9]+):[0-9]+\]$/;
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$signal_maxlen = $thislen if $signal_maxlen < $thislen;
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}
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print "Processing gold vcd data..\n";
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for my $key (keys %$vcd_gold) {
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for my $net (@{$vcd_gold->{$key}->{'nets'}}) {
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my $netname = $net->{'hier'} . "." . $net->{'name'};
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for my $tv (@{$vcd_gold->{$key}->{'tv'}}) {
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my $time = int($tv->[0]);
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my $value = $tv->[1];
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checklen($netname, $value);
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$data_gold->{$time}->{$netname} = $value;
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$times{$time} = 1;
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}
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}
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}
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print "Processing gate vcd data..\n";
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for my $key (keys %$vcd_gate) {
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for my $net (@{$vcd_gate->{$key}->{'nets'}}) {
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my $netname = $net->{'hier'} . "." . $net->{'name'};
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for my $tv (@{$vcd_gate->{$key}->{'tv'}}) {
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my $time = int($tv->[0]);
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my $value = $tv->[1];
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checklen($netname, $value);
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$data_gate->{$time}->{$netname} = $value;
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$times{$time} = 1;
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}
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}
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}
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$signal_maxlen = $opt_width if $opt_width > 0;
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my $diffcount = 0;
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my %state_gold;
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my %state_gate;
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my %signal_sync;
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my %touched_nets;
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sub set_state_bit($$$$)
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{
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my ($state, $net, $bit, $value) = @_;
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my @data;
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@data = split //, $state->{$net} if exists $state->{$net};
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unshift @data, "-" while $#data < $bit;
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$data[$#data - $bit] = $value;
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$state->{$net} = join "", @data;
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$signal_sync{$net} = 1 unless exists $signal_sync{$net};
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$touched_nets{$net} = 1;
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}
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sub set_state($$$)
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{
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my ($state, $net, $value) = @_;
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if ($net =~ /(.*)\[([0-9]+)\]$/) {
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set_state_bit($state, $1, $2, $value);
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return;
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}
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if ($net =~ /(.*)\[([0-9]+):([0-9]+)\]$/) {
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my ($n, $u, $d) = ($1, $2, $3);
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my @bits = split //, $value;
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my $extbit = $bits[0] eq "1" ? "0" : $bits[0];
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unshift @bits, $extbit while $#bits < $u - $d;
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set_state_bit($state, $n, $u--, shift @bits) while $u >= $d;
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return;
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}
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$state->{$net} = $value;
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$signal_sync{$net} = 1 unless exists $signal_sync{$net};
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$touched_nets{$net} = 1;
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}
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sub cmp_signal($$)
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{
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my ($a, $b) = @_;
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return 1 if $a eq $b;
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my @a = split //, $a;
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my @b = split //, $b;
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my $trail_a = $#a < 0 ? '-' : $a[0] eq '1' ? '0' : $a[0];
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my $trail_b = $#b < 0 ? '-' : $b[0] eq '1' ? '0' : $b[0];
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unshift @a, $trail_a while $#a < $#b;
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unshift @b, $trail_b while $#b < $#a;
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for (my $i = 0; $i <= $#a; $i++) {
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next if $a[$i] eq "-" || $b[$i] eq "-";
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return 0 if $a[$i] ne "x" && $a[$i] ne $b[$i];
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}
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return 1;
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}
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# Message objects: .text, .time, .signal, .sync
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my @messages;
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print "Comparing vcd data..\n";
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for my $time (sort { $a <=> $b } keys %times)
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{
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%touched_nets = ();
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for my $net (keys %{$data_gold->{$time}}) {
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set_state(\%state_gold, $net, $data_gold->{$time}->{$net});
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}
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for my $net (keys %{$data_gate->{$time}}) {
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set_state(\%state_gate, $net, $data_gate->{$time}->{$net});
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}
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for my $net (sort keys %touched_nets) {
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my ($stgo, $stga) = ('-', '-');
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$stgo = $state_gold{$net} if exists $state_gold{$net};
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$stga = $state_gate{$net} if exists $state_gate{$net};
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if (cmp_signal($stgo, $stga)) {
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next if $signal_sync{$net};
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my $message = { };
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$message->{text} = sprintf "%-10s %-20d %-*s %-*s %s\n", "<sync>", $time, $signal_maxlen, $stgo, $signal_maxlen, $stga, $net;
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$message->{time} = $time;
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$message->{signal} = $net;
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$message->{sync} = 1;
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push @messages, $message;
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$signal_sync{$net} = 1;
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} else {
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my $message = { };
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$message->{text} = sprintf "%-10d %-20d %-*s %-*s %s\n", $diffcount, $time, $signal_maxlen, $stgo, $signal_maxlen, $stga, $net;
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$message->{time} = $time;
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$message->{signal} = $net;
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$message->{sync} = 0;
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push @messages, $message;
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$signal_sync{$net} = 0;
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$diffcount++;
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}
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}
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}
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print "Found $diffcount differences.\n";
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if ($opt_delay > 0) {
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my %per_net_history;
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my $removed_diff_count = 0;
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for (my $i = 0; $i <= $#messages; $i++) {
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my $message = $messages[$i];
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$message->{deleted} = 0;
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$per_net_history{$message->{signal}} = [ ] unless exists $per_net_history{$message->{signal}};
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if ($message->{sync}) {
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my $deleted_all = 1;
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for my $j (@{$per_net_history{$message->{signal}}}) {
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my $m = $messages[$j];
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if ($m->{time} + $opt_delay >= $message->{time}) {
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$m->{deleted} = 1;
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$removed_diff_count++;
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} else {
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$deleted_all = 0;
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}
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}
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$message->{deleted} = 1 if $deleted_all;
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$per_net_history{$message->{signal}} = [ ];
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} else {
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push @{$per_net_history{$message->{signal}}}, $i;
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}
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}
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my @new_messages;
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for my $message (@messages) {
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push @new_messages, $message unless $message->{deleted};
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}
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@messages = @new_messages;
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printf "Removed %d differences using delay filtering.\n", $removed_diff_count;
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$diffcount = $diffcount - $removed_diff_count;
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}
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if ($#messages >= 0) {
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printf "\n%-10s %-20s %-*s %-*s %s\n", "count", "time", $signal_maxlen, "gold", $signal_maxlen, "gate", "net" if $diffcount++ == 0;
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for (my $i = 0; $i <= $#messages; $i++) {
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printf "%s", $messages[$i]->{text};
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}
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}
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exit ($diffcount > 0 ? 1 : 0);
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