6 use constant WARNING_SIZE => 2048;
10 # Scan output of "nm -o -S bin/blib.a" and build up symbol table
14 ( my $object, undef, my $value, undef, my $size, my $type, my $symbol )
15 = /^.*?:(.*?\.o):((\S+)(\s+(\S+))?)?\s+(\S)\s+(\S+)$/;
16 $symtab->{$object}->{$symbol} = {
17 global => ( $type eq uc $type ),
19 value => ( $value ? hex ( $value ) : 0 ),
20 size => ( $size ? hex ( $size ) : 0 ),
24 # Add symbols that we know will be generated or required by the linker
26 foreach my $object ( keys %$symtab ) {
27 my $obj_symbol = "obj_$object";
28 $obj_symbol =~ s/\.o$//;
29 $obj_symbol =~ s/\W/_/g;
30 $symtab->{LINKER}->{$obj_symbol} = {
37 foreach my $link_sym qw ( _prefix _eprefix _decompress _edecompress _text
38 _etext _data _edata _bss _ebss _end ) {
39 $symtab->{LINKER}->{$link_sym} = {
47 # Build up requires and provides tables for global symbols
49 while ( ( my $object, my $symbols ) = each %$symtab ) {
50 while ( ( my $symbol, my $info ) = each %$symbols ) {
51 if ( $info->{global} ) {
52 my $category = ( ( $info->{type} eq 'U' ? "requires" : "provides" ) );
53 $globals->{$symbol}->{$category}->{$object} = 1;
58 # Check for multiply defined, never-defined and unused global symbols
61 while ( ( my $symbol, my $info ) = each %$globals ) {
62 my @provides = keys %{$info->{provides}};
63 my @requires = keys %{$info->{requires}};
65 if ( @provides == 0 ) {
66 # No object provides this symbol
67 $problems->{$_}->{nonexistent}->{$symbol} = 1 foreach @requires;
68 } elsif ( @provides > 1 ) {
69 # Symbol defined in multiple objects
70 $problems->{$_}->{multiples}->{$symbol} = 1 foreach @provides;
72 if ( @requires == 0 ) {
74 $problems->{$_}->{unused}->{$symbol} = 1 foreach @provides;
78 # Print out error messages
82 foreach my $object ( sort keys %$problems ) {
83 my @nonexistent = sort keys %{$problems->{$object}->{nonexistent}};
84 my @multiples = sort keys %{$problems->{$object}->{multiples}};
85 my @unused = sort keys %{$problems->{$object}->{unused}};
87 print "WARN $object provides unused symbol $_\n" foreach @unused;
89 print "ERR $object requires non-existent symbol $_\n" foreach @nonexistent;
90 $errors += @nonexistent;
91 foreach my $symbol ( @multiples ) {
92 my @other_objects = sort grep { $_ ne $object }
93 keys %{$globals->{$symbol}->{provides}};
94 print "ERR $object provides symbol $symbol"
95 ." (also provided by @other_objects)\n";
97 $errors += @multiples;
100 print "$errors error(s), $warnings warning(s)\n";
101 exit ( $errors ? 1 : 0 );