xcodescripts/generate_features.pl

   1 #!/usr/bin/perl
   2
   3 # Generates the libc-features.h files used to control #ifdef behaviour in Libc
   4 use warnings;
   5 use Data::Dumper;
   6 use File::Path qw(mkpath);
   7
   8 #printf Dumper(\%ENV);
   9
  10 my $unifdef = 0;
  11 my %unifdefs = ();
  12 my $bash = 0;
  13 if (scalar(@ARGV) > 0) {
  14         $unifdef = 1 if $ARGV[0] =~ /--unifdef/;
  15         $bash = 1 if $ARGV[0] =~ /--bash/;
  16 }
  17
  18 for my $arch (split(/ /, $ENV{"ARCHS"}))
  19 {
  20         # set ENV{"CURRENT_ARCH"} so we can predicate on it
  21         $ENV{"CURRENT_ARCH"} = $arch;
  22
  23         my $platformName = $ENV{"VARIANT_PLATFORM_NAME"};
  24         $platformName =~ s/simulator/os/;
  25
  26         # Try to find a platform+arch config file. If not found, try just
  27         # a platform config file.
  28         my $platformArchPath = $ENV{"SRCROOT"} . "/Platforms/" . $platformName . "/Makefile." . $arch . ".inc";
  29         my $platformPath = $ENV{"SRCROOT"} . "/Platforms/" . $platformName . "/Makefile.inc";
  30
  31         my $featuresHeaderDir = $ENV{"DERIVED_FILES_DIR"}."/".$arch;
  32         my $featuresHeader = $featuresHeaderDir."/libc-features.h";
  33
  34         open FEATURESFILE, "<$platformArchPath" or open FEATURESFILE, "<$platformPath" or die "Unable to open: $platformArchPath nor $platformPath";
  35
  36         my %features = ();
  37         my $skip = 0;
  38         my $nested = 0;
  39
  40         while (<FEATURESFILE>) {
  41                 next if $_ =~ /\s*#/;
  42
  43                 if ($_ =~ /^.endif/) {
  44                         $skip-- if $skip > 0;
  45                         $nested--;
  46                 }
  47
  48                 elsif ($_ =~ /^\.if\s+(\S+)\s+(\S+)/) {
  49                         # an if statement, very rudimentary regex against envvar
  50                         my $envvar = $1;
  51                         my $regex = $2;
  52
  53                         $nested++;
  54                         if (!defined($ENV{$envvar}) || ($ENV{$envvar} !~ /$regex/)) {
  55                                 $skip += 1;
  56                         }
  57                 }
  58
  59                 elsif ($_ =~ /^\s*([^= ]+)\s*=\s*(\d)/) {
  60                         if ($skip == 0) {
  61                                 if ($2 == 1) {
  62                                         $features{$1} = $2;
  63                                 } elsif (defined($features{$1})) {
  64                                         delete $features{$1};
  65                                 }
  66                         }
  67                 }
  68         }
  69
  70         close FEATURESFILE;
  71
  72         if ($bash == 1) {
  73                 for my $f (keys %features) {
  74                         print "$f=$features{$f} ";
  75                 }
  76                 printf "\n";
  77                 exit 0;
  78         }
  79
  80         elsif ($unifdef == 1) {
  81                 # assume FEATURE_BLOCKS was on by default
  82                 $unifdefs{"UNIFDEF_BLOCKS"} = 1;
  83                 $unifdefs{"UNIFDEF_DRIVERKIT"} = defined($ENV{"DRIVERKITSDK"});
  84                 $unifdefs{"UNIFDEF_LEGACY_64_APIS"} = defined($features{"FEATURE_LEGACY_64_APIS"});
  85                 $unifdefs{"UNIFDEF_LEGACY_RUNE_APIS"} = defined($features{"FEATURE_LEGACY_RUNE_APIS"});
  86                 $unifdefs{"UNIFDEF_LEGACY_UTMP_APIS"} = defined($features{"FEATURE_LEGACY_UTMP_APIS"});
  87                 $unifdefs{"UNIFDEF_POSIX_ILP32_ALLOW"} = defined($features{"FEATURE_POSIX_ILP32_ALLOW"});
  88
  89                 my $output = "";
  90                 for my $d (keys %unifdefs) {
  91                         $output .= " " . ($unifdefs{$d} == 1 ? "-D" : "-U") . $d;
  92                 }
  93
  94                 chomp $output;
  95                 print "$output\n";
  96                 exit 0;
  97         }
  98
  99         elsif ($unifdef == 0) {
 100                 # If we touch this file on every build, then every other iterative build in Xcode will rebuild *everything*
 101                 my $platform_mtime = (stat($platformArchPath))[9];
 102                 if (!defined($platform_mtime)) {
 103                         # try the other one
 104                         $platform_mtime = (stat($platformPath))[9];
 105                 }
 106                 my $header_mtime = (stat($featuresHeader))[9];
 107
 108                 if (defined($header_mtime) && defined($platform_mtime) && ($header_mtime > $platform_mtime)) {
 109                         exit 0;
 110                 }
 111
 112                 printf $arch." features:\n";
 113                 printf Dumper(\%features);
 114
 115                 if ($nested != 0) {
 116                         die "Unbalanced .if/.endif directive";
 117                 }
 118
 119                 # And the meat, new header options should go under here
 120                 if (! -d $featuresHeaderDir) {
 121                         mkpath $featuresHeaderDir or die "Unable to mkdir: $featuresHeaderDir";
 122                 }
 123                 open HEADER, ">$featuresHeader" or die "Unable to open (for writing): $featuresHeader";
 124
 125                 printf HEADER "#ifndef _LIBC_FEATURES_H_\n";
 126                 printf HEADER "#define _LIBC_FEATURES_H_\n\n";
 127
 128                 my $shortarch = $arch;
 129                 $shortarch =~ s/armv\d+[a-z]?/arm/g;
 130
 131                 # map all arm64 subtypes to arm64
 132                 $shortarch =~ s/arm64[_a-z0-9]*/arm64/g;
 133
 134                 printf HEADER "#if !defined(__".$shortarch."__)\n";
 135                 printf HEADER "#error Mismatched libc-features.h architecture\n";
 136                 printf HEADER "#endif\n\n";
 137
 138                 if (defined($features{"FEATURE_LEGACY_RUNE_APIS"})) {
 139                         printf HEADER "#define UNIFDEF_LEGACY_RUNE_APIS 1\n";
 140                 } else {
 141                         printf HEADER "/* #undef UNIFDEF_LEGACY_RUNE_APIS */\n";
 142                 }
 143
 144                 if (defined($features{"FEATURE_LEGACY_CRT1_ENVIRON"})) {
 145                         printf HEADER "#define LEGACY_CRT1_ENVIRON 1\n";
 146                 } else {
 147                         printf HEADER "/* #undef LEGACY_CRT1_ENVIRON */\n";
 148                 }
 149
 150                 if (defined($features{"FEATURE_LEGACY_UTMP_APIS"})) {
 151                         printf HEADER "#define UNIFDEF_LEGACY_UTMP_APIS 1\n";
 152                 } else {
 153                         printf HEADER "/* #undef UNIFDEF_LEGACY_UTMP_APIS */\n";
 154                 }
 155
 156                 if (defined($features{"FEATURE_ONLY_1050_VARIANTS"})) {
 157                         printf HEADER "#if !__DARWIN_ONLY_VERS_1050\n";
 158                         printf HEADER "#  error Feature mismatch: __DARWIN_ONLY_VERS_1050 == 0\n";
 159                         printf HEADER "#endif /* !__DARWIN_ONLY_VERS_1050 */\n";
 160                 } else {
 161                         printf HEADER "#if __DARWIN_ONLY_VERS_1050\n";
 162                         printf HEADER "#  error Feature mismatch: __DARWIN_ONLY_VERS_1050 == 1\n";
 163                         printf HEADER "#endif /* __DARWIN_ONLY_VERS_1050 */\n";
 164                 }
 165
 166                 if (defined($features{"FEATURE_ONLY_UNIX_CONFORMANCE"})) {
 167                         printf HEADER "#if !__DARWIN_ONLY_UNIX_CONFORMANCE\n";
 168                         printf HEADER "#  error Feature mismatch: __DARWIN_ONLY_UNIX_CONFORMANCE == 0\n";
 169                         printf HEADER "#endif /* !__DARWIN_ONLY_UNIX_CONFORMANCE */\n";
 170                 } else {
 171                         printf HEADER "#if __DARWIN_ONLY_UNIX_CONFORMANCE\n";
 172                         printf HEADER "#  error Feature mismatch: __DARWIN_ONLY_UNIX_CONFORMANCE == 1\n";
 173                         printf HEADER "#endif /* __DARWIN_ONLY_UNIX_CONFORMANCE */\n";
 174                 }
 175
 176                 if (defined($features{"FEATURE_ONLY_64_BIT_INO_T"})) {
 177                         printf HEADER "#if !__DARWIN_ONLY_64_BIT_INO_T\n";
 178                         printf HEADER "#  error Feature mismatch: __DARWIN_ONLY_64_BIT_INO_T == 0\n";
 179                         printf HEADER "#endif /* !__DARWIN_ONLY_64_BIT_INO_T */\n";
 180                 } else {
 181                         printf HEADER "#if __DARWIN_ONLY_64_BIT_INO_T\n";
 182                         printf HEADER "#  error Feature mismatch: __DARWIN_ONLY_64_BIT_INO_T == 1\n";
 183                         printf HEADER "#endif /* __DARWIN_ONLY_64_BIT_INO_T */\n";
 184                 }
 185
 186                 if (defined($features{"FEATURE_PATCH_3417676"})) {
 187                         printf HEADER "#define __APPLE_PR3417676_HACK__ 1\n";
 188                 } else {
 189                         printf HEADER "/* #undef __APPLE_PR3417676_HACK__ */\n";
 190                 }
 191
 192                 if (defined($features{"FEATURE_PLOCKSTAT"})) {
 193                         printf HEADER "#define PLOCKSTAT 1\n";
 194                 } else {
 195                         printf HEADER "/* #undef PLOCKSTAT */\n";
 196                 }
 197
 198                 if (defined($features{"FEATURE_TIMEZONE_CHANGE_NOTIFICATION"})) {
 199                         printf HEADER "#define NOTIFY_TZ 1\n";
 200                 } else {
 201                         printf HEADER "/* #undef NOTIFY_TZ */\n";
 202                 }
 203
 204                 if (defined($features{"FEATURE_SMALL_STDIOBUF"})) {
 205                         printf HEADER "#define FEATURE_SMALL_STDIOBUF 1\n";
 206                 } else {
 207                         printf HEADER "/* #undef FEATURE_SMALL_STDIOBUF */\n";
 208                 }
 209
 210                 if (defined($features{"FEATURE_XPRINTF_PERF"})) {
 211                         printf HEADER "#define XPRINTF_PERF 1\n";
 212                 } else {
 213                         printf HEADER "/* #undef XPRINTF_PERF */\n";
 214                 }
 215
 216                 if (defined($features{"FEATURE_SIGNAL_RESTRICTION"})) {
 217                         printf HEADER "#define FEATURE_SIGNAL_RESTRICTION 1\n";
 218                 } else {
 219                         printf HEADER "/* #undef FEATURE_SIGNAL_RESTRICTION */\n";
 220                 }
 221
 222                 printf HEADER "#endif // _LIBC_FEATURES_H_\n";
 223                 close HEADER;
 224         }
 225 }
 226
 227 exit 0;