util/add-depends.pl

   1 #! /usr/bin/env perl
   2 # Copyright 2018 The OpenSSL Project Authors. All Rights Reserved.
   3 #
   4 # Licensed under the Apache License 2.0 (the "License").  You may not use
   5 # this file except in compliance with the License.  You can obtain a copy
   6 # in the file LICENSE in the source distribution or at
   7 # https://www.openssl.org/source/license.html
   8
   9 use strict;
  10 use warnings;
  11
  12 use lib '.';
  13 use configdata;
  14
  15 use File::Spec::Functions qw(:DEFAULT rel2abs);
  16 use File::Compare qw(compare_text);
  17 use feature 'state';
  18
  19 # When using stat() on Windows, we can get it to perform better by avoid some
  20 # data.  This doesn't affect the mtime field, so we're not losing anything...
  21 ${^WIN32_SLOPPY_STAT} = 1;
  22
  23 my $debug = $ENV{ADD_DEPENDS_DEBUG};
  24 my $buildfile = $config{build_file};
  25 my $build_mtime = (stat($buildfile))[9];
  26 my $rebuild = 0;
  27 my $depext = $target{dep_extension} || ".d";
  28 my @depfiles =
  29     sort
  30     grep {
  31         # This grep has side effects.  Not only does if check the existence
  32         # of the dependency file given in $_, but it also checks if it's
  33         # newer than the build file, and if it is, sets $rebuild.
  34         my @st = stat($_);
  35         $rebuild = 1 if @st && $st[9] > $build_mtime;
  36         scalar @st > 0;         # Determines the grep result
  37     }
  38     map { (my $x = $_) =~ s|\.o$|$depext|; $x; }
  39     ( ( grep { $unified_info{sources}->{$_}->[0] =~ /\.cc?$/ }
  40             keys %{$unified_info{sources}} ),
  41       ( grep { $unified_info{shared_sources}->{$_}->[0] =~ /\.cc?$/ }
  42             keys %{$unified_info{shared_sources}} ) );
  43
  44 exit 0 unless $rebuild;
  45
  46 # Ok, primary checks are done, time to do some real work
  47
  48 my $producer = shift @ARGV;
  49 die "Producer not given\n" unless $producer;
  50
  51 my $srcdir = $config{sourcedir};
  52 my $blddir = $config{builddir};
  53 my $abs_srcdir = rel2abs($srcdir);
  54 my $abs_blddir = rel2abs($blddir);
  55
  56 # Convenient cache of absolute to relative map.  We start with filling it
  57 # with mappings for the known generated header files.  They are relative to
  58 # the current working directory, so that's an easy task.
  59 # NOTE: there's more than C header files that are generated.  They will also
  60 # generate entries in this map.  We could of course deal with C header files
  61 # only, but in case we decide to handle more than just C files in the future,
  62 # we already have the mechanism in place here.
  63 # NOTE2: we lower case the index to make it searchable without regard for
  64 # character case.  That could seem dangerous, but as long as we don't have
  65 # files we depend on in the same directory that only differ by character case,
  66 # we're fine.
  67 my %depconv_cache =
  68     map { catfile($abs_blddir, $_) => $_ }
  69     keys %{$unified_info{generate}};
  70
  71 my %procedures = (
  72     'gcc' => undef,             # gcc style dependency files needs no mods
  73     'makedepend' =>
  74         sub {
  75             # makedepend, in its infinite wisdom, wants to have the object file
  76             # in the same directory as the source file.  This doesn't work too
  77             # well with out-of-source-tree builds, so we must resort to tricks
  78             # to get things right.  Fortunately, the .d files are always placed
  79             # parallel with the object files, so all we need to do is construct
  80             # the object file name from the dep file name.
  81             (my $objfile = shift) =~ s|\.d$|.o|i;
  82             my $line = shift;
  83
  84             # Discard comments
  85             return undef if $line =~ /^(#.*|\s*)$/;
  86
  87             # Remove the original object file
  88             $line =~ s|^.*\.o: | |;
  89             # Also, remove any dependency that starts with a /, because those
  90             # are typically system headers
  91             $line =~ s/\s+\/(\\.|\S)*//g;
  92             # Finally, discard all empty lines
  93             return undef if $line =~ /^\s*$/;
  94
  95             # All we got now is a dependency, just shave off surrounding spaces
  96             $line =~ s/^\s+//;
  97             $line =~ s/\s+$//;
  98             return ($objfile, $line);
  99         },
 100     'VMS C' =>
 101         sub {
 102             state $abs_srcdir_shaved = undef;
 103             state $srcdir_shaved = undef;
 104
 105             unless (defined $abs_srcdir_shaved) {
 106                 ($abs_srcdir_shaved = $abs_srcdir) =~ s|[>\]]$||;
 107                 ($srcdir_shaved = $srcdir) =~ s|[>\]]$||;
 108             }
 109
 110             # current versions of DEC / Compaq / HP / VSI C strips away all
 111             # directory information from the object file, so we must insert it
 112             # back.  To make life simpler, we simply replace it with the
 113             # corresponding .D file that's had its extension changed.  Since
 114             # .D files are always written parallel to the object files, we
 115             # thereby get the directory information for free.
 116             (my $objfile = shift) =~ s|\.D$|.OBJ|i;
 117             my $line = shift;
 118
 119             # Shave off the target.
 120             #
 121             # The pattern for target and dependencies will always take this
 122             # form:
 123             #
 124             #   target SPACE : SPACE deps
 125             #
 126             # This is so a volume delimiter (a : without any spaces around it)
 127             # won't get mixed up with the target / deps delimiter.  We use this
 128             # to easily identify what needs to be removed.
 129             m|\s:\s|; $line = $';
 130
 131             # We know that VMS has system header files in text libraries,
 132             # extension .TLB.  We also know that our header files aren't stored
 133             # in text libraries.  Finally, we know that VMS C produces exactly
 134             # one dependency per line, so we simply discard any line ending with
 135             # .TLB.
 136             return undef if /\.TLB\s*$/;
 137
 138             # All we got now is a dependency, just shave off surrounding spaces
 139             $line =~ s/^\s+//;
 140             $line =~ s/\s+$//;
 141
 142             # VMS C gives us absolute paths, always.  Let's see if we can
 143             # make them relative instead.
 144             $line = canonpath($line);
 145
 146             unless (defined $depconv_cache{$line}) {
 147                 my $dep = $line;
 148                 # Since we have already pre-populated the cache with
 149                 # mappings for generated headers, we only need to deal
 150                 # with the source tree.
 151                 if ($dep =~ s|^\Q$abs_srcdir_shaved\E([\.>\]])?|$srcdir_shaved$1|i) {
 152                     $depconv_cache{$line} = $dep;
 153                 }
 154             }
 155             return ($objfile, $depconv_cache{$line})
 156                 if defined $depconv_cache{$line};
 157             print STDERR "DEBUG[VMS C]: ignoring $objfile <- $line\n"
 158                 if $debug;
 159
 160             return undef;
 161         },
 162     'VC' =>
 163         sub {
 164             # For the moment, we only support Visual C on native Windows, or
 165             # compatible compilers.  With those, the flags /Zs /showIncludes
 166             # give us the necessary output to be able to create dependencies
 167             # that nmake (or any 'make' implementation) should be able to read,
 168             # with a bit of help.  The output we're interested in looks like
 169             # this (it always starts the same)
 170             #
 171             #   Note: including file: {whatever header file}
 172             #
 173             # Since there's no object file name at all in that information,
 174             # we must construct it ourselves.
 175
 176             (my $objfile = shift) =~ s|\.d$|.obj|i;
 177             my $line = shift;
 178
 179             # There are also other lines mixed in, for example compiler
 180             # warnings, so we simply discard anything that doesn't start with
 181             # the Note:
 182
 183             if (/^Note: including file: */) {
 184                 (my $tail = $') =~ s/\s*\R$//;
 185
 186                 # VC gives us absolute paths for all include files, so to
 187                 # remove system header dependencies, we need to check that
 188                 # they don't match $abs_srcdir or $abs_blddir.
 189                 $tail = canonpath($tail);
 190
 191                 unless (defined $depconv_cache{$tail}) {
 192                     my $dep = $tail;
 193                     # Since we have already pre-populated the cache with
 194                     # mappings for generated headers, we only need to deal
 195                     # with the source tree.
 196                     if ($dep =~ s|^\Q$abs_srcdir\E\\|\$(SRCDIR)\\|i) {
 197                         $depconv_cache{$tail} = $dep;
 198                     }
 199                 }
 200                 return ($objfile, '"'.$depconv_cache{$tail}.'"')
 201                     if defined $depconv_cache{$tail};
 202                 print STDERR "DEBUG[VC]: ignoring $objfile <- $tail\n"
 203                     if $debug;
 204             }
 205
 206             return undef;
 207         },
 208 );
 209 my %continuations = (
 210     'gcc' => undef,
 211     'makedepend' => "\\",
 212     'VMS C' => "-",
 213     'VC' => "\\",
 214 );
 215
 216 die "Producer unrecognised: $producer\n"
 217     unless exists $procedures{$producer} && exists $continuations{$producer};
 218
 219 my $procedure = $procedures{$producer};
 220 my $continuation = $continuations{$producer};
 221
 222 my $buildfile_new = "$buildfile-$$";
 223
 224 my %collect = ();
 225 if (defined $procedure) {
 226     foreach my $depfile (@depfiles) {
 227         open IDEP,$depfile or die "Trying to read $depfile: $!\n";
 228         while (<IDEP>) {
 229             s|\R$||;                # The better chomp
 230             my ($target, $deps) = $procedure->($depfile, $_);
 231             $collect{$target}->{$deps} = 1 if defined $target;
 232         }
 233         close IDEP;
 234     }
 235 }
 236
 237 open IBF, $buildfile or die "Trying to read $buildfile: $!\n";
 238 open OBF, '>', $buildfile_new or die "Trying to write $buildfile_new: $!\n";
 239 while (<IBF>) {
 240     last if /^# DO NOT DELETE THIS LINE/;
 241     print OBF or die "$!\n";
 242 }
 243 close IBF;
 244
 245 print OBF "# DO NOT DELETE THIS LINE -- make depend depends on it.\n";
 246
 247 if (defined $procedure) {
 248     foreach my $target (sort keys %collect) {
 249         my $prefix = $target . ' :';
 250         my @deps = sort keys %{$collect{$target}};
 251
 252         while (@deps) {
 253             my $buf = $prefix;
 254             $prefix = '';
 255
 256             while (@deps && ($buf eq ''
 257                                  || length($buf) + length($deps[0]) <= 77)) {
 258                 $buf .= ' ' . shift @deps;
 259             }
 260             $buf .= ' '.$continuation if @deps;
 261
 262             print OBF $buf,"\n" or die "Trying to print: $!\n"
 263         }
 264     }
 265 } else {
 266     foreach my $depfile (@depfiles) {
 267         open IDEP,$depfile or die "Trying to read $depfile: $!\n";
 268         while (<IDEP>) {
 269             print OBF or die "Trying to print: $!\n";
 270         }
 271         close IDEP;
 272     }
 273 }
 274
 275 close OBF;
 276
 277 if (compare_text($buildfile_new, $buildfile) != 0) {
 278     rename $buildfile_new, $buildfile
 279         or die "Trying to rename $buildfile_new -> $buildfile: $!\n";
 280 }
 281
 282 END {
 283     # On VMS, we want to remove all generations of this file, in case there
 284     # are more than one, so we loop.
 285     if (defined $buildfile_new) {
 286         while (unlink $buildfile_new) {}
 287     }
 288 }