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|
{- # -*- Mode: perl -*-
use File::Basename;
my $debug_resolvedepends = $ENV{BUILDFILE_DEBUG_DEPENDS};
my $debug_rules = $ENV{BUILDFILE_DEBUG_RULES};
# A cache of objects for which a recipe has already been generated
my %cache;
# collectdepends, expanddepends and reducedepends work together to make
# sure there are no duplicate or weak dependencies and that they are in
# the right order. This is used to sort the list of libraries that a
# build depends on.
sub extensionlesslib {
my @result = map { $_ =~ /(\.a)?$/; $` } @_;
return @result if wantarray;
return $result[0];
}
# collectdepends dives into the tree of dependencies and returns
# a list of all the non-weak ones.
sub collectdepends {
return () unless @_;
my $thing = shift;
my $extensionlessthing = extensionlesslib($thing);
my @listsofar = @_; # to check if we're looping
my @list = @{$unified_info{depends}->{$thing} //
$unified_info{depends}->{$extensionlessthing}};
my @newlist = ();
print STDERR "DEBUG[collectdepends] $thing > ", join(' ', @listsofar), "\n"
if $debug_resolvedepends;
foreach my $item (@list) {
my $extensionlessitem = extensionlesslib($item);
# It's time to break off when the dependency list starts looping
next if grep { extensionlesslib($_) eq $extensionlessitem } @listsofar;
# Don't add anything here if the dependency is weak
next if defined $unified_info{attributes}->{depends}->{$thing}->{$item}->{'weak'};
my @resolved = collectdepends($item, @listsofar, $item);
push @newlist, $item, @resolved;
}
print STDERR "DEBUG[collectdepends] $thing < ", join(' ', @newlist), "\n"
if $debug_resolvedepends;
@newlist;
}
# expanddepends goes through a list of stuff, checks if they have any
# dependencies, and adds them at the end of the current position if
# they aren't already present later on.
sub expanddepends {
my @after = ( @_ );
print STDERR "DEBUG[expanddepends]> ", join(' ', @after), "\n"
if $debug_resolvedepends;
my @before = ();
while (@after) {
my $item = shift @after;
print STDERR "DEBUG[expanddepends]\\ ", join(' ', @before), "\n"
if $debug_resolvedepends;
print STDERR "DEBUG[expanddepends] - ", $item, "\n"
if $debug_resolvedepends;
my @middle = (
$item,
map {
my $x = $_;
my $extlessx = extensionlesslib($x);
if (grep { $extlessx eq extensionlesslib($_) } @before
and
!grep { $extlessx eq extensionlesslib($_) } @after) {
print STDERR "DEBUG[expanddepends] + ", $x, "\n"
if $debug_resolvedepends;
( $x )
} else {
print STDERR "DEBUG[expanddepends] ! ", $x, "\n"
if $debug_resolvedepends;
()
}
} @{$unified_info{depends}->{$item} // []}
);
print STDERR "DEBUG[expanddepends] = ", join(' ', @middle), "\n"
if $debug_resolvedepends;
print STDERR "DEBUG[expanddepends]/ ", join(' ', @after), "\n"
if $debug_resolvedepends;
push @before, @middle;
}
print STDERR "DEBUG[expanddepends]< ", join(' ', @before), "\n"
if $debug_resolvedepends;
@before;
}
# reducedepends looks through a list, and checks if each item is
# repeated later on. If it is, the earlier copy is dropped.
sub reducedepends {
my @list = @_;
print STDERR "DEBUG[reducedepends]> ", join(' ', @list), "\n"
if $debug_resolvedepends;
my @newlist = ();
my %replace = ();
while (@list) {
my $item = shift @list;
my $extensionlessitem = extensionlesslib($item);
if (grep { $extensionlessitem eq extensionlesslib($_) } @list) {
if ($item ne $extensionlessitem) {
# If this instance of the library is explicitly static, we
# prefer that to any shared library name, since it must have
# been done on purpose.
$replace{$extensionlessitem} = $item;
}
} else {
push @newlist, $item;
}
}
@newlist = map { $replace{$_} // $_; } @newlist;
print STDERR "DEBUG[reducedepends]< ", join(' ', @newlist), "\n"
if $debug_resolvedepends;
@newlist;
}
# Do it all
# This takes multiple inputs and combine them into a single list of
# interdependent things. The returned value will include all the input.
# Callers are responsible for taking away the things they are building.
sub resolvedepends {
print STDERR "DEBUG[resolvedepends] START (", join(', ', @_), ")\n"
if $debug_resolvedepends;
my @all =
reducedepends(expanddepends(map { ( $_, collectdepends($_) ) } @_));
print STDERR "DEBUG[resolvedepends] END (", join(', ', @_), ") : ",
join(',', map { "\n $_" } @all), "\n"
if $debug_resolvedepends;
@all;
}
# dogenerate is responsible for producing all the recipes that build
# generated source files. It recurses in case a dependency is also a
# generated source file.
sub dogenerate {
my $src = shift;
# Safety measure
return "" unless defined $unified_info{generate}->{$_};
return "" if $cache{$src};
my $obj = shift;
my $bin = shift;
my %opts = @_;
if ($unified_info{generate}->{$src}) {
die "$src is generated by Configure, should not appear in build file\n"
if ref $unified_info{generate}->{$src} eq "";
my $script = $unified_info{generate}->{$src}->[0];
$OUT .= generatesrc(src => $src,
product => $bin,
generator => $unified_info{generate}->{$src},
generator_incs => $unified_info{includes}->{$script},
generator_deps => $unified_info{depends}->{$script},
deps => $unified_info{depends}->{$src},
incs => [ defined $obj
? @{$unified_info{includes}->{$obj}}
: (),
defined $bin
? @{$unified_info{includes}->{$bin}}
: () ],
defs => [ defined $obj
? @{$unified_info{defines}->{$obj}}
: (),
defined $bin
? @{$unified_info{defines}->{$bin}}
: () ],
%opts);
foreach (@{$unified_info{depends}->{$src}}) {
dogenerate($_, $obj, $bin, %opts);
}
}
$cache{$src} = 1;
}
sub dotarget {
my $target = shift;
return "" if $cache{$target};
$OUT .= generatetarget(target => $target,
deps => $unified_info{depends}->{$target});
foreach (@{$unified_info{depends}->{$target}}) {
dogenerate($_);
}
$cache{$target} = 1;
}
# doobj is responsible for producing all the recipes that build
# object files as well as dependency files.
sub doobj {
my $obj = shift;
return "" if $cache{$obj};
my $bin = shift;
my %opts = @_;
if (@{$unified_info{sources}->{$obj}}) {
my @srcs = @{$unified_info{sources}->{$obj}};
my @deps = @{$unified_info{depends}->{$obj}};
my @incs = ( @{$unified_info{includes}->{$obj}},
@{$unified_info{includes}->{$bin}} );
my @defs = ( @{$unified_info{defines}->{$obj}},
@{$unified_info{defines}->{$bin}} );
print STDERR "DEBUG[doobj] \@srcs for $obj ($bin) : ",
join(",", map { "\n $_" } @srcs), "\n"
if $debug_rules;
print STDERR "DEBUG[doobj] \@deps for $obj ($bin) : ",
join(",", map { "\n $_" } @deps), "\n"
if $debug_rules;
print STDERR "DEBUG[doobj] \@incs for $obj ($bin) : ",
join(",", map { "\n $_" } @incs), "\n"
if $debug_rules;
print STDERR "DEBUG[doobj] \@defs for $obj ($bin) : ",
join(",", map { "\n $_" } @defs), "\n"
if $debug_rules;
print STDERR "DEBUG[doobj] \%opts for $obj ($bin) : ", ,
join(",", map { "\n $_ = $opts{$_}" } sort keys %opts), "\n"
if $debug_rules;
$OUT .= src2obj(obj => $obj, product => $bin,
srcs => [ @srcs ], deps => [ @deps ],
incs => [ @incs ], defs => [ @defs ],
%opts);
foreach ((@{$unified_info{sources}->{$obj}},
@{$unified_info{depends}->{$obj}})) {
dogenerate($_, $obj, $bin, %opts);
}
}
$cache{$obj} = 1;
}
# Helper functions to grab all applicable intermediary files.
# This is particularly useful when a library is given as source
# rather than a dependency. In that case, we consider it to be a
# container with object file references, or possibly references
# to further libraries to pilfer in the same way.
sub getsrclibs {
my $section = shift;
# For all input, see if it sources static libraries. If it does,
# return them together with the result of a recursive call.
map { ( $_, getsrclibs($section, $_) ) }
grep { $_ =~ m|\.a$| }
map { @{$unified_info{$section}->{$_} // []} }
@_;
}
sub getlibobjs {
my $section = shift;
# For all input, see if it's an intermediary file (library or object).
# If it is, collect the result of a recursive call, or if that returns
# an empty list, the element itself. Return the result.
map {
my @x = getlibobjs($section, @{$unified_info{$section}->{$_}});
@x ? @x : ( $_ );
}
grep { defined $unified_info{$section}->{$_} }
@_;
}
# dolib is responsible for building libraries. It will call
# obj2shlib if shared libraries are produced, and obj2lib in all
# cases. It also makes sure all object files for the library are
# built.
sub dolib {
my $lib = shift;
return "" if $cache{$lib};
my %attrs = %{$unified_info{attributes}->{libraries}->{$lib}};
my @deps = ( resolvedepends(getsrclibs('sources', $lib)) );
# We support two types of objs, those who are specific to this library
# (they end up in @objs) and those that we get indirectly, via other
# libraries (they end up in @foreign_objs). We get the latter any time
# someone has done something like this in build.info:
# SOURCE[libfoo.a]=libbar.a
# The indirect object files must be kept in a separate array so they
# don't get rebuilt unnecessarily (and with incorrect auxiliary
# information).
#
# Object files can't be collected commonly for shared and static
# libraries, because we contain their respective object files in
# {shared_sources} and {sources}, and because the implications are
# slightly different for each library form.
#
# We grab all these "foreign" object files recursively with getlibobjs().
unless ($disabled{shared} || $lib =~ /\.a$/) {
my $obj2shlib = defined &obj2shlib ? \&obj2shlib : \&libobj2shlib;
# If this library sources other static libraries and those
# libraries are marked {noinst}, there's no need to include
# all of their object files. Instead, we treat those static
# libraries as dependents alongside any other library this
# one depends on, and let symbol resolution do its job.
my @sourced_libs = ();
my @objs = ();
my @foreign_objs = ();
my @deps = ();
foreach (@{$unified_info{shared_sources}->{$lib}}) {
if ($_ !~ m|\.a$|) {
push @objs, $_;
} elsif ($unified_info{attributes}->{libraries}->{$_}->{noinst}) {
push @deps, $_;
} else {
push @deps, getsrclibs('sources', $_);
push @foreign_objs, getlibobjs('sources', $_);
}
}
@deps = ( grep { $_ ne $lib } resolvedepends($lib, @deps) );
print STDERR "DEBUG[dolib:shlib] \%attrs for $lib : ", ,
join(",", map { "\n $_ = $attrs{$_}" } sort keys %attrs), "\n"
if %attrs && $debug_rules;
print STDERR "DEBUG[dolib:shlib] \@deps for $lib : ",
join(",", map { "\n $_" } @deps), "\n"
if @deps && $debug_rules;
print STDERR "DEBUG[dolib:shlib] \@objs for $lib : ",
join(",", map { "\n $_" } @objs), "\n"
if @objs && $debug_rules;
print STDERR "DEBUG[dolib:shlib] \@foreign_objs for $lib : ",
join(",", map { "\n $_" } @foreign_objs), "\n"
if @foreign_objs && $debug_rules;
$OUT .= $obj2shlib->(lib => $lib,
attrs => { %attrs },
objs => [ @objs, @foreign_objs ],
deps => [ @deps ]);
foreach (@objs) {
# If this is somehow a compiled object, take care of it that way
# Otherwise, it might simply be generated
if (defined $unified_info{sources}->{$_}) {
if($_ =~ /\.a$/) {
dolib($_);
} else {
doobj($_, $lib, intent => "shlib", attrs => { %attrs });
}
} else {
dogenerate($_, undef, undef, intent => "lib");
}
}
}
{
# When putting static libraries together, we cannot rely on any
# symbol resolution, so for all static libraries used as source for
# this one, as well as other libraries they depend on, we simply
# grab all their object files unconditionally,
# Symbol resolution will happen when any program, module or shared
# library is linked with this one.
my @objs = ();
my @sourcedeps = ();
my @foreign_objs = ();
foreach (@{$unified_info{sources}->{$lib}}) {
if ($_ !~ m|\.a$|) {
push @objs, $_;
} else {
push @sourcedeps, $_;
}
}
@sourcedeps = ( grep { $_ ne $lib } resolvedepends(@sourcedeps) );
print STDERR "DEBUG[dolib:lib] : \@sourcedeps for $_ : ",
join(",", map { "\n $_" } @sourcedeps), "\n"
if @sourcedeps && $debug_rules;
@foreign_objs = getlibobjs('sources', @sourcedeps);
print STDERR "DEBUG[dolib:lib] \%attrs for $lib : ", ,
join(",", map { "\n $_ = $attrs{$_}" } sort keys %attrs), "\n"
if %attrs && $debug_rules;
print STDERR &quo
|