#!perl -w
use strict;
-use vars qw($trysource $tryout $sentinel);
-$trysource = "try.c";
-$tryout = "try.i";
+use Pod::Usage;
+use Getopt::Std;
+use Config;
+$Getopt::Std::STANDARD_HELP_VERSION = 1;
-my $macro = shift;
-die "$0 macro [headers]" unless defined $macro;
+my $trysource = "try.c";
+my $tryout = "try.i";
-$sentinel = "$macro expands to";
+getopts('fF:ekvI:X', \my %opt) or pod2usage();
+
+my($expr, @headers) = @ARGV ? splice @ARGV : "-";
+
+pod2usage "-f and -F <tool> are exclusive\n" if $opt{f} and $opt{F};
foreach($trysource, $tryout) {
+ unlink $_ if $opt{e};
die "You already have a $_" if -e $_;
}
-if (!@ARGV) {
+if ($expr eq '-') {
+ warn "reading from stdin...\n";
+ $expr = do { local $/; <> };
+}
+
+my($macro, $args) = $expr =~ /^\s*(\w+)((?:\s*\(.*\))?)\s*;?\s*$/s
+ or pod2usage "$expr doesn't look like a macro-name or macro-expression to me";
+
+if (!(@ARGV = @headers)) {
open my $fh, '<', 'MANIFEST' or die "Can't open MANIFEST: $!";
while (<$fh>) {
push @ARGV, $1 if m!^([^/]+\.h)\t!;
}
+ push @ARGV, 'config.h' if -f 'config.h';
}
-my $args = '';
-
+my $header;
while (<>) {
next unless /^#\s*define\s+$macro\b/;
my ($def_args) = /^#\s*define\s+$macro\(([^)]*)\)/;
- if (defined $def_args) {
+ if (defined $def_args && !$args) {
my @args = split ',', $def_args;
+ print "# macro: $macro args: @args in $_\n" if $opt{v};
my $argname = "A0";
$args = '(' . join (', ', map {$argname++} 1..@args) . ')';
}
+ $header = $ARGV;
last;
}
+die "$macro not found\n" unless defined $header;
+
+if ($^O =~ /MSWin(32|64)/) {
+ # The Win32 (and Win64) build process expects to be run from
+ # bleadperl/Win32
+ chdir "Win32"
+ or die "Couldn't chdir to win32: $!";
+};
open my $out, '>', $trysource or die "Can't open $trysource: $!";
+my $sentinel = "$macro expands to";
+
+# These two are included from perl.h, and perl.h sometimes redefines their
+# macros. So no need to include them.
+my %done_header = ('embed.h' => 1, 'embedvar.h' => 1);
+
+sub do_header {
+ my $header = shift;
+ return if $done_header{$header}++;
+ print $out qq{#include "$header"\n};
+}
+
+print $out <<'EOF' if $opt{X};
+/* Need to do this like this, as cflags.sh sets it for us come what may. */
+#undef PERL_CORE
+
+EOF
+
+do_header('EXTERN.h');
+do_header('perl.h');
+do_header($header);
+do_header('XSUB.h') if $opt{X};
+
print $out <<"EOF";
-#include "EXTERN.h"
-#include "perl.h"
-#line 3 "$sentinel"
+#line 4 "$sentinel"
$macro$args
EOF
close $out or die "Can't close $trysource: $!";
-system "make $tryout" and die;
+print "doing: $Config{make} $tryout\n" if $opt{v};
+my $cmd = "$Config{make} $tryout";
+system( $cmd ) == 0
+ or die "Couldn't launch [$cmd]: $! / $?";
+
+# if user wants 'indent' formatting ..
+my $out_fh;
-open my $fh, '<', $tryout or die "Can't open $tryout: $!";
+if ($opt{f} || $opt{F}) {
+ # a: indent is a well behaved filter when given 0 arguments, reading from
+ # stdin and writing to stdout
+ # b: all our braces should be balanced, indented back to column 0, in the
+ # headers, hence everything before our #line directive can be ignored
+ #
+ # We can take advantage of this to reduce the work to indent.
-while (<$fh>) {
- print if /$sentinel/o .. 1;
+ my $indent_command = $opt{f} ? 'indent' : $opt{F};
+
+ if (defined $opt{I}) {
+ $indent_command .= " $opt{I}";
+ }
+ open $out_fh, '|-', $indent_command or die $?;
+} else {
+ $out_fh = \*STDOUT;
}
-foreach($trysource, $tryout) {
- die "Can't unlink $_" unless unlink $_;
+{
+ open my $fh, '<', $tryout or die "Can't open $tryout: $!";
+
+ while (<$fh>) {
+ print $out_fh $_ if /$sentinel/o .. 1;
+ }
+};
+
+unless ($opt{k}) {
+ foreach($trysource, $tryout) {
+ die "Can't unlink $_: $!" unless unlink $_;
+ }
}
+
+__END__
+
+=head1 NAME
+
+expand-macro.pl - expand C macros using the C preprocessor
+
+=head1 SYNOPSIS
+
+ expand-macro.pl [options]
+ [ < macro-name | macro-expression | - > [headers] ]
+
+ options:
+ -f use 'indent' to format output
+ -F <tool> use <tool> to format output (instead of -f)
+ -e erase try.[ic] instead of failing when they're present
+ (errdetect)
+ -k keep them after generating (for handy inspection)
+ -v verbose
+ -I <indent-opts> passed into indent
+ -X include "XSUB.h" (and undefine PERL_CORE)
+
+=cut