mirror of
https://github.com/Perl/perl5.git
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155 lines
3.7 KiB
Perl
Executable File
155 lines
3.7 KiB
Perl
Executable File
#!perl -w
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use strict;
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use Pod::Usage;
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use Getopt::Std;
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use Config;
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$Getopt::Std::STANDARD_HELP_VERSION = 1;
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my $trysource = "try.c";
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my $tryout = "try.i";
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getopts('fF:ekvI:X', \my %opt) or pod2usage();
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my($expr, @headers) = @ARGV ? splice @ARGV : "-";
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pod2usage "-f and -F <tool> are exclusive\n" if $opt{f} and $opt{F};
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foreach($trysource, $tryout) {
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unlink $_ if $opt{e};
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die "You already have a $_" if -e $_;
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}
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if ($expr eq '-') {
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warn "reading from stdin...\n";
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$expr = do { local $/; <> };
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}
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my($macro, $args) = $expr =~ /^\s*(\w+)((?:\s*\(.*\))?)\s*;?\s*$/s
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or pod2usage "$expr doesn't look like a macro-name or macro-expression to me";
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if (!(@ARGV = @headers)) {
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open my $fh, '<', 'MANIFEST' or die "Can't open MANIFEST: $!";
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while (<$fh>) {
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push @ARGV, $1 if m!^([^/]+\.h)\t!;
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}
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push @ARGV, 'config.h' if -f 'config.h';
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}
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my $header;
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while (<>) {
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next unless /^#\s*define\s+$macro\b/;
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my ($def_args) = /^#\s*define\s+$macro\(([^)]*)\)/;
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if (defined $def_args && !$args) {
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my @args = split ',', $def_args;
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print "# macro: $macro args: @args in $_\n" if $opt{v};
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my $argname = "A0";
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$args = '(' . join (', ', map {$argname++} 1..@args) . ')';
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}
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$header = $ARGV;
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last;
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}
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die "$macro not found\n" unless defined $header;
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if ($^O =~ /MSWin(32|64)/) {
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# The Win32 (and Win64) build process expects to be run from
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# bleadperl/Win32
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chdir "Win32"
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or die "Couldn't chdir to win32: $!";
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};
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open my $out, '>', $trysource or die "Can't open $trysource: $!";
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my $sentinel = "$macro expands to";
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# These two are included from perl.h, and perl.h sometimes redefines their
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# macros. So no need to include them.
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my %done_header = ('embed.h' => 1, 'embedvar.h' => 1);
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sub do_header {
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my $header = shift;
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return if $done_header{$header}++;
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print $out qq{#include "$header"\n};
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}
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print $out <<'EOF' if $opt{X};
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/* Need to do this like this, as cflags.sh sets it for us come what may. */
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#undef PERL_CORE
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EOF
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do_header('EXTERN.h');
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do_header('perl.h');
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do_header($header);
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do_header('XSUB.h') if $opt{X};
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print $out <<"EOF";
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#line 4 "$sentinel"
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$macro$args
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EOF
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close $out or die "Can't close $trysource: $!";
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print "doing: $Config{make} $tryout\n" if $opt{v};
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my $cmd = "$Config{make} $tryout";
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system( $cmd ) == 0
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or die "Couldn't launch [$cmd]: $! / $?";
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# if user wants 'indent' formatting ..
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my $out_fh;
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if ($opt{f} || $opt{F}) {
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# a: indent is a well behaved filter when given 0 arguments, reading from
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# stdin and writing to stdout
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# b: all our braces should be balanced, indented back to column 0, in the
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# headers, hence everything before our #line directive can be ignored
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#
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# We can take advantage of this to reduce the work to indent.
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my $indent_command = $opt{f} ? 'indent' : $opt{F};
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if (defined $opt{I}) {
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$indent_command .= " $opt{I}";
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}
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open $out_fh, '|-', $indent_command or die $?;
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} else {
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$out_fh = \*STDOUT;
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}
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{
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open my $fh, '<', $tryout or die "Can't open $tryout: $!";
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while (<$fh>) {
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print $out_fh $_ if /$sentinel/o .. 1;
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}
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};
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unless ($opt{k}) {
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foreach($trysource, $tryout) {
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die "Can't unlink $_: $!" unless unlink $_;
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}
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}
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__END__
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=head1 NAME
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expand-macro.pl - expand C macros using the C preprocessor
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=head1 SYNOPSIS
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expand-macro.pl [options]
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[ < macro-name | macro-expression | - > [headers] ]
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options:
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-f use 'indent' to format output
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-F <tool> use <tool> to format output (instead of -f)
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-e erase try.[ic] instead of failing when they're present
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(errdetect)
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-k keep them after generating (for handy inspection)
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-v verbose
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-I <indent-opts> passed into indent
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-X include "XSUB.h" (and undefine PERL_CORE)
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=cut
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