1 ################################################################################
3 # PPPort_pm.PL -- generate PPPort.pm
5 # Set the environment variable DPPP_CHECK_LEVEL to more than zero for some
6 # extra checking. 1 or 2 currently
8 ################################################################################
10 # Version 3.x, Copyright (C) 2004-2013, Marcus Holland-Moritz.
11 # Copyright (C) 2018, The perl5 porters
12 # Version 2.x, Copyright (C) 2001, Paul Marquess.
13 # Version 1.x, Copyright (C) 1999, Kenneth Albanowski.
15 # This program is free software; you can redistribute it and/or
16 # modify it under the same terms as Perl itself.
18 ################################################################################
22 require "./parts/ppptools.pl";
24 my $INCLUDE = 'parts/inc';
27 my %embed = map { ( $_->{name} => $_ ) }
28 parse_embed(qw(parts/embed.fnc parts/apidoc.fnc parts/ppport.fnc));
30 my(%provides, %prototypes, %explicit);
32 my $data = do { local $/; <DATA> };
34 # Call include(file, params) for every line that begins with %include
35 $data =~ s{^\%(include)\s+(\w+)((?:[^\S\r\n]+.*?)?)\s*$}
36 {eval "$1('$2', $3)" or die $@}gem;
38 $data = expand($data);
40 my @api = sort { lc $a cmp lc $b or $a cmp $b } keys %provides;
42 $data =~ s{^(.*)__PROVIDED_API__(\s*?)^}
43 {join '', map "$1$_\n", @api}gem;
47 for (keys %explicit) {
48 length > $len and $len = length;
50 my $format = sprintf '%%-%ds %%-%ds %%s', $len+2, $len+5;
53 $data =~ s!^(.*)__EXPLICIT_API__(\s*?)^!
54 sprintf("$1$format\n", 'Function / Variable', 'Static Request', 'Global Request') .
55 $1 . '-'x$len . "\n" .
56 join('', map { sprintf "$1$format\n", $explicit{$_} eq 'var' ? $_ : "$_()", "NEED_$_", "NEED_${_}_GLOBAL" }
61 my %raw_base = %{&parse_todo('parts/base')};
62 my %raw_todo = %{&parse_todo('parts/todo')};
65 for (keys %raw_todo) {
66 push @{$todo{$raw_todo{$_}}}, $_;
71 if (exists $raw_todo{$_} and exists $raw_base{$_}) {
72 if ($raw_base{$_} eq $raw_todo{$_}) {
73 warn "$INCLUDE/$provides{$_} provides $_, which is still marked "
74 . "todo for " . format_version($raw_todo{$_}) . "\n";
77 check(2, "$_ was ported back to " . format_version($raw_todo{$_}) .
78 " (baseline revision: " . format_version($raw_base{$_}) . ").");
84 for (keys %provides) {
85 next if /^Perl_(.*)/ && exists $embed{$1};
86 next if exists $embed{$_};
88 check(2, "No API definition for provided element $_ found.");
91 push @perl_api, keys %embed;
94 if (exists $provides{$_} && !exists $raw_base{$_}) {
95 check(2, "Mmmh, $_ doesn't seem to need backporting.");
97 my $line = "$_|" . (exists $provides{$_} && exists $raw_base{$_} ? $raw_base{$_} : '') . '|';
98 $line .= ($raw_todo{$_} || '') . '|';
99 $line .= 'p' if exists $provides{$_};
100 if (exists $embed{$_}) {
102 if (exists $e->{flags}{p}) { # Has 'Perl_' prefix
103 my $args = $e->{args};
104 $line .= 'v' if @$args && $args->[-1][0] eq '...';
106 $line .= 'n' if exists $e->{flags}{T}; # No thread context parameter
111 $data =~ s/^([\t ]*)__PERL_API__(\s*?)$/
112 join "\n", map "$1$_", sort @perl_api
115 my $undocumented = "(undocumented)";
118 for (reverse sort keys %todo) {
119 my $ver = format_version($_);
120 my $todo = "=item perl $ver\n\n";
121 for (sort @{$todo{$_}}) {
123 $todo .= " (DEPRECATED)" if $embed{$_}->{flags}{D};
124 $todo .= " (marked experimental)" if $embed{$_}->{flags}{x};
125 $todo .= " $undocumented" unless $embed{$_}->{flags}{d};
131 $data =~ s{^__UNSUPPORTED_API__(\s*?)^}
132 {join "\n", @todo}gem;
134 $data =~ s{__MIN_PERL__}{5.003}g;
135 $data =~ s{__MAX_PERL__}{5.30}g;
137 open FH, ">PPPort.pm" or die "PPPort.pm: $!\n";
145 my($file, $opt) = @_;
147 print "including $file\n";
149 my $data = parse_partspec("$INCLUDE/$file");
151 for (@{$data->{provides}}) {
152 if (exists $provides{$_}) {
153 if ($provides{$_} ne $file) {
154 warn "$file: $_ already provided by $provides{$_}\n";
158 $provides{$_} = $file;
162 for (keys %{$data->{prototypes}}) {
163 $prototypes{$_} = $data->{prototypes}{$_};
164 $prototypes{$_} = normalize_prototype($data->{prototypes}{$_});
165 $data->{implementation} =~ s/^$_(?=\s*\()/$DPPP(my_$_)/mg;
168 my $out = $data->{implementation};
170 if (exists $opt->{indent}) {
171 $out =~ s/^/$opt->{indent}/gm;
180 $code =~ s{^(\s*#\s*(?:el)?if\s+)(.*)$}{$1.expand_pp_expressions($2)}gem;
190 (?:[^\r\n\\]|\\[^\r\n])*
194 (?:[^\r\n\\]|\\[^\r\n])*
198 {expand_undefined($2, $1, $3)}gemx;
199 $code =~ s{^([^\S\r\n]*)__NEED_VAR__\s+(.*?)\s+(\w+)(?:\s*=\s*([^;]+?))?\s*;\s*$}
200 {expand_need_var($1, $3, $2, $4)}gem;
201 $code =~ s{^([^\S\r\n]*)__NEED_DUMMY_VAR__\s+(.*?)\s+(\w+)(?:\s*=\s*([^;]+?))?\s*;\s*$}
202 {expand_need_dummy_var($1, $3, $2, $4)}gem;
208 my($indent, $var, $type, $init) = @_;
210 $explicit{$var} = 'var';
212 my $myvar = "$DPPP(my_$var)";
213 $init = defined $init ? " = $init" : "";
215 my $code = <<ENDCODE;
216 #if defined(NEED_$var)
217 static $type $myvar$init;
218 #elif defined(NEED_${var}_GLOBAL)
226 $code =~ s/^/$indent/mg;
231 sub expand_need_dummy_var
233 my($indent, $var, $type, $init) = @_;
235 $explicit{$var} = 'var';
237 my $myvar = "$DPPP(dummy_$var)";
238 $init = defined $init ? " = $init" : "";
240 my $code = <<ENDCODE;
241 #if defined(NEED_$var)
242 static $type $myvar$init;
243 #elif defined(NEED_${var}_GLOBAL)
250 $code =~ s/^/$indent/mg;
257 my($macro, $withargs, $def) = @_;
258 my $rv = "#ifndef $macro\n# define ";
260 if (defined $def && $def =~ /\S/) {
261 $rv .= sprintf "%-30s %s", $withargs, $def;
272 sub expand_pp_expressions
275 $pp =~ s/\{([^\}]+)\}/expand_pp_expr($1)/ge;
283 if ($expr =~ /^\s*need\s+(\w+)\s*$/i) {
285 my $e = $embed{$func} or die "unknown API function '$func' in NEED\n";
286 my $proto = make_prototype($e);
287 if (exists $prototypes{$func}) {
288 if (compare_prototypes($proto, $prototypes{$func})) {
289 check(1, "differing prototypes for $func:\n API: $proto\n PPP: $prototypes{$func}");
290 $proto = $prototypes{$func};
294 warn "found no prototype for $func\n";;
297 $explicit{$func} = 'func';
299 $proto =~ s/\b$func(?=\s*\()/$DPPP(my_$func)/;
300 my $embed = make_embed($e);
302 return "defined(NEED_$func)\n"
309 . "#if defined(NEED_$func) || defined(NEED_${func}_GLOBAL)\n"
314 die "cannot expand preprocessor expression '$expr'\n";
321 my $a = do { my $x = 'a'; join ',', map { $x++ } 1 .. @{$f->{args}} };
322 my $lastarg = ${$f->{args}}[-1];
324 if ($f->{flags}{T}) {
325 if ($f->{flags}{p}) {
326 return "#define $n $DPPP(my_$n)\n" .
327 "#define Perl_$n $DPPP(my_$n)";
330 return "#define $n $DPPP(my_$n)";
339 if ($f->{flags}{p}) {
340 if ($f->{flags}{f}) {
341 return "#define Perl_$n $DPPP(my_$n)";
343 elsif (@$lastarg && $lastarg->[0] =~ /\.\.\./) {
344 return $undef . "#define $n $DPPP(my_$n)\n" .
345 "#define Perl_$n $DPPP(my_$n)";
348 return $undef . "#define $n($a) $DPPP(my_$n)(aTHX_ $a)\n" .
349 "#define Perl_$n $DPPP(my_$n)";
353 return $undef . "#define $n($a) $DPPP(my_$n)(aTHX_ $a)";
362 if (exists $ENV{DPPP_CHECK_LEVEL} and $ENV{DPPP_CHECK_LEVEL} >= $level) {
363 print STDERR @_, "\n";
368 ################################################################################
370 # !!!!! Do NOT edit this file directly! -- Edit PPPort_pm.PL instead. !!!!!
372 # This file was automatically generated from the definition files in the
373 # parts/inc/ subdirectory by PPPort_pm.PL. To learn more about how all this
374 # works, please read the F<HACKERS> file that came with this distribution.
376 ################################################################################
378 # Perl/Pollution/Portability
380 ################################################################################
382 # Version 3.x, Copyright (C) 2004-2013, Marcus Holland-Moritz.
383 # Copyright (C) 2018, The perl5 porters
384 # Version 2.x, Copyright (C) 2001, Paul Marquess.
385 # Version 1.x, Copyright (C) 1999, Kenneth Albanowski.
387 # This program is free software; you can redistribute it and/or
388 # modify it under the same terms as Perl itself.
390 ################################################################################
394 Devel::PPPort - Perl/Pollution/Portability
398 Devel::PPPort::WriteFile(); # defaults to ./ppport.h
399 Devel::PPPort::WriteFile('someheader.h');
401 # Same as above but retrieve contents rather than write file
402 my $contents = Devel::PPPort::GetFileContents();
403 my $contents = Devel::PPPort::GetFileContents('someheader.h');
405 =head1 Start using Devel::PPPort for XS projects
408 $ perl -MDevel::PPPort -e'Devel::PPPort::WriteFile'
409 $ perl ppport.h --compat-version=5.6.1 --patch=diff.patch *.xs
410 $ patch -p0 < diff.patch
411 $ echo ppport.h >>MANIFEST
415 Perl's API has changed over time, gaining new features, new functions,
416 increasing its flexibility, and reducing the impact on the C namespace
417 environment (reduced pollution). The header file written by this module,
418 typically F<ppport.h>, attempts to bring some of the newer Perl API
419 features to older versions of Perl, so that you can worry less about
420 keeping track of old releases, but users can still reap the benefit.
422 C<Devel::PPPort> contains two functions, C<WriteFile> and C<GetFileContents>.
423 C<WriteFile>'s only purpose is to write the F<ppport.h> C header file.
424 This file contains a series of macros and, if explicitly requested, functions
425 that allow XS modules to be built using older versions of Perl. Currently,
426 Perl versions from __MIN_PERL__ to __MAX_PERL__ are supported.
428 C<GetFileContents> can be used to retrieve the file contents rather than
431 This module is used by C<h2xs> to write the file F<ppport.h>.
433 =head2 Why use ppport.h?
435 You should use F<ppport.h> in modern code so that your code will work
436 with the widest range of Perl interpreters possible, without significant
439 You should attempt to get older code to fully use F<ppport.h>, because the
440 reduced pollution of newer Perl versions is an important thing. It's so
441 important that the old polluting ways of original Perl modules will not be
442 supported very far into the future, and your module will almost certainly
443 break! By adapting to it now, you'll gain compatibility and a sense of
444 having done the electronic ecology some good.
446 =head2 How to use ppport.h
448 Don't direct the users of your module to download C<Devel::PPPort>.
449 They are most probably not XS writers. Also, don't make F<ppport.h>
450 optional. Rather, just take the most recent copy of F<ppport.h> that
451 you can find (e.g. by generating it with the latest C<Devel::PPPort>
452 release from CPAN), copy it into your project, adjust your project to
453 use it, and distribute the header along with your module.
455 =head2 Running ppport.h
457 But F<ppport.h> is more than just a C header. It's also a Perl script
458 that can check your source code. It will suggest hints and portability
459 notes, and can even make suggestions on how to change your code. You
460 can run it like any other Perl program:
462 perl ppport.h [options] [files]
464 It also has embedded documentation, so you can use
468 to find out more about how to use it.
474 C<WriteFile> takes one optional argument. When called with one
475 argument, it expects to be passed a filename. When called with
476 no arguments, it defaults to the filename F<ppport.h>.
478 The function returns a true value if the file was written successfully.
479 Otherwise it returns a false value.
481 =head2 GetFileContents
483 C<GetFileContents> behaves like C<WriteFile> above, but returns the contents
484 of the would-be file rather than writing it out.
488 F<ppport.h> supports Perl versions from __MIN_PERL__ to __MAX_PERL__
489 in threaded and non-threaded configurations.
491 =head2 Provided Perl compatibility API
493 The header file written by this module, typically F<ppport.h>, provides
494 access to the following elements of the Perl API that are not otherwise
495 available in Perl releases older than when the elements were first introduced.
496 (Many of these are not supported all the way back to __MIN_PERL__;
497 see L</Perl API not supported by ppport.h back to __MIN_PERL__> for details.)
501 =head2 Perl API not supported by ppport.h back to __MIN_PERL__
503 There is still a big part of the API not fully supported by F<ppport.h>.
504 This can be because it doesn't make sense to back-port that part of the API,
505 or simply because it hasn't been implemented yet. Patches welcome! Some
506 elements are ported backward for some releases, but not all the way to
509 Below is a list of the API that isn't currently supported back to
510 __MIN_PERL__, sorted by the version of Perl below which it is unsupported.
511 Only things you should be using are included in the list, so not listed are
512 deprecated and experimental functions.
514 Some of the entries are marked as "undocumented". This means that they
515 aren't necessarily considered stable, and could be changed or removed in some
516 future release without warning. It is therefore a bad idea to use them
517 without further checking. It could be that these are considered to be for
518 perl core use only; or it could be, though, that C<Devel::PPPort> doesn't know
519 where to find their documentation, or that it's just an oversight that they
520 haven't been documented. If you want to use one, and potentially have it
521 backported, first send mail to L<mailto:perl5-porters@perl.org>.
531 If you find any bugs, C<Devel::PPPort> doesn't seem to build on your
532 system, or any of its tests fail, please send a bug report to
533 L<perlbug@perl.org|mailto:perlbug@perl.org>.
541 Version 1.x of Devel::PPPort was written by Kenneth Albanowski.
545 Version 2.x was ported to the Perl core by Paul Marquess.
549 Version 3.x was ported back to CPAN by Marcus Holland-Moritz.
553 Versions >= 3.22 are maintained by perl5 porters
559 Version 3.x, Copyright (C) 2004-2013, Marcus Holland-Moritz.
561 Copyright (C) 2018, The perl5 porters
563 Version 2.x, Copyright (C) 2001, Paul Marquess.
565 Version 1.x, Copyright (C) 1999, Kenneth Albanowski.
567 This program is free software; you can redistribute it and/or
568 modify it under the same terms as Perl itself.
572 See L<h2xs>, L<ppport.h>.
576 package Devel::PPPort;
579 use vars qw($VERSION $data);
585 $data = do { local $/; <DATA> };
586 my $pkg = 'Devel::PPPort';
587 $data =~ s/__PERL_VERSION__/$]/g;
588 $data =~ s/__VERSION__/$VERSION/g;
589 $data =~ s/__PKG__/$pkg/g;
593 sub GetFileContents {
594 my $file = shift || 'ppport.h';
595 defined $data or _init_data();
597 $copy =~ s/\bppport\.h\b/$file/g;
604 my $file = shift || 'ppport.h';
605 my $data = GetFileContents($file);
606 open F, ">$file" or return undef;
620 ----------------------------------------------------------------------
622 ppport.h -- Perl/Pollution/Portability Version __VERSION__
624 Automatically created by __PKG__ running under perl __PERL_VERSION__.
626 Do NOT edit this file directly! -- Edit PPPort_pm.PL and the
627 includes in parts/inc/ instead.
629 Use 'perldoc ppport.h' to view the documentation below.
631 ----------------------------------------------------------------------
635 %include ppphdoc { indent => '|>' }
642 #ifndef _P_P_PORTABILITY_H_
643 #define _P_P_PORTABILITY_H_
645 #ifndef DPPP_NAMESPACE
646 # define DPPP_NAMESPACE DPPP_
649 #define DPPP_CAT2(x,y) CAT2(x,y)
650 #define DPPP_(name) DPPP_CAT2(DPPP_NAMESPACE, name)
722 #endif /* _P_P_PORTABILITY_H_ */
724 /* End of File ppport.h */