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perl/regen/embed.pl

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#!/usr/bin/perl -w
#
# Regenerate (overwriting only if changed):
#
# embed.h
# embedvar.h
# perlapi.c
# perlapi.h
# proto.h
#
# from information stored in
#
# embed.fnc
# intrpvar.h
# perlvars.h
# regen/opcodes
#
# Accepts the standard regen_lib -q and -v args.
#
# This script is normally invoked from regen.pl.
require 5.004; # keep this compatible, an old perl is all we may have before
# we build the new one
use strict;
BEGIN {
# Get function prototypes
require './regen/regen_lib.pl';
require './regen/embed_lib.pl';
}
my $unflagged_pointers;
#
# See database of global and static function prototypes in embed.fnc
# This is used to generate prototype headers under various configurations,
# export symbols lists for different platforms, and macros to provide an
# implicit interpreter context argument.
#
my $error_count = 0;
sub die_at_end ($) { # Keeps going for now, but makes sure the regen doesn't
# succeed.
warn shift;
$error_count++;
}
sub full_name ($$) { # Returns the function name with potentially the
# prefixes 'S_' or 'Perl_'
my ($func, $flags) = @_;
return "Perl_$func" if $flags =~ /p/;
return "S_$func" if $flags =~ /[si]/;
return $func;
}
sub open_print_header {
my ($file, $quote) = @_;
return open_new($file, '>',
{ file => $file, style => '*', by => 'regen/embed.pl',
from => ['data in embed.fnc', 'regen/embed.pl',
'regen/opcodes', 'intrpvar.h', 'perlvars.h'],
final => "\nEdit those files and run 'make regen_headers' to effect changes.\n",
copyright => [1993 .. 2009], quote => $quote });
}
my ($embed, $core, $ext, $api) = setup_embed();
# generate proto.h
{
my $pr = open_print_header("proto.h");
print $pr "START_EXTERN_C\n";
my $ret;
foreach (@$embed) {
if (@$_ == 1) {
print $pr "$_->[0]\n";
next;
}
my ($flags,$retval,$plain_func,@args) = @$_;
if ($flags =~ / ( [^AabDdEfiMmnOoPpRrsUWXx] ) /x) {
die_at_end "flag $1 is not legal (for function $plain_func)";
}
my @nonnull;
my $has_depth = ( $flags =~ /W/ );
my $has_context = ( $flags !~ /n/ );
my $never_returns = ( $flags =~ /r/ );
my $binarycompat = ( $flags =~ /b/ );
my $commented_out = ( ! $binarycompat && $flags =~ /m/ );
my $is_malloc = ( $flags =~ /a/ );
my $can_ignore = ( $flags !~ /R/ ) && ( $flags !~ /P/ ) && !$is_malloc;
my @names_of_nn;
my $func;
if (! $can_ignore && $retval eq 'void') {
warn "It is nonsensical to require the return value of a void function ($plain_func) to be checked";
}
die_at_end "$plain_func: s flag is mutually exclusive from the i and p plags"
if $flags =~ /s/ && $flags =~ /[ip]/;
my $static_inline = 0;
if ($flags =~ /([si])/) {
my $type;
if ($never_returns) {
$type = $1 eq 's' ? "PERL_STATIC_NO_RET" : "PERL_STATIC_INLINE_NO_RET";
}
else {
$type = $1 eq 's' ? "STATIC" : "PERL_STATIC_INLINE";
}
$retval = "$type $retval";
die_at_end "Don't declare static function '$plain_func' pure" if $flags =~ /P/;
$static_inline = $type eq 'PERL_STATIC_INLINE';
}
else {
if ($never_returns) {
$retval = "PERL_CALLCONV_NO_RET $retval";
}
else {
$retval = "PERL_CALLCONV $retval";
}
}
$func = full_name($plain_func, $flags);
$ret = "";
$ret .= "#ifndef NO_MATHOMS\n" if $binarycompat;
$ret .= "#ifndef PERL_NO_INLINE_FUNCTIONS\n" if $static_inline;
$ret .= "$retval\t$func(";
if ( $has_context ) {
$ret .= @args ? "pTHX_ " : "pTHX";
}
if (@args) {
my $n;
for my $arg ( @args ) {
++$n;
if ( $arg =~ /\*/ && $arg !~ /\b(NN|NULLOK)\b/ ) {
warn "$func: $arg needs NN or NULLOK\n";
++$unflagged_pointers;
}
my $nn = ( $arg =~ s/\s*\bNN\b\s+// );
push( @nonnull, $n ) if $nn;
my $nullok = ( $arg =~ s/\s*\bNULLOK\b\s+// ); # strip NULLOK with no effect
# Make sure each arg has at least a type and a var name.
# An arg of "int" is valid C, but want it to be "int foo".
my $temp_arg = $arg;
$temp_arg =~ s/\*//g;
$temp_arg =~ s/\s*\bstruct\b\s*/ /g;
if ( ($temp_arg ne "...")
&& ($temp_arg !~ /\w+\s+(\w+)(?:\[\d+\])?\s*$/) ) {
die_at_end "$func: $arg ($n) doesn't have a name\n";
}
if (defined $1 && $nn && !($commented_out && !$binarycompat)) {
push @names_of_nn, $1;
}
}
$ret .= join ", ", @args;
}
else {
$ret .= "void" if !$has_context;
}
$ret .= " _pDEPTH" if $has_depth;
$ret .= ")";
my @attrs;
if ( $flags =~ /r/ ) {
push @attrs, "__attribute__noreturn__";
}
if ( $flags =~ /D/ ) {
push @attrs, "__attribute__deprecated__";
}
if ( $is_malloc ) {
push @attrs, "__attribute__malloc__";
}
if ( !$can_ignore ) {
push @attrs, "__attribute__warn_unused_result__";
}
if ( $flags =~ /P/ ) {
push @attrs, "__attribute__pure__";
}
if( $flags =~ /f/ ) {
my $prefix = $has_context ? 'pTHX_' : '';
my ($args, $pat);
if ($args[-1] eq '...') {
$args = scalar @args;
$pat = $args - 1;
$args = $prefix . $args;
}
else {
# don't check args, and guess which arg is the pattern
# (one of 'fmt', 'pat', 'f'),
$args = 0;
my @fmts = grep $args[$_] =~ /\b(f|pat|fmt)$/, 0..$#args;
if (@fmts != 1) {
die "embed.pl: '$plain_func': can't determine pattern arg\n";
}
$pat = $fmts[0] + 1;
}
my $macro = grep($_ == $pat, @nonnull)
? '__attribute__format__'
: '__attribute__format__null_ok__';
if ($plain_func =~ /strftime/) {
push @attrs, sprintf "%s(__strftime__,%s1,0)", $macro, $prefix;
}
else {
push @attrs, sprintf "%s(__printf__,%s%d,%s)", $macro,
$prefix, $pat, $args;
}
}
if ( @attrs ) {
$ret .= "\n";
$ret .= join( "\n", map { "\t\t\t$_" } @attrs );
}
$ret .= ";";
$ret = "/* $ret */" if $commented_out;
if (@names_of_nn) {
$ret .= "\n#define PERL_ARGS_ASSERT_\U$plain_func\E\t\\\n\t"
. join '; ', map "assert($_)", @names_of_nn;
}
$ret .= "\n#endif" if $static_inline;
$ret .= "\n#endif" if $binarycompat;
$ret .= @attrs ? "\n\n" : "\n";
print $pr $ret;
}
print $pr <<'EOF';
#ifdef PERL_CORE
# include "pp_proto.h"
#endif
END_EXTERN_C
EOF
read_only_bottom_close_and_rename($pr) if ! $error_count;
}
die_at_end "$unflagged_pointers pointer arguments to clean up\n" if $unflagged_pointers;
sub readvars {
my ($file, $pre) = @_;
local (*FILE, $_);
my %seen;
open(FILE, '<', $file)
or die "embed.pl: Can't open $file: $!\n";
while (<FILE>) {
s/[ \t]*#.*//; # Delete comments.
if (/PERLVARA?I?C?\($pre,\s*(\w+)/) {
die_at_end "duplicate symbol $1 while processing $file line $.\n"
if $seen{$1}++;
}
}
close(FILE);
return sort keys %seen;
}
my @intrp = readvars 'intrpvar.h','I';
my @globvar = readvars 'perlvars.h','G';
sub hide {
my ($from, $to, $indent) = @_;
$indent = '' unless defined $indent;
my $t = int(length("$indent$from") / 8);
"#${indent}define $from" . "\t" x ($t < 3 ? 3 - $t : 1) . "$to\n";
}
sub multon ($$$) {
my ($sym,$pre,$ptr) = @_;
hide("PL_$sym", "($ptr$pre$sym)");
}
my $em = open_print_header('embed.h');
print $em <<'END';
/* (Doing namespace management portably in C is really gross.) */
/* By defining PERL_NO_SHORT_NAMES (not done by default) the short forms
* (like warn instead of Perl_warn) for the API are not defined.
* Not defining the short forms is a good thing for cleaner embedding. */
#ifndef PERL_NO_SHORT_NAMES
/* Hide global symbols */
END
my @az = ('a'..'z');
sub embed_h {
my ($guard, $funcs) = @_;
print $em "$guard\n" if $guard;
my $lines;
foreach (@$funcs) {
if (@$_ == 1) {
my $cond = $_->[0];
# Indent the conditionals if we are wrapped in an #if/#endif pair.
$cond =~ s/#(.*)/# $1/ if $guard;
$lines .= "$cond\n";
next;
}
my $ret = "";
my ($flags,$retval,$func,@args) = @$_;
unless ($flags =~ /[om]/) {
my $args = scalar @args;
if ($flags =~ /n/) {
my $full_name = full_name($func, $flags);
next if $full_name eq $func; # Don't output a no-op.
$ret = hide($func, $full_name);
}
elsif ($args and $args[$args-1] =~ /\.\.\./) {
if ($flags =~ /p/) {
# we're out of luck for varargs functions under CPP
# So we can only do these macros for no implicit context:
$ret = "#ifndef PERL_IMPLICIT_CONTEXT\n"
. hide($func, full_name($func, $flags)) . "#endif\n";
}
}
else {
my $alist = join(",", @az[0..$args-1]);
$ret = "#define $func($alist)";
my $t = int(length($ret) / 8);
$ret .= "\t" x ($t < 4 ? 4 - $t : 1);
$ret .= full_name($func, $flags) . "(aTHX";
$ret .= "_ " if $alist;
$ret .= $alist;
if ($flags =~ /W/) {
if ($alist) {
$ret .= " _aDEPTH";
} else {
die "Can't use W without other args (currently)";
}
}
$ret .= ")\n";
}
$ret = "#ifndef NO_MATHOMS\n$ret#endif\n" if $flags =~ /b/;
}
$lines .= $ret;
}
# Prune empty #if/#endif pairs.
while ($lines =~ s/#\s*if[^\n]+\n#\s*endif\n//) {
}
# Merge adjacent blocks.
while ($lines =~ s/(#ifndef PERL_IMPLICIT_CONTEXT
[^\n]+
)#endif
#ifndef PERL_IMPLICIT_CONTEXT
/$1/) {
}
print $em $lines;
print $em "#endif\n" if $guard;
}
embed_h('', $api);
embed_h('#if defined(PERL_CORE) || defined(PERL_EXT)', $ext);
embed_h('#ifdef PERL_CORE', $core);
print $em <<'END';
#endif /* #ifndef PERL_NO_SHORT_NAMES */
/* Compatibility stubs. Compile extensions with -DPERL_NOCOMPAT to
disable them.
*/
#if !defined(PERL_CORE)
# define sv_setptrobj(rv,ptr,name) sv_setref_iv(rv,name,PTR2IV(ptr))
# define sv_setptrref(rv,ptr) sv_setref_iv(rv,NULL,PTR2IV(ptr))
#endif
#if !defined(PERL_CORE) && !defined(PERL_NOCOMPAT)
/* Compatibility for various misnamed functions. All functions
in the API that begin with "perl_" (not "Perl_") take an explicit
interpreter context pointer.
The following are not like that, but since they had a "perl_"
prefix in previous versions, we provide compatibility macros.
*/
# define perl_atexit(a,b) call_atexit(a,b)
END
foreach (@$embed) {
my ($flags, $retval, $func, @args) = @$_;
next unless $func;
next unless $flags =~ /O/;
my $alist = join ",", @az[0..$#args];
my $ret = "# define perl_$func($alist)";
my $t = (length $ret) >> 3;
$ret .= "\t" x ($t < 5 ? 5 - $t : 1);
print $em "$ret$func($alist)\n";
}
my @nocontext;
{
my (%has_va, %has_nocontext);
foreach (@$embed) {
next unless @$_ > 1;
++$has_va{$_->[2]} if $_->[-1] =~ /\.\.\./;
++$has_nocontext{$1} if $_->[2] =~ /(.*)_nocontext/;
}
@nocontext = sort grep {
$has_nocontext{$_}
&& !/printf/ # Not clear to me why these are skipped but they are.
} keys %has_va;
}
print $em <<'END';
/* varargs functions can't be handled with CPP macros. :-(
This provides a set of compatibility functions that don't take
an extra argument but grab the context pointer using the macro
dTHX.
*/
#if defined(PERL_IMPLICIT_CONTEXT) && !defined(PERL_NO_SHORT_NAMES)
END
foreach (@nocontext) {
print $em hide($_, "Perl_${_}_nocontext", " ");
}
print $em <<'END';
#endif
#endif /* !defined(PERL_CORE) && !defined(PERL_NOCOMPAT) */
#if !defined(PERL_IMPLICIT_CONTEXT)
/* undefined symbols, point them back at the usual ones */
END
foreach (@nocontext) {
print $em hide("Perl_${_}_nocontext", "Perl_$_", " ");
}
print $em <<'END';
#endif
END
read_only_bottom_close_and_rename($em) if ! $error_count;
$em = open_print_header('embedvar.h');
print $em <<'END';
/* (Doing namespace management portably in C is really gross.) */
/*
The following combinations of MULTIPLICITY and PERL_IMPLICIT_CONTEXT
are supported:
1) none
2) MULTIPLICITY # supported for compatibility
3) MULTIPLICITY && PERL_IMPLICIT_CONTEXT
All other combinations of these flags are errors.
only #3 is supported directly, while #2 is a special
case of #3 (supported by redefining vTHX appropriately).
*/
#if defined(MULTIPLICITY)
/* cases 2 and 3 above */
# if defined(PERL_IMPLICIT_CONTEXT)
# define vTHX aTHX
# else
# define vTHX PERL_GET_INTERP
# endif
END
my $sym;
for $sym (@intrp) {
if ($sym eq 'sawampersand') {
print $em "#ifndef PL_sawampersand\n";
}
print $em multon($sym,'I','vTHX->');
if ($sym eq 'sawampersand') {
print $em "#endif\n";
}
}
print $em <<'END';
#endif /* MULTIPLICITY */
#if defined(PERL_GLOBAL_STRUCT)
END
for $sym (@globvar) {
print $em "#ifdef OS2\n" if $sym eq 'sh_path';
print $em "#ifdef __VMS\n" if $sym eq 'perllib_sep';
print $em multon($sym, 'G','my_vars->');
print $em multon("G$sym",'', 'my_vars->');
print $em "#endif\n" if $sym eq 'sh_path';
print $em "#endif\n" if $sym eq 'perllib_sep';
}
print $em <<'END';
#endif /* PERL_GLOBAL_STRUCT */
END
read_only_bottom_close_and_rename($em) if ! $error_count;
my $capih = open_print_header('perlapi.h');
print $capih <<'EOT';
/* declare accessor functions for Perl variables */
#ifndef __perlapi_h__
#define __perlapi_h__
#if defined (MULTIPLICITY) && defined (PERL_GLOBAL_STRUCT)
START_EXTERN_C
#undef PERLVAR
#undef PERLVARA
#undef PERLVARI
#undef PERLVARIC
#define PERLVAR(p,v,t) EXTERN_C t* Perl_##p##v##_ptr(pTHX);
#define PERLVARA(p,v,n,t) typedef t PL_##v##_t[n]; \
EXTERN_C PL_##v##_t* Perl_##p##v##_ptr(pTHX);
#define PERLVARI(p,v,t,i) PERLVAR(p,v,t)
#define PERLVARIC(p,v,t,i) PERLVAR(p,v, const t)
#include "perlvars.h"
#undef PERLVAR
#undef PERLVARA
#undef PERLVARI
#undef PERLVARIC
END_EXTERN_C
#if defined(PERL_CORE)
/* accessor functions for Perl "global" variables */
/* these need to be mentioned here, or most linkers won't put them in
the perl executable */
#ifndef PERL_NO_FORCE_LINK
START_EXTERN_C
#ifndef DOINIT
EXTCONST void * const PL_force_link_funcs[];
#else
EXTCONST void * const PL_force_link_funcs[] = {
#undef PERLVAR
#undef PERLVARA
#undef PERLVARI
#undef PERLVARIC
#define PERLVAR(p,v,t) (void*)Perl_##p##v##_ptr,
#define PERLVARA(p,v,n,t) PERLVAR(p,v,t)
#define PERLVARI(p,v,t,i) PERLVAR(p,v,t)
#define PERLVARIC(p,v,t,i) PERLVAR(p,v,t)
/* In Tru64 (__DEC && __osf__) the cc option -std1 causes that one
* cannot cast between void pointers and function pointers without
* info level warnings. The PL_force_link_funcs[] would cause a few
* hundred of those warnings. In code one can circumnavigate this by using
* unions that overlay the different pointers, but in declarations one
* cannot use this trick. Therefore we just disable the warning here
* for the duration of the PL_force_link_funcs[] declaration. */
#if defined(__DECC) && defined(__osf__)
#pragma message save
#pragma message disable (nonstandcast)
#endif
#include "perlvars.h"
#if defined(__DECC) && defined(__osf__)
#pragma message restore
#endif
#undef PERLVAR
#undef PERLVARA
#undef PERLVARI
#undef PERLVARIC
};
#endif /* DOINIT */
END_EXTERN_C
#endif /* PERL_NO_FORCE_LINK */
#else /* !PERL_CORE */
EOT
foreach $sym (@globvar) {
print $capih
"#undef PL_$sym\n" . hide("PL_$sym", "(*Perl_G${sym}_ptr(NULL))");
}
print $capih <<'EOT';
#endif /* !PERL_CORE */
#endif /* MULTIPLICITY && PERL_GLOBAL_STRUCT */
#endif /* __perlapi_h__ */
EOT
read_only_bottom_close_and_rename($capih) if ! $error_count;
my $capi = open_print_header('perlapi.c', <<'EOQ');
*
*
* Up to the threshold of the door there mounted a flight of twenty-seven
* broad stairs, hewn by some unknown art of the same black stone. This
* was the only entrance to the tower; ...
*
* [p.577 of _The Lord of the Rings_, III/x: "The Voice of Saruman"]
*
*/
EOQ
print $capi <<'EOT';
#include "EXTERN.h"
#include "perl.h"
#include "perlapi.h"
#if defined (MULTIPLICITY) && defined (PERL_GLOBAL_STRUCT)
/* accessor functions for Perl "global" variables */
START_EXTERN_C
#undef PERLVARI
#define PERLVARI(p,v,t,i) PERLVAR(p,v,t)
#undef PERLVAR
#undef PERLVARA
#define PERLVAR(p,v,t) t* Perl_##p##v##_ptr(pTHX) \
{ dVAR; PERL_UNUSED_CONTEXT; return &(PL_##v); }
#define PERLVARA(p,v,n,t) PL_##v##_t* Perl_##p##v##_ptr(pTHX) \
{ dVAR; PERL_UNUSED_CONTEXT; return &(PL_##v); }
#undef PERLVARIC
#define PERLVARIC(p,v,t,i) \
const t* Perl_##p##v##_ptr(pTHX) \
{ PERL_UNUSED_CONTEXT; return (const t *)&(PL_##v); }
#include "perlvars.h"
#undef PERLVAR
#undef PERLVARA
#undef PERLVARI
#undef PERLVARIC
END_EXTERN_C
#endif /* MULTIPLICITY && PERL_GLOBAL_STRUCT */
EOT
read_only_bottom_close_and_rename($capi) if ! $error_count;
die "$error_count errors found" if $error_count;
# ex: set ts=8 sts=4 sw=4 noet:
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