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PK {0"\�a�w� � Constant/Utils.pmnu �[��� package ExtUtils::Constant::Utils; use strict; use vars qw($VERSION @EXPORT_OK @ISA); use Carp; @ISA = 'Exporter'; @EXPORT_OK = qw(C_stringify perl_stringify); $VERSION = '0.04'; use constant is_perl55 => ($] < 5.005_50); use constant is_perl56 => ($] < 5.007 && $] > 5.005_50); use constant is_sane_perl => $] > 5.007; =head1 NAME ExtUtils::Constant::Utils - helper functions for ExtUtils::Constant =head1 SYNOPSIS use ExtUtils::Constant::Utils qw (C_stringify); $C_code = C_stringify $stuff; =head1 DESCRIPTION ExtUtils::Constant::Utils packages up utility subroutines used by ExtUtils::Constant, ExtUtils::Constant::Base and derived classes. All its functions are explicitly exportable. =head1 USAGE =over 4 =item C_stringify NAME A function which returns a 7 bit ASCII correctly \ escaped version of the string passed suitable for C's "" or ''. It will die if passed Unicode characters. =cut # Hopefully make a happy C identifier. sub C_stringify { local $_ = shift; return unless defined $_; # grr 5.6.1 confess "Wide character in '$_' intended as a C identifier" if tr/\0-\377// != length; # grr 5.6.1 more so because its regexps will break on data that happens to # be utf8, which includes my 8 bit test cases. $_ = pack 'C*', unpack 'U*', $_ . pack 'U*' if is_perl56; s/\\/\\\\/g; s/([\"\'])/\\$1/g; # Grr. fix perl mode. s/\n/\\n/g; # Ensure newlines don't end up in octal s/\r/\\r/g; s/\t/\\t/g; s/\f/\\f/g; s/\a/\\a/g; unless (is_perl55) { # This will elicit a warning on 5.005_03 about [: :] being reserved unless # I cheat my $cheat = '([[:^print:]])'; if (ord('A') == 193) { # EBCDIC has no ^\0-\177 workalike. s/$cheat/sprintf "\\%03o", ord $1/ge; } else { s/([^\0-\177])/sprintf "\\%03o", ord $1/ge; } s/$cheat/sprintf "\\%03o", ord $1/ge; } else { require POSIX; s/([^A-Za-z0-9_])/POSIX::isprint($1) ? $1 : sprintf "\\%03o", ord $1/ge; } $_; } =item perl_stringify NAME A function which returns a 7 bit ASCII correctly \ escaped version of the string passed suitable for a perl "" string. =cut # Hopefully make a happy perl identifier. sub perl_stringify { local $_ = shift; return unless defined $_; s/\\/\\\\/g; s/([\"\'])/\\$1/g; # Grr. fix perl mode. s/\n/\\n/g; # Ensure newlines don't end up in octal s/\r/\\r/g; s/\t/\\t/g; s/\f/\\f/g; s/\a/\\a/g; unless (is_perl55) { # This will elicit a warning on 5.005_03 about [: :] being reserved unless # I cheat my $cheat = '([[:^print:]])'; if (is_sane_perl) { if (ord('A') == 193) { # EBCDIC has no ^\0-\177 workalike. s/$cheat/sprintf "\\x{%X}", ord $1/ge; } else { s/([^\0-\177])/sprintf "\\x{%X}", ord $1/ge; } } else { # Grr 5.6.1. And I don't think I can use utf8; to force the regexp # because 5.005_03 will fail. # This is grim, but I also can't split on // my $copy; foreach my $index (0 .. length ($_) - 1) { my $char = substr ($_, $index, 1); $copy .= ($char le "\177") ? $char : sprintf "\\x{%X}", ord $char; } $_ = $copy; } s/$cheat/sprintf "\\%03o", ord $1/ge; } else { # Turns out "\x{}" notation only arrived with 5.6 s/([^\0-\177])/sprintf "\\x%02X", ord $1/ge; require POSIX; s/([^A-Za-z0-9_])/POSIX::isprint($1) ? $1 : sprintf "\\%03o", ord $1/ge; } $_; } 1; __END__ =back =head1 AUTHOR Nicholas Clark <nick@ccl4.org> based on the code in C<h2xs> by Larry Wall and others PK {0"\K, <� � Constant/XS.pmnu �[��� package ExtUtils::Constant::XS; use strict; use vars qw($VERSION %XS_Constant %XS_TypeSet @ISA @EXPORT_OK $is_perl56); use Carp; use ExtUtils::Constant::Utils 'perl_stringify'; require ExtUtils::Constant::Base; @ISA = qw(ExtUtils::Constant::Base Exporter); @EXPORT_OK = qw(%XS_Constant %XS_TypeSet); $VERSION = '0.03'; $is_perl56 = ($] < 5.007 && $] > 5.005_50); =head1 NAME ExtUtils::Constant::XS - generate C code for XS modules' constants. =head1 SYNOPSIS require ExtUtils::Constant::XS; =head1 DESCRIPTION ExtUtils::Constant::XS overrides ExtUtils::Constant::Base to generate C code for XS modules' constants. =head1 BUGS Nothing is documented. Probably others. =head1 AUTHOR Nicholas Clark <nick@ccl4.org> based on the code in C<h2xs> by Larry Wall and others =cut # '' is used as a flag to indicate non-ascii macro names, and hence the need # to pass in the utf8 on/off flag. %XS_Constant = ( '' => '', IV => 'PUSHi(iv)', UV => 'PUSHu((UV)iv)', NV => 'PUSHn(nv)', PV => 'PUSHp(pv, strlen(pv))', PVN => 'PUSHp(pv, iv)', SV => 'PUSHs(sv)', YES => 'PUSHs(&PL_sv_yes)', NO => 'PUSHs(&PL_sv_no)', UNDEF => '', # implicit undef ); %XS_TypeSet = ( IV => '*iv_return = ', UV => '*iv_return = (IV)', NV => '*nv_return = ', PV => '*pv_return = ', PVN => ['*pv_return = ', '*iv_return = (IV)'], SV => '*sv_return = ', YES => undef, NO => undef, UNDEF => undef, ); sub header { my $start = 1; my @lines; push @lines, "#define PERL_constant_NOTFOUND\t$start\n"; $start++; push @lines, "#define PERL_constant_NOTDEF\t$start\n"; $start++; foreach (sort keys %XS_Constant) { next if $_ eq ''; push @lines, "#define PERL_constant_IS$_\t$start\n"; $start++; } push @lines, << 'EOT'; #ifndef NVTYPE typedef double NV; /* 5.6 and later define NVTYPE, and typedef NV to it. */ #endif #ifndef aTHX_ #define aTHX_ /* 5.6 or later define this for threading support. */ #endif #ifndef pTHX_ #define pTHX_ /* 5.6 or later define this for threading support. */ #endif EOT return join '', @lines; } sub valid_type { my ($self, $type) = @_; return exists $XS_TypeSet{$type}; } # This might actually be a return statement sub assignment_clause_for_type { my $self = shift; my $args = shift; my $type = $args->{type}; my $typeset = $XS_TypeSet{$type}; if (ref $typeset) { die "Type $type is aggregate, but only single value given" if @_ == 1; return map {"$typeset->[$_]$_[$_];"} 0 .. $#$typeset; } elsif (defined $typeset) { confess "Aggregate value given for type $type" if @_ > 1; return "$typeset$_[0];"; } return (); } sub return_statement_for_type { my ($self, $type) = @_; # In the future may pass in an options hash $type = $type->{type} if ref $type; "return PERL_constant_IS$type;"; } sub return_statement_for_notdef { # my ($self) = @_; "return PERL_constant_NOTDEF;"; } sub return_statement_for_notfound { # my ($self) = @_; "return PERL_constant_NOTFOUND;"; } sub default_type { 'IV'; } sub macro_from_name { my ($self, $item) = @_; my $macro = $item->{name}; $macro = $item->{value} unless defined $macro; $macro; } sub macro_from_item { my ($self, $item) = @_; my $macro = $item->{macro}; $macro = $self->macro_from_name($item) unless defined $macro; $macro; } # Keep to the traditional perl source macro sub memEQ { "memEQ"; } sub params { my ($self, $what) = @_; foreach (sort keys %$what) { warn "ExtUtils::Constant doesn't know how to handle values of type $_" unless defined $XS_Constant{$_}; } my $params = {}; $params->{''} = 1 if $what->{''}; $params->{IV} = 1 if $what->{IV} || $what->{UV} || $what->{PVN}; $params->{NV} = 1 if $what->{NV}; $params->{PV} = 1 if $what->{PV} || $what->{PVN}; $params->{SV} = 1 if $what->{SV}; return $params; } sub C_constant_prefix_param { "aTHX_ "; } sub C_constant_prefix_param_defintion { "pTHX_ "; } sub namelen_param_definition { 'STRLEN ' . $_[0] -> namelen_param; } sub C_constant_other_params_defintion { my ($self, $params) = @_; my $body = ''; $body .= ", int utf8" if $params->{''}; $body .= ", IV *iv_return" if $params->{IV}; $body .= ", NV *nv_return" if $params->{NV}; $body .= ", const char **pv_return" if $params->{PV}; $body .= ", SV **sv_return" if $params->{SV}; $body; } sub C_constant_other_params { my ($self, $params) = @_; my $body = ''; $body .= ", utf8" if $params->{''}; $body .= ", iv_return" if $params->{IV}; $body .= ", nv_return" if $params->{NV}; $body .= ", pv_return" if $params->{PV}; $body .= ", sv_return" if $params->{SV}; $body; } sub dogfood { my ($self, $args, @items) = @_; my ($package, $subname, $default_type, $what, $indent, $breakout) = @{$args}{qw(package subname default_type what indent breakout)}; my $result = <<"EOT"; /* When generated this function returned values for the list of names given in this section of perl code. Rather than manually editing these functions to add or remove constants, which would result in this comment and section of code becoming inaccurate, we recommend that you edit this section of code, and use it to regenerate a new set of constant functions which you then use to replace the originals. Regenerate these constant functions by feeding this entire source file to perl -x #!$^X -w use ExtUtils::Constant qw (constant_types C_constant XS_constant); EOT $result .= $self->dump_names ({default_type=>$default_type, what=>$what, indent=>0, declare_types=>1}, @items); $result .= <<'EOT'; print constant_types(), "\n"; # macro defs EOT $package = perl_stringify($package); $result .= "foreach (C_constant (\"$package\", '$subname', '$default_type', \$types, "; # The form of the indent parameter isn't defined. (Yet) if (defined $indent) { require Data::Dumper; $Data::Dumper::Terse=1; $Data::Dumper::Terse=1; # Not used once. :-) chomp ($indent = Data::Dumper::Dumper ($indent)); $result .= $indent; } else { $result .= 'undef'; } $result .= ", $breakout" . ', @names) ) { print $_, "\n"; # C constant subs } print "\n#### XS Section:\n"; print XS_constant ("' . $package . '", $types); __END__ */ '; $result; } 1; PK {0"\q% M M Constant/ProxySubs.pmnu �[��� package ExtUtils::Constant::ProxySubs; use strict; use vars qw($VERSION @ISA %type_to_struct %type_from_struct %type_to_sv %type_to_C_value %type_is_a_problem %type_num_args %type_temporary); use Carp; require ExtUtils::Constant::XS; use ExtUtils::Constant::Utils qw(C_stringify); use ExtUtils::Constant::XS qw(%XS_TypeSet); $VERSION = '0.09'; @ISA = 'ExtUtils::Constant::XS'; %type_to_struct = ( IV => '{const char *name; I32 namelen; IV value;}', NV => '{const char *name; I32 namelen; NV value;}', UV => '{const char *name; I32 namelen; UV value;}', PV => '{const char *name; I32 namelen; const char *value;}', PVN => '{const char *name; I32 namelen; const char *value; STRLEN len;}', YES => '{const char *name; I32 namelen;}', NO => '{const char *name; I32 namelen;}', UNDEF => '{const char *name; I32 namelen;}', '' => '{const char *name; I32 namelen;} ', ); %type_from_struct = ( IV => sub { $_[0] . '->value' }, NV => sub { $_[0] . '->value' }, UV => sub { $_[0] . '->value' }, PV => sub { $_[0] . '->value' }, PVN => sub { $_[0] . '->value', $_[0] . '->len' }, YES => sub {}, NO => sub {}, UNDEF => sub {}, '' => sub {}, ); %type_to_sv = ( IV => sub { "newSViv($_[0])" }, NV => sub { "newSVnv($_[0])" }, UV => sub { "newSVuv($_[0])" }, PV => sub { "newSVpv($_[0], 0)" }, PVN => sub { "newSVpvn($_[0], $_[1])" }, YES => sub { '&PL_sv_yes' }, NO => sub { '&PL_sv_no' }, UNDEF => sub { '&PL_sv_undef' }, '' => sub { '&PL_sv_yes' }, SV => sub {"SvREFCNT_inc($_[0])"}, ); %type_to_C_value = ( YES => sub {}, NO => sub {}, UNDEF => sub {}, '' => sub {}, ); sub type_to_C_value { my ($self, $type) = @_; return $type_to_C_value{$type} || sub {return map {ref $_ ? @$_ : $_} @_}; } # TODO - figure out if there is a clean way for the type_to_sv code to # attempt s/sv_2mortal// and if it succeeds tell type_to_sv not to add # SvREFCNT_inc %type_is_a_problem = ( # The documentation says *mortal SV*, but we now need a non-mortal copy. SV => 1, ); %type_temporary = ( SV => ['SV *'], PV => ['const char *'], PVN => ['const char *', 'STRLEN'], ); $type_temporary{$_} = [$_] foreach qw(IV UV NV); while (my ($type, $value) = each %XS_TypeSet) { $type_num_args{$type} = defined $value ? ref $value ? scalar @$value : 1 : 0; } $type_num_args{''} = 0; sub partition_names { my ($self, $default_type, @items) = @_; my (%found, @notfound, @trouble); while (my $item = shift @items) { my $default = delete $item->{default}; if ($default) { # If we find a default value, convert it into a regular item and # append it to the queue of items to process my $default_item = {%$item}; $default_item->{invert_macro} = 1; $default_item->{pre} = delete $item->{def_pre}; $default_item->{post} = delete $item->{def_post}; $default_item->{type} = shift @$default; $default_item->{value} = $default; push @items, $default_item; } else { # It can be "not found" unless it's the default (invert the macro) # or the "macro" is an empty string (ie no macro) push @notfound, $item unless $item->{invert_macro} or !$self->macro_to_ifdef($self->macro_from_item($item)); } if ($item->{pre} or $item->{post} or $item->{not_constant} or $type_is_a_problem{$item->{type}}) { push @trouble, $item; } else { push @{$found{$item->{type}}}, $item; } } # use Data::Dumper; print Dumper \%found; (\%found, \@notfound, \@trouble); } sub boottime_iterator { my ($self, $type, $iterator, $hash, $subname, $push) = @_; my $extractor = $type_from_struct{$type}; die "Can't find extractor code for type $type" unless defined $extractor; my $generator = $type_to_sv{$type}; die "Can't find generator code for type $type" unless defined $generator; my $athx = $self->C_constant_prefix_param(); if ($push) { return sprintf <<"EOBOOT", &$generator(&$extractor($iterator)); while ($iterator->name) { he = $subname($athx $hash, $iterator->name, $iterator->namelen, %s); av_push(push, newSVhek(HeKEY_hek(he))); ++$iterator; } EOBOOT } else { return sprintf <<"EOBOOT", &$generator(&$extractor($iterator)); while ($iterator->name) { $subname($athx $hash, $iterator->name, $iterator->namelen, %s); ++$iterator; } EOBOOT } } sub name_len_value_macro { my ($self, $item) = @_; my $name = $item->{name}; my $value = $item->{value}; $value = $item->{name} unless defined $value; my $namelen = length $name; if ($name =~ tr/\0-\377// != $namelen) { # the hash API signals UTF-8 by passing the length negated. utf8::encode($name); $namelen = -length $name; } $name = C_stringify($name); my $macro = $self->macro_from_item($item); ($name, $namelen, $value, $macro); } sub WriteConstants { my $self = shift; my $ARGS = {@_}; my ($c_fh, $xs_fh, $c_subname, $default_type, $package) = @{$ARGS}{qw(C_FH XS_FH C_SUBNAME DEFAULT_TYPE NAME)}; my $xs_subname = exists $ARGS->{XS_SUBNAME} ? $ARGS->{XS_SUBNAME} : 'constant'; my $options = $ARGS->{PROXYSUBS}; $options = {} unless ref $options; my $push = $options->{push}; my $explosives = $options->{croak_on_read}; my $croak_on_error = $options->{croak_on_error}; my $autoload = $options->{autoload}; { my $exclusive = 0; ++$exclusive if $explosives; ++$exclusive if $croak_on_error; ++$exclusive if $autoload; # Until someone patches this (with test cases): carp ("PROXYSUBS options 'autoload', 'croak_on_read' and 'croak_on_error' cannot be used together") if $exclusive > 1; } # Strictly it requires Perl_caller_cx carp ("PROXYSUBS option 'croak_on_error' requires v5.13.5 or later") if $croak_on_error && $^V < v5.13.5; # Strictly this is actually 5.8.9, but it's not well tested there my $can_do_pcs = $] >= 5.009; # Until someone patches this (with test cases) carp ("PROXYSUBS option 'push' requires v5.10 or later") if $push && !$can_do_pcs; # Until someone patches this (with test cases) carp ("PROXYSUBS options 'push' and 'croak_on_read' cannot be used together") if $explosives && $push; # If anyone is insane enough to suggest a package name containing % my $package_sprintf_safe = $package; $package_sprintf_safe =~ s/%/%%/g; # All the types we see my $what = {}; # A hash to lookup items with. my $items = {}; my @items = $self->normalise_items ({disable_utf8_duplication => 1}, $default_type, $what, $items, @{$ARGS->{NAMES}}); # Partition the values by type. Also include any defaults in here # Everything that doesn't have a default needs alternative code for # "I'm missing" # And everything that has pre or post code ends up in a private block my ($found, $notfound, $trouble) = $self->partition_names($default_type, @items); my $pthx = $self->C_constant_prefix_param_defintion(); my $athx = $self->C_constant_prefix_param(); my $symbol_table = C_stringify($package) . '::'; $push = C_stringify($package . '::' . $push) if $push; my $cast_CONSTSUB = $] < 5.010 ? '(char *)' : ''; print $c_fh $self->header(); if ($autoload || $croak_on_error) { print $c_fh <<'EOC'; /* This allows slightly more efficient code on !USE_ITHREADS: */ #ifdef USE_ITHREADS # define COP_FILE(c) CopFILE(c) # define COP_FILE_F "s" #else # define COP_FILE(c) CopFILESV(c) # define COP_FILE_F SVf #endif EOC } my $return_type = $push ? 'HE *' : 'void'; print $c_fh <<"EOADD"; static $return_type ${c_subname}_add_symbol($pthx HV *hash, const char *name, I32 namelen, SV *value) { EOADD if (!$can_do_pcs) { print $c_fh <<'EO_NOPCS'; if (namelen == namelen) { EO_NOPCS } else { print $c_fh <<"EO_PCS"; HE *he = (HE*) hv_common_key_len(hash, name, namelen, HV_FETCH_LVALUE, NULL, 0); SV *sv; if (!he) { croak("Couldn't add key '%s' to %%$package_sprintf_safe\::", name); } sv = HeVAL(he); if (SvOK(sv) || SvTYPE(sv) == SVt_PVGV) { /* Someone has been here before us - have to make a real sub. */ EO_PCS } # This piece of code is common to both print $c_fh <<"EOADD"; newCONSTSUB(hash, ${cast_CONSTSUB}name, value); EOADD if ($can_do_pcs) { print $c_fh <<'EO_PCS'; } else { SvUPGRADE(sv, SVt_RV); SvRV_set(sv, value); SvROK_on(sv); SvREADONLY_on(value); } EO_PCS } else { print $c_fh <<'EO_NOPCS'; } EO_NOPCS } print $c_fh " return he;\n" if $push; print $c_fh <<'EOADD'; } EOADD print $c_fh $explosives ? <<"EXPLODE" : "\n"; static int Im_sorry_Dave(pTHX_ SV *sv, MAGIC *mg) { PERL_UNUSED_ARG(mg); croak("Your vendor has not defined $package_sprintf_safe macro %"SVf " used", sv); NORETURN_FUNCTION_END; } static MGVTBL not_defined_vtbl = { Im_sorry_Dave, /* get - I'm afraid I can't do that */ Im_sorry_Dave, /* set */ 0, /* len */ 0, /* clear */ 0, /* free */ 0, /* copy */ 0, /* dup */ }; EXPLODE { my $key = $symbol_table; # Just seems tidier (and slightly more space efficient) not to have keys # such as Fcntl:: $key =~ s/::$//; my $key_len = length $key; print $c_fh <<"MISSING"; #ifndef SYMBIAN /* Store a hash of all symbols missing from the package. To avoid trampling on the package namespace (uninvited) put each package's hash in our namespace. To avoid creating lots of typeblogs and symbol tables for sub-packages, put each package's hash into one hash in our namespace. */ static HV * get_missing_hash(pTHX) { HV *const parent = get_hv("ExtUtils::Constant::ProxySubs::Missing", GVf_MULTI); /* We could make a hash of hashes directly, but this would confuse anything at Perl space that looks at us, and as we're visible in Perl space, best to play nice. */ SV *const *const ref = hv_fetch(parent, "$key", $key_len, TRUE); HV *new_hv; if (!ref) return NULL; if (SvROK(*ref)) return (HV*) SvRV(*ref); new_hv = newHV(); SvUPGRADE(*ref, SVt_RV); SvRV_set(*ref, (SV *)new_hv); SvROK_on(*ref); return new_hv; } #endif MISSING } print $xs_fh <<"EOBOOT"; BOOT: { #if defined(dTHX) && !defined(PERL_NO_GET_CONTEXT) dTHX; #endif HV *symbol_table = get_hv("$symbol_table", GV_ADD); EOBOOT if ($push) { print $xs_fh <<"EOC"; AV *push = get_av(\"$push\", GV_ADD); HE *he; EOC } my %iterator; $found->{''} = [map {{%$_, type=>'', invert_macro => 1}} @$notfound]; foreach my $type (sort keys %$found) { my $struct = $type_to_struct{$type}; my $type_to_value = $self->type_to_C_value($type); my $number_of_args = $type_num_args{$type}; die "Can't find structure definition for type $type" unless defined $struct; my $lc_type = $type ? lc($type) : 'notfound'; my $struct_type = $lc_type . '_s'; my $array_name = 'values_for_' . $lc_type; $iterator{$type} = 'value_for_' . $lc_type; # Give the notfound struct file scope. The others are scoped within the # BOOT block my $struct_fh = $type ? $xs_fh : $c_fh; print $c_fh "struct $struct_type $struct;\n"; print $struct_fh <<"EOBOOT"; static const struct $struct_type $array_name\[] = { EOBOOT foreach my $item (@{$found->{$type}}) { my ($name, $namelen, $value, $macro) = $self->name_len_value_macro($item); my $ifdef = $self->macro_to_ifdef($macro); if (!$ifdef && $item->{invert_macro}) { carp("Attempting to supply a default for '$name' which has no conditional macro"); next; } if ($item->{invert_macro}) { print $struct_fh $self->macro_to_ifndef($macro); print $struct_fh " /* This is the default value: */\n" if $type; } else { print $struct_fh $ifdef; } print $struct_fh " { ", join (', ', "\"$name\"", $namelen, &$type_to_value($value)), " },\n", $self->macro_to_endif($macro); } # Terminate the list with a NULL print $struct_fh " { NULL, 0", (", 0" x $number_of_args), " } };\n"; print $xs_fh <<"EOBOOT" if $type; const struct $struct_type *$iterator{$type} = $array_name; EOBOOT } delete $found->{''}; my $add_symbol_subname = $c_subname . '_add_symbol'; foreach my $type (sort keys %$found) { print $xs_fh $self->boottime_iterator($type, $iterator{$type}, 'symbol_table', $add_symbol_subname, $push); } print $xs_fh <<"EOBOOT"; if (C_ARRAY_LENGTH(values_for_notfound) > 1) { #ifndef SYMBIAN HV *const ${c_subname}_missing = get_missing_hash(aTHX); #endif const struct notfound_s *value_for_notfound = values_for_notfound; do { EOBOOT print $xs_fh $explosives ? <<"EXPLODE" : << "DONT"; SV *tripwire = newSV(0); sv_magicext(tripwire, 0, PERL_MAGIC_ext, ¬_defined_vtbl, 0, 0); SvPV_set(tripwire, (char *)value_for_notfound->name); if(value_for_notfound->namelen >= 0) { SvCUR_set(tripwire, value_for_notfound->namelen); } else { SvCUR_set(tripwire, -value_for_notfound->namelen); SvUTF8_on(tripwire); } SvPOKp_on(tripwire); SvREADONLY_on(tripwire); assert(SvLEN(tripwire) == 0); $add_symbol_subname($athx symbol_table, value_for_notfound->name, value_for_notfound->namelen, tripwire); EXPLODE /* Need to add prototypes, else parsing will vary by platform. */ HE *he = (HE*) hv_common_key_len(symbol_table, value_for_notfound->name, value_for_notfound->namelen, HV_FETCH_LVALUE, NULL, 0); SV *sv; #ifndef SYMBIAN HEK *hek; #endif if (!he) { croak("Couldn't add key '%s' to %%$package_sprintf_safe\::", value_for_notfound->name); } sv = HeVAL(he); if (!SvOK(sv) && SvTYPE(sv) != SVt_PVGV) { /* Nothing was here before, so mark a prototype of "" */ sv_setpvn(sv, "", 0); } else if (SvPOK(sv) && SvCUR(sv) == 0) { /* There is already a prototype of "" - do nothing */ } else { /* Someone has been here before us - have to make a real typeglob. */ /* It turns out to be incredibly hard to deal with all the corner cases of sub foo (); and reporting errors correctly, so lets cheat a bit. Start with a constant subroutine */ CV *cv = newCONSTSUB(symbol_table, ${cast_CONSTSUB}value_for_notfound->name, &PL_sv_yes); /* and then turn it into a non constant declaration only. */ SvREFCNT_dec(CvXSUBANY(cv).any_ptr); CvCONST_off(cv); CvXSUB(cv) = NULL; CvXSUBANY(cv).any_ptr = NULL; } #ifndef SYMBIAN hek = HeKEY_hek(he); if (!hv_common(${c_subname}_missing, NULL, HEK_KEY(hek), HEK_LEN(hek), HEK_FLAGS(hek), HV_FETCH_ISSTORE, &PL_sv_yes, HEK_HASH(hek))) croak("Couldn't add key '%s' to missing_hash", value_for_notfound->name); #endif DONT print $xs_fh " av_push(push, newSVhek(hek));\n" if $push; print $xs_fh <<"EOBOOT"; } while ((++value_for_notfound)->name); } EOBOOT foreach my $item (@$trouble) { my ($name, $namelen, $value, $macro) = $self->name_len_value_macro($item); my $ifdef = $self->macro_to_ifdef($macro); my $type = $item->{type}; my $type_to_value = $self->type_to_C_value($type); print $xs_fh $ifdef; if ($item->{invert_macro}) { print $xs_fh " /* This is the default value: */\n" if $type; print $xs_fh "#else\n"; } my $generator = $type_to_sv{$type}; die "Can't find generator code for type $type" unless defined $generator; print $xs_fh " {\n"; # We need to use a temporary value because some really troublesome # items use C pre processor directives in their values, and in turn # these don't fit nicely in the macro-ised generator functions my $counter = 0; printf $xs_fh " %s temp%d;\n", $_, $counter++ foreach @{$type_temporary{$type}}; print $xs_fh " $item->{pre}\n" if $item->{pre}; # And because the code in pre might be both declarations and # statements, we can't declare and assign to the temporaries in one. $counter = 0; printf $xs_fh " temp%d = %s;\n", $counter++, $_ foreach &$type_to_value($value); my @tempvarnames = map {sprintf 'temp%d', $_} 0 .. $counter - 1; printf $xs_fh <<"EOBOOT", $name, &$generator(@tempvarnames); ${c_subname}_add_symbol($athx symbol_table, "%s", $namelen, %s); EOBOOT print $xs_fh " $item->{post}\n" if $item->{post}; print $xs_fh " }\n"; print $xs_fh $self->macro_to_endif($macro); } if ($] >= 5.009) { print $xs_fh <<EOBOOT; /* As we've been creating subroutines, we better invalidate any cached methods */ mro_method_changed_in(symbol_table); } EOBOOT } else { print $xs_fh <<EOBOOT; /* As we've been creating subroutines, we better invalidate any cached methods */ ++PL_sub_generation; } EOBOOT } return if !defined $xs_subname; if ($croak_on_error || $autoload) { print $xs_fh $croak_on_error ? <<"EOC" : <<'EOA'; void $xs_subname(sv) INPUT: SV * sv; PREINIT: const PERL_CONTEXT *cx = caller_cx(0, NULL); /* cx is NULL if we've been called from the top level. PL_curcop isn't ideal, but it's much cheaper than other ways of not going SEGV. */ const COP *cop = cx ? cx->blk_oldcop : PL_curcop; EOC void AUTOLOAD() PROTOTYPE: DISABLE PREINIT: SV *sv = newSVpvn_flags(SvPVX(cv), SvCUR(cv), SVs_TEMP | SvUTF8(cv)); const COP *cop = PL_curcop; EOA print $xs_fh <<"EOC"; PPCODE: #ifndef SYMBIAN /* It's not obvious how to calculate this at C pre-processor time. However, any compiler optimiser worth its salt should be able to remove the dead code, and hopefully the now-obviously-unused static function too. */ HV *${c_subname}_missing = (C_ARRAY_LENGTH(values_for_notfound) > 1) ? get_missing_hash(aTHX) : NULL; if ((C_ARRAY_LENGTH(values_for_notfound) > 1) ? hv_exists_ent(${c_subname}_missing, sv, 0) : 0) { sv = newSVpvf("Your vendor has not defined $package_sprintf_safe macro %" SVf ", used at %" COP_FILE_F " line %" UVuf "\\n", sv, COP_FILE(cop), (UV)CopLINE(cop)); } else #endif { sv = newSVpvf("%" SVf " is not a valid $package_sprintf_safe macro at %" COP_FILE_F " line %" UVuf "\\n", sv, COP_FILE(cop), (UV)CopLINE(cop)); } croak_sv(sv_2mortal(sv)); EOC } else { print $xs_fh $explosives ? <<"EXPLODE" : <<"DONT"; void $xs_subname(sv) INPUT: SV * sv; PPCODE: sv = newSVpvf("Your vendor has not defined $package_sprintf_safe macro %" SVf ", used", sv); PUSHs(sv_2mortal(sv)); EXPLODE void $xs_subname(sv) INPUT: SV * sv; PPCODE: #ifndef SYMBIAN /* It's not obvious how to calculate this at C pre-processor time. However, any compiler optimiser worth its salt should be able to remove the dead code, and hopefully the now-obviously-unused static function too. */ HV *${c_subname}_missing = (C_ARRAY_LENGTH(values_for_notfound) > 1) ? get_missing_hash(aTHX) : NULL; if ((C_ARRAY_LENGTH(values_for_notfound) > 1) ? hv_exists_ent(${c_subname}_missing, sv, 0) : 0) { sv = newSVpvf("Your vendor has not defined $package_sprintf_safe macro %" SVf ", used", sv); } else #endif { sv = newSVpvf("%" SVf " is not a valid $package_sprintf_safe macro", sv); } PUSHs(sv_2mortal(sv)); DONT } } 1; PK {0"\��*� *� Constant/Base.pmnu �[��� package ExtUtils::Constant::Base; use strict; use vars qw($VERSION); use Carp; use Text::Wrap; use ExtUtils::Constant::Utils qw(C_stringify perl_stringify); $VERSION = '0.06'; use constant is_perl56 => ($] < 5.007 && $] > 5.005_50); =head1 NAME ExtUtils::Constant::Base - base class for ExtUtils::Constant objects =head1 SYNOPSIS require ExtUtils::Constant::Base; @ISA = 'ExtUtils::Constant::Base'; =head1 DESCRIPTION ExtUtils::Constant::Base provides a base implementation of methods to generate C code to give fast constant value lookup by named string. Currently it's mostly used ExtUtils::Constant::XS, which generates the lookup code for the constant() subroutine found in many XS modules. =head1 USAGE ExtUtils::Constant::Base exports no subroutines. The following methods are available =over 4 =cut sub valid_type { # Default to assuming that you don't need different types of return data. 1; } sub default_type { ''; } =item header A method returning a scalar containing definitions needed, typically for a C header file. =cut sub header { '' } # This might actually be a return statement. Note that you are responsible # for any space you might need before your value, as it lets to perform # "tricks" such as "return KEY_" and have strings appended. sub assignment_clause_for_type; # In which case this might be an empty string sub return_statement_for_type {undef}; sub return_statement_for_notdef; sub return_statement_for_notfound; # "#if 1" is true to a C pre-processor sub macro_from_name { 1; } sub macro_from_item { 1; } sub macro_to_ifdef { my ($self, $macro) = @_; if (ref $macro) { return $macro->[0]; } if (defined $macro && $macro ne "" && $macro ne "1") { return $macro ? "#ifdef $macro\n" : "#if 0\n"; } return ""; } sub macro_to_ifndef { my ($self, $macro) = @_; if (ref $macro) { # Can't invert these stylishly, so "bodge it" return "$macro->[0]#else\n"; } if (defined $macro && $macro ne "" && $macro ne "1") { return $macro ? "#ifndef $macro\n" : "#if 1\n"; } croak "Can't generate an ifndef for unconditional code"; } sub macro_to_endif { my ($self, $macro) = @_; if (ref $macro) { return $macro->[1]; } if (defined $macro && $macro ne "" && $macro ne "1") { return "#endif\n"; } return ""; } sub name_param { 'name'; } # This is possibly buggy, in that it's not mandatory (below, in the main # C_constant parameters, but is expected to exist here, if it's needed) # Buggy because if you're definitely pure 8 bit only, and will never be # presented with your constants in utf8, the default form of C_constant can't # be told not to do the utf8 version. sub is_utf8_param { 'utf8'; } sub memEQ { "!memcmp"; } =item memEQ_clause args_hashref A method to return a suitable C C<if> statement to check whether I<name> is equal to the C variable C<name>. If I<checked_at> is defined, then it is used to avoid C<memEQ> for short names, or to generate a comment to highlight the position of the character in the C<switch> statement. If i<checked_at> is a reference to a scalar, then instead it gives the characters pre-checked at the beginning, (and the number of chars by which the C variable name has been advanced. These need to be chopped from the front of I<name>). =cut sub memEQ_clause { # if (memEQ(name, "thingy", 6)) { # Which could actually be a character comparison or even "" my ($self, $args) = @_; my ($name, $checked_at, $indent) = @{$args}{qw(name checked_at indent)}; $indent = ' ' x ($indent || 4); my $front_chop; if (ref $checked_at) { # regexp won't work on 5.6.1 without use utf8; in turn that won't work # on 5.005_03. substr ($name, 0, length $$checked_at,) = ''; $front_chop = C_stringify ($$checked_at); undef $checked_at; } my $len = length $name; if ($len < 2) { return $indent . "{\n" if (defined $checked_at and $checked_at == 0) or $len == 0; # We didn't switch, drop through to the code for the 2 character string $checked_at = 1; } my $name_param = $self->name_param; if ($len < 3 and defined $checked_at) { my $check; if ($checked_at == 1) { $check = 0; } elsif ($checked_at == 0) { $check = 1; } if (defined $check) { my $char = C_stringify (substr $name, $check, 1); # Placate 5.005 with a break in the string. I can't see a good way of # getting it to not take [ as introducing an array lookup, even with # ${name_param}[$check] return $indent . "if ($name_param" . "[$check] == '$char') {\n"; } } if (($len == 2 and !defined $checked_at) or ($len == 3 and defined ($checked_at) and $checked_at == 2)) { my $char1 = C_stringify (substr $name, 0, 1); my $char2 = C_stringify (substr $name, 1, 1); return $indent . "if ($name_param" . "[0] == '$char1' && $name_param" . "[1] == '$char2') {\n"; } if (($len == 3 and defined ($checked_at) and $checked_at == 1)) { my $char1 = C_stringify (substr $name, 0, 1); my $char2 = C_stringify (substr $name, 2, 1); return $indent . "if ($name_param" . "[0] == '$char1' && $name_param" . "[2] == '$char2') {\n"; } my $pointer = '^'; my $have_checked_last = defined ($checked_at) && $len == $checked_at + 1; if ($have_checked_last) { # Checked at the last character, so no need to memEQ it. $pointer = C_stringify (chop $name); $len--; } $name = C_stringify ($name); my $memEQ = $self->memEQ(); my $body = $indent . "if ($memEQ($name_param, \"$name\", $len)) {\n"; # Put a little ^ under the letter we checked at # Screws up for non printable and non-7 bit stuff, but that's too hard to # get right. if (defined $checked_at) { $body .= $indent . "/* " . (' ' x length $memEQ) . (' ' x length $name_param) . (' ' x $checked_at) . $pointer . (' ' x ($len - $checked_at + length $len)) . " */\n"; } elsif (defined $front_chop) { $body .= $indent . "/* $front_chop" . (' ' x ($len + 1 + length $len)) . " */\n"; } return $body; } =item dump_names arg_hashref, ITEM... An internal function to generate the embedded perl code that will regenerate the constant subroutines. I<default_type>, I<types> and I<ITEM>s are the same as for C_constant. I<indent> is treated as number of spaces to indent by. If C<declare_types> is true a C<$types> is always declared in the perl code generated, if defined and false never declared, and if undefined C<$types> is only declared if the values in I<types> as passed in cannot be inferred from I<default_types> and the I<ITEM>s. =cut sub dump_names { my ($self, $args, @items) = @_; my ($default_type, $what, $indent, $declare_types) = @{$args}{qw(default_type what indent declare_types)}; $indent = ' ' x ($indent || 0); my $result; my (@simple, @complex, %used_types); foreach (@items) { my $type; if (ref $_) { $type = $_->{type} || $default_type; if ($_->{utf8}) { # For simplicity always skip the bytes case, and reconstitute this entry # from its utf8 twin. next if $_->{utf8} eq 'no'; # Copy the hashref, as we don't want to mess with the caller's hashref. $_ = {%$_}; unless (is_perl56) { utf8::decode ($_->{name}); } else { $_->{name} = pack 'U*', unpack 'U0U*', $_->{name}; } delete $_->{utf8}; } } else { $_ = {name=>$_}; $type = $default_type; } $used_types{$type}++; if ($type eq $default_type # grr 5.6.1 and length $_->{name} and length $_->{name} == ($_->{name} =~ tr/A-Za-z0-9_//) and !defined ($_->{macro}) and !defined ($_->{value}) and !defined ($_->{default}) and !defined ($_->{pre}) and !defined ($_->{post}) and !defined ($_->{def_pre}) and !defined ($_->{def_post}) and !defined ($_->{weight})) { # It's the default type, and the name consists only of A-Za-z0-9_ push @simple, $_->{name}; } else { push @complex, $_; } } if (!defined $declare_types) { # Do they pass in any types we weren't already using? foreach (keys %$what) { next if $used_types{$_}; $declare_types++; # Found one in $what that wasn't used. last; # And one is enough to terminate this loop } } if ($declare_types) { $result = $indent . 'my $types = {map {($_, 1)} qw(' . join (" ", sort keys %$what) . ")};\n"; } local $Text::Wrap::huge = 'overflow'; local $Text::Wrap::columns = 80; $result .= wrap ($indent . "my \@names = (qw(", $indent . " ", join (" ", sort @simple) . ")"); if (@complex) { foreach my $item (sort {$a->{name} cmp $b->{name}} @complex) { my $name = perl_stringify $item->{name}; my $line = ",\n$indent {name=>\"$name\""; $line .= ", type=>\"$item->{type}\"" if defined $item->{type}; foreach my $thing (qw (macro value default pre post def_pre def_post)) { my $value = $item->{$thing}; if (defined $value) { if (ref $value) { $line .= ", $thing=>[\"" . join ('", "', map {perl_stringify $_} @$value) . '"]'; } else { $line .= ", $thing=>\"" . perl_stringify($value) . "\""; } } } $line .= "}"; # Ensure that the enclosing C comment doesn't end # by turning */ into *" . "/ $line =~ s!\*\/!\*" . "/!gs; # gcc -Wall doesn't like finding /* inside a comment $line =~ s!\/\*!/" . "\*!gs; $result .= $line; } } $result .= ");\n"; $result; } =item assign arg_hashref, VALUE... A method to return a suitable assignment clause. If I<type> is aggregate (eg I<PVN> expects both pointer and length) then there should be multiple I<VALUE>s for the components. I<pre> and I<post> if defined give snippets of C code to proceed and follow the assignment. I<pre> will be at the start of a block, so variables may be defined in it. =cut # Hmm. value undef to do NOTDEF? value () to do NOTFOUND? sub assign { my $self = shift; my $args = shift; my ($indent, $type, $pre, $post, $item) = @{$args}{qw(indent type pre post item)}; $post ||= ''; my $clause; my $close; if ($pre) { chomp $pre; $close = "$indent}\n"; $clause = $indent . "{\n"; $indent .= " "; $clause .= "$indent$pre"; $clause .= ";" unless $pre =~ /;$/; $clause .= "\n"; } confess "undef \$type" unless defined $type; confess "Can't generate code for type $type" unless $self->valid_type($type); $clause .= join '', map {"$indent$_\n"} $self->assignment_clause_for_type({type=>$type,item=>$item}, @_); chomp $post; if (length $post) { $clause .= "$post"; $clause .= ";" unless $post =~ /;$/; $clause .= "\n"; } my $return = $self->return_statement_for_type($type); $clause .= "$indent$return\n" if defined $return; $clause .= $close if $close; return $clause; } =item return_clause arg_hashref, ITEM A method to return a suitable C<#ifdef> clause. I<ITEM> is a hashref (as passed to C<C_constant> and C<match_clause>. I<indent> is the number of spaces to indent, defaulting to 6. =cut sub return_clause { ##ifdef thingy # *iv_return = thingy; # return PERL_constant_ISIV; ##else # return PERL_constant_NOTDEF; ##endif my ($self, $args, $item) = @_; my $indent = $args->{indent}; my ($name, $value, $default, $pre, $post, $def_pre, $def_post, $type) = @$item{qw (name value default pre post def_pre def_post type)}; $value = $name unless defined $value; my $macro = $self->macro_from_item($item); $indent = ' ' x ($indent || 6); unless (defined $type) { # use Data::Dumper; print STDERR Dumper ($item); confess "undef \$type"; } ##ifdef thingy my $clause = $self->macro_to_ifdef($macro); # *iv_return = thingy; # return PERL_constant_ISIV; $clause .= $self->assign ({indent=>$indent, type=>$type, pre=>$pre, post=>$post, item=>$item}, ref $value ? @$value : $value); if (defined $macro && $macro ne "" && $macro ne "1") { ##else $clause .= "#else\n"; # return PERL_constant_NOTDEF; if (!defined $default) { my $notdef = $self->return_statement_for_notdef(); $clause .= "$indent$notdef\n" if defined $notdef; } else { my @default = ref $default ? @$default : $default; $type = shift @default; $clause .= $self->assign ({indent=>$indent, type=>$type, pre=>$pre, post=>$post, item=>$item}, @default); } } ##endif $clause .= $self->macro_to_endif($macro); return $clause; } sub match_clause { # $offset defined if we have checked an offset. my ($self, $args, $item) = @_; my ($offset, $indent) = @{$args}{qw(checked_at indent)}; $indent = ' ' x ($indent || 4); my $body = ''; my ($no, $yes, $either, $name, $inner_indent); if (ref $item eq 'ARRAY') { ($yes, $no) = @$item; $either = $yes || $no; confess "$item is $either expecting hashref in [0] || [1]" unless ref $either eq 'HASH'; $name = $either->{name}; } else { confess "$item->{name} has utf8 flag '$item->{utf8}', should be false" if $item->{utf8}; $name = $item->{name}; $inner_indent = $indent; } $body .= $self->memEQ_clause ({name => $name, checked_at => $offset, indent => length $indent}); # If we've been presented with an arrayref for $item, then the user string # contains in the range 128-255, and we need to check whether it was utf8 # (or not). # In the worst case we have two named constants, where one's name happens # encoded in UTF8 happens to be the same byte sequence as the second's # encoded in (say) ISO-8859-1. # In this case, $yes and $no both have item hashrefs. if ($yes) { $body .= $indent . " if (" . $self->is_utf8_param . ") {\n"; } elsif ($no) { $body .= $indent . " if (!" . $self->is_utf8_param . ") {\n"; } if ($either) { $body .= $self->return_clause ({indent=>4 + length $indent}, $either); if ($yes and $no) { $body .= $indent . " } else {\n"; $body .= $self->return_clause ({indent=>4 + length $indent}, $no); } $body .= $indent . " }\n"; } else { $body .= $self->return_clause ({indent=>2 + length $indent}, $item); } $body .= $indent . "}\n"; } =item switch_clause arg_hashref, NAMELEN, ITEMHASH, ITEM... An internal method to generate a suitable C<switch> clause, called by C<C_constant> I<ITEM>s are in the hash ref format as given in the description of C<C_constant>, and must all have the names of the same length, given by I<NAMELEN>. I<ITEMHASH> is a reference to a hash, keyed by name, values being the hashrefs in the I<ITEM> list. (No parameters are modified, and there can be keys in the I<ITEMHASH> that are not in the list of I<ITEM>s without causing problems - the hash is passed in to save generating it afresh for each call). =cut sub switch_clause { my ($self, $args, $namelen, $items, @items) = @_; my ($indent, $comment) = @{$args}{qw(indent comment)}; $indent = ' ' x ($indent || 2); local $Text::Wrap::huge = 'overflow'; local $Text::Wrap::columns = 80; my @names = sort map {$_->{name}} @items; my $leader = $indent . '/* '; my $follower = ' ' x length $leader; my $body = $indent . "/* Names all of length $namelen. */\n"; if (defined $comment) { $body = wrap ($leader, $follower, $comment) . "\n"; $leader = $follower; } my @safe_names = @names; foreach (@safe_names) { confess sprintf "Name '$_' is length %d, not $namelen", length unless length == $namelen; # Argh. 5.6.1 # next unless tr/A-Za-z0-9_//c; next if tr/A-Za-z0-9_// == length; $_ = '"' . perl_stringify ($_) . '"'; # Ensure that the enclosing C comment doesn't end # by turning */ into *" . "/ s!\*\/!\*"."/!gs; # gcc -Wall doesn't like finding /* inside a comment s!\/\*!/"."\*!gs; } $body .= wrap ($leader, $follower, join (" ", @safe_names) . " */") . "\n"; # Figure out what to switch on. # (RMS, Spread of jump table, Position, Hashref) my @best = (1e38, ~0); # Prefer the last character over the others. (As it lets us shorten the # memEQ clause at no cost). foreach my $i ($namelen - 1, 0 .. ($namelen - 2)) { my ($min, $max) = (~0, 0); my %spread; if (is_perl56) { # Need proper Unicode preserving hash keys for bytes in range 128-255 # here too, for some reason. grr 5.6.1 yet again. tie %spread, 'ExtUtils::Constant::Aaargh56Hash'; } foreach (@names) { my $char = substr $_, $i, 1; my $ord = ord $char; confess "char $ord is out of range" if $ord > 255; $max = $ord if $ord > $max; $min = $ord if $ord < $min; push @{$spread{$char}}, $_; # warn "$_ $char"; } # I'm going to pick the character to split on that minimises the root # mean square of the number of names in each case. Normally this should # be the one with the most keys, but it may pick a 7 where the 8 has # one long linear search. I'm not sure if RMS or just sum of squares is # actually better. # $max and $min are for the tie-breaker if the root mean squares match. # Assuming that the compiler may be building a jump table for the # switch() then try to minimise the size of that jump table. # Finally use < not <= so that if it still ties the earliest part of # the string wins. Because if that passes but the memEQ fails, it may # only need the start of the string to bin the choice. # I think. But I'm micro-optimising. :-) # OK. Trump that. Now favour the last character of the string, before the # rest. my $ss; $ss += @$_ * @$_ foreach values %spread; my $rms = sqrt ($ss / keys %spread); if ($rms < $best[0] || ($rms == $best[0] && ($max - $min) < $best[1])) { @best = ($rms, $max - $min, $i, \%spread); } } confess "Internal error. Failed to pick a switch point for @names" unless defined $best[2]; # use Data::Dumper; print Dumper (@best); my ($offset, $best) = @best[2,3]; $body .= $indent . "/* Offset $offset gives the best switch position. */\n"; my $do_front_chop = $offset == 0 && $namelen > 2; if ($do_front_chop) { $body .= $indent . "switch (*" . $self->name_param() . "++) {\n"; } else { $body .= $indent . "switch (" . $self->name_param() . "[$offset]) {\n"; } foreach my $char (sort keys %$best) { confess sprintf "'$char' is %d bytes long, not 1", length $char if length ($char) != 1; confess sprintf "char %#X is out of range", ord $char if ord ($char) > 255; $body .= $indent . "case '" . C_stringify ($char) . "':\n"; foreach my $thisone (sort { # Deal with the case of an item actually being an array ref to 1 or 2 # hashrefs. Don't assign to $a or $b, as they're aliases to the # original my $l = ref $a eq 'ARRAY' ? ($a->[0] || $->[1]) : $a; my $r = ref $b eq 'ARRAY' ? ($b->[0] || $->[1]) : $b; # Sort by weight first ($r->{weight} || 0) <=> ($l->{weight} || 0) # Sort equal weights by name or $l->{name} cmp $r->{name}} # If this looks evil, maybe it is. $items is a # hashref, and we're doing a hash slice on it @{$items}{@{$best->{$char}}}) { # warn "You are here"; if ($do_front_chop) { $body .= $self->match_clause ({indent => 2 + length $indent, checked_at => \$char}, $thisone); } else { $body .= $self->match_clause ({indent => 2 + length $indent, checked_at => $offset}, $thisone); } } $body .= $indent . " break;\n"; } $body .= $indent . "}\n"; return $body; } sub C_constant_return_type { "static int"; } sub C_constant_prefix_param { ''; } sub C_constant_prefix_param_defintion { ''; } sub name_param_definition { "const char *" . $_[0]->name_param; } sub namelen_param { 'len'; } sub namelen_param_definition { 'size_t ' . $_[0]->namelen_param; } sub C_constant_other_params { ''; } sub C_constant_other_params_defintion { ''; } =item params WHAT An "internal" method, subject to change, currently called to allow an overriding class to cache information that will then be passed into all the C<*param*> calls. (Yes, having to read the source to make sense of this is considered a known bug). I<WHAT> is be a hashref of types the constant function will return. In ExtUtils::Constant::XS this method is used to returns a hashref keyed IV NV PV SV to show which combination of pointers will be needed in the C argument list generated by C_constant_other_params_definition and C_constant_other_params =cut sub params { ''; } =item dogfood arg_hashref, ITEM... An internal function to generate the embedded perl code that will regenerate the constant subroutines. Parameters are the same as for C_constant. Currently the base class does nothing and returns an empty string. =cut sub dogfood { '' } =item normalise_items args, default_type, seen_types, seen_items, ITEM... Convert the items to a normalised form. For 8 bit and Unicode values converts the item to an array of 1 or 2 items, both 8 bit and UTF-8 encoded. =cut sub normalise_items { my $self = shift; my $args = shift; my $default_type = shift; my $what = shift; my $items = shift; my @new_items; foreach my $orig (@_) { my ($name, $item); if (ref $orig) { # Make a copy which is a normalised version of the ref passed in. $name = $orig->{name}; my ($type, $macro, $value) = @$orig{qw (type macro value)}; $type ||= $default_type; $what->{$type} = 1; $item = {name=>$name, type=>$type}; undef $macro if defined $macro and $macro eq $name; $item->{macro} = $macro if defined $macro; undef $value if defined $value and $value eq $name; $item->{value} = $value if defined $value; foreach my $key (qw(default pre post def_pre def_post weight not_constant)) { my $value = $orig->{$key}; $item->{$key} = $value if defined $value; # warn "$key $value"; } } else { $name = $orig; $item = {name=>$name, type=>$default_type}; $what->{$default_type} = 1; } warn +(ref ($self) || $self) . "doesn't know how to handle values of type $_ used in macro $name" unless $self->valid_type ($item->{type}); # tr///c is broken on 5.6.1 for utf8, so my original tr/\0-\177//c # doesn't work. Upgrade to 5.8 # if ($name !~ tr/\0-\177//c || $] < 5.005_50) { if ($name =~ tr/\0-\177// == length $name || $] < 5.005_50 || $args->{disable_utf8_duplication}) { # No characters outside 7 bit ASCII. if (exists $items->{$name}) { die "Multiple definitions for macro $name"; } $items->{$name} = $item; } else { # No characters outside 8 bit. This is hardest. if (exists $items->{$name} and ref $items->{$name} ne 'ARRAY') { confess "Unexpected ASCII definition for macro $name"; } # Again, 5.6.1 tr broken, so s/5\.6.*/5\.8\.0/; # if ($name !~ tr/\0-\377//c) { if ($name =~ tr/\0-\377// == length $name) { # if ($] < 5.007) { # $name = pack "C*", unpack "U*", $name; # } $item->{utf8} = 'no'; $items->{$name}[1] = $item; push @new_items, $item; # Copy item, to create the utf8 variant. $item = {%$item}; } # Encode the name as utf8 bytes. unless (is_perl56) { utf8::encode($name); } else { # warn "Was >$name< " . length ${name}; $name = pack 'C*', unpack 'C*', $name . pack 'U*'; # warn "Now '${name}' " . length ${name}; } if ($items->{$name}[0]) { die "Multiple definitions for macro $name"; } $item->{utf8} = 'yes'; $item->{name} = $name; $items->{$name}[0] = $item; # We have need for the utf8 flag. $what->{''} = 1; } push @new_items, $item; } @new_items; } =item C_constant arg_hashref, ITEM... A function that returns a B<list> of C subroutine definitions that return the value and type of constants when passed the name by the XS wrapper. I<ITEM...> gives a list of constant names. Each can either be a string, which is taken as a C macro name, or a reference to a hash with the following keys =over 8 =item name The name of the constant, as seen by the perl code. =item type The type of the constant (I<IV>, I<NV> etc) =item value A C expression for the value of the constant, or a list of C expressions if the type is aggregate. This defaults to the I<name> if not given. =item macro The C pre-processor macro to use in the C<#ifdef>. This defaults to the I<name>, and is mainly used if I<value> is an C<enum>. If a reference an array is passed then the first element is used in place of the C<#ifdef> line, and the second element in place of the C<#endif>. This allows pre-processor constructions such as #if defined (foo) #if !defined (bar) ... #endif #endif to be used to determine if a constant is to be defined. A "macro" 1 signals that the constant is always defined, so the C<#if>/C<#endif> test is omitted. =item default Default value to use (instead of C<croak>ing with "your vendor has not defined...") to return if the macro isn't defined. Specify a reference to an array with type followed by value(s). =item pre C code to use before the assignment of the value of the constant. This allows you to use temporary variables to extract a value from part of a C<struct> and return this as I<value>. This C code is places at the start of a block, so you can declare variables in it. =item post C code to place between the assignment of value (to a temporary) and the return from the function. This allows you to clear up anything in I<pre>. Rarely needed. =item def_pre =item def_post Equivalents of I<pre> and I<post> for the default value. =item utf8 Generated internally. Is zero or undefined if name is 7 bit ASCII, "no" if the name is 8 bit (and so should only match if SvUTF8() is false), "yes" if the name is utf8 encoded. The internals automatically clone any name with characters 128-255 but none 256+ (ie one that could be either in bytes or utf8) into a second entry which is utf8 encoded. =item weight Optional sorting weight for names, to determine the order of linear testing when multiple names fall in the same case of a switch clause. Higher comes earlier, undefined defaults to zero. =back In the argument hashref, I<package> is the name of the package, and is only used in comments inside the generated C code. I<subname> defaults to C<constant> if undefined. I<default_type> is the type returned by C<ITEM>s that don't specify their type. It defaults to the value of C<default_type()>. I<types> should be given either as a comma separated list of types that the C subroutine I<subname> will generate or as a reference to a hash. I<default_type> will be added to the list if not present, as will any types given in the list of I<ITEM>s. The resultant list should be the same list of types that C<XS_constant> is given. [Otherwise C<XS_constant> and C<C_constant> may differ in the number of parameters to the constant function. I<indent> is currently unused and ignored. In future it may be used to pass in information used to change the C indentation style used.] The best way to maintain consistency is to pass in a hash reference and let this function update it. I<breakout> governs when child functions of I<subname> are generated. If there are I<breakout> or more I<ITEM>s with the same length of name, then the code to switch between them is placed into a function named I<subname>_I<len>, for example C<constant_5> for names 5 characters long. The default I<breakout> is 3. A single C<ITEM> is always inlined. =cut # The parameter now BREAKOUT was previously documented as: # # I<NAMELEN> if defined signals that all the I<name>s of the I<ITEM>s are of # this length, and that the constant name passed in by perl is checked and # also of this length. It is used during recursion, and should be C<undef> # unless the caller has checked all the lengths during code generation, and # the generated subroutine is only to be called with a name of this length. # # As you can see it now performs this function during recursion by being a # scalar reference. sub C_constant { my ($self, $args, @items) = @_; my ($package, $subname, $default_type, $what, $indent, $breakout) = @{$args}{qw(package subname default_type types indent breakout)}; $package ||= 'Foo'; $subname ||= 'constant'; # I'm not using this. But a hashref could be used for full formatting without # breaking this API # $indent ||= 0; my ($namelen, $items); if (ref $breakout) { # We are called recursively. We trust @items to be normalised, $what to # be a hashref, and pinch %$items from our parent to save recalculation. ($namelen, $items) = @$breakout; } else { $items = {}; if (is_perl56) { # Need proper Unicode preserving hash keys. require ExtUtils::Constant::Aaargh56Hash; tie %$items, 'ExtUtils::Constant::Aaargh56Hash'; } $breakout ||= 3; $default_type ||= $self->default_type(); if (!ref $what) { # Convert line of the form IV,UV,NV to hash $what = {map {$_ => 1} split /,\s*/, ($what || '')}; # Figure out what types we're dealing with, and assign all unknowns to the # default type } @items = $self->normalise_items ({}, $default_type, $what, $items, @items); # use Data::Dumper; print Dumper @items; } my $params = $self->params ($what); # Probably "static int" my ($body, @subs); $body = $self->C_constant_return_type($params) . "\n$subname (" # Eg "pTHX_ " . $self->C_constant_prefix_param_defintion($params) # Probably "const char *name" . $self->name_param_definition($params); # Something like ", STRLEN len" $body .= ", " . $self->namelen_param_definition($params) unless defined $namelen; $body .= $self->C_constant_other_params_defintion($params); $body .= ") {\n"; if (defined $namelen) { # We are a child subroutine. Print the simple description my $comment = 'When generated this function returned values for the list' . ' of names given here. However, subsequent manual editing may have' . ' added or removed some.'; $body .= $self->switch_clause ({indent=>2, comment=>$comment}, $namelen, $items, @items); } else { # We are the top level. $body .= " /* Initially switch on the length of the name. */\n"; $body .= $self->dogfood ({package => $package, subname => $subname, default_type => $default_type, what => $what, indent => $indent, breakout => $breakout}, @items); $body .= ' switch ('.$self->namelen_param().") {\n"; # Need to group names of the same length my @by_length; foreach (@items) { push @{$by_length[length $_->{name}]}, $_; } foreach my $i (0 .. $#by_length) { next unless $by_length[$i]; # None of this length $body .= " case $i:\n"; if (@{$by_length[$i]} == 1) { my $only_thing = $by_length[$i]->[0]; if ($only_thing->{utf8}) { if ($only_thing->{utf8} eq 'yes') { # With utf8 on flag item is passed in element 0 $body .= $self->match_clause (undef, [$only_thing]); } else { # With utf8 off flag item is passed in element 1 $body .= $self->match_clause (undef, [undef, $only_thing]); } } else { $body .= $self->match_clause (undef, $only_thing); } } elsif (@{$by_length[$i]} < $breakout) { $body .= $self->switch_clause ({indent=>4}, $i, $items, @{$by_length[$i]}); } else { # Only use the minimal set of parameters actually needed by the types # of the names of this length. my $what = {}; foreach (@{$by_length[$i]}) { $what->{$_->{type}} = 1; $what->{''} = 1 if $_->{utf8}; } $params = $self->params ($what); push @subs, $self->C_constant ({package=>$package, subname=>"${subname}_$i", default_type => $default_type, types => $what, indent => $indent, breakout => [$i, $items]}, @{$by_length[$i]}); $body .= " return ${subname}_$i (" # Eg "aTHX_ " . $self->C_constant_prefix_param($params) # Probably "name" . $self->name_param($params); $body .= $self->C_constant_other_params($params); $body .= ");\n"; } $body .= " break;\n"; } $body .= " }\n"; } my $notfound = $self->return_statement_for_notfound(); $body .= " $notfound\n" if $notfound; $body .= "}\n"; return (@subs, $body); } 1; __END__ =back =head1 BUGS Not everything is documented yet. Probably others. =head1 AUTHOR Nicholas Clark <nick@ccl4.org> based on the code in C<h2xs> by Larry Wall and others PK {0"\��du�: �: Constant.pmnu �[��� package ExtUtils::Constant; use vars qw (@ISA $VERSION @EXPORT_OK %EXPORT_TAGS); $VERSION = '0.25'; =head1 NAME ExtUtils::Constant - generate XS code to import C header constants =head1 SYNOPSIS use ExtUtils::Constant qw (WriteConstants); WriteConstants( NAME => 'Foo', NAMES => [qw(FOO BAR BAZ)], ); # Generates wrapper code to make the values of the constants FOO BAR BAZ # available to perl =head1 DESCRIPTION ExtUtils::Constant facilitates generating C and XS wrapper code to allow perl modules to AUTOLOAD constants defined in C library header files. It is principally used by the C<h2xs> utility, on which this code is based. It doesn't contain the routines to scan header files to extract these constants. =head1 USAGE Generally one only needs to call the C<WriteConstants> function, and then #include "const-c.inc" in the C section of C<Foo.xs> INCLUDE: const-xs.inc in the XS section of C<Foo.xs>. For greater flexibility use C<constant_types()>, C<C_constant> and C<XS_constant>, with which C<WriteConstants> is implemented. Currently this module understands the following types. h2xs may only know a subset. The sizes of the numeric types are chosen by the C<Configure> script at compile time. =over 4 =item IV signed integer, at least 32 bits. =item UV unsigned integer, the same size as I<IV> =item NV floating point type, probably C<double>, possibly C<long double> =item PV NUL terminated string, length will be determined with C<strlen> =item PVN A fixed length thing, given as a [pointer, length] pair. If you know the length of a string at compile time you may use this instead of I<PV> =item SV A B<mortal> SV. =item YES Truth. (C<PL_sv_yes>) The value is not needed (and ignored). =item NO Defined Falsehood. (C<PL_sv_no>) The value is not needed (and ignored). =item UNDEF C<undef>. The value of the macro is not needed. =back =head1 FUNCTIONS =over 4 =cut if ($] >= 5.006) { eval "use warnings; 1" or die $@; } use strict; use Carp qw(croak cluck); use Exporter; use ExtUtils::Constant::Utils qw(C_stringify); use ExtUtils::Constant::XS qw(%XS_Constant %XS_TypeSet); @ISA = 'Exporter'; %EXPORT_TAGS = ( 'all' => [ qw( XS_constant constant_types return_clause memEQ_clause C_stringify C_constant autoload WriteConstants WriteMakefileSnippet ) ] ); @EXPORT_OK = ( @{ $EXPORT_TAGS{'all'} } ); =item constant_types A function returning a single scalar with C<#define> definitions for the constants used internally between the generated C and XS functions. =cut sub constant_types { ExtUtils::Constant::XS->header(); } sub memEQ_clause { cluck "ExtUtils::Constant::memEQ_clause is deprecated"; ExtUtils::Constant::XS->memEQ_clause({name=>$_[0], checked_at=>$_[1], indent=>$_[2]}); } sub return_clause ($$) { cluck "ExtUtils::Constant::return_clause is deprecated"; my $indent = shift; ExtUtils::Constant::XS->return_clause({indent=>$indent}, @_); } sub switch_clause { cluck "ExtUtils::Constant::switch_clause is deprecated"; my $indent = shift; my $comment = shift; ExtUtils::Constant::XS->switch_clause({indent=>$indent, comment=>$comment}, @_); } sub C_constant { my ($package, $subname, $default_type, $what, $indent, $breakout, @items) = @_; ExtUtils::Constant::XS->C_constant({package => $package, subname => $subname, default_type => $default_type, types => $what, indent => $indent, breakout => $breakout}, @items); } =item XS_constant PACKAGE, TYPES, XS_SUBNAME, C_SUBNAME A function to generate the XS code to implement the perl subroutine I<PACKAGE>::constant used by I<PACKAGE>::AUTOLOAD to load constants. This XS code is a wrapper around a C subroutine usually generated by C<C_constant>, and usually named C<constant>. I<TYPES> should be given either as a comma separated list of types that the C subroutine C<constant> will generate or as a reference to a hash. It should be the same list of types as C<C_constant> was given. [Otherwise C<XS_constant> and C<C_constant> may have different ideas about the number of parameters passed to the C function C<constant>] You can call the perl visible subroutine something other than C<constant> if you give the parameter I<XS_SUBNAME>. The C subroutine it calls defaults to the name of the perl visible subroutine, unless you give the parameter I<C_SUBNAME>. =cut sub XS_constant { my $package = shift; my $what = shift; my $XS_subname = shift; my $C_subname = shift; $XS_subname ||= 'constant'; $C_subname ||= $XS_subname; if (!ref $what) { # Convert line of the form IV,UV,NV to hash $what = {map {$_ => 1} split /,\s*/, ($what)}; } my $params = ExtUtils::Constant::XS->params ($what); my $type; my $xs = <<"EOT"; void $XS_subname(sv) PREINIT: #ifdef dXSTARG dXSTARG; /* Faster if we have it. */ #else dTARGET; #endif STRLEN len; int type; EOT if ($params->{IV}) { $xs .= " IV iv = 0; /* avoid uninit var warning */\n"; } else { $xs .= " /* IV\t\tiv;\tUncomment this if you need to return IVs */\n"; } if ($params->{NV}) { $xs .= " NV nv = 0.0; /* avoid uninit var warning */\n"; } else { $xs .= " /* NV\t\tnv;\tUncomment this if you need to return NVs */\n"; } if ($params->{PV}) { $xs .= " const char *pv = NULL; /* avoid uninit var warning */\n"; } else { $xs .= " /* const char\t*pv;\tUncomment this if you need to return PVs */\n"; } $xs .= << 'EOT'; INPUT: SV * sv; const char * s = SvPV(sv, len); EOT if ($params->{''}) { $xs .= << 'EOT'; INPUT: int utf8 = SvUTF8(sv); EOT } $xs .= << 'EOT'; PPCODE: EOT if ($params->{IV} xor $params->{NV}) { $xs .= << "EOT"; /* Change this to $C_subname(aTHX_ s, len, &iv, &nv); if you need to return both NVs and IVs */ EOT } $xs .= " type = $C_subname(aTHX_ s, len"; $xs .= ', utf8' if $params->{''}; $xs .= ', &iv' if $params->{IV}; $xs .= ', &nv' if $params->{NV}; $xs .= ', &pv' if $params->{PV}; $xs .= ', &sv' if $params->{SV}; $xs .= ");\n"; # If anyone is insane enough to suggest a package name containing % my $package_sprintf_safe = $package; $package_sprintf_safe =~ s/%/%%/g; $xs .= << "EOT"; /* Return 1 or 2 items. First is error message, or undef if no error. Second, if present, is found value */ switch (type) { case PERL_constant_NOTFOUND: sv = sv_2mortal(newSVpvf("%s is not a valid $package_sprintf_safe macro", s)); PUSHs(sv); break; case PERL_constant_NOTDEF: sv = sv_2mortal(newSVpvf( "Your vendor has not defined $package_sprintf_safe macro %s, used", s)); PUSHs(sv); break; EOT foreach $type (sort keys %XS_Constant) { # '' marks utf8 flag needed. next if $type eq ''; $xs .= "\t/* Uncomment this if you need to return ${type}s\n" unless $what->{$type}; $xs .= " case PERL_constant_IS$type:\n"; if (length $XS_Constant{$type}) { $xs .= << "EOT"; EXTEND(SP, 2); PUSHs(&PL_sv_undef); $XS_Constant{$type}; EOT } else { # Do nothing. return (), which will be correctly interpreted as # (undef, undef) } $xs .= " break;\n"; unless ($what->{$type}) { chop $xs; # Yes, another need for chop not chomp. $xs .= " */\n"; } } $xs .= << "EOT"; default: sv = sv_2mortal(newSVpvf( "Unexpected return type %d while processing $package_sprintf_safe macro %s, used", type, s)); PUSHs(sv); } EOT return $xs; } =item autoload PACKAGE, VERSION, AUTOLOADER A function to generate the AUTOLOAD subroutine for the module I<PACKAGE> I<VERSION> is the perl version the code should be backwards compatible with. It defaults to the version of perl running the subroutine. If I<AUTOLOADER> is true, the AUTOLOAD subroutine falls back on AutoLoader::AUTOLOAD for all names that the constant() routine doesn't recognise. =cut # ' # Grr. syntax highlighters that don't grok pod. sub autoload { my ($module, $compat_version, $autoloader) = @_; $compat_version ||= $]; croak "Can't maintain compatibility back as far as version $compat_version" if $compat_version < 5; my $func = "sub AUTOLOAD {\n" . " # This AUTOLOAD is used to 'autoload' constants from the constant()\n" . " # XS function."; $func .= " If a constant is not found then control is passed\n" . " # to the AUTOLOAD in AutoLoader." if $autoloader; $func .= "\n\n" . " my \$constname;\n"; $func .= " our \$AUTOLOAD;\n" if ($compat_version >= 5.006); $func .= <<"EOT"; (\$constname = \$AUTOLOAD) =~ s/.*:://; croak "&${module}::constant not defined" if \$constname eq 'constant'; my (\$error, \$val) = constant(\$constname); EOT if ($autoloader) { $func .= <<'EOT'; if ($error) { if ($error =~ /is not a valid/) { $AutoLoader::AUTOLOAD = $AUTOLOAD; goto &AutoLoader::AUTOLOAD; } else { croak $error; } } EOT } else { $func .= " if (\$error) { croak \$error; }\n"; } $func .= <<'END'; { no strict 'refs'; # Fixed between 5.005_53 and 5.005_61 #XXX if ($] >= 5.00561) { #XXX *$AUTOLOAD = sub () { $val }; #XXX } #XXX else { *$AUTOLOAD = sub { $val }; #XXX } } goto &$AUTOLOAD; } END return $func; } =item WriteMakefileSnippet WriteMakefileSnippet ATTRIBUTE =E<gt> VALUE [, ...] A function to generate perl code for Makefile.PL that will regenerate the constant subroutines. Parameters are named as passed to C<WriteConstants>, with the addition of C<INDENT> to specify the number of leading spaces (default 2). Currently only C<INDENT>, C<NAME>, C<DEFAULT_TYPE>, C<NAMES>, C<C_FILE> and C<XS_FILE> are recognised. =cut sub WriteMakefileSnippet { my %args = @_; my $indent = $args{INDENT} || 2; my $result = <<"EOT"; ExtUtils::Constant::WriteConstants( NAME => '$args{NAME}', NAMES => \\\@names, DEFAULT_TYPE => '$args{DEFAULT_TYPE}', EOT foreach (qw (C_FILE XS_FILE)) { next unless exists $args{$_}; $result .= sprintf " %-12s => '%s',\n", $_, $args{$_}; } $result .= <<'EOT';
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