ExtUtils::Typemaps(3perl) Perl Programmers Reference Guide ExtUtils::Typemaps(3perl)

ExtUtils::Typemaps - Read/Write/Modify Perl/XS typemap files

# read/create file
my $typemap = ExtUtils::Typemaps->new(file => 'typemap');
# alternatively create an in-memory typemap
# $typemap = ExtUtils::Typemaps->new();
# alternatively create an in-memory typemap by parsing a string
# $typemap = ExtUtils::Typemaps->new(string => $sometypemap);

# add a mapping
$typemap->add_typemap(ctype => 'NV', xstype => 'T_NV');
$typemap->add_inputmap(
   xstype => 'T_NV', code => '$var = ($type)SvNV($arg);'
);
$typemap->add_outputmap(
   xstype => 'T_NV', code => 'sv_setnv($arg, (NV)$var);'
);
$typemap->add_string(string => $typemapstring);
                                         # will be parsed and merged

# remove a mapping (same for remove_typemap and remove_outputmap...)
$typemap->remove_inputmap(xstype => 'SomeType');

# save a typemap to a file
$typemap->write(file => 'anotherfile.map');

# merge the other typemap into this one
$typemap->merge(typemap => $another_typemap);

This module can read, modify, create and write Perl XS typemap files. If you don't know what a typemap is, please confer the perlxstut and perlxs manuals.

The module is not entirely round-trip safe: For example it currently simply strips all comments. The order of entries in the maps is, however, preserved.

We check for duplicate entries in the typemap, but do not check for missing "TYPEMAP" entries for "INPUTMAP" or "OUTPUTMAP" entries since these might be hidden in a different typemap.

Returns a new typemap object. Takes an optional "file" parameter. If set, the given file will be read. If the file doesn't exist, an empty typemap is returned.

Alternatively, if the "string" parameter is given, the supplied string will be parsed instead of a file.

Get/set the file that the typemap is written to when the "write" method is called.

Add a "TYPEMAP" entry to the typemap.

Required named arguments: The "ctype" (e.g. "ctype => 'double'") and the "xstype" (e.g. "xstype => 'T_NV'").

Optional named arguments: "replace => 1" forces removal/replacement of existing "TYPEMAP" entries of the same "ctype". "skip => 1" triggers a "first come first serve" logic by which new entries that conflict with existing entries are silently ignored.

As an alternative to the named parameters usage, you may pass in an "ExtUtils::Typemaps::Type" object as first argument, a copy of which will be added to the typemap. In that case, only the "replace" or "skip" named parameters may be used after the object. Example:

$map->add_typemap($type_obj, replace => 1);

Add an "INPUT" entry to the typemap.

Required named arguments: The "xstype" (e.g. "xstype => 'T_NV'") and the "code" to associate with it for input.

Optional named arguments: "replace => 1" forces removal/replacement of existing "INPUT" entries of the same "xstype". "skip => 1" triggers a "first come first serve" logic by which new entries that conflict with existing entries are silently ignored.

As an alternative to the named parameters usage, you may pass in an "ExtUtils::Typemaps::InputMap" object as first argument, a copy of which will be added to the typemap. In that case, only the "replace" or "skip" named parameters may be used after the object. Example:

$map->add_inputmap($type_obj, replace => 1);

Add an "OUTPUT" entry to the typemap. Works exactly the same as "add_inputmap".

Parses a string as a typemap and merge it into the typemap object.

Required named argument: "string" to specify the string to parse.

Removes a "TYPEMAP" entry from the typemap.

Required named argument: "ctype" to specify the entry to remove from the typemap.

Alternatively, you may pass a single "ExtUtils::Typemaps::Type" object.

Removes an "INPUT" entry from the typemap.

Required named argument: "xstype" to specify the entry to remove from the typemap.

Alternatively, you may pass a single "ExtUtils::Typemaps::InputMap" object.

Removes an "OUTPUT" entry from the typemap.

Required named argument: "xstype" to specify the entry to remove from the typemap.

Alternatively, you may pass a single "ExtUtils::Typemaps::OutputMap" object.

Fetches an entry of the TYPEMAP section of the typemap.

Mandatory named arguments: The "ctype" of the entry.

Returns the "ExtUtils::Typemaps::Type" object for the entry if found.

Fetches an entry of the INPUT section of the typemap.

Mandatory named arguments: The "xstype" of the entry or the "ctype" of the typemap that can be used to find the "xstype". To wit, the following pieces of code are equivalent:

my $type = $typemap->get_typemap(ctype => $ctype)
my $input_map = $typemap->get_inputmap(xstype => $type->xstype);

my $input_map = $typemap->get_inputmap(ctype => $ctype);

Returns the "ExtUtils::Typemaps::InputMap" object for the entry if found.

Fetches an entry of the OUTPUT section of the typemap.

Mandatory named arguments: The "xstype" of the entry or the "ctype" of the typemap that can be used to resolve the "xstype". (See above for an example.)

Returns the "ExtUtils::Typemaps::InputMap" object for the entry if found.

Write the typemap to a file. Optionally takes a "file" argument. If given, the typemap will be written to the specified file. If not, the typemap is written to the currently stored file name (see "file" above, this defaults to the file it was read from if any).

Generates and returns the string form of the typemap.

Generates and returns the string form of the typemap with the appropriate prefix around it for verbatim inclusion into an XS file as an embedded typemap. This will return a string like

TYPEMAP: <<END_OF_TYPEMAP
... typemap here (see as_string) ...
END_OF_TYPEMAP

The method takes care not to use a HERE-doc end marker that appears in the typemap string itself.

Merges a given typemap into the object. Note that a failed merge operation leaves the object in an inconsistent state so clone it if necessary.

Mandatory named arguments: Either "typemap => $another_typemap_obj" or "file => $path_to_typemap_file" but not both.

Optional arguments: "replace => 1" to force replacement of existing typemap entries without warning or "skip => 1" to skip entries that exist already in the typemap.

Returns a bool indicating whether this typemap is entirely empty.

Returns a list of the C types that are mappable by this typemap object.

Returns a hash mapping the C types to the XS types:

{
  'char **' => 'T_PACKEDARRAY',
  'bool_t' => 'T_IV',
  'AV *' => 'T_AVREF',
  'InputStream' => 'T_IN',
  'double' => 'T_DOUBLE',
  # ...
}

This is documented because it is used by "ExtUtils::ParseXS", but it's not intended for general consumption. May be removed at any time.

Returns a hash mapping the XS types (identifiers) to the corresponding INPUT code:

{
  'T_CALLBACK' => '   $var = make_perl_cb_$type($arg)
',
  'T_OUT' => '    $var = IoOFP(sv_2io($arg))
',
  'T_REF_IV_PTR' => '   if (sv_isa($arg, \\"${ntype}\\")) {
  # ...
}

This is documented because it is used by "ExtUtils::ParseXS", but it's not intended for general consumption. May be removed at any time.

Returns a hash mapping the XS types (identifiers) to the corresponding OUTPUT code:

{
  'T_CALLBACK' => '   sv_setpvn($arg, $var.context.value().chp(),
              $var.context.value().size());
',
  'T_OUT' => '    {
          GV *gv = (GV *)sv_newmortal();
          gv_init_pvn(gv, gv_stashpvs("$Package",1),
                     "__ANONIO__",10,0);
          if ( do_open(gv, "+>&", 3, FALSE, 0, 0, $var) )
              sv_setsv(
                $arg,
                sv_bless(newRV((SV*)gv), gv_stashpv("$Package",1))
              );
          else
              $arg = &PL_sv_undef;
       }
',
  # ...
}

This is documented because it is used by "ExtUtils::ParseXS", but it's not intended for general consumption. May be removed at any time.

Returns a hash mapping the C types of the typemap to their corresponding prototypes.

{
  'char **' => '$',
  'bool_t' => '$',
  'AV *' => '$',
  'InputStream' => '$',
  'double' => '$',
  # ...
}

This is documented because it is used by "ExtUtils::ParseXS", but it's not intended for general consumption. May be removed at any time.

Creates and returns a clone of a full typemaps object.

Takes named parameters: If "shallow" is true, the clone will share the actual individual type/input/outputmap objects, but not share their storage. Use with caution. Without "shallow", the clone will be fully independent.

Function to (heuristically) canonicalize a C type. Works to some degree with C++ types.

$halfway_canonical_type = tidy_type($ctype);

Moved from "ExtUtils::ParseXS".

Inherits some evil code from "ExtUtils::ParseXS".

The parser is heavily inspired from the one in ExtUtils::ParseXS.

For details on typemaps: perlxstut, perlxs.

Steffen Mueller "<smueller@cpan.org">

Copyright 2009, 2010, 2011, 2012, 2013 Steffen Mueller

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

2021-05-23 perl v5.34.0