ExtUtils::Typemaps(3pm) Perl Programmers Reference Guide
NAME
ExtUtils::Typemaps - Read/Write/Modify Perl/XS typemap files
SYNOPSIS
# 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);
DESCRIPTION
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.
METHODS
new
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.
file
Get/set the file that the typemap is written to when the "write" method
is called.
add_typemap
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_inputmap
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_outputmap
Add an "OUTPUT" entry to the typemap. Works exactly the same as
"add_inputmap".
add_string
Parses a string as a typemap and merge it into the typemap object.
Required named argument: "string" to specify the string to parse.
remove_typemap
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.
remove_inputmap
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.
remove_outputmap
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.
get_typemap
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.
get_inputmap
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.
get_outputmap
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
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).
as_string
Generates and returns the string form of the typemap.
as_embedded_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.
merge
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.
is_empty
Returns a bool indicating whether this typemap is entirely empty.
list_mapped_ctypes
Returns a list of the C types that are mappable by this typemap object.
_get_typemap_hash
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.
_get_inputmap_hash
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.
_get_outputmap_hash
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
$arg = &PL_sv_undef;
}
',
# ...
}
This is documented because it is used by "ExtUtils::ParseXS", but it's
not intended for general consumption. May be removed at any time.
_get_prototype_hash
Returns a hash mapping the C types of the typemap to their
corresponding prototypes.
{
'char **' => '$',
'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.
clone
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.
tidy_type
Function to (heuristically) canonicalize a C type. Works to some degree
with C++ types.
$halfway_canonical_type = tidy_type($ctype);
Moved from "ExtUtils::ParseXS".
CAVEATS
Inherits some evil code from "ExtUtils::ParseXS".
SEE ALSO
The parser is heavily inspired from the one in ExtUtils::ParseXS(3).
For details on typemaps: perlxstut(1), perlxs(1).
AUTHOR
Steffen Mueller "<smueller@cpan.org">
COPYRIGHT & LICENSE
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.
perl v5.38.2 2023-11-28 ExtUtils::Typemaps(3pm)
perl 5.38.2 - Generated Fri Dec 6 07:32:27 CST 2024