Inline::Pdlpp - Write PDL Subroutines inline with PDL::PP

CWInline::Pdlpp is a module that allows you to write PDL subroutines in the PDL::PP style. The big benefit compared to plain CWPDL::PP is that you can write these definitions inline in any old perl script (without the normal hassle of creating Makefiles, building, etc). Since version 0.30 the Inline module supports multiple programming languages and each language has its own support module. This document describes how to use Inline with PDL::PP (or rather, it will once these docs are complete CW;).

For more information on Inline in general, see Inline.

Some example scripts demonstrating CWInline::Pdlpp usage can be found in the Example/InlinePdlpp directory.

CWInline::Pdlpp is mostly a shameless rip-off of CWInline::C. Most Kudos goes to Brian I.

You never actually use CWInline::Pdlpp directly. It is just a support module for using CWInline.pm with CWPDL::PP. So the usage is always:

    use Inline Pdlpp => ...;

or

    bind Inline Pdlpp => ...;

Pending availability of full docs a few quick examples that illustrate typical usage.

   # example script inlpp.pl
   use PDL; # must be called before (!) 'use Inline Pdlpp' calls

   use Inline Pdlpp; # the actual code is in the __Pdlpp__ block below

   $a = sequence 10;
   print $a->inc,"\n";
   print $a->inc->dummy(1,10)->tcumul,"\n";

   __DATA__

   __Pdlpp__

   pp_def('inc',
          Pars => 'i();[o] o()',
          Code => '$o() = $i() + 1;',
         );

   pp_def('tcumul',
          Pars => 'in(n);[o] mul()',
          Code => '$mul() = 1;
                   loop(n) %{
                     $mul() *= $in();
                   %}',
   );
   # end example script

If you call this script it should generate output similar to this:

   prompt> perl inlpp.pl
   Inline running PDL::PP version 2.2...
   [1 2 3 4 5 6 7 8 9 10]
   [3628800 3628800 3628800 3628800 3628800 3628800 3628800 3628800 3628800 3628800]

Usage of CWInline::Pdlpp in general is similar to CWInline::C. In the absence of full docs for CWInline::Pdlpp you might want to compare Inline::C.

The script below is somewhat more complicated in that it uses code from an external library (here from Numerical Recipes). All the relevant information regarding include files, libraries and boot code is specified in a config call to CWInline. For more experienced Perl hackers it might be helpful to know that the format is similar to that used with ExtUtils::MakeMaker. The keywords are largely equivalent to those used with CWInline::C. Please see below for further details on the usage of CWINC, CWLIBS, CWAUTO_INCLUDE and CWBOOT.

   use PDL; # this must be called before (!) 'use Inline Pdlpp' calls

   use Inline Pdlpp => Config =>
     INC => "-I$ENV{HOME}/include",
     LIBS => "-L$ENV{HOME}/lib -lnr -lm",
     # code to be included in the generated XS
     AUTO_INCLUDE => <<'EOINC',
   #include <math.h>
   #include "nr.h"    /* for poidev */
   #include "nrutil.h"  /* for err_handler */

   static void nr_barf(char *err_txt)
   {
     fprintf(stderr,"Now calling croak...\n");
     croak("NR runtime error: %s",err_txt);
   }
   EOINC
   # install our error handler when loading the Inline::Pdlpp code
   BOOT => 'set_nr_err_handler(nr_barf);';

   use Inline Pdlpp; # the actual code is in the __Pdlpp__ block below

   $a = zeroes(1) + 30;;
   print $a->poidev(5),"\n";

   __DATA__

   __Pdlpp__

   pp_def('poidev',
           Pars => 'xm(); [o] pd()',
           GenericTypes => [L,F,D],
           OtherPars => 'long idum',
           Code => '$pd() = poidev((float) $xm(), &$COMP(idum));',
   );

For information on how to specify Inline configuration options, see Inline. This section describes each of the configuration options available for Pdlpp. Most of the options correspond either to MakeMaker or XS options of the same name. See ExtUtils::MakeMaker and perlxs.

Specifies extra statements to automatically included. They will be added onto the defaults. A newline char will be automatically added. Does essentially the same as a call to CWpp_addhdr. For short bits of code CWAUTO_INCLUDE is probably syntactically nicer.

    use Inline Pdlpp => Config => AUTO_INCLUDE => '#include "yourheader.h"';

Same as CWpp_bless command. Specifies the package (i.e. class) to which your new pp_defed methods will be added. Defaults to CWPDL if omitted.

    use Inline Pdlpp => Config => BLESS => 'PDL::Complex';

Specifies C code to be executed in the XS BOOT section. Corresponds to the XS parameter. Does the same as the CWpp_add_boot command. Often used to execute code only once at load time of the module, e.g. a library initialization call.

Specify which compiler to use.

Specify extra compiler flags.

Specifies an include path to use. Corresponds to the MakeMaker parameter.

    use Inline Pdlpp => Config => INC => '-I/inc/path';

Specify which linker to use.

Specify which linker flags to use.

NOTE: These flags will completely override the existing flags, instead of just adding to them. So if you need to use those too, you must respecify them here.

Specifies external libraries that should be linked into your code. Corresponds to the MakeMaker parameter.

    use Inline Pdlpp => Config => LIBS => '-lyourlib';

or

    use Inline Pdlpp => Config => LIBS => '-L/your/path -lyourlib';

Specify the name of the 'make' utility to use.

Specifies a user compiled object that should be linked in. Corresponds to the MakeMaker parameter.

    use Inline Pdlpp => Config => MYEXTLIB => '/your/path/yourmodule.so';

This controls the MakeMaker OPTIMIZE setting. By setting this value to '-g', you can turn on debugging support for your Inline extensions. This will allow you to be able to set breakpoints in your C code using a debugger like gdb.

Specifies extra typemap files to use. Corresponds to the MakeMaker parameter.

    use Inline Pdlpp => Config => TYPEMAPS => '/your/path/typemap';

Show the output of any compilations going on behind the scenes. Uses CWtee which must be available on your computer. Default is off.

Beware that there is a problem when you use the __DATA__ keyword style of Inline definition and want to CWdo your script containing inlined code. For example

   # myscript.pl contains inlined code
   # in the __DATA__ section
   perl -e 'do "myscript.pl";'
 One or more DATA sections were not processed by Inline.

According to Brian Ingerson (of Inline fame) the workaround is to include an CWInline->init call in your script, e.g.

  use PDL;
  use Inline Pdlpp;
  Inline->init;

  # perl code

  __DATA__
  __Pdlpp__

  # pp code

  use PDL::NiceSlice;
  use Inline::Pdlpp;

  $a = sequence 10;
  $a(0:3)++;
  $a->inc;

  no PDL::NiceSlice;

  __DATA__

  __C__

  ppdef (...); # your full pp definition here

Brian Ingerson for creating the Inline infrastructure.

Christian Soeller <soellermail@excite.com>

PDL

PDL::PP

Inline

Inline::C

Copyright (c) 2001. Christian Soeller. All rights reserved.

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

See http://pdl.perl.org