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Prolog on Parrot
Perl Parrot
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=head1 Parrotlog

This is Parrotlog, a Prolog compiler for the Parrot virtual machine.

=head2 Build requirements (installing from source)

For building Parrotlog you need at least a C compiler, a C<make> utility,
and Perl 5.8 or newer.  To automatically obtain and build Parrot
you may also need a subversion (svn) client.

=head2 Building and invoking Parrotlog

We generally recommend downloading Parrotlog directly from

Once you have a copy of Parrotlog, build it as follows:

    $ cd parrotlog
    $ perl --gen-parrot
    $ make

This will create a "parrotlog" or "parrotlog.exe" executable in the
current directory.  Programs can then be run from the build
directory using a command like:

    $ ./parrotlog <source>

The C<--gen-parrot> option above tells to automatically
download and build the most appropriate version of Parrot into
a local "parrot/" subdirectory, install that Parrot into
the "parrot_install/" subdirectory, and use that for building
Parrotlog.  It's okay to use the C<--gen-parrot> option on later
invocations of; the configure system will re-build
Parrot only if a newer version is needed for whatever version
of Parrotlog you're working with.

You can use C<--parrot-config=/path/to/parrot_config> instead
of C<--gen-parrot> to use an already installed Parrot for building
Parrotlog.  This installed Parrot must include its development
environment; typically this is done via Parrot's C<make install>
target or by installing prebuilt C<parrot-devel> and/or C<libparrot-dev>
packages.  The version of the already installed Parrot must satisfy a
minimum specified by Parrotlog -- will verify this for you.

Once built, Parrotlog's C<make install> target will install Parrotlog
and its libraries into the Parrot installation that was used to
create it.  Until this step is performed, the "parrotlog" executable
created by C<make> above can only be reliably run from the root of
Parrotlog's build directory.  After C<make install> is performed,
the installed executable can be run from any directory (as long as
the Parrot installation that was used to create it remains intact).

If the Parrotlog compiler is invoked without an explicit script to
run, it enters a small interactive mode that allows statements
to be executed from the command line.  Each line entered is treated
as a separate compilation unit, however (which means that subroutines
are preserved after they are defined, but variables are not).

=head2 Running the test suite

Entering C<make test> will run a test suite that comes bundled
with Parrotlog.  This is a simple suite of tests, designed to make sure
that the compiler is basically working and that it's capable of
running a simple test harness.

If you want to run the tests in parallel, you need to install a
fairly recent version of the Perl 5 module L<Test::Harness> (3.16
works for sure).

=head2 Where to get help or answers to questions

=head2 Reporting bugs

=head2 Submitting patches

=head2 How the compiler works

There is no documentation yet, but there is a development diary at

=head1 AUTHOR

Arne SkjE<aelig>rholt (L<>). I can also be found in #perl6
on Freenode and #parrot on, I'm usually available roughly
between noon and midnight, central european time.


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