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++---------------------+
+| layout: page        |
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+| title: User Guide   |
++---------------------+
+
+llvm-py provides Python bindings for LLVM. This document explains how
+you can setup and use it. A working knowledge of Python and a basic idea
+of LLVM is assumed.
+
+Introduction
+============
+
+`LLVM <http://www.llvm.org/>`_ (Low-Level Virtual Machine) provides
+enough infrastructure to use it as the backend for your compiled, or
+JIT-compiled language. It provides extensive optimization support, and
+static and dynamic (JIT) backends for many platforms. See the website at
+http://www.llvm.org/ to discover more.
+
+Python bindings for LLVM provides a gentler learning curve for working
+with the LLVM APIs. It should also be easier to create working
+prototypes and experimental languages using this medium.
+
+Together with `clang <http://clang.llvm.org/>`_ or
+`llvm-gcc <http://llvm.org/cmds/llvmgcc.html>`_ it also a provides a
+means to quickly instrument C and C++ sources. For e.g., llvm-gcc can be
+used to generate the LLVM assembly for a given C source file, which can
+then be loaded and manipulated (adding profiling code to every function,
+say) using a llvm-py based Python script.
+
+License
+-------
+
+Both LLVM and llvm-py are distributed under (different) permissive open
+source licenses. llvm-py uses the `new BSD
+license <http://opensource.org/licenses/bsd-license.php>`_. More
+information is available
+`here <https://github.com/numba/llvm-py/blob/master/LICENSE>`_.
+
+Platforms
+---------
+
+llvm-py has been built/tested/reported to work on various GNU/Linux
+flavours, BSD, Mac OS X; on i386 and amd64 architectures. Windows is not
+supported, for a variety of reasons.
+
+Versions
+--------
+
+llvm-py 0.8.2 requires version 3.1 of LLVM. It may not work with
+previous versions.
+
+llvm-py has been built and tested with Python 2.7. It should work with
+earlier versions. It has not been tried with Python 3.x (patches
+welcome).
+
+--------------
+
+Installation
+============
+
+The Git repo of llvm-py is at https://github.com/numba/llvm-py.git.
+You'll need to build and install it before it can be used. At least the
+following will be required for this:
+
+-  C and C++ compilers (gcc/g++)
+-  Python itself
+-  Python development files (headers and libraries)
+-  LLVM, either installed or built
+
+On debian-based systems, the first three can be installed with the
+command ``sudo apt-get install gcc g++ python python-dev``. Ensure that
+your distro's repository has the appropriate version of LLVM!
+
+It does not matter which compiler LLVM itself was built with (``g++``,
+``llvm-g++`` or any other); llvm-py can be built with any compiler. It
+has been tried only with gcc/g++ though.
+
+LLVM and ``--enable-pic``
+-------------------------
+
+The result of an LLVM build is a set of static libraries and object
+files. The llvm-py contains an extension package that is built into a
+shared object (\_core.so) which links to these static libraries and
+object files. It is therefore required that the LLVM libraries and
+object files be built with the ``-fPIC`` option (generate position
+independent code). Be sure to use the ``--enable-pic`` option while
+configuring LLVM (default is no PIC), like this:
+
+{% highlight bash %} ~/llvm$ ./configure --enable-pic --enable-optimized
+{% endhighlight %}
+
+llvm-config
+-----------
+
+In order to build llvm-py, it's build script needs to know from where it
+can invoke the llvm helper program, ``llvm-config``. If you've installed
+LLVM, then this will be available in your ``PATH``, and nothing further
+needs to be done. If you've built LLVM yourself, or for any reason
+``llvm-config`` is not in your ``PATH``, you'll need to pass the full
+path of ``llvm-config`` to the build script.
+
+You'll need to be 'root' to install llvm-py. Remember that your ``PATH``
+is different from that of 'root', so even if ``llvm-config`` is in your
+``PATH``, it may not be available when you do ``sudo``.
+
+Steps
+-----
+
+Get 3.1 version of LLVM, build it. Make sure '--enable-pic' is passed to
+LLVM's 'configure'.
+
+Get llvm-py and install it:
+
+{% highlight bash %} $ git clone git@github.com:numba/llvm-py.git $ cd
+llvm-py $ python setup.py install {% endhighlight %}
+
+If you need to tell the build script where ``llvm-config`` is, do it
+this way:
+
+{% highlight bash %} $ python setup.py install --user
+--llvm-config=/home/mdevan/llvm/Release/bin/llvm-config {% endhighlight
+%}
+
+To build a debug version of llvm-py, that links against the debug
+libraries of LLVM, use this:
+
+{% highlight bash %} $ python setup.py build -g
+--llvm-config=/home/mdevan/llvm/Debug/bin/llvm-config $ python setup.py
+install --user --llvm-config=/home/mdevan/llvm/Debug/bin/llvm-config {%
+endhighlight %}
+
+Be warned that debug binaries will be huge (100MB+) ! They are required
+only if you need to debug into LLVM also.
+
+``setup.py`` is a standard Python distutils script. See the Python
+documentation regarding `Installing Python
+Modules <http://docs.python.org/inst/inst.html>`_ and `Distributing
+Python Modules <http://docs.python.org/dist/dist.html>`_ for more
+information on such scripts.
+
+--------------
+
+Uninstall # {#uninstall}
+========================
+
+If you'd installed llvm-py with the ``--user`` option, then llvm-py
+would be present under ``~/.local/lib/python2.7/site-packages``.
+Otherwise, it might be under ``/usr/lib/python2.7/site-packages`` or
+``/usr/local/lib/python2.7/site-packages``. The directory would vary
+with your Python version and OS flavour. Look around.
+
+Once you've located the site-packages directory, the modules and the
+"egg" can be removed like so:
+
+{% highlight bash %} $ rm -rf /llvm /llvm\_py-.egg-info {% endhighlight
+%}
+
+See the `Python
+documentation <http://docs.python.org/install/index.html>`_ for more
+information.
+
+--------------
+
+**Next** -- :doc:`llvm_concepts`