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Jakob Stoklund Olesen 8a55ed59de Implement separate data flow graph module.

The DFG keeps track of instruction definitions, values, and EBBs.

Store the primary definition of each instruction: Opcode and operands.
Track SSA values as either the result of an instruction or EBB arguments.

2016-07-19 12:51:34 -07:00

cranelift

Implement separate data flow graph module.

2016-07-19 12:51:34 -07:00

README.rst

=======================
Cretonne Code Generator
=======================

Cretonne is a low-level retargetable code generator. It translates a
target-independent intermediate language into executable machine code.

.. image:: https://readthedocs.org/projects/cretonne/badge/?version=latest
    :target: https://cretonne.readthedocs.io/en/latest/?badge=latest
    :alt: Documentation Status

.. image:: https://travis-ci.org/stoklund/cretonne.svg?branch=master
    :target: https://travis-ci.org/stoklund/cretonne
    :alt: Build Status

Cretonne is designed to be a code generator for WebAssembly with these design
goals:

No undefined behavior
    Cretonne does not have a nasal demons clause, and it won't generate code
    with unexpected behavior if invariants are broken.
Portable semantics
    As far as possible, Cretonne's input language has well-defined semantics
    that are the same on all target architectures. The semantics are usually
    the same as WebAssembly's.
Fast sandbox verification
    Cretonne's input language has a safe subset for sandboxed code. No advanced
    analysis is required to verify memory safety as long as only the safe
    instructions are used. The safe instruction set is expressive enough to
    implement WebAssembly.
Scalable performance
    Cretonne can be configured to generate code as quickly as possible, or it
    can generate very good code at the cost of slower compile times.
Predictable performance
    When optimizing, Cretonne focuses on adapting the target-independent IL to
    the quirks of the target architecture. There are no advanced optimizations
    that sometimes work, somtimes fail.

Building the documentation
--------------------------

To build the Cretonne documentation, you need the `Sphinx documentation
generator <http://www.sphinx-doc.org/>`_::

    $ pip install sphinx==1.3.5 sphinx-autobuild
    $ cd cretonne/docs
    $ make html
    $ open _build/html/index.html

The specific Sphinx version is currently used by Read the Docs. Sphinx 1.4 has
been released, but produces lots of warnings about four-column indices. We'll
upgrade when Read the Docs does.