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Morte is a super-optimizing intermediate language for functional languages.
morte centers around a single idea: a strongly normalizing, typed, and
polymorphic lambda calculus is the ideal language for super-optimization of
programs. Optimization is just normalization of lambda terms. All abstractions
desugar to lambda abstraction.
- Install the
stack install morte
This creates the
morte executable under
~/.local/bin/ on Unix-like systems). This executable reads Morte
stdin, type-checks them, outputs their type to
outputs the optimized program to
stdout. For example:
$ morte \(a : *) -> \(x : a) -> x <Enter> <Ctrl-D> ∀(a : *) → a → a λ(a : *) → λ(x : a) → x $ # There was nothing to optimize
To learn more, read the Morte tutorial.
You can also use a front-end. Current front ends are
with hopefully more to come.
How to contribute
Morte needs a front-end compiler to translate high-level abstractions to the calculus of constructions and a back-end compiler to translate Morte to an executable. I'm currently working on both of these, but if you would like to contribute then contact me or open an issue on the issue tracker to discuss this.
The main volatility in the API is in error reporting, specifically how to preserve better error messages for front-end compilers.
morte may eventually switch to using
attoparsec instead of
happy. When this happens it might affect the grammar in subtle and
morte may also eventually expand the grammar and introduce other syntactic
niceties, but I'm currently playing it safe and keeping the grammar small for
One feature I'd eventually like to implement is the use of free theorems to further simplify Morte code, but this is not urgent and definitely a lower priority than implementing front-end and back-end compilers. If implemented, this would be entirely backwards compatible.
../multi-ghc-travis/make_travis_yml.hs morte.cabal alex-3.1.4 happy-1.19.5 > .travis.yml
You need to put this in the
before_install section so that cabal can find alex and happy:
- export HAPPYVER=1.19.5 - export ALEXVER=3.1.4 - export PATH=/opt/ghc/$GHCVER/bin:/opt/cabal/$CABALVER/bin:/opt/happy/$HAPPYVER/bin:/opt/alex/$ALEXVER/bin:$PATH
License (BSD 3-clause)
Copyright (c) 2014 Gabriel Gonzalez All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.
Neither the name of Gabriel Gonzalez nor the names of other contributors may be used to endorse or promote products derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*Note that all licence references and agreements mentioned in the morte README section above are relevant to that project's source code only.