Compilation of an extended lambda-calculus to minimal stack style virtual machine.
Things to be done in order to a have a complete POC:
- Function application (not partial one)
- Sum data covering Inl, Inr and Case
- Product data covering Pair, First and Second
- Code Optimisation
- Recursive function
- Partial evaluation
pure source
>>= transpile
<&> expand
>>= optimise
<&> simplify
<&> normalise
The transpilation takes a lambda-calculus with recursion, sum and product data and produces the corresponding Michelson code.
Expansion is a de-normalisation operation building a source code based on a tree from a one which is a DAG.
For instance, a code like:
IF_LEFT A B ; C
becomes
IF_LEFT { A ; C } { B ; C }
This stage provides an optimised version of the initial Michelson source code. This optimisation is done thanks to a symbolic evaluation.
For instance, a code like:
LEFT; IF_LEFT B C
becomes
B
The simplification is the process which detects patterns and apply rewriting rules.
For instance, a code like:
SWAP; SWAP; C
becomes
C
This last stages revert the expansion process turning a tree based source code to a DAG in order to reduce the size of the source code finally.
For instance, a code like:
IF_LEFT { A ; C } { B ; C }
becomes
IF_LEFT A B ; C
Note: types are not given in the Michelson sample (for the moment).
(fun x -> case (inl x) (fun x -> x) (fun _ -> 3))is transpiled to
LAMBDA { DUP 0; LEFT; IF_LEFT { DUP 0; DROP 1 } { PUSH (INT 3); DROP 1 }; DROP 1 }
optimised to
LAMBDA { DUP 0; DROP 1 }
and finally simplified to
LAMBDA { }
(fun p -> (snd p) (fst p))is transpiled to
LAMBDA { DUP 0; CDR; DUP 1; CAR; EXEC; DROP 1 }
and finally simplified to
LAMBDA { UNPAIR; EXEC }
rec(f).(fun x -> f x)is transpiled to
LAMBDA_REC { DUP 1; DUP 1; EXEC; DROP 1; DROP 1 }
then simplified to
LAMBDA_REC { EXEC }
Note: This is a tail recursive function - which never terminates of course!
MIT License
Copyright (c) 2023-2024 Didier Plaindoux
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.