catala/compiler/dcalc/invariants.mli

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(* This file is part of the Catala compiler, a specification language for tax
and social benefits computation rules. Copyright (C) 2020 Inria, contributor:
Alain Delaët <alain.delaet--tixeuil@inria.fr>
Licensed under the Apache License, Version 2.0 (the "License"); you may not
use this file except in compliance with the License. You may obtain a copy of
the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
License for the specific language governing permissions and limitations under
the License. *)
(** This file makes explicit few structural invariants of the dcalc asbtract
syntax tree. Those invariants have been checked on all tests and examples of
catala. The behavior of the compiler on programs that don't follow those
invariant in undefined. *)
open Shared_ast
open Ast
val check_all_invariants : typed program -> bool
(** Check all invariants. Return true if all the invariants are correct. Print
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errors messages for each unsucessfull invariants. Here are all the
invariants checked:
- [invariant_default_no_arrow] check no default term has a function type.
- [invariant_no_partial_evaluation] check there is no partial function.
- [invariant_no_return_a_function] check no function return a function.
- [invariant_app_inversion] : if the term is an function application, then
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there is only 6 possibility : it is a let binding, it is an operator
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application, it is an variable application, it is a struct access function
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application (sub-scope call), it is a operator application with trace, or
an external function.
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- [invariant_match_inversion] : if a term is a match, then every branch is
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an function abstraction.
- [invariant_typing_default]: the type TDefault can only appear in some
positions.
The function prints as a side effect the different errors.*)