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open Lustre_types
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type register_t =
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  | ResetFlag
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  | StateVar of var_decl
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type left_v
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type right_v
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type ('a, _) expression_t =
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  | Val: 'a -> ('a, right_v) expression_t
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  | Tag: ident -> ('a, right_v) expression_t
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  | Var: var_decl -> ('a, left_v) expression_t
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  | Memory: register_t -> ('a, left_v) expression_t
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(** TODO: why moving this elsewhere makes the exhaustiveness check fail? *)
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let type_of_l_value: type a. (a, left_v) expression_t -> Types.type_expr =
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  function
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  | Var v -> v.var_type
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  | Memory ResetFlag -> Type_predef.type_bool
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  | Memory (StateVar v) -> v.var_type
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type ('a, 'b) expressions_t = ('a, 'b) expression_t list
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type 'a predicate_t =
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  | Transition: ident * ident option * int option
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                * ('a, 'b) expressions_t
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                * ('a, 'b) expressions_t
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                * ('a, 'b) expressions_t -> 'a predicate_t
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  | MemoryPack of ident * ident option * int option
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  | Initialization
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  | ResetCleared of ident
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type 'a formula_t =
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  | True
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  | False
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  | Equal: ('a, left_v) expression_t * ('a, 'b) expression_t -> 'a formula_t
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  | And of 'a formula_t list
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  | Or of 'a formula_t list
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  | Imply of 'a formula_t * 'a formula_t
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  | Exists of var_decl list * 'a formula_t
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  | Forall of var_decl list * 'a formula_t
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  | Ternary: ('a, 'b) expression_t * 'a formula_t * 'a formula_t -> 'a formula_t
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  | Predicate: 'a predicate_t -> 'a formula_t
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  | StateVarPack of register_t
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  | ExistsMem of 'a formula_t * 'a formula_t
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(* type 'a simulation_t = {
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 *   sname: node_desc;
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 *   sindex: option int;
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 *   sformula: 'a formula_t;
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 * } *)
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type 'a memory_pack_t = {
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  mpname: node_desc;
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  mpindex: int option;
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  mpformula: 'a formula_t;
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}
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type 'a transition_t = {
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  tname: node_desc;
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  tindex: int option;
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  tinputs: var_decl list;
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  tlocals: var_decl list;
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  toutputs: var_decl list;
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  tformula: 'a formula_t;
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}
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