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|
(** This file implements various substitution utilities to instantiate types,
function bodies, etc.
*)
include Charon.Substitute
open Types
open Values
open LlbcAst
open Contexts
open Errors
(** Generate fresh regions for region variables.
Return the list of new regions and appropriate substitutions from the
original region variables to the fresh regions.
TODO: simplify? we only need the subst [RegionVarId.id -> RegionId.id]
*)
let fresh_regions_with_substs ~(fail_if_not_found : bool)
(region_vars : RegionVarId.id list) :
RegionId.id list
* (RegionVarId.id -> RegionId.id option)
* (region -> region) =
(* Generate fresh regions *)
let fresh_region_ids = List.map (fun _ -> fresh_region_id ()) region_vars in
(* Generate the map from region var ids to regions *)
let ls = List.combine region_vars fresh_region_ids in
let rid_map = RegionVarId.Map.of_list ls in
(* Generate the substitution from region var id to region *)
let rid_subst id = RegionVarId.Map.find_opt id rid_map in
(* Generate the substitution from region to region *)
let r_subst (r : region) =
match r with
| RStatic | RErased | RFVar _ -> r
| RBVar (bdid, id) ->
if bdid = 0 then
match rid_subst id with
| None -> if fail_if_not_found then raise Not_found else r
| Some r -> RFVar r
else r
in
(* Return *)
(fresh_region_ids, rid_subst, r_subst)
let fresh_regions_with_substs_from_vars ~(fail_if_not_found : bool)
(region_vars : region_var list) :
RegionId.id list
* (RegionVarId.id -> RegionId.id option)
* (region -> region) =
fresh_regions_with_substs ~fail_if_not_found
(List.map (fun (r : region_var) -> r.index) region_vars)
(** Return the types of the properly instantiated ADT's variant, provided a
context.
**IMPORTANT**: this function doesn't normalize the types, you may want to
use the [AssociatedTypes] equivalent instead.
*)
let ctx_adt_get_instantiated_field_types (ctx : eval_ctx)
(def_id : TypeDeclId.id) (opt_variant_id : VariantId.id option)
(generics : generic_args) : ty list =
let def = ctx_lookup_type_decl ctx def_id in
type_decl_get_instantiated_field_types def opt_variant_id generics
(** Return the types of the properly instantiated ADT value (note that
here, ADT is understood in its broad meaning: ADT, assumed value or tuple).
**IMPORTANT**: this function doesn't normalize the types, you may want to
use the [AssociatedTypes] equivalent instead.
*)
let ctx_adt_value_get_instantiated_field_types (span : Meta.span)
(ctx : eval_ctx) (adt : adt_value) (id : type_id) (generics : generic_args)
: ty list =
match id with
| TAdtId id ->
(* Retrieve the types of the fields *)
ctx_adt_get_instantiated_field_types ctx id adt.variant_id generics
| TTuple ->
cassert __FILE__ __LINE__ (generics.regions = []) span
"Tuples don't have region parameters";
generics.types
| TAssumed aty -> (
match aty with
| TBox ->
sanity_check __FILE__ __LINE__ (generics.regions = []) span;
sanity_check __FILE__ __LINE__ (List.length generics.types = 1) span;
sanity_check __FILE__ __LINE__ (generics.const_generics = []) span;
generics.types
| TArray | TSlice | TStr ->
(* Those types don't have fields *)
craise __FILE__ __LINE__ span "Unreachable")
(** Substitute a function signature, together with the regions hierarchy
associated to that signature.
**IMPORTANT:** this function doesn't normalize the types.
*)
let substitute_signature (asubst : RegionGroupId.id -> AbstractionId.id)
(r_subst : RegionVarId.id -> RegionId.id) (ty_subst : TypeVarId.id -> ty)
(cg_subst : ConstGenericVarId.id -> const_generic)
(tr_subst : TraitClauseId.id -> trait_instance_id)
(tr_self : trait_instance_id) (sg : fun_sig)
(regions_hierarchy : region_var_groups) : inst_fun_sig =
let r_subst' (r : region) : region =
match r with
| RStatic | RErased | RFVar _ -> r
| RBVar (bdid, rid) -> if bdid = 0 then RFVar (r_subst rid) else r
in
let subst = { r_subst = r_subst'; ty_subst; cg_subst; tr_subst; tr_self } in
let inputs = List.map (ty_substitute subst) sg.inputs in
let output = ty_substitute subst sg.output in
let subst_region_group (rg : region_var_group) : abs_region_group =
let id = asubst rg.id in
let regions = List.map r_subst rg.regions in
let parents = List.map asubst rg.parents in
({ id; regions; parents } : abs_region_group)
in
let regions_hierarchy = List.map subst_region_group regions_hierarchy in
let trait_type_constraints =
List.map
(trait_type_constraint_substitute subst)
sg.generics.trait_type_constraints
in
{ inputs; output; regions_hierarchy; trait_type_constraints }
let subst_ids_visitor (r_subst : RegionId.id -> RegionId.id)
(ty_subst : TypeVarId.id -> TypeVarId.id)
(cg_subst : ConstGenericVarId.id -> ConstGenericVarId.id)
(ssubst : SymbolicValueId.id -> SymbolicValueId.id)
(bsubst : BorrowId.id -> BorrowId.id)
(asubst : AbstractionId.id -> AbstractionId.id) =
object (self : 'self)
inherit [_] map_env
method! visit_type_var_id _ id = ty_subst id
method! visit_const_generic_var_id _ id = cg_subst id
method! visit_region_id _ rid = r_subst rid
method! visit_borrow_id _ bid = bsubst bid
method! visit_loan_id _ bid = bsubst bid
method! visit_symbolic_value_id _ id = ssubst id
(** We *do* visit meta-values *)
method! visit_msymbolic_value env sv = self#visit_symbolic_value env sv
(** We *do* visit meta-values *)
method! visit_mvalue env v = self#visit_typed_value env v
method! visit_abstraction_id _ id = asubst id
end
let typed_value_subst_ids (span : Meta.span)
(r_subst : RegionId.id -> RegionId.id)
(ty_subst : TypeVarId.id -> TypeVarId.id)
(cg_subst : ConstGenericVarId.id -> ConstGenericVarId.id)
(ssubst : SymbolicValueId.id -> SymbolicValueId.id)
(bsubst : BorrowId.id -> BorrowId.id) (v : typed_value) : typed_value =
let asubst _ = craise __FILE__ __LINE__ span "Unreachable" in
let vis = subst_ids_visitor r_subst ty_subst cg_subst ssubst bsubst asubst in
vis#visit_typed_value () v
let typed_value_subst_rids (span : Meta.span)
(r_subst : RegionId.id -> RegionId.id) (v : typed_value) : typed_value =
typed_value_subst_ids span r_subst
(fun x -> x)
(fun x -> x)
(fun x -> x)
(fun x -> x)
v
let typed_avalue_subst_ids (span : Meta.span)
(r_subst : RegionId.id -> RegionId.id)
(ty_subst : TypeVarId.id -> TypeVarId.id)
(cg_subst : ConstGenericVarId.id -> ConstGenericVarId.id)
(ssubst : SymbolicValueId.id -> SymbolicValueId.id)
(bsubst : BorrowId.id -> BorrowId.id) (v : typed_avalue) : typed_avalue =
let asubst _ = craise __FILE__ __LINE__ span "Unreachable" in
let vis = subst_ids_visitor r_subst ty_subst cg_subst ssubst bsubst asubst in
vis#visit_typed_avalue () v
let abs_subst_ids (r_subst : RegionId.id -> RegionId.id)
(ty_subst : TypeVarId.id -> TypeVarId.id)
(cg_subst : ConstGenericVarId.id -> ConstGenericVarId.id)
(ssubst : SymbolicValueId.id -> SymbolicValueId.id)
(bsubst : BorrowId.id -> BorrowId.id)
(asubst : AbstractionId.id -> AbstractionId.id) (x : abs) : abs =
let vis = subst_ids_visitor r_subst ty_subst cg_subst ssubst bsubst asubst in
vis#visit_abs () x
let env_subst_ids (r_subst : RegionId.id -> RegionId.id)
(ty_subst : TypeVarId.id -> TypeVarId.id)
(cg_subst : ConstGenericVarId.id -> ConstGenericVarId.id)
(ssubst : SymbolicValueId.id -> SymbolicValueId.id)
(bsubst : BorrowId.id -> BorrowId.id)
(asubst : AbstractionId.id -> AbstractionId.id) (x : env) : env =
let vis = subst_ids_visitor r_subst ty_subst cg_subst ssubst bsubst asubst in
vis#visit_env () x
let typed_avalue_subst_rids (span : Meta.span)
(r_subst : RegionId.id -> RegionId.id) (x : typed_avalue) : typed_avalue =
let asubst _ = craise __FILE__ __LINE__ span "Unreachable" in
let vis =
subst_ids_visitor r_subst
(fun x -> x)
(fun x -> x)
(fun x -> x)
(fun x -> x)
asubst
in
vis#visit_typed_avalue () x
let env_subst_rids (r_subst : RegionId.id -> RegionId.id) (x : env) : env =
let vis =
subst_ids_visitor r_subst
(fun x -> x)
(fun x -> x)
(fun x -> x)
(fun x -> x)
(fun x -> x)
in
vis#visit_env () x
|
