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|
open Utils
open TypesUtils
open Types
open Values
module TA = TypesAnalysis
(** Utility exception *)
exception FoundSymbolicValue of symbolic_value
let mk_unit_value : typed_value =
{ value = Adt { variant_id = None; field_values = [] }; ty = mk_unit_ty }
let mk_typed_value (ty : ety) (value : value) : typed_value = { value; ty }
let mk_bottom (ty : ety) : typed_value = { value = Bottom; ty }
(** Box a value *)
let mk_box_value (v : typed_value) : typed_value =
let box_ty = mk_box_ty v.ty in
let box_v = Adt { variant_id = None; field_values = [ v ] } in
mk_typed_value box_ty box_v
let is_bottom (v : value) : bool = match v with Bottom -> true | _ -> false
let is_symbolic (v : value) : bool =
match v with Symbolic _ -> true | _ -> false
let as_symbolic (v : value) : symbolic_value =
match v with Symbolic s -> s | _ -> raise (Failure "Unexpected")
let as_mut_borrow (v : typed_value) : BorrowId.id * typed_value =
match v.value with
| Borrow (MutBorrow (bid, bv)) -> (bid, bv)
| _ -> raise (Failure "Unexpected")
(** Check if a value contains a borrow *)
let borrows_in_value (v : typed_value) : bool =
let obj =
object
inherit [_] iter_typed_value
method! visit_borrow_content _env _ = raise Found
end
in
(* We use exceptions *)
try
obj#visit_typed_value () v;
false
with Found -> true
(** Check if a value contains reserved mutable borrows *)
let reserved_in_value (v : typed_value) : bool =
let obj =
object
inherit [_] iter_typed_value
method! visit_ReservedMutBorrow _env _ = raise Found
end
in
(* We use exceptions *)
try
obj#visit_typed_value () v;
false
with Found -> true
(** Check if a value contains a loan *)
let loans_in_value (v : typed_value) : bool =
let obj =
object
inherit [_] iter_typed_value
method! visit_loan_content _env _ = raise Found
end
in
(* We use exceptions *)
try
obj#visit_typed_value () v;
false
with Found -> true
(** Check if a value contains outer loans (i.e., loans which are not in borrwed
values. *)
let outer_loans_in_value (v : typed_value) : bool =
let obj =
object
inherit [_] iter_typed_value
method! visit_loan_content _env _ = raise Found
method! visit_borrow_content _ _ = ()
end
in
(* We use exceptions *)
try
obj#visit_typed_value () v;
false
with Found -> true
let find_first_primitively_copyable_sv_with_borrows (type_infos : TA.type_infos)
(v : typed_value) : symbolic_value option =
(* The visitor *)
let obj =
object
inherit [_] iter_typed_value
method! visit_Symbolic _ sv =
let ty = sv.sv_ty in
if ty_is_primitively_copyable ty && ty_has_borrows type_infos ty then
raise (FoundSymbolicValue sv)
else ()
end
in
(* Small helper *)
try
obj#visit_typed_value () v;
None
with FoundSymbolicValue sv -> Some sv
(** Strip the outer shared loans in a value.
Ex.:
[shared_loan {l0, l1} (3 : u32, shared_loan {l2} (4 : u32))] ~~>
[(3 : u32, shared_loan {l2} (4 : u32))]
*)
let rec value_strip_shared_loans (v : typed_value) : typed_value =
match v.value with
| Loan (SharedLoan (_, v')) -> value_strip_shared_loans v'
| _ -> v
|
