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authorSon Ho2021-12-08 15:24:47 +0100
committerSon Ho2021-12-08 15:24:47 +0100
commit8e6308dc4017d2a2a0f9b48edcac4d0f40d8e1a9 (patch)
tree40f1dfdf24c5a97e1ec6b358265cbd6b007b5bf2 /src
parent458c1b759ce887f34d1831d5974d6c75b4f4137e (diff)
Revert the implementation of copy_value
Diffstat (limited to '')
-rw-r--r--src/Interpreter.ml129
1 files changed, 39 insertions, 90 deletions
diff --git a/src/Interpreter.ml b/src/Interpreter.ml
index 24b10fff..1af050c9 100644
--- a/src/Interpreter.ml
+++ b/src/Interpreter.ml
@@ -1542,96 +1542,45 @@ let rec drop_borrows_loans_at_lplace (config : C.config) (p : E.place)
*)
let rec copy_value (config : C.config) (ctx : C.eval_ctx) (v : V.typed_value) :
C.eval_ctx * V.typed_value =
- (* Check that there are no inactivated/mutable borrows/loans in the value *)
- assert (not (mut_inactivated_borrows_loans_in_value v));
- (* No bottom *)
- assert (not (bottom_in_value v));
-
- (* We may need to update the context (to duplicated shared borrows) *)
- let ctx_r = ref ctx in
-
- let obj =
- object
- inherit [_] V.map_typed_value as super
-
- method! visit_Bottom _ = failwith "Can't copy ⊥"
-
- method! visit_ety env ty =
- (* Sanity check: *)
- (match ty with
- | T.Adt (T.Assumed _, _, _) -> failwith "Can't copy an assumed value"
- | _ -> () (* Ok *));
- (* Ok: continue *)
- super#visit_ety env ty
-
- method! visit_borrow_content env bc =
- (* We can only copy shared borrows *)
- match bc with
- | SharedBorrow bid ->
- (* We need to create a new borrow id for the copied borrow, and
- * update the context accordingly *)
- let ctx, bid' = C.fresh_borrow_id !ctx_r in
- let ctx = reborrow_shared config bid bid' ctx in
- ctx_r := ctx;
- SharedBorrow bid'
- | MutBorrow (_, _) -> failwith "Can't copy a mutable borrow"
- | V.InactivatedMutBorrow _ ->
- failwith "Can't copy an inactivated mut borrow"
-
- method! visit_Loan env lc =
- (* We can only copy shared loans *)
- match lc with
- | V.MutLoan _ -> failwith "Can't copy a mutable loan"
- | V.SharedLoan (_, sv) ->
- (* We don't copy the shared loan: only the shared value inside *)
- let v : V.typed_value = super#visit_typed_value env sv in
- v.V.value
-
- method! visit_Symbolic _ _ =
- (* TODO: check that the value is copyable *)
- raise Unimplemented
- end
- in
-
- (* Copy and update the context at the same time *)
- let copied = obj#visit_typed_value () v in
- (!ctx_r, copied)
-
-(* match v.V.value with
- | V.Concrete _ -> (ctx, v)
- | V.Adt av ->
- (* Sanity check *)
- (match v.V.ty with
- | T.Adt (T.Assumed _, _, _) -> failwith "Can't copy an assumed value"
- | T.Adt ((T.AdtId _ | T.Tuple), _, _) -> () (* Ok *)
- | _ -> failwith "Unreachable");
- let ctx, fields =
- List.fold_left_map (copy_value config) ctx av.field_values
- in
- (ctx, { v with V.value = V.Adt { av with field_values = fields } })
- | V.Bottom -> failwith "Can't copy ⊥"
- | V.Borrow bc -> (
- (* We can only copy shared borrows *)
- match bc with
- | SharedBorrow bid ->
- (* We need to create a new borrow id for the copied borrow, and
- * update the context accordingly *)
- let ctx, bid' = C.fresh_borrow_id ctx in
- let ctx = reborrow_shared config bid bid' ctx in
- (ctx, { v with V.value = V.Borrow (SharedBorrow bid') })
- | MutBorrow (_, _) -> failwith "Can't copy a mutable borrow"
- | V.InactivatedMutBorrow _ ->
- failwith "Can't copy an inactivated mut borrow")
- | V.Loan lc -> (
- (* We can only copy shared loans *)
- match lc with
- | V.MutLoan _ -> failwith "Can't copy a mutable loan"
- | V.SharedLoan (_, sv) ->
- (* We don't copy the shared loan: only the shared value inside *)
- copy_value config ctx sv)
- | V.Symbolic _sp ->
- (* TODO: check that the value is copyable *)
- raise Unimplemented*)
+ (* Remark: at some point we rewrote this function to use iterators, but then
+ * we reverted the changes: the result was less clear actually. In particular,
+ * the fact that we have exhaustive matches below makes very obvious the cases
+ * in which we need to fail *)
+ match v.V.value with
+ | V.Concrete _ -> (ctx, v)
+ | V.Adt av ->
+ (* Sanity check *)
+ (match v.V.ty with
+ | T.Adt (T.Assumed _, _, _) -> failwith "Can't copy an assumed value"
+ | T.Adt ((T.AdtId _ | T.Tuple), _, _) -> () (* Ok *)
+ | _ -> failwith "Unreachable");
+ let ctx, fields =
+ List.fold_left_map (copy_value config) ctx av.field_values
+ in
+ (ctx, { v with V.value = V.Adt { av with field_values = fields } })
+ | V.Bottom -> failwith "Can't copy ⊥"
+ | V.Borrow bc -> (
+ (* We can only copy shared borrows *)
+ match bc with
+ | SharedBorrow bid ->
+ (* We need to create a new borrow id for the copied borrow, and
+ * update the context accordingly *)
+ let ctx, bid' = C.fresh_borrow_id ctx in
+ let ctx = reborrow_shared config bid bid' ctx in
+ (ctx, { v with V.value = V.Borrow (SharedBorrow bid') })
+ | MutBorrow (_, _) -> failwith "Can't copy a mutable borrow"
+ | V.InactivatedMutBorrow _ ->
+ failwith "Can't copy an inactivated mut borrow")
+ | V.Loan lc -> (
+ (* We can only copy shared loans *)
+ match lc with
+ | V.MutLoan _ -> failwith "Can't copy a mutable loan"
+ | V.SharedLoan (_, sv) ->
+ (* We don't copy the shared loan: only the shared value inside *)
+ copy_value config ctx sv)
+ | V.Symbolic _sp ->
+ (* TODO: check that the value is copyable *)
+ raise Unimplemented
(** Convert a constant operand value to a typed value *)
let constant_value_to_typed_value (ctx : C.eval_ctx) (ty : T.ety)