module C = Collections module T = Types module PV = PrimitiveValues module V = Values module E = Expressions module A = LlbcAst open SymbolicAst let mk_mplace (p : E.place) (ctx : Contexts.eval_ctx) : mplace = let bv = Contexts.ctx_lookup_var_binder ctx p.var_id in { bv; projection = p.projection } let mk_opt_mplace (p : E.place option) (ctx : Contexts.eval_ctx) : mplace option = Option.map (fun p -> mk_mplace p ctx) p let mk_opt_place_from_op (op : E.operand) (ctx : Contexts.eval_ctx) : mplace option = match op with | E.Copy p | E.Move p -> Some (mk_mplace p ctx) | E.Constant _ -> None let synthesize_symbolic_expansion (sv : V.symbolic_value) (place : mplace option) (seel : V.symbolic_expansion option list) (el : expression list option) : expression option = match el with | None -> None | Some el -> let ls = List.combine seel el in (* Match on the symbolic value type to know which can of expansion happened *) let expansion = match sv.V.sv_ty with | T.Bool -> ( (* Boolean expansion: there should be two branches *) match ls with | [ (Some (V.SePrimitive (PV.Bool true)), true_exp); (Some (V.SePrimitive (PV.Bool false)), false_exp); ] -> ExpandBool (true_exp, false_exp) | _ -> raise (Failure "Ill-formed boolean expansion")) | T.Integer int_ty -> (* Switch over an integer: split between the "regular" branches and the "otherwise" branch (which should be the last branch) *) let branches, otherwise = C.List.pop_last ls in (* For all the regular branches, the symbolic value should have * been expanded to a constant *) let get_scalar (see : V.symbolic_expansion option) : V.scalar_value = match see with | Some (V.SePrimitive (PV.Scalar cv)) -> assert (cv.PV.int_ty = int_ty); cv | _ -> raise (Failure "Unreachable") in let branches = List.map (fun (see, exp) -> (get_scalar see, exp)) branches in (* For the otherwise branch, the symbolic value should have been left * unchanged *) let otherwise_see, otherwise = otherwise in assert (otherwise_see = None); (* Return *) ExpandInt (int_ty, branches, otherwise) | T.Adt (_, _, _) -> (* Branching: it is necessarily an enumeration expansion *) let get_variant (see : V.symbolic_expansion option) : T.VariantId.id option * V.symbolic_value list = match see with | Some (V.SeAdt (vid, fields)) -> (vid, fields) | _ -> raise (Failure "Ill-formed branching ADT expansion") in let exp = List.map (fun (see, exp) -> let vid, fields = get_variant see in (vid, fields, exp)) ls in ExpandAdt exp | T.Ref (_, _, _) -> ( (* Reference expansion: there should be one branch *) match ls with | [ (Some see, exp) ] -> ExpandNoBranch (see, exp) | _ -> raise (Failure "Ill-formed borrow expansion")) | T.TypeVar _ | Char | Never | Str | Array _ | Slice _ -> raise (Failure "Ill-formed symbolic expansion") in Some (Expansion (place, sv, expansion)) let synthesize_symbolic_expansion_no_branching (sv : V.symbolic_value) (place : mplace option) (see : V.symbolic_expansion) (e : expression option) : expression option = let el = Option.map (fun e -> [ e ]) e in synthesize_symbolic_expansion sv place [ Some see ] el let synthesize_function_call (call_id : call_id) (ctx : Contexts.eval_ctx) (abstractions : V.AbstractionId.id list) (type_params : T.ety list) (args : V.typed_value list) (args_places : mplace option list) (dest : V.symbolic_value) (dest_place : mplace option) (e : expression option) : expression option = Option.map (fun e -> let call = { call_id; ctx; abstractions; type_params; args; dest; args_places; dest_place; } in FunCall (call, e)) e let synthesize_global_eval (gid : A.GlobalDeclId.id) (dest : V.symbolic_value) (e : expression option) : expression option = Option.map (fun e -> EvalGlobal (gid, dest, e)) e let synthesize_regular_function_call (fun_id : A.fun_id) (call_id : V.FunCallId.id) (ctx : Contexts.eval_ctx) (abstractions : V.AbstractionId.id list) (type_params : T.ety list) (args : V.typed_value list) (args_places : mplace option list) (dest : V.symbolic_value) (dest_place : mplace option) (e : expression option) : expression option = synthesize_function_call (Fun (fun_id, call_id)) ctx abstractions type_params args args_places dest dest_place e let synthesize_unary_op (ctx : Contexts.eval_ctx) (unop : E.unop) (arg : V.typed_value) (arg_place : mplace option) (dest : V.symbolic_value) (dest_place : mplace option) (e : expression option) : expression option = synthesize_function_call (Unop unop) ctx [] [] [ arg ] [ arg_place ] dest dest_place e let synthesize_binary_op (ctx : Contexts.eval_ctx) (binop : E.binop) (arg0 : V.typed_value) (arg0_place : mplace option) (arg1 : V.typed_value) (arg1_place : mplace option) (dest : V.symbolic_value) (dest_place : mplace option) (e : expression option) : expression option = synthesize_function_call (Binop binop) ctx [] [] [ arg0; arg1 ] [ arg0_place; arg1_place ] dest dest_place e let synthesize_end_abstraction (ctx : Contexts.eval_ctx) (abs : V.abs) (e : expression option) : expression option = Option.map (fun e -> EndAbstraction (ctx, abs, e)) e let synthesize_assignment (ctx : Contexts.eval_ctx) (lplace : mplace) (rvalue : V.typed_value) (rplace : mplace option) (e : expression option) : expression option = Option.map (fun e -> Meta (Assignment (ctx, lplace, rvalue, rplace), e)) e let synthesize_assertion (ctx : Contexts.eval_ctx) (v : V.typed_value) (e : expression option) = Option.map (fun e -> Assertion (ctx, v, e)) e let synthesize_forward_end (ctx : Contexts.eval_ctx) (loop_input_values : V.typed_value V.SymbolicValueId.Map.t option) (e : expression) (el : expression T.RegionGroupId.Map.t) = Some (ForwardEnd (ctx, loop_input_values, e, el)) let synthesize_loop (loop_id : V.LoopId.id) (input_svalues : V.symbolic_value list) (fresh_svalues : V.SymbolicValueId.Set.t) (end_expr : expression option) (loop_expr : expression option) : expression option = match (end_expr, loop_expr) with | None, None -> None | Some end_expr, Some loop_expr -> Some (Loop { loop_id; input_svalues; fresh_svalues; end_expr; loop_expr }) | _ -> raise (Failure "Unreachable")