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|
module C = Collections
module T = Types
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_binder ctx p.var_id in
{ bv; projection = p.projection }
let mk_opt_mplace (p : E.place option) (ctx : Contexts.eval_ctx) : mplace option
=
match p with None -> None | Some p -> Some (mk_mplace p ctx)
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)
(exprl : expression list option) : expression option =
match exprl with
| None -> None
| Some exprl ->
let ls = List.combine seel exprl 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.SeConcrete (V.Bool true)), true_exp);
(Some (V.SeConcrete (V.Bool false)), false_exp);
] ->
ExpandBool (true_exp, false_exp)
| _ -> failwith "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.SeConcrete (V.Scalar cv)) ->
assert (cv.V.int_ty = int_ty);
cv
| _ -> failwith "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)
| _ -> failwith "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)
| _ -> failwith "Ill-formed borrow expansion")
| T.TypeVar _ | Char | Never | Str | Array _ | Slice _ ->
failwith "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)
(expr : expression option) : expression option =
let exprl = match expr with None -> None | Some expr -> Some [ expr ] in
synthesize_symbolic_expansion sv place [ Some see ] exprl
let synthesize_function_call (call_id : call_id)
(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)
(expr : expression option) : expression option =
match expr with
| None -> None
| Some expr ->
let call =
{
call_id;
abstractions;
type_params;
args;
dest;
args_places;
dest_place;
}
in
Some (FunCall (call, expr))
let synthesize_regular_function_call (fun_id : A.fun_id)
(call_id : V.FunCallId.id) (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) (expr : expression option) : expression option
=
synthesize_function_call
(Fun (fun_id, call_id))
abstractions type_params args args_places dest dest_place expr
let synthesize_unary_op (unop : E.unop) (arg : V.typed_value)
(arg_place : mplace option) (dest : V.symbolic_value)
(dest_place : mplace option) (expr : expression option) : expression option
=
synthesize_function_call (Unop unop) [] [] [ arg ] [ arg_place ] dest
dest_place expr
let synthesize_binary_op (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) (expr : expression option) : expression option
=
synthesize_function_call (Binop binop) [] [] [ arg0; arg1 ]
[ arg0_place; arg1_place ] dest dest_place expr
let synthesize_end_abstraction (abs : V.abs) (expr : expression option) :
expression option =
match expr with
| None -> None
| Some expr -> Some (EndAbstraction (abs, expr))
let synthesize_assignment (lplace : mplace) (rvalue : V.typed_value)
(rplace : mplace option) (expr : expression option) : expression option =
match expr with
| None -> None
| Some expr -> Some (Meta (Assignment (lplace, rvalue, rplace), expr))
|
