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|
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 mk_meta (m : meta) (e : expression) : expression = Meta (m, e)
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.TLiteral PV.TBool -> (
(* Boolean expansion: there should be two branches *)
match ls with
| [
(Some (V.SeLiteral (PV.VBool true)), true_exp);
(Some (V.SeLiteral (PV.VBool false)), false_exp);
] ->
ExpandBool (true_exp, false_exp)
| _ -> raise (Failure "Ill-formed boolean expansion"))
| T.TLiteral (PV.TInteger 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.SeLiteral (PV.VScalar 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.TAdt (_, _) ->
(* 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.TRef (_, _, _) -> (
(* Reference expansion: there should be one branch *)
match ls with
| [ (Some see, exp) ] -> ExpandNoBranch (see, exp)
| _ -> raise (Failure "Ill-formed borrow expansion"))
| T.TVar _
| T.TLiteral TChar
| TNever | T.TTraitType _ | T.TArrow _ | T.TRawPtr _ ->
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) (generics : T.generic_args)
(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;
generics;
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_or_trait_method_ref)
(call_id : V.FunCallId.id) (ctx : Contexts.eval_ctx)
(abstractions : V.AbstractionId.id list) (generics : T.generic_args)
(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 generics 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 =
let generics = TypesUtils.mk_empty_generic_args in
synthesize_function_call (Unop unop) ctx [] generics [ 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 =
let generics = TypesUtils.mk_empty_generic_args in
synthesize_function_call (Binop binop) ctx [] generics [ 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)
(rg_to_given_back_tys :
(T.RegionId.Set.t * T.ty list) T.RegionGroupId.Map.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;
rg_to_given_back_tys;
end_expr;
loop_expr;
})
| _ -> raise (Failure "Unreachable")
|
