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|
open Types
open TypesUtils
open Expressions
open Values
open LlbcAst
open SymbolicAst
open Errors
let mk_mplace (span : Meta.span) (p : place) (ctx : Contexts.eval_ctx) : mplace
=
let bv = Contexts.ctx_lookup_var_binder span ctx p.var_id in
{ bv; projection = p.projection }
let mk_opt_mplace (span : Meta.span) (p : place option)
(ctx : Contexts.eval_ctx) : mplace option =
Option.map (fun p -> mk_mplace span p ctx) p
let mk_opt_place_from_op (span : Meta.span) (op : operand)
(ctx : Contexts.eval_ctx) : mplace option =
match op with
| Copy p | Move p -> Some (mk_mplace span p ctx)
| Constant _ -> None
let mk_espan (m : espan) (e : expression) : expression = Meta (m, e)
let synthesize_symbolic_expansion (span : Meta.span) (sv : symbolic_value)
(place : mplace option) (seel : symbolic_expansion option list)
(el : expression list) : expression =
let ls = List.combine seel el in
(* Match on the symbolic value type to know which can of expansion happened *)
let expansion =
match sv.sv_ty with
| TLiteral TBool -> (
(* Boolean expansion: there should be two branches *)
match ls with
| [
(Some (SeLiteral (VBool true)), true_exp);
(Some (SeLiteral (VBool false)), false_exp);
] ->
ExpandBool (true_exp, false_exp)
| _ -> craise __FILE__ __LINE__ span "Ill-formed boolean expansion")
| TLiteral (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 = Collections.List.pop_last ls in
(* For all the regular branches, the symbolic value should have
* been expanded to a constant *)
let get_scalar (see : symbolic_expansion option) : scalar_value =
match see with
| Some (SeLiteral (VScalar cv)) ->
sanity_check __FILE__ __LINE__ (cv.int_ty = int_ty) span;
cv
| _ -> craise __FILE__ __LINE__ span "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
sanity_check __FILE__ __LINE__ (otherwise_see = None) span;
(* Return *)
ExpandInt (int_ty, branches, otherwise)
| TAdt (_, _) ->
(* Branching: it is necessarily an enumeration expansion *)
let get_variant (see : symbolic_expansion option) :
VariantId.id option * symbolic_value list =
match see with
| Some (SeAdt (vid, fields)) -> (vid, fields)
| _ ->
craise __FILE__ __LINE__ span "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
| TRef (_, _, _) -> (
(* Reference expansion: there should be one branch *)
match ls with
| [ (Some see, exp) ] -> ExpandNoBranch (see, exp)
| _ -> craise __FILE__ __LINE__ span "Ill-formed borrow expansion")
| TVar _ | TLiteral TChar | TNever | TTraitType _ | TArrow _ | TRawPtr _ ->
craise __FILE__ __LINE__ span "Ill-formed symbolic expansion"
in
Expansion (place, sv, expansion)
let synthesize_symbolic_expansion_no_branching (span : Meta.span)
(sv : symbolic_value) (place : mplace option) (see : symbolic_expansion)
(e : expression) : expression =
synthesize_symbolic_expansion span sv place [ Some see ] [ e ]
let synthesize_function_call (call_id : call_id) (ctx : Contexts.eval_ctx)
(sg : fun_sig option) (regions_hierarchy : region_var_groups)
(abstractions : AbstractionId.id list) (generics : generic_args)
(trait_method_generics : (generic_args * trait_instance_id) option)
(args : typed_value list) (args_places : mplace option list)
(dest : symbolic_value) (dest_place : mplace option) (e : expression) :
expression =
let call =
{
call_id;
ctx;
sg;
regions_hierarchy;
abstractions;
generics;
trait_method_generics;
args;
dest;
args_places;
dest_place;
}
in
FunCall (call, e)
let synthesize_global_eval (gid : GlobalDeclId.id) (generics : generic_args)
(dest : symbolic_value) (e : expression) : expression =
EvalGlobal (gid, generics, dest, e)
let synthesize_regular_function_call (fun_id : fun_id_or_trait_method_ref)
(call_id : FunCallId.id) (ctx : Contexts.eval_ctx) (sg : fun_sig)
(regions_hierarchy : region_var_groups)
(abstractions : AbstractionId.id list) (generics : generic_args)
(trait_method_generics : (generic_args * trait_instance_id) option)
(args : typed_value list) (args_places : mplace option list)
(dest : symbolic_value) (dest_place : mplace option) (e : expression) :
expression =
synthesize_function_call
(Fun (fun_id, call_id))
ctx (Some sg) regions_hierarchy abstractions generics trait_method_generics
args args_places dest dest_place e
let synthesize_unary_op (ctx : Contexts.eval_ctx) (unop : unop)
(arg : typed_value) (arg_place : mplace option) (dest : symbolic_value)
(dest_place : mplace option) (e : expression) : expression =
let generics = empty_generic_args in
synthesize_function_call (Unop unop) ctx None [] [] generics None [ arg ]
[ arg_place ] dest dest_place e
let synthesize_binary_op (ctx : Contexts.eval_ctx) (binop : binop)
(arg0 : typed_value) (arg0_place : mplace option) (arg1 : typed_value)
(arg1_place : mplace option) (dest : symbolic_value)
(dest_place : mplace option) (e : expression) : expression =
let generics = empty_generic_args in
synthesize_function_call (Binop binop) ctx None [] [] generics None
[ arg0; arg1 ] [ arg0_place; arg1_place ] dest dest_place e
let synthesize_end_abstraction (ctx : Contexts.eval_ctx) (abs : abs)
(e : expression) : expression =
EndAbstraction (ctx, abs, e)
let synthesize_assignment (ctx : Contexts.eval_ctx) (lplace : mplace)
(rvalue : typed_value) (rplace : mplace option) (e : expression) :
expression =
Meta (Assignment (ctx, lplace, rvalue, rplace), e)
let synthesize_assertion (ctx : Contexts.eval_ctx) (v : typed_value)
(e : expression) =
Assertion (ctx, v, e)
let synthesize_forward_end (ctx : Contexts.eval_ctx)
(loop_input_values : typed_value SymbolicValueId.Map.t option)
(e : expression) (el : expression RegionGroupId.Map.t) =
ForwardEnd (ctx, loop_input_values, e, el)
let synthesize_loop (loop_id : LoopId.id) (input_svalues : symbolic_value list)
(fresh_svalues : SymbolicValueId.Set.t)
(rg_to_given_back_tys : ty list RegionGroupId.Map.t) (end_expr : expression)
(loop_expr : expression) (span : Meta.span) : expression =
Loop
{
loop_id;
input_svalues;
fresh_svalues;
rg_to_given_back_tys;
end_expr;
loop_expr;
span;
}
let save_snapshot (ctx : Contexts.eval_ctx) (e : expression) : expression =
Meta (Snapshot ctx, e)
|
