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Exclude pruned witness lifter prevs from ARG construction #1027

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Apr 1, 2023
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Exclude pruned witness lifter prevs from ARG construction #1027

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18 changes: 15 additions & 3 deletions src/witness/argTools.ml
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Original file line number Diff line number Diff line change
Expand Up @@ -103,14 +103,26 @@ struct

let create entrystates: (module BiArg with type Node.t = MyCFG.node * Spec.C.t * int) =
let (witness_prev_map, witness_prev, witness_next) =
(* Get all existing vars *)
let vars = NHT.create 100 in
LHT.iter (fun lvar local ->
ask_local lvar ~local (IterVars (fun i ->
let lvar' = (fst lvar, snd lvar, i) in
NHT.replace vars lvar' ()
))
) lh;

let prev = NHT.create 100 in
let next = NHT.create 100 in
LHT.iter (fun lvar local ->
ignore (ask_local lvar ~local (Queries.IterPrevVars (fun i (prev_node, prev_c_obj, j) edge ->
let lvar' = (fst lvar, snd lvar, i) in
let prev_lvar: NHT.key = (prev_node, Obj.obj prev_c_obj, j) in
NHT.modify_def [] lvar' (fun prevs -> (edge, prev_lvar) :: prevs) prev;
NHT.modify_def [] prev_lvar (fun nexts -> (edge, lvar') :: nexts) next
(* Exclude accumulated prevs, which were pruned *)
if NHT.mem vars prev_lvar then (
let lvar' = (fst lvar, snd lvar, i) in
NHT.modify_def [] lvar' (fun prevs -> (edge, prev_lvar) :: prevs) prev;
NHT.modify_def [] prev_lvar (fun nexts -> (edge, lvar') :: nexts) next
)
)))
) lh;

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