1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
|
open RTL
open Maps
open Camlcoq
let p2i r = P.to_int r
let get_some = function
| None -> failwith "Got None instead of Some _"
| Some thing -> thing
let successors_inst = function
| Inop n
| Iop (_, _, _, n)
| Iload (_, _, _, _, _, n)
| Istore (_, _, _, _, n)
| Icall (_, _, _, _, n)
| Ibuiltin (_, _, _, n) ->
[ n ]
| Icond (_, _, n1, n2, _) -> [ n1; n2 ]
| Ijumptable (_, l) -> l
| Itailcall _ | Ireturn _ -> []
let predicted_successor = function
| Inop n | Iop (_, _, _, n) | Iload (_, _, _, _, _, n) | Istore (_, _, _, _, n)
->
Some n
| Icall (_, _, _, _, n) | Ibuiltin (_, _, _, n) -> None
| Icond (_, _, n1, n2, p) -> (
match p with Some true -> Some n1 | Some false -> Some n2 | None -> None)
| Ijumptable _ | Itailcall _ | Ireturn _ -> None
let non_predicted_successors i = function
| None -> successors_inst i
| Some ps -> List.filter (fun s -> s != ps) (successors_inst i)
(* adapted from Linearizeaux.get_join_points *)
let get_join_points code entry =
let reached = ref (PTree.map (fun n i -> false) code) in
let reached_twice = ref (PTree.map (fun n i -> false) code) in
let rec traverse pc =
if get_some @@ PTree.get pc !reached then begin
if not (get_some @@ PTree.get pc !reached_twice) then
reached_twice := PTree.set pc true !reached_twice
end else begin
reached := PTree.set pc true !reached;
traverse_succs (successors_inst @@ get_some @@ PTree.get pc code)
end
and traverse_succs = function
| [] -> ()
| [pc] -> traverse pc
| pc :: l -> traverse pc; traverse_succs l
in traverse entry; !reached_twice
|
