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(*
Copyright © 2011 MLstate
This file is part of OPA.
OPA is free software: you can redistribute it and/or modify it under the
terms of the GNU Affero General Public License, version 3, as published by
the Free Software Foundation.
OPA is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for
more details.
You should have received a copy of the GNU Affero General Public License
along with OPA. If not, see <http://www.gnu.org/licenses/>.
*)
module Q = QmlAst
module List = Base.List
type env = Q.pat IdentMap.t
type ignored_directive = [ Q.type_directive | Q.slicer_directive ]
module S =
struct
type t = (QmlAst.annotmap * env)
let pass = "pass_SimplifyEquality"
let pp f (_,map) =
IdentMap.iter
(fun k v ->
Format.fprintf f "@[<2>%s -> %a@]@\n" (Ident.to_string k) QmlPrint.pp#pat v
) map
end
module R =
struct
include ObjectFiles.Make(S)
let save ~loaded_env ~env ~annotmap =
let diff = IdentMap.diff env loaded_env in
let small_annotmap = QmlRefresh.restrict_annotmap_fold_pat
(fun r acc map ->
IdentMap.fold
(fun _ pat acc ->
r acc pat
) map acc
) annotmap diff in
save (small_annotmap, diff)
let load annotmap =
fold_with_name
(fun package (annotmap,env) (annotmap_old,map) ->
let annotmap_old = QmlRefresh.refresh_annotmap package annotmap_old in
IdentMap.fold
(fun k pat (annotmap,env) ->
let annotmap, pat = QmlRefresh.refresh_pat package ~annotmap_old annotmap pat in
annotmap, IdentMap.add k pat env
) map (annotmap,env)
) (annotmap,IdentMap.empty)
end
(* FIXME: when the pattern ast is better, we won't need the annotmap here *)
let rec pattern_of_expr env annotmap = function
| Q.Ident (_, i) -> (
let previous =
try
IdentMap.find i env
with
| Not_found -> raise Exit
in
QmlAstCons.TypedPat.copy annotmap previous
)
| Q.Const (label, const_expr) ->
(* not rewriting a == 0 into match a with 0 -> ...*)
annotmap, Q.PatConst (label, const_expr)
| Q.Coerce (_, e, _)
| Q.Directive (_, #ignored_directive, [e], _) ->
pattern_of_expr env annotmap e
| Q.Record (_label, sel) ->
let annotmap, spl = List.fold_left_map
(fun annotmap (s, e) ->
let annotmap, p = pattern_of_expr env annotmap e in
annotmap, (s, p)) annotmap sel in
QmlAstCons.TypedPat.record annotmap spl
| _ -> raise Exit
let pattern_of_expr env annotmap e = pattern_of_expr env annotmap e
let rec is_patemptyrecord = function
| Q.PatCoerce (_, e, _) -> is_patemptyrecord e
| Q.PatRecord (_, [], _) -> true
| _ -> false
let rec is_simple_patrecord = function
| Q.PatCoerce (_, e, _) -> is_simple_patrecord e
| Q.PatRecord (_, [field_name, field_value], `closed) ->
if is_patemptyrecord field_value then Some field_name else None
| _ -> None
let rec get_name = function
| Q.Coerce (_, e, _)
| Q.Directive (_, #ignored_directive, [e], _) -> get_name e
| Q.Ident (_, i) -> Some i
| _ -> None
let generate_match ?e1 ?e2 gamma annotmap kind expr pat =
let annotmap, any = QmlAstCons.TypedPat.any annotmap in
let annotmap, e1 =
match e1 with
| None -> QmlAstCons.TypedExpr._true (annotmap,gamma)
| Some e1 -> annotmap, e1 in
let annotmap, e2 =
match e2 with
| None -> QmlAstCons.TypedExpr._false (annotmap,gamma)
| Some e2 -> annotmap, e2 in
let e1, e2 =
match kind with
| `equality -> e1, e2
| `inequality -> e2, e1 in
QmlAstCons.TypedExpr.match_ annotmap expr [pat, e1; any, e2]
let rec match_equality_to_record env annotmap equality_ident inequality_ident = function
| Q.Coerce (_, e, _)
| Q.Directive (_, #Q.type_directive, [e], _) -> match_equality_to_record env annotmap equality_ident inequality_ident e
| Q.Apply (_, Q.Ident (_, i), [e1;e2]) ->
let ident =
if Ident.equal i equality_ident then
Some `equality
else if Ident.equal i inequality_ident then
Some `inequality
else
None in (
match ident with
| Some kind -> (
try
let annotmap, p = pattern_of_expr env annotmap e1 in
Some (annotmap, kind, e2, p)
with Exit ->
try
let annotmap, p = pattern_of_expr env annotmap e2 in
Some (annotmap, kind, e1, p)
with Exit ->
None
)
| None -> None
)
| _ -> None
let update_env env annotmap iel =
List.fold_left
(fun (env, annotmap) (i, e) ->
try
let annotmap, p = pattern_of_expr env annotmap e in
IdentMap.add i p env, annotmap
with Exit ->
match get_name e with
| Some j -> (
try (IdentMap.add i (IdentMap.find j env) env, annotmap)
with Not_found -> (env, annotmap)
)
| None ->
(env, annotmap)
) (env, annotmap) iel
let rewrite_equality_expr equality_ident inequality_ident gamma acc e =
let aux self tra env acc e =
match e with
| Q.LetIn (_, iel, _)
| Q.LetRecIn (_, iel, _) ->
let env, acc = update_env env acc iel in
tra env acc e
| Q.Match (_, e0, [p1,e1; p2,e2]) ->
(match is_simple_patrecord p1, is_simple_patrecord p2 with
| Some "true", Some "false" ->
(match match_equality_to_record env acc equality_ident inequality_ident e0 with
| None -> tra env acc e
| Some (acc, kind, e, p) ->
let acc, e = generate_match gamma ~e1 ~e2 acc kind e p in
self env acc e
)
| _ -> tra env acc e)
| _ ->
match match_equality_to_record env acc equality_ident inequality_ident e with
| None -> tra env acc e
| Some (acc, kind, e, p) ->
let acc, e = generate_match gamma acc kind e p in
self env acc e
in
QmlAstWalk.Expr.self_traverse_foldmap_context_down aux acc e
let rewrite_equality equality_ident inequality_ident env gamma annotmap code =
List.fold_left_map
(fun (env,acc) -> function
| Q.NewVal (label,iel)
| Q.NewValRec (label,iel) as c ->
let env, acc = update_env env acc iel in
let acc, iel =
List.fold_left_map
(fun acc (i,e) ->
let acc, e = rewrite_equality_expr equality_ident inequality_ident gamma env acc e in
acc, (i,e)) acc iel in
(match c with
| Q.NewVal _ -> (env, acc), Q.NewVal (label, iel)
| Q.NewValRec _ -> (env, acc), Q.NewValRec (label, iel)
| _ -> assert false)
| c -> (env, acc), c) (env,annotmap) code
let process_code val_ gamma annotmap code =
#<If:SIMPLIFYMAGIC_DISABLE>
annotmap, code
#<Else>
try
let annotmap, loaded_env = R.load annotmap in
let equality_ident = val_ Opacapi.(==) in
let inequality_ident = val_ Opacapi.(!=) in
let (env, annotmap), code = rewrite_equality equality_ident inequality_ident loaded_env gamma annotmap code in
R.save ~loaded_env ~env ~annotmap;
annotmap, code
with
| Not_found (* no equality *)
| QmlTyperException.Exception _ (* no boolean type *) ->
R.save ~loaded_env:IdentMap.empty ~env:IdentMap.empty ~annotmap;
annotmap, code
#<End>
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