[infer][IR] introduce a fold function over the procedure descriptions in a file to avoid make copies of mutable data-structures

Summary: This should avoid making copies of procedure descriptions which are mutable data-stuctures.

Reviewed By: sblackshear

Differential Revision: D6658527

fbshipit-source-id: 688a142

infer/src/IR/Cfg.ml

@@ -24,6 +24,8 @@ let remove_proc_desc cfg pname = Typ.Procname.Hash.remove cfg pname
 
 let iter_proc_desc cfg f = Typ.Procname.Hash.iter f cfg
 
+let fold_proc_desc cfg f init = Typ.Procname.Hash.fold f cfg init
+
 let find_proc_desc_from_name cfg pname =
   try Some (Typ.Procname.Hash.find cfg pname) with Not_found -> None
 
@@ -59,9 +61,6 @@ let get_all_procs cfg =
   iter_proc_desc cfg f ; !procs
 
 
-(** Get the procedures whose body is defined in this cfg *)
-let get_defined_procs cfg = List.filter ~f:Procdesc.is_defined (get_all_procs cfg)
-
 (** checks whether a cfg is connected or not *)
 let check_cfg_connectedness cfg =
   let is_exit_node n =
@@ -83,15 +82,13 @@ let check_cfg_connectedness cfg =
       (* if the if brances end with a return *)
       match succs with [n'] when is_exit_node n' -> false | _ -> Int.equal (List.length preds) 0
   in
-  let do_pdesc pd =
-    let pname = Procdesc.get_proc_name pd in
+  let do_pdesc pname pd =
     let nodes = Procdesc.get_nodes pd in
     (* TODO (T20302015): also check the CFGs for the C-like procedures *)
     if not Config.keep_going && Typ.Procname.is_java pname && List.exists ~f:broken_node nodes then
       L.(die InternalError) "Broken CFG on %a" Typ.Procname.pp pname
   in
-  let pdescs = get_all_procs cfg in
-  List.iter ~f:do_pdesc pdescs
+  iter_proc_desc cfg do_pdesc
 
 
 let get_load_statement =
@@ -112,7 +109,7 @@ let load source =
 
 (** Save the .attr files for the procedures in the cfg. *)
 let save_attributes source_file cfg =
-  let save_proc pdesc =
+  let save_proc _ pdesc =
     let attributes = Procdesc.get_attributes pdesc in
     let loc = attributes.loc in
     let attributes' =
@@ -121,7 +118,7 @@ let save_attributes source_file cfg =
     in
     Attributes.store attributes'
   in
-  List.iter ~f:save_proc (get_all_procs cfg)
+  iter_proc_desc cfg save_proc
 
 
 (** Inline a synthetic (access or bridge) method. *)

infer/src/IR/Cfg.mli

@@ -32,15 +32,12 @@ val create_proc_desc : t -> ProcAttributes.t -> Procdesc.t
 val iter_proc_desc : t -> (Typ.Procname.t -> Procdesc.t -> unit) -> unit
 (** Iterate over all the procdesc's *)
 
+val fold_proc_desc : t -> (Typ.Procname.t -> Procdesc.t -> 'a -> 'a) -> 'a -> 'a
+(** Fold over all the procdesc's *)
+
 val find_proc_desc_from_name : t -> Typ.Procname.t -> Procdesc.t option
 (** Find the procdesc given the proc name. Return None if not found. *)
 
-val get_all_procs : t -> Procdesc.t list
-(** Get all the procedures (defined and declared) *)
-
-val get_defined_procs : t -> Procdesc.t list
-(** Get the procedures whose body is defined in this cfg *)
-
 val iter_all_nodes : ?sorted:bool -> (Procdesc.t -> Procdesc.Node.t -> unit) -> t -> unit
 (** Iterate over all the nodes in the cfg *)
 

infer/src/backend/callbacks.ml

@@ -55,7 +55,7 @@ let iterate_procedure_callbacks get_proc_desc exe_env summary proc_desc =
   let get_procs_in_file proc_name =
     match Exe_env.get_cfg exe_env proc_name with
     | Some cfg ->
-        List.map ~f:Procdesc.get_proc_name (Cfg.get_all_procs cfg)
+        Cfg.fold_proc_desc cfg (fun pname _ accu -> pname :: accu) []
     | None ->
         []
   in

infer/src/backend/printer.ml

@@ -546,15 +546,19 @@ let write_all_html_files cluster =
   let linereader = LineReader.create () in
   Exe_env.iter_files
     (fun _ cfg ->
-      let source_files_in_cfg =
-        let files = ref SourceFile.Set.empty in
-        Cfg.iter_proc_desc cfg (fun _ proc_desc ->
+      let source_files_in_cfg, pdescs_in_cfg =
+        Cfg.fold_proc_desc cfg
+          (fun _ proc_desc (files, pdescs) ->
+            let updated_files =
               if Procdesc.is_defined proc_desc then
                 let file = (Procdesc.get_loc proc_desc).Location.file in
-              if is_whitelisted file then files := SourceFile.Set.add file !files else () ) ;
-        !files
+                if is_whitelisted file then SourceFile.Set.add file files else files
+              else files
+            in
+            (updated_files, proc_desc :: pdescs) )
+          (SourceFile.Set.empty, [])
       in
       SourceFile.Set.iter
-        (fun file -> write_html_file linereader file (Cfg.get_all_procs cfg))
+        (fun file -> write_html_file linereader file pdescs_in_cfg)
         source_files_in_cfg )
     exe_env

infer/src/checkers/NullabilityPreanalysis.ml

@@ -94,9 +94,8 @@ let add_nonnull_to_fields fields tenv =
 
 let analysis cfg tenv =
   let initial = FieldsAssignedInConstructors.empty in
-  let f domain pdesc =
-    let proc_name = Procdesc.get_proc_name pdesc in
-    if Typ.Procname.is_constructor proc_name then
+  let f proc_name pdesc domain =
+    if Procdesc.is_defined pdesc && Typ.Procname.is_constructor proc_name then
       match
         FieldsAssignedInConstructorsChecker.compute_post
           (ProcData.make pdesc tenv (Ident.IdentHash.create 10))
@@ -108,6 +107,5 @@ let analysis cfg tenv =
           domain
     else domain
   in
-  let procs = Cfg.get_defined_procs cfg in
-  let fields_assigned_in_constructor = List.fold ~f ~init:initial procs in
+  let fields_assigned_in_constructor = Cfg.fold_proc_desc cfg f initial in
   add_nonnull_to_fields fields_assigned_in_constructor tenv