infer_clone/infer/src/backend/specs.ml

(*
 * Copyright (c) 2009 - 2013 Monoidics ltd.
 * Copyright (c) 2013 - present Facebook, Inc.
 * All rights reserved.
 *
 * This source code is licensed under the BSD style license found in the
 * LICENSE file in the root directory of this source tree. An additional grant
 * of patent rights can be found in the PATENTS file in the same directory.
 *)

open! IStd
open! PVariant
module Hashtbl = Caml.Hashtbl

(** Specifications and spec table *)

module L = Logging
module F = Format

(* =============== START of support for spec tables =============== *)

(** Module for joined props *)
module Jprop = struct
  (* type aliases for component of t values that compare should ignore *)
  type _id = int

  let compare__id _ _ = 0

  (** Remember when a prop is obtained as the join of two other props; the first parameter is an id *)
  type 'a t =
    | Prop of _id * 'a Prop.t
    | Joined of _id * 'a Prop.t * 'a t * 'a t
    [@@deriving compare]

  (** Comparison for joined_prop *)
  let compare jp1 jp2 = compare (fun _ _ -> 0) jp1 jp2

  (** Return true if the two join_prop's are equal *)
  let equal jp1 jp2 = Int.equal (compare jp1 jp2) 0

  let to_prop = function Prop (_, p) -> p | Joined (_, p, _, _) -> p

  let to_number = function Prop (n, _) -> n | Joined (n, _, _, _) -> n

  let rec fav_add_dfs tenv fav = function
    | Prop (_, p)
     -> Prop.prop_fav_add_dfs tenv fav p
    | Joined (_, p, jp1, jp2)
     -> Prop.prop_fav_add_dfs tenv fav p ; fav_add_dfs tenv fav jp1 ; fav_add_dfs tenv fav jp2

  let rec normalize tenv = function
    | Prop (n, p)
     -> Prop (n, Prop.normalize tenv p)
    | Joined (n, p, jp1, jp2)
     -> Joined (n, Prop.normalize tenv p, normalize tenv jp1, normalize tenv jp2)

  (** Return a compact representation of the jprop *)
  let rec compact sh = function
    | Prop (n, p)
     -> Prop (n, Prop.prop_compact sh p)
    | Joined (n, p, jp1, jp2)
     -> Joined (n, Prop.prop_compact sh p, compact sh jp1, compact sh jp2)

  (** Print the toplevel prop *)
  let pp_short pe f jp = Prop.pp_prop pe f (to_prop jp)

  (** Dump the toplevel prop *)
  let d_shallow (jp: Prop.normal t) = L.add_print_action (L.PTjprop_short, Obj.repr jp)

  (** Get identifies of the jprop *)
  let get_id = function Prop (n, _) -> n | Joined (n, _, _, _) -> n

  (** Print a list of joined props, the boolean indicates whether to print subcomponents of joined props *)
  let pp_list pe shallow f jplist =
    let rec pp_seq_newline f = function
      | []
       -> ()
      | [(Prop (n, p))]
       -> F.fprintf f "PROP %d:@\n%a" n (Prop.pp_prop pe) p
      | [(Joined (n, p, p1, p2))]
       -> if not shallow then F.fprintf f "%a@\n" pp_seq_newline [p1] ;
          if not shallow then F.fprintf f "%a@\n" pp_seq_newline [p2] ;
          F.fprintf f "PROP %d (join of %d,%d):@\n%a" n (get_id p1) (get_id p2) (Prop.pp_prop pe) p
      | jp :: l
       -> F.fprintf f "%a@\n" pp_seq_newline [jp] ;
          pp_seq_newline f l
    in
    pp_seq_newline f jplist

  (** dump a joined prop list, the boolean indicates whether to print toplevel props only *)
  let d_list (shallow: bool) (jplist: Prop.normal t list) =
    L.add_print_action (L.PTjprop_list, Obj.repr (shallow, jplist))

  let rec fav_add fav = function
    | Prop (_, p)
     -> Prop.prop_fav_add fav p
    | Joined (_, p, jp1, jp2)
     -> Prop.prop_fav_add fav p ; fav_add fav jp1 ; fav_add fav jp2

  let rec jprop_sub sub = function
    | Prop (n, p)
     -> Prop (n, Prop.prop_sub sub p)
    | Joined (n, p, jp1, jp2)
     -> let p' = Prop.prop_sub sub p in
        let jp1' = jprop_sub sub jp1 in
        let jp2' = jprop_sub sub jp2 in
        Joined (n, p', jp1', jp2')

  let filter (f: 'a t -> 'b option) jpl =
    let rec do_filter acc = function
      | []
       -> acc
      | (Prop _ as jp) :: jpl -> (
        match f jp with Some x -> do_filter (x :: acc) jpl | None -> do_filter acc jpl )
      | (Joined (_, _, jp1, jp2) as jp) :: jpl ->
        match f jp with
        | Some x
         -> do_filter (x :: acc) jpl
        | None
         -> do_filter acc (jpl @ [jp1; jp2])
    in
    do_filter [] jpl

  let rec map (f: 'a Prop.t -> 'b Prop.t) = function
    | Prop (n, p)
     -> Prop (n, f p)
    | Joined (n, p, jp1, jp2)
     -> Joined (n, f p, map f jp1, map f jp2)

  (*
  let rec jprop_sub sub = function
    | Prop (n, p) -> Prop (n, Prop.prop_sub sub p)
    | Joined (n, p, jp1, jp2) ->
        Joined (n, Prop.prop_sub sub p, jprop_sub sub jp1, jprop_sub sub jp2)
*)
end

(***** End of module Jprop *****)

module Visitedset = Caml.Set.Make (struct
  type t = Procdesc.Node.id * int list

  let compare (node_id1, _) (node_id2, _) = Procdesc.Node.compare_id node_id1 node_id2
end)

let visited_str vis =
  let s = ref "" in
  let lines = ref Int.Set.empty in
  let do_one (_, ns) =
    (* if List.length ns > 1 then
       begin
       let ss = ref "" in
       List.iter ~f:(fun n -> ss := !ss ^ " " ^ string_of_int n) ns;
       L.out "Node %d has lines %s@." node !ss
       end; *)
    List.iter ~f:(fun n -> lines := Int.Set.add !lines n) ns
  in
  Visitedset.iter do_one vis ;
  Int.Set.iter ~f:(fun n -> s := !s ^ " " ^ string_of_int n) !lines ;
  !s

(** A spec consists of:
    pre: a joined prop
    post: a list of props with path
    visited: a list of pairs (node_id, line) for the visited nodes *)
type 'a spec = {pre: 'a Jprop.t; posts: ('a Prop.t * Paths.Path.t) list; visited: Visitedset.t}

(** encapsulate type for normalized specs *)
module NormSpec : sig
  type t

  val normalize : Tenv.t -> Prop.normal spec -> t

  val tospecs : t list -> Prop.normal spec list

  val compact : Sil.sharing_env -> t -> t
  (** Return a compact representation of the spec *)

  val erase_join_info_pre : Tenv.t -> t -> t
  (** Erase join info from pre of spec *)
end = struct
  type t = Prop.normal spec

  let tospecs specs = specs

  let spec_fav tenv (spec: Prop.normal spec) : Sil.fav =
    let fav = Sil.fav_new () in
    Jprop.fav_add_dfs tenv fav spec.pre ;
    List.iter ~f:(fun (p, _) -> Prop.prop_fav_add_dfs tenv fav p) spec.posts ;
    fav

  let spec_sub tenv sub spec =
    { pre= Jprop.normalize tenv (Jprop.jprop_sub sub spec.pre)
    ; posts=
        List.map ~f:(fun (p, path) -> (Prop.normalize tenv (Prop.prop_sub sub p), path)) spec.posts
    ; visited= spec.visited }

  (** Convert spec into normal form w.r.t. variable renaming *)
  let normalize tenv (spec: Prop.normal spec) : Prop.normal spec =
    let fav = spec_fav tenv spec in
    let idlist = Sil.fav_to_list fav in
    let count = ref 0 in
    let sub =
      Sil.subst_of_list
        (List.map
           ~f:(fun id -> incr count ; (id, Exp.Var (Ident.create_normal Ident.name_spec !count)))
           idlist)
    in
    spec_sub tenv sub spec

  (** Return a compact representation of the spec *)
  let compact sh spec =
    let pre = Jprop.compact sh spec.pre in
    let posts = List.map ~f:(fun (p, path) -> (Prop.prop_compact sh p, path)) spec.posts in
    {pre; posts; visited= spec.visited}

  (** Erase join info from pre of spec *)
  let erase_join_info_pre tenv spec =
    let spec' = {spec with pre= Jprop.Prop (1, Jprop.to_prop spec.pre)} in
    normalize tenv spec'
end

(** Convert spec into normal form w.r.t. variable renaming *)
let spec_normalize = NormSpec.normalize

(** Cast a list of normalized specs to a list of specs *)
let normalized_specs_to_specs = NormSpec.tospecs

module CallStats = struct
  (** module for tracing stats of function calls *)
  module PnameLocHash = Hashtbl.Make (struct
    type t = Typ.Procname.t * Location.t

    let hash (pname, loc) = Hashtbl.hash (Typ.Procname.hash_pname pname, loc.Location.line)

    let equal = [%compare.equal : Typ.Procname.t * Location.t]
  end)

  (** kind of result of a procedure call *)
  type call_result =
    | CR_success  (** successful call *)
    | CR_not_met  (** precondition not met *)
    | CR_not_found  (** the callee has no specs *)
    | CR_skip  (** the callee was skipped *)

  type trace = (call_result * bool) list

  type t = trace PnameLocHash.t

  let trace_add tr (res: call_result) in_footprint = (res, in_footprint) :: tr

  let empty_trace : trace = []

  let init calls =
    let hash = PnameLocHash.create 1 in
    let do_call pn_loc = PnameLocHash.add hash pn_loc empty_trace in
    List.iter ~f:do_call calls ; hash

  let trace t proc_name loc res in_footprint =
    let tr_old =
      try PnameLocHash.find t (proc_name, loc)
      with Not_found ->
        PnameLocHash.add t (proc_name, loc) empty_trace ;
        empty_trace
    in
    let tr_new = trace_add tr_old res in_footprint in
    PnameLocHash.replace t (proc_name, loc) tr_new

  let tr_elem_str (cr, in_footprint) =
    let s1 =
      match cr with
      | CR_success
       -> "OK"
      | CR_not_met
       -> "NotMet"
      | CR_not_found
       -> "NotFound"
      | CR_skip
       -> "Skip"
    in
    let s2 = if in_footprint then "FP" else "RE" in
    s1 ^ ":" ^ s2

  let pp_trace fmt tr = Pp.seq (fun fmt x -> F.fprintf fmt "%s" (tr_elem_str x)) fmt (List.rev tr)

  let iter f t =
    let elems = ref [] in
    PnameLocHash.iter (fun x tr -> elems := (x, tr) :: !elems) t ;
    let sorted_elems =
      let compare (pname_loc1, _) (pname_loc2, _) =
        [%compare : Typ.Procname.t * Location.t] pname_loc1 pname_loc2
      in
      List.sort ~cmp:compare !elems
    in
    List.iter ~f:(fun (x, tr) -> f x tr) sorted_elems

  (*
  let pp fmt t =
    let do_call (pname, loc) tr =
      F.fprintf fmt "%a %a: %a@\n" Typ.Procname.pp pname Location.pp loc pp_trace tr in
    iter do_call t
*)
end

(** stats of the calls performed during the analysis *)
type call_stats = CallStats.t

(** Execution statistics *)
type stats =
  { stats_failure: SymOp.failure_kind option
        (** what type of failure stopped the analysis (if any) *)
  ; symops: int  (** Number of SymOp's throughout the whole analysis of the function *)
  ; mutable nodes_visited_fp: IntSet.t  (** Nodes visited during the footprint phase *)
  ; mutable nodes_visited_re: IntSet.t  (** Nodes visited during the re-execution phase *)
  ; call_stats: call_stats }

type status = Pending | Analyzed [@@deriving compare]

let string_of_status = function Pending -> "Pending" | Analyzed -> "Analyzed"

let pp_status fmt status = F.fprintf fmt "%s" (string_of_status status)

let equal_status = [%compare.equal : status]

type phase = FOOTPRINT | RE_EXECUTION [@@deriving compare]

let equal_phase = [%compare.equal : phase]

(** Payload: results of some analysis *)
type payload =
  { preposts: NormSpec.t list option  (** list of specs *)
  ; typestate: unit TypeState.t option  (** final typestate *)
  ; annot_map: AnnotReachabilityDomain.astate option
  ; crashcontext_frame: Stacktree_t.stacktree option
        (** Proc location and blame_range info for crashcontext analysis *)
  ; quandary: QuandarySummary.t option
  ; resources: ResourceLeakDomain.summary option
  ; siof: SiofDomain.astate option
  ; threadsafety: ThreadSafetyDomain.summary option
  ; buffer_overrun: BufferOverrunDomain.Summary.t option }

type summary =
  { nodes: Procdesc.Node.id list  (** ids of cfg nodes of the procedure *)
  ; phase: phase  (** in FOOTPRINT phase or in RE_EXECUTION PHASE *)
  ; payload: payload  (** payload containing the result of some analysis *)
  ; sessions: int ref  (** Session number: how many nodes went trough symbolic execution *)
  ; stats: stats  (** statistics: execution time and list of errors *)
  ; status: status  (** Analysis status of the procedure *)
  ; attributes: ProcAttributes.t  (** Attributes of the procedure *)
  ; proc_desc_option: Procdesc.t option }

type spec_tbl = summary Typ.Procname.Hash.t

let spec_tbl : spec_tbl = Typ.Procname.Hash.create 128

let clear_spec_tbl () = Typ.Procname.Hash.clear spec_tbl

let pp_failure_kind_opt fmt failure_kind_opt =
  match failure_kind_opt with
  | Some failure_kind
   -> SymOp.pp_failure_kind fmt failure_kind
  | None
   -> F.fprintf fmt "NONE"

let pp_errlog fmt err_log =
  F.fprintf fmt "ERRORS: @[<h>%a@]@\n%!" Errlog.pp_errors err_log ;
  F.fprintf fmt "WARNINGS: @[<h>%a@]" Errlog.pp_warnings err_log

let pp_stats fmt stats =
  F.fprintf fmt "FAILURE:%a SYMOPS:%d@\n" pp_failure_kind_opt stats.stats_failure stats.symops

(** Print the spec *)
let pp_spec pe num_opt fmt spec =
  let num_str =
    match num_opt with
    | None
     -> "----------"
    | Some (n, tot)
     -> Format.sprintf "%d of %d [nvisited:%s]" n tot (visited_str spec.visited)
  in
  let pre = Jprop.to_prop spec.pre in
  let pe_post = Prop.prop_update_obj_sub pe pre in
  let post_list = List.map ~f:fst spec.posts in
  match pe.Pp.kind with
  | TEXT
   -> F.fprintf fmt "--------------------------- %s ---------------------------@\n" num_str ;
      F.fprintf fmt "PRE:@\n%a@\n" (Prop.pp_prop Pp.text) pre ;
      F.fprintf fmt "%a@\n" (Propgraph.pp_proplist pe_post "POST" (pre, true)) post_list ;
      F.fprintf fmt "----------------------------------------------------------------"
  | HTML
   -> F.fprintf fmt "--------------------------- %s ---------------------------@\n" num_str ;
      F.fprintf fmt "PRE:@\n%a%a%a@\n" Io_infer.Html.pp_start_color Pp.Blue
        (Prop.pp_prop (Pp.html Blue))
        pre Io_infer.Html.pp_end_color () ;
      F.fprintf fmt "%a" (Propgraph.pp_proplist pe_post "POST" (pre, true)) post_list ;
      F.fprintf fmt "----------------------------------------------------------------"
  | LATEX
   -> F.fprintf fmt "\\textbf{\\large Requires}\\\\@\n@[%a%a%a@]\\\\@\n" Latex.pp_color Pp.Blue
        (Prop.pp_prop (Pp.latex Blue))
        pre Latex.pp_color pe.Pp.color ;
      F.fprintf fmt "\\textbf{\\large Ensures}\\\\@\n@[%a@]"
        (Propgraph.pp_proplist pe_post "POST" (pre, true))
        post_list

(** Dump a spec *)
let d_spec (spec: 'a spec) = L.add_print_action (L.PTspec, Obj.repr spec)

let pp_specs pe fmt specs =
  let total = List.length specs in
  let cnt = ref 0 in
  match pe.Pp.kind with
  | TEXT
   -> List.iter
        ~f:(fun spec ->
          incr cnt ;
          F.fprintf fmt "%a" (pp_spec pe (Some (!cnt, total))) spec)
        specs
  | HTML
   -> List.iter
        ~f:(fun spec ->
          incr cnt ;
          F.fprintf fmt "%a<br>@\n" (pp_spec pe (Some (!cnt, total))) spec)
        specs
  | LATEX
   -> List.iter
        ~f:(fun spec ->
          incr cnt ;
          F.fprintf fmt "\\subsection*{Spec %d of %d}@\n\\(%a\\)@\n" !cnt total (pp_spec pe None)
            spec)
        specs

let describe_phase summary =
  ("Phase", if equal_phase summary.phase FOOTPRINT then "FOOTPRINT" else "RE_EXECUTION")

(** Return the signature of a procedure declaration as a string *)
let get_signature summary =
  let s = ref "" in
  List.iter
    ~f:(fun (p, typ) ->
      let pp f = F.fprintf f "%a %a" (Typ.pp_full Pp.text) typ Mangled.pp p in
      let decl = F.asprintf "%t" pp in
      s := if String.equal !s "" then decl else !s ^ ", " ^ decl)
    summary.attributes.ProcAttributes.formals ;
  let pp f =
    F.fprintf f "%a %a" (Typ.pp_full Pp.text) summary.attributes.ProcAttributes.ret_type
      Typ.Procname.pp summary.attributes.ProcAttributes.proc_name
  in
  let decl = F.asprintf "%t" pp in
  decl ^ "(" ^ !s ^ ")"

let get_specs_from_preposts preposts = Option.value_map ~f:NormSpec.tospecs ~default:[] preposts

let get_specs_from_payload summary = get_specs_from_preposts summary.payload.preposts

let pp_summary_no_stats_specs fmt summary =
  let pp_pair fmt (x, y) = F.fprintf fmt "%s: %s" x y in
  F.fprintf fmt "%s@\n" (get_signature summary) ;
  F.fprintf fmt "%a@\n" pp_status summary.status ;
  F.fprintf fmt "%a@\n" pp_pair (describe_phase summary)

let pp_payload pe fmt
    { preposts
    ; typestate
    ; crashcontext_frame
    ; quandary
    ; siof
    ; threadsafety
    ; buffer_overrun
    ; annot_map } =
  let pp_opt prefix pp fmt = function
    | Some x
     -> F.fprintf fmt "%s: %a@\n" prefix pp x
    | None
     -> ()
  in
  F.fprintf fmt "%a%a%a%a%a%a%a%a@\n"
    (pp_opt "PrePosts" (pp_specs pe))
    (Option.map ~f:NormSpec.tospecs preposts)
    (pp_opt "TypeState" (TypeState.pp TypeState.unit_ext))
    typestate (pp_opt "CrashContext" Crashcontext.pp_stacktree) crashcontext_frame
    (pp_opt "Quandary" QuandarySummary.pp) quandary (pp_opt "Siof" SiofDomain.pp) siof
    (pp_opt "ThreadSafety" ThreadSafetyDomain.pp_summary) threadsafety
    (pp_opt "BufferOverrun" BufferOverrunDomain.Summary.pp) buffer_overrun
    (pp_opt "AnnotationReachability" AnnotReachabilityDomain.pp) annot_map

let pp_summary_text fmt summary =
  let err_log = summary.attributes.ProcAttributes.err_log in
  let pe = Pp.text in
  pp_summary_no_stats_specs fmt summary ;
  F.fprintf fmt "%a@\n%a%a" pp_errlog err_log pp_stats summary.stats (pp_payload pe)
    summary.payload

let pp_summary_latex color fmt summary =
  let err_log = summary.attributes.ProcAttributes.err_log in
  let pe = Pp.latex color in
  F.fprintf fmt "\\begin{verbatim}@\n" ;
  pp_summary_no_stats_specs fmt summary ;
  F.fprintf fmt "%a@\n" pp_errlog err_log ;
  F.fprintf fmt "%a@\n" pp_stats summary.stats ;
  F.fprintf fmt "\\end{verbatim}@\n" ;
  F.fprintf fmt "%a@\n" (pp_specs pe) (get_specs_from_payload summary)

let pp_summary_html source color fmt summary =
  let err_log = summary.attributes.ProcAttributes.err_log in
  let pe = Pp.html color in
  Io_infer.Html.pp_start_color fmt Black ;
  F.fprintf fmt "@\n%a" pp_summary_no_stats_specs summary ;
  Io_infer.Html.pp_end_color fmt () ;
  F.fprintf fmt "<br />%a<br />@\n" pp_stats summary.stats ;
  Errlog.pp_html source [] fmt err_log ;
  Io_infer.Html.pp_hline fmt () ;
  F.fprintf fmt "<LISTING>@\n" ;
  pp_payload pe fmt summary.payload ;
  F.fprintf fmt "</LISTING>@\n"

let empty_stats calls =
  { stats_failure= None
  ; symops= 0
  ; nodes_visited_fp= IntSet.empty
  ; nodes_visited_re= IntSet.empty
  ; call_stats= CallStats.init calls }

let payload_compact sh payload =
  match payload.preposts with
  | Some specs
   -> {payload with preposts= Some (List.map ~f:(NormSpec.compact sh) specs)}
  | None
   -> payload

(** Return a compact representation of the summary *)
let summary_compact sh summary = {summary with payload= payload_compact sh summary.payload}

(** Add the summary to the table for the given function *)
let add_summary (proc_name: Typ.Procname.t) (summary: summary) : unit =
  L.(debug Analysis Medium)
    "Adding summary for %a@\n@[<v 2>  %a@]@." Typ.Procname.pp proc_name pp_summary_text summary ;
  Typ.Procname.Hash.replace spec_tbl proc_name summary

let specs_filename pname =
  let pname_file = Typ.Procname.to_filename pname in
  pname_file ^ Config.specs_files_suffix

(** path to the .specs file for the given procedure in the current results directory *)
let res_dir_specs_filename pname =
  DB.Results_dir.path_to_filename DB.Results_dir.Abs_root
    [Config.specs_dir_name; specs_filename pname]

(** paths to the .specs file for the given procedure in the current spec libraries *)
let specs_library_filenames pname =
  List.map
    ~f:(fun specs_dir ->
      DB.filename_from_string (Filename.concat specs_dir (specs_filename pname)))
    Config.specs_library

(** paths to the .specs file for the given procedure in the models folder *)
let specs_models_filename pname =
  DB.filename_from_string (Filename.concat Config.models_dir (specs_filename pname))

let summary_exists_in_models pname =
  Sys.file_exists (DB.filename_to_string (specs_models_filename pname)) = `Yes

let summary_serializer : summary Serialization.serializer =
  Serialization.create_serializer Serialization.Key.summary

(** Load procedure summary from the given file *)
let load_summary specs_file = Serialization.read_from_file summary_serializer specs_file

(** Load procedure summary for the given procedure name and update spec table *)
let load_summary_to_spec_table proc_name =
  let add summ = add_summary proc_name summ ; true in
  let load_summary_models models_dir =
    match load_summary models_dir with None -> false | Some summ -> add summ
  in
  let rec load_summary_libs = function
    | (* try to load the summary from a list of libs *)
    []
     -> false
    | spec_path :: spec_paths ->
      match load_summary spec_path with
      | None
       -> load_summary_libs spec_paths
      | Some summ
       -> add summ
  in
  let load_summary_ziplibs zip_specs_filename =
    let zip_specs_path = Filename.concat Config.specs_dir_name zip_specs_filename in
    match ZipLib.load summary_serializer zip_specs_path with
    | None
     -> false
    | Some summary
     -> add summary
  in
  let default_spec_dir = res_dir_specs_filename proc_name in
  match load_summary default_spec_dir with
  | None
   -> (* search on models, libzips, and libs *)
      load_summary_models (specs_models_filename proc_name)
      || load_summary_ziplibs (specs_filename proc_name)
      || load_summary_libs (specs_library_filenames proc_name)
  | Some summ
   -> add summ

let rec get_summary proc_name =
  try Some (Typ.Procname.Hash.find spec_tbl proc_name)
  with Not_found -> if load_summary_to_spec_table proc_name then get_summary proc_name else None

let get_summary_unsafe s proc_name =
  match get_summary proc_name with
  | None
   -> L.(die InternalError)
        "[%s] Specs.get_summary_unsafe: %a Not found" s Typ.Procname.pp proc_name
  | Some summary
   -> summary

(** Check if the procedure is from a library:
    It's not defined, and there is no spec file for it. *)
let proc_is_library proc_attributes =
  if not proc_attributes.ProcAttributes.is_defined then
    match get_summary proc_attributes.ProcAttributes.proc_name with
    | None
     -> true
    | Some _
     -> false
  else false

(** Try to find the attributes for a defined proc.
    First look at specs (to get attributes computed by analysis)
    then look at the attributes table.
    If no attributes can be found, return None.
*)
let proc_resolve_attributes proc_name =
  let from_attributes_table () = AttributesTable.load_attributes ~cache:true proc_name in
  let from_specs () =
    match get_summary proc_name with Some summary -> Some summary.attributes | None -> None
  in
  match from_specs () with
  | Some attributes
   -> (
      if attributes.ProcAttributes.is_defined then Some attributes
      else
        match from_attributes_table () with
        | Some attributes'
         -> Some attributes'
        | None
         -> Some attributes )
  | None
   -> from_attributes_table ()

(** Like proc_resolve_attributes but start from a proc_desc. *)
let pdesc_resolve_attributes proc_desc =
  let proc_name = Procdesc.get_proc_name proc_desc in
  match proc_resolve_attributes proc_name with
  | Some proc_attributes
   -> proc_attributes
  | None
   -> (* this should not happen *)
      assert false

let summary_exists proc_name = match get_summary proc_name with Some _ -> true | None -> false

let get_status summary = summary.status

let get_proc_name summary = summary.attributes.ProcAttributes.proc_name

let get_ret_type summary = summary.attributes.ProcAttributes.ret_type

let get_formals summary = summary.attributes.ProcAttributes.formals

let get_attributes summary = summary.attributes

(** Return the current phase for the proc *)
let get_phase summary = summary.phase

(** Save summary for the procedure into the spec database *)
let store_summary (summ1: summary) =
  let summ2 =
    if Config.save_compact_summaries then summary_compact (Sil.create_sharing_env ()) summ1
    else summ1
  in
  let final_summary = {summ2 with status= Analyzed} in
  let proc_name = get_proc_name final_summary in
  (* Make sure the summary in memory is identical to the saved one *)
  add_summary proc_name final_summary ;
  Serialization.write_to_file summary_serializer (res_dir_specs_filename proc_name)
    ~data:final_summary

let empty_payload =
  { preposts= None
  ; typestate= None
  ; annot_map= None
  ; crashcontext_frame= None
  ; quandary= None
  ; resources= None
  ; siof= None
  ; threadsafety= None
  ; buffer_overrun= None }

(** [init_summary (depend_list, nodes,
    proc_flags, calls, in_out_calls_opt, proc_attributes)]
    initializes the summary for [proc_name] given dependent procs in list [depend_list]. *)
let init_summary (nodes, proc_flags, calls, proc_attributes, proc_desc_option) =
  let summary =
    { nodes
    ; phase= FOOTPRINT
    ; sessions= ref 0
    ; payload= empty_payload
    ; stats= empty_stats calls
    ; status= Pending
    ; attributes= {proc_attributes with ProcAttributes.proc_flags= proc_flags}
    ; proc_desc_option }
  in
  Typ.Procname.Hash.replace spec_tbl proc_attributes.ProcAttributes.proc_name summary ; summary

let dummy =
  init_summary
    ( []
    , ProcAttributes.proc_flags_empty ()
    , []
    , ProcAttributes.default Typ.Procname.empty_block Config.Java
    , None )

(** Reset a summary rebuilding the dependents and preserving the proc attributes if present. *)
let reset_summary proc_desc =
  let proc_desc_option = if Config.dynamic_dispatch = `Lazy then Some proc_desc else None in
  init_summary
    ( []
    , ProcAttributes.proc_flags_empty ()
    , []
    , Procdesc.get_attributes proc_desc
    , proc_desc_option )

(* =============== END of support for spec tables =============== *)
(*
let rec post_equal pl1 pl2 = match pl1, pl2 with
  | [],[] -> true
  | [], _:: _ -> false
  | _:: _,[] -> false
  | p1:: pl1', p2:: pl2' ->
      if Prop.equal_prop p1 p2 then post_equal pl1' pl2'
      else false
*)