Source file kernel_ast.ml
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open Data
module Md = Markdown
module Js = Yojson.Basic.Util
module Pkg = Package
open Cil_types
let package = Pkg.package ~title:"Ast Services" ~name:"ast" ~readme:"ast.md" ()
let () = Request.register ~package
~kind:`EXEC ~name:"compute"
~descr:(Md.plain "Ensures that AST is computed")
~input:(module Junit) ~output:(module Junit) Ast.compute
let changed_signal = Request.signal ~package ~name:"changed"
~descr:(Md.plain "Emitted when the AST has been changed")
let ast_changed () = Request.emit changed_signal
let ast_update_hook f =
begin
Ast.add_hook_on_update f;
Ast.apply_after_computed (fun _ -> f ());
end
let () = ast_update_hook ast_changed
let () = Annotations.add_hook_on_change ast_changed
module Position =
struct
type t = Filepath.position
let jtype = Data.declare ~package ~name:"source"
~descr:(Md.plain "Source file positions.")
(Jrecord [
"dir", Jstring;
"base", Jstring;
"file", Jstring;
"line", Jnumber;
])
let to_json p =
let path = Filepath.(Normalized.to_pretty_string p.pos_path) in
let file =
if Server_parameters.has_relative_filepath ()
then path
else (p.Filepath.pos_path :> string)
in
`Assoc [
"dir" , `String (Filename.dirname path) ;
"base" , `String (Filename.basename path) ;
"file" , `String file ;
"line" , `Int p.Filepath.pos_lnum ;
]
let of_json js =
let fail () = failure_from_type_error "Invalid source format" js in
match js with
| `Assoc assoc ->
begin
match List.assoc "file" assoc, List.assoc "line" assoc with
| `String path, `Int line ->
Log.source ~file:(Filepath.Normalized.of_string path) ~line
| _, _ -> fail ()
| exception Not_found -> fail ()
end
| _ -> fail ()
end
let jFunction = Data.declare ~package ~name:"fct"
~descr:(Md.plain "Function names")
(Pkg.Jkey "fct")
module Function =
struct
type t = kernel_function
let jtype = jFunction
let to_json kf =
`String (Kernel_function.get_name kf)
let of_json js =
let fn = Js.to_string js in
try Globals.Functions.find_by_name fn
with Not_found -> Data.failure "Undefined function '%s'" fn
end
module Fundec =
struct
type t = fundec
let jtype = jFunction
let to_json fundec =
`String fundec.svar.vname
let of_json js =
let fn = Js.to_string js in
try Kernel_function.get_definition (Globals.Functions.find_by_name fn)
with Not_found | Kernel_function.No_Definition ->
Data.failure "Undefined function definition '%s'" fn
end
module Marker =
struct
open Printer_tag
type index = {
tags : string Localizable.Hashtbl.t ;
locs : (string,localizable) Hashtbl.t ;
}
let kid = ref 0
let index () = {
tags = Localizable.Hashtbl.create 0 ;
locs = Hashtbl.create 0 ;
}
module TYPE : Datatype.S with type t = index =
Datatype.Make
(struct
type t = index
include Datatype.Undefined
let reprs = [index()]
let name = "Server.Jprinter.Index"
let mem_project = Datatype.never_any_project
end)
module STATE = State_builder.Ref(TYPE)
(struct
let name = "Server.Jprinter.State"
let dependencies = []
let default = index
end)
let iter f =
Localizable.Hashtbl.iter (fun key str -> f (key, str)) (STATE.get ()).tags
let create_tag = function
| PStmt(_,s) -> Printf.sprintf "#s%d" s.sid
| PStmtStart(_,s) -> Printf.sprintf "#k%d" s.sid
| PVDecl(_,_,v) -> Printf.sprintf "#v%d" v.vid
| PLval _ -> Printf.sprintf "#l%d" (incr kid ; !kid)
| PExp(_,_,e) -> Printf.sprintf "#e%d" e.eid
| PTermLval _ -> Printf.sprintf "#t%d" (incr kid ; !kid)
| PGlobal _ -> Printf.sprintf "#g%d" (incr kid ; !kid)
| PIP _ -> Printf.sprintf "#p%d" (incr kid ; !kid)
| PType _ -> Printf.sprintf "#y%d" (incr kid ; !kid)
let hooks = ref []
let hook f = hooks := !hooks @ [f]
let tag loc =
let { tags ; locs } = STATE.get () in
try Localizable.Hashtbl.find tags loc
with Not_found ->
let tag = create_tag loc in
Localizable.Hashtbl.add tags loc tag ;
Hashtbl.add locs tag loc ;
List.iter (fun fn -> fn (loc,tag)) !hooks ; tag
let find tag = Hashtbl.find (STATE.get()).locs tag
type t = localizable
let jtype = Data.declare ~package ~name:"marker"
~descr:(Md.plain "Localizable AST markers")
(Pkg.Jkey "marker")
let to_json loc = `String (tag loc)
let of_json js =
try find (Js.to_string js)
with Not_found ->
Data.failure "invalid marker (%a)" Json.pp_dump js
end
module Printer = Printer_tag.Make(Marker)
module Lval =
struct
open Printer_tag
type t = kinstr * lval
let jtype = Marker.jtype
let to_json (kinstr, lval) =
let kf = match kinstr with
| Kglobal -> None
| Kstmt stmt -> Some (Kernel_function.find_englobing_kf stmt)
in
Marker.to_json (PLval (kf, kinstr, lval))
let find = function
| PLval (_, kinstr, lval) -> kinstr, lval
| PVDecl (_, kinstr, vi) -> kinstr, Cil.var vi
| PGlobal (GVar (vi, _, _) | GVarDecl (vi, _)) -> Kglobal, Cil.var vi
| _ -> raise Not_found
let mem tag = try let _ = find tag in true with Not_found -> false
let of_json js =
try find (Marker.of_json js)
with Not_found -> Data.failure "not a lval marker"
end
module Stmt =
struct
type t = stmt
let jtype = Marker.jtype
let to_json st =
let kf = Kernel_function.find_englobing_kf st in
Marker.to_json (PStmtStart(kf,st))
let of_json js =
let open Printer_tag in
match Marker.of_json js with
| PStmt(_,st) | PStmtStart(_,st) -> st
| _ -> Data.failure "not a stmt marker"
end
module Kinstr =
struct
type t = kinstr
let jtype = Pkg.Joption Marker.jtype
let to_json = function
| Kglobal -> `Null
| Kstmt st -> Stmt.to_json st
let of_json = function
| `Null -> Kglobal
| js -> Kstmt (Stmt.of_json js)
end
module Location =
struct
type t = Function.t * Marker.t
let jtype = Data.declare
~package ~name:"location"
~descr:(Md.plain "Location: function and marker")
(Jrecord ["fct", Function.jtype; "marker", Marker.jtype])
let to_json (kf, loc) = `Assoc [
"fct", Function.to_json kf ;
"marker", Marker.to_json loc ;
]
let of_json js =
Json.field "fct" js |> Function.of_json,
Json.field "marker" js |> Marker.of_json
end
module Attributes =
struct
open Printer_tag
let descr ~short m =
match varinfo_of_localizable m with
| Some vi ->
if Globals.Functions.mem vi then "Function" else
if vi.vglob then
if short then "Global" else "Global Variable"
else if vi.vformal then
if short then "Formal" else "Formal Parameter"
else if vi.vtemp then
if short then "Temp" else "Temporary Variable (generated)"
else
if short then "Local" else "Local Variable"
| None ->
match m with
| PStmt _ | PStmtStart _ -> if short then "Stmt" else "Statement"
| PLval _ -> if short then "Lval" else "L-value"
| PTermLval _ -> if short then "Lval" else "ACSL L-value"
| PVDecl _ -> assert false
| PExp _ -> if short then "Expr" else "Expression"
| PIP _ -> if short then "Prop" else "Property"
| PGlobal _ -> if short then "Decl" else "Declaration"
| PType _ -> "Type"
let is_function tag =
match varinfo_of_localizable tag with
| Some vi -> Globals.Functions.mem vi
| None -> false
let is_function_pointer = function
| PLval (_, _, (Mem _, NoOffset as lval))
when Cil.(isFunctionType (typeOfLval lval)) -> true
| PLval (_, _, lval)
when Cil.(isFunPtrType (Cil.typeOfLval lval)) -> true
| _ -> false
let is_fundecl = function
| PVDecl(Some _,Kglobal,vi) -> vi.vglob && Globals.Functions.mem vi
| _ -> false
let scope tag =
Option.map Kernel_function.get_name @@ Printer_tag.kf_of_localizable tag
let model = States.model ()
let () =
States.column
~name:"labelKind"
~descr:(Md.plain "Marker kind (short)")
~data:(module Jalpha)
~get:(fun (tag,_) -> descr ~short:true tag)
model
let () =
States.column
~name:"titleKind"
~descr:(Md.plain "Marker kind (long)")
~data:(module Jalpha)
~get:(fun (tag,_) -> descr ~short:false tag)
model
let () =
States.column
~name:"name"
~descr:(Md.plain "Marker short name or identifier when relevant.")
~data:(module Jalpha)
~get:(fun (tag, _) -> Printer_tag.label tag)
model
let () =
States.column
~name:"descr"
~descr:(Md.plain "Marker declaration or description")
~data:(module Jstring)
~get:(fun (tag, _) -> Rich_text.to_string Printer_tag.pretty tag)
model
let () =
States.column
~name:"isLval"
~descr:(Md.plain "Whether it is an l-value")
~data:(module Jbool)
~get:(fun (tag, _) -> Lval.mem tag)
model
let () =
States.column
~name:"isFunction"
~descr:(Md.plain "Whether it is a function symbol")
~data:(module Jbool)
~get:(fun (tag, _) -> is_function tag)
model
let () =
States.column
~name:"isFunctionPointer"
~descr:(Md.plain "Whether it is a function pointer")
~data:(module Jbool)
~get:(fun (tag, _) -> is_function_pointer tag)
model
let () =
States.column
~name:"isFunDecl"
~descr:(Md.plain "Whether it is a function declaration")
~data:(module Jbool)
~get:(fun (tag, _) -> is_fundecl tag)
model
let () =
States.option
~name:"scope"
~descr:(Md.plain "Function scope of the marker, if applicable")
~data:(module Jstring)
~get:(fun (tag, _) -> scope tag)
model
let () =
let get (tag, _) =
let pos = fst (Printer_tag.loc_of_localizable tag) in
if Cil_datatype.Position.(equal unknown pos) then None else Some pos
in
States.option
~name:"sloc"
~descr:(Md.plain "Source location")
~data:(module Position)
~get
model
let array = States.register_array
~package
~name:"markerAttributes"
~descr:(Md.plain "Marker attributes")
~key:snd
~keyName:"marker"
~keyType:Marker.jtype
~iter:Marker.iter
~add_reload_hook:ast_update_hook
model
let () = Marker.hook (States.update array)
end
let () = Request.register ~package
~kind:`GET ~name:"getMainFunction"
~descr:(Md.plain "Get the current 'main' function.")
~input:(module Junit) ~output:(module Joption(Function))
begin fun () ->
try Some (fst (Globals.entry_point ()))
with Globals.No_such_entry_point _ -> None
end
let () = Request.register ~package
~kind:`GET ~name:"getFunctions"
~descr:(Md.plain "Collect all functions in the AST")
~input:(module Junit) ~output:(module Jlist(Function))
begin fun () ->
let pool = ref [] in
Globals.Functions.iter (fun kf -> pool := kf :: !pool) ;
List.rev !pool
end
let () = Request.register ~package
~kind:`GET ~name:"printFunction"
~descr:(Md.plain "Print the AST of a function")
~signals:[changed_signal]
~input:(module Function) ~output:(module Jtext)
begin fun kf ->
let libc = Kernel.PrintLibc.get () in
try
if not libc then Kernel.PrintLibc.set true ;
let global = Kernel_function.get_global kf in
let pp_glb = Printer.(with_unfold_precond (fun _ -> true) pp_global) in
let ast = Jbuffer.to_json pp_glb global in
if not libc then Kernel.PrintLibc.set false ; ast
with err ->
if not libc then Kernel.PrintLibc.set false ; raise err
end
module Functions =
struct
let key kf = Printf.sprintf "kf#%d" (Kernel_function.get_id kf)
let signature kf =
let global = Kernel_function.get_global kf in
let libc = Kernel.PrintLibc.get () in
try
if not libc then Kernel.PrintLibc.set true ;
let txt = Rich_text.to_string Printer_tag.pretty (PGlobal global) in
if not libc then Kernel.PrintLibc.set false ;
if Kernel_function.is_entry_point kf then (txt ^ " /* main */") else txt
with err ->
if not libc then Kernel.PrintLibc.set false ; raise err
let is_builtin kf =
Cil_builtins.is_builtin (Kernel_function.get_vi kf)
let is_extern kf =
let vi = Kernel_function.get_vi kf in
vi.vstorage = Extern
let iter f =
Globals.Functions.iter
(fun kf ->
let name = Kernel_function.get_name kf in
if not (Ast_info.is_frama_c_builtin name) then f kf)
let array : kernel_function States.array =
begin
let model = States.model () in
States.column model
~name:"name"
~descr:(Md.plain "Name")
~data:(module Data.Jalpha)
~get:Kernel_function.get_name ;
States.column model
~name:"signature"
~descr:(Md.plain "Signature")
~data:(module Data.Jstring)
~get:signature ;
States.column model
~name:"main"
~descr:(Md.plain "Is the function the main entry point")
~data:(module Data.Jbool)
~default:false
~get:Kernel_function.is_entry_point;
States.column model
~name:"defined"
~descr:(Md.plain "Is the function defined?")
~data:(module Data.Jbool)
~default:false
~get:Kernel_function.is_definition;
States.column model
~name:"stdlib"
~descr:(Md.plain "Is the function from the Frama-C stdlib?")
~data:(module Data.Jbool)
~default:false
~get:Kernel_function.is_in_libc;
States.column model
~name:"builtin"
~descr:(Md.plain "Is the function a Frama-C builtin?")
~data:(module Data.Jbool)
~default:false
~get:is_builtin;
States.column model
~name:"extern"
~descr:(Md.plain "Is the function extern?")
~data:(module Data.Jbool)
~default:false
~get:is_extern;
States.column model
~name:"sloc"
~descr:(Md.plain "Source location")
~data:(module Position)
~get:(fun kf -> fst (Kernel_function.get_location kf));
States.register_array model
~package ~key
~name:"functions"
~descr:(Md.plain "AST Functions")
~iter
~add_reload_hook:ast_update_hook
end
end
module Information =
struct
type info = {
id: string;
rank: int;
label: string;
title: string;
descr: string;
enable: unit -> bool;
pretty: Format.formatter -> Printer_tag.localizable -> unit
}
module S =
struct
type t = (info * Jtext.t)
let jtype = Package.(Jrecord[
"id", Jstring ;
"label", Jstring ;
"title", Jstring ;
"descr", Jstring ;
"text", Jtext.jtype ;
])
let of_json _ = failwith "Information.Info"
let to_json (info,text) = `Assoc [
"id", `String info.id ;
"label", `String info.label ;
"title", `String info.title ;
"descr", `String info.descr ;
"text", text ;
]
end
let rankId = ref 0
let registry : (string,info) Hashtbl.t = Hashtbl.create 0
let jtext pp marker =
try
let buffer = Jbuffer.create () in
let fmt = Jbuffer.formatter buffer in
pp fmt marker;
Format.pp_print_flush fmt ();
Jbuffer.contents buffer
with Not_found ->
`Null
let rank ({rank},_) = rank
let by_rank a b = Stdlib.compare (rank a) (rank b)
let get_information tgt =
let infos = ref [] in
Hashtbl.iter
(fun _ info ->
if info.enable () then
match tgt with
| None -> infos := (info, `Null) :: !infos
| Some marker ->
let text = jtext info.pretty marker in
if not (Jbuffer.is_empty text) then
infos := (info, text) :: !infos
) registry ;
List.sort by_rank !infos
let signal = Request.signal ~package
~name:"getInformationUpdate"
~descr:(Md.plain "Updated AST information")
let update () = Request.emit signal
let register ~id ~label ~title
?(descr = title)
?(enable = fun _ -> true)
pretty =
let rank = incr rankId ; !rankId in
let info = { id ; rank ; label ; title ; descr; enable ; pretty } in
if Hashtbl.mem registry id then
( let msg = Format.sprintf
"Server.Kernel_ast.register_info: duplicate %S" id in
raise (Invalid_argument msg) );
Hashtbl.add registry id info
end
let () = Request.register ~package
~kind:`GET ~name:"getInformation"
~descr:(Md.plain
"Get available information about markers. \
When no marker is given, returns all kinds \
of information (with empty `descr` field).")
~input:(module Joption(Marker))
~output:(module Jlist(Information.S))
~signals:[Information.signal]
Information.get_information
let () = Information.register
~id:"kernel.ast.location"
~label:"Location"
~title:"Source file location"
begin fun fmt loc ->
let pos = fst @@ Printer_tag.loc_of_localizable loc in
if Filepath.Normalized.is_empty pos.pos_path then
raise Not_found ;
Filepath.pp_pos fmt pos
end
let () = Information.register
~id:"kernel.ast.varinfo"
~label:"Var"
~title:"Variable Information"
begin fun fmt loc ->
match loc with
| PLval (_ , _, (Var x,NoOffset)) | PVDecl(_,_,x) ->
if not x.vreferenced then Format.pp_print_string fmt "unused " ;
begin
match x.vstorage with
| NoStorage -> ()
| Extern -> Format.pp_print_string fmt "extern "
| Static -> Format.pp_print_string fmt "static "
| Register -> Format.pp_print_string fmt "register "
end ;
if x.vghost then Format.pp_print_string fmt "ghost " ;
if x.vaddrof then Format.pp_print_string fmt "aliased " ;
if x.vformal then Format.pp_print_string fmt "formal" else
if x.vglob then Format.pp_print_string fmt "global" else
if x.vtemp then Format.pp_print_string fmt "temporary" else
Format.pp_print_string fmt "local" ;
| _ -> raise Not_found
end
let () = Information.register
~id:"kernel.ast.typeinfo"
~label:"Type"
~title:"Type of C/ASCL expression"
begin fun fmt loc ->
let open Printer in
match loc with
| PExp (_, _, e) -> pp_typ fmt (Cil.typeOf e)
| PLval (_, _, lval) -> pp_typ fmt (Cil.typeOfLval lval)
| PTermLval(_,_,_,lv) -> pp_logic_type fmt (Cil.typeOfTermLval lv)
| PVDecl (_,_,vi) -> pp_typ fmt vi.vtype
| _ -> raise Not_found
end
let () = Information.register
~id:"kernel.ast.typedef"
~label:"Typedef"
~title:"Type Definition"
begin fun fmt loc ->
match loc with
| PGlobal
(( GType _
| GCompTag _ | GCompTagDecl _
| GEnumTag _ | GEnumTagDecl _
) as g) -> Printer.pp_global fmt g
| _ -> raise Not_found
end
let () = Information.register
~id:"kernel.ast.typesizeof"
~label:"Sizeof"
~title:"Size of a C-type or C-variable"
begin fun fmt loc ->
let typ =
match loc with
| PType typ -> typ
| PVDecl(_,_,vi) -> vi.vtype
| PGlobal (GType(ti,_)) -> ti.ttype
| PGlobal (GCompTagDecl(ci,_) | GCompTag(ci,_)) -> TComp(ci,[])
| PGlobal (GEnumTagDecl(ei,_) | GEnumTag(ei,_)) -> TEnum(ei,[])
| _ -> raise Not_found
in
let bits =
try Cil.bitsSizeOf typ
with Cil.SizeOfError _ -> raise Not_found
in
let bytes = bits / 8 in
let rbits = bits mod 8 in
if rbits > 0 then
if bytes > 0 then
Format.fprintf fmt "%d bytes + %d bits" bytes rbits
else
Format.fprintf fmt "%d bits" rbits
else
Format.fprintf fmt "%d bytes" bytes
end
let () = Information.register
~id:"kernel.ast.marker"
~label:"Marker"
~title:"Ivette marker (for debugging)"
~enable:(fun _ -> Server_parameters.debug_atleast 1)
begin fun fmt loc ->
let tag = Marker.create_tag loc in
Format.fprintf fmt "%S" tag
end
let () = Server_parameters.Debug.add_hook_on_update
(fun _ -> Information.update ())
let get_kf_marker (file, line, col) =
let pos_path = Filepath.Normalized.of_string file in
let pos =
Filepath.{ pos_path; pos_lnum = line; pos_cnum = col; pos_bol = 0; }
in
let tag = Printer_tag.loc_to_localizable ~precise_col:true pos in
let kf = Option.bind tag Printer_tag.kf_of_localizable in
kf, tag
let () =
let descr =
Md.plain
"Returns the marker and function at a source file position, if any. \
Input: file path, line and column."
in
Request.register
~package ~descr ~kind:`GET ~name:"getMarkerAt"
~input:(module Jtriple (Jstring) (Jint) (Jint))
~output:(module Jpair (Joption (Function)) (Joption (Marker)))
get_kf_marker
let get_files () =
let files = Kernel.Files.get () in
List.map (fun f -> (f:Filepath.Normalized.t:>string)) files
let () =
Request.register
~package
~descr:(Md.plain "Get the currently analyzed source file names")
~kind:`GET
~name:"getFiles"
~input:(module Junit) ~output:(module Jlist(Jstring))
get_files
let set_files files =
let s = String.concat "," files in
Kernel.Files.As_string.set s
let () =
Request.register
~package
~descr:(Md.plain "Set the source file names to analyze.")
~kind:`SET
~name:"setFiles"
~input:(module Jlist(Jstring))
~output:(module Junit)
set_files
let build_marker ~stmt ~term =
let env =
let open Logic_typing in
Lenv.empty () |> append_pre_label |> append_init_label |> append_here_label
in
try
let kf = Kernel_function.find_englobing_kf stmt in
let term = Logic_parse_string.term ~env kf term in
let exp = Logic_to_c.term_to_exp term in
Some (Printer_tag.PExp (Some kf, Kstmt stmt, exp))
with Not_found
| Logic_parse_string.Error _
| Logic_parse_string.Unbound _
| Logic_to_c.No_conversion -> None
let () =
let module Md = Markdown in
let s = Request.signature ~output:(module Marker) () in
let get_marker = Request.param s ~name:"stmt"
~descr:(Md.plain "Marker position from where to localize the term")
(module Marker) in
let get_term = Request.param s ~name:"term"
~descr:(Md.plain "ACSL term to parse")
(module Data.Jstring) in
Request.register_sig ~package s
~kind:`GET ~name:"parseExpr"
~descr:(Md.plain "Parse a C expression and returns the associated marker")
begin fun rq () ->
match Printer_tag.ki_of_localizable @@ get_marker rq with
| Kglobal -> Data.failure "No statement at selection point"
| Kstmt stmt ->
match build_marker ~stmt ~term:(get_term rq) with
| None -> Data.failure "Invalid expression"
| Some tag -> tag
end