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
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
|
(***********************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA-Rocquencourt & LRI-CNRS-Orsay *)
(* \VV/ *************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(***********************************************************************)
open Pp
(** Aliases *)
let push = Backtrace.add_backtrace
(* Errors *)
exception Anomaly of string option * std_ppcmds (* System errors *)
let make_anomaly ?label pp =
Anomaly (label, pp)
let anomaly_gen label pp =
raise (Anomaly (label, pp))
let anomaly ?loc ?label pp =
match loc with
| None -> raise (Anomaly (label, pp))
| Some loc ->
Loc.raise loc (Anomaly (label, pp))
let anomalylabstrm string pps =
anomaly_gen (Some string) pps
let is_anomaly = function
| Anomaly _ -> true
| _ -> false
exception UserError of string * std_ppcmds (* User errors *)
let error string = raise (UserError("_", str string))
let errorlabstrm l pps = raise (UserError(l,pps))
exception AlreadyDeclared of std_ppcmds (* for already declared Schemes *)
let alreadydeclared pps = raise (AlreadyDeclared(pps))
let todo s = prerr_string ("TODO: "^s^"\n")
let user_err_loc (loc,s,strm) = Loc.raise loc (UserError (s,strm))
let invalid_arg_loc (loc,s) = Loc.raise loc (Invalid_argument s)
(* Like Exc_located, but specifies the outermost file read, the filename
associated to the location of the error, and the error itself. *)
exception Error_in_file of string * (bool * string * Loc.t) * exn
exception Timeout
exception Drop
exception Quit
let handle_stack = ref []
exception Unhandled
let register_handler h = handle_stack := h::!handle_stack
(** [print_gen] is a general exception printer which tries successively
all the handlers of a list, and finally a [bottom] handler if all
others have failed *)
let rec print_gen bottom stk e =
match stk with
| [] -> bottom e
| h::stk' ->
try h e
with
| Unhandled -> print_gen bottom stk' e
| any -> print_gen bottom stk' any
(** Only anomalies should reach the bottom of the handler stack.
In usual situation, the [handle_stack] is treated as it if was always
non-empty with [print_anomaly] as its bottom handler. *)
let where = function
| None -> mt ()
| Some s ->
if !Flags.debug then str ("in "^s^":") ++ spc () else mt ()
let raw_anomaly e = match e with
| Anomaly (s, pps) -> where s ++ pps ++ str "."
| Assert_failure _ | Match_failure _ -> str (Printexc.to_string e ^ ".")
| _ -> str ("Uncaught exception " ^ Printexc.to_string e ^ ".")
let print_anomaly askreport e =
let bt_info = match Backtrace.get_backtrace e with
| None -> mt ()
| Some bt ->
let pr_frame f = str (Backtrace.print_frame f) in
let bt = prlist_with_sep fnl pr_frame bt in
fnl () ++ hov 0 bt
in
let info =
if askreport then
hov 0 (str "Anomaly: " ++ raw_anomaly e ++ spc () ++ str "Please report.")
else
hov 0 (raw_anomaly e)
in
info ++ bt_info
(** The standard exception printer *)
let print e = print_gen (print_anomaly true) !handle_stack e
(** Same as [print], except that the "Please report" part of an anomaly
isn't printed (used in Ltac debugging). *)
let print_no_report e = print_gen (print_anomaly false) !handle_stack e
let print_anomaly e = print_anomaly true e
(** Same as [print], except that anomalies are not printed but re-raised
(used for the Fail command) *)
let print_no_anomaly e = print_gen (fun e -> raise e) !handle_stack e
(** Predefined handlers **)
let _ = register_handler begin function
| UserError(s,pps) -> hov 0 (str "Error: " ++ where (Some s) ++ pps)
| _ -> raise Unhandled
end
(** Critical exceptions shouldn't be catched and ignored by mistake
by inner functions during a [vernacinterp]. They should be handled
only at the very end of interp, to be displayed to the user. *)
let noncritical = function
| Sys.Break | Out_of_memory | Stack_overflow
| Assert_failure _ | Match_failure _ | Anomaly _
| Timeout | Drop | Quit -> false
| _ -> true
|
