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(* TEST_BELOW
(* Blank lines added here to preserve locations. *)
*)
(* A test for stack backtraces *)
external get_backtrace : unit -> Printexc.backtrace_slot array option
= "caml_get_exception_backtrace"
exception Error of string
let rec f msg n =
if n = 0 then raise(Error msg) else 1 + f msg (n-1)
let g msg =
try
f msg 5
with Error "a" -> print_string "a"; print_newline(); 0
| Error "b" as exn -> print_string "b"; print_newline(); raise exn
| Error "c" -> raise (Error "c")
let run args =
try
ignore (g args.(0)); print_string "No exception\n"
with exn ->
Printf.printf "Uncaught exception %s\n" (Printexc.to_string exn);
get_backtrace () |> function
| None -> ()
| Some trace ->
Array.iteri
(fun i slot -> match Printexc.Slot.format i slot with
| None -> ()
| Some line -> print_endline line)
trace
let _ =
run [| "a" |];
run [| "b" |];
run [| "c" |];
run [| "d" |];
run [| |]
(* TEST
flags = "-g";
ocamlrunparam += ",b=1";
*)
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