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(* Open Source License                                                       *)
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type task =
  | Create_engine
  | Create_store
  | Create_configuration
  | Create_module
  | Instantiate_module

let string_of_task = function
  | Create_engine -> "creating a Wasmer engine"
  | Create_store -> "creating a WebAssembly store"
  | Create_configuration -> "creating a Wasmer configuration"
  | Create_module -> "creating a WebAssembly module"
  | Instantiate_module -> "instantiating a WebAssembly module"

type t = {task : task; reason : string}

exception Wasmer_error of t

let make_exception task reason = Wasmer_error {task; reason}

let () =
  Printexc.register_printer @@ function
  | Wasmer_error {task; reason} ->
      Some
        (Format.asprintf
           "Wasmer errored while %s: %s"
           (string_of_task task)
           reason)
  | _ -> None