support bulk messages consisting of small string segments, which are more healthy to the Poly/ML RTS and might prevent spurious GC crashes such as MTGCProcessMarkPointers::ScanAddressesInObject;
(* Title: Pure/System/isabelle_process.ML
Author: Makarius
Isabelle process wrapper, based on private fifos for maximum
robustness and performance, or local socket for maximum portability.
*)
signature ISABELLE_PROCESS =
sig
val is_active: unit -> bool
val protocol_command: string -> (string list -> unit) -> unit
val reset_tracing: Document_ID.exec -> unit
val crashes: exn list Synchronized.var
val init_fifos: string -> string -> unit
val init_socket: string -> unit
end;
structure Isabelle_Process: ISABELLE_PROCESS =
struct
(* print mode *)
val isabelle_processN = "isabelle_process";
fun is_active () = Print_Mode.print_mode_active isabelle_processN;
val _ = Output.add_mode isabelle_processN Output.default_output Output.default_escape;
val _ = Markup.add_mode isabelle_processN YXML.output_markup;
(* protocol commands *)
local
val commands =
Synchronized.var "Isabelle_Process.commands"
(Symtab.empty: (string list -> unit) Symtab.table);
in
fun protocol_command name cmd =
Synchronized.change commands (fn cmds =>
(if not (Symtab.defined cmds name) then ()
else warning ("Redefining Isabelle protocol command " ^ quote name);
Symtab.update (name, cmd) cmds));
fun run_command name args =
(case Symtab.lookup (Synchronized.value commands) name of
NONE => error ("Undefined Isabelle protocol command " ^ quote name)
| SOME cmd =>
(Runtime.debugging NONE cmd args handle exn =>
error ("Isabelle protocol command failure: " ^ quote name ^ "\n" ^
Runtime.exn_message exn)));
end;
(* restricted tracing messages *)
val tracing_messages =
Synchronized.var "tracing_messages" (Inttab.empty: int Inttab.table);
fun reset_tracing exec_id =
Synchronized.change tracing_messages (Inttab.delete_safe exec_id);
fun update_tracing () =
(case Position.parse_id (Position.thread_data ()) of
NONE => ()
| SOME exec_id =>
let
val ok =
Synchronized.change_result tracing_messages (fn tab =>
let
val n = the_default 0 (Inttab.lookup tab exec_id) + 1;
val ok = n <= Options.default_int "editor_tracing_messages";
in (ok, Inttab.update (exec_id, n) tab) end);
in
if ok then ()
else
let
val (text, promise) = Active.dialog_text ();
val _ =
writeln ("Tracing paused. " ^ text "Stop" ^ ", or continue with next " ^
text "100" ^ ", " ^ text "1000" ^ ", " ^ text "10000" ^ " messages?")
val m = Markup.parse_int (Future.join promise)
handle Fail _ => error "Stopped";
in
Synchronized.change tracing_messages
(Inttab.map_default (exec_id, 0) (fn k => k - m))
end
end);
(* output channels *)
val serial_props = Markup.serial_properties o serial;
fun init_channels channel =
let
val _ = TextIO.StreamIO.setBufferMode (TextIO.getOutstream TextIO.stdOut, IO.LINE_BUF);
val _ = TextIO.StreamIO.setBufferMode (TextIO.getOutstream TextIO.stdErr, IO.LINE_BUF);
val msg_channel = Message_Channel.make channel;
fun message name props body =
Message_Channel.send msg_channel (Message_Channel.message name props body);
fun standard_message props name body =
if forall (fn s => s = "") body then ()
else
message name
(fold_rev Properties.put props (Position.properties_of (Position.thread_data ()))) body;
in
Output.status_fn := standard_message [] Markup.statusN;
Output.report_fn := standard_message [] Markup.reportN;
Output.result_fn :=
(fn props => fn s => standard_message (props @ serial_props ()) Markup.resultN s);
Output.writeln_fn := (fn s => standard_message (serial_props ()) Markup.writelnN s);
Output.tracing_fn :=
(fn s => (update_tracing (); standard_message (serial_props ()) Markup.tracingN s));
Output.warning_fn := (fn s => standard_message (serial_props ()) Markup.warningN s);
Output.error_message_fn :=
(fn (i, s) => standard_message (Markup.serial_properties i) Markup.errorN s);
Output.protocol_message_fn := message Markup.protocolN;
Output.urgent_message_fn := ! Output.writeln_fn;
Output.prompt_fn := ignore;
message Markup.initN [] [Session.welcome ()];
msg_channel
end;
(* protocol loop -- uninterruptible *)
val crashes = Synchronized.var "Isabelle_Process.crashes" ([]: exn list);
local
fun recover crash =
(Synchronized.change crashes (cons crash);
warning "Recovering from Isabelle process crash -- see also Isabelle_Process.crashes");
fun read_chunk channel len =
let
val n =
(case Int.fromString len of
SOME n => n
| NONE => error ("Isabelle process: malformed header " ^ quote len));
val chunk = System_Channel.inputN channel n;
val i = size chunk;
in
if i <> n then
error ("Isabelle process: bad chunk (unexpected EOF after " ^
string_of_int i ^ " of " ^ string_of_int n ^ " bytes)")
else chunk
end;
fun read_command channel =
(case System_Channel.input_line channel of
NONE => raise Runtime.TERMINATE
| SOME line => map (read_chunk channel) (space_explode "," line));
fun task_context e =
Future.task_context "Isabelle_Process.loop" (Future.new_group NONE) e ();
in
fun loop channel =
let val continue =
(case read_command channel of
[] => (Output.error_message "Isabelle process: no input"; true)
| name :: args => (task_context (fn () => run_command name args); true))
handle Runtime.TERMINATE => false
| exn => (Runtime.exn_error_message exn handle crash => recover crash; true);
in
if continue then loop channel
else (Future.shutdown (); Execution.reset (); ())
end;
end;
(* init *)
val default_modes1 =
[Syntax_Trans.no_bracketsN, Syntax_Trans.no_type_bracketsN, Graph_Display.active_graphN];
val default_modes2 = [Symbol.xsymbolsN, isabelle_processN, Pretty.symbolicN];
val init = uninterruptible (fn _ => fn rendezvous =>
let
val _ = SHA1_Samples.test ()
handle exn as Fail msg => (Output.physical_stderr (msg ^ "\n"); reraise exn);
val _ = Output.physical_stderr Symbol.STX;
val _ = Printer.show_markup_default := true;
val _ = Context.set_thread_data NONE;
val _ =
Unsynchronized.change print_mode
(fn mode => (mode @ default_modes1) |> fold (update op =) default_modes2);
val channel = rendezvous ();
val msg_channel = init_channels channel;
val _ = Session.init_protocol_handlers ();
val _ = loop channel;
in Message_Channel.shutdown msg_channel end);
fun init_fifos fifo1 fifo2 = init (fn () => System_Channel.fifo_rendezvous fifo1 fifo2);
fun init_socket name = init (fn () => System_Channel.socket_rendezvous name);
end;