131 lines
4.4 KiB
OCaml
131 lines
4.4 KiB
OCaml
(**************************************************************************)
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(* *)
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(* OCaml *)
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(* *)
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(* Jerome Vouillon, projet Cristal, INRIA Rocquencourt *)
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(* OCaml port by John Malecki and Xavier Leroy *)
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(* *)
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(* Copyright 1996 Institut National de Recherche en Informatique et *)
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(* en Automatique. *)
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(* *)
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(* All rights reserved. This file is distributed under the terms of *)
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(* the GNU Lesser General Public License version 2.1, with the *)
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(* special exception on linking described in the file LICENSE. *)
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(* *)
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(**************************************************************************)
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(***************************** Frames **********************************)
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open Instruct
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open Debugcom
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open Events
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open Symbols
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(* Current frame number *)
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let current_frame = ref 0
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(* Event at selected position *)
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let selected_event = ref (None : debug_event option)
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(* Selected position in source. *)
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(* Raise `Not_found' if not on an event. *)
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let selected_point () =
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match !selected_event with
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None ->
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raise Not_found
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| Some ev ->
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(ev.ev_module,
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(Events.get_pos ev).Lexing.pos_lnum,
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(Events.get_pos ev).Lexing.pos_cnum - (Events.get_pos ev).Lexing.pos_bol)
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let selected_event_is_before () =
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match !selected_event with
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None ->
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raise Not_found
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| Some {ev_kind = Event_before} ->
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true
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| _ ->
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false
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(* Move up `frame_count' frames, assuming current frame pointer
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corresponds to event `event'. Return event of final frame. *)
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let rec move_up frame_count event =
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if frame_count <= 0 then event else begin
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let (sp, pc) = up_frame event.ev_stacksize in
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if sp < 0 then raise Not_found;
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move_up (frame_count - 1) (any_event_at_pc pc)
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end
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(* Select a frame. *)
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(* Raise `Not_found' if no such frame. *)
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(* --- Assume the current events have already been updated. *)
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let select_frame frame_number =
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if frame_number < 0 then raise Not_found;
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let (initial_sp, _) = get_frame() in
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try
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match !current_event with
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None ->
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raise Not_found
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| Some curr_event ->
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match !selected_event with
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Some sel_event when frame_number >= !current_frame ->
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selected_event :=
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Some(move_up (frame_number - !current_frame) sel_event);
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current_frame := frame_number
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| _ ->
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set_initial_frame();
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selected_event := Some(move_up frame_number curr_event);
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current_frame := frame_number
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with Not_found ->
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set_frame initial_sp;
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raise Not_found
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(* Select a frame. *)
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(* Same as `select_frame' but raise no exception if the frame is not found. *)
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(* --- Assume the currents events have already been updated. *)
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let try_select_frame frame_number =
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try
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select_frame frame_number
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with
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Not_found ->
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()
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(* Return to default frame (frame 0). *)
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let reset_frame () =
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set_initial_frame();
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selected_event := !current_event;
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current_frame := 0
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(* Perform a stack backtrace.
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Call the given function with the events for each stack frame,
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or None if we've encountered a stack frame with no debugging info
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attached. Stop when the function returns false, or frame with no
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debugging info reached, or top of stack reached. *)
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let do_backtrace action =
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match !current_event with
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None -> Misc.fatal_error "Frames.do_backtrace"
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| Some curr_ev ->
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let (initial_sp, _) = get_frame() in
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set_initial_frame();
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let event = ref curr_ev in
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begin try
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while action (Some !event) do
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let (sp, pc) = up_frame !event.ev_stacksize in
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if sp < 0 then raise Exit;
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event := any_event_at_pc pc
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done
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with Exit -> ()
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| Not_found -> ignore (action None)
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end;
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set_frame initial_sp
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(* Return the number of frames in the stack *)
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let stack_depth () =
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let num_frames = ref 0 in
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do_backtrace (function Some _ev -> incr num_frames; true
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| None -> num_frames := -1; false);
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!num_frames
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