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(***********************************************************************)
(* *)
(* OCaml *)
(* *)
(* Jerome Vouillon, projet Cristal, INRIA Rocquencourt *)
(* OCaml port by John Malecki and Xavier Leroy *)
(* *)
(* Copyright 1996 Institut National de Recherche en Informatique et *)
(* en Automatique. All rights reserved. This file is distributed *)
(* under the terms of the Q Public License version 1.0. *)
(* *)
(***********************************************************************)
(* $Id$ *)
(******************************* Breakpoints ***************************)
open Checkpoints
open Debugcom
open Instruct
open Primitives
open Printf
(*** Debugging. ***)
let debug_breakpoints = ref false
(*** Data. ***)
(* Number of the last added breakpoint. *)
let breakpoint_number = ref 0
(* Breakpoint number -> event. *)
let breakpoints = ref ([] : (int * debug_event) list)
(* Program counter -> breakpoint count. *)
let positions = ref ([] : (int * int ref) list)
(* Versions of the breakpoint list. *)
let current_version = ref 0
let max_version = ref 0
(*** Miscellaneous. ***)
(* Mark breakpoints as installed in current checkpoint. *)
let copy_breakpoints () =
!current_checkpoint.c_breakpoints <- !positions;
!current_checkpoint.c_breakpoint_version <- !current_version
(* Announce a new version of the breakpoint list. *)
let new_version () =
incr max_version;
current_version := !max_version
(*** Information about breakpoints. ***)
let breakpoints_count () =
List.length !breakpoints
(* List of breakpoints at `pc'. *)
let rec breakpoints_at_pc pc =
begin try
let ev = Symbols.event_at_pc pc in
match ev.ev_repr with
Event_child {contents = pc'} -> breakpoints_at_pc pc'
| _ -> []
with Not_found ->
[]
end
@
List.map fst (List.filter (function (_, {ev_pos = pos}) -> pos = pc) !breakpoints)
(* Is there a breakpoint at `pc' ? *)
let breakpoint_at_pc pc =
breakpoints_at_pc pc <> []
(*** Set and remove breakpoints ***)
(* Remove all breakpoints. *)
let remove_breakpoints pos =
if !debug_breakpoints then
(print_string "Removing breakpoints..."; print_newline ());
List.iter
(function (pos, _) ->
if !debug_breakpoints then begin
print_int pos;
print_newline()
end;
reset_instr pos;
Symbols.set_event_at_pc pos)
pos
(* Set all breakpoints. *)
let set_breakpoints pos =
if !debug_breakpoints then
(print_string "Setting breakpoints..."; print_newline ());
List.iter
(function (pos, _) ->
if !debug_breakpoints then begin
print_int pos;
print_newline()
end;
set_breakpoint pos)
pos
(* Ensure the current version in installed in current checkpoint. *)
let update_breakpoints () =
if !debug_breakpoints then begin
prerr_string "Updating breakpoints... ";
prerr_int !current_checkpoint.c_breakpoint_version;
prerr_string " ";
prerr_int !current_version;
prerr_endline ""
end;
if !current_checkpoint.c_breakpoint_version <> !current_version then
Exec.protect
(function () ->
remove_breakpoints !current_checkpoint.c_breakpoints;
set_breakpoints !positions;
copy_breakpoints ())
let change_version version pos =
Exec.protect
(function () ->
current_version := version;
positions := pos)
(* Execute given function with no breakpoint in current checkpoint. *)
(* --- `goto' runs faster this way (does not stop on each breakpoint). *)
let execute_without_breakpoints f =
let version = !current_version
and pos = !positions
in
change_version 0 [];
try
f ();
change_version version pos
with
x ->
change_version version pos
(* Add a position in the position list. *)
(* Change version if necessary. *)
let insert_position pos =
try
incr (List.assoc pos !positions)
with
Not_found ->
positions := (pos, ref 1) :: !positions;
new_version ()
(* Remove a position in the position list. *)
(* Change version if necessary. *)
let remove_position pos =
let count = List.assoc pos !positions in
decr count;
if !count = 0 then begin
positions := List.remove_assoc pos !positions;
new_version ()
end
(* Insert a new breakpoint in lists. *)
let rec new_breakpoint =
function
{ev_repr = Event_child pc} ->
new_breakpoint (Symbols.any_event_at_pc !pc)
| event ->
Exec.protect
(function () ->
incr breakpoint_number;
insert_position event.ev_pos;
breakpoints := (!breakpoint_number, event) :: !breakpoints);
printf "Breakpoint %d at %d : %s" !breakpoint_number event.ev_pos
(Pos.get_desc event);
print_newline ()
(* Remove a breakpoint from lists. *)
let remove_breakpoint number =
try
let ev = List.assoc number !breakpoints in
let pos = ev.ev_pos in
Exec.protect
(function () ->
breakpoints := List.remove_assoc number !breakpoints;
remove_position pos;
printf "Removed breakpoint %d at %d : %s" number ev.ev_pos
(Pos.get_desc ev);
print_newline ()
)
with
Not_found ->
prerr_endline ("No breakpoint number " ^ (string_of_int number) ^ ".");
raise Not_found
let remove_all_breakpoints () =
List.iter (function (number, _) -> remove_breakpoint number) !breakpoints
(*** Temporary breakpoints. ***)
(* Temporary breakpoint position. *)
let temporary_breakpoint_position = ref (None : int option)
(* Execute `funct' with a breakpoint added at `pc'. *)
(* --- Used by `finish'. *)
let exec_with_temporary_breakpoint pc funct =
let previous_version = !current_version in
let remove () =
temporary_breakpoint_position := None;
current_version := previous_version;
let count = List.assoc pc !positions in
decr count;
if !count = 0 then begin
positions := List.remove_assoc pc !positions;
reset_instr pc;
Symbols.set_event_at_pc pc
end
in
Exec.protect (function () -> insert_position pc);
temporary_breakpoint_position := Some pc;
try
funct ();
Exec.protect remove
with
x ->
Exec.protect remove;
raise x
|
