(***********************************************************************) (* *) (* Objective Caml *) (* *) (* Jerome Vouillon, projet Cristal, INRIA Rocquencourt *) (* Objective Caml port by John Malecki and Xavier Leroy *) (* *) (* Copyright 1996 Institut National de Recherche en Informatique et *) (* Automatique. Distributed only by permission. *) (* *) (***********************************************************************) (* $Id$ *) open Debugger_config open Misc open Path open Instruct open Types open Parser_aux type error = Unbound_identifier of Ident.t | Not_initialized_yet of Path.t | Unbound_long_identifier of Longident.t | Unknown_name of int | Tuple_index of type_expr * int * int | Array_index of int * int | List_index of int * int | String_index of string * int * int | Wrong_item_type of type_expr * int | Wrong_label of type_expr * string | Not_a_record of type_expr | No_result exception Error of error let rec path event = function Pident id -> if Ident.global id then Debugcom.get_global (Symtable.get_global_position id) else begin try let pos = Ident.find_same id event.ev_compenv.ce_stack in Debugcom.get_local (event.ev_stacksize - pos) with Not_found -> try let pos = Ident.find_same id event.ev_compenv.ce_heap in Debugcom.get_environment (pos + 1) with Not_found -> raise(Error(Unbound_identifier id)) end | Pdot(root, fieldname, pos) -> let v = path event root in if Debugcom.remote_value_is_int v then raise(Error(Not_initialized_yet root)); Debugcom.get_field v pos | Papply(p1, p2) -> fatal_error "Eval.path: Papply" let rec expression event env = function E_ident lid -> begin try let (p, valdesc) = Env.lookup_value lid env in Ctype.correct_level env valdesc.val_type; (path event p, valdesc.val_type) with Not_found -> raise(Error(Unbound_long_identifier lid)) end | E_result -> begin match event.ev_kind with Event_after ty when !Frames.current_frame = 0 -> (Debugcom.get_accu(), ty) | _ -> raise(Error(No_result)) end | E_name n -> begin try Printval.find_named_value n with Not_found -> raise(Error(Unknown_name n)) end | E_item(arg, n) -> let (v, ty) = expression event env arg in begin match (Ctype.repr(Ctype.expand_head env ty)).desc with Ttuple ty_list -> if n < 1 || n > List.length ty_list then raise(Error(Tuple_index(ty, List.length ty_list, n))) else (Debugcom.get_field v (n-1), List.nth ty_list (n-1)) | Tconstr(path, [ty_arg], _) when Path.same path Predef.path_array -> let (_, size) = Debugcom.get_header v in if n >= size then raise(Error(Array_index(size, n))) else (Debugcom.get_field v n, ty_arg) | Tconstr(path, [ty_arg], _) when Path.same path Predef.path_list -> let rec nth pos v = if Debugcom.remote_value_is_int v then raise(Error(List_index(pos, n))) else if pos = n then (Debugcom.get_field v 0, ty_arg) else nth (pos + 1) (Debugcom.get_field v 1) in nth 0 v | Tconstr(path, [], _) when Path.same path Predef.path_string -> let s = (Debugcom.marshal_obj v : string) in if n >= String.length s then raise(Error(String_index(s, String.length s, n))) else (Debugcom.value_int(Char.code s.[n]), Predef.type_char) | _ -> raise(Error(Wrong_item_type(ty, n))) end | E_field(arg, lbl) -> let (v, ty) = expression event env arg in begin match (Ctype.repr(Ctype.expand_head env ty)).desc with Tconstr(path, args, _) -> let tydesc = Env.find_type path env in begin match tydesc.type_kind with Type_record lbl_list -> let (pos, ty_res) = find_label lbl env ty path tydesc 0 lbl_list in (Debugcom.get_field v pos, ty_res) | _ -> raise(Error(Not_a_record ty)) end | _ -> raise(Error(Not_a_record ty)) end and find_label lbl env ty path tydesc pos = function [] -> raise(Error(Wrong_label(ty, lbl))) | (name, mut, ty_arg) :: rem -> if name = lbl then begin let ty_res = Ctype.newgenty(Tconstr(path, tydesc.type_params, ref Mnil)) in (pos, Ctype.substitute env [ty_res] [ty] ty_arg) end else find_label lbl env ty path tydesc (pos + 1) rem (* Error report *) open Format let report_error error = open_box 0; begin match error with Unbound_identifier id -> print_string "Unbound identifier "; print_string (Ident.name id) | Not_initialized_yet path -> print_string "The module path "; Printtyp.path path; print_string " is not yet initialized."; print_space(); print_string "Please run program forward until its initialization code is executed." | Unbound_long_identifier lid -> print_string "Unbound identifier "; Printtyp.longident lid | Unknown_name n -> print_string "Unknown value name $"; print_int n | Tuple_index(ty, len, pos) -> print_string "Cannot extract field number "; print_int pos; print_string " from a "; print_int len; print_string "-components tuple of type "; Printtyp.reset (); Printtyp.mark_loops ty; print_space(); Printtyp.type_expr ty | Array_index(len, pos) -> print_string "Cannot extract element number "; print_int pos; print_string " from array of length "; print_int len | List_index(len, pos) -> print_string "Cannot extract element number "; print_int pos; print_string " from list of length "; print_int len | String_index(s, len, pos) -> print_string "Cannot extract character number "; print_int pos; print_string " from the following string of length "; print_int len; print_string ":"; print_space(); print_char '"'; print_string(String.escaped s); print_char '"' | Wrong_item_type(ty, pos) -> print_string "Cannot extract item number "; print_int pos; print_string " from a value of type"; print_space(); Printtyp.type_expr ty | Wrong_label(ty, lbl) -> print_string "The record type"; print_space(); Printtyp.type_expr ty; print_space(); print_string " has no label named "; print_string lbl | Not_a_record ty -> print_string "The type"; print_space(); Printtyp.type_expr ty; print_space(); print_string " is not a record type" | No_result -> print_string "No result available at current program event" end; close_box(); print_newline()