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(* RTExceptions.def runtime exception handler routines.
Copyright (C) 2008-2024 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.
This file is part of GNU Modula-2.
GNU Modula-2 is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.
GNU Modula-2 is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.
You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
<http://www.gnu.org/licenses/>. *)
DEFINITION MODULE RTExceptions ;
(* Runtime exception handler routines. This should
be considered as a system module for GNU Modula-2
and allow the compiler to interface with exception
handling. *)
FROM SYSTEM IMPORT ADDRESS ;
EXPORT QUALIFIED EHBlock,
Raise, SetExceptionBlock, GetExceptionBlock,
GetTextBuffer, GetTextBufferSize, GetNumber,
InitExceptionBlock, KillExceptionBlock,
PushHandler, PopHandler,
BaseExceptionsThrow, DefaultErrorCatch,
IsInExceptionState, SetExceptionState,
SwitchExceptionState, GetBaseExceptionBlock,
SetExceptionSource, GetExceptionSource ;
TYPE
EHBlock ;
ProcedureHandler = PROCEDURE ;
(*
Raise - invoke the exception handler associated with, number,
in the active EHBlock. It keeps a record of the number
and message in the EHBlock for later use.
*)
PROCEDURE Raise (number: CARDINAL;
file: ADDRESS; line: CARDINAL;
column: CARDINAL; function: ADDRESS;
message: ADDRESS) <* noreturn *> ;
(*
SetExceptionBlock - sets, source, as the active EHB.
*)
PROCEDURE SetExceptionBlock (source: EHBlock) ;
(*
GetExceptionBlock - returns the active EHB.
*)
PROCEDURE GetExceptionBlock () : EHBlock ;
(*
GetTextBuffer - returns the address of the EHB buffer.
*)
PROCEDURE GetTextBuffer (e: EHBlock) : ADDRESS ;
(*
GetTextBufferSize - return the size of the EHB text buffer.
*)
PROCEDURE GetTextBufferSize (e: EHBlock) : CARDINAL ;
(*
GetNumber - return the exception number associated with,
source.
*)
PROCEDURE GetNumber (source: EHBlock) : CARDINAL ;
(*
InitExceptionBlock - creates and returns a new exception block.
*)
PROCEDURE InitExceptionBlock () : EHBlock ;
(*
KillExceptionBlock - destroys the EHB, e, and all its handlers.
*)
PROCEDURE KillExceptionBlock (e: EHBlock) : EHBlock ;
(*
PushHandler - install a handler in EHB, e.
*)
PROCEDURE PushHandler (e: EHBlock; number: CARDINAL; p: ProcedureHandler) ;
(*
PopHandler - removes the handler associated with, number, from
EHB, e.
*)
PROCEDURE PopHandler (e: EHBlock; number: CARDINAL) ;
(*
DefaultErrorCatch - displays the current error message in
the current exception block and then
calls HALT.
*)
PROCEDURE DefaultErrorCatch ;
(*
BaseExceptionsThrow - configures the Modula-2 exceptions to call
THROW which in turn can be caught by an
exception block. If this is not called then
a Modula-2 exception will simply call an
error message routine and then HALT.
*)
PROCEDURE BaseExceptionsThrow ;
(*
IsInExceptionState - returns TRUE if the program is currently
in the exception state.
*)
PROCEDURE IsInExceptionState () : BOOLEAN ;
(*
SetExceptionState - returns the current exception state and
then sets the current exception state to,
to.
*)
PROCEDURE SetExceptionState (to: BOOLEAN) : BOOLEAN ;
(*
SwitchExceptionState - assigns, from, with the current exception
state and then assigns the current exception
to, to.
*)
PROCEDURE SwitchExceptionState (VAR from: BOOLEAN; to: BOOLEAN) ;
(*
GetBaseExceptionBlock - returns the initial language exception block
created.
*)
PROCEDURE GetBaseExceptionBlock () : EHBlock ;
(*
SetExceptionSource - sets the current exception source to, source.
*)
PROCEDURE SetExceptionSource (source: ADDRESS) ;
(*
GetExceptionSource - returns the current exception source.
*)
PROCEDURE GetExceptionSource () : ADDRESS ;
END RTExceptions.
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