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--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--              G N A T . E X C E P T I O N _ A C T I O N S                 --

--                                                                          --

--                                 S p e c                                  --

--                                                                          --

--          Copyright (C) 2002-2009, Free Software Foundation, Inc.         --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 3,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --

-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --

--                                                                          --

-- As a special exception 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/>.                                          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

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--  This package provides support for callbacks on exceptions

--  These callbacks are called immediately when either a specific exception,

--  or any exception, is raised, before any other actions taken by raise, in

--  particular before any unwinding of the stack occurs.

--  Callbacks for specific exceptions are registered through calls to

--  Register_Id_Action. Here is an example of code that uses this package to

--  automatically core dump when the exception Constraint_Error is raised.

--      Register_Id_Action (Constraint_Error'Identity, Core_Dump'Access);

--  Subprograms are also provided to list the currently registered exceptions,

--  or to convert from a string to an exception id.

--  This package can easily be extended, for instance to provide a callback

--  whenever an exception matching a regular expression is raised. The idea

--  is to register a global action, called whenever any exception is raised.

--  Dispatching can then be done directly in this global action callback.

with Ada.Exceptions; use Ada.Exceptions;

package GNAT.Exception_Actions is

   type Exception_Action is access

     procedure (Occurence : Exception_Occurrence);

   --  General callback type whenever an exception is raised. The callback

   --  procedure must not propagate an exception (execution of the program

   --  is erroneous if such an exception is propagated).

   procedure Register_Global_Action (Action : Exception_Action);

   --  Action will be called whenever an exception is raised. Only one such

   --  action can be registered at any given time, and registering a new action

   --  will override any previous action that might have been registered.

   --

   --  Action is called before the exception is propagated to user's code.

   --  If Action is null, this will in effect cancel all exception actions.

   procedure Register_Id_Action

     (Id     : Exception_Id;

      Action : Exception_Action);

   --  Action will be called whenever an exception of type Id is raised. Only

   --  one such action can be registered for each exception id, and registering

   --  a new action will override any previous action registered for this

   --  Exception_Id. Program_Error is raised if Id is Null_Id.

   function Name_To_Id (Name : String) return Exception_Id;

   --  Convert an exception name to an exception id. Null_Id is returned

   --  if no such exception exists. Name must be an all upper-case string,

   --  or the exception will not be found. The exception name must be fully

   --  qualified (but not including Standard). It is not possible to convert

   --  an exception that is declared within an unlabeled block.

   --

   --  Note: All non-predefined exceptions will return Null_Id for programs

   --  compiled with pragma Restriction (No_Exception_Registration)

   function Registered_Exceptions_Count return Natural;

   --  Return the number of exceptions that have been registered so far.

   --  Exceptions declared locally will not appear in this list until their

   --  block has been executed at least once.

   --

   --  Note: The count includes only predefined exceptions for programs

   --  compiled with pragma Restrictions (No_Exception_Registration).

   type Exception_Id_Array is array (Natural range <>) of Exception_Id;

   procedure Get_Registered_Exceptions

     (List : out Exception_Id_Array;

      Last : out Integer);

   --  Return the list of registered exceptions.

   --  Last is the index in List of the last exception returned.

   --

   --  An exception is registered the first time the block containing its

   --  declaration is elaborated. Exceptions defined at library-level are

   --  therefore immediately visible, whereas exceptions declared in local

   --  blocks will not be visible until the block is executed at least once.

   --

   --  Note: The list contains only the predefined exceptions if the program

   --  is compiled with pragma Restrictions (No_Exception_Registration);

   procedure Core_Dump (Occurrence : Exception_Occurrence);

   --  Dump memory (called a core dump in some systems), and abort execution

   --  of the application.

end GNAT.Exception_Actions;