-- --
-- S p e c --
-- --
--- Copyright (C) 1992-2003 Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2011, Free Software Foundation, Inc. --
-- --
-- This specification is derived from the Ada Reference Manual for use with --
-- GNAT. The copyright notice above, and the license provisions that follow --
-- --
-- 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 2, or (at your option) any later ver- --
+-- 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. See the GNU General Public License --
--- for more details. You should have received a copy of the GNU General --
--- Public License distributed with GNAT; see file COPYING. If not, write --
--- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
--- MA 02111-1307, USA. --
+-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
--- As a special exception, if other files instantiate generics from this --
--- unit, or you link this unit with other files to produce an executable, --
--- this unit does not by itself cause the resulting executable to be --
--- covered by the GNU General Public License. This exception does not --
--- however invalidate any other reasons why the executable file might be --
--- covered by the GNU Public License. --
+-- 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. --
-- --
------------------------------------------------------------------------------
+-- This version of Ada.Exceptions is a full Ada 95 version. It omits Ada 2005
+-- features such as the additional definitions of Exception_Name returning
+-- Wide_[Wide_]String.
+
+-- It is used for building the compiler and the basic tools, since these
+-- builds may be done with bootstrap compilers that cannot handle these
+-- additions. The full version of Ada.Exceptions can be found in the files
+-- a-except-2005.ads/adb, and is used for all other builds where full Ada
+-- 2005 functionality is required. In particular, it is used for building
+-- run times on all targets.
+
+pragma Compiler_Unit;
+
pragma Polling (Off);
-- We must turn polling off for this unit, because otherwise we get
-- elaboration circularities with ourself.
with System;
+with System.Parameters;
with System.Standard_Library;
with System.Traceback_Entries;
package Ada.Exceptions is
+ pragma Warnings (Off);
+ pragma Preelaborate_05;
+ pragma Warnings (On);
+ -- We make this preelaborable in Ada 2005 mode. If we did not do this, then
+ -- run time units used by the compiler (e.g. s-soflin.ads) would run
+ -- into trouble. Conformance is not an issue, since this version is used
+ -- only by the compiler.
type Exception_Id is private;
+
Null_Id : constant Exception_Id;
type Exception_Occurrence is limited private;
+
type Exception_Occurrence_Access is access all Exception_Occurrence;
Null_Occurrence : constant Exception_Occurrence;
function Exception_Name (Id : Exception_Id) return String;
procedure Raise_Exception (E : Exception_Id; Message : String := "");
- -- Note: it would be really nice to give a pragma No_Return for this
- -- procedure, but it would be wrong, since Raise_Exception does return
- -- if given the null exception. However we do special case the name in
- -- the test in the compiler for issuing a warning for a missing return
- -- after this call. Program_Error seems reasonable enough in such a case.
- -- See also the routine Raise_Exception_Always in the private part.
+ pragma No_Return (Raise_Exception);
+ -- Note: In accordance with AI-466, CE is raised if E = Null_Id
function Exception_Message (X : Exception_Occurrence) return String;
private
package SSL renames System.Standard_Library;
+ package SP renames System.Parameters;
subtype EOA is Exception_Occurrence_Access;
- Exception_Msg_Max_Length : constant := 200;
+ Exception_Msg_Max_Length : constant := SP.Default_Exception_Msg_Max_Length;
------------------
-- Exception_Id --
------------------
subtype Code_Loc is System.Address;
- -- Code location used in building exception tables and for call
- -- addresses when propagating an exception.
- -- Values of this type are created by using Label'Address or
- -- extracted from machine states using Get_Code_Loc.
+ -- Code location used in building exception tables and for call addresses
+ -- when propagating an exception. Values of this type are created by using
+ -- Label'Address or extracted from machine states using Get_Code_Loc.
Null_Loc : constant Code_Loc := System.Null_Address;
-- Null code location, used to flag outer level frame
-- to be in the visible part, since this is set by the reference manual).
function Exception_Name_Simple (X : Exception_Occurrence) return String;
- -- Like Exception_Name, but returns the simple non-qualified name of
- -- the exception. This is used to implement the Exception_Name function
- -- in Current_Exceptions (the DEC compatible unit). It is called from
- -- the compiler generated code (using Rtsfind, which does not respect
- -- the private barrier, so we can place this function in the private
- -- part where the compiler can find it, but the spec is unchanged.)
+ -- Like Exception_Name, but returns the simple non-qualified name of the
+ -- exception. This is used to implement the Exception_Name function in
+ -- Current_Exceptions (the DEC compatible unit). It is called from the
+ -- compiler generated code (using Rtsfind, which does not respect the
+ -- private barrier, so we can place this function in the private part
+ -- where the compiler can find it, but the spec is unchanged.)
procedure Raise_Exception_Always (E : Exception_Id; Message : String := "");
pragma No_Return (Raise_Exception_Always);
pragma Export (Ada, Raise_Exception_Always, "__gnat_raise_exception");
-- This differs from Raise_Exception only in that the caller has determined
- -- that for sure the parameter E is not null, and that therefore the call
- -- to this procedure cannot return. The expander converts Raise_Exception
- -- calls to Raise_Exception_Always if it can determine this is the case.
- -- The Export allows this routine to be accessed from Pure units.
+ -- that for sure the parameter E is not null, and that therefore no check
+ -- for Null_Id is required. The expander converts Raise_Exception calls to
+ -- Raise_Exception_Always if it can determine this is the case. The Export
+ -- allows this routine to be accessed from Pure units.
procedure Raise_From_Signal_Handler
(E : Exception_Id;
- M : SSL.Big_String_Ptr);
+ M : System.Address);
pragma Export
(Ada, Raise_From_Signal_Handler,
"ada__exceptions__raise_from_signal_handler");
pragma No_Return (Raise_From_Signal_Handler);
- -- This routine is used to raise an exception from a signal handler.
- -- The signal handler has already stored the machine state (i.e. the
- -- state that corresponds to the location at which the signal was
- -- raised). E is the Exception_Id specifying what exception is being
- -- raised, and M is a pointer to a null-terminated string which is the
- -- message to be raised. Note that this routine never returns, so it is
- -- permissible to simply jump to this routine, rather than call it. This
- -- may be appropriate for systems where the right way to get out of a
- -- signal handler is to alter the PC value in the machine state or in
- -- some other way ask the operating system to return here rather than
- -- to the original location.
+ -- This routine is used to raise an exception from a signal handler. The
+ -- signal handler has already stored the machine state (i.e. the state that
+ -- corresponds to the location at which the signal was raised). E is the
+ -- Exception_Id specifying what exception is being raised, and M is a
+ -- pointer to a null-terminated string which is the message to be raised.
+ -- Note that this routine never returns, so it is permissible to simply
+ -- jump to this routine, rather than call it. This may be appropriate for
+ -- systems where the right way to get out of signal handler is to alter the
+ -- PC value in the machine state or in some other way ask the operating
+ -- system to return here rather than to the original location.
+
+ procedure Raise_From_Controlled_Operation
+ (X : Ada.Exceptions.Exception_Occurrence);
+ pragma No_Return (Raise_From_Controlled_Operation);
+ pragma Export
+ (Ada, Raise_From_Controlled_Operation,
+ "__gnat_raise_from_controlled_operation");
+ -- Raise Program_Error, providing information about X (an exception raised
+ -- during a controlled operation) in the exception message.
procedure Reraise_Occurrence_Always (X : Exception_Occurrence);
pragma No_Return (Reraise_Occurrence_Always);
pragma No_Return (Reraise_Occurrence_No_Defer);
-- Exactly like Reraise_Occurrence, except that abort is not deferred
-- before the call and the parameter X is known not to be the null
- -- occurrence. This is used in generated code when it is known
- -- that abort is already deferred.
+ -- occurrence. This is used in generated code when it is known that
+ -- abort is already deferred.
+
+ function Triggered_By_Abort return Boolean;
+ -- Determine whether the current exception (if it exists) is an instance of
+ -- Standard'Abort_Signal.
-----------------------
-- Polling Interface --
-- purposes (e.g. implementing watchpoints in software or in the debugger).
-- In the GNAT technology itself, this interface is used to implement
- -- immediate aynschronous transfer of control and immediate abort on
+ -- immediate asynchronous transfer of control and immediate abort on
-- targets which do not provide for one thread interrupting another.
-- Note: this used to be in a separate unit called System.Poll, but that
Msg : String (1 .. Exception_Msg_Max_Length);
-- Characters of message
- Cleanup_Flag : Boolean;
- -- The cleanup flag is normally False, it is set True for an exception
- -- occurrence passed to a cleanup routine, and will still be set True
- -- when the cleanup routine does a Reraise_Occurrence call using this
- -- exception occurrence. This is used to avoid recording a bogus trace
- -- back entry from this reraise call.
-
Exception_Raised : Boolean := False;
-- Set to true to indicate that this exception occurrence has actually
-- been raised. When an exception occurrence is first created, this is
-- it is dealing with the reraise case (which is useful to distinguish
-- for exception tracing purposes).
- Pid : Natural;
+ Pid : Natural := 0;
-- Partition_Id for partition raising exception
Num_Tracebacks : Natural range 0 .. Max_Tracebacks := 0;
Tracebacks : Tracebacks_Array;
-- Stored tracebacks (in Tracebacks (1 .. Num_Tracebacks))
-
- Private_Data : System.Address := System.Null_Address;
- -- Field used by low level exception mechanism to store specific data.
- -- Currently used by the GCC exception mechanism to store a pointer to
- -- a GNAT_GCC_Exception.
end record;
function "=" (Left, Right : Exception_Occurrence) return Boolean
-- Functions for implementing Exception_Occurrence stream attributes
Null_Occurrence : constant Exception_Occurrence := (
- Id => Null_Id,
+ Id => null,
Msg_Length => 0,
Msg => (others => ' '),
- Cleanup_Flag => False,
Exception_Raised => False,
Pid => 0,
Num_Tracebacks => 0,
- Tracebacks => (others => TBE.Null_TB_Entry),
- Private_Data => System.Null_Address);
+ Tracebacks => (others => TBE.Null_TB_Entry));
end Ada.Exceptions;
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