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-------------------------------------------------------------------------------
--- --
--- GNAT RUN-TIME COMPONENTS --
--- --
--- A D A . E X C E P T I O N S --
--- --
--- S p e c --
--- --
--- Copyright (C) 1992-2012, 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 --
--- apply solely to the contents of the part following the private keyword. --
--- --
--- 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. --
--- --
-------------------------------------------------------------------------------
-
--- This version of Ada.Exceptions fully supports both Ada 95 and Ada 2005.
--- It is used in all situations except for the build of the compiler and
--- other basic tools. For these latter builds, we use an Ada 95-only version.
-
--- The reason for this splitting off of a separate version is that bootstrap
--- compilers often will be used that do not support Ada 2005 features, and
--- Ada.Exceptions is part of the compiler sources.
-
-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);
- -- In accordance with Ada 2005 AI-362. The warnings pragmas are so that we
- -- can compile this using older compiler versions, which will ignore the
- -- pragma, which is fine for the bootstrap.
-
- type Exception_Id is private;
- pragma Preelaborable_Initialization (Exception_Id);
-
- Null_Id : constant Exception_Id;
-
- type Exception_Occurrence is limited private;
- pragma Preelaborable_Initialization (Exception_Occurrence);
-
- type Exception_Occurrence_Access is access all Exception_Occurrence;
-
- Null_Occurrence : constant Exception_Occurrence;
-
- function Exception_Name (Id : Exception_Id) return String;
-
- function Exception_Name (X : Exception_Occurrence) return String;
-
- function Wide_Exception_Name
- (Id : Exception_Id) return Wide_String;
- pragma Ada_05 (Wide_Exception_Name);
-
- function Wide_Exception_Name
- (X : Exception_Occurrence) return Wide_String;
- pragma Ada_05 (Wide_Exception_Name);
-
- function Wide_Wide_Exception_Name
- (Id : Exception_Id) return Wide_Wide_String;
- pragma Ada_05 (Wide_Wide_Exception_Name);
-
- function Wide_Wide_Exception_Name
- (X : Exception_Occurrence) return Wide_Wide_String;
- pragma Ada_05 (Wide_Wide_Exception_Name);
-
- procedure Raise_Exception (E : Exception_Id; Message : String := "");
- 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;
-
- procedure Reraise_Occurrence (X : Exception_Occurrence);
- -- Note: it would be really nice to give a pragma No_Return for this
- -- procedure, but it would be wrong, since Reraise_Occurrence does return
- -- if the argument is the null exception occurrence. See also procedure
- -- Reraise_Occurrence_Always in the private part of this package.
-
- function Exception_Identity (X : Exception_Occurrence) return Exception_Id;
-
- function Exception_Information (X : Exception_Occurrence) return String;
- -- The format of the exception information is as follows:
- --
- -- exception name (as in Exception_Name)
- -- message (or a null line if no message)
- -- PID=nnnn
- -- 0xyyyyyyyy 0xyyyyyyyy ...
- --
- -- The lines are separated by a ASCII.LF character
- --
- -- The nnnn is the partition Id given as decimal digits
- --
- -- The 0x... line represents traceback program counter locations,
- -- in order with the first one being the exception location.
-
- -- Note on ordering: the compiler uses the Save_Occurrence procedure, but
- -- not the function from Rtsfind, so it is important that the procedure
- -- come first, since Rtsfind finds the first matching entity.
-
- procedure Save_Occurrence
- (Target : out Exception_Occurrence;
- Source : Exception_Occurrence);
-
- function Save_Occurrence
- (Source : Exception_Occurrence)
- return Exception_Occurrence_Access;
-
- -- Ada 2005 (AI-438): The language revision introduces the following
- -- subprograms and attribute definitions. We do not provide them
- -- explicitly. instead, the corresponding stream attributes are made
- -- available through a pragma Stream_Convert in the private part.
-
- -- procedure Read_Exception_Occurrence
- -- (Stream : not null access Ada.Streams.Root_Stream_Type'Class;
- -- Item : out Exception_Occurrence);
-
- -- procedure Write_Exception_Occurrence
- -- (Stream : not null access Ada.Streams.Root_Stream_Type'Class;
- -- Item : Exception_Occurrence);
-
- -- for Exception_Occurrence'Read use Read_Exception_Occurrence;
- -- for Exception_Occurrence'Write use Write_Exception_Occurrence;
-
-private
- package SSL renames System.Standard_Library;
- package SP renames System.Parameters;
-
- subtype EOA is Exception_Occurrence_Access;
-
- 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.
-
- Null_Loc : constant Code_Loc := System.Null_Address;
- -- Null code location, used to flag outer level frame
-
- type Exception_Id is new SSL.Exception_Data_Ptr;
-
- function EId_To_String (X : Exception_Id) return String;
- function String_To_EId (S : String) return Exception_Id;
- pragma Stream_Convert (Exception_Id, String_To_EId, EId_To_String);
- -- Functions for implementing Exception_Id stream attributes
-
- Null_Id : constant Exception_Id := null;
-
- -------------------------
- -- Private Subprograms --
- -------------------------
-
- function Current_Target_Exception return Exception_Occurrence;
- pragma Export
- (Ada, Current_Target_Exception,
- "__gnat_current_target_exception");
- -- This routine should return the current raised exception on targets which
- -- have built-in exception handling such as the Java Virtual Machine. For
- -- other targets this routine is simply ignored. Currently, only JGNAT
- -- uses this. See 4jexcept.ads for details. The pragma Export allows this
- -- routine to be accessed elsewhere in the run-time, even though it is in
- -- the private part of this package (it is not allowed 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.)
-
- 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 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 : 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 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_Library_Exception_If_Any;
- pragma Export
- (Ada, Reraise_Library_Exception_If_Any,
- "__gnat_reraise_library_exception_if_any");
- -- If there was an exception raised during library-level finalization,
- -- reraise the exception.
-
- procedure Reraise_Occurrence_Always (X : Exception_Occurrence);
- pragma No_Return (Reraise_Occurrence_Always);
- -- This differs from Raise_Occurrence only in that the caller guarantees
- -- that for sure the parameter X is not the null occurrence, and that
- -- therefore this procedure cannot return. The expander uses this routine
- -- in the translation of a raise statement with no parameter (reraise).
-
- procedure Reraise_Occurrence_No_Defer (X : Exception_Occurrence);
- 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.
-
- function Triggered_By_Abort return Boolean;
- -- Determine whether the current exception (if it exists) is an instance of
- -- Standard'Abort_Signal.
-
- -----------------------
- -- Polling Interface --
- -----------------------
-
- -- The GNAT compiler has an option to generate polling calls to the Poll
- -- routine in this package. Specifying the -gnatP option for a compilation
- -- causes a call to Ada.Exceptions.Poll to be generated on every subprogram
- -- entry and on every iteration of a loop, thus avoiding the possibility of
- -- a case of unbounded time between calls.
-
- -- This polling interface may be used for instrumentation or debugging
- -- purposes (e.g. implementing watchpoints in software or in the debugger).
-
- -- In the GNAT technology itself, this interface is used to implement
- -- 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
- -- caused horrible circular elaboration problems between System.Poll and
- -- Ada.Exceptions. One way of solving such circularities is unification!
-
- procedure Poll;
- -- Check for asynchronous abort. Note that we do not inline the body.
- -- This makes the interface more useful for debugging purposes.
-
- --------------------------
- -- Exception_Occurrence --
- --------------------------
-
- package TBE renames System.Traceback_Entries;
-
- Max_Tracebacks : constant := 50;
- -- Maximum number of trace backs stored in exception occurrence
-
- type Tracebacks_Array is array (1 .. Max_Tracebacks) of TBE.Traceback_Entry;
- -- Traceback array stored in exception occurrence
-
- type Exception_Occurrence is record
- Id : Exception_Id;
- -- Exception_Identity for this exception occurrence
-
- Machine_Occurrence : System.Address;
- -- The underlying machine occurrence. For GCC, this corresponds to the
- -- _Unwind_Exception structure address.
-
- Msg_Length : Natural := 0;
- -- Length of message (zero = no message)
-
- Msg : String (1 .. Exception_Msg_Max_Length);
- -- Characters of message
-
- 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
- -- set to False, then when it is processed by Raise_Current_Exception,
- -- it is set to True. If Raise_Current_Exception is used to raise an
- -- exception for which this flag is already True, then it knows that
- -- it is dealing with the reraise case (which is useful to distinguish
- -- for exception tracing purposes).
-
- Pid : Natural := 0;
- -- Partition_Id for partition raising exception
-
- Num_Tracebacks : Natural range 0 .. Max_Tracebacks := 0;
- -- Number of traceback entries stored
-
- Tracebacks : Tracebacks_Array;
- -- Stored tracebacks (in Tracebacks (1 .. Num_Tracebacks))
- end record;
-
- function "=" (Left, Right : Exception_Occurrence) return Boolean
- is abstract;
- -- Don't allow comparison on exception occurrences, we should not need
- -- this, and it would not work right, because of the Msg and Tracebacks
- -- fields which have unused entries not copied by Save_Occurrence.
-
- function EO_To_String (X : Exception_Occurrence) return String;
- function String_To_EO (S : String) return Exception_Occurrence;
- pragma Stream_Convert (Exception_Occurrence, String_To_EO, EO_To_String);
- -- Functions for implementing Exception_Occurrence stream attributes
-
- Null_Occurrence : constant Exception_Occurrence := (
- Id => null,
- Machine_Occurrence => System.Null_Address,
- Msg_Length => 0,
- Msg => (others => ' '),
- Exception_Raised => False,
- Pid => 0,
- Num_Tracebacks => 0,
- Tracebacks => (others => TBE.Null_TB_Entry));
-
-end Ada.Exceptions;