a-envvar.adb, [...]: New files.

2006-02-13  Nicolas Roche  <roche@adacore.com>

	* a-envvar.adb, a-envvar.ads: New files.

From-SVN: r111039

gcc/ada/s-parame-vms.ads → gcc/ada/s-parame-vms-alpha.ads

@@ -31,7 +31,7 @@
 --                                                                          --
 ------------------------------------------------------------------------------
 
---  This is the OpenVMS version
+--  This is the OpenVMS Alpha version
 
 --  This package defines some system dependent parameters for GNAT. These
 --  are values that are referenced by the runtime library and are therefore

gcc/ada/s-parame-vms-ia64.ads

+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                    S Y S T E M . P A R A M E T E R S                     --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--          Copyright (C) 1992-2005 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 2,  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,  51  Franklin  Street,  Fifth  Floor, --
+-- Boston, MA 02110-1301, USA.                                              --
+--                                                                          --
+-- 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.                                      --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This is the Integrity OpenVMS version
+
+--  This package defines some system dependent parameters for GNAT. These
+--  are values that are referenced by the runtime library and are therefore
+--  relevant to the target machine.
+
+--  The parameters whose value is defined in the spec are not generally
+--  expected to be changed. If they are changed, it will be necessary to
+--  recompile the run-time library.
+
+--  The parameters which are defined by functions can be changed by modifying
+--  the body of System.Parameters in file s-parame.adb. A change to this body
+--  requires only rebinding and relinking of the application.
+
+--  Note: do not introduce any pragma Inline statements into this unit, since
+--  otherwise the relinking and rebinding capability would be deactivated.
+
+package System.Parameters is
+   pragma Pure;
+
+   ---------------------------------------
+   -- Task And Stack Allocation Control --
+   ---------------------------------------
+
+   type Task_Storage_Size is new Integer;
+   --  Type used in tasking units for task storage size
+
+   type Size_Type is new Task_Storage_Size;
+   --  Type used to provide task storage size to runtime
+
+   Unspecified_Size : constant Size_Type := Size_Type'First;
+   --  Value used to indicate that no size type is set
+
+   subtype Ratio is Size_Type range -1 .. 100;
+   Dynamic : constant Size_Type := -1;
+   --  The secondary stack ratio is a constant between 0 and 100 which
+   --  determines the percentage of the allocated task stack that is
+   --  used by the secondary stack (the rest being the primary stack).
+   --  The special value of minus one indicates that the secondary
+   --  stack is to be allocated from the heap instead.
+
+   Sec_Stack_Ratio : constant Ratio := Dynamic;
+   --  This constant defines the handling of the secondary stack
+
+   Sec_Stack_Dynamic : constant Boolean := Sec_Stack_Ratio = Dynamic;
+   --  Convenient Boolean for testing for dynamic secondary stack
+
+   function Default_Stack_Size return Size_Type;
+   --  Default task stack size used if none is specified
+
+   function Minimum_Stack_Size return Size_Type;
+   --  Minimum task stack size permitted
+
+   function Adjust_Storage_Size (Size : Size_Type) return Size_Type;
+   --  Given the storage size stored in the TCB, return the Storage_Size
+   --  value required by the RM for the Storage_Size attribute. The
+   --  required adjustment is as follows:
+   --
+   --    when Size = Unspecified_Size, return Default_Stack_Size
+   --    when Size < Minimum_Stack_Size, return Minimum_Stack_Size
+   --    otherwise return given Size
+
+   Default_Env_Stack_Size : constant Size_Type := 8_192_000;
+   --  Assumed size of the environment task, if no other information
+   --  is available. This value is used when stack checking is
+   --  enabled and no GNAT_STACK_LIMIT environment variable is set.
+
+   Stack_Grows_Down  : constant Boolean := True;
+   --  This constant indicates whether the stack grows up (False) or
+   --  down (True) in memory as functions are called. It is used for
+   --  proper implementation of the stack overflow check.
+
+   ----------------------------------------------
+   -- Characteristics of types in Interfaces.C --
+   ----------------------------------------------
+
+   long_bits : constant := 32;
+   --  Number of bits in type long and unsigned_long. The normal convention
+   --  is that this is the same as type Long_Integer, but this is not true
+   --  of all targets. For example, in OpenVMS long /= Long_Integer.
+
+   ----------------------------------------------
+   -- Behavior of Pragma Finalize_Storage_Only --
+   ----------------------------------------------
+
+   --  Garbage_Collected is a Boolean constant whose value indicates the
+   --  effect of the pragma Finalize_Storage_Entry on a controlled type.
+
+   --    Garbage_Collected = False
+
+   --      The system releases all storage on program termination only,
+   --      but not other garbage collection occurs, so finalization calls
+   --      are ommitted only for outer level onjects can be omitted if
+   --      pragma Finalize_Storage_Only is used.
+
+   --    Garbage_Collected = True
+
+   --      The system provides full garbage collection, so it is never
+   --      necessary to release storage for controlled objects for which
+   --      a pragma Finalize_Storage_Only is used.
+
+   Garbage_Collected : constant Boolean := False;
+   --  The storage mode for this system (release on program exit)
+
+   ---------------------
+   -- Tasking Profile --
+   ---------------------
+
+   --  In the following sections, constant parameters are defined to
+   --  allow some optimizations and fine tuning within the tasking run time
+   --  based on restrictions on the tasking features.
+
+   ----------------------
+   -- Locking Strategy --
+   ----------------------
+
+   Single_Lock : constant Boolean := False;
+   --  Indicates whether a single lock should be used within the tasking
+   --  run-time to protect internal structures. If True, a single lock
+   --  will be used, meaning less locking/unlocking operations, but also
+   --  more global contention. In general, Single_Lock should be set to
+   --  True on single processor machines, and to False to multi-processor
+   --  systems, but this can vary from application to application and also
+   --  depends on the scheduling policy.
+
+   -------------------
+   -- Task Abortion --
+   -------------------
+
+   No_Abort : constant Boolean := False;
+   --  This constant indicates whether abort statements and asynchronous
+   --  transfer of control (ATC) are disallowed. If set to True, it is
+   --  assumed that neither construct is used, and the run time does not
+   --  need to defer/undefer abort and check for pending actions at
+   --  completion points. A value of True for No_Abort corresponds to:
+   --  pragma Restrictions (No_Abort_Statements);
+   --  pragma Restrictions (Max_Asynchronous_Select_Nesting => 0);
+
+   ----------------------
+   -- Dynamic Priority --
+   ----------------------
+
+   Dynamic_Priority_Support : constant Boolean := True;
+   --  This constant indicates whether dynamic changes of task priorities
+   --  are allowed (True means normal RM mode in which such changes are
+   --  allowed). In particular, if this is False, then we do not need to
+   --  poll for pending base priority changes at every abort completion
+   --  point. A value of False for Dynamic_Priority_Support corresponds
+   --  to pragma Restrictions (No_Dynamic_Priorities);
+
+   ---------------------
+   -- Task Attributes --
+   ---------------------
+
+   Default_Attribute_Count : constant := 4;
+   --  Number of pre-allocated Address-sized task attributes stored in the
+   --  task control block.
+
+   --------------------
+   -- Runtime Traces --
+   --------------------
+
+   Runtime_Traces : constant Boolean := False;
+   --  This constant indicates whether the runtime outputs traces to a
+   --  predefined output or not (True means that traces are output).
+   --  See System.Traces for more details.
+
+   ------------------------------
+   -- Exception Message Length --
+   ------------------------------
+
+   Default_Exception_Msg_Max_Length : constant := 512;
+   --  This constant specifies the maximum number of characters to allow in an
+   --  exception message (see RM 11.4.1(18)). The value for VMS exceeds the
+   --  default minimum of 200 to allow for the length of chained VMS condition
+   --  handling messages.
+
+end System.Parameters;