-- --
-- S p e c --
-- --
--- --
--- Copyright (C) 2001 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. --
+-- Copyright (C) 2001-2009, 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 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 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. --
-- --
--- 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. --
+-- 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. --
--- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
+-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- that the ali and object files for this unit are found in the object
-- search path.
+-- This unit may be used directly from an application program by providing
+-- an appropriate WITH, and the interface can be expected to remain stable.
+
+pragma Compiler_Unit;
+
package System.Memory is
pragma Elaborate_Body;
type size_t is mod 2 ** Standard'Address_Size;
+ -- Note: the reason we redefine this here instead of using the
+ -- definition in Interfaces.C is that we do not want to drag in
+ -- all of Interfaces.C just because System.Memory is used.
function Alloc (Size : size_t) return System.Address;
- -- malloc for use by GNAT, with error checking and task lockout,
- -- as well as allocation tracking.
+ -- This is the low level allocation routine. Given a size in storage
+ -- units, it returns the address of a maximally aligned block of
+ -- memory. The implementation of this routine is guaranteed to be
+ -- task safe, and also aborts are deferred if necessary.
+ --
+ -- If size_t is set to size_t'Last on entry, then a Storage_Error
+ -- exception is raised with a message "object too large".
+ --
+ -- If size_t is set to zero on entry, then a minimal (but non-zero)
+ -- size block is allocated.
+ --
+ -- Note: this is roughly equivalent to the standard C malloc call
+ -- with the additional semantics as described above.
procedure Free (Ptr : System.Address);
- -- free for use by GNAT, with task lockout and allocation tracking.
+ -- This is the low level free routine. It frees a block previously
+ -- allocated with a call to Alloc. As in the case of Alloc, this
+ -- call is guaranteed task safe, and aborts are deferred.
+ --
+ -- Note: this is roughly equivalent to the standard C free call
+ -- with the additional semantics as described above.
function Realloc
(Ptr : System.Address;
- Size : size_t)
- return System.Address;
- -- realloc for use by GNAT, with error checking and task lockout.
+ Size : size_t) return System.Address;
+ -- This is the low level reallocation routine. It takes an existing
+ -- block address returned by a previous call to Alloc or Realloc,
+ -- and reallocates the block. The size can either be increased or
+ -- decreased. If possible the reallocation is done in place, so that
+ -- the returned result is the same as the value of Ptr on entry.
+ -- However, it may be necessary to relocate the block to another
+ -- address, in which case the information is copied to the new
+ -- block, and the old block is freed. The implementation of this
+ -- routine is guaranteed to be task safe, and also aborts are
+ -- deferred as necessary.
+ --
+ -- If size_t is set to size_t'Last on entry, then a Storage_Error
+ -- exception is raised with a message "object too large".
+ --
+ -- If size_t is set to zero on entry, then a minimal (but non-zero)
+ -- size block is allocated.
+ --
+ -- Note: this is roughly equivalent to the standard C realloc call
+ -- with the additional semantics as described above.
private
- pragma Export (C, Alloc, "__gnat_malloc");
- pragma Export (C, Free, "__gnat_free");
+ -- The following names are used from the generated compiler code
+
+ pragma Export (C, Alloc, "__gnat_malloc");
+ pragma Export (C, Free, "__gnat_free");
pragma Export (C, Realloc, "__gnat_realloc");
end System.Memory;
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