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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- S Y S T E M . M E M O R Y --
+-- --
+-- S p e c --
+-- --
+-- Copyright (C) 2001-2013, 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. --
+-- --
+------------------------------------------------------------------------------
+
+-- This package provides the low level memory allocation/deallocation
+-- mechanisms used by GNAT.
+
+-- To provide an alternate implementation, simply recompile the modified
+-- body of this package with gnatmake -u -a -g s-memory.adb and make sure
+-- 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_Warning;
+
+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;
+ -- 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);
+ -- 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;
+ -- 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
+
+ -- 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;