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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) 2001-2010, 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 for VMS 64 bit.
-
--- 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;
-
-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.
-
- function Alloc32 (Size : size_t) return System.Address;
- -- Equivalent to Alloc except on VMS 64 bit where it invokes
- -- 32 bit malloc.
-
- 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.
-
- function Realloc32
- (Ptr : System.Address;
- Size : size_t) return System.Address;
- -- Equivalent to Realloc except on VMS 64 bit where it invokes
- -- 32 bit realloc.
-
-private
-
- -- The following names are used from the generated compiler code
-
- pragma Export (C, Alloc, "__gnat_malloc");
- pragma Export (C, Alloc32, "__gnat_malloc32");
- pragma Export (C, Free, "__gnat_free");
- pragma Export (C, Realloc, "__gnat_realloc");
- pragma Export (C, Realloc32, "__gnat_realloc32");
-
- function C_malloc32 (Size : size_t) return System.Address;
- pragma Import (C, C_malloc32, "_malloc32");
- -- An alias for malloc for allocating 32bit memory on 64bit VMS
-
- function C_realloc32
- (Ptr : System.Address;
- Size : size_t) return System.Address;
- pragma Import (C, C_realloc32, "_realloc32");
- -- An alias for realloc for allocating 32bit memory on 64bit VMS
-
-end System.Memory;