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Diffstat (limited to 'gcc/ada/s-memcop.ads')
| -rw-r--r-- | gcc/ada/s-memcop.ads | 76 |
1 files changed, 76 insertions, 0 deletions
diff --git a/gcc/ada/s-memcop.ads b/gcc/ada/s-memcop.ads new file mode 100644 index 00000000000..d71d48f17ca --- /dev/null +++ b/gcc/ada/s-memcop.ads @@ -0,0 +1,76 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUN-TIME COMPONENTS -- +-- -- +-- S Y S T E M . M E M O R Y _ C O P Y -- +-- -- +-- S p e c -- +-- -- +-- Copyright (C) 2001-2002 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 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, 59 Temple Place - Suite 330, Boston, -- +-- MA 02111-1307, 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 package provides general block copy mechanisms analgous to those +-- provided by the C routines memcpy and memmove allowing for copies with +-- and without possible overflow. + +package System.Memory_Copy is +pragma Preelaborate; + + 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_Copy is used. + + procedure memcpy (S1 : Address; S2 : Address; N : size_t); + -- Copies N storage units from area starting at S2 to area starting + -- at S1 without any check for buffer overflow. The memory areas + -- must not overlap, or the result of this call is undefined. + + procedure memmove (S1 : Address; S2 : Address; N : size_t); + -- Copies N storage units from area starting at S2 to area starting + -- at S1 without any check for buffer overflow. The difference between + -- this memmove and memcpy is that with memmove, the storage areas may + -- overlap (forwards or backwards) and the result is correct (i.e. it + -- is as if S2 is first moved to a temporary area, and then this area + -- is copied to S1 in a separate step). + +private + + -- In the standard library, these are just interfaced to the C routines. + -- But in the HI-E (high integrity version) they may be reprogrammed to + -- meet certification requirements (and marked High_Integrity). + + -- Note that in high integrity mode these routines are by default not + -- available, and the HI-E compiler will as a result generate implicit + -- loops (which will violate the restriction No_Implicit_Loops). + + pragma Import (C, memcpy, "memcpy"); + pragma Import (C, memmove, "memmove"); + +end System.Memory_Copy; |