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Diffstat (limited to 'gcc/ada/s-memcop.ads')
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1 files changed, 72 insertions, 0 deletions
diff --git a/gcc/ada/s-memcop.ads b/gcc/ada/s-memcop.ads new file mode 100644 index 000000000..96219f1e1 --- /dev/null +++ b/gcc/ada/s-memcop.ads @@ -0,0 +1,72 @@ +------------------------------------------------------------------------------ +-- -- +-- 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) 2001-2009 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 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 general block copy mechanisms analogous to those +-- provided by the C routines memcpy and memmove allowing for copies with +-- and without possible overlap of the operands. + +-- The idea is to allow a configurable run-time to provide this capability +-- for use by the compiler without dragging in C-run time routines. + +with System.CRTL; +-- The above with is contrary to the intent ??? + +package System.Memory_Copy is + pragma Preelaborate; + + procedure memcpy (S1 : Address; S2 : Address; N : System.CRTL.size_t) + renames System.CRTL.memcpy; + -- 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 : System.CRTL.size_t) + renames System.CRTL.memmove; + -- 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). + + -- 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). + +end System.Memory_Copy; |