aboutsummaryrefslogtreecommitdiffstats
path: root/gcc-4.8.3/gcc/ada/s-memcop.ads
diff options
context:
space:
mode:
Diffstat (limited to 'gcc-4.8.3/gcc/ada/s-memcop.ads')
-rw-r--r--gcc-4.8.3/gcc/ada/s-memcop.ads72
1 files changed, 72 insertions, 0 deletions
diff --git a/gcc-4.8.3/gcc/ada/s-memcop.ads b/gcc-4.8.3/gcc/ada/s-memcop.ads
new file mode 100644
index 000000000..96219f1e1
--- /dev/null
+++ b/gcc-4.8.3/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;