73 lines
4.4 KiB
Ada
73 lines
4.4 KiB
Ada
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------------------------------------------------------------------------------
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-- --
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-- GNAT RUN-TIME COMPONENTS --
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-- --
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-- S Y S T E M . M E M O R Y _ C O P Y --
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-- --
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-- S p e c --
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-- --
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-- Copyright (C) 2001-2014, Free Software Foundation, Inc. --
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-- --
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-- This specification is derived from the Ada Reference Manual for use with --
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-- GNAT. The copyright notice above, and the license provisions that follow --
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-- apply solely to the contents of the part following the private keyword. --
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-- --
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-- GNAT is free software; you can redistribute it and/or modify it under --
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-- terms of the GNU General Public License as published by the Free Soft- --
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-- ware Foundation; either version 3, or (at your option) any later ver- --
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-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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-- or FITNESS FOR A PARTICULAR PURPOSE. --
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-- --
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-- As a special exception under Section 7 of GPL version 3, you are granted --
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-- additional permissions described in the GCC Runtime Library Exception, --
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-- version 3.1, as published by the Free Software Foundation. --
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-- --
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-- You should have received a copy of the GNU General Public License and --
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-- a copy of the GCC Runtime Library Exception along with this program; --
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-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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-- <http://www.gnu.org/licenses/>. --
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-- --
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-- GNAT was originally developed by the GNAT team at New York University. --
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-- Extensive contributions were provided by Ada Core Technologies Inc. --
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-- --
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------------------------------------------------------------------------------
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-- This package provides general block copy mechanisms analogous to those
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-- provided by the C routines memcpy and memmove allowing for copies with
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-- and without possible overlap of the operands.
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-- The idea is to allow a configurable run-time to provide this capability
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-- for use by the compiler without dragging in C-run time routines.
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with System.CRTL;
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-- The above with is contrary to the intent ???
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package System.Memory_Copy is
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pragma Preelaborate;
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procedure memcpy (S1 : Address; S2 : Address; N : System.CRTL.size_t)
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renames System.CRTL.memcpy;
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-- Copies N storage units from area starting at S2 to area starting
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-- at S1 without any check for buffer overflow. The memory areas
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-- must not overlap, or the result of this call is undefined.
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procedure memmove (S1 : Address; S2 : Address; N : System.CRTL.size_t)
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renames System.CRTL.memmove;
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-- Copies N storage units from area starting at S2 to area starting
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-- at S1 without any check for buffer overflow. The difference between
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-- this memmove and memcpy is that with memmove, the storage areas may
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-- overlap (forwards or backwards) and the result is correct (i.e. it
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-- is as if S2 is first moved to a temporary area, and then this area
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-- is copied to S1 in a separate step).
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-- In the standard library, these are just interfaced to the C routines.
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-- But in the HI-E (high integrity version) they may be reprogrammed to
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-- meet certification requirements (and marked High_Integrity).
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-- Note that in high integrity mode these routines are by default not
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-- available, and the HI-E compiler will as a result generate implicit
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-- loops (which will violate the restriction No_Implicit_Loops).
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end System.Memory_Copy;
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