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gcc-9.2.0
author anatofuz
date Thu, 13 Feb 2020 11:34:05 +0900
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1 ------------------------------------------------------------------------------
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2 -- --
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3 -- GNAT RUN-TIME COMPONENTS --
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4 -- --
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5 -- S Y S T E M . B I T F I E L D _ U T I L S --
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6 -- --
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7 -- S p e c --
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8 -- --
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9 -- Copyright (C) 2019, Free Software Foundation, Inc. --
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10 -- --
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11 -- GNAT is free software; you can redistribute it and/or modify it under --
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12 -- terms of the GNU General Public License as published by the Free Soft- --
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13 -- ware Foundation; either version 3, or (at your option) any later ver- --
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14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
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15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
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16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
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17 -- --
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18 -- As a special exception under Section 7 of GPL version 3, you are granted --
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19 -- additional permissions described in the GCC Runtime Library Exception, --
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20 -- version 3.1, as published by the Free Software Foundation. --
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21 -- --
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22 -- You should have received a copy of the GNU General Public License and --
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23 -- a copy of the GCC Runtime Library Exception along with this program; --
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24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
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25 -- <http://www.gnu.org/licenses/>. --
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26 -- --
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27 -- GNAT was originally developed by the GNAT team at New York University. --
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28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
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29 -- --
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30 ------------------------------------------------------------------------------
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31
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32 with System.Bitfield_Utils;
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33
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34 package System.Bitfields is
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35
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36 -- Instances of the generic package in System.Bitfield_Utils. So far
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37 -- we have just one, which defaults to the natural endianness of the
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38 -- machine. We might someday want to support Scalar_Storage_Order.
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39 -- Note: we use Long_Long_Integer'Size / 2 instead of 32 to support
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40 -- specifying a target configuration file where the largest integer is
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41 -- 32 bits instead of 64.
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42
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43 Val_Bits : constant := Long_Long_Integer'Size / 2;
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44 Val_Bytes : constant := Val_Bits / System.Storage_Unit;
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45
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46 type Val_2 is mod 2**(Val_Bits * 2) with Alignment => Val_Bytes;
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47 pragma Provide_Shift_Operators (Val_2);
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48 type Val is mod 2**Val_Bits with Alignment => Val_Bytes;
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49
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50 package Utils is new System.Bitfield_Utils.G (Val, Val_2);
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51
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52 procedure Copy_Bitfield
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53 (Src_Address : Address;
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54 Src_Offset : Utils.Bit_Offset_In_Byte;
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55 Dest_Address : Address;
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56 Dest_Offset : Utils.Bit_Offset_In_Byte;
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57 Size : Utils.Bit_Size)
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58 renames Utils.Copy_Bitfield;
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59
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60 end System.Bitfields;