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-------------------------------------------------------------------------------
--- --
--- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS --
--- --
--- S Y S T E M . B I T _ O P S --
--- --
--- B o d y --
--- --
--- Copyright (C) 1996-2010, Free Software Foundation, Inc. --
--- --
--- 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. --
--- --
-------------------------------------------------------------------------------
-
-pragma Compiler_Unit;
-
-with System; use System;
-with System.Unsigned_Types; use System.Unsigned_Types;
-
-with Ada.Exceptions; use Ada.Exceptions;
-with Ada.Unchecked_Conversion;
-
-package body System.Bit_Ops is
-
- subtype Bits_Array is System.Unsigned_Types.Packed_Bytes1 (Positive);
- -- Dummy array type used to interpret the address values. We use the
- -- unaligned version always, since this will handle both the aligned and
- -- unaligned cases, and we always do these operations by bytes anyway.
- -- Note: we use a ones origin array here so that the computations of the
- -- length in bytes work correctly (give a non-negative value) for the
- -- case of zero length bit strings). Note that we never allocate any
- -- objects of this type (we can't because they would be absurdly big).
-
- type Bits is access Bits_Array;
- -- This is the actual type into which address values are converted
-
- function To_Bits is new Ada.Unchecked_Conversion (Address, Bits);
-
- LE : constant := Standard'Default_Bit_Order;
- -- Static constant set to 0 for big-endian, 1 for little-endian
-
- -- The following is an array of masks used to mask the final byte, either
- -- at the high end (big-endian case) or the low end (little-endian case).
-
- Masks : constant array (1 .. 7) of Packed_Byte := (
- (1 - LE) * 2#1000_0000# + LE * 2#0000_0001#,
- (1 - LE) * 2#1100_0000# + LE * 2#0000_0011#,
- (1 - LE) * 2#1110_0000# + LE * 2#0000_0111#,
- (1 - LE) * 2#1111_0000# + LE * 2#0000_1111#,
- (1 - LE) * 2#1111_1000# + LE * 2#0001_1111#,
- (1 - LE) * 2#1111_1100# + LE * 2#0011_1111#,
- (1 - LE) * 2#1111_1110# + LE * 2#0111_1111#);
-
- -----------------------
- -- Local Subprograms --
- -----------------------
-
- procedure Raise_Error;
- pragma No_Return (Raise_Error);
- -- Raise Constraint_Error, complaining about unequal lengths
-
- -------------
- -- Bit_And --
- -------------
-
- procedure Bit_And
- (Left : Address;
- Llen : Natural;
- Right : Address;
- Rlen : Natural;
- Result : Address)
- is
- LeftB : constant Bits := To_Bits (Left);
- RightB : constant Bits := To_Bits (Right);
- ResultB : constant Bits := To_Bits (Result);
-
- begin
- if Llen /= Rlen then
- Raise_Error;
- end if;
-
- for J in 1 .. (Rlen + 7) / 8 loop
- ResultB (J) := LeftB (J) and RightB (J);
- end loop;
- end Bit_And;
-
- ------------
- -- Bit_Eq --
- ------------
-
- function Bit_Eq
- (Left : Address;
- Llen : Natural;
- Right : Address;
- Rlen : Natural) return Boolean
- is
- LeftB : constant Bits := To_Bits (Left);
- RightB : constant Bits := To_Bits (Right);
-
- begin
- if Llen /= Rlen then
- return False;
-
- else
- declare
- BLen : constant Natural := Llen / 8;
- Bitc : constant Natural := Llen mod 8;
-
- begin
- if LeftB (1 .. BLen) /= RightB (1 .. BLen) then
- return False;
-
- elsif Bitc /= 0 then
- return
- ((LeftB (BLen + 1) xor RightB (BLen + 1))
- and Masks (Bitc)) = 0;
-
- else -- Bitc = 0
- return True;
- end if;
- end;
- end if;
- end Bit_Eq;
-
- -------------
- -- Bit_Not --
- -------------
-
- procedure Bit_Not
- (Opnd : System.Address;
- Len : Natural;
- Result : System.Address)
- is
- OpndB : constant Bits := To_Bits (Opnd);
- ResultB : constant Bits := To_Bits (Result);
-
- begin
- for J in 1 .. (Len + 7) / 8 loop
- ResultB (J) := not OpndB (J);
- end loop;
- end Bit_Not;
-
- ------------
- -- Bit_Or --
- ------------
-
- procedure Bit_Or
- (Left : Address;
- Llen : Natural;
- Right : Address;
- Rlen : Natural;
- Result : Address)
- is
- LeftB : constant Bits := To_Bits (Left);
- RightB : constant Bits := To_Bits (Right);
- ResultB : constant Bits := To_Bits (Result);
-
- begin
- if Llen /= Rlen then
- Raise_Error;
- end if;
-
- for J in 1 .. (Rlen + 7) / 8 loop
- ResultB (J) := LeftB (J) or RightB (J);
- end loop;
- end Bit_Or;
-
- -------------
- -- Bit_Xor --
- -------------
-
- procedure Bit_Xor
- (Left : Address;
- Llen : Natural;
- Right : Address;
- Rlen : Natural;
- Result : Address)
- is
- LeftB : constant Bits := To_Bits (Left);
- RightB : constant Bits := To_Bits (Right);
- ResultB : constant Bits := To_Bits (Result);
-
- begin
- if Llen /= Rlen then
- Raise_Error;
- end if;
-
- for J in 1 .. (Rlen + 7) / 8 loop
- ResultB (J) := LeftB (J) xor RightB (J);
- end loop;
- end Bit_Xor;
-
- -----------------
- -- Raise_Error --
- -----------------
-
- procedure Raise_Error is
- begin
- Raise_Exception
- (Constraint_Error'Identity, "operand lengths are unequal");
- end Raise_Error;
-
-end System.Bit_Ops;