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Diffstat (limited to 'gcc/ada/libgnat/s-bitops.ads')
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1 files changed, 99 insertions, 0 deletions
diff --git a/gcc/ada/libgnat/s-bitops.ads b/gcc/ada/libgnat/s-bitops.ads new file mode 100644 index 0000000..1b6b3ba --- /dev/null +++ b/gcc/ada/libgnat/s-bitops.ads @@ -0,0 +1,99 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT RUN-TIME LIBRARY (GNARL) COMPONENTS -- +-- -- +-- S Y S T E M . B I T _ O P S -- +-- -- +-- S p e c -- +-- -- +-- Copyright (C) 1992-2017, 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. -- +-- -- +------------------------------------------------------------------------------ + +-- Operations on packed bit strings + +pragma Compiler_Unit_Warning; + +with System; + +package System.Bit_Ops is + + -- Note: in all the following routines, the System.Address parameters + -- represent the address of the first byte of an array used to represent + -- a packed array (of type System.Unsigned_Types.Packed_Bytes{1,2,4}) + -- The length in bits is passed as a separate parameter. Note that all + -- addresses must be of byte aligned arrays. + + procedure Bit_And + (Left : System.Address; + Llen : Natural; + Right : System.Address; + Rlen : Natural; + Result : System.Address); + -- Bitwise "and" of given bit string with result being placed in Result. + -- The and operation is allowed to destroy unused bits in the last byte, + -- i.e. to leave them set in an undefined manner. Note that Left, Right + -- and Result always have the same length in bits (Len). + + function Bit_Eq + (Left : System.Address; + Llen : Natural; + Right : System.Address; + Rlen : Natural) return Boolean; + -- Left and Right are the addresses of two bit packed arrays with Llen + -- and Rlen being the respective length in bits. The routine compares the + -- two bit strings for equality, being careful not to include the unused + -- bits in the final byte. Note that the result is always False if Rlen + -- is not equal to Llen. + + procedure Bit_Not + (Opnd : System.Address; + Len : Natural; + Result : System.Address); + -- Bitwise "not" of given bit string with result being placed in Result. + -- The not operation is allowed to destroy unused bits in the last byte, + -- i.e. to leave them set in an undefined manner. Note that Result and + -- Opnd always have the same length in bits (Len). + + procedure Bit_Or + (Left : System.Address; + Llen : Natural; + Right : System.Address; + Rlen : Natural; + Result : System.Address); + -- Bitwise "or" of given bit string with result being placed in Result. + -- The or operation is allowed to destroy unused bits in the last byte, + -- i.e. to leave them set in an undefined manner. Note that Left, Right + -- and Result always have the same length in bits (Len). + + procedure Bit_Xor + (Left : System.Address; + Llen : Natural; + Right : System.Address; + Rlen : Natural; + Result : System.Address); + -- Bitwise "xor" of given bit string with result being placed in Result. + -- The xor operation is allowed to destroy unused bits in the last byte, + -- i.e. to leave them set in an undefined manner. Note that Left, Right + -- and Result always have the same length in bits (Len). + +end System.Bit_Ops; |