Mercurial > hg > CbC > CbC_gcc
comparison gcc/ada/libgnat/s-addope.ads @ 111:04ced10e8804
gcc 7
| author | kono |
|---|---|
| date | Fri, 27 Oct 2017 22:46:09 +0900 |
| parents | |
| children | 84e7813d76e9 |
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| 68:561a7518be6b | 111:04ced10e8804 |
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| 1 ------------------------------------------------------------------------------ | |
| 2 -- -- | |
| 3 -- GNAT COMPILER COMPONENTS -- | |
| 4 -- -- | |
| 5 -- S Y S T E M . A D D R E S S _ O P E R A T I O N S -- | |
| 6 -- -- | |
| 7 -- S p e c -- | |
| 8 -- -- | |
| 9 -- Copyright (C) 2004-2017, Free Software Foundation, Inc. -- | |
| 10 -- -- | |
| 11 -- GNAT is free software; you can redistribute it and/or modify it under -- | |
| 12 -- terms of the GNU General Public License as published by the Free Soft- -- | |
| 13 -- ware Foundation; either version 3, or (at your option) any later ver- -- | |
| 14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- -- | |
| 15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY -- | |
| 16 -- or FITNESS FOR A PARTICULAR PURPOSE. -- | |
| 17 -- -- | |
| 18 -- As a special exception under Section 7 of GPL version 3, you are granted -- | |
| 19 -- additional permissions described in the GCC Runtime Library Exception, -- | |
| 20 -- version 3.1, as published by the Free Software Foundation. -- | |
| 21 -- -- | |
| 22 -- You should have received a copy of the GNU General Public License and -- | |
| 23 -- a copy of the GCC Runtime Library Exception along with this program; -- | |
| 24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see -- | |
| 25 -- <http://www.gnu.org/licenses/>. -- | |
| 26 -- -- | |
| 27 -- GNAT was originally developed by the GNAT team at New York University. -- | |
| 28 -- Extensive contributions were provided by Ada Core Technologies Inc. -- | |
| 29 -- -- | |
| 30 ------------------------------------------------------------------------------ | |
| 31 | |
| 32 -- This package provides arithmetic and logical operations on type Address. | |
| 33 -- It is intended for use by other packages in the System hierarchy. For | |
| 34 -- applications requiring this capability, see System.Storage_Elements or | |
| 35 -- the operations introduced in System.Aux_DEC; | |
| 36 | |
| 37 -- The reason we need this package is that arithmetic operations may not | |
| 38 -- be available in the case where type Address is non-private and the | |
| 39 -- operations have been made abstract in the spec of System (to avoid | |
| 40 -- inappropriate use by applications programs). In addition, the logical | |
| 41 -- operations may not be available if type Address is a signed integer. | |
| 42 | |
| 43 pragma Compiler_Unit_Warning; | |
| 44 | |
| 45 package System.Address_Operations is | |
| 46 pragma Pure; | |
| 47 | |
| 48 -- The semantics of the arithmetic operations are those that apply to | |
| 49 -- a modular type with the same length as Address, i.e. they provide | |
| 50 -- twos complement wrap around arithmetic treating the address value | |
| 51 -- as an unsigned value, with no overflow checking. | |
| 52 | |
| 53 -- Note that we do not use the infix names for these operations to | |
| 54 -- avoid problems with ambiguities coming from declarations in package | |
| 55 -- Standard (which may or may not be visible depending on the exact | |
| 56 -- form of the declaration of type System.Address). | |
| 57 | |
| 58 -- For addition, subtraction, and multiplication, the effect of overflow | |
| 59 -- is 2's complement wrapping (as though the type Address were unsigned). | |
| 60 | |
| 61 -- For division and modulus operations, the caller is responsible for | |
| 62 -- ensuring that the Right argument is non-zero, and the effect of the | |
| 63 -- call is not specified if a zero argument is passed. | |
| 64 | |
| 65 function AddA (Left, Right : Address) return Address; | |
| 66 function SubA (Left, Right : Address) return Address; | |
| 67 function MulA (Left, Right : Address) return Address; | |
| 68 function DivA (Left, Right : Address) return Address; | |
| 69 function ModA (Left, Right : Address) return Address; | |
| 70 | |
| 71 -- The semantics of the logical operations are those that apply to | |
| 72 -- a modular type with the same length as Address, i.e. they provide | |
| 73 -- bit-wise operations on all bits of the value (including the sign | |
| 74 -- bit if Address is a signed integer type). | |
| 75 | |
| 76 function AndA (Left, Right : Address) return Address; | |
| 77 function OrA (Left, Right : Address) return Address; | |
| 78 | |
| 79 pragma Inline_Always (AddA); | |
| 80 pragma Inline_Always (SubA); | |
| 81 pragma Inline_Always (MulA); | |
| 82 pragma Inline_Always (DivA); | |
| 83 pragma Inline_Always (ModA); | |
| 84 pragma Inline_Always (AndA); | |
| 85 pragma Inline_Always (OrA); | |
| 86 | |
| 87 end System.Address_Operations; |