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Diffstat (limited to 'src/lib/gnat/s-stoele.adb')
| -rw-r--r-- | src/lib/gnat/s-stoele.adb | 131 |
1 files changed, 131 insertions, 0 deletions
diff --git a/src/lib/gnat/s-stoele.adb b/src/lib/gnat/s-stoele.adb new file mode 100644 index 0000000000..1cb5f92a23 --- /dev/null +++ b/src/lib/gnat/s-stoele.adb @@ -0,0 +1,131 @@ +------------------------------------------------------------------------------ +-- -- +-- GNAT COMPILER COMPONENTS -- +-- -- +-- S Y S T E M . S T O R A G E _ E L E M E N T S -- +-- -- +-- B o d y -- +-- -- +-- Copyright (C) 1992-2014, 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_Warning; + +with Ada.Unchecked_Conversion; + +package body System.Storage_Elements is + + pragma Suppress (All_Checks); + + -- Conversion to/from address + + -- Note qualification below of To_Address to avoid ambiguities systems + -- where Address is a visible integer type. + + function To_Address is + new Ada.Unchecked_Conversion (Storage_Offset, Address); + function To_Offset is + new Ada.Unchecked_Conversion (Address, Storage_Offset); + + -- Conversion to/from integers + + -- These functions must be place first because they are inlined_always + -- and are used and inlined in other subprograms defined in this unit. + + ---------------- + -- To_Address -- + ---------------- + + function To_Address (Value : Integer_Address) return Address is + begin + return Address (Value); + end To_Address; + + ---------------- + -- To_Integer -- + ---------------- + + function To_Integer (Value : Address) return Integer_Address is + begin + return Integer_Address (Value); + end To_Integer; + + -- Address arithmetic + + --------- + -- "+" -- + --------- + + function "+" (Left : Address; Right : Storage_Offset) return Address is + begin + return Storage_Elements.To_Address + (To_Integer (Left) + To_Integer (To_Address (Right))); + end "+"; + + function "+" (Left : Storage_Offset; Right : Address) return Address is + begin + return Storage_Elements.To_Address + (To_Integer (To_Address (Left)) + To_Integer (Right)); + end "+"; + + --------- + -- "-" -- + --------- + + function "-" (Left : Address; Right : Storage_Offset) return Address is + begin + return Storage_Elements.To_Address + (To_Integer (Left) - To_Integer (To_Address (Right))); + end "-"; + + function "-" (Left, Right : Address) return Storage_Offset is + begin + return To_Offset (Storage_Elements.To_Address + (To_Integer (Left) - To_Integer (Right))); + end "-"; + + ----------- + -- "mod" -- + ----------- + + function "mod" + (Left : Address; + Right : Storage_Offset) return Storage_Offset + is + begin + if Right > 0 then + return Storage_Offset + (To_Integer (Left) mod Integer_Address (Right)); + + -- The negative case makes no sense since it is a case of a mod where + -- the left argument is unsigned and the right argument is signed. In + -- accordance with the (spirit of the) permission of RM 13.7.1(16), + -- we raise CE, and also include the zero case here. Yes, the RM says + -- PE, but this really is so obviously more like a constraint error. + + else + raise Constraint_Error; + end if; + end "mod"; + +end System.Storage_Elements; |