| ------------------------------------------------------------------------------ |
| -- -- |
| -- GNAT COMPILER COMPONENTS -- |
| -- -- |
| -- S Y S T E M . B I G N U M S -- |
| -- -- |
| -- B o d y -- |
| -- -- |
| -- Copyright (C) 2012-2021, 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. -- |
| -- -- |
| ------------------------------------------------------------------------------ |
| |
| with Ada.Unchecked_Conversion; |
| with System.Generic_Bignums; |
| with System.Secondary_Stack; use System.Secondary_Stack; |
| with System.Shared_Bignums; use System.Shared_Bignums; |
| with System.Storage_Elements; use System.Storage_Elements; |
| |
| package body System.Bignums is |
| |
| function Allocate_Bignum (D : Digit_Vector; Neg : Boolean) return Bignum; |
| -- Allocate Bignum value with the given contents |
| |
| procedure Free_Bignum (X : in out Bignum) is null; |
| -- No op when using the secondary stack |
| |
| function To_Bignum (X : aliased in out Bignum) return Bignum is (X); |
| |
| --------------------- |
| -- Allocate_Bignum -- |
| --------------------- |
| |
| function Allocate_Bignum (D : Digit_Vector; Neg : Boolean) return Bignum is |
| Addr : aliased Address; |
| begin |
| -- Note: The approach used here is designed to avoid strict aliasing |
| -- warnings that appeared previously using unchecked conversion. |
| |
| SS_Allocate (Addr, Storage_Offset (4 + 4 * D'Length)); |
| |
| declare |
| B : Bignum; |
| for B'Address use Addr'Address; |
| pragma Import (Ada, B); |
| |
| BD : Bignum_Data (D'Length); |
| for BD'Address use Addr; |
| pragma Import (Ada, BD); |
| |
| -- Expose a writable view of discriminant BD.Len so that we can |
| -- initialize it. We need to use the exact layout of the record |
| -- to ensure that the Length field has 24 bits as expected. |
| |
| type Bignum_Data_Header is record |
| Len : Length; |
| Neg : Boolean; |
| end record; |
| |
| for Bignum_Data_Header use record |
| Len at 0 range 0 .. 23; |
| Neg at 3 range 0 .. 7; |
| end record; |
| |
| BDH : Bignum_Data_Header; |
| for BDH'Address use BD'Address; |
| pragma Import (Ada, BDH); |
| |
| pragma Assert (BDH.Len'Size = BD.Len'Size); |
| |
| begin |
| BDH.Len := D'Length; |
| BDH.Neg := Neg; |
| B.D := D; |
| return B; |
| end; |
| end Allocate_Bignum; |
| |
| package Sec_Stack_Bignums is new System.Generic_Bignums |
| (Bignum, Allocate_Bignum, Free_Bignum, To_Bignum); |
| |
| function Big_Add (X, Y : Bignum) return Bignum |
| renames Sec_Stack_Bignums.Big_Add; |
| |
| function Big_Sub (X, Y : Bignum) return Bignum |
| renames Sec_Stack_Bignums.Big_Sub; |
| |
| function Big_Mul (X, Y : Bignum) return Bignum |
| renames Sec_Stack_Bignums.Big_Mul; |
| |
| function Big_Div (X, Y : Bignum) return Bignum |
| renames Sec_Stack_Bignums.Big_Div; |
| |
| function Big_Exp (X, Y : Bignum) return Bignum |
| renames Sec_Stack_Bignums.Big_Exp; |
| |
| function Big_Mod (X, Y : Bignum) return Bignum |
| renames Sec_Stack_Bignums.Big_Mod; |
| |
| function Big_Rem (X, Y : Bignum) return Bignum |
| renames Sec_Stack_Bignums.Big_Rem; |
| |
| function Big_Neg (X : Bignum) return Bignum |
| renames Sec_Stack_Bignums.Big_Neg; |
| |
| function Big_Abs (X : Bignum) return Bignum |
| renames Sec_Stack_Bignums.Big_Abs; |
| |
| function Big_EQ (X, Y : Bignum) return Boolean |
| renames Sec_Stack_Bignums.Big_EQ; |
| function Big_NE (X, Y : Bignum) return Boolean |
| renames Sec_Stack_Bignums.Big_NE; |
| function Big_GE (X, Y : Bignum) return Boolean |
| renames Sec_Stack_Bignums.Big_GE; |
| function Big_LE (X, Y : Bignum) return Boolean |
| renames Sec_Stack_Bignums.Big_LE; |
| function Big_GT (X, Y : Bignum) return Boolean |
| renames Sec_Stack_Bignums.Big_GT; |
| function Big_LT (X, Y : Bignum) return Boolean |
| renames Sec_Stack_Bignums.Big_LT; |
| |
| function Bignum_In_LLI_Range (X : Bignum) return Boolean |
| renames Sec_Stack_Bignums.Bignum_In_LLI_Range; |
| |
| function To_Bignum (X : Long_Long_Integer) return Bignum |
| renames Sec_Stack_Bignums.To_Bignum; |
| |
| function From_Bignum (X : Bignum) return Long_Long_Integer |
| renames Sec_Stack_Bignums.From_Bignum; |
| |
| end System.Bignums; |
