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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S Y S T E M . A U X _ D E C --
-- --
-- B o d y --
-- --
-- Copyright (C) 1992-2022, 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 Style_Checks (All_Checks);
-- Turn off alpha ordering check on subprograms, this unit is laid
-- out to correspond to the declarations in the DEC 83 System unit.
with System.Soft_Links;
package body System.Aux_DEC is
package SSL renames System.Soft_Links;
-----------------------------------
-- Operations on Largest_Integer --
-----------------------------------
-- It would be nice to replace these with intrinsics, but that does
-- not work yet (the back end would be ok, but GNAT itself objects)
type LIU is mod 2 ** Largest_Integer'Size;
-- Unsigned type of same length as Largest_Integer
function To_LI is new Ada.Unchecked_Conversion (LIU, Largest_Integer);
function From_LI is new Ada.Unchecked_Conversion (Largest_Integer, LIU);
function "not" (Left : Largest_Integer) return Largest_Integer is
begin
return To_LI (not From_LI (Left));
end "not";
function "and" (Left, Right : Largest_Integer) return Largest_Integer is
begin
return To_LI (From_LI (Left) and From_LI (Right));
end "and";
function "or" (Left, Right : Largest_Integer) return Largest_Integer is
begin
return To_LI (From_LI (Left) or From_LI (Right));
end "or";
function "xor" (Left, Right : Largest_Integer) return Largest_Integer is
begin
return To_LI (From_LI (Left) xor From_LI (Right));
end "xor";
--------------------------------------
-- Arithmetic Operations on Address --
--------------------------------------
-- It would be nice to replace these with intrinsics, but that does
-- not work yet (the back end would be ok, but GNAT itself objects)
Asiz : constant Integer := Integer (Address'Size) - 1;
type SA is range -(2 ** Asiz) .. 2 ** Asiz - 1;
-- Signed type of same size as Address
function To_A is new Ada.Unchecked_Conversion (SA, Address);
function From_A is new Ada.Unchecked_Conversion (Address, SA);
function "+" (Left : Address; Right : Integer) return Address is
begin
return To_A (From_A (Left) + SA (Right));
end "+";
function "+" (Left : Integer; Right : Address) return Address is
begin
return To_A (SA (Left) + From_A (Right));
end "+";
function "-" (Left : Address; Right : Address) return Integer is
pragma Unsuppress (All_Checks);
-- Because this can raise Constraint_Error for 64-bit addresses
begin
return Integer (From_A (Left) - From_A (Right));
end "-";
function "-" (Left : Address; Right : Integer) return Address is
begin
return To_A (From_A (Left) - SA (Right));
end "-";
------------------------
-- Fetch_From_Address --
------------------------
function Fetch_From_Address (A : Address) return Target is
type T_Ptr is access all Target;
function To_T_Ptr is new Ada.Unchecked_Conversion (Address, T_Ptr);
Ptr : constant T_Ptr := To_T_Ptr (A);
begin
return Ptr.all;
end Fetch_From_Address;
-----------------------
-- Assign_To_Address --
-----------------------
procedure Assign_To_Address (A : Address; T : Target) is
type T_Ptr is access all Target;
function To_T_Ptr is new Ada.Unchecked_Conversion (Address, T_Ptr);
Ptr : constant T_Ptr := To_T_Ptr (A);
begin
Ptr.all := T;
end Assign_To_Address;
---------------------------------
-- Operations on Unsigned_Byte --
---------------------------------
-- It would be nice to replace these with intrinsics, but that does
-- not work yet (the back end would be ok, but GNAT itself objects)
type BU is mod 2 ** Unsigned_Byte'Size;
-- Unsigned type of same length as Unsigned_Byte
function To_B is new Ada.Unchecked_Conversion (BU, Unsigned_Byte);
function From_B is new Ada.Unchecked_Conversion (Unsigned_Byte, BU);
function "not" (Left : Unsigned_Byte) return Unsigned_Byte is
begin
return To_B (not From_B (Left));
end "not";
function "and" (Left, Right : Unsigned_Byte) return Unsigned_Byte is
begin
return To_B (From_B (Left) and From_B (Right));
end "and";
function "or" (Left, Right : Unsigned_Byte) return Unsigned_Byte is
begin
return To_B (From_B (Left) or From_B (Right));
end "or";
function "xor" (Left, Right : Unsigned_Byte) return Unsigned_Byte is
begin
return To_B (From_B (Left) xor From_B (Right));
end "xor";
---------------------------------
-- Operations on Unsigned_Word --
---------------------------------
-- It would be nice to replace these with intrinsics, but that does
-- not work yet (the back end would be ok, but GNAT itself objects)
type WU is mod 2 ** Unsigned_Word'Size;
-- Unsigned type of same length as Unsigned_Word
function To_W is new Ada.Unchecked_Conversion (WU, Unsigned_Word);
function From_W is new Ada.Unchecked_Conversion (Unsigned_Word, WU);
function "not" (Left : Unsigned_Word) return Unsigned_Word is
begin
return To_W (not From_W (Left));
end "not";
function "and" (Left, Right : Unsigned_Word) return Unsigned_Word is
begin
return To_W (From_W (Left) and From_W (Right));
end "and";
function "or" (Left, Right : Unsigned_Word) return Unsigned_Word is
begin
return To_W (From_W (Left) or From_W (Right));
end "or";
function "xor" (Left, Right : Unsigned_Word) return Unsigned_Word is
begin
return To_W (From_W (Left) xor From_W (Right));
end "xor";
-------------------------------------
-- Operations on Unsigned_Longword --
-------------------------------------
-- It would be nice to replace these with intrinsics, but that does
-- not work yet (the back end would be ok, but GNAT itself objects)
type LWU is mod 2 ** Unsigned_Longword'Size;
-- Unsigned type of same length as Unsigned_Longword
function To_LW is new Ada.Unchecked_Conversion (LWU, Unsigned_Longword);
function From_LW is new Ada.Unchecked_Conversion (Unsigned_Longword, LWU);
function "not" (Left : Unsigned_Longword) return Unsigned_Longword is
begin
return To_LW (not From_LW (Left));
end "not";
function "and" (Left, Right : Unsigned_Longword) return Unsigned_Longword is
begin
return To_LW (From_LW (Left) and From_LW (Right));
end "and";
function "or" (Left, Right : Unsigned_Longword) return Unsigned_Longword is
begin
return To_LW (From_LW (Left) or From_LW (Right));
end "or";
function "xor" (Left, Right : Unsigned_Longword) return Unsigned_Longword is
begin
return To_LW (From_LW (Left) xor From_LW (Right));
end "xor";
-------------------------------
-- Operations on Unsigned_32 --
-------------------------------
-- It would be nice to replace these with intrinsics, but that does
-- not work yet (the back end would be ok, but GNAT itself objects)
type U32 is mod 2 ** Unsigned_32'Size;
-- Unsigned type of same length as Unsigned_32
function To_U32 is new Ada.Unchecked_Conversion (U32, Unsigned_32);
function From_U32 is new Ada.Unchecked_Conversion (Unsigned_32, U32);
function "not" (Left : Unsigned_32) return Unsigned_32 is
begin
return To_U32 (not From_U32 (Left));
end "not";
function "and" (Left, Right : Unsigned_32) return Unsigned_32 is
begin
return To_U32 (From_U32 (Left) and From_U32 (Right));
end "and";
function "or" (Left, Right : Unsigned_32) return Unsigned_32 is
begin
return To_U32 (From_U32 (Left) or From_U32 (Right));
end "or";
function "xor" (Left, Right : Unsigned_32) return Unsigned_32 is
begin
return To_U32 (From_U32 (Left) xor From_U32 (Right));
end "xor";
-------------------------------------
-- Operations on Unsigned_Quadword --
-------------------------------------
-- It would be nice to replace these with intrinsics, but that does
-- not work yet (the back end would be ok, but GNAT itself objects)
type QWU is mod 2 ** 64; -- 64 = Unsigned_Quadword'Size
-- Unsigned type of same length as Unsigned_Quadword
function To_QW is new Ada.Unchecked_Conversion (QWU, Unsigned_Quadword);
function From_QW is new Ada.Unchecked_Conversion (Unsigned_Quadword, QWU);
function "not" (Left : Unsigned_Quadword) return Unsigned_Quadword is
begin
return To_QW (not From_QW (Left));
end "not";
function "and" (Left, Right : Unsigned_Quadword) return Unsigned_Quadword is
begin
return To_QW (From_QW (Left) and From_QW (Right));
end "and";
function "or" (Left, Right : Unsigned_Quadword) return Unsigned_Quadword is
begin
return To_QW (From_QW (Left) or From_QW (Right));
end "or";
function "xor" (Left, Right : Unsigned_Quadword) return Unsigned_Quadword is
begin
return To_QW (From_QW (Left) xor From_QW (Right));
end "xor";
-----------------------
-- Clear_Interlocked --
-----------------------
procedure Clear_Interlocked
(Bit : in out Boolean;
Old_Value : out Boolean)
is
begin
SSL.Lock_Task.all;
Old_Value := Bit;
Bit := False;
SSL.Unlock_Task.all;
end Clear_Interlocked;
procedure Clear_Interlocked
(Bit : in out Boolean;
Old_Value : out Boolean;
Retry_Count : Natural;
Success_Flag : out Boolean)
is
pragma Warnings (Off, Retry_Count);
begin
SSL.Lock_Task.all;
Old_Value := Bit;
Bit := False;
Success_Flag := True;
SSL.Unlock_Task.all;
end Clear_Interlocked;
---------------------
-- Set_Interlocked --
---------------------
procedure Set_Interlocked
(Bit : in out Boolean;
Old_Value : out Boolean)
is
begin
SSL.Lock_Task.all;
Old_Value := Bit;
Bit := True;
SSL.Unlock_Task.all;
end Set_Interlocked;
procedure Set_Interlocked
(Bit : in out Boolean;
Old_Value : out Boolean;
Retry_Count : Natural;
Success_Flag : out Boolean)
is
pragma Warnings (Off, Retry_Count);
begin
SSL.Lock_Task.all;
Old_Value := Bit;
Bit := True;
Success_Flag := True;
SSL.Unlock_Task.all;
end Set_Interlocked;
---------------------
-- Add_Interlocked --
---------------------
procedure Add_Interlocked
(Addend : Short_Integer;
Augend : in out Aligned_Word;
Sign : out Integer)
is
begin
SSL.Lock_Task.all;
Augend.Value := Augend.Value + Addend;
if Augend.Value < 0 then
Sign := -1;
elsif Augend.Value > 0 then
Sign := +1;
else
Sign := 0;
end if;
SSL.Unlock_Task.all;
end Add_Interlocked;
----------------
-- Add_Atomic --
----------------
procedure Add_Atomic
(To : in out Aligned_Integer;
Amount : Integer)
is
begin
SSL.Lock_Task.all;
To.Value := To.Value + Amount;
SSL.Unlock_Task.all;
end Add_Atomic;
procedure Add_Atomic
(To : in out Aligned_Integer;
Amount : Integer;
Retry_Count : Natural;
Old_Value : out Integer;
Success_Flag : out Boolean)
is
pragma Warnings (Off, Retry_Count);
begin
SSL.Lock_Task.all;
Old_Value := To.Value;
To.Value := To.Value + Amount;
Success_Flag := True;
SSL.Unlock_Task.all;
end Add_Atomic;
procedure Add_Atomic
(To : in out Aligned_Long_Integer;
Amount : Long_Integer)
is
begin
SSL.Lock_Task.all;
To.Value := To.Value + Amount;
SSL.Unlock_Task.all;
end Add_Atomic;
procedure Add_Atomic
(To : in out Aligned_Long_Integer;
Amount : Long_Integer;
Retry_Count : Natural;
Old_Value : out Long_Integer;
Success_Flag : out Boolean)
is
pragma Warnings (Off, Retry_Count);
begin
SSL.Lock_Task.all;
Old_Value := To.Value;
To.Value := To.Value + Amount;
Success_Flag := True;
SSL.Unlock_Task.all;
end Add_Atomic;
----------------
-- And_Atomic --
----------------
type IU is mod 2 ** Integer'Size;
type LU is mod 2 ** Long_Integer'Size;
function To_IU is new Ada.Unchecked_Conversion (Integer, IU);
function From_IU is new Ada.Unchecked_Conversion (IU, Integer);
function To_LU is new Ada.Unchecked_Conversion (Long_Integer, LU);
function From_LU is new Ada.Unchecked_Conversion (LU, Long_Integer);
procedure And_Atomic
(To : in out Aligned_Integer;
From : Integer)
is
begin
SSL.Lock_Task.all;
To.Value := From_IU (To_IU (To.Value) and To_IU (From));
SSL.Unlock_Task.all;
end And_Atomic;
procedure And_Atomic
(To : in out Aligned_Integer;
From : Integer;
Retry_Count : Natural;
Old_Value : out Integer;
Success_Flag : out Boolean)
is
pragma Warnings (Off, Retry_Count);
begin
SSL.Lock_Task.all;
Old_Value := To.Value;
To.Value := From_IU (To_IU (To.Value) and To_IU (From));
Success_Flag := True;
SSL.Unlock_Task.all;
end And_Atomic;
procedure And_Atomic
(To : in out Aligned_Long_Integer;
From : Long_Integer)
is
begin
SSL.Lock_Task.all;
To.Value := From_LU (To_LU (To.Value) and To_LU (From));
SSL.Unlock_Task.all;
end And_Atomic;
procedure And_Atomic
(To : in out Aligned_Long_Integer;
From : Long_Integer;
Retry_Count : Natural;
Old_Value : out Long_Integer;
Success_Flag : out Boolean)
is
pragma Warnings (Off, Retry_Count);
begin
SSL.Lock_Task.all;
Old_Value := To.Value;
To.Value := From_LU (To_LU (To.Value) and To_LU (From));
Success_Flag := True;
SSL.Unlock_Task.all;
end And_Atomic;
---------------
-- Or_Atomic --
---------------
procedure Or_Atomic
(To : in out Aligned_Integer;
From : Integer)
is
begin
SSL.Lock_Task.all;
To.Value := From_IU (To_IU (To.Value) or To_IU (From));
SSL.Unlock_Task.all;
end Or_Atomic;
procedure Or_Atomic
(To : in out Aligned_Integer;
From : Integer;
Retry_Count : Natural;
Old_Value : out Integer;
Success_Flag : out Boolean)
is
pragma Warnings (Off, Retry_Count);
begin
SSL.Lock_Task.all;
Old_Value := To.Value;
To.Value := From_IU (To_IU (To.Value) or To_IU (From));
Success_Flag := True;
SSL.Unlock_Task.all;
end Or_Atomic;
procedure Or_Atomic
(To : in out Aligned_Long_Integer;
From : Long_Integer)
is
begin
SSL.Lock_Task.all;
To.Value := From_LU (To_LU (To.Value) or To_LU (From));
SSL.Unlock_Task.all;
end Or_Atomic;
procedure Or_Atomic
(To : in out Aligned_Long_Integer;
From : Long_Integer;
Retry_Count : Natural;
Old_Value : out Long_Integer;
Success_Flag : out Boolean)
is
pragma Warnings (Off, Retry_Count);
begin
SSL.Lock_Task.all;
Old_Value := To.Value;
To.Value := From_LU (To_LU (To.Value) or To_LU (From));
Success_Flag := True;
SSL.Unlock_Task.all;
end Or_Atomic;
------------------------------------
-- Declarations for Queue Objects --
------------------------------------
type QR;
type QR_Ptr is access QR;
type QR is record
Forward : QR_Ptr;
Backward : QR_Ptr;
end record;
function To_QR_Ptr is new Ada.Unchecked_Conversion (Address, QR_Ptr);
function From_QR_Ptr is new Ada.Unchecked_Conversion (QR_Ptr, Address);
------------
-- Insqhi --
------------
procedure Insqhi
(Item : Address;
Header : Address;
Status : out Insq_Status)
is
Hedr : constant QR_Ptr := To_QR_Ptr (Header);
Next : constant QR_Ptr := Hedr.Forward;
Itm : constant QR_Ptr := To_QR_Ptr (Item);
begin
SSL.Lock_Task.all;
Itm.Forward := Next;
Itm.Backward := Hedr;
Hedr.Forward := Itm;
if Next = null then
Status := OK_First;
else
Next.Backward := Itm;
Status := OK_Not_First;
end if;
SSL.Unlock_Task.all;
end Insqhi;
------------
-- Remqhi --
------------
procedure Remqhi
(Header : Address;
Item : out Address;
Status : out Remq_Status)
is
Hedr : constant QR_Ptr := To_QR_Ptr (Header);
Next : constant QR_Ptr := Hedr.Forward;
begin
SSL.Lock_Task.all;
Item := From_QR_Ptr (Next);
if Next = null then
Status := Fail_Was_Empty;
else
Hedr.Forward := To_QR_Ptr (Item).Forward;
if Hedr.Forward = null then
Status := OK_Empty;
else
Hedr.Forward.Backward := Hedr;
Status := OK_Not_Empty;
end if;
end if;
SSL.Unlock_Task.all;
end Remqhi;
------------
-- Insqti --
------------
procedure Insqti
(Item : Address;
Header : Address;
Status : out Insq_Status)
is
Hedr : constant QR_Ptr := To_QR_Ptr (Header);
Prev : constant QR_Ptr := Hedr.Backward;
Itm : constant QR_Ptr := To_QR_Ptr (Item);
begin
SSL.Lock_Task.all;
Itm.Backward := Prev;
Itm.Forward := Hedr;
Hedr.Backward := Itm;
if Prev = null then
Status := OK_First;
else
Prev.Forward := Itm;
Status := OK_Not_First;
end if;
SSL.Unlock_Task.all;
end Insqti;
------------
-- Remqti --
------------
procedure Remqti
(Header : Address;
Item : out Address;
Status : out Remq_Status)
is
Hedr : constant QR_Ptr := To_QR_Ptr (Header);
Prev : constant QR_Ptr := Hedr.Backward;
begin
SSL.Lock_Task.all;
Item := From_QR_Ptr (Prev);
if Prev = null then
Status := Fail_Was_Empty;
else
Hedr.Backward := To_QR_Ptr (Item).Backward;
if Hedr.Backward = null then
Status := OK_Empty;
else
Hedr.Backward.Forward := Hedr;
Status := OK_Not_Empty;
end if;
end if;
SSL.Unlock_Task.all;
end Remqti;
end System.Aux_DEC;