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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- N L I S T S --
-- --
-- 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. See the GNU General Public License --
-- for more details. You should have received a copy of the GNU General --
-- Public License distributed with GNAT; see file COPYING3. If not, go to --
-- http://www.gnu.org/licenses for a complete copy of the license. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc. --
-- --
------------------------------------------------------------------------------
-- WARNING: There is a C version of this package. Any changes to this source
-- file must be properly reflected in the corresponding C header a-nlists.h
with Alloc;
with Atree; use Atree;
with Debug; use Debug;
with Output; use Output;
with Sinfo; use Sinfo;
with Sinfo.Nodes; use Sinfo.Nodes;
with Table;
package body Nlists is
Locked : Boolean := False;
-- Compiling with assertions enabled, list contents modifications are
-- permitted only when this switch is set to False; compiling without
-- assertions this lock has no effect.
----------------------------------
-- Implementation of Node Lists --
----------------------------------
-- A node list is represented by a list header which contains
-- three fields:
type List_Header is record
First : Node_Or_Entity_Id;
-- Pointer to first node in list. Empty if list is empty
Last : Node_Or_Entity_Id;
-- Pointer to last node in list. Empty if list is empty
Parent : Node_Id;
-- Pointer to parent of list. Empty if list has no parent
end record;
-- The node lists are stored in a table indexed by List_Id values
package Lists is new Table.Table (
Table_Component_Type => List_Header,
Table_Index_Type => List_Id'Base,
Table_Low_Bound => First_List_Id,
Table_Initial => Alloc.Lists_Initial,
Table_Increment => Alloc.Lists_Increment,
Table_Name => "Lists");
-- The nodes in the list all have the In_List flag set, and their Link
-- fields (which otherwise point to the parent) contain the List_Id of
-- the list header giving immediate access to the list containing the
-- node, and its parent and first and last elements.
-- Two auxiliary tables, indexed by Node_Id values and built in parallel
-- with the main nodes table and always having the same size contain the
-- list link values that allow locating the previous and next node in a
-- list. The entries in these tables are valid only if the In_List flag
-- is set in the corresponding node. Next_Node is Empty at the end of a
-- list and Prev_Node is Empty at the start of a list.
package Next_Node is new Table.Table (
Table_Component_Type => Node_Or_Entity_Id,
Table_Index_Type => Node_Or_Entity_Id'Base,
Table_Low_Bound => First_Node_Id,
Table_Initial => Alloc.Node_Offsets_Initial,
Table_Increment => Alloc.Node_Offsets_Increment,
Table_Name => "Next_Node");
package Prev_Node is new Table.Table (
Table_Component_Type => Node_Or_Entity_Id,
Table_Index_Type => Node_Or_Entity_Id'Base,
Table_Low_Bound => First_Node_Id,
Table_Initial => Alloc.Node_Offsets_Initial,
Table_Increment => Alloc.Node_Offsets_Increment,
Table_Name => "Prev_Node");
-----------------------
-- Local Subprograms --
-----------------------
procedure Set_First (List : List_Id; To : Node_Or_Entity_Id);
pragma Inline (Set_First);
-- Sets First field of list header List to reference To
procedure Set_Last (List : List_Id; To : Node_Or_Entity_Id);
pragma Inline (Set_Last);
-- Sets Last field of list header List to reference To
procedure Set_List_Link (Node : Node_Or_Entity_Id; To : List_Id);
pragma Inline (Set_List_Link);
-- Sets list link of Node to list header To
procedure Set_Next (Node : Node_Or_Entity_Id; To : Node_Or_Entity_Id);
pragma Inline (Set_Next);
-- Sets the Next_Node pointer for Node to reference To
procedure Set_Prev (Node : Node_Or_Entity_Id; To : Node_Or_Entity_Id);
pragma Inline (Set_Prev);
-- Sets the Prev_Node pointer for Node to reference To
--------------------------
-- Allocate_List_Tables --
--------------------------
procedure Allocate_List_Tables (N : Node_Or_Entity_Id) is
Old_Last : constant Node_Or_Entity_Id'Base := Next_Node.Last;
begin
pragma Assert (N >= Old_Last);
Next_Node.Set_Last (N);
Prev_Node.Set_Last (N);
-- Make sure we have no uninitialized junk in any new entries added.
for J in Old_Last + 1 .. N loop
Next_Node.Table (J) := Empty;
Prev_Node.Table (J) := Empty;
end loop;
end Allocate_List_Tables;
------------
-- Append --
------------
procedure Append (Node : Node_Or_Entity_Id; To : List_Id) is
L : constant Node_Or_Entity_Id := Last (To);
procedure Append_Debug;
pragma Inline (Append_Debug);
-- Output debug information if Debug_Flag_N set
------------------
-- Append_Debug --
------------------
procedure Append_Debug is
begin
if Debug_Flag_N then
Write_Str ("Append node ");
Write_Int (Int (Node));
Write_Str (" to list ");
Write_Int (Int (To));
Write_Eol;
end if;
end Append_Debug;
-- Start of processing for Append
begin
pragma Assert (not Is_List_Member (Node));
if Node = Error then
return;
end if;
pragma Debug (Append_Debug);
if No (L) then
Set_First (To, Node);
else
Set_Next (L, Node);
end if;
Set_Last (To, Node);
Set_In_List (Node, True);
Set_Next (Node, Empty);
Set_Prev (Node, L);
Set_List_Link (Node, To);
end Append;
-----------------
-- Append_List --
-----------------
procedure Append_List (List : List_Id; To : List_Id) is
procedure Append_List_Debug;
pragma Inline (Append_List_Debug);
-- Output debug information if Debug_Flag_N set
-----------------------
-- Append_List_Debug --
-----------------------
procedure Append_List_Debug is
begin
if Debug_Flag_N then
Write_Str ("Append list ");
Write_Int (Int (List));
Write_Str (" to list ");
Write_Int (Int (To));
Write_Eol;
end if;
end Append_List_Debug;
-- Start of processing for Append_List
begin
if Is_Empty_List (List) then
return;
else
declare
L : constant Node_Or_Entity_Id := Last (To);
F : constant Node_Or_Entity_Id := First (List);
N : Node_Or_Entity_Id;
begin
pragma Debug (Append_List_Debug);
N := F;
loop
Set_List_Link (N, To);
Next (N);
exit when No (N);
end loop;
if No (L) then
Set_First (To, F);
else
Set_Next (L, F);
end if;
Set_Prev (F, L);
Set_Last (To, Last (List));
Set_First (List, Empty);
Set_Last (List, Empty);
end;
end if;
end Append_List;
--------------------
-- Append_List_To --
--------------------
procedure Append_List_To (To : List_Id; List : List_Id) is
begin
Append_List (List, To);
end Append_List_To;
----------------
-- Append_New --
----------------
procedure Append_New (Node : Node_Or_Entity_Id; To : in out List_Id) is
begin
if No (To) then
To := New_List;
end if;
Append (Node, To);
end Append_New;
-------------------
-- Append_New_To --
-------------------
procedure Append_New_To (To : in out List_Id; Node : Node_Or_Entity_Id) is
begin
Append_New (Node, To);
end Append_New_To;
---------------
-- Append_To --
---------------
procedure Append_To (To : List_Id; Node : Node_Or_Entity_Id) is
begin
Append (Node, To);
end Append_To;
-----------
-- First --
-----------
function First (List : List_Id) return Node_Or_Entity_Id is
begin
if List = No_List then
return Empty;
else
pragma Assert (List <= Lists.Last);
return Lists.Table (List).First;
end if;
end First;
----------------------
-- First_Non_Pragma --
----------------------
function First_Non_Pragma (List : List_Id) return Node_Or_Entity_Id is
N : constant Node_Or_Entity_Id := First (List);
begin
if Nkind (N) /= N_Pragma
and then
Nkind (N) /= N_Null_Statement
then
return N;
else
return Next_Non_Pragma (N);
end if;
end First_Non_Pragma;
----------------
-- Initialize --
----------------
procedure Initialize is
begin
Lists.Init;
Next_Node.Init;
Prev_Node.Init;
-- Allocate Error_List list header
Lists.Increment_Last;
Set_Parent (Error_List, Empty);
Set_First (Error_List, Empty);
Set_Last (Error_List, Empty);
end Initialize;
------------------
-- In_Same_List --
------------------
function In_Same_List (N1, N2 : Node_Or_Entity_Id) return Boolean is
begin
return List_Containing (N1) = List_Containing (N2);
end In_Same_List;
------------------
-- Insert_After --
------------------
procedure Insert_After
(After : Node_Or_Entity_Id;
Node : Node_Or_Entity_Id)
is
procedure Insert_After_Debug;
pragma Inline (Insert_After_Debug);
-- Output debug information if Debug_Flag_N set
------------------------
-- Insert_After_Debug --
------------------------
procedure Insert_After_Debug is
begin
if Debug_Flag_N then
Write_Str ("Insert node");
Write_Int (Int (Node));
Write_Str (" after node ");
Write_Int (Int (After));
Write_Eol;
end if;
end Insert_After_Debug;
-- Start of processing for Insert_After
begin
pragma Assert
(Is_List_Member (After) and then not Is_List_Member (Node));
if Node = Error then
return;
end if;
pragma Debug (Insert_After_Debug);
declare
Before : constant Node_Or_Entity_Id := Next (After);
LC : constant List_Id := List_Containing (After);
begin
if Present (Before) then
Set_Prev (Before, Node);
else
Set_Last (LC, Node);
end if;
Set_Next (After, Node);
Set_In_List (Node, True);
Set_Prev (Node, After);
Set_Next (Node, Before);
Set_List_Link (Node, LC);
end;
end Insert_After;
-------------------
-- Insert_Before --
-------------------
procedure Insert_Before
(Before : Node_Or_Entity_Id;
Node : Node_Or_Entity_Id)
is
procedure Insert_Before_Debug;
pragma Inline (Insert_Before_Debug);
-- Output debug information if Debug_Flag_N set
-------------------------
-- Insert_Before_Debug --
-------------------------
procedure Insert_Before_Debug is
begin
if Debug_Flag_N then
Write_Str ("Insert node");
Write_Int (Int (Node));
Write_Str (" before node ");
Write_Int (Int (Before));
Write_Eol;
end if;
end Insert_Before_Debug;
-- Start of processing for Insert_Before
begin
pragma Assert
(Is_List_Member (Before) and then not Is_List_Member (Node));
if Node = Error then
return;
end if;
pragma Debug (Insert_Before_Debug);
declare
After : constant Node_Or_Entity_Id := Prev (Before);
LC : constant List_Id := List_Containing (Before);
begin
if Present (After) then
Set_Next (After, Node);
else
Set_First (LC, Node);
end if;
Set_Prev (Before, Node);
Set_In_List (Node, True);
Set_Prev (Node, After);
Set_Next (Node, Before);
Set_List_Link (Node, LC);
end;
end Insert_Before;
-----------------------
-- Insert_List_After --
-----------------------
procedure Insert_List_After (After : Node_Or_Entity_Id; List : List_Id) is
procedure Insert_List_After_Debug;
pragma Inline (Insert_List_After_Debug);
-- Output debug information if Debug_Flag_N set
-----------------------------
-- Insert_List_After_Debug --
-----------------------------
procedure Insert_List_After_Debug is
begin
if Debug_Flag_N then
Write_Str ("Insert list ");
Write_Int (Int (List));
Write_Str (" after node ");
Write_Int (Int (After));
Write_Eol;
end if;
end Insert_List_After_Debug;
-- Start of processing for Insert_List_After
begin
pragma Assert (Is_List_Member (After));
if Is_Empty_List (List) then
return;
else
declare
Before : constant Node_Or_Entity_Id := Next (After);
LC : constant List_Id := List_Containing (After);
F : constant Node_Or_Entity_Id := First (List);
L : constant Node_Or_Entity_Id := Last (List);
N : Node_Or_Entity_Id;
begin
pragma Debug (Insert_List_After_Debug);
N := F;
loop
Set_List_Link (N, LC);
exit when N = L;
Next (N);
end loop;
if Present (Before) then
Set_Prev (Before, L);
else
Set_Last (LC, L);
end if;
Set_Next (After, F);
Set_Prev (F, After);
Set_Next (L, Before);
Set_First (List, Empty);
Set_Last (List, Empty);
end;
end if;
end Insert_List_After;
------------------------
-- Insert_List_Before --
------------------------
procedure Insert_List_Before (Before : Node_Or_Entity_Id; List : List_Id) is
procedure Insert_List_Before_Debug;
pragma Inline (Insert_List_Before_Debug);
-- Output debug information if Debug_Flag_N set
------------------------------
-- Insert_List_Before_Debug --
------------------------------
procedure Insert_List_Before_Debug is
begin
if Debug_Flag_N then
Write_Str ("Insert list ");
Write_Int (Int (List));
Write_Str (" before node ");
Write_Int (Int (Before));
Write_Eol;
end if;
end Insert_List_Before_Debug;
-- Start of processing for Insert_List_Before
begin
pragma Assert (Is_List_Member (Before));
if Is_Empty_List (List) then
return;
else
declare
After : constant Node_Or_Entity_Id := Prev (Before);
LC : constant List_Id := List_Containing (Before);
F : constant Node_Or_Entity_Id := First (List);
L : constant Node_Or_Entity_Id := Last (List);
N : Node_Or_Entity_Id;
begin
pragma Debug (Insert_List_Before_Debug);
N := F;
loop
Set_List_Link (N, LC);
exit when N = L;
Next (N);
end loop;
if Present (After) then
Set_Next (After, F);
else
Set_First (LC, F);
end if;
Set_Prev (Before, L);
Set_Prev (F, After);
Set_Next (L, Before);
Set_First (List, Empty);
Set_Last (List, Empty);
end;
end if;
end Insert_List_Before;
-------------------
-- Is_Empty_List --
-------------------
function Is_Empty_List (List : List_Id) return Boolean is
begin
return First (List) = Empty;
end Is_Empty_List;
--------------------
-- Is_List_Member --
--------------------
function Is_List_Member (Node : Node_Or_Entity_Id) return Boolean is
begin
return In_List (Node);
end Is_List_Member;
-----------------------
-- Is_Non_Empty_List --
-----------------------
function Is_Non_Empty_List (List : List_Id) return Boolean is
begin
return First (List) /= Empty;
end Is_Non_Empty_List;
----------
-- Last --
----------
function Last (List : List_Id) return Node_Or_Entity_Id is
begin
pragma Assert (List <= Lists.Last);
return Lists.Table (List).Last;
end Last;
------------------
-- Last_List_Id --
------------------
function Last_List_Id return List_Id is
begin
return Lists.Last;
end Last_List_Id;
---------------------
-- Last_Non_Pragma --
---------------------
function Last_Non_Pragma (List : List_Id) return Node_Or_Entity_Id is
N : constant Node_Or_Entity_Id := Last (List);
begin
if Nkind (N) /= N_Pragma then
return N;
else
return Prev_Non_Pragma (N);
end if;
end Last_Non_Pragma;
---------------------
-- List_Containing --
---------------------
function List_Containing (Node : Node_Or_Entity_Id) return List_Id is
begin
pragma Assert (Is_List_Member (Node));
return List_Id (Link (Node));
end List_Containing;
-----------------
-- List_Length --
-----------------
function List_Length (List : List_Id) return Nat is
Result : Nat;
Node : Node_Or_Entity_Id;
begin
Result := 0;
Node := First (List);
while Present (Node) loop
Result := Result + 1;
Next (Node);
end loop;
return Result;
end List_Length;
-------------------
-- Lists_Address --
-------------------
function Lists_Address return System.Address is
begin
return Lists.Table (First_List_Id)'Address;
end Lists_Address;
----------
-- Lock --
----------
procedure Lock is
begin
Lists.Release;
Lists.Locked := True;
Prev_Node.Release;
Prev_Node.Locked := True;
Next_Node.Release;
Next_Node.Locked := True;
end Lock;
----------------
-- Lock_Lists --
----------------
procedure Lock_Lists is
begin
pragma Assert (not Locked);
Locked := True;
end Lock_Lists;
-------------------
-- New_Copy_List --
-------------------
function New_Copy_List (List : List_Id) return List_Id is
NL : List_Id;
E : Node_Or_Entity_Id;
begin
if List = No_List then
return No_List;
else
NL := New_List;
E := First (List);
while Present (E) loop
Append (New_Copy (E), NL);
Next (E);
end loop;
return NL;
end if;
end New_Copy_List;
----------------------------
-- New_Copy_List_Original --
----------------------------
function New_Copy_List_Original (List : List_Id) return List_Id is
NL : List_Id;
E : Node_Or_Entity_Id;
begin
if List = No_List then
return No_List;
else
NL := New_List;
E := First (List);
while Present (E) loop
if Comes_From_Source (E) then
Append (New_Copy (E), NL);
end if;
Next (E);
end loop;
return NL;
end if;
end New_Copy_List_Original;
--------------
-- New_List --
--------------
function New_List return List_Id is
procedure New_List_Debug;
pragma Inline (New_List_Debug);
-- Output debugging information if Debug_Flag_N is set
--------------------
-- New_List_Debug --
--------------------
procedure New_List_Debug is
begin
if Debug_Flag_N then
Write_Str ("Allocate new list, returned ID = ");
Write_Int (Int (Lists.Last));
Write_Eol;
end if;
end New_List_Debug;
-- Start of processing for New_List
begin
Lists.Increment_Last;
declare
List : constant List_Id := Lists.Last;
begin
Set_Parent (List, Empty);
Set_First (List, Empty);
Set_Last (List, Empty);
pragma Debug (New_List_Debug);
return (List);
end;
end New_List;
-- Since the one argument case is common, we optimize to build the right
-- list directly, rather than first building an empty list and then doing
-- the insertion, which results in some unnecessary work.
function New_List (Node : Node_Or_Entity_Id) return List_Id is
procedure New_List_Debug;
pragma Inline (New_List_Debug);
-- Output debugging information if Debug_Flag_N is set
--------------------
-- New_List_Debug --
--------------------
procedure New_List_Debug is
begin
if Debug_Flag_N then
Write_Str ("Allocate new list, returned ID = ");
Write_Int (Int (Lists.Last));
Write_Eol;
end if;
end New_List_Debug;
-- Start of processing for New_List
begin
if Node = Error then
return New_List;
else
pragma Assert (not Is_List_Member (Node));
Lists.Increment_Last;
declare
List : constant List_Id := Lists.Last;
begin
Set_Parent (List, Empty);
Set_First (List, Node);
Set_Last (List, Node);
Set_In_List (Node, True);
Set_List_Link (Node, List);
Set_Prev (Node, Empty);
Set_Next (Node, Empty);
pragma Debug (New_List_Debug);
return List;
end;
end if;
end New_List;
function New_List
(Node1 : Node_Or_Entity_Id;
Node2 : Node_Or_Entity_Id) return List_Id
is
L : constant List_Id := New_List (Node1);
begin
Append (Node2, L);
return L;
end New_List;
function New_List
(Node1 : Node_Or_Entity_Id;
Node2 : Node_Or_Entity_Id;
Node3 : Node_Or_Entity_Id) return List_Id
is
L : constant List_Id := New_List (Node1);
begin
Append (Node2, L);
Append (Node3, L);
return L;
end New_List;
function New_List
(Node1 : Node_Or_Entity_Id;
Node2 : Node_Or_Entity_Id;
Node3 : Node_Or_Entity_Id;
Node4 : Node_Or_Entity_Id) return List_Id
is
L : constant List_Id := New_List (Node1);
begin
Append (Node2, L);
Append (Node3, L);
Append (Node4, L);
return L;
end New_List;
function New_List
(Node1 : Node_Or_Entity_Id;
Node2 : Node_Or_Entity_Id;
Node3 : Node_Or_Entity_Id;
Node4 : Node_Or_Entity_Id;
Node5 : Node_Or_Entity_Id) return List_Id
is
L : constant List_Id := New_List (Node1);
begin
Append (Node2, L);
Append (Node3, L);
Append (Node4, L);
Append (Node5, L);
return L;
end New_List;
function New_List
(Node1 : Node_Or_Entity_Id;
Node2 : Node_Or_Entity_Id;
Node3 : Node_Or_Entity_Id;
Node4 : Node_Or_Entity_Id;
Node5 : Node_Or_Entity_Id;
Node6 : Node_Or_Entity_Id) return List_Id
is
L : constant List_Id := New_List (Node1);
begin
Append (Node2, L);
Append (Node3, L);
Append (Node4, L);
Append (Node5, L);
Append (Node6, L);
return L;
end New_List;
----------
-- Next --
----------
function Next (Node : Node_Or_Entity_Id) return Node_Or_Entity_Id is
begin
pragma Assert (Is_List_Member (Node));
return Next_Node.Table (Node);
end Next;
procedure Next (Node : in out Node_Or_Entity_Id) is
begin
Node := Next (Node);
end Next;
-----------------------
-- Next_Node_Address --
-----------------------
function Next_Node_Address return System.Address is
begin
return Next_Node.Table (First_Node_Id)'Address;
end Next_Node_Address;
---------------------
-- Next_Non_Pragma --
---------------------
function Next_Non_Pragma
(Node : Node_Or_Entity_Id) return Node_Or_Entity_Id
is
N : Node_Or_Entity_Id;
begin
N := Node;
loop
Next (N);
exit when Nkind (N) not in N_Pragma | N_Null_Statement;
end loop;
return N;
end Next_Non_Pragma;
procedure Next_Non_Pragma (Node : in out Node_Or_Entity_Id) is
begin
Node := Next_Non_Pragma (Node);
end Next_Non_Pragma;
--------
-- No --
--------
function No (List : List_Id) return Boolean is
begin
return List = No_List;
end No;
---------------
-- Num_Lists --
---------------
function Num_Lists return Nat is
begin
return Int (Lists.Last) - Int (Lists.First) + 1;
end Num_Lists;
------------
-- Parent --
------------
function Parent (List : List_Id) return Node_Or_Entity_Id is
begin
pragma Assert (Present (List));
pragma Assert (List <= Lists.Last);
return Lists.Table (List).Parent;
end Parent;
----------
-- Pick --
----------
function Pick (List : List_Id; Index : Pos) return Node_Or_Entity_Id is
Elmt : Node_Or_Entity_Id;
begin
Elmt := First (List);
for J in 1 .. Index - 1 loop
Next (Elmt);
end loop;
return Elmt;
end Pick;
-------------
-- Prepend --
-------------
procedure Prepend (Node : Node_Or_Entity_Id; To : List_Id) is
F : constant Node_Or_Entity_Id := First (To);
procedure Prepend_Debug;
pragma Inline (Prepend_Debug);
-- Output debug information if Debug_Flag_N set
-------------------
-- Prepend_Debug --
-------------------
procedure Prepend_Debug is
begin
if Debug_Flag_N then
Write_Str ("Prepend node ");
Write_Int (Int (Node));
Write_Str (" to list ");
Write_Int (Int (To));
Write_Eol;
end if;
end Prepend_Debug;
-- Start of processing for Prepend_Debug
begin
pragma Assert (not Is_List_Member (Node));
if Node = Error then
return;
end if;
pragma Debug (Prepend_Debug);
if No (F) then
Set_Last (To, Node);
else
Set_Prev (F, Node);
end if;
Set_First (To, Node);
Set_In_List (Node, True);
Set_Next (Node, F);
Set_Prev (Node, Empty);
Set_List_Link (Node, To);
end Prepend;
------------------
-- Prepend_List --
------------------
procedure Prepend_List (List : List_Id; To : List_Id) is
procedure Prepend_List_Debug;
pragma Inline (Prepend_List_Debug);
-- Output debug information if Debug_Flag_N set
------------------------
-- Prepend_List_Debug --
------------------------
procedure Prepend_List_Debug is
begin
if Debug_Flag_N then
Write_Str ("Prepend list ");
Write_Int (Int (List));
Write_Str (" to list ");
Write_Int (Int (To));
Write_Eol;
end if;
end Prepend_List_Debug;
-- Start of processing for Prepend_List
begin
if Is_Empty_List (List) then
return;
else
declare
F : constant Node_Or_Entity_Id := First (To);
L : constant Node_Or_Entity_Id := Last (List);
N : Node_Or_Entity_Id;
begin
pragma Debug (Prepend_List_Debug);
N := L;
loop
Set_List_Link (N, To);
N := Prev (N);
exit when No (N);
end loop;
if No (F) then
Set_Last (To, L);
else
Set_Next (L, F);
end if;
Set_Prev (F, L);
Set_First (To, First (List));
Set_First (List, Empty);
Set_Last (List, Empty);
end;
end if;
end Prepend_List;
---------------------
-- Prepend_List_To --
---------------------
procedure Prepend_List_To (To : List_Id; List : List_Id) is
begin
Prepend_List (List, To);
end Prepend_List_To;
-----------------
-- Prepend_New --
-----------------
procedure Prepend_New (Node : Node_Or_Entity_Id; To : in out List_Id) is
begin
if No (To) then
To := New_List;
end if;
Prepend (Node, To);
end Prepend_New;
--------------------
-- Prepend_New_To --
--------------------
procedure Prepend_New_To (To : in out List_Id; Node : Node_Or_Entity_Id) is
begin
Prepend_New (Node, To);
end Prepend_New_To;
----------------
-- Prepend_To --
----------------
procedure Prepend_To (To : List_Id; Node : Node_Or_Entity_Id) is
begin
Prepend (Node, To);
end Prepend_To;
-------------
-- Present --
-------------
function Present (List : List_Id) return Boolean is
begin
return List /= No_List;
end Present;
----------
-- Prev --
----------
function Prev (Node : Node_Or_Entity_Id) return Node_Or_Entity_Id is
begin
pragma Assert (Is_List_Member (Node));
return Prev_Node.Table (Node);
end Prev;
procedure Prev (Node : in out Node_Or_Entity_Id) is
begin
Node := Prev (Node);
end Prev;
-----------------------
-- Prev_Node_Address --
-----------------------
function Prev_Node_Address return System.Address is
begin
return Prev_Node.Table (First_Node_Id)'Address;
end Prev_Node_Address;
---------------------
-- Prev_Non_Pragma --
---------------------
function Prev_Non_Pragma
(Node : Node_Or_Entity_Id) return Node_Or_Entity_Id
is
N : Node_Or_Entity_Id;
begin
N := Node;
loop
N := Prev (N);
exit when Nkind (N) /= N_Pragma;
end loop;
return N;
end Prev_Non_Pragma;
procedure Prev_Non_Pragma (Node : in out Node_Or_Entity_Id) is
begin
Node := Prev_Non_Pragma (Node);
end Prev_Non_Pragma;
------------
-- Remove --
------------
procedure Remove (Node : Node_Or_Entity_Id) is
Lst : constant List_Id := List_Containing (Node);
Prv : constant Node_Or_Entity_Id := Prev (Node);
Nxt : constant Node_Or_Entity_Id := Next (Node);
procedure Remove_Debug;
pragma Inline (Remove_Debug);
-- Output debug information if Debug_Flag_N set
------------------
-- Remove_Debug --
------------------
procedure Remove_Debug is
begin
if Debug_Flag_N then
Write_Str ("Remove node ");
Write_Int (Int (Node));
Write_Eol;
end if;
end Remove_Debug;
-- Start of processing for Remove
begin
pragma Debug (Remove_Debug);
if No (Prv) then
Set_First (Lst, Nxt);
else
Set_Next (Prv, Nxt);
end if;
if No (Nxt) then
Set_Last (Lst, Prv);
else
Set_Prev (Nxt, Prv);
end if;
Set_In_List (Node, False);
Set_Parent (Node, Empty);
end Remove;
-----------------
-- Remove_Head --
-----------------
function Remove_Head (List : List_Id) return Node_Or_Entity_Id is
Frst : constant Node_Or_Entity_Id := First (List);
procedure Remove_Head_Debug;
pragma Inline (Remove_Head_Debug);
-- Output debug information if Debug_Flag_N set
-----------------------
-- Remove_Head_Debug --
-----------------------
procedure Remove_Head_Debug is
begin
if Debug_Flag_N then
Write_Str ("Remove head of list ");
Write_Int (Int (List));
Write_Eol;
end if;
end Remove_Head_Debug;
-- Start of processing for Remove_Head
begin
pragma Debug (Remove_Head_Debug);
if Frst = Empty then
return Empty;
else
declare
Nxt : constant Node_Or_Entity_Id := Next (Frst);
begin
Set_First (List, Nxt);
if No (Nxt) then
Set_Last (List, Empty);
else
Set_Prev (Nxt, Empty);
end if;
Set_In_List (Frst, False);
Set_Parent (Frst, Empty);
return Frst;
end;
end if;
end Remove_Head;
-----------------
-- Remove_Next --
-----------------
function Remove_Next
(Node : Node_Or_Entity_Id) return Node_Or_Entity_Id
is
Nxt : constant Node_Or_Entity_Id := Next (Node);
procedure Remove_Next_Debug;
pragma Inline (Remove_Next_Debug);
-- Output debug information if Debug_Flag_N set
-----------------------
-- Remove_Next_Debug --
-----------------------
procedure Remove_Next_Debug is
begin
if Debug_Flag_N then
Write_Str ("Remove next node after ");
Write_Int (Int (Node));
Write_Eol;
end if;
end Remove_Next_Debug;
-- Start of processing for Remove_Next
begin
if Present (Nxt) then
declare
Nxt2 : constant Node_Or_Entity_Id := Next (Nxt);
LC : constant List_Id := List_Containing (Node);
begin
pragma Debug (Remove_Next_Debug);
Set_Next (Node, Nxt2);
if No (Nxt2) then
Set_Last (LC, Node);
else
Set_Prev (Nxt2, Node);
end if;
Set_In_List (Nxt, False);
Set_Parent (Nxt, Empty);
end;
end if;
return Nxt;
end Remove_Next;
---------------
-- Set_First --
---------------
procedure Set_First (List : List_Id; To : Node_Or_Entity_Id) is
begin
pragma Assert (not Locked);
Lists.Table (List).First := To;
end Set_First;
--------------
-- Set_Last --
--------------
procedure Set_Last (List : List_Id; To : Node_Or_Entity_Id) is
begin
pragma Assert (not Locked);
Lists.Table (List).Last := To;
end Set_Last;
-------------------
-- Set_List_Link --
-------------------
procedure Set_List_Link (Node : Node_Or_Entity_Id; To : List_Id) is
begin
pragma Assert (not Locked);
Set_Link (Node, Union_Id (To));
end Set_List_Link;
--------------
-- Set_Next --
--------------
procedure Set_Next (Node : Node_Or_Entity_Id; To : Node_Or_Entity_Id) is
begin
pragma Assert (not Locked);
Next_Node.Table (Node) := To;
end Set_Next;
----------------
-- Set_Parent --
----------------
procedure Set_Parent (List : List_Id; Node : Node_Or_Entity_Id) is
begin
pragma Assert (not Locked);
pragma Assert (List <= Lists.Last);
Lists.Table (List).Parent := Node;
end Set_Parent;
--------------
-- Set_Prev --
--------------
procedure Set_Prev (Node : Node_Or_Entity_Id; To : Node_Or_Entity_Id) is
begin
pragma Assert (not Locked);
Prev_Node.Table (Node) := To;
end Set_Prev;
------------
-- Unlock --
------------
procedure Unlock is
begin
Lists.Locked := False;
Prev_Node.Locked := False;
Next_Node.Locked := False;
end Unlock;
------------------
-- Unlock_Lists --
------------------
procedure Unlock_Lists is
begin
pragma Assert (Locked);
Locked := False;
end Unlock_Lists;
end Nlists;