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------------------------------------------------------------------------------
-- --
-- GNAT COMPILER COMPONENTS --
-- --
-- S E M _ M A P S --
-- --
-- B o d y --
-- --
-- $Revision: 1.2 $ --
-- --
-- Copyright (C) 1996 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 2, 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 COPYING. If not, write --
-- to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, --
-- MA 02111-1307, USA. --
-- --
-- GNAT was originally developed by the GNAT team at New York University. --
-- It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). --
-- --
------------------------------------------------------------------------------
with Atree; use Atree;
with Einfo; use Einfo;
with Namet; use Namet;
with Output; use Output;
with Sinfo; use Sinfo;
with Uintp; use Uintp;
package body Sem_Maps is
-----------------------
-- Local Subprograms --
-----------------------
function Find_Assoc (M : Map; E : Entity_Id) return Assoc_Index;
-- Standard hash table search. M is the map to be searched, E is the
-- entity to be searched for, and Assoc_Index is the resulting
-- association, or is set to No_Assoc if there is no association.
function Find_Header_Size (N : Int) return Header_Index;
-- Find largest power of two smaller than the number of entries in
-- the table. This load factor of 2 may be adjusted later if needed.
procedure Write_Map (E : Entity_Id);
-- For debugging purposes.
---------------------
-- Add_Association --
---------------------
procedure Add_Association
(M : in out Map;
O_Id : Entity_Id;
N_Id : Entity_Id;
Kind : Scope_Kind := S_Local)
is
Info : constant Map_Info := Maps_Table.Table (M);
Offa : constant Assoc_Index := Info.Assoc_Offset;
Offh : constant Header_Index := Info.Header_Offset;
Offs : constant Header_Index := Info.Header_Num;
J : constant Header_Index := Header_Index (O_Id) mod Offs;
K : constant Assoc_Index := Info.Assoc_Next;
begin
Associations_Table.Table (K) := (O_Id, N_Id, Kind, No_Assoc);
Maps_Table.Table (M).Assoc_Next := K + 1;
if Headers_Table.Table (Offh + J) /= No_Assoc then
-- Place new association at head of chain.
Associations_Table.Table (K).Next := Headers_Table.Table (Offh + J);
end if;
Headers_Table.Table (Offh + J) := K;
end Add_Association;
------------------------
-- Build_Instance_Map --
------------------------
function Build_Instance_Map (M : Map) return Map is
Info : constant Map_Info := Maps_Table.Table (M);
Res : constant Map := New_Map (Int (Info.Assoc_Num));
Offh1 : constant Header_Index := Info.Header_Offset;
Offa1 : constant Assoc_Index := Info.Assoc_Offset;
Offh2 : constant Header_Index := Maps_Table.Table (Res).Header_Offset;
Offa2 : constant Assoc_Index := Maps_Table.Table (Res).Assoc_Offset;
A : Assoc;
A_Index : Assoc_Index;
begin
for J in 0 .. Info.Header_Num - 1 loop
A_Index := Headers_Table.Table (Offh1 + J);
if A_Index /= No_Assoc then
Headers_Table.Table (Offh2 + J) := A_Index + (Offa2 - Offa1);
end if;
end loop;
for J in 0 .. Info.Assoc_Num - 1 loop
A := Associations_Table.Table (Offa1 + J);
-- For local entities that come from source, create the
-- corresponding local entities in the instance. Entities that
-- do not come from source are etypes, and new ones will be
-- generated when analyzing the instance.
if No (A.New_Id)
and then A.Kind = S_Local
and then Comes_From_Source (A.Old_Id)
then
A.New_Id := New_Copy (A.Old_Id);
A.New_Id := New_Entity (Nkind (A.Old_Id), Sloc (A.Old_Id));
Set_Chars (A.New_Id, Chars (A.Old_Id));
end if;
if A.Next /= No_Assoc then
A.Next := A.Next + (Offa2 - Offa1);
end if;
Associations_Table.Table (Offa2 + J) := A;
end loop;
Maps_Table.Table (Res).Assoc_Next := Associations_Table.Last;
return Res;
end Build_Instance_Map;
-------------
-- Compose --
-------------
function Compose (Orig_Map : Map; New_Map : Map) return Map is
Res : constant Map := Copy (Orig_Map);
Off : constant Assoc_Index := Maps_Table.Table (Res).Assoc_Offset;
A : Assoc;
K : Assoc_Index;
begin
-- Iterate over the contents of Orig_Map, looking for entities
-- that are further mapped under New_Map.
for J in 0 .. Maps_Table.Table (Res).Assoc_Num - 1 loop
A := Associations_Table.Table (Off + J);
K := Find_Assoc (New_Map, A.New_Id);
if K /= No_Assoc then
Associations_Table.Table (Off + J).New_Id
:= Associations_Table.Table (K).New_Id;
end if;
end loop;
return Res;
end Compose;
----------
-- Copy --
----------
function Copy (M : Map) return Map is
Info : constant Map_Info := Maps_Table.Table (M);
Res : constant Map := New_Map (Int (Info.Assoc_Num));
Offh1 : constant Header_Index := Info.Header_Offset;
Offa1 : constant Assoc_Index := Info.Assoc_Offset;
Offh2 : constant Header_Index := Maps_Table.Table (Res).Header_Offset;
Offa2 : constant Assoc_Index := Maps_Table.Table (Res).Assoc_Offset;
A : Assoc;
A_Index : Assoc_Index;
begin
for J in 0 .. Info.Header_Num - 1 loop
A_Index := Headers_Table.Table (Offh1 + J) + (Offa2 - Offa1);
if A_Index /= No_Assoc then
Headers_Table.Table (Offh2 + J) := A_Index + (Offa2 - Offa1);
end if;
end loop;
for J in 0 .. Info.Assoc_Num - 1 loop
A := Associations_Table.Table (Offa1 + J);
A.Next := A.Next + (Offa2 - Offa1);
Associations_Table.Table (Offa2 + J) := A;
end loop;
Maps_Table.Table (Res).Assoc_Next := Associations_Table.Last;
return Res;
end Copy;
----------------
-- Find_Assoc --
----------------
function Find_Assoc (M : Map; E : Entity_Id) return Assoc_Index is
Offh : constant Header_Index := Maps_Table.Table (M).Header_Offset;
Offs : constant Header_Index := Maps_Table.Table (M).Header_Num;
J : constant Header_Index := Header_Index (E) mod Offs;
A : Assoc;
A_Index : Assoc_Index;
begin
A_Index := Headers_Table.Table (Offh + J);
if A_Index = No_Assoc then
return A_Index;
else
A := Associations_Table.Table (A_Index);
while Present (A.Old_Id) loop
if A.Old_Id = E then
return A_Index;
elsif A.Next = No_Assoc then
return No_Assoc;
else
A_Index := A.Next;
A := Associations_Table.Table (A.Next);
end if;
end loop;
return No_Assoc;
end if;
end Find_Assoc;
----------------------
-- Find_Header_Size --
----------------------
function Find_Header_Size (N : Int) return Header_Index is
Siz : Header_Index;
begin
Siz := 2;
while 2 * Siz < Header_Index (N) loop
Siz := 2 * Siz;
end loop;
return Siz;
end Find_Header_Size;
------------
-- Lookup --
------------
function Lookup (M : Map; E : Entity_Id) return Entity_Id is
Offh : constant Header_Index := Maps_Table.Table (M).Header_Offset;
Offs : constant Header_Index := Maps_Table.Table (M).Header_Num;
J : constant Header_Index := Header_Index (E) mod Offs;
A : Assoc;
begin
if Headers_Table.Table (Offh + J) = No_Assoc then
return Empty;
else
A := Associations_Table.Table (Headers_Table.Table (Offh + J));
while Present (A.Old_Id) loop
if A.Old_Id = E then
return A.New_Id;
elsif A.Next = No_Assoc then
return Empty;
else
A := Associations_Table.Table (A.Next);
end if;
end loop;
return Empty;
end if;
end Lookup;
-------------
-- New_Map --
-------------
function New_Map (Num_Assoc : Int) return Map is
Header_Size : Header_Index := Find_Header_Size (Num_Assoc);
Res : Map_Info;
begin
-- Allocate the tables for the new map at the current end of the
-- global tables.
Associations_Table.Increment_Last;
Headers_Table.Increment_Last;
Maps_Table.Increment_Last;
Res.Header_Offset := Headers_Table.Last;
Res.Header_Num := Header_Size;
Res.Assoc_Offset := Associations_Table.Last;
Res.Assoc_Next := Associations_Table.Last;
Res.Assoc_Num := Assoc_Index (Num_Assoc);
Headers_Table.Set_Last (Headers_Table.Last + Header_Size);
Associations_Table.Set_Last
(Associations_Table.Last + Assoc_Index (Num_Assoc));
Maps_Table.Table (Maps_Table.Last) := Res;
for J in 1 .. Header_Size loop
Headers_Table.Table (Headers_Table.Last - J) := No_Assoc;
end loop;
return Maps_Table.Last;
end New_Map;
------------------------
-- Update_Association --
------------------------
procedure Update_Association
(M : in out Map;
O_Id : Entity_Id;
N_Id : Entity_Id;
Kind : Scope_Kind := S_Local)
is
J : constant Assoc_Index := Find_Assoc (M, O_Id);
begin
Associations_Table.Table (J).New_Id := N_Id;
Associations_Table.Table (J).Kind := Kind;
end Update_Association;
---------------
-- Write_Map --
---------------
procedure Write_Map (E : Entity_Id) is
M : constant Map := Map (UI_To_Int (Renaming_Map (E)));
Info : constant Map_Info := Maps_Table.Table (M);
Offh : constant Header_Index := Info.Header_Offset;
Offa : constant Assoc_Index := Info.Assoc_Offset;
A : Assoc;
begin
Write_Str ("Size : ");
Write_Int (Int (Info.Assoc_Num));
Write_Eol;
Write_Str ("Headers");
Write_Eol;
for J in 0 .. Info.Header_Num - 1 loop
Write_Int (Int (Offh + J));
Write_Str (" : ");
Write_Int (Int (Headers_Table.Table (Offh + J)));
Write_Eol;
end loop;
for J in 0 .. Info.Assoc_Num - 1 loop
A := Associations_Table.Table (Offa + J);
Write_Int (Int (Offa + J));
Write_Str (" : ");
Write_Name (Chars (A.Old_Id));
Write_Str (" ");
Write_Int (Int (A.Old_Id));
Write_Str (" ==> ");
Write_Int (Int (A.New_Id));
Write_Str (" next = ");
Write_Int (Int (A.Next));
Write_Eol;
end loop;
end Write_Map;
end Sem_Maps;
|
