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-- Cross references.
-- Copyright (C) 2002, 2003, 2004, 2005 Tristan Gingold
--
-- GHDL is free software; you can redistribute it and/or modify it under
-- the terms of the GNU General Public License as published by the Free
-- Software Foundation; either version 2, or (at your option) any later
-- version.
--
-- GHDL is distributed in the hope that it will be useful, but WITHOUT 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
-- along with GHDL; see the file COPYING. If not, write to the Free
-- Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-- 02111-1307, USA.
with Tables;
with GNAT.Heap_Sort_A;
with Flags;
with Vhdl.Std_Package;
with Errorout; use Errorout;
with Vhdl.Nodes_Priv;
package body Vhdl.Xrefs is
type Xref_Type is record
-- Where the cross-reference (or the name) appears.
Loc : Location_Type;
-- What the name refer to.
Ref : Iir;
-- Kind of reference (See package specification).
Kind : Xref_Kind;
end record;
package Xref_Table is new Tables
(Table_Index_Type => Natural,
Table_Component_Type => Xref_Type,
Table_Low_Bound => 0,
Table_Initial => 128);
function Get_Xref_Location (N : Xref) return Location_Type is
begin
return Xref_Table.Table (N).Loc;
end Get_Xref_Location;
function Get_Xref_Kind (N : Xref) return Xref_Kind is
begin
return Xref_Table.Table (N).Kind;
end Get_Xref_Kind;
function Get_Xref_Node (N : Xref) return Iir is
begin
return Xref_Table.Table (N).Ref;
end Get_Xref_Node;
function Get_Last_Xref return Xref is
begin
return Xref_Table.Last;
end Get_Last_Xref;
procedure Init is
begin
Xref_Table.Set_Last (Bad_Xref);
end Init;
procedure Add_Xref (Loc : Location_Type; Ref : Iir; Kind : Xref_Kind) is
begin
-- Check there is no xref for the same location to the same reference.
-- (Note that a designatore may reference several declarations, this
-- is possible in attribute specification for an overloadable name).
-- This is a simple heuristic as this catch only two referenced in the
-- row but efficient and should be enough to catch errors.
pragma Assert
(Xref_Table.Last < Xref_Table.First
or else Xref_Table.Table (Xref_Table.Last).Loc /= Loc
or else Xref_Table.Table (Xref_Table.Last).Ref /= Ref);
Xref_Table.Append (Xref_Type'(Loc => Loc,
Ref => Ref,
Kind => Kind));
end Add_Xref;
procedure Xref_Decl (Decl : Iir) is
begin
if Flags.Flag_Xref then
Add_Xref (Get_Location (Decl), Decl, Xref_Decl);
end if;
end Xref_Decl;
procedure Xref_Ref (Name : Iir; Decl : Iir) is
begin
if Flags.Flag_Xref then
Add_Xref (Get_Location (Name), Decl, Xref_Ref);
end if;
end Xref_Ref;
procedure Xref_Body (Bod : Iir; Spec : Iir) is
begin
if Flags.Flag_Xref then
Add_Xref (Get_Location (Bod), Spec, Xref_Body);
end if;
end Xref_Body;
procedure Xref_End (Loc : Location_Type; Decl : Iir) is
begin
if Flags.Flag_Xref then
Add_Xref (Loc, Decl, Xref_End);
end if;
end Xref_End;
procedure Xref_Keyword (Loc : Location_Type) is
begin
if Flags.Flag_Xref then
Add_Xref (Loc, Null_Iir, Xref_Keyword);
end if;
end Xref_Keyword;
procedure Xref_Name_1 (Name : Iir) is
begin
case Get_Kind (Name) is
when Iir_Kind_Simple_Name
| Iir_Kind_Selected_Name
| Iir_Kind_Operator_Symbol
| Iir_Kind_Character_Literal =>
declare
Res : constant Iir := Get_Named_Entity (Name);
begin
if Res = Vhdl.Std_Package.Error_Mark then
return;
end if;
Add_Xref (Get_Location (Name), Res, Xref_Ref);
end;
when Iir_Kind_Selected_Element =>
Add_Xref (Get_Location (Name),
Get_Named_Entity (Name), Xref_Ref);
when Iir_Kind_Dereference
| Iir_Kind_Implicit_Dereference
| Iir_Kind_Slice_Name
| Iir_Kind_Indexed_Name
| Iir_Kind_Function_Call =>
null;
when Iir_Kinds_Attribute =>
null;
when Iir_Kind_Attribute_Name =>
-- FIXME: user defined attributes.
null;
when Iir_Kind_Type_Conversion =>
return;
when others =>
Error_Kind ("xref_name_1", Name);
end case;
case Get_Kind (Name) is
when Iir_Kind_Simple_Name
| Iir_Kind_Operator_Symbol
| Iir_Kind_Character_Literal =>
null;
when Iir_Kind_Selected_Name
| Iir_Kind_Selected_Element
| Iir_Kind_Attribute_Name
| Iir_Kind_Slice_Name
| Iir_Kind_Indexed_Name
| Iir_Kind_Dereference
| Iir_Kind_Implicit_Dereference
| Iir_Kinds_Attribute
| Iir_Kind_Function_Call =>
Xref_Name_1 (Get_Prefix (Name));
when others =>
Error_Kind ("xref_name_1", Name);
end case;
end Xref_Name_1;
procedure Xref_Name (Name : Iir) is
begin
if Flags.Flag_Xref and Name /= Null_Iir then
Xref_Name_1 (Name);
end if;
end Xref_Name;
procedure Move (From : Natural; To : Natural)
is
Tmp : Xref_Type;
begin
Tmp := Xref_Table.Table (To);
Xref_Table.Table (To) := Xref_Table.Table (From);
Xref_Table.Table (From) := Tmp;
end Move;
function Loc_Lt (Op1, Op2 : Natural) return Boolean
is
L1 : constant Location_Type := Xref_Table.Table (Op1).Loc;
L2 : constant Location_Type := Xref_Table.Table (Op2).Loc;
begin
return L1 < L2;
end Loc_Lt;
procedure Sort_By_Location is
begin
GNAT.Heap_Sort_A.Sort (Xref_Table.Last, Move'Access, Loc_Lt'Access);
end Sort_By_Location;
-- Sorting function by ref field.
-- If ref fields are the same, then compare by location.
function Node_Lt (Op1, Op2 : Natural) return Boolean
is
L1, L2 : Location_Type;
N1, N2 : Iir;
K1, K2 : Xref_Kind;
begin
L1 := Get_Location (Get_Xref_Node (Op1));
L2 := Get_Location (Get_Xref_Node (Op2));
if L1 /= L2 then
return L1 < L2;
end if;
-- L1 = L2.
-- Note: nodes of std_standard have the same location. FIXME ?
N1 := Get_Xref_Node (Op1);
N2 := Get_Xref_Node (Op2);
if Vhdl.Nodes."/=" (N1, N2) then
return Vhdl.Nodes_Priv."<" (N1, N2);
end if;
-- Try to get declaration first.
K1 := Get_Xref_Kind (Op1);
K2 := Get_Xref_Kind (Op2);
if K1 /= K2 then
return K1 < K2;
end if;
L1 := Get_Xref_Location (Op1);
L2 := Get_Xref_Location (Op2);
return L1 < L2;
end Node_Lt;
procedure Sort_By_Node_Location is
begin
GNAT.Heap_Sort_A.Sort (Xref_Table.Last, Move'Access, Node_Lt'Access);
end Sort_By_Node_Location;
function Find (Loc : Location_Type) return Xref
is
Low : Xref;
High : Xref;
Mid : Xref;
Mid_Loc : Location_Type;
begin
Low := First_Xref;
High := Xref_Table.Last;
loop
Mid := (Low + High + 1) / 2;
Mid_Loc := Xref_Table.Table (Mid).Loc;
if Loc = Mid_Loc then
return Mid;
end if;
if Mid = Low then
return Bad_Xref;
end if;
if Loc > Mid_Loc then
Low := Mid + 1;
else
High := Mid - 1;
end if;
end loop;
end Find;
procedure Fix_End_Xrefs
is
N : Iir;
begin
for I in First_Xref .. Get_Last_Xref loop
if Get_Xref_Kind (I) = Xref_End then
N := Get_Xref_Node (I);
case Get_Kind (N) is
when Iir_Kind_Function_Body
| Iir_Kind_Procedure_Body =>
Xref_Table.Table (I).Ref := Get_Subprogram_Specification (N);
when others =>
null;
end case;
end if;
end loop;
end Fix_End_Xrefs;
end Vhdl.Xrefs;
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