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+--  Semantic analysis pass.
+--  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 Iirs; use Iirs;
+with Types; use Types;
+
+package Sem is
+   --  Semantic analysis for chapters 1, 2, 10 (uses clauses) and 11.
+
+   -- Do the semantic analysis of design unit DESIGN_UNIT.
+   -- Also add a few node or change some nodes, when for exemple an
+   -- identifier is changed into an access to the type.
+   procedure Semantic (Design_Unit: Iir_Design_Unit);
+
+   -- Get the current design unit, ie, the parameter of the procedure semantic.
+   function Get_Current_Design_Unit return Iir_Design_Unit;
+
+   --  Makes the current design unit depends on UNIT.
+   --  UNIT must be either an entity_aspect or a design_unit.
+   procedure Add_Dependence (Unit : Iir);
+
+   --  Add EL in the current design unit list of items to be checked later.
+   procedure Add_Analysis_Checks_List (El : Iir);
+
+   --  INTER_PARENT contains generics and ports interfaces;
+   --  ASSOC_PARENT constains generics and ports map aspects.
+   procedure Sem_Generic_Port_Association_Chain
+     (Inter_Parent : Iir; Assoc_Parent : Iir);
+
+   --  Return TRUE iff the actual of ASSOC can be the formal FORMAL.
+   --  ASSOC must be an association_element_by_expression.
+   function Can_Collapse_Signals (Assoc : Iir; Formal : Iir) return Boolean;
+
+   --  Return TRUE iff LEFT and RIGHT are (in depth) equal.
+   --  This corresponds to conformance rules, LRM 2.7
+   function Are_Trees_Equal (Left, Right : Iir) return Boolean;
+
+   --  Check requirements on number of interfaces for subprogram specification
+   --  SUBPRG for a symbol operator ID.  Requirements only concern operators,
+   --  and are defined in LRM 2.3.1.
+   --  If ID is not an operator name, this subprogram does no checks.
+   --  ID might be different from the identifier of SUBPRG when non object
+   --  aliases are checked.
+   procedure Check_Operator_Requirements (Id : Name_Id; Subprg : Iir);
+
+   --  Semantize an use clause.
+   --  This may adds use clauses to the chain.
+   procedure Sem_Use_Clause (Clauses : Iir_Use_Clause);
+
+   --  Compute and set the hash profile of a subprogram or enumeration clause.
+   procedure Compute_Subprogram_Hash (Subprg : Iir);
+
+   --  LRM 2.1  Subprogram Declarations.
+   procedure Sem_Subprogram_Declaration (Subprg: Iir);
+
+   --  LRM 2.2  Subprogram Bodies.
+   procedure Sem_Subprogram_Body (Subprg: Iir);
+
+   --  Do late analysis checks (pure rules).
+   procedure Sem_Analysis_Checks_List (Unit : Iir_Design_Unit;
+                                       Emit_Warnings : Boolean);
+
+   --  Analyze the uninstantiated package name of DECL, and return the
+   --  package declaration.  Return Null_Iir if the name doesn't denote an
+   --  uninstantiated package.
+   function Sem_Uninstantiated_Package_Name (Decl : Iir) return Iir;
+
+end Sem;