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+--  Semantic analysis.
+--  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 GCC; 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;
+
+package Sem_Stmts is
+   --  Semantize declarations and concurrent statements of BLK, which is
+   --  either an architecture_declaration or a block_statement.
+   --  If SEM_DECLS is true, then semantize the declarations of BLK.
+   procedure Sem_Block (Blk: Iir; Sem_Decls : Boolean);
+
+   procedure Sem_Concurrent_Statement_Chain
+     (Parent : Iir; Is_Passive : Boolean);
+
+   --  Some signals are implicitly declared.  This is the case for signals
+   --  declared by an attribute ('stable, 'quiet and 'transaction).
+   --  Note: guard signals are also implicitly declared, but with a guard
+   --   expression, which is located.
+   --  Since these signals need resources and are not easily located (can be
+   --  nearly in every expression), it is useful to add a node into a
+   --  declaration list to declare them.
+   --  However, only a few declaration_list can declare signals.  These
+   --  declarations lists must register and unregister themselves with
+   --  push_declarative_region_with_signals and
+   --  pop_declarative_region_with_signals.
+   type Implicit_Signal_Declaration_Type is private;
+
+   procedure Push_Signals_Declarative_Part
+     (Cell: out Implicit_Signal_Declaration_Type; Decls_Parent : Iir);
+
+   procedure Pop_Signals_Declarative_Part
+     (Cell: in Implicit_Signal_Declaration_Type);
+
+   -- Declare an implicit signal.
+   procedure Add_Declaration_For_Implicit_Signal (Sig : Iir);
+
+   --  Semantize declaration chain and sequential statement chain
+   --  of BODY_PARENT.
+   --  DECL is the declaration for these chains (DECL is the declaration, which
+   --   is different from the bodies).
+   --  This is used by processes and subprograms semantization.
+   procedure Sem_Sequential_Statements (Decl : Iir; Body_Parent : Iir);
+
+   -- Get the current subprogram or process.
+   function Get_Current_Subprogram return Iir;
+   pragma Inline (Get_Current_Subprogram);
+
+   --  Get the current concurrent statement, or NULL_IIR if none.
+   function Get_Current_Concurrent_Statement return Iir;
+   pragma Inline (Get_Current_Concurrent_Statement);
+
+   --  Add a driver for SIG.
+   --  STMT is used in case of error (it is the statement that creates the
+   --   driver).
+   --  Do nothing if:
+   --    The current statement list does not belong to a process,
+   --    SIG is a formal signal interface.
+   procedure Sem_Add_Driver (Sig : Iir; Stmt : Iir);
+private
+   type Implicit_Signal_Declaration_Type is record
+      Decls_Parent : Iir;
+      Last_Decl : Iir;
+   end record;
+
+end Sem_Stmts;