(* M2GCCDeclare.def declares Modula-2 types to GCC.

Copyright (C) 2001-2023 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.

This file is part of GNU Modula-2.

GNU Modula-2 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 3, or (at your option)
any later version.

GNU Modula-2 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 GNU Modula-2; see the file COPYING3.  If not see
<http://www.gnu.org/licenses/>.  *)

DEFINITION MODULE M2GCCDeclare ;

(*
    Title      : M2GCCDeclare
    Author     : Gaius Mulley
    System     : UNIX (gm2)
    Date       : Sat Jul 17 10:28:43 1999
    Description: declares Modula-2 types to GCC,
                 only declares a type once all subcomponents are known.
*)

FROM SYSTEM IMPORT WORD ;
FROM m2tree IMPORT Tree ;
EXPORT QUALIFIED FoldConstants,
                 DeclareConstant, TryDeclareConstant,
                 DeclareConstructor, TryDeclareConstructor,
                 DeclareLocalVariables, PromoteToString, DeclareLocalVariable,
                 InitDeclarations, StartDeclareScope, EndDeclareScope,
                 DeclareModuleVariables, IsProcedureGccNested,
                 DeclareProcedure, PoisonSymbols, DeclareParameters,
                 CompletelyResolved, MarkExported, PrintSym,
                 ConstantKnownAndUsed,
                 PutToBeSolvedByQuads,
                 GetTypeMin, GetTypeMax,
                 WalkAction, IsAction ;

TYPE
   WalkAction = PROCEDURE (WORD) ;
   IsAction   = PROCEDURE (WORD) : BOOLEAN ;


(*
   FoldConstants - a wrapper for ResolveConstantExpressions.
*)

PROCEDURE FoldConstants (start, end: CARDINAL) ;


(*
   StartDeclareScope - declares types, variables associated with this scope.
*)

PROCEDURE StartDeclareScope (scope: CARDINAL) ;


(*
   EndDeclareScope -
*)

PROCEDURE EndDeclareScope ;


(*
   DeclareParameters -
*)

PROCEDURE DeclareParameters (sym: CARDINAL) ;


(*
   DeclareConstant - if, sym, is a constant then declare it.
                     The constant must be solvable at this point.
*)

PROCEDURE DeclareConstant (tokenno: CARDINAL; sym: CARDINAL) ;


(*
   DeclareConstructor - if, sym, is a constructor then declare it.
                        The constructor must be solvable at this point.
*)

PROCEDURE DeclareConstructor (tokenno: CARDINAL; quad: CARDINAL; sym: CARDINAL) ;


(*
   TryDeclareConstant - try and declare a constant.  If, sym, is a
                        constant try and declare it, if we cannot
                        then enter it into the to do list.
*)

PROCEDURE TryDeclareConstant (tokenno: CARDINAL; sym: CARDINAL) ;


(*
   TryDeclareConstructor - try and declare a constructor.  If, sym, is a
                           constructor try and declare it, if we cannot
                           then enter it into the to do list.
*)

PROCEDURE TryDeclareConstructor (tokenno: CARDINAL; sym: CARDINAL) ;


(*
   DeclareLocalVariables - lists the Local variables for procedure
                           together with their offset.
*)

PROCEDURE DeclareLocalVariables (procedure: CARDINAL) ;


(*
   DeclareLocalVariable - declare a local variable var.
*)

PROCEDURE DeclareLocalVariable (var: CARDINAL) ;


(*
   DeclareProcedure - declares procedure, sym, or all procedures inside
                      module sym.
*)

PROCEDURE DeclareProcedure (sym: WORD) ;


(*
   DeclareModuleVariables - declares Module variables for a module
                            which inside a procedure.
*)

PROCEDURE DeclareModuleVariables (sym: CARDINAL) ;


(*
   IsProcedureGccNested - returns TRUE if procedure, sym, will be considered
                          as nested by GCC.
                          This will occur if either its outer defining scope
                          is a procedure or is a module which is inside a
                          procedure.
*)

PROCEDURE IsProcedureGccNested (sym: CARDINAL) : BOOLEAN ;


(*
   PoisonSymbols - poisons all gcc symbols from procedure, sym.
                   A debugging aid.
*)

PROCEDURE PoisonSymbols (sym: CARDINAL) ;


(*
   PromoteToString - declare, sym, and then promote it to a string.
                     Note that if sym is a single character we do
                          *not* record it as a string
                          but as a char however we always
                          return a string constant.
*)

PROCEDURE PromoteToString (tokenno: CARDINAL; sym: CARDINAL) : Tree ;


(*
   CompletelyResolved - returns TRUE if a symbol has been completely resolved
                        and is not partially declared (such as a record,
                        array or procedure type).
*)

PROCEDURE CompletelyResolved (sym: CARDINAL) : BOOLEAN ;


(*
   ConstantKnownAndUsed -
*)

PROCEDURE ConstantKnownAndUsed (sym: CARDINAL; t: Tree) ;


(*
   PutToBeSolvedByQuads - places, sym, in this list.
*)

PROCEDURE PutToBeSolvedByQuads (sym: CARDINAL) ;


(*
   MarkExported - tell GCC to mark all exported procedures in module sym.
*)

PROCEDURE MarkExported (sym: CARDINAL) ;


(*
   GetTypeMin - returns a symbol corresponding to MIN(type)
*)

PROCEDURE GetTypeMin (type: CARDINAL) : CARDINAL ;


(*
   GetTypeMax - returns a symbol corresponding to MAX(type)
*)

PROCEDURE GetTypeMax (type: CARDINAL) : CARDINAL ;


(*
   PrintSym - prints limited information about a symbol.
*)

PROCEDURE PrintSym (sym: CARDINAL) ;


(*
   InitDeclarations - initializes default types and the source filename.
*)

PROCEDURE InitDeclarations ;


END M2GCCDeclare.