m3tk/src/sem/M3CExternal.m3

MODULE M3CExternal;
************************************************************************* Copyright (C) Olivetti 1989 All Rights reserved Use and copy of this software and preparation of derivative works based upon this software are permitted to any person, provided this same copyright notice and the following Olivetti warranty disclaimer are included in any copy of the software or any modification thereof or derivative work therefrom made by any person. This software is made available AS IS and Olivetti disclaims all warranties with respect to this software, whether expressed or implied under any law, including all implied warranties of merchantibility and fitness for any purpose. In no event shall Olivetti be liable for any damages whatsoever resulting from loss of use, data or profits or otherwise arising out of or in connection with the use or performance of this software. ************************************************************************* 

IMPORT M3AST, M3AST_AS, M3AST_PG;

IMPORT M3AST_AS_F, M3AST_SM_F, M3AST_PG_F;

IMPORT SeqM3AST_AS_Const_decl, SeqM3AST_AS_Exc_decl, SeqM3AST_AS_TYPE_DECL;

IMPORT M3ASTNext;
IMPORT M3Error;

PROCEDURE Set(an: M3AST.NODE; cu: M3AST_AS.Compilation_Unit) RAISES {}=
  VAR
    isModule: BOOLEAN;
    unitExternal, external: M3AST_PG.External_NULL;
    ed: M3AST_PG.EXTERNAL_DECL;
  BEGIN
    IF NOT M3AST_PG.IsA_EXTERNAL_DECL(an, ed) THEN RETURN END;

    TYPECASE cu.as_root OF <*NOWARN*>
    | M3AST_AS.Interface(interface) =>
        isModule := FALSE;
        unitExternal := interface.vEXTERNAL_DECL.pg_external;
    | M3AST_AS.Module =>
        isModule := TRUE;
        unitExternal := NIL;
    END;

    external := ed.pg_external;
    IF external # NIL THEN
      IF isModule THEN
        M3Error.Report(an, "EXTERNAL is not allowed in a module");
      END; (* if *)
    ELSE
      external := unitExternal;
    END; (* if *)

    TYPECASE an OF <*NOWARN*>
    | M3AST_AS.Interface(interface) =>
        NARROW(interface.as_id, M3AST_AS.Interface_id).vEXTERNAL_ID.pg_external :=
            external;
    | M3AST_AS.Proc_decl(proc_decl) =>
        proc_decl.as_id.vEXTERNAL_ID.pg_external := external;
    | M3AST_AS.Var_decl_s(var_decl_s) =>
        VAR
          iter := M3ASTNext.NewIterVar(
              var_decl_s.as_var_decl_s);
          varId: M3AST_AS.Var_id;
        BEGIN
          WHILE M3ASTNext.Var(iter, varId) DO
            varId.vEXTERNAL_ID.pg_external := external;
          END; (* while *)
        END;
    | M3AST_AS.Const_decl_s(const_decl_s) =>
        VAR
          iter := SeqM3AST_AS_Const_decl.NewIter(
              const_decl_s.as_const_decl_s);
          constDecl: M3AST_AS.Const_decl;
        BEGIN
          WHILE SeqM3AST_AS_Const_decl.Next(iter, constDecl) DO
            constDecl.as_id.vEXTERNAL_ID.pg_external := external;
          END; (* while *)
        END;
    | M3AST_AS.Exc_decl_s(exc_decl_s) =>
        VAR
          iter := SeqM3AST_AS_Exc_decl.NewIter(
              exc_decl_s.as_exc_decl_s);
          excDecl: M3AST_AS.Exc_decl;
        BEGIN
          WHILE SeqM3AST_AS_Exc_decl.Next(iter, excDecl) DO
            excDecl.as_id.vEXTERNAL_ID.pg_external := external;
          END; (* while *)
        END;
    | M3AST_AS.Type_decl_s(type_decl_s) =>
        VAR
          iter := SeqM3AST_AS_TYPE_DECL.NewIter(
              type_decl_s.as_type_decl_s);
          typeDecl: M3AST_AS.TYPE_DECL;
        BEGIN
          WHILE SeqM3AST_AS_TYPE_DECL.Next(iter, typeDecl) DO
            TYPECASE typeDecl OF <*NOWARN*>
            | M3AST_AS.Concrete_decl(concDecl) =>
                concDecl.as_id.vEXTERNAL_ID.pg_external := external;
            | M3AST_AS.Subtype_decl(subtypeDecl) =>
                subtypeDecl.as_id.vEXTERNAL_ID.pg_external := external;
            END;
          END; (* while *)
        END;
    END; (* case *)
  END Set;

BEGIN
END M3CExternal.
interface M3AST is in: