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------------------------------------------------------------------------------

--                                                                          --

--                         GNAT COMPILER COMPONENTS                         --

--                                                                          --

--                               B C H E C K                                --

--                                                                          --

--                                 B o d y                                  --

--                                                                          --

--          Copyright (C) 1992-2009, Free Software Foundation, Inc.         --

--                                                                          --

-- GNAT is free software;  you can  redistribute it  and/or modify it under --

-- terms of the  GNU General Public License as published  by the Free Soft- --

-- ware  Foundation;  either version 3,  or (at your option) any later ver- --

-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --

-- OUT 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  distributed with GNAT; see file COPYING3.  If not, go to --

-- http://www.gnu.org/licenses for a complete copy of the license.          --

--                                                                          --

-- GNAT was originally developed  by the GNAT team at  New York University. --

-- Extensive contributions were provided by Ada Core Technologies Inc.      --

--                                                                          --

------------------------------------------------------------------------------

with ALI;      use ALI;

with ALI.Util; use ALI.Util;

with Binderr;  use Binderr;

with Butil;    use Butil;

with Casing;   use Casing;

with Fname;    use Fname;

with Namet;    use Namet;

with Opt;      use Opt;

with Osint;

with Output;   use Output;

with Rident;   use Rident;

with Types;    use Types;

package body Bcheck is

   -----------------------

   -- Local Subprograms --

   -----------------------

   --  The following checking subprograms make up the parts of the

   --  configuration consistency check. See bodies for details of checks.

   procedure Check_Consistent_Dispatching_Policy;

   procedure Check_Consistent_Dynamic_Elaboration_Checking;

   procedure Check_Consistent_Floating_Point_Format;

   procedure Check_Consistent_Interrupt_States;

   procedure Check_Consistent_Locking_Policy;

   procedure Check_Consistent_Normalize_Scalars;

   procedure Check_Consistent_Optimize_Alignment;

   procedure Check_Consistent_Queuing_Policy;

   procedure Check_Consistent_Restrictions;

   procedure Check_Consistent_Restriction_No_Default_Initialization;

   procedure Check_Consistent_Zero_Cost_Exception_Handling;

   procedure Consistency_Error_Msg (Msg : String);

   --  Produce an error or a warning message, depending on whether an

   --  inconsistent configuration is permitted or not.

   function Same_Unit (U1 : Unit_Name_Type; U2 : Name_Id) return Boolean;

   --  Used to compare two unit names for No_Dependence checks. U1 is in

   --  standard unit name format, and U2 is in literal form with periods.

   -------------------------------------

   -- Check_Configuration_Consistency --

   -------------------------------------

   procedure Check_Configuration_Consistency is

   begin

      if Float_Format_Specified /= ' ' then

         Check_Consistent_Floating_Point_Format;

      end if;

      if Queuing_Policy_Specified /= ' ' then

         Check_Consistent_Queuing_Policy;

      end if;

      if Locking_Policy_Specified /= ' ' then

         Check_Consistent_Locking_Policy;

      end if;

      if Zero_Cost_Exceptions_Specified then

         Check_Consistent_Zero_Cost_Exception_Handling;

      end if;

      Check_Consistent_Normalize_Scalars;

      Check_Consistent_Optimize_Alignment;

      Check_Consistent_Dynamic_Elaboration_Checking;

      Check_Consistent_Restrictions;

      Check_Consistent_Restriction_No_Default_Initialization;

      Check_Consistent_Interrupt_States;

      Check_Consistent_Dispatching_Policy;

   end Check_Configuration_Consistency;

   -----------------------

   -- Check_Consistency --

   -----------------------

   procedure Check_Consistency is

      Src : Source_Id;

      --  Source file Id for this Sdep entry

      ALI_Path_Id : File_Name_Type;

   begin

      --  First, we go through the source table to see if there are any cases

      --  in which we should go after source files and compute checksums of

      --  the source files. We need to do this for any file for which we have

      --  mismatching time stamps and (so far) matching checksums.

      for S in Source.First .. Source.Last loop

         --  If all time stamps for a file match, then there is nothing to

         --  do, since we will not be checking checksums in that case anyway

         if Source.Table (S).All_Timestamps_Match then

            null;

         --  If we did not find the source file, then we can't compute its

         --  checksum anyway. Note that when we have a time stamp mismatch,

         --  we try to find the source file unconditionally (i.e. if

         --  Check_Source_Files is False).

         elsif not Source.Table (S).Source_Found then

            null;

         --  If we already have non-matching or missing checksums, then no

         --  need to try going after source file, since we won't trust the

         --  checksums in any case.

         elsif not Source.Table (S).All_Checksums_Match then

            null;

         --  Now we have the case where we have time stamp mismatches, and

         --  the source file is around, but so far all checksums match. This

         --  is the case where we need to compute the checksum from the source

         --  file, since otherwise we would ignore the time stamp mismatches,

         --  and that is wrong if the checksum of the source does not agree

         --  with the checksums in the ALI files.

         elsif Check_Source_Files then

            if not Checksums_Match

              (Source.Table (S).Checksum,

               Get_File_Checksum (Source.Table (S).Sfile))

            then

               Source.Table (S).All_Checksums_Match := False;

            end if;

         end if;

      end loop;

      --  Loop through ALI files

      ALIs_Loop : for A in ALIs.First .. ALIs.Last loop

         --  Loop through Sdep entries in one ALI file

         Sdep_Loop : for D in

           ALIs.Table (A).First_Sdep .. ALIs.Table (A).Last_Sdep

         loop

            if Sdep.Table (D).Dummy_Entry then

               goto Continue;

            end if;

            Src := Source_Id (Get_Name_Table_Info (Sdep.Table (D).Sfile));

            --  If the time stamps match, or all checksums match, then we

            --  are OK, otherwise we have a definite error.

            if Sdep.Table (D).Stamp /= Source.Table (Src).Stamp

              and then not Source.Table (Src).All_Checksums_Match

            then

               Error_Msg_File_1 := ALIs.Table (A).Sfile;

               Error_Msg_File_2 := Sdep.Table (D).Sfile;

               --  Two styles of message, depending on whether or not

               --  the updated file is the one that must be recompiled

               if Error_Msg_File_1 = Error_Msg_File_2 then

                  if Tolerate_Consistency_Errors then

                     Error_Msg

                        ("?{ has been modified and should be recompiled");

                  else

                     Error_Msg

                       ("{ has been modified and must be recompiled");

                  end if;

               else

                  ALI_Path_Id :=

                    Osint.Full_Lib_File_Name (ALIs.Table (A).Afile);

                  if Osint.Is_Readonly_Library (ALI_Path_Id) then

                     if Tolerate_Consistency_Errors then

                        Error_Msg ("?{ should be recompiled");

                        Error_Msg_File_1 := ALI_Path_Id;

                        Error_Msg ("?({ is obsolete and read-only)");

                     else

                        Error_Msg ("{ must be compiled");

                        Error_Msg_File_1 := ALI_Path_Id;

                        Error_Msg ("({ is obsolete and read-only)");

                     end if;

                  elsif Tolerate_Consistency_Errors then

                     Error_Msg

                       ("?{ should be recompiled ({ has been modified)");

                  else

                     Error_Msg ("{ must be recompiled ({ has been modified)");

                  end if;

               end if;

               if (not Tolerate_Consistency_Errors) and Verbose_Mode then

                  Error_Msg_File_1 := Sdep.Table (D).Sfile;

                  Error_Msg

                    ("{ time stamp " & String (Source.Table (Src).Stamp));

                  Error_Msg_File_1 := Sdep.Table (D).Sfile;

                  --  Something wrong here, should be different file ???

                  Error_Msg

                    (" conflicts with { timestamp " &

                     String (Sdep.Table (D).Stamp));

               end if;

               --  Exit from the loop through Sdep entries once we find one

               --  that does not match.

               exit Sdep_Loop;

            end if;

         <<Continue>>

            null;

         end loop Sdep_Loop;

      end loop ALIs_Loop;

   end Check_Consistency;

   -----------------------------------------

   -- Check_Consistent_Dispatching_Policy --

   -----------------------------------------

   --  The rule is that all files for which the dispatching policy is

   --  significant must meet the following rules:

   --    1. All files for which a task dispatching policy is significant must

   --    be compiled with the same setting.

   --    2. If a partition contains one or more Priority_Specific_Dispatching

   --    pragmas it cannot contain a Task_Dispatching_Policy pragma.

   --    3. No overlap is allowed in the priority ranges specified in

   --    Priority_Specific_Dispatching pragmas within the same partition.

   --    4. If a partition contains one or more Priority_Specific_Dispatching

   --    pragmas then the Ceiling_Locking policy is the only one allowed for

   --    the partition.

   procedure Check_Consistent_Dispatching_Policy is

      Max_Prio : Nat := 0;

      --  Maximum priority value for which a Priority_Specific_Dispatching

      --  pragma has been specified.

      TDP_Pragma_Afile : ALI_Id := No_ALI_Id;

      --  ALI file where a Task_Dispatching_Policy pragma appears

   begin

      --  Consistency checks in units specifying a Task_Dispatching_Policy

      if Task_Dispatching_Policy_Specified /= ' ' then

         Find_Policy : for A1 in ALIs.First .. ALIs.Last loop

            if ALIs.Table (A1).Task_Dispatching_Policy /= ' ' then

               --  Store the place where the first task dispatching pragma

               --  appears. We may need this value for issuing consistency

               --  errors if Priority_Specific_Dispatching pragmas are used.

               TDP_Pragma_Afile := A1;

               Check_Policy : declare

                  Policy : constant Character :=

                             ALIs.Table (A1).Task_Dispatching_Policy;

               begin

                  for A2 in A1 + 1 .. ALIs.Last loop

                     if ALIs.Table (A2).Task_Dispatching_Policy /= ' '

                          and then

                        ALIs.Table (A2).Task_Dispatching_Policy /= Policy

                     then

                        Error_Msg_File_1 := ALIs.Table (A1).Sfile;

                        Error_Msg_File_2 := ALIs.Table (A2).Sfile;

                        Consistency_Error_Msg

                          ("{ and { compiled with different task" &

                           " dispatching policies");

                        exit Find_Policy;

                     end if;

                  end loop;

               end Check_Policy;

               exit Find_Policy;

            end if;

         end loop Find_Policy;

      end if;

      --  If no Priority_Specific_Dispatching entries, nothing else to do

      if Specific_Dispatching.Last >= Specific_Dispatching.First then

         --  Find out the maximum priority value for which one of the

         --  Priority_Specific_Dispatching pragmas applies.

         Max_Prio := 0;

         for J in Specific_Dispatching.First .. Specific_Dispatching.Last loop

            if Specific_Dispatching.Table (J).Last_Priority > Max_Prio then

               Max_Prio := Specific_Dispatching.Table (J).Last_Priority;

            end if;

         end loop;

         --  Now establish tables to be used for consistency checking

         declare

            --  The following record type is used to record locations of the

            --  Priority_Specific_Dispatching pragmas applying to the Priority.

            type Specific_Dispatching_Entry is record

               Dispatching_Policy : Character := ' ';

               --  First character (upper case) of corresponding policy name

               Afile : ALI_Id := No_ALI_Id;

               --  ALI file that generated Priority Specific Dispatching

               --  entry for consistency message.

               Loc : Nat := 0;

               --  Line numbers from Priority_Specific_Dispatching pragma

            end record;

            PSD_Table  : array (0 .. Max_Prio) of Specific_Dispatching_Entry :=

                           (others => Specific_Dispatching_Entry'

                              (Dispatching_Policy => ' ',

                               Afile              => No_ALI_Id,

                               Loc                => 0));

            --  Array containing an entry per priority containing the location

            --  where there is a Priority_Specific_Dispatching pragma that

            --  applies to the priority.

         begin

            for F in ALIs.First .. ALIs.Last loop

               for K in ALIs.Table (F).First_Specific_Dispatching ..

                        ALIs.Table (F).Last_Specific_Dispatching

               loop

                  declare

                     DTK : Specific_Dispatching_Record

                             renames Specific_Dispatching.Table (K);

                  begin

                     --  Check whether pragma Task_Dispatching_Policy and

                     --  pragma Priority_Specific_Dispatching are used in the

                     --  same partition.

                     if Task_Dispatching_Policy_Specified /= ' ' then

                        Error_Msg_File_1 := ALIs.Table (F).Sfile;

                        Error_Msg_File_2 :=

                          ALIs.Table (TDP_Pragma_Afile).Sfile;

                        Error_Msg_Nat_1 := DTK.PSD_Pragma_Line;

                        Consistency_Error_Msg

                          ("Priority_Specific_Dispatching at {:#" &

                           " incompatible with Task_Dispatching_Policy at {");

                     end if;

                     --  Ceiling_Locking must also be specified for a partition

                     --  with at least one Priority_Specific_Dispatching

                     --  pragma.

                     if Locking_Policy_Specified /= ' '

                       and then Locking_Policy_Specified /= 'C'

                     then

                        for A in ALIs.First .. ALIs.Last loop

                           if ALIs.Table (A).Locking_Policy /= ' '

                             and then ALIs.Table (A).Locking_Policy /= 'C'

                           then

                              Error_Msg_File_1 := ALIs.Table (F).Sfile;

                              Error_Msg_File_2 := ALIs.Table (A).Sfile;

                              Error_Msg_Nat_1  := DTK.PSD_Pragma_Line;

                              Consistency_Error_Msg

                                ("Priority_Specific_Dispatching at {:#" &

                                 " incompatible with Locking_Policy at {");

                           end if;

                        end loop;

                     end if;

                     --  Check overlapping priority ranges

                     Find_Overlapping : for Prio in

                       DTK.First_Priority .. DTK.Last_Priority

                     loop

                        if PSD_Table (Prio).Afile = No_ALI_Id then

                           PSD_Table (Prio) :=

                             (Dispatching_Policy => DTK.Dispatching_Policy,

                              Afile => F, Loc => DTK.PSD_Pragma_Line);

                        elsif PSD_Table (Prio).Dispatching_Policy /=

                              DTK.Dispatching_Policy

                        then

                           Error_Msg_File_1 :=

                             ALIs.Table (PSD_Table (Prio).Afile).Sfile;

                           Error_Msg_File_2 := ALIs.Table (F).Sfile;

                           Error_Msg_Nat_1  := PSD_Table (Prio).Loc;

                           Error_Msg_Nat_2  := DTK.PSD_Pragma_Line;

                           Consistency_Error_Msg

                             ("overlapping priority ranges at {:# and {:#");

                           exit Find_Overlapping;

                        end if;

                     end loop Find_Overlapping;

                  end;

               end loop;

            end loop;

         end;

      end if;

   end Check_Consistent_Dispatching_Policy;

   ---------------------------------------------------

   -- Check_Consistent_Dynamic_Elaboration_Checking --

   ---------------------------------------------------

   --  The rule here is that if a unit has dynamic elaboration checks,

   --  then any unit it withs must meeting one of the following criteria:

   --    1. There is a pragma Elaborate_All for the with'ed unit

   --    2. The with'ed unit was compiled with dynamic elaboration checks

   --    3. The with'ed unit has pragma Preelaborate or Pure

   --    4. It is an internal GNAT unit (including children of GNAT)

   procedure Check_Consistent_Dynamic_Elaboration_Checking is

   begin

      if Dynamic_Elaboration_Checks_Specified then

         for U in First_Unit_Entry .. Units.Last loop

            declare

               UR : Unit_Record renames Units.Table (U);

            begin

               if UR.Dynamic_Elab then

                  for W in UR.First_With .. UR.Last_With loop

                     declare

                        WR : With_Record renames Withs.Table (W);

                     begin

                        if Get_Name_Table_Info (WR.Uname) /= 0 then

                           declare

                              WU : Unit_Record renames

                                     Units.Table

                                       (Unit_Id

                                         (Get_Name_Table_Info (WR.Uname)));

                           begin

                              --  Case 1. Elaborate_All for with'ed unit

                              if WR.Elaborate_All then

                                 null;

                              --  Case 2. With'ed unit has dynamic elab checks

                              elsif WU.Dynamic_Elab then

                                 null;

                              --  Case 3. With'ed unit is Preelaborate or Pure

                              elsif WU.Preelab or else WU.Pure then

                                 null;

                              --  Case 4. With'ed unit is internal file

                              elsif Is_Internal_File_Name (WU.Sfile) then

                                 null;

                              --  Issue warning, not one of the safe cases

                              else

                                 Error_Msg_File_1 := UR.Sfile;

                                 Error_Msg

                                   ("?{ has dynamic elaboration checks " &

                                                                 "and with's");

                                 Error_Msg_File_1 := WU.Sfile;

                                 Error_Msg

                                   ("?  { which has static elaboration " &

                                                                     "checks");

                                 Warnings_Detected := Warnings_Detected - 1;

                              end if;

                           end;

                        end if;

                     end;

                  end loop;

               end if;

            end;

         end loop;

      end if;

   end Check_Consistent_Dynamic_Elaboration_Checking;

   --------------------------------------------

   -- Check_Consistent_Floating_Point_Format --

   --------------------------------------------

   --  The rule is that all files must be compiled with the same setting

   --  for the floating-point format.

   procedure Check_Consistent_Floating_Point_Format is

   begin

      --  First search for a unit specifying a floating-point format and then

      --  check all remaining units against it.

      Find_Format : for A1 in ALIs.First .. ALIs.Last loop

         if ALIs.Table (A1).Float_Format /= ' ' then

            Check_Format : declare

               Format : constant Character := ALIs.Table (A1).Float_Format;

            begin

               for A2 in A1 + 1 .. ALIs.Last loop

                  if ALIs.Table (A2).Float_Format /= Format then

                     Error_Msg_File_1 := ALIs.Table (A1).Sfile;

                     Error_Msg_File_2 := ALIs.Table (A2).Sfile;

                     Consistency_Error_Msg

                       ("{ and { compiled with different " &

                        "floating-point representations");

                     exit Find_Format;

                  end if;

               end loop;

            end Check_Format;

            exit Find_Format;

         end if;

      end loop Find_Format;

   end Check_Consistent_Floating_Point_Format;

   ---------------------------------------

   -- Check_Consistent_Interrupt_States --

   ---------------------------------------

   --  The rule is that if the state of a given interrupt is specified

   --  in more than one unit, it must be specified with a consistent state.

   procedure Check_Consistent_Interrupt_States is

      Max_Intrup : Nat;

   begin

      --  If no Interrupt_State entries, nothing to do

      if Interrupt_States.Last < Interrupt_States.First then

         return;

      end if;

      --  First find out the maximum interrupt value

      Max_Intrup := 0;

      for J in Interrupt_States.First .. Interrupt_States.Last loop

         if Interrupt_States.Table (J).Interrupt_Id > Max_Intrup then

            Max_Intrup := Interrupt_States.Table (J).Interrupt_Id;

         end if;

      end loop;

      --  Now establish tables to be used for consistency checking

      declare

         Istate : array (0 .. Max_Intrup) of Character := (others => 'n');

         --  Interrupt state entries, 'u'/'s'/'r' or 'n' to indicate an

         --  entry that has not been set.

         Afile : array (0 .. Max_Intrup) of ALI_Id;

         --  ALI file that generated Istate entry for consistency message

         Loc : array (0 .. Max_Intrup) of Nat;

         --  Line numbers from IS pragma generating Istate entry

         Inum : Nat;

         --  Interrupt number from entry being tested

         Stat : Character;

         --  Interrupt state from entry being tested

         Lnum : Nat;

         --  Line number from entry being tested

      begin

         for F in ALIs.First .. ALIs.Last loop

            for K in ALIs.Table (F).First_Interrupt_State ..

                     ALIs.Table (F).Last_Interrupt_State

            loop

               Inum := Interrupt_States.Table (K).Interrupt_Id;

               Stat := Interrupt_States.Table (K).Interrupt_State;

               Lnum := Interrupt_States.Table (K).IS_Pragma_Line;

               if Istate (Inum) = 'n' then

                  Istate (Inum) := Stat;

                  Afile  (Inum) := F;

                  Loc    (Inum) := Lnum;

               elsif Istate (Inum) /= Stat then

                  Error_Msg_File_1 := ALIs.Table (Afile (Inum)).Sfile;

                  Error_Msg_File_2 := ALIs.Table (F).Sfile;

                  Error_Msg_Nat_1  := Loc (Inum);

                  Error_Msg_Nat_2  := Lnum;

                  Consistency_Error_Msg

                    ("inconsistent interrupt states at {:# and {:#");

               end if;

            end loop;

         end loop;

      end;

   end Check_Consistent_Interrupt_States;

   -------------------------------------

   -- Check_Consistent_Locking_Policy --

   -------------------------------------

   --  The rule is that all files for which the locking policy is

   --  significant must be compiled with the same setting.

   procedure Check_Consistent_Locking_Policy is

   begin

      --  First search for a unit specifying a policy and then

      --  check all remaining units against it.

      Find_Policy : for A1 in ALIs.First .. ALIs.Last loop

         if ALIs.Table (A1).Locking_Policy /= ' ' then

            Check_Policy : declare

               Policy : constant Character := ALIs.Table (A1).Locking_Policy;

            begin

               for A2 in A1 + 1 .. ALIs.Last loop

                  if ALIs.Table (A2).Locking_Policy /= ' '

                       and then

                     ALIs.Table (A2).Locking_Policy /= Policy

                  then

                     Error_Msg_File_1 := ALIs.Table (A1).Sfile;

                     Error_Msg_File_2 := ALIs.Table (A2).Sfile;

                     Consistency_Error_Msg

                       ("{ and { compiled with different locking policies");

                     exit Find_Policy;

                  end if;

               end loop;

            end Check_Policy;

            exit Find_Policy;

         end if;

      end loop Find_Policy;

   end Check_Consistent_Locking_Policy;

   ----------------------------------------

   -- Check_Consistent_Normalize_Scalars --

   ----------------------------------------

   --  The rule is that if any unit is compiled with Normalized_Scalars,

   --  then all other units in the partition must also be compiled with

   --  Normalized_Scalars in effect.

   --  There is some issue as to whether this consistency check is desirable,

   --  it is certainly required at the moment by the RM. We should keep a watch

   --  on the ARG and HRG deliberations here. GNAT no longer depends on this

   --  consistency (it used to do so, but that is no longer the case, since

   --  pragma Initialize_Scalars pragma does not require consistency.)

   procedure Check_Consistent_Normalize_Scalars is

   begin

      if Normalize_Scalars_Specified and No_Normalize_Scalars_Specified then

         Consistency_Error_Msg

              ("some but not all files compiled with Normalize_Scalars");

         Write_Eol;

         Write_Str ("files compiled with Normalize_Scalars");

         Write_Eol;

         for A1 in ALIs.First .. ALIs.Last loop

            if ALIs.Table (A1).Normalize_Scalars then

               Write_Str ("  ");

               Write_Name (ALIs.Table (A1).Sfile);

               Write_Eol;

            end if;

         end loop;

         Write_Eol;

         Write_Str ("files compiled without Normalize_Scalars");

         Write_Eol;

         for A1 in ALIs.First .. ALIs.Last loop

            if not ALIs.Table (A1).Normalize_Scalars then

               Write_Str ("  ");

               Write_Name (ALIs.Table (A1).Sfile);

               Write_Eol;

            end if;

         end loop;

      end if;

   end Check_Consistent_Normalize_Scalars;

   -----------------------------------------

   -- Check_Consistent_Optimize_Alignment --

   -----------------------------------------

   --  The rule is that all units which depend on the global default setting

   --  of Optimize_Alignment must be compiled with the same setting for this

   --  default. Units which specify an explicit local value for this setting

   --  are exempt from the consistency rule (this includes all internal units).

   procedure Check_Consistent_Optimize_Alignment is

      OA_Setting : Character := ' ';

      --  Reset when we find a unit that depends on the default and does

      --  not have a local specification of the Optimize_Alignment setting.

      OA_Unit : Unit_Id;

      --  Id of unit from which OA_Setting was set

      C : Character;

   begin

      for U in First_Unit_Entry .. Units.Last loop

         C := Units.Table (U).Optimize_Alignment;

         if C /= 'L' then

            if OA_Setting = ' ' then

               OA_Setting := C;

               OA_Unit := U;

            elsif OA_Setting = C then

               null;

            else

               Error_Msg_Unit_1 := Units.Table (OA_Unit).Uname;

               Error_Msg_Unit_2 := Units.Table (U).Uname;

               Consistency_Error_Msg

                 ("$ and $ compiled with different "

                  & "default Optimize_Alignment settings");

               return;

            end if;

         end if;

      end loop;

   end Check_Consistent_Optimize_Alignment;

   -------------------------------------

   -- Check_Consistent_Queuing_Policy --

   -------------------------------------

   --  The rule is that all files for which the queuing policy is

   --  significant must be compiled with the same setting.

   procedure Check_Consistent_Queuing_Policy is

   begin

      --  First search for a unit specifying a policy and then

      --  check all remaining units against it.

      Find_Policy : for A1 in ALIs.First .. ALIs.Last loop

         if ALIs.Table (A1).Queuing_Policy /= ' ' then

            Check_Policy : declare

               Policy : constant Character := ALIs.Table (A1).Queuing_Policy;

            begin

               for A2 in A1 + 1 .. ALIs.Last loop

                  if ALIs.Table (A2).Queuing_Policy /= ' '

                       and then

                     ALIs.Table (A2).Queuing_Policy /= Policy

                  then