c641001.a

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-- C641001.A
--
--                             Grant of Unlimited Rights
--
--     Under contracts F33600-87-D-0337, F33600-84-D-0280, MDA903-79-C-0687,
--     F08630-91-C-0015, and DCA100-97-D-0025, the U.S. Government obtained 
--     unlimited rights in the software and documentation contained herein.
--     Unlimited rights are defined in DFAR 252.227-7013(a)(19).  By making 
--     this public release, the Government intends to confer upon all 
--     recipients unlimited rights  equal to those held by the Government.  
--     These rights include rights to use, duplicate, release or disclose the 
--     released technical data and computer software in whole or in part, in 
--     any manner and for any purpose whatsoever, and to have or permit others 
--     to do so.
--
--                                    DISCLAIMER
--
--     ALL MATERIALS OR INFORMATION HEREIN RELEASED, MADE AVAILABLE OR
--     DISCLOSED ARE AS IS.  THE GOVERNMENT MAKES NO EXPRESS OR IMPLIED 
--     WARRANTY AS TO ANY MATTER WHATSOEVER, INCLUDING THE CONDITIONS OF THE
--     SOFTWARE, DOCUMENTATION OR OTHER INFORMATION RELEASED, MADE AVAILABLE 
--     OR DISCLOSED, OR THE OWNERSHIP, MERCHANTABILITY, OR FITNESS FOR A
--     PARTICULAR PURPOSE OF SAID MATERIAL.
--*
--
-- OBJECTIVE:
--      Check that actual parameters passed by reference are view converted
--      to the nominal subtype of the formal parameter.
--
-- TEST DESCRIPTION:
--      Check that sliding is allowed for formal parameters, especially
--      check cases that would have caused errors in Ada'83.
--      Check that length check for a formal parameter (esp out mode)
--      is performed before the call, not after.
--
--  notes: 6.2; by reference ::= tagged, task, protected,
--                       limited (nonprivate), or composite containing such
--         4.6; view conversion
--
--
-- CHANGE HISTORY:
--      26 JAN 96   SAIC   Initial version
--      04 NOV 96   SAIC   Commentary revision for release 2.1
--      27 FEB 97   PWB.CTA Corrected reference to the wrong string
--!

----------------------------------------------------------------- C641001_0

package C641001_0 is

  subtype String_10 is String(1..10);

  procedure Check_String_10( S : out String_10; Start, Stop: Natural );

  procedure Check_Illegal_Slice_Reference( Slice_Passed : in out String;
                                           Index: Natural );

  type Tagged_Data(Bound: Natural) is tagged record
    Data_Item : String(1..Bound) := (others => '*');
  end record;

  type Tag_List is array(Natural range <>) of Tagged_Data(5);

  subtype Tag_List_10 is Tag_List(1..10);

  procedure Check_Tag_Slice( TL : in out Tag_List_10 );

  procedure Check_Out_Tagged_Data( Formal : out Tagged_Data );

end C641001_0;

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

with Report;
with TCTouch;
package body C641001_0 is

  String_Data : constant String := "1234567890ABCDEFGHIJKLMNOPQRSTUVWXYZ";

  procedure Check_String_10( S : out String_10; Start, Stop: Natural ) is
  begin
    if S'Length /= 10 then
      Report.Failed("Length check not performed prior to execution");
    end if;
    S := String_Data(Start..Stop);
  exception
    when others => Report.Failed("Exception encountered in Check_String_10");
  end Check_String_10;

  procedure Check_Illegal_Slice_Reference( Slice_Passed : in out String;
                                           Index: Natural ) is
  begin
    -- essentially "do-nothing" for optimization foilage...
    if Slice_Passed(Index) in Character then
    -- Intent is    ^^^^^  should raise Constraint_Error
      Report.Failed("Illegal Slice provided legal character");
    else
      Report.Failed("Illegal Slice provided illegal character");
    end if;
  exception
    when Constraint_Error =>
      null; -- expected case
    when others =>
      Report.Failed("Wrong exception in Check_Illegal_Slice_Reference");
  end Check_Illegal_Slice_Reference;

  procedure Check_Tag_Slice( TL : in out Tag_List_10 ) is
    -- if the view conversion is not performed, one of the following checks
    -- will fail (given data passed as 0..9 and then 2..11)
  begin
    Check_Under_Index:  -- index 0 should raise C_E
    begin
      TCTouch.Assert( TL(Report.Ident_Int(0)).Data_Item = "*****",
                      "Index 0 (illegal); bad data" );
      Report.Failed("Index 0 did not raise Constraint_Error");
    exception
      when Constraint_Error =>
        null; -- expected case
      when others =>
        Report.Failed("Wrong exception in Check_Under_Index ");
    end Check_Under_Index;

    Check_Over_Index:  -- index 11 should raise C_E
    begin
      TCTouch.Assert( TL(Report.Ident_Int(11)).Data_Item = "*****",
                      "Index 11 (illegal); bad data" );
      Report.Failed("Index 11 did not raise Constraint_Error");
    exception
      when Constraint_Error =>
        null; -- expected case
      when others =>
        Report.Failed("Wrong exception in Check_Over_Index ");
    end Check_Over_Index;

  end Check_Tag_Slice;

  procedure Check_Out_Tagged_Data( Formal : out Tagged_Data ) is
  begin
    TCTouch.Assert( Formal.Data_Item = "*****", "out formal data bad" );
    Formal.Data_Item(1) := '!';
  end Check_Out_Tagged_Data;

end C641001_0;

------------------------------------------------------------------- C641001

with Report;
with TCTouch;
with C641001_0;
procedure C641001 is

  function II( I: Integer ) return Integer renames Report.Ident_Int;
        -- ^^ name chosen to allow embedding in calls

  A_String_10 : C641001_0.String_10;
  Slicable    : String(1..40);
  Tag_Slices  : C641001_0.Tag_List(0..11);

  Global_Data : String(1..26) := "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

  procedure Check_Out_Sliding( Lo1, Hi1, Lo2, Hi2 : Natural ) is

    subtype One_Constrained_String is String(Lo1..Hi1);   -- 1  5
    subtype Two_Constrained_String is String(Lo2..Hi2);   -- 6 10

    procedure Out_Param( Param : out One_Constrained_String ) is
    begin
      Param := Report.Ident_Str( Global_Data(Lo2..Hi2) );
    end Out_Param;
    Object : Two_Constrained_String;
  begin
    Out_Param( Object );
    if Object /= Report.Ident_Str( Global_Data(Lo2..Hi2) ) then
      Report.Failed("Bad result in Check_Out_Sliding");
    end if;
  exception
    when others => Report.Failed("Exception in Check_Out_Sliding");
  end Check_Out_Sliding;

  procedure Check_Dynamic_Subtype_Cases(F_Lower,F_Upper: Natural;
                                        A_Lower,A_Upper: Natural) is

    subtype Dyn_String is String(F_Lower..F_Upper);

    procedure Check_Dyn_Subtype_Formal_Out( Param : out Dyn_String ) is
    begin
      Param := Global_Data(11..20);
    end Check_Dyn_Subtype_Formal_Out;

    procedure Check_Dyn_Subtype_Formal_In( Param : in Dyn_String ) is
    begin
      if Param /= Global_Data(11..20) then
        Report.Failed("Dynamic case, data mismatch");
      end if;
    end Check_Dyn_Subtype_Formal_In;

    Stuff: String(A_Lower..A_Upper);

  begin
    Check_Dyn_Subtype_Formal_Out( Stuff );
    Check_Dyn_Subtype_Formal_In( Stuff );
  end Check_Dynamic_Subtype_Cases;

begin  -- Main test procedure.

  Report.Test ("C641001", "Check that actual parameters passed by " &
                          "reference are view converted to the nominal " &
                          "subtype of the formal parameter" );

  -- non error cases for string slices

  C641001_0.Check_String_10( A_String_10, 1, 10 );
  TCTouch.Assert( A_String_10 = "1234567890", "Nominal case" );

  C641001_0.Check_String_10( A_String_10, 11, 20 );
  TCTouch.Assert( A_String_10 = "ABCDEFGHIJ", "Sliding to subtype" );

  C641001_0.Check_String_10( Slicable(1..10), 1, 10 );
  TCTouch.Assert( Slicable(1..10) = "1234567890", "Slice, no sliding" );

  C641001_0.Check_String_10( Slicable(1..10), 21, 30 );
  TCTouch.Assert( Slicable(1..10) = "KLMNOPQRST", "Sliding to slice" );

  C641001_0.Check_String_10( Slicable(11..20), 11, 20 );
  TCTouch.Assert( Slicable(11..20) = "ABCDEFGHIJ", "Sliding to same" );

  C641001_0.Check_String_10( Slicable(21..30), 11, 20 );
  TCTouch.Assert( Slicable(21..30) = "ABCDEFGHIJ", "Sliding up" );

  -- error cases for string slices

  C641001_0.Check_Illegal_Slice_Reference( Slicable(21..30), 20 );

  C641001_0.Check_Illegal_Slice_Reference( Slicable(1..15), Slicable'Last );

  -- checks for view converting actuals to formals

  -- catch low bound fault
  C641001_0.Check_Tag_Slice( Tag_Slices(II(0)..9) );     -- II ::= Ident_Int
  TCTouch.Assert( Tag_Slices'First = 0, "Tag_Slices'First = 0" );
  TCTouch.Assert( Tag_Slices'Last = 11, "Tag_Slices'Last = 11" );

  -- catch high bound fault
  C641001_0.Check_Tag_Slice( Tag_Slices(2..II(11)) );
  TCTouch.Assert( Tag_Slices'First = 0, "Tag_Slices'First = 0" );
  TCTouch.Assert( Tag_Slices'Last = 11, "Tag_Slices'Last = 11" );

  Check_Formal_Association_Check:
  begin
    C641001_0.Check_String_10( Slicable, 1, 10 ); -- catch length fault
    Report.Failed("Exception not raised at Check_Formal_Association_Check");
  exception
    when Constraint_Error =>
      null; -- expected case
    when others =>
      Report.Failed("Wrong exception at Check_Formal_Association_Check");
  end Check_Formal_Association_Check;

  -- check for constrained actual, unconstrained formal
  C641001_0.Check_Out_Tagged_Data( Tag_Slices(5) );
  TCTouch.Assert( Tag_Slices(5).Data_Item = "!****",
                  "formal out returned bad result" );

  -- additional checks for out mode formal parameters, dynamic subtypes

  Check_Out_Sliding( II(1),II(5), II(6),II(10) );

  Check_Out_Sliding( 21,25, 6,10 );

  Check_Dynamic_Subtype_Cases(F_Lower => II(1), F_Upper => II(10),
                              A_Lower => II(1), A_Upper => II(10));

  Check_Dynamic_Subtype_Cases(F_Lower => II(21), F_Upper => II(30),
                              A_Lower => II( 1), A_Upper => II(10));

  Check_Dynamic_Subtype_Cases(F_Lower => II( 1), F_Upper => II(10),
                              A_Lower => II(21), A_Upper => II(30));

  Report.Result;

end C641001;