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-- CD30002.A

--

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--     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 the implementation supports Alignments for subtypes and

--      objects specified as factors and multiples of the number of storage

--      elements per word, unless those values cannot be loaded and stored.

--      Check that the largest alignment returned by default is supported.

--

--      Check that the implementation supports Alignments supported by the

--      target linker for stand-alone library-level objects of statically

--      constrained subtypes.

--

-- TEST DESCRIPTION:

--      This test defines several types and objects, specifying various

--      alignments for them (as factors and multiples of the number of

--      storage elements per word).  It then checks the alignments by

--      declaring some objects, and checking that the integer values of

--      their addresses is mod the specified alignment.  This will not

--      prevent false passes where the lucky compiler gets it right by

--      chance, but will catch compilers that specifically do not obey

--      the alignment clauses.

--

-- APPLICABILITY CRITERIA:

--      All implementations must attempt to compile this test.

--

--      For implementations validating against Systems Programming Annex (C):

--        this test must execute and report PASSED.

--

--      For implementations not validating against Annex C:

--        this test may report compile time errors at one or more points

--        indicated by "-- ANX-C RQMT", in which case it may be graded as inapplicable.

--        Otherwise, the test must execute and report PASSED.

--

--

-- CHANGE HISTORY:

--      22 JUL 95   SAIC   Initial version

--      09 MAY 96   SAIC   Strengthened for 2.1

--      26 FEB 97   PWB.CTA Allowed for unexpected word sizes

--      16 FEB 98   EDS    Modified documentation.

--      26 SEP 98   RLB    Fixed value on line 130 so check and dec. match.

--      30 OCT 98   RLB    Split Multiple_Alignment and revised the

--                         calculation to work on all targets.

--      18 JAN 99   RLB    Repaired again to work on targets where word size

--                         equals storage unit.

--!

----------------------------------------------------------------- CD30002_0

with Impdef;

with System.Storage_Elements;

package CD30002_0 is

  S_Units_per_Word : constant := System.Word_Size/System.Storage_Unit;

        -- Must be 1 or greater.

  Multiple_Type_Alignment : constant :=

      Integer'Min ( Impdef.Max_Default_Alignment,

                    2 * S_Units_per_Word );

      -- Calculate a reasonable alignment, but not larger than the

      -- implementation is required to support.

  Multiple_Object_Alignment : constant :=

      Integer'Min ( Impdef.Max_Linker_Alignment,

                    2 * S_Units_per_Word );

      -- Calculate a reasonable object alignment, but not larger than

      -- the implementation is required to support.

  Small_Alignment : constant :=

      Integer'Max ( S_Units_per_Word / 2, 1);

      -- Calculate a reasonable small alignment, but not less than 1.

      -- (If S_Units_per_Word = 1, 1/2 => 0 which causes problems

      -- verifying alignment.)

  subtype Storage_Element is System.Storage_Elements.Storage_Element;

  type Some_Stuff is array(1..S_Units_Per_Word) of Storage_Element;

    for Some_Stuff'Alignment

      use Impdef.Max_Default_Alignment;                       -- ANX-C RQMT.

  Library_Level_Object : Some_Stuff;

    for Library_Level_Object'Alignment

      use Impdef.Max_Linker_Alignment;                        -- ANX-C RQMT.

  type Quarter is mod 4; -- two bits

    for Quarter'Alignment use Small_Alignment;                -- ANX-C RQMT.

  type Half is mod 16; -- nibble

    for Half'Alignment use Multiple_Type_Alignment;                -- ANX-C RQMT.

  type O_Some_Stuff is array(1..S_Units_Per_Word) of Storage_Element;

  type O_Quarter is mod 4; -- two bits

  type O_Half is mod 16; -- nibble

end CD30002_0;

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

-- there is no package body CD30002_0

------------------------------------------------------------------- CD30002

with Report;

with Impdef;

with CD30002_0;

with System.Storage_Elements;

procedure CD30002 is

  My_Stuff   : CD30002_0.Some_Stuff;

    -- Impdef.Max_Default_Alignment

  My_Quarter : CD30002_0.Quarter;

    -- CD30002_0.S_Units_per_Word / 2

  My_Half    : CD30002_0.Half;

    -- CD30002_0.S_Units_per_Word * 2

  Stuff_Object   : CD30002_0.O_Some_Stuff;

    for Stuff_Object'Alignment

      use Impdef.Max_Default_Alignment;                       -- ANX-C RQMT.

  Quarter_Object : CD30002_0.O_Quarter;

    for Quarter_Object'Alignment

        use CD30002_0.Small_Alignment;                        -- ANX-C RQMT.

  Half_Object    : CD30002_0.O_Half;

    for Half_Object'Alignment

        use CD30002_0.Multiple_Object_Alignment;              -- ANX-C RQMT.

  subtype IntAdd is System.Storage_Elements.Integer_Address;

    use type System.Storage_Elements.Integer_Address;

  function A2I(Value: System.Address) return IntAdd renames

    System.Storage_Elements.To_Integer;

  NAC : constant String := " not aligned correctly";

begin  -- Main test procedure.

  Report.Test ("CD30002", "Check that the implementation supports " &

                          "Alignments for subtypes and objects specified " &

                          "as factors and multiples of the number of " &

                          "storage elements per word, unless those values " &

                          "cannot be loaded and stored. Check that the " &

                          "largest alignment returned by default is " &

                          "supported. Check that the implementation " &

                          "supports Alignments supported by the target " &

                          "linker for stand-alone library-level objects " &

                          "of statically constrained subtypes" );

  if A2I(CD30002_0.Library_Level_Object'Address)

     mod Impdef.Max_Linker_Alignment /= 0 then

    Report.Failed("Library_Level_Object" & NAC);

  end if;

  if A2I(My_Stuff'Address) mod Impdef.Max_Default_Alignment /= 0 then

    Report.Failed("Max alignment subtype" & NAC);

  end if;

  if A2I(My_Quarter'Address) mod (CD30002_0.Small_Alignment) /= 0 then

    Report.Failed("Factor of words subtype" & NAC);

  end if;

  if A2I(My_Half'Address) mod (CD30002_0.Multiple_Type_Alignment) /= 0 then

    Report.Failed("Multiple of words subtype" & NAC);

  end if;

  if A2I(Stuff_Object'Address) mod Impdef.Max_Default_Alignment /= 0 then

    Report.Failed("Stuff alignment object" & NAC);

  end if;

  if A2I(Quarter_Object'Address)

       mod (CD30002_0.Small_Alignment) /= 0 then

    Report.Failed("Factor of words object" & NAC);

  end if;

  if A2I(Half_Object'Address) mod (CD30002_0.Multiple_Object_Alignment) /= 0 then

    Report.Failed("Multiple of words object" & NAC);

  end if;

  Report.Result;

end CD30002;