cd30002.a

来自「linux下编程用 编译软件」· A 代码 · 共 208 行

-- CD30002.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 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;