[Ada] AI12-0385 Predefined shifts and rotates should be static

gcc/ada/

	* Makefile.rtl: Add target pair for interfac.ads.
	* libgnat/interfac.ads: Add a comment.
	* libgnat/interfac__2020.ads: New, used for bootstrap purposes.
	* sem_util.adb (Is_Static_Function): Always return False for pre
	Ada 2020 to e.g. ignore the Static aspect in Interfaces for
	Ada < 2020.

2 files changed, 200 insertions, 0 deletions

diff --git a/gcc/ada/libgnat/interfac.ads b/gcc/ada/libgnat/interfac.ads
index 9fe7aac..9e7dfba 100644
--- a/gcc/ada/libgnat/interfac.ads
+++ b/gcc/ada/libgnat/interfac.ads
@@ -33,6 +33,8 @@
 --                                                                          --
 ------------------------------------------------------------------------------
 
+--  This is the compiler version of this unit
+
 pragma Compiler_Unit_Warning;
 
 package Interfaces is
diff --git a/gcc/ada/libgnat/interfac__2020.ads b/gcc/ada/libgnat/interfac__2020.ads
new file mode 100644
index 0000000..3f85599
--- /dev/null
+++ b/gcc/ada/libgnat/interfac__2020.ads
@@ -0,0 +1,198 @@
+------------------------------------------------------------------------------
+--                                                                          --
+--                         GNAT COMPILER COMPONENTS                         --
+--                                                                          --
+--                           I N T E R F A C E S                            --
+--                                                                          --
+--                                 S p e c                                  --
+--                                                                          --
+--          Copyright (C) 2002-2020, Free Software Foundation, Inc.         --
+--                                                                          --
+-- This specification is derived from the Ada Reference Manual for use with --
+-- GNAT. The copyright notice above, and the license provisions that follow --
+-- apply solely to the implementation dependent sections of this file.      --
+--                                                                          --
+-- 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.                                     --
+--                                                                          --
+-- As a special exception under Section 7 of GPL version 3, you are granted --
+-- additional permissions described in the GCC Runtime Library Exception,   --
+-- version 3.1, as published by the Free Software Foundation.               --
+--                                                                          --
+-- You should have received a copy of the GNU General Public License and    --
+-- a copy of the GCC Runtime Library Exception along with this program;     --
+-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
+-- <http://www.gnu.org/licenses/>.                                          --
+--                                                                          --
+-- GNAT was originally developed  by the GNAT team at  New York University. --
+-- Extensive contributions were provided by Ada Core Technologies Inc.      --
+--                                                                          --
+------------------------------------------------------------------------------
+
+--  This is the runtime version of this unit (not used during GNAT build)
+
+package Interfaces is
+   pragma No_Elaboration_Code_All;
+   pragma Pure;
+
+   --  All identifiers in this unit are implementation defined
+
+   pragma Implementation_Defined;
+
+   type Integer_8  is range -2 **  7 .. 2 **  7 - 1;
+   for Integer_8'Size use  8;
+
+   type Integer_16 is range -2 ** 15 .. 2 ** 15 - 1;
+   for Integer_16'Size use 16;
+
+   type Integer_32 is range -2 ** 31 .. 2 ** 31 - 1;
+   for Integer_32'Size use 32;
+
+   type Integer_64 is new Long_Long_Integer;
+   for Integer_64'Size use 64;
+   --  Note: we use Long_Long_Integer'First instead of -2 ** 63 to allow this
+   --  unit to compile when using custom target configuration files where the
+   --  maximum integer is 32 bits. This is useful for static analysis tools
+   --  such as SPARK or CodePeer. In the normal case Long_Long_Integer is
+   --  always 64-bits so we get the desired 64-bit type.
+
+   type Unsigned_8  is mod 2 ** 8;
+   for Unsigned_8'Size use  8;
+
+   type Unsigned_16 is mod 2 ** 16;
+   for Unsigned_16'Size use 16;
+
+   type Unsigned_24 is mod 2 ** 24;
+   for Unsigned_24'Size use 24;
+   --  Declare this type for compatibility with legacy Ada compilers.
+   --  This is particularly useful in the context of CodePeer analysis.
+
+   type Unsigned_32 is mod 2 ** 32;
+   for Unsigned_32'Size use 32;
+
+   type Unsigned_64 is mod 2 ** Long_Long_Integer'Size;
+   for Unsigned_64'Size use 64;
+   --  See comment on Integer_64 above
+
+   function Shift_Left
+     (Value  : Unsigned_8;
+      Amount : Natural) return Unsigned_8
+      with Import, Convention => Intrinsic, Static;
+
+   function Shift_Right
+     (Value  : Unsigned_8;
+      Amount : Natural) return Unsigned_8
+      with Import, Convention => Intrinsic, Static;
+
+   function Shift_Right_Arithmetic
+     (Value  : Unsigned_8;
+      Amount : Natural) return Unsigned_8
+      with Import, Convention => Intrinsic, Static;
+
+   function Rotate_Left
+     (Value  : Unsigned_8;
+      Amount : Natural) return Unsigned_8
+      with Import, Convention => Intrinsic, Static;
+
+   function Rotate_Right
+     (Value  : Unsigned_8;
+      Amount : Natural) return Unsigned_8
+      with Import, Convention => Intrinsic, Static;
+
+   function Shift_Left
+     (Value  : Unsigned_16;
+      Amount : Natural) return Unsigned_16
+      with Import, Convention => Intrinsic, Static;
+
+   function Shift_Right
+     (Value  : Unsigned_16;
+      Amount : Natural) return Unsigned_16
+      with Import, Convention => Intrinsic, Static;
+
+   function Shift_Right_Arithmetic
+     (Value  : Unsigned_16;
+      Amount : Natural) return Unsigned_16
+      with Import, Convention => Intrinsic, Static;
+
+   function Rotate_Left
+     (Value  : Unsigned_16;
+      Amount : Natural) return Unsigned_16
+      with Import, Convention => Intrinsic, Static;
+
+   function Rotate_Right
+     (Value  : Unsigned_16;
+      Amount : Natural) return Unsigned_16
+      with Import, Convention => Intrinsic, Static;
+
+   function Shift_Left
+     (Value  : Unsigned_32;
+      Amount : Natural) return Unsigned_32
+      with Import, Convention => Intrinsic, Static;
+
+   function Shift_Right
+     (Value  : Unsigned_32;
+      Amount : Natural) return Unsigned_32
+      with Import, Convention => Intrinsic, Static;
+
+   function Shift_Right_Arithmetic
+     (Value  : Unsigned_32;
+      Amount : Natural) return Unsigned_32
+      with Import, Convention => Intrinsic, Static;
+
+   function Rotate_Left
+     (Value  : Unsigned_32;
+      Amount : Natural) return Unsigned_32
+      with Import, Convention => Intrinsic, Static;
+
+   function Rotate_Right
+     (Value  : Unsigned_32;
+      Amount : Natural) return Unsigned_32
+      with Import, Convention => Intrinsic, Static;
+
+   function Shift_Left
+     (Value  : Unsigned_64;
+      Amount : Natural) return Unsigned_64
+      with Import, Convention => Intrinsic, Static;
+
+   function Shift_Right
+     (Value  : Unsigned_64;
+      Amount : Natural) return Unsigned_64
+      with Import, Convention => Intrinsic, Static;
+
+   function Shift_Right_Arithmetic
+     (Value  : Unsigned_64;
+      Amount : Natural) return Unsigned_64
+      with Import, Convention => Intrinsic, Static;
+
+   function Rotate_Left
+     (Value  : Unsigned_64;
+      Amount : Natural) return Unsigned_64
+      with Import, Convention => Intrinsic, Static;
+
+   function Rotate_Right
+     (Value  : Unsigned_64;
+      Amount : Natural) return Unsigned_64
+      with Import, Convention => Intrinsic, Static;
+
+   --  IEEE Floating point types
+
+   type IEEE_Float_32 is digits 6;
+   for IEEE_Float_32'Size use 32;
+
+   type IEEE_Float_64 is digits 15;
+   for IEEE_Float_64'Size use 64;
+
+   --  If there is an IEEE extended float available on the machine, we assume
+   --  that it is available as Long_Long_Float.
+
+   --  Note: it is harmless, and explicitly permitted, to include additional
+   --  types in interfaces, so it is not wrong to have IEEE_Extended_Float
+   --  defined even if the extended format is not available.
+
+   type IEEE_Extended_Float is new Long_Long_Float;
+
+end Interfaces;