[Ada] Add Ada 2022 features to sets containers

This patch adds some Ada 2022 features to the set children of
Ada.Containers.

gcc/ada/

	* libgnat/a-cbhase.adb, libgnat/a-cbhase.ads,
	libgnat/a-cborse.adb, libgnat/a-cborse.ads,
	libgnat/a-cihase.adb, libgnat/a-cihase.ads,
	libgnat/a-ciorse.adb, libgnat/a-ciorse.ads,
	libgnat/a-cohase.adb, libgnat/a-cohase.ads,
	libgnat/a-conhel.adb, libgnat/a-conhel.ads,
	libgnat/a-coorse.adb, libgnat/a-coorse.ads: Add Has_Element,
	Element, Query_Element, and Next subprograms that take a Set
	parameter. Add Tampering_With_Cursors_Prohibited function. These
	are all new in Ada 2022.

14 files changed, 482 insertions, 8 deletions

diff --git a/gcc/ada/libgnat/a-cbhase.adb b/gcc/ada/libgnat/a-cbhase.adb
index 9076d8e..b83ab80 100644
--- a/gcc/ada/libgnat/a-cbhase.adb
+++ b/gcc/ada/libgnat/a-cbhase.adb
@@ -1599,6 +1599,64 @@ is
       raise Program_Error with "attempt to stream reference";
    end Write;
 
+   --  Ada 2022 features:
+
+   function Has_Element (Container : Set; Position : Cursor) return Boolean is
+   begin
+      pragma Assert (Vet (Position), "bad cursor in Has_Element");
+      pragma Assert ((Position.Container = null) = (Position.Node = 0),
+                     "bad nullity in Has_Element");
+      return Position.Container = Container'Unrestricted_Access;
+   end Has_Element;
+
+   function Tampering_With_Cursors_Prohibited
+     (Container : Set) return Boolean
+   is
+   begin
+      return Is_Busy (Container.TC);
+   end Tampering_With_Cursors_Prohibited;
+
+   function Element (Container : Set; Position : Cursor) return Element_Type is
+   begin
+      if Checks and then not Has_Element (Container, Position) then
+         raise Program_Error with "Position for wrong Container";
+      end if;
+
+      return Element (Position);
+   end Element;
+
+   procedure Query_Element
+     (Container : Set;
+      Position  : Cursor;
+      Process   : not null access procedure (Element : Element_Type)) is
+   begin
+      if Checks and then not Has_Element (Container, Position) then
+         raise Program_Error with "Position for wrong Container";
+      end if;
+
+      Query_Element (Position, Process);
+   end Query_Element;
+
+   function Next (Container : Set; Position : Cursor) return Cursor is
+   begin
+      if Checks and then
+        not (Position = No_Element or else Has_Element (Container, Position))
+      then
+         raise Program_Error with "Position for wrong Container";
+      end if;
+
+      return Next (Position);
+   end Next;
+
+   procedure Next (Container : Set; Position : in out Cursor) is
+   begin
+      Position := Next (Container, Position);
+   end Next;
+
+   ------------------
+   -- Generic_Keys --
+   ------------------
+
    package body Generic_Keys is
 
       -----------------------
diff --git a/gcc/ada/libgnat/a-cbhase.ads b/gcc/ada/libgnat/a-cbhase.ads
index c30a364..7079c51 100644
--- a/gcc/ada/libgnat/a-cbhase.ads
+++ b/gcc/ada/libgnat/a-cbhase.ads
@@ -369,6 +369,25 @@ is
      (Container : Set)
       return Set_Iterator_Interfaces.Forward_Iterator'Class;
 
+   --  Ada 2022 features:
+
+   function Has_Element (Container : Set; Position : Cursor) return Boolean;
+
+   function Tampering_With_Cursors_Prohibited (Container : Set) return Boolean;
+
+   function Element (Container : Set; Position : Cursor) return Element_Type;
+
+   procedure Query_Element
+     (Container : Set;
+      Position  : Cursor;
+      Process   : not null access procedure (Element : Element_Type));
+
+   function Next (Container : Set; Position : Cursor) return Cursor;
+
+   procedure Next (Container : Set; Position : in out Cursor);
+
+   ----------------
+
    generic
       type Key_Type (<>) is private;
 
diff --git a/gcc/ada/libgnat/a-cborse.adb b/gcc/ada/libgnat/a-cborse.adb
index 55eca40..bc52b45 100644
--- a/gcc/ada/libgnat/a-cborse.adb
+++ b/gcc/ada/libgnat/a-cborse.adb
@@ -688,6 +688,62 @@ is
               else Cursor'(Container'Unrestricted_Access, Node));
    end Floor;
 
+   --  Ada 2022 features:
+
+   function Has_Element (Container : Set; Position : Cursor) return Boolean is
+   begin
+      pragma Assert
+        (Position.Container = null or else Vet (Container, Position.Node),
+         "bad cursor in Has_Element");
+      pragma Assert ((Position.Container = null) = (Position.Node = 0),
+                     "bad nullity in Has_Element");
+      return Position.Container = Container'Unrestricted_Access;
+   end Has_Element;
+
+   function Tampering_With_Cursors_Prohibited
+     (Container : Set) return Boolean
+   is
+   begin
+      return Is_Busy (Container.TC);
+   end Tampering_With_Cursors_Prohibited;
+
+   function Element (Container : Set; Position : Cursor) return Element_Type is
+   begin
+      if Checks and then not Has_Element (Container, Position) then
+         raise Program_Error with "Position for wrong Container";
+      end if;
+
+      return Element (Position);
+   end Element;
+
+   procedure Query_Element
+     (Container : Set;
+      Position  : Cursor;
+      Process   : not null access procedure (Element : Element_Type)) is
+   begin
+      if Checks and then not Has_Element (Container, Position) then
+         raise Program_Error with "Position for wrong Container";
+      end if;
+
+      Query_Element (Position, Process);
+   end Query_Element;
+
+   function Next (Container : Set; Position : Cursor) return Cursor is
+   begin
+      if Checks and then
+        not (Position = No_Element or else Has_Element (Container, Position))
+      then
+         raise Program_Error with "Position for wrong Container";
+      end if;
+
+      return Next (Position);
+   end Next;
+
+   procedure Next (Container : Set; Position : in out Cursor) is
+   begin
+      Position := Next (Container, Position);
+   end Next;
+
    ------------------
    -- Generic_Keys --
    ------------------
diff --git a/gcc/ada/libgnat/a-cborse.ads b/gcc/ada/libgnat/a-cborse.ads
index ceaf885..be22c25 100644
--- a/gcc/ada/libgnat/a-cborse.ads
+++ b/gcc/ada/libgnat/a-cborse.ads
@@ -230,6 +230,25 @@ is
       Start     : Cursor)
       return Set_Iterator_Interfaces.Reversible_Iterator'class;
 
+   --  Ada 2022 features:
+
+   function Has_Element (Container : Set; Position : Cursor) return Boolean;
+
+   function Tampering_With_Cursors_Prohibited (Container : Set) return Boolean;
+
+   function Element (Container : Set; Position : Cursor) return Element_Type;
+
+   procedure Query_Element
+     (Container : Set;
+      Position  : Cursor;
+      Process   : not null access procedure (Element : Element_Type));
+
+   function Next (Container : Set; Position : Cursor) return Cursor;
+
+   procedure Next (Container : Set; Position : in out Cursor);
+
+   ----------------
+
    generic
       type Key_Type (<>) is private;
 
diff --git a/gcc/ada/libgnat/a-cihase.adb b/gcc/ada/libgnat/a-cihase.adb
index 090d01c..0a9aabd 100644
--- a/gcc/ada/libgnat/a-cihase.adb
+++ b/gcc/ada/libgnat/a-cihase.adb
@@ -2031,6 +2031,64 @@ is
       Element_Type'Output (Stream, Node.Element.all);
    end Write_Node;
 
+   --  Ada 2022 features:
+
+   function Has_Element (Container : Set; Position : Cursor) return Boolean is
+   begin
+      pragma Assert (Vet (Position), "bad cursor in Has_Element");
+      pragma Assert ((Position.Container = null) = (Position.Node = null),
+                     "bad nullity in Has_Element");
+      return Position.Container = Container'Unrestricted_Access;
+   end Has_Element;
+
+   function Tampering_With_Cursors_Prohibited
+     (Container : Set) return Boolean
+   is
+   begin
+      return Is_Busy (Container.HT.TC);
+   end Tampering_With_Cursors_Prohibited;
+
+   function Element (Container : Set; Position : Cursor) return Element_Type is
+   begin
+      if Checks and then not Has_Element (Container, Position) then
+         raise Program_Error with "Position for wrong Container";
+      end if;
+
+      return Element (Position);
+   end Element;
+
+   procedure Query_Element
+     (Container : Set;
+      Position  : Cursor;
+      Process   : not null access procedure (Element : Element_Type)) is
+   begin
+      if Checks and then not Has_Element (Container, Position) then
+         raise Program_Error with "Position for wrong Container";
+      end if;
+
+      Query_Element (Position, Process);
+   end Query_Element;
+
+   function Next (Container : Set; Position : Cursor) return Cursor is
+   begin
+      if Checks and then
+        not (Position = No_Element or else Has_Element (Container, Position))
+      then
+         raise Program_Error with "Position for wrong Container";
+      end if;
+
+      return Next (Position);
+   end Next;
+
+   procedure Next (Container : Set; Position : in out Cursor) is
+   begin
+      Position := Next (Container, Position);
+   end Next;
+
+   ------------------
+   -- Generic_Keys --
+   ------------------
+
    package body Generic_Keys is
 
       -----------------------
diff --git a/gcc/ada/libgnat/a-cihase.ads b/gcc/ada/libgnat/a-cihase.ads
index cff713d..dcd1d6a 100644
--- a/gcc/ada/libgnat/a-cihase.ads
+++ b/gcc/ada/libgnat/a-cihase.ads
@@ -355,6 +355,25 @@ is
    function Iterate (Container : Set)
      return Set_Iterator_Interfaces.Forward_Iterator'Class;
 
+   --  Ada 2022 features:
+
+   function Has_Element (Container : Set; Position : Cursor) return Boolean;
+
+   function Tampering_With_Cursors_Prohibited (Container : Set) return Boolean;
+
+   function Element (Container : Set; Position : Cursor) return Element_Type;
+
+   procedure Query_Element
+     (Container : Set;
+      Position  : Cursor;
+      Process   : not null access procedure (Element : Element_Type));
+
+   function Next (Container : Set; Position : Cursor) return Cursor;
+
+   procedure Next (Container : Set; Position : in out Cursor);
+
+   ----------------
+
    generic
       type Key_Type (<>) is private;
 
diff --git a/gcc/ada/libgnat/a-ciorse.adb b/gcc/ada/libgnat/a-ciorse.adb
index b23b252..d5502ea 100644
--- a/gcc/ada/libgnat/a-ciorse.adb
+++ b/gcc/ada/libgnat/a-ciorse.adb
@@ -721,6 +721,61 @@ is
       Deallocate (X);
    end Free;
 
+   --  Ada 2022 features:
+
+   function Has_Element (Container : Set; Position : Cursor) return Boolean is
+   begin
+      pragma Assert
+        (Vet (Container.Tree, Position.Node), "bad cursor in Has_Element");
+      pragma Assert ((Position.Container = null) = (Position.Node = null),
+                     "bad nullity in Has_Element");
+      return Position.Container = Container'Unrestricted_Access;
+   end Has_Element;
+
+   function Tampering_With_Cursors_Prohibited
+     (Container : Set) return Boolean
+   is
+   begin
+      return Is_Busy (Container.Tree.TC);
+   end Tampering_With_Cursors_Prohibited;
+
+   function Element (Container : Set; Position : Cursor) return Element_Type is
+   begin
+      if Checks and then not Has_Element (Container, Position) then
+         raise Program_Error with "Position for wrong Container";
+      end if;
+
+      return Element (Position);
+   end Element;
+
+   procedure Query_Element
+     (Container : Set;
+      Position  : Cursor;
+      Process   : not null access procedure (Element : Element_Type)) is
+   begin
+      if Checks and then not Has_Element (Container, Position) then
+         raise Program_Error with "Position for wrong Container";
+      end if;
+
+      Query_Element (Position, Process);
+   end Query_Element;
+
+   function Next (Container : Set; Position : Cursor) return Cursor is
+   begin
+      if Checks and then
+        not (Position = No_Element or else Has_Element (Container, Position))
+      then
+         raise Program_Error with "Position for wrong Container";
+      end if;
+
+      return Next (Position);
+   end Next;
+
+   procedure Next (Container : Set; Position : in out Cursor) is
+   begin
+      Position := Next (Container, Position);
+   end Next;
+
    ------------------
    -- Generic_Keys --
    ------------------
diff --git a/gcc/ada/libgnat/a-ciorse.ads b/gcc/ada/libgnat/a-ciorse.ads
index 13272e2..d053ac7 100644
--- a/gcc/ada/libgnat/a-ciorse.ads
+++ b/gcc/ada/libgnat/a-ciorse.ads
@@ -238,6 +238,25 @@ is
       Start     : Cursor)
       return Set_Iterator_Interfaces.Reversible_Iterator'class;
 
+   --  Ada 2022 features:
+
+   function Has_Element (Container : Set; Position : Cursor) return Boolean;
+
+   function Tampering_With_Cursors_Prohibited (Container : Set) return Boolean;
+
+   function Element (Container : Set; Position : Cursor) return Element_Type;
+
+   procedure Query_Element
+     (Container : Set;
+      Position  : Cursor;
+      Process   : not null access procedure (Element : Element_Type));
+
+   function Next (Container : Set; Position : Cursor) return Cursor;
+
+   procedure Next (Container : Set; Position : in out Cursor);
+
+   ----------------
+
    generic
       type Key_Type (<>) is private;
 
diff --git a/gcc/ada/libgnat/a-cohase.adb b/gcc/ada/libgnat/a-cohase.adb
index 986b354..4656868 100644
--- a/gcc/ada/libgnat/a-cohase.adb
+++ b/gcc/ada/libgnat/a-cohase.adb
@@ -1844,6 +1844,64 @@ is
       Element_Type'Write (Stream, Node.Element);
    end Write_Node;
 
+   --  Ada 2022 features:
+
+   function Has_Element (Container : Set; Position : Cursor) return Boolean is
+   begin
+      pragma Assert (Vet (Position), "bad cursor in Has_Element");
+      pragma Assert ((Position.Container = null) = (Position.Node = null),
+                     "bad nullity in Has_Element");
+      return Position.Container = Container'Unrestricted_Access;
+   end Has_Element;
+
+   function Tampering_With_Cursors_Prohibited
+     (Container : Set) return Boolean
+   is
+   begin
+      return Is_Busy (Container.HT.TC);
+   end Tampering_With_Cursors_Prohibited;
+
+   function Element (Container : Set; Position : Cursor) return Element_Type is
+   begin
+      if Checks and then not Has_Element (Container, Position) then
+         raise Program_Error with "Position for wrong Container";
+      end if;
+
+      return Element (Position);
+   end Element;
+
+   procedure Query_Element
+     (Container : Set;
+      Position  : Cursor;
+      Process   : not null access procedure (Element : Element_Type)) is
+   begin
+      if Checks and then not Has_Element (Container, Position) then
+         raise Program_Error with "Position for wrong Container";
+      end if;
+
+      Query_Element (Position, Process);
+   end Query_Element;
+
+   function Next (Container : Set; Position : Cursor) return Cursor is
+   begin
+      if Checks and then
+        not (Position = No_Element or else Has_Element (Container, Position))
+      then
+         raise Program_Error with "Position for wrong Container";
+      end if;
+
+      return Next (Position);
+   end Next;
+
+   procedure Next (Container : Set; Position : in out Cursor) is
+   begin
+      Position := Next (Container, Position);
+   end Next;
+
+   ------------------
+   -- Generic_Keys --
+   ------------------
+
    package body Generic_Keys is
 
       -----------------------
diff --git a/gcc/ada/libgnat/a-cohase.ads b/gcc/ada/libgnat/a-cohase.ads
index ada212c..9f562d8 100644
--- a/gcc/ada/libgnat/a-cohase.ads
+++ b/gcc/ada/libgnat/a-cohase.ads
@@ -367,6 +367,25 @@ is
    function Iterate
      (Container : Set) return Set_Iterator_Interfaces.Forward_Iterator'Class;
 
+   --  Ada 2022 features:
+
+   function Has_Element (Container : Set; Position : Cursor) return Boolean;
+
+   function Tampering_With_Cursors_Prohibited (Container : Set) return Boolean;
+
+   function Element (Container : Set; Position : Cursor) return Element_Type;
+
+   procedure Query_Element
+     (Container : Set;
+      Position  : Cursor;
+      Process   : not null access procedure (Element : Element_Type));
+
+   function Next (Container : Set; Position : Cursor) return Cursor;
+
+   procedure Next (Container : Set; Position : in out Cursor);
+
+   ----------------
+
    generic
       type Key_Type (<>) is private;
 
diff --git a/gcc/ada/libgnat/a-conhel.adb b/gcc/ada/libgnat/a-conhel.adb
index b24be67..46f1bcc 100644
--- a/gcc/ada/libgnat/a-conhel.adb
+++ b/gcc/ada/libgnat/a-conhel.adb
@@ -36,8 +36,6 @@ package body Ada.Containers.Helpers is
 
    package body Generic_Implementation is
 
-      use type SAC.Atomic_Unsigned;
-
       ------------
       -- Adjust --
       ------------
@@ -133,7 +131,7 @@ package body Ada.Containers.Helpers is
       procedure TC_Check (T_Counts : Tamper_Counts) is
       begin
          if T_Check then
-            if T_Counts.Busy > 0 then
+            if Is_Busy (T_Counts) then
                raise Program_Error with
                  "attempt to tamper with cursors";
             end if;
@@ -144,7 +142,7 @@ package body Ada.Containers.Helpers is
             --  Thus if the busy count is zero, then the lock count
             --  must also be zero.
 
-            pragma Assert (T_Counts.Lock = 0);
+            pragma Assert (not Is_Locked (T_Counts));
          end if;
       end TC_Check;
 
@@ -154,7 +152,7 @@ package body Ada.Containers.Helpers is
 
       procedure TE_Check (T_Counts : Tamper_Counts) is
       begin
-         if T_Check and then T_Counts.Lock > 0 then
+         if T_Check and then Is_Locked (T_Counts) then
             raise Program_Error with
               "attempt to tamper with elements";
          end if;
diff --git a/gcc/ada/libgnat/a-conhel.ads b/gcc/ada/libgnat/a-conhel.ads
index 47811f5..92e23d0 100644
--- a/gcc/ada/libgnat/a-conhel.ads
+++ b/gcc/ada/libgnat/a-conhel.ads
@@ -121,9 +121,31 @@ package Ada.Containers.Helpers is
       pragma Inline (TE_Check);
       --  Tampering-with-elements check
 
-      -----------------
-      --  RAII Types --
-      -----------------
+      ---------------------------------------
+      -- Queries of busy and locked status --
+      ---------------------------------------
+
+      --  These are never called when tampering checks are suppressed.
+
+      use type SAC.Atomic_Unsigned;
+
+      pragma Warnings (Off);
+      --  Otherwise, the -gnatw.n switch triggers unwanted warnings on the
+      --  references to atomic variables below.
+
+      function Is_Busy (T_Counts : Tamper_Counts) return Boolean is
+        (if T_Check then T_Counts.Busy > 0 else raise Program_Error);
+      pragma Inline (Is_Busy);
+
+      function Is_Locked (T_Counts : Tamper_Counts) return Boolean is
+        (if T_Check then T_Counts.Lock > 0 else raise Program_Error);
+      pragma Inline (Is_Locked);
+
+      pragma Warnings (On);
+
+      ----------------
+      -- RAII Types --
+      ----------------
 
       --  Initialize of With_Busy increments the Busy count, and Finalize
       --  decrements it. Thus, to prohibit tampering with elements within a
diff --git a/gcc/ada/libgnat/a-coorse.adb b/gcc/ada/libgnat/a-coorse.adb
index 7998ee8..848022e 100644
--- a/gcc/ada/libgnat/a-coorse.adb
+++ b/gcc/ada/libgnat/a-coorse.adb
@@ -643,6 +643,61 @@ is
       end if;
    end Free;
 
+   --  Ada 2022 features:
+
+   function Has_Element (Container : Set; Position : Cursor) return Boolean is
+   begin
+      pragma Assert
+        (Vet (Container.Tree, Position.Node), "bad cursor in Has_Element");
+      pragma Assert ((Position.Container = null) = (Position.Node = null),
+                     "bad nullity in Has_Element");
+      return Position.Container = Container'Unrestricted_Access;
+   end Has_Element;
+
+   function Tampering_With_Cursors_Prohibited
+     (Container : Set) return Boolean
+   is
+   begin
+      return Is_Busy (Container.Tree.TC);
+   end Tampering_With_Cursors_Prohibited;
+
+   function Element (Container : Set; Position : Cursor) return Element_Type is
+   begin
+      if Checks and then not Has_Element (Container, Position) then
+         raise Program_Error with "Position for wrong Container";
+      end if;
+
+      return Element (Position);
+   end Element;
+
+   procedure Query_Element
+     (Container : Set;
+      Position  : Cursor;
+      Process   : not null access procedure (Element : Element_Type)) is
+   begin
+      if Checks and then not Has_Element (Container, Position) then
+         raise Program_Error with "Position for wrong Container";
+      end if;
+
+      Query_Element (Position, Process);
+   end Query_Element;
+
+   function Next (Container : Set; Position : Cursor) return Cursor is
+   begin
+      if Checks and then
+        not (Position = No_Element or else Has_Element (Container, Position))
+      then
+         raise Program_Error with "Position for wrong Container";
+      end if;
+
+      return Next (Position);
+   end Next;
+
+   procedure Next (Container : Set; Position : in out Cursor) is
+   begin
+      Position := Next (Container, Position);
+   end Next;
+
    ------------------
    -- Generic_Keys --
    ------------------
diff --git a/gcc/ada/libgnat/a-coorse.ads b/gcc/ada/libgnat/a-coorse.ads
index 1833336..9619599 100644
--- a/gcc/ada/libgnat/a-coorse.ads
+++ b/gcc/ada/libgnat/a-coorse.ads
@@ -231,6 +231,25 @@ is
       Start     : Cursor)
       return Set_Iterator_Interfaces.Reversible_Iterator'class;
 
+   --  Ada 2022 features:
+
+   function Has_Element (Container : Set; Position : Cursor) return Boolean;
+
+   function Tampering_With_Cursors_Prohibited (Container : Set) return Boolean;
+
+   function Element (Container : Set; Position : Cursor) return Element_Type;
+
+   procedure Query_Element
+     (Container : Set;
+      Position  : Cursor;
+      Process   : not null access procedure (Element : Element_Type));
+
+   function Next (Container : Set; Position : Cursor) return Cursor;
+
+   procedure Next (Container : Set; Position : in out Cursor);
+
+   ----------------
+
    generic
       type Key_Type (<>) is private;