a-crbtgo.ads: Commented each subprogram

2006-10-31  Matt Heaney  <heaney@adacore.com>

	* a-crbtgo.ads: Commented each subprogram

	* a-crbtgo.adb: Added reference to book from which algorithms were
	adapted.

        * a-crbtgk.ads, a-crbtgk.adb (Generic_Insert_Post): pass flag to
	indicate which child.
	(Generic_Conditional_Insert): changed parameter name from "Success" to
	"Inserted".
	(Generic_Unconditional_Insert_With_Hint): improved algorithm

	* a-coorse.adb (Replace_Element): changed parameter name in call to
	conditional insert operation.

	* a-convec.adb, a-coinve.adb (Insert): removed obsolete comment

	* a-cohama.adb (Iterate): manipulate busy-bit here, instead of in
	Generic_Iteration

	* a-ciorse.adb (Replace_Element): changed parameter name in call to
	conditional insert operation.

	* a-cihama.adb (Iterate): manipulate busy-bit here, instead of in
	Generic_Iteration.

	* a-cidlli.ads, a-cidlli.adb (Splice): Position param is now mode in
	instead of mode inout.

	* a-chtgop.adb (Adjust): modified comments to reflect current AI-302
	draft
	(Generic_Read): preserve existing buckets array if possible
	(Generic_Write): don't send buckets array length anymore

	* a-cdlili.ads, a-cdlili.adb (Splice): Position param is now mode in
	instead of mode inout.

	* a-cihase.adb (Difference): iterate over smaller of Tgt and Src sets
	(Iterate): manipulate busy-bit here, instead of in Generic_Iteration

	* a-cohase.adb (Difference): iterate over smaller of Tgt and Src sets
	(Iterate): manipulate busy-bit here, instead of in Generic_Iteration
	(Replace_Element): local operation is now an instantiation

	* a-chtgke.ads, a-chtgke.adb (Generic_Conditional_Insert): manually
	check current length.
	(Generic_Replace_Element): new operation

From-SVN: r118324

1 files changed, 62 insertions, 85 deletions

diff --git a/gcc/ada/a-coorse.adb b/gcc/ada/a-coorse.adb
index 5529873..d407fea 100644
--- a/gcc/ada/a-coorse.adb
+++ b/gcc/ada/a-coorse.adb
@@ -6,11 +6,7 @@
 --                                                                          --
 --                                 B o d y                                  --
 --                                                                          --
---          Copyright (C) 2004-2005, 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  contents of the part following the private keyword. --
+--          Copyright (C) 2004-2006, Free Software Foundation, Inc.         --
 --                                                                          --
 -- 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- --
@@ -1375,11 +1371,49 @@ package body Ada.Containers.Ordered_Sets is
       Node : Node_Access;
       Item : Element_Type)
    is
+      pragma Assert (Node /= null);
+
+      function New_Node return Node_Access;
+      pragma Inline (New_Node);
+
+      procedure Local_Insert_Post is
+         new Element_Keys.Generic_Insert_Post (New_Node);
+
+      procedure Local_Insert_Sans_Hint is
+         new Element_Keys.Generic_Conditional_Insert (Local_Insert_Post);
+
+      procedure Local_Insert_With_Hint is
+         new Element_Keys.Generic_Conditional_Insert_With_Hint
+        (Local_Insert_Post,
+         Local_Insert_Sans_Hint);
+
+      --------------
+      -- New_Node --
+      --------------
+
+      function New_Node return Node_Access is
+      begin
+         Node.Element := Item;
+         Node.Color := Red;
+         Node.Parent := null;
+         Node.Right := null;
+         Node.Left := null;
+
+         return Node;
+      end New_Node;
+
+      Hint      : Node_Access;
+      Result    : Node_Access;
+      Inserted  : Boolean;
+
+      --  Start of processing for Insert
+
    begin
       if Item < Node.Element
         or else Node.Element < Item
       then
          null;
+
       else
          if Tree.Lock > 0 then
             raise Program_Error with
@@ -1390,95 +1424,38 @@ package body Ada.Containers.Ordered_Sets is
          return;
       end if;
 
-      Tree_Operations.Delete_Node_Sans_Free (Tree, Node);  -- Checks busy-bit
-
-      Insert_New_Item : declare
-         function New_Node return Node_Access;
-         pragma Inline (New_Node);
-
-         procedure Insert_Post is
-            new Element_Keys.Generic_Insert_Post (New_Node);
+      Hint := Element_Keys.Ceiling (Tree, Item);
 
-         procedure Insert is
-            new Element_Keys.Generic_Conditional_Insert (Insert_Post);
+      if Hint = null then
+         null;
 
-         --------------
-         -- New_Node --
-         --------------
+      elsif Item < Hint.Element then
+         if Hint = Node then
+            if Tree.Lock > 0 then
+               raise Program_Error with
+                 "attempt to tamper with cursors (set is locked)";
+            end if;
 
-         function New_Node return Node_Access is
-         begin
             Node.Element := Item;
-            Node.Color := Red;
-            Node.Parent := null;
-            Node.Right := null;
-            Node.Left := null;
-
-            return Node;
-         end New_Node;
-
-         Result   : Node_Access;
-         Inserted : Boolean;
-
-      --  Start of processing for Insert_New_Item
-
-      begin
-         Insert
-           (Tree    => Tree,
-            Key     => Item,
-            Node    => Result,
-            Success => Inserted);  --  TODO: change param name
-
-         if Inserted then
-            pragma Assert (Result = Node);
             return;
          end if;
-      exception
-         when others =>
-            null;  -- Assignment must have failed
-      end Insert_New_Item;
-
-      Reinsert_Old_Element : declare
-         function New_Node return Node_Access;
-         pragma Inline (New_Node);
-
-         procedure Insert_Post is
-            new Element_Keys.Generic_Insert_Post (New_Node);
-
-         procedure Insert is
-            new Element_Keys.Generic_Conditional_Insert (Insert_Post);
 
-         --------------
-         -- New_Node --
-         --------------
-
-         function New_Node return Node_Access is
-         begin
-            Node.Color := Red;
-            Node.Parent := null;
-            Node.Right := null;
-            Node.Left := null;
-
-            return Node;
-         end New_Node;
-
-         Result   : Node_Access;
-         Inserted : Boolean;
-
-      --  Start of processing for Reinsert_Old_Element
+      else
+         pragma Assert (not (Hint.Element < Item));
+         raise Program_Error with "attempt to replace existing element";
+      end if;
 
-      begin
-         Insert
-           (Tree    => Tree,
-            Key     => Node.Element,
-            Node    => Result,
-            Success => Inserted);  --  TODO: change param name
-      exception
-         when others =>
-            null;  -- Assignment must have failed
-      end Reinsert_Old_Element;
+      Tree_Operations.Delete_Node_Sans_Free (Tree, Node);  -- Checks busy-bit
 
-      raise Program_Error with "attempt to replace existing element";
+      Local_Insert_With_Hint
+        (Tree     => Tree,
+         Position => Hint,
+         Key      => Item,
+         Node     => Result,
+         Inserted => Inserted);
+
+      pragma Assert (Inserted);
+      pragma Assert (Result = Node);
    end Replace_Element;
 
    procedure Replace_Element