[multiple changes]

2011-08-05  Matthew Heaney  <heaney@adacore.com>

	* a-comutr.adb, a-cimutr.adb, a-cbmutr.adb (Read): do not use T'Valid
	to check count, check sign of value instead.
	* a-comutr.adb, a-cimutr.adb (Write): return immediately if tree empty
	(Copy_Subtree): allocate copy of source element
	(Equal_Subtree): compare elements, not access objects

2011-08-05  Vincent Celier  <celier@adacore.com>

	* gnat_ugn.texi: Fix VMS alternative.

From-SVN: r177457

gcc/ada/ChangeLog

+2011-08-05  Matthew Heaney  <heaney@adacore.com>
+
+	* a-comutr.adb, a-cimutr.adb, a-cbmutr.adb (Read): do not use T'Valid
+	to check count, check sign of value instead.
+	* a-comutr.adb, a-cimutr.adb (Write): return immediately if tree empty
+	(Copy_Subtree): allocate copy of source element
+	(Equal_Subtree): compare elements, not access objects
+
+2011-08-05  Vincent Celier  <celier@adacore.com>
+
+	* gnat_ugn.texi: Fix VMS alternative.
+
 2011-08-05  Thomas Quinot  <quinot@adacore.com>
 
 	* sem_ch11.adb: Add comment.

gcc/ada/a-cbmutr.adb

@@ -2117,20 +2117,26 @@ package body Ada.Containers.Bounded_Multiway_Trees is
 
       NN : Tree_Node_Array renames Container.Nodes;
 
-      Total_Count, Read_Count : Count_Type;
+      Total_Count : Count_Type'Base;
+      --  Value read from the stream that says how many elements follow
+
+      Read_Count : Count_Type'Base;
+      --  Actual number of elements read from the stream
 
       -------------------
       -- Read_Children --
       -------------------
 
       procedure Read_Children (Subtree : Count_Type) is
-         Count : Count_Type;  -- number of child subtrees
-         CC    : Children_Type;
+         Count : Count_Type'Base;
+         --  number of child subtrees
+
+         CC : Children_Type;
 
       begin
          Count_Type'Read (Stream, Count);
 
-         if not Count'Valid then  -- Is this check necessary???
+         if Count < 0 then
             raise Program_Error with "attempt to read from corrupt stream";
          end if;
 
@@ -2180,7 +2186,7 @@ package body Ada.Containers.Bounded_Multiway_Trees is
 
       Count_Type'Read (Stream, Total_Count);
 
-      if not Total_Count'Valid then  -- Is this check necessary???
+      if Total_Count < 0 then
          raise Program_Error with "attempt to read from corrupt stream";
       end if;
 

gcc/ada/a-cimutr.adb

@@ -556,8 +556,10 @@ package body Ada.Containers.Indefinite_Multiway_Trees is
       Target : out Tree_Node_Access;
       Count  : in out Count_Type)
    is
+      E : constant Element_Access := new Element_Type'(Source.Element.all);
+
    begin
-      Target := new Tree_Node_Type'(Element => Source.Element,
+      Target := new Tree_Node_Type'(Element => E,
                                     Parent  => Parent,
                                     others  => <>);
 
@@ -886,7 +888,7 @@ package body Ada.Containers.Indefinite_Multiway_Trees is
       Right_Subtree : Tree_Node_Access) return Boolean
    is
    begin
-      if Left_Subtree.Element /= Right_Subtree.Element then
+      if Left_Subtree.Element.all /= Right_Subtree.Element.all then
          return False;
       end if;
 
@@ -1638,8 +1640,11 @@ package body Ada.Containers.Indefinite_Multiway_Trees is
       function Read_Subtree
         (Parent : Tree_Node_Access) return Tree_Node_Access;
 
-      Total_Count : Count_Type;
-      Read_Count  : Count_Type;
+      Total_Count : Count_Type'Base;
+      --  Value read from the stream that says how many elements follow
+
+      Read_Count : Count_Type'Base;
+      --  Actual number of elements read from the stream
 
       -------------------
       -- Read_Children --
@@ -1650,7 +1655,7 @@ package body Ada.Containers.Indefinite_Multiway_Trees is
          pragma Assert (Subtree.Children.First = null);
          pragma Assert (Subtree.Children.Last = null);
 
-         Count : Count_Type;
+         Count : Count_Type'Base;
          --  Number of child subtrees
 
          C : Children_Type;
@@ -1658,7 +1663,7 @@ package body Ada.Containers.Indefinite_Multiway_Trees is
       begin
          Count_Type'Read (Stream, Count);
 
-         if not Count'Valid then  -- Is this check necessary???
+         if Count < 0 then
             raise Program_Error with "attempt to read from corrupt stream";
          end if;
 
@@ -1712,7 +1717,7 @@ package body Ada.Containers.Indefinite_Multiway_Trees is
 
       Count_Type'Read (Stream, Total_Count);
 
-      if not Total_Count'Valid then  -- Is this check necessary???
+      if Total_Count < 0 then
          raise Program_Error with "attempt to read from corrupt stream";
       end if;
 
@@ -2383,6 +2388,11 @@ package body Ada.Containers.Indefinite_Multiway_Trees is
 
    begin
       Count_Type'Write (Stream, Container.Count);
+
+      if Container.Count = 0 then
+         return;
+      end if;
+
       Write_Children (Root_Node (Container));
    end Write;
 

gcc/ada/a-comutr.adb

@@ -1681,7 +1681,11 @@ package body Ada.Containers.Multiway_Trees is
       function Read_Subtree
         (Parent : Tree_Node_Access) return Tree_Node_Access;
 
-      Total_Count, Read_Count : Count_Type;
+      Total_Count : Count_Type'Base;
+      --  Value read from the stream that says how many elements follow
+
+      Read_Count : Count_Type'Base;
+      --  Actual number of elements read from the stream
 
       -------------------
       -- Read_Children --
@@ -1692,13 +1696,15 @@ package body Ada.Containers.Multiway_Trees is
          pragma Assert (Subtree.Children.First = null);
          pragma Assert (Subtree.Children.Last = null);
 
-         Count : Count_Type;  -- number of child subtrees
-         C     : Children_Type;
+         Count : Count_Type'Base;
+         --  Number of child subtrees
+
+         C : Children_Type;
 
       begin
          Count_Type'Read (Stream, Count);
 
-         if not Count'Valid then  -- Is this check necessary???
+         if Count < 0 then
             raise Program_Error with "attempt to read from corrupt stream";
          end if;
 
@@ -1749,7 +1755,7 @@ package body Ada.Containers.Multiway_Trees is
 
       Count_Type'Read (Stream, Total_Count);
 
-      if not Total_Count'Valid then  -- Is this check necessary???
+      if Total_Count < 0 then
          raise Program_Error with "attempt to read from corrupt stream";
       end if;
 
@@ -2428,6 +2434,11 @@ package body Ada.Containers.Multiway_Trees is
 
    begin
       Count_Type'Write (Stream, Container.Count);
+
+      if Container.Count = 0 then
+         return;
+      end if;
+
       Write_Children (Root_Node (Container));
    end Write;
 

gcc/ada/gnat_ugn.texi

@@ -6312,7 +6312,7 @@ example:
 
 @item ^C^COMMENTS1^ (single space)
 @emph{Check comments, single space.}
-This is identical to @code{^c^COMMENTS} except that only one space
+This is identical to @code{^c^COMMENTS^} except that only one space
 is required following the @code{--} of a comment instead of two.
 
 @item ^d^DOS_LINE_ENDINGS^