[multiple changes]

2017-04-25  Eric Botcazou  <ebotcazou@adacore.com>

	* fname.adb (Is_Internal_File_Name): Arrange for the slices to
	have a length which is a power of 2.
	(Is_Predefined_File_Name): Likewise. Adjust comment.

2017-04-25  Bob Duff  <duff@adacore.com>

	* exp_aggr.adb (Component_Count): Protect the
	arithmetic from attempting to convert a value >= 2**31 to Int,
	which would otherwise raise Constraint_Error.

2017-04-25  Bob Duff  <duff@adacore.com>

	* opt.ads (Locking_Policy): Fix incorrect documentation. The
	first character of the policy name is not unique.

2017-04-25  Bob Duff  <duff@adacore.com>

	* s-fileio.adb (Name): Raise Use_Error if the file is a temp file.
	* s-ficobl.ads (Is_Temporary_File): Remove incorrect comment
	about this flag not being used. It was already used, and it is
	now used more.

From-SVN: r247183

gcc/ada/ChangeLog

+2017-04-25  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* fname.adb (Is_Internal_File_Name): Arrange for the slices to
+	have a length which is a power of 2.
+	(Is_Predefined_File_Name): Likewise. Adjust comment.
+
+2017-04-25  Bob Duff  <duff@adacore.com>
+
+	* exp_aggr.adb (Component_Count): Protect the
+	arithmetic from attempting to convert a value >= 2**31 to Int,
+	which would otherwise raise Constraint_Error.
+
+2017-04-25  Bob Duff  <duff@adacore.com>
+
+	* opt.ads (Locking_Policy): Fix incorrect documentation. The
+	first character of the policy name is not unique.
+
+2017-04-25  Bob Duff  <duff@adacore.com>
+
+	* s-fileio.adb (Name): Raise Use_Error if the file is a temp file.
+	* s-ficobl.ads (Is_Temporary_File): Remove incorrect comment
+	about this flag not being used. It was already used, and it is
+	now used more.
+
 2017-04-25  Hristian Kirtchev  <kirtchev@adacore.com>
 
 	* einfo.adb Flag301 is now known as Ignore_SPARK_Mode_Pragmas.

gcc/ada/exp_aggr.adb

@@ -352,7 +352,7 @@ package body Exp_Aggr is
       --  which hit memory limits in the backend.
 
       function Component_Count (T : Entity_Id) return Nat;
-      --  The limit is applied to the total number of components that the
+      --  The limit is applied to the total number of subcomponents that the
       --  aggregate will have, which is the number of static expressions
       --  that will appear in the flattened array. This requires a recursive
       --  computation of the number of scalar components of the structure.
@@ -399,8 +399,20 @@ package body Exp_Aggr is
                   return 0;
 
                else
-                  return
-                    Siz * UI_To_Int (Expr_Value (Hi) - Expr_Value (Lo) + 1);
+                  --  If the number of components is greater than Int'Last,
+                  --  then return Int'Last, so caller will return False (Aggr
+                  --  size is not OK). Otherwise, UI_To_Int will crash.
+
+                  declare
+                     UI : constant Uint :=
+                            Expr_Value (Hi) - Expr_Value (Lo) + 1;
+                  begin
+                     if UI_Is_In_Int_Range (UI) then
+                        return Siz * UI_To_Int (UI);
+                     else
+                        return Int'Last;
+                     end if;
+                  end;
                end if;
             end;
 

gcc/ada/fname.adb

@@ -119,7 +119,15 @@ package body Fname is
          return False;
       end if;
 
-      return Has_Prefix (Fname, "g-") or else Has_Prefix (Fname, "gnat.");
+      --  Definitely internal if prefix is g-
+
+      if Has_Prefix (Fname, "g-") then
+         return True;
+      end if;
+
+      --  See the note in Is_Predefined_File_Name for the rationale
+
+      return Fname'Length = 8 and then Has_Prefix (Fname, "gnat");
    end Is_Internal_File_Name;
 
    function Is_Internal_File_Name
@@ -154,9 +162,12 @@ package body Fname is
          "text_io.");  --  Text_IO
 
       --  Note: the implementation is optimized to perform uniform comparisons
-      --  on string slices whose length is known at compile time and at most 8
-      --  characters; the remaining calls to Has_Prefix must be inlined so as
-      --  to expose the compile-time known length.
+      --  on string slices whose length is known at compile time and is a small
+      --  power of 2 (at most 8 characters); the remaining calls to Has_Prefix
+      --  must be inlined to expose the compile-time known length. There must
+      --  be no calls to the fallback string comparison routine (e.g. memcmp)
+      --  left in the object code for the function; this can save up to 10% of
+      --  the entire compilation time spent in the front end.
 
    begin
       if not Has_Internal_Extension (Fname) then
@@ -187,7 +198,7 @@ package body Fname is
 
       if Has_Prefix (Fname, "ada.")             --  Ada
         or else Has_Prefix (Fname, "interfac")  --  Interfaces
-        or else Has_Prefix (Fname, "system.")   --  System
+        or else Has_Prefix (Fname, "system.a")  --  System
       then
          return True;
       end if;

gcc/ada/opt.ads

@@ -1021,9 +1021,12 @@ package Opt is
 
    Locking_Policy : Character := ' ';
    --  GNAT, GNATBIND
-   --  Set to ' ' for the default case (no locking policy specified). Reset to
-   --  first character (uppercase) of locking policy name if a valid pragma
-   --  Locking_Policy is encountered.
+
+   --  Set to ' ' for the default case (no locking policy specified). Otherwise
+   --  set based on the pragma Locking_Policy:
+   --     Ceiling_Locking: 'C'
+   --     Concurrent_Readers_Locking: 'R'
+   --     Inheritance_Locking: 'I'
 
    Locking_Policy_Sloc : Source_Ptr := No_Location;
    --  GNAT, GNATBIND

gcc/ada/s-ficobl.ads

@@ -108,10 +108,7 @@ package System.File_Control_Block is
 
       Is_Temporary_File : Boolean;
       --  A flag set only for temporary files (i.e. files created using the
-      --  Create function with a null name parameter, using tmpfile). This
-      --  is currently not used since temporary files are deleted by the
-      --  operating system, but it is set properly in case some systems
-      --  need this information in the future.
+      --  Create function with a null name parameter).
 
       Is_System_File : Boolean;
       --  A flag set only for system files (stdin, stdout, stderr)

gcc/ada/s-fileio.adb

@@ -744,6 +744,8 @@ package body System.File_IO is
    begin
       if File = null then
          raise Status_Error with "Name: file not open";
+      elsif File.Is_Temporary_File then
+         raise Use_Error with "Name: temporary file has no name";
       else
          return File.Name.all (1 .. File.Name'Length - 1);
       end if;