ada: Improve location of error messages in instantiations

When flag -gnatdF is used, source code lines are displayed to point
the location of errors. The code of the instantiation was displayed
in case of errors inside generic instances, which was not precise.
Now the code inside the generic is displayed.

gcc/ada/

	* errout.adb (Error_Msg_Internal): Store span for Optr field, and
	adapt to new type of Optr.
	(Finalize. Output_JSON_Message, Remove_Warning_Messages): Adapt to
	new type of Optr.
	(Output_Messages): Use Optr instead of Sptr to display code
	snippet closer to error.
	* erroutc.adb (dmsg): Adapt to new type of Optr.
	* erroutc.ads (Error_Msg_Object): Make Optr a span like Sptr.
	* errutil.adb (Error_Msg): Likewise.

4 files changed, 13 insertions, 12 deletions

diff --git a/gcc/ada/errout.adb b/gcc/ada/errout.adb
index 19ea155..dcd2177 100644
--- a/gcc/ada/errout.adb
+++ b/gcc/ada/errout.adb
@@ -1215,7 +1215,7 @@ package body Errout is
           Next                => No_Error_Msg,
           Prev                => No_Error_Msg,
           Sptr                => Span,
-          Optr                => Optr,
+          Optr                => Opan,
           Insertion_Sloc      => (if Has_Insertion_Line then Error_Msg_Sloc
                                   else No_Location),
           Sfile               => Get_Source_File_Index (Sptr),
@@ -1284,7 +1284,7 @@ package body Errout is
                        or else
                           (Sptr = Errors.Table (Last_Error_Msg).Sptr.Ptr
                              and then
-                               Optr > Errors.Table (Last_Error_Msg).Optr))
+                               Optr > Errors.Table (Last_Error_Msg).Optr.Ptr))
          then
             Prev_Msg := Last_Error_Msg;
             Next_Msg := No_Error_Msg;
@@ -1302,7 +1302,8 @@ package body Errout is
                then
                   exit when Sptr < Errors.Table (Next_Msg).Sptr.Ptr
                     or else (Sptr = Errors.Table (Next_Msg).Sptr.Ptr
-                              and then Optr < Errors.Table (Next_Msg).Optr);
+                              and then
+                             Optr < Errors.Table (Next_Msg).Optr.Ptr);
                end if;
 
                Prev_Msg := Next_Msg;
@@ -1681,8 +1682,8 @@ package body Errout is
                    (Warning_Specifically_Suppressed (CE.Sptr.Ptr, CE.Text, Tag)
                                                                 /= No_String
                       or else
-                    Warning_Specifically_Suppressed (CE.Optr, CE.Text, Tag) /=
-                                                                   No_String)
+                    Warning_Specifically_Suppressed (CE.Optr.Ptr, CE.Text, Tag)
+                                                                /= No_String)
             then
                Delete_Warning (Cur);
 
@@ -2232,9 +2233,9 @@ package body Errout is
       Write_Str (",""locations"":[");
       Write_JSON_Span (Errors.Table (E));
 
-      if Errors.Table (E).Optr /= Errors.Table (E).Sptr.Ptr then
+      if Errors.Table (E).Optr.Ptr /= Errors.Table (E).Sptr.Ptr then
          Write_Str (",{""caret"":");
-         Write_JSON_Location (Errors.Table (E).Optr);
+         Write_JSON_Location (Errors.Table (E).Optr.Ptr);
          Write_Str ("}");
       end if;
 
@@ -2954,7 +2955,7 @@ package body Errout is
                            else SGR_Error);
                      begin
                         Write_Source_Code_Lines
-                          (Errors.Table (E).Sptr, SGR_Span);
+                          (Errors.Table (E).Optr, SGR_Span);
                      end;
                   end if;
                end if;
@@ -3329,7 +3330,7 @@ package body Errout is
 
                --  Don't remove if location does not match
 
-               and then Errors.Table (E).Optr = Loc
+               and then Errors.Table (E).Optr.Ptr = Loc
 
                --  Don't remove if not warning/info message. Note that we do
                --  not remove style messages here. They are warning messages
diff --git a/gcc/ada/erroutc.adb b/gcc/ada/erroutc.adb
index 9ecc97f..7766c97 100644
--- a/gcc/ada/erroutc.adb
+++ b/gcc/ada/erroutc.adb
@@ -324,7 +324,7 @@ package body Erroutc is
 
       Write_Str
         ("  Optr     = ");
-      Write_Location (E.Optr);
+      Write_Location (E.Optr.Ptr);
       Write_Eol;
 
       w ("  Line     = ", Int (E.Line));
diff --git a/gcc/ada/erroutc.ads b/gcc/ada/erroutc.ads
index 7957228..c992bba 100644
--- a/gcc/ada/erroutc.ads
+++ b/gcc/ada/erroutc.ads
@@ -209,7 +209,7 @@ package Erroutc is
       --  will be posted. Note that an error placed on an instantiation will
       --  have Sptr pointing to the instantiation point.
 
-      Optr : Source_Ptr;
+      Optr : Source_Span;
       --  Flag location used in the call to post the error. This is the same as
       --  Sptr, except when an error is posted on a particular instantiation of
       --  a generic. In such a case, Sptr will point to the original source
diff --git a/gcc/ada/errutil.adb b/gcc/ada/errutil.adb
index 921de31..887dc88 100644
--- a/gcc/ada/errutil.adb
+++ b/gcc/ada/errutil.adb
@@ -208,7 +208,7 @@ package body Errutil is
             Prev                => No_Error_Msg,
             Sfile               => Get_Source_File_Index (Sptr),
             Sptr                => To_Span (Sptr),
-            Optr                => Optr,
+            Optr                => To_Span (Optr),
             Insertion_Sloc      => No_Location,
             Line                => Get_Physical_Line_Number (Sptr),
             Col                 => Get_Column_Number (Sptr),