ada: Create operator nodes in functional style

A recent patch removed two rewritings, where we kept the operator node
but replaced its operands. This patch removes explicit setting of the
operands; instead, the operator is already created together with its
operands, which seems a bit safer and more consistent with how we
typically create operator nodes.

It is a cleanup only; semantics is unaffected.

gcc/ada/

	* exp_ch4.adb
	(Expand_Modular_Addition): Rewrite using Make_XXX calls.
	(Expand_Modular_Op): Likewise.
	(Expand_Modular_Subtraction): Likewise.
	* exp_imgv.adb
	(Expand_User_Defined_Enumeration_Image): Likewise.

2 files changed, 76 insertions, 70 deletions

diff --git a/gcc/ada/exp_ch4.adb b/gcc/ada/exp_ch4.adb
index bbbcf4f..b9433c3 100644
--- a/gcc/ada/exp_ch4.adb
+++ b/gcc/ada/exp_ch4.adb
@@ -4154,39 +4154,42 @@ package body Exp_Ch4 is
                Mod_Minus_Right : constant Uint :=
                                    Modulus (Typ) - Intval (Right_Opnd (N));
 
-               Exprs     : constant List_Id := New_List;
-               Cond_Expr : constant Node_Id := New_Op_Node (N_Op_Lt, Loc);
-               Then_Expr : constant Node_Id := New_Op_Node (N_Op_Add, Loc);
-               Else_Expr : constant Node_Id := New_Op_Node (N_Op_Subtract,
-                                                            Loc);
+               Cond_Expr : Node_Id;
+               Then_Expr : Node_Id;
+               Else_Expr : Node_Id;
             begin
                --  To prevent spurious visibility issues, convert all
                --  operands to Standard.Unsigned.
 
-               Set_Left_Opnd (Cond_Expr,
-                 Unchecked_Convert_To (Standard_Unsigned,
-                   New_Copy_Tree (Left_Opnd (N))));
-               Set_Right_Opnd (Cond_Expr,
-                 Make_Integer_Literal (Loc, Mod_Minus_Right));
-               Append_To (Exprs, Cond_Expr);
-
-               Set_Left_Opnd (Then_Expr,
-                 Unchecked_Convert_To (Standard_Unsigned,
-                   New_Copy_Tree (Left_Opnd (N))));
-               Set_Right_Opnd (Then_Expr,
-                 Make_Integer_Literal (Loc, Intval (Right_Opnd (N))));
-               Append_To (Exprs, Then_Expr);
-
-               Set_Left_Opnd (Else_Expr,
-                 Unchecked_Convert_To (Standard_Unsigned,
-                   New_Copy_Tree (Left_Opnd (N))));
-               Set_Right_Opnd (Else_Expr,
-                 Make_Integer_Literal (Loc, Mod_Minus_Right));
-               Append_To (Exprs, Else_Expr);
+               Cond_Expr :=
+                 Make_Op_Lt (Loc,
+                   Left_Opnd  =>
+                     Unchecked_Convert_To (Standard_Unsigned,
+                       New_Copy_Tree (Left_Opnd (N))),
+                   Right_Opnd =>
+                     Make_Integer_Literal (Loc, Mod_Minus_Right));
+
+               Then_Expr :=
+                 Make_Op_Add (Loc,
+                   Left_Opnd  =>
+                     Unchecked_Convert_To (Standard_Unsigned,
+                       New_Copy_Tree (Left_Opnd (N))),
+                   Right_Opnd =>
+                     Make_Integer_Literal (Loc, Intval (Right_Opnd (N))));
+
+               Else_Expr :=
+                 Make_Op_Subtract (Loc,
+                   Left_Opnd  =>
+                     Unchecked_Convert_To (Standard_Unsigned,
+                       New_Copy_Tree (Left_Opnd (N))),
+                   Right_Opnd =>
+                     Make_Integer_Literal (Loc, Mod_Minus_Right));
 
                Rewrite (N,
                  Unchecked_Convert_To (Typ,
-                   Make_If_Expression (Loc, Expressions => Exprs)));
+                   Make_If_Expression (Loc,
+                     Expressions =>
+                       New_List (Cond_Expr, Then_Expr, Else_Expr))));
             end;
          end if;
       end Expand_Modular_Addition;
@@ -4202,7 +4205,7 @@ package body Exp_Ch4 is
          --   backend does not have to deal with nonbinary-modulus ops.
 
          Op_Expr  : constant Node_Id := New_Op_Node (Nkind (N), Loc);
-         Mod_Expr : constant Node_Id := New_Op_Node (N_Op_Mod, Loc);
+         Mod_Expr : Node_Id;
 
          Target_Type : Entity_Id;
       begin
@@ -4297,10 +4300,10 @@ package body Exp_Ch4 is
             Force_Evaluation (Op_Expr, Mode => Strict);
          end if;
 
-         Set_Left_Opnd (Mod_Expr, Op_Expr);
-
-         Set_Right_Opnd (Mod_Expr,
-           Make_Integer_Literal (Loc, Modulus (Typ)));
+         Mod_Expr :=
+           Make_Op_Mod (Loc,
+             Left_Opnd  => Op_Expr,
+             Right_Opnd => Make_Integer_Literal (Loc, Modulus (Typ)));
 
          Rewrite (N,
            Unchecked_Convert_To (Typ, Mod_Expr));
@@ -4331,37 +4334,40 @@ package body Exp_Ch4 is
                Mod_Minus_Right : constant Uint :=
                                    Modulus (Typ) - Intval (Right_Opnd (N));
 
-               Exprs     : constant List_Id := New_List;
-               Cond_Expr : constant Node_Id := New_Op_Node (N_Op_Lt, Loc);
-               Then_Expr : constant Node_Id := New_Op_Node (N_Op_Add, Loc);
-               Else_Expr : constant Node_Id := New_Op_Node (N_Op_Subtract,
-                                                            Loc);
+               Cond_Expr : Node_Id;
+               Then_Expr : Node_Id;
+               Else_Expr : Node_Id;
             begin
-               Set_Left_Opnd (Cond_Expr,
-                 Unchecked_Convert_To (Standard_Unsigned,
-                   New_Copy_Tree (Left_Opnd (N))));
-               Set_Right_Opnd (Cond_Expr,
-                 Make_Integer_Literal (Loc, Intval (Right_Opnd (N))));
-               Append_To (Exprs, Cond_Expr);
-
-               Set_Left_Opnd (Then_Expr,
-                 Unchecked_Convert_To (Standard_Unsigned,
-                   New_Copy_Tree (Left_Opnd (N))));
-               Set_Right_Opnd (Then_Expr,
-                 Make_Integer_Literal (Loc, Mod_Minus_Right));
-               Append_To (Exprs, Then_Expr);
-
-               Set_Left_Opnd (Else_Expr,
-                 Unchecked_Convert_To (Standard_Unsigned,
-                   New_Copy_Tree (Left_Opnd (N))));
-               Set_Right_Opnd (Else_Expr,
-                 Unchecked_Convert_To (Standard_Unsigned,
-                   New_Copy_Tree (Right_Opnd (N))));
-               Append_To (Exprs, Else_Expr);
+               Cond_Expr :=
+                 Make_Op_Lt (Loc,
+                   Left_Opnd  =>
+                     Unchecked_Convert_To (Standard_Unsigned,
+                       New_Copy_Tree (Left_Opnd (N))),
+                   Right_Opnd =>
+                     Make_Integer_Literal (Loc, Intval (Right_Opnd (N))));
+
+               Then_Expr :=
+                 Make_Op_Add (Loc,
+                   Left_Opnd  =>
+                     Unchecked_Convert_To (Standard_Unsigned,
+                       New_Copy_Tree (Left_Opnd (N))),
+                   Right_Opnd =>
+                     Make_Integer_Literal (Loc, Mod_Minus_Right));
+
+               Else_Expr :=
+                 Make_Op_Subtract (Loc,
+                   Left_Opnd  =>
+                     Unchecked_Convert_To (Standard_Unsigned,
+                       New_Copy_Tree (Left_Opnd (N))),
+                   Right_Opnd =>
+                     Unchecked_Convert_To (Standard_Unsigned,
+                       New_Copy_Tree (Right_Opnd (N))));
 
                Rewrite (N,
                  Unchecked_Convert_To (Typ,
-                   Make_If_Expression (Loc, Expressions => Exprs)));
+                   Make_If_Expression (Loc,
+                     Expressions =>
+                       New_List (Cond_Expr, Then_Expr, Else_Expr))));
             end;
          end if;
       end Expand_Modular_Subtraction;
diff --git a/gcc/ada/exp_imgv.adb b/gcc/ada/exp_imgv.adb
index 51f1195..f2043f5 100644
--- a/gcc/ada/exp_imgv.adb
+++ b/gcc/ada/exp_imgv.adb
@@ -938,12 +938,12 @@ package body Exp_Imgv is
          --    P3 : constant Natural := call_put_enumN (P1 + 1);
 
          declare
-            Add_Node : constant Node_Id := New_Op_Node (N_Op_Add, Loc);
+            Add_Node : constant Node_Id :=
+              Make_Op_Add (Loc,
+                Left_Opnd  => New_Occurrence_Of (P1_Id, Loc),
+                Right_Opnd => Make_Integer_Literal (Loc, Uint_1));
 
          begin
-            Set_Left_Opnd  (Add_Node, New_Occurrence_Of (P1_Id, Loc));
-            Set_Right_Opnd (Add_Node, Make_Integer_Literal (Loc, 1));
-
             Append_To (Ins_List,
               Make_Object_Declaration (Loc,
                 Defining_Identifier => P3_Id,
@@ -963,12 +963,12 @@ package body Exp_Imgv is
          --    P4 : String renames call_put_enumS (P2 .. P3 - 1);
 
          declare
-            Sub_Node : constant Node_Id := New_Op_Node (N_Op_Subtract, Loc);
+            Sub_Node : constant Node_Id :=
+              Make_Op_Subtract (Loc,
+                Left_Opnd  => New_Occurrence_Of (P3_Id, Loc),
+                Right_Opnd => Make_Integer_Literal (Loc, Uint_1));
 
          begin
-            Set_Left_Opnd  (Sub_Node, New_Occurrence_Of (P3_Id, Loc));
-            Set_Right_Opnd (Sub_Node, Make_Integer_Literal (Loc, 1));
-
             Append_To (Ins_List,
               Make_Object_Renaming_Declaration (Loc,
                 Defining_Identifier => P4_Id,
@@ -988,12 +988,12 @@ package body Exp_Imgv is
          --    subtype S1 is String (1 .. P3 - P2);
 
          declare
-            HB : constant Node_Id := New_Op_Node (N_Op_Subtract, Loc);
+            HB : constant Node_Id :=
+              Make_Op_Subtract (Loc,
+                Left_Opnd  => New_Occurrence_Of (P3_Id, Loc),
+                Right_Opnd => New_Occurrence_Of (P2_Id, Loc));
 
          begin
-            Set_Left_Opnd  (HB, New_Occurrence_Of (P3_Id, Loc));
-            Set_Right_Opnd (HB, New_Occurrence_Of (P2_Id, Loc));
-
             Append_To (Ins_List,
               Make_Subtype_Declaration (Loc,
                 Defining_Identifier => S1_Id,