[Ada] Variable-sized node types

[thirdparty/gcc.git] / gcc / ada / sem_ch2.adb

------------------------------------------------------------------------------
--                                                                          --
--                         GNAT COMPILER COMPONENTS                         --
--                                                                          --
--                              S E M _ C H 2                               --
--                                                                          --
--                                 B o d y                                  --
--                                                                          --
--          Copyright (C) 1992-2021, 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- --
-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
-- for  more details.  You should have  received  a copy of the GNU General --
-- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
-- http://www.gnu.org/licenses for a complete copy of the license.          --
--                                                                          --
-- GNAT was originally developed  by the GNAT team at  New York University. --
-- Extensive contributions were provided by Ada Core Technologies Inc.      --
--                                                                          --
------------------------------------------------------------------------------

with Atree;    use Atree;
with Einfo; use Einfo;
with Einfo.Utils; use Einfo.Utils;
with Namet;    use Namet;
with Opt;      use Opt;
with Restrict; use Restrict;
with Rident;   use Rident;
with Sem_Ch8;  use Sem_Ch8;
with Sem_Dim;  use Sem_Dim;
with Sinfo; use Sinfo;
with Sinfo.Nodes; use Sinfo.Nodes;
with Stand;    use Stand;
with Uintp;    use Uintp;

package body Sem_Ch2 is

   -------------------------------
   -- Analyze_Character_Literal --
   -------------------------------

   procedure Analyze_Character_Literal (N : Node_Id) is
   begin
      --  The type is eventually inherited from the context. If expansion
      --  has already established the proper type, do not modify it.

      if No (Etype (N)) then
         Set_Etype (N, Any_Character);
      end if;

      Set_Is_Static_Expression (N);

      if Comes_From_Source (N)
        and then not In_Character_Range (UI_To_CC (Char_Literal_Value (N)))
      then
         Check_Restriction (No_Wide_Characters, N);
      end if;
   end Analyze_Character_Literal;

   ------------------------
   -- Analyze_Identifier --
   ------------------------

   procedure Analyze_Identifier (N : Node_Id) is
   begin
      --  Ignore call if prior errors, and identifier has no name, since
      --  this is the result of some kind of previous error generating a
      --  junk identifier.

      if not Is_Valid_Name (Chars (N)) and then Total_Errors_Detected /= 0 then
         return;
      else
         Find_Direct_Name (N);
      end if;

      Analyze_Dimension (N);
   end Analyze_Identifier;

   -----------------------------
   -- Analyze_Integer_Literal --
   -----------------------------

   procedure Analyze_Integer_Literal (N : Node_Id) is
   begin
      --  As a lexical element, an integer literal has type Universal_Integer,
      --  i.e., is compatible with any integer type. This is semantically
      --  consistent and simplifies type checking and subsequent constant
      --  folding when needed. An exception is caused by 64-bit modular types,
      --  whose upper bound is not representable in a nonstatic context that
      --  will use 64-bit integers at run time. For such cases, we need to
      --  preserve the information that the analyzed literal has that modular
      --  type. For simplicity, we preserve the information for all integer
      --  literals that result from a modular operation. This happens after
      --  prior analysis (or construction) of the literal, and after type
      --  checking and resolution.

      if No (Etype (N)) or else not Is_Modular_Integer_Type (Etype (N)) then
         Set_Etype (N, Universal_Integer);
      end if;

      Set_Is_Static_Expression (N);
   end Analyze_Integer_Literal;

   --------------------------
   -- Analyze_Real_Literal --
   --------------------------

   procedure Analyze_Real_Literal (N : Node_Id) is
   begin
      Set_Etype (N, Universal_Real);
      Set_Is_Static_Expression (N);
   end Analyze_Real_Literal;

   ----------------------------
   -- Analyze_String_Literal --
   ----------------------------

   procedure Analyze_String_Literal (N : Node_Id) is
   begin
      --  The type is eventually inherited from the context. If expansion
      --  has already established the proper type, do not modify it.

      if No (Etype (N)) then
         Set_Etype (N, Any_String);
      end if;

      --  String literals are static in Ada 95. Note that if the subtype
      --  turns out to be non-static, then the Is_Static_Expression flag
      --  will be reset in Eval_String_Literal.

      if Ada_Version >= Ada_95 then
         Set_Is_Static_Expression (N);
      end if;

      if Comes_From_Source (N) and then Has_Wide_Character (N) then
         Check_Restriction (No_Wide_Characters, N);
      end if;
   end Analyze_String_Literal;

end Sem_Ch2;