gcc/ada/sem_ch2.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                              S E M _ C H 2                               --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2020, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT; see file COPYING3.  If not, go to --
  19 -- http://www.gnu.org/licenses for a complete copy of the license.          --
  20 --                                                                          --
  21 -- GNAT was originally developed  by the GNAT team at  New York University. --
  22 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  23 --                                                                          --
  24 ------------------------------------------------------------------------------
  25
  26 with Atree;    use Atree;
  27 with Einfo;    use Einfo;
  28 with Namet;    use Namet;
  29 with Opt;      use Opt;
  30 with Restrict; use Restrict;
  31 with Rident;   use Rident;
  32 with Sem_Ch8;  use Sem_Ch8;
  33 with Sem_Dim;  use Sem_Dim;
  34 with Sinfo;    use Sinfo;
  35 with Stand;    use Stand;
  36 with Uintp;    use Uintp;
  37
  38 package body Sem_Ch2 is
  39
  40    -------------------------------
  41    -- Analyze_Character_Literal --
  42    -------------------------------
  43
  44    procedure Analyze_Character_Literal (N : Node_Id) is
  45    begin
  46       --  The type is eventually inherited from the context. If expansion
  47       --  has already established the proper type, do not modify it.
  48
  49       if No (Etype (N)) then
  50          Set_Etype (N, Any_Character);
  51       end if;
  52
  53       Set_Is_Static_Expression (N);
  54
  55       if Comes_From_Source (N)
  56         and then not In_Character_Range (UI_To_CC (Char_Literal_Value (N)))
  57       then
  58          Check_Restriction (No_Wide_Characters, N);
  59       end if;
  60    end Analyze_Character_Literal;
  61
  62    ------------------------
  63    -- Analyze_Identifier --
  64    ------------------------
  65
  66    procedure Analyze_Identifier (N : Node_Id) is
  67    begin
  68       --  Ignore call if prior errors, and identifier has no name, since
  69       --  this is the result of some kind of previous error generating a
  70       --  junk identifier.
  71
  72       if not Is_Valid_Name (Chars (N)) and then Total_Errors_Detected /= 0 then
  73          return;
  74       else
  75          Find_Direct_Name (N);
  76       end if;
  77
  78       Analyze_Dimension (N);
  79    end Analyze_Identifier;
  80
  81    -----------------------------
  82    -- Analyze_Integer_Literal --
  83    -----------------------------
  84
  85    procedure Analyze_Integer_Literal (N : Node_Id) is
  86    begin
  87       --  As a lexical element, an integer literal has type Universal_Integer,
  88       --  i.e., is compatible with any integer type. This is semantically
  89       --  consistent and simplifies type checking and subsequent constant
  90       --  folding when needed. An exception is caused by 64-bit modular types,
  91       --  whose upper bound is not representable in a nonstatic context that
  92       --  will use 64-bit integers at run time. For such cases, we need to
  93       --  preserve the information that the analyzed literal has that modular
  94       --  type. For simplicity, we preserve the information for all integer
  95       --  literals that result from a modular operation. This happens after
  96       --  prior analysis (or construction) of the literal, and after type
  97       --  checking and resolution.
  98
  99       if No (Etype (N)) or else not Is_Modular_Integer_Type (Etype (N)) then
 100          Set_Etype (N, Universal_Integer);
 101       end if;
 102
 103       Set_Is_Static_Expression (N);
 104    end Analyze_Integer_Literal;
 105
 106    --------------------------
 107    -- Analyze_Real_Literal --
 108    --------------------------
 109
 110    procedure Analyze_Real_Literal (N : Node_Id) is
 111    begin
 112       Set_Etype (N, Universal_Real);
 113       Set_Is_Static_Expression (N);
 114    end Analyze_Real_Literal;
 115
 116    ----------------------------
 117    -- Analyze_String_Literal --
 118    ----------------------------
 119
 120    procedure Analyze_String_Literal (N : Node_Id) is
 121    begin
 122       --  The type is eventually inherited from the context. If expansion
 123       --  has already established the proper type, do not modify it.
 124
 125       if No (Etype (N)) then
 126          Set_Etype (N, Any_String);
 127       end if;
 128
 129       --  String literals are static in Ada 95. Note that if the subtype
 130       --  turns out to be non-static, then the Is_Static_Expression flag
 131       --  will be reset in Eval_String_Literal.
 132
 133       if Ada_Version >= Ada_95 then
 134          Set_Is_Static_Expression (N);
 135       end if;
 136
 137       if Comes_From_Source (N) and then Has_Wide_Character (N) then
 138          Check_Restriction (No_Wide_Characters, N);
 139       end if;
 140    end Analyze_String_Literal;
 141
 142 end Sem_Ch2;