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) 1992-2021, 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 Einfo.Utils;    use Einfo.Utils;
  29 with Namet;          use Namet;
  30 with Opt;            use Opt;
  31 with Restrict;       use Restrict;
  32 with Rident;         use Rident;
  33 with Sem_Ch8;        use Sem_Ch8;
  34 with Sem_Dim;        use Sem_Dim;
  35 with Sinfo;          use Sinfo;
  36 with Sinfo.Nodes;    use Sinfo.Nodes;
  37 with Stand;          use Stand;
  38 with Uintp;          use Uintp;
  39
  40 package body Sem_Ch2 is
  41
  42    -------------------------------
  43    -- Analyze_Character_Literal --
  44    -------------------------------
  45
  46    procedure Analyze_Character_Literal (N : Node_Id) is
  47    begin
  48       --  The type is eventually inherited from the context. If expansion
  49       --  has already established the proper type, do not modify it.
  50
  51       if No (Etype (N)) then
  52          Set_Etype (N, Any_Character);
  53       end if;
  54
  55       Set_Is_Static_Expression (N);
  56
  57       if Comes_From_Source (N)
  58         and then not In_Character_Range (UI_To_CC (Char_Literal_Value (N)))
  59       then
  60          Check_Restriction (No_Wide_Characters, N);
  61       end if;
  62    end Analyze_Character_Literal;
  63
  64    ------------------------
  65    -- Analyze_Identifier --
  66    ------------------------
  67
  68    procedure Analyze_Identifier (N : Node_Id) is
  69    begin
  70       --  Ignore call if prior errors, and identifier has no name, since
  71       --  this is the result of some kind of previous error generating a
  72       --  junk identifier.
  73
  74       if not Is_Valid_Name (Chars (N)) and then Total_Errors_Detected /= 0 then
  75          return;
  76       else
  77          Find_Direct_Name (N);
  78       end if;
  79
  80       Analyze_Dimension (N);
  81    end Analyze_Identifier;
  82
  83    -----------------------------
  84    -- Analyze_Integer_Literal --
  85    -----------------------------
  86
  87    procedure Analyze_Integer_Literal (N : Node_Id) is
  88    begin
  89       --  As a lexical element, an integer literal has type Universal_Integer,
  90       --  i.e., is compatible with any integer type. This is semantically
  91       --  consistent and simplifies type checking and subsequent constant
  92       --  folding when needed. An exception is caused by 64-bit modular types,
  93       --  whose upper bound is not representable in a nonstatic context that
  94       --  will use 64-bit integers at run time. For such cases, we need to
  95       --  preserve the information that the analyzed literal has that modular
  96       --  type. For simplicity, we preserve the information for all integer
  97       --  literals that result from a modular operation. This happens after
  98       --  prior analysis (or construction) of the literal, and after type
  99       --  checking and resolution.
 100
 101       if No (Etype (N)) or else not Is_Modular_Integer_Type (Etype (N)) then
 102          Set_Etype (N, Universal_Integer);
 103       end if;
 104
 105       Set_Is_Static_Expression (N);
 106    end Analyze_Integer_Literal;
 107
 108    --------------------------
 109    -- Analyze_Real_Literal --
 110    --------------------------
 111
 112    procedure Analyze_Real_Literal (N : Node_Id) is
 113    begin
 114       Set_Etype (N, Universal_Real);
 115       Set_Is_Static_Expression (N);
 116    end Analyze_Real_Literal;
 117
 118    ----------------------------
 119    -- Analyze_String_Literal --
 120    ----------------------------
 121
 122    procedure Analyze_String_Literal (N : Node_Id) is
 123    begin
 124       --  The type is eventually inherited from the context. If expansion
 125       --  has already established the proper type, do not modify it.
 126
 127       if No (Etype (N)) then
 128          Set_Etype (N, Any_String);
 129       end if;
 130
 131       --  String literals are static in Ada 95. Note that if the subtype
 132       --  turns out to be non-static, then the Is_Static_Expression flag
 133       --  will be reset in Eval_String_Literal.
 134
 135       if Ada_Version >= Ada_95 then
 136          Set_Is_Static_Expression (N);
 137       end if;
 138
 139       if Comes_From_Source (N) and then Has_Wide_Character (N) then
 140          Check_Restriction (No_Wide_Characters, N);
 141       end if;
 142    end Analyze_String_Literal;
 143
 144 end Sem_Ch2;