gcc/ada/scans.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                                S C A N S                                 --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2007, 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 2,  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 COPYING.  If not, write --
  19 -- to  the  Free Software Foundation,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, USA.                                              --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  33
  34 with Snames; use Snames;
  35
  36 package body Scans is
  37
  38    -----------------------------
  39    -- Initialize_Ada_Keywords --
  40    -----------------------------
  41
  42    procedure Initialize_Ada_Keywords is
  43       procedure Set_Reserved (N : Name_Id; T : Token_Type);
  44       pragma Inline (Set_Reserved);
  45       --  Set given name as a reserved word (T is the corresponding token)
  46
  47       ------------------
  48       -- Set_Reserved --
  49       ------------------
  50
  51       procedure Set_Reserved (N : Name_Id; T : Token_Type) is
  52       begin
  53          --  Set up Token_Type values in Names table entries for reserved
  54          --  words. We use the Pos value of the Token_Type value. Note that
  55          --  Is_Keyword_Name relies on the fact that Token_Type'Val (0) is not
  56          --  a reserved word!
  57
  58          Set_Name_Table_Byte (N, Token_Type'Pos (T));
  59       end Set_Reserved;
  60
  61    --  Start of processing for Initialize_Ada_Keywords
  62
  63    begin
  64       --  Establish reserved words
  65
  66       Set_Reserved (Name_Abort,     Tok_Abort);
  67       Set_Reserved (Name_Abs,       Tok_Abs);
  68       Set_Reserved (Name_Abstract,  Tok_Abstract);
  69       Set_Reserved (Name_Accept,    Tok_Accept);
  70       Set_Reserved (Name_Access,    Tok_Access);
  71       Set_Reserved (Name_And,       Tok_And);
  72       Set_Reserved (Name_Aliased,   Tok_Aliased);
  73       Set_Reserved (Name_All,       Tok_All);
  74       Set_Reserved (Name_Array,     Tok_Array);
  75       Set_Reserved (Name_At,        Tok_At);
  76       Set_Reserved (Name_Begin,     Tok_Begin);
  77       Set_Reserved (Name_Body,      Tok_Body);
  78       Set_Reserved (Name_Case,      Tok_Case);
  79       Set_Reserved (Name_Constant,  Tok_Constant);
  80       Set_Reserved (Name_Declare,   Tok_Declare);
  81       Set_Reserved (Name_Delay,     Tok_Delay);
  82       Set_Reserved (Name_Delta,     Tok_Delta);
  83       Set_Reserved (Name_Digits,    Tok_Digits);
  84       Set_Reserved (Name_Do,        Tok_Do);
  85       Set_Reserved (Name_Else,      Tok_Else);
  86       Set_Reserved (Name_Elsif,     Tok_Elsif);
  87       Set_Reserved (Name_End,       Tok_End);
  88       Set_Reserved (Name_Entry,     Tok_Entry);
  89       Set_Reserved (Name_Exception, Tok_Exception);
  90       Set_Reserved (Name_Exit,      Tok_Exit);
  91       Set_Reserved (Name_For,       Tok_For);
  92       Set_Reserved (Name_Function,  Tok_Function);
  93       Set_Reserved (Name_Generic,   Tok_Generic);
  94       Set_Reserved (Name_Goto,      Tok_Goto);
  95       Set_Reserved (Name_If,        Tok_If);
  96       Set_Reserved (Name_In,        Tok_In);
  97       Set_Reserved (Name_Is,        Tok_Is);
  98       Set_Reserved (Name_Limited,   Tok_Limited);
  99       Set_Reserved (Name_Loop,      Tok_Loop);
 100       Set_Reserved (Name_Mod,       Tok_Mod);
 101       Set_Reserved (Name_New,       Tok_New);
 102       Set_Reserved (Name_Not,       Tok_Not);
 103       Set_Reserved (Name_Null,      Tok_Null);
 104       Set_Reserved (Name_Of,        Tok_Of);
 105       Set_Reserved (Name_Or,        Tok_Or);
 106       Set_Reserved (Name_Others,    Tok_Others);
 107       Set_Reserved (Name_Out,       Tok_Out);
 108       Set_Reserved (Name_Package,   Tok_Package);
 109       Set_Reserved (Name_Pragma,    Tok_Pragma);
 110       Set_Reserved (Name_Private,   Tok_Private);
 111       Set_Reserved (Name_Procedure, Tok_Procedure);
 112       Set_Reserved (Name_Protected, Tok_Protected);
 113       Set_Reserved (Name_Raise,     Tok_Raise);
 114       Set_Reserved (Name_Range,     Tok_Range);
 115       Set_Reserved (Name_Record,    Tok_Record);
 116       Set_Reserved (Name_Rem,       Tok_Rem);
 117       Set_Reserved (Name_Renames,   Tok_Renames);
 118       Set_Reserved (Name_Requeue,   Tok_Requeue);
 119       Set_Reserved (Name_Return,    Tok_Return);
 120       Set_Reserved (Name_Reverse,   Tok_Reverse);
 121       Set_Reserved (Name_Select,    Tok_Select);
 122       Set_Reserved (Name_Separate,  Tok_Separate);
 123       Set_Reserved (Name_Subtype,   Tok_Subtype);
 124       Set_Reserved (Name_Tagged,    Tok_Tagged);
 125       Set_Reserved (Name_Task,      Tok_Task);
 126       Set_Reserved (Name_Terminate, Tok_Terminate);
 127       Set_Reserved (Name_Then,      Tok_Then);
 128       Set_Reserved (Name_Type,      Tok_Type);
 129       Set_Reserved (Name_Until,     Tok_Until);
 130       Set_Reserved (Name_Use,       Tok_Use);
 131       Set_Reserved (Name_When,      Tok_When);
 132       Set_Reserved (Name_While,     Tok_While);
 133       Set_Reserved (Name_With,      Tok_With);
 134       Set_Reserved (Name_Xor,       Tok_Xor);
 135
 136       --  Ada 2005 reserved words
 137
 138       Set_Reserved (Name_Interface,     Tok_Interface);
 139       Set_Reserved (Name_Overriding,    Tok_Overriding);
 140       Set_Reserved (Name_Synchronized,  Tok_Synchronized);
 141
 142    end Initialize_Ada_Keywords;
 143
 144    ------------------------
 145    -- Restore_Scan_State --
 146    ------------------------
 147
 148    procedure Restore_Scan_State (Saved_State : Saved_Scan_State) is
 149    begin
 150       Scan_Ptr                 := Saved_State.Save_Scan_Ptr;
 151       Token                    := Saved_State.Save_Token;
 152       Token_Ptr                := Saved_State.Save_Token_Ptr;
 153       Current_Line_Start       := Saved_State.Save_Current_Line_Start;
 154       Start_Column             := Saved_State.Save_Start_Column;
 155       Checksum                 := Saved_State.Save_Checksum;
 156       First_Non_Blank_Location := Saved_State.Save_First_Non_Blank_Location;
 157       Token_Node               := Saved_State.Save_Token_Node;
 158       Token_Name               := Saved_State.Save_Token_Name;
 159       Prev_Token               := Saved_State.Save_Prev_Token;
 160       Prev_Token_Ptr           := Saved_State.Save_Prev_Token_Ptr;
 161    end Restore_Scan_State;
 162
 163    ---------------------
 164    -- Save_Scan_State --
 165    ---------------------
 166
 167    procedure Save_Scan_State (Saved_State : out Saved_Scan_State) is
 168    begin
 169       Saved_State.Save_Scan_Ptr                 := Scan_Ptr;
 170       Saved_State.Save_Token                    := Token;
 171       Saved_State.Save_Token_Ptr                := Token_Ptr;
 172       Saved_State.Save_Current_Line_Start       := Current_Line_Start;
 173       Saved_State.Save_Start_Column             := Start_Column;
 174       Saved_State.Save_Checksum                 := Checksum;
 175       Saved_State.Save_First_Non_Blank_Location := First_Non_Blank_Location;
 176       Saved_State.Save_Token_Node               := Token_Node;
 177       Saved_State.Save_Token_Name               := Token_Name;
 178       Saved_State.Save_Prev_Token               := Prev_Token;
 179       Saved_State.Save_Prev_Token_Ptr           := Prev_Token_Ptr;
 180    end Save_Scan_State;
 181
 182 end Scans;