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------------------------------------------------------------------------------ -- -- -- GNAT COMPILER COMPONENTS -- -- -- -- S C N -- -- -- -- B o d y -- -- -- -- Copyright (C) 1992-2012, 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 Csets; use Csets; with Hostparm; use Hostparm; with Namet; use Namet; with Opt; use Opt; with Restrict; use Restrict; with Rident; use Rident; with Scans; use Scans; with Sinfo; use Sinfo; with Sinput; use Sinput; with Uintp; use Uintp; package body Scn is use ASCII; Used_As_Identifier : array (Token_Type) of Boolean; -- Flags set True if a given keyword is used as an identifier (used to -- make sure that we only post an error message for incorrect use of a -- keyword as an identifier once for a given keyword). procedure Check_End_Of_Line; -- Called when end of line encountered. Checks that line is not too long, -- and that other style checks for the end of line are met. function Determine_License return License_Type; -- Scan header of file and check that it has an appropriate GNAT-style -- header with a proper license statement. Returns GPL, Unrestricted, -- or Modified_GPL depending on header. If none of these, returns Unknown. procedure Error_Long_Line; -- Signal error of excessively long line ----------------------- -- Check_End_Of_Line -- ----------------------- procedure Check_End_Of_Line is Len : constant Int := Int (Scan_Ptr) - Int (Current_Line_Start); begin if Style_Check then Style.Check_Line_Terminator (Len); elsif Len > Max_Line_Length then Error_Long_Line; end if; end Check_End_Of_Line; ----------------------- -- Determine_License -- ----------------------- function Determine_License return License_Type is GPL_Found : Boolean := False; Result : License_Type; function Contains (S : String) return Boolean; -- See if current comment contains successive non-blank characters -- matching the contents of S. If so leave Scan_Ptr unchanged and -- return True, otherwise leave Scan_Ptr unchanged and return False. procedure Skip_EOL; -- Skip to line terminator character -------------- -- Contains -- -------------- function Contains (S : String) return Boolean is CP : Natural; SP : Source_Ptr; SS : Source_Ptr; begin -- Loop to check characters. This loop is terminated by end of -- line, and also we need to check for the EOF case, to take -- care of files containing only comments. SP := Scan_Ptr; while Source (SP) /= CR and then Source (SP) /= LF and then Source (SP) /= EOF loop if Source (SP) = S (S'First) then SS := SP; CP := S'First; loop SS := SS + 1; CP := CP + 1; if CP > S'Last then return True; end if; while Source (SS) = ' ' loop SS := SS + 1; end loop; exit when Source (SS) /= S (CP); end loop; end if; SP := SP + 1; end loop; return False; end Contains; -------------- -- Skip_EOL -- -------------- procedure Skip_EOL is begin while Source (Scan_Ptr) /= CR and then Source (Scan_Ptr) /= LF and then Source (Scan_Ptr) /= EOF loop Scan_Ptr := Scan_Ptr + 1; end loop; end Skip_EOL; -- Start of processing for Determine_License begin loop if Source (Scan_Ptr) /= '-' or else Source (Scan_Ptr + 1) /= '-' then if GPL_Found then Result := GPL; exit; else Result := Unknown; exit; end if; elsif Contains ("Asaspecialexception") then if GPL_Found then Result := Modified_GPL; exit; end if; elsif Contains ("GNUGeneralPublicLicense") then GPL_Found := True; elsif Contains ("ThisspecificationisadaptedfromtheAdaSemanticInterface") or else Contains ("ThisspecificationisderivedfromtheAdaReferenceManual") then Result := Unrestricted; exit; end if; Skip_EOL; Check_End_Of_Line; if Source (Scan_Ptr) /= EOF then -- We have to take into account a degenerate case when the source -- file contains only comments and no Ada code. declare Physical : Boolean; begin Skip_Line_Terminators (Scan_Ptr, Physical); -- If we are at start of physical line, update scan pointers -- to reflect the start of the new line. if Physical then Current_Line_Start := Scan_Ptr; Start_Column := Scanner.Set_Start_Column; First_Non_Blank_Location := Scan_Ptr; end if; end; end if; end loop; return Result; end Determine_License; ---------------------------- -- Determine_Token_Casing -- ---------------------------- function Determine_Token_Casing return Casing_Type is begin return Scanner.Determine_Token_Casing; end Determine_Token_Casing; --------------------- -- Error_Long_Line -- --------------------- procedure Error_Long_Line is begin Error_Msg ("this line is too long", Current_Line_Start + Source_Ptr (Max_Line_Length)); end Error_Long_Line; ------------------------ -- Initialize_Scanner -- ------------------------ procedure Initialize_Scanner (Unit : Unit_Number_Type; Index : Source_File_Index) is GNAT_Hedr : constant Text_Buffer (1 .. 78) := (others => '-'); begin Scanner.Initialize_Scanner (Index); if Index /= Internal_Source_File then Set_Unit (Index, Unit); end if; Current_Source_Unit := Unit; -- Set default for Comes_From_Source (except if we are going to process -- an artificial string internally created within the compiler and -- placed into internal source duffer). All nodes built now until we -- reenter the analyzer will have Comes_From_Source set to True if Index /= Internal_Source_File then Set_Comes_From_Source_Default (True); end if; -- Check license if GNAT type header possibly present if Source_Last (Index) - Scan_Ptr > 80 and then Source (Scan_Ptr .. Scan_Ptr + 77) = GNAT_Hedr then Set_License (Current_Source_File, Determine_License); end if; Check_For_BOM; -- Because of the License stuff above, Scng.Initialize_Scanner cannot -- call Scan. Scan initial token (note this initializes Prev_Token, -- Prev_Token_Ptr). -- There are two reasons not to do the Scan step in case if we -- initialize the scanner for the internal source buffer: -- - The artificial string may not be created by the compiler in this -- buffer when we call Initialize_Scanner -- - For these artificial strings a special way of scanning is used, so -- the standard step of the scanner may just break the algorithm of -- processing these strings. if Index /= Internal_Source_File then Scan; end if; -- Clear flags for reserved words used as identifiers for J in Token_Type loop Used_As_Identifier (J) := False; end loop; end Initialize_Scanner; --------------- -- Post_Scan -- --------------- procedure Post_Scan is procedure Check_Obsolescent_Features_Restriction (S : Source_Ptr); -- This checks for Obsolescent_Features restriction being active, and -- if so, flags the restriction as occurring at the given scan location. procedure Check_Obsolete_Base_Char; -- Check for numeric literal using ':' instead of '#' for based case -------------------------------------------- -- Check_Obsolescent_Features_Restriction -- -------------------------------------------- procedure Check_Obsolescent_Features_Restriction (S : Source_Ptr) is begin -- Normally we have a node handy for posting restrictions. We don't -- have such a node here, so construct a dummy one with the right -- scan pointer. This is only used to get the Sloc value anyway. Check_Restriction (No_Obsolescent_Features, New_Node (N_Empty, S)); end Check_Obsolescent_Features_Restriction; ------------------------------ -- Check_Obsolete_Base_Char -- ------------------------------ procedure Check_Obsolete_Base_Char is S : Source_Ptr; begin if Based_Literal_Uses_Colon then -- Find the : for the restriction or warning message S := Token_Ptr; while Source (S) /= ':' loop S := S + 1; end loop; Check_Obsolescent_Features_Restriction (S); if Warn_On_Obsolescent_Feature then Error_Msg ("use of "":"" is an obsolescent feature (RM J.2(3))?", S); Error_Msg ("\use ""'#"" instead?", S); end if; end if; end Check_Obsolete_Base_Char; -- Start of processing for Post_Scan begin case Token is when Tok_Char_Literal => Token_Node := New_Node (N_Character_Literal, Token_Ptr); Set_Char_Literal_Value (Token_Node, UI_From_CC (Character_Code)); Set_Chars (Token_Node, Token_Name); when Tok_Identifier => Token_Node := New_Node (N_Identifier, Token_Ptr); Set_Chars (Token_Node, Token_Name); when Tok_Real_Literal => Token_Node := New_Node (N_Real_Literal, Token_Ptr); Set_Realval (Token_Node, Real_Literal_Value); Check_Obsolete_Base_Char; when Tok_Integer_Literal => Token_Node := New_Node (N_Integer_Literal, Token_Ptr); Set_Intval (Token_Node, Int_Literal_Value); Check_Obsolete_Base_Char; when Tok_String_Literal => Token_Node := New_Node (N_String_Literal, Token_Ptr); Set_Has_Wide_Character (Token_Node, Wide_Character_Found); Set_Has_Wide_Wide_Character (Token_Node, Wide_Wide_Character_Found); Set_Strval (Token_Node, String_Literal_Id); if Source (Token_Ptr) = '%' then Check_Obsolescent_Features_Restriction (Token_Ptr); if Warn_On_Obsolescent_Feature then Error_Msg_SC ("use of ""'%"" is an obsolescent feature (RM J.2(4))?"); Error_Msg_SC ("\use """""" instead?"); end if; end if; when Tok_Operator_Symbol => Token_Node := New_Node (N_Operator_Symbol, Token_Ptr); Set_Chars (Token_Node, Token_Name); Set_Strval (Token_Node, String_Literal_Id); when Tok_Vertical_Bar => if Source (Token_Ptr) = '!' then Check_Obsolescent_Features_Restriction (Token_Ptr); if Warn_On_Obsolescent_Feature then Error_Msg_SC ("use of ""'!"" is an obsolescent feature (RM J.2(2))?"); Error_Msg_SC ("\use ""'|"" instead?"); end if; end if; when others => null; end case; end Post_Scan; ------------------------------ -- Scan_Reserved_Identifier -- ------------------------------ procedure Scan_Reserved_Identifier (Force_Msg : Boolean) is Token_Chars : constant String := Token_Type'Image (Token); begin -- We have in Token_Chars the image of the Token name, i.e. Tok_xxx. -- This code extracts the xxx and makes an identifier out of it. Name_Len := 0; for J in 5 .. Token_Chars'Length loop Name_Len := Name_Len + 1; Name_Buffer (Name_Len) := Fold_Lower (Token_Chars (J)); end loop; Token_Name := Name_Find; if not Used_As_Identifier (Token) or else Force_Msg then Error_Msg_Name_1 := Token_Name; Error_Msg_SC ("reserved word* cannot be used as identifier!"); Used_As_Identifier (Token) := True; end if; Token := Tok_Identifier; Token_Node := New_Node (N_Identifier, Token_Ptr); Set_Chars (Token_Node, Token_Name); end Scan_Reserved_Identifier; end Scn;
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