-- --
-- B o d y --
-- --
--- Copyright (C) 1992-2006, Free Software Foundation, Inc. --
+-- Copyright (C) 1992-2020, 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 2, or (at your option) any later ver- --
+-- 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 COPYING. If not, write --
--- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
--- Boston, MA 02110-1301, USA. --
+-- 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;
-- 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
-
- ---------------
- -- Post_Scan --
- ---------------
-
- procedure Post_Scan is
- 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);
-
- when Tok_Integer_Literal =>
- Token_Node := New_Node (N_Integer_Literal, Token_Ptr);
- Set_Intval (Token_Node, Int_Literal_Value);
-
- when Tok_String_Literal =>
- Token_Node := New_Node (N_String_Literal, Token_Ptr);
- Set_Has_Wide_Character (Token_Node, Wide_Character_Found);
- Set_Strval (Token_Node, String_Literal_Id);
-
- 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 others =>
- null;
- end case;
- end Post_Scan;
-
- -----------------------
- -- 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 --
-----------------------
Skip_EOL;
- Check_End_Of_Line;
+ Scanner.Check_End_Of_Line;
if Source (Scan_Ptr) /= EOF then
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 --
------------------------
begin
Scanner.Initialize_Scanner (Index);
-
- if Index /= Internal_Source_File then
- Set_Unit (Index, Unit);
- end if;
+ Set_Unit (Index, Unit);
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
+ -- Set default for Comes_From_Source. 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;
+ Set_Comes_From_Source_Default (True);
-- Check license if GNAT type header possibly present
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:
+ Scan;
- -- - The artificial string may not be created by the compiler in this
- -- buffer when we call Initialize_Scanner
+ -- Clear flags for reserved words used as identifiers
- -- - 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.
+ Used_As_Identifier := (others => False);
+ end Initialize_Scanner;
- if Index /= Internal_Source_File then
- Scan;
- end if;
+ ---------------
+ -- Post_Scan --
+ ---------------
- -- Clear flags for reserved words used as indentifiers
+ 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.
- for J in Token_Type loop
- Used_As_Identifier (J) := False;
- end loop;
- end Initialize_Scanner;
+ procedure Check_Obsolete_Base_Char;
+ -- Check for numeric literal using ':' instead of '#' for based case
- -----------------------
- -- Obsolescent_Check --
- -----------------------
+ --------------------------------------------
+ -- 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
+ ("?j?use of "":"" is an obsolescent feature (RM J.2(3))", S);
+ Error_Msg
+ ("\?j?use ""'#"" instead", S);
+ end if;
+ end if;
+ end Check_Obsolete_Base_Char;
+
+ -- Start of processing for Post_Scan
- procedure Obsolescent_Check (S : Source_Ptr) is
begin
- -- This is a pain in the neck case, since we normally need a node to
- -- call Check_Restrictions, and all we have is a source pointer. The
- -- easiest thing is to construct a dummy node. A bit kludgy, but this
- -- is a marginal case. It's not worth trying to do things more cleanly.
+ 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
+ ("?j?use of ""'%"" is an obsolescent feature (RM J.2(4))");
+ Error_Msg_SC ("\?j?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);
- Check_Restriction (No_Obsolescent_Features, New_Node (N_Empty, S));
- end Obsolescent_Check;
+ if Warn_On_Obsolescent_Feature then
+ Error_Msg_SC
+ ("?j?use of ""'!"" is an obsolescent feature (RM J.2(2))");
+ Error_Msg_SC ("\?j?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);
+ Token_Chars : String := Token_Type'Image (Token);
+ Len : Natural := 0;
begin
+ -- AI12-0125 : '@' denotes the target_name, i.e. serves as an
+ -- abbreviation for the LHS of an assignment.
+
+ if Token = Tok_At_Sign then
+ Token_Node := New_Node (N_Target_Name, Token_Ptr);
+ return;
+ end if;
+
-- 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));
+ Len := Len + 1;
+ Token_Chars (Len) := Fold_Lower (Token_Chars (J));
end loop;
- Token_Name := Name_Find;
+ Token_Name := Name_Find (Token_Chars (1 .. Len));
+
+ -- If Inside_Pragma is True, we don't give an error. This is to allow
+ -- things like "pragma Ignore_Pragma (Interface)", where "Interface" is
+ -- a reserved word. There is no danger of missing errors, because any
+ -- misuse must have been preceded by an illegal declaration. For
+ -- example, in "pragma Pack (Begin);", either Begin is not declared,
+ -- which is an error, or it is declared, which will be an error on that
+ -- declaration.
- if not Used_As_Identifier (Token) or else Force_Msg then
+ if (not Used_As_Identifier (Token) or else Force_Msg)
+ and then not Inside_Pragma
+ then
Error_Msg_Name_1 := Token_Name;
Error_Msg_SC ("reserved word* cannot be used as identifier!");
Used_As_Identifier (Token) := True;
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