1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2012, Free Software Foundation, Inc. --
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. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree; use Atree;
27 with Csets; use Csets;
28 with Hostparm; use Hostparm;
29 with Namet; use Namet;
31 with Restrict; use Restrict;
32 with Rident; use Rident;
33 with Scans; use Scans;
34 with Sinfo; use Sinfo;
35 with Sinput; use Sinput;
36 with Uintp; use Uintp;
42 Used_As_Identifier : array (Token_Type) of Boolean;
43 -- Flags set True if a given keyword is used as an identifier (used to
44 -- make sure that we only post an error message for incorrect use of a
45 -- keyword as an identifier once for a given keyword).
47 procedure Check_End_Of_Line;
48 -- Called when end of line encountered. Checks that line is not too long,
49 -- and that other style checks for the end of line are met.
51 function Determine_License return License_Type;
52 -- Scan header of file and check that it has an appropriate GNAT-style
53 -- header with a proper license statement. Returns GPL, Unrestricted,
54 -- or Modified_GPL depending on header. If none of these, returns Unknown.
56 procedure Error_Long_Line;
57 -- Signal error of excessively long line
59 -----------------------
60 -- Check_End_Of_Line --
61 -----------------------
63 procedure Check_End_Of_Line is
64 Len : constant Int := Int (Scan_Ptr) - Int (Current_Line_Start);
67 Style.Check_Line_Terminator (Len);
68 elsif Len > Max_Line_Length then
71 end Check_End_Of_Line;
73 -----------------------
74 -- Determine_License --
75 -----------------------
77 function Determine_License return License_Type is
78 GPL_Found : Boolean := False;
79 Result : License_Type;
81 function Contains (S : String) return Boolean;
82 -- See if current comment contains successive non-blank characters
83 -- matching the contents of S. If so leave Scan_Ptr unchanged and
84 -- return True, otherwise leave Scan_Ptr unchanged and return False.
87 -- Skip to line terminator character
93 function Contains (S : String) return Boolean is
99 -- Loop to check characters. This loop is terminated by end of
100 -- line, and also we need to check for the EOF case, to take
101 -- care of files containing only comments.
104 while Source (SP) /= CR and then
105 Source (SP) /= LF and then
108 if Source (SP) = S (S'First) then
120 while Source (SS) = ' ' loop
124 exit when Source (SS) /= S (CP);
138 procedure Skip_EOL is
140 while Source (Scan_Ptr) /= CR
141 and then Source (Scan_Ptr) /= LF
142 and then Source (Scan_Ptr) /= EOF
144 Scan_Ptr := Scan_Ptr + 1;
148 -- Start of processing for Determine_License
152 if Source (Scan_Ptr) /= '-'
153 or else Source (Scan_Ptr + 1) /= '-'
163 elsif Contains ("Asaspecialexception") then
165 Result := Modified_GPL;
169 elsif Contains ("GNUGeneralPublicLicense") then
174 ("ThisspecificationisadaptedfromtheAdaSemanticInterface")
177 ("ThisspecificationisderivedfromtheAdaReferenceManual")
179 Result := Unrestricted;
187 if Source (Scan_Ptr) /= EOF then
189 -- We have to take into account a degenerate case when the source
190 -- file contains only comments and no Ada code.
196 Skip_Line_Terminators (Scan_Ptr, Physical);
198 -- If we are at start of physical line, update scan pointers
199 -- to reflect the start of the new line.
202 Current_Line_Start := Scan_Ptr;
203 Start_Column := Scanner.Set_Start_Column;
204 First_Non_Blank_Location := Scan_Ptr;
211 end Determine_License;
213 ----------------------------
214 -- Determine_Token_Casing --
215 ----------------------------
217 function Determine_Token_Casing return Casing_Type is
219 return Scanner.Determine_Token_Casing;
220 end Determine_Token_Casing;
222 ---------------------
223 -- Error_Long_Line --
224 ---------------------
226 procedure Error_Long_Line is
229 ("this line is too long",
230 Current_Line_Start + Source_Ptr (Max_Line_Length));
233 ------------------------
234 -- Initialize_Scanner --
235 ------------------------
237 procedure Initialize_Scanner
238 (Unit : Unit_Number_Type;
239 Index : Source_File_Index)
241 GNAT_Hedr : constant Text_Buffer (1 .. 78) := (others => '-');
244 Scanner.Initialize_Scanner (Index);
246 if Index /= Internal_Source_File then
247 Set_Unit (Index, Unit);
250 Current_Source_Unit := Unit;
252 -- Set default for Comes_From_Source (except if we are going to process
253 -- an artificial string internally created within the compiler and
254 -- placed into internal source duffer). All nodes built now until we
255 -- reenter the analyzer will have Comes_From_Source set to True
257 if Index /= Internal_Source_File then
258 Set_Comes_From_Source_Default (True);
261 -- Check license if GNAT type header possibly present
263 if Source_Last (Index) - Scan_Ptr > 80
264 and then Source (Scan_Ptr .. Scan_Ptr + 77) = GNAT_Hedr
266 Set_License (Current_Source_File, Determine_License);
271 -- Because of the License stuff above, Scng.Initialize_Scanner cannot
272 -- call Scan. Scan initial token (note this initializes Prev_Token,
275 -- There are two reasons not to do the Scan step in case if we
276 -- initialize the scanner for the internal source buffer:
278 -- - The artificial string may not be created by the compiler in this
279 -- buffer when we call Initialize_Scanner
281 -- - For these artificial strings a special way of scanning is used, so
282 -- the standard step of the scanner may just break the algorithm of
283 -- processing these strings.
285 if Index /= Internal_Source_File then
289 -- Clear flags for reserved words used as identifiers
291 for J in Token_Type loop
292 Used_As_Identifier (J) := False;
294 end Initialize_Scanner;
300 procedure Post_Scan is
301 procedure Check_Obsolescent_Features_Restriction (S : Source_Ptr);
302 -- This checks for Obsolescent_Features restriction being active, and
303 -- if so, flags the restriction as occurring at the given scan location.
305 procedure Check_Obsolete_Base_Char;
306 -- Check for numeric literal using ':' instead of '#' for based case
308 --------------------------------------------
309 -- Check_Obsolescent_Features_Restriction --
310 --------------------------------------------
312 procedure Check_Obsolescent_Features_Restriction (S : Source_Ptr) is
314 -- Normally we have a node handy for posting restrictions. We don't
315 -- have such a node here, so construct a dummy one with the right
316 -- scan pointer. This is only used to get the Sloc value anyway.
318 Check_Restriction (No_Obsolescent_Features, New_Node (N_Empty, S));
319 end Check_Obsolescent_Features_Restriction;
321 ------------------------------
322 -- Check_Obsolete_Base_Char --
323 ------------------------------
325 procedure Check_Obsolete_Base_Char is
329 if Based_Literal_Uses_Colon then
331 -- Find the : for the restriction or warning message
334 while Source (S) /= ':' loop
338 Check_Obsolescent_Features_Restriction (S);
340 if Warn_On_Obsolescent_Feature then
342 ("use of "":"" is an obsolescent feature (RM J.2(3))?", S);
344 ("\use ""'#"" instead?", S);
347 end Check_Obsolete_Base_Char;
349 -- Start of processing for Post_Scan
353 when Tok_Char_Literal =>
354 Token_Node := New_Node (N_Character_Literal, Token_Ptr);
355 Set_Char_Literal_Value (Token_Node, UI_From_CC (Character_Code));
356 Set_Chars (Token_Node, Token_Name);
358 when Tok_Identifier =>
359 Token_Node := New_Node (N_Identifier, Token_Ptr);
360 Set_Chars (Token_Node, Token_Name);
362 when Tok_Real_Literal =>
363 Token_Node := New_Node (N_Real_Literal, Token_Ptr);
364 Set_Realval (Token_Node, Real_Literal_Value);
365 Check_Obsolete_Base_Char;
367 when Tok_Integer_Literal =>
368 Token_Node := New_Node (N_Integer_Literal, Token_Ptr);
369 Set_Intval (Token_Node, Int_Literal_Value);
370 Check_Obsolete_Base_Char;
372 when Tok_String_Literal =>
373 Token_Node := New_Node (N_String_Literal, Token_Ptr);
374 Set_Has_Wide_Character
375 (Token_Node, Wide_Character_Found);
376 Set_Has_Wide_Wide_Character
377 (Token_Node, Wide_Wide_Character_Found);
378 Set_Strval (Token_Node, String_Literal_Id);
380 if Source (Token_Ptr) = '%' then
381 Check_Obsolescent_Features_Restriction (Token_Ptr);
383 if Warn_On_Obsolescent_Feature then
385 ("use of ""'%"" is an obsolescent feature (RM J.2(4))?");
386 Error_Msg_SC ("\use """""" instead?");
390 when Tok_Operator_Symbol =>
391 Token_Node := New_Node (N_Operator_Symbol, Token_Ptr);
392 Set_Chars (Token_Node, Token_Name);
393 Set_Strval (Token_Node, String_Literal_Id);
395 when Tok_Vertical_Bar =>
396 if Source (Token_Ptr) = '!' then
397 Check_Obsolescent_Features_Restriction (Token_Ptr);
399 if Warn_On_Obsolescent_Feature then
401 ("use of ""'!"" is an obsolescent feature (RM J.2(2))?");
402 Error_Msg_SC ("\use ""'|"" instead?");
411 ------------------------------
412 -- Scan_Reserved_Identifier --
413 ------------------------------
415 procedure Scan_Reserved_Identifier (Force_Msg : Boolean) is
416 Token_Chars : constant String := Token_Type'Image (Token);
419 -- We have in Token_Chars the image of the Token name, i.e. Tok_xxx.
420 -- This code extracts the xxx and makes an identifier out of it.
424 for J in 5 .. Token_Chars'Length loop
425 Name_Len := Name_Len + 1;
426 Name_Buffer (Name_Len) := Fold_Lower (Token_Chars (J));
429 Token_Name := Name_Find;
431 if not Used_As_Identifier (Token) or else Force_Msg then
432 Error_Msg_Name_1 := Token_Name;
433 Error_Msg_SC ("reserved word* cannot be used as identifier!");
434 Used_As_Identifier (Token) := True;
437 Token := Tok_Identifier;
438 Token_Node := New_Node (N_Identifier, Token_Ptr);
439 Set_Chars (Token_Node, Token_Name);
440 end Scan_Reserved_Identifier;