1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2011, 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 Debug; use Debug;
27 with Binderr; use Binderr;
29 with Output; use Output;
30 with Osint; use Osint;
31 with Scans; use Scans;
34 with Snames; use Snames;
37 package body ALI.Util is
39 -- Empty procedures needed to instantiate Scng. Error procedures are
40 -- empty, because we don't want to report any errors when computing
45 procedure Error_Msg (Msg : String; Flag_Location : Source_Ptr);
47 procedure Error_Msg_S (Msg : String);
49 procedure Error_Msg_SC (Msg : String);
51 procedure Error_Msg_SP (Msg : String);
53 -- Instantiation of Styleg, needed to instantiate Scng
55 package Style is new Styleg
56 (Error_Msg, Error_Msg_S, Error_Msg_SC, Error_Msg_SP);
58 -- A Scanner is needed to get checksum of a source (procedure
59 -- Get_File_Checksum).
61 package Scanner is new Scng
62 (Post_Scan, Error_Msg, Error_Msg_S, Error_Msg_SC, Error_Msg_SP, Style);
64 type Header_Num is range 0 .. 1_000;
66 function Hash (F : File_Name_Type) return Header_Num;
67 -- Function used to compute hash of ALI file name
69 package Interfaces is new Simple_HTable (
70 Header_Num => Header_Num,
73 Key => File_Name_Type,
81 function Checksums_Match (Checksum1, Checksum2 : Word) return Boolean is
83 return Checksum1 = Checksum2 and then Checksum1 /= Checksum_Error;
90 procedure Error_Msg (Msg : String; Flag_Location : Source_Ptr) is
91 pragma Warnings (Off, Msg);
92 pragma Warnings (Off, Flag_Location);
101 procedure Error_Msg_S (Msg : String) is
102 pragma Warnings (Off, Msg);
111 procedure Error_Msg_SC (Msg : String) is
112 pragma Warnings (Off, Msg);
121 procedure Error_Msg_SP (Msg : String) is
122 pragma Warnings (Off, Msg);
127 -----------------------
128 -- Get_File_Checksum --
129 -----------------------
131 function Get_File_Checksum (Fname : File_Name_Type) return Word is
132 Full_Name : File_Name_Type;
133 Source_Index : Source_File_Index;
136 Full_Name := Find_File (Fname, Osint.Source);
138 -- If we cannot find the file, then return an impossible checksum,
139 -- impossible because checksums have the high order bit zero, so
140 -- that checksums do not match.
142 if Full_Name = No_File then
143 return Checksum_Error;
146 Source_Index := Sinput.C.Load_File (Get_Name_String (Full_Name));
148 if Source_Index = No_Source_File then
149 return Checksum_Error;
152 Scanner.Initialize_Scanner (Source_Index);
154 -- Make sure that the project language reserved words are not
155 -- recognized as reserved words, but as identifiers. The byte info for
156 -- those names have been set if we are in gnatmake.
158 Set_Name_Table_Byte (Name_Project, 0);
159 Set_Name_Table_Byte (Name_Extends, 0);
160 Set_Name_Table_Byte (Name_External, 0);
161 Set_Name_Table_Byte (Name_External_As_List, 0);
163 -- Scan the complete file to compute its checksum
167 exit when Token = Tok_EOF;
170 return Scans.Checksum;
171 end Get_File_Checksum;
177 function Hash (F : File_Name_Type) return Header_Num is
179 return Header_Num (Int (F) rem Header_Num'Range_Length);
182 ---------------------------
183 -- Initialize_ALI_Source --
184 ---------------------------
186 procedure Initialize_ALI_Source is
188 -- When (re)initializing ALI data structures the ALI user expects to
189 -- get a fresh set of data structures. Thus we first need to erase the
190 -- marks put in the name table by the previous set of ALI routine calls.
191 -- This loop is empty and harmless the first time in.
193 for J in Source.First .. Source.Last loop
194 Set_Name_Table_Info (Source.Table (J).Sfile, 0);
195 Source.Table (J).Source_Found := False;
200 end Initialize_ALI_Source;
206 procedure Post_Scan is
211 ----------------------
212 -- Read_Withed_ALIs --
213 ----------------------
215 procedure Read_Withed_ALIs
217 Ignore_Errors : Boolean := False)
219 Afile : File_Name_Type;
220 Text : Text_Buffer_Ptr;
224 -- Process all dependent units
226 for U in ALIs.Table (Id).First_Unit .. ALIs.Table (Id).Last_Unit loop
228 W in Units.Table (U).First_With .. Units.Table (U).Last_With
230 Afile := Withs.Table (W).Afile;
232 -- Only process if not a generic (Afile /= No_File) and if
233 -- file has not been processed already.
236 and then Get_Name_Table_Info (Afile) = 0
238 Text := Read_Library_Info (Afile);
240 -- Unless Ignore_Errors is true, return with an error if source
241 -- cannot be found. We used to skip this check when we did not
242 -- compile library generics separately, but we now always do,
243 -- so there is no special case here anymore.
247 if not Ignore_Errors then
248 Error_Msg_File_1 := Afile;
249 Error_Msg_File_2 := Withs.Table (W).Sfile;
250 Error_Msg ("{ not found, { must be compiled");
251 Set_Name_Table_Info (Afile, Int (No_Unit_Id));
256 -- Enter in ALIs table
267 if ALIs.Table (Idread).Compile_Errors
268 and then not Ignore_Errors
270 Error_Msg_File_1 := Withs.Table (W).Sfile;
271 Error_Msg ("{ had errors, must be fixed, and recompiled");
272 Set_Name_Table_Info (Afile, Int (No_Unit_Id));
274 elsif ALIs.Table (Idread).No_Object
275 and then not Ignore_Errors
277 Error_Msg_File_1 := Withs.Table (W).Sfile;
278 Error_Msg ("{ must be recompiled");
279 Set_Name_Table_Info (Afile, Int (No_Unit_Id));
282 -- If the Unit is an Interface to a Stand-Alone Library,
283 -- set the Interface flag in the Withs table, so that its
284 -- dependant are not considered for elaboration order.
286 if ALIs.Table (Idread).SAL_Interface then
287 Withs.Table (W).SAL_Interface := True;
288 Interface_Library_Unit := True;
290 -- Set the entry in the Interfaces hash table, so that
291 -- other units that import this unit will set the flag
292 -- in their entry in the Withs table.
294 Interfaces.Set (Afile, True);
297 -- Otherwise, recurse to get new dependents
299 Read_Withed_ALIs (Idread);
303 -- If the ALI file has already been processed and is an interface,
304 -- set the flag in the entry of the Withs table.
306 elsif Interface_Library_Unit and then Interfaces.Get (Afile) then
307 Withs.Table (W).SAL_Interface := True;
311 end Read_Withed_ALIs;
313 ----------------------
314 -- Set_Source_Table --
315 ----------------------
317 procedure Set_Source_Table (A : ALI_Id) is
320 Stamp : Time_Stamp_Type;
324 ALIs.Table (A).First_Sdep .. ALIs.Table (A).Last_Sdep
326 F := Sdep.Table (D).Sfile;
330 -- If this is the first time we are seeing this source file,
331 -- then make a new entry in the source table.
333 if Get_Name_Table_Info (F) = 0 then
334 Source.Increment_Last;
336 Set_Name_Table_Info (F, Int (S));
337 Source.Table (S).Sfile := F;
338 Source.Table (S).All_Timestamps_Match := True;
340 -- Initialize checksum fields
342 Source.Table (S).Checksum := Sdep.Table (D).Checksum;
343 Source.Table (S).All_Checksums_Match := True;
345 -- In check source files mode, try to get time stamp from file
347 if Opt.Check_Source_Files then
348 Stamp := Source_File_Stamp (F);
350 -- If we got the stamp, then set the stamp in the source
351 -- table entry and mark it as set from the source so that
352 -- it does not get subsequently changed.
354 if Stamp (Stamp'First) /= ' ' then
355 Source.Table (S).Stamp := Stamp;
356 Source.Table (S).Source_Found := True;
358 -- If we could not find the file, then the stamp is set
359 -- from the dependency table entry (to be possibly reset
360 -- if we find a later stamp in subsequent processing)
363 Source.Table (S).Stamp := Sdep.Table (D).Stamp;
364 Source.Table (S).Source_Found := False;
366 -- In All_Sources mode, flag error of file not found
368 if Opt.All_Sources then
369 Error_Msg_File_1 := F;
370 Error_Msg ("cannot locate {");
374 -- First time for this source file, but Check_Source_Files
375 -- is off, so simply initialize the stamp from the Sdep entry
378 Source.Table (S).Source_Found := False;
379 Source.Table (S).Stamp := Sdep.Table (D).Stamp;
382 -- Here if this is not the first time for this source file,
383 -- so that the source table entry is already constructed.
386 S := Source_Id (Get_Name_Table_Info (F));
388 -- Update checksum flag
390 if not Checksums_Match
391 (Sdep.Table (D).Checksum, Source.Table (S).Checksum)
393 Source.Table (S).All_Checksums_Match := False;
396 -- Check for time stamp mismatch
398 if Sdep.Table (D).Stamp /= Source.Table (S).Stamp then
399 Source.Table (S).All_Timestamps_Match := False;
401 -- When we have a time stamp mismatch, we go look for the
402 -- source file even if Check_Source_Files is false, since
403 -- if we find it, then we can use it to resolve which of the
404 -- two timestamps in the ALI files is likely to be correct.
406 if not Check_Source_Files then
407 Stamp := Source_File_Stamp (F);
409 if Stamp (Stamp'First) /= ' ' then
410 Source.Table (S).Stamp := Stamp;
411 Source.Table (S).Source_Found := True;
415 -- If the stamp in the source table entry was set from the
416 -- source file, then we do not change it (the stamp in the
417 -- source file is always taken as the "right" one).
419 if Source.Table (S).Source_Found then
422 -- Otherwise, we have no source file available, so we guess
423 -- that the later of the two timestamps is the right one.
424 -- Note that this guess only affects which error messages
425 -- are issued later on, not correct functionality.
428 if Sdep.Table (D).Stamp > Source.Table (S).Stamp then
429 Source.Table (S).Stamp := Sdep.Table (D).Stamp;
435 -- Set the checksum value in the source table
437 S := Source_Id (Get_Name_Table_Info (F));
438 Source.Table (S).Checksum := Sdep.Table (D).Checksum;
442 end Set_Source_Table;
444 ----------------------
445 -- Set_Source_Table --
446 ----------------------
448 procedure Set_Source_Table is
450 for A in ALIs.First .. ALIs.Last loop
451 Set_Source_Table (A);
453 end Set_Source_Table;
455 -------------------------
456 -- Time_Stamp_Mismatch --
457 -------------------------
459 function Time_Stamp_Mismatch
461 Read_Only : Boolean := False) return File_Name_Type
464 -- Source file Id for the current Sdep entry
467 for D in ALIs.Table (A).First_Sdep .. ALIs.Table (A).Last_Sdep loop
468 Src := Source_Id (Get_Name_Table_Info (Sdep.Table (D).Sfile));
470 if Opt.Minimal_Recompilation
471 and then Sdep.Table (D).Stamp /= Source.Table (Src).Stamp
473 -- If minimal recompilation is in action, replace the stamp
474 -- of the source file in the table if checksums match.
476 -- ??? It is probably worth updating the ALI file with a new
477 -- field to avoid recomputing it each time.
480 (Get_File_Checksum (Sdep.Table (D).Sfile),
481 Source.Table (Src).Checksum)
485 Write_Str (Get_Name_String (Sdep.Table (D).Sfile));
486 Write_Str (": up to date, different timestamps " &
487 "but same checksum");
491 Sdep.Table (D).Stamp := Source.Table (Src).Stamp;
496 if (not Read_Only) or else Source.Table (Src).Source_Found then
497 if not Source.Table (Src).Source_Found
498 or else Sdep.Table (D).Stamp /= Source.Table (Src).Stamp
500 -- If -dt debug flag set, output time stamp found/expected
502 if Source.Table (Src).Source_Found and then Debug_Flag_T then
503 Write_Str ("Source: """);
504 Get_Name_String (Sdep.Table (D).Sfile);
505 Write_Str (Name_Buffer (1 .. Name_Len));
508 Write_Str (" time stamp expected: ");
509 Write_Line (String (Sdep.Table (D).Stamp));
511 Write_Str (" time stamp found: ");
512 Write_Line (String (Source.Table (Src).Stamp));
515 -- Return the source file
517 return Source.Table (Src).Sfile;
523 end Time_Stamp_Mismatch;