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 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;
38 package body ALI.Util is
40 -- Empty procedures needed to instantiate Scng. Error procedures are
41 -- empty, because we don't want to report any errors when computing
46 procedure Error_Msg (Msg : String; Flag_Location : Source_Ptr);
48 procedure Error_Msg_S (Msg : String);
50 procedure Error_Msg_SC (Msg : String);
52 procedure Error_Msg_SP (Msg : String);
54 -- Instantiation of Styleg, needed to instantiate Scng
56 package Style is new Styleg
57 (Error_Msg, Error_Msg_S, Error_Msg_SC, Error_Msg_SP);
59 -- A Scanner is needed to get checksum of a source (procedure
60 -- Get_File_Checksum).
62 package Scanner is new Scng
63 (Post_Scan, Error_Msg, Error_Msg_S, Error_Msg_SC, Error_Msg_SP, Style);
65 type Header_Num is range 0 .. 1_000;
67 function Hash (F : File_Name_Type) return Header_Num;
68 -- Function used to compute hash of ALI file name
70 package Interfaces is new Simple_HTable (
71 Header_Num => Header_Num,
74 Key => File_Name_Type,
82 function Checksums_Match (Checksum1, Checksum2 : Word) return Boolean is
84 return Checksum1 = Checksum2 and then Checksum1 /= Checksum_Error;
91 procedure Error_Msg (Msg : String; Flag_Location : Source_Ptr) is
92 pragma Warnings (Off, Msg);
93 pragma Warnings (Off, Flag_Location);
102 procedure Error_Msg_S (Msg : String) is
103 pragma Warnings (Off, Msg);
112 procedure Error_Msg_SC (Msg : String) is
113 pragma Warnings (Off, Msg);
122 procedure Error_Msg_SP (Msg : String) is
123 pragma Warnings (Off, Msg);
128 -----------------------
129 -- Get_File_Checksum --
130 -----------------------
132 function Get_File_Checksum (Fname : File_Name_Type) return Word is
133 Full_Name : File_Name_Type;
134 Source_Index : Source_File_Index;
137 Full_Name := Find_File (Fname, Osint.Source);
139 -- If we cannot find the file, then return an impossible checksum,
140 -- impossible because checksums have the high order bit zero, so
141 -- that checksums do not match.
143 if Full_Name = No_File then
144 return Checksum_Error;
147 Source_Index := Sinput.C.Load_File (Get_Name_String (Full_Name));
149 if Source_Index = No_Source_File then
150 return Checksum_Error;
153 Scanner.Initialize_Scanner (Source_Index);
155 -- Make sure that the project language reserved words are not
156 -- recognized as reserved words, but as identifiers. The byte info for
157 -- those names have been set if we are in gnatmake.
159 Set_Name_Table_Byte (Name_Project, 0);
160 Set_Name_Table_Byte (Name_Extends, 0);
161 Set_Name_Table_Byte (Name_External, 0);
162 Set_Name_Table_Byte (Name_External_As_List, 0);
164 -- Scan the complete file to compute its checksum
168 exit when Token = Tok_EOF;
171 return Scans.Checksum;
172 end Get_File_Checksum;
178 function Hash (F : File_Name_Type) return Header_Num is
180 return Header_Num (Int (F) rem Header_Num'Range_Length);
183 ---------------------------
184 -- Initialize_ALI_Source --
185 ---------------------------
187 procedure Initialize_ALI_Source is
189 -- When (re)initializing ALI data structures the ALI user expects to
190 -- get a fresh set of data structures. Thus we first need to erase the
191 -- marks put in the name table by the previous set of ALI routine calls.
192 -- This loop is empty and harmless the first time in.
194 for J in Source.First .. Source.Last loop
195 Set_Name_Table_Info (Source.Table (J).Sfile, 0);
196 Source.Table (J).Source_Found := False;
201 end Initialize_ALI_Source;
207 procedure Post_Scan is
212 ----------------------
213 -- Read_Withed_ALIs --
214 ----------------------
216 procedure Read_Withed_ALIs
218 Ignore_Errors : Boolean := False)
220 Afile : File_Name_Type;
221 Text : Text_Buffer_Ptr;
225 -- Process all dependent units
227 for U in ALIs.Table (Id).First_Unit .. ALIs.Table (Id).Last_Unit loop
229 W in Units.Table (U).First_With .. Units.Table (U).Last_With
231 Afile := Withs.Table (W).Afile;
233 -- Only process if not a generic (Afile /= No_File) and if
234 -- file has not been processed already.
237 and then Get_Name_Table_Info (Afile) = 0
239 Text := Read_Library_Info (Afile);
241 -- Unless Ignore_Errors is true, return with an error if source
242 -- cannot be found. We used to skip this check when we did not
243 -- compile library generics separately, but we now always do,
244 -- so there is no special case here anymore.
248 if not Ignore_Errors then
249 Error_Msg_File_1 := Afile;
250 Error_Msg_File_2 := Withs.Table (W).Sfile;
251 Error_Msg ("{ not found, { must be compiled");
252 Set_Name_Table_Info (Afile, Int (No_Unit_Id));
257 -- Enter in ALIs table
268 if ALIs.Table (Idread).Compile_Errors
269 and then not Ignore_Errors
271 Error_Msg_File_1 := Withs.Table (W).Sfile;
272 Error_Msg ("{ had errors, must be fixed, and recompiled");
273 Set_Name_Table_Info (Afile, Int (No_Unit_Id));
275 elsif ALIs.Table (Idread).No_Object
276 and then not Ignore_Errors
278 Error_Msg_File_1 := Withs.Table (W).Sfile;
279 Error_Msg ("{ must be recompiled");
280 Set_Name_Table_Info (Afile, Int (No_Unit_Id));
283 -- If the Unit is an Interface to a Stand-Alone Library,
284 -- set the Interface flag in the Withs table, so that its
285 -- dependant are not considered for elaboration order.
287 if ALIs.Table (Idread).SAL_Interface then
288 Withs.Table (W).SAL_Interface := True;
289 Interface_Library_Unit := True;
291 -- Set the entry in the Interfaces hash table, so that
292 -- other units that import this unit will set the flag
293 -- in their entry in the Withs table.
295 Interfaces.Set (Afile, True);
298 -- Otherwise, recurse to get new dependents
300 Read_Withed_ALIs (Idread);
304 -- If the ALI file has already been processed and is an interface,
305 -- set the flag in the entry of the Withs table.
307 elsif Interface_Library_Unit and then Interfaces.Get (Afile) then
308 Withs.Table (W).SAL_Interface := True;
312 end Read_Withed_ALIs;
314 ----------------------
315 -- Set_Source_Table --
316 ----------------------
318 procedure Set_Source_Table (A : ALI_Id) is
321 Stamp : Time_Stamp_Type;
325 ALIs.Table (A).First_Sdep .. ALIs.Table (A).Last_Sdep
327 F := Sdep.Table (D).Sfile;
331 -- If this is the first time we are seeing this source file,
332 -- then make a new entry in the source table.
334 if Get_Name_Table_Info (F) = 0 then
335 Source.Increment_Last;
337 Set_Name_Table_Info (F, Int (S));
338 Source.Table (S).Sfile := F;
339 Source.Table (S).All_Timestamps_Match := True;
341 -- Initialize checksum fields
343 Source.Table (S).Checksum := Sdep.Table (D).Checksum;
344 Source.Table (S).All_Checksums_Match := True;
346 -- In check source files mode, try to get time stamp from file
348 if Opt.Check_Source_Files then
349 Stamp := Source_File_Stamp (F);
351 -- If we got the stamp, then set the stamp in the source
352 -- table entry and mark it as set from the source so that
353 -- it does not get subsequently changed.
355 if Stamp (Stamp'First) /= ' ' then
356 Source.Table (S).Stamp := Stamp;
357 Source.Table (S).Source_Found := True;
359 -- If we could not find the file, then the stamp is set
360 -- from the dependency table entry (to be possibly reset
361 -- if we find a later stamp in subsequent processing)
364 Source.Table (S).Stamp := Sdep.Table (D).Stamp;
365 Source.Table (S).Source_Found := False;
367 -- In All_Sources mode, flag error of file not found
369 if Opt.All_Sources then
370 Error_Msg_File_1 := F;
371 Error_Msg ("cannot locate {");
375 -- First time for this source file, but Check_Source_Files
376 -- is off, so simply initialize the stamp from the Sdep entry
379 Source.Table (S).Source_Found := False;
380 Source.Table (S).Stamp := Sdep.Table (D).Stamp;
383 -- Here if this is not the first time for this source file,
384 -- so that the source table entry is already constructed.
387 S := Source_Id (Get_Name_Table_Info (F));
389 -- Update checksum flag
391 if not Checksums_Match
392 (Sdep.Table (D).Checksum, Source.Table (S).Checksum)
394 Source.Table (S).All_Checksums_Match := False;
397 -- Check for time stamp mismatch
399 if Sdep.Table (D).Stamp /= Source.Table (S).Stamp then
400 Source.Table (S).All_Timestamps_Match := False;
402 -- When we have a time stamp mismatch, we go look for the
403 -- source file even if Check_Source_Files is false, since
404 -- if we find it, then we can use it to resolve which of the
405 -- two timestamps in the ALI files is likely to be correct.
407 if not Check_Source_Files then
408 Stamp := Source_File_Stamp (F);
410 if Stamp (Stamp'First) /= ' ' then
411 Source.Table (S).Stamp := Stamp;
412 Source.Table (S).Source_Found := True;
416 -- If the stamp in the source table entry was set from the
417 -- source file, then we do not change it (the stamp in the
418 -- source file is always taken as the "right" one).
420 if Source.Table (S).Source_Found then
423 -- Otherwise, we have no source file available, so we guess
424 -- that the later of the two timestamps is the right one.
425 -- Note that this guess only affects which error messages
426 -- are issued later on, not correct functionality.
429 if Sdep.Table (D).Stamp > Source.Table (S).Stamp then
430 Source.Table (S).Stamp := Sdep.Table (D).Stamp;
436 -- Set the checksum value in the source table
438 S := Source_Id (Get_Name_Table_Info (F));
439 Source.Table (S).Checksum := Sdep.Table (D).Checksum;
443 end Set_Source_Table;
445 ----------------------
446 -- Set_Source_Table --
447 ----------------------
449 procedure Set_Source_Table is
451 for A in ALIs.First .. ALIs.Last loop
452 Set_Source_Table (A);
454 end Set_Source_Table;
456 -------------------------
457 -- Time_Stamp_Mismatch --
458 -------------------------
460 function Time_Stamp_Mismatch
462 Read_Only : Boolean := False) return File_Name_Type
465 -- Source file Id for the current Sdep entry
468 for D in ALIs.Table (A).First_Sdep .. ALIs.Table (A).Last_Sdep loop
469 Src := Source_Id (Get_Name_Table_Info (Sdep.Table (D).Sfile));
471 if Opt.Minimal_Recompilation
472 and then Sdep.Table (D).Stamp /= Source.Table (Src).Stamp
474 -- If minimal recompilation is in action, replace the stamp
475 -- of the source file in the table if checksums match.
477 -- ??? It is probably worth updating the ALI file with a new
478 -- field to avoid recomputing it each time. In any case we ensure
479 -- that we don't gobble up string table space by doing a mark
480 -- release around this computation.
485 (Get_File_Checksum (Sdep.Table (D).Sfile),
486 Source.Table (Src).Checksum)
490 Write_Str (Get_Name_String (Sdep.Table (D).Sfile));
491 Write_Str (": up to date, different timestamps " &
492 "but same checksum");
496 Sdep.Table (D).Stamp := Source.Table (Src).Stamp;
502 if (not Read_Only) or else Source.Table (Src).Source_Found then
503 if not Source.Table (Src).Source_Found
504 or else Sdep.Table (D).Stamp /= Source.Table (Src).Stamp
506 -- If -dt debug flag set, output time stamp found/expected
508 if Source.Table (Src).Source_Found and then Debug_Flag_T then
509 Write_Str ("Source: """);
510 Get_Name_String (Sdep.Table (D).Sfile);
511 Write_Str (Name_Buffer (1 .. Name_Len));
514 Write_Str (" time stamp expected: ");
515 Write_Line (String (Sdep.Table (D).Stamp));
517 Write_Str (" time stamp found: ");
518 Write_Line (String (Source.Table (Src).Stamp));
521 -- Return the source file
523 return Source.Table (Src).Sfile;
529 end Time_Stamp_Mismatch;