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 System.Strings; use System.Strings;
28 with Atree; use Atree;
31 with Debug; use Debug;
36 with Inline; use Inline;
38 with Lib.Load; use Lib.Load;
40 with Namet; use Namet;
41 with Nlists; use Nlists;
47 with Restrict; use Restrict;
48 with Rident; use Rident;
49 with Rtsfind; use Rtsfind;
50 with Snames; use Snames;
55 with Sem_Ch8; use Sem_Ch8;
57 with Sem_Elab; use Sem_Elab;
58 with Sem_Prag; use Sem_Prag;
59 with Sem_Warn; use Sem_Warn;
60 with Sinfo; use Sinfo;
61 with Sinput; use Sinput;
62 with Sinput.L; use Sinput.L;
63 with SCIL_LL; use SCIL_LL;
64 with Targparm; use Targparm;
65 with Tbuild; use Tbuild;
66 with Types; use Types;
69 Config_Pragmas : List_Id;
70 -- Gather configuration pragmas
73 -- Carry out package initializations. These are initializations which might
74 -- logically be performed at elaboration time, were it not for the fact
75 -- that we may be doing things more than once in the big loop over files.
76 -- Like elaboration, the order in which these calls are made is in some
77 -- cases important. For example, Lib cannot be initialized before Namet,
78 -- since it uses names table entries.
97 -- Create package Standard
99 CStand.Create_Standard;
101 -- If the -gnatd.H flag is present, we are only interested in the Standard
102 -- package, so the frontend has done its job here.
104 if Debug_Flag_Dot_HH then
108 -- Check possible symbol definitions specified by -gnateD switches
110 Prepcomp.Process_Command_Line_Symbol_Definitions;
112 -- If -gnatep= was specified, parse the preprocessing data file
114 if Preprocessing_Data_File /= null then
115 Name_Len := Preprocessing_Data_File'Length;
116 Name_Buffer (1 .. Name_Len) := Preprocessing_Data_File.all;
117 Prepcomp.Parse_Preprocessing_Data_File (Name_Find);
119 -- Otherwise, check if there were preprocessing symbols on the command
120 -- line and set preprocessing if there are.
123 Prepcomp.Check_Symbols;
126 -- We set Parsing_Main_Extended_Source true here to cover processing of all
127 -- the configuration pragma files, as well as the main source unit itself.
129 Parsing_Main_Extended_Source := True;
131 -- Now that the preprocessing situation is established, we are able to
132 -- load the main source (this is no longer done by Lib.Load.Initialize).
134 Lib.Load.Load_Main_Source;
136 -- Return immediately if the main source could not be found
138 if Sinput.Main_Source_File = No_Source_File then
142 -- Read and process configuration pragma files if present
145 Save_Style_Check : constant Boolean := Opt.Style_Check;
146 -- Save style check mode so it can be restored later
148 Source_Config_File : Source_File_Index;
149 -- Source reference for -gnatec configuration file
154 -- We always analyze config files with style checks off, since
155 -- we don't want a miscellaneous gnat.adc that is around to
156 -- discombobulate intended -gnatg or -gnaty compilations. We
157 -- also disconnect checking for maximum line length.
159 Opt.Style_Check := False;
160 Style_Check := False;
162 -- Capture current suppress options, which may get modified
164 Scope_Suppress := Opt.Suppress_Options;
166 -- First deal with gnat.adc file
168 if Opt.Config_File then
169 Name_Buffer (1 .. 8) := "gnat.adc";
171 Source_gnat_adc := Load_Config_File (Name_Enter);
173 if Source_gnat_adc /= No_Source_File then
174 Initialize_Scanner (No_Unit, Source_gnat_adc);
175 Config_Pragmas := Par (Configuration_Pragmas => True);
177 Config_Pragmas := Empty_List;
181 Config_Pragmas := Empty_List;
184 -- Now deal with specified config pragmas files if there are any
186 if Opt.Config_File_Names /= null then
187 for Index in Opt.Config_File_Names'Range loop
188 Name_Len := Config_File_Names (Index)'Length;
189 Name_Buffer (1 .. Name_Len) := Config_File_Names (Index).all;
190 Source_Config_File := Load_Config_File (Name_Enter);
192 if Source_Config_File = No_Source_File then
194 ("cannot find configuration pragmas file "
195 & Config_File_Names (Index).all);
198 Initialize_Scanner (No_Unit, Source_Config_File);
200 (Config_Pragmas, Par (Configuration_Pragmas => True));
204 -- Now analyze all pragmas except those whose analysis must be
205 -- deferred till after the main unit is analyzed.
207 if Config_Pragmas /= Error_List
208 and then Operating_Mode /= Check_Syntax
210 Prag := First (Config_Pragmas);
211 while Present (Prag) loop
212 if not Delay_Config_Pragma_Analyze (Prag) then
213 Analyze_Pragma (Prag);
220 -- Restore style check, but if config file turned on checks, leave on!
222 Opt.Style_Check := Save_Style_Check or Style_Check;
224 -- Capture any modifications to suppress options from config pragmas
226 Opt.Suppress_Options := Scope_Suppress;
229 -- This is where we can capture the value of the compilation unit specific
230 -- restrictions that have been set by the config pragma files (or from
231 -- Targparm), for later restoration when processing e.g. subunits.
233 Save_Config_Cunit_Boolean_Restrictions;
235 -- If there was a -gnatem switch, initialize the mappings of unit names to
236 -- file names and of file names to path names from the mapping file.
238 if Mapping_File_Name /= null then
239 Fmap.Initialize (Mapping_File_Name.all);
242 -- Adjust Optimize_Alignment mode from debug switches if necessary
244 if Debug_Flag_Dot_SS then
245 Optimize_Alignment := 'S';
246 elsif Debug_Flag_Dot_TT then
247 Optimize_Alignment := 'T';
250 -- We have now processed the command line switches, and the configuration
251 -- pragma files, so this is the point at which we want to capture the
252 -- values of the configuration switches (see Opt for further details).
254 Opt.Register_Opt_Config_Switches;
256 -- Check for file which contains No_Body pragma
258 if Source_File_Is_No_Body (Source_Index (Main_Unit)) then
259 Change_Main_Unit_To_Spec;
262 -- Initialize the scanner. Note that we do this after the call to
263 -- Create_Standard, which uses the scanner in its processing of
264 -- floating-point bounds.
266 Initialize_Scanner (Main_Unit, Source_Index (Main_Unit));
268 -- Here we call the parser to parse the compilation unit (or units in
269 -- the check syntax mode, but in that case we won't go on to the
270 -- semantics in any case).
272 Discard_List (Par (Configuration_Pragmas => False));
273 Parsing_Main_Extended_Source := False;
275 -- The main unit is now loaded, and subunits of it can be loaded,
276 -- without reporting spurious loading circularities.
278 Set_Loading (Main_Unit, False);
280 -- Now that the main unit is installed, we can complete the analysis
281 -- of the pragmas in gnat.adc and the configuration file, that require
282 -- a context for their semantic processing.
284 if Config_Pragmas /= Error_List
285 and then Operating_Mode /= Check_Syntax
287 -- Do not attempt to process deferred configuration pragmas if the main
288 -- unit failed to load, to avoid cascaded inconsistencies that can lead
289 -- to a compiler crash.
291 and then not Fatal_Error (Main_Unit)
293 -- Pragmas that require some semantic activity, such as
294 -- Interrupt_State, cannot be processed until the main unit
295 -- is installed, because they require a compilation unit on
296 -- which to attach with_clauses, etc. So analyze them now.
302 Prag := First (Config_Pragmas);
303 while Present (Prag) loop
304 if Delay_Config_Pragma_Analyze (Prag) then
305 Analyze_Pragma (Prag);
313 -- If we have restriction No_Exception_Propagation, and we did not have an
314 -- explicit switch turning off Warn_On_Non_Local_Exception, then turn on
315 -- this warning by default if we have encountered an exception handler.
317 if Restriction_Check_Required (No_Exception_Propagation)
318 and then not No_Warn_On_Non_Local_Exception
319 and then Exception_Handler_Encountered
321 Warn_On_Non_Local_Exception := True;
324 -- Now on to the semantics. Skip if in syntax only mode
326 if Operating_Mode /= Check_Syntax then
328 -- Install the configuration pragmas in the tree
330 Set_Config_Pragmas (Aux_Decls_Node (Cunit (Main_Unit)), Config_Pragmas);
332 -- Following steps are skipped if we had a fatal error during parsing
334 if not Fatal_Error (Main_Unit) then
336 -- Reset Operating_Mode to Check_Semantics for subunits. We cannot
337 -- actually generate code for subunits, so we suppress expansion.
338 -- This also corrects certain problems that occur if we try to
339 -- incorporate subunits at a lower level.
341 if Operating_Mode = Generate_Code
342 and then Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
344 Operating_Mode := Check_Semantics;
347 -- Analyze (and possibly expand) main unit
349 Scope_Suppress := Suppress_Options;
350 Semantics (Cunit (Main_Unit));
352 -- Cleanup processing after completing main analysis
354 if Operating_Mode = Generate_Code
355 or else (Operating_Mode = Check_Semantics
361 if Operating_Mode = Generate_Code then
362 if Inline_Processing_Required then
363 Analyze_Inlined_Bodies;
366 -- Remove entities from program that do not have any
367 -- execution time references.
369 if Debug_Flag_UU then
370 Collect_Garbage_Entities;
376 -- List library units if requested
382 -- Output waiting warning messages
384 Sem_Warn.Output_Non_Modified_In_Out_Warnings;
385 Sem_Warn.Output_Unreferenced_Messages;
386 Sem_Warn.Check_Unused_Withs;
387 Sem_Warn.Output_Unused_Warnings_Off_Warnings;
391 -- Qualify all entity names in inner packages, package bodies, etc.,
392 -- except when compiling for the VM back-ends, which depend on having
393 -- unqualified names in certain cases and handles the generation of
394 -- qualified names when needed.
396 if VM_Target = No_VM then
397 Exp_Dbug.Qualify_All_Entity_Names;
400 -- SCIL backend requirement. Check that SCIL nodes associated with
401 -- dispatching calls reference subprogram calls.
403 if Generate_SCIL then
404 pragma Debug (Sem_SCIL.Check_SCIL_Nodes (Cunit (Main_Unit)));
408 -- Dump the source now. Note that we do this as soon as the analysis
409 -- of the tree is complete, because it is not just a dump in the case
410 -- of -gnatD, where it rewrites all source locations in the tree.
414 -- Check again for configuration pragmas that appear in the context of
415 -- the main unit. These pragmas only affect the main unit, and the
416 -- corresponding flag is reset after each call to Semantics, but they
417 -- may affect the generated ali for the unit, and therefore the flag
418 -- must be set properly after compilation. Currently we only check for
419 -- Initialize_Scalars, but others should be checked: as well???
425 Item := First (Context_Items (Cunit (Main_Unit)));
426 while Present (Item) loop
427 if Nkind (Item) = N_Pragma
428 and then Pragma_Name (Item) = Name_Initialize_Scalars
430 Initialize_Scalars := True;
437 -- If a mapping file has been specified by a -gnatem switch, update
438 -- it if there has been some sources that were not in the mappings.
440 if Mapping_File_Name /= null then
441 Fmap.Update_Mapping_File (Mapping_File_Name.all);