1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2009, 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;
54 with Sem_Ch8; use Sem_Ch8;
56 with Sem_Elab; use Sem_Elab;
57 with Sem_Prag; use Sem_Prag;
58 with Sem_Warn; use Sem_Warn;
59 with Sinfo; use Sinfo;
60 with Sinput; use Sinput;
61 with Sinput.L; use Sinput.L;
62 with Targparm; use Targparm;
63 with Tbuild; use Tbuild;
64 with Types; use Types;
67 Config_Pragmas : List_Id;
68 -- Gather configuration pragmas
71 -- Carry out package initializations. These are initializations which might
72 -- logically be performed at elaboration time, were it not for the fact
73 -- that we may be doing things more than once in the big loop over files.
74 -- Like elaboration, the order in which these calls are made is in some
75 -- cases important. For example, Lib cannot be initialized before Namet,
76 -- since it uses names table entries.
91 -- Create package Standard
93 CStand.Create_Standard;
95 -- Check possible symbol definitions specified by -gnateD switches
97 Prepcomp.Process_Command_Line_Symbol_Definitions;
99 -- If -gnatep= was specified, parse the preprocessing data file
101 if Preprocessing_Data_File /= null then
102 Name_Len := Preprocessing_Data_File'Length;
103 Name_Buffer (1 .. Name_Len) := Preprocessing_Data_File.all;
104 Prepcomp.Parse_Preprocessing_Data_File (Name_Find);
106 -- Otherwise, check if there were preprocessing symbols on the command
107 -- line and set preprocessing if there are.
110 Prepcomp.Check_Symbols;
113 -- Now that the preprocessing situation is established, we are able to
114 -- load the main source (this is no longer done by Lib.Load.Initialize).
116 Lib.Load.Load_Main_Source;
118 -- Return immediately if the main source could not be parsed
120 if Sinput.Main_Source_File = No_Source_File then
124 -- Read and process configuration pragma files if present
127 Save_Style_Check : constant Boolean := Opt.Style_Check;
128 -- Save style check mode so it can be restored later
130 Source_Config_File : Source_File_Index;
131 -- Source reference for -gnatec configuration file
136 -- We always analyze config files with style checks off, since
137 -- we don't want a miscellaneous gnat.adc that is around to
138 -- discombobulate intended -gnatg or -gnaty compilations. We
139 -- also disconnect checking for maximum line length.
141 Opt.Style_Check := False;
142 Style_Check := False;
144 -- Capture current suppress options, which may get modified
146 Scope_Suppress := Opt.Suppress_Options;
148 -- First deal with gnat.adc file
150 if Opt.Config_File then
151 Name_Buffer (1 .. 8) := "gnat.adc";
153 Source_gnat_adc := Load_Config_File (Name_Enter);
155 if Source_gnat_adc /= No_Source_File then
156 Initialize_Scanner (No_Unit, Source_gnat_adc);
157 Config_Pragmas := Par (Configuration_Pragmas => True);
160 Config_Pragmas := Empty_List;
164 Config_Pragmas := Empty_List;
167 -- Now deal with specified config pragmas files if there are any
169 if Opt.Config_File_Names /= null then
170 for Index in Opt.Config_File_Names'Range loop
171 Name_Len := Config_File_Names (Index)'Length;
172 Name_Buffer (1 .. Name_Len) := Config_File_Names (Index).all;
173 Source_Config_File := Load_Config_File (Name_Enter);
175 if Source_Config_File = No_Source_File then
177 ("cannot find configuration pragmas file "
178 & Config_File_Names (Index).all);
181 Initialize_Scanner (No_Unit, Source_Config_File);
183 (Config_Pragmas, Par (Configuration_Pragmas => True));
187 -- Now analyze all pragmas except those whose analysis must be
188 -- deferred till after the main unit is analyzed.
190 if Config_Pragmas /= Error_List
191 and then Operating_Mode /= Check_Syntax
193 Prag := First (Config_Pragmas);
194 while Present (Prag) loop
195 if not Delay_Config_Pragma_Analyze (Prag) then
196 Analyze_Pragma (Prag);
203 -- Restore style check, but if config file turned on checks, leave on!
205 Opt.Style_Check := Save_Style_Check or Style_Check;
207 -- Capture any modifications to suppress options from config pragmas
209 Opt.Suppress_Options := Scope_Suppress;
212 -- If there was a -gnatem switch, initialize the mappings of unit names to
213 -- file names and of file names to path names from the mapping file.
215 if Mapping_File_Name /= null then
216 Fmap.Initialize (Mapping_File_Name.all);
219 -- Adjust Optimize_Alignment mode from debug switches if necessary
221 if Debug_Flag_Dot_SS then
222 Optimize_Alignment := 'S';
223 elsif Debug_Flag_Dot_TT then
224 Optimize_Alignment := 'T';
227 -- We have now processed the command line switches, and the gnat.adc
228 -- file, so this is the point at which we want to capture the values
229 -- of the configuration switches (see Opt for further details).
231 Opt.Register_Opt_Config_Switches;
233 -- Check for file which contains No_Body pragma
235 if Source_File_Is_No_Body (Source_Index (Main_Unit)) then
236 Change_Main_Unit_To_Spec;
239 -- Initialize the scanner. Note that we do this after the call to
240 -- Create_Standard, which uses the scanner in its processing of
241 -- floating-point bounds.
243 Initialize_Scanner (Main_Unit, Source_Index (Main_Unit));
245 -- Here we call the parser to parse the compilation unit (or units in
246 -- the check syntax mode, but in that case we won't go on to the
247 -- semantics in any case).
249 Discard_List (Par (Configuration_Pragmas => False));
251 -- The main unit is now loaded, and subunits of it can be loaded,
252 -- without reporting spurious loading circularities.
254 Set_Loading (Main_Unit, False);
256 -- Now that the main unit is installed, we can complete the analysis
257 -- of the pragmas in gnat.adc and the configuration file, that require
258 -- a context for their semantic processing.
260 if Config_Pragmas /= Error_List
261 and then Operating_Mode /= Check_Syntax
263 -- Pragmas that require some semantic activity, such as
264 -- Interrupt_State, cannot be processed until the main unit
265 -- is installed, because they require a compilation unit on
266 -- which to attach with_clauses, etc. So analyze them now.
272 Prag := First (Config_Pragmas);
273 while Present (Prag) loop
274 if Delay_Config_Pragma_Analyze (Prag) then
275 Analyze_Pragma (Prag);
283 -- If we have restriction No_Exception_Propagation, and we did not have an
284 -- explicit switch turning off Warn_On_Non_Local_Exception, then turn on
285 -- this warning by default if we have encountered an exception handler.
287 if Restriction_Active (No_Exception_Propagation)
288 and then not No_Warn_On_Non_Local_Exception
289 and then Exception_Handler_Encountered
291 Warn_On_Non_Local_Exception := True;
294 -- Now on to the semantics. Skip if in syntax only mode
296 if Operating_Mode /= Check_Syntax then
298 -- Install the configuration pragmas in the tree
300 Set_Config_Pragmas (Aux_Decls_Node (Cunit (Main_Unit)), Config_Pragmas);
302 -- Following steps are skipped if we had a fatal error during parsing
304 if not Fatal_Error (Main_Unit) then
306 -- Reset Operating_Mode to Check_Semantics for subunits. We cannot
307 -- actually generate code for subunits, so we suppress expansion.
308 -- This also corrects certain problems that occur if we try to
309 -- incorporate subunits at a lower level.
311 if Operating_Mode = Generate_Code
312 and then Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
314 Operating_Mode := Check_Semantics;
317 -- Analyze (and possibly expand) main unit
319 Scope_Suppress := Suppress_Options;
320 Semantics (Cunit (Main_Unit));
322 -- Cleanup processing after completing main analysis
324 if Operating_Mode = Generate_Code
325 or else (Operating_Mode = Check_Semantics
331 if Operating_Mode = Generate_Code then
332 if Inline_Processing_Required then
333 Analyze_Inlined_Bodies;
336 -- Remove entities from program that do not have any
337 -- execution time references.
339 if Debug_Flag_UU then
340 Collect_Garbage_Entities;
346 -- List library units if requested
352 -- Output waiting warning messages
354 Sem_Warn.Output_Non_Modified_In_Out_Warnings;
355 Sem_Warn.Output_Unreferenced_Messages;
356 Sem_Warn.Check_Unused_Withs;
357 Sem_Warn.Output_Unused_Warnings_Off_Warnings;
361 -- Qualify all entity names in inner packages, package bodies, etc.,
362 -- except when compiling for the VM back-ends, which depend on
363 -- having unqualified names in certain cases and handles the
364 -- generation of qualified names when needed.
366 if VM_Target = No_VM then
367 Exp_Dbug.Qualify_All_Entity_Names;
370 -- SCIL backend requirement. Check that SCIL nodes associated with
371 -- dispatching calls reference subprogram calls.
373 if Generate_SCIL then
374 pragma Debug (Sem_SCIL.Check_SCIL_Nodes (Cunit (Main_Unit)));
378 -- Dump the source now. Note that we do this as soon as the analysis
379 -- of the tree is complete, because it is not just a dump in the case
380 -- of -gnatD, where it rewrites all source locations in the tree.
384 -- If a mapping file has been specified by a -gnatem switch, update
385 -- it if there has been some sources that were not in the mappings.
387 if Mapping_File_Name /= null then
388 Fmap.Update_Mapping_File (Mapping_File_Name.all);