1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2008, 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;
46 with Restrict; use Restrict;
47 with Rident; use Rident;
53 with Sem_Ch8; use Sem_Ch8;
54 with Sem_Elab; use Sem_Elab;
55 with Sem_Prag; use Sem_Prag;
56 with Sem_Warn; use Sem_Warn;
57 with Sinfo; use Sinfo;
58 with Sinput; use Sinput;
59 with Sinput.L; use Sinput.L;
60 with Targparm; use Targparm;
61 with Tbuild; use Tbuild;
62 with Types; use Types;
65 Config_Pragmas : List_Id;
66 -- Gather configuration pragmas
69 -- Carry out package initializations. These are initializations which might
70 -- logically be performed at elaboration time, were it not for the fact
71 -- that we may be doing things more than once in the big loop over files.
72 -- Like elaboration, the order in which these calls are made is in some
73 -- cases important. For example, Lib cannot be initialized until Namet,
74 -- since it uses names table entries.
88 -- Create package Standard
90 CStand.Create_Standard;
92 -- Check possible symbol definitions specified by -gnateD switches
94 Prepcomp.Process_Command_Line_Symbol_Definitions;
96 -- If -gnatep= was specified, parse the preprocessing data file
98 if Preprocessing_Data_File /= null then
99 Name_Len := Preprocessing_Data_File'Length;
100 Name_Buffer (1 .. Name_Len) := Preprocessing_Data_File.all;
101 Prepcomp.Parse_Preprocessing_Data_File (Name_Find);
103 -- Otherwise, check if there were preprocessing symbols on the command
104 -- line and set preprocessing if there are.
107 Prepcomp.Check_Symbols;
110 -- Now that the preprocessing situation is established, we are able to
111 -- load the main source (this is no longer done by Lib.Load.Initialize).
113 Lib.Load.Load_Main_Source;
115 -- Return immediately if the main source could not be parsed
117 if Sinput.Main_Source_File = No_Source_File then
121 -- Read and process configuration pragma files if present
124 Save_Style_Check : constant Boolean := Opt.Style_Check;
125 -- Save style check mode so it can be restored later
127 Source_Config_File : Source_File_Index;
128 -- Source reference for -gnatec configuration file
133 -- We always analyze config files with style checks off, since
134 -- we don't want a miscellaneous gnat.adc that is around to
135 -- discombobulate intended -gnatg or -gnaty compilations. We
136 -- also disconnect checking for maximum line length.
138 Opt.Style_Check := False;
139 Style_Check := False;
141 -- Capture current suppress options, which may get modified
143 Scope_Suppress := Opt.Suppress_Options;
145 -- First deal with gnat.adc file
147 if Opt.Config_File then
148 Name_Buffer (1 .. 8) := "gnat.adc";
150 Source_gnat_adc := Load_Config_File (Name_Enter);
152 if Source_gnat_adc /= No_Source_File then
153 Initialize_Scanner (No_Unit, Source_gnat_adc);
154 Config_Pragmas := Par (Configuration_Pragmas => True);
157 Config_Pragmas := Empty_List;
161 Config_Pragmas := Empty_List;
164 -- Now deal with specified config pragmas files if there are any
166 if Opt.Config_File_Names /= null then
167 for Index in Opt.Config_File_Names'Range loop
168 Name_Len := Config_File_Names (Index)'Length;
169 Name_Buffer (1 .. Name_Len) := Config_File_Names (Index).all;
170 Source_Config_File := Load_Config_File (Name_Enter);
172 if Source_Config_File = No_Source_File then
174 ("cannot find configuration pragmas file "
175 & Config_File_Names (Index).all);
178 Initialize_Scanner (No_Unit, Source_Config_File);
180 (Config_Pragmas, Par (Configuration_Pragmas => True));
184 -- Now analyze all pragmas except those whose analysis must be
185 -- deferred till after the main unit is analyzed.
187 if Config_Pragmas /= Error_List
188 and then Operating_Mode /= Check_Syntax
190 Prag := First (Config_Pragmas);
191 while Present (Prag) loop
192 if not Delay_Config_Pragma_Analyze (Prag) then
193 Analyze_Pragma (Prag);
200 -- Restore style check, but if config file turned on checks, leave on!
202 Opt.Style_Check := Save_Style_Check or Style_Check;
204 -- Capture any modifications to suppress options from config pragmas
206 Opt.Suppress_Options := Scope_Suppress;
209 -- If there was a -gnatem switch, initialize the mappings of unit names to
210 -- file names and of file names to path names from the mapping file.
212 if Mapping_File_Name /= null then
213 Fmap.Initialize (Mapping_File_Name.all);
216 -- Adjust Optimize_Alignment mode from debug switches if necessary
218 if Debug_Flag_Dot_SS then
219 Optimize_Alignment := 'S';
220 elsif Debug_Flag_Dot_TT then
221 Optimize_Alignment := 'T';
224 -- We have now processed the command line switches, and the gnat.adc
225 -- file, so this is the point at which we want to capture the values
226 -- of the configuration switches (see Opt for further details).
228 Opt.Register_Opt_Config_Switches;
230 -- Check for file which contains No_Body pragma
232 if Source_File_Is_No_Body (Source_Index (Main_Unit)) then
233 Change_Main_Unit_To_Spec;
236 -- Initialize the scanner. Note that we do this after the call to
237 -- Create_Standard, which uses the scanner in its processing of
238 -- floating-point bounds.
240 Initialize_Scanner (Main_Unit, Source_Index (Main_Unit));
242 -- Here we call the parser to parse the compilation unit (or units in
243 -- the check syntax mode, but in that case we won't go on to the
244 -- semantics in any case).
246 Discard_List (Par (Configuration_Pragmas => False));
248 -- The main unit is now loaded, and subunits of it can be loaded,
249 -- without reporting spurious loading circularities.
251 Set_Loading (Main_Unit, False);
253 -- Now that the main unit is installed, we can complete the analysis
254 -- of the pragmas in gnat.adc and the configuration file, that require
255 -- a context for their semantic processing.
257 if Config_Pragmas /= Error_List
258 and then Operating_Mode /= Check_Syntax
260 -- Pragmas that require some semantic activity, such as
261 -- Interrupt_State, cannot be processed until the main unit
262 -- is installed, because they require a compilation unit on
263 -- which to attach with_clauses, etc. So analyze them now.
269 Prag := First (Config_Pragmas);
270 while Present (Prag) loop
271 if Delay_Config_Pragma_Analyze (Prag) then
272 Analyze_Pragma (Prag);
280 -- If we have restriction No_Exception_Propagation, and we did not have
281 -- an explicit switch turning off Warn_On_Local_Exception, then turn on
282 -- this warning by default if we have encountered an exception handler.
284 if Restriction_Active (No_Exception_Propagation)
285 and then not No_Warn_On_Non_Local_Exception
286 and then Exception_Handler_Encountered
288 Warn_On_Non_Local_Exception := True;
291 -- Now on to the semantics. Skip if in syntax only mode
293 if Operating_Mode /= Check_Syntax then
295 -- Install the configuration pragmas in the tree
297 Set_Config_Pragmas (Aux_Decls_Node (Cunit (Main_Unit)), Config_Pragmas);
299 -- Following steps are skipped if we had a fatal error during parsing
301 if not Fatal_Error (Main_Unit) then
303 -- Reset Operating_Mode to Check_Semantics for subunits. We cannot
304 -- actually generate code for subunits, so we suppress expansion.
305 -- This also corrects certain problems that occur if we try to
306 -- incorporate subunits at a lower level.
308 if Operating_Mode = Generate_Code
309 and then Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
311 Operating_Mode := Check_Semantics;
314 -- Analyze (and possibly expand) main unit
316 Scope_Suppress := Suppress_Options;
317 Semantics (Cunit (Main_Unit));
319 -- Cleanup processing after completing main analysis
321 if Operating_Mode = Generate_Code
322 or else (Operating_Mode = Check_Semantics
328 if Operating_Mode = Generate_Code then
329 if Inline_Processing_Required then
330 Analyze_Inlined_Bodies;
333 -- Remove entities from program that do not have any
334 -- execution time references.
336 if Debug_Flag_UU then
337 Collect_Garbage_Entities;
343 -- List library units if requested
349 -- Output waiting warning messages
351 Sem_Warn.Output_Non_Modifed_In_Out_Warnings;
352 Sem_Warn.Output_Unreferenced_Messages;
353 Sem_Warn.Check_Unused_Withs;
354 Sem_Warn.Output_Unused_Warnings_Off_Warnings;
358 -- Qualify all entity names in inner packages, package bodies, etc.,
359 -- except when compiling for the VM back-ends, which depend on
360 -- having unqualified names in certain cases and handles the
361 -- generation of qualified names when needed.
363 if VM_Target = No_VM then
364 Exp_Dbug.Qualify_All_Entity_Names;
367 -- Dump the source now. Note that we do this as soon as the analysis
368 -- of the tree is complete, because it is not just a dump in the case
369 -- of -gnatD, where it rewrites all source locations in the tree.
373 -- If a mapping file has been specified by a -gnatem switch, update
374 -- it if there has been some sources that were not in the mappings.
376 if Mapping_File_Name /= null then
377 Fmap.Update_Mapping_File (Mapping_File_Name.all);