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;
50 with Sem_Ch8; use Sem_Ch8;
51 with Sem_Elab; use Sem_Elab;
52 with Sem_Prag; use Sem_Prag;
53 with Sem_Warn; use Sem_Warn;
54 with Sinfo; use Sinfo;
55 with Sinput; use Sinput;
56 with Sinput.L; use Sinput.L;
57 with Targparm; use Targparm;
58 with Tbuild; use Tbuild;
59 with Types; use Types;
62 Config_Pragmas : List_Id;
63 -- Gather configuration pragmas
66 -- Carry out package initializations. These are initializations which
67 -- might logically be performed at elaboration time, were it not for
68 -- the fact that we may be doing things more than once in the big loop
69 -- over files. Like elaboration, the order in which these calls are
70 -- made is in some cases important. For example, Lib cannot be
71 -- initialized until Namet, since it uses names table entries.
83 -- Create package Standard
85 CStand.Create_Standard;
87 -- Check possible symbol definitions specified by -gnateD switches
89 Prepcomp.Process_Command_Line_Symbol_Definitions;
91 -- If -gnatep= was specified, parse the preprocessing data file
93 if Preprocessing_Data_File /= null then
94 Name_Len := Preprocessing_Data_File'Length;
95 Name_Buffer (1 .. Name_Len) := Preprocessing_Data_File.all;
96 Prepcomp.Parse_Preprocessing_Data_File (Name_Find);
98 -- Otherwise, check if there were preprocessing symbols on the command
99 -- line and set preprocessing if there are.
102 Prepcomp.Check_Symbols;
105 -- Now that the preprocessing situation is established, we are able to
106 -- load the main source (this is no longer done by Lib.Load.Initalize).
108 Lib.Load.Load_Main_Source;
110 -- Return immediately if the main source could not be parsed
112 if Sinput.Main_Source_File = No_Source_File then
116 -- Read and process configuration pragma files if present
119 Save_Style_Check : constant Boolean := Opt.Style_Check;
120 -- Save style check mode so it can be restored later
122 Source_Config_File : Source_File_Index;
123 -- Source reference for -gnatec configuration file
128 -- We always analyze config files with style checks off, since
129 -- we don't want a miscellaneous gnat.adc that is around to
130 -- discombobulate intended -gnatg or -gnaty compilations. We
131 -- also disconnect checking for maximum line length.
133 Opt.Style_Check := False;
134 Style_Check := False;
136 -- Capture current suppress options, which may get modified
138 Scope_Suppress := Opt.Suppress_Options;
140 -- First deal with gnat.adc file
142 if Opt.Config_File then
143 Name_Buffer (1 .. 8) := "gnat.adc";
145 Source_gnat_adc := Load_Config_File (Name_Enter);
147 if Source_gnat_adc /= No_Source_File then
148 Initialize_Scanner (No_Unit, Source_gnat_adc);
149 Config_Pragmas := Par (Configuration_Pragmas => True);
152 Config_Pragmas := Empty_List;
156 Config_Pragmas := Empty_List;
159 -- Now deal with specified config pragmas files if there are any
161 if Opt.Config_File_Names /= null then
162 for Index in Opt.Config_File_Names'Range loop
163 Name_Len := Config_File_Names (Index)'Length;
164 Name_Buffer (1 .. Name_Len) := Config_File_Names (Index).all;
165 Source_Config_File := Load_Config_File (Name_Enter);
167 if Source_Config_File = No_Source_File then
169 ("cannot find configuration pragmas file ",
170 Config_File_Names (Index).all);
173 Initialize_Scanner (No_Unit, Source_Config_File);
175 (Config_Pragmas, Par (Configuration_Pragmas => True));
179 -- Now analyze all pragmas except those whose analysis must be
180 -- deferred till after the main unit is analyzed.
182 if Config_Pragmas /= Error_List
183 and then Operating_Mode /= Check_Syntax
185 Prag := First (Config_Pragmas);
186 while Present (Prag) loop
187 if not Delay_Config_Pragma_Analyze (Prag) then
188 Analyze_Pragma (Prag);
195 -- Restore style check, but if config file turned on checks, leave on!
197 Opt.Style_Check := Save_Style_Check or Style_Check;
199 -- Capture any modifications to suppress options from config pragmas
201 Opt.Suppress_Options := Scope_Suppress;
204 -- If there was a -gnatem switch, initialize the mappings of unit names to
205 -- file names and of file names to path names from the mapping file.
207 if Mapping_File_Name /= null then
208 Fmap.Initialize (Mapping_File_Name.all);
211 -- Adjust Optimize_Alignment mode from debug switches if necessary
213 if Debug_Flag_Dot_SS then
214 Optimize_Alignment := 'S';
215 elsif Debug_Flag_Dot_TT then
216 Optimize_Alignment := 'T';
219 -- We have now processed the command line switches, and the gnat.adc
220 -- file, so this is the point at which we want to capture the values
221 -- of the configuration switches (see Opt for further details).
223 Opt.Register_Opt_Config_Switches;
225 -- Check for file which contains No_Body pragma
227 if Source_File_Is_No_Body (Source_Index (Main_Unit)) then
228 Change_Main_Unit_To_Spec;
231 -- Initialize the scanner. Note that we do this after the call to
232 -- Create_Standard, which uses the scanner in its processing of
233 -- floating-point bounds.
235 Initialize_Scanner (Main_Unit, Source_Index (Main_Unit));
237 -- Here we call the parser to parse the compilation unit (or units in
238 -- the check syntax mode, but in that case we won't go on to the
239 -- semantics in any case).
241 Discard_List (Par (Configuration_Pragmas => False));
243 -- The main unit is now loaded, and subunits of it can be loaded,
244 -- without reporting spurious loading circularities.
246 Set_Loading (Main_Unit, False);
248 -- Now that the main unit is installed, we can complete the analysis
249 -- of the pragmas in gnat.adc and the configuration file, that require
250 -- a context for their semantic processing.
252 if Config_Pragmas /= Error_List
253 and then Operating_Mode /= Check_Syntax
255 -- Pragmas that require some semantic activity, such as
256 -- Interrupt_State, cannot be processed until the main unit
257 -- is installed, because they require a compilation unit on
258 -- which to attach with_clauses, etc. So analyze them now.
264 Prag := First (Config_Pragmas);
265 while Present (Prag) loop
266 if Delay_Config_Pragma_Analyze (Prag) then
267 Analyze_Pragma (Prag);
275 -- Now on to the semantics. Skip if in syntax only mode
277 if Operating_Mode /= Check_Syntax then
279 -- Install the configuration pragmas in the tree
281 Set_Config_Pragmas (Aux_Decls_Node (Cunit (Main_Unit)), Config_Pragmas);
283 -- Following steps are skipped if we had a fatal error during parsing
285 if not Fatal_Error (Main_Unit) then
287 -- Reset Operating_Mode to Check_Semantics for subunits. We cannot
288 -- actually generate code for subunits, so we suppress expansion.
289 -- This also corrects certain problems that occur if we try to
290 -- incorporate subunits at a lower level.
292 if Operating_Mode = Generate_Code
293 and then Nkind (Unit (Cunit (Main_Unit))) = N_Subunit
295 Operating_Mode := Check_Semantics;
298 -- Analyze (and possibly expand) main unit
300 Scope_Suppress := Suppress_Options;
301 Semantics (Cunit (Main_Unit));
303 -- Cleanup processing after completing main analysis
305 if Operating_Mode = Generate_Code
306 or else (Operating_Mode = Check_Semantics
312 if Operating_Mode = Generate_Code then
313 if Inline_Processing_Required then
314 Analyze_Inlined_Bodies;
317 -- Remove entities from program that do not have any
318 -- execution time references.
320 if Debug_Flag_UU then
321 Collect_Garbage_Entities;
327 -- List library units if requested
333 -- Output waiting warning messages
335 Sem_Warn.Output_Non_Modifed_In_Out_Warnings;
336 Sem_Warn.Output_Unreferenced_Messages;
337 Sem_Warn.Check_Unused_Withs;
338 Sem_Warn.Output_Unused_Warnings_Off_Warnings;
342 -- Qualify all entity names in inner packages, package bodies, etc.,
343 -- except when compiling for the VM back-ends, which depend on
344 -- having unqualified names in certain cases and handles the
345 -- generation of qualified names when needed.
347 if VM_Target = No_VM then
348 Exp_Dbug.Qualify_All_Entity_Names;
351 -- Dump the source now. Note that we do this as soon as the analysis
352 -- of the tree is complete, because it is not just a dump in the case
353 -- of -gnatD, where it rewrites all source locations in the tree.
357 -- If a mapping file has been specified by a -gnatem switch, update
358 -- it if there has been some sourcs that were not in the mappings.
360 if Mapping_File_Name /= null then
361 Fmap.Update_Mapping_File (Mapping_File_Name.all);