1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2015, 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
;
37 with Ghost
; use Ghost
;
38 with Inline
; use Inline
;
40 with Lib
.Load
; use Lib
.Load
;
41 with Lib
.Xref
; use Lib
.Xref
;
43 with Namet
; use Namet
;
44 with Nlists
; use Nlists
;
50 with Restrict
; use Restrict
;
51 with Rident
; use Rident
;
52 with Rtsfind
; use Rtsfind
;
53 with Snames
; use Snames
;
58 with Sem_Ch8
; use Sem_Ch8
;
60 with Sem_Elab
; use Sem_Elab
;
61 with Sem_Prag
; use Sem_Prag
;
62 with Sem_Warn
; use Sem_Warn
;
63 with Sinfo
; use Sinfo
;
64 with Sinput
; use Sinput
;
65 with Sinput
.L
; use Sinput
.L
;
66 with SCIL_LL
; use SCIL_LL
;
67 with Tbuild
; use Tbuild
;
68 with Types
; use Types
;
71 Config_Pragmas
: List_Id
;
72 -- Gather configuration pragmas
75 -- Carry out package initializations. These are initializations which might
76 -- logically be performed at elaboration time, were it not for the fact
77 -- that we may be doing things more than once in the big loop over files.
78 -- Like elaboration, the order in which these calls are made is in some
79 -- cases important. For example, Lib cannot be initialized before Namet,
80 -- since it uses names table entries.
99 -- Create package Standard
101 CStand
.Create_Standard
;
103 -- Check possible symbol definitions specified by -gnateD switches
105 Prepcomp
.Process_Command_Line_Symbol_Definitions
;
107 -- If -gnatep= was specified, parse the preprocessing data file
109 if Preprocessing_Data_File
/= null then
110 Name_Len
:= Preprocessing_Data_File
'Length;
111 Name_Buffer
(1 .. Name_Len
) := Preprocessing_Data_File
.all;
112 Prepcomp
.Parse_Preprocessing_Data_File
(Name_Find
);
114 -- Otherwise, check if there were preprocessing symbols on the command
115 -- line and set preprocessing if there are.
118 Prepcomp
.Check_Symbols
;
121 -- We set Parsing_Main_Extended_Source true here to cover processing of all
122 -- the configuration pragma files, as well as the main source unit itself.
124 Parsing_Main_Extended_Source
:= True;
126 -- Now that the preprocessing situation is established, we are able to
127 -- load the main source (this is no longer done by Lib.Load.Initialize).
129 Lib
.Load
.Load_Main_Source
;
131 -- Return immediately if the main source could not be found
133 if Sinput
.Main_Source_File
= No_Source_File
then
137 -- Read and process configuration pragma files if present
140 Save_Style_Check
: constant Boolean := Opt
.Style_Check
;
141 -- Save style check mode so it can be restored later
143 Source_Config_File
: Source_File_Index
;
144 -- Source reference for -gnatec configuration file
151 -- We always analyze config files with style checks off, since we
152 -- don't want a miscellaneous gnat.adc that is around to discombobulate
153 -- intended -gnatg or -gnaty compilations. We also disconnect checking
154 -- for maximum line length.
156 Opt
.Style_Check
:= False;
157 Style_Check
:= False;
159 -- Capture current suppress options, which may get modified
161 Scope_Suppress
:= Opt
.Suppress_Options
;
163 -- First deal with gnat.adc file
165 if Opt
.Config_File
then
166 Name_Buffer
(1 .. 8) := "gnat.adc";
168 Source_gnat_adc
:= Load_Config_File
(Name_Enter
);
170 -- Case of gnat.adc file present
172 if Source_gnat_adc
/= No_Source_File
then
174 -- Parse the gnat.adc file for configuration pragmas
176 Initialize_Scanner
(No_Unit
, Source_gnat_adc
);
177 Config_Pragmas
:= Par
(Configuration_Pragmas
=> True);
179 -- We unconditionally add a compilation dependency for gnat.adc
180 -- so that if it changes, we force a recompilation. This is a
181 -- fairly recent (2014-03-28) change.
183 Prepcomp
.Add_Dependency
(Source_gnat_adc
);
185 -- Case of no gnat.adc file present
188 Config_Pragmas
:= Empty_List
;
192 Config_Pragmas
:= Empty_List
;
195 -- Now deal with specified config pragmas files if there are any
197 if Opt
.Config_File_Names
/= null then
199 -- Loop through config pragmas files
201 for Index
in Opt
.Config_File_Names
'Range loop
203 -- See if extension is .TMP/.tmp indicating a temporary config
204 -- file (which we ignore from the dependency point of view).
206 Name_Len
:= Config_File_Names
(Index
)'Length;
207 Name_Buffer
(1 .. Name_Len
) := Config_File_Names
(Index
).all;
211 (Name_Buffer
(Name_Len
- 3 .. Name_Len
) = ".TMP"
213 Name_Buffer
(Name_Len
- 3 .. Name_Len
) = ".tmp");
215 -- Load the file, error if we did not find it
217 Source_Config_File
:= Load_Config_File
(Name_Enter
);
219 if Source_Config_File
= No_Source_File
then
221 ("cannot find configuration pragmas file "
222 & Config_File_Names
(Index
).all);
224 -- If we did find the file, and it is not a temporary file, then
225 -- we unconditionally add a compilation dependency for it so
226 -- that if it changes, we force a recompilation. This is a
227 -- fairly recent (2014-03-28) change.
229 elsif not Temp_File
then
230 Prepcomp
.Add_Dependency
(Source_Config_File
);
233 -- Parse the config pragmas file, and accumulate results
235 Initialize_Scanner
(No_Unit
, Source_Config_File
);
237 (Config_Pragmas
, Par
(Configuration_Pragmas
=> True));
241 -- Now analyze all pragmas except those whose analysis must be
242 -- deferred till after the main unit is analyzed.
244 if Config_Pragmas
/= Error_List
245 and then Operating_Mode
/= Check_Syntax
247 Prag
:= First
(Config_Pragmas
);
248 while Present
(Prag
) loop
249 if not Delay_Config_Pragma_Analyze
(Prag
) then
250 Analyze_Pragma
(Prag
);
257 -- Restore style check, but if config file turned on checks, leave on
259 Opt
.Style_Check
:= Save_Style_Check
or Style_Check
;
261 -- Capture any modifications to suppress options from config pragmas
263 Opt
.Suppress_Options
:= Scope_Suppress
;
266 -- If a target dependency info file has been read through switch -gnateT=,
267 -- add it to the dependencies.
269 if Target_Dependent_Info_Read_Name
/= null then
271 Index
: Source_File_Index
;
274 Add_Str_To_Name_Buffer
(Target_Dependent_Info_Read_Name
.all);
275 Index
:= Load_Config_File
(Name_Enter
);
276 Prepcomp
.Add_Dependency
(Index
);
280 -- This is where we can capture the value of the compilation unit specific
281 -- restrictions that have been set by the config pragma files (or from
282 -- Targparm), for later restoration when processing e.g. subunits.
284 Save_Config_Cunit_Boolean_Restrictions
;
286 -- If there was a -gnatem switch, initialize the mappings of unit names to
287 -- file names and of file names to path names from the mapping file.
289 if Mapping_File_Name
/= null then
290 Fmap
.Initialize
(Mapping_File_Name
.all);
293 -- Adjust Optimize_Alignment mode from debug switches if necessary
295 if Debug_Flag_Dot_SS
then
296 Optimize_Alignment
:= 'S';
297 elsif Debug_Flag_Dot_TT
then
298 Optimize_Alignment
:= 'T';
301 -- We have now processed the command line switches, and the configuration
302 -- pragma files, so this is the point at which we want to capture the
303 -- values of the configuration switches (see Opt for further details).
305 Opt
.Register_Opt_Config_Switches
;
307 -- Check for file which contains No_Body pragma
309 if Source_File_Is_No_Body
(Source_Index
(Main_Unit
)) then
310 Change_Main_Unit_To_Spec
;
313 -- Initialize the scanner. Note that we do this after the call to
314 -- Create_Standard, which uses the scanner in its processing of
315 -- floating-point bounds.
317 Initialize_Scanner
(Main_Unit
, Source_Index
(Main_Unit
));
319 -- Here we call the parser to parse the compilation unit (or units in
320 -- the check syntax mode, but in that case we won't go on to the
321 -- semantics in any case).
323 Discard_List
(Par
(Configuration_Pragmas
=> False));
324 Parsing_Main_Extended_Source
:= False;
326 -- The main unit is now loaded, and subunits of it can be loaded,
327 -- without reporting spurious loading circularities.
329 Set_Loading
(Main_Unit
, False);
331 -- Now that the main unit is installed, we can complete the analysis
332 -- of the pragmas in gnat.adc and the configuration file, that require
333 -- a context for their semantic processing.
335 if Config_Pragmas
/= Error_List
336 and then Operating_Mode
/= Check_Syntax
338 -- Do not attempt to process deferred configuration pragmas if the main
339 -- unit failed to load, to avoid cascaded inconsistencies that can lead
340 -- to a compiler crash.
342 and then Fatal_Error
(Main_Unit
) /= Error_Detected
344 -- Pragmas that require some semantic activity, such as Interrupt_State,
345 -- cannot be processed until the main unit is installed, because they
346 -- require a compilation unit on which to attach with_clauses, etc. So
353 Prag
:= First
(Config_Pragmas
);
354 while Present
(Prag
) loop
356 -- Guard against the case where a configuration pragma may be
357 -- split into multiple pragmas and the original rewritten as a
360 if Nkind
(Prag
) = N_Pragma
361 and then Delay_Config_Pragma_Analyze
(Prag
)
363 Analyze_Pragma
(Prag
);
371 -- If we have restriction No_Exception_Propagation, and we did not have an
372 -- explicit switch turning off Warn_On_Non_Local_Exception, then turn on
373 -- this warning by default if we have encountered an exception handler.
375 if Restriction_Check_Required
(No_Exception_Propagation
)
376 and then not No_Warn_On_Non_Local_Exception
377 and then Exception_Handler_Encountered
379 Warn_On_Non_Local_Exception
:= True;
382 -- Now on to the semantics. Skip if in syntax only mode
384 if Operating_Mode
/= Check_Syntax
then
386 -- Install the configuration pragmas in the tree
388 Set_Config_Pragmas
(Aux_Decls_Node
(Cunit
(Main_Unit
)), Config_Pragmas
);
390 -- Following steps are skipped if we had a fatal error during parsing
392 if Fatal_Error
(Main_Unit
) /= Error_Detected
then
394 -- Reset Operating_Mode to Check_Semantics for subunits. We cannot
395 -- actually generate code for subunits, so we suppress expansion.
396 -- This also corrects certain problems that occur if we try to
397 -- incorporate subunits at a lower level.
399 if Operating_Mode
= Generate_Code
400 and then Nkind
(Unit
(Cunit
(Main_Unit
))) = N_Subunit
402 Operating_Mode
:= Check_Semantics
;
405 -- Analyze (and possibly expand) main unit
407 Scope_Suppress
:= Suppress_Options
;
408 Semantics
(Cunit
(Main_Unit
));
410 -- Cleanup processing after completing main analysis
412 -- Comment needed for ASIS mode test and GNATprove mode test???
414 if Operating_Mode
= Generate_Code
415 or else (Operating_Mode
= Check_Semantics
416 and then (ASIS_Mode
or GNATprove_Mode
))
421 if Operating_Mode
= Generate_Code
then
422 if Inline_Processing_Required
then
423 Analyze_Inlined_Bodies
;
426 -- Remove entities from program that do not have any execution
429 if Debug_Flag_UU
then
430 Collect_Garbage_Entities
;
435 -- Remove any ignored Ghost code as it must not appear in the
438 Remove_Ignored_Ghost_Code
;
441 -- At this stage we can unnest subprogram bodies if required
443 Exp_Ch6
.Unnest_Subprograms
;
445 -- List library units if requested
451 -- Output waiting warning messages
453 Lib
.Xref
.Process_Deferred_References
;
454 Sem_Warn
.Output_Non_Modified_In_Out_Warnings
;
455 Sem_Warn
.Output_Unreferenced_Messages
;
456 Sem_Warn
.Check_Unused_Withs
;
457 Sem_Warn
.Output_Unused_Warnings_Off_Warnings
;
461 -- Qualify all entity names in inner packages, package bodies, etc.
463 Exp_Dbug
.Qualify_All_Entity_Names
;
465 -- SCIL backend requirement. Check that SCIL nodes associated with
466 -- dispatching calls reference subprogram calls.
468 if Generate_SCIL
then
469 pragma Debug
(Sem_SCIL
.Check_SCIL_Nodes
(Cunit
(Main_Unit
)));
473 -- Dump the source now. Note that we do this as soon as the analysis
474 -- of the tree is complete, because it is not just a dump in the case
475 -- of -gnatD, where it rewrites all source locations in the tree.
479 -- Check again for configuration pragmas that appear in the context
480 -- of the main unit. These pragmas only affect the main unit, and the
481 -- corresponding flag is reset after each call to Semantics, but they
482 -- may affect the generated ali for the unit, and therefore the flag
483 -- must be set properly after compilation. Currently we only check for
484 -- Initialize_Scalars, but others should be checked: as well???
490 Item
:= First
(Context_Items
(Cunit
(Main_Unit
)));
491 while Present
(Item
) loop
492 if Nkind
(Item
) = N_Pragma
493 and then Pragma_Name
(Item
) = Name_Initialize_Scalars
495 Initialize_Scalars
:= True;
502 -- If a mapping file has been specified by a -gnatem switch, update
503 -- it if there has been some sources that were not in the mappings.
505 if Mapping_File_Name
/= null then
506 Fmap
.Update_Mapping_File
(Mapping_File_Name
.all);