1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2017, 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
;
43 with Namet
; use Namet
;
44 with Nlists
; use Nlists
;
50 with Restrict
; use Restrict
;
51 with Rident
; use Rident
;
53 with Snames
; use Snames
;
60 with Sem_Elab
; use Sem_Elab
;
61 with Sem_Prag
; use Sem_Prag
;
63 with Sinfo
; use Sinfo
;
64 with Sinput
; use Sinput
;
65 with Sinput
.L
; use Sinput
.L
;
67 with Tbuild
; use Tbuild
;
68 with Types
; use Types
;
72 -- Carry out package initializations. These are initializations which might
73 -- logically be performed at elaboration time, were it not for the fact
74 -- that we may be doing things more than once in the big loop over files.
75 -- Like elaboration, the order in which these calls are made is in some
76 -- cases important. For example, Lib cannot be initialized before Namet,
77 -- since it uses names table entries.
95 -- Create package Standard
97 CStand
.Create_Standard
;
99 -- Check possible symbol definitions specified by -gnateD switches
101 Prepcomp
.Process_Command_Line_Symbol_Definitions
;
103 -- If -gnatep= was specified, parse the preprocessing data file
105 if Preprocessing_Data_File
/= null then
106 Name_Len
:= Preprocessing_Data_File
'Length;
107 Name_Buffer
(1 .. Name_Len
) := Preprocessing_Data_File
.all;
108 Prepcomp
.Parse_Preprocessing_Data_File
(Name_Find
);
110 -- Otherwise, check if there were preprocessing symbols on the command
111 -- line and set preprocessing if there are.
114 Prepcomp
.Check_Symbols
;
117 -- We set Parsing_Main_Extended_Source true here to cover processing of all
118 -- the configuration pragma files, as well as the main source unit itself.
120 Parsing_Main_Extended_Source
:= True;
122 -- Now that the preprocessing situation is established, we are able to
123 -- load the main source (this is no longer done by Lib.Load.Initialize).
125 Lib
.Load
.Load_Main_Source
;
127 -- Return immediately if the main source could not be found
129 if Sinput
.Main_Source_File
<= No_Source_File
then
133 -- Read and process configuration pragma files if present
136 Dot_Gnat_Adc
: constant File_Name_Type
:= Name_Find
("./gnat.adc");
137 Gnat_Adc
: constant File_Name_Type
:= Name_Find
("gnat.adc");
139 Save_Style_Check
: constant Boolean := Opt
.Style_Check
;
140 -- Save style check mode so it can be restored later
142 Config_Pragmas
: List_Id
:= Empty_List
;
143 -- Gather configuration pragmas
145 Source_Config_File
: Source_File_Index
;
146 -- 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 Source_gnat_adc
:= Load_Config_File
(Gnat_Adc
);
168 -- Case of gnat.adc file present
170 if Source_gnat_adc
> No_Source_File
then
171 -- Parse the gnat.adc file for configuration pragmas
173 Initialize_Scanner
(No_Unit
, Source_gnat_adc
);
174 Config_Pragmas
:= Par
(Configuration_Pragmas
=> True);
176 -- We add a compilation dependency for gnat.adc so that if it
177 -- changes, we force a recompilation.
179 Prepcomp
.Add_Dependency
(Source_gnat_adc
);
183 -- Now deal with specified config pragmas files if there are any
185 if Opt
.Config_File_Names
/= null then
187 -- Loop through config pragmas files
189 for Index
in Opt
.Config_File_Names
'Range loop
191 Len
: constant Natural := Config_File_Names
(Index
)'Length;
192 Str
: constant String (1 .. Len
) :=
193 Config_File_Names
(Index
).all;
195 Config_Name
: constant File_Name_Type
:= Name_Find
(Str
);
196 Temp_File
: constant Boolean :=
199 (Str
(Len
- 3 .. Len
) = ".TMP"
201 Str
(Len
- 3 .. Len
) = ".tmp");
202 -- Extension indicating a temporary config file?
205 -- Skip it if it's the default name, already loaded above.
206 -- Otherwise, we get confusing warning messages about seeing
207 -- the same thing twice.
209 if Config_Name
/= Gnat_Adc
210 and then Config_Name
/= Dot_Gnat_Adc
212 -- Load the file, error if we did not find it
214 Source_Config_File
:= Load_Config_File
(Config_Name
);
216 if Source_Config_File
<= No_Source_File
then
218 ("cannot find configuration pragmas file "
219 & Config_File_Names
(Index
).all);
221 -- If we did find the file, and it is not a temporary file,
222 -- then we add a compilation dependency for it so that if it
223 -- changes, we force a recompilation.
225 elsif not Temp_File
then
226 Prepcomp
.Add_Dependency
(Source_Config_File
);
229 -- Parse the config pragmas file, and accumulate results
231 Initialize_Scanner
(No_Unit
, Source_Config_File
);
233 (Config_Pragmas
, Par
(Configuration_Pragmas
=> True));
239 -- Now analyze all pragmas except those whose analysis must be
240 -- deferred till after the main unit is analyzed.
242 if Config_Pragmas
/= Error_List
243 and then Operating_Mode
/= Check_Syntax
245 Prag
:= First
(Config_Pragmas
);
246 while Present
(Prag
) loop
247 if not Delay_Config_Pragma_Analyze
(Prag
) then
248 Analyze_Pragma
(Prag
);
255 -- Restore style check, but if config file turned on checks, leave on
257 Opt
.Style_Check
:= Save_Style_Check
or Style_Check
;
259 -- Capture any modifications to suppress options from config pragmas
261 Opt
.Suppress_Options
:= Scope_Suppress
;
263 -- If a target dependency info file has been read through switch
264 -- -gnateT=, add it to the dependencies.
266 if Target_Dependent_Info_Read_Name
/= null then
268 Index
: Source_File_Index
;
271 Add_Str_To_Name_Buffer
(Target_Dependent_Info_Read_Name
.all);
272 Index
:= Load_Config_File
(Name_Enter
);
273 Prepcomp
.Add_Dependency
(Index
);
277 -- This is where we can capture the value of the compilation unit
278 -- specific restrictions that have been set by the config pragma
279 -- files (or from Targparm), for later restoration when processing
282 Save_Config_Cunit_Boolean_Restrictions
;
284 -- If there was a -gnatem switch, initialize the mappings of unit names
285 -- to file names and of file names to path names from the mapping file.
287 if Mapping_File_Name
/= null then
288 Fmap
.Initialize
(Mapping_File_Name
.all);
291 -- Adjust Optimize_Alignment mode from debug switches if necessary
293 if Debug_Flag_Dot_SS
then
294 Optimize_Alignment
:= 'S';
295 elsif Debug_Flag_Dot_TT
then
296 Optimize_Alignment
:= 'T';
299 -- We have now processed the command line switches, and the
300 -- configuration pragma files, so this is the point at which we want to
301 -- capture the values of the configuration switches (see Opt for further
304 Opt
.Register_Opt_Config_Switches
;
306 -- Check for file which contains No_Body pragma
308 if Source_File_Is_No_Body
(Source_Index
(Main_Unit
)) then
309 Change_Main_Unit_To_Spec
;
312 -- Initialize the scanner. Note that we do this after the call to
313 -- Create_Standard, which uses the scanner in its processing of
314 -- floating-point bounds.
316 Initialize_Scanner
(Main_Unit
, Source_Index
(Main_Unit
));
318 -- Here we call the parser to parse the compilation unit (or units in
319 -- the check syntax mode, but in that case we won't go on to the
320 -- semantics in any case).
322 Discard_List
(Par
(Configuration_Pragmas
=> False));
323 Parsing_Main_Extended_Source
:= False;
325 -- The main unit is now loaded, and subunits of it can be loaded,
326 -- without reporting spurious loading circularities.
328 Set_Loading
(Main_Unit
, False);
330 -- Now that the main unit is installed, we can complete the analysis
331 -- of the pragmas in gnat.adc and the configuration file, that require
332 -- a context for their semantic processing.
334 if Config_Pragmas
/= Error_List
335 and then Operating_Mode
/= Check_Syntax
337 -- Do not attempt to process deferred configuration pragmas if the
338 -- main unit failed to load, to avoid cascaded inconsistencies that
339 -- can lead to a compiler crash.
341 and then Fatal_Error
(Main_Unit
) /= Error_Detected
343 -- Pragmas that require some semantic activity, such as
344 -- Interrupt_State, cannot be processed until the main unit is
345 -- installed, because they require a compilation unit on which to
346 -- attach with_clauses, etc. So analyze them now.
352 Prag
:= First
(Config_Pragmas
);
353 while Present
(Prag
) loop
355 -- Guard against the case where a configuration pragma may be
356 -- split into multiple pragmas and the original rewritten as a
359 if Nkind
(Prag
) = N_Pragma
360 and then Delay_Config_Pragma_Analyze
(Prag
)
362 Analyze_Pragma
(Prag
);
370 -- If we have restriction No_Exception_Propagation, and we did not have
371 -- an explicit switch turning off Warn_On_Non_Local_Exception, then turn
372 -- on this warning by default if we have encountered an exception
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
389 (Aux_Decls_Node
(Cunit
(Main_Unit
)), Config_Pragmas
);
391 -- Following steps are skipped if we had a fatal error during parsing
393 if Fatal_Error
(Main_Unit
) /= Error_Detected
then
395 -- Reset Operating_Mode to Check_Semantics for subunits. We cannot
396 -- actually generate code for subunits, so we suppress expansion.
397 -- This also corrects certain problems that occur if we try to
398 -- incorporate subunits at a lower level.
400 if Operating_Mode
= Generate_Code
401 and then Nkind
(Unit
(Cunit
(Main_Unit
))) = N_Subunit
403 Operating_Mode
:= Check_Semantics
;
406 -- Analyze (and possibly expand) main unit
408 Scope_Suppress
:= Suppress_Options
;
409 Semantics
(Cunit
(Main_Unit
));
411 -- Cleanup processing after completing main analysis
413 -- Comment needed for ASIS mode test and GNATprove mode test???
416 (Operating_Mode
= Generate_Code
417 or else Operating_Mode
= Check_Semantics
);
419 if Operating_Mode
= Generate_Code
420 or else (ASIS_Mode
or GNATprove_Mode
)
425 -- Analyze inlined bodies and check elaboration rules in GNATprove
426 -- mode as well as during compilation.
428 if Operating_Mode
= Generate_Code
or else GNATprove_Mode
then
429 if Inline_Processing_Required
then
430 Analyze_Inlined_Bodies
;
433 -- Remove entities from program that do not have any execution
436 if Debug_Flag_UU
then
437 Collect_Garbage_Entities
;
442 -- Remove any ignored Ghost code as it must not appear in the
445 Remove_Ignored_Ghost_Code
;
448 -- At this stage we can unnest subprogram bodies if required
450 Exp_Unst
.Unnest_Subprograms
(Cunit
(Main_Unit
));
452 -- List library units if requested
458 -- Output waiting warning messages
460 Lib
.Xref
.Process_Deferred_References
;
461 Sem_Warn
.Output_Non_Modified_In_Out_Warnings
;
462 Sem_Warn
.Output_Unreferenced_Messages
;
463 Sem_Warn
.Check_Unused_Withs
;
464 Sem_Warn
.Output_Unused_Warnings_Off_Warnings
;
469 -- Qualify all entity names in inner packages, package bodies, etc
471 Exp_Dbug
.Qualify_All_Entity_Names
;
473 -- SCIL backend requirement. Check that SCIL nodes associated with
474 -- dispatching calls reference subprogram calls.
476 if Generate_SCIL
then
477 pragma Debug
(Sem_SCIL
.Check_SCIL_Nodes
(Cunit
(Main_Unit
)));
481 -- Dump the source now. Note that we do this as soon as the analysis
482 -- of the tree is complete, because it is not just a dump in the case
483 -- of -gnatD, where it rewrites all source locations in the tree.
487 -- Check again for configuration pragmas that appear in the context
488 -- of the main unit. These pragmas only affect the main unit, and the
489 -- corresponding flag is reset after each call to Semantics, but they
490 -- may affect the generated ali for the unit, and therefore the flag
491 -- must be set properly after compilation. Currently we only check for
492 -- Initialize_Scalars, but others should be checked: as well???
498 Item
:= First
(Context_Items
(Cunit
(Main_Unit
)));
499 while Present
(Item
) loop
500 if Nkind
(Item
) = N_Pragma
501 and then Pragma_Name
(Item
) = Name_Initialize_Scalars
503 Initialize_Scalars
:= True;
510 -- If a mapping file has been specified by a -gnatem switch, update
511 -- it if there has been some sources that were not in the mappings.
513 if Mapping_File_Name
/= null then
514 Fmap
.Update_Mapping_File
(Mapping_File_Name
.all);