1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2013, 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
;
39 with Lib
.Xref
; use Lib
.Xref
;
41 with Namet
; use Namet
;
42 with Nlists
; use Nlists
;
48 with Restrict
; use Restrict
;
49 with Rident
; use Rident
;
50 with Rtsfind
; use Rtsfind
;
51 with Snames
; use Snames
;
56 with Sem_Ch8
; use Sem_Ch8
;
58 with Sem_Elab
; use Sem_Elab
;
59 with Sem_Prag
; use Sem_Prag
;
60 with Sem_VFpt
; use Sem_VFpt
;
61 with Sem_Warn
; use Sem_Warn
;
62 with Sinfo
; use Sinfo
;
63 with Sinput
; use Sinput
;
64 with Sinput
.L
; use Sinput
.L
;
65 with SCIL_LL
; use SCIL_LL
;
66 with Targparm
; use Targparm
;
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
149 -- We always analyze config files with style checks off, since
150 -- we don't want a miscellaneous gnat.adc that is around to
151 -- discombobulate intended -gnatg or -gnaty compilations. We
152 -- also disconnect checking for maximum line length.
154 Opt
.Style_Check
:= False;
155 Style_Check
:= False;
157 -- Capture current suppress options, which may get modified
159 Scope_Suppress
:= Opt
.Suppress_Options
;
161 -- First deal with gnat.adc file
163 if Opt
.Config_File
then
164 Name_Buffer
(1 .. 8) := "gnat.adc";
166 Source_gnat_adc
:= Load_Config_File
(Name_Enter
);
168 if Source_gnat_adc
/= No_Source_File
then
169 Initialize_Scanner
(No_Unit
, Source_gnat_adc
);
170 Config_Pragmas
:= Par
(Configuration_Pragmas
=> True);
172 Config_Pragmas
:= Empty_List
;
176 Config_Pragmas
:= Empty_List
;
179 -- Check for VAX Float
181 if Targparm
.VAX_Float_On_Target
then
183 -- pragma Float_Representation (VAX_Float);
185 Opt
.Float_Format
:= 'V';
187 -- pragma Long_Float (G_Float);
189 Opt
.Float_Format_Long
:= 'G';
191 Set_Standard_Fpt_Formats
;
194 -- Now deal with specified config pragmas files if there are any
196 if Opt
.Config_File_Names
/= null then
197 for Index
in Opt
.Config_File_Names
'Range loop
198 Name_Len
:= Config_File_Names
(Index
)'Length;
199 Name_Buffer
(1 .. Name_Len
) := Config_File_Names
(Index
).all;
200 Source_Config_File
:= Load_Config_File
(Name_Enter
);
202 if Source_Config_File
= No_Source_File
then
204 ("cannot find configuration pragmas file "
205 & Config_File_Names
(Index
).all);
208 Initialize_Scanner
(No_Unit
, Source_Config_File
);
210 (Config_Pragmas
, Par
(Configuration_Pragmas
=> True));
214 -- Now analyze all pragmas except those whose analysis must be
215 -- deferred till after the main unit is analyzed.
217 if Config_Pragmas
/= Error_List
218 and then Operating_Mode
/= Check_Syntax
220 Prag
:= First
(Config_Pragmas
);
221 while Present
(Prag
) loop
222 if not Delay_Config_Pragma_Analyze
(Prag
) then
223 Analyze_Pragma
(Prag
);
230 -- Restore style check, but if config file turned on checks, leave on
232 Opt
.Style_Check
:= Save_Style_Check
or Style_Check
;
234 -- Capture any modifications to suppress options from config pragmas
236 Opt
.Suppress_Options
:= Scope_Suppress
;
239 -- This is where we can capture the value of the compilation unit specific
240 -- restrictions that have been set by the config pragma files (or from
241 -- Targparm), for later restoration when processing e.g. subunits.
243 Save_Config_Cunit_Boolean_Restrictions
;
245 -- If there was a -gnatem switch, initialize the mappings of unit names to
246 -- file names and of file names to path names from the mapping file.
248 if Mapping_File_Name
/= null then
249 Fmap
.Initialize
(Mapping_File_Name
.all);
252 -- Adjust Optimize_Alignment mode from debug switches if necessary
254 if Debug_Flag_Dot_SS
then
255 Optimize_Alignment
:= 'S';
256 elsif Debug_Flag_Dot_TT
then
257 Optimize_Alignment
:= 'T';
260 -- We have now processed the command line switches, and the configuration
261 -- pragma files, so this is the point at which we want to capture the
262 -- values of the configuration switches (see Opt for further details).
264 Opt
.Register_Opt_Config_Switches
;
266 -- Check for file which contains No_Body pragma
268 if Source_File_Is_No_Body
(Source_Index
(Main_Unit
)) then
269 Change_Main_Unit_To_Spec
;
272 -- Initialize the scanner. Note that we do this after the call to
273 -- Create_Standard, which uses the scanner in its processing of
274 -- floating-point bounds.
276 Initialize_Scanner
(Main_Unit
, Source_Index
(Main_Unit
));
278 -- Here we call the parser to parse the compilation unit (or units in
279 -- the check syntax mode, but in that case we won't go on to the
280 -- semantics in any case).
282 Discard_List
(Par
(Configuration_Pragmas
=> False));
283 Parsing_Main_Extended_Source
:= False;
285 -- The main unit is now loaded, and subunits of it can be loaded,
286 -- without reporting spurious loading circularities.
288 Set_Loading
(Main_Unit
, False);
290 -- Now that the main unit is installed, we can complete the analysis
291 -- of the pragmas in gnat.adc and the configuration file, that require
292 -- a context for their semantic processing.
294 if Config_Pragmas
/= Error_List
295 and then Operating_Mode
/= Check_Syntax
297 -- Do not attempt to process deferred configuration pragmas if the main
298 -- unit failed to load, to avoid cascaded inconsistencies that can lead
299 -- to a compiler crash.
301 and then not Fatal_Error
(Main_Unit
)
303 -- Pragmas that require some semantic activity, such as
304 -- Interrupt_State, cannot be processed until the main unit
305 -- is installed, because they require a compilation unit on
306 -- which to attach with_clauses, etc. So analyze them now.
312 Prag
:= First
(Config_Pragmas
);
313 while Present
(Prag
) loop
314 if Delay_Config_Pragma_Analyze
(Prag
) then
315 Analyze_Pragma
(Prag
);
323 -- If we have restriction No_Exception_Propagation, and we did not have an
324 -- explicit switch turning off Warn_On_Non_Local_Exception, then turn on
325 -- this warning by default if we have encountered an exception handler.
327 if Restriction_Check_Required
(No_Exception_Propagation
)
328 and then not No_Warn_On_Non_Local_Exception
329 and then Exception_Handler_Encountered
331 Warn_On_Non_Local_Exception
:= True;
334 -- Now on to the semantics. Skip if in syntax only mode
336 if Operating_Mode
/= Check_Syntax
then
338 -- Install the configuration pragmas in the tree
340 Set_Config_Pragmas
(Aux_Decls_Node
(Cunit
(Main_Unit
)), Config_Pragmas
);
342 -- Following steps are skipped if we had a fatal error during parsing
344 if not Fatal_Error
(Main_Unit
) then
346 -- Reset Operating_Mode to Check_Semantics for subunits. We cannot
347 -- actually generate code for subunits, so we suppress expansion.
348 -- This also corrects certain problems that occur if we try to
349 -- incorporate subunits at a lower level.
351 if Operating_Mode
= Generate_Code
352 and then Nkind
(Unit
(Cunit
(Main_Unit
))) = N_Subunit
354 Operating_Mode
:= Check_Semantics
;
357 -- Analyze (and possibly expand) main unit
359 Scope_Suppress
:= Suppress_Options
;
360 Semantics
(Cunit
(Main_Unit
));
362 -- Cleanup processing after completing main analysis
364 -- Comment needed for ASIS mode test and GNATprove mode test???
366 if Operating_Mode
= Generate_Code
367 or else (Operating_Mode
= Check_Semantics
368 and then (ASIS_Mode
or GNATprove_Mode
))
373 if Operating_Mode
= Generate_Code
then
374 if Inline_Processing_Required
then
375 Analyze_Inlined_Bodies
;
378 -- Remove entities from program that do not have any
379 -- execution time references.
381 if Debug_Flag_UU
then
382 Collect_Garbage_Entities
;
388 -- List library units if requested
394 -- Output waiting warning messages
396 Lib
.Xref
.Process_Deferred_References
;
397 Sem_Warn
.Output_Non_Modified_In_Out_Warnings
;
398 Sem_Warn
.Output_Unreferenced_Messages
;
399 Sem_Warn
.Check_Unused_Withs
;
400 Sem_Warn
.Output_Unused_Warnings_Off_Warnings
;
404 -- Qualify all entity names in inner packages, package bodies, etc.,
405 -- except when compiling for the VM back-ends, which depend on having
406 -- unqualified names in certain cases and handles the generation of
407 -- qualified names when needed.
409 if VM_Target
= No_VM
then
410 Exp_Dbug
.Qualify_All_Entity_Names
;
413 -- SCIL backend requirement. Check that SCIL nodes associated with
414 -- dispatching calls reference subprogram calls.
416 if Generate_SCIL
then
417 pragma Debug
(Sem_SCIL
.Check_SCIL_Nodes
(Cunit
(Main_Unit
)));
421 -- Dump the source now. Note that we do this as soon as the analysis
422 -- of the tree is complete, because it is not just a dump in the case
423 -- of -gnatD, where it rewrites all source locations in the tree.
427 -- Check again for configuration pragmas that appear in the context of
428 -- the main unit. These pragmas only affect the main unit, and the
429 -- corresponding flag is reset after each call to Semantics, but they
430 -- may affect the generated ali for the unit, and therefore the flag
431 -- must be set properly after compilation. Currently we only check for
432 -- Initialize_Scalars, but others should be checked: as well???
438 Item
:= First
(Context_Items
(Cunit
(Main_Unit
)));
439 while Present
(Item
) loop
440 if Nkind
(Item
) = N_Pragma
441 and then Pragma_Name
(Item
) = Name_Initialize_Scalars
443 Initialize_Scalars
:= True;
450 -- If a mapping file has been specified by a -gnatem switch, update
451 -- it if there has been some sources that were not in the mappings.
453 if Mapping_File_Name
/= null then
454 Fmap
.Update_Mapping_File
(Mapping_File_Name
.all);