1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2009, 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
;
47 with Restrict
; use Restrict
;
48 with Rident
; use Rident
;
49 with Rtsfind
; use Rtsfind
;
50 with Snames
; use Snames
;
55 with Sem_Ch8
; use Sem_Ch8
;
57 with Sem_Elab
; use Sem_Elab
;
58 with Sem_Prag
; use Sem_Prag
;
59 with Sem_Warn
; use Sem_Warn
;
60 with Sinfo
; use Sinfo
;
61 with Sinput
; use Sinput
;
62 with Sinput
.L
; use Sinput
.L
;
63 with Targparm
; use Targparm
;
64 with Tbuild
; use Tbuild
;
65 with Types
; use Types
;
68 Config_Pragmas
: List_Id
;
69 -- Gather configuration pragmas
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.
92 -- Create package Standard
94 CStand
.Create_Standard
;
96 -- Check possible symbol definitions specified by -gnateD switches
98 Prepcomp
.Process_Command_Line_Symbol_Definitions
;
100 -- If -gnatep= was specified, parse the preprocessing data file
102 if Preprocessing_Data_File
/= null then
103 Name_Len
:= Preprocessing_Data_File
'Length;
104 Name_Buffer
(1 .. Name_Len
) := Preprocessing_Data_File
.all;
105 Prepcomp
.Parse_Preprocessing_Data_File
(Name_Find
);
107 -- Otherwise, check if there were preprocessing symbols on the command
108 -- line and set preprocessing if there are.
111 Prepcomp
.Check_Symbols
;
114 -- Now that the preprocessing situation is established, we are able to
115 -- load the main source (this is no longer done by Lib.Load.Initialize).
117 Lib
.Load
.Load_Main_Source
;
119 -- Return immediately if the main source could not be parsed
121 if Sinput
.Main_Source_File
= No_Source_File
then
125 -- Read and process configuration pragma files if present
128 Save_Style_Check
: constant Boolean := Opt
.Style_Check
;
129 -- Save style check mode so it can be restored later
131 Source_Config_File
: Source_File_Index
;
132 -- Source reference for -gnatec configuration file
137 -- We always analyze config files with style checks off, since
138 -- we don't want a miscellaneous gnat.adc that is around to
139 -- discombobulate intended -gnatg or -gnaty compilations. We
140 -- also disconnect checking for maximum line length.
142 Opt
.Style_Check
:= False;
143 Style_Check
:= False;
145 -- Capture current suppress options, which may get modified
147 Scope_Suppress
:= Opt
.Suppress_Options
;
149 -- First deal with gnat.adc file
151 if Opt
.Config_File
then
152 Name_Buffer
(1 .. 8) := "gnat.adc";
154 Source_gnat_adc
:= Load_Config_File
(Name_Enter
);
156 if Source_gnat_adc
/= No_Source_File
then
157 Initialize_Scanner
(No_Unit
, Source_gnat_adc
);
158 Config_Pragmas
:= Par
(Configuration_Pragmas
=> True);
161 Config_Pragmas
:= Empty_List
;
165 Config_Pragmas
:= Empty_List
;
168 -- Now deal with specified config pragmas files if there are any
170 if Opt
.Config_File_Names
/= null then
171 for Index
in Opt
.Config_File_Names
'Range loop
172 Name_Len
:= Config_File_Names
(Index
)'Length;
173 Name_Buffer
(1 .. Name_Len
) := Config_File_Names
(Index
).all;
174 Source_Config_File
:= Load_Config_File
(Name_Enter
);
176 if Source_Config_File
= No_Source_File
then
178 ("cannot find configuration pragmas file "
179 & Config_File_Names
(Index
).all);
182 Initialize_Scanner
(No_Unit
, Source_Config_File
);
184 (Config_Pragmas
, Par
(Configuration_Pragmas
=> True));
188 -- Now analyze all pragmas except those whose analysis must be
189 -- deferred till after the main unit is analyzed.
191 if Config_Pragmas
/= Error_List
192 and then Operating_Mode
/= Check_Syntax
194 Prag
:= First
(Config_Pragmas
);
195 while Present
(Prag
) loop
196 if not Delay_Config_Pragma_Analyze
(Prag
) then
197 Analyze_Pragma
(Prag
);
204 -- Restore style check, but if config file turned on checks, leave on!
206 Opt
.Style_Check
:= Save_Style_Check
or Style_Check
;
208 -- Capture any modifications to suppress options from config pragmas
210 Opt
.Suppress_Options
:= Scope_Suppress
;
213 -- If there was a -gnatem switch, initialize the mappings of unit names to
214 -- file names and of file names to path names from the mapping file.
216 if Mapping_File_Name
/= null then
217 Fmap
.Initialize
(Mapping_File_Name
.all);
220 -- Adjust Optimize_Alignment mode from debug switches if necessary
222 if Debug_Flag_Dot_SS
then
223 Optimize_Alignment
:= 'S';
224 elsif Debug_Flag_Dot_TT
then
225 Optimize_Alignment
:= 'T';
228 -- We have now processed the command line switches, and the gnat.adc
229 -- file, so this is the point at which we want to capture the values
230 -- of the configuration switches (see Opt for further details).
232 Opt
.Register_Opt_Config_Switches
;
234 -- Check for file which contains No_Body pragma
236 if Source_File_Is_No_Body
(Source_Index
(Main_Unit
)) then
237 Change_Main_Unit_To_Spec
;
240 -- Initialize the scanner. Note that we do this after the call to
241 -- Create_Standard, which uses the scanner in its processing of
242 -- floating-point bounds.
244 Initialize_Scanner
(Main_Unit
, Source_Index
(Main_Unit
));
246 -- Here we call the parser to parse the compilation unit (or units in
247 -- the check syntax mode, but in that case we won't go on to the
248 -- semantics in any case).
250 Discard_List
(Par
(Configuration_Pragmas
=> False));
252 -- The main unit is now loaded, and subunits of it can be loaded,
253 -- without reporting spurious loading circularities.
255 Set_Loading
(Main_Unit
, False);
257 -- Now that the main unit is installed, we can complete the analysis
258 -- of the pragmas in gnat.adc and the configuration file, that require
259 -- a context for their semantic processing.
261 if Config_Pragmas
/= Error_List
262 and then Operating_Mode
/= Check_Syntax
264 -- Pragmas that require some semantic activity, such as
265 -- Interrupt_State, cannot be processed until the main unit
266 -- is installed, because they require a compilation unit on
267 -- which to attach with_clauses, etc. So analyze them now.
273 Prag
:= First
(Config_Pragmas
);
274 while Present
(Prag
) loop
275 if Delay_Config_Pragma_Analyze
(Prag
) then
276 Analyze_Pragma
(Prag
);
284 -- If we have restriction No_Exception_Propagation, and we did not have an
285 -- explicit switch turning off Warn_On_Non_Local_Exception, then turn on
286 -- this warning by default if we have encountered an exception handler.
288 if Restriction_Active
(No_Exception_Propagation
)
289 and then not No_Warn_On_Non_Local_Exception
290 and then Exception_Handler_Encountered
292 Warn_On_Non_Local_Exception
:= True;
295 -- Now on to the semantics. Skip if in syntax only mode
297 if Operating_Mode
/= Check_Syntax
then
299 -- Install the configuration pragmas in the tree
301 Set_Config_Pragmas
(Aux_Decls_Node
(Cunit
(Main_Unit
)), Config_Pragmas
);
303 -- Following steps are skipped if we had a fatal error during parsing
305 if not Fatal_Error
(Main_Unit
) then
307 -- Reset Operating_Mode to Check_Semantics for subunits. We cannot
308 -- actually generate code for subunits, so we suppress expansion.
309 -- This also corrects certain problems that occur if we try to
310 -- incorporate subunits at a lower level.
312 if Operating_Mode
= Generate_Code
313 and then Nkind
(Unit
(Cunit
(Main_Unit
))) = N_Subunit
315 Operating_Mode
:= Check_Semantics
;
318 -- Analyze (and possibly expand) main unit
320 Scope_Suppress
:= Suppress_Options
;
321 Semantics
(Cunit
(Main_Unit
));
323 -- Cleanup processing after completing main analysis
325 if Operating_Mode
= Generate_Code
326 or else (Operating_Mode
= Check_Semantics
332 if Operating_Mode
= Generate_Code
then
333 if Inline_Processing_Required
then
334 Analyze_Inlined_Bodies
;
337 -- Remove entities from program that do not have any
338 -- execution time references.
340 if Debug_Flag_UU
then
341 Collect_Garbage_Entities
;
347 -- List library units if requested
353 -- Output waiting warning messages
355 Sem_Warn
.Output_Non_Modified_In_Out_Warnings
;
356 Sem_Warn
.Output_Unreferenced_Messages
;
357 Sem_Warn
.Check_Unused_Withs
;
358 Sem_Warn
.Output_Unused_Warnings_Off_Warnings
;
362 -- Qualify all entity names in inner packages, package bodies, etc.,
363 -- except when compiling for the VM back-ends, which depend on
364 -- having unqualified names in certain cases and handles the
365 -- generation of qualified names when needed.
367 if VM_Target
= No_VM
then
368 Exp_Dbug
.Qualify_All_Entity_Names
;
371 -- SCIL backend requirement. Check that SCIL nodes associated with
372 -- dispatching calls reference subprogram calls.
374 if Generate_SCIL
then
375 pragma Debug
(Sem_SCIL
.Check_SCIL_Nodes
(Cunit
(Main_Unit
)));
379 -- Dump the source now. Note that we do this as soon as the analysis
380 -- of the tree is complete, because it is not just a dump in the case
381 -- of -gnatD, where it rewrites all source locations in the tree.
385 -- Check again for configuration pragmas that appear in the context of
386 -- the main unit. These pragmas only affect the main unit, and the
387 -- corresponding flag is reset after each call to Semantics, but they
388 -- may affect the generated ali for the unit, and therefore the flag
389 -- must be set properly after compilation. Currently we only check for
390 -- Initialize_Scalars, but others should be checked: as well???
396 Item
:= First
(Context_Items
(Cunit
(Main_Unit
)));
397 while Present
(Item
) loop
398 if Nkind
(Item
) = N_Pragma
399 and then Pragma_Name
(Item
) = Name_Initialize_Scalars
401 Initialize_Scalars
:= True;
408 -- If a mapping file has been specified by a -gnatem switch, update
409 -- it if there has been some sources that were not in the mappings.
411 if Mapping_File_Name
/= null then
412 Fmap
.Update_Mapping_File
(Mapping_File_Name
.all);