1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2006 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 2, 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 COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- GNAT was originally developed by the GNAT team at New York University. --
23 -- Extensive contributions were provided by Ada Core Technologies Inc. --
25 ------------------------------------------------------------------------------
27 with Atree
; use Atree
;
28 with Back_End
; use Back_End
;
30 with Csets
; use Csets
;
31 with Debug
; use Debug
;
33 with Errout
; use Errout
;
35 with Fname
; use Fname
;
36 with Fname
.UF
; use Fname
.UF
;
38 with Gnatvsn
; use Gnatvsn
;
42 with Lib
.Writ
; use Lib
.Writ
;
44 with Namet
; use Namet
;
47 with Osint
; use Osint
;
48 with Output
; use Output
;
50 with Repinfo
; use Repinfo
;
59 with Sinfo
; use Sinfo
;
60 with Sinput
.L
; use Sinput
.L
;
62 with Sprint
; use Sprint
;
66 with Treepr
; use Treepr
;
68 with Types
; use Types
;
69 with Uintp
; use Uintp
;
70 with Uname
; use Uname
;
74 with System
.Assertions
;
77 Main_Unit_Node
: Node_Id
;
78 -- Compilation unit node for main unit
80 Main_Kind
: Node_Kind
;
81 -- Kind of main compilation unit node
83 Back_End_Mode
: Back_End
.Back_End_Mode_Type
;
84 -- Record back end mode
87 -- This inner block is set up to catch assertion errors and constraint
88 -- errors. Since the code for handling these errors can cause another
89 -- exception to be raised (namely Unrecoverable_Error), we need two
90 -- nested blocks, so that the outer one handles unrecoverable error.
93 -- Lib.Initialize need to be called before Scan_Compiler_Arguments,
94 -- because it initialize a table that is filled by
95 -- Scan_Compiler_Arguments.
101 Scan_Compiler_Arguments
;
102 Osint
.Add_Default_Search_Dirs
;
120 Sem_Type
.Init_Interp_Tables
;
122 -- Acquire target parameters from system.ads (source of package System)
127 S
: Source_File_Index
;
131 Name_Buffer
(1 .. 10) := "system.ads";
134 S
:= Load_Source_File
(N
);
136 if S
= No_Source_File
then
138 ("fatal error, run-time library not installed correctly");
140 ("cannot locate file system.ads");
141 raise Unrecoverable_Error
;
143 -- Remember source index of system.ads (which was read successfully)
146 System_Source_File_Index
:= S
;
149 Targparm
.Get_Target_Parameters
150 (System_Text
=> Source_Text
(S
),
151 Source_First
=> Source_First
(S
),
152 Source_Last
=> Source_Last
(S
));
154 -- Acquire configuration pragma information from Targparm
156 Restrict
.Restrictions
:= Targparm
.Restrictions_On_Target
;
159 -- Set Configurable_Run_Time mode if system.ads flag set
161 if Targparm
.Configurable_Run_Time_On_Target
or Debug_Flag_YY
then
162 Configurable_Run_Time_Mode
:= True;
165 -- Set -gnatR3m mode if debug flag A set
167 if Debug_Flag_AA
then
168 Back_Annotate_Rep_Info
:= True;
169 List_Representation_Info
:= 1;
170 List_Representation_Info_Mechanisms
:= True;
173 -- Output copyright notice if full list mode
175 if (Verbose_Mode
or Full_List
)
176 and then (not Debug_Flag_7
)
180 Write_Str
(Gnat_Version_String
);
182 Write_Str
("Copyright 1992-" &
184 ", Free Software Foundation, Inc.");
188 -- Before we do anything else, adjust certain global values for
189 -- debug switches which modify their normal natural settings.
192 Ttypes
.Bytes_Big_Endian
:= not Ttypes
.Bytes_Big_Endian
;
196 Targparm
.OpenVMS_On_Target
:= True;
197 Hostparm
.OpenVMS
:= True;
200 if Debug_Flag_FF
then
201 Targparm
.Frontend_Layout_On_Target
:= True;
204 -- We take the default exception mechanism into account
206 if Targparm
.ZCX_By_Default_On_Target
then
207 if Targparm
.GCC_ZCX_Support_On_Target
then
208 Exception_Mechanism
:= Back_End_Exceptions
;
211 ("Zero Cost Exceptions not supported on this target");
215 -- Set proper status for overflow checks. We turn on overflow checks
216 -- if -gnatp was not specified, and either -gnato is set or the back
217 -- end takes care of overflow checks. Otherwise we suppress overflow
218 -- checks by default (since front end checks are expensive).
220 if not Opt
.Suppress_Checks
221 and then (Opt
.Enable_Overflow_Checks
223 (Targparm
.Backend_Divide_Checks_On_Target
225 Targparm
.Backend_Overflow_Checks_On_Target
))
227 Suppress_Options
(Overflow_Check
) := False;
229 Suppress_Options
(Overflow_Check
) := True;
232 -- Check we have exactly one source file, this happens only in the case
233 -- where the driver is called directly, it cannot happen when gnat1 is
234 -- invoked from gcc in the normal case.
236 if Osint
.Number_Of_Files
/= 1 then
239 Osint
.Fail
("you must provide one source file");
241 elsif Usage_Requested
then
245 Original_Operating_Mode
:= Operating_Mode
;
247 Main_Unit_Node
:= Cunit
(Main_Unit
);
248 Main_Kind
:= Nkind
(Unit
(Main_Unit_Node
));
250 -- Check for suspicious or incorrect body present if we are doing
251 -- semantic checking. We omit this check in syntax only mode, because
252 -- in that case we do not know if we need a body or not.
254 if Operating_Mode
/= Check_Syntax
256 ((Main_Kind
= N_Package_Declaration
257 and then not Body_Required
(Main_Unit_Node
))
258 or else (Main_Kind
= N_Generic_Package_Declaration
259 and then not Body_Required
(Main_Unit_Node
))
260 or else Main_Kind
= N_Package_Renaming_Declaration
261 or else Main_Kind
= N_Subprogram_Renaming_Declaration
262 or else Nkind
(Original_Node
(Unit
(Main_Unit_Node
)))
263 in N_Generic_Instantiation
)
266 Sname
: Unit_Name_Type
:= Unit_Name
(Main_Unit
);
267 Src_Ind
: Source_File_Index
;
268 Fname
: File_Name_Type
;
270 procedure Bad_Body_Error
(Msg
: String);
271 -- Issue message for bad body found
277 procedure Bad_Body_Error
(Msg
: String) is
279 Error_Msg_N
(Msg
, Main_Unit_Node
);
280 Error_Msg_Name_1
:= Fname
;
282 ("remove incorrect body in file{!", Main_Unit_Node
);
285 -- Start of processing for Bad_Body
288 Sname
:= Unit_Name
(Main_Unit
);
290 -- If we do not already have a body name, then get the body name
291 -- (but how can we have a body name here ???)
293 if not Is_Body_Name
(Sname
) then
294 Sname
:= Get_Body_Name
(Sname
);
297 Fname
:= Get_File_Name
(Sname
, Subunit
=> False);
298 Src_Ind
:= Load_Source_File
(Fname
);
300 -- Case where body is present and it is not a subunit. Exclude
301 -- the subunit case, because it has nothing to do with the
302 -- package we are compiling. It is illegal for a child unit and a
303 -- subunit with the same expanded name (RM 10.2(9)) to appear
304 -- together in a partition, but there is nothing to stop a
305 -- compilation environment from having both, and the test here
306 -- simply allows that. If there is an attempt to include both in
307 -- a partition, this is diagnosed at bind time. In Ada 83 mode
308 -- this is not a warning case.
310 -- Note: if weird file names are being used, we can have
311 -- situation where the file name that supposedly contains body,
312 -- in fact contains a spec, or we can't tell what it contains.
313 -- Skip the error message in these cases.
315 if Src_Ind
/= No_Source_File
316 and then Get_Expected_Unit_Type
(Fname
) = Expect_Body
317 and then not Source_File_Is_Subunit
(Src_Ind
)
319 Error_Msg_Name_1
:= Sname
;
321 -- Ada 83 case of a package body being ignored. This is not an
322 -- error as far as the Ada 83 RM is concerned, but it is
323 -- almost certainly not what is wanted so output a warning.
324 -- Give this message only if there were no errors, since
325 -- otherwise it may be incorrect (we may have misinterpreted a
326 -- junk spec as not needing a body when it really does).
328 if Main_Kind
= N_Package_Declaration
329 and then Ada_Version
= Ada_83
330 and then Operating_Mode
= Generate_Code
331 and then Distribution_Stub_Mode
/= Generate_Caller_Stub_Body
332 and then not Compilation_Errors
335 ("package % does not require a body?", Main_Unit_Node
);
336 Error_Msg_Name_1
:= Fname
;
338 ("body in file{? will be ignored", Main_Unit_Node
);
340 -- Ada 95 cases of a body file present when no body is
341 -- permitted. This we consider to be an error.
344 -- For generic instantiations, we never allow a body
346 if Nkind
(Original_Node
(Unit
(Main_Unit_Node
)))
347 in N_Generic_Instantiation
350 ("generic instantiation for % does not allow a body");
352 -- A library unit that is a renaming never allows a body
354 elsif Main_Kind
in N_Renaming_Declaration
then
356 ("renaming declaration for % does not allow a body!");
358 -- Remaining cases are packages and generic packages. Here
359 -- we only do the test if there are no previous errors,
360 -- because if there are errors, they may lead us to
361 -- incorrectly believe that a package does not allow a body
362 -- when in fact it does.
364 elsif not Compilation_Errors
then
365 if Main_Kind
= N_Package_Declaration
then
367 ("package % does not allow a body!");
369 elsif Main_Kind
= N_Generic_Package_Declaration
then
371 ("generic package % does not allow a body!");
380 -- Exit if compilation errors detected
382 if Compilation_Errors
then
384 Sem_Ch13
.Validate_Unchecked_Conversions
;
388 -- Generate ALI file if specially requested
390 if Opt
.Force_ALI_Tree_File
then
391 Write_ALI
(Object
=> False);
395 Exit_Program
(E_Errors
);
398 -- Set Generate_Code on main unit and its spec. We do this even if are
399 -- not generating code, since Lib-Writ uses this to determine which
400 -- units get written in the ali file.
402 Set_Generate_Code
(Main_Unit
);
404 -- If we have a corresponding spec, then we need object
405 -- code for the spec unit as well
407 if Nkind
(Unit
(Main_Unit_Node
)) in N_Unit_Body
408 and then not Acts_As_Spec
(Main_Unit_Node
)
411 (Get_Cunit_Unit_Number
(Library_Unit
(Main_Unit_Node
)));
414 -- Case of no code required to be generated, exit indicating no error
416 if Original_Operating_Mode
= Check_Syntax
then
422 -- Use a goto instead of calling Exit_Program so that finalization
427 elsif Original_Operating_Mode
= Check_Semantics
then
428 Back_End_Mode
:= Declarations_Only
;
430 -- All remaining cases are cases in which the user requested that code
431 -- be generated (i.e. no -gnatc or -gnats switch was used). Check if
432 -- we can in fact satisfy this request.
434 -- Cannot generate code if someone has turned off code generation for
435 -- any reason at all. We will try to figure out a reason below.
437 elsif Operating_Mode
/= Generate_Code
then
438 Back_End_Mode
:= Skip
;
440 -- We can generate code for a subprogram body unless there were missing
441 -- subunits. Note that we always generate code for all generic units (a
442 -- change from some previous versions of GNAT).
444 elsif Main_Kind
= N_Subprogram_Body
445 and then not Subunits_Missing
447 Back_End_Mode
:= Generate_Object
;
449 -- We can generate code for a package body unless there are subunits
450 -- missing (note that we always generate code for generic units, which
451 -- is a change from some earlier versions of GNAT).
453 elsif Main_Kind
= N_Package_Body
454 and then not Subunits_Missing
456 Back_End_Mode
:= Generate_Object
;
458 -- We can generate code for a package declaration or a subprogram
459 -- declaration only if it does not required a body.
461 elsif (Main_Kind
= N_Package_Declaration
463 Main_Kind
= N_Subprogram_Declaration
)
465 (not Body_Required
(Main_Unit_Node
)
467 Distribution_Stub_Mode
= Generate_Caller_Stub_Body
)
469 Back_End_Mode
:= Generate_Object
;
471 -- We can generate code for a generic package declaration of a generic
472 -- subprogram declaration only if does not require a body.
474 elsif (Main_Kind
= N_Generic_Package_Declaration
476 Main_Kind
= N_Generic_Subprogram_Declaration
)
477 and then not Body_Required
(Main_Unit_Node
)
479 Back_End_Mode
:= Generate_Object
;
481 -- Compilation units that are renamings do not require bodies,
482 -- so we can generate code for them.
484 elsif Main_Kind
= N_Package_Renaming_Declaration
485 or else Main_Kind
= N_Subprogram_Renaming_Declaration
487 Back_End_Mode
:= Generate_Object
;
489 -- Compilation units that are generic renamings do not require bodies
490 -- so we can generate code for them.
492 elsif Main_Kind
in N_Generic_Renaming_Declaration
then
493 Back_End_Mode
:= Generate_Object
;
495 -- In all other cases (specs which have bodies, generics, and bodies
496 -- where subunits are missing), we cannot generate code and we generate
497 -- a warning message. Note that generic instantiations are gone at this
498 -- stage since they have been replaced by their instances.
501 Back_End_Mode
:= Skip
;
504 -- At this stage Call_Back_End is set to indicate if the backend should
505 -- be called to generate code. If it is not set, then code generation
506 -- has been turned off, even though code was requested by the original
507 -- command. This is not an error from the user point of view, but it is
508 -- an error from the point of view of the gcc driver, so we must exit
509 -- with an error status.
511 -- We generate an informative message (from the gcc point of view, it
512 -- is an error message, but from the users point of view this is not an
513 -- error, just a consequence of compiling something that cannot
516 if Back_End_Mode
= Skip
then
517 Write_Str
("cannot generate code for ");
519 Write_Name
(Unit_File_Name
(Main_Unit
));
521 if Subunits_Missing
then
522 Write_Str
(" (missing subunits)");
524 Write_Str
("to check parent unit");
526 elsif Main_Kind
= N_Subunit
then
527 Write_Str
(" (subunit)");
529 Write_Str
("to check subunit");
531 elsif Main_Kind
= N_Subprogram_Declaration
then
532 Write_Str
(" (subprogram spec)");
534 Write_Str
("to check subprogram spec");
536 -- Generic package body in GNAT implementation mode
538 elsif Main_Kind
= N_Package_Body
and then GNAT_Mode
then
539 Write_Str
(" (predefined generic)");
541 Write_Str
("to check predefined generic");
543 -- Only other case is a package spec
546 Write_Str
(" (package spec)");
548 Write_Str
("to check package spec");
551 Write_Str
(" for errors, use ");
553 if Hostparm
.OpenVMS
then
554 Write_Str
("/NOLOAD");
556 Write_Str
("-gnatc");
561 Sem_Ch13
.Validate_Unchecked_Conversions
;
565 Write_ALI
(Object
=> False);
568 -- Exit program with error indication, to kill object file
570 Exit_Program
(E_No_Code
);
573 -- In -gnatc mode, we only do annotation if -gnatt or -gnatR is also
574 -- set as indicated by Back_Annotate_Rep_Info being set to True.
576 -- We don't call for annotations on a subunit, because to process those
577 -- the back-end requires that the parent(s) be properly compiled.
579 -- Annotation is suppressed for targets where front-end layout is
580 -- enabled, because the front end determines representations.
582 -- Annotation is also suppressed in the case of compiling for
583 -- the Java VM, since representations are largely symbolic there.
585 if Back_End_Mode
= Declarations_Only
586 and then (not Back_Annotate_Rep_Info
587 or else Main_Kind
= N_Subunit
588 or else Targparm
.Frontend_Layout_On_Target
589 or else Hostparm
.Java_VM
)
591 Sem_Ch13
.Validate_Unchecked_Conversions
;
593 Write_ALI
(Object
=> False);
600 -- Ensure that we properly register a dependency on system.ads, since
601 -- even if we do not semantically depend on this, Targparm has read
602 -- system parameters from the system.ads file.
604 Lib
.Writ
.Ensure_System_Dependency
;
606 -- Add dependencies, if any, on preprocessing data file and on
607 -- preprocessing definition file(s).
609 Prepcomp
.Add_Dependencies
;
611 -- Back end needs to explicitly unlock tables it needs to touch
624 -- Here we call the back end to generate the output code
626 Back_End
.Call_Back_End
(Back_End_Mode
);
628 -- Once the backend is complete, we unlock the names table. This call
629 -- allows a few extra entries, needed for example for the file name for
630 -- the library file output.
634 -- Validate unchecked conversions (using the values for size and
635 -- alignment annotated by the backend where possible).
637 Sem_Ch13
.Validate_Unchecked_Conversions
;
639 -- Now we complete output of errors, rep info and the tree info. These
640 -- are delayed till now, since it is perfectly possible for gigi to
641 -- generate errors, modify the tree (in particular by setting flags
642 -- indicating that elaboration is required, and also to back annotate
643 -- representation information for List_Rep_Info.
648 -- Only write the library if the backend did not generate any error
649 -- messages. Otherwise signal errors to the driver program so that
650 -- there will be no attempt to generate an object file.
652 if Compilation_Errors
then
654 Exit_Program
(E_Errors
);
657 Write_ALI
(Object
=> (Back_End_Mode
= Generate_Object
));
659 -- Generate the ASIS tree after writing the ALI file, since in ASIS
660 -- mode, Write_ALI may in fact result in further tree decoration from
661 -- the original tree file. Note that we dump the tree just before
662 -- generating it, so that the dump will exactly reflect what is written
668 -- Finalize name table and we are all done
673 -- Handle fatal internal compiler errors
675 when System
.Assertions
.Assert_Failure
=>
676 Comperr
.Compiler_Abort
("Assert_Failure");
678 when Constraint_Error
=>
679 Comperr
.Compiler_Abort
("Constraint_Error");
681 when Program_Error
=>
682 Comperr
.Compiler_Abort
("Program_Error");
684 when Storage_Error
=>
686 -- Assume this is a bug. If it is real, the message will in any case
687 -- say Storage_Error, giving a strong hint!
689 Comperr
.Compiler_Abort
("Storage_Error");
695 -- The outer exception handles an unrecoverable error
698 when Unrecoverable_Error
=>
702 Write_Str
("compilation abandoned");
708 Exit_Program
(E_Errors
);