1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2004 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, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, 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 -- Here if system.ads successfully read. Remember its source index.
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 -- Output copyright notice if full list mode
167 if (Verbose_Mode or Full_List)
168 and then (not Debug_Flag_7)
172 Write_Str (Gnat_Version_String);
174 Write_Str ("Copyright 1992-2004 Free Software Foundation, Inc.");
178 -- Before we do anything else, adjust certain global values for
179 -- debug switches which modify their normal natural settings.
182 Ttypes.Bytes_Big_Endian := not Ttypes.Bytes_Big_Endian;
186 Targparm.OpenVMS_On_Target := True;
187 Hostparm.OpenVMS := True;
190 if Debug_Flag_FF then
191 Targparm.Frontend_Layout_On_Target := True;
194 -- We take the default exception mechanism into account
196 if Targparm.ZCX_By_Default_On_Target then
197 if Targparm.GCC_ZCX_Support_On_Target then
198 Exception_Mechanism := Back_End_ZCX_Exceptions;
200 Exception_Mechanism := Front_End_ZCX_Exceptions;
204 -- We take the command line exception mechanism into account
206 if Opt.Zero_Cost_Exceptions_Set then
207 if Opt.Zero_Cost_Exceptions_Val = False then
208 Exception_Mechanism := Front_End_Setjmp_Longjmp_Exceptions;
210 elsif Debug_Flag_XX then
211 Exception_Mechanism := Front_End_ZCX_Exceptions;
213 elsif Targparm.GCC_ZCX_Support_On_Target then
214 Exception_Mechanism := Back_End_ZCX_Exceptions;
216 elsif Targparm.Front_End_ZCX_Support_On_Target then
217 Exception_Mechanism := Front_End_ZCX_Exceptions;
221 ("Zero Cost Exceptions not supported on this target");
225 -- Set proper status for overflow checks. We turn on overflow checks
226 -- if -gnatp was not specified, and either -gnato is set or the back
227 -- end takes care of overflow checks. Otherwise we suppress overflow
228 -- checks by default (since front end checks are expensive).
230 if not Opt.Suppress_Checks
231 and then (Opt.Enable_Overflow_Checks
233 (Targparm.Backend_Divide_Checks_On_Target
235 Targparm.Backend_Overflow_Checks_On_Target))
237 Suppress_Options (Overflow_Check) := False;
239 Suppress_Options (Overflow_Check) := True;
242 -- Check we have exactly one source file, this happens only in
243 -- the case where the driver is called directly, it cannot happen
244 -- when gnat1 is invoked from gcc in the normal case.
246 if Osint.Number_Of_Files /= 1 then
249 Osint.Fail ("you must provide one source file");
251 elsif Usage_Requested then
255 Original_Operating_Mode := Operating_Mode;
257 Main_Unit_Node := Cunit (Main_Unit);
258 Main_Kind := Nkind (Unit (Main_Unit_Node));
260 -- Check for suspicious or incorrect body present if we are doing
261 -- semantic checking. We omit this check in syntax only mode, because
262 -- in that case we do not know if we need a body or not.
264 if Operating_Mode /= Check_Syntax
266 ((Main_Kind = N_Package_Declaration
267 and then not Body_Required (Main_Unit_Node))
268 or else (Main_Kind = N_Generic_Package_Declaration
269 and then not Body_Required (Main_Unit_Node))
270 or else Main_Kind = N_Package_Renaming_Declaration
271 or else Main_Kind = N_Subprogram_Renaming_Declaration
272 or else Nkind (Original_Node (Unit (Main_Unit_Node)))
273 in N_Generic_Instantiation)
276 Sname : Unit_Name_Type := Unit_Name (Main_Unit);
277 Src_Ind : Source_File_Index;
278 Fname : File_Name_Type;
280 procedure Bad_Body (Msg : String);
281 -- Issue message for bad body found
283 procedure Bad_Body (Msg : String) is
285 Error_Msg_N (Msg, Main_Unit_Node);
286 Error_Msg_Name_1 := Fname;
288 ("remove incorrect body in file{!", Main_Unit_Node);
292 Sname := Unit_Name (Main_Unit);
294 -- If we do not already have a body name, then get the body
295 -- name (but how can we have a body name here ???)
297 if not Is_Body_Name (Sname) then
298 Sname := Get_Body_Name (Sname);
301 Fname := Get_File_Name (Sname, Subunit => False);
302 Src_Ind := Load_Source_File (Fname);
304 -- Case where body is present and it is not a subunit. Exclude
305 -- the subunit case, because it has nothing to do with the
306 -- package we are compiling. It is illegal for a child unit
307 -- and a subunit with the same expanded name (RM 10.2(9)) to
308 -- appear together in a partition, but there is nothing to
309 -- stop a compilation environment from having both, and the
310 -- test here simply allows that. If there is an attempt to
311 -- include both in a partition, this is diagnosed at bind time.
312 -- In Ada 83 mode this is not a warning case.
314 -- Note: if weird file names are being used, we can have a
315 -- situation where the file name that supposedly contains a
316 -- body, in fact contains a spec, or we can't tell what it
317 -- contains. Skip the error message in these cases.
319 if Src_Ind /= No_Source_File
320 and then Get_Expected_Unit_Type (Fname) = Expect_Body
321 and then not Source_File_Is_Subunit (Src_Ind)
323 Error_Msg_Name_1 := Sname;
325 -- Ada 83 case of a package body being ignored. This is not
326 -- an error as far as the Ada 83 RM is concerned, but it is
327 -- almost certainly not what is wanted so output a warning.
328 -- Give this message only if there were no errors, since
329 -- otherwise it may be incorrect (we may have misinterpreted
330 -- a junk spec as not needing a body when it really does).
332 if Main_Kind = N_Package_Declaration
333 and then Ada_Version = Ada_83
334 and then Operating_Mode = Generate_Code
335 and then Distribution_Stub_Mode /= Generate_Caller_Stub_Body
336 and then not Compilation_Errors
339 ("package % does not require a body?!", Main_Unit_Node);
340 Error_Msg_Name_1 := Fname;
342 ("body in file{?! will be ignored", Main_Unit_Node);
344 -- Ada 95 cases of a body file present when no body is
345 -- permitted. This we consider to be an error.
348 -- For generic instantiations, we never allow a body
350 if Nkind (Original_Node (Unit (Main_Unit_Node)))
351 in N_Generic_Instantiation
354 ("generic instantiation for % does not allow a body");
356 -- A library unit that is a renaming never allows a body
358 elsif Main_Kind in N_Renaming_Declaration then
360 ("renaming declaration for % does not allow a body!");
362 -- Remaining cases are packages and generic packages.
363 -- Here we only do the test if there are no previous
364 -- errors, because if there are errors, they may lead
365 -- us to incorrectly believe that a package does not
366 -- allow a body when in fact it does.
368 elsif not Compilation_Errors then
369 if Main_Kind = N_Package_Declaration then
370 Bad_Body ("package % does not allow a body!");
372 elsif Main_Kind = N_Generic_Package_Declaration then
373 Bad_Body ("generic package % does not allow a body!");
382 -- Exit if compilation errors detected
384 if Compilation_Errors then
386 Sem_Ch13.Validate_Unchecked_Conversions;
390 -- Generate ALI file if specially requested
392 if Opt.Force_ALI_Tree_File then
393 Write_ALI (Object => False);
397 Exit_Program (E_Errors);
400 -- Set Generate_Code on main unit and its spec. We do this even if
401 -- are not generating code, since Lib-Writ uses this to determine
402 -- which units get written in the ali file.
404 Set_Generate_Code (Main_Unit);
406 -- If we have a corresponding spec, then we need object
407 -- code for the spec unit as well
409 if Nkind (Unit (Main_Unit_Node)) in N_Unit_Body
410 and then not Acts_As_Spec (Main_Unit_Node)
413 (Get_Cunit_Unit_Number (Library_Unit (Main_Unit_Node)));
416 -- Case of no code required to be generated, exit indicating no error
418 if Original_Operating_Mode = Check_Syntax then
423 Exit_Program (E_Success);
425 elsif Original_Operating_Mode = Check_Semantics then
426 Back_End_Mode := Declarations_Only;
428 -- All remaining cases are cases in which the user requested that code
429 -- be generated (i.e. no -gnatc or -gnats switch was used). Check if
430 -- we can in fact satisfy this request.
432 -- Cannot generate code if someone has turned off code generation
433 -- for any reason at all. We will try to figure out a reason below.
435 elsif Operating_Mode /= Generate_Code then
436 Back_End_Mode := Skip;
438 -- We can generate code for a subprogram body unless there were
439 -- missing subunits. Note that we always generate code for all
440 -- generic units (a change from some previous versions of GNAT).
442 elsif Main_Kind = N_Subprogram_Body
443 and then not Subunits_Missing
445 Back_End_Mode := Generate_Object;
447 -- We can generate code for a package body unless there are subunits
448 -- missing (note that we always generate code for generic units, which
449 -- is a change from some earlier versions of GNAT).
451 elsif Main_Kind = N_Package_Body
452 and then not Subunits_Missing
454 Back_End_Mode := Generate_Object;
456 -- We can generate code for a package declaration or a subprogram
457 -- declaration only if it does not required a body.
459 elsif (Main_Kind = N_Package_Declaration
461 Main_Kind = N_Subprogram_Declaration)
463 (not Body_Required (Main_Unit_Node)
465 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
467 Back_End_Mode := Generate_Object;
469 -- We can generate code for a generic package declaration of a generic
470 -- subprogram declaration only if does not require a body.
472 elsif (Main_Kind = N_Generic_Package_Declaration
474 Main_Kind = N_Generic_Subprogram_Declaration)
475 and then not Body_Required (Main_Unit_Node)
477 Back_End_Mode := Generate_Object;
479 -- Compilation units that are renamings do not require bodies,
480 -- so we can generate code for them.
482 elsif Main_Kind = N_Package_Renaming_Declaration
483 or else Main_Kind = N_Subprogram_Renaming_Declaration
485 Back_End_Mode := Generate_Object;
487 -- Compilation units that are generic renamings do not require bodies
488 -- so we can generate code for them.
490 elsif Main_Kind in N_Generic_Renaming_Declaration then
491 Back_End_Mode := Generate_Object;
493 -- In all other cases (specs which have bodies, generics, and bodies
494 -- where subunits are missing), we cannot generate code and we generate
495 -- a warning message. Note that generic instantiations are gone at this
496 -- stage since they have been replaced by their instances.
499 Back_End_Mode := Skip;
502 -- At this stage Call_Back_End is set to indicate if the backend
503 -- should be called to generate code. If it is not set, then code
504 -- generation has been turned off, even though code was requested
505 -- by the original command. This is not an error from the user
506 -- point of view, but it is an error from the point of view of
507 -- the gcc driver, so we must exit with an error status.
509 -- We generate an informative message (from the gcc point of view,
510 -- it is an error message, but from the users point of view this
511 -- is not an error, just a consequence of compiling something that
512 -- cannot generate code).
514 if Back_End_Mode = Skip then
515 Write_Str ("cannot generate code for ");
517 Write_Name (Unit_File_Name (Main_Unit));
519 if Subunits_Missing then
520 Write_Str (" (missing subunits)");
522 Write_Str ("to check parent unit");
524 elsif Main_Kind = N_Subunit then
525 Write_Str (" (subunit)");
527 Write_Str ("to check subunit");
529 elsif Main_Kind = N_Subprogram_Declaration then
530 Write_Str (" (subprogram spec)");
532 Write_Str ("to check subprogram spec");
534 -- Generic package body in GNAT implementation mode
536 elsif Main_Kind = N_Package_Body and then GNAT_Mode then
537 Write_Str (" (predefined generic)");
539 Write_Str ("to check predefined generic");
541 -- Only other case is a package spec
544 Write_Str (" (package spec)");
546 Write_Str ("to check package spec");
549 Write_Str (" for errors, use ");
551 if Hostparm.OpenVMS then
552 Write_Str ("/NOLOAD");
554 Write_Str ("-gnatc");
559 Sem_Ch13.Validate_Unchecked_Conversions;
563 Write_ALI (Object => False);
566 -- Exit program with error indication, to kill object file
568 Exit_Program (E_No_Code);
571 -- In -gnatc mode, we only do annotation if -gnatt or -gnatR is also
572 -- set as indicated by Back_Annotate_Rep_Info being set to True.
574 -- We don't call for annotations on a subunit, because to process those
575 -- the back-end requires that the parent(s) be properly compiled.
577 -- Annotation is suppressed for targets where front-end layout is
578 -- enabled, because the front end determines representations.
580 -- Annotation is also suppressed in the case of compiling for
581 -- the Java VM, since representations are largely symbolic there.
583 if Back_End_Mode = Declarations_Only
584 and then (not (Back_Annotate_Rep_Info or Debug_Flag_AA)
585 or else Main_Kind = N_Subunit
586 or else Targparm.Frontend_Layout_On_Target
587 or else Hostparm.Java_VM)
589 Sem_Ch13.Validate_Unchecked_Conversions;
591 Write_ALI (Object => False);
598 -- Ensure that we properly register a dependency on system.ads,
599 -- since even if we do not semantically depend on this, Targparm
600 -- has read system parameters from the system.ads file.
602 Lib.Writ.Ensure_System_Dependency;
604 -- Add dependencies, if any, on preprocessing data file and on
605 -- preprocessing definition file(s).
607 Prepcomp.Add_Dependencies;
609 -- Back end needs to explicitly unlock tables it needs to touch
622 -- Here we call the back end to generate the output code
624 Back_End.Call_Back_End (Back_End_Mode);
626 -- Once the backend is complete, we unlock the names table. This
627 -- call allows a few extra entries, needed for example for the file
628 -- name for the library file output.
632 -- Validate unchecked conversions (using the values for size
633 -- and alignment annotated by the backend where possible).
635 Sem_Ch13.Validate_Unchecked_Conversions;
637 -- Now we complete output of errors, rep info and the tree info.
638 -- These are delayed till now, since it is perfectly possible for
639 -- gigi to generate errors, modify the tree (in particular by setting
640 -- flags indicating that elaboration is required, and also to back
641 -- annotate representation information for List_Rep_Info.
646 -- Only write the library if the backend did not generate any error
647 -- messages. Otherwise signal errors to the driver program so that
648 -- there will be no attempt to generate an object file.
650 if Compilation_Errors then
652 Exit_Program (E_Errors);
655 Write_ALI (Object => (Back_End_Mode = Generate_Object));
657 -- Generate the ASIS tree after writing the ALI file, since in
658 -- ASIS mode, Write_ALI may in fact result in further tree
659 -- decoration from the original tree file. Note that we dump
660 -- the tree just before generating it, so that the dump will
661 -- exactly reflect what is written out.
666 -- Finalize name table and we are all done
671 -- Handle fatal internal compiler errors
673 when System.Assertions.Assert_Failure =>
674 Comperr.Compiler_Abort ("Assert_Failure");
676 when Constraint_Error =>
677 Comperr.Compiler_Abort ("Constraint_Error");
679 when Program_Error =>
680 Comperr.Compiler_Abort ("Program_Error");
682 when Storage_Error =>
684 -- Assume this is a bug. If it is real, the message will in
685 -- any case say Storage_Error, giving a strong hint!
687 Comperr.Compiler_Abort ("Storage_Error");
690 -- The outer exception handles an unrecoverable error
693 when Unrecoverable_Error =>
697 Write_Str ("compilation abandoned");
703 Exit_Program (E_Errors);