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);
173 Write_Str (" Copyright 1992-2004 Free Software Foundation, Inc.");
177 -- Before we do anything else, adjust certain global values for
178 -- debug switches which modify their normal natural settings.
181 Ttypes.Bytes_Big_Endian := not Ttypes.Bytes_Big_Endian;
185 Targparm.OpenVMS_On_Target := True;
186 Hostparm.OpenVMS := True;
189 if Debug_Flag_FF then
190 Targparm.Frontend_Layout_On_Target := True;
193 -- We take the default exception mechanism into account
195 if Targparm.ZCX_By_Default_On_Target then
196 if Targparm.GCC_ZCX_Support_On_Target then
197 Exception_Mechanism := Back_End_ZCX_Exceptions;
199 Exception_Mechanism := Front_End_ZCX_Exceptions;
203 -- We take the command line exception mechanism into account
205 if Opt.Zero_Cost_Exceptions_Set then
206 if Opt.Zero_Cost_Exceptions_Val = False then
207 Exception_Mechanism := Front_End_Setjmp_Longjmp_Exceptions;
209 elsif Debug_Flag_XX then
210 Exception_Mechanism := Front_End_ZCX_Exceptions;
212 elsif Targparm.GCC_ZCX_Support_On_Target then
213 Exception_Mechanism := Back_End_ZCX_Exceptions;
215 elsif Targparm.Front_End_ZCX_Support_On_Target then
216 Exception_Mechanism := Front_End_ZCX_Exceptions;
220 ("Zero Cost Exceptions not supported on this target");
224 -- Set proper status for overflow checks. We turn on overflow checks
225 -- if -gnatp was not specified, and either -gnato is set or the back
226 -- end takes care of overflow checks. Otherwise we suppress overflow
227 -- checks by default (since front end checks are expensive).
229 if not Opt.Suppress_Checks
230 and then (Opt.Enable_Overflow_Checks
232 (Targparm.Backend_Divide_Checks_On_Target
234 Targparm.Backend_Overflow_Checks_On_Target))
236 Suppress_Options (Overflow_Check) := False;
238 Suppress_Options (Overflow_Check) := True;
241 -- Check we have exactly one source file, this happens only in
242 -- the case where the driver is called directly, it cannot happen
243 -- when gnat1 is invoked from gcc in the normal case.
245 if Osint.Number_Of_Files /= 1 then
248 Osint.Fail ("you must provide one source file");
250 elsif Usage_Requested then
254 Original_Operating_Mode := Operating_Mode;
256 Main_Unit_Node := Cunit (Main_Unit);
257 Main_Kind := Nkind (Unit (Main_Unit_Node));
259 -- Check for suspicious or incorrect body present if we are doing
260 -- semantic checking. We omit this check in syntax only mode, because
261 -- in that case we do not know if we need a body or not.
263 if Operating_Mode /= Check_Syntax
265 ((Main_Kind = N_Package_Declaration
266 and then not Body_Required (Main_Unit_Node))
267 or else (Main_Kind = N_Generic_Package_Declaration
268 and then not Body_Required (Main_Unit_Node))
269 or else Main_Kind = N_Package_Renaming_Declaration
270 or else Main_Kind = N_Subprogram_Renaming_Declaration
271 or else Nkind (Original_Node (Unit (Main_Unit_Node)))
272 in N_Generic_Instantiation)
275 Sname : Unit_Name_Type := Unit_Name (Main_Unit);
276 Src_Ind : Source_File_Index;
277 Fname : File_Name_Type;
279 procedure Bad_Body (Msg : String);
280 -- Issue message for bad body found
282 procedure Bad_Body (Msg : String) is
284 Error_Msg_N (Msg, Main_Unit_Node);
285 Error_Msg_Name_1 := Fname;
287 ("remove incorrect body in file{!", Main_Unit_Node);
291 Sname := Unit_Name (Main_Unit);
293 -- If we do not already have a body name, then get the body
294 -- name (but how can we have a body name here ???)
296 if not Is_Body_Name (Sname) then
297 Sname := Get_Body_Name (Sname);
300 Fname := Get_File_Name (Sname, Subunit => False);
301 Src_Ind := Load_Source_File (Fname);
303 -- Case where body is present and it is not a subunit. Exclude
304 -- the subunit case, because it has nothing to do with the
305 -- package we are compiling. It is illegal for a child unit
306 -- and a subunit with the same expanded name (RM 10.2(9)) to
307 -- appear together in a partition, but there is nothing to
308 -- stop a compilation environment from having both, and the
309 -- test here simply allows that. If there is an attempt to
310 -- include both in a partition, this is diagnosed at bind time.
311 -- In Ada 83 mode this is not a warning case.
313 -- Note: if weird file names are being used, we can have a
314 -- situation where the file name that supposedly contains a
315 -- body, in fact contains a spec, or we can't tell what it
316 -- contains. Skip the error message in these cases.
318 if Src_Ind /= No_Source_File
319 and then Get_Expected_Unit_Type (Fname) = Expect_Body
320 and then not Source_File_Is_Subunit (Src_Ind)
322 Error_Msg_Name_1 := Sname;
324 -- Ada 83 case of a package body being ignored. This is not
325 -- an error as far as the Ada 83 RM is concerned, but it is
326 -- almost certainly not what is wanted so output a warning.
327 -- Give this message only if there were no errors, since
328 -- otherwise it may be incorrect (we may have misinterpreted
329 -- a junk spec as not needing a body when it really does).
331 if Main_Kind = N_Package_Declaration
332 and then Ada_Version = Ada_83
333 and then Operating_Mode = Generate_Code
334 and then Distribution_Stub_Mode /= Generate_Caller_Stub_Body
335 and then not Compilation_Errors
338 ("package % does not require a body?!", Main_Unit_Node);
339 Error_Msg_Name_1 := Fname;
341 ("body in file{?! will be ignored", Main_Unit_Node);
343 -- Ada 95 cases of a body file present when no body is
344 -- permitted. This we consider to be an error.
347 -- For generic instantiations, we never allow a body
349 if Nkind (Original_Node (Unit (Main_Unit_Node)))
350 in N_Generic_Instantiation
353 ("generic instantiation for % does not allow a body");
355 -- A library unit that is a renaming never allows a body
357 elsif Main_Kind in N_Renaming_Declaration then
359 ("renaming declaration for % does not allow a body!");
361 -- Remaining cases are packages and generic packages.
362 -- Here we only do the test if there are no previous
363 -- errors, because if there are errors, they may lead
364 -- us to incorrectly believe that a package does not
365 -- allow a body when in fact it does.
367 elsif not Compilation_Errors then
368 if Main_Kind = N_Package_Declaration then
369 Bad_Body ("package % does not allow a body!");
371 elsif Main_Kind = N_Generic_Package_Declaration then
372 Bad_Body ("generic package % does not allow a body!");
381 -- Exit if compilation errors detected
383 if Compilation_Errors then
385 Sem_Ch13.Validate_Unchecked_Conversions;
389 -- Generate ALI file if specially requested
391 if Opt.Force_ALI_Tree_File then
392 Write_ALI (Object => False);
396 Exit_Program (E_Errors);
399 -- Set Generate_Code on main unit and its spec. We do this even if
400 -- are not generating code, since Lib-Writ uses this to determine
401 -- which units get written in the ali file.
403 Set_Generate_Code (Main_Unit);
405 -- If we have a corresponding spec, then we need object
406 -- code for the spec unit as well
408 if Nkind (Unit (Main_Unit_Node)) in N_Unit_Body
409 and then not Acts_As_Spec (Main_Unit_Node)
412 (Get_Cunit_Unit_Number (Library_Unit (Main_Unit_Node)));
415 -- Case of no code required to be generated, exit indicating no error
417 if Original_Operating_Mode = Check_Syntax then
422 Exit_Program (E_Success);
424 elsif Original_Operating_Mode = Check_Semantics then
425 Back_End_Mode := Declarations_Only;
427 -- All remaining cases are cases in which the user requested that code
428 -- be generated (i.e. no -gnatc or -gnats switch was used). Check if
429 -- we can in fact satisfy this request.
431 -- Cannot generate code if someone has turned off code generation
432 -- for any reason at all. We will try to figure out a reason below.
434 elsif Operating_Mode /= Generate_Code then
435 Back_End_Mode := Skip;
437 -- We can generate code for a subprogram body unless there were
438 -- missing subunits. Note that we always generate code for all
439 -- generic units (a change from some previous versions of GNAT).
441 elsif Main_Kind = N_Subprogram_Body
442 and then not Subunits_Missing
444 Back_End_Mode := Generate_Object;
446 -- We can generate code for a package body unless there are subunits
447 -- missing (note that we always generate code for generic units, which
448 -- is a change from some earlier versions of GNAT).
450 elsif Main_Kind = N_Package_Body
451 and then not Subunits_Missing
453 Back_End_Mode := Generate_Object;
455 -- We can generate code for a package declaration or a subprogram
456 -- declaration only if it does not required a body.
458 elsif (Main_Kind = N_Package_Declaration
460 Main_Kind = N_Subprogram_Declaration)
462 (not Body_Required (Main_Unit_Node)
464 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
466 Back_End_Mode := Generate_Object;
468 -- We can generate code for a generic package declaration of a generic
469 -- subprogram declaration only if does not require a body.
471 elsif (Main_Kind = N_Generic_Package_Declaration
473 Main_Kind = N_Generic_Subprogram_Declaration)
474 and then not Body_Required (Main_Unit_Node)
476 Back_End_Mode := Generate_Object;
478 -- Compilation units that are renamings do not require bodies,
479 -- so we can generate code for them.
481 elsif Main_Kind = N_Package_Renaming_Declaration
482 or else Main_Kind = N_Subprogram_Renaming_Declaration
484 Back_End_Mode := Generate_Object;
486 -- Compilation units that are generic renamings do not require bodies
487 -- so we can generate code for them.
489 elsif Main_Kind in N_Generic_Renaming_Declaration then
490 Back_End_Mode := Generate_Object;
492 -- In all other cases (specs which have bodies, generics, and bodies
493 -- where subunits are missing), we cannot generate code and we generate
494 -- a warning message. Note that generic instantiations are gone at this
495 -- stage since they have been replaced by their instances.
498 Back_End_Mode := Skip;
501 -- At this stage Call_Back_End is set to indicate if the backend
502 -- should be called to generate code. If it is not set, then code
503 -- generation has been turned off, even though code was requested
504 -- by the original command. This is not an error from the user
505 -- point of view, but it is an error from the point of view of
506 -- the gcc driver, so we must exit with an error status.
508 -- We generate an informative message (from the gcc point of view,
509 -- it is an error message, but from the users point of view this
510 -- is not an error, just a consequence of compiling something that
511 -- cannot generate code).
513 if Back_End_Mode = Skip then
514 Write_Str ("cannot generate code for ");
516 Write_Name (Unit_File_Name (Main_Unit));
518 if Subunits_Missing then
519 Write_Str (" (missing subunits)");
521 Write_Str ("to check parent unit");
523 elsif Main_Kind = N_Subunit then
524 Write_Str (" (subunit)");
526 Write_Str ("to check subunit");
528 elsif Main_Kind = N_Subprogram_Declaration then
529 Write_Str (" (subprogram spec)");
531 Write_Str ("to check subprogram spec");
533 -- Generic package body in GNAT implementation mode
535 elsif Main_Kind = N_Package_Body and then GNAT_Mode then
536 Write_Str (" (predefined generic)");
538 Write_Str ("to check predefined generic");
540 -- Only other case is a package spec
543 Write_Str (" (package spec)");
545 Write_Str ("to check package spec");
548 Write_Str (" for errors, use ");
550 if Hostparm.OpenVMS then
551 Write_Str ("/NOLOAD");
553 Write_Str ("-gnatc");
558 Sem_Ch13.Validate_Unchecked_Conversions;
562 Write_ALI (Object => False);
565 -- Exit program with error indication, to kill object file
567 Exit_Program (E_No_Code);
570 -- In -gnatc mode, we only do annotation if -gnatt or -gnatR is also
571 -- set as indicated by Back_Annotate_Rep_Info being set to True.
573 -- We don't call for annotations on a subunit, because to process those
574 -- the back-end requires that the parent(s) be properly compiled.
576 -- Annotation is suppressed for targets where front-end layout is
577 -- enabled, because the front end determines representations.
579 -- Annotation is also suppressed in the case of compiling for
580 -- the Java VM, since representations are largely symbolic there.
582 if Back_End_Mode = Declarations_Only
583 and then (not (Back_Annotate_Rep_Info or Debug_Flag_AA)
584 or else Main_Kind = N_Subunit
585 or else Targparm.Frontend_Layout_On_Target
586 or else Hostparm.Java_VM)
588 Sem_Ch13.Validate_Unchecked_Conversions;
590 Write_ALI (Object => False);
597 -- Ensure that we properly register a dependency on system.ads,
598 -- since even if we do not semantically depend on this, Targparm
599 -- has read system parameters from the system.ads file.
601 Lib.Writ.Ensure_System_Dependency;
603 -- Add dependencies, if any, on preprocessing data file and on
604 -- preprocessing definition file(s).
606 Prepcomp.Add_Dependencies;
608 -- Back end needs to explicitly unlock tables it needs to touch
621 -- Here we call the back end to generate the output code
623 Back_End.Call_Back_End (Back_End_Mode);
625 -- Once the backend is complete, we unlock the names table. This
626 -- call allows a few extra entries, needed for example for the file
627 -- name for the library file output.
631 -- Validate unchecked conversions (using the values for size
632 -- and alignment annotated by the backend where possible).
634 Sem_Ch13.Validate_Unchecked_Conversions;
636 -- Now we complete output of errors, rep info and the tree info.
637 -- These are delayed till now, since it is perfectly possible for
638 -- gigi to generate errors, modify the tree (in particular by setting
639 -- flags indicating that elaboration is required, and also to back
640 -- annotate representation information for List_Rep_Info.
645 -- Only write the library if the backend did not generate any error
646 -- messages. Otherwise signal errors to the driver program so that
647 -- there will be no attempt to generate an object file.
649 if Compilation_Errors then
651 Exit_Program (E_Errors);
654 Write_ALI (Object => (Back_End_Mode = Generate_Object));
656 -- Generate the ASIS tree after writing the ALI file, since in
657 -- ASIS mode, Write_ALI may in fact result in further tree
658 -- decoration from the original tree file. Note that we dump
659 -- the tree just before generating it, so that the dump will
660 -- exactly reflect what is written out.
665 -- Finalize name table and we are all done
670 -- Handle fatal internal compiler errors
672 when System.Assertions.Assert_Failure =>
673 Comperr.Compiler_Abort ("Assert_Failure");
675 when Constraint_Error =>
676 Comperr.Compiler_Abort ("Constraint_Error");
678 when Program_Error =>
679 Comperr.Compiler_Abort ("Program_Error");
681 when Storage_Error =>
683 -- Assume this is a bug. If it is real, the message will in
684 -- any case say Storage_Error, giving a strong hint!
686 Comperr.Compiler_Abort ("Storage_Error");
689 -- The outer exception handles an unrecoverable error
692 when Unrecoverable_Error =>
696 Write_Str ("compilation abandoned");
702 Exit_Program (E_Errors);