1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2007, 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;
60 with Sinfo; use Sinfo;
61 with Sinput.L; use Sinput.L;
63 with Sprint; use Sprint;
65 with Targparm; use Targparm;
67 with Treepr; use Treepr;
69 with Types; use Types;
70 with Uintp; use Uintp;
71 with Uname; use Uname;
75 with System.Assertions;
78 Main_Unit_Node : Node_Id;
79 -- Compilation unit node for main unit
81 Main_Kind : Node_Kind;
82 -- Kind of main compilation unit node
84 Back_End_Mode : Back_End.Back_End_Mode_Type;
85 -- Record back end mode
87 procedure Check_Bad_Body;
88 -- Called to check if the unit we are compiling has a bad body
90 procedure Check_Rep_Info;
91 -- Called when we are not generating code, to check if -gnatR was requested
92 -- and if so, explain that we will not be honoring the request.
98 procedure Check_Bad_Body is
99 Sname : Unit_Name_Type;
100 Src_Ind : Source_File_Index;
101 Fname : File_Name_Type;
103 procedure Bad_Body_Error (Msg : String);
104 -- Issue message for bad body found
110 procedure Bad_Body_Error (Msg : String) is
112 Error_Msg_N (Msg, Main_Unit_Node);
113 Error_Msg_File_1 := Fname;
114 Error_Msg_N ("remove incorrect body in file{!", Main_Unit_Node);
117 -- Start of processing for Check_Bad_Body
120 -- Nothing to do if we are only checking syntax, because we don't know
121 -- enough to know if we require or forbid a body in this case.
123 if Operating_Mode = Check_Syntax then
127 -- Check for body not allowed
129 if (Main_Kind = N_Package_Declaration
130 and then not Body_Required (Main_Unit_Node))
131 or else (Main_Kind = N_Generic_Package_Declaration
132 and then not Body_Required (Main_Unit_Node))
133 or else Main_Kind = N_Package_Renaming_Declaration
134 or else Main_Kind = N_Subprogram_Renaming_Declaration
135 or else Nkind (Original_Node (Unit (Main_Unit_Node)))
136 in N_Generic_Instantiation
138 Sname := Unit_Name (Main_Unit);
140 -- If we do not already have a body name, then get the body name
141 -- (but how can we have a body name here ???)
143 if not Is_Body_Name (Sname) then
144 Sname := Get_Body_Name (Sname);
147 Fname := Get_File_Name (Sname, Subunit => False);
148 Src_Ind := Load_Source_File (Fname);
150 -- Case where body is present and it is not a subunit. Exclude
151 -- the subunit case, because it has nothing to do with the
152 -- package we are compiling. It is illegal for a child unit and a
153 -- subunit with the same expanded name (RM 10.2(9)) to appear
154 -- together in a partition, but there is nothing to stop a
155 -- compilation environment from having both, and the test here
156 -- simply allows that. If there is an attempt to include both in
157 -- a partition, this is diagnosed at bind time. In Ada 83 mode
158 -- this is not a warning case.
160 -- Note: if weird file names are being used, we can have
161 -- situation where the file name that supposedly contains body,
162 -- in fact contains a spec, or we can't tell what it contains.
163 -- Skip the error message in these cases.
165 -- Also ignore body that is nothing but pragma No_Body; (that's the
166 -- whole point of this pragma, to be used this way and to cause the
167 -- body file to be ignored in this context).
169 if Src_Ind /= No_Source_File
170 and then Get_Expected_Unit_Type (Fname) = Expect_Body
171 and then not Source_File_Is_Subunit (Src_Ind)
172 and then not Source_File_Is_No_Body (Src_Ind)
176 Error_Msg_Unit_1 := Sname;
178 -- Ada 83 case of a package body being ignored. This is not an
179 -- error as far as the Ada 83 RM is concerned, but it is almost
180 -- certainly not what is wanted so output a warning. Give this
181 -- message only if there were no errors, since otherwise it may
182 -- be incorrect (we may have misinterpreted a junk spec as not
183 -- needing a body when it really does).
185 if Main_Kind = N_Package_Declaration
186 and then Ada_Version = Ada_83
187 and then Operating_Mode = Generate_Code
188 and then Distribution_Stub_Mode /= Generate_Caller_Stub_Body
189 and then not Compilation_Errors
192 ("package $$ does not require a body?", Main_Unit_Node);
193 Error_Msg_File_1 := Fname;
194 Error_Msg_N ("body in file{? will be ignored", Main_Unit_Node);
196 -- Ada 95 cases of a body file present when no body is
197 -- permitted. This we consider to be an error.
200 -- For generic instantiations, we never allow a body
202 if Nkind (Original_Node (Unit (Main_Unit_Node)))
203 in N_Generic_Instantiation
206 ("generic instantiation for $$ does not allow a body");
208 -- A library unit that is a renaming never allows a body
210 elsif Main_Kind in N_Renaming_Declaration then
212 ("renaming declaration for $$ does not allow a body!");
214 -- Remaining cases are packages and generic packages. Here
215 -- we only do the test if there are no previous errors,
216 -- because if there are errors, they may lead us to
217 -- incorrectly believe that a package does not allow a body
218 -- when in fact it does.
220 elsif not Compilation_Errors then
221 if Main_Kind = N_Package_Declaration then
223 ("package $$ does not allow a body!");
225 elsif Main_Kind = N_Generic_Package_Declaration then
227 ("generic package $$ does not allow a body!");
240 procedure Check_Rep_Info is
242 if List_Representation_Info /= 0
243 or else List_Representation_Info_Mechanisms
247 ("cannot generate representation information, no code generated");
253 -- Start of processing for Gnat1drv
256 -- This inner block is set up to catch assertion errors and constraint
257 -- errors. Since the code for handling these errors can cause another
258 -- exception to be raised (namely Unrecoverable_Error), we need two
259 -- nested blocks, so that the outer one handles unrecoverable error.
262 -- Lib.Initialize need to be called before Scan_Compiler_Arguments,
263 -- because it initializes a table filled by Scan_Compiler_Arguments.
269 Scan_Compiler_Arguments;
270 Osint.Add_Default_Search_Dirs;
288 Sem_Type.Init_Interp_Tables;
290 -- Acquire target parameters from system.ads (source of package System)
295 S : Source_File_Index;
299 Name_Buffer (1 .. 10) := "system.ads";
302 S := Load_Source_File (N);
304 if S = No_Source_File then
306 ("fatal error, run-time library not installed correctly");
308 ("cannot locate file system.ads");
309 raise Unrecoverable_Error;
311 -- Remember source index of system.ads (which was read successfully)
314 System_Source_File_Index := S;
317 Targparm.Get_Target_Parameters
318 (System_Text => Source_Text (S),
319 Source_First => Source_First (S),
320 Source_Last => Source_Last (S));
322 -- Acquire configuration pragma information from Targparm
324 Restrict.Restrictions := Targparm.Restrictions_On_Target;
327 -- Set Configurable_Run_Time mode if system.ads flag set
329 if Targparm.Configurable_Run_Time_On_Target or Debug_Flag_YY then
330 Configurable_Run_Time_Mode := True;
333 -- Set -gnatR3m mode if debug flag A set
335 if Debug_Flag_AA then
336 Back_Annotate_Rep_Info := True;
337 List_Representation_Info := 1;
338 List_Representation_Info_Mechanisms := True;
341 -- Output copyright notice if full list mode unless we have a list
342 -- file, in which case we defer this so that it is output in the file
344 if (Verbose_Mode or else (Full_List and then Full_List_File_Name = null))
345 and then not Debug_Flag_7
349 Write_Str (Gnat_Version_String);
351 Write_Str ("Copyright 1992-" &
353 ", Free Software Foundation, Inc.");
357 -- Before we do anything else, adjust certain global values for
358 -- debug switches which modify their normal natural settings.
361 Ttypes.Bytes_Big_Endian := not Ttypes.Bytes_Big_Endian;
365 Targparm.OpenVMS_On_Target := True;
366 Hostparm.OpenVMS := True;
369 if Debug_Flag_FF then
370 Targparm.Frontend_Layout_On_Target := True;
373 -- We take the default exception mechanism into account
375 if Targparm.ZCX_By_Default_On_Target then
376 if Targparm.GCC_ZCX_Support_On_Target then
377 Exception_Mechanism := Back_End_Exceptions;
380 ("Zero Cost Exceptions not supported on this target");
384 -- Set proper status for overflow checks. We turn on overflow checks
385 -- if -gnatp was not specified, and either -gnato is set or the back
386 -- end takes care of overflow checks. Otherwise we suppress overflow
387 -- checks by default (since front end checks are expensive).
389 if not Opt.Suppress_Checks
390 and then (Opt.Enable_Overflow_Checks
392 (Targparm.Backend_Divide_Checks_On_Target
394 Targparm.Backend_Overflow_Checks_On_Target))
396 Suppress_Options (Overflow_Check) := False;
398 Suppress_Options (Overflow_Check) := True;
401 -- Check we do not have more than one source file, this happens only in
402 -- the case where the driver is called directly, it cannot happen when
403 -- gnat1 is invoked from gcc in the normal case.
405 if Osint.Number_Of_Files /= 1 then
408 Osint.Fail ("you must provide one source file");
410 elsif Usage_Requested then
414 Original_Operating_Mode := Operating_Mode;
417 -- Exit with errors if the main source could not be parsed
419 if Sinput.Main_Source_File = No_Source_File then
421 Errout.Output_Messages;
422 Exit_Program (E_Errors);
425 Main_Unit_Node := Cunit (Main_Unit);
426 Main_Kind := Nkind (Unit (Main_Unit_Node));
429 -- Exit if compilation errors detected
433 if Compilation_Errors then
435 Sem_Ch13.Validate_Unchecked_Conversions;
436 Errout.Output_Messages;
439 -- Generate ALI file if specially requested
441 if Opt.Force_ALI_Tree_File then
442 Write_ALI (Object => False);
446 Exit_Program (E_Errors);
449 -- Set Generate_Code on main unit and its spec. We do this even if are
450 -- not generating code, since Lib-Writ uses this to determine which
451 -- units get written in the ali file.
453 Set_Generate_Code (Main_Unit);
455 -- If we have a corresponding spec, then we need object
456 -- code for the spec unit as well
458 if Nkind (Unit (Main_Unit_Node)) in N_Unit_Body
459 and then not Acts_As_Spec (Main_Unit_Node)
462 (Get_Cunit_Unit_Number (Library_Unit (Main_Unit_Node)));
465 -- Case of no code required to be generated, exit indicating no error
467 if Original_Operating_Mode = Check_Syntax then
470 Errout.Output_Messages;
475 -- Use a goto instead of calling Exit_Program so that finalization
480 elsif Original_Operating_Mode = Check_Semantics then
481 Back_End_Mode := Declarations_Only;
483 -- All remaining cases are cases in which the user requested that code
484 -- be generated (i.e. no -gnatc or -gnats switch was used). Check if
485 -- we can in fact satisfy this request.
487 -- Cannot generate code if someone has turned off code generation for
488 -- any reason at all. We will try to figure out a reason below.
490 elsif Operating_Mode /= Generate_Code then
491 Back_End_Mode := Skip;
493 -- We can generate code for a subprogram body unless there were missing
494 -- subunits. Note that we always generate code for all generic units (a
495 -- change from some previous versions of GNAT).
497 elsif Main_Kind = N_Subprogram_Body
498 and then not Subunits_Missing
500 Back_End_Mode := Generate_Object;
502 -- We can generate code for a package body unless there are subunits
503 -- missing (note that we always generate code for generic units, which
504 -- is a change from some earlier versions of GNAT).
506 elsif Main_Kind = N_Package_Body
507 and then not Subunits_Missing
509 Back_End_Mode := Generate_Object;
511 -- We can generate code for a package declaration or a subprogram
512 -- declaration only if it does not required a body.
514 elsif (Main_Kind = N_Package_Declaration
516 Main_Kind = N_Subprogram_Declaration)
518 (not Body_Required (Main_Unit_Node)
520 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
522 Back_End_Mode := Generate_Object;
524 -- We can generate code for a generic package declaration of a generic
525 -- subprogram declaration only if does not require a body.
527 elsif (Main_Kind = N_Generic_Package_Declaration
529 Main_Kind = N_Generic_Subprogram_Declaration)
530 and then not Body_Required (Main_Unit_Node)
532 Back_End_Mode := Generate_Object;
534 -- Compilation units that are renamings do not require bodies,
535 -- so we can generate code for them.
537 elsif Main_Kind = N_Package_Renaming_Declaration
538 or else Main_Kind = N_Subprogram_Renaming_Declaration
540 Back_End_Mode := Generate_Object;
542 -- Compilation units that are generic renamings do not require bodies
543 -- so we can generate code for them.
545 elsif Main_Kind in N_Generic_Renaming_Declaration then
546 Back_End_Mode := Generate_Object;
548 -- In all other cases (specs which have bodies, generics, and bodies
549 -- where subunits are missing), we cannot generate code and we generate
550 -- a warning message. Note that generic instantiations are gone at this
551 -- stage since they have been replaced by their instances.
554 Back_End_Mode := Skip;
557 -- At this stage Call_Back_End is set to indicate if the backend should
558 -- be called to generate code. If it is not set, then code generation
559 -- has been turned off, even though code was requested by the original
560 -- command. This is not an error from the user point of view, but it is
561 -- an error from the point of view of the gcc driver, so we must exit
562 -- with an error status.
564 -- We generate an informative message (from the gcc point of view, it
565 -- is an error message, but from the users point of view this is not an
566 -- error, just a consequence of compiling something that cannot
569 if Back_End_Mode = Skip then
570 Write_Str ("cannot generate code for ");
572 Write_Name (Unit_File_Name (Main_Unit));
574 if Subunits_Missing then
575 Write_Str (" (missing subunits)");
577 Write_Str ("to check parent unit");
579 elsif Main_Kind = N_Subunit then
580 Write_Str (" (subunit)");
582 Write_Str ("to check subunit");
584 elsif Main_Kind = N_Subprogram_Declaration then
585 Write_Str (" (subprogram spec)");
587 Write_Str ("to check subprogram spec");
589 -- Generic package body in GNAT implementation mode
591 elsif Main_Kind = N_Package_Body and then GNAT_Mode then
592 Write_Str (" (predefined generic)");
594 Write_Str ("to check predefined generic");
596 -- Only other case is a package spec
599 Write_Str (" (package spec)");
601 Write_Str ("to check package spec");
604 Write_Str (" for errors, use ");
606 if Hostparm.OpenVMS then
607 Write_Str ("/NOLOAD");
609 Write_Str ("-gnatc");
614 Sem_Ch13.Validate_Unchecked_Conversions;
616 Errout.Output_Messages;
619 Write_ALI (Object => False);
623 -- Exit program with error indication, to kill object file
625 Exit_Program (E_No_Code);
628 -- In -gnatc mode, we only do annotation if -gnatt or -gnatR is also
629 -- set as indicated by Back_Annotate_Rep_Info being set to True.
631 -- We don't call for annotations on a subunit, because to process those
632 -- the back-end requires that the parent(s) be properly compiled.
634 -- Annotation is suppressed for targets where front-end layout is
635 -- enabled, because the front end determines representations.
637 -- Annotation is also suppressed in the case of compiling for
638 -- a VM, since representations are largely symbolic there.
640 if Back_End_Mode = Declarations_Only
641 and then (not Back_Annotate_Rep_Info
642 or else Main_Kind = N_Subunit
643 or else Targparm.Frontend_Layout_On_Target
644 or else Targparm.VM_Target /= No_VM)
646 Sem_Ch13.Validate_Unchecked_Conversions;
648 Errout.Output_Messages;
649 Write_ALI (Object => False);
657 -- Ensure that we properly register a dependency on system.ads, since
658 -- even if we do not semantically depend on this, Targparm has read
659 -- system parameters from the system.ads file.
661 Lib.Writ.Ensure_System_Dependency;
663 -- Add dependencies, if any, on preprocessing data file and on
664 -- preprocessing definition file(s).
666 Prepcomp.Add_Dependencies;
668 -- Back end needs to explicitly unlock tables it needs to touch
681 -- Here we call the back end to generate the output code
683 Generating_Code := True;
684 Back_End.Call_Back_End (Back_End_Mode);
686 -- Once the backend is complete, we unlock the names table. This call
687 -- allows a few extra entries, needed for example for the file name for
688 -- the library file output.
692 -- Validate unchecked conversions (using the values for size and
693 -- alignment annotated by the backend where possible).
695 Sem_Ch13.Validate_Unchecked_Conversions;
697 -- Now we complete output of errors, rep info and the tree info. These
698 -- are delayed till now, since it is perfectly possible for gigi to
699 -- generate errors, modify the tree (in particular by setting flags
700 -- indicating that elaboration is required, and also to back annotate
701 -- representation information for List_Rep_Info.
704 Errout.Output_Messages;
707 -- Only write the library if the backend did not generate any error
708 -- messages. Otherwise signal errors to the driver program so that
709 -- there will be no attempt to generate an object file.
711 if Compilation_Errors then
713 Exit_Program (E_Errors);
716 Write_ALI (Object => (Back_End_Mode = Generate_Object));
718 -- Generate the ASIS tree after writing the ALI file, since in ASIS
719 -- mode, Write_ALI may in fact result in further tree decoration from
720 -- the original tree file. Note that we dump the tree just before
721 -- generating it, so that the dump will exactly reflect what is written
727 -- Finalize name table and we are all done
732 -- Handle fatal internal compiler errors
734 when Rtsfind.RE_Not_Available =>
735 Comperr.Compiler_Abort ("RE_Not_Available");
737 when System.Assertions.Assert_Failure =>
738 Comperr.Compiler_Abort ("Assert_Failure");
740 when Constraint_Error =>
741 Comperr.Compiler_Abort ("Constraint_Error");
743 when Program_Error =>
744 Comperr.Compiler_Abort ("Program_Error");
746 when Storage_Error =>
748 -- Assume this is a bug. If it is real, the message will in any case
749 -- say Storage_Error, giving a strong hint!
751 Comperr.Compiler_Abort ("Storage_Error");
757 -- The outer exception handles an unrecoverable error
760 when Unrecoverable_Error =>
762 Errout.Output_Messages;
765 Write_Str ("compilation abandoned");
771 Exit_Program (E_Errors);