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 Atree; use Atree;
27 with Back_End; use Back_End;
29 with Csets; use Csets;
30 with Debug; use Debug;
32 with Errout; use Errout;
34 with Fname; use Fname;
35 with Fname.UF; use Fname.UF;
37 with Gnatvsn; use Gnatvsn;
41 with Lib.Writ; use Lib.Writ;
43 with Namet; use Namet;
46 with Osint; use Osint;
47 with Output; use Output;
49 with Repinfo; use Repinfo;
59 with Sinfo; use Sinfo;
60 with Sinput.L; use Sinput.L;
62 with Sprint; use Sprint;
64 with Stylesw; use Stylesw;
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;
74 with Validsw; use Validsw;
76 with System.Assertions;
79 Main_Unit_Node : Node_Id;
80 -- Compilation unit node for main unit
82 Main_Kind : Node_Kind;
83 -- Kind of main compilation unit node
85 Back_End_Mode : Back_End.Back_End_Mode_Type;
86 -- Record back end mode
88 procedure Adjust_Global_Switches;
89 -- There are various interactions between front end switch settings,
90 -- including debug switch settings and target dependent parameters.
91 -- This procedure takes care of properly handling these interactions.
92 -- We do it after scanning out all the switches, so that we are not
93 -- depending on the order in which switches appear.
95 procedure Check_Bad_Body;
96 -- Called to check if the unit we are compiling has a bad body
98 procedure Check_Rep_Info;
99 -- Called when we are not generating code, to check if -gnatR was requested
100 -- and if so, explain that we will not be honoring the request.
102 procedure Check_Library_Items;
103 -- For debugging -- checks the behavior of Walk_Library_Items
104 pragma Warnings (Off, Check_Library_Items);
105 -- In case the call below is commented out
107 ----------------------------
108 -- Adjust_Global_Switches --
109 ----------------------------
111 procedure Adjust_Global_Switches is
113 -- Debug flag -gnatd.I is a synonym of Generate_SCIL
115 if Debug_Flag_Dot_II then
116 Generate_SCIL := True;
119 -- Set ASIS mode if -gnatt and -gnatc are set
121 if Operating_Mode = Check_Semantics and then Tree_Output then
124 -- Turn off inlining in ASIS mode, since ASIS cannot handle the extra
125 -- information in the trees caused by inlining being active.
127 -- More specifically, the tree seems to be malformed from the ASIS
128 -- point of view if -gnatc and -gnatn appear together???
130 Inline_Active := False;
132 -- Turn off SCIL generation in ASIS mode, since SCIL requires front-
135 Generate_SCIL := False;
138 -- SCIL mode needs to disable front-end inlining since the generated
139 -- trees (in particular order and consistency between specs compiled
140 -- as part of a main unit or as part of a with-clause) are causing
143 if Generate_SCIL then
144 Front_End_Inlining := False;
147 -- Tune settings for optimal SCIL generation in CodePeer_Mode
149 if CodePeer_Mode then
151 -- Turn off inlining, confuses codepeer output and gains nothing
153 Front_End_Inlining := False;
154 Inline_Active := False;
156 -- Turn off ASIS mode: incompatible with front-end expansion.
160 -- Turn off dynamic elaboration checks: generates inconsitencies in
161 -- trees between specs compiled as part of a main unit or as part of
164 Dynamic_Elaboration_Checks := False;
166 -- Suppress overflow checks since this is handled implicitely by
167 -- codepeer. Enable all other language checks.
169 Suppress_Options := (Overflow_Check => True, others => False);
170 Enable_Overflow_Checks := False;
172 -- Kill debug of generated code, since it messes up sloc values
174 Debug_Generated_Code := False;
176 -- Turn cross-referencing on in case it was disabled (by e.g. -gnatD)
177 -- Do we really need to spend time generating xref in codepeer
178 -- mode??? Consider setting Xref_Active to False.
182 -- Polling mode forced off, since it generates confusing junk
184 Polling_Required := False;
186 -- Set operating mode to check semantics with full front-end
187 -- expansion, but no back-end code generation.
189 Operating_Mode := Check_Semantics;
190 Debug_Flag_X := True;
192 -- We need SCIL generation of course
194 Generate_SCIL := True;
196 -- Enable assertions and debug pragmas, since they give codepeer
197 -- valuable extra information.
199 Assertions_Enabled := True;
200 Debug_Pragmas_Enabled := True;
202 -- Suppress compiler warnings, since what we are interested in here
203 -- is what codepeer can find out. Also disable all simple value
204 -- propagation. This is an optimization which is valuable for code
205 -- optimization, and also for generation of compiler warnings, but
206 -- these are being turned off anyway, and codepeer understands
207 -- things more clearly if references are not optimized in this way.
209 Warning_Mode := Suppress;
210 Debug_Flag_MM := True;
212 -- Set normal RM validity checking, and checking of IN OUT parameters
213 -- (this might give codepeer more useful checks to analyze, to be
214 -- confirmed???). All other validity checking is turned off, since
215 -- this can generate very complex trees that only confuse codepeer
216 -- and do not bring enough useful info.
218 Reset_Validity_Check_Options;
219 Validity_Check_Default := True;
220 Validity_Check_In_Out_Params := True;
221 Validity_Check_In_Params := True;
223 -- Turn off style check options since we are not interested in any
224 -- front-end warnings when we are getting code peer output.
226 Reset_Style_Check_Options;
229 -- Set Configurable_Run_Time mode if system.ads flag set
231 if Targparm.Configurable_Run_Time_On_Target or Debug_Flag_YY then
232 Configurable_Run_Time_Mode := True;
235 -- Set -gnatR3m mode if debug flag A set
237 if Debug_Flag_AA then
238 Back_Annotate_Rep_Info := True;
239 List_Representation_Info := 1;
240 List_Representation_Info_Mechanisms := True;
243 -- Force Target_Strict_Alignment true if debug flag -gnatd.a is set
245 if Debug_Flag_Dot_A then
246 Ttypes.Target_Strict_Alignment := True;
249 -- Disable static allocation of dispatch tables if -gnatd.t or if layout
250 -- is enabled. The front end's layout phase currently treats types that
251 -- have discriminant-dependent arrays as not being static even when a
252 -- discriminant constraint on the type is static, and this leads to
253 -- problems with subtypes of type Ada.Tags.Dispatch_Table_Wrapper. ???
255 if Debug_Flag_Dot_T or else Frontend_Layout_On_Target then
256 Static_Dispatch_Tables := False;
259 -- Flip endian mode if -gnatd8 set
262 Ttypes.Bytes_Big_Endian := not Ttypes.Bytes_Big_Endian;
265 -- Deal with forcing OpenVMS switches True if debug flag M is set, but
266 -- record the setting of Targparm.Open_VMS_On_Target in True_VMS_Target
267 -- before doing this, so we know if we are in real OpenVMS or not!
269 Opt.True_VMS_Target := Targparm.OpenVMS_On_Target;
272 Targparm.OpenVMS_On_Target := True;
273 Hostparm.OpenVMS := True;
276 -- Activate front end layout if debug flag -gnatdF is set
278 if Debug_Flag_FF then
279 Targparm.Frontend_Layout_On_Target := True;
282 -- Set and check exception mechnism
284 if Targparm.ZCX_By_Default_On_Target then
285 if Targparm.GCC_ZCX_Support_On_Target then
286 Exception_Mechanism := Back_End_Exceptions;
288 Osint.Fail ("Zero Cost Exceptions not supported on this target");
292 -- Set proper status for overflow checks. We turn on overflow checks
293 -- if -gnatp was not specified, and either -gnato is set or the back
294 -- end takes care of overflow checks. Otherwise we suppress overflow
295 -- checks by default (since front end checks are expensive).
297 if not Opt.Suppress_Checks
298 and then (Opt.Enable_Overflow_Checks
300 (Targparm.Backend_Divide_Checks_On_Target
302 Targparm.Backend_Overflow_Checks_On_Target))
304 Suppress_Options (Overflow_Check) := False;
306 Suppress_Options (Overflow_Check) := True;
308 end Adjust_Global_Switches;
314 procedure Check_Bad_Body is
315 Sname : Unit_Name_Type;
316 Src_Ind : Source_File_Index;
317 Fname : File_Name_Type;
319 procedure Bad_Body_Error (Msg : String);
320 -- Issue message for bad body found
326 procedure Bad_Body_Error (Msg : String) is
328 Error_Msg_N (Msg, Main_Unit_Node);
329 Error_Msg_File_1 := Fname;
330 Error_Msg_N ("remove incorrect body in file{!", Main_Unit_Node);
333 -- Start of processing for Check_Bad_Body
336 -- Nothing to do if we are only checking syntax, because we don't know
337 -- enough to know if we require or forbid a body in this case.
339 if Operating_Mode = Check_Syntax then
343 -- Check for body not allowed
345 if (Main_Kind = N_Package_Declaration
346 and then not Body_Required (Main_Unit_Node))
347 or else (Main_Kind = N_Generic_Package_Declaration
348 and then not Body_Required (Main_Unit_Node))
349 or else Main_Kind = N_Package_Renaming_Declaration
350 or else Main_Kind = N_Subprogram_Renaming_Declaration
351 or else Nkind (Original_Node (Unit (Main_Unit_Node)))
352 in N_Generic_Instantiation
354 Sname := Unit_Name (Main_Unit);
356 -- If we do not already have a body name, then get the body name
357 -- (but how can we have a body name here ???)
359 if not Is_Body_Name (Sname) then
360 Sname := Get_Body_Name (Sname);
363 Fname := Get_File_Name (Sname, Subunit => False);
364 Src_Ind := Load_Source_File (Fname);
366 -- Case where body is present and it is not a subunit. Exclude
367 -- the subunit case, because it has nothing to do with the
368 -- package we are compiling. It is illegal for a child unit and a
369 -- subunit with the same expanded name (RM 10.2(9)) to appear
370 -- together in a partition, but there is nothing to stop a
371 -- compilation environment from having both, and the test here
372 -- simply allows that. If there is an attempt to include both in
373 -- a partition, this is diagnosed at bind time. In Ada 83 mode
374 -- this is not a warning case.
376 -- Note: if weird file names are being used, we can have
377 -- situation where the file name that supposedly contains body,
378 -- in fact contains a spec, or we can't tell what it contains.
379 -- Skip the error message in these cases.
381 -- Also ignore body that is nothing but pragma No_Body; (that's the
382 -- whole point of this pragma, to be used this way and to cause the
383 -- body file to be ignored in this context).
385 if Src_Ind /= No_Source_File
386 and then Get_Expected_Unit_Type (Fname) = Expect_Body
387 and then not Source_File_Is_Subunit (Src_Ind)
388 and then not Source_File_Is_No_Body (Src_Ind)
390 Errout.Finalize (Last_Call => False);
392 Error_Msg_Unit_1 := Sname;
394 -- Ada 83 case of a package body being ignored. This is not an
395 -- error as far as the Ada 83 RM is concerned, but it is almost
396 -- certainly not what is wanted so output a warning. Give this
397 -- message only if there were no errors, since otherwise it may
398 -- be incorrect (we may have misinterpreted a junk spec as not
399 -- needing a body when it really does).
401 if Main_Kind = N_Package_Declaration
402 and then Ada_Version = Ada_83
403 and then Operating_Mode = Generate_Code
404 and then Distribution_Stub_Mode /= Generate_Caller_Stub_Body
405 and then not Compilation_Errors
408 ("package $$ does not require a body?", Main_Unit_Node);
409 Error_Msg_File_1 := Fname;
410 Error_Msg_N ("body in file{? will be ignored", Main_Unit_Node);
412 -- Ada 95 cases of a body file present when no body is
413 -- permitted. This we consider to be an error.
416 -- For generic instantiations, we never allow a body
418 if Nkind (Original_Node (Unit (Main_Unit_Node)))
419 in N_Generic_Instantiation
422 ("generic instantiation for $$ does not allow a body");
424 -- A library unit that is a renaming never allows a body
426 elsif Main_Kind in N_Renaming_Declaration then
428 ("renaming declaration for $$ does not allow a body!");
430 -- Remaining cases are packages and generic packages. Here
431 -- we only do the test if there are no previous errors,
432 -- because if there are errors, they may lead us to
433 -- incorrectly believe that a package does not allow a body
434 -- when in fact it does.
436 elsif not Compilation_Errors then
437 if Main_Kind = N_Package_Declaration then
439 ("package $$ does not allow a body!");
441 elsif Main_Kind = N_Generic_Package_Declaration then
443 ("generic package $$ does not allow a body!");
456 procedure Check_Rep_Info is
458 if List_Representation_Info /= 0
459 or else List_Representation_Info_Mechanisms
464 ("cannot generate representation information, no code generated");
471 -------------------------
472 -- Check_Library_Items --
473 -------------------------
475 -- Walk_Library_Items has plenty of assertions, so all we need to do is
476 -- call it, just for these assertions, not actually doing anything else.
478 procedure Check_Library_Items is
480 procedure Action (Item : Node_Id);
481 -- Action passed to Walk_Library_Items to do nothing
487 procedure Action (Item : Node_Id) is
492 procedure Walk is new Sem.Walk_Library_Items (Action);
494 -- Start of processing for Check_Library_Items
498 end Check_Library_Items;
500 -- Start of processing for Gnat1drv
503 -- This inner block is set up to catch assertion errors and constraint
504 -- errors. Since the code for handling these errors can cause another
505 -- exception to be raised (namely Unrecoverable_Error), we need two
506 -- nested blocks, so that the outer one handles unrecoverable error.
509 -- Lib.Initialize need to be called before Scan_Compiler_Arguments,
510 -- because it initializes a table filled by Scan_Compiler_Arguments.
516 Scan_Compiler_Arguments;
517 Osint.Add_Default_Search_Dirs;
535 Sem_Type.Init_Interp_Tables;
537 -- Acquire target parameters from system.ads (source of package System)
542 S : Source_File_Index;
546 Name_Buffer (1 .. 10) := "system.ads";
549 S := Load_Source_File (N);
551 if S = No_Source_File then
553 ("fatal error, run-time library not installed correctly");
555 ("cannot locate file system.ads");
556 raise Unrecoverable_Error;
558 -- Remember source index of system.ads (which was read successfully)
561 System_Source_File_Index := S;
564 Targparm.Get_Target_Parameters
565 (System_Text => Source_Text (S),
566 Source_First => Source_First (S),
567 Source_Last => Source_Last (S));
569 -- Acquire configuration pragma information from Targparm
571 Restrict.Restrictions := Targparm.Restrictions_On_Target;
574 Adjust_Global_Switches;
576 -- Output copyright notice if full list mode unless we have a list
577 -- file, in which case we defer this so that it is output in the file
579 if (Verbose_Mode or else (Full_List and then Full_List_File_Name = null))
580 and then not Debug_Flag_7
584 Write_Str (Gnat_Version_String);
586 Write_Str ("Copyright 1992-" &
588 ", Free Software Foundation, Inc.");
592 -- Check we do not have more than one source file, this happens only in
593 -- the case where the driver is called directly, it cannot happen when
594 -- gnat1 is invoked from gcc in the normal case.
596 if Osint.Number_Of_Files /= 1 then
599 Osint.Fail ("you must provide one source file");
601 elsif Usage_Requested then
605 Original_Operating_Mode := Operating_Mode;
608 -- Exit with errors if the main source could not be parsed
610 if Sinput.Main_Source_File = No_Source_File then
611 Errout.Finalize (Last_Call => True);
612 Errout.Output_Messages;
613 Exit_Program (E_Errors);
616 Main_Unit_Node := Cunit (Main_Unit);
617 Main_Kind := Nkind (Unit (Main_Unit_Node));
620 -- Exit if compilation errors detected
622 Errout.Finalize (Last_Call => False);
624 if Compilation_Errors then
626 Sem_Ch13.Validate_Unchecked_Conversions;
627 Sem_Ch13.Validate_Address_Clauses;
628 Errout.Output_Messages;
631 -- Generate ALI file if specially requested
633 if Opt.Force_ALI_Tree_File then
634 Write_ALI (Object => False);
638 Errout.Finalize (Last_Call => True);
639 Exit_Program (E_Errors);
642 -- Set Generate_Code on main unit and its spec. We do this even if are
643 -- not generating code, since Lib-Writ uses this to determine which
644 -- units get written in the ali file.
646 Set_Generate_Code (Main_Unit);
648 -- If we have a corresponding spec, and it comes from source
649 -- or it is not a generated spec for a child subprogram body,
650 -- then we need object code for the spec unit as well.
652 if Nkind (Unit (Main_Unit_Node)) in N_Unit_Body
653 and then not Acts_As_Spec (Main_Unit_Node)
655 if Nkind (Unit (Main_Unit_Node)) = N_Subprogram_Body
656 and then not Comes_From_Source (Library_Unit (Main_Unit_Node))
661 (Get_Cunit_Unit_Number (Library_Unit (Main_Unit_Node)));
665 -- Case of no code required to be generated, exit indicating no error
667 if Original_Operating_Mode = Check_Syntax then
669 Errout.Finalize (Last_Call => True);
670 Errout.Output_Messages;
675 -- Use a goto instead of calling Exit_Program so that finalization
680 elsif Original_Operating_Mode = Check_Semantics then
681 Back_End_Mode := Declarations_Only;
683 -- All remaining cases are cases in which the user requested that code
684 -- be generated (i.e. no -gnatc or -gnats switch was used). Check if
685 -- we can in fact satisfy this request.
687 -- Cannot generate code if someone has turned off code generation for
688 -- any reason at all. We will try to figure out a reason below.
690 elsif Operating_Mode /= Generate_Code then
691 Back_End_Mode := Skip;
693 -- We can generate code for a subprogram body unless there were missing
694 -- subunits. Note that we always generate code for all generic units (a
695 -- change from some previous versions of GNAT).
697 elsif Main_Kind = N_Subprogram_Body
698 and then not Subunits_Missing
700 Back_End_Mode := Generate_Object;
702 -- We can generate code for a package body unless there are subunits
703 -- missing (note that we always generate code for generic units, which
704 -- is a change from some earlier versions of GNAT).
706 elsif Main_Kind = N_Package_Body
707 and then not Subunits_Missing
709 Back_End_Mode := Generate_Object;
711 -- We can generate code for a package declaration or a subprogram
712 -- declaration only if it does not required a body.
714 elsif (Main_Kind = N_Package_Declaration
716 Main_Kind = N_Subprogram_Declaration)
718 (not Body_Required (Main_Unit_Node)
720 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
722 Back_End_Mode := Generate_Object;
724 -- We can generate code for a generic package declaration of a generic
725 -- subprogram declaration only if does not require a body.
727 elsif (Main_Kind = N_Generic_Package_Declaration
729 Main_Kind = N_Generic_Subprogram_Declaration)
730 and then not Body_Required (Main_Unit_Node)
732 Back_End_Mode := Generate_Object;
734 -- Compilation units that are renamings do not require bodies,
735 -- so we can generate code for them.
737 elsif Main_Kind = N_Package_Renaming_Declaration
738 or else Main_Kind = N_Subprogram_Renaming_Declaration
740 Back_End_Mode := Generate_Object;
742 -- Compilation units that are generic renamings do not require bodies
743 -- so we can generate code for them.
745 elsif Main_Kind in N_Generic_Renaming_Declaration then
746 Back_End_Mode := Generate_Object;
748 -- In all other cases (specs which have bodies, generics, and bodies
749 -- where subunits are missing), we cannot generate code and we generate
750 -- a warning message. Note that generic instantiations are gone at this
751 -- stage since they have been replaced by their instances.
754 Back_End_Mode := Skip;
757 -- At this stage Back_End_Mode is set to indicate if the backend should
758 -- be called to generate code. If it is Skip, then code generation has
759 -- been turned off, even though code was requested by the original
760 -- command. This is not an error from the user point of view, but it is
761 -- an error from the point of view of the gcc driver, so we must exit
762 -- with an error status.
764 -- We generate an informative message (from the gcc point of view, it
765 -- is an error message, but from the users point of view this is not an
766 -- error, just a consequence of compiling something that cannot
769 if Back_End_Mode = Skip then
771 Write_Str ("cannot generate code for ");
773 Write_Name (Unit_File_Name (Main_Unit));
775 if Subunits_Missing then
776 Write_Str (" (missing subunits)");
778 Write_Str ("to check parent unit");
780 elsif Main_Kind = N_Subunit then
781 Write_Str (" (subunit)");
783 Write_Str ("to check subunit");
785 elsif Main_Kind = N_Subprogram_Declaration then
786 Write_Str (" (subprogram spec)");
788 Write_Str ("to check subprogram spec");
790 -- Generic package body in GNAT implementation mode
792 elsif Main_Kind = N_Package_Body and then GNAT_Mode then
793 Write_Str (" (predefined generic)");
795 Write_Str ("to check predefined generic");
797 -- Only other case is a package spec
800 Write_Str (" (package spec)");
802 Write_Str ("to check package spec");
805 Write_Str (" for errors, use ");
807 if Hostparm.OpenVMS then
808 Write_Str ("/NOLOAD");
810 Write_Str ("-gnatc");
816 Sem_Ch13.Validate_Unchecked_Conversions;
817 Sem_Ch13.Validate_Address_Clauses;
818 Errout.Finalize (Last_Call => True);
819 Errout.Output_Messages;
822 Write_ALI (Object => False);
826 -- Exit program with error indication, to kill object file
828 Exit_Program (E_No_Code);
831 -- In -gnatc mode, we only do annotation if -gnatt or -gnatR is also
832 -- set as indicated by Back_Annotate_Rep_Info being set to True.
834 -- We don't call for annotations on a subunit, because to process those
835 -- the back-end requires that the parent(s) be properly compiled.
837 -- Annotation is suppressed for targets where front-end layout is
838 -- enabled, because the front end determines representations.
840 -- Annotation is also suppressed in the case of compiling for
841 -- a VM, since representations are largely symbolic there.
843 if Back_End_Mode = Declarations_Only
844 and then (not (Back_Annotate_Rep_Info or Generate_SCIL)
845 or else Main_Kind = N_Subunit
846 or else Targparm.Frontend_Layout_On_Target
847 or else Targparm.VM_Target /= No_VM)
849 Sem_Ch13.Validate_Unchecked_Conversions;
850 Sem_Ch13.Validate_Address_Clauses;
851 Errout.Finalize (Last_Call => True);
852 Errout.Output_Messages;
853 Write_ALI (Object => False);
861 -- Ensure that we properly register a dependency on system.ads, since
862 -- even if we do not semantically depend on this, Targparm has read
863 -- system parameters from the system.ads file.
865 Lib.Writ.Ensure_System_Dependency;
867 -- Add dependencies, if any, on preprocessing data file and on
868 -- preprocessing definition file(s).
870 Prepcomp.Add_Dependencies;
872 -- Back end needs to explicitly unlock tables it needs to touch
885 -- ???Check_Library_Items under control of a debug flag, because it
886 -- currently does not work if the -gnatn switch (back end inlining) is
889 if Debug_Flag_Dot_WW then
893 -- Here we call the back end to generate the output code
895 Generating_Code := True;
896 Back_End.Call_Back_End (Back_End_Mode);
898 -- Once the backend is complete, we unlock the names table. This call
899 -- allows a few extra entries, needed for example for the file name for
900 -- the library file output.
904 -- Validate unchecked conversions (using the values for size and
905 -- alignment annotated by the backend where possible).
907 Sem_Ch13.Validate_Unchecked_Conversions;
909 -- Validate address clauses (again using alignment values annotated
910 -- by the backend where possible).
912 Sem_Ch13.Validate_Address_Clauses;
914 -- Now we complete output of errors, rep info and the tree info. These
915 -- are delayed till now, since it is perfectly possible for gigi to
916 -- generate errors, modify the tree (in particular by setting flags
917 -- indicating that elaboration is required, and also to back annotate
918 -- representation information for List_Rep_Info.
920 Errout.Finalize (Last_Call => True);
921 Errout.Output_Messages;
924 -- Only write the library if the backend did not generate any error
925 -- messages. Otherwise signal errors to the driver program so that
926 -- there will be no attempt to generate an object file.
928 if Compilation_Errors then
930 Exit_Program (E_Errors);
933 Write_ALI (Object => (Back_End_Mode = Generate_Object));
935 -- Generate the ASIS tree after writing the ALI file, since in ASIS
936 -- mode, Write_ALI may in fact result in further tree decoration from
937 -- the original tree file. Note that we dump the tree just before
938 -- generating it, so that the dump will exactly reflect what is written
944 -- Finalize name table and we are all done
949 -- Handle fatal internal compiler errors
951 when Rtsfind.RE_Not_Available =>
952 Comperr.Compiler_Abort ("RE_Not_Available");
954 when System.Assertions.Assert_Failure =>
955 Comperr.Compiler_Abort ("Assert_Failure");
957 when Constraint_Error =>
958 Comperr.Compiler_Abort ("Constraint_Error");
960 when Program_Error =>
961 Comperr.Compiler_Abort ("Program_Error");
963 when Storage_Error =>
965 -- Assume this is a bug. If it is real, the message will in any case
966 -- say Storage_Error, giving a strong hint!
968 Comperr.Compiler_Abort ("Storage_Error");
974 -- The outer exception handles an unrecoverable error
977 when Unrecoverable_Error =>
978 Errout.Finalize (Last_Call => True);
979 Errout.Output_Messages;
982 Write_Str ("compilation abandoned");
988 Exit_Program (E_Errors);