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;
50 with Repinfo; use Repinfo;
61 with Sinfo; use Sinfo;
62 with Sinput.L; use Sinput.L;
64 with Sprint; use Sprint;
66 with Stylesw; use Stylesw;
67 with Targparm; use Targparm;
69 with Treepr; use Treepr;
71 with Types; use Types;
72 with Uintp; use Uintp;
73 with Uname; use Uname;
76 with Validsw; use Validsw;
78 with System.Assertions;
81 Main_Unit_Node : Node_Id;
82 -- Compilation unit node for main unit
84 Main_Kind : Node_Kind;
85 -- Kind of main compilation unit node
87 Back_End_Mode : Back_End.Back_End_Mode_Type;
88 -- Record back end mode
90 procedure Adjust_Global_Switches;
91 -- There are various interactions between front end switch settings,
92 -- including debug switch settings and target dependent parameters.
93 -- This procedure takes care of properly handling these interactions.
94 -- We do it after scanning out all the switches, so that we are not
95 -- depending on the order in which switches appear.
97 procedure Check_Bad_Body;
98 -- Called to check if the unit we are compiling has a bad body
100 procedure Check_Rep_Info;
101 -- Called when we are not generating code, to check if -gnatR was requested
102 -- and if so, explain that we will not be honoring the request.
104 procedure Check_Library_Items;
105 -- For debugging -- checks the behavior of Walk_Library_Items
106 pragma Warnings (Off, Check_Library_Items);
107 -- In case the call below is commented out
109 ----------------------------
110 -- Adjust_Global_Switches --
111 ----------------------------
113 procedure Adjust_Global_Switches is
115 -- Debug flag -gnatd.I is a synonym for Generate_SCIL and requires code
119 and then Operating_Mode = Generate_Code
121 Generate_SCIL := True;
124 -- Set ASIS mode if -gnatt and -gnatc are set
126 if Operating_Mode = Check_Semantics and then Tree_Output then
129 -- Turn off inlining in ASIS mode, since ASIS cannot handle the extra
130 -- information in the trees caused by inlining being active.
132 -- More specifically, the tree seems to be malformed from the ASIS
133 -- point of view if -gnatc and -gnatn appear together???
135 Inline_Active := False;
137 -- Turn off SCIL generation in ASIS mode, since SCIL requires front-
140 Generate_SCIL := False;
143 -- SCIL mode needs to disable front-end inlining since the generated
144 -- trees (in particular order and consistency between specs compiled
145 -- as part of a main unit or as part of a with-clause) are causing
148 if Generate_SCIL then
149 Front_End_Inlining := False;
152 -- Tune settings for optimal SCIL generation in CodePeer_Mode
154 if CodePeer_Mode then
156 -- Turn off inlining, confuses CodePeer output and gains nothing
158 Front_End_Inlining := False;
159 Inline_Active := False;
161 -- Turn off ASIS mode: incompatible with front-end expansion
165 -- Disable specific expansions for Restrictions pragmas to avoid
166 -- tree inconsistencies between compilations with different pragmas
167 -- that will cause different SCIL files to be generated for the
170 Treat_Restrictions_As_Warnings := True;
172 -- Suppress overflow, division by zero and access checks since they
173 -- are handled implicitly by CodePeer.
175 -- Turn off dynamic elaboration checks: generates inconsistencies in
176 -- trees between specs compiled as part of a main unit or as part of
179 -- Turn off alignment checks: these cannot be proved statically by
180 -- CodePeer and generate false positives.
182 -- Enable all other language checks
185 (Access_Check => True,
186 Alignment_Check => True,
187 Division_Check => True,
188 Elaboration_Check => True,
189 Overflow_Check => True,
191 Enable_Overflow_Checks := False;
192 Dynamic_Elaboration_Checks := False;
194 -- Kill debug of generated code, since it messes up sloc values
196 Debug_Generated_Code := False;
198 -- Turn cross-referencing on in case it was disabled (by e.g. -gnatD)
199 -- Do we really need to spend time generating xref in CodePeer
200 -- mode??? Consider setting Xref_Active to False.
204 -- Polling mode forced off, since it generates confusing junk
206 Polling_Required := False;
208 -- Set operating mode to Generate_Code to benefit from full
209 -- front-end expansion (e.g. generics).
211 Operating_Mode := Generate_Code;
213 -- We need SCIL generation of course
215 Generate_SCIL := True;
217 -- Enable assertions and debug pragmas, since they give CodePeer
218 -- valuable extra information.
220 Assertions_Enabled := True;
221 Debug_Pragmas_Enabled := True;
223 -- Suppress compiler warnings, since what we are interested in here
224 -- is what CodePeer can find out. Also disable all simple value
225 -- propagation. This is an optimization which is valuable for code
226 -- optimization, and also for generation of compiler warnings, but
227 -- these are being turned off anyway, and CodePeer understands
228 -- things more clearly if references are not optimized in this way.
230 Warning_Mode := Suppress;
231 Debug_Flag_MM := True;
233 -- Set normal RM validity checking, and checking of IN OUT parameters
234 -- (this might give CodePeer more useful checks to analyze, to be
235 -- confirmed???). All other validity checking is turned off, since
236 -- this can generate very complex trees that only confuse CodePeer
237 -- and do not bring enough useful info.
239 Reset_Validity_Check_Options;
240 Validity_Check_Default := True;
241 Validity_Check_In_Out_Params := True;
242 Validity_Check_In_Params := True;
244 -- Turn off style check options since we are not interested in any
245 -- front-end warnings when we are getting CodePeer output.
247 Reset_Style_Check_Options;
250 -- Set Configurable_Run_Time mode if system.ads flag set
252 if Targparm.Configurable_Run_Time_On_Target or Debug_Flag_YY then
253 Configurable_Run_Time_Mode := True;
256 -- Set -gnatR3m mode if debug flag A set
258 if Debug_Flag_AA then
259 Back_Annotate_Rep_Info := True;
260 List_Representation_Info := 1;
261 List_Representation_Info_Mechanisms := True;
264 -- Force Target_Strict_Alignment true if debug flag -gnatd.a is set
266 if Debug_Flag_Dot_A then
267 Ttypes.Target_Strict_Alignment := True;
270 -- Disable static allocation of dispatch tables if -gnatd.t or if layout
271 -- is enabled. The front end's layout phase currently treats types that
272 -- have discriminant-dependent arrays as not being static even when a
273 -- discriminant constraint on the type is static, and this leads to
274 -- problems with subtypes of type Ada.Tags.Dispatch_Table_Wrapper. ???
276 if Debug_Flag_Dot_T or else Frontend_Layout_On_Target then
277 Static_Dispatch_Tables := False;
280 -- Flip endian mode if -gnatd8 set
283 Ttypes.Bytes_Big_Endian := not Ttypes.Bytes_Big_Endian;
286 -- Deal with forcing OpenVMS switches True if debug flag M is set, but
287 -- record the setting of Targparm.Open_VMS_On_Target in True_VMS_Target
288 -- before doing this, so we know if we are in real OpenVMS or not!
290 Opt.True_VMS_Target := Targparm.OpenVMS_On_Target;
293 Targparm.OpenVMS_On_Target := True;
294 Hostparm.OpenVMS := True;
297 -- Activate front end layout if debug flag -gnatdF is set
299 if Debug_Flag_FF then
300 Targparm.Frontend_Layout_On_Target := True;
303 -- Set and check exception mechnism
305 if Targparm.ZCX_By_Default_On_Target then
306 if Targparm.GCC_ZCX_Support_On_Target then
307 Exception_Mechanism := Back_End_Exceptions;
309 Osint.Fail ("Zero Cost Exceptions not supported on this target");
313 -- Set proper status for overflow checks. We turn on overflow checks
314 -- if -gnatp was not specified, and either -gnato is set or the back
315 -- end takes care of overflow checks. Otherwise we suppress overflow
316 -- checks by default (since front end checks are expensive).
318 if not Opt.Suppress_Checks
319 and then (Opt.Enable_Overflow_Checks
321 (Targparm.Backend_Divide_Checks_On_Target
323 Targparm.Backend_Overflow_Checks_On_Target))
325 Suppress_Options (Overflow_Check) := False;
327 Suppress_Options (Overflow_Check) := True;
329 end Adjust_Global_Switches;
335 procedure Check_Bad_Body is
336 Sname : Unit_Name_Type;
337 Src_Ind : Source_File_Index;
338 Fname : File_Name_Type;
340 procedure Bad_Body_Error (Msg : String);
341 -- Issue message for bad body found
347 procedure Bad_Body_Error (Msg : String) is
349 Error_Msg_N (Msg, Main_Unit_Node);
350 Error_Msg_File_1 := Fname;
351 Error_Msg_N ("remove incorrect body in file{!", Main_Unit_Node);
354 -- Start of processing for Check_Bad_Body
357 -- Nothing to do if we are only checking syntax, because we don't know
358 -- enough to know if we require or forbid a body in this case.
360 if Operating_Mode = Check_Syntax then
364 -- Check for body not allowed
366 if (Main_Kind = N_Package_Declaration
367 and then not Body_Required (Main_Unit_Node))
368 or else (Main_Kind = N_Generic_Package_Declaration
369 and then not Body_Required (Main_Unit_Node))
370 or else Main_Kind = N_Package_Renaming_Declaration
371 or else Main_Kind = N_Subprogram_Renaming_Declaration
372 or else Nkind (Original_Node (Unit (Main_Unit_Node)))
373 in N_Generic_Instantiation
375 Sname := Unit_Name (Main_Unit);
377 -- If we do not already have a body name, then get the body name
378 -- (but how can we have a body name here ???)
380 if not Is_Body_Name (Sname) then
381 Sname := Get_Body_Name (Sname);
384 Fname := Get_File_Name (Sname, Subunit => False);
385 Src_Ind := Load_Source_File (Fname);
387 -- Case where body is present and it is not a subunit. Exclude
388 -- the subunit case, because it has nothing to do with the
389 -- package we are compiling. It is illegal for a child unit and a
390 -- subunit with the same expanded name (RM 10.2(9)) to appear
391 -- together in a partition, but there is nothing to stop a
392 -- compilation environment from having both, and the test here
393 -- simply allows that. If there is an attempt to include both in
394 -- a partition, this is diagnosed at bind time. In Ada 83 mode
395 -- this is not a warning case.
397 -- Note: if weird file names are being used, we can have
398 -- situation where the file name that supposedly contains body,
399 -- in fact contains a spec, or we can't tell what it contains.
400 -- Skip the error message in these cases.
402 -- Also ignore body that is nothing but pragma No_Body; (that's the
403 -- whole point of this pragma, to be used this way and to cause the
404 -- body file to be ignored in this context).
406 if Src_Ind /= No_Source_File
407 and then Get_Expected_Unit_Type (Fname) = Expect_Body
408 and then not Source_File_Is_Subunit (Src_Ind)
409 and then not Source_File_Is_No_Body (Src_Ind)
411 Errout.Finalize (Last_Call => False);
413 Error_Msg_Unit_1 := Sname;
415 -- Ada 83 case of a package body being ignored. This is not an
416 -- error as far as the Ada 83 RM is concerned, but it is almost
417 -- certainly not what is wanted so output a warning. Give this
418 -- message only if there were no errors, since otherwise it may
419 -- be incorrect (we may have misinterpreted a junk spec as not
420 -- needing a body when it really does).
422 if Main_Kind = N_Package_Declaration
423 and then Ada_Version = Ada_83
424 and then Operating_Mode = Generate_Code
425 and then Distribution_Stub_Mode /= Generate_Caller_Stub_Body
426 and then not Compilation_Errors
429 ("package $$ does not require a body?", Main_Unit_Node);
430 Error_Msg_File_1 := Fname;
431 Error_Msg_N ("body in file{? will be ignored", Main_Unit_Node);
433 -- Ada 95 cases of a body file present when no body is
434 -- permitted. This we consider to be an error.
437 -- For generic instantiations, we never allow a body
439 if Nkind (Original_Node (Unit (Main_Unit_Node)))
440 in N_Generic_Instantiation
443 ("generic instantiation for $$ does not allow a body");
445 -- A library unit that is a renaming never allows a body
447 elsif Main_Kind in N_Renaming_Declaration then
449 ("renaming declaration for $$ does not allow a body!");
451 -- Remaining cases are packages and generic packages. Here
452 -- we only do the test if there are no previous errors,
453 -- because if there are errors, they may lead us to
454 -- incorrectly believe that a package does not allow a body
455 -- when in fact it does.
457 elsif not Compilation_Errors then
458 if Main_Kind = N_Package_Declaration then
460 ("package $$ does not allow a body!");
462 elsif Main_Kind = N_Generic_Package_Declaration then
464 ("generic package $$ does not allow a body!");
473 -------------------------
474 -- Check_Library_Items --
475 -------------------------
477 -- Walk_Library_Items has plenty of assertions, so all we need to do is
478 -- call it, just for these assertions, not actually doing anything else.
480 procedure Check_Library_Items is
482 procedure Action (Item : Node_Id);
483 -- Action passed to Walk_Library_Items to do nothing
489 procedure Action (Item : Node_Id) is
494 procedure Walk is new Sem.Walk_Library_Items (Action);
496 -- Start of processing for Check_Library_Items
500 end Check_Library_Items;
506 procedure Check_Rep_Info is
508 if List_Representation_Info /= 0
509 or else List_Representation_Info_Mechanisms
514 ("cannot generate representation information, no code generated");
521 -- Start of processing for Gnat1drv
524 -- This inner block is set up to catch assertion errors and constraint
525 -- errors. Since the code for handling these errors can cause another
526 -- exception to be raised (namely Unrecoverable_Error), we need two
527 -- nested blocks, so that the outer one handles unrecoverable error.
530 -- Initialize all packages. For the most part, these initialization
531 -- calls can be made in any order. Exceptions are as follows:
533 -- Lib.Initialize need to be called before Scan_Compiler_Arguments,
534 -- because it initializes a table filled by Scan_Compiler_Arguments.
540 Scan_Compiler_Arguments;
541 Osint.Add_Default_Search_Dirs;
561 Sem_Type.Init_Interp_Tables;
563 -- Acquire target parameters from system.ads (source of package System)
568 S : Source_File_Index;
572 Name_Buffer (1 .. 10) := "system.ads";
575 S := Load_Source_File (N);
577 if S = No_Source_File then
579 ("fatal error, run-time library not installed correctly");
581 ("cannot locate file system.ads");
582 raise Unrecoverable_Error;
584 -- Remember source index of system.ads (which was read successfully)
587 System_Source_File_Index := S;
590 Targparm.Get_Target_Parameters
591 (System_Text => Source_Text (S),
592 Source_First => Source_First (S),
593 Source_Last => Source_Last (S));
595 -- Acquire configuration pragma information from Targparm
597 Restrict.Restrictions := Targparm.Restrictions_On_Target;
600 Adjust_Global_Switches;
602 -- Output copyright notice if full list mode unless we have a list
603 -- file, in which case we defer this so that it is output in the file
605 if (Verbose_Mode or else (Full_List and then Full_List_File_Name = null))
606 and then not Debug_Flag_7
610 Write_Str (Gnat_Version_String);
612 Write_Str ("Copyright 1992-" &
614 ", Free Software Foundation, Inc.");
618 -- Check we do not have more than one source file, this happens only in
619 -- the case where the driver is called directly, it cannot happen when
620 -- gnat1 is invoked from gcc in the normal case.
622 if Osint.Number_Of_Files /= 1 then
625 Osint.Fail ("you must provide one source file");
627 elsif Usage_Requested then
631 Original_Operating_Mode := Operating_Mode;
634 -- Exit with errors if the main source could not be parsed
636 if Sinput.Main_Source_File = No_Source_File then
637 Errout.Finalize (Last_Call => True);
638 Errout.Output_Messages;
639 Exit_Program (E_Errors);
642 Main_Unit_Node := Cunit (Main_Unit);
643 Main_Kind := Nkind (Unit (Main_Unit_Node));
646 -- Exit if compilation errors detected
648 Errout.Finalize (Last_Call => False);
650 if Compilation_Errors then
652 Sem_Ch13.Validate_Unchecked_Conversions;
653 Sem_Ch13.Validate_Address_Clauses;
654 Errout.Output_Messages;
657 -- Generate ALI file if specially requested
659 if Opt.Force_ALI_Tree_File then
660 Write_ALI (Object => False);
664 Errout.Finalize (Last_Call => True);
665 Exit_Program (E_Errors);
668 -- Set Generate_Code on main unit and its spec. We do this even if are
669 -- not generating code, since Lib-Writ uses this to determine which
670 -- units get written in the ali file.
672 Set_Generate_Code (Main_Unit);
674 -- If we have a corresponding spec, and it comes from source
675 -- or it is not a generated spec for a child subprogram body,
676 -- then we need object code for the spec unit as well.
678 if Nkind (Unit (Main_Unit_Node)) in N_Unit_Body
679 and then not Acts_As_Spec (Main_Unit_Node)
681 if Nkind (Unit (Main_Unit_Node)) = N_Subprogram_Body
682 and then not Comes_From_Source (Library_Unit (Main_Unit_Node))
687 (Get_Cunit_Unit_Number (Library_Unit (Main_Unit_Node)));
691 -- Case of no code required to be generated, exit indicating no error
693 if Original_Operating_Mode = Check_Syntax then
695 Errout.Finalize (Last_Call => True);
696 Errout.Output_Messages;
701 -- Use a goto instead of calling Exit_Program so that finalization
706 elsif Original_Operating_Mode = Check_Semantics then
707 Back_End_Mode := Declarations_Only;
709 -- All remaining cases are cases in which the user requested that code
710 -- be generated (i.e. no -gnatc or -gnats switch was used). Check if
711 -- we can in fact satisfy this request.
713 -- Cannot generate code if someone has turned off code generation for
714 -- any reason at all. We will try to figure out a reason below.
716 elsif Operating_Mode /= Generate_Code then
717 Back_End_Mode := Skip;
719 -- We can generate code for a subprogram body unless there were missing
720 -- subunits. Note that we always generate code for all generic units (a
721 -- change from some previous versions of GNAT).
723 elsif Main_Kind = N_Subprogram_Body
724 and then not Subunits_Missing
726 Back_End_Mode := Generate_Object;
728 -- We can generate code for a package body unless there are subunits
729 -- missing (note that we always generate code for generic units, which
730 -- is a change from some earlier versions of GNAT).
732 elsif Main_Kind = N_Package_Body
733 and then not Subunits_Missing
735 Back_End_Mode := Generate_Object;
737 -- We can generate code for a package declaration or a subprogram
738 -- declaration only if it does not required a body.
740 elsif (Main_Kind = N_Package_Declaration
742 Main_Kind = N_Subprogram_Declaration)
744 (not Body_Required (Main_Unit_Node)
746 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
748 Back_End_Mode := Generate_Object;
750 -- We can generate code for a generic package declaration of a generic
751 -- subprogram declaration only if does not require a body.
753 elsif (Main_Kind = N_Generic_Package_Declaration
755 Main_Kind = N_Generic_Subprogram_Declaration)
756 and then not Body_Required (Main_Unit_Node)
758 Back_End_Mode := Generate_Object;
760 -- Compilation units that are renamings do not require bodies,
761 -- so we can generate code for them.
763 elsif Main_Kind = N_Package_Renaming_Declaration
764 or else Main_Kind = N_Subprogram_Renaming_Declaration
766 Back_End_Mode := Generate_Object;
768 -- Compilation units that are generic renamings do not require bodies
769 -- so we can generate code for them.
771 elsif Main_Kind in N_Generic_Renaming_Declaration then
772 Back_End_Mode := Generate_Object;
774 -- It's not an error to generate SCIL for e.g. a spec which has a body
776 elsif CodePeer_Mode then
777 Back_End_Mode := Generate_Object;
779 -- In all other cases (specs which have bodies, generics, and bodies
780 -- where subunits are missing), we cannot generate code and we generate
781 -- a warning message. Note that generic instantiations are gone at this
782 -- stage since they have been replaced by their instances.
785 Back_End_Mode := Skip;
788 -- At this stage Back_End_Mode is set to indicate if the backend should
789 -- be called to generate code. If it is Skip, then code generation has
790 -- been turned off, even though code was requested by the original
791 -- command. This is not an error from the user point of view, but it is
792 -- an error from the point of view of the gcc driver, so we must exit
793 -- with an error status.
795 -- We generate an informative message (from the gcc point of view, it
796 -- is an error message, but from the users point of view this is not an
797 -- error, just a consequence of compiling something that cannot
800 if Back_End_Mode = Skip then
802 Write_Str ("cannot generate code for ");
804 Write_Name (Unit_File_Name (Main_Unit));
806 if Subunits_Missing then
807 Write_Str (" (missing subunits)");
809 Write_Str ("to check parent unit");
811 elsif Main_Kind = N_Subunit then
812 Write_Str (" (subunit)");
814 Write_Str ("to check subunit");
816 elsif Main_Kind = N_Subprogram_Declaration then
817 Write_Str (" (subprogram spec)");
819 Write_Str ("to check subprogram spec");
821 -- Generic package body in GNAT implementation mode
823 elsif Main_Kind = N_Package_Body and then GNAT_Mode then
824 Write_Str (" (predefined generic)");
826 Write_Str ("to check predefined generic");
828 -- Only other case is a package spec
831 Write_Str (" (package spec)");
833 Write_Str ("to check package spec");
836 Write_Str (" for errors, use ");
838 if Hostparm.OpenVMS then
839 Write_Str ("/NOLOAD");
841 Write_Str ("-gnatc");
847 Sem_Ch13.Validate_Unchecked_Conversions;
848 Sem_Ch13.Validate_Address_Clauses;
849 Errout.Finalize (Last_Call => True);
850 Errout.Output_Messages;
853 Write_ALI (Object => False);
857 -- Exit program with error indication, to kill object file
859 Exit_Program (E_No_Code);
862 -- In -gnatc mode, we only do annotation if -gnatt or -gnatR is also
863 -- set as indicated by Back_Annotate_Rep_Info being set to True.
865 -- We don't call for annotations on a subunit, because to process those
866 -- the back-end requires that the parent(s) be properly compiled.
868 -- Annotation is suppressed for targets where front-end layout is
869 -- enabled, because the front end determines representations.
871 -- Annotation is also suppressed in the case of compiling for
872 -- a VM, since representations are largely symbolic there.
874 if Back_End_Mode = Declarations_Only
875 and then (not (Back_Annotate_Rep_Info or Generate_SCIL)
876 or else Main_Kind = N_Subunit
877 or else Targparm.Frontend_Layout_On_Target
878 or else Targparm.VM_Target /= No_VM)
880 Sem_Ch13.Validate_Unchecked_Conversions;
881 Sem_Ch13.Validate_Address_Clauses;
882 Errout.Finalize (Last_Call => True);
883 Errout.Output_Messages;
884 Write_ALI (Object => False);
892 -- Ensure that we properly register a dependency on system.ads, since
893 -- even if we do not semantically depend on this, Targparm has read
894 -- system parameters from the system.ads file.
896 Lib.Writ.Ensure_System_Dependency;
898 -- Add dependencies, if any, on preprocessing data file and on
899 -- preprocessing definition file(s).
901 Prepcomp.Add_Dependencies;
903 -- Back end needs to explicitly unlock tables it needs to touch
916 -- ???Check_Library_Items under control of a debug flag, because it
917 -- currently does not work if the -gnatn switch (back end inlining) is
920 if Debug_Flag_Dot_WW then
924 -- Here we call the back end to generate the output code
926 Generating_Code := True;
927 Back_End.Call_Back_End (Back_End_Mode);
929 -- Once the backend is complete, we unlock the names table. This call
930 -- allows a few extra entries, needed for example for the file name for
931 -- the library file output.
935 -- Validate unchecked conversions (using the values for size and
936 -- alignment annotated by the backend where possible).
938 Sem_Ch13.Validate_Unchecked_Conversions;
940 -- Validate address clauses (again using alignment values annotated
941 -- by the backend where possible).
943 Sem_Ch13.Validate_Address_Clauses;
945 -- Now we complete output of errors, rep info and the tree info. These
946 -- are delayed till now, since it is perfectly possible for gigi to
947 -- generate errors, modify the tree (in particular by setting flags
948 -- indicating that elaboration is required, and also to back annotate
949 -- representation information for List_Rep_Info.
951 Errout.Finalize (Last_Call => True);
952 Errout.Output_Messages;
955 -- Only write the library if the backend did not generate any error
956 -- messages. Otherwise signal errors to the driver program so that
957 -- there will be no attempt to generate an object file.
959 if Compilation_Errors then
961 Exit_Program (E_Errors);
964 Write_ALI (Object => (Back_End_Mode = Generate_Object));
966 -- Generate the ASIS tree after writing the ALI file, since in ASIS
967 -- mode, Write_ALI may in fact result in further tree decoration from
968 -- the original tree file. Note that we dump the tree just before
969 -- generating it, so that the dump will exactly reflect what is written
975 -- Finalize name table and we are all done
980 -- Handle fatal internal compiler errors
982 when Rtsfind.RE_Not_Available =>
983 Comperr.Compiler_Abort ("RE_Not_Available");
985 when System.Assertions.Assert_Failure =>
986 Comperr.Compiler_Abort ("Assert_Failure");
988 when Constraint_Error =>
989 Comperr.Compiler_Abort ("Constraint_Error");
991 when Program_Error =>
992 Comperr.Compiler_Abort ("Program_Error");
994 when Storage_Error =>
996 -- Assume this is a bug. If it is real, the message will in any case
997 -- say Storage_Error, giving a strong hint!
999 Comperr.Compiler_Abort ("Storage_Error");
1005 -- The outer exception handles an unrecoverable error
1008 when Unrecoverable_Error =>
1009 Errout.Finalize (Last_Call => True);
1010 Errout.Output_Messages;
1013 Write_Str ("compilation abandoned");
1016 Set_Standard_Output;
1019 Exit_Program (E_Errors);