1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2010, 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;
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;
51 with Repinfo; use Repinfo;
53 with Rident; use Rident;
63 with Sinfo; use Sinfo;
64 with Sinput.L; use Sinput.L;
66 with Sprint; use Sprint;
68 with Stylesw; use Stylesw;
69 with Targparm; use Targparm;
71 with Treepr; use Treepr;
73 with Types; use Types;
74 with Uintp; use Uintp;
75 with Uname; use Uname;
78 with Validsw; use Validsw;
80 with System.Assertions;
83 Main_Unit_Node : Node_Id;
84 -- Compilation unit node for main unit
86 Main_Kind : Node_Kind;
87 -- Kind of main compilation unit node
89 Back_End_Mode : Back_End.Back_End_Mode_Type;
90 -- Record back end mode
92 procedure Adjust_Global_Switches;
93 -- There are various interactions between front end switch settings,
94 -- including debug switch settings and target dependent parameters.
95 -- This procedure takes care of properly handling these interactions.
96 -- We do it after scanning out all the switches, so that we are not
97 -- depending on the order in which switches appear.
99 procedure Check_Bad_Body;
100 -- Called to check if the unit we are compiling has a bad body
102 procedure Check_Rep_Info;
103 -- Called when we are not generating code, to check if -gnatR was requested
104 -- and if so, explain that we will not be honoring the request.
106 procedure Check_Library_Items;
107 -- For debugging -- checks the behavior of Walk_Library_Items
108 pragma Warnings (Off, Check_Library_Items);
109 -- In case the call below is commented out
111 ----------------------------
112 -- Adjust_Global_Switches --
113 ----------------------------
115 procedure Adjust_Global_Switches is
117 -- Debug flag -gnatd.I is a synonym for Generate_SCIL and requires code
121 and then Operating_Mode = Generate_Code
123 Generate_SCIL := True;
126 -- Set ASIS mode if -gnatt and -gnatc are set
128 if Operating_Mode = Check_Semantics and then Tree_Output then
131 -- Turn off inlining in ASIS mode, since ASIS cannot handle the extra
132 -- information in the trees caused by inlining being active.
134 -- More specifically, the tree seems to be malformed from the ASIS
135 -- point of view if -gnatc and -gnatn appear together???
137 Inline_Active := False;
139 -- Turn off SCIL generation in ASIS mode, since SCIL requires front-
142 Generate_SCIL := False;
145 -- SCIL mode needs to disable front-end inlining since the generated
146 -- trees (in particular order and consistency between specs compiled
147 -- as part of a main unit or as part of a with-clause) are causing
150 if Generate_SCIL then
151 Front_End_Inlining := False;
154 -- Tune settings for optimal SCIL generation in CodePeer mode
156 if CodePeer_Mode then
158 -- Turn off inlining, confuses CodePeer output and gains nothing
160 Front_End_Inlining := False;
161 Inline_Active := False;
163 -- Turn off ASIS mode: incompatible with front-end expansion
167 -- Disable front-end optimizations, to keep the tree as close to the
168 -- source code as possible, and also to avoid inconsistencies between
169 -- trees when using different optimization switches.
171 Optimization_Level := 0;
173 -- Enable some restrictions systematically to simplify the generated
174 -- code (and ease analysis). Note that restriction checks are also
175 -- disabled in CodePeer mode, see Restrict.Check_Restriction
177 Restrict.Restrictions.Set (No_Task_Hierarchy) := True;
178 Restrict.Restrictions.Set (No_Abort_Statements) := True;
179 Restrict.Restrictions.Set (Max_Asynchronous_Select_Nesting) := True;
180 Restrict.Restrictions.Value (Max_Asynchronous_Select_Nesting) := 0;
182 -- Suppress overflow, division by zero and access checks since they
183 -- are handled implicitly by CodePeer.
185 -- Turn off dynamic elaboration checks: generates inconsistencies in
186 -- trees between specs compiled as part of a main unit or as part of
189 -- Turn off alignment checks: these cannot be proved statically by
190 -- CodePeer and generate false positives.
192 -- Enable all other language checks
195 (Access_Check => True,
196 Alignment_Check => True,
197 Division_Check => True,
198 Elaboration_Check => True,
199 Overflow_Check => True,
201 Enable_Overflow_Checks := False;
202 Dynamic_Elaboration_Checks := False;
204 -- Kill debug of generated code, since it messes up sloc values
206 Debug_Generated_Code := False;
208 -- Turn cross-referencing on in case it was disabled (e.g. by -gnatD)
209 -- Do we really need to spend time generating xref in CodePeer
210 -- mode??? Consider setting Xref_Active to False.
214 -- Polling mode forced off, since it generates confusing junk
216 Polling_Required := False;
218 -- Set operating mode to Generate_Code to benefit from full front-end
219 -- expansion (e.g. generics).
221 Operating_Mode := Generate_Code;
223 -- We need SCIL generation of course
225 Generate_SCIL := True;
227 -- Enable assertions and debug pragmas, since they give CodePeer
228 -- valuable extra information.
230 Assertions_Enabled := True;
231 Debug_Pragmas_Enabled := True;
233 -- Suppress compiler warnings, since what we are interested in here
234 -- is what CodePeer can find out. Also disable all simple value
235 -- propagation. This is an optimization which is valuable for code
236 -- optimization, and also for generation of compiler warnings, but
237 -- these are being turned off anyway, and CodePeer understands
238 -- things more clearly if references are not optimized in this way.
240 Warning_Mode := Suppress;
241 Debug_Flag_MM := True;
243 -- Set normal RM validity checking, and checking of IN OUT parameters
244 -- (this might give CodePeer more useful checks to analyze, to be
245 -- confirmed???). All other validity checking is turned off, since
246 -- this can generate very complex trees that only confuse CodePeer
247 -- and do not bring enough useful info.
249 Reset_Validity_Check_Options;
250 Validity_Check_Default := True;
251 Validity_Check_In_Out_Params := True;
252 Validity_Check_In_Params := True;
254 -- Turn off style check options since we are not interested in any
255 -- front-end warnings when we are getting CodePeer output.
257 Reset_Style_Check_Options;
259 -- Always perform semantics and generate ali files in CodePeer mode,
260 -- so that a gnatmake -c -k will proceed further when possible.
262 Force_ALI_Tree_File := True;
263 Try_Semantics := True;
266 -- Set Configurable_Run_Time mode if system.ads flag set
268 if Targparm.Configurable_Run_Time_On_Target or Debug_Flag_YY then
269 Configurable_Run_Time_Mode := True;
272 -- Set -gnatR3m mode if debug flag A set
274 if Debug_Flag_AA then
275 Back_Annotate_Rep_Info := True;
276 List_Representation_Info := 1;
277 List_Representation_Info_Mechanisms := True;
280 -- Force Target_Strict_Alignment true if debug flag -gnatd.a is set
282 if Debug_Flag_Dot_A then
283 Ttypes.Target_Strict_Alignment := True;
286 -- Disable static allocation of dispatch tables if -gnatd.t or if layout
287 -- is enabled. The front end's layout phase currently treats types that
288 -- have discriminant-dependent arrays as not being static even when a
289 -- discriminant constraint on the type is static, and this leads to
290 -- problems with subtypes of type Ada.Tags.Dispatch_Table_Wrapper. ???
292 if Debug_Flag_Dot_T or else Frontend_Layout_On_Target then
293 Static_Dispatch_Tables := False;
296 -- Flip endian mode if -gnatd8 set
299 Ttypes.Bytes_Big_Endian := not Ttypes.Bytes_Big_Endian;
302 -- Deal with forcing OpenVMS switches True if debug flag M is set, but
303 -- record the setting of Targparm.Open_VMS_On_Target in True_VMS_Target
304 -- before doing this, so we know if we are in real OpenVMS or not!
306 Opt.True_VMS_Target := Targparm.OpenVMS_On_Target;
309 Targparm.OpenVMS_On_Target := True;
310 Hostparm.OpenVMS := True;
313 -- Activate front end layout if debug flag -gnatdF is set
315 if Debug_Flag_FF then
316 Targparm.Frontend_Layout_On_Target := True;
319 -- Set and check exception mechnism
321 if Targparm.ZCX_By_Default_On_Target then
322 if Targparm.GCC_ZCX_Support_On_Target then
323 Exception_Mechanism := Back_End_Exceptions;
325 Osint.Fail ("Zero Cost Exceptions not supported on this target");
329 -- Set proper status for overflow checks. We turn on overflow checks if
330 -- -gnatp was not specified, and either -gnato is set or the back-end
331 -- takes care of overflow checks. Otherwise we suppress overflow checks
332 -- by default (since front end checks are expensive).
334 if not Opt.Suppress_Checks
335 and then (Opt.Enable_Overflow_Checks
337 (Targparm.Backend_Divide_Checks_On_Target
339 Targparm.Backend_Overflow_Checks_On_Target))
341 Suppress_Options (Overflow_Check) := False;
343 Suppress_Options (Overflow_Check) := True;
346 -- Set switch indicating if we can use N_Expression_With_Actions
348 -- Debug flag -gnatd.X decisively sets usage on
350 if Debug_Flag_Dot_XX then
351 Use_Expression_With_Actions := True;
353 -- Debug flag -gnatd.Y decisively sets usage off
355 elsif Debug_Flag_Dot_YY then
356 Use_Expression_With_Actions := False;
358 -- If no debug flags, usage off for SCIL
360 elsif Generate_SCIL then
361 Use_Expression_With_Actions := False;
363 -- Otherwise this feature is implemented, so we allow its use
366 Use_Expression_With_Actions := True;
369 -- Set switch indicating if back end can handle limited types, and
370 -- guarantee that no incorrect copies are made (e.g. in the context
371 -- of a conditional expression).
373 -- Debug flag -gnatd.L decisively sets usage on
375 if Debug_Flag_Dot_LL then
376 Back_End_Handles_Limited_Types := True;
378 -- If no debug flag, usage off for AAMP, VM, SCIL cases
381 or else VM_Target /= No_VM
382 or else Generate_SCIL
384 Back_End_Handles_Limited_Types := False;
386 -- Otherwise normal gcc back end, for now still turn flag off by
387 -- default, since there are unresolved problems in the front end.
390 Back_End_Handles_Limited_Types := False;
392 end Adjust_Global_Switches;
398 procedure Check_Bad_Body is
399 Sname : Unit_Name_Type;
400 Src_Ind : Source_File_Index;
401 Fname : File_Name_Type;
403 procedure Bad_Body_Error (Msg : String);
404 -- Issue message for bad body found
410 procedure Bad_Body_Error (Msg : String) is
412 Error_Msg_N (Msg, Main_Unit_Node);
413 Error_Msg_File_1 := Fname;
414 Error_Msg_N ("remove incorrect body in file{!", Main_Unit_Node);
417 -- Start of processing for Check_Bad_Body
420 -- Nothing to do if we are only checking syntax, because we don't know
421 -- enough to know if we require or forbid a body in this case.
423 if Operating_Mode = Check_Syntax then
427 -- Check for body not allowed
429 if (Main_Kind = N_Package_Declaration
430 and then not Body_Required (Main_Unit_Node))
431 or else (Main_Kind = N_Generic_Package_Declaration
432 and then not Body_Required (Main_Unit_Node))
433 or else Main_Kind = N_Package_Renaming_Declaration
434 or else Main_Kind = N_Subprogram_Renaming_Declaration
435 or else Nkind (Original_Node (Unit (Main_Unit_Node)))
436 in N_Generic_Instantiation
438 Sname := Unit_Name (Main_Unit);
440 -- If we do not already have a body name, then get the body name
441 -- (but how can we have a body name here???)
443 if not Is_Body_Name (Sname) then
444 Sname := Get_Body_Name (Sname);
447 Fname := Get_File_Name (Sname, Subunit => False);
448 Src_Ind := Load_Source_File (Fname);
450 -- Case where body is present and it is not a subunit. Exclude the
451 -- subunit case, because it has nothing to do with the package we are
452 -- compiling. It is illegal for a child unit and a subunit with the
453 -- same expanded name (RM 10.2(9)) to appear together in a partition,
454 -- but there is nothing to stop a compilation environment from having
455 -- both, and the test here simply allows that. If there is an attempt
456 -- to include both in a partition, this is diagnosed at bind time. In
457 -- Ada 83 mode this is not a warning case.
459 -- Note: if weird file names are being used, we can have a situation
460 -- where the file name that supposedly contains body in fact contains
461 -- a spec, or we can't tell what it contains. Skip the error message
464 -- Also ignore body that is nothing but pragma No_Body; (that's the
465 -- whole point of this pragma, to be used this way and to cause the
466 -- body file to be ignored in this context).
468 if Src_Ind /= No_Source_File
469 and then Get_Expected_Unit_Type (Fname) = Expect_Body
470 and then not Source_File_Is_Subunit (Src_Ind)
471 and then not Source_File_Is_No_Body (Src_Ind)
473 Errout.Finalize (Last_Call => False);
475 Error_Msg_Unit_1 := Sname;
477 -- Ada 83 case of a package body being ignored. This is not an
478 -- error as far as the Ada 83 RM is concerned, but it is almost
479 -- certainly not what is wanted so output a warning. Give this
480 -- message only if there were no errors, since otherwise it may
481 -- be incorrect (we may have misinterpreted a junk spec as not
482 -- needing a body when it really does).
484 if Main_Kind = N_Package_Declaration
485 and then Ada_Version = Ada_83
486 and then Operating_Mode = Generate_Code
487 and then Distribution_Stub_Mode /= Generate_Caller_Stub_Body
488 and then not Compilation_Errors
491 ("package $$ does not require a body?", Main_Unit_Node);
492 Error_Msg_File_1 := Fname;
493 Error_Msg_N ("body in file{? will be ignored", Main_Unit_Node);
495 -- Ada 95 cases of a body file present when no body is
496 -- permitted. This we consider to be an error.
499 -- For generic instantiations, we never allow a body
501 if Nkind (Original_Node (Unit (Main_Unit_Node)))
502 in N_Generic_Instantiation
505 ("generic instantiation for $$ does not allow a body");
507 -- A library unit that is a renaming never allows a body
509 elsif Main_Kind in N_Renaming_Declaration then
511 ("renaming declaration for $$ does not allow a body!");
513 -- Remaining cases are packages and generic packages. Here
514 -- we only do the test if there are no previous errors,
515 -- because if there are errors, they may lead us to
516 -- incorrectly believe that a package does not allow a body
517 -- when in fact it does.
519 elsif not Compilation_Errors then
520 if Main_Kind = N_Package_Declaration then
522 ("package $$ does not allow a body!");
524 elsif Main_Kind = N_Generic_Package_Declaration then
526 ("generic package $$ does not allow a body!");
535 -------------------------
536 -- Check_Library_Items --
537 -------------------------
539 -- Walk_Library_Items has plenty of assertions, so all we need to do is
540 -- call it, just for these assertions, not actually doing anything else.
542 procedure Check_Library_Items is
544 procedure Action (Item : Node_Id);
545 -- Action passed to Walk_Library_Items to do nothing
551 procedure Action (Item : Node_Id) is
556 procedure Walk is new Sem.Walk_Library_Items (Action);
558 -- Start of processing for Check_Library_Items
562 end Check_Library_Items;
568 procedure Check_Rep_Info is
570 if List_Representation_Info /= 0
571 or else List_Representation_Info_Mechanisms
576 ("cannot generate representation information, no code generated");
583 -- Start of processing for Gnat1drv
586 -- This inner block is set up to catch assertion errors and constraint
587 -- errors. Since the code for handling these errors can cause another
588 -- exception to be raised (namely Unrecoverable_Error), we need two
589 -- nested blocks, so that the outer one handles unrecoverable error.
592 -- Initialize all packages. For the most part, these initialization
593 -- calls can be made in any order. Exceptions are as follows:
595 -- Lib.Initialize need to be called before Scan_Compiler_Arguments,
596 -- because it initializes a table filled by Scan_Compiler_Arguments.
602 Scan_Compiler_Arguments;
603 Osint.Add_Default_Search_Dirs;
624 Sem_Type.Init_Interp_Tables;
626 -- Acquire target parameters from system.ads (source of package System)
631 S : Source_File_Index;
635 Name_Buffer (1 .. 10) := "system.ads";
638 S := Load_Source_File (N);
640 if S = No_Source_File then
642 ("fatal error, run-time library not installed correctly");
643 Write_Line ("cannot locate file system.ads");
644 raise Unrecoverable_Error;
646 -- Remember source index of system.ads (which was read successfully)
649 System_Source_File_Index := S;
652 Targparm.Get_Target_Parameters
653 (System_Text => Source_Text (S),
654 Source_First => Source_First (S),
655 Source_Last => Source_Last (S));
657 -- Acquire configuration pragma information from Targparm
659 Restrict.Restrictions := Targparm.Restrictions_On_Target;
662 Adjust_Global_Switches;
664 -- Output copyright notice if full list mode unless we have a list
665 -- file, in which case we defer this so that it is output in the file
667 if (Verbose_Mode or else (Full_List and then Full_List_File_Name = null))
668 and then not Debug_Flag_7
672 Write_Str (Gnat_Version_String);
674 Write_Str ("Copyright 1992-" & Current_Year
675 & ", Free Software Foundation, Inc.");
679 -- Check we do not have more than one source file, this happens only in
680 -- the case where the driver is called directly, it cannot happen when
681 -- gnat1 is invoked from gcc in the normal case.
683 if Osint.Number_Of_Files /= 1 then
686 Osint.Fail ("you must provide one source file");
688 elsif Usage_Requested then
692 Original_Operating_Mode := Operating_Mode;
695 -- Exit with errors if the main source could not be parsed
697 if Sinput.Main_Source_File = No_Source_File then
698 Errout.Finalize (Last_Call => True);
699 Errout.Output_Messages;
700 Exit_Program (E_Errors);
703 Main_Unit_Node := Cunit (Main_Unit);
704 Main_Kind := Nkind (Unit (Main_Unit_Node));
707 -- Exit if compilation errors detected
709 Errout.Finalize (Last_Call => False);
711 if Compilation_Errors then
713 Sem_Ch13.Validate_Unchecked_Conversions;
714 Sem_Ch13.Validate_Address_Clauses;
715 Errout.Output_Messages;
718 -- Generate ALI file if specially requested
720 if Opt.Force_ALI_Tree_File then
721 Write_ALI (Object => False);
725 Errout.Finalize (Last_Call => True);
726 Exit_Program (E_Errors);
729 -- Set Generate_Code on main unit and its spec. We do this even if are
730 -- not generating code, since Lib-Writ uses this to determine which
731 -- units get written in the ali file.
733 Set_Generate_Code (Main_Unit);
735 -- If we have a corresponding spec, and it comes from source or it is
736 -- not a generated spec for a child subprogram body, then we need object
737 -- code for the spec unit as well.
739 if Nkind (Unit (Main_Unit_Node)) in N_Unit_Body
740 and then not Acts_As_Spec (Main_Unit_Node)
742 if Nkind (Unit (Main_Unit_Node)) = N_Subprogram_Body
743 and then not Comes_From_Source (Library_Unit (Main_Unit_Node))
748 (Get_Cunit_Unit_Number (Library_Unit (Main_Unit_Node)));
752 -- Case of no code required to be generated, exit indicating no error
754 if Original_Operating_Mode = Check_Syntax then
756 Errout.Finalize (Last_Call => True);
757 Errout.Output_Messages;
762 -- Use a goto instead of calling Exit_Program so that finalization
767 elsif Original_Operating_Mode = Check_Semantics then
768 Back_End_Mode := Declarations_Only;
770 -- All remaining cases are cases in which the user requested that code
771 -- be generated (i.e. no -gnatc or -gnats switch was used). Check if we
772 -- can in fact satisfy this request.
774 -- Cannot generate code if someone has turned off code generation for
775 -- any reason at all. We will try to figure out a reason below.
777 elsif Operating_Mode /= Generate_Code then
778 Back_End_Mode := Skip;
780 -- We can generate code for a subprogram body unless there were missing
781 -- subunits. Note that we always generate code for all generic units (a
782 -- change from some previous versions of GNAT).
784 elsif Main_Kind = N_Subprogram_Body and then not Subunits_Missing then
785 Back_End_Mode := Generate_Object;
787 -- We can generate code for a package body unless there are subunits
788 -- missing (note that we always generate code for generic units, which
789 -- is a change from some earlier versions of GNAT).
791 elsif Main_Kind = N_Package_Body and then not Subunits_Missing then
792 Back_End_Mode := Generate_Object;
794 -- We can generate code for a package declaration or a subprogram
795 -- declaration only if it does not required a body.
797 elsif Nkind_In (Main_Kind,
798 N_Package_Declaration,
799 N_Subprogram_Declaration)
801 (not Body_Required (Main_Unit_Node)
803 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
805 Back_End_Mode := Generate_Object;
807 -- We can generate code for a generic package declaration of a generic
808 -- subprogram declaration only if does not require a body.
810 elsif Nkind_In (Main_Kind, N_Generic_Package_Declaration,
811 N_Generic_Subprogram_Declaration)
812 and then not Body_Required (Main_Unit_Node)
814 Back_End_Mode := Generate_Object;
816 -- Compilation units that are renamings do not require bodies, so we can
817 -- generate code for them.
819 elsif Nkind_In (Main_Kind, N_Package_Renaming_Declaration,
820 N_Subprogram_Renaming_Declaration)
822 Back_End_Mode := Generate_Object;
824 -- Compilation units that are generic renamings do not require bodies
825 -- so we can generate code for them.
827 elsif Main_Kind in N_Generic_Renaming_Declaration then
828 Back_End_Mode := Generate_Object;
830 -- It's not an error to generate SCIL for e.g. a spec which has a body
832 elsif CodePeer_Mode then
833 Back_End_Mode := Generate_Object;
835 -- In all other cases (specs which have bodies, generics, and bodies
836 -- where subunits are missing), we cannot generate code and we generate
837 -- a warning message. Note that generic instantiations are gone at this
838 -- stage since they have been replaced by their instances.
841 Back_End_Mode := Skip;
844 -- At this stage Back_End_Mode is set to indicate if the backend should
845 -- be called to generate code. If it is Skip, then code generation has
846 -- been turned off, even though code was requested by the original
847 -- command. This is not an error from the user point of view, but it is
848 -- an error from the point of view of the gcc driver, so we must exit
849 -- with an error status.
851 -- We generate an informative message (from the gcc point of view, it
852 -- is an error message, but from the users point of view this is not an
853 -- error, just a consequence of compiling something that cannot
856 if Back_End_Mode = Skip then
858 Write_Str ("cannot generate code for ");
860 Write_Name (Unit_File_Name (Main_Unit));
862 if Subunits_Missing then
863 Write_Str (" (missing subunits)");
866 elsif Main_Kind = N_Subunit then
867 Write_Str (" (subunit)");
870 elsif Main_Kind = N_Subprogram_Declaration then
871 Write_Str (" (subprogram spec)");
874 -- Generic package body in GNAT implementation mode
876 elsif Main_Kind = N_Package_Body and then GNAT_Mode then
877 Write_Str (" (predefined generic)");
880 -- Only other case is a package spec
883 Write_Str (" (package spec)");
889 Sem_Ch13.Validate_Unchecked_Conversions;
890 Sem_Ch13.Validate_Address_Clauses;
891 Errout.Finalize (Last_Call => True);
892 Errout.Output_Messages;
895 Write_ALI (Object => False);
899 -- Exit program with error indication, to kill object file
901 Exit_Program (E_No_Code);
904 -- In -gnatc mode, we only do annotation if -gnatt or -gnatR is also set
905 -- as indicated by Back_Annotate_Rep_Info being set to True.
907 -- We don't call for annotations on a subunit, because to process those
908 -- the back-end requires that the parent(s) be properly compiled.
910 -- Annotation is suppressed for targets where front-end layout is
911 -- enabled, because the front end determines representations.
913 -- Annotation is also suppressed in the case of compiling for a VM,
914 -- since representations are largely symbolic there.
916 if Back_End_Mode = Declarations_Only
917 and then (not (Back_Annotate_Rep_Info or Generate_SCIL)
918 or else Main_Kind = N_Subunit
919 or else Targparm.Frontend_Layout_On_Target
920 or else Targparm.VM_Target /= No_VM)
922 Sem_Ch13.Validate_Unchecked_Conversions;
923 Sem_Ch13.Validate_Address_Clauses;
924 Errout.Finalize (Last_Call => True);
925 Errout.Output_Messages;
926 Write_ALI (Object => False);
934 -- Ensure that we properly register a dependency on system.ads, since
935 -- even if we do not semantically depend on this, Targparm has read
936 -- system parameters from the system.ads file.
938 Lib.Writ.Ensure_System_Dependency;
940 -- Add dependencies, if any, on preprocessing data file and on
941 -- preprocessing definition file(s).
943 Prepcomp.Add_Dependencies;
945 -- Back end needs to explicitly unlock tables it needs to touch
958 -- ???Check_Library_Items under control of a debug flag, because it
959 -- currently does not work if the -gnatn switch (back end inlining) is
962 if Debug_Flag_Dot_WW then
966 -- Here we call the back end to generate the output code
968 Generating_Code := True;
969 Back_End.Call_Back_End (Back_End_Mode);
971 -- Once the backend is complete, we unlock the names table. This call
972 -- allows a few extra entries, needed for example for the file name for
973 -- the library file output.
977 -- Generate the call-graph output of dispatching calls
979 Exp_CG.Generate_CG_Output;
981 -- Validate unchecked conversions (using the values for size and
982 -- alignment annotated by the backend where possible).
984 Sem_Ch13.Validate_Unchecked_Conversions;
986 -- Validate address clauses (again using alignment values annotated
987 -- by the backend where possible).
989 Sem_Ch13.Validate_Address_Clauses;
991 -- Now we complete output of errors, rep info and the tree info. These
992 -- are delayed till now, since it is perfectly possible for gigi to
993 -- generate errors, modify the tree (in particular by setting flags
994 -- indicating that elaboration is required, and also to back annotate
995 -- representation information for List_Rep_Info.
997 Errout.Finalize (Last_Call => True);
998 Errout.Output_Messages;
1001 -- Only write the library if the backend did not generate any error
1002 -- messages. Otherwise signal errors to the driver program so that
1003 -- there will be no attempt to generate an object file.
1005 if Compilation_Errors then
1007 Exit_Program (E_Errors);
1010 Write_ALI (Object => (Back_End_Mode = Generate_Object));
1012 -- Generate ASIS tree after writing the ALI file, since in ASIS mode,
1013 -- Write_ALI may in fact result in further tree decoration from the
1014 -- original tree file. Note that we dump the tree just before generating
1015 -- it, so that the dump will exactly reflect what is written out.
1020 -- Finalize name table and we are all done
1025 -- Handle fatal internal compiler errors
1027 when Rtsfind.RE_Not_Available =>
1028 Comperr.Compiler_Abort ("RE_Not_Available");
1030 when System.Assertions.Assert_Failure =>
1031 Comperr.Compiler_Abort ("Assert_Failure");
1033 when Constraint_Error =>
1034 Comperr.Compiler_Abort ("Constraint_Error");
1036 when Program_Error =>
1037 Comperr.Compiler_Abort ("Program_Error");
1039 when Storage_Error =>
1041 -- Assume this is a bug. If it is real, the message will in any case
1042 -- say Storage_Error, giving a strong hint!
1044 Comperr.Compiler_Abort ("Storage_Error");
1050 -- The outer exception handles an unrecoverable error
1053 when Unrecoverable_Error =>
1054 Errout.Finalize (Last_Call => True);
1055 Errout.Output_Messages;
1058 Write_Str ("compilation abandoned");
1061 Set_Standard_Output;
1064 Exit_Program (E_Errors);