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 -- Disable all simple value propagation. This is an optimization
234 -- which is valuable for code optimization, and also for generation
235 -- of compiler warnings, but these are being turned off by default,
236 -- and CodePeer generates better messages (referencing original
237 -- variables) this way.
239 Debug_Flag_MM := True;
241 -- Set normal RM validity checking, and checking of IN OUT parameters
242 -- (this might give CodePeer more useful checks to analyze, to be
243 -- confirmed???). All other validity checking is turned off, since
244 -- this can generate very complex trees that only confuse CodePeer
245 -- and do not bring enough useful info.
247 Reset_Validity_Check_Options;
248 Validity_Check_Default := True;
249 Validity_Check_In_Out_Params := True;
250 Validity_Check_In_Params := True;
252 -- Turn off style check options since we are not interested in any
253 -- front-end warnings when we are getting CodePeer output.
255 Reset_Style_Check_Options;
257 -- Always perform semantics and generate ali files in CodePeer mode,
258 -- so that a gnatmake -c -k will proceed further when possible.
260 Force_ALI_Tree_File := True;
261 Try_Semantics := True;
264 -- Set Configurable_Run_Time mode if system.ads flag set
266 if Targparm.Configurable_Run_Time_On_Target or Debug_Flag_YY then
267 Configurable_Run_Time_Mode := True;
270 -- Set -gnatR3m mode if debug flag A set
272 if Debug_Flag_AA then
273 Back_Annotate_Rep_Info := True;
274 List_Representation_Info := 1;
275 List_Representation_Info_Mechanisms := True;
278 -- Force Target_Strict_Alignment true if debug flag -gnatd.a is set
280 if Debug_Flag_Dot_A then
281 Ttypes.Target_Strict_Alignment := True;
284 -- Disable static allocation of dispatch tables if -gnatd.t or if layout
285 -- is enabled. The front end's layout phase currently treats types that
286 -- have discriminant-dependent arrays as not being static even when a
287 -- discriminant constraint on the type is static, and this leads to
288 -- problems with subtypes of type Ada.Tags.Dispatch_Table_Wrapper. ???
290 if Debug_Flag_Dot_T or else Frontend_Layout_On_Target then
291 Static_Dispatch_Tables := False;
294 -- Flip endian mode if -gnatd8 set
297 Ttypes.Bytes_Big_Endian := not Ttypes.Bytes_Big_Endian;
300 -- Deal with forcing OpenVMS switches True if debug flag M is set, but
301 -- record the setting of Targparm.Open_VMS_On_Target in True_VMS_Target
302 -- before doing this, so we know if we are in real OpenVMS or not!
304 Opt.True_VMS_Target := Targparm.OpenVMS_On_Target;
307 Targparm.OpenVMS_On_Target := True;
308 Hostparm.OpenVMS := True;
311 -- Activate front end layout if debug flag -gnatdF is set
313 if Debug_Flag_FF then
314 Targparm.Frontend_Layout_On_Target := True;
317 -- Set and check exception mechnism
319 if Targparm.ZCX_By_Default_On_Target then
320 if Targparm.GCC_ZCX_Support_On_Target then
321 Exception_Mechanism := Back_End_Exceptions;
323 Osint.Fail ("Zero Cost Exceptions not supported on this target");
327 -- Set proper status for overflow checks. We turn on overflow checks if
328 -- -gnatp was not specified, and either -gnato is set or the back-end
329 -- takes care of overflow checks. Otherwise we suppress overflow checks
330 -- by default (since front end checks are expensive).
332 if not Opt.Suppress_Checks
333 and then (Opt.Enable_Overflow_Checks
335 (Targparm.Backend_Divide_Checks_On_Target
337 Targparm.Backend_Overflow_Checks_On_Target))
339 Suppress_Options (Overflow_Check) := False;
341 Suppress_Options (Overflow_Check) := True;
344 -- Set switch indicating if we can use N_Expression_With_Actions
346 -- Debug flag -gnatd.X decisively sets usage on
348 if Debug_Flag_Dot_XX then
349 Use_Expression_With_Actions := True;
351 -- Debug flag -gnatd.Y decisively sets usage off
353 elsif Debug_Flag_Dot_YY then
354 Use_Expression_With_Actions := False;
356 -- Otherwise this feature is implemented, so we allow its use
359 Use_Expression_With_Actions := True;
362 -- Set switch indicating if back end can handle limited types, and
363 -- guarantee that no incorrect copies are made (e.g. in the context
364 -- of a conditional expression).
366 -- Debug flag -gnatd.L decisively sets usage on
368 if Debug_Flag_Dot_LL then
369 Back_End_Handles_Limited_Types := True;
371 -- If no debug flag, usage off for AAMP, VM, SCIL cases
374 or else VM_Target /= No_VM
375 or else Generate_SCIL
377 Back_End_Handles_Limited_Types := False;
379 -- Otherwise normal gcc back end, for now still turn flag off by
380 -- default, since there are unresolved problems in the front end.
383 Back_End_Handles_Limited_Types := False;
385 end Adjust_Global_Switches;
391 procedure Check_Bad_Body is
392 Sname : Unit_Name_Type;
393 Src_Ind : Source_File_Index;
394 Fname : File_Name_Type;
396 procedure Bad_Body_Error (Msg : String);
397 -- Issue message for bad body found
403 procedure Bad_Body_Error (Msg : String) is
405 Error_Msg_N (Msg, Main_Unit_Node);
406 Error_Msg_File_1 := Fname;
407 Error_Msg_N ("remove incorrect body in file{!", Main_Unit_Node);
410 -- Start of processing for Check_Bad_Body
413 -- Nothing to do if we are only checking syntax, because we don't know
414 -- enough to know if we require or forbid a body in this case.
416 if Operating_Mode = Check_Syntax then
420 -- Check for body not allowed
422 if (Main_Kind = N_Package_Declaration
423 and then not Body_Required (Main_Unit_Node))
424 or else (Main_Kind = N_Generic_Package_Declaration
425 and then not Body_Required (Main_Unit_Node))
426 or else Main_Kind = N_Package_Renaming_Declaration
427 or else Main_Kind = N_Subprogram_Renaming_Declaration
428 or else Nkind (Original_Node (Unit (Main_Unit_Node)))
429 in N_Generic_Instantiation
431 Sname := Unit_Name (Main_Unit);
433 -- If we do not already have a body name, then get the body name
434 -- (but how can we have a body name here???)
436 if not Is_Body_Name (Sname) then
437 Sname := Get_Body_Name (Sname);
440 Fname := Get_File_Name (Sname, Subunit => False);
441 Src_Ind := Load_Source_File (Fname);
443 -- Case where body is present and it is not a subunit. Exclude the
444 -- subunit case, because it has nothing to do with the package we are
445 -- compiling. It is illegal for a child unit and a subunit with the
446 -- same expanded name (RM 10.2(9)) to appear together in a partition,
447 -- but there is nothing to stop a compilation environment from having
448 -- both, and the test here simply allows that. If there is an attempt
449 -- to include both in a partition, this is diagnosed at bind time. In
450 -- Ada 83 mode this is not a warning case.
452 -- Note: if weird file names are being used, we can have a situation
453 -- where the file name that supposedly contains body in fact contains
454 -- a spec, or we can't tell what it contains. Skip the error message
457 -- Also ignore body that is nothing but pragma No_Body; (that's the
458 -- whole point of this pragma, to be used this way and to cause the
459 -- body file to be ignored in this context).
461 if Src_Ind /= No_Source_File
462 and then Get_Expected_Unit_Type (Fname) = Expect_Body
463 and then not Source_File_Is_Subunit (Src_Ind)
464 and then not Source_File_Is_No_Body (Src_Ind)
466 Errout.Finalize (Last_Call => False);
468 Error_Msg_Unit_1 := Sname;
470 -- Ada 83 case of a package body being ignored. This is not an
471 -- error as far as the Ada 83 RM is concerned, but it is almost
472 -- certainly not what is wanted so output a warning. Give this
473 -- message only if there were no errors, since otherwise it may
474 -- be incorrect (we may have misinterpreted a junk spec as not
475 -- needing a body when it really does).
477 if Main_Kind = N_Package_Declaration
478 and then Ada_Version = Ada_83
479 and then Operating_Mode = Generate_Code
480 and then Distribution_Stub_Mode /= Generate_Caller_Stub_Body
481 and then not Compilation_Errors
484 ("package $$ does not require a body?", Main_Unit_Node);
485 Error_Msg_File_1 := Fname;
486 Error_Msg_N ("body in file{? will be ignored", Main_Unit_Node);
488 -- Ada 95 cases of a body file present when no body is
489 -- permitted. This we consider to be an error.
492 -- For generic instantiations, we never allow a body
494 if Nkind (Original_Node (Unit (Main_Unit_Node)))
495 in N_Generic_Instantiation
498 ("generic instantiation for $$ does not allow a body");
500 -- A library unit that is a renaming never allows a body
502 elsif Main_Kind in N_Renaming_Declaration then
504 ("renaming declaration for $$ does not allow a body!");
506 -- Remaining cases are packages and generic packages. Here
507 -- we only do the test if there are no previous errors,
508 -- because if there are errors, they may lead us to
509 -- incorrectly believe that a package does not allow a body
510 -- when in fact it does.
512 elsif not Compilation_Errors then
513 if Main_Kind = N_Package_Declaration then
515 ("package $$ does not allow a body!");
517 elsif Main_Kind = N_Generic_Package_Declaration then
519 ("generic package $$ does not allow a body!");
528 -------------------------
529 -- Check_Library_Items --
530 -------------------------
532 -- Walk_Library_Items has plenty of assertions, so all we need to do is
533 -- call it, just for these assertions, not actually doing anything else.
535 procedure Check_Library_Items is
537 procedure Action (Item : Node_Id);
538 -- Action passed to Walk_Library_Items to do nothing
544 procedure Action (Item : Node_Id) is
549 procedure Walk is new Sem.Walk_Library_Items (Action);
551 -- Start of processing for Check_Library_Items
555 end Check_Library_Items;
561 procedure Check_Rep_Info is
563 if List_Representation_Info /= 0
564 or else List_Representation_Info_Mechanisms
569 ("cannot generate representation information, no code generated");
576 -- Start of processing for Gnat1drv
579 -- This inner block is set up to catch assertion errors and constraint
580 -- errors. Since the code for handling these errors can cause another
581 -- exception to be raised (namely Unrecoverable_Error), we need two
582 -- nested blocks, so that the outer one handles unrecoverable error.
585 -- Initialize all packages. For the most part, these initialization
586 -- calls can be made in any order. Exceptions are as follows:
588 -- Lib.Initialize need to be called before Scan_Compiler_Arguments,
589 -- because it initializes a table filled by Scan_Compiler_Arguments.
595 Scan_Compiler_Arguments;
596 Osint.Add_Default_Search_Dirs;
616 Sem_Type.Init_Interp_Tables;
618 -- Acquire target parameters from system.ads (source of package System)
623 S : Source_File_Index;
627 Name_Buffer (1 .. 10) := "system.ads";
630 S := Load_Source_File (N);
632 if S = No_Source_File then
634 ("fatal error, run-time library not installed correctly");
635 Write_Line ("cannot locate file system.ads");
636 raise Unrecoverable_Error;
638 -- Remember source index of system.ads (which was read successfully)
641 System_Source_File_Index := S;
644 Targparm.Get_Target_Parameters
645 (System_Text => Source_Text (S),
646 Source_First => Source_First (S),
647 Source_Last => Source_Last (S));
649 -- Acquire configuration pragma information from Targparm
651 Restrict.Restrictions := Targparm.Restrictions_On_Target;
654 Adjust_Global_Switches;
656 -- Output copyright notice if full list mode unless we have a list
657 -- file, in which case we defer this so that it is output in the file
659 if (Verbose_Mode or else (Full_List and then Full_List_File_Name = null))
660 and then not Debug_Flag_7
664 Write_Str (Gnat_Version_String);
666 Write_Str ("Copyright 1992-" & Current_Year
667 & ", Free Software Foundation, Inc.");
671 -- Check we do not have more than one source file, this happens only in
672 -- the case where the driver is called directly, it cannot happen when
673 -- gnat1 is invoked from gcc in the normal case.
675 if Osint.Number_Of_Files /= 1 then
678 Osint.Fail ("you must provide one source file");
680 elsif Usage_Requested then
684 Original_Operating_Mode := Operating_Mode;
687 -- Exit with errors if the main source could not be parsed
689 if Sinput.Main_Source_File = No_Source_File then
690 Errout.Finalize (Last_Call => True);
691 Errout.Output_Messages;
692 Exit_Program (E_Errors);
695 Main_Unit_Node := Cunit (Main_Unit);
696 Main_Kind := Nkind (Unit (Main_Unit_Node));
699 -- Exit if compilation errors detected
701 Errout.Finalize (Last_Call => False);
703 if Compilation_Errors then
705 Sem_Ch13.Validate_Unchecked_Conversions;
706 Sem_Ch13.Validate_Address_Clauses;
707 Errout.Output_Messages;
710 -- Generate ALI file if specially requested
712 if Opt.Force_ALI_Tree_File then
713 Write_ALI (Object => False);
717 Errout.Finalize (Last_Call => True);
718 Exit_Program (E_Errors);
721 -- Set Generate_Code on main unit and its spec. We do this even if are
722 -- not generating code, since Lib-Writ uses this to determine which
723 -- units get written in the ali file.
725 Set_Generate_Code (Main_Unit);
727 -- If we have a corresponding spec, and it comes from source or it is
728 -- not a generated spec for a child subprogram body, then we need object
729 -- code for the spec unit as well.
731 if Nkind (Unit (Main_Unit_Node)) in N_Unit_Body
732 and then not Acts_As_Spec (Main_Unit_Node)
734 if Nkind (Unit (Main_Unit_Node)) = N_Subprogram_Body
735 and then not Comes_From_Source (Library_Unit (Main_Unit_Node))
740 (Get_Cunit_Unit_Number (Library_Unit (Main_Unit_Node)));
744 -- Case of no code required to be generated, exit indicating no error
746 if Original_Operating_Mode = Check_Syntax then
748 Errout.Finalize (Last_Call => True);
749 Errout.Output_Messages;
754 -- Use a goto instead of calling Exit_Program so that finalization
759 elsif Original_Operating_Mode = Check_Semantics then
760 Back_End_Mode := Declarations_Only;
762 -- All remaining cases are cases in which the user requested that code
763 -- be generated (i.e. no -gnatc or -gnats switch was used). Check if we
764 -- can in fact satisfy this request.
766 -- Cannot generate code if someone has turned off code generation for
767 -- any reason at all. We will try to figure out a reason below.
769 elsif Operating_Mode /= Generate_Code then
770 Back_End_Mode := Skip;
772 -- We can generate code for a subprogram body unless there were missing
773 -- subunits. Note that we always generate code for all generic units (a
774 -- change from some previous versions of GNAT).
776 elsif Main_Kind = N_Subprogram_Body and then not Subunits_Missing then
777 Back_End_Mode := Generate_Object;
779 -- We can generate code for a package body unless there are subunits
780 -- missing (note that we always generate code for generic units, which
781 -- is a change from some earlier versions of GNAT).
783 elsif Main_Kind = N_Package_Body and then not Subunits_Missing then
784 Back_End_Mode := Generate_Object;
786 -- We can generate code for a package declaration or a subprogram
787 -- declaration only if it does not required a body.
789 elsif Nkind_In (Main_Kind,
790 N_Package_Declaration,
791 N_Subprogram_Declaration)
793 (not Body_Required (Main_Unit_Node)
795 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
797 Back_End_Mode := Generate_Object;
799 -- We can generate code for a generic package declaration of a generic
800 -- subprogram declaration only if does not require a body.
802 elsif Nkind_In (Main_Kind, N_Generic_Package_Declaration,
803 N_Generic_Subprogram_Declaration)
804 and then not Body_Required (Main_Unit_Node)
806 Back_End_Mode := Generate_Object;
808 -- Compilation units that are renamings do not require bodies, so we can
809 -- generate code for them.
811 elsif Nkind_In (Main_Kind, N_Package_Renaming_Declaration,
812 N_Subprogram_Renaming_Declaration)
814 Back_End_Mode := Generate_Object;
816 -- Compilation units that are generic renamings do not require bodies
817 -- so we can generate code for them.
819 elsif Main_Kind in N_Generic_Renaming_Declaration then
820 Back_End_Mode := Generate_Object;
822 -- It's not an error to generate SCIL for e.g. a spec which has a body
824 elsif CodePeer_Mode then
825 Back_End_Mode := Generate_Object;
827 -- In all other cases (specs which have bodies, generics, and bodies
828 -- where subunits are missing), we cannot generate code and we generate
829 -- a warning message. Note that generic instantiations are gone at this
830 -- stage since they have been replaced by their instances.
833 Back_End_Mode := Skip;
836 -- At this stage Back_End_Mode is set to indicate if the backend should
837 -- be called to generate code. If it is Skip, then code generation has
838 -- been turned off, even though code was requested by the original
839 -- command. This is not an error from the user point of view, but it is
840 -- an error from the point of view of the gcc driver, so we must exit
841 -- with an error status.
843 -- We generate an informative message (from the gcc point of view, it
844 -- is an error message, but from the users point of view this is not an
845 -- error, just a consequence of compiling something that cannot
848 if Back_End_Mode = Skip then
850 Write_Str ("cannot generate code for ");
852 Write_Name (Unit_File_Name (Main_Unit));
854 if Subunits_Missing then
855 Write_Str (" (missing subunits)");
858 elsif Main_Kind = N_Subunit then
859 Write_Str (" (subunit)");
862 elsif Main_Kind = N_Subprogram_Declaration then
863 Write_Str (" (subprogram spec)");
866 -- Generic package body in GNAT implementation mode
868 elsif Main_Kind = N_Package_Body and then GNAT_Mode then
869 Write_Str (" (predefined generic)");
872 -- Only other case is a package spec
875 Write_Str (" (package spec)");
881 Sem_Ch13.Validate_Unchecked_Conversions;
882 Sem_Ch13.Validate_Address_Clauses;
883 Errout.Finalize (Last_Call => True);
884 Errout.Output_Messages;
887 Write_ALI (Object => False);
891 -- Exit program with error indication, to kill object file
893 Exit_Program (E_No_Code);
896 -- In -gnatc mode, we only do annotation if -gnatt or -gnatR is also set
897 -- as indicated by Back_Annotate_Rep_Info being set to True.
899 -- We don't call for annotations on a subunit, because to process those
900 -- the back-end requires that the parent(s) be properly compiled.
902 -- Annotation is suppressed for targets where front-end layout is
903 -- enabled, because the front end determines representations.
905 -- Annotation is also suppressed in the case of compiling for a VM,
906 -- since representations are largely symbolic there.
908 if Back_End_Mode = Declarations_Only
909 and then (not (Back_Annotate_Rep_Info or Generate_SCIL)
910 or else Main_Kind = N_Subunit
911 or else Targparm.Frontend_Layout_On_Target
912 or else Targparm.VM_Target /= No_VM)
914 Sem_Ch13.Validate_Unchecked_Conversions;
915 Sem_Ch13.Validate_Address_Clauses;
916 Errout.Finalize (Last_Call => True);
917 Errout.Output_Messages;
918 Write_ALI (Object => False);
926 -- Ensure that we properly register a dependency on system.ads, since
927 -- even if we do not semantically depend on this, Targparm has read
928 -- system parameters from the system.ads file.
930 Lib.Writ.Ensure_System_Dependency;
932 -- Add dependencies, if any, on preprocessing data file and on
933 -- preprocessing definition file(s).
935 Prepcomp.Add_Dependencies;
937 -- Back end needs to explicitly unlock tables it needs to touch
950 -- ???Check_Library_Items under control of a debug flag, because it
951 -- currently does not work if the -gnatn switch (back end inlining) is
954 if Debug_Flag_Dot_WW then
958 -- Here we call the back end to generate the output code
960 Generating_Code := True;
961 Back_End.Call_Back_End (Back_End_Mode);
963 -- Once the backend is complete, we unlock the names table. This call
964 -- allows a few extra entries, needed for example for the file name for
965 -- the library file output.
969 -- Generate the call-graph output of dispatching calls
971 Exp_CG.Generate_CG_Output;
973 -- Validate unchecked conversions (using the values for size and
974 -- alignment annotated by the backend where possible).
976 Sem_Ch13.Validate_Unchecked_Conversions;
978 -- Validate address clauses (again using alignment values annotated
979 -- by the backend where possible).
981 Sem_Ch13.Validate_Address_Clauses;
983 -- Now we complete output of errors, rep info and the tree info. These
984 -- are delayed till now, since it is perfectly possible for gigi to
985 -- generate errors, modify the tree (in particular by setting flags
986 -- indicating that elaboration is required, and also to back annotate
987 -- representation information for List_Rep_Info.
989 Errout.Finalize (Last_Call => True);
990 Errout.Output_Messages;
993 -- Only write the library if the backend did not generate any error
994 -- messages. Otherwise signal errors to the driver program so that
995 -- there will be no attempt to generate an object file.
997 if Compilation_Errors then
999 Exit_Program (E_Errors);
1002 Write_ALI (Object => (Back_End_Mode = Generate_Object));
1004 -- Generate ASIS tree after writing the ALI file, since in ASIS mode,
1005 -- Write_ALI may in fact result in further tree decoration from the
1006 -- original tree file. Note that we dump the tree just before generating
1007 -- it, so that the dump will exactly reflect what is written out.
1012 -- Finalize name table and we are all done
1017 -- Handle fatal internal compiler errors
1019 when Rtsfind.RE_Not_Available =>
1020 Comperr.Compiler_Abort ("RE_Not_Available");
1022 when System.Assertions.Assert_Failure =>
1023 Comperr.Compiler_Abort ("Assert_Failure");
1025 when Constraint_Error =>
1026 Comperr.Compiler_Abort ("Constraint_Error");
1028 when Program_Error =>
1029 Comperr.Compiler_Abort ("Program_Error");
1031 when Storage_Error =>
1033 -- Assume this is a bug. If it is real, the message will in any case
1034 -- say Storage_Error, giving a strong hint!
1036 Comperr.Compiler_Abort ("Storage_Error");
1042 -- The outer exception handles an unrecoverable error
1045 when Unrecoverable_Error =>
1046 Errout.Finalize (Last_Call => True);
1047 Errout.Output_Messages;
1050 Write_Str ("compilation abandoned");
1053 Set_Standard_Output;
1056 Exit_Program (E_Errors);