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 -- Suppress overflow, division by zero and access checks since they
166 -- are handled implicitly by CodePeer.
168 -- Turn off dynamic elaboration checks: generates inconsistencies in
169 -- trees between specs compiled as part of a main unit or as part of
172 -- Turn off alignment checks: these cannot be proved statically by
173 -- CodePeer and generate false positives.
175 -- Enable all other language checks
178 (Access_Check
=> True,
179 Alignment_Check
=> True,
180 Division_Check
=> True,
181 Elaboration_Check
=> True,
182 Overflow_Check
=> True,
184 Enable_Overflow_Checks
:= False;
185 Dynamic_Elaboration_Checks
:= False;
187 -- Kill debug of generated code, since it messes up sloc values
189 Debug_Generated_Code
:= False;
191 -- Turn cross-referencing on in case it was disabled (by e.g. -gnatD)
192 -- Do we really need to spend time generating xref in CodePeer
193 -- mode??? Consider setting Xref_Active to False.
197 -- Polling mode forced off, since it generates confusing junk
199 Polling_Required
:= False;
201 -- Set operating mode to Generate_Code to benefit from full
202 -- front-end expansion (e.g. generics).
204 Operating_Mode
:= Generate_Code
;
206 -- We need SCIL generation of course
208 Generate_SCIL
:= True;
210 -- Enable assertions and debug pragmas, since they give CodePeer
211 -- valuable extra information.
213 Assertions_Enabled
:= True;
214 Debug_Pragmas_Enabled
:= True;
216 -- Suppress compiler warnings, since what we are interested in here
217 -- is what CodePeer can find out. Also disable all simple value
218 -- propagation. This is an optimization which is valuable for code
219 -- optimization, and also for generation of compiler warnings, but
220 -- these are being turned off anyway, and CodePeer understands
221 -- things more clearly if references are not optimized in this way.
223 Warning_Mode
:= Suppress
;
224 Debug_Flag_MM
:= True;
226 -- Set normal RM validity checking, and checking of IN OUT parameters
227 -- (this might give CodePeer more useful checks to analyze, to be
228 -- confirmed???). All other validity checking is turned off, since
229 -- this can generate very complex trees that only confuse CodePeer
230 -- and do not bring enough useful info.
232 Reset_Validity_Check_Options
;
233 Validity_Check_Default
:= True;
234 Validity_Check_In_Out_Params
:= True;
235 Validity_Check_In_Params
:= True;
237 -- Turn off style check options since we are not interested in any
238 -- front-end warnings when we are getting CodePeer output.
240 Reset_Style_Check_Options
;
243 -- Set Configurable_Run_Time mode if system.ads flag set
245 if Targparm
.Configurable_Run_Time_On_Target
or Debug_Flag_YY
then
246 Configurable_Run_Time_Mode
:= True;
249 -- Set -gnatR3m mode if debug flag A set
251 if Debug_Flag_AA
then
252 Back_Annotate_Rep_Info
:= True;
253 List_Representation_Info
:= 1;
254 List_Representation_Info_Mechanisms
:= True;
257 -- Force Target_Strict_Alignment true if debug flag -gnatd.a is set
259 if Debug_Flag_Dot_A
then
260 Ttypes
.Target_Strict_Alignment
:= True;
263 -- Disable static allocation of dispatch tables if -gnatd.t or if layout
264 -- is enabled. The front end's layout phase currently treats types that
265 -- have discriminant-dependent arrays as not being static even when a
266 -- discriminant constraint on the type is static, and this leads to
267 -- problems with subtypes of type Ada.Tags.Dispatch_Table_Wrapper. ???
269 if Debug_Flag_Dot_T
or else Frontend_Layout_On_Target
then
270 Static_Dispatch_Tables
:= False;
273 -- Flip endian mode if -gnatd8 set
276 Ttypes
.Bytes_Big_Endian
:= not Ttypes
.Bytes_Big_Endian
;
279 -- Deal with forcing OpenVMS switches True if debug flag M is set, but
280 -- record the setting of Targparm.Open_VMS_On_Target in True_VMS_Target
281 -- before doing this, so we know if we are in real OpenVMS or not!
283 Opt
.True_VMS_Target
:= Targparm
.OpenVMS_On_Target
;
286 Targparm
.OpenVMS_On_Target
:= True;
287 Hostparm
.OpenVMS
:= True;
290 -- Activate front end layout if debug flag -gnatdF is set
292 if Debug_Flag_FF
then
293 Targparm
.Frontend_Layout_On_Target
:= True;
296 -- Set and check exception mechnism
298 if Targparm
.ZCX_By_Default_On_Target
then
299 if Targparm
.GCC_ZCX_Support_On_Target
then
300 Exception_Mechanism
:= Back_End_Exceptions
;
302 Osint
.Fail
("Zero Cost Exceptions not supported on this target");
306 -- Set proper status for overflow checks. We turn on overflow checks
307 -- if -gnatp was not specified, and either -gnato is set or the back
308 -- end takes care of overflow checks. Otherwise we suppress overflow
309 -- checks by default (since front end checks are expensive).
311 if not Opt
.Suppress_Checks
312 and then (Opt
.Enable_Overflow_Checks
314 (Targparm
.Backend_Divide_Checks_On_Target
316 Targparm
.Backend_Overflow_Checks_On_Target
))
318 Suppress_Options
(Overflow_Check
) := False;
320 Suppress_Options
(Overflow_Check
) := True;
322 end Adjust_Global_Switches
;
328 procedure Check_Bad_Body
is
329 Sname
: Unit_Name_Type
;
330 Src_Ind
: Source_File_Index
;
331 Fname
: File_Name_Type
;
333 procedure Bad_Body_Error
(Msg
: String);
334 -- Issue message for bad body found
340 procedure Bad_Body_Error
(Msg
: String) is
342 Error_Msg_N
(Msg
, Main_Unit_Node
);
343 Error_Msg_File_1
:= Fname
;
344 Error_Msg_N
("remove incorrect body in file{!", Main_Unit_Node
);
347 -- Start of processing for Check_Bad_Body
350 -- Nothing to do if we are only checking syntax, because we don't know
351 -- enough to know if we require or forbid a body in this case.
353 if Operating_Mode
= Check_Syntax
then
357 -- Check for body not allowed
359 if (Main_Kind
= N_Package_Declaration
360 and then not Body_Required
(Main_Unit_Node
))
361 or else (Main_Kind
= N_Generic_Package_Declaration
362 and then not Body_Required
(Main_Unit_Node
))
363 or else Main_Kind
= N_Package_Renaming_Declaration
364 or else Main_Kind
= N_Subprogram_Renaming_Declaration
365 or else Nkind
(Original_Node
(Unit
(Main_Unit_Node
)))
366 in N_Generic_Instantiation
368 Sname
:= Unit_Name
(Main_Unit
);
370 -- If we do not already have a body name, then get the body name
371 -- (but how can we have a body name here ???)
373 if not Is_Body_Name
(Sname
) then
374 Sname
:= Get_Body_Name
(Sname
);
377 Fname
:= Get_File_Name
(Sname
, Subunit
=> False);
378 Src_Ind
:= Load_Source_File
(Fname
);
380 -- Case where body is present and it is not a subunit. Exclude
381 -- the subunit case, because it has nothing to do with the
382 -- package we are compiling. It is illegal for a child unit and a
383 -- subunit with the same expanded name (RM 10.2(9)) to appear
384 -- together in a partition, but there is nothing to stop a
385 -- compilation environment from having both, and the test here
386 -- simply allows that. If there is an attempt to include both in
387 -- a partition, this is diagnosed at bind time. In Ada 83 mode
388 -- this is not a warning case.
390 -- Note: if weird file names are being used, we can have
391 -- situation where the file name that supposedly contains body,
392 -- in fact contains a spec, or we can't tell what it contains.
393 -- Skip the error message in these cases.
395 -- Also ignore body that is nothing but pragma No_Body; (that's the
396 -- whole point of this pragma, to be used this way and to cause the
397 -- body file to be ignored in this context).
399 if Src_Ind
/= No_Source_File
400 and then Get_Expected_Unit_Type
(Fname
) = Expect_Body
401 and then not Source_File_Is_Subunit
(Src_Ind
)
402 and then not Source_File_Is_No_Body
(Src_Ind
)
404 Errout
.Finalize
(Last_Call
=> False);
406 Error_Msg_Unit_1
:= Sname
;
408 -- Ada 83 case of a package body being ignored. This is not an
409 -- error as far as the Ada 83 RM is concerned, but it is almost
410 -- certainly not what is wanted so output a warning. Give this
411 -- message only if there were no errors, since otherwise it may
412 -- be incorrect (we may have misinterpreted a junk spec as not
413 -- needing a body when it really does).
415 if Main_Kind
= N_Package_Declaration
416 and then Ada_Version
= Ada_83
417 and then Operating_Mode
= Generate_Code
418 and then Distribution_Stub_Mode
/= Generate_Caller_Stub_Body
419 and then not Compilation_Errors
422 ("package $$ does not require a body?", Main_Unit_Node
);
423 Error_Msg_File_1
:= Fname
;
424 Error_Msg_N
("body in file{? will be ignored", Main_Unit_Node
);
426 -- Ada 95 cases of a body file present when no body is
427 -- permitted. This we consider to be an error.
430 -- For generic instantiations, we never allow a body
432 if Nkind
(Original_Node
(Unit
(Main_Unit_Node
)))
433 in N_Generic_Instantiation
436 ("generic instantiation for $$ does not allow a body");
438 -- A library unit that is a renaming never allows a body
440 elsif Main_Kind
in N_Renaming_Declaration
then
442 ("renaming declaration for $$ does not allow a body!");
444 -- Remaining cases are packages and generic packages. Here
445 -- we only do the test if there are no previous errors,
446 -- because if there are errors, they may lead us to
447 -- incorrectly believe that a package does not allow a body
448 -- when in fact it does.
450 elsif not Compilation_Errors
then
451 if Main_Kind
= N_Package_Declaration
then
453 ("package $$ does not allow a body!");
455 elsif Main_Kind
= N_Generic_Package_Declaration
then
457 ("generic package $$ does not allow a body!");
466 -------------------------
467 -- Check_Library_Items --
468 -------------------------
470 -- Walk_Library_Items has plenty of assertions, so all we need to do is
471 -- call it, just for these assertions, not actually doing anything else.
473 procedure Check_Library_Items
is
475 procedure Action
(Item
: Node_Id
);
476 -- Action passed to Walk_Library_Items to do nothing
482 procedure Action
(Item
: Node_Id
) is
487 procedure Walk
is new Sem
.Walk_Library_Items
(Action
);
489 -- Start of processing for Check_Library_Items
493 end Check_Library_Items
;
499 procedure Check_Rep_Info
is
501 if List_Representation_Info
/= 0
502 or else List_Representation_Info_Mechanisms
507 ("cannot generate representation information, no code generated");
514 -- Start of processing for Gnat1drv
517 -- This inner block is set up to catch assertion errors and constraint
518 -- errors. Since the code for handling these errors can cause another
519 -- exception to be raised (namely Unrecoverable_Error), we need two
520 -- nested blocks, so that the outer one handles unrecoverable error.
523 -- Initialize all packages. For the most part, these initialization
524 -- calls can be made in any order. Exceptions are as follows:
526 -- Lib.Initialize need to be called before Scan_Compiler_Arguments,
527 -- because it initializes a table filled by Scan_Compiler_Arguments.
533 Scan_Compiler_Arguments
;
534 Osint
.Add_Default_Search_Dirs
;
554 Sem_Type
.Init_Interp_Tables
;
556 -- Acquire target parameters from system.ads (source of package System)
561 S
: Source_File_Index
;
565 Name_Buffer
(1 .. 10) := "system.ads";
568 S
:= Load_Source_File
(N
);
570 if S
= No_Source_File
then
572 ("fatal error, run-time library not installed correctly");
574 ("cannot locate file system.ads");
575 raise Unrecoverable_Error
;
577 -- Remember source index of system.ads (which was read successfully)
580 System_Source_File_Index
:= S
;
583 Targparm
.Get_Target_Parameters
584 (System_Text
=> Source_Text
(S
),
585 Source_First
=> Source_First
(S
),
586 Source_Last
=> Source_Last
(S
));
588 -- Acquire configuration pragma information from Targparm
590 Restrict
.Restrictions
:= Targparm
.Restrictions_On_Target
;
593 Adjust_Global_Switches
;
595 -- Output copyright notice if full list mode unless we have a list
596 -- file, in which case we defer this so that it is output in the file
598 if (Verbose_Mode
or else (Full_List
and then Full_List_File_Name
= null))
599 and then not Debug_Flag_7
603 Write_Str
(Gnat_Version_String
);
605 Write_Str
("Copyright 1992-" &
607 ", Free Software Foundation, Inc.");
611 -- Check we do not have more than one source file, this happens only in
612 -- the case where the driver is called directly, it cannot happen when
613 -- gnat1 is invoked from gcc in the normal case.
615 if Osint
.Number_Of_Files
/= 1 then
618 Osint
.Fail
("you must provide one source file");
620 elsif Usage_Requested
then
624 Original_Operating_Mode
:= Operating_Mode
;
627 -- Exit with errors if the main source could not be parsed
629 if Sinput
.Main_Source_File
= No_Source_File
then
630 Errout
.Finalize
(Last_Call
=> True);
631 Errout
.Output_Messages
;
632 Exit_Program
(E_Errors
);
635 Main_Unit_Node
:= Cunit
(Main_Unit
);
636 Main_Kind
:= Nkind
(Unit
(Main_Unit_Node
));
639 -- Exit if compilation errors detected
641 Errout
.Finalize
(Last_Call
=> False);
643 if Compilation_Errors
then
645 Sem_Ch13
.Validate_Unchecked_Conversions
;
646 Sem_Ch13
.Validate_Address_Clauses
;
647 Errout
.Output_Messages
;
650 -- Generate ALI file if specially requested
652 if Opt
.Force_ALI_Tree_File
then
653 Write_ALI
(Object
=> False);
657 Errout
.Finalize
(Last_Call
=> True);
658 Exit_Program
(E_Errors
);
661 -- Set Generate_Code on main unit and its spec. We do this even if are
662 -- not generating code, since Lib-Writ uses this to determine which
663 -- units get written in the ali file.
665 Set_Generate_Code
(Main_Unit
);
667 -- If we have a corresponding spec, and it comes from source
668 -- or it is not a generated spec for a child subprogram body,
669 -- then we need object code for the spec unit as well.
671 if Nkind
(Unit
(Main_Unit_Node
)) in N_Unit_Body
672 and then not Acts_As_Spec
(Main_Unit_Node
)
674 if Nkind
(Unit
(Main_Unit_Node
)) = N_Subprogram_Body
675 and then not Comes_From_Source
(Library_Unit
(Main_Unit_Node
))
680 (Get_Cunit_Unit_Number
(Library_Unit
(Main_Unit_Node
)));
684 -- Case of no code required to be generated, exit indicating no error
686 if Original_Operating_Mode
= Check_Syntax
then
688 Errout
.Finalize
(Last_Call
=> True);
689 Errout
.Output_Messages
;
694 -- Use a goto instead of calling Exit_Program so that finalization
699 elsif Original_Operating_Mode
= Check_Semantics
then
700 Back_End_Mode
:= Declarations_Only
;
702 -- All remaining cases are cases in which the user requested that code
703 -- be generated (i.e. no -gnatc or -gnats switch was used). Check if
704 -- we can in fact satisfy this request.
706 -- Cannot generate code if someone has turned off code generation for
707 -- any reason at all. We will try to figure out a reason below.
709 elsif Operating_Mode
/= Generate_Code
then
710 Back_End_Mode
:= Skip
;
712 -- We can generate code for a subprogram body unless there were missing
713 -- subunits. Note that we always generate code for all generic units (a
714 -- change from some previous versions of GNAT).
716 elsif Main_Kind
= N_Subprogram_Body
717 and then not Subunits_Missing
719 Back_End_Mode
:= Generate_Object
;
721 -- We can generate code for a package body unless there are subunits
722 -- missing (note that we always generate code for generic units, which
723 -- is a change from some earlier versions of GNAT).
725 elsif Main_Kind
= N_Package_Body
726 and then not Subunits_Missing
728 Back_End_Mode
:= Generate_Object
;
730 -- We can generate code for a package declaration or a subprogram
731 -- declaration only if it does not required a body.
733 elsif (Main_Kind
= N_Package_Declaration
735 Main_Kind
= N_Subprogram_Declaration
)
737 (not Body_Required
(Main_Unit_Node
)
739 Distribution_Stub_Mode
= Generate_Caller_Stub_Body
)
741 Back_End_Mode
:= Generate_Object
;
743 -- We can generate code for a generic package declaration of a generic
744 -- subprogram declaration only if does not require a body.
746 elsif (Main_Kind
= N_Generic_Package_Declaration
748 Main_Kind
= N_Generic_Subprogram_Declaration
)
749 and then not Body_Required
(Main_Unit_Node
)
751 Back_End_Mode
:= Generate_Object
;
753 -- Compilation units that are renamings do not require bodies,
754 -- so we can generate code for them.
756 elsif Main_Kind
= N_Package_Renaming_Declaration
757 or else Main_Kind
= N_Subprogram_Renaming_Declaration
759 Back_End_Mode
:= Generate_Object
;
761 -- Compilation units that are generic renamings do not require bodies
762 -- so we can generate code for them.
764 elsif Main_Kind
in N_Generic_Renaming_Declaration
then
765 Back_End_Mode
:= Generate_Object
;
767 -- It's not an error to generate SCIL for e.g. a spec which has a body
769 elsif CodePeer_Mode
then
770 Back_End_Mode
:= Generate_Object
;
772 -- In all other cases (specs which have bodies, generics, and bodies
773 -- where subunits are missing), we cannot generate code and we generate
774 -- a warning message. Note that generic instantiations are gone at this
775 -- stage since they have been replaced by their instances.
778 Back_End_Mode
:= Skip
;
781 -- At this stage Back_End_Mode is set to indicate if the backend should
782 -- be called to generate code. If it is Skip, then code generation has
783 -- been turned off, even though code was requested by the original
784 -- command. This is not an error from the user point of view, but it is
785 -- an error from the point of view of the gcc driver, so we must exit
786 -- with an error status.
788 -- We generate an informative message (from the gcc point of view, it
789 -- is an error message, but from the users point of view this is not an
790 -- error, just a consequence of compiling something that cannot
793 if Back_End_Mode
= Skip
then
795 Write_Str
("cannot generate code for ");
797 Write_Name
(Unit_File_Name
(Main_Unit
));
799 if Subunits_Missing
then
800 Write_Str
(" (missing subunits)");
802 Write_Str
("to check parent unit");
804 elsif Main_Kind
= N_Subunit
then
805 Write_Str
(" (subunit)");
807 Write_Str
("to check subunit");
809 elsif Main_Kind
= N_Subprogram_Declaration
then
810 Write_Str
(" (subprogram spec)");
812 Write_Str
("to check subprogram spec");
814 -- Generic package body in GNAT implementation mode
816 elsif Main_Kind
= N_Package_Body
and then GNAT_Mode
then
817 Write_Str
(" (predefined generic)");
819 Write_Str
("to check predefined generic");
821 -- Only other case is a package spec
824 Write_Str
(" (package spec)");
826 Write_Str
("to check package spec");
829 Write_Str
(" for errors, use ");
831 if Hostparm
.OpenVMS
then
832 Write_Str
("/NOLOAD");
834 Write_Str
("-gnatc");
840 Sem_Ch13
.Validate_Unchecked_Conversions
;
841 Sem_Ch13
.Validate_Address_Clauses
;
842 Errout
.Finalize
(Last_Call
=> True);
843 Errout
.Output_Messages
;
846 Write_ALI
(Object
=> False);
850 -- Exit program with error indication, to kill object file
852 Exit_Program
(E_No_Code
);
855 -- In -gnatc mode, we only do annotation if -gnatt or -gnatR is also
856 -- set as indicated by Back_Annotate_Rep_Info being set to True.
858 -- We don't call for annotations on a subunit, because to process those
859 -- the back-end requires that the parent(s) be properly compiled.
861 -- Annotation is suppressed for targets where front-end layout is
862 -- enabled, because the front end determines representations.
864 -- Annotation is also suppressed in the case of compiling for
865 -- a VM, since representations are largely symbolic there.
867 if Back_End_Mode
= Declarations_Only
868 and then (not (Back_Annotate_Rep_Info
or Generate_SCIL
)
869 or else Main_Kind
= N_Subunit
870 or else Targparm
.Frontend_Layout_On_Target
871 or else Targparm
.VM_Target
/= No_VM
)
873 Sem_Ch13
.Validate_Unchecked_Conversions
;
874 Sem_Ch13
.Validate_Address_Clauses
;
875 Errout
.Finalize
(Last_Call
=> True);
876 Errout
.Output_Messages
;
877 Write_ALI
(Object
=> False);
885 -- Ensure that we properly register a dependency on system.ads, since
886 -- even if we do not semantically depend on this, Targparm has read
887 -- system parameters from the system.ads file.
889 Lib
.Writ
.Ensure_System_Dependency
;
891 -- Add dependencies, if any, on preprocessing data file and on
892 -- preprocessing definition file(s).
894 Prepcomp
.Add_Dependencies
;
896 -- Back end needs to explicitly unlock tables it needs to touch
909 -- ???Check_Library_Items under control of a debug flag, because it
910 -- currently does not work if the -gnatn switch (back end inlining) is
913 if Debug_Flag_Dot_WW
then
917 -- Here we call the back end to generate the output code
919 Generating_Code
:= True;
920 Back_End
.Call_Back_End
(Back_End_Mode
);
922 -- Once the backend is complete, we unlock the names table. This call
923 -- allows a few extra entries, needed for example for the file name for
924 -- the library file output.
928 -- Validate unchecked conversions (using the values for size and
929 -- alignment annotated by the backend where possible).
931 Sem_Ch13
.Validate_Unchecked_Conversions
;
933 -- Validate address clauses (again using alignment values annotated
934 -- by the backend where possible).
936 Sem_Ch13
.Validate_Address_Clauses
;
938 -- Now we complete output of errors, rep info and the tree info. These
939 -- are delayed till now, since it is perfectly possible for gigi to
940 -- generate errors, modify the tree (in particular by setting flags
941 -- indicating that elaboration is required, and also to back annotate
942 -- representation information for List_Rep_Info.
944 Errout
.Finalize
(Last_Call
=> True);
945 Errout
.Output_Messages
;
948 -- Only write the library if the backend did not generate any error
949 -- messages. Otherwise signal errors to the driver program so that
950 -- there will be no attempt to generate an object file.
952 if Compilation_Errors
then
954 Exit_Program
(E_Errors
);
957 Write_ALI
(Object
=> (Back_End_Mode
= Generate_Object
));
959 -- Generate the ASIS tree after writing the ALI file, since in ASIS
960 -- mode, Write_ALI may in fact result in further tree decoration from
961 -- the original tree file. Note that we dump the tree just before
962 -- generating it, so that the dump will exactly reflect what is written
968 -- Finalize name table and we are all done
973 -- Handle fatal internal compiler errors
975 when Rtsfind
.RE_Not_Available
=>
976 Comperr
.Compiler_Abort
("RE_Not_Available");
978 when System
.Assertions
.Assert_Failure
=>
979 Comperr
.Compiler_Abort
("Assert_Failure");
981 when Constraint_Error
=>
982 Comperr
.Compiler_Abort
("Constraint_Error");
984 when Program_Error
=>
985 Comperr
.Compiler_Abort
("Program_Error");
987 when Storage_Error
=>
989 -- Assume this is a bug. If it is real, the message will in any case
990 -- say Storage_Error, giving a strong hint!
992 Comperr
.Compiler_Abort
("Storage_Error");
998 -- The outer exception handles an unrecoverable error
1001 when Unrecoverable_Error
=>
1002 Errout
.Finalize
(Last_Call
=> True);
1003 Errout
.Output_Messages
;
1006 Write_Str
("compilation abandoned");
1009 Set_Standard_Output
;
1012 Exit_Program
(E_Errors
);