1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2008, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 with Atree; use Atree;
27 with Back_End; use Back_End;
29 with Csets; use Csets;
30 with Debug; use Debug;
32 with Errout; use Errout;
34 with Fname; use Fname;
35 with Fname.UF; use Fname.UF;
37 with Gnatvsn; use Gnatvsn;
41 with Lib.Writ; use Lib.Writ;
43 with Namet; use Namet;
46 with Osint; use Osint;
47 with Output; use Output;
49 with Repinfo; use Repinfo;
59 with Sinfo; use Sinfo;
60 with Sinput.L; use Sinput.L;
62 with Sprint; use Sprint;
64 with Targparm; use Targparm;
66 with Treepr; use Treepr;
68 with Types; use Types;
69 with Uintp; use Uintp;
70 with Uname; use Uname;
74 with System.Assertions;
77 Main_Unit_Node : Node_Id;
78 -- Compilation unit node for main unit
80 Main_Kind : Node_Kind;
81 -- Kind of main compilation unit node
83 Back_End_Mode : Back_End.Back_End_Mode_Type;
84 -- Record back end mode
86 procedure Check_Bad_Body;
87 -- Called to check if the unit we are compiling has a bad body
89 procedure Check_Rep_Info;
90 -- Called when we are not generating code, to check if -gnatR was requested
91 -- and if so, explain that we will not be honoring the request.
97 procedure Check_Bad_Body is
98 Sname : Unit_Name_Type;
99 Src_Ind : Source_File_Index;
100 Fname : File_Name_Type;
102 procedure Bad_Body_Error (Msg : String);
103 -- Issue message for bad body found
109 procedure Bad_Body_Error (Msg : String) is
111 Error_Msg_N (Msg, Main_Unit_Node);
112 Error_Msg_File_1 := Fname;
113 Error_Msg_N ("remove incorrect body in file{!", Main_Unit_Node);
116 -- Start of processing for Check_Bad_Body
119 -- Nothing to do if we are only checking syntax, because we don't know
120 -- enough to know if we require or forbid a body in this case.
122 if Operating_Mode = Check_Syntax then
126 -- Check for body not allowed
128 if (Main_Kind = N_Package_Declaration
129 and then not Body_Required (Main_Unit_Node))
130 or else (Main_Kind = N_Generic_Package_Declaration
131 and then not Body_Required (Main_Unit_Node))
132 or else Main_Kind = N_Package_Renaming_Declaration
133 or else Main_Kind = N_Subprogram_Renaming_Declaration
134 or else Nkind (Original_Node (Unit (Main_Unit_Node)))
135 in N_Generic_Instantiation
137 Sname := Unit_Name (Main_Unit);
139 -- If we do not already have a body name, then get the body name
140 -- (but how can we have a body name here ???)
142 if not Is_Body_Name (Sname) then
143 Sname := Get_Body_Name (Sname);
146 Fname := Get_File_Name (Sname, Subunit => False);
147 Src_Ind := Load_Source_File (Fname);
149 -- Case where body is present and it is not a subunit. Exclude
150 -- the subunit case, because it has nothing to do with the
151 -- package we are compiling. It is illegal for a child unit and a
152 -- subunit with the same expanded name (RM 10.2(9)) to appear
153 -- together in a partition, but there is nothing to stop a
154 -- compilation environment from having both, and the test here
155 -- simply allows that. If there is an attempt to include both in
156 -- a partition, this is diagnosed at bind time. In Ada 83 mode
157 -- this is not a warning case.
159 -- Note: if weird file names are being used, we can have
160 -- situation where the file name that supposedly contains body,
161 -- in fact contains a spec, or we can't tell what it contains.
162 -- Skip the error message in these cases.
164 -- Also ignore body that is nothing but pragma No_Body; (that's the
165 -- whole point of this pragma, to be used this way and to cause the
166 -- body file to be ignored in this context).
168 if Src_Ind /= No_Source_File
169 and then Get_Expected_Unit_Type (Fname) = Expect_Body
170 and then not Source_File_Is_Subunit (Src_Ind)
171 and then not Source_File_Is_No_Body (Src_Ind)
173 Errout.Finalize (Last_Call => False);
175 Error_Msg_Unit_1 := Sname;
177 -- Ada 83 case of a package body being ignored. This is not an
178 -- error as far as the Ada 83 RM is concerned, but it is almost
179 -- certainly not what is wanted so output a warning. Give this
180 -- message only if there were no errors, since otherwise it may
181 -- be incorrect (we may have misinterpreted a junk spec as not
182 -- needing a body when it really does).
184 if Main_Kind = N_Package_Declaration
185 and then Ada_Version = Ada_83
186 and then Operating_Mode = Generate_Code
187 and then Distribution_Stub_Mode /= Generate_Caller_Stub_Body
188 and then not Compilation_Errors
191 ("package $$ does not require a body?", Main_Unit_Node);
192 Error_Msg_File_1 := Fname;
193 Error_Msg_N ("body in file{? will be ignored", Main_Unit_Node);
195 -- Ada 95 cases of a body file present when no body is
196 -- permitted. This we consider to be an error.
199 -- For generic instantiations, we never allow a body
201 if Nkind (Original_Node (Unit (Main_Unit_Node)))
202 in N_Generic_Instantiation
205 ("generic instantiation for $$ does not allow a body");
207 -- A library unit that is a renaming never allows a body
209 elsif Main_Kind in N_Renaming_Declaration then
211 ("renaming declaration for $$ does not allow a body!");
213 -- Remaining cases are packages and generic packages. Here
214 -- we only do the test if there are no previous errors,
215 -- because if there are errors, they may lead us to
216 -- incorrectly believe that a package does not allow a body
217 -- when in fact it does.
219 elsif not Compilation_Errors then
220 if Main_Kind = N_Package_Declaration then
222 ("package $$ does not allow a body!");
224 elsif Main_Kind = N_Generic_Package_Declaration then
226 ("generic package $$ does not allow a body!");
239 procedure Check_Rep_Info is
241 if List_Representation_Info /= 0
242 or else List_Representation_Info_Mechanisms
247 ("cannot generate representation information, no code generated");
254 -- Start of processing for Gnat1drv
257 -- This inner block is set up to catch assertion errors and constraint
258 -- errors. Since the code for handling these errors can cause another
259 -- exception to be raised (namely Unrecoverable_Error), we need two
260 -- nested blocks, so that the outer one handles unrecoverable error.
263 -- Lib.Initialize need to be called before Scan_Compiler_Arguments,
264 -- because it initializes a table filled by Scan_Compiler_Arguments.
270 Scan_Compiler_Arguments;
271 Osint.Add_Default_Search_Dirs;
289 Sem_Type.Init_Interp_Tables;
291 -- Acquire target parameters from system.ads (source of package System)
296 S : Source_File_Index;
300 Name_Buffer (1 .. 10) := "system.ads";
303 S := Load_Source_File (N);
305 if S = No_Source_File then
307 ("fatal error, run-time library not installed correctly");
309 ("cannot locate file system.ads");
310 raise Unrecoverable_Error;
312 -- Remember source index of system.ads (which was read successfully)
315 System_Source_File_Index := S;
318 Targparm.Get_Target_Parameters
319 (System_Text => Source_Text (S),
320 Source_First => Source_First (S),
321 Source_Last => Source_Last (S));
323 -- Acquire configuration pragma information from Targparm
325 Restrict.Restrictions := Targparm.Restrictions_On_Target;
328 -- Set Configurable_Run_Time mode if system.ads flag set
330 if Targparm.Configurable_Run_Time_On_Target or Debug_Flag_YY then
331 Configurable_Run_Time_Mode := True;
334 -- Set -gnatR3m mode if debug flag A set
336 if Debug_Flag_AA then
337 Back_Annotate_Rep_Info := True;
338 List_Representation_Info := 1;
339 List_Representation_Info_Mechanisms := True;
342 -- Disable static allocation of dispatch tables if -gnatd.t or if layout
343 -- is enabled. The front end's layout phase currently treats types that
344 -- have discriminant-dependent arrays as not being static even when a
345 -- discriminant constraint on the type is static, and this leads to
346 -- problems with subtypes of type Ada.Tags.Dispatch_Table_Wrapper. ???
348 if Debug_Flag_Dot_T or else Frontend_Layout_On_Target then
349 Static_Dispatch_Tables := False;
352 -- Output copyright notice if full list mode unless we have a list
353 -- file, in which case we defer this so that it is output in the file
355 if (Verbose_Mode or else (Full_List and then Full_List_File_Name = null))
356 and then not Debug_Flag_7
360 Write_Str (Gnat_Version_String);
362 Write_Str ("Copyright 1992-" &
364 ", Free Software Foundation, Inc.");
368 -- Before we do anything else, adjust certain global values for
369 -- debug switches which modify their normal natural settings.
372 Ttypes.Bytes_Big_Endian := not Ttypes.Bytes_Big_Endian;
375 -- Deal with forcing OpenVMS switches Ture if debug flag M is set, but
376 -- record the setting of Targparm.Open_VMS_On_Target in True_VMS_Target
377 -- before doing this.
379 Opt.True_VMS_Target := Targparm.OpenVMS_On_Target;
382 Targparm.OpenVMS_On_Target := True;
383 Hostparm.OpenVMS := True;
386 if Debug_Flag_FF then
387 Targparm.Frontend_Layout_On_Target := True;
390 -- We take the default exception mechanism into account
392 if Targparm.ZCX_By_Default_On_Target then
393 if Targparm.GCC_ZCX_Support_On_Target then
394 Exception_Mechanism := Back_End_Exceptions;
397 ("Zero Cost Exceptions not supported on this target");
401 -- Set proper status for overflow checks. We turn on overflow checks
402 -- if -gnatp was not specified, and either -gnato is set or the back
403 -- end takes care of overflow checks. Otherwise we suppress overflow
404 -- checks by default (since front end checks are expensive).
406 if not Opt.Suppress_Checks
407 and then (Opt.Enable_Overflow_Checks
409 (Targparm.Backend_Divide_Checks_On_Target
411 Targparm.Backend_Overflow_Checks_On_Target))
413 Suppress_Options (Overflow_Check) := False;
415 Suppress_Options (Overflow_Check) := True;
418 -- Check we do not have more than one source file, this happens only in
419 -- the case where the driver is called directly, it cannot happen when
420 -- gnat1 is invoked from gcc in the normal case.
422 if Osint.Number_Of_Files /= 1 then
425 Osint.Fail ("you must provide one source file");
427 elsif Usage_Requested then
431 Original_Operating_Mode := Operating_Mode;
434 -- Exit with errors if the main source could not be parsed
436 if Sinput.Main_Source_File = No_Source_File then
437 Errout.Finalize (Last_Call => True);
438 Errout.Output_Messages;
439 Exit_Program (E_Errors);
442 Main_Unit_Node := Cunit (Main_Unit);
443 Main_Kind := Nkind (Unit (Main_Unit_Node));
446 -- Exit if compilation errors detected
448 Errout.Finalize (Last_Call => False);
450 if Compilation_Errors then
452 Sem_Ch13.Validate_Unchecked_Conversions;
453 Sem_Ch13.Validate_Address_Clauses;
454 Errout.Output_Messages;
457 -- Generate ALI file if specially requested
459 if Opt.Force_ALI_Tree_File then
460 Write_ALI (Object => False);
464 Errout.Finalize (Last_Call => True);
465 Exit_Program (E_Errors);
468 -- Set Generate_Code on main unit and its spec. We do this even if are
469 -- not generating code, since Lib-Writ uses this to determine which
470 -- units get written in the ali file.
472 Set_Generate_Code (Main_Unit);
474 -- If we have a corresponding spec, then we need object
475 -- code for the spec unit as well
477 if Nkind (Unit (Main_Unit_Node)) in N_Unit_Body
478 and then not Acts_As_Spec (Main_Unit_Node)
481 (Get_Cunit_Unit_Number (Library_Unit (Main_Unit_Node)));
484 -- Case of no code required to be generated, exit indicating no error
486 if Original_Operating_Mode = Check_Syntax then
488 Errout.Finalize (Last_Call => True);
489 Errout.Output_Messages;
494 -- Use a goto instead of calling Exit_Program so that finalization
499 elsif Original_Operating_Mode = Check_Semantics then
500 Back_End_Mode := Declarations_Only;
502 -- All remaining cases are cases in which the user requested that code
503 -- be generated (i.e. no -gnatc or -gnats switch was used). Check if
504 -- we can in fact satisfy this request.
506 -- Cannot generate code if someone has turned off code generation for
507 -- any reason at all. We will try to figure out a reason below.
509 elsif Operating_Mode /= Generate_Code then
510 Back_End_Mode := Skip;
512 -- We can generate code for a subprogram body unless there were missing
513 -- subunits. Note that we always generate code for all generic units (a
514 -- change from some previous versions of GNAT).
516 elsif Main_Kind = N_Subprogram_Body
517 and then not Subunits_Missing
519 Back_End_Mode := Generate_Object;
521 -- We can generate code for a package body unless there are subunits
522 -- missing (note that we always generate code for generic units, which
523 -- is a change from some earlier versions of GNAT).
525 elsif Main_Kind = N_Package_Body
526 and then not Subunits_Missing
528 Back_End_Mode := Generate_Object;
530 -- We can generate code for a package declaration or a subprogram
531 -- declaration only if it does not required a body.
533 elsif (Main_Kind = N_Package_Declaration
535 Main_Kind = N_Subprogram_Declaration)
537 (not Body_Required (Main_Unit_Node)
539 Distribution_Stub_Mode = Generate_Caller_Stub_Body)
541 Back_End_Mode := Generate_Object;
543 -- We can generate code for a generic package declaration of a generic
544 -- subprogram declaration only if does not require a body.
546 elsif (Main_Kind = N_Generic_Package_Declaration
548 Main_Kind = N_Generic_Subprogram_Declaration)
549 and then not Body_Required (Main_Unit_Node)
551 Back_End_Mode := Generate_Object;
553 -- Compilation units that are renamings do not require bodies,
554 -- so we can generate code for them.
556 elsif Main_Kind = N_Package_Renaming_Declaration
557 or else Main_Kind = N_Subprogram_Renaming_Declaration
559 Back_End_Mode := Generate_Object;
561 -- Compilation units that are generic renamings do not require bodies
562 -- so we can generate code for them.
564 elsif Main_Kind in N_Generic_Renaming_Declaration then
565 Back_End_Mode := Generate_Object;
567 -- In all other cases (specs which have bodies, generics, and bodies
568 -- where subunits are missing), we cannot generate code and we generate
569 -- a warning message. Note that generic instantiations are gone at this
570 -- stage since they have been replaced by their instances.
573 Back_End_Mode := Skip;
576 -- At this stage Call_Back_End is set to indicate if the backend should
577 -- be called to generate code. If it is not set, then code generation
578 -- has been turned off, even though code was requested by the original
579 -- command. This is not an error from the user point of view, but it is
580 -- an error from the point of view of the gcc driver, so we must exit
581 -- with an error status.
583 -- We generate an informative message (from the gcc point of view, it
584 -- is an error message, but from the users point of view this is not an
585 -- error, just a consequence of compiling something that cannot
588 if Back_End_Mode = Skip then
590 Write_Str ("cannot generate code for ");
592 Write_Name (Unit_File_Name (Main_Unit));
594 if Subunits_Missing then
595 Write_Str (" (missing subunits)");
597 Write_Str ("to check parent unit");
599 elsif Main_Kind = N_Subunit then
600 Write_Str (" (subunit)");
602 Write_Str ("to check subunit");
604 elsif Main_Kind = N_Subprogram_Declaration then
605 Write_Str (" (subprogram spec)");
607 Write_Str ("to check subprogram spec");
609 -- Generic package body in GNAT implementation mode
611 elsif Main_Kind = N_Package_Body and then GNAT_Mode then
612 Write_Str (" (predefined generic)");
614 Write_Str ("to check predefined generic");
616 -- Only other case is a package spec
619 Write_Str (" (package spec)");
621 Write_Str ("to check package spec");
624 Write_Str (" for errors, use ");
626 if Hostparm.OpenVMS then
627 Write_Str ("/NOLOAD");
629 Write_Str ("-gnatc");
635 Sem_Ch13.Validate_Unchecked_Conversions;
636 Sem_Ch13.Validate_Address_Clauses;
637 Errout.Finalize (Last_Call => True);
638 Errout.Output_Messages;
641 Write_ALI (Object => False);
645 -- Exit program with error indication, to kill object file
647 Exit_Program (E_No_Code);
650 -- In -gnatc mode, we only do annotation if -gnatt or -gnatR is also
651 -- set as indicated by Back_Annotate_Rep_Info being set to True.
653 -- We don't call for annotations on a subunit, because to process those
654 -- the back-end requires that the parent(s) be properly compiled.
656 -- Annotation is suppressed for targets where front-end layout is
657 -- enabled, because the front end determines representations.
659 -- Annotation is also suppressed in the case of compiling for
660 -- a VM, since representations are largely symbolic there.
662 if Back_End_Mode = Declarations_Only
663 and then (not Back_Annotate_Rep_Info
664 or else Main_Kind = N_Subunit
665 or else Targparm.Frontend_Layout_On_Target
666 or else Targparm.VM_Target /= No_VM)
668 Sem_Ch13.Validate_Unchecked_Conversions;
669 Sem_Ch13.Validate_Address_Clauses;
670 Errout.Finalize (Last_Call => True);
671 Errout.Output_Messages;
672 Write_ALI (Object => False);
680 -- Ensure that we properly register a dependency on system.ads, since
681 -- even if we do not semantically depend on this, Targparm has read
682 -- system parameters from the system.ads file.
684 Lib.Writ.Ensure_System_Dependency;
686 -- Add dependencies, if any, on preprocessing data file and on
687 -- preprocessing definition file(s).
689 Prepcomp.Add_Dependencies;
691 -- Back end needs to explicitly unlock tables it needs to touch
704 -- Here we call the back end to generate the output code
706 Generating_Code := True;
707 Back_End.Call_Back_End (Back_End_Mode);
709 -- Once the backend is complete, we unlock the names table. This call
710 -- allows a few extra entries, needed for example for the file name for
711 -- the library file output.
715 -- Validate unchecked conversions (using the values for size and
716 -- alignment annotated by the backend where possible).
718 Sem_Ch13.Validate_Unchecked_Conversions;
720 -- Validate address clauses (again using alignment values annotated
721 -- by the backend where possible).
723 Sem_Ch13.Validate_Address_Clauses;
725 -- Now we complete output of errors, rep info and the tree info. These
726 -- are delayed till now, since it is perfectly possible for gigi to
727 -- generate errors, modify the tree (in particular by setting flags
728 -- indicating that elaboration is required, and also to back annotate
729 -- representation information for List_Rep_Info.
731 Errout.Finalize (Last_Call => True);
732 Errout.Output_Messages;
735 -- Only write the library if the backend did not generate any error
736 -- messages. Otherwise signal errors to the driver program so that
737 -- there will be no attempt to generate an object file.
739 if Compilation_Errors then
741 Exit_Program (E_Errors);
744 Write_ALI (Object => (Back_End_Mode = Generate_Object));
746 -- Generate the ASIS tree after writing the ALI file, since in ASIS
747 -- mode, Write_ALI may in fact result in further tree decoration from
748 -- the original tree file. Note that we dump the tree just before
749 -- generating it, so that the dump will exactly reflect what is written
755 -- Finalize name table and we are all done
760 -- Handle fatal internal compiler errors
762 when Rtsfind.RE_Not_Available =>
763 Comperr.Compiler_Abort ("RE_Not_Available");
765 when System.Assertions.Assert_Failure =>
766 Comperr.Compiler_Abort ("Assert_Failure");
768 when Constraint_Error =>
769 Comperr.Compiler_Abort ("Constraint_Error");
771 when Program_Error =>
772 Comperr.Compiler_Abort ("Program_Error");
774 when Storage_Error =>
776 -- Assume this is a bug. If it is real, the message will in any case
777 -- say Storage_Error, giving a strong hint!
779 Comperr.Compiler_Abort ("Storage_Error");
785 -- The outer exception handles an unrecoverable error
788 when Unrecoverable_Error =>
789 Errout.Finalize (Last_Call => True);
790 Errout.Output_Messages;
793 Write_Str ("compilation abandoned");
799 Exit_Program (E_Errors);