1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2015, 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
;
30 with Csets
; use Csets
;
31 with Debug
; use Debug
;
33 with Errout
; use Errout
;
36 with Fname
; use Fname
;
37 with Fname
.UF
; use Fname
.UF
;
40 with Gnatvsn
; use Gnatvsn
;
43 with Lib
.Writ
; use Lib
.Writ
;
45 with Namet
; use Namet
;
48 with Osint
; use Osint
;
49 with Output
; use Output
;
52 with Repinfo
; use Repinfo
;
54 with Rident
; use Rident
;
65 with Sinfo
; use Sinfo
;
66 with Sinput
.L
; use Sinput
.L
;
68 with Sprint
; use Sprint
;
70 with Stylesw
; use Stylesw
;
71 with Targparm
; use Targparm
;
74 with Treepr
; use Treepr
;
76 with Types
; use Types
;
77 with Uintp
; use Uintp
;
78 with Uname
; use Uname
;
81 with Validsw
; use Validsw
;
83 with System
.Assertions
;
91 Main_Unit_Node
: Node_Id
;
92 -- Compilation unit node for main unit
94 Main_Kind
: Node_Kind
;
95 -- Kind of main compilation unit node
97 Back_End_Mode
: Back_End
.Back_End_Mode_Type
;
98 -- Record back end mode
100 procedure Adjust_Global_Switches
;
101 -- There are various interactions between front end switch settings,
102 -- including debug switch settings and target dependent parameters.
103 -- This procedure takes care of properly handling these interactions.
104 -- We do it after scanning out all the switches, so that we are not
105 -- depending on the order in which switches appear.
107 procedure Check_Bad_Body
;
108 -- Called to check if the unit we are compiling has a bad body
110 procedure Check_Rep_Info
;
111 -- Called when we are not generating code, to check if -gnatR was requested
112 -- and if so, explain that we will not be honoring the request.
114 procedure Post_Compilation_Validation_Checks
;
115 -- This procedure performs various validation checks that have to be left
116 -- to the end of the compilation process, after generating code but before
117 -- issuing error messages. In particular, these checks generally require
118 -- the information provided by the back end in back annotation of declared
119 -- entities (e.g. actual size and alignment values chosen by the back end).
121 ----------------------------
122 -- Adjust_Global_Switches --
123 ----------------------------
125 procedure Adjust_Global_Switches
is
127 -- -gnatd.M enables Relaxed_RM_Semantics
129 if Debug_Flag_Dot_MM
then
130 Relaxed_RM_Semantics
:= True;
133 -- -gnatd.1 enables unnesting of subprograms
135 if Debug_Flag_Dot_1
then
136 Unnest_Subprogram_Mode
:= True;
139 -- -gnatd.u enables special C expansion mode
141 if Debug_Flag_Dot_U
then
142 Modify_Tree_For_C
:= True;
145 -- Set all flags required when generating C code
147 if Generate_C_Code
then
148 Modify_Tree_For_C
:= True;
149 Unnest_Subprogram_Mode
:= True;
151 -- Set operating mode to Generate_Code to benefit from full front-end
152 -- expansion (e.g. generics).
154 Operating_Mode
:= Generate_Code
;
156 -- Suppress alignment checks since we do not have access to alignment
157 -- info on the target.
159 Suppress_Options
.Suppress
(Alignment_Check
) := False;
162 -- -gnatd.E sets Error_To_Warning mode, causing selected error messages
163 -- to be treated as warnings instead of errors.
165 if Debug_Flag_Dot_EE
then
166 Error_To_Warning
:= True;
169 -- Disable CodePeer_Mode in Check_Syntax, since we need front-end
172 if Operating_Mode
= Check_Syntax
then
173 CodePeer_Mode
:= False;
176 -- Set ASIS mode if -gnatt and -gnatc are set
178 if Operating_Mode
= Check_Semantics
and then Tree_Output
then
181 -- Turn off inlining in ASIS mode, since ASIS cannot handle the extra
182 -- information in the trees caused by inlining being active.
184 -- More specifically, the tree seems to be malformed from the ASIS
185 -- point of view if -gnatc and -gnatn appear together???
187 Inline_Active
:= False;
189 -- Turn off SCIL generation and CodePeer mode in semantics mode,
190 -- since SCIL requires front-end expansion.
192 Generate_SCIL
:= False;
193 CodePeer_Mode
:= False;
196 -- SCIL mode needs to disable front-end inlining since the generated
197 -- trees (in particular order and consistency between specs compiled
198 -- as part of a main unit or as part of a with-clause) are causing
201 if Generate_SCIL
then
202 Front_End_Inlining
:= False;
205 -- Tune settings for optimal SCIL generation in CodePeer mode
207 if CodePeer_Mode
then
209 -- Turn off gnatprove mode (which can be set via e.g. -gnatd.F), not
210 -- compatible with CodePeer mode.
212 GNATprove_Mode
:= False;
213 Debug_Flag_Dot_FF
:= False;
215 -- Turn off C tree generation, not compatible with CodePeer mode. We
216 -- do not expect this to happen in normal use, since both modes are
217 -- enabled by special tools, but it is useful to turn off these flags
218 -- this way when we are doing CodePeer tests on existing test suites
219 -- that may have -gnateg set, to avoid the need for special casing.
221 Modify_Tree_For_C
:= False;
222 Generate_C_Code
:= False;
223 Unnest_Subprogram_Mode
:= False;
225 -- Turn off inlining, confuses CodePeer output and gains nothing
227 Front_End_Inlining
:= False;
228 Inline_Active
:= False;
230 -- Disable front-end optimizations, to keep the tree as close to the
231 -- source code as possible, and also to avoid inconsistencies between
232 -- trees when using different optimization switches.
234 Optimization_Level
:= 0;
236 -- Enable some restrictions systematically to simplify the generated
237 -- code (and ease analysis). Note that restriction checks are also
238 -- disabled in CodePeer mode, see Restrict.Check_Restriction, and
239 -- user specified Restrictions pragmas are ignored, see
240 -- Sem_Prag.Process_Restrictions_Or_Restriction_Warnings.
242 Restrict
.Restrictions
.Set
(No_Exception_Registration
) := True;
243 Restrict
.Restrictions
.Set
(No_Initialize_Scalars
) := True;
244 Restrict
.Restrictions
.Set
(No_Task_Hierarchy
) := True;
245 Restrict
.Restrictions
.Set
(No_Abort_Statements
) := True;
246 Restrict
.Restrictions
.Set
(Max_Asynchronous_Select_Nesting
) := True;
247 Restrict
.Restrictions
.Value
(Max_Asynchronous_Select_Nesting
) := 0;
249 -- Suppress division by zero and access checks since they are handled
250 -- implicitly by CodePeer.
252 -- Turn off dynamic elaboration checks: generates inconsistencies in
253 -- trees between specs compiled as part of a main unit or as part of
256 -- Turn off alignment checks: these cannot be proved statically by
257 -- CodePeer and generate false positives.
259 -- Enable all other language checks
261 Suppress_Options
.Suppress
:=
262 (Access_Check
=> True,
263 Alignment_Check
=> True,
264 Division_Check
=> True,
265 Elaboration_Check
=> True,
268 Dynamic_Elaboration_Checks
:= False;
270 -- Set STRICT mode for overflow checks if not set explicitly. This
271 -- prevents suppressing of overflow checks by default, in code down
274 if Suppress_Options
.Overflow_Mode_General
= Not_Set
then
275 Suppress_Options
.Overflow_Mode_General
:= Strict
;
276 Suppress_Options
.Overflow_Mode_Assertions
:= Strict
;
279 -- CodePeer handles division and overflow checks directly, based on
280 -- the marks set by the frontend, hence no special expansion should
281 -- be performed in the frontend for division and overflow checks.
283 Backend_Divide_Checks_On_Target
:= True;
284 Backend_Overflow_Checks_On_Target
:= True;
286 -- Kill debug of generated code, since it messes up sloc values
288 Debug_Generated_Code
:= False;
290 -- Turn cross-referencing on in case it was disabled (e.g. by -gnatD)
291 -- Do we really need to spend time generating xref in CodePeer
292 -- mode??? Consider setting Xref_Active to False.
296 -- Polling mode forced off, since it generates confusing junk
298 Polling_Required
:= False;
300 -- Set operating mode to Generate_Code to benefit from full front-end
301 -- expansion (e.g. generics).
303 Operating_Mode
:= Generate_Code
;
305 -- We need SCIL generation of course
307 Generate_SCIL
:= True;
309 -- Enable assertions, since they give CodePeer valuable extra info
311 Assertions_Enabled
:= True;
313 -- Disable all simple value propagation. This is an optimization
314 -- which is valuable for code optimization, and also for generation
315 -- of compiler warnings, but these are being turned off by default,
316 -- and CodePeer generates better messages (referencing original
317 -- variables) this way.
319 Debug_Flag_MM
:= True;
321 -- Set normal RM validity checking, and checking of IN OUT parameters
322 -- (this might give CodePeer more useful checks to analyze, to be
323 -- confirmed???). All other validity checking is turned off, since
324 -- this can generate very complex trees that only confuse CodePeer
325 -- and do not bring enough useful info.
327 Reset_Validity_Check_Options
;
328 Validity_Check_Default
:= True;
329 Validity_Check_In_Out_Params
:= True;
330 Validity_Check_In_Params
:= True;
332 -- Turn off style check options and ignore any style check pragmas
333 -- since we are not interested in any front-end warnings when we are
334 -- getting CodePeer output.
336 Reset_Style_Check_Options
;
337 Ignore_Style_Checks_Pragmas
:= True;
339 -- Always perform semantics and generate ali files in CodePeer mode,
340 -- so that a gnatmake -c -k will proceed further when possible.
342 Force_ALI_Tree_File
:= True;
343 Try_Semantics
:= True;
345 -- Make the Ada front-end more liberal so that the compiler will
346 -- allow illegal code that is allowed by other compilers. CodePeer
347 -- is in the business of finding problems, not enforcing rules.
348 -- This is useful when using CodePeer mode with other compilers.
350 Relaxed_RM_Semantics
:= True;
353 -- Enable some individual switches that are implied by relaxed RM
356 if Relaxed_RM_Semantics
then
357 Opt
.Allow_Integer_Address
:= True;
358 Overriding_Renamings
:= True;
359 Treat_Categorization_Errors_As_Warnings
:= True;
362 -- Enable GNATprove_Mode when using -gnatd.F switch
364 if Debug_Flag_Dot_FF
then
365 GNATprove_Mode
:= True;
368 -- GNATprove_Mode is also activated by default in the gnat2why
371 if GNATprove_Mode
then
373 -- Turn off inlining, which would confuse formal verification output
376 Front_End_Inlining
:= False;
377 Inline_Active
:= False;
379 -- Issue warnings for failure to inline subprograms, as otherwise
380 -- expected in GNATprove mode for the local subprograms without
383 Ineffective_Inline_Warnings
:= True;
385 -- Disable front-end optimizations, to keep the tree as close to the
386 -- source code as possible, and also to avoid inconsistencies between
387 -- trees when using different optimization switches.
389 Optimization_Level
:= 0;
391 -- Enable some restrictions systematically to simplify the generated
392 -- code (and ease analysis).
394 Restrict
.Restrictions
.Set
(No_Initialize_Scalars
) := True;
396 -- Note: at this point we used to suppress various checks, but that
397 -- is not what we want. We need the semantic processing for these
398 -- checks (which will set flags like Do_Overflow_Check, showing the
399 -- points at which potential checks are required semantically). We
400 -- don't want the expansion associated with these checks, but that
401 -- happens anyway because this expansion is simply not done in the
402 -- SPARK version of the expander.
404 -- On the contrary, we need to enable explicitly all language checks,
405 -- as they may have been suppressed by the use of switch -gnatp.
407 Suppress_Options
.Suppress
:= (others => False);
409 -- Turn off dynamic elaboration checks. SPARK mode depends on the
410 -- use of the static elaboration mode.
412 Dynamic_Elaboration_Checks
:= False;
414 -- Detect overflow on unconstrained floating-point types, such as
415 -- the predefined types Float, Long_Float and Long_Long_Float from
416 -- package Standard. Not necessary if float overflows are checked
417 -- (Machine_Overflow true), since appropriate Do_Overflow_Check flags
418 -- will be set in any case.
420 Check_Float_Overflow
:= not Machine_Overflows_On_Target
;
422 -- Set STRICT mode for overflow checks if not set explicitly. This
423 -- prevents suppressing of overflow checks by default, in code down
426 if Suppress_Options
.Overflow_Mode_General
= Not_Set
then
427 Suppress_Options
.Overflow_Mode_General
:= Strict
;
428 Suppress_Options
.Overflow_Mode_Assertions
:= Strict
;
431 -- Kill debug of generated code, since it messes up sloc values
433 Debug_Generated_Code
:= False;
435 -- Turn cross-referencing on in case it was disabled (e.g. by -gnatD)
436 -- as it is needed for computing effects of subprograms in the formal
437 -- verification backend.
441 -- Polling mode forced off, since it generates confusing junk
443 Polling_Required
:= False;
445 -- Set operating mode to Check_Semantics, but a light front-end
446 -- expansion is still performed.
448 Operating_Mode
:= Check_Semantics
;
450 -- Enable assertions, since they give valuable extra information for
451 -- formal verification.
453 Assertions_Enabled
:= True;
455 -- Disable validity checks, since it generates code raising
456 -- exceptions for invalid data, which confuses GNATprove. Invalid
457 -- data is directly detected by GNATprove's flow analysis.
459 Validity_Checks_On
:= False;
461 -- Turn off style check options since we are not interested in any
462 -- front-end warnings when we are getting SPARK output.
464 Reset_Style_Check_Options
;
466 -- Suppress the generation of name tables for enumerations, which are
467 -- not needed for formal verification, and fall outside the SPARK
468 -- subset (use of pointers).
470 Global_Discard_Names
:= True;
472 -- Suppress the expansion of tagged types and dispatching calls,
473 -- which lead to the generation of non-SPARK code (use of pointers),
474 -- which is more complex to formally verify than the original source.
476 Tagged_Type_Expansion
:= False;
479 -- Set Configurable_Run_Time mode if system.ads flag set or if the
480 -- special debug flag -gnatdY is set.
482 if Targparm
.Configurable_Run_Time_On_Target
or Debug_Flag_YY
then
483 Configurable_Run_Time_Mode
:= True;
486 -- Set -gnatR3m mode if debug flag A set
488 if Debug_Flag_AA
then
489 Back_Annotate_Rep_Info
:= True;
490 List_Representation_Info
:= 1;
491 List_Representation_Info_Mechanisms
:= True;
494 -- Force Target_Strict_Alignment true if debug flag -gnatd.a is set
496 if Debug_Flag_Dot_A
then
497 Ttypes
.Target_Strict_Alignment
:= True;
500 -- Increase size of allocated entities if debug flag -gnatd.N is set
502 if Debug_Flag_Dot_NN
then
503 Atree
.Num_Extension_Nodes
:= Atree
.Num_Extension_Nodes
+ 1;
506 -- Disable static allocation of dispatch tables if -gnatd.t or if layout
507 -- is enabled. The front end's layout phase currently treats types that
508 -- have discriminant-dependent arrays as not being static even when a
509 -- discriminant constraint on the type is static, and this leads to
510 -- problems with subtypes of type Ada.Tags.Dispatch_Table_Wrapper. ???
512 if Debug_Flag_Dot_T
or else Frontend_Layout_On_Target
then
513 Static_Dispatch_Tables
:= False;
516 -- Flip endian mode if -gnatd8 set
519 Ttypes
.Bytes_Big_Endian
:= not Ttypes
.Bytes_Big_Endian
;
522 -- Activate front end layout if debug flag -gnatdF is set
524 if Debug_Flag_FF
then
525 Targparm
.Frontend_Layout_On_Target
:= True;
528 -- Set and check exception mechanism
530 case Targparm
.Frontend_Exceptions_On_Target
is
532 case Targparm
.ZCX_By_Default_On_Target
is
535 ("Run-time library configured incorrectly");
537 ("(requesting support for Frontend ZCX exceptions)");
538 raise Unrecoverable_Error
;
540 Exception_Mechanism
:= Front_End_SJLJ
;
543 case Targparm
.ZCX_By_Default_On_Target
is
545 Exception_Mechanism
:= Back_End_ZCX
;
547 Exception_Mechanism
:= Back_End_SJLJ
;
551 -- Set proper status for overflow check mechanism
553 -- If already set (by -gnato or above in SPARK or CodePeer mode) then we
554 -- have nothing to do.
556 if Opt
.Suppress_Options
.Overflow_Mode_General
/= Not_Set
then
559 -- Otherwise set overflow mode defaults
562 -- Overflow checks are on by default (Suppress set False) except in
563 -- GNAT_Mode, where we want them off by default (we are not ready to
564 -- enable overflow checks in the compiler yet, for one thing the case
565 -- of 64-bit checks needs System.Arith_64 which is not a compiler
566 -- unit and it is a pain to try to include it in the compiler.
568 Suppress_Options
.Suppress
(Overflow_Check
) := GNAT_Mode
;
570 -- Set appropriate default overflow handling mode. Note: at present
571 -- we set STRICT in all three of the following cases. They are
572 -- separated because in the future we may make different choices.
574 -- By default set STRICT mode if -gnatg in effect
577 Suppress_Options
.Overflow_Mode_General
:= Strict
;
578 Suppress_Options
.Overflow_Mode_Assertions
:= Strict
;
580 -- If we have backend divide and overflow checks, then by default
581 -- overflow checks are STRICT. Historically this code used to also
582 -- activate overflow checks, although no target currently has these
583 -- flags set, so this was dead code anyway.
585 elsif Targparm
.Backend_Divide_Checks_On_Target
587 Targparm
.Backend_Overflow_Checks_On_Target
589 Suppress_Options
.Overflow_Mode_General
:= Strict
;
590 Suppress_Options
.Overflow_Mode_Assertions
:= Strict
;
592 -- Otherwise for now, default is STRICT mode. This may change in the
593 -- future, but for now this is the compatible behavior with previous
597 Suppress_Options
.Overflow_Mode_General
:= Strict
;
598 Suppress_Options
.Overflow_Mode_Assertions
:= Strict
;
602 -- Set default for atomic synchronization. As this synchronization
603 -- between atomic accesses can be expensive, and not typically needed
604 -- on some targets, an optional target parameter can turn the option
605 -- off. Note Atomic Synchronization is implemented as check.
607 Suppress_Options
.Suppress
(Atomic_Synchronization
) :=
608 not Atomic_Sync_Default_On_Target
;
610 -- Set default for Alignment_Check, if we are on a machine with non-
611 -- strict alignment, then we suppress this check, since it is over-
612 -- zealous for such machines.
614 if not Ttypes
.Target_Strict_Alignment
then
615 Suppress_Options
.Suppress
(Alignment_Check
) := True;
618 -- Set switch indicating if back end can handle limited types, and
619 -- guarantee that no incorrect copies are made (e.g. in the context
620 -- of an if or case expression).
622 -- Debug flag -gnatd.L decisively sets usage on
624 if Debug_Flag_Dot_LL
then
625 Back_End_Handles_Limited_Types
:= True;
627 -- If no debug flag, usage off for AAMP, SCIL cases
630 or else Generate_SCIL
632 Back_End_Handles_Limited_Types
:= False;
634 -- Otherwise normal gcc back end, for now still turn flag off by
635 -- default, since there are unresolved problems in the front end.
638 Back_End_Handles_Limited_Types
:= False;
641 -- If the inlining level has not been set by the user, compute it from
642 -- the optimization level: 1 at -O1/-O2 (and -Os), 2 at -O3 and above.
644 if Inline_Level
= 0 then
645 if Optimization_Level
< 3 then
652 -- Treat -gnatn as equivalent to -gnatN for non-GCC targets
654 if Inline_Active
and not Front_End_Inlining
then
656 -- We really should have a tag for this, what if we added a new
657 -- back end some day, it would not be true for this test, but it
658 -- would be non-GCC, so this is a bit troublesome ???
660 Front_End_Inlining
:= AAMP_On_Target
or Generate_C_Code
;
663 -- Set back end inlining indication
667 -- No back end inlining available on AAMP
671 -- No back end inlining available on C generation
673 and then not Generate_C_Code
675 -- No back end inlining in GNATprove mode, since it just confuses
676 -- the formal verification process.
678 and then not GNATprove_Mode
680 -- No back end inlining if front end inlining explicitly enabled.
681 -- Done to minimize the output differences to customers still using
682 -- this deprecated switch; in addition, this behavior reduces the
683 -- output differences in old tests.
685 and then not Front_End_Inlining
687 -- Back end inlining is disabled if debug flag .z is set
689 and then not Debug_Flag_Dot_Z
;
691 -- Output warning if -gnateE specified and cannot be supported
693 if Exception_Extra_Info
694 and then Restrict
.No_Exception_Handlers_Set
698 ("warning: extra exception information (-gnateE) was specified");
701 ("warning: this capability is not available in this configuration");
706 -- Finally capture adjusted value of Suppress_Options as the initial
707 -- value for Scope_Suppress, which will be modified as we move from
708 -- scope to scope (by Suppress/Unsuppress/Overflow_Checks pragmas).
710 Sem
.Scope_Suppress
:= Opt
.Suppress_Options
;
711 end Adjust_Global_Switches
;
717 procedure Check_Bad_Body
is
718 Sname
: Unit_Name_Type
;
719 Src_Ind
: Source_File_Index
;
720 Fname
: File_Name_Type
;
722 procedure Bad_Body_Error
(Msg
: String);
723 -- Issue message for bad body found
729 procedure Bad_Body_Error
(Msg
: String) is
731 Error_Msg_N
(Msg
, Main_Unit_Node
);
732 Error_Msg_File_1
:= Fname
;
733 Error_Msg_N
("remove incorrect body in file{!", Main_Unit_Node
);
736 -- Start of processing for Check_Bad_Body
739 -- Nothing to do if we are only checking syntax, because we don't know
740 -- enough to know if we require or forbid a body in this case.
742 if Operating_Mode
= Check_Syntax
then
746 -- Check for body not allowed
748 if (Main_Kind
= N_Package_Declaration
749 and then not Body_Required
(Main_Unit_Node
))
750 or else (Main_Kind
= N_Generic_Package_Declaration
751 and then not Body_Required
(Main_Unit_Node
))
752 or else Main_Kind
= N_Package_Renaming_Declaration
753 or else Main_Kind
= N_Subprogram_Renaming_Declaration
754 or else Nkind
(Original_Node
(Unit
(Main_Unit_Node
)))
755 in N_Generic_Instantiation
757 Sname
:= Unit_Name
(Main_Unit
);
759 -- If we do not already have a body name, then get the body name
761 if not Is_Body_Name
(Sname
) then
762 Sname
:= Get_Body_Name
(Sname
);
765 Fname
:= Get_File_Name
(Sname
, Subunit
=> False);
766 Src_Ind
:= Load_Source_File
(Fname
);
768 -- Case where body is present and it is not a subunit. Exclude the
769 -- subunit case, because it has nothing to do with the package we are
770 -- compiling. It is illegal for a child unit and a subunit with the
771 -- same expanded name (RM 10.2(9)) to appear together in a partition,
772 -- but there is nothing to stop a compilation environment from having
773 -- both, and the test here simply allows that. If there is an attempt
774 -- to include both in a partition, this is diagnosed at bind time. In
775 -- Ada 83 mode this is not a warning case.
777 -- Note that in general we do not give the message if the file in
778 -- question does not look like a body. This includes weird cases,
779 -- but in particular means that if the file is just a No_Body pragma,
780 -- then we won't give the message (that's the whole point of this
781 -- pragma, to be used this way and to cause the body file to be
782 -- ignored in this context).
784 if Src_Ind
/= No_Source_File
785 and then Source_File_Is_Body
(Src_Ind
)
787 Errout
.Finalize
(Last_Call
=> False);
789 Error_Msg_Unit_1
:= Sname
;
791 -- Ada 83 case of a package body being ignored. This is not an
792 -- error as far as the Ada 83 RM is concerned, but it is almost
793 -- certainly not what is wanted so output a warning. Give this
794 -- message only if there were no errors, since otherwise it may
795 -- be incorrect (we may have misinterpreted a junk spec as not
796 -- needing a body when it really does).
798 if Main_Kind
= N_Package_Declaration
799 and then Ada_Version
= Ada_83
800 and then Operating_Mode
= Generate_Code
801 and then Distribution_Stub_Mode
/= Generate_Caller_Stub_Body
802 and then not Compilation_Errors
805 ("package $$ does not require a body??", Main_Unit_Node
);
806 Error_Msg_File_1
:= Fname
;
807 Error_Msg_N
("body in file{ will be ignored??", Main_Unit_Node
);
809 -- Ada 95 cases of a body file present when no body is
810 -- permitted. This we consider to be an error.
813 -- For generic instantiations, we never allow a body
815 if Nkind
(Original_Node
(Unit
(Main_Unit_Node
))) in
816 N_Generic_Instantiation
819 ("generic instantiation for $$ does not allow a body");
821 -- A library unit that is a renaming never allows a body
823 elsif Main_Kind
in N_Renaming_Declaration
then
825 ("renaming declaration for $$ does not allow a body!");
827 -- Remaining cases are packages and generic packages. Here
828 -- we only do the test if there are no previous errors,
829 -- because if there are errors, they may lead us to
830 -- incorrectly believe that a package does not allow a
831 -- body when in fact it does.
833 elsif not Compilation_Errors
then
834 if Main_Kind
= N_Package_Declaration
then
836 ("package $$ does not allow a body!");
838 elsif Main_Kind
= N_Generic_Package_Declaration
then
840 ("generic package $$ does not allow a body!");
853 procedure Check_Rep_Info
is
855 if List_Representation_Info
/= 0
856 or else List_Representation_Info_Mechanisms
861 ("cannot generate representation information, no code generated");
868 ----------------------------------------
869 -- Post_Compilation_Validation_Checks --
870 ----------------------------------------
872 procedure Post_Compilation_Validation_Checks
is
874 -- Validate alignment check warnings. In some cases we generate warnings
875 -- about possible alignment errors because we don't know the alignment
876 -- that will be chosen by the back end. This routine is in charge of
877 -- getting rid of those warnings if we can tell they are not needed.
879 Checks
.Validate_Alignment_Check_Warnings
;
881 -- Validate unchecked conversions (using the values for size and
882 -- alignment annotated by the backend where possible).
884 Sem_Ch13
.Validate_Unchecked_Conversions
;
886 -- Validate address clauses (again using alignment values annotated
887 -- by the backend where possible).
889 Sem_Ch13
.Validate_Address_Clauses
;
891 -- Validate independence pragmas (again using values annotated by the
892 -- back end for component layout where possible) but only for non-GCC
893 -- back ends, as this is done a priori for GCC back ends.
895 if AAMP_On_Target
then
896 Sem_Ch13
.Validate_Independence
;
899 end Post_Compilation_Validation_Checks
;
901 -- Start of processing for Gnat1drv
904 -- This inner block is set up to catch assertion errors and constraint
905 -- errors. Since the code for handling these errors can cause another
906 -- exception to be raised (namely Unrecoverable_Error), we need two
907 -- nested blocks, so that the outer one handles unrecoverable error.
910 -- Initialize all packages. For the most part, these initialization
911 -- calls can be made in any order. Exceptions are as follows:
913 -- Lib.Initialize need to be called before Scan_Compiler_Arguments,
914 -- because it initializes a table filled by Scan_Compiler_Arguments.
920 Scan_Compiler_Arguments
;
921 Osint
.Add_Default_Search_Dirs
;
942 Sem_Type
.Init_Interp_Tables
;
944 -- Capture compilation date and time
946 Opt
.Compilation_Time
:= System
.OS_Lib
.Current_Time_String
;
948 -- Get the target parameters only when -gnats is not used, to avoid
949 -- failing when there is no default runtime.
951 if Operating_Mode
/= Check_Syntax
then
953 -- Acquire target parameters from system.ads (package System source)
955 Targparm_Acquire
: declare
958 S
: Source_File_Index
;
962 Name_Buffer
(1 .. 10) := "system.ads";
965 S
:= Load_Source_File
(N
);
967 -- Failed to read system.ads, fatal error
969 if S
= No_Source_File
then
971 ("fatal error, run-time library not installed correctly");
972 Write_Line
("cannot locate file system.ads");
973 raise Unrecoverable_Error
;
975 -- Read system.ads successfully, remember its source index
978 System_Source_File_Index
:= S
;
981 -- Call to get target parameters. Note that the actual interface
982 -- routines are in Tbuild. They can't be in this procedure because
983 -- of accessibility issues.
985 Targparm
.Get_Target_Parameters
986 (System_Text
=> Source_Text
(S
),
987 Source_First
=> Source_First
(S
),
988 Source_Last
=> Source_Last
(S
),
989 Make_Id
=> Tbuild
.Make_Id
'Access,
990 Make_SC
=> Tbuild
.Make_SC
'Access,
991 Set_NOD
=> Tbuild
.Set_NOD
'Access,
992 Set_NSA
=> Tbuild
.Set_NSA
'Access,
993 Set_NUA
=> Tbuild
.Set_NUA
'Access,
994 Set_NUP
=> Tbuild
.Set_NUP
'Access);
996 -- Acquire configuration pragma information from Targparm
998 Restrict
.Restrictions
:= Targparm
.Restrictions_On_Target
;
999 end Targparm_Acquire
;
1002 -- Perform various adjustments and settings of global switches
1004 Adjust_Global_Switches
;
1006 -- Output copyright notice if full list mode unless we have a list
1007 -- file, in which case we defer this so that it is output in the file.
1009 if (Verbose_Mode
or else (Full_List
and then Full_List_File_Name
= null))
1011 -- Debug flag gnatd7 suppresses this copyright notice
1013 and then not Debug_Flag_7
1016 Write_Str
("GNAT ");
1017 Write_Str
(Gnat_Version_String
);
1019 Write_Str
("Copyright 1992-" & Current_Year
1020 & ", Free Software Foundation, Inc.");
1024 -- Check we do not have more than one source file, this happens only in
1025 -- the case where the driver is called directly, it cannot happen when
1026 -- gnat1 is invoked from gcc in the normal case.
1028 if Osint
.Number_Of_Files
/= 1 then
1031 Osint
.Fail
("you must provide one source file");
1033 elsif Usage_Requested
then
1037 -- Generate target dependent output file if requested
1039 if Target_Dependent_Info_Write_Name
/= null then
1040 Set_Targ
.Write_Target_Dependent_Values
;
1043 -- Call the front end
1045 Original_Operating_Mode
:= Operating_Mode
;
1048 -- Exit with errors if the main source could not be parsed
1050 if Sinput
.Main_Source_File
= No_Source_File
then
1051 Errout
.Finalize
(Last_Call
=> True);
1052 Errout
.Output_Messages
;
1053 Exit_Program
(E_Errors
);
1056 Main_Unit_Node
:= Cunit
(Main_Unit
);
1057 Main_Kind
:= Nkind
(Unit
(Main_Unit_Node
));
1060 -- In CodePeer mode we always delete old SCIL files before regenerating
1061 -- new ones, in case of e.g. errors, and also to remove obsolete scilx
1062 -- files generated by CodePeer itself.
1064 if CodePeer_Mode
then
1065 Comperr
.Delete_SCIL_Files
;
1068 -- Exit if compilation errors detected
1070 Errout
.Finalize
(Last_Call
=> False);
1072 if Compilation_Errors
then
1074 Post_Compilation_Validation_Checks
;
1075 Errout
.Output_Messages
;
1078 -- Generate ALI file if specially requested
1080 if Opt
.Force_ALI_Tree_File
then
1081 Write_ALI
(Object
=> False);
1085 Errout
.Finalize
(Last_Call
=> True);
1086 Exit_Program
(E_Errors
);
1089 -- Set Generate_Code on main unit and its spec. We do this even if are
1090 -- not generating code, since Lib-Writ uses this to determine which
1091 -- units get written in the ali file.
1093 Set_Generate_Code
(Main_Unit
);
1095 -- If we have a corresponding spec, and it comes from source or it is
1096 -- not a generated spec for a child subprogram body, then we need object
1097 -- code for the spec unit as well.
1099 if Nkind
(Unit
(Main_Unit_Node
)) in N_Unit_Body
1100 and then not Acts_As_Spec
(Main_Unit_Node
)
1102 if Nkind
(Unit
(Main_Unit_Node
)) = N_Subprogram_Body
1103 and then not Comes_From_Source
(Library_Unit
(Main_Unit_Node
))
1108 (Get_Cunit_Unit_Number
(Library_Unit
(Main_Unit_Node
)));
1112 -- Case of no code required to be generated, exit indicating no error
1114 if Original_Operating_Mode
= Check_Syntax
then
1116 Errout
.Finalize
(Last_Call
=> True);
1117 Errout
.Output_Messages
;
1122 -- Use a goto instead of calling Exit_Program so that finalization
1125 goto End_Of_Program
;
1127 elsif Original_Operating_Mode
= Check_Semantics
then
1128 Back_End_Mode
:= Declarations_Only
;
1130 -- All remaining cases are cases in which the user requested that code
1131 -- be generated (i.e. no -gnatc or -gnats switch was used). Check if we
1132 -- can in fact satisfy this request.
1134 -- Cannot generate code if someone has turned off code generation for
1135 -- any reason at all. We will try to figure out a reason below.
1137 elsif Operating_Mode
/= Generate_Code
then
1138 Back_End_Mode
:= Skip
;
1140 -- We can generate code for a subprogram body unless there were missing
1141 -- subunits. Note that we always generate code for all generic units (a
1142 -- change from some previous versions of GNAT).
1144 elsif Main_Kind
= N_Subprogram_Body
and then not Subunits_Missing
then
1145 Back_End_Mode
:= Generate_Object
;
1147 -- We can generate code for a package body unless there are subunits
1148 -- missing (note that we always generate code for generic units, which
1149 -- is a change from some earlier versions of GNAT).
1151 elsif Main_Kind
= N_Package_Body
and then not Subunits_Missing
then
1152 Back_End_Mode
:= Generate_Object
;
1154 -- We can generate code for a package declaration or a subprogram
1155 -- declaration only if it does not required a body.
1157 elsif Nkind_In
(Main_Kind
,
1158 N_Package_Declaration
,
1159 N_Subprogram_Declaration
)
1161 (not Body_Required
(Main_Unit_Node
)
1163 Distribution_Stub_Mode
= Generate_Caller_Stub_Body
)
1165 Back_End_Mode
:= Generate_Object
;
1167 -- We can generate code for a generic package declaration of a generic
1168 -- subprogram declaration only if does not require a body.
1170 elsif Nkind_In
(Main_Kind
, N_Generic_Package_Declaration
,
1171 N_Generic_Subprogram_Declaration
)
1172 and then not Body_Required
(Main_Unit_Node
)
1174 Back_End_Mode
:= Generate_Object
;
1176 -- Compilation units that are renamings do not require bodies, so we can
1177 -- generate code for them.
1179 elsif Nkind_In
(Main_Kind
, N_Package_Renaming_Declaration
,
1180 N_Subprogram_Renaming_Declaration
)
1182 Back_End_Mode
:= Generate_Object
;
1184 -- Compilation units that are generic renamings do not require bodies
1185 -- so we can generate code for them.
1187 elsif Main_Kind
in N_Generic_Renaming_Declaration
then
1188 Back_End_Mode
:= Generate_Object
;
1190 -- It is not an error to analyze in CodePeer mode a spec which requires
1191 -- a body, in order to generate SCIL for this spec.
1192 -- Ditto for Generate_C_Code mode and generate a C header for a spec.
1194 elsif CodePeer_Mode
or Generate_C_Code
then
1195 Back_End_Mode
:= Generate_Object
;
1197 -- It is not an error to analyze in GNATprove mode a spec which requires
1198 -- a body, when the body is not available. During frame condition
1199 -- generation, the corresponding ALI file is generated. During
1200 -- analysis, the spec is analyzed.
1202 elsif GNATprove_Mode
then
1203 Back_End_Mode
:= Declarations_Only
;
1205 -- In all other cases (specs which have bodies, generics, and bodies
1206 -- where subunits are missing), we cannot generate code and we generate
1207 -- a warning message. Note that generic instantiations are gone at this
1208 -- stage since they have been replaced by their instances.
1211 Back_End_Mode
:= Skip
;
1214 -- At this stage Back_End_Mode is set to indicate if the backend should
1215 -- be called to generate code. If it is Skip, then code generation has
1216 -- been turned off, even though code was requested by the original
1217 -- command. This is not an error from the user point of view, but it is
1218 -- an error from the point of view of the gcc driver, so we must exit
1219 -- with an error status.
1221 -- We generate an informative message (from the gcc point of view, it
1222 -- is an error message, but from the users point of view this is not an
1223 -- error, just a consequence of compiling something that cannot
1226 if Back_End_Mode
= Skip
then
1228 Write_Str
("cannot generate code for ");
1229 Write_Str
("file ");
1230 Write_Name
(Unit_File_Name
(Main_Unit
));
1232 if Subunits_Missing
then
1233 Write_Str
(" (missing subunits)");
1236 -- Force generation of ALI file, for backward compatibility
1238 Opt
.Force_ALI_Tree_File
:= True;
1240 elsif Main_Kind
= N_Subunit
then
1241 Write_Str
(" (subunit)");
1244 -- Force generation of ALI file, for backward compatibility
1246 Opt
.Force_ALI_Tree_File
:= True;
1248 elsif Main_Kind
= N_Subprogram_Declaration
then
1249 Write_Str
(" (subprogram spec)");
1252 -- Generic package body in GNAT implementation mode
1254 elsif Main_Kind
= N_Package_Body
and then GNAT_Mode
then
1255 Write_Str
(" (predefined generic)");
1258 -- Force generation of ALI file, for backward compatibility
1260 Opt
.Force_ALI_Tree_File
:= True;
1262 -- Only other case is a package spec
1265 Write_Str
(" (package spec)");
1269 Set_Standard_Output
;
1271 Post_Compilation_Validation_Checks
;
1272 Errout
.Finalize
(Last_Call
=> True);
1273 Errout
.Output_Messages
;
1277 -- Generate ALI file if specially requested, or for missing subunits,
1278 -- subunits or predefined generic.
1280 if Opt
.Force_ALI_Tree_File
then
1281 Write_ALI
(Object
=> False);
1287 -- Exit program with error indication, to kill object file
1289 Exit_Program
(E_No_Code
);
1292 -- In -gnatc mode, we only do annotation if -gnatt or -gnatR is also set
1293 -- as indicated by Back_Annotate_Rep_Info being set to True.
1295 -- We don't call for annotations on a subunit, because to process those
1296 -- the back-end requires that the parent(s) be properly compiled.
1298 -- Annotation is suppressed for targets where front-end layout is
1299 -- enabled, because the front end determines representations.
1301 if Back_End_Mode
= Declarations_Only
1303 (not (Back_Annotate_Rep_Info
or Generate_SCIL
or GNATprove_Mode
)
1304 or else Main_Kind
= N_Subunit
1305 or else Frontend_Layout_On_Target
)
1307 Post_Compilation_Validation_Checks
;
1308 Errout
.Finalize
(Last_Call
=> True);
1309 Errout
.Output_Messages
;
1310 Write_ALI
(Object
=> False);
1318 -- Ensure that we properly register a dependency on system.ads, since
1319 -- even if we do not semantically depend on this, Targparm has read
1320 -- system parameters from the system.ads file.
1322 Lib
.Writ
.Ensure_System_Dependency
;
1324 -- Add dependencies, if any, on preprocessing data file and on
1325 -- preprocessing definition file(s).
1327 Prepcomp
.Add_Dependencies
;
1329 -- In gnatprove mode we're writing the ALI much earlier than usual
1330 -- as flow analysis needs the file present in order to append its
1331 -- own globals to it.
1333 if GNATprove_Mode
then
1335 -- Note: In GNATprove mode, an "object" file is always generated as
1336 -- the result of calling gnat1 or gnat2why, although this is not the
1337 -- same as the object file produced for compilation.
1339 Write_ALI
(Object
=> True);
1342 -- Some back ends (for instance Gigi) are known to rely on SCOs for code
1343 -- generation. Make sure they are available.
1345 if Generate_SCO
then
1346 Par_SCO
.SCO_Record_Filtered
;
1349 -- Back end needs to explicitly unlock tables it needs to touch
1363 -- Here we call the back end to generate the output code
1365 Generating_Code
:= True;
1366 Back_End
.Call_Back_End
(Back_End_Mode
);
1368 -- Once the backend is complete, we unlock the names table. This call
1369 -- allows a few extra entries, needed for example for the file name
1370 -- for the library file output.
1374 -- Generate the call-graph output of dispatching calls
1376 Exp_CG
.Generate_CG_Output
;
1378 -- Perform post compilation validation checks
1380 Post_Compilation_Validation_Checks
;
1382 -- Now we complete output of errors, rep info and the tree info. These
1383 -- are delayed till now, since it is perfectly possible for gigi to
1384 -- generate errors, modify the tree (in particular by setting flags
1385 -- indicating that elaboration is required, and also to back annotate
1386 -- representation information for List_Rep_Info.
1388 Errout
.Finalize
(Last_Call
=> True);
1389 Errout
.Output_Messages
;
1390 List_Rep_Info
(Ttypes
.Bytes_Big_Endian
);
1391 Inline
.List_Inlining_Info
;
1393 -- Only write the library if the backend did not generate any error
1394 -- messages. Otherwise signal errors to the driver program so that
1395 -- there will be no attempt to generate an object file.
1397 if Compilation_Errors
then
1399 Exit_Program
(E_Errors
);
1402 if not GNATprove_Mode
then
1403 Write_ALI
(Object
=> (Back_End_Mode
= Generate_Object
));
1406 if not Compilation_Errors
then
1408 -- In case of ada backends, we need to make sure that the generated
1409 -- object file has a timestamp greater than the ALI file. We do this
1410 -- to make gnatmake happy when checking the ALI and obj timestamps,
1411 -- where it expects the object file being written after the ali file.
1413 -- Gnatmake's assumption is true for gcc platforms where the gcc
1414 -- wrapper needs to call the assembler after calling gnat1, but is
1415 -- not true for ada backends, where the object files are created
1416 -- directly by gnat1 (so are created before the ali file).
1418 Back_End
.Gen_Or_Update_Object_File
;
1421 -- Generate ASIS tree after writing the ALI file, since in ASIS mode,
1422 -- Write_ALI may in fact result in further tree decoration from the
1423 -- original tree file. Note that we dump the tree just before generating
1424 -- it, so that the dump will exactly reflect what is written out.
1429 -- Finalize name table and we are all done
1434 -- Handle fatal internal compiler errors
1436 when Rtsfind
.RE_Not_Available
=>
1437 Comperr
.Compiler_Abort
("RE_Not_Available");
1439 when System
.Assertions
.Assert_Failure
=>
1440 Comperr
.Compiler_Abort
("Assert_Failure");
1442 when Constraint_Error
=>
1443 Comperr
.Compiler_Abort
("Constraint_Error");
1445 when Program_Error
=>
1446 Comperr
.Compiler_Abort
("Program_Error");
1448 when Storage_Error
=>
1450 -- Assume this is a bug. If it is real, the message will in any case
1451 -- say Storage_Error, giving a strong hint.
1453 Comperr
.Compiler_Abort
("Storage_Error");
1455 when Unrecoverable_Error
=>
1459 Comperr
.Compiler_Abort
("exception");
1465 -- The outer exception handles an unrecoverable error
1468 when Unrecoverable_Error
=>
1469 Errout
.Finalize
(Last_Call
=> True);
1470 Errout
.Output_Messages
;
1473 Write_Str
("compilation abandoned");
1476 Set_Standard_Output
;
1479 Exit_Program
(E_Errors
);