1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2013, 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 Exp_Ch6
; use Exp_Ch6
;
36 with Fname
; use Fname
;
37 with Fname
.UF
; use Fname
.UF
;
39 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
;
73 with Treepr
; use Treepr
;
75 with Types
; use Types
;
76 with Uintp
; use Uintp
;
77 with Uname
; use Uname
;
80 with Validsw
; use Validsw
;
82 with System
.Assertions
;
85 Main_Unit_Node
: Node_Id
;
86 -- Compilation unit node for main unit
88 Main_Kind
: Node_Kind
;
89 -- Kind of main compilation unit node
91 Back_End_Mode
: Back_End
.Back_End_Mode_Type
;
92 -- Record back end mode
94 procedure Adjust_Global_Switches
;
95 -- There are various interactions between front end switch settings,
96 -- including debug switch settings and target dependent parameters.
97 -- This procedure takes care of properly handling these interactions.
98 -- We do it after scanning out all the switches, so that we are not
99 -- depending on the order in which switches appear.
101 procedure Check_Bad_Body
;
102 -- Called to check if the unit we are compiling has a bad body
104 procedure Check_Rep_Info
;
105 -- Called when we are not generating code, to check if -gnatR was requested
106 -- and if so, explain that we will not be honoring the request.
108 ----------------------------
109 -- Adjust_Global_Switches --
110 ----------------------------
112 procedure Adjust_Global_Switches
is
114 -- -gnatd.M enables Relaxed_RM_Semantics
116 if Debug_Flag_Dot_MM
then
117 Relaxed_RM_Semantics
:= True;
120 -- Disable CodePeer_Mode in Check_Syntax, since we need front-end
123 if Operating_Mode
= Check_Syntax
then
124 CodePeer_Mode
:= False;
127 -- Set ASIS mode if -gnatt and -gnatc are set
129 if Operating_Mode
= Check_Semantics
and then Tree_Output
then
132 -- Turn off inlining in ASIS mode, since ASIS cannot handle the extra
133 -- information in the trees caused by inlining being active.
135 -- More specifically, the tree seems to be malformed from the ASIS
136 -- point of view if -gnatc and -gnatn appear together???
138 Inline_Active
:= False;
140 -- Turn off SCIL generation and CodePeer mode in semantics mode,
141 -- since SCIL requires front-end expansion.
143 Generate_SCIL
:= False;
144 CodePeer_Mode
:= False;
147 -- SCIL mode needs to disable front-end inlining since the generated
148 -- trees (in particular order and consistency between specs compiled
149 -- as part of a main unit or as part of a with-clause) are causing
152 if Generate_SCIL
then
153 Front_End_Inlining
:= False;
156 -- Tune settings for optimal SCIL generation in CodePeer mode
158 if CodePeer_Mode
then
160 -- Turn off inlining, confuses CodePeer output and gains nothing
162 Front_End_Inlining
:= False;
163 Inline_Active
:= False;
165 -- Disable front-end optimizations, to keep the tree as close to the
166 -- source code as possible, and also to avoid inconsistencies between
167 -- trees when using different optimization switches.
169 Optimization_Level
:= 0;
171 -- Enable some restrictions systematically to simplify the generated
172 -- code (and ease analysis). Note that restriction checks are also
173 -- disabled in CodePeer mode, see Restrict.Check_Restriction, and
174 -- user specified Restrictions pragmas are ignored, see
175 -- Sem_Prag.Process_Restrictions_Or_Restriction_Warnings.
177 Restrict
.Restrictions
.Set
(No_Initialize_Scalars
) := True;
178 Restrict
.Restrictions
.Set
(No_Task_Hierarchy
) := True;
179 Restrict
.Restrictions
.Set
(No_Abort_Statements
) := True;
180 Restrict
.Restrictions
.Set
(Max_Asynchronous_Select_Nesting
) := True;
181 Restrict
.Restrictions
.Value
(Max_Asynchronous_Select_Nesting
) := 0;
183 -- Suppress division by zero and access checks since they are handled
184 -- implicitly by CodePeer.
186 -- Turn off dynamic elaboration checks: generates inconsistencies in
187 -- trees between specs compiled as part of a main unit or as part of
190 -- Turn off alignment checks: these cannot be proved statically by
191 -- CodePeer and generate false positives.
193 -- Enable all other language checks
195 Suppress_Options
.Suppress
:=
196 (Access_Check
=> True,
197 Alignment_Check
=> True,
198 Division_Check
=> True,
199 Elaboration_Check
=> True,
202 Dynamic_Elaboration_Checks
:= False;
204 -- Set STRICT mode for overflow checks if not set explicitly. This
205 -- prevents suppressing of overflow checks by default, in code down
208 if Suppress_Options
.Overflow_Mode_General
= Not_Set
then
209 Suppress_Options
.Overflow_Mode_General
:= Strict
;
210 Suppress_Options
.Overflow_Mode_Assertions
:= Strict
;
213 -- CodePeer handles division and overflow checks directly, based on
214 -- the marks set by the frontend, hence no special expansion should
215 -- be performed in the frontend for division and overflow checks.
217 Backend_Divide_Checks_On_Target
:= True;
218 Backend_Overflow_Checks_On_Target
:= True;
220 -- Kill debug of generated code, since it messes up sloc values
222 Debug_Generated_Code
:= False;
224 -- Turn cross-referencing on in case it was disabled (e.g. by -gnatD)
225 -- Do we really need to spend time generating xref in CodePeer
226 -- mode??? Consider setting Xref_Active to False.
230 -- Polling mode forced off, since it generates confusing junk
232 Polling_Required
:= False;
234 -- Set operating mode to Generate_Code to benefit from full front-end
235 -- expansion (e.g. generics).
237 Operating_Mode
:= Generate_Code
;
239 -- We need SCIL generation of course
241 Generate_SCIL
:= True;
243 -- Enable assertions, since they give CodePeer valuable extra info
245 Assertions_Enabled
:= True;
247 -- Disable all simple value propagation. This is an optimization
248 -- which is valuable for code optimization, and also for generation
249 -- of compiler warnings, but these are being turned off by default,
250 -- and CodePeer generates better messages (referencing original
251 -- variables) this way.
253 Debug_Flag_MM
:= True;
255 -- Set normal RM validity checking, and checking of IN OUT parameters
256 -- (this might give CodePeer more useful checks to analyze, to be
257 -- confirmed???). All other validity checking is turned off, since
258 -- this can generate very complex trees that only confuse CodePeer
259 -- and do not bring enough useful info.
261 Reset_Validity_Check_Options
;
262 Validity_Check_Default
:= True;
263 Validity_Check_In_Out_Params
:= True;
264 Validity_Check_In_Params
:= True;
266 -- Turn off style check options since we are not interested in any
267 -- front-end warnings when we are getting CodePeer output.
269 Reset_Style_Check_Options
;
271 -- Always perform semantics and generate ali files in CodePeer mode,
272 -- so that a gnatmake -c -k will proceed further when possible.
274 Force_ALI_Tree_File
:= True;
275 Try_Semantics
:= True;
277 -- Make the Ada front-end more liberal so that the compiler will
278 -- allow illegal code that is allowed by other compilers. CodePeer
279 -- is in the business of finding problems, not enforcing rules!
280 -- This is useful when using CodePeer mode with other compilers.
282 Relaxed_RM_Semantics
:= True;
285 if Relaxed_RM_Semantics
then
286 Overriding_Renamings
:= True;
289 -- Set switches for formal verification mode
291 if Debug_Flag_Dot_VV
then
292 Formal_Extensions
:= True;
295 -- Enable SPARK_Mode when using -gnatd.F switch
297 if Debug_Flag_Dot_FF
then
301 -- SPARK_Mode is also activated by default in the gnat2why executable
305 -- Set strict standard interpretation of compiler permissions
307 if Debug_Flag_Dot_DD
then
308 SPARK_Strict_Mode
:= True;
311 -- Distinguish between the two modes of gnat2why: frame condition
312 -- generation (generation of ALI files) and translation of Why (no
313 -- ALI files generated). This is done with the switch -gnatd.G,
314 -- which activates frame condition mode. The other changes in
315 -- behavior depending on this switch are done in gnat2why directly.
317 if Debug_Flag_Dot_GG
then
318 Frame_Condition_Mode
:= True;
320 Opt
.Disable_ALI_File
:= True;
323 -- Turn off inlining, which would confuse formal verification output
326 Front_End_Inlining
:= False;
327 Inline_Active
:= False;
329 -- Disable front-end optimizations, to keep the tree as close to the
330 -- source code as possible, and also to avoid inconsistencies between
331 -- trees when using different optimization switches.
333 Optimization_Level
:= 0;
335 -- Enable some restrictions systematically to simplify the generated
336 -- code (and ease analysis). Note that restriction checks are also
337 -- disabled in SPARK mode, see Restrict.Check_Restriction, and user
338 -- specified Restrictions pragmas are ignored, see
339 -- Sem_Prag.Process_Restrictions_Or_Restriction_Warnings.
341 Restrict
.Restrictions
.Set
(No_Initialize_Scalars
) := True;
343 -- Note: at this point we used to suppress various checks, but that
344 -- is not what we want. We need the semantic processing for these
345 -- checks (which will set flags like Do_Overflow_Check, showing the
346 -- points at which potential checks are required semantically). We
347 -- don't want the expansion associated with these checks, but that
348 -- happens anyway because this expansion is simply not done in the
349 -- SPARK version of the expander.
351 -- Turn off dynamic elaboration checks: generates inconsistencies in
352 -- trees between specs compiled as part of a main unit or as part of
355 Dynamic_Elaboration_Checks
:= False;
357 -- Set STRICT mode for overflow checks if not set explicitly. This
358 -- prevents suppressing of overflow checks by default, in code down
361 if Suppress_Options
.Overflow_Mode_General
= Not_Set
then
362 Suppress_Options
.Overflow_Mode_General
:= Strict
;
363 Suppress_Options
.Overflow_Mode_Assertions
:= Strict
;
366 -- Kill debug of generated code, since it messes up sloc values
368 Debug_Generated_Code
:= False;
370 -- Turn cross-referencing on in case it was disabled (e.g. by -gnatD)
371 -- as it is needed for computing effects of subprograms in the formal
372 -- verification backend.
376 -- Polling mode forced off, since it generates confusing junk
378 Polling_Required
:= False;
380 -- Set operating mode to Generate_Code, but full front-end expansion
381 -- is not desirable in SPARK mode, so a light expansion is performed
384 Operating_Mode
:= Generate_Code
;
388 Debug_Flag_HH
:= True;
390 -- Enable assertions, since they give valuable extra information for
391 -- formal verification.
393 Assertions_Enabled
:= True;
395 -- Turn off style check options since we are not interested in any
396 -- front-end warnings when we are getting SPARK output.
398 Reset_Style_Check_Options
;
400 -- Suppress compiler warnings, since what we are interested in here
401 -- is what formal verification can find out.
403 Warning_Mode
:= Suppress
;
405 -- Suppress the generation of name tables for enumerations, which are
406 -- not needed for formal verification, and fall outside the SPARK
407 -- subset (use of pointers).
409 Global_Discard_Names
:= True;
411 -- Suppress the expansion of tagged types and dispatching calls,
412 -- which lead to the generation of non-SPARK code (use of pointers),
413 -- which is more complex to formally verify than the original source.
415 Tagged_Type_Expansion
:= False;
419 -- Set Configurable_Run_Time mode if system.ads flag set
421 if Targparm
.Configurable_Run_Time_On_Target
or Debug_Flag_YY
then
422 Configurable_Run_Time_Mode
:= True;
425 -- Set -gnatR3m mode if debug flag A set
427 if Debug_Flag_AA
then
428 Back_Annotate_Rep_Info
:= True;
429 List_Representation_Info
:= 1;
430 List_Representation_Info_Mechanisms
:= True;
433 -- Force Target_Strict_Alignment true if debug flag -gnatd.a is set
435 if Debug_Flag_Dot_A
then
436 Ttypes
.Target_Strict_Alignment
:= True;
439 -- Increase size of allocated entities if debug flag -gnatd.N is set
441 if Debug_Flag_Dot_NN
then
442 Atree
.Num_Extension_Nodes
:= Atree
.Num_Extension_Nodes
+ 1;
445 -- Disable static allocation of dispatch tables if -gnatd.t or if layout
446 -- is enabled. The front end's layout phase currently treats types that
447 -- have discriminant-dependent arrays as not being static even when a
448 -- discriminant constraint on the type is static, and this leads to
449 -- problems with subtypes of type Ada.Tags.Dispatch_Table_Wrapper. ???
451 if Debug_Flag_Dot_T
or else Frontend_Layout_On_Target
then
452 Static_Dispatch_Tables
:= False;
455 -- Flip endian mode if -gnatd8 set
458 Ttypes
.Bytes_Big_Endian
:= not Ttypes
.Bytes_Big_Endian
;
461 -- Deal with forcing OpenVMS switches True if debug flag M is set, but
462 -- record the setting of Targparm.Open_VMS_On_Target in True_VMS_Target
463 -- before doing this, so we know if we are in real OpenVMS or not!
465 Opt
.True_VMS_Target
:= Targparm
.OpenVMS_On_Target
;
468 Targparm
.OpenVMS_On_Target
:= True;
469 Hostparm
.OpenVMS
:= True;
472 -- Activate front end layout if debug flag -gnatdF is set
474 if Debug_Flag_FF
then
475 Targparm
.Frontend_Layout_On_Target
:= True;
478 -- Set and check exception mechanism
480 if Targparm
.ZCX_By_Default_On_Target
then
481 Exception_Mechanism
:= Back_End_Exceptions
;
484 -- Set proper status for overflow check mechanism
486 -- If already set (by -gnato or above in SPARK or CodePeer mode) then we
487 -- have nothing to do.
489 if Opt
.Suppress_Options
.Overflow_Mode_General
/= Not_Set
then
492 -- Otherwise set overflow mode defaults
495 -- Otherwise set overflow checks off by default
497 Suppress_Options
.Suppress
(Overflow_Check
) := True;
499 -- Set appropriate default overflow handling mode. Note: at present
500 -- we set STRICT in all three of the following cases. They are
501 -- separated because in the future we may make different choices.
503 -- By default set STRICT mode if -gnatg in effect
506 Suppress_Options
.Overflow_Mode_General
:= Strict
;
507 Suppress_Options
.Overflow_Mode_Assertions
:= Strict
;
509 -- If we have backend divide and overflow checks, then by default
510 -- overflow checks are STRICT. Historically this code used to also
511 -- activate overflow checks, although no target currently has these
512 -- flags set, so this was dead code anyway.
514 elsif Targparm
.Backend_Divide_Checks_On_Target
516 Targparm
.Backend_Overflow_Checks_On_Target
518 Suppress_Options
.Overflow_Mode_General
:= Strict
;
519 Suppress_Options
.Overflow_Mode_Assertions
:= Strict
;
521 -- Otherwise for now, default is STRICT mode. This may change in the
522 -- future, but for now this is the compatible behavior with previous
526 Suppress_Options
.Overflow_Mode_General
:= Strict
;
527 Suppress_Options
.Overflow_Mode_Assertions
:= Strict
;
531 -- Set default for atomic synchronization. As this synchronization
532 -- between atomic accesses can be expensive, and not typically needed
533 -- on some targets, an optional target parameter can turn the option
534 -- off. Note Atomic Synchronization is implemented as check.
536 Suppress_Options
.Suppress
(Atomic_Synchronization
) :=
537 not Atomic_Sync_Default_On_Target
;
539 -- Set switch indicating if back end can handle limited types, and
540 -- guarantee that no incorrect copies are made (e.g. in the context
541 -- of an if or case expression).
543 -- Debug flag -gnatd.L decisively sets usage on
545 if Debug_Flag_Dot_LL
then
546 Back_End_Handles_Limited_Types
:= True;
548 -- If no debug flag, usage off for AAMP, VM, SCIL cases
551 or else VM_Target
/= No_VM
552 or else Generate_SCIL
554 Back_End_Handles_Limited_Types
:= False;
556 -- Otherwise normal gcc back end, for now still turn flag off by
557 -- default, since there are unresolved problems in the front end.
560 Back_End_Handles_Limited_Types
:= False;
563 -- If the inlining level has not been set by the user, compute it from
564 -- the optimization level: 1 at -O1/-O2 (and -Os), 2 at -O3 and above.
566 if Inline_Level
= 0 then
567 if Optimization_Level
< 3 then
574 -- Finally capture adjusted value of Suppress_Options as the initial
575 -- value for Scope_Suppress, which will be modified as we move from
576 -- scope to scope (by Suppress/Unsuppress/Overflow_Checks pragmas).
578 Sem
.Scope_Suppress
:= Opt
.Suppress_Options
;
579 end Adjust_Global_Switches
;
585 procedure Check_Bad_Body
is
586 Sname
: Unit_Name_Type
;
587 Src_Ind
: Source_File_Index
;
588 Fname
: File_Name_Type
;
590 procedure Bad_Body_Error
(Msg
: String);
591 -- Issue message for bad body found
597 procedure Bad_Body_Error
(Msg
: String) is
599 Error_Msg_N
(Msg
, Main_Unit_Node
);
600 Error_Msg_File_1
:= Fname
;
601 Error_Msg_N
("remove incorrect body in file{!", Main_Unit_Node
);
604 -- Start of processing for Check_Bad_Body
607 -- Nothing to do if we are only checking syntax, because we don't know
608 -- enough to know if we require or forbid a body in this case.
610 if Operating_Mode
= Check_Syntax
then
614 -- Check for body not allowed
616 if (Main_Kind
= N_Package_Declaration
617 and then not Body_Required
(Main_Unit_Node
))
618 or else (Main_Kind
= N_Generic_Package_Declaration
619 and then not Body_Required
(Main_Unit_Node
))
620 or else Main_Kind
= N_Package_Renaming_Declaration
621 or else Main_Kind
= N_Subprogram_Renaming_Declaration
622 or else Nkind
(Original_Node
(Unit
(Main_Unit_Node
)))
623 in N_Generic_Instantiation
625 Sname
:= Unit_Name
(Main_Unit
);
627 -- If we do not already have a body name, then get the body name
628 -- (but how can we have a body name here???)
630 if not Is_Body_Name
(Sname
) then
631 Sname
:= Get_Body_Name
(Sname
);
634 Fname
:= Get_File_Name
(Sname
, Subunit
=> False);
635 Src_Ind
:= Load_Source_File
(Fname
);
637 -- Case where body is present and it is not a subunit. Exclude the
638 -- subunit case, because it has nothing to do with the package we are
639 -- compiling. It is illegal for a child unit and a subunit with the
640 -- same expanded name (RM 10.2(9)) to appear together in a partition,
641 -- but there is nothing to stop a compilation environment from having
642 -- both, and the test here simply allows that. If there is an attempt
643 -- to include both in a partition, this is diagnosed at bind time. In
644 -- Ada 83 mode this is not a warning case.
646 -- Note: if weird file names are being used, we can have a situation
647 -- where the file name that supposedly contains body in fact contains
648 -- a spec, or we can't tell what it contains. Skip the error message
651 -- Also ignore body that is nothing but pragma No_Body; (that's the
652 -- whole point of this pragma, to be used this way and to cause the
653 -- body file to be ignored in this context).
655 if Src_Ind
/= No_Source_File
656 and then Get_Expected_Unit_Type
(Fname
) = Expect_Body
657 and then not Source_File_Is_Subunit
(Src_Ind
)
658 and then not Source_File_Is_No_Body
(Src_Ind
)
660 Errout
.Finalize
(Last_Call
=> False);
662 Error_Msg_Unit_1
:= Sname
;
664 -- Ada 83 case of a package body being ignored. This is not an
665 -- error as far as the Ada 83 RM is concerned, but it is almost
666 -- certainly not what is wanted so output a warning. Give this
667 -- message only if there were no errors, since otherwise it may
668 -- be incorrect (we may have misinterpreted a junk spec as not
669 -- needing a body when it really does).
671 if Main_Kind
= N_Package_Declaration
672 and then Ada_Version
= Ada_83
673 and then Operating_Mode
= Generate_Code
674 and then Distribution_Stub_Mode
/= Generate_Caller_Stub_Body
675 and then not Compilation_Errors
678 ("package $$ does not require a body??", Main_Unit_Node
);
679 Error_Msg_File_1
:= Fname
;
680 Error_Msg_N
("body in file{ will be ignored??", Main_Unit_Node
);
682 -- Ada 95 cases of a body file present when no body is
683 -- permitted. This we consider to be an error.
686 -- For generic instantiations, we never allow a body
688 if Nkind
(Original_Node
(Unit
(Main_Unit_Node
)))
689 in N_Generic_Instantiation
692 ("generic instantiation for $$ does not allow a body");
694 -- A library unit that is a renaming never allows a body
696 elsif Main_Kind
in N_Renaming_Declaration
then
698 ("renaming declaration for $$ does not allow a body!");
700 -- Remaining cases are packages and generic packages. Here
701 -- we only do the test if there are no previous errors,
702 -- because if there are errors, they may lead us to
703 -- incorrectly believe that a package does not allow a body
704 -- when in fact it does.
706 elsif not Compilation_Errors
then
707 if Main_Kind
= N_Package_Declaration
then
709 ("package $$ does not allow a body!");
711 elsif Main_Kind
= N_Generic_Package_Declaration
then
713 ("generic package $$ does not allow a body!");
726 procedure Check_Rep_Info
is
728 if List_Representation_Info
/= 0
729 or else List_Representation_Info_Mechanisms
734 ("cannot generate representation information, no code generated");
741 -- Start of processing for Gnat1drv
744 -- This inner block is set up to catch assertion errors and constraint
745 -- errors. Since the code for handling these errors can cause another
746 -- exception to be raised (namely Unrecoverable_Error), we need two
747 -- nested blocks, so that the outer one handles unrecoverable error.
750 -- Initialize all packages. For the most part, these initialization
751 -- calls can be made in any order. Exceptions are as follows:
753 -- Lib.Initialize need to be called before Scan_Compiler_Arguments,
754 -- because it initializes a table filled by Scan_Compiler_Arguments.
760 Scan_Compiler_Arguments
;
761 Osint
.Add_Default_Search_Dirs
;
781 Sem_Type
.Init_Interp_Tables
;
783 -- Acquire target parameters from system.ads (source of package System)
788 S
: Source_File_Index
;
792 Name_Buffer
(1 .. 10) := "system.ads";
795 S
:= Load_Source_File
(N
);
797 if S
= No_Source_File
then
799 ("fatal error, run-time library not installed correctly");
800 Write_Line
("cannot locate file system.ads");
801 raise Unrecoverable_Error
;
803 -- Remember source index of system.ads (which was read successfully)
806 System_Source_File_Index
:= S
;
809 Targparm
.Get_Target_Parameters
810 (System_Text
=> Source_Text
(S
),
811 Source_First
=> Source_First
(S
),
812 Source_Last
=> Source_Last
(S
));
814 -- Acquire configuration pragma information from Targparm
816 Restrict
.Restrictions
:= Targparm
.Restrictions_On_Target
;
819 Adjust_Global_Switches
;
821 -- Output copyright notice if full list mode unless we have a list
822 -- file, in which case we defer this so that it is output in the file
824 if (Verbose_Mode
or else (Full_List
and then Full_List_File_Name
= null))
825 and then not Debug_Flag_7
829 Write_Str
(Gnat_Version_String
);
831 Write_Str
("Copyright 1992-" & Current_Year
832 & ", Free Software Foundation, Inc.");
836 -- Check we do not have more than one source file, this happens only in
837 -- the case where the driver is called directly, it cannot happen when
838 -- gnat1 is invoked from gcc in the normal case.
840 if Osint
.Number_Of_Files
/= 1 then
843 Osint
.Fail
("you must provide one source file");
845 elsif Usage_Requested
then
849 -- Generate target dependent output file if requested
851 if Target_Dependent_Info_Write_Name
/= null then
852 Set_Targ
.Write_Target_Dependent_Values
;
855 -- Call the front end
857 Original_Operating_Mode
:= Operating_Mode
;
860 -- Exit with errors if the main source could not be parsed. Also, when
861 -- -gnatd.H is present, the source file is not set.
863 if Sinput
.Main_Source_File
= No_Source_File
then
865 -- Handle -gnatd.H debug mode
867 if Debug_Flag_Dot_HH
then
869 -- For -gnatd.H, lock all the tables to keep the convention that
870 -- the backend needs to unlock the tables it wants to touch.
883 -- And all we need to do is to call the back end
885 Back_End
.Call_Back_End
(Back_End
.Generate_Object
);
888 Errout
.Finalize
(Last_Call
=> True);
889 Errout
.Output_Messages
;
890 Exit_Program
(E_Errors
);
893 Main_Unit_Node
:= Cunit
(Main_Unit
);
894 Main_Kind
:= Nkind
(Unit
(Main_Unit_Node
));
897 -- In CodePeer mode we always delete old SCIL files before regenerating
898 -- new ones, in case of e.g. errors, and also to remove obsolete scilx
899 -- files generated by CodePeer itself.
901 if CodePeer_Mode
then
902 Comperr
.Delete_SCIL_Files
;
905 -- Exit if compilation errors detected
907 Errout
.Finalize
(Last_Call
=> False);
909 if Compilation_Errors
then
911 Sem_Ch13
.Validate_Unchecked_Conversions
;
912 Sem_Ch13
.Validate_Address_Clauses
;
913 Sem_Ch13
.Validate_Independence
;
914 Errout
.Output_Messages
;
917 -- Generate ALI file if specially requested
919 if Opt
.Force_ALI_Tree_File
then
920 Write_ALI
(Object
=> False);
924 Errout
.Finalize
(Last_Call
=> True);
925 Exit_Program
(E_Errors
);
928 -- Set Generate_Code on main unit and its spec. We do this even if are
929 -- not generating code, since Lib-Writ uses this to determine which
930 -- units get written in the ali file.
932 Set_Generate_Code
(Main_Unit
);
934 -- If we have a corresponding spec, and it comes from source or it is
935 -- not a generated spec for a child subprogram body, then we need object
936 -- code for the spec unit as well.
938 if Nkind
(Unit
(Main_Unit_Node
)) in N_Unit_Body
939 and then not Acts_As_Spec
(Main_Unit_Node
)
941 if Nkind
(Unit
(Main_Unit_Node
)) = N_Subprogram_Body
942 and then not Comes_From_Source
(Library_Unit
(Main_Unit_Node
))
947 (Get_Cunit_Unit_Number
(Library_Unit
(Main_Unit_Node
)));
951 -- Case of no code required to be generated, exit indicating no error
953 if Original_Operating_Mode
= Check_Syntax
then
955 Errout
.Finalize
(Last_Call
=> True);
956 Errout
.Output_Messages
;
961 -- Use a goto instead of calling Exit_Program so that finalization
966 elsif Original_Operating_Mode
= Check_Semantics
then
967 Back_End_Mode
:= Declarations_Only
;
969 -- All remaining cases are cases in which the user requested that code
970 -- be generated (i.e. no -gnatc or -gnats switch was used). Check if we
971 -- can in fact satisfy this request.
973 -- Cannot generate code if someone has turned off code generation for
974 -- any reason at all. We will try to figure out a reason below.
976 elsif Operating_Mode
/= Generate_Code
then
977 Back_End_Mode
:= Skip
;
979 -- We can generate code for a subprogram body unless there were missing
980 -- subunits. Note that we always generate code for all generic units (a
981 -- change from some previous versions of GNAT).
983 elsif Main_Kind
= N_Subprogram_Body
and then not Subunits_Missing
then
984 Back_End_Mode
:= Generate_Object
;
986 -- We can generate code for a package body unless there are subunits
987 -- missing (note that we always generate code for generic units, which
988 -- is a change from some earlier versions of GNAT).
990 elsif Main_Kind
= N_Package_Body
and then not Subunits_Missing
then
991 Back_End_Mode
:= Generate_Object
;
993 -- We can generate code for a package declaration or a subprogram
994 -- declaration only if it does not required a body.
996 elsif Nkind_In
(Main_Kind
,
997 N_Package_Declaration
,
998 N_Subprogram_Declaration
)
1000 (not Body_Required
(Main_Unit_Node
)
1002 Distribution_Stub_Mode
= Generate_Caller_Stub_Body
)
1004 Back_End_Mode
:= Generate_Object
;
1006 -- We can generate code for a generic package declaration of a generic
1007 -- subprogram declaration only if does not require a body.
1009 elsif Nkind_In
(Main_Kind
, N_Generic_Package_Declaration
,
1010 N_Generic_Subprogram_Declaration
)
1011 and then not Body_Required
(Main_Unit_Node
)
1013 Back_End_Mode
:= Generate_Object
;
1015 -- Compilation units that are renamings do not require bodies, so we can
1016 -- generate code for them.
1018 elsif Nkind_In
(Main_Kind
, N_Package_Renaming_Declaration
,
1019 N_Subprogram_Renaming_Declaration
)
1021 Back_End_Mode
:= Generate_Object
;
1023 -- Compilation units that are generic renamings do not require bodies
1024 -- so we can generate code for them.
1026 elsif Main_Kind
in N_Generic_Renaming_Declaration
then
1027 Back_End_Mode
:= Generate_Object
;
1029 -- It is not an error to analyze in CodePeer mode a spec which requires
1030 -- a body, in order to generate SCIL for this spec.
1032 elsif CodePeer_Mode
then
1033 Back_End_Mode
:= Generate_Object
;
1035 -- It is not an error to analyze in SPARK mode a spec which requires a
1036 -- body, when the body is not available. During frame condition
1037 -- generation, the corresponding ALI file is generated. During
1038 -- translation to Why, Why code is generated for the spec.
1040 elsif SPARK_Mode
then
1041 if Frame_Condition_Mode
then
1042 Back_End_Mode
:= Declarations_Only
;
1044 Back_End_Mode
:= Generate_Object
;
1047 -- In all other cases (specs which have bodies, generics, and bodies
1048 -- where subunits are missing), we cannot generate code and we generate
1049 -- a warning message. Note that generic instantiations are gone at this
1050 -- stage since they have been replaced by their instances.
1053 Back_End_Mode
:= Skip
;
1056 -- At this stage Back_End_Mode is set to indicate if the backend should
1057 -- be called to generate code. If it is Skip, then code generation has
1058 -- been turned off, even though code was requested by the original
1059 -- command. This is not an error from the user point of view, but it is
1060 -- an error from the point of view of the gcc driver, so we must exit
1061 -- with an error status.
1063 -- We generate an informative message (from the gcc point of view, it
1064 -- is an error message, but from the users point of view this is not an
1065 -- error, just a consequence of compiling something that cannot
1068 if Back_End_Mode
= Skip
then
1070 Write_Str
("cannot generate code for ");
1071 Write_Str
("file ");
1072 Write_Name
(Unit_File_Name
(Main_Unit
));
1074 if Subunits_Missing
then
1075 Write_Str
(" (missing subunits)");
1078 -- Force generation of ALI file, for backward compatibility
1080 Opt
.Force_ALI_Tree_File
:= True;
1082 elsif Main_Kind
= N_Subunit
then
1083 Write_Str
(" (subunit)");
1086 -- Force generation of ALI file, for backward compatibility
1088 Opt
.Force_ALI_Tree_File
:= True;
1090 elsif Main_Kind
= N_Subprogram_Declaration
then
1091 Write_Str
(" (subprogram spec)");
1094 -- Generic package body in GNAT implementation mode
1096 elsif Main_Kind
= N_Package_Body
and then GNAT_Mode
then
1097 Write_Str
(" (predefined generic)");
1100 -- Force generation of ALI file, for backward compatibility
1102 Opt
.Force_ALI_Tree_File
:= True;
1104 -- Only other case is a package spec
1107 Write_Str
(" (package spec)");
1111 Set_Standard_Output
;
1113 Sem_Ch13
.Validate_Unchecked_Conversions
;
1114 Sem_Ch13
.Validate_Address_Clauses
;
1115 Sem_Ch13
.Validate_Independence
;
1116 Errout
.Finalize
(Last_Call
=> True);
1117 Errout
.Output_Messages
;
1121 -- Generate ALI file if specially requested, or for missing subunits,
1122 -- subunits or predefined generic.
1124 if Opt
.Force_ALI_Tree_File
then
1125 Write_ALI
(Object
=> False);
1131 -- Exit program with error indication, to kill object file
1133 Exit_Program
(E_No_Code
);
1136 -- In -gnatc mode, we only do annotation if -gnatt or -gnatR is also set
1137 -- as indicated by Back_Annotate_Rep_Info being set to True.
1139 -- We don't call for annotations on a subunit, because to process those
1140 -- the back-end requires that the parent(s) be properly compiled.
1142 -- Annotation is suppressed for targets where front-end layout is
1143 -- enabled, because the front end determines representations.
1145 -- Annotation is also suppressed in the case of compiling for a VM,
1146 -- since representations are largely symbolic there.
1148 if Back_End_Mode
= Declarations_Only
1149 and then (not (Back_Annotate_Rep_Info
or Generate_SCIL
)
1150 or else Main_Kind
= N_Subunit
1151 or else Targparm
.Frontend_Layout_On_Target
1152 or else Targparm
.VM_Target
/= No_VM
)
1154 Sem_Ch13
.Validate_Unchecked_Conversions
;
1155 Sem_Ch13
.Validate_Address_Clauses
;
1156 Sem_Ch13
.Validate_Independence
;
1157 Errout
.Finalize
(Last_Call
=> True);
1158 Errout
.Output_Messages
;
1159 Write_ALI
(Object
=> False);
1167 -- Ensure that we properly register a dependency on system.ads, since
1168 -- even if we do not semantically depend on this, Targparm has read
1169 -- system parameters from the system.ads file.
1171 Lib
.Writ
.Ensure_System_Dependency
;
1173 -- Add dependencies, if any, on preprocessing data file and on
1174 -- preprocessing definition file(s).
1176 Prepcomp
.Add_Dependencies
;
1178 -- Back end needs to explicitly unlock tables it needs to touch
1191 -- Here we call the back end to generate the output code
1193 Generating_Code
:= True;
1194 Back_End
.Call_Back_End
(Back_End_Mode
);
1196 -- Once the backend is complete, we unlock the names table. This call
1197 -- allows a few extra entries, needed for example for the file name for
1198 -- the library file output.
1202 -- Generate the call-graph output of dispatching calls
1204 Exp_CG
.Generate_CG_Output
;
1206 -- Validate unchecked conversions (using the values for size and
1207 -- alignment annotated by the backend where possible).
1209 Sem_Ch13
.Validate_Unchecked_Conversions
;
1211 -- Validate address clauses (again using alignment values annotated
1212 -- by the backend where possible).
1214 Sem_Ch13
.Validate_Address_Clauses
;
1216 -- Validate independence pragmas (again using values annotated by
1217 -- the back end for component layout etc.)
1219 Sem_Ch13
.Validate_Independence
;
1221 -- Now we complete output of errors, rep info and the tree info. These
1222 -- are delayed till now, since it is perfectly possible for gigi to
1223 -- generate errors, modify the tree (in particular by setting flags
1224 -- indicating that elaboration is required, and also to back annotate
1225 -- representation information for List_Rep_Info.
1227 Errout
.Finalize
(Last_Call
=> True);
1228 Errout
.Output_Messages
;
1229 List_Rep_Info
(Ttypes
.Bytes_Big_Endian
);
1232 -- Only write the library if the backend did not generate any error
1233 -- messages. Otherwise signal errors to the driver program so that
1234 -- there will be no attempt to generate an object file.
1236 if Compilation_Errors
then
1238 Exit_Program
(E_Errors
);
1241 Write_ALI
(Object
=> (Back_End_Mode
= Generate_Object
));
1243 if not Compilation_Errors
then
1245 -- In case of ada backends, we need to make sure that the generated
1246 -- object file has a timestamp greater than the ALI file. We do this
1247 -- to make gnatmake happy when checking the ALI and obj timestamps,
1248 -- where it expects the object file being written after the ali file.
1250 -- Gnatmake's assumption is true for gcc platforms where the gcc
1251 -- wrapper needs to call the assembler after calling gnat1, but is
1252 -- not true for ada backends, where the object files are created
1253 -- directly by gnat1 (so are created before the ali file).
1255 Back_End
.Gen_Or_Update_Object_File
;
1258 -- Generate ASIS tree after writing the ALI file, since in ASIS mode,
1259 -- Write_ALI may in fact result in further tree decoration from the
1260 -- original tree file. Note that we dump the tree just before generating
1261 -- it, so that the dump will exactly reflect what is written out.
1266 -- Finalize name table and we are all done
1271 -- Handle fatal internal compiler errors
1273 when Rtsfind
.RE_Not_Available
=>
1274 Comperr
.Compiler_Abort
("RE_Not_Available");
1276 when System
.Assertions
.Assert_Failure
=>
1277 Comperr
.Compiler_Abort
("Assert_Failure");
1279 when Constraint_Error
=>
1280 Comperr
.Compiler_Abort
("Constraint_Error");
1282 when Program_Error
=>
1283 Comperr
.Compiler_Abort
("Program_Error");
1285 when Storage_Error
=>
1287 -- Assume this is a bug. If it is real, the message will in any case
1288 -- say Storage_Error, giving a strong hint!
1290 Comperr
.Compiler_Abort
("Storage_Error");
1296 -- The outer exception handles an unrecoverable error
1299 when Unrecoverable_Error
=>
1300 Errout
.Finalize
(Last_Call
=> True);
1301 Errout
.Output_Messages
;
1304 Write_Str
("compilation abandoned");
1307 Set_Standard_Output
;
1310 Exit_Program
(E_Errors
);