1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2011, 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. --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
30 ------------------------------------------------------------------------------
32 -- This package contains global flags set by the initialization routine from
33 -- the command line and referenced throughout the compiler, the binder, or
34 -- other GNAT tools. The comments indicate which options are used by which
35 -- programs (GNAT, GNATBIND, GNATLINK, GNATMAKE, GPRMAKE, etc).
37 -- Some flags are labelled "PROJECT MANAGER". These are used by tools that
38 -- use the Project Manager. These tools include gnatmake, gnatname, the gnat
39 -- driver, gnatclean, gprbuild and gprclean.
41 with Hostparm; use Hostparm;
42 with Types; use Types;
44 pragma Warnings (Off);
45 -- This package is used also by gnatcoll
46 with System.Strings; use System.Strings;
47 with System.WCh_Con; use System.WCh_Con;
52 ----------------------
53 -- Checksum Control --
54 ----------------------
56 -- Checksums are computed for sources to check for sources being the same
57 -- from a compilation point of view (e.g. spelling of identifiers and
58 -- white space layout do not count in this computation).
60 -- The way the checksum is computed has evolved across the various versions
61 -- of GNAT. When gprbuild is called with -m, the checksums must be computed
62 -- the same way in gprbuild as it was in the GNAT version of the compiler.
63 -- The different ways are
65 -- Version 6.4 and later:
67 -- The Accumulate_Token_Checksum procedure is called after each numeric
68 -- literal and each identifier/keyword. For keywords, Tok_Identifier is
69 -- used in the call to Accumulate_Token_Checksum.
71 -- Versions 5.04 to 6.3:
73 -- For keywords, the token value were used in the call to procedure
74 -- Accumulate_Token_Checksum. Type Token_Type did not include Tok_Some.
78 -- For keywords, the token value were used in the call to
79 -- Accumulate_Token_Checksum. Type Token_Type did not include
80 -- Tok_Interface, Tok_Overriding, Tok_Synchronized and Tok_Some.
82 -- Versions 5.02 and before:
84 -- No calls to procedure Accumulate_Token_Checksum (the checksum
85 -- mechanism was introduced in version 5.03).
87 -- To signal to the scanner whether Accumulate_Token_Checksum needs to be
88 -- called and what versions to call, the following Boolean flags are used:
90 Checksum_Accumulate_Token_Checksum : Boolean := True;
92 -- Set to False by gprbuild when the version of GNAT is 5.02 or before. If
93 -- this switch is False, then we do not call Accumulate_Token_Checksum, so
94 -- the setting of the following two flags is irrelevant.
96 Checksum_GNAT_6_3 : Boolean := False;
98 -- Set to True by gprbuild when the version of GNAT is 6.3 or before.
100 Checksum_GNAT_5_03 : Boolean := False;
102 -- Set to True by gprbuild when the version of GNAT is 5.03 or before.
104 ----------------------------------------------
105 -- Settings of Modes for Current Processing --
106 ----------------------------------------------
108 -- The following mode values represent the current state of processing.
109 -- The values set here are the default values. Unless otherwise noted,
110 -- the value may be reset in Switch-? with an appropriate switch. In
111 -- some cases, the values can also be modified by pragmas, and in the
112 -- case of some binder variables, Gnatbind.Scan_Bind_Arg may modify
113 -- the default values.
115 type Ada_Version_Type is (Ada_83, Ada_95, Ada_2005, Ada_2012);
116 pragma Ordered (Ada_Version_Type);
117 -- Versions of Ada for Ada_Version below. Note that these are ordered,
118 -- so that tests like Ada_Version >= Ada_95 are legitimate and useful.
119 -- Think twice before using "="; Ada_Version >= Ada_2012 is more likely
120 -- what you want, because it will apply to future versions of the language.
122 Ada_Version_Default : constant Ada_Version_Type := Ada_2005;
123 pragma Warnings (Off, Ada_Version_Default);
125 -- Default Ada version if no switch given. The Warnings off is to kill
126 -- constant condition warnings.
128 -- WARNING: some scripts rely on the format of this line of code. Any
129 -- change must be coordinated with the scripts requirements.
131 Ada_Version : Ada_Version_Type := Ada_Version_Default;
133 -- Current Ada version for compiler, as set by configuration pragmas,
134 -- compiler switches, or implicitly (to Ada_Version_Runtime) when a
135 -- predefined or internal file is compiled.
137 Ada_Version_Explicit : Ada_Version_Type := Ada_Version_Default;
139 -- Like Ada_Version, but does not get set implicitly for predefined
140 -- or internal units, so it reflects the Ada version explicitly set
141 -- using configuration pragmas or compiler switches (or if neither
142 -- appears, it remains set to Ada_Version_Default). This is used in
143 -- the rare cases (notably for pragmas Preelaborate_05 and Pure_05/12)
144 -- where in the run-time we want the explicit version set.
146 Ada_Version_Runtime : Ada_Version_Type := Ada_2012;
148 -- Ada version used to compile the runtime. Used to set Ada_Version (but
149 -- not Ada_Version_Explicit) when compiling predefined or internal units.
151 Ada_Final_Suffix : constant String := "final";
152 Ada_Final_Name : String_Ptr := new String'("ada" & Ada_Final_Suffix);
154 -- The name of the procedure that performs the finalization at the end of
155 -- execution. This variable may be modified by Gnatbind.Scan_Bind_Arg.
157 Ada_Init_Suffix : constant String := "init";
158 Ada_Init_Name : String_Ptr := new String'("ada" & Ada_Init_Suffix);
160 -- The name of the procedure that performs initialization at the start
161 -- of execution. This variable may be modified by Gnatbind.Scan_Bind_Arg.
163 Ada_Main_Name_Suffix : constant String := "main";
165 -- The suffix for Ada_Main_Name. Defined as a constant here so that it
166 -- can be referenced in a uniform manner to create either the default
167 -- value of Ada_Main_Name (declared below), or the non-default name
168 -- set by Gnatbind.Scan_Bind_Arg.
170 Ada_Main_Name : String_Ptr := new String'("ada_" & Ada_Main_Name_Suffix);
172 -- The name of the Ada package generated by the binder (when in Ada mode).
173 -- This variable may be modified by Gnatbind.Scan_Bind_Arg.
175 Address_Clause_Overlay_Warnings : Boolean := True;
177 -- Set False to disable address clause warnings
179 Address_Is_Private : Boolean := False;
181 -- Set True if package System has the line "type Address is private;"
183 All_Errors_Mode : Boolean := False;
185 -- Flag set to force display of multiple errors on a single line and
186 -- also repeated error messages for references to undefined identifiers
187 -- and certain other repeated error messages. Set by use of -gnatf.
189 All_Sources : Boolean := False;
191 -- Set to True to require all source files to be present. This flag is
192 -- directly modified by gnatmake to affect the shared binder routines.
194 Alternate_Main_Name : String_Ptr := null;
196 -- Set to non null when Bind_Alternate_Main_Name is True. This value
197 -- is modified as needed by Gnatbind.Scan_Bind_Arg.
199 ASIS_Mode : Boolean := False;
201 -- Enable semantic checks and tree transformations that are important
202 -- for ASIS but that are usually skipped if Operating_Mode is set to
203 -- Check_Semantics. This flag does not have the corresponding option to set
204 -- it ON. It is set ON when Tree_Output is set ON, it can also be set ON
205 -- from the code of GNSA-based tool (a client may need to set ON the
206 -- Back_Annotate_Rep_Info flag in this case. At the moment this does not
207 -- make very much sense, because GNSA cannot do back annotation).
209 Assertions_Enabled : Boolean := False;
211 -- Enable assertions made using pragma Assert
213 Assume_No_Invalid_Values : Boolean := False;
215 -- Normally, in accordance with (RM 13.9.1 (9-11)) the front end assumes
216 -- that values could have invalid representations, unless it can clearly
217 -- prove that the values are valid. If this switch is set (by -gnatB or by
218 -- pragma Assume_No_Invalid_Values (Off)), then the compiler assumes values
219 -- are valid and in range of their representations. This feature is now
220 -- fully enabled in the compiler.
222 Back_Annotate_Rep_Info : Boolean := False;
224 -- If set True, enables back annotation of representation information
225 -- by gigi, even in -gnatc mode. This is set True by the use of -gnatR
226 -- (list representation information) or -gnatt (generate tree). It is
227 -- also set true if certain Unchecked_Conversion instantiations require
228 -- checking based on annotated values.
230 Back_End_Handles_Limited_Types : Boolean;
231 -- This flag is set true if the back end can properly handle limited or
232 -- other by reference types, and avoid copies. If this flag is False, then
233 -- the front end does special expansion for conditional expressions to make
234 -- sure that no copy occurs. If the flag is True, then the expansion for
235 -- conditional expressions relies on the back end properly handling things.
236 -- Currently the default is False for all cases (set in gnat1drv). The
237 -- default can be modified using -gnatd.L (sets the flag True).
239 Bind_Alternate_Main_Name : Boolean := False;
241 -- True if main should be called Alternate_Main_Name.all.
242 -- This variable may be set to True by Gnatbind.Scan_Bind_Arg.
244 Bind_Main_Program : Boolean := True;
246 -- Set to False if not binding main Ada program
248 Bind_For_Library : Boolean := False;
250 -- Set to True if the binder needs to generate a file designed for building
251 -- a library. May be set to True by Gnatbind.Scan_Bind_Arg.
253 Bind_Only : Boolean := False;
254 -- GNATMAKE, GPRMAKE, GPRBUILD
255 -- Set to True to skip compile and link steps
256 -- (except when Compile_Only and/or Link_Only are True).
258 Blank_Deleted_Lines : Boolean := False;
260 -- Output empty lines for each line of preprocessed input that is deleted
261 -- in the output, including preprocessor lines starting with a '#'.
263 Brief_Output : Boolean := False;
265 -- Force brief error messages to standard error, even if verbose mode is
266 -- set (so that main error messages go to standard output).
268 Build_Bind_And_Link_Full_Project : Boolean := False;
270 -- Set to True to build, bind and link all the sources of a project file
273 Check_Object_Consistency : Boolean := False;
274 -- GNATBIND, GNATMAKE
275 -- Set to True to check whether every object file is consistent with
276 -- its corresponding ada library information (ALI) file. An object
277 -- file is inconsistent with the corresponding ALI file if the object
278 -- file does not exist or if it has an older time stamp than the ALI file.
279 -- Default above is for GNATBIND. GNATMAKE overrides this default to
280 -- True (see Make.Initialize) since we normally do need to check source
281 -- consistencies in gnatmake.
283 Check_Only : Boolean := False;
285 -- Set to True to do checks only, no output of binder file
287 Check_Policy_List : Node_Id := Empty;
289 -- This points to the list of N_Pragma nodes for Check_Policy pragmas
290 -- that are linked through the Next_Pragma fields, with the list being
291 -- terminated by Empty. The order is most recently processed first. Note
292 -- that Push_Scope and Pop_Scope in Sem_Ch8 save and restore the value
293 -- of this variable, implementing the required scope control for pragmas
294 -- appearing a declarative part.
296 Check_Readonly_Files : Boolean := False;
298 -- Set to True to check readonly files during the make process
300 Check_Source_Files : Boolean := True;
301 -- GNATBIND, GNATMAKE
302 -- Set to True to enable consistency checking for any source files that
303 -- are present (i.e. date must match the date in the library info file).
304 -- Set to False for object file consistency check only. This flag is
305 -- directly modified by gnatmake, to affect the shared binder routines.
307 Check_Switches : Boolean := False;
308 -- GNATMAKE, GPRMAKE, GPBUILD
309 -- Set to True to check compiler options during the make process
311 Check_Unreferenced : Boolean := False;
313 -- Set to True to enable checking for unreferenced entities other
314 -- than formal parameters (for which see Check_Unreferenced_Formals)
316 Check_Unreferenced_Formals : Boolean := False;
318 -- Set True to check for unreferenced formals. This is turned on by
319 -- -gnatwa/wf/wu and turned off by -gnatwA/wF/wU.
321 Check_Withs : Boolean := False;
323 -- Set to True to enable checking for unused withs, and also the case
324 -- of withing a package and using none of the entities in the package.
326 CodePeer_Mode : Boolean := False;
328 -- Enable full CodePeer mode (SCIL generation, disable switches that
329 -- interact badly with it, etc...).
331 Commands_To_Stdout : Boolean := False;
333 -- True if echoed commands to be written to stdout instead of stderr
335 Comment_Deleted_Lines : Boolean := False;
337 -- True if source lines removed by the preprocessor should be commented
338 -- in the output file.
340 Compile_Only : Boolean := False;
341 -- GNATMAKE, GNATCLEAN, GPRMAKE, GPBUILD, GPRCLEAN
342 -- GNATMAKE, GPRMAKE, GPRMAKE:
343 -- set to True to skip bind and link steps (except when Bind_Only is
345 -- GNATCLEAN, GPRCLEAN:
346 -- set to True to delete only the files produced by the compiler but not
347 -- the library files or the executable files.
349 Config_File : Boolean := True;
351 -- Set to False to inhibit reading and processing of gnat.adc file
353 Config_File_Names : String_List_Access := null;
355 -- Names of configuration pragmas files (given by switches -gnatec)
357 Configurable_Run_Time_Mode : Boolean := False;
359 -- Set True if the compiler is operating in configurable run-time mode.
360 -- This happens if the flag Targparm.Configurable_Run_TimeMode_On_Target
361 -- is set True, or if pragma No_Run_Time is used. See the spec of Rtsfind
362 -- for details on the handling of the latter pragma.
364 Constant_Condition_Warnings : Boolean := False;
366 -- Set to True to activate warnings on constant conditions
368 Create_Mapping_File : Boolean := False;
370 -- Set to True (-C switch) to indicate that the compiler will be invoked
371 -- with a mapping file (-gnatem compiler switch).
373 Debug_Pragmas_Enabled : Boolean := False;
375 -- Enable debug statements from pragma Debug
377 Debug_Pragmas_Disabled : Boolean := False;
379 -- Debug pragmas completely disabled (no semantic checking)
381 subtype Debug_Level_Value is Nat range 0 .. 3;
382 Debugger_Level : Debug_Level_Value := 0;
384 -- The value given to the -g parameter. The default value for -g with
385 -- no value is 2. This is usually ignored by GNATBIND, except in the
386 -- VMS version where it is passed as an argument to __gnat_initialize
387 -- to trigger the activation of the remote debugging interface.
388 -- Is this still true ???
390 Debug_Generated_Code : Boolean := False;
392 -- Set True (-gnatD switch) to debug generated expanded code instead
393 -- of the original source code. Causes debugging information to be
394 -- written with respect to the generated code file that is written.
396 Default_Exit_Status : Int := 0;
398 -- Set the default exit status value. Set by the -Xnnn switch for the
401 Default_Stack_Size : Int := -1;
403 -- Set to default primary stack size in units of bytes. Set by
404 -- the -dnnn switch for the binder. A value of -1 indicates that no
405 -- default was set by the binder.
407 Default_Sec_Stack_Size : Int := -1;
409 -- Set to default secondary stack size in units of bytes. Set by
410 -- the -Dnnn switch for the binder. A value of -1 indicates that no
411 -- default was set by the binder, and that the default should be the
412 -- initial value of System.Secondary_Stack.Default_Secondary_Stack_Size.
414 Default_Pool : Node_Id := Empty;
416 -- Used to record the storage pool name (or null literal) that is the
417 -- argument of an applicable pragma Default_Storage_Pool.
418 -- Empty: No pragma Default_Storage_Pool applies.
419 -- N_Null node: "pragma Default_Storage_Pool (null);" applies.
420 -- otherwise: "pragma Default_Storage_Pool (X);" applies, and
421 -- this points to the name X.
422 -- Push_Scope and Pop_Scope in Sem_Ch8 save and restore this value.
424 Detect_Blocking : Boolean := False;
426 -- Set True to force the run time to raise Program_Error if calls to
427 -- potentially blocking operations are detected from protected actions.
429 Display_Compilation_Progress : Boolean := False;
430 -- GNATMAKE, GPRMAKE, GPRBUILD
431 -- Set True (-d switch) to display information on progress while compiling
432 -- files. Internal flag to be used in conjunction with an IDE (e.g GPS).
434 type Distribution_Stub_Mode_Type is
437 -- Normal mode, no generation/compilation of distribution stubs
439 Generate_Receiver_Stub_Body,
440 -- The unit being compiled is the RCI body, and the compiler will
441 -- generate the body for the receiver stubs and compile it.
443 Generate_Caller_Stub_Body);
444 -- The unit being compiled is the RCI spec, and the compiler will
445 -- generate the body for the caller stubs and compile it.
447 Distribution_Stub_Mode : Distribution_Stub_Mode_Type := No_Stubs;
449 -- This enumeration variable indicates the five states of distribution
450 -- annex stub generation/compilation.
452 Do_Not_Execute : Boolean := False;
454 -- Set to True if no actual compilations should be undertaken.
456 Dump_Source_Text : Boolean := False;
458 -- Set to True (by -gnatL) to dump source text intermingled with generated
459 -- code. Effective only if either of Debug/Print_Generated_Code is true.
461 Dynamic_Elaboration_Checks : Boolean := False;
463 -- Set True for dynamic elaboration checking mode, as set by the -gnatE
464 -- switch or by the use of pragma Elaboration_Checks (Dynamic).
466 Dynamic_Stack_Measurement : Boolean := False;
468 -- Set True to enable dynamic stack measurement (-u flag for gnatbind)
470 Dynamic_Stack_Measurement_Array_Size : Nat := 100;
472 -- Number of measurements we want to store during dynamic stack analysis.
473 -- When the buffer is full, non-storable results will be output on the fly.
474 -- The value is relevant only if Dynamic_Stack_Measurement is set. Set
475 -- by processing of -u flag for gnatbind.
477 Elab_Dependency_Output : Boolean := False;
479 -- Set to True to output complete list of elaboration constraints
481 Elab_Order_Output : Boolean := False;
483 -- Set to True to output chosen elaboration order
485 Elab_Warnings : Boolean := False;
487 -- Set to True to generate full elaboration warnings (-gnatwl)
489 Enable_Overflow_Checks : Boolean := False;
491 -- Set to True if -gnato (enable overflow checks) switch is set,
494 Error_Msg_Line_Length : Nat := 0;
496 -- Records the error message line length limit. If this is set to zero,
497 -- then we get the old style behavior, in which each call to the error
498 -- message routines generates one line of output as a separate message.
499 -- If it is set to a non-zero value, then continuation lines are folded
500 -- to make a single long message, and then this message is split up into
501 -- multiple lines not exceeding the specified length. Set by -gnatj=nn.
503 Exception_Handler_Encountered : Boolean := False;
505 -- This flag is set true if the parser encounters an exception handler.
506 -- It is used to set Warn_On_Exception_Propagation True if the restriction
507 -- No_Exception_Propagation is set.
509 Exception_Extra_Info : Boolean := False;
511 -- True when switch -gnateE is used. When True, generate extra information
512 -- associated with exception messages (in particular range and index
515 Exception_Locations_Suppressed : Boolean := False;
517 -- Set to True if a Suppress_Exception_Locations configuration pragma is
520 type Exception_Mechanism_Type is
521 -- Determines the handling of exceptions. See Exp_Ch11 for details
523 (Front_End_Setjmp_Longjmp_Exceptions,
524 -- Exceptions use setjmp/longjmp generated explicitly by the
525 -- front end (this includes gigi or other equivalent parts of
526 -- the code generator). AT END handlers are converted into
527 -- exception handlers by the front end in this mode.
529 Back_End_Exceptions);
530 -- Exceptions are handled by the back end. The front end simply
531 -- generates the handlers as they appear in the source, and AT
532 -- END handlers are left untouched (they are not converted into
533 -- exception handlers when operating in this mode.
534 pragma Convention (C, Exception_Mechanism_Type);
536 Exception_Mechanism : Exception_Mechanism_Type :=
537 Front_End_Setjmp_Longjmp_Exceptions;
539 -- Set to the appropriate value depending on the default as given in
540 -- system.ads (ZCX_By_Default). The C convention is there to make this
541 -- variable accessible to gigi.
543 Exception_Tracebacks : Boolean := False;
545 -- Set to True to store tracebacks in exception occurrences (-E)
547 Extensions_Allowed : Boolean := False;
549 -- Set to True by switch -gnatX if GNAT specific language extensions
550 -- are allowed. For example, the use of 'Constrained with objects of
551 -- generic types is a GNAT extension.
553 type External_Casing_Type is (
554 As_Is, -- External names cased as they appear in the Ada source
555 Uppercase, -- External names forced to all uppercase letters
556 Lowercase); -- External names forced to all lowercase letters
558 External_Name_Imp_Casing : External_Casing_Type := Lowercase;
560 -- The setting of this flag determines the casing of external names
561 -- when the name is implicitly derived from an entity name (i.e. either
562 -- no explicit External_Name or Link_Name argument is used, or, in the
563 -- case of extended DEC pragmas, the external name is given using an
564 -- identifier. The As_Is setting is not permitted here (since this would
565 -- create Ada source programs that were case sensitive).
567 External_Name_Exp_Casing : External_Casing_Type := As_Is;
569 -- The setting of this flag determines the casing of an external name
570 -- specified explicitly with a string literal. As_Is means the string
571 -- literal is used as given with no modification to the casing. If
572 -- Lowercase or Uppercase is set, then the string is forced to all
573 -- lowercase or all uppercase letters as appropriate. Note that this
574 -- setting has no effect if the external name is given using an identifier
575 -- in the case of extended DEC import/export pragmas (in this case the
576 -- casing is controlled by External_Name_Imp_Casing), and also has no
577 -- effect if an explicit Link_Name is supplied (a link name is always
578 -- used exactly as given).
580 External_Unit_Compilation_Allowed : Boolean := False;
582 -- When True (set by gnatmake switch -x), allow compilation of sources
583 -- that are not part of any project file.
585 Fast_Math : Boolean := False;
587 -- Indicates the current setting of Fast_Math mode, as set by the use
588 -- of a Fast_Math pragma (set on by Fast_Math (On)).
590 Float_Format : Character := ' ';
592 -- A non-blank value indicates that a Float_Format pragma has been
593 -- processed, in which case this variable is set to 'I' for IEEE or
594 -- to 'V' for VAX. The setting of 'V' is only possible on OpenVMS
597 Float_Format_Long : Character := ' ';
599 -- A non-blank value indicates that a Long_Float pragma has been
600 -- processed (this pragma is recognized only in OpenVMS versions
601 -- of GNAT), in which case this variable is set to D or G for
602 -- D_Float or G_Float.
604 Force_ALI_Tree_File : Boolean := False;
606 -- Force generation of ALI file even if errors are encountered.
607 -- Also forces generation of tree file if -gnatt is also set.
609 Disable_ALI_File : Boolean := False;
611 -- Disable generation of ALI file
613 Force_Checking_Of_Elaboration_Flags : Boolean := False;
615 -- True if binding with forced checking of the elaboration flags
618 Force_Compilations : Boolean := False;
619 -- GNATMAKE, GPRMAKE, GPRBUILD
620 -- Set to force recompilations even when the objects are up-to-date.
622 Full_Path_Name_For_Brief_Errors : Boolean := False;
624 -- When True, in Brief_Output mode, each error message line
625 -- will start with the full path name of the source.
626 -- When False, only the file name without directory information
629 Full_List : Boolean := False;
631 -- Set True to generate full source listing with embedded errors
633 Full_List_File_Name : String_Ptr := null;
635 -- Set to file name to generate full source listing to named file (or if
636 -- the name is of the form .xxx, then to name.xxx where name is the source
637 -- file name with extension stripped.
639 Generate_Processed_File : Boolean := False;
641 -- True when switch -gnateG is used. When True, create in a file
642 -- <source>.prep, if the source is preprocessed.
644 Generate_SCO : Boolean := False;
646 -- True when switch -gnateS is used. When True, Source Coverage Obligation
647 -- (SCO) information is generated and output in the ALI file. See unit
648 -- Par_SCO for full details.
650 Generating_Code : Boolean := False;
652 -- True if the frontend finished its work and has called the backend to
653 -- process the tree and generate the object file.
655 Global_Discard_Names : Boolean := False;
657 -- True if a pragma Discard_Names appeared as a configuration pragma for
658 -- the current compilation unit.
660 GNAT_Mode : Boolean := False;
662 -- True if compiling in GNAT system mode (-gnatg switch)
664 Heap_Size : Nat := 0;
666 -- Heap size for memory allocations. Valid values are 32 and 64. Only
669 HLO_Active : Boolean := False;
671 -- True if High Level Optimizer is activated (-gnatH switch)
673 Identifier_Character_Set : Character;
675 -- This variable indicates the character set to be used for identifiers.
676 -- The possible settings are:
677 -- '1' Latin-5 (ISO-8859-1)
678 -- '2' Latin-5 (ISO-8859-2)
679 -- '3' Latin-5 (ISO-8859-3)
680 -- '4' Latin-5 (ISO-8859-4)
681 -- '5' Latin-5 (ISO-8859-5, Cyrillic)
682 -- '9' Latin-5 (ISO-8859-9)
683 -- 'p' PC (US, IBM page 437)
684 -- '8' PC (European, IBM page 850)
685 -- 'f' Full upper set (all distinct)
686 -- 'n' No upper characters (Ada 83 rules)
687 -- 'w' Latin-1 plus wide characters allowed in identifiers
689 -- The setting affects the set of letters allowed in identifiers and the
690 -- upper/lower case equivalences. It does not affect the interpretation of
691 -- character and string literals, which are always stored using the actual
692 -- coding in the source program. This variable is initialized to the
693 -- default value appropriate to the system (in Osint.Initialize), and then
694 -- reset if a command line switch is used to change the setting.
696 Ignore_Rep_Clauses : Boolean := False;
698 -- Set True to ignore all representation clauses. Useful when compiling
699 -- code from foreign compilers for checking or ASIS purposes. Can be
700 -- set True by use of -gnatI.
702 Implementation_Unit_Warnings : Boolean := True;
704 -- Set True to active warnings for use of implementation internal units.
705 -- Can be controlled by use of -gnatwi/-gnatwI.
707 Implicit_Packing : Boolean := False;
709 -- If set True, then a Size attribute clause on an array is allowed to
710 -- cause implicit packing instead of generating an error message. Set by
711 -- use of pragma Implicit_Packing.
713 Ineffective_Inline_Warnings : Boolean := False;
715 -- Set True to activate warnings if front-end inlining (-gnatN) is not
716 -- able to actually inline a particular call (or all calls). Can be
717 -- controlled by use of -gnatwp/-gnatwP.
719 Init_Or_Norm_Scalars : Boolean := False;
721 -- Set True if a pragma Initialize_Scalars applies to the current unit.
722 -- Also set True if a pragma Normalize_Scalars applies.
724 Initialize_Scalars : Boolean := False;
726 -- Set True if a pragma Initialize_Scalars applies to the current unit.
727 -- Note that Init_Or_Norm_Scalars is also set to True if this is True.
729 Initialize_Scalars_Mode1 : Character := 'I';
730 Initialize_Scalars_Mode2 : Character := 'N';
732 -- Set to two characters from -S switch (IN/LO/HI/EV/xx). The default
733 -- is IN (invalid values), used if no -S switch is used.
735 Inline_Active : Boolean := False;
737 -- Set True to activate pragma Inline processing across modules. Default
738 -- for now is not to inline across module boundaries.
740 Interface_Library_Unit : Boolean := False;
742 -- Set to True to indicate that at least one ALI file is an interface ALI:
743 -- then elaboration flag checks are to be generated in the binder
746 Generate_SCIL : Boolean := False;
748 -- Set True to activate SCIL code generation.
750 Invalid_Value_Used : Boolean := False;
752 -- Set True if a valid Invalid_Value attribute is encountered
754 Follow_Links_For_Files : Boolean := False;
756 -- Set to True (-eL) to process the project files in trusted mode. If
757 -- Follow_Links is False, it is assumed that the project doesn't contain
758 -- any file duplicated through symbolic links (although the latter are
759 -- still valid if they point to a file which is outside of the project),
760 -- and that no directory has a name which is a valid source name.
762 Follow_Links_For_Dirs : Boolean := False;
764 -- Set to True if directories can be links in this project, and therefore
765 -- additional system calls must be performed to ensure that we always see
766 -- the same full name for each directory.
768 Front_End_Inlining : Boolean := False;
770 -- Set True to activate inlining by front-end expansion
772 Inline_Processing_Required : Boolean := False;
774 -- Set True if inline processing is required. Inline processing is required
775 -- if an active Inline pragma is processed. The flag is set for a pragma
776 -- Inline or Inline_Always that is actually active.
778 In_Place_Mode : Boolean := False;
780 -- Set True to store ALI and object files in place i.e. in the object
781 -- directory if these files already exist or in the source directory
784 Keep_Going : Boolean := False;
785 -- GNATMAKE, GPRMAKE, GPRBUILD
786 -- When True signals to ignore compilation errors and keep processing
787 -- sources until there is no more work.
789 Keep_Temporary_Files : Boolean := False;
791 -- When True the temporary files created by the GNAT driver are not
792 -- deleted. Set by switch -dn or qualifier /KEEP_TEMPORARY_FILES.
794 Leap_Seconds_Support : Boolean := False;
796 -- Set to True to enable leap seconds support in Ada.Calendar and its
799 Link_Only : Boolean := False;
800 -- GNATMAKE, GPRMAKE, GPRBUILD
801 -- Set to True to skip compile and bind steps (except when Bind_Only is
804 List_Inherited_Aspects : Boolean := False;
806 -- List inherited invariants, preconditions, and postconditions from
807 -- Invariant'Class, Pre'Class, and Post'Class aspects. Also list inherited
808 -- subtype predicates. Set True by use of -gnatw.l and False by use of
811 List_Restrictions : Boolean := False;
813 -- Set to True to list restrictions pragmas that could apply to partition
815 List_Units : Boolean := False;
817 -- List units in the active library for a compilation (-gnatu switch)
819 List_Closure : Boolean := False;
821 -- List all sources in the closure of a main (-R gnatbind switch)
823 List_Dependencies : Boolean := False;
825 -- When True gnatmake verifies that the objects are up to date and
826 -- outputs the list of object dependencies (-M switch).
827 -- Output depends if -a switch is used or not.
828 -- This list can be used directly in a Makefile.
830 List_Representation_Info : Int range 0 .. 3 := 0;
832 -- Set non-zero by -gnatR switch to list representation information.
833 -- The settings are as follows:
835 -- 0 = no listing of representation information (default as above)
836 -- 1 = list rep info for user defined record and array types
837 -- 2 = list rep info for all user defined types and objects
838 -- 3 = like 2, but variable fields are decoded symbolically
840 List_Representation_Info_To_File : Boolean := False;
842 -- Set true by -gnatRs switch. Causes information from -gnatR/1/2/3 to be
843 -- written to file.rep (where file is the name of the source file) instead
844 -- of stdout. For example, if file x.adb is compiled using -gnatR2s then
845 -- representation info is written to x.adb.ref.
847 List_Representation_Info_Mechanisms : Boolean := False;
849 -- Set true by -gnatRm switch. Causes information on mechanisms to be
850 -- included in the representation output information.
852 List_Preprocessing_Symbols : Boolean := False;
854 -- Set to True if symbols for preprocessing a source are to be listed
855 -- before preprocessing occurs. Set to True by switch -s of gnatprep or
856 -- -s in preprocessing data file for the compiler.
858 type Create_Repinfo_File_Proc is access procedure (Src : String);
859 type Write_Repinfo_Line_Proc is access procedure (Info : String);
860 type Close_Repinfo_File_Proc is access procedure;
861 -- Types used for procedure addresses below
863 Create_Repinfo_File_Access : Create_Repinfo_File_Proc := null;
864 Write_Repinfo_Line_Access : Write_Repinfo_Line_Proc := null;
865 Close_Repinfo_File_Access : Close_Repinfo_File_Proc := null;
867 -- These three locations are left null when operating in non-compiler (e.g.
868 -- ASIS mode), but when operating in compiler mode, they are set to point
869 -- to the three corresponding procedures in Osint-C. The reason for this
870 -- slightly strange interface is to stop Repinfo from dragging in Osint in
871 -- ASIS mode, which would include lots of unwanted units in the ASIS build.
873 type Create_List_File_Proc is access procedure (S : String);
874 type Write_List_Info_Proc is access procedure (S : String);
875 type Close_List_File_Proc is access procedure;
876 -- Types used for procedure addresses below
878 Create_List_File_Access : Create_List_File_Proc := null;
879 Write_List_Info_Access : Write_List_Info_Proc := null;
880 Close_List_File_Access : Close_List_File_Proc := null;
882 -- These three locations are left null when operating in non-compiler
883 -- (e.g. from the binder), but when operating in compiler mode, they are
884 -- set to point to the three corresponding procedures in Osint-C. The
885 -- reason for this slightly strange interface is to prevent Repinfo
886 -- from dragging in Osint-C in the binder, which would include unwanted
887 -- units in the binder.
889 Locking_Policy : Character := ' ';
891 -- Set to ' ' for the default case (no locking policy specified). Reset to
892 -- first character (uppercase) of locking policy name if a valid pragma
893 -- Locking_Policy is encountered.
895 Locking_Policy_Sloc : Source_Ptr := No_Location;
897 -- Remember location of previous Locking_Policy pragma. This is used for
898 -- inconsistency error messages. A value of System_Location is used if the
899 -- policy is set in package System.
901 Look_In_Primary_Dir : Boolean := True;
902 -- GNAT, GNATBIND, GNATMAKE, GNATCLEAN
903 -- Set to False if a -I- was present on the command line. When True we are
904 -- allowed to look in the primary directory to locate other source or
907 Make_Steps : Boolean := False;
909 -- Set to True when either Compile_Only, Bind_Only or Link_Only is
912 Main_Index : Int := 0;
914 -- This is set to non-zero by gnatmake switch -eInnn to indicate that
915 -- the main program is the nnn unit in a multi-unit source file.
917 Mapping_File_Name : String_Ptr := null;
919 -- File name of mapping between unit names, file names and path names.
920 -- (given by switch -gnatem)
922 Maximum_Messages : Int := 9999;
924 -- Maximum default number of errors before compilation is terminated, or in
925 -- the case of GNAT, maximum number of warnings before further warnings are
926 -- suppressed. Can be overridden by -gnatm (GNAT) or -m (GNATBIND) switch.
928 Maximum_File_Name_Length : Int;
930 -- Maximum number of characters allowed in a file name, not counting the
931 -- extension, as set by the appropriate switch. If no switch is given,
932 -- then this value is initialized by Osint to the appropriate value.
934 Maximum_Processes : Positive := 1;
935 -- GNATMAKE, GPRMAKE, GPRBUILD
936 -- Maximum number of processes that should be spawned to carry out
939 Minimal_Recompilation : Boolean := False;
941 -- Set to True if minimal recompilation mode requested
943 Special_Exception_Package_Used : Boolean := False;
945 -- Set to True if either of the unit GNAT.Most_Recent_Exception or
946 -- GNAT.Exception_Traces is with'ed. Used to inhibit transformation of
947 -- local raise statements into gotos in the presence of either package.
949 Multiple_Unit_Index : Int;
951 -- This is set non-zero if the current unit is being compiled in multiple
952 -- unit per file mode, meaning that the current unit is selected from the
953 -- sequence of units in the current source file, using the value stored
954 -- in this variable (e.g. 2 = select second unit in file). A value of
955 -- zero indicates that we are in normal (one unit per file) mode.
957 No_Main_Subprogram : Boolean := False;
958 -- GNATMAKE, GNATBIND
959 -- Set to True if compilation/binding of a program without main
960 -- subprogram requested.
962 No_Run_Time_Mode : Boolean := False;
964 -- This flag is set True if a No_Run_Time pragma is encountered. See
965 -- spec of Rtsfind for a full description of handling of this pragma.
967 No_Split_Units : Boolean := False;
969 -- Set to True with switch --no-split-units. When True, unit sources, spec,
970 -- body and subunits, must all be in the same project.This is checked after
973 No_Stdinc : Boolean := False;
974 -- GNAT, GNATBIND, GNATMAKE, GNATFIND, GNATXREF
975 -- Set to True if no default source search dirs added to search list
977 No_Stdlib : Boolean := False;
978 -- GNATMAKE, GNATBIND, GNATFIND, GNATXREF
979 -- Set to True if no default library search dirs added to search list
981 No_Strict_Aliasing : Boolean := False;
983 -- Set True if pragma No_Strict_Aliasing with no parameters encountered
985 Normalize_Scalars : Boolean := False;
987 -- Set True if a pragma Normalize_Scalars applies to the current unit.
988 -- Note that Init_Or_Norm_Scalars is also set to True if this is True.
990 Object_Directory_Present : Boolean := False;
992 -- Set to True when an object directory is specified with option -D
994 One_Compilation_Per_Obj_Dir : Boolean := False;
995 -- GNATMAKE, GPRBUILD
996 -- Set to True with switch --single-compile-per-obj-dir. When True, there
997 -- cannot be simultaneous compilations with the object files in the same
998 -- object directory, if project files are used.
1000 type Operating_Mode_Type is (Check_Syntax, Check_Semantics, Generate_Code);
1001 Operating_Mode : Operating_Mode_Type := Generate_Code;
1003 -- Indicates the operating mode of the compiler. The default is generate
1004 -- code, which runs the parser, semantics and backend. Switches can be
1005 -- used to set syntax checking only mode, or syntax and semantics checking
1006 -- only mode. Operating_Mode can also be modified as a result of detecting
1007 -- errors during the compilation process. In particular if any serious
1008 -- error is detected then this flag is reset from Generate_Code to
1009 -- Check_Semantics after generating an error message.
1011 Optimize_Alignment : Character := 'O';
1012 -- Setting of Optimize_Alignment, set to T/S/O for time/space/off. Can
1013 -- be modified by use of pragma Optimize_Alignment.
1015 Optimize_Alignment_Local : Boolean := False;
1016 -- Set True if Optimize_Alignment mode is set by a local configuration
1017 -- pragma that overrides the gnat.adc (or other configuration file) default
1018 -- so that the unit is not dependent on the default setting. Also always
1019 -- set True for internal units, since these always have a default setting
1020 -- of Optimize_Alignment (Off) that is enforced (essentially equivalent to
1021 -- them all having such an explicit pragma in each unit).
1023 Original_Operating_Mode : Operating_Mode_Type := Generate_Code;
1025 -- Indicates the original operating mode of the compiler as set by compiler
1026 -- options. This is identical to Operating_Mode except that this is not
1027 -- affected by errors.
1029 Optimization_Level : Int;
1030 pragma Import (C, Optimization_Level, "optimize");
1031 -- Constant reflecting the optimization level (0,1,2,3 for -O0,-O1,-O2,-O3)
1032 -- See jmissing.c and aamissing.c for definitions for dotnet/jgnat and
1033 -- GNAAMP back ends.
1035 Optimize_Size : Int;
1036 pragma Import (C, Optimize_Size, "optimize_size");
1037 -- Constant reflecting setting of -Os (optimize for size). Set to nonzero
1038 -- in -Os mode and set to zero otherwise. See jmissing.c and aamissing.c
1039 -- for definitions of "optimize_size" for dotnet/jgnat and GNAAMP backends
1041 Output_File_Name_Present : Boolean := False;
1042 -- GNATBIND, GNAT, GNATMAKE, GPRMAKE
1043 -- Set to True when the output C file name is given with option -o for
1044 -- GNATBIND, when the object file name is given with option -gnatO for GNAT
1045 -- or when the executable is given with option -o for GNATMAKE or GPRMAKE.
1047 Output_Linker_Option_List : Boolean := False;
1049 -- True if output of list of linker options is requested (-K switch set)
1051 Output_ALI_List : Boolean := False;
1052 ALI_List_Filename : String_Ptr;
1054 -- True if output of list of ALIs is requested (-A switch set). List is
1055 -- output under the given filename, or standard output if not specified.
1057 Output_Object_List : Boolean := False;
1058 Object_List_Filename : String_Ptr;
1060 -- True if output of list of objects is requested (-O switch set). List is
1061 -- output under the given filename, or standard output if not specified.
1063 Overflow_Checks_Unsuppressed : Boolean := False;
1065 -- Set to True if at least one occurrence of pragma Unsuppress
1066 -- (All_Checks|Overflow_Checks) has been processed.
1068 Persistent_BSS_Mode : Boolean := False;
1070 -- True if a Persistent_BSS configuration pragma is in effect, causing
1071 -- potentially persistent data to be placed in the persistent_bss section.
1073 Pessimistic_Elab_Order : Boolean := False;
1075 -- True if pessimistic elaboration order is to be chosen (-p switch set)
1077 Polling_Required : Boolean := False;
1079 -- Set to True if polling for asynchronous abort is enabled by using
1080 -- the -gnatP option for GNAT.
1082 Preprocessing_Data_File : String_Ptr := null;
1084 -- Set by switch -gnatep=. The file name of the preprocessing data file.
1086 Preprocessing_Symbol_Defs : String_List_Access := new String_List (1 .. 4);
1087 -- An extensible array to temporarily stores symbol definitions specified
1088 -- on the command line with -gnateD switches.
1089 -- What is this magic constant 4 ???
1090 -- What is extensible about this fixed length array ???
1092 Preprocessing_Symbol_Last : Natural := 0;
1093 -- Index of last symbol definition in array Symbol_Definitions
1095 Print_Generated_Code : Boolean := False;
1097 -- Set to True to enable output of generated code in source form. This
1098 -- flag is set by the -gnatG switch.
1100 Print_Standard : Boolean := False;
1102 -- Set to true to enable printing of package standard in source form.
1103 -- This flag is set by the -gnatS switch
1105 Propagate_Exceptions : Boolean := False;
1107 -- Indicates if subprogram descriptor exception tables should be
1108 -- built for imported subprograms. Set True if a Propagate_Exceptions
1109 -- pragma applies to the extended main unit.
1111 type Usage is (Unknown, Not_In_Use, In_Use);
1112 Project_File_In_Use : Usage := Unknown;
1114 -- Indicates if a project file is used or not. Set to In_Use by the first
1117 Queuing_Policy : Character := ' ';
1119 -- Set to ' ' for the default case (no queuing policy specified). Reset to
1120 -- first character (uppercase) of locking policy name if a valid
1121 -- Queuing_Policy pragma is encountered.
1123 Queuing_Policy_Sloc : Source_Ptr := No_Location;
1125 -- Remember location of previous Queuing_Policy pragma. This is used for
1126 -- inconsistency error messages. A value of System_Location is used if the
1127 -- policy is set in package System.
1129 Quiet_Output : Boolean := False;
1130 -- GNATMAKE, GNATCLEAN, GPRMAKE, GPRBUILD, GPRCLEAN
1131 -- Set to True if the tool should not have any output if there are no
1132 -- errors or warnings.
1134 Replace_In_Comments : Boolean := False;
1136 -- Set to True if -C switch used
1138 RTS_Lib_Path_Name : String_Ptr := null;
1139 RTS_Src_Path_Name : String_Ptr := null;
1141 -- Set to the "adalib" and "adainclude" directories of the run time
1142 -- specified by --RTS=.
1144 RTS_Switch : Boolean := False;
1145 -- GNAT, GNATMAKE, GNATBIND, GNATLS, GNATFIND, GNATXREF
1146 -- Set to True when the --RTS switch is set
1148 Run_Path_Option : Boolean := True;
1149 -- GNATMAKE, GNATLINK
1150 -- Set to False when no run_path_option should be issued to the linker
1152 Search_Directory_Present : Boolean := False;
1154 -- Set to True when argument is -I. Reset to False when next argument, a
1155 -- search directory path is taken into account. Note that this is quite
1156 -- different from other switches in this section in that it is only set in
1157 -- a transitory manner as a result of scanning a -I switch with no file
1158 -- name, and if set, is an indication that the next argument is to be
1159 -- treated as a file name.
1161 Sec_Stack_Used : Boolean := False;
1163 -- Set True if generated code uses the System.Secondary_Stack package. For
1164 -- the binder, set if any unit uses the secondary stack package.
1166 Setup_Projects : Boolean := False;
1168 -- Set to True for GNAT SETUP: the Project Manager creates non existing
1169 -- object, library and exec directories.
1171 Shared_Libgnat : Boolean;
1173 -- Set to True if a shared libgnat is requested by using the -shared option
1174 -- for GNATBIND and to False when using the -static option. The value of
1175 -- this flag is set by Gnatbind.Scan_Bind_Arg.
1177 Short_Circuit_And_Or : Boolean := False;
1179 -- Set True if a pragma Short_Circuit_And_Or applies to the current unit.
1181 Short_Descriptors : Boolean := False;
1183 -- Set True if a pragma Short_Descriptors applies to the current unit.
1185 Sprint_Line_Limit : Nat := 72;
1187 -- Limit values for chopping long lines in Sprint output, can be reset
1188 -- by use of NNN parameter with -gnatG or -gnatD switches.
1190 Stack_Checking_Enabled : Boolean;
1192 -- Set to indicate if -fstack-check switch is set for the compilation. True
1193 -- means that the switch is set, so that stack checking is enabled. False
1194 -- means that the switch is not set (no stack checking). This value is
1195 -- obtained from the external imported value flag_stack_check in the gcc
1196 -- backend (see Frontend) and may be referenced throughout the compilation
1199 Style_Check : Boolean := False;
1201 -- Set True to perform style checks. Activates checks carried out in
1202 -- package Style (see body of this package for details of checks). This
1203 -- flag is set True by either the -gnatg or -gnaty switches.
1205 Suppress_All_Inlining : Boolean := False;
1207 -- Set by -fno-inline. Suppresses all inlining, both front end and back end
1208 -- regardless of any other switches that are set.
1210 Suppress_Control_Flow_Optimizations : Boolean := False;
1212 -- Set by -fpreserve-control-flow. Suppresses control flow optimizations
1213 -- that interfere with coverage analysis based on the object code.
1215 System_Extend_Pragma_Arg : Node_Id := Empty;
1217 -- Set non-empty if and only if a correct Extend_System pragma was present
1218 -- in which case it points to the argument of the pragma, and the name can
1219 -- be located as Chars (Expression (System_Extend_Pragma_Arg)).
1221 System_Extend_Unit : Node_Id := Empty;
1223 -- This is set to Empty if GNAT_Mode is set, since pragma Extend_System
1224 -- is never appropriate in GNAT_Mode (and causes troubles, including
1225 -- bogus circularities, if we try to compile the run-time library with
1226 -- a System extension). If GNAT_Mode is not set, then System_Extend_Unit
1227 -- is a copy of the value set in System_Extend_Pragma_Arg.
1229 Subunits_Missing : Boolean := False;
1231 -- This flag is set true if missing subunits are detected with code
1232 -- generation active. This causes code generation to be skipped.
1234 Suppress_Checks : Boolean := False;
1236 -- Set to True if -gnatp (suppress all checks) switch present.
1238 Suppress_Options : Suppress_Array;
1240 -- Flags set True to suppress corresponding check, i.e. add an implicit
1241 -- pragma Suppress at the outer level of each unit compiled. Note that
1242 -- these suppress actions can be overridden by the use of the Unsuppress
1243 -- pragma. This variable is initialized by Osint.Initialize.
1245 Suppress_Back_Annotation : Boolean := False;
1247 -- This flag is set True if back annotation of representation information
1248 -- is to be suppressed. This is set if neither -gnatt or -gnatR0-3 is set.
1249 -- This avoids unnecessary time being spent on back annotation.
1251 Table_Factor : Int := 1;
1253 -- Factor by which all initial table sizes set in Alloc are multiplied.
1254 -- Used in Table to calculate initial table sizes (the initial table size
1255 -- is the value in Alloc, used as the Table_Initial parameter value,
1256 -- multiplied by the factor given here. The default value is used if no
1257 -- -gnatT switch appears.
1259 Tagged_Type_Expansion : Boolean := True;
1261 -- Set True if tagged types and interfaces should be expanded by the
1262 -- front-end. If False, the original tree is left unexpanded for tagged
1263 -- types and dispatching calls, assuming the underlying target supports
1264 -- it (e.g. in the JVM case).
1266 Task_Dispatching_Policy : Character := ' ';
1268 -- Set to ' ' for the default case (no task dispatching policy specified).
1269 -- Reset to first character (uppercase) of task dispatching policy name
1270 -- if a valid Task_Dispatching_Policy pragma is encountered.
1272 Task_Dispatching_Policy_Sloc : Source_Ptr := No_Location;
1274 -- Remember location of previous Task_Dispatching_Policy pragma. This is
1275 -- used for inconsistency error messages. A value of System_Location is
1276 -- used if the policy is set in package System.
1278 Tasking_Used : Boolean := False;
1279 -- Set True if any tasking construct is encountered. Used to activate the
1280 -- output of the Q, L and T lines in ALI files.
1282 Time_Slice_Set : Boolean := False;
1284 -- Set True if a pragma Time_Slice is processed in the main unit, or
1285 -- if the -gnatTnn switch is present to set a time slice value.
1287 Time_Slice_Value : Nat;
1289 -- Time slice value. Valid only if Time_Slice_Set is True, i.e. if
1290 -- Time_Slice pragma has been processed. Set to the time slice value in
1291 -- microseconds. Negative values are stored as zero, and the value is not
1292 -- larger than 1_000_000_000 (1000 seconds). Values larger than this are
1293 -- reset to this maximum. This can also be set with the -gnatTnn switch.
1295 Tolerate_Consistency_Errors : Boolean := False;
1297 -- Tolerate time stamp and other consistency errors. If this flag is set to
1298 -- True (-t), then inconsistencies result in warnings rather than errors.
1300 Treat_Categorization_Errors_As_Warnings : Boolean := False;
1301 -- Normally categorization errors are true illegalities. If this switch
1302 -- is set, then such errors result in warning messages rather than error
1303 -- messages. Set True by -gnateP (P for Pure/Preelaborate).
1305 Treat_Restrictions_As_Warnings : Boolean := False;
1307 -- Set True to treat pragma Restrictions as Restriction_Warnings. Set by
1310 Tree_Output : Boolean := False;
1312 -- Set to True (-gnatt) to generate output tree file
1314 True_VMS_Target : Boolean := False;
1315 -- Set True if we are on a VMS target. The setting of this flag reflects
1316 -- the true state of the compile, unlike Targparm.OpenVMS_On_Target which
1317 -- can also be true when debug flag m is set (-gnatdm). This is used in the
1318 -- few cases where we do NOT want -gnatdm to trigger the VMS behavior.
1320 Try_Semantics : Boolean := False;
1322 -- Flag set to force attempt at semantic analysis, even if parser errors
1323 -- occur. This will probably cause blowups at this stage in the game. On
1324 -- the other hand, most such blowups will be caught cleanly and simply
1325 -- say compilation abandoned. This flag is set to True by -gnatq or -gnatQ.
1327 Unchecked_Shared_Lib_Imports : Boolean := False;
1329 -- Set to True when shared library projects are allowed to import projects
1330 -- that are not shared library projects. Set by switch
1331 -- --unchecked-shared-lib-imports.
1333 Undefined_Symbols_Are_False : Boolean := False;
1335 -- Set to True by switch -u of gnatprep or -u in the preprocessing data
1336 -- file for the compiler. Indicates that while preprocessing sources,
1337 -- symbols that are not defined have the value FALSE.
1339 Unique_Error_Tag : Boolean := Tag_Errors;
1341 -- Indicates if error messages are to be prefixed by the string error:
1342 -- Initialized from Tag_Errors, can be forced on with the -gnatU switch.
1344 Universal_Addressing_On_AAMP : Boolean := False;
1346 -- Indicates if library-level objects should be accessed and updated using
1347 -- universal addressing instructions on the AAMP architecture. This flag is
1348 -- set to True when pragma Universal_Data is given as a configuration
1351 Unreserve_All_Interrupts : Boolean := False;
1353 -- Normally set False, set True if a valid Unreserve_All_Interrupts pragma
1354 -- appears anywhere in the main unit for GNAT, or if any ALI file has the
1355 -- corresponding attribute set in GNATBIND.
1357 Upper_Half_Encoding : Boolean := False;
1359 -- Normally set False, indicating that upper half ISO 8859-1 characters are
1360 -- used in the normal way to represent themselves. If the wide character
1361 -- encoding method uses the upper bit for this encoding, then this flag is
1362 -- set True, and upper half characters in the source indicate the start of
1363 -- a wide character sequence. Set by -gnatW or -W switches.
1365 Use_Include_Path_File : Boolean := False;
1366 -- GNATMAKE, GPRBUILD
1367 -- When True, create a source search path file, even when a mapping file
1370 Usage_Requested : Boolean := False;
1371 -- GNAT, GNATBIND, GNATMAKE
1372 -- Set to True if -h (-gnath for the compiler) switch encountered
1373 -- requesting usage information
1375 Use_Expression_With_Actions : Boolean;
1376 -- The N_Expression_With_Actions node has been introduced relatively
1377 -- recently, and not all back ends are prepared to handle it yet. So
1378 -- we use this flag to suppress its use during a transitional period.
1379 -- Currently the default is False for all cases (set in gnat1drv).
1380 -- The default can be modified using -gnatd.X/-gnatd.Y.
1382 Use_Pragma_Linker_Constructor : Boolean := False;
1384 -- True if pragma Linker_Constructor applies to adainit
1386 Use_VADS_Size : Boolean := False;
1388 -- Set to True if a valid pragma Use_VADS_Size is processed
1390 Validity_Checks_On : Boolean := True;
1392 -- This flag determines if validity checking is on or off. The initial
1393 -- state is on, and the required default validity checks are active. The
1394 -- actual set of checks that is performed if Validity_Checks_On is set is
1395 -- defined by the switches in package Validsw. The Validity_Checks_On flag
1396 -- is controlled by pragma Validity_Checks (On | Off), and also some
1397 -- generated compiler code (typically code that has to do with validity
1398 -- check generation) is compiled with this flag set to False. This flag is
1399 -- set to False by the -gnatp switch.
1401 Verbose_Mode : Boolean := False;
1402 -- GNAT, GNATBIND, GNATMAKE, GNATLINK, GNATLS, GNATNAME, GNATCLEAN,
1403 -- GPRMAKE, GPRBUILD, GPRCLEAN
1404 -- Set to True to get verbose mode (full error message text and location
1405 -- information sent to standard output, also header, copyright and summary)
1407 type Verbosity_Level_Type is (None, Low, Medium, High);
1408 pragma Ordered (Verbosity_Level_Type);
1409 Verbosity_Level : Verbosity_Level_Type := High;
1410 -- GNATMAKE, GPRMAKE
1411 -- Modified by gnatmake or gprmake switches -v, -vl, -vm, -vh. Indicates
1412 -- the level of verbosity of informational messages:
1414 -- In Low Verbosity, the reasons why a source is recompiled, the name
1415 -- of the executable and the reason it must be rebuilt is output.
1417 -- In Medium Verbosity, additional lines are output for each ALI file
1420 -- In High Verbosity, additional lines are output when the ALI file
1421 -- is part of an Ada library, is read-only or is part of the runtime.
1423 Warn_On_Ada_2005_Compatibility : Boolean := True;
1425 -- Set to True to generate all warnings on Ada 2005 compatibility issues,
1426 -- including warnings on Ada 2005 obsolescent features used in Ada 2005
1427 -- mode. Set False by -gnatwY.
1429 Warn_On_Ada_2012_Compatibility : Boolean := True;
1431 -- Set to True to generate all warnings on Ada 2012 compatibility issues,
1432 -- including warnings on Ada 2012 obsolescent features used in Ada 2012
1433 -- mode. Set False by -gnatwY.
1435 Warn_On_All_Unread_Out_Parameters : Boolean := False;
1437 -- Set to True to generate warnings in all cases where a variable is
1438 -- modified by being passed as to an OUT formal, but the resulting value is
1439 -- never read. The default is that this warning is suppressed, except in
1442 Warn_On_Assertion_Failure : Boolean := True;
1444 -- Set to True to activate warnings on assertions that can be determined
1445 -- at compile time will always fail. Set false by -gnatw.A.
1447 Warn_On_Assumed_Low_Bound : Boolean := True;
1449 -- Set to True to activate warnings for string parameters that are indexed
1450 -- with literals or S'Length, presumably assuming a lower bound of one. Set
1451 -- False by -gnatwW.
1453 Warn_On_Atomic_Synchronization : Boolean := False;
1455 -- Set to True to generate information messages for atomic synchronization.
1456 -- Set True by use of -gnatw.n.
1458 Warn_On_Bad_Fixed_Value : Boolean := False;
1460 -- Set to True to generate warnings for static fixed-point expression
1461 -- values that are not an exact multiple of the small value of the type.
1463 Warn_On_Biased_Representation : Boolean := True;
1465 -- Set to True to generate warnings for size clauses, component clauses
1466 -- and component_size clauses that force biased representation. Set False
1469 Warn_On_Constant : Boolean := False;
1471 -- Set to True to generate warnings for variables that could be declared
1472 -- as constants. Modified by use of -gnatwk/K.
1474 Warn_On_Deleted_Code : Boolean := False;
1476 -- Set to True to generate warnings for code deleted by the front end
1477 -- for conditional statements whose outcome is known at compile time.
1478 -- Modified by use of -gnatwt/T.
1480 Warn_On_Dereference : Boolean := False;
1482 -- Set to True to generate warnings for implicit dereferences for array
1483 -- indexing and record component access. Modified by use of -gnatwd/D.
1485 Warn_On_Export_Import : Boolean := True;
1487 -- Set to True to generate warnings for suspicious use of export or
1488 -- import pragmas. Modified by use of -gnatwx/X.
1490 Warn_On_Hiding : Boolean := False;
1492 -- Set to True to generate warnings if a declared entity hides another
1493 -- entity. The default is that this warning is suppressed.
1495 Warn_On_Modified_Unread : Boolean := False;
1497 -- Set to True to generate warnings if a variable is assigned but is never
1498 -- read. Also controls warnings for similar cases involving out parameters,
1499 -- but only if there is only one out parameter for the procedure involved.
1500 -- The default is that this warning is suppressed.
1502 Warn_On_No_Value_Assigned : Boolean := True;
1504 -- Set to True to generate warnings if no value is ever assigned to a
1505 -- variable that is at least partially uninitialized. Set to false to
1506 -- suppress such warnings. The default is that such warnings are enabled.
1508 Warn_On_Non_Local_Exception : Boolean := False;
1510 -- Set to True to generate warnings for non-local exception raises and also
1511 -- handlers that can never handle a local raise. This warning is only ever
1512 -- generated if pragma Restrictions (No_Exception_Propagation) is set. The
1513 -- default is not to generate the warnings except that if the source has
1514 -- at least one exception handler, and this restriction is set, and the
1515 -- warning was not explicitly turned off, then it is turned on by default.
1517 No_Warn_On_Non_Local_Exception : Boolean := False;
1519 -- This is set to True if the above warning is explicitly suppressed. We
1520 -- use this to avoid turning it on by default when No_Exception_Propagation
1521 -- restriction is set and an exception handler is present.
1523 Warn_On_Object_Renames_Function : Boolean := False;
1525 -- Set to True to generate warnings when a function result is renamed as
1526 -- an object. The default is that this warning is disabled.
1528 Warn_On_Obsolescent_Feature : Boolean := False;
1530 -- Set to True to generate warnings on use of any feature in Annex or if a
1531 -- subprogram is called for which a pragma Obsolescent applies.
1533 Warn_On_Overlap : Boolean := False;
1535 -- Set to True to generate warnings when a writable actual which is not
1536 -- a by-copy type overlaps with another actual in a subprogram call.
1538 Warn_On_Questionable_Missing_Parens : Boolean := True;
1540 -- Set to True to generate warnings for cases where parentheses are missing
1541 -- and the usage is questionable, because the intent is unclear.
1543 Warn_On_Parameter_Order : Boolean := False;
1545 -- Set to True to generate warnings for cases where the argument list for
1546 -- a call is a sequence of identifiers that match the formal identifiers,
1547 -- but are in the wrong order.
1549 Warn_On_Redundant_Constructs : Boolean := False;
1551 -- Set to True to generate warnings for redundant constructs (e.g. useless
1552 -- assignments/conversions). The default is that this warning is disabled.
1554 Warn_On_Reverse_Bit_Order : Boolean := True;
1556 -- Set to True to generate warning (informational) messages for component
1557 -- clauses that are affected by non-standard bit-order. The default is
1558 -- that this warning is enabled.
1560 Warn_On_Suspicious_Contract : Boolean := False;
1562 -- Set to True to generate warnings for suspicious contracts expressed as
1563 -- pragmas or aspects precondition and postcondition. The default is that
1564 -- this warning is disabled.
1566 Warn_On_Suspicious_Modulus_Value : Boolean := True;
1568 -- Set to True to generate warnings for suspicious modulus values. The
1569 -- default is that this warning is enabled.
1571 Warn_On_Unchecked_Conversion : Boolean := True;
1573 -- Set to True to generate warnings for unchecked conversions that may have
1574 -- non-portable semantics (e.g. because sizes of types differ). The default
1575 -- is that this warning is enabled.
1577 Warn_On_Unordered_Enumeration_Type : Boolean := False;
1579 -- Set to True to generate warnings for inappropriate uses (comparisons
1580 -- and explicit ranges) on unordered enumeration types (which includes
1581 -- all enumeration types for which pragma Ordered is not given). The
1582 -- default is that this warning is disabled.
1584 Warn_On_Unrecognized_Pragma : Boolean := True;
1586 -- Set to True to generate warnings for unrecognized pragmas. The default
1587 -- is that this warning is enabled.
1589 Warn_On_Unrepped_Components : Boolean := False;
1591 -- Set to True to generate warnings for the case of components of record
1592 -- which have a record representation clause but this component does not
1593 -- have a component clause. The default is that this warning is disabled.
1595 Warn_On_Warnings_Off : Boolean := False;
1597 -- Set to True to generate warnings for use of Pragma Warnings (Off, ent),
1598 -- where either the pragma is never used, or it could be replaced by a
1599 -- pragma Unmodified or Unreferenced.
1601 type Warning_Mode_Type is (Suppress, Normal, Treat_As_Error);
1602 Warning_Mode : Warning_Mode_Type := Normal;
1604 -- Controls treatment of warning messages. If set to Suppress, warning
1605 -- messages are not generated at all. In Normal mode, they are generated
1606 -- but do not count as errors. In Treat_As_Error mode, warning messages
1607 -- are generated and are treated as errors.
1609 Wide_Character_Encoding_Method : WC_Encoding_Method := WCEM_Brackets;
1611 -- Method used for encoding wide characters in the source program. See
1612 -- description of type in unit System.WCh_Con for a list of the methods
1613 -- that are currently supported. Note that brackets notation is always
1614 -- recognized in source programs regardless of the setting of this
1615 -- variable. The default setting causes only the brackets notation to be
1616 -- recognized. If this is the main unit, this setting also controls the
1617 -- output of the W=? parameter in the ALI file, which is used to provide
1618 -- the default for encoding [Wide_[Wide_]]Text_IO files. For the binder,
1619 -- the value set here overrides this main unit default.
1621 Wide_Character_Encoding_Method_Specified : Boolean := False;
1623 -- Set True if the value in Wide_Character_Encoding_Method was set as
1624 -- a result of an explicit -gnatW? or -W? switch. False otherwise.
1626 Xref_Active : Boolean := True;
1628 -- Set if cross-referencing is enabled (i.e. xref info in ALI files)
1630 Zero_Formatting : Boolean := False;
1632 -- Do no formatting (no title, no leading spaces, no empty lines) in
1633 -- auxiliary outputs (-e, -K, -l, -R).
1635 ----------------------------
1636 -- Configuration Settings --
1637 ----------------------------
1639 -- These are settings that are used to establish the mode at the start of
1640 -- each unit. The values defined below can be affected either by command
1641 -- line switches, or by the use of appropriate configuration pragmas in a
1642 -- configuration pragma file.
1644 Ada_Version_Config : Ada_Version_Type;
1646 -- This is the value of the configuration switch for the Ada 83 mode, as
1647 -- set by the command line switches -gnat83/95/05, and possibly modified by
1648 -- the use of configuration pragmas Ada_*. This switch is used to set the
1649 -- initial value for Ada_Version mode at the start of analysis of a unit.
1650 -- Note however that the setting of this flag is ignored for internal and
1651 -- predefined units (which are always compiled in the most up to date
1654 Ada_Version_Explicit_Config : Ada_Version_Type;
1656 -- This is set in the same manner as Ada_Version_Config. The difference is
1657 -- that the setting of this flag is not ignored for internal and predefined
1658 -- units, which for some purposes do indeed access this value, regardless
1659 -- of the fact that they are compiled the most up to date ada version).
1661 Assertions_Enabled_Config : Boolean;
1663 -- This is the value of the configuration switch for assertions enabled
1664 -- mode, as possibly set by the command line switch -gnata, and possibly
1665 -- modified by the use of the configuration pragma Assertion_Policy.
1667 Assume_No_Invalid_Values_Config : Boolean;
1669 -- This is the value of the configuration switch for assuming "no invalid
1670 -- values enabled" mode, as possibly set by the command line switch
1671 -- -gnatB, and possibly modified by the use of the configuration pragma
1672 -- Assume_No_Invalid_Values.
1674 Check_Policy_List_Config : Node_Id;
1676 -- This points to the list of N_Pragma nodes for Check_Policy pragmas
1677 -- that are linked through the Next_Pragma fields, with the list being
1678 -- terminated by Empty. The order is most recently processed first. This
1679 -- list includes only those pragmas in configuration pragma files.
1681 Debug_Pragmas_Disabled_Config : Boolean;
1683 -- This is the value of the configuration switch for debug pragmas disabled
1684 -- mode, as possibly set by use of the configuration pragma Debug_Policy.
1686 Debug_Pragmas_Enabled_Config : Boolean;
1688 -- This is the value of the configuration switch for debug pragmas enabled
1689 -- mode, as possibly set by the command line switch -gnata and possibly
1690 -- modified by the use of the configuration pragma Debug_Policy.
1692 Default_Pool_Config : Node_Id := Empty;
1694 -- Same as Default_Pool above, except this is only for Default_Storage_Pool
1695 -- pragmas that are configuration pragmas.
1697 Dynamic_Elaboration_Checks_Config : Boolean := False;
1699 -- Set True for dynamic elaboration checking mode, as set by the -gnatE
1700 -- switch or by the use of pragma Elaboration_Checking (Dynamic).
1702 Exception_Locations_Suppressed_Config : Boolean := False;
1704 -- Set True by use of the configuration pragma Suppress_Exception_Messages
1706 Extensions_Allowed_Config : Boolean;
1708 -- This is the flag that indicates whether extensions are allowed. It can
1709 -- be set True either by use of the -gnatX switch, or by use of the
1710 -- configuration pragma Extensions_Allowed (On). It is always set to True
1711 -- for internal GNAT units, since extensions are always permitted in such
1714 External_Name_Exp_Casing_Config : External_Casing_Type;
1716 -- This is the value of the configuration switch that controls casing of
1717 -- external symbols for which an explicit external name is given. It can be
1718 -- set to Uppercase by the command line switch -gnatF, and further modified
1719 -- by the use of the configuration pragma External_Name_Casing in the
1720 -- gnat.adc file. This flag is used to set the initial value for
1721 -- External_Name_Exp_Casing at the start of analyzing each unit. Note
1722 -- however that the setting of this flag is ignored for internal and
1723 -- predefined units (which are always compiled with As_Is mode).
1725 External_Name_Imp_Casing_Config : External_Casing_Type;
1727 -- This is the value of the configuration switch that controls casing of
1728 -- external symbols where the external name is implicitly given. It can be
1729 -- set to Uppercase by the command line switch -gnatF, and further modified
1730 -- by the use of the configuration pragma External_Name_Casing in the
1731 -- gnat.adc file. This flag is used to set the initial value for
1732 -- External_Name_Imp_Casing at the start of analyzing each unit. Note
1733 -- however that the setting of this flag is ignored for internal and
1734 -- predefined units (which are always compiled with Lowercase mode).
1736 Fast_Math_Config : Boolean;
1738 -- This is the value of the configuration switch that controls Fast_Math
1739 -- mode, as set by a Fast_Math pragma in configuration pragmas. It is
1740 -- used to set the initial value of Fast_Math at the start of each new
1741 -- compilation unit.
1743 Initialize_Scalars_Config : Boolean;
1745 -- This is the value of the configuration switch that is set by the
1746 -- pragma Initialize_Scalars when it appears in the gnat.adc file.
1747 -- This switch is not set when the pragma appears ahead of a given
1748 -- unit, so it does not affect the compilation of other units.
1750 Optimize_Alignment_Config : Character;
1752 -- This is the value of the configuration switch that controls the
1753 -- alignment optimization mode, as set by an Optimize_Alignment pragma.
1754 -- It is used to set the initial value of Optimize_Alignment at the start
1755 -- of each new compilation unit, except that it is always set to 'O' (off)
1756 -- for internal units.
1758 Persistent_BSS_Mode_Config : Boolean;
1760 -- This is the value of the configuration switch that controls whether
1761 -- potentially persistent data is to be placed in the persistent_bss
1762 -- section. It can be set True by use of the pragma Persistent_BSS.
1763 -- This flag is used to set the initial value of Persistent_BSS_Mode
1764 -- at the start of each compilation unit, except that it is always
1765 -- set False for predefined units.
1767 Polling_Required_Config : Boolean;
1769 -- This is the value of the configuration switch that controls polling
1770 -- mode. It can be set True by the command line switch -gnatP, and then
1771 -- further modified by the use of pragma Polling in the gnat.adc file. This
1772 -- flag is used to set the initial value for Polling_Required at the start
1773 -- of analyzing each unit.
1775 Short_Descriptors_Config : Boolean;
1777 -- This is the value of the configuration switch that controls the use of
1778 -- Short_Descriptors for setting descriptor default sizes. It can be set
1779 -- True by the use of the pragma Short_Descriptors in the gnat.adc file.
1780 -- This flag is used to set the initial value for Short_Descriptors at the
1781 -- start of analyzing each unit.
1783 Use_VADS_Size_Config : Boolean;
1785 -- This is the value of the configuration switch that controls the use of
1786 -- VADS_Size instead of Size wherever the attribute Size is used. It can
1787 -- be set True by the use of the pragma Use_VADS_Size in the gnat.adc file.
1788 -- This flag is used to set the initial value for Use_VADS_Size at the
1789 -- start of analyzing each unit. Note however that the setting of this flag
1790 -- is ignored for internal and predefined units (which are always compiled
1791 -- with the standard Size semantics).
1793 type Config_Switches_Type is private;
1794 -- Type used to save values of the switches set from Config values
1796 procedure Save_Opt_Config_Switches (Save : out Config_Switches_Type);
1797 -- This procedure saves the current values of the switches which are
1798 -- initialized from the above Config values, and then resets these switches
1799 -- according to the Config value settings.
1801 procedure Set_Opt_Config_Switches
1802 (Internal_Unit : Boolean;
1803 Main_Unit : Boolean);
1804 -- This procedure sets the switches to the appropriate initial values. The
1805 -- parameter Internal_Unit is True for an internal or predefined unit, and
1806 -- affects the way the switches are set (see above). Main_Unit is true if
1807 -- switches are being set for the main unit (this affects setting of the
1808 -- assert/debug pragma switches, which are normally set false by default
1809 -- for an internal unit, except when the internal unit is the main unit,
1810 -- in which case we use the command line settings).
1812 procedure Restore_Opt_Config_Switches (Save : Config_Switches_Type);
1813 -- This procedure restores a set of switch values previously saved by a
1814 -- call to Save_Opt_Switches.
1816 procedure Register_Opt_Config_Switches;
1817 -- This procedure is called after processing the gnat.adc file and other
1818 -- configuration pragma files to record the values of the Config switches,
1819 -- as possibly modified by the use of command line switches and pragmas
1820 -- appearing in these files.
1822 ------------------------
1823 -- Other Global Flags --
1824 ------------------------
1826 Expander_Active : Boolean := False;
1827 -- A flag that indicates if expansion is active (True) or deactivated
1828 -- (False). When expansion is deactivated all calls to expander routines
1829 -- have no effect. Note that the initial setting of False is merely to
1830 -- prevent saving of an undefined value for an initial call to the
1831 -- Expander_Mode_Save_And_Set procedure. For more information on the use of
1832 -- this flag, see package Expander. Indeed this flag might more logically
1833 -- be in the spec of Expander, but it is referenced by Errout, and it
1834 -- really seems wrong for Errout to depend on Expander.
1836 -- Note: for many purposes, it is more appropriate to test the flag
1837 -- Full_Expander_Active, which also checks that Alfa mode is not active.
1839 Static_Dispatch_Tables : Boolean := True;
1840 -- This flag indicates if the backend supports generation of statically
1841 -- allocated dispatch tables. If it is True, then the front end will
1842 -- generate static aggregates for dispatch tables that contain forward
1843 -- references to addresses of subprograms not seen yet, and the back end
1844 -- must be prepared to handle this case. If it is False, then the front
1845 -- end generates assignments to initialize the dispatch table, and there
1846 -- are no such forward references. By default we build statically allocated
1847 -- dispatch tables for all library level tagged types in all platforms.This
1848 -- behavior can be disabled using switch -gnatd.t which will set this flag
1849 -- to False and revert to the previous dynamic behavior.
1851 -----------------------
1852 -- Tree I/O Routines --
1853 -----------------------
1855 procedure Tree_Read;
1856 -- Reads switch settings from current tree file using Tree_Read
1858 procedure Tree_Write;
1859 -- Writes out switch settings to current tree file using Tree_Write
1861 --------------------------
1862 -- ASIS Version Control --
1863 --------------------------
1865 -- These two variables (Tree_Version_String and Tree_ASIS_Version_Number)
1866 -- are supposed to be used in the GNAT/ASIS version check performed in
1867 -- the ASIS code (this package is also a part of the ASIS implementation).
1868 -- They are set by Tree_Read procedure, so they represent the version
1869 -- number (and the version string) of the compiler which has created the
1870 -- tree, and they are supposed to be compared with the corresponding values
1871 -- from the Tree_IO and Gnatvsn packages which also are a part of ASIS
1874 Tree_Version_String : String_Access;
1875 -- Used to store the compiler version string read from a tree file to check
1876 -- if it is from the same date as stored in the version string in Gnatvsn.
1877 -- We require that ASIS Pro can be used only with GNAT Pro, but we allow
1878 -- non-Pro ASIS and ASIS-based tools to be used with any version of the
1879 -- GNAT compiler. Therefore, we need the possibility to compare the dates
1880 -- of the corresponding source sets, using version strings that may be
1881 -- of different lengths.
1883 Tree_ASIS_Version_Number : Int;
1884 -- Used to store the ASIS version number read from a tree file to check if
1885 -- it is the same as stored in the ASIS version number in Tree_IO.
1887 -----------------------------------
1888 -- Modes for Formal Verification --
1889 -----------------------------------
1891 Alfa_Mode : Boolean := False;
1892 -- Specific compiling mode targeting formal verification through the
1893 -- generation of Why code for those parts of the input code that belong to
1894 -- the Alfa subset of Ada. Set by debug flag -gnatd.F.
1896 Strict_Alfa_Mode : Boolean := False;
1897 -- Interpret compiler permissions as strictly as possible. E.g. base ranges
1898 -- for integers are limited to the strict minimum with this option. Set by
1899 -- debug flag -gnatd.D.
1901 function Full_Expander_Active return Boolean;
1902 pragma Inline (Full_Expander_Active);
1903 -- Returns the value of (Expander_Active and not Alfa_Mode). This "flag"
1904 -- indicates that expansion is fully active, that is, not in the reduced
1905 -- mode for Alfa (True) or that expansion is either deactivated, or active
1906 -- in the reduced mode for Alfa (False). For more information on full
1907 -- expansion, see package Expander. For more information on reduced
1908 -- Alfa expansion, see package Exp_Alfa.
1912 -- The following type is used to save and restore settings of switches in
1913 -- Opt that represent the configuration (i.e. result of config pragmas).
1915 -- Note that Ada_Version_Explicit is not included, since this is a sticky
1916 -- flag that once set does not get reset, since the whole idea of this flag
1917 -- is to record the setting for the main unit.
1919 type Config_Switches_Type is record
1920 Ada_Version : Ada_Version_Type;
1921 Ada_Version_Explicit : Ada_Version_Type;
1922 Assertions_Enabled : Boolean;
1923 Assume_No_Invalid_Values : Boolean;
1924 Check_Policy_List : Node_Id;
1925 Debug_Pragmas_Disabled : Boolean;
1926 Debug_Pragmas_Enabled : Boolean;
1927 Default_Pool : Node_Id;
1928 Dynamic_Elaboration_Checks : Boolean;
1929 Exception_Locations_Suppressed : Boolean;
1930 Extensions_Allowed : Boolean;
1931 External_Name_Exp_Casing : External_Casing_Type;
1932 External_Name_Imp_Casing : External_Casing_Type;
1933 Fast_Math : Boolean;
1934 Initialize_Scalars : Boolean;
1935 Normalize_Scalars : Boolean;
1936 Optimize_Alignment : Character;
1937 Optimize_Alignment_Local : Boolean;
1938 Persistent_BSS_Mode : Boolean;
1939 Polling_Required : Boolean;
1940 Short_Descriptors : Boolean;
1941 Use_VADS_Size : Boolean;
1944 -- The following declarations are for GCC version dependent flags. We do
1945 -- not let client code in the compiler test GCC_Version directly, but
1946 -- instead use deferred constants for relevant feature tags.
1948 -- Note: there currently are no such constants defined in this section,
1949 -- since the compiler front end is currently entirely independent of the
1950 -- GCC version, which is a desirable state of affairs.
1952 function get_gcc_version return Int;
1953 pragma Import (C, get_gcc_version, "get_gcc_version");
1955 GCC_Version : constant Nat := get_gcc_version;
1957 -- Indicates which version of gcc is in use (3 = 3.x, 4 = 4.x). Note that
1958 -- gcc 2.8.1 (which used to be a value of 2) is no longer supported.
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