1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2012, 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. Modified by use of
180 Address_Is_Private : Boolean := False;
182 -- Set True if package System has the line "type Address is private;"
184 All_Errors_Mode : Boolean := False;
186 -- Flag set to force display of multiple errors on a single line and
187 -- also repeated error messages for references to undefined identifiers
188 -- and certain other repeated error messages. Set by use of -gnatf.
190 All_Sources : Boolean := False;
192 -- Set to True to require all source files to be present. This flag is
193 -- directly modified by gnatmake to affect the shared binder routines.
195 Alternate_Main_Name : String_Ptr := null;
197 -- Set to non null when Bind_Alternate_Main_Name is True. This value
198 -- is modified as needed by Gnatbind.Scan_Bind_Arg.
200 ASIS_Mode : Boolean := False;
202 -- Enable semantic checks and tree transformations that are important
203 -- for ASIS but that are usually skipped if Operating_Mode is set to
204 -- Check_Semantics. This flag does not have the corresponding option to set
205 -- it ON. It is set ON when Tree_Output is set ON, it can also be set ON
206 -- from the code of GNSA-based tool (a client may need to set ON the
207 -- Back_Annotate_Rep_Info flag in this case. At the moment this does not
208 -- make very much sense, because GNSA cannot do back annotation).
210 Assertions_Enabled : Boolean := False;
212 -- Enable assertions made using pragma Assert
214 Assume_No_Invalid_Values : Boolean := False;
215 -- GNAT Normally, in accordance with (RM 13.9.1 (9-11)) the front end
216 -- assumes that values could have invalid representations, unless it can
217 -- clearly prove that the values are valid. If this switch is set (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 if/case expressions to make
234 -- sure that no copy occurs. If the flag is True, then the expansion for
235 -- if and case 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). This is
238 -- used to test the possibility of having the backend handle this.
240 Bind_Alternate_Main_Name : Boolean := False;
242 -- True if main should be called Alternate_Main_Name.all.
243 -- This variable may be set to True by Gnatbind.Scan_Bind_Arg.
245 Bind_Main_Program : Boolean := True;
247 -- Set to False if not binding main Ada program
249 Bind_For_Library : Boolean := False;
251 -- Set to True if the binder needs to generate a file designed for building
252 -- a library. May be set to True by Gnatbind.Scan_Bind_Arg.
254 Bind_Only : Boolean := False;
255 -- GNATMAKE, GPRMAKE, GPRBUILD
256 -- Set to True to skip compile and link steps
257 -- (except when Compile_Only and/or Link_Only are True).
259 Blank_Deleted_Lines : Boolean := False;
261 -- Output empty lines for each line of preprocessed input that is deleted
262 -- in the output, including preprocessor lines starting with a '#'.
264 Brief_Output : Boolean := False;
266 -- Force brief error messages to standard error, even if verbose mode is
267 -- set (so that main error messages go to standard output).
269 Build_Bind_And_Link_Full_Project : Boolean := False;
271 -- Set to True to build, bind and link all the sources of a project file
274 Check_Aliasing_Of_Parameters : Boolean := False;
276 -- Set to True to detect whether subprogram parameters and function results
277 -- alias the same object(s).
279 Check_Float_Overflow : Boolean := False;
281 -- Set to True to check that operations on predefined unconstrained float
282 -- types (e.g. Float, Long_Float) do not overflow and generate infinities
283 -- or invalid values. Set by the Check_Float_Overflow pragma, or by use
284 -- of the -gnateo switch.
286 Check_Object_Consistency : Boolean := False;
287 -- GNATBIND, GNATMAKE
288 -- Set to True to check whether every object file is consistent with
289 -- its corresponding ada library information (ALI) file. An object
290 -- file is inconsistent with the corresponding ALI file if the object
291 -- file does not exist or if it has an older time stamp than the ALI file.
292 -- Default above is for GNATBIND. GNATMAKE overrides this default to
293 -- True (see Make.Initialize) since we normally do need to check source
294 -- consistencies in gnatmake.
296 Check_Only : Boolean := False;
298 -- Set to True to do checks only, no output of binder file
300 Check_Policy_List : Node_Id := Empty;
302 -- This points to the list of N_Pragma nodes for Check_Policy pragmas
303 -- that are linked through the Next_Pragma fields, with the list being
304 -- terminated by Empty. The order is most recently processed first. Note
305 -- that Push_Scope and Pop_Scope in Sem_Ch8 save and restore the value
306 -- of this variable, implementing the required scope control for pragmas
307 -- appearing a declarative part.
309 Check_Readonly_Files : Boolean := False;
311 -- Set to True to check readonly files during the make process
313 Check_Source_Files : Boolean := True;
314 -- GNATBIND, GNATMAKE
315 -- Set to True to enable consistency checking for any source files that
316 -- are present (i.e. date must match the date in the library info file).
317 -- Set to False for object file consistency check only. This flag is
318 -- directly modified by gnatmake, to affect the shared binder routines.
320 Check_Switches : Boolean := False;
321 -- GNATMAKE, GPRMAKE, GPBUILD
322 -- Set to True to check compiler options during the make process
324 Check_Unreferenced : Boolean := False;
326 -- Set to True to enable checking for unreferenced entities other
327 -- than formal parameters (for which see Check_Unreferenced_Formals)
328 -- Modified by use of -gnatwu/U.
330 Check_Unreferenced_Formals : Boolean := False;
332 -- Set to True to check for unreferenced formals. This is turned on by
333 -- -gnatwa/wf/wu and turned off by -gnatwA/wF/wU.
335 Check_Validity_Of_Parameters : Boolean := False;
337 -- Set to True to check for proper scalar initialization of subprogram
338 -- parameters on both entry and exit. Turned on by??? turned off by???
340 Check_Withs : Boolean := False;
342 -- Set to True to enable checking for unused withs, and also the case
343 -- of withing a package and using none of the entities in the package.
344 -- Modified by use of -gnatwu/U.
346 CodePeer_Mode : Boolean := False;
348 -- Enable full CodePeer mode (SCIL generation, disable switches that
349 -- interact badly with it, etc...).
351 Commands_To_Stdout : Boolean := False;
353 -- True if echoed commands to be written to stdout instead of stderr
355 Comment_Deleted_Lines : Boolean := False;
357 -- True if source lines removed by the preprocessor should be commented
358 -- in the output file.
360 Compile_Only : Boolean := False;
361 -- GNATMAKE, GNATCLEAN, GPRMAKE, GPBUILD, GPRCLEAN
362 -- GNATMAKE, GPRMAKE, GPRMAKE:
363 -- set to True to skip bind and link steps (except when Bind_Only is
365 -- GNATCLEAN, GPRCLEAN:
366 -- set to True to delete only the files produced by the compiler but not
367 -- the library files or the executable files.
369 Config_File : Boolean := True;
371 -- Set to False to inhibit reading and processing of gnat.adc file
373 Config_File_Names : String_List_Access := null;
375 -- Names of configuration pragmas files (given by switches -gnatec)
377 Configurable_Run_Time_Mode : Boolean := False;
379 -- Set True if the compiler is operating in configurable run-time mode.
380 -- This happens if the flag Targparm.Configurable_Run_TimeMode_On_Target
381 -- is set True, or if pragma No_Run_Time is used. See the spec of Rtsfind
382 -- for details on the handling of the latter pragma.
384 Constant_Condition_Warnings : Boolean := False;
386 -- Set to True to activate warnings on constant conditions. Modified by
389 Create_Mapping_File : Boolean := False;
391 -- Set to True (-C switch) to indicate that the compiler will be invoked
392 -- with a mapping file (-gnatem compiler switch).
394 Debug_Pragmas_Enabled : Boolean := False;
396 -- Enable debug statements from pragma Debug
398 Debug_Pragmas_Disabled : Boolean := False;
400 -- Debug pragmas completely disabled (no semantic checking)
402 subtype Debug_Level_Value is Nat range 0 .. 3;
403 Debugger_Level : Debug_Level_Value := 0;
405 -- The value given to the -g parameter. The default value for -g with
406 -- no value is 2. This is usually ignored by GNATBIND, except in the
407 -- VMS version where it is passed as an argument to __gnat_initialize
408 -- to trigger the activation of the remote debugging interface.
409 -- Is this still true ???
411 Debug_Generated_Code : Boolean := False;
413 -- Set True (-gnatD switch) to debug generated expanded code instead
414 -- of the original source code. Causes debugging information to be
415 -- written with respect to the generated code file that is written.
417 Default_Exit_Status : Int := 0;
419 -- Set the default exit status value. Set by the -Xnnn switch for the
422 Default_Stack_Size : Int := -1;
424 -- Set to default primary stack size in units of bytes. Set by
425 -- the -dnnn switch for the binder. A value of -1 indicates that no
426 -- default was set by the binder.
428 Default_Sec_Stack_Size : Int := -1;
430 -- Set to default secondary stack size in units of bytes. Set by
431 -- the -Dnnn switch for the binder. A value of -1 indicates that no
432 -- default was set by the binder, and that the default should be the
433 -- initial value of System.Secondary_Stack.Default_Secondary_Stack_Size.
435 Default_Pool : Node_Id := Empty;
437 -- Used to record the storage pool name (or null literal) that is the
438 -- argument of an applicable pragma Default_Storage_Pool.
439 -- Empty: No pragma Default_Storage_Pool applies.
440 -- N_Null node: "pragma Default_Storage_Pool (null);" applies.
441 -- otherwise: "pragma Default_Storage_Pool (X);" applies, and
442 -- this points to the name X.
443 -- Push_Scope and Pop_Scope in Sem_Ch8 save and restore this value.
445 Detect_Blocking : Boolean := False;
447 -- Set True to force the run time to raise Program_Error if calls to
448 -- potentially blocking operations are detected from protected actions.
450 Display_Compilation_Progress : Boolean := False;
451 -- GNATMAKE, GPRMAKE, GPRBUILD
452 -- Set True (-d switch) to display information on progress while compiling
453 -- files. Internal flag to be used in conjunction with an IDE (e.g GPS).
455 type Distribution_Stub_Mode_Type is
458 -- Normal mode, no generation/compilation of distribution stubs
460 Generate_Receiver_Stub_Body,
461 -- The unit being compiled is the RCI body, and the compiler will
462 -- generate the body for the receiver stubs and compile it.
464 Generate_Caller_Stub_Body);
465 -- The unit being compiled is the RCI spec, and the compiler will
466 -- generate the body for the caller stubs and compile it.
468 Distribution_Stub_Mode : Distribution_Stub_Mode_Type := No_Stubs;
470 -- This enumeration variable indicates the five states of distribution
471 -- annex stub generation/compilation.
473 Do_Not_Execute : Boolean := False;
475 -- Set to True if no actual compilations should be undertaken.
477 Dump_Source_Text : Boolean := False;
479 -- Set to True (by -gnatL) to dump source text intermingled with generated
480 -- code. Effective only if either of Debug/Print_Generated_Code is true.
482 Dynamic_Elaboration_Checks : Boolean := False;
484 -- Set True for dynamic elaboration checking mode, as set by the -gnatE
485 -- switch or by the use of pragma Elaboration_Checks (Dynamic).
487 Dynamic_Stack_Measurement : Boolean := False;
489 -- Set True to enable dynamic stack measurement (-u flag for gnatbind)
491 Dynamic_Stack_Measurement_Array_Size : Nat := 100;
493 -- Number of measurements we want to store during dynamic stack analysis.
494 -- When the buffer is full, non-storable results will be output on the fly.
495 -- The value is relevant only if Dynamic_Stack_Measurement is set. Set
496 -- by processing of -u flag for gnatbind.
498 Elab_Dependency_Output : Boolean := False;
500 -- Set to True to output complete list of elaboration constraints
502 Elab_Order_Output : Boolean := False;
504 -- Set to True to output chosen elaboration order
506 Elab_Warnings : Boolean := False;
508 -- Set to True to generate full elaboration warnings (-gnatwl)
510 Error_Msg_Line_Length : Nat := 0;
512 -- Records the error message line length limit. If this is set to zero,
513 -- then we get the old style behavior, in which each call to the error
514 -- message routines generates one line of output as a separate message.
515 -- If it is set to a non-zero value, then continuation lines are folded
516 -- to make a single long message, and then this message is split up into
517 -- multiple lines not exceeding the specified length. Set by -gnatj=nn.
519 Exception_Handler_Encountered : Boolean := False;
521 -- This flag is set true if the parser encounters an exception handler.
522 -- It is used to set Warn_On_Exception_Propagation True if the restriction
523 -- No_Exception_Propagation is set.
525 Exception_Extra_Info : Boolean := False;
527 -- True when switch -gnateE is used. When True, generate extra information
528 -- associated with exception messages (in particular range and index
531 Exception_Locations_Suppressed : Boolean := False;
533 -- Set to True if a Suppress_Exception_Locations configuration pragma is
536 type Exception_Mechanism_Type is
537 -- Determines the handling of exceptions. See Exp_Ch11 for details
539 (Front_End_Setjmp_Longjmp_Exceptions,
540 -- Exceptions use setjmp/longjmp generated explicitly by the
541 -- front end (this includes gigi or other equivalent parts of
542 -- the code generator). AT END handlers are converted into
543 -- exception handlers by the front end in this mode.
545 Back_End_Exceptions);
546 -- Exceptions are handled by the back end. The front end simply
547 -- generates the handlers as they appear in the source, and AT
548 -- END handlers are left untouched (they are not converted into
549 -- exception handlers when operating in this mode.
550 pragma Convention (C, Exception_Mechanism_Type);
552 Exception_Mechanism : Exception_Mechanism_Type :=
553 Front_End_Setjmp_Longjmp_Exceptions;
555 -- Set to the appropriate value depending on the default as given in
556 -- system.ads (ZCX_By_Default). The C convention is there to make this
557 -- variable accessible to gigi.
559 Exception_Tracebacks : Boolean := False;
561 -- Set to True to store tracebacks in exception occurrences (-E)
563 Extensions_Allowed : Boolean := False;
565 -- Set to True by switch -gnatX if GNAT specific language extensions
566 -- are allowed. Currently there are no such defined extensions.
568 type External_Casing_Type is (
569 As_Is, -- External names cased as they appear in the Ada source
570 Uppercase, -- External names forced to all uppercase letters
571 Lowercase); -- External names forced to all lowercase letters
573 External_Name_Imp_Casing : External_Casing_Type := Lowercase;
575 -- The setting of this flag determines the casing of external names
576 -- when the name is implicitly derived from an entity name (i.e. either
577 -- no explicit External_Name or Link_Name argument is used, or, in the
578 -- case of extended DEC pragmas, the external name is given using an
579 -- identifier. The As_Is setting is not permitted here (since this would
580 -- create Ada source programs that were case sensitive).
582 External_Name_Exp_Casing : External_Casing_Type := As_Is;
584 -- The setting of this flag determines the casing of an external name
585 -- specified explicitly with a string literal. As_Is means the string
586 -- literal is used as given with no modification to the casing. If
587 -- Lowercase or Uppercase is set, then the string is forced to all
588 -- lowercase or all uppercase letters as appropriate. Note that this
589 -- setting has no effect if the external name is given using an identifier
590 -- in the case of extended DEC import/export pragmas (in this case the
591 -- casing is controlled by External_Name_Imp_Casing), and also has no
592 -- effect if an explicit Link_Name is supplied (a link name is always
593 -- used exactly as given).
595 External_Unit_Compilation_Allowed : Boolean := False;
597 -- When True (set by gnatmake switch -x), allow compilation of sources
598 -- that are not part of any project file.
600 Fast_Math : Boolean := False;
602 -- Indicates the current setting of Fast_Math mode, as set by the use
603 -- of a Fast_Math pragma (set on by Fast_Math (On)).
605 Float_Format : Character := ' ';
607 -- A non-blank value indicates that a Float_Format pragma has been
608 -- processed, in which case this variable is set to 'I' for IEEE or
609 -- to 'V' for VAX. The setting of 'V' is only possible on OpenVMS
612 Float_Format_Long : Character := ' ';
614 -- A non-blank value indicates that a Long_Float pragma has been
615 -- processed (this pragma is recognized only in OpenVMS versions
616 -- of GNAT), in which case this variable is set to D or G for
617 -- D_Float or G_Float.
619 Force_ALI_Tree_File : Boolean := False;
621 -- Force generation of ALI file even if errors are encountered.
622 -- Also forces generation of tree file if -gnatt is also set.
624 Disable_ALI_File : Boolean := False;
626 -- Disable generation of ALI file
628 Force_Checking_Of_Elaboration_Flags : Boolean := False;
630 -- True if binding with forced checking of the elaboration flags
633 Force_Compilations : Boolean := False;
634 -- GNATMAKE, GPRMAKE, GPRBUILD
635 -- Set to force recompilations even when the objects are up-to-date.
637 Full_Path_Name_For_Brief_Errors : Boolean := False;
639 -- When True, in Brief_Output mode, each error message line
640 -- will start with the full path name of the source.
641 -- When False, only the file name without directory information
644 Full_List : Boolean := False;
646 -- Set True to generate full source listing with embedded errors
648 Full_List_File_Name : String_Ptr := null;
650 -- Set to file name to generate full source listing to named file (or if
651 -- the name is of the form .xxx, then to name.xxx where name is the source
652 -- file name with extension stripped.
654 Generate_Processed_File : Boolean := False;
656 -- True when switch -gnateG is used. When True, create in a file
657 -- <source>.prep, if the source is preprocessed.
659 Generate_SCO : Boolean := False;
661 -- True when switch -fdump-scos (or -gnateS) is used. When True, Source
662 -- Coverage Obligation (SCO) information is generated and output in the ALI
663 -- file. See unit Par_SCO for full details.
665 Generate_SCO_Instance_Table : Boolean := False;
667 -- True when switch -fdebug-instances is used. When True, a table of
668 -- instances is included in SCOs.
670 Generate_Target_Dependent_Info : Boolean := False;
672 -- When true (-gnatet switch used). True if target dependent info is to be
673 -- generated in the ali file.
675 Generating_Code : Boolean := False;
677 -- True if the frontend finished its work and has called the backend to
678 -- process the tree and generate the object file.
680 Global_Discard_Names : Boolean := False;
682 -- True if a pragma Discard_Names appeared as a configuration pragma for
683 -- the current compilation unit.
685 GNAT_Mode : Boolean := False;
687 -- True if compiling in GNAT system mode (-gnatg switch)
689 Heap_Size : Nat := 0;
691 -- Heap size for memory allocations. Valid values are 32 and 64. Only
694 Identifier_Character_Set : Character;
696 -- This variable indicates the character set to be used for identifiers.
697 -- The possible settings are:
698 -- '1' Latin-5 (ISO-8859-1)
699 -- '2' Latin-5 (ISO-8859-2)
700 -- '3' Latin-5 (ISO-8859-3)
701 -- '4' Latin-5 (ISO-8859-4)
702 -- '5' Latin-5 (ISO-8859-5, Cyrillic)
703 -- '9' Latin-5 (ISO-8859-9)
704 -- 'p' PC (US, IBM page 437)
705 -- '8' PC (European, IBM page 850)
706 -- 'f' Full upper set (all distinct)
707 -- 'n' No upper characters (Ada 83 rules)
708 -- 'w' Latin-1 plus wide characters allowed in identifiers
710 -- The setting affects the set of letters allowed in identifiers and the
711 -- upper/lower case equivalences. It does not affect the interpretation of
712 -- character and string literals, which are always stored using the actual
713 -- coding in the source program. This variable is initialized to the
714 -- default value appropriate to the system (in Osint.Initialize), and then
715 -- reset if a command line switch is used to change the setting.
717 Ignore_Rep_Clauses : Boolean := False;
719 -- Set True to ignore all representation clauses. Useful when compiling
720 -- code from foreign compilers for checking or ASIS purposes. Can be
721 -- set True by use of -gnatI.
723 Implementation_Unit_Warnings : Boolean := True;
725 -- Set True to active warnings for use of implementation internal units.
726 -- Modified by use of -gnatwi/-gnatwI.
728 Implicit_Packing : Boolean := False;
730 -- If set True, then a Size attribute clause on an array is allowed to
731 -- cause implicit packing instead of generating an error message. Set by
732 -- use of pragma Implicit_Packing.
734 Ineffective_Inline_Warnings : Boolean := False;
736 -- Set True to activate warnings if front-end inlining (-gnatN) is not
737 -- able to actually inline a particular call (or all calls). Can be
738 -- controlled by use of -gnatwp/-gnatwP.
740 Init_Or_Norm_Scalars : Boolean := False;
742 -- Set True if a pragma Initialize_Scalars applies to the current unit.
743 -- Also set True if a pragma Normalize_Scalars applies.
745 Initialize_Scalars : Boolean := False;
747 -- Set True if a pragma Initialize_Scalars applies to the current unit.
748 -- Note that Init_Or_Norm_Scalars is also set to True if this is True.
750 Initialize_Scalars_Mode1 : Character := 'I';
751 Initialize_Scalars_Mode2 : Character := 'N';
753 -- Set to two characters from -S switch (IN/LO/HI/EV/xx). The default
754 -- is IN (invalid values), used if no -S switch is used.
756 Inline_Active : Boolean := False;
758 -- Set True to activate pragma Inline processing across modules. Default
759 -- for now is not to inline across module boundaries.
761 Inline_Level : Nat := 0;
763 -- Set to indicate the inlining level: 0 means that an appropriate value is
764 -- to be computed by the compiler based on the optimization level (-gnatn),
765 -- 1 is for moderate inlining across modules (-gnatn1) and 2 for full
766 -- inlining across modules (-gnatn2).
768 Interface_Library_Unit : Boolean := False;
770 -- Set to True to indicate that at least one ALI file is an interface ALI:
771 -- then elaboration flag checks are to be generated in the binder
774 Generate_SCIL : Boolean := False;
776 -- Set True to activate SCIL code generation.
778 Invalid_Value_Used : Boolean := False;
780 -- Set True if a valid Invalid_Value attribute is encountered
782 Follow_Links_For_Files : Boolean := False;
784 -- Set to True (-eL) to process the project files in trusted mode. If
785 -- Follow_Links is False, it is assumed that the project doesn't contain
786 -- any file duplicated through symbolic links (although the latter are
787 -- still valid if they point to a file which is outside of the project),
788 -- and that no directory has a name which is a valid source name.
790 Follow_Links_For_Dirs : Boolean := False;
792 -- Set to True if directories can be links in this project, and therefore
793 -- additional system calls must be performed to ensure that we always see
794 -- the same full name for each directory.
796 Front_End_Inlining : Boolean := False;
798 -- Set True to activate inlining by front-end expansion
800 Inline_Processing_Required : Boolean := False;
802 -- Set True if inline processing is required. Inline processing is required
803 -- if an active Inline pragma is processed. The flag is set for a pragma
804 -- Inline or Inline_Always that is actually active.
806 In_Place_Mode : Boolean := False;
808 -- Set True to store ALI and object files in place i.e. in the object
809 -- directory if these files already exist or in the source directory
812 Keep_Going : Boolean := False;
813 -- GNATMAKE, GPRMAKE, GPRBUILD
814 -- When True signals to ignore compilation errors and keep processing
815 -- sources until there is no more work.
817 Keep_Temporary_Files : Boolean := False;
819 -- When True the temporary files created by the GNAT driver are not
820 -- deleted. Set by switch -dn or qualifier /KEEP_TEMPORARY_FILES.
822 Leap_Seconds_Support : Boolean := False;
824 -- Set to True to enable leap seconds support in Ada.Calendar and its
827 Link_Only : Boolean := False;
828 -- GNATMAKE, GPRMAKE, GPRBUILD
829 -- Set to True to skip compile and bind steps (except when Bind_Only is
832 List_Inherited_Aspects : Boolean := False;
834 -- List inherited invariants, preconditions, and postconditions from
835 -- Invariant'Class, Pre'Class, and Post'Class aspects. Also list inherited
836 -- subtype predicates. Modified by use of -gnatw.l/.L.
838 List_Restrictions : Boolean := False;
840 -- Set to True to list restrictions pragmas that could apply to partition
842 List_Units : Boolean := False;
844 -- List units in the active library for a compilation (-gnatu switch)
846 List_Closure : Boolean := False;
848 -- List all sources in the closure of a main (-R gnatbind switch)
850 List_Dependencies : Boolean := False;
852 -- When True gnatmake verifies that the objects are up to date and
853 -- outputs the list of object dependencies (-M switch).
854 -- Output depends if -a switch is used or not.
855 -- This list can be used directly in a Makefile.
857 List_Representation_Info : Int range 0 .. 3 := 0;
859 -- Set non-zero by -gnatR switch to list representation information.
860 -- The settings are as follows:
862 -- 0 = no listing of representation information (default as above)
863 -- 1 = list rep info for user defined record and array types
864 -- 2 = list rep info for all user defined types and objects
865 -- 3 = like 2, but variable fields are decoded symbolically
867 List_Representation_Info_To_File : Boolean := False;
869 -- Set true by -gnatRs switch. Causes information from -gnatR/1/2/3 to be
870 -- written to file.rep (where file is the name of the source file) instead
871 -- of stdout. For example, if file x.adb is compiled using -gnatR2s then
872 -- representation info is written to x.adb.ref.
874 List_Representation_Info_Mechanisms : Boolean := False;
876 -- Set true by -gnatRm switch. Causes information on mechanisms to be
877 -- included in the representation output information.
879 List_Preprocessing_Symbols : Boolean := False;
881 -- Set to True if symbols for preprocessing a source are to be listed
882 -- before preprocessing occurs. Set to True by switch -s of gnatprep or
883 -- -s in preprocessing data file for the compiler.
885 type Create_Repinfo_File_Proc is access procedure (Src : String);
886 type Write_Repinfo_Line_Proc is access procedure (Info : String);
887 type Close_Repinfo_File_Proc is access procedure;
888 -- Types used for procedure addresses below
890 Create_Repinfo_File_Access : Create_Repinfo_File_Proc := null;
891 Write_Repinfo_Line_Access : Write_Repinfo_Line_Proc := null;
892 Close_Repinfo_File_Access : Close_Repinfo_File_Proc := null;
894 -- These three locations are left null when operating in non-compiler (e.g.
895 -- ASIS mode), but when operating in compiler mode, they are set to point
896 -- to the three corresponding procedures in Osint-C. The reason for this
897 -- slightly strange interface is to stop Repinfo from dragging in Osint in
898 -- ASIS mode, which would include lots of unwanted units in the ASIS build.
900 type Create_List_File_Proc is access procedure (S : String);
901 type Write_List_Info_Proc is access procedure (S : String);
902 type Close_List_File_Proc is access procedure;
903 -- Types used for procedure addresses below
905 Create_List_File_Access : Create_List_File_Proc := null;
906 Write_List_Info_Access : Write_List_Info_Proc := null;
907 Close_List_File_Access : Close_List_File_Proc := null;
909 -- These three locations are left null when operating in non-compiler
910 -- (e.g. from the binder), but when operating in compiler mode, they are
911 -- set to point to the three corresponding procedures in Osint-C. The
912 -- reason for this slightly strange interface is to prevent Repinfo
913 -- from dragging in Osint-C in the binder, which would include unwanted
914 -- units in the binder.
916 Locking_Policy : Character := ' ';
918 -- Set to ' ' for the default case (no locking policy specified). Reset to
919 -- first character (uppercase) of locking policy name if a valid pragma
920 -- Locking_Policy is encountered.
922 Locking_Policy_Sloc : Source_Ptr := No_Location;
924 -- Remember location of previous Locking_Policy pragma. This is used for
925 -- inconsistency error messages. A value of System_Location is used if the
926 -- policy is set in package System.
928 Look_In_Primary_Dir : Boolean := True;
929 -- GNAT, GNATBIND, GNATMAKE, GNATCLEAN
930 -- Set to False if a -I- was present on the command line. When True we are
931 -- allowed to look in the primary directory to locate other source or
934 Make_Steps : Boolean := False;
936 -- Set to True when either Compile_Only, Bind_Only or Link_Only is
939 Main_Index : Int := 0;
941 -- This is set to non-zero by gnatmake switch -eInnn to indicate that
942 -- the main program is the nnn unit in a multi-unit source file.
944 Mapping_File_Name : String_Ptr := null;
946 -- File name of mapping between unit names, file names and path names.
947 -- (given by switch -gnatem)
949 Maximum_Messages : Int := 9999;
951 -- Maximum default number of errors before compilation is terminated, or in
952 -- the case of GNAT, maximum number of warnings before further warnings are
953 -- suppressed. Can be overridden by -gnatm (GNAT) or -m (GNATBIND) switch.
955 Maximum_File_Name_Length : Int;
957 -- Maximum number of characters allowed in a file name, not counting the
958 -- extension, as set by the appropriate switch. If no switch is given,
959 -- then this value is initialized by Osint to the appropriate value.
961 Maximum_Instantiations : Int := 8000;
963 -- Maximum number of instantiations permitted (to stop runaway cases
964 -- of nested instantiations). These situations probably only occur in
965 -- specially concocted test cases. Can be modified by -gnateinn switch.
967 Maximum_Processes : Positive := 1;
968 -- GNATMAKE, GPRMAKE, GPRBUILD
969 -- Maximum number of processes that should be spawned to carry out
972 Minimal_Recompilation : Boolean := False;
974 -- Set to True if minimal recompilation mode requested
976 Multiple_Unit_Index : Int;
978 -- This is set non-zero if the current unit is being compiled in multiple
979 -- unit per file mode, meaning that the current unit is selected from the
980 -- sequence of units in the current source file, using the value stored
981 -- in this variable (e.g. 2 = select second unit in file). A value of
982 -- zero indicates that we are in normal (one unit per file) mode.
984 No_Deletion : Boolean := False;
986 -- Set by preprocessor switch -a. Do not eliminate any source text. Implies
987 -- Undefined_Symbols_Are_False. Useful to perform a syntax check on all
988 -- branches of #if constructs.
990 No_Main_Subprogram : Boolean := False;
991 -- GNATMAKE, GNATBIND
992 -- Set to True if compilation/binding of a program without main
993 -- subprogram requested.
995 No_Run_Time_Mode : Boolean := False;
997 -- This flag is set True if a No_Run_Time pragma is encountered. See
998 -- spec of Rtsfind for a full description of handling of this pragma.
1000 No_Split_Units : Boolean := False;
1002 -- Set to True with switch --no-split-units. When True, unit sources, spec,
1003 -- body and subunits, must all be in the same project.This is checked after
1004 -- each compilation.
1006 No_Stdinc : Boolean := False;
1007 -- GNAT, GNATBIND, GNATMAKE, GNATFIND, GNATXREF
1008 -- Set to True if no default source search dirs added to search list
1010 No_Stdlib : Boolean := False;
1011 -- GNATMAKE, GNATBIND, GNATFIND, GNATXREF
1012 -- Set to True if no default library search dirs added to search list
1014 No_Strict_Aliasing : Boolean := False;
1016 -- Set True if pragma No_Strict_Aliasing with no parameters encountered
1018 Normalize_Scalars : Boolean := False;
1020 -- Set True if a pragma Normalize_Scalars applies to the current unit.
1021 -- Note that Init_Or_Norm_Scalars is also set to True if this is True.
1023 Object_Directory_Present : Boolean := False;
1025 -- Set to True when an object directory is specified with option -D
1027 Object_Path_File_Name : String_Ptr := null;
1029 -- Path of the temporary file that contains a list of object directories
1030 -- passed by -gnateO=<obj_path_file>.
1032 One_Compilation_Per_Obj_Dir : Boolean := False;
1033 -- GNATMAKE, GPRBUILD
1034 -- Set to True with switch --single-compile-per-obj-dir. When True, there
1035 -- cannot be simultaneous compilations with the object files in the same
1036 -- object directory, if project files are used.
1038 type Operating_Mode_Type is (Check_Syntax, Check_Semantics, Generate_Code);
1039 Operating_Mode : Operating_Mode_Type := Generate_Code;
1041 -- Indicates the operating mode of the compiler. The default is generate
1042 -- code, which runs the parser, semantics and backend. Switches can be
1043 -- used to set syntax checking only mode, or syntax and semantics checking
1044 -- only mode. Operating_Mode can also be modified as a result of detecting
1045 -- errors during the compilation process. In particular if any serious
1046 -- error is detected then this flag is reset from Generate_Code to
1047 -- Check_Semantics after generating an error message.
1049 Optimize_Alignment : Character := 'O';
1050 -- Setting of Optimize_Alignment, set to T/S/O for time/space/off. Can
1051 -- be modified by use of pragma Optimize_Alignment.
1053 Optimize_Alignment_Local : Boolean := False;
1054 -- Set True if Optimize_Alignment mode is set by a local configuration
1055 -- pragma that overrides the gnat.adc (or other configuration file) default
1056 -- so that the unit is not dependent on the default setting. Also always
1057 -- set True for internal units, since these always have a default setting
1058 -- of Optimize_Alignment (Off) that is enforced (essentially equivalent to
1059 -- them all having such an explicit pragma in each unit).
1061 Original_Operating_Mode : Operating_Mode_Type := Generate_Code;
1063 -- Indicates the original operating mode of the compiler as set by compiler
1064 -- options. This is identical to Operating_Mode except that this is not
1065 -- affected by errors.
1067 Optimization_Level : Int;
1068 pragma Import (C, Optimization_Level, "optimize");
1069 -- Constant reflecting the optimization level (0,1,2,3 for -O0,-O1,-O2,-O3)
1070 -- See jmissing.c and aamissing.c for definitions for dotnet/jgnat and
1071 -- GNAAMP back ends.
1073 Optimize_Size : Int;
1074 pragma Import (C, Optimize_Size, "optimize_size");
1075 -- Constant reflecting setting of -Os (optimize for size). Set to nonzero
1076 -- in -Os mode and set to zero otherwise. See jmissing.c and aamissing.c
1077 -- for definitions of "optimize_size" for dotnet/jgnat and GNAAMP backends
1079 Output_File_Name_Present : Boolean := False;
1080 -- GNATBIND, GNAT, GNATMAKE, GPRMAKE
1081 -- Set to True when the output C file name is given with option -o for
1082 -- GNATBIND, when the object file name is given with option -gnatO for GNAT
1083 -- or when the executable is given with option -o for GNATMAKE or GPRMAKE.
1085 Output_Linker_Option_List : Boolean := False;
1087 -- True if output of list of linker options is requested (-K switch set)
1089 Output_ALI_List : Boolean := False;
1090 ALI_List_Filename : String_Ptr;
1092 -- True if output of list of ALIs is requested (-A switch set). List is
1093 -- output under the given filename, or standard output if not specified.
1095 Output_Object_List : Boolean := False;
1096 Object_List_Filename : String_Ptr;
1098 -- True if output of list of objects is requested (-O switch set). List is
1099 -- output under the given filename, or standard output if not specified.
1101 Partition_Elaboration_Policy : Character := ' ';
1103 -- Set to ' ' for the default case (no elaboration policy specified). Reset
1104 -- to first character (uppercase) of locking policy name if a valid pragma
1105 -- Partition_Elaboration_Policy is encountered.
1107 Partition_Elaboration_Policy_Sloc : Source_Ptr := No_Location;
1109 -- Remember location of previous Partition_Elaboration_Policy pragma. This
1110 -- is used for inconsistency error messages. A value of System_Location is
1111 -- used if the policy is set in package System.
1113 Persistent_BSS_Mode : Boolean := False;
1115 -- True if a Persistent_BSS configuration pragma is in effect, causing
1116 -- potentially persistent data to be placed in the persistent_bss section.
1118 Pessimistic_Elab_Order : Boolean := False;
1120 -- True if pessimistic elaboration order is to be chosen (-p switch set)
1122 Polling_Required : Boolean := False;
1124 -- Set to True if polling for asynchronous abort is enabled by using
1125 -- the -gnatP option for GNAT.
1127 Preprocessing_Data_File : String_Ptr := null;
1129 -- Set by switch -gnatep=. The file name of the preprocessing data file.
1131 Preprocessing_Symbol_Defs : String_List_Access := new String_List (1 .. 4);
1132 -- An extensible array to temporarily stores symbol definitions specified
1133 -- on the command line with -gnateD switches.
1134 -- What is this magic constant 4 ???
1135 -- What is extensible about this fixed length array ???
1137 Preprocessing_Symbol_Last : Natural := 0;
1138 -- Index of last symbol definition in array Symbol_Definitions
1140 Print_Generated_Code : Boolean := False;
1142 -- Set to True to enable output of generated code in source form. This
1143 -- flag is set by the -gnatG switch.
1145 Print_Standard : Boolean := False;
1147 -- Set to true to enable printing of package standard in source form.
1148 -- This flag is set by the -gnatS switch
1150 Propagate_Exceptions : Boolean := False;
1152 -- Indicates if subprogram descriptor exception tables should be
1153 -- built for imported subprograms. Set True if a Propagate_Exceptions
1154 -- pragma applies to the extended main unit.
1156 type Usage is (Unknown, Not_In_Use, In_Use);
1157 Project_File_In_Use : Usage := Unknown;
1159 -- Indicates if a project file is used or not. Set to In_Use by the first
1162 Queuing_Policy : Character := ' ';
1164 -- Set to ' ' for the default case (no queuing policy specified). Reset to
1165 -- first character (uppercase) of locking policy name if a valid
1166 -- Queuing_Policy pragma is encountered.
1168 Queuing_Policy_Sloc : Source_Ptr := No_Location;
1170 -- Remember location of previous Queuing_Policy pragma. This is used for
1171 -- inconsistency error messages. A value of System_Location is used if the
1172 -- policy is set in package System.
1174 Quiet_Output : Boolean := False;
1175 -- GNATMAKE, GNATCLEAN, GPRMAKE, GPRBUILD, GPRCLEAN
1176 -- Set to True if the tool should not have any output if there are no
1177 -- errors or warnings.
1179 Replace_In_Comments : Boolean := False;
1181 -- Set to True if -C switch used
1183 RTS_Lib_Path_Name : String_Ptr := null;
1184 RTS_Src_Path_Name : String_Ptr := null;
1186 -- Set to the "adalib" and "adainclude" directories of the run time
1187 -- specified by --RTS=.
1189 RTS_Switch : Boolean := False;
1190 -- GNAT, GNATMAKE, GNATBIND, GNATLS, GNATFIND, GNATXREF
1191 -- Set to True when the --RTS switch is set
1193 Run_Path_Option : Boolean := True;
1194 -- GNATMAKE, GNATLINK
1195 -- Set to False when no run_path_option should be issued to the linker
1197 Search_Directory_Present : Boolean := False;
1199 -- Set to True when argument is -I. Reset to False when next argument, a
1200 -- search directory path is taken into account. Note that this is quite
1201 -- different from other switches in this section in that it is only set in
1202 -- a transitory manner as a result of scanning a -I switch with no file
1203 -- name, and if set, is an indication that the next argument is to be
1204 -- treated as a file name.
1206 Sec_Stack_Used : Boolean := False;
1208 -- Set True if generated code uses the System.Secondary_Stack package. For
1209 -- the binder, set if any unit uses the secondary stack package.
1211 Setup_Projects : Boolean := False;
1213 -- Set to True for GNAT SETUP: the Project Manager creates non existing
1214 -- object, library and exec directories.
1216 Shared_Libgnat : Boolean;
1218 -- Set to True if a shared libgnat is requested by using the -shared option
1219 -- for GNATBIND and to False when using the -static option. The value of
1220 -- this flag is set by Gnatbind.Scan_Bind_Arg.
1222 Short_Circuit_And_Or : Boolean := False;
1224 -- Set True if a pragma Short_Circuit_And_Or applies to the current unit.
1226 Short_Descriptors : Boolean := False;
1228 -- Set True if a pragma Short_Descriptors applies to the current unit.
1230 Special_Exception_Package_Used : Boolean := False;
1232 -- Set to True if either of the unit GNAT.Most_Recent_Exception or
1233 -- GNAT.Exception_Traces is with'ed. Used to inhibit transformation of
1234 -- local raise statements into gotos in the presence of either package.
1236 Sprint_Line_Limit : Nat := 72;
1238 -- Limit values for chopping long lines in Sprint output, can be reset
1239 -- by use of NNN parameter with -gnatG or -gnatD switches.
1241 Stack_Checking_Enabled : Boolean;
1243 -- Set to indicate if -fstack-check switch is set for the compilation. True
1244 -- means that the switch is set, so that stack checking is enabled. False
1245 -- means that the switch is not set (no stack checking). This value is
1246 -- obtained from the external imported value flag_stack_check in the gcc
1247 -- backend (see Frontend) and may be referenced throughout the compilation
1250 Style_Check : Boolean := False;
1252 -- Set True to perform style checks. Activates checks carried out in
1253 -- package Style (see body of this package for details of checks). This
1254 -- flag is set True by either the -gnatg or -gnaty switches.
1256 Suppress_All_Inlining : Boolean := False;
1258 -- Set by -fno-inline. Suppresses all inlining, both front end and back end
1259 -- regardless of any other switches that are set.
1261 Suppress_Control_Flow_Optimizations : Boolean := False;
1263 -- Set by -fpreserve-control-flow. Suppresses control flow optimizations
1264 -- that interfere with coverage analysis based on the object code.
1266 System_Extend_Pragma_Arg : Node_Id := Empty;
1268 -- Set non-empty if and only if a correct Extend_System pragma was present
1269 -- in which case it points to the argument of the pragma, and the name can
1270 -- be located as Chars (Expression (System_Extend_Pragma_Arg)).
1272 System_Extend_Unit : Node_Id := Empty;
1274 -- This is set to Empty if GNAT_Mode is set, since pragma Extend_System
1275 -- is never appropriate in GNAT_Mode (and causes troubles, including
1276 -- bogus circularities, if we try to compile the run-time library with
1277 -- a System extension). If GNAT_Mode is not set, then System_Extend_Unit
1278 -- is a copy of the value set in System_Extend_Pragma_Arg.
1280 Subunits_Missing : Boolean := False;
1282 -- This flag is set true if missing subunits are detected with code
1283 -- generation active. This causes code generation to be skipped.
1285 Suppress_Checks : Boolean := False;
1287 -- Set to True if -gnatp (suppress all checks) switch present.
1289 Suppress_Options : Suppress_Record;
1291 -- Indicates outer level setting of check suppression. This initializes
1292 -- the settings of the outer scope level in any unit compiled. This is
1293 -- initialized by Osint.Initialize, and further initialized by the
1294 -- Adjust_Global_Switches flag in Gnat1drv.
1296 Suppress_Back_Annotation : Boolean := False;
1298 -- This flag is set True if back annotation of representation information
1299 -- is to be suppressed. This is set if neither -gnatt or -gnatR0-3 is set.
1300 -- This avoids unnecessary time being spent on back annotation.
1302 Table_Factor : Int := 1;
1304 -- Factor by which all initial table sizes set in Alloc are multiplied.
1305 -- Used in Table to calculate initial table sizes (the initial table size
1306 -- is the value in Alloc, used as the Table_Initial parameter value,
1307 -- multiplied by the factor given here. The default value is used if no
1308 -- -gnatT switch appears.
1310 Tagged_Type_Expansion : Boolean := True;
1312 -- Set True if tagged types and interfaces should be expanded by the
1313 -- front-end. If False, the original tree is left unexpanded for tagged
1314 -- types and dispatching calls, assuming the underlying target supports
1315 -- it (e.g. in the JVM case).
1317 Task_Dispatching_Policy : Character := ' ';
1319 -- Set to ' ' for the default case (no task dispatching policy specified).
1320 -- Reset to first character (uppercase) of task dispatching policy name
1321 -- if a valid Task_Dispatching_Policy pragma is encountered.
1323 Task_Dispatching_Policy_Sloc : Source_Ptr := No_Location;
1325 -- Remember location of previous Task_Dispatching_Policy pragma. This is
1326 -- used for inconsistency error messages. A value of System_Location is
1327 -- used if the policy is set in package System.
1329 Tasking_Used : Boolean := False;
1330 -- Set True if any tasking construct is encountered. Used to activate the
1331 -- output of the Q, L and T lines in ALI files.
1333 Time_Slice_Set : Boolean := False;
1335 -- Set True if a pragma Time_Slice is processed in the main unit, or
1336 -- if the -gnatTnn switch is present to set a time slice value.
1338 Time_Slice_Value : Nat;
1340 -- Time slice value. Valid only if Time_Slice_Set is True, i.e. if
1341 -- Time_Slice pragma has been processed. Set to the time slice value in
1342 -- microseconds. Negative values are stored as zero, and the value is not
1343 -- larger than 1_000_000_000 (1000 seconds). Values larger than this are
1344 -- reset to this maximum. This can also be set with the -gnatTnn switch.
1346 Tolerate_Consistency_Errors : Boolean := False;
1348 -- Tolerate time stamp and other consistency errors. If this flag is set to
1349 -- True (-t), then inconsistencies result in warnings rather than errors.
1351 Treat_Categorization_Errors_As_Warnings : Boolean := False;
1352 -- Normally categorization errors are true illegalities. If this switch
1353 -- is set, then such errors result in warning messages rather than error
1354 -- messages. Set True by -gnateP (P for Pure/Preelaborate).
1356 Treat_Restrictions_As_Warnings : Boolean := False;
1358 -- Set True to treat pragma Restrictions as Restriction_Warnings. Set by
1361 Tree_Output : Boolean := False;
1363 -- Set to True (-gnatt) to generate output tree file
1365 True_VMS_Target : Boolean := False;
1366 -- Set True if we are on a VMS target. The setting of this flag reflects
1367 -- the true state of the compile, unlike Targparm.OpenVMS_On_Target which
1368 -- can also be true when debug flag m is set (-gnatdm). This is used in the
1369 -- few cases where we do NOT want -gnatdm to trigger the VMS behavior.
1371 Try_Semantics : Boolean := False;
1373 -- Flag set to force attempt at semantic analysis, even if parser errors
1374 -- occur. This will probably cause blowups at this stage in the game. On
1375 -- the other hand, most such blowups will be caught cleanly and simply
1376 -- say compilation abandoned. This flag is set to True by -gnatq or -gnatQ.
1378 Unchecked_Shared_Lib_Imports : Boolean := False;
1380 -- Set to True when shared library projects are allowed to import projects
1381 -- that are not shared library projects. Set by switch
1382 -- --unchecked-shared-lib-imports.
1384 Undefined_Symbols_Are_False : Boolean := False;
1386 -- Set to True by switch -u of gnatprep or -u in the preprocessing data
1387 -- file for the compiler. Indicates that while preprocessing sources,
1388 -- symbols that are not defined have the value FALSE.
1390 Unique_Error_Tag : Boolean := Tag_Errors;
1392 -- Indicates if error messages are to be prefixed by the string error:
1393 -- Initialized from Tag_Errors, can be forced on with the -gnatU switch.
1395 Universal_Addressing_On_AAMP : Boolean := False;
1397 -- Indicates if library-level objects should be accessed and updated using
1398 -- universal addressing instructions on the AAMP architecture. This flag is
1399 -- set to True when pragma Universal_Data is given as a configuration
1402 Unreserve_All_Interrupts : Boolean := False;
1404 -- Normally set False, set True if a valid Unreserve_All_Interrupts pragma
1405 -- appears anywhere in the main unit for GNAT, or if any ALI file has the
1406 -- corresponding attribute set in GNATBIND.
1408 Upper_Half_Encoding : Boolean := False;
1410 -- Normally set False, indicating that upper half ISO 8859-1 characters are
1411 -- used in the normal way to represent themselves. If the wide character
1412 -- encoding method uses the upper bit for this encoding, then this flag is
1413 -- set True, and upper half characters in the source indicate the start of
1414 -- a wide character sequence. Set by -gnatW or -W switches.
1416 Use_Include_Path_File : Boolean := False;
1417 -- GNATMAKE, GPRBUILD
1418 -- When True, create a source search path file, even when a mapping file
1421 Usage_Requested : Boolean := False;
1422 -- GNAT, GNATBIND, GNATMAKE
1423 -- Set to True if -h (-gnath for the compiler) switch encountered
1424 -- requesting usage information
1426 Use_Expression_With_Actions : Boolean;
1427 -- The N_Expression_With_Actions node has been introduced relatively
1428 -- recently, and not all back ends are prepared to handle it yet. So
1429 -- we use this flag to suppress its use during a transitional period.
1430 -- Currently the default is False for all cases (set in gnat1drv).
1431 -- The default can be modified using -gnatd.X/-gnatd.Y.
1433 Use_Pragma_Linker_Constructor : Boolean := False;
1435 -- True if pragma Linker_Constructor applies to adainit
1437 Use_VADS_Size : Boolean := False;
1439 -- Set to True if a valid pragma Use_VADS_Size is processed
1441 Validity_Checks_On : Boolean := True;
1443 -- This flag determines if validity checking is on or off. The initial
1444 -- state is on, and the required default validity checks are active. The
1445 -- actual set of checks that is performed if Validity_Checks_On is set is
1446 -- defined by the switches in package Validsw. The Validity_Checks_On flag
1447 -- is controlled by pragma Validity_Checks (On | Off), and also some
1448 -- generated compiler code (typically code that has to do with validity
1449 -- check generation) is compiled with this flag set to False. This flag is
1450 -- set to False by the -gnatp switch.
1452 Verbose_Mode : Boolean := False;
1453 -- GNAT, GNATBIND, GNATMAKE, GNATLINK, GNATLS, GNATNAME, GNATCLEAN,
1454 -- GPRMAKE, GPRBUILD, GPRCLEAN
1455 -- Set to True to get verbose mode (full error message text and location
1456 -- information sent to standard output, also header, copyright and summary)
1458 type Verbosity_Level_Type is (None, Low, Medium, High);
1459 pragma Ordered (Verbosity_Level_Type);
1460 Verbosity_Level : Verbosity_Level_Type := High;
1461 -- GNATMAKE, GPRMAKE
1462 -- Modified by gnatmake or gprmake switches -v, -vl, -vm, -vh. Indicates
1463 -- the level of verbosity of informational messages:
1465 -- In Low Verbosity, the reasons why a source is recompiled, the name
1466 -- of the executable and the reason it must be rebuilt is output.
1468 -- In Medium Verbosity, additional lines are output for each ALI file
1471 -- In High Verbosity, additional lines are output when the ALI file
1472 -- is part of an Ada library, is read-only or is part of the runtime.
1474 Warn_On_Ada_2005_Compatibility : Boolean := True;
1476 -- Set to True to generate all warnings on Ada 2005 compatibility issues,
1477 -- including warnings on Ada 2005 obsolescent features used in Ada 2005
1478 -- mode. Set by default, modified by use of -gnatwy/Y.
1480 Warn_On_Ada_2012_Compatibility : Boolean := True;
1482 -- Set to True to generate all warnings on Ada 2012 compatibility issues,
1483 -- including warnings on Ada 2012 obsolescent features used in Ada 2012
1484 -- mode. Modified by use of -gnatwy/Y.
1486 Warn_On_All_Unread_Out_Parameters : Boolean := False;
1488 -- Set to True to generate warnings in all cases where a variable is
1489 -- modified by being passed as to an OUT formal, but the resulting value is
1490 -- never read. The default is that this warning is suppressed. Modified
1491 -- by use of gnatw.o/.O.
1493 Warn_On_Assertion_Failure : Boolean := True;
1495 -- Set to True to activate warnings on assertions that can be determined
1496 -- at compile time will always fail. Modified by use of -gnatw.a/.A.
1498 Warn_On_Assumed_Low_Bound : Boolean := True;
1500 -- Set to True to activate warnings for string parameters that are indexed
1501 -- with literals or S'Length, presumably assuming a lower bound of one.
1502 -- Modified by use of -gnatww/W.
1504 Warn_On_Atomic_Synchronization : Boolean := False;
1506 -- Set to True to generate information messages for atomic synchronization.
1507 -- Modified by use of -gnatw.n/.N.
1509 Warn_On_Bad_Fixed_Value : Boolean := False;
1511 -- Set to True to generate warnings for static fixed-point expression
1512 -- values that are not an exact multiple of the small value of the type.
1513 -- Odd by default, modified by use of -gnatwb/B.
1515 Warn_On_Biased_Representation : Boolean := True;
1517 -- Set to True to generate warnings for size clauses, component clauses
1518 -- and component_size clauses that force biased representation. Modified
1519 -- by use of -gnatw.b/.B.
1521 Warn_On_Constant : Boolean := False;
1523 -- Set to True to generate warnings for variables that could be declared
1524 -- as constants. Modified by use of -gnatwk/K.
1526 Warn_On_Deleted_Code : Boolean := False;
1528 -- Set to True to generate warnings for code deleted by the front end
1529 -- for conditional statements whose outcome is known at compile time.
1530 -- Modified by use of -gnatwt/T.
1532 Warn_On_Dereference : Boolean := False;
1534 -- Set to True to generate warnings for implicit dereferences for array
1535 -- indexing and record component access. Modified by use of -gnatwd/D.
1537 Warn_On_Export_Import : Boolean := True;
1539 -- Set to True to generate warnings for suspicious use of export or
1540 -- import pragmas. Modified by use of -gnatwx/X.
1542 Warn_On_Hiding : Boolean := False;
1544 -- Set to True to generate warnings if a declared entity hides another
1545 -- entity. The default is that this warning is suppressed. Modified by
1546 -- use of -gnatwh/H.
1548 Warn_On_Modified_Unread : Boolean := False;
1550 -- Set to True to generate warnings if a variable is assigned but is never
1551 -- read. Also controls warnings for similar cases involving out parameters,
1552 -- but only if there is only one out parameter for the procedure involved.
1553 -- The default is that this warning is suppressed, modified by use of
1556 Warn_On_No_Value_Assigned : Boolean := True;
1558 -- Set to True to generate warnings if no value is ever assigned to a
1559 -- variable that is at least partially uninitialized. Set to false to
1560 -- suppress such warnings. The default is that such warnings are enabled.
1561 -- Modified by use of -gnatwv/V.
1563 Warn_On_Non_Local_Exception : Boolean := False;
1565 -- Set to True to generate warnings for non-local exception raises and also
1566 -- handlers that can never handle a local raise. This warning is only ever
1567 -- generated if pragma Restrictions (No_Exception_Propagation) is set. The
1568 -- default is not to generate the warnings except that if the source has
1569 -- at least one exception handler, and this restriction is set, and the
1570 -- warning was not explicitly turned off, then it is turned on by default.
1571 -- Modified by use of -gnatw.x/.X.
1573 No_Warn_On_Non_Local_Exception : Boolean := False;
1575 -- This is set to True if the above warning is explicitly suppressed. We
1576 -- use this to avoid turning it on by default when No_Exception_Propagation
1577 -- restriction is set and an exception handler is present.
1579 Warn_On_Object_Renames_Function : Boolean := False;
1581 -- Set to True to generate warnings when a function result is renamed as
1582 -- an object. The default is that this warning is disabled. Modified by
1583 -- use of -gnatw.r/.R.
1585 Warn_On_Obsolescent_Feature : Boolean := False;
1587 -- Set to True to generate warnings on use of any feature in Annex or if a
1588 -- subprogram is called for which a pragma Obsolescent applies. Modified
1589 -- by use of -gnatwj/J.
1591 Warn_On_Overlap : Boolean := False;
1593 -- Set to True to generate warnings when a writable actual which is not
1594 -- a by-copy type overlaps with another actual in a subprogram call.
1595 -- Modified by use of -gnatw.i/.I.
1597 Warn_On_Questionable_Missing_Parens : Boolean := True;
1599 -- Set to True to generate warnings for cases where parentheses are missing
1600 -- and the usage is questionable, because the intent is unclear. On by
1601 -- default, modified by use of -gnatwq/Q.
1603 Warn_On_Parameter_Order : Boolean := False;
1605 -- Set to True to generate warnings for cases where the argument list for
1606 -- a call is a sequence of identifiers that match the formal identifiers,
1607 -- but are in the wrong order.
1609 Warn_On_Redundant_Constructs : Boolean := False;
1611 -- Set to True to generate warnings for redundant constructs (e.g. useless
1612 -- assignments/conversions). The default is that this warning is disabled.
1613 -- Modified by use of -gnatwr/R.
1615 Warn_On_Reverse_Bit_Order : Boolean := True;
1617 -- Set to True to generate warning (informational) messages for component
1618 -- clauses that are affected by non-standard bit-order. The default is
1619 -- that this warning is enabled. Modified by -gnatw.v/.V.
1621 Warn_On_Suspicious_Contract : Boolean := False;
1623 -- Set to True to generate warnings for suspicious contracts expressed as
1624 -- pragmas or aspects precondition and postcondition. The default is that
1625 -- this warning is disabled. Modified by use of -gnatw.t/.T.
1627 Warn_On_Suspicious_Modulus_Value : Boolean := True;
1629 -- Set to True to generate warnings for suspicious modulus values. The
1630 -- default is that this warning is enabled. Modified by -gnatw.m/.M.
1632 Warn_On_Unchecked_Conversion : Boolean := True;
1634 -- Set to True to generate warnings for unchecked conversions that may have
1635 -- non-portable semantics (e.g. because sizes of types differ). Modified
1636 -- by use of -gnatwz/Z.
1638 Warn_On_Unordered_Enumeration_Type : Boolean := False;
1640 -- Set to True to generate warnings for inappropriate uses (comparisons
1641 -- and explicit ranges) on unordered enumeration types (which includes
1642 -- all enumeration types for which pragma Ordered is not given). The
1643 -- default is that this warning is disabled. Modified by -gnat.u/.U.
1645 Warn_On_Unrecognized_Pragma : Boolean := True;
1647 -- Set to True to generate warnings for unrecognized pragmas. The default
1648 -- is that this warning is enabled. Modified by use of -gnatwg/G.
1650 Warn_On_Unrepped_Components : Boolean := False;
1652 -- Set to True to generate warnings for the case of components of record
1653 -- which have a record representation clause but this component does not
1654 -- have a component clause. Modified by use of -gnatw.c/.C.
1656 Warn_On_Warnings_Off : Boolean := False;
1658 -- Set to True to generate warnings for use of Pragma Warnings (Off, ent),
1659 -- where either the pragma is never used, or it could be replaced by a
1660 -- pragma Unmodified or Unreferenced. Modified by use of -gnatw.w/.W.
1662 type Warning_Mode_Type is (Suppress, Normal, Treat_As_Error);
1663 Warning_Mode : Warning_Mode_Type := Normal;
1665 -- Controls treatment of warning messages. If set to Suppress, warning
1666 -- messages are not generated at all. In Normal mode, they are generated
1667 -- but do not count as errors. In Treat_As_Error mode, warning messages
1668 -- are generated and are treated as errors.
1670 Wide_Character_Encoding_Method : WC_Encoding_Method := WCEM_Brackets;
1672 -- Method used for encoding wide characters in the source program. See
1673 -- description of type in unit System.WCh_Con for a list of the methods
1674 -- that are currently supported. Note that brackets notation is always
1675 -- recognized in source programs regardless of the setting of this
1676 -- variable. The default setting causes only the brackets notation to be
1677 -- recognized. If this is the main unit, this setting also controls the
1678 -- output of the W=? parameter in the ALI file, which is used to provide
1679 -- the default for encoding [Wide_[Wide_]]Text_IO files. For the binder,
1680 -- the value set here overrides this main unit default.
1682 Wide_Character_Encoding_Method_Specified : Boolean := False;
1684 -- Set True if the value in Wide_Character_Encoding_Method was set as
1685 -- a result of an explicit -gnatW? or -W? switch. False otherwise.
1687 Xref_Active : Boolean := True;
1689 -- Set if cross-referencing is enabled (i.e. xref info in ALI files)
1691 Zero_Formatting : Boolean := False;
1693 -- Do no formatting (no title, no leading spaces, no empty lines) in
1694 -- auxiliary outputs (-e, -K, -l, -R).
1696 ----------------------------
1697 -- Configuration Settings --
1698 ----------------------------
1700 -- These are settings that are used to establish the mode at the start of
1701 -- each unit. The values defined below can be affected either by command
1702 -- line switches, or by the use of appropriate configuration pragmas in a
1703 -- configuration pragma file.
1705 Ada_Version_Config : Ada_Version_Type;
1707 -- This is the value of the configuration switch for the Ada 83 mode, as
1708 -- set by the command line switches -gnat83/95/05, and possibly modified by
1709 -- the use of configuration pragmas Ada_*. This switch is used to set the
1710 -- initial value for Ada_Version mode at the start of analysis of a unit.
1711 -- Note however that the setting of this flag is ignored for internal and
1712 -- predefined units (which are always compiled in the most up to date
1715 Ada_Version_Explicit_Config : Ada_Version_Type;
1717 -- This is set in the same manner as Ada_Version_Config. The difference is
1718 -- that the setting of this flag is not ignored for internal and predefined
1719 -- units, which for some purposes do indeed access this value, regardless
1720 -- of the fact that they are compiled the most up to date ada version).
1722 Assertions_Enabled_Config : Boolean;
1724 -- This is the value of the configuration switch for assertions enabled
1725 -- mode, as possibly set by the command line switch -gnata, and possibly
1726 -- modified by the use of the configuration pragma Assertion_Policy.
1728 Assume_No_Invalid_Values_Config : Boolean;
1730 -- This is the value of the configuration switch for assuming "no invalid
1731 -- values enabled" mode, as possibly set by the command line switch
1732 -- -gnatB, and possibly modified by the use of the configuration pragma
1733 -- Assume_No_Invalid_Values.
1735 Check_Float_Overflow_Config : Boolean;
1737 -- Set to True to check that operations on predefined unconstrained float
1738 -- types (e.g. Float, Long_Float) do not overflow and generate infinities
1739 -- or invalid values. Set by the Check_Float_Overflow pragma, or by use
1740 -- of the -gnateo switch.
1742 Check_Policy_List_Config : Node_Id;
1744 -- This points to the list of N_Pragma nodes for Check_Policy pragmas
1745 -- that are linked through the Next_Pragma fields, with the list being
1746 -- terminated by Empty. The order is most recently processed first. This
1747 -- list includes only those pragmas in configuration pragma files.
1749 Debug_Pragmas_Disabled_Config : Boolean;
1751 -- This is the value of the configuration switch for debug pragmas disabled
1752 -- mode, as possibly set by use of the configuration pragma Debug_Policy.
1754 Debug_Pragmas_Enabled_Config : Boolean;
1756 -- This is the value of the configuration switch for debug pragmas enabled
1757 -- mode, as possibly set by the command line switch -gnata and possibly
1758 -- modified by the use of the configuration pragma Debug_Policy.
1760 Default_Pool_Config : Node_Id := Empty;
1762 -- Same as Default_Pool above, except this is only for Default_Storage_Pool
1763 -- pragmas that are configuration pragmas.
1765 Dynamic_Elaboration_Checks_Config : Boolean := False;
1767 -- Set True for dynamic elaboration checking mode, as set by the -gnatE
1768 -- switch or by the use of pragma Elaboration_Checking (Dynamic).
1770 Exception_Locations_Suppressed_Config : Boolean := False;
1772 -- Set True by use of the configuration pragma Suppress_Exception_Messages
1774 Extensions_Allowed_Config : Boolean;
1776 -- This is the flag that indicates whether extensions are allowed. It can
1777 -- be set True either by use of the -gnatX switch, or by use of the
1778 -- configuration pragma Extensions_Allowed (On). It is always set to True
1779 -- for internal GNAT units, since extensions are always permitted in such
1782 External_Name_Exp_Casing_Config : External_Casing_Type;
1784 -- This is the value of the configuration switch that controls casing of
1785 -- external symbols for which an explicit external name is given. It can be
1786 -- set to Uppercase by the command line switch -gnatF, and further modified
1787 -- by the use of the configuration pragma External_Name_Casing in the
1788 -- gnat.adc file. This flag is used to set the initial value for
1789 -- External_Name_Exp_Casing at the start of analyzing each unit. Note
1790 -- however that the setting of this flag is ignored for internal and
1791 -- predefined units (which are always compiled with As_Is mode).
1793 External_Name_Imp_Casing_Config : External_Casing_Type;
1795 -- This is the value of the configuration switch that controls casing of
1796 -- external symbols where the external name is implicitly given. It can be
1797 -- set to Uppercase by the command line switch -gnatF, and further modified
1798 -- by the use of the configuration pragma External_Name_Casing in the
1799 -- gnat.adc file. This flag is used to set the initial value for
1800 -- External_Name_Imp_Casing at the start of analyzing each unit. Note
1801 -- however that the setting of this flag is ignored for internal and
1802 -- predefined units (which are always compiled with Lowercase mode).
1804 Fast_Math_Config : Boolean;
1806 -- This is the value of the configuration switch that controls Fast_Math
1807 -- mode, as set by a Fast_Math pragma in configuration pragmas. It is
1808 -- used to set the initial value of Fast_Math at the start of each new
1809 -- compilation unit.
1811 Initialize_Scalars_Config : Boolean;
1813 -- This is the value of the configuration switch that is set by the
1814 -- pragma Initialize_Scalars when it appears in the gnat.adc file.
1815 -- This switch is not set when the pragma appears ahead of a given
1816 -- unit, so it does not affect the compilation of other units.
1818 Optimize_Alignment_Config : Character;
1820 -- This is the value of the configuration switch that controls the
1821 -- alignment optimization mode, as set by an Optimize_Alignment pragma.
1822 -- It is used to set the initial value of Optimize_Alignment at the start
1823 -- of each new compilation unit, except that it is always set to 'O' (off)
1824 -- for internal units.
1826 Persistent_BSS_Mode_Config : Boolean;
1828 -- This is the value of the configuration switch that controls whether
1829 -- potentially persistent data is to be placed in the persistent_bss
1830 -- section. It can be set True by use of the pragma Persistent_BSS.
1831 -- This flag is used to set the initial value of Persistent_BSS_Mode
1832 -- at the start of each compilation unit, except that it is always
1833 -- set False for predefined units.
1835 Polling_Required_Config : Boolean;
1837 -- This is the value of the configuration switch that controls polling
1838 -- mode. It can be set True by the command line switch -gnatP, and then
1839 -- further modified by the use of pragma Polling in the gnat.adc file. This
1840 -- flag is used to set the initial value for Polling_Required at the start
1841 -- of analyzing each unit.
1843 Short_Descriptors_Config : Boolean;
1845 -- This is the value of the configuration switch that controls the use of
1846 -- Short_Descriptors for setting descriptor default sizes. It can be set
1847 -- True by the use of the pragma Short_Descriptors in the gnat.adc file.
1848 -- This flag is used to set the initial value for Short_Descriptors at the
1849 -- start of analyzing each unit.
1851 Use_VADS_Size_Config : Boolean;
1853 -- This is the value of the configuration switch that controls the use of
1854 -- VADS_Size instead of Size wherever the attribute Size is used. It can
1855 -- be set True by the use of the pragma Use_VADS_Size in the gnat.adc file.
1856 -- This flag is used to set the initial value for Use_VADS_Size at the
1857 -- start of analyzing each unit. Note however that the setting of this flag
1858 -- is ignored for internal and predefined units (which are always compiled
1859 -- with the standard Size semantics).
1861 type Config_Switches_Type is private;
1862 -- Type used to save values of the switches set from Config values
1864 procedure Save_Opt_Config_Switches (Save : out Config_Switches_Type);
1865 -- This procedure saves the current values of the switches which are
1866 -- initialized from the above Config values, and then resets these switches
1867 -- according to the Config value settings.
1869 procedure Set_Opt_Config_Switches
1870 (Internal_Unit : Boolean;
1871 Main_Unit : Boolean);
1872 -- This procedure sets the switches to the appropriate initial values. The
1873 -- parameter Internal_Unit is True for an internal or predefined unit, and
1874 -- affects the way the switches are set (see above). Main_Unit is true if
1875 -- switches are being set for the main unit (this affects setting of the
1876 -- assert/debug pragma switches, which are normally set false by default
1877 -- for an internal unit, except when the internal unit is the main unit,
1878 -- in which case we use the command line settings).
1880 procedure Restore_Opt_Config_Switches (Save : Config_Switches_Type);
1881 -- This procedure restores a set of switch values previously saved by a
1882 -- call to Save_Opt_Switches.
1884 procedure Register_Opt_Config_Switches;
1885 -- This procedure is called after processing the gnat.adc file and other
1886 -- configuration pragma files to record the values of the Config switches,
1887 -- as possibly modified by the use of command line switches and pragmas
1888 -- appearing in these files.
1890 ------------------------
1891 -- Other Global Flags --
1892 ------------------------
1894 Expander_Active : Boolean := False;
1895 -- A flag that indicates if expansion is active (True) or deactivated
1896 -- (False). When expansion is deactivated all calls to expander routines
1897 -- have no effect. Note that the initial setting of False is merely to
1898 -- prevent saving of an undefined value for an initial call to the
1899 -- Expander_Mode_Save_And_Set procedure. For more information on the use of
1900 -- this flag, see package Expander. Indeed this flag might more logically
1901 -- be in the spec of Expander, but it is referenced by Errout, and it
1902 -- really seems wrong for Errout to depend on Expander.
1904 -- Note: for many purposes, it is more appropriate to test the flag
1905 -- Full_Expander_Active, which also checks that Alfa mode is not active.
1907 Static_Dispatch_Tables : Boolean := True;
1908 -- This flag indicates if the backend supports generation of statically
1909 -- allocated dispatch tables. If it is True, then the front end will
1910 -- generate static aggregates for dispatch tables that contain forward
1911 -- references to addresses of subprograms not seen yet, and the back end
1912 -- must be prepared to handle this case. If it is False, then the front
1913 -- end generates assignments to initialize the dispatch table, and there
1914 -- are no such forward references. By default we build statically allocated
1915 -- dispatch tables for all library level tagged types in all platforms.This
1916 -- behavior can be disabled using switch -gnatd.t which will set this flag
1917 -- to False and revert to the previous dynamic behavior.
1919 -----------------------
1920 -- Tree I/O Routines --
1921 -----------------------
1923 procedure Tree_Read;
1924 -- Reads switch settings from current tree file using Tree_Read
1926 procedure Tree_Write;
1927 -- Writes out switch settings to current tree file using Tree_Write
1929 --------------------------
1930 -- ASIS Version Control --
1931 --------------------------
1933 -- These two variables (Tree_Version_String and Tree_ASIS_Version_Number)
1934 -- are supposed to be used in the GNAT/ASIS version check performed in
1935 -- the ASIS code (this package is also a part of the ASIS implementation).
1936 -- They are set by Tree_Read procedure, so they represent the version
1937 -- number (and the version string) of the compiler which has created the
1938 -- tree, and they are supposed to be compared with the corresponding values
1939 -- from the Tree_IO and Gnatvsn packages which also are a part of ASIS
1942 Tree_Version_String : String_Access;
1943 -- Used to store the compiler version string read from a tree file to check
1944 -- if it is from the same date as stored in the version string in Gnatvsn.
1945 -- We require that ASIS Pro can be used only with GNAT Pro, but we allow
1946 -- non-Pro ASIS and ASIS-based tools to be used with any version of the
1947 -- GNAT compiler. Therefore, we need the possibility to compare the dates
1948 -- of the corresponding source sets, using version strings that may be
1949 -- of different lengths.
1951 Tree_ASIS_Version_Number : Int;
1952 -- Used to store the ASIS version number read from a tree file to check if
1953 -- it is the same as stored in the ASIS version number in Tree_IO.
1955 -----------------------------------
1956 -- Modes for Formal Verification --
1957 -----------------------------------
1959 Alfa_Mode : Boolean := False;
1960 -- Specific compiling mode targeting formal verification through the
1961 -- generation of Why code for those parts of the input code that belong to
1962 -- the Alfa subset of Ada. Set by debug flag -gnatd.F.
1964 Strict_Alfa_Mode : Boolean := False;
1965 -- Interpret compiler permissions as strictly as possible. E.g. base ranges
1966 -- for integers are limited to the strict minimum with this option. Set by
1967 -- debug flag -gnatd.D.
1969 Formal_Extensions : Boolean := False;
1970 -- When this flag is set, new aspects/pragmas/attributes are accepted,
1971 -- whose main purpose is to facilitate formal verification. Set by debug
1974 function Full_Expander_Active return Boolean;
1975 pragma Inline (Full_Expander_Active);
1976 -- Returns the value of (Expander_Active and not Alfa_Mode). This "flag"
1977 -- indicates that expansion is fully active, that is, not in the reduced
1978 -- mode for Alfa (True) or that expansion is either deactivated, or active
1979 -- in the reduced mode for Alfa (False). For more information on full
1980 -- expansion, see package Expander. For more information on reduced
1981 -- Alfa expansion, see package Exp_Alfa.
1985 -- The following type is used to save and restore settings of switches in
1986 -- Opt that represent the configuration (i.e. result of config pragmas).
1988 -- Note that Ada_Version_Explicit is not included, since this is a sticky
1989 -- flag that once set does not get reset, since the whole idea of this flag
1990 -- is to record the setting for the main unit.
1992 type Config_Switches_Type is record
1993 Ada_Version : Ada_Version_Type;
1994 Ada_Version_Explicit : Ada_Version_Type;
1995 Assertions_Enabled : Boolean;
1996 Assume_No_Invalid_Values : Boolean;
1997 Check_Float_Overflow : Boolean;
1998 Check_Policy_List : Node_Id;
1999 Debug_Pragmas_Disabled : Boolean;
2000 Debug_Pragmas_Enabled : Boolean;
2001 Default_Pool : Node_Id;
2002 Dynamic_Elaboration_Checks : Boolean;
2003 Exception_Locations_Suppressed : Boolean;
2004 Extensions_Allowed : Boolean;
2005 External_Name_Exp_Casing : External_Casing_Type;
2006 External_Name_Imp_Casing : External_Casing_Type;
2007 Fast_Math : Boolean;
2008 Initialize_Scalars : Boolean;
2009 Normalize_Scalars : Boolean;
2010 Optimize_Alignment : Character;
2011 Optimize_Alignment_Local : Boolean;
2012 Persistent_BSS_Mode : Boolean;
2013 Polling_Required : Boolean;
2014 Short_Descriptors : Boolean;
2015 Use_VADS_Size : Boolean;
2018 -- The following declarations are for GCC version dependent flags. We do
2019 -- not let client code in the compiler test GCC_Version directly, but
2020 -- instead use deferred constants for relevant feature tags.
2022 -- Note: there currently are no such constants defined in this section,
2023 -- since the compiler front end is currently entirely independent of the
2024 -- GCC version, which is a desirable state of affairs.
2026 function get_gcc_version return Int;
2027 pragma Import (C, get_gcc_version, "get_gcc_version");
2029 GCC_Version : constant Nat := get_gcc_version;
2031 -- Indicates which version of gcc is in use (3 = 3.x, 4 = 4.x). Note that
2032 -- gcc 2.8.1 (which used to be a value of 2) is no longer supported.