1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2020, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING3. If not, go to --
19 -- http://www.gnu.org/licenses for a complete copy of the license. --
21 -- GNAT was originally developed by the GNAT team at New York University. --
22 -- Extensive contributions were provided by Ada Core Technologies Inc. --
24 ------------------------------------------------------------------------------
26 -- This package contains global flags set by the initialization routine from
27 -- the command line and referenced throughout the compiler, the binder, or
28 -- other GNAT tools. The comments indicate which options are used by which
29 -- programs (GNAT, GNATBIND, GNATLINK, GNATMAKE, etc).
31 -- Some flags are labelled "PROJECT MANAGER". These are used by tools that
32 -- use the Project Manager. These tools include gnatmake, gnatname, the gnat
33 -- driver, gnatclean, gprbuild and gprclean.
35 with Hostparm; use Hostparm;
36 with Types; use Types;
38 pragma Warnings (Off);
39 -- This package is used also by gnatcoll
40 with System.Strings; use System.Strings;
41 with System.WCh_Con; use System.WCh_Con;
46 ----------------------
47 -- Checksum Control --
48 ----------------------
50 -- Checksums are computed for sources to check for sources being the same
51 -- from a compilation point of view (e.g. spelling of identifiers and
52 -- white space layout do not count in this computation).
54 Checksum_Accumulate_Limited_Checksum : Boolean := False;
55 -- Used to control the computation of the limited view of a package.
56 -- (Not currently used, possible optimization for ALI files of units
57 -- in limited with_clauses).
59 ----------------------------------------------
60 -- Settings of Modes for Current Processing --
61 ----------------------------------------------
63 -- The following mode values represent the current state of processing.
64 -- The values set here are the default values. Unless otherwise noted,
65 -- the value may be reset in Switch-? with an appropriate switch. In
66 -- some cases, the values can also be modified by pragmas, and in the
67 -- case of some binder variables, Gnatbind.Scan_Bind_Arg may modify
68 -- the default values.
70 Latest_Ada_Only : Boolean := False;
71 -- If True, the only value valid for Ada_Version is Ada_Version_Type'Last,
72 -- trying to specify other values will be ignored (in case of pragma
73 -- Ada_xxx) or generate an error (in case of -gnat83/95/xx switches).
75 type Ada_Version_Type is (Ada_83, Ada_95, Ada_2005, Ada_2012, Ada_2020);
76 pragma Ordered (Ada_Version_Type);
77 pragma Convention (C, Ada_Version_Type);
78 -- Versions of Ada for Ada_Version below. Note that these are ordered,
79 -- so that tests like Ada_Version >= Ada_95 are legitimate and useful.
80 -- Think twice before using "="; Ada_Version >= Ada_2012 is more likely
81 -- what you want, because it will apply to future versions of the language.
83 -- WARNING: There is a matching C declaration of this type in fe.h
85 Ada_Version_Default : constant Ada_Version_Type := Ada_2012;
86 pragma Warnings (Off, Ada_Version_Default);
88 -- Default Ada version if no switch given. The Warnings off is to kill
89 -- constant condition warnings.
91 Ada_Version : Ada_Version_Type := Ada_Version_Default;
93 -- Current Ada version for compiler, as set by configuration pragmas,
94 -- compiler switches, or implicitly (to Ada_Version_Runtime) when a
95 -- predefined or internal file is compiled.
97 -- WARNING: There is a matching C declaration of this variable in fe.h
99 Ada_Version_Pragma : Node_Id := Empty;
100 -- Reflects the Ada_xxx pragma that resulted in setting Ada_Version. Used
101 -- to specialize error messages complaining about the Ada version in use.
103 Ada_Version_Explicit : Ada_Version_Type := Ada_Version_Default;
105 -- Like Ada_Version, but does not get set implicitly for predefined or
106 -- internal units, so it reflects the Ada version explicitly set using
107 -- configuration pragmas or compiler switches (or if neither appears, it
108 -- remains set to Ada_Version_Default). This is used in the rare cases
109 -- (notably pragma Obsolescent) where we want the explicit version set.
111 Ada_Version_Runtime : Ada_Version_Type := Ada_2020;
113 -- Ada version used to compile the runtime. Used to set Ada_Version (but
114 -- not Ada_Version_Explicit) when compiling predefined or internal units.
116 Ada_Final_Suffix : constant String := "final";
117 Ada_Final_Name : String_Ptr := new String'("ada" & Ada_Final_Suffix);
119 -- The name of the procedure that performs the finalization at the end of
120 -- execution. This variable may be modified by Gnatbind.Scan_Bind_Arg.
122 Ada_Init_Suffix : constant String := "init";
123 Ada_Init_Name : String_Ptr := new String'("ada" & Ada_Init_Suffix);
125 -- The name of the procedure that performs initialization at the start
126 -- of execution. This variable may be modified by Gnatbind.Scan_Bind_Arg.
128 Ada_Main_Name_Suffix : constant String := "main";
130 -- The suffix for Ada_Main_Name. Defined as a constant here so that it
131 -- can be referenced in a uniform manner to create either the default
132 -- value of Ada_Main_Name (declared below), or the non-default name
133 -- set by Gnatbind.Scan_Bind_Arg.
135 Ada_Main_Name : String_Ptr := new String'("ada_" & Ada_Main_Name_Suffix);
137 -- The name of the Ada package generated by the binder (when in Ada mode).
138 -- This variable may be modified by Gnatbind.Scan_Bind_Arg.
140 Address_Clause_Overlay_Warnings : Boolean := True;
142 -- Set False to disable address clause warnings. Modified by use of
145 Address_Is_Private : Boolean := False;
147 -- Set True if package System has the line "type Address is private;"
149 Aggregate_Individually_Assign : Boolean := False;
151 -- Set True if record aggregates are to be always converted into assignment
152 -- statements. Set through the corresponding pragma.
154 All_Errors_Mode : Boolean := False;
156 -- Flag set to force display of multiple errors on a single line and
157 -- also repeated error messages for references to undefined identifiers
158 -- and certain other repeated error messages. Set by use of -gnatf.
160 Allow_Integer_Address : Boolean := False;
162 -- Allow use of integer expression in a context requiring System.Address.
163 -- Set by the use of configuration pragma Allow_Integer_Address. Also set
164 -- in relaxed semantics mode for use by CodePeer or when -gnatd.M is used.
166 All_Sources : Boolean := False;
168 -- Set to True to require all source files to be present. This flag is
169 -- directly modified by gnatmake to affect the shared binder routines.
171 Alternate_Main_Name : String_Ptr := null;
173 -- Set to non-null when Bind_Alternate_Main_Name is True. This value
174 -- is modified as needed by Gnatbind.Scan_Bind_Arg.
176 Assertions_Enabled : Boolean := False;
178 -- Indicates default policy (True = Check, False = Ignore) to be applied
179 -- to all assertion aspects and pragmas, and to pragma Debug, if there is
180 -- no overriding Assertion_Policy, Check_Policy, or Debug_Policy pragma.
181 -- Set True by use of -gnata.
183 Assume_No_Invalid_Values : Boolean := False;
184 -- GNAT Normally, in accordance with (RM 13.9.1 (9-11)) the front end
185 -- assumes that values could have invalid representations, unless it can
186 -- clearly prove that the values are valid. If this switch is set (by
187 -- pragma Assume_No_Invalid_Values (On)), then the compiler assumes values
188 -- are valid and in range of their representations. This feature is now
189 -- fully enabled in the compiler.
191 Back_Annotate_Rep_Info : Boolean := False;
193 -- If set True, enables back annotation of representation information
194 -- by gigi, even in -gnatc mode. This is set True by the use of -gnatR
195 -- (list representation information). It is also set true if certain
196 -- Unchecked_Conversion instantiations require checking based on annotated
199 Back_End_Handles_Limited_Types : Boolean;
200 -- This flag is set true if the back end can properly handle limited or
201 -- other by reference types, and avoid copies. If this flag is False, then
202 -- the front end does special expansion for if/case expressions to make
203 -- sure that no copy occurs. If the flag is True, then the expansion for
204 -- if and case expressions relies on the back end properly handling things.
205 -- Currently the default is False for all cases (set in gnat1drv). The
206 -- default can be modified using -gnatd.L (sets the flag True). This is
207 -- used to test the possibility of having the backend handle this.
209 Back_End_Inlining : Boolean := False;
211 -- Set True to activate inlining by back-end expansion. This is the normal
212 -- default mode for gcc targets, so it is True on such targets unless the
213 -- switches -gnatN or -gnatd.z are used. See circuitry in gnat1drv for the
214 -- exact conditions for setting this switch.
216 -- WARNING: There is a matching C declaration of this variable in fe.h
218 Bind_Alternate_Main_Name : Boolean := False;
220 -- True if main should be called Alternate_Main_Name.all.
221 -- This variable may be set to True by Gnatbind.Scan_Bind_Arg.
223 Bind_Main_Program : Boolean := True;
225 -- Set to False if not binding main Ada program
227 Bind_For_Library : Boolean := False;
229 -- Set to True if the binder needs to generate a file designed for building
230 -- a library. May be set to True by Gnatbind.Scan_Bind_Arg.
232 Bind_Only : Boolean := False;
233 -- GNATMAKE, GPRBUILD
234 -- Set to True to skip compile and link steps
235 -- (except when Compile_Only and/or Link_Only are True).
237 Blank_Deleted_Lines : Boolean := False;
239 -- Output empty lines for each line of preprocessed input that is deleted
240 -- in the output, including preprocessor lines starting with a '#'.
242 Brief_Output : Boolean := False;
244 -- Force brief error messages to standard error, even if verbose mode is
245 -- set (so that main error messages go to standard output).
247 Build_Bind_And_Link_Full_Project : Boolean := False;
249 -- Set to True to build, bind and link all the sources of a project file
252 Check_Aliasing_Of_Parameters : Boolean := False;
254 -- Set to True to detect whether subprogram parameters and function results
255 -- alias the same object(s).
257 Check_Float_Overflow : Boolean := False;
259 -- Set to True to check that operations on predefined unconstrained float
260 -- types (e.g. Float, Long_Float) do not overflow and generate infinities
261 -- or invalid values. Set by the Check_Float_Overflow pragma, or by use
262 -- of the -gnateF switch.
264 Check_Object_Consistency : Boolean := False;
265 -- GNATBIND, GNATMAKE
266 -- Set to True to check whether every object file is consistent with its
267 -- corresponding ada library information (ALI) file. An object file is
268 -- inconsistent with the corresponding ALI file if the object file does
269 -- not exist or if it has an older time stamp than the ALI file. Default
270 -- above is for GNATBIND. GNATMAKE overrides this default to True (see
271 -- Make.Initialize) since we normally do need to check source consistencies
274 Check_Only : Boolean := False;
276 -- Set to True to do checks only, no output of binder file
278 Check_Policy_List : Node_Id := Empty;
280 -- This points to the list of N_Pragma nodes for Check_Policy pragmas
281 -- that are linked through the Next_Pragma fields, with the list being
282 -- terminated by Empty. The order is most recently processed first. Note
283 -- that Push_Scope and Pop_Scope in Sem_Ch8 save and restore the value
284 -- of this variable, implementing the required scope control for pragmas
285 -- appearing in a declarative part.
287 Check_Readonly_Files : Boolean := False;
289 -- Set to True to check readonly files during the make process
291 Check_Source_Files : Boolean := True;
292 -- GNATBIND, GNATMAKE
293 -- Set to True to enable consistency checking for any source files that
294 -- are present (i.e. date must match the date in the library info file).
295 -- Set to False for object file consistency check only. This flag is
296 -- directly modified by gnatmake, to affect the shared binder routines.
298 Check_Switches : Boolean := False;
300 -- Set to True to check compiler options during the make process
302 Check_Unreferenced : Boolean := False;
304 -- Set to True to enable checking for unreferenced entities other
305 -- than formal parameters (for which see Check_Unreferenced_Formals)
306 -- Modified by use of -gnatwu/U.
308 Check_Unreferenced_Formals : Boolean := False;
310 -- Set to True to check for unreferenced formals. This is turned on by
311 -- -gnatwa/wf/wu and turned off by -gnatwA/wF/wU.
313 Check_Validity_Of_Parameters : Boolean := False;
315 -- Set to True to check for proper scalar initialization of subprogram
316 -- parameters on both entry and exit. This is turned on by -gnateV.
318 Check_Withs : Boolean := False;
320 -- Set to True to enable checking for unused withs, and also the case
321 -- of withing a package and using none of the entities in the package.
322 -- Modified by use of -gnatwu/U.
324 CodePeer_Mode : Boolean := False;
325 -- GNAT, GNATBIND, GPRBUILD
326 -- Enable full CodePeer mode (SCIL generation, disable switches that
327 -- interact badly with it, etc...). This is turned on by -gnatC.
329 Commands_To_Stdout : Boolean := False;
331 -- True if echoed commands to be written to stdout instead of stderr
333 Comment_Deleted_Lines : Boolean := False;
335 -- True if source lines removed by the preprocessor should be commented
336 -- in the output file.
338 Compilation_Time : String (1 .. 19);
340 -- Compilation date and time in form YYYY-MM-DD HH:MM:SS
342 Compile_Only : Boolean := False;
343 -- GNATMAKE, GNATCLEAN, GPBUILD, GPRCLEAN
344 -- GNATMAKE, GPRBUILD:
345 -- set True to skip bind and link steps (except when Bind_Only is True)
346 -- GNATCLEAN, GPRCLEAN:
347 -- set True to delete only the files produced by the compiler but not the
348 -- library files or the executable files.
350 Compiler_Unit : Boolean := False;
352 -- Set True by an occurrence of pragma Compiler_Unit_Warning (or of the
353 -- obsolete pragma Compiler_Unit) in the main unit. Once set True, stays
354 -- True, since any units that are with'ed directly or indirectly by
355 -- a Compiler_Unit_Warning main unit are subject to the same restrictions.
356 -- Such units really should have their own pragmas, but we do not bother to
357 -- check for that, so this transitivity provides extra checking.
359 Config_File : Boolean := True;
361 -- Set to False to inhibit reading and processing of gnat.adc file
363 Config_File_Names : String_List_Access := null;
365 -- Names of configuration pragmas files (given by switches -gnatec)
367 Config_Files_Store_Basename : Boolean := False;
369 -- Set True for -gnateb. Tells GNAT that config files should be referred to
370 -- by their basename and their checksums computed in ALI files.
372 Configurable_Run_Time_Mode : Boolean := False;
374 -- Set True if the compiler is operating in configurable run-time mode.
375 -- This happens if the flag Targparm.Configurable_Run_Time_On_Target is
376 -- True, or if pragma No_Run_Time is used. See the spec of Rtsfind for
377 -- details on the handling of the latter pragma.
379 Constant_Condition_Warnings : Boolean := False;
381 -- Set to True to activate warnings on constant conditions. Modified by
384 Create_Mapping_File : Boolean := False;
386 -- Set to True (-C switch) to indicate that the compiler will be invoked
387 -- with a mapping file (-gnatem compiler switch).
389 subtype Debug_Level_Value is Nat range 0 .. 3;
390 Debugger_Level : Debug_Level_Value := 0;
392 -- The value given to the -g parameter. The default value for -g with
393 -- no value is 2. If no -g is specified, defaults to 0.
394 -- Note that the generated code should never depend on this variable,
395 -- since we want debug info to be nonintrusive on the generate code.
397 Default_Exit_Status : Int := 0;
399 -- Set the default exit status value. Set by the -Xnnn switch for the
402 Debug_Generated_Code : Boolean := False;
404 -- Set True (-gnatD switch) to debug generated expanded code instead
405 -- of the original source code. Causes debugging information to be
406 -- written with respect to the generated code file that is written.
408 -- WARNING: There is a matching C declaration of this variable in fe.h
410 Default_Pool : Node_Id := Empty;
412 -- Used to record the storage pool name (or null literal) that is the
413 -- argument of an applicable pragma Default_Storage_Pool.
414 -- Empty: No pragma Default_Storage_Pool applies.
415 -- N_Null node: "pragma Default_Storage_Pool (null);" applies.
416 -- otherwise: "pragma Default_Storage_Pool (X);" applies, and
417 -- this points to the name X.
418 -- Push_Scope and Pop_Scope in Sem_Ch8 save and restore this value.
420 No_Stack_Size : constant := -1;
422 Default_Stack_Size : Int := No_Stack_Size;
424 -- Set to default primary stack size in units of bytes. Set by the -dnnn
425 -- switch for the binder. A value of No_Stack_Size indicates that
426 -- no default was set by the binder.
428 Default_Sec_Stack_Size : Int := No_Stack_Size;
430 -- Set to default secondary stack size in units of bytes. Set by the -Dnnn
431 -- switch for the binder. A value of No_Stack_Size indicates that no
432 -- default was set by the binder and the run-time value should be used
435 Default_SSO : Character := ' ';
437 -- Set if a pragma Default_Scalar_Storage_Order has been given. The value
438 -- of ' ' indicates that no default has been set, otherwise the value is
439 -- either 'H' for High_Order_First or 'L' for Lower_Order_First.
441 Detect_Blocking : Boolean := False;
443 -- Set True to force the run time to raise Program_Error if calls to
444 -- potentially blocking operations are detected from protected actions.
446 Directories_Must_Exist_In_Projects : Boolean := True;
448 -- Set to False with switch -f of gnatclean and gprclean
450 Disable_FE_Inline : Boolean := False;
452 -- Request to disable front end inlining from pragma Inline in the
453 -- presence of the -fno-inline back end flag on the command line,
454 -- regardless of any other switches that are set.
455 -- It remains the back end's reponsibility to honor -fno-inline at the
458 Display_Compilation_Progress : Boolean := False;
459 -- GNATMAKE, GPRBUILD
460 -- Set True (-d switch) to display information on progress while compiling
461 -- files. Internal flag to be used in conjunction with an IDE
462 -- (e.g GNAT Studio).
464 type Distribution_Stub_Mode_Type is
467 -- Normal mode, no generation of distribution stubs
469 Generate_Receiver_Stub_Body,
470 -- The unit being compiled is the RCI body, and the compiler will
471 -- generate the body for the receiver stubs and compile it.
473 Generate_Caller_Stub_Body);
474 -- The unit being compiled is the RCI spec, and the compiler will
475 -- generate the body for the caller stubs and compile it.
477 Distribution_Stub_Mode : Distribution_Stub_Mode_Type := No_Stubs;
479 -- This enumeration variable indicates the three states of distribution
480 -- annex stub generation.
482 Do_Not_Execute : Boolean := False;
484 -- Set to True if no actual compilations should be undertaken
486 Dump_Source_Text : Boolean := False;
488 -- Set to True (by -gnatL) to dump source text intermingled with generated
489 -- code. Effective only if either of Debug/Print_Generated_Code is true.
491 Dynamic_Elaboration_Checks : Boolean := False;
493 -- Set True for dynamic elaboration checking mode, as set by the -gnatE
494 -- switch or by the use of pragma Elaboration_Checks (Dynamic).
496 Dynamic_Stack_Measurement : Boolean := False;
498 -- Set True to enable dynamic stack measurement (-u flag for gnatbind)
500 Dynamic_Stack_Measurement_Array_Size : Nat := 100;
502 -- Number of measurements we want to store during dynamic stack analysis.
503 -- When the buffer is full, non-storable results will be output on the fly.
504 -- The value is relevant only if Dynamic_Stack_Measurement is set. Set
505 -- by processing of -u flag for gnatbind.
507 Elab_Dependency_Output : Boolean := False;
509 -- Set to True to output complete list of elaboration constraints
511 Elab_Order_Output : Boolean := False;
513 -- Set to True to output chosen elaboration order
515 Elab_Info_Messages : Boolean := False;
517 -- Set to True to output info messages for static elabmodel (-gnatel)
519 Elab_Warnings : Boolean := True;
521 -- Set to True to generate elaboration warnings (-gnatwl). The warnings are
522 -- enabled by default because they carry the same importance as errors. The
523 -- compiler cannot emit actual errors because elaboration diagnostics need
524 -- dataflow analysis, which is not available. This behavior parallels that
525 -- of the old ABE mechanism.
527 Enable_128bit_Types : Boolean := False;
529 -- Set to True to enable the support for 128-bit types in the compiler.
530 -- The prerequisite is a 64-bit target that supports 128-bit computation.
532 -- WARNING: There is a matching C declaration of this variable in fe.h
534 Error_Msg_Line_Length : Nat := 0;
536 -- Records the error message line length limit. If this is set to zero,
537 -- then we get the old style behavior, in which each call to the error
538 -- message routines generates one line of output as a separate message.
539 -- If it is set to a non-zero value, then continuation lines are folded
540 -- to make a single long message, and then this message is split up into
541 -- multiple lines not exceeding the specified length. Set by -gnatj=nn.
543 Error_To_Warning : Boolean := False;
545 -- If True, then certain error messages (e.g. parameter overlap messages
546 -- for procedure calls in Ada 2012 mode) are treated as warnings instead
547 -- of errors. Set by debug flag -gnatd.E. A search for Error_To_Warning
548 -- will identify affected messages.
550 Exception_Handler_Encountered : Boolean := False;
552 -- This flag is set true if the parser encounters an exception handler.
553 -- It is used to set Warn_On_Exception_Propagation True if the restriction
554 -- No_Exception_Propagation is set.
556 Exception_Extra_Info : Boolean := False;
558 -- True when switch -gnateE is used. When True, generate extra information
559 -- associated with exception messages (in particular range and index
562 -- WARNING: There is a matching C declaration of this variable in fe.h
564 Exception_Locations_Suppressed : Boolean := False;
566 -- Set to True if a Suppress_Exception_Locations configuration pragma is
569 -- WARNING: There is a matching C declaration of this variable in fe.h
571 type Exception_Mechanism_Type is
572 -- Determines the kind of mechanism used to handle exceptions
575 -- Exceptions use setjmp/longjmp generated explicitly by the front end
576 -- (this includes gigi or other equivalent parts of the code generator).
577 -- AT END handlers are converted into exception handlers by the front
581 -- Exceptions are handled by the back end. The front end simply
582 -- generates the handlers as they appear in the source, and AT END
583 -- handlers are left untouched (they are not converted into exception
584 -- handlers when operating in this mode). Propagation is performed
585 -- using a frame unwinding scheme and requires no particular setup code
586 -- at handler sites on regular execution paths.
589 -- Similar to Back_End_ZCX with respect to the front-end processing
590 -- of regular and AT-END handlers. A setjmp/longjmp scheme is used to
591 -- propagate and setup handler contexts on regular execution paths.
592 pragma Convention (C, Exception_Mechanism_Type);
594 -- WARNING: There is a matching C declaration of this type in fe.h
596 Exception_Mechanism : Exception_Mechanism_Type := Front_End_SJLJ;
598 -- Set to the appropriate value depending on the flags in system.ads
599 -- (Frontend_Exceptions + ZCX_By_Default). The C convention is there to
600 -- allow access by gigi.
602 -- WARNING: There is a matching C declaration of this variable in fe.h
604 function Back_End_Exceptions return Boolean;
605 function Front_End_Exceptions return Boolean;
606 function ZCX_Exceptions return Boolean;
607 function SJLJ_Exceptions return Boolean;
609 -- Various properties of the active Exception_Mechanism
611 -- WARNING: There is a matching C declaration of these subprograms in fe.h
613 Exception_Tracebacks : Boolean := False;
615 -- Set to True to store tracebacks in exception occurrences (-Ea or -E)
617 Exception_Tracebacks_Symbolic : Boolean := False;
619 -- Set to True to store tracebacks in exception occurrences and enable
620 -- symbolic tracebacks (-Es).
622 Expand_Nonbinary_Modular_Ops : Boolean := False;
623 -- Set to True to convert nonbinary modular additions into code
624 -- that relies on the front-end expansion of operator Mod.
626 Extensions_Allowed : Boolean := False;
628 -- Set to True by switch -gnatX if GNAT specific language extensions
629 -- are allowed. See GNAT RM for details.
631 type External_Casing_Type is (
632 As_Is, -- External names cased as they appear in the Ada source
633 Uppercase, -- External names forced to all uppercase letters
634 Lowercase); -- External names forced to all lowercase letters
636 External_Name_Imp_Casing : External_Casing_Type := Lowercase;
638 -- The setting of this flag determines the casing of external names
639 -- when the name is implicitly derived from an entity name (i.e. either
640 -- no explicit External_Name or Link_Name argument is used, or, in the
641 -- case of extended DEC pragmas, the external name is given using an
642 -- identifier. The As_Is setting is not permitted here (since this would
643 -- create Ada source programs that were case sensitive).
645 External_Name_Exp_Casing : External_Casing_Type := As_Is;
647 -- The setting of this flag determines the casing of an external name
648 -- specified explicitly with a string literal. As_Is means the string
649 -- literal is used as given with no modification to the casing. If
650 -- Lowercase or Uppercase is set, then the string is forced to all
651 -- lowercase or all uppercase letters as appropriate. Note that this
652 -- setting has no effect if the external name is given using an identifier
653 -- in the case of extended DEC import/export pragmas (in this case the
654 -- casing is controlled by External_Name_Imp_Casing), and also has no
655 -- effect if an explicit Link_Name is supplied (a link name is always
656 -- used exactly as given).
658 External_Unit_Compilation_Allowed : Boolean := False;
660 -- When True (set by gnatmake switch -x), allow compilation of sources
661 -- that are not part of any project file.
663 Fast_Math : Boolean := False;
665 -- Indicates the current setting of Fast_Math mode, as set by the use
666 -- of a Fast_Math pragma (set True by Fast_Math (On)).
668 Force_ALI_File : Boolean := False;
670 -- Force generation of ALI file even if errors are encountered.
671 -- Set on by use of -gnatQ.
673 Disable_ALI_File : Boolean := False;
675 -- Disable generation of ALI file
677 Follow_Links_For_Files : Boolean := False;
679 -- Set to True (-eL) to process the project files in trusted mode. If
680 -- Follow_Links is False, it is assumed that the project doesn't contain
681 -- any file duplicated through symbolic links (although the latter are
682 -- still valid if they point to a file which is outside of the project),
683 -- and that no directory has a name which is a valid source name.
685 Follow_Links_For_Dirs : Boolean := False;
687 -- Set to True if directories can be links in this project, and therefore
688 -- additional system calls must be performed to ensure that we always see
689 -- the same full name for each directory.
691 Force_Checking_Of_Elaboration_Flags : Boolean := False;
693 -- True if binding with forced checking of the elaboration flags
696 Force_Compilations : Boolean := False;
697 -- GNATMAKE, GPRBUILD
698 -- Set to force recompilations even when the objects are up-to-date.
700 Force_Elab_Order_File : String_Ptr := null;
702 -- File name specified for -f switch (the forced elaboration order file)
704 Front_End_Inlining : Boolean := False;
706 -- Set True to activate inlining by front-end expansion (even on GCC
707 -- targets, where inlining is normally handled by the back end). Set by
708 -- the flag -gnatN (which is now considered obsolescent, since the GCC
709 -- back end can do a better job of inlining than the front end these days).
711 Full_Path_Name_For_Brief_Errors : Boolean := False;
713 -- When True, in Brief_Output mode, each error message line will start with
714 -- the full path name of the source. When False, only the file name without
715 -- directory information is used.
717 Full_List : Boolean := False;
719 -- Set True to generate full source listing with embedded errors
721 Full_List_File_Name : String_Ptr := null;
723 -- Set to file name to generate full source listing to named file (or if
724 -- the name is of the form .xxx, then to name.xxx where name is the source
725 -- file name with extension stripped.
727 Generate_Asm : Boolean := False;
729 -- True if generating assembly instead of an object file, via the -S switch
731 Generate_C_Code : Boolean := False;
733 -- If True, the Cprint circuitry to generate C code output is activated.
734 -- Set True by use of -gnateg or -gnatd.V for GNAT, and -G for GNATBIND.
736 Generate_CodePeer_Messages : Boolean := False;
738 -- Generate CodePeer messages. Ignored if CodePeer_Mode is false. This is
739 -- turned on by -gnateC.
741 Generate_Processed_File : Boolean := False;
743 -- True when switch -gnateG is used. When True, create in a file
744 -- <source>.prep, if the source is preprocessed.
746 Generate_SCIL : Boolean := False;
748 -- Set True to activate SCIL code generation.
750 Generate_SCO : Boolean := False;
752 -- True when switch -fdump-scos (or -gnateS) is used. When True, Source
753 -- Coverage Obligation (SCO) information is generated and output in the ALI
754 -- file. See unit Par_SCO for full details.
756 Generate_SCO_Instance_Table : Boolean := False;
758 -- True when switch -fdump-scos is used. When True, a table of instances is
761 -- WARNING: There is a matching C declaration of this variable in fe.h
763 Generating_Code : Boolean := False;
765 -- True if the frontend finished its work and has called the backend to
766 -- process the tree and generate the object file.
768 type Ghost_Mode_Type is (None, Check, Ignore);
769 -- Possible legal modes that can be set by aspect/pragma Ghost as well as
770 -- value None, which indicates that no such aspect/pragma applies.
772 Ghost_Mode : Ghost_Mode_Type := None;
774 -- The current Ghost mode in effect
776 Global_Discard_Names : Boolean := False;
778 -- True if a pragma Discard_Names appeared as a configuration pragma for
779 -- the current compilation unit.
781 GNAT_Encodings : Int;
782 pragma Import (C, GNAT_Encodings, "gnat_encodings");
783 -- Constant controlling the balance between GNAT encodings and standard
784 -- DWARF to emit in the debug information. It accepts the following values.
786 DWARF_GNAT_Encodings_All : constant Int := 0;
787 DWARF_GNAT_Encodings_GDB : constant Int := 1;
788 DWARF_GNAT_Encodings_Minimal : constant Int := 2;
790 Identifier_Character_Set : Character;
792 -- This variable indicates the character set to be used for identifiers.
793 -- The possible settings are:
794 -- '1' Latin-1 (ISO-8859-1)
795 -- '2' Latin-2 (ISO-8859-2)
796 -- '3' Latin-3 (ISO-8859-3)
797 -- '4' Latin-4 (ISO-8859-4)
798 -- '5' Latin-Cyrillic (ISO-8859-5)
799 -- '9' Latin-9 (ISO-8859-15)
800 -- 'p' PC (US, IBM page 437)
801 -- '8' PC (European, IBM page 850)
802 -- 'f' Full upper set (all distinct)
803 -- 'n' No upper characters (Ada 83 rules)
804 -- 'w' Latin-1 plus wide characters allowed in identifiers
806 -- The setting affects the set of letters allowed in identifiers and the
807 -- upper/lower case equivalences. It does not affect the interpretation of
808 -- character and string literals, which are always stored using the actual
809 -- coding in the source program. This variable is initialized to the
810 -- default value appropriate to the system (in Osint.Initialize), and then
811 -- reset if a command line switch is used to change the setting.
813 Ignore_Rep_Clauses : Boolean := False;
815 -- Set True to ignore all representation clauses. Useful when compiling
816 -- code from foreign compilers for checking purposes. Can be
817 -- set True by use of -gnatI.
819 Ignore_SPARK_Mode_Pragmas_In_Instance : Boolean := False;
821 -- Set True to ignore the semantics and effects of pragma SPARK_Mode when
822 -- the pragma appears inside an instance whose enclosing context is subject
823 -- to SPARK_Mode "off". This property applies to nested instances.
825 Ignore_Style_Checks_Pragmas : Boolean := False;
827 -- Set True to ignore all Style_Checks pragmas. Can be set True by use
830 Ignore_Unrecognized_VWY_Switches : Boolean := False;
832 -- Set True to ignore unrecognized y, V, w switches. Can be set True by
833 -- use of -gnateu, causing subsequent unrecognized switches to result in
834 -- a warning rather than an error.
836 Ignored_Ghost_Region : Node_Id := Empty;
838 -- The start of the current ignored Ghost region. This value must always
839 -- reflect the starting node of the outermost ignored Ghost region. If a
840 -- nested ignored Ghost region is entered, the value must remain unchanged.
842 Implementation_Unit_Warnings : Boolean := True;
844 -- Set True to active warnings for use of implementation internal units.
845 -- Modified by use of -gnatwi/-gnatwI.
847 Implicit_Packing : Boolean := False;
849 -- If set True, then a Size attribute clause on an array is allowed to
850 -- cause implicit packing instead of generating an error message. Set by
851 -- use of pragma Implicit_Packing.
853 Include_Subprogram_In_Messages : Boolean := False;
855 -- Set True to include the enclosing subprogram in compiler messages.
857 Ineffective_Inline_Warnings : Boolean := False;
859 -- Set True to activate warnings if front-end inlining (-gnatN) is not able
860 -- to actually inline a particular call (or all calls). Can be controlled
861 -- by use of -gnatwp/-gnatwP. Also set True to activate warnings if
862 -- frontend inlining is not able to inline a subprogram expected to
863 -- be inlined in GNATprove mode.
865 Init_Or_Norm_Scalars : Boolean := False;
867 -- Set True if a pragma Initialize_Scalars applies to the current unit.
868 -- Also set True if a pragma Restriction (Normalize_Scalars) applies.
870 Initialize_Scalars : Boolean := False;
872 -- Set True if a pragma Initialize_Scalars applies to the current unit.
873 -- Note that Init_Or_Norm_Scalars is also set to True if this is True.
875 Initialize_Scalars_Mode1 : Character := 'I';
876 Initialize_Scalars_Mode2 : Character := 'N';
878 -- Set to two characters from -S switch (IN/LO/HI/EV/xx). The default
879 -- is IN (invalid values), used if no -S switch is used.
881 Inline_Active : Boolean := False;
883 -- Set True to activate pragma Inline processing across modules. Default
884 -- for now is not to inline across module boundaries.
886 Inline_Level : Nat := 0;
888 -- Set to indicate the inlining level: 0 means that an appropriate value is
889 -- to be computed by the compiler based on the optimization level (-gnatn),
890 -- 1 is for moderate inlining across modules (-gnatn1) and 2 for full
891 -- inlining across modules (-gnatn2).
893 Interface_Library_Unit : Boolean := False;
895 -- Set to True to indicate that at least one ALI file is an interface ALI:
896 -- then elaboration flag checks are to be generated in the binder
899 Invalid_Value_Used : Boolean := False;
901 -- Set True if a valid Invalid_Value attribute is encountered
903 Inline_Processing_Required : Boolean := False;
905 -- Set True if inline processing is required. Inline processing is required
906 -- if an active Inline pragma is processed. The flag is set for a pragma
907 -- Inline or Inline_Always that is actually active.
909 In_Place_Mode : Boolean := False;
911 -- Set True to store ALI and object files in place i.e. in the object
912 -- directory if these files already exist or in the source directory
915 Keep_Going : Boolean := False;
916 -- GNATMAKE, GPRBUILD
917 -- When True signals to ignore compilation errors and keep processing
918 -- sources until there is no more work.
920 Keep_Temporary_Files : Boolean := False;
921 -- GNATCMD, GNATMAKE, GPRBUILD
922 -- When True the temporary files are not deleted. Set by switches -dn or
923 -- --keep-temp-files.
925 Leap_Seconds_Support : Boolean := False;
927 -- Set to True to enable leap seconds support in Ada.Calendar and its
928 -- children. Set by -y.
930 Legacy_Elaboration_Checks : Boolean := False;
932 -- Set to True when the pre-18.x access-before-elaboration model is to be
933 -- used. Modified by use of -gnatH.
935 Legacy_Elaboration_Order : Boolean := False;
937 -- Set to True when the pre-20.x elaboration-order model is to be used.
938 -- Modified by use of -H.
940 Link_Only : Boolean := False;
941 -- GNATMAKE, GPRBUILD
942 -- Set to True to skip compile and bind steps (except when Bind_Only is
945 List_Body_Required_Info : Boolean := False;
947 -- List info messages about why a package requires a body. Modified by use
950 List_Inherited_Aspects : Boolean := False;
952 -- List inherited invariants, preconditions, and postconditions from
953 -- Invariant'Class, Pre'Class, and Post'Class aspects. Also list inherited
954 -- subtype predicates. Modified by use of -gnatw.l/.L.
956 List_Restrictions : Boolean := False;
958 -- Set to True to list restrictions pragmas that could apply to partition
960 List_Units : Boolean := False;
962 -- List units in the active library for a compilation (-gnatu switch)
964 List_Closure : Boolean := False;
966 -- List all sources in the closure of a main (-R or -Ra gnatbind switch)
968 List_Closure_All : Boolean := False;
970 -- List all sources in closure of main including run-time units (-Ra
973 List_Dependencies : Boolean := False;
975 -- When True gnatmake verifies that the objects are up to date and outputs
976 -- the list of object dependencies (-M switch). Output depends if -a switch
977 -- is used or not. This list can be used directly in a Makefile.
979 List_Representation_Info : Int range 0 .. 4 := 0;
981 -- Set non-zero by -gnatR switch to list representation information.
982 -- The settings are as follows:
984 -- 0 = no listing of representation information (default as above)
985 -- 1 = list rep info for user-defined record and array types
986 -- 2 = list rep info for all user-defined types and objects
987 -- 3 = like 2, but variable fields are decoded symbolically
988 -- 4 = like 3, but list rep info for relevant compiler-generated types
990 -- WARNING: There is a matching C declaration of this variable in fe.h
992 List_Representation_Info_To_File : Boolean := False;
994 -- Set true by -gnatRs switch. Causes information from -gnatR[1-4]m to be
995 -- written to file.rep (where file is the name of the source file) instead
996 -- of stdout. For example, if file x.adb is compiled using -gnatR2s then
997 -- representation info is written to x.adb.ref.
999 List_Representation_Info_To_JSON : Boolean := False;
1001 -- Set true by -gnatRj switch. Causes information from -gnatR[1-4]m to be
1002 -- output in the JSON data interchange format.
1004 List_Representation_Info_Mechanisms : Boolean := False;
1006 -- Set true by -gnatRm switch. Causes information on mechanisms to be
1007 -- included in the representation output information.
1009 List_Representation_Info_Extended : Boolean := False;
1011 -- Set true by -gnatRe switch. Causes extended information for record types
1012 -- to be included in the representation output information.
1014 List_Preprocessing_Symbols : Boolean := False;
1016 -- Set to True if symbols for preprocessing a source are to be listed
1017 -- before preprocessing occurs. Set to True by switch -s of gnatprep or
1018 -- -s in preprocessing data file for the compiler.
1020 XDR_Stream : Boolean := False;
1022 -- Set to True to enable XDR in s-stratt.adb. Set by -xdr.
1024 type Create_Repinfo_File_Proc is access procedure (Src : String);
1025 type Write_Repinfo_Line_Proc is access procedure (Info : String);
1026 type Close_Repinfo_File_Proc is access procedure;
1027 -- Types used for procedure addresses below
1029 Create_Repinfo_File_Access : Create_Repinfo_File_Proc := null;
1030 Write_Repinfo_Line_Access : Write_Repinfo_Line_Proc := null;
1031 Close_Repinfo_File_Access : Close_Repinfo_File_Proc := null;
1033 -- These three locations are left null when operating in non-compiler (e.g.
1034 -- ASIS mode), but when operating in compiler mode, they are set to point
1035 -- to the three corresponding procedures in Osint-C. The reason for this
1036 -- slightly strange interface is to stop Repinfo from dragging in Osint in
1037 -- ASIS mode, which would include lots of unwanted units in the ASIS build.
1038 -- ??? Revisit this now that ASIS mode is gone.
1040 type Create_List_File_Proc is access procedure (S : String);
1041 type Write_List_Info_Proc is access procedure (S : String);
1042 type Close_List_File_Proc is access procedure;
1043 -- Types used for procedure addresses below
1045 Create_List_File_Access : Create_List_File_Proc := null;
1046 Write_List_Info_Access : Write_List_Info_Proc := null;
1047 Close_List_File_Access : Close_List_File_Proc := null;
1049 -- These three locations are left null when operating in non-compiler
1050 -- (e.g. from the binder), but when operating in compiler mode, they are
1051 -- set to point to the three corresponding procedures in Osint-C. The
1052 -- reason for this slightly strange interface is to prevent Repinfo
1053 -- from dragging in Osint-C in the binder, which would include unwanted
1054 -- units in the binder.
1056 Locking_Policy : Character := ' ';
1059 -- Set to ' ' for the default case (no locking policy specified). Otherwise
1060 -- set based on the pragma Locking_Policy:
1061 -- Ceiling_Locking: 'C'
1062 -- Concurrent_Readers_Locking: 'R'
1063 -- Inheritance_Locking: 'I'
1065 Locking_Policy_Sloc : Source_Ptr := No_Location;
1067 -- Remember location of previous Locking_Policy pragma. This is used for
1068 -- inconsistency error messages. A value of System_Location is used if the
1069 -- policy is set in package System.
1071 Look_In_Primary_Dir : Boolean := True;
1072 -- GNAT, GNATBIND, GNATMAKE, GNATCLEAN
1073 -- Set to False if a -I- was present on the command line. When True we are
1074 -- allowed to look in the primary directory to locate other source or
1077 Make_Steps : Boolean := False;
1079 -- Set to True when either Compile_Only, Bind_Only or Link_Only is
1082 Main_Index : Int := 0;
1084 -- This is set to non-zero by gnatmake switch -eInnn to indicate that
1085 -- the main program is the nnn unit in a multi-unit source file.
1087 Mapping_File_Name : String_Ptr := null;
1089 -- File name of mapping between unit names, file names and path names.
1090 -- (given by switch -gnatem)
1092 Maximum_Messages : Int := 9999;
1094 -- Maximum default number of errors before compilation is terminated, or in
1095 -- the case of GNAT, maximum number of warnings before further warnings are
1096 -- suppressed. Can be overridden by -gnatm (GNAT) or -m (GNATBIND) switch.
1098 Maximum_File_Name_Length : Int;
1100 -- Maximum number of characters allowed in a file name, not counting the
1101 -- extension, as set by the appropriate switch. If no switch is given,
1102 -- then this value is initialized by Osint to the appropriate value.
1104 Maximum_Instantiations : Int := 8000;
1106 -- Maximum number of instantiations permitted (to stop runaway cases
1107 -- of nested instantiations). These situations probably only occur in
1108 -- specially concocted test cases. Can be modified by -gnateinn switch.
1110 Maximum_Processes : Positive := 1;
1111 -- GNATMAKE, GPRBUILD
1112 -- Maximum number of processes that should be spawned to carry out
1115 Minimal_Binder : Boolean := False;
1117 -- Set to True to suppress the generation of objects by the binder that
1118 -- are not strictly required for a program to run. Intended for ZFP
1119 -- applications that have tight memory constraints.
1121 Minimal_Recompilation : Boolean := False;
1123 -- Set to True if minimal recompilation mode requested
1125 Minimize_Expression_With_Actions : Boolean := False;
1127 -- If True, minimize the use of N_Expression_With_Actions node.
1128 -- This can be used in particular on some back-ends where this node is
1129 -- difficult to support.
1131 Modify_Tree_For_C : Boolean := False;
1133 -- If this switch is set True (currently it is set only by -gnatd.V), then
1134 -- certain meaning-preserving transformations are applied to the tree to
1135 -- make it easier to interface with back ends that implement C semantics.
1136 -- There is a section in Sinfo which describes the transformations made.
1138 Multiple_Unit_Index : Nat := 0;
1140 -- This is set non-zero if the current unit is being compiled in multiple
1141 -- unit per file mode, meaning that the current unit is selected from the
1142 -- sequence of units in the current source file, using the value stored
1143 -- in this variable (e.g. 2 = select second unit in file). A value of
1144 -- zero indicates that we are in normal (one unit per file) mode.
1146 No_Backup : Boolean := False;
1148 -- Do not create backup copies of project files. Set by switch --no-backup.
1150 No_Component_Reordering : Boolean := False;
1152 -- Set True if pragma No_Component_Reordering with no parameter encountered
1154 No_Deletion : Boolean := False;
1156 -- Set by preprocessor switch -a. Do not eliminate any source text. Implies
1157 -- Undefined_Symbols_Are_False. Useful to perform a syntax check on all
1158 -- branches of #if constructs.
1160 No_Elab_Code_All_Pragma : Node_Id := Empty;
1161 -- Set to point to a No_Elaboration_Code_All pragma or aspect encountered
1162 -- in the spec of the extended main unit. Used to determine if we need to
1163 -- do special tests for violation of this aspect.
1165 No_Heap_Finalization_Pragma : Node_Id := Empty;
1167 -- Set to point to a No_Heap_Finalization pragma defined in a configuration
1170 No_Main_Subprogram : Boolean := False;
1171 -- GNATMAKE, GNATBIND
1172 -- Set to True if compilation/binding of a program without main
1173 -- subprogram requested.
1175 No_Run_Time_Mode : Boolean := False;
1177 -- This flag is set True if a No_Run_Time pragma is encountered. See spec
1178 -- of Rtsfind for a full description of handling of this pragma.
1180 No_Split_Units : Boolean := False;
1182 -- Set to True with switch --no-split-units. When True, unit sources, spec,
1183 -- body and subunits, must all be in the same project. This is checked
1184 -- after each compilation.
1186 No_Stdinc : Boolean := False;
1187 -- GNAT, GNATBIND, GNATMAKE, GNATFIND, GNATXREF
1188 -- Set to True if no default source search dirs added to search list.
1190 No_Stdlib : Boolean := False;
1191 -- GNATMAKE, GNATBIND, GNATFIND, GNATXREF
1192 -- Set to True if no default library search dirs added to search list.
1194 No_Strict_Aliasing : Boolean := False;
1196 -- Set True if pragma No_Strict_Aliasing with no parameters encountered.
1198 -- WARNING: There is a matching C declaration of this variable in fe.h
1200 No_Tagged_Streams : Node_Id := Empty;
1202 -- If a pragma No_Tagged_Streams is active for the current scope, this
1203 -- points to the corresponding pragma.
1205 Nodes_Size_In_Meg : Nat := 0;
1207 -- Amount of memory to allocate for all nodes, in units of 2**20 bytes.
1208 -- Set by the -gnaten switch; 0 means -gnaten was not given, and a default
1209 -- value should be used.
1211 Normalize_Scalars : Boolean := False;
1213 -- Set True if a pragma Normalize_Scalars applies to the current unit.
1214 -- Note that Init_Or_Norm_Scalars is also set to True if this is True.
1216 Object_Directory_Present : Boolean := False;
1218 -- Set to True when an object directory is specified with option -D
1220 Object_Path_File_Name : String_Ptr := null;
1222 -- Path of the temporary file that contains a list of object directories
1223 -- passed by -gnateO=<obj_path_file>.
1225 One_Compilation_Per_Obj_Dir : Boolean := False;
1226 -- GNATMAKE, GPRBUILD
1227 -- Set to True with switch --single-compile-per-obj-dir. When True, there
1228 -- cannot be simultaneous compilations with the object files in the same
1229 -- object directory, if project files are used.
1231 type Operating_Mode_Type is (Check_Syntax, Check_Semantics, Generate_Code);
1232 pragma Ordered (Operating_Mode_Type);
1233 Operating_Mode : Operating_Mode_Type := Generate_Code;
1235 -- Indicates the operating mode of the compiler. The default is generate
1236 -- code, which runs the parser, semantics and backend. Switches can be
1237 -- used to set syntax checking only mode, or syntax and semantics checking
1238 -- only mode. Operating_Mode can also be modified as a result of detecting
1239 -- errors during the compilation process. In particular if any serious
1240 -- error is detected then this flag is reset from Generate_Code to
1241 -- Check_Semantics after generating an error message. This is an ordered
1242 -- type with the semantics that each value does more than the previous one.
1244 Optimize_Alignment : Character := 'O';
1246 -- Setting of Optimize_Alignment, set to T/S/O for time/space/off. Can
1247 -- be modified by use of pragma Optimize_Alignment.
1249 Optimize_Alignment_Local : Boolean := False;
1251 -- Set True if Optimize_Alignment mode is set by a local configuration
1252 -- pragma that overrides the gnat.adc (or other configuration file) default
1253 -- so that the unit is not dependent on the default setting. Also always
1254 -- set True for internal units, since these always have a default setting
1255 -- of Optimize_Alignment (Off) that is enforced (essentially equivalent to
1256 -- them all having such an explicit pragma in each unit).
1258 Original_Operating_Mode : Operating_Mode_Type := Generate_Code;
1260 -- Indicates the original operating mode of the compiler as set by compiler
1261 -- options. This is identical to Operating_Mode except that this is not
1262 -- affected by errors.
1264 Optimization_Level : Int;
1265 pragma Import (C, Optimization_Level, "optimize");
1267 -- Constant reflecting the optimization level (0,1,2,3 for -O0,-O1,-O2,-O3)
1269 Optimize_Size : Int;
1270 pragma Import (C, Optimize_Size, "optimize_size");
1272 -- Constant reflecting setting of -Os (optimize for size). Set to nonzero
1273 -- in -Os mode and set to zero otherwise.
1275 Output_File_Name_Present : Boolean := False;
1276 -- GNATBIND, GNAT, GNATMAKE
1277 -- Set to True when the output C file name is given with option -o for
1278 -- GNATBIND, when the object file name is given with option -gnatO for GNAT
1279 -- or when the executable is given with option -o for GNATMAKE.
1281 Output_Linker_Option_List : Boolean := False;
1283 -- True if output of list of linker options is requested (-K switch set)
1285 Output_ALI_List : Boolean := False;
1286 ALI_List_Filename : String_Ptr;
1288 -- True if output of list of ALIs is requested (-A switch set). List is
1289 -- output under the given filename, or standard output if not specified.
1291 Output_Object_List : Boolean := False;
1292 Object_List_Filename : String_Ptr;
1294 -- True if output of list of objects is requested (-O switch set). List is
1295 -- output under the given filename, or standard output if not specified.
1297 Partition_Elaboration_Policy : Character := ' ';
1299 -- Set to ' ' for the default case (no elaboration policy specified). Reset
1300 -- to first character (uppercase) of locking policy name if a valid pragma
1301 -- Partition_Elaboration_Policy is encountered.
1303 Partition_Elaboration_Policy_Sloc : Source_Ptr := No_Location;
1305 -- Remember location of previous Partition_Elaboration_Policy pragma. This
1306 -- is used for inconsistency error messages. A value of System_Location is
1307 -- used if the policy is set in package System.
1309 Persistent_BSS_Mode : Boolean := False;
1311 -- True if a Persistent_BSS configuration pragma is in effect, causing
1312 -- potentially persistent data to be placed in the persistent_bss section.
1314 Pessimistic_Elab_Order : Boolean := False;
1316 -- True if pessimistic elaboration order is to be chosen (-p switch set)
1318 Prefix_Exception_Messages : Boolean := False;
1320 -- Set True to prefix exception messages with entity-name:
1322 Preprocessing_Data_File : String_Ptr := null;
1324 -- Set by switch -gnatep=. The file name of the preprocessing data file.
1326 Preprocessing_Symbol_Defs : String_List_Access := new String_List (1 .. 4);
1327 -- An extensible array to temporarily stores symbol definitions specified
1328 -- on the command line with -gnateD switches. The value 4 is an arbitrary
1329 -- starting point, if more space is needed it is allocated as required.
1331 Preprocessing_Symbol_Last : Natural := 0;
1332 -- Index of last symbol definition in array Symbol_Definitions
1334 Print_Generated_Code : Boolean := False;
1336 -- Set to True to enable output of generated code in source form. This
1337 -- flag is set by the -gnatG switch.
1339 Print_Standard : Boolean := False;
1341 -- Set to true to enable printing of package standard in source form.
1342 -- This flag is set by the -gnatS switch
1344 type Usage is (Unknown, Not_In_Use, In_Use);
1345 Project_File_In_Use : Usage := Unknown;
1347 -- Indicates if a project file is used or not. Set to In_Use by the first
1350 Quantity_Of_Default_Size_Sec_Stacks : Int := -1;
1352 -- The number of default sized secondary stacks that the binder should
1353 -- generate. Allows ZFP users to have the binder generate extra stacks if
1354 -- needed to support multithreaded applications. A value of -1 indicates
1355 -- that no size was set by the binder.
1357 Queuing_Policy : Character := ' ';
1359 -- Set to ' ' for the default case (no queuing policy specified). Reset to
1360 -- first character (uppercase) of locking policy name if a valid
1361 -- Queuing_Policy pragma is encountered.
1363 Queuing_Policy_Sloc : Source_Ptr := No_Location;
1365 -- Remember location of previous Queuing_Policy pragma. This is used for
1366 -- inconsistency error messages. A value of System_Location is used if the
1367 -- policy is set in package System.
1369 Quiet_Output : Boolean := False;
1370 -- GNATMAKE, GNATCLEAN, GPRBUILD, GPRCLEAN
1371 -- Set to True if the tool should not have any output if there are no
1372 -- errors or warnings.
1374 Overriding_Renamings : Boolean := False;
1376 -- Set to True to enable compatibility mode with Rational compiler, and
1377 -- to accept renamings of implicit operations in their own scope.
1379 Relaxed_Elaboration_Checks : Boolean := False;
1381 -- Set to True to ignore certain elaboration scenarios, thus making the
1382 -- current ABE mechanism more permissive. This behavior is applicable to
1383 -- both the default and the legacy ABE models. Modified by use of -gnatJ.
1385 Relaxed_RM_Semantics : Boolean := False;
1387 -- Set to True to ignore some Ada semantic error to help parse legacy Ada
1388 -- code for use in e.g. static analysis (such as CodePeer). This deals
1389 -- with cases where other compilers allow illegal constructs. Tools such as
1390 -- CodePeer are interested in analyzing code rather than enforcing legality
1391 -- rules, so as long as these illegal constructs end up with code that can
1392 -- be handled by the tool in question, there is no reason to reject the
1393 -- code that is considered correct by the other compiler.
1395 Replace_In_Comments : Boolean := False;
1397 -- Set to True if -C switch used.
1399 RTS_Lib_Path_Name : String_Ptr := null;
1400 RTS_Src_Path_Name : String_Ptr := null;
1402 -- Set to the "adalib" and "adainclude" directories of the run time
1403 -- specified by --RTS=.
1405 RTS_Switch : Boolean := False;
1406 -- GNAT, GNATMAKE, GNATBIND, GNATLS, GNATFIND, GNATXREF
1407 -- Set to True when the --RTS switch is set
1409 Run_Path_Option : Boolean := True;
1410 -- GNATMAKE, GNATLINK
1411 -- Set to False when no run_path_option should be issued to the linker
1413 Search_Directory_Present : Boolean := False;
1415 -- Set to True when argument is -I. Reset to False when next argument, a
1416 -- search directory path is taken into account. Note that this is quite
1417 -- different from other switches in this section in that it is only set in
1418 -- a transitory manner as a result of scanning a -I switch with no file
1419 -- name, and if set, is an indication that the next argument is to be
1420 -- treated as a file name.
1422 Sec_Stack_Used : Boolean := False;
1424 -- Set True if generated code uses the System.Secondary_Stack package. For
1425 -- the binder, set if any unit uses the secondary stack package.
1427 Setup_Projects : Boolean := False;
1429 -- Set to True for GNAT SETUP: the Project Manager creates nonexistent
1430 -- object, library, and exec directories.
1432 Shared_Libgnat : Boolean;
1434 -- Set to True if a shared libgnat is requested by using the -shared option
1435 -- for GNATBIND and to False when using the -static option. The value of
1436 -- this flag is set by Gnatbind.Scan_Bind_Arg.
1438 Short_Circuit_And_Or : Boolean := False;
1440 -- Set True if a pragma Short_Circuit_And_Or applies to the current unit.
1442 type SPARK_Mode_Type is (None, Off, On);
1443 -- Possible legal modes that can be set by aspect/pragma SPARK_Mode, as
1444 -- well as the value None, which indicates no such pragma/aspect applies.
1446 SPARK_Mode : SPARK_Mode_Type := None;
1448 -- Current SPARK mode setting.
1450 SPARK_Mode_Pragma : Node_Id := Empty;
1452 -- If the current SPARK_Mode (above) was set by a pragma, this records
1453 -- the pragma that set this mode.
1455 SPARK_Switches_File_Name : String_Ptr := null;
1457 -- Set to non-null file name by use of the -gnates switch to specify
1458 -- SPARK (gnat2why) specific switches in the given file name.
1460 Special_Exception_Package_Used : Boolean := False;
1462 -- Set to True if either of the unit GNAT.Most_Recent_Exception or
1463 -- GNAT.Exception_Traces is with'ed. Used to inhibit transformation of
1464 -- local raise statements into gotos in the presence of either package.
1466 Sprint_Line_Limit : Nat := 72;
1468 -- Limit values for chopping long lines in Cprint/Sprint output, can be
1469 -- reset by use of NNN parameter with -gnatG or -gnatD switches.
1471 Stack_Checking_Enabled : Boolean := False;
1473 -- Set to indicate if stack checking is enabled for the compilation. This
1474 -- is set directly from the value in the gcc back end in the body of the
1475 -- gcc version of back_end.adb.
1477 Style_Check : Boolean := False;
1479 -- Set True to perform style checks. Activates checks carried out in
1480 -- package Style (see body of this package for details of checks). This
1481 -- flag is set True by use of either the -gnatg or -gnaty switches, or
1482 -- by the Style_Check pragma.
1484 Style_Check_Main : Boolean := False;
1486 -- Set True if Style_Check was set for the main unit. This is used to
1487 -- enable style checks for units in the main extended source that get
1488 -- with'ed indirectly. It is set True by use of either the -gnatg or
1489 -- -gnaty switches, but not by use of the Style_Checks pragma.
1491 Suppress_Control_Flow_Optimizations : Boolean := False;
1493 -- Set by -fpreserve-control-flow. Suppresses control flow optimizations
1494 -- that interfere with coverage analysis based on the object code.
1496 System_Extend_Pragma_Arg : Node_Id := Empty;
1498 -- Set non-empty if and only if a correct Extend_System pragma was present
1499 -- in which case it points to the argument of the pragma, and the name can
1500 -- be located as Chars (Expression (System_Extend_Pragma_Arg)).
1502 System_Extend_Unit : Node_Id := Empty;
1504 -- This is set to Empty if GNAT_Mode is set, since pragma Extend_System
1505 -- is never appropriate in GNAT_Mode (and causes troubles, including
1506 -- bogus circularities, if we try to compile the run-time library with
1507 -- a System extension). If GNAT_Mode is not set, then System_Extend_Unit
1508 -- is a copy of the value set in System_Extend_Pragma_Arg.
1510 Subunits_Missing : Boolean := False;
1512 -- This flag is set true if missing subunits are detected with code
1513 -- generation active. This causes code generation to be skipped.
1515 Suppress_Checks : Boolean := False;
1517 -- Set to True if -gnatp (suppress all checks) switch present.
1519 -- WARNING: There is a matching C declaration of this variable in fe.h
1521 Suppress_Options : Suppress_Record;
1523 -- Indicates outer level setting of check suppression. This initializes
1524 -- the settings of the outer scope level in any unit compiled. This is
1525 -- initialized by Osint.Initialize, and further initialized by the
1526 -- Adjust_Global_Switches flag in Gnat1drv.
1528 Table_Factor : Int := 1;
1530 -- Factor by which all initial table sizes set in Alloc are multiplied.
1531 -- Used in Table to calculate initial table sizes (the initial table size
1532 -- is the value in Alloc, used as the Table_Initial parameter value,
1533 -- multiplied by the factor given here. The default value is used if no
1534 -- -gnatT switch appears.
1536 Tagged_Type_Expansion : Boolean := True;
1538 -- Set True if tagged types and interfaces should be expanded by the
1539 -- front-end. If False, the original tree is left unexpanded for tagged
1540 -- types and dispatching calls, assuming the underlying target supports it.
1542 Target_Dependent_Info_Read_Name : String_Ptr := null;
1544 -- Set non-null to override the normal processing in Get_Targ and set the
1545 -- necessary information by reading the target dependent information file
1546 -- whose name is given here (see packages Get_Targ and Set_Targ for full
1547 -- details). Set to non-null file name by use of the -gnateT switch.
1549 Target_Dependent_Info_Write_Name : String_Ptr := null;
1551 -- Set non-null to enable a call to Set_Targ.Write_Target_Dependent_Info
1552 -- which writes a target independent information file (see packages
1553 -- Get_Targ and Set_Targ for full details) using the name given by
1554 -- this switch. Set to non-null file name by use of the -gnatet switch.
1556 type Origin_Of_Target is (Unknown, Default, Specified);
1558 Target_Origin : Origin_Of_Target := Unknown;
1560 -- Indicates the origin of attribute Target in project files
1562 Target_Value : String_Access := null;
1564 -- Indicates the value of attribute Target in project files
1566 Task_Dispatching_Policy : Character := ' ';
1568 -- Set to ' ' for the default case (no task dispatching policy specified).
1569 -- Reset to first character (uppercase) of task dispatching policy name
1570 -- if a valid Task_Dispatching_Policy pragma is encountered.
1572 Task_Dispatching_Policy_Sloc : Source_Ptr := No_Location;
1574 -- Remember location of previous Task_Dispatching_Policy pragma. This is
1575 -- used for inconsistency error messages. A value of System_Location is
1576 -- used if the policy is set in package System.
1578 Tasking_Used : Boolean := False;
1579 -- Set True if any tasking construct is encountered. Used to activate the
1580 -- output of the Q, L and T lines in ALI files.
1582 Time_Slice_Set : Boolean := False;
1584 -- Set True if a pragma Time_Slice is processed in the main unit, or
1585 -- if the -gnatTnn switch is present to set a time slice value.
1587 Time_Slice_Value : Nat;
1589 -- Time slice value. Valid only if Time_Slice_Set is True, i.e. if
1590 -- Time_Slice pragma has been processed. Set to the time slice value in
1591 -- microseconds. Negative values are stored as zero, and the value is not
1592 -- larger than 1_000_000_000 (1000 seconds). Values larger than this are
1593 -- reset to this maximum. This can also be set with the -gnatTnn switch.
1595 Tolerate_Consistency_Errors : Boolean := False;
1597 -- Tolerate time stamp and other consistency errors. If this flag is set to
1598 -- True (-t), then inconsistencies result in warnings rather than errors.
1600 Transform_Function_Array : Boolean := False;
1602 -- If this switch is set True, then functions returning constrained arrays
1603 -- are transformed into a procedure with an out parameter, and all calls
1604 -- are updated accordingly.
1606 Treat_Categorization_Errors_As_Warnings : Boolean := False;
1607 -- Normally categorization errors are true illegalities. If this switch
1608 -- is set, then such errors result in warning messages rather than error
1609 -- messages. Set True by -gnateP (P for Pure/Preelaborate). Also set in
1610 -- Relaxed_RM_Semantics mode since some old Ada 83 compilers treated
1611 -- pragma Preelaborate differently.
1613 Treat_Restrictions_As_Warnings : Boolean := False;
1615 -- Set True to treat pragma Restrictions as Restriction_Warnings. Set by
1618 Try_Semantics : Boolean := False;
1620 -- Flag set to force attempt at semantic analysis, even if parser errors
1621 -- occur. This will probably cause blowups at this stage in the game. On
1622 -- the other hand, most such blowups will be caught cleanly and simply
1623 -- say compilation abandoned. This flag is set True by -gnatq or -gnatQ.
1625 Unchecked_Shared_Lib_Imports : Boolean := False;
1627 -- Set to True when shared library projects are allowed to import projects
1628 -- that are not shared library projects. Set on by use of the switch
1629 -- --unchecked-shared-lib-imports.
1631 Undefined_Symbols_Are_False : Boolean := False;
1633 -- Set to True by switch -u of gnatprep or -u in the preprocessing data
1634 -- file for the compiler. Indicates that while preprocessing sources,
1635 -- symbols that are not defined have the value FALSE.
1637 Uneval_Old : Character := 'E';
1639 -- Set to 'E'/'W'/'A' for use of Error/Warn/Allow in a valid pragma
1640 -- Unevaluated_Use_Of_Old. Default in the absence of the pragma is 'E'
1641 -- for the RM default behavior of giving an error.
1643 Unique_Error_Tag : Boolean := Tag_Errors;
1645 -- Indicates if error messages are to be prefixed by the string error:
1646 -- Initialized from Tag_Errors, can be forced on with the -gnatU switch.
1648 Unnest_Subprogram_Mode : Boolean := False;
1649 -- If true, activates the circuitry for unnesting subprograms (see the spec
1650 -- of Exp_Unst for full details). Currently set only by use of -gnatd.1.
1652 Unreserve_All_Interrupts : Boolean := False;
1654 -- Normally set False, set True if a valid Unreserve_All_Interrupts pragma
1655 -- appears anywhere in the main unit for GNAT, or if any ALI file has the
1656 -- corresponding attribute set in GNATBIND.
1658 Upper_Half_Encoding : Boolean := False;
1660 -- Normally set False, indicating that upper half ISO 8859-1 characters are
1661 -- used in the normal way to represent themselves. If the wide character
1662 -- encoding method uses the upper bit for this encoding, then this flag is
1663 -- set True, and upper half characters in the source indicate the start of
1664 -- a wide character sequence. Set by -gnatW or -W switches.
1666 Use_Include_Path_File : Boolean := False;
1667 -- GNATMAKE, GPRBUILD
1668 -- When True, create a source search path file, even when a mapping file
1671 Usage_Requested : Boolean := False;
1672 -- GNAT, GNATBIND, GNATMAKE
1673 -- Set to True if -h (-gnath for the compiler) switch encountered
1674 -- requesting usage information
1676 Use_Pragma_Linker_Constructor : Boolean := False;
1678 -- True if pragma Linker_Constructor applies to adainit
1680 Use_VADS_Size : Boolean := False;
1682 -- Set to True if a valid pragma Use_VADS_Size is processed
1684 Validity_Checks_On : Boolean := True;
1686 -- This flag determines if validity checking is on or off. The initial
1687 -- state is on, and the required default validity checks are active. The
1688 -- actual set of checks that is performed if Validity_Checks_On is set is
1689 -- defined by the switches in package Validsw. The Validity_Checks_On flag
1690 -- is controlled by pragma Validity_Checks (On | Off), and also some
1691 -- generated compiler code (typically code that has to do with validity
1692 -- check generation) is compiled with this flag set to False. This flag is
1693 -- set to False by the -gnatp switch.
1695 Verbose_Mode : Boolean := False;
1696 -- GNAT, GNATBIND, GNATMAKE, GNATLINK, GNATLS, GNATNAME, GNATCLEAN,
1697 -- GPRBUILD, GPRCLEAN
1698 -- Set to True to get verbose mode (full error message text and location
1699 -- information sent to standard output, also header, copyright and summary)
1701 type Verbosity_Level_Type is (None, Low, Medium, High);
1702 pragma Ordered (Verbosity_Level_Type);
1703 Verbosity_Level : Verbosity_Level_Type := High;
1705 -- Modified by gnatmake switches -v, -vl, -vm, -vh. Indicates
1706 -- the level of verbosity of informational messages:
1708 -- In Low Verbosity, the reasons why a source is recompiled, the name
1709 -- of the executable and the reason it must be rebuilt is output.
1711 -- In Medium Verbosity, additional lines are output for each ALI file
1714 -- In High Verbosity, additional lines are output when the ALI file
1715 -- is part of an Ada library, is read-only or is part of the runtime.
1717 Warn_On_Ada_2005_Compatibility : Boolean := True;
1719 -- Set to True to generate all warnings on Ada 2005 compatibility issues,
1720 -- including warnings on Ada 2005 obsolescent features used in Ada 2005
1721 -- mode. Set by default, modified by use of -gnatwy/Y.
1723 Warn_On_Ada_2012_Compatibility : Boolean := True;
1725 -- Set to True to generate all warnings on Ada 2012 compatibility issues,
1726 -- including warnings on Ada 2012 obsolescent features used in Ada 2012
1727 -- mode. Modified by use of -gnatwy/Y.
1729 Warn_On_Ada_202X_Compatibility : Boolean := True;
1731 -- Set to True to generate all warnings on Ada 202X compatibility issues,
1732 -- including warnings on Ada 202X obsolescent features used in Ada 202X
1733 -- mode. ???There is no warning switch for this yet.
1735 Warn_On_All_Unread_Out_Parameters : Boolean := False;
1737 -- Set to True to generate warnings in all cases where a variable is
1738 -- modified by being passed as to an OUT formal, but the resulting value is
1739 -- never read. The default is that this warning is suppressed. Modified
1740 -- by use of gnatw.o/.O.
1742 Warn_On_Assertion_Failure : Boolean := True;
1744 -- Set to True to activate warnings on assertions that can be determined
1745 -- at compile time will always fail. Modified by use of -gnatw.a/.A.
1747 Warn_On_Assumed_Low_Bound : Boolean := True;
1749 -- Set to True to activate warnings for string parameters that are indexed
1750 -- with literals or S'Length, presumably assuming a lower bound of one.
1751 -- Modified by use of -gnatww/W.
1753 Warn_On_Atomic_Synchronization : Boolean := False;
1755 -- Set to True to generate information messages for atomic synchronization.
1756 -- Modified by use of -gnatw.n/.N.
1758 Warn_On_Bad_Fixed_Value : Boolean := False;
1760 -- Set to True to generate warnings for static fixed-point expression
1761 -- values that are not an exact multiple of the small value of the type.
1762 -- Odd by default, modified by use of -gnatwb/B.
1764 Warn_On_Biased_Representation : Boolean := True;
1766 -- Set to True to generate warnings for size clauses, component clauses
1767 -- and component_size clauses that force biased representation. Modified
1768 -- by use of -gnatw.b/.B.
1770 Warn_On_Constant : Boolean := False;
1772 -- Set to True to generate warnings for variables that could be declared
1773 -- as constants. Modified by use of -gnatwk/K.
1775 Warn_On_Deleted_Code : Boolean := False;
1777 -- Set to True to generate warnings for code deleted by the front end
1778 -- for conditional statements whose outcome is known at compile time.
1779 -- Modified by use of -gnatwt/T.
1781 Warn_On_Dereference : Boolean := False;
1783 -- Set to True to generate warnings for implicit dereferences for array
1784 -- indexing and record component access. Modified by use of -gnatwd/D.
1786 Warn_On_Export_Import : Boolean := True;
1788 -- Set to True to generate warnings for suspicious use of export or
1789 -- import pragmas. Modified by use of -gnatwx/X.
1791 Warn_On_Elab_Access : Boolean := False;
1793 -- Set to True to generate warnings for P'Access in the case where
1794 -- subprogram P is in the same package as the P'Access, and the P'Access is
1795 -- evaluated at package elaboration time, and occurs before the body of P
1796 -- has been elaborated.
1798 Warn_On_Hiding : Boolean := False;
1800 -- Set to True to generate warnings if a declared entity hides another
1801 -- entity. The default is that this warning is suppressed. Modified by
1802 -- use of -gnatwh/H.
1804 Warn_On_Modified_Unread : Boolean := False;
1806 -- Set to True to generate warnings if a variable is assigned but is never
1807 -- read. Also controls warnings for similar cases involving out parameters,
1808 -- but only if there is only one out parameter for the procedure involved.
1809 -- The default is that this warning is suppressed, modified by use of
1812 Warn_On_No_Value_Assigned : Boolean := True;
1814 -- Set to True to generate warnings if no value is ever assigned to a
1815 -- variable that is at least partially uninitialized. Set to false to
1816 -- suppress such warnings. The default is that such warnings are enabled.
1817 -- Modified by use of -gnatwv/V.
1819 Warn_On_Non_Local_Exception : Boolean := False;
1821 -- Set to True to generate warnings for non-local exception raises and also
1822 -- handlers that can never handle a local raise. This warning is only ever
1823 -- generated if pragma Restrictions (No_Exception_Propagation) is set. The
1824 -- default is not to generate the warnings except that if the source has
1825 -- at least one exception handler, and this restriction is set, and the
1826 -- warning was not explicitly turned off, then it is turned on by default.
1827 -- Modified by use of -gnatw.x/.X.
1829 No_Warn_On_Non_Local_Exception : Boolean := False;
1831 -- This is set to True if the above warning is explicitly suppressed. We
1832 -- use this to avoid turning it on by default when No_Exception_Propagation
1833 -- restriction is set and an exception handler is present.
1835 Warn_On_Object_Renames_Function : Boolean := False;
1837 -- Set to True to generate warnings when a function result is renamed as
1838 -- an object. The default is that this warning is disabled. Modified by
1839 -- use of -gnatw.r/.R.
1841 Warn_On_Obsolescent_Feature : Boolean := False;
1843 -- Set to True to generate warnings on use of any feature in Annex or if a
1844 -- subprogram is called for which a pragma Obsolescent applies. Modified
1845 -- by use of -gnatwj/J.
1847 Warn_On_Overlap : Boolean := False;
1849 -- Set to True to generate warnings when a writable actual overlaps with
1850 -- another actual in a subprogram call. This applies only in modes before
1851 -- Ada 2012. Starting with Ada 2012, such overlaps are illegal.
1852 -- Modified by use of -gnatw.i/.I.
1854 Warn_On_Questionable_Missing_Parens : Boolean := True;
1856 -- Set to True to generate warnings for cases where parentheses are missing
1857 -- and the usage is questionable, because the intent is unclear. On by
1858 -- default, modified by use of -gnatwq/Q.
1860 Warn_On_Parameter_Order : Boolean := False;
1862 -- Set to True to generate warnings for cases where the argument list for
1863 -- a call is a sequence of identifiers that match the formal identifiers,
1864 -- but are in the wrong order.
1866 Warn_On_Redundant_Constructs : Boolean := False;
1868 -- Set to True to generate warnings for redundant constructs (e.g. useless
1869 -- assignments/conversions). The default is that this warning is disabled.
1870 -- Modified by use of -gnatwr/R.
1872 Warn_On_Reverse_Bit_Order : Boolean := True;
1874 -- Set to True to generate warning (informational) messages for component
1875 -- clauses that are affected by non-standard bit-order. The default is
1876 -- that this warning is enabled. Modified by -gnatw.v/.V.
1878 Warn_On_Suspicious_Contract : Boolean := True;
1880 -- Set to True to generate warnings for suspicious contracts expressed as
1881 -- pragmas or aspects precondition and postcondition, as well as other
1882 -- suspicious cases of expressions typically found in contracts like
1883 -- quantified expressions and uses of Update attribute. The default is that
1884 -- this warning is enabled. Modified by use of -gnatw.t/.T.
1886 Warn_On_Suspicious_Modulus_Value : Boolean := True;
1888 -- Set to True to generate warnings for suspicious modulus values. The
1889 -- default is that this warning is enabled. Modified by -gnatw.m/.M.
1891 Warn_On_Unchecked_Conversion : Boolean := True;
1893 -- Set to True to generate warnings for unchecked conversions that may have
1894 -- non-portable semantics (e.g. because sizes of types differ). Modified
1895 -- by use of -gnatwz/Z.
1897 Warn_On_Unordered_Enumeration_Type : Boolean := False;
1899 -- Set to True to generate warnings for inappropriate uses (comparisons
1900 -- and explicit ranges) on unordered enumeration types (which includes
1901 -- all enumeration types for which pragma Ordered is not given). The
1902 -- default is that this warning is disabled. Modified by -gnat.u/.U.
1904 Warn_On_Unrecognized_Pragma : Boolean := True;
1906 -- Set to True to generate warnings for unrecognized pragmas. The default
1907 -- is that this warning is enabled. Modified by use of -gnatwg/G.
1909 Warn_On_Unrepped_Components : Boolean := False;
1911 -- Set to True to generate warnings for the case of components of record
1912 -- which have a record representation clause but this component does not
1913 -- have a component clause. Modified by use of -gnatw.c/.C.
1915 Warn_On_Warnings_Off : Boolean := False;
1917 -- Set to True to generate warnings for use of Pragma Warnings (Off, ent),
1918 -- where either the pragma is never used, or it could be replaced by a
1919 -- pragma Unmodified or Unreferenced. Also generates warnings for pragma
1920 -- Warning (Off, string) which either has no matching pragma Warning On,
1921 -- or where no warning has been suppressed by the use of the pragma.
1922 -- Modified by use of -gnatw.w/.W.
1924 type Warning_Mode_Type is
1925 (Suppress, Normal, Treat_As_Error, Treat_Run_Time_Warnings_As_Errors);
1926 Warning_Mode : Warning_Mode_Type := Normal;
1928 -- Controls treatment of warning messages. If set to Suppress, warning
1929 -- messages are not generated at all. In Normal mode, they are generated
1930 -- but do not count as errors. In Treat_As_Error mode, warning messages are
1931 -- generated and treated as errors, except for warnings emitted by the
1932 -- Compile_Time_Warning pragma. In Treat_Run_Time_Warnings_As_Errors,
1933 -- warning messages regarding errors raised at run time are treated as
1934 -- errors. Note that Warning_Mode = Suppress causes pragma Warnings to be
1935 -- ignored (except for legality checks), unless we are in GNATprove_Mode,
1936 -- which requires pragma Warnings to be stored for the formal verification
1939 Wide_Character_Encoding_Method : WC_Encoding_Method := WCEM_Brackets;
1941 -- Method used for encoding wide characters in the source program. See
1942 -- description of type in unit System.WCh_Con for a list of the methods
1943 -- that are currently supported. Note that brackets notation is always
1944 -- recognized in source programs regardless of the setting of this
1945 -- variable. The default setting causes only the brackets notation to be
1946 -- recognized. If this is the main unit, this setting also controls the
1947 -- output of the W=? parameter in the ALI file, which is used to provide
1948 -- the default for encoding [Wide_[Wide_]]Text_IO files. For the binder,
1949 -- the value set here overrides this main unit default.
1951 Wide_Character_Encoding_Method_Specified : Boolean := False;
1953 -- Set True if the value in Wide_Character_Encoding_Method was set as
1954 -- a result of an explicit -gnatW? or -W? switch. False otherwise.
1956 Xref_Active : Boolean := True;
1958 -- Set if cross-referencing is enabled (i.e. xref info in ALI files)
1960 Zero_Formatting : Boolean := False;
1962 -- Do no formatting (no title, no leading spaces, no empty lines) in
1963 -- auxiliary outputs (-e, -K, -l, -R).
1965 ----------------------------
1966 -- Configuration Settings --
1967 ----------------------------
1969 -- These are settings that are used to establish the mode at the start of
1970 -- each unit. The values defined below can be affected either by command
1971 -- line switches, or by the use of appropriate configuration pragmas in a
1972 -- configuration pragma file (but NOT by a local use of a configuration
1973 -- pragma in a single file).
1975 Ada_Version_Config : Ada_Version_Type;
1977 -- This is the value of the configuration switch for the Ada 83 mode, as
1978 -- set by the command line switches -gnat83/95/2005/2012, and possibly
1979 -- modified by the use of configuration pragmas Ada_*. This switch is used
1980 -- to set the initial value for Ada_Version mode at the start of analysis
1981 -- of a unit. Note however that the setting of this flag is ignored for
1982 -- internal and predefined units (which are always compiled in the most up
1983 -- to date version of Ada).
1985 Ada_Version_Pragma_Config : Node_Id;
1986 -- This will be set nonempty if it is set by a configuration pragma
1988 Ada_Version_Explicit_Config : Ada_Version_Type;
1990 -- This is set in the same manner as Ada_Version_Config. The difference is
1991 -- that the setting of this flag is not ignored for internal and predefined
1992 -- units, which for some purposes do indeed access this value, regardless
1993 -- of the fact that they are compiled the most up to date ada version).
1995 Assertions_Enabled_Config : Boolean;
1997 -- This is the value of the configuration switch for assertions enabled
1998 -- mode, as possibly set by the command line switch -gnata, and possibly
1999 -- modified by the use of the configuration pragma Assertion_Policy.
2001 Assume_No_Invalid_Values_Config : Boolean;
2003 -- This is the value of the configuration switch for assuming "no invalid
2004 -- values enabled" mode, as possibly set by the command line switch
2005 -- -gnatB, and possibly modified by the use of the configuration pragma
2006 -- Assume_No_Invalid_Values.
2008 Check_Float_Overflow_Config : Boolean;
2010 -- Set to True to check that operations on predefined unconstrained float
2011 -- types (e.g. Float, Long_Float) do not overflow and generate infinities
2012 -- or invalid values. Set by the Check_Float_Overflow pragma, or by use
2013 -- of the -gnateF switch.
2015 Check_Policy_List_Config : Node_Id;
2017 -- This points to the list of N_Pragma nodes for Check_Policy pragmas
2018 -- that are linked through the Next_Pragma fields, with the list being
2019 -- terminated by Empty. The order is most recently processed first. This
2020 -- list includes only those pragmas in configuration pragma files.
2022 Default_Pool_Config : Node_Id := Empty;
2024 -- Same as Default_Pool above, except this is only for Default_Storage_Pool
2025 -- pragmas that are configuration pragmas.
2027 Default_SSO_Config : Character := ' ';
2029 -- Set if a pragma Default_Scalar_Storage_Order appears as a configuration
2030 -- pragma. A value of ' ' means that no pragma was given, otherwise the
2031 -- value is 'H' for High_Order_First or 'L' for Low_Order_First.
2033 Dynamic_Elaboration_Checks_Config : Boolean := False;
2035 -- Set True for dynamic elaboration checking mode, as set by the -gnatE
2036 -- switch or by the use of pragma Elaboration_Checking (Dynamic).
2038 Exception_Locations_Suppressed_Config : Boolean := False;
2040 -- Set True by use of the configuration pragma Suppress_Exception_Messages
2042 Extensions_Allowed_Config : Boolean;
2044 -- This is the flag that indicates whether extensions are allowed. It can
2045 -- be set True either by use of the -gnatX switch, or by use of the
2046 -- configuration pragma Extensions_Allowed (On). It is always set to True
2047 -- for internal GNAT units, since extensions are always permitted in such
2050 External_Name_Exp_Casing_Config : External_Casing_Type;
2052 -- This is the value of the configuration switch that controls casing of
2053 -- external symbols for which an explicit external name is given. It can be
2054 -- set to Uppercase by the command line switch -gnatF, and further modified
2055 -- by the use of the configuration pragma External_Name_Casing in the
2056 -- gnat.adc file. This flag is used to set the initial value for
2057 -- External_Name_Exp_Casing at the start of analyzing each unit. Note
2058 -- however that the setting of this flag is ignored for internal and
2059 -- predefined units (which are always compiled with As_Is mode).
2061 External_Name_Imp_Casing_Config : External_Casing_Type;
2063 -- This is the value of the configuration switch that controls casing of
2064 -- external symbols where the external name is implicitly given. It can be
2065 -- set to Uppercase by the command line switch -gnatF, and further modified
2066 -- by the use of the configuration pragma External_Name_Casing in the
2067 -- gnat.adc file. This flag is used to set the initial value for
2068 -- External_Name_Imp_Casing at the start of analyzing each unit. Note
2069 -- however that the setting of this flag is ignored for internal and
2070 -- predefined units (which are always compiled with Lowercase mode).
2072 Fast_Math_Config : Boolean;
2074 -- This is the value of the configuration switch that controls Fast_Math
2075 -- mode, as set by a Fast_Math pragma in configuration pragmas. It is
2076 -- used to set the initial value of Fast_Math at the start of each new
2077 -- compilation unit.
2079 Initialize_Scalars_Config : Boolean;
2081 -- This is the value of the configuration switch that is set by the
2082 -- pragma Initialize_Scalars when it appears in the gnat.adc file.
2083 -- This switch is not set when the pragma appears ahead of a given
2084 -- unit, so it does not affect the compilation of other units.
2086 No_Component_Reordering_Config : Boolean;
2088 -- This is the value of the configuration switch that is set by the
2089 -- pragma No_Component_Reordering when it appears in the gnat.adc file.
2090 -- This flag is used to set the initial value of No_Component_Reordering
2091 -- at the start of each compilation unit, except that it is always set
2092 -- False for predefined units.
2094 No_Exit_Message : Boolean := False;
2095 -- GNATMAKE, GPRBUILD
2096 -- Set with switch --no-exit-message. When True, if there are compilation
2097 -- failures, the builder does not issue an exit error message.
2099 Optimize_Alignment_Config : Character;
2101 -- This is the value of the configuration switch that controls the
2102 -- alignment optimization mode, as set by an Optimize_Alignment pragma.
2103 -- It is used to set the initial value of Optimize_Alignment at the start
2104 -- of each new compilation unit, except that it is always set to 'O' (off)
2105 -- for internal units.
2107 Persistent_BSS_Mode_Config : Boolean;
2109 -- This is the value of the configuration switch that controls whether
2110 -- potentially persistent data is to be placed in the persistent_bss
2111 -- section. It can be set True by use of the pragma Persistent_BSS.
2112 -- This flag is used to set the initial value of Persistent_BSS_Mode
2113 -- at the start of each compilation unit, except that it is always
2114 -- set False for predefined units.
2116 Prefix_Exception_Messages_Config : Boolean;
2117 -- The setting of Prefix_Exception_Messages from configuration pragmas
2119 SPARK_Mode_Config : SPARK_Mode_Type := None;
2121 -- The setting of SPARK_Mode from configuration pragmas
2123 SPARK_Mode_Pragma_Config : Node_Id := Empty;
2124 -- If a SPARK_Mode pragma appeared in the configuration pragmas (setting
2125 -- SPARK_Mode_Config appropriately), then this points to the N_Pragma node.
2127 Uneval_Old_Config : Character;
2129 -- The setting of Uneval_Old from configuration pragmas
2131 Use_VADS_Size_Config : Boolean;
2133 -- This is the value of the configuration switch that controls the use of
2134 -- VADS_Size instead of Size wherever the attribute Size is used. It can
2135 -- be set True by the use of the pragma Use_VADS_Size in the gnat.adc file.
2136 -- This flag is used to set the initial value for Use_VADS_Size at the
2137 -- start of analyzing each unit. Note however that the setting of this flag
2138 -- is ignored for internal and predefined units (which are always compiled
2139 -- with the standard Size semantics).
2141 type Config_Switches_Type is private;
2142 -- Type used to save values of the switches set from Config values
2144 procedure Register_Config_Switches;
2145 -- This procedure is called after processing the gnat.adc file and other
2146 -- configuration pragma files to record the values of the Config switches,
2147 -- as possibly modified by the use of command line switches and pragmas
2148 -- appearing in these files.
2150 procedure Restore_Config_Switches (Save : Config_Switches_Type);
2151 -- This procedure restores a set of switch values previously saved by a
2152 -- call to Save_Config_Switches.
2154 function Save_Config_Switches return Config_Switches_Type;
2155 -- Return the current state of all configuration-related attributes
2157 procedure Set_Config_Switches
2158 (Internal_Unit : Boolean;
2159 Main_Unit : Boolean);
2160 -- This procedure sets the switches to the appropriate initial values. The
2161 -- parameter Internal_Unit is True for an internal or predefined unit, and
2162 -- affects the way the switches are set (see above). Main_Unit is true if
2163 -- switches are being set for the main unit or for the spec of the main
2164 -- unit. This affects setting of the assert/debug pragma switches, which
2165 -- are normally set false by default for an internal unit, except when the
2166 -- internal unit is the main unit, in which case we use the command line
2169 ------------------------
2170 -- Other Global Flags --
2171 ------------------------
2173 Building_Static_Dispatch_Tables : Boolean := True;
2174 -- This flag indicates if the backend supports generation of statically
2175 -- allocated dispatch tables. If it is True, then the front end will
2176 -- generate static aggregates for dispatch tables that contain forward
2177 -- references to addresses of subprograms not seen yet, and the back end
2178 -- must be prepared to handle this case. If it is False, then the front end
2179 -- generates assignments to initialize the dispatch table, and there are
2180 -- no such forward references. By default we build statically allocated
2181 -- dispatch tables for all library-level tagged types in all platforms.
2182 -- This behavior can be disabled using switch -gnatd.t which will set
2183 -- this flag to False and revert to the previous dynamic behavior.
2185 Expander_Active : Boolean := False;
2186 -- A flag that indicates if expansion is active (True) or deactivated
2187 -- (False). When expansion is deactivated all calls to expander routines
2188 -- have no effect. Note that the initial setting of False is merely to
2189 -- prevent saving of an undefined value for an initial call to the
2190 -- Expander_Mode_Save_And_Set procedure. For more information on the use of
2191 -- this flag, see package Expander. Indeed this flag might more logically
2192 -- be in the spec of Expander, but it is referenced by Errout, and it
2193 -- really seems wrong for Errout to depend on Expander.
2195 Tagged_Seen : Boolean := False;
2196 -- Set True by the parser if the "tagged" reserved word is seen. This is
2197 -- needed in Exp_Put_Image (see that package for documentation).
2199 -----------------------------------
2200 -- Modes for Formal Verification --
2201 -----------------------------------
2203 GNATprove_Mode : Boolean := False;
2204 -- Specific compiling mode targeting formal verification for those parts
2205 -- of the input code that belong to the SPARK 2014 subset of Ada. Set True
2206 -- by the gnat2why executable or by use of the -gnatd.F debug switch. Note
2207 -- that this is completely separate from the SPARK restriction defined in
2208 -- GNAT to detect violations of a subset of SPARK 2005 rules.
2210 ---------------------------
2211 -- Error/Warning Control --
2212 ---------------------------
2214 -- The following array would more reasonably be located in Err_Vars or
2215 -- Errout, but we put them here to deal with licensing issues (we need
2216 -- this to have the GPL exception licensing, since these variables and
2217 -- subprograms are accessed from units with this licensing).
2219 Warnings_As_Errors : array (1 .. 10_000) of String_Ptr;
2220 -- Table for recording Warning_As_Error pragmas as they are processed. It
2221 -- would be nicer to use Table, but there are circular elaboration problems
2222 -- if we try to do this, and an attempt to find some other appropriately
2223 -- licensed unit to declare this as a Table failed with various elaboration
2226 Warnings_As_Errors_Count : Natural;
2228 -- Number of entries stored in Warnings_As_Errors table
2230 Warnings_As_Errors_Count_Config : Natural;
2232 -- Count of pattern strings stored from Warning_As_Error pragmas
2238 GNAT_Mode : Boolean := False;
2240 -- True if compiling in GNAT system mode (-gnatg switch)
2242 -- WARNING: There is a matching C declaration of this variable in fe.h
2244 GNAT_Mode_Config : Boolean := False;
2246 -- True if -gnatg switch is present. GNAT_Mode may be temporary set to
2247 -- True during the analysis of a system unit, but GNAT_Mode_Config must
2248 -- not change once scanned and set.
2250 -- Setting GNAT mode has the following effects on the language that is
2251 -- accepted. Note that several of the following have the effect of changing
2252 -- an error to a warning. But warnings are usually treated as fatal errors
2253 -- in -gnatg mode, so to actually take advantage of such a change, it is
2254 -- necessary to add an explicit pragma Warnings (Off) in the source and
2255 -- this requires clear documentation of why this is necessary.
2257 -- The identifier character set is set to 'n' (7-bit ASCII)
2259 -- Pragma Extend_System is ignored
2261 -- Warning_Mode is set to Treat_As_Error (-gnatwe)
2263 -- Standard style checks are set (See Set_GNAT_Style_Check_Options)
2265 -- Standard warnings are turned on (see Set_GNAT_Mode_Warnings)
2267 -- The Ada version is set to Ada 2012
2269 -- Task priorities are always allowed to be in the range Any_Priority
2271 -- Overflow checks are suppressed, overflow checking set to strict mode
2273 -- ALI files are always generated for predefined generic packages
2275 -- Obsolescent feature warnings are suppressed
2277 -- Recompilation of children of GNAT, System, Ada, Interfaces is allowed
2279 -- The Scalar_Storage_Order attribute applies to generic types
2281 -- Categorization errors are treated as warnings rather than errors
2283 -- Statements in preelaborated units give warnings rather than errors
2285 -- Private objects are allowed in preelaborated units
2287 -- Non-static constants in preelaborated units give warnings not errors
2289 -- The warning about component size being ignored is suppressed
2291 -- The warning about size clauses being ignored is suppressed
2293 -- Initializing limited types gives a warning rather than an error
2295 -- Copying of limited objects is allowed
2297 -- Returning objects of limited types is allowed
2299 -- Non-static call in preelaborated unit give a warning, not an error
2301 -- Warnings on possible elaboration errors are suppressed
2303 -- Warnings about packing being ignored are suppressed
2305 -- Warnings in internal units are not suppressed (they normally are)
2307 -- The only special comment sequence allowed is --!
2309 --------------------------
2310 -- Private Declarations --
2311 --------------------------
2314 -- The following type is used to save and restore settings of switches in
2315 -- Opt that represent the configuration (i.e. result of config pragmas).
2317 -- Note that Ada_Version_Explicit is not included, since this is a sticky
2318 -- flag that once set does not get reset, since the whole idea of this flag
2319 -- is to record the setting for the main unit.
2321 type Config_Switches_Type is record
2322 Ada_Version : Ada_Version_Type;
2323 Ada_Version_Explicit : Ada_Version_Type;
2324 Ada_Version_Pragma : Node_Id;
2325 Assertions_Enabled : Boolean;
2326 Assume_No_Invalid_Values : Boolean;
2327 Check_Float_Overflow : Boolean;
2328 Check_Policy_List : Node_Id;
2329 Default_Pool : Node_Id;
2330 Default_SSO : Character;
2331 Dynamic_Elaboration_Checks : Boolean;
2332 Exception_Locations_Suppressed : Boolean;
2333 Extensions_Allowed : Boolean;
2334 External_Name_Exp_Casing : External_Casing_Type;
2335 External_Name_Imp_Casing : External_Casing_Type;
2336 Fast_Math : Boolean;
2337 Initialize_Scalars : Boolean;
2338 No_Component_Reordering : Boolean;
2339 Normalize_Scalars : Boolean;
2340 Optimize_Alignment : Character;
2341 Optimize_Alignment_Local : Boolean;
2342 Persistent_BSS_Mode : Boolean;
2343 Prefix_Exception_Messages : Boolean;
2344 SPARK_Mode : SPARK_Mode_Type;
2345 SPARK_Mode_Pragma : Node_Id;
2346 Uneval_Old : Character;
2347 Use_VADS_Size : Boolean;
2348 Warnings_As_Errors_Count : Natural;
2351 -- The following declarations are for GCC version dependent flags. We do
2352 -- not let client code in the compiler test GCC_Version directly, but
2353 -- instead use deferred constants for relevant feature tags.
2355 -- Note: there currently are no such constants defined in this section,
2356 -- since the compiler front end is currently entirely independent of the
2357 -- GCC version, which is a desirable state of affairs.
2359 function get_gcc_version return Int;
2360 pragma Import (C, get_gcc_version, "get_gcc_version");
2362 GCC_Version : constant Nat := get_gcc_version;
2364 -- Indicates which version of gcc is in use (3 = 3.x, 4 = 4.x). Note that
2365 -- gcc 2.8.1 (which used to be a value of 2) is no longer supported.
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