1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
9 -- Copyright (C) 1992-2016, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 3, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. --
18 -- As a special exception under Section 7 of GPL version 3, you are granted --
19 -- additional permissions described in the GCC Runtime Library Exception, --
20 -- version 3.1, as published by the Free Software Foundation. --
22 -- You should have received a copy of the GNU General Public License and --
23 -- a copy of the GCC Runtime Library Exception along with this program; --
24 -- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
25 -- <http://www.gnu.org/licenses/>. --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
30 ------------------------------------------------------------------------------
32 -- This package contains global flags set by the initialization routine from
33 -- the command line and referenced throughout the compiler, the binder, or
34 -- other GNAT tools. The comments indicate which options are used by which
35 -- programs (GNAT, GNATBIND, GNATLINK, GNATMAKE, etc).
37 -- Some flags are labelled "PROJECT MANAGER". These are used by tools that
38 -- use the Project Manager. These tools include gnatmake, gnatname, the gnat
39 -- driver, gnatclean, gprbuild and gprclean.
41 with Hostparm; use Hostparm;
42 with Types; use Types;
44 pragma Warnings (Off);
45 -- This package is used also by gnatcoll
46 with System.Strings; use System.Strings;
47 with System.WCh_Con; use System.WCh_Con;
52 ----------------------
53 -- Checksum Control --
54 ----------------------
56 -- Checksums are computed for sources to check for sources being the same
57 -- from a compilation point of view (e.g. spelling of identifiers and
58 -- white space layout do not count in this computation).
60 -- The way the checksum is computed has evolved across the various versions
61 -- of GNAT. When gprbuild is called with -m, the checksums must be computed
62 -- the same way in gprbuild as it was in the GNAT version of the compiler.
63 -- The different ways are
65 -- Version 6.4 and later:
67 -- The Accumulate_Token_Checksum procedure is called after each numeric
68 -- literal and each identifier/keyword. For keywords, Tok_Identifier is
69 -- used in the call to Accumulate_Token_Checksum.
71 -- Versions 5.04 to 6.3:
73 -- For keywords, the token value were used in the call to procedure
74 -- Accumulate_Token_Checksum. Type Token_Type did not include Tok_Some.
78 -- For keywords, the token value were used in the call to
79 -- Accumulate_Token_Checksum. Type Token_Type did not include
80 -- Tok_Interface, Tok_Overriding, Tok_Synchronized and Tok_Some.
82 -- Versions 5.02 and before:
84 -- No calls to procedure Accumulate_Token_Checksum (the checksum
85 -- mechanism was introduced in version 5.03).
87 -- To signal to the scanner whether Accumulate_Token_Checksum needs to be
88 -- called and what versions to call, the following Boolean flags are used:
90 Checksum_Accumulate_Token_Checksum : Boolean := True;
92 -- Set to False by gprbuild when the version of GNAT is 5.02 or before. If
93 -- this switch is False, then we do not call Accumulate_Token_Checksum, so
94 -- the setting of the following two flags is irrelevant.
96 Checksum_GNAT_6_3 : Boolean := False;
98 -- Set to True by gprbuild when the version of GNAT is 6.3 or before.
100 Checksum_GNAT_5_03 : Boolean := False;
102 -- Set to True by gprbuild when the version of GNAT is 5.03 or before.
104 ----------------------------------------------
105 -- Settings of Modes for Current Processing --
106 ----------------------------------------------
108 -- The following mode values represent the current state of processing.
109 -- The values set here are the default values. Unless otherwise noted,
110 -- the value may be reset in Switch-? with an appropriate switch. In
111 -- some cases, the values can also be modified by pragmas, and in the
112 -- case of some binder variables, Gnatbind.Scan_Bind_Arg may modify
113 -- the default values.
115 Latest_Ada_Only : Boolean := False;
116 -- If True, the only value valid for Ada_Version is Ada_Version_Type'Last,
117 -- trying to specify other values will be ignored (in case of pragma
118 -- Ada_xxx) or generate an error (in case of -gnat83/95/xx switches).
120 type Ada_Version_Type is (Ada_83, Ada_95, Ada_2005, Ada_2012);
121 pragma Ordered (Ada_Version_Type);
122 -- Versions of Ada for Ada_Version below. Note that these are ordered,
123 -- so that tests like Ada_Version >= Ada_95 are legitimate and useful.
124 -- Think twice before using "="; Ada_Version >= Ada_2012 is more likely
125 -- what you want, because it will apply to future versions of the language.
127 Ada_Version_Default : constant Ada_Version_Type := Ada_2012;
128 pragma Warnings (Off, Ada_Version_Default);
130 -- Default Ada version if no switch given. The Warnings off is to kill
131 -- constant condition warnings.
133 Ada_Version : Ada_Version_Type := Ada_Version_Default;
135 -- Current Ada version for compiler, as set by configuration pragmas,
136 -- compiler switches, or implicitly (to Ada_Version_Runtime) when a
137 -- predefined or internal file is compiled.
139 Ada_Version_Pragma : Node_Id := Empty;
140 -- Reflects the Ada_xxx pragma that resulted in setting Ada_Version. Used
141 -- to specialize error messages complaining about the Ada version in use.
143 Ada_Version_Explicit : Ada_Version_Type := Ada_Version_Default;
145 -- Like Ada_Version, but does not get set implicitly for predefined or
146 -- internal units, so it reflects the Ada version explicitly set using
147 -- configuration pragmas or compiler switches (or if neither appears, it
148 -- remains set to Ada_Version_Default). This is used in the rare cases
149 -- (notably pragma Obsolescent) where we want the explicit version set.
151 Ada_Version_Runtime : Ada_Version_Type := Ada_2012;
153 -- Ada version used to compile the runtime. Used to set Ada_Version (but
154 -- not Ada_Version_Explicit) when compiling predefined or internal units.
156 Ada_Final_Suffix : constant String := "final";
157 Ada_Final_Name : String_Ptr := new String'("ada" & Ada_Final_Suffix);
159 -- The name of the procedure that performs the finalization at the end of
160 -- execution. This variable may be modified by Gnatbind.Scan_Bind_Arg.
162 Ada_Init_Suffix : constant String := "init";
163 Ada_Init_Name : String_Ptr := new String'("ada" & Ada_Init_Suffix);
165 -- The name of the procedure that performs initialization at the start
166 -- of execution. This variable may be modified by Gnatbind.Scan_Bind_Arg.
168 Ada_Main_Name_Suffix : constant String := "main";
170 -- The suffix for Ada_Main_Name. Defined as a constant here so that it
171 -- can be referenced in a uniform manner to create either the default
172 -- value of Ada_Main_Name (declared below), or the non-default name
173 -- set by Gnatbind.Scan_Bind_Arg.
175 Ada_Main_Name : String_Ptr := new String'("ada_" & Ada_Main_Name_Suffix);
177 -- The name of the Ada package generated by the binder (when in Ada mode).
178 -- This variable may be modified by Gnatbind.Scan_Bind_Arg.
180 Address_Clause_Overlay_Warnings : Boolean := True;
182 -- Set False to disable address clause warnings. Modified by use of
185 Address_Is_Private : Boolean := False;
187 -- Set True if package System has the line "type Address is private;"
189 All_Errors_Mode : Boolean := False;
191 -- Flag set to force display of multiple errors on a single line and
192 -- also repeated error messages for references to undefined identifiers
193 -- and certain other repeated error messages. Set by use of -gnatf.
195 Allow_Integer_Address : Boolean := False;
197 -- Allow use of integer expression in a context requiring System.Address.
198 -- Set by the use of configuration pragma Allow_Integer_Address Also set
199 -- in relaxed semantics mode for use by CodePeer or when -gnatd.M is used.
201 All_Sources : Boolean := False;
203 -- Set to True to require all source files to be present. This flag is
204 -- directly modified by gnatmake to affect the shared binder routines.
206 Alternate_Main_Name : String_Ptr := null;
208 -- Set to non-null when Bind_Alternate_Main_Name is True. This value
209 -- is modified as needed by Gnatbind.Scan_Bind_Arg.
211 ASIS_Mode : Boolean := False;
213 -- Enable semantic checks and tree transformations that are important
214 -- for ASIS but that are usually skipped if Operating_Mode is set to
215 -- Check_Semantics. This flag does not have the corresponding option to set
216 -- it ON. It is set ON when Tree_Output is set ON, it can also be set ON
217 -- from the code of GNSA-based tool (a client may need to set ON the
218 -- Back_Annotate_Rep_Info flag in this case. At the moment this does not
219 -- make very much sense, because GNSA cannot do back annotation).
221 Assertions_Enabled : Boolean := False;
223 -- Indicates default policy (True = Check, False = Ignore) to be applied
224 -- to all assertion aspects and pragmas, and to pragma Debug, if there is
225 -- no overriding Assertion_Policy, Check_Policy, or Debug_Policy pragma.
226 -- Set True by use of -gnata.
228 Assume_No_Invalid_Values : Boolean := False;
229 -- GNAT Normally, in accordance with (RM 13.9.1 (9-11)) the front end
230 -- assumes that values could have invalid representations, unless it can
231 -- clearly prove that the values are valid. If this switch is set (by
232 -- pragma Assume_No_Invalid_Values (On)), then the compiler assumes values
233 -- are valid and in range of their representations. This feature is now
234 -- fully enabled in the compiler.
236 Back_Annotate_Rep_Info : Boolean := False;
238 -- If set True, enables back annotation of representation information
239 -- by gigi, even in -gnatc mode. This is set True by the use of -gnatR
240 -- (list representation information) or -gnatt (generate tree). It is
241 -- also set true if certain Unchecked_Conversion instantiations require
242 -- checking based on annotated values.
244 Back_End_Handles_Limited_Types : Boolean;
245 -- This flag is set true if the back end can properly handle limited or
246 -- other by reference types, and avoid copies. If this flag is False, then
247 -- the front end does special expansion for if/case expressions to make
248 -- sure that no copy occurs. If the flag is True, then the expansion for
249 -- if and case expressions relies on the back end properly handling things.
250 -- Currently the default is False for all cases (set in gnat1drv). The
251 -- default can be modified using -gnatd.L (sets the flag True). This is
252 -- used to test the possibility of having the backend handle this.
254 Back_End_Inlining : Boolean := False;
256 -- Set True to activate inlining by back-end expansion. This is the normal
257 -- default mode for gcc targets, so it is True on such targets unless the
258 -- switches -gnatN or -gnatd.z are used. See circuitry in gnat1drv for the
259 -- exact conditions for setting this switch.
261 Bind_Alternate_Main_Name : Boolean := False;
263 -- True if main should be called Alternate_Main_Name.all.
264 -- This variable may be set to True by Gnatbind.Scan_Bind_Arg.
266 Bind_Main_Program : Boolean := True;
268 -- Set to False if not binding main Ada program
270 Bind_For_Library : Boolean := False;
272 -- Set to True if the binder needs to generate a file designed for building
273 -- a library. May be set to True by Gnatbind.Scan_Bind_Arg.
275 Bind_Only : Boolean := False;
276 -- GNATMAKE, GPRBUILD
277 -- Set to True to skip compile and link steps
278 -- (except when Compile_Only and/or Link_Only are True).
280 Blank_Deleted_Lines : Boolean := False;
282 -- Output empty lines for each line of preprocessed input that is deleted
283 -- in the output, including preprocessor lines starting with a '#'.
285 Brief_Output : Boolean := False;
287 -- Force brief error messages to standard error, even if verbose mode is
288 -- set (so that main error messages go to standard output).
290 Build_Bind_And_Link_Full_Project : Boolean := False;
292 -- Set to True to build, bind and link all the sources of a project file
295 Check_Aliasing_Of_Parameters : Boolean := False;
297 -- Set to True to detect whether subprogram parameters and function results
298 -- alias the same object(s).
300 Check_Float_Overflow : Boolean := False;
302 -- Set to True to check that operations on predefined unconstrained float
303 -- types (e.g. Float, Long_Float) do not overflow and generate infinities
304 -- or invalid values. Set by the Check_Float_Overflow pragma, or by use
305 -- of the -gnateF switch.
307 Check_Object_Consistency : Boolean := False;
308 -- GNATBIND, GNATMAKE
309 -- Set to True to check whether every object file is consistent with its
310 -- corresponding ada library information (ALI) file. An object file is
311 -- inconsistent with the corresponding ALI file if the object file does
312 -- not exist or if it has an older time stamp than the ALI file. Default
313 -- above is for GNATBIND. GNATMAKE overrides this default to True (see
314 -- Make.Initialize) since we normally do need to check source consistencies
317 Check_Only : Boolean := False;
319 -- Set to True to do checks only, no output of binder file
321 Check_Policy_List : Node_Id := Empty;
323 -- This points to the list of N_Pragma nodes for Check_Policy pragmas
324 -- that are linked through the Next_Pragma fields, with the list being
325 -- terminated by Empty. The order is most recently processed first. Note
326 -- that Push_Scope and Pop_Scope in Sem_Ch8 save and restore the value
327 -- of this variable, implementing the required scope control for pragmas
328 -- appearing in a declarative part.
330 Check_Readonly_Files : Boolean := False;
332 -- Set to True to check readonly files during the make process
334 Check_Source_Files : Boolean := True;
335 -- GNATBIND, GNATMAKE
336 -- Set to True to enable consistency checking for any source files that
337 -- are present (i.e. date must match the date in the library info file).
338 -- Set to False for object file consistency check only. This flag is
339 -- directly modified by gnatmake, to affect the shared binder routines.
341 Check_Switches : Boolean := False;
343 -- Set to True to check compiler options during the make process
345 Check_Unreferenced : Boolean := False;
347 -- Set to True to enable checking for unreferenced entities other
348 -- than formal parameters (for which see Check_Unreferenced_Formals)
349 -- Modified by use of -gnatwu/U.
351 Check_Unreferenced_Formals : Boolean := False;
353 -- Set to True to check for unreferenced formals. This is turned on by
354 -- -gnatwa/wf/wu and turned off by -gnatwA/wF/wU.
356 Check_Validity_Of_Parameters : Boolean := False;
358 -- Set to True to check for proper scalar initialization of subprogram
359 -- parameters on both entry and exit. Turned on by??? turned off by???
361 Check_Withs : Boolean := False;
363 -- Set to True to enable checking for unused withs, and also the case
364 -- of withing a package and using none of the entities in the package.
365 -- Modified by use of -gnatwu/U.
367 CodePeer_Mode : Boolean := False;
368 -- GNAT, GNATBIND, GPRBUILD
369 -- Enable full CodePeer mode (SCIL generation, disable switches that
370 -- interact badly with it, etc...). This is turned on by -gnatC.
372 Commands_To_Stdout : Boolean := False;
374 -- True if echoed commands to be written to stdout instead of stderr
376 Comment_Deleted_Lines : Boolean := False;
378 -- True if source lines removed by the preprocessor should be commented
379 -- in the output file.
381 Compilation_Time : String (1 .. 19);
383 -- Compilation date and time in form YYYY-MM-DD HH:MM:SS
385 Compile_Only : Boolean := False;
386 -- GNATMAKE, GNATCLEAN, GPBUILD, GPRCLEAN
387 -- GNATMAKE, GPRBUILD:
388 -- set True to skip bind and link steps (except when Bind_Only is True)
389 -- GNATCLEAN, GPRCLEAN:
390 -- set True to delete only the files produced by the compiler but not the
391 -- library files or the executable files.
393 Compiler_Unit : Boolean := False;
395 -- Set True by an occurrence of pragma Compiler_Unit_Warning (or of the
396 -- obsolete pragma Compiler_Unit) in the main unit. Once set True, stays
397 -- True, since any units that are with'ed directly or indirectly by
398 -- a Compiler_Unit_Warning main unit are subject to the same restrictions.
399 -- Such units really should have their own pragmas, but we do not bother to
400 -- check for that, so this transitivity provides extra checking.
402 Config_File : Boolean := True;
404 -- Set to False to inhibit reading and processing of gnat.adc file
406 Config_File_Names : String_List_Access := null;
408 -- Names of configuration pragmas files (given by switches -gnatec)
410 Configurable_Run_Time_Mode : Boolean := False;
412 -- Set True if the compiler is operating in configurable run-time mode.
413 -- This happens if the flag Targparm.Configurable_Run_TimeMode_On_Target
414 -- is set True, or if pragma No_Run_Time is used. See the spec of Rtsfind
415 -- for details on the handling of the latter pragma.
417 Constant_Condition_Warnings : Boolean := False;
419 -- Set to True to activate warnings on constant conditions. Modified by
422 Create_Mapping_File : Boolean := False;
424 -- Set to True (-C switch) to indicate that the compiler will be invoked
425 -- with a mapping file (-gnatem compiler switch).
427 subtype Debug_Level_Value is Nat range 0 .. 3;
428 Debugger_Level : Debug_Level_Value := 0;
430 -- The value given to the -g parameter. The default value for -g with
431 -- no value is 2. If no -g is specified, defaults to 0.
432 -- Note that the generated code should never depend on this variable,
433 -- since we want debug info to be nonintrusive on the generate code.
435 Default_Exit_Status : Int := 0;
437 -- Set the default exit status value. Set by the -Xnnn switch for the
440 Debug_Generated_Code : Boolean := False;
442 -- Set True (-gnatD switch) to debug generated expanded code instead
443 -- of the original source code. Causes debugging information to be
444 -- written with respect to the generated code file that is written.
446 Default_Pool : Node_Id := Empty;
448 -- Used to record the storage pool name (or null literal) that is the
449 -- argument of an applicable pragma Default_Storage_Pool.
450 -- Empty: No pragma Default_Storage_Pool applies.
451 -- N_Null node: "pragma Default_Storage_Pool (null);" applies.
452 -- otherwise: "pragma Default_Storage_Pool (X);" applies, and
453 -- this points to the name X.
454 -- Push_Scope and Pop_Scope in Sem_Ch8 save and restore this value.
455 Default_Stack_Size : Int := -1;
457 -- Set to default primary stack size in units of bytes. Set by
458 -- the -dnnn switch for the binder. A value of -1 indicates that no
459 -- default was set by the binder.
461 Default_Sec_Stack_Size : Int := -1;
463 -- Set to default secondary stack size in units of bytes. Set by
464 -- the -Dnnn switch for the binder. A value of -1 indicates that no
465 -- default was set by the binder, and that the default should be the
466 -- initial value of System.Secondary_Stack.Default_Secondary_Stack_Size.
468 Default_SSO : Character := ' ';
470 -- Set if a pragma Default_Scalar_Storage_Order has been given. The value
471 -- of ' ' indicates that no default has been set, otherwise the value is
472 -- either 'H' for High_Order_First or 'L' for Lower_Order_First.
474 Detect_Blocking : Boolean := False;
476 -- Set True to force the run time to raise Program_Error if calls to
477 -- potentially blocking operations are detected from protected actions.
479 Directories_Must_Exist_In_Projects : Boolean := True;
481 -- Set to False with switch -f of gnatclean and gprclean
483 Display_Compilation_Progress : Boolean := False;
484 -- GNATMAKE, GPRBUILD
485 -- Set True (-d switch) to display information on progress while compiling
486 -- files. Internal flag to be used in conjunction with an IDE (e.g GPS).
488 type Distribution_Stub_Mode_Type is
491 -- Normal mode, no generation/compilation of distribution stubs
493 Generate_Receiver_Stub_Body,
494 -- The unit being compiled is the RCI body, and the compiler will
495 -- generate the body for the receiver stubs and compile it.
497 Generate_Caller_Stub_Body);
498 -- The unit being compiled is the RCI spec, and the compiler will
499 -- generate the body for the caller stubs and compile it.
501 Distribution_Stub_Mode : Distribution_Stub_Mode_Type := No_Stubs;
503 -- This enumeration variable indicates the five states of distribution
504 -- annex stub generation/compilation.
506 Do_Not_Execute : Boolean := False;
508 -- Set to True if no actual compilations should be undertaken
510 Dump_Source_Text : Boolean := False;
512 -- Set to True (by -gnatL) to dump source text intermingled with generated
513 -- code. Effective only if either of Debug/Print_Generated_Code is true.
515 Dynamic_Elaboration_Checks : Boolean := False;
517 -- Set True for dynamic elaboration checking mode, as set by the -gnatE
518 -- switch or by the use of pragma Elaboration_Checks (Dynamic).
520 Dynamic_Stack_Measurement : Boolean := False;
522 -- Set True to enable dynamic stack measurement (-u flag for gnatbind)
524 Dynamic_Stack_Measurement_Array_Size : Nat := 100;
526 -- Number of measurements we want to store during dynamic stack analysis.
527 -- When the buffer is full, non-storable results will be output on the fly.
528 -- The value is relevant only if Dynamic_Stack_Measurement is set. Set
529 -- by processing of -u flag for gnatbind.
531 Elab_Dependency_Output : Boolean := False;
533 -- Set to True to output complete list of elaboration constraints
535 Elab_Order_Output : Boolean := False;
537 -- Set to True to output chosen elaboration order
539 Elab_Info_Messages : Boolean := False;
541 -- Set to True to output info messages for static elabmodel (-gnatel)
543 Elab_Warnings : Boolean := False;
545 -- Set to True to generate elaboration warnings (-gnatwl)
547 Error_Msg_Line_Length : Nat := 0;
549 -- Records the error message line length limit. If this is set to zero,
550 -- then we get the old style behavior, in which each call to the error
551 -- message routines generates one line of output as a separate message.
552 -- If it is set to a non-zero value, then continuation lines are folded
553 -- to make a single long message, and then this message is split up into
554 -- multiple lines not exceeding the specified length. Set by -gnatj=nn.
556 Error_To_Warning : Boolean := False;
558 -- If True, then certain error messages (e.g. parameter overlap messages
559 -- for procedure calls in Ada 2012 mode) are treated as warnings instead
560 -- of errors. Set by debug flag -gnatd.E. A search for Error_To_Warning
561 -- will identify affected messages.
563 Exception_Handler_Encountered : Boolean := False;
565 -- This flag is set true if the parser encounters an exception handler.
566 -- It is used to set Warn_On_Exception_Propagation True if the restriction
567 -- No_Exception_Propagation is set.
569 Exception_Extra_Info : Boolean := False;
571 -- True when switch -gnateE is used. When True, generate extra information
572 -- associated with exception messages (in particular range and index
575 Exception_Locations_Suppressed : Boolean := False;
577 -- Set to True if a Suppress_Exception_Locations configuration pragma is
580 type Exception_Mechanism_Type is
581 -- Determines the kind of mechanism used to handle exceptions
584 -- Exceptions use setjmp/longjmp generated explicitly by the front end
585 -- (this includes gigi or other equivalent parts of the code generator).
586 -- AT END handlers are converted into exception handlers by the front
590 -- Exceptions are handled by the back end. The front end simply
591 -- generates the handlers as they appear in the source, and AT END
592 -- handlers are left untouched (they are not converted into exception
593 -- handlers when operating in this mode). Propagation is performed
594 -- using a frame unwinding scheme and requires no particular setup code
595 -- at handler sites on regular execution paths.
598 -- Similar to Back_End_ZCX with respect to the front-end processing
599 -- of regular and AT-END handlers. A setjmp/longjmp scheme is used to
600 -- propagate and setup handler contexts on regular execution paths.
602 pragma Convention (C, Exception_Mechanism_Type);
604 Exception_Mechanism : Exception_Mechanism_Type := Front_End_SJLJ;
606 -- Set to the appropriate value depending on the flags in system.ads
607 -- (Frontend_Exceptions + ZCX_By_Default). The C convention is there to
608 -- allow access by gigi.
610 function Back_End_Exceptions return Boolean;
611 function Front_End_Exceptions return Boolean;
612 function ZCX_Exceptions return Boolean;
613 function SJLJ_Exceptions return Boolean;
615 -- Various properties of the active Exception_Mechanism
617 Exception_Tracebacks : Boolean := False;
619 -- Set to True to store tracebacks in exception occurrences (-Ea or -E)
621 Exception_Tracebacks_Symbolic : Boolean := False;
623 -- Set to True to store tracebacks in exception occurrences and enable
624 -- symbolic tracebacks (-Es).
626 Extensions_Allowed : Boolean := False;
628 -- Set to True by switch -gnatX if GNAT specific language extensions
629 -- are allowed. Currently there are no such defined extensions.
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_Tree_File : Boolean := False;
670 -- Force generation of ALI file even if errors are encountered. Also forces
671 -- generation of tree file if -gnatt is also set. 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 Front_End_Inlining : Boolean := False;
702 -- Set True to activate inlining by front-end expansion (even on GCC
703 -- targets, where inlining is normally handled by the back end). Set by
704 -- the flag -gnatN (which is now considered obsolescent, since the GCC
705 -- back end can do a better job of inlining than the front end these days.
707 Full_Path_Name_For_Brief_Errors : Boolean := False;
709 -- When True, in Brief_Output mode, each error message line will start with
710 -- the full path name of the source. When False, only the file name without
711 -- directory information is used.
713 Full_List : Boolean := False;
715 -- Set True to generate full source listing with embedded errors
717 Full_List_File_Name : String_Ptr := null;
719 -- Set to file name to generate full source listing to named file (or if
720 -- the name is of the form .xxx, then to name.xxx where name is the source
721 -- file name with extension stripped.
723 Generate_C_Code : Boolean := False;
725 -- If True, the Cprint circuitry to generate C code output is activated.
726 -- Set True by use of -gnateg or -gnatd.V.
728 Generate_CodePeer_Messages : Boolean := False;
730 -- Generate CodePeer messages. Ignored if CodePeer_Mode is false. This is
731 -- turned on by -gnateC.
733 Generate_Processed_File : Boolean := False;
735 -- True when switch -gnateG is used. When True, create in a file
736 -- <source>.prep, if the source is preprocessed.
738 Generate_SCIL : Boolean := False;
740 -- Set True to activate SCIL code generation.
742 Generate_SCO : Boolean := False;
744 -- True when switch -fdump-scos (or -gnateS) is used. When True, Source
745 -- Coverage Obligation (SCO) information is generated and output in the ALI
746 -- file. See unit Par_SCO for full details.
748 Generate_SCO_Instance_Table : Boolean := False;
750 -- True when switch -fdump-scos is used. When True, a table of instances is
753 Generating_Code : Boolean := False;
755 -- True if the frontend finished its work and has called the backend to
756 -- process the tree and generate the object file.
758 type Ghost_Mode_Type is (None, Check, Ignore);
759 -- Possible legal modes that can be set by aspect/pragma Ghost as well as
760 -- value None, which indicates that no such aspect/pragma applies.
762 Ghost_Mode : Ghost_Mode_Type := None;
764 -- Current Ghost mode setting
766 Global_Discard_Names : Boolean := False;
768 -- True if a pragma Discard_Names appeared as a configuration pragma for
769 -- the current compilation unit.
771 GNAT_Encodings : Int;
772 pragma Import (C, GNAT_Encodings, "gnat_encodings");
773 -- Constant controlling the balance between GNAT encodings and standard
774 -- DWARF to emit in the debug information. See aamissing.c for definitions
775 -- for the GNAAMP back end. It accepts the following values.
777 DWARF_GNAT_Encodings_All : constant Int := 0;
778 DWARF_GNAT_Encodings_GDB : constant Int := 1;
779 DWARF_GNAT_Encodings_Minimal : constant Int := 2;
781 Identifier_Character_Set : Character;
783 -- This variable indicates the character set to be used for identifiers.
784 -- The possible settings are:
785 -- '1' Latin-1 (ISO-8859-1)
786 -- '2' Latin-2 (ISO-8859-2)
787 -- '3' Latin-3 (ISO-8859-3)
788 -- '4' Latin-4 (ISO-8859-4)
789 -- '5' Latin-Cyrillic (ISO-8859-5)
790 -- '9' Latin-9 (ISO-8859-15)
791 -- 'p' PC (US, IBM page 437)
792 -- '8' PC (European, IBM page 850)
793 -- 'f' Full upper set (all distinct)
794 -- 'n' No upper characters (Ada 83 rules)
795 -- 'w' Latin-1 plus wide characters allowed in identifiers
797 -- The setting affects the set of letters allowed in identifiers and the
798 -- upper/lower case equivalences. It does not affect the interpretation of
799 -- character and string literals, which are always stored using the actual
800 -- coding in the source program. This variable is initialized to the
801 -- default value appropriate to the system (in Osint.Initialize), and then
802 -- reset if a command line switch is used to change the setting.
804 Ignore_Pragma_SPARK_Mode : Boolean := False;
806 -- Set True to ignore the semantics and effects of pragma SPARK_Mode when
807 -- the pragma appears inside an instance whose enclosing context is subject
808 -- to SPARK_Mode "off".
810 Ignore_Rep_Clauses : Boolean := False;
812 -- Set True to ignore all representation clauses. Useful when compiling
813 -- code from foreign compilers for checking or ASIS purposes. Can be
814 -- set True by use of -gnatI.
816 Ignore_Style_Checks_Pragmas : Boolean := False;
818 -- Set True to ignore all Style_Checks pragmas. Can be set True by use
821 Ignore_Unrecognized_VWY_Switches : Boolean := False;
823 -- Set True to ignore unrecognized y, V, w switches. Can be set True
824 -- by use of -gnateu, causing subsequent unrecognized switches to result
825 -- in a warning rather than an error.
827 Implementation_Unit_Warnings : Boolean := True;
829 -- Set True to active warnings for use of implementation internal units.
830 -- Modified by use of -gnatwi/-gnatwI.
832 Implicit_Packing : Boolean := False;
834 -- If set True, then a Size attribute clause on an array is allowed to
835 -- cause implicit packing instead of generating an error message. Set by
836 -- use of pragma Implicit_Packing.
838 Ineffective_Inline_Warnings : Boolean := False;
840 -- Set True to activate warnings if front-end inlining (-gnatN) is not able
841 -- to actually inline a particular call (or all calls). Can be controlled
842 -- by use of -gnatwp/-gnatwP. Also set True to activate warnings if
843 -- frontend inlining is not able to inline a subprogram expected to
844 -- be inlined in GNATprove mode.
846 Init_Or_Norm_Scalars : Boolean := False;
848 -- Set True if a pragma Initialize_Scalars applies to the current unit.
849 -- Also set True if a pragma Restriction (Normalize_Scalars) applies.
851 Initialize_Scalars : Boolean := False;
853 -- Set True if a pragma Initialize_Scalars applies to the current unit.
854 -- Note that Init_Or_Norm_Scalars is also set to True if this is True.
856 Initialize_Scalars_Mode1 : Character := 'I';
857 Initialize_Scalars_Mode2 : Character := 'N';
859 -- Set to two characters from -S switch (IN/LO/HI/EV/xx). The default
860 -- is IN (invalid values), used if no -S switch is used.
862 Inline_Active : Boolean := False;
864 -- Set True to activate pragma Inline processing across modules. Default
865 -- for now is not to inline across module boundaries.
867 Inline_Level : Nat := 0;
869 -- Set to indicate the inlining level: 0 means that an appropriate value is
870 -- to be computed by the compiler based on the optimization level (-gnatn),
871 -- 1 is for moderate inlining across modules (-gnatn1) and 2 for full
872 -- inlining across modules (-gnatn2).
874 Interface_Library_Unit : Boolean := False;
876 -- Set to True to indicate that at least one ALI file is an interface ALI:
877 -- then elaboration flag checks are to be generated in the binder
880 Invalid_Value_Used : Boolean := False;
882 -- Set True if a valid Invalid_Value attribute is encountered
884 Inline_Processing_Required : Boolean := False;
886 -- Set True if inline processing is required. Inline processing is required
887 -- if an active Inline pragma is processed. The flag is set for a pragma
888 -- Inline or Inline_Always that is actually active.
890 In_Place_Mode : Boolean := False;
892 -- Set True to store ALI and object files in place i.e. in the object
893 -- directory if these files already exist or in the source directory
896 Keep_Going : Boolean := False;
897 -- GNATMAKE, GPRBUILD
898 -- When True signals to ignore compilation errors and keep processing
899 -- sources until there is no more work.
901 Keep_Temporary_Files : Boolean := False;
902 -- GNATCMD, GNATMAKE, GPRBUILD
903 -- When True the temporary files are not deleted. Set by switches -dn or
904 -- --keep-temp-files.
906 Leap_Seconds_Support : Boolean := False;
908 -- Set to True to enable leap seconds support in Ada.Calendar and its
911 Link_Only : Boolean := False;
912 -- GNATMAKE, GPRBUILD
913 -- Set to True to skip compile and bind steps (except when Bind_Only is
916 List_Body_Required_Info : Boolean := False;
918 -- List info messages about why a package requires a body. Modified by use
921 List_Inherited_Aspects : Boolean := False;
923 -- List inherited invariants, preconditions, and postconditions from
924 -- Invariant'Class, Pre'Class, and Post'Class aspects. Also list inherited
925 -- subtype predicates. Modified by use of -gnatw.l/.L.
927 List_Restrictions : Boolean := False;
929 -- Set to True to list restrictions pragmas that could apply to partition
931 List_Units : Boolean := False;
933 -- List units in the active library for a compilation (-gnatu switch)
935 List_Closure : Boolean := False;
937 -- List all sources in the closure of a main (-R or -Ra gnatbind switch)
939 List_Closure_All : Boolean := False;
941 -- List all sources in closure of main including run-time units (-Ra
944 List_Dependencies : Boolean := False;
946 -- When True gnatmake verifies that the objects are up to date and outputs
947 -- the list of object dependencies (-M switch). Output depends if -a switch
948 -- is used or not. This list can be used directly in a Makefile.
950 List_Representation_Info : Int range 0 .. 3 := 0;
952 -- Set non-zero by -gnatR switch to list representation information.
953 -- The settings are as follows:
955 -- 0 = no listing of representation information (default as above)
956 -- 1 = list rep info for user defined record and array types
957 -- 2 = list rep info for all user defined types and objects
958 -- 3 = like 2, but variable fields are decoded symbolically
960 List_Representation_Info_To_File : Boolean := False;
962 -- Set true by -gnatRs switch. Causes information from -gnatR/1/2/3/m to be
963 -- written to file.rep (where file is the name of the source file) instead
964 -- of stdout. For example, if file x.adb is compiled using -gnatR2s then
965 -- representation info is written to x.adb.ref.
967 List_Representation_Info_Mechanisms : Boolean := False;
969 -- Set true by -gnatRm switch. Causes information on mechanisms to be
970 -- included in the representation output information.
972 List_Preprocessing_Symbols : Boolean := False;
974 -- Set to True if symbols for preprocessing a source are to be listed
975 -- before preprocessing occurs. Set to True by switch -s of gnatprep or
976 -- -s in preprocessing data file for the compiler.
978 type Create_Repinfo_File_Proc is access procedure (Src : String);
979 type Write_Repinfo_Line_Proc is access procedure (Info : String);
980 type Close_Repinfo_File_Proc is access procedure;
981 -- Types used for procedure addresses below
983 Create_Repinfo_File_Access : Create_Repinfo_File_Proc := null;
984 Write_Repinfo_Line_Access : Write_Repinfo_Line_Proc := null;
985 Close_Repinfo_File_Access : Close_Repinfo_File_Proc := null;
987 -- These three locations are left null when operating in non-compiler (e.g.
988 -- ASIS mode), but when operating in compiler mode, they are set to point
989 -- to the three corresponding procedures in Osint-C. The reason for this
990 -- slightly strange interface is to stop Repinfo from dragging in Osint in
991 -- ASIS mode, which would include lots of unwanted units in the ASIS build.
993 type Create_List_File_Proc is access procedure (S : String);
994 type Write_List_Info_Proc is access procedure (S : String);
995 type Close_List_File_Proc is access procedure;
996 -- Types used for procedure addresses below
998 Create_List_File_Access : Create_List_File_Proc := null;
999 Write_List_Info_Access : Write_List_Info_Proc := null;
1000 Close_List_File_Access : Close_List_File_Proc := null;
1002 -- These three locations are left null when operating in non-compiler
1003 -- (e.g. from the binder), but when operating in compiler mode, they are
1004 -- set to point to the three corresponding procedures in Osint-C. The
1005 -- reason for this slightly strange interface is to prevent Repinfo
1006 -- from dragging in Osint-C in the binder, which would include unwanted
1007 -- units in the binder.
1009 Locking_Policy : Character := ' ';
1011 -- Set to ' ' for the default case (no locking policy specified). Reset to
1012 -- first character (uppercase) of locking policy name if a valid pragma
1013 -- Locking_Policy is encountered.
1015 Locking_Policy_Sloc : Source_Ptr := No_Location;
1017 -- Remember location of previous Locking_Policy pragma. This is used for
1018 -- inconsistency error messages. A value of System_Location is used if the
1019 -- policy is set in package System.
1021 Look_In_Primary_Dir : Boolean := True;
1022 -- GNAT, GNATBIND, GNATMAKE, GNATCLEAN
1023 -- Set to False if a -I- was present on the command line. When True we are
1024 -- allowed to look in the primary directory to locate other source or
1027 Make_Steps : Boolean := False;
1029 -- Set to True when either Compile_Only, Bind_Only or Link_Only is
1032 Main_Index : Int := 0;
1034 -- This is set to non-zero by gnatmake switch -eInnn to indicate that
1035 -- the main program is the nnn unit in a multi-unit source file.
1037 Mapping_File_Name : String_Ptr := null;
1039 -- File name of mapping between unit names, file names and path names.
1040 -- (given by switch -gnatem)
1042 Maximum_Messages : Int := 9999;
1044 -- Maximum default number of errors before compilation is terminated, or in
1045 -- the case of GNAT, maximum number of warnings before further warnings are
1046 -- suppressed. Can be overridden by -gnatm (GNAT) or -m (GNATBIND) switch.
1048 Maximum_File_Name_Length : Int;
1050 -- Maximum number of characters allowed in a file name, not counting the
1051 -- extension, as set by the appropriate switch. If no switch is given,
1052 -- then this value is initialized by Osint to the appropriate value.
1054 Maximum_Instantiations : Int := 8000;
1056 -- Maximum number of instantiations permitted (to stop runaway cases
1057 -- of nested instantiations). These situations probably only occur in
1058 -- specially concocted test cases. Can be modified by -gnateinn switch.
1060 Maximum_Processes : Positive := 1;
1061 -- GNATMAKE, GPRBUILD
1062 -- Maximum number of processes that should be spawned to carry out
1065 Minimal_Recompilation : Boolean := False;
1067 -- Set to True if minimal recompilation mode requested
1069 Minimize_Expression_With_Actions : Boolean := False;
1071 -- If True, minimize the use of N_Expression_With_Actions node.
1072 -- This can be used in particular on some back-ends where this node is
1073 -- difficult to support.
1075 Modify_Tree_For_C : Boolean := False;
1077 -- If this switch is set True (currently it is set only by -gnatd.V), then
1078 -- certain meaning-preserving transformations are applied to the tree to
1079 -- make it easier to interface with back ends that implement C semantics.
1080 -- There is a section in Sinfo which describes the transformations made.
1082 Multiple_Unit_Index : Int := 0;
1084 -- This is set non-zero if the current unit is being compiled in multiple
1085 -- unit per file mode, meaning that the current unit is selected from the
1086 -- sequence of units in the current source file, using the value stored
1087 -- in this variable (e.g. 2 = select second unit in file). A value of
1088 -- zero indicates that we are in normal (one unit per file) mode.
1090 No_Backup : Boolean := False;
1092 -- Do not create backup copies of project files. Set by switch --no-backup.
1094 No_Deletion : Boolean := False;
1096 -- Set by preprocessor switch -a. Do not eliminate any source text. Implies
1097 -- Undefined_Symbols_Are_False. Useful to perform a syntax check on all
1098 -- branches of #if constructs.
1100 No_Elab_Code_All_Pragma : Node_Id := Empty;
1101 -- Set to point to a No_Elaboration_Code_All pragma or aspect encountered
1102 -- in the spec of the extended main unit. Used to determine if we need to
1103 -- do special tests for violation of this aspect.
1105 No_Main_Subprogram : Boolean := False;
1106 -- GNATMAKE, GNATBIND
1107 -- Set to True if compilation/binding of a program without main
1108 -- subprogram requested.
1110 No_Run_Time_Mode : Boolean := False;
1112 -- This flag is set True if a No_Run_Time pragma is encountered. See spec
1113 -- of Rtsfind for a full description of handling of this pragma.
1115 No_Split_Units : Boolean := False;
1117 -- Set to True with switch --no-split-units. When True, unit sources, spec,
1118 -- body and subunits, must all be in the same project. This is checked
1119 -- after each compilation.
1121 No_Stdinc : Boolean := False;
1122 -- GNAT, GNATBIND, GNATMAKE, GNATFIND, GNATXREF
1123 -- Set to True if no default source search dirs added to search list.
1125 No_Stdlib : Boolean := False;
1126 -- GNATMAKE, GNATBIND, GNATFIND, GNATXREF
1127 -- Set to True if no default library search dirs added to search list.
1129 No_Strict_Aliasing : Boolean := False;
1131 -- Set True if pragma No_Strict_Aliasing with no parameters encountered.
1133 No_Tagged_Streams : Node_Id := Empty;
1135 -- If a pragma No_Tagged_Streams is active for the current scope, this
1136 -- points to the corresponding pragma.
1138 Normalize_Scalars : Boolean := False;
1140 -- Set True if a pragma Normalize_Scalars applies to the current unit.
1141 -- Note that Init_Or_Norm_Scalars is also set to True if this is True.
1143 Object_Directory_Present : Boolean := False;
1145 -- Set to True when an object directory is specified with option -D
1147 Object_Path_File_Name : String_Ptr := null;
1149 -- Path of the temporary file that contains a list of object directories
1150 -- passed by -gnateO=<obj_path_file>.
1152 One_Compilation_Per_Obj_Dir : Boolean := False;
1153 -- GNATMAKE, GPRBUILD
1154 -- Set to True with switch --single-compile-per-obj-dir. When True, there
1155 -- cannot be simultaneous compilations with the object files in the same
1156 -- object directory, if project files are used.
1158 type Operating_Mode_Type is (Check_Syntax, Check_Semantics, Generate_Code);
1159 pragma Ordered (Operating_Mode_Type);
1160 Operating_Mode : Operating_Mode_Type := Generate_Code;
1162 -- Indicates the operating mode of the compiler. The default is generate
1163 -- code, which runs the parser, semantics and backend. Switches can be
1164 -- used to set syntax checking only mode, or syntax and semantics checking
1165 -- only mode. Operating_Mode can also be modified as a result of detecting
1166 -- errors during the compilation process. In particular if any serious
1167 -- error is detected then this flag is reset from Generate_Code to
1168 -- Check_Semantics after generating an error message. This is an ordered
1169 -- type with the semantics that each value does more than the previous one.
1171 Optimize_Alignment : Character := 'O';
1172 -- Setting of Optimize_Alignment, set to T/S/O for time/space/off. Can
1173 -- be modified by use of pragma Optimize_Alignment.
1175 Optimize_Alignment_Local : Boolean := False;
1176 -- Set True if Optimize_Alignment mode is set by a local configuration
1177 -- pragma that overrides the gnat.adc (or other configuration file) default
1178 -- so that the unit is not dependent on the default setting. Also always
1179 -- set True for internal units, since these always have a default setting
1180 -- of Optimize_Alignment (Off) that is enforced (essentially equivalent to
1181 -- them all having such an explicit pragma in each unit).
1183 Original_Operating_Mode : Operating_Mode_Type := Generate_Code;
1185 -- Indicates the original operating mode of the compiler as set by compiler
1186 -- options. This is identical to Operating_Mode except that this is not
1187 -- affected by errors.
1189 Optimization_Level : Int;
1190 pragma Import (C, Optimization_Level, "optimize");
1191 -- Constant reflecting the optimization level (0,1,2,3 for -O0,-O1,-O2,-O3)
1192 -- See e.g. aamissing.c for definitions for the GNAAMP back end.
1194 Optimize_Size : Int;
1195 pragma Import (C, Optimize_Size, "optimize_size");
1196 -- Constant reflecting setting of -Os (optimize for size). Set to nonzero
1197 -- in -Os mode and set to zero otherwise. See aamissing.c for definition
1198 -- of "optimize_size" for the GNAAMP backend.
1200 Output_File_Name_Present : Boolean := False;
1201 -- GNATBIND, GNAT, GNATMAKE
1202 -- Set to True when the output C file name is given with option -o for
1203 -- GNATBIND, when the object file name is given with option -gnatO for GNAT
1204 -- or when the executable is given with option -o for GNATMAKE.
1206 Output_Linker_Option_List : Boolean := False;
1208 -- True if output of list of linker options is requested (-K switch set)
1210 Output_ALI_List : Boolean := False;
1211 ALI_List_Filename : String_Ptr;
1213 -- True if output of list of ALIs is requested (-A switch set). List is
1214 -- output under the given filename, or standard output if not specified.
1216 Output_Object_List : Boolean := False;
1217 Object_List_Filename : String_Ptr;
1219 -- True if output of list of objects is requested (-O switch set). List is
1220 -- output under the given filename, or standard output if not specified.
1222 Partition_Elaboration_Policy : Character := ' ';
1224 -- Set to ' ' for the default case (no elaboration policy specified). Reset
1225 -- to first character (uppercase) of locking policy name if a valid pragma
1226 -- Partition_Elaboration_Policy is encountered.
1228 Partition_Elaboration_Policy_Sloc : Source_Ptr := No_Location;
1230 -- Remember location of previous Partition_Elaboration_Policy pragma. This
1231 -- is used for inconsistency error messages. A value of System_Location is
1232 -- used if the policy is set in package System.
1234 Persistent_BSS_Mode : Boolean := False;
1236 -- True if a Persistent_BSS configuration pragma is in effect, causing
1237 -- potentially persistent data to be placed in the persistent_bss section.
1239 Pessimistic_Elab_Order : Boolean := False;
1241 -- True if pessimistic elaboration order is to be chosen (-p switch set)
1243 Polling_Required : Boolean := False;
1245 -- Set to True if polling for asynchronous abort is enabled by using
1246 -- the -gnatP option for GNAT.
1248 Prefix_Exception_Messages : Boolean := False;
1250 -- Set True to prefix exception messages with entity-name:
1252 Preprocessing_Data_File : String_Ptr := null;
1254 -- Set by switch -gnatep=. The file name of the preprocessing data file.
1256 Preprocessing_Symbol_Defs : String_List_Access := new String_List (1 .. 4);
1257 -- An extensible array to temporarily stores symbol definitions specified
1258 -- on the command line with -gnateD switches. The value 4 is an arbitrary
1259 -- starting point, if more space is needed it is allocated as required.
1261 Preprocessing_Symbol_Last : Natural := 0;
1262 -- Index of last symbol definition in array Symbol_Definitions
1264 Print_Generated_Code : Boolean := False;
1266 -- Set to True to enable output of generated code in source form. This
1267 -- flag is set by the -gnatG switch.
1269 Print_Standard : Boolean := False;
1271 -- Set to true to enable printing of package standard in source form.
1272 -- This flag is set by the -gnatS switch
1274 type Usage is (Unknown, Not_In_Use, In_Use);
1275 Project_File_In_Use : Usage := Unknown;
1277 -- Indicates if a project file is used or not. Set to In_Use by the first
1280 Queuing_Policy : Character := ' ';
1282 -- Set to ' ' for the default case (no queuing policy specified). Reset to
1283 -- first character (uppercase) of locking policy name if a valid
1284 -- Queuing_Policy pragma is encountered.
1286 Queuing_Policy_Sloc : Source_Ptr := No_Location;
1288 -- Remember location of previous Queuing_Policy pragma. This is used for
1289 -- inconsistency error messages. A value of System_Location is used if the
1290 -- policy is set in package System.
1292 Quiet_Output : Boolean := False;
1293 -- GNATMAKE, GNATCLEAN, GPRBUILD, GPRCLEAN
1294 -- Set to True if the tool should not have any output if there are no
1295 -- errors or warnings.
1297 Overriding_Renamings : Boolean := False;
1299 -- Set to True to enable compatibility mode with Rational compiler, and
1300 -- to accept renamings of implicit operations in their own scope.
1302 Relaxed_RM_Semantics : Boolean := False;
1304 -- Set to True to ignore some Ada semantic error to help parse legacy Ada
1305 -- code for use in e.g. static analysis (such as CodePeer). This deals
1306 -- with cases where other compilers allow illegal constructs. Tools such as
1307 -- CodePeer are interested in analyzing code rather than enforcing legality
1308 -- rules, so as long as these illegal constructs end up with code that can
1309 -- be handled by the tool in question, there is no reason to reject the
1310 -- code that is considered correct by the other compiler.
1312 Replace_In_Comments : Boolean := False;
1314 -- Set to True if -C switch used.
1316 RTS_Lib_Path_Name : String_Ptr := null;
1317 RTS_Src_Path_Name : String_Ptr := null;
1319 -- Set to the "adalib" and "adainclude" directories of the run time
1320 -- specified by --RTS=.
1322 RTS_Switch : Boolean := False;
1323 -- GNAT, GNATMAKE, GNATBIND, GNATLS, GNATFIND, GNATXREF
1324 -- Set to True when the --RTS switch is set
1326 Run_Path_Option : Boolean := True;
1327 -- GNATMAKE, GNATLINK
1328 -- Set to False when no run_path_option should be issued to the linker
1330 Search_Directory_Present : Boolean := False;
1332 -- Set to True when argument is -I. Reset to False when next argument, a
1333 -- search directory path is taken into account. Note that this is quite
1334 -- different from other switches in this section in that it is only set in
1335 -- a transitory manner as a result of scanning a -I switch with no file
1336 -- name, and if set, is an indication that the next argument is to be
1337 -- treated as a file name.
1339 Sec_Stack_Used : Boolean := False;
1341 -- Set True if generated code uses the System.Secondary_Stack package. For
1342 -- the binder, set if any unit uses the secondary stack package.
1344 Setup_Projects : Boolean := False;
1346 -- Set to True for GNAT SETUP: the Project Manager creates nonexistent
1347 -- object, library, and exec directories.
1349 Shared_Libgnat : Boolean;
1351 -- Set to True if a shared libgnat is requested by using the -shared option
1352 -- for GNATBIND and to False when using the -static option. The value of
1353 -- this flag is set by Gnatbind.Scan_Bind_Arg.
1355 Short_Circuit_And_Or : Boolean := False;
1357 -- Set True if a pragma Short_Circuit_And_Or applies to the current unit.
1359 type SPARK_Mode_Type is (None, Off, On);
1360 -- Possible legal modes that can be set by aspect/pragma SPARK_Mode, as
1361 -- well as the value None, which indicates no such pragma/aspect applies.
1363 SPARK_Mode : SPARK_Mode_Type := None;
1365 -- Current SPARK mode setting.
1367 SPARK_Mode_Pragma : Node_Id := Empty;
1369 -- If the current SPARK_Mode (above) was set by a pragma, this records
1370 -- the pragma that set this mode.
1372 SPARK_Switches_File_Name : String_Ptr := null;
1374 -- Set to non-null file name by use of the -gnates switch to specify
1375 -- SPARK (gnat2why) specific switches in the given file name.
1377 Special_Exception_Package_Used : Boolean := False;
1379 -- Set to True if either of the unit GNAT.Most_Recent_Exception or
1380 -- GNAT.Exception_Traces is with'ed. Used to inhibit transformation of
1381 -- local raise statements into gotos in the presence of either package.
1383 Sprint_Line_Limit : Nat := 72;
1385 -- Limit values for chopping long lines in Cprint/Sprint output, can be
1386 -- reset by use of NNN parameter with -gnatG or -gnatD switches.
1388 Stack_Checking_Enabled : Boolean := False;
1390 -- Set to indicate if stack checking is enabled for the compilation. This
1391 -- is set directly from the value in the gcc back end in the body of the
1392 -- gcc version of back_end.adb.
1394 Style_Check : Boolean := False;
1396 -- Set True to perform style checks. Activates checks carried out in
1397 -- package Style (see body of this package for details of checks). This
1398 -- flag is set True by use of either the -gnatg or -gnaty switches, or
1399 -- by the Style_Check pragma.
1401 Style_Check_Main : Boolean := False;
1403 -- Set True if Style_Check was set for the main unit. This is used to
1404 -- enable style checks for units in the main extended source that get
1405 -- with'ed indirectly. It is set True by use of either the -gnatg or
1406 -- -gnaty switches, but not by use of the Style_Checks pragma.
1408 Disable_FE_Inline : Boolean := False;
1409 Disable_FE_Inline_Always : Boolean := False;
1411 -- Request to disable front end inlining from pragma Inline or pragma
1412 -- Inline_Always out of the presence of the -fno-inline back end flag
1413 -- on the command line, regardless of any other switches that are set.
1414 -- It remains the back end's reponsibility to honor -fno-inline at the
1417 Suppress_Control_Flow_Optimizations : Boolean := False;
1419 -- Set by -fpreserve-control-flow. Suppresses control flow optimizations
1420 -- that interfere with coverage analysis based on the object code.
1422 System_Extend_Pragma_Arg : Node_Id := Empty;
1424 -- Set non-empty if and only if a correct Extend_System pragma was present
1425 -- in which case it points to the argument of the pragma, and the name can
1426 -- be located as Chars (Expression (System_Extend_Pragma_Arg)).
1428 System_Extend_Unit : Node_Id := Empty;
1430 -- This is set to Empty if GNAT_Mode is set, since pragma Extend_System
1431 -- is never appropriate in GNAT_Mode (and causes troubles, including
1432 -- bogus circularities, if we try to compile the run-time library with
1433 -- a System extension). If GNAT_Mode is not set, then System_Extend_Unit
1434 -- is a copy of the value set in System_Extend_Pragma_Arg.
1436 Subunits_Missing : Boolean := False;
1438 -- This flag is set true if missing subunits are detected with code
1439 -- generation active. This causes code generation to be skipped.
1441 Suppress_Checks : Boolean := False;
1443 -- Set to True if -gnatp (suppress all checks) switch present.
1445 Suppress_Options : Suppress_Record;
1447 -- Indicates outer level setting of check suppression. This initializes
1448 -- the settings of the outer scope level in any unit compiled. This is
1449 -- initialized by Osint.Initialize, and further initialized by the
1450 -- Adjust_Global_Switches flag in Gnat1drv.
1452 Table_Factor : Int := 1;
1454 -- Factor by which all initial table sizes set in Alloc are multiplied.
1455 -- Used in Table to calculate initial table sizes (the initial table size
1456 -- is the value in Alloc, used as the Table_Initial parameter value,
1457 -- multiplied by the factor given here. The default value is used if no
1458 -- -gnatT switch appears.
1460 Tagged_Type_Expansion : Boolean := True;
1462 -- Set True if tagged types and interfaces should be expanded by the
1463 -- front-end. If False, the original tree is left unexpanded for tagged
1464 -- types and dispatching calls, assuming the underlying target supports it.
1466 Target_Dependent_Info_Read_Name : String_Ptr := null;
1468 -- Set non-null to override the normal processing in Get_Targ and set the
1469 -- necessary information by reading the target dependent information file
1470 -- whose name is given here (see packages Get_Targ and Set_Targ for full
1471 -- details). Set to non-null file name by use of the -gnateT switch.
1473 Target_Dependent_Info_Write_Name : String_Ptr := null;
1475 -- Set non-null to enable a call to Set_Targ.Write_Target_Dependent_Info
1476 -- which writes a target independent information file (see packages
1477 -- Get_Targ and Set_Targ for full details) using the name given by
1478 -- this switch. Set to non-null file name by use of the -gnatet switch.
1480 type Origin_Of_Target is (Unknown, Default, Specified);
1482 Target_Origin : Origin_Of_Target := Unknown;
1484 -- Indicates the origin of attribute Target in project files
1486 Target_Value : String_Access := null;
1488 -- Indicates the value of attribute Target in project files
1490 Task_Dispatching_Policy : Character := ' ';
1492 -- Set to ' ' for the default case (no task dispatching policy specified).
1493 -- Reset to first character (uppercase) of task dispatching policy name
1494 -- if a valid Task_Dispatching_Policy pragma is encountered.
1496 Task_Dispatching_Policy_Sloc : Source_Ptr := No_Location;
1498 -- Remember location of previous Task_Dispatching_Policy pragma. This is
1499 -- used for inconsistency error messages. A value of System_Location is
1500 -- used if the policy is set in package System.
1502 Tasking_Used : Boolean := False;
1503 -- Set True if any tasking construct is encountered. Used to activate the
1504 -- output of the Q, L and T lines in ALI files.
1506 Time_Slice_Set : Boolean := False;
1508 -- Set True if a pragma Time_Slice is processed in the main unit, or
1509 -- if the -gnatTnn switch is present to set a time slice value.
1511 Time_Slice_Value : Nat;
1513 -- Time slice value. Valid only if Time_Slice_Set is True, i.e. if
1514 -- Time_Slice pragma has been processed. Set to the time slice value in
1515 -- microseconds. Negative values are stored as zero, and the value is not
1516 -- larger than 1_000_000_000 (1000 seconds). Values larger than this are
1517 -- reset to this maximum. This can also be set with the -gnatTnn switch.
1519 Tolerate_Consistency_Errors : Boolean := False;
1521 -- Tolerate time stamp and other consistency errors. If this flag is set to
1522 -- True (-t), then inconsistencies result in warnings rather than errors.
1524 Treat_Categorization_Errors_As_Warnings : Boolean := False;
1525 -- Normally categorization errors are true illegalities. If this switch
1526 -- is set, then such errors result in warning messages rather than error
1527 -- messages. Set True by -gnateP (P for Pure/Preelaborate). Also set in
1528 -- Relaxed_RM_Semantics mode since some old Ada 83 compilers treated
1529 -- pragma Preelaborate differently.
1531 Treat_Restrictions_As_Warnings : Boolean := False;
1533 -- Set True to treat pragma Restrictions as Restriction_Warnings. Set by
1536 Tree_Output : Boolean := False;
1538 -- Set to True (-gnatt) to generate output tree file
1540 Try_Semantics : Boolean := False;
1542 -- Flag set to force attempt at semantic analysis, even if parser errors
1543 -- occur. This will probably cause blowups at this stage in the game. On
1544 -- the other hand, most such blowups will be caught cleanly and simply
1545 -- say compilation abandoned. This flag is set True by -gnatq or -gnatQ.
1547 Unchecked_Shared_Lib_Imports : Boolean := False;
1549 -- Set to True when shared library projects are allowed to import projects
1550 -- that are not shared library projects. Set on by use of the switch
1551 -- --unchecked-shared-lib-imports.
1553 Undefined_Symbols_Are_False : Boolean := False;
1555 -- Set to True by switch -u of gnatprep or -u in the preprocessing data
1556 -- file for the compiler. Indicates that while preprocessing sources,
1557 -- symbols that are not defined have the value FALSE.
1559 Uneval_Old : Character := 'E';
1561 -- Set to 'E'/'W'/'A' for use of Error/Warn/Allow in a valid pragma
1562 -- Unevaluated_Use_Of_Old. Default in the absence of the pragma is 'E'
1563 -- for the RM default behavior of giving an error.
1565 Unique_Error_Tag : Boolean := Tag_Errors;
1567 -- Indicates if error messages are to be prefixed by the string error:
1568 -- Initialized from Tag_Errors, can be forced on with the -gnatU switch.
1570 Unnest_Subprogram_Mode : Boolean := False;
1571 -- If true, activates the circuitry for unnesting subprograms (see the spec
1572 -- of Exp_Unst for full details). Currently set only by use of -gnatd.1.
1574 Universal_Addressing_On_AAMP : Boolean := False;
1576 -- Indicates if library-level objects should be accessed and updated using
1577 -- universal addressing instructions on the AAMP architecture. This flag is
1578 -- set to True when pragma Universal_Data is given as a configuration
1581 Unreserve_All_Interrupts : Boolean := False;
1583 -- Normally set False, set True if a valid Unreserve_All_Interrupts pragma
1584 -- appears anywhere in the main unit for GNAT, or if any ALI file has the
1585 -- corresponding attribute set in GNATBIND.
1587 Upper_Half_Encoding : Boolean := False;
1589 -- Normally set False, indicating that upper half ISO 8859-1 characters are
1590 -- used in the normal way to represent themselves. If the wide character
1591 -- encoding method uses the upper bit for this encoding, then this flag is
1592 -- set True, and upper half characters in the source indicate the start of
1593 -- a wide character sequence. Set by -gnatW or -W switches.
1595 Use_Include_Path_File : Boolean := False;
1596 -- GNATMAKE, GPRBUILD
1597 -- When True, create a source search path file, even when a mapping file
1600 Usage_Requested : Boolean := False;
1601 -- GNAT, GNATBIND, GNATMAKE
1602 -- Set to True if -h (-gnath for the compiler) switch encountered
1603 -- requesting usage information
1605 Use_Pragma_Linker_Constructor : Boolean := False;
1607 -- True if pragma Linker_Constructor applies to adainit
1609 Use_VADS_Size : Boolean := False;
1611 -- Set to True if a valid pragma Use_VADS_Size is processed
1613 Validity_Checks_On : Boolean := True;
1615 -- This flag determines if validity checking is on or off. The initial
1616 -- state is on, and the required default validity checks are active. The
1617 -- actual set of checks that is performed if Validity_Checks_On is set is
1618 -- defined by the switches in package Validsw. The Validity_Checks_On flag
1619 -- is controlled by pragma Validity_Checks (On | Off), and also some
1620 -- generated compiler code (typically code that has to do with validity
1621 -- check generation) is compiled with this flag set to False. This flag is
1622 -- set to False by the -gnatp switch.
1624 Verbose_Mode : Boolean := False;
1625 -- GNAT, GNATBIND, GNATMAKE, GNATLINK, GNATLS, GNATNAME, GNATCLEAN,
1626 -- GPRBUILD, GPRCLEAN
1627 -- Set to True to get verbose mode (full error message text and location
1628 -- information sent to standard output, also header, copyright and summary)
1630 type Verbosity_Level_Type is (None, Low, Medium, High);
1631 pragma Ordered (Verbosity_Level_Type);
1632 Verbosity_Level : Verbosity_Level_Type := High;
1634 -- Modified by gnatmake switches -v, -vl, -vm, -vh. Indicates
1635 -- the level of verbosity of informational messages:
1637 -- In Low Verbosity, the reasons why a source is recompiled, the name
1638 -- of the executable and the reason it must be rebuilt is output.
1640 -- In Medium Verbosity, additional lines are output for each ALI file
1643 -- In High Verbosity, additional lines are output when the ALI file
1644 -- is part of an Ada library, is read-only or is part of the runtime.
1646 Warn_On_Ada_2005_Compatibility : Boolean := True;
1648 -- Set to True to generate all warnings on Ada 2005 compatibility issues,
1649 -- including warnings on Ada 2005 obsolescent features used in Ada 2005
1650 -- mode. Set by default, modified by use of -gnatwy/Y.
1652 Warn_On_Ada_2012_Compatibility : Boolean := True;
1654 -- Set to True to generate all warnings on Ada 2012 compatibility issues,
1655 -- including warnings on Ada 2012 obsolescent features used in Ada 2012
1656 -- mode. Modified by use of -gnatwy/Y.
1658 Warn_On_All_Unread_Out_Parameters : Boolean := False;
1660 -- Set to True to generate warnings in all cases where a variable is
1661 -- modified by being passed as to an OUT formal, but the resulting value is
1662 -- never read. The default is that this warning is suppressed. Modified
1663 -- by use of gnatw.o/.O.
1665 Warn_On_Assertion_Failure : Boolean := True;
1667 -- Set to True to activate warnings on assertions that can be determined
1668 -- at compile time will always fail. Modified by use of -gnatw.a/.A.
1670 Warn_On_Assumed_Low_Bound : Boolean := True;
1672 -- Set to True to activate warnings for string parameters that are indexed
1673 -- with literals or S'Length, presumably assuming a lower bound of one.
1674 -- Modified by use of -gnatww/W.
1676 Warn_On_Atomic_Synchronization : Boolean := False;
1678 -- Set to True to generate information messages for atomic synchronization.
1679 -- Modified by use of -gnatw.n/.N.
1681 Warn_On_Bad_Fixed_Value : Boolean := False;
1683 -- Set to True to generate warnings for static fixed-point expression
1684 -- values that are not an exact multiple of the small value of the type.
1685 -- Odd by default, modified by use of -gnatwb/B.
1687 Warn_On_Biased_Representation : Boolean := True;
1689 -- Set to True to generate warnings for size clauses, component clauses
1690 -- and component_size clauses that force biased representation. Modified
1691 -- by use of -gnatw.b/.B.
1693 Warn_On_Constant : Boolean := False;
1695 -- Set to True to generate warnings for variables that could be declared
1696 -- as constants. Modified by use of -gnatwk/K.
1698 Warn_On_Deleted_Code : Boolean := False;
1700 -- Set to True to generate warnings for code deleted by the front end
1701 -- for conditional statements whose outcome is known at compile time.
1702 -- Modified by use of -gnatwt/T.
1704 Warn_On_Dereference : Boolean := False;
1706 -- Set to True to generate warnings for implicit dereferences for array
1707 -- indexing and record component access. Modified by use of -gnatwd/D.
1709 Warn_On_Export_Import : Boolean := True;
1711 -- Set to True to generate warnings for suspicious use of export or
1712 -- import pragmas. Modified by use of -gnatwx/X.
1714 Warn_On_Elab_Access : Boolean := False;
1716 -- Set to True to generate warnings for P'Access in the case where
1717 -- subprogram P is in the same package as the P'Access, and the P'Access is
1718 -- evaluated at package elaboration time, and occurs before the body of P
1719 -- has been elaborated.
1721 Warn_On_Hiding : Boolean := False;
1723 -- Set to True to generate warnings if a declared entity hides another
1724 -- entity. The default is that this warning is suppressed. Modified by
1725 -- use of -gnatwh/H.
1727 Warn_On_Modified_Unread : Boolean := False;
1729 -- Set to True to generate warnings if a variable is assigned but is never
1730 -- read. Also controls warnings for similar cases involving out parameters,
1731 -- but only if there is only one out parameter for the procedure involved.
1732 -- The default is that this warning is suppressed, modified by use of
1735 Warn_On_No_Value_Assigned : Boolean := True;
1737 -- Set to True to generate warnings if no value is ever assigned to a
1738 -- variable that is at least partially uninitialized. Set to false to
1739 -- suppress such warnings. The default is that such warnings are enabled.
1740 -- Modified by use of -gnatwv/V.
1742 Warn_On_Non_Local_Exception : Boolean := False;
1744 -- Set to True to generate warnings for non-local exception raises and also
1745 -- handlers that can never handle a local raise. This warning is only ever
1746 -- generated if pragma Restrictions (No_Exception_Propagation) is set. The
1747 -- default is not to generate the warnings except that if the source has
1748 -- at least one exception handler, and this restriction is set, and the
1749 -- warning was not explicitly turned off, then it is turned on by default.
1750 -- Modified by use of -gnatw.x/.X.
1752 No_Warn_On_Non_Local_Exception : Boolean := False;
1754 -- This is set to True if the above warning is explicitly suppressed. We
1755 -- use this to avoid turning it on by default when No_Exception_Propagation
1756 -- restriction is set and an exception handler is present.
1758 Warn_On_Object_Renames_Function : Boolean := False;
1760 -- Set to True to generate warnings when a function result is renamed as
1761 -- an object. The default is that this warning is disabled. Modified by
1762 -- use of -gnatw.r/.R.
1764 Warn_On_Obsolescent_Feature : Boolean := False;
1766 -- Set to True to generate warnings on use of any feature in Annex or if a
1767 -- subprogram is called for which a pragma Obsolescent applies. Modified
1768 -- by use of -gnatwj/J.
1770 Warn_On_Overlap : Boolean := False;
1772 -- Set to True to generate warnings when a writable actual overlaps with
1773 -- another actual in a subprogram call. This applies only in modes before
1774 -- Ada 2012. Starting with Ada 2012, such overlaps are illegal.
1775 -- Modified by use of -gnatw.i/.I.
1777 Warn_On_Questionable_Missing_Parens : Boolean := True;
1779 -- Set to True to generate warnings for cases where parentheses are missing
1780 -- and the usage is questionable, because the intent is unclear. On by
1781 -- default, modified by use of -gnatwq/Q.
1783 Warn_On_Parameter_Order : Boolean := False;
1785 -- Set to True to generate warnings for cases where the argument list for
1786 -- a call is a sequence of identifiers that match the formal identifiers,
1787 -- but are in the wrong order.
1789 Warn_On_Redundant_Constructs : Boolean := False;
1791 -- Set to True to generate warnings for redundant constructs (e.g. useless
1792 -- assignments/conversions). The default is that this warning is disabled.
1793 -- Modified by use of -gnatwr/R.
1795 Warn_On_Reverse_Bit_Order : Boolean := True;
1797 -- Set to True to generate warning (informational) messages for component
1798 -- clauses that are affected by non-standard bit-order. The default is
1799 -- that this warning is enabled. Modified by -gnatw.v/.V.
1801 Warn_On_Suspicious_Contract : Boolean := True;
1803 -- Set to True to generate warnings for suspicious contracts expressed as
1804 -- pragmas or aspects precondition and postcondition, as well as other
1805 -- suspicious cases of expressions typically found in contracts like
1806 -- quantified expressions and uses of Update attribute. The default is that
1807 -- this warning is enabled. Modified by use of -gnatw.t/.T.
1809 Warn_On_Suspicious_Modulus_Value : Boolean := True;
1811 -- Set to True to generate warnings for suspicious modulus values. The
1812 -- default is that this warning is enabled. Modified by -gnatw.m/.M.
1814 Warn_On_Unchecked_Conversion : Boolean := True;
1816 -- Set to True to generate warnings for unchecked conversions that may have
1817 -- non-portable semantics (e.g. because sizes of types differ). Modified
1818 -- by use of -gnatwz/Z.
1820 Warn_On_Unordered_Enumeration_Type : Boolean := False;
1822 -- Set to True to generate warnings for inappropriate uses (comparisons
1823 -- and explicit ranges) on unordered enumeration types (which includes
1824 -- all enumeration types for which pragma Ordered is not given). The
1825 -- default is that this warning is disabled. Modified by -gnat.u/.U.
1827 Warn_On_Unrecognized_Pragma : Boolean := True;
1829 -- Set to True to generate warnings for unrecognized pragmas. The default
1830 -- is that this warning is enabled. Modified by use of -gnatwg/G.
1832 Warn_On_Unrepped_Components : Boolean := False;
1834 -- Set to True to generate warnings for the case of components of record
1835 -- which have a record representation clause but this component does not
1836 -- have a component clause. Modified by use of -gnatw.c/.C.
1838 Warn_On_Warnings_Off : Boolean := False;
1840 -- Set to True to generate warnings for use of Pragma Warnings (Off, ent),
1841 -- where either the pragma is never used, or it could be replaced by a
1842 -- pragma Unmodified or Unreferenced. Also generates warnings for pragma
1843 -- Warning (Off, string) which either has no matching pragma Warning On,
1844 -- or where no warning has been suppressed by the use of the pragma.
1845 -- Modified by use of -gnatw.w/.W.
1847 type Warning_Mode_Type is (Suppress, Normal, Treat_As_Error);
1848 Warning_Mode : Warning_Mode_Type := Normal;
1850 -- Controls treatment of warning messages. If set to Suppress, warning
1851 -- messages are not generated at all. In Normal mode, they are generated
1852 -- but do not count as errors. In Treat_As_Error mode, warning messages are
1853 -- generated and are treated as errors. Note that Warning_Mode = Suppress
1854 -- causes pragma Warnings to be ignored (except for legality checks),
1855 -- unless we are in GNATprove_Mode, which requires pragma Warnings to
1856 -- be stored for the formal verification backend.
1858 Warnings_As_Errors_Count : Natural;
1860 -- Number of entries stored in Warnings_As_Errors table
1862 Wide_Character_Encoding_Method : WC_Encoding_Method := WCEM_Brackets;
1864 -- Method used for encoding wide characters in the source program. See
1865 -- description of type in unit System.WCh_Con for a list of the methods
1866 -- that are currently supported. Note that brackets notation is always
1867 -- recognized in source programs regardless of the setting of this
1868 -- variable. The default setting causes only the brackets notation to be
1869 -- recognized. If this is the main unit, this setting also controls the
1870 -- output of the W=? parameter in the ALI file, which is used to provide
1871 -- the default for encoding [Wide_[Wide_]]Text_IO files. For the binder,
1872 -- the value set here overrides this main unit default.
1874 Wide_Character_Encoding_Method_Specified : Boolean := False;
1876 -- Set True if the value in Wide_Character_Encoding_Method was set as
1877 -- a result of an explicit -gnatW? or -W? switch. False otherwise.
1879 Xref_Active : Boolean := True;
1881 -- Set if cross-referencing is enabled (i.e. xref info in ALI files)
1883 Zero_Formatting : Boolean := False;
1885 -- Do no formatting (no title, no leading spaces, no empty lines) in
1886 -- auxiliary outputs (-e, -K, -l, -R).
1888 ----------------------------
1889 -- Configuration Settings --
1890 ----------------------------
1892 -- These are settings that are used to establish the mode at the start of
1893 -- each unit. The values defined below can be affected either by command
1894 -- line switches, or by the use of appropriate configuration pragmas in a
1895 -- configuration pragma file (but NOT by a local use of a configuration
1896 -- pragma in a single file).
1898 Ada_Version_Config : Ada_Version_Type;
1900 -- This is the value of the configuration switch for the Ada 83 mode, as
1901 -- set by the command line switches -gnat83/95/2005/2012, and possibly
1902 -- modified by the use of configuration pragmas Ada_*. This switch is used
1903 -- to set the initial value for Ada_Version mode at the start of analysis
1904 -- of a unit. Note however that the setting of this flag is ignored for
1905 -- internal and predefined units (which are always compiled in the most up
1906 -- to date version of Ada).
1908 Ada_Version_Pragma_Config : Node_Id;
1909 -- This will be set nonempty if it is set by a configuration pragma
1911 Ada_Version_Explicit_Config : Ada_Version_Type;
1913 -- This is set in the same manner as Ada_Version_Config. The difference is
1914 -- that the setting of this flag is not ignored for internal and predefined
1915 -- units, which for some purposes do indeed access this value, regardless
1916 -- of the fact that they are compiled the most up to date ada version).
1918 Assertions_Enabled_Config : Boolean;
1920 -- This is the value of the configuration switch for assertions enabled
1921 -- mode, as possibly set by the command line switch -gnata, and possibly
1922 -- modified by the use of the configuration pragma Assertion_Policy.
1924 Assume_No_Invalid_Values_Config : Boolean;
1926 -- This is the value of the configuration switch for assuming "no invalid
1927 -- values enabled" mode, as possibly set by the command line switch
1928 -- -gnatB, and possibly modified by the use of the configuration pragma
1929 -- Assume_No_Invalid_Values.
1931 Check_Float_Overflow_Config : Boolean;
1933 -- Set to True to check that operations on predefined unconstrained float
1934 -- types (e.g. Float, Long_Float) do not overflow and generate infinities
1935 -- or invalid values. Set by the Check_Float_Overflow pragma, or by use
1936 -- of the -gnateF switch.
1938 Check_Policy_List_Config : Node_Id;
1940 -- This points to the list of N_Pragma nodes for Check_Policy pragmas
1941 -- that are linked through the Next_Pragma fields, with the list being
1942 -- terminated by Empty. The order is most recently processed first. This
1943 -- list includes only those pragmas in configuration pragma files.
1945 Default_Pool_Config : Node_Id := Empty;
1947 -- Same as Default_Pool above, except this is only for Default_Storage_Pool
1948 -- pragmas that are configuration pragmas.
1950 Default_SSO_Config : Character := ' ';
1952 -- Set if a pragma Default_Scalar_Storage_Order appears as a configuration
1953 -- pragma. A value of ' ' means that no pragma was given, otherwise the
1954 -- value is 'H' for High_Order_First or 'L' for Low_Order_First.
1956 Dynamic_Elaboration_Checks_Config : Boolean := False;
1958 -- Set True for dynamic elaboration checking mode, as set by the -gnatE
1959 -- switch or by the use of pragma Elaboration_Checking (Dynamic).
1961 Exception_Locations_Suppressed_Config : Boolean := False;
1963 -- Set True by use of the configuration pragma Suppress_Exception_Messages
1965 Extensions_Allowed_Config : Boolean;
1967 -- This is the flag that indicates whether extensions are allowed. It can
1968 -- be set True either by use of the -gnatX switch, or by use of the
1969 -- configuration pragma Extensions_Allowed (On). It is always set to True
1970 -- for internal GNAT units, since extensions are always permitted in such
1973 External_Name_Exp_Casing_Config : External_Casing_Type;
1975 -- This is the value of the configuration switch that controls casing of
1976 -- external symbols for which an explicit external name is given. It can be
1977 -- set to Uppercase by the command line switch -gnatF, and further modified
1978 -- by the use of the configuration pragma External_Name_Casing in the
1979 -- gnat.adc file. This flag is used to set the initial value for
1980 -- External_Name_Exp_Casing at the start of analyzing each unit. Note
1981 -- however that the setting of this flag is ignored for internal and
1982 -- predefined units (which are always compiled with As_Is mode).
1984 External_Name_Imp_Casing_Config : External_Casing_Type;
1986 -- This is the value of the configuration switch that controls casing of
1987 -- external symbols where the external name is implicitly given. It can be
1988 -- set to Uppercase by the command line switch -gnatF, and further modified
1989 -- by the use of the configuration pragma External_Name_Casing in the
1990 -- gnat.adc file. This flag is used to set the initial value for
1991 -- External_Name_Imp_Casing at the start of analyzing each unit. Note
1992 -- however that the setting of this flag is ignored for internal and
1993 -- predefined units (which are always compiled with Lowercase mode).
1995 Fast_Math_Config : Boolean;
1997 -- This is the value of the configuration switch that controls Fast_Math
1998 -- mode, as set by a Fast_Math pragma in configuration pragmas. It is
1999 -- used to set the initial value of Fast_Math at the start of each new
2000 -- compilation unit.
2002 Initialize_Scalars_Config : Boolean;
2004 -- This is the value of the configuration switch that is set by the
2005 -- pragma Initialize_Scalars when it appears in the gnat.adc file.
2006 -- This switch is not set when the pragma appears ahead of a given
2007 -- unit, so it does not affect the compilation of other units.
2009 No_Exit_Message : Boolean := False;
2010 -- GNATMAKE, GPRBUILD
2011 -- Set with switch --no-exit-message. When True, if there are compilation
2012 -- failures, the builder does not issue an exit error message.
2014 Optimize_Alignment_Config : Character;
2016 -- This is the value of the configuration switch that controls the
2017 -- alignment optimization mode, as set by an Optimize_Alignment pragma.
2018 -- It is used to set the initial value of Optimize_Alignment at the start
2019 -- of each new compilation unit, except that it is always set to 'O' (off)
2020 -- for internal units.
2022 Persistent_BSS_Mode_Config : Boolean;
2024 -- This is the value of the configuration switch that controls whether
2025 -- potentially persistent data is to be placed in the persistent_bss
2026 -- section. It can be set True by use of the pragma Persistent_BSS.
2027 -- This flag is used to set the initial value of Persistent_BSS_Mode
2028 -- at the start of each compilation unit, except that it is always
2029 -- set False for predefined units.
2031 Polling_Required_Config : Boolean;
2033 -- This is the value of the configuration switch that controls polling
2034 -- mode. It can be set True by the command line switch -gnatP, and then
2035 -- further modified by the use of pragma Polling in the gnat.adc file. This
2036 -- flag is used to set the initial value for Polling_Required at the start
2037 -- of analyzing each unit.
2039 Prefix_Exception_Messages_Config : Boolean;
2040 -- The setting of Prefix_Exception_Messages from configuration pragmas
2042 SPARK_Mode_Config : SPARK_Mode_Type := None;
2044 -- The setting of SPARK_Mode from configuration pragmas
2046 SPARK_Mode_Pragma_Config : Node_Id := Empty;
2047 -- If a SPARK_Mode pragma appeared in the configuration pragmas (setting
2048 -- SPARK_Mode_Config appropriately), then this points to the N_Pragma node.
2050 Uneval_Old_Config : Character;
2052 -- The setting of Uneval_Old from configuration pragmas
2054 Use_VADS_Size_Config : Boolean;
2056 -- This is the value of the configuration switch that controls the use of
2057 -- VADS_Size instead of Size wherever the attribute Size is used. It can
2058 -- be set True by the use of the pragma Use_VADS_Size in the gnat.adc file.
2059 -- This flag is used to set the initial value for Use_VADS_Size at the
2060 -- start of analyzing each unit. Note however that the setting of this flag
2061 -- is ignored for internal and predefined units (which are always compiled
2062 -- with the standard Size semantics).
2064 Warnings_As_Errors_Count_Config : Natural;
2066 -- Count of pattern strings stored from Warning_As_Error pragmas
2068 type Config_Switches_Type is private;
2069 -- Type used to save values of the switches set from Config values
2071 procedure Save_Opt_Config_Switches (Save : out Config_Switches_Type);
2072 -- This procedure saves the current values of the switches which are
2073 -- initialized from the above Config values, and then resets these switches
2074 -- according to the Config value settings.
2076 procedure Set_Opt_Config_Switches
2077 (Internal_Unit : Boolean;
2078 Main_Unit : Boolean);
2079 -- This procedure sets the switches to the appropriate initial values. The
2080 -- parameter Internal_Unit is True for an internal or predefined unit, and
2081 -- affects the way the switches are set (see above). Main_Unit is true if
2082 -- switches are being set for the main unit or for the spec of the main
2083 -- unit. This affects setting of the assert/debug pragma switches, which
2084 -- are normally set false by default for an internal unit, except when the
2085 -- internal unit is the main unit, in which case we use the command line
2088 procedure Restore_Opt_Config_Switches (Save : Config_Switches_Type);
2089 -- This procedure restores a set of switch values previously saved by a
2090 -- call to Save_Opt_Config_Switches (Save).
2092 procedure Register_Opt_Config_Switches;
2093 -- This procedure is called after processing the gnat.adc file and other
2094 -- configuration pragma files to record the values of the Config switches,
2095 -- as possibly modified by the use of command line switches and pragmas
2096 -- appearing in these files.
2098 ------------------------
2099 -- Other Global Flags --
2100 ------------------------
2102 Expander_Active : Boolean := False;
2103 -- A flag that indicates if expansion is active (True) or deactivated
2104 -- (False). When expansion is deactivated all calls to expander routines
2105 -- have no effect. Note that the initial setting of False is merely to
2106 -- prevent saving of an undefined value for an initial call to the
2107 -- Expander_Mode_Save_And_Set procedure. For more information on the use of
2108 -- this flag, see package Expander. Indeed this flag might more logically
2109 -- be in the spec of Expander, but it is referenced by Errout, and it
2110 -- really seems wrong for Errout to depend on Expander.
2112 Static_Dispatch_Tables : Boolean := True;
2113 -- This flag indicates if the backend supports generation of statically
2114 -- allocated dispatch tables. If it is True, then the front end will
2115 -- generate static aggregates for dispatch tables that contain forward
2116 -- references to addresses of subprograms not seen yet, and the back end
2117 -- must be prepared to handle this case. If it is False, then the front
2118 -- end generates assignments to initialize the dispatch table, and there
2119 -- are no such forward references. By default we build statically allocated
2120 -- dispatch tables for all library level tagged types in all platforms.This
2121 -- behavior can be disabled using switch -gnatd.t which will set this flag
2122 -- to False and revert to the previous dynamic behavior.
2124 -----------------------
2125 -- Tree I/O Routines --
2126 -----------------------
2128 procedure Tree_Read;
2129 -- Reads switch settings from current tree file using Tree_Read
2131 procedure Tree_Write;
2132 -- Writes out switch settings to current tree file using Tree_Write
2134 --------------------------
2135 -- ASIS Version Control --
2136 --------------------------
2138 -- These two variables (Tree_Version_String and Tree_ASIS_Version_Number)
2139 -- are supposed to be used in the GNAT/ASIS version check performed in
2140 -- the ASIS code (this package is also a part of the ASIS implementation).
2141 -- They are set by Tree_Read procedure, so they represent the version
2142 -- number (and the version string) of the compiler which has created the
2143 -- tree, and they are supposed to be compared with the corresponding values
2144 -- from the Tree_IO and Gnatvsn packages which also are a part of ASIS
2147 Tree_Version_String : String_Access;
2148 -- Used to store the compiler version string read from a tree file to check
2149 -- if it is from the same date as stored in the version string in Gnatvsn.
2150 -- We require that ASIS Pro can be used only with GNAT Pro, but we allow
2151 -- non-Pro ASIS and ASIS-based tools to be used with any version of the
2152 -- GNAT compiler. Therefore, we need the possibility to compare the dates
2153 -- of the corresponding source sets, using version strings that may be
2154 -- of different lengths.
2156 Tree_ASIS_Version_Number : Int;
2157 -- Used to store the ASIS version number read from a tree file to check if
2158 -- it is the same as stored in the ASIS version number in Tree_IO.
2160 -----------------------------------
2161 -- Modes for Formal Verification --
2162 -----------------------------------
2164 GNATprove_Mode : Boolean := False;
2165 -- Specific compiling mode targeting formal verification for those parts
2166 -- of the input code that belong to the SPARK 2014 subset of Ada. Set True
2167 -- by the gnat2why executable or by use of the -gnatd.F debug switch. Note
2168 -- that this is completely separate from the SPARK restriction defined in
2169 -- GNAT to detect violations of a subset of SPARK 2005 rules.
2171 ---------------------------
2172 -- Error/Warning Control --
2173 ---------------------------
2175 -- The following array would more reasonably be located in Err_Vars or
2176 -- Errour, but we put them here to deal with licensing issues (we need
2177 -- this to have the GPL exception licensing, since these variables and
2178 -- subprograms are accessed from units with this licensing).
2180 Warnings_As_Errors : array (1 .. 10_000) of String_Ptr;
2181 -- Table for recording Warning_As_Error pragmas as they are processed.
2182 -- It would be nicer to use Table, but there are circular elaboration
2183 -- problems if we try to do this, and an attempt to find some other
2184 -- appropriately licensed unit to declare this as a Table failed with
2185 -- various elaboration circularities. Memory is getting cheap these days!
2191 GNAT_Mode : Boolean := False;
2193 -- True if compiling in GNAT system mode (-gnatg switch)
2195 GNAT_Mode_Config : Boolean := False;
2197 -- True if -gnatg switch is present. GNAT_Mode may be temporary set to
2198 -- True during the analysis of a system unit, but GNAT_Mode_Config must
2199 -- not change once scanned and set.
2201 -- Setting GNAT mode has the following effects on the language that is
2202 -- accepted. Note that several of the following have the effect of changing
2203 -- an error to a warning. But warnings are usually treated as fatal errors
2204 -- in -gnatg mode, so to actually take advantage of such a change, it is
2205 -- necessary to add an explicit pragma Warnings (Off) in the source and
2206 -- this requires clear documentation of why this is necessary.
2208 -- The identifier character set is set to 'n' (7-bit ASCII)
2210 -- Pragma Extend_System is ignored
2212 -- Warning_Mode is set to Treat_As_Error (-gnatwe)
2214 -- Standard style checks are set (See Set_GNAT_Style_Check_Options)
2216 -- Standard warnings are turned on (see Set_GNAT_Mode_Warnings)
2218 -- The Ada version is set to Ada 2012
2220 -- Task priorities are always allowed to be in the range Any_Priority
2222 -- Overflow checks are suppressed, overflow checking set to strict mode
2224 -- ALI files are always generated for predefined generic packages
2226 -- Obsolescent feature warnings are suppressed
2228 -- Recompilation of children of GNAT, System, Ada, Interfaces is allowed
2230 -- The Scalar_Storage_Order attribute applies to generic types
2232 -- Categorization errors are treated as warnings rather than errors
2234 -- Statements in preelaborated units give warnings rather than errors
2236 -- Private objects are allowed in preelaborated units
2238 -- Non-static constants in preelaborated units give warnings not errors
2240 -- The warning about component size being ignored is suppressed
2242 -- The warning about size clauses being ignored is suppressed
2244 -- Initializing limited types gives a warning rather than an error
2246 -- Copying of limited objects is allowed
2248 -- Returning objects of limited types is allowed
2250 -- Non-static call in preelaborated unit give a warning, not an error
2252 -- Warnings on possible elaboration errors are suppressed
2254 -- Warnings about packing being ignored are suppressed
2256 -- Warnings in internal units are not suppressed (they normally are)
2258 -- The only special comment sequence allowed is --!
2260 --------------------------
2261 -- Private Declarations --
2262 --------------------------
2266 -- The following type is used to save and restore settings of switches in
2267 -- Opt that represent the configuration (i.e. result of config pragmas).
2269 -- Note that Ada_Version_Explicit is not included, since this is a sticky
2270 -- flag that once set does not get reset, since the whole idea of this flag
2271 -- is to record the setting for the main unit.
2273 type Config_Switches_Type is record
2274 Ada_Version : Ada_Version_Type;
2275 Ada_Version_Explicit : Ada_Version_Type;
2276 Ada_Version_Pragma : Node_Id;
2277 Assertions_Enabled : Boolean;
2278 Assume_No_Invalid_Values : Boolean;
2279 Check_Float_Overflow : Boolean;
2280 Check_Policy_List : Node_Id;
2281 Default_Pool : Node_Id;
2282 Default_SSO : Character;
2283 Dynamic_Elaboration_Checks : Boolean;
2284 Exception_Locations_Suppressed : Boolean;
2285 Extensions_Allowed : Boolean;
2286 External_Name_Exp_Casing : External_Casing_Type;
2287 External_Name_Imp_Casing : External_Casing_Type;
2288 Fast_Math : Boolean;
2289 Initialize_Scalars : Boolean;
2290 Normalize_Scalars : Boolean;
2291 Optimize_Alignment : Character;
2292 Optimize_Alignment_Local : Boolean;
2293 Persistent_BSS_Mode : Boolean;
2294 Polling_Required : Boolean;
2295 Prefix_Exception_Messages : Boolean;
2296 SPARK_Mode : SPARK_Mode_Type;
2297 SPARK_Mode_Pragma : Node_Id;
2298 Uneval_Old : Character;
2299 Use_VADS_Size : Boolean;
2300 Warnings_As_Errors_Count : Natural;
2303 -- The following declarations are for GCC version dependent flags. We do
2304 -- not let client code in the compiler test GCC_Version directly, but
2305 -- instead use deferred constants for relevant feature tags.
2307 -- Note: there currently are no such constants defined in this section,
2308 -- since the compiler front end is currently entirely independent of the
2309 -- GCC version, which is a desirable state of affairs.
2311 function get_gcc_version return Int;
2312 pragma Import (C, get_gcc_version, "get_gcc_version");
2314 GCC_Version : constant Nat := get_gcc_version;
2316 -- Indicates which version of gcc is in use (3 = 3.x, 4 = 4.x). Note that
2317 -- gcc 2.8.1 (which used to be a value of 2) is no longer supported.
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