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1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- D E B U G --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1992-2016, Free Software Foundation, Inc. --
10 -- --
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. --
17 -- --
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. --
21 -- --
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/>. --
26 -- --
27 -- GNAT was originally developed by the GNAT team at New York University. --
28 -- Extensive contributions were provided by Ada Core Technologies Inc. --
29 -- --
30 ------------------------------------------------------------------------------
34 ---------------------------------
35 -- Summary of Debug Flag Usage --
36 ---------------------------------
38 -- Debug flags for compiler (GNAT1)
40 -- da Generate messages tracking semantic analyzer progress
41 -- db Show encoding of type names for debug output
42 -- dc List names of units as they are compiled
43 -- dd Dynamic allocation of tables messages generated
44 -- de List the entity table
45 -- df Full tree/source print (includes withed units)
46 -- dg Print source from tree (generated code only)
47 -- dh Generate listing showing loading of name table hash chains
48 -- di Generate messages for visibility linking/delinking
49 -- dj Suppress "junk null check" for access parameter values
50 -- dk Generate GNATBUG message on abort, even if previous errors
51 -- dl Generate unit load trace messages
52 -- dm
53 -- dn Generate messages for node/list allocation
54 -- do Print source from tree (original code only)
55 -- dp Generate messages for parser scope stack push/pops
56 -- dq No auto-alignment of small records
57 -- dr Generate parser resynchronization messages
58 -- ds Print source from tree (including original and generated stuff)
59 -- dt Print full tree
60 -- du Uncheck categorization pragmas
61 -- dv Output trace of overload resolution
62 -- dw Print trace of semantic scope stack
63 -- dx Force expansion on, even if no code being generated
64 -- dy Print tree of package Standard
65 -- dz Print source of package Standard
67 -- dA All entities included in representation information output
68 -- dB Output debug encoding of type names and variants
69 -- dC Output debugging information on check suppression
70 -- dD Delete elaboration checks in inner level routines
71 -- dE Apply elaboration checks to predefined units
72 -- dF Front end data layout enabled
73 -- dG Generate all warnings including those normally suppressed
74 -- dH Hold (kill) call to gigi
75 -- dI Inhibit internal name numbering in gnatG listing
76 -- dJ
77 -- dK Kill all error messages
78 -- dL Output trace information on elaboration checking
79 -- dM Assume all variables are modified (no current values)
80 -- dN No file name information in exception messages
81 -- dO Output immediate error messages
82 -- dP Do not check for controlled objects in preelaborable packages
83 -- dQ Use old secondary stack method
84 -- dR Bypass check for correct version of s-rpc
85 -- dS Never convert numbers to machine numbers in Sem_Eval
86 -- dT Convert to machine numbers only for constant declarations
87 -- dU Enable garbage collection of unreachable entities
88 -- dV Enable viewing of all symbols in debugger
89 -- dW Disable warnings on calls for IN OUT parameters
90 -- dX Display messages on reads of potentially uninitialized scalars
91 -- dY Enable configurable run-time mode
92 -- dZ Generate listing showing the contents of the dispatch tables
94 -- d.a Force Target_Strict_Alignment mode to True
95 -- d.b Dump backend types
96 -- d.c Generate inline concatenation, do not call procedure
97 -- d.d Disable atomic synchronization
98 -- d.e Enable atomic synchronization
99 -- d.f Inhibit folding of static expressions
100 -- d.g Enable conversion of raise into goto
101 -- d.h Minimize the creation of public internal symbols for concatenation
102 -- d.i Ignore Warnings pragmas
103 -- d.j Generate listing of frontend inlined calls
104 -- d.k Kill referenced run-time library unit line numbers
105 -- d.l Use Ada 95 semantics for limited function returns
106 -- d.m For -gnatl, print full source only for main unit
107 -- d.n Print source file names
108 -- d.o
109 -- d.p
110 -- d.q
111 -- d.r Enable OK_To_Reorder_Components in non-variant records
112 -- d.s
113 -- d.t Disable static allocation of library level dispatch tables
114 -- d.u Enable Modify_Tree_For_C (update tree for c)
115 -- d.v Enable OK_To_Reorder_Components in variant records
116 -- d.w Do not check for infinite loops
117 -- d.x No exception handlers
118 -- d.y
119 -- d.z Restore previous support for frontend handling of Inline_Always
121 -- d.A Read/write Aspect_Specifications hash table to tree
122 -- d.B Generate a bug box on abort_statement
123 -- d.C Generate concatenation call, do not generate inline code
124 -- d.D Disable errors on use of overriding keyword in Ada 95 mode
125 -- d.E Turn selected errors into warnings
126 -- d.F Debug mode for GNATprove
127 -- d.G Ignore calls through generic formal parameters for elaboration
128 -- d.H GNSA mode for ASIS
129 -- d.I Do not ignore enum representation clauses in CodePeer mode
130 -- d.J Disable parallel SCIL generation mode
131 -- d.K
132 -- d.L Depend on back end for limited types in if and case expressions
133 -- d.M Relaxed RM semantics
134 -- d.N Add node to all entities
135 -- d.O Dump internal SCO tables
136 -- d.P Previous (non-optimized) handling of length comparisons
137 -- d.Q Previous (incomplete) style check for binary operators
138 -- d.R Restrictions in ali files in positional form
139 -- d.S Force Optimize_Alignment (Space)
140 -- d.T Force Optimize_Alignment (Time)
141 -- d.U Ignore indirect calls for static elaboration
142 -- d.V Do not verify validity of SCIL files (CodePeer mode)
143 -- d.W Print out debugging information for Walk_Library_Items
144 -- d.X Old treatment of indexing aspects
145 -- d.Y
146 -- d.Z Do not enable expansion in configurable run-time mode
148 -- d1 Error msgs have node numbers where possible
149 -- d2 Eliminate error flags in verbose form error messages
150 -- d3 Dump bad node in Comperr on an abort
151 -- d4 Inhibit automatic krunch of predefined library unit files
152 -- d5 Debug output for tree read/write
153 -- d6 Default access unconstrained to thin pointers
154 -- d7 Suppress version/source stamp/compilation time for -gnatv/-gnatl
155 -- d8 Force opposite endianness in packed stuff
156 -- d9 Allow lock free implementation
158 -- d.1 Enable unnesting of nested procedures
159 -- d.2 Allow statements in declarative part
160 -- d.3 Output debugging information from Exp_Unst
161 -- d.4 Do not delete generated C file in case of errors
162 -- d.5 Do not generate imported subprogram definitions in C code
163 -- d.6
164 -- d.7
165 -- d.8
166 -- d.9
168 -- Debug flags for binder (GNATBIND)
170 -- da All links (including internal units) listed if there is a cycle
171 -- db Output information from Better_Choice
172 -- dc List units as they are chosen
173 -- dd
174 -- de Elaboration dependencies including system units
175 -- df
176 -- dg
177 -- dh
178 -- di Ignore_Errors mode for reading ali files
179 -- dj
180 -- dk
181 -- dl
182 -- dm
183 -- dn List details of manipulation of Num_Pred values
184 -- do Use old preference for elaboration order
185 -- dp
186 -- dq
187 -- dr
188 -- ds
189 -- dt
190 -- du List units as they are acquired
191 -- dv
192 -- dw
193 -- dx Force binder to read xref information from ali files
194 -- dy
195 -- dz
197 -- Debug flags used in package Make and its clients (e.g. GNATMAKE)
199 -- da
200 -- db
201 -- dc
202 -- dd
203 -- de
204 -- df Only output file names, not path names, in log
205 -- dg
206 -- dh Generate listing showing loading of name table hash chains
207 -- di
208 -- dj
209 -- dk
210 -- dl
211 -- dm Display the number of maximum simultaneous compilations
212 -- dn Do not delete temp files created by gnatmake
213 -- do
214 -- dp Prints the contents of the Q used by Make.Compile_Sources
215 -- dq Prints source files as they are enqueued and dequeued
216 -- dr
217 -- ds
218 -- dt Display time stamps when there is a mismatch
219 -- du List units as their ali files are acquired
220 -- dv
221 -- dw Prints the list of units withed by the unit currently explored
222 -- dx
223 -- dy
224 -- dz
226 --------------------------------------------
227 -- Documentation for Compiler Debug Flags --
228 --------------------------------------------
230 -- da Generate messages tracking semantic analyzer progress. A message
231 -- is output showing each node as it gets analyzed, expanded,
232 -- resolved, or evaluated. This option is useful for finding out
233 -- exactly where a bomb during semantic analysis is occurring.
235 -- db In Exp_Dbug, certain type names are encoded to include debugging
236 -- information. This debug switch causes lines to be output showing
237 -- the encodings used.
239 -- dc List names of units as they are compiled. One line of output will
240 -- be generated at the start of compiling each unit (package or
241 -- subprogram).
243 -- dd Dynamic allocation of tables messages generated. Each time a
244 -- table is reallocated, a line is output indicating the expansion.
246 -- de List the entity table
248 -- df Full tree/source print (includes withed units). Normally the tree
249 -- output (dt) or recreated source output (dg,do,ds) includes only
250 -- the main unit. If df is set, then the output in either case
251 -- includes all compiled units (see also dg,do,ds,dt). Note that to
252 -- be effective, this switch must be used in combination with one or
253 -- more of dt, dg, do or ds.
255 -- dg Print the source recreated from the generated tree. In the case
256 -- where the tree has been rewritten this output includes only the
257 -- generated code, not the original code (see also df,do,ds,dz).
258 -- This flag differs from -gnatG in that the output also includes
259 -- non-source generated null statements, and freeze nodes, which
260 -- are normally omitted in -gnatG mode.
262 -- dh Generates a table at the end of a compilation showing how the hash
263 -- table chains built by the Namet package are loaded. This is useful
264 -- in ensuring that the hashing algorithm (in Namet.Hash) is working
265 -- effectively with typical sets of program identifiers.
267 -- di Generate messages for visibility linking/delinking
269 -- dj Suppress "junk null check" for access parameters. This flag permits
270 -- Ada programs to pass null parameters to access parameters, and to
271 -- explicitly check such access values against the null literal.
272 -- Neither of these is valid Ada, but both were allowed in versions of
273 -- GNAT before 3.10, so this switch can ease the transition process.
275 -- dk Immediate kill on abort. Normally on an abort (i.e. a call to
276 -- Comperr.Compiler_Abort), the GNATBUG message is not given if
277 -- there is a previous error. This debug switch bypasses this test
278 -- and gives the message unconditionally (useful for debugging).
280 -- dl Generate unit load trace messages. A line of traceback output is
281 -- generated each time a request is made to the library manager to
282 -- load a new unit.
284 -- dn Generate messages for node/list allocation. Each time a node or
285 -- list header is allocated, a line of output is generated. Certain
286 -- other basic tree operations also cause a line of output to be
287 -- generated. This option is useful in seeing where the parser is
288 -- blowing up.
290 -- do Print the source recreated from the generated tree. In the case
291 -- where the tree has been rewritten, this output includes only the
292 -- original code, not the generated code (see also df,dg,ds,dz).
294 -- dp Generate messages for parser scope stack push/pops. A line of
295 -- output by the parser each time the parser scope stack is either
296 -- pushed or popped. Useful in debugging situations where the
297 -- parser scope stack ends up incorrectly synchronized
299 -- dq In layout version 1.38, 2002/01/12, a circuit was implemented
300 -- to give decent default alignment to short records that had no
301 -- specific alignment set. This debug option restores the previous
302 -- behavior of giving such records poor alignments, typically 1.
303 -- This may be useful in dealing with transition.
305 -- dr Generate parser resynchronization messages. Normally the parser
306 -- resynchronizes quietly. With this debug option, two messages
307 -- are generated, one when the parser starts a resynchronization
308 -- skip, and another when it resumes parsing. Useful in debugging
309 -- inadequate error recovery situations.
311 -- ds Print the source recreated from the generated tree. In the case
312 -- where the tree has been rewritten this output includes both the
313 -- generated code and the original code with the generated code
314 -- being enlosed in curly brackets (see also df,do,ds,dz)
316 -- dt Print full tree. The generated tree is output (see also df,dy)
318 -- du Uncheck categorization pragmas. This debug switch causes the
319 -- elaboration control pragmas (Pure, Preelaborate, etc.) and the
320 -- categorization pragmas (Shared_Passive, Remote_Types, etc.) to be
321 -- ignored, so that normal checks are not made (this is particularly
322 -- useful for adding temporary debugging code to units that have
323 -- pragmas that are inconsistent with the debugging code added).
325 -- dv Output trace of overload resolution. Outputs messages for
326 -- overload attempts that involve cascaded errors, or where
327 -- an interpretation is incompatible with the context.
329 -- dw Write semantic scope stack messages. Each time a scope is created
330 -- or removed, a message is output (see the Sem_Ch8.Push_Scope and
331 -- Sem_Ch8.Pop_Scope subprograms).
333 -- dx Force expansion on, even if no code being generated. Normally the
334 -- expander is inhibited if no code is generated. This switch forces
335 -- expansion to proceed normally even if the backend is not being
336 -- called. This is particularly useful for debugging purposes when
337 -- using the front-end only version of the compiler (which normally
338 -- would never do any expansion).
340 -- dy Print tree of package Standard. Normally the tree print out does
341 -- not include package Standard, even if the -df switch is set. This
342 -- switch forces output of the internal tree built for Standard.
344 -- dz Print source of package Standard. Normally the source print out
345 -- does not include package Standard, even if the -df switch is set.
346 -- This switch forces output of the source recreated from the internal
347 -- tree built for Standard. Note that this differs from -gnatS in
348 -- that it prints from the actual tree using the normal Sprint
349 -- circuitry for printing trees.
351 -- dA Forces output of representation information, including full
352 -- information for all internal type and object entities, as well
353 -- as all user defined type and object entities including private
354 -- and incomplete types. This debug switch also automatically sets
355 -- the equivalent of -gnatR3m.
357 -- dB Output debug encodings for types and variants. See Exp_Dbug for
358 -- exact form of the generated output.
360 -- dC Output trace information showing the decisions made during
361 -- check suppression activity in unit Checks.
363 -- dD Delete new elaboration checks. This flag causes GNAT to return
364 -- to the 3.13a elaboration semantics, and to suppress the fixing
365 -- of two bugs. The first is in the context of inner routines in
366 -- dynamic elaboration mode, when the subprogram we are in was
367 -- called at elaboration time by a unit that was also compiled with
368 -- dynamic elaboration checks. In this case, if A calls B calls C,
369 -- and all are in different units, we need an elaboration check at
370 -- each call. These nested checks were only put in recently (see
371 -- version 1.80 of Sem_Elab) and we provide this debug flag to
372 -- revert to the previous behavior in case of regressions. The
373 -- other behavior reverted by this flag is the treatment of the
374 -- Elaborate_Body pragma in static elaboration mode. This used to
375 -- be treated as not needing elaboration checking, but in fact in
376 -- general Elaborate_All is still required because of nested calls.
378 -- dE Apply compile time elaboration checking for with relations between
379 -- predefined units. Normally no checks are made (it seems that at
380 -- least on the SGI, such checks run into trouble).
382 -- dF Front end data layout enabled. Normally front end data layout
383 -- is only enabled if the target parameter Backend_Layout is False.
384 -- This debugging switch enables it unconditionally.
386 -- dG Generate all warnings. Normally Errout suppresses warnings on
387 -- units that are not part of the main extended source, and also
388 -- suppresses warnings on instantiations in the main extended
389 -- source that duplicate warnings already posted on the template.
390 -- This switch stops both kinds of deletion and causes Errout to
391 -- post all warnings sent to it.
393 -- dH Inhibit call to gigi. This is useful for testing front end data
394 -- layout, and may be useful in other debugging situations where
395 -- you do not want gigi to intefere with the testing.
397 -- dI Inhibit internal name numbering in gnatDG listing. Any sequence of
398 -- the form <uppercase-letter><digits><lowercase-letter> appearing in
399 -- a name is replaced by <uppercase-letter>...<lowercase-letter>. This
400 -- is used in the fixed bugs run to minimize system and version
401 -- dependency in filed -gnatD or -gnatG output.
403 -- dK Kill all error messages. This debug flag suppresses the output
404 -- of all error messages. It is used in regression tests where the
405 -- error messages are target dependent and irrelevant.
407 -- dL Output trace information on elaboration checking. This debug
408 -- switch causes output to be generated showing each call or
409 -- instantiation as it is checked, and the progress of the recursive
410 -- trace through calls at elaboration time.
412 -- dM Assume all variables have been modified, and ignore current value
413 -- indications. This debug flag disconnects the tracking of constant
414 -- values (see Exp_Ch2.Expand_Current_Value).
416 -- dN Do not generate file name information in exception messages
418 -- dO Output immediate error messages. This causes error messages to
419 -- be output as soon as they are generated (disconnecting several
420 -- circuits for improvement of messages, deletion of duplicate
421 -- messages etc). Useful to diagnose compiler bombs caused by
422 -- erroneous handling of error situations
424 -- dP Do not check for controlled objects in preelaborable packages.
425 -- RM 10.2.1(9) forbids the use of library level controlled objects
426 -- in preelaborable packages, but this restriction is a huge pain,
427 -- especially in the predefined library units.
429 -- dQ Use old method for determining what goes on the secondary stack.
430 -- This disables some newer optimizations. The intent is to use this
431 -- temporarily to measure before/after efficiency. ???Remove this
432 -- when we are done (see Sem_Util.Requires_Transient_Scope).
434 -- dR Bypass the check for a proper version of s-rpc being present
435 -- to use the -gnatz? switch. This allows debugging of the use
436 -- of stubs generation without needing to have GLADE (or some
437 -- other PCS installed).
439 -- dS Omit conversion of fpt numbers to exact machine numbers in
440 -- non-static evaluation contexts (see Check_Non_Static_Context).
441 -- This is intended for testing out timing problems with this
442 -- conversion circuit.
444 -- dT Similar to dS, but omits the conversions only in the case where
445 -- the parent is not a constant declaration.
447 -- dU Enable garbage collection of unreachable entities. This enables
448 -- both the reachability analysis and changing the Is_Public and
449 -- Is_Eliminated flags.
451 -- dV Enable viewing of all symbols in debugger. Causes debug information
452 -- to be generated for all symbols, including internal symbols. This
453 -- is enabled by default for -gnatD, but this switch allows this to
454 -- be enabled without generating modified source files. Note that the
455 -- use of -gnatdV ensures in the dwarf/elf case that all symbols that
456 -- are present in the elf tables are also in the dwarf tables (which
457 -- seems to be required by some tools). Another effect of dV is to
458 -- generate full qualified names, including internal names generated
459 -- for blocks and loops.
461 -- dW Disable warnings when a possibly uninitialized scalar value is
462 -- passed to an IN OUT parameter of a procedure. This usage is a
463 -- quite improper bounded error [erroneous in Ada 83] situation,
464 -- and would normally generate a warning. However, to ease the
465 -- task of transitioning incorrect legacy code, we provide this
466 -- undocumented feature for suppressing these warnings.
468 -- dY Enable configurable run-time mode, just as though the System file
469 -- had Configurable_Run_Time_Mode set to True. This is useful in
470 -- testing high integrity mode.
472 -- dZ Generate listing showing the contents of the dispatch tables. Each
473 -- line has an internally generated number used for references between
474 -- tagged types and primitives. For each primitive the output has the
475 -- following fields:
476 --
477 -- - Letter 'P' or letter 's': The former indicates that this
478 -- primitive will be located in a primary dispatch table. The
479 -- latter indicates that it will be located in a secondary
480 -- dispatch table.
481 --
482 -- - Name of the primitive. In case of predefined Ada primitives
483 -- the text "(predefined)" is added before the name, and these
484 -- acronyms are used: SR (Stream_Read), SW (Stream_Write), SI
485 -- (Stream_Input), SO (Stream_Output), DA (Deep_Adjust), DF
486 -- (Deep_Finalize). In addition Oeq identifies the equality
487 -- operator, and "_assign" the assignment.
488 --
489 -- - If the primitive covers interface types, two extra fields
490 -- referencing other primitives are generated: "Alias" references
491 -- the primitive of the tagged type that covers an interface
492 -- primitive, and "AI_Alias" references the covered interface
493 -- primitive.
494 --
495 -- - The expression "at #xx" indicates the slot of the dispatch
496 -- table occupied by such primitive in its corresponding primary
497 -- or secondary dispatch table.
498 --
499 -- - In case of abstract subprograms the text "is abstract" is
500 -- added at the end of the line.
502 -- d.a Force Target_Strict_Alignment to True, even on targets where it
503 -- would normally be false. Can be used for testing strict alignment
504 -- circuitry in the compiler.
506 -- d.b Dump back end types. During Create_Standard, the back end is
507 -- queried for all available types. This option shows them.
509 -- d.c Generate inline concatenation, instead of calling one of the
510 -- System.Concat_n.Str_Concat_n routines in cases where the latter
511 -- routines would normally be called.
513 -- d.d Disable atomic synchronization for all atomic variable references.
514 -- Pragma Enable_Atomic_Synchronization is ignored.
516 -- d.e Enable atomic synchronization for all atomic variable references.
517 -- Pragma Disable_Atomic_Synchronization is ignored, and also the
518 -- compiler switch -gnated is ignored.
520 -- d.f Suppress folding of static expressions. This of course results
521 -- in seriously non-conforming behavior, but is useful sometimes
522 -- when tracking down handling of complex expressions.
524 -- d.g Enables conversion of a raise statement into a goto when the
525 -- relevant handler is statically determinable. For now we only try
526 -- this if this debug flag is set. Later we will enable this more
527 -- generally by default.
529 -- d.h Minimize the creation of public internal symbols for concatenation
530 -- by enforcing a secondary stack-like handling of the final result.
531 -- The target of the concatenation is thus constrained in place and
532 -- initialized with the result instead of acting as its alias.
534 -- d.i Ignore all occurrences of pragma Warnings in the sources. This can
535 -- be used in particular to disable Warnings (Off) to check if any of
536 -- these statements are inappropriate.
538 -- d.k If an error message contains a reference to a location in an
539 -- internal unit, then suppress the line number in this reference.
541 -- d.j Generate listing of frontend inlined calls and inline calls passed
542 -- to the backend. This is useful to locate skipped calls that must be
543 -- inlined by the frontend.
545 -- d.l Use Ada 95 semantics for limited function returns. This may be
546 -- used to work around the incompatibility introduced by AI-318-2.
547 -- It is useful only in -gnat05 mode.
549 -- d.m When -gnatl is used, the normal output includes full listings of
550 -- all files in the extended main source (body/spec/subunits). If this
551 -- debug switch is used, then the full listing is given only for the
552 -- main source (this corresponds to a previous behavior of -gnatl and
553 -- is used for running the ACATS tests).
555 -- d.n Print source file names as they are loaded. This is useful if the
556 -- compiler has a bug -- these are the files that need to be included
557 -- in a bug report.
559 -- d.r Forces the flag OK_To_Reorder_Components to be set in all record
560 -- base types that have no discriminants.
562 -- d.t The compiler has been modified (a fairly extensive modification)
563 -- to generate static dispatch tables for library level tagged types.
564 -- This debug switch disables this modification and reverts to the
565 -- previous dynamic construction of tables. It is there as a possible
566 -- work around if we run into trouble with the new implementation.
568 -- d.u Sets Modify_Tree_For_C mode in which tree is modified to make it
569 -- easier to generate code using a C compiler.
571 -- d.v Forces the flag OK_To_Reorder_Components to be set in all record
572 -- base types that have at least one discriminant (v = variant).
574 -- d.w This flag turns off the scanning of loops to detect possible
575 -- infinite loops.
577 -- d.x No exception handlers in generated code. This causes exception
578 -- handlers to be eliminated from the generated code. They are still
579 -- fully compiled and analyzed, they just get eliminated from the
580 -- code generation step.
582 -- d.z Restore previous front-end support for Inline_Always. In default
583 -- mode, for targets that use the GCC back end, Inline_Always is
584 -- handled by the back end. Use of this switch restores the previous
585 -- handling of Inline_Always by the front end on such targets. For the
586 -- targets that do not use the GCC back end, this switch is ignored.
588 -- d.A There seems to be a problem with ASIS if we activate the circuit
589 -- for reading and writing the aspect specification hash table, so
590 -- for now, this is controlled by the debug flag d.A. The hash table
591 -- is only written and read if this flag is set.
593 -- d.B Generate a bug box when we see an abort_statement, even though
594 -- there is no bug. Useful for testing Comperr.Compiler_Abort: write
595 -- some code containing an abort_statement, and compile it with
596 -- -gnatd.B. There is nothing special about abort_statements; it just
597 -- provides a way to control where the bug box is generated. See "when
598 -- N_Abort_Statement" in package body Expander.
600 -- d.C Generate call to System.Concat_n.Str_Concat_n routines in cases
601 -- where we would normally generate inline concatenation code.
603 -- d.D For compatibility with some Ada 95 compilers implementing only
604 -- one feature of Ada 2005 (overriding keyword), disable errors on use
605 -- of overriding keyword in Ada 95 mode.
607 -- d.E Turn selected errors into warnings. This debug switch causes a
608 -- specific set of error messages into warnings. Setting this switch
609 -- causes Opt.Error_To_Warning to be set to True. The intention is
610 -- that this be used for messages representing upwards incompatible
611 -- changes to Ada 2012 that cause previously correct programs to be
612 -- treated as illegal now. The following cases are affected:
613 --
614 -- Errors relating to overlapping subprogram parameters for cases
615 -- other than IN OUT parameters to functions.
616 --
617 -- Errors relating to the new rules about not defining equality
618 -- too late so that composition of equality can be assured.
619 --
620 -- Errors relating to overriding indicators on protected subprogram
621 -- bodies (not an Ada 2012 incompatibility, but might cause errors
622 -- for existing programs assuming they were legal because GNAT
623 -- formerly allowed them).
625 -- d.F Sets GNATprove_Mode to True. This allows debugging the frontend in
626 -- the special mode used by GNATprove.
628 -- d.G Previously the compiler ignored calls via generic formal parameters
629 -- when doing the analysis for the static elaboration model. This is
630 -- now fixed, but we provide this debug flag to revert to the previous
631 -- situation of ignoring such calls to aid in transition.
633 -- d.H Sets ASIS_GNSA_Mode to True. This signals the front end to suppress
634 -- the call to gigi in ASIS_Mode.
636 -- d.I Do not ignore enum representation clauses in CodePeer mode.
637 -- The default of ignoring representation clauses for enumeration
638 -- types in CodePeer is good for the majority of Ada code, but in some
639 -- cases being able to change this default might be useful to remove
640 -- some false positives.
642 -- d.J Disable parallel SCIL generation. Normally SCIL file generation is
643 -- done in parallel to speed processing. This switch disables this
644 -- behavior.
646 -- d.L Normally the front end generates special expansion for conditional
647 -- expressions of a limited type. This debug flag removes this special
648 -- case expansion, leaving it up to the back end to handle conditional
649 -- expressions correctly.
651 -- d.M Relaxed RM semantics. This flag sets Opt.Relaxed_RM_Semantics
652 -- See Opt.Relaxed_RM_Semantics for more details.
654 -- d.N Enlarge entities by one node (but don't attempt to use this extra
655 -- node for storage of any flags or fields). This can be used to do
656 -- experiments on the impact of increasing entity sizes.
658 -- d.O Dump internal SCO tables. Before outputting the SCO information to
659 -- the ALI file, the internal SCO tables (SCO_Table/SCO_Unit_Table)
660 -- are dumped for debugging purposes.
662 -- d.P Previous non-optimized handling of length comparisons. Setting this
663 -- flag inhibits the effect of Optimize_Length_Comparison in Exp_Ch4.
664 -- This is there in case we find a situation where the optimization
665 -- malfunctions, to provide a work around.
667 -- d.Q Previous incomplete style checks for binary operators. Style checks
668 -- for token separation rules were incomplete and have been made
669 -- compliant with the documentation. For example, no warning was
670 -- issued for expressions such as 16-One or "A"&"B". Setting this flag
671 -- inhibits these new checks.
673 -- d.R As documented in lib-writ.ads, restrictions in the ali file can
674 -- have two forms, positional and named. The named notation is the
675 -- current preferred form, but the use of this debug switch will force
676 -- the use of the obsolescent positional form.
678 -- d.S Force Optimize_Alignment (Space) mode as the default
680 -- d.T Force Optimize_Alignment (Time) mode as the default
682 -- d.U Ignore indirect calls for static elaboration. The static
683 -- elaboration model is conservative, especially regarding indirect
684 -- calls. If you say Proc'Access, it will assume you might call
685 -- Proc. This can cause elaboration cycles at bind time. This flag
686 -- reverts to the behavior of earlier compilers, which ignored
687 -- indirect calls.
689 -- d.V Do not verify the validity of SCIL files (CodePeer mode). When
690 -- generating SCIL files for CodePeer, by default we verify that the
691 -- SCIL is well formed before saving it on disk. This switch can be
692 -- used to disable this checking, either to improve speed or to shut
693 -- down a false positive detected during the verification.
695 -- d.W Print out debugging information for Walk_Library_Items, including
696 -- the order in which units are walked. This is primarily for use in
697 -- debugging CodePeer mode.
699 -- d.X A previous version of GNAT allowed indexing aspects to be redefined
700 -- on derived container types, while the default iterator was
701 -- inherited from the parent type. This nonstandard extension is
702 -- preserved temporarily for use by the modeling project under debug
703 -- flag d.X.
705 -- d.Z Normally we always enable expansion in configurable run-time mode
706 -- to make sure we get error messages about unsupported features even
707 -- when compiling in -gnatc mode. But expansion is turned off in this
708 -- case if debug flag -gnatd.Z is used. This is to deal with the case
709 -- where we discover difficulties in this new processing.
711 -- d1 Error messages have node numbers where possible. Normally error
712 -- messages have only source locations. This option is useful when
713 -- debugging errors caused by expanded code, where the source location
714 -- does not give enough information.
716 -- d2 Suppress output of the error position flags for verbose form error
717 -- messages. The messages are still interspersed in the listing, but
718 -- without any error flags or extra blank lines. Also causes an extra
719 -- <<< to be output at the right margin. This is intended to be the
720 -- easiest format for checking conformance of ACATS B tests. This
721 -- flag also suppresses the additional messages explaining why a
722 -- non-static expression is non-static (see Sem_Eval.Why_Not_Static).
723 -- This avoids having to worry about these messages in ACATS testing.
725 -- d3 Causes Comperr to dump the contents of the node for which an abort
726 -- was detected (normally only the Node_Id of the node is output).
728 -- d4 Inhibits automatic krunching of predefined library unit file names.
729 -- Normally, as described in the spec of package Krunch, such files
730 -- are automatically krunched to 8 characters, with special treatment
731 -- of the prefixes Ada, System, and Interfaces. Setting this debug
732 -- switch disables this special treatment.
734 -- d5 Causes the tree read/write circuit to output detailed information
735 -- tracking the data that is read and written element by element.
737 -- d6 Normally access-to-unconstrained-array types are represented
738 -- using fat (double) pointers. Using this debug flag causes them
739 -- to default to thin. This can be used to test the performance
740 -- implications of using thin pointers, and also to test that the
741 -- compiler functions correctly with this choice.
743 -- d7 Normally a -gnatl or -gnatv listing includes the time stamp of the
744 -- source file and the time of the compilation. This debug flag can
745 -- be used to suppress this output, and also suppresses the message
746 -- with the version of the compiler. This is useful for regression
747 -- tests which need to have consistent output.
749 -- d8 This forces the packed stuff to generate code assuming the
750 -- opposite endianness from the actual correct value. Useful in
751 -- testing out code generation from the packed routines.
753 -- d9 This allows lock free implementation for protected objects
754 -- (see Exp_Ch9).
756 -- d.1 Sets Opt.Unnest_Subprogram_Mode to enable unnesting of subprograms.
757 -- This special pass does not actually unnest things, but it ensures
758 -- that a nested procedure does not contain any uplevel references.
759 -- See spec of Exp_Unst for full details.
761 -- d.2 Allow statements within declarative parts. This is not usually
762 -- allowed, but in some debugging contexts (e.g. testing the circuit
763 -- for unnesting of procedures), it is useful to allow this.
765 -- d.3 Output debugging information from Exp_Unst, including the name of
766 -- any unreachable subprograms that get deleted.
768 -- d.4 By default in case of an error during C generation, the .c or .h
769 -- file is deleted. This flag keeps the C file.
771 -- d.5 By default a subprogram imported generates a subprogram profile.
772 -- This debug flag disables this generation when generating C code,
773 -- assuming a proper #include will be used instead.
775 ------------------------------------------
776 -- Documentation for Binder Debug Flags --
777 ------------------------------------------
779 -- da Normally if there is an elaboration circularity, then in describing
780 -- the cycle, links involving internal units are omitted, since they
781 -- are irrelevant and confusing. This debug flag causes all links to
782 -- be listed, and is useful when diagnosing circularities introduced
783 -- by incorrect changes to the run-time library itself.
785 -- db Output debug information from Better_Choice in Binde, which uses
786 -- various heuristics to determine elaboration order in cases where
787 -- multiple orders are valid.
789 -- dc List units as they are chosen. As units are selected for addition to
790 -- the elaboration order, a line of output is generated showing which
791 -- unit has been selected.
793 -- de Similar to the effect of -e (output complete list of elaboration
794 -- dependencies) except that internal units are included in the
795 -- listing.
797 -- di Normally gnatbind calls Read_Ali with Ignore_Errors set to
798 -- False, since the binder really needs correct version ALI
799 -- files to do its job. This debug flag causes Ignore_Errors
800 -- mode to be set for the binder (and is particularly useful
801 -- for testing ignore errors mode).
803 -- dn List details of manipulation of Num_Pred values during execution of
804 -- the algorithm used to determine a correct order of elaboration. This
805 -- is useful in diagnosing any problems in its behavior.
807 -- do Use old elaboration order preference. The new preference rules
808 -- prefer specs with no bodies to specs with bodies, and between two
809 -- specs with bodies, prefers the one whose body is closer to being
810 -- able to be elaborated. This is a clear improvement, but we provide
811 -- this debug flag in case of regressions.
813 -- du List unit name and file name for each unit as it is read in
815 -- dx Force the binder to read (and then ignore) the xref information
816 -- in ali files (used to check that read circuit is working OK).
818 --------------------------------------------
819 -- Documentation for gnatmake Debug Flags --
820 --------------------------------------------
822 -- df Only output file names, not path names, in log
824 -- dh Generate listing showing loading of name table hash chains,
825 -- same as for the compiler.
827 -- dm Issue a message indicating the maximum number of simultaneous
828 -- compilations.
830 -- dn Do not delete temporary files created by gnatmake at the end
831 -- of execution, such as temporary config pragma files, mapping
832 -- files or project path files. This debug switch is equivalent to
833 -- the standard switch --keep-temp-files. We retain the debug switch
834 -- for back compatibility with past usage.
836 -- dp Prints the Q used by routine Make.Compile_Sources every time
837 -- we go around the main compile loop of Make.Compile_Sources
839 -- dq Prints source files as they are enqueued and dequeued in the Q
840 -- used by routine Make.Compile_Sources. Useful to figure out the
841 -- order in which sources are recompiled.
843 -- dt When a time stamp mismatch has been found for an ALI file,
844 -- display the source file name, the time stamp expected and
845 -- the time stamp found.
847 -- du List unit name and file name for each unit as it is read in
849 -- dw Prints the list of units withed by the unit currently explored
850 -- during the main loop of Make.Compile_Sources.
852 ---------------------------------------------
853 -- Documentation for gprbuild Debug Flags --
854 ---------------------------------------------
856 -- dm Display the maximum number of simultaneous compilations.
858 -- dn Do not delete temporary files created by gprbuild at the end
859 -- of execution, such as temporary config pragma files, mapping
860 -- files or project path files. This debug switch is equivalent to
861 -- the standard switch --keep-temp-files. We retain the debug switch
862 -- for back compatibility with past usage.
864 -- dt When a time stamp mismatch has been found for an ALI file,
865 -- display the source file name, the time stamp expected and
866 -- the time stamp found.
868 --------------------
869 -- Set_Debug_Flag --
870 --------------------
877 begin
956 else
1014 ---------------------------
1015 -- Set_Dotted_Debug_Flag --
1016 ---------------------------
1023 begin
1102 else