1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- A D A . E X C E P T I O N S --
9 -- Copyright (C) 1992-2006, 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 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
34 -- This version of Ada.Exceptions is a full Ada 95 version, but lacks the
35 -- additional definitions of Exception_Name returning Wide_[Wide_]String.
36 -- It is used for building the compiler and the basic tools, since these
37 -- builds may be done with bootstrap compilers that cannot handle these
38 -- additions. The full version of Ada.Exceptions can be found in the files
39 -- a-except-2005.ads/adb, and is used for all other builds where full Ada
40 -- 2005 functionality is required. in particular, it is used for building
41 -- run times on all targets.
44 -- We must turn polling off for this unit, because otherwise we get
45 -- elaboration circularities with System.Exception_Tables.
47 with System; use System;
48 with System.Standard_Library; use System.Standard_Library;
49 with System.Soft_Links; use System.Soft_Links;
51 package body Ada.Exceptions is
53 pragma Suppress (All_Checks);
54 -- We definitely do not want exceptions occurring within this unit, or
55 -- we are in big trouble. If an exceptional situation does occur, better
56 -- that it not be raised, since raising it can cause confusing chaos.
58 -----------------------
59 -- Local Subprograms --
60 -----------------------
62 -- Note: the exported subprograms in this package body are called directly
63 -- from C clients using the given external name, even though they are not
64 -- technically visible in the Ada sense.
66 procedure Process_Raise_Exception (E : Exception_Id);
67 pragma No_Return (Process_Raise_Exception);
68 -- This is the lowest level raise routine. It raises the exception
69 -- referenced by Current_Excep.all in the TSD, without deferring abort
70 -- (the caller must ensure that abort is deferred on entry).
72 procedure To_Stderr (S : String);
73 pragma Export (Ada, To_Stderr, "__gnat_to_stderr");
74 -- Little routine to output string to stderr that is also used
75 -- in the tasking run time.
77 procedure To_Stderr (C : Character);
78 pragma Inline (To_Stderr);
79 pragma Export (Ada, To_Stderr, "__gnat_to_stderr_char");
80 -- Little routine to output a character to stderr, used by some of
81 -- the separate units below.
83 package Exception_Data is
85 ---------------------------------
86 -- Exception messages routines --
87 ---------------------------------
89 procedure Set_Exception_C_Msg
91 Msg1 : System.Address;
93 Msg2 : System.Address := System.Null_Address);
94 -- This routine is called to setup the exception referenced by the
95 -- Current_Excep field in the TSD to contain the indicated Id value
96 -- and message. Msg1 is a null terminated string which is generated
97 -- as the exception message. If line is non-zero, then a colon and
98 -- the decimal representation of this integer is appended to the
99 -- message. When Msg2 is non-null, a space and this additional null
100 -- terminated string is added to the message.
102 procedure Set_Exception_Msg
105 -- This routine is called to setup the exception referenced by the
106 -- Current_Excep field in the TSD to contain the indicated Id value
107 -- and message. Message is a string which is generated as the
108 -- exception message.
110 --------------------------------------
111 -- Exception information subprogram --
112 --------------------------------------
114 function Exception_Information (X : Exception_Occurrence) return String;
115 -- The format of the exception information is as follows:
117 -- Exception_Name: <exception name> (as in Exception_Name)
118 -- Message: <message> (only if Exception_Message is empty)
119 -- PID=nnnn (only if != 0)
120 -- Call stack traceback locations: (only if at least one location)
121 -- <0xyyyyyyyy 0xyyyyyyyy ...> (is recorded)
123 -- The lines are separated by a ASCII.LF character.
124 -- The nnnn is the partition Id given as decimal digits.
125 -- The 0x... line represents traceback program counter locations, in
126 -- execution order with the first one being the exception location. It
129 -- The Exception_Name and Message lines are omitted in the abort
130 -- signal case, since this is not really an exception.
132 -- !! If the format of the generated string is changed, please note
133 -- !! that an equivalent modification to the routine String_To_EO must
134 -- !! be made to preserve proper functioning of the stream attributes.
136 ---------------------------------------
137 -- Exception backtracing subprograms --
138 ---------------------------------------
140 -- What is automatically output when exception tracing is on is the
141 -- usual exception information with the call chain backtrace possibly
142 -- tailored by a backtrace decorator. Modifying Exception_Information
143 -- itself is not a good idea because the decorated output is completely
144 -- out of control and would break all our code related to the streaming
145 -- of exceptions. We then provide an alternative function to compute
146 -- the possibly tailored output, which is equivalent if no decorator is
149 function Tailored_Exception_Information
150 (X : Exception_Occurrence) return String;
151 -- Exception information to be output in the case of automatic tracing
152 -- requested through GNAT.Exception_Traces.
154 -- This is the same as Exception_Information if no backtrace decorator
155 -- is currently in place. Otherwise, this is Exception_Information with
156 -- the call chain raw addresses replaced by the result of a call to the
157 -- current decorator provided with the call chain addresses.
160 (Ada, Tailored_Exception_Information,
161 "__gnat_tailored_exception_information");
162 -- This is currently used by System.Tasking.Stages
166 package Exception_Traces is
169 -- Imports Tailored_Exception_Information
171 ----------------------------------------------
172 -- Run-Time Exception Notification Routines --
173 ----------------------------------------------
175 -- These subprograms provide a common run-time interface to trigger the
176 -- actions required when an exception is about to be propagated (e.g.
177 -- user specified actions or output of exception information). They are
178 -- exported to be usable by the Ada exception handling personality
179 -- routine when the GCC 3 mechanism is used.
181 procedure Notify_Handled_Exception;
183 (C, Notify_Handled_Exception, "__gnat_notify_handled_exception");
184 -- This routine is called for a handled occurrence is about to be
187 procedure Notify_Unhandled_Exception;
189 (C, Notify_Unhandled_Exception, "__gnat_notify_unhandled_exception");
190 -- This routine is called when an unhandled occurrence is about to be
193 procedure Unhandled_Exception_Terminate;
194 pragma No_Return (Unhandled_Exception_Terminate);
195 -- This procedure is called to terminate execution following an
196 -- unhandled exception. The exception information, including
197 -- traceback if available is output, and execution is then
198 -- terminated. Note that at the point where this routine is
199 -- called, the stack has typically been destroyed.
201 end Exception_Traces;
203 package Exception_Propagation is
205 procedure Setup_Exception
208 Reraised : Boolean := False);
209 -- Dummy routine used to share a-exexda.adb, do nothing.
211 end Exception_Propagation;
213 package Stream_Attributes is
215 --------------------------------
216 -- Stream attributes routines --
217 --------------------------------
219 function EId_To_String (X : Exception_Id) return String;
220 function String_To_EId (S : String) return Exception_Id;
221 -- Functions for implementing Exception_Id stream attributes
223 function EO_To_String (X : Exception_Occurrence) return String;
224 function String_To_EO (S : String) return Exception_Occurrence;
225 -- Functions for implementing Exception_Occurrence stream
228 end Stream_Attributes;
230 procedure Raise_Current_Excep (E : Exception_Id);
231 pragma No_Return (Raise_Current_Excep);
232 pragma Export (C, Raise_Current_Excep, "__gnat_raise_nodefer_with_msg");
233 -- This is a simple wrapper to Process_Raise_Exception.
235 -- This external name for Raise_Current_Excep is historical, and probably
236 -- should be changed but for now we keep it, because gdb and gigi know
239 procedure Raise_Exception_No_Defer
240 (E : Exception_Id; Message : String := "");
242 (Ada, Raise_Exception_No_Defer,
243 "ada__exceptions__raise_exception_no_defer");
244 pragma No_Return (Raise_Exception_No_Defer);
245 -- Similar to Raise_Exception, but with no abort deferral
247 procedure Raise_With_Msg (E : Exception_Id);
248 pragma No_Return (Raise_With_Msg);
249 pragma Export (C, Raise_With_Msg, "__gnat_raise_with_msg");
250 -- Raises an exception with given exception id value. A message
251 -- is associated with the raise, and has already been stored in the
252 -- exception occurrence referenced by the Current_Excep in the TSD.
253 -- Abort is deferred before the raise call.
255 procedure Raise_With_Location_And_Msg
259 M : System.Address := System.Null_Address);
260 pragma No_Return (Raise_With_Location_And_Msg);
261 -- Raise an exception with given exception id value. A filename and line
262 -- number is associated with the raise and is stored in the exception
263 -- occurrence and in addition a string message M is appended to
264 -- this (if M is not null).
266 procedure Raise_Constraint_Error
267 (File : System.Address;
269 pragma No_Return (Raise_Constraint_Error);
271 (C, Raise_Constraint_Error, "__gnat_raise_constraint_error");
272 -- Raise constraint error with file:line information
274 procedure Raise_Constraint_Error_Msg
275 (File : System.Address;
277 Msg : System.Address);
278 pragma No_Return (Raise_Constraint_Error_Msg);
280 (C, Raise_Constraint_Error_Msg, "__gnat_raise_constraint_error_msg");
281 -- Raise constraint error with file:line + msg information
283 procedure Raise_Program_Error
284 (File : System.Address;
286 pragma No_Return (Raise_Program_Error);
288 (C, Raise_Program_Error, "__gnat_raise_program_error");
289 -- Raise program error with file:line information
291 procedure Raise_Program_Error_Msg
292 (File : System.Address;
294 Msg : System.Address);
295 pragma No_Return (Raise_Program_Error_Msg);
297 (C, Raise_Program_Error_Msg, "__gnat_raise_program_error_msg");
298 -- Raise program error with file:line + msg information
300 procedure Raise_Storage_Error
301 (File : System.Address;
303 pragma No_Return (Raise_Storage_Error);
305 (C, Raise_Storage_Error, "__gnat_raise_storage_error");
306 -- Raise storage error with file:line information
308 procedure Raise_Storage_Error_Msg
309 (File : System.Address;
311 Msg : System.Address);
312 pragma No_Return (Raise_Storage_Error_Msg);
314 (C, Raise_Storage_Error_Msg, "__gnat_raise_storage_error_msg");
315 -- Raise storage error with file:line + reason msg information
317 -- The exception raising process and the automatic tracing mechanism rely
318 -- on some careful use of flags attached to the exception occurrence. The
319 -- graph below illustrates the relations between the Raise_ subprograms
320 -- and identifies the points where basic flags such as Exception_Raised
323 -- (i) signs indicate the flags initialization points. R stands for Raise,
324 -- W for With, and E for Exception.
326 -- R_No_Msg R_E R_Pe R_Ce R_Se
328 -- +--+ +--+ +---+ | +---+
330 -- R_E_No_Defer(i) R_W_Msg(i) R_W_Loc
332 -- +------------+ | +-----------+ +--+
334 -- | | | Set_E_C_Msg(i)
336 -- Raise_Current_Excep
339 pragma No_Return (Reraise);
340 pragma Export (C, Reraise, "__gnat_reraise");
341 -- Reraises the exception referenced by the Current_Excep field of
342 -- the TSD (all fields of this exception occurrence are set). Abort
343 -- is deferred before the reraise operation.
345 -- Save_Occurrence variations: As the management of the private data
346 -- attached to occurrences is delicate, wether or not pointers to such
347 -- data has to be copied in various situations is better made explicit.
348 -- The following procedures provide an internal interface to help making
351 procedure Save_Occurrence_No_Private
352 (Target : out Exception_Occurrence;
353 Source : Exception_Occurrence);
354 -- Copy all the components of Source to Target, except the
355 -- Private_Data pointer.
357 procedure Transfer_Occurrence
358 (Target : Exception_Occurrence_Access;
359 Source : Exception_Occurrence);
360 pragma Export (C, Transfer_Occurrence, "__gnat_transfer_occurrence");
361 -- Called from System.Tasking.RendezVous.Exceptional_Complete_RendezVous
362 -- to setup Target from Source as an exception to be propagated in the
363 -- caller task. Target is expected to be a pointer to the fixed TSD
364 -- occurrence for this task.
366 -----------------------------
367 -- Run-Time Check Routines --
368 -----------------------------
370 -- These routines are called from the runtime to raise a specific
371 -- exception with a reason message attached. The parameters are
372 -- the file name and line number in each case. The names are keyed
373 -- to the codes defined in Types.ads and a-types.h (for example,
374 -- the name Rcheck_05 refers to the Reason whose Pos code is 5).
376 procedure Rcheck_00 (File : System.Address; Line : Integer);
377 procedure Rcheck_01 (File : System.Address; Line : Integer);
378 procedure Rcheck_02 (File : System.Address; Line : Integer);
379 procedure Rcheck_03 (File : System.Address; Line : Integer);
380 procedure Rcheck_04 (File : System.Address; Line : Integer);
381 procedure Rcheck_05 (File : System.Address; Line : Integer);
382 procedure Rcheck_06 (File : System.Address; Line : Integer);
383 procedure Rcheck_07 (File : System.Address; Line : Integer);
384 procedure Rcheck_08 (File : System.Address; Line : Integer);
385 procedure Rcheck_09 (File : System.Address; Line : Integer);
386 procedure Rcheck_10 (File : System.Address; Line : Integer);
387 procedure Rcheck_11 (File : System.Address; Line : Integer);
388 procedure Rcheck_12 (File : System.Address; Line : Integer);
389 procedure Rcheck_13 (File : System.Address; Line : Integer);
390 procedure Rcheck_14 (File : System.Address; Line : Integer);
391 procedure Rcheck_15 (File : System.Address; Line : Integer);
392 procedure Rcheck_16 (File : System.Address; Line : Integer);
393 procedure Rcheck_17 (File : System.Address; Line : Integer);
394 procedure Rcheck_18 (File : System.Address; Line : Integer);
395 procedure Rcheck_19 (File : System.Address; Line : Integer);
396 procedure Rcheck_20 (File : System.Address; Line : Integer);
397 procedure Rcheck_21 (File : System.Address; Line : Integer);
398 procedure Rcheck_22 (File : System.Address; Line : Integer);
399 procedure Rcheck_23 (File : System.Address; Line : Integer);
400 procedure Rcheck_24 (File : System.Address; Line : Integer);
401 procedure Rcheck_25 (File : System.Address; Line : Integer);
402 procedure Rcheck_26 (File : System.Address; Line : Integer);
403 procedure Rcheck_27 (File : System.Address; Line : Integer);
404 procedure Rcheck_28 (File : System.Address; Line : Integer);
405 procedure Rcheck_29 (File : System.Address; Line : Integer);
406 procedure Rcheck_30 (File : System.Address; Line : Integer);
407 procedure Rcheck_31 (File : System.Address; Line : Integer);
408 procedure Rcheck_32 (File : System.Address; Line : Integer);
410 pragma Export (C, Rcheck_00, "__gnat_rcheck_00");
411 pragma Export (C, Rcheck_01, "__gnat_rcheck_01");
412 pragma Export (C, Rcheck_02, "__gnat_rcheck_02");
413 pragma Export (C, Rcheck_03, "__gnat_rcheck_03");
414 pragma Export (C, Rcheck_04, "__gnat_rcheck_04");
415 pragma Export (C, Rcheck_05, "__gnat_rcheck_05");
416 pragma Export (C, Rcheck_06, "__gnat_rcheck_06");
417 pragma Export (C, Rcheck_07, "__gnat_rcheck_07");
418 pragma Export (C, Rcheck_08, "__gnat_rcheck_08");
419 pragma Export (C, Rcheck_09, "__gnat_rcheck_09");
420 pragma Export (C, Rcheck_10, "__gnat_rcheck_10");
421 pragma Export (C, Rcheck_11, "__gnat_rcheck_11");
422 pragma Export (C, Rcheck_12, "__gnat_rcheck_12");
423 pragma Export (C, Rcheck_13, "__gnat_rcheck_13");
424 pragma Export (C, Rcheck_14, "__gnat_rcheck_14");
425 pragma Export (C, Rcheck_15, "__gnat_rcheck_15");
426 pragma Export (C, Rcheck_16, "__gnat_rcheck_16");
427 pragma Export (C, Rcheck_17, "__gnat_rcheck_17");
428 pragma Export (C, Rcheck_18, "__gnat_rcheck_18");
429 pragma Export (C, Rcheck_19, "__gnat_rcheck_19");
430 pragma Export (C, Rcheck_20, "__gnat_rcheck_20");
431 pragma Export (C, Rcheck_21, "__gnat_rcheck_21");
432 pragma Export (C, Rcheck_22, "__gnat_rcheck_22");
433 pragma Export (C, Rcheck_23, "__gnat_rcheck_23");
434 pragma Export (C, Rcheck_24, "__gnat_rcheck_24");
435 pragma Export (C, Rcheck_25, "__gnat_rcheck_25");
436 pragma Export (C, Rcheck_26, "__gnat_rcheck_26");
437 pragma Export (C, Rcheck_27, "__gnat_rcheck_27");
438 pragma Export (C, Rcheck_28, "__gnat_rcheck_28");
439 pragma Export (C, Rcheck_29, "__gnat_rcheck_29");
440 pragma Export (C, Rcheck_30, "__gnat_rcheck_30");
441 pragma Export (C, Rcheck_31, "__gnat_rcheck_31");
442 pragma Export (C, Rcheck_32, "__gnat_rcheck_32");
444 -- None of these procedures ever returns (they raise an exception!). By
445 -- using pragma No_Return, we ensure that any junk code after the call,
446 -- such as normal return epilog stuff, can be eliminated).
448 pragma No_Return (Rcheck_00);
449 pragma No_Return (Rcheck_01);
450 pragma No_Return (Rcheck_02);
451 pragma No_Return (Rcheck_03);
452 pragma No_Return (Rcheck_04);
453 pragma No_Return (Rcheck_05);
454 pragma No_Return (Rcheck_06);
455 pragma No_Return (Rcheck_07);
456 pragma No_Return (Rcheck_08);
457 pragma No_Return (Rcheck_09);
458 pragma No_Return (Rcheck_10);
459 pragma No_Return (Rcheck_11);
460 pragma No_Return (Rcheck_12);
461 pragma No_Return (Rcheck_13);
462 pragma No_Return (Rcheck_14);
463 pragma No_Return (Rcheck_15);
464 pragma No_Return (Rcheck_16);
465 pragma No_Return (Rcheck_17);
466 pragma No_Return (Rcheck_18);
467 pragma No_Return (Rcheck_19);
468 pragma No_Return (Rcheck_20);
469 pragma No_Return (Rcheck_21);
470 pragma No_Return (Rcheck_22);
471 pragma No_Return (Rcheck_23);
472 pragma No_Return (Rcheck_24);
473 pragma No_Return (Rcheck_25);
474 pragma No_Return (Rcheck_26);
475 pragma No_Return (Rcheck_27);
476 pragma No_Return (Rcheck_28);
477 pragma No_Return (Rcheck_29);
478 pragma No_Return (Rcheck_30);
479 pragma No_Return (Rcheck_32);
481 ---------------------------------------------
482 -- Reason Strings for Run-Time Check Calls --
483 ---------------------------------------------
485 -- These strings are null-terminated and are used by Rcheck_nn. The
486 -- strings correspond to the definitions for Types.RT_Exception_Code.
490 Rmsg_00 : constant String := "access check failed" & NUL;
491 Rmsg_01 : constant String := "access parameter is null" & NUL;
492 Rmsg_02 : constant String := "discriminant check failed" & NUL;
493 Rmsg_03 : constant String := "divide by zero" & NUL;
494 Rmsg_04 : constant String := "explicit raise" & NUL;
495 Rmsg_05 : constant String := "index check failed" & NUL;
496 Rmsg_06 : constant String := "invalid data" & NUL;
497 Rmsg_07 : constant String := "length check failed" & NUL;
498 Rmsg_08 : constant String := "null Exception_Id" & NUL;
499 Rmsg_09 : constant String := "null-exclusion check failed" & NUL;
500 Rmsg_10 : constant String := "overflow check failed" & NUL;
501 Rmsg_11 : constant String := "partition check failed" & NUL;
502 Rmsg_12 : constant String := "range check failed" & NUL;
503 Rmsg_13 : constant String := "tag check failed" & NUL;
504 Rmsg_14 : constant String := "access before elaboration" & NUL;
505 Rmsg_15 : constant String := "accessibility check failed" & NUL;
506 Rmsg_16 : constant String := "all guards closed" & NUL;
507 Rmsg_17 : constant String := "duplicated entry address" & NUL;
508 Rmsg_18 : constant String := "explicit raise" & NUL;
509 Rmsg_19 : constant String := "finalize/adjust raised exception" & NUL;
510 Rmsg_20 : constant String := "implicit return with No_Return" & NUL;
511 Rmsg_21 : constant String := "misaligned address value" & NUL;
512 Rmsg_22 : constant String := "missing return" & NUL;
513 Rmsg_23 : constant String := "overlaid controlled object" & NUL;
514 Rmsg_24 : constant String := "potentially blocking operation" & NUL;
515 Rmsg_25 : constant String := "stubbed subprogram called" & NUL;
516 Rmsg_26 : constant String := "unchecked union restriction" & NUL;
517 Rmsg_27 : constant String := "illegal use of remote access-to-" &
518 "class-wide type, see RM E.4(18)" & NUL;
519 Rmsg_28 : constant String := "empty storage pool" & NUL;
520 Rmsg_29 : constant String := "explicit raise" & NUL;
521 Rmsg_30 : constant String := "infinite recursion" & NUL;
522 Rmsg_31 : constant String := "object too large" & NUL;
523 Rmsg_32 : constant String := "restriction violation" & NUL;
525 -----------------------
526 -- Polling Interface --
527 -----------------------
529 type Unsigned is mod 2 ** 32;
531 Counter : Unsigned := 0;
532 pragma Warnings (Off, Counter);
533 -- This counter is provided for convenience. It can be used in Poll to
534 -- perform periodic but not systematic operations.
536 procedure Poll is separate;
537 -- The actual polling routine is separate, so that it can easily
538 -- be replaced with a target dependent version.
540 ------------------------------
541 -- Current_Target_Exception --
542 ------------------------------
544 function Current_Target_Exception return Exception_Occurrence is
546 return Null_Occurrence;
547 end Current_Target_Exception;
553 function EId_To_String (X : Exception_Id) return String
554 renames Stream_Attributes.EId_To_String;
560 -- We use the null string to represent the null occurrence, otherwise
561 -- we output the Exception_Information string for the occurrence.
563 function EO_To_String (X : Exception_Occurrence) return String
564 renames Stream_Attributes.EO_To_String;
566 ------------------------
567 -- Exception_Identity --
568 ------------------------
570 function Exception_Identity
571 (X : Exception_Occurrence) return Exception_Id
574 -- Note that the following test used to be here for the original
575 -- Ada 95 semantics, but these were modified by AI-241 to require
576 -- returning Null_Id instead of raising Constraint_Error.
578 -- if X.Id = Null_Id then
579 -- raise Constraint_Error;
583 end Exception_Identity;
585 ---------------------------
586 -- Exception_Information --
587 ---------------------------
589 function Exception_Information (X : Exception_Occurrence) return String is
591 if X.Id = Null_Id then
592 raise Constraint_Error;
595 return Exception_Data.Exception_Information (X);
596 end Exception_Information;
598 -----------------------
599 -- Exception_Message --
600 -----------------------
602 function Exception_Message (X : Exception_Occurrence) return String is
604 if X.Id = Null_Id then
605 raise Constraint_Error;
608 return X.Msg (1 .. X.Msg_Length);
609 end Exception_Message;
615 function Exception_Name (Id : Exception_Id) return String is
618 raise Constraint_Error;
621 return To_Ptr (Id.Full_Name) (1 .. Id.Name_Length - 1);
624 function Exception_Name (X : Exception_Occurrence) return String is
626 return Exception_Name (X.Id);
629 ---------------------------
630 -- Exception_Name_Simple --
631 ---------------------------
633 function Exception_Name_Simple (X : Exception_Occurrence) return String is
634 Name : constant String := Exception_Name (X);
640 exit when Name (P - 1) = '.';
644 -- Return result making sure lower bound is 1
647 subtype Rname is String (1 .. Name'Length - P + 1);
649 return Rname (Name (P .. Name'Length));
651 end Exception_Name_Simple;
657 package body Exception_Data is separate;
658 -- This package can be easily dummied out if we do not want the
659 -- basic support for exception messages (such as in Ada 83).
661 package body Exception_Propagation is
663 procedure Setup_Exception
666 Reraised : Boolean := False)
668 pragma Warnings (Off, Excep);
669 pragma Warnings (Off, Current);
670 pragma Warnings (Off, Reraised);
675 end Exception_Propagation;
677 ----------------------
678 -- Exception_Traces --
679 ----------------------
681 package body Exception_Traces is separate;
682 -- Depending on the underlying support for IO the implementation
683 -- will differ. Moreover we would like to dummy out this package
684 -- in case we do not want any exception tracing support. This is
685 -- why this package is separated.
687 -----------------------
688 -- Stream Attributes --
689 -----------------------
691 package body Stream_Attributes is separate;
692 -- This package can be easily dummied out if we do not want the
693 -- support for streaming Exception_Ids and Exception_Occurrences.
695 -----------------------------
696 -- Process_Raise_Exception --
697 -----------------------------
699 procedure Process_Raise_Exception (E : Exception_Id) is
700 pragma Inspection_Point (E);
701 -- This is so the debugger can reliably inspect the parameter
703 Jumpbuf_Ptr : constant Address := Get_Jmpbuf_Address.all;
704 Excep : constant EOA := Get_Current_Excep.all;
706 procedure builtin_longjmp (buffer : Address; Flag : Integer);
707 pragma No_Return (builtin_longjmp);
708 pragma Import (C, builtin_longjmp, "_gnat_builtin_longjmp");
711 -- WARNING: There should be no exception handler for this body
712 -- because this would cause gigi to prepend a setup for a new
713 -- jmpbuf to the sequence of statements in case of built-in sjljl.
714 -- We would then always get this new buf in Jumpbuf_Ptr instead of the
715 -- one for the exception we are handling, which would completely break
716 -- the whole design of this procedure.
718 -- If the jump buffer pointer is non-null, transfer control using
719 -- it. Otherwise announce an unhandled exception (note that this
720 -- means that we have no finalizations to do other than at the outer
721 -- level). Perform the necessary notification tasks in both cases.
723 if Jumpbuf_Ptr /= Null_Address then
724 if not Excep.Exception_Raised then
725 Excep.Exception_Raised := True;
726 Exception_Traces.Notify_Handled_Exception;
729 builtin_longjmp (Jumpbuf_Ptr, 1);
732 Exception_Traces.Notify_Unhandled_Exception;
733 Exception_Traces.Unhandled_Exception_Terminate;
735 end Process_Raise_Exception;
737 ----------------------------
738 -- Raise_Constraint_Error --
739 ----------------------------
741 procedure Raise_Constraint_Error
742 (File : System.Address;
746 Raise_With_Location_And_Msg
747 (Constraint_Error_Def'Access, File, Line);
748 end Raise_Constraint_Error;
750 --------------------------------
751 -- Raise_Constraint_Error_Msg --
752 --------------------------------
754 procedure Raise_Constraint_Error_Msg
755 (File : System.Address;
757 Msg : System.Address)
760 Raise_With_Location_And_Msg
761 (Constraint_Error_Def'Access, File, Line, Msg);
762 end Raise_Constraint_Error_Msg;
764 -------------------------
765 -- Raise_Current_Excep --
766 -------------------------
768 procedure Raise_Current_Excep (E : Exception_Id) is
770 pragma Inspection_Point (E);
771 -- This is so the debugger can reliably inspect the parameter when
772 -- inserting a breakpoint at the start of this procedure.
774 Id : Exception_Id := E;
775 pragma Volatile (Id);
776 pragma Warnings (Off, Id);
777 -- In order to provide support for breakpoints on unhandled exceptions,
778 -- the debugger will also need to be able to inspect the value of E from
779 -- another (inner) frame. So we need to make sure that if E is passed in
780 -- a register, its value is also spilled on stack. For this, we store
781 -- the parameter value in a local variable, and add a pragma Volatile to
782 -- make sure it is spilled. The pragma Warnings (Off) is needed because
783 -- the compiler knows that Id is not referenced and that this use of
784 -- pragma Volatile is peculiar!
787 Process_Raise_Exception (E);
788 end Raise_Current_Excep;
790 ---------------------
791 -- Raise_Exception --
792 ---------------------
794 procedure Raise_Exception
796 Message : String := "")
800 Exception_Data.Set_Exception_Msg (E, Message);
802 Raise_Current_Excep (E);
805 -- Note: if E is null, then we simply return, which is correct Ada 95
806 -- semantics. If we are operating in Ada 2005 mode, then the expander
807 -- generates a raise Constraint_Error immediately following the call
808 -- to provide the required Ada 2005 semantics (see AI-329). We do it
809 -- this way to avoid having run time dependencies on the Ada version.
814 ----------------------------
815 -- Raise_Exception_Always --
816 ----------------------------
818 procedure Raise_Exception_Always
820 Message : String := "")
823 Exception_Data.Set_Exception_Msg (E, Message);
825 Raise_Current_Excep (E);
826 end Raise_Exception_Always;
828 -------------------------------
829 -- Raise_From_Signal_Handler --
830 -------------------------------
832 procedure Raise_From_Signal_Handler
837 Exception_Data.Set_Exception_C_Msg (E, M);
839 Process_Raise_Exception (E);
840 end Raise_From_Signal_Handler;
842 -------------------------
843 -- Raise_Program_Error --
844 -------------------------
846 procedure Raise_Program_Error
847 (File : System.Address;
851 Raise_With_Location_And_Msg
852 (Program_Error_Def'Access, File, Line);
853 end Raise_Program_Error;
855 -----------------------------
856 -- Raise_Program_Error_Msg --
857 -----------------------------
859 procedure Raise_Program_Error_Msg
860 (File : System.Address;
862 Msg : System.Address)
865 Raise_With_Location_And_Msg
866 (Program_Error_Def'Access, File, Line, Msg);
867 end Raise_Program_Error_Msg;
869 -------------------------
870 -- Raise_Storage_Error --
871 -------------------------
873 procedure Raise_Storage_Error
874 (File : System.Address;
878 Raise_With_Location_And_Msg
879 (Storage_Error_Def'Access, File, Line);
880 end Raise_Storage_Error;
882 -----------------------------
883 -- Raise_Storage_Error_Msg --
884 -----------------------------
886 procedure Raise_Storage_Error_Msg
887 (File : System.Address;
889 Msg : System.Address)
892 Raise_With_Location_And_Msg
893 (Storage_Error_Def'Access, File, Line, Msg);
894 end Raise_Storage_Error_Msg;
896 ---------------------------------
897 -- Raise_With_Location_And_Msg --
898 ---------------------------------
900 procedure Raise_With_Location_And_Msg
904 M : System.Address := System.Null_Address)
907 Exception_Data.Set_Exception_C_Msg (E, F, L, M);
909 Raise_Current_Excep (E);
910 end Raise_With_Location_And_Msg;
916 procedure Raise_With_Msg (E : Exception_Id) is
917 Excep : constant EOA := Get_Current_Excep.all;
920 Excep.Exception_Raised := False;
922 Excep.Num_Tracebacks := 0;
923 Excep.Cleanup_Flag := False;
924 Excep.Pid := Local_Partition_ID;
926 Raise_Current_Excep (E);
929 --------------------------------------
930 -- Calls to Run-Time Check Routines --
931 --------------------------------------
933 procedure Rcheck_00 (File : System.Address; Line : Integer) is
935 Raise_Constraint_Error_Msg (File, Line, Rmsg_00'Address);
938 procedure Rcheck_01 (File : System.Address; Line : Integer) is
940 Raise_Constraint_Error_Msg (File, Line, Rmsg_01'Address);
943 procedure Rcheck_02 (File : System.Address; Line : Integer) is
945 Raise_Constraint_Error_Msg (File, Line, Rmsg_02'Address);
948 procedure Rcheck_03 (File : System.Address; Line : Integer) is
950 Raise_Constraint_Error_Msg (File, Line, Rmsg_03'Address);
953 procedure Rcheck_04 (File : System.Address; Line : Integer) is
955 Raise_Constraint_Error_Msg (File, Line, Rmsg_04'Address);
958 procedure Rcheck_05 (File : System.Address; Line : Integer) is
960 Raise_Constraint_Error_Msg (File, Line, Rmsg_05'Address);
963 procedure Rcheck_06 (File : System.Address; Line : Integer) is
965 Raise_Constraint_Error_Msg (File, Line, Rmsg_06'Address);
968 procedure Rcheck_07 (File : System.Address; Line : Integer) is
970 Raise_Constraint_Error_Msg (File, Line, Rmsg_07'Address);
973 procedure Rcheck_08 (File : System.Address; Line : Integer) is
975 Raise_Constraint_Error_Msg (File, Line, Rmsg_08'Address);
978 procedure Rcheck_09 (File : System.Address; Line : Integer) is
980 Raise_Constraint_Error_Msg (File, Line, Rmsg_09'Address);
983 procedure Rcheck_10 (File : System.Address; Line : Integer) is
985 Raise_Constraint_Error_Msg (File, Line, Rmsg_10'Address);
988 procedure Rcheck_11 (File : System.Address; Line : Integer) is
990 Raise_Constraint_Error_Msg (File, Line, Rmsg_11'Address);
993 procedure Rcheck_12 (File : System.Address; Line : Integer) is
995 Raise_Constraint_Error_Msg (File, Line, Rmsg_12'Address);
998 procedure Rcheck_13 (File : System.Address; Line : Integer) is
1000 Raise_Constraint_Error_Msg (File, Line, Rmsg_13'Address);
1003 procedure Rcheck_14 (File : System.Address; Line : Integer) is
1005 Raise_Program_Error_Msg (File, Line, Rmsg_14'Address);
1008 procedure Rcheck_15 (File : System.Address; Line : Integer) is
1010 Raise_Program_Error_Msg (File, Line, Rmsg_15'Address);
1013 procedure Rcheck_16 (File : System.Address; Line : Integer) is
1015 Raise_Program_Error_Msg (File, Line, Rmsg_16'Address);
1018 procedure Rcheck_17 (File : System.Address; Line : Integer) is
1020 Raise_Program_Error_Msg (File, Line, Rmsg_17'Address);
1023 procedure Rcheck_18 (File : System.Address; Line : Integer) is
1025 Raise_Program_Error_Msg (File, Line, Rmsg_18'Address);
1028 procedure Rcheck_19 (File : System.Address; Line : Integer) is
1030 Raise_Program_Error_Msg (File, Line, Rmsg_19'Address);
1033 procedure Rcheck_20 (File : System.Address; Line : Integer) is
1035 Raise_Program_Error_Msg (File, Line, Rmsg_20'Address);
1038 procedure Rcheck_21 (File : System.Address; Line : Integer) is
1040 Raise_Program_Error_Msg (File, Line, Rmsg_21'Address);
1043 procedure Rcheck_22 (File : System.Address; Line : Integer) is
1045 Raise_Program_Error_Msg (File, Line, Rmsg_22'Address);
1048 procedure Rcheck_23 (File : System.Address; Line : Integer) is
1050 Raise_Program_Error_Msg (File, Line, Rmsg_23'Address);
1053 procedure Rcheck_24 (File : System.Address; Line : Integer) is
1055 Raise_Program_Error_Msg (File, Line, Rmsg_24'Address);
1058 procedure Rcheck_25 (File : System.Address; Line : Integer) is
1060 Raise_Program_Error_Msg (File, Line, Rmsg_25'Address);
1063 procedure Rcheck_26 (File : System.Address; Line : Integer) is
1065 Raise_Program_Error_Msg (File, Line, Rmsg_26'Address);
1068 procedure Rcheck_27 (File : System.Address; Line : Integer) is
1070 Raise_Program_Error_Msg (File, Line, Rmsg_27'Address);
1073 procedure Rcheck_28 (File : System.Address; Line : Integer) is
1075 Raise_Storage_Error_Msg (File, Line, Rmsg_28'Address);
1078 procedure Rcheck_29 (File : System.Address; Line : Integer) is
1080 Raise_Storage_Error_Msg (File, Line, Rmsg_29'Address);
1083 procedure Rcheck_30 (File : System.Address; Line : Integer) is
1085 Raise_Storage_Error_Msg (File, Line, Rmsg_30'Address);
1088 procedure Rcheck_31 (File : System.Address; Line : Integer) is
1090 Raise_Storage_Error_Msg (File, Line, Rmsg_31'Address);
1093 procedure Rcheck_32 (File : System.Address; Line : Integer) is
1095 Raise_Storage_Error_Msg (File, Line, Rmsg_32'Address);
1102 procedure Reraise is
1103 Excep : constant EOA := Get_Current_Excep.all;
1107 Raise_Current_Excep (Excep.Id);
1110 ------------------------
1111 -- Reraise_Occurrence --
1112 ------------------------
1114 procedure Reraise_Occurrence (X : Exception_Occurrence) is
1116 if X.Id /= null then
1118 Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1119 Raise_Current_Excep (X.Id);
1121 end Reraise_Occurrence;
1123 -------------------------------
1124 -- Reraise_Occurrence_Always --
1125 -------------------------------
1127 procedure Reraise_Occurrence_Always (X : Exception_Occurrence) is
1130 Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1131 Raise_Current_Excep (X.Id);
1132 end Reraise_Occurrence_Always;
1134 ---------------------------------
1135 -- Reraise_Occurrence_No_Defer --
1136 ---------------------------------
1138 procedure Reraise_Occurrence_No_Defer (X : Exception_Occurrence) is
1140 Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1141 Raise_Current_Excep (X.Id);
1142 end Reraise_Occurrence_No_Defer;
1144 ---------------------
1145 -- Save_Occurrence --
1146 ---------------------
1148 procedure Save_Occurrence
1149 (Target : out Exception_Occurrence;
1150 Source : Exception_Occurrence)
1153 Save_Occurrence_No_Private (Target, Source);
1154 end Save_Occurrence;
1156 function Save_Occurrence (Source : Exception_Occurrence) return EOA is
1157 Target : constant EOA := new Exception_Occurrence;
1159 Save_Occurrence (Target.all, Source);
1161 end Save_Occurrence;
1163 --------------------------------
1164 -- Save_Occurrence_No_Private --
1165 --------------------------------
1167 procedure Save_Occurrence_No_Private
1168 (Target : out Exception_Occurrence;
1169 Source : Exception_Occurrence)
1172 Target.Id := Source.Id;
1173 Target.Msg_Length := Source.Msg_Length;
1174 Target.Num_Tracebacks := Source.Num_Tracebacks;
1175 Target.Pid := Source.Pid;
1176 Target.Cleanup_Flag := Source.Cleanup_Flag;
1178 Target.Msg (1 .. Target.Msg_Length) :=
1179 Source.Msg (1 .. Target.Msg_Length);
1181 Target.Tracebacks (1 .. Target.Num_Tracebacks) :=
1182 Source.Tracebacks (1 .. Target.Num_Tracebacks);
1183 end Save_Occurrence_No_Private;
1185 -------------------------
1186 -- Transfer_Occurrence --
1187 -------------------------
1189 procedure Transfer_Occurrence
1190 (Target : Exception_Occurrence_Access;
1191 Source : Exception_Occurrence)
1194 -- Setup Target as an exception to be propagated in the calling task
1195 -- (rendezvous-wise), taking care not to clobber the associated private
1196 -- data. Target is expected to be a pointer to the calling task's
1197 -- fixed TSD occurrence, which is very different from Get_Current_Excep
1198 -- here because this subprogram is called from the called task.
1200 Save_Occurrence_No_Private (Target.all, Source);
1201 end Transfer_Occurrence;
1207 function String_To_EId (S : String) return Exception_Id
1208 renames Stream_Attributes.String_To_EId;
1214 function String_To_EO (S : String) return Exception_Occurrence
1215 renames Stream_Attributes.String_To_EO;
1217 ------------------------------
1218 -- Raise_Exception_No_Defer --
1219 ------------------------------
1221 procedure Raise_Exception_No_Defer
1223 Message : String := "")
1226 Exception_Data.Set_Exception_Msg (E, Message);
1228 -- Do not call Abort_Defer.all, as specified by the spec
1230 Raise_Current_Excep (E);
1231 end Raise_Exception_No_Defer;
1237 procedure To_Stderr (C : Character) is
1239 type int is new Integer;
1241 procedure put_char_stderr (C : int);
1242 pragma Import (C, put_char_stderr, "put_char_stderr");
1245 put_char_stderr (Character'Pos (C));
1248 procedure To_Stderr (S : String) is
1250 for J in S'Range loop
1251 if S (J) /= ASCII.CR then