1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- A D A . E X C E P T I O N S --
9 -- Copyright (C) 1992-2009, 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 version of Ada.Exceptions is a full Ada 95 version, and Ada 2005
33 -- features such as the additional definitions of Exception_Name returning
34 -- 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.
45 pragma Style_Checks (All_Checks);
46 -- No subprogram ordering check, due to logical grouping
49 -- We must turn polling off for this unit, because otherwise we get
50 -- elaboration circularities with System.Exception_Tables.
52 with System; use System;
53 with System.Exceptions; use System.Exceptions;
54 with System.Standard_Library; use System.Standard_Library;
55 with System.Soft_Links; use System.Soft_Links;
57 package body Ada.Exceptions is
59 pragma Suppress (All_Checks);
60 -- We definitely do not want exceptions occurring within this unit, or
61 -- we are in big trouble. If an exceptional situation does occur, better
62 -- that it not be raised, since raising it can cause confusing chaos.
64 -----------------------
65 -- Local Subprograms --
66 -----------------------
68 -- Note: the exported subprograms in this package body are called directly
69 -- from C clients using the given external name, even though they are not
70 -- technically visible in the Ada sense.
72 procedure Process_Raise_Exception (E : Exception_Id);
73 pragma No_Return (Process_Raise_Exception);
74 -- This is the lowest level raise routine. It raises the exception
75 -- referenced by Current_Excep.all in the TSD, without deferring abort
76 -- (the caller must ensure that abort is deferred on entry).
78 procedure To_Stderr (S : String);
79 pragma Export (Ada, To_Stderr, "__gnat_to_stderr");
80 -- Little routine to output string to stderr that is also used
81 -- in the tasking run time.
83 procedure To_Stderr (C : Character);
84 pragma Inline (To_Stderr);
85 pragma Export (Ada, To_Stderr, "__gnat_to_stderr_char");
86 -- Little routine to output a character to stderr, used by some of
87 -- the separate units below.
89 package Exception_Data is
91 ---------------------------------
92 -- Exception messages routines --
93 ---------------------------------
95 procedure Set_Exception_C_Msg
97 Msg1 : System.Address;
99 Msg2 : System.Address := System.Null_Address);
100 -- This routine is called to setup the exception referenced by the
101 -- Current_Excep field in the TSD to contain the indicated Id value
102 -- and message. Msg1 is a null terminated string which is generated
103 -- as the exception message. If line is non-zero, then a colon and
104 -- the decimal representation of this integer is appended to the
105 -- message. When Msg2 is non-null, a space and this additional null
106 -- terminated string is added to the message.
108 procedure Set_Exception_Msg
111 -- This routine is called to setup the exception referenced by the
112 -- Current_Excep field in the TSD to contain the indicated Id value
113 -- and message. Message is a string which is generated as the
114 -- exception message.
116 --------------------------------------
117 -- Exception information subprogram --
118 --------------------------------------
120 function Exception_Information (X : Exception_Occurrence) return String;
121 -- The format of the exception information is as follows:
123 -- Exception_Name: <exception name> (as in Exception_Name)
124 -- Message: <message> (only if Exception_Message is empty)
125 -- PID=nnnn (only if != 0)
126 -- Call stack traceback locations: (only if at least one location)
127 -- <0xyyyyyyyy 0xyyyyyyyy ...> (is recorded)
129 -- The lines are separated by a ASCII.LF character.
130 -- The nnnn is the partition Id given as decimal digits.
131 -- The 0x... line represents traceback program counter locations, in
132 -- execution order with the first one being the exception location. It
135 -- The Exception_Name and Message lines are omitted in the abort
136 -- signal case, since this is not really an exception.
138 -- !! If the format of the generated string is changed, please note
139 -- !! that an equivalent modification to the routine String_To_EO must
140 -- !! be made to preserve proper functioning of the stream attributes.
142 ---------------------------------------
143 -- Exception backtracing subprograms --
144 ---------------------------------------
146 -- What is automatically output when exception tracing is on is the
147 -- usual exception information with the call chain backtrace possibly
148 -- tailored by a backtrace decorator. Modifying Exception_Information
149 -- itself is not a good idea because the decorated output is completely
150 -- out of control and would break all our code related to the streaming
151 -- of exceptions. We then provide an alternative function to compute
152 -- the possibly tailored output, which is equivalent if no decorator is
155 function Tailored_Exception_Information
156 (X : Exception_Occurrence) return String;
157 -- Exception information to be output in the case of automatic tracing
158 -- requested through GNAT.Exception_Traces.
160 -- This is the same as Exception_Information if no backtrace decorator
161 -- is currently in place. Otherwise, this is Exception_Information with
162 -- the call chain raw addresses replaced by the result of a call to the
163 -- current decorator provided with the call chain addresses.
166 (Ada, Tailored_Exception_Information,
167 "__gnat_tailored_exception_information");
168 -- This is currently used by System.Tasking.Stages
172 package Exception_Traces is
175 -- Imports Tailored_Exception_Information
177 ----------------------------------------------
178 -- Run-Time Exception Notification Routines --
179 ----------------------------------------------
181 -- These subprograms provide a common run-time interface to trigger the
182 -- actions required when an exception is about to be propagated (e.g.
183 -- user specified actions or output of exception information). They are
184 -- exported to be usable by the Ada exception handling personality
185 -- routine when the GCC 3 mechanism is used.
187 procedure Notify_Handled_Exception;
189 (C, Notify_Handled_Exception, "__gnat_notify_handled_exception");
190 -- This routine is called for a handled occurrence is about to be
193 procedure Notify_Unhandled_Exception;
195 (C, Notify_Unhandled_Exception, "__gnat_notify_unhandled_exception");
196 -- This routine is called when an unhandled occurrence is about to be
199 procedure Unhandled_Exception_Terminate;
200 pragma No_Return (Unhandled_Exception_Terminate);
201 -- This procedure is called to terminate execution following an
202 -- unhandled exception. The exception information, including
203 -- traceback if available is output, and execution is then
204 -- terminated. Note that at the point where this routine is
205 -- called, the stack has typically been destroyed.
207 end Exception_Traces;
209 package Exception_Propagation is
211 procedure Setup_Exception
214 Reraised : Boolean := False);
215 -- Dummy routine used to share a-exexda.adb, do nothing
217 end Exception_Propagation;
219 package Stream_Attributes is
221 --------------------------------
222 -- Stream attributes routines --
223 --------------------------------
225 function EId_To_String (X : Exception_Id) return String;
226 function String_To_EId (S : String) return Exception_Id;
227 -- Functions for implementing Exception_Id stream attributes
229 function EO_To_String (X : Exception_Occurrence) return String;
230 function String_To_EO (S : String) return Exception_Occurrence;
231 -- Functions for implementing Exception_Occurrence stream
234 end Stream_Attributes;
236 procedure Raise_Current_Excep (E : Exception_Id);
237 pragma No_Return (Raise_Current_Excep);
238 pragma Export (C, Raise_Current_Excep, "__gnat_raise_nodefer_with_msg");
239 -- This is a simple wrapper to Process_Raise_Exception.
241 -- This external name for Raise_Current_Excep is historical, and probably
242 -- should be changed but for now we keep it, because gdb and gigi know
245 procedure Raise_Exception_No_Defer
246 (E : Exception_Id; Message : String := "");
248 (Ada, Raise_Exception_No_Defer,
249 "ada__exceptions__raise_exception_no_defer");
250 pragma No_Return (Raise_Exception_No_Defer);
251 -- Similar to Raise_Exception, but with no abort deferral
253 procedure Raise_With_Msg (E : Exception_Id);
254 pragma No_Return (Raise_With_Msg);
255 pragma Export (C, Raise_With_Msg, "__gnat_raise_with_msg");
256 -- Raises an exception with given exception id value. A message
257 -- is associated with the raise, and has already been stored in the
258 -- exception occurrence referenced by the Current_Excep in the TSD.
259 -- Abort is deferred before the raise call.
261 procedure Raise_With_Location_And_Msg
265 M : System.Address := System.Null_Address);
266 pragma No_Return (Raise_With_Location_And_Msg);
267 -- Raise an exception with given exception id value. A filename and line
268 -- number is associated with the raise and is stored in the exception
269 -- occurrence and in addition a string message M is appended to
270 -- this (if M is not null).
272 procedure Raise_Constraint_Error
273 (File : System.Address;
275 pragma No_Return (Raise_Constraint_Error);
277 (C, Raise_Constraint_Error, "__gnat_raise_constraint_error");
278 -- Raise constraint error with file:line information
280 procedure Raise_Constraint_Error_Msg
281 (File : System.Address;
283 Msg : System.Address);
284 pragma No_Return (Raise_Constraint_Error_Msg);
286 (C, Raise_Constraint_Error_Msg, "__gnat_raise_constraint_error_msg");
287 -- Raise constraint error with file:line + msg information
289 procedure Raise_Program_Error
290 (File : System.Address;
292 pragma No_Return (Raise_Program_Error);
294 (C, Raise_Program_Error, "__gnat_raise_program_error");
295 -- Raise program error with file:line information
297 procedure Raise_Program_Error_Msg
298 (File : System.Address;
300 Msg : System.Address);
301 pragma No_Return (Raise_Program_Error_Msg);
303 (C, Raise_Program_Error_Msg, "__gnat_raise_program_error_msg");
304 -- Raise program error with file:line + msg information
306 procedure Raise_Storage_Error
307 (File : System.Address;
309 pragma No_Return (Raise_Storage_Error);
311 (C, Raise_Storage_Error, "__gnat_raise_storage_error");
312 -- Raise storage error with file:line information
314 procedure Raise_Storage_Error_Msg
315 (File : System.Address;
317 Msg : System.Address);
318 pragma No_Return (Raise_Storage_Error_Msg);
320 (C, Raise_Storage_Error_Msg, "__gnat_raise_storage_error_msg");
321 -- Raise storage error with file:line + reason msg information
323 -- The exception raising process and the automatic tracing mechanism rely
324 -- on some careful use of flags attached to the exception occurrence. The
325 -- graph below illustrates the relations between the Raise_ subprograms
326 -- and identifies the points where basic flags such as Exception_Raised
329 -- (i) signs indicate the flags initialization points. R stands for Raise,
330 -- W for With, and E for Exception.
332 -- R_No_Msg R_E R_Pe R_Ce R_Se
334 -- +--+ +--+ +---+ | +---+
336 -- R_E_No_Defer(i) R_W_Msg(i) R_W_Loc
338 -- +------------+ | +-----------+ +--+
340 -- | | | Set_E_C_Msg(i)
342 -- Raise_Current_Excep
345 pragma No_Return (Reraise);
346 pragma Export (C, Reraise, "__gnat_reraise");
347 -- Reraises the exception referenced by the Current_Excep field of
348 -- the TSD (all fields of this exception occurrence are set). Abort
349 -- is deferred before the reraise operation.
351 -- Save_Occurrence variations: As the management of the private data
352 -- attached to occurrences is delicate, whether or not pointers to such
353 -- data has to be copied in various situations is better made explicit.
354 -- The following procedures provide an internal interface to help making
357 procedure Save_Occurrence_No_Private
358 (Target : out Exception_Occurrence;
359 Source : Exception_Occurrence);
360 -- Copy all the components of Source to Target, except the
361 -- Private_Data pointer.
363 procedure Transfer_Occurrence
364 (Target : Exception_Occurrence_Access;
365 Source : Exception_Occurrence);
366 pragma Export (C, Transfer_Occurrence, "__gnat_transfer_occurrence");
367 -- Called from System.Tasking.RendezVous.Exceptional_Complete_RendezVous
368 -- to setup Target from Source as an exception to be propagated in the
369 -- caller task. Target is expected to be a pointer to the fixed TSD
370 -- occurrence for this task.
372 -----------------------------
373 -- Run-Time Check Routines --
374 -----------------------------
376 -- These routines raise a specific exception with a reason message
377 -- attached. The parameters are the file name and line number in each
378 -- case. The names are keyed to the codes defined in types.ads and
379 -- a-types.h (for example, the name Rcheck_05 refers to the Reason
380 -- RT_Exception_Code'Val (5)).
382 procedure Rcheck_00 (File : System.Address; Line : Integer);
383 procedure Rcheck_01 (File : System.Address; Line : Integer);
384 procedure Rcheck_02 (File : System.Address; Line : Integer);
385 procedure Rcheck_03 (File : System.Address; Line : Integer);
386 procedure Rcheck_04 (File : System.Address; Line : Integer);
387 procedure Rcheck_05 (File : System.Address; Line : Integer);
388 procedure Rcheck_06 (File : System.Address; Line : Integer);
389 procedure Rcheck_07 (File : System.Address; Line : Integer);
390 procedure Rcheck_08 (File : System.Address; Line : Integer);
391 procedure Rcheck_09 (File : System.Address; Line : Integer);
392 procedure Rcheck_10 (File : System.Address; Line : Integer);
393 procedure Rcheck_11 (File : System.Address; Line : Integer);
394 procedure Rcheck_12 (File : System.Address; Line : Integer);
395 procedure Rcheck_13 (File : System.Address; Line : Integer);
396 procedure Rcheck_14 (File : System.Address; Line : Integer);
397 procedure Rcheck_15 (File : System.Address; Line : Integer);
398 procedure Rcheck_16 (File : System.Address; Line : Integer);
399 procedure Rcheck_17 (File : System.Address; Line : Integer);
400 procedure Rcheck_18 (File : System.Address; Line : Integer);
401 procedure Rcheck_19 (File : System.Address; Line : Integer);
402 procedure Rcheck_20 (File : System.Address; Line : Integer);
403 procedure Rcheck_21 (File : System.Address; Line : Integer);
404 procedure Rcheck_22 (File : System.Address; Line : Integer);
405 procedure Rcheck_23 (File : System.Address; Line : Integer);
406 procedure Rcheck_24 (File : System.Address; Line : Integer);
407 procedure Rcheck_25 (File : System.Address; Line : Integer);
408 procedure Rcheck_26 (File : System.Address; Line : Integer);
409 procedure Rcheck_27 (File : System.Address; Line : Integer);
410 procedure Rcheck_28 (File : System.Address; Line : Integer);
411 procedure Rcheck_29 (File : System.Address; Line : Integer);
412 procedure Rcheck_30 (File : System.Address; Line : Integer);
413 procedure Rcheck_31 (File : System.Address; Line : Integer);
414 procedure Rcheck_32 (File : System.Address; Line : Integer);
415 procedure Rcheck_33 (File : System.Address; Line : Integer);
417 pragma Export (C, Rcheck_00, "__gnat_rcheck_00");
418 pragma Export (C, Rcheck_01, "__gnat_rcheck_01");
419 pragma Export (C, Rcheck_02, "__gnat_rcheck_02");
420 pragma Export (C, Rcheck_03, "__gnat_rcheck_03");
421 pragma Export (C, Rcheck_04, "__gnat_rcheck_04");
422 pragma Export (C, Rcheck_05, "__gnat_rcheck_05");
423 pragma Export (C, Rcheck_06, "__gnat_rcheck_06");
424 pragma Export (C, Rcheck_07, "__gnat_rcheck_07");
425 pragma Export (C, Rcheck_08, "__gnat_rcheck_08");
426 pragma Export (C, Rcheck_09, "__gnat_rcheck_09");
427 pragma Export (C, Rcheck_10, "__gnat_rcheck_10");
428 pragma Export (C, Rcheck_11, "__gnat_rcheck_11");
429 pragma Export (C, Rcheck_12, "__gnat_rcheck_12");
430 pragma Export (C, Rcheck_13, "__gnat_rcheck_13");
431 pragma Export (C, Rcheck_14, "__gnat_rcheck_14");
432 pragma Export (C, Rcheck_15, "__gnat_rcheck_15");
433 pragma Export (C, Rcheck_16, "__gnat_rcheck_16");
434 pragma Export (C, Rcheck_17, "__gnat_rcheck_17");
435 pragma Export (C, Rcheck_18, "__gnat_rcheck_18");
436 pragma Export (C, Rcheck_19, "__gnat_rcheck_19");
437 pragma Export (C, Rcheck_20, "__gnat_rcheck_20");
438 pragma Export (C, Rcheck_21, "__gnat_rcheck_21");
439 pragma Export (C, Rcheck_22, "__gnat_rcheck_22");
440 pragma Export (C, Rcheck_23, "__gnat_rcheck_23");
441 pragma Export (C, Rcheck_24, "__gnat_rcheck_24");
442 pragma Export (C, Rcheck_25, "__gnat_rcheck_25");
443 pragma Export (C, Rcheck_26, "__gnat_rcheck_26");
444 pragma Export (C, Rcheck_27, "__gnat_rcheck_27");
445 pragma Export (C, Rcheck_28, "__gnat_rcheck_28");
446 pragma Export (C, Rcheck_29, "__gnat_rcheck_29");
447 pragma Export (C, Rcheck_30, "__gnat_rcheck_30");
448 pragma Export (C, Rcheck_31, "__gnat_rcheck_31");
449 pragma Export (C, Rcheck_32, "__gnat_rcheck_32");
450 pragma Export (C, Rcheck_33, "__gnat_rcheck_33");
452 -- None of these procedures ever returns (they raise an exception!). By
453 -- using pragma No_Return, we ensure that any junk code after the call,
454 -- such as normal return epilog stuff, can be eliminated).
456 pragma No_Return (Rcheck_00);
457 pragma No_Return (Rcheck_01);
458 pragma No_Return (Rcheck_02);
459 pragma No_Return (Rcheck_03);
460 pragma No_Return (Rcheck_04);
461 pragma No_Return (Rcheck_05);
462 pragma No_Return (Rcheck_06);
463 pragma No_Return (Rcheck_07);
464 pragma No_Return (Rcheck_08);
465 pragma No_Return (Rcheck_09);
466 pragma No_Return (Rcheck_10);
467 pragma No_Return (Rcheck_11);
468 pragma No_Return (Rcheck_12);
469 pragma No_Return (Rcheck_13);
470 pragma No_Return (Rcheck_14);
471 pragma No_Return (Rcheck_15);
472 pragma No_Return (Rcheck_16);
473 pragma No_Return (Rcheck_17);
474 pragma No_Return (Rcheck_18);
475 pragma No_Return (Rcheck_19);
476 pragma No_Return (Rcheck_20);
477 pragma No_Return (Rcheck_21);
478 pragma No_Return (Rcheck_22);
479 pragma No_Return (Rcheck_23);
480 pragma No_Return (Rcheck_24);
481 pragma No_Return (Rcheck_25);
482 pragma No_Return (Rcheck_26);
483 pragma No_Return (Rcheck_27);
484 pragma No_Return (Rcheck_28);
485 pragma No_Return (Rcheck_29);
486 pragma No_Return (Rcheck_30);
487 pragma No_Return (Rcheck_32);
488 pragma No_Return (Rcheck_33);
490 ---------------------------------------------
491 -- Reason Strings for Run-Time Check Calls --
492 ---------------------------------------------
494 -- These strings are null-terminated and are used by Rcheck_nn. The
495 -- strings correspond to the definitions for Types.RT_Exception_Code.
499 Rmsg_00 : constant String := "access check failed" & NUL;
500 Rmsg_01 : constant String := "access parameter is null" & NUL;
501 Rmsg_02 : constant String := "discriminant check failed" & NUL;
502 Rmsg_03 : constant String := "divide by zero" & NUL;
503 Rmsg_04 : constant String := "explicit raise" & NUL;
504 Rmsg_05 : constant String := "index check failed" & NUL;
505 Rmsg_06 : constant String := "invalid data" & NUL;
506 Rmsg_07 : constant String := "length check failed" & NUL;
507 Rmsg_08 : constant String := "null Exception_Id" & NUL;
508 Rmsg_09 : constant String := "null-exclusion check failed" & NUL;
509 Rmsg_10 : constant String := "overflow check failed" & NUL;
510 Rmsg_11 : constant String := "partition check failed" & NUL;
511 Rmsg_12 : constant String := "range check failed" & NUL;
512 Rmsg_13 : constant String := "tag check failed" & NUL;
513 Rmsg_14 : constant String := "access before elaboration" & NUL;
514 Rmsg_15 : constant String := "accessibility check failed" & NUL;
515 Rmsg_16 : constant String := "attempt to take address of" &
516 " intrinsic subprogram" & NUL;
517 Rmsg_17 : constant String := "all guards closed" & NUL;
518 Rmsg_18 : constant String := "Current_Task referenced in entry" &
520 Rmsg_19 : constant String := "duplicated entry address" & NUL;
521 Rmsg_20 : constant String := "explicit raise" & NUL;
522 Rmsg_21 : constant String := "finalize/adjust raised exception" & NUL;
523 Rmsg_22 : constant String := "implicit return with No_Return" & NUL;
524 Rmsg_23 : constant String := "misaligned address value" & NUL;
525 Rmsg_24 : constant String := "missing return" & NUL;
526 Rmsg_25 : constant String := "overlaid controlled object" & NUL;
527 Rmsg_26 : constant String := "potentially blocking operation" & NUL;
528 Rmsg_27 : constant String := "stubbed subprogram called" & NUL;
529 Rmsg_28 : constant String := "unchecked union restriction" & NUL;
530 Rmsg_29 : constant String := "actual/returned class-wide" &
531 " value not transportable" & NUL;
532 Rmsg_30 : constant String := "empty storage pool" & NUL;
533 Rmsg_31 : constant String := "explicit raise" & NUL;
534 Rmsg_32 : constant String := "infinite recursion" & NUL;
535 Rmsg_33 : constant String := "object too large" & NUL;
537 -----------------------
538 -- Polling Interface --
539 -----------------------
541 type Unsigned is mod 2 ** 32;
543 Counter : Unsigned := 0;
544 pragma Warnings (Off, Counter);
545 -- This counter is provided for convenience. It can be used in Poll to
546 -- perform periodic but not systematic operations.
548 procedure Poll is separate;
549 -- The actual polling routine is separate, so that it can easily
550 -- be replaced with a target dependent version.
552 ------------------------------
553 -- Current_Target_Exception --
554 ------------------------------
556 function Current_Target_Exception return Exception_Occurrence is
558 return Null_Occurrence;
559 end Current_Target_Exception;
565 function EId_To_String (X : Exception_Id) return String
566 renames Stream_Attributes.EId_To_String;
572 -- We use the null string to represent the null occurrence, otherwise
573 -- we output the Exception_Information string for the occurrence.
575 function EO_To_String (X : Exception_Occurrence) return String
576 renames Stream_Attributes.EO_To_String;
578 ------------------------
579 -- Exception_Identity --
580 ------------------------
582 function Exception_Identity
583 (X : Exception_Occurrence) return Exception_Id
586 -- Note that the following test used to be here for the original
587 -- Ada 95 semantics, but these were modified by AI-241 to require
588 -- returning Null_Id instead of raising Constraint_Error.
590 -- if X.Id = Null_Id then
591 -- raise Constraint_Error;
595 end Exception_Identity;
597 ---------------------------
598 -- Exception_Information --
599 ---------------------------
601 function Exception_Information (X : Exception_Occurrence) return String is
603 if X.Id = Null_Id then
604 raise Constraint_Error;
607 return Exception_Data.Exception_Information (X);
608 end Exception_Information;
610 -----------------------
611 -- Exception_Message --
612 -----------------------
614 function Exception_Message (X : Exception_Occurrence) return String is
616 if X.Id = Null_Id then
617 raise Constraint_Error;
620 return X.Msg (1 .. X.Msg_Length);
621 end Exception_Message;
627 function Exception_Name (Id : Exception_Id) return String is
630 raise Constraint_Error;
633 return To_Ptr (Id.Full_Name) (1 .. Id.Name_Length - 1);
636 function Exception_Name (X : Exception_Occurrence) return String is
638 return Exception_Name (X.Id);
641 ---------------------------
642 -- Exception_Name_Simple --
643 ---------------------------
645 function Exception_Name_Simple (X : Exception_Occurrence) return String is
646 Name : constant String := Exception_Name (X);
652 exit when Name (P - 1) = '.';
656 -- Return result making sure lower bound is 1
659 subtype Rname is String (1 .. Name'Length - P + 1);
661 return Rname (Name (P .. Name'Length));
663 end Exception_Name_Simple;
669 package body Exception_Data is separate;
670 -- This package can be easily dummied out if we do not want the
671 -- basic support for exception messages (such as in Ada 83).
673 package body Exception_Propagation is
675 procedure Setup_Exception
678 Reraised : Boolean := False)
680 pragma Warnings (Off, Excep);
681 pragma Warnings (Off, Current);
682 pragma Warnings (Off, Reraised);
687 end Exception_Propagation;
689 ----------------------
690 -- Exception_Traces --
691 ----------------------
693 package body Exception_Traces is separate;
694 -- Depending on the underlying support for IO the implementation
695 -- will differ. Moreover we would like to dummy out this package
696 -- in case we do not want any exception tracing support. This is
697 -- why this package is separated.
699 -----------------------
700 -- Stream Attributes --
701 -----------------------
703 package body Stream_Attributes is separate;
704 -- This package can be easily dummied out if we do not want the
705 -- support for streaming Exception_Ids and Exception_Occurrences.
707 -----------------------------
708 -- Process_Raise_Exception --
709 -----------------------------
711 procedure Process_Raise_Exception (E : Exception_Id) is
712 pragma Inspection_Point (E);
713 -- This is so the debugger can reliably inspect the parameter
715 Jumpbuf_Ptr : constant Address := Get_Jmpbuf_Address.all;
716 Excep : constant EOA := Get_Current_Excep.all;
718 procedure builtin_longjmp (buffer : Address; Flag : Integer);
719 pragma No_Return (builtin_longjmp);
720 pragma Import (C, builtin_longjmp, "_gnat_builtin_longjmp");
723 -- WARNING: There should be no exception handler for this body
724 -- because this would cause gigi to prepend a setup for a new
725 -- jmpbuf to the sequence of statements in case of built-in sjljl.
726 -- We would then always get this new buf in Jumpbuf_Ptr instead of the
727 -- one for the exception we are handling, which would completely break
728 -- the whole design of this procedure.
730 -- If the jump buffer pointer is non-null, transfer control using
731 -- it. Otherwise announce an unhandled exception (note that this
732 -- means that we have no finalizations to do other than at the outer
733 -- level). Perform the necessary notification tasks in both cases.
735 if Jumpbuf_Ptr /= Null_Address then
736 if not Excep.Exception_Raised then
737 Excep.Exception_Raised := True;
738 Exception_Traces.Notify_Handled_Exception;
741 builtin_longjmp (Jumpbuf_Ptr, 1);
744 Exception_Traces.Notify_Unhandled_Exception;
745 Exception_Traces.Unhandled_Exception_Terminate;
747 end Process_Raise_Exception;
749 ----------------------------
750 -- Raise_Constraint_Error --
751 ----------------------------
753 procedure Raise_Constraint_Error
754 (File : System.Address;
758 Raise_With_Location_And_Msg
759 (Constraint_Error_Def'Access, File, Line);
760 end Raise_Constraint_Error;
762 --------------------------------
763 -- Raise_Constraint_Error_Msg --
764 --------------------------------
766 procedure Raise_Constraint_Error_Msg
767 (File : System.Address;
769 Msg : System.Address)
772 Raise_With_Location_And_Msg
773 (Constraint_Error_Def'Access, File, Line, Msg);
774 end Raise_Constraint_Error_Msg;
776 -------------------------
777 -- Raise_Current_Excep --
778 -------------------------
780 procedure Raise_Current_Excep (E : Exception_Id) is
782 pragma Inspection_Point (E);
783 -- This is so the debugger can reliably inspect the parameter when
784 -- inserting a breakpoint at the start of this procedure.
786 Id : Exception_Id := E;
787 pragma Volatile (Id);
788 pragma Warnings (Off, Id);
789 -- In order to provide support for breakpoints on unhandled exceptions,
790 -- the debugger will also need to be able to inspect the value of E from
791 -- another (inner) frame. So we need to make sure that if E is passed in
792 -- a register, its value is also spilled on stack. For this, we store
793 -- the parameter value in a local variable, and add a pragma Volatile to
794 -- make sure it is spilled. The pragma Warnings (Off) is needed because
795 -- the compiler knows that Id is not referenced and that this use of
796 -- pragma Volatile is peculiar!
799 Debug_Raise_Exception (E => SSL.Exception_Data_Ptr (E));
800 Process_Raise_Exception (E);
801 end Raise_Current_Excep;
803 ---------------------
804 -- Raise_Exception --
805 ---------------------
807 procedure Raise_Exception
809 Message : String := "")
811 EF : Exception_Id := E;
814 -- Raise CE if E = Null_ID (AI-446)
817 EF := Constraint_Error'Identity;
820 -- Go ahead and raise appropriate exception
822 Exception_Data.Set_Exception_Msg (EF, Message);
824 Raise_Current_Excep (EF);
827 ----------------------------
828 -- Raise_Exception_Always --
829 ----------------------------
831 procedure Raise_Exception_Always
833 Message : String := "")
836 Exception_Data.Set_Exception_Msg (E, Message);
838 Raise_Current_Excep (E);
839 end Raise_Exception_Always;
841 -------------------------------------
842 -- Raise_From_Controlled_Operation --
843 -------------------------------------
845 procedure Raise_From_Controlled_Operation
846 (X : Ada.Exceptions.Exception_Occurrence)
848 Prefix : constant String := "adjust/finalize raised ";
849 Orig_Msg : constant String := Exception_Message (X);
850 New_Msg : constant String := Prefix & Exception_Name (X);
853 if Orig_Msg'Length >= Prefix'Length
855 Orig_Msg (Orig_Msg'First .. Orig_Msg'First + Prefix'Length - 1) =
858 -- Message already has proper prefix, just re-reraise PROGRAM_ERROR
860 Raise_Exception_No_Defer
861 (E => Program_Error'Identity,
862 Message => Orig_Msg);
864 elsif Orig_Msg = "" then
866 -- No message present: just provide our own
868 Raise_Exception_No_Defer
869 (E => Program_Error'Identity,
873 -- Message present, add informational prefix
875 Raise_Exception_No_Defer
876 (E => Program_Error'Identity,
877 Message => New_Msg & ": " & Orig_Msg);
879 end Raise_From_Controlled_Operation;
881 -------------------------------
882 -- Raise_From_Signal_Handler --
883 -------------------------------
885 procedure Raise_From_Signal_Handler
890 Exception_Data.Set_Exception_C_Msg (E, M);
892 Process_Raise_Exception (E);
893 end Raise_From_Signal_Handler;
895 -------------------------
896 -- Raise_Program_Error --
897 -------------------------
899 procedure Raise_Program_Error
900 (File : System.Address;
904 Raise_With_Location_And_Msg
905 (Program_Error_Def'Access, File, Line);
906 end Raise_Program_Error;
908 -----------------------------
909 -- Raise_Program_Error_Msg --
910 -----------------------------
912 procedure Raise_Program_Error_Msg
913 (File : System.Address;
915 Msg : System.Address)
918 Raise_With_Location_And_Msg
919 (Program_Error_Def'Access, File, Line, Msg);
920 end Raise_Program_Error_Msg;
922 -------------------------
923 -- Raise_Storage_Error --
924 -------------------------
926 procedure Raise_Storage_Error
927 (File : System.Address;
931 Raise_With_Location_And_Msg
932 (Storage_Error_Def'Access, File, Line);
933 end Raise_Storage_Error;
935 -----------------------------
936 -- Raise_Storage_Error_Msg --
937 -----------------------------
939 procedure Raise_Storage_Error_Msg
940 (File : System.Address;
942 Msg : System.Address)
945 Raise_With_Location_And_Msg
946 (Storage_Error_Def'Access, File, Line, Msg);
947 end Raise_Storage_Error_Msg;
949 ---------------------------------
950 -- Raise_With_Location_And_Msg --
951 ---------------------------------
953 procedure Raise_With_Location_And_Msg
957 M : System.Address := System.Null_Address)
960 Exception_Data.Set_Exception_C_Msg (E, F, L, M);
962 Raise_Current_Excep (E);
963 end Raise_With_Location_And_Msg;
969 procedure Raise_With_Msg (E : Exception_Id) is
970 Excep : constant EOA := Get_Current_Excep.all;
973 Excep.Exception_Raised := False;
975 Excep.Num_Tracebacks := 0;
976 Excep.Cleanup_Flag := False;
977 Excep.Pid := Local_Partition_ID;
979 Raise_Current_Excep (E);
982 --------------------------------------
983 -- Calls to Run-Time Check Routines --
984 --------------------------------------
986 procedure Rcheck_00 (File : System.Address; Line : Integer) is
988 Raise_Constraint_Error_Msg (File, Line, Rmsg_00'Address);
991 procedure Rcheck_01 (File : System.Address; Line : Integer) is
993 Raise_Constraint_Error_Msg (File, Line, Rmsg_01'Address);
996 procedure Rcheck_02 (File : System.Address; Line : Integer) is
998 Raise_Constraint_Error_Msg (File, Line, Rmsg_02'Address);
1001 procedure Rcheck_03 (File : System.Address; Line : Integer) is
1003 Raise_Constraint_Error_Msg (File, Line, Rmsg_03'Address);
1006 procedure Rcheck_04 (File : System.Address; Line : Integer) is
1008 Raise_Constraint_Error_Msg (File, Line, Rmsg_04'Address);
1011 procedure Rcheck_05 (File : System.Address; Line : Integer) is
1013 Raise_Constraint_Error_Msg (File, Line, Rmsg_05'Address);
1016 procedure Rcheck_06 (File : System.Address; Line : Integer) is
1018 Raise_Constraint_Error_Msg (File, Line, Rmsg_06'Address);
1021 procedure Rcheck_07 (File : System.Address; Line : Integer) is
1023 Raise_Constraint_Error_Msg (File, Line, Rmsg_07'Address);
1026 procedure Rcheck_08 (File : System.Address; Line : Integer) is
1028 Raise_Constraint_Error_Msg (File, Line, Rmsg_08'Address);
1031 procedure Rcheck_09 (File : System.Address; Line : Integer) is
1033 Raise_Constraint_Error_Msg (File, Line, Rmsg_09'Address);
1036 procedure Rcheck_10 (File : System.Address; Line : Integer) is
1038 Raise_Constraint_Error_Msg (File, Line, Rmsg_10'Address);
1041 procedure Rcheck_11 (File : System.Address; Line : Integer) is
1043 Raise_Constraint_Error_Msg (File, Line, Rmsg_11'Address);
1046 procedure Rcheck_12 (File : System.Address; Line : Integer) is
1048 Raise_Constraint_Error_Msg (File, Line, Rmsg_12'Address);
1051 procedure Rcheck_13 (File : System.Address; Line : Integer) is
1053 Raise_Constraint_Error_Msg (File, Line, Rmsg_13'Address);
1056 procedure Rcheck_14 (File : System.Address; Line : Integer) is
1058 Raise_Program_Error_Msg (File, Line, Rmsg_14'Address);
1061 procedure Rcheck_15 (File : System.Address; Line : Integer) is
1063 Raise_Program_Error_Msg (File, Line, Rmsg_15'Address);
1066 procedure Rcheck_16 (File : System.Address; Line : Integer) is
1068 Raise_Program_Error_Msg (File, Line, Rmsg_16'Address);
1071 procedure Rcheck_17 (File : System.Address; Line : Integer) is
1073 Raise_Program_Error_Msg (File, Line, Rmsg_17'Address);
1076 procedure Rcheck_18 (File : System.Address; Line : Integer) is
1078 Raise_Program_Error_Msg (File, Line, Rmsg_18'Address);
1081 procedure Rcheck_19 (File : System.Address; Line : Integer) is
1083 Raise_Program_Error_Msg (File, Line, Rmsg_19'Address);
1086 procedure Rcheck_20 (File : System.Address; Line : Integer) is
1088 Raise_Program_Error_Msg (File, Line, Rmsg_20'Address);
1091 procedure Rcheck_21 (File : System.Address; Line : Integer) is
1093 Raise_Program_Error_Msg (File, Line, Rmsg_21'Address);
1096 procedure Rcheck_22 (File : System.Address; Line : Integer) is
1098 Raise_Program_Error_Msg (File, Line, Rmsg_22'Address);
1101 procedure Rcheck_23 (File : System.Address; Line : Integer) is
1103 Raise_Program_Error_Msg (File, Line, Rmsg_23'Address);
1106 procedure Rcheck_24 (File : System.Address; Line : Integer) is
1108 Raise_Program_Error_Msg (File, Line, Rmsg_24'Address);
1111 procedure Rcheck_25 (File : System.Address; Line : Integer) is
1113 Raise_Program_Error_Msg (File, Line, Rmsg_25'Address);
1116 procedure Rcheck_26 (File : System.Address; Line : Integer) is
1118 Raise_Program_Error_Msg (File, Line, Rmsg_26'Address);
1121 procedure Rcheck_27 (File : System.Address; Line : Integer) is
1123 Raise_Program_Error_Msg (File, Line, Rmsg_27'Address);
1126 procedure Rcheck_28 (File : System.Address; Line : Integer) is
1128 Raise_Program_Error_Msg (File, Line, Rmsg_28'Address);
1131 procedure Rcheck_29 (File : System.Address; Line : Integer) is
1133 Raise_Program_Error_Msg (File, Line, Rmsg_29'Address);
1136 procedure Rcheck_30 (File : System.Address; Line : Integer) is
1138 Raise_Storage_Error_Msg (File, Line, Rmsg_30'Address);
1141 procedure Rcheck_31 (File : System.Address; Line : Integer) is
1143 Raise_Storage_Error_Msg (File, Line, Rmsg_31'Address);
1146 procedure Rcheck_32 (File : System.Address; Line : Integer) is
1148 Raise_Storage_Error_Msg (File, Line, Rmsg_32'Address);
1151 procedure Rcheck_33 (File : System.Address; Line : Integer) is
1153 Raise_Storage_Error_Msg (File, Line, Rmsg_33'Address);
1160 procedure Reraise is
1161 Excep : constant EOA := Get_Current_Excep.all;
1165 Raise_Current_Excep (Excep.Id);
1168 ------------------------
1169 -- Reraise_Occurrence --
1170 ------------------------
1172 procedure Reraise_Occurrence (X : Exception_Occurrence) is
1174 if X.Id /= null then
1176 Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1177 Raise_Current_Excep (X.Id);
1179 end Reraise_Occurrence;
1181 -------------------------------
1182 -- Reraise_Occurrence_Always --
1183 -------------------------------
1185 procedure Reraise_Occurrence_Always (X : Exception_Occurrence) is
1188 Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1189 Raise_Current_Excep (X.Id);
1190 end Reraise_Occurrence_Always;
1192 ---------------------------------
1193 -- Reraise_Occurrence_No_Defer --
1194 ---------------------------------
1196 procedure Reraise_Occurrence_No_Defer (X : Exception_Occurrence) is
1198 Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1199 Raise_Current_Excep (X.Id);
1200 end Reraise_Occurrence_No_Defer;
1202 ---------------------
1203 -- Save_Occurrence --
1204 ---------------------
1206 procedure Save_Occurrence
1207 (Target : out Exception_Occurrence;
1208 Source : Exception_Occurrence)
1211 Save_Occurrence_No_Private (Target, Source);
1212 end Save_Occurrence;
1214 function Save_Occurrence (Source : Exception_Occurrence) return EOA is
1215 Target : constant EOA := new Exception_Occurrence;
1217 Save_Occurrence (Target.all, Source);
1219 end Save_Occurrence;
1221 --------------------------------
1222 -- Save_Occurrence_No_Private --
1223 --------------------------------
1225 procedure Save_Occurrence_No_Private
1226 (Target : out Exception_Occurrence;
1227 Source : Exception_Occurrence)
1230 Target.Id := Source.Id;
1231 Target.Msg_Length := Source.Msg_Length;
1232 Target.Num_Tracebacks := Source.Num_Tracebacks;
1233 Target.Pid := Source.Pid;
1234 Target.Cleanup_Flag := Source.Cleanup_Flag;
1236 Target.Msg (1 .. Target.Msg_Length) :=
1237 Source.Msg (1 .. Target.Msg_Length);
1239 Target.Tracebacks (1 .. Target.Num_Tracebacks) :=
1240 Source.Tracebacks (1 .. Target.Num_Tracebacks);
1241 end Save_Occurrence_No_Private;
1243 -------------------------
1244 -- Transfer_Occurrence --
1245 -------------------------
1247 procedure Transfer_Occurrence
1248 (Target : Exception_Occurrence_Access;
1249 Source : Exception_Occurrence)
1252 -- Setup Target as an exception to be propagated in the calling task
1253 -- (rendezvous-wise), taking care not to clobber the associated private
1254 -- data. Target is expected to be a pointer to the calling task's
1255 -- fixed TSD occurrence, which is very different from Get_Current_Excep
1256 -- here because this subprogram is called from the called task.
1258 Save_Occurrence_No_Private (Target.all, Source);
1259 end Transfer_Occurrence;
1265 function String_To_EId (S : String) return Exception_Id
1266 renames Stream_Attributes.String_To_EId;
1272 function String_To_EO (S : String) return Exception_Occurrence
1273 renames Stream_Attributes.String_To_EO;
1275 ------------------------------
1276 -- Raise_Exception_No_Defer --
1277 ------------------------------
1279 procedure Raise_Exception_No_Defer
1281 Message : String := "")
1284 Exception_Data.Set_Exception_Msg (E, Message);
1286 -- Do not call Abort_Defer.all, as specified by the spec
1288 Raise_Current_Excep (E);
1289 end Raise_Exception_No_Defer;
1295 procedure To_Stderr (C : Character) is
1297 type int is new Integer;
1299 procedure put_char_stderr (C : int);
1300 pragma Import (C, put_char_stderr, "put_char_stderr");
1303 put_char_stderr (Character'Pos (C));
1306 procedure To_Stderr (S : String) is
1308 for J in S'Range loop
1309 if S (J) /= ASCII.CR then