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.
43 pragma Warnings (Off);
47 pragma Style_Checks (All_Checks);
48 -- No subprogram ordering check, due to logical grouping
51 -- We must turn polling off for this unit, because otherwise we get
52 -- elaboration circularities with System.Exception_Tables.
54 with System; use System;
55 with System.Exceptions; use System.Exceptions;
56 with System.Standard_Library; use System.Standard_Library;
57 with System.Soft_Links; use System.Soft_Links;
59 package body Ada.Exceptions is
61 pragma Suppress (All_Checks);
62 -- We definitely do not want exceptions occurring within this unit, or
63 -- we are in big trouble. If an exceptional situation does occur, better
64 -- that it not be raised, since raising it can cause confusing chaos.
66 -----------------------
67 -- Local Subprograms --
68 -----------------------
70 -- Note: the exported subprograms in this package body are called directly
71 -- from C clients using the given external name, even though they are not
72 -- technically visible in the Ada sense.
74 procedure Process_Raise_Exception (E : Exception_Id);
75 pragma No_Return (Process_Raise_Exception);
76 -- This is the lowest level raise routine. It raises the exception
77 -- referenced by Current_Excep.all in the TSD, without deferring abort
78 -- (the caller must ensure that abort is deferred on entry).
80 procedure To_Stderr (S : String);
81 pragma Export (Ada, To_Stderr, "__gnat_to_stderr");
82 -- Little routine to output string to stderr that is also used
83 -- in the tasking run time.
85 procedure To_Stderr (C : Character);
86 pragma Inline (To_Stderr);
87 pragma Export (Ada, To_Stderr, "__gnat_to_stderr_char");
88 -- Little routine to output a character to stderr, used by some of
89 -- the separate units below.
91 package Exception_Data is
93 ---------------------------------
94 -- Exception messages routines --
95 ---------------------------------
97 procedure Set_Exception_C_Msg
99 Msg1 : System.Address;
101 Msg2 : System.Address := System.Null_Address);
102 -- This routine is called to setup the exception referenced by the
103 -- Current_Excep field in the TSD to contain the indicated Id value
104 -- and message. Msg1 is a null terminated string which is generated
105 -- as the exception message. If line is non-zero, then a colon and
106 -- the decimal representation of this integer is appended to the
107 -- message. When Msg2 is non-null, a space and this additional null
108 -- terminated string is added to the message.
110 procedure Set_Exception_Msg
113 -- This routine is called to setup the exception referenced by the
114 -- Current_Excep field in the TSD to contain the indicated Id value
115 -- and message. Message is a string which is generated as the
116 -- exception message.
118 --------------------------------------
119 -- Exception information subprogram --
120 --------------------------------------
122 function Exception_Information (X : Exception_Occurrence) return String;
123 -- The format of the exception information is as follows:
125 -- Exception_Name: <exception name> (as in Exception_Name)
126 -- Message: <message> (only if Exception_Message is empty)
127 -- PID=nnnn (only if != 0)
128 -- Call stack traceback locations: (only if at least one location)
129 -- <0xyyyyyyyy 0xyyyyyyyy ...> (is recorded)
131 -- The lines are separated by a ASCII.LF character.
132 -- The nnnn is the partition Id given as decimal digits.
133 -- The 0x... line represents traceback program counter locations, in
134 -- execution order with the first one being the exception location. It
137 -- The Exception_Name and Message lines are omitted in the abort
138 -- signal case, since this is not really an exception.
140 -- !! If the format of the generated string is changed, please note
141 -- !! that an equivalent modification to the routine String_To_EO must
142 -- !! be made to preserve proper functioning of the stream attributes.
144 ---------------------------------------
145 -- Exception backtracing subprograms --
146 ---------------------------------------
148 -- What is automatically output when exception tracing is on is the
149 -- usual exception information with the call chain backtrace possibly
150 -- tailored by a backtrace decorator. Modifying Exception_Information
151 -- itself is not a good idea because the decorated output is completely
152 -- out of control and would break all our code related to the streaming
153 -- of exceptions. We then provide an alternative function to compute
154 -- the possibly tailored output, which is equivalent if no decorator is
157 function Tailored_Exception_Information
158 (X : Exception_Occurrence) return String;
159 -- Exception information to be output in the case of automatic tracing
160 -- requested through GNAT.Exception_Traces.
162 -- This is the same as Exception_Information if no backtrace decorator
163 -- is currently in place. Otherwise, this is Exception_Information with
164 -- the call chain raw addresses replaced by the result of a call to the
165 -- current decorator provided with the call chain addresses.
168 (Ada, Tailored_Exception_Information,
169 "__gnat_tailored_exception_information");
170 -- This is currently used by System.Tasking.Stages
174 package Exception_Traces is
177 -- Imports Tailored_Exception_Information
179 ----------------------------------------------
180 -- Run-Time Exception Notification Routines --
181 ----------------------------------------------
183 -- These subprograms provide a common run-time interface to trigger the
184 -- actions required when an exception is about to be propagated (e.g.
185 -- user specified actions or output of exception information). They are
186 -- exported to be usable by the Ada exception handling personality
187 -- routine when the GCC 3 mechanism is used.
189 procedure Notify_Handled_Exception;
191 (C, Notify_Handled_Exception, "__gnat_notify_handled_exception");
192 -- This routine is called for a handled occurrence is about to be
195 procedure Notify_Unhandled_Exception;
197 (C, Notify_Unhandled_Exception, "__gnat_notify_unhandled_exception");
198 -- This routine is called when an unhandled occurrence is about to be
201 procedure Unhandled_Exception_Terminate;
202 pragma No_Return (Unhandled_Exception_Terminate);
203 -- This procedure is called to terminate execution following an
204 -- unhandled exception. The exception information, including
205 -- traceback if available is output, and execution is then
206 -- terminated. Note that at the point where this routine is
207 -- called, the stack has typically been destroyed.
209 end Exception_Traces;
211 package Exception_Propagation is
213 procedure Setup_Exception
216 Reraised : Boolean := False);
217 -- Dummy routine used to share a-exexda.adb, do nothing
219 end Exception_Propagation;
221 package Stream_Attributes is
223 --------------------------------
224 -- Stream attributes routines --
225 --------------------------------
227 function EId_To_String (X : Exception_Id) return String;
228 function String_To_EId (S : String) return Exception_Id;
229 -- Functions for implementing Exception_Id stream attributes
231 function EO_To_String (X : Exception_Occurrence) return String;
232 function String_To_EO (S : String) return Exception_Occurrence;
233 -- Functions for implementing Exception_Occurrence stream
236 end Stream_Attributes;
238 procedure Raise_Current_Excep (E : Exception_Id);
239 pragma No_Return (Raise_Current_Excep);
240 pragma Export (C, Raise_Current_Excep, "__gnat_raise_nodefer_with_msg");
241 -- This is a simple wrapper to Process_Raise_Exception.
243 -- This external name for Raise_Current_Excep is historical, and probably
244 -- should be changed but for now we keep it, because gdb and gigi know
247 procedure Raise_Exception_No_Defer
248 (E : Exception_Id; Message : String := "");
250 (Ada, Raise_Exception_No_Defer,
251 "ada__exceptions__raise_exception_no_defer");
252 pragma No_Return (Raise_Exception_No_Defer);
253 -- Similar to Raise_Exception, but with no abort deferral
255 procedure Raise_With_Msg (E : Exception_Id);
256 pragma No_Return (Raise_With_Msg);
257 pragma Export (C, Raise_With_Msg, "__gnat_raise_with_msg");
258 -- Raises an exception with given exception id value. A message
259 -- is associated with the raise, and has already been stored in the
260 -- exception occurrence referenced by the Current_Excep in the TSD.
261 -- Abort is deferred before the raise call.
263 procedure Raise_With_Location_And_Msg
267 M : System.Address := System.Null_Address);
268 pragma No_Return (Raise_With_Location_And_Msg);
269 -- Raise an exception with given exception id value. A filename and line
270 -- number is associated with the raise and is stored in the exception
271 -- occurrence and in addition a string message M is appended to
272 -- this (if M is not null).
274 procedure Raise_Constraint_Error
275 (File : System.Address;
277 pragma No_Return (Raise_Constraint_Error);
279 (C, Raise_Constraint_Error, "__gnat_raise_constraint_error");
280 -- Raise constraint error with file:line information
282 procedure Raise_Constraint_Error_Msg
283 (File : System.Address;
285 Msg : System.Address);
286 pragma No_Return (Raise_Constraint_Error_Msg);
288 (C, Raise_Constraint_Error_Msg, "__gnat_raise_constraint_error_msg");
289 -- Raise constraint error with file:line + msg information
291 procedure Raise_Program_Error
292 (File : System.Address;
294 pragma No_Return (Raise_Program_Error);
296 (C, Raise_Program_Error, "__gnat_raise_program_error");
297 -- Raise program error with file:line information
299 procedure Raise_Program_Error_Msg
300 (File : System.Address;
302 Msg : System.Address);
303 pragma No_Return (Raise_Program_Error_Msg);
305 (C, Raise_Program_Error_Msg, "__gnat_raise_program_error_msg");
306 -- Raise program error with file:line + msg information
308 procedure Raise_Storage_Error
309 (File : System.Address;
311 pragma No_Return (Raise_Storage_Error);
313 (C, Raise_Storage_Error, "__gnat_raise_storage_error");
314 -- Raise storage error with file:line information
316 procedure Raise_Storage_Error_Msg
317 (File : System.Address;
319 Msg : System.Address);
320 pragma No_Return (Raise_Storage_Error_Msg);
322 (C, Raise_Storage_Error_Msg, "__gnat_raise_storage_error_msg");
323 -- Raise storage error with file:line + reason msg information
325 -- The exception raising process and the automatic tracing mechanism rely
326 -- on some careful use of flags attached to the exception occurrence. The
327 -- graph below illustrates the relations between the Raise_ subprograms
328 -- and identifies the points where basic flags such as Exception_Raised
331 -- (i) signs indicate the flags initialization points. R stands for Raise,
332 -- W for With, and E for Exception.
334 -- R_No_Msg R_E R_Pe R_Ce R_Se
336 -- +--+ +--+ +---+ | +---+
338 -- R_E_No_Defer(i) R_W_Msg(i) R_W_Loc
340 -- +------------+ | +-----------+ +--+
342 -- | | | Set_E_C_Msg(i)
344 -- Raise_Current_Excep
347 pragma No_Return (Reraise);
348 pragma Export (C, Reraise, "__gnat_reraise");
349 -- Reraises the exception referenced by the Current_Excep field of
350 -- the TSD (all fields of this exception occurrence are set). Abort
351 -- is deferred before the reraise operation.
353 -- Save_Occurrence variations: As the management of the private data
354 -- attached to occurrences is delicate, whether or not pointers to such
355 -- data has to be copied in various situations is better made explicit.
356 -- The following procedures provide an internal interface to help making
359 procedure Save_Occurrence_No_Private
360 (Target : out Exception_Occurrence;
361 Source : Exception_Occurrence);
362 -- Copy all the components of Source to Target, except the
363 -- Private_Data pointer.
365 procedure Transfer_Occurrence
366 (Target : Exception_Occurrence_Access;
367 Source : Exception_Occurrence);
368 pragma Export (C, Transfer_Occurrence, "__gnat_transfer_occurrence");
369 -- Called from System.Tasking.RendezVous.Exceptional_Complete_RendezVous
370 -- to setup Target from Source as an exception to be propagated in the
371 -- caller task. Target is expected to be a pointer to the fixed TSD
372 -- occurrence for this task.
374 -----------------------------
375 -- Run-Time Check Routines --
376 -----------------------------
378 -- These routines raise a specific exception with a reason message
379 -- attached. The parameters are the file name and line number in each
380 -- case. The names are keyed to the codes defined in types.ads and
381 -- a-types.h (for example, the name Rcheck_05 refers to the Reason
382 -- RT_Exception_Code'Val (5)).
384 procedure Rcheck_00 (File : System.Address; Line : Integer);
385 procedure Rcheck_01 (File : System.Address; Line : Integer);
386 procedure Rcheck_02 (File : System.Address; Line : Integer);
387 procedure Rcheck_03 (File : System.Address; Line : Integer);
388 procedure Rcheck_04 (File : System.Address; Line : Integer);
389 procedure Rcheck_05 (File : System.Address; Line : Integer);
390 procedure Rcheck_06 (File : System.Address; Line : Integer);
391 procedure Rcheck_07 (File : System.Address; Line : Integer);
392 procedure Rcheck_08 (File : System.Address; Line : Integer);
393 procedure Rcheck_09 (File : System.Address; Line : Integer);
394 procedure Rcheck_10 (File : System.Address; Line : Integer);
395 procedure Rcheck_11 (File : System.Address; Line : Integer);
396 procedure Rcheck_12 (File : System.Address; Line : Integer);
397 procedure Rcheck_13 (File : System.Address; Line : Integer);
398 procedure Rcheck_14 (File : System.Address; Line : Integer);
399 procedure Rcheck_15 (File : System.Address; Line : Integer);
400 procedure Rcheck_16 (File : System.Address; Line : Integer);
401 procedure Rcheck_17 (File : System.Address; Line : Integer);
402 procedure Rcheck_18 (File : System.Address; Line : Integer);
403 procedure Rcheck_19 (File : System.Address; Line : Integer);
404 procedure Rcheck_20 (File : System.Address; Line : Integer);
405 procedure Rcheck_21 (File : System.Address; Line : Integer);
406 procedure Rcheck_22 (File : System.Address; Line : Integer);
407 procedure Rcheck_23 (File : System.Address; Line : Integer);
408 procedure Rcheck_24 (File : System.Address; Line : Integer);
409 procedure Rcheck_25 (File : System.Address; Line : Integer);
410 procedure Rcheck_26 (File : System.Address; Line : Integer);
411 procedure Rcheck_27 (File : System.Address; Line : Integer);
412 procedure Rcheck_28 (File : System.Address; Line : Integer);
413 procedure Rcheck_29 (File : System.Address; Line : Integer);
414 procedure Rcheck_30 (File : System.Address; Line : Integer);
415 procedure Rcheck_31 (File : System.Address; Line : Integer);
416 procedure Rcheck_32 (File : System.Address; Line : Integer);
418 pragma Export (C, Rcheck_00, "__gnat_rcheck_00");
419 pragma Export (C, Rcheck_01, "__gnat_rcheck_01");
420 pragma Export (C, Rcheck_02, "__gnat_rcheck_02");
421 pragma Export (C, Rcheck_03, "__gnat_rcheck_03");
422 pragma Export (C, Rcheck_04, "__gnat_rcheck_04");
423 pragma Export (C, Rcheck_05, "__gnat_rcheck_05");
424 pragma Export (C, Rcheck_06, "__gnat_rcheck_06");
425 pragma Export (C, Rcheck_07, "__gnat_rcheck_07");
426 pragma Export (C, Rcheck_08, "__gnat_rcheck_08");
427 pragma Export (C, Rcheck_09, "__gnat_rcheck_09");
428 pragma Export (C, Rcheck_10, "__gnat_rcheck_10");
429 pragma Export (C, Rcheck_11, "__gnat_rcheck_11");
430 pragma Export (C, Rcheck_12, "__gnat_rcheck_12");
431 pragma Export (C, Rcheck_13, "__gnat_rcheck_13");
432 pragma Export (C, Rcheck_14, "__gnat_rcheck_14");
433 pragma Export (C, Rcheck_15, "__gnat_rcheck_15");
434 pragma Export (C, Rcheck_16, "__gnat_rcheck_16");
435 pragma Export (C, Rcheck_17, "__gnat_rcheck_17");
436 pragma Export (C, Rcheck_18, "__gnat_rcheck_18");
437 pragma Export (C, Rcheck_19, "__gnat_rcheck_19");
438 pragma Export (C, Rcheck_20, "__gnat_rcheck_20");
439 pragma Export (C, Rcheck_21, "__gnat_rcheck_21");
440 pragma Export (C, Rcheck_22, "__gnat_rcheck_22");
441 pragma Export (C, Rcheck_23, "__gnat_rcheck_23");
442 pragma Export (C, Rcheck_24, "__gnat_rcheck_24");
443 pragma Export (C, Rcheck_25, "__gnat_rcheck_25");
444 pragma Export (C, Rcheck_26, "__gnat_rcheck_26");
445 pragma Export (C, Rcheck_27, "__gnat_rcheck_27");
446 pragma Export (C, Rcheck_28, "__gnat_rcheck_28");
447 pragma Export (C, Rcheck_29, "__gnat_rcheck_29");
448 pragma Export (C, Rcheck_30, "__gnat_rcheck_30");
449 pragma Export (C, Rcheck_31, "__gnat_rcheck_31");
450 pragma Export (C, Rcheck_32, "__gnat_rcheck_32");
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);
489 ---------------------------------------------
490 -- Reason Strings for Run-Time Check Calls --
491 ---------------------------------------------
493 -- These strings are null-terminated and are used by Rcheck_nn. The
494 -- strings correspond to the definitions for Types.RT_Exception_Code.
498 Rmsg_00 : constant String := "access check failed" & NUL;
499 Rmsg_01 : constant String := "access parameter is null" & NUL;
500 Rmsg_02 : constant String := "discriminant check failed" & NUL;
501 Rmsg_03 : constant String := "divide by zero" & NUL;
502 Rmsg_04 : constant String := "explicit raise" & NUL;
503 Rmsg_05 : constant String := "index check failed" & NUL;
504 Rmsg_06 : constant String := "invalid data" & NUL;
505 Rmsg_07 : constant String := "length check failed" & NUL;
506 Rmsg_08 : constant String := "null Exception_Id" & NUL;
507 Rmsg_09 : constant String := "null-exclusion check failed" & NUL;
508 Rmsg_10 : constant String := "overflow check failed" & NUL;
509 Rmsg_11 : constant String := "partition check failed" & NUL;
510 Rmsg_12 : constant String := "range check failed" & NUL;
511 Rmsg_13 : constant String := "tag check failed" & NUL;
512 Rmsg_14 : constant String := "access before elaboration" & NUL;
513 Rmsg_15 : constant String := "accessibility check failed" & NUL;
514 Rmsg_16 : constant String := "all guards closed" & NUL;
515 Rmsg_17 : constant String := "Current_Task referenced in entry" &
517 Rmsg_18 : constant String := "duplicated entry address" & NUL;
518 Rmsg_19 : constant String := "explicit raise" & NUL;
519 Rmsg_20 : constant String := "finalize/adjust raised exception" & NUL;
520 Rmsg_21 : constant String := "implicit return with No_Return" & NUL;
521 Rmsg_22 : constant String := "misaligned address value" & NUL;
522 Rmsg_23 : constant String := "missing return" & NUL;
523 Rmsg_24 : constant String := "overlaid controlled object" & NUL;
524 Rmsg_25 : constant String := "potentially blocking operation" & NUL;
525 Rmsg_26 : constant String := "stubbed subprogram called" & NUL;
526 Rmsg_27 : constant String := "unchecked union restriction" & NUL;
527 Rmsg_28 : constant String := "actual/returned class-wide value "
528 & "not transportable" & NUL;
529 Rmsg_29 : constant String := "empty storage pool" & NUL;
530 Rmsg_30 : constant String := "explicit raise" & NUL;
531 Rmsg_31 : constant String := "infinite recursion" & NUL;
532 Rmsg_32 : constant String := "object too large" & NUL;
534 -----------------------
535 -- Polling Interface --
536 -----------------------
538 type Unsigned is mod 2 ** 32;
540 Counter : Unsigned := 0;
541 pragma Warnings (Off, Counter);
542 -- This counter is provided for convenience. It can be used in Poll to
543 -- perform periodic but not systematic operations.
545 procedure Poll is separate;
546 -- The actual polling routine is separate, so that it can easily
547 -- be replaced with a target dependent version.
549 ------------------------------
550 -- Current_Target_Exception --
551 ------------------------------
553 function Current_Target_Exception return Exception_Occurrence is
555 return Null_Occurrence;
556 end Current_Target_Exception;
562 function EId_To_String (X : Exception_Id) return String
563 renames Stream_Attributes.EId_To_String;
569 -- We use the null string to represent the null occurrence, otherwise
570 -- we output the Exception_Information string for the occurrence.
572 function EO_To_String (X : Exception_Occurrence) return String
573 renames Stream_Attributes.EO_To_String;
575 ------------------------
576 -- Exception_Identity --
577 ------------------------
579 function Exception_Identity
580 (X : Exception_Occurrence) return Exception_Id
583 -- Note that the following test used to be here for the original
584 -- Ada 95 semantics, but these were modified by AI-241 to require
585 -- returning Null_Id instead of raising Constraint_Error.
587 -- if X.Id = Null_Id then
588 -- raise Constraint_Error;
592 end Exception_Identity;
594 ---------------------------
595 -- Exception_Information --
596 ---------------------------
598 function Exception_Information (X : Exception_Occurrence) return String is
600 if X.Id = Null_Id then
601 raise Constraint_Error;
604 return Exception_Data.Exception_Information (X);
605 end Exception_Information;
607 -----------------------
608 -- Exception_Message --
609 -----------------------
611 function Exception_Message (X : Exception_Occurrence) return String is
613 if X.Id = Null_Id then
614 raise Constraint_Error;
617 return X.Msg (1 .. X.Msg_Length);
618 end Exception_Message;
624 function Exception_Name (Id : Exception_Id) return String is
627 raise Constraint_Error;
630 return To_Ptr (Id.Full_Name) (1 .. Id.Name_Length - 1);
633 function Exception_Name (X : Exception_Occurrence) return String is
635 return Exception_Name (X.Id);
638 ---------------------------
639 -- Exception_Name_Simple --
640 ---------------------------
642 function Exception_Name_Simple (X : Exception_Occurrence) return String is
643 Name : constant String := Exception_Name (X);
649 exit when Name (P - 1) = '.';
653 -- Return result making sure lower bound is 1
656 subtype Rname is String (1 .. Name'Length - P + 1);
658 return Rname (Name (P .. Name'Length));
660 end Exception_Name_Simple;
666 package body Exception_Data is separate;
667 -- This package can be easily dummied out if we do not want the
668 -- basic support for exception messages (such as in Ada 83).
670 package body Exception_Propagation is
672 procedure Setup_Exception
675 Reraised : Boolean := False)
677 pragma Warnings (Off, Excep);
678 pragma Warnings (Off, Current);
679 pragma Warnings (Off, Reraised);
684 end Exception_Propagation;
686 ----------------------
687 -- Exception_Traces --
688 ----------------------
690 package body Exception_Traces is separate;
691 -- Depending on the underlying support for IO the implementation
692 -- will differ. Moreover we would like to dummy out this package
693 -- in case we do not want any exception tracing support. This is
694 -- why this package is separated.
696 -----------------------
697 -- Stream Attributes --
698 -----------------------
700 package body Stream_Attributes is separate;
701 -- This package can be easily dummied out if we do not want the
702 -- support for streaming Exception_Ids and Exception_Occurrences.
704 -----------------------------
705 -- Process_Raise_Exception --
706 -----------------------------
708 procedure Process_Raise_Exception (E : Exception_Id) is
709 pragma Inspection_Point (E);
710 -- This is so the debugger can reliably inspect the parameter
712 Jumpbuf_Ptr : constant Address := Get_Jmpbuf_Address.all;
713 Excep : constant EOA := Get_Current_Excep.all;
715 procedure builtin_longjmp (buffer : Address; Flag : Integer);
716 pragma No_Return (builtin_longjmp);
717 pragma Import (C, builtin_longjmp, "_gnat_builtin_longjmp");
720 -- WARNING: There should be no exception handler for this body
721 -- because this would cause gigi to prepend a setup for a new
722 -- jmpbuf to the sequence of statements in case of built-in sjljl.
723 -- We would then always get this new buf in Jumpbuf_Ptr instead of the
724 -- one for the exception we are handling, which would completely break
725 -- the whole design of this procedure.
727 -- If the jump buffer pointer is non-null, transfer control using
728 -- it. Otherwise announce an unhandled exception (note that this
729 -- means that we have no finalizations to do other than at the outer
730 -- level). Perform the necessary notification tasks in both cases.
732 if Jumpbuf_Ptr /= Null_Address then
733 if not Excep.Exception_Raised then
734 Excep.Exception_Raised := True;
735 Exception_Traces.Notify_Handled_Exception;
738 builtin_longjmp (Jumpbuf_Ptr, 1);
741 Exception_Traces.Notify_Unhandled_Exception;
742 Exception_Traces.Unhandled_Exception_Terminate;
744 end Process_Raise_Exception;
746 ----------------------------
747 -- Raise_Constraint_Error --
748 ----------------------------
750 procedure Raise_Constraint_Error
751 (File : System.Address;
755 Raise_With_Location_And_Msg
756 (Constraint_Error_Def'Access, File, Line);
757 end Raise_Constraint_Error;
759 --------------------------------
760 -- Raise_Constraint_Error_Msg --
761 --------------------------------
763 procedure Raise_Constraint_Error_Msg
764 (File : System.Address;
766 Msg : System.Address)
769 Raise_With_Location_And_Msg
770 (Constraint_Error_Def'Access, File, Line, Msg);
771 end Raise_Constraint_Error_Msg;
773 -------------------------
774 -- Raise_Current_Excep --
775 -------------------------
777 procedure Raise_Current_Excep (E : Exception_Id) is
779 pragma Inspection_Point (E);
780 -- This is so the debugger can reliably inspect the parameter when
781 -- inserting a breakpoint at the start of this procedure.
783 Id : Exception_Id := E;
784 pragma Volatile (Id);
785 pragma Warnings (Off, Id);
786 -- In order to provide support for breakpoints on unhandled exceptions,
787 -- the debugger will also need to be able to inspect the value of E from
788 -- another (inner) frame. So we need to make sure that if E is passed in
789 -- a register, its value is also spilled on stack. For this, we store
790 -- the parameter value in a local variable, and add a pragma Volatile to
791 -- make sure it is spilled. The pragma Warnings (Off) is needed because
792 -- the compiler knows that Id is not referenced and that this use of
793 -- pragma Volatile is peculiar!
796 Debug_Raise_Exception (E => SSL.Exception_Data_Ptr (E));
797 Process_Raise_Exception (E);
798 end Raise_Current_Excep;
800 ---------------------
801 -- Raise_Exception --
802 ---------------------
804 procedure Raise_Exception
806 Message : String := "")
808 EF : Exception_Id := E;
811 -- Raise CE if E = Null_ID (AI-446)
814 EF := Constraint_Error'Identity;
817 -- Go ahead and raise appropriate exception
819 Exception_Data.Set_Exception_Msg (EF, Message);
821 Raise_Current_Excep (EF);
824 ----------------------------
825 -- Raise_Exception_Always --
826 ----------------------------
828 procedure Raise_Exception_Always
830 Message : String := "")
833 Exception_Data.Set_Exception_Msg (E, Message);
835 Raise_Current_Excep (E);
836 end Raise_Exception_Always;
838 -------------------------------------
839 -- Raise_From_Controlled_Operation --
840 -------------------------------------
842 procedure Raise_From_Controlled_Operation
843 (X : Ada.Exceptions.Exception_Occurrence)
845 Prefix : constant String := "adjust/finalize raised ";
846 Orig_Msg : constant String := Exception_Message (X);
847 New_Msg : constant String := Prefix & Exception_Name (X);
850 if Orig_Msg'Length >= Prefix'Length
852 Orig_Msg (Orig_Msg'First .. Orig_Msg'First + Prefix'Length - 1) =
855 -- Message already has proper prefix, just re-reraise PROGRAM_ERROR
857 Raise_Exception_No_Defer
858 (E => Program_Error'Identity,
859 Message => Orig_Msg);
861 elsif Orig_Msg = "" then
863 -- No message present: just provide our own
865 Raise_Exception_No_Defer
866 (E => Program_Error'Identity,
870 -- Message present, add informational prefix
872 Raise_Exception_No_Defer
873 (E => Program_Error'Identity,
874 Message => New_Msg & ": " & Orig_Msg);
876 end Raise_From_Controlled_Operation;
878 -------------------------------
879 -- Raise_From_Signal_Handler --
880 -------------------------------
882 procedure Raise_From_Signal_Handler
887 Exception_Data.Set_Exception_C_Msg (E, M);
889 Process_Raise_Exception (E);
890 end Raise_From_Signal_Handler;
892 -------------------------
893 -- Raise_Program_Error --
894 -------------------------
896 procedure Raise_Program_Error
897 (File : System.Address;
901 Raise_With_Location_And_Msg
902 (Program_Error_Def'Access, File, Line);
903 end Raise_Program_Error;
905 -----------------------------
906 -- Raise_Program_Error_Msg --
907 -----------------------------
909 procedure Raise_Program_Error_Msg
910 (File : System.Address;
912 Msg : System.Address)
915 Raise_With_Location_And_Msg
916 (Program_Error_Def'Access, File, Line, Msg);
917 end Raise_Program_Error_Msg;
919 -------------------------
920 -- Raise_Storage_Error --
921 -------------------------
923 procedure Raise_Storage_Error
924 (File : System.Address;
928 Raise_With_Location_And_Msg
929 (Storage_Error_Def'Access, File, Line);
930 end Raise_Storage_Error;
932 -----------------------------
933 -- Raise_Storage_Error_Msg --
934 -----------------------------
936 procedure Raise_Storage_Error_Msg
937 (File : System.Address;
939 Msg : System.Address)
942 Raise_With_Location_And_Msg
943 (Storage_Error_Def'Access, File, Line, Msg);
944 end Raise_Storage_Error_Msg;
946 ---------------------------------
947 -- Raise_With_Location_And_Msg --
948 ---------------------------------
950 procedure Raise_With_Location_And_Msg
954 M : System.Address := System.Null_Address)
957 Exception_Data.Set_Exception_C_Msg (E, F, L, M);
959 Raise_Current_Excep (E);
960 end Raise_With_Location_And_Msg;
966 procedure Raise_With_Msg (E : Exception_Id) is
967 Excep : constant EOA := Get_Current_Excep.all;
970 Excep.Exception_Raised := False;
972 Excep.Num_Tracebacks := 0;
973 Excep.Cleanup_Flag := False;
974 Excep.Pid := Local_Partition_ID;
976 Raise_Current_Excep (E);
979 --------------------------------------
980 -- Calls to Run-Time Check Routines --
981 --------------------------------------
983 procedure Rcheck_00 (File : System.Address; Line : Integer) is
985 Raise_Constraint_Error_Msg (File, Line, Rmsg_00'Address);
988 procedure Rcheck_01 (File : System.Address; Line : Integer) is
990 Raise_Constraint_Error_Msg (File, Line, Rmsg_01'Address);
993 procedure Rcheck_02 (File : System.Address; Line : Integer) is
995 Raise_Constraint_Error_Msg (File, Line, Rmsg_02'Address);
998 procedure Rcheck_03 (File : System.Address; Line : Integer) is
1000 Raise_Constraint_Error_Msg (File, Line, Rmsg_03'Address);
1003 procedure Rcheck_04 (File : System.Address; Line : Integer) is
1005 Raise_Constraint_Error_Msg (File, Line, Rmsg_04'Address);
1008 procedure Rcheck_05 (File : System.Address; Line : Integer) is
1010 Raise_Constraint_Error_Msg (File, Line, Rmsg_05'Address);
1013 procedure Rcheck_06 (File : System.Address; Line : Integer) is
1015 Raise_Constraint_Error_Msg (File, Line, Rmsg_06'Address);
1018 procedure Rcheck_07 (File : System.Address; Line : Integer) is
1020 Raise_Constraint_Error_Msg (File, Line, Rmsg_07'Address);
1023 procedure Rcheck_08 (File : System.Address; Line : Integer) is
1025 Raise_Constraint_Error_Msg (File, Line, Rmsg_08'Address);
1028 procedure Rcheck_09 (File : System.Address; Line : Integer) is
1030 Raise_Constraint_Error_Msg (File, Line, Rmsg_09'Address);
1033 procedure Rcheck_10 (File : System.Address; Line : Integer) is
1035 Raise_Constraint_Error_Msg (File, Line, Rmsg_10'Address);
1038 procedure Rcheck_11 (File : System.Address; Line : Integer) is
1040 Raise_Constraint_Error_Msg (File, Line, Rmsg_11'Address);
1043 procedure Rcheck_12 (File : System.Address; Line : Integer) is
1045 Raise_Constraint_Error_Msg (File, Line, Rmsg_12'Address);
1048 procedure Rcheck_13 (File : System.Address; Line : Integer) is
1050 Raise_Constraint_Error_Msg (File, Line, Rmsg_13'Address);
1053 procedure Rcheck_14 (File : System.Address; Line : Integer) is
1055 Raise_Program_Error_Msg (File, Line, Rmsg_14'Address);
1058 procedure Rcheck_15 (File : System.Address; Line : Integer) is
1060 Raise_Program_Error_Msg (File, Line, Rmsg_15'Address);
1063 procedure Rcheck_16 (File : System.Address; Line : Integer) is
1065 Raise_Program_Error_Msg (File, Line, Rmsg_16'Address);
1068 procedure Rcheck_17 (File : System.Address; Line : Integer) is
1070 Raise_Program_Error_Msg (File, Line, Rmsg_17'Address);
1073 procedure Rcheck_18 (File : System.Address; Line : Integer) is
1075 Raise_Program_Error_Msg (File, Line, Rmsg_18'Address);
1078 procedure Rcheck_19 (File : System.Address; Line : Integer) is
1080 Raise_Program_Error_Msg (File, Line, Rmsg_19'Address);
1083 procedure Rcheck_20 (File : System.Address; Line : Integer) is
1085 Raise_Program_Error_Msg (File, Line, Rmsg_20'Address);
1088 procedure Rcheck_21 (File : System.Address; Line : Integer) is
1090 Raise_Program_Error_Msg (File, Line, Rmsg_21'Address);
1093 procedure Rcheck_22 (File : System.Address; Line : Integer) is
1095 Raise_Program_Error_Msg (File, Line, Rmsg_22'Address);
1098 procedure Rcheck_23 (File : System.Address; Line : Integer) is
1100 Raise_Program_Error_Msg (File, Line, Rmsg_23'Address);
1103 procedure Rcheck_24 (File : System.Address; Line : Integer) is
1105 Raise_Program_Error_Msg (File, Line, Rmsg_24'Address);
1108 procedure Rcheck_25 (File : System.Address; Line : Integer) is
1110 Raise_Program_Error_Msg (File, Line, Rmsg_25'Address);
1113 procedure Rcheck_26 (File : System.Address; Line : Integer) is
1115 Raise_Program_Error_Msg (File, Line, Rmsg_26'Address);
1118 procedure Rcheck_27 (File : System.Address; Line : Integer) is
1120 Raise_Program_Error_Msg (File, Line, Rmsg_27'Address);
1123 procedure Rcheck_28 (File : System.Address; Line : Integer) is
1125 Raise_Program_Error_Msg (File, Line, Rmsg_28'Address);
1128 procedure Rcheck_29 (File : System.Address; Line : Integer) is
1130 Raise_Storage_Error_Msg (File, Line, Rmsg_29'Address);
1133 procedure Rcheck_30 (File : System.Address; Line : Integer) is
1135 Raise_Storage_Error_Msg (File, Line, Rmsg_30'Address);
1138 procedure Rcheck_31 (File : System.Address; Line : Integer) is
1140 Raise_Storage_Error_Msg (File, Line, Rmsg_31'Address);
1143 procedure Rcheck_32 (File : System.Address; Line : Integer) is
1145 Raise_Storage_Error_Msg (File, Line, Rmsg_32'Address);
1152 procedure Reraise is
1153 Excep : constant EOA := Get_Current_Excep.all;
1157 Raise_Current_Excep (Excep.Id);
1160 ------------------------
1161 -- Reraise_Occurrence --
1162 ------------------------
1164 procedure Reraise_Occurrence (X : Exception_Occurrence) is
1166 if X.Id /= null then
1168 Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1169 Raise_Current_Excep (X.Id);
1171 end Reraise_Occurrence;
1173 -------------------------------
1174 -- Reraise_Occurrence_Always --
1175 -------------------------------
1177 procedure Reraise_Occurrence_Always (X : Exception_Occurrence) is
1180 Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1181 Raise_Current_Excep (X.Id);
1182 end Reraise_Occurrence_Always;
1184 ---------------------------------
1185 -- Reraise_Occurrence_No_Defer --
1186 ---------------------------------
1188 procedure Reraise_Occurrence_No_Defer (X : Exception_Occurrence) is
1190 Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1191 Raise_Current_Excep (X.Id);
1192 end Reraise_Occurrence_No_Defer;
1194 ---------------------
1195 -- Save_Occurrence --
1196 ---------------------
1198 procedure Save_Occurrence
1199 (Target : out Exception_Occurrence;
1200 Source : Exception_Occurrence)
1203 Save_Occurrence_No_Private (Target, Source);
1204 end Save_Occurrence;
1206 function Save_Occurrence (Source : Exception_Occurrence) return EOA is
1207 Target : constant EOA := new Exception_Occurrence;
1209 Save_Occurrence (Target.all, Source);
1211 end Save_Occurrence;
1213 --------------------------------
1214 -- Save_Occurrence_No_Private --
1215 --------------------------------
1217 procedure Save_Occurrence_No_Private
1218 (Target : out Exception_Occurrence;
1219 Source : Exception_Occurrence)
1222 Target.Id := Source.Id;
1223 Target.Msg_Length := Source.Msg_Length;
1224 Target.Num_Tracebacks := Source.Num_Tracebacks;
1225 Target.Pid := Source.Pid;
1226 Target.Cleanup_Flag := Source.Cleanup_Flag;
1228 Target.Msg (1 .. Target.Msg_Length) :=
1229 Source.Msg (1 .. Target.Msg_Length);
1231 Target.Tracebacks (1 .. Target.Num_Tracebacks) :=
1232 Source.Tracebacks (1 .. Target.Num_Tracebacks);
1233 end Save_Occurrence_No_Private;
1235 -------------------------
1236 -- Transfer_Occurrence --
1237 -------------------------
1239 procedure Transfer_Occurrence
1240 (Target : Exception_Occurrence_Access;
1241 Source : Exception_Occurrence)
1244 -- Setup Target as an exception to be propagated in the calling task
1245 -- (rendezvous-wise), taking care not to clobber the associated private
1246 -- data. Target is expected to be a pointer to the calling task's
1247 -- fixed TSD occurrence, which is very different from Get_Current_Excep
1248 -- here because this subprogram is called from the called task.
1250 Save_Occurrence_No_Private (Target.all, Source);
1251 end Transfer_Occurrence;
1257 function String_To_EId (S : String) return Exception_Id
1258 renames Stream_Attributes.String_To_EId;
1264 function String_To_EO (S : String) return Exception_Occurrence
1265 renames Stream_Attributes.String_To_EO;
1267 ------------------------------
1268 -- Raise_Exception_No_Defer --
1269 ------------------------------
1271 procedure Raise_Exception_No_Defer
1273 Message : String := "")
1276 Exception_Data.Set_Exception_Msg (E, Message);
1278 -- Do not call Abort_Defer.all, as specified by the spec
1280 Raise_Current_Excep (E);
1281 end Raise_Exception_No_Defer;
1287 procedure To_Stderr (C : Character) is
1289 type int is new Integer;
1291 procedure put_char_stderr (C : int);
1292 pragma Import (C, put_char_stderr, "put_char_stderr");
1295 put_char_stderr (Character'Pos (C));
1298 procedure To_Stderr (S : String) is
1300 for J in S'Range loop
1301 if S (J) /= ASCII.CR then