1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- A D A . E X C E P T I O N S --
9 -- Copyright (C) 1992-2011, 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_Debug; use System.Exceptions_Debug;
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 we
61 -- are in big trouble. If an exceptional situation does occur, better that
62 -- 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 in the
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 the
87 -- 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 Column : Integer := 0;
100 Msg2 : System.Address := System.Null_Address);
101 -- This routine is called to setup the exception referenced by the
102 -- Current_Excep field in the TSD to contain the indicated Id value
103 -- and message. Msg1 is a null terminated string which is generated
104 -- as the exception message. If line is non-zero, then a colon and
105 -- the decimal representation of this integer is appended to the
106 -- message. Ditto for Column. When Msg2 is non-null, a space and this
107 -- additional null terminated string is added to the message.
109 procedure Set_Exception_Msg
112 -- This routine is called to setup the exception referenced by the
113 -- Current_Excep field in the TSD to contain the indicated Id value and
114 -- message. Message is a string which is generated as the exception
117 --------------------------------------
118 -- Exception information subprogram --
119 --------------------------------------
121 function Exception_Information (X : Exception_Occurrence) return String;
122 -- The format of the exception information is as follows:
124 -- Exception_Name: <exception name> (as in Exception_Name)
125 -- Message: <message> (only if Exception_Message is empty)
126 -- PID=nnnn (only if != 0)
127 -- Call stack traceback locations: (only if at least one location)
128 -- <0xyyyyyyyy 0xyyyyyyyy ...> (is recorded)
130 -- The lines are separated by a ASCII.LF character
132 -- The nnnn is the partition Id given as decimal digits
134 -- The 0x... line represents traceback program counter locations, in
135 -- execution order with the first one being the exception location. It
138 -- The Exception_Name and Message lines are omitted in the abort signal
139 -- case, since this is not really an exception.
141 -- Note: If the format of the generated string is changed, please note
142 -- that an equivalent modification to the routine String_To_EO must be
143 -- made to preserve proper functioning of the stream attributes.
145 ---------------------------------------
146 -- Exception backtracing subprograms --
147 ---------------------------------------
149 -- What is automatically output when exception tracing is on is the
150 -- usual exception information with the call chain backtrace possibly
151 -- tailored by a backtrace decorator. Modifying Exception_Information
152 -- itself is not a good idea because the decorated output is completely
153 -- out of control and would break all our code related to the streaming
154 -- of exceptions. We then provide an alternative function to compute
155 -- the possibly tailored output, which is equivalent if no decorator is
158 function Tailored_Exception_Information
159 (X : Exception_Occurrence) return String;
160 -- Exception information to be output in the case of automatic tracing
161 -- requested through GNAT.Exception_Traces.
163 -- This is the same as Exception_Information if no backtrace decorator
164 -- is currently in place. Otherwise, this is Exception_Information with
165 -- the call chain raw addresses replaced by the result of a call to the
166 -- current decorator provided with the call chain addresses.
169 (Ada, Tailored_Exception_Information,
170 "__gnat_tailored_exception_information");
171 -- This is currently used by System.Tasking.Stages
175 package Exception_Traces is
178 -- Imports Tailored_Exception_Information
180 ----------------------------------------------
181 -- Run-Time Exception Notification Routines --
182 ----------------------------------------------
184 -- These subprograms provide a common run-time interface to trigger the
185 -- actions required when an exception is about to be propagated (e.g.
186 -- user specified actions or output of exception information). They are
187 -- exported to be usable by the Ada exception handling personality
188 -- routine when the GCC 3 mechanism is used.
190 procedure Notify_Handled_Exception;
192 (C, Notify_Handled_Exception, "__gnat_notify_handled_exception");
193 -- This routine is called for a handled occurrence is about to be
196 procedure Notify_Unhandled_Exception;
198 (C, Notify_Unhandled_Exception, "__gnat_notify_unhandled_exception");
199 -- This routine is called when an unhandled occurrence is about to be
202 procedure Unhandled_Exception_Terminate;
203 pragma No_Return (Unhandled_Exception_Terminate);
204 -- This procedure is called to terminate program execution following an
205 -- unhandled exception. The exception information, including traceback
206 -- if available is output, and execution is then terminated. Note that
207 -- at the point where this routine is called, the stack has typically
210 end Exception_Traces;
212 package Stream_Attributes is
214 --------------------------------
215 -- Stream attributes routines --
216 --------------------------------
218 function EId_To_String (X : Exception_Id) return String;
219 function String_To_EId (S : String) return Exception_Id;
220 -- Functions for implementing Exception_Id stream attributes
222 function EO_To_String (X : Exception_Occurrence) return String;
223 function String_To_EO (S : String) return Exception_Occurrence;
224 -- Functions for implementing Exception_Occurrence stream
227 end Stream_Attributes;
229 procedure Raise_Current_Excep (E : Exception_Id);
230 pragma No_Return (Raise_Current_Excep);
231 pragma Export (C, Raise_Current_Excep, "__gnat_raise_nodefer_with_msg");
232 -- This is a simple wrapper to Process_Raise_Exception.
234 -- This external name for Raise_Current_Excep is historical, and probably
235 -- should be changed but for now we keep it, because gdb and gigi know
238 procedure Raise_Exception_No_Defer
239 (E : Exception_Id; Message : String := "");
241 (Ada, Raise_Exception_No_Defer,
242 "ada__exceptions__raise_exception_no_defer");
243 pragma No_Return (Raise_Exception_No_Defer);
244 -- Similar to Raise_Exception, but with no abort deferral
246 procedure Raise_With_Msg (E : Exception_Id);
247 pragma No_Return (Raise_With_Msg);
248 pragma Export (C, Raise_With_Msg, "__gnat_raise_with_msg");
249 -- Raises an exception with given exception id value. A message is
250 -- associated with the raise, and has already been stored in the exception
251 -- occurrence referenced by the Current_Excep in the TSD. Abort is deferred
252 -- before the raise call.
254 procedure Raise_With_Location_And_Msg
258 M : System.Address := System.Null_Address);
259 pragma No_Return (Raise_With_Location_And_Msg);
260 -- Raise an exception with given exception id value. A filename and line
261 -- number is associated with the raise and is stored in the exception
262 -- occurrence and in addition a string message M is appended to this
265 procedure Raise_Constraint_Error
266 (File : System.Address;
268 pragma No_Return (Raise_Constraint_Error);
270 (C, Raise_Constraint_Error, "__gnat_raise_constraint_error");
271 -- Raise constraint error with file:line information
273 procedure Raise_Constraint_Error_Msg
274 (File : System.Address;
276 Msg : System.Address);
277 pragma No_Return (Raise_Constraint_Error_Msg);
279 (C, Raise_Constraint_Error_Msg, "__gnat_raise_constraint_error_msg");
280 -- Raise constraint error with file:line + msg information
282 procedure Raise_Program_Error
283 (File : System.Address;
285 pragma No_Return (Raise_Program_Error);
287 (C, Raise_Program_Error, "__gnat_raise_program_error");
288 -- Raise program error with file:line information
290 procedure Raise_Program_Error_Msg
291 (File : System.Address;
293 Msg : System.Address);
294 pragma No_Return (Raise_Program_Error_Msg);
296 (C, Raise_Program_Error_Msg, "__gnat_raise_program_error_msg");
297 -- Raise program error with file:line + msg information
299 procedure Raise_Storage_Error
300 (File : System.Address;
302 pragma No_Return (Raise_Storage_Error);
304 (C, Raise_Storage_Error, "__gnat_raise_storage_error");
305 -- Raise storage error with file:line information
307 procedure Raise_Storage_Error_Msg
308 (File : System.Address;
310 Msg : System.Address);
311 pragma No_Return (Raise_Storage_Error_Msg);
313 (C, Raise_Storage_Error_Msg, "__gnat_raise_storage_error_msg");
314 -- Raise storage error with file:line + reason msg information
316 -- The exception raising process and the automatic tracing mechanism rely
317 -- on some careful use of flags attached to the exception occurrence. The
318 -- graph below illustrates the relations between the Raise_ subprograms
319 -- and identifies the points where basic flags such as Exception_Raised
322 -- (i) signs indicate the flags initialization points. R stands for Raise,
323 -- W for With, and E for Exception.
325 -- R_No_Msg R_E R_Pe R_Ce R_Se
327 -- +--+ +--+ +---+ | +---+
329 -- R_E_No_Defer(i) R_W_Msg(i) R_W_Loc
331 -- +------------+ | +-----------+ +--+
333 -- | | | Set_E_C_Msg(i)
335 -- Raise_Current_Excep
338 pragma No_Return (Reraise);
339 pragma Export (C, Reraise, "__gnat_reraise");
340 -- Reraises the exception referenced by the Current_Excep field of the TSD
341 -- (all fields of this exception occurrence are set). Abort is deferred
342 -- before the reraise operation.
344 procedure Transfer_Occurrence
345 (Target : Exception_Occurrence_Access;
346 Source : Exception_Occurrence);
347 pragma Export (C, Transfer_Occurrence, "__gnat_transfer_occurrence");
348 -- Called from System.Tasking.RendezVous.Exceptional_Complete_RendezVous
349 -- to setup Target from Source as an exception to be propagated in the
350 -- caller task. Target is expected to be a pointer to the fixed TSD
351 -- occurrence for this task.
353 -----------------------------
354 -- Run-Time Check Routines --
355 -----------------------------
357 -- Routines to a specific exception with a reason message attached. The
358 -- parameters are the file name and line number in each case. The names are
359 -- keyed to the codes defined in types.ads and a-types.h (for example, the
360 -- name Rcheck_05 refers to the Reason RT_Exception_Code'Val (5)).
362 procedure Rcheck_00 (File : System.Address; Line : Integer);
363 procedure Rcheck_01 (File : System.Address; Line : Integer);
364 procedure Rcheck_02 (File : System.Address; Line : Integer);
365 procedure Rcheck_03 (File : System.Address; Line : Integer);
366 procedure Rcheck_04 (File : System.Address; Line : Integer);
367 procedure Rcheck_05 (File : System.Address; Line : Integer);
368 procedure Rcheck_06 (File : System.Address; Line : Integer);
369 procedure Rcheck_07 (File : System.Address; Line : Integer);
370 procedure Rcheck_08 (File : System.Address; Line : Integer);
371 procedure Rcheck_09 (File : System.Address; Line : Integer);
372 procedure Rcheck_10 (File : System.Address; Line : Integer);
373 procedure Rcheck_11 (File : System.Address; Line : Integer);
374 procedure Rcheck_12 (File : System.Address; Line : Integer);
375 procedure Rcheck_13 (File : System.Address; Line : Integer);
376 procedure Rcheck_14 (File : System.Address; Line : Integer);
377 procedure Rcheck_15 (File : System.Address; Line : Integer);
378 procedure Rcheck_16 (File : System.Address; Line : Integer);
379 procedure Rcheck_17 (File : System.Address; Line : Integer);
380 procedure Rcheck_18 (File : System.Address; Line : Integer);
381 procedure Rcheck_19 (File : System.Address; Line : Integer);
382 procedure Rcheck_20 (File : System.Address; Line : Integer);
383 procedure Rcheck_21 (File : System.Address; Line : Integer);
384 procedure Rcheck_22 (File : System.Address; Line : Integer);
385 procedure Rcheck_23 (File : System.Address; Line : Integer);
386 procedure Rcheck_24 (File : System.Address; Line : Integer);
387 procedure Rcheck_25 (File : System.Address; Line : Integer);
388 procedure Rcheck_26 (File : System.Address; Line : Integer);
389 procedure Rcheck_27 (File : System.Address; Line : Integer);
390 procedure Rcheck_28 (File : System.Address; Line : Integer);
391 procedure Rcheck_29 (File : System.Address; Line : Integer);
392 procedure Rcheck_30 (File : System.Address; Line : Integer);
393 procedure Rcheck_31 (File : System.Address; Line : Integer);
394 procedure Rcheck_32 (File : System.Address; Line : Integer);
395 procedure Rcheck_33 (File : System.Address; Line : Integer);
396 procedure Rcheck_34 (File : System.Address; Line : Integer);
398 pragma Export (C, Rcheck_00, "__gnat_rcheck_00");
399 pragma Export (C, Rcheck_01, "__gnat_rcheck_01");
400 pragma Export (C, Rcheck_02, "__gnat_rcheck_02");
401 pragma Export (C, Rcheck_03, "__gnat_rcheck_03");
402 pragma Export (C, Rcheck_04, "__gnat_rcheck_04");
403 pragma Export (C, Rcheck_05, "__gnat_rcheck_05");
404 pragma Export (C, Rcheck_06, "__gnat_rcheck_06");
405 pragma Export (C, Rcheck_07, "__gnat_rcheck_07");
406 pragma Export (C, Rcheck_08, "__gnat_rcheck_08");
407 pragma Export (C, Rcheck_09, "__gnat_rcheck_09");
408 pragma Export (C, Rcheck_10, "__gnat_rcheck_10");
409 pragma Export (C, Rcheck_11, "__gnat_rcheck_11");
410 pragma Export (C, Rcheck_12, "__gnat_rcheck_12");
411 pragma Export (C, Rcheck_13, "__gnat_rcheck_13");
412 pragma Export (C, Rcheck_14, "__gnat_rcheck_14");
413 pragma Export (C, Rcheck_15, "__gnat_rcheck_15");
414 pragma Export (C, Rcheck_16, "__gnat_rcheck_16");
415 pragma Export (C, Rcheck_17, "__gnat_rcheck_17");
416 pragma Export (C, Rcheck_18, "__gnat_rcheck_18");
417 pragma Export (C, Rcheck_19, "__gnat_rcheck_19");
418 pragma Export (C, Rcheck_20, "__gnat_rcheck_20");
419 pragma Export (C, Rcheck_21, "__gnat_rcheck_21");
420 pragma Export (C, Rcheck_22, "__gnat_rcheck_22");
421 pragma Export (C, Rcheck_23, "__gnat_rcheck_23");
422 pragma Export (C, Rcheck_24, "__gnat_rcheck_24");
423 pragma Export (C, Rcheck_25, "__gnat_rcheck_25");
424 pragma Export (C, Rcheck_26, "__gnat_rcheck_26");
425 pragma Export (C, Rcheck_27, "__gnat_rcheck_27");
426 pragma Export (C, Rcheck_28, "__gnat_rcheck_28");
427 pragma Export (C, Rcheck_29, "__gnat_rcheck_29");
428 pragma Export (C, Rcheck_30, "__gnat_rcheck_30");
429 pragma Export (C, Rcheck_31, "__gnat_rcheck_31");
430 pragma Export (C, Rcheck_32, "__gnat_rcheck_32");
431 pragma Export (C, Rcheck_33, "__gnat_rcheck_33");
432 pragma Export (C, Rcheck_34, "__gnat_rcheck_34");
434 -- None of these procedures ever returns (they raise an exception!). By
435 -- using pragma No_Return, we ensure that any junk code after the call,
436 -- such as normal return epilog stuff, can be eliminated).
438 pragma No_Return (Rcheck_00);
439 pragma No_Return (Rcheck_01);
440 pragma No_Return (Rcheck_02);
441 pragma No_Return (Rcheck_03);
442 pragma No_Return (Rcheck_04);
443 pragma No_Return (Rcheck_05);
444 pragma No_Return (Rcheck_06);
445 pragma No_Return (Rcheck_07);
446 pragma No_Return (Rcheck_08);
447 pragma No_Return (Rcheck_09);
448 pragma No_Return (Rcheck_10);
449 pragma No_Return (Rcheck_11);
450 pragma No_Return (Rcheck_12);
451 pragma No_Return (Rcheck_13);
452 pragma No_Return (Rcheck_14);
453 pragma No_Return (Rcheck_15);
454 pragma No_Return (Rcheck_16);
455 pragma No_Return (Rcheck_17);
456 pragma No_Return (Rcheck_18);
457 pragma No_Return (Rcheck_19);
458 pragma No_Return (Rcheck_20);
459 pragma No_Return (Rcheck_21);
460 pragma No_Return (Rcheck_22);
461 pragma No_Return (Rcheck_23);
462 pragma No_Return (Rcheck_24);
463 pragma No_Return (Rcheck_25);
464 pragma No_Return (Rcheck_26);
465 pragma No_Return (Rcheck_27);
466 pragma No_Return (Rcheck_28);
467 pragma No_Return (Rcheck_29);
468 pragma No_Return (Rcheck_30);
469 pragma No_Return (Rcheck_32);
470 pragma No_Return (Rcheck_33);
471 pragma No_Return (Rcheck_34);
473 ---------------------------------------------
474 -- Reason Strings for Run-Time Check Calls --
475 ---------------------------------------------
477 -- These strings are null-terminated and are used by Rcheck_nn. The
478 -- strings correspond to the definitions for Types.RT_Exception_Code.
482 Rmsg_00 : constant String := "access check failed" & NUL;
483 Rmsg_01 : constant String := "access parameter is null" & NUL;
484 Rmsg_02 : constant String := "discriminant check failed" & NUL;
485 Rmsg_03 : constant String := "divide by zero" & NUL;
486 Rmsg_04 : constant String := "explicit raise" & NUL;
487 Rmsg_05 : constant String := "index check failed" & NUL;
488 Rmsg_06 : constant String := "invalid data" & NUL;
489 Rmsg_07 : constant String := "length check failed" & NUL;
490 Rmsg_08 : constant String := "null Exception_Id" & NUL;
491 Rmsg_09 : constant String := "null-exclusion check failed" & NUL;
492 Rmsg_10 : constant String := "overflow check failed" & NUL;
493 Rmsg_11 : constant String := "partition check failed" & NUL;
494 Rmsg_12 : constant String := "range check failed" & NUL;
495 Rmsg_13 : constant String := "tag check failed" & NUL;
496 Rmsg_14 : constant String := "access before elaboration" & NUL;
497 Rmsg_15 : constant String := "accessibility check failed" & NUL;
498 Rmsg_16 : constant String := "attempt to take address of" &
499 " intrinsic subprogram" & NUL;
500 Rmsg_17 : constant String := "all guards closed" & NUL;
501 Rmsg_18 : constant String := "improper use of generic subtype" &
502 " with predicate" & NUL;
503 Rmsg_19 : constant String := "Current_Task referenced in entry" &
505 Rmsg_20 : constant String := "duplicated entry address" & NUL;
506 Rmsg_21 : constant String := "explicit raise" & NUL;
507 Rmsg_22 : constant String := "finalize/adjust raised exception" & NUL;
508 Rmsg_23 : constant String := "implicit return with No_Return" & NUL;
509 Rmsg_24 : constant String := "misaligned address value" & NUL;
510 Rmsg_25 : constant String := "missing return" & NUL;
511 Rmsg_26 : constant String := "overlaid controlled object" & NUL;
512 Rmsg_27 : constant String := "potentially blocking operation" & NUL;
513 Rmsg_28 : constant String := "stubbed subprogram called" & NUL;
514 Rmsg_29 : constant String := "unchecked union restriction" & NUL;
515 Rmsg_30 : constant String := "actual/returned class-wide" &
516 " value not transportable" & NUL;
517 Rmsg_31 : constant String := "empty storage pool" & NUL;
518 Rmsg_32 : constant String := "explicit raise" & NUL;
519 Rmsg_33 : constant String := "infinite recursion" & NUL;
520 Rmsg_34 : constant String := "object too large" & NUL;
522 -----------------------
523 -- Polling Interface --
524 -----------------------
526 type Unsigned is mod 2 ** 32;
528 Counter : Unsigned := 0;
529 pragma Warnings (Off, Counter);
530 -- This counter is provided for convenience. It can be used in Poll to
531 -- perform periodic but not systematic operations.
533 procedure Poll is separate;
534 -- The actual polling routine is separate, so that it can easily be
535 -- replaced with a target dependent version.
537 ------------------------------
538 -- Current_Target_Exception --
539 ------------------------------
541 function Current_Target_Exception return Exception_Occurrence is
543 return Null_Occurrence;
544 end Current_Target_Exception;
550 function EId_To_String (X : Exception_Id) return String
551 renames Stream_Attributes.EId_To_String;
557 -- We use the null string to represent the null occurrence, otherwise we
558 -- output the Exception_Information string for the occurrence.
560 function EO_To_String (X : Exception_Occurrence) return String
561 renames Stream_Attributes.EO_To_String;
563 ------------------------
564 -- Exception_Identity --
565 ------------------------
567 function Exception_Identity
568 (X : Exception_Occurrence) return Exception_Id
571 -- Note that the following test used to be here for the original Ada 95
572 -- semantics, but these were modified by AI-241 to require returning
573 -- Null_Id instead of raising Constraint_Error.
575 -- if X.Id = Null_Id then
576 -- raise Constraint_Error;
580 end Exception_Identity;
582 ---------------------------
583 -- Exception_Information --
584 ---------------------------
586 function Exception_Information (X : Exception_Occurrence) return String is
588 if X.Id = Null_Id then
589 raise Constraint_Error;
592 return Exception_Data.Exception_Information (X);
593 end Exception_Information;
595 -----------------------
596 -- Exception_Message --
597 -----------------------
599 function Exception_Message (X : Exception_Occurrence) return String is
601 if X.Id = Null_Id then
602 raise Constraint_Error;
605 return X.Msg (1 .. X.Msg_Length);
606 end Exception_Message;
612 function Exception_Name (Id : Exception_Id) return String is
615 raise Constraint_Error;
618 return To_Ptr (Id.Full_Name) (1 .. Id.Name_Length - 1);
621 function Exception_Name (X : Exception_Occurrence) return String is
623 return Exception_Name (X.Id);
626 ---------------------------
627 -- Exception_Name_Simple --
628 ---------------------------
630 function Exception_Name_Simple (X : Exception_Occurrence) return String is
631 Name : constant String := Exception_Name (X);
637 exit when Name (P - 1) = '.';
641 -- Return result making sure lower bound is 1
644 subtype Rname is String (1 .. Name'Length - P + 1);
646 return Rname (Name (P .. Name'Length));
648 end Exception_Name_Simple;
654 package body Exception_Data is separate;
655 -- This package can be easily dummied out if we do not want the basic
656 -- support for exception messages (such as in Ada 83).
658 ----------------------
659 -- Exception_Traces --
660 ----------------------
662 package body Exception_Traces is separate;
663 -- Depending on the underlying support for IO the implementation will
664 -- differ. Moreover we would like to dummy out this package in case we do
665 -- not want any exception tracing support. This is why this package is
668 -----------------------
669 -- Stream Attributes --
670 -----------------------
672 package body Stream_Attributes is separate;
673 -- This package can be easily dummied out if we do not want the
674 -- support for streaming Exception_Ids and Exception_Occurrences.
676 -----------------------------
677 -- Process_Raise_Exception --
678 -----------------------------
680 procedure Process_Raise_Exception (E : Exception_Id) is
681 pragma Inspection_Point (E);
682 -- This is so the debugger can reliably inspect the parameter
684 Jumpbuf_Ptr : constant Address := Get_Jmpbuf_Address.all;
685 Excep : constant EOA := Get_Current_Excep.all;
687 procedure builtin_longjmp (buffer : Address; Flag : Integer);
688 pragma No_Return (builtin_longjmp);
689 pragma Import (C, builtin_longjmp, "_gnat_builtin_longjmp");
692 -- WARNING: There should be no exception handler for this body because
693 -- this would cause gigi to prepend a setup for a new jmpbuf to the
694 -- sequence of statements in case of built-in sjljl. We would then
695 -- always get this new buf in Jumpbuf_Ptr instead of the one for the
696 -- exception we are handling, which would completely break the whole
697 -- design of this procedure.
699 -- If the jump buffer pointer is non-null, transfer control using it.
700 -- Otherwise announce an unhandled exception (note that this means that
701 -- we have no finalizations to do other than at the outer level).
702 -- Perform the necessary notification tasks in both cases.
704 if Jumpbuf_Ptr /= Null_Address then
705 if not Excep.Exception_Raised then
706 Excep.Exception_Raised := True;
707 Exception_Traces.Notify_Handled_Exception;
710 builtin_longjmp (Jumpbuf_Ptr, 1);
713 Exception_Traces.Notify_Unhandled_Exception;
714 Exception_Traces.Unhandled_Exception_Terminate;
716 end Process_Raise_Exception;
718 ----------------------------
719 -- Raise_Constraint_Error --
720 ----------------------------
722 procedure Raise_Constraint_Error
723 (File : System.Address;
727 Raise_With_Location_And_Msg
728 (Constraint_Error_Def'Access, File, Line);
729 end Raise_Constraint_Error;
731 --------------------------------
732 -- Raise_Constraint_Error_Msg --
733 --------------------------------
735 procedure Raise_Constraint_Error_Msg
736 (File : System.Address;
738 Msg : System.Address)
741 Raise_With_Location_And_Msg
742 (Constraint_Error_Def'Access, File, Line, Msg);
743 end Raise_Constraint_Error_Msg;
745 -------------------------
746 -- Raise_Current_Excep --
747 -------------------------
749 procedure Raise_Current_Excep (E : Exception_Id) is
751 pragma Inspection_Point (E);
752 -- This is so the debugger can reliably inspect the parameter when
753 -- inserting a breakpoint at the start of this procedure.
755 Id : Exception_Id := E;
756 pragma Volatile (Id);
757 pragma Warnings (Off, Id);
758 -- In order to provide support for breakpoints on unhandled exceptions,
759 -- the debugger will also need to be able to inspect the value of E from
760 -- another (inner) frame. So we need to make sure that if E is passed in
761 -- a register, its value is also spilled on stack. For this, we store
762 -- the parameter value in a local variable, and add a pragma Volatile to
763 -- make sure it is spilled. The pragma Warnings (Off) is needed because
764 -- the compiler knows that Id is not referenced and that this use of
765 -- pragma Volatile is peculiar!
768 Debug_Raise_Exception (E => SSL.Exception_Data_Ptr (E));
769 Process_Raise_Exception (E);
770 end Raise_Current_Excep;
772 ---------------------
773 -- Raise_Exception --
774 ---------------------
776 procedure Raise_Exception
778 Message : String := "")
780 EF : Exception_Id := E;
783 -- Raise CE if E = Null_ID (AI-446)
786 EF := Constraint_Error'Identity;
789 -- Go ahead and raise appropriate exception
791 Exception_Data.Set_Exception_Msg (EF, Message);
793 Raise_Current_Excep (EF);
796 ----------------------------
797 -- Raise_Exception_Always --
798 ----------------------------
800 procedure Raise_Exception_Always
802 Message : String := "")
805 Exception_Data.Set_Exception_Msg (E, Message);
807 Raise_Current_Excep (E);
808 end Raise_Exception_Always;
810 ------------------------------
811 -- Raise_Exception_No_Defer --
812 ------------------------------
814 procedure Raise_Exception_No_Defer
816 Message : String := "")
819 Exception_Data.Set_Exception_Msg (E, Message);
821 -- Do not call Abort_Defer.all, as specified by the spec
823 Raise_Current_Excep (E);
824 end Raise_Exception_No_Defer;
826 -------------------------------------
827 -- Raise_From_Controlled_Operation --
828 -------------------------------------
830 procedure Raise_From_Controlled_Operation
831 (X : Ada.Exceptions.Exception_Occurrence)
833 Prefix : constant String := "adjust/finalize raised ";
834 Orig_Msg : constant String := Exception_Message (X);
835 Orig_Prefix_Length : constant Natural :=
836 Integer'Min (Prefix'Length, Orig_Msg'Length);
837 Orig_Prefix : String renames Orig_Msg
839 Orig_Msg'First + Orig_Prefix_Length - 1);
841 -- Message already has proper prefix, just re-reraise
843 if Orig_Prefix = Prefix then
844 Raise_Exception_No_Defer
845 (E => Program_Error'Identity,
846 Message => Orig_Msg);
850 New_Msg : constant String := Prefix & Exception_Name (X);
853 -- No message present, just provide our own
855 if Orig_Msg = "" then
856 Raise_Exception_No_Defer
857 (E => Program_Error'Identity,
860 -- Message present, add informational prefix
863 Raise_Exception_No_Defer
864 (E => Program_Error'Identity,
865 Message => New_Msg & ": " & Orig_Msg);
869 end Raise_From_Controlled_Operation;
871 -------------------------------
872 -- Raise_From_Signal_Handler --
873 -------------------------------
875 procedure Raise_From_Signal_Handler
880 Exception_Data.Set_Exception_C_Msg (E, M);
882 Process_Raise_Exception (E);
883 end Raise_From_Signal_Handler;
885 -------------------------
886 -- Raise_Program_Error --
887 -------------------------
889 procedure Raise_Program_Error
890 (File : System.Address;
894 Raise_With_Location_And_Msg
895 (Program_Error_Def'Access, File, Line);
896 end Raise_Program_Error;
898 -----------------------------
899 -- Raise_Program_Error_Msg --
900 -----------------------------
902 procedure Raise_Program_Error_Msg
903 (File : System.Address;
905 Msg : System.Address)
908 Raise_With_Location_And_Msg
909 (Program_Error_Def'Access, File, Line, Msg);
910 end Raise_Program_Error_Msg;
912 -------------------------
913 -- Raise_Storage_Error --
914 -------------------------
916 procedure Raise_Storage_Error
917 (File : System.Address;
921 Raise_With_Location_And_Msg
922 (Storage_Error_Def'Access, File, Line);
923 end Raise_Storage_Error;
925 -----------------------------
926 -- Raise_Storage_Error_Msg --
927 -----------------------------
929 procedure Raise_Storage_Error_Msg
930 (File : System.Address;
932 Msg : System.Address)
935 Raise_With_Location_And_Msg
936 (Storage_Error_Def'Access, File, Line, Msg);
937 end Raise_Storage_Error_Msg;
939 ---------------------------------
940 -- Raise_With_Location_And_Msg --
941 ---------------------------------
943 procedure Raise_With_Location_And_Msg
947 M : System.Address := System.Null_Address)
950 Exception_Data.Set_Exception_C_Msg (E, F, L, Msg2 => M);
952 Raise_Current_Excep (E);
953 end Raise_With_Location_And_Msg;
959 procedure Raise_With_Msg (E : Exception_Id) is
960 Excep : constant EOA := Get_Current_Excep.all;
963 Excep.Exception_Raised := False;
965 Excep.Num_Tracebacks := 0;
966 Excep.Pid := Local_Partition_ID;
968 Raise_Current_Excep (E);
971 --------------------------------------
972 -- Calls to Run-Time Check Routines --
973 --------------------------------------
975 procedure Rcheck_00 (File : System.Address; Line : Integer) is
977 Raise_Constraint_Error_Msg (File, Line, Rmsg_00'Address);
980 procedure Rcheck_01 (File : System.Address; Line : Integer) is
982 Raise_Constraint_Error_Msg (File, Line, Rmsg_01'Address);
985 procedure Rcheck_02 (File : System.Address; Line : Integer) is
987 Raise_Constraint_Error_Msg (File, Line, Rmsg_02'Address);
990 procedure Rcheck_03 (File : System.Address; Line : Integer) is
992 Raise_Constraint_Error_Msg (File, Line, Rmsg_03'Address);
995 procedure Rcheck_04 (File : System.Address; Line : Integer) is
997 Raise_Constraint_Error_Msg (File, Line, Rmsg_04'Address);
1000 procedure Rcheck_05 (File : System.Address; Line : Integer) is
1002 Raise_Constraint_Error_Msg (File, Line, Rmsg_05'Address);
1005 procedure Rcheck_06 (File : System.Address; Line : Integer) is
1007 Raise_Constraint_Error_Msg (File, Line, Rmsg_06'Address);
1010 procedure Rcheck_07 (File : System.Address; Line : Integer) is
1012 Raise_Constraint_Error_Msg (File, Line, Rmsg_07'Address);
1015 procedure Rcheck_08 (File : System.Address; Line : Integer) is
1017 Raise_Constraint_Error_Msg (File, Line, Rmsg_08'Address);
1020 procedure Rcheck_09 (File : System.Address; Line : Integer) is
1022 Raise_Constraint_Error_Msg (File, Line, Rmsg_09'Address);
1025 procedure Rcheck_10 (File : System.Address; Line : Integer) is
1027 Raise_Constraint_Error_Msg (File, Line, Rmsg_10'Address);
1030 procedure Rcheck_11 (File : System.Address; Line : Integer) is
1032 Raise_Constraint_Error_Msg (File, Line, Rmsg_11'Address);
1035 procedure Rcheck_12 (File : System.Address; Line : Integer) is
1037 Raise_Constraint_Error_Msg (File, Line, Rmsg_12'Address);
1040 procedure Rcheck_13 (File : System.Address; Line : Integer) is
1042 Raise_Constraint_Error_Msg (File, Line, Rmsg_13'Address);
1045 procedure Rcheck_14 (File : System.Address; Line : Integer) is
1047 Raise_Program_Error_Msg (File, Line, Rmsg_14'Address);
1050 procedure Rcheck_15 (File : System.Address; Line : Integer) is
1052 Raise_Program_Error_Msg (File, Line, Rmsg_15'Address);
1055 procedure Rcheck_16 (File : System.Address; Line : Integer) is
1057 Raise_Program_Error_Msg (File, Line, Rmsg_16'Address);
1060 procedure Rcheck_17 (File : System.Address; Line : Integer) is
1062 Raise_Program_Error_Msg (File, Line, Rmsg_17'Address);
1065 procedure Rcheck_18 (File : System.Address; Line : Integer) is
1067 Raise_Program_Error_Msg (File, Line, Rmsg_18'Address);
1070 procedure Rcheck_19 (File : System.Address; Line : Integer) is
1072 Raise_Program_Error_Msg (File, Line, Rmsg_19'Address);
1075 procedure Rcheck_20 (File : System.Address; Line : Integer) is
1077 Raise_Program_Error_Msg (File, Line, Rmsg_20'Address);
1080 procedure Rcheck_21 (File : System.Address; Line : Integer) is
1082 Raise_Program_Error_Msg (File, Line, Rmsg_21'Address);
1085 procedure Rcheck_22 (File : System.Address; Line : Integer) is
1086 E : constant Exception_Id := Program_Error_Def'Access;
1088 -- This is "finalize/adjust raised exception".
1089 -- As this exception is only raised with aborts defered, it must
1090 -- call Raise_Exception_No_Defer, contrary to all other Rcheck
1091 -- subprograms (which defer aborts).
1092 -- This is coherent with Raise_From_Controlled_Operation.
1094 Exception_Data.Set_Exception_C_Msg (E, File, Line, 0, Rmsg_22'Address);
1095 Raise_Current_Excep (E);
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_Program_Error_Msg (File, Line, Rmsg_29'Address);
1133 procedure Rcheck_30 (File : System.Address; Line : Integer) is
1135 Raise_Program_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);
1148 procedure Rcheck_33 (File : System.Address; Line : Integer) is
1150 Raise_Storage_Error_Msg (File, Line, Rmsg_33'Address);
1153 procedure Rcheck_34 (File : System.Address; Line : Integer) is
1155 Raise_Storage_Error_Msg (File, Line, Rmsg_34'Address);
1162 procedure Reraise is
1163 Excep : constant EOA := Get_Current_Excep.all;
1167 Raise_Current_Excep (Excep.Id);
1170 ------------------------
1171 -- Reraise_Occurrence --
1172 ------------------------
1174 procedure Reraise_Occurrence (X : Exception_Occurrence) is
1176 if X.Id /= null then
1178 Save_Occurrence (Get_Current_Excep.all.all, X);
1179 Raise_Current_Excep (X.Id);
1181 end Reraise_Occurrence;
1183 -------------------------------
1184 -- Reraise_Occurrence_Always --
1185 -------------------------------
1187 procedure Reraise_Occurrence_Always (X : Exception_Occurrence) is
1190 Save_Occurrence (Get_Current_Excep.all.all, X);
1191 Raise_Current_Excep (X.Id);
1192 end Reraise_Occurrence_Always;
1194 ---------------------------------
1195 -- Reraise_Occurrence_No_Defer --
1196 ---------------------------------
1198 procedure Reraise_Occurrence_No_Defer (X : Exception_Occurrence) is
1200 Save_Occurrence (Get_Current_Excep.all.all, X);
1201 Raise_Current_Excep (X.Id);
1202 end Reraise_Occurrence_No_Defer;
1204 ---------------------
1205 -- Save_Occurrence --
1206 ---------------------
1208 procedure Save_Occurrence
1209 (Target : out Exception_Occurrence;
1210 Source : Exception_Occurrence)
1213 Target.Id := Source.Id;
1214 Target.Msg_Length := Source.Msg_Length;
1215 Target.Num_Tracebacks := Source.Num_Tracebacks;
1216 Target.Pid := Source.Pid;
1218 Target.Msg (1 .. Target.Msg_Length) :=
1219 Source.Msg (1 .. Target.Msg_Length);
1221 Target.Tracebacks (1 .. Target.Num_Tracebacks) :=
1222 Source.Tracebacks (1 .. Target.Num_Tracebacks);
1223 end Save_Occurrence;
1225 function Save_Occurrence (Source : Exception_Occurrence) return EOA is
1226 Target : constant EOA := new Exception_Occurrence;
1228 Save_Occurrence (Target.all, Source);
1230 end Save_Occurrence;
1236 function String_To_EId (S : String) return Exception_Id
1237 renames Stream_Attributes.String_To_EId;
1243 function String_To_EO (S : String) return Exception_Occurrence
1244 renames Stream_Attributes.String_To_EO;
1250 procedure To_Stderr (C : Character) is
1251 type int is new Integer;
1253 procedure put_char_stderr (C : int);
1254 pragma Import (C, put_char_stderr, "put_char_stderr");
1257 put_char_stderr (Character'Pos (C));
1260 procedure To_Stderr (S : String) is
1262 for J in S'Range loop
1263 if S (J) /= ASCII.CR then
1269 -------------------------
1270 -- Transfer_Occurrence --
1271 -------------------------
1273 procedure Transfer_Occurrence
1274 (Target : Exception_Occurrence_Access;
1275 Source : Exception_Occurrence)
1278 Save_Occurrence (Target.all, Source);
1279 end Transfer_Occurrence;
1281 ------------------------
1282 -- Triggered_By_Abort --
1283 ------------------------
1285 function Triggered_By_Abort return Boolean is
1286 Ex : constant Exception_Occurrence_Access := Get_Current_Excep.all;
1289 and then Exception_Identity (Ex.all) = Standard'Abort_Signal'Identity;
1290 end Triggered_By_Abort;