1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- A D A . E X C E P T I O N S --
9 -- Copyright (C) 1992-2007, Free Software Foundation, Inc. --
11 -- GNAT is free software; you can redistribute it and/or modify it under --
12 -- terms of the GNU General Public License as published by the Free Soft- --
13 -- ware Foundation; either version 2, or (at your option) any later ver- --
14 -- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
15 -- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
16 -- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License --
17 -- for more details. You should have received a copy of the GNU General --
18 -- Public License distributed with GNAT; see file COPYING. If not, write --
19 -- to the Free Software Foundation, 51 Franklin Street, Fifth Floor, --
20 -- Boston, MA 02110-1301, USA. --
22 -- As a special exception, if other files instantiate generics from this --
23 -- unit, or you link this unit with other files to produce an executable, --
24 -- this unit does not by itself cause the resulting executable to be --
25 -- covered by the GNU General Public License. This exception does not --
26 -- however invalidate any other reasons why the executable file might be --
27 -- covered by the GNU Public License. --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
32 ------------------------------------------------------------------------------
34 -- This version of Ada.Exceptions is a full Ada 95 version, and Ada 2005
35 -- features such as the additional definitions of Exception_Name returning
36 -- Wide_[Wide_]String.
38 -- It is used for building the compiler and the basic tools, since these
39 -- builds may be done with bootstrap compilers that cannot handle these
40 -- additions. The full version of Ada.Exceptions can be found in the files
41 -- a-except-2005.ads/adb, and is used for all other builds where full Ada
42 -- 2005 functionality is required. in particular, it is used for building
43 -- 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, wether 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 are called from the runtime to raise a specific
377 -- exception with a reason message attached. The parameters are
378 -- the file name and line number in each case. The names are keyed
379 -- to the codes defined in Types.ads and a-types.h (for example,
380 -- the name Rcheck_05 refers to the Reason whose Pos code is 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);
416 pragma Export (C, Rcheck_00, "__gnat_rcheck_00");
417 pragma Export (C, Rcheck_01, "__gnat_rcheck_01");
418 pragma Export (C, Rcheck_02, "__gnat_rcheck_02");
419 pragma Export (C, Rcheck_03, "__gnat_rcheck_03");
420 pragma Export (C, Rcheck_04, "__gnat_rcheck_04");
421 pragma Export (C, Rcheck_05, "__gnat_rcheck_05");
422 pragma Export (C, Rcheck_06, "__gnat_rcheck_06");
423 pragma Export (C, Rcheck_07, "__gnat_rcheck_07");
424 pragma Export (C, Rcheck_08, "__gnat_rcheck_08");
425 pragma Export (C, Rcheck_09, "__gnat_rcheck_09");
426 pragma Export (C, Rcheck_10, "__gnat_rcheck_10");
427 pragma Export (C, Rcheck_11, "__gnat_rcheck_11");
428 pragma Export (C, Rcheck_12, "__gnat_rcheck_12");
429 pragma Export (C, Rcheck_13, "__gnat_rcheck_13");
430 pragma Export (C, Rcheck_14, "__gnat_rcheck_14");
431 pragma Export (C, Rcheck_15, "__gnat_rcheck_15");
432 pragma Export (C, Rcheck_16, "__gnat_rcheck_16");
433 pragma Export (C, Rcheck_17, "__gnat_rcheck_17");
434 pragma Export (C, Rcheck_18, "__gnat_rcheck_18");
435 pragma Export (C, Rcheck_19, "__gnat_rcheck_19");
436 pragma Export (C, Rcheck_20, "__gnat_rcheck_20");
437 pragma Export (C, Rcheck_21, "__gnat_rcheck_21");
438 pragma Export (C, Rcheck_22, "__gnat_rcheck_22");
439 pragma Export (C, Rcheck_23, "__gnat_rcheck_23");
440 pragma Export (C, Rcheck_24, "__gnat_rcheck_24");
441 pragma Export (C, Rcheck_25, "__gnat_rcheck_25");
442 pragma Export (C, Rcheck_26, "__gnat_rcheck_26");
443 pragma Export (C, Rcheck_27, "__gnat_rcheck_27");
444 pragma Export (C, Rcheck_28, "__gnat_rcheck_28");
445 pragma Export (C, Rcheck_29, "__gnat_rcheck_29");
446 pragma Export (C, Rcheck_30, "__gnat_rcheck_30");
447 pragma Export (C, Rcheck_31, "__gnat_rcheck_31");
448 pragma Export (C, Rcheck_32, "__gnat_rcheck_32");
450 -- None of these procedures ever returns (they raise an exception!). By
451 -- using pragma No_Return, we ensure that any junk code after the call,
452 -- such as normal return epilog stuff, can be eliminated).
454 pragma No_Return (Rcheck_00);
455 pragma No_Return (Rcheck_01);
456 pragma No_Return (Rcheck_02);
457 pragma No_Return (Rcheck_03);
458 pragma No_Return (Rcheck_04);
459 pragma No_Return (Rcheck_05);
460 pragma No_Return (Rcheck_06);
461 pragma No_Return (Rcheck_07);
462 pragma No_Return (Rcheck_08);
463 pragma No_Return (Rcheck_09);
464 pragma No_Return (Rcheck_10);
465 pragma No_Return (Rcheck_11);
466 pragma No_Return (Rcheck_12);
467 pragma No_Return (Rcheck_13);
468 pragma No_Return (Rcheck_14);
469 pragma No_Return (Rcheck_15);
470 pragma No_Return (Rcheck_16);
471 pragma No_Return (Rcheck_17);
472 pragma No_Return (Rcheck_18);
473 pragma No_Return (Rcheck_19);
474 pragma No_Return (Rcheck_20);
475 pragma No_Return (Rcheck_21);
476 pragma No_Return (Rcheck_22);
477 pragma No_Return (Rcheck_23);
478 pragma No_Return (Rcheck_24);
479 pragma No_Return (Rcheck_25);
480 pragma No_Return (Rcheck_26);
481 pragma No_Return (Rcheck_27);
482 pragma No_Return (Rcheck_28);
483 pragma No_Return (Rcheck_29);
484 pragma No_Return (Rcheck_30);
485 pragma No_Return (Rcheck_32);
487 ---------------------------------------------
488 -- Reason Strings for Run-Time Check Calls --
489 ---------------------------------------------
491 -- These strings are null-terminated and are used by Rcheck_nn. The
492 -- strings correspond to the definitions for Types.RT_Exception_Code.
496 Rmsg_00 : constant String := "access check failed" & NUL;
497 Rmsg_01 : constant String := "access parameter is null" & NUL;
498 Rmsg_02 : constant String := "discriminant check failed" & NUL;
499 Rmsg_03 : constant String := "divide by zero" & NUL;
500 Rmsg_04 : constant String := "explicit raise" & NUL;
501 Rmsg_05 : constant String := "index check failed" & NUL;
502 Rmsg_06 : constant String := "invalid data" & NUL;
503 Rmsg_07 : constant String := "length check failed" & NUL;
504 Rmsg_08 : constant String := "null Exception_Id" & NUL;
505 Rmsg_09 : constant String := "null-exclusion check failed" & NUL;
506 Rmsg_10 : constant String := "overflow check failed" & NUL;
507 Rmsg_11 : constant String := "partition check failed" & NUL;
508 Rmsg_12 : constant String := "range check failed" & NUL;
509 Rmsg_13 : constant String := "tag check failed" & NUL;
510 Rmsg_14 : constant String := "access before elaboration" & NUL;
511 Rmsg_15 : constant String := "accessibility check failed" & NUL;
512 Rmsg_16 : constant String := "all guards closed" & NUL;
513 Rmsg_17 : constant String := "Current_Task referenced in entry" &
515 Rmsg_18 : constant String := "duplicated entry address" & NUL;
516 Rmsg_19 : constant String := "explicit raise" & NUL;
517 Rmsg_20 : constant String := "finalize/adjust raised exception" & NUL;
518 Rmsg_21 : constant String := "implicit return with No_Return" & NUL;
519 Rmsg_22 : constant String := "misaligned address value" & NUL;
520 Rmsg_23 : constant String := "missing return" & NUL;
521 Rmsg_24 : constant String := "overlaid controlled object" & NUL;
522 Rmsg_25 : constant String := "potentially blocking operation" & NUL;
523 Rmsg_26 : constant String := "stubbed subprogram called" & NUL;
524 Rmsg_27 : constant String := "unchecked union restriction" & NUL;
525 Rmsg_28 : constant String := "actual/returned class-wide value "
526 & "not transportable" & NUL;
527 Rmsg_29 : constant String := "empty storage pool" & NUL;
528 Rmsg_30 : constant String := "explicit raise" & NUL;
529 Rmsg_31 : constant String := "infinite recursion" & NUL;
530 Rmsg_32 : constant String := "object too large" & NUL;
532 -----------------------
533 -- Polling Interface --
534 -----------------------
536 type Unsigned is mod 2 ** 32;
538 Counter : Unsigned := 0;
539 pragma Warnings (Off, Counter);
540 -- This counter is provided for convenience. It can be used in Poll to
541 -- perform periodic but not systematic operations.
543 procedure Poll is separate;
544 -- The actual polling routine is separate, so that it can easily
545 -- be replaced with a target dependent version.
547 ------------------------------
548 -- Current_Target_Exception --
549 ------------------------------
551 function Current_Target_Exception return Exception_Occurrence is
553 return Null_Occurrence;
554 end Current_Target_Exception;
560 function EId_To_String (X : Exception_Id) return String
561 renames Stream_Attributes.EId_To_String;
567 -- We use the null string to represent the null occurrence, otherwise
568 -- we output the Exception_Information string for the occurrence.
570 function EO_To_String (X : Exception_Occurrence) return String
571 renames Stream_Attributes.EO_To_String;
573 ------------------------
574 -- Exception_Identity --
575 ------------------------
577 function Exception_Identity
578 (X : Exception_Occurrence) return Exception_Id
581 -- Note that the following test used to be here for the original
582 -- Ada 95 semantics, but these were modified by AI-241 to require
583 -- returning Null_Id instead of raising Constraint_Error.
585 -- if X.Id = Null_Id then
586 -- raise Constraint_Error;
590 end Exception_Identity;
592 ---------------------------
593 -- Exception_Information --
594 ---------------------------
596 function Exception_Information (X : Exception_Occurrence) return String is
598 if X.Id = Null_Id then
599 raise Constraint_Error;
602 return Exception_Data.Exception_Information (X);
603 end Exception_Information;
605 -----------------------
606 -- Exception_Message --
607 -----------------------
609 function Exception_Message (X : Exception_Occurrence) return String is
611 if X.Id = Null_Id then
612 raise Constraint_Error;
615 return X.Msg (1 .. X.Msg_Length);
616 end Exception_Message;
622 function Exception_Name (Id : Exception_Id) return String is
625 raise Constraint_Error;
628 return To_Ptr (Id.Full_Name) (1 .. Id.Name_Length - 1);
631 function Exception_Name (X : Exception_Occurrence) return String is
633 return Exception_Name (X.Id);
636 ---------------------------
637 -- Exception_Name_Simple --
638 ---------------------------
640 function Exception_Name_Simple (X : Exception_Occurrence) return String is
641 Name : constant String := Exception_Name (X);
647 exit when Name (P - 1) = '.';
651 -- Return result making sure lower bound is 1
654 subtype Rname is String (1 .. Name'Length - P + 1);
656 return Rname (Name (P .. Name'Length));
658 end Exception_Name_Simple;
664 package body Exception_Data is separate;
665 -- This package can be easily dummied out if we do not want the
666 -- basic support for exception messages (such as in Ada 83).
668 package body Exception_Propagation is
670 procedure Setup_Exception
673 Reraised : Boolean := False)
675 pragma Warnings (Off, Excep);
676 pragma Warnings (Off, Current);
677 pragma Warnings (Off, Reraised);
682 end Exception_Propagation;
684 ----------------------
685 -- Exception_Traces --
686 ----------------------
688 package body Exception_Traces is separate;
689 -- Depending on the underlying support for IO the implementation
690 -- will differ. Moreover we would like to dummy out this package
691 -- in case we do not want any exception tracing support. This is
692 -- why this package is separated.
694 -----------------------
695 -- Stream Attributes --
696 -----------------------
698 package body Stream_Attributes is separate;
699 -- This package can be easily dummied out if we do not want the
700 -- support for streaming Exception_Ids and Exception_Occurrences.
702 -----------------------------
703 -- Process_Raise_Exception --
704 -----------------------------
706 procedure Process_Raise_Exception (E : Exception_Id) is
707 pragma Inspection_Point (E);
708 -- This is so the debugger can reliably inspect the parameter
710 Jumpbuf_Ptr : constant Address := Get_Jmpbuf_Address.all;
711 Excep : constant EOA := Get_Current_Excep.all;
713 procedure builtin_longjmp (buffer : Address; Flag : Integer);
714 pragma No_Return (builtin_longjmp);
715 pragma Import (C, builtin_longjmp, "_gnat_builtin_longjmp");
718 -- WARNING: There should be no exception handler for this body
719 -- because this would cause gigi to prepend a setup for a new
720 -- jmpbuf to the sequence of statements in case of built-in sjljl.
721 -- We would then always get this new buf in Jumpbuf_Ptr instead of the
722 -- one for the exception we are handling, which would completely break
723 -- the whole design of this procedure.
725 -- If the jump buffer pointer is non-null, transfer control using
726 -- it. Otherwise announce an unhandled exception (note that this
727 -- means that we have no finalizations to do other than at the outer
728 -- level). Perform the necessary notification tasks in both cases.
730 if Jumpbuf_Ptr /= Null_Address then
731 if not Excep.Exception_Raised then
732 Excep.Exception_Raised := True;
733 Exception_Traces.Notify_Handled_Exception;
736 builtin_longjmp (Jumpbuf_Ptr, 1);
739 Exception_Traces.Notify_Unhandled_Exception;
740 Exception_Traces.Unhandled_Exception_Terminate;
742 end Process_Raise_Exception;
744 ----------------------------
745 -- Raise_Constraint_Error --
746 ----------------------------
748 procedure Raise_Constraint_Error
749 (File : System.Address;
753 Raise_With_Location_And_Msg
754 (Constraint_Error_Def'Access, File, Line);
755 end Raise_Constraint_Error;
757 --------------------------------
758 -- Raise_Constraint_Error_Msg --
759 --------------------------------
761 procedure Raise_Constraint_Error_Msg
762 (File : System.Address;
764 Msg : System.Address)
767 Raise_With_Location_And_Msg
768 (Constraint_Error_Def'Access, File, Line, Msg);
769 end Raise_Constraint_Error_Msg;
771 -------------------------
772 -- Raise_Current_Excep --
773 -------------------------
775 procedure Raise_Current_Excep (E : Exception_Id) is
777 pragma Inspection_Point (E);
778 -- This is so the debugger can reliably inspect the parameter when
779 -- inserting a breakpoint at the start of this procedure.
781 Id : Exception_Id := E;
782 pragma Volatile (Id);
783 pragma Warnings (Off, Id);
784 -- In order to provide support for breakpoints on unhandled exceptions,
785 -- the debugger will also need to be able to inspect the value of E from
786 -- another (inner) frame. So we need to make sure that if E is passed in
787 -- a register, its value is also spilled on stack. For this, we store
788 -- the parameter value in a local variable, and add a pragma Volatile to
789 -- make sure it is spilled. The pragma Warnings (Off) is needed because
790 -- the compiler knows that Id is not referenced and that this use of
791 -- pragma Volatile is peculiar!
794 Debug_Raise_Exception (E => SSL.Exception_Data_Ptr (E));
795 Process_Raise_Exception (E);
796 end Raise_Current_Excep;
798 ---------------------
799 -- Raise_Exception --
800 ---------------------
802 procedure Raise_Exception
804 Message : String := "")
808 Exception_Data.Set_Exception_Msg (E, Message);
810 Raise_Current_Excep (E);
813 -- Note: if E is null then just return (Ada 95 semantics)
818 ----------------------------
819 -- Raise_Exception_Always --
820 ----------------------------
822 procedure Raise_Exception_Always
824 Message : String := "")
827 Exception_Data.Set_Exception_Msg (E, Message);
829 Raise_Current_Excep (E);
830 end Raise_Exception_Always;
832 -------------------------------------
833 -- Raise_From_Controlled_Operation --
834 -------------------------------------
836 procedure Raise_From_Controlled_Operation
837 (X : Ada.Exceptions.Exception_Occurrence)
839 Prefix : constant String := "adjust/finalize raised ";
840 Orig_Msg : constant String := Exception_Message (X);
841 New_Msg : constant String := Prefix & Exception_Name (X);
844 if Orig_Msg'Length >= Prefix'Length
846 Orig_Msg (Orig_Msg'First .. Orig_Msg'First + Prefix'Length - 1) =
849 -- Message already has proper prefix, just re-reraise PROGRAM_ERROR
851 Raise_Exception_No_Defer
852 (E => Program_Error'Identity,
853 Message => Orig_Msg);
855 elsif Orig_Msg = "" then
857 -- No message present: just provide our own
859 Raise_Exception_No_Defer
860 (E => Program_Error'Identity,
864 -- Message present, add informational prefix
866 Raise_Exception_No_Defer
867 (E => Program_Error'Identity,
868 Message => New_Msg & ": " & Orig_Msg);
870 end Raise_From_Controlled_Operation;
872 -------------------------------
873 -- Raise_From_Signal_Handler --
874 -------------------------------
876 procedure Raise_From_Signal_Handler
881 Exception_Data.Set_Exception_C_Msg (E, M);
883 Process_Raise_Exception (E);
884 end Raise_From_Signal_Handler;
886 -------------------------
887 -- Raise_Program_Error --
888 -------------------------
890 procedure Raise_Program_Error
891 (File : System.Address;
895 Raise_With_Location_And_Msg
896 (Program_Error_Def'Access, File, Line);
897 end Raise_Program_Error;
899 -----------------------------
900 -- Raise_Program_Error_Msg --
901 -----------------------------
903 procedure Raise_Program_Error_Msg
904 (File : System.Address;
906 Msg : System.Address)
909 Raise_With_Location_And_Msg
910 (Program_Error_Def'Access, File, Line, Msg);
911 end Raise_Program_Error_Msg;
913 -------------------------
914 -- Raise_Storage_Error --
915 -------------------------
917 procedure Raise_Storage_Error
918 (File : System.Address;
922 Raise_With_Location_And_Msg
923 (Storage_Error_Def'Access, File, Line);
924 end Raise_Storage_Error;
926 -----------------------------
927 -- Raise_Storage_Error_Msg --
928 -----------------------------
930 procedure Raise_Storage_Error_Msg
931 (File : System.Address;
933 Msg : System.Address)
936 Raise_With_Location_And_Msg
937 (Storage_Error_Def'Access, File, Line, Msg);
938 end Raise_Storage_Error_Msg;
940 ---------------------------------
941 -- Raise_With_Location_And_Msg --
942 ---------------------------------
944 procedure Raise_With_Location_And_Msg
948 M : System.Address := System.Null_Address)
951 Exception_Data.Set_Exception_C_Msg (E, F, L, M);
953 Raise_Current_Excep (E);
954 end Raise_With_Location_And_Msg;
960 procedure Raise_With_Msg (E : Exception_Id) is
961 Excep : constant EOA := Get_Current_Excep.all;
964 Excep.Exception_Raised := False;
966 Excep.Num_Tracebacks := 0;
967 Excep.Cleanup_Flag := False;
968 Excep.Pid := Local_Partition_ID;
970 Raise_Current_Excep (E);
973 --------------------------------------
974 -- Calls to Run-Time Check Routines --
975 --------------------------------------
977 procedure Rcheck_00 (File : System.Address; Line : Integer) is
979 Raise_Constraint_Error_Msg (File, Line, Rmsg_00'Address);
982 procedure Rcheck_01 (File : System.Address; Line : Integer) is
984 Raise_Constraint_Error_Msg (File, Line, Rmsg_01'Address);
987 procedure Rcheck_02 (File : System.Address; Line : Integer) is
989 Raise_Constraint_Error_Msg (File, Line, Rmsg_02'Address);
992 procedure Rcheck_03 (File : System.Address; Line : Integer) is
994 Raise_Constraint_Error_Msg (File, Line, Rmsg_03'Address);
997 procedure Rcheck_04 (File : System.Address; Line : Integer) is
999 Raise_Constraint_Error_Msg (File, Line, Rmsg_04'Address);
1002 procedure Rcheck_05 (File : System.Address; Line : Integer) is
1004 Raise_Constraint_Error_Msg (File, Line, Rmsg_05'Address);
1007 procedure Rcheck_06 (File : System.Address; Line : Integer) is
1009 Raise_Constraint_Error_Msg (File, Line, Rmsg_06'Address);
1012 procedure Rcheck_07 (File : System.Address; Line : Integer) is
1014 Raise_Constraint_Error_Msg (File, Line, Rmsg_07'Address);
1017 procedure Rcheck_08 (File : System.Address; Line : Integer) is
1019 Raise_Constraint_Error_Msg (File, Line, Rmsg_08'Address);
1022 procedure Rcheck_09 (File : System.Address; Line : Integer) is
1024 Raise_Constraint_Error_Msg (File, Line, Rmsg_09'Address);
1027 procedure Rcheck_10 (File : System.Address; Line : Integer) is
1029 Raise_Constraint_Error_Msg (File, Line, Rmsg_10'Address);
1032 procedure Rcheck_11 (File : System.Address; Line : Integer) is
1034 Raise_Constraint_Error_Msg (File, Line, Rmsg_11'Address);
1037 procedure Rcheck_12 (File : System.Address; Line : Integer) is
1039 Raise_Constraint_Error_Msg (File, Line, Rmsg_12'Address);
1042 procedure Rcheck_13 (File : System.Address; Line : Integer) is
1044 Raise_Constraint_Error_Msg (File, Line, Rmsg_13'Address);
1047 procedure Rcheck_14 (File : System.Address; Line : Integer) is
1049 Raise_Program_Error_Msg (File, Line, Rmsg_14'Address);
1052 procedure Rcheck_15 (File : System.Address; Line : Integer) is
1054 Raise_Program_Error_Msg (File, Line, Rmsg_15'Address);
1057 procedure Rcheck_16 (File : System.Address; Line : Integer) is
1059 Raise_Program_Error_Msg (File, Line, Rmsg_16'Address);
1062 procedure Rcheck_17 (File : System.Address; Line : Integer) is
1064 Raise_Program_Error_Msg (File, Line, Rmsg_17'Address);
1067 procedure Rcheck_18 (File : System.Address; Line : Integer) is
1069 Raise_Program_Error_Msg (File, Line, Rmsg_18'Address);
1072 procedure Rcheck_19 (File : System.Address; Line : Integer) is
1074 Raise_Program_Error_Msg (File, Line, Rmsg_19'Address);
1077 procedure Rcheck_20 (File : System.Address; Line : Integer) is
1079 Raise_Program_Error_Msg (File, Line, Rmsg_20'Address);
1082 procedure Rcheck_21 (File : System.Address; Line : Integer) is
1084 Raise_Program_Error_Msg (File, Line, Rmsg_21'Address);
1087 procedure Rcheck_22 (File : System.Address; Line : Integer) is
1089 Raise_Program_Error_Msg (File, Line, Rmsg_22'Address);
1092 procedure Rcheck_23 (File : System.Address; Line : Integer) is
1094 Raise_Program_Error_Msg (File, Line, Rmsg_23'Address);
1097 procedure Rcheck_24 (File : System.Address; Line : Integer) is
1099 Raise_Program_Error_Msg (File, Line, Rmsg_24'Address);
1102 procedure Rcheck_25 (File : System.Address; Line : Integer) is
1104 Raise_Program_Error_Msg (File, Line, Rmsg_25'Address);
1107 procedure Rcheck_26 (File : System.Address; Line : Integer) is
1109 Raise_Program_Error_Msg (File, Line, Rmsg_26'Address);
1112 procedure Rcheck_27 (File : System.Address; Line : Integer) is
1114 Raise_Program_Error_Msg (File, Line, Rmsg_27'Address);
1117 procedure Rcheck_28 (File : System.Address; Line : Integer) is
1119 Raise_Program_Error_Msg (File, Line, Rmsg_28'Address);
1122 procedure Rcheck_29 (File : System.Address; Line : Integer) is
1124 Raise_Storage_Error_Msg (File, Line, Rmsg_29'Address);
1127 procedure Rcheck_30 (File : System.Address; Line : Integer) is
1129 Raise_Storage_Error_Msg (File, Line, Rmsg_30'Address);
1132 procedure Rcheck_31 (File : System.Address; Line : Integer) is
1134 Raise_Storage_Error_Msg (File, Line, Rmsg_31'Address);
1137 procedure Rcheck_32 (File : System.Address; Line : Integer) is
1139 Raise_Storage_Error_Msg (File, Line, Rmsg_32'Address);
1146 procedure Reraise is
1147 Excep : constant EOA := Get_Current_Excep.all;
1151 Raise_Current_Excep (Excep.Id);
1154 ------------------------
1155 -- Reraise_Occurrence --
1156 ------------------------
1158 procedure Reraise_Occurrence (X : Exception_Occurrence) is
1160 if X.Id /= null then
1162 Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1163 Raise_Current_Excep (X.Id);
1165 end Reraise_Occurrence;
1167 -------------------------------
1168 -- Reraise_Occurrence_Always --
1169 -------------------------------
1171 procedure Reraise_Occurrence_Always (X : Exception_Occurrence) is
1174 Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1175 Raise_Current_Excep (X.Id);
1176 end Reraise_Occurrence_Always;
1178 ---------------------------------
1179 -- Reraise_Occurrence_No_Defer --
1180 ---------------------------------
1182 procedure Reraise_Occurrence_No_Defer (X : Exception_Occurrence) is
1184 Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1185 Raise_Current_Excep (X.Id);
1186 end Reraise_Occurrence_No_Defer;
1188 ---------------------
1189 -- Save_Occurrence --
1190 ---------------------
1192 procedure Save_Occurrence
1193 (Target : out Exception_Occurrence;
1194 Source : Exception_Occurrence)
1197 Save_Occurrence_No_Private (Target, Source);
1198 end Save_Occurrence;
1200 function Save_Occurrence (Source : Exception_Occurrence) return EOA is
1201 Target : constant EOA := new Exception_Occurrence;
1203 Save_Occurrence (Target.all, Source);
1205 end Save_Occurrence;
1207 --------------------------------
1208 -- Save_Occurrence_No_Private --
1209 --------------------------------
1211 procedure Save_Occurrence_No_Private
1212 (Target : out Exception_Occurrence;
1213 Source : Exception_Occurrence)
1216 Target.Id := Source.Id;
1217 Target.Msg_Length := Source.Msg_Length;
1218 Target.Num_Tracebacks := Source.Num_Tracebacks;
1219 Target.Pid := Source.Pid;
1220 Target.Cleanup_Flag := Source.Cleanup_Flag;
1222 Target.Msg (1 .. Target.Msg_Length) :=
1223 Source.Msg (1 .. Target.Msg_Length);
1225 Target.Tracebacks (1 .. Target.Num_Tracebacks) :=
1226 Source.Tracebacks (1 .. Target.Num_Tracebacks);
1227 end Save_Occurrence_No_Private;
1229 -------------------------
1230 -- Transfer_Occurrence --
1231 -------------------------
1233 procedure Transfer_Occurrence
1234 (Target : Exception_Occurrence_Access;
1235 Source : Exception_Occurrence)
1238 -- Setup Target as an exception to be propagated in the calling task
1239 -- (rendezvous-wise), taking care not to clobber the associated private
1240 -- data. Target is expected to be a pointer to the calling task's
1241 -- fixed TSD occurrence, which is very different from Get_Current_Excep
1242 -- here because this subprogram is called from the called task.
1244 Save_Occurrence_No_Private (Target.all, Source);
1245 end Transfer_Occurrence;
1251 function String_To_EId (S : String) return Exception_Id
1252 renames Stream_Attributes.String_To_EId;
1258 function String_To_EO (S : String) return Exception_Occurrence
1259 renames Stream_Attributes.String_To_EO;
1261 ------------------------------
1262 -- Raise_Exception_No_Defer --
1263 ------------------------------
1265 procedure Raise_Exception_No_Defer
1267 Message : String := "")
1270 Exception_Data.Set_Exception_Msg (E, Message);
1272 -- Do not call Abort_Defer.all, as specified by the spec
1274 Raise_Current_Excep (E);
1275 end Raise_Exception_No_Defer;
1281 procedure To_Stderr (C : Character) is
1283 type int is new Integer;
1285 procedure put_char_stderr (C : int);
1286 pragma Import (C, put_char_stderr, "put_char_stderr");
1289 put_char_stderr (Character'Pos (C));
1292 procedure To_Stderr (S : String) is
1294 for J in S'Range loop
1295 if S (J) /= ASCII.CR then