1 ------------------------------------------------------------------------------
3 -- GNAT COMPILER COMPONENTS --
5 -- A D A . E X C E P T I O N S --
9 -- Copyright (C) 1992-2004 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, 59 Temple Place - Suite 330, Boston, --
20 -- MA 02111-1307, 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 ------------------------------------------------------------------------------
35 -- We must turn polling off for this unit, because otherwise we get
36 -- elaboration circularities with System.Exception_Tables.
38 pragma Warnings (Off);
39 -- Since several constructs give warnings in 3.14a1, including unreferenced
40 -- variables and pragma Unreferenced itself.
42 with System; use System;
43 with System.Standard_Library; use System.Standard_Library;
44 with System.Soft_Links; use System.Soft_Links;
45 with System.Machine_State_Operations; use System.Machine_State_Operations;
47 package body Ada.Exceptions is
49 procedure builtin_longjmp (buffer : Address; Flag : Integer);
50 pragma No_Return (builtin_longjmp);
51 pragma Import (C, builtin_longjmp, "_gnat_builtin_longjmp");
53 pragma Suppress (All_Checks);
54 -- We definitely do not want exceptions occurring within this unit, or
55 -- we are in big trouble. If an exceptional situation does occur, better
56 -- that it not be raised, since raising it can cause confusing chaos.
58 Zero_Cost_Exceptions : Integer;
59 pragma Import (C, Zero_Cost_Exceptions, "__gl_zero_cost_exceptions");
60 -- Boolean indicating if we are handling exceptions using a zero cost
63 -- Note that although we currently do not support it, the GCC3 back-end
64 -- tables are also potentially useable for setjmp/longjmp processing.
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.
76 -- Mark start and end of procedures in this package
78 -- The AAA and ZZZ procedures are used to provide exclusion bounds in
79 -- calls to Call_Chain at exception raise points from this unit. The
80 -- purpose is to arrange for the exception tracebacks not to include
81 -- frames from routines involved in the raise process, as these are
82 -- meaningless from the user's standpoint.
84 -- For these bounds to be meaningful, we need to ensure that the object
85 -- code for the routines involved in processing a raise is located after
86 -- the object code for AAA and before the object code for ZZZ. This will
87 -- indeed be the case as long as the following rules are respected:
89 -- 1) The bodies of the subprograms involved in processing a raise
90 -- are located after the body of AAA and before the body of ZZZ.
92 -- 2) No pragma Inline applies to any of these subprograms, as this
93 -- could delay the corresponding assembly output until the end of
96 Code_Address_For_AAA, Code_Address_For_ZZZ : System.Address;
97 -- Used to represent addresses really inside the code range for AAA and
98 -- ZZZ, initialized to the address of a label inside the corresponding
99 -- procedure. This is initialization takes place inside the procedures
100 -- themselves, which are called as part of the elaboration code.
102 -- We are doing this instead of merely using Proc'Address because on some
103 -- platforms the latter does not yield the address we want, but the
104 -- address of a stub or of a descriptor instead. This is the case at least
105 -- on Alpha-VMS and PA-HPUX.
107 procedure Call_Chain (Excep : EOA);
108 -- Store up to Max_Tracebacks in Excep, corresponding to the current
111 procedure Process_Raise_Exception
113 From_Signal_Handler : Boolean);
114 pragma No_Return (Process_Raise_Exception);
115 -- This is the lowest level raise routine. It raises the exception
116 -- referenced by Current_Excep.all in the TSD, without deferring abort
117 -- (the caller must ensure that abort is deferred on entry).
119 -- This is the common implementation for Raise_Current_Excep and
120 -- Raise_From_Signal_Handler. The origin of the call is indicated by the
121 -- From_Signal_Handler argument.
123 package Exception_Data is
125 ---------------------------------
126 -- Exception messages routines --
127 ---------------------------------
129 procedure Set_Exception_C_Msg
131 Msg1 : Big_String_Ptr;
133 Msg2 : Big_String_Ptr := null);
134 -- This routine is called to setup the exception referenced by the
135 -- Current_Excep field in the TSD to contain the indicated Id value
136 -- and message. Msg1 is a null terminated string which is generated
137 -- as the exception message. If line is non-zero, then a colon and
138 -- the decimal representation of this integer is appended to the
139 -- message. When Msg2 is non-null, a space and this additional null
140 -- terminated string is added to the message.
142 procedure Set_Exception_Msg
145 -- This routine is called to setup the exception referenced by the
146 -- Current_Excep field in the TSD to contain the indicated Id value
147 -- and message. Message is a string which is generated as the
148 -- exception message.
150 --------------------------------------
151 -- Exception information subprogram --
152 --------------------------------------
154 function Exception_Information (X : Exception_Occurrence) return String;
155 -- The format of the exception information is as follows:
157 -- exception name (as in Exception_Name)
158 -- message (or a null line if no message)
160 -- 0xyyyyyyyy 0xyyyyyyyy ...
162 -- The lines are separated by a ASCII.LF character
163 -- The nnnn is the partition Id given as decimal digits.
164 -- The 0x... line represents traceback program counter locations,
165 -- in order with the first one being the exception location.
167 ---------------------------------------
168 -- Exception backtracing subprograms --
169 ---------------------------------------
171 -- What is automatically output when exception tracing is on basically
172 -- corresponds to the usual exception information, but with the call
173 -- chain backtrace possibly tailored by a backtrace decorator. Modifying
174 -- Exception_Information itself is not a good idea because the decorated
175 -- output is completely out of control and would break all our code
176 -- related to the streaming of exceptions.
178 -- We then provide an alternative function to Exception_Information to
179 -- compute the possibly tailored output, which is equivalent if no
180 -- decorator is currently set.
182 function Tailored_Exception_Information
183 (X : Exception_Occurrence)
185 -- Exception information to be output in the case of automatic tracing
186 -- requested through GNAT.Exception_Traces.
188 -- This is the same as Exception_Information if no backtrace decorator
189 -- is currently in place. Otherwise, this is Exception_Information with
190 -- the call chain raw addresses replaced by the result of a call to the
191 -- current decorator provided with the call chain addresses.
194 (Ada, Tailored_Exception_Information,
195 "__gnat_tailored_exception_information");
196 -- This function is used within this package but also from within
197 -- System.Tasking.Stages.
199 -- The output of Exception_Information and
200 -- Tailored_Exception_Information share a common part which was
201 -- formerly built using local procedures within
202 -- Exception_Information. These procedures have been extracted
203 -- from their original place to be available to
204 -- Tailored_Exception_Information also.
206 -- Each of these procedures appends some input to an
207 -- information string currently being built. The Ptr argument
208 -- represents the last position in this string at which a
209 -- character has been written.
211 procedure Tailored_Exception_Information
212 (X : Exception_Occurrence;
213 Buff : in out String;
214 Last : in out Integer);
215 -- Procedural version of the above function. Instead of returning the
216 -- result, this one is put in Buff (Buff'first .. Buff'first + Last)
217 -- And what happens on overflow ???
221 package Exception_Traces is
224 -- Imports Tailored_Exception_Information
226 ----------------------------------------------
227 -- Run-Time Exception Notification Routines --
228 ----------------------------------------------
230 -- These subprograms provide a common run-time interface to trigger the
231 -- actions required when an exception is about to be propagated (e.g.
232 -- user specified actions or output of exception information). They are
233 -- exported to be usable by the Ada exception handling personality
234 -- routine when the GCC 3 mechanism is used.
236 procedure Notify_Handled_Exception;
237 pragma Export (C, Notify_Handled_Exception,
238 "__gnat_notify_handled_exception");
239 -- This routine is called for a handled occurrence is about to be
242 procedure Notify_Unhandled_Exception;
243 pragma Export (C, Notify_Unhandled_Exception,
244 "__gnat_notify_unhandled_exception");
245 -- This routine is called when an unhandled occurrence is about to be
248 procedure Unhandled_Exception_Terminate;
249 pragma No_Return (Unhandled_Exception_Terminate);
250 -- This procedure is called to terminate execution following an
251 -- unhandled exception. The exception information, including
252 -- traceback if available is output, and execution is then
253 -- terminated. Note that at the point where this routine is
254 -- called, the stack has typically been destroyed.
256 end Exception_Traces;
258 package Exception_Propagation is
260 use Exception_Traces;
261 -- Imports Notify_Unhandled_Exception and
262 -- Unhandled_Exception_Terminate
264 ------------------------------------
265 -- Exception propagation routines --
266 ------------------------------------
268 procedure Setup_Exception
271 Reraised : Boolean := False);
272 -- Perform the necessary operations to prepare the propagation of Excep
273 -- in a task where Current is the current occurrence. Excep is assumed
274 -- to be a valid (non null) pointer.
276 -- This should be called before any (re-)setting of the current
277 -- occurrence. Any such (re-)setting shall take care *not* to clobber
278 -- the Private_Data component.
280 -- Having Current provided as an argument (instead of retrieving it via
281 -- Get_Current_Excep internally) is required to allow one task to setup
282 -- an exception for another task, which is used by Transfer_Occurrence.
284 procedure Propagate_Exception (From_Signal_Handler : Boolean);
285 pragma No_Return (Propagate_Exception);
286 -- This procedure propagates the exception represented by the occurrence
287 -- referenced by Current_Excep in the TSD for the current task.
289 end Exception_Propagation;
291 package Stream_Attributes is
293 --------------------------------
294 -- Stream attributes routines --
295 --------------------------------
297 function EId_To_String (X : Exception_Id) return String;
298 function String_To_EId (S : String) return Exception_Id;
299 -- Functions for implementing Exception_Id stream attributes
301 function EO_To_String (X : Exception_Occurrence) return String;
302 function String_To_EO (S : String) return Exception_Occurrence;
303 -- Functions for implementing Exception_Occurrence stream
306 end Stream_Attributes;
308 procedure Raise_Current_Excep (E : Exception_Id);
309 pragma No_Return (Raise_Current_Excep);
310 pragma Export (C, Raise_Current_Excep, "__gnat_raise_nodefer_with_msg");
311 -- This is a simple wrapper to Process_Raise_Exception setting the
312 -- From_Signal_Handler argument to False.
314 -- This external name for Raise_Current_Excep is historical, and probably
315 -- should be changed but for now we keep it, because gdb and gigi know
318 procedure Raise_Exception_No_Defer
319 (E : Exception_Id; Message : String := "");
321 (Ada, Raise_Exception_No_Defer,
322 "ada__exceptions__raise_exception_no_defer");
323 pragma No_Return (Raise_Exception_No_Defer);
324 -- Similar to Raise_Exception, but with no abort deferral
326 procedure Raise_With_Msg (E : Exception_Id);
327 pragma No_Return (Raise_With_Msg);
328 pragma Export (C, Raise_With_Msg, "__gnat_raise_with_msg");
329 -- Raises an exception with given exception id value. A message
330 -- is associated with the raise, and has already been stored in the
331 -- exception occurrence referenced by the Current_Excep in the TSD.
332 -- Abort is deferred before the raise call.
334 procedure Raise_With_Location_And_Msg
338 M : Big_String_Ptr := null);
339 pragma No_Return (Raise_With_Location_And_Msg);
340 -- Raise an exception with given exception id value. A filename and line
341 -- number is associated with the raise and is stored in the exception
342 -- occurrence and in addition a string message M is appended to
343 -- this (if M is not null).
345 procedure Raise_Constraint_Error
346 (File : Big_String_Ptr;
348 pragma No_Return (Raise_Constraint_Error);
350 (C, Raise_Constraint_Error, "__gnat_raise_constraint_error");
351 -- Raise constraint error with file:line information
353 procedure Raise_Constraint_Error_Msg
354 (File : Big_String_Ptr;
356 Msg : Big_String_Ptr);
357 pragma No_Return (Raise_Constraint_Error_Msg);
359 (C, Raise_Constraint_Error_Msg, "__gnat_raise_constraint_error_msg");
360 -- Raise constraint error with file:line + msg information
362 procedure Raise_Program_Error
363 (File : Big_String_Ptr;
365 pragma No_Return (Raise_Program_Error);
367 (C, Raise_Program_Error, "__gnat_raise_program_error");
368 -- Raise program error with file:line information
370 procedure Raise_Program_Error_Msg
371 (File : Big_String_Ptr;
373 Msg : Big_String_Ptr);
374 pragma No_Return (Raise_Program_Error_Msg);
376 (C, Raise_Program_Error_Msg, "__gnat_raise_program_error_msg");
377 -- Raise program error with file:line + msg information
379 procedure Raise_Storage_Error
380 (File : Big_String_Ptr;
382 pragma No_Return (Raise_Storage_Error);
384 (C, Raise_Storage_Error, "__gnat_raise_storage_error");
385 -- Raise storage error with file:line information
387 procedure Raise_Storage_Error_Msg
388 (File : Big_String_Ptr;
390 Msg : Big_String_Ptr);
391 pragma No_Return (Raise_Storage_Error_Msg);
393 (C, Raise_Storage_Error_Msg, "__gnat_raise_storage_error_msg");
394 -- Raise storage error with file:line + reason msg information
396 -- The exception raising process and the automatic tracing mechanism rely
397 -- on some careful use of flags attached to the exception occurrence. The
398 -- graph below illustrates the relations between the Raise_ subprograms
399 -- and identifies the points where basic flags such as Exception_Raised
402 -- (i) signs indicate the flags initialization points. R stands for Raise,
403 -- W for With, and E for Exception.
405 -- R_No_Msg R_E R_Pe R_Ce R_Se
407 -- +--+ +--+ +---+ | +---+
409 -- R_E_No_Defer(i) R_W_Msg(i) R_W_Loc
411 -- +------------+ | +-----------+ +--+
413 -- | | | Set_E_C_Msg(i)
415 -- Raise_Current_Excep
418 pragma No_Return (Reraise);
419 pragma Export (C, Reraise, "__gnat_reraise");
420 -- Reraises the exception referenced by the Current_Excep field of
421 -- the TSD (all fields of this exception occurrence are set). Abort
422 -- is deferred before the reraise operation.
424 -- Save_Occurrence variations: As the management of the private data
425 -- attached to occurrences is delicate, wether or not pointers to such
426 -- data has to be copied in various situations is better made explicit.
427 -- The following procedures provide an internal interface to help making
430 procedure Save_Occurrence_And_Private
431 (Target : out Exception_Occurrence;
432 Source : Exception_Occurrence);
433 -- Copy all the components of Source to Target as well as the
434 -- Private_Data pointer.
436 procedure Save_Occurrence_No_Private
437 (Target : out Exception_Occurrence;
438 Source : Exception_Occurrence);
439 -- Copy all the components of Source to Target, except the
440 -- Private_Data pointer.
442 procedure Transfer_Occurrence
443 (Target : Exception_Occurrence_Access;
444 Source : Exception_Occurrence);
445 pragma Export (C, Transfer_Occurrence, "__gnat_transfer_occurrence");
446 -- Called from System.Tasking.RendezVous.Exceptional_Complete_RendezVous
447 -- to setup Target from Source as an exception to be propagated in the
448 -- caller task. Target is expected to be a pointer to the fixed TSD
449 -- occurrence for this task.
451 -----------------------------
452 -- Run-Time Check Routines --
453 -----------------------------
455 -- These routines are called from the runtime to raise a specific
456 -- exception with a reason message attached. The parameters are
457 -- the file name and line number in each case. The names are keyed
458 -- to the codes defined in Types.ads and a-types.h (for example,
459 -- the name Rcheck_05 refers to the Reason whose Pos code is 5).
461 procedure Rcheck_00 (File : Big_String_Ptr; Line : Integer);
462 procedure Rcheck_01 (File : Big_String_Ptr; Line : Integer);
463 procedure Rcheck_02 (File : Big_String_Ptr; Line : Integer);
464 procedure Rcheck_03 (File : Big_String_Ptr; Line : Integer);
465 procedure Rcheck_04 (File : Big_String_Ptr; Line : Integer);
466 procedure Rcheck_05 (File : Big_String_Ptr; Line : Integer);
467 procedure Rcheck_06 (File : Big_String_Ptr; Line : Integer);
468 procedure Rcheck_07 (File : Big_String_Ptr; Line : Integer);
469 procedure Rcheck_08 (File : Big_String_Ptr; Line : Integer);
470 procedure Rcheck_09 (File : Big_String_Ptr; Line : Integer);
471 procedure Rcheck_10 (File : Big_String_Ptr; Line : Integer);
472 procedure Rcheck_11 (File : Big_String_Ptr; Line : Integer);
473 procedure Rcheck_12 (File : Big_String_Ptr; Line : Integer);
474 procedure Rcheck_13 (File : Big_String_Ptr; Line : Integer);
475 procedure Rcheck_14 (File : Big_String_Ptr; Line : Integer);
476 procedure Rcheck_15 (File : Big_String_Ptr; Line : Integer);
477 procedure Rcheck_16 (File : Big_String_Ptr; Line : Integer);
478 procedure Rcheck_17 (File : Big_String_Ptr; Line : Integer);
479 procedure Rcheck_18 (File : Big_String_Ptr; Line : Integer);
480 procedure Rcheck_19 (File : Big_String_Ptr; Line : Integer);
481 procedure Rcheck_20 (File : Big_String_Ptr; Line : Integer);
482 procedure Rcheck_21 (File : Big_String_Ptr; Line : Integer);
483 procedure Rcheck_22 (File : Big_String_Ptr; Line : Integer);
484 procedure Rcheck_23 (File : Big_String_Ptr; Line : Integer);
485 procedure Rcheck_24 (File : Big_String_Ptr; Line : Integer);
486 procedure Rcheck_25 (File : Big_String_Ptr; Line : Integer);
487 procedure Rcheck_26 (File : Big_String_Ptr; Line : Integer);
488 procedure Rcheck_27 (File : Big_String_Ptr; Line : Integer);
489 procedure Rcheck_28 (File : Big_String_Ptr; Line : Integer);
490 procedure Rcheck_29 (File : Big_String_Ptr; Line : Integer);
492 pragma Export (C, Rcheck_00, "__gnat_rcheck_00");
493 pragma Export (C, Rcheck_01, "__gnat_rcheck_01");
494 pragma Export (C, Rcheck_02, "__gnat_rcheck_02");
495 pragma Export (C, Rcheck_03, "__gnat_rcheck_03");
496 pragma Export (C, Rcheck_04, "__gnat_rcheck_04");
497 pragma Export (C, Rcheck_05, "__gnat_rcheck_05");
498 pragma Export (C, Rcheck_06, "__gnat_rcheck_06");
499 pragma Export (C, Rcheck_07, "__gnat_rcheck_07");
500 pragma Export (C, Rcheck_08, "__gnat_rcheck_08");
501 pragma Export (C, Rcheck_09, "__gnat_rcheck_09");
502 pragma Export (C, Rcheck_10, "__gnat_rcheck_10");
503 pragma Export (C, Rcheck_11, "__gnat_rcheck_11");
504 pragma Export (C, Rcheck_12, "__gnat_rcheck_12");
505 pragma Export (C, Rcheck_13, "__gnat_rcheck_13");
506 pragma Export (C, Rcheck_14, "__gnat_rcheck_14");
507 pragma Export (C, Rcheck_15, "__gnat_rcheck_15");
508 pragma Export (C, Rcheck_16, "__gnat_rcheck_16");
509 pragma Export (C, Rcheck_17, "__gnat_rcheck_17");
510 pragma Export (C, Rcheck_18, "__gnat_rcheck_18");
511 pragma Export (C, Rcheck_19, "__gnat_rcheck_19");
512 pragma Export (C, Rcheck_20, "__gnat_rcheck_20");
513 pragma Export (C, Rcheck_21, "__gnat_rcheck_21");
514 pragma Export (C, Rcheck_22, "__gnat_rcheck_22");
515 pragma Export (C, Rcheck_23, "__gnat_rcheck_23");
516 pragma Export (C, Rcheck_24, "__gnat_rcheck_24");
517 pragma Export (C, Rcheck_25, "__gnat_rcheck_25");
518 pragma Export (C, Rcheck_26, "__gnat_rcheck_26");
519 pragma Export (C, Rcheck_27, "__gnat_rcheck_27");
520 pragma Export (C, Rcheck_28, "__gnat_rcheck_28");
521 pragma Export (C, Rcheck_29, "__gnat_rcheck_29");
523 ---------------------------------------------
524 -- Reason Strings for Run-Time Check Calls --
525 ---------------------------------------------
527 -- These strings are null-terminated and are used by Rcheck_nn. The
528 -- strings correspond to the definitions for Types.RT_Exception_Code.
532 Rmsg_00 : constant String := "access check failed" & NUL;
533 Rmsg_01 : constant String := "access parameter is null" & NUL;
534 Rmsg_02 : constant String := "discriminant check failed" & NUL;
535 Rmsg_03 : constant String := "divide by zero" & NUL;
536 Rmsg_04 : constant String := "explicit raise" & NUL;
537 Rmsg_05 : constant String := "index check failed" & NUL;
538 Rmsg_06 : constant String := "invalid data" & NUL;
539 Rmsg_07 : constant String := "length check failed" & NUL;
540 Rmsg_08 : constant String := "overflow check failed" & NUL;
541 Rmsg_09 : constant String := "partition check failed" & NUL;
542 Rmsg_10 : constant String := "range check failed" & NUL;
543 Rmsg_11 : constant String := "tag check failed" & NUL;
544 Rmsg_12 : constant String := "access before elaboration" & NUL;
545 Rmsg_13 : constant String := "accessibility check failed" & NUL;
546 Rmsg_14 : constant String := "all guards closed" & NUL;
547 Rmsg_15 : constant String := "duplicated entry address" & NUL;
548 Rmsg_16 : constant String := "explicit raise" & NUL;
549 Rmsg_17 : constant String := "finalize/adjust raised exception" & NUL;
550 Rmsg_18 : constant String := "misaligned address value" & NUL;
551 Rmsg_19 : constant String := "missing return" & NUL;
552 Rmsg_20 : constant String := "overlaid controlled object" & NUL;
553 Rmsg_21 : constant String := "potentially blocking operation" & NUL;
554 Rmsg_22 : constant String := "stubbed subprogram called" & NUL;
555 Rmsg_23 : constant String := "unchecked union restriction" & NUL;
556 Rmsg_24 : constant String := "illegal use of"
557 & " remote access-to-class-wide type, see RM E.4(18)" & NUL;
558 Rmsg_25 : constant String := "empty storage pool" & NUL;
559 Rmsg_26 : constant String := "explicit raise" & NUL;
560 Rmsg_27 : constant String := "infinite recursion" & NUL;
561 Rmsg_28 : constant String := "object too large" & NUL;
562 Rmsg_29 : constant String := "restriction violation" & NUL;
564 -----------------------
565 -- Polling Interface --
566 -----------------------
568 type Unsigned is mod 2 ** 32;
570 Counter : Unsigned := 0;
571 pragma Warnings (Off, Counter);
572 -- This counter is provided for convenience. It can be used in Poll to
573 -- perform periodic but not systematic operations.
575 procedure Poll is separate;
576 -- The actual polling routine is separate, so that it can easily
577 -- be replaced with a target dependent version.
583 -- This dummy procedure gives us the start of the PC range for addresses
584 -- within the exception unit itself. We hope that gigi/gcc keep all the
585 -- procedures in their original order!
590 Code_Address_For_AAA := Start_Of_AAA'Address;
597 procedure Call_Chain (Excep : EOA) is separate;
598 -- The actual Call_Chain routine is separate, so that it can easily
599 -- be dummied out when no exception traceback information is needed.
601 ------------------------------
602 -- Current_Target_Exception --
603 ------------------------------
605 function Current_Target_Exception return Exception_Occurrence is
607 return Null_Occurrence;
608 end Current_Target_Exception;
614 function EId_To_String (X : Exception_Id) return String
615 renames Stream_Attributes.EId_To_String;
621 -- We use the null string to represent the null occurrence, otherwise
622 -- we output the Exception_Information string for the occurrence.
624 function EO_To_String (X : Exception_Occurrence) return String
625 renames Stream_Attributes.EO_To_String;
627 ------------------------
628 -- Exception_Identity --
629 ------------------------
631 function Exception_Identity
632 (X : Exception_Occurrence)
636 if X.Id = Null_Id then
637 raise Constraint_Error;
641 end Exception_Identity;
643 ---------------------------
644 -- Exception_Information --
645 ---------------------------
647 function Exception_Information (X : Exception_Occurrence) return String
648 renames Exception_Data.Exception_Information;
650 -----------------------
651 -- Exception_Message --
652 -----------------------
654 function Exception_Message (X : Exception_Occurrence) return String is
656 if X.Id = Null_Id then
657 raise Constraint_Error;
660 return X.Msg (1 .. X.Msg_Length);
661 end Exception_Message;
667 function Exception_Name (Id : Exception_Id) return String is
670 raise Constraint_Error;
673 return Id.Full_Name.all (1 .. Id.Name_Length - 1);
676 function Exception_Name (X : Exception_Occurrence) return String is
678 return Exception_Name (X.Id);
681 ---------------------------
682 -- Exception_Name_Simple --
683 ---------------------------
685 function Exception_Name_Simple (X : Exception_Occurrence) return String is
686 Name : constant String := Exception_Name (X);
692 exit when Name (P - 1) = '.';
696 -- Return result making sure lower bound is 1
699 subtype Rname is String (1 .. Name'Length - P + 1);
701 return Rname (Name (P .. Name'Length));
703 end Exception_Name_Simple;
709 package body Exception_Data is separate;
710 -- This package can be easily dummied out if we do not want the
711 -- basic support for exception messages (such as in Ada 83).
713 ---------------------------
714 -- Exception_Propagation --
715 ---------------------------
717 package body Exception_Propagation is separate;
718 -- Depending on the actual exception mechanism used (front-end or
719 -- back-end based), the implementation will differ, which is why this
720 -- package is separated.
722 ----------------------
723 -- Exception_Traces --
724 ----------------------
726 package body Exception_Traces is separate;
727 -- Depending on the underlying support for IO the implementation
728 -- will differ. Moreover we would like to dummy out this package
729 -- in case we do not want any exception tracing support. This is
730 -- why this package is separated.
732 -----------------------
733 -- Stream Attributes --
734 -----------------------
736 package body Stream_Attributes is separate;
737 -- This package can be easily dummied out if we do not want the
738 -- support for streaming Exception_Ids and Exception_Occurrences.
740 -----------------------------
741 -- Process_Raise_Exception --
742 -----------------------------
744 procedure Process_Raise_Exception
746 From_Signal_Handler : Boolean)
748 pragma Inspection_Point (E);
749 -- This is so the debugger can reliably inspect the parameter
751 Jumpbuf_Ptr : constant Address := Get_Jmpbuf_Address.all;
752 Excep : EOA := Get_Current_Excep.all;
755 -- WARNING : There should be no exception handler for this body
756 -- because this would cause gigi to prepend a setup for a new
757 -- jmpbuf to the sequence of statements. We would then always get
758 -- this new buf in Jumpbuf_Ptr instead of the one for the exception
759 -- we are handling, which would completely break the whole design
760 -- of this procedure.
762 -- Processing varies between zero cost and setjmp/lonjmp processing.
764 if Zero_Cost_Exceptions /= 0 then
766 -- Use the front-end tables to propagate if we have them, otherwise
767 -- resort to the GCC back-end alternative. Backtrace computation is
768 -- performed, if required, by the underlying routine. Notifications
769 -- for the debugger are also not performed here, because we do not
770 -- yet know if the exception is handled.
772 Exception_Propagation.Propagate_Exception (From_Signal_Handler);
775 -- Compute the backtrace for this occurrence if the corresponding
776 -- binder option has been set. Call_Chain takes care of the reraise
780 -- We used to only do this if From_Signal_Handler was not set,
781 -- based on the assumption that backtracing from a signal handler
782 -- would not work due to stack layout oddities. However, since
784 -- 1. The flag is never set in tasking programs (Notify_Exception
785 -- performs regular raise statements), and
787 -- 2. No problem has shown up in tasking programs around here so
788 -- far, this turned out to be too strong an assumption.
790 -- As, in addition, the test was
792 -- 1. preventing the production of backtraces in non-tasking
795 -- 2. introducing a behavior inconsistency between
796 -- the tasking and non-tasking cases,
798 -- we have simply removed it.
800 -- If the jump buffer pointer is non-null, transfer control using
801 -- it. Otherwise announce an unhandled exception (note that this
802 -- means that we have no finalizations to do other than at the outer
803 -- level). Perform the necessary notification tasks in both cases.
805 if Jumpbuf_Ptr /= Null_Address then
807 if not Excep.Exception_Raised then
808 Excep.Exception_Raised := True;
809 Exception_Traces.Notify_Handled_Exception;
812 builtin_longjmp (Jumpbuf_Ptr, 1);
815 -- The pragma Inspection point here ensures that the debugger
816 -- can inspect the parameter.
818 pragma Inspection_Point (E);
820 Exception_Traces.Notify_Unhandled_Exception;
821 Exception_Traces.Unhandled_Exception_Terminate;
824 end Process_Raise_Exception;
826 ----------------------------
827 -- Raise_Constraint_Error --
828 ----------------------------
830 procedure Raise_Constraint_Error
831 (File : Big_String_Ptr;
835 Raise_With_Location_And_Msg
836 (Constraint_Error_Def'Access, File, Line);
837 end Raise_Constraint_Error;
839 --------------------------------
840 -- Raise_Constraint_Error_Msg --
841 --------------------------------
843 procedure Raise_Constraint_Error_Msg
844 (File : Big_String_Ptr;
846 Msg : Big_String_Ptr)
849 Raise_With_Location_And_Msg
850 (Constraint_Error_Def'Access, File, Line, Msg);
851 end Raise_Constraint_Error_Msg;
853 -------------------------
854 -- Raise_Current_Excep --
855 -------------------------
857 procedure Raise_Current_Excep (E : Exception_Id) is
858 pragma Inspection_Point (E);
859 -- This is so the debugger can reliably inspect the parameter
861 Process_Raise_Exception (E => E, From_Signal_Handler => False);
862 end Raise_Current_Excep;
864 ---------------------
865 -- Raise_Exception --
866 ---------------------
868 procedure Raise_Exception
870 Message : String := "")
874 Exception_Data.Set_Exception_Msg (E, Message);
876 Raise_Current_Excep (E);
880 ----------------------------
881 -- Raise_Exception_Always --
882 ----------------------------
884 procedure Raise_Exception_Always
886 Message : String := "")
889 Exception_Data.Set_Exception_Msg (E, Message);
891 Raise_Current_Excep (E);
892 end Raise_Exception_Always;
894 -------------------------------
895 -- Raise_From_Signal_Handler --
896 -------------------------------
898 procedure Raise_From_Signal_Handler
903 Exception_Data.Set_Exception_C_Msg (E, M);
905 Process_Raise_Exception (E => E, From_Signal_Handler => True);
906 end Raise_From_Signal_Handler;
908 -------------------------
909 -- Raise_Program_Error --
910 -------------------------
912 procedure Raise_Program_Error
913 (File : Big_String_Ptr;
917 Raise_With_Location_And_Msg
918 (Program_Error_Def'Access, File, Line);
919 end Raise_Program_Error;
921 -----------------------------
922 -- Raise_Program_Error_Msg --
923 -----------------------------
925 procedure Raise_Program_Error_Msg
926 (File : Big_String_Ptr;
928 Msg : Big_String_Ptr)
931 Raise_With_Location_And_Msg
932 (Program_Error_Def'Access, File, Line, Msg);
933 end Raise_Program_Error_Msg;
935 -------------------------
936 -- Raise_Storage_Error --
937 -------------------------
939 procedure Raise_Storage_Error
940 (File : Big_String_Ptr;
944 Raise_With_Location_And_Msg
945 (Storage_Error_Def'Access, File, Line);
946 end Raise_Storage_Error;
948 -----------------------------
949 -- Raise_Storage_Error_Msg --
950 -----------------------------
952 procedure Raise_Storage_Error_Msg
953 (File : Big_String_Ptr;
955 Msg : Big_String_Ptr)
958 Raise_With_Location_And_Msg
959 (Storage_Error_Def'Access, File, Line, Msg);
960 end Raise_Storage_Error_Msg;
962 ---------------------------------
963 -- Raise_With_Location_And_Msg --
964 ---------------------------------
966 procedure Raise_With_Location_And_Msg
970 M : Big_String_Ptr := null)
973 Exception_Data.Set_Exception_C_Msg (E, F, L, M);
975 Raise_Current_Excep (E);
976 end Raise_With_Location_And_Msg;
982 procedure Raise_With_Msg (E : Exception_Id) is
983 Excep : constant EOA := Get_Current_Excep.all;
986 Exception_Propagation.Setup_Exception (Excep, Excep);
988 Excep.Exception_Raised := False;
990 Excep.Num_Tracebacks := 0;
991 Excep.Cleanup_Flag := False;
992 Excep.Pid := Local_Partition_ID;
994 Raise_Current_Excep (E);
997 --------------------------------------
998 -- Calls to Run-Time Check Routines --
999 --------------------------------------
1001 procedure Rcheck_00 (File : Big_String_Ptr; Line : Integer) is
1003 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_00'Address));
1006 procedure Rcheck_01 (File : Big_String_Ptr; Line : Integer) is
1008 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_01'Address));
1011 procedure Rcheck_02 (File : Big_String_Ptr; Line : Integer) is
1013 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_02'Address));
1016 procedure Rcheck_03 (File : Big_String_Ptr; Line : Integer) is
1018 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_03'Address));
1021 procedure Rcheck_04 (File : Big_String_Ptr; Line : Integer) is
1023 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_04'Address));
1026 procedure Rcheck_05 (File : Big_String_Ptr; Line : Integer) is
1028 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_05'Address));
1031 procedure Rcheck_06 (File : Big_String_Ptr; Line : Integer) is
1033 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_06'Address));
1036 procedure Rcheck_07 (File : Big_String_Ptr; Line : Integer) is
1038 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_07'Address));
1041 procedure Rcheck_08 (File : Big_String_Ptr; Line : Integer) is
1043 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_08'Address));
1046 procedure Rcheck_09 (File : Big_String_Ptr; Line : Integer) is
1048 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_09'Address));
1051 procedure Rcheck_10 (File : Big_String_Ptr; Line : Integer) is
1053 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_10'Address));
1056 procedure Rcheck_11 (File : Big_String_Ptr; Line : Integer) is
1058 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_11'Address));
1061 procedure Rcheck_12 (File : Big_String_Ptr; Line : Integer) is
1063 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_12'Address));
1066 procedure Rcheck_13 (File : Big_String_Ptr; Line : Integer) is
1068 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_13'Address));
1071 procedure Rcheck_14 (File : Big_String_Ptr; Line : Integer) is
1073 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_14'Address));
1076 procedure Rcheck_15 (File : Big_String_Ptr; Line : Integer) is
1078 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_15'Address));
1081 procedure Rcheck_16 (File : Big_String_Ptr; Line : Integer) is
1083 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_16'Address));
1086 procedure Rcheck_17 (File : Big_String_Ptr; Line : Integer) is
1088 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_17'Address));
1091 procedure Rcheck_18 (File : Big_String_Ptr; Line : Integer) is
1093 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_18'Address));
1096 procedure Rcheck_19 (File : Big_String_Ptr; Line : Integer) is
1098 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_19'Address));
1101 procedure Rcheck_20 (File : Big_String_Ptr; Line : Integer) is
1103 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_20'Address));
1106 procedure Rcheck_21 (File : Big_String_Ptr; Line : Integer) is
1108 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_21'Address));
1111 procedure Rcheck_22 (File : Big_String_Ptr; Line : Integer) is
1113 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_22'Address));
1116 procedure Rcheck_23 (File : Big_String_Ptr; Line : Integer) is
1118 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_23'Address));
1121 procedure Rcheck_24 (File : Big_String_Ptr; Line : Integer) is
1123 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_24'Address));
1126 procedure Rcheck_25 (File : Big_String_Ptr; Line : Integer) is
1128 Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_25'Address));
1131 procedure Rcheck_26 (File : Big_String_Ptr; Line : Integer) is
1133 Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_26'Address));
1136 procedure Rcheck_27 (File : Big_String_Ptr; Line : Integer) is
1138 Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_27'Address));
1141 procedure Rcheck_28 (File : Big_String_Ptr; Line : Integer) is
1143 Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_28'Address));
1146 procedure Rcheck_29 (File : Big_String_Ptr; Line : Integer) is
1148 Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_29'Address));
1155 procedure Reraise is
1156 Excep : constant EOA := Get_Current_Excep.all;
1160 Exception_Propagation.Setup_Exception (Excep, Excep, Reraised => True);
1161 Raise_Current_Excep (Excep.Id);
1164 ------------------------
1165 -- Reraise_Occurrence --
1166 ------------------------
1168 procedure Reraise_Occurrence (X : Exception_Occurrence) is
1170 if X.Id /= null then
1172 Exception_Propagation.Setup_Exception
1173 (X'Unrestricted_Access, Get_Current_Excep.all, Reraised => True);
1174 Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1175 Raise_Current_Excep (X.Id);
1177 end Reraise_Occurrence;
1179 -------------------------------
1180 -- Reraise_Occurrence_Always --
1181 -------------------------------
1183 procedure Reraise_Occurrence_Always (X : Exception_Occurrence) is
1186 Exception_Propagation.Setup_Exception
1187 (X'Unrestricted_Access, Get_Current_Excep.all, Reraised => True);
1188 Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1189 Raise_Current_Excep (X.Id);
1190 end Reraise_Occurrence_Always;
1192 ---------------------------------
1193 -- Reraise_Occurrence_No_Defer --
1194 ---------------------------------
1196 procedure Reraise_Occurrence_No_Defer (X : Exception_Occurrence) is
1198 Exception_Propagation.Setup_Exception
1199 (X'Unrestricted_Access, Get_Current_Excep.all, Reraised => True);
1200 Save_Occurrence_No_Private (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 Save_Occurrence_No_Private (Target, Source);
1214 end Save_Occurrence;
1216 function Save_Occurrence
1217 (Source : Exception_Occurrence)
1220 Target : EOA := new Exception_Occurrence;
1223 Save_Occurrence (Target.all, Source);
1225 end Save_Occurrence;
1227 --------------------------------
1228 -- Save_Occurrence_And_Private --
1229 --------------------------------
1231 procedure Save_Occurrence_And_Private
1232 (Target : out Exception_Occurrence;
1233 Source : Exception_Occurrence)
1236 Save_Occurrence_No_Private (Target, Source);
1237 Target.Private_Data := Source.Private_Data;
1238 end Save_Occurrence_And_Private;
1240 --------------------------------
1241 -- Save_Occurrence_No_Private --
1242 --------------------------------
1244 procedure Save_Occurrence_No_Private
1245 (Target : out Exception_Occurrence;
1246 Source : Exception_Occurrence)
1249 Target.Id := Source.Id;
1250 Target.Msg_Length := Source.Msg_Length;
1251 Target.Num_Tracebacks := Source.Num_Tracebacks;
1252 Target.Pid := Source.Pid;
1253 Target.Cleanup_Flag := Source.Cleanup_Flag;
1255 Target.Msg (1 .. Target.Msg_Length) :=
1256 Source.Msg (1 .. Target.Msg_Length);
1258 Target.Tracebacks (1 .. Target.Num_Tracebacks) :=
1259 Source.Tracebacks (1 .. Target.Num_Tracebacks);
1260 end Save_Occurrence_No_Private;
1262 -------------------------
1263 -- Transfer_Occurrence --
1264 -------------------------
1266 procedure Transfer_Occurrence
1267 (Target : Exception_Occurrence_Access;
1268 Source : Exception_Occurrence)
1271 -- Setup Target as an exception to be propagated in the calling task
1272 -- (rendezvous-wise), taking care not to clobber the associated private
1273 -- data. Target is expected to be a pointer to the calling task's
1274 -- fixed TSD occurrence, which is very different from Get_Current_Excep
1275 -- here because this subprogram is called from the called task.
1277 Exception_Propagation.Setup_Exception (Target, Target);
1278 Save_Occurrence_No_Private (Target.all, Source);
1279 end Transfer_Occurrence;
1285 function String_To_EId (S : String) return Exception_Id
1286 renames Stream_Attributes.String_To_EId;
1292 function String_To_EO (S : String) return Exception_Occurrence
1293 renames Stream_Attributes.String_To_EO;
1295 ------------------------------
1296 -- Raise_Exception_No_Defer --
1297 ------------------------------
1299 procedure Raise_Exception_No_Defer
1301 Message : String := "")
1304 Exception_Data.Set_Exception_Msg (E, Message);
1306 -- DO NOT CALL Abort_Defer.all; !!!!
1307 -- why not??? would be nice to have more comments here
1309 Raise_Current_Excep (E);
1310 end Raise_Exception_No_Defer;
1316 -- This dummy procedure gives us the end of the PC range for addresses
1317 -- within the exception unit itself. We hope that gigi/gcc keeps all the
1318 -- procedures in their original order!
1323 Code_Address_For_ZZZ := Start_Of_ZZZ'Address;
1327 -- Allocate the Non-Tasking Machine_State
1329 Set_Machine_State_Addr_NT (System.Address (Allocate_Machine_State));
1331 -- Call the AAA/ZZZ routines to setup the code addresses for the
1332 -- bounds of this unit.