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 procedure To_Stderr (S : String);
124 pragma Export (Ada, To_Stderr, "__gnat_to_stderr");
125 -- Little routine to output string to stderr that is also used
126 -- in the tasking run time.
128 procedure To_Stderr (C : Character);
129 pragma Inline (To_Stderr);
130 pragma Export (Ada, To_Stderr, "__gnat_to_stderr_char");
131 -- Little routine to output a character to stderr, used by some of
132 -- the separate units below.
134 package Exception_Data is
136 ---------------------------------
137 -- Exception messages routines --
138 ---------------------------------
140 procedure Set_Exception_C_Msg
142 Msg1 : Big_String_Ptr;
144 Msg2 : Big_String_Ptr := null);
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. Msg1 is a null terminated string which is generated
148 -- as the exception message. If line is non-zero, then a colon and
149 -- the decimal representation of this integer is appended to the
150 -- message. When Msg2 is non-null, a space and this additional null
151 -- terminated string is added to the message.
153 procedure Set_Exception_Msg
156 -- This routine is called to setup the exception referenced by the
157 -- Current_Excep field in the TSD to contain the indicated Id value
158 -- and message. Message is a string which is generated as the
159 -- exception message.
161 --------------------------------------
162 -- Exception information subprogram --
163 --------------------------------------
165 function Exception_Information (X : Exception_Occurrence) return String;
166 -- The format of the exception information is as follows:
168 -- Exception_Name: <exception name> (as in Exception_Name)
169 -- Message: <message> (only if Exception_Message is empty)
170 -- PID=nnnn (only if != 0)
171 -- Call stack traceback locations: (only if at least one location)
172 -- <0xyyyyyyyy 0xyyyyyyyy ...> (is recorded)
174 -- The lines are separated by a ASCII.LF character.
175 -- The nnnn is the partition Id given as decimal digits.
176 -- The 0x... line represents traceback program counter locations, in
177 -- execution order with the first one being the exception location. It
180 -- The Exception_Name and Message lines are omitted in the abort
181 -- signal case, since this is not really an exception.
183 -- !! If the format of the generated string is changed, please note
184 -- !! that an equivalent modification to the routine String_To_EO must
185 -- !! be made to preserve proper functioning of the stream attributes.
187 ---------------------------------------
188 -- Exception backtracing subprograms --
189 ---------------------------------------
191 -- What is automatically output when exception tracing is on is the
192 -- usual exception information with the call chain backtrace possibly
193 -- tailored by a backtrace decorator. Modifying Exception_Information
194 -- itself is not a good idea because the decorated output is completely
195 -- out of control and would break all our code related to the streaming
196 -- of exceptions. We then provide an alternative function to compute
197 -- the possibly tailored output, which is equivalent if no decorator is
200 function Tailored_Exception_Information
201 (X : Exception_Occurrence) return String;
202 -- Exception information to be output in the case of automatic tracing
203 -- requested through GNAT.Exception_Traces.
205 -- This is the same as Exception_Information if no backtrace decorator
206 -- is currently in place. Otherwise, this is Exception_Information with
207 -- the call chain raw addresses replaced by the result of a call to the
208 -- current decorator provided with the call chain addresses.
211 (Ada, Tailored_Exception_Information,
212 "__gnat_tailored_exception_information");
213 -- This is currently used by System.Tasking.Stages.
217 package Exception_Traces is
220 -- Imports Tailored_Exception_Information
222 ----------------------------------------------
223 -- Run-Time Exception Notification Routines --
224 ----------------------------------------------
226 -- These subprograms provide a common run-time interface to trigger the
227 -- actions required when an exception is about to be propagated (e.g.
228 -- user specified actions or output of exception information). They are
229 -- exported to be usable by the Ada exception handling personality
230 -- routine when the GCC 3 mechanism is used.
232 procedure Notify_Handled_Exception;
234 (C, Notify_Handled_Exception, "__gnat_notify_handled_exception");
235 -- This routine is called for a handled occurrence is about to be
238 procedure Notify_Unhandled_Exception;
240 (C, Notify_Unhandled_Exception, "__gnat_notify_unhandled_exception");
241 -- This routine is called when an unhandled occurrence is about to be
244 procedure Unhandled_Exception_Terminate;
245 pragma No_Return (Unhandled_Exception_Terminate);
246 -- This procedure is called to terminate execution following an
247 -- unhandled exception. The exception information, including
248 -- traceback if available is output, and execution is then
249 -- terminated. Note that at the point where this routine is
250 -- called, the stack has typically been destroyed.
252 end Exception_Traces;
254 package Exception_Propagation is
256 use Exception_Traces;
257 -- Imports Notify_Unhandled_Exception and
258 -- Unhandled_Exception_Terminate
260 ------------------------------------
261 -- Exception propagation routines --
262 ------------------------------------
264 procedure Setup_Exception
267 Reraised : Boolean := False);
268 -- Perform the necessary operations to prepare the propagation of Excep
269 -- in a task where Current is the current occurrence. Excep is assumed
270 -- to be a valid (non null) pointer.
272 -- This should be called before any (re-)setting of the current
273 -- occurrence. Any such (re-)setting shall take care *not* to clobber
274 -- the Private_Data component.
276 -- Having Current provided as an argument (instead of retrieving it via
277 -- Get_Current_Excep internally) is required to allow one task to setup
278 -- an exception for another task, which is used by Transfer_Occurrence.
280 procedure Propagate_Exception (From_Signal_Handler : Boolean);
281 pragma No_Return (Propagate_Exception);
282 -- This procedure propagates the exception represented by the occurrence
283 -- referenced by Current_Excep in the TSD for the current task.
285 end Exception_Propagation;
287 package Stream_Attributes is
289 --------------------------------
290 -- Stream attributes routines --
291 --------------------------------
293 function EId_To_String (X : Exception_Id) return String;
294 function String_To_EId (S : String) return Exception_Id;
295 -- Functions for implementing Exception_Id stream attributes
297 function EO_To_String (X : Exception_Occurrence) return String;
298 function String_To_EO (S : String) return Exception_Occurrence;
299 -- Functions for implementing Exception_Occurrence stream
302 end Stream_Attributes;
304 procedure Raise_Current_Excep (E : Exception_Id);
305 pragma No_Return (Raise_Current_Excep);
306 pragma Export (C, Raise_Current_Excep, "__gnat_raise_nodefer_with_msg");
307 -- This is a simple wrapper to Process_Raise_Exception setting the
308 -- From_Signal_Handler argument to False.
310 -- This external name for Raise_Current_Excep is historical, and probably
311 -- should be changed but for now we keep it, because gdb and gigi know
314 procedure Raise_Exception_No_Defer
315 (E : Exception_Id; Message : String := "");
317 (Ada, Raise_Exception_No_Defer,
318 "ada__exceptions__raise_exception_no_defer");
319 pragma No_Return (Raise_Exception_No_Defer);
320 -- Similar to Raise_Exception, but with no abort deferral
322 procedure Raise_With_Msg (E : Exception_Id);
323 pragma No_Return (Raise_With_Msg);
324 pragma Export (C, Raise_With_Msg, "__gnat_raise_with_msg");
325 -- Raises an exception with given exception id value. A message
326 -- is associated with the raise, and has already been stored in the
327 -- exception occurrence referenced by the Current_Excep in the TSD.
328 -- Abort is deferred before the raise call.
330 procedure Raise_With_Location_And_Msg
334 M : Big_String_Ptr := null);
335 pragma No_Return (Raise_With_Location_And_Msg);
336 -- Raise an exception with given exception id value. A filename and line
337 -- number is associated with the raise and is stored in the exception
338 -- occurrence and in addition a string message M is appended to
339 -- this (if M is not null).
341 procedure Raise_Constraint_Error
342 (File : Big_String_Ptr;
344 pragma No_Return (Raise_Constraint_Error);
346 (C, Raise_Constraint_Error, "__gnat_raise_constraint_error");
347 -- Raise constraint error with file:line information
349 procedure Raise_Constraint_Error_Msg
350 (File : Big_String_Ptr;
352 Msg : Big_String_Ptr);
353 pragma No_Return (Raise_Constraint_Error_Msg);
355 (C, Raise_Constraint_Error_Msg, "__gnat_raise_constraint_error_msg");
356 -- Raise constraint error with file:line + msg information
358 procedure Raise_Program_Error
359 (File : Big_String_Ptr;
361 pragma No_Return (Raise_Program_Error);
363 (C, Raise_Program_Error, "__gnat_raise_program_error");
364 -- Raise program error with file:line information
366 procedure Raise_Program_Error_Msg
367 (File : Big_String_Ptr;
369 Msg : Big_String_Ptr);
370 pragma No_Return (Raise_Program_Error_Msg);
372 (C, Raise_Program_Error_Msg, "__gnat_raise_program_error_msg");
373 -- Raise program error with file:line + msg information
375 procedure Raise_Storage_Error
376 (File : Big_String_Ptr;
378 pragma No_Return (Raise_Storage_Error);
380 (C, Raise_Storage_Error, "__gnat_raise_storage_error");
381 -- Raise storage error with file:line information
383 procedure Raise_Storage_Error_Msg
384 (File : Big_String_Ptr;
386 Msg : Big_String_Ptr);
387 pragma No_Return (Raise_Storage_Error_Msg);
389 (C, Raise_Storage_Error_Msg, "__gnat_raise_storage_error_msg");
390 -- Raise storage error with file:line + reason msg information
392 -- The exception raising process and the automatic tracing mechanism rely
393 -- on some careful use of flags attached to the exception occurrence. The
394 -- graph below illustrates the relations between the Raise_ subprograms
395 -- and identifies the points where basic flags such as Exception_Raised
398 -- (i) signs indicate the flags initialization points. R stands for Raise,
399 -- W for With, and E for Exception.
401 -- R_No_Msg R_E R_Pe R_Ce R_Se
403 -- +--+ +--+ +---+ | +---+
405 -- R_E_No_Defer(i) R_W_Msg(i) R_W_Loc
407 -- +------------+ | +-----------+ +--+
409 -- | | | Set_E_C_Msg(i)
411 -- Raise_Current_Excep
414 pragma No_Return (Reraise);
415 pragma Export (C, Reraise, "__gnat_reraise");
416 -- Reraises the exception referenced by the Current_Excep field of
417 -- the TSD (all fields of this exception occurrence are set). Abort
418 -- is deferred before the reraise operation.
420 -- Save_Occurrence variations: As the management of the private data
421 -- attached to occurrences is delicate, wether or not pointers to such
422 -- data has to be copied in various situations is better made explicit.
423 -- The following procedures provide an internal interface to help making
426 procedure Save_Occurrence_And_Private
427 (Target : out Exception_Occurrence;
428 Source : Exception_Occurrence);
429 -- Copy all the components of Source to Target as well as the
430 -- Private_Data pointer.
432 procedure Save_Occurrence_No_Private
433 (Target : out Exception_Occurrence;
434 Source : Exception_Occurrence);
435 -- Copy all the components of Source to Target, except the
436 -- Private_Data pointer.
438 procedure Transfer_Occurrence
439 (Target : Exception_Occurrence_Access;
440 Source : Exception_Occurrence);
441 pragma Export (C, Transfer_Occurrence, "__gnat_transfer_occurrence");
442 -- Called from System.Tasking.RendezVous.Exceptional_Complete_RendezVous
443 -- to setup Target from Source as an exception to be propagated in the
444 -- caller task. Target is expected to be a pointer to the fixed TSD
445 -- occurrence for this task.
447 -----------------------------
448 -- Run-Time Check Routines --
449 -----------------------------
451 -- These routines are called from the runtime to raise a specific
452 -- exception with a reason message attached. The parameters are
453 -- the file name and line number in each case. The names are keyed
454 -- to the codes defined in Types.ads and a-types.h (for example,
455 -- the name Rcheck_05 refers to the Reason whose Pos code is 5).
457 procedure Rcheck_00 (File : Big_String_Ptr; Line : Integer);
458 procedure Rcheck_01 (File : Big_String_Ptr; Line : Integer);
459 procedure Rcheck_02 (File : Big_String_Ptr; Line : Integer);
460 procedure Rcheck_03 (File : Big_String_Ptr; Line : Integer);
461 procedure Rcheck_04 (File : Big_String_Ptr; Line : Integer);
462 procedure Rcheck_05 (File : Big_String_Ptr; Line : Integer);
463 procedure Rcheck_06 (File : Big_String_Ptr; Line : Integer);
464 procedure Rcheck_07 (File : Big_String_Ptr; Line : Integer);
465 procedure Rcheck_08 (File : Big_String_Ptr; Line : Integer);
466 procedure Rcheck_09 (File : Big_String_Ptr; Line : Integer);
467 procedure Rcheck_10 (File : Big_String_Ptr; Line : Integer);
468 procedure Rcheck_11 (File : Big_String_Ptr; Line : Integer);
469 procedure Rcheck_12 (File : Big_String_Ptr; Line : Integer);
470 procedure Rcheck_13 (File : Big_String_Ptr; Line : Integer);
471 procedure Rcheck_14 (File : Big_String_Ptr; Line : Integer);
472 procedure Rcheck_15 (File : Big_String_Ptr; Line : Integer);
473 procedure Rcheck_16 (File : Big_String_Ptr; Line : Integer);
474 procedure Rcheck_17 (File : Big_String_Ptr; Line : Integer);
475 procedure Rcheck_18 (File : Big_String_Ptr; Line : Integer);
476 procedure Rcheck_19 (File : Big_String_Ptr; Line : Integer);
477 procedure Rcheck_20 (File : Big_String_Ptr; Line : Integer);
478 procedure Rcheck_21 (File : Big_String_Ptr; Line : Integer);
479 procedure Rcheck_22 (File : Big_String_Ptr; Line : Integer);
480 procedure Rcheck_23 (File : Big_String_Ptr; Line : Integer);
481 procedure Rcheck_24 (File : Big_String_Ptr; Line : Integer);
482 procedure Rcheck_25 (File : Big_String_Ptr; Line : Integer);
483 procedure Rcheck_26 (File : Big_String_Ptr; Line : Integer);
484 procedure Rcheck_27 (File : Big_String_Ptr; Line : Integer);
485 procedure Rcheck_28 (File : Big_String_Ptr; Line : Integer);
486 procedure Rcheck_29 (File : Big_String_Ptr; Line : Integer);
488 pragma Export (C, Rcheck_00, "__gnat_rcheck_00");
489 pragma Export (C, Rcheck_01, "__gnat_rcheck_01");
490 pragma Export (C, Rcheck_02, "__gnat_rcheck_02");
491 pragma Export (C, Rcheck_03, "__gnat_rcheck_03");
492 pragma Export (C, Rcheck_04, "__gnat_rcheck_04");
493 pragma Export (C, Rcheck_05, "__gnat_rcheck_05");
494 pragma Export (C, Rcheck_06, "__gnat_rcheck_06");
495 pragma Export (C, Rcheck_07, "__gnat_rcheck_07");
496 pragma Export (C, Rcheck_08, "__gnat_rcheck_08");
497 pragma Export (C, Rcheck_09, "__gnat_rcheck_09");
498 pragma Export (C, Rcheck_10, "__gnat_rcheck_10");
499 pragma Export (C, Rcheck_11, "__gnat_rcheck_11");
500 pragma Export (C, Rcheck_12, "__gnat_rcheck_12");
501 pragma Export (C, Rcheck_13, "__gnat_rcheck_13");
502 pragma Export (C, Rcheck_14, "__gnat_rcheck_14");
503 pragma Export (C, Rcheck_15, "__gnat_rcheck_15");
504 pragma Export (C, Rcheck_16, "__gnat_rcheck_16");
505 pragma Export (C, Rcheck_17, "__gnat_rcheck_17");
506 pragma Export (C, Rcheck_18, "__gnat_rcheck_18");
507 pragma Export (C, Rcheck_19, "__gnat_rcheck_19");
508 pragma Export (C, Rcheck_20, "__gnat_rcheck_20");
509 pragma Export (C, Rcheck_21, "__gnat_rcheck_21");
510 pragma Export (C, Rcheck_22, "__gnat_rcheck_22");
511 pragma Export (C, Rcheck_23, "__gnat_rcheck_23");
512 pragma Export (C, Rcheck_24, "__gnat_rcheck_24");
513 pragma Export (C, Rcheck_25, "__gnat_rcheck_25");
514 pragma Export (C, Rcheck_26, "__gnat_rcheck_26");
515 pragma Export (C, Rcheck_27, "__gnat_rcheck_27");
516 pragma Export (C, Rcheck_28, "__gnat_rcheck_28");
517 pragma Export (C, Rcheck_29, "__gnat_rcheck_29");
519 ---------------------------------------------
520 -- Reason Strings for Run-Time Check Calls --
521 ---------------------------------------------
523 -- These strings are null-terminated and are used by Rcheck_nn. The
524 -- strings correspond to the definitions for Types.RT_Exception_Code.
528 Rmsg_00 : constant String := "access check failed" & NUL;
529 Rmsg_01 : constant String := "access parameter is null" & NUL;
530 Rmsg_02 : constant String := "discriminant check failed" & NUL;
531 Rmsg_03 : constant String := "divide by zero" & NUL;
532 Rmsg_04 : constant String := "explicit raise" & NUL;
533 Rmsg_05 : constant String := "index check failed" & NUL;
534 Rmsg_06 : constant String := "invalid data" & NUL;
535 Rmsg_07 : constant String := "length check failed" & NUL;
536 Rmsg_08 : constant String := "overflow check failed" & NUL;
537 Rmsg_09 : constant String := "partition check failed" & NUL;
538 Rmsg_10 : constant String := "range check failed" & NUL;
539 Rmsg_11 : constant String := "tag check failed" & NUL;
540 Rmsg_12 : constant String := "access before elaboration" & NUL;
541 Rmsg_13 : constant String := "accessibility check failed" & NUL;
542 Rmsg_14 : constant String := "all guards closed" & NUL;
543 Rmsg_15 : constant String := "duplicated entry address" & NUL;
544 Rmsg_16 : constant String := "explicit raise" & NUL;
545 Rmsg_17 : constant String := "finalize/adjust raised exception" & NUL;
546 Rmsg_18 : constant String := "misaligned address value" & NUL;
547 Rmsg_19 : constant String := "missing return" & NUL;
548 Rmsg_20 : constant String := "overlaid controlled object" & NUL;
549 Rmsg_21 : constant String := "potentially blocking operation" & NUL;
550 Rmsg_22 : constant String := "stubbed subprogram called" & NUL;
551 Rmsg_23 : constant String := "unchecked union restriction" & NUL;
552 Rmsg_24 : constant String := "illegal use of"
553 & " remote access-to-class-wide type, see RM E.4(18)" & NUL;
554 Rmsg_25 : constant String := "empty storage pool" & NUL;
555 Rmsg_26 : constant String := "explicit raise" & NUL;
556 Rmsg_27 : constant String := "infinite recursion" & NUL;
557 Rmsg_28 : constant String := "object too large" & NUL;
558 Rmsg_29 : constant String := "restriction violation" & NUL;
560 -----------------------
561 -- Polling Interface --
562 -----------------------
564 type Unsigned is mod 2 ** 32;
566 Counter : Unsigned := 0;
567 pragma Warnings (Off, Counter);
568 -- This counter is provided for convenience. It can be used in Poll to
569 -- perform periodic but not systematic operations.
571 procedure Poll is separate;
572 -- The actual polling routine is separate, so that it can easily
573 -- be replaced with a target dependent version.
579 -- This dummy procedure gives us the start of the PC range for addresses
580 -- within the exception unit itself. We hope that gigi/gcc keep all the
581 -- procedures in their original order!
586 Code_Address_For_AAA := Start_Of_AAA'Address;
593 procedure Call_Chain (Excep : EOA) is separate;
594 -- The actual Call_Chain routine is separate, so that it can easily
595 -- be dummied out when no exception traceback information is needed.
597 ------------------------------
598 -- Current_Target_Exception --
599 ------------------------------
601 function Current_Target_Exception return Exception_Occurrence is
603 return Null_Occurrence;
604 end Current_Target_Exception;
610 function EId_To_String (X : Exception_Id) return String
611 renames Stream_Attributes.EId_To_String;
617 -- We use the null string to represent the null occurrence, otherwise
618 -- we output the Exception_Information string for the occurrence.
620 function EO_To_String (X : Exception_Occurrence) return String
621 renames Stream_Attributes.EO_To_String;
623 ------------------------
624 -- Exception_Identity --
625 ------------------------
627 function Exception_Identity
628 (X : Exception_Occurrence)
632 if X.Id = Null_Id then
633 raise Constraint_Error;
637 end Exception_Identity;
639 ---------------------------
640 -- Exception_Information --
641 ---------------------------
643 function Exception_Information (X : Exception_Occurrence) return String is
645 if X.Id = Null_Id then
646 raise Constraint_Error;
649 return Exception_Data.Exception_Information (X);
650 end Exception_Information;
652 -----------------------
653 -- Exception_Message --
654 -----------------------
656 function Exception_Message (X : Exception_Occurrence) return String is
658 if X.Id = Null_Id then
659 raise Constraint_Error;
662 return X.Msg (1 .. X.Msg_Length);
663 end Exception_Message;
669 function Exception_Name (Id : Exception_Id) return String is
672 raise Constraint_Error;
675 return Id.Full_Name.all (1 .. Id.Name_Length - 1);
678 function Exception_Name (X : Exception_Occurrence) return String is
680 return Exception_Name (X.Id);
683 ---------------------------
684 -- Exception_Name_Simple --
685 ---------------------------
687 function Exception_Name_Simple (X : Exception_Occurrence) return String is
688 Name : constant String := Exception_Name (X);
694 exit when Name (P - 1) = '.';
698 -- Return result making sure lower bound is 1
701 subtype Rname is String (1 .. Name'Length - P + 1);
703 return Rname (Name (P .. Name'Length));
705 end Exception_Name_Simple;
711 package body Exception_Data is separate;
712 -- This package can be easily dummied out if we do not want the
713 -- basic support for exception messages (such as in Ada 83).
715 ---------------------------
716 -- Exception_Propagation --
717 ---------------------------
719 package body Exception_Propagation is separate;
720 -- Depending on the actual exception mechanism used (front-end or
721 -- back-end based), the implementation will differ, which is why this
722 -- package is separated.
724 ----------------------
725 -- Exception_Traces --
726 ----------------------
728 package body Exception_Traces is separate;
729 -- Depending on the underlying support for IO the implementation
730 -- will differ. Moreover we would like to dummy out this package
731 -- in case we do not want any exception tracing support. This is
732 -- why this package is separated.
734 -----------------------
735 -- Stream Attributes --
736 -----------------------
738 package body Stream_Attributes is separate;
739 -- This package can be easily dummied out if we do not want the
740 -- support for streaming Exception_Ids and Exception_Occurrences.
742 -----------------------------
743 -- Process_Raise_Exception --
744 -----------------------------
746 procedure Process_Raise_Exception
748 From_Signal_Handler : Boolean)
750 pragma Inspection_Point (E);
751 -- This is so the debugger can reliably inspect the parameter
753 Jumpbuf_Ptr : constant Address := Get_Jmpbuf_Address.all;
754 Excep : EOA := Get_Current_Excep.all;
757 -- WARNING : There should be no exception handler for this body
758 -- because this would cause gigi to prepend a setup for a new
759 -- jmpbuf to the sequence of statements. We would then always get
760 -- this new buf in Jumpbuf_Ptr instead of the one for the exception
761 -- we are handling, which would completely break the whole design
762 -- of this procedure.
764 -- Processing varies between zero cost and setjmp/lonjmp processing.
766 if Zero_Cost_Exceptions /= 0 then
768 -- Use the front-end tables to propagate if we have them, otherwise
769 -- resort to the GCC back-end alternative. Backtrace computation is
770 -- performed, if required, by the underlying routine. Notifications
771 -- for the debugger are also not performed here, because we do not
772 -- yet know if the exception is handled.
774 Exception_Propagation.Propagate_Exception (From_Signal_Handler);
777 -- Compute the backtrace for this occurrence if the corresponding
778 -- binder option has been set. Call_Chain takes care of the reraise
782 -- We used to only do this if From_Signal_Handler was not set,
783 -- based on the assumption that backtracing from a signal handler
784 -- would not work due to stack layout oddities. However, since
786 -- 1. The flag is never set in tasking programs (Notify_Exception
787 -- performs regular raise statements), and
789 -- 2. No problem has shown up in tasking programs around here so
790 -- far, this turned out to be too strong an assumption.
792 -- As, in addition, the test was
794 -- 1. preventing the production of backtraces in non-tasking
797 -- 2. introducing a behavior inconsistency between
798 -- the tasking and non-tasking cases,
800 -- we have simply removed it.
802 -- If the jump buffer pointer is non-null, transfer control using
803 -- it. Otherwise announce an unhandled exception (note that this
804 -- means that we have no finalizations to do other than at the outer
805 -- level). Perform the necessary notification tasks in both cases.
807 if Jumpbuf_Ptr /= Null_Address then
809 if not Excep.Exception_Raised then
810 Excep.Exception_Raised := True;
811 Exception_Traces.Notify_Handled_Exception;
814 builtin_longjmp (Jumpbuf_Ptr, 1);
817 -- The pragma Inspection point here ensures that the debugger
818 -- can inspect the parameter.
820 pragma Inspection_Point (E);
822 Exception_Traces.Notify_Unhandled_Exception;
823 Exception_Traces.Unhandled_Exception_Terminate;
826 end Process_Raise_Exception;
828 ----------------------------
829 -- Raise_Constraint_Error --
830 ----------------------------
832 procedure Raise_Constraint_Error
833 (File : Big_String_Ptr;
837 Raise_With_Location_And_Msg
838 (Constraint_Error_Def'Access, File, Line);
839 end Raise_Constraint_Error;
841 --------------------------------
842 -- Raise_Constraint_Error_Msg --
843 --------------------------------
845 procedure Raise_Constraint_Error_Msg
846 (File : Big_String_Ptr;
848 Msg : Big_String_Ptr)
851 Raise_With_Location_And_Msg
852 (Constraint_Error_Def'Access, File, Line, Msg);
853 end Raise_Constraint_Error_Msg;
855 -------------------------
856 -- Raise_Current_Excep --
857 -------------------------
859 procedure Raise_Current_Excep (E : Exception_Id) is
860 pragma Inspection_Point (E);
861 -- This is so the debugger can reliably inspect the parameter
863 Process_Raise_Exception (E => E, From_Signal_Handler => False);
864 end Raise_Current_Excep;
866 ---------------------
867 -- Raise_Exception --
868 ---------------------
870 procedure Raise_Exception
872 Message : String := "")
876 Exception_Data.Set_Exception_Msg (E, Message);
878 Raise_Current_Excep (E);
882 ----------------------------
883 -- Raise_Exception_Always --
884 ----------------------------
886 procedure Raise_Exception_Always
888 Message : String := "")
891 Exception_Data.Set_Exception_Msg (E, Message);
893 Raise_Current_Excep (E);
894 end Raise_Exception_Always;
896 -------------------------------
897 -- Raise_From_Signal_Handler --
898 -------------------------------
900 procedure Raise_From_Signal_Handler
905 Exception_Data.Set_Exception_C_Msg (E, M);
907 Process_Raise_Exception (E => E, From_Signal_Handler => True);
908 end Raise_From_Signal_Handler;
910 -------------------------
911 -- Raise_Program_Error --
912 -------------------------
914 procedure Raise_Program_Error
915 (File : Big_String_Ptr;
919 Raise_With_Location_And_Msg
920 (Program_Error_Def'Access, File, Line);
921 end Raise_Program_Error;
923 -----------------------------
924 -- Raise_Program_Error_Msg --
925 -----------------------------
927 procedure Raise_Program_Error_Msg
928 (File : Big_String_Ptr;
930 Msg : Big_String_Ptr)
933 Raise_With_Location_And_Msg
934 (Program_Error_Def'Access, File, Line, Msg);
935 end Raise_Program_Error_Msg;
937 -------------------------
938 -- Raise_Storage_Error --
939 -------------------------
941 procedure Raise_Storage_Error
942 (File : Big_String_Ptr;
946 Raise_With_Location_And_Msg
947 (Storage_Error_Def'Access, File, Line);
948 end Raise_Storage_Error;
950 -----------------------------
951 -- Raise_Storage_Error_Msg --
952 -----------------------------
954 procedure Raise_Storage_Error_Msg
955 (File : Big_String_Ptr;
957 Msg : Big_String_Ptr)
960 Raise_With_Location_And_Msg
961 (Storage_Error_Def'Access, File, Line, Msg);
962 end Raise_Storage_Error_Msg;
964 ---------------------------------
965 -- Raise_With_Location_And_Msg --
966 ---------------------------------
968 procedure Raise_With_Location_And_Msg
972 M : Big_String_Ptr := null)
975 Exception_Data.Set_Exception_C_Msg (E, F, L, M);
977 Raise_Current_Excep (E);
978 end Raise_With_Location_And_Msg;
984 procedure Raise_With_Msg (E : Exception_Id) is
985 Excep : constant EOA := Get_Current_Excep.all;
988 Exception_Propagation.Setup_Exception (Excep, Excep);
990 Excep.Exception_Raised := False;
992 Excep.Num_Tracebacks := 0;
993 Excep.Cleanup_Flag := False;
994 Excep.Pid := Local_Partition_ID;
996 Raise_Current_Excep (E);
999 --------------------------------------
1000 -- Calls to Run-Time Check Routines --
1001 --------------------------------------
1003 procedure Rcheck_00 (File : Big_String_Ptr; Line : Integer) is
1005 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_00'Address));
1008 procedure Rcheck_01 (File : Big_String_Ptr; Line : Integer) is
1010 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_01'Address));
1013 procedure Rcheck_02 (File : Big_String_Ptr; Line : Integer) is
1015 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_02'Address));
1018 procedure Rcheck_03 (File : Big_String_Ptr; Line : Integer) is
1020 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_03'Address));
1023 procedure Rcheck_04 (File : Big_String_Ptr; Line : Integer) is
1025 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_04'Address));
1028 procedure Rcheck_05 (File : Big_String_Ptr; Line : Integer) is
1030 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_05'Address));
1033 procedure Rcheck_06 (File : Big_String_Ptr; Line : Integer) is
1035 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_06'Address));
1038 procedure Rcheck_07 (File : Big_String_Ptr; Line : Integer) is
1040 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_07'Address));
1043 procedure Rcheck_08 (File : Big_String_Ptr; Line : Integer) is
1045 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_08'Address));
1048 procedure Rcheck_09 (File : Big_String_Ptr; Line : Integer) is
1050 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_09'Address));
1053 procedure Rcheck_10 (File : Big_String_Ptr; Line : Integer) is
1055 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_10'Address));
1058 procedure Rcheck_11 (File : Big_String_Ptr; Line : Integer) is
1060 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_11'Address));
1063 procedure Rcheck_12 (File : Big_String_Ptr; Line : Integer) is
1065 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_12'Address));
1068 procedure Rcheck_13 (File : Big_String_Ptr; Line : Integer) is
1070 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_13'Address));
1073 procedure Rcheck_14 (File : Big_String_Ptr; Line : Integer) is
1075 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_14'Address));
1078 procedure Rcheck_15 (File : Big_String_Ptr; Line : Integer) is
1080 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_15'Address));
1083 procedure Rcheck_16 (File : Big_String_Ptr; Line : Integer) is
1085 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_16'Address));
1088 procedure Rcheck_17 (File : Big_String_Ptr; Line : Integer) is
1090 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_17'Address));
1093 procedure Rcheck_18 (File : Big_String_Ptr; Line : Integer) is
1095 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_18'Address));
1098 procedure Rcheck_19 (File : Big_String_Ptr; Line : Integer) is
1100 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_19'Address));
1103 procedure Rcheck_20 (File : Big_String_Ptr; Line : Integer) is
1105 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_20'Address));
1108 procedure Rcheck_21 (File : Big_String_Ptr; Line : Integer) is
1110 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_21'Address));
1113 procedure Rcheck_22 (File : Big_String_Ptr; Line : Integer) is
1115 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_22'Address));
1118 procedure Rcheck_23 (File : Big_String_Ptr; Line : Integer) is
1120 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_23'Address));
1123 procedure Rcheck_24 (File : Big_String_Ptr; Line : Integer) is
1125 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_24'Address));
1128 procedure Rcheck_25 (File : Big_String_Ptr; Line : Integer) is
1130 Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_25'Address));
1133 procedure Rcheck_26 (File : Big_String_Ptr; Line : Integer) is
1135 Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_26'Address));
1138 procedure Rcheck_27 (File : Big_String_Ptr; Line : Integer) is
1140 Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_27'Address));
1143 procedure Rcheck_28 (File : Big_String_Ptr; Line : Integer) is
1145 Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_28'Address));
1148 procedure Rcheck_29 (File : Big_String_Ptr; Line : Integer) is
1150 Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_29'Address));
1157 procedure Reraise is
1158 Excep : constant EOA := Get_Current_Excep.all;
1162 Exception_Propagation.Setup_Exception (Excep, Excep, Reraised => True);
1163 Raise_Current_Excep (Excep.Id);
1166 ------------------------
1167 -- Reraise_Occurrence --
1168 ------------------------
1170 procedure Reraise_Occurrence (X : Exception_Occurrence) is
1172 if X.Id /= null then
1174 Exception_Propagation.Setup_Exception
1175 (X'Unrestricted_Access, Get_Current_Excep.all, Reraised => True);
1176 Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1177 Raise_Current_Excep (X.Id);
1179 end Reraise_Occurrence;
1181 -------------------------------
1182 -- Reraise_Occurrence_Always --
1183 -------------------------------
1185 procedure Reraise_Occurrence_Always (X : Exception_Occurrence) is
1188 Exception_Propagation.Setup_Exception
1189 (X'Unrestricted_Access, Get_Current_Excep.all, Reraised => True);
1190 Save_Occurrence_No_Private (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 Exception_Propagation.Setup_Exception
1201 (X'Unrestricted_Access, Get_Current_Excep.all, Reraised => True);
1202 Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1203 Raise_Current_Excep (X.Id);
1204 end Reraise_Occurrence_No_Defer;
1206 ---------------------
1207 -- Save_Occurrence --
1208 ---------------------
1210 procedure Save_Occurrence
1211 (Target : out Exception_Occurrence;
1212 Source : Exception_Occurrence)
1215 Save_Occurrence_No_Private (Target, Source);
1216 end Save_Occurrence;
1218 function Save_Occurrence
1219 (Source : Exception_Occurrence)
1222 Target : EOA := new Exception_Occurrence;
1225 Save_Occurrence (Target.all, Source);
1227 end Save_Occurrence;
1229 --------------------------------
1230 -- Save_Occurrence_And_Private --
1231 --------------------------------
1233 procedure Save_Occurrence_And_Private
1234 (Target : out Exception_Occurrence;
1235 Source : Exception_Occurrence)
1238 Save_Occurrence_No_Private (Target, Source);
1239 Target.Private_Data := Source.Private_Data;
1240 end Save_Occurrence_And_Private;
1242 --------------------------------
1243 -- Save_Occurrence_No_Private --
1244 --------------------------------
1246 procedure Save_Occurrence_No_Private
1247 (Target : out Exception_Occurrence;
1248 Source : Exception_Occurrence)
1251 Target.Id := Source.Id;
1252 Target.Msg_Length := Source.Msg_Length;
1253 Target.Num_Tracebacks := Source.Num_Tracebacks;
1254 Target.Pid := Source.Pid;
1255 Target.Cleanup_Flag := Source.Cleanup_Flag;
1257 Target.Msg (1 .. Target.Msg_Length) :=
1258 Source.Msg (1 .. Target.Msg_Length);
1260 Target.Tracebacks (1 .. Target.Num_Tracebacks) :=
1261 Source.Tracebacks (1 .. Target.Num_Tracebacks);
1262 end Save_Occurrence_No_Private;
1264 -------------------------
1265 -- Transfer_Occurrence --
1266 -------------------------
1268 procedure Transfer_Occurrence
1269 (Target : Exception_Occurrence_Access;
1270 Source : Exception_Occurrence)
1273 -- Setup Target as an exception to be propagated in the calling task
1274 -- (rendezvous-wise), taking care not to clobber the associated private
1275 -- data. Target is expected to be a pointer to the calling task's
1276 -- fixed TSD occurrence, which is very different from Get_Current_Excep
1277 -- here because this subprogram is called from the called task.
1279 Exception_Propagation.Setup_Exception (Target, Target);
1280 Save_Occurrence_No_Private (Target.all, Source);
1281 end Transfer_Occurrence;
1287 function String_To_EId (S : String) return Exception_Id
1288 renames Stream_Attributes.String_To_EId;
1294 function String_To_EO (S : String) return Exception_Occurrence
1295 renames Stream_Attributes.String_To_EO;
1297 ------------------------------
1298 -- Raise_Exception_No_Defer --
1299 ------------------------------
1301 procedure Raise_Exception_No_Defer
1303 Message : String := "")
1306 Exception_Data.Set_Exception_Msg (E, Message);
1308 -- DO NOT CALL Abort_Defer.all; !!!!
1309 -- why not??? would be nice to have more comments here
1311 Raise_Current_Excep (E);
1312 end Raise_Exception_No_Defer;
1318 procedure To_Stderr (C : Character) is
1320 type int is new Integer;
1322 procedure put_char_stderr (C : int);
1323 pragma Import (C, put_char_stderr, "put_char_stderr");
1326 put_char_stderr (Character'Pos (C));
1329 procedure To_Stderr (S : String) is
1331 for J in S'Range loop
1332 if S (J) /= ASCII.CR then
1342 -- This dummy procedure gives us the end of the PC range for addresses
1343 -- within the exception unit itself. We hope that gigi/gcc keeps all the
1344 -- procedures in their original order!
1349 Code_Address_For_ZZZ := Start_Of_ZZZ'Address;
1353 -- Allocate the Non-Tasking Machine_State
1355 Set_Machine_State_Addr_NT (System.Address (Allocate_Machine_State));
1357 -- Call the AAA/ZZZ routines to setup the code addresses for the
1358 -- bounds of this unit.