| blob | 30393145309d40c323f2410ce4628b12a2502434 |
1 ------------------------------------------------------------------------------
2 -- --
3 -- GNAT COMPILER COMPONENTS --
4 -- --
5 -- A D A . E X C E P T I O N S --
6 -- --
7 -- B o d y --
8 -- --
9 -- Copyright (C) 1992-2002 Free Software Foundation, Inc. --
10 -- --
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. --
21 -- --
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. --
28 -- --
29 -- GNAT was originally developed by the GNAT team at New York University. --
30 -- Extensive contributions were provided by Ada Core Technologies Inc. --
31 -- --
32 ------------------------------------------------------------------------------
35 -- We must turn polling off for this unit, because otherwise we get
36 -- elaboration circularities with System.Exception_Tables.
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.
68 -- This location is initialized by Register_Exceptions to point to a
69 -- list of pointers to procedure descriptors, sorted into ascending
70 -- order of PC addresses.
71 --
72 -- Note that SDP_Table_Build is called *before* this unit (or any
73 -- other unit) is elaborated. That's important, because exceptions can
74 -- and do occur during elaboration of units, and must be handled during
75 -- elaboration. This means that we are counting on the fact that the
76 -- initialization of Subprogram_Descriptors to null is done by the
77 -- load process and NOT by an explicit assignment during elaboration.
80 -- Number of subprogram descriptors, the useful descriptors are stored
81 -- in Subprogram_Descriptors (1 .. Num_Subprogram_Descriptors). There
82 -- can be unused entries at the end of the array due to elimination of
83 -- duplicated entries (which can arise from use of pragma Import).
87 -- Boolean indicating whether tracebacks should be stored in exception
88 -- occurrences.
92 -- Boolean indicating if we are handling exceptions using a zero cost
93 -- mechanism.
94 --
95 -- ??? We currently have two alternatives for this scheme : one using
96 -- front-end tables and one using back-end tables. The former is known to
97 -- only work for GNAT3 and the latter is known to only work for GNAT5.
98 -- Both are present in this implementation and it would be good to have
99 -- separate bodies at some point.
100 --
101 -- Note that although we currently do not support it, the GCC3 back-end
102 -- tables are also potentially useable for setjmp/longjmp processing.
105 -- Convenient shortcut
107 ------------------------------------------------
108 -- Entities to interface with the GCC runtime --
109 ------------------------------------------------
111 -- These come from "C++ ABI for Itanium : Exception handling", which is
112 -- the reference for GCC. They are used only when we are relying on
113 -- back-end tables for exception propagation, which in turn is currenly
114 -- only the case for Zero_Cost_Exceptions in GNAT5.
116 -- Return codes from the GCC runtime functions used to propagate
117 -- an exception.
119 type Unwind_Reason_Code is
120 (URC_NO_REASON,
121 URC_FOREIGN_EXCEPTION_CAUGHT,
122 URC_PHASE2_ERROR,
123 URC_PHASE1_ERROR,
124 URC_NORMAL_STOP,
125 URC_END_OF_STACK,
126 URC_HANDLER_FOUND,
127 URC_INSTALL_CONTEXT,
128 URC_CONTINUE_UNWIND);
130 -- ??? pragma Unreferenced is unknown until 3.15, so we need to disable
131 -- warnings around it to fix the bootstrap path.
133 pragma Warnings (Off);
134 pragma Unreferenced
135 (URC_NO_REASON,
136 URC_FOREIGN_EXCEPTION_CAUGHT,
137 URC_PHASE2_ERROR,
138 URC_PHASE1_ERROR,
139 URC_NORMAL_STOP,
140 URC_END_OF_STACK,
141 URC_HANDLER_FOUND,
142 URC_INSTALL_CONTEXT,
143 URC_CONTINUE_UNWIND);
144 pragma Warnings (On);
146 pragma Convention (C, Unwind_Reason_Code);
148 -- Mandatory common header for any exception object handled by the
149 -- GCC unwinding runtime.
151 subtype Exception_Class is String (1 .. 8);
153 GNAT_Exception_Class : constant Exception_Class
154 := "GNU" & ASCII.NUL & "Ada" & ASCII.NUL;
156 type Unwind_Exception is record
157 Class : Exception_Class := GNAT_Exception_Class;
158 Cleanup : System.Address := System.Null_Address;
159 Private1 : Integer;
160 Private2 : Integer;
161 end record;
163 pragma Convention (C, Unwind_Exception);
165 for Unwind_Exception'Alignment use Standard'Maximum_Alignment;
167 -- A GNAT exception object to be dealt with by the personality routine
168 -- called by the GCC unwinding runtime. This structure shall match the
169 -- one in raise.c and is currently experimental as it might be merged
170 -- with the GNAT runtime definition some day.
172 type GNAT_GCC_Exception is record
173 Header : Unwind_Exception;
174 -- Exception header first, as required by the ABI.
176 Id : Exception_Id;
177 -- Usual Exception identifier
179 Handled_By_Others : Boolean;
180 -- Is this exception handled by "when others" ?
182 Has_Cleanup : Boolean;
183 -- Did we see any at-end handler while walking up the stack
184 -- searching for a handler ? This is used to determine if we
185 -- start the propagation again after having tried once without
186 -- finding a true handler for the exception.
188 Select_Cleanups : Boolean;
189 -- Do we consider at-end handlers as legitimate handlers for the
190 -- exception ? This is used to control the propagation process
191 -- as described in Raise_Current_Excep.
192 end record;
194 pragma Convention (C, GNAT_GCC_Exception);
196 -- GCC runtime functions used
198 function Unwind_RaiseException
199 (E : access GNAT_GCC_Exception)
200 return Unwind_Reason_Code;
201 pragma Import (C, Unwind_RaiseException, "__gnat_Unwind_RaiseException");
203 -----------------------
204 -- Local Subprograms --
205 -----------------------
207 -- Note: the exported subprograms in this package body are called directly
208 -- from C clients using the given external name, even though they are not
209 -- technically visible in the Ada sense.
211 procedure AAA;
212 -- Mark start of procedures in this unit
214 procedure ZZZ;
215 -- Mark end of procedures in this package
217 function Address_Image (A : System.Address) return String;
218 -- Returns at string of the form 0xhhhhhhhhh for 32-bit addresses
219 -- or 0xhhhhhhhhhhhhhhhh for 64-bit addresses. Hex characters are
220 -- in lower case.
222 procedure Call_Chain (Excep : EOA);
223 -- Store up to Max_Tracebacks in Excep, corresponding to the current
224 -- call chain.
226 procedure Free
227 is new Ada.Unchecked_Deallocation
228 (Subprogram_Descriptor_List, Subprogram_Descriptor_List_Ptr);
230 procedure Process_Raise_Exception
231 (E : Exception_Id;
232 From_Signal_Handler : Boolean);
233 pragma Inline (Process_Raise_Exception);
234 pragma No_Return (Process_Raise_Exception);
235 -- This is the lowest level raise routine. It raises the exception
236 -- referenced by Current_Excep.all in the TSD, without deferring abort
237 -- (the caller must ensure that abort is deferred on entry).
238 --
239 -- This is actually the common implementation for Raise_Current_Excep and
240 -- Raise_From_Signal_Handler, with a couple of operations inhibited when
241 -- called from the latter. The origin of the call is indicated by the
242 -- From_Signal_Handler argument.
243 --
244 -- The Inline pragma is there for efficiency reasons.
246 procedure Propagate_Exception_With_FE_Support (Mstate : Machine_State);
247 pragma No_Return (Propagate_Exception_With_FE_Support);
248 -- This procedure propagates the exception represented by the occurrence
249 -- referenced by Current_Excep in the TSD for the current task. M is the
250 -- initial machine state, representing the site of the exception raise
251 -- operation.
252 --
253 -- The procedure searches the front end exception tables for an applicable
254 -- handler, calling Pop_Frame as needed. If and when it locates an
255 -- applicable handler, Enter_Handler is called to actually enter this
256 -- handler. If the search is unable to locate an applicable handler,
257 -- execution is terminated by calling Unhandled_Exception_Terminate.
259 procedure Propagate_Exception_With_GCC_Support (Mstate : Machine_State);
260 pragma No_Return (Propagate_Exception_With_GCC_Support);
261 -- This procedure propagates the exception represented by the occurrence
262 -- referenced by Current_Excep in the TSD for the current task. M is the
263 -- initial machine state, representing the site of the exception raise
264 -- operation. It is currently not used and is there for the purpose of
265 -- interface consistency against Propagate_Exception_With_FE_Support.
266 --
267 -- The procedure builds an object suitable for the libgcc processing and
268 -- calls Unwind_RaiseException to actually throw, taking care of handling
269 -- the two phase scheme it implements.
271 procedure Raise_Current_Excep (E : Exception_Id);
272 pragma No_Return (Raise_Current_Excep);
273 pragma Export (C, Raise_Current_Excep, "__gnat_raise_nodefer_with_msg");
274 -- This is a simple wrapper to Process_Raise_Exception setting the
275 -- From_Signal_Handler argument to False.
276 --
277 -- This external name for Raise_Current_Excep is historical, and probably
278 -- should be changed but for now we keep it, because gdb and gigi know
279 -- about it.
281 procedure Raise_Exception_No_Defer
282 (E : Exception_Id; Message : String := "");
283 pragma Export (Ada, Raise_Exception_No_Defer,
284 "ada__exceptions__raise_exception_no_defer");
285 pragma No_Return (Raise_Exception_No_Defer);
286 -- Similar to Raise_Exception, but with no abort deferral
288 procedure Raise_With_Msg (E : Exception_Id);
289 pragma No_Return (Raise_With_Msg);
290 pragma Export (C, Raise_With_Msg, "__gnat_raise_with_msg");
291 -- Raises an exception with given exception id value. A message
292 -- is associated with the raise, and has already been stored in the
293 -- exception occurrence referenced by the Current_Excep in the TSD.
294 -- Abort is deferred before the raise call.
296 procedure Raise_With_Location
297 (E : Exception_Id;
298 F : Big_String_Ptr;
299 L : Integer);
300 pragma No_Return (Raise_With_Location);
301 -- Raise an exception with given exception id value. A filename and line
302 -- number is associated with the raise and is stored in the exception
303 -- occurrence.
305 procedure Raise_With_Location_And_Msg
306 (E : Exception_Id;
307 F : Big_String_Ptr;
308 L : Integer;
309 M : Big_String_Ptr);
310 pragma No_Return (Raise_With_Location_And_Msg);
311 -- Raise an exception with given exception id value. A filename and line
312 -- number is associated with the raise and is stored in the exception
313 -- occurrence and in addition a string message M is appended to this.
315 procedure Raise_Constraint_Error
316 (File : Big_String_Ptr;
317 Line : Integer);
318 pragma No_Return (Raise_Constraint_Error);
319 pragma Export
320 (C, Raise_Constraint_Error, "__gnat_raise_constraint_error");
321 -- Raise constraint error with file:line information
323 procedure Raise_Constraint_Error_Msg
324 (File : Big_String_Ptr;
325 Line : Integer;
326 Msg : Big_String_Ptr);
327 pragma No_Return (Raise_Constraint_Error_Msg);
328 pragma Export
329 (C, Raise_Constraint_Error_Msg, "__gnat_raise_constraint_error_msg");
330 -- Raise constraint error with file:line + msg information
332 procedure Raise_Program_Error
333 (File : Big_String_Ptr;
334 Line : Integer);
335 pragma No_Return (Raise_Program_Error);
336 pragma Export
337 (C, Raise_Program_Error, "__gnat_raise_program_error");
338 -- Raise program error with file:line information
340 procedure Raise_Program_Error_Msg
341 (File : Big_String_Ptr;
342 Line : Integer;
343 Msg : Big_String_Ptr);
344 pragma No_Return (Raise_Program_Error_Msg);
345 pragma Export
346 (C, Raise_Program_Error_Msg, "__gnat_raise_program_error_msg");
347 -- Raise program error with file:line + msg information
349 procedure Raise_Storage_Error
350 (File : Big_String_Ptr;
351 Line : Integer);
352 pragma No_Return (Raise_Storage_Error);
353 pragma Export
354 (C, Raise_Storage_Error, "__gnat_raise_storage_error");
355 -- Raise storage error with file:line information
357 procedure Raise_Storage_Error_Msg
358 (File : Big_String_Ptr;
359 Line : Integer;
360 Msg : Big_String_Ptr);
361 pragma No_Return (Raise_Storage_Error_Msg);
362 pragma Export
363 (C, Raise_Storage_Error_Msg, "__gnat_raise_storage_error_msg");
364 -- Raise storage error with file:line + reason msg information
366 -- The exception raising process and the automatic tracing mechanism rely
367 -- on some careful use of flags attached to the exception occurrence. The
368 -- graph below illustrates the relations between the Raise_ subprograms
369 -- and identifies the points where basic flags such as Exception_Raised
370 -- are initialized.
371 --
372 -- (i) signs indicate the flags initialization points. R stands for Raise,
373 -- W for With, and E for Exception.
374 --
375 -- R_No_Msg R_E R_Pe R_Ce R_Se
376 -- | | | | |
377 -- +--+ +--+ +---+ | +---+
378 -- | | | | |
379 -- R_E_No_Defer(i) R_W_Msg(i) R_W_Loc R_W_C_Msg
380 -- | | | | | |
381 -- +------------+ | +-----------+ +--+ +--+ |
382 -- | | | | | |
383 -- | | | Set_E_C_Msg(i) |
384 -- | | | |
385 -- | | | +--------------------------+
386 -- | | | |
387 -- Raise_Current_Excep
389 procedure Reraise;
390 pragma No_Return (Reraise);
391 pragma Export (C, Reraise, "__gnat_reraise");
392 -- Reraises the exception referenced by the Current_Excep field of
393 -- the TSD (all fields of this exception occurrence are set). Abort
394 -- is deferred before the reraise operation.
396 function SDP_Table_Sort_Lt (Op1, Op2 : Natural) return Boolean;
397 -- Used in call to sort SDP table (SDP_Table_Build), compares two elements
399 procedure SDP_Table_Sort_Move (From : Natural; To : Natural);
400 -- Used in call to sort SDP table (SDP_Table_Build), moves one element
402 procedure Set_Exception_C_Msg
403 (Id : Exception_Id;
404 Msg1 : Big_String_Ptr;
405 Line : Integer := 0;
406 Msg2 : Big_String_Ptr := null);
407 -- This routine is called to setup the exception referenced by the
408 -- Current_Excep field in the TSD to contain the indicated Id value
409 -- and message. Msg1 is a null terminated string which is generated
410 -- as the exception message. If line is non-zero, then a colon and
411 -- the decimal representation of this integer is appended to the
412 -- message. When Msg2 is non-null, a space and this additional null
413 -- terminated string is added to the message.
415 procedure To_Stderr (S : String);
416 pragma Export (Ada, To_Stderr, "__gnat_to_stderr");
417 -- Little routine to output string to stderr that is also used
418 -- in the tasking run time.
420 procedure Unhandled_Exception_Terminate;
421 pragma No_Return (Unhandled_Exception_Terminate);
422 -- This procedure is called to terminate execution following an unhandled
423 -- exception. The exception information, including traceback if available
424 -- is output, and execution is then terminated. Note that at the point
425 -- where this routine is called, the stack has typically been destroyed
427 ---------------------------------
428 -- Debugger Interface Routines --
429 ---------------------------------
431 -- The routines here are null routines that normally have no effect.
432 -- they are provided for the debugger to place breakpoints on their
433 -- entry points to get control on an exception.
435 procedure Notify_Exception
436 (Id : Exception_Id;
437 Handler : Code_Loc;
438 Is_Others : Boolean);
439 pragma Export (C, Notify_Exception, "__gnat_notify_exception");
440 -- This routine is called whenever an exception is signalled. The Id
441 -- parameter is the Exception_Id of the exception being raised. The
442 -- second parameter Handler is Null_Loc if the exception is unhandled,
443 -- and is otherwise the entry point of the handler that will handle
444 -- the exception. Is_Others is True if the handler is an others handler
445 -- and False otherwise. In the unhandled exception case, if possible
446 -- (and certainly if zero cost exception handling is active), the
447 -- stack is still intact when this procedure is called. Note that this
448 -- routine is entered before any finalization handlers are entered if
449 -- the exception is unhandled by a "real" exception handler.
451 procedure Unhandled_Exception;
452 pragma Export (C, Unhandled_Exception, "__gnat_unhandled_exception");
453 -- This routine is called in addition to Notify_Exception in the
454 -- unhandled exception case. The fact that there are two routines
455 -- which are somewhat redundant is historical. Notify_Exception
456 -- certainly is complete enough, but GDB still uses this routine.
458 -----------------------------
459 -- Run-Time Check Routines --
460 -----------------------------
462 -- These routines are called from the runtime to raise a specific
463 -- exception with a reason message attached. The parameters are
464 -- the file name and line number in each case. The names are keyed
465 -- to the codes defined in Types.ads and a-types.h (for example,
466 -- the name Rcheck_05 refers to the Reason whose Pos code is 5).
468 procedure Rcheck_00 (File : Big_String_Ptr; Line : Integer);
469 procedure Rcheck_01 (File : Big_String_Ptr; Line : Integer);
470 procedure Rcheck_02 (File : Big_String_Ptr; Line : Integer);
471 procedure Rcheck_03 (File : Big_String_Ptr; Line : Integer);
472 procedure Rcheck_04 (File : Big_String_Ptr; Line : Integer);
473 procedure Rcheck_05 (File : Big_String_Ptr; Line : Integer);
474 procedure Rcheck_06 (File : Big_String_Ptr; Line : Integer);
475 procedure Rcheck_07 (File : Big_String_Ptr; Line : Integer);
476 procedure Rcheck_08 (File : Big_String_Ptr; Line : Integer);
477 procedure Rcheck_09 (File : Big_String_Ptr; Line : Integer);
478 procedure Rcheck_10 (File : Big_String_Ptr; Line : Integer);
479 procedure Rcheck_11 (File : Big_String_Ptr; Line : Integer);
480 procedure Rcheck_12 (File : Big_String_Ptr; Line : Integer);
481 procedure Rcheck_13 (File : Big_String_Ptr; Line : Integer);
482 procedure Rcheck_14 (File : Big_String_Ptr; Line : Integer);
483 procedure Rcheck_15 (File : Big_String_Ptr; Line : Integer);
484 procedure Rcheck_16 (File : Big_String_Ptr; Line : Integer);
485 procedure Rcheck_17 (File : Big_String_Ptr; Line : Integer);
486 procedure Rcheck_18 (File : Big_String_Ptr; Line : Integer);
487 procedure Rcheck_19 (File : Big_String_Ptr; Line : Integer);
488 procedure Rcheck_20 (File : Big_String_Ptr; Line : Integer);
489 procedure Rcheck_21 (File : Big_String_Ptr; Line : Integer);
490 procedure Rcheck_22 (File : Big_String_Ptr; Line : Integer);
491 procedure Rcheck_23 (File : Big_String_Ptr; Line : Integer);
492 procedure Rcheck_24 (File : Big_String_Ptr; Line : Integer);
493 procedure Rcheck_25 (File : Big_String_Ptr; Line : Integer);
494 procedure Rcheck_26 (File : Big_String_Ptr; Line : Integer);
495 procedure Rcheck_27 (File : Big_String_Ptr; Line : Integer);
496 procedure Rcheck_28 (File : Big_String_Ptr; Line : Integer);
498 pragma Export (C, Rcheck_00, "__gnat_rcheck_00");
499 pragma Export (C, Rcheck_01, "__gnat_rcheck_01");
500 pragma Export (C, Rcheck_02, "__gnat_rcheck_02");
501 pragma Export (C, Rcheck_03, "__gnat_rcheck_03");
502 pragma Export (C, Rcheck_04, "__gnat_rcheck_04");
503 pragma Export (C, Rcheck_05, "__gnat_rcheck_05");
504 pragma Export (C, Rcheck_06, "__gnat_rcheck_06");
505 pragma Export (C, Rcheck_07, "__gnat_rcheck_07");
506 pragma Export (C, Rcheck_08, "__gnat_rcheck_08");
507 pragma Export (C, Rcheck_09, "__gnat_rcheck_09");
508 pragma Export (C, Rcheck_10, "__gnat_rcheck_10");
509 pragma Export (C, Rcheck_11, "__gnat_rcheck_11");
510 pragma Export (C, Rcheck_12, "__gnat_rcheck_12");
511 pragma Export (C, Rcheck_13, "__gnat_rcheck_13");
512 pragma Export (C, Rcheck_14, "__gnat_rcheck_14");
513 pragma Export (C, Rcheck_15, "__gnat_rcheck_15");
514 pragma Export (C, Rcheck_16, "__gnat_rcheck_16");
515 pragma Export (C, Rcheck_17, "__gnat_rcheck_17");
516 pragma Export (C, Rcheck_18, "__gnat_rcheck_18");
517 pragma Export (C, Rcheck_19, "__gnat_rcheck_19");
518 pragma Export (C, Rcheck_20, "__gnat_rcheck_20");
519 pragma Export (C, Rcheck_21, "__gnat_rcheck_21");
520 pragma Export (C, Rcheck_22, "__gnat_rcheck_22");
521 pragma Export (C, Rcheck_23, "__gnat_rcheck_23");
522 pragma Export (C, Rcheck_24, "__gnat_rcheck_24");
523 pragma Export (C, Rcheck_25, "__gnat_rcheck_25");
524 pragma Export (C, Rcheck_26, "__gnat_rcheck_26");
525 pragma Export (C, Rcheck_27, "__gnat_rcheck_27");
526 pragma Export (C, Rcheck_28, "__gnat_rcheck_28");
528 ---------------------------------------------
529 -- Reason Strings for Run-Time Check Calls --
530 ---------------------------------------------
532 -- These strings are null-terminated and are used by Rcheck_nn. The
533 -- strings correspond to the definitions for Types.RT_Exception_Code.
535 use ASCII;
537 Rmsg_00 : constant String := "access check failed" & NUL;
538 Rmsg_01 : constant String := "access parameter is null" & NUL;
539 Rmsg_02 : constant String := "discriminant check failed" & NUL;
540 Rmsg_03 : constant String := "divide by zero" & NUL;
541 Rmsg_04 : constant String := "explicit raise" & NUL;
542 Rmsg_05 : constant String := "index check failed" & NUL;
543 Rmsg_06 : constant String := "invalid data" & NUL;
544 Rmsg_07 : constant String := "length check failed" & NUL;
545 Rmsg_08 : constant String := "overflow check failed" & NUL;
546 Rmsg_09 : constant String := "partition check failed" & NUL;
547 Rmsg_10 : constant String := "range check failed" & NUL;
548 Rmsg_11 : constant String := "tag check failed" & NUL;
549 Rmsg_12 : constant String := "access before elaboration" & NUL;
550 Rmsg_13 : constant String := "accessibility check failed" & NUL;
551 Rmsg_14 : constant String := "all guards closed" & NUL;
552 Rmsg_15 : constant String := "duplicated entry address" & NUL;
553 Rmsg_16 : constant String := "explicit raise" & NUL;
554 Rmsg_17 : constant String := "finalize raised exception" & NUL;
555 Rmsg_18 : constant String := "invalid data" & NUL;
556 Rmsg_19 : constant String := "misaligned address value" & NUL;
557 Rmsg_20 : constant String := "missing return" & NUL;
558 Rmsg_21 : constant String := "potentially blocking operation" & NUL;
559 Rmsg_22 : constant String := "stubbed subprogram called" & NUL;
560 Rmsg_23 : constant String := "unchecked union restriction" & NUL;
561 Rmsg_24 : constant String := "empty storage pool" & NUL;
562 Rmsg_25 : constant String := "explicit raise" & NUL;
563 Rmsg_26 : constant String := "infinite recursion" & NUL;
564 Rmsg_27 : constant String := "object too large" & NUL;
565 Rmsg_28 : constant String := "restriction violation" & NUL;
567 --------------------------------------
568 -- Calls to Run-Time Check Routines --
569 --------------------------------------
571 procedure Rcheck_00 (File : Big_String_Ptr; Line : Integer) is
572 begin
573 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_00'Address));
574 end Rcheck_00;
576 procedure Rcheck_01 (File : Big_String_Ptr; Line : Integer) is
577 begin
578 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_01'Address));
579 end Rcheck_01;
581 procedure Rcheck_02 (File : Big_String_Ptr; Line : Integer) is
582 begin
583 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_02'Address));
584 end Rcheck_02;
586 procedure Rcheck_03 (File : Big_String_Ptr; Line : Integer) is
587 begin
588 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_03'Address));
589 end Rcheck_03;
591 procedure Rcheck_04 (File : Big_String_Ptr; Line : Integer) is
592 begin
593 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_04'Address));
594 end Rcheck_04;
596 procedure Rcheck_05 (File : Big_String_Ptr; Line : Integer) is
597 begin
598 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_05'Address));
599 end Rcheck_05;
601 procedure Rcheck_06 (File : Big_String_Ptr; Line : Integer) is
602 begin
603 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_06'Address));
604 end Rcheck_06;
606 procedure Rcheck_07 (File : Big_String_Ptr; Line : Integer) is
607 begin
608 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_07'Address));
609 end Rcheck_07;
611 procedure Rcheck_08 (File : Big_String_Ptr; Line : Integer) is
612 begin
613 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_08'Address));
614 end Rcheck_08;
616 procedure Rcheck_09 (File : Big_String_Ptr; Line : Integer) is
617 begin
618 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_09'Address));
619 end Rcheck_09;
621 procedure Rcheck_10 (File : Big_String_Ptr; Line : Integer) is
622 begin
623 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_10'Address));
624 end Rcheck_10;
626 procedure Rcheck_11 (File : Big_String_Ptr; Line : Integer) is
627 begin
628 Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_11'Address));
629 end Rcheck_11;
631 procedure Rcheck_12 (File : Big_String_Ptr; Line : Integer) is
632 begin
633 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_12'Address));
634 end Rcheck_12;
636 procedure Rcheck_13 (File : Big_String_Ptr; Line : Integer) is
637 begin
638 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_13'Address));
639 end Rcheck_13;
641 procedure Rcheck_14 (File : Big_String_Ptr; Line : Integer) is
642 begin
643 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_14'Address));
644 end Rcheck_14;
646 procedure Rcheck_15 (File : Big_String_Ptr; Line : Integer) is
647 begin
648 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_15'Address));
649 end Rcheck_15;
651 procedure Rcheck_16 (File : Big_String_Ptr; Line : Integer) is
652 begin
653 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_16'Address));
654 end Rcheck_16;
656 procedure Rcheck_17 (File : Big_String_Ptr; Line : Integer) is
657 begin
658 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_17'Address));
659 end Rcheck_17;
661 procedure Rcheck_18 (File : Big_String_Ptr; Line : Integer) is
662 begin
663 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_18'Address));
664 end Rcheck_18;
666 procedure Rcheck_19 (File : Big_String_Ptr; Line : Integer) is
667 begin
668 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_19'Address));
669 end Rcheck_19;
671 procedure Rcheck_20 (File : Big_String_Ptr; Line : Integer) is
672 begin
673 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_20'Address));
674 end Rcheck_20;
676 procedure Rcheck_21 (File : Big_String_Ptr; Line : Integer) is
677 begin
678 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_21'Address));
679 end Rcheck_21;
681 procedure Rcheck_22 (File : Big_String_Ptr; Line : Integer) is
682 begin
683 Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_22'Address));
684 end Rcheck_22;
686 procedure Rcheck_23 (File : Big_String_Ptr; Line : Integer) is
687 begin
688 Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_23'Address));
689 end Rcheck_23;
691 procedure Rcheck_24 (File : Big_String_Ptr; Line : Integer) is
692 begin
693 Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_24'Address));
694 end Rcheck_24;
696 procedure Rcheck_25 (File : Big_String_Ptr; Line : Integer) is
697 begin
698 Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_25'Address));
699 end Rcheck_25;
701 procedure Rcheck_26 (File : Big_String_Ptr; Line : Integer) is
702 begin
703 Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_26'Address));
704 end Rcheck_26;
706 procedure Rcheck_27 (File : Big_String_Ptr; Line : Integer) is
707 begin
708 Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_27'Address));
709 end Rcheck_27;
711 procedure Rcheck_28 (File : Big_String_Ptr; Line : Integer) is
712 begin
713 Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_28'Address));
714 end Rcheck_28;
716 ---------------------------------------
717 -- Exception backtracing subprograms --
718 ---------------------------------------
720 -- What is automatically output when exception tracing is on basically
721 -- corresponds to the usual exception information, but with the call
722 -- chain backtrace possibly tailored by a backtrace decorator. Modifying
723 -- Exception_Information itself is not a good idea because the decorated
724 -- output is completely out of control and would break all our code
725 -- related to the streaming of exceptions.
726 --
727 -- We then provide an alternative function to Exception_Information to
728 -- compute the possibly tailored output, which is equivalent if no
729 -- decorator is currently set :
731 function Tailored_Exception_Information
732 (X : Exception_Occurrence)
733 return String;
734 -- Exception information to be output in the case of automatic tracing
735 -- requested through GNAT.Exception_Traces.
736 --
737 -- This is the same as Exception_Information if no backtrace decorator
738 -- is currently in place. Otherwise, this is Exception_Information with
739 -- the call chain raw addresses replaced by the result of a call to the
740 -- current decorator provided with the call chain addresses.
742 pragma Export
743 (Ada, Tailored_Exception_Information,
744 "__gnat_tailored_exception_information");
745 -- This function is used within this package but also from within
746 -- System.Tasking.Stages.
747 --
748 -- The output of Exception_Information and Tailored_Exception_Information
749 -- share a common part which was formerly built using local procedures
750 -- within Exception_Information. These procedures have been extracted from
751 -- their original place to be available to Tailored_Exception_Information
752 -- also.
753 --
754 -- Each of these procedures appends some input to an information string
755 -- currently being built. The Ptr argument represents the last position
756 -- in this string at which a character has been written.
758 procedure Append_Info_Nat
759 (N : Natural;
760 Info : in out String;
761 Ptr : in out Natural);
762 -- Append the image of N at the end of the provided information string
764 procedure Append_Info_NL
765 (Info : in out String;
766 Ptr : in out Natural);
767 -- Append a LF at the end of the provided information string
769 procedure Append_Info_String
770 (S : String;
771 Info : in out String;
772 Ptr : in out Natural);
773 -- Append a string at the end of the provided information string
775 -- To build Exception_Information and Tailored_Exception_Information,
776 -- we then use three intermediate functions :
778 function Basic_Exception_Information
779 (X : Exception_Occurrence)
780 return String;
781 -- Returns the basic exception information string associated with a
782 -- given exception occurrence. This is the common part shared by both
783 -- Exception_Information and Tailored_Exception_Infomation.
785 function Basic_Exception_Traceback
786 (X : Exception_Occurrence)
787 return String;
788 -- Returns an image of the complete call chain associated with an
789 -- exception occurrence in its most basic form, that is as a raw sequence
790 -- of hexadecimal binary addresses.
792 function Tailored_Exception_Traceback
793 (X : Exception_Occurrence)
794 return String;
795 -- Returns an image of the complete call chain associated with an
796 -- exception occurrence, either in its basic form if no decorator is
797 -- in place, or as formatted by the decorator otherwise.
799 -- The overall organization of the exception information related code
800 -- is summarized below :
801 --
802 -- Exception_Information
803 -- |
804 -- +-------+--------+
805 -- | |
806 -- Basic_Exc_Info & Basic_Exc_Tback
807 --
808 --
809 -- Tailored_Exception_Information
810 -- |
811 -- +----------+----------+
812 -- | |
813 -- Basic_Exc_Info & Tailored_Exc_Tback
814 -- |
815 -- +-----------+------------+
816 -- | |
817 -- Basic_Exc_Tback Or Tback_Decorator
818 -- if no decorator set otherwise
820 ----------------------------------------------
821 -- Run-Time Exception Notification Routines --
822 ----------------------------------------------
824 -- The notification routines described above are low level "handles" for
825 -- the debugger but what needs to be done at the notification points
826 -- always involves more than just calling one of these routines. The
827 -- routines below provide a common run-time interface for this purpose,
828 -- with variations depending on the handled/not handled status of the
829 -- occurrence. They are exported to be usable by the Ada exception
830 -- handling personality routine when the GCC 3 mechanism is used.
832 procedure Notify_Handled_Exception
833 (Handler : Code_Loc;
834 Is_Others : Boolean;
835 Low_Notify : Boolean);
836 pragma Export (C, Notify_Handled_Exception,
837 "__gnat_notify_handled_exception");
838 -- Routine to call when a handled occurrence is about to be propagated.
839 -- Low_Notify might be set to false to skip the low level debugger
840 -- notification, which is useful when the information it requires is
841 -- not available, like in the SJLJ case.
843 procedure Notify_Unhandled_Exception (Id : Exception_Id);
844 pragma Export (C, Notify_Unhandled_Exception,
845 "__gnat_notify_unhandled_exception");
846 -- Routine to call when an unhandled occurrence is about to be propagated.
848 --------------------------------
849 -- Import Run-Time C Routines --
850 --------------------------------
852 -- The purpose of the following pragma Imports is to ensure that we
853 -- generate appropriate subprogram descriptors for all C routines in
854 -- the standard GNAT library that can raise exceptions. This ensures
855 -- that the exception propagation can properly find these routines
857 pragma Warnings (Off); -- so old compiler does not complain
858 pragma Propagate_Exceptions;
860 procedure Unhandled_Terminate;
861 pragma Import (C, Unhandled_Terminate, "__gnat_unhandled_terminate");
863 -----------------------
864 -- Polling Interface --
865 -----------------------
867 type Unsigned is mod 2 ** 32;
869 Counter : Unsigned := 0;
870 -- This counter is provided for convenience. It can be used in Poll to
871 -- perform periodic but not systematic operations.
873 procedure Poll is separate;
874 -- The actual polling routine is separate, so that it can easily
875 -- be replaced with a target dependent version.
877 ---------
878 -- AAA --
879 ---------
881 -- This dummy procedure gives us the start of the PC range for addresses
882 -- within the exception unit itself. We hope that gigi/gcc keep all the
883 -- procedures in their original order!
885 procedure AAA is
886 begin
887 null;
888 end AAA;
890 -------------------
891 -- Address_Image --
892 -------------------
894 function Address_Image (A : Address) return String is
895 S : String (1 .. 18);
896 P : Natural;
897 N : Integer_Address;
899 H : constant array (Integer range 0 .. 15) of Character :=
900 "0123456789abcdef";
901 begin
902 P := S'Last;
903 N := To_Integer (A);
904 while N /= 0 loop
905 S (P) := H (Integer (N mod 16));
906 P := P - 1;
907 N := N / 16;
908 end loop;
912 return S (P - 1 .. S'Last);
913 end Address_Image;
915 ---------------------
916 -- Append_Info_Nat --
917 ---------------------
919 procedure Append_Info_Nat
920 (N : Natural;
921 Info : in out String;
922 Ptr : in out Natural)
923 is
924 begin
925 if N > 9 then
926 Append_Info_Nat (N / 10, Info, Ptr);
927 end if;
929 Ptr := Ptr + 1;
931 end Append_Info_Nat;
933 --------------------
934 -- Append_Info_NL --
935 --------------------
937 procedure Append_Info_NL
938 (Info : in out String;
939 Ptr : in out Natural)
940 is
941 begin
942 Ptr := Ptr + 1;
943 Info (Ptr) := ASCII.LF;
944 end Append_Info_NL;
946 ------------------------
947 -- Append_Info_String --
948 ------------------------
950 procedure Append_Info_String
951 (S : String;
952 Info : in out String;
953 Ptr : in out Natural)
954 is
955 begin
956 Info (Ptr + 1 .. Ptr + S'Length) := S;
957 Ptr := Ptr + S'Length;
958 end Append_Info_String;
960 ---------------------------------
961 -- Basic_Exception_Information --
962 ---------------------------------
964 function Basic_Exception_Information
965 (X : Exception_Occurrence)
966 return String
967 is
968 Name : constant String := Exception_Name (X);
969 Msg : constant String := Exception_Message (X);
970 -- Exception name and message that are going to be included in the
971 -- information to return, if not empty.
973 Name_Len : constant Natural := Name'Length;
974 Msg_Len : constant Natural := Msg'Length;
975 -- Length of these strings, useful to compute the size of the string
976 -- we have to allocate for the complete result as well as in the body
977 -- of this procedure.
979 Info_Maxlen : constant Natural := 50 + Name_Len + Msg_Len;
980 -- Maximum length of the information string we will build, with :
981 --
982 -- 50 = 16 + 2 for the text associated with the name
983 -- + 9 + 2 for the text associated with the message
984 -- + 5 + 2 for the text associated with the pid
985 -- + 14 for the text image of the pid itself and a margin.
986 --
987 -- This is indeed a maximum since some data may not appear at all if
988 -- not relevant. For example, nothing related to the exception message
989 -- will be there if this message is empty.
990 --
991 -- WARNING : Do not forget to update these numbers if anything
992 -- involved in the computation changes.
994 Info : String (1 .. Info_Maxlen);
995 -- Information string we are going to build, containing the common
996 -- part shared by Exc_Info and Tailored_Exc_Info.
998 Ptr : Natural := 0;
1000 begin
1001 -- Output exception name and message except for _ABORT_SIGNAL, where
1002 -- these two lines are omitted (see discussion above).
1005 Append_Info_String ("Exception name: ", Info, Ptr);
1006 Append_Info_String (Name, Info, Ptr);
1007 Append_Info_NL (Info, Ptr);
1009 if Msg_Len /= 0 then
1010 Append_Info_String ("Message: ", Info, Ptr);
1011 Append_Info_String (Msg, Info, Ptr);
1012 Append_Info_NL (Info, Ptr);
1013 end if;
1014 end if;
1016 -- Output PID line if non-zero
1018 if X.Pid /= 0 then
1019 Append_Info_String ("PID: ", Info, Ptr);
1020 Append_Info_Nat (X.Pid, Info, Ptr);
1021 Append_Info_NL (Info, Ptr);
1022 end if;
1024 return Info (1 .. Ptr);
1025 end Basic_Exception_Information;
1027 -------------------------------
1028 -- Basic_Exception_Traceback --
1029 -------------------------------
1031 function Basic_Exception_Traceback
1032 (X : Exception_Occurrence)
1033 return String
1034 is
1035 Info_Maxlen : constant Natural := 35 + X.Num_Tracebacks * 19;
1036 -- Maximum length of the information string we are building, with :
1037 -- 33 = 31 + 4 for the text before and after the traceback, and
1038 -- 19 = 2 + 16 + 1 for each address ("0x" + HHHH + " ")
1039 --
1040 -- WARNING : Do not forget to update these numbers if anything
1041 -- involved in the computation changes.
1043 Info : String (1 .. Info_Maxlen);
1044 -- Information string we are going to build, containing an image
1045 -- of the call chain associated with the exception occurrence in its
1046 -- most basic form, that is as a sequence of binary addresses.
1048 Ptr : Natural := 0;
1050 begin
1051 if X.Num_Tracebacks > 0 then
1052 Append_Info_String ("Call stack traceback locations:", Info, Ptr);
1053 Append_Info_NL (Info, Ptr);
1055 for J in 1 .. X.Num_Tracebacks loop
1056 Append_Info_String (Address_Image (X.Tracebacks (J)), Info, Ptr);
1057 exit when J = X.Num_Tracebacks;
1058 Append_Info_String (" ", Info, Ptr);
1059 end loop;
1061 Append_Info_NL (Info, Ptr);
1062 end if;
1064 return Info (1 .. Ptr);
1065 end Basic_Exception_Traceback;
1067 -----------------
1068 -- Break_Start --
1069 -----------------
1071 procedure Break_Start is
1072 begin
1073 null;
1074 end Break_Start;
1076 ----------------
1077 -- Call_Chain --
1078 ----------------
1080 procedure Call_Chain (Excep : EOA) is
1081 begin
1082 if Excep.Num_Tracebacks /= 0 then
1083 -- This is a reraise, no need to store a new (wrong) chain.
1084 return;
1085 end if;
1087 System.Traceback.Call_Chain
1088 (Excep.Tracebacks'Address,
1089 Max_Tracebacks,
1090 Excep.Num_Tracebacks,
1091 AAA'Address,
1092 ZZZ'Address);
1093 end Call_Chain;
1095 ------------------------------
1096 -- Current_Target_Exception --
1097 ------------------------------
1099 function Current_Target_Exception return Exception_Occurrence is
1100 begin
1101 return Null_Occurrence;
1102 end Current_Target_Exception;
1104 -------------------
1105 -- EId_To_String --
1106 -------------------
1108 function EId_To_String (X : Exception_Id) return String is
1109 begin
1110 if X = Null_Id then
1111 return "";
1112 else
1113 return Exception_Name (X);
1114 end if;
1115 end EId_To_String;
1117 ------------------
1118 -- EO_To_String --
1119 ------------------
1121 -- We use the null string to represent the null occurrence, otherwise
1122 -- we output the Exception_Information string for the occurrence.
1124 function EO_To_String (X : Exception_Occurrence) return String is
1125 begin
1126 if X.Id = Null_Id then
1127 return "";
1128 else
1129 return Exception_Information (X);
1130 end if;
1131 end EO_To_String;
1133 ------------------------
1134 -- Exception_Identity --
1135 ------------------------
1137 function Exception_Identity
1138 (X : Exception_Occurrence)
1139 return Exception_Id
1140 is
1141 begin
1142 if X.Id = Null_Id then
1143 raise Constraint_Error;
1144 else
1145 return X.Id;
1146 end if;
1147 end Exception_Identity;
1149 ---------------------------
1150 -- Exception_Information --
1151 ---------------------------
1153 -- The format of the string is:
1155 -- Exception_Name: nnnnn
1156 -- Message: mmmmm
1157 -- PID: ppp
1158 -- Call stack traceback locations:
1159 -- 0xhhhh 0xhhhh 0xhhhh ... 0xhhh
1161 -- where
1163 -- nnnn is the fully qualified name of the exception in all upper
1164 -- case letters. This line is always present.
1166 -- mmmm is the message (this line present only if message is non-null)
1168 -- ppp is the Process Id value as a decimal integer (this line is
1169 -- present only if the Process Id is non-zero). Currently we are
1170 -- not making use of this field.
1172 -- The Call stack traceback locations line and the following values
1173 -- are present only if at least one traceback location was recorded.
1174 -- the values are given in C style format, with lower case letters
1175 -- for a-f, and only as many digits present as are necessary.
1177 -- The line terminator sequence at the end of each line, including the
1178 -- last line is a CR-LF sequence (16#0D# followed by 16#0A#).
1180 -- The Exception_Name and Message lines are omitted in the abort
1181 -- signal case, since this is not really an exception, and the only
1182 -- use of this routine is internal for printing termination output.
1184 -- WARNING: if the format of the generated string is changed, please note
1185 -- that an equivalent modification to the routine String_To_EO must be
1186 -- made to preserve proper functioning of the stream attributes.
1188 function Exception_Information (X : Exception_Occurrence) return String is
1190 -- This information is now built using the circuitry introduced in
1191 -- association with the support of traceback decorators, as the
1192 -- catenation of the exception basic information and the call chain
1193 -- backtrace in its basic form.
1195 Basic_Info : constant String := Basic_Exception_Information (X);
1196 Tback_Info : constant String := Basic_Exception_Traceback (X);
1198 Basic_Len : constant Natural := Basic_Info'Length;
1199 Tback_Len : constant Natural := Tback_Info'Length;
1201 Info : String (1 .. Basic_Len + Tback_Len);
1202 Ptr : Natural := 0;
1204 begin
1205 Append_Info_String (Basic_Info, Info, Ptr);
1206 Append_Info_String (Tback_Info, Info, Ptr);
1208 return Info;
1209 end Exception_Information;
1211 -----------------------
1212 -- Exception_Message --
1213 -----------------------
1215 function Exception_Message (X : Exception_Occurrence) return String is
1216 begin
1217 if X.Id = Null_Id then
1218 raise Constraint_Error;
1219 end if;
1221 return X.Msg (1 .. X.Msg_Length);
1222 end Exception_Message;
1224 --------------------
1225 -- Exception_Name --
1226 --------------------
1228 function Exception_Name (Id : Exception_Id) return String is
1229 begin
1230 if Id = null then
1231 raise Constraint_Error;
1232 end if;
1234 return Id.Full_Name.all (1 .. Id.Name_Length - 1);
1235 end Exception_Name;
1237 function Exception_Name (X : Exception_Occurrence) return String is
1238 begin
1239 return Exception_Name (X.Id);
1240 end Exception_Name;
1242 ---------------------------
1243 -- Exception_Name_Simple --
1244 ---------------------------
1246 function Exception_Name_Simple (X : Exception_Occurrence) return String is
1247 Name : constant String := Exception_Name (X);
1248 P : Natural;
1250 begin
1251 P := Name'Length;
1252 while P > 1 loop
1254 P := P - 1;
1255 end loop;
1257 return Name (P .. Name'Length);
1258 end Exception_Name_Simple;
1260 -----------------------------
1261 -- Process_Raise_Exception --
1262 -----------------------------
1264 procedure Process_Raise_Exception
1265 (E : Exception_Id;
1266 From_Signal_Handler : Boolean)
1267 is
1268 pragma Inspection_Point (E);
1269 -- This is so the debugger can reliably inspect the parameter
1271 Jumpbuf_Ptr : constant Address := Get_Jmpbuf_Address.all;
1272 Mstate_Ptr : constant Machine_State :=
1273 Machine_State (Get_Machine_State_Addr.all);
1274 Excep : EOA := Get_Current_Excep.all;
1276 begin
1277 -- WARNING : There should be no exception handler for this body
1278 -- because this would cause gigi to prepend a setup for a new
1279 -- jmpbuf to the sequence of statements. We would then always get
1280 -- this new buf in Jumpbuf_Ptr instead of the one for the exception
1281 -- we are handling, which would completely break the whole design
1282 -- of this procedure.
1284 -- Processing varies between zero cost and setjmp/lonjmp processing.
1286 if Zero_Cost_Exceptions /= 0 then
1288 -- Use the front-end tables to propagate if we have them, otherwise
1289 -- resort to the GCC back-end alternative. The backtrace for the
1290 -- occurrence is stored while walking up the stack, and thus stops
1291 -- in the handler's frame if there is one. Notifications are also
1292 -- not performed here since it is not yet known if the exception is
1293 -- handled.
1295 -- Set the machine state unless we are raising from a signal handler
1296 -- since it has already been set properly in that case.
1298 if not From_Signal_Handler then
1299 Set_Machine_State (Mstate_Ptr);
1300 end if;
1302 if Subprogram_Descriptors /= null then
1303 Propagate_Exception_With_FE_Support (Mstate_Ptr);
1304 else
1305 Propagate_Exception_With_GCC_Support (Mstate_Ptr);
1306 end if;
1308 else
1310 -- Compute the backtrace for this occurrence if the corresponding
1311 -- binder option has been set and we are not raising from a signal
1312 -- handler. Call_Chain takes care of the reraise case.
1314 if not From_Signal_Handler
1315 and then Exception_Tracebacks /= 0
1316 then
1317 Call_Chain (Excep);
1318 end if;
1320 -- If the jump buffer pointer is non-null, transfer control using
1321 -- it. Otherwise announce an unhandled exception (note that this
1322 -- means that we have no finalizations to do other than at the outer
1323 -- level). Perform the necessary notification tasks in both cases.
1325 if Jumpbuf_Ptr /= Null_Address then
1327 if not Excep.Exception_Raised then
1328 Excep.Exception_Raised := True;
1329 Notify_Handled_Exception (Null_Loc, False, False);
1331 -- The low level debugger notification is skipped from the
1332 -- call above because we do not have the necessary information
1333 -- to "feed" it properly.
1335 end if;
1337 builtin_longjmp (Jumpbuf_Ptr, 1);
1339 else
1340 Notify_Unhandled_Exception (E);
1341 Unhandled_Exception_Terminate;
1342 end if;
1343 end if;
1345 end Process_Raise_Exception;
1347 -----------------------------------------
1348 -- Propagate_Exception_With_FE_Support --
1349 -----------------------------------------
1351 procedure Propagate_Exception_With_FE_Support (Mstate : Machine_State) is
1352 Excep : constant EOA := Get_Current_Excep.all;
1353 Loc : Code_Loc;
1354 Lo, Hi : Natural;
1355 Pdesc : Natural;
1356 Hrec : Handler_Record_Ptr;
1357 Info : Subprogram_Info_Type;
1359 type Machine_State_Record is
1360 new Storage_Array (1 .. Machine_State_Length);
1361 for Machine_State_Record'Alignment use Standard'Maximum_Alignment;
1363 procedure Duplicate_Machine_State (Dest, Src : Machine_State);
1364 -- Copy Src into Dest, assuming that a Machine_State is pointing to
1365 -- an area of Machine_State_Length bytes.
1367 procedure Duplicate_Machine_State (Dest, Src : Machine_State) is
1368 type Machine_State_Record_Access is access Machine_State_Record;
1369 function To_MSR is new Unchecked_Conversion
1370 (Machine_State, Machine_State_Record_Access);
1372 begin
1373 To_MSR (Dest).all := To_MSR (Src).all;
1374 end Duplicate_Machine_State;
1376 -- Data for handling the finalization handler case. A simple approach
1377 -- in this routine would simply to unwind stack frames till we find a
1378 -- handler and then enter it. But this is undesirable in the case where
1379 -- we have only finalization handlers, and no "real" handler, i.e. a
1380 -- case where we have an unhandled exception.
1382 -- In this case we prefer to signal unhandled exception with the stack
1383 -- intact, and entering finalization handlers would destroy the stack
1384 -- state. To deal with this, as we unwind the stack, we note the first
1385 -- finalization handler, and remember it in the following variables.
1386 -- We then continue to unwind. If and when we find a "real", i.e. non-
1387 -- finalization handler, then we use these variables to pass control to
1388 -- the finalization handler.
1390 FH_Found : Boolean := False;
1391 -- Set when a finalization handler is found
1393 FH_Mstate : aliased Machine_State_Record;
1394 -- Records the machine state for the finalization handler
1396 FH_Handler : Code_Loc := Null_Address;
1397 -- Record handler address for finalization handler
1399 FH_Num_Trb : Natural := 0;
1400 -- Save number of tracebacks for finalization handler
1402 begin
1403 -- Loop through stack frames as exception propagates
1405 Main_Loop : loop
1406 Loc := Get_Code_Loc (Mstate);
1407 exit Main_Loop when Loc = Null_Loc;
1409 -- Record location unless it is inside this unit. Note: this
1410 -- test should really say Code_Address, but Address is the same
1411 -- as Code_Address for unnested subprograms, and Code_Address
1412 -- would cause a bootstrap problem
1414 if Loc < AAA'Address or else Loc > ZZZ'Address then
1416 -- Record location unless we already recorded max tracebacks
1418 if Excep.Num_Tracebacks /= Max_Tracebacks then
1420 -- Do not record location if it is the return point from
1421 -- a reraise call from within a cleanup handler
1423 if not Excep.Cleanup_Flag then
1424 Excep.Num_Tracebacks := Excep.Num_Tracebacks + 1;
1425 Excep.Tracebacks (Excep.Num_Tracebacks) := Loc;
1427 -- For reraise call from cleanup handler, skip entry and
1428 -- clear the flag so that we will start to record again
1430 else
1431 Excep.Cleanup_Flag := False;
1432 end if;
1433 end if;
1434 end if;
1436 -- Do binary search on procedure table
1438 Lo := 1;
1439 Hi := Num_Subprogram_Descriptors;
1441 -- Binary search loop
1443 loop
1444 Pdesc := (Lo + Hi) / 2;
1446 -- Note that Loc is expected to be the procedure's call point
1447 -- and not the return point.
1449 if Loc < Subprogram_Descriptors (Pdesc).Code then
1450 Hi := Pdesc - 1;
1452 elsif Pdesc < Num_Subprogram_Descriptors
1453 and then Loc > Subprogram_Descriptors (Pdesc + 1).Code
1454 then
1455 Lo := Pdesc + 1;
1457 else
1458 exit;
1459 end if;
1461 -- This happens when the current Loc is completely outside of
1462 -- the range of the program, which usually means that we reached
1463 -- the top level frame (e.g __start). In this case we have an
1464 -- unhandled exception.
1466 exit Main_Loop when Hi < Lo;
1467 end loop;
1469 -- Come here with Subprogram_Descriptors (Pdesc) referencing the
1470 -- procedure descriptor that applies to this PC value. Now do a
1471 -- serial search to see if any handler is applicable to this PC
1472 -- value, and to the exception that we are propagating
1474 for J in 1 .. Subprogram_Descriptors (Pdesc).Num_Handlers loop
1475 Hrec := Subprogram_Descriptors (Pdesc).Handler_Records (J);
1477 if Loc >= Hrec.Lo and then Loc < Hrec.Hi then
1479 -- PC range is applicable, see if handler is for this exception
1481 -- First test for case of "all others" (finalization) handler.
1482 -- We do not enter such a handler until we are sure there is
1483 -- a real handler further up the stack.
1485 if Hrec.Id = All_Others_Id then
1487 -- If this is the first finalization handler, then
1488 -- save the machine state so we can enter it later
1489 -- without having to repeat the search.
1491 if not FH_Found then
1492 FH_Found := True;
1493 Duplicate_Machine_State
1494 (Machine_State (FH_Mstate'Address), Mstate);
1495 FH_Handler := Hrec.Handler;
1496 FH_Num_Trb := Excep.Num_Tracebacks;
1497 end if;
1499 -- Normal (non-finalization exception with matching Id)
1501 elsif Excep.Id = Hrec.Id
1502 or else (Hrec.Id = Others_Id
1503 and not Excep.Id.Not_Handled_By_Others)
1504 then
1505 -- Perform the necessary notification tasks.
1507 Notify_Handled_Exception
1508 (Hrec.Handler, Hrec.Id = Others_Id, True);
1510 -- If we already encountered a finalization handler, then
1511 -- reset the context to that handler, and enter it.
1513 if FH_Found then
1514 Excep.Num_Tracebacks := FH_Num_Trb;
1515 Excep.Cleanup_Flag := True;
1517 Enter_Handler
1518 (Machine_State (FH_Mstate'Address), FH_Handler);
1520 -- If we have not encountered a finalization handler,
1521 -- then enter the current handler.
1523 else
1524 Enter_Handler (Mstate, Hrec.Handler);
1525 end if;
1526 end if;
1527 end if;
1528 end loop;
1530 Info := Subprogram_Descriptors (Pdesc).Subprogram_Info;
1531 exit Main_Loop when Info = No_Info;
1532 Pop_Frame (Mstate, Info);
1533 end loop Main_Loop;
1535 -- Fall through if no "real" exception handler found. First thing is to
1536 -- perform the necessary notification tasks with the stack intact.
1538 Notify_Unhandled_Exception (Excep.Id);
1540 -- If there were finalization handlers, then enter the top one.
1541 -- Just because there is no handler does not mean we don't have
1542 -- to still execute all finalizations and cleanups before
1543 -- terminating. Note that the process of calling cleanups
1544 -- does not disturb the back trace stack, since he same
1545 -- exception occurrence gets reraised, and new traceback
1546 -- entries added as we go along.
1548 if FH_Found then
1549 Excep.Num_Tracebacks := FH_Num_Trb;
1550 Excep.Cleanup_Flag := True;
1551 Enter_Handler (Machine_State (FH_Mstate'Address), FH_Handler);
1552 end if;
1554 -- If no cleanups, then this is the real unhandled termination
1556 Unhandled_Exception_Terminate;
1558 end Propagate_Exception_With_FE_Support;
1560 ------------------------------------------
1561 -- Propagate_Exception_With_GCC_Support --
1562 ------------------------------------------
1564 procedure Propagate_Exception_With_GCC_Support (Mstate : Machine_State) is
1565 Excep : EOA := Get_Current_Excep.all;
1566 This_Exception : aliased GNAT_GCC_Exception;
1567 Status : Unwind_Reason_Code;
1569 begin
1570 -- ??? Nothing is currently done for backtracing purposes. We could
1571 -- have used the personality routine to record the addresses while
1572 -- walking up the stack, but this method has two drawbacks : 1/ the
1573 -- trace is incomplete if the exception is handled since we don't walk
1574 -- up the frame with the handler, and 2/ we will miss frames if the
1575 -- exception propagates through frames for which our personality
1576 -- routine is not called (e.g. if C or C++ frames are on the way).
1578 -- Fill in the useful flags for the personality routine called for each
1579 -- frame via the call to Unwind_RaiseException below.
1581 This_Exception.Id := Excep.Id;
1582 This_Exception.Handled_By_Others := not Excep.Id.Not_Handled_By_Others;
1583 This_Exception.Has_Cleanup := False;
1585 -- We are looking for a regular handler first. If there is one, either
1586 -- it or the first at-end handler before it will be entered. If there
1587 -- is none, control will normally get back to after the call, with
1588 -- Has_Cleanup set to true if at least one at-end handler has been
1589 -- found while walking up the stack.
1591 This_Exception.Select_Cleanups := False;
1593 Status := Unwind_RaiseException (This_Exception'Access);
1595 -- If we get here we know the exception is not handled, as otherwise
1596 -- Unwind_RaiseException arranges for a handler to be entered. We might
1597 -- have met cleanups handlers, though, requiring to start again with
1598 -- the Select_Cleanups flag set to True.
1600 -- Before restarting for cleanups, take the necessary steps to enable
1601 -- the debugger to gain control while the stack is still intact. Flag
1602 -- the occurrence as raised to avoid notifying again in case cleanup
1603 -- handlers are entered later.
1605 if not Excep.Exception_Raised then
1606 Excep.Exception_Raised := True;
1607 Notify_Unhandled_Exception (Excep.Id);
1608 end if;
1610 -- Now raise again selecting cleanups as true handlers. Only do this if
1611 -- we know at least one such handler exists since otherwise we would
1612 -- perform a complete stack upwalk for nothing.
1614 if This_Exception.Has_Cleanup then
1615 This_Exception.Select_Cleanups := True;
1616 Status := Unwind_RaiseException (This_Exception'Access);
1618 -- The first cleanup found is entered. It performs its job, raises
1619 -- the initial exception again, and the flow goes back to the first
1620 -- step above with the stack in a different state.
1621 end if;
1623 -- We get here when there is no handler to be run at all. The debugger
1624 -- has been notified before the second step above.
1626 Unhandled_Exception_Terminate;
1628 end Propagate_Exception_With_GCC_Support;
1630 ----------------------------
1631 -- Raise_Constraint_Error --
1632 ----------------------------
1634 procedure Raise_Constraint_Error
1635 (File : Big_String_Ptr;
1636 Line : Integer)
1637 is
1638 begin
1639 Raise_With_Location (Constraint_Error_Def'Access, File, Line);
1640 end Raise_Constraint_Error;
1642 --------------------------------
1643 -- Raise_Constraint_Error_Msg --
1644 --------------------------------
1646 procedure Raise_Constraint_Error_Msg
1647 (File : Big_String_Ptr;
1648 Line : Integer;
1649 Msg : Big_String_Ptr)
1650 is
1651 begin
1652 Raise_With_Location_And_Msg
1653 (Constraint_Error_Def'Access, File, Line, Msg);
1654 end Raise_Constraint_Error_Msg;
1656 -------------------------
1657 -- Raise_Current_Excep --
1658 -------------------------
1660 procedure Raise_Current_Excep (E : Exception_Id) is
1661 begin
1662 Process_Raise_Exception (E => E, From_Signal_Handler => False);
1663 end Raise_Current_Excep;
1665 ---------------------
1666 -- Raise_Exception --
1667 ---------------------
1669 procedure Raise_Exception
1670 (E : Exception_Id;
1671 Message : String := "")
1672 is
1673 Len : constant Natural :=
1674 Natural'Min (Message'Length, Exception_Msg_Max_Length);
1675 Excep : constant EOA := Get_Current_Excep.all;
1677 begin
1678 if E /= null then
1679 Excep.Msg_Length := Len;
1680 Excep.Msg (1 .. Len) := Message (1 .. Len);
1681 Raise_With_Msg (E);
1682 end if;
1683 end Raise_Exception;
1685 ----------------------------
1686 -- Raise_Exception_Always --
1687 ----------------------------
1689 procedure Raise_Exception_Always
1690 (E : Exception_Id;
1691 Message : String := "")
1692 is
1693 Len : constant Natural :=
1694 Natural'Min (Message'Length, Exception_Msg_Max_Length);
1696 Excep : constant EOA := Get_Current_Excep.all;
1698 begin
1699 Excep.Msg_Length := Len;
1700 Excep.Msg (1 .. Len) := Message (1 .. Len);
1701 Raise_With_Msg (E);
1702 end Raise_Exception_Always;
1704 -------------------------------
1705 -- Raise_From_Signal_Handler --
1706 -------------------------------
1708 procedure Raise_From_Signal_Handler
1709 (E : Exception_Id;
1710 M : Big_String_Ptr)
1711 is
1712 begin
1713 Set_Exception_C_Msg (E, M);
1714 Abort_Defer.all;
1715 Process_Raise_Exception (E => E, From_Signal_Handler => True);
1716 end Raise_From_Signal_Handler;
1718 ------------------
1719 -- Raise_No_Msg --
1720 ------------------
1722 procedure Raise_No_Msg (E : Exception_Id) is
1723 Excep : constant EOA := Get_Current_Excep.all;
1725 begin
1726 Excep.Msg_Length := 0;
1727 Raise_With_Msg (E);
1728 end Raise_No_Msg;
1730 -------------------------
1731 -- Raise_Program_Error --
1732 -------------------------
1734 procedure Raise_Program_Error
1735 (File : Big_String_Ptr;
1736 Line : Integer)
1737 is
1738 begin
1739 Raise_With_Location (Program_Error_Def'Access, File, Line);
1740 end Raise_Program_Error;
1742 -----------------------------
1743 -- Raise_Program_Error_Msg --
1744 -----------------------------
1746 procedure Raise_Program_Error_Msg
1747 (File : Big_String_Ptr;
1748 Line : Integer;
1749 Msg : Big_String_Ptr)
1750 is
1751 begin
1752 Raise_With_Location_And_Msg
1753 (Program_Error_Def'Access, File, Line, Msg);
1754 end Raise_Program_Error_Msg;
1756 -------------------------
1757 -- Raise_Storage_Error --
1758 -------------------------
1760 procedure Raise_Storage_Error
1761 (File : Big_String_Ptr;
1762 Line : Integer)
1763 is
1764 begin
1765 Raise_With_Location (Storage_Error_Def'Access, File, Line);
1766 end Raise_Storage_Error;
1768 -----------------------------
1769 -- Raise_Storage_Error_Msg --
1770 -----------------------------
1772 procedure Raise_Storage_Error_Msg
1773 (File : Big_String_Ptr;
1774 Line : Integer;
1775 Msg : Big_String_Ptr)
1776 is
1777 begin
1778 Raise_With_Location_And_Msg
1779 (Storage_Error_Def'Access, File, Line, Msg);
1780 end Raise_Storage_Error_Msg;
1782 ----------------------
1783 -- Raise_With_C_Msg --
1784 ----------------------
1786 procedure Raise_With_C_Msg
1787 (E : Exception_Id;
1788 M : Big_String_Ptr)
1789 is
1790 begin
1791 Set_Exception_C_Msg (E, M);
1792 Abort_Defer.all;
1793 Raise_Current_Excep (E);
1794 end Raise_With_C_Msg;
1796 -------------------------
1797 -- Raise_With_Location --
1798 -------------------------
1800 procedure Raise_With_Location
1801 (E : Exception_Id;
1802 F : Big_String_Ptr;
1803 L : Integer)
1804 is
1805 begin
1806 Set_Exception_C_Msg (E, F, L);
1807 Abort_Defer.all;
1808 Raise_Current_Excep (E);
1809 end Raise_With_Location;
1811 ---------------------------------
1812 -- Raise_With_Location_And_Msg --
1813 ---------------------------------
1815 procedure Raise_With_Location_And_Msg
1816 (E : Exception_Id;
1817 F : Big_String_Ptr;
1818 L : Integer;
1819 M : Big_String_Ptr)
1820 is
1821 begin
1822 Set_Exception_C_Msg (E, F, L, M);
1823 Abort_Defer.all;
1824 Raise_Current_Excep (E);
1825 end Raise_With_Location_And_Msg;
1827 --------------------
1828 -- Raise_With_Msg --
1829 --------------------
1831 procedure Raise_With_Msg (E : Exception_Id) is
1832 Excep : constant EOA := Get_Current_Excep.all;
1834 begin
1835 Excep.Exception_Raised := False;
1836 Excep.Id := E;
1837 Excep.Num_Tracebacks := 0;
1838 Excep.Cleanup_Flag := False;
1839 Excep.Pid := Local_Partition_ID;
1840 Abort_Defer.all;
1841 Raise_Current_Excep (E);
1842 end Raise_With_Msg;
1844 -------------
1845 -- Reraise --
1846 -------------
1848 procedure Reraise is
1849 Excep : constant EOA := Get_Current_Excep.all;
1851 begin
1852 Abort_Defer.all;
1853 Raise_Current_Excep (Excep.Id);
1854 end Reraise;
1856 ------------------------
1857 -- Reraise_Occurrence --
1858 ------------------------
1860 procedure Reraise_Occurrence (X : Exception_Occurrence) is
1861 begin
1862 if X.Id /= null then
1863 Abort_Defer.all;
1864 Save_Occurrence (Get_Current_Excep.all.all, X);
1865 Raise_Current_Excep (X.Id);
1866 end if;
1867 end Reraise_Occurrence;
1869 -------------------------------
1870 -- Reraise_Occurrence_Always --
1871 -------------------------------
1873 procedure Reraise_Occurrence_Always (X : Exception_Occurrence) is
1874 begin
1875 Abort_Defer.all;
1876 Save_Occurrence (Get_Current_Excep.all.all, X);
1877 Raise_Current_Excep (X.Id);
1878 end Reraise_Occurrence_Always;
1880 ---------------------------------
1881 -- Reraise_Occurrence_No_Defer --
1882 ---------------------------------
1884 procedure Reraise_Occurrence_No_Defer (X : Exception_Occurrence) is
1885 begin
1886 Save_Occurrence (Get_Current_Excep.all.all, X);
1887 Raise_Current_Excep (X.Id);
1888 end Reraise_Occurrence_No_Defer;
1890 ---------------------
1891 -- Save_Occurrence --
1892 ---------------------
1894 procedure Save_Occurrence
1895 (Target : out Exception_Occurrence;
1896 Source : Exception_Occurrence)
1897 is
1898 begin
1899 Target.Id := Source.Id;
1900 Target.Msg_Length := Source.Msg_Length;
1901 Target.Num_Tracebacks := Source.Num_Tracebacks;
1902 Target.Pid := Source.Pid;
1903 Target.Cleanup_Flag := Source.Cleanup_Flag;
1905 Target.Msg (1 .. Target.Msg_Length) :=
1906 Source.Msg (1 .. Target.Msg_Length);
1908 Target.Tracebacks (1 .. Target.Num_Tracebacks) :=
1909 Source.Tracebacks (1 .. Target.Num_Tracebacks);
1910 end Save_Occurrence;
1912 function Save_Occurrence
1913 (Source : Exception_Occurrence)
1914 return EOA
1915 is
1916 Target : EOA := new Exception_Occurrence;
1918 begin
1919 Save_Occurrence (Target.all, Source);
1920 return Target;
1921 end Save_Occurrence;
1923 ---------------------
1924 -- SDP_Table_Build --
1925 ---------------------
1927 procedure SDP_Table_Build
1928 (SDP_Addresses : System.Address;
1929 SDP_Count : Natural;
1930 Elab_Addresses : System.Address;
1931 Elab_Addr_Count : Natural)
1932 is
1933 type SDLP_Array is array (1 .. SDP_Count) of Subprogram_Descriptors_Ptr;
1934 type SDLP_Array_Ptr is access all SDLP_Array;
1936 function To_SDLP_Array_Ptr is new Unchecked_Conversion
1937 (System.Address, SDLP_Array_Ptr);
1939 T : constant SDLP_Array_Ptr := To_SDLP_Array_Ptr (SDP_Addresses);
1941 type Elab_Array is array (1 .. Elab_Addr_Count) of Code_Loc;
1942 type Elab_Array_Ptr is access all Elab_Array;
1944 function To_Elab_Array_Ptr is new Unchecked_Conversion
1945 (System.Address, Elab_Array_Ptr);
1947 EA : constant Elab_Array_Ptr := To_Elab_Array_Ptr (Elab_Addresses);
1949 Ndes : Natural;
1950 Previous_Subprogram_Descriptors : Subprogram_Descriptor_List_Ptr;
1952 begin
1953 -- If first call, then initialize count of subprogram descriptors
1955 if Subprogram_Descriptors = null then
1956 Num_Subprogram_Descriptors := 0;
1957 end if;
1959 -- First count number of subprogram descriptors. This count includes
1960 -- entries with duplicated code addresses (resulting from Import).
1962 Ndes := Num_Subprogram_Descriptors + Elab_Addr_Count;
1963 for J in T'Range loop
1964 Ndes := Ndes + T (J).Count;
1965 end loop;
1967 -- Now, allocate the new table (extra zero'th element is for sort call)
1968 -- after having saved the previous one
1970 Previous_Subprogram_Descriptors := Subprogram_Descriptors;
1971 Subprogram_Descriptors := new Subprogram_Descriptor_List (0 .. Ndes);
1973 -- If there was a previous Subprogram_Descriptors table, copy it back
1974 -- into the new one being built. Then free the memory used for the
1975 -- previous table.
1977 for J in 1 .. Num_Subprogram_Descriptors loop
1978 Subprogram_Descriptors (J) := Previous_Subprogram_Descriptors (J);
1979 end loop;
1981 Free (Previous_Subprogram_Descriptors);
1983 -- Next, append the elaboration routine addresses, building dummy
1984 -- SDP's for them as we go through the list.
1986 Ndes := Num_Subprogram_Descriptors;
1987 for J in EA'Range loop
1988 Ndes := Ndes + 1;
1989 Subprogram_Descriptors (Ndes) := new Subprogram_Descriptor_0;
1991 Subprogram_Descriptors (Ndes).all :=
1992 Subprogram_Descriptor'
1999 -- Now copy in pointers to SDP addresses of application subprograms
2010 -- Now we need to sort the table into ascending PC order
2014 -- Now eliminate duplicate entries. Note that in the case where
2015 -- entries have duplicate code addresses, the code for the Lt
2016 -- routine ensures that the interesting one (i.e. the one with
2017 -- handler entries if there are any) comes first.
2024 then
2033 -----------------------
2034 -- SDP_Table_Sort_Lt --
2035 -----------------------
2041 begin
2048 -- For two descriptors for the same procedure, we want the more
2049 -- interesting one first. A descriptor with an exception handler
2050 -- is more interesting than one without. This happens if the less
2051 -- interesting one came from a pragma Import.
2053 else
2059 --------------------------
2060 -- SDP_Table_Sort_Move --
2061 --------------------------
2064 begin
2068 -------------------------
2069 -- Set_Exception_C_Msg --
2070 -------------------------
2072 procedure Set_Exception_C_Msg
2077 is
2084 begin
2094 loop
2099 -- Append line number if present
2103 -- Compute the number of needed characters
2110 -- If enough characters are available, put the line number
2128 -- Append second message if present
2132 then
2139 loop
2147 -------------------
2148 -- String_To_EId --
2149 -------------------
2152 begin
2155 else
2160 ------------------
2161 -- String_To_EO --
2162 ------------------
2169 -- This is the exception occurrence we will create
2173 -- Signal bad exception occurrence string
2176 -- On entry, To points to last character of previous line of the
2177 -- message, terminated by LF. On return, From .. To are set to
2178 -- specify the next string, or From > To if there are no more lines.
2181 begin
2182 Raise_Exception
2188 begin
2196 Bad_EO;
2199 else
2206 -- Start of processing for String_To_EO
2208 begin
2212 else
2216 Next_String;
2219 Bad_EO;
2224 Next_String;
2228 Bad_EO;
2233 Next_String;
2235 else
2243 Bad_EO;
2254 Next_String;
2261 Bad_EO;
2264 Next_String;
2265 loop
2268 declare
2273 begin
2276 then
2277 Bad_EO;
2278 else
2287 N :=
2291 N :=
2298 else
2299 Bad_EO;
2308 Bad_EO;
2317 -- If an exception was converted to a string, it must have
2318 -- already been raised, so flag it accordingly and we are done.
2325 ----------------------------------
2326 -- Tailored_Exception_Traceback --
2327 ----------------------------------
2329 function Tailored_Exception_Traceback
2332 is
2333 -- We indeed reference the decorator *wrapper* from here and not the
2334 -- decorator itself. The purpose of the local variable Wrapper is to
2335 -- prevent a potential crash by race condition in the code below. The
2336 -- atomicity of this assignment is enforced by pragma Atomic in
2337 -- System.Soft_Links.
2339 -- The potential race condition here, if no local variable was used,
2340 -- relates to the test upon the wrapper's value and the call, which
2341 -- are not performed atomically. With the local variable, potential
2342 -- changes of the wrapper's global value between the test and the
2343 -- call become inoffensive.
2346 Traceback_Decorator_Wrapper;
2348 begin
2351 else
2356 ------------------------------------
2357 -- Tailored_Exception_Information --
2358 ------------------------------------
2360 function Tailored_Exception_Information
2363 is
2364 -- The tailored exception information is simply the basic information
2365 -- associated with the tailored call chain backtrace.
2376 begin
2383 -------------------------
2384 -- Unhandled_Exception --
2385 -------------------------
2388 begin
2392 ----------------------
2393 -- Notify_Exception --
2394 ----------------------
2396 procedure Notify_Exception
2400 is
2401 begin
2405 ------------------------------
2406 -- Notify_Handled_Exception --
2407 ------------------------------
2409 procedure Notify_Handled_Exception
2413 is
2416 begin
2417 -- Notify the debugger that we have found a handler and are about to
2418 -- propagate an exception, but only if specifically told to do so.
2424 -- Output some exception information if necessary, as specified by
2425 -- GNAT.Exception_Traces. Take care not to output information about
2426 -- internal exceptions.
2427 --
2428 -- ??? In the ZCX case, the traceback entries we have at this point
2429 -- only include the ones we stored while walking up the stack *up to
2430 -- the handler*. All the frames above the subprogram in which the
2431 -- handler is found are missing.
2435 then
2444 ------------------------------
2445 -- Notify_Handled_Exception --
2446 ------------------------------
2449 begin
2450 -- Simply perform the two necessary low level notification calls.
2452 Unhandled_Exception;
2457 -----------------------------------
2458 -- Unhandled_Exception_Terminate --
2459 -----------------------------------
2462 -- Used to prevent recursive call to adafinal in the event that
2463 -- adafinal processing itself raises an unhandled exception.
2471 -- This occurrence will be used to display a message after finalization.
2472 -- It is necessary to save a copy here, or else the designated value
2473 -- could be overwritten if an exception is raised during finalization
2474 -- (even if that exception is caught).
2478 -- Start of processing for Unhandled_Exception_Terminate
2480 begin
2481 -- First call adafinal
2488 -- Check for special case of raising _ABORT_SIGNAL, which is not
2489 -- really an exception at all. We recognize this by the fact that
2490 -- it is the only exception whose name starts with underscore.
2497 -- If no tracebacks, we print the unhandled exception in the old style
2498 -- (i.e. the style used before ZCX was implemented). We do this to
2499 -- retain compatibility, especially with the nightly scripts, but
2500 -- this can be removed at some point ???
2514 -- New style, zero cost exception case
2516 else
2517 -- Tailored_Exception_Information is also called here so that the
2518 -- backtrace decorator gets called if it has been set. This is
2519 -- currently required because some paths in Raise_Current_Excep
2520 -- do not go through the calls that display this information.
2521 --
2522 -- Note also that with the current scheme in Raise_Current_Excep
2523 -- we can have this whole information output twice, typically when
2524 -- some handler is found on the call chain but none deals with the
2525 -- occurrence or if this occurrence gets reraised up to here.
2533 -- Perform system dependent shutdown code
2535 declare
2538 pragma Import
2541 begin
2542 Unhandled_Terminate;
2547 ------------------------------
2548 -- Raise_Exception_No_Defer --
2549 ------------------------------
2551 procedure Raise_Exception_No_Defer
2554 is
2560 begin
2569 -- DO NOT CALL Abort_Defer.all; !!!!
2574 ---------------
2575 -- To_Stderr --
2576 ---------------
2582 begin
2590 ---------
2591 -- ZZZ --
2592 ---------
2594 -- This dummy procedure gives us the end of the PC range for addresses
2595 -- within the exception unit itself. We hope that gigi/gcc keeps all the
2596 -- procedures in their original order!
2599 begin
2603 begin
2604 -- Allocate the Non-Tasking Machine_State