gcc/ada/a-except.adb

   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) 1992-2006, 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,  51  Franklin  Street,  Fifth  Floor, --
  20 -- Boston, MA 02110-1301, 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 ------------------------------------------------------------------------------
  33
  34 --  This version of Ada.Exceptions is a full Ada 95 version, but lacks the
  35 --  additional definitions of Exception_Name returning Wide_[Wide_]String.
  36 --  It is used for building the compiler and the basic tools, since these
  37 --  builds may be done with bootstrap compilers that cannot handle these
  38 --  additions. The full version of Ada.Exceptions can be found in the files
  39 --  a-except-2005.ads/adb, and is used for all other builds where full Ada
  40 --  2005 functionality is required. in particular, it is used for building
  41 --  run times on all targets.
  42
  43 pragma Polling (Off);
  44 --  We must turn polling off for this unit, because otherwise we get
  45 --  elaboration circularities with System.Exception_Tables.
  46
  47 with System;                  use System;
  48 with System.Standard_Library; use System.Standard_Library;
  49 with System.Soft_Links;       use System.Soft_Links;
  50
  51 package body Ada.Exceptions is
  52
  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.
  57
  58    -----------------------
  59    -- Local Subprograms --
  60    -----------------------
  61
  62    --  Note: the exported subprograms in this package body are called directly
  63    --  from C clients using the given external name, even though they are not
  64    --  technically visible in the Ada sense.
  65
  66    procedure Process_Raise_Exception (E : Exception_Id);
  67    pragma No_Return (Process_Raise_Exception);
  68    --  This is the lowest level raise routine. It raises the exception
  69    --  referenced by Current_Excep.all in the TSD, without deferring abort
  70    --  (the caller must ensure that abort is deferred on entry).
  71
  72    procedure To_Stderr (S : String);
  73    pragma Export (Ada, To_Stderr, "__gnat_to_stderr");
  74    --  Little routine to output string to stderr that is also used
  75    --  in the tasking run time.
  76
  77    procedure To_Stderr (C : Character);
  78    pragma Inline (To_Stderr);
  79    pragma Export (Ada, To_Stderr, "__gnat_to_stderr_char");
  80    --  Little routine to output a character to stderr, used by some of
  81    --  the separate units below.
  82
  83    package Exception_Data is
  84
  85       ---------------------------------
  86       -- Exception messages routines --
  87       ---------------------------------
  88
  89       procedure Set_Exception_C_Msg
  90         (Id   : Exception_Id;
  91          Msg1 : System.Address;
  92          Line : Integer        := 0;
  93          Msg2 : System.Address := System.Null_Address);
  94       --  This routine is called to setup the exception referenced by the
  95       --  Current_Excep field in the TSD to contain the indicated Id value
  96       --  and message. Msg1 is a null terminated string which is generated
  97       --  as the exception message. If line is non-zero, then a colon and
  98       --  the decimal representation of this integer is appended to the
  99       --  message. When Msg2 is non-null, a space and this additional null
 100       --  terminated string is added to the message.
 101
 102       procedure Set_Exception_Msg
 103         (Id      : Exception_Id;
 104          Message : String);
 105       --  This routine is called to setup the exception referenced by the
 106       --  Current_Excep field in the TSD to contain the indicated Id value
 107       --  and message. Message is a string which is generated as the
 108       --  exception message.
 109
 110       --------------------------------------
 111       -- Exception information subprogram --
 112       --------------------------------------
 113
 114       function Exception_Information (X : Exception_Occurrence) return String;
 115       --  The format of the exception information is as follows:
 116       --
 117       --    Exception_Name: <exception name> (as in Exception_Name)
 118       --    Message: <message> (only if Exception_Message is empty)
 119       --    PID=nnnn (only if != 0)
 120       --    Call stack traceback locations:  (only if at least one location)
 121       --    <0xyyyyyyyy 0xyyyyyyyy ...>      (is recorded)
 122       --
 123       --  The lines are separated by a ASCII.LF character.
 124       --  The nnnn is the partition Id given as decimal digits.
 125       --  The 0x... line represents traceback program counter locations, in
 126       --  execution order with the first one being the exception location. It
 127       --  is present only
 128       --
 129       --  The Exception_Name and Message lines are omitted in the abort
 130       --  signal case, since this is not really an exception.
 131
 132       --  !! If the format of the generated string is changed, please note
 133       --  !! that an equivalent modification to the routine String_To_EO must
 134       --  !! be made to preserve proper functioning of the stream attributes.
 135
 136       ---------------------------------------
 137       -- Exception backtracing subprograms --
 138       ---------------------------------------
 139
 140       --  What is automatically output when exception tracing is on is the
 141       --  usual exception information with the call chain backtrace possibly
 142       --  tailored by a backtrace decorator. Modifying Exception_Information
 143       --  itself is not a good idea because the decorated output is completely
 144       --  out of control and would break all our code related to the streaming
 145       --  of exceptions.  We then provide an alternative function to compute
 146       --  the possibly tailored output, which is equivalent if no decorator is
 147       --  currently set:
 148
 149       function Tailored_Exception_Information
 150         (X : Exception_Occurrence) return String;
 151       --  Exception information to be output in the case of automatic tracing
 152       --  requested through GNAT.Exception_Traces.
 153       --
 154       --  This is the same as Exception_Information if no backtrace decorator
 155       --  is currently in place. Otherwise, this is Exception_Information with
 156       --  the call chain raw addresses replaced by the result of a call to the
 157       --  current decorator provided with the call chain addresses.
 158
 159       pragma Export
 160         (Ada, Tailored_Exception_Information,
 161            "__gnat_tailored_exception_information");
 162       --  This is currently used by System.Tasking.Stages
 163
 164    end Exception_Data;
 165
 166    package Exception_Traces is
 167
 168       use Exception_Data;
 169       --  Imports Tailored_Exception_Information
 170
 171       ----------------------------------------------
 172       -- Run-Time Exception Notification Routines --
 173       ----------------------------------------------
 174
 175       --  These subprograms provide a common run-time interface to trigger the
 176       --  actions required when an exception is about to be propagated (e.g.
 177       --  user specified actions or output of exception information). They are
 178       --  exported to be usable by the Ada exception handling personality
 179       --  routine when the GCC 3 mechanism is used.
 180
 181       procedure Notify_Handled_Exception;
 182       pragma Export
 183         (C, Notify_Handled_Exception, "__gnat_notify_handled_exception");
 184       --  This routine is called for a handled occurrence is about to be
 185       --  propagated.
 186
 187       procedure Notify_Unhandled_Exception;
 188       pragma Export
 189         (C, Notify_Unhandled_Exception, "__gnat_notify_unhandled_exception");
 190       --  This routine is called when an unhandled occurrence is about to be
 191       --  propagated.
 192
 193       procedure Unhandled_Exception_Terminate;
 194       pragma No_Return (Unhandled_Exception_Terminate);
 195       --  This procedure is called to terminate execution following an
 196       --  unhandled exception. The exception information, including
 197       --  traceback if available is output, and execution is then
 198       --  terminated. Note that at the point where this routine is
 199       --  called, the stack has typically been destroyed.
 200
 201    end Exception_Traces;
 202
 203    package Exception_Propagation is
 204
 205       procedure Setup_Exception
 206         (Excep    : EOA;
 207          Current  : EOA;
 208          Reraised : Boolean := False);
 209       --  Dummy routine used to share a-exexda.adb, do nothing.
 210
 211    end Exception_Propagation;
 212
 213    package Stream_Attributes is
 214
 215       --------------------------------
 216       -- Stream attributes routines --
 217       --------------------------------
 218
 219       function EId_To_String (X : Exception_Id) return String;
 220       function String_To_EId (S : String) return Exception_Id;
 221       --  Functions for implementing Exception_Id stream attributes
 222
 223       function EO_To_String (X : Exception_Occurrence) return String;
 224       function String_To_EO (S : String) return Exception_Occurrence;
 225       --  Functions for implementing Exception_Occurrence stream
 226       --  attributes
 227
 228    end Stream_Attributes;
 229
 230    procedure Raise_Current_Excep (E : Exception_Id);
 231    pragma No_Return (Raise_Current_Excep);
 232    pragma Export (C, Raise_Current_Excep, "__gnat_raise_nodefer_with_msg");
 233    --  This is a simple wrapper to Process_Raise_Exception.
 234    --
 235    --  This external name for Raise_Current_Excep is historical, and probably
 236    --  should be changed but for now we keep it, because gdb and gigi know
 237    --  about it.
 238
 239    procedure Raise_Exception_No_Defer
 240       (E : Exception_Id; Message : String := "");
 241    pragma Export
 242     (Ada, Raise_Exception_No_Defer,
 243      "ada__exceptions__raise_exception_no_defer");
 244    pragma No_Return (Raise_Exception_No_Defer);
 245    --  Similar to Raise_Exception, but with no abort deferral
 246
 247    procedure Raise_With_Msg (E : Exception_Id);
 248    pragma No_Return (Raise_With_Msg);
 249    pragma Export (C, Raise_With_Msg, "__gnat_raise_with_msg");
 250    --  Raises an exception with given exception id value. A message
 251    --  is associated with the raise, and has already been stored in the
 252    --  exception occurrence referenced by the Current_Excep in the TSD.
 253    --  Abort is deferred before the raise call.
 254
 255    procedure Raise_With_Location_And_Msg
 256      (E : Exception_Id;
 257       F : System.Address;
 258       L : Integer;
 259       M : System.Address := System.Null_Address);
 260    pragma No_Return (Raise_With_Location_And_Msg);
 261    --  Raise an exception with given exception id value. A filename and line
 262    --  number is associated with the raise and is stored in the exception
 263    --  occurrence and in addition a string message M is appended to
 264    --  this (if M is not null).
 265
 266    procedure Raise_Constraint_Error
 267      (File : System.Address;
 268       Line : Integer);
 269    pragma No_Return (Raise_Constraint_Error);
 270    pragma Export
 271      (C, Raise_Constraint_Error, "__gnat_raise_constraint_error");
 272    --  Raise constraint error with file:line information
 273
 274    procedure Raise_Constraint_Error_Msg
 275      (File : System.Address;
 276       Line : Integer;
 277       Msg  : System.Address);
 278    pragma No_Return (Raise_Constraint_Error_Msg);
 279    pragma Export
 280      (C, Raise_Constraint_Error_Msg, "__gnat_raise_constraint_error_msg");
 281    --  Raise constraint error with file:line + msg information
 282
 283    procedure Raise_Program_Error
 284      (File : System.Address;
 285       Line : Integer);
 286    pragma No_Return (Raise_Program_Error);
 287    pragma Export
 288      (C, Raise_Program_Error, "__gnat_raise_program_error");
 289    --  Raise program error with file:line information
 290
 291    procedure Raise_Program_Error_Msg
 292      (File : System.Address;
 293       Line : Integer;
 294       Msg  : System.Address);
 295    pragma No_Return (Raise_Program_Error_Msg);
 296    pragma Export
 297      (C, Raise_Program_Error_Msg, "__gnat_raise_program_error_msg");
 298    --  Raise program error with file:line + msg information
 299
 300    procedure Raise_Storage_Error
 301      (File : System.Address;
 302       Line : Integer);
 303    pragma No_Return (Raise_Storage_Error);
 304    pragma Export
 305      (C, Raise_Storage_Error, "__gnat_raise_storage_error");
 306    --  Raise storage error with file:line information
 307
 308    procedure Raise_Storage_Error_Msg
 309      (File : System.Address;
 310       Line : Integer;
 311       Msg  : System.Address);
 312    pragma No_Return (Raise_Storage_Error_Msg);
 313    pragma Export
 314      (C, Raise_Storage_Error_Msg, "__gnat_raise_storage_error_msg");
 315    --  Raise storage error with file:line + reason msg information
 316
 317    --  The exception raising process and the automatic tracing mechanism rely
 318    --  on some careful use of flags attached to the exception occurrence. The
 319    --  graph below illustrates the relations between the Raise_ subprograms
 320    --  and identifies the points where basic flags such as Exception_Raised
 321    --  are initialized.
 322    --
 323    --  (i) signs indicate the flags initialization points. R stands for Raise,
 324    --  W for With, and E for Exception.
 325    --
 326    --                   R_No_Msg    R_E   R_Pe  R_Ce  R_Se
 327    --                       |        |     |     |     |
 328    --                       +--+  +--+     +---+ | +---+
 329    --                          |  |            | | |
 330    --     R_E_No_Defer(i)    R_W_Msg(i)       R_W_Loc
 331    --           |               |              |   |
 332    --           +------------+  |  +-----------+   +--+
 333    --                        |  |  |                  |
 334    --                        |  |  |             Set_E_C_Msg(i)
 335    --                        |  |  |
 336    --                   Raise_Current_Excep
 337
 338    procedure Reraise;
 339    pragma No_Return (Reraise);
 340    pragma Export (C, Reraise, "__gnat_reraise");
 341    --  Reraises the exception referenced by the Current_Excep field of
 342    --  the TSD (all fields of this exception occurrence are set). Abort
 343    --  is deferred before the reraise operation.
 344
 345    --  Save_Occurrence variations: As the management of the private data
 346    --  attached to occurrences is delicate, wether or not pointers to such
 347    --  data has to be copied in various situations is better made explicit.
 348    --  The following procedures provide an internal interface to help making
 349    --  this explicit.
 350
 351    procedure Save_Occurrence_No_Private
 352      (Target : out Exception_Occurrence;
 353       Source : Exception_Occurrence);
 354    --  Copy all the components of Source to Target, except the
 355    --  Private_Data pointer.
 356
 357    procedure Transfer_Occurrence
 358      (Target : Exception_Occurrence_Access;
 359       Source : Exception_Occurrence);
 360    pragma Export (C, Transfer_Occurrence, "__gnat_transfer_occurrence");
 361    --  Called from System.Tasking.RendezVous.Exceptional_Complete_RendezVous
 362    --  to setup Target from Source as an exception to be propagated in the
 363    --  caller task. Target is expected to be a pointer to the fixed TSD
 364    --  occurrence for this task.
 365
 366    -----------------------------
 367    -- Run-Time Check Routines --
 368    -----------------------------
 369
 370    --  These routines are called from the runtime to raise a specific
 371    --  exception with a reason message attached. The parameters are
 372    --  the file name and line number in each case. The names are keyed
 373    --  to the codes defined in Types.ads and a-types.h (for example,
 374    --  the name Rcheck_05 refers to the Reason whose Pos code is 5).
 375
 376    procedure Rcheck_00 (File : System.Address; Line : Integer);
 377    procedure Rcheck_01 (File : System.Address; Line : Integer);
 378    procedure Rcheck_02 (File : System.Address; Line : Integer);
 379    procedure Rcheck_03 (File : System.Address; Line : Integer);
 380    procedure Rcheck_04 (File : System.Address; Line : Integer);
 381    procedure Rcheck_05 (File : System.Address; Line : Integer);
 382    procedure Rcheck_06 (File : System.Address; Line : Integer);
 383    procedure Rcheck_07 (File : System.Address; Line : Integer);
 384    procedure Rcheck_08 (File : System.Address; Line : Integer);
 385    procedure Rcheck_09 (File : System.Address; Line : Integer);
 386    procedure Rcheck_10 (File : System.Address; Line : Integer);
 387    procedure Rcheck_11 (File : System.Address; Line : Integer);
 388    procedure Rcheck_12 (File : System.Address; Line : Integer);
 389    procedure Rcheck_13 (File : System.Address; Line : Integer);
 390    procedure Rcheck_14 (File : System.Address; Line : Integer);
 391    procedure Rcheck_15 (File : System.Address; Line : Integer);
 392    procedure Rcheck_16 (File : System.Address; Line : Integer);
 393    procedure Rcheck_17 (File : System.Address; Line : Integer);
 394    procedure Rcheck_18 (File : System.Address; Line : Integer);
 395    procedure Rcheck_19 (File : System.Address; Line : Integer);
 396    procedure Rcheck_20 (File : System.Address; Line : Integer);
 397    procedure Rcheck_21 (File : System.Address; Line : Integer);
 398    procedure Rcheck_22 (File : System.Address; Line : Integer);
 399    procedure Rcheck_23 (File : System.Address; Line : Integer);
 400    procedure Rcheck_24 (File : System.Address; Line : Integer);
 401    procedure Rcheck_25 (File : System.Address; Line : Integer);
 402    procedure Rcheck_26 (File : System.Address; Line : Integer);
 403    procedure Rcheck_27 (File : System.Address; Line : Integer);
 404    procedure Rcheck_28 (File : System.Address; Line : Integer);
 405    procedure Rcheck_29 (File : System.Address; Line : Integer);
 406    procedure Rcheck_30 (File : System.Address; Line : Integer);
 407    procedure Rcheck_31 (File : System.Address; Line : Integer);
 408    procedure Rcheck_32 (File : System.Address; Line : Integer);
 409
 410    pragma Export (C, Rcheck_00, "__gnat_rcheck_00");
 411    pragma Export (C, Rcheck_01, "__gnat_rcheck_01");
 412    pragma Export (C, Rcheck_02, "__gnat_rcheck_02");
 413    pragma Export (C, Rcheck_03, "__gnat_rcheck_03");
 414    pragma Export (C, Rcheck_04, "__gnat_rcheck_04");
 415    pragma Export (C, Rcheck_05, "__gnat_rcheck_05");
 416    pragma Export (C, Rcheck_06, "__gnat_rcheck_06");
 417    pragma Export (C, Rcheck_07, "__gnat_rcheck_07");
 418    pragma Export (C, Rcheck_08, "__gnat_rcheck_08");
 419    pragma Export (C, Rcheck_09, "__gnat_rcheck_09");
 420    pragma Export (C, Rcheck_10, "__gnat_rcheck_10");
 421    pragma Export (C, Rcheck_11, "__gnat_rcheck_11");
 422    pragma Export (C, Rcheck_12, "__gnat_rcheck_12");
 423    pragma Export (C, Rcheck_13, "__gnat_rcheck_13");
 424    pragma Export (C, Rcheck_14, "__gnat_rcheck_14");
 425    pragma Export (C, Rcheck_15, "__gnat_rcheck_15");
 426    pragma Export (C, Rcheck_16, "__gnat_rcheck_16");
 427    pragma Export (C, Rcheck_17, "__gnat_rcheck_17");
 428    pragma Export (C, Rcheck_18, "__gnat_rcheck_18");
 429    pragma Export (C, Rcheck_19, "__gnat_rcheck_19");
 430    pragma Export (C, Rcheck_20, "__gnat_rcheck_20");
 431    pragma Export (C, Rcheck_21, "__gnat_rcheck_21");
 432    pragma Export (C, Rcheck_22, "__gnat_rcheck_22");
 433    pragma Export (C, Rcheck_23, "__gnat_rcheck_23");
 434    pragma Export (C, Rcheck_24, "__gnat_rcheck_24");
 435    pragma Export (C, Rcheck_25, "__gnat_rcheck_25");
 436    pragma Export (C, Rcheck_26, "__gnat_rcheck_26");
 437    pragma Export (C, Rcheck_27, "__gnat_rcheck_27");
 438    pragma Export (C, Rcheck_28, "__gnat_rcheck_28");
 439    pragma Export (C, Rcheck_29, "__gnat_rcheck_29");
 440    pragma Export (C, Rcheck_30, "__gnat_rcheck_30");
 441    pragma Export (C, Rcheck_31, "__gnat_rcheck_31");
 442    pragma Export (C, Rcheck_32, "__gnat_rcheck_32");
 443
 444    --  None of these procedures ever returns (they raise an exception!). By
 445    --  using pragma No_Return, we ensure that any junk code after the call,
 446    --  such as normal return epilog stuff, can be eliminated).
 447
 448    pragma No_Return (Rcheck_00);
 449    pragma No_Return (Rcheck_01);
 450    pragma No_Return (Rcheck_02);
 451    pragma No_Return (Rcheck_03);
 452    pragma No_Return (Rcheck_04);
 453    pragma No_Return (Rcheck_05);
 454    pragma No_Return (Rcheck_06);
 455    pragma No_Return (Rcheck_07);
 456    pragma No_Return (Rcheck_08);
 457    pragma No_Return (Rcheck_09);
 458    pragma No_Return (Rcheck_10);
 459    pragma No_Return (Rcheck_11);
 460    pragma No_Return (Rcheck_12);
 461    pragma No_Return (Rcheck_13);
 462    pragma No_Return (Rcheck_14);
 463    pragma No_Return (Rcheck_15);
 464    pragma No_Return (Rcheck_16);
 465    pragma No_Return (Rcheck_17);
 466    pragma No_Return (Rcheck_18);
 467    pragma No_Return (Rcheck_19);
 468    pragma No_Return (Rcheck_20);
 469    pragma No_Return (Rcheck_21);
 470    pragma No_Return (Rcheck_22);
 471    pragma No_Return (Rcheck_23);
 472    pragma No_Return (Rcheck_24);
 473    pragma No_Return (Rcheck_25);
 474    pragma No_Return (Rcheck_26);
 475    pragma No_Return (Rcheck_27);
 476    pragma No_Return (Rcheck_28);
 477    pragma No_Return (Rcheck_29);
 478    pragma No_Return (Rcheck_30);
 479    pragma No_Return (Rcheck_32);
 480
 481    ---------------------------------------------
 482    -- Reason Strings for Run-Time Check Calls --
 483    ---------------------------------------------
 484
 485    --  These strings are null-terminated and are used by Rcheck_nn. The
 486    --  strings correspond to the definitions for Types.RT_Exception_Code.
 487
 488    use ASCII;
 489
 490    Rmsg_00 : constant String := "access check failed"              & NUL;
 491    Rmsg_01 : constant String := "access parameter is null"         & NUL;
 492    Rmsg_02 : constant String := "discriminant check failed"        & NUL;
 493    Rmsg_03 : constant String := "divide by zero"                   & NUL;
 494    Rmsg_04 : constant String := "explicit raise"                   & NUL;
 495    Rmsg_05 : constant String := "index check failed"               & NUL;
 496    Rmsg_06 : constant String := "invalid data"                     & NUL;
 497    Rmsg_07 : constant String := "length check failed"              & NUL;
 498    Rmsg_08 : constant String := "null Exception_Id"                & NUL;
 499    Rmsg_09 : constant String := "null-exclusion check failed"      & NUL;
 500    Rmsg_10 : constant String := "overflow check failed"            & NUL;
 501    Rmsg_11 : constant String := "partition check failed"           & NUL;
 502    Rmsg_12 : constant String := "range check failed"               & NUL;
 503    Rmsg_13 : constant String := "tag check failed"                 & NUL;
 504    Rmsg_14 : constant String := "access before elaboration"        & NUL;
 505    Rmsg_15 : constant String := "accessibility check failed"       & NUL;
 506    Rmsg_16 : constant String := "all guards closed"                & NUL;
 507    Rmsg_17 : constant String := "duplicated entry address"         & NUL;
 508    Rmsg_18 : constant String := "explicit raise"                   & NUL;
 509    Rmsg_19 : constant String := "finalize/adjust raised exception" & NUL;
 510    Rmsg_20 : constant String := "implicit return with No_Return"   & NUL;
 511    Rmsg_21 : constant String := "misaligned address value"         & NUL;
 512    Rmsg_22 : constant String := "missing return"                   & NUL;
 513    Rmsg_23 : constant String := "overlaid controlled object"       & NUL;
 514    Rmsg_24 : constant String := "potentially blocking operation"   & NUL;
 515    Rmsg_25 : constant String := "stubbed subprogram called"        & NUL;
 516    Rmsg_26 : constant String := "unchecked union restriction"      & NUL;
 517    Rmsg_27 : constant String := "illegal use of remote access-to-" &
 518                                 "class-wide type, see RM E.4(18)"  & NUL;
 519    Rmsg_28 : constant String := "empty storage pool"               & NUL;
 520    Rmsg_29 : constant String := "explicit raise"                   & NUL;
 521    Rmsg_30 : constant String := "infinite recursion"               & NUL;
 522    Rmsg_31 : constant String := "object too large"                 & NUL;
 523    Rmsg_32 : constant String := "restriction violation"            & NUL;
 524
 525    -----------------------
 526    -- Polling Interface --
 527    -----------------------
 528
 529    type Unsigned is mod 2 ** 32;
 530
 531    Counter : Unsigned := 0;
 532    pragma Warnings (Off, Counter);
 533    --  This counter is provided for convenience. It can be used in Poll to
 534    --  perform periodic but not systematic operations.
 535
 536    procedure Poll is separate;
 537    --  The actual polling routine is separate, so that it can easily
 538    --  be replaced with a target dependent version.
 539
 540    ------------------------------
 541    -- Current_Target_Exception --
 542    ------------------------------
 543
 544    function Current_Target_Exception return Exception_Occurrence is
 545    begin
 546       return Null_Occurrence;
 547    end Current_Target_Exception;
 548
 549    -------------------
 550    -- EId_To_String --
 551    -------------------
 552
 553    function EId_To_String (X : Exception_Id) return String
 554      renames Stream_Attributes.EId_To_String;
 555
 556    ------------------
 557    -- EO_To_String --
 558    ------------------
 559
 560    --  We use the null string to represent the null occurrence, otherwise
 561    --  we output the Exception_Information string for the occurrence.
 562
 563    function EO_To_String (X : Exception_Occurrence) return String
 564      renames Stream_Attributes.EO_To_String;
 565
 566    ------------------------
 567    -- Exception_Identity --
 568    ------------------------
 569
 570    function Exception_Identity
 571      (X : Exception_Occurrence) return Exception_Id
 572    is
 573    begin
 574       --  Note that the following test used to be here for the original
 575       --  Ada 95 semantics, but these were modified by AI-241 to require
 576       --  returning Null_Id instead of raising Constraint_Error.
 577
 578       --  if X.Id = Null_Id then
 579       --     raise Constraint_Error;
 580       --  end if;
 581
 582       return X.Id;
 583    end Exception_Identity;
 584
 585    ---------------------------
 586    -- Exception_Information --
 587    ---------------------------
 588
 589    function Exception_Information (X : Exception_Occurrence) return String is
 590    begin
 591       if X.Id = Null_Id then
 592          raise Constraint_Error;
 593       end if;
 594
 595       return Exception_Data.Exception_Information (X);
 596    end Exception_Information;
 597
 598    -----------------------
 599    -- Exception_Message --
 600    -----------------------
 601
 602    function Exception_Message (X : Exception_Occurrence) return String is
 603    begin
 604       if X.Id = Null_Id then
 605          raise Constraint_Error;
 606       end if;
 607
 608       return X.Msg (1 .. X.Msg_Length);
 609    end Exception_Message;
 610
 611    --------------------
 612    -- Exception_Name --
 613    --------------------
 614
 615    function Exception_Name (Id : Exception_Id) return String is
 616    begin
 617       if Id = null then
 618          raise Constraint_Error;
 619       end if;
 620
 621       return To_Ptr (Id.Full_Name) (1 .. Id.Name_Length - 1);
 622    end Exception_Name;
 623
 624    function Exception_Name (X : Exception_Occurrence) return String is
 625    begin
 626       return Exception_Name (X.Id);
 627    end Exception_Name;
 628
 629    ---------------------------
 630    -- Exception_Name_Simple --
 631    ---------------------------
 632
 633    function Exception_Name_Simple (X : Exception_Occurrence) return String is
 634       Name : constant String := Exception_Name (X);
 635       P    : Natural;
 636
 637    begin
 638       P := Name'Length;
 639       while P > 1 loop
 640          exit when Name (P - 1) = '.';
 641          P := P - 1;
 642       end loop;
 643
 644       --  Return result making sure lower bound is 1
 645
 646       declare
 647          subtype Rname is String (1 .. Name'Length - P + 1);
 648       begin
 649          return Rname (Name (P .. Name'Length));
 650       end;
 651    end Exception_Name_Simple;
 652
 653    --------------------
 654    -- Exception_Data --
 655    --------------------
 656
 657    package body Exception_Data is separate;
 658    --  This package can be easily dummied out if we do not want the
 659    --  basic support for exception messages (such as in Ada 83).
 660
 661    package body Exception_Propagation is
 662
 663       procedure Setup_Exception
 664         (Excep    : EOA;
 665          Current  : EOA;
 666          Reraised : Boolean := False)
 667       is
 668          pragma Warnings (Off, Excep);
 669          pragma Warnings (Off, Current);
 670          pragma Warnings (Off, Reraised);
 671       begin
 672          null;
 673       end Setup_Exception;
 674
 675    end Exception_Propagation;
 676
 677    ----------------------
 678    -- Exception_Traces --
 679    ----------------------
 680
 681    package body Exception_Traces is separate;
 682    --  Depending on the underlying support for IO the implementation
 683    --  will differ. Moreover we would like to dummy out this package
 684    --  in case we do not want any exception tracing support. This is
 685    --  why this package is separated.
 686
 687    -----------------------
 688    -- Stream Attributes --
 689    -----------------------
 690
 691    package body Stream_Attributes is separate;
 692    --  This package can be easily dummied out if we do not want the
 693    --  support for streaming Exception_Ids and Exception_Occurrences.
 694
 695    -----------------------------
 696    -- Process_Raise_Exception --
 697    -----------------------------
 698
 699    procedure Process_Raise_Exception (E : Exception_Id) is
 700       pragma Inspection_Point (E);
 701       --  This is so the debugger can reliably inspect the parameter
 702
 703       Jumpbuf_Ptr : constant Address := Get_Jmpbuf_Address.all;
 704       Excep       : constant EOA := Get_Current_Excep.all;
 705
 706       procedure builtin_longjmp (buffer : Address; Flag : Integer);
 707       pragma No_Return (builtin_longjmp);
 708       pragma Import (C, builtin_longjmp, "_gnat_builtin_longjmp");
 709
 710    begin
 711       --  WARNING: There should be no exception handler for this body
 712       --  because this would cause gigi to prepend a setup for a new
 713       --  jmpbuf to the sequence of statements in case of built-in sjljl.
 714       --  We would then always get this new buf in Jumpbuf_Ptr instead of the
 715       --  one for the exception we are handling, which would completely break
 716       --  the whole design of this procedure.
 717
 718       --  If the jump buffer pointer is non-null, transfer control using
 719       --  it. Otherwise announce an unhandled exception (note that this
 720       --  means that we have no finalizations to do other than at the outer
 721       --  level). Perform the necessary notification tasks in both cases.
 722
 723       if Jumpbuf_Ptr /= Null_Address then
 724          if not Excep.Exception_Raised then
 725             Excep.Exception_Raised := True;
 726             Exception_Traces.Notify_Handled_Exception;
 727          end if;
 728
 729          builtin_longjmp (Jumpbuf_Ptr, 1);
 730
 731       else
 732          Exception_Traces.Notify_Unhandled_Exception;
 733          Exception_Traces.Unhandled_Exception_Terminate;
 734       end if;
 735    end Process_Raise_Exception;
 736
 737    ----------------------------
 738    -- Raise_Constraint_Error --
 739    ----------------------------
 740
 741    procedure Raise_Constraint_Error
 742      (File : System.Address;
 743       Line : Integer)
 744    is
 745    begin
 746       Raise_With_Location_And_Msg
 747         (Constraint_Error_Def'Access, File, Line);
 748    end Raise_Constraint_Error;
 749
 750    --------------------------------
 751    -- Raise_Constraint_Error_Msg --
 752    --------------------------------
 753
 754    procedure Raise_Constraint_Error_Msg
 755      (File : System.Address;
 756       Line : Integer;
 757       Msg  : System.Address)
 758    is
 759    begin
 760       Raise_With_Location_And_Msg
 761         (Constraint_Error_Def'Access, File, Line, Msg);
 762    end Raise_Constraint_Error_Msg;
 763
 764    -------------------------
 765    -- Raise_Current_Excep --
 766    -------------------------
 767
 768    procedure Raise_Current_Excep (E : Exception_Id) is
 769
 770       pragma Inspection_Point (E);
 771       --  This is so the debugger can reliably inspect the parameter when
 772       --  inserting a breakpoint at the start of this procedure.
 773
 774       Id : Exception_Id := E;
 775       pragma Volatile (Id);
 776       pragma Warnings (Off, Id);
 777       --  In order to provide support for breakpoints on unhandled exceptions,
 778       --  the debugger will also need to be able to inspect the value of E from
 779       --  another (inner) frame. So we need to make sure that if E is passed in
 780       --  a register, its value is also spilled on stack. For this, we store
 781       --  the parameter value in a local variable, and add a pragma Volatile to
 782       --  make sure it is spilled. The pragma Warnings (Off) is needed because
 783       --  the compiler knows that Id is not referenced and that this use of
 784       --  pragma Volatile is peculiar!
 785
 786    begin
 787       Process_Raise_Exception (E);
 788    end Raise_Current_Excep;
 789
 790    ---------------------
 791    -- Raise_Exception --
 792    ---------------------
 793
 794    procedure Raise_Exception
 795      (E       : Exception_Id;
 796       Message : String := "")
 797    is
 798    begin
 799       if E /= null then
 800          Exception_Data.Set_Exception_Msg (E, Message);
 801          Abort_Defer.all;
 802          Raise_Current_Excep (E);
 803       end if;
 804
 805       --  Note: if E is null, then we simply return, which is correct Ada 95
 806       --  semantics. If we are operating in Ada 2005 mode, then the expander
 807       --  generates a raise Constraint_Error immediately following the call
 808       --  to provide the required Ada 2005 semantics (see AI-329). We do it
 809       --  this way to avoid having run time dependencies on the Ada version.
 810
 811       return;
 812    end Raise_Exception;
 813
 814    ----------------------------
 815    -- Raise_Exception_Always --
 816    ----------------------------
 817
 818    procedure Raise_Exception_Always
 819      (E       : Exception_Id;
 820       Message : String := "")
 821    is
 822    begin
 823       Exception_Data.Set_Exception_Msg (E, Message);
 824       Abort_Defer.all;
 825       Raise_Current_Excep (E);
 826    end Raise_Exception_Always;
 827
 828    -------------------------------
 829    -- Raise_From_Signal_Handler --
 830    -------------------------------
 831
 832    procedure Raise_From_Signal_Handler
 833      (E : Exception_Id;
 834       M : System.Address)
 835    is
 836    begin
 837       Exception_Data.Set_Exception_C_Msg (E, M);
 838       Abort_Defer.all;
 839       Process_Raise_Exception (E);
 840    end Raise_From_Signal_Handler;
 841
 842    -------------------------
 843    -- Raise_Program_Error --
 844    -------------------------
 845
 846    procedure Raise_Program_Error
 847      (File : System.Address;
 848       Line : Integer)
 849    is
 850    begin
 851       Raise_With_Location_And_Msg
 852         (Program_Error_Def'Access, File, Line);
 853    end Raise_Program_Error;
 854
 855    -----------------------------
 856    -- Raise_Program_Error_Msg --
 857    -----------------------------
 858
 859    procedure Raise_Program_Error_Msg
 860      (File : System.Address;
 861       Line : Integer;
 862       Msg  : System.Address)
 863    is
 864    begin
 865       Raise_With_Location_And_Msg
 866         (Program_Error_Def'Access, File, Line, Msg);
 867    end Raise_Program_Error_Msg;
 868
 869    -------------------------
 870    -- Raise_Storage_Error --
 871    -------------------------
 872
 873    procedure Raise_Storage_Error
 874      (File : System.Address;
 875       Line : Integer)
 876    is
 877    begin
 878       Raise_With_Location_And_Msg
 879         (Storage_Error_Def'Access, File, Line);
 880    end Raise_Storage_Error;
 881
 882    -----------------------------
 883    -- Raise_Storage_Error_Msg --
 884    -----------------------------
 885
 886    procedure Raise_Storage_Error_Msg
 887      (File : System.Address;
 888       Line : Integer;
 889       Msg  : System.Address)
 890    is
 891    begin
 892       Raise_With_Location_And_Msg
 893         (Storage_Error_Def'Access, File, Line, Msg);
 894    end Raise_Storage_Error_Msg;
 895
 896    ---------------------------------
 897    -- Raise_With_Location_And_Msg --
 898    ---------------------------------
 899
 900    procedure Raise_With_Location_And_Msg
 901      (E : Exception_Id;
 902       F : System.Address;
 903       L : Integer;
 904       M : System.Address := System.Null_Address)
 905    is
 906    begin
 907       Exception_Data.Set_Exception_C_Msg (E, F, L, M);
 908       Abort_Defer.all;
 909       Raise_Current_Excep (E);
 910    end Raise_With_Location_And_Msg;
 911
 912    --------------------
 913    -- Raise_With_Msg --
 914    --------------------
 915
 916    procedure Raise_With_Msg (E : Exception_Id) is
 917       Excep : constant EOA := Get_Current_Excep.all;
 918
 919    begin
 920       Excep.Exception_Raised := False;
 921       Excep.Id               := E;
 922       Excep.Num_Tracebacks   := 0;
 923       Excep.Cleanup_Flag     := False;
 924       Excep.Pid              := Local_Partition_ID;
 925       Abort_Defer.all;
 926       Raise_Current_Excep (E);
 927    end Raise_With_Msg;
 928
 929    --------------------------------------
 930    -- Calls to Run-Time Check Routines --
 931    --------------------------------------
 932
 933    procedure Rcheck_00 (File : System.Address; Line : Integer) is
 934    begin
 935       Raise_Constraint_Error_Msg (File, Line, Rmsg_00'Address);
 936    end Rcheck_00;
 937
 938    procedure Rcheck_01 (File : System.Address; Line : Integer) is
 939    begin
 940       Raise_Constraint_Error_Msg (File, Line, Rmsg_01'Address);
 941    end Rcheck_01;
 942
 943    procedure Rcheck_02 (File : System.Address; Line : Integer) is
 944    begin
 945       Raise_Constraint_Error_Msg (File, Line, Rmsg_02'Address);
 946    end Rcheck_02;
 947
 948    procedure Rcheck_03 (File : System.Address; Line : Integer) is
 949    begin
 950       Raise_Constraint_Error_Msg (File, Line, Rmsg_03'Address);
 951    end Rcheck_03;
 952
 953    procedure Rcheck_04 (File : System.Address; Line : Integer) is
 954    begin
 955       Raise_Constraint_Error_Msg (File, Line, Rmsg_04'Address);
 956    end Rcheck_04;
 957
 958    procedure Rcheck_05 (File : System.Address; Line : Integer) is
 959    begin
 960       Raise_Constraint_Error_Msg (File, Line, Rmsg_05'Address);
 961    end Rcheck_05;
 962
 963    procedure Rcheck_06 (File : System.Address; Line : Integer) is
 964    begin
 965       Raise_Constraint_Error_Msg (File, Line, Rmsg_06'Address);
 966    end Rcheck_06;
 967
 968    procedure Rcheck_07 (File : System.Address; Line : Integer) is
 969    begin
 970       Raise_Constraint_Error_Msg (File, Line, Rmsg_07'Address);
 971    end Rcheck_07;
 972
 973    procedure Rcheck_08 (File : System.Address; Line : Integer) is
 974    begin
 975       Raise_Constraint_Error_Msg (File, Line, Rmsg_08'Address);
 976    end Rcheck_08;
 977
 978    procedure Rcheck_09 (File : System.Address; Line : Integer) is
 979    begin
 980       Raise_Constraint_Error_Msg (File, Line, Rmsg_09'Address);
 981    end Rcheck_09;
 982
 983    procedure Rcheck_10 (File : System.Address; Line : Integer) is
 984    begin
 985       Raise_Constraint_Error_Msg (File, Line, Rmsg_10'Address);
 986    end Rcheck_10;
 987
 988    procedure Rcheck_11 (File : System.Address; Line : Integer) is
 989    begin
 990       Raise_Constraint_Error_Msg (File, Line, Rmsg_11'Address);
 991    end Rcheck_11;
 992
 993    procedure Rcheck_12 (File : System.Address; Line : Integer) is
 994    begin
 995       Raise_Constraint_Error_Msg (File, Line, Rmsg_12'Address);
 996    end Rcheck_12;
 997
 998    procedure Rcheck_13 (File : System.Address; Line : Integer) is
 999    begin
1000       Raise_Constraint_Error_Msg (File, Line, Rmsg_13'Address);
1001    end Rcheck_13;
1002
1003    procedure Rcheck_14 (File : System.Address; Line : Integer) is
1004    begin
1005       Raise_Program_Error_Msg (File, Line, Rmsg_14'Address);
1006    end Rcheck_14;
1007
1008    procedure Rcheck_15 (File : System.Address; Line : Integer) is
1009    begin
1010       Raise_Program_Error_Msg (File, Line, Rmsg_15'Address);
1011    end Rcheck_15;
1012
1013    procedure Rcheck_16 (File : System.Address; Line : Integer) is
1014    begin
1015       Raise_Program_Error_Msg (File, Line, Rmsg_16'Address);
1016    end Rcheck_16;
1017
1018    procedure Rcheck_17 (File : System.Address; Line : Integer) is
1019    begin
1020       Raise_Program_Error_Msg (File, Line, Rmsg_17'Address);
1021    end Rcheck_17;
1022
1023    procedure Rcheck_18 (File : System.Address; Line : Integer) is
1024    begin
1025       Raise_Program_Error_Msg (File, Line, Rmsg_18'Address);
1026    end Rcheck_18;
1027
1028    procedure Rcheck_19 (File : System.Address; Line : Integer) is
1029    begin
1030       Raise_Program_Error_Msg (File, Line, Rmsg_19'Address);
1031    end Rcheck_19;
1032
1033    procedure Rcheck_20 (File : System.Address; Line : Integer) is
1034    begin
1035       Raise_Program_Error_Msg (File, Line, Rmsg_20'Address);
1036    end Rcheck_20;
1037
1038    procedure Rcheck_21 (File : System.Address; Line : Integer) is
1039    begin
1040       Raise_Program_Error_Msg (File, Line, Rmsg_21'Address);
1041    end Rcheck_21;
1042
1043    procedure Rcheck_22 (File : System.Address; Line : Integer) is
1044    begin
1045       Raise_Program_Error_Msg (File, Line, Rmsg_22'Address);
1046    end Rcheck_22;
1047
1048    procedure Rcheck_23 (File : System.Address; Line : Integer) is
1049    begin
1050       Raise_Program_Error_Msg (File, Line, Rmsg_23'Address);
1051    end Rcheck_23;
1052
1053    procedure Rcheck_24 (File : System.Address; Line : Integer) is
1054    begin
1055       Raise_Program_Error_Msg (File, Line, Rmsg_24'Address);
1056    end Rcheck_24;
1057
1058    procedure Rcheck_25 (File : System.Address; Line : Integer) is
1059    begin
1060       Raise_Program_Error_Msg (File, Line, Rmsg_25'Address);
1061    end Rcheck_25;
1062
1063    procedure Rcheck_26 (File : System.Address; Line : Integer) is
1064    begin
1065       Raise_Program_Error_Msg (File, Line, Rmsg_26'Address);
1066    end Rcheck_26;
1067
1068    procedure Rcheck_27 (File : System.Address; Line : Integer) is
1069    begin
1070       Raise_Program_Error_Msg (File, Line, Rmsg_27'Address);
1071    end Rcheck_27;
1072
1073    procedure Rcheck_28 (File : System.Address; Line : Integer) is
1074    begin
1075       Raise_Storage_Error_Msg (File, Line, Rmsg_28'Address);
1076    end Rcheck_28;
1077
1078    procedure Rcheck_29 (File : System.Address; Line : Integer) is
1079    begin
1080       Raise_Storage_Error_Msg (File, Line, Rmsg_29'Address);
1081    end Rcheck_29;
1082
1083    procedure Rcheck_30 (File : System.Address; Line : Integer) is
1084    begin
1085       Raise_Storage_Error_Msg (File, Line, Rmsg_30'Address);
1086    end Rcheck_30;
1087
1088    procedure Rcheck_31 (File : System.Address; Line : Integer) is
1089    begin
1090       Raise_Storage_Error_Msg (File, Line, Rmsg_31'Address);
1091    end Rcheck_31;
1092
1093    procedure Rcheck_32 (File : System.Address; Line : Integer) is
1094    begin
1095       Raise_Storage_Error_Msg (File, Line, Rmsg_32'Address);
1096    end Rcheck_32;
1097
1098    -------------
1099    -- Reraise --
1100    -------------
1101
1102    procedure Reraise is
1103       Excep : constant EOA := Get_Current_Excep.all;
1104
1105    begin
1106       Abort_Defer.all;
1107       Raise_Current_Excep (Excep.Id);
1108    end Reraise;
1109
1110    ------------------------
1111    -- Reraise_Occurrence --
1112    ------------------------
1113
1114    procedure Reraise_Occurrence (X : Exception_Occurrence) is
1115    begin
1116       if X.Id /= null then
1117          Abort_Defer.all;
1118          Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1119          Raise_Current_Excep (X.Id);
1120       end if;
1121    end Reraise_Occurrence;
1122
1123    -------------------------------
1124    -- Reraise_Occurrence_Always --
1125    -------------------------------
1126
1127    procedure Reraise_Occurrence_Always (X : Exception_Occurrence) is
1128    begin
1129       Abort_Defer.all;
1130       Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1131       Raise_Current_Excep (X.Id);
1132    end Reraise_Occurrence_Always;
1133
1134    ---------------------------------
1135    -- Reraise_Occurrence_No_Defer --
1136    ---------------------------------
1137
1138    procedure Reraise_Occurrence_No_Defer (X : Exception_Occurrence) is
1139    begin
1140       Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1141       Raise_Current_Excep (X.Id);
1142    end Reraise_Occurrence_No_Defer;
1143
1144    ---------------------
1145    -- Save_Occurrence --
1146    ---------------------
1147
1148    procedure Save_Occurrence
1149      (Target : out Exception_Occurrence;
1150       Source : Exception_Occurrence)
1151    is
1152    begin
1153       Save_Occurrence_No_Private (Target, Source);
1154    end Save_Occurrence;
1155
1156    function Save_Occurrence (Source : Exception_Occurrence) return EOA is
1157       Target : constant EOA := new Exception_Occurrence;
1158    begin
1159       Save_Occurrence (Target.all, Source);
1160       return Target;
1161    end Save_Occurrence;
1162
1163    --------------------------------
1164    -- Save_Occurrence_No_Private --
1165    --------------------------------
1166
1167    procedure Save_Occurrence_No_Private
1168      (Target : out Exception_Occurrence;
1169       Source : Exception_Occurrence)
1170    is
1171    begin
1172       Target.Id             := Source.Id;
1173       Target.Msg_Length     := Source.Msg_Length;
1174       Target.Num_Tracebacks := Source.Num_Tracebacks;
1175       Target.Pid            := Source.Pid;
1176       Target.Cleanup_Flag   := Source.Cleanup_Flag;
1177
1178       Target.Msg (1 .. Target.Msg_Length) :=
1179         Source.Msg (1 .. Target.Msg_Length);
1180
1181       Target.Tracebacks (1 .. Target.Num_Tracebacks) :=
1182         Source.Tracebacks (1 .. Target.Num_Tracebacks);
1183    end Save_Occurrence_No_Private;
1184
1185    -------------------------
1186    -- Transfer_Occurrence --
1187    -------------------------
1188
1189    procedure Transfer_Occurrence
1190      (Target : Exception_Occurrence_Access;
1191       Source : Exception_Occurrence)
1192    is
1193    begin
1194       --  Setup Target as an exception to be propagated in the calling task
1195       --  (rendezvous-wise), taking care not to clobber the associated private
1196       --  data.  Target is expected to be a pointer to the calling task's
1197       --  fixed TSD occurrence, which is very different from Get_Current_Excep
1198       --  here because this subprogram is called from the called task.
1199
1200       Save_Occurrence_No_Private (Target.all, Source);
1201    end Transfer_Occurrence;
1202
1203    -------------------
1204    -- String_To_EId --
1205    -------------------
1206
1207    function String_To_EId (S : String) return Exception_Id
1208      renames Stream_Attributes.String_To_EId;
1209
1210    ------------------
1211    -- String_To_EO --
1212    ------------------
1213
1214    function String_To_EO (S : String) return Exception_Occurrence
1215      renames Stream_Attributes.String_To_EO;
1216
1217    ------------------------------
1218    -- Raise_Exception_No_Defer --
1219    ------------------------------
1220
1221    procedure Raise_Exception_No_Defer
1222      (E       : Exception_Id;
1223       Message : String := "")
1224    is
1225    begin
1226       Exception_Data.Set_Exception_Msg (E, Message);
1227
1228       --  Do not call Abort_Defer.all, as specified by the spec
1229
1230       Raise_Current_Excep (E);
1231    end Raise_Exception_No_Defer;
1232
1233    ---------------
1234    -- To_Stderr --
1235    ---------------
1236
1237    procedure To_Stderr (C : Character) is
1238
1239       type int is new Integer;
1240
1241       procedure put_char_stderr (C : int);
1242       pragma Import (C, put_char_stderr, "put_char_stderr");
1243
1244    begin
1245       put_char_stderr (Character'Pos (C));
1246    end To_Stderr;
1247
1248    procedure To_Stderr (S : String) is
1249    begin
1250       for J in S'Range loop
1251          if S (J) /= ASCII.CR then
1252             To_Stderr (S (J));
1253          end if;
1254       end loop;
1255    end To_Stderr;
1256
1257 end Ada.Exceptions;