gcc/ada/a-except-2005.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) 1992-2007, 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 is used for all Ada 2005 builds. It differs from a-except.ads
  35 --  only with respect to the addition of Wide_[Wide]Exception_Name functions.
  36
  37 --  The reason for this splitting off of a separate version is that bootstrap
  38 --  compilers often will be used that do not support Ada 2005 features, and
  39 --  Ada.Exceptions is part of the compiler sources.
  40
  41 --  The base version of this unit Ada.Exceptions omits the Wide version of
  42 --  Exception_Name and is used to build the compiler and other basic tools.
  43
  44 pragma Style_Checks (All_Checks);
  45 --  No subprogram ordering check, due to logical grouping
  46
  47 pragma Polling (Off);
  48 --  We must turn polling off for this unit, because otherwise we get
  49 --  elaboration circularities with System.Exception_Tables.
  50
  51 with System;                  use System;
  52 with System.Exceptions;       use System.Exceptions;
  53 with System.Standard_Library; use System.Standard_Library;
  54 with System.Soft_Links;       use System.Soft_Links;
  55 with System.WCh_Con;          use System.WCh_Con;
  56 with System.WCh_StW;          use System.WCh_StW;
  57
  58 package body Ada.Exceptions is
  59
  60    pragma Suppress (All_Checks);
  61    --  We definitely do not want exceptions occurring within this unit, or
  62    --  we are in big trouble. If an exceptional situation does occur, better
  63    --  that it not be raised, since raising it can cause confusing chaos.
  64
  65    -----------------------
  66    -- Local Subprograms --
  67    -----------------------
  68
  69    --  Note: the exported subprograms in this package body are called directly
  70    --  from C clients using the given external name, even though they are not
  71    --  technically visible in the Ada sense.
  72
  73    function Code_Address_For_AAA return System.Address;
  74    function Code_Address_For_ZZZ return System.Address;
  75    --  Return start and end of procedures in this package
  76    --
  77    --  These procedures are used to provide exclusion bounds in
  78    --  calls to Call_Chain at exception raise points from this unit. The
  79    --  purpose is to arrange for the exception tracebacks not to include
  80    --  frames from routines involved in the raise process, as these are
  81    --  meaningless from the user's standpoint.
  82    --
  83    --  For these bounds to be meaningful, we need to ensure that the object
  84    --  code for the routines involved in processing a raise is located after
  85    --  the object code Code_Address_For_AAA and before the object code
  86    --  Code_Address_For_ZZZ. This will indeed be the case as long as the
  87    --  following rules are respected:
  88    --
  89    --  1) The bodies of the subprograms involved in processing a raise
  90    --     are located after the body of Code_Address_For_AAA and before the
  91    --     body of Code_Address_For_ZZZ.
  92    --
  93    --  2) No pragma Inline applies to any of these subprograms, as this
  94    --     could delay the corresponding assembly output until the end of
  95    --     the unit.
  96
  97    procedure Call_Chain (Excep : EOA);
  98    --  Store up to Max_Tracebacks in Excep, corresponding to the current
  99    --  call chain.
 100
 101    procedure To_Stderr (S : String);
 102    pragma Export (Ada, To_Stderr, "__gnat_to_stderr");
 103    --  Little routine to output string to stderr that is also used
 104    --  in the tasking run time.
 105
 106    procedure To_Stderr (C : Character);
 107    pragma Inline (To_Stderr);
 108    pragma Export (Ada, To_Stderr, "__gnat_to_stderr_char");
 109    --  Little routine to output a character to stderr, used by some of
 110    --  the separate units below.
 111
 112    package Exception_Data is
 113
 114       ---------------------------------
 115       -- Exception messages routines --
 116       ---------------------------------
 117
 118       procedure Set_Exception_C_Msg
 119         (Id   : Exception_Id;
 120          Msg1 : System.Address;
 121          Line : Integer        := 0;
 122          Msg2 : System.Address := System.Null_Address);
 123       --  This routine is called to setup the exception referenced by the
 124       --  Current_Excep field in the TSD to contain the indicated Id value
 125       --  and message. Msg1 is a null terminated string which is generated
 126       --  as the exception message. If line is non-zero, then a colon and
 127       --  the decimal representation of this integer is appended to the
 128       --  message. When Msg2 is non-null, a space and this additional null
 129       --  terminated string is added to the message.
 130
 131       procedure Set_Exception_Msg
 132         (Id      : Exception_Id;
 133          Message : String);
 134       --  This routine is called to setup the exception referenced by the
 135       --  Current_Excep field in the TSD to contain the indicated Id value
 136       --  and message. Message is a string which is generated as the
 137       --  exception message.
 138
 139       --------------------------------------
 140       -- Exception information subprogram --
 141       --------------------------------------
 142
 143       function Exception_Information (X : Exception_Occurrence) return String;
 144       --  The format of the exception information is as follows:
 145       --
 146       --    Exception_Name: <exception name> (as in Exception_Name)
 147       --    Message: <message> (only if Exception_Message is empty)
 148       --    PID=nnnn (only if != 0)
 149       --    Call stack traceback locations:  (only if at least one location)
 150       --    <0xyyyyyyyy 0xyyyyyyyy ...>      (is recorded)
 151       --
 152       --  The lines are separated by a ASCII.LF character.
 153       --  The nnnn is the partition Id given as decimal digits.
 154       --  The 0x... line represents traceback program counter locations, in
 155       --  execution order with the first one being the exception location. It
 156       --  is present only
 157       --
 158       --  The Exception_Name and Message lines are omitted in the abort
 159       --  signal case, since this is not really an exception.
 160
 161       --  !! If the format of the generated string is changed, please note
 162       --  !! that an equivalent modification to the routine String_To_EO must
 163       --  !! be made to preserve proper functioning of the stream attributes.
 164
 165       ---------------------------------------
 166       -- Exception backtracing subprograms --
 167       ---------------------------------------
 168
 169       --  What is automatically output when exception tracing is on is the
 170       --  usual exception information with the call chain backtrace possibly
 171       --  tailored by a backtrace decorator. Modifying Exception_Information
 172       --  itself is not a good idea because the decorated output is completely
 173       --  out of control and would break all our code related to the streaming
 174       --  of exceptions.  We then provide an alternative function to compute
 175       --  the possibly tailored output, which is equivalent if no decorator is
 176       --  currently set:
 177
 178       function Tailored_Exception_Information
 179         (X : Exception_Occurrence) return String;
 180       --  Exception information to be output in the case of automatic tracing
 181       --  requested through GNAT.Exception_Traces.
 182       --
 183       --  This is the same as Exception_Information if no backtrace decorator
 184       --  is currently in place. Otherwise, this is Exception_Information with
 185       --  the call chain raw addresses replaced by the result of a call to the
 186       --  current decorator provided with the call chain addresses.
 187
 188       pragma Export
 189         (Ada, Tailored_Exception_Information,
 190            "__gnat_tailored_exception_information");
 191       --  This is currently used by System.Tasking.Stages
 192
 193    end Exception_Data;
 194
 195    package Exception_Traces is
 196
 197       use Exception_Data;
 198       --  Imports Tailored_Exception_Information
 199
 200       ----------------------------------------------
 201       -- Run-Time Exception Notification Routines --
 202       ----------------------------------------------
 203
 204       --  These subprograms provide a common run-time interface to trigger the
 205       --  actions required when an exception is about to be propagated (e.g.
 206       --  user specified actions or output of exception information). They are
 207       --  exported to be usable by the Ada exception handling personality
 208       --  routine when the GCC 3 mechanism is used.
 209
 210       procedure Notify_Handled_Exception;
 211       pragma Export
 212         (C, Notify_Handled_Exception, "__gnat_notify_handled_exception");
 213       --  This routine is called for a handled occurrence is about to be
 214       --  propagated.
 215
 216       procedure Notify_Unhandled_Exception;
 217       pragma Export
 218         (C, Notify_Unhandled_Exception, "__gnat_notify_unhandled_exception");
 219       --  This routine is called when an unhandled occurrence is about to be
 220       --  propagated.
 221
 222       procedure Unhandled_Exception_Terminate;
 223       pragma No_Return (Unhandled_Exception_Terminate);
 224       --  This procedure is called to terminate execution following an
 225       --  unhandled exception. The exception information, including
 226       --  traceback if available is output, and execution is then
 227       --  terminated. Note that at the point where this routine is
 228       --  called, the stack has typically been destroyed.
 229
 230    end Exception_Traces;
 231
 232    package Exception_Propagation is
 233
 234       use Exception_Traces;
 235       --  Imports Notify_Unhandled_Exception and
 236       --  Unhandled_Exception_Terminate
 237
 238       ------------------------------------
 239       -- Exception propagation routines --
 240       ------------------------------------
 241
 242       procedure Setup_Exception
 243         (Excep    : EOA;
 244          Current  : EOA;
 245          Reraised : Boolean := False);
 246       --  Perform the necessary operations to prepare the propagation of Excep
 247       --  in a task where Current is the current occurrence. Excep is assumed
 248       --  to be a valid (non null) pointer.
 249       --
 250       --  This should be called before any (re-)setting of the current
 251       --  occurrence. Any such (re-)setting shall take care *not* to clobber
 252       --  the Private_Data component.
 253       --
 254       --  Having Current provided as an argument (instead of retrieving it via
 255       --  Get_Current_Excep internally) is required to allow one task to setup
 256       --  an exception for another task, which is used by Transfer_Occurrence.
 257
 258       procedure Propagate_Exception
 259         (E                   : Exception_Id;
 260          From_Signal_Handler : Boolean);
 261       pragma No_Return (Propagate_Exception);
 262       --  This procedure propagates the exception represented by the occurrence
 263       --  referenced by Current_Excep in the TSD for the current task.
 264
 265    end Exception_Propagation;
 266
 267    package Stream_Attributes is
 268
 269       --------------------------------
 270       -- Stream attributes routines --
 271       --------------------------------
 272
 273       function EId_To_String (X : Exception_Id) return String;
 274       function String_To_EId (S : String) return Exception_Id;
 275       --  Functions for implementing Exception_Id stream attributes
 276
 277       function EO_To_String (X : Exception_Occurrence) return String;
 278       function String_To_EO (S : String) return Exception_Occurrence;
 279       --  Functions for implementing Exception_Occurrence stream
 280       --  attributes
 281
 282    end Stream_Attributes;
 283
 284    procedure Raise_Current_Excep (E : Exception_Id);
 285    pragma No_Return (Raise_Current_Excep);
 286    pragma Export (C, Raise_Current_Excep, "__gnat_raise_nodefer_with_msg");
 287    --  This is a simple wrapper to Exception_Propagation.Propagate_Exception
 288    --  setting the From_Signal_Handler argument to False.
 289    --
 290    --  This external name for Raise_Current_Excep is historical, and probably
 291    --  should be changed but for now we keep it, because gdb and gigi know
 292    --  about it.
 293
 294    procedure Raise_Exception_No_Defer
 295       (E : Exception_Id; Message : String := "");
 296    pragma Export
 297     (Ada, Raise_Exception_No_Defer,
 298      "ada__exceptions__raise_exception_no_defer");
 299    pragma No_Return (Raise_Exception_No_Defer);
 300    --  Similar to Raise_Exception, but with no abort deferral
 301
 302    procedure Raise_With_Msg (E : Exception_Id);
 303    pragma No_Return (Raise_With_Msg);
 304    pragma Export (C, Raise_With_Msg, "__gnat_raise_with_msg");
 305    --  Raises an exception with given exception id value. A message
 306    --  is associated with the raise, and has already been stored in the
 307    --  exception occurrence referenced by the Current_Excep in the TSD.
 308    --  Abort is deferred before the raise call.
 309
 310    procedure Raise_With_Location_And_Msg
 311      (E : Exception_Id;
 312       F : System.Address;
 313       L : Integer;
 314       M : System.Address := System.Null_Address);
 315    pragma No_Return (Raise_With_Location_And_Msg);
 316    --  Raise an exception with given exception id value. A filename and line
 317    --  number is associated with the raise and is stored in the exception
 318    --  occurrence and in addition a string message M is appended to
 319    --  this (if M is not null).
 320
 321    procedure Raise_Constraint_Error
 322      (File : System.Address;
 323       Line : Integer);
 324    pragma No_Return (Raise_Constraint_Error);
 325    pragma Export
 326      (C, Raise_Constraint_Error, "__gnat_raise_constraint_error");
 327    --  Raise constraint error with file:line information
 328
 329    procedure Raise_Constraint_Error_Msg
 330      (File : System.Address;
 331       Line : Integer;
 332       Msg  : System.Address);
 333    pragma No_Return (Raise_Constraint_Error_Msg);
 334    pragma Export
 335      (C, Raise_Constraint_Error_Msg, "__gnat_raise_constraint_error_msg");
 336    --  Raise constraint error with file:line + msg information
 337
 338    procedure Raise_Program_Error
 339      (File : System.Address;
 340       Line : Integer);
 341    pragma No_Return (Raise_Program_Error);
 342    pragma Export
 343      (C, Raise_Program_Error, "__gnat_raise_program_error");
 344    --  Raise program error with file:line information
 345
 346    procedure Raise_Program_Error_Msg
 347      (File : System.Address;
 348       Line : Integer;
 349       Msg  : System.Address);
 350    pragma No_Return (Raise_Program_Error_Msg);
 351    pragma Export
 352      (C, Raise_Program_Error_Msg, "__gnat_raise_program_error_msg");
 353    --  Raise program error with file:line + msg information
 354
 355    procedure Raise_Storage_Error
 356      (File : System.Address;
 357       Line : Integer);
 358    pragma No_Return (Raise_Storage_Error);
 359    pragma Export
 360      (C, Raise_Storage_Error, "__gnat_raise_storage_error");
 361    --  Raise storage error with file:line information
 362
 363    procedure Raise_Storage_Error_Msg
 364      (File : System.Address;
 365       Line : Integer;
 366       Msg  : System.Address);
 367    pragma No_Return (Raise_Storage_Error_Msg);
 368    pragma Export
 369      (C, Raise_Storage_Error_Msg, "__gnat_raise_storage_error_msg");
 370    --  Raise storage error with file:line + reason msg information
 371
 372    --  The exception raising process and the automatic tracing mechanism rely
 373    --  on some careful use of flags attached to the exception occurrence. The
 374    --  graph below illustrates the relations between the Raise_ subprograms
 375    --  and identifies the points where basic flags such as Exception_Raised
 376    --  are initialized.
 377    --
 378    --  (i) signs indicate the flags initialization points. R stands for Raise,
 379    --  W for With, and E for Exception.
 380    --
 381    --                   R_No_Msg    R_E   R_Pe  R_Ce  R_Se
 382    --                       |        |     |     |     |
 383    --                       +--+  +--+     +---+ | +---+
 384    --                          |  |            | | |
 385    --     R_E_No_Defer(i)    R_W_Msg(i)       R_W_Loc
 386    --           |               |              |   |
 387    --           +------------+  |  +-----------+   +--+
 388    --                        |  |  |                  |
 389    --                        |  |  |             Set_E_C_Msg(i)
 390    --                        |  |  |
 391    --                   Raise_Current_Excep
 392
 393    procedure Reraise;
 394    pragma No_Return (Reraise);
 395    pragma Export (C, Reraise, "__gnat_reraise");
 396    --  Reraises the exception referenced by the Current_Excep field of
 397    --  the TSD (all fields of this exception occurrence are set). Abort
 398    --  is deferred before the reraise operation.
 399
 400    --  Save_Occurrence variations: As the management of the private data
 401    --  attached to occurrences is delicate, wether or not pointers to such
 402    --  data has to be copied in various situations is better made explicit.
 403    --  The following procedures provide an internal interface to help making
 404    --  this explicit.
 405
 406    procedure Save_Occurrence_No_Private
 407      (Target : out Exception_Occurrence;
 408       Source : Exception_Occurrence);
 409    --  Copy all the components of Source to Target, except the
 410    --  Private_Data pointer.
 411
 412    procedure Transfer_Occurrence
 413      (Target : Exception_Occurrence_Access;
 414       Source : Exception_Occurrence);
 415    pragma Export (C, Transfer_Occurrence, "__gnat_transfer_occurrence");
 416    --  Called from System.Tasking.RendezVous.Exceptional_Complete_RendezVous
 417    --  to setup Target from Source as an exception to be propagated in the
 418    --  caller task. Target is expected to be a pointer to the fixed TSD
 419    --  occurrence for this task.
 420
 421    -----------------------------
 422    -- Run-Time Check Routines --
 423    -----------------------------
 424
 425    --  These routines are called from the runtime to raise a specific
 426    --  exception with a reason message attached. The parameters are
 427    --  the file name and line number in each case. The names are keyed
 428    --  to the codes defined in Types.ads and a-types.h (for example,
 429    --  the name Rcheck_05 refers to the Reason whose Pos code is 5).
 430
 431    procedure Rcheck_00 (File : System.Address; Line : Integer);
 432    procedure Rcheck_01 (File : System.Address; Line : Integer);
 433    procedure Rcheck_02 (File : System.Address; Line : Integer);
 434    procedure Rcheck_03 (File : System.Address; Line : Integer);
 435    procedure Rcheck_04 (File : System.Address; Line : Integer);
 436    procedure Rcheck_05 (File : System.Address; Line : Integer);
 437    procedure Rcheck_06 (File : System.Address; Line : Integer);
 438    procedure Rcheck_07 (File : System.Address; Line : Integer);
 439    procedure Rcheck_08 (File : System.Address; Line : Integer);
 440    procedure Rcheck_09 (File : System.Address; Line : Integer);
 441    procedure Rcheck_10 (File : System.Address; Line : Integer);
 442    procedure Rcheck_11 (File : System.Address; Line : Integer);
 443    procedure Rcheck_12 (File : System.Address; Line : Integer);
 444    procedure Rcheck_13 (File : System.Address; Line : Integer);
 445    procedure Rcheck_14 (File : System.Address; Line : Integer);
 446    procedure Rcheck_15 (File : System.Address; Line : Integer);
 447    procedure Rcheck_16 (File : System.Address; Line : Integer);
 448    procedure Rcheck_17 (File : System.Address; Line : Integer);
 449    procedure Rcheck_18 (File : System.Address; Line : Integer);
 450    procedure Rcheck_19 (File : System.Address; Line : Integer);
 451    procedure Rcheck_20 (File : System.Address; Line : Integer);
 452    procedure Rcheck_21 (File : System.Address; Line : Integer);
 453    procedure Rcheck_22 (File : System.Address; Line : Integer);
 454    procedure Rcheck_23 (File : System.Address; Line : Integer);
 455    procedure Rcheck_24 (File : System.Address; Line : Integer);
 456    procedure Rcheck_25 (File : System.Address; Line : Integer);
 457    procedure Rcheck_26 (File : System.Address; Line : Integer);
 458    procedure Rcheck_27 (File : System.Address; Line : Integer);
 459    procedure Rcheck_28 (File : System.Address; Line : Integer);
 460    procedure Rcheck_29 (File : System.Address; Line : Integer);
 461    procedure Rcheck_30 (File : System.Address; Line : Integer);
 462    procedure Rcheck_31 (File : System.Address; Line : Integer);
 463    procedure Rcheck_32 (File : System.Address; Line : Integer);
 464
 465    pragma Export (C, Rcheck_00, "__gnat_rcheck_00");
 466    pragma Export (C, Rcheck_01, "__gnat_rcheck_01");
 467    pragma Export (C, Rcheck_02, "__gnat_rcheck_02");
 468    pragma Export (C, Rcheck_03, "__gnat_rcheck_03");
 469    pragma Export (C, Rcheck_04, "__gnat_rcheck_04");
 470    pragma Export (C, Rcheck_05, "__gnat_rcheck_05");
 471    pragma Export (C, Rcheck_06, "__gnat_rcheck_06");
 472    pragma Export (C, Rcheck_07, "__gnat_rcheck_07");
 473    pragma Export (C, Rcheck_08, "__gnat_rcheck_08");
 474    pragma Export (C, Rcheck_09, "__gnat_rcheck_09");
 475    pragma Export (C, Rcheck_10, "__gnat_rcheck_10");
 476    pragma Export (C, Rcheck_11, "__gnat_rcheck_11");
 477    pragma Export (C, Rcheck_12, "__gnat_rcheck_12");
 478    pragma Export (C, Rcheck_13, "__gnat_rcheck_13");
 479    pragma Export (C, Rcheck_14, "__gnat_rcheck_14");
 480    pragma Export (C, Rcheck_15, "__gnat_rcheck_15");
 481    pragma Export (C, Rcheck_16, "__gnat_rcheck_16");
 482    pragma Export (C, Rcheck_17, "__gnat_rcheck_17");
 483    pragma Export (C, Rcheck_18, "__gnat_rcheck_18");
 484    pragma Export (C, Rcheck_19, "__gnat_rcheck_19");
 485    pragma Export (C, Rcheck_20, "__gnat_rcheck_20");
 486    pragma Export (C, Rcheck_21, "__gnat_rcheck_21");
 487    pragma Export (C, Rcheck_22, "__gnat_rcheck_22");
 488    pragma Export (C, Rcheck_23, "__gnat_rcheck_23");
 489    pragma Export (C, Rcheck_24, "__gnat_rcheck_24");
 490    pragma Export (C, Rcheck_25, "__gnat_rcheck_25");
 491    pragma Export (C, Rcheck_26, "__gnat_rcheck_26");
 492    pragma Export (C, Rcheck_27, "__gnat_rcheck_27");
 493    pragma Export (C, Rcheck_28, "__gnat_rcheck_28");
 494    pragma Export (C, Rcheck_29, "__gnat_rcheck_29");
 495    pragma Export (C, Rcheck_30, "__gnat_rcheck_30");
 496    pragma Export (C, Rcheck_31, "__gnat_rcheck_31");
 497    pragma Export (C, Rcheck_32, "__gnat_rcheck_32");
 498
 499    --  None of these procedures ever returns (they raise an exception!). By
 500    --  using pragma No_Return, we ensure that any junk code after the call,
 501    --  such as normal return epilog stuff, can be eliminated).
 502
 503    pragma No_Return (Rcheck_00);
 504    pragma No_Return (Rcheck_01);
 505    pragma No_Return (Rcheck_02);
 506    pragma No_Return (Rcheck_03);
 507    pragma No_Return (Rcheck_04);
 508    pragma No_Return (Rcheck_05);
 509    pragma No_Return (Rcheck_06);
 510    pragma No_Return (Rcheck_07);
 511    pragma No_Return (Rcheck_08);
 512    pragma No_Return (Rcheck_09);
 513    pragma No_Return (Rcheck_10);
 514    pragma No_Return (Rcheck_11);
 515    pragma No_Return (Rcheck_12);
 516    pragma No_Return (Rcheck_13);
 517    pragma No_Return (Rcheck_14);
 518    pragma No_Return (Rcheck_15);
 519    pragma No_Return (Rcheck_16);
 520    pragma No_Return (Rcheck_17);
 521    pragma No_Return (Rcheck_18);
 522    pragma No_Return (Rcheck_19);
 523    pragma No_Return (Rcheck_20);
 524    pragma No_Return (Rcheck_21);
 525    pragma No_Return (Rcheck_22);
 526    pragma No_Return (Rcheck_23);
 527    pragma No_Return (Rcheck_24);
 528    pragma No_Return (Rcheck_25);
 529    pragma No_Return (Rcheck_26);
 530    pragma No_Return (Rcheck_27);
 531    pragma No_Return (Rcheck_28);
 532    pragma No_Return (Rcheck_29);
 533    pragma No_Return (Rcheck_30);
 534    pragma No_Return (Rcheck_32);
 535
 536    ---------------------------------------------
 537    -- Reason Strings for Run-Time Check Calls --
 538    ---------------------------------------------
 539
 540    --  These strings are null-terminated and are used by Rcheck_nn. The
 541    --  strings correspond to the definitions for Types.RT_Exception_Code.
 542
 543    use ASCII;
 544
 545    Rmsg_00 : constant String := "access check failed"              & NUL;
 546    Rmsg_01 : constant String := "access parameter is null"         & NUL;
 547    Rmsg_02 : constant String := "discriminant check failed"        & NUL;
 548    Rmsg_03 : constant String := "divide by zero"                   & NUL;
 549    Rmsg_04 : constant String := "explicit raise"                   & NUL;
 550    Rmsg_05 : constant String := "index check failed"               & NUL;
 551    Rmsg_06 : constant String := "invalid data"                     & NUL;
 552    Rmsg_07 : constant String := "length check failed"              & NUL;
 553    Rmsg_08 : constant String := "null Exception_Id"                & NUL;
 554    Rmsg_09 : constant String := "null-exclusion check failed"      & NUL;
 555    Rmsg_10 : constant String := "overflow check failed"            & NUL;
 556    Rmsg_11 : constant String := "partition check failed"           & NUL;
 557    Rmsg_12 : constant String := "range check failed"               & NUL;
 558    Rmsg_13 : constant String := "tag check failed"                 & NUL;
 559    Rmsg_14 : constant String := "access before elaboration"        & NUL;
 560    Rmsg_15 : constant String := "accessibility check failed"       & NUL;
 561    Rmsg_16 : constant String := "all guards closed"                & NUL;
 562    Rmsg_17 : constant String := "Current_Task referenced in entry" &
 563                                 " body"                            & NUL;
 564    Rmsg_18 : constant String := "duplicated entry address"         & NUL;
 565    Rmsg_19 : constant String := "explicit raise"                   & NUL;
 566    Rmsg_20 : constant String := "finalize/adjust raised exception" & NUL;
 567    Rmsg_21 : constant String := "implicit return with No_Return"   & NUL;
 568    Rmsg_22 : constant String := "misaligned address value"         & NUL;
 569    Rmsg_23 : constant String := "missing return"                   & NUL;
 570    Rmsg_24 : constant String := "overlaid controlled object"       & NUL;
 571    Rmsg_25 : constant String := "potentially blocking operation"   & NUL;
 572    Rmsg_26 : constant String := "stubbed subprogram called"        & NUL;
 573    Rmsg_27 : constant String := "unchecked union restriction"      & NUL;
 574    Rmsg_28 : constant String := "actual/returned class-wide value "
 575                                 & "not transportable"              & NUL;
 576    Rmsg_29 : constant String := "empty storage pool"               & NUL;
 577    Rmsg_30 : constant String := "explicit raise"                   & NUL;
 578    Rmsg_31 : constant String := "infinite recursion"               & NUL;
 579    Rmsg_32 : constant String := "object too large"                 & NUL;
 580
 581    -----------------------
 582    -- Polling Interface --
 583    -----------------------
 584
 585    type Unsigned is mod 2 ** 32;
 586
 587    Counter : Unsigned := 0;
 588    pragma Warnings (Off, Counter);
 589    --  This counter is provided for convenience. It can be used in Poll to
 590    --  perform periodic but not systematic operations.
 591
 592    procedure Poll is separate;
 593    --  The actual polling routine is separate, so that it can easily
 594    --  be replaced with a target dependent version.
 595
 596    --------------------------
 597    -- Code_Address_For_AAA --
 598    --------------------------
 599
 600    --  This function gives us the start of the PC range for addresses
 601    --  within the exception unit itself. We hope that gigi/gcc keep all the
 602    --  procedures in their original order!
 603
 604    function Code_Address_For_AAA return System.Address is
 605    begin
 606       --  We are using a label instead of merely using
 607       --  Code_Address_For_AAA'Address because on some platforms the latter
 608       --  does not yield the address we want, but the address of a stub or of
 609       --  a descriptor instead. This is the case at least on Alpha-VMS and
 610       --  PA-HPUX.
 611
 612       <<Start_Of_AAA>>
 613       return Start_Of_AAA'Address;
 614    end Code_Address_For_AAA;
 615
 616    ----------------
 617    -- Call_Chain --
 618    ----------------
 619
 620    procedure Call_Chain (Excep : EOA) is separate;
 621    --  The actual Call_Chain routine is separate, so that it can easily
 622    --  be dummied out when no exception traceback information is needed.
 623
 624    ------------------------------
 625    -- Current_Target_Exception --
 626    ------------------------------
 627
 628    function Current_Target_Exception return Exception_Occurrence is
 629    begin
 630       return Null_Occurrence;
 631    end Current_Target_Exception;
 632
 633    -------------------
 634    -- EId_To_String --
 635    -------------------
 636
 637    function EId_To_String (X : Exception_Id) return String
 638      renames Stream_Attributes.EId_To_String;
 639
 640    ------------------
 641    -- EO_To_String --
 642    ------------------
 643
 644    --  We use the null string to represent the null occurrence, otherwise
 645    --  we output the Exception_Information string for the occurrence.
 646
 647    function EO_To_String (X : Exception_Occurrence) return String
 648      renames Stream_Attributes.EO_To_String;
 649
 650    ------------------------
 651    -- Exception_Identity --
 652    ------------------------
 653
 654    function Exception_Identity
 655      (X : Exception_Occurrence) return Exception_Id
 656    is
 657    begin
 658       --  Note that the following test used to be here for the original
 659       --  Ada 95 semantics, but these were modified by AI-241 to require
 660       --  returning Null_Id instead of raising Constraint_Error.
 661
 662       --  if X.Id = Null_Id then
 663       --     raise Constraint_Error;
 664       --  end if;
 665
 666       return X.Id;
 667    end Exception_Identity;
 668
 669    ---------------------------
 670    -- Exception_Information --
 671    ---------------------------
 672
 673    function Exception_Information (X : Exception_Occurrence) return String is
 674    begin
 675       if X.Id = Null_Id then
 676          raise Constraint_Error;
 677       end if;
 678
 679       return Exception_Data.Exception_Information (X);
 680    end Exception_Information;
 681
 682    -----------------------
 683    -- Exception_Message --
 684    -----------------------
 685
 686    function Exception_Message (X : Exception_Occurrence) return String is
 687    begin
 688       if X.Id = Null_Id then
 689          raise Constraint_Error;
 690       end if;
 691
 692       return X.Msg (1 .. X.Msg_Length);
 693    end Exception_Message;
 694
 695    --------------------
 696    -- Exception_Name --
 697    --------------------
 698
 699    function Exception_Name (Id : Exception_Id) return String is
 700    begin
 701       if Id = null then
 702          raise Constraint_Error;
 703       end if;
 704
 705       return To_Ptr (Id.Full_Name) (1 .. Id.Name_Length - 1);
 706    end Exception_Name;
 707
 708    function Exception_Name (X : Exception_Occurrence) return String is
 709    begin
 710       return Exception_Name (X.Id);
 711    end Exception_Name;
 712
 713    ---------------------------
 714    -- Exception_Name_Simple --
 715    ---------------------------
 716
 717    function Exception_Name_Simple (X : Exception_Occurrence) return String is
 718       Name : constant String := Exception_Name (X);
 719       P    : Natural;
 720
 721    begin
 722       P := Name'Length;
 723       while P > 1 loop
 724          exit when Name (P - 1) = '.';
 725          P := P - 1;
 726       end loop;
 727
 728       --  Return result making sure lower bound is 1
 729
 730       declare
 731          subtype Rname is String (1 .. Name'Length - P + 1);
 732       begin
 733          return Rname (Name (P .. Name'Length));
 734       end;
 735    end Exception_Name_Simple;
 736
 737    --------------------
 738    -- Exception_Data --
 739    --------------------
 740
 741    package body Exception_Data is separate;
 742    --  This package can be easily dummied out if we do not want the
 743    --  basic support for exception messages (such as in Ada 83).
 744
 745    ---------------------------
 746    -- Exception_Propagation --
 747    ---------------------------
 748
 749    package body Exception_Propagation is separate;
 750    --  Depending on the actual exception mechanism used (front-end or
 751    --  back-end based), the implementation will differ, which is why this
 752    --  package is separated.
 753
 754    ----------------------
 755    -- Exception_Traces --
 756    ----------------------
 757
 758    package body Exception_Traces is separate;
 759    --  Depending on the underlying support for IO the implementation
 760    --  will differ. Moreover we would like to dummy out this package
 761    --  in case we do not want any exception tracing support. This is
 762    --  why this package is separated.
 763
 764    -----------------------
 765    -- Stream Attributes --
 766    -----------------------
 767
 768    package body Stream_Attributes is separate;
 769    --  This package can be easily dummied out if we do not want the
 770    --  support for streaming Exception_Ids and Exception_Occurrences.
 771
 772    ----------------------------
 773    -- Raise_Constraint_Error --
 774    ----------------------------
 775
 776    procedure Raise_Constraint_Error
 777      (File : System.Address;
 778       Line : Integer)
 779    is
 780    begin
 781       Raise_With_Location_And_Msg
 782         (Constraint_Error_Def'Access, File, Line);
 783    end Raise_Constraint_Error;
 784
 785    --------------------------------
 786    -- Raise_Constraint_Error_Msg --
 787    --------------------------------
 788
 789    procedure Raise_Constraint_Error_Msg
 790      (File : System.Address;
 791       Line : Integer;
 792       Msg  : System.Address)
 793    is
 794    begin
 795       Raise_With_Location_And_Msg
 796         (Constraint_Error_Def'Access, File, Line, Msg);
 797    end Raise_Constraint_Error_Msg;
 798
 799    -------------------------
 800    -- Raise_Current_Excep --
 801    -------------------------
 802
 803    procedure Raise_Current_Excep (E : Exception_Id) is
 804
 805       pragma Inspection_Point (E);
 806       --  This is so the debugger can reliably inspect the parameter when
 807       --  inserting a breakpoint at the start of this procedure.
 808
 809       --  To provide support for breakpoints on unhandled exceptions, the
 810       --  debugger will also need to be able to inspect the value of E from
 811       --  inner frames so we need to make sure that its value is also spilled
 812       --  on stack.  We take the address and dereference using volatile local
 813       --  objects for this purpose.
 814
 815       --  The pragma Warnings (Off) are needed because the compiler knows that
 816       --  these locals are not referenced and that this use of pragma Volatile
 817       --  is peculiar!
 818
 819       type EID_Access is access Exception_Id;
 820
 821       Access_To_E : EID_Access := E'Unrestricted_Access;
 822       pragma Volatile (Access_To_E);
 823       pragma Warnings (Off, Access_To_E);
 824
 825       Id : Exception_Id := Access_To_E.all;
 826       pragma Volatile (Id);
 827       pragma Warnings (Off, Id);
 828
 829    begin
 830       Debug_Raise_Exception (E => SSL.Exception_Data_Ptr (E));
 831       Exception_Propagation.Propagate_Exception
 832         (E => E, From_Signal_Handler => False);
 833    end Raise_Current_Excep;
 834
 835    ---------------------
 836    -- Raise_Exception --
 837    ---------------------
 838
 839    procedure Raise_Exception
 840      (E       : Exception_Id;
 841       Message : String := "")
 842    is
 843    begin
 844       if E /= null then
 845          Exception_Data.Set_Exception_Msg (E, Message);
 846          Abort_Defer.all;
 847          Raise_Current_Excep (E);
 848       end if;
 849
 850       --  Note: if E is null, then we simply return, which is correct Ada 95
 851       --  semantics. If we are operating in Ada 2005 mode, then the expander
 852       --  generates a raise Constraint_Error immediately following the call
 853       --  to provide the required Ada 2005 semantics (see AI-329). We do it
 854       --  this way to avoid having run time dependencies on the Ada version.
 855
 856       return;
 857    end Raise_Exception;
 858
 859    ----------------------------
 860    -- Raise_Exception_Always --
 861    ----------------------------
 862
 863    procedure Raise_Exception_Always
 864      (E       : Exception_Id;
 865       Message : String := "")
 866    is
 867    begin
 868       Exception_Data.Set_Exception_Msg (E, Message);
 869       Abort_Defer.all;
 870       Raise_Current_Excep (E);
 871    end Raise_Exception_Always;
 872
 873    -------------------------------------
 874    -- Raise_From_Controlled_Operation --
 875    -------------------------------------
 876
 877    procedure Raise_From_Controlled_Operation
 878      (X : Ada.Exceptions.Exception_Occurrence)
 879    is
 880       Prefix   : constant String := "adjust/finalize raised ";
 881       Orig_Msg : constant String := Exception_Message (X);
 882       New_Msg  : constant String := Prefix & Exception_Name (X);
 883
 884    begin
 885       if Orig_Msg'Length >= Prefix'Length
 886         and then
 887           Orig_Msg (Orig_Msg'First .. Orig_Msg'First + Prefix'Length - 1) =
 888                                                                      Prefix
 889       then
 890          --  Message already has proper prefix, just re-reraise PROGRAM_ERROR
 891
 892          Raise_Exception_No_Defer
 893            (E       => Program_Error'Identity,
 894             Message => Orig_Msg);
 895
 896       elsif Orig_Msg = "" then
 897
 898          --  No message present: just provide our own
 899
 900          Raise_Exception_No_Defer
 901            (E       => Program_Error'Identity,
 902             Message => New_Msg);
 903
 904       else
 905          --  Message present, add informational prefix
 906
 907          Raise_Exception_No_Defer
 908            (E       => Program_Error'Identity,
 909             Message => New_Msg & ": " & Orig_Msg);
 910       end if;
 911    end Raise_From_Controlled_Operation;
 912
 913    -------------------------------
 914    -- Raise_From_Signal_Handler --
 915    -------------------------------
 916
 917    procedure Raise_From_Signal_Handler
 918      (E : Exception_Id;
 919       M : System.Address)
 920    is
 921    begin
 922       Exception_Data.Set_Exception_C_Msg (E, M);
 923       Abort_Defer.all;
 924       Exception_Propagation.Propagate_Exception
 925         (E => E, From_Signal_Handler => True);
 926    end Raise_From_Signal_Handler;
 927
 928    -------------------------
 929    -- Raise_Program_Error --
 930    -------------------------
 931
 932    procedure Raise_Program_Error
 933      (File : System.Address;
 934       Line : Integer)
 935    is
 936    begin
 937       Raise_With_Location_And_Msg
 938         (Program_Error_Def'Access, File, Line);
 939    end Raise_Program_Error;
 940
 941    -----------------------------
 942    -- Raise_Program_Error_Msg --
 943    -----------------------------
 944
 945    procedure Raise_Program_Error_Msg
 946      (File : System.Address;
 947       Line : Integer;
 948       Msg  : System.Address)
 949    is
 950    begin
 951       Raise_With_Location_And_Msg
 952         (Program_Error_Def'Access, File, Line, Msg);
 953    end Raise_Program_Error_Msg;
 954
 955    -------------------------
 956    -- Raise_Storage_Error --
 957    -------------------------
 958
 959    procedure Raise_Storage_Error
 960      (File : System.Address;
 961       Line : Integer)
 962    is
 963    begin
 964       Raise_With_Location_And_Msg
 965         (Storage_Error_Def'Access, File, Line);
 966    end Raise_Storage_Error;
 967
 968    -----------------------------
 969    -- Raise_Storage_Error_Msg --
 970    -----------------------------
 971
 972    procedure Raise_Storage_Error_Msg
 973      (File : System.Address;
 974       Line : Integer;
 975       Msg  : System.Address)
 976    is
 977    begin
 978       Raise_With_Location_And_Msg
 979         (Storage_Error_Def'Access, File, Line, Msg);
 980    end Raise_Storage_Error_Msg;
 981
 982    ---------------------------------
 983    -- Raise_With_Location_And_Msg --
 984    ---------------------------------
 985
 986    procedure Raise_With_Location_And_Msg
 987      (E : Exception_Id;
 988       F : System.Address;
 989       L : Integer;
 990       M : System.Address := System.Null_Address)
 991    is
 992    begin
 993       Exception_Data.Set_Exception_C_Msg (E, F, L, M);
 994       Abort_Defer.all;
 995       Raise_Current_Excep (E);
 996    end Raise_With_Location_And_Msg;
 997
 998    --------------------
 999    -- Raise_With_Msg --
1000    --------------------
1001
1002    procedure Raise_With_Msg (E : Exception_Id) is
1003       Excep : constant EOA := Get_Current_Excep.all;
1004
1005    begin
1006       Exception_Propagation.Setup_Exception (Excep, Excep);
1007
1008       Excep.Exception_Raised := False;
1009       Excep.Id               := E;
1010       Excep.Num_Tracebacks   := 0;
1011       Excep.Cleanup_Flag     := False;
1012       Excep.Pid              := Local_Partition_ID;
1013       Abort_Defer.all;
1014       Raise_Current_Excep (E);
1015    end Raise_With_Msg;
1016
1017    --------------------------------------
1018    -- Calls to Run-Time Check Routines --
1019    --------------------------------------
1020
1021    procedure Rcheck_00 (File : System.Address; Line : Integer) is
1022    begin
1023       Raise_Constraint_Error_Msg (File, Line, Rmsg_00'Address);
1024    end Rcheck_00;
1025
1026    procedure Rcheck_01 (File : System.Address; Line : Integer) is
1027    begin
1028       Raise_Constraint_Error_Msg (File, Line, Rmsg_01'Address);
1029    end Rcheck_01;
1030
1031    procedure Rcheck_02 (File : System.Address; Line : Integer) is
1032    begin
1033       Raise_Constraint_Error_Msg (File, Line, Rmsg_02'Address);
1034    end Rcheck_02;
1035
1036    procedure Rcheck_03 (File : System.Address; Line : Integer) is
1037    begin
1038       Raise_Constraint_Error_Msg (File, Line, Rmsg_03'Address);
1039    end Rcheck_03;
1040
1041    procedure Rcheck_04 (File : System.Address; Line : Integer) is
1042    begin
1043       Raise_Constraint_Error_Msg (File, Line, Rmsg_04'Address);
1044    end Rcheck_04;
1045
1046    procedure Rcheck_05 (File : System.Address; Line : Integer) is
1047    begin
1048       Raise_Constraint_Error_Msg (File, Line, Rmsg_05'Address);
1049    end Rcheck_05;
1050
1051    procedure Rcheck_06 (File : System.Address; Line : Integer) is
1052    begin
1053       Raise_Constraint_Error_Msg (File, Line, Rmsg_06'Address);
1054    end Rcheck_06;
1055
1056    procedure Rcheck_07 (File : System.Address; Line : Integer) is
1057    begin
1058       Raise_Constraint_Error_Msg (File, Line, Rmsg_07'Address);
1059    end Rcheck_07;
1060
1061    procedure Rcheck_08 (File : System.Address; Line : Integer) is
1062    begin
1063       Raise_Constraint_Error_Msg (File, Line, Rmsg_08'Address);
1064    end Rcheck_08;
1065
1066    procedure Rcheck_09 (File : System.Address; Line : Integer) is
1067    begin
1068       Raise_Constraint_Error_Msg (File, Line, Rmsg_09'Address);
1069    end Rcheck_09;
1070
1071    procedure Rcheck_10 (File : System.Address; Line : Integer) is
1072    begin
1073       Raise_Constraint_Error_Msg (File, Line, Rmsg_10'Address);
1074    end Rcheck_10;
1075
1076    procedure Rcheck_11 (File : System.Address; Line : Integer) is
1077    begin
1078       Raise_Constraint_Error_Msg (File, Line, Rmsg_11'Address);
1079    end Rcheck_11;
1080
1081    procedure Rcheck_12 (File : System.Address; Line : Integer) is
1082    begin
1083       Raise_Constraint_Error_Msg (File, Line, Rmsg_12'Address);
1084    end Rcheck_12;
1085
1086    procedure Rcheck_13 (File : System.Address; Line : Integer) is
1087    begin
1088       Raise_Constraint_Error_Msg (File, Line, Rmsg_13'Address);
1089    end Rcheck_13;
1090
1091    procedure Rcheck_14 (File : System.Address; Line : Integer) is
1092    begin
1093       Raise_Program_Error_Msg (File, Line, Rmsg_14'Address);
1094    end Rcheck_14;
1095
1096    procedure Rcheck_15 (File : System.Address; Line : Integer) is
1097    begin
1098       Raise_Program_Error_Msg (File, Line, Rmsg_15'Address);
1099    end Rcheck_15;
1100
1101    procedure Rcheck_16 (File : System.Address; Line : Integer) is
1102    begin
1103       Raise_Program_Error_Msg (File, Line, Rmsg_16'Address);
1104    end Rcheck_16;
1105
1106    procedure Rcheck_17 (File : System.Address; Line : Integer) is
1107    begin
1108       Raise_Program_Error_Msg (File, Line, Rmsg_17'Address);
1109    end Rcheck_17;
1110
1111    procedure Rcheck_18 (File : System.Address; Line : Integer) is
1112    begin
1113       Raise_Program_Error_Msg (File, Line, Rmsg_18'Address);
1114    end Rcheck_18;
1115
1116    procedure Rcheck_19 (File : System.Address; Line : Integer) is
1117    begin
1118       Raise_Program_Error_Msg (File, Line, Rmsg_19'Address);
1119    end Rcheck_19;
1120
1121    procedure Rcheck_20 (File : System.Address; Line : Integer) is
1122    begin
1123       Raise_Program_Error_Msg (File, Line, Rmsg_20'Address);
1124    end Rcheck_20;
1125
1126    procedure Rcheck_21 (File : System.Address; Line : Integer) is
1127    begin
1128       Raise_Program_Error_Msg (File, Line, Rmsg_21'Address);
1129    end Rcheck_21;
1130
1131    procedure Rcheck_22 (File : System.Address; Line : Integer) is
1132    begin
1133       Raise_Program_Error_Msg (File, Line, Rmsg_22'Address);
1134    end Rcheck_22;
1135
1136    procedure Rcheck_23 (File : System.Address; Line : Integer) is
1137    begin
1138       Raise_Program_Error_Msg (File, Line, Rmsg_23'Address);
1139    end Rcheck_23;
1140
1141    procedure Rcheck_24 (File : System.Address; Line : Integer) is
1142    begin
1143       Raise_Program_Error_Msg (File, Line, Rmsg_24'Address);
1144    end Rcheck_24;
1145
1146    procedure Rcheck_25 (File : System.Address; Line : Integer) is
1147    begin
1148       Raise_Program_Error_Msg (File, Line, Rmsg_25'Address);
1149    end Rcheck_25;
1150
1151    procedure Rcheck_26 (File : System.Address; Line : Integer) is
1152    begin
1153       Raise_Program_Error_Msg (File, Line, Rmsg_26'Address);
1154    end Rcheck_26;
1155
1156    procedure Rcheck_27 (File : System.Address; Line : Integer) is
1157    begin
1158       Raise_Program_Error_Msg (File, Line, Rmsg_27'Address);
1159    end Rcheck_27;
1160
1161    procedure Rcheck_28 (File : System.Address; Line : Integer) is
1162    begin
1163       Raise_Program_Error_Msg (File, Line, Rmsg_28'Address);
1164    end Rcheck_28;
1165
1166    procedure Rcheck_29 (File : System.Address; Line : Integer) is
1167    begin
1168       Raise_Storage_Error_Msg (File, Line, Rmsg_29'Address);
1169    end Rcheck_29;
1170
1171    procedure Rcheck_30 (File : System.Address; Line : Integer) is
1172    begin
1173       Raise_Storage_Error_Msg (File, Line, Rmsg_30'Address);
1174    end Rcheck_30;
1175
1176    procedure Rcheck_31 (File : System.Address; Line : Integer) is
1177    begin
1178       Raise_Storage_Error_Msg (File, Line, Rmsg_31'Address);
1179    end Rcheck_31;
1180
1181    procedure Rcheck_32 (File : System.Address; Line : Integer) is
1182    begin
1183       Raise_Storage_Error_Msg (File, Line, Rmsg_32'Address);
1184    end Rcheck_32;
1185
1186    -------------
1187    -- Reraise --
1188    -------------
1189
1190    procedure Reraise is
1191       Excep : constant EOA := Get_Current_Excep.all;
1192
1193    begin
1194       Abort_Defer.all;
1195       Exception_Propagation.Setup_Exception (Excep, Excep, Reraised => True);
1196       Raise_Current_Excep (Excep.Id);
1197    end Reraise;
1198
1199    ------------------------
1200    -- Reraise_Occurrence --
1201    ------------------------
1202
1203    procedure Reraise_Occurrence (X : Exception_Occurrence) is
1204    begin
1205       if X.Id /= null then
1206          Abort_Defer.all;
1207          Exception_Propagation.Setup_Exception
1208            (X'Unrestricted_Access, Get_Current_Excep.all, Reraised => True);
1209          Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1210          Raise_Current_Excep (X.Id);
1211       end if;
1212    end Reraise_Occurrence;
1213
1214    -------------------------------
1215    -- Reraise_Occurrence_Always --
1216    -------------------------------
1217
1218    procedure Reraise_Occurrence_Always (X : Exception_Occurrence) is
1219    begin
1220       Abort_Defer.all;
1221       Exception_Propagation.Setup_Exception
1222         (X'Unrestricted_Access, Get_Current_Excep.all, Reraised => True);
1223       Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1224       Raise_Current_Excep (X.Id);
1225    end Reraise_Occurrence_Always;
1226
1227    ---------------------------------
1228    -- Reraise_Occurrence_No_Defer --
1229    ---------------------------------
1230
1231    procedure Reraise_Occurrence_No_Defer (X : Exception_Occurrence) is
1232    begin
1233       Exception_Propagation.Setup_Exception
1234         (X'Unrestricted_Access, Get_Current_Excep.all, Reraised => True);
1235       Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1236       Raise_Current_Excep (X.Id);
1237    end Reraise_Occurrence_No_Defer;
1238
1239    ---------------------
1240    -- Save_Occurrence --
1241    ---------------------
1242
1243    procedure Save_Occurrence
1244      (Target : out Exception_Occurrence;
1245       Source : Exception_Occurrence)
1246    is
1247    begin
1248       Save_Occurrence_No_Private (Target, Source);
1249    end Save_Occurrence;
1250
1251    function Save_Occurrence (Source : Exception_Occurrence) return EOA is
1252       Target : constant EOA := new Exception_Occurrence;
1253    begin
1254       Save_Occurrence (Target.all, Source);
1255       return Target;
1256    end Save_Occurrence;
1257
1258    --------------------------------
1259    -- Save_Occurrence_No_Private --
1260    --------------------------------
1261
1262    procedure Save_Occurrence_No_Private
1263      (Target : out Exception_Occurrence;
1264       Source : Exception_Occurrence)
1265    is
1266    begin
1267       Target.Id             := Source.Id;
1268       Target.Msg_Length     := Source.Msg_Length;
1269       Target.Num_Tracebacks := Source.Num_Tracebacks;
1270       Target.Pid            := Source.Pid;
1271       Target.Cleanup_Flag   := Source.Cleanup_Flag;
1272
1273       Target.Msg (1 .. Target.Msg_Length) :=
1274         Source.Msg (1 .. Target.Msg_Length);
1275
1276       Target.Tracebacks (1 .. Target.Num_Tracebacks) :=
1277         Source.Tracebacks (1 .. Target.Num_Tracebacks);
1278    end Save_Occurrence_No_Private;
1279
1280    -------------------------
1281    -- Transfer_Occurrence --
1282    -------------------------
1283
1284    procedure Transfer_Occurrence
1285      (Target : Exception_Occurrence_Access;
1286       Source : Exception_Occurrence)
1287    is
1288    begin
1289       --  Setup Target as an exception to be propagated in the calling task
1290       --  (rendezvous-wise), taking care not to clobber the associated private
1291       --  data.  Target is expected to be a pointer to the calling task's
1292       --  fixed TSD occurrence, which is very different from Get_Current_Excep
1293       --  here because this subprogram is called from the called task.
1294
1295       Exception_Propagation.Setup_Exception (Target, Target);
1296       Save_Occurrence_No_Private (Target.all, Source);
1297    end Transfer_Occurrence;
1298
1299    -------------------
1300    -- String_To_EId --
1301    -------------------
1302
1303    function String_To_EId (S : String) return Exception_Id
1304      renames Stream_Attributes.String_To_EId;
1305
1306    ------------------
1307    -- String_To_EO --
1308    ------------------
1309
1310    function String_To_EO (S : String) return Exception_Occurrence
1311      renames Stream_Attributes.String_To_EO;
1312
1313    ------------------------------
1314    -- Raise_Exception_No_Defer --
1315    ------------------------------
1316
1317    procedure Raise_Exception_No_Defer
1318      (E       : Exception_Id;
1319       Message : String := "")
1320    is
1321    begin
1322       Exception_Data.Set_Exception_Msg (E, Message);
1323
1324       --  Do not call Abort_Defer.all, as specified by the spec
1325
1326       Raise_Current_Excep (E);
1327    end Raise_Exception_No_Defer;
1328
1329    ---------------
1330    -- To_Stderr --
1331    ---------------
1332
1333    procedure To_Stderr (C : Character) is
1334
1335       type int is new Integer;
1336
1337       procedure put_char_stderr (C : int);
1338       pragma Import (C, put_char_stderr, "put_char_stderr");
1339
1340    begin
1341       put_char_stderr (Character'Pos (C));
1342    end To_Stderr;
1343
1344    procedure To_Stderr (S : String) is
1345    begin
1346       for J in S'Range loop
1347          if S (J) /= ASCII.CR then
1348             To_Stderr (S (J));
1349          end if;
1350       end loop;
1351    end To_Stderr;
1352
1353    -------------------------
1354    -- Wide_Exception_Name --
1355    -------------------------
1356
1357    WC_Encoding : Character;
1358    pragma Import (C, WC_Encoding, "__gl_wc_encoding");
1359    --  Encoding method for source, as exported by binder
1360
1361    function Wide_Exception_Name
1362      (Id : Exception_Id) return Wide_String
1363    is
1364       S : constant String := Exception_Name (Id);
1365       W : Wide_String (1 .. S'Length);
1366       L : Natural;
1367    begin
1368       String_To_Wide_String
1369         (S, W, L, Get_WC_Encoding_Method (WC_Encoding));
1370       return W (1 .. L);
1371    end Wide_Exception_Name;
1372
1373    function Wide_Exception_Name
1374      (X : Exception_Occurrence) return Wide_String
1375    is
1376       S : constant String := Exception_Name (X);
1377       W : Wide_String (1 .. S'Length);
1378       L : Natural;
1379    begin
1380       String_To_Wide_String
1381         (S, W, L, Get_WC_Encoding_Method (WC_Encoding));
1382       return W (1 .. L);
1383    end Wide_Exception_Name;
1384
1385    ----------------------------
1386    -- Wide_Wide_Exception_Name --
1387    -----------------------------
1388
1389    function Wide_Wide_Exception_Name
1390      (Id : Exception_Id) return Wide_Wide_String
1391    is
1392       S : constant String := Exception_Name (Id);
1393       W : Wide_Wide_String (1 .. S'Length);
1394       L : Natural;
1395    begin
1396       String_To_Wide_Wide_String
1397         (S, W, L, Get_WC_Encoding_Method (WC_Encoding));
1398       return W (1 .. L);
1399    end Wide_Wide_Exception_Name;
1400
1401    function Wide_Wide_Exception_Name
1402      (X : Exception_Occurrence) return Wide_Wide_String
1403    is
1404       S : constant String := Exception_Name (X);
1405       W : Wide_Wide_String (1 .. S'Length);
1406       L : Natural;
1407    begin
1408       String_To_Wide_Wide_String
1409         (S, W, L, Get_WC_Encoding_Method (WC_Encoding));
1410       return W (1 .. L);
1411    end Wide_Wide_Exception_Name;
1412
1413    --------------------------
1414    -- Code_Address_For_ZZZ --
1415    --------------------------
1416
1417    --  This function gives us the end of the PC range for addresses
1418    --  within the exception unit itself. We hope that gigi/gcc keeps all the
1419    --  procedures in their original order!
1420
1421    function Code_Address_For_ZZZ return System.Address is
1422    begin
1423       <<Start_Of_ZZZ>>
1424       return Start_Of_ZZZ'Address;
1425    end Code_Address_For_ZZZ;
1426
1427 end Ada.Exceptions;