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) 1992-2005, 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 pragma Polling (Off);
  35 --  We must turn polling off for this unit, because otherwise we get
  36 --  elaboration circularities with System.Exception_Tables.
  37
  38 with System;                  use System;
  39 with System.Standard_Library; use System.Standard_Library;
  40 with System.Soft_Links;       use System.Soft_Links;
  41
  42 package body Ada.Exceptions is
  43
  44    pragma Suppress (All_Checks);
  45    --  We definitely do not want exceptions occurring within this unit, or
  46    --  we are in big trouble. If an exceptional situation does occur, better
  47    --  that it not be raised, since raising it can cause confusing chaos.
  48
  49    -----------------------
  50    -- Local Subprograms --
  51    -----------------------
  52
  53    --  Note: the exported subprograms in this package body are called directly
  54    --  from C clients using the given external name, even though they are not
  55    --  technically visible in the Ada sense.
  56
  57    function Code_Address_For_AAA return System.Address;
  58    function Code_Address_For_ZZZ return System.Address;
  59    --  Return start and end of procedures in this package
  60    --
  61    --  These procedures are used to provide exclusion bounds in
  62    --  calls to Call_Chain at exception raise points from this unit. The
  63    --  purpose is to arrange for the exception tracebacks not to include
  64    --  frames from routines involved in the raise process, as these are
  65    --  meaningless from the user's standpoint.
  66    --
  67    --  For these bounds to be meaningful, we need to ensure that the object
  68    --  code for the routines involved in processing a raise is located after
  69    --  the object code Code_Address_For_AAA and before the object code
  70    --  Code_Address_For_ZZZ. This will indeed be the case as long as the
  71    --  following rules are respected:
  72    --
  73    --  1) The bodies of the subprograms involved in processing a raise
  74    --     are located after the body of Code_Address_For_AAA and before the
  75    --     body of Code_Address_For_ZZZ.
  76    --
  77    --  2) No pragma Inline applies to any of these subprograms, as this
  78    --     could delay the corresponding assembly output until the end of
  79    --     the unit.
  80
  81    procedure Call_Chain (Excep : EOA);
  82    --  Store up to Max_Tracebacks in Excep, corresponding to the current
  83    --  call chain.
  84
  85    procedure Process_Raise_Exception
  86      (E                   : Exception_Id;
  87       From_Signal_Handler : Boolean);
  88    pragma No_Return (Process_Raise_Exception);
  89    --  This is the lowest level raise routine. It raises the exception
  90    --  referenced by Current_Excep.all in the TSD, without deferring abort
  91    --  (the caller must ensure that abort is deferred on entry).
  92    --
  93    --  This is the common implementation for Raise_Current_Excep and
  94    --  Raise_From_Signal_Handler. The origin of the call is indicated by the
  95    --  From_Signal_Handler argument.
  96
  97    procedure To_Stderr (S : String);
  98    pragma Export (Ada, To_Stderr, "__gnat_to_stderr");
  99    --  Little routine to output string to stderr that is also used
 100    --  in the tasking run time.
 101
 102    procedure To_Stderr (C : Character);
 103    pragma Inline (To_Stderr);
 104    pragma Export (Ada, To_Stderr, "__gnat_to_stderr_char");
 105    --  Little routine to output a character to stderr, used by some of
 106    --  the separate units below.
 107
 108    package Exception_Data is
 109
 110       ---------------------------------
 111       -- Exception messages routines --
 112       ---------------------------------
 113
 114       procedure Set_Exception_C_Msg
 115         (Id   : Exception_Id;
 116          Msg1 : System.Address;
 117          Line : Integer        := 0;
 118          Msg2 : System.Address := System.Null_Address);
 119       --  This routine is called to setup the exception referenced by the
 120       --  Current_Excep field in the TSD to contain the indicated Id value
 121       --  and message. Msg1 is a null terminated string which is generated
 122       --  as the exception message. If line is non-zero, then a colon and
 123       --  the decimal representation of this integer is appended to the
 124       --  message. When Msg2 is non-null, a space and this additional null
 125       --  terminated string is added to the message.
 126
 127       procedure Set_Exception_Msg
 128         (Id      : Exception_Id;
 129          Message : String);
 130       --  This routine is called to setup the exception referenced by the
 131       --  Current_Excep field in the TSD to contain the indicated Id value
 132       --  and message. Message is a string which is generated as the
 133       --  exception message.
 134
 135       --------------------------------------
 136       -- Exception information subprogram --
 137       --------------------------------------
 138
 139       function Exception_Information (X : Exception_Occurrence) return String;
 140       --  The format of the exception information is as follows:
 141       --
 142       --    Exception_Name: <exception name> (as in Exception_Name)
 143       --    Message: <message> (only if Exception_Message is empty)
 144       --    PID=nnnn (only if != 0)
 145       --    Call stack traceback locations:  (only if at least one location)
 146       --    <0xyyyyyyyy 0xyyyyyyyy ...>      (is recorded)
 147       --
 148       --  The lines are separated by a ASCII.LF character.
 149       --  The nnnn is the partition Id given as decimal digits.
 150       --  The 0x... line represents traceback program counter locations, in
 151       --  execution order with the first one being the exception location. It
 152       --  is present only
 153       --
 154       --  The Exception_Name and Message lines are omitted in the abort
 155       --  signal case, since this is not really an exception.
 156
 157       --  !! If the format of the generated string is changed, please note
 158       --  !! that an equivalent modification to the routine String_To_EO must
 159       --  !! be made to preserve proper functioning of the stream attributes.
 160
 161       ---------------------------------------
 162       -- Exception backtracing subprograms --
 163       ---------------------------------------
 164
 165       --  What is automatically output when exception tracing is on is the
 166       --  usual exception information with the call chain backtrace possibly
 167       --  tailored by a backtrace decorator. Modifying Exception_Information
 168       --  itself is not a good idea because the decorated output is completely
 169       --  out of control and would break all our code related to the streaming
 170       --  of exceptions.  We then provide an alternative function to compute
 171       --  the possibly tailored output, which is equivalent if no decorator is
 172       --  currently set:
 173
 174       function Tailored_Exception_Information
 175         (X : Exception_Occurrence) return String;
 176       --  Exception information to be output in the case of automatic tracing
 177       --  requested through GNAT.Exception_Traces.
 178       --
 179       --  This is the same as Exception_Information if no backtrace decorator
 180       --  is currently in place. Otherwise, this is Exception_Information with
 181       --  the call chain raw addresses replaced by the result of a call to the
 182       --  current decorator provided with the call chain addresses.
 183
 184       pragma Export
 185         (Ada, Tailored_Exception_Information,
 186            "__gnat_tailored_exception_information");
 187       --  This is currently used by System.Tasking.Stages
 188
 189    end Exception_Data;
 190
 191    package Exception_Traces is
 192
 193       use Exception_Data;
 194       --  Imports Tailored_Exception_Information
 195
 196       ----------------------------------------------
 197       -- Run-Time Exception Notification Routines --
 198       ----------------------------------------------
 199
 200       --  These subprograms provide a common run-time interface to trigger the
 201       --  actions required when an exception is about to be propagated (e.g.
 202       --  user specified actions or output of exception information). They are
 203       --  exported to be usable by the Ada exception handling personality
 204       --  routine when the GCC 3 mechanism is used.
 205
 206       procedure Notify_Handled_Exception;
 207       pragma Export
 208         (C, Notify_Handled_Exception, "__gnat_notify_handled_exception");
 209       --  This routine is called for a handled occurrence is about to be
 210       --  propagated.
 211
 212       procedure Notify_Unhandled_Exception;
 213       pragma Export
 214         (C, Notify_Unhandled_Exception, "__gnat_notify_unhandled_exception");
 215       --  This routine is called when an unhandled occurrence is about to be
 216       --  propagated.
 217
 218       procedure Unhandled_Exception_Terminate;
 219       pragma No_Return (Unhandled_Exception_Terminate);
 220       --  This procedure is called to terminate execution following an
 221       --  unhandled exception. The exception information, including
 222       --  traceback if available is output, and execution is then
 223       --  terminated. Note that at the point where this routine is
 224       --  called, the stack has typically been destroyed.
 225
 226    end Exception_Traces;
 227
 228    package Exception_Propagation is
 229
 230       use Exception_Traces;
 231       --  Imports Notify_Unhandled_Exception and
 232       --  Unhandled_Exception_Terminate
 233
 234       ------------------------------------
 235       -- Exception propagation routines --
 236       ------------------------------------
 237
 238       procedure Setup_Exception
 239         (Excep    : EOA;
 240          Current  : EOA;
 241          Reraised : Boolean := False);
 242       --  Perform the necessary operations to prepare the propagation of Excep
 243       --  in a task where Current is the current occurrence. Excep is assumed
 244       --  to be a valid (non null) pointer.
 245       --
 246       --  This should be called before any (re-)setting of the current
 247       --  occurrence. Any such (re-)setting shall take care *not* to clobber
 248       --  the Private_Data component.
 249       --
 250       --  Having Current provided as an argument (instead of retrieving it via
 251       --  Get_Current_Excep internally) is required to allow one task to setup
 252       --  an exception for another task, which is used by Transfer_Occurrence.
 253
 254       procedure Propagate_Exception (From_Signal_Handler : Boolean);
 255       pragma No_Return (Propagate_Exception);
 256       --  This procedure propagates the exception represented by the occurrence
 257       --  referenced by Current_Excep in the TSD for the current task.
 258
 259    end Exception_Propagation;
 260
 261    package Stream_Attributes is
 262
 263       --------------------------------
 264       -- Stream attributes routines --
 265       --------------------------------
 266
 267       function EId_To_String (X : Exception_Id) return String;
 268       function String_To_EId (S : String) return Exception_Id;
 269       --  Functions for implementing Exception_Id stream attributes
 270
 271       function EO_To_String (X : Exception_Occurrence) return String;
 272       function String_To_EO (S : String) return Exception_Occurrence;
 273       --  Functions for implementing Exception_Occurrence stream
 274       --  attributes
 275
 276    end Stream_Attributes;
 277
 278    procedure Raise_Current_Excep (E : Exception_Id);
 279    pragma No_Return (Raise_Current_Excep);
 280    pragma Export (C, Raise_Current_Excep, "__gnat_raise_nodefer_with_msg");
 281    --  This is a simple wrapper to Process_Raise_Exception setting the
 282    --  From_Signal_Handler argument to False.
 283    --
 284    --  This external name for Raise_Current_Excep is historical, and probably
 285    --  should be changed but for now we keep it, because gdb and gigi know
 286    --  about it.
 287
 288    procedure Raise_Exception_No_Defer
 289       (E : Exception_Id; Message : String := "");
 290    pragma Export
 291     (Ada, Raise_Exception_No_Defer,
 292      "ada__exceptions__raise_exception_no_defer");
 293    pragma No_Return (Raise_Exception_No_Defer);
 294    --  Similar to Raise_Exception, but with no abort deferral
 295
 296    procedure Raise_With_Msg (E : Exception_Id);
 297    pragma No_Return (Raise_With_Msg);
 298    pragma Export (C, Raise_With_Msg, "__gnat_raise_with_msg");
 299    --  Raises an exception with given exception id value. A message
 300    --  is associated with the raise, and has already been stored in the
 301    --  exception occurrence referenced by the Current_Excep in the TSD.
 302    --  Abort is deferred before the raise call.
 303
 304    procedure Raise_With_Location_And_Msg
 305      (E : Exception_Id;
 306       F : System.Address;
 307       L : Integer;
 308       M : System.Address := System.Null_Address);
 309    pragma No_Return (Raise_With_Location_And_Msg);
 310    --  Raise an exception with given exception id value. A filename and line
 311    --  number is associated with the raise and is stored in the exception
 312    --  occurrence and in addition a string message M is appended to
 313    --  this (if M is not null).
 314
 315    procedure Raise_Constraint_Error
 316      (File : System.Address;
 317       Line : Integer);
 318    pragma No_Return (Raise_Constraint_Error);
 319    pragma Export
 320      (C, Raise_Constraint_Error, "__gnat_raise_constraint_error");
 321    --  Raise constraint error with file:line information
 322
 323    procedure Raise_Constraint_Error_Msg
 324      (File : System.Address;
 325       Line : Integer;
 326       Msg  : System.Address);
 327    pragma No_Return (Raise_Constraint_Error_Msg);
 328    pragma Export
 329      (C, Raise_Constraint_Error_Msg, "__gnat_raise_constraint_error_msg");
 330    --  Raise constraint error with file:line + msg information
 331
 332    procedure Raise_Program_Error
 333      (File : System.Address;
 334       Line : Integer);
 335    pragma No_Return (Raise_Program_Error);
 336    pragma Export
 337      (C, Raise_Program_Error, "__gnat_raise_program_error");
 338    --  Raise program error with file:line information
 339
 340    procedure Raise_Program_Error_Msg
 341      (File : System.Address;
 342       Line : Integer;
 343       Msg  : System.Address);
 344    pragma No_Return (Raise_Program_Error_Msg);
 345    pragma Export
 346      (C, Raise_Program_Error_Msg, "__gnat_raise_program_error_msg");
 347    --  Raise program error with file:line + msg information
 348
 349    procedure Raise_Storage_Error
 350      (File : System.Address;
 351       Line : Integer);
 352    pragma No_Return (Raise_Storage_Error);
 353    pragma Export
 354      (C, Raise_Storage_Error, "__gnat_raise_storage_error");
 355    --  Raise storage error with file:line information
 356
 357    procedure Raise_Storage_Error_Msg
 358      (File : System.Address;
 359       Line : Integer;
 360       Msg  : System.Address);
 361    pragma No_Return (Raise_Storage_Error_Msg);
 362    pragma Export
 363      (C, Raise_Storage_Error_Msg, "__gnat_raise_storage_error_msg");
 364    --  Raise storage error with file:line + reason msg information
 365
 366    --  The exception raising process and the automatic tracing mechanism rely
 367    --  on some careful use of flags attached to the exception occurrence. The
 368    --  graph below illustrates the relations between the Raise_ subprograms
 369    --  and identifies the points where basic flags such as Exception_Raised
 370    --  are initialized.
 371    --
 372    --  (i) signs indicate the flags initialization points. R stands for Raise,
 373    --  W for With, and E for Exception.
 374    --
 375    --                   R_No_Msg    R_E   R_Pe  R_Ce  R_Se
 376    --                       |        |     |     |     |
 377    --                       +--+  +--+     +---+ | +---+
 378    --                          |  |            | | |
 379    --     R_E_No_Defer(i)    R_W_Msg(i)       R_W_Loc
 380    --           |               |              |   |
 381    --           +------------+  |  +-----------+   +--+
 382    --                        |  |  |                  |
 383    --                        |  |  |             Set_E_C_Msg(i)
 384    --                        |  |  |
 385    --                   Raise_Current_Excep
 386
 387    procedure Reraise;
 388    pragma No_Return (Reraise);
 389    pragma Export (C, Reraise, "__gnat_reraise");
 390    --  Reraises the exception referenced by the Current_Excep field of
 391    --  the TSD (all fields of this exception occurrence are set). Abort
 392    --  is deferred before the reraise operation.
 393
 394    --  Save_Occurrence variations: As the management of the private data
 395    --  attached to occurrences is delicate, wether or not pointers to such
 396    --  data has to be copied in various situations is better made explicit.
 397    --  The following procedures provide an internal interface to help making
 398    --  this explicit.
 399
 400    procedure Save_Occurrence_No_Private
 401      (Target : out Exception_Occurrence;
 402       Source : Exception_Occurrence);
 403    --  Copy all the components of Source to Target, except the
 404    --  Private_Data pointer.
 405
 406    procedure Transfer_Occurrence
 407      (Target : Exception_Occurrence_Access;
 408       Source : Exception_Occurrence);
 409    pragma Export (C, Transfer_Occurrence, "__gnat_transfer_occurrence");
 410    --  Called from System.Tasking.RendezVous.Exceptional_Complete_RendezVous
 411    --  to setup Target from Source as an exception to be propagated in the
 412    --  caller task. Target is expected to be a pointer to the fixed TSD
 413    --  occurrence for this task.
 414
 415    -----------------------------
 416    -- Run-Time Check Routines --
 417    -----------------------------
 418
 419    --  These routines are called from the runtime to raise a specific
 420    --  exception with a reason message attached. The parameters are
 421    --  the file name and line number in each case. The names are keyed
 422    --  to the codes defined in Types.ads and a-types.h (for example,
 423    --  the name Rcheck_05 refers to the Reason whose Pos code is 5).
 424
 425    procedure Rcheck_00 (File : System.Address; Line : Integer);
 426    procedure Rcheck_01 (File : System.Address; Line : Integer);
 427    procedure Rcheck_02 (File : System.Address; Line : Integer);
 428    procedure Rcheck_03 (File : System.Address; Line : Integer);
 429    procedure Rcheck_04 (File : System.Address; Line : Integer);
 430    procedure Rcheck_05 (File : System.Address; Line : Integer);
 431    procedure Rcheck_06 (File : System.Address; Line : Integer);
 432    procedure Rcheck_07 (File : System.Address; Line : Integer);
 433    procedure Rcheck_08 (File : System.Address; Line : Integer);
 434    procedure Rcheck_09 (File : System.Address; Line : Integer);
 435    procedure Rcheck_10 (File : System.Address; Line : Integer);
 436    procedure Rcheck_11 (File : System.Address; Line : Integer);
 437    procedure Rcheck_12 (File : System.Address; Line : Integer);
 438    procedure Rcheck_13 (File : System.Address; Line : Integer);
 439    procedure Rcheck_14 (File : System.Address; Line : Integer);
 440    procedure Rcheck_15 (File : System.Address; Line : Integer);
 441    procedure Rcheck_16 (File : System.Address; Line : Integer);
 442    procedure Rcheck_17 (File : System.Address; Line : Integer);
 443    procedure Rcheck_18 (File : System.Address; Line : Integer);
 444    procedure Rcheck_19 (File : System.Address; Line : Integer);
 445    procedure Rcheck_20 (File : System.Address; Line : Integer);
 446    procedure Rcheck_21 (File : System.Address; Line : Integer);
 447    procedure Rcheck_22 (File : System.Address; Line : Integer);
 448    procedure Rcheck_23 (File : System.Address; Line : Integer);
 449    procedure Rcheck_24 (File : System.Address; Line : Integer);
 450    procedure Rcheck_25 (File : System.Address; Line : Integer);
 451    procedure Rcheck_26 (File : System.Address; Line : Integer);
 452    procedure Rcheck_27 (File : System.Address; Line : Integer);
 453    procedure Rcheck_28 (File : System.Address; Line : Integer);
 454    procedure Rcheck_29 (File : System.Address; Line : Integer);
 455    procedure Rcheck_30 (File : System.Address; Line : Integer);
 456
 457    pragma Export (C, Rcheck_00, "__gnat_rcheck_00");
 458    pragma Export (C, Rcheck_01, "__gnat_rcheck_01");
 459    pragma Export (C, Rcheck_02, "__gnat_rcheck_02");
 460    pragma Export (C, Rcheck_03, "__gnat_rcheck_03");
 461    pragma Export (C, Rcheck_04, "__gnat_rcheck_04");
 462    pragma Export (C, Rcheck_05, "__gnat_rcheck_05");
 463    pragma Export (C, Rcheck_06, "__gnat_rcheck_06");
 464    pragma Export (C, Rcheck_07, "__gnat_rcheck_07");
 465    pragma Export (C, Rcheck_08, "__gnat_rcheck_08");
 466    pragma Export (C, Rcheck_09, "__gnat_rcheck_09");
 467    pragma Export (C, Rcheck_10, "__gnat_rcheck_10");
 468    pragma Export (C, Rcheck_11, "__gnat_rcheck_11");
 469    pragma Export (C, Rcheck_12, "__gnat_rcheck_12");
 470    pragma Export (C, Rcheck_13, "__gnat_rcheck_13");
 471    pragma Export (C, Rcheck_14, "__gnat_rcheck_14");
 472    pragma Export (C, Rcheck_15, "__gnat_rcheck_15");
 473    pragma Export (C, Rcheck_16, "__gnat_rcheck_16");
 474    pragma Export (C, Rcheck_17, "__gnat_rcheck_17");
 475    pragma Export (C, Rcheck_18, "__gnat_rcheck_18");
 476    pragma Export (C, Rcheck_19, "__gnat_rcheck_19");
 477    pragma Export (C, Rcheck_20, "__gnat_rcheck_20");
 478    pragma Export (C, Rcheck_21, "__gnat_rcheck_21");
 479    pragma Export (C, Rcheck_22, "__gnat_rcheck_22");
 480    pragma Export (C, Rcheck_23, "__gnat_rcheck_23");
 481    pragma Export (C, Rcheck_24, "__gnat_rcheck_24");
 482    pragma Export (C, Rcheck_25, "__gnat_rcheck_25");
 483    pragma Export (C, Rcheck_26, "__gnat_rcheck_26");
 484    pragma Export (C, Rcheck_27, "__gnat_rcheck_27");
 485    pragma Export (C, Rcheck_28, "__gnat_rcheck_28");
 486    pragma Export (C, Rcheck_29, "__gnat_rcheck_29");
 487    pragma Export (C, Rcheck_30, "__gnat_rcheck_30");
 488
 489    --  None of these procedures ever returns (they raise an exception!). By
 490    --  using pragma No_Return, we ensure that any junk code after the call,
 491    --  such as normal return epilog stuff, can be eliminated).
 492
 493    pragma No_Return (Rcheck_00);
 494    pragma No_Return (Rcheck_01);
 495    pragma No_Return (Rcheck_02);
 496    pragma No_Return (Rcheck_03);
 497    pragma No_Return (Rcheck_04);
 498    pragma No_Return (Rcheck_05);
 499    pragma No_Return (Rcheck_06);
 500    pragma No_Return (Rcheck_07);
 501    pragma No_Return (Rcheck_08);
 502    pragma No_Return (Rcheck_09);
 503    pragma No_Return (Rcheck_10);
 504    pragma No_Return (Rcheck_11);
 505    pragma No_Return (Rcheck_12);
 506    pragma No_Return (Rcheck_13);
 507    pragma No_Return (Rcheck_14);
 508    pragma No_Return (Rcheck_15);
 509    pragma No_Return (Rcheck_16);
 510    pragma No_Return (Rcheck_17);
 511    pragma No_Return (Rcheck_18);
 512    pragma No_Return (Rcheck_19);
 513    pragma No_Return (Rcheck_20);
 514    pragma No_Return (Rcheck_21);
 515    pragma No_Return (Rcheck_22);
 516    pragma No_Return (Rcheck_23);
 517    pragma No_Return (Rcheck_24);
 518    pragma No_Return (Rcheck_25);
 519    pragma No_Return (Rcheck_26);
 520    pragma No_Return (Rcheck_27);
 521    pragma No_Return (Rcheck_28);
 522    pragma No_Return (Rcheck_29);
 523    pragma No_Return (Rcheck_30);
 524
 525    ---------------------------------------------
 526    -- Reason Strings for Run-Time Check Calls --
 527    ---------------------------------------------
 528
 529    --  These strings are null-terminated and are used by Rcheck_nn. The
 530    --  strings correspond to the definitions for Types.RT_Exception_Code.
 531
 532    use ASCII;
 533
 534    Rmsg_00 : constant String := "access check failed"              & NUL;
 535    Rmsg_01 : constant String := "access parameter is null"         & NUL;
 536    Rmsg_02 : constant String := "discriminant check failed"        & NUL;
 537    Rmsg_03 : constant String := "divide by zero"                   & NUL;
 538    Rmsg_04 : constant String := "explicit raise"                   & NUL;
 539    Rmsg_05 : constant String := "index check failed"               & NUL;
 540    Rmsg_06 : constant String := "invalid data"                     & NUL;
 541    Rmsg_07 : constant String := "length check failed"              & NUL;
 542    Rmsg_08 : constant String := "null-exclusion check failed"      & NUL;
 543    Rmsg_09 : constant String := "overflow check failed"            & NUL;
 544    Rmsg_10 : constant String := "partition check failed"           & NUL;
 545    Rmsg_11 : constant String := "range check failed"               & NUL;
 546    Rmsg_12 : constant String := "tag check failed"                 & NUL;
 547    Rmsg_13 : constant String := "access before elaboration"        & NUL;
 548    Rmsg_14 : constant String := "accessibility check failed"       & NUL;
 549    Rmsg_15 : constant String := "all guards closed"                & NUL;
 550    Rmsg_16 : constant String := "duplicated entry address"         & NUL;
 551    Rmsg_17 : constant String := "explicit raise"                   & NUL;
 552    Rmsg_18 : constant String := "finalize/adjust raised exception" & NUL;
 553    Rmsg_19 : constant String := "misaligned address value"         & NUL;
 554    Rmsg_20 : constant String := "missing return"                   & NUL;
 555    Rmsg_21 : constant String := "overlaid controlled object"       & NUL;
 556    Rmsg_22 : constant String := "potentially blocking operation"   & NUL;
 557    Rmsg_23 : constant String := "stubbed subprogram called"        & NUL;
 558    Rmsg_24 : constant String := "unchecked union restriction"      & NUL;
 559    Rmsg_25 : constant String := "illegal use of"
 560              & " remote access-to-class-wide type, see RM E.4(18)" & NUL;
 561    Rmsg_26 : constant String := "empty storage pool"               & NUL;
 562    Rmsg_27 : constant String := "explicit raise"                   & NUL;
 563    Rmsg_28 : constant String := "infinite recursion"               & NUL;
 564    Rmsg_29 : constant String := "object too large"                 & NUL;
 565    Rmsg_30 : constant String := "restriction violation"            & NUL;
 566
 567    -----------------------
 568    -- Polling Interface --
 569    -----------------------
 570
 571    type Unsigned is mod 2 ** 32;
 572
 573    Counter : Unsigned := 0;
 574    pragma Warnings (Off, Counter);
 575    --  This counter is provided for convenience. It can be used in Poll to
 576    --  perform periodic but not systematic operations.
 577
 578    procedure Poll is separate;
 579    --  The actual polling routine is separate, so that it can easily
 580    --  be replaced with a target dependent version.
 581
 582    --------------------------
 583    -- Code_Address_For_AAA --
 584    --------------------------
 585
 586    --  This function gives us the start of the PC range for addresses
 587    --  within the exception unit itself. We hope that gigi/gcc keep all the
 588    --  procedures in their original order!
 589
 590    function Code_Address_For_AAA return System.Address is
 591    begin
 592       --  We are using a label instead of merely using
 593       --  Code_Address_For_AAA'Address because on some platforms the latter
 594       --  does not yield the address we want, but the address of a stub or of
 595       --  a descriptor instead. This is the case at least on Alpha-VMS and
 596       --  PA-HPUX.
 597
 598       <<Start_Of_AAA>>
 599       return Start_Of_AAA'Address;
 600    end Code_Address_For_AAA;
 601
 602    ----------------
 603    -- Call_Chain --
 604    ----------------
 605
 606    procedure Call_Chain (Excep : EOA) is separate;
 607    --  The actual Call_Chain routine is separate, so that it can easily
 608    --  be dummied out when no exception traceback information is needed.
 609
 610    ------------------------------
 611    -- Current_Target_Exception --
 612    ------------------------------
 613
 614    function Current_Target_Exception return Exception_Occurrence is
 615    begin
 616       return Null_Occurrence;
 617    end Current_Target_Exception;
 618
 619    -------------------
 620    -- EId_To_String --
 621    -------------------
 622
 623    function EId_To_String (X : Exception_Id) return String
 624      renames Stream_Attributes.EId_To_String;
 625
 626    ------------------
 627    -- EO_To_String --
 628    ------------------
 629
 630    --  We use the null string to represent the null occurrence, otherwise
 631    --  we output the Exception_Information string for the occurrence.
 632
 633    function EO_To_String (X : Exception_Occurrence) return String
 634      renames Stream_Attributes.EO_To_String;
 635
 636    ------------------------
 637    -- Exception_Identity --
 638    ------------------------
 639
 640    function Exception_Identity
 641      (X : Exception_Occurrence) return Exception_Id
 642    is
 643    begin
 644       --  Note that the following test used to be here for the original
 645       --  Ada 95 semantics, but these were modified by AI-241 to require
 646       --  returning Null_Id instead of raising Constraint_Error.
 647
 648       --  if X.Id = Null_Id then
 649       --     raise Constraint_Error;
 650       --  end if;
 651
 652       return X.Id;
 653    end Exception_Identity;
 654
 655    ---------------------------
 656    -- Exception_Information --
 657    ---------------------------
 658
 659    function Exception_Information (X : Exception_Occurrence) return String is
 660    begin
 661       if X.Id = Null_Id then
 662          raise Constraint_Error;
 663       end if;
 664
 665       return Exception_Data.Exception_Information (X);
 666    end Exception_Information;
 667
 668    -----------------------
 669    -- Exception_Message --
 670    -----------------------
 671
 672    function Exception_Message (X : Exception_Occurrence) return String is
 673    begin
 674       if X.Id = Null_Id then
 675          raise Constraint_Error;
 676       end if;
 677
 678       return X.Msg (1 .. X.Msg_Length);
 679    end Exception_Message;
 680
 681    --------------------
 682    -- Exception_Name --
 683    --------------------
 684
 685    function Exception_Name (Id : Exception_Id) return String is
 686    begin
 687       if Id = null then
 688          raise Constraint_Error;
 689       end if;
 690
 691       return To_Ptr (Id.Full_Name) (1 .. Id.Name_Length - 1);
 692    end Exception_Name;
 693
 694    function Exception_Name (X : Exception_Occurrence) return String is
 695    begin
 696       return Exception_Name (X.Id);
 697    end Exception_Name;
 698
 699    ---------------------------
 700    -- Exception_Name_Simple --
 701    ---------------------------
 702
 703    function Exception_Name_Simple (X : Exception_Occurrence) return String is
 704       Name : constant String := Exception_Name (X);
 705       P    : Natural;
 706
 707    begin
 708       P := Name'Length;
 709       while P > 1 loop
 710          exit when Name (P - 1) = '.';
 711          P := P - 1;
 712       end loop;
 713
 714       --  Return result making sure lower bound is 1
 715
 716       declare
 717          subtype Rname is String (1 .. Name'Length - P + 1);
 718       begin
 719          return Rname (Name (P .. Name'Length));
 720       end;
 721    end Exception_Name_Simple;
 722
 723    --------------------
 724    -- Exception_Data --
 725    --------------------
 726
 727    package body Exception_Data is separate;
 728    --  This package can be easily dummied out if we do not want the
 729    --  basic support for exception messages (such as in Ada 83).
 730
 731    ---------------------------
 732    -- Exception_Propagation --
 733    ---------------------------
 734
 735    package body Exception_Propagation is separate;
 736    --  Depending on the actual exception mechanism used (front-end or
 737    --  back-end based), the implementation will differ, which is why this
 738    --  package is separated.
 739
 740    ----------------------
 741    -- Exception_Traces --
 742    ----------------------
 743
 744    package body Exception_Traces is separate;
 745    --  Depending on the underlying support for IO the implementation
 746    --  will differ. Moreover we would like to dummy out this package
 747    --  in case we do not want any exception tracing support. This is
 748    --  why this package is separated.
 749
 750    -----------------------
 751    -- Stream Attributes --
 752    -----------------------
 753
 754    package body Stream_Attributes is separate;
 755    --  This package can be easily dummied out if we do not want the
 756    --  support for streaming Exception_Ids and Exception_Occurrences.
 757
 758    -----------------------------
 759    -- Process_Raise_Exception --
 760    -----------------------------
 761
 762    procedure Process_Raise_Exception
 763      (E                   : Exception_Id;
 764       From_Signal_Handler : Boolean)
 765    is
 766       pragma Inspection_Point (E);
 767       --  This is so the debugger can reliably inspect the parameter
 768    begin
 769       --  WARNING: There should be no exception handler for this body
 770       --  because this would cause gigi to prepend a setup for a new
 771       --  jmpbuf to the sequence of statements in case of built-in sjljl.
 772       --  We would then always get this new buf in Jumpbuf_Ptr instead of the
 773       --  one for the exception we are handling, which would completely break
 774       --  the whole design of this procedure.
 775
 776       Exception_Propagation.Propagate_Exception (From_Signal_Handler);
 777    end Process_Raise_Exception;
 778
 779    ----------------------------
 780    -- Raise_Constraint_Error --
 781    ----------------------------
 782
 783    procedure Raise_Constraint_Error
 784      (File : System.Address;
 785       Line : Integer)
 786    is
 787    begin
 788       Raise_With_Location_And_Msg
 789         (Constraint_Error_Def'Access, File, Line);
 790    end Raise_Constraint_Error;
 791
 792    --------------------------------
 793    -- Raise_Constraint_Error_Msg --
 794    --------------------------------
 795
 796    procedure Raise_Constraint_Error_Msg
 797      (File : System.Address;
 798       Line : Integer;
 799       Msg  : System.Address)
 800    is
 801    begin
 802       Raise_With_Location_And_Msg
 803         (Constraint_Error_Def'Access, File, Line, Msg);
 804    end Raise_Constraint_Error_Msg;
 805
 806    -------------------------
 807    -- Raise_Current_Excep --
 808    -------------------------
 809
 810    procedure Raise_Current_Excep (E : Exception_Id) is
 811
 812       pragma Inspection_Point (E);
 813       --  This is so the debugger can reliably inspect the parameter when
 814       --  inserting a breakpoint at the start of this procedure.
 815
 816       Id : Exception_Id := E;
 817       pragma Volatile (Id);
 818       pragma Warnings (Off, Id);
 819       --  In order to provide support for breakpoints on unhandled exceptions,
 820       --  the debugger will also need to be able to inspect the value of E from
 821       --  another (inner) frame. So we need to make sure that if E is passed in
 822       --  a register, its value is also spilled on stack. For this, we store
 823       --  the parameter value in a local variable, and add a pragma Volatile to
 824       --  make sure it is spilled. The pragma Warnings (Off) is needed because
 825       --  the compiler knows that Id is not referenced and that this use of
 826       --  pragma Volatile is peculiar!
 827
 828    begin
 829       Process_Raise_Exception (E => E, From_Signal_Handler => False);
 830    end Raise_Current_Excep;
 831
 832    ---------------------
 833    -- Raise_Exception --
 834    ---------------------
 835
 836    procedure Raise_Exception
 837      (E       : Exception_Id;
 838       Message : String := "")
 839    is
 840    begin
 841       if E /= null then
 842          Exception_Data.Set_Exception_Msg (E, Message);
 843          Abort_Defer.all;
 844          Raise_Current_Excep (E);
 845       end if;
 846    end Raise_Exception;
 847
 848    ----------------------------
 849    -- Raise_Exception_Always --
 850    ----------------------------
 851
 852    procedure Raise_Exception_Always
 853      (E       : Exception_Id;
 854       Message : String := "")
 855    is
 856    begin
 857       Exception_Data.Set_Exception_Msg (E, Message);
 858       Abort_Defer.all;
 859       Raise_Current_Excep (E);
 860    end Raise_Exception_Always;
 861
 862    -------------------------------
 863    -- Raise_From_Signal_Handler --
 864    -------------------------------
 865
 866    procedure Raise_From_Signal_Handler
 867      (E : Exception_Id;
 868       M : System.Address)
 869    is
 870    begin
 871       Exception_Data.Set_Exception_C_Msg (E, M);
 872       Abort_Defer.all;
 873       Process_Raise_Exception (E => E, From_Signal_Handler => True);
 874    end Raise_From_Signal_Handler;
 875
 876    -------------------------
 877    -- Raise_Program_Error --
 878    -------------------------
 879
 880    procedure Raise_Program_Error
 881      (File : System.Address;
 882       Line : Integer)
 883    is
 884    begin
 885       Raise_With_Location_And_Msg
 886         (Program_Error_Def'Access, File, Line);
 887    end Raise_Program_Error;
 888
 889    -----------------------------
 890    -- Raise_Program_Error_Msg --
 891    -----------------------------
 892
 893    procedure Raise_Program_Error_Msg
 894      (File : System.Address;
 895       Line : Integer;
 896       Msg  : System.Address)
 897    is
 898    begin
 899       Raise_With_Location_And_Msg
 900         (Program_Error_Def'Access, File, Line, Msg);
 901    end Raise_Program_Error_Msg;
 902
 903    -------------------------
 904    -- Raise_Storage_Error --
 905    -------------------------
 906
 907    procedure Raise_Storage_Error
 908      (File : System.Address;
 909       Line : Integer)
 910    is
 911    begin
 912       Raise_With_Location_And_Msg
 913         (Storage_Error_Def'Access, File, Line);
 914    end Raise_Storage_Error;
 915
 916    -----------------------------
 917    -- Raise_Storage_Error_Msg --
 918    -----------------------------
 919
 920    procedure Raise_Storage_Error_Msg
 921      (File : System.Address;
 922       Line : Integer;
 923       Msg  : System.Address)
 924    is
 925    begin
 926       Raise_With_Location_And_Msg
 927         (Storage_Error_Def'Access, File, Line, Msg);
 928    end Raise_Storage_Error_Msg;
 929
 930    ---------------------------------
 931    -- Raise_With_Location_And_Msg --
 932    ---------------------------------
 933
 934    procedure Raise_With_Location_And_Msg
 935      (E : Exception_Id;
 936       F : System.Address;
 937       L : Integer;
 938       M : System.Address := System.Null_Address)
 939    is
 940    begin
 941       Exception_Data.Set_Exception_C_Msg (E, F, L, M);
 942       Abort_Defer.all;
 943       Raise_Current_Excep (E);
 944    end Raise_With_Location_And_Msg;
 945
 946    --------------------
 947    -- Raise_With_Msg --
 948    --------------------
 949
 950    procedure Raise_With_Msg (E : Exception_Id) is
 951       Excep : constant EOA := Get_Current_Excep.all;
 952
 953    begin
 954       Exception_Propagation.Setup_Exception (Excep, Excep);
 955
 956       Excep.Exception_Raised := False;
 957       Excep.Id               := E;
 958       Excep.Num_Tracebacks   := 0;
 959       Excep.Cleanup_Flag     := False;
 960       Excep.Pid              := Local_Partition_ID;
 961       Abort_Defer.all;
 962       Raise_Current_Excep (E);
 963    end Raise_With_Msg;
 964
 965    --------------------------------------
 966    -- Calls to Run-Time Check Routines --
 967    --------------------------------------
 968
 969    procedure Rcheck_00 (File : System.Address; Line : Integer) is
 970    begin
 971       Raise_Constraint_Error_Msg (File, Line, Rmsg_00'Address);
 972    end Rcheck_00;
 973
 974    procedure Rcheck_01 (File : System.Address; Line : Integer) is
 975    begin
 976       Raise_Constraint_Error_Msg (File, Line, Rmsg_01'Address);
 977    end Rcheck_01;
 978
 979    procedure Rcheck_02 (File : System.Address; Line : Integer) is
 980    begin
 981       Raise_Constraint_Error_Msg (File, Line, Rmsg_02'Address);
 982    end Rcheck_02;
 983
 984    procedure Rcheck_03 (File : System.Address; Line : Integer) is
 985    begin
 986       Raise_Constraint_Error_Msg (File, Line, Rmsg_03'Address);
 987    end Rcheck_03;
 988
 989    procedure Rcheck_04 (File : System.Address; Line : Integer) is
 990    begin
 991       Raise_Constraint_Error_Msg (File, Line, Rmsg_04'Address);
 992    end Rcheck_04;
 993
 994    procedure Rcheck_05 (File : System.Address; Line : Integer) is
 995    begin
 996       Raise_Constraint_Error_Msg (File, Line, Rmsg_05'Address);
 997    end Rcheck_05;
 998
 999    procedure Rcheck_06 (File : System.Address; Line : Integer) is
1000    begin
1001       Raise_Constraint_Error_Msg (File, Line, Rmsg_06'Address);
1002    end Rcheck_06;
1003
1004    procedure Rcheck_07 (File : System.Address; Line : Integer) is
1005    begin
1006       Raise_Constraint_Error_Msg (File, Line, Rmsg_07'Address);
1007    end Rcheck_07;
1008
1009    procedure Rcheck_08 (File : System.Address; Line : Integer) is
1010    begin
1011       Raise_Constraint_Error_Msg (File, Line, Rmsg_08'Address);
1012    end Rcheck_08;
1013
1014    procedure Rcheck_09 (File : System.Address; Line : Integer) is
1015    begin
1016       Raise_Constraint_Error_Msg (File, Line, Rmsg_09'Address);
1017    end Rcheck_09;
1018
1019    procedure Rcheck_10 (File : System.Address; Line : Integer) is
1020    begin
1021       Raise_Constraint_Error_Msg (File, Line, Rmsg_10'Address);
1022    end Rcheck_10;
1023
1024    procedure Rcheck_11 (File : System.Address; Line : Integer) is
1025    begin
1026       Raise_Constraint_Error_Msg (File, Line, Rmsg_11'Address);
1027    end Rcheck_11;
1028
1029    procedure Rcheck_12 (File : System.Address; Line : Integer) is
1030    begin
1031       Raise_Constraint_Error_Msg (File, Line, Rmsg_12'Address);
1032    end Rcheck_12;
1033
1034    procedure Rcheck_13 (File : System.Address; Line : Integer) is
1035    begin
1036       Raise_Program_Error_Msg (File, Line, Rmsg_13'Address);
1037    end Rcheck_13;
1038
1039    procedure Rcheck_14 (File : System.Address; Line : Integer) is
1040    begin
1041       Raise_Program_Error_Msg (File, Line, Rmsg_14'Address);
1042    end Rcheck_14;
1043
1044    procedure Rcheck_15 (File : System.Address; Line : Integer) is
1045    begin
1046       Raise_Program_Error_Msg (File, Line, Rmsg_15'Address);
1047    end Rcheck_15;
1048
1049    procedure Rcheck_16 (File : System.Address; Line : Integer) is
1050    begin
1051       Raise_Program_Error_Msg (File, Line, Rmsg_16'Address);
1052    end Rcheck_16;
1053
1054    procedure Rcheck_17 (File : System.Address; Line : Integer) is
1055    begin
1056       Raise_Program_Error_Msg (File, Line, Rmsg_17'Address);
1057    end Rcheck_17;
1058
1059    procedure Rcheck_18 (File : System.Address; Line : Integer) is
1060    begin
1061       Raise_Program_Error_Msg (File, Line, Rmsg_18'Address);
1062    end Rcheck_18;
1063
1064    procedure Rcheck_19 (File : System.Address; Line : Integer) is
1065    begin
1066       Raise_Program_Error_Msg (File, Line, Rmsg_19'Address);
1067    end Rcheck_19;
1068
1069    procedure Rcheck_20 (File : System.Address; Line : Integer) is
1070    begin
1071       Raise_Program_Error_Msg (File, Line, Rmsg_20'Address);
1072    end Rcheck_20;
1073
1074    procedure Rcheck_21 (File : System.Address; Line : Integer) is
1075    begin
1076       Raise_Program_Error_Msg (File, Line, Rmsg_21'Address);
1077    end Rcheck_21;
1078
1079    procedure Rcheck_22 (File : System.Address; Line : Integer) is
1080    begin
1081       Raise_Program_Error_Msg (File, Line, Rmsg_22'Address);
1082    end Rcheck_22;
1083
1084    procedure Rcheck_23 (File : System.Address; Line : Integer) is
1085    begin
1086       Raise_Program_Error_Msg (File, Line, Rmsg_23'Address);
1087    end Rcheck_23;
1088
1089    procedure Rcheck_24 (File : System.Address; Line : Integer) is
1090    begin
1091       Raise_Program_Error_Msg (File, Line, Rmsg_24'Address);
1092    end Rcheck_24;
1093
1094    procedure Rcheck_25 (File : System.Address; Line : Integer) is
1095    begin
1096       Raise_Program_Error_Msg (File, Line, Rmsg_25'Address);
1097    end Rcheck_25;
1098
1099    procedure Rcheck_26 (File : System.Address; Line : Integer) is
1100    begin
1101       Raise_Storage_Error_Msg (File, Line, Rmsg_26'Address);
1102    end Rcheck_26;
1103
1104    procedure Rcheck_27 (File : System.Address; Line : Integer) is
1105    begin
1106       Raise_Storage_Error_Msg (File, Line, Rmsg_27'Address);
1107    end Rcheck_27;
1108
1109    procedure Rcheck_28 (File : System.Address; Line : Integer) is
1110    begin
1111       Raise_Storage_Error_Msg (File, Line, Rmsg_28'Address);
1112    end Rcheck_28;
1113
1114    procedure Rcheck_29 (File : System.Address; Line : Integer) is
1115    begin
1116       Raise_Storage_Error_Msg (File, Line, Rmsg_29'Address);
1117    end Rcheck_29;
1118
1119    procedure Rcheck_30 (File : System.Address; Line : Integer) is
1120    begin
1121       Raise_Storage_Error_Msg (File, Line, Rmsg_30'Address);
1122    end Rcheck_30;
1123
1124    -------------
1125    -- Reraise --
1126    -------------
1127
1128    procedure Reraise is
1129       Excep : constant EOA := Get_Current_Excep.all;
1130
1131    begin
1132       Abort_Defer.all;
1133       Exception_Propagation.Setup_Exception (Excep, Excep, Reraised => True);
1134       Raise_Current_Excep (Excep.Id);
1135    end Reraise;
1136
1137    ------------------------
1138    -- Reraise_Occurrence --
1139    ------------------------
1140
1141    procedure Reraise_Occurrence (X : Exception_Occurrence) is
1142    begin
1143       if X.Id /= null then
1144          Abort_Defer.all;
1145          Exception_Propagation.Setup_Exception
1146            (X'Unrestricted_Access, Get_Current_Excep.all, Reraised => True);
1147          Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1148          Raise_Current_Excep (X.Id);
1149       end if;
1150    end Reraise_Occurrence;
1151
1152    -------------------------------
1153    -- Reraise_Occurrence_Always --
1154    -------------------------------
1155
1156    procedure Reraise_Occurrence_Always (X : Exception_Occurrence) is
1157    begin
1158       Abort_Defer.all;
1159       Exception_Propagation.Setup_Exception
1160         (X'Unrestricted_Access, Get_Current_Excep.all, Reraised => True);
1161       Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1162       Raise_Current_Excep (X.Id);
1163    end Reraise_Occurrence_Always;
1164
1165    ---------------------------------
1166    -- Reraise_Occurrence_No_Defer --
1167    ---------------------------------
1168
1169    procedure Reraise_Occurrence_No_Defer (X : Exception_Occurrence) is
1170    begin
1171       Exception_Propagation.Setup_Exception
1172         (X'Unrestricted_Access, Get_Current_Excep.all, Reraised => True);
1173       Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1174       Raise_Current_Excep (X.Id);
1175    end Reraise_Occurrence_No_Defer;
1176
1177    ---------------------
1178    -- Save_Occurrence --
1179    ---------------------
1180
1181    procedure Save_Occurrence
1182      (Target : out Exception_Occurrence;
1183       Source : Exception_Occurrence)
1184    is
1185    begin
1186       Save_Occurrence_No_Private (Target, Source);
1187    end Save_Occurrence;
1188
1189    function Save_Occurrence (Source : Exception_Occurrence) return EOA is
1190       Target : constant EOA := new Exception_Occurrence;
1191    begin
1192       Save_Occurrence (Target.all, Source);
1193       return Target;
1194    end Save_Occurrence;
1195
1196    --------------------------------
1197    -- Save_Occurrence_No_Private --
1198    --------------------------------
1199
1200    procedure Save_Occurrence_No_Private
1201      (Target : out Exception_Occurrence;
1202       Source : Exception_Occurrence)
1203    is
1204    begin
1205       Target.Id             := Source.Id;
1206       Target.Msg_Length     := Source.Msg_Length;
1207       Target.Num_Tracebacks := Source.Num_Tracebacks;
1208       Target.Pid            := Source.Pid;
1209       Target.Cleanup_Flag   := Source.Cleanup_Flag;
1210
1211       Target.Msg (1 .. Target.Msg_Length) :=
1212         Source.Msg (1 .. Target.Msg_Length);
1213
1214       Target.Tracebacks (1 .. Target.Num_Tracebacks) :=
1215         Source.Tracebacks (1 .. Target.Num_Tracebacks);
1216    end Save_Occurrence_No_Private;
1217
1218    -------------------------
1219    -- Transfer_Occurrence --
1220    -------------------------
1221
1222    procedure Transfer_Occurrence
1223      (Target : Exception_Occurrence_Access;
1224       Source : Exception_Occurrence)
1225    is
1226    begin
1227       --  Setup Target as an exception to be propagated in the calling task
1228       --  (rendezvous-wise), taking care not to clobber the associated private
1229       --  data.  Target is expected to be a pointer to the calling task's
1230       --  fixed TSD occurrence, which is very different from Get_Current_Excep
1231       --  here because this subprogram is called from the called task.
1232
1233       Exception_Propagation.Setup_Exception (Target, Target);
1234       Save_Occurrence_No_Private (Target.all, Source);
1235    end Transfer_Occurrence;
1236
1237    -------------------
1238    -- String_To_EId --
1239    -------------------
1240
1241    function String_To_EId (S : String) return Exception_Id
1242      renames Stream_Attributes.String_To_EId;
1243
1244    ------------------
1245    -- String_To_EO --
1246    ------------------
1247
1248    function String_To_EO (S : String) return Exception_Occurrence
1249      renames Stream_Attributes.String_To_EO;
1250
1251    ------------------------------
1252    -- Raise_Exception_No_Defer --
1253    ------------------------------
1254
1255    procedure Raise_Exception_No_Defer
1256      (E       : Exception_Id;
1257       Message : String := "")
1258    is
1259    begin
1260       Exception_Data.Set_Exception_Msg (E, Message);
1261
1262       --  Do not call Abort_Defer.all, as specified by the spec
1263
1264       Raise_Current_Excep (E);
1265    end Raise_Exception_No_Defer;
1266
1267    ---------------
1268    -- To_Stderr --
1269    ---------------
1270
1271    procedure To_Stderr (C : Character) is
1272
1273       type int is new Integer;
1274
1275       procedure put_char_stderr (C : int);
1276       pragma Import (C, put_char_stderr, "put_char_stderr");
1277
1278    begin
1279       put_char_stderr (Character'Pos (C));
1280    end To_Stderr;
1281
1282    procedure To_Stderr (S : String) is
1283    begin
1284       for J in S'Range loop
1285          if S (J) /= ASCII.CR then
1286             To_Stderr (S (J));
1287          end if;
1288       end loop;
1289    end To_Stderr;
1290
1291    --------------------------
1292    -- Code_Address_For_ZZZ --
1293    --------------------------
1294
1295    --  This function gives us the end of the PC range for addresses
1296    --  within the exception unit itself. We hope that gigi/gcc keeps all the
1297    --  procedures in their original order!
1298
1299    function Code_Address_For_ZZZ return System.Address is
1300    begin
1301       <<Start_Of_ZZZ>>
1302       return Start_Of_ZZZ'Address;
1303    end Code_Address_For_ZZZ;
1304
1305 end Ada.Exceptions;