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) 1992-2010, 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 3,  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.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  This version of Ada.Exceptions fully supports both Ada 95 and Ada 2005.
  33 --  It is used in all situations except for the build of the compiler and
  34 --  other basic tools. For these latter builds, we use an Ada 95-only version.
  35
  36 --  The reason for this splitting off of a separate version is that bootstrap
  37 --  compilers often will be used that do not support Ada 2005 features, and
  38 --  Ada.Exceptions is part of the compiler sources.
  39
  40 pragma Style_Checks (All_Checks);
  41 --  No subprogram ordering check, due to logical grouping
  42
  43 pragma Polling (Off);
  44 --  We must turn polling off for this unit, because otherwise we get
  45 --  elaboration circularities with System.Exception_Tables.
  46
  47 with System;                  use System;
  48 with System.Exceptions;       use System.Exceptions;
  49 with System.Standard_Library; use System.Standard_Library;
  50 with System.Soft_Links;       use System.Soft_Links;
  51 with System.WCh_Con;          use System.WCh_Con;
  52 with System.WCh_StW;          use System.WCh_StW;
  53
  54 package body Ada.Exceptions is
  55
  56    pragma Suppress (All_Checks);
  57    --  We definitely do not want exceptions occurring within this unit, or
  58    --  we are in big trouble. If an exceptional situation does occur, better
  59    --  that it not be raised, since raising it can cause confusing chaos.
  60
  61    -----------------------
  62    -- Local Subprograms --
  63    -----------------------
  64
  65    --  Note: the exported subprograms in this package body are called directly
  66    --  from C clients using the given external name, even though they are not
  67    --  technically visible in the Ada sense.
  68
  69    function Code_Address_For_AAA return System.Address;
  70    function Code_Address_For_ZZZ return System.Address;
  71    --  Return start and end of procedures in this package
  72    --
  73    --  These procedures are used to provide exclusion bounds in
  74    --  calls to Call_Chain at exception raise points from this unit. The
  75    --  purpose is to arrange for the exception tracebacks not to include
  76    --  frames from routines involved in the raise process, as these are
  77    --  meaningless from the user's standpoint.
  78    --
  79    --  For these bounds to be meaningful, we need to ensure that the object
  80    --  code for the routines involved in processing a raise is located after
  81    --  the object code Code_Address_For_AAA and before the object code
  82    --  Code_Address_For_ZZZ. This will indeed be the case as long as the
  83    --  following rules are respected:
  84    --
  85    --  1) The bodies of the subprograms involved in processing a raise
  86    --     are located after the body of Code_Address_For_AAA and before the
  87    --     body of Code_Address_For_ZZZ.
  88    --
  89    --  2) No pragma Inline applies to any of these subprograms, as this
  90    --     could delay the corresponding assembly output until the end of
  91    --     the unit.
  92
  93    procedure Call_Chain (Excep : EOA);
  94    --  Store up to Max_Tracebacks in Excep, corresponding to the current
  95    --  call chain.
  96
  97    function Image (Index : Integer) return String;
  98    --  Return string image corresponding to Index
  99
 100    procedure To_Stderr (S : String);
 101    pragma Export (Ada, To_Stderr, "__gnat_to_stderr");
 102    --  Little routine to output string to stderr that is also used
 103    --  in the tasking run time.
 104
 105    procedure To_Stderr (C : Character);
 106    pragma Inline (To_Stderr);
 107    pragma Export (Ada, To_Stderr, "__gnat_to_stderr_char");
 108    --  Little routine to output a character to stderr, used by some of
 109    --  the separate units below.
 110
 111    package Exception_Data is
 112
 113       ---------------------------------
 114       -- Exception messages routines --
 115       ---------------------------------
 116
 117       procedure Set_Exception_C_Msg
 118         (Id     : Exception_Id;
 119          Msg1   : System.Address;
 120          Line   : Integer        := 0;
 121          Column : 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. Ditto for Column. When Msg2 is non-null, a space and this
 129       --  additional null 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       C : Integer := 0;
 315       M : System.Address := System.Null_Address);
 316    pragma No_Return (Raise_With_Location_And_Msg);
 317    --  Raise an exception with given exception id value. A filename and line
 318    --  number is associated with the raise and is stored in the exception
 319    --  occurrence and in addition a column and a string message M may be
 320    --  appended to this (if not null/0).
 321
 322    procedure Raise_Constraint_Error
 323      (File : System.Address;
 324       Line : Integer);
 325    pragma No_Return (Raise_Constraint_Error);
 326    pragma Export
 327      (C, Raise_Constraint_Error, "__gnat_raise_constraint_error");
 328    --  Raise constraint error with file:line information
 329
 330    procedure Raise_Constraint_Error_Msg
 331      (File   : System.Address;
 332       Line   : Integer;
 333       Column : Integer;
 334       Msg    : System.Address);
 335    pragma No_Return (Raise_Constraint_Error_Msg);
 336    pragma Export
 337      (C, Raise_Constraint_Error_Msg, "__gnat_raise_constraint_error_msg");
 338    --  Raise constraint error with file:line:col + msg information
 339
 340    procedure Raise_Program_Error
 341      (File : System.Address;
 342       Line : Integer);
 343    pragma No_Return (Raise_Program_Error);
 344    pragma Export
 345      (C, Raise_Program_Error, "__gnat_raise_program_error");
 346    --  Raise program error with file:line information
 347
 348    procedure Raise_Program_Error_Msg
 349      (File : System.Address;
 350       Line : Integer;
 351       Msg  : System.Address);
 352    pragma No_Return (Raise_Program_Error_Msg);
 353    pragma Export
 354      (C, Raise_Program_Error_Msg, "__gnat_raise_program_error_msg");
 355    --  Raise program error with file:line + msg information
 356
 357    procedure Raise_Storage_Error
 358      (File : System.Address;
 359       Line : Integer);
 360    pragma No_Return (Raise_Storage_Error);
 361    pragma Export
 362      (C, Raise_Storage_Error, "__gnat_raise_storage_error");
 363    --  Raise storage error with file:line information
 364
 365    procedure Raise_Storage_Error_Msg
 366      (File : System.Address;
 367       Line : Integer;
 368       Msg  : System.Address);
 369    pragma No_Return (Raise_Storage_Error_Msg);
 370    pragma Export
 371      (C, Raise_Storage_Error_Msg, "__gnat_raise_storage_error_msg");
 372    --  Raise storage error with file:line + reason msg information
 373
 374    --  The exception raising process and the automatic tracing mechanism rely
 375    --  on some careful use of flags attached to the exception occurrence. The
 376    --  graph below illustrates the relations between the Raise_ subprograms
 377    --  and identifies the points where basic flags such as Exception_Raised
 378    --  are initialized.
 379    --
 380    --  (i) signs indicate the flags initialization points. R stands for Raise,
 381    --  W for With, and E for Exception.
 382    --
 383    --                   R_No_Msg    R_E   R_Pe  R_Ce  R_Se
 384    --                       |        |     |     |     |
 385    --                       +--+  +--+     +---+ | +---+
 386    --                          |  |            | | |
 387    --     R_E_No_Defer(i)    R_W_Msg(i)       R_W_Loc
 388    --           |               |              |   |
 389    --           +------------+  |  +-----------+   +--+
 390    --                        |  |  |                  |
 391    --                        |  |  |             Set_E_C_Msg(i)
 392    --                        |  |  |
 393    --                   Raise_Current_Excep
 394
 395    procedure Reraise;
 396    pragma No_Return (Reraise);
 397    pragma Export (C, Reraise, "__gnat_reraise");
 398    --  Reraises the exception referenced by the Current_Excep field of
 399    --  the TSD (all fields of this exception occurrence are set). Abort
 400    --  is deferred before the reraise operation.
 401
 402    --  Save_Occurrence variations: As the management of the private data
 403    --  attached to occurrences is delicate, whether or not pointers to such
 404    --  data has to be copied in various situations is better made explicit.
 405    --  The following procedures provide an internal interface to help making
 406    --  this explicit.
 407
 408    procedure Save_Occurrence_No_Private
 409      (Target : out Exception_Occurrence;
 410       Source : Exception_Occurrence);
 411    --  Copy all the components of Source to Target, except the
 412    --  Private_Data pointer.
 413
 414    procedure Transfer_Occurrence
 415      (Target : Exception_Occurrence_Access;
 416       Source : Exception_Occurrence);
 417    pragma Export (C, Transfer_Occurrence, "__gnat_transfer_occurrence");
 418    --  Called from System.Tasking.RendezVous.Exceptional_Complete_RendezVous
 419    --  to setup Target from Source as an exception to be propagated in the
 420    --  caller task. Target is expected to be a pointer to the fixed TSD
 421    --  occurrence for this task.
 422
 423    -----------------------------
 424    -- Run-Time Check Routines --
 425    -----------------------------
 426
 427    --  These routines raise a specific exception with a reason message
 428    --  attached. The parameters are the file name and line number in each
 429    --  case. The names are keyed to the codes defined in types.ads and
 430    --  a-types.h (for example, the name Rcheck_05 refers to the Reason
 431    --  RT_Exception_Code'Val (5)).
 432
 433    procedure Rcheck_00 (File : System.Address; Line : Integer);
 434    procedure Rcheck_01 (File : System.Address; Line : Integer);
 435    procedure Rcheck_02 (File : System.Address; Line : Integer);
 436    procedure Rcheck_03 (File : System.Address; Line : Integer);
 437    procedure Rcheck_04 (File : System.Address; Line : Integer);
 438    procedure Rcheck_05 (File : System.Address; Line : Integer);
 439    procedure Rcheck_06 (File : System.Address; Line : Integer);
 440    procedure Rcheck_07 (File : System.Address; Line : Integer);
 441    procedure Rcheck_08 (File : System.Address; Line : Integer);
 442    procedure Rcheck_09 (File : System.Address; Line : Integer);
 443    procedure Rcheck_10 (File : System.Address; Line : Integer);
 444    procedure Rcheck_11 (File : System.Address; Line : Integer);
 445    procedure Rcheck_12 (File : System.Address; Line : Integer);
 446    procedure Rcheck_13 (File : System.Address; Line : Integer);
 447    procedure Rcheck_14 (File : System.Address; Line : Integer);
 448    procedure Rcheck_15 (File : System.Address; Line : Integer);
 449    procedure Rcheck_16 (File : System.Address; Line : Integer);
 450    procedure Rcheck_17 (File : System.Address; Line : Integer);
 451    procedure Rcheck_18 (File : System.Address; Line : Integer);
 452    procedure Rcheck_19 (File : System.Address; Line : Integer);
 453    procedure Rcheck_20 (File : System.Address; Line : Integer);
 454    procedure Rcheck_21 (File : System.Address; Line : Integer);
 455    procedure Rcheck_22 (File : System.Address; Line : Integer);
 456    procedure Rcheck_23 (File : System.Address; Line : Integer);
 457    procedure Rcheck_24 (File : System.Address; Line : Integer);
 458    procedure Rcheck_25 (File : System.Address; Line : Integer);
 459    procedure Rcheck_26 (File : System.Address; Line : Integer);
 460    procedure Rcheck_27 (File : System.Address; Line : Integer);
 461    procedure Rcheck_28 (File : System.Address; Line : Integer);
 462    procedure Rcheck_29 (File : System.Address; Line : Integer);
 463    procedure Rcheck_30 (File : System.Address; Line : Integer);
 464    procedure Rcheck_31 (File : System.Address; Line : Integer);
 465    procedure Rcheck_32 (File : System.Address; Line : Integer);
 466    procedure Rcheck_33 (File : System.Address; Line : Integer);
 467    procedure Rcheck_34 (File : System.Address; Line : Integer);
 468
 469    procedure Rcheck_00_Ext
 470      (File : System.Address; Line, Column : Integer);
 471    procedure Rcheck_05_Ext
 472      (File : System.Address; Line, Column, Index, First, Last : Integer);
 473    procedure Rcheck_06_Ext
 474      (File : System.Address; Line, Column, Index, First, Last : Integer);
 475    procedure Rcheck_12_Ext
 476      (File : System.Address; Line, Column, Index, First, Last : Integer);
 477
 478    pragma Export (C, Rcheck_00, "__gnat_rcheck_00");
 479    pragma Export (C, Rcheck_01, "__gnat_rcheck_01");
 480    pragma Export (C, Rcheck_02, "__gnat_rcheck_02");
 481    pragma Export (C, Rcheck_03, "__gnat_rcheck_03");
 482    pragma Export (C, Rcheck_04, "__gnat_rcheck_04");
 483    pragma Export (C, Rcheck_05, "__gnat_rcheck_05");
 484    pragma Export (C, Rcheck_06, "__gnat_rcheck_06");
 485    pragma Export (C, Rcheck_07, "__gnat_rcheck_07");
 486    pragma Export (C, Rcheck_08, "__gnat_rcheck_08");
 487    pragma Export (C, Rcheck_09, "__gnat_rcheck_09");
 488    pragma Export (C, Rcheck_10, "__gnat_rcheck_10");
 489    pragma Export (C, Rcheck_11, "__gnat_rcheck_11");
 490    pragma Export (C, Rcheck_12, "__gnat_rcheck_12");
 491    pragma Export (C, Rcheck_13, "__gnat_rcheck_13");
 492    pragma Export (C, Rcheck_14, "__gnat_rcheck_14");
 493    pragma Export (C, Rcheck_15, "__gnat_rcheck_15");
 494    pragma Export (C, Rcheck_16, "__gnat_rcheck_16");
 495    pragma Export (C, Rcheck_17, "__gnat_rcheck_17");
 496    pragma Export (C, Rcheck_18, "__gnat_rcheck_18");
 497    pragma Export (C, Rcheck_19, "__gnat_rcheck_19");
 498    pragma Export (C, Rcheck_20, "__gnat_rcheck_20");
 499    pragma Export (C, Rcheck_21, "__gnat_rcheck_21");
 500    pragma Export (C, Rcheck_22, "__gnat_rcheck_22");
 501    pragma Export (C, Rcheck_23, "__gnat_rcheck_23");
 502    pragma Export (C, Rcheck_24, "__gnat_rcheck_24");
 503    pragma Export (C, Rcheck_25, "__gnat_rcheck_25");
 504    pragma Export (C, Rcheck_26, "__gnat_rcheck_26");
 505    pragma Export (C, Rcheck_27, "__gnat_rcheck_27");
 506    pragma Export (C, Rcheck_28, "__gnat_rcheck_28");
 507    pragma Export (C, Rcheck_29, "__gnat_rcheck_29");
 508    pragma Export (C, Rcheck_30, "__gnat_rcheck_30");
 509    pragma Export (C, Rcheck_31, "__gnat_rcheck_31");
 510    pragma Export (C, Rcheck_32, "__gnat_rcheck_32");
 511    pragma Export (C, Rcheck_33, "__gnat_rcheck_33");
 512    pragma Export (C, Rcheck_34, "__gnat_rcheck_34");
 513
 514    pragma Export (C, Rcheck_00_Ext, "__gnat_rcheck_00_ext");
 515    pragma Export (C, Rcheck_05_Ext, "__gnat_rcheck_05_ext");
 516    pragma Export (C, Rcheck_06_Ext, "__gnat_rcheck_06_ext");
 517    pragma Export (C, Rcheck_12_Ext, "__gnat_rcheck_12_ext");
 518
 519    --  None of these procedures ever returns (they raise an exception!). By
 520    --  using pragma No_Return, we ensure that any junk code after the call,
 521    --  such as normal return epilog stuff, can be eliminated).
 522
 523    pragma No_Return (Rcheck_00);
 524    pragma No_Return (Rcheck_01);
 525    pragma No_Return (Rcheck_02);
 526    pragma No_Return (Rcheck_03);
 527    pragma No_Return (Rcheck_04);
 528    pragma No_Return (Rcheck_05);
 529    pragma No_Return (Rcheck_06);
 530    pragma No_Return (Rcheck_07);
 531    pragma No_Return (Rcheck_08);
 532    pragma No_Return (Rcheck_09);
 533    pragma No_Return (Rcheck_10);
 534    pragma No_Return (Rcheck_11);
 535    pragma No_Return (Rcheck_12);
 536    pragma No_Return (Rcheck_13);
 537    pragma No_Return (Rcheck_14);
 538    pragma No_Return (Rcheck_15);
 539    pragma No_Return (Rcheck_16);
 540    pragma No_Return (Rcheck_17);
 541    pragma No_Return (Rcheck_18);
 542    pragma No_Return (Rcheck_19);
 543    pragma No_Return (Rcheck_20);
 544    pragma No_Return (Rcheck_21);
 545    pragma No_Return (Rcheck_22);
 546    pragma No_Return (Rcheck_23);
 547    pragma No_Return (Rcheck_24);
 548    pragma No_Return (Rcheck_25);
 549    pragma No_Return (Rcheck_26);
 550    pragma No_Return (Rcheck_27);
 551    pragma No_Return (Rcheck_28);
 552    pragma No_Return (Rcheck_29);
 553    pragma No_Return (Rcheck_30);
 554    pragma No_Return (Rcheck_32);
 555    pragma No_Return (Rcheck_33);
 556    pragma No_Return (Rcheck_34);
 557
 558    pragma No_Return (Rcheck_00_Ext);
 559    pragma No_Return (Rcheck_05_Ext);
 560    pragma No_Return (Rcheck_06_Ext);
 561    pragma No_Return (Rcheck_12_Ext);
 562
 563    ---------------------------------------------
 564    -- Reason Strings for Run-Time Check Calls --
 565    ---------------------------------------------
 566
 567    --  These strings are null-terminated and are used by Rcheck_nn. The
 568    --  strings correspond to the definitions for Types.RT_Exception_Code.
 569
 570    use ASCII;
 571
 572    Rmsg_00 : constant String := "access check failed"              & NUL;
 573    Rmsg_01 : constant String := "access parameter is null"         & NUL;
 574    Rmsg_02 : constant String := "discriminant check failed"        & NUL;
 575    Rmsg_03 : constant String := "divide by zero"                   & NUL;
 576    Rmsg_04 : constant String := "explicit raise"                   & NUL;
 577    Rmsg_05 : constant String := "index check failed"               & NUL;
 578    Rmsg_06 : constant String := "invalid data"                     & NUL;
 579    Rmsg_07 : constant String := "length check failed"              & NUL;
 580    Rmsg_08 : constant String := "null Exception_Id"                & NUL;
 581    Rmsg_09 : constant String := "null-exclusion check failed"      & NUL;
 582    Rmsg_10 : constant String := "overflow check failed"            & NUL;
 583    Rmsg_11 : constant String := "partition check failed"           & NUL;
 584    Rmsg_12 : constant String := "range check failed"               & NUL;
 585    Rmsg_13 : constant String := "tag check failed"                 & NUL;
 586    Rmsg_14 : constant String := "access before elaboration"        & NUL;
 587    Rmsg_15 : constant String := "accessibility check failed"       & NUL;
 588    Rmsg_16 : constant String := "attempt to take address of"       &
 589                                 " intrinsic subprogram"            & NUL;
 590    Rmsg_17 : constant String := "all guards closed"                & NUL;
 591    Rmsg_18 : constant String := "improper use of generic subtype"  &
 592                                 " with predicate"                  & NUL;
 593    Rmsg_19 : constant String := "Current_Task referenced in entry" &
 594                                 " body"                            & NUL;
 595    Rmsg_20 : constant String := "duplicated entry address"         & NUL;
 596    Rmsg_21 : constant String := "explicit raise"                   & NUL;
 597    Rmsg_22 : constant String := "finalize/adjust raised exception" & NUL;
 598    Rmsg_23 : constant String := "implicit return with No_Return"   & NUL;
 599    Rmsg_24 : constant String := "misaligned address value"         & NUL;
 600    Rmsg_25 : constant String := "missing return"                   & NUL;
 601    Rmsg_26 : constant String := "overlaid controlled object"       & NUL;
 602    Rmsg_27 : constant String := "potentially blocking operation"   & NUL;
 603    Rmsg_28 : constant String := "stubbed subprogram called"        & NUL;
 604    Rmsg_29 : constant String := "unchecked union restriction"      & NUL;
 605    Rmsg_30 : constant String := "actual/returned class-wide"       &
 606                                 " value not transportable"         & NUL;
 607    Rmsg_31 : constant String := "empty storage pool"               & NUL;
 608    Rmsg_32 : constant String := "explicit raise"                   & NUL;
 609    Rmsg_33 : constant String := "infinite recursion"               & NUL;
 610    Rmsg_34 : constant String := "object too large"                 & NUL;
 611
 612    -----------------------
 613    -- Polling Interface --
 614    -----------------------
 615
 616    type Unsigned is mod 2 ** 32;
 617
 618    Counter : Unsigned := 0;
 619    pragma Warnings (Off, Counter);
 620    --  This counter is provided for convenience. It can be used in Poll to
 621    --  perform periodic but not systematic operations.
 622
 623    procedure Poll is separate;
 624    --  The actual polling routine is separate, so that it can easily
 625    --  be replaced with a target dependent version.
 626
 627    --------------------------
 628    -- Code_Address_For_AAA --
 629    --------------------------
 630
 631    --  This function gives us the start of the PC range for addresses
 632    --  within the exception unit itself. We hope that gigi/gcc keep all the
 633    --  procedures in their original order!
 634
 635    function Code_Address_For_AAA return System.Address is
 636    begin
 637       --  We are using a label instead of merely using
 638       --  Code_Address_For_AAA'Address because on some platforms the latter
 639       --  does not yield the address we want, but the address of a stub or of
 640       --  a descriptor instead. This is the case at least on Alpha-VMS and
 641       --  PA-HPUX.
 642
 643       <<Start_Of_AAA>>
 644       return Start_Of_AAA'Address;
 645    end Code_Address_For_AAA;
 646
 647    ----------------
 648    -- Call_Chain --
 649    ----------------
 650
 651    procedure Call_Chain (Excep : EOA) is separate;
 652    --  The actual Call_Chain routine is separate, so that it can easily
 653    --  be dummied out when no exception traceback information is needed.
 654
 655    ------------------------------
 656    -- Current_Target_Exception --
 657    ------------------------------
 658
 659    function Current_Target_Exception return Exception_Occurrence is
 660    begin
 661       return Null_Occurrence;
 662    end Current_Target_Exception;
 663
 664    -------------------
 665    -- EId_To_String --
 666    -------------------
 667
 668    function EId_To_String (X : Exception_Id) return String
 669      renames Stream_Attributes.EId_To_String;
 670
 671    ------------------
 672    -- EO_To_String --
 673    ------------------
 674
 675    --  We use the null string to represent the null occurrence, otherwise
 676    --  we output the Exception_Information string for the occurrence.
 677
 678    function EO_To_String (X : Exception_Occurrence) return String
 679      renames Stream_Attributes.EO_To_String;
 680
 681    ------------------------
 682    -- Exception_Identity --
 683    ------------------------
 684
 685    function Exception_Identity
 686      (X : Exception_Occurrence) return Exception_Id
 687    is
 688    begin
 689       --  Note that the following test used to be here for the original
 690       --  Ada 95 semantics, but these were modified by AI-241 to require
 691       --  returning Null_Id instead of raising Constraint_Error.
 692
 693       --  if X.Id = Null_Id then
 694       --     raise Constraint_Error;
 695       --  end if;
 696
 697       return X.Id;
 698    end Exception_Identity;
 699
 700    ---------------------------
 701    -- Exception_Information --
 702    ---------------------------
 703
 704    function Exception_Information (X : Exception_Occurrence) return String is
 705    begin
 706       if X.Id = Null_Id then
 707          raise Constraint_Error;
 708       end if;
 709
 710       return Exception_Data.Exception_Information (X);
 711    end Exception_Information;
 712
 713    -----------------------
 714    -- Exception_Message --
 715    -----------------------
 716
 717    function Exception_Message (X : Exception_Occurrence) return String is
 718    begin
 719       if X.Id = Null_Id then
 720          raise Constraint_Error;
 721       end if;
 722
 723       return X.Msg (1 .. X.Msg_Length);
 724    end Exception_Message;
 725
 726    --------------------
 727    -- Exception_Name --
 728    --------------------
 729
 730    function Exception_Name (Id : Exception_Id) return String is
 731    begin
 732       if Id = null then
 733          raise Constraint_Error;
 734       end if;
 735
 736       return To_Ptr (Id.Full_Name) (1 .. Id.Name_Length - 1);
 737    end Exception_Name;
 738
 739    function Exception_Name (X : Exception_Occurrence) return String is
 740    begin
 741       return Exception_Name (X.Id);
 742    end Exception_Name;
 743
 744    ---------------------------
 745    -- Exception_Name_Simple --
 746    ---------------------------
 747
 748    function Exception_Name_Simple (X : Exception_Occurrence) return String is
 749       Name : constant String := Exception_Name (X);
 750       P    : Natural;
 751
 752    begin
 753       P := Name'Length;
 754       while P > 1 loop
 755          exit when Name (P - 1) = '.';
 756          P := P - 1;
 757       end loop;
 758
 759       --  Return result making sure lower bound is 1
 760
 761       declare
 762          subtype Rname is String (1 .. Name'Length - P + 1);
 763       begin
 764          return Rname (Name (P .. Name'Length));
 765       end;
 766    end Exception_Name_Simple;
 767
 768    --------------------
 769    -- Exception_Data --
 770    --------------------
 771
 772    package body Exception_Data is separate;
 773    --  This package can be easily dummied out if we do not want the
 774    --  basic support for exception messages (such as in Ada 83).
 775
 776    ---------------------------
 777    -- Exception_Propagation --
 778    ---------------------------
 779
 780    package body Exception_Propagation is separate;
 781    --  Depending on the actual exception mechanism used (front-end or
 782    --  back-end based), the implementation will differ, which is why this
 783    --  package is separated.
 784
 785    ----------------------
 786    -- Exception_Traces --
 787    ----------------------
 788
 789    package body Exception_Traces is separate;
 790    --  Depending on the underlying support for IO the implementation
 791    --  will differ. Moreover we would like to dummy out this package
 792    --  in case we do not want any exception tracing support. This is
 793    --  why this package is separated.
 794
 795    -----------------------
 796    -- Stream Attributes --
 797    -----------------------
 798
 799    package body Stream_Attributes is separate;
 800    --  This package can be easily dummied out if we do not want the
 801    --  support for streaming Exception_Ids and Exception_Occurrences.
 802
 803    ----------------------------
 804    -- Raise_Constraint_Error --
 805    ----------------------------
 806
 807    procedure Raise_Constraint_Error (File : System.Address; Line : Integer) is
 808    begin
 809       Raise_With_Location_And_Msg (Constraint_Error_Def'Access, File, Line);
 810    end Raise_Constraint_Error;
 811
 812    --------------------------------
 813    -- Raise_Constraint_Error_Msg --
 814    --------------------------------
 815
 816    procedure Raise_Constraint_Error_Msg
 817      (File   : System.Address;
 818       Line   : Integer;
 819       Column : Integer;
 820       Msg    : System.Address)
 821    is
 822    begin
 823       Raise_With_Location_And_Msg
 824         (Constraint_Error_Def'Access, File, Line, Column, Msg);
 825    end Raise_Constraint_Error_Msg;
 826
 827    -------------------------
 828    -- Raise_Current_Excep --
 829    -------------------------
 830
 831    procedure Raise_Current_Excep (E : Exception_Id) is
 832
 833       pragma Inspection_Point (E);
 834       --  This is so the debugger can reliably inspect the parameter when
 835       --  inserting a breakpoint at the start of this procedure.
 836
 837       --  To provide support for breakpoints on unhandled exceptions, the
 838       --  debugger will also need to be able to inspect the value of E from
 839       --  inner frames so we need to make sure that its value is also spilled
 840       --  on stack.  We take the address and dereference using volatile local
 841       --  objects for this purpose.
 842
 843       --  The pragma Warnings (Off) are needed because the compiler knows that
 844       --  these locals are not referenced and that this use of pragma Volatile
 845       --  is peculiar!
 846
 847       type EID_Access is access Exception_Id;
 848
 849       Access_To_E : EID_Access := E'Unrestricted_Access;
 850       pragma Volatile (Access_To_E);
 851       pragma Warnings (Off, Access_To_E);
 852
 853       Id : Exception_Id := Access_To_E.all;
 854       pragma Volatile (Id);
 855       pragma Warnings (Off, Id);
 856
 857    begin
 858       Debug_Raise_Exception (E => SSL.Exception_Data_Ptr (E));
 859       Exception_Propagation.Propagate_Exception
 860         (E => E, From_Signal_Handler => False);
 861    end Raise_Current_Excep;
 862
 863    ---------------------
 864    -- Raise_Exception --
 865    ---------------------
 866
 867    procedure Raise_Exception
 868      (E       : Exception_Id;
 869       Message : String := "")
 870    is
 871       EF : Exception_Id := E;
 872
 873    begin
 874       --  Raise CE if E = Null_ID (AI-446)
 875
 876       if E = null then
 877          EF := Constraint_Error'Identity;
 878       end if;
 879
 880       --  Go ahead and raise appropriate exception
 881
 882       Exception_Data.Set_Exception_Msg (EF, Message);
 883       Abort_Defer.all;
 884       Raise_Current_Excep (EF);
 885    end Raise_Exception;
 886
 887    ----------------------------
 888    -- Raise_Exception_Always --
 889    ----------------------------
 890
 891    procedure Raise_Exception_Always
 892      (E       : Exception_Id;
 893       Message : String := "")
 894    is
 895    begin
 896       Exception_Data.Set_Exception_Msg (E, Message);
 897       Abort_Defer.all;
 898       Raise_Current_Excep (E);
 899    end Raise_Exception_Always;
 900
 901    -------------------------------------
 902    -- Raise_From_Controlled_Operation --
 903    -------------------------------------
 904
 905    procedure Raise_From_Controlled_Operation
 906      (X : Ada.Exceptions.Exception_Occurrence)
 907    is
 908       Prefix   : constant String := "adjust/finalize raised ";
 909       Orig_Msg : constant String := Exception_Message (X);
 910       New_Msg  : constant String := Prefix & Exception_Name (X);
 911
 912    begin
 913       if Orig_Msg'Length >= Prefix'Length
 914         and then
 915           Orig_Msg (Orig_Msg'First .. Orig_Msg'First + Prefix'Length - 1) =
 916                                                                      Prefix
 917       then
 918          --  Message already has proper prefix, just re-reraise PROGRAM_ERROR
 919
 920          Raise_Exception_No_Defer
 921            (E       => Program_Error'Identity,
 922             Message => Orig_Msg);
 923
 924       elsif Orig_Msg = "" then
 925
 926          --  No message present: just provide our own
 927
 928          Raise_Exception_No_Defer
 929            (E       => Program_Error'Identity,
 930             Message => New_Msg);
 931
 932       else
 933          --  Message present, add informational prefix
 934
 935          Raise_Exception_No_Defer
 936            (E       => Program_Error'Identity,
 937             Message => New_Msg & ": " & Orig_Msg);
 938       end if;
 939    end Raise_From_Controlled_Operation;
 940
 941    -------------------------------
 942    -- Raise_From_Signal_Handler --
 943    -------------------------------
 944
 945    procedure Raise_From_Signal_Handler
 946      (E : Exception_Id;
 947       M : System.Address)
 948    is
 949    begin
 950       Exception_Data.Set_Exception_C_Msg (E, M);
 951       Abort_Defer.all;
 952       Exception_Propagation.Propagate_Exception
 953         (E => E, From_Signal_Handler => True);
 954    end Raise_From_Signal_Handler;
 955
 956    -------------------------
 957    -- Raise_Program_Error --
 958    -------------------------
 959
 960    procedure Raise_Program_Error
 961      (File : System.Address;
 962       Line : Integer)
 963    is
 964    begin
 965       Raise_With_Location_And_Msg (Program_Error_Def'Access, File, Line);
 966    end Raise_Program_Error;
 967
 968    -----------------------------
 969    -- Raise_Program_Error_Msg --
 970    -----------------------------
 971
 972    procedure Raise_Program_Error_Msg
 973      (File : System.Address;
 974       Line : Integer;
 975       Msg  : System.Address)
 976    is
 977    begin
 978       Raise_With_Location_And_Msg
 979         (Program_Error_Def'Access, File, Line, M => Msg);
 980    end Raise_Program_Error_Msg;
 981
 982    -------------------------
 983    -- Raise_Storage_Error --
 984    -------------------------
 985
 986    procedure Raise_Storage_Error
 987      (File : System.Address;
 988       Line : Integer)
 989    is
 990    begin
 991       Raise_With_Location_And_Msg (Storage_Error_Def'Access, File, Line);
 992    end Raise_Storage_Error;
 993
 994    -----------------------------
 995    -- Raise_Storage_Error_Msg --
 996    -----------------------------
 997
 998    procedure Raise_Storage_Error_Msg
 999      (File : System.Address;
1000       Line : Integer;
1001       Msg  : System.Address)
1002    is
1003    begin
1004       Raise_With_Location_And_Msg
1005         (Storage_Error_Def'Access, File, Line, M => Msg);
1006    end Raise_Storage_Error_Msg;
1007
1008    ---------------------------------
1009    -- Raise_With_Location_And_Msg --
1010    ---------------------------------
1011
1012    procedure Raise_With_Location_And_Msg
1013      (E : Exception_Id;
1014       F : System.Address;
1015       L : Integer;
1016       C : Integer := 0;
1017       M : System.Address := System.Null_Address)
1018    is
1019    begin
1020       Exception_Data.Set_Exception_C_Msg (E, F, L, C, M);
1021       Abort_Defer.all;
1022       Raise_Current_Excep (E);
1023    end Raise_With_Location_And_Msg;
1024
1025    --------------------
1026    -- Raise_With_Msg --
1027    --------------------
1028
1029    procedure Raise_With_Msg (E : Exception_Id) is
1030       Excep : constant EOA := Get_Current_Excep.all;
1031
1032    begin
1033       Exception_Propagation.Setup_Exception (Excep, Excep);
1034
1035       Excep.Exception_Raised := False;
1036       Excep.Id               := E;
1037       Excep.Num_Tracebacks   := 0;
1038       Excep.Cleanup_Flag     := False;
1039       Excep.Pid              := Local_Partition_ID;
1040       Abort_Defer.all;
1041       Raise_Current_Excep (E);
1042    end Raise_With_Msg;
1043
1044    -----------
1045    -- Image --
1046    -----------
1047
1048    function Image (Index : Integer) return String is
1049       Result : constant String := Integer'Image (Index);
1050    begin
1051       if Result (1) = ' ' then
1052          return Result (2 .. Result'Last);
1053       else
1054          return Result;
1055       end if;
1056    end Image;
1057
1058    --------------------------------------
1059    -- Calls to Run-Time Check Routines --
1060    --------------------------------------
1061
1062    procedure Rcheck_00 (File : System.Address; Line : Integer) is
1063    begin
1064       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_00'Address);
1065    end Rcheck_00;
1066
1067    procedure Rcheck_01 (File : System.Address; Line : Integer) is
1068    begin
1069       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_01'Address);
1070    end Rcheck_01;
1071
1072    procedure Rcheck_02 (File : System.Address; Line : Integer) is
1073    begin
1074       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_02'Address);
1075    end Rcheck_02;
1076
1077    procedure Rcheck_03 (File : System.Address; Line : Integer) is
1078    begin
1079       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_03'Address);
1080    end Rcheck_03;
1081
1082    procedure Rcheck_04 (File : System.Address; Line : Integer) is
1083    begin
1084       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_04'Address);
1085    end Rcheck_04;
1086
1087    procedure Rcheck_05 (File : System.Address; Line : Integer) is
1088    begin
1089       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_05'Address);
1090    end Rcheck_05;
1091
1092    procedure Rcheck_06 (File : System.Address; Line : Integer) is
1093    begin
1094       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_06'Address);
1095    end Rcheck_06;
1096
1097    procedure Rcheck_07 (File : System.Address; Line : Integer) is
1098    begin
1099       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_07'Address);
1100    end Rcheck_07;
1101
1102    procedure Rcheck_08 (File : System.Address; Line : Integer) is
1103    begin
1104       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_08'Address);
1105    end Rcheck_08;
1106
1107    procedure Rcheck_09 (File : System.Address; Line : Integer) is
1108    begin
1109       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_09'Address);
1110    end Rcheck_09;
1111
1112    procedure Rcheck_10 (File : System.Address; Line : Integer) is
1113    begin
1114       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_10'Address);
1115    end Rcheck_10;
1116
1117    procedure Rcheck_11 (File : System.Address; Line : Integer) is
1118    begin
1119       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_11'Address);
1120    end Rcheck_11;
1121
1122    procedure Rcheck_12 (File : System.Address; Line : Integer) is
1123    begin
1124       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_12'Address);
1125    end Rcheck_12;
1126
1127    procedure Rcheck_13 (File : System.Address; Line : Integer) is
1128    begin
1129       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_13'Address);
1130    end Rcheck_13;
1131
1132    procedure Rcheck_14 (File : System.Address; Line : Integer) is
1133    begin
1134       Raise_Program_Error_Msg (File, Line, Rmsg_14'Address);
1135    end Rcheck_14;
1136
1137    procedure Rcheck_15 (File : System.Address; Line : Integer) is
1138    begin
1139       Raise_Program_Error_Msg (File, Line, Rmsg_15'Address);
1140    end Rcheck_15;
1141
1142    procedure Rcheck_16 (File : System.Address; Line : Integer) is
1143    begin
1144       Raise_Program_Error_Msg (File, Line, Rmsg_16'Address);
1145    end Rcheck_16;
1146
1147    procedure Rcheck_17 (File : System.Address; Line : Integer) is
1148    begin
1149       Raise_Program_Error_Msg (File, Line, Rmsg_17'Address);
1150    end Rcheck_17;
1151
1152    procedure Rcheck_18 (File : System.Address; Line : Integer) is
1153    begin
1154       Raise_Program_Error_Msg (File, Line, Rmsg_18'Address);
1155    end Rcheck_18;
1156
1157    procedure Rcheck_19 (File : System.Address; Line : Integer) is
1158    begin
1159       Raise_Program_Error_Msg (File, Line, Rmsg_19'Address);
1160    end Rcheck_19;
1161
1162    procedure Rcheck_20 (File : System.Address; Line : Integer) is
1163    begin
1164       Raise_Program_Error_Msg (File, Line, Rmsg_20'Address);
1165    end Rcheck_20;
1166
1167    procedure Rcheck_21 (File : System.Address; Line : Integer) is
1168    begin
1169       Raise_Program_Error_Msg (File, Line, Rmsg_21'Address);
1170    end Rcheck_21;
1171
1172    procedure Rcheck_22 (File : System.Address; Line : Integer) is
1173    begin
1174       Raise_Program_Error_Msg (File, Line, Rmsg_22'Address);
1175    end Rcheck_22;
1176
1177    procedure Rcheck_23 (File : System.Address; Line : Integer) is
1178    begin
1179       Raise_Program_Error_Msg (File, Line, Rmsg_23'Address);
1180    end Rcheck_23;
1181
1182    procedure Rcheck_24 (File : System.Address; Line : Integer) is
1183    begin
1184       Raise_Program_Error_Msg (File, Line, Rmsg_24'Address);
1185    end Rcheck_24;
1186
1187    procedure Rcheck_25 (File : System.Address; Line : Integer) is
1188    begin
1189       Raise_Program_Error_Msg (File, Line, Rmsg_25'Address);
1190    end Rcheck_25;
1191
1192    procedure Rcheck_26 (File : System.Address; Line : Integer) is
1193    begin
1194       Raise_Program_Error_Msg (File, Line, Rmsg_26'Address);
1195    end Rcheck_26;
1196
1197    procedure Rcheck_27 (File : System.Address; Line : Integer) is
1198    begin
1199       Raise_Program_Error_Msg (File, Line, Rmsg_27'Address);
1200    end Rcheck_27;
1201
1202    procedure Rcheck_28 (File : System.Address; Line : Integer) is
1203    begin
1204       Raise_Program_Error_Msg (File, Line, Rmsg_28'Address);
1205    end Rcheck_28;
1206
1207    procedure Rcheck_29 (File : System.Address; Line : Integer) is
1208    begin
1209       Raise_Program_Error_Msg (File, Line, Rmsg_29'Address);
1210    end Rcheck_29;
1211
1212    procedure Rcheck_30 (File : System.Address; Line : Integer) is
1213    begin
1214       Raise_Program_Error_Msg (File, Line, Rmsg_30'Address);
1215    end Rcheck_30;
1216
1217    procedure Rcheck_31 (File : System.Address; Line : Integer) is
1218    begin
1219       Raise_Storage_Error_Msg (File, Line, Rmsg_31'Address);
1220    end Rcheck_31;
1221
1222    procedure Rcheck_32 (File : System.Address; Line : Integer) is
1223    begin
1224       Raise_Storage_Error_Msg (File, Line, Rmsg_32'Address);
1225    end Rcheck_32;
1226
1227    procedure Rcheck_33 (File : System.Address; Line : Integer) is
1228    begin
1229       Raise_Storage_Error_Msg (File, Line, Rmsg_33'Address);
1230    end Rcheck_33;
1231
1232    procedure Rcheck_34 (File : System.Address; Line : Integer) is
1233    begin
1234       Raise_Storage_Error_Msg (File, Line, Rmsg_34'Address);
1235    end Rcheck_34;
1236
1237    procedure Rcheck_00_Ext (File : System.Address; Line, Column : Integer) is
1238    begin
1239       Raise_Constraint_Error_Msg (File, Line, Column, Rmsg_00'Address);
1240    end Rcheck_00_Ext;
1241
1242    procedure Rcheck_05_Ext
1243      (File : System.Address; Line, Column, Index, First, Last : Integer)
1244    is
1245       Msg : constant String :=
1246               Rmsg_05 (Rmsg_05'First .. Rmsg_05'Last - 1) & ASCII.LF &
1247               "index " & Image (Index) & " not in " & Image (First) &
1248               ".." & Image (Last) & ASCII.NUL;
1249    begin
1250       Raise_Constraint_Error_Msg (File, Line, Column, Msg'Address);
1251    end Rcheck_05_Ext;
1252
1253    procedure Rcheck_06_Ext
1254      (File : System.Address; Line, Column, Index, First, Last : Integer)
1255    is
1256       Msg : constant String :=
1257               Rmsg_06 (Rmsg_06'First .. Rmsg_06'Last - 1) & ASCII.LF &
1258               "value " & Image (Index) & " not in " & Image (First) &
1259               ".." & Image (Last) & ASCII.NUL;
1260    begin
1261       Raise_Constraint_Error_Msg (File, Line, Column, Msg'Address);
1262    end Rcheck_06_Ext;
1263
1264    procedure Rcheck_12_Ext
1265      (File : System.Address; Line, Column, Index, First, Last : Integer)
1266    is
1267       Msg : constant String :=
1268               Rmsg_12 (Rmsg_12'First .. Rmsg_12'Last - 1) & ASCII.LF &
1269               "value " & Image (Index) & " not in " & Image (First) &
1270               ".." & Image (Last) & ASCII.NUL;
1271    begin
1272       Raise_Constraint_Error_Msg (File, Line, Column, Msg'Address);
1273    end Rcheck_12_Ext;
1274
1275    -------------
1276    -- Reraise --
1277    -------------
1278
1279    procedure Reraise is
1280       Excep : constant EOA := Get_Current_Excep.all;
1281    begin
1282       Abort_Defer.all;
1283       Exception_Propagation.Setup_Exception (Excep, Excep, Reraised => True);
1284       Raise_Current_Excep (Excep.Id);
1285    end Reraise;
1286
1287    ------------------------
1288    -- Reraise_Occurrence --
1289    ------------------------
1290
1291    procedure Reraise_Occurrence (X : Exception_Occurrence) is
1292    begin
1293       if X.Id /= null then
1294          Abort_Defer.all;
1295          Exception_Propagation.Setup_Exception
1296            (X'Unrestricted_Access, Get_Current_Excep.all, Reraised => True);
1297          Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1298          Raise_Current_Excep (X.Id);
1299       end if;
1300    end Reraise_Occurrence;
1301
1302    -------------------------------
1303    -- Reraise_Occurrence_Always --
1304    -------------------------------
1305
1306    procedure Reraise_Occurrence_Always (X : Exception_Occurrence) is
1307    begin
1308       Abort_Defer.all;
1309       Exception_Propagation.Setup_Exception
1310         (X'Unrestricted_Access, Get_Current_Excep.all, Reraised => True);
1311       Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1312       Raise_Current_Excep (X.Id);
1313    end Reraise_Occurrence_Always;
1314
1315    ---------------------------------
1316    -- Reraise_Occurrence_No_Defer --
1317    ---------------------------------
1318
1319    procedure Reraise_Occurrence_No_Defer (X : Exception_Occurrence) is
1320    begin
1321       Exception_Propagation.Setup_Exception
1322         (X'Unrestricted_Access, Get_Current_Excep.all, Reraised => True);
1323       Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1324       Raise_Current_Excep (X.Id);
1325    end Reraise_Occurrence_No_Defer;
1326
1327    ---------------------
1328    -- Save_Occurrence --
1329    ---------------------
1330
1331    procedure Save_Occurrence
1332      (Target : out Exception_Occurrence;
1333       Source : Exception_Occurrence)
1334    is
1335    begin
1336       Save_Occurrence_No_Private (Target, Source);
1337    end Save_Occurrence;
1338
1339    function Save_Occurrence (Source : Exception_Occurrence) return EOA is
1340       Target : constant EOA := new Exception_Occurrence;
1341    begin
1342       Save_Occurrence (Target.all, Source);
1343       return Target;
1344    end Save_Occurrence;
1345
1346    --------------------------------
1347    -- Save_Occurrence_No_Private --
1348    --------------------------------
1349
1350    procedure Save_Occurrence_No_Private
1351      (Target : out Exception_Occurrence;
1352       Source : Exception_Occurrence)
1353    is
1354    begin
1355       Target.Id             := Source.Id;
1356       Target.Msg_Length     := Source.Msg_Length;
1357       Target.Num_Tracebacks := Source.Num_Tracebacks;
1358       Target.Pid            := Source.Pid;
1359       Target.Cleanup_Flag   := Source.Cleanup_Flag;
1360
1361       Target.Msg (1 .. Target.Msg_Length) :=
1362         Source.Msg (1 .. Target.Msg_Length);
1363
1364       Target.Tracebacks (1 .. Target.Num_Tracebacks) :=
1365         Source.Tracebacks (1 .. Target.Num_Tracebacks);
1366    end Save_Occurrence_No_Private;
1367
1368    -------------------------
1369    -- Transfer_Occurrence --
1370    -------------------------
1371
1372    procedure Transfer_Occurrence
1373      (Target : Exception_Occurrence_Access;
1374       Source : Exception_Occurrence)
1375    is
1376    begin
1377       --  Setup Target as an exception to be propagated in the calling task
1378       --  (rendezvous-wise), taking care not to clobber the associated private
1379       --  data.  Target is expected to be a pointer to the calling task's
1380       --  fixed TSD occurrence, which is very different from Get_Current_Excep
1381       --  here because this subprogram is called from the called task.
1382
1383       Exception_Propagation.Setup_Exception (Target, Target);
1384       Save_Occurrence_No_Private (Target.all, Source);
1385    end Transfer_Occurrence;
1386
1387    -------------------
1388    -- String_To_EId --
1389    -------------------
1390
1391    function String_To_EId (S : String) return Exception_Id
1392      renames Stream_Attributes.String_To_EId;
1393
1394    ------------------
1395    -- String_To_EO --
1396    ------------------
1397
1398    function String_To_EO (S : String) return Exception_Occurrence
1399      renames Stream_Attributes.String_To_EO;
1400
1401    ------------------------------
1402    -- Raise_Exception_No_Defer --
1403    ------------------------------
1404
1405    procedure Raise_Exception_No_Defer
1406      (E       : Exception_Id;
1407       Message : String := "")
1408    is
1409    begin
1410       Exception_Data.Set_Exception_Msg (E, Message);
1411
1412       --  Do not call Abort_Defer.all, as specified by the spec
1413
1414       Raise_Current_Excep (E);
1415    end Raise_Exception_No_Defer;
1416
1417    ---------------
1418    -- To_Stderr --
1419    ---------------
1420
1421    procedure To_Stderr (C : Character) is
1422       type int is new Integer;
1423
1424       procedure put_char_stderr (C : int);
1425       pragma Import (C, put_char_stderr, "put_char_stderr");
1426
1427    begin
1428       put_char_stderr (Character'Pos (C));
1429    end To_Stderr;
1430
1431    procedure To_Stderr (S : String) is
1432    begin
1433       for J in S'Range loop
1434          if S (J) /= ASCII.CR then
1435             To_Stderr (S (J));
1436          end if;
1437       end loop;
1438    end To_Stderr;
1439
1440    -------------------------
1441    -- Wide_Exception_Name --
1442    -------------------------
1443
1444    WC_Encoding : Character;
1445    pragma Import (C, WC_Encoding, "__gl_wc_encoding");
1446    --  Encoding method for source, as exported by binder
1447
1448    function Wide_Exception_Name
1449      (Id : Exception_Id) return Wide_String
1450    is
1451       S : constant String := Exception_Name (Id);
1452       W : Wide_String (1 .. S'Length);
1453       L : Natural;
1454    begin
1455       String_To_Wide_String
1456         (S, W, L, Get_WC_Encoding_Method (WC_Encoding));
1457       return W (1 .. L);
1458    end Wide_Exception_Name;
1459
1460    function Wide_Exception_Name
1461      (X : Exception_Occurrence) return Wide_String
1462    is
1463       S : constant String := Exception_Name (X);
1464       W : Wide_String (1 .. S'Length);
1465       L : Natural;
1466    begin
1467       String_To_Wide_String
1468         (S, W, L, Get_WC_Encoding_Method (WC_Encoding));
1469       return W (1 .. L);
1470    end Wide_Exception_Name;
1471
1472    ----------------------------
1473    -- Wide_Wide_Exception_Name --
1474    -----------------------------
1475
1476    function Wide_Wide_Exception_Name
1477      (Id : Exception_Id) return Wide_Wide_String
1478    is
1479       S : constant String := Exception_Name (Id);
1480       W : Wide_Wide_String (1 .. S'Length);
1481       L : Natural;
1482    begin
1483       String_To_Wide_Wide_String
1484         (S, W, L, Get_WC_Encoding_Method (WC_Encoding));
1485       return W (1 .. L);
1486    end Wide_Wide_Exception_Name;
1487
1488    function Wide_Wide_Exception_Name
1489      (X : Exception_Occurrence) return Wide_Wide_String
1490    is
1491       S : constant String := Exception_Name (X);
1492       W : Wide_Wide_String (1 .. S'Length);
1493       L : Natural;
1494    begin
1495       String_To_Wide_Wide_String
1496         (S, W, L, Get_WC_Encoding_Method (WC_Encoding));
1497       return W (1 .. L);
1498    end Wide_Wide_Exception_Name;
1499
1500    --------------------------
1501    -- Code_Address_For_ZZZ --
1502    --------------------------
1503
1504    --  This function gives us the end of the PC range for addresses
1505    --  within the exception unit itself. We hope that gigi/gcc keeps all the
1506    --  procedures in their original order!
1507
1508    function Code_Address_For_ZZZ return System.Address is
1509    begin
1510       <<Start_Of_ZZZ>>
1511       return Start_Of_ZZZ'Address;
1512    end Code_Address_For_ZZZ;
1513
1514 end Ada.Exceptions;