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) 1992-2004 Free Software Foundation, Inc.          --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 2,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License --
  17 -- for  more details.  You should have  received  a copy of the GNU General --
  18 -- Public License  distributed with GNAT;  see file COPYING.  If not, write --
  19 -- to  the Free Software Foundation,  59 Temple Place - Suite 330,  Boston, --
  20 -- MA 02111-1307, USA.                                                      --
  21 --                                                                          --
  22 -- As a special exception,  if other files  instantiate  generics from this --
  23 -- unit, or you link  this unit with other files  to produce an executable, --
  24 -- this  unit  does not  by itself cause  the resulting  executable  to  be --
  25 -- covered  by the  GNU  General  Public  License.  This exception does not --
  26 -- however invalidate  any other reasons why  the executable file  might be --
  27 -- covered by the  GNU Public License.                                      --
  28 --                                                                          --
  29 -- GNAT was originally developed  by the GNAT team at  New York University. --
  30 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  31 --                                                                          --
  32 ------------------------------------------------------------------------------
  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 pragma Warnings (Off);
  39 --  Since several constructs give warnings in 3.14a1, including unreferenced
  40 --  variables and pragma Unreferenced itself.
  41
  42 with System;                  use System;
  43 with System.Standard_Library; use System.Standard_Library;
  44 with System.Soft_Links;       use System.Soft_Links;
  45 with System.Machine_State_Operations; use System.Machine_State_Operations;
  46
  47 package body Ada.Exceptions is
  48
  49    procedure builtin_longjmp (buffer : Address; Flag : Integer);
  50    pragma No_Return (builtin_longjmp);
  51    pragma Import (C, builtin_longjmp, "_gnat_builtin_longjmp");
  52
  53    pragma Suppress (All_Checks);
  54    --  We definitely do not want exceptions occurring within this unit, or
  55    --  we are in big trouble. If an exceptional situation does occur, better
  56    --  that it not be raised, since raising it can cause confusing chaos.
  57
  58    Zero_Cost_Exceptions : Integer;
  59    pragma Import (C, Zero_Cost_Exceptions, "__gl_zero_cost_exceptions");
  60    --  Boolean indicating if we are handling exceptions using a zero cost
  61    --  mechanism.
  62    --
  63    --  Note that although we currently do not support it, the GCC3 back-end
  64    --  tables are also potentially useable for setjmp/longjmp processing.
  65
  66    -----------------------
  67    -- Local Subprograms --
  68    -----------------------
  69
  70    --  Note: the exported subprograms in this package body are called directly
  71    --  from C clients using the given external name, even though they are not
  72    --  technically visible in the Ada sense.
  73
  74    procedure AAA;
  75    procedure ZZZ;
  76    --  Mark start and end of procedures in this package
  77    --
  78    --  The AAA and ZZZ procedures are used to provide exclusion bounds in
  79    --  calls to Call_Chain at exception raise points from this unit. The
  80    --  purpose is to arrange for the exception tracebacks not to include
  81    --  frames from routines involved in the raise process, as these are
  82    --  meaningless from the user's standpoint.
  83    --
  84    --  For these bounds to be meaningful, we need to ensure that the object
  85    --  code for the routines involved in processing a raise is located after
  86    --  the object code for AAA and before the object code for ZZZ. This will
  87    --  indeed be the case as long as the following rules are respected:
  88    --
  89    --  1) The bodies of the subprograms involved in processing a raise
  90    --     are located after the body of AAA and before the body of ZZZ.
  91    --
  92    --  2) No pragma Inline applies to any of these subprograms, as this
  93    --     could delay the corresponding assembly output until the end of
  94    --     the unit.
  95
  96    Code_Address_For_AAA, Code_Address_For_ZZZ : System.Address;
  97    --  Used to represent addresses really inside the code range for AAA and
  98    --  ZZZ, initialized to the address of a label inside the corresponding
  99    --  procedure. This is initialization takes place inside the procedures
 100    --  themselves, which are called as part of the elaboration code.
 101    --
 102    --  We are doing this instead of merely using Proc'Address because on some
 103    --  platforms the latter does not yield the address we want, but the
 104    --  address of a stub or of a descriptor instead. This is the case at least
 105    --  on Alpha-VMS and PA-HPUX.
 106
 107    procedure Call_Chain (Excep : EOA);
 108    --  Store up to Max_Tracebacks in Excep, corresponding to the current
 109    --  call chain.
 110
 111    procedure Process_Raise_Exception
 112      (E                   : Exception_Id;
 113       From_Signal_Handler : Boolean);
 114    pragma No_Return (Process_Raise_Exception);
 115    --  This is the lowest level raise routine. It raises the exception
 116    --  referenced by Current_Excep.all in the TSD, without deferring abort
 117    --  (the caller must ensure that abort is deferred on entry).
 118    --
 119    --  This is the common implementation for Raise_Current_Excep and
 120    --  Raise_From_Signal_Handler. The origin of the call is indicated by the
 121    --  From_Signal_Handler argument.
 122
 123    procedure To_Stderr (S : String);
 124    pragma Export (Ada, To_Stderr, "__gnat_to_stderr");
 125    --  Little routine to output string to stderr that is also used
 126    --  in the tasking run time.
 127
 128    procedure To_Stderr (C : Character);
 129    pragma Inline (To_Stderr);
 130    pragma Export (Ada, To_Stderr, "__gnat_to_stderr_char");
 131    --  Little routine to output a character to stderr, used by some of
 132    --  the separate units below.
 133
 134    package Exception_Data is
 135
 136       ---------------------------------
 137       -- Exception messages routines --
 138       ---------------------------------
 139
 140       procedure Set_Exception_C_Msg
 141         (Id   : Exception_Id;
 142          Msg1 : Big_String_Ptr;
 143          Line : Integer        := 0;
 144          Msg2 : Big_String_Ptr := null);
 145       --  This routine is called to setup the exception referenced by the
 146       --  Current_Excep field in the TSD to contain the indicated Id value
 147       --  and message. Msg1 is a null terminated string which is generated
 148       --  as the exception message. If line is non-zero, then a colon and
 149       --  the decimal representation of this integer is appended to the
 150       --  message. When Msg2 is non-null, a space and this additional null
 151       --  terminated string is added to the message.
 152
 153       procedure Set_Exception_Msg
 154         (Id      : Exception_Id;
 155          Message : String);
 156       --  This routine is called to setup the exception referenced by the
 157       --  Current_Excep field in the TSD to contain the indicated Id value
 158       --  and message. Message is a string which is generated as the
 159       --  exception message.
 160
 161       --------------------------------------
 162       -- Exception information subprogram --
 163       --------------------------------------
 164
 165       function Exception_Information (X : Exception_Occurrence) return String;
 166       --  The format of the exception information is as follows:
 167       --
 168       --    Exception_Name: <exception name> (as in Exception_Name)
 169       --    Message: <message> (only if Exception_Message is empty)
 170       --    PID=nnnn (only if != 0)
 171       --    Call stack traceback locations:  (only if at least one location)
 172       --    <0xyyyyyyyy 0xyyyyyyyy ...>      (is recorded)
 173       --
 174       --  The lines are separated by a ASCII.LF character.
 175       --  The nnnn is the partition Id given as decimal digits.
 176       --  The 0x... line represents traceback program counter locations, in
 177       --  execution order with the first one being the exception location. It
 178       --  is present only
 179       --
 180       --  The Exception_Name and Message lines are omitted in the abort
 181       --  signal case, since this is not really an exception.
 182
 183       --  !! If the format of the generated string is changed, please note
 184       --  !! that an equivalent modification to the routine String_To_EO must
 185       --  !! be made to preserve proper functioning of the stream attributes.
 186
 187       ---------------------------------------
 188       -- Exception backtracing subprograms --
 189       ---------------------------------------
 190
 191       --  What is automatically output when exception tracing is on is the
 192       --  usual exception information with the call chain backtrace possibly
 193       --  tailored by a backtrace decorator. Modifying Exception_Information
 194       --  itself is not a good idea because the decorated output is completely
 195       --  out of control and would break all our code related to the streaming
 196       --  of exceptions.  We then provide an alternative function to compute
 197       --  the possibly tailored output, which is equivalent if no decorator is
 198       --  currently set:
 199
 200       function Tailored_Exception_Information
 201         (X : Exception_Occurrence) return String;
 202       --  Exception information to be output in the case of automatic tracing
 203       --  requested through GNAT.Exception_Traces.
 204       --
 205       --  This is the same as Exception_Information if no backtrace decorator
 206       --  is currently in place. Otherwise, this is Exception_Information with
 207       --  the call chain raw addresses replaced by the result of a call to the
 208       --  current decorator provided with the call chain addresses.
 209
 210       pragma Export
 211         (Ada, Tailored_Exception_Information,
 212            "__gnat_tailored_exception_information");
 213       --  This is currently used by System.Tasking.Stages.
 214
 215    end Exception_Data;
 216
 217    package Exception_Traces is
 218
 219       use Exception_Data;
 220       --  Imports Tailored_Exception_Information
 221
 222       ----------------------------------------------
 223       -- Run-Time Exception Notification Routines --
 224       ----------------------------------------------
 225
 226       --  These subprograms provide a common run-time interface to trigger the
 227       --  actions required when an exception is about to be propagated (e.g.
 228       --  user specified actions or output of exception information). They are
 229       --  exported to be usable by the Ada exception handling personality
 230       --  routine when the GCC 3 mechanism is used.
 231
 232       procedure Notify_Handled_Exception;
 233       pragma Export
 234         (C, Notify_Handled_Exception, "__gnat_notify_handled_exception");
 235       --  This routine is called for a handled occurrence is about to be
 236       --  propagated.
 237
 238       procedure Notify_Unhandled_Exception;
 239       pragma Export
 240         (C, Notify_Unhandled_Exception, "__gnat_notify_unhandled_exception");
 241       --  This routine is called when an unhandled occurrence is about to be
 242       --  propagated.
 243
 244       procedure Unhandled_Exception_Terminate;
 245       pragma No_Return (Unhandled_Exception_Terminate);
 246       --  This procedure is called to terminate execution following an
 247       --  unhandled exception. The exception information, including
 248       --  traceback if available is output, and execution is then
 249       --  terminated. Note that at the point where this routine is
 250       --  called, the stack has typically been destroyed.
 251
 252    end Exception_Traces;
 253
 254    package Exception_Propagation is
 255
 256       use Exception_Traces;
 257       --  Imports Notify_Unhandled_Exception and
 258       --  Unhandled_Exception_Terminate
 259
 260       ------------------------------------
 261       -- Exception propagation routines --
 262       ------------------------------------
 263
 264       procedure Setup_Exception
 265         (Excep    : EOA;
 266          Current  : EOA;
 267          Reraised : Boolean := False);
 268       --  Perform the necessary operations to prepare the propagation of Excep
 269       --  in a task where Current is the current occurrence. Excep is assumed
 270       --  to be a valid (non null) pointer.
 271       --
 272       --  This should be called before any (re-)setting of the current
 273       --  occurrence. Any such (re-)setting shall take care *not* to clobber
 274       --  the Private_Data component.
 275       --
 276       --  Having Current provided as an argument (instead of retrieving it via
 277       --  Get_Current_Excep internally) is required to allow one task to setup
 278       --  an exception for another task, which is used by Transfer_Occurrence.
 279
 280       procedure Propagate_Exception (From_Signal_Handler : Boolean);
 281       pragma No_Return (Propagate_Exception);
 282       --  This procedure propagates the exception represented by the occurrence
 283       --  referenced by Current_Excep in the TSD for the current task.
 284
 285    end Exception_Propagation;
 286
 287    package Stream_Attributes is
 288
 289       --------------------------------
 290       -- Stream attributes routines --
 291       --------------------------------
 292
 293       function EId_To_String (X : Exception_Id) return String;
 294       function String_To_EId (S : String) return Exception_Id;
 295       --  Functions for implementing Exception_Id stream attributes
 296
 297       function EO_To_String (X : Exception_Occurrence) return String;
 298       function String_To_EO (S : String) return Exception_Occurrence;
 299       --  Functions for implementing Exception_Occurrence stream
 300       --  attributes
 301
 302    end Stream_Attributes;
 303
 304    procedure Raise_Current_Excep (E : Exception_Id);
 305    pragma No_Return (Raise_Current_Excep);
 306    pragma Export (C, Raise_Current_Excep, "__gnat_raise_nodefer_with_msg");
 307    --  This is a simple wrapper to Process_Raise_Exception setting the
 308    --  From_Signal_Handler argument to False.
 309    --
 310    --  This external name for Raise_Current_Excep is historical, and probably
 311    --  should be changed but for now we keep it, because gdb and gigi know
 312    --  about it.
 313
 314    procedure Raise_Exception_No_Defer
 315       (E : Exception_Id; Message : String := "");
 316    pragma Export
 317     (Ada, Raise_Exception_No_Defer,
 318      "ada__exceptions__raise_exception_no_defer");
 319    pragma No_Return (Raise_Exception_No_Defer);
 320    --  Similar to Raise_Exception, but with no abort deferral
 321
 322    procedure Raise_With_Msg (E : Exception_Id);
 323    pragma No_Return (Raise_With_Msg);
 324    pragma Export (C, Raise_With_Msg, "__gnat_raise_with_msg");
 325    --  Raises an exception with given exception id value. A message
 326    --  is associated with the raise, and has already been stored in the
 327    --  exception occurrence referenced by the Current_Excep in the TSD.
 328    --  Abort is deferred before the raise call.
 329
 330    procedure Raise_With_Location_And_Msg
 331      (E : Exception_Id;
 332       F : Big_String_Ptr;
 333       L : Integer;
 334       M : Big_String_Ptr := null);
 335    pragma No_Return (Raise_With_Location_And_Msg);
 336    --  Raise an exception with given exception id value. A filename and line
 337    --  number is associated with the raise and is stored in the exception
 338    --  occurrence and in addition a string message M is appended to
 339    --  this (if M is not null).
 340
 341    procedure Raise_Constraint_Error
 342      (File : Big_String_Ptr;
 343       Line : Integer);
 344    pragma No_Return (Raise_Constraint_Error);
 345    pragma Export
 346      (C, Raise_Constraint_Error, "__gnat_raise_constraint_error");
 347    --  Raise constraint error with file:line information
 348
 349    procedure Raise_Constraint_Error_Msg
 350      (File : Big_String_Ptr;
 351       Line : Integer;
 352       Msg  : Big_String_Ptr);
 353    pragma No_Return (Raise_Constraint_Error_Msg);
 354    pragma Export
 355      (C, Raise_Constraint_Error_Msg, "__gnat_raise_constraint_error_msg");
 356    --  Raise constraint error with file:line + msg information
 357
 358    procedure Raise_Program_Error
 359      (File : Big_String_Ptr;
 360       Line : Integer);
 361    pragma No_Return (Raise_Program_Error);
 362    pragma Export
 363      (C, Raise_Program_Error, "__gnat_raise_program_error");
 364    --  Raise program error with file:line information
 365
 366    procedure Raise_Program_Error_Msg
 367      (File : Big_String_Ptr;
 368       Line : Integer;
 369       Msg  : Big_String_Ptr);
 370    pragma No_Return (Raise_Program_Error_Msg);
 371    pragma Export
 372      (C, Raise_Program_Error_Msg, "__gnat_raise_program_error_msg");
 373    --  Raise program error with file:line + msg information
 374
 375    procedure Raise_Storage_Error
 376      (File : Big_String_Ptr;
 377       Line : Integer);
 378    pragma No_Return (Raise_Storage_Error);
 379    pragma Export
 380      (C, Raise_Storage_Error, "__gnat_raise_storage_error");
 381    --  Raise storage error with file:line information
 382
 383    procedure Raise_Storage_Error_Msg
 384      (File : Big_String_Ptr;
 385       Line : Integer;
 386       Msg  : Big_String_Ptr);
 387    pragma No_Return (Raise_Storage_Error_Msg);
 388    pragma Export
 389      (C, Raise_Storage_Error_Msg, "__gnat_raise_storage_error_msg");
 390    --  Raise storage error with file:line + reason msg information
 391
 392    --  The exception raising process and the automatic tracing mechanism rely
 393    --  on some careful use of flags attached to the exception occurrence. The
 394    --  graph below illustrates the relations between the Raise_ subprograms
 395    --  and identifies the points where basic flags such as Exception_Raised
 396    --  are initialized.
 397    --
 398    --  (i) signs indicate the flags initialization points. R stands for Raise,
 399    --  W for With, and E for Exception.
 400    --
 401    --                   R_No_Msg    R_E   R_Pe  R_Ce  R_Se
 402    --                       |        |     |     |     |
 403    --                       +--+  +--+     +---+ | +---+
 404    --                          |  |            | | |
 405    --     R_E_No_Defer(i)    R_W_Msg(i)       R_W_Loc
 406    --           |               |              |   |
 407    --           +------------+  |  +-----------+   +--+
 408    --                        |  |  |                  |
 409    --                        |  |  |             Set_E_C_Msg(i)
 410    --                        |  |  |
 411    --                   Raise_Current_Excep
 412
 413    procedure Reraise;
 414    pragma No_Return (Reraise);
 415    pragma Export (C, Reraise, "__gnat_reraise");
 416    --  Reraises the exception referenced by the Current_Excep field of
 417    --  the TSD (all fields of this exception occurrence are set). Abort
 418    --  is deferred before the reraise operation.
 419
 420    --  Save_Occurrence variations: As the management of the private data
 421    --  attached to occurrences is delicate, wether or not pointers to such
 422    --  data has to be copied in various situations is better made explicit.
 423    --  The following procedures provide an internal interface to help making
 424    --  this explicit.
 425
 426    procedure Save_Occurrence_And_Private
 427      (Target : out Exception_Occurrence;
 428       Source : Exception_Occurrence);
 429    --  Copy all the components of Source to Target as well as the
 430    --  Private_Data pointer.
 431
 432    procedure Save_Occurrence_No_Private
 433      (Target : out Exception_Occurrence;
 434       Source : Exception_Occurrence);
 435    --  Copy all the components of Source to Target, except the
 436    --  Private_Data pointer.
 437
 438    procedure Transfer_Occurrence
 439      (Target : Exception_Occurrence_Access;
 440       Source : Exception_Occurrence);
 441    pragma Export (C, Transfer_Occurrence, "__gnat_transfer_occurrence");
 442    --  Called from System.Tasking.RendezVous.Exceptional_Complete_RendezVous
 443    --  to setup Target from Source as an exception to be propagated in the
 444    --  caller task. Target is expected to be a pointer to the fixed TSD
 445    --  occurrence for this task.
 446
 447    -----------------------------
 448    -- Run-Time Check Routines --
 449    -----------------------------
 450
 451    --  These routines are called from the runtime to raise a specific
 452    --  exception with a reason message attached. The parameters are
 453    --  the file name and line number in each case. The names are keyed
 454    --  to the codes defined in Types.ads and a-types.h (for example,
 455    --  the name Rcheck_05 refers to the Reason whose Pos code is 5).
 456
 457    procedure Rcheck_00 (File : Big_String_Ptr; Line : Integer);
 458    procedure Rcheck_01 (File : Big_String_Ptr; Line : Integer);
 459    procedure Rcheck_02 (File : Big_String_Ptr; Line : Integer);
 460    procedure Rcheck_03 (File : Big_String_Ptr; Line : Integer);
 461    procedure Rcheck_04 (File : Big_String_Ptr; Line : Integer);
 462    procedure Rcheck_05 (File : Big_String_Ptr; Line : Integer);
 463    procedure Rcheck_06 (File : Big_String_Ptr; Line : Integer);
 464    procedure Rcheck_07 (File : Big_String_Ptr; Line : Integer);
 465    procedure Rcheck_08 (File : Big_String_Ptr; Line : Integer);
 466    procedure Rcheck_09 (File : Big_String_Ptr; Line : Integer);
 467    procedure Rcheck_10 (File : Big_String_Ptr; Line : Integer);
 468    procedure Rcheck_11 (File : Big_String_Ptr; Line : Integer);
 469    procedure Rcheck_12 (File : Big_String_Ptr; Line : Integer);
 470    procedure Rcheck_13 (File : Big_String_Ptr; Line : Integer);
 471    procedure Rcheck_14 (File : Big_String_Ptr; Line : Integer);
 472    procedure Rcheck_15 (File : Big_String_Ptr; Line : Integer);
 473    procedure Rcheck_16 (File : Big_String_Ptr; Line : Integer);
 474    procedure Rcheck_17 (File : Big_String_Ptr; Line : Integer);
 475    procedure Rcheck_18 (File : Big_String_Ptr; Line : Integer);
 476    procedure Rcheck_19 (File : Big_String_Ptr; Line : Integer);
 477    procedure Rcheck_20 (File : Big_String_Ptr; Line : Integer);
 478    procedure Rcheck_21 (File : Big_String_Ptr; Line : Integer);
 479    procedure Rcheck_22 (File : Big_String_Ptr; Line : Integer);
 480    procedure Rcheck_23 (File : Big_String_Ptr; Line : Integer);
 481    procedure Rcheck_24 (File : Big_String_Ptr; Line : Integer);
 482    procedure Rcheck_25 (File : Big_String_Ptr; Line : Integer);
 483    procedure Rcheck_26 (File : Big_String_Ptr; Line : Integer);
 484    procedure Rcheck_27 (File : Big_String_Ptr; Line : Integer);
 485    procedure Rcheck_28 (File : Big_String_Ptr; Line : Integer);
 486    procedure Rcheck_29 (File : Big_String_Ptr; Line : Integer);
 487
 488    pragma Export (C, Rcheck_00, "__gnat_rcheck_00");
 489    pragma Export (C, Rcheck_01, "__gnat_rcheck_01");
 490    pragma Export (C, Rcheck_02, "__gnat_rcheck_02");
 491    pragma Export (C, Rcheck_03, "__gnat_rcheck_03");
 492    pragma Export (C, Rcheck_04, "__gnat_rcheck_04");
 493    pragma Export (C, Rcheck_05, "__gnat_rcheck_05");
 494    pragma Export (C, Rcheck_06, "__gnat_rcheck_06");
 495    pragma Export (C, Rcheck_07, "__gnat_rcheck_07");
 496    pragma Export (C, Rcheck_08, "__gnat_rcheck_08");
 497    pragma Export (C, Rcheck_09, "__gnat_rcheck_09");
 498    pragma Export (C, Rcheck_10, "__gnat_rcheck_10");
 499    pragma Export (C, Rcheck_11, "__gnat_rcheck_11");
 500    pragma Export (C, Rcheck_12, "__gnat_rcheck_12");
 501    pragma Export (C, Rcheck_13, "__gnat_rcheck_13");
 502    pragma Export (C, Rcheck_14, "__gnat_rcheck_14");
 503    pragma Export (C, Rcheck_15, "__gnat_rcheck_15");
 504    pragma Export (C, Rcheck_16, "__gnat_rcheck_16");
 505    pragma Export (C, Rcheck_17, "__gnat_rcheck_17");
 506    pragma Export (C, Rcheck_18, "__gnat_rcheck_18");
 507    pragma Export (C, Rcheck_19, "__gnat_rcheck_19");
 508    pragma Export (C, Rcheck_20, "__gnat_rcheck_20");
 509    pragma Export (C, Rcheck_21, "__gnat_rcheck_21");
 510    pragma Export (C, Rcheck_22, "__gnat_rcheck_22");
 511    pragma Export (C, Rcheck_23, "__gnat_rcheck_23");
 512    pragma Export (C, Rcheck_24, "__gnat_rcheck_24");
 513    pragma Export (C, Rcheck_25, "__gnat_rcheck_25");
 514    pragma Export (C, Rcheck_26, "__gnat_rcheck_26");
 515    pragma Export (C, Rcheck_27, "__gnat_rcheck_27");
 516    pragma Export (C, Rcheck_28, "__gnat_rcheck_28");
 517    pragma Export (C, Rcheck_29, "__gnat_rcheck_29");
 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
 554    ---------------------------------------------
 555    -- Reason Strings for Run-Time Check Calls --
 556    ---------------------------------------------
 557
 558    --  These strings are null-terminated and are used by Rcheck_nn. The
 559    --  strings correspond to the definitions for Types.RT_Exception_Code.
 560
 561    use ASCII;
 562
 563    Rmsg_00 : constant String := "access check failed"              & NUL;
 564    Rmsg_01 : constant String := "access parameter is null"         & NUL;
 565    Rmsg_02 : constant String := "discriminant check failed"        & NUL;
 566    Rmsg_03 : constant String := "divide by zero"                   & NUL;
 567    Rmsg_04 : constant String := "explicit raise"                   & NUL;
 568    Rmsg_05 : constant String := "index check failed"               & NUL;
 569    Rmsg_06 : constant String := "invalid data"                     & NUL;
 570    Rmsg_07 : constant String := "length check failed"              & NUL;
 571    Rmsg_08 : constant String := "overflow check failed"            & NUL;
 572    Rmsg_09 : constant String := "partition check failed"           & NUL;
 573    Rmsg_10 : constant String := "range check failed"               & NUL;
 574    Rmsg_11 : constant String := "tag check failed"                 & NUL;
 575    Rmsg_12 : constant String := "access before elaboration"        & NUL;
 576    Rmsg_13 : constant String := "accessibility check failed"       & NUL;
 577    Rmsg_14 : constant String := "all guards closed"                & NUL;
 578    Rmsg_15 : constant String := "duplicated entry address"         & NUL;
 579    Rmsg_16 : constant String := "explicit raise"                   & NUL;
 580    Rmsg_17 : constant String := "finalize/adjust raised exception" & NUL;
 581    Rmsg_18 : constant String := "misaligned address value"         & NUL;
 582    Rmsg_19 : constant String := "missing return"                   & NUL;
 583    Rmsg_20 : constant String := "overlaid controlled object"       & NUL;
 584    Rmsg_21 : constant String := "potentially blocking operation"   & NUL;
 585    Rmsg_22 : constant String := "stubbed subprogram called"        & NUL;
 586    Rmsg_23 : constant String := "unchecked union restriction"      & NUL;
 587    Rmsg_24 : constant String := "illegal use of"
 588              & " remote access-to-class-wide type, see RM E.4(18)" & NUL;
 589    Rmsg_25 : constant String := "empty storage pool"               & NUL;
 590    Rmsg_26 : constant String := "explicit raise"                   & NUL;
 591    Rmsg_27 : constant String := "infinite recursion"               & NUL;
 592    Rmsg_28 : constant String := "object too large"                 & NUL;
 593    Rmsg_29 : constant String := "restriction violation"            & NUL;
 594
 595    -----------------------
 596    -- Polling Interface --
 597    -----------------------
 598
 599    type Unsigned is mod 2 ** 32;
 600
 601    Counter : Unsigned := 0;
 602    pragma Warnings (Off, Counter);
 603    --  This counter is provided for convenience. It can be used in Poll to
 604    --  perform periodic but not systematic operations.
 605
 606    procedure Poll is separate;
 607    --  The actual polling routine is separate, so that it can easily
 608    --  be replaced with a target dependent version.
 609
 610    ---------
 611    -- AAA --
 612    ---------
 613
 614    --  This dummy procedure gives us the start of the PC range for addresses
 615    --  within the exception unit itself. We hope that gigi/gcc keep all the
 616    --  procedures in their original order!
 617
 618    procedure AAA is
 619    begin
 620       <<Start_Of_AAA>>
 621       Code_Address_For_AAA := Start_Of_AAA'Address;
 622    end AAA;
 623
 624    ----------------
 625    -- Call_Chain --
 626    ----------------
 627
 628    procedure Call_Chain (Excep : EOA) is separate;
 629    --  The actual Call_Chain routine is separate, so that it can easily
 630    --  be dummied out when no exception traceback information is needed.
 631
 632    ------------------------------
 633    -- Current_Target_Exception --
 634    ------------------------------
 635
 636    function Current_Target_Exception return Exception_Occurrence is
 637    begin
 638       return Null_Occurrence;
 639    end Current_Target_Exception;
 640
 641    -------------------
 642    -- EId_To_String --
 643    -------------------
 644
 645    function EId_To_String (X : Exception_Id) return String
 646      renames Stream_Attributes.EId_To_String;
 647
 648    ------------------
 649    -- EO_To_String --
 650    ------------------
 651
 652    --  We use the null string to represent the null occurrence, otherwise
 653    --  we output the Exception_Information string for the occurrence.
 654
 655    function EO_To_String (X : Exception_Occurrence) return String
 656      renames Stream_Attributes.EO_To_String;
 657
 658    ------------------------
 659    -- Exception_Identity --
 660    ------------------------
 661
 662    function Exception_Identity
 663      (X    : Exception_Occurrence)
 664       return Exception_Id
 665    is
 666    begin
 667       if X.Id = Null_Id then
 668          raise Constraint_Error;
 669       else
 670          return X.Id;
 671       end if;
 672    end Exception_Identity;
 673
 674    ---------------------------
 675    -- Exception_Information --
 676    ---------------------------
 677
 678    function Exception_Information (X : Exception_Occurrence) return String is
 679    begin
 680       if X.Id = Null_Id then
 681          raise Constraint_Error;
 682       end if;
 683
 684       return Exception_Data.Exception_Information (X);
 685    end Exception_Information;
 686
 687    -----------------------
 688    -- Exception_Message --
 689    -----------------------
 690
 691    function Exception_Message (X : Exception_Occurrence) return String is
 692    begin
 693       if X.Id = Null_Id then
 694          raise Constraint_Error;
 695       end if;
 696
 697       return X.Msg (1 .. X.Msg_Length);
 698    end Exception_Message;
 699
 700    --------------------
 701    -- Exception_Name --
 702    --------------------
 703
 704    function Exception_Name (Id : Exception_Id) return String is
 705    begin
 706       if Id = null then
 707          raise Constraint_Error;
 708       end if;
 709
 710       return Id.Full_Name.all (1 .. Id.Name_Length - 1);
 711    end Exception_Name;
 712
 713    function Exception_Name (X : Exception_Occurrence) return String is
 714    begin
 715       return Exception_Name (X.Id);
 716    end Exception_Name;
 717
 718    ---------------------------
 719    -- Exception_Name_Simple --
 720    ---------------------------
 721
 722    function Exception_Name_Simple (X : Exception_Occurrence) return String is
 723       Name : constant String := Exception_Name (X);
 724       P    : Natural;
 725
 726    begin
 727       P := Name'Length;
 728       while P > 1 loop
 729          exit when Name (P - 1) = '.';
 730          P := P - 1;
 731       end loop;
 732
 733       --  Return result making sure lower bound is 1
 734
 735       declare
 736          subtype Rname is String (1 .. Name'Length - P + 1);
 737       begin
 738          return Rname (Name (P .. Name'Length));
 739       end;
 740    end Exception_Name_Simple;
 741
 742    --------------------
 743    -- Exception_Data --
 744    --------------------
 745
 746    package body Exception_Data is separate;
 747    --  This package can be easily dummied out if we do not want the
 748    --  basic support for exception messages (such as in Ada 83).
 749
 750    ---------------------------
 751    -- Exception_Propagation --
 752    ---------------------------
 753
 754    package body Exception_Propagation is separate;
 755    --  Depending on the actual exception mechanism used (front-end or
 756    --  back-end based), the implementation will differ, which is why this
 757    --  package is separated.
 758
 759    ----------------------
 760    -- Exception_Traces --
 761    ----------------------
 762
 763    package body Exception_Traces is separate;
 764    --  Depending on the underlying support for IO the implementation
 765    --  will differ. Moreover we would like to dummy out this package
 766    --  in case we do not want any exception tracing support. This is
 767    --  why this package is separated.
 768
 769    -----------------------
 770    -- Stream Attributes --
 771    -----------------------
 772
 773    package body Stream_Attributes is separate;
 774    --  This package can be easily dummied out if we do not want the
 775    --  support for streaming Exception_Ids and Exception_Occurrences.
 776
 777    -----------------------------
 778    -- Process_Raise_Exception --
 779    -----------------------------
 780
 781    procedure Process_Raise_Exception
 782      (E                   : Exception_Id;
 783       From_Signal_Handler : Boolean)
 784    is
 785       pragma Inspection_Point (E);
 786       --  This is so the debugger can reliably inspect the parameter
 787
 788       Jumpbuf_Ptr : constant Address := Get_Jmpbuf_Address.all;
 789       Excep       : EOA := Get_Current_Excep.all;
 790
 791    begin
 792       --  WARNING : There should be no exception handler for this body
 793       --  because this would cause gigi to prepend a setup for a new
 794       --  jmpbuf to the sequence of statements. We would then always get
 795       --  this new buf in Jumpbuf_Ptr instead of the one for the exception
 796       --  we are handling, which would completely break the whole design
 797       --  of this procedure.
 798
 799       --  Processing varies between zero cost and setjmp/lonjmp processing.
 800
 801       if Zero_Cost_Exceptions /= 0 then
 802
 803          --  Use the front-end tables to propagate if we have them, otherwise
 804          --  resort to the GCC back-end alternative. Backtrace computation is
 805          --  performed, if required, by the underlying routine. Notifications
 806          --  for the debugger are also not performed here, because we do not
 807          --  yet know if the exception is handled.
 808
 809          Exception_Propagation.Propagate_Exception (From_Signal_Handler);
 810
 811       else
 812          --  Compute the backtrace for this occurrence if the corresponding
 813          --  binder option has been set. Call_Chain takes care of the reraise
 814          --  case.
 815
 816          Call_Chain (Excep);
 817          --  We used to only do this if From_Signal_Handler was not set,
 818          --  based on the assumption that backtracing from a signal handler
 819          --  would not work due to stack layout oddities. However, since
 820          --
 821          --   1. The flag is never set in tasking programs (Notify_Exception
 822          --      performs regular raise statements), and
 823          --
 824          --   2. No problem has shown up in tasking programs around here so
 825          --      far, this turned out to be too strong an assumption.
 826          --
 827          --  As, in addition, the test was
 828          --
 829          --   1. preventing the production of backtraces in non-tasking
 830          --      programs, and
 831          --
 832          --   2. introducing a behavior inconsistency between
 833          --      the tasking and non-tasking cases,
 834          --
 835          --  we have simply removed it.
 836
 837          --  If the jump buffer pointer is non-null, transfer control using
 838          --  it. Otherwise announce an unhandled exception (note that this
 839          --  means that we have no finalizations to do other than at the outer
 840          --  level). Perform the necessary notification tasks in both cases.
 841
 842          if Jumpbuf_Ptr /= Null_Address then
 843
 844             if not Excep.Exception_Raised then
 845                Excep.Exception_Raised := True;
 846                Exception_Traces.Notify_Handled_Exception;
 847             end if;
 848
 849             builtin_longjmp (Jumpbuf_Ptr, 1);
 850
 851          else
 852             --  The pragma Inspection point here ensures that the debugger
 853             --  can inspect the parameter.
 854
 855             pragma Inspection_Point (E);
 856
 857             Exception_Traces.Notify_Unhandled_Exception;
 858             Exception_Traces.Unhandled_Exception_Terminate;
 859          end if;
 860       end if;
 861    end Process_Raise_Exception;
 862
 863    ----------------------------
 864    -- Raise_Constraint_Error --
 865    ----------------------------
 866
 867    procedure Raise_Constraint_Error
 868      (File : Big_String_Ptr;
 869       Line : Integer)
 870    is
 871    begin
 872       Raise_With_Location_And_Msg
 873         (Constraint_Error_Def'Access, File, Line);
 874    end Raise_Constraint_Error;
 875
 876    --------------------------------
 877    -- Raise_Constraint_Error_Msg --
 878    --------------------------------
 879
 880    procedure Raise_Constraint_Error_Msg
 881      (File : Big_String_Ptr;
 882       Line : Integer;
 883       Msg  : Big_String_Ptr)
 884    is
 885    begin
 886       Raise_With_Location_And_Msg
 887         (Constraint_Error_Def'Access, File, Line, Msg);
 888    end Raise_Constraint_Error_Msg;
 889
 890    -------------------------
 891    -- Raise_Current_Excep --
 892    -------------------------
 893
 894    procedure Raise_Current_Excep (E : Exception_Id) is
 895       pragma Inspection_Point (E);
 896       --  This is so the debugger can reliably inspect the parameter
 897    begin
 898       Process_Raise_Exception (E => E, From_Signal_Handler => False);
 899    end Raise_Current_Excep;
 900
 901    ---------------------
 902    -- Raise_Exception --
 903    ---------------------
 904
 905    procedure Raise_Exception
 906      (E       : Exception_Id;
 907       Message : String := "")
 908    is
 909    begin
 910       if E /= null then
 911          Exception_Data.Set_Exception_Msg (E, Message);
 912          Abort_Defer.all;
 913          Raise_Current_Excep (E);
 914       end if;
 915    end Raise_Exception;
 916
 917    ----------------------------
 918    -- Raise_Exception_Always --
 919    ----------------------------
 920
 921    procedure Raise_Exception_Always
 922      (E       : Exception_Id;
 923       Message : String := "")
 924    is
 925    begin
 926       Exception_Data.Set_Exception_Msg (E, Message);
 927       Abort_Defer.all;
 928       Raise_Current_Excep (E);
 929    end Raise_Exception_Always;
 930
 931    -------------------------------
 932    -- Raise_From_Signal_Handler --
 933    -------------------------------
 934
 935    procedure Raise_From_Signal_Handler
 936      (E : Exception_Id;
 937       M : Big_String_Ptr)
 938    is
 939    begin
 940       Exception_Data.Set_Exception_C_Msg (E, M);
 941       Abort_Defer.all;
 942       Process_Raise_Exception (E => E, From_Signal_Handler => True);
 943    end Raise_From_Signal_Handler;
 944
 945    -------------------------
 946    -- Raise_Program_Error --
 947    -------------------------
 948
 949    procedure Raise_Program_Error
 950      (File : Big_String_Ptr;
 951       Line : Integer)
 952    is
 953    begin
 954       Raise_With_Location_And_Msg
 955         (Program_Error_Def'Access, File, Line);
 956    end Raise_Program_Error;
 957
 958    -----------------------------
 959    -- Raise_Program_Error_Msg --
 960    -----------------------------
 961
 962    procedure Raise_Program_Error_Msg
 963      (File : Big_String_Ptr;
 964       Line : Integer;
 965       Msg  : Big_String_Ptr)
 966    is
 967    begin
 968       Raise_With_Location_And_Msg
 969         (Program_Error_Def'Access, File, Line, Msg);
 970    end Raise_Program_Error_Msg;
 971
 972    -------------------------
 973    -- Raise_Storage_Error --
 974    -------------------------
 975
 976    procedure Raise_Storage_Error
 977      (File : Big_String_Ptr;
 978       Line : Integer)
 979    is
 980    begin
 981       Raise_With_Location_And_Msg
 982         (Storage_Error_Def'Access, File, Line);
 983    end Raise_Storage_Error;
 984
 985    -----------------------------
 986    -- Raise_Storage_Error_Msg --
 987    -----------------------------
 988
 989    procedure Raise_Storage_Error_Msg
 990      (File : Big_String_Ptr;
 991       Line : Integer;
 992       Msg  : Big_String_Ptr)
 993    is
 994    begin
 995       Raise_With_Location_And_Msg
 996         (Storage_Error_Def'Access, File, Line, Msg);
 997    end Raise_Storage_Error_Msg;
 998
 999    ---------------------------------
1000    -- Raise_With_Location_And_Msg --
1001    ---------------------------------
1002
1003    procedure Raise_With_Location_And_Msg
1004      (E : Exception_Id;
1005       F : Big_String_Ptr;
1006       L : Integer;
1007       M : Big_String_Ptr := null)
1008    is
1009    begin
1010       Exception_Data.Set_Exception_C_Msg (E, F, L, M);
1011       Abort_Defer.all;
1012       Raise_Current_Excep (E);
1013    end Raise_With_Location_And_Msg;
1014
1015    --------------------
1016    -- Raise_With_Msg --
1017    --------------------
1018
1019    procedure Raise_With_Msg (E : Exception_Id) is
1020       Excep : constant EOA := Get_Current_Excep.all;
1021
1022    begin
1023       Exception_Propagation.Setup_Exception (Excep, Excep);
1024
1025       Excep.Exception_Raised := False;
1026       Excep.Id               := E;
1027       Excep.Num_Tracebacks   := 0;
1028       Excep.Cleanup_Flag     := False;
1029       Excep.Pid              := Local_Partition_ID;
1030       Abort_Defer.all;
1031       Raise_Current_Excep (E);
1032    end Raise_With_Msg;
1033
1034    --------------------------------------
1035    -- Calls to Run-Time Check Routines --
1036    --------------------------------------
1037
1038    procedure Rcheck_00 (File : Big_String_Ptr; Line : Integer) is
1039    begin
1040       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_00'Address));
1041    end Rcheck_00;
1042
1043    procedure Rcheck_01 (File : Big_String_Ptr; Line : Integer) is
1044    begin
1045       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_01'Address));
1046    end Rcheck_01;
1047
1048    procedure Rcheck_02 (File : Big_String_Ptr; Line : Integer) is
1049    begin
1050       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_02'Address));
1051    end Rcheck_02;
1052
1053    procedure Rcheck_03 (File : Big_String_Ptr; Line : Integer) is
1054    begin
1055       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_03'Address));
1056    end Rcheck_03;
1057
1058    procedure Rcheck_04 (File : Big_String_Ptr; Line : Integer) is
1059    begin
1060       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_04'Address));
1061    end Rcheck_04;
1062
1063    procedure Rcheck_05 (File : Big_String_Ptr; Line : Integer) is
1064    begin
1065       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_05'Address));
1066    end Rcheck_05;
1067
1068    procedure Rcheck_06 (File : Big_String_Ptr; Line : Integer) is
1069    begin
1070       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_06'Address));
1071    end Rcheck_06;
1072
1073    procedure Rcheck_07 (File : Big_String_Ptr; Line : Integer) is
1074    begin
1075       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_07'Address));
1076    end Rcheck_07;
1077
1078    procedure Rcheck_08 (File : Big_String_Ptr; Line : Integer) is
1079    begin
1080       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_08'Address));
1081    end Rcheck_08;
1082
1083    procedure Rcheck_09 (File : Big_String_Ptr; Line : Integer) is
1084    begin
1085       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_09'Address));
1086    end Rcheck_09;
1087
1088    procedure Rcheck_10 (File : Big_String_Ptr; Line : Integer) is
1089    begin
1090       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_10'Address));
1091    end Rcheck_10;
1092
1093    procedure Rcheck_11 (File : Big_String_Ptr; Line : Integer) is
1094    begin
1095       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_11'Address));
1096    end Rcheck_11;
1097
1098    procedure Rcheck_12 (File : Big_String_Ptr; Line : Integer) is
1099    begin
1100       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_12'Address));
1101    end Rcheck_12;
1102
1103    procedure Rcheck_13 (File : Big_String_Ptr; Line : Integer) is
1104    begin
1105       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_13'Address));
1106    end Rcheck_13;
1107
1108    procedure Rcheck_14 (File : Big_String_Ptr; Line : Integer) is
1109    begin
1110       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_14'Address));
1111    end Rcheck_14;
1112
1113    procedure Rcheck_15 (File : Big_String_Ptr; Line : Integer) is
1114    begin
1115       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_15'Address));
1116    end Rcheck_15;
1117
1118    procedure Rcheck_16 (File : Big_String_Ptr; Line : Integer) is
1119    begin
1120       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_16'Address));
1121    end Rcheck_16;
1122
1123    procedure Rcheck_17 (File : Big_String_Ptr; Line : Integer) is
1124    begin
1125       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_17'Address));
1126    end Rcheck_17;
1127
1128    procedure Rcheck_18 (File : Big_String_Ptr; Line : Integer) is
1129    begin
1130       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_18'Address));
1131    end Rcheck_18;
1132
1133    procedure Rcheck_19 (File : Big_String_Ptr; Line : Integer) is
1134    begin
1135       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_19'Address));
1136    end Rcheck_19;
1137
1138    procedure Rcheck_20 (File : Big_String_Ptr; Line : Integer) is
1139    begin
1140       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_20'Address));
1141    end Rcheck_20;
1142
1143    procedure Rcheck_21 (File : Big_String_Ptr; Line : Integer) is
1144    begin
1145       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_21'Address));
1146    end Rcheck_21;
1147
1148    procedure Rcheck_22 (File : Big_String_Ptr; Line : Integer) is
1149    begin
1150       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_22'Address));
1151    end Rcheck_22;
1152
1153    procedure Rcheck_23 (File : Big_String_Ptr; Line : Integer) is
1154    begin
1155       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_23'Address));
1156    end Rcheck_23;
1157
1158    procedure Rcheck_24 (File : Big_String_Ptr; Line : Integer) is
1159    begin
1160       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_24'Address));
1161    end Rcheck_24;
1162
1163    procedure Rcheck_25 (File : Big_String_Ptr; Line : Integer) is
1164    begin
1165       Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_25'Address));
1166    end Rcheck_25;
1167
1168    procedure Rcheck_26 (File : Big_String_Ptr; Line : Integer) is
1169    begin
1170       Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_26'Address));
1171    end Rcheck_26;
1172
1173    procedure Rcheck_27 (File : Big_String_Ptr; Line : Integer) is
1174    begin
1175       Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_27'Address));
1176    end Rcheck_27;
1177
1178    procedure Rcheck_28 (File : Big_String_Ptr; Line : Integer) is
1179    begin
1180       Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_28'Address));
1181    end Rcheck_28;
1182
1183    procedure Rcheck_29 (File : Big_String_Ptr; Line : Integer) is
1184    begin
1185       Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_29'Address));
1186    end Rcheck_29;
1187
1188    -------------
1189    -- Reraise --
1190    -------------
1191
1192    procedure Reraise is
1193       Excep : constant EOA := Get_Current_Excep.all;
1194
1195    begin
1196       Abort_Defer.all;
1197       Exception_Propagation.Setup_Exception (Excep, Excep, Reraised => True);
1198       Raise_Current_Excep (Excep.Id);
1199    end Reraise;
1200
1201    ------------------------
1202    -- Reraise_Occurrence --
1203    ------------------------
1204
1205    procedure Reraise_Occurrence (X : Exception_Occurrence) is
1206    begin
1207       if X.Id /= null then
1208          Abort_Defer.all;
1209          Exception_Propagation.Setup_Exception
1210            (X'Unrestricted_Access, Get_Current_Excep.all, Reraised => True);
1211          Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1212          Raise_Current_Excep (X.Id);
1213       end if;
1214    end Reraise_Occurrence;
1215
1216    -------------------------------
1217    -- Reraise_Occurrence_Always --
1218    -------------------------------
1219
1220    procedure Reraise_Occurrence_Always (X : Exception_Occurrence) is
1221    begin
1222       Abort_Defer.all;
1223       Exception_Propagation.Setup_Exception
1224         (X'Unrestricted_Access, Get_Current_Excep.all, Reraised => True);
1225       Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1226       Raise_Current_Excep (X.Id);
1227    end Reraise_Occurrence_Always;
1228
1229    ---------------------------------
1230    -- Reraise_Occurrence_No_Defer --
1231    ---------------------------------
1232
1233    procedure Reraise_Occurrence_No_Defer (X : Exception_Occurrence) is
1234    begin
1235       Exception_Propagation.Setup_Exception
1236         (X'Unrestricted_Access, Get_Current_Excep.all, Reraised => True);
1237       Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1238       Raise_Current_Excep (X.Id);
1239    end Reraise_Occurrence_No_Defer;
1240
1241    ---------------------
1242    -- Save_Occurrence --
1243    ---------------------
1244
1245    procedure Save_Occurrence
1246      (Target : out Exception_Occurrence;
1247       Source : Exception_Occurrence)
1248    is
1249    begin
1250       Save_Occurrence_No_Private (Target, Source);
1251    end Save_Occurrence;
1252
1253    function Save_Occurrence
1254      (Source : Exception_Occurrence)
1255       return   EOA
1256    is
1257       Target : EOA := new Exception_Occurrence;
1258
1259    begin
1260       Save_Occurrence (Target.all, Source);
1261       return Target;
1262    end Save_Occurrence;
1263
1264    --------------------------------
1265    -- Save_Occurrence_And_Private --
1266    --------------------------------
1267
1268    procedure Save_Occurrence_And_Private
1269      (Target : out Exception_Occurrence;
1270       Source : Exception_Occurrence)
1271    is
1272    begin
1273       Save_Occurrence_No_Private (Target, Source);
1274       Target.Private_Data := Source.Private_Data;
1275    end Save_Occurrence_And_Private;
1276
1277    --------------------------------
1278    -- Save_Occurrence_No_Private --
1279    --------------------------------
1280
1281    procedure Save_Occurrence_No_Private
1282      (Target : out Exception_Occurrence;
1283       Source : Exception_Occurrence)
1284    is
1285    begin
1286       Target.Id             := Source.Id;
1287       Target.Msg_Length     := Source.Msg_Length;
1288       Target.Num_Tracebacks := Source.Num_Tracebacks;
1289       Target.Pid            := Source.Pid;
1290       Target.Cleanup_Flag   := Source.Cleanup_Flag;
1291
1292       Target.Msg (1 .. Target.Msg_Length) :=
1293         Source.Msg (1 .. Target.Msg_Length);
1294
1295       Target.Tracebacks (1 .. Target.Num_Tracebacks) :=
1296         Source.Tracebacks (1 .. Target.Num_Tracebacks);
1297    end Save_Occurrence_No_Private;
1298
1299    -------------------------
1300    -- Transfer_Occurrence --
1301    -------------------------
1302
1303    procedure Transfer_Occurrence
1304      (Target : Exception_Occurrence_Access;
1305       Source : Exception_Occurrence)
1306    is
1307    begin
1308       --  Setup Target as an exception to be propagated in the calling task
1309       --  (rendezvous-wise), taking care not to clobber the associated private
1310       --  data.  Target is expected to be a pointer to the calling task's
1311       --  fixed TSD occurrence, which is very different from Get_Current_Excep
1312       --  here because this subprogram is called from the called task.
1313
1314       Exception_Propagation.Setup_Exception (Target, Target);
1315       Save_Occurrence_No_Private (Target.all, Source);
1316    end Transfer_Occurrence;
1317
1318    -------------------
1319    -- String_To_EId --
1320    -------------------
1321
1322    function String_To_EId (S : String) return Exception_Id
1323      renames Stream_Attributes.String_To_EId;
1324
1325    ------------------
1326    -- String_To_EO --
1327    ------------------
1328
1329    function String_To_EO (S : String) return Exception_Occurrence
1330      renames Stream_Attributes.String_To_EO;
1331
1332    ------------------------------
1333    -- Raise_Exception_No_Defer --
1334    ------------------------------
1335
1336    procedure Raise_Exception_No_Defer
1337      (E       : Exception_Id;
1338       Message : String := "")
1339    is
1340    begin
1341       Exception_Data.Set_Exception_Msg (E, Message);
1342
1343       --  DO NOT CALL Abort_Defer.all; !!!!
1344       --  why not??? would be nice to have more comments here
1345
1346       Raise_Current_Excep (E);
1347    end Raise_Exception_No_Defer;
1348
1349    ---------------
1350    -- To_Stderr --
1351    ---------------
1352
1353    procedure To_Stderr (C : Character) is
1354
1355       type int is new Integer;
1356
1357       procedure put_char_stderr (C : int);
1358       pragma Import (C, put_char_stderr, "put_char_stderr");
1359
1360    begin
1361       put_char_stderr (Character'Pos (C));
1362    end To_Stderr;
1363
1364    procedure To_Stderr (S : String) is
1365    begin
1366       for J in S'Range loop
1367          if S (J) /= ASCII.CR then
1368             To_Stderr (S (J));
1369          end if;
1370       end loop;
1371    end To_Stderr;
1372
1373    ---------
1374    -- ZZZ --
1375    ---------
1376
1377    --  This dummy procedure gives us the end of the PC range for addresses
1378    --  within the exception unit itself. We hope that gigi/gcc keeps all the
1379    --  procedures in their original order!
1380
1381    procedure ZZZ is
1382    begin
1383       <<Start_Of_ZZZ>>
1384       Code_Address_For_ZZZ := Start_Of_ZZZ'Address;
1385    end ZZZ;
1386
1387 begin
1388    --  Allocate the Non-Tasking Machine_State
1389
1390    Set_Machine_State_Addr_NT (System.Address (Allocate_Machine_State));
1391
1392    --  Call the AAA/ZZZ routines to setup the code addresses for the
1393    --  bounds of this unit.
1394
1395    AAA;
1396    ZZZ;
1397 end Ada.Exceptions;