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    package Exception_Data is
 124
 125       ----------------------------------
 126       --  Exception messages routines --
 127       ----------------------------------
 128
 129       procedure Set_Exception_C_Msg
 130         (Id   : Exception_Id;
 131          Msg1 : Big_String_Ptr;
 132          Line : Integer        := 0;
 133          Msg2 : Big_String_Ptr := null);
 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. Msg1 is a null terminated string which is generated
 137       --  as the exception message. If line is non-zero, then a colon and
 138       --  the decimal representation of this integer is appended to the
 139       --  message. When Msg2 is non-null, a space and this additional null
 140       --  terminated string is added to the message.
 141
 142       procedure Set_Exception_Msg
 143         (Id      : Exception_Id;
 144          Message : String);
 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. Message is a string which is generated as the
 148       --  exception message.
 149
 150       --------------------------------------
 151       -- Exception information subprogram --
 152       --------------------------------------
 153
 154       function Exception_Information (X : Exception_Occurrence) return String;
 155       --  The format of the exception information is as follows:
 156       --
 157       --    exception name (as in Exception_Name)
 158       --    message (or a null line if no message)
 159       --    PID=nnnn
 160       --    0xyyyyyyyy 0xyyyyyyyy ...
 161       --
 162       --  The lines are separated by a ASCII.LF character
 163       --  The nnnn is the partition Id given as decimal digits.
 164       --  The 0x... line represents traceback program counter locations,
 165       --  in order with the first one being the exception location.
 166
 167       ---------------------------------------
 168       -- Exception backtracing subprograms --
 169       ---------------------------------------
 170
 171       --  What is automatically output when exception tracing is on basically
 172       --  corresponds to the usual exception information, but with the call
 173       --  chain backtrace possibly tailored by a backtrace decorator. Modifying
 174       --  Exception_Information itself is not a good idea because the decorated
 175       --  output is completely out of control and would break all our code
 176       --  related to the streaming of exceptions.
 177       --
 178       --  We then provide an alternative function to Exception_Information to
 179       --  compute the possibly tailored output, which is equivalent if no
 180       --  decorator is currently set.
 181
 182       function Tailored_Exception_Information
 183         (X    : Exception_Occurrence)
 184         return String;
 185       --  Exception information to be output in the case of automatic tracing
 186       --  requested through GNAT.Exception_Traces.
 187       --
 188       --  This is the same as Exception_Information if no backtrace decorator
 189       --  is currently in place. Otherwise, this is Exception_Information with
 190       --  the call chain raw addresses replaced by the result of a call to the
 191       --  current decorator provided with the call chain addresses.
 192
 193       pragma Export
 194         (Ada, Tailored_Exception_Information,
 195            "__gnat_tailored_exception_information");
 196       --  This function is used within this package but also from within
 197       --  System.Tasking.Stages.
 198       --
 199       --  The output of Exception_Information and
 200       --  Tailored_Exception_Information share a common part which was
 201       --  formerly built using local procedures within
 202       --  Exception_Information. These procedures have been extracted
 203       --  from their original place to be available to
 204       --  Tailored_Exception_Information also.
 205       --
 206       --  Each of these procedures appends some input to an
 207       --  information string currently being built. The Ptr argument
 208       --  represents the last position in this string at which a
 209       --  character has been written.
 210
 211       procedure Tailored_Exception_Information
 212         (X    : Exception_Occurrence;
 213          Buff : in out String;
 214          Last : in out Integer);
 215       --  Procedural version of the above function. Instead of returning the
 216       --  result, this one is put in Buff (Buff'first .. Buff'first + Last)
 217       --  And what happens on overflow ???
 218
 219    end Exception_Data;
 220
 221    package Exception_Traces is
 222
 223       use Exception_Data;
 224       --  Imports Tailored_Exception_Information
 225
 226       ----------------------------------------------
 227       -- Run-Time Exception Notification Routines --
 228       ----------------------------------------------
 229
 230       --  These subprograms provide a common run-time interface to trigger the
 231       --  actions required when an exception is about to be propagated (e.g.
 232       --  user specified actions or output of exception information). They are
 233       --  exported to be usable by the Ada exception handling personality
 234       --  routine when the GCC 3 mechanism is used.
 235
 236       procedure Notify_Handled_Exception;
 237       pragma Export (C, Notify_Handled_Exception,
 238                        "__gnat_notify_handled_exception");
 239       --  This routine is called for a handled occurrence is about to be
 240       --  propagated.
 241
 242       procedure Notify_Unhandled_Exception;
 243       pragma Export (C, Notify_Unhandled_Exception,
 244                        "__gnat_notify_unhandled_exception");
 245       --  This routine is called when an unhandled occurrence is about to be
 246       --  propagated.
 247
 248       procedure Unhandled_Exception_Terminate;
 249       pragma No_Return (Unhandled_Exception_Terminate);
 250       --  This procedure is called to terminate execution following an
 251       --  unhandled exception. The exception information, including
 252       --  traceback if available is output, and execution is then
 253       --  terminated. Note that at the point where this routine is
 254       --  called, the stack has typically been destroyed.
 255
 256    end Exception_Traces;
 257
 258    package Exception_Propagation is
 259
 260       use Exception_Traces;
 261       --  Imports Notify_Unhandled_Exception and
 262       --  Unhandled_Exception_Terminate
 263
 264       ------------------------------------
 265       -- Exception propagation routines --
 266       ------------------------------------
 267
 268       procedure Setup_Exception
 269         (Excep    : EOA;
 270          Current  : EOA;
 271          Reraised : Boolean := False);
 272       --  Perform the necessary operations to prepare the propagation of Excep
 273       --  in a task where Current is the current occurrence. Excep is assumed
 274       --  to be a valid (non null) pointer.
 275       --
 276       --  This should be called before any (re-)setting of the current
 277       --  occurrence. Any such (re-)setting shall take care *not* to clobber
 278       --  the Private_Data component.
 279       --
 280       --  Having Current provided as an argument (instead of retrieving it via
 281       --  Get_Current_Excep internally) is required to allow one task to setup
 282       --  an exception for another task, which is used by Transfer_Occurrence.
 283
 284       procedure Propagate_Exception (From_Signal_Handler : Boolean);
 285       pragma No_Return (Propagate_Exception);
 286       --  This procedure propagates the exception represented by the occurrence
 287       --  referenced by Current_Excep in the TSD for the current task.
 288
 289    end Exception_Propagation;
 290
 291    package Stream_Attributes is
 292
 293       --------------------------------
 294       -- Stream attributes routines --
 295       --------------------------------
 296
 297       function EId_To_String (X : Exception_Id) return String;
 298       function String_To_EId (S : String) return Exception_Id;
 299       --  Functions for implementing Exception_Id stream attributes
 300
 301       function EO_To_String (X : Exception_Occurrence) return String;
 302       function String_To_EO (S : String) return Exception_Occurrence;
 303       --  Functions for implementing Exception_Occurrence stream
 304       --  attributes
 305
 306    end Stream_Attributes;
 307
 308    procedure Raise_Current_Excep (E : Exception_Id);
 309    pragma No_Return (Raise_Current_Excep);
 310    pragma Export (C, Raise_Current_Excep, "__gnat_raise_nodefer_with_msg");
 311    --  This is a simple wrapper to Process_Raise_Exception setting the
 312    --  From_Signal_Handler argument to False.
 313    --
 314    --  This external name for Raise_Current_Excep is historical, and probably
 315    --  should be changed but for now we keep it, because gdb and gigi know
 316    --  about it.
 317
 318    procedure Raise_Exception_No_Defer
 319       (E : Exception_Id; Message : String := "");
 320    pragma Export
 321     (Ada, Raise_Exception_No_Defer,
 322      "ada__exceptions__raise_exception_no_defer");
 323    pragma No_Return (Raise_Exception_No_Defer);
 324    --  Similar to Raise_Exception, but with no abort deferral
 325
 326    procedure Raise_With_Msg (E : Exception_Id);
 327    pragma No_Return (Raise_With_Msg);
 328    pragma Export (C, Raise_With_Msg, "__gnat_raise_with_msg");
 329    --  Raises an exception with given exception id value. A message
 330    --  is associated with the raise, and has already been stored in the
 331    --  exception occurrence referenced by the Current_Excep in the TSD.
 332    --  Abort is deferred before the raise call.
 333
 334    procedure Raise_With_Msg (E : Exception_Id; Setup : Boolean);
 335    pragma No_Return (Raise_With_Msg);
 336    --  Similar to above, with an extra parameter to indicate wether
 337    --  Setup_Exception has been called already.
 338
 339    procedure Raise_After_Setup (E : Exception_Id);
 340    pragma No_Return (Raise_After_Setup);
 341    pragma Export (C, Raise_After_Setup, "__gnat_raise_after_setup");
 342    --  Wrapper to Raise_With_Msg and Setup set to True.
 343    --
 344    --  This is called by System.Tasking.Entry_Calls.Check_Exception when an
 345    --  exception has occured during an entry call. The exception to propagate
 346    --  has been setup and initialized via Transfer_Occurrence in this case.
 347
 348    procedure Raise_With_Location_And_Msg
 349      (E : Exception_Id;
 350       F : Big_String_Ptr;
 351       L : Integer;
 352       M : Big_String_Ptr := null);
 353    pragma No_Return (Raise_With_Location_And_Msg);
 354    --  Raise an exception with given exception id value. A filename and line
 355    --  number is associated with the raise and is stored in the exception
 356    --  occurrence and in addition a string message M is appended to
 357    --  this (if M is not null).
 358
 359    procedure Raise_Constraint_Error
 360      (File : Big_String_Ptr;
 361       Line : Integer);
 362    pragma No_Return (Raise_Constraint_Error);
 363    pragma Export
 364      (C, Raise_Constraint_Error, "__gnat_raise_constraint_error");
 365    --  Raise constraint error with file:line information
 366
 367    procedure Raise_Constraint_Error_Msg
 368      (File : Big_String_Ptr;
 369       Line : Integer;
 370       Msg  : Big_String_Ptr);
 371    pragma No_Return (Raise_Constraint_Error_Msg);
 372    pragma Export
 373      (C, Raise_Constraint_Error_Msg, "__gnat_raise_constraint_error_msg");
 374    --  Raise constraint error with file:line + msg information
 375
 376    procedure Raise_Program_Error
 377      (File : Big_String_Ptr;
 378       Line : Integer);
 379    pragma No_Return (Raise_Program_Error);
 380    pragma Export
 381      (C, Raise_Program_Error, "__gnat_raise_program_error");
 382    --  Raise program error with file:line information
 383
 384    procedure Raise_Program_Error_Msg
 385      (File : Big_String_Ptr;
 386       Line : Integer;
 387       Msg  : Big_String_Ptr);
 388    pragma No_Return (Raise_Program_Error_Msg);
 389    pragma Export
 390      (C, Raise_Program_Error_Msg, "__gnat_raise_program_error_msg");
 391    --  Raise program error with file:line + msg information
 392
 393    procedure Raise_Storage_Error
 394      (File : Big_String_Ptr;
 395       Line : Integer);
 396    pragma No_Return (Raise_Storage_Error);
 397    pragma Export
 398      (C, Raise_Storage_Error, "__gnat_raise_storage_error");
 399    --  Raise storage error with file:line information
 400
 401    procedure Raise_Storage_Error_Msg
 402      (File : Big_String_Ptr;
 403       Line : Integer;
 404       Msg  : Big_String_Ptr);
 405    pragma No_Return (Raise_Storage_Error_Msg);
 406    pragma Export
 407      (C, Raise_Storage_Error_Msg, "__gnat_raise_storage_error_msg");
 408    --  Raise storage error with file:line + reason msg information
 409
 410    --  The exception raising process and the automatic tracing mechanism rely
 411    --  on some careful use of flags attached to the exception occurrence. The
 412    --  graph below illustrates the relations between the Raise_ subprograms
 413    --  and identifies the points where basic flags such as Exception_Raised
 414    --  are initialized.
 415    --
 416    --  (i) signs indicate the flags initialization points. R stands for Raise,
 417    --  W for With, and E for Exception.
 418    --
 419    --                   R_No_Msg    R_E   R_Pe  R_Ce  R_Se
 420    --                       |        |     |     |     |
 421    --                       +--+  +--+     +---+ | +---+
 422    --                          |  |            | | |
 423    --     R_E_No_Defer(i)    R_W_Msg(i)       R_W_Loc
 424    --           |               |              |   |
 425    --           +------------+  |  +-----------+   +--+
 426    --                        |  |  |                  |
 427    --                        |  |  |             Set_E_C_Msg(i)
 428    --                        |  |  |
 429    --                   Raise_Current_Excep
 430
 431    procedure Reraise;
 432    pragma No_Return (Reraise);
 433    pragma Export (C, Reraise, "__gnat_reraise");
 434    --  Reraises the exception referenced by the Current_Excep field of
 435    --  the TSD (all fields of this exception occurrence are set). Abort
 436    --  is deferred before the reraise operation.
 437
 438    --  Save_Occurrence variations: As the management of the private data
 439    --  attached to occurrences is delicate, wether or not pointers to such
 440    --  data has to be copied in various situations is better made explicit.
 441    --  The following procedures provide an internal interface to help making
 442    --  this explicit.
 443
 444    procedure Save_Occurrence_And_Private
 445      (Target : out Exception_Occurrence;
 446       Source : Exception_Occurrence);
 447    --  Copy all the components of Source to Target as well as the
 448    --  Private_Data pointer.
 449
 450    procedure Save_Occurrence_No_Private
 451      (Target : out Exception_Occurrence;
 452       Source : Exception_Occurrence);
 453    --  Copy all the components of Source to Target, except the
 454    --  Private_Data pointer.
 455
 456    procedure Transfer_Occurrence
 457      (Target : Exception_Occurrence_Access;
 458       Source : Exception_Occurrence);
 459    pragma Export (C, Transfer_Occurrence, "__gnat_transfer_occurrence");
 460    --  Called from System.Tasking.RendezVous.Exceptional_Complete_RendezVous
 461    --  to setup Target from Source as an exception to be propagated in the
 462    --  caller task. Target is expected to be a pointer to the fixed TSD
 463    --  occurrence for this task.
 464
 465    -----------------------------
 466    -- Run-Time Check Routines --
 467    -----------------------------
 468
 469    --  These routines are called from the runtime to raise a specific
 470    --  exception with a reason message attached. The parameters are
 471    --  the file name and line number in each case. The names are keyed
 472    --  to the codes defined in Types.ads and a-types.h (for example,
 473    --  the name Rcheck_05 refers to the Reason whose Pos code is 5).
 474
 475    procedure Rcheck_00 (File : Big_String_Ptr; Line : Integer);
 476    procedure Rcheck_01 (File : Big_String_Ptr; Line : Integer);
 477    procedure Rcheck_02 (File : Big_String_Ptr; Line : Integer);
 478    procedure Rcheck_03 (File : Big_String_Ptr; Line : Integer);
 479    procedure Rcheck_04 (File : Big_String_Ptr; Line : Integer);
 480    procedure Rcheck_05 (File : Big_String_Ptr; Line : Integer);
 481    procedure Rcheck_06 (File : Big_String_Ptr; Line : Integer);
 482    procedure Rcheck_07 (File : Big_String_Ptr; Line : Integer);
 483    procedure Rcheck_08 (File : Big_String_Ptr; Line : Integer);
 484    procedure Rcheck_09 (File : Big_String_Ptr; Line : Integer);
 485    procedure Rcheck_10 (File : Big_String_Ptr; Line : Integer);
 486    procedure Rcheck_11 (File : Big_String_Ptr; Line : Integer);
 487    procedure Rcheck_12 (File : Big_String_Ptr; Line : Integer);
 488    procedure Rcheck_13 (File : Big_String_Ptr; Line : Integer);
 489    procedure Rcheck_14 (File : Big_String_Ptr; Line : Integer);
 490    procedure Rcheck_15 (File : Big_String_Ptr; Line : Integer);
 491    procedure Rcheck_16 (File : Big_String_Ptr; Line : Integer);
 492    procedure Rcheck_17 (File : Big_String_Ptr; Line : Integer);
 493    procedure Rcheck_18 (File : Big_String_Ptr; Line : Integer);
 494    procedure Rcheck_19 (File : Big_String_Ptr; Line : Integer);
 495    procedure Rcheck_20 (File : Big_String_Ptr; Line : Integer);
 496    procedure Rcheck_21 (File : Big_String_Ptr; Line : Integer);
 497    procedure Rcheck_22 (File : Big_String_Ptr; Line : Integer);
 498    procedure Rcheck_23 (File : Big_String_Ptr; Line : Integer);
 499    procedure Rcheck_24 (File : Big_String_Ptr; Line : Integer);
 500    procedure Rcheck_25 (File : Big_String_Ptr; Line : Integer);
 501    procedure Rcheck_26 (File : Big_String_Ptr; Line : Integer);
 502    procedure Rcheck_27 (File : Big_String_Ptr; Line : Integer);
 503    procedure Rcheck_28 (File : Big_String_Ptr; Line : Integer);
 504    procedure Rcheck_29 (File : Big_String_Ptr; Line : Integer);
 505
 506    pragma Export (C, Rcheck_00, "__gnat_rcheck_00");
 507    pragma Export (C, Rcheck_01, "__gnat_rcheck_01");
 508    pragma Export (C, Rcheck_02, "__gnat_rcheck_02");
 509    pragma Export (C, Rcheck_03, "__gnat_rcheck_03");
 510    pragma Export (C, Rcheck_04, "__gnat_rcheck_04");
 511    pragma Export (C, Rcheck_05, "__gnat_rcheck_05");
 512    pragma Export (C, Rcheck_06, "__gnat_rcheck_06");
 513    pragma Export (C, Rcheck_07, "__gnat_rcheck_07");
 514    pragma Export (C, Rcheck_08, "__gnat_rcheck_08");
 515    pragma Export (C, Rcheck_09, "__gnat_rcheck_09");
 516    pragma Export (C, Rcheck_10, "__gnat_rcheck_10");
 517    pragma Export (C, Rcheck_11, "__gnat_rcheck_11");
 518    pragma Export (C, Rcheck_12, "__gnat_rcheck_12");
 519    pragma Export (C, Rcheck_13, "__gnat_rcheck_13");
 520    pragma Export (C, Rcheck_14, "__gnat_rcheck_14");
 521    pragma Export (C, Rcheck_15, "__gnat_rcheck_15");
 522    pragma Export (C, Rcheck_16, "__gnat_rcheck_16");
 523    pragma Export (C, Rcheck_17, "__gnat_rcheck_17");
 524    pragma Export (C, Rcheck_18, "__gnat_rcheck_18");
 525    pragma Export (C, Rcheck_19, "__gnat_rcheck_19");
 526    pragma Export (C, Rcheck_20, "__gnat_rcheck_20");
 527    pragma Export (C, Rcheck_21, "__gnat_rcheck_21");
 528    pragma Export (C, Rcheck_22, "__gnat_rcheck_22");
 529    pragma Export (C, Rcheck_23, "__gnat_rcheck_23");
 530    pragma Export (C, Rcheck_24, "__gnat_rcheck_24");
 531    pragma Export (C, Rcheck_25, "__gnat_rcheck_25");
 532    pragma Export (C, Rcheck_26, "__gnat_rcheck_26");
 533    pragma Export (C, Rcheck_27, "__gnat_rcheck_27");
 534    pragma Export (C, Rcheck_28, "__gnat_rcheck_28");
 535    pragma Export (C, Rcheck_29, "__gnat_rcheck_29");
 536
 537    ---------------------------------------------
 538    -- Reason Strings for Run-Time Check Calls --
 539    ---------------------------------------------
 540
 541    --  These strings are null-terminated and are used by Rcheck_nn. The
 542    --  strings correspond to the definitions for Types.RT_Exception_Code.
 543
 544    use ASCII;
 545
 546    Rmsg_00 : constant String := "access check failed"              & NUL;
 547    Rmsg_01 : constant String := "access parameter is null"         & NUL;
 548    Rmsg_02 : constant String := "discriminant check failed"        & NUL;
 549    Rmsg_03 : constant String := "divide by zero"                   & NUL;
 550    Rmsg_04 : constant String := "explicit raise"                   & NUL;
 551    Rmsg_05 : constant String := "index check failed"               & NUL;
 552    Rmsg_06 : constant String := "invalid data"                     & NUL;
 553    Rmsg_07 : constant String := "length check failed"              & NUL;
 554    Rmsg_08 : constant String := "overflow check failed"            & NUL;
 555    Rmsg_09 : constant String := "partition check failed"           & NUL;
 556    Rmsg_10 : constant String := "range check failed"               & NUL;
 557    Rmsg_11 : constant String := "tag check failed"                 & NUL;
 558    Rmsg_12 : constant String := "access before elaboration"        & NUL;
 559    Rmsg_13 : constant String := "accessibility check failed"       & NUL;
 560    Rmsg_14 : constant String := "all guards closed"                & NUL;
 561    Rmsg_15 : constant String := "duplicated entry address"         & NUL;
 562    Rmsg_16 : constant String := "explicit raise"                   & NUL;
 563    Rmsg_17 : constant String := "finalize/adjust raised exception" & NUL;
 564    Rmsg_18 : constant String := "misaligned address value"         & NUL;
 565    Rmsg_19 : constant String := "missing return"                   & NUL;
 566    Rmsg_20 : constant String := "overlaid controlled object"       & NUL;
 567    Rmsg_21 : constant String := "potentially blocking operation"   & NUL;
 568    Rmsg_22 : constant String := "stubbed subprogram called"        & NUL;
 569    Rmsg_23 : constant String := "unchecked union restriction"      & NUL;
 570    Rmsg_24 : constant String := "illegal use of"
 571              & " remote access-to-class-wide type, see RM E.4(18)" & NUL;
 572    Rmsg_25 : constant String := "empty storage pool"               & NUL;
 573    Rmsg_26 : constant String := "explicit raise"                   & NUL;
 574    Rmsg_27 : constant String := "infinite recursion"               & NUL;
 575    Rmsg_28 : constant String := "object too large"                 & NUL;
 576    Rmsg_29 : constant String := "restriction violation"            & NUL;
 577
 578    -----------------------
 579    -- Polling Interface --
 580    -----------------------
 581
 582    type Unsigned is mod 2 ** 32;
 583
 584    Counter : Unsigned := 0;
 585    pragma Warnings (Off, Counter);
 586    --  This counter is provided for convenience. It can be used in Poll to
 587    --  perform periodic but not systematic operations.
 588
 589    procedure Poll is separate;
 590    --  The actual polling routine is separate, so that it can easily
 591    --  be replaced with a target dependent version.
 592
 593    ---------
 594    -- AAA --
 595    ---------
 596
 597    --  This dummy procedure gives us the start of the PC range for addresses
 598    --  within the exception unit itself. We hope that gigi/gcc keep all the
 599    --  procedures in their original order!
 600
 601    procedure AAA is
 602    begin
 603       <<Start_Of_AAA>>
 604       Code_Address_For_AAA := Start_Of_AAA'Address;
 605    end AAA;
 606
 607    ----------------
 608    -- Call_Chain --
 609    ----------------
 610
 611    procedure Call_Chain (Excep : EOA) is separate;
 612    --  The actual Call_Chain routine is separate, so that it can easily
 613    --  be dummied out when no exception traceback information is needed.
 614
 615    ------------------------------
 616    -- Current_Target_Exception --
 617    ------------------------------
 618
 619    function Current_Target_Exception return Exception_Occurrence is
 620    begin
 621       return Null_Occurrence;
 622    end Current_Target_Exception;
 623
 624    -------------------
 625    -- EId_To_String --
 626    -------------------
 627
 628    function EId_To_String (X : Exception_Id) return String
 629      renames Stream_Attributes.EId_To_String;
 630
 631    ------------------
 632    -- EO_To_String --
 633    ------------------
 634
 635    --  We use the null string to represent the null occurrence, otherwise
 636    --  we output the Exception_Information string for the occurrence.
 637
 638    function EO_To_String (X : Exception_Occurrence) return String
 639      renames Stream_Attributes.EO_To_String;
 640
 641    ------------------------
 642    -- Exception_Identity --
 643    ------------------------
 644
 645    function Exception_Identity
 646      (X    : Exception_Occurrence)
 647       return Exception_Id
 648    is
 649    begin
 650       if X.Id = Null_Id then
 651          raise Constraint_Error;
 652       else
 653          return X.Id;
 654       end if;
 655    end Exception_Identity;
 656
 657    ---------------------------
 658    -- Exception_Information --
 659    ---------------------------
 660
 661    function Exception_Information (X : Exception_Occurrence) return String
 662      renames Exception_Data.Exception_Information;
 663
 664    -----------------------
 665    -- Exception_Message --
 666    -----------------------
 667
 668    function Exception_Message (X : Exception_Occurrence) return String is
 669    begin
 670       if X.Id = Null_Id then
 671          raise Constraint_Error;
 672       end if;
 673
 674       return X.Msg (1 .. X.Msg_Length);
 675    end Exception_Message;
 676
 677    --------------------
 678    -- Exception_Name --
 679    --------------------
 680
 681    function Exception_Name (Id : Exception_Id) return String is
 682    begin
 683       if Id = null then
 684          raise Constraint_Error;
 685       end if;
 686
 687       return Id.Full_Name.all (1 .. Id.Name_Length - 1);
 688    end Exception_Name;
 689
 690    function Exception_Name (X : Exception_Occurrence) return String is
 691    begin
 692       return Exception_Name (X.Id);
 693    end Exception_Name;
 694
 695    ---------------------------
 696    -- Exception_Name_Simple --
 697    ---------------------------
 698
 699    function Exception_Name_Simple (X : Exception_Occurrence) return String is
 700       Name : constant String := Exception_Name (X);
 701       P    : Natural;
 702
 703    begin
 704       P := Name'Length;
 705       while P > 1 loop
 706          exit when Name (P - 1) = '.';
 707          P := P - 1;
 708       end loop;
 709
 710       --  Return result making sure lower bound is 1
 711
 712       declare
 713          subtype Rname is String (1 .. Name'Length - P + 1);
 714       begin
 715          return Rname (Name (P .. Name'Length));
 716       end;
 717    end Exception_Name_Simple;
 718
 719    --------------------
 720    -- Exception_Data --
 721    --------------------
 722
 723    package body Exception_Data is separate;
 724    --  This package can be easily dummied out if we do not want the
 725    --  basic support for exception messages (such as in Ada 83).
 726
 727    ---------------------------
 728    -- Exception_Propagation --
 729    ---------------------------
 730
 731    package body Exception_Propagation is separate;
 732    --  Depending on the actual exception mechanism used (front-end or
 733    --  back-end based), the implementation will differ, which is why this
 734    --  package is separated.
 735
 736    ----------------------
 737    -- Exception_Traces --
 738    ----------------------
 739
 740    package body Exception_Traces is separate;
 741    --  Depending on the underlying support for IO the implementation
 742    --  will differ. Moreover we would like to dummy out this package
 743    --  in case we do not want any exception tracing support. This is
 744    --  why this package is separated.
 745
 746    -----------------------
 747    -- Stream Attributes --
 748    -----------------------
 749
 750    package body Stream_Attributes is separate;
 751    --  This package can be easily dummied out if we do not want the
 752    --  support for streaming Exception_Ids and Exception_Occurrences.
 753
 754    -----------------------------
 755    -- Process_Raise_Exception --
 756    -----------------------------
 757
 758    procedure Process_Raise_Exception
 759      (E                   : Exception_Id;
 760       From_Signal_Handler : Boolean)
 761    is
 762       pragma Inspection_Point (E);
 763       --  This is so the debugger can reliably inspect the parameter
 764
 765       Jumpbuf_Ptr : constant Address := Get_Jmpbuf_Address.all;
 766       Excep       : EOA := Get_Current_Excep.all;
 767
 768    begin
 769       --  WARNING : There should be no exception handler for this body
 770       --  because this would cause gigi to prepend a setup for a new
 771       --  jmpbuf to the sequence of statements. We would then always get
 772       --  this new buf in Jumpbuf_Ptr instead of the one for the exception
 773       --  we are handling, which would completely break the whole design
 774       --  of this procedure.
 775
 776       --  Processing varies between zero cost and setjmp/lonjmp processing.
 777
 778       if Zero_Cost_Exceptions /= 0 then
 779
 780          --  Use the front-end tables to propagate if we have them, otherwise
 781          --  resort to the GCC back-end alternative. Backtrace computation is
 782          --  performed, if required, by the underlying routine. Notifications
 783          --  for the debugger are also not performed here, because we do not
 784          --  yet know if the exception is handled.
 785
 786          Exception_Propagation.Propagate_Exception (From_Signal_Handler);
 787
 788       else
 789          --  Compute the backtrace for this occurrence if the corresponding
 790          --  binder option has been set. Call_Chain takes care of the reraise
 791          --  case.
 792
 793          Call_Chain (Excep);
 794          --  We used to only do this if From_Signal_Handler was not set,
 795          --  based on the assumption that backtracing from a signal handler
 796          --  would not work due to stack layout oddities. However, since
 797          --
 798          --   1. The flag is never set in tasking programs (Notify_Exception
 799          --      performs regular raise statements), and
 800          --
 801          --   2. No problem has shown up in tasking programs around here so
 802          --      far, this turned out to be too strong an assumption.
 803          --
 804          --  As, in addition, the test was
 805          --
 806          --   1. preventing the production of backtraces in non-tasking
 807          --      programs, and
 808          --
 809          --   2. introducing a behavior inconsistency between
 810          --      the tasking and non-tasking cases,
 811          --
 812          --  we have simply removed it.
 813
 814          --  If the jump buffer pointer is non-null, transfer control using
 815          --  it. Otherwise announce an unhandled exception (note that this
 816          --  means that we have no finalizations to do other than at the outer
 817          --  level). Perform the necessary notification tasks in both cases.
 818
 819          if Jumpbuf_Ptr /= Null_Address then
 820
 821             if not Excep.Exception_Raised then
 822                Excep.Exception_Raised := True;
 823                Exception_Traces.Notify_Handled_Exception;
 824             end if;
 825
 826             builtin_longjmp (Jumpbuf_Ptr, 1);
 827
 828          else
 829             --  The pragma Inspection point here ensures that the debugger
 830             --  can inspect the parameter.
 831
 832             pragma Inspection_Point (E);
 833
 834             Exception_Traces.Notify_Unhandled_Exception;
 835             Exception_Traces.Unhandled_Exception_Terminate;
 836          end if;
 837       end if;
 838    end Process_Raise_Exception;
 839
 840    ----------------------------
 841    -- Raise_Constraint_Error --
 842    ----------------------------
 843
 844    procedure Raise_Constraint_Error
 845      (File : Big_String_Ptr;
 846       Line : Integer)
 847    is
 848    begin
 849       Raise_With_Location_And_Msg
 850         (Constraint_Error_Def'Access, File, Line);
 851    end Raise_Constraint_Error;
 852
 853    --------------------------------
 854    -- Raise_Constraint_Error_Msg --
 855    --------------------------------
 856
 857    procedure Raise_Constraint_Error_Msg
 858      (File : Big_String_Ptr;
 859       Line : Integer;
 860       Msg  : Big_String_Ptr)
 861    is
 862    begin
 863       Raise_With_Location_And_Msg
 864         (Constraint_Error_Def'Access, File, Line, Msg);
 865    end Raise_Constraint_Error_Msg;
 866
 867    -------------------------
 868    -- Raise_Current_Excep --
 869    -------------------------
 870
 871    procedure Raise_Current_Excep (E : Exception_Id) is
 872       pragma Inspection_Point (E);
 873       --  This is so the debugger can reliably inspect the parameter
 874    begin
 875       Process_Raise_Exception (E => E, From_Signal_Handler => False);
 876    end Raise_Current_Excep;
 877
 878    ---------------------
 879    -- Raise_Exception --
 880    ---------------------
 881
 882    procedure Raise_Exception
 883      (E       : Exception_Id;
 884       Message : String := "")
 885    is
 886    begin
 887       if E /= null then
 888          Exception_Data.Set_Exception_Msg (E, Message);
 889          Abort_Defer.all;
 890          Raise_Current_Excep (E);
 891       end if;
 892    end Raise_Exception;
 893
 894    ----------------------------
 895    -- Raise_Exception_Always --
 896    ----------------------------
 897
 898    procedure Raise_Exception_Always
 899      (E       : Exception_Id;
 900       Message : String := "")
 901    is
 902    begin
 903       Exception_Data.Set_Exception_Msg (E, Message);
 904       Abort_Defer.all;
 905       Raise_Current_Excep (E);
 906    end Raise_Exception_Always;
 907
 908    -------------------------------
 909    -- Raise_From_Signal_Handler --
 910    -------------------------------
 911
 912    procedure Raise_From_Signal_Handler
 913      (E : Exception_Id;
 914       M : Big_String_Ptr)
 915    is
 916    begin
 917       Exception_Data.Set_Exception_C_Msg (E, M);
 918       Abort_Defer.all;
 919       Process_Raise_Exception (E => E, From_Signal_Handler => True);
 920    end Raise_From_Signal_Handler;
 921
 922    -------------------------
 923    -- Raise_Program_Error --
 924    -------------------------
 925
 926    procedure Raise_Program_Error
 927      (File : Big_String_Ptr;
 928       Line : Integer)
 929    is
 930    begin
 931       Raise_With_Location_And_Msg
 932         (Program_Error_Def'Access, File, Line);
 933    end Raise_Program_Error;
 934
 935    -----------------------------
 936    -- Raise_Program_Error_Msg --
 937    -----------------------------
 938
 939    procedure Raise_Program_Error_Msg
 940      (File : Big_String_Ptr;
 941       Line : Integer;
 942       Msg  : Big_String_Ptr)
 943    is
 944    begin
 945       Raise_With_Location_And_Msg
 946         (Program_Error_Def'Access, File, Line, Msg);
 947    end Raise_Program_Error_Msg;
 948
 949    -------------------------
 950    -- Raise_Storage_Error --
 951    -------------------------
 952
 953    procedure Raise_Storage_Error
 954      (File : Big_String_Ptr;
 955       Line : Integer)
 956    is
 957    begin
 958       Raise_With_Location_And_Msg
 959         (Storage_Error_Def'Access, File, Line);
 960    end Raise_Storage_Error;
 961
 962    -----------------------------
 963    -- Raise_Storage_Error_Msg --
 964    -----------------------------
 965
 966    procedure Raise_Storage_Error_Msg
 967      (File : Big_String_Ptr;
 968       Line : Integer;
 969       Msg  : Big_String_Ptr)
 970    is
 971    begin
 972       Raise_With_Location_And_Msg
 973         (Storage_Error_Def'Access, File, Line, Msg);
 974    end Raise_Storage_Error_Msg;
 975
 976    ---------------------------------
 977    -- Raise_With_Location_And_Msg --
 978    ---------------------------------
 979
 980    procedure Raise_With_Location_And_Msg
 981      (E : Exception_Id;
 982       F : Big_String_Ptr;
 983       L : Integer;
 984       M : Big_String_Ptr := null)
 985    is
 986    begin
 987       Exception_Data.Set_Exception_C_Msg (E, F, L, M);
 988       Abort_Defer.all;
 989       Raise_Current_Excep (E);
 990    end Raise_With_Location_And_Msg;
 991
 992    --------------------
 993    -- Raise_With_Msg --
 994    --------------------
 995
 996    procedure Raise_With_Msg (E : Exception_Id; Setup : Boolean) is
 997       Excep : constant EOA := Get_Current_Excep.all;
 998
 999    begin
1000       if not Setup then
1001          Exception_Propagation.Setup_Exception (Excep, Excep);
1002       end if;
1003
1004       Excep.Exception_Raised := False;
1005       Excep.Id               := E;
1006       Excep.Num_Tracebacks   := 0;
1007       Excep.Cleanup_Flag     := False;
1008       Excep.Pid              := Local_Partition_ID;
1009       Abort_Defer.all;
1010       Raise_Current_Excep (E);
1011    end Raise_With_Msg;
1012
1013    procedure Raise_With_Msg (E : Exception_Id) is
1014    begin
1015       Raise_With_Msg (E, Setup => False);
1016    end Raise_With_Msg;
1017
1018    -----------------------
1019    -- Raise_After_Setup --
1020    -----------------------
1021
1022    procedure Raise_After_Setup (E : Exception_Id) is
1023    begin
1024       Raise_With_Msg (E, Setup => True);
1025    end Raise_After_Setup;
1026
1027    --------------------------------------
1028    -- Calls to Run-Time Check Routines --
1029    --------------------------------------
1030
1031    procedure Rcheck_00 (File : Big_String_Ptr; Line : Integer) is
1032    begin
1033       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_00'Address));
1034    end Rcheck_00;
1035
1036    procedure Rcheck_01 (File : Big_String_Ptr; Line : Integer) is
1037    begin
1038       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_01'Address));
1039    end Rcheck_01;
1040
1041    procedure Rcheck_02 (File : Big_String_Ptr; Line : Integer) is
1042    begin
1043       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_02'Address));
1044    end Rcheck_02;
1045
1046    procedure Rcheck_03 (File : Big_String_Ptr; Line : Integer) is
1047    begin
1048       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_03'Address));
1049    end Rcheck_03;
1050
1051    procedure Rcheck_04 (File : Big_String_Ptr; Line : Integer) is
1052    begin
1053       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_04'Address));
1054    end Rcheck_04;
1055
1056    procedure Rcheck_05 (File : Big_String_Ptr; Line : Integer) is
1057    begin
1058       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_05'Address));
1059    end Rcheck_05;
1060
1061    procedure Rcheck_06 (File : Big_String_Ptr; Line : Integer) is
1062    begin
1063       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_06'Address));
1064    end Rcheck_06;
1065
1066    procedure Rcheck_07 (File : Big_String_Ptr; Line : Integer) is
1067    begin
1068       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_07'Address));
1069    end Rcheck_07;
1070
1071    procedure Rcheck_08 (File : Big_String_Ptr; Line : Integer) is
1072    begin
1073       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_08'Address));
1074    end Rcheck_08;
1075
1076    procedure Rcheck_09 (File : Big_String_Ptr; Line : Integer) is
1077    begin
1078       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_09'Address));
1079    end Rcheck_09;
1080
1081    procedure Rcheck_10 (File : Big_String_Ptr; Line : Integer) is
1082    begin
1083       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_10'Address));
1084    end Rcheck_10;
1085
1086    procedure Rcheck_11 (File : Big_String_Ptr; Line : Integer) is
1087    begin
1088       Raise_Constraint_Error_Msg (File, Line, To_Ptr (Rmsg_11'Address));
1089    end Rcheck_11;
1090
1091    procedure Rcheck_12 (File : Big_String_Ptr; Line : Integer) is
1092    begin
1093       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_12'Address));
1094    end Rcheck_12;
1095
1096    procedure Rcheck_13 (File : Big_String_Ptr; Line : Integer) is
1097    begin
1098       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_13'Address));
1099    end Rcheck_13;
1100
1101    procedure Rcheck_14 (File : Big_String_Ptr; Line : Integer) is
1102    begin
1103       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_14'Address));
1104    end Rcheck_14;
1105
1106    procedure Rcheck_15 (File : Big_String_Ptr; Line : Integer) is
1107    begin
1108       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_15'Address));
1109    end Rcheck_15;
1110
1111    procedure Rcheck_16 (File : Big_String_Ptr; Line : Integer) is
1112    begin
1113       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_16'Address));
1114    end Rcheck_16;
1115
1116    procedure Rcheck_17 (File : Big_String_Ptr; Line : Integer) is
1117    begin
1118       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_17'Address));
1119    end Rcheck_17;
1120
1121    procedure Rcheck_18 (File : Big_String_Ptr; Line : Integer) is
1122    begin
1123       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_18'Address));
1124    end Rcheck_18;
1125
1126    procedure Rcheck_19 (File : Big_String_Ptr; Line : Integer) is
1127    begin
1128       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_19'Address));
1129    end Rcheck_19;
1130
1131    procedure Rcheck_20 (File : Big_String_Ptr; Line : Integer) is
1132    begin
1133       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_20'Address));
1134    end Rcheck_20;
1135
1136    procedure Rcheck_21 (File : Big_String_Ptr; Line : Integer) is
1137    begin
1138       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_21'Address));
1139    end Rcheck_21;
1140
1141    procedure Rcheck_22 (File : Big_String_Ptr; Line : Integer) is
1142    begin
1143       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_22'Address));
1144    end Rcheck_22;
1145
1146    procedure Rcheck_23 (File : Big_String_Ptr; Line : Integer) is
1147    begin
1148       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_23'Address));
1149    end Rcheck_23;
1150
1151    procedure Rcheck_24 (File : Big_String_Ptr; Line : Integer) is
1152    begin
1153       Raise_Program_Error_Msg (File, Line, To_Ptr (Rmsg_24'Address));
1154    end Rcheck_24;
1155
1156    procedure Rcheck_25 (File : Big_String_Ptr; Line : Integer) is
1157    begin
1158       Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_25'Address));
1159    end Rcheck_25;
1160
1161    procedure Rcheck_26 (File : Big_String_Ptr; Line : Integer) is
1162    begin
1163       Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_26'Address));
1164    end Rcheck_26;
1165
1166    procedure Rcheck_27 (File : Big_String_Ptr; Line : Integer) is
1167    begin
1168       Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_27'Address));
1169    end Rcheck_27;
1170
1171    procedure Rcheck_28 (File : Big_String_Ptr; Line : Integer) is
1172    begin
1173       Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_28'Address));
1174    end Rcheck_28;
1175
1176    procedure Rcheck_29 (File : Big_String_Ptr; Line : Integer) is
1177    begin
1178       Raise_Storage_Error_Msg (File, Line, To_Ptr (Rmsg_29'Address));
1179    end Rcheck_29;
1180
1181    -------------
1182    -- Reraise --
1183    -------------
1184
1185    procedure Reraise is
1186       Excep : constant EOA := Get_Current_Excep.all;
1187
1188    begin
1189       Abort_Defer.all;
1190       Exception_Propagation.Setup_Exception (Excep, Excep, Reraised => True);
1191       Raise_Current_Excep (Excep.Id);
1192    end Reraise;
1193
1194    ------------------------
1195    -- Reraise_Occurrence --
1196    ------------------------
1197
1198    procedure Reraise_Occurrence (X : Exception_Occurrence) is
1199    begin
1200       if X.Id /= null then
1201          Abort_Defer.all;
1202          Exception_Propagation.Setup_Exception
1203            (X'Unrestricted_Access, Get_Current_Excep.all, Reraised => True);
1204          Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1205          Raise_Current_Excep (X.Id);
1206       end if;
1207    end Reraise_Occurrence;
1208
1209    -------------------------------
1210    -- Reraise_Occurrence_Always --
1211    -------------------------------
1212
1213    procedure Reraise_Occurrence_Always (X : Exception_Occurrence) is
1214    begin
1215       Abort_Defer.all;
1216       Exception_Propagation.Setup_Exception
1217         (X'Unrestricted_Access, Get_Current_Excep.all, Reraised => True);
1218       Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1219       Raise_Current_Excep (X.Id);
1220    end Reraise_Occurrence_Always;
1221
1222    ---------------------------------
1223    -- Reraise_Occurrence_No_Defer --
1224    ---------------------------------
1225
1226    procedure Reraise_Occurrence_No_Defer (X : Exception_Occurrence) is
1227    begin
1228       Exception_Propagation.Setup_Exception
1229         (X'Unrestricted_Access, Get_Current_Excep.all, Reraised => True);
1230       Save_Occurrence_No_Private (Get_Current_Excep.all.all, X);
1231       Raise_Current_Excep (X.Id);
1232    end Reraise_Occurrence_No_Defer;
1233
1234    ---------------------
1235    -- Save_Occurrence --
1236    ---------------------
1237
1238    procedure Save_Occurrence
1239      (Target : out Exception_Occurrence;
1240       Source : Exception_Occurrence)
1241    is
1242    begin
1243       Save_Occurrence_No_Private (Target, Source);
1244    end Save_Occurrence;
1245
1246    function Save_Occurrence
1247      (Source : Exception_Occurrence)
1248       return   EOA
1249    is
1250       Target : EOA := new Exception_Occurrence;
1251
1252    begin
1253       Save_Occurrence (Target.all, Source);
1254       return Target;
1255    end Save_Occurrence;
1256
1257    --------------------------------
1258    -- Save_Occurrence_And_Private --
1259    --------------------------------
1260
1261    procedure Save_Occurrence_And_Private
1262      (Target : out Exception_Occurrence;
1263       Source : Exception_Occurrence)
1264    is
1265    begin
1266       Save_Occurrence_No_Private (Target, Source);
1267       Target.Private_Data := Source.Private_Data;
1268    end Save_Occurrence_And_Private;
1269
1270    --------------------------------
1271    -- Save_Occurrence_No_Private --
1272    --------------------------------
1273
1274    procedure Save_Occurrence_No_Private
1275      (Target : out Exception_Occurrence;
1276       Source : Exception_Occurrence)
1277    is
1278    begin
1279       Target.Id             := Source.Id;
1280       Target.Msg_Length     := Source.Msg_Length;
1281       Target.Num_Tracebacks := Source.Num_Tracebacks;
1282       Target.Pid            := Source.Pid;
1283       Target.Cleanup_Flag   := Source.Cleanup_Flag;
1284
1285       Target.Msg (1 .. Target.Msg_Length) :=
1286         Source.Msg (1 .. Target.Msg_Length);
1287
1288       Target.Tracebacks (1 .. Target.Num_Tracebacks) :=
1289         Source.Tracebacks (1 .. Target.Num_Tracebacks);
1290    end Save_Occurrence_No_Private;
1291
1292    -------------------------
1293    -- Transfer_Occurrence --
1294    -------------------------
1295
1296    procedure Transfer_Occurrence
1297      (Target : Exception_Occurrence_Access;
1298       Source : Exception_Occurrence)
1299    is
1300    begin
1301       --  Setup Target as an exception to be propagated in the calling task
1302       --  (rendezvous-wise), taking care not to clobber the associated private
1303       --  data.  Target is expected to be a pointer to the calling task's
1304       --  fixed TSD occurrence, which is very different from Get_Current_Excep
1305       --  here because this subprogram is called from the called task.
1306
1307       Exception_Propagation.Setup_Exception (Target, Target);
1308       Save_Occurrence_No_Private (Target.all, Source);
1309    end Transfer_Occurrence;
1310
1311    -------------------
1312    -- String_To_EId --
1313    -------------------
1314
1315    function String_To_EId (S : String) return Exception_Id
1316      renames Stream_Attributes.String_To_EId;
1317
1318    ------------------
1319    -- String_To_EO --
1320    ------------------
1321
1322    function String_To_EO (S : String) return Exception_Occurrence
1323      renames Stream_Attributes.String_To_EO;
1324
1325    ------------------------------
1326    -- Raise_Exception_No_Defer --
1327    ------------------------------
1328
1329    procedure Raise_Exception_No_Defer
1330      (E       : Exception_Id;
1331       Message : String := "")
1332    is
1333    begin
1334       Exception_Data.Set_Exception_Msg (E, Message);
1335
1336       --  DO NOT CALL Abort_Defer.all; !!!!
1337       --  why not??? would be nice to have more comments here
1338
1339       Raise_Current_Excep (E);
1340    end Raise_Exception_No_Defer;
1341
1342    ---------
1343    -- ZZZ --
1344    ---------
1345
1346    --  This dummy procedure gives us the end of the PC range for addresses
1347    --  within the exception unit itself. We hope that gigi/gcc keeps all the
1348    --  procedures in their original order!
1349
1350    procedure ZZZ is
1351    begin
1352       <<Start_Of_ZZZ>>
1353       Code_Address_For_ZZZ := Start_Of_ZZZ'Address;
1354    end ZZZ;
1355
1356 begin
1357    --  Allocate the Non-Tasking Machine_State
1358
1359    Set_Machine_State_Addr_NT (System.Address (Allocate_Machine_State));
1360
1361    --  Call the AAA/ZZZ routines to setup the code addresses for the
1362    --  bounds of this unit.
1363
1364    AAA;
1365    ZZZ;
1366 end Ada.Exceptions;