gcc/ada/a-except-2005.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                       A D A . E X C E P T I O N S                        --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2012, Free Software Foundation, Inc.         --
  10 --                                                                          --
  11 -- GNAT is free software;  you can  redistribute it  and/or modify it under --
  12 -- terms of the  GNU General Public License as published  by the Free Soft- --
  13 -- ware  Foundation;  either version 3,  or (at your option) any later ver- --
  14 -- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
  15 -- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
  16 -- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
  17 --                                                                          --
  18 -- As a special exception under Section 7 of GPL version 3, you are granted --
  19 -- additional permissions described in the GCC Runtime Library Exception,   --
  20 -- version 3.1, as published by the Free Software Foundation.               --
  21 --                                                                          --
  22 -- You should have received a copy of the GNU General Public License and    --
  23 -- a copy of the GCC Runtime Library Exception along with this program;     --
  24 -- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
  25 -- <http://www.gnu.org/licenses/>.                                          --
  26 --                                                                          --
  27 -- GNAT was originally developed  by the GNAT team at  New York University. --
  28 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  29 --                                                                          --
  30 ------------------------------------------------------------------------------
  31
  32 --  This version of Ada.Exceptions fully supports both Ada 95 and Ada 2005.
  33 --  It is used in all situations except for the build of the compiler and
  34 --  other basic tools. For these latter builds, we use an Ada 95-only version.
  35
  36 --  The reason for this splitting off of a separate version is that bootstrap
  37 --  compilers often will be used that do not support Ada 2005 features, and
  38 --  Ada.Exceptions is part of the compiler sources.
  39
  40 pragma Style_Checks (All_Checks);
  41 --  No subprogram ordering check, due to logical grouping
  42
  43 pragma Polling (Off);
  44 --  We must turn polling off for this unit, because otherwise we get
  45 --  elaboration circularities with System.Exception_Tables.
  46
  47 with System;                  use System;
  48 with System.Exceptions;       use System.Exceptions;
  49 with System.Exceptions_Debug; use System.Exceptions_Debug;
  50 with System.Standard_Library; use System.Standard_Library;
  51 with System.Soft_Links;       use System.Soft_Links;
  52 with System.WCh_Con;          use System.WCh_Con;
  53 with System.WCh_StW;          use System.WCh_StW;
  54
  55 package body Ada.Exceptions is
  56
  57    pragma Suppress (All_Checks);
  58    --  We definitely do not want exceptions occurring within this unit, or
  59    --  we are in big trouble. If an exceptional situation does occur, better
  60    --  that it not be raised, since raising it can cause confusing chaos.
  61
  62    -----------------------
  63    -- Local Subprograms --
  64    -----------------------
  65
  66    --  Note: the exported subprograms in this package body are called directly
  67    --  from C clients using the given external name, even though they are not
  68    --  technically visible in the Ada sense.
  69
  70    function Code_Address_For_AAA return System.Address;
  71    function Code_Address_For_ZZZ return System.Address;
  72    --  Return start and end of procedures in this package
  73    --
  74    --  These procedures are used to provide exclusion bounds in
  75    --  calls to Call_Chain at exception raise points from this unit. The
  76    --  purpose is to arrange for the exception tracebacks not to include
  77    --  frames from routines involved in the raise process, as these are
  78    --  meaningless from the user's standpoint.
  79    --
  80    --  For these bounds to be meaningful, we need to ensure that the object
  81    --  code for the routines involved in processing a raise is located after
  82    --  the object code Code_Address_For_AAA and before the object code
  83    --  Code_Address_For_ZZZ. This will indeed be the case as long as the
  84    --  following rules are respected:
  85    --
  86    --  1) The bodies of the subprograms involved in processing a raise
  87    --     are located after the body of Code_Address_For_AAA and before the
  88    --     body of Code_Address_For_ZZZ.
  89    --
  90    --  2) No pragma Inline applies to any of these subprograms, as this
  91    --     could delay the corresponding assembly output until the end of
  92    --     the unit.
  93
  94    procedure Call_Chain (Excep : EOA);
  95    --  Store up to Max_Tracebacks in Excep, corresponding to the current
  96    --  call chain.
  97
  98    function Image (Index : Integer) return String;
  99    --  Return string image corresponding to Index
 100
 101    procedure To_Stderr (S : String);
 102    pragma Export (Ada, To_Stderr, "__gnat_to_stderr");
 103    --  Little routine to output string to stderr that is also used
 104    --  in the tasking run time.
 105
 106    procedure To_Stderr (C : Character);
 107    pragma Inline (To_Stderr);
 108    pragma Export (Ada, To_Stderr, "__gnat_to_stderr_char");
 109    --  Little routine to output a character to stderr, used by some of
 110    --  the separate units below.
 111
 112    package Exception_Data is
 113
 114       ---------------------------------
 115       -- Exception messages routines --
 116       ---------------------------------
 117
 118       procedure Set_Exception_C_Msg
 119         (Excep  : EOA;
 120          Id     : Exception_Id;
 121          Msg1   : System.Address;
 122          Line   : Integer        := 0;
 123          Column : Integer        := 0;
 124          Msg2   : System.Address := System.Null_Address);
 125       --  This routine is called to setup the exception referenced by X
 126       --  to contain the indicated Id value and message. Msg1 is a null
 127       --  terminated string which is generated as the exception message. If
 128       --  line is non-zero, then a colon and the decimal representation of
 129       --  this integer is appended to the message. Ditto for Column. When Msg2
 130       --  is non-null, a space and this additional null terminated string is
 131       --  added to the message.
 132
 133       procedure Set_Exception_Msg
 134         (Excep   : EOA;
 135          Id      : Exception_Id;
 136          Message : String);
 137       --  This routine is called to setup the exception referenced by X
 138       --  to contain the indicated Id value and message. Message is a string
 139       --  which is generated as the exception message.
 140
 141       --------------------------------------
 142       -- Exception information subprogram --
 143       --------------------------------------
 144
 145       function Exception_Information (X : Exception_Occurrence) return String;
 146       --  The format of the exception information is as follows:
 147       --
 148       --    Exception_Name: <exception name> (as in Exception_Name)
 149       --    Message: <message> (only if Exception_Message is empty)
 150       --    PID=nnnn (only if != 0)
 151       --    Call stack traceback locations:  (only if at least one location)
 152       --    <0xyyyyyyyy 0xyyyyyyyy ...>      (is recorded)
 153       --
 154       --  The lines are separated by a ASCII.LF character.
 155       --  The nnnn is the partition Id given as decimal digits.
 156       --  The 0x... line represents traceback program counter locations, in
 157       --  execution order with the first one being the exception location. It
 158       --  is present only
 159       --
 160       --  The Exception_Name and Message lines are omitted in the abort
 161       --  signal case, since this is not really an exception.
 162
 163       --  !! If the format of the generated string is changed, please note
 164       --  !! that an equivalent modification to the routine String_To_EO must
 165       --  !! be made to preserve proper functioning of the stream attributes.
 166
 167       ---------------------------------------
 168       -- Exception backtracing subprograms --
 169       ---------------------------------------
 170
 171       --  What is automatically output when exception tracing is on is the
 172       --  usual exception information with the call chain backtrace possibly
 173       --  tailored by a backtrace decorator. Modifying Exception_Information
 174       --  itself is not a good idea because the decorated output is completely
 175       --  out of control and would break all our code related to the streaming
 176       --  of exceptions.  We then provide an alternative function to compute
 177       --  the possibly tailored output, which is equivalent if no decorator is
 178       --  currently set:
 179
 180       function Tailored_Exception_Information
 181         (X : Exception_Occurrence) return String;
 182       --  Exception information to be output in the case of automatic tracing
 183       --  requested through GNAT.Exception_Traces.
 184       --
 185       --  This is the same as Exception_Information if no backtrace decorator
 186       --  is currently in place. Otherwise, this is Exception_Information with
 187       --  the call chain raw addresses replaced by the result of a call to the
 188       --  current decorator provided with the call chain addresses.
 189
 190       pragma Export
 191         (Ada, Tailored_Exception_Information,
 192            "__gnat_tailored_exception_information");
 193       --  This is currently used by System.Tasking.Stages
 194
 195    end Exception_Data;
 196
 197    package Exception_Traces is
 198
 199       use Exception_Data;
 200       --  Imports Tailored_Exception_Information
 201
 202       ----------------------------------------------
 203       -- Run-Time Exception Notification Routines --
 204       ----------------------------------------------
 205
 206       --  These subprograms provide a common run-time interface to trigger the
 207       --  actions required when an exception is about to be propagated (e.g.
 208       --  user specified actions or output of exception information). They are
 209       --  exported to be usable by the Ada exception handling personality
 210       --  routine when the GCC 3 mechanism is used.
 211
 212       procedure Notify_Handled_Exception (Excep : EOA);
 213       pragma Export
 214         (C, Notify_Handled_Exception, "__gnat_notify_handled_exception");
 215       --  This routine is called for a handled occurrence is about to be
 216       --  propagated.
 217
 218       procedure Notify_Unhandled_Exception (Excep : EOA);
 219       pragma Export
 220         (C, Notify_Unhandled_Exception, "__gnat_notify_unhandled_exception");
 221       --  This routine is called when an unhandled occurrence is about to be
 222       --  propagated.
 223
 224       procedure Unhandled_Exception_Terminate (Excep : EOA);
 225       pragma No_Return (Unhandled_Exception_Terminate);
 226       --  This procedure is called to terminate execution following an
 227       --  unhandled exception. The exception information, including
 228       --  traceback if available is output, and execution is then
 229       --  terminated. Note that at the point where this routine is
 230       --  called, the stack has typically been destroyed.
 231
 232    end Exception_Traces;
 233
 234    package Exception_Propagation is
 235
 236       ------------------------------------
 237       -- Exception propagation routines --
 238       ------------------------------------
 239
 240       function Allocate_Occurrence return EOA;
 241       --  Allocate an exception occurence (as well as the machine occurence)
 242
 243       procedure Propagate_Exception (Excep : EOA);
 244       pragma No_Return (Propagate_Exception);
 245       --  This procedure propagates the exception represented by Excep
 246
 247    end Exception_Propagation;
 248
 249    package Stream_Attributes is
 250
 251       --------------------------------
 252       -- Stream attributes routines --
 253       --------------------------------
 254
 255       function EId_To_String (X : Exception_Id) return String;
 256       function String_To_EId (S : String) return Exception_Id;
 257       --  Functions for implementing Exception_Id stream attributes
 258
 259       function EO_To_String (X : Exception_Occurrence) return String;
 260       function String_To_EO (S : String) return Exception_Occurrence;
 261       --  Functions for implementing Exception_Occurrence stream
 262       --  attributes
 263
 264    end Stream_Attributes;
 265
 266    procedure Complete_Occurrence (X : EOA);
 267    --  Finish building the occurrence: save the call chain and notify the
 268    --  debugger.
 269
 270    procedure Complete_And_Propagate_Occurrence (X : EOA);
 271    pragma No_Return (Complete_And_Propagate_Occurrence);
 272    --  This is a simple wrapper to Complete_Occurrence and
 273    --  Exception_Propagation.Propagate_Exception.
 274
 275    function Create_Occurrence_From_Signal_Handler
 276      (E : Exception_Id;
 277       M : System.Address) return EOA;
 278    --  Create and build an exception occurrence using exception id E and
 279    --  nul-terminated message M.
 280
 281    function Create_Machine_Occurrence_From_Signal_Handler
 282      (E : Exception_Id;
 283       M : System.Address) return System.Address;
 284    pragma Export (C, Create_Machine_Occurrence_From_Signal_Handler,
 285                   "__gnat_create_machine_occurrence_from_signal_handler");
 286    --  Create and build an exception occurrence using exception id E and
 287    --  nul-terminated message M. Return the machine occurrence.
 288
 289    procedure Raise_Exception_No_Defer
 290      (E       : Exception_Id;
 291       Message : String := "");
 292    pragma Export
 293     (Ada, Raise_Exception_No_Defer,
 294      "ada__exceptions__raise_exception_no_defer");
 295    pragma No_Return (Raise_Exception_No_Defer);
 296    --  Similar to Raise_Exception, but with no abort deferral
 297
 298    procedure Raise_With_Msg (E : Exception_Id);
 299    pragma No_Return (Raise_With_Msg);
 300    pragma Export (C, Raise_With_Msg, "__gnat_raise_with_msg");
 301    --  Raises an exception with given exception id value. A message
 302    --  is associated with the raise, and has already been stored in the
 303    --  exception occurrence referenced by the Current_Excep in the TSD.
 304    --  Abort is deferred before the raise call.
 305
 306    procedure Raise_With_Location_And_Msg
 307      (E : Exception_Id;
 308       F : System.Address;
 309       L : Integer;
 310       C : Integer := 0;
 311       M : System.Address := System.Null_Address);
 312    pragma No_Return (Raise_With_Location_And_Msg);
 313    --  Raise an exception with given exception id value. A filename and line
 314    --  number is associated with the raise and is stored in the exception
 315    --  occurrence and in addition a column and a string message M may be
 316    --  appended to this (if not null/0).
 317
 318    procedure Raise_Constraint_Error
 319      (File : System.Address;
 320       Line : Integer);
 321    pragma No_Return (Raise_Constraint_Error);
 322    pragma Export
 323      (C, Raise_Constraint_Error, "__gnat_raise_constraint_error");
 324    --  Raise constraint error with file:line information
 325
 326    procedure Raise_Constraint_Error_Msg
 327      (File   : System.Address;
 328       Line   : Integer;
 329       Column : Integer;
 330       Msg    : System.Address);
 331    pragma No_Return (Raise_Constraint_Error_Msg);
 332    pragma Export
 333      (C, Raise_Constraint_Error_Msg, "__gnat_raise_constraint_error_msg");
 334    --  Raise constraint error with file:line:col + msg information
 335
 336    procedure Raise_Program_Error
 337      (File : System.Address;
 338       Line : Integer);
 339    pragma No_Return (Raise_Program_Error);
 340    pragma Export
 341      (C, Raise_Program_Error, "__gnat_raise_program_error");
 342    --  Raise program error with file:line information
 343
 344    procedure Raise_Program_Error_Msg
 345      (File : System.Address;
 346       Line : Integer;
 347       Msg  : System.Address);
 348    pragma No_Return (Raise_Program_Error_Msg);
 349    pragma Export
 350      (C, Raise_Program_Error_Msg, "__gnat_raise_program_error_msg");
 351    --  Raise program error with file:line + msg information
 352
 353    procedure Raise_Storage_Error
 354      (File : System.Address;
 355       Line : Integer);
 356    pragma No_Return (Raise_Storage_Error);
 357    pragma Export
 358      (C, Raise_Storage_Error, "__gnat_raise_storage_error");
 359    --  Raise storage error with file:line information
 360
 361    procedure Raise_Storage_Error_Msg
 362      (File : System.Address;
 363       Line : Integer;
 364       Msg  : System.Address);
 365    pragma No_Return (Raise_Storage_Error_Msg);
 366    pragma Export
 367      (C, Raise_Storage_Error_Msg, "__gnat_raise_storage_error_msg");
 368    --  Raise storage error with file:line + reason msg information
 369
 370    --  The exception raising process and the automatic tracing mechanism rely
 371    --  on some careful use of flags attached to the exception occurrence. The
 372    --  graph below illustrates the relations between the Raise_ subprograms
 373    --  and identifies the points where basic flags such as Exception_Raised
 374    --  are initialized.
 375    --
 376    --  (i) signs indicate the flags initialization points. R stands for Raise,
 377    --  W for With, and E for Exception.
 378    --
 379    --                   R_No_Msg    R_E   R_Pe  R_Ce  R_Se
 380    --                       |        |     |     |     |
 381    --                       +--+  +--+     +---+ | +---+
 382    --                          |  |            | | |
 383    --     R_E_No_Defer(i)    R_W_Msg(i)       R_W_Loc
 384    --           |               |              |   |
 385    --           +------------+  |  +-----------+   +--+
 386    --                        |  |  |                  |
 387    --                        |  |  |             Set_E_C_Msg(i)
 388    --                        |  |  |
 389    --            Complete_And_Propagate_Occurrence
 390
 391    procedure Reraise;
 392    pragma No_Return (Reraise);
 393    pragma Export (C, Reraise, "__gnat_reraise");
 394    --  Reraises the exception referenced by the Current_Excep field of
 395    --  the TSD (all fields of this exception occurrence are set). Abort
 396    --  is deferred before the reraise operation.
 397    --  Called from System.Tasking.RendezVous.Exceptional_Complete_RendezVous
 398
 399    procedure Transfer_Occurrence
 400      (Target : Exception_Occurrence_Access;
 401       Source : Exception_Occurrence);
 402    pragma Export (C, Transfer_Occurrence, "__gnat_transfer_occurrence");
 403    --  Called from s-tasren.adb:Local_Complete_RendezVous and
 404    --  s-tpobop.adb:Exceptional_Complete_Entry_Body to setup Target from
 405    --  Source as an exception to be propagated in the caller task. Target is
 406    --  expected to be a pointer to the fixed TSD occurrence for this task.
 407
 408    -----------------------------
 409    -- Run-Time Check Routines --
 410    -----------------------------
 411
 412    --  These routines raise a specific exception with a reason message
 413    --  attached. The parameters are the file name and line number in each
 414    --  case. The names are defined by Exp_Ch11.Get_RT_Exception_Name.
 415
 416    procedure Rcheck_CE_Access_Check
 417      (File : System.Address; Line : Integer);
 418    procedure Rcheck_CE_Null_Access_Parameter
 419      (File : System.Address; Line : Integer);
 420    procedure Rcheck_CE_Discriminant_Check
 421      (File : System.Address; Line : Integer);
 422    procedure Rcheck_CE_Divide_By_Zero
 423      (File : System.Address; Line : Integer);
 424    procedure Rcheck_CE_Explicit_Raise
 425      (File : System.Address; Line : Integer);
 426    procedure Rcheck_CE_Index_Check
 427      (File : System.Address; Line : Integer);
 428    procedure Rcheck_CE_Invalid_Data
 429      (File : System.Address; Line : Integer);
 430    procedure Rcheck_CE_Length_Check
 431      (File : System.Address; Line : Integer);
 432    procedure Rcheck_CE_Null_Exception_Id
 433      (File : System.Address; Line : Integer);
 434    procedure Rcheck_CE_Null_Not_Allowed
 435      (File : System.Address; Line : Integer);
 436    procedure Rcheck_CE_Overflow_Check
 437      (File : System.Address; Line : Integer);
 438    procedure Rcheck_CE_Partition_Check
 439      (File : System.Address; Line : Integer);
 440    procedure Rcheck_CE_Range_Check
 441      (File : System.Address; Line : Integer);
 442    procedure Rcheck_CE_Tag_Check
 443      (File : System.Address; Line : Integer);
 444    procedure Rcheck_PE_Access_Before_Elaboration
 445      (File : System.Address; Line : Integer);
 446    procedure Rcheck_PE_Accessibility_Check
 447      (File : System.Address; Line : Integer);
 448    procedure Rcheck_PE_Address_Of_Intrinsic
 449      (File : System.Address; Line : Integer);
 450    procedure Rcheck_PE_All_Guards_Closed
 451      (File : System.Address; Line : Integer);
 452    procedure Rcheck_PE_Bad_Predicated_Generic_Type
 453      (File : System.Address; Line : Integer);
 454    procedure Rcheck_PE_Current_Task_In_Entry_Body
 455      (File : System.Address; Line : Integer);
 456    procedure Rcheck_PE_Duplicated_Entry_Address
 457      (File : System.Address; Line : Integer);
 458    procedure Rcheck_PE_Explicit_Raise
 459      (File : System.Address; Line : Integer);
 460    procedure Rcheck_PE_Implicit_Return
 461      (File : System.Address; Line : Integer);
 462    procedure Rcheck_PE_Misaligned_Address_Value
 463      (File : System.Address; Line : Integer);
 464    procedure Rcheck_PE_Missing_Return
 465      (File : System.Address; Line : Integer);
 466    procedure Rcheck_PE_Overlaid_Controlled_Object
 467      (File : System.Address; Line : Integer);
 468    procedure Rcheck_PE_Potentially_Blocking_Operation
 469      (File : System.Address; Line : Integer);
 470    procedure Rcheck_PE_Stubbed_Subprogram_Called
 471      (File : System.Address; Line : Integer);
 472    procedure Rcheck_PE_Unchecked_Union_Restriction
 473      (File : System.Address; Line : Integer);
 474    procedure Rcheck_PE_Non_Transportable_Actual
 475      (File : System.Address; Line : Integer);
 476    procedure Rcheck_SE_Empty_Storage_Pool
 477      (File : System.Address; Line : Integer);
 478    procedure Rcheck_SE_Explicit_Raise
 479      (File : System.Address; Line : Integer);
 480    procedure Rcheck_SE_Infinite_Recursion
 481      (File : System.Address; Line : Integer);
 482    procedure Rcheck_SE_Object_Too_Large
 483      (File : System.Address; Line : Integer);
 484
 485    procedure Rcheck_CE_Access_Check_Ext
 486      (File : System.Address; Line, Column : Integer);
 487    procedure Rcheck_CE_Index_Check_Ext
 488      (File : System.Address; Line, Column, Index, First, Last : Integer);
 489    procedure Rcheck_CE_Invalid_Data_Ext
 490      (File : System.Address; Line, Column, Index, First, Last : Integer);
 491    procedure Rcheck_CE_Range_Check_Ext
 492      (File : System.Address; Line, Column, Index, First, Last : Integer);
 493
 494    procedure Rcheck_PE_Finalize_Raised_Exception
 495      (File : System.Address; Line : Integer);
 496    --  This routine is separated out because it has quite different behavior
 497    --  from the others. This is the "finalize/adjust raised exception". This
 498    --  subprogram is always called with abort deferred, unlike all other
 499    --  Rcheck_* routines, it needs to call Raise_Exception_No_Defer.
 500
 501    pragma Export (C, Rcheck_CE_Access_Check,
 502                   "__gnat_rcheck_CE_Access_Check");
 503    pragma Export (C, Rcheck_CE_Null_Access_Parameter,
 504                   "__gnat_rcheck_CE_Null_Access_Parameter");
 505    pragma Export (C, Rcheck_CE_Discriminant_Check,
 506                   "__gnat_rcheck_CE_Discriminant_Check");
 507    pragma Export (C, Rcheck_CE_Divide_By_Zero,
 508                   "__gnat_rcheck_CE_Divide_By_Zero");
 509    pragma Export (C, Rcheck_CE_Explicit_Raise,
 510                   "__gnat_rcheck_CE_Explicit_Raise");
 511    pragma Export (C, Rcheck_CE_Index_Check,
 512                   "__gnat_rcheck_CE_Index_Check");
 513    pragma Export (C, Rcheck_CE_Invalid_Data,
 514                   "__gnat_rcheck_CE_Invalid_Data");
 515    pragma Export (C, Rcheck_CE_Length_Check,
 516                   "__gnat_rcheck_CE_Length_Check");
 517    pragma Export (C, Rcheck_CE_Null_Exception_Id,
 518                   "__gnat_rcheck_CE_Null_Exception_Id");
 519    pragma Export (C, Rcheck_CE_Null_Not_Allowed,
 520                   "__gnat_rcheck_CE_Null_Not_Allowed");
 521    pragma Export (C, Rcheck_CE_Overflow_Check,
 522                   "__gnat_rcheck_CE_Overflow_Check");
 523    pragma Export (C, Rcheck_CE_Partition_Check,
 524                   "__gnat_rcheck_CE_Partition_Check");
 525    pragma Export (C, Rcheck_CE_Range_Check,
 526                   "__gnat_rcheck_CE_Range_Check");
 527    pragma Export (C, Rcheck_CE_Tag_Check,
 528                   "__gnat_rcheck_CE_Tag_Check");
 529    pragma Export (C, Rcheck_PE_Access_Before_Elaboration,
 530                   "__gnat_rcheck_PE_Access_Before_Elaboration");
 531    pragma Export (C, Rcheck_PE_Accessibility_Check,
 532                   "__gnat_rcheck_PE_Accessibility_Check");
 533    pragma Export (C, Rcheck_PE_Address_Of_Intrinsic,
 534                   "__gnat_rcheck_PE_Address_Of_Intrinsic");
 535    pragma Export (C, Rcheck_PE_All_Guards_Closed,
 536                   "__gnat_rcheck_PE_All_Guards_Closed");
 537    pragma Export (C, Rcheck_PE_Bad_Predicated_Generic_Type,
 538                   "__gnat_rcheck_PE_Bad_Predicated_Generic_Type");
 539    pragma Export (C, Rcheck_PE_Current_Task_In_Entry_Body,
 540                   "__gnat_rcheck_PE_Current_Task_In_Entry_Body");
 541    pragma Export (C, Rcheck_PE_Duplicated_Entry_Address,
 542                   "__gnat_rcheck_PE_Duplicated_Entry_Address");
 543    pragma Export (C, Rcheck_PE_Explicit_Raise,
 544                   "__gnat_rcheck_PE_Explicit_Raise");
 545    pragma Export (C, Rcheck_PE_Finalize_Raised_Exception,
 546                   "__gnat_rcheck_PE_Finalize_Raised_Exception");
 547    pragma Export (C, Rcheck_PE_Implicit_Return,
 548                   "__gnat_rcheck_PE_Implicit_Return");
 549    pragma Export (C, Rcheck_PE_Misaligned_Address_Value,
 550                   "__gnat_rcheck_PE_Misaligned_Address_Value");
 551    pragma Export (C, Rcheck_PE_Missing_Return,
 552                   "__gnat_rcheck_PE_Missing_Return");
 553    pragma Export (C, Rcheck_PE_Overlaid_Controlled_Object,
 554                   "__gnat_rcheck_PE_Overlaid_Controlled_Object");
 555    pragma Export (C, Rcheck_PE_Potentially_Blocking_Operation,
 556                   "__gnat_rcheck_PE_Potentially_Blocking_Operation");
 557    pragma Export (C, Rcheck_PE_Stubbed_Subprogram_Called,
 558                   "__gnat_rcheck_PE_Stubbed_Subprogram_Called");
 559    pragma Export (C, Rcheck_PE_Unchecked_Union_Restriction,
 560                   "__gnat_rcheck_PE_Unchecked_Union_Restriction");
 561    pragma Export (C, Rcheck_PE_Non_Transportable_Actual,
 562                   "__gnat_rcheck_PE_Non_Transportable_Actual");
 563    pragma Export (C, Rcheck_SE_Empty_Storage_Pool,
 564                   "__gnat_rcheck_SE_Empty_Storage_Pool");
 565    pragma Export (C, Rcheck_SE_Explicit_Raise,
 566                   "__gnat_rcheck_SE_Explicit_Raise");
 567    pragma Export (C, Rcheck_SE_Infinite_Recursion,
 568                   "__gnat_rcheck_SE_Infinite_Recursion");
 569    pragma Export (C, Rcheck_SE_Object_Too_Large,
 570                   "__gnat_rcheck_SE_Object_Too_Large");
 571
 572    pragma Export (C, Rcheck_CE_Access_Check_Ext,
 573                   "__gnat_rcheck_CE_Access_Check_ext");
 574    pragma Export (C, Rcheck_CE_Index_Check_Ext,
 575                   "__gnat_rcheck_CE_Index_Check_ext");
 576    pragma Export (C, Rcheck_CE_Invalid_Data_Ext,
 577                   "__gnat_rcheck_CE_Invalid_Data_ext");
 578    pragma Export (C, Rcheck_CE_Range_Check_Ext,
 579                   "__gnat_rcheck_CE_Range_Check_ext");
 580
 581    --  None of these procedures ever returns (they raise an exception!). By
 582    --  using pragma No_Return, we ensure that any junk code after the call,
 583    --  such as normal return epilog stuff, can be eliminated).
 584
 585    pragma No_Return (Rcheck_CE_Access_Check);
 586    pragma No_Return (Rcheck_CE_Null_Access_Parameter);
 587    pragma No_Return (Rcheck_CE_Discriminant_Check);
 588    pragma No_Return (Rcheck_CE_Divide_By_Zero);
 589    pragma No_Return (Rcheck_CE_Explicit_Raise);
 590    pragma No_Return (Rcheck_CE_Index_Check);
 591    pragma No_Return (Rcheck_CE_Invalid_Data);
 592    pragma No_Return (Rcheck_CE_Length_Check);
 593    pragma No_Return (Rcheck_CE_Null_Exception_Id);
 594    pragma No_Return (Rcheck_CE_Null_Not_Allowed);
 595    pragma No_Return (Rcheck_CE_Overflow_Check);
 596    pragma No_Return (Rcheck_CE_Partition_Check);
 597    pragma No_Return (Rcheck_CE_Range_Check);
 598    pragma No_Return (Rcheck_CE_Tag_Check);
 599    pragma No_Return (Rcheck_PE_Access_Before_Elaboration);
 600    pragma No_Return (Rcheck_PE_Accessibility_Check);
 601    pragma No_Return (Rcheck_PE_Address_Of_Intrinsic);
 602    pragma No_Return (Rcheck_PE_All_Guards_Closed);
 603    pragma No_Return (Rcheck_PE_Bad_Predicated_Generic_Type);
 604    pragma No_Return (Rcheck_PE_Current_Task_In_Entry_Body);
 605    pragma No_Return (Rcheck_PE_Duplicated_Entry_Address);
 606    pragma No_Return (Rcheck_PE_Explicit_Raise);
 607    pragma No_Return (Rcheck_PE_Implicit_Return);
 608    pragma No_Return (Rcheck_PE_Misaligned_Address_Value);
 609    pragma No_Return (Rcheck_PE_Missing_Return);
 610    pragma No_Return (Rcheck_PE_Overlaid_Controlled_Object);
 611    pragma No_Return (Rcheck_PE_Potentially_Blocking_Operation);
 612    pragma No_Return (Rcheck_PE_Stubbed_Subprogram_Called);
 613    pragma No_Return (Rcheck_PE_Unchecked_Union_Restriction);
 614    pragma No_Return (Rcheck_PE_Non_Transportable_Actual);
 615    pragma No_Return (Rcheck_PE_Finalize_Raised_Exception);
 616    pragma No_Return (Rcheck_SE_Empty_Storage_Pool);
 617    pragma No_Return (Rcheck_SE_Explicit_Raise);
 618    pragma No_Return (Rcheck_SE_Infinite_Recursion);
 619    pragma No_Return (Rcheck_SE_Object_Too_Large);
 620
 621    pragma No_Return (Rcheck_CE_Access_Check_Ext);
 622    pragma No_Return (Rcheck_CE_Index_Check_Ext);
 623    pragma No_Return (Rcheck_CE_Invalid_Data_Ext);
 624    pragma No_Return (Rcheck_CE_Range_Check_Ext);
 625
 626    ---------------------------------------------
 627    -- Reason Strings for Run-Time Check Calls --
 628    ---------------------------------------------
 629
 630    --  These strings are null-terminated and are used by Rcheck_nn. The
 631    --  strings correspond to the definitions for Types.RT_Exception_Code.
 632
 633    use ASCII;
 634
 635    Rmsg_00 : constant String := "access check failed"              & NUL;
 636    Rmsg_01 : constant String := "access parameter is null"         & NUL;
 637    Rmsg_02 : constant String := "discriminant check failed"        & NUL;
 638    Rmsg_03 : constant String := "divide by zero"                   & NUL;
 639    Rmsg_04 : constant String := "explicit raise"                   & NUL;
 640    Rmsg_05 : constant String := "index check failed"               & NUL;
 641    Rmsg_06 : constant String := "invalid data"                     & NUL;
 642    Rmsg_07 : constant String := "length check failed"              & NUL;
 643    Rmsg_08 : constant String := "null Exception_Id"                & NUL;
 644    Rmsg_09 : constant String := "null-exclusion check failed"      & NUL;
 645    Rmsg_10 : constant String := "overflow check failed"            & NUL;
 646    Rmsg_11 : constant String := "partition check failed"           & NUL;
 647    Rmsg_12 : constant String := "range check failed"               & NUL;
 648    Rmsg_13 : constant String := "tag check failed"                 & NUL;
 649    Rmsg_14 : constant String := "access before elaboration"        & NUL;
 650    Rmsg_15 : constant String := "accessibility check failed"       & NUL;
 651    Rmsg_16 : constant String := "attempt to take address of"       &
 652                                 " intrinsic subprogram"            & NUL;
 653    Rmsg_17 : constant String := "all guards closed"                & NUL;
 654    Rmsg_18 : constant String := "improper use of generic subtype"  &
 655                                 " with predicate"                  & NUL;
 656    Rmsg_19 : constant String := "Current_Task referenced in entry" &
 657                                 " body"                            & NUL;
 658    Rmsg_20 : constant String := "duplicated entry address"         & NUL;
 659    Rmsg_21 : constant String := "explicit raise"                   & NUL;
 660    Rmsg_22 : constant String := "finalize/adjust raised exception" & NUL;
 661    Rmsg_23 : constant String := "implicit return with No_Return"   & NUL;
 662    Rmsg_24 : constant String := "misaligned address value"         & NUL;
 663    Rmsg_25 : constant String := "missing return"                   & NUL;
 664    Rmsg_26 : constant String := "overlaid controlled object"       & NUL;
 665    Rmsg_27 : constant String := "potentially blocking operation"   & NUL;
 666    Rmsg_28 : constant String := "stubbed subprogram called"        & NUL;
 667    Rmsg_29 : constant String := "unchecked union restriction"      & NUL;
 668    Rmsg_30 : constant String := "actual/returned class-wide"       &
 669                                 " value not transportable"         & NUL;
 670    Rmsg_31 : constant String := "empty storage pool"               & NUL;
 671    Rmsg_32 : constant String := "explicit raise"                   & NUL;
 672    Rmsg_33 : constant String := "infinite recursion"               & NUL;
 673    Rmsg_34 : constant String := "object too large"                 & NUL;
 674
 675    -----------------------
 676    -- Polling Interface --
 677    -----------------------
 678
 679    type Unsigned is mod 2 ** 32;
 680
 681    Counter : Unsigned := 0;
 682    pragma Warnings (Off, Counter);
 683    --  This counter is provided for convenience. It can be used in Poll to
 684    --  perform periodic but not systematic operations.
 685
 686    procedure Poll is separate;
 687    --  The actual polling routine is separate, so that it can easily
 688    --  be replaced with a target dependent version.
 689
 690    --------------------------
 691    -- Code_Address_For_AAA --
 692    --------------------------
 693
 694    --  This function gives us the start of the PC range for addresses
 695    --  within the exception unit itself. We hope that gigi/gcc keep all the
 696    --  procedures in their original order!
 697
 698    function Code_Address_For_AAA return System.Address is
 699    begin
 700       --  We are using a label instead of merely using
 701       --  Code_Address_For_AAA'Address because on some platforms the latter
 702       --  does not yield the address we want, but the address of a stub or of
 703       --  a descriptor instead. This is the case at least on Alpha-VMS and
 704       --  PA-HPUX.
 705
 706       <<Start_Of_AAA>>
 707       return Start_Of_AAA'Address;
 708    end Code_Address_For_AAA;
 709
 710    ----------------
 711    -- Call_Chain --
 712    ----------------
 713
 714    procedure Call_Chain (Excep : EOA) is separate;
 715    --  The actual Call_Chain routine is separate, so that it can easily
 716    --  be dummied out when no exception traceback information is needed.
 717
 718    ------------------------------
 719    -- Current_Target_Exception --
 720    ------------------------------
 721
 722    function Current_Target_Exception return Exception_Occurrence is
 723    begin
 724       return Null_Occurrence;
 725    end Current_Target_Exception;
 726
 727    -------------------
 728    -- EId_To_String --
 729    -------------------
 730
 731    function EId_To_String (X : Exception_Id) return String
 732      renames Stream_Attributes.EId_To_String;
 733
 734    ------------------
 735    -- EO_To_String --
 736    ------------------
 737
 738    --  We use the null string to represent the null occurrence, otherwise
 739    --  we output the Exception_Information string for the occurrence.
 740
 741    function EO_To_String (X : Exception_Occurrence) return String
 742      renames Stream_Attributes.EO_To_String;
 743
 744    ------------------------
 745    -- Exception_Identity --
 746    ------------------------
 747
 748    function Exception_Identity
 749      (X : Exception_Occurrence) return Exception_Id
 750    is
 751    begin
 752       --  Note that the following test used to be here for the original
 753       --  Ada 95 semantics, but these were modified by AI-241 to require
 754       --  returning Null_Id instead of raising Constraint_Error.
 755
 756       --  if X.Id = Null_Id then
 757       --     raise Constraint_Error;
 758       --  end if;
 759
 760       return X.Id;
 761    end Exception_Identity;
 762
 763    ---------------------------
 764    -- Exception_Information --
 765    ---------------------------
 766
 767    function Exception_Information (X : Exception_Occurrence) return String is
 768    begin
 769       if X.Id = Null_Id then
 770          raise Constraint_Error;
 771       end if;
 772
 773       return Exception_Data.Exception_Information (X);
 774    end Exception_Information;
 775
 776    -----------------------
 777    -- Exception_Message --
 778    -----------------------
 779
 780    function Exception_Message (X : Exception_Occurrence) return String is
 781    begin
 782       if X.Id = Null_Id then
 783          raise Constraint_Error;
 784       end if;
 785
 786       return X.Msg (1 .. X.Msg_Length);
 787    end Exception_Message;
 788
 789    --------------------
 790    -- Exception_Name --
 791    --------------------
 792
 793    function Exception_Name (Id : Exception_Id) return String is
 794    begin
 795       if Id = null then
 796          raise Constraint_Error;
 797       end if;
 798
 799       return To_Ptr (Id.Full_Name) (1 .. Id.Name_Length - 1);
 800    end Exception_Name;
 801
 802    function Exception_Name (X : Exception_Occurrence) return String is
 803    begin
 804       return Exception_Name (X.Id);
 805    end Exception_Name;
 806
 807    ---------------------------
 808    -- Exception_Name_Simple --
 809    ---------------------------
 810
 811    function Exception_Name_Simple (X : Exception_Occurrence) return String is
 812       Name : constant String := Exception_Name (X);
 813       P    : Natural;
 814
 815    begin
 816       P := Name'Length;
 817       while P > 1 loop
 818          exit when Name (P - 1) = '.';
 819          P := P - 1;
 820       end loop;
 821
 822       --  Return result making sure lower bound is 1
 823
 824       declare
 825          subtype Rname is String (1 .. Name'Length - P + 1);
 826       begin
 827          return Rname (Name (P .. Name'Length));
 828       end;
 829    end Exception_Name_Simple;
 830
 831    --------------------
 832    -- Exception_Data --
 833    --------------------
 834
 835    package body Exception_Data is separate;
 836    --  This package can be easily dummied out if we do not want the
 837    --  basic support for exception messages (such as in Ada 83).
 838
 839    ---------------------------
 840    -- Exception_Propagation --
 841    ---------------------------
 842
 843    package body Exception_Propagation is separate;
 844    --  Depending on the actual exception mechanism used (front-end or
 845    --  back-end based), the implementation will differ, which is why this
 846    --  package is separated.
 847
 848    ----------------------
 849    -- Exception_Traces --
 850    ----------------------
 851
 852    package body Exception_Traces is separate;
 853    --  Depending on the underlying support for IO the implementation
 854    --  will differ. Moreover we would like to dummy out this package
 855    --  in case we do not want any exception tracing support. This is
 856    --  why this package is separated.
 857
 858    -----------
 859    -- Image --
 860    -----------
 861
 862    function Image (Index : Integer) return String is
 863       Result : constant String := Integer'Image (Index);
 864    begin
 865       if Result (1) = ' ' then
 866          return Result (2 .. Result'Last);
 867       else
 868          return Result;
 869       end if;
 870    end Image;
 871
 872    -----------------------
 873    -- Stream Attributes --
 874    -----------------------
 875
 876    package body Stream_Attributes is separate;
 877    --  This package can be easily dummied out if we do not want the
 878    --  support for streaming Exception_Ids and Exception_Occurrences.
 879
 880    ----------------------------
 881    -- Raise_Constraint_Error --
 882    ----------------------------
 883
 884    procedure Raise_Constraint_Error (File : System.Address; Line : Integer) is
 885    begin
 886       Raise_With_Location_And_Msg (Constraint_Error_Def'Access, File, Line);
 887    end Raise_Constraint_Error;
 888
 889    --------------------------------
 890    -- Raise_Constraint_Error_Msg --
 891    --------------------------------
 892
 893    procedure Raise_Constraint_Error_Msg
 894      (File   : System.Address;
 895       Line   : Integer;
 896       Column : Integer;
 897       Msg    : System.Address)
 898    is
 899    begin
 900       Raise_With_Location_And_Msg
 901         (Constraint_Error_Def'Access, File, Line, Column, Msg);
 902    end Raise_Constraint_Error_Msg;
 903
 904    -------------------------
 905    -- Complete_Occurrence --
 906    -------------------------
 907
 908    procedure Complete_Occurrence (X : EOA) is
 909    begin
 910       --  Compute the backtrace for this occurrence if the corresponding
 911       --  binder option has been set. Call_Chain takes care of the reraise
 912       --  case.
 913
 914       --  ??? Using Call_Chain here means we are going to walk up the stack
 915       --  once only for backtracing purposes before doing it again for the
 916       --  propagation per se.
 917
 918       --  The first inspection is much lighter, though, as it only requires
 919       --  partial unwinding of each frame. Additionally, although we could use
 920       --  the personality routine to record the addresses while propagating,
 921       --  this method has two drawbacks:
 922
 923       --  1) the trace is incomplete if the exception is handled since we
 924       --  don't walk past the frame with the handler,
 925
 926       --    and
 927
 928       --  2) we would miss the frames for which our personality routine is not
 929       --  called, e.g. if C or C++ calls are on the way.
 930
 931       Call_Chain (X);
 932
 933       --  Notify the debugger
 934       Debug_Raise_Exception (E => SSL.Exception_Data_Ptr (X.Id));
 935    end Complete_Occurrence;
 936
 937    ---------------------------------------
 938    -- Complete_And_Propagate_Occurrence --
 939    ---------------------------------------
 940
 941    procedure Complete_And_Propagate_Occurrence (X : EOA) is
 942    begin
 943       Complete_Occurrence (X);
 944       Exception_Propagation.Propagate_Exception (X);
 945    end Complete_And_Propagate_Occurrence;
 946
 947    ---------------------
 948    -- Raise_Exception --
 949    ---------------------
 950
 951    procedure Raise_Exception
 952      (E       : Exception_Id;
 953       Message : String := "")
 954    is
 955       EF : Exception_Id := E;
 956    begin
 957       --  Raise CE if E = Null_ID (AI-446)
 958
 959       if E = null then
 960          EF := Constraint_Error'Identity;
 961       end if;
 962
 963       --  Go ahead and raise appropriate exception
 964
 965       Raise_Exception_Always (EF, Message);
 966    end Raise_Exception;
 967
 968    ----------------------------
 969    -- Raise_Exception_Always --
 970    ----------------------------
 971
 972    procedure Raise_Exception_Always
 973      (E       : Exception_Id;
 974       Message : String := "")
 975    is
 976       X : constant EOA := Exception_Propagation.Allocate_Occurrence;
 977    begin
 978       Exception_Data.Set_Exception_Msg (X, E, Message);
 979       if not ZCX_By_Default then
 980          Abort_Defer.all;
 981       end if;
 982       Complete_And_Propagate_Occurrence (X);
 983    end Raise_Exception_Always;
 984
 985    ------------------------------
 986    -- Raise_Exception_No_Defer --
 987    ------------------------------
 988
 989    procedure Raise_Exception_No_Defer
 990      (E       : Exception_Id;
 991       Message : String := "")
 992    is
 993       X : constant EOA := Exception_Propagation.Allocate_Occurrence;
 994    begin
 995       Exception_Data.Set_Exception_Msg (X, E, Message);
 996
 997       --  Do not call Abort_Defer.all, as specified by the spec
 998
 999       Complete_And_Propagate_Occurrence (X);
1000    end Raise_Exception_No_Defer;
1001
1002    -------------------------------------
1003    -- Raise_From_Controlled_Operation --
1004    -------------------------------------
1005
1006    procedure Raise_From_Controlled_Operation
1007      (X : Ada.Exceptions.Exception_Occurrence)
1008    is
1009       Prefix             : constant String := "adjust/finalize raised ";
1010       Orig_Msg           : constant String := Exception_Message (X);
1011       Orig_Prefix_Length : constant Natural :=
1012         Integer'Min (Prefix'Length, Orig_Msg'Length);
1013       Orig_Prefix        : String renames Orig_Msg
1014         (Orig_Msg'First ..
1015          Orig_Msg'First + Orig_Prefix_Length - 1);
1016    begin
1017       --  Message already has the proper prefix, just re-raise
1018
1019       if Orig_Prefix = Prefix then
1020          Raise_Exception_No_Defer
1021            (E       => Program_Error'Identity,
1022             Message => Orig_Msg);
1023
1024       else
1025          declare
1026             New_Msg  : constant String := Prefix & Exception_Name (X);
1027
1028          begin
1029             --  No message present, just provide our own
1030
1031             if Orig_Msg = "" then
1032                Raise_Exception_No_Defer
1033                  (E       => Program_Error'Identity,
1034                   Message => New_Msg);
1035
1036             --  Message present, add informational prefix
1037
1038             else
1039                Raise_Exception_No_Defer
1040                  (E       => Program_Error'Identity,
1041                   Message => New_Msg & ": " & Orig_Msg);
1042             end if;
1043          end;
1044       end if;
1045    end Raise_From_Controlled_Operation;
1046
1047    -------------------------------------------
1048    -- Create_Occurrence_From_Signal_Handler --
1049    -------------------------------------------
1050
1051    function Create_Occurrence_From_Signal_Handler
1052      (E : Exception_Id;
1053       M : System.Address) return EOA
1054    is
1055       X : constant EOA := Exception_Propagation.Allocate_Occurrence;
1056
1057    begin
1058       Exception_Data.Set_Exception_C_Msg (X, E, M);
1059
1060       if not ZCX_By_Default then
1061          Abort_Defer.all;
1062       end if;
1063
1064       Complete_Occurrence (X);
1065       return X;
1066    end Create_Occurrence_From_Signal_Handler;
1067
1068    ---------------------------------------------------
1069    -- Create_Machine_Occurrence_From_Signal_Handler --
1070    ---------------------------------------------------
1071
1072    function Create_Machine_Occurrence_From_Signal_Handler
1073      (E : Exception_Id;
1074       M : System.Address) return System.Address
1075    is
1076    begin
1077       return Create_Occurrence_From_Signal_Handler (E, M).Machine_Occurrence;
1078    end Create_Machine_Occurrence_From_Signal_Handler;
1079
1080    -------------------------------
1081    -- Raise_From_Signal_Handler --
1082    -------------------------------
1083
1084    procedure Raise_From_Signal_Handler
1085      (E : Exception_Id;
1086       M : System.Address)
1087    is
1088    begin
1089       Exception_Propagation.Propagate_Exception
1090         (Create_Occurrence_From_Signal_Handler (E, M));
1091    end Raise_From_Signal_Handler;
1092
1093    -------------------------
1094    -- Raise_Program_Error --
1095    -------------------------
1096
1097    procedure Raise_Program_Error
1098      (File : System.Address;
1099       Line : Integer)
1100    is
1101    begin
1102       Raise_With_Location_And_Msg (Program_Error_Def'Access, File, Line);
1103    end Raise_Program_Error;
1104
1105    -----------------------------
1106    -- Raise_Program_Error_Msg --
1107    -----------------------------
1108
1109    procedure Raise_Program_Error_Msg
1110      (File : System.Address;
1111       Line : Integer;
1112       Msg  : System.Address)
1113    is
1114    begin
1115       Raise_With_Location_And_Msg
1116         (Program_Error_Def'Access, File, Line, M => Msg);
1117    end Raise_Program_Error_Msg;
1118
1119    -------------------------
1120    -- Raise_Storage_Error --
1121    -------------------------
1122
1123    procedure Raise_Storage_Error
1124      (File : System.Address;
1125       Line : Integer)
1126    is
1127    begin
1128       Raise_With_Location_And_Msg (Storage_Error_Def'Access, File, Line);
1129    end Raise_Storage_Error;
1130
1131    -----------------------------
1132    -- Raise_Storage_Error_Msg --
1133    -----------------------------
1134
1135    procedure Raise_Storage_Error_Msg
1136      (File : System.Address;
1137       Line : Integer;
1138       Msg  : System.Address)
1139    is
1140    begin
1141       Raise_With_Location_And_Msg
1142         (Storage_Error_Def'Access, File, Line, M => Msg);
1143    end Raise_Storage_Error_Msg;
1144
1145    ---------------------------------
1146    -- Raise_With_Location_And_Msg --
1147    ---------------------------------
1148
1149    procedure Raise_With_Location_And_Msg
1150      (E : Exception_Id;
1151       F : System.Address;
1152       L : Integer;
1153       C : Integer := 0;
1154       M : System.Address := System.Null_Address)
1155    is
1156       X : constant EOA := Exception_Propagation.Allocate_Occurrence;
1157    begin
1158       Exception_Data.Set_Exception_C_Msg (X, E, F, L, C, M);
1159
1160       if not ZCX_By_Default then
1161          Abort_Defer.all;
1162       end if;
1163
1164       Complete_And_Propagate_Occurrence (X);
1165    end Raise_With_Location_And_Msg;
1166
1167    --------------------
1168    -- Raise_With_Msg --
1169    --------------------
1170
1171    procedure Raise_With_Msg (E : Exception_Id) is
1172       Excep : constant EOA := Exception_Propagation.Allocate_Occurrence;
1173       Ex    : constant Exception_Occurrence_Access := Get_Current_Excep.all;
1174    begin
1175       Excep.Exception_Raised := False;
1176       Excep.Id               := E;
1177       Excep.Num_Tracebacks   := 0;
1178       Excep.Pid              := Local_Partition_ID;
1179
1180       --  Copy the message from the current exception
1181       --  Change the interface to be called with an occurrence ???
1182
1183       Excep.Msg_Length                  := Ex.Msg_Length;
1184       Excep.Msg (1 .. Excep.Msg_Length) := Ex.Msg (1 .. Ex.Msg_Length);
1185
1186       --  The following is a common pattern, should be abstracted
1187       --  into a procedure call ???
1188
1189       if not ZCX_By_Default then
1190          Abort_Defer.all;
1191       end if;
1192
1193       Complete_And_Propagate_Occurrence (Excep);
1194    end Raise_With_Msg;
1195
1196    --------------------------------------
1197    -- Calls to Run-Time Check Routines --
1198    --------------------------------------
1199
1200    procedure Rcheck_CE_Access_Check
1201      (File : System.Address; Line : Integer)
1202    is
1203    begin
1204       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_00'Address);
1205    end Rcheck_CE_Access_Check;
1206
1207    procedure Rcheck_CE_Null_Access_Parameter
1208      (File : System.Address; Line : Integer)
1209    is
1210    begin
1211       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_01'Address);
1212    end Rcheck_CE_Null_Access_Parameter;
1213
1214    procedure Rcheck_CE_Discriminant_Check
1215      (File : System.Address; Line : Integer)
1216    is
1217    begin
1218       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_02'Address);
1219    end Rcheck_CE_Discriminant_Check;
1220
1221    procedure Rcheck_CE_Divide_By_Zero
1222      (File : System.Address; Line : Integer)
1223    is
1224    begin
1225       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_03'Address);
1226    end Rcheck_CE_Divide_By_Zero;
1227
1228    procedure Rcheck_CE_Explicit_Raise
1229      (File : System.Address; Line : Integer)
1230    is
1231    begin
1232       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_04'Address);
1233    end Rcheck_CE_Explicit_Raise;
1234
1235    procedure Rcheck_CE_Index_Check
1236      (File : System.Address; Line : Integer)
1237    is
1238    begin
1239       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_05'Address);
1240    end Rcheck_CE_Index_Check;
1241
1242    procedure Rcheck_CE_Invalid_Data
1243      (File : System.Address; Line : Integer)
1244    is
1245    begin
1246       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_06'Address);
1247    end Rcheck_CE_Invalid_Data;
1248
1249    procedure Rcheck_CE_Length_Check
1250      (File : System.Address; Line : Integer)
1251    is
1252    begin
1253       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_07'Address);
1254    end Rcheck_CE_Length_Check;
1255
1256    procedure Rcheck_CE_Null_Exception_Id
1257      (File : System.Address; Line : Integer)
1258    is
1259    begin
1260       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_08'Address);
1261    end Rcheck_CE_Null_Exception_Id;
1262
1263    procedure Rcheck_CE_Null_Not_Allowed
1264      (File : System.Address; Line : Integer)
1265    is
1266    begin
1267       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_09'Address);
1268    end Rcheck_CE_Null_Not_Allowed;
1269
1270    procedure Rcheck_CE_Overflow_Check
1271      (File : System.Address; Line : Integer)
1272    is
1273    begin
1274       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_10'Address);
1275    end Rcheck_CE_Overflow_Check;
1276
1277    procedure Rcheck_CE_Partition_Check
1278      (File : System.Address; Line : Integer)
1279    is
1280    begin
1281       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_11'Address);
1282    end Rcheck_CE_Partition_Check;
1283
1284    procedure Rcheck_CE_Range_Check
1285      (File : System.Address; Line : Integer)
1286    is
1287    begin
1288       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_12'Address);
1289    end Rcheck_CE_Range_Check;
1290
1291    procedure Rcheck_CE_Tag_Check
1292      (File : System.Address; Line : Integer)
1293    is
1294    begin
1295       Raise_Constraint_Error_Msg (File, Line, 0, Rmsg_13'Address);
1296    end Rcheck_CE_Tag_Check;
1297
1298    procedure Rcheck_PE_Access_Before_Elaboration
1299      (File : System.Address; Line : Integer)
1300    is
1301    begin
1302       Raise_Program_Error_Msg (File, Line, Rmsg_14'Address);
1303    end Rcheck_PE_Access_Before_Elaboration;
1304
1305    procedure Rcheck_PE_Accessibility_Check
1306      (File : System.Address; Line : Integer)
1307    is
1308    begin
1309       Raise_Program_Error_Msg (File, Line, Rmsg_15'Address);
1310    end Rcheck_PE_Accessibility_Check;
1311
1312    procedure Rcheck_PE_Address_Of_Intrinsic
1313      (File : System.Address; Line : Integer)
1314    is
1315    begin
1316       Raise_Program_Error_Msg (File, Line, Rmsg_16'Address);
1317    end Rcheck_PE_Address_Of_Intrinsic;
1318
1319    procedure Rcheck_PE_All_Guards_Closed
1320      (File : System.Address; Line : Integer)
1321    is
1322    begin
1323       Raise_Program_Error_Msg (File, Line, Rmsg_17'Address);
1324    end Rcheck_PE_All_Guards_Closed;
1325
1326    procedure Rcheck_PE_Bad_Predicated_Generic_Type
1327      (File : System.Address; Line : Integer)
1328    is
1329    begin
1330       Raise_Program_Error_Msg (File, Line, Rmsg_18'Address);
1331    end Rcheck_PE_Bad_Predicated_Generic_Type;
1332
1333    procedure Rcheck_PE_Current_Task_In_Entry_Body
1334      (File : System.Address; Line : Integer)
1335    is
1336    begin
1337       Raise_Program_Error_Msg (File, Line, Rmsg_19'Address);
1338    end Rcheck_PE_Current_Task_In_Entry_Body;
1339
1340    procedure Rcheck_PE_Duplicated_Entry_Address
1341      (File : System.Address; Line : Integer)
1342    is
1343    begin
1344       Raise_Program_Error_Msg (File, Line, Rmsg_20'Address);
1345    end Rcheck_PE_Duplicated_Entry_Address;
1346
1347    procedure Rcheck_PE_Explicit_Raise
1348      (File : System.Address; Line : Integer)
1349    is
1350    begin
1351       Raise_Program_Error_Msg (File, Line, Rmsg_21'Address);
1352    end Rcheck_PE_Explicit_Raise;
1353
1354    procedure Rcheck_PE_Implicit_Return
1355      (File : System.Address; Line : Integer)
1356    is
1357    begin
1358       Raise_Program_Error_Msg (File, Line, Rmsg_23'Address);
1359    end Rcheck_PE_Implicit_Return;
1360
1361    procedure Rcheck_PE_Misaligned_Address_Value
1362      (File : System.Address; Line : Integer)
1363    is
1364    begin
1365       Raise_Program_Error_Msg (File, Line, Rmsg_24'Address);
1366    end Rcheck_PE_Misaligned_Address_Value;
1367
1368    procedure Rcheck_PE_Missing_Return
1369      (File : System.Address; Line : Integer)
1370    is
1371    begin
1372       Raise_Program_Error_Msg (File, Line, Rmsg_25'Address);
1373    end Rcheck_PE_Missing_Return;
1374
1375    procedure Rcheck_PE_Overlaid_Controlled_Object
1376      (File : System.Address; Line : Integer)
1377    is
1378    begin
1379       Raise_Program_Error_Msg (File, Line, Rmsg_26'Address);
1380    end Rcheck_PE_Overlaid_Controlled_Object;
1381
1382    procedure Rcheck_PE_Potentially_Blocking_Operation
1383      (File : System.Address; Line : Integer)
1384    is
1385    begin
1386       Raise_Program_Error_Msg (File, Line, Rmsg_27'Address);
1387    end Rcheck_PE_Potentially_Blocking_Operation;
1388
1389    procedure Rcheck_PE_Stubbed_Subprogram_Called
1390      (File : System.Address; Line : Integer)
1391    is
1392    begin
1393       Raise_Program_Error_Msg (File, Line, Rmsg_28'Address);
1394    end Rcheck_PE_Stubbed_Subprogram_Called;
1395
1396    procedure Rcheck_PE_Unchecked_Union_Restriction
1397      (File : System.Address; Line : Integer)
1398    is
1399    begin
1400       Raise_Program_Error_Msg (File, Line, Rmsg_29'Address);
1401    end Rcheck_PE_Unchecked_Union_Restriction;
1402
1403    procedure Rcheck_PE_Non_Transportable_Actual
1404      (File : System.Address; Line : Integer)
1405    is
1406    begin
1407       Raise_Program_Error_Msg (File, Line, Rmsg_30'Address);
1408    end Rcheck_PE_Non_Transportable_Actual;
1409
1410    procedure Rcheck_SE_Empty_Storage_Pool
1411      (File : System.Address; Line : Integer)
1412    is
1413    begin
1414       Raise_Storage_Error_Msg (File, Line, Rmsg_31'Address);
1415    end Rcheck_SE_Empty_Storage_Pool;
1416
1417    procedure Rcheck_SE_Explicit_Raise
1418      (File : System.Address; Line : Integer)
1419    is
1420    begin
1421       Raise_Storage_Error_Msg (File, Line, Rmsg_32'Address);
1422    end Rcheck_SE_Explicit_Raise;
1423
1424    procedure Rcheck_SE_Infinite_Recursion
1425      (File : System.Address; Line : Integer)
1426    is
1427    begin
1428       Raise_Storage_Error_Msg (File, Line, Rmsg_33'Address);
1429    end Rcheck_SE_Infinite_Recursion;
1430
1431    procedure Rcheck_SE_Object_Too_Large
1432      (File : System.Address; Line : Integer)
1433    is
1434    begin
1435       Raise_Storage_Error_Msg (File, Line, Rmsg_34'Address);
1436    end Rcheck_SE_Object_Too_Large;
1437
1438    procedure Rcheck_CE_Access_Check_Ext
1439      (File : System.Address; Line, Column : Integer)
1440    is
1441    begin
1442       Raise_Constraint_Error_Msg (File, Line, Column, Rmsg_00'Address);
1443    end Rcheck_CE_Access_Check_Ext;
1444
1445    procedure Rcheck_CE_Index_Check_Ext
1446      (File : System.Address; Line, Column, Index, First, Last : Integer)
1447    is
1448       Msg : constant String :=
1449         Rmsg_05 (Rmsg_05'First .. Rmsg_05'Last - 1) & ASCII.LF &
1450         "index " & Image (Index) & " not in " & Image (First) &
1451         ".." & Image (Last) & ASCII.NUL;
1452    begin
1453       Raise_Constraint_Error_Msg (File, Line, Column, Msg'Address);
1454    end Rcheck_CE_Index_Check_Ext;
1455
1456    procedure Rcheck_CE_Invalid_Data_Ext
1457      (File : System.Address; Line, Column, Index, First, Last : Integer)
1458    is
1459       Msg : constant String :=
1460         Rmsg_06 (Rmsg_06'First .. Rmsg_06'Last - 1) & ASCII.LF &
1461         "value " & Image (Index) & " not in " & Image (First) &
1462         ".." & Image (Last) & ASCII.NUL;
1463    begin
1464       Raise_Constraint_Error_Msg (File, Line, Column, Msg'Address);
1465    end Rcheck_CE_Invalid_Data_Ext;
1466
1467    procedure Rcheck_CE_Range_Check_Ext
1468      (File : System.Address; Line, Column, Index, First, Last : Integer)
1469    is
1470       Msg : constant String :=
1471         Rmsg_12 (Rmsg_12'First .. Rmsg_12'Last - 1) & ASCII.LF &
1472         "value " & Image (Index) & " not in " & Image (First) &
1473         ".." & Image (Last) & ASCII.NUL;
1474    begin
1475       Raise_Constraint_Error_Msg (File, Line, Column, Msg'Address);
1476    end Rcheck_CE_Range_Check_Ext;
1477
1478    procedure Rcheck_PE_Finalize_Raised_Exception
1479      (File : System.Address; Line : Integer)
1480    is
1481       X : constant EOA := Exception_Propagation.Allocate_Occurrence;
1482
1483    begin
1484       --  This is "finalize/adjust raised exception". This subprogram is always
1485       --  called with abort deferred, unlike all other Rcheck_* routines, it
1486       --  needs to call Raise_Exception_No_Defer.
1487
1488       --  This is consistent with Raise_From_Controlled_Operation
1489
1490       Exception_Data.Set_Exception_C_Msg
1491         (X, Program_Error_Def'Access, File, Line, 0, Rmsg_22'Address);
1492       Complete_And_Propagate_Occurrence (X);
1493    end Rcheck_PE_Finalize_Raised_Exception;
1494
1495    -------------
1496    -- Reraise --
1497    -------------
1498
1499    procedure Reraise is
1500       Excep    : constant EOA := Exception_Propagation.Allocate_Occurrence;
1501       Saved_MO : constant System.Address := Excep.Machine_Occurrence;
1502    begin
1503       if not ZCX_By_Default then
1504          Abort_Defer.all;
1505       end if;
1506       Save_Occurrence (Excep.all, Get_Current_Excep.all.all);
1507       Excep.Machine_Occurrence := Saved_MO;
1508       Complete_And_Propagate_Occurrence (Excep);
1509    end Reraise;
1510
1511    --------------------------------------
1512    -- Reraise_Library_Exception_If_Any --
1513    --------------------------------------
1514
1515    procedure Reraise_Library_Exception_If_Any is
1516       LE : Exception_Occurrence;
1517    begin
1518       if Library_Exception_Set then
1519          LE := Library_Exception;
1520          if LE.Id = Null_Id then
1521             Raise_Exception_No_Defer
1522               (E       => Program_Error'Identity,
1523                Message => "finalize/adjust raised exception");
1524          else
1525             Raise_From_Controlled_Operation (LE);
1526          end if;
1527       end if;
1528    end Reraise_Library_Exception_If_Any;
1529
1530    ------------------------
1531    -- Reraise_Occurrence --
1532    ------------------------
1533
1534    procedure Reraise_Occurrence (X : Exception_Occurrence) is
1535    begin
1536       if X.Id = null then
1537          return;
1538       end if;
1539
1540       Reraise_Occurrence_Always (X);
1541    end Reraise_Occurrence;
1542
1543    -------------------------------
1544    -- Reraise_Occurrence_Always --
1545    -------------------------------
1546
1547    procedure Reraise_Occurrence_Always (X : Exception_Occurrence) is
1548    begin
1549       if not ZCX_By_Default then
1550          Abort_Defer.all;
1551       end if;
1552
1553       Reraise_Occurrence_No_Defer (X);
1554    end Reraise_Occurrence_Always;
1555
1556    ---------------------------------
1557    -- Reraise_Occurrence_No_Defer --
1558    ---------------------------------
1559
1560    procedure Reraise_Occurrence_No_Defer (X : Exception_Occurrence) is
1561       Excep    : constant EOA := Exception_Propagation.Allocate_Occurrence;
1562       Saved_MO : constant System.Address := Excep.Machine_Occurrence;
1563    begin
1564       Save_Occurrence (Excep.all, X);
1565       Excep.Machine_Occurrence := Saved_MO;
1566       Complete_And_Propagate_Occurrence (Excep);
1567    end Reraise_Occurrence_No_Defer;
1568
1569    ---------------------
1570    -- Save_Occurrence --
1571    ---------------------
1572
1573    procedure Save_Occurrence
1574      (Target : out Exception_Occurrence;
1575       Source : Exception_Occurrence)
1576    is
1577    begin
1578       --  As the machine occurrence might be a data that must be finalized
1579       --  (outside any Ada mechanism), do not copy it
1580
1581       Target.Id                 := Source.Id;
1582       Target.Machine_Occurrence := System.Null_Address;
1583       Target.Msg_Length         := Source.Msg_Length;
1584       Target.Num_Tracebacks     := Source.Num_Tracebacks;
1585       Target.Pid                := Source.Pid;
1586
1587       Target.Msg (1 .. Target.Msg_Length) :=
1588         Source.Msg (1 .. Target.Msg_Length);
1589
1590       Target.Tracebacks (1 .. Target.Num_Tracebacks) :=
1591         Source.Tracebacks (1 .. Target.Num_Tracebacks);
1592    end Save_Occurrence;
1593
1594    function Save_Occurrence (Source : Exception_Occurrence) return EOA is
1595       Target : constant EOA := new Exception_Occurrence;
1596    begin
1597       Save_Occurrence (Target.all, Source);
1598       return Target;
1599    end Save_Occurrence;
1600
1601    -------------------
1602    -- String_To_EId --
1603    -------------------
1604
1605    function String_To_EId (S : String) return Exception_Id
1606      renames Stream_Attributes.String_To_EId;
1607
1608    ------------------
1609    -- String_To_EO --
1610    ------------------
1611
1612    function String_To_EO (S : String) return Exception_Occurrence
1613      renames Stream_Attributes.String_To_EO;
1614
1615    ---------------
1616    -- To_Stderr --
1617    ---------------
1618
1619    procedure To_Stderr (C : Character) is
1620       type int is new Integer;
1621
1622       procedure put_char_stderr (C : int);
1623       pragma Import (C, put_char_stderr, "put_char_stderr");
1624
1625    begin
1626       put_char_stderr (Character'Pos (C));
1627    end To_Stderr;
1628
1629    procedure To_Stderr (S : String) is
1630    begin
1631       for J in S'Range loop
1632          if S (J) /= ASCII.CR then
1633             To_Stderr (S (J));
1634          end if;
1635       end loop;
1636    end To_Stderr;
1637
1638    -------------------------
1639    -- Transfer_Occurrence --
1640    -------------------------
1641
1642    procedure Transfer_Occurrence
1643      (Target : Exception_Occurrence_Access;
1644       Source : Exception_Occurrence)
1645    is
1646    begin
1647       Save_Occurrence (Target.all, Source);
1648    end Transfer_Occurrence;
1649
1650    ------------------------
1651    -- Triggered_By_Abort --
1652    ------------------------
1653
1654    function Triggered_By_Abort return Boolean is
1655       Ex : constant Exception_Occurrence_Access := Get_Current_Excep.all;
1656
1657    begin
1658       return Ex /= null
1659         and then Exception_Identity (Ex.all) = Standard'Abort_Signal'Identity;
1660    end Triggered_By_Abort;
1661
1662    -------------------------
1663    -- Wide_Exception_Name --
1664    -------------------------
1665
1666    WC_Encoding : Character;
1667    pragma Import (C, WC_Encoding, "__gl_wc_encoding");
1668    --  Encoding method for source, as exported by binder
1669
1670    function Wide_Exception_Name
1671      (Id : Exception_Id) return Wide_String
1672    is
1673       S : constant String := Exception_Name (Id);
1674       W : Wide_String (1 .. S'Length);
1675       L : Natural;
1676    begin
1677       String_To_Wide_String
1678         (S, W, L, Get_WC_Encoding_Method (WC_Encoding));
1679       return W (1 .. L);
1680    end Wide_Exception_Name;
1681
1682    function Wide_Exception_Name
1683      (X : Exception_Occurrence) return Wide_String
1684    is
1685       S : constant String := Exception_Name (X);
1686       W : Wide_String (1 .. S'Length);
1687       L : Natural;
1688    begin
1689       String_To_Wide_String
1690         (S, W, L, Get_WC_Encoding_Method (WC_Encoding));
1691       return W (1 .. L);
1692    end Wide_Exception_Name;
1693
1694    ----------------------------
1695    -- Wide_Wide_Exception_Name --
1696    -----------------------------
1697
1698    function Wide_Wide_Exception_Name
1699      (Id : Exception_Id) return Wide_Wide_String
1700    is
1701       S : constant String := Exception_Name (Id);
1702       W : Wide_Wide_String (1 .. S'Length);
1703       L : Natural;
1704    begin
1705       String_To_Wide_Wide_String
1706         (S, W, L, Get_WC_Encoding_Method (WC_Encoding));
1707       return W (1 .. L);
1708    end Wide_Wide_Exception_Name;
1709
1710    function Wide_Wide_Exception_Name
1711      (X : Exception_Occurrence) return Wide_Wide_String
1712    is
1713       S : constant String := Exception_Name (X);
1714       W : Wide_Wide_String (1 .. S'Length);
1715       L : Natural;
1716    begin
1717       String_To_Wide_Wide_String
1718         (S, W, L, Get_WC_Encoding_Method (WC_Encoding));
1719       return W (1 .. L);
1720    end Wide_Wide_Exception_Name;
1721
1722    --------------------------
1723    -- Code_Address_For_ZZZ --
1724    --------------------------
1725
1726    --  This function gives us the end of the PC range for addresses
1727    --  within the exception unit itself. We hope that gigi/gcc keeps all the
1728    --  procedures in their original order!
1729
1730    function Code_Address_For_ZZZ return System.Address is
1731    begin
1732       <<Start_Of_ZZZ>>
1733       return Start_Of_ZZZ'Address;
1734    end Code_Address_For_ZZZ;
1735
1736 end Ada.Exceptions;