gcc/ada/gnat1drv.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                             G N A T 1 D R V                              --
   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 -- GNAT was originally developed  by the GNAT team at  New York University. --
  23 -- Extensive contributions were provided by Ada Core Technologies Inc.      --
  24 --                                                                          --
  25 ------------------------------------------------------------------------------
  26
  27 with Atree;    use Atree;
  28 with Back_End; use Back_End;
  29 with Comperr;
  30 with Csets;    use Csets;
  31 with Debug;    use Debug;
  32 with Elists;
  33 with Errout;   use Errout;
  34 with Fmap;
  35 with Fname;    use Fname;
  36 with Fname.UF; use Fname.UF;
  37 with Frontend;
  38 with Gnatvsn;  use Gnatvsn;
  39 with Hostparm;
  40 with Inline;
  41 with Lib;      use Lib;
  42 with Lib.Writ; use Lib.Writ;
  43 with Lib.Xref;
  44 with Namet;    use Namet;
  45 with Nlists;
  46 with Opt;      use Opt;
  47 with Osint;    use Osint;
  48 with Output;   use Output;
  49 with Prepcomp;
  50 with Repinfo;  use Repinfo;
  51 with Restrict;
  52 with Sem;
  53 with Sem_Ch8;
  54 with Sem_Ch12;
  55 with Sem_Ch13;
  56 with Sem_Elim;
  57 with Sem_Eval;
  58 with Sem_Type;
  59 with Sinfo;    use Sinfo;
  60 with Sinput.L; use Sinput.L;
  61 with Snames;
  62 with Sprint;   use Sprint;
  63 with Stringt;
  64 with Targparm;
  65 with Tree_Gen;
  66 with Treepr;   use Treepr;
  67 with Ttypes;
  68 with Types;    use Types;
  69 with Uintp;    use Uintp;
  70 with Uname;    use Uname;
  71 with Urealp;
  72 with Usage;
  73
  74 with System.Assertions;
  75
  76 procedure Gnat1drv is
  77    Main_Unit_Node : Node_Id;
  78    --  Compilation unit node for main unit
  79
  80    Main_Kind : Node_Kind;
  81    --  Kind of main compilation unit node.
  82
  83    Back_End_Mode : Back_End.Back_End_Mode_Type;
  84    --  Record back end mode
  85
  86 begin
  87    --  This inner block is set up to catch assertion errors and constraint
  88    --  errors. Since the code for handling these errors can cause another
  89    --  exception to be raised (namely Unrecoverable_Error), we need two
  90    --  nested blocks, so that the outer one handles unrecoverable error.
  91
  92    begin
  93       --  Lib.Initialize need to be called before Scan_Compiler_Arguments,
  94       --  because it initialize a table that is filled by
  95       --  Scan_Compiler_Arguments.
  96
  97       Osint.Initialize;
  98       Fmap.Reset_Tables;
  99       Lib.Initialize;
 100       Lib.Xref.Initialize;
 101       Scan_Compiler_Arguments;
 102       Osint.Add_Default_Search_Dirs;
 103
 104       Nlists.Initialize;
 105       Sinput.Initialize;
 106       Sem.Initialize;
 107       Csets.Initialize;
 108       Uintp.Initialize;
 109       Urealp.Initialize;
 110       Errout.Initialize;
 111       Namet.Initialize;
 112       Snames.Initialize;
 113       Stringt.Initialize;
 114       Inline.Initialize;
 115       Sem_Ch8.Initialize;
 116       Sem_Ch12.Initialize;
 117       Sem_Ch13.Initialize;
 118       Sem_Elim.Initialize;
 119       Sem_Eval.Initialize;
 120       Sem_Type.Init_Interp_Tables;
 121
 122       --  Acquire target parameters from system.ads (source of package System)
 123
 124       declare
 125          use Sinput;
 126
 127          S : Source_File_Index;
 128          N : Name_Id;
 129
 130       begin
 131          Name_Buffer (1 .. 10) := "system.ads";
 132          Name_Len := 10;
 133          N := Name_Find;
 134          S := Load_Source_File (N);
 135
 136          if S = No_Source_File then
 137             Write_Line
 138               ("fatal error, run-time library not installed correctly");
 139             Write_Line
 140               ("cannot locate file system.ads");
 141             raise Unrecoverable_Error;
 142
 143          --  Here if system.ads successfully read. Remember its source index.
 144
 145          else
 146             System_Source_File_Index := S;
 147          end if;
 148
 149          Targparm.Get_Target_Parameters
 150            (System_Text  => Source_Text (S),
 151             Source_First => Source_First (S),
 152             Source_Last  => Source_Last (S));
 153
 154          --  Acquire configuration pragma information from Targparm
 155
 156          Restrict.Restrictions := Targparm.Restrictions_On_Target;
 157       end;
 158
 159       --  Set Configurable_Run_Time mode if system.ads flag set
 160
 161       if Targparm.Configurable_Run_Time_On_Target or Debug_Flag_YY then
 162          Configurable_Run_Time_Mode := True;
 163       end if;
 164
 165       --  Output copyright notice if full list mode
 166
 167       if (Verbose_Mode or Full_List)
 168         and then (not Debug_Flag_7)
 169       then
 170          Write_Eol;
 171          Write_Str ("GNAT ");
 172          Write_Str (Gnat_Version_String);
 173          Write_Str (" Copyright 1992-2004 Free Software Foundation, Inc.");
 174          Write_Eol;
 175       end if;
 176
 177       --  Before we do anything else, adjust certain global values for
 178       --  debug switches which modify their normal natural settings.
 179
 180       if Debug_Flag_8 then
 181          Ttypes.Bytes_Big_Endian := not Ttypes.Bytes_Big_Endian;
 182       end if;
 183
 184       if Debug_Flag_M then
 185          Targparm.OpenVMS_On_Target := True;
 186          Hostparm.OpenVMS := True;
 187       end if;
 188
 189       if Debug_Flag_FF then
 190          Targparm.Frontend_Layout_On_Target := True;
 191       end if;
 192
 193       --  We take the default exception mechanism into account
 194
 195       if Targparm.ZCX_By_Default_On_Target then
 196          if Targparm.GCC_ZCX_Support_On_Target then
 197             Exception_Mechanism := Back_End_ZCX_Exceptions;
 198          else
 199             Exception_Mechanism := Front_End_ZCX_Exceptions;
 200          end if;
 201       end if;
 202
 203       --  We take the command line exception mechanism into account
 204
 205       if Opt.Zero_Cost_Exceptions_Set then
 206          if Opt.Zero_Cost_Exceptions_Val = False then
 207             Exception_Mechanism := Front_End_Setjmp_Longjmp_Exceptions;
 208
 209          elsif Debug_Flag_XX then
 210             Exception_Mechanism := Front_End_ZCX_Exceptions;
 211
 212          elsif Targparm.GCC_ZCX_Support_On_Target then
 213             Exception_Mechanism := Back_End_ZCX_Exceptions;
 214
 215          elsif Targparm.Front_End_ZCX_Support_On_Target then
 216             Exception_Mechanism := Front_End_ZCX_Exceptions;
 217
 218          else
 219             Osint.Fail
 220               ("Zero Cost Exceptions not supported on this target");
 221          end if;
 222       end if;
 223
 224       --  Set proper status for overflow checks. We turn on overflow checks
 225       --  if -gnatp was not specified, and either -gnato is set or the back
 226       --  end takes care of overflow checks. Otherwise we suppress overflow
 227       --  checks by default (since front end checks are expensive).
 228
 229       if not Opt.Suppress_Checks
 230         and then (Opt.Enable_Overflow_Checks
 231                     or else
 232                       (Targparm.Backend_Divide_Checks_On_Target
 233                         and
 234                        Targparm.Backend_Overflow_Checks_On_Target))
 235       then
 236          Suppress_Options (Overflow_Check) := False;
 237       else
 238          Suppress_Options (Overflow_Check) := True;
 239       end if;
 240
 241       --  Check we have exactly one source file, this happens only in
 242       --  the case where the driver is called directly, it cannot happen
 243       --  when gnat1 is invoked from gcc in the normal case.
 244
 245       if Osint.Number_Of_Files /= 1 then
 246          Usage;
 247          Write_Eol;
 248          Osint.Fail ("you must provide one source file");
 249
 250       elsif Usage_Requested then
 251          Usage;
 252       end if;
 253
 254       Original_Operating_Mode := Operating_Mode;
 255       Frontend;
 256       Main_Unit_Node := Cunit (Main_Unit);
 257       Main_Kind := Nkind (Unit (Main_Unit_Node));
 258
 259       --  Check for suspicious or incorrect body present if we are doing
 260       --  semantic checking. We omit this check in syntax only mode, because
 261       --  in that case we do not know if we need a body or not.
 262
 263       if Operating_Mode /= Check_Syntax
 264         and then
 265           ((Main_Kind = N_Package_Declaration
 266              and then not Body_Required (Main_Unit_Node))
 267            or else (Main_Kind = N_Generic_Package_Declaration
 268                      and then not Body_Required (Main_Unit_Node))
 269            or else Main_Kind = N_Package_Renaming_Declaration
 270            or else Main_Kind = N_Subprogram_Renaming_Declaration
 271            or else Nkind (Original_Node (Unit (Main_Unit_Node)))
 272                            in N_Generic_Instantiation)
 273       then
 274          declare
 275             Sname   : Unit_Name_Type := Unit_Name (Main_Unit);
 276             Src_Ind : Source_File_Index;
 277             Fname   : File_Name_Type;
 278
 279             procedure Bad_Body (Msg : String);
 280             --  Issue message for bad body found
 281
 282             procedure Bad_Body (Msg : String) is
 283             begin
 284                Error_Msg_N (Msg, Main_Unit_Node);
 285                Error_Msg_Name_1 := Fname;
 286                Error_Msg_N
 287                  ("remove incorrect body in file{!", Main_Unit_Node);
 288             end Bad_Body;
 289
 290          begin
 291             Sname := Unit_Name (Main_Unit);
 292
 293             --  If we do not already have a body name, then get the body
 294             --  name (but how can we have a body name here ???)
 295
 296             if not Is_Body_Name (Sname) then
 297                Sname := Get_Body_Name (Sname);
 298             end if;
 299
 300             Fname := Get_File_Name (Sname, Subunit => False);
 301             Src_Ind := Load_Source_File (Fname);
 302
 303             --  Case where body is present and it is not a subunit. Exclude
 304             --  the subunit case, because it has nothing to do with the
 305             --  package we are compiling. It is illegal for a child unit
 306             --  and a subunit with the same expanded name (RM 10.2(9)) to
 307             --  appear together in a partition, but there is nothing to
 308             --  stop a compilation environment from having both, and the
 309             --  test here simply allows that. If there is an attempt to
 310             --  include both in a partition, this is diagnosed at bind time.
 311             --  In Ada 83 mode this is not a warning case.
 312
 313             --  Note: if weird file names are being used, we can have a
 314             --  situation where the file name that supposedly contains a
 315             --  body, in fact contains a spec, or we can't tell what it
 316             --  contains. Skip the error message in these cases.
 317
 318             if Src_Ind /= No_Source_File
 319               and then Get_Expected_Unit_Type (Fname) = Expect_Body
 320               and then not Source_File_Is_Subunit (Src_Ind)
 321             then
 322                Error_Msg_Name_1 := Sname;
 323
 324                --  Ada 83 case of a package body being ignored. This is not
 325                --  an error as far as the Ada 83 RM is concerned, but it is
 326                --  almost certainly not what is wanted so output a warning.
 327                --  Give this message only if there were no errors, since
 328                --  otherwise it may be incorrect (we may have misinterpreted
 329                --  a junk spec as not needing a body when it really does).
 330
 331                if Main_Kind = N_Package_Declaration
 332                  and then Ada_Version = Ada_83
 333                  and then Operating_Mode = Generate_Code
 334                  and then Distribution_Stub_Mode /= Generate_Caller_Stub_Body
 335                  and then not Compilation_Errors
 336                then
 337                   Error_Msg_N
 338                     ("package % does not require a body?!", Main_Unit_Node);
 339                   Error_Msg_Name_1 := Fname;
 340                   Error_Msg_N
 341                     ("body in file{?! will be ignored", Main_Unit_Node);
 342
 343                --  Ada 95 cases of a body file present when no body is
 344                --  permitted. This we consider to be an error.
 345
 346                else
 347                   --  For generic instantiations, we never allow a body
 348
 349                   if Nkind (Original_Node (Unit (Main_Unit_Node)))
 350                       in N_Generic_Instantiation
 351                   then
 352                      Bad_Body
 353                        ("generic instantiation for % does not allow a body");
 354
 355                   --  A library unit that is a renaming never allows a body
 356
 357                   elsif Main_Kind in N_Renaming_Declaration then
 358                      Bad_Body
 359                        ("renaming declaration for % does not allow a body!");
 360
 361                   --  Remaining cases are packages and generic packages.
 362                   --  Here we only do the test if there are no previous
 363                   --  errors, because if there are errors, they may lead
 364                   --  us to incorrectly believe that a package does not
 365                   --  allow a body when in fact it does.
 366
 367                   elsif not Compilation_Errors then
 368                      if Main_Kind = N_Package_Declaration then
 369                         Bad_Body ("package % does not allow a body!");
 370
 371                      elsif Main_Kind = N_Generic_Package_Declaration then
 372                         Bad_Body ("generic package % does not allow a body!");
 373                      end if;
 374                   end if;
 375
 376                end if;
 377             end if;
 378          end;
 379       end if;
 380
 381       --  Exit if compilation errors detected
 382
 383       if Compilation_Errors then
 384          Treepr.Tree_Dump;
 385          Sem_Ch13.Validate_Unchecked_Conversions;
 386          Errout.Finalize;
 387          Namet.Finalize;
 388
 389          --  Generate ALI file if specially requested
 390
 391          if Opt.Force_ALI_Tree_File then
 392             Write_ALI (Object => False);
 393             Tree_Gen;
 394          end if;
 395
 396          Exit_Program (E_Errors);
 397       end if;
 398
 399       --  Set Generate_Code on main unit and its spec. We do this even if
 400       --  are not generating code, since Lib-Writ uses this to determine
 401       --  which units get written in the ali file.
 402
 403       Set_Generate_Code (Main_Unit);
 404
 405       --  If we have a corresponding spec, then we need object
 406       --  code for the spec unit as well
 407
 408       if Nkind (Unit (Main_Unit_Node)) in N_Unit_Body
 409         and then not Acts_As_Spec (Main_Unit_Node)
 410       then
 411          Set_Generate_Code
 412            (Get_Cunit_Unit_Number (Library_Unit (Main_Unit_Node)));
 413       end if;
 414
 415       --  Case of no code required to be generated, exit indicating no error
 416
 417       if Original_Operating_Mode = Check_Syntax then
 418          Treepr.Tree_Dump;
 419          Errout.Finalize;
 420          Tree_Gen;
 421          Namet.Finalize;
 422          Exit_Program (E_Success);
 423
 424       elsif Original_Operating_Mode = Check_Semantics then
 425          Back_End_Mode := Declarations_Only;
 426
 427       --  All remaining cases are cases in which the user requested that code
 428       --  be generated (i.e. no -gnatc or -gnats switch was used). Check if
 429       --  we can in fact satisfy this request.
 430
 431       --  Cannot generate code if someone has turned off code generation
 432       --  for any reason at all. We will try to figure out a reason below.
 433
 434       elsif Operating_Mode /= Generate_Code then
 435          Back_End_Mode := Skip;
 436
 437       --  We can generate code for a subprogram body unless there were
 438       --  missing subunits. Note that we always generate code for all
 439       --  generic units (a change from some previous versions of GNAT).
 440
 441       elsif Main_Kind = N_Subprogram_Body
 442         and then not Subunits_Missing
 443       then
 444          Back_End_Mode := Generate_Object;
 445
 446       --  We can generate code for a package body unless there are subunits
 447       --  missing (note that we always generate code for generic units, which
 448       --  is a change from some earlier versions of GNAT).
 449
 450       elsif Main_Kind = N_Package_Body
 451         and then not Subunits_Missing
 452       then
 453          Back_End_Mode := Generate_Object;
 454
 455       --  We can generate code for a package declaration or a subprogram
 456       --  declaration only if it does not required a body.
 457
 458       elsif (Main_Kind = N_Package_Declaration
 459                or else
 460              Main_Kind = N_Subprogram_Declaration)
 461         and then
 462           (not Body_Required (Main_Unit_Node)
 463              or else
 464            Distribution_Stub_Mode = Generate_Caller_Stub_Body)
 465       then
 466          Back_End_Mode := Generate_Object;
 467
 468       --  We can generate code for a generic package declaration of a generic
 469       --  subprogram declaration only if does not require a body.
 470
 471       elsif (Main_Kind = N_Generic_Package_Declaration
 472                or else
 473              Main_Kind = N_Generic_Subprogram_Declaration)
 474         and then not Body_Required (Main_Unit_Node)
 475       then
 476          Back_End_Mode := Generate_Object;
 477
 478       --  Compilation units that are renamings do not require bodies,
 479       --  so we can generate code for them.
 480
 481       elsif Main_Kind = N_Package_Renaming_Declaration
 482         or else Main_Kind = N_Subprogram_Renaming_Declaration
 483       then
 484          Back_End_Mode := Generate_Object;
 485
 486       --  Compilation units that are generic renamings do not require bodies
 487       --  so we can generate code for them.
 488
 489       elsif Main_Kind in N_Generic_Renaming_Declaration then
 490          Back_End_Mode := Generate_Object;
 491
 492       --  In all other cases (specs which have bodies, generics, and bodies
 493       --  where subunits are missing), we cannot generate code and we generate
 494       --  a warning message. Note that generic instantiations are gone at this
 495       --  stage since they have been replaced by their instances.
 496
 497       else
 498          Back_End_Mode := Skip;
 499       end if;
 500
 501       --  At this stage Call_Back_End is set to indicate if the backend
 502       --  should be called to generate code. If it is not set, then code
 503       --  generation has been turned off, even though code was requested
 504       --  by the original command. This is not an error from the user
 505       --  point of view, but it is an error from the point of view of
 506       --  the gcc driver, so we must exit with an error status.
 507
 508       --  We generate an informative message (from the gcc point of view,
 509       --  it is an error message, but from the users point of view this
 510       --  is not an error, just a consequence of compiling something that
 511       --  cannot generate code).
 512
 513       if Back_End_Mode = Skip then
 514          Write_Str ("cannot generate code for ");
 515          Write_Str ("file ");
 516          Write_Name (Unit_File_Name (Main_Unit));
 517
 518          if Subunits_Missing then
 519             Write_Str (" (missing subunits)");
 520             Write_Eol;
 521             Write_Str ("to check parent unit");
 522
 523          elsif Main_Kind = N_Subunit then
 524             Write_Str (" (subunit)");
 525             Write_Eol;
 526             Write_Str ("to check subunit");
 527
 528          elsif Main_Kind = N_Subprogram_Declaration then
 529             Write_Str (" (subprogram spec)");
 530             Write_Eol;
 531             Write_Str ("to check subprogram spec");
 532
 533          --  Generic package body in GNAT implementation mode
 534
 535          elsif Main_Kind = N_Package_Body and then GNAT_Mode then
 536             Write_Str (" (predefined generic)");
 537             Write_Eol;
 538             Write_Str ("to check predefined generic");
 539
 540          --  Only other case is a package spec
 541
 542          else
 543             Write_Str (" (package spec)");
 544             Write_Eol;
 545             Write_Str ("to check package spec");
 546          end if;
 547
 548          Write_Str (" for errors, use ");
 549
 550          if Hostparm.OpenVMS then
 551             Write_Str ("/NOLOAD");
 552          else
 553             Write_Str ("-gnatc");
 554          end if;
 555
 556          Write_Eol;
 557
 558          Sem_Ch13.Validate_Unchecked_Conversions;
 559          Errout.Finalize;
 560          Treepr.Tree_Dump;
 561          Tree_Gen;
 562          Write_ALI (Object => False);
 563          Namet.Finalize;
 564
 565          --  Exit program with error indication, to kill object file
 566
 567          Exit_Program (E_No_Code);
 568       end if;
 569
 570       --  In -gnatc mode, we only do annotation if -gnatt or -gnatR is also
 571       --  set as indicated by Back_Annotate_Rep_Info being set to True.
 572
 573       --  We don't call for annotations on a subunit, because to process those
 574       --  the back-end requires that the parent(s) be properly compiled.
 575
 576       --  Annotation is also suppressed in the case of compiling for
 577       --  the Java VM, since representations are largely symbolic there.
 578
 579       if Back_End_Mode = Declarations_Only
 580         and then (not (Back_Annotate_Rep_Info or Debug_Flag_AA)
 581                    or else Main_Kind = N_Subunit
 582                    or else Hostparm.Java_VM)
 583       then
 584          Sem_Ch13.Validate_Unchecked_Conversions;
 585          Errout.Finalize;
 586          Write_ALI (Object => False);
 587          Tree_Dump;
 588          Tree_Gen;
 589          Namet.Finalize;
 590          return;
 591       end if;
 592
 593       --  Ensure that we properly register a dependency on system.ads,
 594       --  since even if we do not semantically depend on this, Targparm
 595       --  has read system parameters from the system.ads file.
 596
 597       Lib.Writ.Ensure_System_Dependency;
 598
 599       --  Add dependencies, if any, on preprocessing data file and on
 600       --  preprocessing definition file(s).
 601
 602       Prepcomp.Add_Dependencies;
 603
 604       --  Back end needs to explicitly unlock tables it needs to touch
 605
 606       Atree.Lock;
 607       Elists.Lock;
 608       Fname.UF.Lock;
 609       Inline.Lock;
 610       Lib.Lock;
 611       Nlists.Lock;
 612       Sem.Lock;
 613       Sinput.Lock;
 614       Namet.Lock;
 615       Stringt.Lock;
 616
 617       --  Here we call the back end to generate the output code
 618
 619       Back_End.Call_Back_End (Back_End_Mode);
 620
 621       --  Once the backend is complete, we unlock the names table. This
 622       --  call allows a few extra entries, needed for example for the file
 623       --  name for the library file output.
 624
 625       Namet.Unlock;
 626
 627       --  Validate unchecked conversions (using the values for size
 628       --  and alignment annotated by the backend where possible).
 629
 630       Sem_Ch13.Validate_Unchecked_Conversions;
 631
 632       --  Now we complete output of errors, rep info and the tree info.
 633       --  These are delayed till now, since it is perfectly possible for
 634       --  gigi to generate errors, modify the tree (in particular by setting
 635       --  flags indicating that elaboration is required, and also to back
 636       --  annotate representation information for List_Rep_Info.
 637
 638       Errout.Finalize;
 639       List_Rep_Info;
 640
 641       --  Only write the library if the backend did not generate any error
 642       --  messages. Otherwise signal errors to the driver program so that
 643       --  there will be no attempt to generate an object file.
 644
 645       if Compilation_Errors then
 646          Treepr.Tree_Dump;
 647          Exit_Program (E_Errors);
 648       end if;
 649
 650       Write_ALI (Object => (Back_End_Mode = Generate_Object));
 651
 652       --  Generate the ASIS tree after writing the ALI file, since in
 653       --  ASIS mode, Write_ALI may in fact result in further tree
 654       --  decoration from the original tree file. Note that we dump
 655       --  the tree just before generating it, so that the dump will
 656       --  exactly reflect what is written out.
 657
 658       Treepr.Tree_Dump;
 659       Tree_Gen;
 660
 661       --  Finalize name table and we are all done
 662
 663       Namet.Finalize;
 664
 665    exception
 666       --  Handle fatal internal compiler errors
 667
 668       when System.Assertions.Assert_Failure =>
 669          Comperr.Compiler_Abort ("Assert_Failure");
 670
 671       when Constraint_Error =>
 672          Comperr.Compiler_Abort ("Constraint_Error");
 673
 674       when Program_Error =>
 675          Comperr.Compiler_Abort ("Program_Error");
 676
 677       when Storage_Error =>
 678
 679          --  Assume this is a bug. If it is real, the message will in
 680          --  any case say Storage_Error, giving a strong hint!
 681
 682          Comperr.Compiler_Abort ("Storage_Error");
 683    end;
 684
 685 --  The outer exception handles an unrecoverable error
 686
 687 exception
 688    when Unrecoverable_Error =>
 689       Errout.Finalize;
 690
 691       Set_Standard_Error;
 692       Write_Str ("compilation abandoned");
 693       Write_Eol;
 694
 695       Set_Standard_Output;
 696       Source_Dump;
 697       Tree_Dump;
 698       Exit_Program (E_Errors);
 699
 700 end Gnat1drv;