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) 1992-2005 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          --  Remember source index of system.ads (which was read successfully)
 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       --  Set -gnatR3m mode if debug flag A set
 166
 167       if Debug_Flag_AA then
 168          Back_Annotate_Rep_Info := True;
 169          List_Representation_Info := 1;
 170          List_Representation_Info_Mechanisms := True;
 171       end if;
 172
 173       --  Output copyright notice if full list mode
 174
 175       if (Verbose_Mode or Full_List)
 176         and then (not Debug_Flag_7)
 177       then
 178          Write_Eol;
 179          Write_Str ("GNAT ");
 180          Write_Str (Gnat_Version_String);
 181          Write_Eol;
 182          Write_Str ("Copyright 1992-2005 Free Software Foundation, Inc.");
 183          Write_Eol;
 184       end if;
 185
 186       --  Before we do anything else, adjust certain global values for
 187       --  debug switches which modify their normal natural settings.
 188
 189       if Debug_Flag_8 then
 190          Ttypes.Bytes_Big_Endian := not Ttypes.Bytes_Big_Endian;
 191       end if;
 192
 193       if Debug_Flag_M then
 194          Targparm.OpenVMS_On_Target := True;
 195          Hostparm.OpenVMS := True;
 196       end if;
 197
 198       if Debug_Flag_FF then
 199          Targparm.Frontend_Layout_On_Target := True;
 200       end if;
 201
 202       --  We take the default exception mechanism into account
 203
 204       if Targparm.ZCX_By_Default_On_Target then
 205          if Targparm.GCC_ZCX_Support_On_Target then
 206             Exception_Mechanism := Back_End_ZCX_Exceptions;
 207          else
 208             Exception_Mechanism := Front_End_ZCX_Exceptions;
 209          end if;
 210       end if;
 211
 212       --  We take the command line exception mechanism into account
 213
 214       if Opt.Zero_Cost_Exceptions_Set then
 215          if Opt.Zero_Cost_Exceptions_Val = False then
 216             Exception_Mechanism := Front_End_Setjmp_Longjmp_Exceptions;
 217
 218          elsif Debug_Flag_XX then
 219             Exception_Mechanism := Front_End_ZCX_Exceptions;
 220
 221          elsif Targparm.GCC_ZCX_Support_On_Target then
 222             Exception_Mechanism := Back_End_ZCX_Exceptions;
 223
 224          elsif Targparm.Front_End_ZCX_Support_On_Target then
 225             Exception_Mechanism := Front_End_ZCX_Exceptions;
 226
 227          else
 228             Osint.Fail
 229               ("Zero Cost Exceptions not supported on this target");
 230          end if;
 231       end if;
 232
 233       --  Set proper status for overflow checks. We turn on overflow checks
 234       --  if -gnatp was not specified, and either -gnato is set or the back
 235       --  end takes care of overflow checks. Otherwise we suppress overflow
 236       --  checks by default (since front end checks are expensive).
 237
 238       if not Opt.Suppress_Checks
 239         and then (Opt.Enable_Overflow_Checks
 240                     or else
 241                       (Targparm.Backend_Divide_Checks_On_Target
 242                         and
 243                        Targparm.Backend_Overflow_Checks_On_Target))
 244       then
 245          Suppress_Options (Overflow_Check) := False;
 246       else
 247          Suppress_Options (Overflow_Check) := True;
 248       end if;
 249
 250       --  Check we have exactly one source file, this happens only in the case
 251       --  where the driver is called directly, it cannot happen when gnat1 is
 252       --  invoked from gcc in the normal case.
 253
 254       if Osint.Number_Of_Files /= 1 then
 255          Usage;
 256          Write_Eol;
 257          Osint.Fail ("you must provide one source file");
 258
 259       elsif Usage_Requested then
 260          Usage;
 261       end if;
 262
 263       Original_Operating_Mode := Operating_Mode;
 264       Frontend;
 265       Main_Unit_Node := Cunit (Main_Unit);
 266       Main_Kind := Nkind (Unit (Main_Unit_Node));
 267
 268       --  Check for suspicious or incorrect body present if we are doing
 269       --  semantic checking. We omit this check in syntax only mode, because
 270       --  in that case we do not know if we need a body or not.
 271
 272       if Operating_Mode /= Check_Syntax
 273         and then
 274           ((Main_Kind = N_Package_Declaration
 275              and then not Body_Required (Main_Unit_Node))
 276            or else (Main_Kind = N_Generic_Package_Declaration
 277                      and then not Body_Required (Main_Unit_Node))
 278            or else Main_Kind = N_Package_Renaming_Declaration
 279            or else Main_Kind = N_Subprogram_Renaming_Declaration
 280            or else Nkind (Original_Node (Unit (Main_Unit_Node)))
 281                            in N_Generic_Instantiation)
 282       then
 283          Bad_Body : declare
 284             Sname   : Unit_Name_Type := Unit_Name (Main_Unit);
 285             Src_Ind : Source_File_Index;
 286             Fname   : File_Name_Type;
 287
 288             procedure Bad_Body_Error (Msg : String);
 289             --  Issue message for bad body found
 290
 291             --------------------
 292             -- Bad_Body_Error --
 293             --------------------
 294
 295             procedure Bad_Body_Error (Msg : String) is
 296             begin
 297                Error_Msg_N (Msg, Main_Unit_Node);
 298                Error_Msg_Name_1 := Fname;
 299                Error_Msg_N
 300                  ("remove incorrect body in file{!", Main_Unit_Node);
 301             end Bad_Body_Error;
 302
 303          --  Start of processing for Bad_Body
 304
 305          begin
 306             Sname := Unit_Name (Main_Unit);
 307
 308             --  If we do not already have a body name, then get the body name
 309             --  (but how can we have a body name here ???)
 310
 311             if not Is_Body_Name (Sname) then
 312                Sname := Get_Body_Name (Sname);
 313             end if;
 314
 315             Fname := Get_File_Name (Sname, Subunit => False);
 316             Src_Ind := Load_Source_File (Fname);
 317
 318             --  Case where body is present and it is not a subunit. Exclude
 319             --  the subunit case, because it has nothing to do with the
 320             --  package we are compiling. It is illegal for a child unit and a
 321             --  subunit with the same expanded name (RM 10.2(9)) to appear
 322             --  together in a partition, but there is nothing to stop a
 323             --  compilation environment from having both, and the test here
 324             --  simply allows that. If there is an attempt to include both in
 325             --  a partition, this is diagnosed at bind time. In Ada 83 mode
 326             --  this is not a warning case.
 327
 328             --  Note: if weird file names are being used, we can have
 329             --  situation where the file name that supposedly contains body,
 330             --  in fact contains a spec, or we can't tell what it contains.
 331             --  Skip the error message in these cases.
 332
 333             if Src_Ind /= No_Source_File
 334               and then Get_Expected_Unit_Type (Fname) = Expect_Body
 335               and then not Source_File_Is_Subunit (Src_Ind)
 336             then
 337                Error_Msg_Name_1 := Sname;
 338
 339                --  Ada 83 case of a package body being ignored. This is not an
 340                --  error as far as the Ada 83 RM is concerned, but it is
 341                --  almost certainly not what is wanted so output a warning.
 342                --  Give this message only if there were no errors, since
 343                --  otherwise it may be incorrect (we may have misinterpreted a
 344                --  junk spec as not needing a body when it really does).
 345
 346                if Main_Kind = N_Package_Declaration
 347                  and then Ada_Version = Ada_83
 348                  and then Operating_Mode = Generate_Code
 349                  and then Distribution_Stub_Mode /= Generate_Caller_Stub_Body
 350                  and then not Compilation_Errors
 351                then
 352                   Error_Msg_N
 353                     ("package % does not require a body?!", Main_Unit_Node);
 354                   Error_Msg_Name_1 := Fname;
 355                   Error_Msg_N
 356                     ("body in file{?! will be ignored", Main_Unit_Node);
 357
 358                --  Ada 95 cases of a body file present when no body is
 359                --  permitted. This we consider to be an error.
 360
 361                else
 362                   --  For generic instantiations, we never allow a body
 363
 364                   if Nkind (Original_Node (Unit (Main_Unit_Node)))
 365                       in N_Generic_Instantiation
 366                   then
 367                      Bad_Body_Error
 368                        ("generic instantiation for % does not allow a body");
 369
 370                   --  A library unit that is a renaming never allows a body
 371
 372                   elsif Main_Kind in N_Renaming_Declaration then
 373                      Bad_Body_Error
 374                        ("renaming declaration for % does not allow a body!");
 375
 376                   --  Remaining cases are packages and generic packages. Here
 377                   --  we only do the test if there are no previous errors,
 378                   --  because if there are errors, they may lead us to
 379                   --  incorrectly believe that a package does not allow a body
 380                   --  when in fact it does.
 381
 382                   elsif not Compilation_Errors then
 383                      if Main_Kind = N_Package_Declaration then
 384                         Bad_Body_Error
 385                           ("package % does not allow a body!");
 386
 387                      elsif Main_Kind = N_Generic_Package_Declaration then
 388                         Bad_Body_Error
 389                           ("generic package % does not allow a body!");
 390                      end if;
 391                   end if;
 392
 393                end if;
 394             end if;
 395          end Bad_Body;
 396       end if;
 397
 398       --  Exit if compilation errors detected
 399
 400       if Compilation_Errors then
 401          Treepr.Tree_Dump;
 402          Sem_Ch13.Validate_Unchecked_Conversions;
 403          Errout.Finalize;
 404          Namet.Finalize;
 405
 406          --  Generate ALI file if specially requested
 407
 408          if Opt.Force_ALI_Tree_File then
 409             Write_ALI (Object => False);
 410             Tree_Gen;
 411          end if;
 412
 413          Exit_Program (E_Errors);
 414       end if;
 415
 416       --  Set Generate_Code on main unit and its spec. We do this even if are
 417       --  not generating code, since Lib-Writ uses this to determine which
 418       --  units get written in the ali file.
 419
 420       Set_Generate_Code (Main_Unit);
 421
 422       --  If we have a corresponding spec, then we need object
 423       --  code for the spec unit as well
 424
 425       if Nkind (Unit (Main_Unit_Node)) in N_Unit_Body
 426         and then not Acts_As_Spec (Main_Unit_Node)
 427       then
 428          Set_Generate_Code
 429            (Get_Cunit_Unit_Number (Library_Unit (Main_Unit_Node)));
 430       end if;
 431
 432       --  Case of no code required to be generated, exit indicating no error
 433
 434       if Original_Operating_Mode = Check_Syntax then
 435          Treepr.Tree_Dump;
 436          Errout.Finalize;
 437          Tree_Gen;
 438          Namet.Finalize;
 439          Exit_Program (E_Success);
 440
 441       elsif Original_Operating_Mode = Check_Semantics then
 442          Back_End_Mode := Declarations_Only;
 443
 444       --  All remaining cases are cases in which the user requested that code
 445       --  be generated (i.e. no -gnatc or -gnats switch was used). Check if
 446       --  we can in fact satisfy this request.
 447
 448       --  Cannot generate code if someone has turned off code generation for
 449       --  any reason at all. We will try to figure out a reason below.
 450
 451       elsif Operating_Mode /= Generate_Code then
 452          Back_End_Mode := Skip;
 453
 454       --  We can generate code for a subprogram body unless there were missing
 455       --  subunits. Note that we always generate code for all generic units (a
 456       --  change from some previous versions of GNAT).
 457
 458       elsif Main_Kind = N_Subprogram_Body
 459         and then not Subunits_Missing
 460       then
 461          Back_End_Mode := Generate_Object;
 462
 463       --  We can generate code for a package body unless there are subunits
 464       --  missing (note that we always generate code for generic units, which
 465       --  is a change from some earlier versions of GNAT).
 466
 467       elsif Main_Kind = N_Package_Body
 468         and then not Subunits_Missing
 469       then
 470          Back_End_Mode := Generate_Object;
 471
 472       --  We can generate code for a package declaration or a subprogram
 473       --  declaration only if it does not required a body.
 474
 475       elsif (Main_Kind = N_Package_Declaration
 476                or else
 477              Main_Kind = N_Subprogram_Declaration)
 478         and then
 479           (not Body_Required (Main_Unit_Node)
 480              or else
 481            Distribution_Stub_Mode = Generate_Caller_Stub_Body)
 482       then
 483          Back_End_Mode := Generate_Object;
 484
 485       --  We can generate code for a generic package declaration of a generic
 486       --  subprogram declaration only if does not require a body.
 487
 488       elsif (Main_Kind = N_Generic_Package_Declaration
 489                or else
 490              Main_Kind = N_Generic_Subprogram_Declaration)
 491         and then not Body_Required (Main_Unit_Node)
 492       then
 493          Back_End_Mode := Generate_Object;
 494
 495       --  Compilation units that are renamings do not require bodies,
 496       --  so we can generate code for them.
 497
 498       elsif Main_Kind = N_Package_Renaming_Declaration
 499         or else Main_Kind = N_Subprogram_Renaming_Declaration
 500       then
 501          Back_End_Mode := Generate_Object;
 502
 503       --  Compilation units that are generic renamings do not require bodies
 504       --  so we can generate code for them.
 505
 506       elsif Main_Kind in N_Generic_Renaming_Declaration then
 507          Back_End_Mode := Generate_Object;
 508
 509       --  In all other cases (specs which have bodies, generics, and bodies
 510       --  where subunits are missing), we cannot generate code and we generate
 511       --  a warning message. Note that generic instantiations are gone at this
 512       --  stage since they have been replaced by their instances.
 513
 514       else
 515          Back_End_Mode := Skip;
 516       end if;
 517
 518       --  At this stage Call_Back_End is set to indicate if the backend should
 519       --  be called to generate code. If it is not set, then code generation
 520       --  has been turned off, even though code was requested by the original
 521       --  command. This is not an error from the user point of view, but it is
 522       --  an error from the point of view of the gcc driver, so we must exit
 523       --  with an error status.
 524
 525       --  We generate an informative message (from the gcc point of view, it
 526       --  is an error message, but from the users point of view this is not an
 527       --  error, just a consequence of compiling something that cannot
 528       --  generate code).
 529
 530       if Back_End_Mode = Skip then
 531          Write_Str ("cannot generate code for ");
 532          Write_Str ("file ");
 533          Write_Name (Unit_File_Name (Main_Unit));
 534
 535          if Subunits_Missing then
 536             Write_Str (" (missing subunits)");
 537             Write_Eol;
 538             Write_Str ("to check parent unit");
 539
 540          elsif Main_Kind = N_Subunit then
 541             Write_Str (" (subunit)");
 542             Write_Eol;
 543             Write_Str ("to check subunit");
 544
 545          elsif Main_Kind = N_Subprogram_Declaration then
 546             Write_Str (" (subprogram spec)");
 547             Write_Eol;
 548             Write_Str ("to check subprogram spec");
 549
 550          --  Generic package body in GNAT implementation mode
 551
 552          elsif Main_Kind = N_Package_Body and then GNAT_Mode then
 553             Write_Str (" (predefined generic)");
 554             Write_Eol;
 555             Write_Str ("to check predefined generic");
 556
 557          --  Only other case is a package spec
 558
 559          else
 560             Write_Str (" (package spec)");
 561             Write_Eol;
 562             Write_Str ("to check package spec");
 563          end if;
 564
 565          Write_Str (" for errors, use ");
 566
 567          if Hostparm.OpenVMS then
 568             Write_Str ("/NOLOAD");
 569          else
 570             Write_Str ("-gnatc");
 571          end if;
 572
 573          Write_Eol;
 574
 575          Sem_Ch13.Validate_Unchecked_Conversions;
 576          Errout.Finalize;
 577          Treepr.Tree_Dump;
 578          Tree_Gen;
 579          Write_ALI (Object => False);
 580          Namet.Finalize;
 581
 582          --  Exit program with error indication, to kill object file
 583
 584          Exit_Program (E_No_Code);
 585       end if;
 586
 587       --  In -gnatc mode, we only do annotation if -gnatt or -gnatR is also
 588       --  set as indicated by Back_Annotate_Rep_Info being set to True.
 589
 590       --  We don't call for annotations on a subunit, because to process those
 591       --  the back-end requires that the parent(s) be properly compiled.
 592
 593       --  Annotation is suppressed for targets where front-end layout is
 594       --  enabled, because the front end determines representations.
 595
 596       --  Annotation is also suppressed in the case of compiling for
 597       --  the Java VM, since representations are largely symbolic there.
 598
 599       if Back_End_Mode = Declarations_Only
 600         and then (not Back_Annotate_Rep_Info
 601                     or else Main_Kind = N_Subunit
 602                     or else Targparm.Frontend_Layout_On_Target
 603                     or else Hostparm.Java_VM)
 604       then
 605          Sem_Ch13.Validate_Unchecked_Conversions;
 606          Errout.Finalize;
 607          Write_ALI (Object => False);
 608          Tree_Dump;
 609          Tree_Gen;
 610          Namet.Finalize;
 611          return;
 612       end if;
 613
 614       --  Ensure that we properly register a dependency on system.ads, since
 615       --  even if we do not semantically depend on this, Targparm has read
 616       --  system parameters from the system.ads file.
 617
 618       Lib.Writ.Ensure_System_Dependency;
 619
 620       --  Add dependencies, if any, on preprocessing data file and on
 621       --  preprocessing definition file(s).
 622
 623       Prepcomp.Add_Dependencies;
 624
 625       --  Back end needs to explicitly unlock tables it needs to touch
 626
 627       Atree.Lock;
 628       Elists.Lock;
 629       Fname.UF.Lock;
 630       Inline.Lock;
 631       Lib.Lock;
 632       Nlists.Lock;
 633       Sem.Lock;
 634       Sinput.Lock;
 635       Namet.Lock;
 636       Stringt.Lock;
 637
 638       --  Here we call the back end to generate the output code
 639
 640       Back_End.Call_Back_End (Back_End_Mode);
 641
 642       --  Once the backend is complete, we unlock the names table. This call
 643       --  allows a few extra entries, needed for example for the file name for
 644       --  the library file output.
 645
 646       Namet.Unlock;
 647
 648       --  Validate unchecked conversions (using the values for size and
 649       --  alignment annotated by the backend where possible).
 650
 651       Sem_Ch13.Validate_Unchecked_Conversions;
 652
 653       --  Now we complete output of errors, rep info and the tree info. These
 654       --  are delayed till now, since it is perfectly possible for gigi to
 655       --  generate errors, modify the tree (in particular by setting flags
 656       --  indicating that elaboration is required, and also to back annotate
 657       --  representation information for List_Rep_Info.
 658
 659       Errout.Finalize;
 660       List_Rep_Info;
 661
 662       --  Only write the library if the backend did not generate any error
 663       --  messages. Otherwise signal errors to the driver program so that
 664       --  there will be no attempt to generate an object file.
 665
 666       if Compilation_Errors then
 667          Treepr.Tree_Dump;
 668          Exit_Program (E_Errors);
 669       end if;
 670
 671       Write_ALI (Object => (Back_End_Mode = Generate_Object));
 672
 673       --  Generate the ASIS tree after writing the ALI file, since in ASIS
 674       --  mode, Write_ALI may in fact result in further tree decoration from
 675       --  the original tree file. Note that we dump the tree just before
 676       --  generating it, so that the dump will exactly reflect what is written
 677       --  out.
 678
 679       Treepr.Tree_Dump;
 680       Tree_Gen;
 681
 682       --  Finalize name table and we are all done
 683
 684       Namet.Finalize;
 685
 686    exception
 687       --  Handle fatal internal compiler errors
 688
 689       when System.Assertions.Assert_Failure =>
 690          Comperr.Compiler_Abort ("Assert_Failure");
 691
 692       when Constraint_Error =>
 693          Comperr.Compiler_Abort ("Constraint_Error");
 694
 695       when Program_Error =>
 696          Comperr.Compiler_Abort ("Program_Error");
 697
 698       when Storage_Error =>
 699
 700          --  Assume this is a bug. If it is real, the message will in any case
 701          --  say Storage_Error, giving a strong hint!
 702
 703          Comperr.Compiler_Abort ("Storage_Error");
 704    end;
 705
 706 --  The outer exception handles an unrecoverable error
 707
 708 exception
 709    when Unrecoverable_Error =>
 710       Errout.Finalize;
 711
 712       Set_Standard_Error;
 713       Write_Str ("compilation abandoned");
 714       Write_Eol;
 715
 716       Set_Standard_Output;
 717       Source_Dump;
 718       Tree_Dump;
 719       Exit_Program (E_Errors);
 720
 721 end Gnat1drv;