gcc/ada/comperr.adb

   1 ------------------------------------------------------------------------------
   2 --                                                                          --
   3 --                         GNAT COMPILER COMPONENTS                         --
   4 --                                                                          --
   5 --                              C O M P E R R                               --
   6 --                                                                          --
   7 --                                 B o d y                                  --
   8 --                                                                          --
   9 --          Copyright (C) 1992-2008, 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.  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 COPYING3.  If not, go to --
  19 -- http://www.gnu.org/licenses for a complete copy of the license.          --
  20 --                                                                          --
  21 -- GNAT was originally developed  by the GNAT team at  New York University. --
  22 -- Extensive contributions were provided by AdaCore.                         --
  23 --                                                                          --
  24 ------------------------------------------------------------------------------
  25
  26 --  This package contains routines called when a fatal internal compiler
  27 --  error is detected. Calls to these routines cause termination of the
  28 --  current compilation with appropriate error output.
  29
  30 with Atree;    use Atree;
  31 with Debug;    use Debug;
  32 with Errout;   use Errout;
  33 with Fname;    use Fname;
  34 with Gnatvsn;  use Gnatvsn;
  35 with Lib;      use Lib;
  36 with Namet;    use Namet;
  37 with Osint;    use Osint;
  38 with Output;   use Output;
  39 with Sinput;   use Sinput;
  40 with Sprint;   use Sprint;
  41 with Sdefault; use Sdefault;
  42 with Targparm; use Targparm;
  43 with Treepr;   use Treepr;
  44 with Types;    use Types;
  45
  46 with Ada.Exceptions; use Ada.Exceptions;
  47
  48 with System.Soft_Links; use System.Soft_Links;
  49
  50 package body Comperr is
  51
  52    ----------------
  53    -- Local Data --
  54    ----------------
  55
  56    Abort_In_Progress : Boolean := False;
  57    --  Used to prevent runaway recursion if something segfaults
  58    --  while processing a previous abort.
  59
  60    -----------------------
  61    -- Local Subprograms --
  62    -----------------------
  63
  64    procedure Repeat_Char (Char : Character; Col : Nat; After : Character);
  65    --  Output Char until current column is at or past Col, and then output
  66    --  the character given by After (if column is already past Col on entry,
  67    --  then the effect is simply to output the After character).
  68
  69    --------------------
  70    -- Compiler_Abort --
  71    --------------------
  72
  73    procedure Compiler_Abort
  74      (X            : String;
  75       Code         : Integer := 0;
  76       Fallback_Loc : String := "")
  77    is
  78       --  The procedures below output a "bug box" with information about
  79       --  the cause of the compiler abort and about the preferred method
  80       --  of reporting bugs. The default is a bug box appropriate for
  81       --  the FSF version of GNAT, but there are specializations for
  82       --  the GNATPRO and Public releases by AdaCore.
  83
  84       XF : constant Positive := X'First;
  85       --  Start index, usually 1, but we won't assume this
  86
  87       procedure End_Line;
  88       --  Add blanks up to column 76, and then a final vertical bar
  89
  90       --------------
  91       -- End_Line --
  92       --------------
  93
  94       procedure End_Line is
  95       begin
  96          Repeat_Char (' ', 76, '|');
  97          Write_Eol;
  98       end End_Line;
  99
 100       Is_GPL_Version : constant Boolean := Gnatvsn.Build_Type = GPL;
 101       Is_FSF_Version : constant Boolean := Gnatvsn.Build_Type = FSF;
 102
 103    --  Start of processing for Compiler_Abort
 104
 105    begin
 106       Cancel_Special_Output;
 107
 108       --  Prevent recursion through Compiler_Abort, e.g. via SIGSEGV
 109
 110       if Abort_In_Progress then
 111          Exit_Program (E_Abort);
 112       end if;
 113
 114       Abort_In_Progress := True;
 115
 116       --  Generate a "standard" error message instead of a bug box in case of
 117       --  .NET compiler, since we do not support all constructs of the
 118       --  language. Of course ideally, we should detect this before bombing
 119       --  on e.g. an assertion error, but in practice most of these bombs
 120       --  are due to a legitimate case of a construct not being supported (in
 121       --  a sense they all are, since for sure we are not supporting something
 122       --  if we bomb!) By giving this message, we provide a more reasonable
 123       --  practical interface, since giving scary bug boxes on unsupported
 124       --  features is definitely not helpful.
 125
 126       --  Note that the call to Error_Msg_N below sets Serious_Errors_Detected
 127       --  to 1, so we use the regular mechanism below in order to display a
 128       --  "compilation abandoned" message and exit, so we still know we have
 129       --  this case (and -gnatdk can still be used to get the bug box).
 130
 131       if VM_Target = CLI_Target
 132         and then Serious_Errors_Detected = 0
 133         and then not Debug_Flag_K
 134         and then Sloc (Current_Error_Node) > No_Location
 135       then
 136          Error_Msg_N
 137            ("unsupported construct in this context",
 138             Current_Error_Node);
 139       end if;
 140
 141       --  If any errors have already occurred, then we guess that the abort
 142       --  may well be caused by previous errors, and we don't make too much
 143       --  fuss about it, since we want to let programmer fix the errors first.
 144
 145       --  Debug flag K disables this behavior (useful for debugging)
 146
 147       if Serious_Errors_Detected /= 0 and then not Debug_Flag_K then
 148          Errout.Finalize (Last_Call => True);
 149          Errout.Output_Messages;
 150
 151          Set_Standard_Error;
 152          Write_Str ("compilation abandoned due to previous error");
 153          Write_Eol;
 154
 155          Set_Standard_Output;
 156          Source_Dump;
 157          Tree_Dump;
 158          Exit_Program (E_Errors);
 159
 160       --  Otherwise give message with details of the abort
 161
 162       else
 163          Set_Standard_Error;
 164
 165          --  Generate header for bug box
 166
 167          Write_Char ('+');
 168          Repeat_Char ('=', 29, 'G');
 169          Write_Str ("NAT BUG DETECTED");
 170          Repeat_Char ('=', 76, '+');
 171          Write_Eol;
 172
 173          --  Output GNAT version identification
 174
 175          Write_Str ("| ");
 176          Write_Str (Gnat_Version_String);
 177          Write_Str (" (");
 178
 179          --  Output target name, deleting junk final reverse slash
 180
 181          if Target_Name.all (Target_Name.all'Last) = '\'
 182            or else Target_Name.all (Target_Name.all'Last) = '/'
 183          then
 184             Write_Str (Target_Name.all (1 .. Target_Name.all'Last - 1));
 185          else
 186             Write_Str (Target_Name.all);
 187          end if;
 188
 189          --  Output identification of error
 190
 191          Write_Str (") ");
 192
 193          if X'Length + Column > 76 then
 194             if Code < 0 then
 195                Write_Str ("GCC error:");
 196             end if;
 197
 198             End_Line;
 199
 200             Write_Str ("| ");
 201          end if;
 202
 203          if X'Length > 70 then
 204             declare
 205                Last_Blank : Integer := 70;
 206
 207             begin
 208                for P in 39 .. 68 loop
 209                   if X (XF + P) = ' ' then
 210                      Last_Blank := P;
 211                   end if;
 212                end loop;
 213
 214                Write_Str (X (XF .. XF - 1 + Last_Blank));
 215                End_Line;
 216                Write_Str ("|    ");
 217                Write_Str (X (XF + Last_Blank .. X'Last));
 218             end;
 219          else
 220             Write_Str (X);
 221          end if;
 222
 223          if Code > 0 then
 224             Write_Str (", Code=");
 225             Write_Int (Int (Code));
 226
 227          elsif Code = 0 then
 228
 229             --  For exception case, get exception message from the TSD. Note
 230             --  that it would be neater and cleaner to pass the exception
 231             --  message (obtained from Exception_Message) as a parameter to
 232             --  Compiler_Abort, but we can't do this quite yet since it would
 233             --  cause bootstrap path problems for 3.10 to 3.11.
 234
 235             Write_Char (' ');
 236             Write_Str (Exception_Message (Get_Current_Excep.all.all));
 237          end if;
 238
 239          End_Line;
 240
 241          --  Output source location information
 242
 243          if Sloc (Current_Error_Node) <= No_Location then
 244             if Fallback_Loc'Length > 0 then
 245                Write_Str ("| Error detected around ");
 246                Write_Str (Fallback_Loc);
 247             else
 248                Write_Str ("| No source file position information available");
 249             end if;
 250
 251             End_Line;
 252          else
 253             Write_Str ("| Error detected at ");
 254             Write_Location (Sloc (Current_Error_Node));
 255             End_Line;
 256          end if;
 257
 258          --  There are two cases now. If the file gnat_bug.box exists,
 259          --  we use the contents of this file at this point.
 260
 261          declare
 262             Lo  : Source_Ptr;
 263             Hi  : Source_Ptr;
 264             Src : Source_Buffer_Ptr;
 265
 266          begin
 267             Namet.Unlock;
 268             Name_Buffer (1 .. 12) := "gnat_bug.box";
 269             Name_Len := 12;
 270             Read_Source_File (Name_Enter, 0, Hi, Src);
 271
 272             --  If we get a Src file, we use it
 273
 274             if Src /= null then
 275                Lo := 0;
 276
 277                Outer : while Lo < Hi loop
 278                   Write_Str ("| ");
 279
 280                   Inner : loop
 281                      exit Inner when Src (Lo) = ASCII.CR
 282                        or else Src (Lo) = ASCII.LF;
 283                      Write_Char (Src (Lo));
 284                      Lo := Lo + 1;
 285                   end loop Inner;
 286
 287                   End_Line;
 288
 289                   while Lo <= Hi
 290                     and then (Src (Lo) = ASCII.CR
 291                                 or else Src (Lo) = ASCII.LF)
 292                   loop
 293                      Lo := Lo + 1;
 294                   end loop;
 295                end loop Outer;
 296
 297             --  Otherwise we use the standard fixed text
 298
 299             else
 300                if Is_FSF_Version then
 301                   Write_Str
 302                     ("| Please submit a bug report; see" &
 303                      " http://gcc.gnu.org/bugs.html.");
 304                   End_Line;
 305
 306                elsif Is_GPL_Version then
 307
 308                   Write_Str
 309                     ("| Please submit a bug report by email " &
 310                      "to report@adacore.com.");
 311                   End_Line;
 312
 313                   Write_Str
 314                     ("| GAP members can alternatively use GNAT Tracker:");
 315                   End_Line;
 316
 317                   Write_Str
 318                     ("| http://www.adacore.com/ " &
 319                      "section 'send a report'.");
 320                   End_Line;
 321
 322                   Write_Str
 323                     ("| See gnatinfo.txt for full info on procedure " &
 324                      "for submitting bugs.");
 325                   End_Line;
 326
 327                else
 328                   Write_Str
 329                     ("| Please submit a bug report using GNAT Tracker:");
 330                   End_Line;
 331
 332                   Write_Str
 333                     ("| http://www.adacore.com/gnattracker/ " &
 334                      "section 'send a report'.");
 335                   End_Line;
 336
 337                   Write_Str
 338                     ("| alternatively submit a bug report by email " &
 339                      "to report@adacore.com,");
 340                   End_Line;
 341
 342                   Write_Str
 343                     ("| including your customer number #nnn " &
 344                      "in the subject line.");
 345                   End_Line;
 346                end if;
 347
 348                Write_Str
 349                  ("| Use a subject line meaningful to you" &
 350                   " and us to track the bug.");
 351                End_Line;
 352
 353                Write_Str
 354                  ("| Include the entire contents of this bug " &
 355                   "box in the report.");
 356                End_Line;
 357
 358                Write_Str
 359                  ("| Include the exact gcc or gnatmake command " &
 360                   "that you entered.");
 361                End_Line;
 362
 363                Write_Str
 364                  ("| Also include sources listed below in gnatchop format");
 365                End_Line;
 366
 367                Write_Str
 368                  ("| (concatenated together with no headers between files).");
 369                End_Line;
 370
 371                if not Is_FSF_Version then
 372                   Write_Str
 373                     ("| Use plain ASCII or MIME attachment.");
 374                   End_Line;
 375                end if;
 376             end if;
 377          end;
 378
 379          --  Complete output of bug box
 380
 381          Write_Char ('+');
 382          Repeat_Char ('=', 76, '+');
 383          Write_Eol;
 384
 385          if Debug_Flag_3 then
 386             Write_Eol;
 387             Write_Eol;
 388             Print_Tree_Node (Current_Error_Node);
 389             Write_Eol;
 390          end if;
 391
 392          Write_Eol;
 393
 394          Write_Line ("Please include these source files with error report");
 395          Write_Line ("Note that list may not be accurate in some cases, ");
 396          Write_Line ("so please double check that the problem can still ");
 397          Write_Line ("be reproduced with the set of files listed.");
 398          Write_Eol;
 399
 400          for U in Main_Unit .. Last_Unit loop
 401             begin
 402                if not Is_Internal_File_Name
 403                         (File_Name (Source_Index (U)))
 404                then
 405                   Write_Name (Full_File_Name (Source_Index (U)));
 406                   Write_Eol;
 407                end if;
 408
 409             --  No point in double bug box if we blow up trying to print
 410             --  the list of file names! Output informative msg and quit.
 411
 412             exception
 413                when others =>
 414                   Write_Str ("list may be incomplete");
 415                   exit;
 416             end;
 417          end loop;
 418
 419          Write_Eol;
 420          Set_Standard_Output;
 421
 422          Tree_Dump;
 423          Source_Dump;
 424          raise Unrecoverable_Error;
 425       end if;
 426
 427    end Compiler_Abort;
 428
 429    -----------------
 430    -- Repeat_Char --
 431    -----------------
 432
 433    procedure Repeat_Char (Char : Character; Col : Nat; After : Character) is
 434    begin
 435       while Column < Col loop
 436          Write_Char (Char);
 437       end loop;
 438
 439       Write_Char (After);
 440    end Repeat_Char;
 441
 442 end Comperr;