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) 1992-2016, 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 error
  27 --  is detected. Calls to these routines cause termination of the current
  28 --  compilation with appropriate error output.
  29
  30 with Atree;    use Atree;
  31 with Debug;    use Debug;
  32 with Errout;   use Errout;
  33 with Gnatvsn;  use Gnatvsn;
  34 with Lib;      use Lib;
  35 with Namet;    use Namet;
  36 with Opt;      use Opt;
  37 with Osint;    use Osint;
  38 with Output;   use Output;
  39 with Sinfo;    use Sinfo;
  40 with Sinput;   use Sinput;
  41 with Sprint;   use Sprint;
  42 with Sdefault; use Sdefault;
  43 with Treepr;   use Treepr;
  44 with Types;    use Types;
  45
  46 with Ada.Exceptions; use Ada.Exceptions;
  47
  48 with System.OS_Lib;     use System.OS_Lib;
  49 with System.Soft_Links; use System.Soft_Links;
  50
  51 package body Comperr is
  52
  53    ----------------
  54    -- Local Data --
  55    ----------------
  56
  57    Abort_In_Progress : Boolean := False;
  58    --  Used to prevent runaway recursion if something segfaults
  59    --  while processing a previous abort.
  60
  61    -----------------------
  62    -- Local Subprograms --
  63    -----------------------
  64
  65    procedure Repeat_Char (Char : Character; Col : Nat; After : Character);
  66    --  Output Char until current column is at or past Col, and then output
  67    --  the character given by After (if column is already past Col on entry,
  68    --  then the effect is simply to output the After character).
  69
  70    --------------------
  71    -- Compiler_Abort --
  72    --------------------
  73
  74    procedure Compiler_Abort
  75      (X            : String;
  76       Fallback_Loc : String  := "";
  77       From_GCC     : Boolean := False)
  78    is
  79       --  The procedures below output a "bug box" with information about
  80       --  the cause of the compiler abort and about the preferred method
  81       --  of reporting bugs. The default is a bug box appropriate for
  82       --  the FSF version of GNAT, but there are specializations for
  83       --  the GNATPRO and Public releases by AdaCore.
  84
  85       XF : constant Positive := X'First;
  86       --  Start index, usually 1, but we won't assume this
  87
  88       procedure End_Line;
  89       --  Add blanks up to column 76, and then a final vertical bar
  90
  91       --------------
  92       -- End_Line --
  93       --------------
  94
  95       procedure End_Line is
  96       begin
  97          Repeat_Char (' ', 76, '|');
  98          Write_Eol;
  99       end End_Line;
 100
 101       Is_GPL_Version : constant Boolean := Gnatvsn.Build_Type = GPL;
 102       Is_FSF_Version : constant Boolean := Gnatvsn.Build_Type = FSF;
 103
 104    --  Start of processing for Compiler_Abort
 105
 106    begin
 107       Cancel_Special_Output;
 108
 109       --  Prevent recursion through Compiler_Abort, e.g. via SIGSEGV
 110
 111       if Abort_In_Progress then
 112          Exit_Program (E_Abort);
 113       end if;
 114
 115       Abort_In_Progress := True;
 116
 117       --  Generate a "standard" error message instead of a bug box in case
 118       --  of CodePeer rather than generating a bug box, friendlier.
 119
 120       --  Note that the call to Error_Msg_N below sets Serious_Errors_Detected
 121       --  to 1, so we use the regular mechanism below in order to display a
 122       --  "compilation abandoned" message and exit, so we still know we have
 123       --  this case (and -gnatdk can still be used to get the bug box).
 124
 125       if CodePeer_Mode
 126         and then Serious_Errors_Detected = 0
 127         and then not Debug_Flag_K
 128         and then Sloc (Current_Error_Node) > No_Location
 129       then
 130          Error_Msg_N ("cannot generate 'S'C'I'L", Current_Error_Node);
 131       end if;
 132
 133       --  If we are in CodePeer mode, we must also delete SCIL files
 134
 135       if CodePeer_Mode then
 136          Delete_SCIL_Files;
 137       end if;
 138
 139       --  If any errors have already occurred, then we guess that the abort
 140       --  may well be caused by previous errors, and we don't make too much
 141       --  fuss about it, since we want to let programmer fix the errors first.
 142
 143       --  Debug flag K disables this behavior (useful for debugging)
 144
 145       if Serious_Errors_Detected /= 0 and then not Debug_Flag_K then
 146          Errout.Finalize (Last_Call => True);
 147          Errout.Output_Messages;
 148
 149          Set_Standard_Error;
 150          Write_Str ("compilation abandoned due to previous error");
 151          Write_Eol;
 152
 153          Set_Standard_Output;
 154          Source_Dump;
 155          Tree_Dump;
 156          Exit_Program (E_Errors);
 157
 158       --  Otherwise give message with details of the abort
 159
 160       else
 161          Set_Standard_Error;
 162
 163          --  Generate header for bug box
 164
 165          Write_Char ('+');
 166          Repeat_Char ('=', 29, 'G');
 167          Write_Str ("NAT BUG DETECTED");
 168          Repeat_Char ('=', 76, '+');
 169          Write_Eol;
 170
 171          --  Output GNAT version identification
 172
 173          Write_Str ("| ");
 174          Write_Str (Gnat_Version_String);
 175          Write_Str (" (");
 176
 177          --  Output target name, deleting junk final reverse slash
 178
 179          if Target_Name.all (Target_Name.all'Last) = '\'
 180            or else Target_Name.all (Target_Name.all'Last) = '/'
 181          then
 182             Write_Str (Target_Name.all (1 .. Target_Name.all'Last - 1));
 183          else
 184             Write_Str (Target_Name.all);
 185          end if;
 186
 187          --  Output identification of error
 188
 189          Write_Str (") ");
 190
 191          if X'Length + Column > 76 then
 192             if From_GCC then
 193                Write_Str ("GCC error:");
 194             end if;
 195
 196             End_Line;
 197
 198             Write_Str ("| ");
 199          end if;
 200
 201          if X'Length > 70 then
 202             declare
 203                Last_Blank : Integer := 70;
 204
 205             begin
 206                for P in 39 .. 68 loop
 207                   if X (XF + P) = ' ' then
 208                      Last_Blank := P;
 209                   end if;
 210                end loop;
 211
 212                Write_Str (X (XF .. XF - 1 + Last_Blank));
 213                End_Line;
 214                Write_Str ("|    ");
 215                Write_Str (X (XF + Last_Blank .. X'Last));
 216             end;
 217          else
 218             Write_Str (X);
 219          end if;
 220
 221          if not From_GCC then
 222
 223             --  For exception case, get exception message from the TSD. Note
 224             --  that it would be neater and cleaner to pass the exception
 225             --  message (obtained from Exception_Message) as a parameter to
 226             --  Compiler_Abort, but we can't do this quite yet since it would
 227             --  cause bootstrap path problems for 3.10 to 3.11.
 228
 229             Write_Char (' ');
 230             Write_Str (Exception_Message (Get_Current_Excep.all.all));
 231          end if;
 232
 233          End_Line;
 234
 235          --  Output source location information
 236
 237          if Sloc (Current_Error_Node) <= No_Location then
 238             if Fallback_Loc'Length > 0 then
 239                Write_Str ("| Error detected around ");
 240                Write_Str (Fallback_Loc);
 241             else
 242                Write_Str ("| No source file position information available");
 243             end if;
 244
 245             End_Line;
 246          else
 247             Write_Str ("| Error detected at ");
 248             Write_Location (Sloc (Current_Error_Node));
 249             End_Line;
 250          end if;
 251
 252          --  There are two cases now. If the file gnat_bug.box exists,
 253          --  we use the contents of this file at this point.
 254
 255          declare
 256             FD  : File_Descriptor;
 257             Lo  : Source_Ptr;
 258             Hi  : Source_Ptr;
 259             Src : Source_Buffer_Ptr;
 260
 261          begin
 262             Namet.Unlock;
 263             Name_Buffer (1 .. 12) := "gnat_bug.box";
 264             Name_Len := 12;
 265             Read_Source_File (Name_Enter, 0, Hi, Src, FD);
 266
 267             --  If we get a Src file, we use it
 268
 269             if not Null_Source_Buffer_Ptr (Src) then
 270                Lo := 0;
 271
 272                Outer : while Lo < Hi loop
 273                   Write_Str ("| ");
 274
 275                   Inner : loop
 276                      exit Inner when Src (Lo) = ASCII.CR
 277                        or else Src (Lo) = ASCII.LF;
 278                      Write_Char (Src (Lo));
 279                      Lo := Lo + 1;
 280                   end loop Inner;
 281
 282                   End_Line;
 283
 284                   while Lo <= Hi
 285                     and then (Src (Lo) = ASCII.CR
 286                                 or else Src (Lo) = ASCII.LF)
 287                   loop
 288                      Lo := Lo + 1;
 289                   end loop;
 290                end loop Outer;
 291
 292             --  Otherwise we use the standard fixed text
 293
 294             else
 295                if Is_FSF_Version then
 296                   Write_Str
 297                     ("| Please submit a bug report; see" &
 298                      " https://gcc.gnu.org/bugs/ .");
 299                   End_Line;
 300
 301                elsif Is_GPL_Version then
 302
 303                   Write_Str
 304                     ("| Please submit a bug report by email " &
 305                      "to report@adacore.com.");
 306                   End_Line;
 307
 308                   Write_Str
 309                     ("| GAP members can alternatively use GNAT Tracker:");
 310                   End_Line;
 311
 312                   Write_Str
 313                     ("| http://www.adacore.com/ " &
 314                      "section 'send a report'.");
 315                   End_Line;
 316
 317                   Write_Str
 318                     ("| See gnatinfo.txt for full info on procedure " &
 319                      "for submitting bugs.");
 320                   End_Line;
 321
 322                else
 323                   Write_Str
 324                     ("| Please submit a bug report using GNAT Tracker:");
 325                   End_Line;
 326
 327                   Write_Str
 328                     ("| http://www.adacore.com/gnattracker/ " &
 329                      "section 'send a report'.");
 330                   End_Line;
 331
 332                   Write_Str
 333                     ("| alternatively submit a bug report by email " &
 334                      "to report@adacore.com,");
 335                   End_Line;
 336
 337                   Write_Str
 338                     ("| including your customer number #nnn " &
 339                      "in the subject line.");
 340                   End_Line;
 341                end if;
 342
 343                Write_Str
 344                  ("| Use a subject line meaningful to you" &
 345                   " and us to track the bug.");
 346                End_Line;
 347
 348                Write_Str
 349                  ("| Include the entire contents of this bug " &
 350                   "box in the report.");
 351                End_Line;
 352
 353                Write_Str
 354                  ("| Include the exact command that you entered.");
 355                End_Line;
 356
 357                Write_Str
 358                  ("| Also include sources listed below.");
 359                End_Line;
 360
 361                if not Is_FSF_Version then
 362                   Write_Str
 363                     ("| Use plain ASCII or MIME attachment(s).");
 364                   End_Line;
 365                end if;
 366             end if;
 367          end;
 368
 369          --  Complete output of bug box
 370
 371          Write_Char ('+');
 372          Repeat_Char ('=', 76, '+');
 373          Write_Eol;
 374
 375          if Debug_Flag_3 then
 376             Write_Eol;
 377             Write_Eol;
 378             Print_Tree_Node (Current_Error_Node);
 379             Write_Eol;
 380          end if;
 381
 382          Write_Eol;
 383
 384          Write_Line ("Please include these source files with error report");
 385          Write_Line ("Note that list may not be accurate in some cases, ");
 386          Write_Line ("so please double check that the problem can still ");
 387          Write_Line ("be reproduced with the set of files listed.");
 388          Write_Line ("Consider also -gnatd.n switch (see debug.adb).");
 389          Write_Eol;
 390
 391          begin
 392             Dump_Source_File_Names;
 393
 394          --  If we blow up trying to print the list of file names, just output
 395          --  informative msg and continue.
 396
 397          exception
 398             when others =>
 399                Write_Str ("list may be incomplete");
 400          end;
 401
 402          Write_Eol;
 403          Set_Standard_Output;
 404
 405          Tree_Dump;
 406          Source_Dump;
 407          raise Unrecoverable_Error;
 408       end if;
 409    end Compiler_Abort;
 410
 411    -----------------------
 412    -- Delete_SCIL_Files --
 413    -----------------------
 414
 415    procedure Delete_SCIL_Files is
 416       Main      : Node_Id;
 417       Unit_Name : Node_Id;
 418
 419       Success : Boolean;
 420       pragma Unreferenced (Success);
 421
 422       procedure Decode_Name_Buffer;
 423       --  Replace "__" by "." in Name_Buffer, and adjust Name_Len accordingly
 424
 425       ------------------------
 426       -- Decode_Name_Buffer --
 427       ------------------------
 428
 429       procedure Decode_Name_Buffer is
 430          J : Natural;
 431          K : Natural;
 432
 433       begin
 434          J := 1;
 435          K := 0;
 436          while J <= Name_Len loop
 437             K := K + 1;
 438
 439             if J < Name_Len
 440               and then Name_Buffer (J) = '_'
 441               and then Name_Buffer (J + 1) = '_'
 442             then
 443                Name_Buffer (K) := '.';
 444                J := J + 1;
 445             else
 446                Name_Buffer (K) := Name_Buffer (J);
 447             end if;
 448
 449             J := J + 1;
 450          end loop;
 451
 452          Name_Len := K;
 453       end Decode_Name_Buffer;
 454
 455    --  Start of processing for Delete_SCIL_Files
 456
 457    begin
 458       --  If parsing was not successful, no Main_Unit is available, so return
 459       --  immediately.
 460
 461       if Main_Source_File <= No_Source_File then
 462          return;
 463       end if;
 464
 465       --  Retrieve unit name, and remove old versions of SCIL/<unit>.scil and
 466       --  SCIL/<unit>__body.scil, ditto for .scilx files.
 467
 468       Main := Unit (Cunit (Main_Unit));
 469
 470       case Nkind (Main) is
 471          when N_Package_Declaration
 472             | N_Subprogram_Body
 473             | N_Subprogram_Declaration
 474          =>
 475             Unit_Name := Defining_Unit_Name (Specification (Main));
 476
 477          when N_Package_Body =>
 478             Unit_Name := Corresponding_Spec (Main);
 479
 480          when N_Package_Instantiation
 481             | N_Package_Renaming_Declaration
 482          =>
 483             Unit_Name := Defining_Unit_Name (Main);
 484
 485          --  No SCIL file generated for generic package declarations
 486
 487          when N_Generic_Package_Declaration =>
 488             return;
 489
 490          --  Should never happen, but can be ignored in production
 491
 492          when others =>
 493             pragma Assert (False);
 494             return;
 495       end case;
 496
 497       case Nkind (Unit_Name) is
 498          when N_Defining_Identifier =>
 499             Get_Name_String (Chars (Unit_Name));
 500
 501          when N_Defining_Program_Unit_Name =>
 502             Get_Name_String (Chars (Defining_Identifier (Unit_Name)));
 503             Decode_Name_Buffer;
 504
 505          --  Should never happen, but can be ignored in production
 506
 507          when others =>
 508             pragma Assert (False);
 509             return;
 510       end case;
 511
 512       Delete_File
 513         ("SCIL/" & Name_Buffer (1 .. Name_Len) & ".scil", Success);
 514       Delete_File
 515         ("SCIL/" & Name_Buffer (1 .. Name_Len) & ".scilx", Success);
 516       Delete_File
 517         ("SCIL/" & Name_Buffer (1 .. Name_Len) & "__body.scil", Success);
 518       Delete_File
 519         ("SCIL/" & Name_Buffer (1 .. Name_Len) & "__body.scilx", Success);
 520    end Delete_SCIL_Files;
 521
 522    -----------------
 523    -- Repeat_Char --
 524    -----------------
 525
 526    procedure Repeat_Char (Char : Character; Col : Nat; After : Character) is
 527    begin
 528       while Column < Col loop
 529          Write_Char (Char);
 530       end loop;
 531
 532       Write_Char (After);
 533    end Repeat_Char;
 534
 535 end Comperr;