vm/debug.cpp

   1 #include "master.hpp"
   2
   3 namespace factor
   4 {
   5
   6 std::ostream &operator<<(std::ostream &out, const string *str)
   7 {
   8         for(cell i = 0; i < string_capacity(str); i++)
   9                 out << (char)str->data()[i];
  10         return out;
  11 }
  12
  13 void factor_vm::print_word(word *word, cell nesting)
  14 {
  15         if(tagged<object>(word->vocabulary).type_p(STRING_TYPE))
  16                 std::cout << untag<string>(word->vocabulary) << ":";
  17
  18         if(tagged<object>(word->name).type_p(STRING_TYPE))
  19                 std::cout << untag<string>(word->name);
  20         else
  21         {
  22                 std::cout << "#<not a string: ";
  23                 print_nested_obj(word->name,nesting);
  24                 std::cout << ">";
  25         }
  26 }
  27
  28 void factor_vm::print_factor_string(string *str)
  29 {
  30         std::cout << '"' << str << '"';
  31 }
  32
  33 void factor_vm::print_array(array *array, cell nesting)
  34 {
  35         cell length = array_capacity(array);
  36         cell i;
  37         bool trimmed;
  38
  39         if(length > 10 && !full_output)
  40         {
  41                 trimmed = true;
  42                 length = 10;
  43         }
  44         else
  45                 trimmed = false;
  46
  47         for(i = 0; i < length; i++)
  48         {
  49                 std::cout << " ";
  50                 print_nested_obj(array_nth(array,i),nesting);
  51         }
  52
  53         if(trimmed)
  54                 std::cout << "...";
  55 }
  56
  57 void factor_vm::print_alien(alien *alien, cell nesting)
  58 {
  59         if (to_boolean(alien->expired))
  60                 std::cout << "#<expired alien>";
  61         else if (to_boolean(alien->base))
  62         {
  63                 std::cout << "#<displaced alien " << alien->displacement << "+";
  64                 print_nested_obj(alien->base, nesting);
  65                 std::cout << ">";
  66         }
  67         else
  68         {
  69                 std::cout << "#<alien " << (void*)alien->address << ">";
  70         }
  71 }
  72
  73 void factor_vm::print_byte_array(byte_array *array, cell nesting)
  74 {
  75         cell length = array->capacity;
  76         cell i;
  77         bool trimmed;
  78         unsigned char *data = array->data<unsigned char>();
  79
  80         if(length > 16 && !full_output)
  81         {
  82                 trimmed = true;
  83                 length = 16;
  84         }
  85         else
  86                 trimmed = false;
  87
  88         for(i = 0; i < length; i++)
  89         {
  90                 std::cout << " " << (unsigned)data[i];
  91         }
  92
  93         if(trimmed)
  94                 std::cout << "...";
  95 }
  96
  97 void factor_vm::print_tuple(tuple *tuple, cell nesting)
  98 {
  99         tuple_layout *layout = untag<tuple_layout>(tuple->layout);
 100         cell length = to_fixnum(layout->size);
 101
 102         std::cout << " ";
 103         print_nested_obj(layout->klass,nesting);
 104
 105         bool trimmed;
 106         if(length > 10 && !full_output)
 107         {
 108                 trimmed = true;
 109                 length = 10;
 110         }
 111         else
 112                 trimmed = false;
 113
 114         for(cell i = 0; i < length; i++)
 115         {
 116                 std::cout << " ";
 117                 print_nested_obj(tuple->data()[i],nesting);
 118         }
 119
 120         if(trimmed)
 121                 std::cout << "...";
 122 }
 123
 124 void factor_vm::print_nested_obj(cell obj, fixnum nesting)
 125 {
 126         if(nesting <= 0 && !full_output)
 127         {
 128                 std::cout << " ... ";
 129                 return;
 130         }
 131
 132         quotation *quot;
 133
 134         switch(tagged<object>(obj).type())
 135         {
 136         case FIXNUM_TYPE:
 137                 std::cout << untag_fixnum(obj);
 138                 break;
 139         case FLOAT_TYPE:
 140                 std::cout << untag_float(obj);
 141                 break;
 142         case WORD_TYPE:
 143                 print_word(untag<word>(obj),nesting - 1);
 144                 break;
 145         case STRING_TYPE:
 146                 print_factor_string(untag<string>(obj));
 147                 break;
 148         case F_TYPE:
 149                 std::cout << "f";
 150                 break;
 151         case TUPLE_TYPE:
 152                 std::cout << "T{";
 153                 print_tuple(untag<tuple>(obj),nesting - 1);
 154                 std::cout << " }";
 155                 break;
 156         case WRAPPER_TYPE:
 157                 std::cout << "W{ ";
 158                 print_nested_obj(untag<wrapper>(obj)->object,nesting - 1);
 159                 std::cout << " }";
 160                 break;
 161         case BYTE_ARRAY_TYPE:
 162                 std::cout << "B{";
 163                 print_byte_array(untag<byte_array>(obj),nesting - 1);
 164                 std::cout << " }";
 165                 break;
 166         case ARRAY_TYPE:
 167                 std::cout << "{";
 168                 print_array(untag<array>(obj),nesting - 1);
 169                 std::cout << " }";
 170                 break;
 171         case QUOTATION_TYPE:
 172                 std::cout << "[";
 173                 quot = untag<quotation>(obj);
 174                 print_array(untag<array>(quot->array),nesting - 1);
 175                 std::cout << " ]";
 176                 break;
 177         case ALIEN_TYPE:
 178                 print_alien(untag<alien>(obj), nesting - 1);
 179                 break;
 180         default:
 181                 std::cout << "#<" << type_name(tagged<object>(obj).type()) << " @ ";
 182                 std::cout << (void*)obj << ">";
 183                 break;
 184         }
 185 }
 186
 187 void factor_vm::print_obj(cell obj)
 188 {
 189         print_nested_obj(obj,10);
 190 }
 191
 192 void factor_vm::print_objects(cell *start, cell *end)
 193 {
 194         for(; start <= end; start++)
 195         {
 196                 print_obj(*start);
 197                 std::cout << std::endl;
 198         }
 199 }
 200
 201 void factor_vm::print_datastack()
 202 {
 203         std::cout << "==== DATA STACK:" << std::endl;
 204         if (ctx)
 205                 print_objects((cell *)ctx->datastack_seg->start,(cell *)ctx->datastack);
 206         else
 207                 std::cout << "*** Context not initialized" << std::endl;
 208 }
 209
 210 void factor_vm::print_retainstack()
 211 {
 212         std::cout << "==== RETAIN STACK:" << std::endl;
 213         if (ctx)
 214                 print_objects((cell *)ctx->retainstack_seg->start,(cell *)ctx->retainstack);
 215         else
 216                 std::cout << "*** Context not initialized" << std::endl;
 217 }
 218
 219 struct stack_frame_printer {
 220         factor_vm *parent;
 221
 222         explicit stack_frame_printer(factor_vm *parent_) : parent(parent_) {}
 223         void operator()(void *frame_top, code_block *owner, void *addr)
 224         {
 225                 std::cout << std::endl;
 226                 std::cout << "frame: " << frame_top << std::endl;
 227                 std::cout << "executing: ";
 228                 parent->print_obj(owner->owner);
 229                 std::cout << std::endl;
 230                 std::cout << "scan: ";
 231                 parent->print_obj(owner->scan(parent, addr));
 232                 std::cout << std::endl;
 233                 std::cout << "word/quot addr: ";
 234                 std::cout << std::hex << (cell)owner->owner << std::dec;
 235                 std::cout << std::endl;
 236                 std::cout << "word/quot xt: ";
 237                 std::cout << std::hex << (cell)owner->entry_point() << std::dec;
 238                 std::cout << std::endl;
 239                 std::cout << "return address: ";
 240                 std::cout << std::hex << (cell)addr << std::dec;
 241                 std::cout << std::endl;
 242         }
 243 };
 244
 245 void factor_vm::print_callstack()
 246 {
 247         std::cout << "==== CALL STACK:" << std::endl;
 248         if (ctx)
 249         {
 250                 stack_frame_printer printer(this);
 251                 iterate_callstack_reversed(ctx,printer);
 252         }
 253         else
 254                 std::cout << "*** Context not initialized" << std::endl;
 255 }
 256
 257 struct padded_address {
 258         cell value;
 259
 260         explicit padded_address(cell value_) : value(value_) {}
 261 };
 262
 263 std::ostream &operator<<(std::ostream &out, const padded_address &value)
 264 {
 265         char prev = out.fill('0');
 266         out.width(sizeof(cell) * 2);
 267         out << std::hex << value.value << std::dec;
 268         out.fill(prev);
 269         return out;
 270 }
 271
 272 void factor_vm::dump_cell(cell x)
 273 {
 274         std::cout << padded_address(x) << ": ";
 275         x = *(cell *)x;
 276         std::cout << padded_address(x) << " tag " << TAG(x) << std::endl;
 277 }
 278
 279 void factor_vm::dump_memory(cell from, cell to)
 280 {
 281         from = UNTAG(from);
 282
 283         for(; from <= to; from += sizeof(cell))
 284                 dump_cell(from);
 285 }
 286
 287 template<typename Generation>
 288 void factor_vm::dump_generation(const char *name, Generation *gen)
 289 {
 290         std::cout << name << ": ";
 291         std::cout << "Start=" << gen->start;
 292         std::cout << ", size=" << gen->size;
 293         std::cout << ", end=" << gen->end;
 294         std::cout << std::endl;
 295 }
 296
 297 void factor_vm::dump_generations()
 298 {
 299         std::cout << std::hex;
 300
 301         dump_generation("Nursery",&nursery);
 302         dump_generation("Aging",data->aging);
 303         dump_generation("Tenured",data->tenured);
 304
 305         std::cout << "Cards:";
 306         std::cout << "base=" << (cell)data->cards << ", ";
 307         std::cout << "size=" << (cell)(data->cards_end - data->cards) << std::endl;
 308
 309         std::cout << std::dec;
 310 }
 311
 312 struct object_dumper {
 313         factor_vm *parent;
 314         cell type;
 315
 316         explicit object_dumper(factor_vm *parent_, cell type_) :
 317                 parent(parent_), type(type_) {}
 318
 319         void operator()(object *obj)
 320         {
 321                 if(type == TYPE_COUNT || obj->type() == type)
 322                 {
 323                         std::cout << padded_address((cell)obj) << " ";
 324                         parent->print_nested_obj(tag_dynamic(obj),2);
 325                         std::cout << std::endl;
 326                 }
 327         }
 328 };
 329
 330 void factor_vm::dump_objects(cell type)
 331 {
 332         primitive_full_gc();
 333         object_dumper dumper(this,type);
 334         each_object(dumper);
 335 }
 336
 337 struct find_data_reference_slot_visitor {
 338         cell look_for;
 339         object *obj;
 340         factor_vm *parent;
 341
 342         explicit find_data_reference_slot_visitor(cell look_for_, object *obj_, factor_vm *parent_) :
 343                 look_for(look_for_), obj(obj_), parent(parent_) { }
 344
 345         void operator()(cell *scan)
 346         {
 347                 if(look_for == *scan)
 348                 {
 349                         std::cout << padded_address((cell)obj) << " ";
 350                         parent->print_nested_obj(tag_dynamic(obj),2);
 351                         std::cout << std::endl;
 352                 }
 353         }
 354 };
 355
 356 struct dump_edges_slot_visitor {
 357         object *obj;
 358         factor_vm *parent;
 359
 360         explicit dump_edges_slot_visitor(cell, object *obj_, factor_vm *parent_) :
 361                 obj(obj_), parent(parent_) { }
 362
 363         void operator()(cell *scan)
 364         {
 365                 if (TAG(*scan) > F_TYPE)
 366                         std::cout << (void*)tag_dynamic(obj) << " ==> " << (void*)*scan << std::endl;
 367         }
 368 };
 369
 370 template <typename SlotVisitor>
 371 struct data_reference_object_visitor {
 372         cell look_for;
 373         factor_vm *parent;
 374
 375         explicit data_reference_object_visitor(cell look_for_, factor_vm *parent_) :
 376                 look_for(look_for_), parent(parent_) {}
 377
 378         void operator()(object *obj)
 379         {
 380                 SlotVisitor visitor(look_for,obj,parent);
 381                 obj->each_slot(visitor);
 382         }
 383 };
 384
 385 void factor_vm::find_data_references(cell look_for)
 386 {
 387         data_reference_object_visitor<find_data_reference_slot_visitor> visitor(look_for,this);
 388         each_object(visitor);
 389 }
 390
 391 void factor_vm::dump_edges()
 392 {
 393         data_reference_object_visitor<dump_edges_slot_visitor> visitor(0,this);
 394         each_object(visitor);
 395 }
 396
 397 struct code_block_printer {
 398         factor_vm *parent;
 399         cell reloc_size, parameter_size;
 400
 401         explicit code_block_printer(factor_vm *parent_) :
 402                 parent(parent_), reloc_size(0), parameter_size(0) {}
 403
 404         void operator()(code_block *scan, cell size)
 405         {
 406                 const char *status;
 407                 if(scan->free_p())
 408                         status = "free";
 409                 else
 410                 {
 411                         reloc_size += parent->object_size(scan->relocation);
 412                         parameter_size += parent->object_size(scan->parameters);
 413
 414                         if(parent->code->marked_p(scan))
 415                                 status = "marked";
 416                         else
 417                                 status = "allocated";
 418
 419                         std::cout << std::hex << (cell)scan << std::dec << " ";
 420                         std::cout << std::hex << size << std::dec << " ";
 421                         std::cout << status << " ";
 422                         std::cout << "stack frame " << scan->stack_frame_size();
 423                         std::cout << std::endl;
 424                 }
 425         }
 426 };
 427
 428 /* Dump all code blocks for debugging */
 429 void factor_vm::dump_code_heap()
 430 {
 431         code_block_printer printer(this);
 432         code->allocator->iterate(printer);
 433         std::cout << printer.reloc_size << " bytes used by relocation tables" << std::endl;
 434         std::cout << printer.parameter_size << " bytes used by parameter tables" << std::endl;
 435 }
 436
 437 void factor_vm::factorbug_usage(bool advanced_p)
 438 {
 439         std::cout << "Basic commands:" << std::endl;
 440 #ifdef WINDOWS
 441         std::cout << "  q ^Z             -- quit Factor" << std::endl;
 442 #else
 443         std::cout << "  q ^D             -- quit Factor" << std::endl;
 444 #endif
 445         std::cout << "  c                -- continue executing Factor - NOT SAFE" << std::endl;
 446         std::cout << "  t                -- throw exception in Factor - NOT SAFE" << std::endl;
 447         std::cout << "  .s .r .c         -- print data, retain, call stacks" << std::endl;
 448         if (advanced_p)
 449         {
 450                 std::cout << "  help             -- reprint this message" << std::endl;
 451                 std::cout << "Advanced commands:" << std::endl;
 452                 std::cout << "  e                -- dump environment" << std::endl;
 453                 std::cout << "  d <addr> <count> -- dump memory" << std::endl;
 454                 std::cout << "  u <addr>         -- dump object at tagged <addr>" << std::endl;
 455                 std::cout << "  . <addr>         -- print object at tagged <addr>" << std::endl;
 456                 std::cout << "  g                -- dump generations" << std::endl;
 457                 std::cout << "  ds dr            -- dump data, retain stacks" << std::endl;
 458                 std::cout << "  trim             -- toggle output trimming" << std::endl;
 459                 std::cout << "  data             -- data heap dump" << std::endl;
 460                 std::cout << "  words            -- words dump" << std::endl;
 461                 std::cout << "  tuples           -- tuples dump" << std::endl;
 462                 std::cout << "  edges            -- print all object-to-object references" << std::endl;
 463                 std::cout << "  refs <addr>      -- find data heap references to object" << std::endl;
 464                 std::cout << "  push <addr>      -- push object on data stack - NOT SAFE" << std::endl;
 465                 std::cout << "  gc               -- trigger full GC - NOT SAFE" << std::endl;
 466                 std::cout << "  compact-gc       -- trigger compacting GC - NOT SAFE" << std::endl;
 467                 std::cout << "  code             -- code heap dump" << std::endl;
 468                 std::cout << "  abort            -- call abort()" << std::endl;
 469                 std::cout << "  breakpoint       -- trigger system breakpoint" << std::endl;
 470         }
 471         else
 472         {
 473                 std::cout << "  help             -- full help, including advanced commands" << std::endl;
 474         }
 475
 476         std::cout << std::endl;
 477
 478 }
 479
 480 static void exit_fep(factor_vm *vm)
 481 {
 482         vm->unlock_console();
 483         vm->handle_ctrl_c();
 484         vm->fep_p = false;
 485 }
 486
 487 void factor_vm::factorbug()
 488 {
 489         if(fep_disabled)
 490         {
 491                 std::cout << "Low level debugger disabled" << std::endl;
 492                 exit(1);
 493         }
 494
 495         if (sampling_profiler_p)
 496                 end_sampling_profiler();
 497
 498         fep_p = true;
 499
 500         std::cout << "Starting low level debugger..." << std::endl;
 501
 502         // Even though we've stopped the VM, the stdin_loop thread (see os-*.cpp)
 503         // that pumps the console is still running concurrently. We lock a mutex so
 504         // the thread will take a break and give us exclusive access to stdin.
 505         lock_console();
 506         ignore_ctrl_c();
 507
 508         if (!fep_help_was_shown) {
 509                 factorbug_usage(false);
 510                 fep_help_was_shown = true;
 511         }
 512         bool seen_command = false;
 513
 514         for(;;)
 515         {
 516                 char cmd[1024];
 517
 518                 std::cout << "> " << std::flush;
 519
 520                 std::cin >> std::setw(1024) >> cmd >> std::setw(0);
 521                 if(!std::cin.good())
 522                 {
 523                         if(!seen_command)
 524                         {
 525                                 /* If we exit with an EOF immediately, then
 526                                 dump stacks. This is useful for builder and
 527                                 other cases where Factor is run with stdin
 528                                 redirected to /dev/null */
 529                                 fep_disabled = true;
 530
 531                                 print_datastack();
 532                                 print_retainstack();
 533                                 print_callstack();
 534                         }
 535
 536                         exit(1);
 537                 }
 538
 539                 seen_command = true;
 540
 541                 if(strcmp(cmd,"q") == 0)
 542                         exit(1);
 543                 if(strcmp(cmd,"d") == 0)
 544                 {
 545                         cell addr = read_cell_hex();
 546                         if (std::cin.peek() == ' ')
 547                                 std::cin.ignore();
 548
 549                         if(!std::cin.good()) break;
 550                         cell count = read_cell_hex();
 551                         dump_memory(addr,addr+count);
 552                 }
 553                 else if(strcmp(cmd,"u") == 0)
 554                 {
 555                         cell addr = read_cell_hex();
 556                         cell count = object_size(addr);
 557                         dump_memory(addr,addr+count);
 558                 }
 559                 else if(strcmp(cmd,".") == 0)
 560                 {
 561                         cell addr = read_cell_hex();
 562                         print_obj(addr);
 563                         std::cout << std::endl;
 564                 }
 565                 else if(strcmp(cmd,"trim") == 0)
 566                         full_output = !full_output;
 567                 else if(strcmp(cmd,"ds") == 0)
 568                         dump_memory(ctx->datastack_seg->start,ctx->datastack);
 569                 else if(strcmp(cmd,"dr") == 0)
 570                         dump_memory(ctx->retainstack_seg->start,ctx->retainstack);
 571                 else if(strcmp(cmd,".s") == 0)
 572                         print_datastack();
 573                 else if(strcmp(cmd,".r") == 0)
 574                         print_retainstack();
 575                 else if(strcmp(cmd,".c") == 0)
 576                         print_callstack();
 577                 else if(strcmp(cmd,"e") == 0)
 578                 {
 579                         for(cell i = 0; i < special_object_count; i++)
 580                                 dump_cell((cell)&special_objects[i]);
 581                 }
 582                 else if(strcmp(cmd,"g") == 0)
 583                         dump_generations();
 584                 else if(strcmp(cmd,"c") == 0)
 585                 {
 586                         exit_fep(this);
 587                         return;
 588                 }
 589                 else if(strcmp(cmd,"t") == 0)
 590                 {
 591                         exit_fep(this);
 592                         general_error(ERROR_INTERRUPT,false_object,false_object);
 593                         FACTOR_ASSERT(false);
 594                 }
 595                 else if(strcmp(cmd,"data") == 0)
 596                         dump_objects(TYPE_COUNT);
 597                 else if(strcmp(cmd,"edges") == 0)
 598                         dump_edges();
 599                 else if(strcmp(cmd,"refs") == 0)
 600                 {
 601                         cell addr = read_cell_hex();
 602                         std::cout << "Data heap references:" << std::endl;
 603                         find_data_references(addr);
 604                         std::cout << std::endl;
 605                 }
 606                 else if(strcmp(cmd,"words") == 0)
 607                         dump_objects(WORD_TYPE);
 608                 else if(strcmp(cmd,"tuples") == 0)
 609                         dump_objects(TUPLE_TYPE);
 610                 else if(strcmp(cmd,"push") == 0)
 611                 {
 612                         cell addr = read_cell_hex();
 613                         ctx->push(addr);
 614                 }
 615                 else if(strcmp(cmd,"code") == 0)
 616                         dump_code_heap();
 617                 else if(strcmp(cmd,"gc") == 0)
 618                         primitive_full_gc();
 619                 else if(strcmp(cmd,"compact-gc") == 0)
 620                         primitive_compact_gc();
 621                 else if(strcmp(cmd,"help") == 0)
 622                         factorbug_usage(true);
 623                 else if(strcmp(cmd,"abort") == 0)
 624                         abort();
 625                 else if(strcmp(cmd,"breakpoint") == 0)
 626                         breakpoint();
 627                 else
 628                         std::cout << "unknown command" << std::endl;
 629         }
 630 }
 631
 632 void factor_vm::primitive_die()
 633 {
 634         std::cout << "The die word was called by the library. Unless you called it yourself," << std::endl;
 635         std::cout << "you have triggered a bug in Factor. Please report." << std::endl;
 636         factorbug();
 637 }
 638
 639 }