src/runtime/print.c

   1 /* code for low-level debugging/diagnostic output */
   2
   3 /*
   4  * This software is part of the SBCL system. See the README file for
   5  * more information.
   6  *
   7  * This software is derived from the CMU CL system, which was
   8  * written at Carnegie Mellon University and released into the
   9  * public domain. The software is in the public domain and is
  10  * provided with absolutely no warranty. See the COPYING and CREDITS
  11  * files for more information.
  12  */
  13
  14 /*
  15  * FIXME:
  16  *   Some of the code in here (the various
  17  *   foo_slots[], at least) is deeply broken, depending on guessing
  18  *   already out-of-date values instead of getting them from sbcl.h.
  19  */
  20
  21 #include <stdio.h>
  22 #include <string.h>
  23
  24 #include "sbcl.h"
  25 #include "print.h"
  26 #include "runtime.h"
  27
  28 /* This file can be skipped if we're not supporting LDB. */
  29 #if defined(LISP_FEATURE_SB_LDB)
  30
  31 #include "monitor.h"
  32 #include "vars.h"
  33 #include "os.h"
  34 #include "gencgc-alloc-region.h" /* genesis/thread.h needs this */
  35 #include "genesis/static-symbols.h"
  36 #include "genesis/primitive-objects.h"
  37 #include "genesis/static-symbols.h"
  38 #include "genesis/tagnames.h"
  39
  40 static int max_lines = 20, cur_lines = 0;
  41 static int max_depth = 5, brief_depth = 2, cur_depth = 0;
  42 static int max_length = 5;
  43 static boolean dont_descend = 0, skip_newline = 0;
  44 static int cur_clock = 0;
  45
  46 static void print_obj(char *prefix, lispobj obj);
  47
  48 #define NEWLINE_OR_RETURN if (continue_p(1)) newline(NULL); else return;
  49
  50 static void indent(int in)
  51 {
  52     static char *spaces = "                                                                ";
  53
  54     while (in > 64) {
  55         fputs(spaces, stdout);
  56         in -= 64;
  57     }
  58     if (in != 0)
  59         fputs(spaces + 64 - in, stdout);
  60 }
  61
  62 static boolean continue_p(boolean newline)
  63 {
  64     char buffer[256];
  65
  66     if (cur_depth >= max_depth || dont_descend)
  67         return 0;
  68
  69     if (newline) {
  70         if (skip_newline)
  71             skip_newline = 0;
  72         else
  73             putchar('\n');
  74
  75         if (cur_lines >= max_lines) {
  76             printf("More? [y] ");
  77             fflush(stdout);
  78
  79             if (fgets(buffer, sizeof(buffer), stdin)) {
  80                 if (buffer[0] == 'n' || buffer[0] == 'N')
  81                     throw_to_monitor();
  82                 else
  83                     cur_lines = 0;
  84             } else {
  85                 printf("\nUnable to read response, assuming y.\n");
  86                 cur_lines = 0;
  87             }
  88         }
  89     }
  90
  91     return 1;
  92 }
  93
  94 static void newline(char *label)
  95 {
  96     cur_lines++;
  97     if (label != NULL)
  98         fputs(label, stdout);
  99     putchar('\t');
 100     indent(cur_depth * 2);
 101 }
 102
 103
 104 static void brief_fixnum(lispobj obj)
 105 {
 106 #ifndef LISP_FEATURE_ALPHA
 107     printf("%ld", ((long)obj)>>2);
 108 #else
 109     printf("%d", ((s32)obj)>>2);
 110 #endif
 111 }
 112
 113 static void print_fixnum(lispobj obj)
 114 {
 115 #ifndef LISP_FEATURE_ALPHA
 116     printf(": %ld", ((long)obj)>>2);
 117 #else
 118     printf(": %d", ((s32)obj)>>2);
 119 #endif
 120 }
 121
 122 static void brief_otherimm(lispobj obj)
 123 {
 124     int type, c;
 125     char buffer[10];
 126
 127     type = widetag_of(obj);
 128     switch (type) {
 129         case CHARACTER_WIDETAG:
 130             c = (obj>>8)&0xff;
 131             switch (c) {
 132                 case '\0':
 133                     printf("#\\Null");
 134                     break;
 135                 case '\n':
 136                     printf("#\\Newline");
 137                     break;
 138                 case '\b':
 139                     printf("#\\Backspace");
 140                     break;
 141                 case '\177':
 142                     printf("#\\Delete");
 143                     break;
 144                 default:
 145                     strcpy(buffer, "#\\");
 146                     if (c >= 128) {
 147                         strcat(buffer, "m-");
 148                         c -= 128;
 149                     }
 150                     if (c < 32) {
 151                         strcat(buffer, "c-");
 152                         c += '@';
 153                     }
 154                     printf("%s%c", buffer, c);
 155                     break;
 156             }
 157             break;
 158
 159         case UNBOUND_MARKER_WIDETAG:
 160             printf("<unbound marker>");
 161             break;
 162
 163         default:
 164             printf("%s", widetag_names[type >> 2]);
 165             break;
 166     }
 167 }
 168
 169 static void print_otherimm(lispobj obj)
 170 {
 171     printf(", %s", widetag_names[widetag_of(obj) >> 2]);
 172
 173     switch (widetag_of(obj)) {
 174         case CHARACTER_WIDETAG:
 175             printf(": ");
 176             brief_otherimm(obj);
 177             break;
 178
 179         case SAP_WIDETAG:
 180         case UNBOUND_MARKER_WIDETAG:
 181             break;
 182
 183         default:
 184             printf(": data=%ld", (long) (obj>>8)&0xffffff);
 185             break;
 186     }
 187 }
 188
 189 static void brief_list(lispobj obj)
 190 {
 191     int space = 0;
 192     int length = 0;
 193
 194     if (!is_valid_lisp_addr((os_vm_address_t)native_pointer(obj)))
 195         printf("(invalid Lisp-level address)");
 196     else if (obj == NIL)
 197         printf("NIL");
 198     else {
 199         putchar('(');
 200         while (lowtag_of(obj) == LIST_POINTER_LOWTAG) {
 201             struct cons *cons = (struct cons *)native_pointer(obj);
 202
 203             if (space)
 204                 putchar(' ');
 205             if (++length >= max_length) {
 206                 printf("...");
 207                 obj = NIL;
 208                 break;
 209             }
 210             print_obj("", cons->car);
 211             obj = cons->cdr;
 212             space = 1;
 213             if (obj == NIL)
 214                 break;
 215         }
 216         if (obj != NIL) {
 217             printf(" . ");
 218             print_obj("", obj);
 219         }
 220         putchar(')');
 221     }
 222 }
 223
 224 #ifdef LISP_FEATURE_X86_64
 225 static void print_unknown(lispobj obj)
 226 {
 227   printf("unknown object: %p", (void *)obj);
 228 }
 229 #endif
 230
 231 static void print_list(lispobj obj)
 232 {
 233     if (!is_valid_lisp_addr((os_vm_address_t)native_pointer(obj))) {
 234         printf("(invalid address)");
 235     } else if (obj == NIL) {
 236         printf(" (NIL)");
 237     } else {
 238         struct cons *cons = (struct cons *)native_pointer(obj);
 239
 240         print_obj("car: ", cons->car);
 241         print_obj("cdr: ", cons->cdr);
 242     }
 243 }
 244
 245 static void brief_struct(lispobj obj)
 246 {
 247     struct instance *instance = (struct instance *)native_pointer(obj);
 248     if (!is_valid_lisp_addr((os_vm_address_t)instance)) {
 249         printf("(invalid address)");
 250     } else {
 251         printf("#<ptr to 0x%08lx instance>",
 252                (unsigned long) instance->slots[0]);
 253     }
 254 }
 255
 256 static void print_struct(lispobj obj)
 257 {
 258     struct instance *instance = (struct instance *)native_pointer(obj);
 259     unsigned int i;
 260     char buffer[16];
 261     if (!is_valid_lisp_addr((os_vm_address_t)instance)) {
 262         printf("(invalid address)");
 263     } else {
 264         print_obj("type: ", ((struct instance *)native_pointer(obj))->slots[0]);
 265         for (i = 1; i < HeaderValue(instance->header); i++) {
 266             sprintf(buffer, "slot %d: ", i);
 267             print_obj(buffer, instance->slots[i]);
 268         }
 269     }
 270 }
 271
 272 static void brief_otherptr(lispobj obj)
 273 {
 274     lispobj *ptr, header;
 275     int type;
 276     struct symbol *symbol;
 277     struct vector *vector;
 278     char *charptr;
 279
 280     ptr = (lispobj *) native_pointer(obj);
 281
 282     if (!is_valid_lisp_addr((os_vm_address_t)obj)) {
 283             printf("(invalid address)");
 284             return;
 285     }
 286
 287     header = *ptr;
 288     type = widetag_of(header);
 289     switch (type) {
 290         case SYMBOL_HEADER_WIDETAG:
 291             symbol = (struct symbol *)ptr;
 292             vector = (struct vector *)native_pointer(symbol->name);
 293             for (charptr = (char *)vector->data; *charptr != '\0'; charptr++) {
 294                 if (*charptr == '"')
 295                     putchar('\\');
 296                 putchar(*charptr);
 297             }
 298             break;
 299
 300         case SIMPLE_BASE_STRING_WIDETAG:
 301             vector = (struct vector *)ptr;
 302             putchar('"');
 303             for (charptr = (char *)vector->data; *charptr != '\0'; charptr++) {
 304                 if (*charptr == '"')
 305                     putchar('\\');
 306                 putchar(*charptr);
 307             }
 308             putchar('"');
 309             break;
 310
 311         default:
 312             printf("#<ptr to ");
 313             brief_otherimm(header);
 314             putchar('>');
 315     }
 316 }
 317
 318 static void print_slots(char **slots, int count, lispobj *ptr)
 319 {
 320     while (count-- > 0) {
 321         if (*slots) {
 322             print_obj(*slots++, *ptr++);
 323         } else {
 324             print_obj("???: ", *ptr++);
 325         }
 326     }
 327 }
 328
 329 /* FIXME: Yikes! This needs to depend on the values in sbcl.h (or
 330  * perhaps be generated automatically by GENESIS as part of
 331  * sbcl.h). */
 332 static char *symbol_slots[] = {"value: ", "hash: ",
 333     "plist: ", "name: ", "package: ",
 334 #ifdef LISP_FEATURE_SB_THREAD
 335     "tls-index: " ,
 336 #endif
 337     NULL};
 338 static char *ratio_slots[] = {"numer: ", "denom: ", NULL};
 339 static char *complex_slots[] = {"real: ", "imag: ", NULL};
 340 static char *code_slots[] = {"words: ", "entry: ", "debug: ", NULL};
 341 static char *fn_slots[] = {
 342     "self: ", "next: ", "name: ", "arglist: ", "type: ", NULL};
 343 static char *closure_slots[] = {"fn: ", NULL};
 344 static char *funcallable_instance_slots[] = {"fn: ", "lexenv: ", "layout: ", NULL};
 345 static char *weak_pointer_slots[] = {"value: ", NULL};
 346 static char *fdefn_slots[] = {"name: ", "function: ", "raw_addr: ", NULL};
 347 static char *value_cell_slots[] = {"value: ", NULL};
 348
 349 static void print_otherptr(lispobj obj)
 350 {
 351     if (!is_valid_lisp_addr((os_vm_address_t)obj)) {
 352         printf("(invalid address)");
 353     } else {
 354 #ifndef LISP_FEATURE_ALPHA
 355         lispobj *ptr;
 356         unsigned long header;
 357         unsigned long length;
 358 #else
 359         u32 *ptr;
 360         u32 header;
 361         u32 length;
 362 #endif
 363         int count, type, index;
 364         char *cptr, buffer[16];
 365
 366         ptr = (lispobj*) native_pointer(obj);
 367         if (ptr == NULL) {
 368                 printf(" (NULL Pointer)");
 369                 return;
 370         }
 371
 372         header = *ptr++;
 373         length = fixnum_value(*ptr);
 374         count = HeaderValue(header);
 375         type = widetag_of(header);
 376
 377         print_obj("header: ", header);
 378         if (!other_immediate_lowtag_p(header)) {
 379             NEWLINE_OR_RETURN;
 380             printf("(invalid header object)");
 381             return;
 382         }
 383
 384         switch (type) {
 385             case BIGNUM_WIDETAG:
 386                 ptr += count;
 387                 NEWLINE_OR_RETURN;
 388                 printf("0x");
 389                 while (count-- > 0)
 390                     printf("%08lx", (unsigned long) *--ptr);
 391                 break;
 392
 393             case RATIO_WIDETAG:
 394                 print_slots(ratio_slots, count, ptr);
 395                 break;
 396
 397             case COMPLEX_WIDETAG:
 398                 print_slots(complex_slots, count, ptr);
 399                 break;
 400
 401             case SYMBOL_HEADER_WIDETAG:
 402                 print_slots(symbol_slots, count, ptr);
 403                 break;
 404
 405 #if N_WORD_BITS == 32
 406             case SINGLE_FLOAT_WIDETAG:
 407                 NEWLINE_OR_RETURN;
 408                 printf("%g", ((struct single_float *)native_pointer(obj))->value);
 409                 break;
 410 #endif
 411             case DOUBLE_FLOAT_WIDETAG:
 412                 NEWLINE_OR_RETURN;
 413                 printf("%g", ((struct double_float *)native_pointer(obj))->value);
 414                 break;
 415
 416 #ifdef LONG_FLOAT_WIDETAG
 417             case LONG_FLOAT_WIDETAG:
 418                 NEWLINE_OR_RETURN;
 419                 printf("%Lg", ((struct long_float *)native_pointer(obj))->value);
 420                 break;
 421 #endif
 422
 423 #ifdef COMPLEX_SINGLE_FLOAT_WIDETAG
 424             case COMPLEX_SINGLE_FLOAT_WIDETAG:
 425                 NEWLINE_OR_RETURN;
 426 #ifdef LISP_FEATURE_X86_64
 427                 printf("%g", ((struct complex_single_float *)native_pointer(obj))->data.data[0]);
 428 #else
 429                 printf("%g", ((struct complex_single_float *)native_pointer(obj))->real);
 430 #endif
 431                 NEWLINE_OR_RETURN;
 432 #ifdef LISP_FEATURE_X86_64
 433                 printf("%g", ((struct complex_single_float *)native_pointer(obj))->data.data[1]);
 434 #else
 435                 printf("%g", ((struct complex_single_float *)native_pointer(obj))->imag);
 436 #endif
 437                 break;
 438 #endif
 439
 440 #ifdef COMPLEX_DOUBLE_FLOAT_WIDETAG
 441             case COMPLEX_DOUBLE_FLOAT_WIDETAG:
 442                 NEWLINE_OR_RETURN;
 443                 printf("%g", ((struct complex_double_float *)native_pointer(obj))->real);
 444                 NEWLINE_OR_RETURN;
 445                 printf("%g", ((struct complex_double_float *)native_pointer(obj))->imag);
 446                 break;
 447 #endif
 448
 449 #ifdef COMPLEX_LONG_FLOAT_WIDETAG
 450             case COMPLEX_LONG_FLOAT_WIDETAG:
 451                 NEWLINE_OR_RETURN;
 452                 printf("%Lg", ((struct complex_long_float *)native_pointer(obj))->real);
 453                 NEWLINE_OR_RETURN;
 454                 printf("%Lg", ((struct complex_long_float *)native_pointer(obj))->imag);
 455                 break;
 456 #endif
 457
 458             case SIMPLE_BASE_STRING_WIDETAG:
 459 #ifdef SIMPLE_CHARACTER_STRING_WIDETAG
 460         case SIMPLE_CHARACTER_STRING_WIDETAG: /* FIXME */
 461 #endif
 462                 NEWLINE_OR_RETURN;
 463                 cptr = (char *)(ptr+1);
 464                 putchar('"');
 465                 while (length-- > 0)
 466                     putchar(*cptr++);
 467                 putchar('"');
 468                 break;
 469
 470             case SIMPLE_VECTOR_WIDETAG:
 471                 NEWLINE_OR_RETURN;
 472                 printf("length = %ld", length);
 473                 ptr++;
 474                 index = 0;
 475                 while (length-- > 0) {
 476                     sprintf(buffer, "%d: ", index++);
 477                     print_obj(buffer, *ptr++);
 478                 }
 479                 break;
 480
 481             case INSTANCE_HEADER_WIDETAG:
 482                 NEWLINE_OR_RETURN;
 483                 printf("length = %ld", (long) count);
 484                 index = 0;
 485                 while (count-- > 0) {
 486                     sprintf(buffer, "%d: ", index++);
 487                     print_obj(buffer, *ptr++);
 488                 }
 489                 break;
 490
 491             case SIMPLE_ARRAY_WIDETAG:
 492             case SIMPLE_BIT_VECTOR_WIDETAG:
 493             case SIMPLE_ARRAY_UNSIGNED_BYTE_2_WIDETAG:
 494             case SIMPLE_ARRAY_UNSIGNED_BYTE_4_WIDETAG:
 495             case SIMPLE_ARRAY_UNSIGNED_BYTE_7_WIDETAG:
 496             case SIMPLE_ARRAY_UNSIGNED_BYTE_8_WIDETAG:
 497             case SIMPLE_ARRAY_UNSIGNED_BYTE_15_WIDETAG:
 498             case SIMPLE_ARRAY_UNSIGNED_BYTE_16_WIDETAG:
 499
 500             case SIMPLE_ARRAY_UNSIGNED_FIXNUM_WIDETAG:
 501
 502             case SIMPLE_ARRAY_UNSIGNED_BYTE_31_WIDETAG:
 503             case SIMPLE_ARRAY_UNSIGNED_BYTE_32_WIDETAG:
 504 #ifdef SIMPLE_ARRAY_UNSIGNED_BYTE_63_WIDETAG
 505             case SIMPLE_ARRAY_UNSIGNED_BYTE_63_WIDETAG:
 506 #endif
 507 #ifdef SIMPLE_ARRAY_UNSIGNED_BYTE_64_WIDETAG
 508             case SIMPLE_ARRAY_UNSIGNED_BYTE_64_WIDETAG:
 509 #endif
 510 #ifdef SIMPLE_ARRAY_SIGNED_BYTE_8_WIDETAG
 511             case SIMPLE_ARRAY_SIGNED_BYTE_8_WIDETAG:
 512 #endif
 513 #ifdef SIMPLE_ARRAY_SIGNED_BYTE_16_WIDETAG
 514             case SIMPLE_ARRAY_SIGNED_BYTE_16_WIDETAG:
 515 #endif
 516
 517             case SIMPLE_ARRAY_FIXNUM_WIDETAG:
 518
 519 #ifdef SIMPLE_ARRAY_SIGNED_BYTE_32_WIDETAG
 520             case SIMPLE_ARRAY_SIGNED_BYTE_32_WIDETAG:
 521 #endif
 522 #ifdef SIMPLE_ARRAY_SIGNED_BYTE_64_WIDETAG
 523             case SIMPLE_ARRAY_SIGNED_BYTE_64_WIDETAG:
 524 #endif
 525             case SIMPLE_ARRAY_SINGLE_FLOAT_WIDETAG:
 526             case SIMPLE_ARRAY_DOUBLE_FLOAT_WIDETAG:
 527 #ifdef SIMPLE_ARRAY_LONG_FLOAT_WIDETAG
 528             case SIMPLE_ARRAY_LONG_FLOAT_WIDETAG:
 529 #endif
 530 #ifdef SIMPLE_ARRAY_COMPLEX_SINGLE_FLOAT_WIDETAG
 531             case SIMPLE_ARRAY_COMPLEX_SINGLE_FLOAT_WIDETAG:
 532 #endif
 533 #ifdef SIMPLE_ARRAY_COMPLEX_DOUBLE_FLOAT_WIDETAG
 534             case SIMPLE_ARRAY_COMPLEX_DOUBLE_FLOAT_WIDETAG:
 535 #endif
 536 #ifdef SIMPLE_ARRAY_COMPLEX_LONG_FLOAT_WIDETAG
 537             case SIMPLE_ARRAY_COMPLEX_LONG_FLOAT_WIDETAG:
 538 #endif
 539             case COMPLEX_BASE_STRING_WIDETAG:
 540 #ifdef COMPLEX_CHARACTER_STRING_WIDETAG
 541         case COMPLEX_CHARACTER_STRING_WIDETAG:
 542 #endif
 543             case COMPLEX_VECTOR_NIL_WIDETAG:
 544             case COMPLEX_BIT_VECTOR_WIDETAG:
 545             case COMPLEX_VECTOR_WIDETAG:
 546             case COMPLEX_ARRAY_WIDETAG:
 547                 break;
 548
 549             case CODE_HEADER_WIDETAG:
 550                 print_slots(code_slots, count-1, ptr);
 551                 break;
 552
 553             case SIMPLE_FUN_HEADER_WIDETAG:
 554                 print_slots(fn_slots, 5, ptr);
 555                 break;
 556
 557             case RETURN_PC_HEADER_WIDETAG:
 558                 print_obj("code: ", obj - (count * 4));
 559                 break;
 560
 561             case CLOSURE_HEADER_WIDETAG:
 562                 print_slots(closure_slots, count, ptr);
 563                 break;
 564
 565             case FUNCALLABLE_INSTANCE_HEADER_WIDETAG:
 566                 print_slots(funcallable_instance_slots, count, ptr);
 567                 break;
 568
 569             case VALUE_CELL_HEADER_WIDETAG:
 570                 print_slots(value_cell_slots, 1, ptr);
 571                 break;
 572
 573             case SAP_WIDETAG:
 574                 NEWLINE_OR_RETURN;
 575 #ifndef LISP_FEATURE_ALPHA
 576                 printf("0x%08lx", (unsigned long) *ptr);
 577 #else
 578                 printf("0x%016lx", *(lispobj*)(ptr+1));
 579 #endif
 580                 break;
 581
 582             case WEAK_POINTER_WIDETAG:
 583                 print_slots(weak_pointer_slots, 1, ptr);
 584                 break;
 585
 586             case CHARACTER_WIDETAG:
 587             case UNBOUND_MARKER_WIDETAG:
 588                 NEWLINE_OR_RETURN;
 589                 printf("pointer to an immediate?");
 590                 break;
 591
 592             case FDEFN_WIDETAG:
 593                 print_slots(fdefn_slots, count, ptr);
 594                 break;
 595
 596             default:
 597                 NEWLINE_OR_RETURN;
 598                 printf("Unknown header object?");
 599                 break;
 600         }
 601     }
 602 }
 603
 604 static void print_obj(char *prefix, lispobj obj)
 605 {
 606 #ifdef LISP_FEATURE_X86_64
 607     static void (*verbose_fns[])(lispobj obj)
 608         = {print_fixnum, print_struct, print_otherimm, print_unknown,
 609            print_unknown, print_unknown, print_otherimm, print_list,
 610            print_fixnum, print_otherptr, print_otherimm, print_unknown,
 611            print_unknown, print_unknown, print_otherimm, print_otherptr};
 612     static void (*brief_fns[])(lispobj obj)
 613         = {brief_fixnum, brief_struct, brief_otherimm, print_unknown,
 614            print_unknown,  print_unknown, brief_otherimm, brief_list,
 615            brief_fixnum, brief_otherptr, brief_otherimm, print_unknown,
 616            print_unknown,  print_unknown,brief_otherimm, brief_otherptr};
 617 #else
 618     static void (*verbose_fns[])(lispobj obj)
 619         = {print_fixnum, print_struct, print_otherimm, print_list,
 620            print_fixnum, print_otherptr, print_otherimm, print_otherptr};
 621     static void (*brief_fns[])(lispobj obj)
 622         = {brief_fixnum, brief_struct, brief_otherimm, brief_list,
 623            brief_fixnum, brief_otherptr, brief_otherimm, brief_otherptr};
 624 #endif
 625     int type = lowtag_of(obj);
 626     struct var *var = lookup_by_obj(obj);
 627     char buffer[256];
 628     boolean verbose = cur_depth < brief_depth;
 629
 630     if (!continue_p(verbose))
 631         return;
 632
 633     if (var != NULL && var_clock(var) == cur_clock)
 634         dont_descend = 1;
 635
 636     if (var == NULL && is_lisp_pointer(obj))
 637         var = define_var(NULL, obj, 0);
 638
 639     if (var != NULL)
 640         var_setclock(var, cur_clock);
 641
 642     cur_depth++;
 643     if (verbose) {
 644         if (var != NULL) {
 645             sprintf(buffer, "$%s=", var_name(var));
 646             newline(buffer);
 647         }
 648         else
 649             newline(NULL);
 650         printf("%s0x%08lx: ", prefix, (unsigned long) obj);
 651         if (cur_depth < brief_depth) {
 652             fputs(lowtag_names[type], stdout);
 653             (*verbose_fns[type])(obj);
 654         }
 655         else
 656             (*brief_fns[type])(obj);
 657     }
 658     else {
 659         if (dont_descend)
 660             printf("$%s", var_name(var));
 661         else {
 662             if (var != NULL)
 663                 printf("$%s=", var_name(var));
 664             (*brief_fns[type])(obj);
 665         }
 666     }
 667     cur_depth--;
 668     dont_descend = 0;
 669 }
 670
 671 void reset_printer()
 672 {
 673     cur_clock++;
 674     cur_lines = 0;
 675     dont_descend = 0;
 676 }
 677
 678 void print(lispobj obj)
 679 {
 680     skip_newline = 1;
 681     cur_depth = 0;
 682     max_depth = 5;
 683     max_lines = 20;
 684
 685     print_obj("", obj);
 686
 687     putchar('\n');
 688 }
 689
 690 void brief_print(lispobj obj)
 691 {
 692     skip_newline = 1;
 693     cur_depth = 0;
 694     max_depth = 1;
 695     max_lines = 5000;
 696
 697     print_obj("", obj);
 698     putchar('\n');
 699 }
 700
 701 #else
 702
 703 void
 704 brief_print(lispobj obj)
 705 {
 706     printf("lispobj 0x%lx\n", (unsigned long)obj);
 707 }
 708
 709 #endif /* defined(LISP_FEATURE_SB_LDB) */