load.c

   1 /*
   2  * load methods from eval.c
   3  */
   4
   5 #include "eval_intern.h"
   6
   7 VALUE ruby_dln_librefs;
   8
   9 #define IS_RBEXT(e) (strcmp(e, ".rb") == 0)
  10 #define IS_SOEXT(e) (strcmp(e, ".so") == 0 || strcmp(e, ".o") == 0)
  11 #ifdef DLEXT2
  12 #define IS_DLEXT(e) (strcmp(e, DLEXT) == 0 || strcmp(e, DLEXT2) == 0)
  13 #else
  14 #define IS_DLEXT(e) (strcmp(e, DLEXT) == 0)
  15 #endif
  16
  17
  18 static const char *const loadable_ext[] = {
  19     ".rb", DLEXT,
  20 #ifdef DLEXT2
  21     DLEXT2,
  22 #endif
  23     0
  24 };
  25
  26 VALUE
  27 rb_get_load_path(void)
  28 {
  29     VALUE load_path = GET_VM()->load_path;
  30     VALUE ary = rb_ary_new2(RARRAY_LEN(load_path));
  31     long i;
  32
  33     for (i = 0; i < RARRAY_LEN(load_path); ++i) {
  34         rb_ary_push(ary, rb_file_expand_path(RARRAY_PTR(load_path)[i], Qnil));
  35     }
  36     return ary;
  37 }
  38
  39 static VALUE
  40 load_path_getter(ID id, rb_vm_t *vm)
  41 {
  42     return vm->load_path;
  43 }
  44
  45 static VALUE
  46 get_loaded_features(void)
  47 {
  48     return GET_VM()->loaded_features;
  49 }
  50
  51 static st_table *
  52 get_loading_table(void)
  53 {
  54     return GET_VM()->loading_table;
  55 }
  56
  57 static VALUE
  58 loaded_feature_path(const char *name, long vlen, const char *feature, long len,
  59                     int type, VALUE load_path)
  60 {
  61     long i;
  62
  63     for (i = 0; i < RARRAY_LEN(load_path); ++i) {
  64         VALUE p = RARRAY_PTR(load_path)[i];
  65         const char *s = StringValuePtr(p);
  66         long n = RSTRING_LEN(p);
  67
  68         if (vlen < n + len + 1) continue;
  69         if (n && (strncmp(name, s, n) || name[n] != '/')) continue;
  70         if (strncmp(name + n + 1, feature, len)) continue;
  71         if (name[n+len+1] && name[n+len+1] != '.') continue;
  72         switch (type) {
  73           case 's':
  74             if (IS_DLEXT(&name[n+len+1])) return p;
  75             break;
  76           case 'r':
  77             if (IS_RBEXT(&name[n+len+1])) return p;
  78             break;
  79           default:
  80             return p;
  81         }
  82     }
  83     return 0;
  84 }
  85
  86 struct loaded_feature_searching {
  87     const char *name;
  88     long len;
  89     int type;
  90     VALUE load_path;
  91     const char *result;
  92 };
  93
  94 static int
  95 loaded_feature_path_i(st_data_t v, st_data_t b, st_data_t f)
  96 {
  97     const char *s = (const char *)v;
  98     struct loaded_feature_searching *fp = (struct loaded_feature_searching *)f;
  99     VALUE p = loaded_feature_path(s, strlen(s), fp->name, fp->len,
 100                                   fp->type, fp->load_path);
 101     if (!p) return ST_CONTINUE;
 102     fp->result = s;
 103     return ST_STOP;
 104 }
 105
 106 static int
 107 rb_feature_p(const char *feature, const char *ext, int rb, int expanded, const char **fn)
 108 {
 109     VALUE v, features, p, load_path = 0;
 110     const char *f, *e;
 111     long i, len, elen, n;
 112     st_table *loading_tbl;
 113     st_data_t data;
 114     int type;
 115
 116     if (fn) *fn = 0;
 117     if (ext) {
 118         len = ext - feature;
 119         elen = strlen(ext);
 120         type = rb ? 'r' : 's';
 121     }
 122     else {
 123         len = strlen(feature);
 124         elen = 0;
 125         type = 0;
 126     }
 127     features = get_loaded_features();
 128     for (i = 0; i < RARRAY_LEN(features); ++i) {
 129         v = RARRAY_PTR(features)[i];
 130         f = StringValuePtr(v);
 131         if ((n = RSTRING_LEN(v)) < len) continue;
 132         if (strncmp(f, feature, len) != 0) {
 133             if (expanded) continue;
 134             if (!load_path) load_path = rb_get_load_path();
 135             if (!(p = loaded_feature_path(f, n, feature, len, type, load_path)))
 136                 continue;
 137             f += RSTRING_LEN(p) + 1;
 138         }
 139         if (!*(e = f + len)) {
 140             if (ext) continue;
 141             return 'u';
 142         }
 143         if (*e != '.') continue;
 144         if ((!rb || !ext) && (IS_SOEXT(e) || IS_DLEXT(e))) {
 145             return 's';
 146         }
 147         if ((rb || !ext) && (IS_RBEXT(e))) {
 148             return 'r';
 149         }
 150     }
 151     loading_tbl = get_loading_table();
 152     if (loading_tbl) {
 153         f = 0;
 154         if (!expanded) {
 155             struct loaded_feature_searching fs;
 156             fs.name = feature;
 157             fs.len = len;
 158             fs.type = type;
 159             fs.load_path = load_path ? load_path : rb_get_load_path();
 160             fs.result = 0;
 161             st_foreach(loading_tbl, loaded_feature_path_i, (st_data_t)&fs);
 162             if ((f = fs.result) != 0) {
 163                 if (fn) *fn = f;
 164                 goto loading;
 165             }
 166         }
 167         if (st_get_key(loading_tbl, (st_data_t)feature, &data)) {
 168             if (fn) *fn = (const char*)data;
 169           loading:
 170             if (!ext) return 'u';
 171             return !IS_RBEXT(ext) ? 's' : 'r';
 172         }
 173         else {
 174             VALUE bufstr;
 175             char *buf;
 176
 177             if (ext && *ext) return 0;
 178             bufstr = rb_str_tmp_new(len + DLEXT_MAXLEN);
 179             buf = RSTRING_PTR(bufstr);
 180             MEMCPY(buf, feature, char, len);
 181             for (i = 0; (e = loadable_ext[i]) != 0; i++) {
 182                 strncpy(buf + len, e, DLEXT_MAXLEN + 1);
 183                 if (st_get_key(loading_tbl, (st_data_t)buf, &data)) {
 184                     rb_str_resize(bufstr, 0);
 185                     if (fn) *fn = (const char*)data;
 186                     return i ? 's' : 'r';
 187                 }
 188             }
 189             rb_str_resize(bufstr, 0);
 190         }
 191     }
 192     return 0;
 193 }
 194
 195 int
 196 rb_provided(const char *feature)
 197 {
 198     const char *ext = strrchr(feature, '.');
 199     volatile VALUE fullpath = 0;
 200
 201     if (*feature == '.' &&
 202         (feature[1] == '/' || strncmp(feature+1, "./", 2) == 0)) {
 203         fullpath = rb_file_expand_path(rb_str_new2(feature), Qnil);
 204         feature = RSTRING_PTR(fullpath);
 205     }
 206     if (ext && !strchr(ext, '/')) {
 207         if (IS_RBEXT(ext)) {
 208             if (rb_feature_p(feature, ext, Qtrue, Qfalse, 0)) return Qtrue;
 209             return Qfalse;
 210         }
 211         else if (IS_SOEXT(ext) || IS_DLEXT(ext)) {
 212             if (rb_feature_p(feature, ext, Qfalse, Qfalse, 0)) return Qtrue;
 213             return Qfalse;
 214         }
 215     }
 216     if (rb_feature_p(feature, feature + strlen(feature), Qtrue, Qfalse, 0))
 217         return Qtrue;
 218     return Qfalse;
 219 }
 220
 221 static void
 222 rb_provide_feature(VALUE feature)
 223 {
 224     rb_ary_push(get_loaded_features(), feature);
 225 }
 226
 227 void
 228 rb_provide(const char *feature)
 229 {
 230     rb_provide_feature(rb_str_new2(feature));
 231 }
 232
 233 NORETURN(static void load_failed(VALUE));
 234
 235 void
 236 rb_load(VALUE fname, int wrap)
 237 {
 238     VALUE tmp;
 239     int state;
 240     rb_thread_t *th = GET_THREAD();
 241     volatile VALUE wrapper = th->top_wrapper;
 242     volatile VALUE self = th->top_self;
 243     volatile int loaded = Qfalse;
 244     volatile int mild_compile_error;
 245 #ifndef __GNUC__
 246     rb_thread_t *volatile th0 = th;
 247 #endif
 248
 249     FilePathValue(fname);
 250     fname = rb_str_new4(fname);
 251     tmp = rb_find_file(fname);
 252     if (!tmp) {
 253         load_failed(fname);
 254     }
 255     RB_GC_GUARD(fname) = rb_str_new4(tmp);
 256
 257     th->errinfo = Qnil; /* ensure */
 258
 259     if (!wrap) {
 260         rb_secure(4);           /* should alter global state */
 261         th->top_wrapper = 0;
 262     }
 263     else {
 264         /* load in anonymous module as toplevel */
 265         th->top_self = rb_obj_clone(rb_vm_top_self());
 266         th->top_wrapper = rb_module_new();
 267         rb_extend_object(th->top_self, th->top_wrapper);
 268     }
 269
 270     mild_compile_error = th->mild_compile_error;
 271     PUSH_TAG();
 272     state = EXEC_TAG();
 273     if (state == 0) {
 274         NODE *node;
 275         VALUE iseq;
 276
 277         th->mild_compile_error++;
 278         node = (NODE *)rb_load_file(RSTRING_PTR(fname));
 279         loaded = Qtrue;
 280         iseq = rb_iseq_new(node, rb_str_new2("<top (required)>"),
 281                            fname, Qfalse, ISEQ_TYPE_TOP);
 282         th->mild_compile_error--;
 283         rb_iseq_eval(iseq);
 284     }
 285     POP_TAG();
 286
 287 #ifndef __GNUC__
 288     th = th0;
 289     fname = RB_GC_GUARD(fname);
 290 #endif
 291     th->mild_compile_error = mild_compile_error;
 292     th->top_self = self;
 293     th->top_wrapper = wrapper;
 294
 295     if (!loaded) {
 296         rb_exc_raise(GET_THREAD()->errinfo);
 297     }
 298     if (state) {
 299         vm_jump_tag_but_local_jump(state, Qundef);
 300     }
 301
 302     if (!NIL_P(GET_THREAD()->errinfo)) {
 303         /* exception during load */
 304         rb_exc_raise(th->errinfo);
 305     }
 306 }
 307
 308 void
 309 rb_load_protect(VALUE fname, int wrap, int *state)
 310 {
 311     int status;
 312
 313     PUSH_TAG();
 314     if ((status = EXEC_TAG()) == 0) {
 315         rb_load(fname, wrap);
 316     }
 317     POP_TAG();
 318     if (state)
 319         *state = status;
 320 }
 321
 322 /*
 323  *  call-seq:
 324  *     load(filename, wrap=false)   => true
 325  *
 326  *  Loads and executes the Ruby
 327  *  program in the file _filename_. If the filename does not
 328  *  resolve to an absolute path, the file is searched for in the library
 329  *  directories listed in <code>$:</code>. If the optional _wrap_
 330  *  parameter is +true+, the loaded script will be executed
 331  *  under an anonymous module, protecting the calling program's global
 332  *  namespace. In no circumstance will any local variables in the loaded
 333  *  file be propagated to the loading environment.
 334  */
 335
 336 static VALUE
 337 rb_f_load(int argc, VALUE *argv)
 338 {
 339     VALUE fname, wrap;
 340
 341     rb_scan_args(argc, argv, "11", &fname, &wrap);
 342     rb_load(fname, RTEST(wrap));
 343     return Qtrue;
 344 }
 345
 346 static char *
 347 load_lock(const char *ftptr)
 348 {
 349     st_data_t data;
 350     st_table *loading_tbl = get_loading_table();
 351
 352     if (!loading_tbl || !st_lookup(loading_tbl, (st_data_t)ftptr, &data)) {
 353         /* loading ruby library should be serialized. */
 354         if (!loading_tbl) {
 355             GET_VM()->loading_table = loading_tbl = st_init_strtable();
 356         }
 357         /* partial state */
 358         ftptr = ruby_strdup(ftptr);
 359         data = (st_data_t)rb_barrier_new();
 360         st_insert(loading_tbl, (st_data_t)ftptr, data);
 361         return (char *)ftptr;
 362     }
 363     return RTEST(rb_barrier_wait((VALUE)data)) ? (char *)ftptr : 0;
 364 }
 365
 366 static void
 367 load_unlock(const char *ftptr)
 368 {
 369     if (ftptr) {
 370         st_data_t key = (st_data_t)ftptr;
 371         st_data_t data;
 372         st_table *loading_tbl = get_loading_table();
 373
 374         if (st_delete(loading_tbl, &key, &data)) {
 375             xfree((char *)key);
 376             rb_barrier_release((VALUE)data);
 377         }
 378     }
 379 }
 380
 381
 382 /*
 383  *  call-seq:
 384  *     require(string)    => true or false
 385  *
 386  *  Ruby tries to load the library named _string_, returning
 387  *  +true+ if successful. If the filename does not resolve to
 388  *  an absolute path, it will be searched for in the directories listed
 389  *  in <code>$:</code>. If the file has the extension ``.rb'', it is
 390  *  loaded as a source file; if the extension is ``.so'', ``.o'', or
 391  *  ``.dll'', or whatever the default shared library extension is on
 392  *  the current platform, Ruby loads the shared library as a Ruby
 393  *  extension. Otherwise, Ruby tries adding ``.rb'', ``.so'', and so on
 394  *  to the name. The name of the loaded feature is added to the array in
 395  *  <code>$"</code>. A feature will not be loaded if it's name already
 396  *  appears in <code>$"</code>. However, the file name is not converted
 397  *  to an absolute path, so that ``<code>require 'a';require
 398  *  './a'</code>'' will load <code>a.rb</code> twice.
 399  *
 400  *     require "my-library.rb"
 401  *     require "db-driver"
 402  */
 403
 404 VALUE
 405 rb_f_require(VALUE obj, VALUE fname)
 406 {
 407     return rb_require_safe(fname, rb_safe_level());
 408 }
 409
 410 static int
 411 search_required(VALUE fname, volatile VALUE *path)
 412 {
 413     VALUE tmp;
 414     char *ext, *ftptr;
 415     int type, ft = 0;
 416     const char *loading;
 417
 418     *path = 0;
 419     ext = strrchr(ftptr = RSTRING_PTR(fname), '.');
 420     if (ext && !strchr(ext, '/')) {
 421         if (IS_RBEXT(ext)) {
 422             if (rb_feature_p(ftptr, ext, Qtrue, Qfalse, &loading)) {
 423                 if (loading) *path = rb_str_new2(loading);
 424                 return 'r';
 425             }
 426             if ((tmp = rb_find_file(fname)) != 0) {
 427                 tmp = rb_file_expand_path(tmp, Qnil);
 428                 ext = strrchr(ftptr = RSTRING_PTR(tmp), '.');
 429                 if (!rb_feature_p(ftptr, ext, Qtrue, Qtrue, 0))
 430                     *path = tmp;
 431                 return 'r';
 432             }
 433             return 0;
 434         }
 435         else if (IS_SOEXT(ext)) {
 436             if (rb_feature_p(ftptr, ext, Qfalse, Qfalse, &loading)) {
 437                 if (loading) *path = rb_str_new2(loading);
 438                 return 's';
 439             }
 440             tmp = rb_str_new(RSTRING_PTR(fname), ext - RSTRING_PTR(fname));
 441 #ifdef DLEXT2
 442             OBJ_FREEZE(tmp);
 443             if (rb_find_file_ext(&tmp, loadable_ext + 1)) {
 444                 tmp = rb_file_expand_path(tmp, Qnil);
 445                 ext = strrchr(ftptr = RSTRING_PTR(tmp), '.');
 446                 if (!rb_feature_p(ftptr, ext, Qfalse, Qtrue, 0))
 447                     *path = tmp;
 448                 return 's';
 449             }
 450 #else
 451             rb_str_cat2(tmp, DLEXT);
 452             OBJ_FREEZE(tmp);
 453             if ((tmp = rb_find_file(tmp)) != 0) {
 454                 tmp = rb_file_expand_path(tmp, Qnil);
 455                 ext = strrchr(ftptr = RSTRING_PTR(tmp), '.');
 456                 if (!rb_feature_p(ftptr, ext, Qfalse, Qtrue, 0))
 457                     *path = tmp;
 458                 return 's';
 459             }
 460 #endif
 461         }
 462         else if (IS_DLEXT(ext)) {
 463             if (rb_feature_p(ftptr, ext, Qfalse, Qfalse, &loading)) {
 464                 if (loading) *path = rb_str_new2(loading);
 465                 return 's';
 466             }
 467             if ((tmp = rb_find_file(fname)) != 0) {
 468                 tmp = rb_file_expand_path(tmp, Qnil);
 469                 ext = strrchr(ftptr = RSTRING_PTR(tmp), '.');
 470                 if (!rb_feature_p(ftptr, ext, Qfalse, Qtrue, 0))
 471                     *path = tmp;
 472                 return 's';
 473             }
 474         }
 475     }
 476     else if ((ft = rb_feature_p(ftptr, 0, Qfalse, Qfalse, &loading)) == 'r') {
 477         if (loading) *path = rb_str_new2(loading);
 478         return 'r';
 479     }
 480     tmp = fname;
 481     type = rb_find_file_ext(&tmp, loadable_ext);
 482     tmp = rb_file_expand_path(tmp, Qnil);
 483     switch (type) {
 484       case 0:
 485         if (ft)
 486             break;
 487         ftptr = RSTRING_PTR(tmp);
 488         return rb_feature_p(ftptr, 0, Qfalse, Qtrue, 0);
 489
 490       default:
 491         if (ft)
 492             break;
 493       case 1:
 494         ext = strrchr(ftptr = RSTRING_PTR(tmp), '.');
 495         if (rb_feature_p(ftptr, ext, !--type, Qtrue, &loading) && !loading)
 496             break;
 497         *path = tmp;
 498     }
 499     return type ? 's' : 'r';
 500 }
 501
 502 static void
 503 load_failed(VALUE fname)
 504 {
 505     rb_raise(rb_eLoadError, "no such file to load -- %s",
 506              RSTRING_PTR(fname));
 507 }
 508
 509 static VALUE
 510 load_ext(VALUE path)
 511 {
 512     SCOPE_SET(NOEX_PUBLIC);
 513     return (VALUE)dln_load(RSTRING_PTR(path));
 514 }
 515
 516 VALUE
 517 rb_require_safe(VALUE fname, int safe)
 518 {
 519     VALUE result = Qnil;
 520     rb_thread_t *th = GET_THREAD();
 521     volatile VALUE errinfo = th->errinfo;
 522     int state;
 523     struct {
 524         int safe;
 525     } volatile saved;
 526     char *volatile ftptr = 0;
 527
 528     PUSH_TAG();
 529     saved.safe = rb_safe_level();
 530     if ((state = EXEC_TAG()) == 0) {
 531         VALUE path;
 532         long handle;
 533         int found;
 534
 535         rb_set_safe_level_force(safe);
 536         FilePathValue(fname);
 537         RB_GC_GUARD(fname) = rb_str_new4(fname);
 538         found = search_required(fname, &path);
 539         if (found) {
 540             if (!path || !(ftptr = load_lock(RSTRING_PTR(path)))) {
 541                 result = Qfalse;
 542             }
 543             else {
 544                 rb_set_safe_level_force(0);
 545                 switch (found) {
 546                   case 'r':
 547                     rb_load(path, 0);
 548                     break;
 549
 550                   case 's':
 551                     handle = (long)rb_vm_call_cfunc(rb_vm_top_self(), load_ext,
 552                                                     path, 0, path);
 553                     rb_ary_push(ruby_dln_librefs, LONG2NUM(handle));
 554                     break;
 555                 }
 556                 rb_provide_feature(path);
 557                 result = Qtrue;
 558             }
 559         }
 560     }
 561     POP_TAG();
 562     load_unlock(ftptr);
 563
 564     rb_set_safe_level_force(saved.safe);
 565     if (state) {
 566         JUMP_TAG(state);
 567     }
 568
 569     if (NIL_P(result)) {
 570         load_failed(fname);
 571     }
 572
 573     th->errinfo = errinfo;
 574
 575     return result;
 576 }
 577
 578 VALUE
 579 rb_require(const char *fname)
 580 {
 581     VALUE fn = rb_str_new2(fname);
 582     OBJ_FREEZE(fn);
 583     return rb_require_safe(fn, rb_safe_level());
 584 }
 585
 586 static VALUE
 587 init_ext_call(VALUE arg)
 588 {
 589     SCOPE_SET(NOEX_PUBLIC);
 590     (*(void (*)(void))arg)();
 591     return Qnil;
 592 }
 593
 594 void
 595 ruby_init_ext(const char *name, void (*init)(void))
 596 {
 597     if (load_lock(name)) {
 598         rb_vm_call_cfunc(rb_vm_top_self(), init_ext_call, (VALUE)init,
 599                          0, rb_str_new2(name));
 600         rb_provide(name);
 601         load_unlock(name);
 602     }
 603 }
 604
 605 /*
 606  *  call-seq:
 607  *     mod.autoload(name, filename)   => nil
 608  *
 609  *  Registers _filename_ to be loaded (using <code>Kernel::require</code>)
 610  *  the first time that _module_ (which may be a <code>String</code> or
 611  *  a symbol) is accessed in the namespace of _mod_.
 612  *
 613  *     module A
 614  *     end
 615  *     A.autoload(:B, "b")
 616  *     A::B.doit            # autoloads "b"
 617  */
 618
 619 static VALUE
 620 rb_mod_autoload(VALUE mod, VALUE sym, VALUE file)
 621 {
 622     ID id = rb_to_id(sym);
 623
 624     Check_SafeStr(file);
 625     rb_autoload(mod, id, RSTRING_PTR(file));
 626     return Qnil;
 627 }
 628
 629 /*
 630  * MISSING: documentation
 631  */
 632
 633 static VALUE
 634 rb_mod_autoload_p(VALUE mod, VALUE sym)
 635 {
 636     return rb_autoload_p(mod, rb_to_id(sym));
 637 }
 638
 639 /*
 640  *  call-seq:
 641  *     autoload(module, filename)   => nil
 642  *
 643  *  Registers _filename_ to be loaded (using <code>Kernel::require</code>)
 644  *  the first time that _module_ (which may be a <code>String</code> or
 645  *  a symbol) is accessed.
 646  *
 647  *     autoload(:MyModule, "/usr/local/lib/modules/my_module.rb")
 648  */
 649
 650 static VALUE
 651 rb_f_autoload(VALUE obj, VALUE sym, VALUE file)
 652 {
 653     VALUE klass = rb_vm_cbase();
 654     if (NIL_P(klass)) {
 655         rb_raise(rb_eTypeError, "Can not set autoload on singleton class");
 656     }
 657     return rb_mod_autoload(klass, sym, file);
 658 }
 659
 660 /*
 661  * MISSING: documentation
 662  */
 663
 664 static VALUE
 665 rb_f_autoload_p(VALUE obj, VALUE sym)
 666 {
 667     /* use rb_vm_cbase() as same as rb_f_autoload. */
 668     VALUE klass = rb_vm_cbase();
 669     if (NIL_P(klass)) {
 670         return Qnil;
 671     }
 672     return rb_mod_autoload_p(klass, sym);
 673 }
 674
 675 void
 676 Init_load()
 677 {
 678 #undef rb_intern
 679 #define rb_intern(str) rb_intern2(str, strlen(str))
 680     rb_vm_t *vm = GET_VM();
 681     static const char var_load_path[] = "$:";
 682     ID id_load_path = rb_intern2(var_load_path, sizeof(var_load_path)-1);
 683
 684     rb_define_hooked_variable(var_load_path, (VALUE*)vm, load_path_getter, 0);
 685     rb_alias_variable(rb_intern("$-I"), id_load_path);
 686     rb_alias_variable(rb_intern("$LOAD_PATH"), id_load_path);
 687     vm->load_path = rb_ary_new();
 688
 689     rb_define_virtual_variable("$\"", get_loaded_features, 0);
 690     rb_define_virtual_variable("$LOADED_FEATURES", get_loaded_features, 0);
 691     vm->loaded_features = rb_ary_new();
 692
 693     rb_define_global_function("load", rb_f_load, -1);
 694     rb_define_global_function("require", rb_f_require, 1);
 695     rb_define_method(rb_cModule, "autoload", rb_mod_autoload, 2);
 696     rb_define_method(rb_cModule, "autoload?", rb_mod_autoload_p, 1);
 697     rb_define_global_function("autoload", rb_f_autoload, 2);
 698     rb_define_global_function("autoload?", rb_f_autoload_p, 1);
 699
 700     ruby_dln_librefs = rb_ary_new();
 701     rb_register_mark_object(ruby_dln_librefs);
 702 }