1 /* BEGIN CSTYLED */ 2 /* 3 ** $Id: lapi.c,v 2.171.1.1 2013/04/12 18:48:47 roberto Exp $ 4 ** Lua API 5 ** See Copyright Notice in lua.h 6 */ 7 8 9 #define lapi_c 10 #define LUA_CORE 11 12 #include <sys/lua/lua.h> 13 14 #include "lapi.h" 15 #include "ldebug.h" 16 #include "ldo.h" 17 #include "lfunc.h" 18 #include "lgc.h" 19 #include "lmem.h" 20 #include "lobject.h" 21 #include "lstate.h" 22 #include "lstring.h" 23 #include "ltable.h" 24 #include "ltm.h" 25 #include "lvm.h" 26 27 28 29 const char lua_ident[] = 30 "$LuaVersion: " LUA_COPYRIGHT " $" 31 "$LuaAuthors: " LUA_AUTHORS " $"; 32 33 34 /* value at a non-valid index */ 35 #define NONVALIDVALUE cast(TValue *, luaO_nilobject) 36 37 /* corresponding test */ 38 #define isvalid(o) ((o) != luaO_nilobject) 39 40 /* test for pseudo index */ 41 #define ispseudo(i) ((i) <= LUA_REGISTRYINDEX) 42 43 /* test for valid but not pseudo index */ 44 #define isstackindex(i, o) (isvalid(o) && !ispseudo(i)) 45 46 #define api_checkvalidindex(L, o) api_check(L, isvalid(o), "invalid index") 47 48 #define api_checkstackindex(L, i, o) \ 49 api_check(L, isstackindex(i, o), "index not in the stack") 50 51 52 static TValue *index2addr (lua_State *L, int idx) { 53 CallInfo *ci = L->ci; 54 if (idx > 0) { 55 TValue *o = ci->func + idx; 56 api_check(L, idx <= ci->top - (ci->func + 1), "unacceptable index"); 57 if (o >= L->top) return NONVALIDVALUE; 58 else return o; 59 } 60 else if (!ispseudo(idx)) { /* negative index */ 61 api_check(L, idx != 0 && -idx <= L->top - (ci->func + 1), "invalid index"); 62 return L->top + idx; 63 } 64 else if (idx == LUA_REGISTRYINDEX) 65 return &G(L)->l_registry; 66 else { /* upvalues */ 67 idx = LUA_REGISTRYINDEX - idx; 68 api_check(L, idx <= MAXUPVAL + 1, "upvalue index too large"); 69 if (ttislcf(ci->func)) /* light C function? */ 70 return NONVALIDVALUE; /* it has no upvalues */ 71 else { 72 CClosure *func = clCvalue(ci->func); 73 return (idx <= func->nupvalues) ? &func->upvalue[idx-1] : NONVALIDVALUE; 74 } 75 } 76 } 77 78 79 /* 80 ** to be called by 'lua_checkstack' in protected mode, to grow stack 81 ** capturing memory errors 82 */ 83 static void growstack (lua_State *L, void *ud) { 84 int size = *(int *)ud; 85 luaD_growstack(L, size); 86 } 87 88 89 LUA_API int lua_checkstack (lua_State *L, int size) { 90 int res; 91 CallInfo *ci = L->ci; 92 lua_lock(L); 93 if (L->stack_last - L->top > size) /* stack large enough? */ 94 res = 1; /* yes; check is OK */ 95 else { /* no; need to grow stack */ 96 int inuse = cast_int(L->top - L->stack) + EXTRA_STACK; 97 if (inuse > LUAI_MAXSTACK - size) /* can grow without overflow? */ 98 res = 0; /* no */ 99 else /* try to grow stack */ 100 res = (luaD_rawrunprotected(L, &growstack, &size) == LUA_OK); 101 } 102 if (res && ci->top < L->top + size) 103 ci->top = L->top + size; /* adjust frame top */ 104 lua_unlock(L); 105 return res; 106 } 107 108 109 LUA_API void lua_xmove (lua_State *from, lua_State *to, int n) { 110 int i; 111 if (from == to) return; 112 lua_lock(to); 113 api_checknelems(from, n); 114 api_check(from, G(from) == G(to), "moving among independent states"); 115 api_check(from, to->ci->top - to->top >= n, "not enough elements to move"); 116 from->top -= n; 117 for (i = 0; i < n; i++) { 118 setobj2s(to, to->top++, from->top + i); 119 } 120 lua_unlock(to); 121 } 122 123 124 LUA_API lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf) { 125 lua_CFunction old; 126 lua_lock(L); 127 old = G(L)->panic; 128 G(L)->panic = panicf; 129 lua_unlock(L); 130 return old; 131 } 132 133 134 LUA_API const lua_Number *lua_version (lua_State *L) { 135 static const lua_Number version = LUA_VERSION_NUM; 136 if (L == NULL) return &version; 137 else return G(L)->version; 138 } 139 140 141 142 /* 143 ** basic stack manipulation 144 */ 145 146 147 /* 148 ** convert an acceptable stack index into an absolute index 149 */ 150 LUA_API int lua_absindex (lua_State *L, int idx) { 151 return (idx > 0 || ispseudo(idx)) 152 ? idx 153 : cast_int(L->top - L->ci->func + idx); 154 } 155 156 157 LUA_API int lua_gettop (lua_State *L) { 158 return cast_int(L->top - (L->ci->func + 1)); 159 } 160 161 162 LUA_API void lua_settop (lua_State *L, int idx) { 163 StkId func = L->ci->func; 164 lua_lock(L); 165 if (idx >= 0) { 166 api_check(L, idx <= L->stack_last - (func + 1), "new top too large"); 167 while (L->top < (func + 1) + idx) 168 setnilvalue(L->top++); 169 L->top = (func + 1) + idx; 170 } 171 else { 172 api_check(L, -(idx+1) <= (L->top - (func + 1)), "invalid new top"); 173 L->top += idx+1; /* `subtract' index (index is negative) */ 174 } 175 lua_unlock(L); 176 } 177 178 179 LUA_API void lua_remove (lua_State *L, int idx) { 180 StkId p; 181 lua_lock(L); 182 p = index2addr(L, idx); 183 api_checkstackindex(L, idx, p); 184 while (++p < L->top) setobjs2s(L, p-1, p); 185 L->top--; 186 lua_unlock(L); 187 } 188 189 190 LUA_API void lua_insert (lua_State *L, int idx) { 191 StkId p; 192 StkId q; 193 lua_lock(L); 194 p = index2addr(L, idx); 195 api_checkstackindex(L, idx, p); 196 for (q = L->top; q > p; q--) /* use L->top as a temporary */ 197 setobjs2s(L, q, q - 1); 198 setobjs2s(L, p, L->top); 199 lua_unlock(L); 200 } 201 202 203 static void moveto (lua_State *L, TValue *fr, int idx) { 204 TValue *to = index2addr(L, idx); 205 api_checkvalidindex(L, to); 206 setobj(L, to, fr); 207 if (idx < LUA_REGISTRYINDEX) /* function upvalue? */ 208 luaC_barrier(L, clCvalue(L->ci->func), fr); 209 /* LUA_REGISTRYINDEX does not need gc barrier 210 (collector revisits it before finishing collection) */ 211 } 212 213 214 LUA_API void lua_replace (lua_State *L, int idx) { 215 lua_lock(L); 216 api_checknelems(L, 1); 217 moveto(L, L->top - 1, idx); 218 L->top--; 219 lua_unlock(L); 220 } 221 222 223 LUA_API void lua_copy (lua_State *L, int fromidx, int toidx) { 224 TValue *fr; 225 lua_lock(L); 226 fr = index2addr(L, fromidx); 227 moveto(L, fr, toidx); 228 lua_unlock(L); 229 } 230 231 232 LUA_API void lua_pushvalue (lua_State *L, int idx) { 233 lua_lock(L); 234 setobj2s(L, L->top, index2addr(L, idx)); 235 api_incr_top(L); 236 lua_unlock(L); 237 } 238 239 240 241 /* 242 ** access functions (stack -> C) 243 */ 244 245 246 LUA_API int lua_type (lua_State *L, int idx) { 247 StkId o = index2addr(L, idx); 248 return (isvalid(o) ? ttypenv(o) : LUA_TNONE); 249 } 250 251 252 LUA_API const char *lua_typename (lua_State *L, int t) { 253 UNUSED(L); 254 return ttypename(t); 255 } 256 257 258 LUA_API int lua_iscfunction (lua_State *L, int idx) { 259 StkId o = index2addr(L, idx); 260 return (ttislcf(o) || (ttisCclosure(o))); 261 } 262 263 264 LUA_API int lua_isnumber (lua_State *L, int idx) { 265 TValue n; 266 const TValue *o = index2addr(L, idx); 267 return tonumber(o, &n); 268 } 269 270 271 LUA_API int lua_isstring (lua_State *L, int idx) { 272 int t = lua_type(L, idx); 273 return (t == LUA_TSTRING || t == LUA_TNUMBER); 274 } 275 276 277 LUA_API int lua_isuserdata (lua_State *L, int idx) { 278 const TValue *o = index2addr(L, idx); 279 return (ttisuserdata(o) || ttislightuserdata(o)); 280 } 281 282 283 LUA_API int lua_rawequal (lua_State *L, int index1, int index2) { 284 StkId o1 = index2addr(L, index1); 285 StkId o2 = index2addr(L, index2); 286 return (isvalid(o1) && isvalid(o2)) ? luaV_rawequalobj(o1, o2) : 0; 287 } 288 289 290 LUA_API void lua_arith (lua_State *L, int op) { 291 StkId o1; /* 1st operand */ 292 StkId o2; /* 2nd operand */ 293 lua_lock(L); 294 if (op != LUA_OPUNM) /* all other operations expect two operands */ 295 api_checknelems(L, 2); 296 else { /* for unary minus, add fake 2nd operand */ 297 api_checknelems(L, 1); 298 setobjs2s(L, L->top, L->top - 1); 299 L->top++; 300 } 301 o1 = L->top - 2; 302 o2 = L->top - 1; 303 if (ttisnumber(o1) && ttisnumber(o2)) { 304 setnvalue(o1, luaO_arith(op, nvalue(o1), nvalue(o2))); 305 } 306 else 307 luaV_arith(L, o1, o1, o2, cast(TMS, op - LUA_OPADD + TM_ADD)); 308 L->top--; 309 lua_unlock(L); 310 } 311 312 313 LUA_API int lua_compare (lua_State *L, int index1, int index2, int op) { 314 StkId o1, o2; 315 int i = 0; 316 lua_lock(L); /* may call tag method */ 317 o1 = index2addr(L, index1); 318 o2 = index2addr(L, index2); 319 if (isvalid(o1) && isvalid(o2)) { 320 switch (op) { 321 case LUA_OPEQ: i = equalobj(L, o1, o2); break; 322 case LUA_OPLT: i = luaV_lessthan(L, o1, o2); break; 323 case LUA_OPLE: i = luaV_lessequal(L, o1, o2); break; 324 default: api_check(L, 0, "invalid option"); 325 } 326 } 327 lua_unlock(L); 328 return i; 329 } 330 331 332 LUA_API lua_Number lua_tonumberx (lua_State *L, int idx, int *isnum) { 333 TValue n; 334 const TValue *o = index2addr(L, idx); 335 if (tonumber(o, &n)) { 336 if (isnum) *isnum = 1; 337 return nvalue(o); 338 } 339 else { 340 if (isnum) *isnum = 0; 341 return 0; 342 } 343 } 344 345 346 LUA_API lua_Integer lua_tointegerx (lua_State *L, int idx, int *isnum) { 347 TValue n; 348 const TValue *o = index2addr(L, idx); 349 if (tonumber(o, &n)) { 350 lua_Integer res; 351 lua_Number num = nvalue(o); 352 lua_number2integer(res, num); 353 if (isnum) *isnum = 1; 354 return res; 355 } 356 else { 357 if (isnum) *isnum = 0; 358 return 0; 359 } 360 } 361 362 363 LUA_API lua_Unsigned lua_tounsignedx (lua_State *L, int idx, int *isnum) { 364 TValue n; 365 const TValue *o = index2addr(L, idx); 366 if (tonumber(o, &n)) { 367 lua_Unsigned res; 368 lua_Number num = nvalue(o); 369 lua_number2unsigned(res, num); 370 if (isnum) *isnum = 1; 371 return res; 372 } 373 else { 374 if (isnum) *isnum = 0; 375 return 0; 376 } 377 } 378 379 380 LUA_API int lua_toboolean (lua_State *L, int idx) { 381 const TValue *o = index2addr(L, idx); 382 return !l_isfalse(o); 383 } 384 385 386 LUA_API const char *lua_tolstring (lua_State *L, int idx, size_t *len) { 387 StkId o = index2addr(L, idx); 388 if (!ttisstring(o)) { 389 lua_lock(L); /* `luaV_tostring' may create a new string */ 390 if (!luaV_tostring(L, o)) { /* conversion failed? */ 391 if (len != NULL) *len = 0; 392 lua_unlock(L); 393 return NULL; 394 } 395 luaC_checkGC(L); 396 o = index2addr(L, idx); /* previous call may reallocate the stack */ 397 lua_unlock(L); 398 } 399 if (len != NULL) *len = tsvalue(o)->len; 400 return svalue(o); 401 } 402 403 404 LUA_API size_t lua_rawlen (lua_State *L, int idx) { 405 StkId o = index2addr(L, idx); 406 switch (ttypenv(o)) { 407 case LUA_TSTRING: return tsvalue(o)->len; 408 case LUA_TUSERDATA: return uvalue(o)->len; 409 case LUA_TTABLE: return luaH_getn(hvalue(o)); 410 default: return 0; 411 } 412 } 413 414 415 LUA_API lua_CFunction lua_tocfunction (lua_State *L, int idx) { 416 StkId o = index2addr(L, idx); 417 if (ttislcf(o)) return fvalue(o); 418 else if (ttisCclosure(o)) 419 return clCvalue(o)->f; 420 else return NULL; /* not a C function */ 421 } 422 423 424 LUA_API void *lua_touserdata (lua_State *L, int idx) { 425 StkId o = index2addr(L, idx); 426 switch (ttypenv(o)) { 427 case LUA_TUSERDATA: return ((void *)(rawuvalue(o) + 1)); 428 case LUA_TLIGHTUSERDATA: return pvalue(o); 429 default: return NULL; 430 } 431 } 432 433 434 LUA_API lua_State *lua_tothread (lua_State *L, int idx) { 435 StkId o = index2addr(L, idx); 436 return (!ttisthread(o)) ? NULL : thvalue(o); 437 } 438 439 440 LUA_API const void *lua_topointer (lua_State *L, int idx) { 441 StkId o = index2addr(L, idx); 442 switch (ttype(o)) { 443 case LUA_TTABLE: return hvalue(o); 444 case LUA_TLCL: return clLvalue(o); 445 case LUA_TCCL: return clCvalue(o); 446 case LUA_TLCF: return cast(void *, cast(size_t, fvalue(o))); 447 case LUA_TTHREAD: return thvalue(o); 448 case LUA_TUSERDATA: 449 case LUA_TLIGHTUSERDATA: 450 return lua_touserdata(L, idx); 451 default: return NULL; 452 } 453 } 454 455 456 457 /* 458 ** push functions (C -> stack) 459 */ 460 461 462 LUA_API void lua_pushnil (lua_State *L) { 463 lua_lock(L); 464 setnilvalue(L->top); 465 api_incr_top(L); 466 lua_unlock(L); 467 } 468 469 470 LUA_API void lua_pushnumber (lua_State *L, lua_Number n) { 471 lua_lock(L); 472 setnvalue(L->top, n); 473 luai_checknum(L, L->top, 474 luaG_runerror(L, "C API - attempt to push a signaling NaN")); 475 api_incr_top(L); 476 lua_unlock(L); 477 } 478 479 480 LUA_API void lua_pushinteger (lua_State *L, lua_Integer n) { 481 lua_lock(L); 482 setnvalue(L->top, cast_num(n)); 483 api_incr_top(L); 484 lua_unlock(L); 485 } 486 487 488 LUA_API void lua_pushunsigned (lua_State *L, lua_Unsigned u) { 489 lua_Number n; 490 lua_lock(L); 491 n = lua_unsigned2number(u); 492 setnvalue(L->top, n); 493 api_incr_top(L); 494 lua_unlock(L); 495 } 496 497 498 LUA_API const char *lua_pushlstring (lua_State *L, const char *s, size_t len) { 499 TString *ts; 500 lua_lock(L); 501 luaC_checkGC(L); 502 ts = luaS_newlstr(L, s, len); 503 setsvalue2s(L, L->top, ts); 504 api_incr_top(L); 505 lua_unlock(L); 506 return getstr(ts); 507 } 508 509 510 LUA_API const char *lua_pushstring (lua_State *L, const char *s) { 511 if (s == NULL) { 512 lua_pushnil(L); 513 return NULL; 514 } 515 else { 516 TString *ts; 517 lua_lock(L); 518 luaC_checkGC(L); 519 ts = luaS_new(L, s); 520 setsvalue2s(L, L->top, ts); 521 api_incr_top(L); 522 lua_unlock(L); 523 return getstr(ts); 524 } 525 } 526 527 528 LUA_API const char *lua_pushvfstring (lua_State *L, const char *fmt, 529 va_list argp) { 530 const char *ret; 531 lua_lock(L); 532 luaC_checkGC(L); 533 ret = luaO_pushvfstring(L, fmt, argp); 534 lua_unlock(L); 535 return ret; 536 } 537 538 539 LUA_API const char *lua_pushfstring (lua_State *L, const char *fmt, ...) { 540 const char *ret; 541 va_list argp; 542 lua_lock(L); 543 luaC_checkGC(L); 544 va_start(argp, fmt); 545 ret = luaO_pushvfstring(L, fmt, argp); 546 va_end(argp); 547 lua_unlock(L); 548 return ret; 549 } 550 551 552 LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) { 553 lua_lock(L); 554 if (n == 0) { 555 setfvalue(L->top, fn); 556 } 557 else { 558 Closure *cl; 559 api_checknelems(L, n); 560 api_check(L, n <= MAXUPVAL, "upvalue index too large"); 561 luaC_checkGC(L); 562 cl = luaF_newCclosure(L, n); 563 cl->c.f = fn; 564 L->top -= n; 565 while (n--) 566 setobj2n(L, &cl->c.upvalue[n], L->top + n); 567 setclCvalue(L, L->top, cl); 568 } 569 api_incr_top(L); 570 lua_unlock(L); 571 } 572 573 574 LUA_API void lua_pushboolean (lua_State *L, int b) { 575 lua_lock(L); 576 setbvalue(L->top, (b != 0)); /* ensure that true is 1 */ 577 api_incr_top(L); 578 lua_unlock(L); 579 } 580 581 582 LUA_API void lua_pushlightuserdata (lua_State *L, void *p) { 583 lua_lock(L); 584 setpvalue(L->top, p); 585 api_incr_top(L); 586 lua_unlock(L); 587 } 588 589 590 LUA_API int lua_pushthread (lua_State *L) { 591 lua_lock(L); 592 setthvalue(L, L->top, L); 593 api_incr_top(L); 594 lua_unlock(L); 595 return (G(L)->mainthread == L); 596 } 597 598 599 600 /* 601 ** get functions (Lua -> stack) 602 */ 603 604 605 LUA_API void lua_getglobal (lua_State *L, const char *var) { 606 Table *reg = hvalue(&G(L)->l_registry); 607 const TValue *gt; /* global table */ 608 lua_lock(L); 609 gt = luaH_getint(reg, LUA_RIDX_GLOBALS); 610 setsvalue2s(L, L->top++, luaS_new(L, var)); 611 luaV_gettable(L, gt, L->top - 1, L->top - 1); 612 lua_unlock(L); 613 } 614 615 616 LUA_API void lua_gettable (lua_State *L, int idx) { 617 StkId t; 618 lua_lock(L); 619 t = index2addr(L, idx); 620 luaV_gettable(L, t, L->top - 1, L->top - 1); 621 lua_unlock(L); 622 } 623 624 625 LUA_API void lua_getfield (lua_State *L, int idx, const char *k) { 626 StkId t; 627 lua_lock(L); 628 t = index2addr(L, idx); 629 setsvalue2s(L, L->top, luaS_new(L, k)); 630 api_incr_top(L); 631 luaV_gettable(L, t, L->top - 1, L->top - 1); 632 lua_unlock(L); 633 } 634 635 636 LUA_API void lua_rawget (lua_State *L, int idx) { 637 StkId t; 638 lua_lock(L); 639 t = index2addr(L, idx); 640 api_check(L, ttistable(t), "table expected"); 641 setobj2s(L, L->top - 1, luaH_get(hvalue(t), L->top - 1)); 642 lua_unlock(L); 643 } 644 645 646 LUA_API void lua_rawgeti (lua_State *L, int idx, int n) { 647 StkId t; 648 lua_lock(L); 649 t = index2addr(L, idx); 650 api_check(L, ttistable(t), "table expected"); 651 setobj2s(L, L->top, luaH_getint(hvalue(t), n)); 652 api_incr_top(L); 653 lua_unlock(L); 654 } 655 656 657 LUA_API void lua_rawgetp (lua_State *L, int idx, const void *p) { 658 StkId t; 659 TValue k; 660 lua_lock(L); 661 t = index2addr(L, idx); 662 api_check(L, ttistable(t), "table expected"); 663 setpvalue(&k, cast(void *, p)); 664 setobj2s(L, L->top, luaH_get(hvalue(t), &k)); 665 api_incr_top(L); 666 lua_unlock(L); 667 } 668 669 670 LUA_API void lua_createtable (lua_State *L, int narray, int nrec) { 671 Table *t; 672 lua_lock(L); 673 luaC_checkGC(L); 674 t = luaH_new(L); 675 sethvalue(L, L->top, t); 676 api_incr_top(L); 677 if (narray > 0 || nrec > 0) 678 luaH_resize(L, t, narray, nrec); 679 lua_unlock(L); 680 } 681 682 683 LUA_API int lua_getmetatable (lua_State *L, int objindex) { 684 const TValue *obj; 685 Table *mt = NULL; 686 int res; 687 lua_lock(L); 688 obj = index2addr(L, objindex); 689 switch (ttypenv(obj)) { 690 case LUA_TTABLE: 691 mt = hvalue(obj)->metatable; 692 break; 693 case LUA_TUSERDATA: 694 mt = uvalue(obj)->metatable; 695 break; 696 default: 697 mt = G(L)->mt[ttypenv(obj)]; 698 break; 699 } 700 if (mt == NULL) 701 res = 0; 702 else { 703 sethvalue(L, L->top, mt); 704 api_incr_top(L); 705 res = 1; 706 } 707 lua_unlock(L); 708 return res; 709 } 710 711 712 LUA_API void lua_getuservalue (lua_State *L, int idx) { 713 StkId o; 714 lua_lock(L); 715 o = index2addr(L, idx); 716 api_check(L, ttisuserdata(o), "userdata expected"); 717 if (uvalue(o)->env) { 718 sethvalue(L, L->top, uvalue(o)->env); 719 } else 720 setnilvalue(L->top); 721 api_incr_top(L); 722 lua_unlock(L); 723 } 724 725 726 /* 727 ** set functions (stack -> Lua) 728 */ 729 730 731 LUA_API void lua_setglobal (lua_State *L, const char *var) { 732 Table *reg = hvalue(&G(L)->l_registry); 733 const TValue *gt; /* global table */ 734 lua_lock(L); 735 api_checknelems(L, 1); 736 gt = luaH_getint(reg, LUA_RIDX_GLOBALS); 737 setsvalue2s(L, L->top++, luaS_new(L, var)); 738 luaV_settable(L, gt, L->top - 1, L->top - 2); 739 L->top -= 2; /* pop value and key */ 740 lua_unlock(L); 741 } 742 743 744 LUA_API void lua_settable (lua_State *L, int idx) { 745 StkId t; 746 lua_lock(L); 747 api_checknelems(L, 2); 748 t = index2addr(L, idx); 749 luaV_settable(L, t, L->top - 2, L->top - 1); 750 L->top -= 2; /* pop index and value */ 751 lua_unlock(L); 752 } 753 754 755 LUA_API void lua_setfield (lua_State *L, int idx, const char *k) { 756 StkId t; 757 lua_lock(L); 758 api_checknelems(L, 1); 759 t = index2addr(L, idx); 760 setsvalue2s(L, L->top++, luaS_new(L, k)); 761 luaV_settable(L, t, L->top - 1, L->top - 2); 762 L->top -= 2; /* pop value and key */ 763 lua_unlock(L); 764 } 765 766 767 LUA_API void lua_rawset (lua_State *L, int idx) { 768 StkId t; 769 lua_lock(L); 770 api_checknelems(L, 2); 771 t = index2addr(L, idx); 772 api_check(L, ttistable(t), "table expected"); 773 setobj2t(L, luaH_set(L, hvalue(t), L->top-2), L->top-1); 774 invalidateTMcache(hvalue(t)); 775 luaC_barrierback(L, gcvalue(t), L->top-1); 776 L->top -= 2; 777 lua_unlock(L); 778 } 779 780 781 LUA_API void lua_rawseti (lua_State *L, int idx, int n) { 782 StkId t; 783 lua_lock(L); 784 api_checknelems(L, 1); 785 t = index2addr(L, idx); 786 api_check(L, ttistable(t), "table expected"); 787 luaH_setint(L, hvalue(t), n, L->top - 1); 788 luaC_barrierback(L, gcvalue(t), L->top-1); 789 L->top--; 790 lua_unlock(L); 791 } 792 793 794 LUA_API void lua_rawsetp (lua_State *L, int idx, const void *p) { 795 StkId t; 796 TValue k; 797 lua_lock(L); 798 api_checknelems(L, 1); 799 t = index2addr(L, idx); 800 api_check(L, ttistable(t), "table expected"); 801 setpvalue(&k, cast(void *, p)); 802 setobj2t(L, luaH_set(L, hvalue(t), &k), L->top - 1); 803 luaC_barrierback(L, gcvalue(t), L->top - 1); 804 L->top--; 805 lua_unlock(L); 806 } 807 808 809 LUA_API int lua_setmetatable (lua_State *L, int objindex) { 810 TValue *obj; 811 Table *mt; 812 lua_lock(L); 813 api_checknelems(L, 1); 814 obj = index2addr(L, objindex); 815 if (ttisnil(L->top - 1)) 816 mt = NULL; 817 else { 818 api_check(L, ttistable(L->top - 1), "table expected"); 819 mt = hvalue(L->top - 1); 820 } 821 switch (ttypenv(obj)) { 822 case LUA_TTABLE: { 823 hvalue(obj)->metatable = mt; 824 if (mt) { 825 luaC_objbarrierback(L, gcvalue(obj), mt); 826 luaC_checkfinalizer(L, gcvalue(obj), mt); 827 } 828 break; 829 } 830 case LUA_TUSERDATA: { 831 uvalue(obj)->metatable = mt; 832 if (mt) { 833 luaC_objbarrier(L, rawuvalue(obj), mt); 834 luaC_checkfinalizer(L, gcvalue(obj), mt); 835 } 836 break; 837 } 838 default: { 839 G(L)->mt[ttypenv(obj)] = mt; 840 break; 841 } 842 } 843 L->top--; 844 lua_unlock(L); 845 return 1; 846 } 847 848 849 LUA_API void lua_setuservalue (lua_State *L, int idx) { 850 StkId o; 851 lua_lock(L); 852 api_checknelems(L, 1); 853 o = index2addr(L, idx); 854 api_check(L, ttisuserdata(o), "userdata expected"); 855 if (ttisnil(L->top - 1)) 856 uvalue(o)->env = NULL; 857 else { 858 api_check(L, ttistable(L->top - 1), "table expected"); 859 uvalue(o)->env = hvalue(L->top - 1); 860 luaC_objbarrier(L, gcvalue(o), hvalue(L->top - 1)); 861 } 862 L->top--; 863 lua_unlock(L); 864 } 865 866 867 /* 868 ** `load' and `call' functions (run Lua code) 869 */ 870 871 872 #define checkresults(L,na,nr) \ 873 api_check(L, (nr) == LUA_MULTRET || (L->ci->top - L->top >= (nr) - (na)), \ 874 "results from function overflow current stack size") 875 876 877 LUA_API int lua_getctx (lua_State *L, int *ctx) { 878 if (L->ci->callstatus & CIST_YIELDED) { 879 if (ctx) *ctx = L->ci->u.c.ctx; 880 return L->ci->u.c.status; 881 } 882 else return LUA_OK; 883 } 884 885 886 LUA_API void lua_callk (lua_State *L, int nargs, int nresults, int ctx, 887 lua_CFunction k) { 888 StkId func; 889 lua_lock(L); 890 api_check(L, k == NULL || !isLua(L->ci), 891 "cannot use continuations inside hooks"); 892 api_checknelems(L, nargs+1); 893 api_check(L, L->status == LUA_OK, "cannot do calls on non-normal thread"); 894 checkresults(L, nargs, nresults); 895 func = L->top - (nargs+1); 896 if (k != NULL && L->nny == 0) { /* need to prepare continuation? */ 897 L->ci->u.c.k = k; /* save continuation */ 898 L->ci->u.c.ctx = ctx; /* save context */ 899 luaD_call(L, func, nresults, 1); /* do the call */ 900 } 901 else /* no continuation or no yieldable */ 902 luaD_call(L, func, nresults, 0); /* just do the call */ 903 adjustresults(L, nresults); 904 lua_unlock(L); 905 } 906 907 908 909 /* 910 ** Execute a protected call. 911 */ 912 struct CallS { /* data to `f_call' */ 913 StkId func; 914 int nresults; 915 }; 916 917 918 static void f_call (lua_State *L, void *ud) { 919 struct CallS *c = cast(struct CallS *, ud); 920 luaD_call(L, c->func, c->nresults, 0); 921 } 922 923 924 925 LUA_API int lua_pcallk (lua_State *L, int nargs, int nresults, int errfunc, 926 int ctx, lua_CFunction k) { 927 struct CallS c; 928 int status; 929 ptrdiff_t func; 930 lua_lock(L); 931 api_check(L, k == NULL || !isLua(L->ci), 932 "cannot use continuations inside hooks"); 933 api_checknelems(L, nargs+1); 934 api_check(L, L->status == LUA_OK, "cannot do calls on non-normal thread"); 935 checkresults(L, nargs, nresults); 936 if (errfunc == 0) 937 func = 0; 938 else { 939 StkId o = index2addr(L, errfunc); 940 api_checkstackindex(L, errfunc, o); 941 func = savestack(L, o); 942 } 943 c.func = L->top - (nargs+1); /* function to be called */ 944 if (k == NULL || L->nny > 0) { /* no continuation or no yieldable? */ 945 c.nresults = nresults; /* do a 'conventional' protected call */ 946 status = luaD_pcall(L, f_call, &c, savestack(L, c.func), func); 947 } 948 else { /* prepare continuation (call is already protected by 'resume') */ 949 CallInfo *ci = L->ci; 950 ci->u.c.k = k; /* save continuation */ 951 ci->u.c.ctx = ctx; /* save context */ 952 /* save information for error recovery */ 953 ci->extra = savestack(L, c.func); 954 ci->u.c.old_allowhook = L->allowhook; 955 ci->u.c.old_errfunc = L->errfunc; 956 L->errfunc = func; 957 /* mark that function may do error recovery */ 958 ci->callstatus |= CIST_YPCALL; 959 luaD_call(L, c.func, nresults, 1); /* do the call */ 960 ci->callstatus &= ~CIST_YPCALL; 961 L->errfunc = ci->u.c.old_errfunc; 962 status = LUA_OK; /* if it is here, there were no errors */ 963 } 964 adjustresults(L, nresults); 965 lua_unlock(L); 966 return status; 967 } 968 969 970 LUA_API int lua_load (lua_State *L, lua_Reader reader, void *data, 971 const char *chunkname, const char *mode) { 972 ZIO z; 973 int status; 974 lua_lock(L); 975 if (!chunkname) chunkname = "?"; 976 luaZ_init(L, &z, reader, data); 977 status = luaD_protectedparser(L, &z, chunkname, mode); 978 if (status == LUA_OK) { /* no errors? */ 979 LClosure *f = clLvalue(L->top - 1); /* get newly created function */ 980 if (f->nupvalues == 1) { /* does it have one upvalue? */ 981 /* get global table from registry */ 982 Table *reg = hvalue(&G(L)->l_registry); 983 const TValue *gt = luaH_getint(reg, LUA_RIDX_GLOBALS); 984 /* set global table as 1st upvalue of 'f' (may be LUA_ENV) */ 985 setobj(L, f->upvals[0]->v, gt); 986 luaC_barrier(L, f->upvals[0], gt); 987 } 988 } 989 lua_unlock(L); 990 return status; 991 } 992 993 #if defined(LUA_USE_DUMP) 994 LUA_API int lua_dump (lua_State *L, lua_Writer writer, void *data) { 995 int status; 996 TValue *o; 997 lua_lock(L); 998 api_checknelems(L, 1); 999 o = L->top - 1; 1000 if (isLfunction(o)) 1001 status = luaU_dump(L, getproto(o), writer, data, 0); 1002 else 1003 status = 1; 1004 lua_unlock(L); 1005 return status; 1006 } 1007 #endif 1008 1009 LUA_API int lua_status (lua_State *L) { 1010 return L->status; 1011 } 1012 1013 1014 /* 1015 ** Garbage-collection function 1016 */ 1017 1018 LUA_API int lua_gc (lua_State *L, int what, int data) { 1019 int res = 0; 1020 global_State *g; 1021 lua_lock(L); 1022 g = G(L); 1023 switch (what) { 1024 case LUA_GCSTOP: { 1025 g->gcrunning = 0; 1026 break; 1027 } 1028 case LUA_GCRESTART: { 1029 luaE_setdebt(g, 0); 1030 g->gcrunning = 1; 1031 break; 1032 } 1033 case LUA_GCCOLLECT: { 1034 luaC_fullgc(L, 0); 1035 break; 1036 } 1037 case LUA_GCCOUNT: { 1038 /* GC values are expressed in Kbytes: #bytes/2^10 */ 1039 res = cast_int(gettotalbytes(g) >> 10); 1040 break; 1041 } 1042 case LUA_GCCOUNTB: { 1043 res = cast_int(gettotalbytes(g) & 0x3ff); 1044 break; 1045 } 1046 case LUA_GCSTEP: { 1047 if (g->gckind == KGC_GEN) { /* generational mode? */ 1048 res = (g->GCestimate == 0); /* true if it will do major collection */ 1049 luaC_forcestep(L); /* do a single step */ 1050 } 1051 else { 1052 lu_mem debt = cast(lu_mem, data) * 1024 - GCSTEPSIZE; 1053 if (g->gcrunning) 1054 debt += g->GCdebt; /* include current debt */ 1055 luaE_setdebt(g, debt); 1056 luaC_forcestep(L); 1057 if (g->gcstate == GCSpause) /* end of cycle? */ 1058 res = 1; /* signal it */ 1059 } 1060 break; 1061 } 1062 case LUA_GCSETPAUSE: { 1063 res = g->gcpause; 1064 g->gcpause = data; 1065 break; 1066 } 1067 case LUA_GCSETMAJORINC: { 1068 res = g->gcmajorinc; 1069 g->gcmajorinc = data; 1070 break; 1071 } 1072 case LUA_GCSETSTEPMUL: { 1073 res = g->gcstepmul; 1074 g->gcstepmul = data; 1075 break; 1076 } 1077 case LUA_GCISRUNNING: { 1078 res = g->gcrunning; 1079 break; 1080 } 1081 case LUA_GCGEN: { /* change collector to generational mode */ 1082 luaC_changemode(L, KGC_GEN); 1083 break; 1084 } 1085 case LUA_GCINC: { /* change collector to incremental mode */ 1086 luaC_changemode(L, KGC_NORMAL); 1087 break; 1088 } 1089 default: res = -1; /* invalid option */ 1090 } 1091 lua_unlock(L); 1092 return res; 1093 } 1094 1095 1096 1097 /* 1098 ** miscellaneous functions 1099 */ 1100 1101 1102 LUA_API int lua_error (lua_State *L) { 1103 lua_lock(L); 1104 api_checknelems(L, 1); 1105 luaG_errormsg(L); 1106 /* code unreachable; will unlock when control actually leaves the kernel */ 1107 return 0; /* to avoid warnings */ 1108 } 1109 1110 1111 LUA_API int lua_next (lua_State *L, int idx) { 1112 StkId t; 1113 int more; 1114 lua_lock(L); 1115 t = index2addr(L, idx); 1116 api_check(L, ttistable(t), "table expected"); 1117 more = luaH_next(L, hvalue(t), L->top - 1); 1118 if (more) { 1119 api_incr_top(L); 1120 } 1121 else /* no more elements */ 1122 L->top -= 1; /* remove key */ 1123 lua_unlock(L); 1124 return more; 1125 } 1126 1127 1128 LUA_API void lua_concat (lua_State *L, int n) { 1129 lua_lock(L); 1130 api_checknelems(L, n); 1131 if (n >= 2) { 1132 luaC_checkGC(L); 1133 luaV_concat(L, n); 1134 } 1135 else if (n == 0) { /* push empty string */ 1136 setsvalue2s(L, L->top, luaS_newlstr(L, "", 0)); 1137 api_incr_top(L); 1138 } 1139 /* else n == 1; nothing to do */ 1140 lua_unlock(L); 1141 } 1142 1143 1144 LUA_API void lua_len (lua_State *L, int idx) { 1145 StkId t; 1146 lua_lock(L); 1147 t = index2addr(L, idx); 1148 luaV_objlen(L, L->top, t); 1149 api_incr_top(L); 1150 lua_unlock(L); 1151 } 1152 1153 1154 LUA_API lua_Alloc lua_getallocf (lua_State *L, void **ud) { 1155 lua_Alloc f; 1156 lua_lock(L); 1157 if (ud) *ud = G(L)->ud; 1158 f = G(L)->frealloc; 1159 lua_unlock(L); 1160 return f; 1161 } 1162 1163 1164 LUA_API void lua_setallocf (lua_State *L, lua_Alloc f, void *ud) { 1165 lua_lock(L); 1166 G(L)->ud = ud; 1167 G(L)->frealloc = f; 1168 lua_unlock(L); 1169 } 1170 1171 1172 LUA_API void *lua_newuserdata (lua_State *L, size_t size) { 1173 Udata *u; 1174 lua_lock(L); 1175 luaC_checkGC(L); 1176 u = luaS_newudata(L, size, NULL); 1177 setuvalue(L, L->top, u); 1178 api_incr_top(L); 1179 lua_unlock(L); 1180 return u + 1; 1181 } 1182 1183 1184 1185 static const char *aux_upvalue (StkId fi, int n, TValue **val, 1186 GCObject **owner) { 1187 switch (ttype(fi)) { 1188 case LUA_TCCL: { /* C closure */ 1189 CClosure *f = clCvalue(fi); 1190 if (!(1 <= n && n <= f->nupvalues)) return NULL; 1191 *val = &f->upvalue[n-1]; 1192 if (owner) *owner = obj2gco(f); 1193 return ""; 1194 } 1195 case LUA_TLCL: { /* Lua closure */ 1196 LClosure *f = clLvalue(fi); 1197 TString *name; 1198 Proto *p = f->p; 1199 if (!(1 <= n && n <= p->sizeupvalues)) return NULL; 1200 *val = f->upvals[n-1]->v; 1201 if (owner) *owner = obj2gco(f->upvals[n - 1]); 1202 name = p->upvalues[n-1].name; 1203 return (name == NULL) ? "" : getstr(name); 1204 } 1205 default: return NULL; /* not a closure */ 1206 } 1207 } 1208 1209 1210 LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n) { 1211 const char *name; 1212 TValue *val = NULL; /* to avoid warnings */ 1213 lua_lock(L); 1214 name = aux_upvalue(index2addr(L, funcindex), n, &val, NULL); 1215 if (name) { 1216 setobj2s(L, L->top, val); 1217 api_incr_top(L); 1218 } 1219 lua_unlock(L); 1220 return name; 1221 } 1222 1223 1224 LUA_API const char *lua_setupvalue (lua_State *L, int funcindex, int n) { 1225 const char *name; 1226 TValue *val = NULL; /* to avoid warnings */ 1227 GCObject *owner = NULL; /* to avoid warnings */ 1228 StkId fi; 1229 lua_lock(L); 1230 fi = index2addr(L, funcindex); 1231 api_checknelems(L, 1); 1232 name = aux_upvalue(fi, n, &val, &owner); 1233 if (name) { 1234 L->top--; 1235 setobj(L, val, L->top); 1236 luaC_barrier(L, owner, L->top); 1237 } 1238 lua_unlock(L); 1239 return name; 1240 } 1241 1242 1243 static UpVal **getupvalref (lua_State *L, int fidx, int n, LClosure **pf) { 1244 LClosure *f; 1245 StkId fi = index2addr(L, fidx); 1246 api_check(L, ttisLclosure(fi), "Lua function expected"); 1247 f = clLvalue(fi); 1248 api_check(L, (1 <= n && n <= f->p->sizeupvalues), "invalid upvalue index"); 1249 if (pf) *pf = f; 1250 return &f->upvals[n - 1]; /* get its upvalue pointer */ 1251 } 1252 1253 1254 LUA_API void *lua_upvalueid (lua_State *L, int fidx, int n) { 1255 StkId fi = index2addr(L, fidx); 1256 switch (ttype(fi)) { 1257 case LUA_TLCL: { /* lua closure */ 1258 return *getupvalref(L, fidx, n, NULL); 1259 } 1260 case LUA_TCCL: { /* C closure */ 1261 CClosure *f = clCvalue(fi); 1262 api_check(L, 1 <= n && n <= f->nupvalues, "invalid upvalue index"); 1263 return &f->upvalue[n - 1]; 1264 } 1265 default: { 1266 api_check(L, 0, "closure expected"); 1267 return NULL; 1268 } 1269 } 1270 } 1271 1272 1273 LUA_API void lua_upvaluejoin (lua_State *L, int fidx1, int n1, 1274 int fidx2, int n2) { 1275 LClosure *f1; 1276 UpVal **up1 = getupvalref(L, fidx1, n1, &f1); 1277 UpVal **up2 = getupvalref(L, fidx2, n2, NULL); 1278 *up1 = *up2; 1279 luaC_objbarrier(L, f1, *up2); 1280 } 1281 1282 #if defined(_KERNEL) 1283 1284 static int __init 1285 lua_init(void) 1286 { 1287 return (0); 1288 } 1289 1290 static void __exit 1291 lua_fini(void) 1292 { 1293 } 1294 1295 module_init(lua_init); 1296 module_exit(lua_fini); 1297 1298 #endif 1299 /* END CSTYLED */ 1300 1301 ZFS_MODULE_DESCRIPTION("Lua Interpreter for ZFS"); 1302 ZFS_MODULE_AUTHOR("Lua.org"); 1303 ZFS_MODULE_LICENSE("Dual MIT/GPL"); 1304 ZFS_MODULE_VERSION(ZFS_META_VERSION "-" ZFS_META_RELEASE); 1305 1306 EXPORT_SYMBOL(lua_absindex); 1307 EXPORT_SYMBOL(lua_atpanic); 1308 EXPORT_SYMBOL(lua_checkstack); 1309 EXPORT_SYMBOL(lua_close); 1310 EXPORT_SYMBOL(lua_createtable); 1311 EXPORT_SYMBOL(lua_error); 1312 EXPORT_SYMBOL(lua_getfield); 1313 EXPORT_SYMBOL(lua_gettable); 1314 EXPORT_SYMBOL(lua_gettop); 1315 EXPORT_SYMBOL(lua_isnumber); 1316 EXPORT_SYMBOL(lua_isstring); 1317 EXPORT_SYMBOL(lua_newstate); 1318 EXPORT_SYMBOL(lua_newuserdata); 1319 EXPORT_SYMBOL(lua_next); 1320 EXPORT_SYMBOL(lua_pcallk); 1321 EXPORT_SYMBOL(lua_pushboolean); 1322 EXPORT_SYMBOL(lua_pushcclosure); 1323 EXPORT_SYMBOL(lua_pushfstring); 1324 EXPORT_SYMBOL(lua_pushinteger); 1325 EXPORT_SYMBOL(lua_pushlightuserdata); 1326 EXPORT_SYMBOL(lua_pushnil); 1327 EXPORT_SYMBOL(lua_pushnumber); 1328 EXPORT_SYMBOL(lua_pushstring); 1329 EXPORT_SYMBOL(lua_pushvalue); 1330 EXPORT_SYMBOL(lua_pushvfstring); 1331 EXPORT_SYMBOL(lua_remove); 1332 EXPORT_SYMBOL(lua_replace); 1333 EXPORT_SYMBOL(lua_setfield); 1334 EXPORT_SYMBOL(lua_setglobal); 1335 EXPORT_SYMBOL(lua_sethook); 1336 EXPORT_SYMBOL(lua_setmetatable); 1337 EXPORT_SYMBOL(lua_settable); 1338 EXPORT_SYMBOL(lua_settop); 1339 EXPORT_SYMBOL(lua_toboolean); 1340 EXPORT_SYMBOL(lua_tointegerx); 1341 EXPORT_SYMBOL(lua_tolstring); 1342 EXPORT_SYMBOL(lua_tonumberx); 1343 EXPORT_SYMBOL(lua_touserdata); 1344 EXPORT_SYMBOL(lua_type); 1345 EXPORT_SYMBOL(lua_typename); 1346