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00001 /* 00002 ** $Id: lapi.c,v 1.1 2004/03/16 21:58:30 niemeyer Exp $ 00003 ** Lua API 00004 ** See Copyright Notice in lua.h 00005 */ 00006 00007 00008 #include <assert.h> 00009 #include <string.h> 00010 00011 #define lapi_c 00012 00013 #include "lua.h" 00014 00015 #include "lapi.h" 00016 #include "ldebug.h" 00017 #include "ldo.h" 00018 #include "lfunc.h" 00019 #include "lgc.h" 00020 #include "lmem.h" 00021 #include "lobject.h" 00022 #include "lstate.h" 00023 #include "lstring.h" 00024 #include "ltable.h" 00025 #include "ltm.h" 00026 #include "lundump.h" 00027 #include "lvm.h" 00028 00029 00030 /*@unused@*/ 00031 const char lua_ident[] = 00032 "$Lua: " LUA_VERSION " " LUA_COPYRIGHT " $\n" 00033 "$Authors: " LUA_AUTHORS " $\n" 00034 "$URL: www.lua.org $\n"; 00035 00036 00037 00038 #ifndef api_check 00039 #define api_check(L, o) /*{ assert(o); }*/ 00040 #endif 00041 00042 #define api_checknelems(L, n) api_check(L, (n) <= (L->top - L->base)) 00043 00044 #define api_incr_top(L) {api_check(L, L->top < L->ci->top); L->top++;} 00045 00046 00047 00048 00049 /*@dependent@*/ /*@null@*/ 00050 static TObject *negindex (lua_State *L, int idx) 00051 /*@*/ 00052 { 00053 if (idx > LUA_REGISTRYINDEX) { 00054 api_check(L, idx != 0 && -idx <= L->top - L->base); 00055 return L->top+idx; 00056 } 00057 else switch (idx) { /* pseudo-indices */ 00058 case LUA_REGISTRYINDEX: return registry(L); 00059 case LUA_GLOBALSINDEX: return gt(L); 00060 default: { 00061 TObject *func = (L->base - 1); 00062 idx = LUA_GLOBALSINDEX - idx; 00063 lua_assert(iscfunction(func)); 00064 return (idx <= clvalue(func)->c.nupvalues) 00065 ? &clvalue(func)->c.upvalue[idx-1] 00066 : NULL; 00067 } 00068 } 00069 } 00070 00071 00072 /*@dependent@*/ /*@relnull@*/ 00073 static TObject *luaA_index (lua_State *L, int idx) 00074 /*@*/ 00075 { 00076 if (idx > 0) { 00077 api_check(L, idx <= L->top - L->base); 00078 return L->base + idx - 1; 00079 } 00080 else { 00081 TObject *o = negindex(L, idx); 00082 api_check(L, o != NULL); 00083 return o; 00084 } 00085 } 00086 00087 00088 /*@dependent@*/ /*@null@*/ 00089 static TObject *luaA_indexAcceptable (lua_State *L, int idx) 00090 /*@*/ 00091 { 00092 if (idx > 0) { 00093 TObject *o = L->base+(idx-1); 00094 api_check(L, idx <= L->stack_last - L->base); 00095 if (o >= L->top) return NULL; 00096 else return o; 00097 } 00098 else 00099 return negindex(L, idx); 00100 } 00101 00102 00103 void luaA_pushobject (lua_State *L, const TObject *o) { 00104 setobj2s(L->top, o); 00105 incr_top(L); 00106 } 00107 00108 00109 LUA_API int lua_checkstack (lua_State *L, int size) { 00110 int res; 00111 lua_lock(L); 00112 if ((L->top - L->base + size) > LUA_MAXCSTACK) 00113 res = 0; /* stack overflow */ 00114 else { 00115 luaD_checkstack(L, size); 00116 if (L->ci->top < L->top + size) 00117 L->ci->top = L->top + size; 00118 res = 1; 00119 } 00120 lua_unlock(L); 00121 return res; 00122 } 00123 00124 00125 LUA_API void lua_xmove (lua_State *from, lua_State *to, int n) { 00126 int i; 00127 lua_lock(to); 00128 api_checknelems(from, n); 00129 from->top -= n; 00130 for (i = 0; i < n; i++) { 00131 setobj2s(to->top, from->top + i); 00132 api_incr_top(to); 00133 } 00134 lua_unlock(to); 00135 } 00136 00137 00138 LUA_API lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf) { 00139 lua_CFunction old; 00140 lua_lock(L); 00141 old = G(L)->panic; 00142 G(L)->panic = panicf; 00143 lua_unlock(L); 00144 return old; 00145 } 00146 00147 00148 LUA_API lua_State *lua_newthread (lua_State *L) { 00149 lua_State *L1; 00150 lua_lock(L); 00151 luaC_checkGC(L); 00152 L1 = luaE_newthread(L); 00153 setthvalue(L->top, L1); 00154 api_incr_top(L); 00155 lua_unlock(L); 00156 lua_userstateopen(L1); 00157 /*@-kepttrans@*/ 00158 return L1; 00159 /*@=kepttrans@*/ 00160 } 00161 00162 00163 00164 /* 00165 ** basic stack manipulation 00166 */ 00167 00168 00169 LUA_API int lua_gettop (lua_State *L) { 00170 return (L->top - L->base); 00171 } 00172 00173 00174 LUA_API void lua_settop (lua_State *L, int idx) { 00175 lua_lock(L); 00176 if (idx >= 0) { 00177 api_check(L, idx <= L->stack_last - L->base); 00178 while (L->top < L->base + idx) 00179 setnilvalue(L->top++); 00180 L->top = L->base + idx; 00181 } 00182 else { 00183 api_check(L, -(idx+1) <= (L->top - L->base)); 00184 L->top += idx+1; /* `subtract' index (index is negative) */ 00185 } 00186 lua_unlock(L); 00187 } 00188 00189 00190 LUA_API void lua_remove (lua_State *L, int idx) { 00191 StkId p; 00192 lua_lock(L); 00193 p = luaA_index(L, idx); 00194 while (++p < L->top) setobjs2s(p-1, p); 00195 L->top--; 00196 lua_unlock(L); 00197 } 00198 00199 00200 LUA_API void lua_insert (lua_State *L, int idx) { 00201 StkId p; 00202 StkId q; 00203 lua_lock(L); 00204 p = luaA_index(L, idx); 00205 for (q = L->top; q>p; q--) setobjs2s(q, q-1); 00206 setobjs2s(p, L->top); 00207 lua_unlock(L); 00208 } 00209 00210 00211 LUA_API void lua_replace (lua_State *L, int idx) { 00212 lua_lock(L); 00213 api_checknelems(L, 1); 00214 setobj(luaA_index(L, idx), L->top - 1); /* write barrier */ 00215 L->top--; 00216 lua_unlock(L); 00217 } 00218 00219 00220 LUA_API void lua_pushvalue (lua_State *L, int idx) { 00221 lua_lock(L); 00222 setobj2s(L->top, luaA_index(L, idx)); 00223 api_incr_top(L); 00224 lua_unlock(L); 00225 } 00226 00227 00228 00229 /* 00230 ** access functions (stack -> C) 00231 */ 00232 00233 00234 LUA_API int lua_type (lua_State *L, int idx) { 00235 StkId o = luaA_indexAcceptable(L, idx); 00236 return (o == NULL) ? LUA_TNONE : ttype(o); 00237 } 00238 00239 00240 LUA_API const char *lua_typename (lua_State *L, int t) { 00241 UNUSED(L); 00242 return (t == LUA_TNONE) ? "no value" : luaT_typenames[t]; 00243 } 00244 00245 00246 LUA_API int lua_iscfunction (lua_State *L, int idx) { 00247 StkId o = luaA_indexAcceptable(L, idx); 00248 return (o == NULL) ? 0 : iscfunction(o); 00249 } 00250 00251 00252 LUA_API int lua_isnumber (lua_State *L, int idx) { 00253 TObject n; 00254 const TObject *o = luaA_indexAcceptable(L, idx); 00255 return (o != NULL && tonumber(o, &n)); 00256 } 00257 00258 00259 LUA_API int lua_isstring (lua_State *L, int idx) { 00260 int t = lua_type(L, idx); 00261 return (t == LUA_TSTRING || t == LUA_TNUMBER); 00262 } 00263 00264 00265 LUA_API int lua_isuserdata (lua_State *L, int idx) { 00266 const TObject *o = luaA_indexAcceptable(L, idx); 00267 return (o != NULL && (ttisuserdata(o) || ttislightuserdata(o))); 00268 } 00269 00270 00271 LUA_API int lua_rawequal (lua_State *L, int index1, int index2) { 00272 StkId o1 = luaA_indexAcceptable(L, index1); 00273 StkId o2 = luaA_indexAcceptable(L, index2); 00274 return (o1 == NULL || o2 == NULL) ? 0 /* index out of range */ 00275 : luaO_rawequalObj(o1, o2); 00276 } 00277 00278 00279 LUA_API int lua_equal (lua_State *L, int index1, int index2) { 00280 StkId o1, o2; 00281 int i; 00282 lua_lock(L); /* may call tag method */ 00283 o1 = luaA_indexAcceptable(L, index1); 00284 o2 = luaA_indexAcceptable(L, index2); 00285 i = (o1 == NULL || o2 == NULL) ? 0 /* index out of range */ 00286 : equalobj(L, o1, o2); 00287 lua_unlock(L); 00288 return i; 00289 } 00290 00291 00292 LUA_API int lua_lessthan (lua_State *L, int index1, int index2) { 00293 StkId o1, o2; 00294 int i; 00295 lua_lock(L); /* may call tag method */ 00296 o1 = luaA_indexAcceptable(L, index1); 00297 o2 = luaA_indexAcceptable(L, index2); 00298 i = (o1 == NULL || o2 == NULL) ? 0 /* index out-of-range */ 00299 : luaV_lessthan(L, o1, o2); 00300 lua_unlock(L); 00301 return i; 00302 } 00303 00304 00305 00306 LUA_API lua_Number lua_tonumber (lua_State *L, int idx) { 00307 TObject n; 00308 const TObject *o = luaA_indexAcceptable(L, idx); 00309 if (o != NULL && tonumber(o, &n)) 00310 return nvalue(o); 00311 else 00312 return 0; 00313 } 00314 00315 00316 LUA_API int lua_toboolean (lua_State *L, int idx) { 00317 const TObject *o = luaA_indexAcceptable(L, idx); 00318 return (o != NULL) && !l_isfalse(o); 00319 } 00320 00321 00322 LUA_API const char *lua_tostring (lua_State *L, int idx) { 00323 StkId o = luaA_indexAcceptable(L, idx); 00324 if (o == NULL) 00325 return NULL; 00326 else if (ttisstring(o)) 00327 return svalue(o); 00328 else { 00329 const char *s; 00330 lua_lock(L); /* `luaV_tostring' may create a new string */ 00331 s = (luaV_tostring(L, o) ? svalue(o) : NULL); 00332 luaC_checkGC(L); 00333 lua_unlock(L); 00334 return s; 00335 } 00336 } 00337 00338 00339 LUA_API size_t lua_strlen (lua_State *L, int idx) { 00340 StkId o = luaA_indexAcceptable(L, idx); 00341 if (o == NULL) 00342 return 0; 00343 else if (ttisstring(o)) 00344 return tsvalue(o)->tsv.len; 00345 else { 00346 size_t l; 00347 lua_lock(L); /* `luaV_tostring' may create a new string */ 00348 l = (luaV_tostring(L, o) ? tsvalue(o)->tsv.len : 0); 00349 lua_unlock(L); 00350 return l; 00351 } 00352 } 00353 00354 00355 LUA_API lua_CFunction lua_tocfunction (lua_State *L, int idx) { 00356 StkId o = luaA_indexAcceptable(L, idx); 00357 return (o == NULL || !iscfunction(o)) ? NULL : clvalue(o)->c.f; 00358 } 00359 00360 00361 LUA_API void *lua_touserdata (lua_State *L, int idx) { 00362 StkId o = luaA_indexAcceptable(L, idx); 00363 if (o == NULL) return NULL; 00364 switch (ttype(o)) { 00365 case LUA_TUSERDATA: return (uvalue(o) + 1); 00366 case LUA_TLIGHTUSERDATA: return pvalue(o); 00367 default: return NULL; 00368 } 00369 } 00370 00371 00372 LUA_API lua_State *lua_tothread (lua_State *L, int idx) { 00373 StkId o = luaA_indexAcceptable(L, idx); 00374 return (o == NULL || !ttisthread(o)) ? NULL : thvalue(o); 00375 } 00376 00377 00378 LUA_API const void *lua_topointer (lua_State *L, int idx) { 00379 StkId o = luaA_indexAcceptable(L, idx); 00380 if (o == NULL) return NULL; 00381 else { 00382 switch (ttype(o)) { 00383 case LUA_TTABLE: return hvalue(o); 00384 case LUA_TFUNCTION: return clvalue(o); 00385 case LUA_TTHREAD: return thvalue(o); 00386 case LUA_TUSERDATA: 00387 case LUA_TLIGHTUSERDATA: 00388 return lua_touserdata(L, idx); 00389 default: return NULL; 00390 } 00391 } 00392 } 00393 00394 00395 00396 /* 00397 ** push functions (C -> stack) 00398 */ 00399 00400 00401 LUA_API void lua_pushnil (lua_State *L) { 00402 lua_lock(L); 00403 setnilvalue(L->top); 00404 api_incr_top(L); 00405 lua_unlock(L); 00406 } 00407 00408 00409 LUA_API void lua_pushnumber (lua_State *L, lua_Number n) { 00410 lua_lock(L); 00411 setnvalue(L->top, n); 00412 api_incr_top(L); 00413 lua_unlock(L); 00414 } 00415 00416 00417 LUA_API void lua_pushlstring (lua_State *L, const char *s, size_t len) { 00418 lua_lock(L); 00419 luaC_checkGC(L); 00420 setsvalue2s(L->top, luaS_newlstr(L, s, len)); 00421 api_incr_top(L); 00422 lua_unlock(L); 00423 } 00424 00425 00426 LUA_API void lua_pushstring (lua_State *L, const char *s) { 00427 if (s == NULL) 00428 lua_pushnil(L); 00429 else 00430 lua_pushlstring(L, s, strlen(s)); 00431 } 00432 00433 00434 LUA_API const char *lua_pushvfstring (lua_State *L, const char *fmt, 00435 va_list argp) { 00436 const char *ret; 00437 lua_lock(L); 00438 luaC_checkGC(L); 00439 ret = luaO_pushvfstring(L, fmt, argp); 00440 lua_unlock(L); 00441 return ret; 00442 } 00443 00444 00445 LUA_API const char *lua_pushfstring (lua_State *L, const char *fmt, ...) { 00446 const char *ret; 00447 va_list argp; 00448 lua_lock(L); 00449 luaC_checkGC(L); 00450 va_start(argp, fmt); 00451 ret = luaO_pushvfstring(L, fmt, argp); 00452 va_end(argp); 00453 lua_unlock(L); 00454 return ret; 00455 } 00456 00457 00458 LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) { 00459 Closure *cl; 00460 lua_lock(L); 00461 luaC_checkGC(L); 00462 api_checknelems(L, n); 00463 cl = luaF_newCclosure(L, n); 00464 cl->c.f = fn; 00465 L->top -= n; 00466 while (n--) 00467 setobj2n(&cl->c.upvalue[n], L->top+n); 00468 setclvalue(L->top, cl); 00469 api_incr_top(L); 00470 lua_unlock(L); 00471 } 00472 00473 00474 LUA_API void lua_pushboolean (lua_State *L, int b) { 00475 lua_lock(L); 00476 setbvalue(L->top, (b != 0)); /* ensure that true is 1 */ 00477 api_incr_top(L); 00478 lua_unlock(L); 00479 } 00480 00481 00482 LUA_API void lua_pushlightuserdata (lua_State *L, void *p) { 00483 lua_lock(L); 00484 setpvalue(L->top, p); 00485 api_incr_top(L); 00486 lua_unlock(L); 00487 } 00488 00489 00490 00491 /* 00492 ** get functions (Lua -> stack) 00493 */ 00494 00495 00496 LUA_API void lua_gettable (lua_State *L, int idx) { 00497 StkId t; 00498 lua_lock(L); 00499 t = luaA_index(L, idx); 00500 setobj2s(L->top - 1, luaV_gettable(L, t, L->top - 1, 0)); 00501 lua_unlock(L); 00502 } 00503 00504 00505 LUA_API void lua_rawget (lua_State *L, int idx) { 00506 StkId t; 00507 lua_lock(L); 00508 t = luaA_index(L, idx); 00509 api_check(L, ttistable(t)); 00510 setobj2s(L->top - 1, luaH_get(hvalue(t), L->top - 1)); 00511 lua_unlock(L); 00512 } 00513 00514 00515 LUA_API void lua_rawgeti (lua_State *L, int idx, int n) { 00516 StkId o; 00517 lua_lock(L); 00518 o = luaA_index(L, idx); 00519 api_check(L, ttistable(o)); 00520 setobj2s(L->top, luaH_getnum(hvalue(o), n)); 00521 api_incr_top(L); 00522 lua_unlock(L); 00523 } 00524 00525 00526 LUA_API void lua_newtable (lua_State *L) { 00527 lua_lock(L); 00528 luaC_checkGC(L); 00529 sethvalue(L->top, luaH_new(L, 0, 0)); 00530 api_incr_top(L); 00531 lua_unlock(L); 00532 } 00533 00534 00535 LUA_API int lua_getmetatable (lua_State *L, int objindex) { 00536 const TObject *obj; 00537 Table *mt = NULL; 00538 int res; 00539 lua_lock(L); 00540 obj = luaA_indexAcceptable(L, objindex); 00541 if (obj != NULL) { 00542 switch (ttype(obj)) { 00543 case LUA_TTABLE: 00544 mt = hvalue(obj)->metatable; 00545 break; 00546 case LUA_TUSERDATA: 00547 mt = uvalue(obj)->uv.metatable; 00548 break; 00549 } 00550 } 00551 if (mt == NULL || mt == hvalue(defaultmeta(L))) 00552 res = 0; 00553 else { 00554 sethvalue(L->top, mt); 00555 api_incr_top(L); 00556 res = 1; 00557 } 00558 lua_unlock(L); 00559 return res; 00560 } 00561 00562 00563 LUA_API void lua_getfenv (lua_State *L, int idx) { 00564 StkId o; 00565 lua_lock(L); 00566 o = luaA_index(L, idx); 00567 setobj2s(L->top, isLfunction(o) ? &clvalue(o)->l.g : gt(L)); 00568 api_incr_top(L); 00569 lua_unlock(L); 00570 } 00571 00572 00573 /* 00574 ** set functions (stack -> Lua) 00575 */ 00576 00577 00578 LUA_API void lua_settable (lua_State *L, int idx) { 00579 StkId t; 00580 lua_lock(L); 00581 api_checknelems(L, 2); 00582 t = luaA_index(L, idx); 00583 luaV_settable(L, t, L->top - 2, L->top - 1); 00584 L->top -= 2; /* pop index and value */ 00585 lua_unlock(L); 00586 } 00587 00588 00589 LUA_API void lua_rawset (lua_State *L, int idx) { 00590 StkId t; 00591 lua_lock(L); 00592 api_checknelems(L, 2); 00593 t = luaA_index(L, idx); 00594 api_check(L, ttistable(t)); 00595 setobj2t(luaH_set(L, hvalue(t), L->top-2), L->top-1); /* write barrier */ 00596 L->top -= 2; 00597 lua_unlock(L); 00598 } 00599 00600 00601 LUA_API void lua_rawseti (lua_State *L, int idx, int n) { 00602 StkId o; 00603 lua_lock(L); 00604 api_checknelems(L, 1); 00605 o = luaA_index(L, idx); 00606 api_check(L, ttistable(o)); 00607 setobj2t(luaH_setnum(L, hvalue(o), n), L->top-1); /* write barrier */ 00608 L->top--; 00609 lua_unlock(L); 00610 } 00611 00612 00613 LUA_API int lua_setmetatable (lua_State *L, int objindex) { 00614 TObject *obj, *mt; 00615 int res = 1; 00616 lua_lock(L); 00617 api_checknelems(L, 1); 00618 obj = luaA_index(L, objindex); 00619 mt = (!ttisnil(L->top - 1)) ? L->top - 1 : defaultmeta(L); 00620 api_check(L, ttistable(mt)); 00621 switch (ttype(obj)) { 00622 case LUA_TTABLE: { 00623 hvalue(obj)->metatable = hvalue(mt); /* write barrier */ 00624 break; 00625 } 00626 case LUA_TUSERDATA: { 00627 uvalue(obj)->uv.metatable = hvalue(mt); /* write barrier */ 00628 break; 00629 } 00630 default: { 00631 res = 0; /* cannot set */ 00632 break; 00633 } 00634 } 00635 L->top--; 00636 lua_unlock(L); 00637 return res; 00638 } 00639 00640 00641 LUA_API int lua_setfenv (lua_State *L, int idx) { 00642 StkId o; 00643 int res = 0; 00644 lua_lock(L); 00645 api_checknelems(L, 1); 00646 o = luaA_index(L, idx); 00647 L->top--; 00648 api_check(L, ttistable(L->top)); 00649 if (isLfunction(o)) { 00650 res = 1; 00651 clvalue(o)->l.g = *(L->top); 00652 } 00653 lua_unlock(L); 00654 return res; 00655 } 00656 00657 00658 /* 00659 ** `load' and `call' functions (run Lua code) 00660 */ 00661 00662 LUA_API void lua_call (lua_State *L, int nargs, int nresults) { 00663 StkId func; 00664 lua_lock(L); 00665 api_checknelems(L, nargs+1); 00666 func = L->top - (nargs+1); 00667 luaD_call(L, func, nresults); 00668 lua_unlock(L); 00669 } 00670 00671 00672 00673 /* 00674 ** Execute a protected call. 00675 */ 00676 struct CallS { /* data to `f_call' */ 00677 /*@dependent@*/ 00678 StkId func; 00679 int nresults; 00680 }; 00681 00682 00683 static void f_call (lua_State *L, void *ud) 00684 /*@modifies L @*/ 00685 { 00686 struct CallS *c = cast(struct CallS *, ud); 00687 luaD_call(L, c->func, c->nresults); 00688 } 00689 00690 00691 00692 LUA_API int lua_pcall (lua_State *L, int nargs, int nresults, int errfunc) { 00693 struct CallS c; 00694 int status; 00695 ptrdiff_t func; 00696 lua_lock(L); 00697 func = (errfunc == 0) ? 0 : savestack(L, luaA_index(L, errfunc)); 00698 c.func = L->top - (nargs+1); /* function to be called */ 00699 c.nresults = nresults; 00700 status = luaD_pcall(L, f_call, &c, savestack(L, c.func), func); 00701 lua_unlock(L); 00702 return status; 00703 } 00704 00705 00706 /* 00707 ** Execute a protected C call. 00708 */ 00709 struct CCallS { /* data to `f_Ccall' */ 00710 lua_CFunction func; 00711 void *ud; 00712 }; 00713 00714 00715 static void f_Ccall (lua_State *L, void *ud) 00716 /*@modifies L @*/ 00717 { 00718 struct CCallS *c = cast(struct CCallS *, ud); 00719 Closure *cl; 00720 cl = luaF_newCclosure(L, 0); 00721 cl->c.f = c->func; 00722 setclvalue(L->top, cl); /* push function */ 00723 incr_top(L); 00724 setpvalue(L->top, c->ud); /* push only argument */ 00725 incr_top(L); 00726 luaD_call(L, L->top - 2, 0); 00727 } 00728 00729 00730 LUA_API int lua_cpcall (lua_State *L, lua_CFunction func, void *ud) { 00731 struct CCallS c; 00732 int status; 00733 lua_lock(L); 00734 c.func = func; 00735 c.ud = ud; 00736 status = luaD_pcall(L, f_Ccall, &c, savestack(L, L->top), 0); 00737 lua_unlock(L); 00738 return status; 00739 } 00740 00741 00742 LUA_API int lua_load (lua_State *L, lua_Chunkreader reader, void *data, 00743 const char *chunkname) { 00744 ZIO z; 00745 int status; 00746 int c; 00747 lua_lock(L); 00748 if (!chunkname) chunkname = "?"; 00749 luaZ_init(&z, reader, data, chunkname); 00750 c = luaZ_lookahead(&z); 00751 status = luaD_protectedparser(L, &z, (c == LUA_SIGNATURE[0])); 00752 lua_unlock(L); 00753 return status; 00754 } 00755 00756 00757 LUA_API int lua_dump (lua_State *L, lua_Chunkwriter writer, void *data) { 00758 int status; 00759 TObject *o; 00760 lua_lock(L); 00761 api_checknelems(L, 1); 00762 o = L->top - 1; 00763 if (isLfunction(o) && clvalue(o)->l.nupvalues == 0) { 00764 luaU_dump(L, clvalue(o)->l.p, writer, data); 00765 status = 1; 00766 } 00767 else 00768 status = 0; 00769 lua_unlock(L); 00770 return status; 00771 } 00772 00773 00774 /* 00775 ** Garbage-collection functions 00776 */ 00777 00778 /* GC values are expressed in Kbytes: #bytes/2^10 */ 00779 #define GCscalel(x) ((x)>>10) 00780 #define GCscale(x) (cast(int, GCscalel(x))) 00781 #define GCunscale(x) (cast(lu_mem, x)<<10) 00782 00783 LUA_API int lua_getgcthreshold (lua_State *L) { 00784 int threshold; 00785 lua_lock(L); 00786 threshold = GCscale(G(L)->GCthreshold); 00787 lua_unlock(L); 00788 return threshold; 00789 } 00790 00791 LUA_API int lua_getgccount (lua_State *L) { 00792 int count; 00793 lua_lock(L); 00794 count = GCscale(G(L)->nblocks); 00795 lua_unlock(L); 00796 return count; 00797 } 00798 00799 LUA_API void lua_setgcthreshold (lua_State *L, int newthreshold) { 00800 lua_lock(L); 00801 if (cast(lu_mem, newthreshold) > GCscalel(MAX_LUMEM)) 00802 G(L)->GCthreshold = MAX_LUMEM; 00803 else 00804 G(L)->GCthreshold = GCunscale(newthreshold); 00805 luaC_checkGC(L); 00806 lua_unlock(L); 00807 } 00808 00809 00810 /* 00811 ** miscellaneous functions 00812 */ 00813 00814 00815 LUA_API const char *lua_version (void) { 00816 return LUA_VERSION; 00817 } 00818 00819 00820 LUA_API int lua_error (lua_State *L) { 00821 lua_lock(L); 00822 api_checknelems(L, 1); 00823 luaG_errormsg(L); 00824 lua_unlock(L); 00825 return 0; /* to avoid warnings */ 00826 } 00827 00828 00829 LUA_API int lua_next (lua_State *L, int idx) { 00830 StkId t; 00831 int more; 00832 lua_lock(L); 00833 t = luaA_index(L, idx); 00834 api_check(L, ttistable(t)); 00835 more = luaH_next(L, hvalue(t), L->top - 1); 00836 if (more) { 00837 api_incr_top(L); 00838 } 00839 else /* no more elements */ 00840 L->top -= 1; /* remove key */ 00841 lua_unlock(L); 00842 return more; 00843 } 00844 00845 00846 LUA_API void lua_concat (lua_State *L, int n) { 00847 lua_lock(L); 00848 luaC_checkGC(L); 00849 api_checknelems(L, n); 00850 if (n >= 2) { 00851 luaV_concat(L, n, L->top - L->base - 1); 00852 L->top -= (n-1); 00853 } 00854 else if (n == 0) { /* push empty string */ 00855 setsvalue2s(L->top, luaS_newlstr(L, NULL, 0)); 00856 api_incr_top(L); 00857 } 00858 /* else n == 1; nothing to do */ 00859 lua_unlock(L); 00860 } 00861 00862 00863 LUA_API void *lua_newuserdata (lua_State *L, size_t size) { 00864 Udata *u; 00865 lua_lock(L); 00866 luaC_checkGC(L); 00867 u = luaS_newudata(L, size); 00868 setuvalue(L->top, u); 00869 api_incr_top(L); 00870 lua_unlock(L); 00871 /*@-kepttrans@*/ 00872 return u + 1; 00873 /*@=kepttrans@*/ 00874 } 00875 00876 00877 LUA_API int lua_pushupvalues (lua_State *L) { 00878 Closure *func; 00879 int n, i; 00880 lua_lock(L); 00881 api_check(L, iscfunction(L->base - 1)); 00882 func = clvalue(L->base - 1); 00883 n = func->c.nupvalues; 00884 luaD_checkstack(L, n + LUA_MINSTACK); 00885 for (i=0; i<n; i++) { 00886 setobj2s(L->top, &func->c.upvalue[i]); 00887 L->top++; 00888 } 00889 lua_unlock(L); 00890 return n; 00891 } 00892 00893 00894 /*@observer@*/ /*@null@*/ 00895 static const char *aux_upvalue (lua_State *L, int funcindex, int n, 00896 TObject **val) 00897 /*@modifies *val @*/ 00898 { 00899 Closure *f; 00900 StkId fi = luaA_index(L, funcindex); 00901 if (!ttisfunction(fi)) return NULL; 00902 f = clvalue(fi); 00903 if (f->c.isC) { 00904 if (n > f->c.nupvalues) return NULL; 00905 *val = &f->c.upvalue[n-1]; 00906 return ""; 00907 } 00908 else { 00909 Proto *p = f->l.p; 00910 if (n > p->sizeupvalues) return NULL; 00911 /*@-onlytrans@*/ 00912 *val = f->l.upvals[n-1]->v; 00913 /*@=onlytrans@*/ 00914 return getstr(p->upvalues[n-1]); 00915 } 00916 } 00917 00918 00919 LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n) { 00920 const char *name; 00921 TObject *val; 00922 lua_lock(L); 00923 name = aux_upvalue(L, funcindex, n, &val); 00924 if (name) { 00925 setobj2s(L->top, val); 00926 api_incr_top(L); 00927 } 00928 lua_unlock(L); 00929 return name; 00930 } 00931 00932 00933 LUA_API const char *lua_setupvalue (lua_State *L, int funcindex, int n) { 00934 const char *name; 00935 TObject *val; 00936 lua_lock(L); 00937 api_checknelems(L, 1); 00938 name = aux_upvalue(L, funcindex, n, &val); 00939 if (name) { 00940 L->top--; 00941 setobj(val, L->top); /* write barrier */ 00942 } 00943 lua_unlock(L); 00944 return name; 00945 } 00946