Remove building with NOCRYPTO option
[minix.git] / external / mit / lua / dist / src / lvm.c
blob6356464403964d0f4d676471cbd5e029fd429122
1 /* $NetBSD: lvm.c,v 1.7 2015/10/08 13:40:16 mbalmer Exp $ */
3 /*
4 ** Id: lvm.c,v 2.245 2015/06/09 15:53:35 roberto Exp
5 ** Lua virtual machine
6 ** See Copyright Notice in lua.h
7 */
9 #define lvm_c
10 #define LUA_CORE
12 #include "lprefix.h"
14 #ifndef _KERNEL
15 #include <float.h>
16 #include <limits.h>
17 #include <math.h>
18 #include <stdio.h>
19 #include <stdlib.h>
20 #include <string.h>
21 #endif
23 #include "lua.h"
25 #include "ldebug.h"
26 #include "ldo.h"
27 #include "lfunc.h"
28 #include "lgc.h"
29 #include "lobject.h"
30 #include "lopcodes.h"
31 #include "lstate.h"
32 #include "lstring.h"
33 #include "ltable.h"
34 #include "ltm.h"
35 #include "lvm.h"
38 /* limit for table tag-method chains (to avoid loops) */
39 #define MAXTAGLOOP 2000
42 #ifndef _KERNEL
44 ** 'l_intfitsf' checks whether a given integer can be converted to a
45 ** float without rounding. Used in comparisons. Left undefined if
46 ** all integers fit in a float precisely.
48 #if !defined(l_intfitsf)
50 /* number of bits in the mantissa of a float */
51 #define NBM (l_mathlim(MANT_DIG))
54 ** Check whether some integers may not fit in a float, that is, whether
55 ** (maxinteger >> NBM) > 0 (that implies (1 << NBM) <= maxinteger).
56 ** (The shifts are done in parts to avoid shifting by more than the size
57 ** of an integer. In a worst case, NBM == 113 for long double and
58 ** sizeof(integer) == 32.)
60 #if ((((LUA_MAXINTEGER >> (NBM / 4)) >> (NBM / 4)) >> (NBM / 4)) \
61 >> (NBM - (3 * (NBM / 4)))) > 0
63 #define l_intfitsf(i) \
64 (-((lua_Integer)1 << NBM) <= (i) && (i) <= ((lua_Integer)1 << NBM))
66 #endif
68 #endif
69 #endif /*_KERNEL */
71 #ifndef _KERNEL
73 ** Try to convert a value to a float. The float case is already handled
74 ** by the macro 'tonumber'.
76 int luaV_tonumber_ (const TValue *obj, lua_Number *n) {
77 TValue v;
78 if (ttisinteger(obj)) {
79 *n = cast_num(ivalue(obj));
80 return 1;
82 else if (cvt2num(obj) && /* string convertible to number? */
83 luaO_str2num(svalue(obj), &v) == vslen(obj) + 1) {
84 *n = nvalue(&v); /* convert result of 'luaO_str2num' to a float */
85 return 1;
87 else
88 return 0; /* conversion failed */
90 #endif
94 ** try to convert a value to an integer, rounding according to 'mode':
95 ** mode == 0: accepts only integral values
96 ** mode == 1: takes the floor of the number
97 ** mode == 2: takes the ceil of the number
99 int luaV_tointeger (const TValue *obj, lua_Integer *p, int mode) {
100 TValue v;
101 again:
102 #ifndef _KERNEL
103 if (ttisfloat(obj)) {
104 lua_Number n = fltvalue(obj);
105 lua_Number f = l_floor(n);
106 if (n != f) { /* not an integral value? */
107 if (mode == 0) return 0; /* fails if mode demands integral value */
108 else if (mode > 1) /* needs ceil? */
109 f += 1; /* convert floor to ceil (remember: n != f) */
111 return lua_numbertointeger(f, p);
113 else if (ttisinteger(obj)) {
114 #else /* _KERNEL */
115 if (ttisinteger(obj)) {
116 UNUSED(mode);
117 #endif
118 *p = ivalue(obj);
119 return 1;
121 else if (cvt2num(obj) &&
122 luaO_str2num(svalue(obj), &v) == vslen(obj) + 1) {
123 obj = &v;
124 goto again; /* convert result from 'luaO_str2num' to an integer */
126 return 0; /* conversion failed */
130 #ifndef _KERNEL
132 ** Try to convert a 'for' limit to an integer, preserving the
133 ** semantics of the loop.
134 ** (The following explanation assumes a non-negative step; it is valid
135 ** for negative steps mutatis mutandis.)
136 ** If the limit can be converted to an integer, rounding down, that is
137 ** it.
138 ** Otherwise, check whether the limit can be converted to a number. If
139 ** the number is too large, it is OK to set the limit as LUA_MAXINTEGER,
140 ** which means no limit. If the number is too negative, the loop
141 ** should not run, because any initial integer value is larger than the
142 ** limit. So, it sets the limit to LUA_MININTEGER. 'stopnow' corrects
143 ** the extreme case when the initial value is LUA_MININTEGER, in which
144 ** case the LUA_MININTEGER limit would still run the loop once.
146 static int forlimit (const TValue *obj, lua_Integer *p, lua_Integer step,
147 int *stopnow) {
148 *stopnow = 0; /* usually, let loops run */
149 if (!luaV_tointeger(obj, p, (step < 0 ? 2 : 1))) { /* not fit in integer? */
150 lua_Number n; /* try to convert to float */
151 if (!tonumber(obj, &n)) /* cannot convert to float? */
152 return 0; /* not a number */
153 if (luai_numlt(0, n)) { /* if true, float is larger than max integer */
154 *p = LUA_MAXINTEGER;
155 if (step < 0) *stopnow = 1;
157 else { /* float is smaller than min integer */
158 *p = LUA_MININTEGER;
159 if (step >= 0) *stopnow = 1;
162 return 1;
164 #endif
168 ** Main function for table access (invoking metamethods if needed).
169 ** Compute 'val = t[key]'
171 void luaV_gettable (lua_State *L, const TValue *t, TValue *key, StkId val) {
172 int loop; /* counter to avoid infinite loops */
173 for (loop = 0; loop < MAXTAGLOOP; loop++) {
174 const TValue *tm;
175 if (ttistable(t)) { /* 't' is a table? */
176 Table *h = hvalue(t);
177 const TValue *res = luaH_get(h, key); /* do a primitive get */
178 if (!ttisnil(res) || /* result is not nil? */
179 (tm = fasttm(L, h->metatable, TM_INDEX)) == NULL) { /* or no TM? */
180 setobj2s(L, val, res); /* result is the raw get */
181 return;
183 /* else will try metamethod */
185 else if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_INDEX)))
186 luaG_typeerror(L, t, "index"); /* no metamethod */
187 if (ttisfunction(tm)) { /* metamethod is a function */
188 luaT_callTM(L, tm, t, key, val, 1);
189 return;
191 t = tm; /* else repeat access over 'tm' */
193 luaG_runerror(L, "gettable chain too long; possible loop");
198 ** Main function for table assignment (invoking metamethods if needed).
199 ** Compute 't[key] = val'
201 void luaV_settable (lua_State *L, const TValue *t, TValue *key, StkId val) {
202 int loop; /* counter to avoid infinite loops */
203 for (loop = 0; loop < MAXTAGLOOP; loop++) {
204 const TValue *tm;
205 if (ttistable(t)) { /* 't' is a table? */
206 Table *h = hvalue(t);
207 TValue *oldval = cast(TValue *, luaH_get(h, key));
208 /* if previous value is not nil, there must be a previous entry
209 in the table; a metamethod has no relevance */
210 if (!ttisnil(oldval) ||
211 /* previous value is nil; must check the metamethod */
212 ((tm = fasttm(L, h->metatable, TM_NEWINDEX)) == NULL &&
213 /* no metamethod; is there a previous entry in the table? */
214 (oldval != luaO_nilobject ||
215 /* no previous entry; must create one. (The next test is
216 always true; we only need the assignment.) */
217 (oldval = luaH_newkey(L, h, key), 1)))) {
218 /* no metamethod and (now) there is an entry with given key */
219 setobj2t(L, oldval, val); /* assign new value to that entry */
220 invalidateTMcache(h);
221 luaC_barrierback(L, h, val);
222 return;
224 /* else will try the metamethod */
226 else /* not a table; check metamethod */
227 if (ttisnil(tm = luaT_gettmbyobj(L, t, TM_NEWINDEX)))
228 luaG_typeerror(L, t, "index");
229 /* try the metamethod */
230 if (ttisfunction(tm)) {
231 luaT_callTM(L, tm, t, key, val, 0);
232 return;
234 t = tm; /* else repeat assignment over 'tm' */
236 luaG_runerror(L, "settable chain too long; possible loop");
241 ** Compare two strings 'ls' x 'rs', returning an integer smaller-equal-
242 ** -larger than zero if 'ls' is smaller-equal-larger than 'rs'.
243 ** The code is a little tricky because it allows '\0' in the strings
244 ** and it uses 'strcoll' (to respect locales) for each segments
245 ** of the strings.
247 static int l_strcmp (const TString *ls, const TString *rs) {
248 const char *l = getstr(ls);
249 size_t ll = tsslen(ls);
250 const char *r = getstr(rs);
251 size_t lr = tsslen(rs);
252 for (;;) { /* for each segment */
253 int temp = strcoll(l, r);
254 if (temp != 0) /* not equal? */
255 return temp; /* done */
256 else { /* strings are equal up to a '\0' */
257 size_t len = strlen(l); /* index of first '\0' in both strings */
258 if (len == lr) /* 'rs' is finished? */
259 return (len == ll) ? 0 : 1; /* check 'ls' */
260 else if (len == ll) /* 'ls' is finished? */
261 return -1; /* 'ls' is smaller than 'rs' ('rs' is not finished) */
262 /* both strings longer than 'len'; go on comparing after the '\0' */
263 len++;
264 l += len; ll -= len; r += len; lr -= len;
271 ** Check whether integer 'i' is less than float 'f'. If 'i' has an
272 ** exact representation as a float ('l_intfitsf'), compare numbers as
273 ** floats. Otherwise, if 'f' is outside the range for integers, result
274 ** is trivial. Otherwise, compare them as integers. (When 'i' has no
275 ** float representation, either 'f' is "far away" from 'i' or 'f' has
276 ** no precision left for a fractional part; either way, how 'f' is
277 ** truncated is irrelevant.) When 'f' is NaN, comparisons must result
278 ** in false.
280 static int LTintfloat (lua_Integer i, lua_Number f) {
281 #if defined(l_intfitsf)
282 if (!l_intfitsf(i)) {
283 if (f >= -cast_num(LUA_MININTEGER)) /* -minint == maxint + 1 */
284 return 1; /* f >= maxint + 1 > i */
285 else if (f > cast_num(LUA_MININTEGER)) /* minint < f <= maxint ? */
286 return (i < cast(lua_Integer, f)); /* compare them as integers */
287 else /* f <= minint <= i (or 'f' is NaN) --> not(i < f) */
288 return 0;
290 #endif
291 return luai_numlt(cast_num(i), f); /* compare them as floats */
296 ** Check whether integer 'i' is less than or equal to float 'f'.
297 ** See comments on previous function.
299 static int LEintfloat (lua_Integer i, lua_Number f) {
300 #if defined(l_intfitsf)
301 if (!l_intfitsf(i)) {
302 if (f >= -cast_num(LUA_MININTEGER)) /* -minint == maxint + 1 */
303 return 1; /* f >= maxint + 1 > i */
304 else if (f >= cast_num(LUA_MININTEGER)) /* minint <= f <= maxint ? */
305 return (i <= cast(lua_Integer, f)); /* compare them as integers */
306 else /* f < minint <= i (or 'f' is NaN) --> not(i <= f) */
307 return 0;
309 #endif
310 return luai_numle(cast_num(i), f); /* compare them as floats */
315 ** Return 'l < r', for numbers.
317 static int LTnum (const TValue *l, const TValue *r) {
318 if (ttisinteger(l)) {
319 lua_Integer li = ivalue(l);
320 if (ttisinteger(r))
321 return li < ivalue(r); /* both are integers */
322 #ifndef _KERNEL
323 else /* 'l' is int and 'r' is float */
324 return LTintfloat(li, fltvalue(r)); /* l < r ? */
325 #endif
327 #ifndef _KERNEL
328 else {
329 lua_Number lf = fltvalue(l); /* 'l' must be float */
330 if (ttisfloat(r))
331 return luai_numlt(lf, fltvalue(r)); /* both are float */
332 else if (luai_numisnan(lf)) /* 'r' is int and 'l' is float */
333 return 0; /* NaN < i is always false */
334 else /* without NaN, (l < r) <--> not(r <= l) */
335 return !LEintfloat(ivalue(r), lf); /* not (r <= l) ? */
337 #endif
342 ** Return 'l <= r', for numbers.
344 static int LEnum (const TValue *l, const TValue *r) {
345 if (ttisinteger(l)) {
346 lua_Integer li = ivalue(l);
347 if (ttisinteger(r))
348 return li <= ivalue(r); /* both are integers */
349 #ifndef _KERNEL
350 else /* 'l' is int and 'r' is float */
351 return LEintfloat(li, fltvalue(r)); /* l <= r ? */
352 #endif
354 #ifndef _KERNEL
355 else {
356 lua_Number lf = fltvalue(l); /* 'l' must be float */
357 if (ttisfloat(r))
358 return luai_numle(lf, fltvalue(r)); /* both are float */
359 else if (luai_numisnan(lf)) /* 'r' is int and 'l' is float */
360 return 0; /* NaN <= i is always false */
361 else /* without NaN, (l <= r) <--> not(r < l) */
362 return !LTintfloat(ivalue(r), lf); /* not (r < l) ? */
364 #endif
369 ** Main operation less than; return 'l < r'.
371 int luaV_lessthan (lua_State *L, const TValue *l, const TValue *r) {
372 int res;
373 if (ttisnumber(l) && ttisnumber(r)) /* both operands are numbers? */
374 return LTnum(l, r);
375 else if (ttisstring(l) && ttisstring(r)) /* both are strings? */
376 return l_strcmp(tsvalue(l), tsvalue(r)) < 0;
377 else if ((res = luaT_callorderTM(L, l, r, TM_LT)) < 0) /* no metamethod? */
378 luaG_ordererror(L, l, r); /* error */
379 return res;
384 ** Main operation less than or equal to; return 'l <= r'. If it needs
385 ** a metamethod and there is no '__le', try '__lt', based on
386 ** l <= r iff !(r < l) (assuming a total order). If the metamethod
387 ** yields during this substitution, the continuation has to know
388 ** about it (to negate the result of r<l); bit CIST_LEQ in the call
389 ** status keeps that information.
391 int luaV_lessequal (lua_State *L, const TValue *l, const TValue *r) {
392 int res;
393 if (ttisnumber(l) && ttisnumber(r)) /* both operands are numbers? */
394 return LEnum(l, r);
395 else if (ttisstring(l) && ttisstring(r)) /* both are strings? */
396 return l_strcmp(tsvalue(l), tsvalue(r)) <= 0;
397 else if ((res = luaT_callorderTM(L, l, r, TM_LE)) >= 0) /* try 'le' */
398 return res;
399 else { /* try 'lt': */
400 L->ci->callstatus |= CIST_LEQ; /* mark it is doing 'lt' for 'le' */
401 res = luaT_callorderTM(L, r, l, TM_LT);
402 L->ci->callstatus ^= CIST_LEQ; /* clear mark */
403 if (res < 0)
404 luaG_ordererror(L, l, r);
405 return !res; /* result is negated */
411 ** Main operation for equality of Lua values; return 't1 == t2'.
412 ** L == NULL means raw equality (no metamethods)
414 int luaV_equalobj (lua_State *L, const TValue *t1, const TValue *t2) {
415 const TValue *tm;
416 if (ttype(t1) != ttype(t2)) { /* not the same variant? */
417 #ifndef _KERNEL
418 if (ttnov(t1) != ttnov(t2) || ttnov(t1) != LUA_TNUMBER)
419 return 0; /* only numbers can be equal with different variants */
420 else { /* two numbers with different variants */
421 lua_Integer i1, i2; /* compare them as integers */
422 return (tointeger(t1, &i1) && tointeger(t2, &i2) && i1 == i2);
424 #else /* _KERNEL */
425 return 0; /* numbers have only the integer variant */
426 #endif
428 /* values have same type and same variant */
429 switch (ttype(t1)) {
430 case LUA_TNIL: return 1;
431 case LUA_TNUMINT: return (ivalue(t1) == ivalue(t2));
432 #ifndef _KERNEL
433 case LUA_TNUMFLT: return luai_numeq(fltvalue(t1), fltvalue(t2));
434 #endif
435 case LUA_TBOOLEAN: return bvalue(t1) == bvalue(t2); /* true must be 1 !! */
436 case LUA_TLIGHTUSERDATA: return pvalue(t1) == pvalue(t2);
437 case LUA_TLCF: return fvalue(t1) == fvalue(t2);
438 case LUA_TSHRSTR: return eqshrstr(tsvalue(t1), tsvalue(t2));
439 case LUA_TLNGSTR: return luaS_eqlngstr(tsvalue(t1), tsvalue(t2));
440 case LUA_TUSERDATA: {
441 if (uvalue(t1) == uvalue(t2)) return 1;
442 else if (L == NULL) return 0;
443 tm = fasttm(L, uvalue(t1)->metatable, TM_EQ);
444 if (tm == NULL)
445 tm = fasttm(L, uvalue(t2)->metatable, TM_EQ);
446 break; /* will try TM */
448 case LUA_TTABLE: {
449 if (hvalue(t1) == hvalue(t2)) return 1;
450 else if (L == NULL) return 0;
451 tm = fasttm(L, hvalue(t1)->metatable, TM_EQ);
452 if (tm == NULL)
453 tm = fasttm(L, hvalue(t2)->metatable, TM_EQ);
454 break; /* will try TM */
456 default:
457 return gcvalue(t1) == gcvalue(t2);
459 if (tm == NULL) /* no TM? */
460 return 0; /* objects are different */
461 luaT_callTM(L, tm, t1, t2, L->top, 1); /* call TM */
462 return !l_isfalse(L->top);
466 /* macro used by 'luaV_concat' to ensure that element at 'o' is a string */
467 #define tostring(L,o) \
468 (ttisstring(o) || (cvt2str(o) && (luaO_tostring(L, o), 1)))
470 #define isemptystr(o) (ttisshrstring(o) && tsvalue(o)->shrlen == 0)
473 ** Main operation for concatenation: concat 'total' values in the stack,
474 ** from 'L->top - total' up to 'L->top - 1'.
476 void luaV_concat (lua_State *L, int total) {
477 lua_assert(total >= 2);
478 do {
479 StkId top = L->top;
480 int n = 2; /* number of elements handled in this pass (at least 2) */
481 if (!(ttisstring(top-2) || cvt2str(top-2)) || !tostring(L, top-1))
482 luaT_trybinTM(L, top-2, top-1, top-2, TM_CONCAT);
483 else if (isemptystr(top - 1)) /* second operand is empty? */
484 cast_void(tostring(L, top - 2)); /* result is first operand */
485 else if (isemptystr(top - 2)) { /* first operand is an empty string? */
486 setobjs2s(L, top - 2, top - 1); /* result is second op. */
488 else {
489 /* at least two non-empty string values; get as many as possible */
490 size_t tl = vslen(top - 1);
491 char *buffer;
492 int i;
493 /* collect total length */
494 for (i = 1; i < total && tostring(L, top-i-1); i++) {
495 size_t l = vslen(top - i - 1);
496 if (l >= (MAX_SIZE/sizeof(char)) - tl)
497 luaG_runerror(L, "string length overflow");
498 tl += l;
500 buffer = luaZ_openspace(L, &G(L)->buff, tl);
501 tl = 0;
502 n = i;
503 do { /* copy all strings to buffer */
504 size_t l = vslen(top - i);
505 memcpy(buffer+tl, svalue(top-i), l * sizeof(char));
506 tl += l;
507 } while (--i > 0);
508 setsvalue2s(L, top-n, luaS_newlstr(L, buffer, tl)); /* create result */
510 total -= n-1; /* got 'n' strings to create 1 new */
511 L->top -= n-1; /* popped 'n' strings and pushed one */
512 } while (total > 1); /* repeat until only 1 result left */
517 ** Main operation 'ra' = #rb'.
519 void luaV_objlen (lua_State *L, StkId ra, const TValue *rb) {
520 const TValue *tm;
521 switch (ttype(rb)) {
522 case LUA_TTABLE: {
523 Table *h = hvalue(rb);
524 tm = fasttm(L, h->metatable, TM_LEN);
525 if (tm) break; /* metamethod? break switch to call it */
526 setivalue(ra, luaH_getn(h)); /* else primitive len */
527 return;
529 case LUA_TSHRSTR: {
530 setivalue(ra, tsvalue(rb)->shrlen);
531 return;
533 case LUA_TLNGSTR: {
534 setivalue(ra, tsvalue(rb)->u.lnglen);
535 return;
537 default: { /* try metamethod */
538 tm = luaT_gettmbyobj(L, rb, TM_LEN);
539 if (ttisnil(tm)) /* no metamethod? */
540 luaG_typeerror(L, rb, "get length of");
541 break;
544 luaT_callTM(L, tm, rb, rb, ra, 1);
549 ** Integer division; return 'm // n', that is, floor(m/n).
550 ** C division truncates its result (rounds towards zero).
551 ** 'floor(q) == trunc(q)' when 'q >= 0' or when 'q' is integer,
552 ** otherwise 'floor(q) == trunc(q) - 1'.
554 lua_Integer luaV_div (lua_State *L, lua_Integer m, lua_Integer n) {
555 if (l_castS2U(n) + 1u <= 1u) { /* special cases: -1 or 0 */
556 if (n == 0)
557 luaG_runerror(L, "attempt to divide by zero");
558 return intop(-, 0, m); /* n==-1; avoid overflow with 0x80000...//-1 */
560 else {
561 lua_Integer q = m / n; /* perform C division */
562 if ((m ^ n) < 0 && m % n != 0) /* 'm/n' would be negative non-integer? */
563 q -= 1; /* correct result for different rounding */
564 return q;
570 ** Integer modulus; return 'm % n'. (Assume that C '%' with
571 ** negative operands follows C99 behavior. See previous comment
572 ** about luaV_div.)
574 lua_Integer luaV_mod (lua_State *L, lua_Integer m, lua_Integer n) {
575 if (l_castS2U(n) + 1u <= 1u) { /* special cases: -1 or 0 */
576 if (n == 0)
577 luaG_runerror(L, "attempt to perform 'n%%0'");
578 return 0; /* m % -1 == 0; avoid overflow with 0x80000...%-1 */
580 else {
581 lua_Integer r = m % n;
582 if (r != 0 && (m ^ n) < 0) /* 'm/n' would be non-integer negative? */
583 r += n; /* correct result for different rounding */
584 return r;
589 /* number of bits in an integer */
590 #define NBITS cast_int(sizeof(lua_Integer) * CHAR_BIT)
593 ** Shift left operation. (Shift right just negates 'y'.)
595 lua_Integer luaV_shiftl (lua_Integer x, lua_Integer y) {
596 if (y < 0) { /* shift right? */
597 if (y <= -NBITS) return 0;
598 else return intop(>>, x, -y);
600 else { /* shift left */
601 if (y >= NBITS) return 0;
602 else return intop(<<, x, y);
608 ** check whether cached closure in prototype 'p' may be reused, that is,
609 ** whether there is a cached closure with the same upvalues needed by
610 ** new closure to be created.
612 static LClosure *getcached (Proto *p, UpVal **encup, StkId base) {
613 LClosure *c = p->cache;
614 if (c != NULL) { /* is there a cached closure? */
615 int nup = p->sizeupvalues;
616 Upvaldesc *uv = p->upvalues;
617 int i;
618 for (i = 0; i < nup; i++) { /* check whether it has right upvalues */
619 TValue *v = uv[i].instack ? base + uv[i].idx : encup[uv[i].idx]->v;
620 if (c->upvals[i]->v != v)
621 return NULL; /* wrong upvalue; cannot reuse closure */
624 return c; /* return cached closure (or NULL if no cached closure) */
629 ** create a new Lua closure, push it in the stack, and initialize
630 ** its upvalues. Note that the closure is not cached if prototype is
631 ** already black (which means that 'cache' was already cleared by the
632 ** GC).
634 static void pushclosure (lua_State *L, Proto *p, UpVal **encup, StkId base,
635 StkId ra) {
636 int nup = p->sizeupvalues;
637 Upvaldesc *uv = p->upvalues;
638 int i;
639 LClosure *ncl = luaF_newLclosure(L, nup);
640 ncl->p = p;
641 setclLvalue(L, ra, ncl); /* anchor new closure in stack */
642 for (i = 0; i < nup; i++) { /* fill in its upvalues */
643 if (uv[i].instack) /* upvalue refers to local variable? */
644 ncl->upvals[i] = luaF_findupval(L, base + uv[i].idx);
645 else /* get upvalue from enclosing function */
646 ncl->upvals[i] = encup[uv[i].idx];
647 ncl->upvals[i]->refcount++;
648 /* new closure is white, so we do not need a barrier here */
650 if (!isblack(p)) /* cache will not break GC invariant? */
651 p->cache = ncl; /* save it on cache for reuse */
656 ** finish execution of an opcode interrupted by an yield
658 void luaV_finishOp (lua_State *L) {
659 CallInfo *ci = L->ci;
660 StkId base = ci->u.l.base;
661 Instruction inst = *(ci->u.l.savedpc - 1); /* interrupted instruction */
662 OpCode op = GET_OPCODE(inst);
663 switch (op) { /* finish its execution */
664 #ifndef _KERNEL
665 case OP_ADD: case OP_SUB: case OP_MUL: case OP_DIV: case OP_IDIV:
666 #else
667 case OP_ADD: case OP_SUB: case OP_MUL: case OP_IDIV:
668 #endif
669 case OP_BAND: case OP_BOR: case OP_BXOR: case OP_SHL: case OP_SHR:
670 #ifndef _KERNEL
671 case OP_MOD: case OP_POW:
672 #else
673 case OP_MOD:
674 #endif
675 case OP_UNM: case OP_BNOT: case OP_LEN:
676 case OP_GETTABUP: case OP_GETTABLE: case OP_SELF: {
677 setobjs2s(L, base + GETARG_A(inst), --L->top);
678 break;
680 case OP_LE: case OP_LT: case OP_EQ: {
681 int res = !l_isfalse(L->top - 1);
682 L->top--;
683 if (ci->callstatus & CIST_LEQ) { /* "<=" using "<" instead? */
684 lua_assert(op == OP_LE);
685 ci->callstatus ^= CIST_LEQ; /* clear mark */
686 res = !res; /* negate result */
688 lua_assert(GET_OPCODE(*ci->u.l.savedpc) == OP_JMP);
689 if (res != GETARG_A(inst)) /* condition failed? */
690 ci->u.l.savedpc++; /* skip jump instruction */
691 break;
693 case OP_CONCAT: {
694 StkId top = L->top - 1; /* top when 'luaT_trybinTM' was called */
695 int b = GETARG_B(inst); /* first element to concatenate */
696 int total = cast_int(top - 1 - (base + b)); /* yet to concatenate */
697 setobj2s(L, top - 2, top); /* put TM result in proper position */
698 if (total > 1) { /* are there elements to concat? */
699 L->top = top - 1; /* top is one after last element (at top-2) */
700 luaV_concat(L, total); /* concat them (may yield again) */
702 /* move final result to final position */
703 setobj2s(L, ci->u.l.base + GETARG_A(inst), L->top - 1);
704 L->top = ci->top; /* restore top */
705 break;
707 case OP_TFORCALL: {
708 lua_assert(GET_OPCODE(*ci->u.l.savedpc) == OP_TFORLOOP);
709 L->top = ci->top; /* correct top */
710 break;
712 case OP_CALL: {
713 if (GETARG_C(inst) - 1 >= 0) /* nresults >= 0? */
714 L->top = ci->top; /* adjust results */
715 break;
717 case OP_TAILCALL: case OP_SETTABUP: case OP_SETTABLE:
718 break;
719 default: lua_assert(0);
727 ** {==================================================================
728 ** Function 'luaV_execute': main interpreter loop
729 ** ===================================================================
734 ** some macros for common tasks in 'luaV_execute'
737 #if !defined(luai_runtimecheck)
738 #define luai_runtimecheck(L, c) /* void */
739 #endif
742 #define RA(i) (base+GETARG_A(i))
743 /* to be used after possible stack reallocation */
744 #define RB(i) check_exp(getBMode(GET_OPCODE(i)) == OpArgR, base+GETARG_B(i))
745 #define RC(i) check_exp(getCMode(GET_OPCODE(i)) == OpArgR, base+GETARG_C(i))
746 #define RKB(i) check_exp(getBMode(GET_OPCODE(i)) == OpArgK, \
747 ISK(GETARG_B(i)) ? k+INDEXK(GETARG_B(i)) : base+GETARG_B(i))
748 #define RKC(i) check_exp(getCMode(GET_OPCODE(i)) == OpArgK, \
749 ISK(GETARG_C(i)) ? k+INDEXK(GETARG_C(i)) : base+GETARG_C(i))
750 #define KBx(i) \
751 (k + (GETARG_Bx(i) != 0 ? GETARG_Bx(i) - 1 : GETARG_Ax(*ci->u.l.savedpc++)))
754 /* execute a jump instruction */
755 #define dojump(ci,i,e) \
756 { int a = GETARG_A(i); \
757 if (a > 0) luaF_close(L, ci->u.l.base + a - 1); \
758 ci->u.l.savedpc += GETARG_sBx(i) + e; }
760 /* for test instructions, execute the jump instruction that follows it */
761 #define donextjump(ci) { i = *ci->u.l.savedpc; dojump(ci, i, 1); }
764 #define Protect(x) { {x;}; base = ci->u.l.base; }
766 #define checkGC(L,c) \
767 Protect( luaC_condGC(L,{L->top = (c); /* limit of live values */ \
768 luaC_step(L); \
769 L->top = ci->top;}) /* restore top */ \
770 luai_threadyield(L); )
773 #define vmdispatch(o) switch(o)
774 #define vmcase(l) case l:
775 #define vmbreak break
777 void luaV_execute (lua_State *L) {
778 CallInfo *ci = L->ci;
779 LClosure *cl;
780 TValue *k;
781 StkId base;
782 newframe: /* reentry point when frame changes (call/return) */
783 lua_assert(ci == L->ci);
784 cl = clLvalue(ci->func);
785 k = cl->p->k;
786 base = ci->u.l.base;
787 /* main loop of interpreter */
788 for (;;) {
789 Instruction i = *(ci->u.l.savedpc++);
790 StkId ra;
791 if ((L->hookmask & (LUA_MASKLINE | LUA_MASKCOUNT)) &&
792 (--L->hookcount == 0 || L->hookmask & LUA_MASKLINE)) {
793 Protect(luaG_traceexec(L));
795 /* WARNING: several calls may realloc the stack and invalidate 'ra' */
796 ra = RA(i);
797 lua_assert(base == ci->u.l.base);
798 lua_assert(base <= L->top && L->top < L->stack + L->stacksize);
799 vmdispatch (GET_OPCODE(i)) {
800 vmcase(OP_MOVE) {
801 setobjs2s(L, ra, RB(i));
802 vmbreak;
804 vmcase(OP_LOADK) {
805 TValue *rb = k + GETARG_Bx(i);
806 setobj2s(L, ra, rb);
807 vmbreak;
809 vmcase(OP_LOADKX) {
810 TValue *rb;
811 lua_assert(GET_OPCODE(*ci->u.l.savedpc) == OP_EXTRAARG);
812 rb = k + GETARG_Ax(*ci->u.l.savedpc++);
813 setobj2s(L, ra, rb);
814 vmbreak;
816 vmcase(OP_LOADBOOL) {
817 setbvalue(ra, GETARG_B(i));
818 if (GETARG_C(i)) ci->u.l.savedpc++; /* skip next instruction (if C) */
819 vmbreak;
821 vmcase(OP_LOADNIL) {
822 int b = GETARG_B(i);
823 do {
824 setnilvalue(ra++);
825 } while (b--);
826 vmbreak;
828 vmcase(OP_GETUPVAL) {
829 int b = GETARG_B(i);
830 setobj2s(L, ra, cl->upvals[b]->v);
831 vmbreak;
833 vmcase(OP_GETTABUP) {
834 int b = GETARG_B(i);
835 Protect(luaV_gettable(L, cl->upvals[b]->v, RKC(i), ra));
836 vmbreak;
838 vmcase(OP_GETTABLE) {
839 Protect(luaV_gettable(L, RB(i), RKC(i), ra));
840 vmbreak;
842 vmcase(OP_SETTABUP) {
843 int a = GETARG_A(i);
844 Protect(luaV_settable(L, cl->upvals[a]->v, RKB(i), RKC(i)));
845 vmbreak;
847 vmcase(OP_SETUPVAL) {
848 UpVal *uv = cl->upvals[GETARG_B(i)];
849 setobj(L, uv->v, ra);
850 luaC_upvalbarrier(L, uv);
851 vmbreak;
853 vmcase(OP_SETTABLE) {
854 Protect(luaV_settable(L, ra, RKB(i), RKC(i)));
855 vmbreak;
857 vmcase(OP_NEWTABLE) {
858 int b = GETARG_B(i);
859 int c = GETARG_C(i);
860 Table *t = luaH_new(L);
861 sethvalue(L, ra, t);
862 if (b != 0 || c != 0)
863 luaH_resize(L, t, luaO_fb2int(b), luaO_fb2int(c));
864 checkGC(L, ra + 1);
865 vmbreak;
867 vmcase(OP_SELF) {
868 StkId rb = RB(i);
869 setobjs2s(L, ra+1, rb);
870 Protect(luaV_gettable(L, rb, RKC(i), ra));
871 vmbreak;
873 vmcase(OP_ADD) {
874 TValue *rb = RKB(i);
875 TValue *rc = RKC(i);
876 #ifndef _KERNEL
877 lua_Number nb; lua_Number nc;
878 if (ttisinteger(rb) && ttisinteger(rc)) {
879 lua_Integer ib = ivalue(rb); lua_Integer ic = ivalue(rc);
880 setivalue(ra, intop(+, ib, ic));
882 else if (tonumber(rb, &nb) && tonumber(rc, &nc)) {
883 setfltvalue(ra, luai_numadd(L, nb, nc));
885 #else /* _KERNEL */
886 lua_Integer ib; lua_Integer ic;
887 if (tointeger(rb, &ib) && tointeger(rc, &ic)) {
888 setivalue(ra, intop(+, ib, ic));
890 #endif
891 else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_ADD)); }
892 vmbreak;
894 vmcase(OP_SUB) {
895 TValue *rb = RKB(i);
896 TValue *rc = RKC(i);
897 #ifndef _KERNEL
898 lua_Number nb; lua_Number nc;
899 if (ttisinteger(rb) && ttisinteger(rc)) {
900 lua_Integer ib = ivalue(rb); lua_Integer ic = ivalue(rc);
901 setivalue(ra, intop(-, ib, ic));
903 else if (tonumber(rb, &nb) && tonumber(rc, &nc)) {
904 setfltvalue(ra, luai_numsub(L, nb, nc));
906 #else /* _KERNEL */
907 lua_Integer ib; lua_Integer ic;
908 if (tointeger(rb, &ib) && tointeger(rc, &ic)) {
909 setivalue(ra, intop(-, ib, ic));
911 #endif
912 else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_SUB)); }
913 vmbreak;
915 vmcase(OP_MUL) {
916 TValue *rb = RKB(i);
917 TValue *rc = RKC(i);
918 #ifndef _KERNEL
919 lua_Number nb; lua_Number nc;
920 if (ttisinteger(rb) && ttisinteger(rc)) {
921 lua_Integer ib = ivalue(rb); lua_Integer ic = ivalue(rc);
922 setivalue(ra, intop(*, ib, ic));
924 else if (tonumber(rb, &nb) && tonumber(rc, &nc)) {
925 setfltvalue(ra, luai_nummul(L, nb, nc));
927 #else /* _KERNEL */
928 lua_Integer ib; lua_Integer ic;
929 if (tointeger(rb, &ib) && tointeger(rc, &ic)) {
930 setivalue(ra, intop(*, ib, ic));
932 #endif
933 else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_MUL)); }
934 vmbreak;
936 #ifndef _KERNEL
937 vmcase(OP_DIV) { /* float division (always with floats) */
938 TValue *rb = RKB(i);
939 TValue *rc = RKC(i);
940 lua_Number nb; lua_Number nc;
941 if (tonumber(rb, &nb) && tonumber(rc, &nc)) {
942 setfltvalue(ra, luai_numdiv(L, nb, nc));
944 else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_DIV)); }
945 vmbreak;
947 #endif
948 vmcase(OP_BAND) {
949 TValue *rb = RKB(i);
950 TValue *rc = RKC(i);
951 lua_Integer ib; lua_Integer ic;
952 if (tointeger(rb, &ib) && tointeger(rc, &ic)) {
953 setivalue(ra, intop(&, ib, ic));
955 else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_BAND)); }
956 vmbreak;
958 vmcase(OP_BOR) {
959 TValue *rb = RKB(i);
960 TValue *rc = RKC(i);
961 lua_Integer ib; lua_Integer ic;
962 if (tointeger(rb, &ib) && tointeger(rc, &ic)) {
963 setivalue(ra, intop(|, ib, ic));
965 else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_BOR)); }
966 vmbreak;
968 vmcase(OP_BXOR) {
969 TValue *rb = RKB(i);
970 TValue *rc = RKC(i);
971 lua_Integer ib; lua_Integer ic;
972 if (tointeger(rb, &ib) && tointeger(rc, &ic)) {
973 setivalue(ra, intop(^, ib, ic));
975 else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_BXOR)); }
976 vmbreak;
978 vmcase(OP_SHL) {
979 TValue *rb = RKB(i);
980 TValue *rc = RKC(i);
981 lua_Integer ib; lua_Integer ic;
982 if (tointeger(rb, &ib) && tointeger(rc, &ic)) {
983 setivalue(ra, luaV_shiftl(ib, ic));
985 else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_SHL)); }
986 vmbreak;
988 vmcase(OP_SHR) {
989 TValue *rb = RKB(i);
990 TValue *rc = RKC(i);
991 lua_Integer ib; lua_Integer ic;
992 if (tointeger(rb, &ib) && tointeger(rc, &ic)) {
993 setivalue(ra, luaV_shiftl(ib, -ic));
995 else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_SHR)); }
996 vmbreak;
998 vmcase(OP_MOD) {
999 TValue *rb = RKB(i);
1000 TValue *rc = RKC(i);
1001 #ifndef _KERNEL
1002 lua_Number nb; lua_Number nc;
1003 if (ttisinteger(rb) && ttisinteger(rc)) {
1004 lua_Integer ib = ivalue(rb); lua_Integer ic = ivalue(rc);
1005 setivalue(ra, luaV_mod(L, ib, ic));
1007 else if (tonumber(rb, &nb) && tonumber(rc, &nc)) {
1008 lua_Number m;
1009 luai_nummod(L, nb, nc, m);
1010 setfltvalue(ra, m);
1012 #else /* _KERNEL */
1013 lua_Integer ib; lua_Integer ic;
1014 if (tointeger(rb, &ib) && tointeger(rc, &ic)) {
1015 setivalue(ra, luaV_mod(L, ib, ic));
1017 #endif
1018 else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_MOD)); }
1019 vmbreak;
1021 vmcase(OP_IDIV) { /* floor division */
1022 TValue *rb = RKB(i);
1023 TValue *rc = RKC(i);
1024 #ifndef _KERNEL
1025 lua_Number nb; lua_Number nc;
1026 if (ttisinteger(rb) && ttisinteger(rc)) {
1027 lua_Integer ib = ivalue(rb); lua_Integer ic = ivalue(rc);
1028 setivalue(ra, luaV_div(L, ib, ic));
1030 else if (tonumber(rb, &nb) && tonumber(rc, &nc)) {
1031 setfltvalue(ra, luai_numidiv(L, nb, nc));
1033 #else /* _KERNEL */
1034 lua_Integer ib; lua_Integer ic;
1035 if (tointeger(rb, &ib) && tointeger(rc, &ic)) {
1036 setivalue(ra, luaV_div(L, ib, ic));
1038 #endif
1039 else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_IDIV)); }
1040 vmbreak;
1042 #ifndef _KERNEL
1043 vmcase(OP_POW) {
1044 TValue *rb = RKB(i);
1045 TValue *rc = RKC(i);
1046 lua_Number nb; lua_Number nc;
1047 if (tonumber(rb, &nb) && tonumber(rc, &nc)) {
1048 setfltvalue(ra, luai_numpow(L, nb, nc));
1050 else { Protect(luaT_trybinTM(L, rb, rc, ra, TM_POW)); }
1051 vmbreak;
1053 #endif
1054 vmcase(OP_UNM) {
1055 TValue *rb = RB(i);
1056 #ifndef _KERNEL
1057 lua_Number nb;
1058 if (ttisinteger(rb)) {
1059 lua_Integer ib = ivalue(rb);
1060 setivalue(ra, intop(-, 0, ib));
1062 else if (tonumber(rb, &nb)) {
1063 setfltvalue(ra, luai_numunm(L, nb));
1065 #else /* _KERNEL */
1066 lua_Integer ib;
1067 if (tointeger(rb, &ib)) {
1068 setivalue(ra, intop(-, 0, ib));
1070 #endif
1071 else {
1072 Protect(luaT_trybinTM(L, rb, rb, ra, TM_UNM));
1074 vmbreak;
1076 vmcase(OP_BNOT) {
1077 TValue *rb = RB(i);
1078 lua_Integer ib;
1079 if (tointeger(rb, &ib)) {
1080 setivalue(ra, intop(^, ~l_castS2U(0), ib));
1082 else {
1083 Protect(luaT_trybinTM(L, rb, rb, ra, TM_BNOT));
1085 vmbreak;
1087 vmcase(OP_NOT) {
1088 TValue *rb = RB(i);
1089 int res = l_isfalse(rb); /* next assignment may change this value */
1090 setbvalue(ra, res);
1091 vmbreak;
1093 vmcase(OP_LEN) {
1094 Protect(luaV_objlen(L, ra, RB(i)));
1095 vmbreak;
1097 vmcase(OP_CONCAT) {
1098 int b = GETARG_B(i);
1099 int c = GETARG_C(i);
1100 StkId rb;
1101 L->top = base + c + 1; /* mark the end of concat operands */
1102 Protect(luaV_concat(L, c - b + 1));
1103 ra = RA(i); /* 'luav_concat' may invoke TMs and move the stack */
1104 rb = base + b;
1105 setobjs2s(L, ra, rb);
1106 checkGC(L, (ra >= rb ? ra + 1 : rb));
1107 L->top = ci->top; /* restore top */
1108 vmbreak;
1110 vmcase(OP_JMP) {
1111 dojump(ci, i, 0);
1112 vmbreak;
1114 vmcase(OP_EQ) {
1115 TValue *rb = RKB(i);
1116 TValue *rc = RKC(i);
1117 Protect(
1118 if (cast_int(luaV_equalobj(L, rb, rc)) != GETARG_A(i))
1119 ci->u.l.savedpc++;
1120 else
1121 donextjump(ci);
1123 vmbreak;
1125 vmcase(OP_LT) {
1126 Protect(
1127 if (luaV_lessthan(L, RKB(i), RKC(i)) != GETARG_A(i))
1128 ci->u.l.savedpc++;
1129 else
1130 donextjump(ci);
1132 vmbreak;
1134 vmcase(OP_LE) {
1135 Protect(
1136 if (luaV_lessequal(L, RKB(i), RKC(i)) != GETARG_A(i))
1137 ci->u.l.savedpc++;
1138 else
1139 donextjump(ci);
1141 vmbreak;
1143 vmcase(OP_TEST) {
1144 if (GETARG_C(i) ? l_isfalse(ra) : !l_isfalse(ra))
1145 ci->u.l.savedpc++;
1146 else
1147 donextjump(ci);
1148 vmbreak;
1150 vmcase(OP_TESTSET) {
1151 TValue *rb = RB(i);
1152 if (GETARG_C(i) ? l_isfalse(rb) : !l_isfalse(rb))
1153 ci->u.l.savedpc++;
1154 else {
1155 setobjs2s(L, ra, rb);
1156 donextjump(ci);
1158 vmbreak;
1160 vmcase(OP_CALL) {
1161 int b = GETARG_B(i);
1162 int nresults = GETARG_C(i) - 1;
1163 if (b != 0) L->top = ra+b; /* else previous instruction set top */
1164 if (luaD_precall(L, ra, nresults)) { /* C function? */
1165 if (nresults >= 0) L->top = ci->top; /* adjust results */
1166 base = ci->u.l.base;
1168 else { /* Lua function */
1169 ci = L->ci;
1170 ci->callstatus |= CIST_REENTRY;
1171 goto newframe; /* restart luaV_execute over new Lua function */
1173 vmbreak;
1175 vmcase(OP_TAILCALL) {
1176 int b = GETARG_B(i);
1177 if (b != 0) L->top = ra+b; /* else previous instruction set top */
1178 lua_assert(GETARG_C(i) - 1 == LUA_MULTRET);
1179 if (luaD_precall(L, ra, LUA_MULTRET)) /* C function? */
1180 base = ci->u.l.base;
1181 else {
1182 /* tail call: put called frame (n) in place of caller one (o) */
1183 CallInfo *nci = L->ci; /* called frame */
1184 CallInfo *oci = nci->previous; /* caller frame */
1185 StkId nfunc = nci->func; /* called function */
1186 StkId ofunc = oci->func; /* caller function */
1187 /* last stack slot filled by 'precall' */
1188 StkId lim = nci->u.l.base + getproto(nfunc)->numparams;
1189 int aux;
1190 /* close all upvalues from previous call */
1191 if (cl->p->sizep > 0) luaF_close(L, oci->u.l.base);
1192 /* move new frame into old one */
1193 for (aux = 0; nfunc + aux < lim; aux++)
1194 setobjs2s(L, ofunc + aux, nfunc + aux);
1195 oci->u.l.base = ofunc + (nci->u.l.base - nfunc); /* correct base */
1196 oci->top = L->top = ofunc + (L->top - nfunc); /* correct top */
1197 oci->u.l.savedpc = nci->u.l.savedpc;
1198 oci->callstatus |= CIST_TAIL; /* function was tail called */
1199 ci = L->ci = oci; /* remove new frame */
1200 lua_assert(L->top == oci->u.l.base + getproto(ofunc)->maxstacksize);
1201 goto newframe; /* restart luaV_execute over new Lua function */
1203 vmbreak;
1205 vmcase(OP_RETURN) {
1206 int b = GETARG_B(i);
1207 if (cl->p->sizep > 0) luaF_close(L, base);
1208 b = luaD_poscall(L, ra, (b != 0 ? b - 1 : L->top - ra));
1209 if (!(ci->callstatus & CIST_REENTRY)) /* 'ci' still the called one */
1210 return; /* external invocation: return */
1211 else { /* invocation via reentry: continue execution */
1212 ci = L->ci;
1213 if (b) L->top = ci->top;
1214 lua_assert(isLua(ci));
1215 lua_assert(GET_OPCODE(*((ci)->u.l.savedpc - 1)) == OP_CALL);
1216 goto newframe; /* restart luaV_execute over new Lua function */
1219 vmcase(OP_FORLOOP) {
1220 #ifndef _KERNEL
1221 if (ttisinteger(ra)) { /* integer loop? */
1222 #endif
1223 lua_Integer step = ivalue(ra + 2);
1224 lua_Integer idx = ivalue(ra) + step; /* increment index */
1225 lua_Integer limit = ivalue(ra + 1);
1226 if ((0 < step) ? (idx <= limit) : (limit <= idx)) {
1227 ci->u.l.savedpc += GETARG_sBx(i); /* jump back */
1228 chgivalue(ra, idx); /* update internal index... */
1229 setivalue(ra + 3, idx); /* ...and external index */
1231 #ifndef _KERNEL
1233 else { /* floating loop */
1234 lua_Number step = fltvalue(ra + 2);
1235 lua_Number idx = luai_numadd(L, fltvalue(ra), step); /* inc. index */
1236 lua_Number limit = fltvalue(ra + 1);
1237 if (luai_numlt(0, step) ? luai_numle(idx, limit)
1238 : luai_numle(limit, idx)) {
1239 ci->u.l.savedpc += GETARG_sBx(i); /* jump back */
1240 chgfltvalue(ra, idx); /* update internal index... */
1241 setfltvalue(ra + 3, idx); /* ...and external index */
1244 #endif
1245 vmbreak;
1247 vmcase(OP_FORPREP) {
1248 TValue *init = ra;
1249 TValue *plimit = ra + 1;
1250 TValue *pstep = ra + 2;
1251 lua_Integer ilimit;
1252 #ifndef _KERNEL
1253 int stopnow;
1254 if (ttisinteger(init) && ttisinteger(pstep) &&
1255 forlimit(plimit, &ilimit, ivalue(pstep), &stopnow)) {
1256 /* all values are integer */
1257 lua_Integer initv = (stopnow ? 0 : ivalue(init));
1258 setivalue(plimit, ilimit);
1259 setivalue(init, initv - ivalue(pstep));
1261 else { /* try making all values floats */
1262 lua_Number ninit; lua_Number nlimit; lua_Number nstep;
1263 if (!tonumber(plimit, &nlimit))
1264 luaG_runerror(L, "'for' limit must be a number");
1265 setfltvalue(plimit, nlimit);
1266 if (!tonumber(pstep, &nstep))
1267 luaG_runerror(L, "'for' step must be a number");
1268 setfltvalue(pstep, nstep);
1269 if (!tonumber(init, &ninit))
1270 luaG_runerror(L, "'for' initial value must be a number");
1271 setfltvalue(init, luai_numsub(L, ninit, nstep));
1273 #else /* _KERNEL */
1274 lua_Integer initv; lua_Integer step;
1275 if (!tointeger(plimit, &ilimit))
1276 luaG_runerror(L, "'for' limit must be a number");
1277 setivalue(plimit, ilimit);
1278 if (!tointeger(pstep, &step))
1279 luaG_runerror(L, "'for' step must be a number");
1280 setivalue(pstep, step);
1281 if (!tointeger(init, &initv))
1282 luaG_runerror(L, "'for' initial value must be a number");
1283 setivalue(init, initv - step);
1284 #endif
1285 ci->u.l.savedpc += GETARG_sBx(i);
1286 vmbreak;
1288 vmcase(OP_TFORCALL) {
1289 StkId cb = ra + 3; /* call base */
1290 setobjs2s(L, cb+2, ra+2);
1291 setobjs2s(L, cb+1, ra+1);
1292 setobjs2s(L, cb, ra);
1293 L->top = cb + 3; /* func. + 2 args (state and index) */
1294 Protect(luaD_call(L, cb, GETARG_C(i), 1));
1295 L->top = ci->top;
1296 i = *(ci->u.l.savedpc++); /* go to next instruction */
1297 ra = RA(i);
1298 lua_assert(GET_OPCODE(i) == OP_TFORLOOP);
1299 goto l_tforloop;
1301 vmcase(OP_TFORLOOP) {
1302 l_tforloop:
1303 if (!ttisnil(ra + 1)) { /* continue loop? */
1304 setobjs2s(L, ra, ra + 1); /* save control variable */
1305 ci->u.l.savedpc += GETARG_sBx(i); /* jump back */
1307 vmbreak;
1309 vmcase(OP_SETLIST) {
1310 int n = GETARG_B(i);
1311 int c = GETARG_C(i);
1312 unsigned int last;
1313 Table *h;
1314 if (n == 0) n = cast_int(L->top - ra) - 1;
1315 if (c == 0) {
1316 lua_assert(GET_OPCODE(*ci->u.l.savedpc) == OP_EXTRAARG);
1317 c = GETARG_Ax(*ci->u.l.savedpc++);
1319 luai_runtimecheck(L, ttistable(ra));
1320 h = hvalue(ra);
1321 last = ((c-1)*LFIELDS_PER_FLUSH) + n;
1322 if (last > h->sizearray) /* needs more space? */
1323 luaH_resizearray(L, h, last); /* pre-allocate it at once */
1324 for (; n > 0; n--) {
1325 TValue *val = ra+n;
1326 luaH_setint(L, h, last--, val);
1327 luaC_barrierback(L, h, val);
1329 L->top = ci->top; /* correct top (in case of previous open call) */
1330 vmbreak;
1332 vmcase(OP_CLOSURE) {
1333 Proto *p = cl->p->p[GETARG_Bx(i)];
1334 LClosure *ncl = getcached(p, cl->upvals, base); /* cached closure */
1335 if (ncl == NULL) /* no match? */
1336 pushclosure(L, p, cl->upvals, base, ra); /* create a new one */
1337 else
1338 setclLvalue(L, ra, ncl); /* push cashed closure */
1339 checkGC(L, ra + 1);
1340 vmbreak;
1342 vmcase(OP_VARARG) {
1343 int b = GETARG_B(i) - 1;
1344 int j;
1345 int n = cast_int(base - ci->func) - cl->p->numparams - 1;
1346 if (b < 0) { /* B == 0? */
1347 b = n; /* get all var. arguments */
1348 Protect(luaD_checkstack(L, n));
1349 ra = RA(i); /* previous call may change the stack */
1350 L->top = ra + n;
1352 for (j = 0; j < b; j++) {
1353 if (j < n) {
1354 setobjs2s(L, ra + j, base - n + j);
1356 else {
1357 setnilvalue(ra + j);
1360 vmbreak;
1362 vmcase(OP_EXTRAARG) {
1363 lua_assert(0);
1364 vmbreak;
1370 /* }================================================================== */