2
** $Id: lapi.c,v 2.55.1.5 2008/07/04 18:41:18 roberto Exp $
4
** See Copyright Notice in lua.h
35
const char lua_ident[] =
36
"$Lua: " LUA_RELEASE " " LUA_COPYRIGHT " $\n"
37
"$Authors: " LUA_AUTHORS " $\n"
38
"$URL: www.lua.org $\n";
42
#define api_checknelems(L, n) api_check(L, (n) <= (L->top - L->base))
44
#define api_checkvalidindex(L, i) api_check(L, (i) != luaO_nilobject)
46
#define api_incr_top(L) {api_check(L, L->top < L->ci->top); L->top++;}
50
static TValue *index2adr (lua_State *L, int idx) {
52
TValue *o = L->base + (idx - 1);
53
api_check(L, idx <= L->ci->top - L->base);
54
if (o >= L->top) return cast(TValue *, luaO_nilobject);
57
else if (idx > LUA_REGISTRYINDEX) {
58
api_check(L, idx != 0 && -idx <= L->top - L->base);
61
else switch (idx) { /* pseudo-indices */
62
case LUA_REGISTRYINDEX: return registry(L);
63
case LUA_ENVIRONINDEX: {
64
Closure *func = curr_func(L);
65
sethvalue(L, &L->env, func->c.env);
68
case LUA_GLOBALSINDEX: return gt(L);
70
Closure *func = curr_func(L);
71
idx = LUA_GLOBALSINDEX - idx;
72
return (idx <= func->c.nupvalues)
73
? &func->c.upvalue[idx-1]
74
: cast(TValue *, luaO_nilobject);
80
static Table *getcurrenv (lua_State *L) {
81
if (L->ci == L->base_ci) /* no enclosing function? */
82
return hvalue(gt(L)); /* use global table as environment */
84
Closure *func = curr_func(L);
90
void luaA_pushobject (lua_State *L, const TValue *o) {
91
setobj2s(L, L->top, o);
96
LUA_API int lua_checkstack (lua_State *L, int size) {
99
if (size > LUAI_MAXCSTACK || (L->top - L->base + size) > LUAI_MAXCSTACK)
100
res = 0; /* stack overflow */
102
luaD_checkstack(L, size);
103
if (L->ci->top < L->top + size)
104
L->ci->top = L->top + size;
111
LUA_API void lua_xmove (lua_State *from, lua_State *to, int n) {
113
if (from == to) return;
115
api_checknelems(from, n);
116
api_check(from, G(from) == G(to));
117
api_check(from, to->ci->top - to->top >= n);
119
for (i = 0; i < n; i++) {
120
setobj2s(to, to->top++, from->top + i);
126
LUA_API void lua_setlevel (lua_State *from, lua_State *to) {
127
to->nCcalls = from->nCcalls;
131
LUA_API lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf) {
135
G(L)->panic = panicf;
141
LUA_API lua_State *lua_newthread (lua_State *L) {
145
L1 = luaE_newthread(L);
146
setthvalue(L, L->top, L1);
149
luai_userstatethread(L, L1);
156
** basic stack manipulation
160
LUA_API int lua_gettop (lua_State *L) {
161
return cast_int(L->top - L->base);
165
LUA_API void lua_settop (lua_State *L, int idx) {
168
api_check(L, idx <= L->stack_last - L->base);
169
while (L->top < L->base + idx)
170
setnilvalue(L->top++);
171
L->top = L->base + idx;
174
api_check(L, -(idx+1) <= (L->top - L->base));
175
L->top += idx+1; /* `subtract' index (index is negative) */
181
LUA_API void lua_remove (lua_State *L, int idx) {
184
p = index2adr(L, idx);
185
api_checkvalidindex(L, p);
186
while (++p < L->top) setobjs2s(L, p-1, p);
192
LUA_API void lua_insert (lua_State *L, int idx) {
196
p = index2adr(L, idx);
197
api_checkvalidindex(L, p);
198
for (q = L->top; q>p; q--) setobjs2s(L, q, q-1);
199
setobjs2s(L, p, L->top);
204
LUA_API void lua_replace (lua_State *L, int idx) {
207
/* explicit test for incompatible code */
208
if (idx == LUA_ENVIRONINDEX && L->ci == L->base_ci)
209
luaG_runerror(L, "no calling environment");
210
api_checknelems(L, 1);
211
o = index2adr(L, idx);
212
api_checkvalidindex(L, o);
213
if (idx == LUA_ENVIRONINDEX) {
214
Closure *func = curr_func(L);
215
api_check(L, ttistable(L->top - 1));
216
func->c.env = hvalue(L->top - 1);
217
luaC_barrier(L, func, L->top - 1);
220
setobj(L, o, L->top - 1);
221
if (idx < LUA_GLOBALSINDEX) /* function upvalue? */
222
luaC_barrier(L, curr_func(L), L->top - 1);
229
LUA_API void lua_pushvalue (lua_State *L, int idx) {
231
setobj2s(L, L->top, index2adr(L, idx));
239
** access functions (stack -> C)
243
LUA_API int lua_type (lua_State *L, int idx) {
244
StkId o = index2adr(L, idx);
245
return (o == luaO_nilobject) ? LUA_TNONE : ttype(o);
249
LUA_API const char *lua_typename (lua_State *L, int t) {
251
return (t == LUA_TNONE) ? "no value" : luaT_typenames[t];
255
LUA_API int lua_iscfunction (lua_State *L, int idx) {
256
StkId o = index2adr(L, idx);
257
return iscfunction(o);
261
LUA_API int lua_isnumber (lua_State *L, int idx) {
263
const TValue *o = index2adr(L, idx);
264
return tonumber(o, &n);
268
LUA_API int lua_isstring (lua_State *L, int idx) {
269
int t = lua_type(L, idx);
270
return (t == LUA_TSTRING || t == LUA_TNUMBER);
274
LUA_API int lua_isuserdata (lua_State *L, int idx) {
275
const TValue *o = index2adr(L, idx);
276
return (ttisuserdata(o) || ttislightuserdata(o));
280
LUA_API int lua_rawequal (lua_State *L, int index1, int index2) {
281
StkId o1 = index2adr(L, index1);
282
StkId o2 = index2adr(L, index2);
283
return (o1 == luaO_nilobject || o2 == luaO_nilobject) ? 0
284
: luaO_rawequalObj(o1, o2);
288
LUA_API int lua_equal (lua_State *L, int index1, int index2) {
291
lua_lock(L); /* may call tag method */
292
o1 = index2adr(L, index1);
293
o2 = index2adr(L, index2);
294
i = (o1 == luaO_nilobject || o2 == luaO_nilobject) ? 0 : equalobj(L, o1, o2);
300
LUA_API int lua_lessthan (lua_State *L, int index1, int index2) {
303
lua_lock(L); /* may call tag method */
304
o1 = index2adr(L, index1);
305
o2 = index2adr(L, index2);
306
i = (o1 == luaO_nilobject || o2 == luaO_nilobject) ? 0
307
: luaV_lessthan(L, o1, o2);
314
LUA_API lua_Number lua_tonumber (lua_State *L, int idx) {
316
const TValue *o = index2adr(L, idx);
324
LUA_API lua_Integer lua_tointeger (lua_State *L, int idx) {
326
const TValue *o = index2adr(L, idx);
327
if (tonumber(o, &n)) {
329
lua_Number num = nvalue(o);
330
lua_number2integer(res, num);
338
LUA_API int lua_toboolean (lua_State *L, int idx) {
339
const TValue *o = index2adr(L, idx);
340
return !l_isfalse(o);
344
LUA_API const char *lua_tolstring (lua_State *L, int idx, size_t *len) {
345
StkId o = index2adr(L, idx);
346
if (!ttisstring(o)) {
347
lua_lock(L); /* `luaV_tostring' may create a new string */
348
if (!luaV_tostring(L, o)) { /* conversion failed? */
349
if (len != NULL) *len = 0;
354
o = index2adr(L, idx); /* previous call may reallocate the stack */
357
if (len != NULL) *len = tsvalue(o)->len;
362
LUA_API size_t lua_objlen (lua_State *L, int idx) {
363
StkId o = index2adr(L, idx);
365
case LUA_TSTRING: return tsvalue(o)->len;
366
case LUA_TUSERDATA: return uvalue(o)->len;
367
case LUA_TTABLE: return luaH_getn(hvalue(o));
370
lua_lock(L); /* `luaV_tostring' may create a new string */
371
l = (luaV_tostring(L, o) ? tsvalue(o)->len : 0);
380
LUA_API lua_CFunction lua_tocfunction (lua_State *L, int idx) {
381
StkId o = index2adr(L, idx);
382
return (!iscfunction(o)) ? NULL : clvalue(o)->c.f;
386
LUA_API void *lua_touserdata (lua_State *L, int idx) {
387
StkId o = index2adr(L, idx);
389
case LUA_TUSERDATA: return (rawuvalue(o) + 1);
390
case LUA_TLIGHTUSERDATA: return pvalue(o);
391
default: return NULL;
396
LUA_API lua_State *lua_tothread (lua_State *L, int idx) {
397
StkId o = index2adr(L, idx);
398
return (!ttisthread(o)) ? NULL : thvalue(o);
402
LUA_API const void *lua_topointer (lua_State *L, int idx) {
403
StkId o = index2adr(L, idx);
405
case LUA_TTABLE: return hvalue(o);
406
case LUA_TFUNCTION: return clvalue(o);
407
case LUA_TTHREAD: return thvalue(o);
409
case LUA_TLIGHTUSERDATA:
410
return lua_touserdata(L, idx);
411
default: return NULL;
418
** push functions (C -> stack)
422
LUA_API void lua_pushnil (lua_State *L) {
430
LUA_API void lua_pushnumber (lua_State *L, lua_Number n) {
432
setnvalue(L->top, n);
438
LUA_API void lua_pushinteger (lua_State *L, lua_Integer n) {
440
setnvalue(L->top, cast_num(n));
446
LUA_API void lua_pushlstring (lua_State *L, const char *s, size_t len) {
449
setsvalue2s(L, L->top, luaS_newlstr(L, s, len));
455
LUA_API void lua_pushstring (lua_State *L, const char *s) {
459
lua_pushlstring(L, s, strlen(s));
463
LUA_API const char *lua_pushvfstring (lua_State *L, const char *fmt,
468
ret = luaO_pushvfstring(L, fmt, argp);
474
LUA_API const char *lua_pushfstring (lua_State *L, const char *fmt, ...) {
480
ret = luaO_pushvfstring(L, fmt, argp);
487
LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {
491
api_checknelems(L, n);
492
cl = luaF_newCclosure(L, n, getcurrenv(L));
496
setobj2n(L, &cl->c.upvalue[n], L->top+n);
497
setclvalue(L, L->top, cl);
498
lua_assert(iswhite(obj2gco(cl)));
504
LUA_API void lua_pushboolean (lua_State *L, int b) {
506
setbvalue(L->top, (b != 0)); /* ensure that true is 1 */
512
LUA_API void lua_pushlightuserdata (lua_State *L, void *p) {
514
setpvalue(L->top, p);
520
LUA_API int lua_pushthread (lua_State *L) {
522
setthvalue(L, L->top, L);
525
return (G(L)->mainthread == L);
531
** get functions (Lua -> stack)
535
LUA_API void lua_gettable (lua_State *L, int idx) {
538
t = index2adr(L, idx);
539
api_checkvalidindex(L, t);
540
luaV_gettable(L, t, L->top - 1, L->top - 1);
545
LUA_API void lua_getfield (lua_State *L, int idx, const char *k) {
549
t = index2adr(L, idx);
550
api_checkvalidindex(L, t);
551
setsvalue(L, &key, luaS_new(L, k));
552
luaV_gettable(L, t, &key, L->top);
558
LUA_API void lua_rawget (lua_State *L, int idx) {
561
t = index2adr(L, idx);
562
api_check(L, ttistable(t));
563
setobj2s(L, L->top - 1, luaH_get(hvalue(t), L->top - 1));
568
LUA_API void lua_rawgeti (lua_State *L, int idx, int n) {
571
o = index2adr(L, idx);
572
api_check(L, ttistable(o));
573
setobj2s(L, L->top, luaH_getnum(hvalue(o), n));
579
LUA_API void lua_createtable (lua_State *L, int narray, int nrec) {
582
sethvalue(L, L->top, luaH_new(L, narray, nrec));
588
LUA_API int lua_getmetatable (lua_State *L, int objindex) {
593
obj = index2adr(L, objindex);
594
switch (ttype(obj)) {
596
mt = hvalue(obj)->metatable;
599
mt = uvalue(obj)->metatable;
602
mt = G(L)->mt[ttype(obj)];
608
sethvalue(L, L->top, mt);
617
LUA_API void lua_getfenv (lua_State *L, int idx) {
620
o = index2adr(L, idx);
621
api_checkvalidindex(L, o);
624
sethvalue(L, L->top, clvalue(o)->c.env);
627
sethvalue(L, L->top, uvalue(o)->env);
630
setobj2s(L, L->top, gt(thvalue(o)));
642
** set functions (stack -> Lua)
646
LUA_API void lua_settable (lua_State *L, int idx) {
649
api_checknelems(L, 2);
650
t = index2adr(L, idx);
651
api_checkvalidindex(L, t);
652
luaV_settable(L, t, L->top - 2, L->top - 1);
653
L->top -= 2; /* pop index and value */
658
LUA_API void lua_setfield (lua_State *L, int idx, const char *k) {
662
api_checknelems(L, 1);
663
t = index2adr(L, idx);
664
api_checkvalidindex(L, t);
665
setsvalue(L, &key, luaS_new(L, k));
666
luaV_settable(L, t, &key, L->top - 1);
667
L->top--; /* pop value */
672
LUA_API void lua_rawset (lua_State *L, int idx) {
675
api_checknelems(L, 2);
676
t = index2adr(L, idx);
677
api_check(L, ttistable(t));
678
setobj2t(L, luaH_set(L, hvalue(t), L->top-2), L->top-1);
679
luaC_barriert(L, hvalue(t), L->top-1);
685
LUA_API void lua_rawseti (lua_State *L, int idx, int n) {
688
api_checknelems(L, 1);
689
o = index2adr(L, idx);
690
api_check(L, ttistable(o));
691
setobj2t(L, luaH_setnum(L, hvalue(o), n), L->top-1);
692
luaC_barriert(L, hvalue(o), L->top-1);
698
LUA_API int lua_setmetatable (lua_State *L, int objindex) {
702
api_checknelems(L, 1);
703
obj = index2adr(L, objindex);
704
api_checkvalidindex(L, obj);
705
if (ttisnil(L->top - 1))
708
api_check(L, ttistable(L->top - 1));
709
mt = hvalue(L->top - 1);
711
switch (ttype(obj)) {
713
hvalue(obj)->metatable = mt;
715
luaC_objbarriert(L, hvalue(obj), mt);
718
case LUA_TUSERDATA: {
719
uvalue(obj)->metatable = mt;
721
luaC_objbarrier(L, rawuvalue(obj), mt);
725
G(L)->mt[ttype(obj)] = mt;
735
LUA_API int lua_setfenv (lua_State *L, int idx) {
739
api_checknelems(L, 1);
740
o = index2adr(L, idx);
741
api_checkvalidindex(L, o);
742
api_check(L, ttistable(L->top - 1));
745
clvalue(o)->c.env = hvalue(L->top - 1);
748
uvalue(o)->env = hvalue(L->top - 1);
751
sethvalue(L, gt(thvalue(o)), hvalue(L->top - 1));
757
if (res) luaC_objbarrier(L, gcvalue(o), hvalue(L->top - 1));
765
** `load' and `call' functions (run Lua code)
769
#define adjustresults(L,nres) \
770
{ if (nres == LUA_MULTRET && L->top >= L->ci->top) L->ci->top = L->top; }
773
#define checkresults(L,na,nr) \
774
api_check(L, (nr) == LUA_MULTRET || (L->ci->top - L->top >= (nr) - (na)))
777
LUA_API void lua_call (lua_State *L, int nargs, int nresults) {
780
api_checknelems(L, nargs+1);
781
checkresults(L, nargs, nresults);
782
func = L->top - (nargs+1);
783
luaD_call(L, func, nresults);
784
adjustresults(L, nresults);
791
** Execute a protected call.
793
struct CallS { /* data to `f_call' */
799
static void f_call (lua_State *L, void *ud) {
800
struct CallS *c = cast(struct CallS *, ud);
801
luaD_call(L, c->func, c->nresults);
806
LUA_API int lua_pcall (lua_State *L, int nargs, int nresults, int errfunc) {
811
api_checknelems(L, nargs+1);
812
checkresults(L, nargs, nresults);
816
StkId o = index2adr(L, errfunc);
817
api_checkvalidindex(L, o);
818
func = savestack(L, o);
820
c.func = L->top - (nargs+1); /* function to be called */
821
c.nresults = nresults;
822
status = luaD_pcall(L, f_call, &c, savestack(L, c.func), func);
823
adjustresults(L, nresults);
830
** Execute a protected C call.
832
struct CCallS { /* data to `f_Ccall' */
838
static void f_Ccall (lua_State *L, void *ud) {
839
struct CCallS *c = cast(struct CCallS *, ud);
841
cl = luaF_newCclosure(L, 0, getcurrenv(L));
843
setclvalue(L, L->top, cl); /* push function */
845
setpvalue(L->top, c->ud); /* push only argument */
847
luaD_call(L, L->top - 2, 0);
851
LUA_API int lua_cpcall (lua_State *L, lua_CFunction func, void *ud) {
857
status = luaD_pcall(L, f_Ccall, &c, savestack(L, L->top), 0);
863
LUA_API int lua_load (lua_State *L, lua_Reader reader, void *data,
864
const char *chunkname) {
868
if (!chunkname) chunkname = "?";
869
luaZ_init(L, &z, reader, data);
870
status = luaD_protectedparser(L, &z, chunkname);
876
LUA_API int lua_dump (lua_State *L, lua_Writer writer, void *data) {
880
api_checknelems(L, 1);
883
status = luaU_dump(L, clvalue(o)->l.p, writer, data, 0);
891
LUA_API int lua_status (lua_State *L) {
897
** Garbage-collection function
900
LUA_API int lua_gc (lua_State *L, int what, int data) {
907
g->GCthreshold = MAX_LUMEM;
910
case LUA_GCRESTART: {
911
g->GCthreshold = g->totalbytes;
914
case LUA_GCCOLLECT: {
919
/* GC values are expressed in Kbytes: #bytes/2^10 */
920
res = cast_int(g->totalbytes >> 10);
924
res = cast_int(g->totalbytes & 0x3ff);
928
lu_mem a = (cast(lu_mem, data) << 10);
929
if (a <= g->totalbytes)
930
g->GCthreshold = g->totalbytes - a;
933
while (g->GCthreshold <= g->totalbytes) {
935
if (g->gcstate == GCSpause) { /* end of cycle? */
936
res = 1; /* signal it */
942
case LUA_GCSETPAUSE: {
947
case LUA_GCSETSTEPMUL: {
952
default: res = -1; /* invalid option */
961
** miscellaneous functions
965
LUA_API int lua_error (lua_State *L) {
967
api_checknelems(L, 1);
970
return 0; /* to avoid warnings */
974
LUA_API int lua_next (lua_State *L, int idx) {
978
t = index2adr(L, idx);
979
api_check(L, ttistable(t));
980
more = luaH_next(L, hvalue(t), L->top - 1);
984
else /* no more elements */
985
L->top -= 1; /* remove key */
991
LUA_API void lua_concat (lua_State *L, int n) {
993
api_checknelems(L, n);
996
luaV_concat(L, n, cast_int(L->top - L->base) - 1);
999
else if (n == 0) { /* push empty string */
1000
setsvalue2s(L, L->top, luaS_newlstr(L, "", 0));
1003
/* else n == 1; nothing to do */
1008
LUA_API lua_Alloc lua_getallocf (lua_State *L, void **ud) {
1011
if (ud) *ud = G(L)->ud;
1018
LUA_API void lua_setallocf (lua_State *L, lua_Alloc f, void *ud) {
1026
LUA_API void *lua_newuserdata (lua_State *L, size_t size) {
1030
u = luaS_newudata(L, size, getcurrenv(L));
1031
setuvalue(L, L->top, u);
1040
static const char *aux_upvalue (StkId fi, int n, TValue **val) {
1042
if (!ttisfunction(fi)) return NULL;
1045
if (!(1 <= n && n <= f->c.nupvalues)) return NULL;
1046
*val = &f->c.upvalue[n-1];
1051
if (!(1 <= n && n <= p->sizeupvalues)) return NULL;
1052
*val = f->l.upvals[n-1]->v;
1053
return getstr(p->upvalues[n-1]);
1058
LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n) {
1062
name = aux_upvalue(index2adr(L, funcindex), n, &val);
1064
setobj2s(L, L->top, val);
1072
LUA_API const char *lua_setupvalue (lua_State *L, int funcindex, int n) {
1077
fi = index2adr(L, funcindex);
1078
api_checknelems(L, 1);
1079
name = aux_upvalue(fi, n, &val);
1082
setobj(L, val, L->top);
1083
luaC_barrier(L, clvalue(fi), L->top);
added
removed
debian/grub-extras/lua/lapi.c
