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- /*
- ** $Id: lapi.c,v 2.55.1.5 2008/07/04 18:41:18 roberto Exp $
- ** Lua API
- ** See Copyright Notice in lua.h
- */
- #define lapi_c
- #define LUA_CORE
- #include "lua.h"
- #include <math.h>
- #include <string.h>
- #include "lapi.h"
- #include "ldebug.h"
- #include "ldo.h"
- #include "lfunc.h"
- #include "lgc.h"
- #include "lmem.h"
- #include "lobject.h"
- #include "lstate.h"
- #include "lstring.h"
- #include "ltable.h"
- #include "ltm.h"
- #include "lundump.h"
- #include "lvm.h"
- #if 0
- const char lua_ident[] =
- "$Lua: " LUA_RELEASE " " LUA_COPYRIGHT " $\n"
- "$Authors: " LUA_AUTHORS " $\n"
- "$URL: www.lua.org $\n";
- #endif
- #define api_checknelems(L, n) api_check(L, (n) <= (L->top - L->base))
- #define api_checkvalidindex(L, i) api_check(L, (i) != luaO_nilobject)
- #define api_incr_top(L) {api_check(L, L->top < L->ci->top); L->top++;}
- static TValue *index2adr (lua_State *L, int idx) {
- if (idx > 0) {
- TValue *o = L->base + (idx - 1);
- api_check(L, idx <= L->ci->top - L->base);
- if (o >= L->top) return cast(TValue *, luaO_nilobject);
- else return o;
- }
- else if (idx > LUA_REGISTRYINDEX) {
- api_check(L, idx != 0 && -idx <= L->top - L->base);
- return L->top + idx;
- }
- else switch (idx) { /* pseudo-indices */
- case LUA_REGISTRYINDEX: return registry(L);
- case LUA_ENVIRONINDEX: {
- Closure *func = curr_func(L);
- sethvalue(L, &L->env, func ? func->c.env : hvalue(gt(L)));
- return &L->env;
- }
- case LUA_GLOBALSINDEX: return gt(L);
- default: {
- Closure *func = curr_func(L);
- if (!func) return cast(TValue *, luaO_nilobject);
- idx = LUA_GLOBALSINDEX - idx;
- return (idx <= func->c.nupvalues)
- ? &func->c.upvalue[idx-1]
- : cast(TValue *, luaO_nilobject);
- }
- }
- }
- static Table *getcurrenv (lua_State *L) {
- if (L->ci == L->base_ci) /* no enclosing function? */
- return hvalue(gt(L)); /* use global table as environment */
- else {
- Closure *func = curr_func(L);
- return func ? func->c.env : hvalue(gt(L));
- }
- }
- void luaA_pushobject (lua_State *L, const TValue *o) {
- setobj2s(L, L->top, o);
- api_incr_top(L);
- }
- LUA_API int lua_checkstack (lua_State *L, int size) {
- int res = 1;
- lua_lock(L);
- if (size > LUAI_MAXCSTACK || (L->top - L->base + size) > LUAI_MAXCSTACK)
- res = 0; /* stack overflow */
- else if (size > 0) {
- luaD_checkstack(L, size);
- if (L->ci->top < L->top + size)
- L->ci->top = L->top + size;
- }
- lua_unlock(L);
- return res;
- }
- LUA_API void lua_xmove (lua_State *from, lua_State *to, int n) {
- int i;
- if (from == to) return;
- lua_lock(to);
- api_checknelems(from, n);
- api_check(from, G(from) == G(to));
- api_check(from, to->ci->top - to->top >= n);
- from->top -= n;
- for (i = 0; i < n; i++) {
- setobj2s(to, to->top++, from->top + i);
- }
- lua_unlock(to);
- }
- LUA_API void lua_setlevel (lua_State *from, lua_State *to) {
- to->nCcalls = from->nCcalls;
- }
- LUA_API lua_CFunction lua_atpanic (lua_State *L, lua_CFunction panicf) {
- lua_CFunction old;
- lua_lock(L);
- old = G(L)->panic;
- G(L)->panic = panicf;
- lua_unlock(L);
- return old;
- }
- LUA_API lua_State *lua_newthread (lua_State *L) {
- lua_State *L1;
- lua_lock(L);
- luaC_checkGC(L);
- L1 = luaE_newthread(L);
- setthvalue(L, L->top, L1);
- api_incr_top(L);
- lua_unlock(L);
- luai_userstatethread(L, L1);
- return L1;
- }
- /*
- ** basic stack manipulation
- */
- /*
- ** convert an acceptable stack index into an absolute index
- */
- LUA_API int lua_absindex (lua_State *L, int idx) {
- return (idx > 0 || idx <= LUA_REGISTRYINDEX)
- ? idx
- : cast_int(L->top - L->base) - 1 + idx;
- }
- LUA_API int lua_gettop (lua_State *L) {
- return cast_int(L->top - L->base);
- }
- LUA_API void lua_settop (lua_State *L, int idx) {
- lua_lock(L);
- if (idx >= 0) {
- api_check(L, idx <= L->stack_last - L->base);
- while (L->top < L->base + idx)
- setnilvalue(L->top++);
- L->top = L->base + idx;
- }
- else {
- api_check(L, -(idx+1) <= (L->top - L->base));
- L->top += idx+1; /* `subtract' index (index is negative) */
- }
- lua_unlock(L);
- }
- LUA_API void lua_remove (lua_State *L, int idx) {
- StkId p;
- lua_lock(L);
- p = index2adr(L, idx);
- api_checkvalidindex(L, p);
- while (++p < L->top) setobjs2s(L, p-1, p);
- L->top--;
- lua_unlock(L);
- }
- LUA_API void lua_insert (lua_State *L, int idx) {
- StkId p;
- StkId q;
- lua_lock(L);
- p = index2adr(L, idx);
- api_checkvalidindex(L, p);
- for (q = L->top; q>p; q--) setobjs2s(L, q, q-1);
- setobjs2s(L, p, L->top);
- lua_unlock(L);
- }
- LUA_API void lua_replace (lua_State *L, int idx) {
- StkId o;
- lua_lock(L);
- /* explicit test for incompatible code */
- if (idx == LUA_ENVIRONINDEX && L->ci == L->base_ci)
- luaG_runerror(L, "no calling environment");
- api_checknelems(L, 1);
- o = index2adr(L, idx);
- api_checkvalidindex(L, o);
- if (idx == LUA_ENVIRONINDEX) {
- Closure *func = curr_func(L);
- if (!func)
- luaG_runerror(L, "attempt to set environment on lightfunction");
- else {
- api_check(L, ttistable(L->top - 1));
- func->c.env = hvalue(L->top - 1);
- luaC_barrier(L, func, L->top - 1);
- }
- }
- else {
- setobj(L, o, L->top - 1);
- if (curr_func(L) && idx < LUA_GLOBALSINDEX) /* function upvalue? */
- luaC_barrier(L, curr_func(L), L->top - 1);
- }
- L->top--;
- lua_unlock(L);
- }
- LUA_API void lua_pushvalue (lua_State *L, int idx) {
- lua_lock(L);
- setobj2s(L, L->top, index2adr(L, idx));
- api_incr_top(L);
- lua_unlock(L);
- }
- /*
- ** access functions (stack -> C)
- */
- LUA_API int lua_type (lua_State *L, int idx) {
- StkId o = index2adr(L, idx);
- return (o == luaO_nilobject) ? LUA_TNONE : ttnov(o);
- }
- LUA_API int lua_fulltype (lua_State *L, int idx) {
- StkId o = index2adr(L, idx);
- return (o == luaO_nilobject) ? LUA_TNONE : ttype(o);
- }
- LUA_API const char *lua_typename (lua_State *L, int t) {
- UNUSED(L);
- return (t == LUA_TNONE || t >= LUA_NUMTAGS) ? "no value" : luaT_typenames[t];
- }
- LUA_API int lua_iscfunction (lua_State *L, int idx) {
- StkId o = index2adr(L, idx);
- return iscfunction(o);
- }
- LUA_API int lua_isnumber (lua_State *L, int idx) {
- TValue n;
- const TValue *o = index2adr(L, idx);
- return tonumber(o, &n);
- }
- LUA_API int lua_isstring (lua_State *L, int idx) {
- int t = lua_type(L, idx);
- return (t == LUA_TSTRING || t == LUA_TNUMBER);
- }
- LUA_API int lua_isuserdata (lua_State *L, int idx) {
- const TValue *o = index2adr(L, idx);
- return (ttisuserdata(o) || ttislightuserdata(o));
- }
- LUA_API int lua_rawequal (lua_State *L, int index1, int index2) {
- StkId o1 = index2adr(L, index1);
- StkId o2 = index2adr(L, index2);
- return (o1 == luaO_nilobject || o2 == luaO_nilobject) ? 0
- : luaO_rawequalObj(o1, o2);
- }
- LUA_API int lua_compare (lua_State *L, int index1, int index2, int op) {
- StkId o1, o2;
- int i = 0;
- lua_lock(L); /* may call tag method */
- o1 = index2adr(L, index1);
- o2 = index2adr(L, index2);
- if (o1 != luaO_nilobject && o2 != luaO_nilobject) {
- switch (op) {
- case LUA_OPEQ: i = luaV_equalval(L, o1, o2); break;
- case LUA_OPLT: i = luaV_lessthan(L, o1, o2); break;
- case LUA_OPLE: i = luaV_lessequal(L, o1, o2); break;
- default: api_check(L, 0);
- }
- }
- lua_unlock(L);
- return i;
- }
- LUA_API lua_Number lua_tonumber (lua_State *L, int idx) {
- TValue n;
- const TValue *o = index2adr(L, idx);
- if (tonumber(o, &n))
- return nvalue(o);
- else
- return 0;
- }
- LUA_API lua_Integer lua_tointeger (lua_State *L, int idx) {
- TValue n;
- const TValue *o = index2adr(L, idx);
- if (tonumber(o, &n)) {
- lua_Integer res;
- lua_Number num = nvalue(o);
- lua_number2integer(res, num);
- return res;
- }
- else
- return 0;
- }
- LUA_API int lua_toboolean (lua_State *L, int idx) {
- const TValue *o = index2adr(L, idx);
- return !l_isfalse(o);
- }
- LUA_API const char *lua_tolstring (lua_State *L, int idx, size_t *len) {
- StkId o = index2adr(L, idx);
- if (!ttisstring(o)) {
- lua_lock(L); /* `luaV_tostring' may create a new string */
- if (!luaV_tostring(L, o)) { /* conversion failed? */
- if (len != NULL) *len = 0;
- lua_unlock(L);
- return NULL;
- }
- luaC_checkGC(L);
- o = index2adr(L, idx); /* previous call may reallocate the stack */
- lua_unlock(L);
- }
- if (len != NULL) *len = tsvalue(o)->len;
- return svalue(o);
- }
- LUA_API size_t lua_objlen (lua_State *L, int idx) {
- StkId o = index2adr(L, idx);
- switch (ttnov(o)) {
- case LUA_TSTRING: return tsvalue(o)->len;
- case LUA_TUSERDATA: return uvalue(o)->len;
- case LUA_TTABLE: return luaH_getn(hvalue(o));
- case LUA_TNUMBER: {
- size_t l;
- lua_lock(L); /* `luaV_tostring' may create a new string */
- l = (luaV_tostring(L, o) ? tsvalue(o)->len : 0);
- lua_unlock(L);
- return l;
- }
- default: return 0;
- }
- }
- LUA_API lua_CFunction lua_tocfunction (lua_State *L, int idx) {
- StkId o = index2adr(L, idx);
- return (!iscfunction(o)) ? NULL : clvalue(o)->c.f;
- }
- LUA_API void *lua_touserdata (lua_State *L, int idx) {
- StkId o = index2adr(L, idx);
- switch (ttype(o)) {
- case LUA_TUSERDATA: return (rawuvalue(o) + 1);
- case LUA_TLIGHTUSERDATA: return pvalue(o);
- default: return NULL;
- }
- }
- LUA_API lua_State *lua_tothread (lua_State *L, int idx) {
- StkId o = index2adr(L, idx);
- return (!ttisthread(o)) ? NULL : thvalue(o);
- }
- LUA_API const void *lua_topointer (lua_State *L, int idx) {
- StkId o = index2adr(L, idx);
- switch (ttype(o)) {
- case LUA_TTABLE:
- case LUA_TROTABLE:
- return hvalue(o);
- case LUA_TFUNCTION: return clvalue(o);
- case LUA_TTHREAD: return thvalue(o);
- case LUA_TUSERDATA: return lua_touserdata(L, idx);
- case LUA_TLIGHTUSERDATA: return pvalue(o);
- case LUA_TLIGHTFUNCTION: return fvalue(o);
- default: return NULL;
- }
- }
- /*
- ** push functions (C -> stack)
- */
- LUA_API void lua_pushnil (lua_State *L) {
- lua_lock(L);
- setnilvalue(L->top);
- api_incr_top(L);
- lua_unlock(L);
- }
- LUA_API void lua_pushnumber (lua_State *L, lua_Number n) {
- lua_lock(L);
- setnvalue(L->top, n);
- api_incr_top(L);
- lua_unlock(L);
- }
- LUA_API void lua_pushinteger (lua_State *L, lua_Integer n) {
- lua_lock(L);
- setnvalue(L->top, cast_num(n));
- api_incr_top(L);
- lua_unlock(L);
- }
- LUA_API void lua_pushlstring (lua_State *L, const char *s, size_t len) {
- lua_lock(L);
- luaC_checkGC(L);
- setsvalue2s(L, L->top, luaS_newlstr(L, s, len));
- api_incr_top(L);
- lua_unlock(L);
- }
- LUA_API void lua_pushstring (lua_State *L, const char *s) {
- if (s == NULL)
- lua_pushnil(L);
- else
- lua_pushlstring(L, s, strlen(s));
- }
- LUA_API const char *lua_pushvfstring (lua_State *L, const char *fmt,
- va_list argp) {
- const char *ret;
- lua_lock(L);
- luaC_checkGC(L);
- ret = luaO_pushvfstring(L, fmt, argp);
- lua_unlock(L);
- return ret;
- }
- LUA_API const char *lua_pushfstring (lua_State *L, const char *fmt, ...) {
- const char *ret;
- va_list argp;
- lua_lock(L);
- luaC_checkGC(L);
- va_start(argp, fmt);
- ret = luaO_pushvfstring(L, fmt, argp);
- va_end(argp);
- lua_unlock(L);
- return ret;
- }
- LUA_API void lua_pushcclosure (lua_State *L, lua_CFunction fn, int n) {
- lua_lock(L);
- if (n == 0) {
- setfvalue(L->top, fn);
- api_incr_top(L);
- } else {
- Closure *cl;
- luaC_checkGC(L);
- api_checknelems(L, n);
- cl = luaF_newCclosure(L, n, getcurrenv(L));
- cl->c.f = fn;
- L->top -= n;
- while (n--)
- setobj2n(L, &cl->c.upvalue[n], L->top+n);
- setclvalue(L, L->top, cl);
- lua_assert(iswhite(obj2gco(cl)));
- api_incr_top(L);
- }
- lua_unlock(L);
- }
- LUA_API void lua_pushboolean (lua_State *L, int b) {
- lua_lock(L);
- setbvalue(L->top, (b != 0)); /* ensure that true is 1 */
- api_incr_top(L);
- lua_unlock(L);
- }
- LUA_API void lua_pushlightuserdata (lua_State *L, void *p) {
- lua_lock(L);
- setpvalue(L->top, p);
- api_incr_top(L);
- lua_unlock(L);
- }
- LUA_API void lua_pushrotable (lua_State *L, const ROTable *t) {
- lua_lock(L);
- sethvalue(L, L->top, cast(ROTable *,t));
- api_incr_top(L);
- lua_unlock(L);
- }
- LUA_API int lua_pushthread (lua_State *L) {
- lua_lock(L);
- setthvalue(L, L->top, L);
- api_incr_top(L);
- lua_unlock(L);
- return (G(L)->mainthread == L);
- }
- /*
- ** get functions (Lua -> stack)
- */
- LUA_API int lua_gettable (lua_State *L, int idx) {
- StkId t;
- lua_lock(L);
- t = index2adr(L, idx);
- api_checkvalidindex(L, t);
- luaV_gettable(L, t, L->top - 1, L->top - 1);
- lua_unlock(L);
- return ttnov(L->top - 1);
- }
- LUA_API int lua_getfield (lua_State *L, int idx, const char *k) {
- StkId t;
- TValue key;
- lua_lock(L);
- t = index2adr(L, idx);
- api_checkvalidindex(L, t);
- fixedstack(L);
- setsvalue(L, &key, luaS_new(L, k));
- unfixedstack(L);
- luaV_gettable(L, t, &key, L->top);
- api_incr_top(L);
- lua_unlock(L);
- return ttnov(L->top - 1);
- }
- LUA_API int lua_geti (lua_State *L, int idx, int n) {
- StkId t;
- TValue key;
- lua_lock(L);
- t = index2adr(L, idx);
- api_checkvalidindex(L, t);
- fixedstack(L);
- setnvalue(&key, n);
- unfixedstack(L);
- luaV_gettable(L, t, &key, L->top);
- api_incr_top(L);
- lua_unlock(L);
- return ttnov(L->top - 1);
- }
- LUA_API int lua_rawget (lua_State *L, int idx) {
- StkId t;
- lua_lock(L);
- t = index2adr(L, idx);
- api_check(L, ttistable(t));
- setobj2s(L, L->top - 1, luaH_get(hvalue(t), L->top - 1));
- lua_unlock(L);
- return ttnov(L->top - 1);
- }
- LUA_API int lua_rawgeti (lua_State *L, int idx, int n) {
- StkId o;
- lua_lock(L);
- o = index2adr(L, idx);
- api_check(L, ttistable(o));
- setobj2s(L, L->top, luaH_getnum(hvalue(o), n));
- api_incr_top(L);
- lua_unlock(L);
- return ttnov(L->top - 1);
- }
- LUA_API int lua_rawgetp (lua_State *L, int idx, const void *p) {
- StkId t;
- TValue k;
- lua_lock(L);
- t = index2adr(L, idx);
- api_check(L, ttistable(t));
- setpvalue(&k, cast(void *, p));
- setobj2s(L, L->top, luaH_get(hvalue(t), &k));
- api_incr_top(L);
- lua_unlock(L);
- return ttnov(L->top - 1);
- }
- LUA_API void lua_createtable (lua_State *L, int narray, int nrec) {
- lua_lock(L);
- luaC_checkGC(L);
- sethvalue(L, L->top, luaH_new(L, narray, nrec));
- api_incr_top(L);
- lua_unlock(L);
- }
- LUA_API int lua_getmetatable (lua_State *L, int objindex) {
- const TValue *obj;
- Table *mt = NULL;
- int res;
- lua_lock(L);
- obj = index2adr(L, objindex);
- switch (ttnov(obj)) {
- case LUA_TTABLE:
- mt = hvalue(obj)->metatable;
- break;
- case LUA_TUSERDATA:
- mt = uvalue(obj)->metatable;
- break;
- default:
- mt = G(L)->mt[ttnov(obj)];
- break;
- }
- if (mt == NULL)
- res = 0;
- else {
- sethvalue(L, L->top, mt)
- api_incr_top(L);
- res = 1;
- }
- lua_unlock(L);
- return res;
- }
- LUA_API void lua_getfenv (lua_State *L, int idx) {
- StkId o;
- lua_lock(L);
- o = index2adr(L, idx);
- api_checkvalidindex(L, o);
- switch (ttype(o)) {
- case LUA_TFUNCTION:
- sethvalue(L, L->top, clvalue(o)->c.env);
- break;
- case LUA_TUSERDATA:
- sethvalue(L, L->top, uvalue(o)->env);
- break;
- case LUA_TTHREAD:
- setobj2s(L, L->top, gt(thvalue(o)));
- break;
- default:
- setnilvalue(L->top);
- break;
- }
- api_incr_top(L);
- lua_unlock(L);
- }
- /*
- ** set functions (stack -> Lua)
- */
- LUA_API void lua_settable (lua_State *L, int idx) {
- StkId t;
- lua_lock(L);
- api_checknelems(L, 2);
- t = index2adr(L, idx);
- api_checkvalidindex(L, t);
- luaV_settable(L, t, L->top - 2, L->top - 1);
- L->top -= 2; /* pop index and value */
- lua_unlock(L);
- }
- LUA_API void lua_setfield (lua_State *L, int idx, const char *k) {
- StkId t;
- lua_lock(L);
- api_checknelems(L, 1);
- t = index2adr(L, idx);
- api_checkvalidindex(L, t);
- setsvalue2s(L, L->top, luaS_new(L, k));
- api_incr_top(L);
- luaV_settable(L, t, L->top - 1, L->top - 2);
- L->top -= 2; /* pop key and value */
- lua_unlock(L);
- }
- LUA_API void lua_rawset (lua_State *L, int idx) {
- StkId t;
- lua_lock(L);
- api_checknelems(L, 2);
- t = index2adr(L, idx);
- api_check(L, ttistable(t));
- fixedstack(L);
- setobj2t(L, luaH_set(L, hvalue(t), L->top-2), L->top-1);
- unfixedstack(L);
- luaC_barriert(L, hvalue(t), L->top-1);
- L->top -= 2;
- lua_unlock(L);
- }
- LUA_API void lua_rawseti (lua_State *L, int idx, int n) {
- StkId o;
- lua_lock(L);
- api_checknelems(L, 1);
- o = index2adr(L, idx);
- api_check(L, ttistable(o));
- fixedstack(L);
- setobj2t(L, luaH_setnum(L, hvalue(o), n), L->top-1);
- unfixedstack(L);
- luaC_barriert(L, hvalue(o), L->top-1);
- L->top--;
- lua_unlock(L);
- }
- LUA_API void lua_rawsetp (lua_State *L, int idx, const void *p) {
- StkId o;
- TValue k;
- lua_lock(L);
- api_checknelems(L, 1);
- o = index2adr(L, idx);
- api_check(L, ttistable(o));
- fixedstack(L);
- setpvalue(&k, cast(void *, p))
- setobj2t(L, luaH_set(L, hvalue(o), &k), L->top-1);
- unfixedstack(L);
- luaC_barriert(L, hvalue(o), L->top-1);
- L->top--;
- lua_unlock(L);
- }
- LUA_API int lua_setmetatable (lua_State *L, int objindex) {
- TValue *obj;
- Table *mt;
- lua_lock(L);
- api_checknelems(L, 1);
- obj = index2adr(L, objindex);
- api_checkvalidindex(L, obj);
- if (ttisnil(L->top - 1)) {
- mt = NULL;
- } else {
- api_check(L, ttistable(L->top - 1));
- mt = hvalue(L->top - 1);
- }
- switch (ttype(obj)) { /* use basetype to retain subtypes*/
- case LUA_TTABLE: {
- hvalue(obj)->metatable = mt;
- if (mt && !isrotable(mt))
- luaC_objbarriert(L, hvalue(obj), mt);
- break;
- }
- case LUA_TUSERDATA: {
- uvalue(obj)->metatable = mt;
- if (mt && !isrotable(mt))
- luaC_objbarrier(L, rawuvalue(obj), mt);
- break;
- }
- case LUA_TISROTABLE: { /* Ignore any changes to a ROTable MT */
- break;
- }
- default: {
- G(L)->mt[ttnov(obj)] = mt;
- break;
- }
- }
- L->top--;
- lua_unlock(L);
- return 1;
- }
- LUA_API int lua_setfenv (lua_State *L, int idx) {
- StkId o;
- int res = 1;
- lua_lock(L);
- api_checknelems(L, 1);
- o = index2adr(L, idx);
- api_checkvalidindex(L, o);
- api_check(L, ttistable(L->top - 1));
- switch (ttype(o)) {
- case LUA_TFUNCTION:
- clvalue(o)->c.env = hvalue(L->top - 1);
- break;
- case LUA_TUSERDATA:
- uvalue(o)->env = hvalue(L->top - 1);
- break;
- case LUA_TTHREAD:
- sethvalue(L, gt(thvalue(o)), hvalue(L->top - 1));
- break;
- default:
- res = 0;
- break;
- }
- if (res) luaC_objbarrier(L, gcvalue(o), hvalue(L->top - 1));
- L->top--;
- lua_unlock(L);
- return res;
- }
- /*
- ** `load' and `call' functions (run Lua code)
- */
- #define adjustresults(L,nres) \
- { if (nres == LUA_MULTRET && L->top >= L->ci->top) L->ci->top = L->top; }
- #define checkresults(L,na,nr) \
- api_check(L, (nr) == LUA_MULTRET || (L->ci->top - L->top >= (nr) - (na)))
- LUA_API void lua_call (lua_State *L, int nargs, int nresults) {
- StkId func;
- lua_lock(L);
- api_checknelems(L, nargs+1);
- checkresults(L, nargs, nresults);
- func = L->top - (nargs+1);
- luaD_call(L, func, nresults);
- adjustresults(L, nresults);
- lua_unlock(L);
- }
- /*
- ** Execute a protected call.
- */
- struct CallS { /* data to `f_call' */
- StkId func;
- int nresults;
- };
- static void f_call (lua_State *L, void *ud) {
- struct CallS *c = cast(struct CallS *, ud);
- luaD_call(L, c->func, c->nresults);
- }
- LUA_API int lua_pcall (lua_State *L, int nargs, int nresults, int errfunc) {
- struct CallS c;
- int status;
- ptrdiff_t func;
- lua_lock(L);
- api_checknelems(L, nargs+1);
- checkresults(L, nargs, nresults);
- if (errfunc == 0)
- func = 0;
- else {
- StkId o = index2adr(L, errfunc);
- api_checkvalidindex(L, o);
- func = savestack(L, o);
- }
- c.func = L->top - (nargs+1); /* function to be called */
- c.nresults = nresults;
- status = luaD_pcall(L, f_call, &c, savestack(L, c.func), func);
- adjustresults(L, nresults);
- lua_unlock(L);
- return status;
- }
- /*
- ** Execute a protected C call.
- */
- struct CCallS { /* data to `f_Ccall' */
- lua_CFunction func;
- void *ud;
- };
- static void f_Ccall (lua_State *L, void *ud) {
- struct CCallS *c = cast(struct CCallS *, ud);
- Closure *cl;
- cl = luaF_newCclosure(L, 0, getcurrenv(L));
- cl->c.f = c->func;
- setclvalue(L, L->top, cl); /* push function */
- api_incr_top(L);
- setpvalue(L->top, c->ud); /* push only argument */
- api_incr_top(L);
- luaD_call(L, L->top - 2, 0);
- }
- LUA_API int lua_cpcall (lua_State *L, lua_CFunction func, void *ud) {
- struct CCallS c;
- int status;
- lua_lock(L);
- c.func = func;
- c.ud = ud;
- status = luaD_pcall(L, f_Ccall, &c, savestack(L, L->top), 0);
- lua_unlock(L);
- return status;
- }
- LUA_API int lua_load (lua_State *L, lua_Reader reader, void *data,
- const char *chunkname) {
- ZIO z;
- int status;
- lua_lock(L);
- if (!chunkname) chunkname = "?";
- luaZ_init(L, &z, reader, data);
- status = luaD_protectedparser(L, &z, chunkname);
- lua_unlock(L);
- return status;
- }
- LUA_API int lua_dump (lua_State *L, lua_Writer writer, void *data, int stripping) {
- int status;
- TValue *o;
- lua_lock(L);
- api_checknelems(L, 1);
- o = L->top - 1;
- if (isLfunction(o))
- status = luaU_dump(L, clvalue(o)->l.p, writer, data, stripping);
- else
- status = 1;
- lua_unlock(L);
- return status;
- }
- LUA_API int lua_stripdebug (lua_State *L, int stripping){
- TValue *o = L->top - 1;
- Proto *p = NULL;
- int res = -1;
- lua_lock(L);
- api_checknelems(L, 1);
- if (isLfunction(o)) {
- p = clvalue(o)->l.p;
- if (p && !isLFSobject(p) && (unsigned) stripping < 3 ) {
- // found a valid proto to strip
- res = luaG_stripdebug(L, p, stripping, 1);
- }
- } else if (ttisnil(L->top - 1)) {
- // get or set the default strip level
- if ((unsigned) stripping < 3)
- G(L)->stripdefault = stripping;
- res = G(L)->stripdefault;
- }
- L->top--;
- lua_unlock(L);
- return res;
- }
- LUA_API int lua_status (lua_State *L) {
- return L->status;
- }
- /*
- ** Garbage-collection function
- */
- LUA_API int lua_gc (lua_State *L, int what, int data) {
- int res = 0;
- global_State *g;
- lua_lock(L);
- g = G(L);
- switch (what) {
- case LUA_GCSTOP: {
- set_block_gc(L);
- break;
- }
- case LUA_GCRESTART: {
- unset_block_gc(L);
- break;
- }
- case LUA_GCCOLLECT: {
- luaC_fullgc(L);
- break;
- }
- case LUA_GCCOUNT: {
- /* GC values are expressed in Kbytes: #bytes/2^10 */
- res = cast_int(g->totalbytes >> 10);
- break;
- }
- case LUA_GCCOUNTB: {
- res = cast_int(g->totalbytes & 0x3ff);
- break;
- }
- case LUA_GCSTEP: {
- if(is_block_gc(L)) {
- res = 1; /* gc is block so we need to pretend that the collection cycle finished. */
- break;
- }
- lu_mem a = (cast(lu_mem, data) << 10);
- if (a <= g->totalbytes)
- g->GCthreshold = g->totalbytes - a;
- else
- g->GCthreshold = 0;
- while (g->GCthreshold <= g->totalbytes) {
- luaC_step(L);
- if (g->gcstate == GCSpause) { /* end of cycle? */
- res = 1; /* signal it */
- break;
- }
- }
- break;
- }
- case LUA_GCSETPAUSE: {
- res = g->gcpause;
- g->gcpause = data;
- break;
- }
- case LUA_GCSETSTEPMUL: {
- res = g->gcstepmul;
- g->gcstepmul = data;
- break;
- }
- case LUA_GCSETMEMLIMIT: {
- /* GC values are expressed in Kbytes: #bytes/2^10 */
- lu_mem new_memlimit = (cast(lu_mem, data) << 10);
- if(new_memlimit > 0 && new_memlimit < g->totalbytes) {
- /* run a full GC to make totalbytes < the new limit. */
- luaC_fullgc(L);
- if(new_memlimit < g->totalbytes)
- new_memlimit = (g->totalbytes + 1024) & ~(1024-1); /* round up to next multiple of 1024 */
- }
- g->memlimit = new_memlimit;
- /* new memlimit might be > then requested memlimit. */
- res = cast_int(new_memlimit >> 10);
- break;
- }
- case LUA_GCGETMEMLIMIT: {
- res = cast_int(g->memlimit >> 10);
- break;
- }
- default: res = -1; /* invalid option */
- }
- lua_unlock(L);
- return res;
- }
- /*
- ** miscellaneous functions
- */
- LUA_API int lua_error (lua_State *L) {
- lua_lock(L);
- api_checknelems(L, 1);
- luaG_errormsg(L);
- lua_unlock(L);
- return 0; /* to avoid warnings */
- }
- LUA_API int lua_next (lua_State *L, int idx) {
- StkId t;
- int more;
- lua_lock(L);
- t = index2adr(L, idx);
- api_check(L, ttistable(t));
- more = luaH_next(L, hvalue(t), L->top - 1);
- if (more) {
- api_incr_top(L);
- }
- else /* no more elements */
- L->top -= 1; /* remove key */
- lua_unlock(L);
- return more;
- }
- LUA_API void lua_concat (lua_State *L, int n) {
- lua_lock(L);
- api_checknelems(L, n);
- if (n >= 2) {
- luaC_checkGC(L);
- luaV_concat(L, n, cast_int(L->top - L->base) - 1);
- L->top -= (n-1);
- }
- else if (n == 0) { /* push empty string */
- setsvalue2s(L, L->top, luaS_newlstr(L, "", 0));
- api_incr_top(L);
- }
- /* else n == 1; nothing to do */
- lua_unlock(L);
- }
- LUA_API lua_Alloc lua_getallocf (lua_State *L, void **ud) {
- lua_Alloc f;
- lua_lock(L);
- if (ud) *ud = G(L)->ud;
- f = G(L)->frealloc;
- lua_unlock(L);
- return f;
- }
- LUA_API void lua_setallocf (lua_State *L, lua_Alloc f, void *ud) {
- lua_lock(L);
- G(L)->ud = ud;
- G(L)->frealloc = f;
- lua_unlock(L);
- }
- LUA_API void *lua_newuserdata (lua_State *L, size_t size) {
- Udata *u;
- lua_lock(L);
- luaC_checkGC(L);
- u = luaS_newudata(L, size, getcurrenv(L));
- setuvalue(L, L->top, u);
- api_incr_top(L);
- lua_unlock(L);
- return u + 1;
- }
- static const char *aux_upvalue (StkId fi, int n, TValue **val) {
- Closure *f;
- if (!ttisfunction(fi)) return NULL;
- f = clvalue(fi);
- if (f->c.isC) {
- if (!(1 <= n && n <= f->c.nupvalues)) return NULL;
- *val = &f->c.upvalue[n-1];
- return "";
- }
- else {
- Proto *p = f->l.p;
- if (!(1 <= n && n <= p->sizeupvalues)) return NULL;
- *val = f->l.upvals[n-1]->v;
- return getstr(p->upvalues[n-1]);
- }
- }
- LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n) {
- const char *name;
- TValue *val;
- lua_lock(L);
- name = aux_upvalue(index2adr(L, funcindex), n, &val);
- if (name) {
- setobj2s(L, L->top, val);
- api_incr_top(L);
- }
- lua_unlock(L);
- return name;
- }
- LUA_API const char *lua_setupvalue (lua_State *L, int funcindex, int n) {
- const char *name;
- TValue *val;
- StkId fi;
- lua_lock(L);
- fi = index2adr(L, funcindex);
- api_checknelems(L, 1);
- name = aux_upvalue(fi, n, &val);
- if (name) {
- L->top--;
- setobj(L, val, L->top);
- luaC_barrier(L, clvalue(fi), L->top);
- }
- lua_unlock(L);
- return name;
- }
- LUA_API void lua_setegcmode ( lua_State *L, int mode, int limit) {
- G(L)->egcmode = mode;
- G(L)->memlimit = limit;
- }
- LUA_API void lua_getegcinfo (lua_State *L, int *totals) {
- if (totals) {
- totals[0] = G(L)->totalbytes;
- totals[1] = G(L)->estimate;
- }
- }
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