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