mirror of
https://github.com/lua/lua
synced 2024-12-11 13:35:21 +03:00
1345 lines
32 KiB
C
1345 lines
32 KiB
C
/*
|
|
** $Id: lapi.c,v 2.282 2018/01/29 16:21:35 roberto Exp roberto $
|
|
** Lua API
|
|
** See Copyright Notice in lua.h
|
|
*/
|
|
|
|
#define lapi_c
|
|
#define LUA_CORE
|
|
|
|
#include "lprefix.h"
|
|
|
|
|
|
#include <stdarg.h>
|
|
#include <string.h>
|
|
|
|
#include "lua.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"
|
|
|
|
|
|
|
|
const char lua_ident[] =
|
|
"$LuaVersion: " LUA_COPYRIGHT " $"
|
|
"$LuaAuthors: " LUA_AUTHORS " $";
|
|
|
|
|
|
/* value at a non-valid index */
|
|
#define NONVALIDVALUE cast(TValue *, luaO_nilobject)
|
|
|
|
/* corresponding test */
|
|
#define isvalid(o) ((o) != luaO_nilobject)
|
|
|
|
/* test for pseudo index */
|
|
#define ispseudo(i) ((i) <= LUA_REGISTRYINDEX)
|
|
|
|
/* test for upvalue */
|
|
#define isupvalue(i) ((i) < LUA_REGISTRYINDEX)
|
|
|
|
/* test for valid but not pseudo index */
|
|
#define isstackindex(i, o) (isvalid(o) && !ispseudo(i))
|
|
|
|
#define api_checkvalidindex(l,o) api_check(l, isvalid(o), "invalid index")
|
|
|
|
#define api_checkstackindex(l, i, o) \
|
|
api_check(l, isstackindex(i, o), "index not in the stack")
|
|
|
|
|
|
static TValue *index2value (lua_State *L, int idx) {
|
|
CallInfo *ci = L->ci;
|
|
if (idx > 0) {
|
|
StkId o = ci->func + idx;
|
|
api_check(L, idx <= L->ci->top - (ci->func + 1), "unacceptable index");
|
|
if (o >= L->top) return NONVALIDVALUE;
|
|
else return s2v(o);
|
|
}
|
|
else if (!ispseudo(idx)) { /* negative index */
|
|
api_check(L, idx != 0 && -idx <= L->top - (ci->func + 1), "invalid index");
|
|
return s2v(L->top + idx);
|
|
}
|
|
else if (idx == LUA_REGISTRYINDEX)
|
|
return &G(L)->l_registry;
|
|
else { /* upvalues */
|
|
idx = LUA_REGISTRYINDEX - idx;
|
|
api_check(L, idx <= MAXUPVAL + 1, "upvalue index too large");
|
|
if (ttislcf(s2v(ci->func))) /* light C function? */
|
|
return NONVALIDVALUE; /* it has no upvalues */
|
|
else {
|
|
CClosure *func = clCvalue(s2v(ci->func));
|
|
return (idx <= func->nupvalues) ? &func->upvalue[idx-1] : NONVALIDVALUE;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
static StkId index2stack (lua_State *L, int idx) {
|
|
CallInfo *ci = L->ci;
|
|
if (idx > 0) {
|
|
StkId o = ci->func + idx;
|
|
api_check(L, o < L->top, "unacceptable index");
|
|
return o;
|
|
}
|
|
else { /* non-positive index */
|
|
api_check(L, idx != 0 && -idx <= L->top - (ci->func + 1), "invalid index");
|
|
api_check(L, !ispseudo(idx), "invalid index");
|
|
return L->top + idx;
|
|
}
|
|
}
|
|
|
|
|
|
LUA_API int lua_checkstack (lua_State *L, int n) {
|
|
int res;
|
|
CallInfo *ci = L->ci;
|
|
lua_lock(L);
|
|
api_check(L, n >= 0, "negative 'n'");
|
|
if (L->stack_last - L->top > n) /* stack large enough? */
|
|
res = 1; /* yes; check is OK */
|
|
else { /* no; need to grow stack */
|
|
int inuse = cast_int(L->top - L->stack) + EXTRA_STACK;
|
|
if (inuse > LUAI_MAXSTACK - n) /* can grow without overflow? */
|
|
res = 0; /* no */
|
|
else /* try to grow stack */
|
|
res = luaD_growstack(L, n, 0);
|
|
}
|
|
if (res && ci->top < L->top + n)
|
|
ci->top = L->top + n; /* adjust frame top */
|
|
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), "moving among independent states");
|
|
api_check(from, to->ci->top - to->top >= n, "stack overflow");
|
|
from->top -= n;
|
|
for (i = 0; i < n; i++) {
|
|
setobjs2s(to, to->top, from->top + i);
|
|
to->top++; /* stack already checked by previous 'api_check' */
|
|
}
|
|
lua_unlock(to);
|
|
}
|
|
|
|
|
|
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 const lua_Number *lua_version (lua_State *L) {
|
|
static const lua_Number version = LUA_VERSION_NUM;
|
|
if (L == NULL) return &version;
|
|
else return G(L)->version;
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
** 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 || ispseudo(idx))
|
|
? idx
|
|
: cast_int(L->top - L->ci->func) + idx;
|
|
}
|
|
|
|
|
|
LUA_API int lua_gettop (lua_State *L) {
|
|
return cast_int(L->top - (L->ci->func + 1));
|
|
}
|
|
|
|
|
|
LUA_API void lua_settop (lua_State *L, int idx) {
|
|
StkId func = L->ci->func;
|
|
lua_lock(L);
|
|
if (idx >= 0) {
|
|
api_check(L, idx <= L->stack_last - (func + 1), "new top too large");
|
|
while (L->top < (func + 1) + idx)
|
|
setnilvalue(s2v(L->top++));
|
|
L->top = (func + 1) + idx;
|
|
}
|
|
else {
|
|
api_check(L, -(idx+1) <= (L->top - (func + 1)), "invalid new top");
|
|
L->top += idx+1; /* 'subtract' index (index is negative) */
|
|
}
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
/*
|
|
** Reverse the stack segment from 'from' to 'to'
|
|
** (auxiliary to 'lua_rotate')
|
|
** Note that we move(copy) only the value inside the stack.
|
|
** (We do not move additional fields that may exist.)
|
|
*/
|
|
static void reverse (lua_State *L, StkId from, StkId to) {
|
|
for (; from < to; from++, to--) {
|
|
TValue temp;
|
|
setobj(L, &temp, s2v(from));
|
|
setobjs2s(L, from, to);
|
|
setobj2s(L, to, &temp);
|
|
}
|
|
}
|
|
|
|
|
|
/*
|
|
** Let x = AB, where A is a prefix of length 'n'. Then,
|
|
** rotate x n == BA. But BA == (A^r . B^r)^r.
|
|
*/
|
|
LUA_API void lua_rotate (lua_State *L, int idx, int n) {
|
|
StkId p, t, m;
|
|
lua_lock(L);
|
|
t = L->top - 1; /* end of stack segment being rotated */
|
|
p = index2stack(L, idx); /* start of segment */
|
|
api_check(L, (n >= 0 ? n : -n) <= (t - p + 1), "invalid 'n'");
|
|
m = (n >= 0 ? t - n : p - n - 1); /* end of prefix */
|
|
reverse(L, p, m); /* reverse the prefix with length 'n' */
|
|
reverse(L, m + 1, t); /* reverse the suffix */
|
|
reverse(L, p, t); /* reverse the entire segment */
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_copy (lua_State *L, int fromidx, int toidx) {
|
|
TValue *fr, *to;
|
|
lua_lock(L);
|
|
fr = index2value(L, fromidx);
|
|
to = index2value(L, toidx);
|
|
api_checkvalidindex(L, to);
|
|
setobj(L, to, fr);
|
|
if (isupvalue(toidx)) /* function upvalue? */
|
|
luaC_barrier(L, clCvalue(s2v(L->ci->func)), fr);
|
|
/* LUA_REGISTRYINDEX does not need gc barrier
|
|
(collector revisits it before finishing collection) */
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_pushvalue (lua_State *L, int idx) {
|
|
lua_lock(L);
|
|
setobj2s(L, L->top, index2value(L, idx));
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
** access functions (stack -> C)
|
|
*/
|
|
|
|
|
|
LUA_API int lua_type (lua_State *L, int idx) {
|
|
const TValue *o = index2value(L, idx);
|
|
return (isvalid(o) ? ttnov(o) : LUA_TNONE);
|
|
}
|
|
|
|
|
|
LUA_API const char *lua_typename (lua_State *L, int t) {
|
|
UNUSED(L);
|
|
api_check(L, LUA_TNONE <= t && t < LUA_NUMTAGS, "invalid tag");
|
|
return ttypename(t);
|
|
}
|
|
|
|
|
|
LUA_API int lua_iscfunction (lua_State *L, int idx) {
|
|
const TValue *o = index2value(L, idx);
|
|
return (ttislcf(o) || (ttisCclosure(o)));
|
|
}
|
|
|
|
|
|
LUA_API int lua_isinteger (lua_State *L, int idx) {
|
|
const TValue *o = index2value(L, idx);
|
|
return ttisinteger(o);
|
|
}
|
|
|
|
|
|
LUA_API int lua_isnumber (lua_State *L, int idx) {
|
|
lua_Number n;
|
|
const TValue *o = index2value(L, idx);
|
|
return tonumber(o, &n);
|
|
}
|
|
|
|
|
|
LUA_API int lua_isstring (lua_State *L, int idx) {
|
|
const TValue *o = index2value(L, idx);
|
|
return (ttisstring(o) || cvt2str(o));
|
|
}
|
|
|
|
|
|
LUA_API int lua_isuserdata (lua_State *L, int idx) {
|
|
const TValue *o = index2value(L, idx);
|
|
return (ttisfulluserdata(o) || ttislightuserdata(o));
|
|
}
|
|
|
|
|
|
LUA_API int lua_rawequal (lua_State *L, int index1, int index2) {
|
|
const TValue *o1 = index2value(L, index1);
|
|
const TValue *o2 = index2value(L, index2);
|
|
return (isvalid(o1) && isvalid(o2)) ? luaV_rawequalobj(o1, o2) : 0;
|
|
}
|
|
|
|
|
|
LUA_API void lua_arith (lua_State *L, int op) {
|
|
lua_lock(L);
|
|
if (op != LUA_OPUNM && op != LUA_OPBNOT)
|
|
api_checknelems(L, 2); /* all other operations expect two operands */
|
|
else { /* for unary operations, add fake 2nd operand */
|
|
api_checknelems(L, 1);
|
|
setobjs2s(L, L->top, L->top - 1);
|
|
api_incr_top(L);
|
|
}
|
|
/* first operand at top - 2, second at top - 1; result go to top - 2 */
|
|
luaO_arith(L, op, s2v(L->top - 2), s2v(L->top - 1), L->top - 2);
|
|
L->top--; /* remove second operand */
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API int lua_compare (lua_State *L, int index1, int index2, int op) {
|
|
const TValue *o1;
|
|
const TValue *o2;
|
|
int i = 0;
|
|
lua_lock(L); /* may call tag method */
|
|
o1 = index2value(L, index1);
|
|
o2 = index2value(L, index2);
|
|
if (isvalid(o1) && isvalid(o2)) {
|
|
switch (op) {
|
|
case LUA_OPEQ: i = luaV_equalobj(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, "invalid option");
|
|
}
|
|
}
|
|
lua_unlock(L);
|
|
return i;
|
|
}
|
|
|
|
|
|
LUA_API size_t lua_stringtonumber (lua_State *L, const char *s) {
|
|
size_t sz = luaO_str2num(s, s2v(L->top));
|
|
if (sz != 0)
|
|
api_incr_top(L);
|
|
return sz;
|
|
}
|
|
|
|
|
|
LUA_API lua_Number lua_tonumberx (lua_State *L, int idx, int *pisnum) {
|
|
lua_Number n;
|
|
const TValue *o = index2value(L, idx);
|
|
int isnum = tonumber(o, &n);
|
|
if (!isnum)
|
|
n = 0; /* call to 'tonumber' may change 'n' even if it fails */
|
|
if (pisnum) *pisnum = isnum;
|
|
return n;
|
|
}
|
|
|
|
|
|
LUA_API lua_Integer lua_tointegerx (lua_State *L, int idx, int *pisnum) {
|
|
lua_Integer res;
|
|
const TValue *o = index2value(L, idx);
|
|
int isnum = tointeger(o, &res);
|
|
if (!isnum)
|
|
res = 0; /* call to 'tointeger' may change 'n' even if it fails */
|
|
if (pisnum) *pisnum = isnum;
|
|
return res;
|
|
}
|
|
|
|
|
|
LUA_API int lua_toboolean (lua_State *L, int idx) {
|
|
const TValue *o = index2value(L, idx);
|
|
return !l_isfalse(o);
|
|
}
|
|
|
|
|
|
LUA_API const char *lua_tolstring (lua_State *L, int idx, size_t *len) {
|
|
TValue *o = index2value(L, idx);
|
|
if (!ttisstring(o)) {
|
|
if (!cvt2str(o)) { /* not convertible? */
|
|
if (len != NULL) *len = 0;
|
|
return NULL;
|
|
}
|
|
lua_lock(L); /* 'luaO_tostring' may create a new string */
|
|
luaO_tostring(L, o);
|
|
luaC_checkGC(L);
|
|
o = index2value(L, idx); /* previous call may reallocate the stack */
|
|
lua_unlock(L);
|
|
}
|
|
if (len != NULL)
|
|
*len = vslen(o);
|
|
return svalue(o);
|
|
}
|
|
|
|
|
|
LUA_API lua_Unsigned lua_rawlen (lua_State *L, int idx) {
|
|
const TValue *o = index2value(L, idx);
|
|
switch (ttype(o)) {
|
|
case LUA_TSHRSTR: return tsvalue(o)->shrlen;
|
|
case LUA_TLNGSTR: return tsvalue(o)->u.lnglen;
|
|
case LUA_TUSERDATA: return uvalue(o)->len;
|
|
case LUA_TTABLE: return luaH_getn(hvalue(o));
|
|
default: return 0;
|
|
}
|
|
}
|
|
|
|
|
|
LUA_API lua_CFunction lua_tocfunction (lua_State *L, int idx) {
|
|
const TValue *o = index2value(L, idx);
|
|
if (ttislcf(o)) return fvalue(o);
|
|
else if (ttisCclosure(o))
|
|
return clCvalue(o)->f;
|
|
else return NULL; /* not a C function */
|
|
}
|
|
|
|
|
|
LUA_API void *lua_touserdata (lua_State *L, int idx) {
|
|
const TValue *o = index2value(L, idx);
|
|
switch (ttnov(o)) {
|
|
case LUA_TUSERDATA: return getudatamem(uvalue(o));
|
|
case LUA_TLIGHTUSERDATA: return pvalue(o);
|
|
default: return NULL;
|
|
}
|
|
}
|
|
|
|
|
|
LUA_API lua_State *lua_tothread (lua_State *L, int idx) {
|
|
const TValue *o = index2value(L, idx);
|
|
return (!ttisthread(o)) ? NULL : thvalue(o);
|
|
}
|
|
|
|
|
|
LUA_API const void *lua_topointer (lua_State *L, int idx) {
|
|
const TValue *o = index2value(L, idx);
|
|
switch (ttype(o)) {
|
|
case LUA_TTABLE: return hvalue(o);
|
|
case LUA_TLCL: return clLvalue(o);
|
|
case LUA_TCCL: return clCvalue(o);
|
|
case LUA_TLCF: return cast_voidp(cast_sizet(fvalue(o)));
|
|
case LUA_TTHREAD: return thvalue(o);
|
|
case LUA_TUSERDATA: return getudatamem(uvalue(o));
|
|
case LUA_TLIGHTUSERDATA: return pvalue(o);
|
|
default: return NULL;
|
|
}
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
** push functions (C -> stack)
|
|
*/
|
|
|
|
|
|
LUA_API void lua_pushnil (lua_State *L) {
|
|
lua_lock(L);
|
|
setnilvalue(s2v(L->top));
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_pushnumber (lua_State *L, lua_Number n) {
|
|
lua_lock(L);
|
|
setfltvalue(s2v(L->top), n);
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_pushinteger (lua_State *L, lua_Integer n) {
|
|
lua_lock(L);
|
|
setivalue(s2v(L->top), n);
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
/*
|
|
** Pushes on the stack a string with given length. Avoid using 's' when
|
|
** 'len' == 0 (as 's' can be NULL in that case), due to later use of
|
|
** 'memcmp' and 'memcpy'.
|
|
*/
|
|
LUA_API const char *lua_pushlstring (lua_State *L, const char *s, size_t len) {
|
|
TString *ts;
|
|
lua_lock(L);
|
|
ts = (len == 0) ? luaS_new(L, "") : luaS_newlstr(L, s, len);
|
|
setsvalue2s(L, L->top, ts);
|
|
api_incr_top(L);
|
|
luaC_checkGC(L);
|
|
lua_unlock(L);
|
|
return getstr(ts);
|
|
}
|
|
|
|
|
|
LUA_API const char *lua_pushstring (lua_State *L, const char *s) {
|
|
lua_lock(L);
|
|
if (s == NULL)
|
|
setnilvalue(s2v(L->top));
|
|
else {
|
|
TString *ts;
|
|
ts = luaS_new(L, s);
|
|
setsvalue2s(L, L->top, ts);
|
|
s = getstr(ts); /* internal copy's address */
|
|
}
|
|
api_incr_top(L);
|
|
luaC_checkGC(L);
|
|
lua_unlock(L);
|
|
return s;
|
|
}
|
|
|
|
|
|
LUA_API const char *lua_pushvfstring (lua_State *L, const char *fmt,
|
|
va_list argp) {
|
|
const char *ret;
|
|
lua_lock(L);
|
|
ret = luaO_pushvfstring(L, fmt, argp);
|
|
luaC_checkGC(L);
|
|
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);
|
|
va_start(argp, fmt);
|
|
ret = luaO_pushvfstring(L, fmt, argp);
|
|
va_end(argp);
|
|
luaC_checkGC(L);
|
|
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(s2v(L->top), fn);
|
|
api_incr_top(L);
|
|
}
|
|
else {
|
|
CClosure *cl;
|
|
api_checknelems(L, n);
|
|
api_check(L, n <= MAXUPVAL, "upvalue index too large");
|
|
cl = luaF_newCclosure(L, n);
|
|
cl->f = fn;
|
|
L->top -= n;
|
|
while (n--) {
|
|
setobj2n(L, &cl->upvalue[n], s2v(L->top + n));
|
|
/* does not need barrier because closure is white */
|
|
}
|
|
setclCvalue(L, s2v(L->top), cl);
|
|
api_incr_top(L);
|
|
luaC_checkGC(L);
|
|
}
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_pushboolean (lua_State *L, int b) {
|
|
lua_lock(L);
|
|
setbvalue(s2v(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(s2v(L->top), p);
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API int lua_pushthread (lua_State *L) {
|
|
lua_lock(L);
|
|
setthvalue(L, s2v(L->top), L);
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
return (G(L)->mainthread == L);
|
|
}
|
|
|
|
|
|
|
|
/*
|
|
** get functions (Lua -> stack)
|
|
*/
|
|
|
|
|
|
static int auxgetstr (lua_State *L, const TValue *t, const char *k) {
|
|
const TValue *slot;
|
|
TString *str = luaS_new(L, k);
|
|
if (luaV_fastget(L, t, str, slot, luaH_getstr)) {
|
|
setobj2s(L, L->top, slot);
|
|
api_incr_top(L);
|
|
}
|
|
else {
|
|
setsvalue2s(L, L->top, str);
|
|
api_incr_top(L);
|
|
luaV_finishget(L, t, s2v(L->top - 1), L->top - 1, slot);
|
|
}
|
|
lua_unlock(L);
|
|
return ttnov(s2v(L->top - 1));
|
|
}
|
|
|
|
|
|
LUA_API int lua_getglobal (lua_State *L, const char *name) {
|
|
Table *reg = hvalue(&G(L)->l_registry);
|
|
lua_lock(L);
|
|
return auxgetstr(L, luaH_getint(reg, LUA_RIDX_GLOBALS), name);
|
|
}
|
|
|
|
|
|
LUA_API int lua_gettable (lua_State *L, int idx) {
|
|
const TValue *slot;
|
|
TValue *t;
|
|
lua_lock(L);
|
|
t = index2value(L, idx);
|
|
if (luaV_fastget(L, t, s2v(L->top - 1), slot, luaH_get)) {
|
|
setobj2s(L, L->top - 1, slot);
|
|
}
|
|
else
|
|
luaV_finishget(L, t, s2v(L->top - 1), L->top - 1, slot);
|
|
lua_unlock(L);
|
|
return ttnov(s2v(L->top - 1));
|
|
}
|
|
|
|
|
|
LUA_API int lua_getfield (lua_State *L, int idx, const char *k) {
|
|
lua_lock(L);
|
|
return auxgetstr(L, index2value(L, idx), k);
|
|
}
|
|
|
|
|
|
LUA_API int lua_geti (lua_State *L, int idx, lua_Integer n) {
|
|
TValue *t;
|
|
const TValue *slot;
|
|
lua_lock(L);
|
|
t = index2value(L, idx);
|
|
if (luaV_fastgeti(L, t, n, slot)) {
|
|
setobj2s(L, L->top, slot);
|
|
}
|
|
else {
|
|
TValue aux;
|
|
setivalue(&aux, n);
|
|
luaV_finishget(L, t, &aux, L->top, slot);
|
|
}
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
return ttnov(s2v(L->top - 1));
|
|
}
|
|
|
|
|
|
LUA_API int lua_rawget (lua_State *L, int idx) {
|
|
TValue *t;
|
|
lua_lock(L);
|
|
t = index2value(L, idx);
|
|
api_check(L, ttistable(t), "table expected");
|
|
setobj2s(L, L->top - 1, luaH_get(hvalue(t), s2v(L->top - 1)));
|
|
lua_unlock(L);
|
|
return ttnov(s2v(L->top - 1));
|
|
}
|
|
|
|
|
|
LUA_API int lua_rawgeti (lua_State *L, int idx, lua_Integer n) {
|
|
TValue *t;
|
|
lua_lock(L);
|
|
t = index2value(L, idx);
|
|
api_check(L, ttistable(t), "table expected");
|
|
setobj2s(L, L->top, luaH_getint(hvalue(t), n));
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
return ttnov(s2v(L->top - 1));
|
|
}
|
|
|
|
|
|
LUA_API int lua_rawgetp (lua_State *L, int idx, const void *p) {
|
|
TValue *t;
|
|
TValue k;
|
|
lua_lock(L);
|
|
t = index2value(L, idx);
|
|
api_check(L, ttistable(t), "table expected");
|
|
setpvalue(&k, cast_voidp(p));
|
|
setobj2s(L, L->top, luaH_get(hvalue(t), &k));
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
return ttnov(s2v(L->top - 1));
|
|
}
|
|
|
|
|
|
LUA_API void lua_createtable (lua_State *L, int narray, int nrec) {
|
|
Table *t;
|
|
lua_lock(L);
|
|
t = luaH_new(L);
|
|
sethvalue2s(L, L->top, t);
|
|
api_incr_top(L);
|
|
if (narray > 0 || nrec > 0)
|
|
luaH_resize(L, t, narray, nrec);
|
|
luaC_checkGC(L);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API int lua_getmetatable (lua_State *L, int objindex) {
|
|
const TValue *obj;
|
|
Table *mt;
|
|
int res = 0;
|
|
lua_lock(L);
|
|
obj = index2value(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) {
|
|
sethvalue2s(L, L->top, mt);
|
|
api_incr_top(L);
|
|
res = 1;
|
|
}
|
|
lua_unlock(L);
|
|
return res;
|
|
}
|
|
|
|
|
|
LUA_API int lua_getuservalue (lua_State *L, int idx) {
|
|
TValue *o;
|
|
lua_lock(L);
|
|
o = index2value(L, idx);
|
|
api_check(L, ttisfulluserdata(o), "full userdata expected");
|
|
getuservalue(L, uvalue(o), s2v(L->top));
|
|
api_incr_top(L);
|
|
lua_unlock(L);
|
|
return ttnov(s2v(L->top - 1));
|
|
}
|
|
|
|
|
|
/*
|
|
** set functions (stack -> Lua)
|
|
*/
|
|
|
|
/*
|
|
** t[k] = value at the top of the stack (where 'k' is a string)
|
|
*/
|
|
static void auxsetstr (lua_State *L, const TValue *t, const char *k) {
|
|
const TValue *slot;
|
|
TString *str = luaS_new(L, k);
|
|
api_checknelems(L, 1);
|
|
if (luaV_fastget(L, t, str, slot, luaH_getstr)) {
|
|
luaV_finishfastset(L, t, slot, s2v(L->top - 1));
|
|
L->top--; /* pop value */
|
|
}
|
|
else {
|
|
setsvalue2s(L, L->top, str); /* push 'str' (to make it a TValue) */
|
|
api_incr_top(L);
|
|
luaV_finishset(L, t, s2v(L->top - 1), s2v(L->top - 2), slot);
|
|
L->top -= 2; /* pop value and key */
|
|
}
|
|
lua_unlock(L); /* lock done by caller */
|
|
}
|
|
|
|
|
|
LUA_API void lua_setglobal (lua_State *L, const char *name) {
|
|
Table *reg = hvalue(&G(L)->l_registry);
|
|
lua_lock(L); /* unlock done in 'auxsetstr' */
|
|
auxsetstr(L, luaH_getint(reg, LUA_RIDX_GLOBALS), name);
|
|
}
|
|
|
|
|
|
LUA_API void lua_settable (lua_State *L, int idx) {
|
|
TValue *t;
|
|
const TValue *slot;
|
|
lua_lock(L);
|
|
api_checknelems(L, 2);
|
|
t = index2value(L, idx);
|
|
if (luaV_fastget(L, t, s2v(L->top - 2), slot, luaH_get)) {
|
|
luaV_finishfastset(L, t, slot, s2v(L->top - 1));
|
|
}
|
|
else
|
|
luaV_finishset(L, t, s2v(L->top - 2), s2v(L->top - 1), slot);
|
|
L->top -= 2; /* pop index and value */
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_setfield (lua_State *L, int idx, const char *k) {
|
|
lua_lock(L); /* unlock done in 'auxsetstr' */
|
|
auxsetstr(L, index2value(L, idx), k);
|
|
}
|
|
|
|
|
|
LUA_API void lua_seti (lua_State *L, int idx, lua_Integer n) {
|
|
TValue *t;
|
|
const TValue *slot;
|
|
lua_lock(L);
|
|
api_checknelems(L, 1);
|
|
t = index2value(L, idx);
|
|
if (luaV_fastgeti(L, t, n, slot)) {
|
|
luaV_finishfastset(L, t, slot, s2v(L->top - 1));
|
|
}
|
|
else {
|
|
TValue aux;
|
|
setivalue(&aux, n);
|
|
luaV_finishset(L, t, &aux, s2v(L->top - 1), slot);
|
|
}
|
|
L->top--; /* pop value */
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_rawset (lua_State *L, int idx) {
|
|
TValue *o;
|
|
TValue *slot;
|
|
lua_lock(L);
|
|
api_checknelems(L, 2);
|
|
o = index2value(L, idx);
|
|
api_check(L, ttistable(o), "table expected");
|
|
slot = luaH_set(L, hvalue(o), s2v(L->top - 2));
|
|
setobj2t(L, slot, s2v(L->top - 1));
|
|
invalidateTMcache(hvalue(o));
|
|
luaC_barrierback(L, hvalue(o), s2v(L->top - 1));
|
|
L->top -= 2;
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_rawseti (lua_State *L, int idx, lua_Integer n) {
|
|
TValue *o;
|
|
lua_lock(L);
|
|
api_checknelems(L, 1);
|
|
o = index2value(L, idx);
|
|
api_check(L, ttistable(o), "table expected");
|
|
luaH_setint(L, hvalue(o), n, s2v(L->top - 1));
|
|
luaC_barrierback(L, hvalue(o), s2v(L->top - 1));
|
|
L->top--;
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_rawsetp (lua_State *L, int idx, const void *p) {
|
|
TValue *o;
|
|
TValue k, *slot;
|
|
lua_lock(L);
|
|
api_checknelems(L, 1);
|
|
o = index2value(L, idx);
|
|
api_check(L, ttistable(o), "table expected");
|
|
setpvalue(&k, cast_voidp(p));
|
|
slot = luaH_set(L, hvalue(o), &k);
|
|
setobj2t(L, slot, s2v(L->top - 1));
|
|
luaC_barrierback(L, hvalue(o), s2v(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 = index2value(L, objindex);
|
|
if (ttisnil(s2v(L->top - 1)))
|
|
mt = NULL;
|
|
else {
|
|
api_check(L, ttistable(s2v(L->top - 1)), "table expected");
|
|
mt = hvalue(s2v(L->top - 1));
|
|
}
|
|
switch (ttnov(obj)) {
|
|
case LUA_TTABLE: {
|
|
hvalue(obj)->metatable = mt;
|
|
if (mt) {
|
|
luaC_objbarrier(L, gcvalue(obj), mt);
|
|
luaC_checkfinalizer(L, gcvalue(obj), mt);
|
|
}
|
|
break;
|
|
}
|
|
case LUA_TUSERDATA: {
|
|
uvalue(obj)->metatable = mt;
|
|
if (mt) {
|
|
luaC_objbarrier(L, uvalue(obj), mt);
|
|
luaC_checkfinalizer(L, gcvalue(obj), mt);
|
|
}
|
|
break;
|
|
}
|
|
default: {
|
|
G(L)->mt[ttnov(obj)] = mt;
|
|
break;
|
|
}
|
|
}
|
|
L->top--;
|
|
lua_unlock(L);
|
|
return 1;
|
|
}
|
|
|
|
|
|
LUA_API void lua_setuservalue (lua_State *L, int idx) {
|
|
TValue *o;
|
|
lua_lock(L);
|
|
api_checknelems(L, 1);
|
|
o = index2value(L, idx);
|
|
api_check(L, ttisfulluserdata(o), "full userdata expected");
|
|
setuservalue(L, uvalue(o), s2v(L->top - 1));
|
|
luaC_barrier(L, gcvalue(o), s2v(L->top - 1));
|
|
L->top--;
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
/*
|
|
** 'load' and 'call' functions (run Lua code)
|
|
*/
|
|
|
|
|
|
#define checkresults(L,na,nr) \
|
|
api_check(L, (nr) == LUA_MULTRET || (L->ci->top - L->top >= (nr) - (na)), \
|
|
"results from function overflow current stack size")
|
|
|
|
|
|
LUA_API void lua_callk (lua_State *L, int nargs, int nresults,
|
|
lua_KContext ctx, lua_KFunction k) {
|
|
StkId func;
|
|
lua_lock(L);
|
|
api_check(L, k == NULL || !isLua(L->ci),
|
|
"cannot use continuations inside hooks");
|
|
api_checknelems(L, nargs+1);
|
|
api_check(L, L->status == LUA_OK, "cannot do calls on non-normal thread");
|
|
checkresults(L, nargs, nresults);
|
|
func = L->top - (nargs+1);
|
|
if (k != NULL && L->nny == 0) { /* need to prepare continuation? */
|
|
L->ci->u.c.k = k; /* save continuation */
|
|
L->ci->u.c.ctx = ctx; /* save context */
|
|
luaD_call(L, func, nresults); /* do the call */
|
|
}
|
|
else /* no continuation or no yieldable */
|
|
luaD_callnoyield(L, func, nresults); /* just do the call */
|
|
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_callnoyield(L, c->func, c->nresults);
|
|
}
|
|
|
|
|
|
|
|
LUA_API int lua_pcallk (lua_State *L, int nargs, int nresults, int errfunc,
|
|
lua_KContext ctx, lua_KFunction k) {
|
|
struct CallS c;
|
|
int status;
|
|
ptrdiff_t func;
|
|
lua_lock(L);
|
|
api_check(L, k == NULL || !isLua(L->ci),
|
|
"cannot use continuations inside hooks");
|
|
api_checknelems(L, nargs+1);
|
|
api_check(L, L->status == LUA_OK, "cannot do calls on non-normal thread");
|
|
checkresults(L, nargs, nresults);
|
|
if (errfunc == 0)
|
|
func = 0;
|
|
else {
|
|
StkId o = index2stack(L, errfunc);
|
|
api_check(L, ttisfunction(s2v(o)), "error handler must be a function");
|
|
func = savestack(L, o);
|
|
}
|
|
c.func = L->top - (nargs+1); /* function to be called */
|
|
if (k == NULL || L->nny > 0) { /* no continuation or no yieldable? */
|
|
c.nresults = nresults; /* do a 'conventional' protected call */
|
|
status = luaD_pcall(L, f_call, &c, savestack(L, c.func), func);
|
|
}
|
|
else { /* prepare continuation (call is already protected by 'resume') */
|
|
CallInfo *ci = L->ci;
|
|
ci->u.c.k = k; /* save continuation */
|
|
ci->u.c.ctx = ctx; /* save context */
|
|
/* save information for error recovery */
|
|
ci->u2.funcidx = cast_int(savestack(L, c.func));
|
|
ci->u.c.old_errfunc = L->errfunc;
|
|
L->errfunc = func;
|
|
setoah(ci->callstatus, L->allowhook); /* save value of 'allowhook' */
|
|
ci->callstatus |= CIST_YPCALL; /* function can do error recovery */
|
|
luaD_call(L, c.func, nresults); /* do the call */
|
|
ci->callstatus &= ~CIST_YPCALL;
|
|
L->errfunc = ci->u.c.old_errfunc;
|
|
status = LUA_OK; /* if it is here, there were no errors */
|
|
}
|
|
adjustresults(L, nresults);
|
|
lua_unlock(L);
|
|
return status;
|
|
}
|
|
|
|
|
|
LUA_API int lua_load (lua_State *L, lua_Reader reader, void *data,
|
|
const char *chunkname, const char *mode) {
|
|
ZIO z;
|
|
int status;
|
|
lua_lock(L);
|
|
if (!chunkname) chunkname = "?";
|
|
luaZ_init(L, &z, reader, data);
|
|
status = luaD_protectedparser(L, &z, chunkname, mode);
|
|
if (status == LUA_OK) { /* no errors? */
|
|
LClosure *f = clLvalue(s2v(L->top - 1)); /* get newly created function */
|
|
if (f->nupvalues >= 1) { /* does it have an upvalue? */
|
|
/* get global table from registry */
|
|
Table *reg = hvalue(&G(L)->l_registry);
|
|
const TValue *gt = luaH_getint(reg, LUA_RIDX_GLOBALS);
|
|
/* set global table as 1st upvalue of 'f' (may be LUA_ENV) */
|
|
setobj(L, f->upvals[0]->v, gt);
|
|
luaC_barrier(L, f->upvals[0], gt);
|
|
}
|
|
}
|
|
lua_unlock(L);
|
|
return status;
|
|
}
|
|
|
|
|
|
LUA_API int lua_dump (lua_State *L, lua_Writer writer, void *data, int strip) {
|
|
int status;
|
|
TValue *o;
|
|
lua_lock(L);
|
|
api_checknelems(L, 1);
|
|
o = s2v(L->top - 1);
|
|
if (isLfunction(o))
|
|
status = luaU_dump(L, getproto(o), writer, data, strip);
|
|
else
|
|
status = 1;
|
|
lua_unlock(L);
|
|
return status;
|
|
}
|
|
|
|
|
|
LUA_API int lua_status (lua_State *L) {
|
|
return L->status;
|
|
}
|
|
|
|
|
|
/*
|
|
** Garbage-collection function
|
|
*/
|
|
LUA_API int lua_gc (lua_State *L, int what, ...) {
|
|
va_list argp;
|
|
int res = 0;
|
|
global_State *g = G(L);
|
|
lua_lock(L);
|
|
va_start(argp, what);
|
|
switch (what) {
|
|
case LUA_GCSTOP: {
|
|
g->gcrunning = 0;
|
|
break;
|
|
}
|
|
case LUA_GCRESTART: {
|
|
luaE_setdebt(g, 0);
|
|
g->gcrunning = 1;
|
|
break;
|
|
}
|
|
case LUA_GCCOLLECT: {
|
|
luaC_fullgc(L, 0);
|
|
break;
|
|
}
|
|
case LUA_GCCOUNT: {
|
|
/* GC values are expressed in Kbytes: #bytes/2^10 */
|
|
res = cast_int(gettotalbytes(g) >> 10);
|
|
break;
|
|
}
|
|
case LUA_GCCOUNTB: {
|
|
res = cast_int(gettotalbytes(g) & 0x3ff);
|
|
break;
|
|
}
|
|
case LUA_GCSTEP: {
|
|
int data = va_arg(argp, int);
|
|
l_mem debt = 1; /* =1 to signal that it did an actual step */
|
|
lu_byte oldrunning = g->gcrunning;
|
|
g->gcrunning = 1; /* allow GC to run */
|
|
if (data == 0) {
|
|
luaE_setdebt(g, 0); /* do a basic step */
|
|
luaC_step(L);
|
|
}
|
|
else { /* add 'data' to total debt */
|
|
debt = cast(l_mem, data) * 1024 + g->GCdebt;
|
|
luaE_setdebt(g, debt);
|
|
luaC_checkGC(L);
|
|
}
|
|
g->gcrunning = oldrunning; /* restore previous state */
|
|
if (debt > 0 && g->gcstate == GCSpause) /* end of cycle? */
|
|
res = 1; /* signal it */
|
|
break;
|
|
}
|
|
case LUA_GCSETPAUSE: {
|
|
int data = va_arg(argp, int);
|
|
res = getgcparam(g->gcpause);
|
|
setgcparam(g->gcpause, data);
|
|
break;
|
|
}
|
|
case LUA_GCSETSTEPMUL: {
|
|
int data = va_arg(argp, int);
|
|
res = getgcparam(g->gcstepmul);
|
|
setgcparam(g->gcstepmul, data);
|
|
break;
|
|
}
|
|
case LUA_GCISRUNNING: {
|
|
res = g->gcrunning;
|
|
break;
|
|
}
|
|
case LUA_GCGEN: {
|
|
int oldmode = g->gckind;
|
|
int minormul = va_arg(argp, int);
|
|
int majormul = va_arg(argp, int);
|
|
if (minormul != 0)
|
|
g->genminormul = minormul;
|
|
if (majormul != 0)
|
|
setgcparam(g->genmajormul, majormul);
|
|
luaC_changemode(L, KGC_GEN);
|
|
res = (oldmode == KGC_GEN) ? LUA_GCGEN : LUA_GCINC;
|
|
break;
|
|
}
|
|
case LUA_GCINC: {
|
|
int oldmode = g->gckind;
|
|
int pause = va_arg(argp, int);
|
|
int stepmul = va_arg(argp, int);
|
|
int stepsize = va_arg(argp, int);
|
|
if (pause != 0)
|
|
setgcparam(g->gcpause, pause);
|
|
if (stepmul != 0)
|
|
setgcparam(g->gcstepmul, stepmul);
|
|
if (stepsize != 0)
|
|
g->gcstepsize = stepsize;
|
|
luaC_changemode(L, KGC_INC);
|
|
res = (oldmode == KGC_GEN) ? LUA_GCGEN : LUA_GCINC;
|
|
break;
|
|
}
|
|
default: res = -1; /* invalid option */
|
|
}
|
|
va_end(argp);
|
|
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);
|
|
/* code unreachable; will unlock when control actually leaves the kernel */
|
|
return 0; /* to avoid warnings */
|
|
}
|
|
|
|
|
|
LUA_API int lua_next (lua_State *L, int idx) {
|
|
TValue *t;
|
|
int more;
|
|
lua_lock(L);
|
|
t = index2value(L, idx);
|
|
api_check(L, ttistable(t), "table expected");
|
|
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) {
|
|
luaV_concat(L, n);
|
|
}
|
|
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 */
|
|
luaC_checkGC(L);
|
|
lua_unlock(L);
|
|
}
|
|
|
|
|
|
LUA_API void lua_len (lua_State *L, int idx) {
|
|
TValue *t;
|
|
lua_lock(L);
|
|
t = index2value(L, idx);
|
|
luaV_objlen(L, L->top, t);
|
|
api_incr_top(L);
|
|
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);
|
|
u = luaS_newudata(L, size);
|
|
setuvalue(L, s2v(L->top), u);
|
|
api_incr_top(L);
|
|
luaC_checkGC(L);
|
|
lua_unlock(L);
|
|
return getudatamem(u);
|
|
}
|
|
|
|
|
|
|
|
static const char *aux_upvalue (TValue *fi, int n, TValue **val,
|
|
GCObject **owner) {
|
|
switch (ttype(fi)) {
|
|
case LUA_TCCL: { /* C closure */
|
|
CClosure *f = clCvalue(fi);
|
|
if (!(1 <= n && n <= f->nupvalues)) return NULL;
|
|
*val = &f->upvalue[n-1];
|
|
if (owner) *owner = obj2gco(f);
|
|
return "";
|
|
}
|
|
case LUA_TLCL: { /* Lua closure */
|
|
LClosure *f = clLvalue(fi);
|
|
TString *name;
|
|
Proto *p = f->p;
|
|
if (!(1 <= n && n <= p->sizeupvalues)) return NULL;
|
|
*val = f->upvals[n-1]->v;
|
|
if (owner) *owner = obj2gco(f->upvals[n - 1]);
|
|
name = p->upvalues[n-1].name;
|
|
return (name == NULL) ? "(*no name)" : getstr(name);
|
|
}
|
|
default: return NULL; /* not a closure */
|
|
}
|
|
}
|
|
|
|
|
|
LUA_API const char *lua_getupvalue (lua_State *L, int funcindex, int n) {
|
|
const char *name;
|
|
TValue *val = NULL; /* to avoid warnings */
|
|
lua_lock(L);
|
|
name = aux_upvalue(index2value(L, funcindex), n, &val, NULL);
|
|
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 = NULL; /* to avoid warnings */
|
|
GCObject *owner = NULL; /* to avoid warnings */
|
|
TValue *fi;
|
|
lua_lock(L);
|
|
fi = index2value(L, funcindex);
|
|
api_checknelems(L, 1);
|
|
name = aux_upvalue(fi, n, &val, &owner);
|
|
if (name) {
|
|
L->top--;
|
|
setobj(L, val, s2v(L->top));
|
|
luaC_barrier(L, owner, val);
|
|
}
|
|
lua_unlock(L);
|
|
return name;
|
|
}
|
|
|
|
|
|
static UpVal **getupvalref (lua_State *L, int fidx, int n, LClosure **pf) {
|
|
LClosure *f;
|
|
TValue *fi = index2value(L, fidx);
|
|
api_check(L, ttisLclosure(fi), "Lua function expected");
|
|
f = clLvalue(fi);
|
|
api_check(L, (1 <= n && n <= f->p->sizeupvalues), "invalid upvalue index");
|
|
if (pf) *pf = f;
|
|
return &f->upvals[n - 1]; /* get its upvalue pointer */
|
|
}
|
|
|
|
|
|
LUA_API void *lua_upvalueid (lua_State *L, int fidx, int n) {
|
|
TValue *fi = index2value(L, fidx);
|
|
switch (ttype(fi)) {
|
|
case LUA_TLCL: { /* lua closure */
|
|
return *getupvalref(L, fidx, n, NULL);
|
|
}
|
|
case LUA_TCCL: { /* C closure */
|
|
CClosure *f = clCvalue(fi);
|
|
api_check(L, 1 <= n && n <= f->nupvalues, "invalid upvalue index");
|
|
return &f->upvalue[n - 1];
|
|
}
|
|
default: {
|
|
api_check(L, 0, "closure expected");
|
|
return NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
LUA_API void lua_upvaluejoin (lua_State *L, int fidx1, int n1,
|
|
int fidx2, int n2) {
|
|
LClosure *f1;
|
|
UpVal **up1 = getupvalref(L, fidx1, n1, &f1);
|
|
UpVal **up2 = getupvalref(L, fidx2, n2, NULL);
|
|
*up1 = *up2;
|
|
luaC_objbarrier(L, f1, *up1);
|
|
}
|
|
|
|
|