private static void TraverseStack(GlobalState g, LuaState l)
{
StkId o, lim;
CallInfo ci;
MarkValue(g, Gt(l));
lim = l.top;
for (ci = l.base_ci[0]; ci < l.ci; CallInfo.Inc(ref ci))
{
LuaAssert(ci.top <= l.stack_last);
if (lim < ci.top)
{
lim = ci.top;
}
}
for (o = l.stack[0]; o < l.top; StkId.Inc(ref o))
{
MarkValue(g, o);
}
for (; o <= lim; StkId.Inc(ref o))
{
SetNilValue(o);
}
CheckStackSizes(l, lim);
}
public static int LuaDPosCall(LuaState L, StkId firstResult)
{
StkId res;
int wanted, i;
CallInfo ci;
if ((L.hookmask & LUA_MASKRET) != 0)
{
firstResult = CallRetHooks(L, firstResult);
}
ci = CallInfo.Dec(ref L.ci);
res = ci.func; /* res == final position of 1st result */
wanted = ci.nresults;
L.base_ = (ci - 1).base_; /* restore base */
L.savedpc = InstructionPtr.Assign((ci - 1).savedpc); /* restore savedpc */
/* move results to correct place */
for (i = wanted; i != 0 && firstResult < L.top; i--)
{
SetObj2S(L, res, firstResult);
res = res + 1;
firstResult = firstResult + 1;
}
while (i-- > 0)
{
SetNilValue(StkId.Inc(ref res));
}
L.top = res;
return(wanted - LUA_MULTRET); /* 0 iff wanted == LUA_MULTRET */
}
/* only ANSI way to check whether a pointer points to an array */
private static int IsInStack(CallInfo ci, TValue o)
{
StkId p;
for (p = ci.base_; p < ci.top; StkId.Inc(ref p))
{
if (o == p)
{
return(1);
}
}
return(0);
}
private static StkId AdjustVarArgs(LuaState L, Proto p, int actual)
{
int i;
int nfixargs = p.numparams;
Table htab = null;
StkId base_, fixed_;
for (; actual < nfixargs; ++actual)
{
SetNilValue(StkId.Inc(ref L.top));
}
#if LUA_COMPAT_VARARG
if ((p.is_vararg & VARARG_NEEDSARG) != 0) /* compat. with old-style vararg? */
{
int nvar = actual - nfixargs; /* number of extra arguments */
lua_assert(p.is_vararg & VARARG_HASARG);
luaC_checkGC(L);
luaD_checkstack(L, p.maxstacksize);
htab = luaH_new(L, nvar, 1); /* create `arg' table */
for (i = 0; i < nvar; i++) /* put extra arguments into `arg' table */
{
setobj2n(L, luaH_setnum(L, htab, i + 1), L.top - nvar + i);
}
/* store counter in field `n' */
setnvalue(luaH_setstr(L, htab, luaS_newliteral(L, "n")), cast_num(nvar));
}
#endif
/* move fixed parameters to final position */
fixed_ = L.top - actual; /* first fixed argument */
base_ = L.top; /* final position of first argument */
for (i = 0; i < nfixargs; i++)
{
SetObj2S(L, StkId.Inc(ref L.top), fixed_ + i);
SetNilValue(fixed_ + i);
}
/* add `arg' parameter */
if (htab != null)
{
StkId top = L.top;
StkId.Inc(ref L.top);
SetHValue(L, top, htab);
LuaAssert(IsWhite(obj2gco(htab)));
}
return(base_);
}
private static void stack_init(LuaState L1, LuaState L)
{
/* initialize CallInfo array */
L1.base_ci = LuaMNewVector <CallInfo>(L, BASICCISIZE);
L1.ci = L1.base_ci[0];
L1.size_ci = BASICCISIZE;
L1.end_ci = L1.base_ci[L1.size_ci - 1];
/* initialize stack array */
L1.stack = LuaMNewVector <TValue>(L, BASICSTACKSIZE + EXTRASTACK);
L1.stacksize = BASICSTACKSIZE + EXTRASTACK;
L1.top = L1.stack[0];
L1.stack_last = L1.stack[L1.stacksize - EXTRASTACK - 1];
/* initialize first ci */
L1.ci.func = L1.top;
SetNilValue(StkId.Inc(ref L1.top)); /* `function' entry for this `ci' */
L1.base_ = L1.ci.base_ = L1.top;
L1.ci.top = L1.top + LUA_MINSTACK;
}
public static void LuaSetTop(LuaState L, int idx)
{
LuaLock(L);
if (idx >= 0)
{
ApiCheck(L, idx <= L.stack_last - L.base_);
while (L.top < L.base_ + idx)
{
SetNilValue(StkId.Inc(ref L.top));
}
L.top = L.base_ + idx;
}
else
{
ApiCheck(L, -(idx + 1) <= (L.top - L.base_));
L.top += idx + 1; /* `subtract' index (index is negative) */
}
LuaUnlock(L);
}
public static void LuaXMove(LuaState from, LuaState to, int n)
{
int i;
if (from == to)
{
return;
}
LuaLock(to);
CheckNElements(from, n);
ApiCheck(from, G(from) == G(to));
ApiCheck(from, to.ci.top - to.top >= n);
from.top -= n;
for (i = 0; i < n; i++)
{
SetObj2S(to, StkId.Inc(ref to.top), from.top + i);
}
LuaUnlock(to);
}
public static void IncrTop(LuaState L)
{
LuaDCheckStack(L, 1);
StkId.Inc(ref L.top);
}
public static int LuaDPreCall(LuaState L, StkId func, int nresults)
{
LClosure cl;
ptrdiff_t funcr;
if (!TTIsFunction(func)) /* `func' is not a function? */
{
func = TryFuncTM(L, func); /* check the `function' tag method */
}
funcr = SaveStack(L, func);
cl = CLValue(func).l;
L.ci.savedpc = InstructionPtr.Assign(L.savedpc);
if (cl.isC == 0) /* Lua function? prepare its call */
{
CallInfo ci;
StkId st, base_;
Proto p = cl.p;
LuaDCheckStack(L, p.maxstacksize);
func = RestoreStack(L, funcr);
if (p.is_vararg == 0) /* no varargs? */
{
base_ = L.stack[func + 1];
if (L.top > base_ + p.numparams)
{
L.top = base_ + p.numparams;
}
}
else /* vararg function */
{
int nargs = L.top - func - 1;
base_ = AdjustVarArgs(L, p, nargs);
func = RestoreStack(L, funcr); /* previous call may change the stack */
}
ci = IncCI(L); /* now `enter' new function */
ci.func = func;
L.base_ = ci.base_ = base_;
ci.top = L.base_ + p.maxstacksize;
LuaAssert(ci.top <= L.stack_last);
L.savedpc = new InstructionPtr(p.code, 0); /* starting point */
ci.tailcalls = 0;
ci.nresults = nresults;
for (st = L.top; st < ci.top; StkId.Inc(ref st))
{
SetNilValue(st);
}
L.top = ci.top;
if ((L.hookmask & LUA_MASKCALL) != 0)
{
InstructionPtr.inc(ref L.savedpc); /* hooks assume 'pc' is already incremented */
LuaDCallHook(L, LUA_HOOKCALL, -1);
InstructionPtr.dec(ref L.savedpc); /* correct 'pc' */
}
return(PCRLUA);
}
else /* if is a C function, call it */
{
CallInfo ci;
int n;
LuaDCheckStack(L, LUA_MINSTACK); /* ensure minimum stack size */
ci = IncCI(L); /* now `enter' new function */
ci.func = RestoreStack(L, funcr);
L.base_ = ci.base_ = ci.func + 1;
ci.top = L.top + LUA_MINSTACK;
LuaAssert(ci.top <= L.stack_last);
ci.nresults = nresults;
if ((L.hookmask & LUA_MASKCALL) != 0)
{
LuaDCallHook(L, LUA_HOOKCALL, -1);
}
LuaUnlock(L);
n = CurrFunc(L).c.f(L); /* do the actual call */
LuaLock(L);
if (n < 0) /* yielding? */
{
return(PCRYIELD);
}
else
{
LuaDPosCall(L, L.top - n);
return(PCRC);
}
}
}
public static void IncrTop(LinyeeState L)
{
LinyeeDCheckStack(L, 1);
StkId.Inc(ref L.top);
}
public static void IncrementTop(LuaState L)
{
ApiCheck(L, L.top < L.ci.top);
StkId.Inc(ref L.top);
}
