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Multiplatform Kotlin LuaJ port (LUA interpreter)
/*******************************************************************************
* Copyright (c) 2009 Luaj.org. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package org.luaj.vm2
import org.luaj.vm2.internal.*
/**
* Extension of [LuaFunction] which executes lua bytecode.
*
*
* A [LuaClosure] is a combination of a [Prototype]
* and a [LuaValue] to use as an environment for execution.
* Normally the [LuaValue] is a [Globals] in which case the environment
* will contain standard lua libraries.
*
*
*
* There are three main ways [LuaClosure] instances are created:
*
* * Construct an instance using [.LuaClosure]
* * Construct it indirectly by loading a chunk via [Globals.load]
* * Execute the lua bytecode [Lua.OP_CLOSURE] as part of bytecode processing
*
*
*
* To construct it directly, the [Prototype] is typically created via a compiler such as
* [org.luaj.vm2.compiler.LuaC]:
* `String script = "print( 'hello, world' )";
* InputStream is = new ByteArrayInputStream(script.getBytes());
* Prototype p = LuaC.instance.compile(is, "script");
* LuaValue globals = JsePlatform.standardGlobals();
* LuaClosure f = new LuaClosure(p, globals);
* f.call();
`
*
*
*
* To construct it indirectly, the [Globals.load] method may be used:
* `Globals globals = JsePlatform.standardGlobals();
* LuaFunction f = globals.load(new StringReader(script), "script");
* LuaClosure c = f.checkclosure(); // This may fail if LuaJC is installed.
* c.call();
`
*
*
*
* In this example, the "checkclosure()" may fail if direct lua-to-java-bytecode
* compiling using LuaJC is installed, because no LuaClosure is created in that case
* and the value returned is a [LuaFunction] but not a [LuaClosure].
*
*
* Since a [LuaClosure] is a [LuaFunction] which is a [LuaValue],
* all the value operations can be used directly such as:
*
* * [LuaValue.call]
* * [LuaValue.call]
* * [LuaValue.invoke]
* * [LuaValue.invoke]
* * [LuaValue.method]
* * [LuaValue.method]
* * [LuaValue.invokemethod]
* * [LuaValue.invokemethod]
* * ...
*
* @see LuaValue
*
* @see LuaFunction
*
* @see LuaValue.isclosure
* @see LuaValue.checkclosure
* @see LuaValue.optclosure
* @see LoadState
*
* @see Globals.compiler
*/
class LuaClosure
/** Create a closure around a Prototype with a specific environment.
* If the prototype has upvalues, the environment will be written into the first upvalue.
* @param p the Prototype to construct this Closure for.
* @param env the environment to associate with the closure.
*/
(val p: Prototype, env: LuaValue?) : LuaFunction() {
var upValues: Array = when {
p.upvalues == null || p.upvalues.isEmpty() -> NOUPVALUES
else -> arrayOfNulls(p.upvalues.size).also { it[0] = UpValue(arrayOf(env), 0) }
}
internal val globals: Globals? = if (env is Globals) env else null
override fun isclosure(): Boolean = true
override fun optclosure(defval: LuaClosure?): LuaClosure? = this
override fun checkclosure(): LuaClosure? = this
override fun getmetatable(): LuaValue? = LuaFunction.s_metatable
override fun tojstring(): String = "function: $p"
override fun call(): LuaValue {
val stack = arrayOfNulls(p.maxstacksize) as Array
for (i in 0 until p.numparams) stack[i] = LuaValue.NIL
return execute(stack, LuaValue.NONE).arg1()
}
override fun call(arg: LuaValue): LuaValue {
val stack = arrayOfNulls(p.maxstacksize) as Array
arraycopy(LuaValue.NILS, 0, stack, 0, p.maxstacksize)
for (i in 1 until p.numparams) stack[i] = LuaValue.NIL
when (p.numparams) {
0 -> return execute(stack, arg).arg1()
else -> {
stack[0] = arg
return execute(stack, LuaValue.NONE).arg1()
}
}
}
override fun call(arg1: LuaValue, arg2: LuaValue): LuaValue {
val stack = arrayOfNulls(p.maxstacksize) as Array
for (i in 2 until p.numparams) stack[i] = LuaValue.NIL
when (p.numparams) {
1 -> {
stack[0] = arg1
return execute(stack, arg2).arg1()
}
0 -> return execute(stack, if (p.is_vararg != 0) LuaValue.varargsOf(arg1, arg2) else LuaValue.NONE).arg1()
else -> {
stack[0] = arg1
stack[1] = arg2
return execute(stack, LuaValue.NONE).arg1()
}
}
}
override fun call(arg1: LuaValue, arg2: LuaValue, arg3: LuaValue): LuaValue {
val stack = arrayOfNulls(p.maxstacksize) as Array
for (i in 3 until p.numparams) stack[i] = LuaValue.NIL
return when (p.numparams) {
0 -> execute(stack, if (p.is_vararg != 0) LuaValue.varargsOf(arg1, arg2, arg3) else LuaValue.NONE).arg1()
1 -> {
stack[0] = arg1
execute(stack, if (p.is_vararg != 0) LuaValue.varargsOf(arg2, arg3) else LuaValue.NONE).arg1()
}
2 -> {
stack[0] = arg1
stack[1] = arg2
execute(stack, arg3).arg1()
}
else -> {
stack[0] = arg1
stack[1] = arg2
stack[2] = arg3
execute(stack, LuaValue.NONE).arg1()
}
}
}
override fun invoke(varargs: Varargs): Varargs = onInvoke(varargs).eval()
override fun onInvoke(varargs: Varargs): Varargs {
val stack = arrayOfNulls(p.maxstacksize) as Array
for (i in 0 until p.numparams) stack[i] = varargs.arg(i + 1)
return execute(stack, if (p.is_vararg != 0) varargs.subargs(p.numparams + 1) else LuaValue.NONE)
}
protected fun execute(stack: Array, varargs: Varargs): Varargs {
// loop through instructions
var i: Int
var a: Int
var b: Int
var c: Int
var pc = 0
var top = 0
var o: LuaValue
var v: Varargs = LuaValue.NONE
val code = p.code
val k = p.k
// upvalues are only possible when closures create closures
// TODO: use linked list.
val openups = if (p.p.size > 0) arrayOfNulls(stack.size) else null
// allow for debug hooks
if (globals != null && globals.debuglib != null)
globals.debuglib!!.onCall(this, varargs, stack)
// process instructions
try {
loop@while (true) {
if (globals != null && globals.debuglib != null)
globals.debuglib!!.onInstruction(pc, v, top)
// pull out instruction
i = code[pc]
a = i shr 6 and 0xff
// process the op code
when (i and 0x3f) {
Lua.OP_MOVE/* A B R(A):= R(B) */ -> {
stack[a] = stack[i.ushr(23)]
++pc
continue@loop
}
Lua.OP_LOADK/* A Bx R(A):= Kst(Bx) */ -> {
stack[a] = k[i.ushr(14)]
++pc
continue@loop
}
Lua.OP_LOADBOOL/* A B C R(A):= (Bool)B: if (C) pc++ */ -> {
stack[a] = if (i.ushr(23) != 0) LuaValue.TRUE else LuaValue.FALSE
if (i and (0x1ff shl 14) != 0)
++pc /* skip next instruction (if C) */
++pc
continue@loop
}
Lua.OP_LOADNIL /* A B R(A):= ...:= R(A+B):= nil */ -> {
b = i.ushr(23)
while (b-- >= 0)
stack[a++] = LuaValue.NIL
++pc
continue@loop
}
Lua.OP_GETUPVAL /* A B R(A):= UpValue[B] */ -> {
stack[a] = upValues[i.ushr(23)]!!.value!!
++pc
continue@loop
}
Lua.OP_GETTABUP /* A B C R(A) := UpValue[B][RK(C)] */ -> {
stack[a] = upValues[i.ushr(23)]!!.value!![if ((run { c = i shr 14 and 0x1ff; c }) > 0xff
) k[c and 0x0ff] else stack[c]]
++pc
continue@loop
}
Lua.OP_GETTABLE /* A B C R(A):= R(B)[RK(C)] */ -> {
stack[a] = stack[i.ushr(23)][if ((run { c = i shr 14 and 0x1ff; c }) > 0xff) k[c and 0x0ff] else stack[c]]
++pc
continue@loop
}
Lua.OP_SETTABUP /* A B C UpValue[A][RK(B)] := RK(C) */ -> {
upValues[a]!!.value!![if ((run { b = i.ushr(23); b }) > 0xff) k[b and 0x0ff] else stack[b]] =
if ((run { c = i shr 14 and 0x1ff; c }) > 0xff) k[c and 0x0ff] else stack[c]
++pc
continue@loop
}
Lua.OP_SETUPVAL /* A B UpValue[B]:= R(A) */ -> {
upValues[i.ushr(23)]?.value = stack[a]
++pc
continue@loop
}
Lua.OP_SETTABLE /* A B C R(A)[RK(B)]:= RK(C) */ -> {
stack[a][if ((run { b = i.ushr(23); b }) > 0xff) k[b and 0x0ff] else stack[b]] =
if ((run { c = i shr 14 and 0x1ff; c }) > 0xff) k[c and 0x0ff] else stack[c]
++pc
continue@loop
}
Lua.OP_NEWTABLE /* A B C R(A):= {} (size = B,C) */ -> {
stack[a] = LuaTable(i.ushr(23), i shr 14 and 0x1ff)
++pc
continue@loop
}
Lua.OP_SELF /* A B C R(A+1):= R(B): R(A):= R(B)[RK(C)] */ -> {
stack[a + 1] = (run { o = stack[i.ushr(23)]; o })
stack[a] = o[if ((run { c = i shr 14 and 0x1ff; c }) > 0xff) k[c and 0x0ff] else stack[c]]
++pc
continue@loop
}
Lua.OP_ADD /* A B C R(A):= RK(B) + RK(C) */ -> {
stack[a] = (if ((run { b = i.ushr(23); b }) > 0xff) k[b and 0x0ff] else stack[b]).add(
if ((run { c = i shr 14 and 0x1ff; c }) > 0xff) k[c and 0x0ff] else stack[c]
)
++pc
continue@loop
}
Lua.OP_SUB /* A B C R(A):= RK(B) - RK(C) */ -> {
stack[a] = (if ((run { b = i.ushr(23); b }) > 0xff) k[b and 0x0ff] else stack[b]).sub(
if ((run { c = i shr 14 and 0x1ff; c }) > 0xff) k[c and 0x0ff] else stack[c]
)
++pc
continue@loop
}
Lua.OP_MUL /* A B C R(A):= RK(B) * RK(C) */ -> {
stack[a] = (if ((run { b = i.ushr(23); b }) > 0xff) k[b and 0x0ff] else stack[b]).mul(
if ((run { c = i shr 14 and 0x1ff; c }) > 0xff) k[c and 0x0ff] else stack[c]
)
++pc
continue@loop
}
Lua.OP_DIV /* A B C R(A):= RK(B) / RK(C) */ -> {
stack[a] = (if ((run { b = i.ushr(23); b }) > 0xff) k[b and 0x0ff] else stack[b]).div(
if ((run { c = i shr 14 and 0x1ff; c }) > 0xff) k[c and 0x0ff] else stack[c]
)
++pc
continue@loop
}
Lua.OP_MOD /* A B C R(A):= RK(B) % RK(C) */ -> {
stack[a] = (if ((run { b = i.ushr(23); b }) > 0xff) k[b and 0x0ff] else stack[b]).mod(
if ((run { c = i shr 14 and 0x1ff; c }) > 0xff) k[c and 0x0ff] else stack[c]
)
++pc
continue@loop
}
Lua.OP_POW /* A B C R(A):= RK(B) ^ RK(C) */ -> {
stack[a] = (if ((run { b = i.ushr(23); b }) > 0xff) k[b and 0x0ff] else stack[b]).pow(
if ((run { c = i shr 14 and 0x1ff; c }) > 0xff) k[c and 0x0ff] else stack[c]
)
++pc
continue@loop
}
Lua.OP_UNM /* A B R(A):= -R(B) */ -> {
stack[a] = stack[i.ushr(23)].neg()
++pc
continue@loop
}
Lua.OP_NOT /* A B R(A):= not R(B) */ -> {
stack[a] = stack[i.ushr(23)].not()
++pc
continue@loop
}
Lua.OP_LEN /* A B R(A):= length of R(B) */ -> {
stack[a] = stack[i.ushr(23)].len()
++pc
continue@loop
}
Lua.OP_CONCAT /* A B C R(A):= R(B).. ... ..R(C) */ -> {
b = i.ushr(23)
c = i shr 14 and 0x1ff
run {
if (c > b + 1) {
var sb = stack[c].buffer()
while (--c >= b)
sb = stack[c].concat(sb)
stack[a] = sb.value()
} else {
stack[a] = stack[c - 1].concat(stack[c])
}
}
++pc
continue@loop
}
Lua.OP_JMP /* sBx pc+=sBx */ -> {
pc += i.ushr(14) - 0x1ffff
if (a > 0) {
--a
b = openups!!.size
while (--b >= 0)
if (openups[b] != null && openups[b]!!.index >= a) {
openups[b]!!.close()
openups[b] = null
}
}
++pc
continue@loop
}
Lua.OP_EQ /* A B C if ((RK(B) == RK(C)) ~= A) then pc++ */ -> {
if ((if ((run { b = i.ushr(23); b }) > 0xff) k[b and 0x0ff] else stack[b]).eq_b(
if ((run { c = i shr 14 and 0x1ff; c }) > 0xff) k[c and 0x0ff] else stack[c]
) != (a != 0)
)
++pc
++pc
continue@loop
}
Lua.OP_LT /* A B C if ((RK(B) < RK(C)) ~= A) then pc++ */ -> {
if ((if ((run { b = i.ushr(23); b }) > 0xff) k[b and 0x0ff] else stack[b]).lt_b(
if ((run { c = i shr 14 and 0x1ff; c }) > 0xff) k[c and 0x0ff] else stack[c]
) != (a != 0)
)
++pc
++pc
continue@loop
}
Lua.OP_LE /* A B C if ((RK(B) <= RK(C)) ~= A) then pc++ */ -> {
if ((if ((run { b = i.ushr(23); b }) > 0xff) k[b and 0x0ff] else stack[b]).lteq_b(
if ((run { c = i shr 14 and 0x1ff; c }) > 0xff) k[c and 0x0ff] else stack[c]
) != (a != 0)
)
++pc
++pc
continue@loop
}
Lua.OP_TEST /* A C if not (R(A) <=> C) then pc++ */ -> {
if (stack[a].toboolean() != (i and (0x1ff shl 14) != 0))
++pc
++pc
continue@loop
}
Lua.OP_TESTSET /* A B C if (R(B) <=> C) then R(A):= R(B) else pc++ */ -> {
/* note: doc appears to be reversed */
if ((run { o = stack[i.ushr(23)]; o }).toboolean() != (i and (0x1ff shl 14) != 0))
++pc
else
stack[a] = o // TODO: should be sBx?
++pc
continue@loop
}
Lua.OP_CALL /* A B C R(A), ... ,R(A+C-2):= R(A)(R(A+1), ... ,R(A+B-1)) */ -> when (i and (Lua.MASK_B or Lua.MASK_C)) {
1 shl Lua.POS_B or (0 shl Lua.POS_C) -> {
v = stack[a].invoke(LuaValue.NONE)
top = a + v.narg()
++pc
continue@loop
}
2 shl Lua.POS_B or (0 shl Lua.POS_C) -> {
v = stack[a].invoke(stack[a + 1])
top = a + v.narg()
++pc
continue@loop
}
1 shl Lua.POS_B or (1 shl Lua.POS_C) -> {
stack[a].call()
++pc
continue@loop
}
2 shl Lua.POS_B or (1 shl Lua.POS_C) -> {
stack[a].call(stack[a + 1])
++pc
continue@loop
}
3 shl Lua.POS_B or (1 shl Lua.POS_C) -> {
stack[a].call(stack[a + 1], stack[a + 2])
++pc
continue@loop
}
4 shl Lua.POS_B or (1 shl Lua.POS_C) -> {
stack[a].call(stack[a + 1], stack[a + 2], stack[a + 3])
++pc
continue@loop
}
1 shl Lua.POS_B or (2 shl Lua.POS_C) -> {
stack[a] = stack[a].call()
++pc
continue@loop
}
2 shl Lua.POS_B or (2 shl Lua.POS_C) -> {
stack[a] = stack[a].call(stack[a + 1])
++pc
continue@loop
}
3 shl Lua.POS_B or (2 shl Lua.POS_C) -> {
stack[a] = stack[a].call(stack[a + 1], stack[a + 2])
++pc
continue@loop
}
4 shl Lua.POS_B or (2 shl Lua.POS_C) -> {
stack[a] = stack[a].call(stack[a + 1], stack[a + 2], stack[a + 3])
++pc
continue@loop
}
else -> {
b = i.ushr(23)
c = i shr 14 and 0x1ff
v = stack[a].invoke(
if (b > 0)
LuaValue.varargsOf(stack, a + 1, b - 1)
else
// exact arg count
LuaValue.varargsOf(stack, a + 1, top - v.narg() - (a + 1), v)
) // from prev top
if (c > 0) {
v.copyto(stack, a, c - 1)
v = LuaValue.NONE
} else {
top = a + v.narg()
v = v.dealias()
}
++pc
continue@loop
}
}
Lua.OP_TAILCALL /* A B C return R(A)(R(A+1), ... ,R(A+B-1)) */ -> when (i and Lua.MASK_B) {
1 shl Lua.POS_B -> return TailcallVarargs(stack[a], LuaValue.NONE)
2 shl Lua.POS_B -> return TailcallVarargs(stack[a], stack[a + 1])
3 shl Lua.POS_B -> return TailcallVarargs(
stack[a],
LuaValue.varargsOf(stack[a + 1], stack[a + 2])
)
4 shl Lua.POS_B -> return TailcallVarargs(
stack[a],
LuaValue.varargsOf(stack[a + 1], stack[a + 2], stack[a + 3])
)
else -> {
b = i.ushr(23)
v = if (b > 0)
LuaValue.varargsOf(stack, a + 1, b - 1)
else
// exact arg count
LuaValue.varargsOf(stack, a + 1, top - v.narg() - (a + 1), v) // from prev top
return TailcallVarargs(stack[a], v)
}
}
Lua.OP_RETURN /* A B return R(A), ... ,R(A+B-2) (see note) */ -> {
b = i.ushr(23)
when (b) {
0 -> return LuaValue.varargsOf(stack, a, top - v.narg() - a, v)
1 -> return LuaValue.NONE
2 -> return stack[a]
else -> return LuaValue.varargsOf(stack, a, b - 1)
}
}
Lua.OP_FORLOOP /* A sBx R(A)+=R(A+2): if R(A) {
run {
val limit = stack[a + 1]
val step = stack[a + 2]
val idx = step.add(stack[a])
if (if (step.gt_b(0)) idx.lteq_b(limit) else idx.gteq_b(limit)) {
stack[a] = idx
stack[a + 3] = idx
pc += i.ushr(14) - 0x1ffff
}
}
++pc
continue@loop
}
Lua.OP_FORPREP /* A sBx R(A)-=R(A+2): pc+=sBx */ -> {
run {
val init = stack[a].checknumber("'for' initial value must be a number")
val limit = stack[a + 1].checknumber("'for' limit must be a number")
val step = stack[a + 2].checknumber("'for' step must be a number")
stack[a] = init.sub(step)
stack[a + 1] = limit
stack[a + 2] = step
pc += i.ushr(14) - 0x1ffff
}
++pc
continue@loop
}
Lua.OP_TFORCALL /* A C R(A+3), ... ,R(A+2+C) := R(A)(R(A+1), R(A+2)); */ -> {
v = stack[a].invoke(LuaValue.varargsOf(stack[a + 1], stack[a + 2]))
c = i shr 14 and 0x1ff
while (--c >= 0)
stack[a + 3 + c] = v.arg(c + 1)
v = LuaValue.NONE
++pc
continue@loop
}
Lua.OP_TFORLOOP /* A sBx if R(A+1) ~= nil then { R(A)=R(A+1); pc += sBx */ -> {
if (!stack[a + 1].isnil()) { /* continue loop? */
stack[a] = stack[a + 1] /* save control varible. */
pc += i.ushr(14) - 0x1ffff
}
++pc
continue@loop
}
Lua.OP_SETLIST /* A B C R(A)[(C-1)*FPF+i]:= R(A+i), 1 <= i <= B */ -> {
run {
if ((run { c = i shr 14 and 0x1ff; c }) == 0)
c = code[++pc]
val offset = (c - 1) * Lua.LFIELDS_PER_FLUSH
o = stack[a]
if ((run { b = i.ushr(23); b }) == 0) {
b = top - a - 1
val m = b - v.narg()
var j = 1
while (j <= m) {
o[offset + j] = stack[a + j]
j++
}
while (j <= b) {
o[offset + j] = v.arg(j - m)
j++
}
} else {
o.presize(offset + b)
for (j in 1..b)
o[offset + j] = stack[a + j]
}
}
++pc
continue@loop
}
Lua.OP_CLOSURE /* A Bx R(A):= closure(KPROTO[Bx]) */ -> {
run {
val newp = p.p[i.ushr(14)]
val ncl = LuaClosure(newp, globals)
val uv = newp.upvalues
var j = 0
val nup = uv.size
while (j < nup) {
if (uv[j].instack)
/* upvalue refes to local variable? */
ncl.upValues[j] = findupval(stack as Array, uv[j].idx, openups!!)
else
/* get upvalue from enclosing function */
ncl.upValues[j] = upValues[uv[j].idx.toInt()]
++j
}
stack[a] = ncl
}
++pc
continue@loop
}
Lua.OP_VARARG /* A B R(A), R(A+1), ..., R(A+B-1) = vararg */ -> {
b = i.ushr(23)
if (b == 0) {
top = a + (run { b = varargs.narg(); b })
v = varargs
} else {
for (j in 1 until b)
stack[a + j - 1] = varargs.arg(j)
}
++pc
continue@loop
}
Lua.OP_EXTRAARG -> throw IllegalArgumentException("Uexecutable opcode: OP_EXTRAARG")
else -> throw IllegalArgumentException("Illegal opcode: " + (i and 0x3f))
}
++pc
}
} catch (le: LuaError) {
if (le.traceback == null) processErrorHooks(le, p, pc)
throw le
} catch (e: Exception) {
val le = LuaError(e)
processErrorHooks(le, p, pc)
throw le
} finally {
if (openups != null) {
var u = openups.size
while (--u >= 0) if (openups[u] != null) openups[u]!!.close()
}
if (globals != null && globals.debuglib != null) globals.debuglib!!.onReturn()
}
}
/**
* Run the error hook if there is one
* @param msg the message to use in error hook processing.
*/
internal fun errorHook(msg: String, level: Int): String {
if (globals == null) return msg
val r = globals.running
if (r.errorfunc == null) return if (globals.debuglib != null) msg + "\n" + globals.debuglib!!.traceback(level) else msg
val e = r.errorfunc
r.errorfunc = null
return try {
e!!.call(LuaValue.valueOf(msg)).tojstring()
} catch (t: Throwable) {
"error in error handling"
} finally {
r.errorfunc = e
}
}
private fun processErrorHooks(le: LuaError, p: Prototype, pc: Int) {
le.fileline = ((if (p.source != null) p.source.tojstring() else "?") + ":" + if (p.lineinfo != null && pc >= 0 && pc < p.lineinfo.size) p.lineinfo[pc].toString() else "?")
le.traceback = errorHook(le.message!!, le.level)
}
private fun findupval(stack: Array, idx: Short, openups: Array): UpValue? {
val n = openups.size
for (i in 0 until n) if (openups[i] != null && openups[i]!!.index == idx.toInt()) return openups[i]
for (i in 0 until n) if (openups[i] == null) return UpValue(stack, idx.toInt()).also { openups[i] = it }
LuaValue.error("No space for upvalue")
return null
}
protected fun getUpvalue(i: Int): LuaValue? = upValues[i]?.value
protected fun setUpvalue(i: Int, v: LuaValue) { upValues[i]?.value = v }
override fun name(): String = "<" + p.shortsource() + ":" + p.linedefined + ">"
companion object {
private val NOUPVALUES = arrayOfNulls(0)
}
}