lua: preallocate tables with appropriate capacities

app/dns/lua.go

@@ -52,9 +52,9 @@ func luaServers(s *DNS) []luaDNSServer {
 
 func registerLua(L *lua.LState, servers []luaDNSServer, client featureDNS.Client) {
 	L.PreloadModule("xray.dns", func(L *lua.LState) int {
-		serverList := L.NewTable()
+		serverList := L.CreateTable(len(servers), 0)
 		for i, client := range servers {
-			server := L.NewTable()
+			server := L.CreateTable(0, 2)
 
 			server.RawSetString("ID", lua.LString(client.id))
 
@@ -90,7 +90,7 @@ func registerLua(L *lua.LState, servers []luaDNSServer, client featureDNS.Client
 			serverList.RawSetInt(i+1, server)
 		}
 
-		module := L.NewTable()
+		module := L.CreateTable(0, 2)
 		if servers != nil {
 			module.RawSetString("Servers", serverList)
 		}

app/router/lua.go

@@ -21,7 +21,7 @@ func (r *Router) RegisterLua(L *lua.LState) {
 	registerLuaContext(L)
 
 	L.PreloadModule("xray.router", func(L *lua.LState) int {
-		module := L.NewTable()
+		module := L.CreateTable(0, 7)
 
 		module.RawSetString("NetworkUnknown", lua.LNumber(net.Network_Unknown))
 		module.RawSetString("NetworkTCP", lua.LNumber(net.Network_TCP))
@@ -73,7 +73,7 @@ func registerLuaContext(L *lua.LState) {
 		}
 		return 1
 	}))
-	methods := L.NewTable()
+	methods := L.CreateTable(0, 4)
 	L.SetFuncs(methods, map[string]lua.LGFunction{
 		"GetSourceIPs": func(L *lua.LState) int {
 			xlua.PushUserData(L, checkLuaContext(L).GetSourceIPs())

common/geodata/lua.go

@@ -23,7 +23,7 @@ var (
 // RegisterLua makes xray.geodata available to require in an LState.
 func RegisterLua(L *lua.LState) {
 	L.PreloadModule("xray.geodata", func(L *lua.LState) int {
-		module := L.NewTable()
+		module := L.CreateTable(0, 2)
 
 		module.RawSetString("BuildDomainMatcher", L.NewFunction(func(L *lua.LState) int {
 			parsed, err := ParseDomainRules(luaRules(L), Domain_Domain)

common/log/lua.go

@@ -10,7 +10,7 @@ import (
 // RegisterLua makes xray.log available to require in an LState.
 func RegisterLua(L *lua.LState) {
 	L.PreloadModule("xray.log", func(L *lua.LState) int {
-		module := L.NewTable()
+		module := L.CreateTable(0, 4)
 		var source, prefix string // cache
 		for name, severity := range map[string]Severity{
 			"Debug":   Severity_Debug,