int luaL_ref(LuaThread* L) {
LuaTable* registry = L->l_G->getRegistry();
LuaValue val = L->stack_.top_[-1];
L->stack_.pop();
if(val.isNil()) return LUA_REFNIL;
LuaValue ref1 = registry->get(LuaValue(freelist));
int ref = ref1.isInteger() ? ref1.getInteger() : 0;
if (ref != 0) { // any free element?
LuaValue temp = registry->get( LuaValue(ref) );
registry->set( LuaValue(freelist), temp );
registry->set( LuaValue(ref), val );
return ref;
}
else {
// no free elements, get a new reference.
ref = (int)registry->getLength() + 1;
registry->set( LuaValue(ref), val );
return ref;
}
}
void luaL_unref(LuaThread* L, int ref) {
THREAD_CHECK(L);
if(ref >= 0) {
LuaTable* registry = L->l_G->getRegistry();
LuaValue a = registry->get( LuaValue(freelist) );
registry->set( LuaValue(ref), a );
registry->set( LuaValue(freelist), LuaValue(ref) );
}
}
void luaL_openlibs (LuaThread *L) {
THREAD_CHECK(L);
LuaTable* loadedModules = L->l_G->getRegistryTable("_LOADED");
LuaTable* globals = L->l_G->getGlobals();
/* call open functions from 'loadedlibs' and set results to global table */
for (const luaL_Reg* lib = loadedlibs; lib->func; lib++) {
lib->func(L);
loadedModules->set(lib->name, L->stack_.at(-1) );
globals->set(lib->name, L->stack_.at(-1) );
L->stack_.pop(); /* remove lib */
}
}
int luaopen_os (LuaThread *L) {
THREAD_CHECK(L);
LuaTable* lib = new LuaTable();
for(const luaL_Reg* cursor = syslib; cursor->name; cursor++) {
lib->set( cursor->name, LuaValue(cursor->func) );
}
L->stack_.push(lib);
return 1;
}
static void collectvalidlines (LuaThread *L, LuaClosure *f) {
THREAD_CHECK(L);
if (f == NULL || f->isC) {
LuaResult result = L->stack_.push_reserve2(LuaValue::Nil());
handleResult(result);
}
else {
LuaTable* t = new LuaTable(); /* new table to store active lines */
LuaResult result = L->stack_.push_reserve2(LuaValue(t));
handleResult(result);
LuaValue v = LuaValue(true);
for (int i = 0; i < (int)f->proto_->lineinfo.size(); i++) {
/* for all lines with code */
LuaValue key(f->proto_->lineinfo[i]);
t->set(key, v); /* table[line] = true */
}
}
}