private void HookLuaApi(SymbolResolver resolver)
{
Kernel32.LoadLibrary(Path.Combine(Util.ExtenderDirectory, "Lua.dll"));
var luaModule = Util.GetModule("Lua.dll");
var luaResolver = new DiaSymbolResolver(luaModule);
luaL_newstate = luaResolver.ResolveFunction <LuaLNewStateDelegate>("luaL_newstate");
luaopen_package = luaResolver.Resolve("luaopen_package");
luaopen_io = luaResolver.Resolve("luaopen_io");
luaopen_os = luaResolver.Resolve("luaopen_os");
db_sethook = luaResolver.Resolve("db_sethook");
using var sw = new StreamWriter("PatchLog.txt");
/* do not hook luaL_openlibs so that the engine will load its own implementation of
* luaopen_debug and luaopen_utf8
*/
var ignoreSymbols = new string[] {
"luaopen_debug",
"luaopen_utf8",
"luaL_openlibs"
};
var symbols = resolver.FindSymbolsMatching(new Regex("lua*"))
.Concat(resolver.FindSymbolsMatching(new Regex(@"\?lua*")))
.Where(symbol => !ignoreSymbols.Contains(symbol));
foreach (var symbol in symbols)
{
var source = resolver.Resolve(symbol);
if (!luaResolver.TryResolve(symbol, out var target))
{
RegisterErrorHook(symbol, source);
sw.WriteLine($"Could not find symbol {symbol} in lua.dll");
continue;
}
var asm = new string[] {
$"use64",
Utilities.GetAbsoluteJumpMnemonics(target, is64bit: true)
};
var hook = new AsmHook(asm, source.ToInt64(), AsmHookBehaviour.DoNotExecuteOriginal).Activate();
luahooks[symbol] = hook;
sw.WriteLine($"hooked lua function {symbol}. 0x{source.ToInt64():X8} -> 0x{target.ToInt64():X8}");
}
}
void LogEngineSymbols(SymbolResolver engineResolver)
{
var engineSymbols = engineResolver.FindSymbolsMatching(new Regex("lua*"));
File.WriteAllLines("engine_symbols.txt", engineSymbols);
Util.LoadExtenderLibrary("LuaHelper.dll");
var helperModule = Util.GetModule("LuaHelper.dll");
var helperResolver = new ExportResolver(helperModule);
var symbols = helperResolver.FindSymbolsMatching(new Regex("lua*"));
var missingSymbols = symbols.
Where(name => !engineResolver.TryResolve(name, out var _));
File.WriteAllLines("missing_symbols.txt", missingSymbols);
}