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Use inline ctors for GameObjectTypeWrapper, LuaMemberFunctionWrapper

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Drew C
2026-03-14 13:04:22 -05:00
parent 7deb2ff293
commit 67adfd1e08
4 changed files with 76 additions and 36 deletions
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50
functions/game_object_type.cpp
View File

@@ -8,6 +8,19 @@
// SmartPtr stores the raw pointer as its first member. // SmartPtr stores the raw pointer as its first member.
static constexpr int OFFSET_OBJECT = 0x70; static constexpr int OFFSET_OBJECT = 0x70;
// MSVC std::string layout (x64, MSVC 14.0+).
// Used to read the std::string at a known field offset within GameObjectTypeClass.
struct MSVCString {
union {
char buf[16]; // SSO buffer (up to 15 chars + null)
char* ptr; // heap pointer when capacity > 15
};
size_t size;
size_t capacity; // <= 15 means SSO, > 15 means heap
const char* c_str() const { return (capacity <= 15) ? buf : ptr; }
};
// MSVC std::wstring layout (x64, MSVC 14.0+). // MSVC std::wstring layout (x64, MSVC 14.0+).
// Used to read the wstring* returned by GameTextClass::Get. // Used to read the wstring* returned by GameTextClass::Get.
struct MSVCWString { struct MSVCWString {
@@ -31,11 +44,10 @@ static void* Lua_Get_Display_Name(void* this_wrapper, void* /*script*/, void* /*
if (!got_class) if (!got_class)
return nullptr; return nullptr;
// 2. Get the text ID string (e.g. "TEXT_UNIT_X_WING") via Get_Text_Name_ID. // 2. Read the TextNameID string directly from the GameObjectTypeClass field.
// The game's function constructs a std::string into our buffer via copy-ctor. // Get_Text_Name_ID() is always inlined by the compiler, so we use the field offset.
// Assumes shared CRT (both DLL and game link to vcruntime140.dll dynamically). MSVCString* text_name = (MSVCString*)((char*)got_class + g_text_name_id_offset);
std::string text_id; std::string text_id(text_name->c_str(), text_name->size);
pfn_get_text_name_id(got_class, &text_id);
// 3. Resolve the localized display name via TheGameText.Get(text_id, false). // 3. Resolve the localized display name via TheGameText.Get(text_id, false).
// Returns a pointer to an internal wstring (the translated text). // Returns a pointer to an internal wstring (the translated text).
@@ -64,26 +76,36 @@ static void* Lua_Get_Display_Name(void* this_wrapper, void* /*script*/, void* /*
void Register_GOTMembers(void* wrapper) void Register_GOTMembers(void* wrapper)
{ {
if (!pfn_lmfw_ctor || !pfn_register_member) if (!pfn_lua_uservar_ctor || !pfn_register_member)
return; return;
if (!pfn_get_text_name_id || !pfn_game_text_get || !g_the_game_text) if (!g_text_name_id_offset || !pfn_game_text_get || !g_the_game_text)
return; return;
if (!pfn_return_variable) if (!pfn_return_variable || !g_rvas || !g_rvas->lmfw_vftable)
return; return;
// Allocate a LuaMemberFunctionWrapper<GameObjectTypeWrapper> (0x88 bytes). const LuaRVAs* rvas = g_rvas;
void* lmfw = ::operator new(0x88);
// Allocate a LuaMemberFunctionWrapper<GameObjectTypeWrapper>.
void* lmfw = ::operator new(rvas->lmfw_alloc_size);
if (!lmfw) return; if (!lmfw) return;
memset(lmfw, 0, 0x88); memset(lmfw, 0, rvas->lmfw_alloc_size);
// Build the 16-byte pointer-to-member-function structure. // Initialize the LuaUserVar base class.
pfn_lua_uservar_ctor(lmfw, 0, false);
// Set the LuaMemberFunctionWrapper<> vftable.
*(uintptr_t*)lmfw = g_base + rvas->lmfw_vftable;
// Write the 16-byte pointer-to-member-function (PMF) into the MemberFunction field.
// MSVC x64 multiple-inheritance PMF: [8-byte func addr][8-byte this-adjustment]. // MSVC x64 multiple-inheritance PMF: [8-byte func addr][8-byte this-adjustment].
// this-adjustment is 0 (our function expects the full GameObjectTypeWrapper*). // this-adjustment is 0 (our function expects the full GameObjectTypeWrapper*).
alignas(8) uint8_t pmf[16] = {}; alignas(8) uint8_t pmf[16] = {};
*(uintptr_t*)pmf = (uintptr_t)&Lua_Get_Display_Name; *(uintptr_t*)pmf = (uintptr_t)&Lua_Get_Display_Name;
memcpy((char*)lmfw + rvas->lmfw_pmf_offset, pmf, 16);
// Construct the LuaMemberFunctionWrapper via the game's ctor. // Set the Object (wrapper pointer) and UseMaps flag.
pfn_lmfw_ctor(lmfw, wrapper, pmf, false); *(void**)((char*)lmfw + rvas->lmfw_object_offset) = wrapper;
*(bool*)((char*)lmfw + rvas->lmfw_usemaps_offset) = false;
// Register as a member callable via wrapper.Get_Display_Name() // Register as a member callable via wrapper.Get_Display_Name()
pfn_register_member(wrapper, "Get_Display_Name", lmfw); pfn_register_member(wrapper, "Get_Display_Name", lmfw);

24
lua_hook.cpp
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@@ -5,9 +5,9 @@
#include <cstring> #include <cstring>
#include <new> #include <new>
// Cached during init for CreateLuaValueString // Cached during init — used by CreateLuaValueString and Register_GOTMembers
static const LuaRVAs* g_rvas = nullptr; const LuaRVAs* g_rvas = nullptr;
static uintptr_t g_base = 0; uintptr_t g_base = 0;
// Resolved function pointers // Resolved function pointers
fn_lua_open real_lua_open = nullptr; fn_lua_open real_lua_open = nullptr;
@@ -30,8 +30,8 @@ fn_DebugPrint pfn_debug_print = nullptr;
fn_RegisterMember pfn_register_member = nullptr; fn_RegisterMember pfn_register_member = nullptr;
fn_ReturnVariable pfn_return_variable = nullptr; fn_ReturnVariable pfn_return_variable = nullptr;
fn_GotWrapperCtor real_got_wrapper_ctor = nullptr; fn_GotWrapperCtor real_got_wrapper_ctor = nullptr;
fn_LmfwCtor pfn_lmfw_ctor = nullptr; fn_LuaUserVarCtor pfn_lua_uservar_ctor = nullptr;
fn_GetTextNameId pfn_get_text_name_id = nullptr; size_t g_text_name_id_offset = 0;
fn_GameTextGet pfn_game_text_get = nullptr; fn_GameTextGet pfn_game_text_get = nullptr;
void* g_the_game_text = nullptr; void* g_the_game_text = nullptr;
@@ -133,10 +133,10 @@ bool LuaHook_Init() {
g_the_game_text = (void*)(base + rvas->the_game_text); g_the_game_text = (void*)(base + rvas->the_game_text);
if (rvas->get_string) if (rvas->get_string)
pfn_game_text_get = (fn_GameTextGet)(base + rvas->get_string); pfn_game_text_get = (fn_GameTextGet)(base + rvas->get_string);
if (rvas->got_get_text_name_id) if (rvas->got_text_name_id_offset)
pfn_get_text_name_id = (fn_GetTextNameId)(base + rvas->got_get_text_name_id); g_text_name_id_offset = rvas->got_text_name_id_offset;
if (rvas->got_lmfw_ctor) if (rvas->lua_uservar_ctor)
pfn_lmfw_ctor = (fn_LmfwCtor)(base + rvas->got_lmfw_ctor); pfn_lua_uservar_ctor = (fn_LuaUserVarCtor)(base + rvas->lua_uservar_ctor);
if (rvas->lua_newtable && rvas->lua_rawseti) { if (rvas->lua_newtable && rvas->lua_rawseti) {
pfn_newtable = (fn_lua_newtable)(base + rvas->lua_newtable); pfn_newtable = (fn_lua_newtable)(base + rvas->lua_newtable);
@@ -158,9 +158,9 @@ bool LuaHook_Init() {
} }
// Hook GameObjectTypeWrapper constructor to register custom member functions // Hook GameObjectTypeWrapper constructor to register custom member functions
if (rvas->got_wrapper_ctor && rvas->got_lmfw_ctor && if (rvas->got_wrapper_ctor && rvas->lmfw_vftable && pfn_lua_uservar_ctor &&
pfn_register_member && pfn_lmfw_ctor && pfn_register_member &&
pfn_get_text_name_id && pfn_game_text_get && g_the_game_text && g_text_name_id_offset && pfn_game_text_get && g_the_game_text &&
rvas->lua_value_string_vftable && pfn_return_variable) rvas->lua_value_string_vftable && pfn_return_variable)
{ {
void* got_ctor_target = (void*)(base + rvas->got_wrapper_ctor); void* got_ctor_target = (void*)(base + rvas->got_wrapper_ctor);

10
lua_hook.h
View File

@@ -26,8 +26,8 @@ typedef void (*fn_RegisterMember)(void* uservar, const char* name, void*
typedef void* (*fn_ReturnVariable)(void* uservar, void* lua_var); // LuaUserVar::Return_Variable(LuaVar*) -> LuaTable* typedef void* (*fn_ReturnVariable)(void* uservar, void* lua_var); // LuaUserVar::Return_Variable(LuaVar*) -> LuaTable*
// Game Object Type Wrapper internals // Game Object Type Wrapper internals
typedef void* (*fn_GotWrapperCtor)(void* this_wrapper); // GameObjectTypeWrapper::GameObjectTypeWrapper() typedef void* (*fn_GotWrapperCtor)(void* this_wrapper); // GameObjectTypeWrapper::GameObjectTypeWrapper()
typedef void* (*fn_LmfwCtor)(void* lmfw, void* wrapper, void* pmf, bool use_maps); // LuaMemberFunctionWrapper<GameObjectTypeWrapper>::ctor typedef void* (*fn_LuaUserVarCtor)(void* this_ptr, int param, bool flag); // LuaUserVar::LuaUserVar(int, bool)
typedef void* (*fn_GetTextNameId)(void* got_class, void* out_string); // GameObjectTypeClass::Get_Text_Name_ID() -- returns via hidden out-param // GameObjectTypeClass::TextNameID is accessed via field offset (always inlined by compiler)
typedef void* (*fn_GameTextGet)(void* game_text, void* text_id_str, bool insert); // GameTextClass::Get(basic_string*, bool) -- returns wstring* typedef void* (*fn_GameTextGet)(void* game_text, void* text_id_str, bool insert); // GameTextClass::Get(basic_string*, bool) -- returns wstring*
// Resolved function pointers (defined in lua_hook.cpp) // Resolved function pointers (defined in lua_hook.cpp)
@@ -51,10 +51,12 @@ extern fn_DebugPrint pfn_debug_print;
extern fn_RegisterMember pfn_register_member; extern fn_RegisterMember pfn_register_member;
extern fn_ReturnVariable pfn_return_variable; extern fn_ReturnVariable pfn_return_variable;
extern fn_GotWrapperCtor real_got_wrapper_ctor; extern fn_GotWrapperCtor real_got_wrapper_ctor;
extern fn_LmfwCtor pfn_lmfw_ctor; extern fn_LuaUserVarCtor pfn_lua_uservar_ctor;
extern fn_GetTextNameId pfn_get_text_name_id; extern size_t g_text_name_id_offset;
extern fn_GameTextGet pfn_game_text_get; extern fn_GameTextGet pfn_game_text_get;
extern void* g_the_game_text; extern void* g_the_game_text;
extern const LuaRVAs* g_rvas;
extern uintptr_t g_base;
constexpr int LUA_GLOBALSINDEX = -10001; constexpr int LUA_GLOBALSINDEX = -10001;

28
rvas.h
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@@ -37,8 +37,14 @@ struct LuaRVAs {
// --- Game Object Type Wrapper --- // --- Game Object Type Wrapper ---
uintptr_t got_wrapper_ctor; // GameObjectTypeWrapper::GameObjectTypeWrapper() uintptr_t got_wrapper_ctor; // GameObjectTypeWrapper::GameObjectTypeWrapper()
uintptr_t got_get_text_name_id; // GameObjectTypeClass::Get_Text_Name_ID() size_t got_text_name_id_offset; // offset of TextNameID (std::string) within GameObjectTypeClass
uintptr_t got_lmfw_ctor; // LuaMemberFunctionWrapper<GameObjectTypeWrapper>::LuaMemberFunctionWrapper<>() // LuaMemberFunctionWrapper<GameObjectTypeWrapper> layout (ctor always inlined)
uintptr_t lmfw_vftable; // LuaMemberFunctionWrapper<>::vftable
uintptr_t lua_uservar_ctor; // LuaUserVar::LuaUserVar(int, bool)
size_t lmfw_alloc_size; // allocation size of LuaMemberFunctionWrapper<>
size_t lmfw_pmf_offset; // offset of MemberFunction (16-byte PMF)
size_t lmfw_object_offset; // offset of Object (wrapper pointer)
size_t lmfw_usemaps_offset; // offset of UseMaps (bool)
// --- Debug --- // --- Debug ---
uintptr_t debug_print; // Debug_Print(char*) uintptr_t debug_print; // Debug_Print(char*)
@@ -81,8 +87,13 @@ constexpr LuaRVAs RVAs_StarWarsI = {
// --- Game Object Type Wrapper --- // --- Game Object Type Wrapper ---
0x004f6c9, // GameObjectTypeWrapper::GameObjectTypeWrapper() 0x004f6c9, // GameObjectTypeWrapper::GameObjectTypeWrapper()
0x007b747, // GameObjectTypeClass::Get_Text_Name_ID() 0x160, // GameObjectTypeClass::TextNameID field offset
0x0f08450, // LuaMemberFunctionWrapper<GameObjectTypeWrapper>::ctor 0x158a680, // LuaMemberFunctionWrapper<>::vftable
0x0074f55, // LuaUserVar::LuaUserVar
0x88, // LuaMemberFunctionWrapper<> allocation size
0x68, // MemberFunction offset
0x78, // Object offset
0x80, // UseMaps offset
// --- Debug --- // --- Debug ---
0x0476AE0, // Debug_Print 0x0476AE0, // Debug_Print
@@ -125,8 +136,13 @@ constexpr LuaRVAs RVAs_StarWarsG = {
// --- Game Object Type Wrapper --- // --- Game Object Type Wrapper ---
0x0604a10, // GameObjectTypeWrapper::GameObjectTypeWrapper() 0x0604a10, // GameObjectTypeWrapper::GameObjectTypeWrapper()
0, // GameObjectTypeClass::Get_Text_Name_ID() -- not mapped 0x120, // GameObjectTypeClass::TextNameID field offset
0, // LuaMemberFunctionWrapper<GameObjectTypeWrapper>::ctor -- not mapped 0x08ab770, // LuaMemberFunctionWrapper<>::vftable
0x0249c20, // LuaUserVar::LuaUserVar
0x48, // LuaMemberFunctionWrapper<> allocation size
0x28, // MemberFunction offset
0x38, // Object offset
0x40, // UseMaps offset
// --- Debug --- // --- Debug ---
0, // Debug_Print (not mapped) 0, // Debug_Print (not mapped)