从 Lua 5.1 移植到 5.2

Question

我在将一些较旧的 Lua 5.1 代码移植到 Lua 5.2 时遇到了一些问题。我希望能够使用现有的 Lua 5.2 dll/lib，因此任何移植都需要使用现有的 Lua 5.2 API 完成。为了让它更复杂一点，我使用DllImport 来 P/Invoke 一些 Lua API 调用。这意味着所提供的任何#define 快​​捷方式都将不起作用。例如使用lua_pushglobaltable 是不可能的。大多数更新都是必需的，因为无法再访问LUA_REGISTRYINDEX。

到目前为止，我有以下内容：

---

1a) 替换

lua_pushstring(luaState, "tablename");
lua_settable(luaState, LUA_REGISTRYINDEX); // LUA_REGISTRYINDEX no longer accessible

1b) 有

lua_setglobal(luaState, "tablename");

---

2a) 替换

lua_pushstring(luaState, "tablename");
lua_gettable(luaState, LUA_REGISTRYINDEX); // LUA_REGISTRYINDEX no longer accessible

2b) 有

lua_getglobal(luaState, "tablename");

---

3a) 替换

lua_pushvalue(luaState, LUA_GLOBALSINDEX);

3b) 有

// not sure, something equivalent to lua_pushglobaltable(L)

---

4a) 替换

lua_replace(luaState, LUA_GLOBALSINDEX);

4b) 有

// I dont even have a guess here

---

5a) 替换

luaL_ref(luaState, (int)LuaIndexes.LUA_REGISTRYINDEX); // also luaL_unref

5b) 有

luaL_ref(luaState, <some arbitrary constant>); // this is probably wrong

---

6a) 替换

lua_rawgeti(luaState, LUA_REGISTRYINDEX, reference);

6b) 有

lua_rawgeti(luaState, <same arbitrary constant>, reference); // this is probably wrong

---

7a) 替换

lua_pcall(IntPtr luaState, int nArgs, int nResults, int errfunc);

7b) 有

lua_pcallk(IntPtr luaState, int nArgs, int nResults, int errfunc, int ctx, [MarshalAs(UnmanagedType.FunctionPtr)]LuaCSFunction function);
lua_pcallk(luaState, nArgs, nResults, errfunc, 0, null);

---

8a) 替换

lua_getfield(luaState, LUA_REGISTRYINDEX, meta);

8b) 有

luaL_setmetatable(IntPtr luaState, string meta);

---

9a) 替换

lua_rawset(luaState, LUA_REGISTRYINDEX);

9b) 有

lua_settable(luaState, -3);

现在一切都编译了，但是我得到了内存访问冲突异常，这意味着我可能错误地替换了一些东西。任何帮助将不胜感激。

Answer 1

我相信我已经设法升级了它，所以我将在下面添加我所做的和转换的详细信息。我在 LUA 低级 API 中创建了一个 C 包装器来导出我需要的功能：

1a) 替换

lua_settable(luaState, LUA_REGISTRYINDEX); // LUA_REGISTRYINDEX no longer accessible

1b) 有

lua_settablereg(luaState);

2a) 替换

lua_gettable(luaState, LUA_REGISTRYINDEX); // LUA_REGISTRYINDEX no longer accessible

2b) 有

lua_gettablereg(luaState);

3a) 替换

lua_pushvalue(luaState, LUA_GLOBALSINDEX);

3b) 有

lua_pushglobaltablefunction(luaState)

4a) 替换

lua_replace(luaState, LUA_GLOBALSINDEX);

4b) 有

lua_popglobaltablefunction(luaState)

5a) 替换

luaL_ref(luaState, (int)LuaIndexes.LUA_REGISTRYINDEX); // also luaL_unref

5b) 有

luaL_refreg(luaState); // also luaL_unrefreg

6a) 替换

lua_rawgeti(luaState, LUA_REGISTRYINDEX, reference);

6b) 有

lua_rawgetireg(luaState, reference);

7a) 替换

lua_pcall(luaState, nArgs, nResults, errfunc);

7b) 有

lua_pcalla(luaState, nArgs, nResults, errfunc);

8a) 替换

lua_getfield(luaState, LUA_REGISTRYINDEX, meta);

8b) 有

lua_getfieldreg(luaState, string meta);

9a) 替换

lua_rawset(luaState, LUA_REGISTRYINDEX);

9b) 有

lua_rawsetreg(luaState);

定义如下所示：

__declspec(dllexport) void lua_pushglobaltablefunction(lua_State *L) 
{
   lua_pushglobaltable(L);
}

__declspec(dllexport) void lua_popglobaltablefunction(lua_State *L) 
{
   lua_rawseti(L, LUA_REGISTRYINDEX, LUA_RIDX_GLOBALS);
}

__declspec(dllexport) int luaL_regref(lua_State *L) 
{
   return luaL_ref(L, LUA_REGISTRYINDEX);
}

__declspec(dllexport) void luaL_unregref(lua_State *L, int reference)
{
   luaL_unref(L, LUA_REGISTRYINDEX, reference);
}

__declspec(dllexport) void lua_settablereg(lua_State *L)
{
   lua_settable(L, LUA_REGISTRYINDEX);
}

__declspec(dllexport) void lua_gettablereg(lua_State *L)
{
   lua_gettable(L, LUA_REGISTRYINDEX);
}

__declspec(dllexport) void lua_rawsetreg(lua_State *L)
{
   lua_rawset(L, LUA_REGISTRYINDEX);
}

__declspec(dllexport) void lua_rawgetreg(lua_State *L)
{
   lua_rawget(L, LUA_REGISTRYINDEX);
}

__declspec(dllexport) void lua_rawgetireg(lua_State *L, int reference)
{
   lua_rawgeti(L, LUA_REGISTRYINDEX, reference);
}

__declspec(dllexport) void lua_getfieldreg(lua_State *L,const char *fieldname)
{
   lua_getfield(L, LUA_REGISTRYINDEX, fieldname);
}

__declspec(dllexport) int luaL_loadbuffername(lua_State *L,const char *buff, int size,const char * name)
{
   return luaL_loadbuffer(L,buff,size,name);
}

__declspec(dllexport) double lua_tonum(lua_State *L, int index)
{
   return lua_tonumber(L, index);
}

__declspec(dllexport) int lua_pcalla(lua_State *L,int nArgs,int nResults,int errfunc)
{
   return lua_pcall(L,nArgs,nResults,errfunc);
}