src/open.cpp

   1 // Copyright (c) 2003 Daniel Wallin and Arvid Norberg
   2
   3 // Permission is hereby granted, free of charge, to any person obtaining a
   4 // copy of this software and associated documentation files (the "Software"),
   5 // to deal in the Software without restriction, including without limitation
   6 // the rights to use, copy, modify, merge, publish, distribute, sublicense,
   7 // and/or sell copies of the Software, and to permit persons to whom the
   8 // Software is furnished to do so, subject to the following conditions:
   9
  10 // The above copyright notice and this permission notice shall be included
  11 // in all copies or substantial portions of the Software.
  12
  13 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
  14 // ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
  15 // TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
  16 // PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
  17 // SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
  18 // ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  19 // ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  20 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
  21 // OR OTHER DEALINGS IN THE SOFTWARE.
  22
  23 #define LUABIND_BUILDING
  24
  25 #include <luabind/lua_include.hpp>
  26
  27 #include <luabind/luabind.hpp>
  28 #include <luabind/function.hpp>
  29 #include <luabind/get_main_thread.hpp>
  30
  31 namespace luabind {
  32
  33 namespace
  34 {
  35
  36   int make_property(lua_State* L)
  37   {
  38       int args = lua_gettop(L);
  39
  40       if (args == 0 || args > 2)
  41       {
  42           lua_pushstring(L, "make_property() called with wrong number of arguments.");
  43           lua_error(L);
  44       }
  45
  46       if (args == 1)
  47           lua_pushnil(L);
  48
  49       lua_pushcclosure(L, &detail::property_tag, 2);
  50       return 1;
  51   }
  52
  53   int main_thread_tag;
  54
  55   int deprecated_super(lua_State* L)
  56   {
  57       lua_pushstring(L,
  58           "DEPRECATION: 'super' has been deprecated in favor of "
  59           "directly calling the base class __init() function. "
  60           "This error can be disabled by calling 'luabind::disable_super_deprecation()'."
  61       );
  62       lua_error(L);
  63
  64       return 0;
  65   }
  66
  67 } // namespace unnamed
  68
  69     LUABIND_API lua_State* get_main_thread(lua_State* L)
  70     {
  71         lua_pushlightuserdata(L, &main_thread_tag);
  72         lua_rawget(L, LUA_REGISTRYINDEX);
  73         lua_State* result = static_cast<lua_State*>(lua_touserdata(L, -1));
  74         lua_pop(L, 1);
  75
  76         if (!result)
  77             throw std::runtime_error("Unable to get main thread, luabind::open() not called?");
  78
  79         return result;
  80     }
  81
  82     LUABIND_API void open(lua_State* L)
  83     {
  84         bool is_main_thread = lua_pushthread(L) == 1;
  85         lua_pop(L, 1);
  86
  87         if (!is_main_thread)
  88         {
  89             throw std::runtime_error(
  90                 "luabind::open() must be called with the main thread "
  91                 "lua_State*"
  92             );
  93         }
  94
  95         // get the global class registry, or create one if it doesn't exist
  96         // (it's global within a lua state)
  97         detail::class_registry* r = 0;
  98
  99         // If you hit this assert it's because you have called luabind::open()
 100         // twice on the same lua_State.
 101         assert((detail::class_registry::get_registry(L) == 0)
 102             && "you cannot call luabind::open() twice");
 103
 104         lua_pushstring(L, "__luabind_classes");
 105         r = static_cast<detail::class_registry*>(
 106             lua_newuserdata(L, sizeof(detail::class_registry)));
 107
 108         // set gc metatable
 109         lua_newtable(L);
 110         lua_pushstring(L, "__gc");
 111         lua_pushcclosure(
 112             L
 113           , detail::garbage_collector_s<
 114                 detail::class_registry
 115             >::apply
 116           , 0);
 117
 118         lua_settable(L, -3);
 119         lua_setmetatable(L, -2);
 120
 121         new(r) detail::class_registry(L);
 122         lua_settable(L, LUA_REGISTRYINDEX);
 123
 124         // TODO this leaks.
 125         lua_pushstring(L, "__luabind_class_id_map");
 126         void* classes_storage = lua_newuserdata(L, sizeof(detail::class_id_map));
 127         detail::class_id_map* class_ids = new (classes_storage) detail::class_id_map;
 128         (void)class_ids;
 129         lua_settable(L, LUA_REGISTRYINDEX);
 130
 131         lua_pushstring(L, "__luabind_cast_graph");
 132         void* cast_graph_storage = lua_newuserdata(
 133             L, sizeof(detail::cast_graph));
 134         detail::cast_graph* graph = new (cast_graph_storage) detail::cast_graph;
 135         (void)graph;
 136         lua_settable(L, LUA_REGISTRYINDEX);
 137
 138         lua_pushstring(L, "__luabind_class_map");
 139         void* class_map_storage = lua_newuserdata(
 140             L, sizeof(detail::class_map));
 141         detail::class_map* classes = new (class_map_storage) detail::class_map;
 142         (void)classes;
 143         lua_settable(L, LUA_REGISTRYINDEX);
 144
 145         // add functions (class, cast etc...)
 146         lua_pushstring(L, "class");
 147         lua_pushcclosure(L, detail::create_class::stage1, 0);
 148         lua_settable(L, LUA_GLOBALSINDEX);
 149
 150         lua_pushstring(L, "property");
 151         lua_pushcclosure(L, &make_property, 0);
 152         lua_settable(L, LUA_GLOBALSINDEX);
 153
 154         lua_pushlightuserdata(L, &main_thread_tag);
 155         lua_pushlightuserdata(L, L);
 156         lua_rawset(L, LUA_REGISTRYINDEX);
 157
 158         lua_pushstring(L, "super");
 159         lua_pushcclosure(L, &deprecated_super, 0);
 160         lua_settable(L, LUA_GLOBALSINDEX);
 161     }
 162
 163 } // namespace luabind
 164