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   int destroy_class_id_map(lua_State* L)
  68   {
  69       detail::class_id_map* m =
  70           (detail::class_id_map*)lua_touserdata(L, 1);
  71       m->~class_id_map();
  72       return 0;
  73   };
  74
  75   int destroy_cast_graph(lua_State* L)
  76   {
  77       detail::cast_graph* g =
  78           (detail::cast_graph*)lua_touserdata(L, 1);
  79       g->~cast_graph();
  80       return 0;
  81   };
  82
  83   int destroy_class_map(lua_State* L)
  84   {
  85       detail::class_map* m =
  86           (detail::class_map*)lua_touserdata(L, 1);
  87       m->~class_map();
  88       return 0;
  89   };
  90
  91 } // namespace unnamed
  92
  93     LUABIND_API lua_State* get_main_thread(lua_State* L)
  94     {
  95         lua_pushlightuserdata(L, &main_thread_tag);
  96         lua_rawget(L, LUA_REGISTRYINDEX);
  97         lua_State* result = static_cast<lua_State*>(lua_touserdata(L, -1));
  98         lua_pop(L, 1);
  99
 100         if (!result)
 101             throw std::runtime_error("Unable to get main thread, luabind::open() not called?");
 102
 103         return result;
 104     }
 105
 106     LUABIND_API void open(lua_State* L)
 107     {
 108         bool is_main_thread = lua_pushthread(L) == 1;
 109         lua_pop(L, 1);
 110
 111         if (!is_main_thread)
 112         {
 113             throw std::runtime_error(
 114                 "luabind::open() must be called with the main thread "
 115                 "lua_State*"
 116             );
 117         }
 118
 119         // get the global class registry, or create one if it doesn't exist
 120         // (it's global within a lua state)
 121         detail::class_registry* r = 0;
 122
 123         // If you hit this assert it's because you have called luabind::open()
 124         // twice on the same lua_State.
 125         assert((detail::class_registry::get_registry(L) == 0)
 126             && "you cannot call luabind::open() twice");
 127
 128         lua_pushstring(L, "__luabind_classes");
 129         r = static_cast<detail::class_registry*>(
 130             lua_newuserdata(L, sizeof(detail::class_registry)));
 131
 132         // set gc metatable
 133         lua_newtable(L);
 134         lua_pushstring(L, "__gc");
 135         lua_pushcclosure(
 136             L
 137           , detail::garbage_collector_s<
 138                 detail::class_registry
 139             >::apply
 140           , 0);
 141
 142         lua_settable(L, -3);
 143         lua_setmetatable(L, -2);
 144
 145         new(r) detail::class_registry(L);
 146         lua_settable(L, LUA_REGISTRYINDEX);
 147
 148         lua_pushstring(L, "__luabind_class_id_map");
 149         void* classes_storage = lua_newuserdata(L, sizeof(detail::class_id_map));
 150         detail::class_id_map* class_ids = new (classes_storage) detail::class_id_map;
 151         (void)class_ids;
 152
 153         lua_newtable(L);
 154         lua_pushcclosure(L, &destroy_class_id_map, 0);
 155         lua_setfield(L, -2, "__gc");
 156         lua_setmetatable(L, -2);
 157
 158         lua_settable(L, LUA_REGISTRYINDEX);
 159
 160         lua_pushstring(L, "__luabind_cast_graph");
 161         void* cast_graph_storage = lua_newuserdata(
 162             L, sizeof(detail::cast_graph));
 163         detail::cast_graph* graph = new (cast_graph_storage) detail::cast_graph;
 164         (void)graph;
 165
 166         lua_newtable(L);
 167         lua_pushcclosure(L, &destroy_cast_graph, 0);
 168         lua_setfield(L, -2, "__gc");
 169         lua_setmetatable(L, -2);
 170
 171         lua_settable(L, LUA_REGISTRYINDEX);
 172
 173         lua_pushstring(L, "__luabind_class_map");
 174         void* class_map_storage = lua_newuserdata(
 175             L, sizeof(detail::class_map));
 176         detail::class_map* classes = new (class_map_storage) detail::class_map;
 177         (void)classes;
 178
 179         lua_newtable(L);
 180         lua_pushcclosure(L, &destroy_class_map, 0);
 181         lua_setfield(L, -2, "__gc");
 182         lua_setmetatable(L, -2);
 183
 184         lua_settable(L, LUA_REGISTRYINDEX);
 185
 186         // add functions (class, cast etc...)
 187         lua_pushstring(L, "class");
 188         lua_pushcclosure(L, detail::create_class::stage1, 0);
 189         lua_settable(L, LUA_GLOBALSINDEX);
 190
 191         lua_pushstring(L, "property");
 192         lua_pushcclosure(L, &make_property, 0);
 193         lua_settable(L, LUA_GLOBALSINDEX);
 194
 195         lua_pushlightuserdata(L, &main_thread_tag);
 196         lua_pushlightuserdata(L, L);
 197         lua_rawset(L, LUA_REGISTRYINDEX);
 198
 199         lua_pushstring(L, "super");
 200         lua_pushcclosure(L, &deprecated_super, 0);
 201         lua_settable(L, LUA_GLOBALSINDEX);
 202     }
 203
 204 } // namespace luabind
 205