src/function.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 #include <luabind/lua_include.hpp>
  24
  25 #include <luabind/config.hpp>
  26 #include <luabind/luabind.hpp>
  27 #include <luabind/exception_handler.hpp>
  28
  29 namespace luabind { namespace detail { namespace free_functions {
  30
  31     void function_rep::add_overload(overload_rep const& o)
  32     {
  33         m_overloads.push_back(o);
  34     }
  35
  36     int function_dispatcher(lua_State* L)
  37     {
  38         function_rep* rep = static_cast<function_rep*>(
  39             lua_touserdata(L, lua_upvalueindex(1))
  40         );
  41
  42         bool ambiguous = false;
  43         int min_match = std::numeric_limits<int>::max();
  44         int match_index = -1;
  45         bool ret;
  46
  47 #ifdef LUABIND_NO_ERROR_CHECKING
  48         if (rep->overloads().size() == 1)
  49         {
  50             match_index = 0;
  51         }
  52         else
  53         {
  54 #endif
  55             int num_params = lua_gettop(L);
  56             ret = find_best_match(
  57                 L
  58               , &rep->overloads().front()
  59               , (int)rep->overloads().size()
  60               , sizeof(overload_rep)
  61               , ambiguous
  62               , min_match
  63               , match_index
  64               , num_params
  65             );
  66 #ifdef LUABIND_NO_ERROR_CHECKING
  67         }
  68 #else
  69         if (!ret)
  70         {
  71             // this bock is needed to make sure the std::string is destructed
  72             {
  73                 std::string msg = "no match for function call '";
  74                 msg += rep->name();
  75                 msg += "' with the parameters (";
  76                 msg += stack_content_by_name(L, 1);
  77                 msg += ")\ncandidates are:\n";
  78
  79                 msg += get_overload_signatures(
  80                     L
  81                   , rep->overloads().begin()
  82                   , rep->overloads().end()
  83                   , rep->name()
  84                 );
  85
  86                 lua_pushstring(L, msg.c_str());
  87             }
  88
  89             lua_error(L);
  90         }
  91
  92         if (ambiguous)
  93         {
  94             // this bock is needed to make sure the std::string is destructed
  95             {
  96                 std::string msg = "call of overloaded function '";
  97                 msg += rep->name();
  98                 msg += "(";
  99                 msg += stack_content_by_name(L, 1);
 100                 msg += ") is ambiguous\nnone of the overloads "
 101                        "have a best conversion:";
 102
 103                 std::vector<overload_rep_base const*> candidates;
 104                 find_exact_match(
 105                     L
 106                   , &rep->overloads().front()
 107                   , (int)rep->overloads().size()
 108                   , sizeof(overload_rep)
 109                   , min_match
 110                   , num_params
 111                   , candidates
 112                 );
 113
 114                 msg += get_overload_signatures_candidates(
 115                     L
 116                   , candidates.begin()
 117                   , candidates.end()
 118                   , rep->name()
 119                 );
 120
 121                 lua_pushstring(L, msg.c_str());
 122             }
 123             lua_error(L);
 124         }
 125 #endif
 126         overload_rep const& ov_rep = rep->overloads()[match_index];
 127
 128 #ifndef LUABIND_NO_EXCEPTIONS
 129         try
 130         {
 131 #endif
 132             return ov_rep.call(L, ov_rep.fun);
 133 #ifndef LUABIND_NO_EXCEPTIONS
 134         }
 135         catch (...)
 136         {
 137             detail::handle_exception_aux(L);
 138         }
 139         // we can only reach this line if an exception was thrown
 140         lua_error(L);
 141         return 0; // will never be reached
 142 #endif
 143     }
 144
 145 }}} // namespace luabind::detail::free_functions
 146