src/pcall.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/detail/pcall.hpp>
  24 #include <luabind/error.hpp>
  25 #include <luabind/lua_include.hpp>
  26
  27 namespace luabind { namespace detail
  28 {
  29         int pcall(lua_State *L, int nargs, int nresults)
  30         {
  31                 pcall_callback_fun e = get_pcall_callback();
  32                 int en = 0;
  33                 if ( e )
  34                 {
  35                         int base = lua_gettop(L) - nargs;
  36                         lua_pushcfunction(L, e);
  37                         lua_insert(L, base);  // push pcall_callback under chunk and args
  38                         en = base;
  39                 }
  40                 int result = lua_pcall(L, nargs, nresults, en);
  41                 if ( en )
  42                         lua_remove(L, en);  // remove pcall_callback
  43                 return result;
  44         }
  45
  46         int resume_impl(lua_State *L, int nargs, int)
  47         {
  48 #if LUA_VERSION_NUM >= 501
  49                 // Lua 5.1 added  LUA_YIELD as a possible return value,
  50                 // this was causing crashes, because the caller expects 0 on success.
  51                 int res = lua_resume(L, nargs);
  52                 return (res == LUA_YIELD) ? 0 : res;
  53 #else
  54                 return lua_resume(L, nargs);
  55 #endif
  56         }
  57
  58 }}