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[OH GOD SO BROKEN WHY] This is tentative, untested "support" for calling inherited functions.

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This commit is contained in:
ThePhD 2016-08-10 06:32:44 -04:00
parent b9983f5553
commit 94a1898b37
2 changed files with 86 additions and 23 deletions
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10
sol/inheritance.hpp
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@ -67,6 +67,16 @@ namespace sol {
return key;
}
inline decltype(auto) base_class_index_propogation_key() {
static const auto& key = u8"\xF0\x9F\x8C\xB2.index";
return key;
}
inline decltype(auto) base_class_new_index_propogation_key() {
static const auto& key = u8"\xF0\x9F\x8C\xB2.new_index";
return key;
}
template <typename T, typename... Bases>
struct inheritance {
static bool type_check_bases(types<>, std::size_t) {

99
sol/usertype_metatable.hpp
View File

@ -138,11 +138,16 @@ namespace sol {
typedef std::tuple<clean_type_t<Tn> ...> Tuple;
template <std::size_t Idx>
struct check_binding : is_variable_binding<meta::unqualified_tuple_element_t<Idx, Tuple>> {};
typedef void (*base_walk)(lua_State*, bool&, int&, string_detail::string_shim&);
Tuple functions;
lua_CFunction indexfunc;
lua_CFunction newindexfunc;
lua_CFunction destructfunc;
lua_CFunction callconstructfunc;
lua_CFunction indexbase;
lua_CFunction newindexbase;
base_walk indexbaseclasspropogation;
base_walk newindexbaseclasspropogation;
void* baseclasscheck;
void* baseclasscast;
bool mustindex;
@ -194,6 +199,8 @@ namespace sol {
static_assert(sizeof(void*) <= sizeof(detail::inheritance_cast_function), "The size of this data pointer is too small to fit the inheritance checking function: file a bug report.");
baseclasscheck = (void*)&detail::inheritance<T, Bases...>::type_check;
baseclasscast = (void*)&detail::inheritance<T, Bases...>::type_cast;
indexbaseclasspropogation = walk_all_bases<true, Bases...>;
newindexbaseclasspropogation = walk_all_bases<false, Bases...>;
}
template <std::size_t Idx, typename N, typename F, typename = std::enable_if_t<!meta::any_same<meta::unqualified_t<N>, base_classes_tag, call_construction>::value>>
@ -226,7 +233,10 @@ namespace sol {
template <typename... Args, typename = std::enable_if_t<sizeof...(Args) == sizeof...(Tn)>>
usertype_metatable(Args&&... args) : functions(std::forward<Args>(args)...),
indexfunc(usertype_detail::indexing_fail<true>), newindexfunc(usertype_detail::indexing_fail<false>),
destructfunc(nullptr), callconstructfunc(nullptr), baseclasscheck(nullptr), baseclasscast(nullptr),
destructfunc(nullptr), callconstructfunc(nullptr),
indexbase(&core_indexing_call<true>), newindexbase(&core_indexing_call<false>),
indexbaseclasspropogation(walk_all_bases<true>), newindexbaseclasspropogation(walk_all_bases<false>),
baseclasscheck(nullptr), baseclasscast(nullptr),
mustindex(contains_variable() || contains_index()), secondarymeta(contains_variable()) {
}
@ -251,32 +261,72 @@ namespace sol {
ret = real_find_call<I0, I1>(idx, L);
}
static int real_index_call(lua_State* L) {
usertype_metatable& f = stack::get<light<usertype_metatable>>(L, upvalue_index(1));
if (stack::get<type>(L, -1) == type::string) {
string_detail::string_shim accessor = stack::get<string_detail::string_shim>(L, -1);
bool found = false;
int ret = 0;
(void)detail::swallow{ 0, (f.find_call<I * 2, I * 2 + 1>(std::true_type(), L, found, ret, accessor), 0)... };
if (found) {
return ret;
}
template <bool b>
void propogating_call(lua_State* L, bool& found, int& ret, string_detail::string_shim& accessor) {
(void)detail::swallow{ 0, (find_call<I * 2, I * 2 + 1>(std::integral_constant<bool, b>(), L, found, ret, accessor), 0)... };
}
template <bool b, typename Base>
static void walk_single_base(lua_State* L, bool& found, int& ret, string_detail::string_shim&) {
if (found)
return;
const char* metakey = &usertype_traits<Base>::metatable[0];
const char* gcmetakey = &usertype_traits<Base>::gc_table[0];
const char* basewalkkey = b ? detail::base_class_index_propogation_key() : detail::base_class_new_index_propogation_key();
luaL_getmetatable(L, metakey);
if (type_of(L, -1) == type::nil) {
lua_pop(L, 1);
return;
}
return f.indexfunc(L);
stack::get_field(L, basewalkkey);
if (type_of(L, -1) == type::nil) {
lua_pop(L, 2);
return;
}
lua_CFunction basewalkfunc = stack::pop<lua_CFunction>(L);
lua_pop(L, 1);
stack::get_field<true>(L, gcmetakey);
int value = basewalkfunc(L);
if (value > -1) {
found = true;
ret = value;
}
}
template <bool b, typename... Bases>
static void walk_all_bases(lua_State* L, bool& found, int& ret, string_detail::string_shim& accessor) {
(void)detail::swallow{ 0, (walk_single_base<b, Bases>(L, found, ret, accessor), 0)... };
}
template <bool b, bool toplevel = false>
static int core_indexing_call(lua_State* L) {
usertype_metatable& f = toplevel ? stack::get<light<usertype_metatable>>(L, upvalue_index(1)) : stack::pop<light<usertype_metatable>>(L);
if (toplevel && stack::get<type>(L, -1) != type::string) {
return b ? f.indexfunc(L) : f.newindexfunc(L);
}
string_detail::string_shim accessor = stack::get<string_detail::string_shim>(L, -1);
int ret = 0;
bool found = false;
f.propogating_call<b>(L, found, ret, accessor);
if (found) {
return ret;
}
// Otherwise, we need to do propagating calls through the bases
f.indexbaseclasspropogation(L, found, ret, accessor);
if (found) {
return ret;
}
return toplevel ? (b ? f.indexfunc(L) : f.newindexfunc(L)) : -1;
}
static int real_index_call(lua_State* L) {
return core_indexing_call<true, true>(L);
}
static int real_new_index_call(lua_State* L) {
usertype_metatable& f = stack::get<light<usertype_metatable>>(L, upvalue_index(1));
if (stack::get<type>(L, -2) == type::string) {
string_detail::string_shim accessor = stack::get<string_detail::string_shim>(L, -2);
bool found = false;
int ret = 0;
(void)detail::swallow{ 0, (f.find_call<I * 2, I * 2 + 1>(std::false_type(), L, found, ret, accessor), 0)... };
if (found) {
return ret;
}
}
return f.newindexfunc(L);
return core_indexing_call<false, true>(L);
}
template <std::size_t Idx, bool is_index = true, bool is_variable = false>
@ -394,6 +444,9 @@ namespace sol {
else {
stack::set_field(L, detail::base_class_cast_key(), nil, t.stack_index());
}
stack::set_field(L, detail::base_class_index_propogation_key(), make_closure(um.indexbase, make_light(um)), t.stack_index());
stack::set_field(L, detail::base_class_new_index_propogation_key(), make_closure(um.newindexbase, make_light(um)), t.stack_index());
if (mustindex) {
// Basic index pushing: specialize