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352 lines
14 KiB
C++
352 lines
14 KiB
C++
// sol2
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// The MIT License (MIT)
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// Copyright (c) 2013-2021 Rapptz, ThePhD and contributors
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// Permission is hereby granted, free of charge, to any person obtaining a copy of
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// this software and associated documentation files (the "Software"), to deal in
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// the Software without restriction, including without limitation the rights to
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// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
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// the Software, and to permit persons to whom the Software is furnished to do so,
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// subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
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// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
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// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
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// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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#ifndef SOL_STACK_HPP
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#define SOL_STACK_HPP
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#include <sol/trampoline.hpp>
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#include <sol/stack_core.hpp>
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#include <sol/stack_reference.hpp>
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#include <sol/stack_check.hpp>
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#include <sol/stack_get.hpp>
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#include <sol/stack_check_get.hpp>
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#include <sol/stack_push.hpp>
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#include <sol/stack_pop.hpp>
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#include <sol/stack_field.hpp>
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#include <sol/stack_probe.hpp>
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#include <cstring>
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#include <array>
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namespace sol {
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namespace detail {
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using typical_chunk_name_t = char[SOL_ID_SIZE_I_];
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using typical_file_chunk_name_t = char[SOL_FILE_ID_SIZE_I_];
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inline const std::string& default_chunk_name() {
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static const std::string name = "";
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return name;
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}
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template <std::size_t N>
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const char* make_chunk_name(const string_view& code, const std::string& chunkname, char (&basechunkname)[N]) {
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if (chunkname.empty()) {
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auto it = code.cbegin();
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auto e = code.cend();
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std::size_t i = 0;
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static const std::size_t n = N - 4;
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for (i = 0; i < n && it != e; ++i, ++it) {
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basechunkname[i] = *it;
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}
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if (it != e) {
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for (std::size_t c = 0; c < 3; ++i, ++c) {
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basechunkname[i] = '.';
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}
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}
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basechunkname[i] = '\0';
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return &basechunkname[0];
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}
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else {
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return chunkname.c_str();
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}
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}
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inline void clear_entries(stack_reference r) {
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stack::push(r.lua_state(), lua_nil);
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while (lua_next(r.lua_state(), -2)) {
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absolute_index key(r.lua_state(), -2);
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auto pn = stack::pop_n(r.lua_state(), 1);
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stack::set_field<false, true>(r.lua_state(), key, lua_nil, r.stack_index());
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}
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}
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inline void clear_entries(const reference& registry_reference) {
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auto pp = stack::push_pop(registry_reference);
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stack_reference ref(registry_reference.lua_state(), -1);
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clear_entries(ref);
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}
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} // namespace detail
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namespace stack {
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namespace stack_detail {
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template <typename T>
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inline int push_as_upvalues(lua_State* L, T& item) {
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typedef std::decay_t<T> TValue;
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static const std::size_t itemsize = sizeof(TValue);
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static const std::size_t voidsize = sizeof(void*);
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static const std::size_t voidsizem1 = voidsize - 1;
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static const std::size_t data_t_count = (sizeof(TValue) + voidsizem1) / voidsize;
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typedef std::array<void*, data_t_count> data_t;
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data_t data { {} };
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std::memcpy(&data[0], std::addressof(item), itemsize);
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int pushcount = 0;
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for (const auto& v : data) {
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lua_pushlightuserdata(L, v);
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pushcount += 1;
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}
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return pushcount;
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}
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template <typename T>
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inline std::pair<T, int> get_as_upvalues(lua_State* L, int index = 2) {
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static const std::size_t data_t_count = (sizeof(T) + (sizeof(void*) - 1)) / sizeof(void*);
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typedef std::array<void*, data_t_count> data_t;
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data_t voiddata { {} };
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for (std::size_t i = 0, d = 0; d < sizeof(T); ++i, d += sizeof(void*)) {
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voiddata[i] = lua_touserdata(L, upvalue_index(index++));
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}
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return std::pair<T, int>(*reinterpret_cast<T*>(static_cast<void*>(voiddata.data())), index);
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}
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template <typename T>
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inline std::pair<T, int> get_as_upvalues_using_function(lua_State* L, int function_index = -1) {
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static const std::size_t data_t_count = (sizeof(T) + (sizeof(void*) - 1)) / sizeof(void*);
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typedef std::array<void*, data_t_count> data_t;
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function_index = lua_absindex(L, function_index);
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int index = 0;
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data_t voiddata { {} };
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for (std::size_t d = 0; d < sizeof(T); d += sizeof(void*)) {
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// first upvalue is nullptr to respect environment shenanigans
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// So +2 instead of +1
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const char* upvalue_name = lua_getupvalue(L, function_index, index + 2);
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if (upvalue_name == nullptr) {
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// We should freak out here...
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break;
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}
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voiddata[index] = lua_touserdata(L, -1);
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++index;
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}
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lua_pop(L, index);
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return std::pair<T, int>(*reinterpret_cast<T*>(static_cast<void*>(voiddata.data())), index);
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}
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template <bool checked, typename Handler, typename Fx, typename... Args>
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static decltype(auto) eval(types<>, std::index_sequence<>, lua_State*, int, Handler&&, record&, Fx&& fx, Args&&... args) {
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return std::forward<Fx>(fx)(std::forward<Args>(args)...);
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}
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template <bool checked, typename Arg, typename... Args, std::size_t I, std::size_t... Is, typename Handler, typename Fx, typename... FxArgs>
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static decltype(auto) eval(types<Arg, Args...>, std::index_sequence<I, Is...>, lua_State* L_, int start_index_, Handler&& handler_,
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record& tracking_, Fx&& fx_, FxArgs&&... fxargs_) {
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#if SOL_IS_ON(SOL_PROPAGATE_EXCEPTIONS_I_)
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// We can save performance/time by letting errors unwind produced arguments
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// rather than checking everything once, and then potentially re-doing work
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if constexpr (checked) {
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return eval<checked>(types<Args...>(),
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std::index_sequence<Is...>(),
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L_,
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start_index_,
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std::forward<Handler>(handler_),
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tracking_,
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std::forward<Fx>(fx_),
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std::forward<FxArgs>(fxargs_)...,
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*stack_detail::check_get_arg<Arg>(L_, start_index_ + tracking_.used, handler_, tracking_));
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}
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else
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#endif
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{
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return eval<checked>(types<Args...>(),
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std::index_sequence<Is...>(),
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L_,
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start_index_,
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std::forward<Handler>(handler_),
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tracking_,
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std::forward<Fx>(fx_),
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std::forward<FxArgs>(fxargs_)...,
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stack_detail::unchecked_get_arg<Arg>(L_, start_index_ + tracking_.used, tracking_));
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}
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}
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template <bool checkargs = detail::default_safe_function_calls, std::size_t... I, typename R, typename... Args, typename Fx, typename... FxArgs>
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inline decltype(auto) call(types<R>, types<Args...> argument_types_, std::index_sequence<I...> argument_indices_, lua_State* L_,
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int start_index_, Fx&& fx_, FxArgs&&... args_) {
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static_assert(meta::all_v<meta::is_not_move_only<Args>...>,
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"One of the arguments being bound is a move-only type, and it is not being taken by reference: this will break your code. Please take "
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"a reference and std::move it manually if this was your intention.");
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argument_handler<types<R, Args...>> handler {};
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record tracking {};
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#if SOL_IS_OFF(SOL_PROPAGATE_EXCEPTIONS_I_)
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if constexpr (checkargs) {
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multi_check<Args...>(L_, start_index_, handler);
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}
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#endif
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if constexpr (std::is_void_v<R>) {
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eval<checkargs>(
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argument_types_, argument_indices_, L_, start_index_, handler, tracking, std::forward<Fx>(fx_), std::forward<FxArgs>(args_)...);
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}
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else {
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return eval<checkargs>(
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argument_types_, argument_indices_, L_, start_index_, handler, tracking, std::forward<Fx>(fx_), std::forward<FxArgs>(args_)...);
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}
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}
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} // namespace stack_detail
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template <typename T>
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int set_ref(lua_State* L, T&& arg, int tableindex = -2) {
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push(L, std::forward<T>(arg));
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return luaL_ref(L, tableindex);
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}
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template <bool check_args = detail::default_safe_function_calls, typename R, typename... Args, typename Fx, typename... FxArgs>
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inline decltype(auto) call(types<R> tr, types<Args...> ta, lua_State* L, int start, Fx&& fx, FxArgs&&... args) {
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using args_indices = std::make_index_sequence<sizeof...(Args)>;
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if constexpr (std::is_void_v<R>) {
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stack_detail::call<check_args>(tr, ta, args_indices(), L, start, std::forward<Fx>(fx), std::forward<FxArgs>(args)...);
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}
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else {
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return stack_detail::call<check_args>(tr, ta, args_indices(), L, start, std::forward<Fx>(fx), std::forward<FxArgs>(args)...);
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}
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}
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template <bool check_args = detail::default_safe_function_calls, typename R, typename... Args, typename Fx, typename... FxArgs>
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inline decltype(auto) call(types<R> tr, types<Args...> ta, lua_State* L, Fx&& fx, FxArgs&&... args) {
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if constexpr (std::is_void_v<R>) {
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call<check_args>(tr, ta, L, 1, std::forward<Fx>(fx), std::forward<FxArgs>(args)...);
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}
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else {
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return call<check_args>(tr, ta, L, 1, std::forward<Fx>(fx), std::forward<FxArgs>(args)...);
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}
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}
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template <bool check_args = detail::default_safe_function_calls, typename R, typename... Args, typename Fx, typename... FxArgs>
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inline decltype(auto) call_from_top(types<R> tr, types<Args...> ta, lua_State* L, Fx&& fx, FxArgs&&... args) {
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using expected_count_t = meta::count_for_pack<lua_size, Args...>;
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if constexpr (std::is_void_v<R>) {
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call<check_args>(tr,
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ta,
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L,
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(std::max)(static_cast<int>(lua_gettop(L) - expected_count_t::value), static_cast<int>(0)),
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std::forward<Fx>(fx),
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std::forward<FxArgs>(args)...);
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}
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else {
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return call<check_args>(tr,
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ta,
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L,
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(std::max)(static_cast<int>(lua_gettop(L) - expected_count_t::value), static_cast<int>(0)),
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std::forward<Fx>(fx),
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std::forward<FxArgs>(args)...);
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}
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}
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template <bool check_args = detail::default_safe_function_calls, bool clean_stack = true, typename Ret0, typename... Ret, typename... Args,
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typename Fx, typename... FxArgs>
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inline int call_into_lua(types<Ret0, Ret...> tr, types<Args...> ta, lua_State* L, int start, Fx&& fx, FxArgs&&... fxargs) {
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if constexpr (std::is_void_v<Ret0>) {
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call<check_args>(tr, ta, L, start, std::forward<Fx>(fx), std::forward<FxArgs>(fxargs)...);
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if constexpr (clean_stack) {
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lua_settop(L, 0);
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}
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return 0;
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}
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else {
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(void)tr;
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decltype(auto) r
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= call<check_args>(types<meta::return_type_t<Ret0, Ret...>>(), ta, L, start, std::forward<Fx>(fx), std::forward<FxArgs>(fxargs)...);
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using R = meta::unqualified_t<decltype(r)>;
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using is_stack = meta::any<is_stack_based<R>, std::is_same<R, absolute_index>, std::is_same<R, ref_index>, std::is_same<R, raw_index>>;
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if constexpr (clean_stack && !is_stack::value) {
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lua_settop(L, 0);
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}
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return push_reference(L, std::forward<decltype(r)>(r));
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}
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}
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template <bool check_args = detail::default_safe_function_calls, bool clean_stack = true, typename Fx, typename... FxArgs>
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inline int call_lua(lua_State* L, int start, Fx&& fx, FxArgs&&... fxargs) {
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using traits_type = lua_bind_traits<meta::unqualified_t<Fx>>;
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using args_list = typename traits_type::args_list;
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using returns_list = typename traits_type::returns_list;
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return call_into_lua<check_args, clean_stack>(returns_list(), args_list(), L, start, std::forward<Fx>(fx), std::forward<FxArgs>(fxargs)...);
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}
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inline call_syntax get_call_syntax(lua_State* L, const string_view& key, int index) {
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if (lua_gettop(L) < 1) {
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return call_syntax::dot;
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}
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luaL_getmetatable(L, key.data());
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auto pn = pop_n(L, 1);
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if (lua_compare(L, -1, index, LUA_OPEQ) != 1) {
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return call_syntax::dot;
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}
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return call_syntax::colon;
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}
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inline void script(
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lua_State* L, lua_Reader reader, void* data, const std::string& chunkname = detail::default_chunk_name(), load_mode mode = load_mode::any) {
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detail::typical_chunk_name_t basechunkname = {};
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const char* chunknametarget = detail::make_chunk_name("lua_Reader", chunkname, basechunkname);
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if (lua_load(L, reader, data, chunknametarget, to_string(mode).c_str()) || lua_pcall(L, 0, LUA_MULTRET, 0)) {
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lua_error(L);
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}
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}
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inline void script(
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lua_State* L, const string_view& code, const std::string& chunkname = detail::default_chunk_name(), load_mode mode = load_mode::any) {
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detail::typical_chunk_name_t basechunkname = {};
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const char* chunknametarget = detail::make_chunk_name(code, chunkname, basechunkname);
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if (luaL_loadbufferx(L, code.data(), code.size(), chunknametarget, to_string(mode).c_str()) || lua_pcall(L, 0, LUA_MULTRET, 0)) {
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lua_error(L);
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}
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}
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inline void script_file(lua_State* L, const std::string& filename, load_mode mode = load_mode::any) {
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if (luaL_loadfilex(L, filename.c_str(), to_string(mode).c_str()) || lua_pcall(L, 0, LUA_MULTRET, 0)) {
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lua_error(L);
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}
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}
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inline void luajit_exception_handler(lua_State* L, int (*handler)(lua_State*, lua_CFunction) = detail::c_trampoline) {
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#if SOL_IS_ON(SOL_USE_LUAJIT_EXCEPTION_TRAMPOLINE_I_)
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if (L == nullptr) {
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return;
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}
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#if SOL_IS_ON(SOL_SAFE_STACK_CHECK_I_)
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luaL_checkstack(L, 1, detail::not_enough_stack_space_generic);
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#endif // make sure stack doesn't overflow
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lua_pushlightuserdata(L, (void*)handler);
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auto pn = pop_n(L, 1);
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luaJIT_setmode(L, -1, LUAJIT_MODE_WRAPCFUNC | LUAJIT_MODE_ON);
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#else
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(void)L;
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(void)handler;
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#endif
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}
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inline void luajit_exception_off(lua_State* L) {
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#if SOL_IS_ON(SOL_USE_LUAJIT_EXCEPTION_TRAMPOLINE_I_)
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if (L == nullptr) {
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return;
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}
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luaJIT_setmode(L, -1, LUAJIT_MODE_WRAPCFUNC | LUAJIT_MODE_OFF);
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#else
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(void)L;
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#endif
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}
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} // namespace stack
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} // namespace sol
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#endif // SOL_STACK_HPP
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