mirror of
https://github.com/ThePhD/sol2.git
synced 2024-03-22 13:10:44 +08:00
356 lines
13 KiB
C++
356 lines
13 KiB
C++
// The MIT License (MIT)
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// Copyright (c) 2013-2017 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_PROTECTED_FUNCTION_HPP
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#define SOL_PROTECTED_FUNCTION_HPP
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#include "reference.hpp"
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#include "stack.hpp"
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#include "protected_function_result.hpp"
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#include "unsafe_function.hpp"
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#include <cstdint>
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#include <algorithm>
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namespace sol {
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namespace detail {
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inline const char (&default_handler_name())[9] {
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static const char name[9] = "sol.\xF0\x9F\x94\xA9";
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return name;
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}
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template <bool b, typename target_t = reference>
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struct protected_handler {
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typedef is_stack_based<target_t> is_stack;
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const target_t& target;
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int stackindex;
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protected_handler(std::false_type, const target_t& target)
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: target(target), stackindex(0) {
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if (b) {
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stackindex = lua_gettop(target.lua_state()) + 1;
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target.push();
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}
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}
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protected_handler(std::true_type, const target_t& target)
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: target(target), stackindex(0) {
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if (b) {
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stackindex = target.stack_index();
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}
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}
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protected_handler(const target_t& target)
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: protected_handler(is_stack(), target) {
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}
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bool valid() const noexcept {
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return b;
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}
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~protected_handler() {
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if (!is_stack::value && stackindex != 0) {
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lua_remove(target.lua_state(), stackindex);
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}
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}
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};
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template <typename base_t, typename T>
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basic_function<base_t> force_cast(T& p) {
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return p;
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}
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} // namespace detail
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template <typename base_t, bool aligned = false, typename handler_t = reference>
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class basic_protected_function : public base_t {
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public:
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typedef is_stack_based<handler_t> is_stack_handler;
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static handler_t get_default_handler(lua_State* L) {
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if (is_stack_handler::value || L == nullptr)
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return handler_t(L, lua_nil);
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L = is_main_threaded<base_t>::value ? main_thread(L, L) : L;
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lua_getglobal(L, detail::default_handler_name());
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auto pp = stack::pop_n(L, 1);
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return handler_t(L, -1);
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}
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template <typename T>
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static void set_default_handler(const T& ref) {
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if (ref.lua_state() == nullptr) {
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return;
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}
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lua_State* L = ref.lua_state();
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if (!ref.valid()) {
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lua_pushnil(L);
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lua_setglobal(L, detail::default_handler_name());
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}
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else {
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ref.push();
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lua_setglobal(L, detail::default_handler_name());
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}
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}
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private:
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template <bool b>
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call_status luacall(std::ptrdiff_t argcount, std::ptrdiff_t resultcount, detail::protected_handler<b, handler_t>& h) const {
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return static_cast<call_status>(lua_pcall(lua_state(), static_cast<int>(argcount), static_cast<int>(resultcount), h.stackindex));
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}
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template <std::size_t... I, bool b, typename... Ret>
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auto invoke(types<Ret...>, std::index_sequence<I...>, std::ptrdiff_t n, detail::protected_handler<b, handler_t>& h) const {
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luacall(n, sizeof...(Ret), h);
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return stack::pop<std::tuple<Ret...>>(lua_state());
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}
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template <std::size_t I, bool b, typename Ret>
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Ret invoke(types<Ret>, std::index_sequence<I>, std::ptrdiff_t n, detail::protected_handler<b, handler_t>& h) const {
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luacall(n, 1, h);
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return stack::pop<Ret>(lua_state());
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}
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template <std::size_t I, bool b>
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void invoke(types<void>, std::index_sequence<I>, std::ptrdiff_t n, detail::protected_handler<b, handler_t>& h) const {
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luacall(n, 0, h);
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}
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template <bool b>
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protected_function_result invoke(types<>, std::index_sequence<>, std::ptrdiff_t n, detail::protected_handler<b, handler_t>& h) const {
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int stacksize = lua_gettop(lua_state());
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int poststacksize = stacksize;
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int firstreturn = 1;
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int returncount = 0;
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call_status code = call_status::ok;
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#ifndef SOL_NO_EXCEPTIONS
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auto onexcept = [&](const char* error) {
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h.stackindex = 0;
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if (b) {
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h.target.push();
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stack::push(lua_state(), error);
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lua_call(lua_state(), 1, 1);
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}
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else {
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stack::push(lua_state(), error);
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}
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};
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try {
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#endif // No Exceptions
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firstreturn = (std::max)(1, static_cast<int>(stacksize - n - static_cast<int>(h.valid())));
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code = luacall(n, LUA_MULTRET, h);
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poststacksize = lua_gettop(lua_state()) - static_cast<int>(h.valid());
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returncount = poststacksize - (firstreturn - 1);
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#ifndef SOL_NO_EXCEPTIONS
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}
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#if !defined(SOL_EXCEPTIONS_SAFE_PROPAGATION)
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// Handle C++ errors thrown from C++ functions bound inside of lua
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catch (const char* error) {
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onexcept(error);
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firstreturn = lua_gettop(lua_state());
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return protected_function_result(lua_state(), firstreturn, 0, 1, call_status::runtime);
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}
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catch (const std::exception& error) {
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onexcept(error.what());
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firstreturn = lua_gettop(lua_state());
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return protected_function_result(lua_state(), firstreturn, 0, 1, call_status::runtime);
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}
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catch (...) {
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onexcept("caught (...) unknown error during protected_function call");
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firstreturn = lua_gettop(lua_state());
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return protected_function_result(lua_state(), firstreturn, 0, 1, call_status::runtime);
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}
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#else
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// do not handle exceptions: they can be propogated into C++ and keep all type information / rich information
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#endif // about as safe as possible
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#endif // No Exceptions
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return protected_function_result(lua_state(), firstreturn, returncount, returncount, code);
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}
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public:
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using base_t::lua_state;
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handler_t error_handler;
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basic_protected_function() = default;
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template <typename T, meta::enable<meta::neg<std::is_same<meta::unqualified_t<T>, basic_protected_function>>, meta::neg<std::is_base_of<proxy_base_tag, meta::unqualified_t<T>>>, meta::neg<std::is_same<base_t, stack_reference>>, is_lua_reference<meta::unqualified_t<T>>> = meta::enabler>
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basic_protected_function(T&& r) noexcept
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: base_t(std::forward<T>(r)), error_handler(get_default_handler(r.lua_state())) {
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#ifdef SOL_CHECK_ARGUMENTS
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if (!is_function<meta::unqualified_t<T>>::value) {
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auto pp = stack::push_pop(*this);
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constructor_handler handler{};
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stack::check<basic_protected_function>(lua_state(), -1, handler);
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}
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#endif // Safety
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}
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basic_protected_function(const basic_protected_function&) = default;
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basic_protected_function& operator=(const basic_protected_function&) = default;
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basic_protected_function(basic_protected_function&&) = default;
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basic_protected_function& operator=(basic_protected_function&&) = default;
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basic_protected_function(const basic_function<base_t>& b)
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: basic_protected_function(b, get_default_handler(b.lua_state())) {
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}
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basic_protected_function(basic_function<base_t>&& b)
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: basic_protected_function(std::move(b), get_default_handler(b.lua_state())) {
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}
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basic_protected_function(const basic_function<base_t>& b, handler_t eh)
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: base_t(b), error_handler(std::move(eh)) {
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}
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basic_protected_function(basic_function<base_t>&& b, handler_t eh)
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: base_t(std::move(b)), error_handler(std::move(eh)) {
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}
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basic_protected_function(const stack_reference& r)
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: basic_protected_function(r.lua_state(), r.stack_index(), get_default_handler(r.lua_state())) {
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}
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basic_protected_function(stack_reference&& r)
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: basic_protected_function(r.lua_state(), r.stack_index(), get_default_handler(r.lua_state())) {
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}
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basic_protected_function(const stack_reference& r, handler_t eh)
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: basic_protected_function(r.lua_state(), r.stack_index(), std::move(eh)) {
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}
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basic_protected_function(stack_reference&& r, handler_t eh)
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: basic_protected_function(r.lua_state(), r.stack_index(), std::move(eh)) {
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}
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template <typename Super>
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basic_protected_function(const proxy_base<Super>& p)
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: basic_protected_function(p, get_default_handler(p.lua_state())) {
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}
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template <typename Super>
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basic_protected_function(proxy_base<Super>&& p)
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: basic_protected_function(std::move(p), get_default_handler(p.lua_state())) {
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}
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template <typename Proxy, typename Handler, meta::enable<std::is_base_of<proxy_base_tag, meta::unqualified_t<Proxy>>, meta::neg<is_lua_index<meta::unqualified_t<Handler>>>> = meta::enabler>
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basic_protected_function(Proxy&& p, Handler&& eh)
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: basic_protected_function(detail::force_cast<base_t>(p), std::forward<Handler>(eh)) {
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}
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template <typename T, meta::enable<is_lua_reference<meta::unqualified_t<T>>> = meta::enabler>
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basic_protected_function(lua_State* L, T&& r)
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: basic_protected_function(L, std::forward<T>(r), get_default_handler(L)) {
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}
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template <typename T, meta::enable<is_lua_reference<meta::unqualified_t<T>>> = meta::enabler>
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basic_protected_function(lua_State* L, T&& r, handler_t eh)
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: base_t(L, std::forward<T>(r)), error_handler(std::move(eh)) {
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#ifdef SOL_CHECK_ARGUMENTS
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auto pp = stack::push_pop(*this);
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constructor_handler handler{};
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stack::check<basic_protected_function>(lua_state(), -1, handler);
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#endif // Safety
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}
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basic_protected_function(lua_State* L, int index = -1)
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: basic_protected_function(L, index, get_default_handler(L)) {
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}
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basic_protected_function(lua_State* L, int index, handler_t eh)
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: base_t(L, index), error_handler(std::move(eh)) {
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#ifdef SOL_CHECK_ARGUMENTS
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constructor_handler handler{};
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stack::check<basic_protected_function>(L, index, handler);
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#endif // Safety
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}
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basic_protected_function(lua_State* L, absolute_index index)
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: basic_protected_function(L, index, get_default_handler(L)) {
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}
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basic_protected_function(lua_State* L, absolute_index index, handler_t eh)
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: base_t(L, index), error_handler(std::move(eh)) {
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#ifdef SOL_CHECK_ARGUMENTS
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constructor_handler handler{};
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stack::check<basic_protected_function>(L, index, handler);
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#endif // Safety
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}
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basic_protected_function(lua_State* L, raw_index index)
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: basic_protected_function(L, index, get_default_handler(L)) {
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}
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basic_protected_function(lua_State* L, raw_index index, handler_t eh)
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: base_t(L, index), error_handler(std::move(eh)) {
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#ifdef SOL_CHECK_ARGUMENTS
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constructor_handler handler{};
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stack::check<basic_protected_function>(L, index, handler);
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#endif // Safety
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}
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basic_protected_function(lua_State* L, ref_index index)
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: basic_protected_function(L, index, get_default_handler(L)) {
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}
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basic_protected_function(lua_State* L, ref_index index, handler_t eh)
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: base_t(L, index), error_handler(std::move(eh)) {
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#ifdef SOL_CHECK_ARGUMENTS
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auto pp = stack::push_pop(*this);
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constructor_handler handler{};
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stack::check<basic_protected_function>(lua_state(), -1, handler);
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#endif // Safety
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}
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template <typename... Args>
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protected_function_result operator()(Args&&... args) const {
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return call<>(std::forward<Args>(args)...);
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}
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template <typename... Ret, typename... Args>
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decltype(auto) operator()(types<Ret...>, Args&&... args) const {
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return call<Ret...>(std::forward<Args>(args)...);
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}
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template <typename... Ret, typename... Args>
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decltype(auto) call(Args&&... args) const {
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if (!aligned) {
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// we do not expect the function to already be on the stack: push it
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if (error_handler.valid()) {
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detail::protected_handler<true, handler_t> h(error_handler);
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base_t::push();
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int pushcount = stack::multi_push_reference(lua_state(), std::forward<Args>(args)...);
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return invoke(types<Ret...>(), std::make_index_sequence<sizeof...(Ret)>(), pushcount, h);
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}
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else {
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detail::protected_handler<false, handler_t> h(error_handler);
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base_t::push();
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int pushcount = stack::multi_push_reference(lua_state(), std::forward<Args>(args)...);
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return invoke(types<Ret...>(), std::make_index_sequence<sizeof...(Ret)>(), pushcount, h);
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}
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}
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else {
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// the function is already on the stack at the right location
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if (error_handler.valid()) {
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// the handler will be pushed onto the stack manually,
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// since it's not already on the stack this means we need to push our own
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// function on the stack too and swap things to be in-place
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if (!is_stack_handler::value) {
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// so, we need to remove the function at the top and then dump the handler out ourselves
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base_t::push();
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}
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detail::protected_handler<true, handler_t> h(error_handler);
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if (!is_stack_handler::value) {
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lua_replace(lua_state(), -3);
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h.stackindex = lua_absindex(lua_state(), -2);
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}
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int pushcount = stack::multi_push_reference(lua_state(), std::forward<Args>(args)...);
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return invoke(types<Ret...>(), std::make_index_sequence<sizeof...(Ret)>(), pushcount, h);
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}
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else {
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detail::protected_handler<false, handler_t> h(error_handler);
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int pushcount = stack::multi_push_reference(lua_state(), std::forward<Args>(args)...);
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return invoke(types<Ret...>(), std::make_index_sequence<sizeof...(Ret)>(), pushcount, h);
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}
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}
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}
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};
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} // namespace sol
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#endif // SOL_FUNCTION_HPP
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