386 lines
17 KiB
C++
386 lines
17 KiB
C++
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// sol2
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// The MIT License (MIT)
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// Copyright (c) 2013-2022 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 <sol/reference.hpp>
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#include <sol/object.hpp>
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#include <sol/stack.hpp>
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#include <sol/protected_function_result.hpp>
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#include <sol/unsafe_function.hpp>
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#include <sol/protected_handler.hpp>
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#include <sol/bytecode.hpp>
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#include <sol/dump_handler.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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template <bool ShouldPush_, typename Handler_>
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inline void handle_protected_exception(
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lua_State* L_, optional<const std::exception&> maybe_ex, const char* error, detail::protected_handler<ShouldPush_, Handler_>& handler_) {
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handler_.stack_index = 0;
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if (ShouldPush_) {
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handler_.target.push(L_);
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detail::call_exception_handler(L_, maybe_ex, error);
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lua_call(L_, 1, 1);
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}
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else {
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detail::call_exception_handler(L_, maybe_ex, error);
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}
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}
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} // namespace detail
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template <typename Reference, bool Aligned = false, typename Handler = reference>
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class basic_protected_function : public basic_object<Reference> {
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private:
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using base_t = basic_object<Reference>;
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using handler_t = Handler;
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inline static constexpr bool is_stack_handler_v = is_stack_based_v<handler_t>;
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basic_protected_function(std::true_type, const basic_protected_function& other_) noexcept
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: base_t(other_), m_error_handler(other_.m_error_handler.copy(lua_state())) {
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}
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basic_protected_function(std::false_type, const basic_protected_function& other_) noexcept : base_t(other_), m_error_handler(other_.m_error_handler) {
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}
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public:
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basic_protected_function() = default;
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template <typename T,
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meta::enable<meta::neg<std::is_same<meta::unqualified_t<T>, basic_protected_function>>,
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meta::neg<std::is_base_of<proxy_base_tag, meta::unqualified_t<T>>>, meta::neg<std::is_same<base_t, stack_reference>>,
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meta::neg<std::is_same<lua_nil_t, meta::unqualified_t<T>>>, is_lua_reference<meta::unqualified_t<T>>> = meta::enabler>
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basic_protected_function(T&& r) noexcept : base_t(std::forward<T>(r)), m_error_handler(get_default_handler(r.lua_state())) {
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#if SOL_IS_ON(SOL_SAFE_REFERENCES)
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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& other_) noexcept
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: basic_protected_function(meta::boolean<is_stateless_lua_reference_v<Handler>>(), other_) {
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}
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basic_protected_function& operator=(const basic_protected_function& other_) {
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base_t::operator=(other_);
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if constexpr (is_stateless_lua_reference_v<Handler>) {
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m_error_handler.copy_assign(lua_state(), other_.m_error_handler);
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}
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else {
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m_error_handler = other_.m_error_handler;
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}
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return *this;
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}
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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) : 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) : 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) : base_t(b), m_error_handler(std::move(eh)) {
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}
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basic_protected_function(basic_function<base_t>&& b, handler_t eh) : base_t(std::move(b)), m_error_handler(std::move(eh)) {
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}
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basic_protected_function(const stack_reference& r) : 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) : 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) : 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) : 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) : 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) : basic_protected_function(std::move(p), get_default_handler(p.lua_state())) {
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}
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template <typename Proxy, typename HandlerReference,
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meta::enable<std::is_base_of<proxy_base_tag, meta::unqualified_t<Proxy>>,
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meta::neg<is_lua_index<meta::unqualified_t<HandlerReference>>>> = meta::enabler>
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basic_protected_function(Proxy&& p, HandlerReference&& eh)
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: basic_protected_function(detail::force_cast<base_t>(p), make_reference<handler_t>(p.lua_state(), std::forward<HandlerReference>(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) : 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) : base_t(L_, std::forward<T>(r)), m_error_handler(std::move(eh)) {
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#if SOL_IS_ON(SOL_SAFE_REFERENCES)
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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_nil_t n) : base_t(n), m_error_handler(n) {
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}
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basic_protected_function(lua_State* L_, int index_ = -1) : 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) : base_t(L_, index_), m_error_handler(std::move(eh)) {
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#if SOL_IS_ON(SOL_SAFE_REFERENCES)
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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_) : 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) : base_t(L_, index_), m_error_handler(std::move(eh)) {
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#if SOL_IS_ON(SOL_SAFE_REFERENCES)
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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_) : 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) : base_t(L_, index_), m_error_handler(std::move(eh)) {
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#if SOL_IS_ON(SOL_SAFE_REFERENCES)
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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_) : 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) : base_t(L_, index_), m_error_handler(std::move(eh)) {
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#if SOL_IS_ON(SOL_SAFE_REFERENCES)
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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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using base_t::lua_state;
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template <typename Fx>
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int dump(lua_Writer writer, void* userdata_pointer_, bool strip, Fx&& on_error) const {
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this->push();
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auto ppn = stack::push_popper_n<false>(this->lua_state(), 1);
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int r = lua_dump(this->lua_state(), writer, userdata_pointer_, strip ? 1 : 0);
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if (r != 0) {
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return on_error(this->lua_state(), r, writer, userdata_pointer_, strip);
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}
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return r;
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}
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int dump(lua_Writer writer, void* userdata_pointer_, bool strip = false) const {
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return dump(writer, userdata_pointer_, strip, &dump_pass_on_error);
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}
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template <typename Container = bytecode>
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Container dump() const {
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Container bc;
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(void)dump(static_cast<lua_Writer>(&basic_insert_dump_writer<Container>), static_cast<void*>(&bc), false, &dump_throw_on_error);
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return bc;
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}
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template <typename Container = bytecode, typename Fx>
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Container dump(Fx&& on_error) const {
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Container bc;
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(void)dump(static_cast<lua_Writer>(&basic_insert_dump_writer<Container>), static_cast<void*>(&bc), false, std::forward<Fx>(on_error));
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return bc;
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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 constexpr (!Aligned) {
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// we do not expect the function to already be on the stack: push it
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if (m_error_handler.valid(lua_state())) {
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detail::protected_handler<true, handler_t> h(lua_state(), m_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(lua_state(), m_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 (m_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 constexpr (!is_stack_handler_v) {
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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(lua_state(), m_error_handler);
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if constexpr (!is_stack_handler_v) {
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lua_replace(lua_state(), -3);
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h.stack_index = 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(lua_state(), m_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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~basic_protected_function() {
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if constexpr (is_stateless_lua_reference_v<handler_t>) {
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this->m_error_handler.reset(lua_state());
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}
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}
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static handler_t get_default_handler(lua_State* L_) {
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return detail::get_default_handler<handler_t, is_main_threaded_v<base_t>>(L_);
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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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detail::set_default_handler(ref.lua_state(), ref);
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}
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auto get_error_handler() const noexcept {
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if constexpr (is_stateless_lua_reference_v<handler_t>) {
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if constexpr (is_stack_based_v<handler_t>) {
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return stack_reference(lua_state(), m_error_handler.stack_index());
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}
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else {
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return basic_reference<is_main_threaded_v<base_t>>(lua_state(), ref_index(m_error_handler.registry_index()));
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}
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}
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else {
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return m_error_handler;
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}
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}
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template <typename ErrorHandler_>
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void set_error_handler(ErrorHandler_&& error_handler_) noexcept {
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static_assert(!is_stack_based_v<handler_t> || is_stack_based_v<ErrorHandler_>,
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"A stack-based error handler can only be set from a parameter that is also stack-based.");
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if constexpr (std::is_rvalue_reference_v<ErrorHandler_>) {
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m_error_handler = std::forward<ErrorHandler_>(error_handler_);
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}
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else {
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m_error_handler.copy_assign(lua_state(), std::forward<ErrorHandler_>(error_handler_));
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}
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}
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void abandon () noexcept {
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this->m_error_handler.abandon();
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base_t::abandon();
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}
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private:
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handler_t m_error_handler;
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template <bool b>
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call_status luacall(std::ptrdiff_t argcount, std::ptrdiff_t result_count_, detail::protected_handler<b, handler_t>& h) const {
|
||
|
|
return static_cast<call_status>(lua_pcall(lua_state(), static_cast<int>(argcount), static_cast<int>(result_count_), h.stack_index));
|
||
|
|
}
|
||
|
|
|
||
|
|
template <std::size_t... I, bool b, typename... Ret>
|
||
|
|
auto invoke(types<Ret...>, std::index_sequence<I...>, std::ptrdiff_t n, detail::protected_handler<b, handler_t>& h) const {
|
||
|
|
luacall(n, sizeof...(Ret), h);
|
||
|
|
return stack::pop<std::tuple<Ret...>>(lua_state());
|
||
|
|
}
|
||
|
|
|
||
|
|
template <std::size_t I, bool b, typename Ret>
|
||
|
|
Ret invoke(types<Ret>, std::index_sequence<I>, std::ptrdiff_t n, detail::protected_handler<b, handler_t>& h) const {
|
||
|
|
luacall(n, 1, h);
|
||
|
|
return stack::pop<Ret>(lua_state());
|
||
|
|
}
|
||
|
|
|
||
|
|
template <std::size_t I, bool b>
|
||
|
|
void invoke(types<void>, std::index_sequence<I>, std::ptrdiff_t n, detail::protected_handler<b, handler_t>& h) const {
|
||
|
|
luacall(n, 0, h);
|
||
|
|
}
|
||
|
|
|
||
|
|
template <bool b>
|
||
|
|
protected_function_result invoke(types<>, std::index_sequence<>, std::ptrdiff_t n, detail::protected_handler<b, handler_t>& h) const {
|
||
|
|
int stacksize = lua_gettop(lua_state());
|
||
|
|
int poststacksize = stacksize;
|
||
|
|
int firstreturn = 1;
|
||
|
|
int returncount = 0;
|
||
|
|
call_status code = call_status::ok;
|
||
|
|
#if SOL_IS_ON(SOL_EXCEPTIONS) && SOL_IS_OFF(SOL_PROPAGATE_EXCEPTIONS)
|
||
|
|
try {
|
||
|
|
#endif // No Exceptions
|
||
|
|
firstreturn = (std::max)(1, static_cast<int>(stacksize - n - static_cast<int>(h.valid() && !is_stack_handler_v)));
|
||
|
|
code = luacall(n, LUA_MULTRET, h);
|
||
|
|
poststacksize = lua_gettop(lua_state()) - static_cast<int>(h.valid() && !is_stack_handler_v);
|
||
|
|
returncount = poststacksize - (firstreturn - 1);
|
||
|
|
#if SOL_IS_ON(SOL_EXCEPTIONS) && SOL_IS_OFF(SOL_PROPAGATE_EXCEPTIONS)
|
||
|
|
}
|
||
|
|
// Handle C++ errors thrown from C++ functions bound inside of lua
|
||
|
|
catch (const char* error) {
|
||
|
|
detail::handle_protected_exception(lua_state(), optional<const std::exception&>(nullopt), error, h);
|
||
|
|
firstreturn = lua_gettop(lua_state());
|
||
|
|
return protected_function_result(lua_state(), firstreturn, 0, 1, call_status::runtime);
|
||
|
|
}
|
||
|
|
catch (const std::string& error) {
|
||
|
|
detail::handle_protected_exception(lua_state(), optional<const std::exception&>(nullopt), error.c_str(), h);
|
||
|
|
firstreturn = lua_gettop(lua_state());
|
||
|
|
return protected_function_result(lua_state(), firstreturn, 0, 1, call_status::runtime);
|
||
|
|
}
|
||
|
|
catch (const std::exception& error) {
|
||
|
|
detail::handle_protected_exception(lua_state(), optional<const std::exception&>(error), error.what(), h);
|
||
|
|
firstreturn = lua_gettop(lua_state());
|
||
|
|
return protected_function_result(lua_state(), firstreturn, 0, 1, call_status::runtime);
|
||
|
|
}
|
||
|
|
#if SOL_IS_ON(SOL_EXCEPTIONS_CATCH_ALL)
|
||
|
|
// LuaJIT cannot have the catchall when the safe propagation is on
|
||
|
|
// but LuaJIT will swallow all C++ errors
|
||
|
|
// if we don't at least catch std::exception ones
|
||
|
|
catch (...) {
|
||
|
|
detail::handle_protected_exception(lua_state(), optional<const std::exception&>(nullopt), detail::protected_function_error, h);
|
||
|
|
firstreturn = lua_gettop(lua_state());
|
||
|
|
return protected_function_result(lua_state(), firstreturn, 0, 1, call_status::runtime);
|
||
|
|
}
|
||
|
|
#endif // Always catch edge case
|
||
|
|
#else
|
||
|
|
// do not handle exceptions: they can be propogated into C++ and keep all type information / rich information
|
||
|
|
#endif // Exceptions vs. No Exceptions
|
||
|
|
return protected_function_result(lua_state(), firstreturn, returncount, returncount, code);
|
||
|
|
}
|
||
|
|
};
|
||
|
|
} // namespace sol
|
||
|
|
|
||
|
|
#endif // SOL_FUNCTION_HPP
|