1 files changed, 216 insertions, 0 deletions
diff --git a/deps/sol2/include/sol/trampoline.hpp b/deps/sol2/include/sol/trampoline.hpp
new file mode 100644
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+++ b/deps/sol2/include/sol/trampoline.hpp
@@ -0,0 +1,216 @@
+// sol3 
+
+// The MIT License (MIT)
+
+// Copyright (c) 2013-2019 Rapptz, ThePhD and contributors
+
+// Permission is hereby granted, free of charge, to any person obtaining a copy of
+// this software and associated documentation files (the "Software"), to deal in
+// the Software without restriction, including without limitation the rights to
+// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+// the Software, and to permit persons to whom the Software is furnished to do so,
+// subject to the following conditions:
+
+// The above copyright notice and this permission notice shall be included in all
+// copies or substantial portions of the Software.
+
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+
+#ifndef SOL_TRAMPOLINE_HPP
+#define SOL_TRAMPOLINE_HPP
+
+#include "types.hpp"
+#include "traits.hpp"
+#include <exception>
+#include <cstring>
+
+#if defined(SOL_PRINT_ERRORS) && SOL_PRINT_ERRORS
+#include <iostream>
+#endif
+
+namespace sol {
+	// must push a single object to be the error object
+	// NOTE: the VAST MAJORITY of all Lua libraries -- C or otherwise -- expect a string for the type of error
+	// break this convention at your own risk
+	using exception_handler_function = int(*)(lua_State*, optional<const std::exception&>, string_view);
+
+	namespace detail {
+		inline const char(&default_exception_handler_name())[11]{
+			static const char name[11] = "sol.\xE2\x98\xA2\xE2\x98\xA2";
+			return name;
+		}
+
+		// must push at least 1 object on the stack
+		inline int default_exception_handler(lua_State* L, optional<const std::exception&>, string_view what) {
+#if defined(SOL_PRINT_ERRORS) && SOL_PRINT_ERRORS
+			std::cerr << "[sol3] An exception occurred: ";
+			std::cerr.write(what.data(), what.size());
+			std::cerr << std::endl;
+#endif
+			lua_pushlstring(L, what.data(), what.size());
+			return 1;
+		}
+
+		inline int call_exception_handler(lua_State* L, optional<const std::exception&> maybe_ex, string_view what) {
+			lua_getglobal(L, default_exception_handler_name());
+			type t = static_cast<type>(lua_type(L, -1));
+			if (t != type::lightuserdata) {
+				lua_pop(L, 1);
+				return default_exception_handler(L, std::move(maybe_ex), std::move(what));
+			}
+			void* vfunc = lua_touserdata(L, -1);
+			lua_pop(L, 1);
+			if (vfunc == nullptr) {
+				return default_exception_handler(L, std::move(maybe_ex), std::move(what));
+			}
+			exception_handler_function exfunc = reinterpret_cast<exception_handler_function>(vfunc);
+			return exfunc(L, std::move(maybe_ex), std::move(what));
+		}
+
+#ifdef SOL_NO_EXCEPTIONS
+		template <lua_CFunction f>
+		int static_trampoline(lua_State* L) noexcept {
+			return f(L);
+		}
+
+#ifdef SOL_NOEXCEPT_FUNCTION_TYPE
+		template <lua_CFunction_noexcept f>
+		int static_trampoline_noexcept(lua_State* L) noexcept {
+			return f(L);
+		}
+#else
+		template <lua_CFunction f>
+		int static_trampoline_noexcept(lua_State* L) noexcept {
+			return f(L);
+		}
+#endif
+
+		template <typename Fx, typename... Args>
+		int trampoline(lua_State* L, Fx&& f, Args&&... args) noexcept {
+			return f(L, std::forward<Args>(args)...);
+		}
+
+		inline int c_trampoline(lua_State* L, lua_CFunction f) noexcept {
+			return trampoline(L, f);
+		}
+#else
+		template <lua_CFunction f>
+		int static_trampoline(lua_State* L) {
+#if defined(SOL_EXCEPTIONS_SAFE_PROPAGATION) && !defined(SOL_LUAJIT)
+			return f(L);
+
+#else
+			try {
+				return f(L);
+			}
+			catch (const char* cs) {
+				call_exception_handler(L, optional<const std::exception&>(nullopt), string_view(cs));
+			}
+			catch (const std::string& s) {
+				call_exception_handler(L, optional<const std::exception&>(nullopt), string_view(s.c_str(), s.size()));
+			}
+			catch (const std::exception& e) {
+				call_exception_handler(L, optional<const std::exception&>(e), e.what());
+			}
+#if !defined(SOL_EXCEPTIONS_SAFE_PROPAGATION)
+			// 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 (...) {
+				call_exception_handler(L, optional<const std::exception&>(nullopt), "caught (...) exception");
+			}
+#endif // LuaJIT cannot have the catchall, but we must catch std::exceps for it
+			return lua_error(L);
+#endif // Safe exceptions
+		}
+
+#ifdef SOL_NOEXCEPT_FUNCTION_TYPE
+#if 0 
+		// impossible: g++/clang++ choke as they think this function is ambiguous:
+		// to fix, wait for template <auto X> and then switch on no-exceptness of the function
+		template <lua_CFunction_noexcept f>
+		int static_trampoline(lua_State* L) noexcept {
+			return f(L);
+		}
+#else
+		template <lua_CFunction_noexcept f>
+		int static_trampoline_noexcept(lua_State* L) noexcept {
+			return f(L);
+		}
+#endif // impossible
+
+#else
+		template <lua_CFunction f>
+		int static_trampoline_noexcept(lua_State* L) noexcept {
+			return f(L);
+		}
+#endif // noexcept lua_CFunction type
+
+		template <typename Fx, typename... Args>
+		int trampoline(lua_State* L, Fx&& f, Args&&... args) {
+			if (meta::bind_traits<meta::unqualified_t<Fx>>::is_noexcept) {
+				return f(L, std::forward<Args>(args)...);
+			}
+#if defined(SOL_EXCEPTIONS_SAFE_PROPAGATION) && !defined(SOL_LUAJIT)
+			return f(L, std::forward<Args>(args)...);
+#else
+			try {
+				return f(L, std::forward<Args>(args)...);
+			}
+			catch (const char* cs) {
+				call_exception_handler(L, optional<const std::exception&>(nullopt), string_view(cs));
+			}
+			catch (const std::string& s) {
+				call_exception_handler(L, optional<const std::exception&>(nullopt), string_view(s.c_str(), s.size()));
+			}
+			catch (const std::exception& e) {
+				call_exception_handler(L, optional<const std::exception&>(e), e.what());
+			}
+#if !defined(SOL_EXCEPTIONS_SAFE_PROPAGATION)
+			// 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 (...) {
+				call_exception_handler(L, optional<const std::exception&>(nullopt), "caught (...) exception");
+			}
+#endif
+			return lua_error(L);
+#endif
+		}
+
+		inline int c_trampoline(lua_State* L, lua_CFunction f) {
+			return trampoline(L, f);
+		}
+#endif // Exceptions vs. No Exceptions
+
+		template <typename F, F fx>
+		inline int typed_static_trampoline_raw(std::true_type, lua_State* L) {
+			return static_trampoline_noexcept<fx>(L);
+		}
+
+		template <typename F, F fx>
+		inline int typed_static_trampoline_raw(std::false_type, lua_State* L) {
+			return static_trampoline<fx>(L);
+		}
+
+		template <typename F, F fx>
+		inline int typed_static_trampoline(lua_State* L) {
+			return typed_static_trampoline_raw<F, fx>(std::integral_constant<bool, meta::bind_traits<F>::is_noexcept>(), L);
+		}
+	} // namespace detail
+
+	inline void set_default_exception_handler(lua_State* L, exception_handler_function exf = &detail::default_exception_handler) {
+		static_assert(sizeof(void*) >= sizeof(exception_handler_function), "void* storage is too small to transport the exception handler: please file a bug on the issue tracker");
+		void* storage;
+		std::memcpy(&storage, &exf, sizeof(exception_handler_function));
+		lua_pushlightuserdata(L, storage);
+		lua_setglobal(L, detail::default_exception_handler_name());
+	}
+} // sol
+
+#endif // SOL_TRAMPOLINE_HPP