233 lines
8.2 KiB
C++
233 lines
8.2 KiB
C++
#pragma once
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/*
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* Copyright (C) 2024 Brett Terpstra
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#ifndef BLT_GP_OPERATIONS_H
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#define BLT_GP_OPERATIONS_H
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#include <blt/std/types.h>
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#include <blt/gp/typesystem.h>
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#include <blt/gp/stack.h>
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#include <blt/gp/util/meta.h>
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#include <functional>
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#include <type_traits>
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#include <optional>
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namespace blt::gp
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{
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template <typename Return, typename... Args>
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struct call_with
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{
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template <u64 index>
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[[nodiscard]] constexpr static size_t getByteOffset()
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{
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size_t offset = 0;
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size_t current_index = 0;
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((offset += (current_index++ > index ? stack_allocator::aligned_size<detail::remove_cv_ref<Args>>() : 0)), ...);
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(void)current_index;
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return offset;
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}
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template <u64... indices>
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void print_args(std::integer_sequence<u64, indices...>)
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{
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BLT_INFO("Arguments:");
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(BLT_INFO("%ld: %s", indices, blt::type_string<Args>().c_str()), ...);
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}
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template <typename Func, u64... indices, typename... ExtraArgs>
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static constexpr Return exec_sequence_to_indices(Func&& func, stack_allocator& allocator, std::integer_sequence<u64, indices...>,
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ExtraArgs&&... args)
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{
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//blt::size_t arg_size = (stack_allocator::aligned_size<detail::remove_cv_ref<Args>>() + ...);
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//BLT_TRACE(arg_size);
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// expands Args and indices, providing each argument with its index calculating the current argument byte offset
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return std::forward<Func>(func)(std::forward<ExtraArgs>(args)...,
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allocator.from<detail::remove_cv_ref<Args>>(getByteOffset<indices>())...);
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}
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template<typename T>
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static void call_drop(stack_allocator& read_allocator, const size_t offset)
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{
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if constexpr (blt::gp::detail::has_func_drop_v<T>)
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{
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read_allocator.from<detail::remove_cv_ref<T>>(offset).drop();
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}
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}
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static void call_destructors(stack_allocator& read_allocator)
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{
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if constexpr (sizeof...(Args) > 0)
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{
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size_t offset = (stack_allocator::aligned_size<detail::remove_cv_ref<Args>>() + ...) - stack_allocator::aligned_size<
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detail::remove_cv_ref<typename meta::arg_helper<Args...>::First>>();
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((call_drop<Args>(read_allocator, offset), offset -= stack_allocator::aligned_size<detail::remove_cv_ref<Args>>()), ...);
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(void)offset;
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}
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}
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template <typename Func, typename... ExtraArgs>
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Return operator()(const bool, Func&& func, stack_allocator& read_allocator, ExtraArgs&&... args)
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{
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constexpr auto seq = std::make_integer_sequence<u64, sizeof...(Args)>();
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#if BLT_DEBUG_LEVEL > 0
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try
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{
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#endif
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Return ret = exec_sequence_to_indices(std::forward<Func>(func), read_allocator, seq, std::forward<ExtraArgs>(args)...);
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call_destructors(read_allocator);
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read_allocator.pop_bytes((stack_allocator::aligned_size<detail::remove_cv_ref<Args>>() + ...));
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return ret;
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#if BLT_DEBUG_LEVEL > 0
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} catch (const std::runtime_error& e)
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{
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print_args(seq);
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throw std::runtime_error(e.what());
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}
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#endif
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}
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};
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template <typename Return, typename, typename... Args>
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struct call_without_first : public call_with<Return, Args...>
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{
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using call_with<Return, Args...>::call_with;
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};
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template <typename, typename>
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class operation_t;
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template <typename RawFunction, typename Return, typename... Args>
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class operation_t<RawFunction, Return(Args...)>
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{
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public:
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using function_t = RawFunction;
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using First_Arg = typename blt::meta::arg_helper<Args...>::First;
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constexpr operation_t(const operation_t& copy) = default;
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constexpr operation_t(operation_t&& move) = default;
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template <typename Functor>
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constexpr explicit operation_t(const Functor& functor, const std::optional<std::string_view> name = {}): func(functor), name(name)
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{
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}
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[[nodiscard]] constexpr Return operator()(stack_allocator& read_allocator) const
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{
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if constexpr (sizeof...(Args) == 0)
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{
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return func();
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}
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else
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{
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return call_with<Return, Args...>()(false, func, read_allocator);
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}
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}
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[[nodiscard]] constexpr Return operator()(void* context, stack_allocator& read_allocator) const
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{
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// should be an impossible state
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if constexpr (sizeof...(Args) == 0)
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{
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BLT_ABORT("Cannot pass context to function without arguments!");
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}
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auto& ctx_ref = *static_cast<detail::remove_cv_ref<typename detail::first_arg<Args...>::type>*>(context);
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if constexpr (sizeof...(Args) == 1)
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{
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return func(ctx_ref);
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}
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else
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{
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return call_without_first<Return, Args...>()(true, func, read_allocator, ctx_ref);
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}
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}
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template <typename Context>
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[[nodiscard]] detail::operator_func_t make_callable() const
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{
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return [this](void* context, stack_allocator& read_allocator, stack_allocator& write_allocator)
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{
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if constexpr (detail::is_same_v<Context, detail::remove_cv_ref<typename detail::first_arg<Args...>::type>>)
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{
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// first arg is context
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write_allocator.push(this->operator()(context, read_allocator));
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}
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else
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{
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// first arg isn't context
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write_allocator.push(this->operator()(read_allocator));
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}
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};
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}
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[[nodiscard]] inline constexpr std::optional<std::string_view> get_name() const
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{
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return name;
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}
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inline constexpr const auto& get_function() const
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{
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return func;
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}
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auto set_ephemeral()
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{
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is_ephemeral_ = true;
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return *this;
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}
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[[nodiscard]] bool is_ephemeral() const
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{
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return is_ephemeral_;
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}
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[[nodiscard]] bool return_has_ephemeral_drop() const
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{
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return detail::has_func_drop_v<Return>;
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}
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operator_id id = -1;
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private:
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function_t func;
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std::optional<std::string_view> name;
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bool is_ephemeral_ = false;
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};
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template <typename RawFunction, typename Return, typename Class, typename... Args>
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class operation_t<RawFunction, Return (Class::*)(Args...) const> : public operation_t<RawFunction, Return(Args...)>
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{
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public:
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using operation_t<RawFunction, Return(Args...)>::operation_t;
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};
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template <typename Lambda>
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operation_t(Lambda) -> operation_t<Lambda, decltype(&Lambda::operator())>;
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template <typename Return, typename... Args>
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operation_t(Return (*)(Args...)) -> operation_t<Return(*)(Args...), Return(Args...)>;
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template <typename Lambda>
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operation_t(Lambda, std::optional<std::string_view>) -> operation_t<Lambda, decltype(&Lambda::operator())>;
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template <typename Return, typename... Args>
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operation_t(Return (*)(Args...), std::optional<std::string_view>) -> operation_t<Return(*)(Args...), Return(Args...)>;
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}
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#endif //BLT_GP_OPERATIONS_H
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