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f8ab79e68a
This prevents the pitfall of UB when checking if they have been assigned something valid by comparing to nullptr.
264 lines
8.2 KiB
C++
264 lines
8.2 KiB
C++
/*************************************************************************/
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/* gd_mono_wasm_m2n.h */
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/*************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/*************************************************************************/
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur. */
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/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md). */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/*************************************************************************/
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#ifndef GD_MONO_WASM_M2N_H
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#define GD_MONO_WASM_M2N_H
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#ifdef JAVASCRIPT_ENABLED
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#include "core/string/ustring.h"
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#include "core/typedefs.h"
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#include <mono/metadata/loader.h>
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#include <mono/utils/mono-publib.h>
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#include <stdexcept>
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#include <type_traits>
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extern "C" {
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struct Mono_InterpMethodArguments {
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size_t ilen;
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void **iargs;
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size_t flen;
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double *fargs = nullptr;
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void **retval;
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size_t is_float_ret;
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//#ifdef TARGET_WASM
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void *sig = nullptr;
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//#endif
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};
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} // extern "C"
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namespace GDMonoWasmM2n {
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template <typename T, size_t Size>
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struct array {
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T elems[Size];
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};
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template <typename T>
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constexpr char get_m2n_cookie_impl() {
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#define M2N_REG_COOKIE(m_type, m_cookie) \
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if constexpr (std::is_same_v<m_type, T>) { \
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return m_cookie; \
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}
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M2N_REG_COOKIE(MonoBoolean, 'I');
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M2N_REG_COOKIE(int8_t, 'I');
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M2N_REG_COOKIE(uint8_t, 'I');
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M2N_REG_COOKIE(int16_t, 'I');
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M2N_REG_COOKIE(uint16_t, 'I');
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M2N_REG_COOKIE(int32_t, 'I');
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M2N_REG_COOKIE(uint32_t, 'I');
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M2N_REG_COOKIE(int64_t, 'L');
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M2N_REG_COOKIE(uint64_t, 'L');
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M2N_REG_COOKIE(float, 'F');
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M2N_REG_COOKIE(double, 'D');
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if constexpr (std::is_pointer_v<T>) {
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if constexpr (sizeof(void *) == 4) {
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return 'I';
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} else {
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return 'L';
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}
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}
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if constexpr (std::is_void_v<T>) {
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return 'V';
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}
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return 'X';
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#undef M2N_REG_COOKIE
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}
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template <typename T>
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constexpr char get_m2n_cookie() {
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constexpr char cookie = get_m2n_cookie_impl<T>();
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static_assert(cookie != 'X', "Type not supported in internal call signature.");
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return cookie;
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}
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template <typename... T>
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constexpr array<const char, sizeof...(T) + 2> get_m2n_cookies() {
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return array<const char, sizeof...(T) + 2>{ 'V', get_m2n_cookie<T>()..., '\0' };
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}
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template <typename R, typename... T>
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constexpr array<const char, sizeof...(T) + 2> get_m2n_cookies_r() {
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return array<const char, sizeof...(T) + 2>{ get_m2n_cookie<R>(), get_m2n_cookie<T>()..., '\0' };
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}
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template <typename T>
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constexpr size_t calc_m2n_index(size_t &r_int_idx, size_t &r_float_idx) {
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constexpr char cookie = get_m2n_cookie<T>();
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static_assert(cookie == 'I' || cookie == 'L' || cookie == 'F' || cookie == 'D');
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if constexpr (cookie == 'I' || cookie == 'L') {
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size_t ret = r_int_idx;
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r_int_idx += cookie == 'I' ? 1 : 2;
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return ret;
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} else {
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size_t ret = r_float_idx;
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r_float_idx += cookie == 'F' ? 1 : 2;
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return ret;
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}
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}
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template <typename... P>
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constexpr array<size_t, sizeof...(P)> get_indices_for_type() {
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size_t int_idx = 0;
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size_t float_idx = 0;
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return array<size_t, sizeof...(P)>{ calc_m2n_index<P>(int_idx, float_idx)... };
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}
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constexpr size_t fidx(size_t p_x) {
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if constexpr (sizeof(void *) == 4) {
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return p_x * 2;
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} else {
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return p_x;
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}
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}
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template <typename T>
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T m2n_arg_cast(Mono_InterpMethodArguments *p_margs, size_t p_idx) {
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constexpr char cookie = get_m2n_cookie<T>();
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static_assert(cookie == 'I' || cookie == 'L' || cookie == 'F' || cookie == 'D');
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if constexpr (cookie == 'I') {
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return (T)(size_t)p_margs->iargs[p_idx];
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} else if constexpr (cookie == 'L') {
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static_assert(std::is_same_v<T, int64_t> || std::is_same_v<T, uint64_t> ||
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(sizeof(void *) == 8 && std::is_pointer_v<T>),
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"Invalid type for cookie 'L'.");
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union {
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T l;
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struct {
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int32_t lo;
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int32_t hi;
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} pair;
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} p;
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p.pair.lo = (int32_t)(size_t)p_margs->iargs[p_idx];
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p.pair.hi = (int32_t)(size_t)p_margs->iargs[p_idx + 1];
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return p.l;
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} else if constexpr (cookie == 'F') {
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return *reinterpret_cast<float *>(&p_margs->fargs[fidx(p_idx)]);
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} else if constexpr (cookie == 'D') {
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return (T)p_margs->fargs[p_idx];
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}
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}
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template <typename... P, size_t... Is>
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void m2n_trampoline_with_idx_seq(void *p_target_func, Mono_InterpMethodArguments *p_margs, IndexSequence<Is...>) {
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constexpr array<size_t, sizeof...(P)> indices = get_indices_for_type<P...>();
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typedef void (*Func)(P...);
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Func func = (Func)p_target_func;
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func(m2n_arg_cast<P>(p_margs, indices.elems[Is])...);
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}
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template <typename R, typename... P, size_t... Is>
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void m2n_trampoline_with_idx_seq_r(void *p_target_func, Mono_InterpMethodArguments *p_margs, IndexSequence<Is...>) {
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constexpr array<size_t, sizeof...(P)> indices = get_indices_for_type<P...>();
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typedef R (*Func)(P...);
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Func func = (Func)p_target_func;
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R res = func(m2n_arg_cast<P>(p_margs, indices.elems[Is])...);
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*reinterpret_cast<R *>(p_margs->retval) = res;
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}
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inline void m2n_trampoline_with_idx_seq_0(void *p_target_func, Mono_InterpMethodArguments *p_margs) {
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typedef void (*Func)();
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Func func = (Func)p_target_func;
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func();
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}
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template <typename R>
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void m2n_trampoline_with_idx_seq_r0(void *p_target_func, Mono_InterpMethodArguments *p_margs) {
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typedef R (*Func)();
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Func func = (Func)p_target_func;
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R res = func();
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*reinterpret_cast<R *>(p_margs->retval) = res;
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}
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template <typename... P>
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void m2n_trampoline(void *p_target_func, Mono_InterpMethodArguments *p_margs) {
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if constexpr (sizeof...(P) == 0) {
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m2n_trampoline_with_idx_seq_0(p_target_func, p_margs);
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} else {
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m2n_trampoline_with_idx_seq<P...>(p_target_func, p_margs, BuildIndexSequence<sizeof...(P)>{});
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}
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}
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template <typename R, typename... P>
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void m2n_trampoline_r(void *p_target_func, Mono_InterpMethodArguments *p_margs) {
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if constexpr (sizeof...(P) == 0) {
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m2n_trampoline_with_idx_seq_r0<R>(p_target_func, p_margs);
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} else {
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m2n_trampoline_with_idx_seq_r<R, P...>(p_target_func, p_margs, BuildIndexSequence<sizeof...(P)>{});
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}
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}
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typedef void (*TrampolineFunc)(void *p_target_func, Mono_InterpMethodArguments *p_margs);
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void set_trampoline(const char *cookies, TrampolineFunc trampoline_func);
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void lazy_initialize();
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template <typename... P>
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struct ICallTrampolines {
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static constexpr auto cookies = get_m2n_cookies<P...>();
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static void add() {
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lazy_initialize();
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set_trampoline(cookies.elems, &m2n_trampoline<P...>);
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}
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};
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template <typename R, typename... P>
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struct ICallTrampolinesR {
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static constexpr auto cookies = get_m2n_cookies_r<R, P...>();
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static void add() {
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lazy_initialize();
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set_trampoline(cookies.elems, &m2n_trampoline_r<R, P...>);
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}
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};
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void initialize();
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} // namespace GDMonoWasmM2n
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#endif
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#endif // GD_MONO_WASM_M2N_H
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