82 lines
2.4 KiB
C
82 lines
2.4 KiB
C
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/* This file is part of the dynarmic project.
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* Copyright (c) 2018 MerryMage
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* SPDX-License-Identifier: 0BSD
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*/
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#pragma once
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#include <cstring>
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#include <utility>
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#include <mp/traits/function_info.h>
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#include "backend/x64/callback.h"
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#include "common/cast_util.h"
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#include "common/common_types.h"
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namespace Dynarmic {
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namespace Backend::X64 {
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namespace impl {
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template <typename FunctionType, FunctionType mfp>
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struct ThunkBuilder;
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template <typename C, typename R, typename... Args, R(C::*mfp)(Args...)>
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struct ThunkBuilder<R(C::*)(Args...), mfp> {
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static R Thunk(C* this_, Args... args) {
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return (this_->*mfp)(std::forward<Args>(args)...);
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}
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};
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} // namespace impl
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template<auto mfp>
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ArgCallback DevirtualizeGeneric(mp::class_type<decltype(mfp)>* this_) {
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return ArgCallback{&impl::ThunkBuilder<decltype(mfp), mfp>::Thunk, reinterpret_cast<u64>(this_)};
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}
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template<auto mfp>
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ArgCallback DevirtualizeWindows(mp::class_type<decltype(mfp)>* this_) {
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static_assert(sizeof(mfp) == 8);
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return ArgCallback{Common::BitCast<u64>(mfp), reinterpret_cast<u64>(this_)};
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}
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template<auto mfp>
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ArgCallback DevirtualizeItanium(mp::class_type<decltype(mfp)>* this_) {
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struct MemberFunctionPointer {
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/// For a non-virtual function, this is a simple function pointer.
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/// For a virtual function, it is (1 + virtual table offset in bytes).
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u64 ptr;
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/// The required adjustment to `this`, prior to the call.
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u64 adj;
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} mfp_struct = Common::BitCast<MemberFunctionPointer>(mfp);
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static_assert(sizeof(MemberFunctionPointer) == 16);
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static_assert(sizeof(MemberFunctionPointer) == sizeof(mfp));
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u64 fn_ptr = mfp_struct.ptr;
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u64 this_ptr = reinterpret_cast<u64>(this_) + mfp_struct.adj;
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if (mfp_struct.ptr & 1) {
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u64 vtable = Common::BitCastPointee<u64>(this_ptr);
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fn_ptr = Common::BitCastPointee<u64>(vtable + fn_ptr - 1);
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}
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return ArgCallback{fn_ptr, this_ptr};
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}
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template<auto mfp>
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ArgCallback Devirtualize(mp::class_type<decltype(mfp)>* this_) {
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#if defined(__APPLE__) || defined(linux) || defined(__linux) || defined(__linux__)
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return DevirtualizeItanium<mfp>(this_);
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#elif defined(__MINGW64__)
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return DevirtualizeItanium<mfp>(this_);
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#elif defined(_WIN32)
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return DevirtualizeWindows<mfp>(this_);
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#else
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return DevirtualizeGeneric<mfp>(this_);
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#endif
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}
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} // namespace Backend::X64
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} // namespace Dynarmic
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