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devirtualize: Devirtualize Itanium ABI MFPs at runtime

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This commit is contained in:
MerryMage 2018-02-07 12:24:42 +00:00
parent afe16fa0f3
commit f808a0fbde
1 changed files with 31 additions and 2 deletions
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33
src/backend_x64/devirtualize.h
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@ -6,9 +6,12 @@
#pragma once
#include <cstring>
#include <memory>
#include "backend_x64/callback.h"
#include "common/assert.h"
#include "common/cast_util.h"
#include "common/common_types.h"
#include "common/mp.h"
@ -30,11 +33,37 @@ struct ThunkBuilder<R(C::*)(Args...), mfp> {
} // namespace impl
template <typename FunctionType, FunctionType mfp>
ArgCallback Devirtualize(mp::class_type_t<FunctionType>* this_) {
ArgCallback DevirtualizeGeneric(mp::class_type_t<FunctionType>* this_) {
return ArgCallback{&impl::ThunkBuilder<FunctionType, mfp>::Thunk, reinterpret_cast<u64>(this_)};
}
#define DEVIRT(this_, mfp) Dynarmic::BackendX64::Devirtualize<decltype(mfp), mfp>(this_)
template <typename FunctionType, FunctionType mfp>
ArgCallback DevirtualizeItanium(mp::class_type_t<FunctionType>* this_) {
struct MemberFunctionPointer {
/// For a non-virtual function, this is a simple function pointer.
/// For a virtual function, it is (1 + virtual table offset in bytes).
u64 ptr;
/// The required adjustment to `this`, prior to the call.
u64 adj;
} mfp_struct = Common::BitCast<MemberFunctionPointer>(mfp);
static_assert(sizeof(MemberFunctionPointer) == 16);
static_assert(sizeof(MemberFunctionPointer) == sizeof(mfp));
u64 fn_ptr = mfp_struct.ptr;
u64 this_ptr = reinterpret_cast<u64>(this_) + mfp_struct.adj;
if (mfp_struct.ptr & 1) {
u64 vtable = Common::BitCastPointee<u64>(this_ptr);
fn_ptr = Common::BitCastPointee<u64>(vtable + fn_ptr - 1);
}
return ArgCallback{fn_ptr, this_ptr};
}
#if defined(__APPLE__) || defined(linux) || defined(__linux) || defined(__linux__)
#define DEVIRT(this_, mfp) Dynarmic::BackendX64::DevirtualizeItanium<decltype(mfp), mfp>(this_)
#else
#define DEVIRT(this_, mfp) Dynarmic::BackendX64::DevirtualizeGeneric<decltype(mfp), mfp>(this_)
#endif
} // namespace BackendX64
} // namespace Dynarmic