mirror of
https://github.com/geode-sdk/geode.git
synced 2024-11-27 09:55:34 -05:00
255 lines
No EOL
9.4 KiB
C++
255 lines
No EOL
9.4 KiB
C++
#ifndef GEODE_CORE_META_OPTCALL_HPP
|
|
#define GEODE_CORE_META_OPTCALL_HPP
|
|
|
|
#include "callconv.hpp"
|
|
#include "tuple.hpp"
|
|
#include "x86.hpp"
|
|
|
|
namespace geode::core::meta::x86 {
|
|
template <class Ret, class... Args>
|
|
class Optcall : public CallConv<Ret, Args...> {
|
|
private:
|
|
// Metaprogramming / typedefs we need for the rest of the class.
|
|
using MyConv = CallConv<Ret, Args...>;
|
|
|
|
private:
|
|
// These go in a class to not pollute the namespace.
|
|
class Sequences {
|
|
private:
|
|
// These are required for proper reordering.
|
|
static constexpr size_t length = sizeof...(Args);
|
|
|
|
static constexpr size_t SSES = 4;
|
|
static constexpr bool is_sse[length] = { sse_passable<Args>... };
|
|
|
|
static constexpr size_t GPRS = 2;
|
|
static constexpr bool is_gpr[length] = { gpr_passable<Args>... };
|
|
|
|
static constexpr auto reordered_arr = reorder_pack<Args...>();
|
|
|
|
// Setup call from our caller, to "foreign" function
|
|
static constexpr auto filter_to() {
|
|
/* The size of our output may be longer than the input.
|
|
* Also, annoyingly, we must make a lambda to calculate this.
|
|
*/
|
|
constexpr auto arr_size = []() -> size_t {
|
|
// Magic constant 2 is to pad XMM4 and XMM5: can't be used.
|
|
size_t size = length + SSES + 2;
|
|
|
|
/* We assume there are no SSES initially.
|
|
* Any SSES we encounter, we have to remove a "duplicate".
|
|
*/
|
|
for (size_t i = 0; i < SSES; ++i) {
|
|
if (i < length && is_sse[reordered_arr[i]]) {
|
|
--size;
|
|
}
|
|
}
|
|
|
|
return size;
|
|
};
|
|
std::array<size_t, arr_size()> to = {};
|
|
|
|
// This is the index of the placeholder float, for clobbering SSEs.
|
|
constexpr size_t CLOBBER_SSE = length;
|
|
|
|
// Put the SSEs into the right XMM registers, if they exist.
|
|
for (size_t i = 0; i < SSES; ++i) {
|
|
if (i < length && is_sse[reordered_arr[i]]) {
|
|
to[i] = reordered_arr[i];
|
|
}
|
|
else {
|
|
to[i] = CLOBBER_SSE;
|
|
}
|
|
}
|
|
|
|
// Clobber XMM4 and XMM5.
|
|
to[4] = CLOBBER_SSE;
|
|
to[5] = CLOBBER_SSE;
|
|
|
|
for (size_t in = 0, out = SSES + 2; in < length; ++in) {
|
|
// Put all the non SSEs in their correct places. Skip SSEs.
|
|
size_t current = reordered_arr[in];
|
|
if (!(is_sse[current] && in < SSES)) {
|
|
to[out] = current;
|
|
++out;
|
|
}
|
|
}
|
|
|
|
return to;
|
|
}
|
|
|
|
// Setup call from "foreign" function, to one of ours.
|
|
static constexpr auto filter_from() {
|
|
std::array<size_t, length> from = {};
|
|
|
|
for (size_t i = 0, gprs = 0, offset = 0; i < length; ++i) {
|
|
size_t current = reordered_arr[i];
|
|
if (is_sse[current] && i < SSES) {
|
|
// If in SSE, retain index
|
|
from[current] = i;
|
|
}
|
|
else if (is_gpr[current] && gprs < GPRS) {
|
|
// If in GPR, offset by 4 (4 SSE registers available)
|
|
from[current] = gprs + SSES;
|
|
++gprs;
|
|
}
|
|
else {
|
|
// If on stack, offset by 6 (4 SSE + 2 GPR registers available)
|
|
from[current] = offset + SSES + GPRS;
|
|
++offset;
|
|
}
|
|
}
|
|
|
|
return from;
|
|
}
|
|
|
|
// Grab only the stack values. For determining stack fixup.
|
|
static constexpr auto filter_stack() {
|
|
/* The size of our output may be shorter than the input.
|
|
* Again, annoyingly, we must make a lambda to calculate this.
|
|
*/
|
|
constexpr auto arr_size = []() -> size_t {
|
|
size_t size = length;
|
|
|
|
for (size_t i = 0, gprs = 0; i < length; ++i) {
|
|
size_t current = reordered_arr[i];
|
|
if (is_sse[current] && i < SSES) {
|
|
--size;
|
|
}
|
|
else if (is_gpr[current] && gprs < GPRS) {
|
|
--size;
|
|
++gprs;
|
|
}
|
|
}
|
|
|
|
return size;
|
|
};
|
|
std::array<size_t, arr_size()> stack = {};
|
|
|
|
for (size_t in = 0, out = 0, gprs = 0; in < length; ++in) {
|
|
size_t current = reordered_arr[in];
|
|
if ((!is_sse[current] || in >= SSES) && (!is_gpr[current] || gprs >= GPRS)) {
|
|
stack[out] = current;
|
|
++out;
|
|
}
|
|
|
|
if (is_gpr[current]) {
|
|
++gprs;
|
|
}
|
|
}
|
|
|
|
return stack;
|
|
}
|
|
|
|
// Annoyingly, unless we're using C++20, we can't eliminate these intermediates. (afaik)
|
|
static constexpr auto to_arr = filter_to();
|
|
static constexpr auto from_arr = filter_from();
|
|
static constexpr auto stack_arr = filter_stack();
|
|
|
|
public:
|
|
using to = typename MyConv::template arr_to_seq<to_arr>;
|
|
using from = typename MyConv::template arr_to_seq<from_arr>;
|
|
using stack = typename MyConv::template arr_to_seq<stack_arr>;
|
|
};
|
|
|
|
private:
|
|
// Where all the logic is actually implemented.
|
|
template <class Class, class, class>
|
|
class Impl {
|
|
static_assert(
|
|
always_false<Class>,
|
|
"Please report a bug to the Geode developers! This should never be reached.\n"
|
|
"SFINAE didn't reach the right overload!"
|
|
);
|
|
};
|
|
|
|
template <size_t... to, size_t... from, size_t... stack>
|
|
class Impl<
|
|
std::index_sequence<to...>, std::index_sequence<from...>,
|
|
std::index_sequence<stack...>> {
|
|
private:
|
|
static constexpr size_t fix = (std::is_class_v<Ret> ? stack_fix<Ret> : 0) +
|
|
stack_fix<typename Tuple<Args...>::template type_at<stack>...>;
|
|
|
|
public:
|
|
static Ret invoke(void* address, Tuple<Args..., float> const& all) {
|
|
if constexpr (!std::is_same_v<Ret, void>) {
|
|
Ret ret =
|
|
reinterpret_cast<Ret(__vectorcall*)(decltype(all.template at<to>())...)>(
|
|
address
|
|
)(all.template at<to>()...);
|
|
|
|
if constexpr (fix != 0) {
|
|
__asm add esp, [fix]
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
else {
|
|
reinterpret_cast<Ret(__vectorcall*)(decltype(all.template at<to>())...)>(address
|
|
)(all.template at<to>()...);
|
|
|
|
if constexpr (fix != 0) {
|
|
__asm add esp, [fix]
|
|
}
|
|
}
|
|
}
|
|
|
|
template <Ret (*detour)(Args...)>
|
|
static Ret __cdecl wrapper(
|
|
/* It's wrapped to stop MSVC from giving me error messages with internal compiler
|
|
* info. WTF.
|
|
*/
|
|
typename Tuple<Args...>::template type_at_wrap<stack>... rest
|
|
) {
|
|
Register<double> f0, f1, f2, f3;
|
|
Register<void*> i0, i1;
|
|
|
|
__asm {
|
|
movlpd f0, xmm0
|
|
movlpd f1, xmm1
|
|
movlpd f2, xmm2
|
|
movlpd f3, xmm3
|
|
|
|
mov i0, ecx
|
|
mov i1, edx
|
|
}
|
|
|
|
auto all = Tuple<>::make(f0, f1, f2, f3, i0, i1, rest...);
|
|
|
|
// Register<Type> has a explicit conversion operator we can take advantage of.
|
|
return detour(static_cast<Args>(all.template at<from>())...);
|
|
}
|
|
};
|
|
|
|
private:
|
|
// Putting it all together: instantiating Impl with our filters.
|
|
using MyImpl =
|
|
Impl<typename Sequences::to, typename Sequences::from, typename Sequences::stack>;
|
|
|
|
public:
|
|
// Just wrapping MyImpl.
|
|
static Ret invoke(void* address, Args... all) {
|
|
/* The extra float here is so that we can grab placeholders.
|
|
* If we don't have anything in XMM0 - 5, we will use
|
|
* this placeholder instead. The value is 314 to avoid unintentional
|
|
* bugs (since 0 may work coincidentally).
|
|
*/
|
|
return MyImpl::invoke(address, { all..., 314.0f });
|
|
}
|
|
|
|
template <Ret (*detour)(Args...)>
|
|
static auto get_wrapper() {
|
|
return reinterpret_cast<void*>(&MyImpl::template wrapper<detour>);
|
|
}
|
|
};
|
|
|
|
template <class Ret>
|
|
class Optcall<Ret> : public Cdecl<Ret> {
|
|
public:
|
|
using Cdecl<Ret>::invoke;
|
|
using Cdecl<Ret>::get_wrapper;
|
|
};
|
|
}
|
|
|
|
#endif /* GEODE_CORE_META_OPTCALL_HPP */ |