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[Runtime] Enhance PackedFunc Metaprogramming with PackArgs #15595

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Aug 20, 2023
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[Runtime] Enhance PackedFunc Metaprogramming with PackArgs #15595

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55 changes: 44 additions & 11 deletions include/tvm/runtime/packed_func.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1284,13 +1284,27 @@ namespace parameter_pack {

template <typename... EnumArgs>
struct EnumeratedParamPack {
struct Invoke {
template <template <size_t i, typename TArgument> class Functor, typename... ExtraParams>
static void F(ExtraParams&&... extra_params) {
struct InvokeWithoutArg {
template <template <size_t i, typename TArgument> class Functor, typename ExtraParams>
static void F(ExtraParams&& extra_params) {
using TExpander = int[];
(void)TExpander{
0,
(Functor<EnumArgs::i, typename EnumArgs::T>::F(extra_params...), 0)...,
(Functor<EnumArgs::i, typename EnumArgs::T>::F(std::forward<ExtraParams>(extra_params)),
0)...,
};
}
};
struct InvokeWithArg {
template <template <size_t i, typename TArgument> class Functor, typename ExtraParams,
typename... Params>
static void F(ExtraParams&& extra_params, Params&&... params) {
using TExpander = int[];
(void)TExpander{
0,
(Functor<EnumArgs::i, typename EnumArgs::T>::F(std::forward<ExtraParams>(extra_params),
std::forward<Params>(params)),
0)...,
};
}
};
Expand All @@ -1310,22 +1324,27 @@ struct EnumerateImpl {

template <std::size_t... id>
struct Zipper<std::integer_sequence<std::size_t, id...>> {
using T = EnumeratedParamPack<Item<id, Args>...>;
using WithoutArg = typename EnumeratedParamPack<Item<id, Args>...>::InvokeWithoutArg;
using WithArg = typename EnumeratedParamPack<Item<id, Args>...>::InvokeWithArg;
};

public:
using T = typename Zipper<std::index_sequence_for<Args...>>::T;
using WithoutArg = typename Zipper<std::index_sequence_for<Args...>>::WithoutArg;
using WithArg = typename Zipper<std::index_sequence_for<Args...>>::WithArg;
};

template <typename... Args>
using Enumerate = typename EnumerateImpl<Args...>::T;
using EnumerateWithoutArg = typename EnumerateImpl<Args...>::WithoutArg;

template <typename... Args>
using EnumerateWithArg = typename EnumerateImpl<Args...>::WithArg;

template <typename... Args>
struct ParamPack {
template <template <size_t i, typename TArgument> class Functor, typename... ExtraParams>
static void InvokeWithoutArg(ExtraParams&&... extra_params) {
Enumerate<Args...>::Invoke::template F<Functor, ExtraParams...>(
std::forward<ExtraParams>(extra_params)...);
template <template <size_t i, typename TArgument> class Functor, typename ExtraParams>
static void InvokeWithoutArg(ExtraParams&& extra_params) {
EnumerateWithoutArg<Args...>::template F<Functor, ExtraParams>(
std::forward<ExtraParams>(extra_params));
}
};

Expand Down Expand Up @@ -1622,6 +1641,20 @@ inline TVMRetValue PackedFunc::operator()(Args&&... args) const {
return rv;
}

template <int i, typename T>
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struct TVMArgsSetterApply {
static TVM_ALWAYS_INLINE void F(TVMArgsSetter* setter, T&& value) {
(*setter)(i, std::forward<T>(value));
}
};

template <typename... Args>
void TVM_ALWAYS_INLINE PackArgs(TVMValue* values, int* type_codes, Args&&... args) {
TVMArgsSetter setter(values, type_codes);
detail::parameter_pack::EnumerateWithArg<Args...>::template F<TVMArgsSetterApply>(
&setter, std::forward<Args>(args)...);
}

namespace detail {
template <typename R, int nleft, int index, typename F>
struct unpack_call_dispatcher {
Expand Down