mirror of
https://github.com/pocketpy/pocketpy
synced 2025-10-20 11:30:18 +00:00
672 lines
24 KiB
C++
672 lines
24 KiB
C++
#pragma once
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#include "cast.h"
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namespace pkbind {
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namespace impl {
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template <typename... Args>
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struct constructor {};
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template <typename Fn, typename Args = callable_args_t<Fn>>
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struct factory;
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template <typename Fn, typename... Args>
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struct factory<Fn, std::tuple<Args...>> {
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Fn fn;
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auto make() {
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using Self = callable_return_t<Fn>;
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return [fn = std::move(fn)](Self* self, Args... args) {
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new (self) Self(fn(args...));
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};
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}
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};
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} // namespace impl
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template <typename... Args>
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impl::constructor<Args...> init() {
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return {};
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}
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template <typename Fn>
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impl::factory<Fn> init(Fn&& fn) {
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return {std::forward<Fn>(fn)};
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}
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struct arg_with_default {
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const char* name;
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object value;
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};
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struct arg {
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const char* name;
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arg(const char* name) : name(name) {}
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template <typename T>
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arg_with_default operator= (T&& value) {
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return arg_with_default{name, cast(std::forward<T>(value))};
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}
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};
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struct kwargs_proxy {
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handle value;
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};
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struct args_proxy {
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handle value;
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kwargs_proxy operator* () { return kwargs_proxy{value}; }
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};
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template <typename Derived>
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args_proxy interface<Derived>::operator* () const {
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return args_proxy{handle(this->ptr())};
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}
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template <typename Derived>
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template <return_value_policy policy, typename... Args>
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object interface<Derived>::operator() (Args&&... args) const {
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py_push(ptr());
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py_pushnil();
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int argc = 0;
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int kwargsc = 0;
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auto foreach = [&](auto&& argument) {
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using type = std::decay_t<decltype(argument)>;
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if constexpr(std::is_constructible_v<handle, type>) {
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argc += 1;
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py_push(handle(argument).ptr());
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} else if constexpr(std::is_same_v<type, arg_with_default>) {
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kwargsc += 1;
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arg_with_default& default_ = argument;
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py_pushname(name(default_.name).index());
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py_push(default_.value.ptr());
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} else if constexpr(std::is_same_v<type, args_proxy>) {
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tuple args = argument.value.template cast<tuple>();
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for(auto arg: args) {
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argc += 1;
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py_push(arg.ptr());
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}
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} else if constexpr(std::is_same_v<type, kwargs_proxy>) {
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dict kwargs = argument.value.template cast<dict>();
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kwargs.apply([&](handle key, handle value) {
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kwargsc += 1;
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name name = key.cast<std::string_view>();
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py_pushname(name.index());
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py_push(value.ptr());
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});
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} else {
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argc += 1;
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py_push(pkbind::cast(std::forward<decltype(argument)>(argument), policy).ptr());
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}
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};
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(foreach(std::forward<Args>(args)), ...);
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raise_call<py_vectorcall>(argc, kwargsc);
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return object::from_ret();
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}
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class function : public object {
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PKBIND_TYPE_IMPL(object, function, tp_function);
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};
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namespace impl {
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template <typename Callable,
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typename Extra,
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typename Args = callable_args_t<Callable>,
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typename IndexSequence = std::make_index_sequence<std::tuple_size_v<Args>>>
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struct template_parser;
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class function_record {
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template <typename C, typename E, typename A, typename I>
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friend struct template_parser;
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using destructor_t = void (*)(function_record*);
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using wrapper_t = bool (*)(function_record&,
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std::vector<handle>&,
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std::vector<std::pair<handle, handle>>&,
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bool convert,
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handle parent);
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struct arguments_t {
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std::vector<std::string> names;
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std::vector<object> defaults;
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};
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public:
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template <typename Fn, typename... Extras>
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function_record(Fn&& f, const Extras&... extras) {
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using Callable = std::decay_t<Fn>;
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if constexpr(std::is_trivially_copyable_v<Callable> && sizeof(Callable) <= sizeof(buffer)) {
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// if the callable object is trivially copyable and the size is less than 16 bytes,
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// store it in the buffer
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new (buffer) auto(std::forward<Fn>(f));
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destructor = [](function_record* self) {
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reinterpret_cast<Callable*>(self->buffer)->~Callable();
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};
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} else {
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// otherwise, store it in the heap
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data = new auto(std::forward<Fn>(f));
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destructor = [](function_record* self) {
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delete static_cast<Callable*>(self->data);
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};
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}
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using Parser = template_parser<Callable, std::tuple<Extras...>>;
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Parser::initialize(*this, extras...);
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wrapper = Parser::call;
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}
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function_record(const function_record&) = delete;
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function_record& operator= (const function_record&) = delete;
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function_record(function_record&& other) noexcept {
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std::memcpy(this, &other, sizeof(function_record));
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std::memset(&other, 0, sizeof(function_record));
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}
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function_record& operator= (function_record&&) = delete;
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~function_record() {
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if(destructor) { destructor(this); }
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if(arguments) { delete arguments; }
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if(next) { delete next; }
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if(signature) { delete[] signature; }
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}
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void append(function_record* record) {
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function_record* p = this;
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while(p->next) {
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p = p->next;
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}
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p->next = record;
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}
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template <typename T>
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T& as() {
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if constexpr(std::is_trivially_copyable_v<T> && sizeof(T) <= sizeof(buffer)) {
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return *reinterpret_cast<T*>(buffer);
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} else {
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return *static_cast<T*>(data);
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}
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}
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static function_record& from(handle h) {
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auto slot = py_getslot(h.ptr(), 0);
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return *static_cast<function_record*>(py_touserdata(slot));
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}
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void operator() (int argc, handle stack) {
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function_record* p = this;
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bool has_self = argc == 3;
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std::vector<handle> args;
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handle self = py_offset(stack.ptr(), 0);
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if(has_self) { args.push_back(self); }
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auto tuple = py_offset(stack.ptr(), 0 + has_self);
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for(int i = 0; i < py_tuple_len(tuple); ++i) {
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args.push_back(py_tuple_getitem(tuple, i));
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}
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auto dict = steal<pkbind::dict>(py_offset(stack.ptr(), 1 + has_self));
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std::vector<std::pair<handle, handle>> kwargs;
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dict.apply([&](handle key, handle value) {
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kwargs.emplace_back(key, value);
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});
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// foreach function record and call the function with not convert
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while(p != nullptr) {
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auto result = p->wrapper(*p, args, kwargs, false, self);
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if(result) { return; }
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p = p->next;
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}
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p = this;
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// foreach function record and call the function with convert
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while(p != nullptr) {
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auto result = p->wrapper(*p, args, kwargs, true, self);
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if(result) { return; }
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p = p->next;
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}
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std::string msg = "no matching function found, function signature:\n";
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p = this;
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while(p != nullptr) {
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msg += " ";
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msg += p->signature;
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msg += "\n";
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p = p->next;
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}
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throw std::runtime_error(msg);
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}
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private:
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union {
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void* data;
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char buffer[16];
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};
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wrapper_t wrapper = nullptr;
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function_record* next = nullptr;
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arguments_t* arguments = nullptr;
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destructor_t destructor = nullptr;
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const char* signature = nullptr;
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return_value_policy policy = return_value_policy::automatic;
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};
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template <typename Fn, std::size_t... Is, typename... Args>
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void invoke(Fn&& fn,
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std::index_sequence<Is...>,
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std::tuple<type_caster<Args>...>& casters,
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return_value_policy policy,
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handle parent) {
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using underlying_type = std::decay_t<Fn>;
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using return_type = callable_return_t<underlying_type>;
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constexpr bool is_void = std::is_void_v<return_type>;
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constexpr bool is_member_function_pointer = std::is_member_function_pointer_v<underlying_type>;
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if constexpr(is_member_function_pointer) {
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// helper function to unpack the arguments to call the member pointer
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auto unpack = [&](class_type_t<underlying_type>& self, auto&... args) {
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return (self.*fn)(args...);
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};
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if constexpr(!is_void) {
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py_assign(py_retval(),
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pkbind::cast(unpack(std::get<Is>(casters).value()...), policy, parent).ptr());
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} else {
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unpack(std::get<Is>(casters).value()...);
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py_newnone(py_retval());
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}
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} else {
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if constexpr(!is_void) {
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py_assign(py_retval(),
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pkbind::cast(fn(std::get<Is>(casters).value()...), policy, parent).ptr());
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} else {
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fn(std::get<Is>(casters).value()...);
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py_newnone(py_retval());
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}
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}
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}
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template <typename Callable, typename... Extras, typename... Args, std::size_t... Is>
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struct template_parser<Callable,
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std::tuple<Extras...>,
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std::tuple<Args...>,
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std::index_sequence<Is...>> {
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using types = type_list<Args...>;
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/// count of the Callable parameters.
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constexpr inline static auto argc = types::size;
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// count the number of py::args and py::kwargs
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constexpr inline static auto args_count = types::template count<pkbind::args>;
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constexpr inline static auto kwargs_count = types::template count<pkbind::kwargs>;
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static_assert(args_count <= 1, "py::args can occur at most once");
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static_assert(kwargs_count <= 1, "py::kwargs can occur at most once");
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/// find the position of py::args and py::kwargs
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constexpr inline static auto args_pos = types::template find<pkbind::args>;
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constexpr inline static auto kwargs_pos = types::template find<pkbind::kwargs>;
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// FIXME: temporarily, args and kwargs must be at the end of the arguments list
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/// if have py::kwargs, it must be at the end of the arguments list.
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static_assert(kwargs_count == 0 || kwargs_pos == argc - 1,
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"py::kwargs must be the last parameter");
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/// if have py::args, it must be before py::kwargs or at the end of the arguments list.
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static_assert(args_count == 0 || args_pos == kwargs_pos - 1 || args_pos == argc - 1,
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"py::args must be before py::kwargs or at the end of the parameter list");
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using extras = type_list<Extras...>;
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// count the number of py::doc and py::return_value_policy
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constexpr inline static auto doc_count = extras::template count<const char*>;
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constexpr inline static auto policy_count = extras::template count<pkbind::return_value_policy>;
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static_assert(doc_count <= 1, "doc can occur at most once");
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static_assert(policy_count <= 1, "return_value_policy can occur at most once");
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constexpr inline static auto policy_pos = extras::template find<pkbind::return_value_policy>;
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constexpr inline static auto last_arg_without_default_pos =
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types::template find_last<pkbind::arg>;
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constexpr inline static auto first_arg_with_default_pos =
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types::template find<pkbind::arg_with_default>;
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static_assert(last_arg_without_default_pos < first_arg_with_default_pos ||
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first_arg_with_default_pos == -1,
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"parameter with default value must be after parameter without default value");
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/// count of named parameters(explicit with name).
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constexpr inline static auto named_only_argc = extras::template count<pkbind::arg>;
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constexpr inline static auto named_default_argc =
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extras::template count<pkbind::arg_with_default>;
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constexpr inline static auto named_argc = named_only_argc + named_default_argc;
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/// count of normal parameters(which are not py::args or py::kwargs).
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constexpr inline static auto normal_argc = argc - (args_pos != -1) - (kwargs_pos != -1);
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/// all parameters must either have no names or all must have names.
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static_assert(named_argc == 0 || named_argc == normal_argc,
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"all parameters must either have no names or all must have names.");
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static void initialize(function_record& record, const Extras&... extras) {
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auto extras_tuple = std::make_tuple(extras...);
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constexpr static bool has_named_args = (named_argc > 0);
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if constexpr(policy_pos != -1) { record.policy = std::get<policy_pos>(extras_tuple); }
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// TODO: set others
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// set default arguments
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if constexpr(has_named_args) {
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record.arguments = new function_record::arguments_t();
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auto add_arguments = [&](const auto& default_) {
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using type = remove_cvref_t<decltype(default_)>;
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if constexpr(std::is_same_v<arg, type>) {
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auto& arguments = *record.arguments;
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arguments.names.emplace_back(default_.name);
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arguments.defaults.emplace_back();
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} else if constexpr(std::is_same_v<arg_with_default, type>) {
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auto& arguments = *record.arguments;
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arguments.names.emplace_back(default_.name);
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arguments.defaults.emplace_back(std::move(default_.value));
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}
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};
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(add_arguments(extras), ...);
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}
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// set signature
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{
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std::string sig = "(";
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std::size_t index = 0;
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auto append = [&](auto _t) {
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using T = remove_cvref_t<typename decltype(_t)::type>;
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if constexpr(std::is_same_v<T, args>) {
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sig += "*args";
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} else if constexpr(std::is_same_v<T, kwargs>) {
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sig += "**kwargs";
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} else if constexpr(has_named_args) {
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sig += record.arguments->names[index].c_str();
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sig += ": ";
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sig += type_info::of<T>().name;
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if(!record.arguments->defaults[index].empty()) {
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sig += " = ";
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sig += record.arguments->defaults[index]
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.attr("__repr__")()
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.cast<std::string_view>();
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}
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} else {
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sig += "_: ";
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sig += type_info::of<T>().name;
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}
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if(index + 1 < argc) { sig += ", "; }
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index++;
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};
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(append(type_identity<Args>{}), ...);
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sig += ")";
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char* buffer = new char[sig.size() + 1];
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std::memcpy(buffer, sig.data(), sig.size());
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buffer[sig.size()] = '\0';
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record.signature = buffer;
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}
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}
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/// try to call a C++ function(store in function_record) with the arguments which are from
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/// Python. if success, return true, otherwise return false.
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static bool call(function_record& record,
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std::vector<handle>& args,
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std::vector<std::pair<handle, handle>>& kwargs,
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bool convert,
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handle parent) {
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// first, we try to load arguments into the stack.
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// use argc + 1 to avoid compile error when argc is 0.
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handle stack[argc + 1] = {};
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// if have default arguments, load them
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if constexpr(named_default_argc > 0) {
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auto& defaults = record.arguments->defaults;
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for(std::size_t i = named_only_argc; i < named_argc; ++i) {
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stack[i] = defaults[i];
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}
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}
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// load arguments from call arguments
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if(args.size() > normal_argc) {
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if constexpr(args_pos == -1) { return false; }
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}
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for(std::size_t i = 0; i < std::min(normal_argc, (int)args.size()); ++i) {
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stack[i] = args[i];
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}
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object repack_args;
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// pack the args
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if constexpr(args_pos != -1) {
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const auto n =
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static_cast<int>(args.size() > normal_argc ? args.size() - normal_argc : 0);
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auto pack = tuple(n);
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for(int i = 0; i < n; ++i) {
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pack[i] = args[normal_argc + i];
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}
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repack_args = std::move(pack);
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stack[args_pos] = repack_args;
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}
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// pack the kwargs
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int index = 0;
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if constexpr(named_argc != 0) {
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int arg_index = 0;
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while(arg_index < named_argc && index < kwargs.size()) {
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const auto name = kwargs[index].first;
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const auto value = kwargs[index].second;
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if(name.cast<std::string_view>() == record.arguments->names[arg_index]) {
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stack[arg_index] = value;
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index += 1;
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}
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arg_index += 1;
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}
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}
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object repacked_kwargs;
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if constexpr(kwargs_pos != -1) {
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auto pack = dict();
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while(index < kwargs.size()) {
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pack[kwargs[index].first] = kwargs[index].second;
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index += 1;
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}
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repacked_kwargs = std::move(pack);
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stack[kwargs_pos] = repacked_kwargs;
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}
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// check if all the arguments are valid
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for(std::size_t i = 0; i < argc; ++i) {
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if(!stack[i]) { return false; }
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}
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// ok, all the arguments are valid, call the function
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std::tuple<type_caster<Args>...> casters;
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if(((std::get<Is>(casters).load(stack[Is], convert)) && ...)) {
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invoke(record.as<Callable>(),
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std::index_sequence<Is...>{},
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casters,
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record.policy,
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parent);
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return true;
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}
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return false;
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}
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};
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|
|
|
} // namespace impl
|
|
|
|
class cpp_function : public function {
|
|
PKBIND_TYPE_IMPL(function, cpp_function, tp_function);
|
|
|
|
inline static lazy<py_Type> tp_function_record = +[](py_Type& type) {
|
|
type = py_newtype("function_record", tp_object, nullptr, [](void* data) {
|
|
static_cast<impl::function_record*>(data)->~function_record();
|
|
});
|
|
};
|
|
|
|
static bool is_function_record(handle h) {
|
|
if(isinstance<function>(h)) {
|
|
auto slot = py_getslot(h.ptr(), 0);
|
|
if(slot) { return py_typeof(slot) == tp_function_record; }
|
|
}
|
|
return false;
|
|
}
|
|
|
|
template <typename Fn, typename... Extras>
|
|
cpp_function(bool is_method, const char* name, Fn&& fn, const Extras&... extras) :
|
|
function(alloc_t{}) {
|
|
// bind the function
|
|
std::string sig = name;
|
|
sig += is_method ? "(self, *args, **kwargs)" : "(*args, **kwargs)";
|
|
|
|
py_newfunction(m_ptr, sig.c_str(), call, nullptr, 1);
|
|
auto slot = py_getslot(m_ptr, 0);
|
|
void* data = py_newobject(slot, tp_function_record, 0, sizeof(impl::function_record));
|
|
new (data) impl::function_record(std::forward<Fn>(fn), extras...);
|
|
}
|
|
|
|
private:
|
|
static bool call(int argc, py_Ref stack) {
|
|
handle func = py_inspect_currentfunction();
|
|
auto data = py_touserdata(py_getslot(func.ptr(), 0));
|
|
auto& record = *static_cast<impl::function_record*>(data);
|
|
try {
|
|
record(argc, stack);
|
|
return true;
|
|
} catch(std::domain_error& e) {
|
|
py_exception(tp_ValueError, e.what());
|
|
} catch(std::invalid_argument& e) {
|
|
py_exception(tp_ValueError, e.what());
|
|
} catch(std::length_error& e) {
|
|
py_exception(tp_ValueError, e.what());
|
|
} catch(std::out_of_range& e) {
|
|
py_exception(tp_IndexError, e.what());
|
|
} catch(std::range_error& e) {
|
|
py_exception(tp_ValueError, e.what());
|
|
} catch(stop_iteration&) { StopIteration(); } catch(index_error& e) {
|
|
py_exception(tp_IndexError, e.what());
|
|
} catch(key_error& e) { py_exception(tp_KeyError, e.what()); } catch(value_error& e) {
|
|
py_exception(tp_ValueError, e.what());
|
|
} catch(type_error& e) { py_exception(tp_TypeError, e.what()); } catch(import_error& e) {
|
|
py_exception(tp_ImportError, e.what());
|
|
} catch(error_already_set&) {
|
|
// exception already set, do nothing
|
|
} catch(attribute_error& e) {
|
|
py_exception(tp_AttributeError, e.what());
|
|
} catch(std::exception& e) { py_exception(tp_RuntimeError, e.what()); }
|
|
return false;
|
|
};
|
|
};
|
|
|
|
class property : public object {
|
|
PKBIND_TYPE_IMPL(object, property, tp_property);
|
|
|
|
property(handle getter, handle setter = none()) :
|
|
object(type::of<property>()(getter, setter)) {}
|
|
};
|
|
|
|
class staticmethod : public object {
|
|
PKBIND_TYPE_IMPL(object, staticmethod, tp_staticmethod);
|
|
|
|
staticmethod(handle method) : object(type::of<staticmethod>()(method)) {}
|
|
};
|
|
|
|
namespace impl {
|
|
|
|
template <bool is_method, bool is_static, typename Fn, typename... Extras>
|
|
void bind_function(handle obj, const char* name_, Fn&& fn, const Extras&... extras) {
|
|
constexpr bool has_named_args =
|
|
((std::is_same_v<Extras, arg> || std::is_same_v<Extras, arg_with_default>) || ...);
|
|
auto name = py_name(name_);
|
|
auto func = py_getdict(obj.ptr(), name);
|
|
|
|
if(func && cpp_function::is_function_record(func)) {
|
|
auto slot = py_getslot(func, 0);
|
|
auto& record = *static_cast<function_record*>(py_touserdata(slot));
|
|
if constexpr(has_named_args && is_method) {
|
|
record.append(new function_record(std::forward<Fn>(fn), arg("self"), extras...));
|
|
} else {
|
|
record.append(new function_record(std::forward<Fn>(fn), extras...));
|
|
}
|
|
} else {
|
|
if constexpr(is_static) {
|
|
py_setdict(
|
|
obj.ptr(),
|
|
name,
|
|
staticmethod(cpp_function(is_method, name_, std::forward<Fn>(fn), extras...).ptr())
|
|
.ptr());
|
|
} else {
|
|
if constexpr(has_named_args && is_method) {
|
|
py_setdict(
|
|
obj.ptr(),
|
|
name,
|
|
cpp_function(is_method, name_, std::forward<Fn>(fn), arg("self"), extras...)
|
|
.ptr());
|
|
} else {
|
|
py_setdict(obj.ptr(),
|
|
name,
|
|
cpp_function(is_method, name_, std::forward<Fn>(fn), extras...).ptr());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
template <typename Getter, typename Setter, typename... Extras>
|
|
void bind_property(handle obj,
|
|
const char* name,
|
|
Getter&& getter_,
|
|
Setter&& setter_,
|
|
const Extras&... extras) {
|
|
if constexpr(std::is_same_v<std::decay_t<Setter>, std::nullptr_t>) {
|
|
cpp_function getter(true,
|
|
name,
|
|
std::forward<Getter>(getter_),
|
|
return_value_policy::reference_internal,
|
|
extras...);
|
|
property prop(getter.ptr());
|
|
setattr(obj, name, prop);
|
|
} else {
|
|
cpp_function getter(true,
|
|
name,
|
|
std::forward<Getter>(getter_),
|
|
return_value_policy::reference_internal,
|
|
extras...);
|
|
cpp_function setter(true,
|
|
name,
|
|
std::forward<Setter>(setter_),
|
|
return_value_policy::reference_internal,
|
|
extras...);
|
|
property prop(getter.ptr(), setter.ptr());
|
|
setattr(obj, name, prop);
|
|
}
|
|
}
|
|
|
|
} // namespace impl
|
|
|
|
inline dict::dict(std::initializer_list<arg_with_default> args) : dict() {
|
|
for(auto& arg: args) {
|
|
this->operator[] (arg.name) = arg.value;
|
|
}
|
|
}
|
|
|
|
} // namespace pkbind
|