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Switch jaxlib to use nanobind instead of pybind11.
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| Original file line number | Diff line number | Diff line change |
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| /* Copyright 2023 The JAX Authors. | ||
| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
| http://www.apache.org/licenses/LICENSE-2.0 | ||
| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| ==============================================================================*/ | ||
|
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| #ifndef JAXLIB_ABSL_STATUS_CASTERS_H_ | ||
| #define JAXLIB_ABSL_STATUS_CASTERS_H_ | ||
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| #include "absl/status/status.h" | ||
| #include "absl/status/statusor.h" | ||
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| namespace jax { | ||
|
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| // C++ -> Python caster helpers. | ||
| // | ||
| // Failing statuses become Python exceptions; OK Status() becomes None. | ||
| // | ||
| // Given there can be only a single global pybind11 type_caster for the | ||
| // `absl::Status` type, and given XLA wants a custom exception being raised, | ||
| // we use a dedicated helper to implement this feature without relying on a | ||
| // global `type_caster`. | ||
| // | ||
| // For example: | ||
| // | ||
| // - Functions without arguments: | ||
| // m.def("my_func", []() { ThrowIfError(MyFunc()); } | ||
| // - Classes with a single argument: | ||
| // py_class.def("delete", [](Buffer& self) { | ||
| // ThrowIfError(self.Delete()); | ||
| // } | ||
| // | ||
| // For functions with more arguments, you can either inline the arguments, | ||
| // or use the `ThrowIfErrorWrapper` wrapper defined below: | ||
| // | ||
| // m.def("my_func", ThrowIfErrorWrapper(MyFunc)); | ||
| // | ||
| // Nonstatic member functions can be wrapped by passing a | ||
| // pointer-to-member-function: | ||
| // ThrowIfErrorWrapper(&MyClass::MyMethod) | ||
|
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| inline void ThrowIfError(absl::Status src) { | ||
| if (!src.ok()) { | ||
| throw std::runtime_error(src.ToString()); | ||
| } | ||
| } | ||
|
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||
| // If one does not want to have to define a lambda specifying the inputs | ||
| // arguments, on can use the `ThrowIfErrorWrapper` wrapper. | ||
| // | ||
| // There are three specializations: | ||
| // - For free functions, `Sig` is the function type and `F` is `Sig&`. | ||
| // - For callable types, `Sig` is the pointer to member function type | ||
| // and `F` is the type of the callable. | ||
| // - For a nonstatic member function of a class `C`, `Sig` is the function type | ||
| // and `F` is Sig C::*. | ||
| // | ||
| // In the first two cases, the wrapper returns a callable with signature `Sig`; | ||
| // in the third case, the wrapper returns callable with a modified signature | ||
| // that takes a C instance as the first argument. | ||
| template <typename Sig, typename F> | ||
| struct ThrowIfErrorWrapper; | ||
|
|
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| // C++17 "deduction guide" that guides class template argument deduction (CTAD) | ||
| // For free functions. | ||
| template <typename F> | ||
| ThrowIfErrorWrapper(F) -> ThrowIfErrorWrapper<decltype(&F::operator()), F>; | ||
|
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| // For callable types (with operator()). | ||
| template <typename... Args> | ||
| ThrowIfErrorWrapper(absl::Status (&)(Args...)) | ||
| -> ThrowIfErrorWrapper<absl::Status(Args...), absl::Status (&)(Args...)>; | ||
|
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| // For unbound nonstatic member functions. | ||
| template <typename C, typename... Args> | ||
| ThrowIfErrorWrapper(absl::Status (C::*)(Args...)) | ||
| -> ThrowIfErrorWrapper<absl::Status(Args...), C>; | ||
|
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||
| // Template specializations. | ||
|
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| // For free functions. | ||
| template <typename... Args> | ||
| struct ThrowIfErrorWrapper<absl::Status(Args...), absl::Status (&)(Args...)> { | ||
| explicit ThrowIfErrorWrapper(absl::Status (&f)(Args...)) : func(f) {} | ||
| void operator()(Args... args) { | ||
| ThrowIfError(func(std::forward<Args>(args)...)); | ||
| } | ||
| absl::Status (&func)(Args...); | ||
| }; | ||
|
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| // For callable types (with operator()), non-const and const versions. | ||
| template <typename C, typename... Args, typename F> | ||
| struct ThrowIfErrorWrapper<absl::Status (C::*)(Args...), F> { | ||
| explicit ThrowIfErrorWrapper(F&& f) : func(std::move(f)) {} | ||
| void operator()(Args... args) { | ||
| ThrowIfError(func(std::forward<Args>(args)...)); | ||
| } | ||
| F func; | ||
| }; | ||
| template <typename C, typename... Args, typename F> | ||
| struct ThrowIfErrorWrapper<absl::Status (C::*)(Args...) const, F> { | ||
| explicit ThrowIfErrorWrapper(F&& f) : func(std::move(f)) {} | ||
| void operator()(Args... args) const { | ||
| ThrowIfError(func(std::forward<Args>(args)...)); | ||
| } | ||
| F func; | ||
| }; | ||
|
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| // For unbound nonstatic member functions, non-const and const versions. | ||
| // `ptmf` stands for "pointer to member function". | ||
| template <typename C, typename... Args> | ||
| struct ThrowIfErrorWrapper<absl::Status(Args...), C> { | ||
| explicit ThrowIfErrorWrapper(absl::Status (C::*ptmf)(Args...)) : ptmf(ptmf) {} | ||
| void operator()(C& instance, Args... args) { | ||
| ThrowIfError((instance.*ptmf)(std::forward<Args>(args)...)); | ||
| } | ||
| absl::Status (C::*ptmf)(Args...); | ||
| }; | ||
| template <typename C, typename... Args> | ||
| struct ThrowIfErrorWrapper<absl::Status(Args...) const, C> { | ||
| explicit ThrowIfErrorWrapper(absl::Status (C::*ptmf)(Args...) const) | ||
| : ptmf(ptmf) {} | ||
| void operator()(const C& instance, Args... args) const { | ||
| ThrowIfError((instance.*ptmf)(std::forward<Args>(args)...)); | ||
| } | ||
| absl::Status (C::*ptmf)(Args...) const; | ||
| }; | ||
|
|
||
| // Utilities for `StatusOr`. | ||
| template <typename T> | ||
| T ValueOrThrow(absl::StatusOr<T> v) { | ||
| if (!v.ok()) { | ||
| throw std::runtime_error(v.status().ToString()); | ||
| } | ||
| return std::move(v).value(); | ||
| } | ||
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| template <typename Sig, typename F> | ||
| struct ValueOrThrowWrapper; | ||
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| template <typename F> | ||
| ValueOrThrowWrapper(F) -> ValueOrThrowWrapper<decltype(&F::operator()), F>; | ||
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| template <typename R, typename... Args> | ||
| ValueOrThrowWrapper(absl::StatusOr<R> (&)(Args...)) | ||
| -> ValueOrThrowWrapper<absl::StatusOr<R>(Args...), | ||
| absl::StatusOr<R> (&)(Args...)>; | ||
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| template <typename C, typename R, typename... Args> | ||
| ValueOrThrowWrapper(absl::StatusOr<R> (C::*)(Args...)) | ||
| -> ValueOrThrowWrapper<absl::StatusOr<R>(Args...), C>; | ||
|
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| // Deduction guide for const methods. | ||
| template <typename C, typename R, typename... Args> | ||
| ValueOrThrowWrapper(absl::StatusOr<R> (C::*)(Args...) const) | ||
| -> ValueOrThrowWrapper<absl::StatusOr<R>(Args...) const, C>; | ||
|
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| template <typename R, typename... Args> | ||
| struct ValueOrThrowWrapper<absl::StatusOr<R>(Args...), | ||
| absl::StatusOr<R> (&)(Args...)> { | ||
| explicit ValueOrThrowWrapper(absl::StatusOr<R> (&f)(Args...)) : func(f) {} | ||
| R operator()(Args... args) const { | ||
| return ValueOrThrow(func(std::forward<Args>(args)...)); | ||
| } | ||
| absl::StatusOr<R> (&func)(Args...); | ||
| }; | ||
| template <typename R, typename C, typename... Args, typename F> | ||
| struct ValueOrThrowWrapper<absl::StatusOr<R> (C::*)(Args...), F> { | ||
| explicit ValueOrThrowWrapper(F&& f) : func(std::move(f)) {} | ||
| R operator()(Args... args) const { | ||
| return ValueOrThrow(func(std::forward<Args>(args)...)); | ||
| } | ||
| F func; | ||
| }; | ||
| template <typename R, typename C, typename... Args, typename F> | ||
| struct ValueOrThrowWrapper<absl::StatusOr<R> (C::*)(Args...) const, F> { | ||
| explicit ValueOrThrowWrapper(F&& f) : func(std::move(f)) {} | ||
| R operator()(Args... args) const { | ||
| return ValueOrThrow(func(std::forward<Args>(args)...)); | ||
| } | ||
| F func; | ||
| }; | ||
|
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||
| // For unbound nonstatic member functions, non-const and const versions. | ||
| // `ptmf` stands for "pointer to member function". | ||
| template <typename R, typename C, typename... Args> | ||
| struct ValueOrThrowWrapper<absl::StatusOr<R>(Args...), C> { | ||
| explicit ValueOrThrowWrapper(absl::StatusOr<R> (C::*ptmf)(Args...)) | ||
| : ptmf(ptmf) {} | ||
| R operator()(C& instance, Args... args) { | ||
| return ValueOrThrow((instance.*ptmf)(std::forward<Args>(args)...)); | ||
| } | ||
| absl::StatusOr<R> (C::*ptmf)(Args...); | ||
| }; | ||
| template <typename R, typename C, typename... Args> | ||
| struct ValueOrThrowWrapper<absl::StatusOr<R>(Args...) const, C> { | ||
| explicit ValueOrThrowWrapper(absl::StatusOr<R> (C::*ptmf)(Args...) const) | ||
| : ptmf(ptmf) {} | ||
| R operator()(const C& instance, Args... args) const { | ||
| return ValueOrThrow((instance.*ptmf)(std::forward<Args>(args)...)); | ||
| } | ||
| absl::StatusOr<R> (C::*ptmf)(Args...) const; | ||
| }; | ||
|
|
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| } // namespace jax | ||
|
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| #endif // JAXLIB_ABSL_STATUS_CASTERS_H_ |
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