107 lines
2.9 KiB
C++
107 lines
2.9 KiB
C++
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/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <folly/ExceptionWrapper.h>
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#include <iostream>
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#include <folly/GLog.h>
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namespace folly {
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exception_wrapper::VTable const exception_wrapper::uninit_{
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&noop_<void, exception_wrapper const*, exception_wrapper*>,
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&noop_<void, exception_wrapper*, exception_wrapper*>,
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&noop_<void, exception_wrapper*>,
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&noop_<void, exception_wrapper const*>,
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&uninit_type_,
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&noop_<std::exception const*, exception_wrapper const*>,
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&noop_<exception_wrapper, exception_wrapper const*>};
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exception_wrapper::VTable const exception_wrapper::ExceptionPtr::ops_{
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copy_,
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move_,
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delete_,
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throw_,
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type_,
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get_exception_,
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get_exception_ptr_};
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exception_wrapper::VTable const exception_wrapper::SharedPtr::ops_{
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copy_,
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move_,
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delete_,
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throw_,
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type_,
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get_exception_,
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get_exception_ptr_};
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namespace {
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std::exception const* get_std_exception_(std::exception_ptr eptr) noexcept {
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try {
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std::rethrow_exception(eptr);
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} catch (const std::exception& ex) {
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return &ex;
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} catch (...) {
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return nullptr;
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}
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}
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} // namespace
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exception_wrapper exception_wrapper::from_exception_ptr(
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std::exception_ptr const& ptr) noexcept {
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if (!ptr) {
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return exception_wrapper();
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}
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try {
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std::rethrow_exception(ptr);
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} catch (std::exception& e) {
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return exception_wrapper(std::current_exception(), e);
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} catch (...) {
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return exception_wrapper(std::current_exception());
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}
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}
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exception_wrapper::exception_wrapper(std::exception_ptr ptr) noexcept
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: exception_wrapper{} {
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if (ptr) {
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if (auto e = get_std_exception_(ptr)) {
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LOG(DFATAL)
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<< "Performance error: Please construct exception_wrapper with a "
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"reference to the std::exception along with the "
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"std::exception_ptr.";
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*this = exception_wrapper{std::move(ptr), *e};
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} else {
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Unknown uk;
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*this = exception_wrapper{ptr, uk};
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}
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}
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}
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[[noreturn]] void exception_wrapper::onNoExceptionError(
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char const* const name) {
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std::ios_base::Init ioinit_; // ensure std::cerr is alive
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std::cerr << "Cannot use `" << name
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<< "` with an empty folly::exception_wrapper" << std::endl;
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std::terminate();
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}
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fbstring exceptionStr(exception_wrapper const& ew) {
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return ew.what();
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}
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} // namespace folly
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