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04d873a27a
Summary: I frequently find myself forgetting how to make the compiler see that non-moved-from EDEN_BUG's destructor is noreturn, so add a simple throwException function to it. Reviewed By: simpkins Differential Revision: D7834182 fbshipit-source-id: f279b9ca24f90efb4ad3ac318606dbd2dd002665
81 lines
2.2 KiB
C++
81 lines
2.2 KiB
C++
/*
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* Copyright (c) 2016-present, Facebook, Inc.
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* All rights reserved.
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*
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* This source code is licensed under the BSD-style license found in the
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* LICENSE file in the root directory of this source tree. An additional grant
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* of patent rights can be found in the PATENTS file in the same directory.
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*
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*/
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#include "eden/fs/utils/Bug.h"
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#include <folly/Conv.h>
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#include <folly/ExceptionWrapper.h>
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#include <folly/logging/xlog.h>
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namespace {
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static std::atomic<int> edenBugDisabledCount{0};
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}
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namespace facebook {
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namespace eden {
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EdenBug::EdenBug(const char* file, int lineNumber)
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: file_(file), lineNumber_(lineNumber), message_("!!BUG!! ") {}
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EdenBug::EdenBug(EdenBug&& other) noexcept
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: file_(other.file_),
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lineNumber_(other.lineNumber_),
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message_(std::move(other.message_)) {
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other.throwOnDestruction_ = false;
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}
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EdenBug::~EdenBug() noexcept(false) {
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// If toException() has not been called, throw an exception on destruction.
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//
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// Throwing in a destructor is normally poor form, in case we were triggered
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// by stack unwinding of another exception. However our callers should
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// always use EdenBug objects as temporaries when they want the EDEN_BUG()
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// macro to throw directly. Therefore we shouldn't have been triggered
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// during stack unwinding of another exception.
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//
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// Callers should only ever store EdenBug objects if they plan to call
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// toException() on them.
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if (throwOnDestruction_) {
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throwException();
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}
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}
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folly::exception_wrapper EdenBug::toException() {
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logError();
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throwOnDestruction_ = false;
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return folly::exception_wrapper(std::runtime_error(message_));
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}
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void EdenBug::throwException() {
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toException().throw_exception();
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}
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void EdenBug::logError() {
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XLOG(CRITICAL) << "EDEN_BUG at " << file_ << ":" << lineNumber_ << ": "
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<< message_;
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#ifndef NDEBUG
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// Crash in debug builds.
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// However, allow test code to disable crashing so that we can exercise
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// EDEN_BUG() code paths in tests.
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if (edenBugDisabledCount.load() == 0) {
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XLOG(FATAL) << "crashing due to EDEN_BUG";
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}
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#endif
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}
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EdenBugDisabler::EdenBugDisabler() {
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++edenBugDisabledCount;
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}
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EdenBugDisabler::~EdenBugDisabler() {
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--edenBugDisabledCount;
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}
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} // namespace eden
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} // namespace facebook
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