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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/tracing/core/proto_zero_message_handle.h"
#include "base/logging.h"
#include "components/tracing/core/proto_zero_message.h"
namespace tracing {
namespace v2 {
namespace {
inline void FinalizeMessageIfSet(ProtoZeroMessage* message) {
if (message) {
message->Finalize();
#if DCHECK_IS_ON()
message->set_handle(nullptr);
#endif
}
}
} // namespace
ProtoZeroMessageHandleBase::ProtoZeroMessageHandleBase(
ProtoZeroMessage* message)
: message_(message) {
#if DCHECK_IS_ON()
message_->set_handle(this);
#endif
}
ProtoZeroMessageHandleBase::~ProtoZeroMessageHandleBase() {
FinalizeMessageIfSet(message_);
}
ProtoZeroMessageHandleBase::ProtoZeroMessageHandleBase(
ProtoZeroMessageHandleBase&& other) {
Move(&other);
}
ProtoZeroMessageHandleBase& ProtoZeroMessageHandleBase::operator=(
ProtoZeroMessageHandleBase&& other) {
// If the current handle was pointing to a message and is being reset to a new
// one, finalize the old message.
FinalizeMessageIfSet(message_);
Move(&other);
return *this;
}
void ProtoZeroMessageHandleBase::Move(ProtoZeroMessageHandleBase* other) {
// In theory other->message_ could be nullptr, if |other| is a handle that has
// been std::move-d (and hence empty). There isn't a legitimate use case for
// doing so, though. Therefore this case is deliberately ignored (if hit, it
// will manifest as a segfault when dereferencing |message_| below) to avoid a
// useless null-check.
message_ = other->message_;
other->message_ = nullptr;
#if DCHECK_IS_ON()
message_->set_handle(this);
#endif
}
} // namespace v2
} // namespace tracing
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