| /* |
| * Copyright (C) 2017 The Android Open Source Project |
| * |
| * 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. |
| */ |
| |
| #ifndef INCLUDE_PERFETTO_EXT_TRACING_CORE_BASIC_TYPES_H_ |
| #define INCLUDE_PERFETTO_EXT_TRACING_CORE_BASIC_TYPES_H_ |
| |
| #include <stddef.h> |
| #include <stdint.h> |
| |
| #include "perfetto/ext/base/sys_types.h" |
| |
| namespace perfetto { |
| |
| // Unique within the scope of the tracing service. |
| using TracingSessionID = uint64_t; |
| |
| // Unique within the scope of the tracing service. |
| using ProducerID = uint16_t; |
| |
| // Unique within the scope of the tracing service. |
| using DataSourceInstanceID = uint64_t; |
| |
| // Unique within the scope of a Producer. |
| using WriterID = uint16_t; |
| |
| // Unique within the scope of the tracing service. |
| using FlushRequestID = uint64_t; |
| |
| // Combines Producer and Writer ID in one word which can be used as key for |
| // hashtables and other data structures. |
| using ProducerAndWriterID = uint32_t; |
| |
| inline ProducerAndWriterID MkProducerAndWriterID(ProducerID p, WriterID w) { |
| static_assert( |
| sizeof(ProducerID) + sizeof(WriterID) == sizeof(ProducerAndWriterID), |
| "MkProducerAndWriterID() and GetProducerAndWriterID() need updating"); |
| return (static_cast<ProducerAndWriterID>(p) << (sizeof(WriterID) * 8)) | w; |
| } |
| |
| inline void GetProducerAndWriterID(ProducerAndWriterID x, |
| ProducerID* p, |
| WriterID* w) { |
| static constexpr auto mask = (1ull << (sizeof(WriterID) * 8)) - 1; |
| *w = static_cast<WriterID>(x & mask); |
| *p = static_cast<ProducerID>(x >> (sizeof(WriterID) * 8)); |
| } |
| |
| // We need one FD per producer and we are not going to be able to keep > 64k FDs |
| // open in the service. |
| static constexpr ProducerID kMaxProducerID = static_cast<ProducerID>(-1); |
| |
| // 1024 Writers per producer seems a resonable bound. This reduces the ability |
| // to memory-DoS the service by having to keep track of too many writer IDs. |
| static constexpr WriterID kMaxWriterID = static_cast<WriterID>((1 << 10) - 1); |
| |
| // Unique within the scope of a {ProducerID, WriterID} tuple. |
| using ChunkID = uint32_t; |
| static constexpr ChunkID kMaxChunkID = static_cast<ChunkID>(-1); |
| |
| // Unique within the scope of the tracing service. |
| using BufferID = uint16_t; |
| |
| // Target buffer ID for SharedMemoryArbiter. Values up to max uint16_t are |
| // equivalent to a bound BufferID. Values above max uint16_t are reservation IDs |
| // for the target buffer of a startup trace writer. Reservation IDs will be |
| // translated to actual BufferIDs after they are bound by |
| // SharedMemoryArbiter::BindStartupTargetBuffer(). |
| // TODO(mohitms): Delete this type and use `struct {uint16 ; uint16;}` instead. |
| using MaybeUnboundBufferID = uint32_t; |
| |
| // Keep this in sync with SharedMemoryABI::PageHeader::target_buffer. |
| static constexpr BufferID kMaxTraceBufferID = static_cast<BufferID>(-1); |
| |
| // Unique within the scope of a tracing session. |
| using PacketSequenceID = uint32_t; |
| // Used for extra packets emitted by the service, such as statistics. |
| static constexpr PacketSequenceID kServicePacketSequenceID = 1; |
| static constexpr PacketSequenceID kMaxPacketSequenceID = |
| static_cast<PacketSequenceID>(-1); |
| |
| constexpr uid_t kInvalidUid = ::perfetto::base::kInvalidUid; |
| |
| constexpr uint32_t kDefaultFlushTimeoutMs = 5000; |
| |
| // The special id 0xffff..ffff represents the tracing session with the highest |
| // bugreport score. This is used for CloneSession(kBugreportSessionId). |
| constexpr TracingSessionID kBugreportSessionId = |
| static_cast<TracingSessionID>(-1); |
| |
| } // namespace perfetto |
| |
| #endif // INCLUDE_PERFETTO_EXT_TRACING_CORE_BASIC_TYPES_H_ |