class TracePacket

Defined at line 39 of file ../../third_party/perfetto/include/perfetto/ext/tracing/core/trace_packet.h

A wrapper around a byte buffer that contains a protobuf-encoded TracePacket

(see trace_packet.proto). The TracePacket is decoded only if the Consumer

requests that. This is to allow Consumer(s) to just stream the packet over

the network or save it to a file without wasting time decoding it and without

needing to depend on libprotobuf or the trace_packet.pb.h header.

If the packets are saved / streamed and not just consumed locally, consumers

should ensure to preserve the unknown fields in the proto. A consumer, in

fact, might have an older version .proto which is newer on the producer.

Public Members

static const uint32_t kPacketFieldNumber

static const size_t kMaxPreambleBytes

void TracePacket ()

void ~TracePacket ()

void TracePacket (TracePacket && )

TracePacket & operator= (TracePacket && )

void AddSlice (Slice )

Mutator, used only by the service and tests.

void AddSlice (const void * start, size_t size)

Does not copy / take ownership of the memory of the slice. The TracePacket

will be valid only as long as the original buffer is valid.

std::tuple<char *, size_t> GetProtoPreamble ()

Generates a protobuf preamble suitable to represent this packet as a

repeated field within a root trace.proto message.

Returns a pointer to a buffer, owned by this class, containing the preamble

and its size.

std::string GetRawBytesForTesting ()

Returns the raw protobuf bytes of the slices, all stitched together into

a string. Only for testing.

const Slices & slices ()

Accesses all the raw slices in the packet, for saving them to file/network.

Defined at line 55 of file ../../third_party/perfetto/include/perfetto/ext/tracing/core/trace_packet.h

size_t size ()

Total size of all slices.

Defined at line 65 of file ../../third_party/perfetto/include/perfetto/ext/tracing/core/trace_packet.h

std::optional<uint32_t> buffer_index_for_stats ()

Remembers the buffer index where this packet was taken from. This is

usually populated for packets from a TraceBuffer, not synthetic ones.

Defined at line 79 of file ../../third_party/perfetto/include/perfetto/ext/tracing/core/trace_packet.h

void set_buffer_index_for_stats (uint32_t v)

Defined at line 84 of file ../../third_party/perfetto/include/perfetto/ext/tracing/core/trace_packet.h