/*
 * Copyright (C) 2019 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.
 */

syntax = "proto2";

import "protos/perfetto/trace/track_event/debug_annotation.proto";
import "protos/perfetto/trace/track_event/log_message.proto";
import "protos/perfetto/trace/track_event/task_execution.proto";
import "protos/perfetto/trace/track_event/chrome_compositor_scheduler_state.proto";
import "protos/perfetto/trace/track_event/chrome_frame_reporter.proto";
import "protos/perfetto/trace/track_event/chrome_histogram_sample.proto";
import "protos/perfetto/trace/track_event/chrome_keyed_service.proto";
import "protos/perfetto/trace/track_event/chrome_latency_info.proto";
import "protos/perfetto/trace/track_event/chrome_legacy_ipc.proto";
import "protos/perfetto/trace/track_event/chrome_message_pump.proto";
import "protos/perfetto/trace/track_event/chrome_renderer_scheduler_state.proto";
import "protos/perfetto/trace/track_event/chrome_user_event.proto";
import "protos/perfetto/trace/track_event/source_location.proto";

package perfetto.protos;

// NOTE: Full TrackEvent support in the client lib and chrome is WIP, thus these
// protos are still subject to change. Don't depend on them staying as they are.

// Trace events emitted by client instrumentation library (TRACE_EVENT macros),
// which describe activity on a track, such as a thread or asynchronous event
// track. The track is specified using separate TrackDescriptor messages and
// referred to via the track's UUID.
//
// A simple TrackEvent packet specifies a timestamp, category, name and type:
//   trace_packet {
//     timestamp: 1000
//     track_event {
//       categories: ["my_cat"]
//       name: "my_event"
//       type: TYPE_INSTANT
//      }
//    }
//
// To associate an event with a custom track (e.g. a thread), the track is
// defined in a separate packet and referred to from the TrackEvent by its UUID:
//   trace_packet {
//     track_descriptor {
//       track_uuid: 1234
//       name: "my_track"
//
//       // Optionally, associate the track with a thread.
//       thread_descriptor {
//         pid: 10
//         tid: 10
//         ..
//       }
//     }
//   }
//
// A pair of TYPE_SLICE_BEGIN and _END events form a slice on the track:
//   trace_packet {
//     timestamp: 1200
//     track_event {
//       track_uuid: 1234
//       categories: ["my_cat"]
//       name: "my_slice"
//       type: TYPE_SLICE_BEGIN
//     }
//   }
//   trace_packet {
//     timestamp: 1400
//     track_event {
//       track_uuid: 1234
//       type: TYPE_SLICE_END
//     }
//   }
//
// TrackEvents also support optimizations to reduce data repetition and encoded
// data size, e.g. through data interning (names, categories, ...) and delta
// encoding of timestamps/counters. For details, see the InternedData message.
// Further, default values for attributes of events on the same sequence (e.g.
// their default track association) can be emitted as part of a
// TrackEventDefaults message.
//
// Next reserved id: 13 (up to 15). Next id: 41.
message TrackEvent {
  // Names of categories of the event. In the client library, categories are a
  // way to turn groups of individual events on or off.
  // interned EventCategoryName.
  repeated uint64 category_iids = 3;
  // non-interned variant.
  repeated string categories = 22;

  // Optional name of the event for its display in trace viewer. May be left
  // unspecified for events with typed arguments.
  //
  // Note that metrics should not rely on event names, as they are prone to
  // changing. Instead, they should use typed arguments to identify the events
  // they are interested in.
  oneof name_field {
    // interned EventName.
    uint64 name_iid = 10;
    // non-interned variant.
    string name = 23;
  }

  // TODO(eseckler): Support using binary symbols for category/event names.

  // Type of the TrackEvent (required if |phase| in LegacyEvent is not set).
  enum Type {
    TYPE_UNSPECIFIED = 0;

    // Slice events are events that have a begin and end timestamp, i.e. a
    // duration. They can be nested similar to a callstack: If, on the same
    // track, event B begins after event A, but before A ends, B is a child
    // event of A and will be drawn as a nested event underneath A in the UI.
    // Note that child events should always end before their parents (e.g. B
    // before A).
    //
    // Each slice event is formed by a pair of BEGIN + END events. The END event
    // does not need to repeat any TrackEvent fields it has in common with its
    // corresponding BEGIN event. Arguments and debug annotations of the BEGIN +
    // END pair will be merged during trace import.
    //
    // Note that we deliberately chose not to support COMPLETE events (which
    // would specify a duration directly) since clients would need to delay
    // writing them until the slice is completed, which can result in reordered
    // events in the trace and loss of unfinished events at the end of a trace.
    TYPE_SLICE_BEGIN = 1;
    TYPE_SLICE_END = 2;

    // Instant events are nestable events without duration. They can be children
    // of slice events on the same track.
    TYPE_INSTANT = 3;

    // Event that provides a value for a counter track. |track_uuid| should
    // refer to a counter track and |counter_value| set to the new value. Note
    // that most other TrackEvent fields (e.g. categories, name, ..) are not
    // supported for TYPE_COUNTER events. See also CounterDescriptor.
    TYPE_COUNTER = 4;
  }
  optional Type type = 9;

  // Identifies the track of the event. The default value may be overridden
  // using TrackEventDefaults, e.g., to specify the track of the TraceWriter's
  // sequence (in most cases sequence = one thread). If no value is specified
  // here or in TrackEventDefaults, the TrackEvent will be associated with an
  // implicit trace-global track (uuid 0). See TrackDescriptor::uuid.
  optional uint64 track_uuid = 11;

  // A new value for a counter track. |track_uuid| should refer to a track with
  // a CounterDescriptor, and |type| should be TYPE_COUNTER. For a more
  // efficient encoding of counter values that are sampled at the beginning/end
  // of a slice, see |extra_counter_values| and |extra_counter_track_uuids|.
  // Counter values can optionally be encoded in as delta values (positive or
  // negative) on each packet sequence (see CounterIncrementalBase).
  optional int64 counter_value = 30;

  // To encode counter values more efficiently, we support attaching additional
  // counter values to a TrackEvent of any type. All values will share the same
  // timestamp specified in the TracePacket. The value at
  // extra_counter_values[N] is for the counter track referenced by
  // extra_counter_track_uuids[N].
  //
  // |extra_counter_track_uuids| may also be set via TrackEventDefaults. There
  // should always be equal or more uuids than values. It is valid to set more
  // uuids (e.g. via defaults) than values. If uuids are specified in
  // TrackEventDefaults and a TrackEvent, the TrackEvent uuids override the
  // default uuid list.
  //
  // For example, this allows snapshotting the thread time clock at each
  // thread-track BEGIN and END event to capture the cpu time delta of a slice.
  repeated uint64 extra_counter_track_uuids = 31;
  repeated int64 extra_counter_values = 12;

  // TODO(eseckler): Add flow event support.

  // ---------------------------------------------------------------------------
  // TrackEvent arguments:
  // ---------------------------------------------------------------------------

  // Unstable key/value annotations shown in the trace viewer but not intended
  // for metrics use.
  repeated DebugAnnotation debug_annotations = 4;

  // Typed event arguments:
  optional TaskExecution task_execution = 5;
  optional LogMessage log_message = 21;
  optional ChromeCompositorSchedulerState cc_scheduler_state = 24;
  optional ChromeUserEvent chrome_user_event = 25;
  optional ChromeKeyedService chrome_keyed_service = 26;
  optional ChromeLegacyIpc chrome_legacy_ipc = 27;
  optional ChromeHistogramSample chrome_histogram_sample = 28;
  optional ChromeLatencyInfo chrome_latency_info = 29;
  optional ChromeFrameReporter chrome_frame_reporter = 32;
  optional ChromeRendererSchedulerState chrome_renderer_scheduler_state = 40;

  // This field is used only if the source location represents the function that
  // executes during this event.
  oneof source_location_field {
    // Non-interned field.
    SourceLocation source_location = 33;
    // TODO(ssid): The interned source locations are not parsed by trace
    // processor.
    // Interned field.
    uint64 source_location_iid = 34;
  }

  optional ChromeMessagePump chrome_message_pump = 35;

  // New argument types go here :)

  // Extension range for typed events defined externally.
  // See docs/design-docs/extensions.md for more details.
  //
  // Extension support is work-in-progress, in the future the way to reserve a
  // subrange for a particular project will be described here and in the design
  // document linked above.
  //
  // Contact perfetto-dev@googlegroups.com if you are interested in a subrange
  // for your project.

  // Extension range for future use.
  extensions 1000 to 9899;
  // Reserved for Perfetto unit and integration tests.
  extensions 9900 to 10000;

  // ---------------------------------------------------------------------------
  // Deprecated / legacy event fields, which will be removed in the future:
  // ---------------------------------------------------------------------------

  // Deprecated. Use the |timestamp| and |timestamp_clock_id| fields in
  // TracePacket instead.
  //
  // Timestamp in microseconds (usually CLOCK_MONOTONIC).
  oneof timestamp {
    // Delta timestamp value since the last TrackEvent or ThreadDescriptor. To
    // calculate the absolute timestamp value, sum up all delta values of the
    // preceding TrackEvents since the last ThreadDescriptor and add the sum to
    // the |reference_timestamp| in ThreadDescriptor. This value should always
    // be positive.
    int64 timestamp_delta_us = 1;
    // Absolute value (e.g. a manually specified timestamp in the macro).
    // This is a one-off value that does not affect delta timestamp computation
    // in subsequent TrackEvents.
    int64 timestamp_absolute_us = 16;
  }

  // Deprecated. Use |extra_counter_values| and |extra_counter_track_uuids| to
  // encode thread time instead.
  //
  // CPU time for the current thread (e.g., CLOCK_THREAD_CPUTIME_ID) in
  // microseconds.
  oneof thread_time {
    // Delta timestamp value since the last TrackEvent or ThreadDescriptor. To
    // calculate the absolute timestamp value, sum up all delta values of the
    // preceding TrackEvents since the last ThreadDescriptor and add the sum to
    // the |reference_timestamp| in ThreadDescriptor. This value should always
    // be positive.
    int64 thread_time_delta_us = 2;
    // This is a one-off absolute value that does not affect delta timestamp
    // computation in subsequent TrackEvents.
    int64 thread_time_absolute_us = 17;
  }

  // Deprecated. Use |extra_counter_values| and |extra_counter_track_uuids| to
  // encode thread instruction count instead.
  //
  // Value of the instruction counter for the current thread.
  oneof thread_instruction_count {
    // Same encoding as |thread_time| field above.
    int64 thread_instruction_count_delta = 8;
    int64 thread_instruction_count_absolute = 20;
  }

  // Apart from {category, time, thread time, tid, pid}, other legacy trace
  // event attributes are initially simply proxied for conversion to a JSON
  // trace. We intend to gradually transition these attributes to similar native
  // features in TrackEvent (e.g. async + flow events), or deprecate them
  // without replacement where transition is unsuitable.
  //
  // Next reserved id: 16 (up to 16).
  // Next id: 20.
  message LegacyEvent {
    // Deprecated, use TrackEvent::name(_iid) instead.
    // interned EventName.
    optional uint64 name_iid = 1;
    optional int32 phase = 2;
    optional int64 duration_us = 3;
    optional int64 thread_duration_us = 4;

    // Elapsed retired instruction count during the event.
    optional int64 thread_instruction_delta = 15;

    // used to be |flags|.
    reserved 5;

    oneof id {
      uint64 unscoped_id = 6;
      uint64 local_id = 10;
      uint64 global_id = 11;
    }
    // Additional optional scope for |id|.
    optional string id_scope = 7;

    // Consider the thread timestamps for async BEGIN/END event pairs as valid.
    optional bool use_async_tts = 9;

    // Idenfifies a flow. Flow events with the same bind_id are connected.
    optional uint64 bind_id = 8;
    // Use the enclosing slice as binding point for a flow end event instead of
    // the next slice. Flow start/step events always bind to the enclosing
    // slice.
    optional bool bind_to_enclosing = 12;

    enum FlowDirection {
      FLOW_UNSPECIFIED = 0;
      FLOW_IN = 1;
      FLOW_OUT = 2;
      FLOW_INOUT = 3;
    }
    optional FlowDirection flow_direction = 13;

    enum InstantEventScope {
      SCOPE_UNSPECIFIED = 0;
      SCOPE_GLOBAL = 1;
      SCOPE_PROCESS = 2;
      SCOPE_THREAD = 3;
    }
    optional InstantEventScope instant_event_scope = 14;

    // Override the pid/tid if the writer needs to emit events on behalf of
    // another process/thread. This should be the exception. Normally, the
    // pid+tid from ThreadDescriptor is used.
    optional int32 pid_override = 18;
    optional int32 tid_override = 19;
  }

  optional LegacyEvent legacy_event = 6;
}

// Default values for fields of all TrackEvents on the same packet sequence.
// Should be emitted as part of TracePacketDefaults whenever incremental state
// is cleared. It's defined here because field IDs should match those of the
// corresponding fields in TrackEvent.
message TrackEventDefaults {
  optional uint64 track_uuid = 11;
  repeated uint64 extra_counter_track_uuids = 31;

  // TODO(eseckler): Support default values for more TrackEvent fields.
}

// --------------------
// Interned data types:
// --------------------

message EventCategory {
  optional uint64 iid = 1;
  optional string name = 2;
}

message EventName {
  optional uint64 iid = 1;
  optional string name = 2;
}