// 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.

syntax = "proto2";

option optimize_for = LITE_RUNTIME;

package browser_watcher;

// The state of the system on which Chrome is running (shutting down, battery
// level, load, etc.).
message SystemState {
  // TODO(manzagop): flesh out.
}

message CodeModule {
  // The base address of this code module as it was loaded by the process.
  optional int64 base_address = 1;

  // The size of the code module.
  optional int64 size = 2;

  // The path or file name that the code module was loaded from.
  optional string code_file = 3;

  // An identifying string used to discriminate between multiple versions and
  // builds of the same code module.  This may contain a uuid, timestamp,
  // version number, or any combination of this or other information, in an
  // implementation-defined format.
  optional string code_identifier = 4;

  // The filename containing debugging information associated with the code
  // module.  If debugging information is stored in a file separate from the
  // code module itself (as is the case when .pdb or .dSYM files are used),
  // this will be different from code_file.  If debugging information is
  // stored in the code module itself (possibly prior to stripping), this
  // will be the same as code_file.
  optional string debug_file = 5;

  // An identifying string similar to code_identifier, but identifies a
  // specific version and build of the associated debug file.  This may be
  // the same as code_identifier when the debug_file and code_file are
  // identical or when the same identifier is used to identify distinct
  // debug and code files.
  optional string debug_identifier = 6;

  // A human-readable representation of the code module's version.
  optional string version = 7;
}

// An activity represents information about something of interest on a thread.
// Next id: 9
message Activity {
  enum Type {
    NONE = 0;
    ACT_TASK_RUN = 1;
    ACT_LOCK_ACQUIRE = 2;
    ACT_EVENT_WAIT = 3;
    ACT_THREAD_JOIN = 4;
    ACT_PROCESS_WAIT = 5;
  }

  // Identifies the type of the activity (and specifies which fields are
  // relevant).
  optional Type type = 1;

  // Creation time of the activity.
  optional int64 time = 2;

  // The address that is the origin of the activity.
  // Expected for ACT_TASK_*
  optional uint64 origin_address = 3;

  // The sequence identifier of the posted task.
  // Expected for ACT_TASK_*
  optional uint64 task_sequence_id = 4;

  // The memory address of the lock object.
  optional uint64 lock_address = 5;

  // The memory address of the event object.
  optional uint64 event_address = 6;

  // A unique identifier for a thread within a process.
  optional int64 thread_id = 7;

  // A unique identifier for a process.
  optional int64 process_id = 8;
}

// The state of a thread.
// Next id: 5
message ThreadState {
  // The name of the thread, up to a maxiumum length.
  optional string thread_name = 1;

  // The identifier of the thread.
  optional int64 thread_id = 2;

  // The activity stack. |activity_count| specifies the number of activities on
  // stack and |activities| holds the base of the stack (up to a maximum size).
  optional int32 activity_count = 3;
  repeated Activity activities = 4;
}

// The state of a process.
// Next id: 4
message ProcessState {
  // The identifier of the process.
  optional int64 process_id = 3;

  // Note: likely only a subset of modules of interest (e.g. Chromium's own
  // modules).
  repeated CodeModule modules = 1;
  repeated ThreadState threads = 2;
  // TODO(manzagop): add experiment state.
}

// A stability report contains information pertaining to the execution of a
// single logical instance of a "chrome browser". It is comprised of information
// about the system state and about the chrome browser's processes.
message StabilityReport {
  optional SystemState system_state = 1;
  // TODO(manzagop): revisit whether a single repeated field should contain all
  //     processes, or whether it's preferable to have separate fields per type.
  // TODO(manzagop): add information about the type of process, pid, process
  //     times (e.g. start time), hierarchical relationships (e.g. parent pid),
  //     command line, etc.
  repeated ProcessState process_states = 2;
}