/*
 * Copyright (C) 2023 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";

package perfetto.protos;

// Representation of a stack. To be used as input to generate flame charts
// or pprof.
message Stack {
  // A stack is an ordered list of these entries. Think of them as frames in the
  // stack, although we support entire call stacks as an entry (for efficiency,
  // no need to copy entire stacks around if we can just copy a callsite_id).
  message Entry {
    oneof entry {
      string name = 1;
      uint32 callsite_id = 2;
      uint32 annotated_callsite_id = 3;
      uint32 frame_id = 4;
    }
  }
  // Ordered list of "frames" in the stack. Leaf is at index 0.
  // Note that we call these entries and not frames because an entire call stack
  // can be referenced in one entry (via callsite_id).
  repeated Entry entries = 1;
}