src/trace_processor/heap_profile_tracker_unittest.cc - platform/external/perfetto - Gitiles

 /*
  * 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.
  */

 #include "src/trace_processor/heap_profile_tracker.h"

 #include "src/trace_processor/trace_processor_context.h"

 #include <gmock/gmock.h>
 #include <gtest/gtest.h>

 namespace perfetto {
 namespace trace_processor {
 namespace {

 constexpr auto kFirstPacket = 0;
 constexpr auto kFirstPacketMappingNameId = 1;
 constexpr auto kFirstPacketBuildId = 2;
 constexpr auto kFirstPacketFrameNameId = 3;

 constexpr auto kFirstPacketMappingId = 1;
 constexpr auto kFirstPacketFrameId = 1;

 constexpr auto kSecondPacket = 1;
 constexpr auto kSecondPacketMappingNameId = 3;
 constexpr auto kSecondPacketBuildId = 2;
 constexpr auto kSecondPacketFrameNameId = 1;

 constexpr auto kSecondPacketFrameId = 2;
 constexpr auto kSecondPacketMappingId = 2;

 constexpr auto kMappingOffset = 123;
 constexpr auto kMappingStart = 234;
 constexpr auto kMappingEnd = 345;
 constexpr auto kMappingLoadBias = 456;

 static constexpr auto kFrameRelPc = 567;
 static constexpr char kBuildIDName[] = "[build id]";
 static constexpr char kBuildIDHexName[] = "5b6275696c642069645d";

 using ::testing::ElementsAre;

 class HeapProfileTrackerDupTest : public ::testing::Test {
  public:
   HeapProfileTrackerDupTest() {
     context.storage.reset(new TraceStorage());
     context.heap_profile_tracker.reset(new HeapProfileTracker(&context));

     mapping_name = context.storage->InternString("[mapping]");
     build = context.storage->InternString(kBuildIDName);
     frame_name = context.storage->InternString("[frame]");
   }

  protected:
   void InsertMapping() {
     context.heap_profile_tracker->AddString(
         kFirstPacket, kFirstPacketMappingNameId, mapping_name);
     context.heap_profile_tracker->AddString(
         kSecondPacket, kSecondPacketMappingNameId, mapping_name);

     context.heap_profile_tracker->AddString(kFirstPacket, kFirstPacketBuildId,
                                             build);
     context.heap_profile_tracker->AddString(kSecondPacket, kSecondPacketBuildId,
                                             build);

     HeapProfileTracker::SourceMapping first_frame;
     first_frame.build_id = kFirstPacketBuildId;
     first_frame.offset = kMappingOffset;
     first_frame.start = kMappingStart;
     first_frame.end = kMappingEnd;
     first_frame.load_bias = kMappingLoadBias;
     first_frame.name_id = kFirstPacketMappingNameId;

     HeapProfileTracker::SourceMapping second_frame;
     second_frame.build_id = kSecondPacketBuildId;
     second_frame.offset = kMappingOffset;
     second_frame.start = kMappingStart;
     second_frame.end = kMappingEnd;
     second_frame.load_bias = kMappingLoadBias;
     second_frame.name_id = kSecondPacketMappingNameId;

     context.heap_profile_tracker->AddMapping(
         kFirstPacket, kFirstPacketMappingId, first_frame);
     context.heap_profile_tracker->AddMapping(
         kSecondPacket, kSecondPacketMappingId, second_frame);
   }

   void InsertFrame() {
     InsertMapping();
     context.heap_profile_tracker->AddString(
         kFirstPacket, kFirstPacketFrameNameId, frame_name);
     context.heap_profile_tracker->AddString(
         kSecondPacket, kSecondPacketFrameNameId, frame_name);

     HeapProfileTracker::SourceFrame first_frame;
     first_frame.name_id = kFirstPacketFrameNameId;
     first_frame.mapping_id = kFirstPacketMappingId;
     first_frame.rel_pc = kFrameRelPc;

     HeapProfileTracker::SourceFrame second_frame;
     second_frame.name_id = kSecondPacketFrameNameId;
     second_frame.mapping_id = kSecondPacketMappingId;
     second_frame.rel_pc = kFrameRelPc;

     context.heap_profile_tracker->AddFrame(kFirstPacket, kFirstPacketFrameId,
                                            first_frame);
     context.heap_profile_tracker->AddFrame(kSecondPacket, kSecondPacketFrameId,
                                            second_frame);
   }

   void InsertCallsite() {
     InsertFrame();

     HeapProfileTracker::SourceCallstack first_callsite = {kFirstPacketFrameId,
                                                           kFirstPacketFrameId};
     HeapProfileTracker::SourceCallstack second_callsite = {
         kSecondPacketFrameId, kSecondPacketFrameId};

     context.heap_profile_tracker->AddCallstack(kFirstPacket, 0, first_callsite);
     context.heap_profile_tracker->AddCallstack(kSecondPacket, 0,
                                                second_callsite);
   }

   StringId mapping_name;
   StringId build;
   StringId frame_name;
   TraceProcessorContext context;
 };

 // Insert the same mapping from two different packets, with different strings
 // interned, and assert we only store one.
 TEST_F(HeapProfileTrackerDupTest, Mapping) {
   InsertMapping();

   EXPECT_THAT(context.storage->heap_profile_mappings().build_ids(),
               ElementsAre(context.storage->InternString({kBuildIDHexName})));
   EXPECT_THAT(context.storage->heap_profile_mappings().offsets(),
               ElementsAre(kMappingOffset));
   EXPECT_THAT(context.storage->heap_profile_mappings().starts(),
               ElementsAre(kMappingStart));
   EXPECT_THAT(context.storage->heap_profile_mappings().ends(),
               ElementsAre(kMappingEnd));
   EXPECT_THAT(context.storage->heap_profile_mappings().load_biases(),
               ElementsAre(kMappingLoadBias));
   EXPECT_THAT(context.storage->heap_profile_mappings().names(),
               ElementsAre(mapping_name));
 }

 // Insert the same mapping from two different packets, with different strings
 // interned, and assert we only store one.
 TEST_F(HeapProfileTrackerDupTest, Frame) {
   InsertFrame();

   EXPECT_THAT(context.storage->heap_profile_frames().names(),
               ElementsAre(frame_name));
   EXPECT_THAT(context.storage->heap_profile_frames().mappings(),
               ElementsAre(0));
   EXPECT_THAT(context.storage->heap_profile_frames().rel_pcs(),
               ElementsAre(kFrameRelPc));
 }

 // Insert the same callstack from two different packets, assert it is only
 // stored once.
 TEST_F(HeapProfileTrackerDupTest, Callstack) {
   InsertCallsite();

   EXPECT_THAT(context.storage->heap_profile_callsites().frame_depths(),
               ElementsAre(0, 1));
   EXPECT_THAT(context.storage->heap_profile_callsites().parent_callsite_ids(),
               ElementsAre(-1, 0));
   EXPECT_THAT(context.storage->heap_profile_callsites().frame_ids(),
               ElementsAre(0, 0));
 }

 int64_t FindCallstack(const TraceStorage& storage,
                       int64_t depth,
                       int64_t parent,
                       int64_t frame_id) {
   const auto& callsites = storage.heap_profile_callsites();
   for (size_t i = 0; i < callsites.frame_depths().size(); ++i) {
     if (callsites.frame_depths()[i] == depth &&
         callsites.parent_callsite_ids()[i] == parent &&
         callsites.frame_ids()[i] == frame_id) {
       return static_cast<int64_t>(i);
     }
   }
   return -1;
 }

 // Insert multiple mappings, frames and callstacks and check result.
 TEST(HeapProfileTrackerTest, Functional) {
   TraceProcessorContext context;
   context.storage.reset(new TraceStorage());
   context.heap_profile_tracker.reset(new HeapProfileTracker(&context));

   HeapProfileTracker* hpt = context.heap_profile_tracker.get();

   constexpr auto kPacket = 0;
   uint64_t next_string_intern_id = 1;

   const std::string build_ids[] = {"build1", "build2", "build3"};
   uint64_t build_id_ids[base::ArraySize(build_ids)];
   for (size_t i = 0; i < base::ArraySize(build_ids); ++i)
     build_id_ids[i] = next_string_intern_id++;

   const std::string mapping_names[] = {"map1", "map2", "map3"};
   uint64_t mapping_name_ids[base::ArraySize(mapping_names)];
   for (size_t i = 0; i < base::ArraySize(mapping_names); ++i)
     mapping_name_ids[i] = next_string_intern_id++;

   HeapProfileTracker::SourceMapping mappings[base::ArraySize(mapping_names)] =
       {};
   mappings[0].build_id = build_id_ids[0];
   mappings[0].offset = 1;
   mappings[0].start = 2;
   mappings[0].end = 3;
   mappings[0].load_bias = 0;
   mappings[0].name_id = mapping_name_ids[0];

   mappings[1].build_id = build_id_ids[1];
   mappings[1].offset = 1;
   mappings[1].start = 2;
   mappings[1].end = 3;
   mappings[1].load_bias = 1;
   mappings[1].name_id = mapping_name_ids[1];

   mappings[2].build_id = build_id_ids[2];
   mappings[2].offset = 1;
   mappings[2].start = 2;
   mappings[2].end = 3;
   mappings[2].load_bias = 2;
   mappings[2].name_id = mapping_name_ids[2];

   const std::string function_names[] = {"fun1", "fun2", "fun3", "fun4"};
   uint64_t function_name_ids[base::ArraySize(function_names)];
   for (size_t i = 0; i < base::ArraySize(function_names); ++i)
     function_name_ids[i] = next_string_intern_id++;

   HeapProfileTracker::SourceFrame frames[base::ArraySize(function_names)];
   frames[0].name_id = function_name_ids[0];
   frames[0].mapping_id = 0;
   frames[0].rel_pc = 123;

   frames[1].name_id = function_name_ids[1];
   frames[1].mapping_id = 0;
   frames[1].rel_pc = 123;

   frames[2].name_id = function_name_ids[2];
   frames[2].mapping_id = 1;
   frames[2].rel_pc = 123;

   frames[3].name_id = function_name_ids[3];
   frames[3].mapping_id = 2;
   frames[3].rel_pc = 123;

   HeapProfileTracker::SourceCallstack callstacks[3];
   callstacks[0] = {2, 1, 0};
   callstacks[1] = {2, 1, 0, 1, 0};
   callstacks[2] = {0, 2, 0, 1, 2};

   for (size_t i = 0; i < base::ArraySize(build_ids); ++i) {
     auto interned = context.storage->InternString(
         {build_ids[i].data(), build_ids[i].size()});
     hpt->AddString(kPacket, build_id_ids[i], interned);
   }
   for (size_t i = 0; i < base::ArraySize(mapping_names); ++i) {
     auto interned = context.storage->InternString(
         {mapping_names[i].data(), mapping_names[i].size()});
     hpt->AddString(kPacket, mapping_name_ids[i], interned);
   }
   for (size_t i = 0; i < base::ArraySize(function_names); ++i) {
     auto interned = context.storage->InternString(
         {function_names[i].data(), function_names[i].size()});
     hpt->AddString(kPacket, function_name_ids[i], interned);
   }

   for (size_t i = 0; i < base::ArraySize(mappings); ++i)
     hpt->AddMapping(kPacket, i, mappings[i]);
   for (size_t i = 0; i < base::ArraySize(frames); ++i)
     hpt->AddFrame(kPacket, i, frames[i]);
   for (size_t i = 0; i < base::ArraySize(callstacks); ++i)
     hpt->AddCallstack(kPacket, i, callstacks[i]);

   for (size_t i = 0; i < base::ArraySize(callstacks); ++i) {
     int64_t parent = -1;
     const HeapProfileTracker::SourceCallstack& callstack = callstacks[i];
     for (size_t depth = 0; depth < callstack.size(); ++depth) {
       auto frame_id =
           hpt->GetDatabaseFrameIdForTesting(kPacket, callstack[depth]);
       ASSERT_NE(frame_id, -1);
       int64_t self = FindCallstack(
           *context.storage, static_cast<int64_t>(depth), parent, frame_id);
       ASSERT_NE(self, -1);
       parent = self;
     }
   }
 }

 }  // namespace
 }  // namespace trace_processor
 }  // namespace perfetto
	/*
	* 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.
	*/

	#include "src/trace_processor/heap_profile_tracker.h"

	#include "src/trace_processor/trace_processor_context.h"

	#include <gmock/gmock.h>
	#include <gtest/gtest.h>

	namespace perfetto {
	namespace trace_processor {
	namespace {

	constexpr auto kFirstPacket = 0;
	constexpr auto kFirstPacketMappingNameId = 1;
	constexpr auto kFirstPacketBuildId = 2;
	constexpr auto kFirstPacketFrameNameId = 3;

	constexpr auto kFirstPacketMappingId = 1;
	constexpr auto kFirstPacketFrameId = 1;

	constexpr auto kSecondPacket = 1;
	constexpr auto kSecondPacketMappingNameId = 3;
	constexpr auto kSecondPacketBuildId = 2;
	constexpr auto kSecondPacketFrameNameId = 1;

	constexpr auto kSecondPacketFrameId = 2;
	constexpr auto kSecondPacketMappingId = 2;

	constexpr auto kMappingOffset = 123;
	constexpr auto kMappingStart = 234;
	constexpr auto kMappingEnd = 345;
	constexpr auto kMappingLoadBias = 456;

	static constexpr auto kFrameRelPc = 567;
	static constexpr char kBuildIDName[] = "[build id]";
	static constexpr char kBuildIDHexName[] = "5b6275696c642069645d";

	using ::testing::ElementsAre;

	class HeapProfileTrackerDupTest : public ::testing::Test {
	public:
	HeapProfileTrackerDupTest() {
	context.storage.reset(new TraceStorage());
	context.heap_profile_tracker.reset(new HeapProfileTracker(&context));

	mapping_name = context.storage->InternString("[mapping]");
	build = context.storage->InternString(kBuildIDName);
	frame_name = context.storage->InternString("[frame]");
	}

	protected:
	void InsertMapping() {
	context.heap_profile_tracker->AddString(
	kFirstPacket, kFirstPacketMappingNameId, mapping_name);
	context.heap_profile_tracker->AddString(
	kSecondPacket, kSecondPacketMappingNameId, mapping_name);

	context.heap_profile_tracker->AddString(kFirstPacket, kFirstPacketBuildId,
	build);
	context.heap_profile_tracker->AddString(kSecondPacket, kSecondPacketBuildId,
	build);

	HeapProfileTracker::SourceMapping first_frame;
	first_frame.build_id = kFirstPacketBuildId;
	first_frame.offset = kMappingOffset;
	first_frame.start = kMappingStart;
	first_frame.end = kMappingEnd;
	first_frame.load_bias = kMappingLoadBias;
	first_frame.name_id = kFirstPacketMappingNameId;

	HeapProfileTracker::SourceMapping second_frame;
	second_frame.build_id = kSecondPacketBuildId;
	second_frame.offset = kMappingOffset;
	second_frame.start = kMappingStart;
	second_frame.end = kMappingEnd;
	second_frame.load_bias = kMappingLoadBias;
	second_frame.name_id = kSecondPacketMappingNameId;

	context.heap_profile_tracker->AddMapping(
	kFirstPacket, kFirstPacketMappingId, first_frame);
	context.heap_profile_tracker->AddMapping(
	kSecondPacket, kSecondPacketMappingId, second_frame);
	}

	void InsertFrame() {
	InsertMapping();
	context.heap_profile_tracker->AddString(
	kFirstPacket, kFirstPacketFrameNameId, frame_name);
	context.heap_profile_tracker->AddString(
	kSecondPacket, kSecondPacketFrameNameId, frame_name);

	HeapProfileTracker::SourceFrame first_frame;
	first_frame.name_id = kFirstPacketFrameNameId;
	first_frame.mapping_id = kFirstPacketMappingId;
	first_frame.rel_pc = kFrameRelPc;

	HeapProfileTracker::SourceFrame second_frame;
	second_frame.name_id = kSecondPacketFrameNameId;
	second_frame.mapping_id = kSecondPacketMappingId;
	second_frame.rel_pc = kFrameRelPc;

	context.heap_profile_tracker->AddFrame(kFirstPacket, kFirstPacketFrameId,
	first_frame);
	context.heap_profile_tracker->AddFrame(kSecondPacket, kSecondPacketFrameId,
	second_frame);
	}

	void InsertCallsite() {
	InsertFrame();

	HeapProfileTracker::SourceCallstack first_callsite = {kFirstPacketFrameId,
	kFirstPacketFrameId};
	HeapProfileTracker::SourceCallstack second_callsite = {
	kSecondPacketFrameId, kSecondPacketFrameId};

	context.heap_profile_tracker->AddCallstack(kFirstPacket, 0, first_callsite);
	context.heap_profile_tracker->AddCallstack(kSecondPacket, 0,
	second_callsite);
	}

	StringId mapping_name;
	StringId build;
	StringId frame_name;
	TraceProcessorContext context;
	};

	// Insert the same mapping from two different packets, with different strings
	// interned, and assert we only store one.
	TEST_F(HeapProfileTrackerDupTest, Mapping) {
	InsertMapping();

	EXPECT_THAT(context.storage->heap_profile_mappings().build_ids(),
	ElementsAre(context.storage->InternString({kBuildIDHexName})));
	EXPECT_THAT(context.storage->heap_profile_mappings().offsets(),
	ElementsAre(kMappingOffset));
	EXPECT_THAT(context.storage->heap_profile_mappings().starts(),
	ElementsAre(kMappingStart));
	EXPECT_THAT(context.storage->heap_profile_mappings().ends(),
	ElementsAre(kMappingEnd));
	EXPECT_THAT(context.storage->heap_profile_mappings().load_biases(),
	ElementsAre(kMappingLoadBias));
	EXPECT_THAT(context.storage->heap_profile_mappings().names(),
	ElementsAre(mapping_name));
	}

	// Insert the same mapping from two different packets, with different strings
	// interned, and assert we only store one.
	TEST_F(HeapProfileTrackerDupTest, Frame) {
	InsertFrame();

	EXPECT_THAT(context.storage->heap_profile_frames().names(),
	ElementsAre(frame_name));
	EXPECT_THAT(context.storage->heap_profile_frames().mappings(),
	ElementsAre(0));
	EXPECT_THAT(context.storage->heap_profile_frames().rel_pcs(),
	ElementsAre(kFrameRelPc));
	}

	// Insert the same callstack from two different packets, assert it is only
	// stored once.
	TEST_F(HeapProfileTrackerDupTest, Callstack) {
	InsertCallsite();

	EXPECT_THAT(context.storage->heap_profile_callsites().frame_depths(),
	ElementsAre(0, 1));
	EXPECT_THAT(context.storage->heap_profile_callsites().parent_callsite_ids(),
	ElementsAre(-1, 0));
	EXPECT_THAT(context.storage->heap_profile_callsites().frame_ids(),
	ElementsAre(0, 0));
	}

	int64_t FindCallstack(const TraceStorage& storage,
	int64_t depth,
	int64_t parent,
	int64_t frame_id) {
	const auto& callsites = storage.heap_profile_callsites();
	for (size_t i = 0; i < callsites.frame_depths().size(); ++i) {
	if (callsites.frame_depths()[i] == depth &&
	callsites.parent_callsite_ids()[i] == parent &&
	callsites.frame_ids()[i] == frame_id) {
	return static_cast<int64_t>(i);
	}
	}
	return -1;
	}

	// Insert multiple mappings, frames and callstacks and check result.
	TEST(HeapProfileTrackerTest, Functional) {
	TraceProcessorContext context;
	context.storage.reset(new TraceStorage());
	context.heap_profile_tracker.reset(new HeapProfileTracker(&context));

	HeapProfileTracker* hpt = context.heap_profile_tracker.get();

	constexpr auto kPacket = 0;
	uint64_t next_string_intern_id = 1;

	const std::string build_ids[] = {"build1", "build2", "build3"};
	uint64_t build_id_ids[base::ArraySize(build_ids)];
	for (size_t i = 0; i < base::ArraySize(build_ids); ++i)
	build_id_ids[i] = next_string_intern_id++;

	const std::string mapping_names[] = {"map1", "map2", "map3"};
	uint64_t mapping_name_ids[base::ArraySize(mapping_names)];
	for (size_t i = 0; i < base::ArraySize(mapping_names); ++i)
	mapping_name_ids[i] = next_string_intern_id++;

	HeapProfileTracker::SourceMapping mappings[base::ArraySize(mapping_names)] =
	{};
	mappings[0].build_id = build_id_ids[0];
	mappings[0].offset = 1;
	mappings[0].start = 2;
	mappings[0].end = 3;
	mappings[0].load_bias = 0;
	mappings[0].name_id = mapping_name_ids[0];

	mappings[1].build_id = build_id_ids[1];
	mappings[1].offset = 1;
	mappings[1].start = 2;
	mappings[1].end = 3;
	mappings[1].load_bias = 1;
	mappings[1].name_id = mapping_name_ids[1];

	mappings[2].build_id = build_id_ids[2];
	mappings[2].offset = 1;
	mappings[2].start = 2;
	mappings[2].end = 3;
	mappings[2].load_bias = 2;
	mappings[2].name_id = mapping_name_ids[2];

	const std::string function_names[] = {"fun1", "fun2", "fun3", "fun4"};
	uint64_t function_name_ids[base::ArraySize(function_names)];
	for (size_t i = 0; i < base::ArraySize(function_names); ++i)
	function_name_ids[i] = next_string_intern_id++;

	HeapProfileTracker::SourceFrame frames[base::ArraySize(function_names)];
	frames[0].name_id = function_name_ids[0];
	frames[0].mapping_id = 0;
	frames[0].rel_pc = 123;

	frames[1].name_id = function_name_ids[1];
	frames[1].mapping_id = 0;
	frames[1].rel_pc = 123;

	frames[2].name_id = function_name_ids[2];
	frames[2].mapping_id = 1;
	frames[2].rel_pc = 123;

	frames[3].name_id = function_name_ids[3];
	frames[3].mapping_id = 2;
	frames[3].rel_pc = 123;

	HeapProfileTracker::SourceCallstack callstacks[3];
	callstacks[0] = {2, 1, 0};
	callstacks[1] = {2, 1, 0, 1, 0};
	callstacks[2] = {0, 2, 0, 1, 2};

	for (size_t i = 0; i < base::ArraySize(build_ids); ++i) {
	auto interned = context.storage->InternString(
	{build_ids[i].data(), build_ids[i].size()});
	hpt->AddString(kPacket, build_id_ids[i], interned);
	}
	for (size_t i = 0; i < base::ArraySize(mapping_names); ++i) {
	auto interned = context.storage->InternString(
	{mapping_names[i].data(), mapping_names[i].size()});
	hpt->AddString(kPacket, mapping_name_ids[i], interned);
	}
	for (size_t i = 0; i < base::ArraySize(function_names); ++i) {
	auto interned = context.storage->InternString(
	{function_names[i].data(), function_names[i].size()});
	hpt->AddString(kPacket, function_name_ids[i], interned);
	}

	for (size_t i = 0; i < base::ArraySize(mappings); ++i)
	hpt->AddMapping(kPacket, i, mappings[i]);
	for (size_t i = 0; i < base::ArraySize(frames); ++i)
	hpt->AddFrame(kPacket, i, frames[i]);
	for (size_t i = 0; i < base::ArraySize(callstacks); ++i)
	hpt->AddCallstack(kPacket, i, callstacks[i]);

	for (size_t i = 0; i < base::ArraySize(callstacks); ++i) {
	int64_t parent = -1;
	const HeapProfileTracker::SourceCallstack& callstack = callstacks[i];
	for (size_t depth = 0; depth < callstack.size(); ++depth) {
	auto frame_id =
	hpt->GetDatabaseFrameIdForTesting(kPacket, callstack[depth]);
	ASSERT_NE(frame_id, -1);
	int64_t self = FindCallstack(
	*context.storage, static_cast<int64_t>(depth), parent, frame_id);
	ASSERT_NE(self, -1);
	parent = self;
	}
	}
	}

	} // namespace
	} // namespace trace_processor
	} // namespace perfetto