src/traced/probes/ftrace/proto_translation_table_unittest.cc - third_party/perfetto - Git at Google

 /*
  * Copyright (C) 2017 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/traced/probes/ftrace/proto_translation_table.h"

 #include "gmock/gmock.h"
 #include "gtest/gtest.h"
 #include "src/traced/probes/ftrace/event_info.h"
 #include "src/traced/probes/ftrace/ftrace_procfs.h"

 using testing::_;
 using testing::Values;
 using testing::ValuesIn;
 using testing::TestWithParam;
 using testing::Return;
 using testing::AnyNumber;
 using testing::IsNull;
 using testing::Contains;
 using testing::Eq;
 using testing::Pointee;

 namespace perfetto {
 namespace {

 class MockFtraceProcfs : public FtraceProcfs {
  public:
   MockFtraceProcfs() : FtraceProcfs("/root/") {}

   MOCK_CONST_METHOD0(ReadPageHeaderFormat, std::string());
   MOCK_CONST_METHOD2(ReadEventFormat,
                      std::string(const std::string& group,
                                  const std::string& name));
 };

 class AllTranslationTableTest : public TestWithParam<const char*> {
  public:
   void SetUp() override {
     std::string path =
         "src/traced/probes/ftrace/test/data/" + std::string(GetParam()) + "/";
     FtraceProcfs ftrace_procfs(path);
     table_ = ProtoTranslationTable::Create(&ftrace_procfs, GetStaticEventInfo(),
                                            GetStaticCommonFieldsInfo());
     PERFETTO_CHECK(table_);
   }

   std::unique_ptr<ProtoTranslationTable> table_;
 };

 class TranslationTableCreationTest : public TestWithParam<uint16_t> {};

 const char* kDevices[] = {
     "android_seed_N2F62_3.10.49", "android_hammerhead_MRA59G_3.4.0",
 };

 TEST_P(AllTranslationTableTest, Create) {
   EXPECT_TRUE(table_);
   EXPECT_TRUE(table_->GetEventByName("print"));
   EXPECT_TRUE(table_->GetEventByName("sched_switch"));
   EXPECT_TRUE(table_->GetEventByName("sched_wakeup"));
   EXPECT_TRUE(table_->GetEventByName("ext4_da_write_begin"));
   for (const Event& event : table_->events()) {
     if (!event.ftrace_event_id)
       continue;
     EXPECT_TRUE(event.name);
     EXPECT_TRUE(event.group);
     EXPECT_TRUE(event.proto_field_id);
     for (const Field& field : event.fields) {
       EXPECT_TRUE(field.proto_field_id);
       EXPECT_TRUE(field.ftrace_type);
       EXPECT_TRUE(field.proto_field_type);
     }
   }
   ASSERT_EQ(table_->common_fields().size(), 1u);
   const Field& pid_field = table_->common_fields().at(0);
   EXPECT_EQ(std::string(pid_field.ftrace_name), "common_pid");
   EXPECT_EQ(pid_field.proto_field_id, 2u);

   {
     auto event = table_->GetEventByName("print");
     EXPECT_TRUE(event);
     EXPECT_EQ(std::string(event->name), "print");
     EXPECT_EQ(std::string(event->group), "ftrace");
     EXPECT_EQ(event->fields.at(1).proto_field_type, kProtoString);
     EXPECT_EQ(event->fields.at(1).ftrace_type, kFtraceCString);
     EXPECT_EQ(event->fields.at(1).strategy, kCStringToString);
   }
 }

 INSTANTIATE_TEST_CASE_P(ByDevice, AllTranslationTableTest, ValuesIn(kDevices));

 TEST(TranslationTableTest, Seed) {
   std::string path =
       "src/traced/probes/ftrace/test/data/android_seed_N2F62_3.10.49/";
   FtraceProcfs ftrace_procfs(path);
   auto table = ProtoTranslationTable::Create(
       &ftrace_procfs, GetStaticEventInfo(), GetStaticCommonFieldsInfo());
   const Field& pid_field = table->common_fields().at(0);
   EXPECT_EQ(std::string(pid_field.ftrace_name), "common_pid");
   EXPECT_EQ(pid_field.proto_field_id, 2u);
   EXPECT_EQ(pid_field.ftrace_offset, 4u);
   EXPECT_EQ(pid_field.ftrace_size, 4u);

   {
     auto event = table->GetEventByName("sched_switch");
     EXPECT_EQ(std::string(event->name), "sched_switch");
     EXPECT_EQ(std::string(event->group), "sched");
     EXPECT_EQ(event->ftrace_event_id, 68ul);
     EXPECT_EQ(event->fields.at(0).ftrace_offset, 8u);
     EXPECT_EQ(event->fields.at(0).ftrace_size, 16u);
   }

   {
     auto event = table->GetEventByName("sched_wakeup");
     EXPECT_EQ(std::string(event->name), "sched_wakeup");
     EXPECT_EQ(std::string(event->group), "sched");
     EXPECT_EQ(event->ftrace_event_id, 70ul);
     EXPECT_EQ(event->fields.at(0).ftrace_offset, 8u);
     EXPECT_EQ(event->fields.at(0).ftrace_size, 16u);
   }

   {
     auto event = table->GetEventByName("cpufreq_interactive_target");
     EXPECT_EQ(std::string(event->name), "cpufreq_interactive_target");
     EXPECT_EQ(std::string(event->group), "cpufreq_interactive");
     EXPECT_EQ(event->ftrace_event_id, 509ul);
     EXPECT_EQ(event->fields.at(0).ftrace_offset, 8u);
     EXPECT_EQ(event->fields.at(0).ftrace_size, 4u);
   }

   {
     auto event = table->GetEventByName("ext4_da_write_begin");
     EXPECT_EQ(std::string(event->name), "ext4_da_write_begin");
     EXPECT_EQ(std::string(event->group), "ext4");
     EXPECT_EQ(event->ftrace_event_id, 303ul);
     EXPECT_EQ(event->fields.at(0).ftrace_offset, 8u);
     EXPECT_EQ(event->fields.at(0).ftrace_size, 4u);
   }
 }

 TEST_P(TranslationTableCreationTest, Create) {
   MockFtraceProcfs ftrace;
   std::vector<Field> common_fields;
   std::vector<Event> events;

   ON_CALL(ftrace, ReadPageHeaderFormat())
       .WillByDefault(Return(
           R"(	field: u64 timestamp;	offset:0;	size:8;	signed:0;
 	field: local_t commit;	offset:8;	size:)" +
           std::to_string(GetParam()) + R"(;	signed:1;
 	field: int overwrite;	offset:8;	size:1;	signed:1;
 	field: char data;	offset:16;	size:4080;	signed:0;)"));
   ON_CALL(ftrace, ReadEventFormat(_, _)).WillByDefault(Return(""));
   ON_CALL(ftrace, ReadEventFormat("group", "foo"))
       .WillByDefault(Return(R"(name: foo
 ID: 42
 format:
 	field:unsigned short common_type;	offset:0;	size:2;	signed:0;
 	field:int common_pid;	offset:4;	size:4;	signed:1;

 	field:char field_a[16];	offset:8;	size:16;	signed:0;
 	field:int field_b;	offset:24;	size:4;	signed:1;
 	field:int field_d;	offset:28;	size:4;	signed:1;
 	field:u32 field_e;	offset:32;	size:4;	signed:0;

 print fmt: "some format")"));
   ;

   EXPECT_CALL(ftrace, ReadEventFormat(_, _)).Times(AnyNumber());

   {
     events.emplace_back(Event{});
     Event* event = &events.back();
     event->name = "foo";
     event->group = "group";
     event->proto_field_id = 21;

     {
       // We should get this field.
       event->fields.emplace_back(Field{});
       Field* field = &event->fields.back();
       field->proto_field_id = 501;
       field->proto_field_type = kProtoString;
       field->ftrace_name = "field_a";
     }

     {
       // We shouldn't get this field: don't know how to read int -> string.
       event->fields.emplace_back(Field{});
       Field* field = &event->fields.back();
       field->proto_field_id = 502;
       field->proto_field_type = kProtoString;
       field->ftrace_name = "field_b";
     }

     {
       // We shouldn't get this field: no matching field in the format file.
       event->fields.emplace_back(Field{});
       Field* field = &event->fields.back();
       field->proto_field_id = 503;
       field->proto_field_type = kProtoString;
       field->ftrace_name = "field_c";
     }

     {
       // We should get this field.
       event->fields.emplace_back(Field{});
       Field* field = &event->fields.back();
       field->proto_field_id = 504;
       field->proto_field_type = kProtoUint64;
       field->ftrace_name = "field_e";
     }
   }

   {
     events.emplace_back(Event{});
     Event* event = &events.back();
     event->name = "bar";
     event->group = "group";
     event->proto_field_id = 22;
   }

   auto table = ProtoTranslationTable::Create(&ftrace, std::move(events),
                                              std::move(common_fields));
   EXPECT_EQ(table->largest_id(), 42ul);
   EXPECT_EQ(table->EventNameToFtraceId("foo"), 42ul);
   EXPECT_EQ(table->EventNameToFtraceId("bar"), 0ul);
   EXPECT_EQ(table->EventNameToFtraceId("bar"), 0ul);
   EXPECT_FALSE(table->GetEventById(43ul));
   ASSERT_TRUE(table->GetEventById(42ul));
   EXPECT_EQ(table->ftrace_page_header_spec().timestamp.size, 8);
   EXPECT_EQ(table->ftrace_page_header_spec().size.size, GetParam());
   EXPECT_EQ(table->ftrace_page_header_spec().overwrite.size, 1);
   auto event = table->GetEventById(42);
   EXPECT_EQ(event->ftrace_event_id, 42ul);
   EXPECT_EQ(event->proto_field_id, 21ul);
   EXPECT_EQ(event->size, 36u);
   EXPECT_EQ(std::string(event->name), "foo");
   EXPECT_EQ(std::string(event->group), "group");

   ASSERT_EQ(event->fields.size(), 2ul);
   auto field_a = event->fields.at(0);
   EXPECT_EQ(field_a.proto_field_id, 501ul);
   EXPECT_EQ(field_a.strategy, kFixedCStringToString);

   auto field_e = event->fields.at(1);
   EXPECT_EQ(field_e.proto_field_id, 504ul);
   EXPECT_EQ(field_e.strategy, kUint32ToUint64);
 }

 INSTANTIATE_TEST_CASE_P(BySize, TranslationTableCreationTest, Values(4, 8));

 TEST(TranslationTableTest, InferFtraceType) {
   FtraceFieldType type;

   ASSERT_TRUE(InferFtraceType("char foo[16]", 16, false, &type));
   EXPECT_EQ(type, kFtraceFixedCString);

   ASSERT_TRUE(InferFtraceType("char[] foo", 8, false, &type));
   EXPECT_EQ(type, kFtraceStringPtr);

   ASSERT_TRUE(InferFtraceType("char * foo", 8, false, &type));
   EXPECT_EQ(type, kFtraceStringPtr);

   ASSERT_TRUE(InferFtraceType("char foo[64]", 64, false, &type));
   EXPECT_EQ(type, kFtraceFixedCString);

   ASSERT_TRUE(InferFtraceType("u32 foo", 4, false, &type));
   EXPECT_EQ(type, kFtraceUint32);

   ASSERT_TRUE(InferFtraceType("i_ino foo", 4, false, &type));
   ASSERT_EQ(type, kFtraceInode32);

   ASSERT_TRUE(InferFtraceType("i_ino foo", 8, false, &type));
   ASSERT_EQ(type, kFtraceInode64);

   ASSERT_TRUE(InferFtraceType("ino_t foo", 4, false, &type));
   ASSERT_EQ(type, kFtraceInode32);

   ASSERT_TRUE(InferFtraceType("ino_t foo", 8, false, &type));
   ASSERT_EQ(type, kFtraceInode64);

   ASSERT_TRUE(InferFtraceType("dev_t foo", 4, false, &type));
   ASSERT_EQ(type, kFtraceDevId32);

   ASSERT_TRUE(InferFtraceType("dev_t foo", 8, false, &type));
   ASSERT_EQ(type, kFtraceDevId64);

   ASSERT_TRUE(InferFtraceType("pid_t foo", 4, false, &type));
   ASSERT_EQ(type, kFtracePid32);

   ASSERT_TRUE(InferFtraceType("int common_pid", 4, false, &type));
   ASSERT_EQ(type, kFtraceCommonPid32);

   ASSERT_TRUE(InferFtraceType("char foo", 1, true, &type));
   ASSERT_EQ(type, kFtraceInt8);

   ASSERT_TRUE(InferFtraceType("__data_loc char[] foo", 4, false, &type));
   ASSERT_EQ(type, kFtraceDataLoc);
   ASSERT_FALSE(InferFtraceType("__data_loc char[] foo", 8, false, &type));

   EXPECT_FALSE(InferFtraceType("foo", 64, false, &type));
 }

 TEST(TranslationTableTest, Getters) {
   std::vector<Field> common_fields;
   std::vector<Event> events;

   {
     Event event;
     event.name = "foo";
     event.group = "group_one";
     event.ftrace_event_id = 1;
     events.push_back(event);
   }

   {
     Event event;
     event.name = "bar";
     event.group = "group_one";
     event.ftrace_event_id = 2;
     events.push_back(event);
   }

   {
     Event event;
     event.name = "baz";
     event.group = "group_two";
     event.ftrace_event_id = 100;
     events.push_back(event);
   }

   ProtoTranslationTable table(
       events, std::move(common_fields),
       ProtoTranslationTable::DefaultPageHeaderSpecForTesting());
   EXPECT_EQ(table.largest_id(), 100ul);
   EXPECT_EQ(table.EventNameToFtraceId("foo"), 1ul);
   EXPECT_EQ(table.EventNameToFtraceId("baz"), 100ul);
   EXPECT_EQ(table.EventNameToFtraceId("no_such_event"), 0ul);
   EXPECT_EQ(table.GetEventById(1)->name, "foo");
   EXPECT_EQ(table.GetEventById(3), nullptr);
   EXPECT_EQ(table.GetEventById(200), nullptr);
   EXPECT_EQ(table.GetEventById(0), nullptr);
   EXPECT_EQ(table.GetEventByName("foo")->ftrace_event_id, 1u);
   EXPECT_THAT(*table.GetEventsByGroup("group_one"),
               Contains(testing::Field(&Event::name, "foo")));
   EXPECT_THAT(*table.GetEventsByGroup("group_one"),
               Contains(testing::Field(&Event::name, "bar")));
   EXPECT_THAT(*table.GetEventsByGroup("group_two"),
               Contains(testing::Field(&Event::name, "baz")));
   EXPECT_THAT(table.GetEventsByGroup("group_three"), IsNull());
 }

 }  // namespace
 }  // namespace perfetto
	/*
	* Copyright (C) 2017 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/traced/probes/ftrace/proto_translation_table.h"

	#include "gmock/gmock.h"
	#include "gtest/gtest.h"
	#include "src/traced/probes/ftrace/event_info.h"
	#include "src/traced/probes/ftrace/ftrace_procfs.h"

	using testing::_;
	using testing::Values;
	using testing::ValuesIn;
	using testing::TestWithParam;
	using testing::Return;
	using testing::AnyNumber;
	using testing::IsNull;
	using testing::Contains;
	using testing::Eq;
	using testing::Pointee;

	namespace perfetto {
	namespace {

	class MockFtraceProcfs : public FtraceProcfs {
	public:
	MockFtraceProcfs() : FtraceProcfs("/root/") {}

	MOCK_CONST_METHOD0(ReadPageHeaderFormat, std::string());
	MOCK_CONST_METHOD2(ReadEventFormat,
	std::string(const std::string& group,
	const std::string& name));
	};

	class AllTranslationTableTest : public TestWithParam<const char*> {
	public:
	void SetUp() override {
	std::string path =
	"src/traced/probes/ftrace/test/data/" + std::string(GetParam()) + "/";
	FtraceProcfs ftrace_procfs(path);
	table_ = ProtoTranslationTable::Create(&ftrace_procfs, GetStaticEventInfo(),
	GetStaticCommonFieldsInfo());
	PERFETTO_CHECK(table_);
	}

	std::unique_ptr<ProtoTranslationTable> table_;
	};

	class TranslationTableCreationTest : public TestWithParam<uint16_t> {};

	const char* kDevices[] = {
	"android_seed_N2F62_3.10.49", "android_hammerhead_MRA59G_3.4.0",
	};

	TEST_P(AllTranslationTableTest, Create) {
	EXPECT_TRUE(table_);
	EXPECT_TRUE(table_->GetEventByName("print"));
	EXPECT_TRUE(table_->GetEventByName("sched_switch"));
	EXPECT_TRUE(table_->GetEventByName("sched_wakeup"));
	EXPECT_TRUE(table_->GetEventByName("ext4_da_write_begin"));
	for (const Event& event : table_->events()) {
	if (!event.ftrace_event_id)
	continue;
	EXPECT_TRUE(event.name);
	EXPECT_TRUE(event.group);
	EXPECT_TRUE(event.proto_field_id);
	for (const Field& field : event.fields) {
	EXPECT_TRUE(field.proto_field_id);
	EXPECT_TRUE(field.ftrace_type);
	EXPECT_TRUE(field.proto_field_type);
	}
	}
	ASSERT_EQ(table_->common_fields().size(), 1u);
	const Field& pid_field = table_->common_fields().at(0);
	EXPECT_EQ(std::string(pid_field.ftrace_name), "common_pid");
	EXPECT_EQ(pid_field.proto_field_id, 2u);

	{
	auto event = table_->GetEventByName("print");
	EXPECT_TRUE(event);
	EXPECT_EQ(std::string(event->name), "print");
	EXPECT_EQ(std::string(event->group), "ftrace");
	EXPECT_EQ(event->fields.at(1).proto_field_type, kProtoString);
	EXPECT_EQ(event->fields.at(1).ftrace_type, kFtraceCString);
	EXPECT_EQ(event->fields.at(1).strategy, kCStringToString);
	}
	}

	INSTANTIATE_TEST_CASE_P(ByDevice, AllTranslationTableTest, ValuesIn(kDevices));

	TEST(TranslationTableTest, Seed) {
	std::string path =
	"src/traced/probes/ftrace/test/data/android_seed_N2F62_3.10.49/";
	FtraceProcfs ftrace_procfs(path);
	auto table = ProtoTranslationTable::Create(
	&ftrace_procfs, GetStaticEventInfo(), GetStaticCommonFieldsInfo());
	const Field& pid_field = table->common_fields().at(0);
	EXPECT_EQ(std::string(pid_field.ftrace_name), "common_pid");
	EXPECT_EQ(pid_field.proto_field_id, 2u);
	EXPECT_EQ(pid_field.ftrace_offset, 4u);
	EXPECT_EQ(pid_field.ftrace_size, 4u);

	{
	auto event = table->GetEventByName("sched_switch");
	EXPECT_EQ(std::string(event->name), "sched_switch");
	EXPECT_EQ(std::string(event->group), "sched");
	EXPECT_EQ(event->ftrace_event_id, 68ul);
	EXPECT_EQ(event->fields.at(0).ftrace_offset, 8u);
	EXPECT_EQ(event->fields.at(0).ftrace_size, 16u);
	}

	{
	auto event = table->GetEventByName("sched_wakeup");
	EXPECT_EQ(std::string(event->name), "sched_wakeup");
	EXPECT_EQ(std::string(event->group), "sched");
	EXPECT_EQ(event->ftrace_event_id, 70ul);
	EXPECT_EQ(event->fields.at(0).ftrace_offset, 8u);
	EXPECT_EQ(event->fields.at(0).ftrace_size, 16u);
	}

	{
	auto event = table->GetEventByName("cpufreq_interactive_target");
	EXPECT_EQ(std::string(event->name), "cpufreq_interactive_target");
	EXPECT_EQ(std::string(event->group), "cpufreq_interactive");
	EXPECT_EQ(event->ftrace_event_id, 509ul);
	EXPECT_EQ(event->fields.at(0).ftrace_offset, 8u);
	EXPECT_EQ(event->fields.at(0).ftrace_size, 4u);
	}

	{
	auto event = table->GetEventByName("ext4_da_write_begin");
	EXPECT_EQ(std::string(event->name), "ext4_da_write_begin");
	EXPECT_EQ(std::string(event->group), "ext4");
	EXPECT_EQ(event->ftrace_event_id, 303ul);
	EXPECT_EQ(event->fields.at(0).ftrace_offset, 8u);
	EXPECT_EQ(event->fields.at(0).ftrace_size, 4u);
	}
	}

	TEST_P(TranslationTableCreationTest, Create) {
	MockFtraceProcfs ftrace;
	std::vector<Field> common_fields;
	std::vector<Event> events;

	ON_CALL(ftrace, ReadPageHeaderFormat())
	.WillByDefault(Return(
	R"( field: u64 timestamp; offset:0; size:8; signed:0;
	field: local_t commit; offset:8; size:)" +
	std::to_string(GetParam()) + R"(; signed:1;
	field: int overwrite; offset:8; size:1; signed:1;
	field: char data; offset:16; size:4080; signed:0;)"));
	ON_CALL(ftrace, ReadEventFormat(_, _)).WillByDefault(Return(""));
	ON_CALL(ftrace, ReadEventFormat("group", "foo"))
	.WillByDefault(Return(R"(name: foo
	ID: 42
	format:
	field:unsigned short common_type; offset:0; size:2; signed:0;
	field:int common_pid; offset:4; size:4; signed:1;

	field:char field_a[16]; offset:8; size:16; signed:0;
	field:int field_b; offset:24; size:4; signed:1;
	field:int field_d; offset:28; size:4; signed:1;
	field:u32 field_e; offset:32; size:4; signed:0;

	print fmt: "some format")"));
	;

	EXPECT_CALL(ftrace, ReadEventFormat(_, _)).Times(AnyNumber());

	{
	events.emplace_back(Event{});
	Event* event = &events.back();
	event->name = "foo";
	event->group = "group";
	event->proto_field_id = 21;

	{
	// We should get this field.
	event->fields.emplace_back(Field{});
	Field* field = &event->fields.back();
	field->proto_field_id = 501;
	field->proto_field_type = kProtoString;
	field->ftrace_name = "field_a";
	}

	{
	// We shouldn't get this field: don't know how to read int -> string.
	event->fields.emplace_back(Field{});
	Field* field = &event->fields.back();
	field->proto_field_id = 502;
	field->proto_field_type = kProtoString;
	field->ftrace_name = "field_b";
	}

	{
	// We shouldn't get this field: no matching field in the format file.
	event->fields.emplace_back(Field{});
	Field* field = &event->fields.back();
	field->proto_field_id = 503;
	field->proto_field_type = kProtoString;
	field->ftrace_name = "field_c";
	}

	{
	// We should get this field.
	event->fields.emplace_back(Field{});
	Field* field = &event->fields.back();
	field->proto_field_id = 504;
	field->proto_field_type = kProtoUint64;
	field->ftrace_name = "field_e";
	}
	}

	{
	events.emplace_back(Event{});
	Event* event = &events.back();
	event->name = "bar";
	event->group = "group";
	event->proto_field_id = 22;
	}

	auto table = ProtoTranslationTable::Create(&ftrace, std::move(events),
	std::move(common_fields));
	EXPECT_EQ(table->largest_id(), 42ul);
	EXPECT_EQ(table->EventNameToFtraceId("foo"), 42ul);
	EXPECT_EQ(table->EventNameToFtraceId("bar"), 0ul);
	EXPECT_EQ(table->EventNameToFtraceId("bar"), 0ul);
	EXPECT_FALSE(table->GetEventById(43ul));
	ASSERT_TRUE(table->GetEventById(42ul));
	EXPECT_EQ(table->ftrace_page_header_spec().timestamp.size, 8);
	EXPECT_EQ(table->ftrace_page_header_spec().size.size, GetParam());
	EXPECT_EQ(table->ftrace_page_header_spec().overwrite.size, 1);
	auto event = table->GetEventById(42);
	EXPECT_EQ(event->ftrace_event_id, 42ul);
	EXPECT_EQ(event->proto_field_id, 21ul);
	EXPECT_EQ(event->size, 36u);
	EXPECT_EQ(std::string(event->name), "foo");
	EXPECT_EQ(std::string(event->group), "group");

	ASSERT_EQ(event->fields.size(), 2ul);
	auto field_a = event->fields.at(0);
	EXPECT_EQ(field_a.proto_field_id, 501ul);
	EXPECT_EQ(field_a.strategy, kFixedCStringToString);

	auto field_e = event->fields.at(1);
	EXPECT_EQ(field_e.proto_field_id, 504ul);
	EXPECT_EQ(field_e.strategy, kUint32ToUint64);
	}

	INSTANTIATE_TEST_CASE_P(BySize, TranslationTableCreationTest, Values(4, 8));

	TEST(TranslationTableTest, InferFtraceType) {
	FtraceFieldType type;

	ASSERT_TRUE(InferFtraceType("char foo[16]", 16, false, &type));
	EXPECT_EQ(type, kFtraceFixedCString);

	ASSERT_TRUE(InferFtraceType("char[] foo", 8, false, &type));
	EXPECT_EQ(type, kFtraceStringPtr);

	ASSERT_TRUE(InferFtraceType("char * foo", 8, false, &type));
	EXPECT_EQ(type, kFtraceStringPtr);

	ASSERT_TRUE(InferFtraceType("char foo[64]", 64, false, &type));
	EXPECT_EQ(type, kFtraceFixedCString);

	ASSERT_TRUE(InferFtraceType("u32 foo", 4, false, &type));
	EXPECT_EQ(type, kFtraceUint32);

	ASSERT_TRUE(InferFtraceType("i_ino foo", 4, false, &type));
	ASSERT_EQ(type, kFtraceInode32);

	ASSERT_TRUE(InferFtraceType("i_ino foo", 8, false, &type));
	ASSERT_EQ(type, kFtraceInode64);

	ASSERT_TRUE(InferFtraceType("ino_t foo", 4, false, &type));
	ASSERT_EQ(type, kFtraceInode32);

	ASSERT_TRUE(InferFtraceType("ino_t foo", 8, false, &type));
	ASSERT_EQ(type, kFtraceInode64);

	ASSERT_TRUE(InferFtraceType("dev_t foo", 4, false, &type));
	ASSERT_EQ(type, kFtraceDevId32);

	ASSERT_TRUE(InferFtraceType("dev_t foo", 8, false, &type));
	ASSERT_EQ(type, kFtraceDevId64);

	ASSERT_TRUE(InferFtraceType("pid_t foo", 4, false, &type));
	ASSERT_EQ(type, kFtracePid32);

	ASSERT_TRUE(InferFtraceType("int common_pid", 4, false, &type));
	ASSERT_EQ(type, kFtraceCommonPid32);

	ASSERT_TRUE(InferFtraceType("char foo", 1, true, &type));
	ASSERT_EQ(type, kFtraceInt8);

	ASSERT_TRUE(InferFtraceType("__data_loc char[] foo", 4, false, &type));
	ASSERT_EQ(type, kFtraceDataLoc);
	ASSERT_FALSE(InferFtraceType("__data_loc char[] foo", 8, false, &type));

	EXPECT_FALSE(InferFtraceType("foo", 64, false, &type));
	}

	TEST(TranslationTableTest, Getters) {
	std::vector<Field> common_fields;
	std::vector<Event> events;

	{
	Event event;
	event.name = "foo";
	event.group = "group_one";
	event.ftrace_event_id = 1;
	events.push_back(event);
	}

	{
	Event event;
	event.name = "bar";
	event.group = "group_one";
	event.ftrace_event_id = 2;
	events.push_back(event);
	}

	{
	Event event;
	event.name = "baz";
	event.group = "group_two";
	event.ftrace_event_id = 100;
	events.push_back(event);
	}

	ProtoTranslationTable table(
	events, std::move(common_fields),
	ProtoTranslationTable::DefaultPageHeaderSpecForTesting());
	EXPECT_EQ(table.largest_id(), 100ul);
	EXPECT_EQ(table.EventNameToFtraceId("foo"), 1ul);
	EXPECT_EQ(table.EventNameToFtraceId("baz"), 100ul);
	EXPECT_EQ(table.EventNameToFtraceId("no_such_event"), 0ul);
	EXPECT_EQ(table.GetEventById(1)->name, "foo");
	EXPECT_EQ(table.GetEventById(3), nullptr);
	EXPECT_EQ(table.GetEventById(200), nullptr);
	EXPECT_EQ(table.GetEventById(0), nullptr);
	EXPECT_EQ(table.GetEventByName("foo")->ftrace_event_id, 1u);
	EXPECT_THAT(*table.GetEventsByGroup("group_one"),
	Contains(testing::Field(&Event::name, "foo")));
	EXPECT_THAT(*table.GetEventsByGroup("group_one"),
	Contains(testing::Field(&Event::name, "bar")));
	EXPECT_THAT(*table.GetEventsByGroup("group_two"),
	Contains(testing::Field(&Event::name, "baz")));
	EXPECT_THAT(table.GetEventsByGroup("group_three"), IsNull());
	}

	} // namespace
	} // namespace perfetto