v8/test/cctest/test-cpu-profiler.cc

// Copyright 2010 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
//     * Redistributions of source code must retain the above copyright
//       notice, this list of conditions and the following disclaimer.
//     * Redistributions in binary form must reproduce the above
//       copyright notice, this list of conditions and the following
//       disclaimer in the documentation and/or other materials provided
//       with the distribution.
//     * Neither the name of Google Inc. nor the names of its
//       contributors may be used to endorse or promote products derived
//       from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Tests of profiles generator and utilities.

// TODO(dcarney): remove
#define V8_ALLOW_ACCESS_TO_PERSISTENT_ARROW
#define V8_ALLOW_ACCESS_TO_PERSISTENT_IMPLICIT

#define V8_DISABLE_DEPRECATIONS 1
#include "v8.h"
#include "cpu-profiler-inl.h"
#include "cctest.h"
#include "utils.h"
#include "../include/v8-profiler.h"
#undef V8_DISABLE_DEPRECATIONS

using i::CodeEntry;
using i::CpuProfile;
using i::CpuProfiler;
using i::CpuProfilesCollection;
using i::ProfileGenerator;
using i::ProfileNode;
using i::ProfilerEventsProcessor;
using i::ScopedVector;
using i::TokenEnumerator;
using i::Vector;


TEST(StartStop) {
  CpuProfilesCollection profiles;
  ProfileGenerator generator(&profiles);
  ProfilerEventsProcessor processor(&generator, &profiles);
  processor.Start();
  processor.Stop();
  processor.Join();
}

static inline i::Address ToAddress(int n) {
  return reinterpret_cast<i::Address>(n);
}

static void EnqueueTickSampleEvent(ProfilerEventsProcessor* proc,
                                   i::Address frame1,
                                   i::Address frame2 = NULL,
                                   i::Address frame3 = NULL) {
  i::TickSample* sample = proc->TickSampleEvent();
  sample->pc = frame1;
  sample->tos = frame1;
  sample->frames_count = 0;
  if (frame2 != NULL) {
    sample->stack[0] = frame2;
    sample->frames_count = 1;
  }
  if (frame3 != NULL) {
    sample->stack[1] = frame3;
    sample->frames_count = 2;
  }
}

namespace {

class TestSetup {
 public:
  TestSetup()
      : old_flag_prof_browser_mode_(i::FLAG_prof_browser_mode) {
    i::FLAG_prof_browser_mode = false;
  }

  ~TestSetup() {
    i::FLAG_prof_browser_mode = old_flag_prof_browser_mode_;
  }

 private:
  bool old_flag_prof_browser_mode_;
};

}  // namespace

TEST(CodeEvents) {
  CcTest::InitializeVM();
  i::Isolate* isolate = i::Isolate::Current();
  i::Heap* heap = isolate->heap();
  i::Factory* factory = isolate->factory();
  TestSetup test_setup;
  CpuProfilesCollection profiles;
  profiles.StartProfiling("", 1, false);
  ProfileGenerator generator(&profiles);
  ProfilerEventsProcessor processor(&generator, &profiles);
  processor.Start();

  // Enqueue code creation events.
  i::HandleScope scope(isolate);
  const char* aaa_str = "aaa";
  i::Handle<i::String> aaa_name = factory->NewStringFromAscii(
      i::Vector<const char>(aaa_str, i::StrLength(aaa_str)));
  processor.CodeCreateEvent(i::Logger::FUNCTION_TAG,
                            *aaa_name,
                            heap->empty_string(),
                            0,
                            ToAddress(0x1000),
                            0x100,
                            ToAddress(0x10000),
                            NULL);
  processor.CodeCreateEvent(i::Logger::BUILTIN_TAG,
                            "bbb",
                            ToAddress(0x1200),
                            0x80);
  processor.CodeCreateEvent(i::Logger::STUB_TAG, 5, ToAddress(0x1300), 0x10);
  processor.CodeCreateEvent(i::Logger::BUILTIN_TAG,
                            "ddd",
                            ToAddress(0x1400),
                            0x80);
  processor.CodeMoveEvent(ToAddress(0x1400), ToAddress(0x1500));
  processor.CodeCreateEvent(i::Logger::STUB_TAG, 3, ToAddress(0x1600), 0x10);
  processor.CodeCreateEvent(i::Logger::STUB_TAG, 4, ToAddress(0x1605), 0x10);
  // Enqueue a tick event to enable code events processing.
  EnqueueTickSampleEvent(&processor, ToAddress(0x1000));

  processor.Stop();
  processor.Join();

  // Check the state of profile generator.
  CodeEntry* entry1 = generator.code_map()->FindEntry(ToAddress(0x1000));
  CHECK_NE(NULL, entry1);
  CHECK_EQ(aaa_str, entry1->name());
  CodeEntry* entry2 = generator.code_map()->FindEntry(ToAddress(0x1200));
  CHECK_NE(NULL, entry2);
  CHECK_EQ("bbb", entry2->name());
  CodeEntry* entry3 = generator.code_map()->FindEntry(ToAddress(0x1300));
  CHECK_NE(NULL, entry3);
  CHECK_EQ("5", entry3->name());
  CHECK_EQ(NULL, generator.code_map()->FindEntry(ToAddress(0x1400)));
  CodeEntry* entry4 = generator.code_map()->FindEntry(ToAddress(0x1500));
  CHECK_NE(NULL, entry4);
  CHECK_EQ("ddd", entry4->name());
  CHECK_EQ(NULL, generator.code_map()->FindEntry(ToAddress(0x1600)));
}


template<typename T>
static int CompareProfileNodes(const T* p1, const T* p2) {
  return strcmp((*p1)->entry()->name(), (*p2)->entry()->name());
}

TEST(TickEvents) {
  TestSetup test_setup;
  CpuProfilesCollection profiles;
  profiles.StartProfiling("", 1, false);
  ProfileGenerator generator(&profiles);
  ProfilerEventsProcessor processor(&generator, &profiles);
  processor.Start();

  processor.CodeCreateEvent(i::Logger::BUILTIN_TAG,
                            "bbb",
                            ToAddress(0x1200),
                            0x80);
  processor.CodeCreateEvent(i::Logger::STUB_TAG, 5, ToAddress(0x1300), 0x10);
  processor.CodeCreateEvent(i::Logger::BUILTIN_TAG,
                            "ddd",
                            ToAddress(0x1400),
                            0x80);
  EnqueueTickSampleEvent(&processor, ToAddress(0x1210));
  EnqueueTickSampleEvent(&processor, ToAddress(0x1305), ToAddress(0x1220));
  EnqueueTickSampleEvent(&processor,
                         ToAddress(0x1404),
                         ToAddress(0x1305),
                         ToAddress(0x1230));

  processor.Stop();
  processor.Join();
  CpuProfile* profile =
      profiles.StopProfiling(TokenEnumerator::kNoSecurityToken, "", 1);
  CHECK_NE(NULL, profile);

  // Check call trees.
  const i::List<ProfileNode*>* top_down_root_children =
      profile->top_down()->root()->children();
  CHECK_EQ(1, top_down_root_children->length());
  CHECK_EQ("bbb", top_down_root_children->last()->entry()->name());
  const i::List<ProfileNode*>* top_down_bbb_children =
      top_down_root_children->last()->children();
  CHECK_EQ(1, top_down_bbb_children->length());
  CHECK_EQ("5", top_down_bbb_children->last()->entry()->name());
  const i::List<ProfileNode*>* top_down_stub_children =
      top_down_bbb_children->last()->children();
  CHECK_EQ(1, top_down_stub_children->length());
  CHECK_EQ("ddd", top_down_stub_children->last()->entry()->name());
  const i::List<ProfileNode*>* top_down_ddd_children =
      top_down_stub_children->last()->children();
  CHECK_EQ(0, top_down_ddd_children->length());
}


// http://crbug/51594
// This test must not crash.
TEST(CrashIfStoppingLastNonExistentProfile) {
  CcTest::InitializeVM();
  TestSetup test_setup;
  CpuProfiler* profiler = i::Isolate::Current()->cpu_profiler();
  profiler->StartProfiling("1");
  profiler->StopProfiling("2");
  profiler->StartProfiling("1");
  profiler->StopProfiling("");
}


// http://code.google.com/p/v8/issues/detail?id=1398
// Long stacks (exceeding max frames limit) must not be erased.
TEST(Issue1398) {
  TestSetup test_setup;
  CpuProfilesCollection profiles;
  profiles.StartProfiling("", 1, false);
  ProfileGenerator generator(&profiles);
  ProfilerEventsProcessor processor(&generator, &profiles);
  processor.Start();

  processor.CodeCreateEvent(i::Logger::BUILTIN_TAG,
                            "bbb",
                            ToAddress(0x1200),
                            0x80);

  i::TickSample* sample = processor.TickSampleEvent();
  sample->pc = ToAddress(0x1200);
  sample->tos = 0;
  sample->frames_count = i::TickSample::kMaxFramesCount;
  for (int i = 0; i < sample->frames_count; ++i) {
    sample->stack[i] = ToAddress(0x1200);
  }

  processor.Stop();
  processor.Join();
  CpuProfile* profile =
      profiles.StopProfiling(TokenEnumerator::kNoSecurityToken, "", 1);
  CHECK_NE(NULL, profile);

  int actual_depth = 0;
  const ProfileNode* node = profile->top_down()->root();
  while (node->children()->length() > 0) {
    node = node->children()->last();
    ++actual_depth;
  }

  CHECK_EQ(1 + i::TickSample::kMaxFramesCount, actual_depth);  // +1 for PC.
}


TEST(DeleteAllCpuProfiles) {
  CcTest::InitializeVM();
  TestSetup test_setup;
  CpuProfiler* profiler = i::Isolate::Current()->cpu_profiler();
  CHECK_EQ(0, profiler->GetProfilesCount());
  profiler->DeleteAllProfiles();
  CHECK_EQ(0, profiler->GetProfilesCount());

  profiler->StartProfiling("1");
  profiler->StopProfiling("1");
  CHECK_EQ(1, profiler->GetProfilesCount());
  profiler->DeleteAllProfiles();
  CHECK_EQ(0, profiler->GetProfilesCount());
  profiler->StartProfiling("1");
  profiler->StartProfiling("2");
  profiler->StopProfiling("2");
  profiler->StopProfiling("1");
  CHECK_EQ(2, profiler->GetProfilesCount());
  profiler->DeleteAllProfiles();
  CHECK_EQ(0, profiler->GetProfilesCount());

  // Test profiling cancellation by the 'delete' command.
  profiler->StartProfiling("1");
  profiler->StartProfiling("2");
  CHECK_EQ(0, profiler->GetProfilesCount());
  profiler->DeleteAllProfiles();
  CHECK_EQ(0, profiler->GetProfilesCount());
}


static const v8::CpuProfile* FindCpuProfile(v8::CpuProfiler* profiler,
                                            unsigned uid) {
  int length = profiler->GetProfileCount();
  for (int i = 0; i < length; i++) {
    const v8::CpuProfile* profile = profiler->GetCpuProfile(i);
    if (profile->GetUid() == uid) {
      return profile;
    }
  }
  return NULL;
}


TEST(DeleteCpuProfile) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());
  v8::CpuProfiler* cpu_profiler = env->GetIsolate()->GetCpuProfiler();

  CHECK_EQ(0, cpu_profiler->GetProfileCount());
  v8::Local<v8::String> name1 = v8::String::New("1");
  cpu_profiler->StartCpuProfiling(name1);
  const v8::CpuProfile* p1 = cpu_profiler->StopCpuProfiling(name1);
  CHECK_NE(NULL, p1);
  CHECK_EQ(1, cpu_profiler->GetProfileCount());
  unsigned uid1 = p1->GetUid();
  CHECK_EQ(p1, FindCpuProfile(cpu_profiler, uid1));
  const_cast<v8::CpuProfile*>(p1)->Delete();
  CHECK_EQ(0, cpu_profiler->GetProfileCount());
  CHECK_EQ(NULL, FindCpuProfile(cpu_profiler, uid1));

  v8::Local<v8::String> name2 = v8::String::New("2");
  cpu_profiler->StartCpuProfiling(name2);
  const v8::CpuProfile* p2 = cpu_profiler->StopCpuProfiling(name2);
  CHECK_NE(NULL, p2);
  CHECK_EQ(1, cpu_profiler->GetProfileCount());
  unsigned uid2 = p2->GetUid();
  CHECK_NE(static_cast<int>(uid1), static_cast<int>(uid2));
  CHECK_EQ(p2, FindCpuProfile(cpu_profiler, uid2));
  CHECK_EQ(NULL, FindCpuProfile(cpu_profiler, uid1));
  v8::Local<v8::String> name3 = v8::String::New("3");
  cpu_profiler->StartCpuProfiling(name3);
  const v8::CpuProfile* p3 = cpu_profiler->StopCpuProfiling(name3);
  CHECK_NE(NULL, p3);
  CHECK_EQ(2, cpu_profiler->GetProfileCount());
  unsigned uid3 = p3->GetUid();
  CHECK_NE(static_cast<int>(uid1), static_cast<int>(uid3));
  CHECK_EQ(p3, FindCpuProfile(cpu_profiler, uid3));
  CHECK_EQ(NULL, FindCpuProfile(cpu_profiler, uid1));
  const_cast<v8::CpuProfile*>(p2)->Delete();
  CHECK_EQ(1, cpu_profiler->GetProfileCount());
  CHECK_EQ(NULL, FindCpuProfile(cpu_profiler, uid2));
  CHECK_EQ(p3, FindCpuProfile(cpu_profiler, uid3));
  const_cast<v8::CpuProfile*>(p3)->Delete();
  CHECK_EQ(0, cpu_profiler->GetProfileCount());
  CHECK_EQ(NULL, FindCpuProfile(cpu_profiler, uid3));
  CHECK_EQ(NULL, FindCpuProfile(cpu_profiler, uid2));
  CHECK_EQ(NULL, FindCpuProfile(cpu_profiler, uid1));
}


TEST(DeleteCpuProfileDifferentTokens) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());
  v8::CpuProfiler* cpu_profiler = env->GetIsolate()->GetCpuProfiler();

  CHECK_EQ(0, cpu_profiler->GetProfileCount());
  v8::Local<v8::String> name1 = v8::String::New("1");
  cpu_profiler->StartCpuProfiling(name1);
  const v8::CpuProfile* p1 = cpu_profiler->StopCpuProfiling(name1);
  CHECK_NE(NULL, p1);
  CHECK_EQ(1, cpu_profiler->GetProfileCount());
  unsigned uid1 = p1->GetUid();
  CHECK_EQ(p1, cpu_profiler->FindCpuProfile(uid1));
  v8::Local<v8::String> token1 = v8::String::New("token1");
  const v8::CpuProfile* p1_t1 = cpu_profiler->FindCpuProfile(uid1, token1);
  CHECK_NE(NULL, p1_t1);
  CHECK_NE(p1, p1_t1);
  CHECK_EQ(1, cpu_profiler->GetProfileCount());
  const_cast<v8::CpuProfile*>(p1)->Delete();
  CHECK_EQ(0, cpu_profiler->GetProfileCount());
  CHECK_EQ(NULL, cpu_profiler->FindCpuProfile(uid1));
  CHECK_EQ(NULL, cpu_profiler->FindCpuProfile(uid1, token1));
  const_cast<v8::CpuProfile*>(p1_t1)->Delete();
  CHECK_EQ(0, cpu_profiler->GetProfileCount());

  v8::Local<v8::String> name2 = v8::String::New("2");
  cpu_profiler->StartCpuProfiling(name2);
  v8::Local<v8::String> token2 = v8::String::New("token2");
  const v8::CpuProfile* p2_t2 = cpu_profiler->StopCpuProfiling(name2, token2);
  CHECK_NE(NULL, p2_t2);
  CHECK_EQ(1, cpu_profiler->GetProfileCount());
  unsigned uid2 = p2_t2->GetUid();
  CHECK_NE(static_cast<int>(uid1), static_cast<int>(uid2));
  const v8::CpuProfile* p2 = cpu_profiler->FindCpuProfile(uid2);
  CHECK_NE(p2_t2, p2);
  v8::Local<v8::String> name3 = v8::String::New("3");
  cpu_profiler->StartCpuProfiling(name3);
  const v8::CpuProfile* p3 = cpu_profiler->StopCpuProfiling(name3);
  CHECK_NE(NULL, p3);
  CHECK_EQ(2, cpu_profiler->GetProfileCount());
  unsigned uid3 = p3->GetUid();
  CHECK_NE(static_cast<int>(uid1), static_cast<int>(uid3));
  CHECK_EQ(p3, cpu_profiler->FindCpuProfile(uid3));
  const_cast<v8::CpuProfile*>(p2_t2)->Delete();
  CHECK_EQ(1, cpu_profiler->GetProfileCount());
  CHECK_EQ(NULL, cpu_profiler->FindCpuProfile(uid2));
  CHECK_EQ(p3, cpu_profiler->FindCpuProfile(uid3));
  const_cast<v8::CpuProfile*>(p2)->Delete();
  CHECK_EQ(1, cpu_profiler->GetProfileCount());
  CHECK_EQ(NULL, cpu_profiler->FindCpuProfile(uid2));
  CHECK_EQ(p3, cpu_profiler->FindCpuProfile(uid3));
  const_cast<v8::CpuProfile*>(p3)->Delete();
  CHECK_EQ(0, cpu_profiler->GetProfileCount());
  CHECK_EQ(NULL, cpu_profiler->FindCpuProfile(uid3));
}


static bool ContainsString(v8::Handle<v8::String> string,
                           const Vector<v8::Handle<v8::String> >& vector) {
  for (int i = 0; i < vector.length(); i++) {
    if (string->Equals(vector[i]))
      return true;
  }
  return false;
}


static void CheckChildrenNames(const v8::CpuProfileNode* node,
                               const Vector<v8::Handle<v8::String> >& names) {
  int count = node->GetChildrenCount();
  for (int i = 0; i < count; i++) {
    v8::Handle<v8::String> name = node->GetChild(i)->GetFunctionName();
    CHECK(ContainsString(name, names));
    // Check that there are no duplicates.
    for (int j = 0; j < count; j++) {
      if (j == i) continue;
      CHECK_NE(name, node->GetChild(j)->GetFunctionName());
    }
  }
}


static const v8::CpuProfileNode* FindChild(const v8::CpuProfileNode* node,
                                           const char* name) {
  int count = node->GetChildrenCount();
  v8::Handle<v8::String> nameHandle = v8::String::New(name);
  for (int i = 0; i < count; i++) {
    const v8::CpuProfileNode* child = node->GetChild(i);
    if (nameHandle->Equals(child->GetFunctionName())) return child;
  }
  return NULL;
}


static const v8::CpuProfileNode* GetChild(const v8::CpuProfileNode* node,
                                          const char* name) {
  const v8::CpuProfileNode* result = FindChild(node, name);
  CHECK(result);
  return result;
}


static void CheckSimpleBranch(const v8::CpuProfileNode* node,
                              const char* names[], int length) {
  for (int i = 0; i < length; i++) {
    const char* name = names[i];
    node = GetChild(node, name);
    int expectedChildrenCount = (i == length - 1) ? 0 : 1;
    CHECK_EQ(expectedChildrenCount, node->GetChildrenCount());
  }
}


static const char* cpu_profiler_test_source = "function loop(timeout) {\n"
"  this.mmm = 0;\n"
"  var start = Date.now();\n"
"  while (Date.now() - start < timeout) {\n"
"    var n = 100*1000;\n"
"    while(n > 1) {\n"
"      n--;\n"
"      this.mmm += n * n * n;\n"
"    }\n"
"  }\n"
"}\n"
"function delay() { try { loop(10); } catch(e) { } }\n"
"function bar() { delay(); }\n"
"function baz() { delay(); }\n"
"function foo() {\n"
"    try {\n"
"       delay();\n"
"       bar();\n"
"       delay();\n"
"       baz();\n"
"    } catch (e) { }\n"
"}\n"
"function start(timeout) {\n"
"  var start = Date.now();\n"
"  do {\n"
"    foo();\n"
"    var duration = Date.now() - start;\n"
"  } while (duration < timeout);\n"
"  return duration;\n"
"}\n";


// Check that the profile tree for the script above will look like the
// following:
//
// [Top down]:
//  1062     0   (root) [-1]
//  1054     0    start [-1]
//  1054     1      foo [-1]
//   265     0        baz [-1]
//   265     1          delay [-1]
//   264   264            loop [-1]
//   525     3        delay [-1]
//   522   522          loop [-1]
//   263     0        bar [-1]
//   263     1          delay [-1]
//   262   262            loop [-1]
//     2     2    (program) [-1]
//     6     6    (garbage collector) [-1]
TEST(CollectCpuProfile) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  v8::Script::Compile(v8::String::New(cpu_profiler_test_source))->Run();
  v8::Local<v8::Function> function = v8::Local<v8::Function>::Cast(
      env->Global()->Get(v8::String::New("start")));

  v8::CpuProfiler* cpu_profiler = env->GetIsolate()->GetCpuProfiler();
  v8::Local<v8::String> profile_name = v8::String::New("my_profile");

  cpu_profiler->StartCpuProfiling(profile_name);
  int32_t profiling_interval_ms = 200;
#if defined(_WIN32) || defined(_WIN64)
  // 200ms is not enough on Windows. See
  // https://code.google.com/p/v8/issues/detail?id=2628
  profiling_interval_ms = 500;
#endif
  v8::Handle<v8::Value> args[] = { v8::Integer::New(profiling_interval_ms) };
  function->Call(env->Global(), ARRAY_SIZE(args), args);
  const v8::CpuProfile* profile = cpu_profiler->StopCpuProfiling(profile_name);

  CHECK_NE(NULL, profile);
  // Dump collected profile to have a better diagnostic in case of failure.
  reinterpret_cast<i::CpuProfile*>(
      const_cast<v8::CpuProfile*>(profile))->Print();

  const v8::CpuProfileNode* root = profile->GetTopDownRoot();

  ScopedVector<v8::Handle<v8::String> > names(3);
  names[0] = v8::String::New(ProfileGenerator::kGarbageCollectorEntryName);
  names[1] = v8::String::New(ProfileGenerator::kProgramEntryName);
  names[2] = v8::String::New("start");
  CheckChildrenNames(root, names);

  const v8::CpuProfileNode* startNode = GetChild(root, "start");
  CHECK_EQ(1, startNode->GetChildrenCount());

  const v8::CpuProfileNode* fooNode = GetChild(startNode, "foo");
  CHECK_EQ(3, fooNode->GetChildrenCount());

  const char* barBranch[] = { "bar", "delay", "loop" };
  CheckSimpleBranch(fooNode, barBranch, ARRAY_SIZE(barBranch));
  const char* bazBranch[] = { "baz", "delay", "loop" };
  CheckSimpleBranch(fooNode, bazBranch, ARRAY_SIZE(bazBranch));
  const char* delayBranch[] = { "delay", "loop" };
  CheckSimpleBranch(fooNode, delayBranch, ARRAY_SIZE(delayBranch));

  cpu_profiler->DeleteAllCpuProfiles();
}



static const char* cpu_profiler_test_source2 = "function loop() {}\n"
"function delay() { loop(); }\n"
"function start(count) {\n"
"  var k = 0;\n"
"  do {\n"
"    delay();\n"
"  } while (++k < count*100*1000);\n"
"}\n";

// Check that the profile tree doesn't contain unexpecte traces:
//  - 'loop' can be called only by 'delay'
//  - 'delay' may be called only by 'start'
// The profile will look like the following:
//
// [Top down]:
//   135     0   (root) [-1] #1
//   121    72    start [-1] #3
//    49    33      delay [-1] #4
//    16    16        loop [-1] #5
//    14    14    (program) [-1] #2
TEST(SampleWhenFrameIsNotSetup) {
  LocalContext env;
  v8::HandleScope scope(env->GetIsolate());

  v8::Script::Compile(v8::String::New(cpu_profiler_test_source2))->Run();
  v8::Local<v8::Function> function = v8::Local<v8::Function>::Cast(
      env->Global()->Get(v8::String::New("start")));

  v8::CpuProfiler* cpu_profiler = env->GetIsolate()->GetCpuProfiler();
  v8::Local<v8::String> profile_name = v8::String::New("my_profile");

  cpu_profiler->StartCpuProfiling(profile_name);
  int32_t repeat_count = 100;
#if defined(USE_SIMULATOR)
  // Simulators are much slower.
  repeat_count = 1;
#endif
  v8::Handle<v8::Value> args[] = { v8::Integer::New(repeat_count) };
  function->Call(env->Global(), ARRAY_SIZE(args), args);
  const v8::CpuProfile* profile = cpu_profiler->StopCpuProfiling(profile_name);

  CHECK_NE(NULL, profile);
  // Dump collected profile to have a better diagnostic in case of failure.
  reinterpret_cast<i::CpuProfile*>(
      const_cast<v8::CpuProfile*>(profile))->Print();

  const v8::CpuProfileNode* root = profile->GetTopDownRoot();

  ScopedVector<v8::Handle<v8::String> > names(3);
  names[0] = v8::String::New(ProfileGenerator::kGarbageCollectorEntryName);
  names[1] = v8::String::New(ProfileGenerator::kProgramEntryName);
  names[2] = v8::String::New("start");
  CheckChildrenNames(root, names);

  const v8::CpuProfileNode* startNode = FindChild(root, "start");
  // On slow machines there may be no meaningfull samples at all, skip the
  // check there.
  if (startNode && startNode->GetChildrenCount() > 0) {
    CHECK_EQ(1, startNode->GetChildrenCount());
    const v8::CpuProfileNode* delayNode = GetChild(startNode, "delay");
    if (delayNode->GetChildrenCount() > 0) {
      CHECK_EQ(1, delayNode->GetChildrenCount());
      GetChild(delayNode, "loop");
    }
  }

  cpu_profiler->DeleteAllCpuProfiles();
}