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// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Tests of sampler functionalities.
#include "src/libsampler/sampler.h"
#include "src/base/platform/platform.h"
#include "src/base/platform/time.h"
#include "test/cctest/cctest.h"
namespace v8 {
namespace sampler {
namespace {
class TestSamplingThread : public base::Thread {
public:
static const int kSamplerThreadStackSize = 64 * 1024;
explicit TestSamplingThread(Sampler* sampler)
: Thread(base::Thread::Options("TestSamplingThread",
kSamplerThreadStackSize)),
sampler_(sampler) {}
// Implement Thread::Run().
void Run() override {
while (sampler_->IsActive()) {
sampler_->DoSample();
base::OS::Sleep(base::TimeDelta::FromMilliseconds(1));
}
}
private:
Sampler* sampler_;
};
class TestSampler : public Sampler {
public:
explicit TestSampler(Isolate* isolate) : Sampler(isolate) {}
void SampleStack(const v8::RegisterState& regs) override {
void* frames[kMaxFramesCount];
SampleInfo sample_info;
isolate()->GetStackSample(regs, frames, kMaxFramesCount, &sample_info);
if (is_counting_samples_) {
if (sample_info.vm_state == JS) ++js_sample_count_;
if (sample_info.vm_state == EXTERNAL) ++external_sample_count_;
}
}
};
class TestApiCallbacks {
public:
TestApiCallbacks() = default;
static void Getter(v8::Local<v8::String> name,
const v8::PropertyCallbackInfo<v8::Value>& info) {
}
static void Setter(v8::Local<v8::String> name,
v8::Local<v8::Value> value,
const v8::PropertyCallbackInfo<void>& info) {
}
};
static void RunSampler(v8::Local<v8::Context> env,
v8::Local<v8::Function> function,
v8::Local<v8::Value> argv[], int argc,
unsigned min_js_samples = 0,
unsigned min_external_samples = 0) {
TestSampler sampler(env->GetIsolate());
TestSamplingThread thread(&sampler);
sampler.Start();
sampler.StartCountingSamples();
thread.StartSynchronously();
do {
function->Call(env, env->Global(), argc, argv).ToLocalChecked();
} while (sampler.js_sample_count() < min_js_samples ||
sampler.external_sample_count() < min_external_samples);
sampler.Stop();
thread.Join();
}
} // namespace
static const char* sampler_test_source = "function start(count) {\n"
" for (var i = 0; i < count; i++) {\n"
" var o = instance.foo;\n"
" instance.foo = o + 1;\n"
" }\n"
"}\n";
static v8::Local<v8::Function> GetFunction(v8::Local<v8::Context> env,
const char* name) {
return v8::Local<v8::Function>::Cast(
env->Global()->Get(env, v8_str(name)).ToLocalChecked());
}
TEST(LibSamplerCollectSample) {
LocalContext env;
v8::Isolate* isolate = env->GetIsolate();
v8::HandleScope scope(isolate);
v8::Local<v8::FunctionTemplate> func_template =
v8::FunctionTemplate::New(isolate);
v8::Local<v8::ObjectTemplate> instance_template =
func_template->InstanceTemplate();
TestApiCallbacks accessors;
v8::Local<v8::External> data =
v8::External::New(isolate, &accessors);
instance_template->SetAccessor(v8_str("foo"), &TestApiCallbacks::Getter,
&TestApiCallbacks::Setter, data);
v8::Local<v8::Function> func =
func_template->GetFunction(env.local()).ToLocalChecked();
v8::Local<v8::Object> instance =
func->NewInstance(env.local()).ToLocalChecked();
env->Global()->Set(env.local(), v8_str("instance"), instance).FromJust();
CompileRun(sampler_test_source);
v8::Local<v8::Function> function = GetFunction(env.local(), "start");
int32_t repeat_count = 100;
v8::Local<v8::Value> args[] = {v8::Integer::New(isolate, repeat_count)};
RunSampler(env.local(), function, args, arraysize(args), 100, 100);
}
#ifdef USE_SIGNALS
class CountingSampler : public Sampler {
public:
explicit CountingSampler(Isolate* isolate) : Sampler(isolate) {}
void SampleStack(const v8::RegisterState& regs) override { sample_count_++; }
int sample_count() { return sample_count_; }
void set_active(bool active) { SetActive(active); }
private:
int sample_count_ = 0;
};
TEST(SamplerManager_AddRemoveSampler) {
LocalContext env;
v8::Isolate* isolate = env->GetIsolate();
SamplerManager* manager = SamplerManager::instance();
CountingSampler sampler1(isolate);
sampler1.set_active(true);
CHECK_EQ(0, sampler1.sample_count());
manager->AddSampler(&sampler1);
RegisterState state;
manager->DoSample(state);
CHECK_EQ(1, sampler1.sample_count());
sampler1.set_active(true);
manager->RemoveSampler(&sampler1);
sampler1.set_active(false);
manager->DoSample(state);
CHECK_EQ(1, sampler1.sample_count());
}
TEST(SamplerManager_DoesNotReAdd) {
LocalContext env;
v8::Isolate* isolate = env->GetIsolate();
// Add the same sampler twice, but check we only get one sample for it.
SamplerManager* manager = SamplerManager::instance();
CountingSampler sampler1(isolate);
sampler1.set_active(true);
manager->AddSampler(&sampler1);
manager->AddSampler(&sampler1);
RegisterState state;
manager->DoSample(state);
CHECK_EQ(1, sampler1.sample_count());
sampler1.set_active(false);
}
TEST(AtomicGuard_GetNonBlockingSuccess) {
std::atomic_bool atomic{false};
{
AtomicGuard guard(&atomic, false);
CHECK(guard.is_success());
AtomicGuard guard2(&atomic, false);
CHECK(!guard2.is_success());
}
AtomicGuard guard(&atomic, false);
CHECK(guard.is_success());
}
TEST(AtomicGuard_GetBlockingSuccess) {
std::atomic_bool atomic{false};
{
AtomicGuard guard(&atomic);
CHECK(guard.is_success());
AtomicGuard guard2(&atomic, false);
CHECK(!guard2.is_success());
}
AtomicGuard guard(&atomic);
CHECK(guard.is_success());
}
#endif // USE_SIGNALS
} // namespace sampler
} // namespace v8
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