v8/test/cctest/test-global-handles.cc

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#include "src/api.h"
#include "src/factory.h"
#include "src/global-handles.h"
#include "src/isolate.h"
#include "src/objects-inl.h"
#include "src/objects.h"
#include "test/cctest/cctest.h"

namespace v8 {
namespace internal {

TEST(EternalHandles) {
  CcTest::InitializeVM();
  Isolate* isolate = CcTest::i_isolate();
  v8::Isolate* v8_isolate = reinterpret_cast<v8::Isolate*>(isolate);
  EternalHandles* eternal_handles = isolate->eternal_handles();

  // Create a number of handles that will not be on a block boundary
  const int kArrayLength = 2048-1;
  int indices[kArrayLength];
  v8::Eternal<v8::Value> eternals[kArrayLength];

  CHECK_EQ(0, eternal_handles->NumberOfHandles());
  for (int i = 0; i < kArrayLength; i++) {
    indices[i] = -1;
    HandleScope scope(isolate);
    v8::Local<v8::Object> object = v8::Object::New(v8_isolate);
    object->Set(v8_isolate->GetCurrentContext(), i,
                v8::Integer::New(v8_isolate, i))
        .FromJust();
    // Create with internal api
    eternal_handles->Create(
        isolate, *v8::Utils::OpenHandle(*object), &indices[i]);
    // Create with external api
    CHECK(eternals[i].IsEmpty());
    eternals[i].Set(v8_isolate, object);
    CHECK(!eternals[i].IsEmpty());
  }

  CcTest::CollectAllAvailableGarbage();

  for (int i = 0; i < kArrayLength; i++) {
    for (int j = 0; j < 2; j++) {
      HandleScope scope(isolate);
      v8::Local<v8::Value> local;
      if (j == 0) {
        // Test internal api
        local = v8::Utils::ToLocal(eternal_handles->Get(indices[i]));
      } else {
        // Test external api
        local = eternals[i].Get(v8_isolate);
      }
      v8::Local<v8::Object> object = v8::Local<v8::Object>::Cast(local);
      v8::Local<v8::Value> value =
          object->Get(v8_isolate->GetCurrentContext(), i).ToLocalChecked();
      CHECK(value->IsInt32());
      CHECK_EQ(i,
               value->Int32Value(v8_isolate->GetCurrentContext()).FromJust());
    }
  }

  CHECK_EQ(2*kArrayLength, eternal_handles->NumberOfHandles());

  // Create an eternal via the constructor
  {
    HandleScope scope(isolate);
    v8::Local<v8::Object> object = v8::Object::New(v8_isolate);
    v8::Eternal<v8::Object> eternal(v8_isolate, object);
    CHECK(!eternal.IsEmpty());
    CHECK(object == eternal.Get(v8_isolate));
  }

  CHECK_EQ(2*kArrayLength + 1, eternal_handles->NumberOfHandles());
}


TEST(PersistentBaseGetLocal) {
  CcTest::InitializeVM();
  v8::Isolate* isolate = CcTest::isolate();

  v8::HandleScope scope(isolate);
  v8::Local<v8::Object> o = v8::Object::New(isolate);
  CHECK(!o.IsEmpty());
  v8::Persistent<v8::Object> p(isolate, o);
  CHECK(o == p.Get(isolate));
  CHECK(v8::Local<v8::Object>::New(isolate, p) == p.Get(isolate));

  v8::Global<v8::Object> g(isolate, o);
  CHECK(o == g.Get(isolate));
  CHECK(v8::Local<v8::Object>::New(isolate, g) == g.Get(isolate));
}


void WeakCallback(const v8::WeakCallbackInfo<void>& data) {}


TEST(WeakPersistentSmi) {
  CcTest::InitializeVM();
  v8::Isolate* isolate = CcTest::isolate();

  v8::HandleScope scope(isolate);
  v8::Local<v8::Number> n = v8::Number::New(isolate, 0);
  v8::Global<v8::Number> g(isolate, n);

  // Should not crash.
  g.SetWeak<void>(nullptr, &WeakCallback, v8::WeakCallbackType::kParameter);
}

void finalizer(const v8::WeakCallbackInfo<v8::Global<v8::Object>>& data) {
  data.GetParameter()->ClearWeak();
  v8::Local<v8::Object> o =
      v8::Local<v8::Object>::New(data.GetIsolate(), *data.GetParameter());
  o->Set(data.GetIsolate()->GetCurrentContext(), v8_str("finalizer"),
         v8_str("was here"))
      .FromJust();
}

TEST(FinalizerWeakness) {
  CcTest::InitializeVM();
  v8::Isolate* isolate = CcTest::isolate();

  v8::Global<v8::Object> g;
  int identity;

  {
    v8::HandleScope scope(isolate);
    v8::Local<v8::Object> o = v8::Object::New(isolate);
    identity = o->GetIdentityHash();
    g.Reset(isolate, o);
    g.SetWeak(&g, finalizer, v8::WeakCallbackType::kFinalizer);
  }

  CcTest::CollectAllAvailableGarbage();

  CHECK(!g.IsEmpty());
  v8::HandleScope scope(isolate);
  v8::Local<v8::Object> o = v8::Local<v8::Object>::New(isolate, g);
  CHECK_EQ(identity, o->GetIdentityHash());
  CHECK(o->Has(isolate->GetCurrentContext(), v8_str("finalizer")).FromJust());
}

TEST(PhatomHandlesWithoutCallbacks) {
  CcTest::InitializeVM();
  v8::Isolate* isolate = CcTest::isolate();

  v8::Global<v8::Object> g1, g2;
  {
    v8::HandleScope scope(isolate);
    g1.Reset(isolate, v8::Object::New(isolate));
    g1.SetWeak();
    g2.Reset(isolate, v8::Object::New(isolate));
    g2.SetWeak();
  }

  CHECK_EQ(0u, isolate->NumberOfPhantomHandleResetsSinceLastCall());
  CcTest::CollectAllAvailableGarbage();
  CHECK_EQ(2u, isolate->NumberOfPhantomHandleResetsSinceLastCall());
  CHECK_EQ(0u, isolate->NumberOfPhantomHandleResetsSinceLastCall());
}

namespace {

void ResurrectingFinalizer(
    const v8::WeakCallbackInfo<v8::Global<v8::Object>>& data) {
  data.GetParameter()->ClearWeak();
}

template <typename GCFunction>
void TestFinalizerKeepsPhantomAlive(v8::Isolate* isolate,
                                    GCFunction gc_function) {
  v8::Global<v8::Object> g1, g2;
  {
    v8::HandleScope scope(isolate);
    v8::Local<v8::Object> o1 =
        v8::Local<v8::Object>::New(isolate, v8::Object::New(isolate));
    v8::Local<v8::Object> o2 =
        v8::Local<v8::Object>::New(isolate, v8::Object::New(isolate));
    CHECK(reinterpret_cast<Isolate*>(isolate)->heap()->InNewSpace(
        *v8::Utils::OpenHandle(v8::Object::Cast(*o1))));
    CHECK(reinterpret_cast<Isolate*>(isolate)->heap()->InNewSpace(
        *v8::Utils::OpenHandle(v8::Object::Cast(*o2))));
    o1->Set(isolate->GetCurrentContext(), v8_str("link"), o2).FromJust();
    g1.Reset(isolate, o1);
    g2.Reset(isolate, o2);
    // g1 will be finalized but resurrected.
    g1.SetWeak(&g1, ResurrectingFinalizer, v8::WeakCallbackType::kFinalizer);
    // g2 will be a phantom handle that should not be reset as g1 transitively
    // keeps it alive.
    g2.SetWeak();
  }

  gc_function(&g1, &g2);
  // Both, g1 and g2, should stay alive as the finalizer resurrects the root
  // object that transitively keeps the other one alive.
  CHECK(!g1.IsEmpty());
  CHECK(!g2.IsEmpty());
}

}  // namespace

TEST(FinalizerKeepsPhantomAliveOnMarkCompact) {
  // See crbug.com/772299.
  CcTest::InitializeVM();
  TestFinalizerKeepsPhantomAlive(
      CcTest::isolate(),
      [](v8::Global<v8::Object>* g1, v8::Global<v8::Object>* g2) {
        CcTest::CollectAllAvailableGarbage();
      });
}

TEST(FinalizerKeepsPhantomAliveOnScavenge) {
  CcTest::InitializeVM();
  TestFinalizerKeepsPhantomAlive(
      CcTest::isolate(),
      [](v8::Global<v8::Object>* g1, v8::Global<v8::Object>* g2) {
        g1->MarkIndependent();
        g2->MarkIndependent();
        CcTest::CollectGarbage(i::NEW_SPACE);
      });
}

}  // namespace internal
}  // namespace v8