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#include <cppgc/allocation.h>
#include <cppgc/garbage-collected.h>
#include <cppgc/heap.h>
#include <node.h>
#include <v8-cppgc.h>
#include <v8.h>
#include "node_test_fixture.h"
// This tests that Node.js can work with an existing CppHeap.
// Mimic the Blink layout.
static int kWrappableTypeIndex = 0;
static int kWrappableInstanceIndex = 1;
static uint16_t kEmbedderID = 0x1;
// Mimic a class that does not know about Node.js.
class CppGCed : public cppgc::GarbageCollected<CppGCed> {
public:
static int kConstructCount;
static int kDestructCount;
static int kTraceCount;
static void New(const v8::FunctionCallbackInfo<v8::Value>& args) {
v8::Isolate* isolate = args.GetIsolate();
v8::Local<v8::Object> js_object = args.This();
CppGCed* gc_object = cppgc::MakeGarbageCollected<CppGCed>(
isolate->GetCppHeap()->GetAllocationHandle());
js_object->SetAlignedPointerInInternalField(kWrappableTypeIndex,
&kEmbedderID);
js_object->SetAlignedPointerInInternalField(kWrappableInstanceIndex,
gc_object);
kConstructCount++;
args.GetReturnValue().Set(js_object);
}
static v8::Local<v8::Function> GetConstructor(
v8::Local<v8::Context> context) {
auto ft = v8::FunctionTemplate::New(context->GetIsolate(), New);
auto ot = ft->InstanceTemplate();
ot->SetInternalFieldCount(2);
return ft->GetFunction(context).ToLocalChecked();
}
CppGCed() = default;
~CppGCed() { kDestructCount++; }
void Trace(cppgc::Visitor* visitor) const { kTraceCount++; }
};
int CppGCed::kConstructCount = 0;
int CppGCed::kDestructCount = 0;
int CppGCed::kTraceCount = 0;
TEST_F(NodeZeroIsolateTestFixture, ExistingCppHeapTest) {
v8::Isolate* isolate =
node::NewIsolate(allocator.get(), ¤t_loop, platform.get());
// Create and attach the CppHeap before we set up the IsolateData so that
// it recognizes the existing heap.
std::unique_ptr<v8::CppHeap> cpp_heap = v8::CppHeap::Create(
platform.get(),
v8::CppHeapCreateParams(
{},
v8::WrapperDescriptor(
kWrappableTypeIndex, kWrappableInstanceIndex, kEmbedderID)));
isolate->AttachCppHeap(cpp_heap.get());
// Try creating Context + IsolateData + Environment.
{
v8::Isolate::Scope isolate_scope(isolate);
v8::HandleScope handle_scope(isolate);
std::unique_ptr<node::IsolateData, decltype(&node::FreeIsolateData)>
isolate_data{
node::CreateIsolateData(isolate, ¤t_loop, platform.get()),
node::FreeIsolateData};
CHECK(isolate_data);
{
auto context = node::NewContext(isolate);
CHECK(!context.IsEmpty());
v8::Context::Scope context_scope(context);
// An Environment should already contain a few BaseObjects that are
// supposed to have non-cppgc IDs.
std::unique_ptr<node::Environment, decltype(&node::FreeEnvironment)>
environment{
node::CreateEnvironment(isolate_data.get(), context, {}, {}),
node::FreeEnvironment};
CHECK(environment);
context->Global()
->Set(context,
v8::String::NewFromUtf8(isolate, "CppGCed").ToLocalChecked(),
CppGCed::GetConstructor(context))
.FromJust();
const char* code =
"globalThis.array = [];"
"for (let i = 0; i < 100; ++i) { array.push(new CppGCed()); }";
node::LoadEnvironment(environment.get(), code).ToLocalChecked();
// Request a GC and check if CppGCed::Trace() is invoked.
isolate->LowMemoryNotification();
int exit_code = SpinEventLoop(environment.get()).FromJust();
EXPECT_EQ(exit_code, 0);
}
platform->DrainTasks(isolate);
// Cleanup.
isolate->DetachCppHeap();
cpp_heap->Terminate();
platform->DrainTasks(isolate);
}
platform->UnregisterIsolate(isolate);
isolate->Dispose();
// Check that all the objects are created and destroyed properly.
EXPECT_EQ(CppGCed::kConstructCount, 100);
EXPECT_EQ(CppGCed::kDestructCount, 100);
// GC does not have to feel pressured enough to visit all of them to
// reclaim memory before we are done with the isolate and the entire
// heap can be reclaimed. So just check at least some of them are traced.
EXPECT_GT(CppGCed::kTraceCount, 0);
}
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