Add tests for serialization of v8::CFunction

The tests are modeled after another patch that includes
v8::CFunctions into Node.js's builtin snapshot.

Refs: https://github.com/nodejs/node/pull/40649
Change-Id: I5a91682f7944ef06a0d3caf7333b09f974bcd64b
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3251138
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Commit-Queue: Joyee Cheung <joyee@igalia.com>
Cr-Commit-Position: refs/heads/main@{#77726}

test/cctest/test-serialize.cc

@@ -29,6 +29,7 @@
 #include <sys/stat.h>
 
 #include "include/v8-extension.h"
+#include "include/v8-fast-api-calls.h"
 #include "include/v8-function.h"
 #include "include/v8-locker.h"
 #include "src/api/api-inl.h"
@@ -3102,6 +3103,160 @@ UNINITIALIZED_TEST(SnapshotCreatorShortExternalReferences) {
   FreeCurrentEmbeddedBlob();
 }
 
+class FastApiReceiver {
+ public:
+  static void FastCallback(v8::Local<v8::Object> receiver) {
+    FastApiReceiver* receiver_ptr = static_cast<FastApiReceiver*>(
+        receiver->GetAlignedPointerFromInternalField(0));
+    CHECK_EQ(receiver_ptr, &instance);
+    receiver_ptr->result_ |= ApiCheckerResult::kFastCalled;
+  }
+
+  static void SlowCallback(const v8::FunctionCallbackInfo<v8::Value>& info) {
+    v8::Object* receiver = v8::Object::Cast(*info.Holder());
+    FastApiReceiver* receiver_ptr = static_cast<FastApiReceiver*>(
+        receiver->GetAlignedPointerFromInternalField(0));
+    CHECK_EQ(receiver_ptr, &instance);
+    receiver_ptr->result_ |= ApiCheckerResult::kSlowCalled;
+  }
+
+  static v8::StartupData SerializeInternalFields(v8::Local<v8::Object> holder,
+                                                 int index, void* data) {
+    void* ptr = holder->GetAlignedPointerFromInternalField(index);
+    if (ptr != &instance) {
+      return {nullptr, 0};
+    }
+    // Use a 1-byte payload to tell that it's a FastApiReceiver.
+    char* payload = new char[1];
+    return {payload, 1};
+  }
+
+  static void DeserializeInternalFields(v8::Local<v8::Object> holder, int index,
+                                        v8::StartupData payload, void* data) {
+    if (payload.raw_size == 0) {
+      holder->SetAlignedPointerInInternalField(index, nullptr);
+      return;
+    }
+
+    // Reset the state for testing.
+    instance.result_ = ApiCheckerResult::kNotCalled;
+    holder->SetAlignedPointerInInternalField(index, &instance);
+  }
+
+  bool DidCallFast() const { return (result_ & ApiCheckerResult::kFastCalled); }
+  bool DidCallSlow() const { return (result_ & ApiCheckerResult::kSlowCalled); }
+
+  static FastApiReceiver instance;
+  v8::CFunction c_function = v8::CFunction::Make(FastCallback);
+
+ private:
+  ApiCheckerResultFlags result_ = ApiCheckerResult::kNotCalled;
+};
+
+FastApiReceiver FastApiReceiver::instance;
+// A CFunction comes with three external references: the fast calback,
+// the slow callback, and the type info.
+intptr_t c_function_external_references[] = {
+    reinterpret_cast<intptr_t>(FastApiReceiver::FastCallback),
+    reinterpret_cast<intptr_t>(FastApiReceiver::SlowCallback),
+    reinterpret_cast<intptr_t>(
+        FastApiReceiver::instance.c_function.GetTypeInfo()),
+    0};
+
+UNINITIALIZED_TEST(CFunction) {
+#ifndef V8_LITE_MODE
+  if (i::FLAG_jitless) return;
+  if (!i::FLAG_opt) return;
+
+  i::FLAG_turbo_fast_api_calls = true;
+  i::FLAG_allow_natives_syntax = true;
+  // Disable --always_opt, otherwise we haven't generated the necessary
+  // feedback to go down the "best optimization" path for the fast call.
+  // No optimization should be done before serialization, but after
+  // deserialization we need optimization to check the fast calls.
+  i::FLAG_always_opt = false;
+  i::FlagList::EnforceFlagImplications();
+  DisableEmbeddedBlobRefcounting();
+
+  v8::StartupData blob;
+  {
+    v8::SnapshotCreator creator(c_function_external_references);
+    v8::Isolate* isolate = creator.GetIsolate();
+    {
+      v8::HandleScope handle_scope(isolate);
+      v8::Local<v8::Context> context = v8::Context::New(isolate);
+      v8::Context::Scope context_scope(context);
+
+      v8::Local<v8::FunctionTemplate> callback = v8::FunctionTemplate::New(
+          isolate, FastApiReceiver::SlowCallback, v8::Local<v8::Value>(),
+          v8::Local<v8::Signature>(), 0, v8::ConstructorBehavior::kThrow,
+          v8::SideEffectType::kHasSideEffect,
+          &(FastApiReceiver::instance.c_function));
+
+      v8::Local<v8::ObjectTemplate> object_template =
+          v8::ObjectTemplate::New(isolate);
+      object_template->SetInternalFieldCount(1);
+      object_template->Set(isolate, "api_func", callback);
+
+      v8::Local<v8::Object> object =
+          object_template->NewInstance(context).ToLocalChecked();
+      object->SetAlignedPointerInInternalField(0, &(FastApiReceiver::instance));
+      CHECK(context->Global()
+                ->Set(context, v8_str("receiver"), object)
+                .FromJust());
+
+      CHECK(!FastApiReceiver::instance.DidCallFast());
+      CHECK(!FastApiReceiver::instance.DidCallSlow());
+
+      CompileRun("receiver.api_func();");
+      CHECK(FastApiReceiver::instance.DidCallSlow());
+
+      creator.SetDefaultContext(
+          context, v8::SerializeInternalFieldsCallback(
+                       FastApiReceiver::SerializeInternalFields, nullptr));
+    }
+    blob =
+        creator.CreateBlob(v8::SnapshotCreator::FunctionCodeHandling::kClear);
+  }
+
+  {
+    v8::Isolate::CreateParams params;
+    params.snapshot_blob = &blob;
+    params.array_buffer_allocator = CcTest::array_buffer_allocator();
+    params.external_references = c_function_external_references;
+
+    // Test-appropriate equivalent of v8::Isolate::New.
+    v8::Isolate* isolate = TestSerializer::NewIsolate(params);
+    {
+      v8::Isolate::Scope isolate_scope(isolate);
+      v8::HandleScope handle_scope(isolate);
+      v8::Local<v8::Context> context = v8::Context::New(
+          isolate, nullptr, v8::MaybeLocal<v8::ObjectTemplate>(),
+          v8::MaybeLocal<v8::Value>(),
+          v8::DeserializeInternalFieldsCallback(
+              FastApiReceiver::DeserializeInternalFields, nullptr));
+      v8::Context::Scope context_scope(context);
+
+      // Deserialize callback should reset the state of the instance.
+      CHECK(!FastApiReceiver::instance.DidCallFast());
+      CHECK(!FastApiReceiver::instance.DidCallSlow());
+      CompileRun(
+          "function foo(arg) {"
+          "  for (let i = 0; i < arg; ++i) { receiver.api_func(); }"
+          "}"
+          "%PrepareFunctionForOptimization(foo);"
+          "foo(42); foo(42);"
+          "%OptimizeFunctionOnNextCall(foo);"
+          "foo(42);");
+      CHECK(FastApiReceiver::instance.DidCallFast());
+    }
+    isolate->Dispose();
+  }
+  delete[] blob.data;
+  FreeCurrentEmbeddedBlob();
+#endif
+}
+
 v8::StartupData CreateSnapshotWithDefaultAndCustom() {
   v8::SnapshotCreator creator(original_external_references);
   v8::Isolate* isolate = creator.GetIsolate();