src: remove usage of AllocatedBuffer from udp_wrap.cc

Signed-off-by: Darshan Sen <darshan.sen@postman.com>

PR-URL: https://github.com/nodejs/node/pull/40151
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

src/env-inl.h

@@ -25,6 +25,7 @@
 #if defined(NODE_WANT_INTERNALS) && NODE_WANT_INTERNALS
 
 #include "aliased_buffer.h"
+#include "allocated_buffer-inl.h"
 #include "callback_queue-inl.h"
 #include "env.h"
 #include "node.h"
@@ -971,6 +972,29 @@ inline IsolateData* Environment::isolate_data() const {
   return isolate_data_;
 }
 
+inline uv_buf_t Environment::allocate_managed_buffer(
+    const size_t suggested_size) {
+  NoArrayBufferZeroFillScope no_zero_fill_scope(isolate_data());
+  std::unique_ptr<v8::BackingStore> bs =
+      v8::ArrayBuffer::NewBackingStore(isolate(), suggested_size);
+  uv_buf_t buf = uv_buf_init(static_cast<char*>(bs->Data()), bs->ByteLength());
+  released_allocated_buffers()->emplace(buf.base, std::move(bs));
+  return buf;
+}
+
+inline std::unique_ptr<v8::BackingStore> Environment::release_managed_buffer(
+    const uv_buf_t& buf) {
+  std::unique_ptr<v8::BackingStore> bs;
+  if (buf.base != nullptr) {
+    auto map = released_allocated_buffers();
+    auto it = map->find(buf.base);
+    CHECK_NE(it, map->end());
+    bs = std::move(it->second);
+    map->erase(it);
+  }
+  return bs;
+}
+
 std::unordered_map<char*, std::unique_ptr<v8::BackingStore>>*
     Environment::released_allocated_buffers() {
   return &released_allocated_buffers_;

src/env.h

@@ -1438,6 +1438,9 @@ class Environment : public MemoryRetainer {
   void RunAndClearNativeImmediates(bool only_refed = false);
   void RunAndClearInterrupts();
 
+  inline uv_buf_t allocate_managed_buffer(const size_t suggested_size);
+  inline std::unique_ptr<v8::BackingStore> release_managed_buffer(
+      const uv_buf_t& buf);
   inline std::unordered_map<char*, std::unique_ptr<v8::BackingStore>>*
       released_allocated_buffers();
 

src/udp_wrap.cc

@@ -31,12 +31,16 @@
 namespace node {
 
 using v8::Array;
+using v8::ArrayBuffer;
+using v8::BackingStore;
+using v8::Boolean;
 using v8::Context;
 using v8::DontDelete;
 using v8::FunctionCallbackInfo;
 using v8::FunctionTemplate;
 using v8::HandleScope;
 using v8::Integer;
+using v8::Isolate;
 using v8::Local;
 using v8::MaybeLocal;
 using v8::Object;
@@ -314,7 +318,7 @@ void UDPWrap::BufferSize(const FunctionCallbackInfo<Value>& args) {
 
   CHECK(args[0]->IsUint32());
   CHECK(args[1]->IsBoolean());
-  bool is_recv = args[1].As<v8::Boolean>()->Value();
+  bool is_recv = args[1].As<Boolean>()->Value();
   const char* uv_func_name = is_recv ? "uv_recv_buffer_size" :
                                        "uv_send_buffer_size";
 
@@ -679,7 +683,7 @@ void UDPWrap::OnAlloc(uv_handle_t* handle,
 }
 
 uv_buf_t UDPWrap::OnAlloc(size_t suggested_size) {
-  return AllocatedBuffer::AllocateManaged(env(), suggested_size).release();
+  return env()->allocate_managed_buffer(suggested_size);
 }
 
 void UDPWrap::OnRecv(uv_udp_t* handle,
@@ -696,27 +700,32 @@ void UDPWrap::OnRecv(ssize_t nread,
                      const sockaddr* addr,
                      unsigned int flags) {
   Environment* env = this->env();
-  AllocatedBuffer buf(env, buf_);
+  Isolate* isolate = env->isolate();
+  std::unique_ptr<BackingStore> bs = env->release_managed_buffer(buf_);
   if (nread == 0 && addr == nullptr) {
     return;
   }
 
-  HandleScope handle_scope(env->isolate());
+  HandleScope handle_scope(isolate);
   Context::Scope context_scope(env->context());
 
   Local<Value> argv[] = {
-      Integer::New(env->isolate(), static_cast<int32_t>(nread)),
+      Integer::New(isolate, static_cast<int32_t>(nread)),
       object(),
-      Undefined(env->isolate()),
-      Undefined(env->isolate())};
+      Undefined(isolate),
+      Undefined(isolate)};
 
   if (nread < 0) {
     MakeCallback(env->onmessage_string(), arraysize(argv), argv);
     return;
+  } else if (nread == 0) {
+    bs = ArrayBuffer::NewBackingStore(isolate, 0);
+  } else {
+    bs = BackingStore::Reallocate(isolate, std::move(bs), nread);
   }
 
-  buf.Resize(nread);
-  argv[2] = buf.ToBuffer().ToLocalChecked();
+  Local<ArrayBuffer> ab = ArrayBuffer::New(isolate, std::move(bs));
+  argv[2] = Buffer::New(env, ab, 0, ab->ByteLength()).ToLocalChecked();
   argv[3] = AddressToJS(env, addr);
   MakeCallback(env->onmessage_string(), arraysize(argv), argv);
 }