src: remove usage of AllocatedBuffer from node_http2

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

PR-URL: https://github.com/nodejs/node/pull/40584
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>

src/node_http2.cc

@@ -21,9 +21,11 @@ namespace node {
 using v8::Array;
 using v8::ArrayBuffer;
 using v8::ArrayBufferView;
+using v8::BackingStore;
 using v8::Boolean;
 using v8::Context;
 using v8::EscapableHandleScope;
+using v8::False;
 using v8::Function;
 using v8::FunctionCallbackInfo;
 using v8::FunctionTemplate;
@@ -37,6 +39,7 @@ using v8::Number;
 using v8::Object;
 using v8::ObjectTemplate;
 using v8::String;
+using v8::True;
 using v8::Uint8Array;
 using v8::Undefined;
 using v8::Value;
@@ -267,17 +270,20 @@ Local<Value> Http2Settings::Pack(
     size_t count,
     const nghttp2_settings_entry* entries) {
   EscapableHandleScope scope(env->isolate());
-  const size_t size = count * 6;
-  AllocatedBuffer buffer = AllocatedBuffer::AllocateManaged(env, size);
-  ssize_t ret =
-      nghttp2_pack_settings_payload(
-          reinterpret_cast<uint8_t*>(buffer.data()),
-          size,
-          entries,
-          count);
-  Local<Value> buf = Undefined(env->isolate());
-  if (ret >= 0) buf = buffer.ToBuffer().ToLocalChecked();
-  return scope.Escape(buf);
+  std::unique_ptr<BackingStore> bs;
+  {
+    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
+    bs = ArrayBuffer::NewBackingStore(env->isolate(), count * 6);
+  }
+  if (nghttp2_pack_settings_payload(static_cast<uint8_t*>(bs->Data()),
+                                    bs->ByteLength(),
+                                    entries,
+                                    count) < 0) {
+    return scope.Escape(Undefined(env->isolate()));
+  }
+  Local<ArrayBuffer> ab = ArrayBuffer::New(env->isolate(), std::move(bs));
+  return scope.Escape(Buffer::New(env, ab, 0, ab->ByteLength())
+                          .FromMaybe(Local<Value>()));
 }
 
 // Updates the shared TypedArray with the current remote or local settings for
@@ -323,7 +329,7 @@ void Http2Settings::Done(bool ack) {
   double duration = (end - startTime_) / 1e6;
 
   Local<Value> argv[] = {
-    ack ? v8::True(env()->isolate()) : v8::False(env()->isolate()),
+    ack ? True(env()->isolate()) : False(env()->isolate()),
     Number::New(env()->isolate(), duration)
   };
   MakeCallback(callback(), arraysize(argv), argv);
@@ -368,19 +374,23 @@ Origins::Origins(
     return;
   }
 
-  buf_ = AllocatedBuffer::AllocateManaged(
-      env,
-      (alignof(nghttp2_origin_entry) - 1) +
-       count_ * sizeof(nghttp2_origin_entry) +
-                              origin_string_len);
+  {
+    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
+    bs_ = ArrayBuffer::NewBackingStore(env->isolate(),
+                                       alignof(nghttp2_origin_entry) - 1 +
+                                       count_ * sizeof(nghttp2_origin_entry) +
+                                       origin_string_len);
+  }
 
   // Make sure the start address is aligned appropriately for an nghttp2_nv*.
-  char* start = AlignUp(buf_.data(), alignof(nghttp2_origin_entry));
+  char* start = AlignUp(static_cast<char*>(bs_->Data()),
+                        alignof(nghttp2_origin_entry));
   char* origin_contents = start + (count_ * sizeof(nghttp2_origin_entry));
   nghttp2_origin_entry* const nva =
       reinterpret_cast<nghttp2_origin_entry*>(start);
 
-  CHECK_LE(origin_contents + origin_string_len, buf_.data() + buf_.size());
+  CHECK_LE(origin_contents + origin_string_len,
+           static_cast<char*>(bs_->Data()) + bs_->ByteLength());
   CHECK_EQ(origin_string->WriteOneByte(
                env->isolate(),
                reinterpret_cast<uint8_t*>(origin_contents),
@@ -819,7 +829,7 @@ void Http2Session::ConsumeHTTP2Data() {
   DecrementCurrentSessionMemory(stream_buf_.len);
   stream_buf_offset_ = 0;
   stream_buf_ab_.Reset();
-  stream_buf_allocation_.clear();
+  stream_buf_allocation_.reset();
   stream_buf_ = uv_buf_init(nullptr, 0);
 
   // Send any data that was queued up while processing the received data.
@@ -1247,7 +1257,8 @@ void Http2StreamListener::OnStreamRead(ssize_t nread, const uv_buf_t& buf) {
 
   Local<ArrayBuffer> ab;
   if (session->stream_buf_ab_.IsEmpty()) {
-    ab = session->stream_buf_allocation_.ToArrayBuffer();
+    ab = ArrayBuffer::New(env->isolate(),
+                          std::move(session->stream_buf_allocation_));
     session->stream_buf_ab_.Reset(env->isolate(), ab);
   } else {
     ab = PersistentToLocal::Strong(session->stream_buf_ab_);
@@ -1823,7 +1834,7 @@ Http2Stream* Http2Session::SubmitRequest(
 }
 
 uv_buf_t Http2Session::OnStreamAlloc(size_t suggested_size) {
-  return AllocatedBuffer::AllocateManaged(env(), suggested_size).release();
+  return env()->allocate_managed_buffer(suggested_size);
 }
 
 // Callback used to receive inbound data from the i/o stream
@@ -1833,7 +1844,7 @@ void Http2Session::OnStreamRead(ssize_t nread, const uv_buf_t& buf_) {
   Http2Scope h2scope(this);
   CHECK_NOT_NULL(stream_);
   Debug(this, "receiving %d bytes, offset %d", nread, stream_buf_offset_);
-  AllocatedBuffer buf(env(), buf_);
+  std::unique_ptr<BackingStore> bs = env()->release_managed_buffer(buf_);
 
   // Only pass data on if nread > 0
   if (nread <= 0) {
@@ -1843,24 +1854,34 @@ void Http2Session::OnStreamRead(ssize_t nread, const uv_buf_t& buf_) {
     return;
   }
 
+  CHECK_LE(static_cast<size_t>(nread), bs->ByteLength());
+
   statistics_.data_received += nread;
 
   if (LIKELY(stream_buf_offset_ == 0)) {
     // Shrink to the actual amount of used data.
-    buf.Resize(nread);
+    bs = BackingStore::Reallocate(env()->isolate(), std::move(bs), nread);
   } else {
     // This is a very unlikely case, and should only happen if the ReadStart()
     // call in OnStreamAfterWrite() immediately provides data. If that does
     // happen, we concatenate the data we received with the already-stored
     // pending input data, slicing off the already processed part.
     size_t pending_len = stream_buf_.len - stream_buf_offset_;
-    AllocatedBuffer new_buf =
-        AllocatedBuffer::AllocateManaged(env(), pending_len + nread);
-    memcpy(new_buf.data(), stream_buf_.base + stream_buf_offset_, pending_len);
-    memcpy(new_buf.data() + pending_len, buf.data(), nread);
+    std::unique_ptr<BackingStore> new_bs;
+    {
+      NoArrayBufferZeroFillScope no_zero_fill_scope(env()->isolate_data());
+      new_bs = ArrayBuffer::NewBackingStore(env()->isolate(),
+                                            pending_len + nread);
+    }
+    memcpy(static_cast<char*>(new_bs->Data()),
+           stream_buf_.base + stream_buf_offset_,
+           pending_len);
+    memcpy(static_cast<char*>(new_bs->Data()) + pending_len,
+           bs->Data(),
+           nread);
 
-    buf = std::move(new_buf);
-    nread = buf.size();
+    bs = std::move(new_bs);
+    nread = bs->ByteLength();
     stream_buf_offset_ = 0;
     stream_buf_ab_.Reset();
 
@@ -1873,12 +1894,13 @@ void Http2Session::OnStreamRead(ssize_t nread, const uv_buf_t& buf_) {
 
   // Remember the current buffer, so that OnDataChunkReceived knows the
   // offset of a DATA frame's data into the socket read buffer.
-  stream_buf_ = uv_buf_init(buf.data(), static_cast<unsigned int>(nread));
+  stream_buf_ = uv_buf_init(static_cast<char*>(bs->Data()),
+                            static_cast<unsigned int>(nread));
 
   // Store this so we can create an ArrayBuffer for read data from it.
   // DATA frames will be emitted as slices of that ArrayBuffer to avoid having
   // to copy memory.
-  stream_buf_allocation_ = std::move(buf);
+  stream_buf_allocation_ = std::move(bs);
 
   ConsumeHTTP2Data();
 
@@ -2023,7 +2045,7 @@ void Http2Stream::Close(int32_t code) {
   Debug(this, "closed with code %d", code);
 }
 
-ShutdownWrap* Http2Stream::CreateShutdownWrap(v8::Local<v8::Object> object) {
+ShutdownWrap* Http2Stream::CreateShutdownWrap(Local<Object> object) {
   // DoShutdown() always finishes synchronously, so there's no need to create
   // a structure to store asynchronous context.
   return nullptr;
@@ -3049,7 +3071,7 @@ void Http2Ping::Done(bool ack, const uint8_t* payload) {
   }
 
   Local<Value> argv[] = {
-    ack ? v8::True(isolate) : v8::False(isolate),
+    ack ? True(isolate) : False(isolate),
     Number::New(isolate, duration_ms),
     buf
   };

src/node_http2.h

@@ -8,7 +8,6 @@
 #include "nghttp2/nghttp2.h"
 
 #include "env.h"
-#include "allocated_buffer.h"
 #include "aliased_struct.h"
 #include "node_http2_state.h"
 #include "node_http_common.h"
@@ -897,7 +896,7 @@ class Http2Session : public AsyncWrap,
   // When processing input data, either stream_buf_ab_ or stream_buf_allocation_
   // will be set. stream_buf_ab_ is lazily created from stream_buf_allocation_.
   v8::Global<v8::ArrayBuffer> stream_buf_ab_;
-  AllocatedBuffer stream_buf_allocation_;
+  std::unique_ptr<v8::BackingStore> stream_buf_allocation_;
   size_t stream_buf_offset_ = 0;
   // Custom error code for errors that originated inside one of the callbacks
   // called by nghttp2_session_mem_recv.
@@ -1040,7 +1039,7 @@ class Origins {
   ~Origins() = default;
 
   const nghttp2_origin_entry* operator*() const {
-    return reinterpret_cast<const nghttp2_origin_entry*>(buf_.data());
+    return static_cast<const nghttp2_origin_entry*>(bs_->Data());
   }
 
   size_t length() const {
@@ -1049,7 +1048,7 @@ class Origins {
 
  private:
   size_t count_;
-  AllocatedBuffer buf_;
+  std::unique_ptr<v8::BackingStore> bs_;
 };
 
 #define HTTP2_HIDDEN_CONSTANTS(V)                                              \