src: replace NoArrayBufferZeroFillScope with v8 option

NoArrayBufferZeroFillScope was added before the v8 option to
create uninitialized backing stores was added. We can start
moving away from it.

Author: jasnell

src/encoding_binding.cc

@@ -15,6 +15,7 @@ namespace encoding_binding {
 
 using v8::ArrayBuffer;
 using v8::BackingStore;
+using v8::BackingStoreInitializationMode;
 using v8::Context;
 using v8::FunctionCallbackInfo;
 using v8::Isolate;
@@ -124,9 +125,8 @@ void BindingData::EncodeUtf8String(const FunctionCallbackInfo<Value>& args) {
 
   Local<ArrayBuffer> ab;
   {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    std::unique_ptr<BackingStore> bs =
-        ArrayBuffer::NewBackingStore(isolate, length);
+    std::unique_ptr<BackingStore> bs = ArrayBuffer::NewBackingStore(
+        isolate, length, BackingStoreInitializationMode::kUninitialized);
 
     CHECK(bs);
 

src/env.cc

@@ -39,6 +39,9 @@ namespace node {
 
 using errors::TryCatchScope;
 using v8::Array;
+using v8::ArrayBuffer;
+using v8::BackingStore;
+using v8::BackingStoreInitializationMode;
 using v8::Boolean;
 using v8::Context;
 using v8::CppHeap;
@@ -742,17 +745,18 @@ void Environment::add_refs(int64_t diff) {
 }
 
 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);
+  std::unique_ptr<BackingStore> bs = ArrayBuffer::NewBackingStore(
+      isolate(),
+      suggested_size,
+      BackingStoreInitializationMode::kUninitialized);
   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;
 }
 
-std::unique_ptr<v8::BackingStore> Environment::release_managed_buffer(
+std::unique_ptr<BackingStore> Environment::release_managed_buffer(
     const uv_buf_t& buf) {
-  std::unique_ptr<v8::BackingStore> bs;
+  std::unique_ptr<BackingStore> bs;
   if (buf.base != nullptr) {
     auto it = released_allocated_buffers_.find(buf.base);
     CHECK_NE(it, released_allocated_buffers_.end());

src/node_buffer.cc

@@ -58,6 +58,7 @@ namespace Buffer {
 using v8::ArrayBuffer;
 using v8::ArrayBufferView;
 using v8::BackingStore;
+using v8::BackingStoreInitializationMode;
 using v8::Context;
 using v8::EscapableHandleScope;
 using v8::FastApiTypedArray;
@@ -372,9 +373,8 @@ MaybeLocal<Object> New(Environment* env, size_t length) {
 
   Local<ArrayBuffer> ab;
   {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    std::unique_ptr<BackingStore> bs =
-        ArrayBuffer::NewBackingStore(isolate, length);
+    std::unique_ptr<BackingStore> bs = ArrayBuffer::NewBackingStore(
+        isolate, length, BackingStoreInitializationMode::kUninitialized);
 
     CHECK(bs);
 
@@ -413,18 +413,14 @@ MaybeLocal<Object> Copy(Environment* env, const char* data, size_t length) {
     return Local<Object>();
   }
 
-  Local<ArrayBuffer> ab;
-  {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    std::unique_ptr<BackingStore> bs =
-        ArrayBuffer::NewBackingStore(isolate, length);
+  std::unique_ptr<BackingStore> bs = ArrayBuffer::NewBackingStore(
+      isolate, length, BackingStoreInitializationMode::kUninitialized);
 
-    CHECK(bs);
+  CHECK(bs);
 
-    memcpy(bs->Data(), data, length);
+  memcpy(bs->Data(), data, length);
 
-    ab = ArrayBuffer::New(isolate, std::move(bs));
-  }
+  Local<ArrayBuffer> ab = ArrayBuffer::New(isolate, std::move(bs));
 
   MaybeLocal<Object> obj =
       New(env, ab, 0, ab->ByteLength())

src/node_http2.cc

@@ -27,6 +27,7 @@ using v8::Array;
 using v8::ArrayBuffer;
 using v8::ArrayBufferView;
 using v8::BackingStore;
+using v8::BackingStoreInitializationMode;
 using v8::Boolean;
 using v8::Context;
 using v8::EscapableHandleScope;
@@ -292,11 +293,10 @@ Local<Value> Http2Settings::Pack(
     size_t count,
     const nghttp2_settings_entry* entries) {
   EscapableHandleScope scope(env->isolate());
-  std::unique_ptr<BackingStore> bs;
-  {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    bs = ArrayBuffer::NewBackingStore(env->isolate(), count * 6);
-  }
+  std::unique_ptr<BackingStore> bs = ArrayBuffer::NewBackingStore(
+      env->isolate(),
+      count * 6,
+      BackingStoreInitializationMode::kUninitialized);
   if (nghttp2_pack_settings_payload(static_cast<uint8_t*>(bs->Data()),
                                     bs->ByteLength(),
                                     entries,
@@ -457,13 +457,11 @@ Origins::Origins(
     return;
   }
 
-  {
-    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);
-  }
+  bs_ = ArrayBuffer::NewBackingStore(
+      env->isolate(),
+      alignof(nghttp2_origin_entry) - 1 +
+          count_ * sizeof(nghttp2_origin_entry) + origin_string_len,
+      BackingStoreInitializationMode::kUninitialized);
 
   // Make sure the start address is aligned appropriately for an nghttp2_nv*.
   char* start = nbytes::AlignUp(static_cast<char*>(bs_->Data()),
@@ -2064,12 +2062,10 @@ void Http2Session::OnStreamRead(ssize_t nread, const uv_buf_t& buf_) {
     // 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_;
-    std::unique_ptr<BackingStore> new_bs;
-    {
-      NoArrayBufferZeroFillScope no_zero_fill_scope(env()->isolate_data());
-      new_bs = ArrayBuffer::NewBackingStore(env()->isolate(),
-                                            pending_len + nread);
-    }
+    std::unique_ptr<BackingStore> new_bs = ArrayBuffer::NewBackingStore(
+        env()->isolate(),
+        pending_len + nread,
+        BackingStoreInitializationMode::kUninitialized);
     memcpy(static_cast<char*>(new_bs->Data()),
            stream_buf_.base + stream_buf_offset_,
            pending_len);

src/stream_base.cc

@@ -19,6 +19,7 @@ namespace node {
 using v8::Array;
 using v8::ArrayBuffer;
 using v8::BackingStore;
+using v8::BackingStoreInitializationMode;
 using v8::ConstructorBehavior;
 using v8::Context;
 using v8::DontDelete;
@@ -243,8 +244,8 @@ int StreamBase::Writev(const FunctionCallbackInfo<Value>& args) {
 
   std::unique_ptr<BackingStore> bs;
   if (storage_size > 0) {
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    bs = ArrayBuffer::NewBackingStore(isolate, storage_size);
+    bs = ArrayBuffer::NewBackingStore(
+        isolate, storage_size, BackingStoreInitializationMode::kUninitialized);
   }
 
   offset = 0;
@@ -398,14 +399,14 @@ int StreamBase::WriteString(const FunctionCallbackInfo<Value>& args) {
 
   if (try_write) {
     // Copy partial data
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    bs = ArrayBuffer::NewBackingStore(isolate, buf.len);
+    bs = ArrayBuffer::NewBackingStore(
+        isolate, buf.len, BackingStoreInitializationMode::kUninitialized);
     memcpy(static_cast<char*>(bs->Data()), buf.base, buf.len);
     data_size = buf.len;
   } else {
     // Write it
-    NoArrayBufferZeroFillScope no_zero_fill_scope(env->isolate_data());
-    bs = ArrayBuffer::NewBackingStore(isolate, storage_size);
+    bs = ArrayBuffer::NewBackingStore(
+        isolate, storage_size, BackingStoreInitializationMode::kUninitialized);
     data_size = StringBytes::Write(isolate,
                                    static_cast<char*>(bs->Data()),
                                    storage_size,