add SharedArrayBuffer deprecated constructor (#171)

needed temporarily for porting deno

src/binding.cc

@@ -993,6 +993,14 @@ v8::SharedArrayBuffer* v8__SharedArrayBuffer__New(v8::Isolate* isolate,
   return local_to_ptr(v8::SharedArrayBuffer::New(isolate, byte_length));
 }
 
+v8::SharedArrayBuffer* v8__SharedArrayBuffer__New__DEPRECATED(
+    v8::Isolate* isolate, void* data_ptr, size_t data_length) {
+  auto ab =
+      v8::SharedArrayBuffer::New(isolate, data_ptr, data_length,
+                                 v8::ArrayBufferCreationMode::kExternalized);
+  return local_to_ptr(ab);
+}
+
 size_t v8__SharedArrayBuffer__ByteLength(v8::SharedArrayBuffer& self) {
   return self.ByteLength();
 }

src/shared_array_buffer.rs

@@ -10,6 +10,11 @@ extern "C" {
     isolate: *mut Isolate,
     byte_length: usize,
   ) -> *mut SharedArrayBuffer;
+  fn v8__SharedArrayBuffer__New__DEPRECATED(
+    isolate: *mut Isolate,
+    data_ptr: *mut std::ffi::c_void,
+    data_length: usize,
+  ) -> *mut SharedArrayBuffer;
   fn v8__SharedArrayBuffer__ByteLength(
     self_: *const SharedArrayBuffer,
   ) -> usize;
@@ -32,6 +37,29 @@ impl SharedArrayBuffer {
     }
   }
 
+  /// DEPRECATED
+  /// Use the version that takes a BackingStore.
+  /// See http://crbug.com/v8/9908.
+  ///
+  ///
+  /// Create a new SharedArrayBuffer over an existing memory block.  The created
+  /// array buffer is immediately in externalized state unless otherwise
+  /// specified. The memory block will not be reclaimed when a created
+  /// SharedArrayBuffer is garbage-collected.
+  #[allow(non_snake_case)]
+  pub unsafe fn new_DEPRECATED<'sc>(
+    scope: &mut impl ToLocal<'sc>,
+    data_ptr: *mut std::ffi::c_void,
+    data_length: usize,
+  ) -> Local<'sc, SharedArrayBuffer> {
+    Local::from_raw(v8__SharedArrayBuffer__New__DEPRECATED(
+      scope.isolate(),
+      data_ptr,
+      data_length,
+    ))
+    .unwrap()
+  }
+
   /// Data length in bytes.
   pub fn byte_length(&self) -> usize {
     unsafe { v8__SharedArrayBuffer__ByteLength(self) }