Sharing of SharedArrayBuffer via PostMessage transfer

Source/core/dom/DOMSharedArrayBuffer.cpp

Index: Source/core/dom/DOMSharedArrayBuffer.cpp
diff --git a/Source/core/dom/DOMArrayBuffer.cpp b/Source/core/dom/DOMSharedArrayBuffer.cpp
similarity index 70%
copy from Source/core/dom/DOMArrayBuffer.cpp
copy to Source/core/dom/DOMSharedArrayBuffer.cpp
index 41fdae243981748fd6fc8390497f5bd824fe493a..419d76e6e6b32da62be592dade0646eb707d9ecb 100644
--- a/Source/core/dom/DOMArrayBuffer.cpp
+++ b/Source/core/dom/DOMSharedArrayBuffer.cpp
@@ -3,7 +3,7 @@
 // found in the LICENSE file.
 
 #include "config.h"
-#include "core/dom/DOMArrayBuffer.h"
+#include "core/dom/DOMSharedArrayBuffer.h"
 
 #include "bindings/core/v8/DOMDataStore.h"
 #include "bindings/core/v8/V8DOMWrapper.h"
@@ -11,28 +11,29 @@
 
 namespace blink {
 
-v8::Local<v8::Object> DOMArrayBuffer::wrap(v8::Isolate* isolate, v8::Local<v8::Object> creationContext)
+v8::Local<v8::Object> DOMSharedArrayBuffer::wrap(v8::Isolate* isolate, v8::Local<v8::Object> creationContext)
 {
     // It's possible that no one except for the new wrapper owns this object at
     // this moment, so we have to prevent GC to collect this object until the
     // object gets associated with the wrapper.
-    RefPtr<DOMArrayBuffer> protect(this);
+    RefPtr<DOMSharedArrayBuffer> protect(this);
 
     ASSERT(!DOMDataStore::containsWrapper(this, isolate));
 
     const WrapperTypeInfo* wrapperTypeInfo = this->wrapperTypeInfo();
-    v8::Local<v8::Object> wrapper = v8::ArrayBuffer::New(isolate, data(), byteLength());
+    v8::Local<v8::Object> wrapper = v8::SharedArrayBuffer::New(isolate, data(), byteLength());
 
     // Only when we create a new wrapper, let V8 know that we allocated and
     // associated a new memory block with the wrapper. Note that
     // setDeallocationObserver implicitly calls
     // DOMArrayBufferDeallocationObserver::blinkAllocatedMemory.
+    // TODO(binji): Should this be a different observer? Perhaps we want to track shared memory separately.

[haraken, 2015/06/11 05:59:29]

Help me understand: Can the shared buffer be shared between isolates? If yes, we
should have a different deallocation observer for shared buffers. If no, we can
just use the same deallocation observer.

     buffer()->setDeallocationObserver(DOMArrayBufferDeallocationObserver::instance());
 
     return associateWithWrapper(isolate, wrapperTypeInfo, wrapper);
 }
 
-v8::Local<v8::Object> DOMArrayBuffer::associateWithWrapper(v8::Isolate* isolate, const WrapperTypeInfo* wrapperTypeInfo, v8::Local<v8::Object> wrapper)
+v8::Local<v8::Object> DOMSharedArrayBuffer::associateWithWrapper(v8::Isolate* isolate, const WrapperTypeInfo* wrapperTypeInfo, v8::Local<v8::Object> wrapper)
 {
     // This function does not set a deallocation observer to the underlying
     // array buffer.  It's a caller's duty.