Sharing of SharedArrayBuffer via PostMessage transfer

Source/bindings/core/v8/SerializedScriptValue.cpp

 /*
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 21 matching lines @@
 #include "bindings/core/v8/SerializedScriptValue.h"
 
 #include "bindings/core/v8/DOMDataStore.h"
 #include "bindings/core/v8/DOMWrapperWorld.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptState.h"
 #include "bindings/core/v8/ScriptValueSerializer.h"
 #include "bindings/core/v8/SerializedScriptValueFactory.h"
 #include "bindings/core/v8/V8ArrayBuffer.h"
 #include "bindings/core/v8/V8MessagePort.h"
+#include "bindings/core/v8/V8SharedArrayBuffer.h"
 #include "core/dom/ExceptionCode.h"
 #include "platform/SharedBuffer.h"
 #include "platform/blob/BlobData.h"
 #include "platform/heap/Handle.h"
 #include "wtf/Assertions.h"
 #include "wtf/ByteOrder.h"
 #include "wtf/Vector.h"
 #include "wtf/text/StringBuffer.h"
 #include "wtf/text/StringHash.h"
 
@@ skipping 41 matching lines @@
             if (!wrapper.IsEmpty())
                 buffers.append(v8::Local<v8::ArrayBuffer>::Cast(wrapper));
         }
     } else {
         v8::Local<v8::Object> wrapper = DOMWrapperWorld::current(isolate).domDataStore().get(object, isolate);
         if (!wrapper.IsEmpty())
             buffers.append(v8::Local<v8::ArrayBuffer>::Cast(wrapper));
     }
 }
 
-PassOwnPtr<SerializedScriptValue::ArrayBufferContentsArray> SerializedScriptValue::createArrayBuffers(v8::Isolate* isolate, ArrayBufferArray& arrayBuffers, ExceptionState& exceptionState)
+PassOwnPtr<SerializedScriptValue::ArrayBufferContentsArray> SerializedScriptValue::createArrayBuffers(v8::Isolate* isolate, ArrayBufferArray& arrayBuffers, SharedArrayBufferArray& sharedArrayBuffers, ExceptionState& exceptionState)
 {
-    ASSERT(arrayBuffers.size());
+    size_t bufferCount = arrayBuffers.size() + sharedArrayBuffers.size();
+    ASSERT(bufferCount > 0);
 
     for (size_t i = 0; i < arrayBuffers.size(); i++) {
         if (arrayBuffers[i]->isNeutered()) {
             exceptionState.throwDOMException(DataCloneError, "ArrayBuffer at index " + String::number(i) + " is already neutered.");
             return nullptr;
         }
     }
 
-    OwnPtr<ArrayBufferContentsArray> contents = adoptPtr(new ArrayBufferContentsArray(arrayBuffers.size()));
+    OwnPtr<ArrayBufferContentsArray> contents = adoptPtr(new ArrayBufferContentsArray(bufferCount));
 
     HashSet<DOMArrayBuffer*> visited;
     for (size_t i = 0; i < arrayBuffers.size(); i++) {
         if (visited.contains(arrayBuffers[i].get()))
             continue;
         visited.add(arrayBuffers[i].get());
 
         Vector<v8::Local<v8::ArrayBuffer>, 4> bufferHandles;
         v8::HandleScope handleScope(isolate);
         acculumateArrayBuffersForAllWorlds(isolate, arrayBuffers[i].get(), bufferHandles);
         bool isNeuterable = true;
         for (size_t j = 0; j < bufferHandles.size(); j++)
             isNeuterable &= bufferHandles[j]->IsNeuterable();
 
         RefPtr<DOMArrayBuffer> toTransfer = arrayBuffers[i];
         if (!isNeuterable)
             toTransfer = DOMArrayBuffer::create(arrayBuffers[i]->buffer());
         bool result = toTransfer->transfer(contents->at(i));
         if (!result) {
             exceptionState.throwDOMException(DataCloneError, "ArrayBuffer at index " + String::number(i) + " could not be transferred.");
             return nullptr;
         }
 
         if (isNeuterable)
             for (size_t j = 0; j < bufferHandles.size(); j++)
                 bufferHandles[j]->Neuter();
     }
+
+    HashSet<DOMSharedArrayBuffer*> sharedVisited;
+    size_t offset = arrayBuffers.size();
+    for (size_t i = 0; i < sharedArrayBuffers.size(); i++) {
+        if (sharedVisited.contains(sharedArrayBuffers[i].get()))
+            continue;
+        sharedVisited.add(sharedArrayBuffers[i].get());
+
+        bool result = sharedArrayBuffers[i]->transfer(contents->at(i + offset));
+        if (!result) {
+            exceptionState.throwDOMException(DataCloneError, "SharedArrayBuffer at index " + String::number(i) + " could not be transferred.");
+            return nullptr;
+        }
+    }
+
     return contents.release();
 }
 
 SerializedScriptValue::SerializedScriptValue(const String& wireData)
     : m_externallyAllocatedMemory(0)
 {
     m_data = wireData.isolatedCopy();
 }
 
 v8::Local<v8::Value> SerializedScriptValue::deserialize(MessagePortArray* messagePorts)
 {
     return deserialize(v8::Isolate::GetCurrent(), messagePorts, 0);
 }
 
 v8::Local<v8::Value> SerializedScriptValue::deserialize(v8::Isolate* isolate, MessagePortArray* messagePorts, const WebBlobInfoArray* blobInfo)
 {
     return SerializedScriptValueFactory::instance().deserialize(this, isolate, messagePorts, blobInfo);
 }
 
-bool SerializedScriptValue::extractTransferables(v8::Isolate* isolate, v8::Local<v8::Value> value, int argumentIndex, MessagePortArray& ports, ArrayBufferArray& arrayBuffers, ExceptionState& exceptionState)
+bool SerializedScriptValue::extractTransferables(v8::Isolate* isolate, v8::Local<v8::Value> value, int argumentIndex, MessagePortArray& ports, ArrayBufferArray& arrayBuffers, SharedArrayBufferArray& sharedArrayBuffers, ExceptionState& exceptionState)
 {
     if (isUndefinedOrNull(value)) {
         ports.resize(0);
         arrayBuffers.resize(0);
+        sharedArrayBuffers.resize(0);
         return true;
     }
 
     uint32_t length = 0;
     if (value->IsArray()) {
         v8::Local<v8::Array> array = v8::Local<v8::Array>::Cast(value);
         length = array->Length();
     } else if (!toV8Sequence(value, length, isolate, exceptionState)) {
         if (!exceptionState.hadException())
             exceptionState.throwTypeError(ExceptionMessages::notAnArrayTypeArgumentOrValue(argumentIndex + 1));
@@ skipping 21 matching lines @@
                 return false;
             }
             ports.append(port.release());
         } else if (V8ArrayBuffer::hasInstance(transferrable, isolate)) {
             RefPtr<DOMArrayBuffer> arrayBuffer = V8ArrayBuffer::toImpl(v8::Local<v8::Object>::Cast(transferrable));
             if (arrayBuffers.contains(arrayBuffer)) {
                 exceptionState.throwDOMException(DataCloneError, "ArrayBuffer at index " + String::number(i) + " is a duplicate of an earlier ArrayBuffer.");
                 return false;
             }
             arrayBuffers.append(arrayBuffer.release());
+        } else if (V8SharedArrayBuffer::hasInstance(transferrable, isolate)) {
+            RefPtr<DOMSharedArrayBuffer> sharedArrayBuffer = V8SharedArrayBuffer::toImpl(v8::Handle<v8::Object>::Cast(transferrable));
+            if (sharedArrayBuffers.contains(sharedArrayBuffer)) {
+                exceptionState.throwDOMException(DataCloneError, "SharedArrayBuffer at index " + String::number(i) + " is a duplicate of an earlier SharedArrayBuffer.");
+                return false;
+            }
+            sharedArrayBuffers.append(sharedArrayBuffer.release());
         } else {
             exceptionState.throwTypeError("Value at index " + String::number(i) + " does not have a transferable type.");
             return false;
         }
     }
     return true;
 }
 
 void SerializedScriptValue::registerMemoryAllocatedWithCurrentScriptContext()
 {
     if (m_externallyAllocatedMemory)
         return;
     m_externallyAllocatedMemory = static_cast<intptr_t>(m_data.length());
     v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(m_externallyAllocatedMemory);
 }
 
 SerializedScriptValue::~SerializedScriptValue()
 {
     // If the allocated memory was not registered before, then this class is likely
     // used in a context other then Worker's onmessage environment and the presence of
     // current v8 context is not guaranteed. Avoid calling v8 then.
     if (m_externallyAllocatedMemory) {
         ASSERT(v8::Isolate::GetCurrent());
         v8::Isolate::GetCurrent()->AdjustAmountOfExternalAllocatedMemory(-m_externallyAllocatedMemory);
     }
 }
 
-void SerializedScriptValue::transferArrayBuffers(v8::Isolate* isolate, ArrayBufferArray& arrayBuffers, ExceptionState& exceptionState)
+void SerializedScriptValue::transferArrayBuffers(v8::Isolate* isolate, ArrayBufferArray& arrayBuffers, SharedArrayBufferArray& sharedArrayBuffers, ExceptionState& exceptionState)
 {
-    m_arrayBufferContentsArray = createArrayBuffers(isolate, arrayBuffers, exceptionState);
+    m_arrayBufferContentsArray = createArrayBuffers(isolate, arrayBuffers, sharedArrayBuffers, exceptionState);
 }
 
 } // namespace blink