Add V8 bindings for Worker (Part I).

webkit/port/bindings/v8/WorkerScriptController.cpp

+// Copyright (c) 2008, 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
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+//     * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+// 
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#if ENABLE(WORKERS)
+
+#include "config.h"
+#include "WorkerScriptController.h"
+
+#include "ScriptSourceCode.h"
+#include "ScriptValue.h"
+#include "v8_proxy.h"
+#include "WorkerContext.h"
+#include "WorkerMessagingProxy.h"
+#include "WorkerThread.h"
+
+namespace WebCore {
+
+WorkerScriptController::WorkerScriptController(WorkerContext* workerContext)
+    : m_workerContext(workerContext)
+    , m_executionForbidden(false)
+{
+}
+
+WorkerScriptController::~WorkerScriptController()
+{
+    Dispose();
+}
+
+void WorkerScriptController::Dispose()
+{
+    if (!m_context.IsEmpty()) {
+        m_context.Dispose();
+        m_context.Clear();
+    }
+}
+
+void WorkerScriptController::InitContextIfNeeded()
+{
+    // Bail out if the context has already been initialized.
+    if (!m_context.IsEmpty())
+        return;
+
+    // Create a new environment
+    v8::Persistent<v8::ObjectTemplate> global_template;
+    m_context = v8::Context::New(NULL, global_template);
+        
+    // TODO (jianli): to initialize the context.
+}
+
+ScriptValue WorkerScriptController::evaluate(const ScriptSourceCode& sourceCode)
+{
+    {
+        MutexLocker lock(m_sharedDataMutex);
+        if (m_executionForbidden)
+            return ScriptValue();
+    }
+
+    v8::Local<v8::Value> result;
+    {
+        v8::Locker locker;
+        v8::HandleScope hs;
+
+        InitContextIfNeeded();
+        v8::Context::Scope scope(m_context);
+
+        v8::Local<v8::String> code = v8ExternalString(sourceCode.source());
+        v8::Handle<v8::Script> script =
+            V8Proxy::CompileScript(code,
+                                   sourceCode.url().string(),
+                                   sourceCode.startLine() - 1);
+
+        // TODO (jianli): handle infinite recursion.
+
+        result = script->Run();
+
+        if (V8Proxy::HandleOutOfMemory())
+            return ScriptValue();
+    }
+
+    m_workerContext->thread()->messagingProxy()->
+        reportWorkerThreadActivity(m_workerContext->hasPendingActivity());
+
+    return ScriptValue(result);
+}
+
+void WorkerScriptController::forbidExecution()
+{
+    // This function is called from another thread.
+    MutexLocker lock(m_sharedDataMutex);
+    m_executionForbidden = true;
+
+    Dispose();
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(WORKERS)