WIP: Implement binding layer for Blink-in-JavaScript

Source/bindings/v8/V8BlinkInJavaScript.cpp

Index: Source/bindings/v8/V8BlinkInJavaScript.cpp
diff --git a/Source/bindings/v8/V8BlinkInJavaScript.cpp b/Source/bindings/v8/V8BlinkInJavaScript.cpp
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+/*
+ * Copyright (C) 2014 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.
+ */
+
+#include "config.h"
+#include "bindings/v8/V8BlinkInJavaScript.h"
+
+#include "BlinkInJavaScript.h"
+#include "V8Window.h"
+#include "bindings/v8/DOMWrapperWorld.h"
+#include "bindings/v8/ScriptController.h"
+#include "bindings/v8/V8Binding.h"
+#include "bindings/v8/V8PerIsolateData.h"
+#include "bindings/v8/V8ScriptRunner.h"
+#include "bindings/v8/V8WindowShell.h"
+#include "core/dom/Document.h"
+#include "core/frame/Frame.h"
+
+namespace WebCore {
+
+static v8::Handle<v8::Value> compileBlinkInJavaScript(String className, v8::Isolate* isolate)
+{
+    size_t index;
+    // |kBlinkInJavaScriptSources| is defined in BlinkInJavaScript.h, which is auto-generated
+    // by make_blink_in_javascript.py.
+    for (index = 0; index < WTF_ARRAY_LENGTH(kBlinkInJavaScriptSources); index++) {
+        if (className == kBlinkInJavaScriptSources[index].name)
+            break;
+    }
+    RELEASE_ASSERT(index != WTF_ARRAY_LENGTH(kBlinkInJavaScriptSources));
+
+    String source(reinterpret_cast<const char*>(kBlinkInJavaScriptSources[index].source), kBlinkInJavaScriptSources[index].size);
+    return V8ScriptRunner::compileAndRunInternalScript(v8String(isolate, source), isolate);
+}
+
+static v8::Handle<v8::Value> convertWrapperForThisWorld(v8::Handle<v8::Value> wrapper, v8::Isolate* isolate)
+{
+    // We don't need to convert primitive values.
+    if (wrapper.IsEmpty() || !wrapper->IsObject())
+        return wrapper;
+
+    // FIXME: We need to support conversion for Objects, Functions, Arrays etc.
+
+    // FIXME: This implementation is a temporary hack just for window wrappers.
+    // What we really need here is something like the following code:
+    //
+    // if (WrapperTypeInfo* typeInfo = WrapperTypeInfo::wrapperTypeInfo(wrapper)) {
+    //     return typeInfo->toV8(typeInfo->toNative(), v8::Handle<v8::Object>(), isolate);
+    // }
+    //
+    // To make the above code workable, we need to store toNative() and toV8() to WrapperTypeInfo.
+    // We also need to implement wrapperTypeInfo() which returns WrapperTypeInfo
+    // only when |wrapper| is a valid DOM wrapper.
+    if (V8Window::hasInstanceInAnyWorld(wrapper, isolate)) {
+        v8::Handle<v8::Object> object = v8::Handle<v8::Object>::Cast(wrapper);
+        DOMWindow* imp = V8Window::toNative(object);
+        return toV8(imp, v8::Handle<v8::Object>(), isolate);
+    }
+    RELEASE_ASSERT(0);
+}
+
+v8::Handle<v8::Value> V8BlinkInJavaScript::runBlinkInJavaScript(String className, String functionName, v8::Handle<v8::Value> receiver, int argc, v8::Handle<v8::Value> argv[], v8::Isolate* isolate)
+{
+    Document* document = currentDocument();
+    if (!document || !document->frame())
+        return v8::Handle<v8::Value>();
+
+    // Blink-in-JavaScript runs in the same security level as content scripts of Chrome extensions.
+    // Specifically, Blink-in-JavaScript runs in a dedicated isolated world.
+    RefPtr<DOMWrapperWorld> world = DOMWrapperWorld::ensureIsolatedWorld(BlinkInJavaScriptIsolatedWorldId, DOMWrapperWorld::blinkInJavaScriptWorldExtensionGroup);
+    V8WindowShell* isolatedWorldShell = document->frame()->script().windowShell(world.get());
+    if (!isolatedWorldShell->isContextInitialized())
+      return v8::Handle<v8::Value>();
+
+    v8::Handle<v8::Context> context = isolatedWorldShell->context();
+    v8::Handle<v8::Value> result;
+    String exceptionMessage;
+    bool exceptionCaught;
+    {
+        // Switch to the context of Blink-in-JavaScript's isolated world.
+        v8::Context::Scope contextScope(context);
+
+        v8::Handle<v8::Value> compiledClass = V8PerIsolateData::from(isolate)->compiledBlinkInJavaScript(className);
+        if (compiledClass.IsEmpty()) {
+            v8::Handle<v8::Value> installedClasses = V8PerIsolateData::from(isolate)->compiledBlinkInJavaScript("BlinkInJavaScriptController");
+            if (installedClasses.IsEmpty()) {
+                installedClasses = compileBlinkInJavaScript("BlinkInJavaScriptController", isolate);
+                V8PerIsolateData::from(isolate)->setCompiledBlinkInJavaScript("BlinkInJavaScriptController", installedClasses);
+            }
+            RELEASE_ASSERT(!installedClasses.IsEmpty());
+            RELEASE_ASSERT(installedClasses->IsObject());
+
+            compileBlinkInJavaScript(className, isolate);
+
+            compiledClass = v8::Handle<v8::Object>::Cast(installedClasses)->Get(v8String(isolate, className));
+            RELEASE_ASSERT(!compiledClass.IsEmpty());
+            RELEASE_ASSERT(compiledClass->IsObject());
+            V8PerIsolateData::from(isolate)->setCompiledBlinkInJavaScript(className, compiledClass);
+        }
+
+        v8::Handle<v8::Value> function = v8::Handle<v8::Object>::Cast(compiledClass)->Get(v8String(isolate, functionName));
+        RELEASE_ASSERT(!function.IsEmpty());
+        RELEASE_ASSERT(function->IsFunction());
+
+        // We have to convert argument wrappers to wrappers in Blink-in-JavaScript's isolated world.
+        receiver = convertWrapperForThisWorld(receiver, isolate);
+        for (int i = 0; i < argc; i++) {
+            argv[i] = convertWrapperForThisWorld(argv[i], isolate);
+        }
+
+        {
+            v8::TryCatch block;
+            result = V8ScriptRunner::callFunction(v8::Handle<v8::Function>::Cast(function), document, receiver, argc, argv, isolate);
+            exceptionCaught = block.HasCaught();
+            if (exceptionCaught) {
+                if (!block.Message().IsEmpty())
+                    exceptionMessage = toCoreString(block.Message()->Get());
+            }
+        }
+        
+    }
+
+    // We have to convert an exception thrown in Blink-in-JavaScript's isolated world
+    // to an exception in the original world.
+    if (exceptionCaught) {
+        // FIXME: Support other error types. We need to add V8 APIs to extract types from Exception objects.
+        return v8::Exception::Error(v8String(isolate, exceptionMessage));
+    }
+
+    // We have to convert a return wrapper created in Blink-in-JavaScript's isolated world
+    // to a wrapper in the original world.
+    return convertWrapperForThisWorld(result, isolate);
+}
+
+} // namespace WebCore