- Allow registration of V8 extensions with no native function handler (issue #433).

- Add a CefV8Context::InContext() method to test if V8 is currently in a context (issue #427).
- Verify that a current context exists when creating V8 arrays, functions and objects (issue #427).
- Add a v8::HandleScope in GetCurrentContext() and GetEnteredContext() to avoid "Cannot create a handle without a HandleScope" V8 errors (issue #427).

git-svn-id: https://chromiumembedded.googlecode.com/svn/trunk@391 5089003a-bbd8-11dd-ad1f-f1f9622dbc98

include/cef.h

@@ -2264,6 +2264,12 @@ public:
   /*--cef()--*/
   static CefRefPtr<CefV8Context> GetEnteredContext();
 
+  ///
+  // Returns true if V8 is currently inside a context.
+  ///
+  /*--cef()--*/
+  static bool InContext();
+
   ///
   // Returns the browser for this context.
   ///

include/cef_capi.h

@@ -2081,6 +2081,11 @@ CEF_EXPORT cef_v8context_t* cef_v8context_get_current_context();
 ///
 CEF_EXPORT cef_v8context_t* cef_v8context_get_entered_context();
 
+///
+// Returns true (1) if V8 is currently inside a context.
+///
+CEF_EXPORT int cef_v8context_in_context();
+
 
 ///
 // Structure that should be implemented to handle V8 function calls. The

libcef/v8_impl.cc

@@ -259,13 +259,18 @@ public:
                    CefV8Handler* handler)
     : v8::Extension(extension_name, javascript_code), handler_(handler)
   {
-    // The reference will be released when the application exits.
-    TrackAdd(new TrackBase(handler));
+    if (handler) {
+      // The reference will be released when the application exits.
+      TrackAdd(new TrackBase(handler));
+    }
   }
   
   virtual v8::Handle<v8::FunctionTemplate> GetNativeFunction(
     v8::Handle<v8::String> name)
   {
+    if (!handler_)
+      return v8::Handle<v8::FunctionTemplate>();
+
     return v8::FunctionTemplate::New(FunctionCallbackImpl,
                                      v8::External::Wrap(handler_));
   }
@@ -341,11 +346,6 @@ bool CefRegisterExtension(const CefString& extension_name,
   // Verify that the context is in a valid state.
   CEF_REQUIRE_VALID_CONTEXT(false);
 
-  if(!handler.get()) {
-    NOTREACHED();
-    return false;
-  }
-
   TrackString* name = new TrackString(extension_name);
   TrackAdd(name);
   TrackString* code = new TrackString(javascript_code);
@@ -368,8 +368,10 @@ CefRefPtr<CefV8Context> CefV8Context::GetCurrentContext()
   CefRefPtr<CefV8Context> context;
   CEF_REQUIRE_VALID_CONTEXT(context);
   CEF_REQUIRE_UI_THREAD(context);
-  if (v8::Context::InContext())
-    context = new CefV8ContextImpl( v8::Context::GetCurrent() );
+  if (v8::Context::InContext()) {
+    v8::HandleScope handle_scope;
+    context = new CefV8ContextImpl(v8::Context::GetCurrent());
+  }
   return context;
 }
 
@@ -379,11 +381,21 @@ CefRefPtr<CefV8Context> CefV8Context::GetEnteredContext()
   CefRefPtr<CefV8Context> context;
   CEF_REQUIRE_VALID_CONTEXT(context);
   CEF_REQUIRE_UI_THREAD(context);
-  if (v8::Context::InContext())
-    context = new CefV8ContextImpl( v8::Context::GetEntered() );
+  if (v8::Context::InContext()) {
+    v8::HandleScope handle_scope;
+    context = new CefV8ContextImpl(v8::Context::GetEntered());
+  }
   return context;
 }
 
+// static
+bool CefV8Context::InContext()
+{
+  CEF_REQUIRE_VALID_CONTEXT(false);
+  CEF_REQUIRE_UI_THREAD(false);
+  return v8::Context::InContext();
+}
+
 
 // CefV8ContextImpl
 
@@ -571,6 +583,12 @@ CefRefPtr<CefV8Value> CefV8Value::CreateObject(
 
   v8::HandleScope handle_scope;
 
+  v8::Local<v8::Context> context = v8::Context::GetCurrent();
+  if (context.IsEmpty()) {
+    NOTREACHED() << "not currently in a V8 context";
+    return NULL;
+  }
+
   // Create the new V8 object.
   v8::Local<v8::Object> obj = v8::Object::New();
 
@@ -606,6 +624,13 @@ CefRefPtr<CefV8Value> CefV8Value::CreateArray()
   CEF_REQUIRE_UI_THREAD(NULL);
 
   v8::HandleScope handle_scope;
+
+  v8::Local<v8::Context> context = v8::Context::GetCurrent();
+  if (context.IsEmpty()) {
+    NOTREACHED() << "not currently in a V8 context";
+    return NULL;
+  }
+
   return new CefV8ValueImpl(v8::Array::New());
 }
 
@@ -622,7 +647,13 @@ CefRefPtr<CefV8Value> CefV8Value::CreateFunction(const CefString& name,
   }
 
   v8::HandleScope handle_scope;
-  
+
+  v8::Local<v8::Context> context = v8::Context::GetCurrent();
+  if (context.IsEmpty()) {
+    NOTREACHED() << "not currently in a V8 context";
+    return NULL;
+  }
+
   // Create a new V8 function template with one internal field.
   v8::Local<v8::FunctionTemplate> tmpl = v8::FunctionTemplate::New();
 
@@ -634,7 +665,7 @@ CefRefPtr<CefV8Value> CefV8Value::CreateFunction(const CefString& name,
   // Retrieve the function object and set the name.
   v8::Local<v8::Function> func = tmpl->GetFunction();
   if (func.IsEmpty()) {
-    NOTREACHED() << "failed to create function";
+    NOTREACHED() << "failed to create V8 function";
     return NULL;
   }
 

libcef_dll/cpptoc/v8context_cpptoc.cc

@@ -36,6 +36,11 @@ CEF_EXPORT cef_v8context_t* cef_v8context_get_entered_context()
   return NULL;
 }
 
+CEF_EXPORT int cef_v8context_in_context()
+{
+  return CefV8Context::InContext();
+}
+
 
 // MEMBER FUNCTIONS - Body may be edited by hand.
 

libcef_dll/ctocpp/v8context_ctocpp.cc

@@ -34,6 +34,11 @@ CefRefPtr<CefV8Context> CefV8Context::GetEnteredContext()
   return NULL;
 }
 
+bool CefV8Context::InContext()
+{
+  return cef_v8context_in_context() ? true : false;
+}
+
 
 // VIRTUAL METHODS - Body may be edited by hand.
 

tests/unittests/v8_unittest.cc

@@ -391,6 +391,108 @@ TEST(V8Test, Extension)
 
 namespace {
 
+class TestNoNativeHandler : public TestHandler
+{
+public:
+  class TestHandler : public CefV8Handler
+  {
+  public:
+    TestHandler(CefRefPtr<TestNoNativeHandler> test)
+      : test_(test)
+    {
+    }
+
+    virtual bool Execute(const CefString& name,
+                         CefRefPtr<CefV8Value> object,
+                         const CefV8ValueList& arguments,
+                         CefRefPtr<CefV8Value>& retval,
+                         CefString& exception) OVERRIDE
+    {
+      if (name == "result") {
+        if (arguments.size() == 1 && arguments[0]->IsString()) {
+          std::string value = arguments[0]->GetStringValue();
+          if (value == "correct")
+            test_->got_correct_.yes();
+          else
+            return false;
+          return true;
+        }
+      }
+
+      return false;
+    }
+
+    CefRefPtr<TestNoNativeHandler> test_;
+
+    IMPLEMENT_REFCOUNTING(TestHandler);
+  };
+  
+  TestNoNativeHandler()
+  {
+  }
+
+  virtual void RunTest() OVERRIDE
+  {
+    std::string testHtml =
+        "<html><body>\n"
+        "<script language=\"JavaScript\">\n"
+        "var result = test_nonative.add(1, 2);\n"
+        "if (result == 3)\n"
+        "  window.test.result('correct');\n"
+        "</script>\n"
+        "</body></html>";
+    AddResource("http://tests/run.html", testHtml, "text/html");
+
+    CreateBrowser("http://tests/run.html");
+  }
+
+  virtual void OnLoadEnd(CefRefPtr<CefBrowser> browser,
+                         CefRefPtr<CefFrame> frame,
+                         int httpStatusCode) OVERRIDE
+  {
+    DestroyTest();
+  }
+
+  virtual void OnJSBinding(CefRefPtr<CefBrowser> browser,
+                           CefRefPtr<CefFrame> frame,
+                           CefRefPtr<CefV8Value> object) OVERRIDE
+  {
+    // Create the functions that will be used during the test.
+    CefRefPtr<CefV8Value> obj = CefV8Value::CreateObject(NULL, NULL);
+    CefRefPtr<CefV8Handler> handler = new TestHandler(this);
+    obj->SetValue("result",
+                  CefV8Value::CreateFunction("result", handler),
+                  V8_PROPERTY_ATTRIBUTE_NONE);
+    object->SetValue("test", obj, V8_PROPERTY_ATTRIBUTE_NONE);
+  }
+
+  TrackCallback got_correct_;
+};
+
+} // namespace
+
+// Verify extensions with no native functions
+TEST(V8Test, ExtensionNoNative)
+{
+  std::string extensionCode =
+    "var test_nonative;"
+    "if (!test_nonative)"
+    "  test_nonative = {};"
+    "(function() {"
+    "  test_nonative.add = function(a, b) {"
+    "    return a + b;"
+    "  };"
+    "})();";
+  CefRegisterExtension("v8/test_nonative", extensionCode, NULL);
+
+  CefRefPtr<TestNoNativeHandler> handler = new TestNoNativeHandler();
+  handler->ExecuteTest();
+
+  EXPECT_TRUE(handler->got_correct_);
+}
+
+namespace {
+
 // Using a delegate so that the code below can remain inline.
 class CefV8HandlerDelegate
 {