Revert of Replace NPObject usage in ppapi with gin

content/renderer/pepper/plugin_object.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/pepper/plugin_object.h"
 
-#include "base/bind.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_util.h"
+#include "content/renderer/pepper/npapi_glue.h"
 #include "content/renderer/pepper/pepper_plugin_instance_impl.h"
-#include "content/renderer/pepper/pepper_try_catch.h"
 #include "content/renderer/pepper/plugin_module.h"
-#include "content/renderer/pepper/v8_var_converter.h"
-#include "gin/arguments.h"
-#include "gin/converter.h"
-#include "gin/function_template.h"
-#include "gin/handle.h"
-#include "gin/interceptor.h"
-#include "gin/object_template_builder.h"
-#include "gin/public/gin_embedders.h"
 #include "ppapi/c/dev/ppb_var_deprecated.h"
 #include "ppapi/c/dev/ppp_class_deprecated.h"
 #include "ppapi/c/pp_resource.h"
 #include "ppapi/c/pp_var.h"
 #include "ppapi/shared_impl/ppapi_globals.h"
 #include "ppapi/shared_impl/resource_tracker.h"
 #include "ppapi/shared_impl/var.h"
 #include "ppapi/shared_impl/var_tracker.h"
+#include "third_party/WebKit/public/web/WebBindings.h"
+#include "third_party/npapi/bindings/npapi.h"
+#include "third_party/npapi/bindings/npruntime.h"
 
 using ppapi::PpapiGlobals;
-using ppapi::ScopedPPVar;
-using ppapi::ScopedPPVarArray;
 using ppapi::StringVar;
 using ppapi::Var;
+using blink::WebBindings;
 
 namespace content {
 
 namespace {
 
 const char kInvalidValueException[] = "Error: Invalid value";
 
+// NPObject implementation in terms of PPP_Class_Deprecated --------------------
+
+NPObject* WrapperClass_Allocate(NPP npp, NPClass* unused) {
+  return PluginObject::AllocateObjectWrapper();
+}
+
+void WrapperClass_Deallocate(NPObject* np_object) {
+  PluginObject* plugin_object = PluginObject::FromNPObject(np_object);
+  if (plugin_object) {
+    plugin_object->ppp_class()->Deallocate(plugin_object->ppp_class_data());
+    delete plugin_object;
+  }
+  delete np_object;
+}
+
+void WrapperClass_Invalidate(NPObject* object) {}
+
+bool WrapperClass_HasMethod(NPObject* object, NPIdentifier method_name) {
+  NPObjectAccessorWithIdentifier accessor(object, method_name, false);
+  if (!accessor.is_valid())
+    return false;
+
+  PPResultAndExceptionToNPResult result_converter(
+      accessor.object()->GetNPObject(), NULL);
+  bool rv = accessor.object()->ppp_class()->HasMethod(
+      accessor.object()->ppp_class_data(),
+      accessor.identifier(),
+      result_converter.exception());
+  result_converter.CheckExceptionForNoResult();
+  return rv;
+}
+
+bool WrapperClass_Invoke(NPObject* object,
+                         NPIdentifier method_name,
+                         const NPVariant* argv,
+                         uint32_t argc,
+                         NPVariant* result) {
+  NPObjectAccessorWithIdentifier accessor(object, method_name, false);
+  if (!accessor.is_valid())
+    return false;
+
+  PPResultAndExceptionToNPResult result_converter(
+      accessor.object()->GetNPObject(), result);
+  PPVarArrayFromNPVariantArray args(accessor.object()->instance(), argc, argv);
+
+  // For the OOP plugin case we need to grab a reference on the plugin module
+  // object to ensure that it is not destroyed courtsey an incoming
+  // ExecuteScript call which destroys the plugin module and in turn the
+  // dispatcher.
+  scoped_refptr<PluginModule> ref(accessor.object()->instance()->module());
+
+  return result_converter.SetResult(
+      accessor.object()->ppp_class()->Call(accessor.object()->ppp_class_data(),
+                                           accessor.identifier(),
+                                           argc,
+                                           args.array(),
+                                           result_converter.exception()));
+}
+
+bool WrapperClass_InvokeDefault(NPObject* np_object,
+                                const NPVariant* argv,
+                                uint32_t argc,
+                                NPVariant* result) {
+  PluginObject* obj = PluginObject::FromNPObject(np_object);
+  if (!obj)
+    return false;
+
+  PPVarArrayFromNPVariantArray args(obj->instance(), argc, argv);
+  PPResultAndExceptionToNPResult result_converter(obj->GetNPObject(), result);
+
+  // For the OOP plugin case we need to grab a reference on the plugin module
+  // object to ensure that it is not destroyed courtsey an incoming
+  // ExecuteScript call which destroys the plugin module and in turn the
+  // dispatcher.
+  scoped_refptr<PluginModule> ref(obj->instance()->module());
+
+  result_converter.SetResult(
+      obj->ppp_class()->Call(obj->ppp_class_data(),
+                             PP_MakeUndefined(),
+                             argc,
+                             args.array(),
+                             result_converter.exception()));
+  return result_converter.success();
+}
+
+bool WrapperClass_HasProperty(NPObject* object, NPIdentifier property_name) {
+  NPObjectAccessorWithIdentifier accessor(object, property_name, true);
+  if (!accessor.is_valid())
+    return false;
+
+  PPResultAndExceptionToNPResult result_converter(
+      accessor.object()->GetNPObject(), NULL);
+  bool rv = accessor.object()->ppp_class()->HasProperty(
+      accessor.object()->ppp_class_data(),
+      accessor.identifier(),
+      result_converter.exception());
+  result_converter.CheckExceptionForNoResult();
+  return rv;
+}
+
+bool WrapperClass_GetProperty(NPObject* object,
+                              NPIdentifier property_name,
+                              NPVariant* result) {
+  NPObjectAccessorWithIdentifier accessor(object, property_name, true);
+  if (!accessor.is_valid())
+    return false;
+
+  PPResultAndExceptionToNPResult result_converter(
+      accessor.object()->GetNPObject(), result);
+  return result_converter.SetResult(accessor.object()->ppp_class()->GetProperty(
+      accessor.object()->ppp_class_data(),
+      accessor.identifier(),
+      result_converter.exception()));
+}
+
+bool WrapperClass_SetProperty(NPObject* object,
+                              NPIdentifier property_name,
+                              const NPVariant* value) {
+  NPObjectAccessorWithIdentifier accessor(object, property_name, true);
+  if (!accessor.is_valid())
+    return false;
+
+  PPResultAndExceptionToNPResult result_converter(
+      accessor.object()->GetNPObject(), NULL);
+  PP_Var value_var = NPVariantToPPVar(accessor.object()->instance(), value);
+  accessor.object()->ppp_class()->SetProperty(
+      accessor.object()->ppp_class_data(),
+      accessor.identifier(),
+      value_var,
+      result_converter.exception());
+  PpapiGlobals::Get()->GetVarTracker()->ReleaseVar(value_var);
+  return result_converter.CheckExceptionForNoResult();
+}
+
+bool WrapperClass_RemoveProperty(NPObject* object, NPIdentifier property_name) {
+  NPObjectAccessorWithIdentifier accessor(object, property_name, true);
+  if (!accessor.is_valid())
+    return false;
+
+  PPResultAndExceptionToNPResult result_converter(
+      accessor.object()->GetNPObject(), NULL);
+  accessor.object()->ppp_class()->RemoveProperty(
+      accessor.object()->ppp_class_data(),
+      accessor.identifier(),
+      result_converter.exception());
+  return result_converter.CheckExceptionForNoResult();
+}
+
+bool WrapperClass_Enumerate(NPObject* object,
+                            NPIdentifier** values,
+                            uint32_t* count) {
+  *values = NULL;
+  *count = 0;
+  PluginObject* obj = PluginObject::FromNPObject(object);
+  if (!obj)
+    return false;
+
+  uint32_t property_count = 0;
+  PP_Var* properties = NULL;  // Must be freed!
+  PPResultAndExceptionToNPResult result_converter(obj->GetNPObject(), NULL);
+  obj->ppp_class()->GetAllPropertyNames(obj->ppp_class_data(),
+                                        &property_count,
+                                        &properties,
+                                        result_converter.exception());
+
+  // Convert the array of PP_Var to an array of NPIdentifiers. If any
+  // conversions fail, we will set the exception.
+  if (!result_converter.has_exception()) {
+    if (property_count > 0) {
+      *values = static_cast<NPIdentifier*>(
+          calloc(property_count, sizeof(NPIdentifier)));
+      *count = 0;  // Will be the number of items successfully converted.
+      for (uint32_t i = 0; i < property_count; ++i) {
+        (*values)[i] = PPVarToNPIdentifier(properties[i]);
+        if (!(*values)[i]) {
+          // Throw an exception for the failed convertion.
+          *result_converter.exception() =
+              StringVar::StringToPPVar(kInvalidValueException);
+          break;
+        }
+        (*count)++;
+      }
+
+      if (result_converter.has_exception()) {
+        // We don't actually have to free the identifiers we converted since
+        // all identifiers leak anyway :( .
+        free(*values);
+        *values = NULL;
+        *count = 0;
+      }
+    }
+  }
+
+  // This will actually throw the exception, either from GetAllPropertyNames,
+  // or if anything was set during the conversion process.
+  result_converter.CheckExceptionForNoResult();
+
+  // Release the PP_Var that the plugin allocated. On success, they will all
+  // be converted to NPVariants, and on failure, we want them to just go away.
+  ppapi::VarTracker* var_tracker = PpapiGlobals::Get()->GetVarTracker();
+  for (uint32_t i = 0; i < property_count; ++i)
+    var_tracker->ReleaseVar(properties[i]);
+  free(properties);
+  return result_converter.success();
+}
+
+bool WrapperClass_Construct(NPObject* object,
+                            const NPVariant* argv,
+                            uint32_t argc,
+                            NPVariant* result) {
+  PluginObject* obj = PluginObject::FromNPObject(object);
+  if (!obj)
+    return false;
+
+  PPVarArrayFromNPVariantArray args(obj->instance(), argc, argv);
+  PPResultAndExceptionToNPResult result_converter(obj->GetNPObject(), result);
+  return result_converter.SetResult(obj->ppp_class()->Construct(
+      obj->ppp_class_data(), argc, args.array(), result_converter.exception()));
+}
+
+const NPClass wrapper_class = {
+    NP_CLASS_STRUCT_VERSION,     WrapperClass_Allocate,
+    WrapperClass_Deallocate,     WrapperClass_Invalidate,
+    WrapperClass_HasMethod,      WrapperClass_Invoke,
+    WrapperClass_InvokeDefault,  WrapperClass_HasProperty,
+    WrapperClass_GetProperty,    WrapperClass_SetProperty,
+    WrapperClass_RemoveProperty, WrapperClass_Enumerate,
+    WrapperClass_Construct};
+
 }  // namespace
 
 // PluginObject ----------------------------------------------------------------
 
+struct PluginObject::NPObjectWrapper : public NPObject {
+  // Points to the var object that owns this wrapper. This value may be NULL
+  // if there is no var owning this wrapper. This can happen if the plugin
+  // releases all references to the var, but a reference to the underlying
+  // NPObject is still held by script on the page.
+  PluginObject* obj;
+};
+
+PluginObject::PluginObject(PepperPluginInstanceImpl* instance,
+                           NPObjectWrapper* object_wrapper,
+                           const PPP_Class_Deprecated* ppp_class,
+                           void* ppp_class_data)
+    : instance_(instance),
+      object_wrapper_(object_wrapper),
+      ppp_class_(ppp_class),
+      ppp_class_data_(ppp_class_data) {
+  // Make the object wrapper refer back to this class so our NPObject
+  // implementation can call back into the Pepper layer.
+  object_wrapper_->obj = this;
+  instance_->AddPluginObject(this);
+}
+
 PluginObject::~PluginObject() {
-  if (instance_) {
-    ppp_class_->Deallocate(ppp_class_data_);
-    instance_->RemovePluginObject(this);
-  }
-}
-
-// static
-gin::WrapperInfo PluginObject::kWrapperInfo = {gin::kEmbedderNativeGin};
-
-// static
-PluginObject* PluginObject::FromV8Object(v8::Isolate* isolate,
-                                         v8::Handle<v8::Object> v8_object) {
-  PluginObject* plugin_object;
-  if (!v8_object.IsEmpty() &&
-      gin::ConvertFromV8(isolate, v8_object, &plugin_object)) {
-    return plugin_object;
-  }
-  return NULL;
-}
-
-// static
+  // The wrapper we made for this NPObject may still have a reference to it
+  // from JavaScript, so we clear out its ObjectVar back pointer which will
+  // cause all calls "up" to the plugin to become NOPs. Our ObjectVar base
+  // class will release our reference to the object, which may or may not
+  // delete the NPObject.
+  DCHECK(object_wrapper_->obj == this);
+  object_wrapper_->obj = NULL;
+  instance_->RemovePluginObject(this);
+}
+
 PP_Var PluginObject::Create(PepperPluginInstanceImpl* instance,
                             const PPP_Class_Deprecated* ppp_class,
                             void* ppp_class_data) {
-  PepperTryCatchVar try_catch(instance, NULL);
-  gin::Handle<PluginObject> object =
-      gin::CreateHandle(instance->GetIsolate(),
-                        new PluginObject(instance, ppp_class, ppp_class_data));
-  ScopedPPVar result = try_catch.FromV8(object.ToV8());
-  DCHECK(!try_catch.HasException());
-  return result.Release();
-}
-
-v8::Local<v8::Value> PluginObject::GetNamedProperty(
-    v8::Isolate* isolate,
-    const std::string& identifier) {
-  ScopedPPVar identifier_var(ScopedPPVar::PassRef(),
-                             StringVar::StringToPPVar(identifier));
-  return GetPropertyOrMethod(instance_->GetIsolate(), identifier_var.get());
-}
-
-std::vector<std::string> PluginObject::EnumerateNamedProperties(
-    v8::Isolate* isolate) {
-  std::vector<std::string> result;
-  if (!instance_)
-    return result;
-
-  PepperTryCatchV8 try_catch(instance_, V8VarConverter::kAllowObjectVars,
-                             isolate);
-
-  PP_Var* name_vars;
-  uint32_t count = 0;
-  ppp_class_->GetAllPropertyNames(ppp_class_data_, &count, &name_vars,
-                                  try_catch.exception());
-  ScopedPPVarArray scoped_name_vars(
-      ScopedPPVarArray::PassPPBMemoryAllocatedArray(), name_vars, count);
-
-  if (try_catch.ThrowException())
-    return result;
-
-  for (uint32_t i = 0; i < count; ++i) {
-    StringVar* string_var = StringVar::FromPPVar(name_vars[i]);
-    if (string_var) {
-      result.push_back(string_var->value());
-    } else {
-      try_catch.ThrowException(kInvalidValueException);
-      result.clear();
-      return result;
-    }
-  }
-
-  return result;
-}
-
-void PluginObject::InstanceDeleted() {
-  instance_ = NULL;
-}
-
-PluginObject::PluginObject(PepperPluginInstanceImpl* instance,
-                           const PPP_Class_Deprecated* ppp_class,
-                           void* ppp_class_data)
-    : gin::NamedPropertyInterceptor(instance->GetIsolate(), this),
-      instance_(instance),
-      ppp_class_(ppp_class),
-      ppp_class_data_(ppp_class_data),
-      weak_factory_(this) {
-  instance_->AddPluginObject(this);
-}
-
-gin::ObjectTemplateBuilder PluginObject::GetObjectTemplateBuilder(
-    v8::Isolate* isolate) {
-  return Wrappable<PluginObject>::GetObjectTemplateBuilder(isolate)
-      .AddNamedPropertyInterceptor();
-}
-
-v8::Local<v8::Value> PluginObject::GetPropertyOrMethod(v8::Isolate* isolate,
-                                                       PP_Var identifier_var) {
-  if (!instance_)
-    return v8::Local<v8::Value>();
-
-  PepperTryCatchV8 try_catch(instance_, V8VarConverter::kAllowObjectVars,
-                             isolate);
-  bool has_property =
-      ppp_class_->HasProperty(ppp_class_data_, identifier_var,
-                              try_catch.exception());
-  if (try_catch.ThrowException())
-    return v8::Local<v8::Value>();
-
-  if (has_property) {
-    ScopedPPVar result_var(ScopedPPVar::PassRef(),
-        ppp_class_->GetProperty(ppp_class_data_, identifier_var,
-                                try_catch.exception()));
-    if (try_catch.ThrowException())
-      return v8::Local<v8::Value>();
-
-    v8::Handle<v8::Value> result = try_catch.ToV8(result_var.get());
-    if (try_catch.ThrowException())
-      return v8::Local<v8::Value>();
-
-    return result;
-  }
-
-  bool has_method = identifier_var.type == PP_VARTYPE_STRING &&
-                    ppp_class_->HasMethod(ppp_class_data_, identifier_var,
-                                          try_catch.exception());
-  if (try_catch.ThrowException())
-    return v8::Local<v8::Value>();
-
-  if (has_method) {
-    const std::string& identifier =
-        StringVar::FromPPVar(identifier_var)->value();
-    return gin::CreateFunctionTemplate(isolate,
-                                       base::Bind(&PluginObject::Call,
-                                                  weak_factory_.GetWeakPtr(),
-                                                  identifier))->GetFunction();
-  }
-
-  return v8::Local<v8::Value>();
-}
-
-void PluginObject::Call(const std::string& identifier,
-                        gin::Arguments* args) {
-  if (!instance_)
-    return;
-
-  PepperTryCatchV8 try_catch(instance_, V8VarConverter::kAllowObjectVars,
-                             args->isolate());
-  ScopedPPVar identifier_var(ScopedPPVar::PassRef(),
-                             StringVar::StringToPPVar(identifier));
-  ScopedPPVarArray argument_vars(args->Length());
-
-  for (uint32_t i = 0; i < argument_vars.size(); ++i) {
-    v8::Handle<v8::Value> arg;
-    if (!args->GetNext(&arg)) {
-      NOTREACHED();
-    }
-
-    argument_vars.Set(i, try_catch.FromV8(arg));
-    if (try_catch.ThrowException())
-      return;
-  }
-
-  // For the OOP plugin case we need to grab a reference on the plugin module
-  // object to ensure that it is not destroyed courtesy an incoming
-  // ExecuteScript call which destroys the plugin module and in turn the
-  // dispatcher.
-  scoped_refptr<PluginModule> ref(instance_->module());
-
-  ScopedPPVar result_var(ScopedPPVar::PassRef(),
-      ppp_class_->Call(ppp_class_data_, identifier_var.get(),
-                       argument_vars.size(), argument_vars.get(),
-                       try_catch.exception()));
-  if (try_catch.ThrowException())
-    return;
-
-  v8::Handle<v8::Value> result = try_catch.ToV8(result_var.get());
-  if (try_catch.ThrowException())
-    return;
-
-  args->Return(result);
+  // This will internally end up calling our AllocateObjectWrapper via the
+  // WrapperClass_Allocated function which will have created an object wrapper
+  // appropriate for this class (derived from NPObject).
+  NPObjectWrapper* wrapper =
+      static_cast<NPObjectWrapper*>(WebBindings::createObject(
+          instance->instanceNPP(), const_cast<NPClass*>(&wrapper_class)));
+
+  // This object will register itself both with the NPObject and with the
+  // PluginModule. The NPObject will normally handle its lifetime, and it
+  // will get deleted in the destroy method. It may also get deleted when the
+  // plugin module is deallocated.
+  new PluginObject(instance, wrapper, ppp_class, ppp_class_data);
+
+  // We can just use a normal ObjectVar to refer to this object from the
+  // plugin. It will hold a ref to the underlying NPObject which will in turn
+  // hold our pluginObject.
+  PP_Var obj_var(NPObjectToPPVar(instance, wrapper));
+
+  // Note that the ObjectVar constructor incremented the reference count, and so
+  // did WebBindings::createObject above. Now that the PP_Var has taken
+  // ownership, we need to release to balance out the createObject reference
+  // count bump.
+  WebBindings::releaseObject(wrapper);
+  return obj_var;
+}
+
+NPObject* PluginObject::GetNPObject() const { return object_wrapper_; }
+
+// static
+bool PluginObject::IsInstanceOf(NPObject* np_object,
+                                const PPP_Class_Deprecated* ppp_class,
+                                void** ppp_class_data) {
+  // Validate that this object is implemented by our wrapper class before
+  // trying to get the PluginObject.
+  if (np_object->_class != &wrapper_class)
+    return false;
+
+  PluginObject* plugin_object = FromNPObject(np_object);
+  if (!plugin_object)
+    return false;  // Object is no longer alive.
+
+  if (plugin_object->ppp_class() != ppp_class)
+    return false;
+  if (ppp_class_data)
+    *ppp_class_data = plugin_object->ppp_class_data();
+  return true;
+}
+
+// static
+PluginObject* PluginObject::FromNPObject(NPObject* object) {
+  return static_cast<NPObjectWrapper*>(object)->obj;
+}
+
+// static
+NPObject* PluginObject::AllocateObjectWrapper() {
+  NPObjectWrapper* wrapper = new NPObjectWrapper;
+  memset(wrapper, 0, sizeof(NPObjectWrapper));
+  return wrapper;
 }
 
 }  // namespace content