Replace NPObject usage in ppapi with gin

content/renderer/pepper/pepper_try_catch.cc

 // Copyright 2014 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/pepper_try_catch.h"
 
 #include "content/renderer/pepper/pepper_plugin_instance_impl.h"
-#include "content/renderer/pepper/v8_var_converter.h"
 #include "gin/converter.h"
 #include "ppapi/shared_impl/ppapi_globals.h"
 #include "ppapi/shared_impl/var_tracker.h"
 
 namespace content {
 
 namespace {
 
 const char kConversionException[] =
     "Error: Failed conversion between PP_Var and V8 value";
 const char kInvalidException[] = "Error: An invalid exception was thrown.";
 
 }  // namespace
 
 PepperTryCatch::PepperTryCatch(PepperPluginInstanceImpl* instance,
-                               bool convert_objects)
+                               V8VarConverter::AllowObjectVars convert_objects)
     : instance_(instance),
       convert_objects_(convert_objects) {}
 
 PepperTryCatch::~PepperTryCatch() {}
 
 v8::Handle<v8::Context> PepperTryCatch::GetContext() {
   return instance_->GetContext();
 }
 
 v8::Handle<v8::Value> PepperTryCatch::ToV8(PP_Var var) {
+  if (HasException()) {
+    SetException(kConversionException);
+    return v8::Handle<v8::Value>();
+  }
+
   V8VarConverter converter(instance_->pp_instance(), convert_objects_);
   v8::Handle<v8::Value> result;
   bool success = converter.ToV8Value(var, GetContext(), &result);
   if (!success) {
     SetException(kConversionException);
     return v8::Handle<v8::Value>();
   }
   return result;
 }
 
 ppapi::ScopedPPVar PepperTryCatch::FromV8(v8::Handle<v8::Value> v8_value) {
-  if (v8_value.IsEmpty()) {
+  if (HasException() || v8_value.IsEmpty()) {
     SetException(kConversionException);
     return ppapi::ScopedPPVar();
   }
   ppapi::ScopedPPVar result;
   V8VarConverter converter(instance_->pp_instance(), convert_objects_);
   bool success = converter.FromV8ValueSync(v8_value, GetContext(), &result);
   if (!success) {
     SetException(kConversionException);
     return ppapi::ScopedPPVar();
   }
   return result;
 }
 
-PepperTryCatchV8::PepperTryCatchV8(PepperPluginInstanceImpl* instance,
-                                   bool convert_objects,
-                                   v8::Isolate* isolate)
+PepperTryCatchV8::PepperTryCatchV8(
+    PepperPluginInstanceImpl* instance,
+    V8VarConverter::AllowObjectVars convert_objects,
+    v8::Isolate* isolate)
     : PepperTryCatch(instance, convert_objects),
       exception_(PP_MakeUndefined()) {
   // Typically when using PepperTryCatchV8 we are passed an isolate. We verify
   // that this isolate is the same as the plugin isolate.
   DCHECK(isolate == instance_->GetIsolate());
   // We assume we are already in the plugin context for PepperTryCatchV8.
   DCHECK(GetContext() == isolate->GetCurrentContext());
 }
 
 PepperTryCatchV8::~PepperTryCatchV8() {
   ppapi::PpapiGlobals::Get()->GetVarTracker()->ReleaseVar(exception_);
 }
 
 bool PepperTryCatchV8::HasException() {
-  return exception_.type != PP_VARTYPE_UNDEFINED;
+  return GetContext().IsEmpty() || exception_.type != PP_VARTYPE_UNDEFINED;
 }
 
 bool PepperTryCatchV8::ThrowException() {
   if (!HasException())
     return false;
 
+  // If the plugin context is gone, then we have an exception but we don't try
+  // to throw it into v8.
+  if (GetContext().IsEmpty())
+    return true;
+
   std::string message(kInvalidException);
   ppapi::StringVar* message_var = ppapi::StringVar::FromPPVar(exception_);
   if (message_var)
     message = message_var->value();
   instance_->GetIsolate()->ThrowException(v8::Exception::Error(
       gin::StringToV8(instance_->GetIsolate(), message)));
 
   ppapi::PpapiGlobals::Get()->GetVarTracker()->ReleaseVar(exception_);
   exception_ = PP_MakeUndefined();
   return true;
 }
 
 void PepperTryCatchV8::ThrowException(const char* message) {
   SetException(message);
   ThrowException();
 }
 
 void PepperTryCatchV8::SetException(const char* message) {
   if (HasException()) {
     NOTREACHED();
     return;
   }
   exception_ = ppapi::StringVar::StringToPPVar(message);
 }
 
 PepperTryCatchVar::PepperTryCatchVar(PepperPluginInstanceImpl* instance,
-                                     bool convert_objects,
                                      PP_Var* exception)
-    : PepperTryCatch(instance, convert_objects),
+    : PepperTryCatch(instance, V8VarConverter::kAllowObjectVars),
       handle_scope_(instance_->GetIsolate()),
       exception_(exception),
       exception_is_set_(false) {
   // We switch to the plugin context.
-  GetContext()->Enter();
+  v8::Handle<v8::Context> context = GetContext();
+  if (!context.IsEmpty())
+    context->Enter();
 }
 
 PepperTryCatchVar::~PepperTryCatchVar() {
-  GetContext()->Exit();
+  v8::Handle<v8::Context> context = GetContext();
+  if (!context.IsEmpty())
+    context->Exit();
 }
 
 bool PepperTryCatchVar::HasException() {
-  // Check if a v8 exception was caught.
-  if (!exception_is_set_ && try_catch_.HasCaught()) {
+  if (exception_is_set_)
+    return true;
+
+  std::string exception_message;
+  if (GetContext().IsEmpty()) {
+    exception_message = "The v8 context has been destroyed.";
+  } else if (try_catch_.HasCaught()) {
     v8::String::Utf8Value utf8(try_catch_.Message()->Get());
-    if (exception_) {
-      *exception_ = ppapi::StringVar::StringToPPVar(
-          std::string(*utf8, utf8.length()));
-    }
+    exception_message = std::string(*utf8, utf8.length());
+  }
+
+  if (!exception_message.empty()) {
     exception_is_set_ = true;
+    if (exception_)
+      *exception_ = ppapi::StringVar::StringToPPVar(exception_message);
   }
 
   return exception_is_set_;
 }
 
 void PepperTryCatchVar::SetException(const char* message) {
   if (exception_is_set_) {
     NOTREACHED();
     return;
   }
   if (exception_)
     *exception_ = ppapi::StringVar::StringToPPVar(message, strlen(message));
   exception_is_set_ = true;
 }
 
 }  // namespace content