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// Copyright 2017 Google Inc. All Rights Reserved.
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.
#include <string>
#include <unordered_map>
#include <vector>
#include "base/basictypes.h"
#include "base/hash_tables.h"
#include "base/logging.h"
#include "base/optional.h"
#include "base/stl_util.h"
#include "base/threading/thread_checker.h"
#include "cobalt/script/global_environment.h"
#include "cobalt/script/javascript_engine.h"
#include "cobalt/script/v8c/v8c_heap_tracer.h"
#include "cobalt/script/v8c/wrapper_factory.h"
#include "v8/include/libplatform/libplatform.h"
#include "v8/include/v8.h"
namespace cobalt {
namespace script {
namespace v8c {
class V8cScriptValueFactory;
class ReferencedObjectMap;
class WeakHandle;
// A wrapper of |v8::Context|, which holds the global object.
class V8cGlobalEnvironment : public GlobalEnvironment,
public Wrappable::CachedWrapperAccessor {
// Helper function to allow others to retrieve us (a |V8cGlobalEnvironment|)
// from our |v8::Isolate|.
static V8cGlobalEnvironment* GetFromIsolate(v8::Isolate* isolate) {
return static_cast<V8cGlobalEnvironment*>(
explicit V8cGlobalEnvironment(v8::Isolate* isolate);
~V8cGlobalEnvironment() override;
void CreateGlobalObject() override;
template <typename GlobalInterface>
void CreateGlobalObject(
const scoped_refptr<GlobalInterface>& global_interface,
EnvironmentSettings* environment_settings);
bool EvaluateScript(const scoped_refptr<SourceCode>& script,
std::string* out_result_utf8) override;
bool EvaluateScript(
const scoped_refptr<SourceCode>& script_utf8,
const scoped_refptr<Wrappable>& owning_object,
base::optional<ValueHandleHolder::Reference>* out_value_handle) override;
std::vector<StackFrame> GetStackTrace(int max_frames) override;
using GlobalEnvironment::GetStackTrace;
void PreventGarbageCollection(
const scoped_refptr<Wrappable>& wrappable) override;
void AllowGarbageCollection(
const scoped_refptr<Wrappable>& wrappable) override;
void AddRoot(Traceable* traceable) override;
void RemoveRoot(Traceable* traceable) override;
void DisableEval(const std::string& message) override;
void EnableEval() override;
void DisableJit() override;
void SetReportEvalCallback(const base::Closure& report_eval) override;
void SetReportErrorCallback(
const ReportErrorCallback& report_error_callback) override;
void Bind(const std::string& identifier,
const scoped_refptr<Wrappable>& impl) override;
ScriptValueFactory* script_value_factory() override;
v8::Isolate* isolate() const { return isolate_; }
v8::Local<v8::Context> context() const {
return v8::Local<v8::Context>::New(isolate_, context_);
// Check whether we have interface data loaded for interface key |key|.
bool HasInterfaceData(int key) const;
// Get interface data for |key|. Attempting to get interface data for a key
// that does not have any is a usage error. Check |HasInterfaceData| first.
v8::Local<v8::FunctionTemplate> GetInterfaceData(int key) const;
// Register interface data (which is just |function_template|) for key
// |key|. Attempting to add interface data for a key that already has
// interface data is a usage error.
void AddInterfaceData(int key,
v8::Local<v8::FunctionTemplate> function_template);
WrapperFactory* wrapper_factory() const { return wrapper_factory_.get(); }
Wrappable* global_wrappable() const { return global_wrappable_; }
EnvironmentSettings* GetEnvironmentSettings() const {
return environment_settings_;
// A helper class to trigger a final necessary garbage collection to run
// finalizer callbacks precisely in between |global_wrappable_| getting
// propped up and |context_| + |global_object_| getting reset.
class DestructionHelper {
explicit DestructionHelper(v8::Isolate* isolate) : isolate_(isolate) {}
v8::Isolate* isolate_;
static bool AllowCodeGenerationFromStringsCallback(
v8::Local<v8::Context> context, v8::Local<v8::String> source);
static void MessageHandler(v8::Local<v8::Message> message,
v8::Local<v8::Value> data);
v8::MaybeLocal<v8::Value> EvaluateScriptInternal(
const scoped_refptr<SourceCode>& source_code);
void EvaluateEmbeddedScript(const unsigned char* data, size_t size,
const char* filename);
// Evaluates any automatically included Javascript for the environment.
void EvaluateAutomatics();
// Where we store ourselves as embedder private data in our corresponding
// |v8::Isolate|.
static const int kIsolateDataIndex = 1;
base::ThreadChecker thread_checker_;
v8::Isolate* isolate_;
// Hold an extra reference to the global wrappable in order to properly
// destruct. Were we to not do this, finalizers can run in the order (e.g.)
// document window, which the Cobalt DOM does not support.
scoped_refptr<Wrappable> global_wrappable_;
DestructionHelper destruction_helper_;
v8::Global<v8::Context> context_;
v8::Global<v8::Object> global_object_;
scoped_ptr<WrapperFactory> wrapper_factory_;
scoped_ptr<V8cScriptValueFactory> script_value_factory_;
// Data that is cached on a per-interface basis. Note that we can get to
// everything (the function instance, the prototype template, and the
// instance template) from just the function template.
std::vector<v8::Eternal<v8::FunctionTemplate>> cached_interface_data_;
EnvironmentSettings* environment_settings_ = nullptr;
// If non-NULL, the error message from the ReportErrorHandler will get
// assigned to this instead of being printed.
std::string* last_error_message_ = nullptr;
base::Closure report_eval_;
ReportErrorCallback report_error_callback_;
} // namespace v8c
} // namespace script
} // namespace cobalt