protected:

// V8 reserves the first field in context objects for the debugger. We use the

// second field to hold a reference to the sandbox object.

enum { kSandboxObjectIndex = 1 };

Environment* const env_;

Persistent<Context> context_;

public:

ContextifyContext(Environment* env, Local<Object> sandbox_obj) : env_(env) {

Local<Context> v8_context = CreateV8Context(env, sandbox_obj);

context_.Reset(env->isolate(), v8_context);

// Allocation failure or maximum call stack size reached

if (context_.IsEmpty())

return;

context_.SetWeak(this, WeakCallback, v8::WeakCallbackType::kParameter);

context_.MarkIndependent();

}

~ContextifyContext() {

context_.Reset();

}

inline Environment* env() const {

return env_;

}

inline Local<Context> context() const {

return PersistentToLocal(env()->isolate(), context_);

}

inline Local<Object> global_proxy() const {

return context()->Global();

}

inline Local<Object> sandbox() const {

return Local<Object>::Cast(context()->GetEmbedderData(kSandboxObjectIndex));

}

// XXX(isaacs): This function only exists because of a shortcoming of

// the V8 SetNamedPropertyHandler function.

//

// It does not provide a way to intercept Object.defineProperty(..)

// calls. As a result, these properties are not copied onto the

// contextified sandbox when a new global property is added via either

// a function declaration or a Object.defineProperty(global, ...) call.

//

// Note that any function declarations or Object.defineProperty()

// globals that are created asynchronously (in a setTimeout, callback,

// etc.) will happen AFTER the call to copy properties, and thus not be

// caught.

//

// The way to properly fix this is to add some sort of a

// Object::SetNamedDefinePropertyHandler() function that takes a callback,

// which receives the property name and property descriptor as arguments.

//

// Luckily, such situations are rare, and asynchronously-added globals

// weren't supported by Node's VM module until 0.12 anyway. But, this

// should be fixed properly in V8, and this copy function should be

// removed once there is a better way.

void CopyProperties() {

HandleScope scope(env()->isolate());

Local<Context> context = PersistentToLocal(env()->isolate(), context_);

Local<Object> global =

context->Global()->GetPrototype()->ToObject(env()->isolate());

Local<Object> sandbox_obj = sandbox();

Local<Function> clone_property_method;

Local<Array> names = global->GetOwnPropertyNames();

int length = names->Length();

for (int i = 0; i < length; i++) {

Local<String> key = names->Get(i)->ToString(env()->isolate());

Maybe<bool> has = sandbox_obj->HasOwnProperty(context, key);

// Check for pending exceptions

if (has.IsNothing())

return;

if (!has.FromJust()) {

// Could also do this like so:

//

// PropertyAttribute att = global->GetPropertyAttributes(key_v);

// Local<Value> val = global->Get(key_v);

// sandbox->ForceSet(key_v, val, att);

//

// However, this doesn't handle ES6-style properties configured with

// Object.defineProperty, and that's exactly what we're up against at

// this point. ForceSet(key,val,att) only supports value properties

// with the ES3-style attribute flags (DontDelete/DontEnum/ReadOnly),

// which doesn't faithfully capture the full range of configurations

// that can be done using Object.defineProperty.

if (clone_property_method.IsEmpty()) {

Local<String> code = FIXED_ONE_BYTE_STRING(env()->isolate(),

"(function cloneProperty(source, key, target) {\n"

" if (key === 'Proxy') return;\n"

" try {\n"

" var desc = Object.getOwnPropertyDescriptor(source, key);\n"

" if (desc.value === source) desc.value = target;\n"

" Object.defineProperty(target, key, desc);\n"

" } catch (e) {\n"

" // Catch sealed properties errors\n"

" }\n"

"})");

Local<Script> script =

Script::Compile(context, code).ToLocalChecked();

clone_property_method = Local<Function>::Cast(script->Run());

CHECK(clone_property_method->IsFunction());

}

Local<Value> args[] = { global, key, sandbox_obj };

clone_property_method->Call(global, arraysize(args), args);

}

}

}

// This is an object that just keeps an internal pointer to this

// ContextifyContext. It's passed to the NamedPropertyHandler. If we

// pass the main JavaScript context object we're embedded in, then the

// NamedPropertyHandler will store a reference to it forever and keep it

// from getting gc'd.

Local<Value> CreateDataWrapper(Environment* env) {

EscapableHandleScope scope(env->isolate());

Local<Object> wrapper =

env->script_data_constructor_function()

->NewInstance(env->context()).FromMaybe(Local<Object>());

if (wrapper.IsEmpty())

return scope.Escape(Local<Value>::New(env->isolate(), Local<Value>()));

Wrap(wrapper, this);

return scope.Escape(wrapper);

}

Local<Context> CreateV8Context(Environment* env, Local<Object> sandbox_obj) {

EscapableHandleScope scope(env->isolate());

Local<FunctionTemplate> function_template =

FunctionTemplate::New(env->isolate());

function_template->SetHiddenPrototype(true);

function_template->SetClassName(sandbox_obj->GetConstructorName());

Local<ObjectTemplate> object_template =

function_template->InstanceTemplate();

NamedPropertyHandlerConfiguration config(GlobalPropertyGetterCallback,

GlobalPropertySetterCallback,

GlobalPropertyQueryCallback,

GlobalPropertyDeleterCallback,

GlobalPropertyEnumeratorCallback,

CreateDataWrapper(env));

object_template->SetHandler(config);

Local<Context> ctx = Context::New(env->isolate(), nullptr, object_template);

if (ctx.IsEmpty()) {

env->ThrowError("Could not instantiate context");

return Local<Context>();

}

ctx->SetSecurityToken(env->context()->GetSecurityToken());

// We need to tie the lifetime of the sandbox object with the lifetime of

// newly created context. We do this by making them hold references to each

// other. The context can directly hold a reference to the sandbox as an

// embedder data field. However, we cannot hold a reference to a v8::Context

// directly in an Object, we instead hold onto the new context's global

// object instead (which then has a reference to the context).

ctx->SetEmbedderData(kSandboxObjectIndex, sandbox_obj);

sandbox_obj->SetPrivate(env->context(),

env->contextify_global_private_symbol(),

ctx->Global());

env->AssignToContext(ctx);

return scope.Escape(ctx);

}

static void Init(Environment* env, Local<Object> target) {

Local<FunctionTemplate> function_template =

FunctionTemplate::New(env->isolate());

function_template->InstanceTemplate()->SetInternalFieldCount(1);

env->set_script_data_constructor_function(function_template->GetFunction());

env->SetMethod(target, "runInDebugContext", RunInDebugContext);

env->SetMethod(target, "makeContext", MakeContext);

env->SetMethod(target, "isContext", IsContext);

}

static void RunInDebugContext(const FunctionCallbackInfo<Value>& args) {

Local<String> script_source(args[0]->ToString(args.GetIsolate()));

if (script_source.IsEmpty())

return; // Exception pending.

Local<Context> debug_context = Debug::GetDebugContext(args.GetIsolate());

Environment* env = Environment::GetCurrent(args);

if (debug_context.IsEmpty()) {

// Force-load the debug context.

Debug::GetMirror(args.GetIsolate()->GetCurrentContext(), args[0]);

debug_context = Debug::GetDebugContext(args.GetIsolate());

CHECK(!debug_context.IsEmpty());

// Ensure that the debug context has an Environment assigned in case

// a fatal error is raised. The fatal exception handler in node.cc

// is not equipped to deal with contexts that don't have one and

// can't easily be taught that due to a deficiency in the V8 API:

// there is no way for the embedder to tell if the data index is

// in use.

const int index = Environment::kContextEmbedderDataIndex;

debug_context->SetAlignedPointerInEmbedderData(index, env);

}

Context::Scope context_scope(debug_context);

MaybeLocal<Script> script = Script::Compile(debug_context, script_source);

if (script.IsEmpty())

return; // Exception pending.

args.GetReturnValue().Set(script.ToLocalChecked()->Run());

}

static void MakeContext(const FunctionCallbackInfo<Value>& args) {

Environment* env = Environment::GetCurrent(args);

if (!args[0]->IsObject()) {

return env->ThrowTypeError("sandbox argument must be an object.");

}

Local<Object> sandbox = args[0].As<Object>();

// Don't allow contextifying a sandbox multiple times.

CHECK(

!sandbox->HasPrivate(

env->context(),

env->contextify_context_private_symbol()).FromJust());

TryCatch try_catch(env->isolate());

ContextifyContext* context = new ContextifyContext(env, sandbox);

if (try_catch.HasCaught()) {

try_catch.ReThrow();

return;

}

if (context->context().IsEmpty())

return;

sandbox->SetPrivate(

env->context(),

env->contextify_context_private_symbol(),

External::New(env->isolate(), context));

}

static void IsContext(const FunctionCallbackInfo<Value>& args) {

Environment* env = Environment::GetCurrent(args);

if (!args[0]->IsObject()) {

env->ThrowTypeError("sandbox must be an object");

return;

}

Local<Object> sandbox = args[0].As<Object>();

Maybe<bool> result =

sandbox->HasPrivate(env->context(),

env->contextify_context_private_symbol());

args.GetReturnValue().Set(result.FromJust());

}

static void WeakCallback(const WeakCallbackInfo<ContextifyContext>& data) {

ContextifyContext* context = data.GetParameter();

delete context;

}

static ContextifyContext* ContextFromContextifiedSandbox(

Environment* env,

const Local<Object>& sandbox) {

MaybeLocal<Value> maybe_value =

sandbox->GetPrivate(env->context(),

env->contextify_context_private_symbol());

Local<Value> context_external_v;

if (maybe_value.ToLocal(&context_external_v) &&

context_external_v->IsExternal()) {

Local<External> context_external = context_external_v.As<External>();

return static_cast<ContextifyContext*>(context_external->Value());

}

return nullptr;

}

static void GlobalPropertyGetterCallback(

Local<Name> property,

const PropertyCallbackInfo<Value>& args) {

ContextifyContext* ctx;

ASSIGN_OR_RETURN_UNWRAP(&ctx, args.Data().As<Object>());

// Still initializing

if (ctx->context_.IsEmpty())

return;

Local<Context> context = ctx->context();

Local<Object> sandbox = ctx->sandbox();

MaybeLocal<Value> maybe_rv =

sandbox->GetRealNamedProperty(context, property);

if (maybe_rv.IsEmpty()) {

maybe_rv =

ctx->global_proxy()->GetRealNamedProperty(context, property);

}

Local<Value> rv;

if (maybe_rv.ToLocal(&rv)) {

if (rv == sandbox)

rv = ctx->global_proxy();

args.GetReturnValue().Set(rv);

}

}

static void GlobalPropertySetterCallback(

Local<Name> property,

Local<Value> value,

const PropertyCallbackInfo<Value>& args) {

ContextifyContext* ctx;

ASSIGN_OR_RETURN_UNWRAP(&ctx, args.Data().As<Object>());

// Still initializing

if (ctx->context_.IsEmpty())

return;

auto attributes = PropertyAttribute::None;

bool is_declared =

ctx->global_proxy()->GetRealNamedPropertyAttributes(ctx->context(),

property)

.To(&attributes);

bool read_only =

static_cast<int>(attributes) &

static_cast<int>(PropertyAttribute::ReadOnly);

if (is_declared && read_only)

return;

if (!is_declared && args.ShouldThrowOnError())

return;

ctx->sandbox()->Set(property, value);

}

static void GlobalPropertyQueryCallback(

Local<Name> property,

const PropertyCallbackInfo<Integer>& args) {

ContextifyContext* ctx;

ASSIGN_OR_RETURN_UNWRAP(&ctx, args.Data().As<Object>());

// Still initializing

if (ctx->context_.IsEmpty())

return;

Local<Context> context = ctx->context();

Maybe<PropertyAttribute> maybe_prop_attr =

ctx->sandbox()->GetRealNamedPropertyAttributes(context, property);

if (maybe_prop_attr.IsNothing()) {

maybe_prop_attr =

ctx->global_proxy()->GetRealNamedPropertyAttributes(context,

property);

}

if (maybe_prop_attr.IsJust()) {

PropertyAttribute prop_attr = maybe_prop_attr.FromJust();

args.GetReturnValue().Set(prop_attr);

}

}

static void GlobalPropertyDeleterCallback(

Local<Name> property,

const PropertyCallbackInfo<Boolean>& args) {

ContextifyContext* ctx;

ASSIGN_OR_RETURN_UNWRAP(&ctx, args.Data().As<Object>());

// Still initializing

if (ctx->context_.IsEmpty())

return;

Maybe<bool> success = ctx->sandbox()->Delete(ctx->context(), property);

if (success.IsJust())

args.GetReturnValue().Set(success.FromJust());

}

static void GlobalPropertyEnumeratorCallback(

const PropertyCallbackInfo<Array>& args) {

ContextifyContext* ctx;

ASSIGN_OR_RETURN_UNWRAP(&ctx, args.Data().As<Object>());

// Still initializing

if (ctx->context_.IsEmpty())

return;

args.GetReturnValue().Set(ctx->sandbox()->GetPropertyNames());

}

private:

Persistent<UnboundScript> script_;

public:

static void Init(Environment* env, Local<Object> target) {

HandleScope scope(env->isolate());

Local<String> class_name =

FIXED_ONE_BYTE_STRING(env->isolate(), "ContextifyScript");

Local<FunctionTemplate> script_tmpl = env->NewFunctionTemplate(New);

script_tmpl->InstanceTemplate()->SetInternalFieldCount(1);

script_tmpl->SetClassName(class_name);

env->SetProtoMethod(script_tmpl, "runInContext", RunInContext);

env->SetProtoMethod(script_tmpl, "runInThisContext", RunInThisContext);

target->Set(class_name, script_tmpl->GetFunction());

env->set_script_context_constructor_template(script_tmpl);

}

// args: code, [options]

static void New(const FunctionCallbackInfo<Value>& args) {

Environment* env = Environment::GetCurrent(args);

if (!args.IsConstructCall()) {

return env->ThrowError("Must call vm.Script as a constructor.");

}

ContextifyScript* contextify_script =

new ContextifyScript(env, args.This());

TryCatch try_catch(env->isolate());

Local<String> code = args[0]->ToString(env->isolate());

Local<Value> options = args[1];

Local<String> filename = GetFilenameArg(env, options);

Local<Integer> lineOffset = GetLineOffsetArg(env, options);

Local<Integer> columnOffset = GetColumnOffsetArg(env, options);

bool display_errors = GetDisplayErrorsArg(env, options);

MaybeLocal<Uint8Array> cached_data_buf = GetCachedData(env, options);

bool produce_cached_data = GetProduceCachedData(env, options);

if (try_catch.HasCaught()) {

try_catch.ReThrow();

return;

}

ScriptCompiler::CachedData* cached_data = nullptr;

Local<Uint8Array> ui8;

if (cached_data_buf.ToLocal(&ui8)) {

ArrayBuffer::Contents contents = ui8->Buffer()->GetContents();

cached_data = new ScriptCompiler::CachedData(

static_cast<uint8_t*>(contents.Data()) + ui8->ByteOffset(),

ui8->ByteLength());

}

ScriptOrigin origin(filename, lineOffset, columnOffset);

ScriptCompiler::Source source(code, origin, cached_data);

ScriptCompiler::CompileOptions compile_options =

ScriptCompiler::kNoCompileOptions;

if (source.GetCachedData() != nullptr)

compile_options = ScriptCompiler::kConsumeCodeCache;

else if (produce_cached_data)

compile_options = ScriptCompiler::kProduceCodeCache;

MaybeLocal<UnboundScript> v8_script = ScriptCompiler::CompileUnboundScript(

env->isolate(),

&source,

compile_options);

if (v8_script.IsEmpty()) {

if (display_errors) {

DecorateErrorStack(env, try_catch);

}

try_catch.ReThrow();

return;

}

contextify_script->script_.Reset(env->isolate(),

v8_script.ToLocalChecked());

if (compile_options == ScriptCompiler::kConsumeCodeCache) {

args.This()->Set(

env->cached_data_rejected_string(),

Boolean::New(env->isolate(), source.GetCachedData()->rejected));

} else if (compile_options == ScriptCompiler::kProduceCodeCache) {

const ScriptCompiler::CachedData* cached_data = source.GetCachedData();

bool cached_data_produced = cached_data != nullptr;

if (cached_data_produced) {

MaybeLocal<Object> buf = Buffer::Copy(

env,

reinterpret_cast<const char*>(cached_data->data),

cached_data->length);

args.This()->Set(env->cached_data_string(), buf.ToLocalChecked());

}

args.This()->Set(

env->cached_data_produced_string(),

Boolean::New(env->isolate(), cached_data_produced));

}

}

static bool InstanceOf(Environment* env, const Local<Value>& value) {

return !value.IsEmpty() &&

env->script_context_constructor_template()->HasInstance(value);

}

// args: [options]

static void RunInThisContext(const FunctionCallbackInfo<Value>& args) {

Environment* env = Environment::GetCurrent(args);

// Assemble arguments

TryCatch try_catch(args.GetIsolate());

uint64_t timeout = GetTimeoutArg(env, args[0]);

bool display_errors = GetDisplayErrorsArg(env, args[0]);

bool break_on_sigint = GetBreakOnSigintArg(env, args[0]);

if (try_catch.HasCaught()) {

try_catch.ReThrow();

return;

}

// Do the eval within this context

EvalMachine(env, timeout, display_errors, break_on_sigint, args,

&try_catch);

}

// args: sandbox, [options]

static void RunInContext(const FunctionCallbackInfo<Value>& args) {

Environment* env = Environment::GetCurrent(args);

int64_t timeout;

bool display_errors;

bool break_on_sigint;

// Assemble arguments

if (!args[0]->IsObject()) {

return env->ThrowTypeError(

"contextifiedSandbox argument must be an object.");

}

Local<Object> sandbox = args[0].As<Object>();

{

TryCatch try_catch(env->isolate());

timeout = GetTimeoutArg(env, args[1]);

display_errors = GetDisplayErrorsArg(env, args[1]);

break_on_sigint = GetBreakOnSigintArg(env, args[1]);

if (try_catch.HasCaught()) {

try_catch.ReThrow();

return;

}

}

// Get the context from the sandbox

ContextifyContext* contextify_context =

ContextifyContext::ContextFromContextifiedSandbox(env, sandbox);

if (contextify_context == nullptr) {

return env->ThrowTypeError(

"sandbox argument must have been converted to a context.");

}

if (contextify_context->context().IsEmpty())

return;

{

TryCatch try_catch(env->isolate());

// Do the eval within the context

Context::Scope context_scope(contextify_context->context());

if (EvalMachine(contextify_context->env(),

timeout,

display_errors,

break_on_sigint,

args,

&try_catch)) {

contextify_context->CopyProperties();

}

if (try_catch.HasCaught()) {

try_catch.ReThrow();

return;

}

}

}

static void DecorateErrorStack(Environment* env, const TryCatch& try_catch) {

Local<Value> exception = try_catch.Exception();

if (!exception->IsObject())

return;

Local<Object> err_obj = exception.As<Object>();

if (IsExceptionDecorated(env, err_obj))

return;

AppendExceptionLine(env, exception, try_catch.Message(), CONTEXTIFY_ERROR);

Local<Value> stack = err_obj->Get(env->stack_string());

MaybeLocal<Value> maybe_value =

err_obj->GetPrivate(

env->context(),

env->arrow_message_private_symbol());

Local<Value> arrow;

if (!(maybe_value.ToLocal(&arrow) && arrow->IsString())) {

return;

}

if (stack.IsEmpty() || !stack->IsString()) {

return;

}

Local<String> decorated_stack = String::Concat(arrow.As<String>(),

stack.As<String>());

err_obj->Set(env->stack_string(), decorated_stack);

err_obj->SetPrivate(

env->context(),

env->decorated_private_symbol(),

True(env->isolate()));

}

static bool GetBreakOnSigintArg(Environment* env, Local<Value> options) {

if (options->IsUndefined() || options->IsString()) {

return false;

}

if (!options->IsObject()) {

env->ThrowTypeError("options must be an object");

return false;

}

Local<String> key = FIXED_ONE_BYTE_STRING(env->isolate(), "breakOnSigint");

Local<Value> value = options.As<Object>()->Get(key);

return value->IsTrue();

}

static int64_t GetTimeoutArg(Environment* env, Local<Value> options) {

if (options->IsUndefined() || options->IsString()) {

return -1;

}

if (!options->IsObject()) {

env->ThrowTypeError("options must be an object");

return -1;

}

Local<String> key = FIXED_ONE_BYTE_STRING(env->isolate(), "timeout");

Local<Value> value = options.As<Object>()->Get(key);

if (value->IsUndefined()) {

return -1;

}

int64_t timeout = value->IntegerValue();

if (timeout <= 0) {

env->ThrowRangeError("timeout must be a positive number");

return -1;

}

return timeout;

}

static bool GetDisplayErrorsArg(Environment* env, Local<Value> options) {

if (options->IsUndefined() || options->IsString()) {

return true;

}

if (!options->IsObject()) {

env->ThrowTypeError("options must be an object");

return false;

}

Local<String> key = FIXED_ONE_BYTE_STRING(env->isolate(), "displayErrors");

Local<Value> value = options.As<Object>()->Get(key);

return value->IsUndefined() ? true : value->BooleanValue();

}

static Local<String> GetFilenameArg(Environment* env, Local<Value> options) {

Local<String> defaultFilename =

FIXED_ONE_BYTE_STRING(env->isolate(), "evalmachine.<anonymous>");

if (options->IsUndefined()) {

return defaultFilename;

}

if (options->IsString()) {

return options.As<String>();

}

if (!options->IsObject()) {

env->ThrowTypeError("options must be an object");

return Local<String>();

}

Local<String> key = FIXED_ONE_BYTE_STRING(env->isolate(), "filename");

Local<Value> value = options.As<Object>()->Get(key);

if (value->IsUndefined())

return defaultFilename;

return value->ToString(env->isolate());

}

static MaybeLocal<Uint8Array> GetCachedData(Environment* env,

Local<Value> options) {

if (!options->IsObject()) {

return MaybeLocal<Uint8Array>();

}

Local<Value> value = options.As<Object>()->Get(env->cached_data_string());

if (value->IsUndefined()) {

return MaybeLocal<Uint8Array>();

}

if (!value->IsUint8Array()) {

env->ThrowTypeError("options.cachedData must be a Buffer instance");

return MaybeLocal<Uint8Array>();

}

return value.As<Uint8Array>();

}

static bool GetProduceCachedData(Environment* env, Local<Value> options) {

if (!options->IsObject()) {

return false;

}

Local<Value> value =

options.As<Object>()->Get(env->produce_cached_data_string());

return value->IsTrue();

}

static Local<Integer> GetLineOffsetArg(Environment* env,

Local<Value> options) {

Local<Integer> defaultLineOffset = Integer::New(env->isolate(), 0);

if (!options->IsObject()) {

return defaultLineOffset;

}

Local<String> key = FIXED_ONE_BYTE_STRING(env->isolate(), "lineOffset");

Local<Value> value = options.As<Object>()->Get(key);

return value->IsUndefined() ? defaultLineOffset : value->ToInteger();

}

static Local<Integer> GetColumnOffsetArg(Environment* env,

Local<Value> options) {

Local<Integer> defaultColumnOffset = Integer::New(env->isolate(), 0);

if (!options->IsObject()) {

return defaultColumnOffset;

}

Local<String> key = FIXED_ONE_BYTE_STRING(env->isolate(), "columnOffset");

Local<Value> value = options.As<Object>()->Get(key);

return value->IsUndefined() ? defaultColumnOffset : value->ToInteger();

}

static bool EvalMachine(Environment* env,

const int64_t timeout,

const bool display_errors,

const bool break_on_sigint,

const FunctionCallbackInfo<Value>& args,

TryCatch* try_catch) {

if (!ContextifyScript::InstanceOf(env, args.Holder())) {

env->ThrowTypeError(

"Script methods can only be called on script instances.");

return false;

}

ContextifyScript* wrapped_script;

ASSIGN_OR_RETURN_UNWRAP(&wrapped_script, args.Holder(), false);

Local<UnboundScript> unbound_script =

PersistentToLocal(env->isolate(), wrapped_script->script_);

Local<Script> script = unbound_script->BindToCurrentContext();

Local<Value> result;

bool timed_out = false;

bool received_signal = false;

if (break_on_sigint && timeout != -1) {

Watchdog wd(env->isolate(), timeout);

SigintWatchdog swd(env->isolate());

result = script->Run();

timed_out = wd.HasTimedOut();

received_signal = swd.HasReceivedSignal();

} else if (break_on_sigint) {

SigintWatchdog swd(env->isolate());

result = script->Run();

received_signal = swd.HasReceivedSignal();

} else if (timeout != -1) {

Watchdog wd(env->isolate(), timeout);

result = script->Run();

timed_out = wd.HasTimedOut();

} else {

result = script->Run();

}

if (try_catch->HasCaught()) {

if (try_catch->HasTerminated())

env->isolate()->CancelTerminateExecution();

// It is possible that execution was terminated by another timeout in

// which this timeout is nested, so check whether one of the watchdogs

// from this invocation is responsible for termination.

if (timed_out) {

env->ThrowError("Script execution timed out.");

} else if (received_signal) {

env->ThrowError("Script execution interrupted.");

}

// If there was an exception thrown during script execution, re-throw it.

// If one of the above checks threw, re-throw the exception instead of

// letting try_catch catch it.

// If execution has been terminated, but not by one of the watchdogs from

// this invocation, this will re-throw a `null` value.

try_catch->ReThrow();

return false;

}

if (result.IsEmpty()) {

// Error occurred during execution of the script.

if (display_errors) {

DecorateErrorStack(env, *try_catch);

}

try_catch->ReThrow();

return false;

}

args.GetReturnValue().Set(result);

return true;

}

ContextifyScript(Environment* env, Local<Object> object)

: BaseObject(env, object) {

MakeWeak<ContextifyScript>(this);

}

~ContextifyScript() override {

script_.Reset();

}

Local<Value> unused,

Local<Context> context) {

Environment* env = Environment::GetCurrent(context);

ContextifyContext::Init(env, target);

ContextifyScript::Init(env, target);