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// Copyright 2015 the V8 project 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 "src/api-natives.h"
#include "src/api.h"
#include "src/isolate-inl.h"
#include "src/lookup.h"
#include "src/messages.h"
namespace v8 {
namespace internal {
namespace {
MaybeHandle<JSObject> InstantiateObject(Isolate* isolate,
Handle<ObjectTemplateInfo> data);
MaybeHandle<JSFunction> InstantiateFunction(Isolate* isolate,
Handle<FunctionTemplateInfo> data,
Handle<Name> name = Handle<Name>());
MaybeHandle<Object> Instantiate(Isolate* isolate, Handle<Object> data,
Handle<Name> name = Handle<Name>()) {
if (data->IsFunctionTemplateInfo()) {
return InstantiateFunction(isolate,
Handle<FunctionTemplateInfo>::cast(data), name);
} else if (data->IsObjectTemplateInfo()) {
return InstantiateObject(isolate, Handle<ObjectTemplateInfo>::cast(data));
} else {
return data;
}
}
MaybeHandle<Object> DefineAccessorProperty(Isolate* isolate,
Handle<JSObject> object,
Handle<Name> name,
Handle<Object> getter,
Handle<Object> setter,
PropertyAttributes attributes) {
if (!getter->IsUndefined()) {
ASSIGN_RETURN_ON_EXCEPTION(
isolate, getter,
InstantiateFunction(isolate,
Handle<FunctionTemplateInfo>::cast(getter)),
Object);
}
if (!setter->IsUndefined()) {
ASSIGN_RETURN_ON_EXCEPTION(
isolate, setter,
InstantiateFunction(isolate,
Handle<FunctionTemplateInfo>::cast(setter)),
Object);
}
RETURN_ON_EXCEPTION(isolate, JSObject::DefineAccessor(object, name, getter,
setter, attributes),
Object);
return object;
}
MaybeHandle<Object> DefineDataProperty(Isolate* isolate,
Handle<JSObject> object,
Handle<Name> name,
Handle<Object> prop_data,
PropertyAttributes attributes) {
Handle<Object> value;
ASSIGN_RETURN_ON_EXCEPTION(isolate, value,
Instantiate(isolate, prop_data, name), Object);
LookupIterator it = LookupIterator::PropertyOrElement(
isolate, object, name, LookupIterator::OWN_SKIP_INTERCEPTOR);
#ifdef DEBUG
Maybe<PropertyAttributes> maybe = JSReceiver::GetPropertyAttributes(&it);
DCHECK(maybe.IsJust());
if (it.IsFound()) {
THROW_NEW_ERROR(
isolate,
NewTypeError(MessageTemplate::kDuplicateTemplateProperty, name),
Object);
}
#endif
MAYBE_RETURN_NULL(
Object::AddDataProperty(&it, value, attributes, Object::THROW_ON_ERROR,
Object::CERTAINLY_NOT_STORE_FROM_KEYED));
return value;
}
void DisableAccessChecks(Isolate* isolate, Handle<JSObject> object) {
Handle<Map> old_map(object->map());
// Copy map so it won't interfere constructor's initial map.
Handle<Map> new_map = Map::Copy(old_map, "DisableAccessChecks");
new_map->set_is_access_check_needed(false);
JSObject::MigrateToMap(Handle<JSObject>::cast(object), new_map);
}
void EnableAccessChecks(Isolate* isolate, Handle<JSObject> object) {
Handle<Map> old_map(object->map());
// Copy map so it won't interfere constructor's initial map.
Handle<Map> new_map = Map::Copy(old_map, "EnableAccessChecks");
new_map->set_is_access_check_needed(true);
JSObject::MigrateToMap(object, new_map);
}
class AccessCheckDisableScope {
public:
AccessCheckDisableScope(Isolate* isolate, Handle<JSObject> obj)
: isolate_(isolate),
disabled_(obj->map()->is_access_check_needed()),
obj_(obj) {
if (disabled_) {
DisableAccessChecks(isolate_, obj_);
}
}
~AccessCheckDisableScope() {
if (disabled_) {
EnableAccessChecks(isolate_, obj_);
}
}
private:
Isolate* isolate_;
const bool disabled_;
Handle<JSObject> obj_;
};
Object* GetIntrinsic(Isolate* isolate, v8::Intrinsic intrinsic) {
Handle<Context> native_context = isolate->native_context();
DCHECK(!native_context.is_null());
switch (intrinsic) {
#define GET_INTRINSIC_VALUE(name, iname) \
case v8::k##name: \
return native_context->iname();
V8_INTRINSICS_LIST(GET_INTRINSIC_VALUE)
#undef GET_INTRINSIC_VALUE
}
return nullptr;
}
MaybeHandle<JSObject> ConfigureInstance(Isolate* isolate, Handle<JSObject> obj,
Handle<TemplateInfo> data) {
auto property_list = handle(data->property_list(), isolate);
if (property_list->IsUndefined()) return obj;
// TODO(dcarney): just use a FixedArray here.
NeanderArray properties(property_list);
if (properties.length() == 0) return obj;
HandleScope scope(isolate);
// Disable access checks while instantiating the object.
AccessCheckDisableScope access_check_scope(isolate, obj);
int i = 0;
for (int c = 0; c < data->number_of_properties(); c++) {
auto name = handle(Name::cast(properties.get(i++)), isolate);
auto bit = handle(properties.get(i++), isolate);
if (bit->IsSmi()) {
PropertyDetails details(Smi::cast(*bit));
PropertyAttributes attributes = details.attributes();
PropertyKind kind = details.kind();
if (kind == kData) {
auto prop_data = handle(properties.get(i++), isolate);
RETURN_ON_EXCEPTION(isolate, DefineDataProperty(isolate, obj, name,
prop_data, attributes),
JSObject);
} else {
auto getter = handle(properties.get(i++), isolate);
auto setter = handle(properties.get(i++), isolate);
RETURN_ON_EXCEPTION(isolate,
DefineAccessorProperty(isolate, obj, name, getter,
setter, attributes),
JSObject);
}
} else {
// Intrinsic data property --- Get appropriate value from the current
// context.
PropertyDetails details(Smi::cast(properties.get(i++)));
PropertyAttributes attributes = details.attributes();
DCHECK_EQ(kData, details.kind());
v8::Intrinsic intrinsic =
static_cast<v8::Intrinsic>(Smi::cast(properties.get(i++))->value());
auto prop_data = handle(GetIntrinsic(isolate, intrinsic), isolate);
RETURN_ON_EXCEPTION(isolate, DefineDataProperty(isolate, obj, name,
prop_data, attributes),
JSObject);
}
}
return obj;
}
MaybeHandle<JSObject> InstantiateObject(Isolate* isolate,
Handle<ObjectTemplateInfo> data) {
// Enter a new scope. Recursion could otherwise create a lot of handles.
HandleScope scope(isolate);
// Fast path.
Handle<JSObject> result;
auto info = Handle<ObjectTemplateInfo>::cast(data);
auto constructor = handle(info->constructor(), isolate);
Handle<JSFunction> cons;
if (constructor->IsUndefined()) {
cons = isolate->object_function();
} else {
auto cons_templ = Handle<FunctionTemplateInfo>::cast(constructor);
ASSIGN_RETURN_ON_EXCEPTION(
isolate, cons, InstantiateFunction(isolate, cons_templ), JSFunction);
}
auto object = isolate->factory()->NewJSObject(cons);
ASSIGN_RETURN_ON_EXCEPTION(
isolate, result, ConfigureInstance(isolate, object, info), JSFunction);
// TODO(dcarney): is this necessary?
JSObject::MigrateSlowToFast(result, 0, "ApiNatives::InstantiateObject");
return scope.CloseAndEscape(result);
}
void CacheFunction(Isolate* isolate, Handle<Smi> serial_number,
Handle<JSFunction> function) {
auto cache = isolate->function_cache();
auto new_cache = ObjectHashTable::Put(cache, serial_number, function);
isolate->native_context()->set_function_cache(*new_cache);
}
void UncacheFunction(Isolate* isolate, Handle<Smi> serial_number) {
auto cache = isolate->function_cache();
bool was_present = false;
auto new_cache = ObjectHashTable::Remove(cache, serial_number, &was_present);
DCHECK(was_present);
isolate->native_context()->set_function_cache(*new_cache);
}
MaybeHandle<JSFunction> InstantiateFunction(Isolate* isolate,
Handle<FunctionTemplateInfo> data,
Handle<Name> name) {
auto serial_number = handle(Smi::cast(data->serial_number()), isolate);
// Probe cache.
if (!data->do_not_cache()) {
auto cache = isolate->function_cache();
Object* element = cache->Lookup(serial_number);
if (element->IsJSFunction()) {
return handle(JSFunction::cast(element), isolate);
}
}
// Enter a new scope. Recursion could otherwise create a lot of handles.
HandleScope scope(isolate);
Handle<JSObject> prototype;
if (!data->remove_prototype()) {
auto prototype_templ = handle(data->prototype_template(), isolate);
if (prototype_templ->IsUndefined()) {
prototype = isolate->factory()->NewJSObject(isolate->object_function());
} else {
ASSIGN_RETURN_ON_EXCEPTION(
isolate, prototype,
InstantiateObject(isolate,
Handle<ObjectTemplateInfo>::cast(prototype_templ)),
JSFunction);
}
auto parent = handle(data->parent_template(), isolate);
if (!parent->IsUndefined()) {
Handle<JSFunction> parent_instance;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, parent_instance,
InstantiateFunction(isolate,
Handle<FunctionTemplateInfo>::cast(parent)),
JSFunction);
// TODO(dcarney): decide what to do here.
Handle<Object> parent_prototype;
ASSIGN_RETURN_ON_EXCEPTION(
isolate, parent_prototype,
JSObject::GetProperty(parent_instance,
isolate->factory()->prototype_string()),
JSFunction);
MAYBE_RETURN(JSObject::SetPrototype(prototype, parent_prototype, false,
Object::THROW_ON_ERROR),
MaybeHandle<JSFunction>());
}
}
auto function = ApiNatives::CreateApiFunction(
isolate, data, prototype, ApiNatives::JavaScriptObjectType);
if (!name.is_null() && name->IsString()) {
function->shared()->set_name(*name);
}
if (!data->do_not_cache()) {
// Cache the function.
CacheFunction(isolate, serial_number, function);
}
auto result = ConfigureInstance(isolate, function, data);
if (result.is_null()) {
// Uncache on error.
if (!data->do_not_cache()) {
UncacheFunction(isolate, serial_number);
}
return MaybeHandle<JSFunction>();
}
return scope.CloseAndEscape(function);
}
class InvokeScope {
public:
explicit InvokeScope(Isolate* isolate)
: isolate_(isolate), save_context_(isolate) {}
~InvokeScope() {
bool has_exception = isolate_->has_pending_exception();
if (has_exception) {
isolate_->ReportPendingMessages();
} else {
isolate_->clear_pending_message();
}
}
private:
Isolate* isolate_;
SaveContext save_context_;
};
void AddPropertyToPropertyList(Isolate* isolate, Handle<TemplateInfo> templ,
int length, Handle<Object>* data) {
auto list = handle(templ->property_list(), isolate);
if (list->IsUndefined()) {
list = NeanderArray(isolate).value();
templ->set_property_list(*list);
}
templ->set_number_of_properties(templ->number_of_properties() + 1);
NeanderArray array(list);
for (int i = 0; i < length; i++) {
Handle<Object> value =
data[i].is_null()
? Handle<Object>::cast(isolate->factory()->undefined_value())
: data[i];
array.add(isolate, value);
}
}
} // namespace
MaybeHandle<JSFunction> ApiNatives::InstantiateFunction(
Handle<FunctionTemplateInfo> data) {
Isolate* isolate = data->GetIsolate();
InvokeScope invoke_scope(isolate);
return ::v8::internal::InstantiateFunction(isolate, data);
}
MaybeHandle<JSObject> ApiNatives::InstantiateObject(
Handle<ObjectTemplateInfo> data) {
Isolate* isolate = data->GetIsolate();
InvokeScope invoke_scope(isolate);
return ::v8::internal::InstantiateObject(isolate, data);
}
MaybeHandle<FunctionTemplateInfo> ApiNatives::ConfigureInstance(
Isolate* isolate, Handle<FunctionTemplateInfo> desc,
Handle<JSObject> instance) {
// Configure the instance by adding the properties specified by the
// instance template.
if (desc->instance_template()->IsUndefined()) return desc;
InvokeScope invoke_scope(isolate);
Handle<ObjectTemplateInfo> instance_template(
ObjectTemplateInfo::cast(desc->instance_template()), isolate);
RETURN_ON_EXCEPTION(isolate, ::v8::internal::ConfigureInstance(
isolate, instance, instance_template),
FunctionTemplateInfo);
return desc;
}
void ApiNatives::AddDataProperty(Isolate* isolate, Handle<TemplateInfo> info,
Handle<Name> name, Handle<Object> value,
PropertyAttributes attributes) {
const int kSize = 3;
PropertyDetails details(attributes, DATA, 0, PropertyCellType::kNoCell);
auto details_handle = handle(details.AsSmi(), isolate);
Handle<Object> data[kSize] = {name, details_handle, value};
AddPropertyToPropertyList(isolate, info, kSize, data);
}
void ApiNatives::AddDataProperty(Isolate* isolate, Handle<TemplateInfo> info,
Handle<Name> name, v8::Intrinsic intrinsic,
PropertyAttributes attributes) {
const int kSize = 4;
auto value = handle(Smi::FromInt(intrinsic), isolate);
auto intrinsic_marker = isolate->factory()->true_value();
PropertyDetails details(attributes, DATA, 0, PropertyCellType::kNoCell);
auto details_handle = handle(details.AsSmi(), isolate);
Handle<Object> data[kSize] = {name, intrinsic_marker, details_handle, value};
AddPropertyToPropertyList(isolate, info, kSize, data);
}
void ApiNatives::AddAccessorProperty(Isolate* isolate,
Handle<TemplateInfo> info,
Handle<Name> name,
Handle<FunctionTemplateInfo> getter,
Handle<FunctionTemplateInfo> setter,
PropertyAttributes attributes) {
const int kSize = 4;
PropertyDetails details(attributes, ACCESSOR, 0, PropertyCellType::kNoCell);
auto details_handle = handle(details.AsSmi(), isolate);
Handle<Object> data[kSize] = {name, details_handle, getter, setter};
AddPropertyToPropertyList(isolate, info, kSize, data);
}
void ApiNatives::AddNativeDataProperty(Isolate* isolate,
Handle<TemplateInfo> info,
Handle<AccessorInfo> property) {
auto list = handle(info->property_accessors(), isolate);
if (list->IsUndefined()) {
list = NeanderArray(isolate).value();
info->set_property_accessors(*list);
}
NeanderArray array(list);
array.add(isolate, property);
}
Handle<JSFunction> ApiNatives::CreateApiFunction(
Isolate* isolate, Handle<FunctionTemplateInfo> obj,
Handle<Object> prototype, ApiInstanceType instance_type) {
Handle<Code> code = isolate->builtins()->HandleApiCall();
Handle<Code> construct_stub = isolate->builtins()->JSConstructStubApi();
obj->set_instantiated(true);
Handle<JSFunction> result;
if (obj->remove_prototype()) {
result = isolate->factory()->NewFunctionWithoutPrototype(
isolate->factory()->empty_string(), code);
} else {
int internal_field_count = 0;
if (!obj->instance_template()->IsUndefined()) {
Handle<ObjectTemplateInfo> instance_template = Handle<ObjectTemplateInfo>(
ObjectTemplateInfo::cast(obj->instance_template()));
internal_field_count =
Smi::cast(instance_template->internal_field_count())->value();
}
// TODO(svenpanne) Kill ApiInstanceType and refactor things by generalizing
// JSObject::GetHeaderSize.
int instance_size = kPointerSize * internal_field_count;
InstanceType type;
switch (instance_type) {
case JavaScriptObjectType:
type = JS_OBJECT_TYPE;
instance_size += JSObject::kHeaderSize;
break;
case GlobalObjectType:
type = JS_GLOBAL_OBJECT_TYPE;
instance_size += JSGlobalObject::kSize;
break;
case GlobalProxyType:
type = JS_GLOBAL_PROXY_TYPE;
instance_size += JSGlobalProxy::kSize;
break;
default:
UNREACHABLE();
type = JS_OBJECT_TYPE; // Keep the compiler happy.
break;
}
result = isolate->factory()->NewFunction(
isolate->factory()->empty_string(), code, prototype, type,
instance_size, obj->read_only_prototype(), true);
}
result->shared()->set_length(obj->length());
Handle<Object> class_name(obj->class_name(), isolate);
if (class_name->IsString()) {
result->shared()->set_instance_class_name(*class_name);
result->shared()->set_name(*class_name);
}
result->shared()->set_function_data(*obj);
result->shared()->set_construct_stub(*construct_stub);
result->shared()->DontAdaptArguments();
if (obj->remove_prototype()) {
DCHECK(result->shared()->IsApiFunction());
DCHECK(!result->has_initial_map());
DCHECK(!result->has_prototype());
return result;
}
#ifdef DEBUG
LookupIterator it(handle(JSObject::cast(result->prototype())),
isolate->factory()->constructor_string(),
LookupIterator::OWN_SKIP_INTERCEPTOR);
MaybeHandle<Object> maybe_prop = Object::GetProperty(&it);
DCHECK(it.IsFound());
DCHECK(maybe_prop.ToHandleChecked().is_identical_to(result));
#endif
// Down from here is only valid for API functions that can be used as a
// constructor (don't set the "remove prototype" flag).
Handle<Map> map(result->initial_map());
// Mark as undetectable if needed.
if (obj->undetectable()) {
map->set_is_undetectable();
}
// Mark as hidden for the __proto__ accessor if needed.
if (obj->hidden_prototype()) {
map->set_is_hidden_prototype();
}
// Mark as needs_access_check if needed.
if (obj->needs_access_check()) {
map->set_is_access_check_needed(true);
}
// Set interceptor information in the map.
if (!obj->named_property_handler()->IsUndefined()) {
map->set_has_named_interceptor();
}
if (!obj->indexed_property_handler()->IsUndefined()) {
map->set_has_indexed_interceptor();
}
// Mark instance as callable in the map.
if (!obj->instance_call_handler()->IsUndefined()) {
map->set_is_callable();
map->set_is_constructor(true);
}
// Recursively copy parent instance templates' accessors,
// 'data' may be modified.
int max_number_of_additional_properties = 0;
int max_number_of_static_properties = 0;
FunctionTemplateInfo* info = *obj;
while (true) {
if (!info->instance_template()->IsUndefined()) {
Object* props = ObjectTemplateInfo::cast(info->instance_template())
->property_accessors();
if (!props->IsUndefined()) {
Handle<Object> props_handle(props, isolate);
NeanderArray props_array(props_handle);
max_number_of_additional_properties += props_array.length();
}
}
if (!info->property_accessors()->IsUndefined()) {
Object* props = info->property_accessors();
if (!props->IsUndefined()) {
Handle<Object> props_handle(props, isolate);
NeanderArray props_array(props_handle);
max_number_of_static_properties += props_array.length();
}
}
Object* parent = info->parent_template();
if (parent->IsUndefined()) break;
info = FunctionTemplateInfo::cast(parent);
}
Map::EnsureDescriptorSlack(map, max_number_of_additional_properties);
// Use a temporary FixedArray to acculumate static accessors
int valid_descriptors = 0;
Handle<FixedArray> array;
if (max_number_of_static_properties > 0) {
array = isolate->factory()->NewFixedArray(max_number_of_static_properties);
}
while (true) {
// Install instance descriptors
if (!obj->instance_template()->IsUndefined()) {
Handle<ObjectTemplateInfo> instance = Handle<ObjectTemplateInfo>(
ObjectTemplateInfo::cast(obj->instance_template()), isolate);
Handle<Object> props =
Handle<Object>(instance->property_accessors(), isolate);
if (!props->IsUndefined()) {
Map::AppendCallbackDescriptors(map, props);
}
}
// Accumulate static accessors
if (!obj->property_accessors()->IsUndefined()) {
Handle<Object> props = Handle<Object>(obj->property_accessors(), isolate);
valid_descriptors =
AccessorInfo::AppendUnique(props, array, valid_descriptors);
}
// Climb parent chain
Handle<Object> parent = Handle<Object>(obj->parent_template(), isolate);
if (parent->IsUndefined()) break;
obj = Handle<FunctionTemplateInfo>::cast(parent);
}
// Install accumulated static accessors
for (int i = 0; i < valid_descriptors; i++) {
Handle<AccessorInfo> accessor(AccessorInfo::cast(array->get(i)));
JSObject::SetAccessor(result, accessor).Assert();
}
DCHECK(result->shared()->IsApiFunction());
return result;
}
} // namespace internal
} // namespace v8
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