blob: 8b33b7c326b090c7a2849cc67d59e993ef06306a [file] [log] [blame]
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// Copyright 2018 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/compiler/js-heap-broker.h"
#include "src/common/globals.h"
#include "src/compiler/heap-refs.h"
#ifdef ENABLE_SLOW_DCHECKS
#include <algorithm>
#endif
#include "include/v8-fast-api-calls.h"
#include "src/api/api-inl.h"
#include "src/ast/modules.h"
#include "src/codegen/code-factory.h"
#include "src/codegen/optimized-compilation-info.h"
#include "src/compiler/access-info.h"
#include "src/compiler/bytecode-analysis.h"
#include "src/compiler/graph-reducer.h"
#include "src/compiler/per-isolate-compiler-cache.h"
#include "src/execution/protectors-inl.h"
#include "src/init/bootstrapper.h"
#include "src/objects/allocation-site-inl.h"
#include "src/objects/api-callbacks.h"
#include "src/objects/cell-inl.h"
#include "src/objects/heap-number-inl.h"
#include "src/objects/instance-type-inl.h"
#include "src/objects/js-array-buffer-inl.h"
#include "src/objects/js-array-inl.h"
#include "src/objects/js-regexp-inl.h"
#include "src/objects/literal-objects-inl.h"
#include "src/objects/module-inl.h"
#include "src/objects/objects-inl.h"
#include "src/objects/template-objects-inl.h"
#include "src/objects/templates.h"
#include "src/utils/utils.h"
namespace v8 {
namespace internal {
namespace compiler {
#define TRACE(broker, x) TRACE_BROKER(broker, x)
#define TRACE_MISSING(broker, x) TRACE_BROKER_MISSING(broker, x)
#define FORWARD_DECL(Name) class Name##Data;
HEAP_BROKER_SERIALIZED_OBJECT_LIST(FORWARD_DECL)
// TODO(solanes, v8:10866): Remove once FLAG_turbo_direct_heap_access is
// removed.
HEAP_BROKER_NEVER_SERIALIZED_OBJECT_LIST(FORWARD_DECL)
#undef FORWARD_DECL
// There are three kinds of ObjectData values.
//
// kSmi: The underlying V8 object is a Smi and the data is an instance of the
// base class (ObjectData), i.e. it's basically just the handle. Because the
// object is a Smi, it's safe to access the handle in order to extract the
// number value, and AsSmi() does exactly that.
//
// kSerializedHeapObject: The underlying V8 object is a HeapObject and the
// data is an instance of the corresponding (most-specific) subclass, e.g.
// JSFunctionData, which provides serialized information about the object.
//
// kUnserializedHeapObject: The underlying V8 object is a HeapObject and the
// data is an instance of the base class (ObjectData), i.e. it basically
// carries no information other than the handle.
//
// kUnserializedReadOnlyHeapObject: The underlying V8 object is a read-only
// HeapObject and the data is an instance of ObjectData. For
// ReadOnlyHeapObjects, it is OK to access heap even from off-thread, so
// these objects need not be serialized.
enum ObjectDataKind {
kSmi,
kSerializedHeapObject,
kUnserializedHeapObject,
kNeverSerializedHeapObject,
kUnserializedReadOnlyHeapObject
};
class AllowHandleAllocationIfNeeded {
public:
explicit AllowHandleAllocationIfNeeded(ObjectDataKind kind,
JSHeapBroker::BrokerMode mode,
bool direct_heap_access = false) {
DCHECK_IMPLIES(mode == JSHeapBroker::BrokerMode::kSerialized,
kind == kUnserializedReadOnlyHeapObject ||
kind == kNeverSerializedHeapObject ||
(direct_heap_access && kind == kSerializedHeapObject));
if (kind == kUnserializedHeapObject) maybe_allow_handle_.emplace();
}
private:
base::Optional<AllowHandleAllocation> maybe_allow_handle_;
};
class AllowHandleDereferenceIfNeeded {
public:
explicit AllowHandleDereferenceIfNeeded(ObjectDataKind kind,
JSHeapBroker::BrokerMode mode,
bool direct_heap_access = false)
: AllowHandleDereferenceIfNeeded(kind) {
DCHECK_IMPLIES(mode == JSHeapBroker::BrokerMode::kSerialized,
kind == kUnserializedReadOnlyHeapObject ||
kind == kNeverSerializedHeapObject ||
(direct_heap_access && kind == kSerializedHeapObject));
}
explicit AllowHandleDereferenceIfNeeded(ObjectDataKind kind) {
if (kind == kUnserializedHeapObject ||
kind == kUnserializedReadOnlyHeapObject) {
maybe_allow_handle_.emplace();
}
}
private:
base::Optional<AllowHandleDereference> maybe_allow_handle_;
};
class AllowHeapAllocationIfNeeded {
public:
explicit AllowHeapAllocationIfNeeded(ObjectDataKind kind,
JSHeapBroker::BrokerMode mode) {
DCHECK_IMPLIES(mode == JSHeapBroker::BrokerMode::kSerialized,
kind == kUnserializedReadOnlyHeapObject);
if (kind == kUnserializedHeapObject) maybe_allow_handle_.emplace();
}
private:
base::Optional<AllowHeapAllocation> maybe_allow_handle_;
};
namespace {
bool IsReadOnlyHeapObject(Object object) {
DisallowHeapAllocation no_gc;
return (object.IsCode() && Code::cast(object).is_builtin()) ||
(object.IsHeapObject() &&
ReadOnlyHeap::Contains(HeapObject::cast(object)));
}
} // namespace
class ObjectData : public ZoneObject {
public:
ObjectData(JSHeapBroker* broker, ObjectData** storage, Handle<Object> object,
ObjectDataKind kind)
: object_(object), kind_(kind) {
// This assignment ensures we don't end up inserting the same object
// in an endless recursion.
*storage = this;
TRACE(broker, "Creating data " << this << " for handle " << object.address()
<< " (" << Brief(*object) << ")");
// It is safe to access read only heap objects and builtins from a
// background thread. When we read fileds of these objects, we may create
// ObjectData on the background thread even without a canonical handle
// scope. This is safe too since we don't create handles but just get
// handles from read only root table or builtins table which is what
// canonical scope uses as well. For all other objects we should have
// created ObjectData in canonical handle scope on the main thread.
CHECK_IMPLIES(
broker->mode() == JSHeapBroker::kDisabled ||
broker->mode() == JSHeapBroker::kSerializing,
broker->isolate()->handle_scope_data()->canonical_scope != nullptr);
CHECK_IMPLIES(broker->mode() == JSHeapBroker::kSerialized,
(kind == kUnserializedReadOnlyHeapObject &&
IsReadOnlyHeapObject(*object)) ||
kind == kNeverSerializedHeapObject);
}
#define DECLARE_IS(Name) bool Is##Name() const;
HEAP_BROKER_SERIALIZED_OBJECT_LIST(DECLARE_IS)
HEAP_BROKER_NEVER_SERIALIZED_OBJECT_LIST(DECLARE_IS)
#undef DECLARE_IS
#define DECLARE_AS(Name) Name##Data* As##Name();
HEAP_BROKER_SERIALIZED_OBJECT_LIST(DECLARE_AS)
// TODO(solanes, v8:10866): Remove once FLAG_turbo_direct_heap_access is
// removed.
HEAP_BROKER_NEVER_SERIALIZED_OBJECT_LIST(DECLARE_AS)
#undef DECLARE_AS
Handle<Object> object() const { return object_; }
ObjectDataKind kind() const { return kind_; }
bool is_smi() const { return kind_ == kSmi; }
bool should_access_heap() const {
return kind_ == kUnserializedHeapObject ||
kind_ == kNeverSerializedHeapObject ||
kind_ == kUnserializedReadOnlyHeapObject;
}
#ifdef DEBUG
enum class Usage{kUnused, kOnlyIdentityUsed, kDataUsed};
mutable Usage used_status = Usage::kUnused;
#endif // DEBUG
private:
Handle<Object> const object_;
ObjectDataKind const kind_;
};
class HeapObjectData : public ObjectData {
public:
HeapObjectData(JSHeapBroker* broker, ObjectData** storage,
Handle<HeapObject> object);
bool boolean_value() const { return boolean_value_; }
ObjectData* map() const { return map_; }
InstanceType GetMapInstanceType() const;
static HeapObjectData* Serialize(JSHeapBroker* broker,
Handle<HeapObject> object);
private:
bool const boolean_value_;
ObjectData* const map_;
};
class PropertyCellData : public HeapObjectData {
public:
PropertyCellData(JSHeapBroker* broker, ObjectData** storage,
Handle<PropertyCell> object);
PropertyDetails property_details() const { return property_details_; }
void Serialize(JSHeapBroker* broker);
ObjectData* value() const { return value_; }
private:
PropertyDetails const property_details_;
ObjectData* value_ = nullptr;
};
// TODO(mslekova): Once we have real-world usage data, we might want to
// reimplement this as sorted vector instead, to reduce the memory overhead.
typedef ZoneMap<ObjectData*, HolderLookupResult> KnownReceiversMap;
class FunctionTemplateInfoData : public HeapObjectData {
public:
FunctionTemplateInfoData(JSHeapBroker* broker, ObjectData** storage,
Handle<FunctionTemplateInfo> object);
bool is_signature_undefined() const { return is_signature_undefined_; }
bool accept_any_receiver() const { return accept_any_receiver_; }
bool has_call_code() const { return has_call_code_; }
void SerializeCallCode(JSHeapBroker* broker);
ObjectData* call_code() const { return call_code_; }
Address c_function() const { return c_function_; }
const CFunctionInfo* c_signature() const { return c_signature_; }
KnownReceiversMap& known_receivers() { return known_receivers_; }
private:
bool is_signature_undefined_ = false;
bool accept_any_receiver_ = false;
bool has_call_code_ = false;
ObjectData* call_code_ = nullptr;
const Address c_function_;
const CFunctionInfo* const c_signature_;
KnownReceiversMap known_receivers_;
};
class CallHandlerInfoData : public HeapObjectData {
public:
CallHandlerInfoData(JSHeapBroker* broker, ObjectData** storage,
Handle<CallHandlerInfo> object);
Address callback() const { return callback_; }
void Serialize(JSHeapBroker* broker);
ObjectData* data() const { return data_; }
private:
Address const callback_;
ObjectData* data_ = nullptr;
};
FunctionTemplateInfoData::FunctionTemplateInfoData(
JSHeapBroker* broker, ObjectData** storage,
Handle<FunctionTemplateInfo> object)
: HeapObjectData(broker, storage, object),
c_function_(v8::ToCData<Address>(object->GetCFunction())),
c_signature_(v8::ToCData<CFunctionInfo*>(object->GetCSignature())),
known_receivers_(broker->zone()) {
auto function_template_info = Handle<FunctionTemplateInfo>::cast(object);
is_signature_undefined_ =
function_template_info->signature().IsUndefined(broker->isolate());
accept_any_receiver_ = function_template_info->accept_any_receiver();
CallOptimization call_optimization(broker->isolate(), object);
has_call_code_ = call_optimization.is_simple_api_call();
}
CallHandlerInfoData::CallHandlerInfoData(JSHeapBroker* broker,
ObjectData** storage,
Handle<CallHandlerInfo> object)
: HeapObjectData(broker, storage, object),
callback_(v8::ToCData<Address>(object->callback())) {}
// These definitions are here in order to please the linker, which in debug mode
// sometimes requires static constants to be defined in .cc files.
const uint32_t JSHeapBroker::kMinimalRefsBucketCount;
const uint32_t JSHeapBroker::kInitialRefsBucketCount;
void JSHeapBroker::IncrementTracingIndentation() { ++trace_indentation_; }
void JSHeapBroker::DecrementTracingIndentation() { --trace_indentation_; }
PropertyCellData::PropertyCellData(JSHeapBroker* broker, ObjectData** storage,
Handle<PropertyCell> object)
: HeapObjectData(broker, storage, object),
property_details_(object->property_details()) {}
void PropertyCellData::Serialize(JSHeapBroker* broker) {
if (value_ != nullptr) return;
TraceScope tracer(broker, this, "PropertyCellData::Serialize");
auto cell = Handle<PropertyCell>::cast(object());
value_ = broker->GetOrCreateData(cell->value());
}
void FunctionTemplateInfoData::SerializeCallCode(JSHeapBroker* broker) {
if (call_code_ != nullptr) return;
TraceScope tracer(broker, this,
"FunctionTemplateInfoData::SerializeCallCode");
auto function_template_info = Handle<FunctionTemplateInfo>::cast(object());
call_code_ = broker->GetOrCreateData(function_template_info->call_code());
if (!call_code_->should_access_heap()) {
call_code_->AsCallHandlerInfo()->Serialize(broker);
}
}
void CallHandlerInfoData::Serialize(JSHeapBroker* broker) {
if (data_ != nullptr) return;
TraceScope tracer(broker, this, "CallHandlerInfoData::Serialize");
auto call_handler_info = Handle<CallHandlerInfo>::cast(object());
data_ = broker->GetOrCreateData(call_handler_info->data());
}
class JSObjectField {
public:
bool IsDouble() const { return object_ == nullptr; }
uint64_t AsBitsOfDouble() const {
CHECK(IsDouble());
return number_bits_;
}
double AsDouble() const {
CHECK(IsDouble());
return bit_cast<double>(number_bits_);
}
bool IsObject() const { return object_ != nullptr; }
ObjectData* AsObject() const {
CHECK(IsObject());
return object_;
}
explicit JSObjectField(uint64_t value_bits) : number_bits_(value_bits) {}
explicit JSObjectField(ObjectData* value) : object_(value) {}
private:
ObjectData* object_ = nullptr;
uint64_t number_bits_ = 0;
};
class JSReceiverData : public HeapObjectData {
public:
JSReceiverData(JSHeapBroker* broker, ObjectData** storage,
Handle<JSReceiver> object)
: HeapObjectData(broker, storage, object) {}
};
class JSObjectData : public JSReceiverData {
public:
JSObjectData(JSHeapBroker* broker, ObjectData** storage,
Handle<JSObject> object);
// Recursive serialization of all reachable JSObjects.
void SerializeAsBoilerplate(JSHeapBroker* broker);
const JSObjectField& GetInobjectField(int property_index) const;
// Shallow serialization of {elements}.
void SerializeElements(JSHeapBroker* broker);
bool serialized_elements() const { return serialized_elements_; }
ObjectData* elements() const;
void SerializeObjectCreateMap(JSHeapBroker* broker);
ObjectData* object_create_map(
JSHeapBroker* broker) const { // Can be nullptr.
if (!serialized_object_create_map_) {
DCHECK_NULL(object_create_map_);
TRACE_MISSING(broker, "object_create_map on " << this);
}
return object_create_map_;
}
ObjectData* GetOwnConstantElement(
JSHeapBroker* broker, uint32_t index,
SerializationPolicy policy = SerializationPolicy::kAssumeSerialized);
ObjectData* GetOwnDataProperty(
JSHeapBroker* broker, Representation representation,
FieldIndex field_index,
SerializationPolicy policy = SerializationPolicy::kAssumeSerialized);
// This method is only used to assert our invariants.
bool cow_or_empty_elements_tenured() const;
private:
void SerializeRecursiveAsBoilerplate(JSHeapBroker* broker, int max_depths);
ObjectData* elements_ = nullptr;
bool cow_or_empty_elements_tenured_ = false;
// The {serialized_as_boilerplate} flag is set when all recursively
// reachable JSObjects are serialized.
bool serialized_as_boilerplate_ = false;
bool serialized_elements_ = false;
ZoneVector<JSObjectField> inobject_fields_;
bool serialized_object_create_map_ = false;
ObjectData* object_create_map_ = nullptr;
// Elements (indexed properties) that either
// (1) are known to exist directly on the object as non-writable and
// non-configurable, or (2) are known not to (possibly they don't exist at
// all). In case (2), the second pair component is nullptr.
ZoneVector<std::pair<uint32_t, ObjectData*>> own_constant_elements_;
// Properties that either:
// (1) are known to exist directly on the object, or
// (2) are known not to (possibly they don't exist at all).
// In case (2), the second pair component is nullptr.
// For simplicity, this may in theory overlap with inobject_fields_.
// The keys of the map are the property_index() values of the
// respective property FieldIndex'es.
ZoneUnorderedMap<int, ObjectData*> own_properties_;
};
void JSObjectData::SerializeObjectCreateMap(JSHeapBroker* broker) {
if (serialized_object_create_map_) return;
serialized_object_create_map_ = true;
TraceScope tracer(broker, this, "JSObjectData::SerializeObjectCreateMap");
Handle<JSObject> jsobject = Handle<JSObject>::cast(object());
if (jsobject->map().is_prototype_map()) {
Handle<Object> maybe_proto_info(jsobject->map().prototype_info(),
broker->isolate());
if (maybe_proto_info->IsPrototypeInfo()) {
auto proto_info = Handle<PrototypeInfo>::cast(maybe_proto_info);
if (proto_info->HasObjectCreateMap()) {
DCHECK_NULL(object_create_map_);
object_create_map_ =
broker->GetOrCreateData(proto_info->ObjectCreateMap());
}
}
}
}
namespace {
base::Optional<ObjectRef> GetOwnElementFromHeap(JSHeapBroker* broker,
Handle<Object> receiver,
uint32_t index,
bool constant_only) {
LookupIterator it(broker->isolate(), receiver, index, LookupIterator::OWN);
if (it.state() == LookupIterator::DATA &&
(!constant_only || (it.IsReadOnly() && !it.IsConfigurable()))) {
return ObjectRef(broker,
broker->CanonicalPersistentHandle(it.GetDataValue()));
}
return base::nullopt;
}
ObjectRef GetOwnDataPropertyFromHeap(JSHeapBroker* broker,
Handle<JSObject> receiver,
Representation representation,
FieldIndex field_index) {
Handle<Object> constant =
JSObject::FastPropertyAt(receiver, representation, field_index);
return ObjectRef(broker, constant);
}
} // namespace
ObjectData* JSObjectData::GetOwnConstantElement(JSHeapBroker* broker,
uint32_t index,
SerializationPolicy policy) {
for (auto const& p : own_constant_elements_) {
if (p.first == index) return p.second;
}
if (policy == SerializationPolicy::kAssumeSerialized) {
TRACE_MISSING(broker, "knowledge about index " << index << " on " << this);
return nullptr;
}
base::Optional<ObjectRef> element =
GetOwnElementFromHeap(broker, object(), index, true);
ObjectData* result = element.has_value() ? element->data() : nullptr;
own_constant_elements_.push_back({index, result});
return result;
}
ObjectData* JSObjectData::GetOwnDataProperty(JSHeapBroker* broker,
Representation representation,
FieldIndex field_index,
SerializationPolicy policy) {
auto p = own_properties_.find(field_index.property_index());
if (p != own_properties_.end()) return p->second;
if (policy == SerializationPolicy::kAssumeSerialized) {
TRACE_MISSING(broker, "knowledge about property with index "
<< field_index.property_index() << " on "
<< this);
return nullptr;
}
ObjectRef property = GetOwnDataPropertyFromHeap(
broker, Handle<JSObject>::cast(object()), representation, field_index);
ObjectData* result(property.data());
own_properties_.insert(std::make_pair(field_index.property_index(), result));
return result;
}
class JSTypedArrayData : public JSObjectData {
public:
JSTypedArrayData(JSHeapBroker* broker, ObjectData** storage,
Handle<JSTypedArray> object);
bool is_on_heap() const { return is_on_heap_; }
size_t length() const { return length_; }
void* data_ptr() const { return data_ptr_; }
void Serialize(JSHeapBroker* broker);
bool serialized() const { return serialized_; }
ObjectData* buffer() const { return buffer_; }
private:
bool const is_on_heap_;
size_t const length_;
void* const data_ptr_;
bool serialized_ = false;
ObjectData* buffer_ = nullptr;
};
JSTypedArrayData::JSTypedArrayData(JSHeapBroker* broker, ObjectData** storage,
Handle<JSTypedArray> object)
: JSObjectData(broker, storage, object),
is_on_heap_(object->is_on_heap()),
length_(object->length()),
data_ptr_(object->DataPtr()) {}
void JSTypedArrayData::Serialize(JSHeapBroker* broker) {
if (serialized_) return;
serialized_ = true;
TraceScope tracer(broker, this, "JSTypedArrayData::Serialize");
Handle<JSTypedArray> typed_array = Handle<JSTypedArray>::cast(object());
if (!is_on_heap()) {
DCHECK_NULL(buffer_);
buffer_ = broker->GetOrCreateData(typed_array->buffer());
}
}
class ArrayBoilerplateDescriptionData : public HeapObjectData {
public:
ArrayBoilerplateDescriptionData(JSHeapBroker* broker, ObjectData** storage,
Handle<ArrayBoilerplateDescription> object)
: HeapObjectData(broker, storage, object),
constants_elements_length_(object->constant_elements().length()) {
DCHECK(!FLAG_turbo_direct_heap_access);
}
int constants_elements_length() const { return constants_elements_length_; }
private:
int const constants_elements_length_;
};
class ObjectBoilerplateDescriptionData : public HeapObjectData {
public:
ObjectBoilerplateDescriptionData(JSHeapBroker* broker, ObjectData** storage,
Handle<ObjectBoilerplateDescription> object)
: HeapObjectData(broker, storage, object), size_(object->size()) {
DCHECK(!FLAG_turbo_direct_heap_access);
}
int size() const { return size_; }
private:
int const size_;
};
class JSDataViewData : public JSObjectData {
public:
JSDataViewData(JSHeapBroker* broker, ObjectData** storage,
Handle<JSDataView> object);
size_t byte_length() const { return byte_length_; }
private:
size_t const byte_length_;
};
class JSBoundFunctionData : public JSObjectData {
public:
JSBoundFunctionData(JSHeapBroker* broker, ObjectData** storage,
Handle<JSBoundFunction> object);
void Serialize(JSHeapBroker* broker);
bool serialized() const { return serialized_; }
ObjectData* bound_target_function() const { return bound_target_function_; }
ObjectData* bound_this() const { return bound_this_; }
ObjectData* bound_arguments() const { return bound_arguments_; }
private:
bool serialized_ = false;
ObjectData* bound_target_function_ = nullptr;
ObjectData* bound_this_ = nullptr;
ObjectData* bound_arguments_ = nullptr;
};
class JSFunctionData : public JSObjectData {
public:
JSFunctionData(JSHeapBroker* broker, ObjectData** storage,
Handle<JSFunction> object);
bool has_feedback_vector() const { return has_feedback_vector_; }
bool has_initial_map() const { return has_initial_map_; }
bool has_prototype() const { return has_prototype_; }
bool HasAttachedOptimizedCode() const { return has_attached_optimized_code_; }
bool PrototypeRequiresRuntimeLookup() const {
return PrototypeRequiresRuntimeLookup_;
}
void Serialize(JSHeapBroker* broker);
bool serialized() const { return serialized_; }
ObjectData* context() const { return context_; }
ObjectData* native_context() const { return native_context_; }
ObjectData* initial_map() const { return initial_map_; }
ObjectData* prototype() const { return prototype_; }
ObjectData* shared() const { return shared_; }
ObjectData* feedback_vector() const { return feedback_vector_; }
ObjectData* code() const { return code_; }
int initial_map_instance_size_with_min_slack() const {
CHECK(serialized_);
return initial_map_instance_size_with_min_slack_;
}
private:
bool has_feedback_vector_;
bool has_initial_map_;
bool has_prototype_;
bool has_attached_optimized_code_;
bool PrototypeRequiresRuntimeLookup_;
bool serialized_ = false;
ObjectData* context_ = nullptr;
ObjectData* native_context_ = nullptr;
ObjectData* initial_map_ = nullptr;
ObjectData* prototype_ = nullptr;
ObjectData* shared_ = nullptr;
ObjectData* feedback_vector_ = nullptr;
ObjectData* code_ = nullptr;
int initial_map_instance_size_with_min_slack_;
};
class JSRegExpData : public JSObjectData {
public:
JSRegExpData(JSHeapBroker* broker, ObjectData** storage,
Handle<JSRegExp> object)
: JSObjectData(broker, storage, object) {}
void SerializeAsRegExpBoilerplate(JSHeapBroker* broker);
ObjectData* raw_properties_or_hash() const { return raw_properties_or_hash_; }
ObjectData* data() const { return data_; }
ObjectData* source() const { return source_; }
ObjectData* flags() const { return flags_; }
ObjectData* last_index() const { return last_index_; }
private:
bool serialized_as_reg_exp_boilerplate_ = false;
ObjectData* raw_properties_or_hash_ = nullptr;
ObjectData* data_ = nullptr;
ObjectData* source_ = nullptr;
ObjectData* flags_ = nullptr;
ObjectData* last_index_ = nullptr;
};
class HeapNumberData : public HeapObjectData {
public:
HeapNumberData(JSHeapBroker* broker, ObjectData** storage,
Handle<HeapNumber> object)
: HeapObjectData(broker, storage, object), value_(object->value()) {
DCHECK(!FLAG_turbo_direct_heap_access);
}
double value() const { return value_; }
private:
double const value_;
};
class ContextData : public HeapObjectData {
public:
ContextData(JSHeapBroker* broker, ObjectData** storage,
Handle<Context> object);
ObjectData* previous(
JSHeapBroker* broker,
SerializationPolicy policy = SerializationPolicy::kAssumeSerialized);
// Returns nullptr if the slot index isn't valid or wasn't serialized,
// unless {policy} is {kSerializeIfNeeded}.
ObjectData* GetSlot(
JSHeapBroker* broker, int index,
SerializationPolicy policy = SerializationPolicy::kAssumeSerialized);
private:
ZoneMap<int, ObjectData*> slots_;
ObjectData* previous_ = nullptr;
};
ContextData::ContextData(JSHeapBroker* broker, ObjectData** storage,
Handle<Context> object)
: HeapObjectData(broker, storage, object), slots_(broker->zone()) {}
ObjectData* ContextData::previous(JSHeapBroker* broker,
SerializationPolicy policy) {
if (policy == SerializationPolicy::kSerializeIfNeeded &&
previous_ == nullptr) {
TraceScope tracer(broker, this, "ContextData::previous");
Handle<Context> context = Handle<Context>::cast(object());
previous_ = broker->GetOrCreateData(context->unchecked_previous());
}
return previous_;
}
ObjectData* ContextData::GetSlot(JSHeapBroker* broker, int index,
SerializationPolicy policy) {
CHECK_GE(index, 0);
auto search = slots_.find(index);
if (search != slots_.end()) {
return search->second;
}
if (policy == SerializationPolicy::kSerializeIfNeeded) {
Handle<Context> context = Handle<Context>::cast(object());
if (index < context->length()) {
TraceScope tracer(broker, this, "ContextData::GetSlot");
TRACE(broker, "Serializing context slot " << index);
ObjectData* odata = broker->GetOrCreateData(context->get(index));
slots_.insert(std::make_pair(index, odata));
return odata;
}
}
return nullptr;
}
class NativeContextData : public ContextData {
public:
#define DECL_ACCESSOR(type, name) \
ObjectData* name() const { return name##_; }
BROKER_NATIVE_CONTEXT_FIELDS(DECL_ACCESSOR)
#undef DECL_ACCESSOR
const ZoneVector<ObjectData*>& function_maps() const {
CHECK(serialized_);
return function_maps_;
}
ObjectData* scope_info() const {
CHECK(serialized_);
return scope_info_;
}
NativeContextData(JSHeapBroker* broker, ObjectData** storage,
Handle<NativeContext> object);
void Serialize(JSHeapBroker* broker);
private:
bool serialized_ = false;
#define DECL_MEMBER(type, name) ObjectData* name##_ = nullptr;
BROKER_NATIVE_CONTEXT_FIELDS(DECL_MEMBER)
#undef DECL_MEMBER
ZoneVector<ObjectData*> function_maps_;
ObjectData* scope_info_ = nullptr;
};
class NameData : public HeapObjectData {
public:
NameData(JSHeapBroker* broker, ObjectData** storage, Handle<Name> object)
: HeapObjectData(broker, storage, object) {}
};
class StringData : public NameData {
public:
StringData(JSHeapBroker* broker, ObjectData** storage, Handle<String> object);
int length() const { return length_; }
uint16_t first_char() const { return first_char_; }
base::Optional<double> to_number() const { return to_number_; }
bool is_external_string() const { return is_external_string_; }
bool is_seq_string() const { return is_seq_string_; }
ObjectData* GetCharAsString(
JSHeapBroker* broker, uint32_t index,
SerializationPolicy policy = SerializationPolicy::kAssumeSerialized);
private:
int const length_;
uint16_t const first_char_;
base::Optional<double> to_number_;
bool const is_external_string_;
bool const is_seq_string_;
// Known individual characters as strings, corresponding to the semantics of
// element access (s[i]). The first pair component is always less than
// {length_}. The second component is never nullptr.
ZoneVector<std::pair<uint32_t, ObjectData*>> chars_as_strings_;
static constexpr int kMaxLengthForDoubleConversion = 23;
};
class SymbolData : public NameData {
public:
SymbolData(JSHeapBroker* broker, ObjectData** storage, Handle<Symbol> object)
: NameData(broker, storage, object) {
DCHECK(!FLAG_turbo_direct_heap_access);
}
};
StringData::StringData(JSHeapBroker* broker, ObjectData** storage,
Handle<String> object)
: NameData(broker, storage, object),
length_(object->length()),
first_char_(length_ > 0 ? object->Get(0) : 0),
is_external_string_(object->IsExternalString()),
is_seq_string_(object->IsSeqString()),
chars_as_strings_(broker->zone()) {
if (length_ <= kMaxLengthForDoubleConversion) {
const int flags = ALLOW_HEX | ALLOW_OCTAL | ALLOW_BINARY;
uc16 buffer[kMaxLengthForDoubleConversion];
String::WriteToFlat(*object, buffer, 0, length_);
Vector<const uc16> v(buffer, length_);
to_number_ = StringToDouble(v, flags);
}
}
class InternalizedStringData : public StringData {
public:
InternalizedStringData(JSHeapBroker* broker, ObjectData** storage,
Handle<InternalizedString> object);
uint32_t array_index() const { return array_index_; }
private:
uint32_t array_index_;
};
ObjectData* StringData::GetCharAsString(JSHeapBroker* broker, uint32_t index,
SerializationPolicy policy) {
if (index >= static_cast<uint32_t>(length())) return nullptr;
for (auto const& p : chars_as_strings_) {
if (p.first == index) return p.second;
}
if (policy == SerializationPolicy::kAssumeSerialized) {
TRACE_MISSING(broker, "knowledge about index " << index << " on " << this);
return nullptr;
}
base::Optional<ObjectRef> element =
GetOwnElementFromHeap(broker, object(), index, true);
ObjectData* result = element.has_value() ? element->data() : nullptr;
chars_as_strings_.push_back({index, result});
return result;
}
InternalizedStringData::InternalizedStringData(
JSHeapBroker* broker, ObjectData** storage,
Handle<InternalizedString> object)
: StringData(broker, storage, object) {}
namespace {
bool IsFastLiteralHelper(Handle<JSObject> boilerplate, int max_depth,
int* max_properties) {
DCHECK_GE(max_depth, 0);
DCHECK_GE(*max_properties, 0);
Isolate* const isolate = boilerplate->GetIsolate();
// Make sure the boilerplate map is not deprecated.
if (!JSObject::TryMigrateInstance(isolate, boilerplate)) return false;
// Check for too deep nesting.
if (max_depth == 0) return false;
// Check the elements.
Handle<FixedArrayBase> elements(boilerplate->elements(), isolate);
if (elements->length() > 0 &&
elements->map() != ReadOnlyRoots(isolate).fixed_cow_array_map()) {
if (boilerplate->HasSmiOrObjectElements()) {
Handle<FixedArray> fast_elements = Handle<FixedArray>::cast(elements);
int length = elements->length();
for (int i = 0; i < length; i++) {
if ((*max_properties)-- == 0) return false;
Handle<Object> value(fast_elements->get(i), isolate);
if (value->IsJSObject()) {
Handle<JSObject> value_object = Handle<JSObject>::cast(value);
if (!IsFastLiteralHelper(value_object, max_depth - 1,
max_properties)) {
return false;
}
}
}
} else if (boilerplate->HasDoubleElements()) {
if (elements->Size() > kMaxRegularHeapObjectSize) return false;
} else {
return false;
}
}
// TODO(turbofan): Do we want to support out-of-object properties?
if (!(boilerplate->HasFastProperties() &&
boilerplate->property_array().length() == 0)) {
return false;
}
// Check the in-object properties.
Handle<DescriptorArray> descriptors(boilerplate->map().instance_descriptors(),
isolate);
for (InternalIndex i : boilerplate->map().IterateOwnDescriptors()) {
PropertyDetails details = descriptors->GetDetails(i);
if (details.location() != kField) continue;
DCHECK_EQ(kData, details.kind());
if ((*max_properties)-- == 0) return false;
FieldIndex field_index = FieldIndex::ForDescriptor(boilerplate->map(), i);
if (boilerplate->IsUnboxedDoubleField(field_index)) continue;
Handle<Object> value(boilerplate->RawFastPropertyAt(field_index), isolate);
if (value->IsJSObject()) {
Handle<JSObject> value_object = Handle<JSObject>::cast(value);
if (!IsFastLiteralHelper(value_object, max_depth - 1, max_properties)) {
return false;
}
}
}
return true;
}
// Maximum depth and total number of elements and properties for literal
// graphs to be considered for fast deep-copying. The limit is chosen to
// match the maximum number of inobject properties, to ensure that the
// performance of using object literals is not worse than using constructor
// functions, see crbug.com/v8/6211 for details.
const int kMaxFastLiteralDepth = 3;
const int kMaxFastLiteralProperties = JSObject::kMaxInObjectProperties;
// Determines whether the given array or object literal boilerplate satisfies
// all limits to be considered for fast deep-copying and computes the total
// size of all objects that are part of the graph.
bool IsInlinableFastLiteral(Handle<JSObject> boilerplate) {
int max_properties = kMaxFastLiteralProperties;
return IsFastLiteralHelper(boilerplate, kMaxFastLiteralDepth,
&max_properties);
}
} // namespace
class AccessorInfoData : public HeapObjectData {
public:
AccessorInfoData(JSHeapBroker* broker, ObjectData** storage,
Handle<AccessorInfo> object);
};
class AllocationSiteData : public HeapObjectData {
public:
AllocationSiteData(JSHeapBroker* broker, ObjectData** storage,
Handle<AllocationSite> object);
void SerializeBoilerplate(JSHeapBroker* broker);
bool PointsToLiteral() const { return PointsToLiteral_; }
AllocationType GetAllocationType() const { return GetAllocationType_; }
ObjectData* nested_site() const { return nested_site_; }
bool IsFastLiteral() const { return IsFastLiteral_; }
ObjectData* boilerplate() const { return boilerplate_; }
// These are only valid if PointsToLiteral is false.
ElementsKind GetElementsKind() const { return GetElementsKind_; }
bool CanInlineCall() const { return CanInlineCall_; }
private:
bool const PointsToLiteral_;
AllocationType const GetAllocationType_;
ObjectData* nested_site_ = nullptr;
bool IsFastLiteral_ = false;
ObjectData* boilerplate_ = nullptr;
ElementsKind GetElementsKind_ = NO_ELEMENTS;
bool CanInlineCall_ = false;
bool serialized_boilerplate_ = false;
};
class BigIntData : public HeapObjectData {
public:
BigIntData(JSHeapBroker* broker, ObjectData** storage, Handle<BigInt> object)
: HeapObjectData(broker, storage, object),
as_uint64_(object->AsUint64(nullptr)) {
DCHECK(!FLAG_turbo_direct_heap_access);
}
uint64_t AsUint64() const { return as_uint64_; }
private:
const uint64_t as_uint64_;
};
// Only used in JSNativeContextSpecialization.
class ScriptContextTableData : public HeapObjectData {
public:
ScriptContextTableData(JSHeapBroker* broker, ObjectData** storage,
Handle<ScriptContextTable> object)
: HeapObjectData(broker, storage, object) {}
};
struct PropertyDescriptor {
ObjectData* key = nullptr;
ObjectData* value = nullptr;
PropertyDetails details = PropertyDetails::Empty();
FieldIndex field_index;
ObjectData* field_owner = nullptr;
ObjectData* field_type = nullptr;
bool is_unboxed_double_field = false;
};
class MapData : public HeapObjectData {
public:
MapData(JSHeapBroker* broker, ObjectData** storage, Handle<Map> object);
InstanceType instance_type() const { return instance_type_; }
int instance_size() const { return instance_size_; }
byte bit_field() const { return bit_field_; }
byte bit_field2() const { return bit_field2_; }
uint32_t bit_field3() const { return bit_field3_; }
bool can_be_deprecated() const { return can_be_deprecated_; }
bool can_transition() const { return can_transition_; }
int in_object_properties_start_in_words() const {
CHECK(InstanceTypeChecker::IsJSObject(instance_type()));
return in_object_properties_start_in_words_;
}
int in_object_properties() const {
CHECK(InstanceTypeChecker::IsJSObject(instance_type()));
return in_object_properties_;
}
int constructor_function_index() const { return constructor_function_index_; }
int NextFreePropertyIndex() const { return next_free_property_index_; }
int UnusedPropertyFields() const { return unused_property_fields_; }
bool supports_fast_array_iteration() const {
return supports_fast_array_iteration_;
}
bool supports_fast_array_resize() const {
return supports_fast_array_resize_;
}
bool is_abandoned_prototype_map() const {
return is_abandoned_prototype_map_;
}
// Extra information.
void SerializeElementsKindGeneralizations(JSHeapBroker* broker);
const ZoneVector<ObjectData*>& elements_kind_generalizations() const {
CHECK(serialized_elements_kind_generalizations_);
return elements_kind_generalizations_;
}
// Serialize a single (or all) own slot(s) of the descriptor array and recurse
// on field owner(s).
void SerializeOwnDescriptor(JSHeapBroker* broker,
InternalIndex descriptor_index);
void SerializeOwnDescriptors(JSHeapBroker* broker);
ObjectData* GetStrongValue(InternalIndex descriptor_index) const;
// TODO(neis): This code needs to be changed to allow for ObjectData* instance
// descriptors. However, this is likely to require a non-trivial refactoring
// of how maps are serialized because actual instance descriptors don't
// contain information about owner maps.
DescriptorArrayData* instance_descriptors() const {
return instance_descriptors_;
}
void SerializeRootMap(JSHeapBroker* broker);
ObjectData* FindRootMap() const;
void SerializeConstructor(JSHeapBroker* broker);
ObjectData* GetConstructor() const {
CHECK(serialized_constructor_);
return constructor_;
}
void SerializeBackPointer(JSHeapBroker* broker);
ObjectData* GetBackPointer() const {
CHECK(serialized_backpointer_);
return backpointer_;
}
void SerializePrototype(JSHeapBroker* broker);
bool serialized_prototype() const { return serialized_prototype_; }
ObjectData* prototype() const {
CHECK(serialized_prototype_);
return prototype_;
}
void SerializeForElementLoad(JSHeapBroker* broker);
void SerializeForElementStore(JSHeapBroker* broker);
private:
InstanceType const instance_type_;
int const instance_size_;
byte const bit_field_;
byte const bit_field2_;
uint32_t const bit_field3_;
bool const can_be_deprecated_;
bool const can_transition_;
int const in_object_properties_start_in_words_;
int const in_object_properties_;
int const constructor_function_index_;
int const next_free_property_index_;
int const unused_property_fields_;
bool const supports_fast_array_iteration_;
bool const supports_fast_array_resize_;
bool const is_abandoned_prototype_map_;
bool serialized_elements_kind_generalizations_ = false;
ZoneVector<ObjectData*> elements_kind_generalizations_;
bool serialized_own_descriptors_ = false;
DescriptorArrayData* instance_descriptors_ = nullptr;
bool serialized_constructor_ = false;
ObjectData* constructor_ = nullptr;
bool serialized_backpointer_ = false;
ObjectData* backpointer_ = nullptr;
bool serialized_prototype_ = false;
ObjectData* prototype_ = nullptr;
bool serialized_root_map_ = false;
ObjectData* root_map_ = nullptr;
bool serialized_for_element_load_ = false;
bool serialized_for_element_store_ = false;
};
AccessorInfoData::AccessorInfoData(JSHeapBroker* broker, ObjectData** storage,
Handle<AccessorInfo> object)
: HeapObjectData(broker, storage, object) {
DCHECK(!FLAG_turbo_direct_heap_access);
}
AllocationSiteData::AllocationSiteData(JSHeapBroker* broker,
ObjectData** storage,
Handle<AllocationSite> object)
: HeapObjectData(broker, storage, object),
PointsToLiteral_(object->PointsToLiteral()),
GetAllocationType_(object->GetAllocationType()) {
if (PointsToLiteral_) {
IsFastLiteral_ = IsInlinableFastLiteral(
handle(object->boilerplate(), broker->isolate()));
} else {
GetElementsKind_ = object->GetElementsKind();
CanInlineCall_ = object->CanInlineCall();
}
}
void AllocationSiteData::SerializeBoilerplate(JSHeapBroker* broker) {
if (serialized_boilerplate_) return;
serialized_boilerplate_ = true;
TraceScope tracer(broker, this, "AllocationSiteData::SerializeBoilerplate");
Handle<AllocationSite> site = Handle<AllocationSite>::cast(object());
CHECK(IsFastLiteral_);
DCHECK_NULL(boilerplate_);
boilerplate_ = broker->GetOrCreateData(site->boilerplate());
if (!boilerplate_->should_access_heap()) {
boilerplate_->AsJSObject()->SerializeAsBoilerplate(broker);
}
DCHECK_NULL(nested_site_);
nested_site_ = broker->GetOrCreateData(site->nested_site());
if (nested_site_->IsAllocationSite() && !nested_site_->should_access_heap()) {
nested_site_->AsAllocationSite()->SerializeBoilerplate(broker);
}
}
HeapObjectData::HeapObjectData(JSHeapBroker* broker, ObjectData** storage,
Handle<HeapObject> object)
: ObjectData(broker, storage, object, kSerializedHeapObject),
boolean_value_(object->BooleanValue(broker->isolate())),
// We have to use a raw cast below instead of AsMap() because of
// recursion. AsMap() would call IsMap(), which accesses the
// instance_type_ member. In the case of constructing the MapData for the
// meta map (whose map is itself), this member has not yet been
// initialized.
map_(broker->GetOrCreateData(object->map())) {
CHECK_EQ(broker->mode(), JSHeapBroker::kSerializing);
}
InstanceType HeapObjectData::GetMapInstanceType() const {
ObjectData* map_data = map();
if (map_data->should_access_heap()) {
AllowHandleDereferenceIfNeeded allow_handle_dereference(kind());
return Handle<Map>::cast(map_data->object())->instance_type();
}
return map_data->AsMap()->instance_type();
}
namespace {
bool IsReadOnlyLengthDescriptor(Isolate* isolate, Handle<Map> jsarray_map) {
DCHECK(!jsarray_map->is_dictionary_map());
Handle<Name> length_string = isolate->factory()->length_string();
DescriptorArray descriptors = jsarray_map->instance_descriptors();
// TODO(jkummerow): We could skip the search and hardcode number == 0.
InternalIndex number = descriptors.Search(*length_string, *jsarray_map);
DCHECK(number.is_found());
return descriptors.GetDetails(number).IsReadOnly();
}
bool SupportsFastArrayIteration(Isolate* isolate, Handle<Map> map) {
return map->instance_type() == JS_ARRAY_TYPE &&
IsFastElementsKind(map->elements_kind()) &&
map->prototype().IsJSArray() &&
isolate->IsAnyInitialArrayPrototype(
handle(JSArray::cast(map->prototype()), isolate)) &&
Protectors::IsNoElementsIntact(isolate);
}
bool SupportsFastArrayResize(Isolate* isolate, Handle<Map> map) {
return SupportsFastArrayIteration(isolate, map) && map->is_extensible() &&
!map->is_dictionary_map() && !IsReadOnlyLengthDescriptor(isolate, map);
}
} // namespace
MapData::MapData(JSHeapBroker* broker, ObjectData** storage, Handle<Map> object)
: HeapObjectData(broker, storage, object),
instance_type_(object->instance_type()),
instance_size_(object->instance_size()),
bit_field_(object->bit_field()),
bit_field2_(object->bit_field2()),
bit_field3_(object->bit_field3()),
can_be_deprecated_(object->NumberOfOwnDescriptors() > 0
? object->CanBeDeprecated()
: false),
can_transition_(object->CanTransition()),
in_object_properties_start_in_words_(
object->IsJSObjectMap() ? object->GetInObjectPropertiesStartInWords()
: 0),
in_object_properties_(
object->IsJSObjectMap() ? object->GetInObjectProperties() : 0),
constructor_function_index_(object->IsPrimitiveMap()
? object->GetConstructorFunctionIndex()
: Map::kNoConstructorFunctionIndex),
next_free_property_index_(object->NextFreePropertyIndex()),
unused_property_fields_(object->UnusedPropertyFields()),
supports_fast_array_iteration_(
SupportsFastArrayIteration(broker->isolate(), object)),
supports_fast_array_resize_(
SupportsFastArrayResize(broker->isolate(), object)),
is_abandoned_prototype_map_(object->is_abandoned_prototype_map()),
elements_kind_generalizations_(broker->zone()) {}
JSFunctionData::JSFunctionData(JSHeapBroker* broker, ObjectData** storage,
Handle<JSFunction> object)
: JSObjectData(broker, storage, object),
has_feedback_vector_(object->has_feedback_vector()),
has_initial_map_(object->has_prototype_slot() &&
object->has_initial_map()),
has_prototype_(object->has_prototype_slot() && object->has_prototype()),
has_attached_optimized_code_(object->HasAttachedOptimizedCode()),
PrototypeRequiresRuntimeLookup_(
object->PrototypeRequiresRuntimeLookup()) {}
void JSFunctionData::Serialize(JSHeapBroker* broker) {
if (serialized_) return;
serialized_ = true;
TraceScope tracer(broker, this, "JSFunctionData::Serialize");
Handle<JSFunction> function = Handle<JSFunction>::cast(object());
DCHECK_NULL(context_);
DCHECK_NULL(native_context_);
DCHECK_NULL(initial_map_);
DCHECK_NULL(prototype_);
DCHECK_NULL(shared_);
DCHECK_NULL(feedback_vector_);
DCHECK_NULL(code_);
context_ = broker->GetOrCreateData(function->context());
native_context_ = broker->GetOrCreateData(function->native_context());
shared_ = broker->GetOrCreateData(function->shared());
feedback_vector_ = has_feedback_vector()
? broker->GetOrCreateData(function->feedback_vector())
: nullptr;
code_ = broker->GetOrCreateData(function->code());
initial_map_ = has_initial_map()
? broker->GetOrCreateData(function->initial_map())
: nullptr;
prototype_ = has_prototype() ? broker->GetOrCreateData(function->prototype())
: nullptr;
if (initial_map_ != nullptr) {
initial_map_instance_size_with_min_slack_ =
function->ComputeInstanceSizeWithMinSlack(broker->isolate());
}
if (initial_map_ != nullptr && !initial_map_->should_access_heap()) {
if (initial_map_->AsMap()->instance_type() == JS_ARRAY_TYPE) {
initial_map_->AsMap()->SerializeElementsKindGeneralizations(broker);
}
initial_map_->AsMap()->SerializeConstructor(broker);
// TODO(neis): This is currently only needed for native_context's
// object_function, as used by GetObjectCreateMap. If no further use sites
// show up, we should move this into NativeContextData::Serialize.
initial_map_->AsMap()->SerializePrototype(broker);
}
}
void MapData::SerializeElementsKindGeneralizations(JSHeapBroker* broker) {
if (serialized_elements_kind_generalizations_) return;
serialized_elements_kind_generalizations_ = true;
TraceScope tracer(broker, this,
"MapData::SerializeElementsKindGeneralizations");
DCHECK_EQ(instance_type(), JS_ARRAY_TYPE);
MapRef self(broker, this);
ElementsKind from_kind = self.elements_kind();
DCHECK(elements_kind_generalizations_.empty());
for (int i = FIRST_FAST_ELEMENTS_KIND; i <= LAST_FAST_ELEMENTS_KIND; i++) {
ElementsKind to_kind = static_cast<ElementsKind>(i);
if (IsMoreGeneralElementsKindTransition(from_kind, to_kind)) {
Handle<Map> target =
Map::AsElementsKind(broker->isolate(), self.object(), to_kind);
elements_kind_generalizations_.push_back(broker->GetOrCreateData(target));
}
}
}
class DescriptorArrayData : public HeapObjectData {
public:
DescriptorArrayData(JSHeapBroker* broker, ObjectData** storage,
Handle<DescriptorArray> object)
: HeapObjectData(broker, storage, object), contents_(broker->zone()) {}
ZoneMap<int, PropertyDescriptor>& contents() { return contents_; }
private:
ZoneMap<int, PropertyDescriptor> contents_;
};
class FeedbackCellData : public HeapObjectData {
public:
FeedbackCellData(JSHeapBroker* broker, ObjectData** storage,
Handle<FeedbackCell> object);
ObjectData* value() const { return value_; }
private:
ObjectData* const value_;
};
FeedbackCellData::FeedbackCellData(JSHeapBroker* broker, ObjectData** storage,
Handle<FeedbackCell> object)
: HeapObjectData(broker, storage, object),
value_(broker->GetOrCreateData(object->value())) {}
class FeedbackVectorData : public HeapObjectData {
public:
FeedbackVectorData(JSHeapBroker* broker, ObjectData** storage,
Handle<FeedbackVector> object);
double invocation_count() const { return invocation_count_; }
ObjectData* shared_function_info() {
CHECK(serialized_);
return shared_function_info_;
}
void Serialize(JSHeapBroker* broker);
bool serialized() const { return serialized_; }
ObjectData* GetClosureFeedbackCell(JSHeapBroker* broker, int index) const;
private:
double const invocation_count_;
bool serialized_ = false;
ObjectData* shared_function_info_;
ZoneVector<ObjectData*> closure_feedback_cell_array_;
};
FeedbackVectorData::FeedbackVectorData(JSHeapBroker* broker,
ObjectData** storage,
Handle<FeedbackVector> object)
: HeapObjectData(broker, storage, object),
invocation_count_(object->invocation_count()),
closure_feedback_cell_array_(broker->zone()) {}
ObjectData* FeedbackVectorData::GetClosureFeedbackCell(JSHeapBroker* broker,
int index) const {
CHECK_GE(index, 0);
size_t cell_array_size = closure_feedback_cell_array_.size();
if (!serialized_) {
DCHECK_EQ(cell_array_size, 0);
TRACE_BROKER_MISSING(broker,
" closure feedback cell array for vector " << this);
return nullptr;
}
CHECK_LT(index, cell_array_size);
return closure_feedback_cell_array_[index];
}
void FeedbackVectorData::Serialize(JSHeapBroker* broker) {
if (serialized_) return;
serialized_ = true;
TraceScope tracer(broker, this, "FeedbackVectorData::Serialize");
Handle<FeedbackVector> vector = Handle<FeedbackVector>::cast(object());
Handle<SharedFunctionInfo> sfi(vector->shared_function_info(),
broker->isolate());
shared_function_info_ = broker->GetOrCreateData(sfi);
DCHECK(closure_feedback_cell_array_.empty());
int length = vector->closure_feedback_cell_array().length();
closure_feedback_cell_array_.reserve(length);
for (int i = 0; i < length; ++i) {
Handle<FeedbackCell> cell = vector->GetClosureFeedbackCell(i);
ObjectData* cell_data = broker->GetOrCreateData(cell);
closure_feedback_cell_array_.push_back(cell_data);
}
TRACE(broker, "Copied " << length << " feedback cells");
}
class FixedArrayBaseData : public HeapObjectData {
public:
FixedArrayBaseData(JSHeapBroker* broker, ObjectData** storage,
Handle<FixedArrayBase> object)
: HeapObjectData(broker, storage, object), length_(object->length()) {}
int length() const { return length_; }
private:
int const length_;
};
class FixedArrayData : public FixedArrayBaseData {
public:
FixedArrayData(JSHeapBroker* broker, ObjectData** storage,
Handle<FixedArray> object);
// Creates all elements of the fixed array.
void SerializeContents(JSHeapBroker* broker);
ObjectData* Get(int i) const;
private:
bool serialized_contents_ = false;
ZoneVector<ObjectData*> contents_;
};
JSDataViewData::JSDataViewData(JSHeapBroker* broker, ObjectData** storage,
Handle<JSDataView> object)
: JSObjectData(broker, storage, object),
byte_length_(object->byte_length()) {}
JSBoundFunctionData::JSBoundFunctionData(JSHeapBroker* broker,
ObjectData** storage,
Handle<JSBoundFunction> object)
: JSObjectData(broker, storage, object) {}
void JSBoundFunctionData::Serialize(JSHeapBroker* broker) {
if (serialized_) return;
serialized_ = true;
TraceScope tracer(broker, this, "JSBoundFunctionData::Serialize");
Handle<JSBoundFunction> function = Handle<JSBoundFunction>::cast(object());
DCHECK_NULL(bound_target_function_);
bound_target_function_ =
broker->GetOrCreateData(function->bound_target_function());
if (!bound_target_function_->should_access_heap()) {
if (bound_target_function_->IsJSBoundFunction()) {
bound_target_function_->AsJSBoundFunction()->Serialize(broker);
} else if (bound_target_function_->IsJSFunction()) {
bound_target_function_->AsJSFunction()->Serialize(broker);
}
}
DCHECK_NULL(bound_arguments_);
bound_arguments_ = broker->GetOrCreateData(function->bound_arguments());
if (!bound_arguments_->should_access_heap()) {
bound_arguments_->AsFixedArray()->SerializeContents(broker);
}
DCHECK_NULL(bound_this_);
bound_this_ = broker->GetOrCreateData(function->bound_this());
}
JSObjectData::JSObjectData(JSHeapBroker* broker, ObjectData** storage,
Handle<JSObject> object)
: JSReceiverData(broker, storage, object),
inobject_fields_(broker->zone()),
own_constant_elements_(broker->zone()),
own_properties_(broker->zone()) {}
FixedArrayData::FixedArrayData(JSHeapBroker* broker, ObjectData** storage,
Handle<FixedArray> object)
: FixedArrayBaseData(broker, storage, object), contents_(broker->zone()) {}
void FixedArrayData::SerializeContents(JSHeapBroker* broker) {
if (serialized_contents_) return;
serialized_contents_ = true;
TraceScope tracer(broker, this, "FixedArrayData::SerializeContents");
Handle<FixedArray> array = Handle<FixedArray>::cast(object());
CHECK_EQ(array->length(), length());
CHECK(contents_.empty());
contents_.reserve(static_cast<size_t>(length()));
for (int i = 0; i < length(); i++) {
Handle<Object> value(array->get(i), broker->isolate());
contents_.push_back(broker->GetOrCreateData(value));
}
TRACE(broker, "Copied " << contents_.size() << " elements");
}
class FixedDoubleArrayData : public FixedArrayBaseData {
public:
FixedDoubleArrayData(JSHeapBroker* broker, ObjectData** storage,
Handle<FixedDoubleArray> object);
// Serializes all elements of the fixed array.
void SerializeContents(JSHeapBroker* broker);
Float64 Get(int i) const;
private:
bool serialized_contents_ = false;
ZoneVector<Float64> contents_;
};
FixedDoubleArrayData::FixedDoubleArrayData(JSHeapBroker* broker,
ObjectData** storage,
Handle<FixedDoubleArray> object)
: FixedArrayBaseData(broker, storage, object), contents_(broker->zone()) {
DCHECK(!FLAG_turbo_direct_heap_access);
}
void FixedDoubleArrayData::SerializeContents(JSHeapBroker* broker) {
if (serialized_contents_) return;
serialized_contents_ = true;
TraceScope tracer(broker, this, "FixedDoubleArrayData::SerializeContents");
Handle<FixedDoubleArray> self = Handle<FixedDoubleArray>::cast(object());
CHECK_EQ(self->length(), length());
CHECK(contents_.empty());
contents_.reserve(static_cast<size_t>(length()));
for (int i = 0; i < length(); i++) {
contents_.push_back(Float64::FromBits(self->get_representation(i)));
}
TRACE(broker, "Copied " << contents_.size() << " elements");
}
class BytecodeArrayData : public FixedArrayBaseData {
public:
int register_count() const { return register_count_; }
int parameter_count() const { return parameter_count_; }
interpreter::Register incoming_new_target_or_generator_register() const {
return incoming_new_target_or_generator_register_;
}
Handle<Object> GetConstantAtIndex(int index, Isolate* isolate) const {
return constant_pool_[index]->object();
}
bool IsConstantAtIndexSmi(int index) const {
return constant_pool_[index]->is_smi();
}
Smi GetConstantAtIndexAsSmi(int index) const {
return *(Handle<Smi>::cast(constant_pool_[index]->object()));
}
void SerializeForCompilation(JSHeapBroker* broker) {
if (is_serialized_for_compilation_) return;
// Convinience cast: object() is already a canonical persistent handle.
Handle<BytecodeArray> bytecodes = Handle<BytecodeArray>::cast(object());
DCHECK(constant_pool_.empty());
Handle<FixedArray> constant_pool(bytecodes->constant_pool(),
broker->isolate());
constant_pool_.reserve(constant_pool->length());
for (int i = 0; i < constant_pool->length(); i++) {
constant_pool_.push_back(broker->GetOrCreateData(constant_pool->get(i)));
}
is_serialized_for_compilation_ = true;
}
BytecodeArrayData(JSHeapBroker* broker, ObjectData** storage,
Handle<BytecodeArray> object)
: FixedArrayBaseData(broker, storage, object),
register_count_(object->register_count()),
parameter_count_(object->parameter_count()),
incoming_new_target_or_generator_register_(
object->incoming_new_target_or_generator_register()),
constant_pool_(broker->zone()) {}
private:
int const register_count_;
int const parameter_count_;
interpreter::Register const incoming_new_target_or_generator_register_;
bool is_serialized_for_compilation_ = false;
ZoneVector<ObjectData*> constant_pool_;
};
class JSArrayData : public JSObjectData {
public:
JSArrayData(JSHeapBroker* broker, ObjectData** storage,
Handle<JSArray> object);
void Serialize(JSHeapBroker* broker);
ObjectData* length() const { return length_; }
ObjectData* GetOwnElement(
JSHeapBroker* broker, uint32_t index,
SerializationPolicy policy = SerializationPolicy::kAssumeSerialized);
private:
bool serialized_ = false;
ObjectData* length_ = nullptr;
// Elements (indexed properties) that either
// (1) are known to exist directly on the object, or
// (2) are known not to (possibly they don't exist at all).
// In case (2), the second pair component is nullptr.
ZoneVector<std::pair<uint32_t, ObjectData*>> own_elements_;
};
JSArrayData::JSArrayData(JSHeapBroker* broker, ObjectData** storage,
Handle<JSArray> object)
: JSObjectData(broker, storage, object), own_elements_(broker->zone()) {}
void JSArrayData::Serialize(JSHeapBroker* broker) {
if (serialized_) return;
serialized_ = true;
TraceScope tracer(broker, this, "JSArrayData::Serialize");
Handle<JSArray> jsarray = Handle<JSArray>::cast(object());
DCHECK_NULL(length_);
length_ = broker->GetOrCreateData(jsarray->length());
}
ObjectData* JSArrayData::GetOwnElement(JSHeapBroker* broker, uint32_t index,
SerializationPolicy policy) {
for (auto const& p : own_elements_) {
if (p.first == index) return p.second;
}
if (policy == SerializationPolicy::kAssumeSerialized) {
TRACE_MISSING(broker, "knowledge about index " << index << " on " << this);
return nullptr;
}
base::Optional<ObjectRef> element =
GetOwnElementFromHeap(broker, object(), index, false);
ObjectData* result = element.has_value() ? element->data() : nullptr;
own_elements_.push_back({index, result});
return result;
}
class ScopeInfoData : public HeapObjectData {
public:
ScopeInfoData(JSHeapBroker* broker, ObjectData** storage,
Handle<ScopeInfo> object);
int context_length() const { return context_length_; }
bool has_outer_scope_info() const { return has_outer_scope_info_; }
int flags() const { return flags_; }
ObjectData* outer_scope_info() const { return outer_scope_info_; }
void SerializeScopeInfoChain(JSHeapBroker* broker);
private:
int const context_length_;
bool const has_outer_scope_info_;
int const flags_;
// Only serialized via SerializeScopeInfoChain.
ObjectData* outer_scope_info_;
};
ScopeInfoData::ScopeInfoData(JSHeapBroker* broker, ObjectData** storage,
Handle<ScopeInfo> object)
: HeapObjectData(broker, storage, object),
context_length_(object->ContextLength()),
has_outer_scope_info_(object->HasOuterScopeInfo()),
flags_(object->Flags()),
outer_scope_info_(nullptr) {}
void ScopeInfoData::SerializeScopeInfoChain(JSHeapBroker* broker) {
if (outer_scope_info_) return;
if (!has_outer_scope_info_) return;
outer_scope_info_ = broker->GetOrCreateData(
Handle<ScopeInfo>::cast(object())->OuterScopeInfo());
if (!outer_scope_info_->should_access_heap()) {
outer_scope_info_->AsScopeInfo()->SerializeScopeInfoChain(broker);
}
}
class SharedFunctionInfoData : public HeapObjectData {
public:
SharedFunctionInfoData(JSHeapBroker* broker, ObjectData** storage,
Handle<SharedFunctionInfo> object);
int builtin_id() const { return builtin_id_; }
int context_header_size() const { return context_header_size_; }
ObjectData* GetBytecodeArray() const { return GetBytecodeArray_; }
void SerializeFunctionTemplateInfo(JSHeapBroker* broker);
ObjectData* scope_info() const { return scope_info_; }
void SerializeScopeInfoChain(JSHeapBroker* broker);
ObjectData* function_template_info() const { return function_template_info_; }
ObjectData* GetTemplateObject(FeedbackSlot slot) const {
auto lookup_it = template_objects_.find(slot.ToInt());
if (lookup_it != template_objects_.cend()) {
return lookup_it->second;
}
return nullptr;
}
void SetTemplateObject(FeedbackSlot slot, ObjectData* object) {
CHECK(
template_objects_.insert(std::make_pair(slot.ToInt(), object)).second);
}
#define DECL_ACCESSOR(type, name) \
type name() const { return name##_; }
BROKER_SFI_FIELDS(DECL_ACCESSOR)
#undef DECL_ACCESSOR
private:
int const builtin_id_;
int context_header_size_;
ObjectData* const GetBytecodeArray_;
#define DECL_MEMBER(type, name) type const name##_;
BROKER_SFI_FIELDS(DECL_MEMBER)
#undef DECL_MEMBER
ObjectData* function_template_info_;
ZoneMap<int, ObjectData*> template_objects_;
ObjectData* scope_info_;
};
SharedFunctionInfoData::SharedFunctionInfoData(
JSHeapBroker* broker, ObjectData** storage,
Handle<SharedFunctionInfo> object)
: HeapObjectData(broker, storage, object),
builtin_id_(object->HasBuiltinId() ? object->builtin_id()
: Builtins::kNoBuiltinId),
context_header_size_(object->scope_info().ContextHeaderLength()),
GetBytecodeArray_(
object->HasBytecodeArray()
? broker->GetOrCreateData(object->GetBytecodeArray())
: nullptr)
#define INIT_MEMBER(type, name) , name##_(object->name())
BROKER_SFI_FIELDS(INIT_MEMBER)
#undef INIT_MEMBER
,
function_template_info_(nullptr),
template_objects_(broker->zone()),
scope_info_(nullptr) {
DCHECK_EQ(HasBuiltinId_, builtin_id_ != Builtins::kNoBuiltinId);
DCHECK_EQ(HasBytecodeArray_, GetBytecodeArray_ != nullptr);
}
void SharedFunctionInfoData::SerializeFunctionTemplateInfo(
JSHeapBroker* broker) {
if (function_template_info_) return;
function_template_info_ = broker->GetOrCreateData(
Handle<SharedFunctionInfo>::cast(object())->function_data());
}
void SharedFunctionInfoData::SerializeScopeInfoChain(JSHeapBroker* broker) {
if (scope_info_) return;
scope_info_ = broker->GetOrCreateData(
Handle<SharedFunctionInfo>::cast(object())->scope_info());
if (!scope_info_->should_access_heap()) {
scope_info_->AsScopeInfo()->SerializeScopeInfoChain(broker);
}
}
class SourceTextModuleData : public HeapObjectData {
public:
SourceTextModuleData(JSHeapBroker* broker, ObjectData** storage,
Handle<SourceTextModule> object);
void Serialize(JSHeapBroker* broker);
ObjectData* GetCell(JSHeapBroker* broker, int cell_index) const;
ObjectData* GetImportMeta(JSHeapBroker* broker) const;
private:
bool serialized_ = false;
ZoneVector<ObjectData*> imports_;
ZoneVector<ObjectData*> exports_;
ObjectData* import_meta_;
};
SourceTextModuleData::SourceTextModuleData(JSHeapBroker* broker,
ObjectData** storage,
Handle<SourceTextModule> object)
: HeapObjectData(broker, storage, object),
imports_(broker->zone()),
exports_(broker->zone()),
import_meta_(nullptr) {}
ObjectData* SourceTextModuleData::GetCell(JSHeapBroker* broker,
int cell_index) const {
if (!serialized_) {
DCHECK(imports_.empty());
TRACE_BROKER_MISSING(broker,
"module cell " << cell_index << " on " << this);
return nullptr;
}
ObjectData* cell;
switch (SourceTextModuleDescriptor::GetCellIndexKind(cell_index)) {
case SourceTextModuleDescriptor::kImport:
cell = imports_.at(SourceTextModule::ImportIndex(cell_index));
break;
case SourceTextModuleDescriptor::kExport:
cell = exports_.at(SourceTextModule::ExportIndex(cell_index));
break;
case SourceTextModuleDescriptor::kInvalid:
UNREACHABLE();
}
CHECK_NOT_NULL(cell);
return cell;
}
ObjectData* SourceTextModuleData::GetImportMeta(JSHeapBroker* broker) const {
CHECK(serialized_);
return import_meta_;
}
void SourceTextModuleData::Serialize(JSHeapBroker* broker) {
if (serialized_) return;
serialized_ = true;
TraceScope tracer(broker, this, "SourceTextModuleData::Serialize");
Handle<SourceTextModule> module = Handle<SourceTextModule>::cast(object());
// TODO(neis): We could be smarter and only serialize the cells we care about.
// TODO(neis): Define a helper for serializing a FixedArray into a ZoneVector.
DCHECK(imports_.empty());
Handle<FixedArray> imports(module->regular_imports(), broker->isolate());
int const imports_length = imports->length();
imports_.reserve(imports_length);
for (int i = 0; i < imports_length; ++i) {
imports_.push_back(broker->GetOrCreateData(imports->get(i)));
}
TRACE(broker, "Copied " << imports_.size() << " imports");
DCHECK(exports_.empty());
Handle<FixedArray> exports(module->regular_exports(), broker->isolate());
int const exports_length = exports->length();
exports_.reserve(exports_length);
for (int i = 0; i < exports_length; ++i) {
exports_.push_back(broker->GetOrCreateData(exports->get(i)));
}
TRACE(broker, "Copied " << exports_.size() << " exports");
DCHECK_NULL(import_meta_);
import_meta_ = broker->GetOrCreateData(module->import_meta());
TRACE(broker, "Copied import_meta");
}
class CellData : public HeapObjectData {
public:
CellData(JSHeapBroker* broker, ObjectData** storage, Handle<Cell> object)
: HeapObjectData(broker, storage, object) {
DCHECK(!FLAG_turbo_direct_heap_access);
}
};
class JSGlobalObjectData : public JSObjectData {
public:
JSGlobalObjectData(JSHeapBroker* broker, ObjectData** storage,
Handle<JSGlobalObject> object);
bool IsDetached() const { return is_detached_; }
ObjectData* GetPropertyCell(
JSHeapBroker* broker, ObjectData* name,
SerializationPolicy policy = SerializationPolicy::kAssumeSerialized);
private:
bool const is_detached_;
// Properties that either
// (1) are known to exist as property cells on the global object, or
// (2) are known not to (possibly they don't exist at all).
// In case (2), the second pair component is nullptr.
ZoneVector<std::pair<ObjectData*, ObjectData*>> properties_;
};
JSGlobalObjectData::JSGlobalObjectData(JSHeapBroker* broker,
ObjectData** storage,
Handle<JSGlobalObject> object)
: JSObjectData(broker, storage, object),
is_detached_(object->IsDetached()),
properties_(broker->zone()) {}
class JSGlobalProxyData : public JSObjectData {
public:
JSGlobalProxyData(JSHeapBroker* broker, ObjectData** storage,
Handle<JSGlobalProxy> object);
};
JSGlobalProxyData::JSGlobalProxyData(JSHeapBroker* broker, ObjectData** storage,
Handle<JSGlobalProxy> object)
: JSObjectData(broker, storage, object) {}
namespace {
base::Optional<PropertyCellRef> GetPropertyCellFromHeap(JSHeapBroker* broker,
Handle<Name> name) {
LookupIterator it(
broker->isolate(),
handle(broker->target_native_context().object()->global_object(),
broker->isolate()),
name, LookupIterator::OWN);
it.TryLookupCachedProperty();
if (it.state() == LookupIterator::DATA &&
it.GetHolder<JSObject>()->IsJSGlobalObject()) {
return PropertyCellRef(broker, it.GetPropertyCell());
}
return base::nullopt;
}
} // namespace
ObjectData* JSGlobalObjectData::GetPropertyCell(JSHeapBroker* broker,
ObjectData* name,
SerializationPolicy policy) {
CHECK_NOT_NULL(name);
for (auto const& p : properties_) {
if (p.first == name) return p.second;
}
if (policy == SerializationPolicy::kAssumeSerialized) {
TRACE_MISSING(broker, "knowledge about global property " << name);
return nullptr;
}
ObjectData* result = nullptr;
base::Optional<PropertyCellRef> cell =
GetPropertyCellFromHeap(broker, Handle<Name>::cast(name->object()));
if (cell.has_value()) {
result = cell->data();
if (!result->should_access_heap()) {
result->AsPropertyCell()->Serialize(broker);
}
}
properties_.push_back({name, result});
return result;
}
class TemplateObjectDescriptionData : public HeapObjectData {
public:
TemplateObjectDescriptionData(JSHeapBroker* broker, ObjectData** storage,
Handle<TemplateObjectDescription> object)
: HeapObjectData(broker, storage, object) {
DCHECK(!FLAG_turbo_direct_heap_access);
}
};
class CodeData : public HeapObjectData {
public:
CodeData(JSHeapBroker* broker, ObjectData** storage, Handle<Code> object)
: HeapObjectData(broker, storage, object),
inlined_bytecode_size_(object->inlined_bytecode_size()) {}
unsigned inlined_bytecode_size() const { return inlined_bytecode_size_; }
private:
unsigned const inlined_bytecode_size_;
};
#define DEFINE_IS(Name) \
bool ObjectData::Is##Name() const { \
if (should_access_heap()) { \
AllowHandleDereferenceIfNeeded allow_handle_dereference(kind()); \
return object()->Is##Name(); \
} \
if (is_smi()) return false; \
InstanceType instance_type = \
static_cast<const HeapObjectData*>(this)->GetMapInstanceType(); \
return InstanceTypeChecker::Is##Name(instance_type); \
}
HEAP_BROKER_SERIALIZED_OBJECT_LIST(DEFINE_IS)
HEAP_BROKER_NEVER_SERIALIZED_OBJECT_LIST(DEFINE_IS)
#undef DEFINE_IS
#define DEFINE_AS(Name) \
Name##Data* ObjectData::As##Name() { \
CHECK(Is##Name()); \
CHECK_EQ(kind_, kSerializedHeapObject); \
return static_cast<Name##Data*>(this); \
}
HEAP_BROKER_SERIALIZED_OBJECT_LIST(DEFINE_AS)
#undef DEFINE_AS
// TODO(solanes, v8:10866): Remove once FLAG_turbo_direct_heap_access is
// removed.
// This macro defines the Asxxx methods for NeverSerialized objects, which
// should only be used with direct heap access off.
#define DEFINE_AS(Name) \
Name##Data* ObjectData::As##Name() { \
DCHECK(!FLAG_turbo_direct_heap_access); \
CHECK(Is##Name()); \
CHECK_EQ(kind_, kSerializedHeapObject); \
return static_cast<Name##Data*>(this); \
}
HEAP_BROKER_NEVER_SERIALIZED_OBJECT_LIST(DEFINE_AS)
#undef DEFINE_AS
const JSObjectField& JSObjectData::GetInobjectField(int property_index) const {
CHECK_LT(static_cast<size_t>(property_index), inobject_fields_.size());
return inobject_fields_[property_index];
}
bool JSObjectData::cow_or_empty_elements_tenured() const {
return cow_or_empty_elements_tenured_;
}
ObjectData* JSObjectData::elements() const { return elements_; }
void JSObjectData::SerializeAsBoilerplate(JSHeapBroker* broker) {
SerializeRecursiveAsBoilerplate(broker, kMaxFastLiteralDepth);
}
void JSObjectData::SerializeElements(JSHeapBroker* broker) {
if (serialized_elements_) return;
serialized_elements_ = true;
TraceScope tracer(broker, this, "JSObjectData::SerializeElements");
Handle<JSObject> boilerplate = Handle<JSObject>::cast(object());
Handle<FixedArrayBase> elements_object(boilerplate->elements(),
broker->isolate());
DCHECK_NULL(elements_);
elements_ = broker->GetOrCreateData(elements_object);
DCHECK(elements_->IsFixedArrayBase());
}
void MapData::SerializeConstructor(JSHeapBroker* broker) {
if (serialized_constructor_) return;
serialized_constructor_ = true;
TraceScope tracer(broker, this, "MapData::SerializeConstructor");
Handle<Map> map = Handle<Map>::cast(object());
DCHECK(!map->IsContextMap());
DCHECK_NULL(constructor_);
constructor_ = broker->GetOrCreateData(map->GetConstructor());
}
void MapData::SerializeBackPointer(JSHeapBroker* broker) {
if (serialized_backpointer_) return;
serialized_backpointer_ = true;
TraceScope tracer(broker, this, "MapData::SerializeBackPointer");
Handle<Map> map = Handle<Map>::cast(object());
DCHECK_NULL(backpointer_);
DCHECK(!map->IsContextMap());
backpointer_ = broker->GetOrCreateData(map->GetBackPointer());
}
void MapData::SerializePrototype(JSHeapBroker* broker) {
if (serialized_prototype_) return;
serialized_prototype_ = true;
TraceScope tracer(broker, this, "MapData::SerializePrototype");
Handle<Map> map = Handle<Map>::cast(object());
DCHECK_NULL(prototype_);
prototype_ = broker->GetOrCreateData(map->prototype());
}
void MapData::SerializeOwnDescriptors(JSHeapBroker* broker) {
if (serialized_own_descriptors_) return;
serialized_own_descriptors_ = true;
TraceScope tracer(broker, this, "MapData::SerializeOwnDescriptors");
Handle<Map> map = Handle<Map>::cast(object());
for (InternalIndex i : map->IterateOwnDescriptors()) {
SerializeOwnDescriptor(broker, i);
}
}
ObjectData* MapData::GetStrongValue(InternalIndex descriptor_index) const {
auto data = instance_descriptors_->contents().find(descriptor_index.as_int());
if (data == instance_descriptors_->contents().end()) return nullptr;
return data->second.value;
}
void MapData::SerializeOwnDescriptor(JSHeapBroker* broker,
InternalIndex descriptor_index) {
TraceScope tracer(broker, this, "MapData::SerializeOwnDescriptor");
Handle<Map> map = Handle<Map>::cast(object());
if (instance_descriptors_ == nullptr) {
instance_descriptors_ = broker->GetOrCreateData(map->instance_descriptors())
->AsDescriptorArray();
}
ZoneMap<int, PropertyDescriptor>& contents =
instance_descriptors()->contents();
CHECK_LT(descriptor_index.as_int(), map->NumberOfOwnDescriptors());
if (contents.find(descriptor_index.as_int()) != contents.end()) return;
Isolate* const isolate = broker->isolate();
auto descriptors =
Handle<DescriptorArray>::cast(instance_descriptors_->object());
CHECK_EQ(*descriptors, map->instance_descriptors());
PropertyDescriptor d;
d.key = broker->GetOrCreateData(descriptors->GetKey(descriptor_index));
MaybeObject value = descriptors->GetValue(descriptor_index);
HeapObject obj;
if (value.GetHeapObjectIfStrong(&obj)) {
d.value = broker->GetOrCreateData(obj);
}
d.details = descriptors->GetDetails(descriptor_index);
if (d.details.location() == kField) {
d.field_index = FieldIndex::ForDescriptor(*map, descriptor_index);
d.field_owner =
broker->GetOrCreateData(map->FindFieldOwner(isolate, descriptor_index));
d.field_type =
broker->GetOrCreateData(descriptors->GetFieldType(descriptor_index));
d.is_unboxed_double_field = map->IsUnboxedDoubleField(d.field_index);
}
contents[descriptor_index.as_int()] = d;
if (d.details.location() == kField && !d.field_owner->should_access_heap()) {
// Recurse on the owner map.
d.field_owner->AsMap()->SerializeOwnDescriptor(broker, descriptor_index);
}
TRACE(broker, "Copied descriptor " << descriptor_index.as_int() << " into "
<< instance_descriptors_ << " ("
<< contents.size() << " total)");
}
void MapData::SerializeRootMap(JSHeapBroker* broker) {
if (serialized_root_map_) return;
serialized_root_map_ = true;
TraceScope tracer(broker, this, "MapData::SerializeRootMap");
Handle<Map> map = Handle<Map>::cast(object());
DCHECK_NULL(root_map_);
root_map_ = broker->GetOrCreateData(map->FindRootMap(broker->isolate()));
}
ObjectData* MapData::FindRootMap() const { return root_map_; }
void JSObjectData::SerializeRecursiveAsBoilerplate(JSHeapBroker* broker,
int depth) {
if (serialized_as_boilerplate_) return;
serialized_as_boilerplate_ = true;
TraceScope tracer(broker, this,
"JSObjectData::SerializeRecursiveAsBoilerplate");
Handle<JSObject> boilerplate = Handle<JSObject>::cast(object());
// We only serialize boilerplates that pass the IsInlinableFastLiteral
// check, so we only do a check on the depth here.
CHECK_GT(depth, 0);
CHECK(!boilerplate->map().is_deprecated());
// Serialize the elements.
Isolate* const isolate = broker->isolate();
Handle<FixedArrayBase> elements_object(boilerplate->elements(), isolate);
// Boilerplates need special serialization - we need to make sure COW arrays
// are tenured. Boilerplate objects should only be reachable from their
// allocation site, so it is safe to assume that the elements have not been
// serialized yet.
bool const empty_or_cow =
elements_object->length() == 0 ||
elements_object->map() == ReadOnlyRoots(isolate).fixed_cow_array_map();
if (empty_or_cow) {
// We need to make sure copy-on-write elements are tenured.
if (ObjectInYoungGeneration(*elements_object)) {
elements_object = isolate->factory()->CopyAndTenureFixedCOWArray(
Handle<FixedArray>::cast(elements_object));
boilerplate->set_elements(*elements_object);
}
cow_or_empty_elements_tenured_ = true;
}
DCHECK_NULL(elements_);
elements_ = broker->GetOrCreateData(elements_object);
DCHECK(elements_->IsFixedArrayBase());
if (empty_or_cow || elements_->should_access_heap()) {
// No need to do anything here. Empty or copy-on-write elements
// do not need to be serialized because we only need to store the elements
// reference to the allocated object.
} else if (boilerplate->HasSmiOrObjectElements()) {
elements_->AsFixedArray()->SerializeContents(broker);
Handle<FixedArray> fast_elements =
Handle<FixedArray>::cast(elements_object);
int length = elements_object->length();
for (int i = 0; i < length; i++) {
Handle<Object> value(fast_elements->get(i), isolate);
if (value->IsJSObject()) {
ObjectData* value_data = broker->GetOrCreateData(value);
if (!value_data->should_access_heap()) {
value_data->AsJSObject()->SerializeRecursiveAsBoilerplate(broker,
depth - 1);
}
}
}
} else {
CHECK(boilerplate->HasDoubleElements());
CHECK_LE(elements_object->Size(), kMaxRegularHeapObjectSize);
DCHECK_EQ(elements_->kind(), ObjectDataKind::kSerializedHeapObject);
elements_->AsFixedDoubleArray()->SerializeContents(broker);
}
// TODO(turbofan): Do we want to support out-of-object properties?
CHECK(boilerplate->HasFastProperties() &&
boilerplate->property_array().length() == 0);
CHECK_EQ(inobject_fields_.size(), 0u);
// Check the in-object properties.
Handle<DescriptorArray> descriptors(boilerplate->map().instance_descriptors(),
isolate);
for (InternalIndex i : boilerplate->map().IterateOwnDescriptors()) {
PropertyDetails details = descriptors->GetDetails(i);
if (details.location() != kField) continue;
DCHECK_EQ(kData, details.kind());
FieldIndex field_index = FieldIndex::ForDescriptor(boilerplate->map(), i);
// Make sure {field_index} agrees with {inobject_properties} on the index of
// this field.
DCHECK_EQ(field_index.property_index(),
static_cast<int>(inobject_fields_.size()));
if (boilerplate->IsUnboxedDoubleField(field_index)) {
uint64_t value_bits =
boilerplate->RawFastDoublePropertyAsBitsAt(field_index);
inobject_fields_.push_back(JSObjectField{value_bits});
} else {
Handle<Object> value(boilerplate->RawFastPropertyAt(field_index),
isolate);
// In case of double fields we use a sentinel NaN value to mark
// uninitialized fields. A boilerplate value with such a field may migrate
// from its double to a tagged representation. If the double is unboxed,
// the raw double is converted to a heap number, otherwise the (boxed)
// double ceases to be mutable, and becomes a normal heap number. The
// sentinel value carries no special meaning when it occurs in a heap
// number, so we would like to recover the uninitialized value. We check
// for the sentinel here, specifically, since migrations might have been
// triggered as part of boilerplate serialization.
if (!details.representation().IsDouble() && value->IsHeapNumber() &&
HeapNumber::cast(*value).value_as_bits() == kHoleNanInt64) {
value = isolate->factory()->uninitialized_value();
}
ObjectData* value_data = broker->GetOrCreateData(value);
if (value_data->IsJSObject() && !value_data->should_access_heap()) {
value_data->AsJSObject()->SerializeRecursiveAsBoilerplate(broker,
depth - 1);
}
inobject_fields_.push_back(JSObjectField{value_data});
}
}
TRACE(broker, "Copied " << inobject_fields_.size() << " in-object fields");
if (!map()->should_access_heap()) {
map()->AsMap()->SerializeOwnDescriptors(broker);
}
if (IsJSArray()) AsJSArray()->Serialize(broker);
}
void JSRegExpData::SerializeAsRegExpBoilerplate(JSHeapBroker* broker) {
if (serialized_as_reg_exp_boilerplate_) return;
serialized_as_reg_exp_boilerplate_ = true;
TraceScope tracer(broker, this, "JSRegExpData::SerializeAsRegExpBoilerplate");
Handle<JSRegExp> boilerplate = Handle<JSRegExp>::cast(object());
SerializeElements(broker);
raw_properties_or_hash_ =
broker->GetOrCreateData(boilerplate->raw_properties_or_hash());
data_ = broker->GetOrCreateData(boilerplate->data());
source_ = broker->GetOrCreateData(boilerplate->source());
flags_ = broker->GetOrCreateData(boilerplate->flags());
last_index_ = broker->GetOrCreateData(boilerplate->last_index());
}
bool ObjectRef::equals(const ObjectRef& other) const {
#ifdef DEBUG
if (broker()->mode() == JSHeapBroker::kSerialized &&
data_->used_status == ObjectData::Usage::kUnused) {
data_->used_status = ObjectData::Usage::kOnlyIdentityUsed;
}
#endif // DEBUG
return data_ == other.data_;
}
Isolate* ObjectRef::isolate() const { return broker()->isolate(); }
ContextRef ContextRef::previous(size_t* depth,
SerializationPolicy policy) const {
DCHECK_NOT_NULL(depth);
if (data_->should_access_heap()) {
AllowHandleAllocationIfNeeded allow_handle_allocation(data()->kind(),
broker()->mode());
AllowHandleDereferenceIfNeeded allow_handle_dereference(data()->kind(),
broker()->mode());
Context current = *object();
while (*depth != 0 && current.unchecked_previous().IsContext()) {
current = Context::cast(current.unchecked_previous());
(*depth)--;
}
return ContextRef(broker(), broker()->CanonicalPersistentHandle(current));
}
if (*depth == 0) return *this;
ObjectData* previous_data = data()->AsContext()->previous(broker(), policy);
if (previous_data == nullptr || !previous_data->IsContext()) return *this;
*depth = *depth - 1;
return ContextRef(broker(), previous_data).previous(depth, policy);
}
base::Optional<ObjectRef> ContextRef::get(int index,
SerializationPolicy policy) const {
if (data_->should_access_heap()) {
AllowHandleAllocationIfNeeded allow_handle_allocation(data()->kind(),
broker()->mode());
AllowHandleDereferenceIfNeeded allow_handle_dereference(data()->kind(),
broker()->mode());
Handle<Object> value(object()->get(index), broker()->isolate());
return ObjectRef(broker(), value);
}
ObjectData* optional_slot =
data()->AsContext()->GetSlot(broker(), index, policy);
if (optional_slot != nullptr) {
return ObjectRef(broker(), optional_slot);
}
return base::nullopt;
}
SourceTextModuleRef ContextRef::GetModule(SerializationPolicy policy) const {
ContextRef current = *this;
while (current.map().instance_type() != MODULE_CONTEXT_TYPE) {
size_t depth = 1;
current = current.previous(&depth, policy);
CHECK_EQ(depth, 0);
}
return current.get(Context::EXTENSION_INDEX, policy)
.value()
.AsSourceTextModule();
}
JSHeapBroker::JSHeapBroker(Isolate* isolate, Zone* broker_zone,
bool tracing_enabled, bool is_concurrent_inlining,
bool is_native_context_independent)
: isolate_(isolate),
zone_(broker_zone),
refs_(zone()->New<RefsMap>(kMinimalRefsBucketCount, AddressMatcher(),
zone())),
root_index_map_(isolate),
array_and_object_prototypes_(zone()),
tracing_enabled_(tracing_enabled),
is_concurrent_inlining_(is_concurrent_inlining),
is_native_context_independent_(is_native_context_independent),
local_heap_(base::nullopt),
feedback_(zone()),
bytecode_analyses_(zone()),
property_access_infos_(zone()),
minimorphic_property_access_infos_(zone()),
typed_array_string_tags_(zone()),
serialized_functions_(zone()) {
// Note that this initialization of {refs_} with the minimal initial capacity
// is redundant in the normal use case (concurrent compilation enabled,
// standard objects to be serialized), as the map is going to be replaced
// immediately with a larger-capacity one. It doesn't seem to affect the
// performance in a noticeable way though.
TRACE(this, "Constructing heap broker");
}
JSHeapBroker::~JSHeapBroker() { DCHECK(!local_heap_); }
void JSHeapBroker::SetPersistentAndCopyCanonicalHandlesForTesting(
std::unique_ptr<PersistentHandles> persistent_handles,
std::unique_ptr<CanonicalHandlesMap> canonical_handles) {
set_persistent_handles(std::move(persistent_handles));
CopyCanonicalHandlesForTesting(std::move(canonical_handles));
}
void JSHeapBroker::CopyCanonicalHandlesForTesting(
std::unique_ptr<CanonicalHandlesMap> canonical_handles) {
DCHECK_NULL(canonical_handles_);
canonical_handles_ = std::make_unique<CanonicalHandlesMap>(
isolate_->heap(), ZoneAllocationPolicy(zone()));
CanonicalHandlesMap::IteratableScope it_scope(canonical_handles.get());
for (auto it = it_scope.begin(); it != it_scope.end(); ++it) {
Address* entry = *it.entry();
Object key = it.key();
canonical_handles_->Set(key, entry);
}
}
std::string JSHeapBroker::Trace() const {
std::ostringstream oss;
oss << "[" << this << "] ";
for (unsigned i = 0; i < trace_indentation_ * 2; ++i) oss.put(' ');
return oss.str();
}
void JSHeapBroker::InitializeLocalHeap(OptimizedCompilationInfo* info) {
set_persistent_handles(info->DetachPersistentHandles());
set_canonical_handles(info->DetachCanonicalHandles());
DCHECK(!local_heap_);
local_heap_.emplace(isolate_->heap(), std::move(ph_));
}
void JSHeapBroker::TearDownLocalHeap(OptimizedCompilationInfo* info) {
DCHECK_NULL(ph_);
DCHECK(local_heap_);
ph_ = local_heap_->DetachPersistentHandles();
local_heap_.reset();
info->set_canonical_handles(DetachCanonicalHandles());
info->set_persistent_handles(DetachPersistentHandles());
}
void JSHeapBroker::StopSerializing() {
CHECK_EQ(mode_, kSerializing);
TRACE(this, "Stopping serialization");
mode_ = kSerialized;
}
#ifdef DEBUG
void JSHeapBroker::PrintRefsAnalysis() const {
// Usage counts
size_t used_total = 0, unused_total = 0, identity_used_total = 0;
for (RefsMap::Entry* ref = refs_->Start(); ref != nullptr;
ref = refs_->Next(ref)) {