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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/compiler/graph-reducer.h"
#include "src/objects-inl.h"
#include "src/objects/js-array-inl.h"
#include "src/objects/js-regexp-inl.h"
#include "src/objects/module-inl.h"
#include "src/utils.h"
namespace v8 {
namespace internal {
namespace compiler {
#define FORWARD_DECL(Name) class Name##Data;
HEAP_BROKER_OBJECT_LIST(FORWARD_DECL)
#undef FORWARD_DECL
// TODO(neis): It would be nice to share the serialized data for read-only
// objects.
class ObjectData : public ZoneObject {
public:
static ObjectData* Serialize(JSHeapBroker* broker, Handle<Object> object);
ObjectData(JSHeapBroker* broker_, Handle<Object> object_, bool is_smi_)
: broker(broker_), object(object_), is_smi(is_smi_) {
broker->AddData(object, this);
}
#define DECLARE_IS_AND_AS(Name) \
bool Is##Name() const; \
Name##Data* As##Name();
HEAP_BROKER_OBJECT_LIST(DECLARE_IS_AND_AS)
#undef DECLARE_IS_AND_AS
JSHeapBroker* const broker;
Handle<Object> const object;
bool const is_smi;
};
// TODO(neis): Perhaps add a boolean that indicates whether serialization of an
// object has completed. That could be used to add safety checks.
#define GET_OR_CREATE(name) \
broker->GetOrCreateData(handle(object_->name(), broker->isolate()))
class HeapObjectData : public ObjectData {
public:
static HeapObjectData* Serialize(JSHeapBroker* broker,
Handle<HeapObject> object);
HeapObjectType const type;
MapData* const map;
HeapObjectData(JSHeapBroker* broker_, Handle<HeapObject> object_,
HeapObjectType type_)
: ObjectData(broker_, object_, false),
type(type_),
map(GET_OR_CREATE(map)->AsMap()) {
CHECK(broker_->SerializingAllowed());
}
};
class PropertyCellData : public HeapObjectData {
public:
PropertyCellData(JSHeapBroker* broker_, Handle<PropertyCell> object_,
HeapObjectType type_)
: HeapObjectData(broker_, object_, type_) {}
};
class JSObjectData : public HeapObjectData {
public:
JSObjectData(JSHeapBroker* broker_, Handle<JSObject> object_,
HeapObjectType type_)
: HeapObjectData(broker_, object_, type_) {}
};
class JSFunctionData : public JSObjectData {
public:
JSGlobalProxyData* const global_proxy;
MapData* const initial_map; // Can be nullptr.
bool const has_prototype;
ObjectData* const prototype; // Can be nullptr.
bool const PrototypeRequiresRuntimeLookup;
SharedFunctionInfoData* const shared;
JSFunctionData(JSHeapBroker* broker_, Handle<JSFunction> object_,
HeapObjectType type_);
};
class JSRegExpData : public JSObjectData {
public:
JSRegExpData(JSHeapBroker* broker_, Handle<JSRegExp> object_,
HeapObjectType type_)
: JSObjectData(broker_, object_, type_) {}
};
class HeapNumberData : public HeapObjectData {
public:
HeapNumberData(JSHeapBroker* broker_, Handle<HeapNumber> object_,
HeapObjectType type_)
: HeapObjectData(broker_, object_, type_) {}
};
class MutableHeapNumberData : public HeapObjectData {
public:
MutableHeapNumberData(JSHeapBroker* broker_,
Handle<MutableHeapNumber> object_, HeapObjectType type_)
: HeapObjectData(broker_, object_, type_) {}
};
class ContextData : public HeapObjectData {
public:
ContextData(JSHeapBroker* broker_, Handle<Context> object_,
HeapObjectType type_)
: HeapObjectData(broker_, object_, type_) {}
};
class NativeContextData : public ContextData {
public:
#define DECL_MEMBER(type, name) type##Data* const name;
BROKER_NATIVE_CONTEXT_FIELDS(DECL_MEMBER)
#undef DECL_MEMBER
NativeContextData(JSHeapBroker* broker_, Handle<NativeContext> object_,
HeapObjectType type_)
: ContextData(broker_, object_, type_)
#define INIT_MEMBER(type, name) , name(GET_OR_CREATE(name)->As##type())
BROKER_NATIVE_CONTEXT_FIELDS(INIT_MEMBER)
#undef INIT_MEMBER
{
}
};
class NameData : public HeapObjectData {
public:
NameData(JSHeapBroker* broker, Handle<Name> object, HeapObjectType type)
: HeapObjectData(broker, object, type) {}
};
class StringData : public NameData {
public:
StringData(JSHeapBroker* broker, Handle<String> object, HeapObjectType type)
: NameData(broker, object, type),
length(object->length()),
first_char(length > 0 ? object->Get(0) : 0) {
int flags = ALLOW_HEX | ALLOW_OCTAL | ALLOW_BINARY;
if (length <= kMaxLengthForDoubleConversion) {
to_number = StringToDouble(
broker->isolate(), broker->isolate()->unicode_cache(), object, flags);
}
}
int const length;
uint16_t const first_char;
base::Optional<double> to_number;
private:
static constexpr int kMaxLengthForDoubleConversion = 23;
};
class InternalizedStringData : public StringData {
public:
InternalizedStringData(JSHeapBroker* broker,
Handle<InternalizedString> object, HeapObjectType type)
: StringData(broker, object, type) {}
};
namespace {
bool IsFastLiteralHelper(Handle<JSObject> boilerplate, int max_depth,
int* max_properties) {
DCHECK_GE(max_depth, 0);
DCHECK_GE(*max_properties, 0);
// Make sure the boilerplate map is not deprecated.
if (!JSObject::TryMigrateInstance(boilerplate)) return false;
// Check for too deep nesting.
if (max_depth == 0) return false;
// Check the elements.
Isolate* const isolate = boilerplate->GetIsolate();
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);
int limit = boilerplate->map()->NumberOfOwnDescriptors();
for (int i = 0; i < limit; i++) {
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 AllocationSiteData : public HeapObjectData {
public:
AllocationSiteData(JSHeapBroker* broker, Handle<AllocationSite> object_,
HeapObjectType type_)
: HeapObjectData(broker, object_, type_),
PointsToLiteral(object_->PointsToLiteral()),
GetPretenureMode(object_->GetPretenureMode()),
nested_site(GET_OR_CREATE(nested_site)) {
if (PointsToLiteral) {
if (IsInlinableFastLiteral(
handle(object_->boilerplate(), broker->isolate()))) {
boilerplate = GET_OR_CREATE(boilerplate)->AsJSObject();
}
} else {
GetElementsKind = object_->GetElementsKind();
CanInlineCall = object_->CanInlineCall();
}
}
bool const PointsToLiteral;
PretenureFlag const GetPretenureMode;
ObjectData* const nested_site;
JSObjectData* boilerplate = nullptr;
// These are only valid if PointsToLiteral is false.
ElementsKind GetElementsKind = NO_ELEMENTS;
bool CanInlineCall = false;
};
// Only used in JSNativeContextSpecialization.
class ScriptContextTableData : public HeapObjectData {
public:
ScriptContextTableData(JSHeapBroker* broker_,
Handle<ScriptContextTable> object_,
HeapObjectType type_)
: HeapObjectData(broker_, object_, type_) {}
};
class MapData : public HeapObjectData {
public:
InstanceType const instance_type;
int const instance_size;
byte const bit_field;
byte const bit_field2;
uint32_t const bit_field3;
MapData(JSHeapBroker* broker_, Handle<Map> object_, HeapObjectType type_);
// Extra information.
void SerializeElementsKindGeneralizations();
const ZoneVector<MapData*>& elements_kind_generalizations() {
return elements_kind_generalizations_;
}
private:
ZoneVector<MapData*> elements_kind_generalizations_;
};
MapData::MapData(JSHeapBroker* broker_, Handle<Map> object_,
HeapObjectType type_)
: HeapObjectData(broker_, object_, type_),
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()),
elements_kind_generalizations_(broker->zone()) {}
JSFunctionData::JSFunctionData(JSHeapBroker* broker_,
Handle<JSFunction> object_, HeapObjectType type_)
: JSObjectData(broker_, object_, type_),
global_proxy(GET_OR_CREATE(global_proxy)->AsJSGlobalProxy()),
initial_map(object_->has_prototype_slot() && object_->has_initial_map()
? GET_OR_CREATE(initial_map)->AsMap()
: nullptr),
has_prototype(object_->has_prototype_slot() && object_->has_prototype()),
prototype(has_prototype ? GET_OR_CREATE(prototype) : nullptr),
PrototypeRequiresRuntimeLookup(object_->PrototypeRequiresRuntimeLookup()),
shared(GET_OR_CREATE(shared)->AsSharedFunctionInfo()) {
if (initial_map != nullptr && initial_map->instance_type == JS_ARRAY_TYPE) {
initial_map->SerializeElementsKindGeneralizations();
}
}
void MapData::SerializeElementsKindGeneralizations() {
broker->Trace("Computing ElementsKind generalizations of %p.\n", *object);
DCHECK_EQ(instance_type, JS_ARRAY_TYPE);
MapRef self(this);
ElementsKind from_kind = self.elements_kind();
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<Map>(), to_kind);
elements_kind_generalizations_.push_back(
broker->GetOrCreateData(target)->AsMap());
}
}
}
class FeedbackVectorData : public HeapObjectData {
public:
const ZoneVector<ObjectData*>& feedback() { return feedback_; }
FeedbackVectorData(JSHeapBroker* broker_, Handle<FeedbackVector> object_,
HeapObjectType type_);
private:
ZoneVector<ObjectData*> feedback_;
};
FeedbackVectorData::FeedbackVectorData(JSHeapBroker* broker_,
Handle<FeedbackVector> object_,
HeapObjectType type_)
: HeapObjectData(broker_, object_, type_), feedback_(broker_->zone()) {
feedback_.reserve(object_->length());
for (int i = 0; i < object_->length(); ++i) {
MaybeObject* value = object_->get(i);
feedback_.push_back(value->IsObject()
? broker->GetOrCreateData(
handle(value->ToObject(), broker->isolate()))
: nullptr);
}
DCHECK_EQ(object_->length(), feedback_.size());
}
class FixedArrayBaseData : public HeapObjectData {
public:
int const length;
FixedArrayBaseData(JSHeapBroker* broker_, Handle<FixedArrayBase> object_,
HeapObjectType type_)
: HeapObjectData(broker_, object_, type_), length(object_->length()) {}
};
class FixedArrayData : public FixedArrayBaseData {
public:
FixedArrayData(JSHeapBroker* broker_, Handle<FixedArray> object_,
HeapObjectType type_)
: FixedArrayBaseData(broker_, object_, type_) {}
};
class FixedDoubleArrayData : public FixedArrayBaseData {
public:
FixedDoubleArrayData(JSHeapBroker* broker_, Handle<FixedDoubleArray> object_,
HeapObjectType type_)
: FixedArrayBaseData(broker_, object_, type_) {}
};
class BytecodeArrayData : public FixedArrayBaseData {
public:
int const register_count;
BytecodeArrayData(JSHeapBroker* broker_, Handle<BytecodeArray> object_,
HeapObjectType type_)
: FixedArrayBaseData(broker_, object_, type_),
register_count(object_->register_count()) {}
};
class JSArrayData : public JSObjectData {
public:
JSArrayData(JSHeapBroker* broker_, Handle<JSArray> object_,
HeapObjectType type_)
: JSObjectData(broker_, object_, type_) {}
};
class ScopeInfoData : public HeapObjectData {
public:
ScopeInfoData(JSHeapBroker* broker_, Handle<ScopeInfo> object_,
HeapObjectType type_)
: HeapObjectData(broker_, object_, type_) {}
};
class SharedFunctionInfoData : public HeapObjectData {
public:
int const builtin_id;
BytecodeArrayData* const GetBytecodeArray; // Can be nullptr.
#define DECL_MEMBER(type, name) type const name;
BROKER_SFI_FIELDS(DECL_MEMBER)
#undef DECL_MEMBER
SharedFunctionInfoData(JSHeapBroker* broker_,
Handle<SharedFunctionInfo> object_,
HeapObjectType type_)
: HeapObjectData(broker_, object_, type_),
builtin_id(object_->HasBuiltinId() ? object_->builtin_id()
: Builtins::kNoBuiltinId),
GetBytecodeArray(
object_->HasBytecodeArray()
? GET_OR_CREATE(GetBytecodeArray)->AsBytecodeArray()
: nullptr)
#define INIT_MEMBER(type, name) , name(object_->name())
BROKER_SFI_FIELDS(INIT_MEMBER)
#undef INIT_MEMBER
{
DCHECK_EQ(HasBuiltinId, builtin_id != Builtins::kNoBuiltinId);
DCHECK_EQ(HasBytecodeArray, GetBytecodeArray != nullptr);
}
};
class ModuleData : public HeapObjectData {
public:
ModuleData(JSHeapBroker* broker_, Handle<Module> object_,
HeapObjectType type_)
: HeapObjectData(broker_, object_, type_) {}
};
class CellData : public HeapObjectData {
public:
CellData(JSHeapBroker* broker_, Handle<Cell> object_, HeapObjectType type_)
: HeapObjectData(broker_, object_, type_) {}
};
class JSGlobalProxyData : public JSObjectData {
public:
JSGlobalProxyData(JSHeapBroker* broker_, Handle<JSGlobalProxy> object_,
HeapObjectType type_)
: JSObjectData(broker_, object_, type_) {}
};
class CodeData : public HeapObjectData {
public:
CodeData(JSHeapBroker* broker_, Handle<Code> object_, HeapObjectType type_)
: HeapObjectData(broker_, object_, type_) {}
};
#define DEFINE_IS_AND_AS(Name) \
bool ObjectData::Is##Name() const { \
if (broker->mode() == JSHeapBroker::kDisabled) { \
AllowHandleDereference allow_handle_dereference; \
return object->Is##Name(); \
} \
if (is_smi) return false; \
InstanceType instance_type = \
static_cast<const HeapObjectData*>(this)->type.instance_type(); \
return InstanceTypeChecker::Is##Name(instance_type); \
} \
Name##Data* ObjectData::As##Name() { \
CHECK_NE(broker->mode(), JSHeapBroker::kDisabled); \
CHECK(Is##Name()); \
return static_cast<Name##Data*>(this); \
}
HEAP_BROKER_OBJECT_LIST(DEFINE_IS_AND_AS)
#undef DEFINE_IS_AND_AS
ObjectData* ObjectData::Serialize(JSHeapBroker* broker, Handle<Object> object) {
CHECK(broker->SerializingAllowed());
return object->IsSmi() ? new (broker->zone()) ObjectData(broker, object, true)
: HeapObjectData::Serialize(
broker, Handle<HeapObject>::cast(object));
}
HeapObjectData* HeapObjectData::Serialize(JSHeapBroker* broker,
Handle<HeapObject> object) {
CHECK(broker->SerializingAllowed());
Handle<Map> map(object->map(), broker->isolate());
HeapObjectType type = broker->HeapObjectTypeFromMap(map);
#define RETURN_CREATE_DATA_IF_MATCH(name) \
if (object->Is##name()) { \
return new (broker->zone()) \
name##Data(broker, Handle<name>::cast(object), type); \
}
HEAP_BROKER_OBJECT_LIST(RETURN_CREATE_DATA_IF_MATCH)
#undef RETURN_CREATE_DATA_IF_MATCH
UNREACHABLE();
}
bool ObjectRef::equals(const ObjectRef& other) const {
return data_ == other.data_;
}
StringRef ObjectRef::TypeOf() const {
AllowHandleAllocation handle_allocation;
AllowHandleDereference handle_dereference;
return StringRef(broker(),
Object::TypeOf(broker()->isolate(), object<Object>()));
}
Isolate* ObjectRef::isolate() const { return broker()->isolate(); }
base::Optional<ContextRef> ContextRef::previous() const {
AllowHandleAllocation handle_allocation;
AllowHandleDereference handle_dereference;
Context* previous = object<Context>()->previous();
if (previous == nullptr) return base::Optional<ContextRef>();
return ContextRef(broker(), handle(previous, broker()->isolate()));
}
ObjectRef ContextRef::get(int index) const {
AllowHandleAllocation handle_allocation;
AllowHandleDereference handle_dereference;
Handle<Object> value(object<Context>()->get(index), broker()->isolate());
return ObjectRef(broker(), value);
}
JSHeapBroker::JSHeapBroker(Isolate* isolate, Zone* zone)
: isolate_(isolate),
zone_(zone),
refs_(zone),
mode_(FLAG_concurrent_compiler_frontend ? kSerializing : kDisabled) {
Trace("%s", "Constructing heap broker.\n");
}
void JSHeapBroker::Trace(const char* format, ...) const {
if (FLAG_trace_heap_broker) {
PrintF("[%p] ", this);
va_list arguments;
va_start(arguments, format);
base::OS::VPrint(format, arguments);
va_end(arguments);
}
}
bool JSHeapBroker::SerializingAllowed() const {
return mode() == kSerializing ||
(!FLAG_strict_heap_broker && mode() == kSerialized);
}
void JSHeapBroker::SerializeStandardObjects() {
Trace("Serializing standard objects.\n");
Builtins* const b = isolate()->builtins();
Factory* const f = isolate()->factory();
// Stuff used by JSGraph:
GetOrCreateData(f->empty_fixed_array());
// Stuff used by JSCreateLowering:
GetOrCreateData(f->block_context_map());
GetOrCreateData(f->catch_context_map());
GetOrCreateData(f->eval_context_map());
GetOrCreateData(f->fixed_array_map());
GetOrCreateData(f->fixed_double_array_map());
GetOrCreateData(f->function_context_map());
GetOrCreateData(f->many_closures_cell_map());
GetOrCreateData(f->mutable_heap_number_map());
GetOrCreateData(f->name_dictionary_map());
GetOrCreateData(f->one_pointer_filler_map());
GetOrCreateData(f->sloppy_arguments_elements_map());
GetOrCreateData(f->with_context_map());
// Stuff used by TypedOptimization:
// Strings produced by typeof:
GetOrCreateData(f->boolean_string());
GetOrCreateData(f->number_string());
GetOrCreateData(f->string_string());
GetOrCreateData(f->bigint_string());
GetOrCreateData(f->symbol_string());
GetOrCreateData(f->undefined_string());
GetOrCreateData(f->object_string());
GetOrCreateData(f->function_string());
// Stuff used by JSTypedLowering:
GetOrCreateData(f->length_string());
Builtins::Name builtins[] = {
Builtins::kArgumentsAdaptorTrampoline,
Builtins::kCallFunctionForwardVarargs,
Builtins::kStringAdd_CheckNone_NotTenured,
Builtins::kStringAdd_CheckNone_Tenured,
Builtins::kStringAdd_ConvertLeft_NotTenured,
Builtins::kStringAdd_ConvertRight_NotTenured,
};
for (auto id : builtins) {
GetOrCreateData(b->builtin_handle(id));
}
for (int32_t id = 0; id < Builtins::builtin_count; ++id) {
if (Builtins::KindOf(id) == Builtins::TFJ) {
GetOrCreateData(b->builtin_handle(id));
}
}
Trace("Finished serializing standard objects.\n");
}
HeapObjectType JSHeapBroker::HeapObjectTypeFromMap(Map* map) const {
AllowHandleDereference allow_handle_dereference;
OddballType oddball_type = OddballType::kNone;
if (map->instance_type() == ODDBALL_TYPE) {
ReadOnlyRoots roots(isolate_);
if (map == roots.undefined_map()) {
oddball_type = OddballType::kUndefined;
} else if (map == roots.null_map()) {
oddball_type = OddballType::kNull;
} else if (map == roots.boolean_map()) {
oddball_type = OddballType::kBoolean;
} else if (map == roots.the_hole_map()) {
oddball_type = OddballType::kHole;
} else if (map == roots.uninitialized_map()) {
oddball_type = OddballType::kUninitialized;
} else {
oddball_type = OddballType::kOther;
DCHECK(map == roots.termination_exception_map() ||
map == roots.arguments_marker_map() ||
map == roots.optimized_out_map() ||
map == roots.stale_register_map());
}
}
HeapObjectType::Flags flags(0);
if (map->is_undetectable()) flags |= HeapObjectType::kUndetectable;
if (map->is_callable()) flags |= HeapObjectType::kCallable;
return HeapObjectType(map->instance_type(), flags, oddball_type);
}
ObjectData* JSHeapBroker::GetData(Handle<Object> object) const {
auto it = refs_.find(object.address());
return it != refs_.end() ? it->second : nullptr;
}
ObjectData* JSHeapBroker::GetOrCreateData(Handle<Object> object) {
CHECK(SerializingAllowed());
ObjectData* data = GetData(object);
if (data == nullptr) {
// TODO(neis): Remove these Allow* once we serialize everything upfront.
AllowHandleAllocation handle_allocation;
AllowHandleDereference handle_dereference;
data = ObjectData::Serialize(this, object);
}
CHECK_NOT_NULL(data);
return data;
}
void JSHeapBroker::AddData(Handle<Object> object, ObjectData* data) {
Trace("Creating data %p for handle %" V8PRIuPTR " (", data, object.address());
if (FLAG_trace_heap_broker) {
object->ShortPrint();
PrintF(")\n");
}
CHECK_NOT_NULL(isolate()->handle_scope_data()->canonical_scope);
CHECK(refs_.insert({object.address(), data}).second);
}
#define DEFINE_IS_AND_AS(Name) \
bool ObjectRef::Is##Name() const { return data()->Is##Name(); } \
Name##Ref ObjectRef::As##Name() const { \
DCHECK(Is##Name()); \
return Name##Ref(data()); \
}
HEAP_BROKER_OBJECT_LIST(DEFINE_IS_AND_AS)
#undef DEFINE_IS_AND_AS
bool ObjectRef::IsSmi() const { return data()->is_smi; }
int ObjectRef::AsSmi() const {
DCHECK(IsSmi());
// Handle-dereference is always allowed for Handle<Smi>.
return object<Smi>()->value();
}
HeapObjectType HeapObjectRef::type() const {
if (broker()->mode() == JSHeapBroker::kDisabled) {
AllowHandleDereference allow_handle_dereference;
return broker()->HeapObjectTypeFromMap(object<HeapObject>()->map());
} else {
return data()->AsHeapObject()->type;
}
}
base::Optional<MapRef> HeapObjectRef::TryGetObjectCreateMap() const {
AllowHandleAllocation handle_allocation;
AllowHandleDereference allow_handle_dereference;
Handle<Map> instance_map;
if (Map::TryGetObjectCreateMap(broker()->isolate(), object<HeapObject>())
.ToHandle(&instance_map)) {
return MapRef(broker(), instance_map);
} else {
return base::Optional<MapRef>();
}
}
base::Optional<MapRef> MapRef::AsElementsKind(ElementsKind kind) const {
if (broker()->mode() == JSHeapBroker::kDisabled) {
AllowHandleAllocation handle_allocation;
AllowHeapAllocation heap_allocation;
AllowHandleDereference allow_handle_dereference;
return MapRef(broker(), Map::AsElementsKind(broker()->isolate(),
object<Map>(), kind));
} else {
if (kind == elements_kind()) return *this;
const ZoneVector<MapData*>& elements_kind_generalizations =
data()->AsMap()->elements_kind_generalizations();
for (auto data : elements_kind_generalizations) {
MapRef map(data);
if (map.elements_kind() == kind) return map;
}
return base::Optional<MapRef>();
}
}
int JSFunctionRef::InitialMapInstanceSizeWithMinSlack() const {
AllowHandleDereference allow_handle_dereference;
AllowHandleAllocation handle_allocation;
return object<JSFunction>()->ComputeInstanceSizeWithMinSlack(
broker()->isolate());
}
base::Optional<ScriptContextTableRef::LookupResult>
ScriptContextTableRef::lookup(const NameRef& name) const {
AllowHandleAllocation handle_allocation;
AllowHandleDereference handle_dereference;
if (!name.IsString()) return {};
ScriptContextTable::LookupResult lookup_result;
auto table = object<ScriptContextTable>();
if (!ScriptContextTable::Lookup(broker()->isolate(), table,
name.object<String>(), &lookup_result)) {
return {};
}
Handle<Context> script_context = ScriptContextTable::GetContext(
broker()->isolate(), table, lookup_result.context_index);
LookupResult result{ContextRef(broker(), script_context),
lookup_result.mode == VariableMode::kConst,
lookup_result.slot_index};
return result;
}
OddballType ObjectRef::oddball_type() const {
return IsSmi() ? OddballType::kNone : AsHeapObject().type().oddball_type();
}
ObjectRef FeedbackVectorRef::get(FeedbackSlot slot) const {
if (broker()->mode() == JSHeapBroker::kDisabled) {
AllowHandleAllocation handle_allocation;
AllowHandleDereference handle_dereference;
Handle<Object> value(object<FeedbackVector>()->Get(slot)->ToObject(),
broker()->isolate());
return ObjectRef(broker(), value);
}
int i = FeedbackVector::GetIndex(slot);
return ObjectRef(data()->AsFeedbackVector()->feedback().at(i));
}
bool JSObjectRef::IsUnboxedDoubleField(FieldIndex index) const {
AllowHandleDereference handle_dereference;
return object<JSObject>()->IsUnboxedDoubleField(index);
}
double JSObjectRef::RawFastDoublePropertyAt(FieldIndex index) const {
AllowHandleDereference handle_dereference;
return object<JSObject>()->RawFastDoublePropertyAt(index);
}
ObjectRef JSObjectRef::RawFastPropertyAt(FieldIndex index) const {
AllowHandleAllocation handle_allocation;
AllowHandleDereference handle_dereference;
return ObjectRef(broker(),
handle(object<JSObject>()->RawFastPropertyAt(index),
broker()->isolate()));
}
bool AllocationSiteRef::IsFastLiteral() const {
if (broker()->mode() == JSHeapBroker::kDisabled) {
AllowHeapAllocation
allow_heap_allocation; // This is needed for TryMigrateInstance.
AllowHandleAllocation allow_handle_allocation;
AllowHandleDereference allow_handle_dereference;
return IsInlinableFastLiteral(
handle(object<AllocationSite>()->boilerplate(), broker()->isolate()));
} else {
return data()->AsAllocationSite()->boilerplate != nullptr;
}
}
void JSObjectRef::EnsureElementsTenured() {
// TODO(jarin) Eventually, we will pretenure the boilerplates before
// the compilation job starts.
AllowHandleAllocation allow_handle_allocation;
AllowHandleDereference allow_handle_dereference;
AllowHeapAllocation allow_heap_allocation;
Handle<FixedArrayBase> object_elements = elements().object<FixedArrayBase>();
if (Heap::InNewSpace(*object_elements)) {
// If we would like to pretenure a fixed cow array, we must ensure that
// the array is already in old space, otherwise we'll create too many
// old-to-new-space pointers (overflowing the store buffer).
object_elements =
broker()->isolate()->factory()->CopyAndTenureFixedCOWArray(
Handle<FixedArray>::cast(object_elements));
object<JSObject>()->set_elements(*object_elements);
}
}
FieldIndex MapRef::GetFieldIndexFor(int i) const {
AllowHandleDereference allow_handle_dereference;
return FieldIndex::ForDescriptor(*object<Map>(), i);
}
int MapRef::GetInObjectPropertyOffset(int i) const {
AllowHandleDereference allow_handle_dereference;
return object<Map>()->GetInObjectPropertyOffset(i);
}
PropertyDetails MapRef::GetPropertyDetails(int i) const {
AllowHandleDereference allow_handle_dereference;
return object<Map>()->instance_descriptors()->GetDetails(i);
}
NameRef MapRef::GetPropertyKey(int i) const {
AllowHandleAllocation handle_allocation;
AllowHandleDereference allow_handle_dereference;
return NameRef(broker(),
handle(object<Map>()->instance_descriptors()->GetKey(i),
broker()->isolate()));
}
bool MapRef::IsFixedCowArrayMap() const {
AllowHandleDereference allow_handle_dereference;
return *object<Map>() ==
ReadOnlyRoots(broker()->isolate()).fixed_cow_array_map();
}
MapRef MapRef::FindFieldOwner(int descriptor) const {
AllowHandleAllocation handle_allocation;
AllowHandleDereference allow_handle_dereference;
Handle<Map> owner(
object<Map>()->FindFieldOwner(broker()->isolate(), descriptor),
broker()->isolate());
return MapRef(broker(), owner);
}
ObjectRef MapRef::GetFieldType(int descriptor) const {
AllowHandleAllocation handle_allocation;
AllowHandleDereference allow_handle_dereference;
Handle<FieldType> field_type(
object<Map>()->instance_descriptors()->GetFieldType(descriptor),
broker()->isolate());
return ObjectRef(broker(), field_type);
}
uint16_t StringRef::GetFirstChar() {
if (broker()->mode() == JSHeapBroker::kDisabled) {
AllowHandleDereference allow_handle_dereference;
return object<String>()->Get(0);
} else {
return data()->AsString()->first_char;
}
}
base::Optional<double> StringRef::ToNumber() {
if (broker()->mode() == JSHeapBroker::kDisabled) {
AllowHandleDereference allow_handle_dereference;
AllowHandleAllocation allow_handle_allocation;
AllowHeapAllocation allow_heap_allocation;
int flags = ALLOW_HEX | ALLOW_OCTAL | ALLOW_BINARY;
return StringToDouble(broker()->isolate(),
broker()->isolate()->unicode_cache(),
object<String>(), flags);
} else {
return data()->AsString()->to_number;
}
}
bool FixedArrayRef::is_the_hole(int i) const {
AllowHandleDereference allow_handle_dereference;
return object<FixedArray>()->is_the_hole(broker()->isolate(), i);
}
ObjectRef FixedArrayRef::get(int i) const {
AllowHandleAllocation handle_allocation;
AllowHandleDereference allow_handle_dereference;
return ObjectRef(broker(),
handle(object<FixedArray>()->get(i), broker()->isolate()));
}
bool FixedDoubleArrayRef::is_the_hole(int i) const {
AllowHandleDereference allow_handle_dereference;
return object<FixedDoubleArray>()->is_the_hole(i);
}
double FixedDoubleArrayRef::get_scalar(int i) const {
AllowHandleDereference allow_handle_dereference;
return object<FixedDoubleArray>()->get_scalar(i);
}
#define IF_BROKER_DISABLED_ACCESS_HANDLE_C(holder, name) \
if (broker()->mode() == JSHeapBroker::kDisabled) { \
AllowHandleAllocation handle_allocation; \
AllowHandleDereference allow_handle_dereference; \
return object<holder>()->name(); \
}
// Macros for definining a const getter that, depending on the broker mode,
// either looks into the handle or into the serialized data. The first one is
// used for the rare case of a XYZRef class that does not have a corresponding
// XYZ class in objects.h. The second one is used otherwise.
#define BIMODAL_ACCESSOR(holder, result, name) \
result##Ref holder##Ref::name() const { \
if (broker()->mode() == JSHeapBroker::kDisabled) { \
AllowHandleAllocation handle_allocation; \
AllowHandleDereference allow_handle_dereference; \
return result##Ref( \
broker(), handle(object<holder>()->name(), broker()->isolate())); \
} else { \
return result##Ref(data()->As##holder()->name); \
} \
}
// Like HANDLE_ACCESSOR except that the result type is not an XYZRef.
#define BIMODAL_ACCESSOR_C(holder, result, name) \
result holder##Ref::name() const { \
IF_BROKER_DISABLED_ACCESS_HANDLE_C(holder, name); \
return data()->As##holder()->name; \
}
// Like HANDLE_ACCESSOR_C but for BitFields.
#define BIMODAL_ACCESSOR_B(holder, field, name, BitField) \
typename BitField::FieldType holder##Ref::name() const { \
IF_BROKER_DISABLED_ACCESS_HANDLE_C(holder, name); \
return BitField::decode(data()->As##holder()->field); \
}
// Macros for definining a const getter that always looks into the handle.
// (These will go away once we serialize everything.) The first one is used for
// the rare case of a XYZRef class that does not have a corresponding XYZ class
// in objects.h. The second one is used otherwise.
#define HANDLE_ACCESSOR(holder, result, name) \
result##Ref holder##Ref::name() const { \
AllowHandleAllocation handle_allocation; \
AllowHandleDereference allow_handle_dereference; \
return result##Ref(broker(), \
handle(object<holder>()->name(), broker()->isolate())); \
}
// Like HANDLE_ACCESSOR except that the result type is not an XYZRef.
#define HANDLE_ACCESSOR_C(holder, result, name) \
result holder##Ref::name() const { \
AllowHandleAllocation handle_allocation; \
AllowHandleDereference allow_handle_dereference; \
return object<holder>()->name(); \
}
BIMODAL_ACCESSOR(AllocationSite, Object, nested_site)
BIMODAL_ACCESSOR_C(AllocationSite, bool, CanInlineCall)
BIMODAL_ACCESSOR_C(AllocationSite, bool, PointsToLiteral)
BIMODAL_ACCESSOR_C(AllocationSite, ElementsKind, GetElementsKind)
BIMODAL_ACCESSOR_C(AllocationSite, PretenureFlag, GetPretenureMode)
BIMODAL_ACCESSOR_C(BytecodeArray, int, register_count)
BIMODAL_ACCESSOR_C(FixedArrayBase, int, length)
BIMODAL_ACCESSOR(HeapObject, Map, map)
HANDLE_ACCESSOR_C(HeapObject, bool, IsExternalString)
HANDLE_ACCESSOR_C(HeapObject, bool, IsSeqString)
HANDLE_ACCESSOR_C(HeapNumber, double, value)
HANDLE_ACCESSOR(JSArray, Object, length)
BIMODAL_ACCESSOR_C(JSFunction, bool, has_prototype)
BIMODAL_ACCESSOR_C(JSFunction, bool, PrototypeRequiresRuntimeLookup)
BIMODAL_ACCESSOR(JSFunction, Map, initial_map)
BIMODAL_ACCESSOR(JSFunction, Object, prototype)
HANDLE_ACCESSOR_C(JSFunction, bool, IsConstructor)
HANDLE_ACCESSOR(JSFunction, JSGlobalProxy, global_proxy)
HANDLE_ACCESSOR(JSFunction, SharedFunctionInfo, shared)
HANDLE_ACCESSOR(JSObject, FixedArrayBase, elements)
HANDLE_ACCESSOR(JSRegExp, Object, data)
HANDLE_ACCESSOR(JSRegExp, Object, flags)
HANDLE_ACCESSOR(JSRegExp, Object, last_index)
HANDLE_ACCESSOR(JSRegExp, Object, raw_properties_or_hash)
HANDLE_ACCESSOR(JSRegExp, Object, source)
BIMODAL_ACCESSOR_B(Map, bit_field2, elements_kind, Map::ElementsKindBits)
BIMODAL_ACCESSOR_B(Map, bit_field3, is_deprecated, Map::IsDeprecatedBit)
BIMODAL_ACCESSOR_B(Map, bit_field3, is_dictionary_map, Map::IsDictionaryMapBit)
BIMODAL_ACCESSOR_B(Map, bit_field, has_prototype_slot, Map::HasPrototypeSlotBit)
BIMODAL_ACCESSOR_C(Map, int, instance_size)
HANDLE_ACCESSOR_C(Map, bool, CanBeDeprecated)
HANDLE_ACCESSOR_C(Map, bool, CanTransition)
HANDLE_ACCESSOR_C(Map, bool, IsInobjectSlackTrackingInProgress)
HANDLE_ACCESSOR_C(Map, bool, IsJSArrayMap)
HANDLE_ACCESSOR_C(Map, bool, is_stable)
HANDLE_ACCESSOR_C(Map, InstanceType, instance_type)
HANDLE_ACCESSOR_C(Map, int, GetInObjectProperties)
HANDLE_ACCESSOR_C(Map, int, GetInObjectPropertiesStartInWords)
HANDLE_ACCESSOR_C(Map, int, NumberOfOwnDescriptors)
HANDLE_ACCESSOR(Map, Object, constructor_or_backpointer)
HANDLE_ACCESSOR_C(MutableHeapNumber, double, value)
#define DEF_NATIVE_CONTEXT_ACCESSOR(type, name) \
BIMODAL_ACCESSOR(NativeContext, type, name)
BROKER_NATIVE_CONTEXT_FIELDS(DEF_NATIVE_CONTEXT_ACCESSOR)
#undef DEF_NATIVE_CONTEXT_ACCESSOR
HANDLE_ACCESSOR(PropertyCell, Object, value)
HANDLE_ACCESSOR_C(PropertyCell, PropertyDetails, property_details)
HANDLE_ACCESSOR_C(ScopeInfo, int, ContextLength)
BIMODAL_ACCESSOR_C(SharedFunctionInfo, int, builtin_id)
BIMODAL_ACCESSOR(SharedFunctionInfo, BytecodeArray, GetBytecodeArray)
#define DEF_SFI_ACCESSOR(type, name) \
BIMODAL_ACCESSOR_C(SharedFunctionInfo, type, name)
BROKER_SFI_FIELDS(DEF_SFI_ACCESSOR)
#undef DEF_SFI_ACCESSOR
BIMODAL_ACCESSOR_C(String, int, length)
// TODO(neis): Provide StringShape() on StringRef.
bool JSFunctionRef::has_initial_map() const {
IF_BROKER_DISABLED_ACCESS_HANDLE_C(JSFunction, has_initial_map);
return data()->AsJSFunction()->initial_map != nullptr;
}
MapRef NativeContextRef::GetFunctionMapFromIndex(int index) const {
DCHECK_LE(index, Context::LAST_FUNCTION_MAP_INDEX);
DCHECK_GE(index, Context::FIRST_FUNCTION_MAP_INDEX);
return get(index).AsMap();
}
MapRef NativeContextRef::GetInitialJSArrayMap(ElementsKind kind) const {
switch (kind) {
case PACKED_SMI_ELEMENTS:
return js_array_packed_smi_elements_map();
case HOLEY_SMI_ELEMENTS:
return js_array_holey_smi_elements_map();
case PACKED_DOUBLE_ELEMENTS:
return js_array_packed_double_elements_map();
case HOLEY_DOUBLE_ELEMENTS:
return js_array_holey_double_elements_map();
case PACKED_ELEMENTS:
return js_array_packed_elements_map();
case HOLEY_ELEMENTS:
return js_array_holey_elements_map();
default:
UNREACHABLE();
}
}
bool ObjectRef::BooleanValue() {
AllowHandleDereference allow_handle_dereference;
return object<Object>()->BooleanValue(broker()->isolate());
}
double ObjectRef::OddballToNumber() const {
OddballType type = oddball_type();
switch (type) {
case OddballType::kBoolean: {
ObjectRef true_ref(broker(),
broker()->isolate()->factory()->true_value());
return this->equals(true_ref) ? 1 : 0;
break;
}
case OddballType::kUndefined: {
return std::numeric_limits<double>::quiet_NaN();
break;
}
case OddballType::kNull: {
return 0;
break;
}
default: {
UNREACHABLE();
break;
}
}
}
CellRef ModuleRef::GetCell(int cell_index) {
AllowHandleAllocation handle_allocation;
AllowHandleDereference allow_handle_dereference;
return CellRef(broker(), handle(object<Module>()->GetCell(cell_index),
broker()->isolate()));
}
ObjectRef::ObjectRef(JSHeapBroker* broker, Handle<Object> object) {
switch (broker->mode()) {
case JSHeapBroker::kSerialized:
data_ = FLAG_strict_heap_broker ? broker->GetData(object)
: broker->GetOrCreateData(object);
break;
case JSHeapBroker::kSerializing:
data_ = broker->GetOrCreateData(object);
break;
case JSHeapBroker::kDisabled:
data_ = broker->GetData(object);
if (data_ == nullptr) {
AllowHandleDereference handle_dereference;
data_ =
new (broker->zone()) ObjectData(broker, object, object->IsSmi());
}
break;
}
CHECK_NOT_NULL(data_);
}
base::Optional<JSObjectRef> AllocationSiteRef::boilerplate() const {
if (broker()->mode() == JSHeapBroker::kDisabled) {
AllowHandleAllocation handle_allocation;
AllowHandleDereference allow_handle_dereference;
return JSObjectRef(broker(), handle(object<AllocationSite>()->boilerplate(),
broker()->isolate()));
} else {
JSObjectData* boilerplate = data()->AsAllocationSite()->boilerplate;
if (boilerplate) {
return JSObjectRef(boilerplate);
} else {
return base::nullopt;
}
}
}
ElementsKind JSObjectRef::GetElementsKind() const {
return map().elements_kind();
}
Handle<Object> ObjectRef::object() const { return data_->object; }
JSHeapBroker* ObjectRef::broker() const { return data_->broker; }
ObjectData* ObjectRef::data() const { return data_; }
Reduction NoChangeBecauseOfMissingData(JSHeapBroker* broker,
const char* function, int line) {
if (FLAG_trace_heap_broker) {
PrintF("[%p] Skipping optimization in %s at line %d due to missing data\n",
broker, function, line);
}
return AdvancedReducer::NoChange();
}
#undef BIMODAL_ACCESSOR
#undef BIMODAL_ACCESSOR_B
#undef BIMODAL_ACCESSOR_C
#undef GET_OR_CREATE
#undef HANDLE_ACCESSOR
#undef HANDLE_ACCESSOR_C
#undef IF_BROKER_DISABLED_ACCESS_HANDLE_C
} // namespace compiler
} // namespace internal
} // namespace v8
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