| // Copyright 2014 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/feedback-vector.h" |
| #include "src/code-stubs.h" |
| #include "src/feedback-vector-inl.h" |
| #include "src/ic/ic-inl.h" |
| #include "src/ic/ic-state.h" |
| #include "src/objects.h" |
| |
| namespace v8 { |
| namespace internal { |
| |
| static bool IsPropertyNameFeedback(Object* feedback) { |
| if (feedback->IsString()) return true; |
| if (!feedback->IsSymbol()) return false; |
| Symbol* symbol = Symbol::cast(feedback); |
| Heap* heap = symbol->GetHeap(); |
| return symbol != heap->uninitialized_symbol() && |
| symbol != heap->premonomorphic_symbol() && |
| symbol != heap->megamorphic_symbol(); |
| } |
| |
| std::ostream& operator<<(std::ostream& os, FeedbackSlotKind kind) { |
| return os << FeedbackMetadata::Kind2String(kind); |
| } |
| |
| FeedbackSlotKind FeedbackMetadata::GetKind(FeedbackSlot slot) const { |
| int index = VectorICComputer::index(kReservedIndexCount, slot.ToInt()); |
| int data = Smi::cast(get(index))->value(); |
| return VectorICComputer::decode(data, slot.ToInt()); |
| } |
| |
| void FeedbackMetadata::SetKind(FeedbackSlot slot, FeedbackSlotKind kind) { |
| int index = VectorICComputer::index(kReservedIndexCount, slot.ToInt()); |
| int data = Smi::cast(get(index))->value(); |
| int new_data = VectorICComputer::encode(data, slot.ToInt(), kind); |
| set(index, Smi::FromInt(new_data)); |
| } |
| |
| template Handle<FeedbackMetadata> FeedbackMetadata::New( |
| Isolate* isolate, const StaticFeedbackVectorSpec* spec); |
| template Handle<FeedbackMetadata> FeedbackMetadata::New( |
| Isolate* isolate, const FeedbackVectorSpec* spec); |
| |
| // static |
| template <typename Spec> |
| Handle<FeedbackMetadata> FeedbackMetadata::New(Isolate* isolate, |
| const Spec* spec) { |
| Factory* factory = isolate->factory(); |
| |
| const int slot_count = spec->slots(); |
| const int slot_kinds_length = VectorICComputer::word_count(slot_count); |
| const int length = slot_kinds_length + kReservedIndexCount; |
| if (length == kReservedIndexCount) { |
| return Handle<FeedbackMetadata>::cast(factory->empty_fixed_array()); |
| } |
| #ifdef DEBUG |
| for (int i = 0; i < slot_count;) { |
| FeedbackSlotKind kind = spec->GetKind(FeedbackSlot(i)); |
| int entry_size = FeedbackMetadata::GetSlotSize(kind); |
| for (int j = 1; j < entry_size; j++) { |
| FeedbackSlotKind kind = spec->GetKind(FeedbackSlot(i + j)); |
| DCHECK_EQ(FeedbackSlotKind::kInvalid, kind); |
| } |
| i += entry_size; |
| } |
| #endif |
| |
| Handle<FixedArray> array = factory->NewFixedArray(length, TENURED); |
| array->set(kSlotsCountIndex, Smi::FromInt(slot_count)); |
| // Fill the bit-vector part with zeros. |
| for (int i = 0; i < slot_kinds_length; i++) { |
| array->set(kReservedIndexCount + i, Smi::kZero); |
| } |
| |
| Handle<FeedbackMetadata> metadata = Handle<FeedbackMetadata>::cast(array); |
| |
| for (int i = 0; i < slot_count; i++) { |
| FeedbackSlot slot(i); |
| FeedbackSlotKind kind = spec->GetKind(slot); |
| metadata->SetKind(slot, kind); |
| } |
| |
| // It's important that the FeedbackMetadata have a COW map, since it's |
| // pointed to by both a SharedFunctionInfo and indirectly by closures through |
| // the FeedbackVector. The serializer uses the COW map type to decide |
| // this object belongs in the startup snapshot and not the partial |
| // snapshot(s). |
| metadata->set_map(isolate->heap()->fixed_cow_array_map()); |
| |
| return metadata; |
| } |
| |
| bool FeedbackMetadata::SpecDiffersFrom( |
| const FeedbackVectorSpec* other_spec) const { |
| if (other_spec->slots() != slot_count()) { |
| return true; |
| } |
| |
| int slots = slot_count(); |
| for (int i = 0; i < slots;) { |
| FeedbackSlot slot(i); |
| FeedbackSlotKind kind = GetKind(slot); |
| int entry_size = FeedbackMetadata::GetSlotSize(kind); |
| |
| if (kind != other_spec->GetKind(slot)) { |
| return true; |
| } |
| i += entry_size; |
| } |
| return false; |
| } |
| |
| const char* FeedbackMetadata::Kind2String(FeedbackSlotKind kind) { |
| switch (kind) { |
| case FeedbackSlotKind::kInvalid: |
| return "INVALID"; |
| case FeedbackSlotKind::kCall: |
| return "CALL_IC"; |
| case FeedbackSlotKind::kLoadProperty: |
| return "LOAD_IC"; |
| case FeedbackSlotKind::kLoadGlobalInsideTypeof: |
| return "LOAD_GLOBAL_INSIDE_TYPEOF_IC"; |
| case FeedbackSlotKind::kLoadGlobalNotInsideTypeof: |
| return "LOAD_GLOBAL_NOT_INSIDE_TYPEOF_IC"; |
| case FeedbackSlotKind::kLoadKeyed: |
| return "KEYED_LOAD_IC"; |
| case FeedbackSlotKind::kStoreNamedSloppy: |
| return "STORE_SLOPPY_IC"; |
| case FeedbackSlotKind::kStoreNamedStrict: |
| return "STORE_STRICT_IC"; |
| case FeedbackSlotKind::kStoreOwnNamed: |
| return "STORE_OWN_IC"; |
| case FeedbackSlotKind::kStoreKeyedSloppy: |
| return "KEYED_STORE_SLOPPY_IC"; |
| case FeedbackSlotKind::kStoreKeyedStrict: |
| return "KEYED_STORE_STRICT_IC"; |
| case FeedbackSlotKind::kBinaryOp: |
| return "INTERPRETER_BINARYOP_IC"; |
| case FeedbackSlotKind::kCompareOp: |
| return "INTERPRETER_COMPARE_IC"; |
| case FeedbackSlotKind::kToBoolean: |
| return "TO_BOOLEAN_IC"; |
| case FeedbackSlotKind::kStoreDataPropertyInLiteral: |
| return "STORE_DATA_PROPERTY_IN_LITERAL_IC"; |
| case FeedbackSlotKind::kCreateClosure: |
| return "kCreateClosure"; |
| case FeedbackSlotKind::kLiteral: |
| return "LITERAL"; |
| case FeedbackSlotKind::kGeneral: |
| return "STUB"; |
| case FeedbackSlotKind::kKindsNumber: |
| break; |
| } |
| UNREACHABLE(); |
| return "?"; |
| } |
| |
| FeedbackSlotKind FeedbackVector::GetKind(FeedbackSlot slot) const { |
| DCHECK(!is_empty()); |
| return metadata()->GetKind(slot); |
| } |
| |
| // static |
| Handle<FeedbackVector> FeedbackVector::New(Isolate* isolate, |
| Handle<SharedFunctionInfo> shared) { |
| Factory* factory = isolate->factory(); |
| |
| const int slot_count = shared->feedback_metadata()->slot_count(); |
| const int length = slot_count + kReservedIndexCount; |
| |
| Handle<FixedArray> array = factory->NewFixedArray(length, TENURED); |
| array->set_map_no_write_barrier(isolate->heap()->feedback_vector_map()); |
| array->set(kSharedFunctionInfoIndex, *shared); |
| array->set(kInvocationCountIndex, Smi::kZero); |
| |
| // Ensure we can skip the write barrier |
| Handle<Object> uninitialized_sentinel = UninitializedSentinel(isolate); |
| DCHECK_EQ(isolate->heap()->uninitialized_symbol(), *uninitialized_sentinel); |
| Handle<Oddball> undefined_value = factory->undefined_value(); |
| for (int i = 0; i < slot_count;) { |
| FeedbackSlot slot(i); |
| FeedbackSlotKind kind = shared->feedback_metadata()->GetKind(slot); |
| int index = FeedbackVector::GetIndex(slot); |
| int entry_size = FeedbackMetadata::GetSlotSize(kind); |
| |
| Object* extra_value = *uninitialized_sentinel; |
| switch (kind) { |
| case FeedbackSlotKind::kLoadGlobalInsideTypeof: |
| case FeedbackSlotKind::kLoadGlobalNotInsideTypeof: |
| array->set(index, isolate->heap()->empty_weak_cell(), |
| SKIP_WRITE_BARRIER); |
| break; |
| case FeedbackSlotKind::kCompareOp: |
| case FeedbackSlotKind::kBinaryOp: |
| case FeedbackSlotKind::kToBoolean: |
| array->set(index, Smi::kZero, SKIP_WRITE_BARRIER); |
| break; |
| case FeedbackSlotKind::kCreateClosure: { |
| Handle<Cell> cell = factory->NewNoClosuresCell(undefined_value); |
| array->set(index, *cell); |
| break; |
| } |
| case FeedbackSlotKind::kLiteral: |
| array->set(index, *undefined_value, SKIP_WRITE_BARRIER); |
| break; |
| case FeedbackSlotKind::kCall: |
| array->set(index, *uninitialized_sentinel, SKIP_WRITE_BARRIER); |
| extra_value = Smi::kZero; |
| break; |
| case FeedbackSlotKind::kLoadProperty: |
| case FeedbackSlotKind::kLoadKeyed: |
| case FeedbackSlotKind::kStoreNamedSloppy: |
| case FeedbackSlotKind::kStoreNamedStrict: |
| case FeedbackSlotKind::kStoreOwnNamed: |
| case FeedbackSlotKind::kStoreKeyedSloppy: |
| case FeedbackSlotKind::kStoreKeyedStrict: |
| case FeedbackSlotKind::kStoreDataPropertyInLiteral: |
| case FeedbackSlotKind::kGeneral: |
| array->set(index, *uninitialized_sentinel, SKIP_WRITE_BARRIER); |
| break; |
| |
| case FeedbackSlotKind::kInvalid: |
| case FeedbackSlotKind::kKindsNumber: |
| UNREACHABLE(); |
| array->set(index, Smi::kZero, SKIP_WRITE_BARRIER); |
| break; |
| } |
| for (int j = 1; j < entry_size; j++) { |
| array->set(index + j, extra_value, SKIP_WRITE_BARRIER); |
| } |
| i += entry_size; |
| } |
| |
| Handle<FeedbackVector> result = Handle<FeedbackVector>::cast(array); |
| if (isolate->IsCodeCoverageEnabled()) AddToCodeCoverageList(isolate, result); |
| return result; |
| } |
| |
| // static |
| Handle<FeedbackVector> FeedbackVector::Copy(Isolate* isolate, |
| Handle<FeedbackVector> vector) { |
| Handle<FeedbackVector> result; |
| result = Handle<FeedbackVector>::cast( |
| isolate->factory()->CopyFixedArray(Handle<FixedArray>::cast(vector))); |
| if (isolate->IsCodeCoverageEnabled()) AddToCodeCoverageList(isolate, result); |
| return result; |
| } |
| |
| // static |
| void FeedbackVector::AddToCodeCoverageList(Isolate* isolate, |
| Handle<FeedbackVector> vector) { |
| DCHECK(isolate->IsCodeCoverageEnabled()); |
| if (!vector->shared_function_info()->IsSubjectToDebugging()) return; |
| Handle<ArrayList> list = |
| Handle<ArrayList>::cast(isolate->factory()->code_coverage_list()); |
| list = ArrayList::Add(list, vector); |
| isolate->SetCodeCoverageList(*list); |
| } |
| |
| void FeedbackVector::ClearSlots(JSFunction* host_function) { |
| Isolate* isolate = GetIsolate(); |
| |
| Object* uninitialized_sentinel = |
| FeedbackVector::RawUninitializedSentinel(isolate); |
| Oddball* undefined_value = isolate->heap()->undefined_value(); |
| |
| bool feedback_updated = false; |
| FeedbackMetadataIterator iter(metadata()); |
| while (iter.HasNext()) { |
| FeedbackSlot slot = iter.Next(); |
| FeedbackSlotKind kind = iter.kind(); |
| |
| Object* obj = Get(slot); |
| if (obj != uninitialized_sentinel) { |
| switch (kind) { |
| case FeedbackSlotKind::kCall: { |
| CallICNexus nexus(this, slot); |
| if (!nexus.IsCleared()) { |
| nexus.Clear(); |
| feedback_updated = true; |
| } |
| break; |
| } |
| case FeedbackSlotKind::kLoadProperty: { |
| LoadICNexus nexus(this, slot); |
| if (!nexus.IsCleared()) { |
| nexus.Clear(); |
| feedback_updated = true; |
| } |
| break; |
| } |
| case FeedbackSlotKind::kLoadGlobalInsideTypeof: |
| case FeedbackSlotKind::kLoadGlobalNotInsideTypeof: { |
| LoadGlobalICNexus nexus(this, slot); |
| if (!nexus.IsCleared()) { |
| nexus.Clear(); |
| feedback_updated = true; |
| } |
| break; |
| } |
| case FeedbackSlotKind::kLoadKeyed: { |
| KeyedLoadICNexus nexus(this, slot); |
| if (!nexus.IsCleared()) { |
| nexus.Clear(); |
| feedback_updated = true; |
| } |
| break; |
| } |
| case FeedbackSlotKind::kStoreNamedSloppy: |
| case FeedbackSlotKind::kStoreNamedStrict: |
| case FeedbackSlotKind::kStoreOwnNamed: { |
| StoreICNexus nexus(this, slot); |
| if (!nexus.IsCleared()) { |
| nexus.Clear(); |
| feedback_updated = true; |
| } |
| break; |
| } |
| case FeedbackSlotKind::kStoreKeyedSloppy: |
| case FeedbackSlotKind::kStoreKeyedStrict: { |
| KeyedStoreICNexus nexus(this, slot); |
| if (!nexus.IsCleared()) { |
| nexus.Clear(); |
| feedback_updated = true; |
| } |
| break; |
| } |
| case FeedbackSlotKind::kBinaryOp: |
| case FeedbackSlotKind::kCompareOp: { |
| DCHECK(Get(slot)->IsSmi()); |
| // don't clear these smi slots. |
| // Set(slot, Smi::kZero); |
| break; |
| } |
| case FeedbackSlotKind::kCreateClosure: { |
| break; |
| } |
| case FeedbackSlotKind::kGeneral: { |
| if (obj->IsHeapObject()) { |
| InstanceType instance_type = |
| HeapObject::cast(obj)->map()->instance_type(); |
| // AllocationSites are exempt from clearing. They don't store Maps |
| // or Code pointers which can cause memory leaks if not cleared |
| // regularly. |
| if (instance_type != ALLOCATION_SITE_TYPE) { |
| Set(slot, uninitialized_sentinel, SKIP_WRITE_BARRIER); |
| feedback_updated = true; |
| } |
| } |
| break; |
| } |
| case FeedbackSlotKind::kLiteral: { |
| Set(slot, undefined_value, SKIP_WRITE_BARRIER); |
| feedback_updated = true; |
| break; |
| } |
| case FeedbackSlotKind::kStoreDataPropertyInLiteral: { |
| StoreDataPropertyInLiteralICNexus nexus(this, slot); |
| if (!nexus.IsCleared()) { |
| nexus.Clear(); |
| feedback_updated = true; |
| } |
| break; |
| } |
| case FeedbackSlotKind::kToBoolean: |
| case FeedbackSlotKind::kInvalid: |
| case FeedbackSlotKind::kKindsNumber: |
| UNREACHABLE(); |
| break; |
| } |
| } |
| } |
| if (feedback_updated) { |
| IC::OnFeedbackChanged(isolate, host_function); |
| } |
| } |
| |
| Handle<FixedArray> FeedbackNexus::EnsureArrayOfSize(int length) { |
| Isolate* isolate = GetIsolate(); |
| Handle<Object> feedback = handle(GetFeedback(), isolate); |
| if (!feedback->IsFixedArray() || |
| FixedArray::cast(*feedback)->length() != length) { |
| Handle<FixedArray> array = isolate->factory()->NewFixedArray(length); |
| SetFeedback(*array); |
| return array; |
| } |
| return Handle<FixedArray>::cast(feedback); |
| } |
| |
| Handle<FixedArray> FeedbackNexus::EnsureExtraArrayOfSize(int length) { |
| Isolate* isolate = GetIsolate(); |
| Handle<Object> feedback_extra = handle(GetFeedbackExtra(), isolate); |
| if (!feedback_extra->IsFixedArray() || |
| FixedArray::cast(*feedback_extra)->length() != length) { |
| Handle<FixedArray> array = isolate->factory()->NewFixedArray(length); |
| SetFeedbackExtra(*array); |
| return array; |
| } |
| return Handle<FixedArray>::cast(feedback_extra); |
| } |
| |
| void FeedbackNexus::InstallHandlers(Handle<FixedArray> array, |
| MapHandleList* maps, |
| List<Handle<Object>>* handlers) { |
| int receiver_count = maps->length(); |
| for (int current = 0; current < receiver_count; ++current) { |
| Handle<Map> map = maps->at(current); |
| Handle<WeakCell> cell = Map::WeakCellForMap(map); |
| array->set(current * 2, *cell); |
| array->set(current * 2 + 1, *handlers->at(current)); |
| } |
| } |
| |
| void FeedbackNexus::ConfigureUninitialized() { |
| SetFeedback(*FeedbackVector::UninitializedSentinel(GetIsolate()), |
| SKIP_WRITE_BARRIER); |
| SetFeedbackExtra(*FeedbackVector::UninitializedSentinel(GetIsolate()), |
| SKIP_WRITE_BARRIER); |
| } |
| |
| void FeedbackNexus::ConfigurePremonomorphic() { |
| SetFeedback(*FeedbackVector::PremonomorphicSentinel(GetIsolate()), |
| SKIP_WRITE_BARRIER); |
| SetFeedbackExtra(*FeedbackVector::UninitializedSentinel(GetIsolate()), |
| SKIP_WRITE_BARRIER); |
| } |
| |
| void FeedbackNexus::ConfigureMegamorphic() { |
| // Keyed ICs must use ConfigureMegamorphicKeyed. |
| DCHECK(!vector()->IsKeyedLoadIC(slot())); |
| DCHECK(!vector()->IsKeyedStoreIC(slot())); |
| |
| Isolate* isolate = GetIsolate(); |
| SetFeedback(*FeedbackVector::MegamorphicSentinel(isolate), |
| SKIP_WRITE_BARRIER); |
| SetFeedbackExtra(*FeedbackVector::UninitializedSentinel(isolate), |
| SKIP_WRITE_BARRIER); |
| } |
| |
| void KeyedLoadICNexus::ConfigureMegamorphicKeyed(IcCheckType property_type) { |
| Isolate* isolate = GetIsolate(); |
| SetFeedback(*FeedbackVector::MegamorphicSentinel(isolate), |
| SKIP_WRITE_BARRIER); |
| SetFeedbackExtra(Smi::FromInt(static_cast<int>(property_type)), |
| SKIP_WRITE_BARRIER); |
| } |
| |
| void KeyedStoreICNexus::ConfigureMegamorphicKeyed(IcCheckType property_type) { |
| Isolate* isolate = GetIsolate(); |
| SetFeedback(*FeedbackVector::MegamorphicSentinel(isolate), |
| SKIP_WRITE_BARRIER); |
| SetFeedbackExtra(Smi::FromInt(static_cast<int>(property_type)), |
| SKIP_WRITE_BARRIER); |
| } |
| |
| InlineCacheState LoadICNexus::StateFromFeedback() const { |
| Isolate* isolate = GetIsolate(); |
| Object* feedback = GetFeedback(); |
| |
| if (feedback == *FeedbackVector::UninitializedSentinel(isolate)) { |
| return UNINITIALIZED; |
| } else if (feedback == *FeedbackVector::MegamorphicSentinel(isolate)) { |
| return MEGAMORPHIC; |
| } else if (feedback == *FeedbackVector::PremonomorphicSentinel(isolate)) { |
| return PREMONOMORPHIC; |
| } else if (feedback->IsFixedArray()) { |
| // Determine state purely by our structure, don't check if the maps are |
| // cleared. |
| return POLYMORPHIC; |
| } else if (feedback->IsWeakCell()) { |
| // Don't check if the map is cleared. |
| return MONOMORPHIC; |
| } |
| |
| return UNINITIALIZED; |
| } |
| |
| InlineCacheState LoadGlobalICNexus::StateFromFeedback() const { |
| Isolate* isolate = GetIsolate(); |
| Object* feedback = GetFeedback(); |
| |
| Object* extra = GetFeedbackExtra(); |
| if (!WeakCell::cast(feedback)->cleared() || |
| extra != *FeedbackVector::UninitializedSentinel(isolate)) { |
| return MONOMORPHIC; |
| } |
| return UNINITIALIZED; |
| } |
| |
| InlineCacheState KeyedLoadICNexus::StateFromFeedback() const { |
| Isolate* isolate = GetIsolate(); |
| Object* feedback = GetFeedback(); |
| |
| if (feedback == *FeedbackVector::UninitializedSentinel(isolate)) { |
| return UNINITIALIZED; |
| } else if (feedback == *FeedbackVector::PremonomorphicSentinel(isolate)) { |
| return PREMONOMORPHIC; |
| } else if (feedback == *FeedbackVector::MegamorphicSentinel(isolate)) { |
| return MEGAMORPHIC; |
| } else if (feedback->IsFixedArray()) { |
| // Determine state purely by our structure, don't check if the maps are |
| // cleared. |
| return POLYMORPHIC; |
| } else if (feedback->IsWeakCell()) { |
| // Don't check if the map is cleared. |
| return MONOMORPHIC; |
| } else if (feedback->IsName()) { |
| Object* extra = GetFeedbackExtra(); |
| FixedArray* extra_array = FixedArray::cast(extra); |
| return extra_array->length() > 2 ? POLYMORPHIC : MONOMORPHIC; |
| } |
| |
| return UNINITIALIZED; |
| } |
| |
| InlineCacheState StoreICNexus::StateFromFeedback() const { |
| Isolate* isolate = GetIsolate(); |
| Object* feedback = GetFeedback(); |
| |
| if (feedback == *FeedbackVector::UninitializedSentinel(isolate)) { |
| return UNINITIALIZED; |
| } else if (feedback == *FeedbackVector::MegamorphicSentinel(isolate)) { |
| return MEGAMORPHIC; |
| } else if (feedback == *FeedbackVector::PremonomorphicSentinel(isolate)) { |
| return PREMONOMORPHIC; |
| } else if (feedback->IsFixedArray()) { |
| // Determine state purely by our structure, don't check if the maps are |
| // cleared. |
| return POLYMORPHIC; |
| } else if (feedback->IsWeakCell()) { |
| // Don't check if the map is cleared. |
| return MONOMORPHIC; |
| } |
| |
| return UNINITIALIZED; |
| } |
| |
| InlineCacheState KeyedStoreICNexus::StateFromFeedback() const { |
| Isolate* isolate = GetIsolate(); |
| Object* feedback = GetFeedback(); |
| |
| if (feedback == *FeedbackVector::UninitializedSentinel(isolate)) { |
| return UNINITIALIZED; |
| } else if (feedback == *FeedbackVector::PremonomorphicSentinel(isolate)) { |
| return PREMONOMORPHIC; |
| } else if (feedback == *FeedbackVector::MegamorphicSentinel(isolate)) { |
| return MEGAMORPHIC; |
| } else if (feedback->IsFixedArray()) { |
| // Determine state purely by our structure, don't check if the maps are |
| // cleared. |
| return POLYMORPHIC; |
| } else if (feedback->IsWeakCell()) { |
| // Don't check if the map is cleared. |
| return MONOMORPHIC; |
| } else if (feedback->IsName()) { |
| Object* extra = GetFeedbackExtra(); |
| FixedArray* extra_array = FixedArray::cast(extra); |
| return extra_array->length() > 2 ? POLYMORPHIC : MONOMORPHIC; |
| } |
| |
| return UNINITIALIZED; |
| } |
| |
| InlineCacheState CallICNexus::StateFromFeedback() const { |
| Isolate* isolate = GetIsolate(); |
| Object* feedback = GetFeedback(); |
| DCHECK(GetFeedbackExtra() == |
| *FeedbackVector::UninitializedSentinel(isolate) || |
| GetFeedbackExtra()->IsSmi()); |
| |
| if (feedback == *FeedbackVector::MegamorphicSentinel(isolate)) { |
| return GENERIC; |
| } else if (feedback->IsAllocationSite() || feedback->IsWeakCell()) { |
| return MONOMORPHIC; |
| } |
| |
| CHECK(feedback == *FeedbackVector::UninitializedSentinel(isolate)); |
| return UNINITIALIZED; |
| } |
| |
| int CallICNexus::ExtractCallCount() { |
| Object* call_count = GetFeedbackExtra(); |
| CHECK(call_count->IsSmi()); |
| int value = Smi::cast(call_count)->value(); |
| return value; |
| } |
| |
| float CallICNexus::ComputeCallFrequency() { |
| double const invocation_count = vector()->invocation_count(); |
| double const call_count = ExtractCallCount(); |
| return static_cast<float>(call_count / invocation_count); |
| } |
| |
| void CallICNexus::ConfigureUninitialized() { |
| Isolate* isolate = GetIsolate(); |
| SetFeedback(*FeedbackVector::UninitializedSentinel(isolate), |
| SKIP_WRITE_BARRIER); |
| SetFeedbackExtra(Smi::kZero, SKIP_WRITE_BARRIER); |
| } |
| |
| void CallICNexus::ConfigureMonomorphicArray() { |
| Object* feedback = GetFeedback(); |
| if (!feedback->IsAllocationSite()) { |
| Handle<AllocationSite> new_site = |
| GetIsolate()->factory()->NewAllocationSite(); |
| SetFeedback(*new_site); |
| } |
| SetFeedbackExtra(Smi::FromInt(1), SKIP_WRITE_BARRIER); |
| } |
| |
| void CallICNexus::ConfigureMonomorphic(Handle<JSFunction> function) { |
| Handle<WeakCell> new_cell = GetIsolate()->factory()->NewWeakCell(function); |
| SetFeedback(*new_cell); |
| SetFeedbackExtra(Smi::FromInt(1), SKIP_WRITE_BARRIER); |
| } |
| |
| void CallICNexus::ConfigureMegamorphic() { |
| SetFeedback(*FeedbackVector::MegamorphicSentinel(GetIsolate()), |
| SKIP_WRITE_BARRIER); |
| Smi* count = Smi::cast(GetFeedbackExtra()); |
| int new_count = count->value() + 1; |
| SetFeedbackExtra(Smi::FromInt(new_count), SKIP_WRITE_BARRIER); |
| } |
| |
| void CallICNexus::ConfigureMegamorphic(int call_count) { |
| SetFeedback(*FeedbackVector::MegamorphicSentinel(GetIsolate()), |
| SKIP_WRITE_BARRIER); |
| SetFeedbackExtra(Smi::FromInt(call_count), SKIP_WRITE_BARRIER); |
| } |
| |
| void LoadICNexus::ConfigureMonomorphic(Handle<Map> receiver_map, |
| Handle<Object> handler) { |
| Handle<WeakCell> cell = Map::WeakCellForMap(receiver_map); |
| SetFeedback(*cell); |
| SetFeedbackExtra(*handler); |
| } |
| |
| void LoadGlobalICNexus::ConfigureUninitialized() { |
| Isolate* isolate = GetIsolate(); |
| SetFeedback(isolate->heap()->empty_weak_cell(), SKIP_WRITE_BARRIER); |
| SetFeedbackExtra(*FeedbackVector::UninitializedSentinel(isolate), |
| SKIP_WRITE_BARRIER); |
| } |
| |
| void LoadGlobalICNexus::ConfigurePropertyCellMode(Handle<PropertyCell> cell) { |
| Isolate* isolate = GetIsolate(); |
| SetFeedback(*isolate->factory()->NewWeakCell(cell)); |
| SetFeedbackExtra(*FeedbackVector::UninitializedSentinel(isolate), |
| SKIP_WRITE_BARRIER); |
| } |
| |
| void LoadGlobalICNexus::ConfigureHandlerMode(Handle<Object> handler) { |
| SetFeedback(GetIsolate()->heap()->empty_weak_cell()); |
| SetFeedbackExtra(*handler); |
| } |
| |
| void KeyedLoadICNexus::ConfigureMonomorphic(Handle<Name> name, |
| Handle<Map> receiver_map, |
| Handle<Object> handler) { |
| Handle<WeakCell> cell = Map::WeakCellForMap(receiver_map); |
| if (name.is_null()) { |
| SetFeedback(*cell); |
| SetFeedbackExtra(*handler); |
| } else { |
| Handle<FixedArray> array = EnsureExtraArrayOfSize(2); |
| SetFeedback(*name); |
| array->set(0, *cell); |
| array->set(1, *handler); |
| } |
| } |
| |
| void StoreICNexus::ConfigureMonomorphic(Handle<Map> receiver_map, |
| Handle<Object> handler) { |
| Handle<WeakCell> cell = Map::WeakCellForMap(receiver_map); |
| SetFeedback(*cell); |
| SetFeedbackExtra(*handler); |
| } |
| |
| void KeyedStoreICNexus::ConfigureMonomorphic(Handle<Name> name, |
| Handle<Map> receiver_map, |
| Handle<Object> handler) { |
| Handle<WeakCell> cell = Map::WeakCellForMap(receiver_map); |
| if (name.is_null()) { |
| SetFeedback(*cell); |
| SetFeedbackExtra(*handler); |
| } else { |
| Handle<FixedArray> array = EnsureExtraArrayOfSize(2); |
| SetFeedback(*name); |
| array->set(0, *cell); |
| array->set(1, *handler); |
| } |
| } |
| |
| void LoadICNexus::ConfigurePolymorphic(MapHandleList* maps, |
| List<Handle<Object>>* handlers) { |
| Isolate* isolate = GetIsolate(); |
| int receiver_count = maps->length(); |
| Handle<FixedArray> array = EnsureArrayOfSize(receiver_count * 2); |
| InstallHandlers(array, maps, handlers); |
| SetFeedbackExtra(*FeedbackVector::UninitializedSentinel(isolate), |
| SKIP_WRITE_BARRIER); |
| } |
| |
| void KeyedLoadICNexus::ConfigurePolymorphic(Handle<Name> name, |
| MapHandleList* maps, |
| List<Handle<Object>>* handlers) { |
| int receiver_count = maps->length(); |
| DCHECK(receiver_count > 1); |
| Handle<FixedArray> array; |
| if (name.is_null()) { |
| array = EnsureArrayOfSize(receiver_count * 2); |
| SetFeedbackExtra(*FeedbackVector::UninitializedSentinel(GetIsolate()), |
| SKIP_WRITE_BARRIER); |
| } else { |
| array = EnsureExtraArrayOfSize(receiver_count * 2); |
| SetFeedback(*name); |
| } |
| |
| InstallHandlers(array, maps, handlers); |
| } |
| |
| void StoreICNexus::ConfigurePolymorphic(MapHandleList* maps, |
| List<Handle<Object>>* handlers) { |
| Isolate* isolate = GetIsolate(); |
| int receiver_count = maps->length(); |
| Handle<FixedArray> array = EnsureArrayOfSize(receiver_count * 2); |
| InstallHandlers(array, maps, handlers); |
| SetFeedbackExtra(*FeedbackVector::UninitializedSentinel(isolate), |
| SKIP_WRITE_BARRIER); |
| } |
| |
| void KeyedStoreICNexus::ConfigurePolymorphic(Handle<Name> name, |
| MapHandleList* maps, |
| List<Handle<Object>>* handlers) { |
| int receiver_count = maps->length(); |
| DCHECK(receiver_count > 1); |
| Handle<FixedArray> array; |
| if (name.is_null()) { |
| array = EnsureArrayOfSize(receiver_count * 2); |
| SetFeedbackExtra(*FeedbackVector::UninitializedSentinel(GetIsolate()), |
| SKIP_WRITE_BARRIER); |
| } else { |
| array = EnsureExtraArrayOfSize(receiver_count * 2); |
| SetFeedback(*name); |
| } |
| |
| InstallHandlers(array, maps, handlers); |
| } |
| |
| void KeyedStoreICNexus::ConfigurePolymorphic(MapHandleList* maps, |
| MapHandleList* transitioned_maps, |
| List<Handle<Object>>* handlers) { |
| int receiver_count = maps->length(); |
| DCHECK(receiver_count > 1); |
| Handle<FixedArray> array = EnsureArrayOfSize(receiver_count * 3); |
| SetFeedbackExtra(*FeedbackVector::UninitializedSentinel(GetIsolate()), |
| SKIP_WRITE_BARRIER); |
| |
| Handle<Oddball> undefined_value = GetIsolate()->factory()->undefined_value(); |
| for (int i = 0; i < receiver_count; ++i) { |
| Handle<Map> map = maps->at(i); |
| Handle<WeakCell> cell = Map::WeakCellForMap(map); |
| array->set(i * 3, *cell); |
| if (!transitioned_maps->at(i).is_null()) { |
| Handle<Map> transitioned_map = transitioned_maps->at(i); |
| cell = Map::WeakCellForMap(transitioned_map); |
| array->set((i * 3) + 1, *cell); |
| } else { |
| array->set((i * 3) + 1, *undefined_value); |
| } |
| array->set((i * 3) + 2, *handlers->at(i)); |
| } |
| } |
| |
| namespace { |
| |
| int GetStepSize(FixedArray* array, Isolate* isolate) { |
| // The array should be of the form |
| // [map, handler, map, handler, ...] |
| // or |
| // [map, map, handler, map, map, handler, ...] |
| // where "map" is either a WeakCell or |undefined|, |
| // and "handler" is either a Code object or a Smi. |
| DCHECK(array->length() >= 2); |
| Object* second = array->get(1); |
| if (second->IsWeakCell() || second->IsUndefined(isolate)) return 3; |
| DCHECK(IC::IsHandler(second)); |
| return 2; |
| } |
| |
| } // namespace |
| |
| int FeedbackNexus::ExtractMaps(MapHandleList* maps) const { |
| Isolate* isolate = GetIsolate(); |
| Object* feedback = GetFeedback(); |
| bool is_named_feedback = IsPropertyNameFeedback(feedback); |
| if (feedback->IsFixedArray() || is_named_feedback) { |
| int found = 0; |
| if (is_named_feedback) { |
| feedback = GetFeedbackExtra(); |
| } |
| FixedArray* array = FixedArray::cast(feedback); |
| int increment = GetStepSize(array, isolate); |
| for (int i = 0; i < array->length(); i += increment) { |
| DCHECK(array->get(i)->IsWeakCell()); |
| WeakCell* cell = WeakCell::cast(array->get(i)); |
| if (!cell->cleared()) { |
| Map* map = Map::cast(cell->value()); |
| maps->Add(handle(map, isolate)); |
| found++; |
| } |
| } |
| return found; |
| } else if (feedback->IsWeakCell()) { |
| WeakCell* cell = WeakCell::cast(feedback); |
| if (!cell->cleared()) { |
| Map* map = Map::cast(cell->value()); |
| maps->Add(handle(map, isolate)); |
| return 1; |
| } |
| } |
| |
| return 0; |
| } |
| |
| MaybeHandle<Object> FeedbackNexus::FindHandlerForMap(Handle<Map> map) const { |
| Object* feedback = GetFeedback(); |
| Isolate* isolate = GetIsolate(); |
| bool is_named_feedback = IsPropertyNameFeedback(feedback); |
| if (feedback->IsFixedArray() || is_named_feedback) { |
| if (is_named_feedback) { |
| feedback = GetFeedbackExtra(); |
| } |
| FixedArray* array = FixedArray::cast(feedback); |
| int increment = GetStepSize(array, isolate); |
| for (int i = 0; i < array->length(); i += increment) { |
| DCHECK(array->get(i)->IsWeakCell()); |
| WeakCell* cell = WeakCell::cast(array->get(i)); |
| if (!cell->cleared()) { |
| Map* array_map = Map::cast(cell->value()); |
| if (array_map == *map) { |
| Object* code = array->get(i + increment - 1); |
| DCHECK(IC::IsHandler(code)); |
| return handle(code, isolate); |
| } |
| } |
| } |
| } else if (feedback->IsWeakCell()) { |
| WeakCell* cell = WeakCell::cast(feedback); |
| if (!cell->cleared()) { |
| Map* cell_map = Map::cast(cell->value()); |
| if (cell_map == *map) { |
| Object* code = GetFeedbackExtra(); |
| DCHECK(IC::IsHandler(code)); |
| return handle(code, isolate); |
| } |
| } |
| } |
| |
| return MaybeHandle<Code>(); |
| } |
| |
| bool FeedbackNexus::FindHandlers(List<Handle<Object>>* code_list, |
| int length) const { |
| Object* feedback = GetFeedback(); |
| Isolate* isolate = GetIsolate(); |
| int count = 0; |
| bool is_named_feedback = IsPropertyNameFeedback(feedback); |
| if (feedback->IsFixedArray() || is_named_feedback) { |
| if (is_named_feedback) { |
| feedback = GetFeedbackExtra(); |
| } |
| FixedArray* array = FixedArray::cast(feedback); |
| int increment = GetStepSize(array, isolate); |
| for (int i = 0; i < array->length(); i += increment) { |
| DCHECK(array->get(i)->IsWeakCell()); |
| WeakCell* cell = WeakCell::cast(array->get(i)); |
| // Be sure to skip handlers whose maps have been cleared. |
| if (!cell->cleared()) { |
| Object* code = array->get(i + increment - 1); |
| DCHECK(IC::IsHandler(code)); |
| code_list->Add(handle(code, isolate)); |
| count++; |
| } |
| } |
| } else if (feedback->IsWeakCell()) { |
| WeakCell* cell = WeakCell::cast(feedback); |
| if (!cell->cleared()) { |
| Object* code = GetFeedbackExtra(); |
| DCHECK(IC::IsHandler(code)); |
| code_list->Add(handle(code, isolate)); |
| count++; |
| } |
| } |
| return count == length; |
| } |
| |
| Name* KeyedLoadICNexus::FindFirstName() const { |
| Object* feedback = GetFeedback(); |
| if (IsPropertyNameFeedback(feedback)) { |
| return Name::cast(feedback); |
| } |
| return NULL; |
| } |
| |
| Name* KeyedStoreICNexus::FindFirstName() const { |
| Object* feedback = GetFeedback(); |
| if (IsPropertyNameFeedback(feedback)) { |
| return Name::cast(feedback); |
| } |
| return NULL; |
| } |
| |
| KeyedAccessStoreMode KeyedStoreICNexus::GetKeyedAccessStoreMode() const { |
| KeyedAccessStoreMode mode = STANDARD_STORE; |
| MapHandleList maps; |
| List<Handle<Object>> handlers; |
| |
| if (GetKeyType() == PROPERTY) return mode; |
| |
| ExtractMaps(&maps); |
| FindHandlers(&handlers, maps.length()); |
| for (int i = 0; i < handlers.length(); i++) { |
| // The first handler that isn't the slow handler will have the bits we need. |
| Handle<Object> maybe_code_handler = handlers.at(i); |
| Handle<Code> handler; |
| if (maybe_code_handler->IsTuple2()) { |
| Handle<Tuple2> data_handler = Handle<Tuple2>::cast(maybe_code_handler); |
| handler = handle(Code::cast(data_handler->value2())); |
| } else { |
| handler = Handle<Code>::cast(maybe_code_handler); |
| } |
| CodeStub::Major major_key = CodeStub::MajorKeyFromKey(handler->stub_key()); |
| uint32_t minor_key = CodeStub::MinorKeyFromKey(handler->stub_key()); |
| CHECK(major_key == CodeStub::KeyedStoreSloppyArguments || |
| major_key == CodeStub::StoreFastElement || |
| major_key == CodeStub::StoreSlowElement || |
| major_key == CodeStub::ElementsTransitionAndStore || |
| major_key == CodeStub::NoCache); |
| if (major_key != CodeStub::NoCache) { |
| mode = CommonStoreModeBits::decode(minor_key); |
| break; |
| } |
| } |
| |
| return mode; |
| } |
| |
| IcCheckType KeyedLoadICNexus::GetKeyType() const { |
| Object* feedback = GetFeedback(); |
| if (feedback == *FeedbackVector::MegamorphicSentinel(GetIsolate())) { |
| return static_cast<IcCheckType>(Smi::cast(GetFeedbackExtra())->value()); |
| } |
| return IsPropertyNameFeedback(feedback) ? PROPERTY : ELEMENT; |
| } |
| |
| IcCheckType KeyedStoreICNexus::GetKeyType() const { |
| Object* feedback = GetFeedback(); |
| if (feedback == *FeedbackVector::MegamorphicSentinel(GetIsolate())) { |
| return static_cast<IcCheckType>(Smi::cast(GetFeedbackExtra())->value()); |
| } |
| return IsPropertyNameFeedback(feedback) ? PROPERTY : ELEMENT; |
| } |
| |
| InlineCacheState BinaryOpICNexus::StateFromFeedback() const { |
| BinaryOperationHint hint = GetBinaryOperationFeedback(); |
| if (hint == BinaryOperationHint::kNone) { |
| return UNINITIALIZED; |
| } else if (hint == BinaryOperationHint::kAny) { |
| return GENERIC; |
| } |
| |
| return MONOMORPHIC; |
| } |
| |
| InlineCacheState CompareICNexus::StateFromFeedback() const { |
| CompareOperationHint hint = GetCompareOperationFeedback(); |
| if (hint == CompareOperationHint::kNone) { |
| return UNINITIALIZED; |
| } else if (hint == CompareOperationHint::kAny) { |
| return GENERIC; |
| } |
| |
| return MONOMORPHIC; |
| } |
| |
| BinaryOperationHint BinaryOpICNexus::GetBinaryOperationFeedback() const { |
| int feedback = Smi::cast(GetFeedback())->value(); |
| return BinaryOperationHintFromFeedback(feedback); |
| } |
| |
| CompareOperationHint CompareICNexus::GetCompareOperationFeedback() const { |
| int feedback = Smi::cast(GetFeedback())->value(); |
| return CompareOperationHintFromFeedback(feedback); |
| } |
| |
| InlineCacheState StoreDataPropertyInLiteralICNexus::StateFromFeedback() const { |
| Isolate* isolate = GetIsolate(); |
| Object* feedback = GetFeedback(); |
| |
| if (feedback == *FeedbackVector::UninitializedSentinel(isolate)) { |
| return UNINITIALIZED; |
| } else if (feedback->IsWeakCell()) { |
| // Don't check if the map is cleared. |
| return MONOMORPHIC; |
| } |
| |
| return MEGAMORPHIC; |
| } |
| |
| void StoreDataPropertyInLiteralICNexus::ConfigureMonomorphic( |
| Handle<Name> name, Handle<Map> receiver_map) { |
| Handle<WeakCell> cell = Map::WeakCellForMap(receiver_map); |
| |
| SetFeedback(*cell); |
| SetFeedbackExtra(*name); |
| } |
| |
| } // namespace internal |
| } // namespace v8 |