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// Copyright 2012 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.
#ifndef V8_TYPE_FEEDBACK_VECTOR_INL_H_
#define V8_TYPE_FEEDBACK_VECTOR_INL_H_
#include "src/type-feedback-vector.h"
namespace v8 {
namespace internal {
template <typename Derived>
FeedbackVectorSlot FeedbackVectorSpecBase<Derived>::AddSlot(
FeedbackVectorSlotKind kind) {
Derived* derived = static_cast<Derived*>(this);
int slot = derived->slots();
int entries_per_slot = TypeFeedbackMetadata::GetSlotSize(kind);
derived->append(kind);
for (int i = 1; i < entries_per_slot; i++) {
derived->append(FeedbackVectorSlotKind::INVALID);
}
return FeedbackVectorSlot(slot);
}
// static
TypeFeedbackMetadata* TypeFeedbackMetadata::cast(Object* obj) {
DCHECK(obj->IsTypeFeedbackVector());
return reinterpret_cast<TypeFeedbackMetadata*>(obj);
}
int TypeFeedbackMetadata::slot_count() const {
if (length() == 0) return 0;
DCHECK(length() > kReservedIndexCount);
return Smi::cast(get(kSlotsCountIndex))->value();
}
// static
TypeFeedbackVector* TypeFeedbackVector::cast(Object* obj) {
DCHECK(obj->IsTypeFeedbackVector());
return reinterpret_cast<TypeFeedbackVector*>(obj);
}
int TypeFeedbackMetadata::GetSlotSize(FeedbackVectorSlotKind kind) {
DCHECK_NE(FeedbackVectorSlotKind::INVALID, kind);
DCHECK_NE(FeedbackVectorSlotKind::KINDS_NUMBER, kind);
return kind == FeedbackVectorSlotKind::GENERAL ? 1 : 2;
}
bool TypeFeedbackVector::is_empty() const {
if (length() == 0) return true;
DCHECK(length() > kReservedIndexCount);
return false;
}
int TypeFeedbackVector::slot_count() const {
if (length() == 0) return 0;
DCHECK(length() > kReservedIndexCount);
return length() - kReservedIndexCount;
}
TypeFeedbackMetadata* TypeFeedbackVector::metadata() const {
return is_empty() ? TypeFeedbackMetadata::cast(GetHeap()->empty_fixed_array())
: TypeFeedbackMetadata::cast(get(kMetadataIndex));
}
FeedbackVectorSlotKind TypeFeedbackVector::GetKind(
FeedbackVectorSlot slot) const {
DCHECK(!is_empty());
return metadata()->GetKind(slot);
}
int TypeFeedbackVector::ic_with_type_info_count() {
return length() > 0 ? Smi::cast(get(kWithTypesIndex))->value() : 0;
}
void TypeFeedbackVector::change_ic_with_type_info_count(int delta) {
if (delta == 0) return;
int value = ic_with_type_info_count() + delta;
// Could go negative because of the debugger.
if (value >= 0) {
set(kWithTypesIndex, Smi::FromInt(value));
}
}
int TypeFeedbackVector::ic_generic_count() {
return length() > 0 ? Smi::cast(get(kGenericCountIndex))->value() : 0;
}
void TypeFeedbackVector::change_ic_generic_count(int delta) {
if (delta == 0) return;
int value = ic_generic_count() + delta;
if (value >= 0) {
set(kGenericCountIndex, Smi::FromInt(value));
}
}
int TypeFeedbackVector::GetIndex(FeedbackVectorSlot slot) const {
DCHECK(slot.ToInt() < slot_count());
return kReservedIndexCount + slot.ToInt();
}
// Conversion from an integer index to either a slot or an ic slot. The caller
// should know what kind she expects.
FeedbackVectorSlot TypeFeedbackVector::ToSlot(int index) const {
DCHECK(index >= kReservedIndexCount && index < length());
return FeedbackVectorSlot(index - kReservedIndexCount);
}
Object* TypeFeedbackVector::Get(FeedbackVectorSlot slot) const {
return get(GetIndex(slot));
}
void TypeFeedbackVector::Set(FeedbackVectorSlot slot, Object* value,
WriteBarrierMode mode) {
set(GetIndex(slot), value, mode);
}
Handle<Object> TypeFeedbackVector::UninitializedSentinel(Isolate* isolate) {
return isolate->factory()->uninitialized_symbol();
}
Handle<Object> TypeFeedbackVector::MegamorphicSentinel(Isolate* isolate) {
return isolate->factory()->megamorphic_symbol();
}
Handle<Object> TypeFeedbackVector::PremonomorphicSentinel(Isolate* isolate) {
return isolate->factory()->premonomorphic_symbol();
}
Object* TypeFeedbackVector::RawUninitializedSentinel(Isolate* isolate) {
return isolate->heap()->uninitialized_symbol();
}
Object* FeedbackNexus::GetFeedback() const { return vector()->Get(slot()); }
Object* FeedbackNexus::GetFeedbackExtra() const {
#ifdef DEBUG
FeedbackVectorSlotKind kind = vector()->GetKind(slot());
DCHECK_LT(1, TypeFeedbackMetadata::GetSlotSize(kind));
#endif
int extra_index = vector()->GetIndex(slot()) + 1;
return vector()->get(extra_index);
}
void FeedbackNexus::SetFeedback(Object* feedback, WriteBarrierMode mode) {
vector()->Set(slot(), feedback, mode);
}
void FeedbackNexus::SetFeedbackExtra(Object* feedback_extra,
WriteBarrierMode mode) {
#ifdef DEBUG
FeedbackVectorSlotKind kind = vector()->GetKind(slot());
DCHECK_LT(1, TypeFeedbackMetadata::GetSlotSize(kind));
#endif
int index = vector()->GetIndex(slot()) + 1;
vector()->set(index, feedback_extra, mode);
}
Isolate* FeedbackNexus::GetIsolate() const { return vector()->GetIsolate(); }
} // namespace internal
} // namespace v8
#endif // V8_TYPE_FEEDBACK_VECTOR_INL_H_
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