Distinction between FeedbackVectorICSlot and FeedbackVectorSlot eliminated.

src/type-feedback-vector-inl.h

 // 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 {
 
+
+FeedbackVectorSlot FeedbackVectorSpec::AddSlot(FeedbackVectorSlotKind kind) {
+  int slot = slots();
+  int entries_per_slot = TypeFeedbackVector::GetSlotSize(kind);
+  slot_kinds_.resize(
+      slot + entries_per_slot,
+      static_cast<unsigned char>(FeedbackVectorSlotKind::INVALID));
+  slot_kinds_[slot] = static_cast<unsigned char>(kind);
+  return FeedbackVectorSlot(slot);
+}
+
+
 // static
 TypeFeedbackVector* TypeFeedbackVector::cast(Object* obj) {
   DCHECK(obj->IsTypeFeedbackVector());
   return reinterpret_cast<TypeFeedbackVector*>(obj);
 }
 
 
-int TypeFeedbackVector::first_ic_slot_index() const {
-  DCHECK(length() >= kReservedIndexCount);
-  return Smi::cast(get(kFirstICSlotIndex))->value();
+int TypeFeedbackVector::GetSlotSize(FeedbackVectorSlotKind kind) {
+  DCHECK_NE(FeedbackVectorSlotKind::INVALID, kind);
+  DCHECK_NE(FeedbackVectorSlotKind::KINDS_NUMBER, kind);
+  return kind == FeedbackVectorSlotKind::STUB ? 1 : 2;
 }
 
 
+bool TypeFeedbackVector::is_empty() const {
+  if (length() == 0) return true;
+  DCHECK(length() >= kReservedIndexCount);
+  return false;
+}
+
+
+int TypeFeedbackVector::Slots() const {
+  if (length() == 0) return 0;
+  DCHECK(length() >= kReservedIndexCount);
+  return Smi::cast(get(kSlotsCountIndex))->value();
+}
+
+
 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::Slots() const {
-  if (length() == 0) return 0;
-  return Max(
-      0, first_ic_slot_index() - ic_metadata_length() - kReservedIndexCount);
-}
-
-
-int TypeFeedbackVector::ICSlots() const {
-  if (length() == 0) return 0;
-  return (length() - first_ic_slot_index()) / elements_per_ic_slot();
-}
-
-
 int TypeFeedbackVector::ic_metadata_length() const {
-  return VectorICComputer::word_count(ICSlots());
+  return VectorICComputer::word_count(Slots());
 }
 
 
-// Conversion from a slot or ic slot to an integer index to the underlying
-// array.
 int TypeFeedbackVector::GetIndex(FeedbackVectorSlot slot) const {
-  DCHECK(slot.ToInt() < first_ic_slot_index());
+  DCHECK(slot.ToInt() < Slots());
   return kReservedIndexCount + ic_metadata_length() + slot.ToInt();
 }
 
 
-int TypeFeedbackVector::GetIndex(FeedbackVectorICSlot slot) const {
-  int first_ic_slot = first_ic_slot_index();
-  DCHECK(slot.ToInt() < ICSlots());
-  return first_ic_slot + slot.ToInt() * elements_per_ic_slot();
-}
-
-
 // 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 < first_ic_slot_index());
+  DCHECK(index >= kReservedIndexCount + ic_metadata_length() &&
+         index < length());
   return FeedbackVectorSlot(index - ic_metadata_length() - kReservedIndexCount);
 }
 
 
-FeedbackVectorICSlot TypeFeedbackVector::ToICSlot(int index) const {
-  DCHECK(index >= first_ic_slot_index() && index < length());
-  int ic_slot = (index - first_ic_slot_index()) / elements_per_ic_slot();
-  return FeedbackVectorICSlot(ic_slot);
-}
-
-
 Object* TypeFeedbackVector::Get(FeedbackVectorSlot slot) const {
   return get(GetIndex(slot));
 }
 
 
 void TypeFeedbackVector::Set(FeedbackVectorSlot slot, Object* value,
                              WriteBarrierMode mode) {
   set(GetIndex(slot), value, mode);
 }
 
 
-Object* TypeFeedbackVector::Get(FeedbackVectorICSlot slot) const {
-  return get(GetIndex(slot));
-}
-
-
-void TypeFeedbackVector::Set(FeedbackVectorICSlot 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(Heap* heap) {
-  return heap->uninitialized_symbol();
+Object* TypeFeedbackVector::RawUninitializedSentinel(Isolate* isolate) {
+  return isolate->heap()->uninitialized_symbol();
 }
 
 
 Object* FeedbackNexus::GetFeedback() const { return vector()->Get(slot()); }
 
 
 Object* FeedbackNexus::GetFeedbackExtra() const {
-  DCHECK(TypeFeedbackVector::elements_per_ic_slot() > 1);
+#ifdef DEBUG
+  FeedbackVectorSlotKind kind = vector()->GetKind(slot());
+  DCHECK_LT(1, TypeFeedbackVector::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) {
-  DCHECK(TypeFeedbackVector::elements_per_ic_slot() > 1);
+#ifdef DEBUG
+  FeedbackVectorSlotKind kind = vector()->GetKind(slot());
+  DCHECK_LT(1, TypeFeedbackVector::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_