[interpreter] Compute and use type info percentage

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/globals.h"
 #include "src/type-feedback-vector.h"
 
@@ skipping 130 matching lines @@
     case CompareOperationFeedback::kSignedSmall:
       return CompareOperationHint::kSignedSmall;
     case CompareOperationFeedback::kNumber:
       return CompareOperationHint::kNumber;
     default:
       return CompareOperationHint::kAny;
   }
 }
 
 void TypeFeedbackVector::ComputeCounts(int* with_type_info, int* generic,
+                                       int* interpreter_total,
                                        bool code_is_interpreted) {
   Object* uninitialized_sentinel =
       TypeFeedbackVector::RawUninitializedSentinel(GetIsolate());
   Object* megamorphic_sentinel =
       *TypeFeedbackVector::MegamorphicSentinel(GetIsolate());
   int with = 0;
   int gen = 0;
+  int total = 0;
   TypeFeedbackMetadataIterator iter(metadata());
   while (iter.HasNext()) {
     FeedbackVectorSlot slot = iter.Next();
     FeedbackVectorSlotKind kind = iter.kind();
 
     Object* obj = Get(slot);
-    if (obj != uninitialized_sentinel &&
-        kind != FeedbackVectorSlotKind::GENERAL) {
+    if (kind == FeedbackVectorSlotKind::GENERAL) {
+      continue;
+    }
+    total++;
+
+    if (obj != uninitialized_sentinel) {
       if (kind == FeedbackVectorSlotKind::INTERPRETER_COMPARE_IC ||
           kind == FeedbackVectorSlotKind::INTERPRETER_BINARYOP_IC) {
         // If we are not running interpreted code, we need to ignore
         // the special ic slots for binaryop/compare used by the
         // interpreter.
         // TODO(mvstanton): Remove code_is_interpreted when full code
         // is retired from service.
         if (!code_is_interpreted) continue;
 
         DCHECK(obj->IsSmi());
@@ skipping 19 matching lines @@
       } else if (obj->IsWeakCell() || obj->IsFixedArray() || obj->IsString()) {
         with++;
       } else if (obj == megamorphic_sentinel) {
         gen++;
       }
     }
   }
 
   *with_type_info = with;
   *generic = gen;
+  *interpreter_total = total;
 }
 
 Handle<Symbol> TypeFeedbackVector::UninitializedSentinel(Isolate* isolate) {
   return isolate->factory()->uninitialized_symbol();
 }
 
 Handle<Symbol> TypeFeedbackVector::MegamorphicSentinel(Isolate* isolate) {
   return isolate->factory()->megamorphic_symbol();
 }
 
@@ skipping 48 matching lines @@
   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_