Collect type profile for DevTools.

src/feedback-vector.h

Index: src/feedback-vector.h
diff --git a/src/feedback-vector.h b/src/feedback-vector.h
index 9ac146d5113dbf70a325f2ac7a5d6b2b226b329e..a2fabb3bc18bbf66531c0dee344b405aac02e94c 100644
--- a/src/feedback-vector.h
+++ b/src/feedback-vector.h
@@ -36,6 +36,7 @@ enum class FeedbackSlotKind {
   kCompareOp,
   kToBoolean,
   kStoreDataPropertyInLiteral,
+  kTypeProfile,
   kCreateClosure,
   kLiteral,
   // This is a general purpose slot that occupies one feedback vector element.
@@ -150,6 +151,11 @@ class FeedbackVectorSpecBase {
     return AddSlot(FeedbackSlotKind::kStoreDataPropertyInLiteral);
   }
 
+  FeedbackSlot AddTypeProfileSlot() {
+    DCHECK(true || FLAG_type_profile);
+    return AddSlot(FeedbackSlotKind::kTypeProfile);
+  }
+
 #ifdef OBJECT_PRINT
   // For gdb debugging.
   void Print();
@@ -742,6 +748,27 @@ class StoreDataPropertyInLiteralICNexus : public FeedbackNexus {
   InlineCacheState StateFromFeedback() const override;
 };
 
+// For each assignment, store the types seen so far in the feedback.
+// Feedback is either a Name or an ArrayList with Names.
+// If we've seen too many types, we consider this feedback
+// megamorphic and useless.
+class CollectTypeProfileICNexus : public FeedbackNexus {
+ public:
+  CollectTypeProfileICNexus(Handle<FeedbackVector> vector, FeedbackSlot slot)
+      : FeedbackNexus(vector, slot) {
+    DCHECK_EQ(FeedbackSlotKind::kTypeProfile, vector->GetKind(slot));
+  }
+  CollectTypeProfileICNexus(FeedbackVector* vector, FeedbackSlot slot)
+      : FeedbackNexus(vector, slot) {
+    DCHECK_EQ(FeedbackSlotKind::kTypeProfile, vector->GetKind(slot));
+  }
+
+  void ConfigureMonomorphic(Handle<Name> type);
+  void ConfigurePolymorphic(Handle<Name> type);
+
+  InlineCacheState StateFromFeedback() const override;
+};
+
 inline BinaryOperationHint BinaryOperationHintFromFeedback(int type_feedback);
 inline CompareOperationHint CompareOperationHintFromFeedback(int type_feedback);