Vector ICs: ClassLiterals need to allocate a vector slot for home objects.

src/ast.cc

Index: src/ast.cc
diff --git a/src/ast.cc b/src/ast.cc
index 5141a382f00100ec8dd3ab4f883fcae53a90e3ef..06846ffb8f5c431c938beb5ced8bb0f2ad55d0b2 100644
--- a/src/ast.cc
+++ b/src/ast.cc
@@ -294,6 +294,41 @@ ObjectLiteralProperty::ObjectLiteralProperty(AstValueFactory* ast_value_factory,
 }
 
 
+FeedbackVectorRequirements ClassLiteral::ComputeFeedbackRequirements(
+    Isolate* isolate, const ICSlotCache* cache) {
+  if (!FLAG_vector_stores) return FeedbackVectorRequirements(0, 0);
+
+  // This logic that computes the number of slots needed for vector store
+  // ICs must mirror FullCodeGenerator::VisitClassLiteral.
+  int ic_slots = 0;
+  for (int i = 0; i < properties()->length(); i++) {
+    ObjectLiteral::Property* property = properties()->at(i);
+
+    Expression* value = property->value();
+    if (FunctionLiteral::NeedsHomeObject(value)) ic_slots++;
+  }
+
+#ifdef DEBUG
+  // FullCodeGenerator::VisitClassLiteral verifies that it consumes slot_count_
+  // slots.
+  slot_count_ = ic_slots;
+#endif
+  return FeedbackVectorRequirements(0, ic_slots);
+}
+
+
+FeedbackVectorICSlot ClassLiteral::SlotForHomeObject(Expression* value,
+                                                     int* slot_index) const {
+  if (FLAG_vector_stores && FunctionLiteral::NeedsHomeObject(value)) {
+    DCHECK(slot_index != NULL && *slot_index >= 0 && *slot_index < slot_count_);
+    FeedbackVectorICSlot slot = GetNthSlot(*slot_index);
+    *slot_index += 1;
+    return slot;
+  }
+  return FeedbackVectorICSlot::Invalid();
+}
+
+
 bool ObjectLiteral::Property::IsCompileTimeValue() {
   return kind_ == CONSTANT ||
       (kind_ == MATERIALIZED_LITERAL &&