Crankshaft support for polymorphic array handling

src/ast.cc

Index: src/ast.cc
diff --git a/src/ast.cc b/src/ast.cc
index 03df229963ec00771500449589e04640e657c2df..18412df9d6abb1f266a970b88232adcb59fde528 100644
--- a/src/ast.cc
+++ b/src/ast.cc
@@ -607,6 +607,10 @@ void Property::RecordTypeFeedback(TypeFeedbackOracle* oracle) {
     is_string_access_ = true;
   } else if (is_monomorphic_) {
     monomorphic_receiver_type_ = oracle->LoadMonomorphicReceiverType(this);
+  } else if (oracle->LoadIsMegamorphicWithTypeInfo(this)) {
+    // TODO(jkummerow): use constant instead of "4".

[fschneider, 2011/06/17 08:59:34]

You could use sth. like kMaxKeyedLoadPolymorphism. We have such constants
already for normal polymorphic access and calls.

[Jakob Kummerow, 2011/06/17 17:43:14]

Done.

+    receiver_types_ = new ZoneMapList(4);
+    oracle->CollectKeyedReceiverTypes(this->id(), receiver_types_);
   }
 }
 
@@ -622,8 +626,12 @@ void Assignment::RecordTypeFeedback(TypeFeedbackOracle* oracle) {
     ZoneMapList* types = oracle->StoreReceiverTypes(this, name);
     receiver_types_ = types;
   } else if (is_monomorphic_) {
-    // Record receiver type for monomorphic keyed loads.
+    // Record receiver type for monomorphic keyed stores.
     monomorphic_receiver_type_ = oracle->StoreMonomorphicReceiverType(this);
+  } else if (oracle->StoreIsMegamorphicWithTypeInfo(this)) {
+    // TODO(jkummerow): use constant instead of "4".
+    receiver_types_ = new ZoneMapList(4);
+    oracle->CollectKeyedReceiverTypes(this->id(), receiver_types_);
   }
 }
 
@@ -631,8 +639,12 @@ void Assignment::RecordTypeFeedback(TypeFeedbackOracle* oracle) {
 void CountOperation::RecordTypeFeedback(TypeFeedbackOracle* oracle) {
   is_monomorphic_ = oracle->StoreIsMonomorphicNormal(this);
   if (is_monomorphic_) {
-    // Record receiver type for monomorphic keyed loads.
+    // Record receiver type for monomorphic keyed stores.
     monomorphic_receiver_type_ = oracle->StoreMonomorphicReceiverType(this);
+  } else if (oracle->StoreIsMegamorphicWithTypeInfo(this)) {
+    // TODO(jkummerow): use constant instead of "4".
+    receiver_types_ = new ZoneMapList(4);
+    oracle->CollectKeyedReceiverTypes(this->id(), receiver_types_);
   }
 }