Implement tracking and optimizations of packed arrays.

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 9682ec81177ad8014b58d07a433e766c2dacb72a..b464df6160fed53151a58df20afccb8ec0b2911a 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -1675,6 +1675,9 @@ void HLoadKeyedFastElement::PrintDataTo(StringStream* stream) {
   stream->Add("[");
   key()->PrintNameTo(stream);
   stream->Add("]");
+  if (hole_check_mode_ == PERFORM_HOLE_CHECK) {
+    stream->Add(" check_hole");
+  }
 }
 
 
@@ -1726,7 +1729,7 @@ HValue* HLoadKeyedGeneric::Canonicalize() {
         HInstruction* index = new(block()->zone()) HLoadKeyedFastElement(
             index_cache,
             key_load->key(),
-            HLoadKeyedFastElement::OMIT_HOLE_CHECK);
+            OMIT_HOLE_CHECK);
         HLoadFieldByIndex* load = new(block()->zone()) HLoadFieldByIndex(
             object(), index);
         map_check->InsertBefore(this);
@@ -1774,8 +1777,11 @@ void HLoadKeyedSpecializedArrayElement::PrintDataTo(
       stream->Add("pixel");
       break;
     case FAST_ELEMENTS:
-    case FAST_SMI_ONLY_ELEMENTS:
+    case FAST_SMI_ELEMENTS:
     case FAST_DOUBLE_ELEMENTS:
+    case FAST_HOLEY_ELEMENTS:
+    case FAST_HOLEY_SMI_ELEMENTS:
+    case FAST_HOLEY_DOUBLE_ELEMENTS:
     case DICTIONARY_ELEMENTS:
     case NON_STRICT_ARGUMENTS_ELEMENTS:
       UNREACHABLE();
@@ -1872,9 +1878,12 @@ void HStoreKeyedSpecializedArrayElement::PrintDataTo(
     case EXTERNAL_PIXEL_ELEMENTS:
       stream->Add("pixel");
       break;
-    case FAST_SMI_ONLY_ELEMENTS:
+    case FAST_SMI_ELEMENTS:
     case FAST_ELEMENTS:
     case FAST_DOUBLE_ELEMENTS:
+    case FAST_HOLEY_SMI_ELEMENTS:
+    case FAST_HOLEY_ELEMENTS:
+    case FAST_HOLEY_DOUBLE_ELEMENTS:
     case DICTIONARY_ELEMENTS:
     case NON_STRICT_ARGUMENTS_ELEMENTS:
       UNREACHABLE();
@@ -1889,7 +1898,13 @@ void HStoreKeyedSpecializedArrayElement::PrintDataTo(
 
 void HTransitionElementsKind::PrintDataTo(StringStream* stream) {
   object()->PrintNameTo(stream);
-  stream->Add(" %p -> %p", *original_map(), *transitioned_map());
+  ElementsKind from_kind = original_map()->elements_kind();
+  ElementsKind to_kind = transitioned_map()->elements_kind();
+  stream->Add(" %p [%s] -> %p [%s]",
+              *original_map(),
+              ElementsAccessor::ForKind(from_kind)->name(),
+              *transitioned_map(),
+              ElementsAccessor::ForKind(to_kind)->name());
 }