New class for Date objects: caches individual date components.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 862afe5d3a644bdccc9f918236653baa31e5b03b..730af4a0d9d680c18760d2559cc0df697a15067d 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -6564,6 +6564,18 @@ void HGraphBuilder::GenerateValueOf(CallRuntime* call) {
 }
 
 
+void HGraphBuilder::GenerateDateField(CallRuntime* call) {
+  ASSERT(call->arguments()->length() == 2);
+  ASSERT_NE(NULL, call->arguments()->at(1)->AsLiteral());
+  int index =
+      Smi::cast(*(call->arguments()->at(1)->AsLiteral()->handle()))->value();
+  CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
+  HValue* date = Pop();
+  HDateField* result = new(zone()) HDateField(date, index);
+  return ast_context()->ReturnInstruction(result, call->id());
+}
+
+
 void HGraphBuilder::GenerateSetValueOf(CallRuntime* call) {
   ASSERT(call->arguments()->length() == 2);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
@@ -6606,6 +6618,22 @@ void HGraphBuilder::GenerateSetValueOf(CallRuntime* call) {
 }
 
 
+void HGraphBuilder::GenerateSetDateField(CallRuntime* call) {
+  ASSERT(call->arguments()->length() == 3);
+  ASSERT_NE(NULL, call->arguments()->at(1)->AsLiteral());
+  int index =
+      Smi::cast(*(call->arguments()->at(1)->AsLiteral()->handle()))->value();
+  CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
+  CHECK_ALIVE(VisitForValue(call->arguments()->at(2)));
+  HValue* value = Pop();
+  HValue* date = Pop();
+  HValue* context = environment()->LookupContext();
+  HSetDateField* result =
+      new(zone()) HSetDateField(context, date, value, index);
+  return ast_context()->ReturnInstruction(result, call->id());
+}
+
+
 // Fast support for charCodeAt(n).
 void HGraphBuilder::GenerateStringCharCodeAt(CallRuntime* call) {
   ASSERT(call->arguments()->length() == 2);