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..5300253fba0a61f1ce9181b66f5224ce83cae5e9 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* value = Pop();
+  HDateField* result = new(zone()) HDateField(value, 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 +6618,52 @@ 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* object = Pop();
+  // Check if object is a not a smi.
+  HIsSmiAndBranch* smicheck = new(zone()) HIsSmiAndBranch(object);
+  HBasicBlock* if_smi = graph()->CreateBasicBlock();
+  HBasicBlock* if_heap_object = graph()->CreateBasicBlock();
+  HBasicBlock* join = graph()->CreateBasicBlock();
+  smicheck->SetSuccessorAt(0, if_smi);
+  smicheck->SetSuccessorAt(1, if_heap_object);
+  current_block()->Finish(smicheck);
+  if_smi->Goto(join);
+
+  // Check if object is a JSDate.
+  set_current_block(if_heap_object);
+  HHasInstanceTypeAndBranch* typecheck =
+      new(zone()) HHasInstanceTypeAndBranch(object, JS_DATE_TYPE);
+  HBasicBlock* if_js_date = graph()->CreateBasicBlock();
+  HBasicBlock* not_js_date = graph()->CreateBasicBlock();
+  typecheck->SetSuccessorAt(0, if_js_date);
+  typecheck->SetSuccessorAt(1, not_js_date);
+  current_block()->Finish(typecheck);
+  not_js_date->Goto(join);
+
+  // Create in-object property store to right offset.
+  set_current_block(if_js_date);
+  Handle<String> name = isolate()->factory()->undefined_symbol();
+  AddInstruction(
+      new HStoreNamedField(object,
+                           name,
+                           value,
+                           true,  // in-object store.
+                           JSDate::kYearOffset + kPointerSize * index));
+  if_js_date->Goto(join);
+  join->SetJoinId(call->id());
+  set_current_block(join);
+  return ast_context()->ReturnValue(value);
+}
+
+
 // Fast support for charCodeAt(n).
 void HGraphBuilder::GenerateStringCharCodeAt(CallRuntime* call) {
   ASSERT(call->arguments()->length() == 2);