Avoid adding HWrapReceiver during graph building.

This adds an early check to the graph builder which prevents adding an
HWrapReceiver instruction if the receiver type is already known at graph
building time. Also HAllocate no longer unnecessarily postpones setting
it's type until type inference but sets it right away. These changes are
in preparation for escape analysis.

R=titzer@chromium.org

Review URL: https://codereview.chromium.org/19493005

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@15843 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/hydrogen-instructions.cc

@@ -3244,11 +3244,6 @@ HType HStringCharFromCode::CalculateInferredType() {
 }
 
 
-HType HAllocate::CalculateInferredType() {
-  return type_;
-}
-
-
 void HAllocate::HandleSideEffectDominator(GVNFlag side_effect,
                                           HValue* dominator) {
   ASSERT(side_effect == kChangesNewSpacePromotion);

src/hydrogen-instructions.h

@@ -4919,10 +4919,10 @@ class HAllocate: public HTemplateInstruction<2> {
   };
 
   HAllocate(HValue* context, HValue* size, HType type, Flags flags)
-      : type_(type),
-        flags_(flags) {
+      : flags_(flags) {
     SetOperandAt(0, context);
     SetOperandAt(1, size);
+    set_type(type);
     set_representation(Representation::Tagged());
     SetFlag(kTrackSideEffectDominators);
     SetGVNFlag(kChangesNewSpacePromotion);
@@ -4947,7 +4947,6 @@ class HAllocate: public HTemplateInstruction<2> {
 
   HValue* context() { return OperandAt(0); }
   HValue* size() { return OperandAt(1); }
-  HType type() { return type_; }
 
   virtual Representation RequiredInputRepresentation(int index) {
     if (index == 0) {
@@ -4965,8 +4964,6 @@ class HAllocate: public HTemplateInstruction<2> {
     known_initial_map_ = known_initial_map;
   }
 
-  virtual HType CalculateInferredType();
-
   bool CanAllocateInNewSpace() const {
     return (flags_ & CAN_ALLOCATE_IN_NEW_SPACE) != 0;
   }
@@ -5012,7 +5009,6 @@ class HAllocate: public HTemplateInstruction<2> {
   DECLARE_CONCRETE_INSTRUCTION(Allocate)
 
  private:
-  HType type_;
   Flags flags_;
   Handle<Map> known_initial_map_;
 };
@@ -5021,10 +5017,10 @@ class HAllocate: public HTemplateInstruction<2> {
 class HInnerAllocatedObject: public HTemplateInstruction<1> {
  public:
   HInnerAllocatedObject(HValue* value, int offset, HType type = HType::Tagged())
-      : offset_(offset),
-        type_(type) {
+      : offset_(offset) {
     ASSERT(value->IsAllocate());
     SetOperandAt(0, value);
+    set_type(type);
     set_representation(Representation::Tagged());
   }
 
@@ -5035,15 +5031,12 @@ class HInnerAllocatedObject: public HTemplateInstruction<1> {
     return Representation::Tagged();
   }
 
-  virtual HType CalculateInferredType() { return type_; }
-
   virtual void PrintDataTo(StringStream* stream);
 
   DECLARE_CONCRETE_INSTRUCTION(InnerAllocatedObject)
 
  private:
   int offset_;
-  HType type_;
 };
 
 

src/hydrogen.cc

@@ -1040,14 +1040,19 @@ void HGraphBuilder::PadEnvironmentForContinuation(
 }
 
 
-HValue* HGraphBuilder::BuildCheckMap(HValue* obj,
-                                     Handle<Map> map) {
+HValue* HGraphBuilder::BuildCheckMap(HValue* obj, Handle<Map> map) {
   HCheckMaps* check = HCheckMaps::New(obj, map, zone(), top_info());
   AddInstruction(check);
   return check;
 }
 
 
+HValue* HGraphBuilder::BuildWrapReceiver(HValue* object, HValue* function) {
+  if (object->type().IsJSObject()) return object;
+  return Add<HWrapReceiver>(object, function);
+}
+
+
 HValue* HGraphBuilder::BuildCheckForCapacityGrow(HValue* object,
                                                  HValue* elements,
                                                  ElementsKind kind,
@@ -6886,7 +6891,7 @@ bool HOptimizedGraphBuilder::TryCallApply(Call* expr) {
   if (function_state()->outer() == NULL) {
     HInstruction* elements = Add<HArgumentsElements>(false);
     HInstruction* length = Add<HArgumentsLength>(elements);
-    HValue* wrapped_receiver = Add<HWrapReceiver>(receiver, function);
+    HValue* wrapped_receiver = BuildWrapReceiver(receiver, function);
     HInstruction* result =
         new(zone()) HApplyArguments(function,
                                     wrapped_receiver,
@@ -6903,7 +6908,7 @@ bool HOptimizedGraphBuilder::TryCallApply(Call* expr) {
     HArgumentsObject* args = function_state()->entry()->arguments_object();
     const ZoneList<HValue*>* arguments_values = args->arguments_values();
     int arguments_count = arguments_values->length();
-    PushAndAdd(new(zone()) HWrapReceiver(receiver, function));
+    Push(BuildWrapReceiver(receiver, function));
     for (int i = 1; i < arguments_count; i++) {
       Push(arguments_values->at(i));
     }

src/hydrogen.h

@@ -1038,6 +1038,7 @@ class HGraphBuilder {
 
   HValue* BuildCheckHeapObject(HValue* object);
   HValue* BuildCheckMap(HValue* obj, Handle<Map> map);
+  HValue* BuildWrapReceiver(HValue* object, HValue* function);
 
   // Building common constructs
   HValue* BuildCheckForCapacityGrow(HValue* object,