Pass in the handler kind to IC computation rather than extracting it from the handler.

R=ishell@chromium.org

Review URL: https://codereview.chromium.org/163463002

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19383 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/ic.cc

@@ -643,7 +643,7 @@ bool IC::UpdatePolymorphicIC(Handle<HeapType> type,
   }
 
   Handle<Code> ic = isolate()->stub_cache()->ComputePolymorphicIC(
-      &types, &handlers, number_of_valid_types, name, extra_ic_state());
+      kind(), &types, &handlers, number_of_valid_types, name, extra_ic_state());
   set_target(*ic);
   return true;
 }
@@ -695,7 +695,7 @@ void IC::UpdateMonomorphicIC(Handle<HeapType> type,
                              Handle<String> name) {
   if (!handler->is_handler()) return set_target(*handler);
   Handle<Code> ic = isolate()->stub_cache()->ComputeMonomorphicIC(
-      name, type, handler, extra_ic_state());
+      kind(), name, type, handler, extra_ic_state());
   set_target(*ic);
 }
 

src/objects-inl.h

@@ -4204,12 +4204,6 @@ Code::StubType Code::type() {
 }
 
 
-int Code::arguments_count() {
-  ASSERT(kind() == STUB || is_handler());
-  return ExtractArgumentsCountFromFlags(flags());
-}
-
-
 // For initialization.
 void Code::set_raw_kind_specific_flags1(int value) {
   WRITE_INT_FIELD(this, kKindSpecificFlags1Offset, value);
@@ -4492,8 +4486,9 @@ Code::Flags Code::ComputeFlags(Kind kind,
       | TypeField::encode(type)
       | ExtraICStateField::encode(extra_ic_state)
       | CacheHolderField::encode(holder);
+  // TODO(verwaest): Move to the valid uses of |handler_kind|.
   if (handler_kind != STUB) {
-    bits |= (handler_kind << kArgumentsCountShift);
+    bits |= HandlerKindField::encode(handler_kind);
   }
   return static_cast<Flags>(bits);
 }
@@ -4529,11 +4524,6 @@ Code::StubType Code::ExtractTypeFromFlags(Flags flags) {
 }
 
 
-int Code::ExtractArgumentsCountFromFlags(Flags flags) {
-  return (flags & kArgumentsCountMask) >> kArgumentsCountShift;
-}
-
-
 InlineCacheHolderFlag Code::ExtractCacheHolderFromFlags(Flags flags) {
   return CacheHolderField::decode(flags);
 }

src/objects.h

@@ -5233,14 +5233,10 @@ class Code: public HeapObject {
 
   // [flags]: Access to specific code flags.
   inline Kind kind();
-  inline Kind handler_kind() {
-    return static_cast<Kind>(arguments_count());
-  }
   inline InlineCacheState ic_state();  // Only valid for IC stubs.
   inline ExtraICState extra_ic_state();  // Only valid for IC stubs.
 
   inline StubType type();  // Only valid for monomorphic IC stubs.
-  inline int arguments_count();  // Only valid for call IC stubs.
 
   // Testers for IC stub kinds.
   inline bool is_inline_cache_stub();
@@ -5394,7 +5390,6 @@ class Code: public HeapObject {
   static inline Kind ExtractKindFromFlags(Flags flags);
   static inline InlineCacheHolderFlag ExtractCacheHolderFromFlags(Flags flags);
   static inline ExtraICState ExtractExtraICStateFromFlags(Flags flags);
-  static inline int ExtractArgumentsCountFromFlags(Flags flags);
 
   static inline Flags RemoveTypeFromFlags(Flags flags);
 
@@ -5614,11 +5609,9 @@ class Code: public HeapObject {
   class BackEdgesPatchedForOSRField: public BitField<bool,
       kIsCrankshaftedBit + 1 + 29, 1> {};  // NOLINT
 
-  // Signed field cannot be encoded using the BitField class.
-  static const int kArgumentsCountShift = 17;
-  static const int kArgumentsCountMask = ~((1 << kArgumentsCountShift) - 1);
-  static const int kArgumentsBits =
-      PlatformSmiTagging::kSmiValueSize - Code::kArgumentsCountShift + 1;
+  class HandlerKindField: public BitField<Kind, 17, 4> {};
+
+  static const int kArgumentsBits = 16;
   static const int kMaxArguments = (1 << kArgumentsBits) - 1;
 
   // This constant should be encodable in an ARM instruction.

src/stub-cache.cc

@@ -127,11 +127,11 @@ Handle<Code> StubCache::FindHandler(Handle<Name> name,
 
 
 Handle<Code> StubCache::ComputeMonomorphicIC(
+    Code::Kind kind,
     Handle<Name> name,
     Handle<HeapType> type,
     Handle<Code> handler,
     ExtraICState extra_ic_state) {
-  Code::Kind kind = handler->handler_kind();
   InlineCacheHolderFlag flag = IC::GetCodeCacheFlag(*type);
 
   Handle<Map> stub_holder;
@@ -369,14 +369,13 @@ Handle<Code> StubCache::ComputeLoadElementPolymorphic(
 
 
 Handle<Code> StubCache::ComputePolymorphicIC(
+    Code::Kind kind,
     TypeHandleList* types,
     CodeHandleList* handlers,
     int number_of_valid_types,
     Handle<Name> name,
     ExtraICState extra_ic_state) {
-
   Handle<Code> handler = handlers->at(0);
-  Code::Kind kind = handler->handler_kind();
   Code::StubType type = number_of_valid_types == 1 ? handler->type()
                                                    : Code::NORMAL;
   if (kind == Code::LOAD_IC) {

src/stub-cache.h

@@ -91,7 +91,8 @@ class StubCache {
                            Code::Kind kind,
                            InlineCacheHolderFlag cache_holder = OWN_MAP);
 
-  Handle<Code> ComputeMonomorphicIC(Handle<Name> name,
+  Handle<Code> ComputeMonomorphicIC(Code::Kind kind,
+                                    Handle<Name> name,
                                     Handle<HeapType> type,
                                     Handle<Code> handler,
                                     ExtraICState extra_ic_state);
@@ -122,7 +123,8 @@ class StubCache {
                                               KeyedAccessStoreMode store_mode,
                                               StrictModeFlag strict_mode);
 
-  Handle<Code> ComputePolymorphicIC(TypeHandleList* types,
+  Handle<Code> ComputePolymorphicIC(Code::Kind kind,
+                                    TypeHandleList* types,
                                     CodeHandleList* handlers,
                                     int number_of_valid_maps,
                                     Handle<Name> name,