Cache number of type arguments in class object instead of recalculating it.

runtime/vm/object.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_OBJECT_H_
 #define VM_OBJECT_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/utils.h"
@@ skipping 711 matching lines @@
   static intptr_t type_parameters_offset() {
     return OFFSET_OF(RawClass, type_parameters_);
   }
 
   // Return a TypeParameter if the type_name is a type parameter of this class.
   // Return null otherwise.
   RawTypeParameter* LookupTypeParameter(const String& type_name) const;
 
   // The type argument vector is flattened and includes the type arguments of
   // the super class.
-  bool HasTypeArguments() const;
   intptr_t NumTypeArguments() const;
 
   // Return the number of type arguments that are specific to this class, i.e.
   // not overlapping with the type arguments of the super class of this class.
   intptr_t NumOwnTypeArguments() const;
 
   // If this class is parameterized, each instance has a type_arguments field.
   static const intptr_t kNoTypeArguments = -1;
   intptr_t type_arguments_field_offset() const {
     ASSERT(is_type_finalized() || is_prefinalized());
@@ skipping 199 matching lines @@
   bool is_mixin_typedef() const {
     return MixinTypedefBit::decode(raw_ptr()->state_bits_);
   }
   void set_is_mixin_typedef() const;
 
   bool is_mixin_type_applied() const {
     return MixinTypeAppliedBit::decode(raw_ptr()->state_bits_);
   }
   void set_is_mixin_type_applied() const;
 
-  int num_native_fields() const {
+  uint16_t num_native_fields() const {
     return raw_ptr()->num_native_fields_;
   }
-  void set_num_native_fields(int value) const {
+  void set_num_native_fields(uint16_t value) const {
     raw_ptr()->num_native_fields_ = value;
   }
-  static intptr_t num_native_fields_offset() {
-    return OFFSET_OF(RawClass, num_native_fields_);
-  }
 
   RawCode* allocation_stub() const {
     return raw_ptr()->allocation_stub_;
   }
   void set_allocation_stub(const Code& value) const;
 
   RawArray* constants() const;
 
   RawFunction* GetInvocationDispatcher(const String& target_name,
                                        const Array& args_desc,
@@ skipping 98 matching lines @@
   void set_canonical_types(const Array& value) const;
   RawArray* canonical_types() const;
 
   RawArray* invocation_dispatcher_cache() const;
   void set_invocation_dispatcher_cache(const Array& cache) const;
   RawFunction* CreateInvocationDispatcher(const String& target_name,
                                           const Array& args_desc,
                                           RawFunction::Kind kind) const;
   void CalculateFieldOffsets() const;
 
+  // Initial value for the cached number of type arguments.
+  static const intptr_t kUnknownNumTypeArguments = -1;
+
+  int16_t num_type_arguments() const {
+    return raw_ptr()->num_type_arguments_;
+  }
+  void set_num_type_arguments(intptr_t value) const;
+
+  int16_t num_own_type_arguments() const {
+    return raw_ptr()->num_own_type_arguments_;
+  }
+  void set_num_own_type_arguments(intptr_t value) const;
+
   // Assigns empty array to all raw class array fields.
   void InitEmptyFields();
 
   static RawFunction* CheckFunctionType(const Function& func, intptr_t type);
   RawFunction* LookupFunction(const String& name, intptr_t type) const;
   RawFunction* LookupFunctionAllowPrivate(const String& name,
                                           intptr_t type) const;
   RawField* LookupField(const String& name, intptr_t type) const;
 
   RawFunction* LookupAccessorFunction(const char* prefix,
@@ skipping 5174 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_