Faster IC stubs by specializing them for Binary Smi operations

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 3433 matching lines @@
 
   // Return true if the target function of this IC data may check for (and
   // possibly issue) a Javascript compatibility warning.
   bool MayCheckForJSWarning() const;
 
   bool IsClosureCall() const;
   void SetIsClosureCall() const;
 
   intptr_t NumberOfChecks() const;
 
+  // Discounts any checks with usage of zero.
+  intptr_t NumberOfUsedChecks() const;
+
   static intptr_t InstanceSize() {
     return RoundedAllocationSize(sizeof(RawICData));
   }
 
   static intptr_t target_name_offset() {
     return OFFSET_OF(RawICData, target_name_);
   }
 
   static intptr_t state_bits_offset() {
     return OFFSET_OF(RawICData, state_bits_);
@@ skipping 29 matching lines @@
   void AddCheck(const GrowableArray<intptr_t>& class_ids,
                 const Function& target) const;
   // Adds sorted so that Smi is the first class-id. Use only for
   // num_args_tested == 1.
   void AddReceiverCheck(intptr_t receiver_class_id,
                         const Function& target,
                         intptr_t count = 1) const;
 
   // Retrieving checks.
 
+  // TODO(srdjan): GetCheckAt without target.
   void GetCheckAt(intptr_t index,
                   GrowableArray<intptr_t>* class_ids,
                   Function* target) const;
   // Only for 'num_args_checked == 1'.
   void GetOneClassCheckAt(intptr_t index,
                           intptr_t* class_id,
                           Function* target) const;
   // Only for 'num_args_checked == 1'.
   intptr_t GetCidAt(intptr_t index) const;
 
   intptr_t GetReceiverClassIdAt(intptr_t index) const;
   intptr_t GetClassIdAt(intptr_t index, intptr_t arg_nr) const;
 
   RawFunction* GetTargetAt(intptr_t index) const;
   RawFunction* GetTargetForReceiverClassId(intptr_t class_id) const;
 
   void IncrementCountAt(intptr_t index, intptr_t value) const;
   void SetCountAt(intptr_t index, intptr_t value) const;
   intptr_t GetCountAt(intptr_t index) const;
   intptr_t AggregateCount() const;
 
   // Returns this->raw() if num_args_tested == 1 and arg_nr == 1, otherwise
   // returns a new ICData object containing only unique arg_nr checks.
+  // Returns only used entries.
   RawICData* AsUnaryClassChecksForArgNr(intptr_t arg_nr) const;
   RawICData* AsUnaryClassChecks() const {
     return AsUnaryClassChecksForArgNr(0);
   }
 
+  // Consider only used entries.
   bool AllTargetsHaveSameOwner(intptr_t owner_cid) const;
   bool AllReceiversAreNumbers() const;
   bool HasOneTarget() const;
   bool HasReceiverClassId(intptr_t class_id) const;
 
   static RawICData* New(const Function& owner,
                         const String& target_name,
                         const Array& arguments_descriptor,
                         intptr_t deopt_id,
                         intptr_t num_args_tested);
 
   static intptr_t TestEntryLengthFor(intptr_t num_args);
 
   static intptr_t TargetIndexFor(intptr_t num_args) {
     return num_args;
   }
 
   static intptr_t CountIndexFor(intptr_t num_args) {
     return (num_args + 1);
   }
 
+  bool IsUsedAt(intptr_t i) const;
+
+  void GetUsedCidsForTwoArgs(GrowableArray<intptr_t>* first,
+                             GrowableArray<intptr_t>* second) const;
+
  private:
   RawArray* ic_data() const {
     return raw_ptr()->ic_data_;
   }
 
   void set_owner(const Function& value) const;
   void set_target_name(const String& value) const;
   void set_arguments_descriptor(const Array& value) const;
   void set_deopt_id(intptr_t value) const;
   void SetNumArgsTested(intptr_t value) const;
@@ skipping 3788 matching lines @@
 
 
 RawObject* MegamorphicCache::GetTargetFunction(const Array& array,
                                                intptr_t index) {
   return array.At((index * kEntryLength) + kTargetFunctionIndex);
 }
 
 }  // namespace dart
 
 #endif  // VM_OBJECT_H_