Introduce FeedbackVectorSlot type - better than int.

src/hydrogen-instructions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HYDROGEN_INSTRUCTIONS_H_
 #define V8_HYDROGEN_INSTRUCTIONS_H_
 
 #include <iosfwd>
 
 #include "src/v8.h"
@@ skipping 5456 matching lines @@
 
 class HLoadGlobalGeneric FINAL : public HTemplateInstruction<2> {
  public:
   DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P3(HLoadGlobalGeneric, HValue*,
                                               Handle<String>, bool);
 
   HValue* context() { return OperandAt(0); }
   HValue* global_object() { return OperandAt(1); }
   Handle<String> name() const { return name_; }
   bool for_typeof() const { return for_typeof_; }
-  int slot() const {
-    DCHECK(FLAG_vector_ics && slot_ != AstNode::kInvalidFeedbackSlot);
+  FeedbackVectorSlot slot() const {
+    DCHECK(FLAG_vector_ics && !slot_.IsInvalid());
     return slot_;
   }
   Handle<FixedArray> feedback_vector() const { return feedback_vector_; }
-  void SetVectorAndSlot(Handle<FixedArray> vector, int slot) {
+  void SetVectorAndSlot(Handle<FixedArray> vector, FeedbackVectorSlot slot) {
     DCHECK(FLAG_vector_ics);
     feedback_vector_ = vector;
     slot_ = slot;
   }
 
   virtual std::ostream& PrintDataTo(std::ostream& os) const OVERRIDE;  // NOLINT
 
   virtual Representation RequiredInputRepresentation(int index) OVERRIDE {
     return Representation::Tagged();
   }
 
   DECLARE_CONCRETE_INSTRUCTION(LoadGlobalGeneric)
 
  private:
   HLoadGlobalGeneric(HValue* context, HValue* global_object,
                      Handle<String> name, bool for_typeof)
       : name_(name),
         for_typeof_(for_typeof),
-        slot_(AstNode::kInvalidFeedbackSlot) {
+        slot_(FeedbackVectorSlot::Invalid()) {
     SetOperandAt(0, context);
     SetOperandAt(1, global_object);
     set_representation(Representation::Tagged());
     SetAllSideEffects();
   }
 
   Handle<String> name_;
   bool for_typeof_;
   Handle<FixedArray> feedback_vector_;
-  int slot_;
+  FeedbackVectorSlot slot_;
 };
 
 
 class HAllocate FINAL : public HTemplateInstruction<2> {
  public:
   static bool CompatibleInstanceTypes(InstanceType type1,
                                       InstanceType type2) {
     return ComputeFlags(TENURED, type1) == ComputeFlags(TENURED, type2) &&
         ComputeFlags(NOT_TENURED, type1) == ComputeFlags(NOT_TENURED, type2);
   }
@@ skipping 950 matching lines @@
 
 class HLoadNamedGeneric FINAL : public HTemplateInstruction<2> {
  public:
   DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P2(HLoadNamedGeneric, HValue*,
                                               Handle<Object>);
 
   HValue* context() const { return OperandAt(0); }
   HValue* object() const { return OperandAt(1); }
   Handle<Object> name() const { return name_; }
 
-  int slot() const {
-    DCHECK(FLAG_vector_ics && slot_ != AstNode::kInvalidFeedbackSlot);
+  FeedbackVectorSlot slot() const {
+    DCHECK(FLAG_vector_ics && !slot_.IsInvalid());
     return slot_;
   }
   Handle<FixedArray> feedback_vector() const { return feedback_vector_; }
-  void SetVectorAndSlot(Handle<FixedArray> vector, int slot) {
+  void SetVectorAndSlot(Handle<FixedArray> vector, FeedbackVectorSlot slot) {
     DCHECK(FLAG_vector_ics);
     feedback_vector_ = vector;
     slot_ = slot;
   }
 
   virtual Representation RequiredInputRepresentation(int index) OVERRIDE {
     return Representation::Tagged();
   }
 
   virtual std::ostream& PrintDataTo(std::ostream& os) const OVERRIDE;  // NOLINT
 
   DECLARE_CONCRETE_INSTRUCTION(LoadNamedGeneric)
 
  private:
   HLoadNamedGeneric(HValue* context, HValue* object, Handle<Object> name)
-      : name_(name), slot_(AstNode::kInvalidFeedbackSlot) {
+      : name_(name), slot_(FeedbackVectorSlot::Invalid()) {
     SetOperandAt(0, context);
     SetOperandAt(1, object);
     set_representation(Representation::Tagged());
     SetAllSideEffects();
   }
 
   Handle<Object> name_;
   Handle<FixedArray> feedback_vector_;
-  int slot_;
+  FeedbackVectorSlot slot_;
 };
 
 
 class HLoadFunctionPrototype FINAL : public HUnaryOperation {
  public:
   DECLARE_INSTRUCTION_FACTORY_P1(HLoadFunctionPrototype, HValue*);
 
   HValue* function() { return OperandAt(0); }
 
   virtual Representation RequiredInputRepresentation(int index) OVERRIDE {
@@ skipping 225 matching lines @@
 };
 
 
 class HLoadKeyedGeneric FINAL : public HTemplateInstruction<3> {
  public:
   DECLARE_INSTRUCTION_WITH_CONTEXT_FACTORY_P2(HLoadKeyedGeneric, HValue*,
                                               HValue*);
   HValue* object() const { return OperandAt(0); }
   HValue* key() const { return OperandAt(1); }
   HValue* context() const { return OperandAt(2); }
-  int slot() const {
-    DCHECK(FLAG_vector_ics && slot_ != AstNode::kInvalidFeedbackSlot);
+  FeedbackVectorSlot slot() const {
+    DCHECK(FLAG_vector_ics && !slot_.IsInvalid());
     return slot_;
   }
   Handle<FixedArray> feedback_vector() const { return feedback_vector_; }
-  void SetVectorAndSlot(Handle<FixedArray> vector, int slot) {
+  void SetVectorAndSlot(Handle<FixedArray> vector, FeedbackVectorSlot slot) {
     DCHECK(FLAG_vector_ics);
     feedback_vector_ = vector;
     slot_ = slot;
   }
 
   virtual std::ostream& PrintDataTo(std::ostream& os) const OVERRIDE;  // NOLINT
 
   virtual Representation RequiredInputRepresentation(int index) OVERRIDE {
     // tagged[tagged]
     return Representation::Tagged();
   }
 
   virtual HValue* Canonicalize() OVERRIDE;
 
   DECLARE_CONCRETE_INSTRUCTION(LoadKeyedGeneric)
 
  private:
   HLoadKeyedGeneric(HValue* context, HValue* obj, HValue* key)
-      : slot_(AstNode::kInvalidFeedbackSlot) {
+      : slot_(FeedbackVectorSlot::Invalid()) {
     set_representation(Representation::Tagged());
     SetOperandAt(0, obj);
     SetOperandAt(1, key);
     SetOperandAt(2, context);
     SetAllSideEffects();
   }
 
   Handle<FixedArray> feedback_vector_;
-  int slot_;
+  FeedbackVectorSlot slot_;
 };
 
 
 // Indicates whether the store is a store to an entry that was previously
 // initialized or not.
 enum StoreFieldOrKeyedMode {
   // The entry could be either previously initialized or not.
   INITIALIZING_STORE,
   // At the time of this store it is guaranteed that the entry is already
   // initialized.
@@ skipping 1094 matching lines @@
 };
 
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_