Start adding support for elements to the LookupIterator

src/lookup.h

 // Copyright 2014 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_LOOKUP_H_
 #define V8_LOOKUP_H_
 
 #include "src/factory.h"
 #include "src/isolate.h"
 #include "src/objects.h"
@@ skipping 34 matching lines @@
 
   LookupIterator(Handle<Object> receiver, Handle<Name> name,
                  Configuration configuration = PROTOTYPE_CHAIN)
       : configuration_(ComputeConfiguration(configuration, name)),
         state_(NOT_FOUND),
         exotic_index_state_(ExoticIndexState::kUninitialized),
         interceptor_state_(InterceptorState::kUninitialized),
         property_details_(PropertyDetails::Empty()),
         isolate_(name->GetIsolate()),
         name_(name),
+        // kMaxUInt32 isn't a valid index.
+        index_(kMaxUInt32),
         receiver_(receiver),
         holder_(GetRoot(receiver_, isolate_)),
         holder_map_(holder_->map(), isolate_),
         initial_holder_(holder_),
         number_(DescriptorArray::kNotFound) {
     Next();
   }
 
   LookupIterator(Handle<Object> receiver, Handle<Name> name,
                  Handle<JSReceiver> holder,
                  Configuration configuration = PROTOTYPE_CHAIN)
       : configuration_(ComputeConfiguration(configuration, name)),
         state_(NOT_FOUND),
         exotic_index_state_(ExoticIndexState::kUninitialized),
         interceptor_state_(InterceptorState::kUninitialized),
         property_details_(PropertyDetails::Empty()),
         isolate_(name->GetIsolate()),
         name_(name),
+        // kMaxUInt32 isn't a valid index.
+        index_(kMaxUInt32),
         receiver_(receiver),
         holder_(holder),
         holder_map_(holder_->map(), isolate_),
         initial_holder_(holder_),
         number_(DescriptorArray::kNotFound) {
     Next();
   }
 
+  LookupIterator(Isolate* isolate, Handle<Object> receiver, uint32_t index,
+                 Configuration configuration = PROTOTYPE_CHAIN)
+      : configuration_(configuration),
+        state_(NOT_FOUND),
+        exotic_index_state_(ExoticIndexState::kNotExotic),
+        interceptor_state_(InterceptorState::kUninitialized),
+        property_details_(PropertyDetails::Empty()),
+        isolate_(isolate),
+        name_(),
+        index_(index),
+        receiver_(receiver),
+        holder_(GetRoot(receiver_, isolate_)),
+        holder_map_(holder_->map(), isolate_),
+        initial_holder_(holder_),
+        number_(DescriptorArray::kNotFound) {
+    // kMaxUInt32 isn't a valid index.
+    DCHECK_NE(kMaxUInt32, index_);
+    Next();
+  }
+
+  LookupIterator(Isolate* isolate, Handle<Object> receiver, uint32_t index,
+                 Handle<JSReceiver> holder,
+                 Configuration configuration = PROTOTYPE_CHAIN)
+      : configuration_(configuration),
+        state_(NOT_FOUND),
+        exotic_index_state_(ExoticIndexState::kNotExotic),
+        interceptor_state_(InterceptorState::kUninitialized),
+        property_details_(PropertyDetails::Empty()),
+        isolate_(isolate),
+        name_(),
+        index_(index),
+        receiver_(receiver),
+        holder_(holder),
+        holder_map_(holder_->map(), isolate_),
+        initial_holder_(holder_),
+        number_(DescriptorArray::kNotFound) {
+    // kMaxUInt32 isn't a valid index.
+    DCHECK_NE(kMaxUInt32, index_);
+    Next();
+  }
+
   Isolate* isolate() const { return isolate_; }
   State state() const { return state_; }
+
   Handle<Name> name() const { return name_; }
+  uint32_t index() const { return index_; }
+
+  bool IsElement() const { return index_ != kMaxUInt32; }
 
   bool IsFound() const { return state_ != NOT_FOUND; }
   void Next();
   void NotFound() {
     has_property_ = false;
     state_ = NOT_FOUND;
   }
 
   Factory* factory() const { return isolate_->factory(); }
   Handle<Object> GetReceiver() const { return receiver_; }
@@ skipping 60 matching lines @@
 
   Handle<Map> GetReceiverMap() const;
 
   MUST_USE_RESULT inline JSReceiver* NextHolder(Map* map);
   inline State LookupInHolder(Map* map, JSReceiver* holder);
   void RestartLookupForNonMaskingInterceptors();
   State LookupNonMaskingInterceptorInHolder(Map* map, JSReceiver* holder);
   Handle<Object> FetchValue() const;
   void ReloadPropertyInformation();
   bool SkipInterceptor(JSObject* holder);
+  bool HasInterceptor(Map* map) const;
 
   bool IsBootstrapping() const;
 
   bool check_hidden() const { return (configuration_ & kHidden) != 0; }
   bool check_interceptor() const {
     return !IsBootstrapping() && (configuration_ & kInterceptor) != 0;
   }
   bool check_prototype_chain() const {
     return (configuration_ & kPrototypeChain) != 0;
   }
@@ skipping 11 matching lines @@
   static Configuration ComputeConfiguration(
       Configuration configuration, Handle<Name> name) {
     if (name->IsOwn()) {
       return static_cast<Configuration>(configuration &
                                         HIDDEN_SKIP_INTERCEPTOR);
     } else {
       return configuration;
     }
   }
 
-  enum class ExoticIndexState { kUninitialized, kNoIndex, kIndex };
+  enum class ExoticIndexState { kUninitialized, kNotExotic, kExotic };
   bool IsIntegerIndexedExotic(JSReceiver* holder);
 
   // If configuration_ becomes mutable, update
   // HolderIsReceiverOrHiddenPrototype.
   const Configuration configuration_;
   State state_;
   bool has_property_;
   ExoticIndexState exotic_index_state_;
   InterceptorState interceptor_state_;
   PropertyDetails property_details_;
   Isolate* const isolate_;
   Handle<Name> name_;
+  uint32_t index_;
   Handle<Object> transition_;
   const Handle<Object> receiver_;
   Handle<JSReceiver> holder_;
   Handle<Map> holder_map_;
   const Handle<JSReceiver> initial_holder_;
-  int number_;
+  uint32_t number_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_LOOKUP_H_