Wrap JSFunction bindings in a helper object

src/objects.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_OBJECTS_H_
 #define V8_OBJECTS_H_
 
 #include <iosfwd>
 
 #include "src/allocation.h"
@@ skipping 59 matching lines @@
 //           - JSDate
 //         - JSMessageObject
 //       - JSProxy
 //         - JSFunctionProxy
 //     - FixedArrayBase
 //       - ByteArray
 //       - BytecodeArray
 //       - FixedArray
 //         - DescriptorArray
 //         - LiteralsArray
+//         - BindingsArray
 //         - HashTable
 //           - Dictionary
 //           - StringTable
 //           - CompilationCacheTable
 //           - CodeCacheHashTable
 //           - MapCache
 //         - OrderedHashTable
 //           - OrderedHashSet
 //           - OrderedHashMap
 //         - Context
@@ skipping 844 matching lines @@
   V(BytecodeArray)                 \
   V(FreeSpace)                     \
   V(JSReceiver)                    \
   V(JSObject)                      \
   V(JSContextExtensionObject)      \
   V(JSGeneratorObject)             \
   V(JSModule)                      \
   V(LayoutDescriptor)              \
   V(Map)                           \
   V(DescriptorArray)               \
+  V(BindingsArray)                 \
   V(TransitionArray)               \
   V(LiteralsArray)                 \
   V(TypeFeedbackVector)            \
   V(DeoptimizationInputData)       \
   V(DeoptimizationOutputData)      \
   V(DependentCode)                 \
   V(HandlerTable)                  \
   V(FixedArray)                    \
   V(FixedDoubleArray)              \
   V(WeakFixedArray)                \
@@ skipping 3644 matching lines @@
   DECLARE_CAST(LiteralsArray)
 
  private:
   inline Object* get(int index) const;
   inline void set(int index, Object* value);
   inline void set(int index, Smi* value);
   inline void set(int index, Object* value, WriteBarrierMode mode);
 };
 
 
+// A bindings array contains the bindings for a bound function. It also holds
+// the type feedback vector.
+class BindingsArray : public FixedArray {
+ public:
+  inline TypeFeedbackVector* feedback_vector() const;
+  inline void set_feedback_vector(TypeFeedbackVector* vector);
+
+  inline JSReceiver* bound_function() const;
+  inline void set_bound_function(JSReceiver* function);
+  inline Object* bound_this() const;
+  inline void set_bound_this(Object* bound_this);
+
+  inline Object* binding(int binding_index) const;
+  inline void set_binding(int binding_index, Object* binding);
+  inline int bindings_count() const;
+
+  static Handle<BindingsArray> New(Isolate* isolate,
+                                   Handle<TypeFeedbackVector> vector,
+                                   Handle<JSReceiver> bound_function,
+                                   Handle<Object> bound_this,
+                                   int number_of_bindings);
+
+  static Handle<JSArray> CreateBoundArguments(Handle<BindingsArray> bindings);
+  static Handle<JSArray> CreateRuntimeBindings(Handle<BindingsArray> bindings);
+
+  DECLARE_CAST(BindingsArray)
+
+ private:
+  static const int kVectorIndex = 0;
+  static const int kBoundFunctionIndex = 1;
+  static const int kBoundThisIndex = 2;
+  static const int kFirstBindingIndex = 3;
+
+  inline Object* get(int index) const;
+  inline void set(int index, Object* value);
+  inline void set(int index, Smi* value);
+  inline void set(int index, Object* value, WriteBarrierMode mode);
+
+  inline int length() const;
+};
+
+
 // HandlerTable is a fixed array containing entries for exception handlers in
 // the code object it is associated with. The tables comes in two flavors:
 // 1) Based on ranges: Used for unoptimized code. Contains one entry per
 //    exception handler and a range representing the try-block covered by that
 //    handler. Layout looks as follows:
 //      [ range-start , range-end , handler-offset , stack-depth ]
 // 2) Based on return addresses: Used for turbofanned code. Contains one entry
 //    per call-site that could throw an exception. Layout looks as follows:
 //      [ return-address-offset , handler-offset ]
 class HandlerTable : public FixedArray {
@@ skipping 2550 matching lines @@
   // access to.
   //
   // On bound functions, the array is a (copy-on-write) fixed-array containing
   // the function that was bound, bound this-value and any bound
   // arguments. Bound functions never contain literals.
   DECL_ACCESSORS(literals_or_bindings, FixedArray)
 
   inline LiteralsArray* literals();
   inline void set_literals(LiteralsArray* literals);
 
-  inline FixedArray* function_bindings();
-  inline void set_function_bindings(FixedArray* bindings);
+  inline BindingsArray* function_bindings();
+  inline void set_function_bindings(BindingsArray* bindings);
 
   // The initial map for an object created by this constructor.
   inline Map* initial_map();
   static void SetInitialMap(Handle<JSFunction> function, Handle<Map> map,
                             Handle<Object> prototype);
   inline bool has_initial_map();
   static void EnsureHasInitialMap(Handle<JSFunction> function);
 
   // Get and set the prototype property on a JSFunction. If the
   // function has an initial map the prototype is set on the initial
@@ skipping 66 matching lines @@
   static const int kPrototypeOrInitialMapOffset =
       kCodeEntryOffset + kPointerSize;
   static const int kSharedFunctionInfoOffset =
       kPrototypeOrInitialMapOffset + kPointerSize;
   static const int kContextOffset = kSharedFunctionInfoOffset + kPointerSize;
   static const int kLiteralsOffset = kContextOffset + kPointerSize;
   static const int kNonWeakFieldsEndOffset = kLiteralsOffset + kPointerSize;
   static const int kNextFunctionLinkOffset = kNonWeakFieldsEndOffset;
   static const int kSize = kNextFunctionLinkOffset + kPointerSize;
 
-  // Layout of the bound-function binding array.
-  static const int kBoundFunctionIndex = 0;
-  static const int kBoundThisIndex = 1;
-  static const int kBoundArgumentsStartIndex = 2;
-
  private:
   DISALLOW_IMPLICIT_CONSTRUCTORS(JSFunction);
 };
 
 
 // JSGlobalProxy's prototype must be a JSGlobalObject or null,
 // and the prototype is hidden. JSGlobalProxy always delegates
 // property accesses to its prototype if the prototype is not null.
 //
 // A JSGlobalProxy can be reinitialized which will preserve its identity.
@@ skipping 3339 matching lines @@
 
   Isolate* isolate_;
   Handle<FixedArray> keys_;
   Handle<OrderedHashSet> set_;
   int length_;
   DISALLOW_COPY_AND_ASSIGN(KeyAccumulator);
 };
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_