Reimplement Function.prototype.bind.

src/objects.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 5020 matching lines @@
   static const int kCompilerHintsSmiTagSize = 0;
   static const int kCompilerHintsSize = kIntSize;
 #endif
 
   STATIC_ASSERT(SharedFunctionInfo::kCompilerHintsCount <=
                 SharedFunctionInfo::kCompilerHintsSize * kBitsPerByte);
 
  public:
   // Constants for optimizing codegen for strict mode function and
   // native tests.
-  // Allows to use byte-widgh instructions.
+  // Allows to use byte-width instructions.
   static const int kStrictModeBitWithinByte =
       (kStrictModeFunction + kCompilerHintsSmiTagSize) % kBitsPerByte;
 
   static const int kNativeBitWithinByte =
       (kNative + kCompilerHintsSmiTagSize) % kBitsPerByte;
 
 #if __BYTE_ORDER == __LITTLE_ENDIAN
   static const int kStrictModeByteOffset = kCompilerHintsOffset +
       (kStrictModeFunction + kCompilerHintsSmiTagSize) / kBitsPerByte;
   static const int kNativeByteOffset = kCompilerHintsOffset +
@@ skipping 57 matching lines @@
   // recompiled the next time it is executed.
   void MarkForLazyRecompilation();
 
   // Tells whether or not the function is already marked for lazy
   // recompilation.
   inline bool IsMarkedForLazyRecompilation();
 
   // Check whether or not this function is inlineable.
   bool IsInlineable();
 
-  // [literals]: Fixed array holding the materialized literals.
+  // [literals_or_bindings]: Fixed array holding either
+  // the materialized literals or the bindings of a bound function.
   //
   // If the function contains object, regexp or array literals, the
   // literals array prefix contains the object, regexp, and array
   // function to be used when creating these literals.  This is
   // necessary so that we do not dynamically lookup the object, regexp
   // or array functions.  Performing a dynamic lookup, we might end up
   // using the functions from a new context that we should not have
   // access to.
-  DECL_ACCESSORS(literals, FixedArray)
+  //
+  // 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 FixedArray* literals();
+  inline void set_literals(FixedArray* literals);
+
+  inline FixedArray* function_bindings();
+  inline void set_function_bindings(FixedArray* bindings);
 
   // The initial map for an object created by this constructor.
   inline Map* initial_map();
   inline void set_initial_map(Map* value);
   inline bool has_initial_map();
 
   // Get and set the prototype property on a JSFunction. If the
   // function has an initial map the prototype is set on the initial
   // map. Otherwise, the prototype is put in the initial map field
   // until an initial map is needed.
@@ skipping 67 matching lines @@
   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 literals array.
   static const int kLiteralsPrefixSize = 1;
   static const int kLiteralGlobalContextIndex = 0;
 
+  // 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 2363 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_