arrange to create prototypes for generators

src/contexts.h

 // Copyright 2012 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 147 matching lines @@
   V(ERROR_MESSAGE_FOR_CODE_GEN_FROM_STRINGS_INDEX, Object, \
     error_message_for_code_gen_from_strings) \
   V(TO_COMPLETE_PROPERTY_DESCRIPTOR_INDEX, JSFunction, \
     to_complete_property_descriptor) \
   V(DERIVED_HAS_TRAP_INDEX, JSFunction, derived_has_trap) \
   V(DERIVED_GET_TRAP_INDEX, JSFunction, derived_get_trap) \
   V(DERIVED_SET_TRAP_INDEX, JSFunction, derived_set_trap) \
   V(PROXY_ENUMERATE_INDEX, JSFunction, proxy_enumerate) \
   V(OBSERVERS_NOTIFY_CHANGE_INDEX, JSFunction, observers_notify_change) \
   V(OBSERVERS_DELIVER_CHANGES_INDEX, JSFunction, observers_deliver_changes) \
+  V(GENERATOR_FUNCTION_MAP_INDEX, Map, generator_function_map) \
+  V(STRICT_MODE_GENERATOR_FUNCTION_MAP_INDEX, Map, \
+    strict_mode_generator_function_map) \
+  V(GENERATOR_OBJECT_PROTOTYPE_MAP_INDEX, Map, \
+    generator_object_prototype_map) \
   V(RANDOM_SEED_INDEX, ByteArray, random_seed)
 
 // JSFunctions are pairs (context, function code), sometimes also called
 // closures. A Context object is used to represent function contexts and
 // dynamically pushed 'with' contexts (or 'scopes' in ECMA-262 speak).
 //
 // At runtime, the contexts build a stack in parallel to the execution
 // stack, with the top-most context being the current context. All contexts
 // have the following slots:
 //
@@ skipping 110 matching lines @@
     EMBEDDER_DATA_INDEX,
     ALLOW_CODE_GEN_FROM_STRINGS_INDEX,
     ERROR_MESSAGE_FOR_CODE_GEN_FROM_STRINGS_INDEX,
     TO_COMPLETE_PROPERTY_DESCRIPTOR_INDEX,
     DERIVED_HAS_TRAP_INDEX,
     DERIVED_GET_TRAP_INDEX,
     DERIVED_SET_TRAP_INDEX,
     PROXY_ENUMERATE_INDEX,
     OBSERVERS_NOTIFY_CHANGE_INDEX,
     OBSERVERS_DELIVER_CHANGES_INDEX,
+    GENERATOR_FUNCTION_MAP_INDEX,
+    STRICT_MODE_GENERATOR_FUNCTION_MAP_INDEX,
+    GENERATOR_OBJECT_PROTOTYPE_MAP_INDEX,
     RANDOM_SEED_INDEX,
 
     // Properties from here are treated as weak references by the full GC.
     // Scavenge treats them as strong references.
     OPTIMIZED_FUNCTIONS_LIST,  // Weak.
     MAP_CACHE_INDEX,  // Weak.
     NEXT_CONTEXT_LINK,  // Weak.
 
     // Total number of slots.
     NATIVE_CONTEXT_SLOTS,
@@ skipping 124 matching lines @@
                         ContextLookupFlags flags,
                         int* index,
                         PropertyAttributes* attributes,
                         BindingFlags* binding_flags);
 
   // Code generation support.
   static int SlotOffset(int index) {
     return kHeaderSize + index * kPointerSize - kHeapObjectTag;
   }
 
+  static int FunctionMapIndex(LanguageMode language_mode, bool is_generator) {
+    return is_generator
+      ? (language_mode == CLASSIC_MODE
+         ? GENERATOR_FUNCTION_MAP_INDEX
+         : STRICT_MODE_GENERATOR_FUNCTION_MAP_INDEX)
+      : (language_mode == CLASSIC_MODE
+         ? FUNCTION_MAP_INDEX
+         : STRICT_MODE_FUNCTION_MAP_INDEX);
+  }
+
   static const int kSize = kHeaderSize + NATIVE_CONTEXT_SLOTS * kPointerSize;
 
   // GC support.
   typedef FixedBodyDescriptor<
       kHeaderSize, kSize, kSize> ScavengeBodyDescriptor;
 
   typedef FixedBodyDescriptor<
       kHeaderSize,
       kHeaderSize + FIRST_WEAK_SLOT * kPointerSize,
       kSize> MarkCompactBodyDescriptor;
 
  private:
   // Unchecked access to the slots.
   Object* unchecked_previous() { return get(PREVIOUS_INDEX); }
 
 #ifdef DEBUG
   // Bootstrapping-aware type checks.
   static bool IsBootstrappingOrValidParentContext(Object* object, Context* kid);
   static bool IsBootstrappingOrGlobalObject(Object* object);
 #endif
 
   STATIC_CHECK(kHeaderSize == Internals::kContextHeaderSize);
   STATIC_CHECK(EMBEDDER_DATA_INDEX == Internals::kContextEmbedderDataIndex);
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_CONTEXTS_H_