Add an IC for CompareNil operations

src/objects.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 4319 matching lines @@
   V(BUILTIN)              \
   V(LOAD_IC)              \
   V(KEYED_LOAD_IC)        \
   V(CALL_IC)              \
   V(KEYED_CALL_IC)        \
   V(STORE_IC)             \
   V(KEYED_STORE_IC)       \
   V(UNARY_OP_IC)          \
   V(BINARY_OP_IC)         \
   V(COMPARE_IC)           \
+  V(COMPARE_NIL_IC)       \
   V(TO_BOOLEAN_IC)
 
   enum Kind {
 #define DEFINE_CODE_KIND_ENUM(name) name,
     CODE_KIND_LIST(DEFINE_CODE_KIND_ENUM)
 #undef DEFINE_CODE_KIND_ENUM
 
     // Pseudo-kinds.
     LAST_CODE_KIND = TO_BOOLEAN_IC,
     REGEXP = BUILTIN,
@@ skipping 106 matching lines @@
   inline bool is_debug_break();
   inline bool is_load_stub() { return kind() == LOAD_IC; }
   inline bool is_keyed_load_stub() { return kind() == KEYED_LOAD_IC; }
   inline bool is_store_stub() { return kind() == STORE_IC; }
   inline bool is_keyed_store_stub() { return kind() == KEYED_STORE_IC; }
   inline bool is_call_stub() { return kind() == CALL_IC; }
   inline bool is_keyed_call_stub() { return kind() == KEYED_CALL_IC; }
   inline bool is_unary_op_stub() { return kind() == UNARY_OP_IC; }
   inline bool is_binary_op_stub() { return kind() == BINARY_OP_IC; }
   inline bool is_compare_ic_stub() { return kind() == COMPARE_IC; }
+  inline bool is_compare_nil_ic_stub() { return kind() == COMPARE_NIL_IC; }
   inline bool is_to_boolean_ic_stub() { return kind() == TO_BOOLEAN_IC; }
 
   // [major_key]: For kind STUB or BINARY_OP_IC, the major key.
   inline int major_key();
   inline void set_major_key(int value);
 
   // For kind STUB or ICs, tells whether or not a code object was generated by
   // the optimizing compiler (but it may not be an optimized function).
   bool is_crankshafted();
   inline void set_is_crankshafted(bool value);
@@ skipping 58 matching lines @@
   inline void set_check_type(CheckType value);
 
   // [type-recording unary op type]: For kind UNARY_OP_IC.
   inline byte unary_op_type();
   inline void set_unary_op_type(byte value);
 
   // [to_boolean_foo]: For kind TO_BOOLEAN_IC tells what state the stub is in.
   inline byte to_boolean_state();
   inline void set_to_boolean_state(byte value);
 
+  // [compare_nil]: For kind COMPARE_NIL_IC tells what state the stub is in.
+  inline byte compare_nil_state();
+
   // [has_function_cache]: For kind STUB tells whether there is a function
   // cache is passed to the stub.
   inline bool has_function_cache();
   inline void set_has_function_cache(bool flag);
 
 
   // [marked_for_deoptimization]: For kind OPTIMIZED_FUNCTION tells whether
   // the code is going to be deoptimized because of dead embedded maps.
   inline bool marked_for_deoptimization();
   inline void set_marked_for_deoptimization(bool flag);
 
   bool allowed_in_shared_map_code_cache();
 
   // Get the safepoint entry for the given pc.
   SafepointEntry GetSafepointEntry(Address pc);
 
   // Find the first map in an IC stub.
   Map* FindFirstMap();
   void FindAllMaps(MapHandleList* maps);
+  void ReplaceFirstMap(Map* replace);
 
   // Find the first code in an IC stub.
   Code* FindFirstCode();
   void FindAllCode(CodeHandleList* code_list, int length);
 
   class ExtraICStateStrictMode: public BitField<StrictModeFlag, 0, 1> {};
   class ExtraICStateKeyedAccessStoreMode:
       public BitField<KeyedAccessStoreMode, 1, 4> {};  // NOLINT
 
   class ExtraICStateStubHolder: public BitField<StubHolder, 0, 1> {};
@@ skipping 4832 matching lines @@
     } else {
       value &= ~(1 << bit_position);
     }
     return value;
   }
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_H_