Add an IC for CompareNil operations

src/objects-inl.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 3645 matching lines @@
   int updated = IsCrankshaftedField::update(previous, value);
   WRITE_UINT32_FIELD(this, kKindSpecificFlags2Offset, updated);
 }
 
 
 int Code::major_key() {
   ASSERT(kind() == STUB ||
          kind() == UNARY_OP_IC ||
          kind() == BINARY_OP_IC ||
          kind() == COMPARE_IC ||
+         kind() == COMPARE_NIL_IC ||
          kind() == LOAD_IC ||
          kind() == KEYED_LOAD_IC ||
          kind() == TO_BOOLEAN_IC);
   return StubMajorKeyField::decode(
       READ_UINT32_FIELD(this, kKindSpecificFlags2Offset));
 }
 
 
 void Code::set_major_key(int major) {
   ASSERT(kind() == STUB ||
          kind() == UNARY_OP_IC ||
          kind() == BINARY_OP_IC ||
          kind() == COMPARE_IC ||
+         kind() == COMPARE_NIL_IC ||
          kind() == LOAD_IC ||
          kind() == KEYED_LOAD_IC ||
          kind() == STORE_IC ||
          kind() == KEYED_STORE_IC ||
          kind() == TO_BOOLEAN_IC);
   ASSERT(0 <= major && major < 256);
   int previous = READ_UINT32_FIELD(this, kKindSpecificFlags2Offset);
   int updated = StubMajorKeyField::update(previous, major);
   WRITE_UINT32_FIELD(this, kKindSpecificFlags2Offset, updated);
 }
@@ skipping 196 matching lines @@
 
 
 void Code::set_to_boolean_state(byte value) {
   ASSERT(is_to_boolean_ic_stub());
   int previous = READ_UINT32_FIELD(this, kKindSpecificFlags1Offset);
   int updated = ToBooleanStateField::update(previous, value);
   WRITE_UINT32_FIELD(this, kKindSpecificFlags1Offset, updated);
 }
 
 
+byte Code::compare_nil_state() {
+  ASSERT(is_compare_nil_ic_stub());
+  return extra_ic_state();
+}
+
+
 bool Code::has_function_cache() {
   ASSERT(kind() == STUB);
   return HasFunctionCacheField::decode(
       READ_UINT32_FIELD(this, kKindSpecificFlags1Offset));
 }
 
 
 void Code::set_has_function_cache(bool flag) {
   ASSERT(kind() == STUB);
   int previous = READ_UINT32_FIELD(this, kKindSpecificFlags1Offset);
@@ skipping 1212 matching lines @@
 
 void Code::set_type_feedback_info(Object* value, WriteBarrierMode mode) {
   ASSERT(kind() == FUNCTION);
   WRITE_FIELD(this, kTypeFeedbackInfoOffset, value);
   CONDITIONAL_WRITE_BARRIER(GetHeap(), this, kTypeFeedbackInfoOffset,
                             value, mode);
 }
 
 
 int Code::stub_info() {
-  ASSERT(kind() == COMPARE_IC || kind() == BINARY_OP_IC || kind() == LOAD_IC);
+  ASSERT(kind() == COMPARE_IC || kind() == COMPARE_NIL_IC ||
+         kind() == BINARY_OP_IC || kind() == LOAD_IC);
   Object* value = READ_FIELD(this, kTypeFeedbackInfoOffset);
   return Smi::cast(value)->value();
 }
 
 
 void Code::set_stub_info(int value) {
   ASSERT(kind() == COMPARE_IC ||
+         kind() == COMPARE_NIL_IC ||
          kind() == BINARY_OP_IC ||
          kind() == STUB ||
          kind() == LOAD_IC ||
          kind() == KEYED_LOAD_IC ||
          kind() == STORE_IC ||
          kind() == KEYED_STORE_IC);
   WRITE_FIELD(this, kTypeFeedbackInfoOffset, Smi::FromInt(value));
 }
 
 
@@ skipping 974 matching lines @@
 #undef WRITE_UINT32_FIELD
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_