CONVERT_CHECKED(String, x, args[0]);
CONVERT_CHECKED(String, y, args[1]);
- // This is very similar to String::Equals(String*) but that version
- // requires flattened strings as input, whereas we flatten the
- // strings only if the fast cases fail. Note that this may fail,
- // requiring a GC. String::Equals(String*) returns a bool and has
- // no way to signal a failure.
- if (y == x) return Smi::FromInt(EQUAL);
- if (x->IsSymbol() && y->IsSymbol()) return Smi::FromInt(NOT_EQUAL);
- // Compare contents
- int len = x->length();
- if (len != y->length()) return Smi::FromInt(NOT_EQUAL);
- if (len == 0) return Smi::FromInt(EQUAL);
-
- // Handle one elment strings.
- if (x->Get(0) != y->Get(0)) return Smi::FromInt(NOT_EQUAL);
- if (len == 1) return Smi::FromInt(EQUAL);
-
- // Fast case: First, middle and last characters.
- if (x->Get(len>>1) != y->Get(len>>1)) return Smi::FromInt(NOT_EQUAL);
- if (x->Get(len - 1) != y->Get(len - 1)) return Smi::FromInt(NOT_EQUAL);
-
- x->TryFlatten();
- y->TryFlatten();
-
- static StringInputBuffer buf1;
- static StringInputBuffer buf2;
- buf1.Reset(x);
- buf2.Reset(y);
- while (buf1.has_more()) {
- if (buf1.GetNext() != buf2.GetNext())
- return Smi::FromInt(NOT_EQUAL);
- }
- return Smi::FromInt(EQUAL);
+ bool not_equal = !x->Equals(y);
+ // This is slightly convoluted because the value that signifies
+ // equality is 0 and inequality is 1 so we have to negate the result
+ // from String::Equals.
+ ASSERT(not_equal == 0 || not_equal == 1);
+ STATIC_CHECK(EQUAL == 0);
+ STATIC_CHECK(NOT_EQUAL == 1);
+ return Smi::FromInt(not_equal);
}