Verify that source string matches serialized code.

src/objects-inl.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // Review notes:
 //
 // - The use of macros in these inline functions may seem superfluous
 // but it is absolutely needed to make sure gcc generates optimal
 // code. gcc is not happy when attempting to inline too deep.
 //
@@ skipping 6544 matching lines @@
 template <typename schar>
 uint32_t StringHasher::HashSequentialString(const schar* chars,
                                             int length,
                                             uint32_t seed) {
   StringHasher hasher(length, seed);
   if (!hasher.has_trivial_hash()) hasher.AddCharacters(chars, length);
   return hasher.GetHashField();
 }
 
 
+uint32_t IteratingStringHasher::Hash(String* string, uint32_t seed) {
+  IteratingStringHasher hasher(string->length(), seed);
+  // Nothing to do.
+  if (hasher.has_trivial_hash()) return hasher.GetHashField();
+  ConsString* cons_string = String::VisitFlat(&hasher, string);
+  // The string was flat.
+  if (cons_string == NULL) return hasher.GetHashField();
+  // This is a ConsString, iterate across it.
+  ConsStringIteratorOp op(cons_string);
+  int offset;
+  while (NULL != (string = op.Next(&offset))) {
+    String::VisitFlat(&hasher, string, offset);
+  }
+  return hasher.GetHashField();
+}
+
+
+void IteratingStringHasher::VisitOneByteString(const uint8_t* chars,
+                                               int length) {
+  AddCharacters(chars, length);
+}
+
+
+void IteratingStringHasher::VisitTwoByteString(const uint16_t* chars,
+                                               int length) {
+  AddCharacters(chars, length);
+}
+
+
 bool Name::AsArrayIndex(uint32_t* index) {
   return IsString() && String::cast(this)->AsArrayIndex(index);
 }
 
 
 bool String::AsArrayIndex(uint32_t* index) {
   uint32_t field = hash_field();
   if (IsHashFieldComputed(field) && (field & kIsNotArrayIndexMask)) {
     return false;
   }
@@ skipping 594 matching lines @@
 #undef READ_SHORT_FIELD
 #undef WRITE_SHORT_FIELD
 #undef READ_BYTE_FIELD
 #undef WRITE_BYTE_FIELD
 #undef NOBARRIER_READ_BYTE_FIELD
 #undef NOBARRIER_WRITE_BYTE_FIELD
 
 } }  // namespace v8::internal
 
 #endif  // V8_OBJECTS_INL_H_