Ensure integrity of ASCII strings.

src/objects-debug.cc

 // 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 440 matching lines @@
 void String::StringVerify() {
   CHECK(IsString());
   CHECK(length() >= 0 && length() <= Smi::kMaxValue);
   if (IsSymbol()) {
     CHECK(!HEAP->InNewSpace(this));
   }
   if (IsConsString()) {
     ConsString::cast(this)->ConsStringVerify();
   } else if (IsSlicedString()) {
     SlicedString::cast(this)->SlicedStringVerify();
+  } else if (IsSeqAsciiString()) {
+    SeqAsciiString::cast(this)->SeqAsciiStringVerify();
   }
 }
 
 
+void SeqAsciiString::SeqAsciiStringVerify() {
+  CHECK(String::IsAscii(GetChars(), length()));
+}
+
+
 void ConsString::ConsStringVerify() {
   CHECK(this->first()->IsString());
   CHECK(this->second() == GetHeap()->empty_string() ||
         this->second()->IsString());
   CHECK(this->length() >= ConsString::kMinLength);
   if (this->IsFlat()) {
     // A flat cons can only be created by String::SlowTryFlatten.
     // Afterwards, the first part may be externalized.
     CHECK(this->first()->IsSeqString() || this->first()->IsExternalString());
   }
@@ skipping 535 matching lines @@
   FixedArray* proto_transitions = prototype_transitions();
   MemsetPointer(proto_transitions->data_start(),
                 GetHeap()->the_hole_value(),
                 proto_transitions->length());
 }
 
 
 #endif  // DEBUG
 
 } }  // namespace v8::internal