Introduce new API to expose external string resource regardless of encoding.

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 364 matching lines @@
 
 
 uint32_t StringShape::full_representation_tag() {
   return (type_ & (kStringRepresentationMask | kStringEncodingMask));
 }
 
 
 STATIC_CHECK((kStringRepresentationMask | kStringEncodingMask) ==
              Internals::kFullStringRepresentationMask);
 
+STATIC_CHECK(static_cast<uint32_t>(kStringEncodingMask) ==
+             Internals::kStringEncodingMask);
+
 
 bool StringShape::IsSequentialAscii() {
   return full_representation_tag() == (kSeqStringTag | kAsciiStringTag);
 }
 
 
 bool StringShape::IsSequentialTwoByte() {
   return full_representation_tag() == (kSeqStringTag | kTwoByteStringTag);
 }
 
 
 bool StringShape::IsExternalAscii() {
   return full_representation_tag() == (kExternalStringTag | kAsciiStringTag);
 }
 
 
+STATIC_CHECK((kExternalStringTag | kAsciiStringTag) ==
+             Internals::kExternalAsciiRepresentationTag);
+
+STATIC_CHECK(v8::String::ASCII_ENCODING == kAsciiStringTag);
+
+
 bool StringShape::IsExternalTwoByte() {
   return full_representation_tag() == (kExternalStringTag | kTwoByteStringTag);
 }
 
 
 STATIC_CHECK((kExternalStringTag | kTwoByteStringTag) ==
              Internals::kExternalTwoByteRepresentationTag);
 
+STATIC_CHECK(v8::String::TWO_BYTE_ENCODING == kTwoByteStringTag);
 
 uc32 FlatStringReader::Get(int index) {
   ASSERT(0 <= index && index <= length_);
   if (is_ascii_) {
     return static_cast<const byte*>(start_)[index];
   } else {
     return static_cast<const uc16*>(start_)[index];
   }
 }
 
@@ skipping 5007 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_