Version 3.7.9.

src/objects-inl.h

Index: src/objects-inl.h
===================================================================
--- src/objects-inl.h	(revision 10035)
+++ src/objects-inl.h	(working copy)
@@ -2297,6 +2297,11 @@
 }
 
 
+void ExternalString::clear_data_cache() {
+  WRITE_INTPTR_FIELD(this, kResourceDataOffset, 0);
+}
+
+
 const ExternalAsciiString::Resource* ExternalAsciiString::resource() {
   return *reinterpret_cast<Resource**>(FIELD_ADDR(this, kResourceOffset));
 }
@@ -2306,9 +2311,24 @@
     const ExternalAsciiString::Resource* resource) {
   *reinterpret_cast<const Resource**>(
       FIELD_ADDR(this, kResourceOffset)) = resource;
+  clear_data_cache();
 }
 
 
+const char* ExternalAsciiString::GetChars() {
+  const char** data_field =
+      reinterpret_cast<const char**>(FIELD_ADDR(this, kResourceDataOffset));
+  if (*data_field == NULL) *data_field = resource()->data();
+  return *data_field;
+}
+
+
+uint16_t ExternalAsciiString::ExternalAsciiStringGet(int index) {
+  ASSERT(index >= 0 && index < length());
+  return GetChars()[index];
+}
+
+
 const ExternalTwoByteString::Resource* ExternalTwoByteString::resource() {
   return *reinterpret_cast<Resource**>(FIELD_ADDR(this, kResourceOffset));
 }
@@ -2318,9 +2338,30 @@
     const ExternalTwoByteString::Resource* resource) {
   *reinterpret_cast<const Resource**>(
       FIELD_ADDR(this, kResourceOffset)) = resource;
+  clear_data_cache();
 }
 
 
+const uint16_t* ExternalTwoByteString::GetChars() {
+  const uint16_t** data_field =
+      reinterpret_cast<const uint16_t**>(FIELD_ADDR(this, kResourceDataOffset));
+  if (*data_field == NULL) *data_field = resource()->data();
+  return *data_field;
+}
+
+
+uint16_t ExternalTwoByteString::ExternalTwoByteStringGet(int index) {
+  ASSERT(index >= 0 && index < length());
+  return GetChars()[index];
+}
+
+
+const uint16_t* ExternalTwoByteString::ExternalTwoByteStringGetData(
+      unsigned start) {
+  return GetChars() + start;
+}
+
+
 void JSFunctionResultCache::MakeZeroSize() {
   set_finger_index(kEntriesIndex);
   set_size(kEntriesIndex);