Add basic support for Latin1 to the API.

src/heap-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 65 matching lines @@
 
 
 void PromotionQueue::ActivateGuardIfOnTheSamePage() {
   guard_ = guard_ ||
       heap_->new_space()->active_space()->current_page()->address() ==
       GetHeadPage()->address();
 }
 
 
 MaybeObject* Heap::AllocateStringFromUtf8(Vector<const char> str,
-                                          PretenureFlag pretenure) {
-  // Check for ASCII first since this is the common case.
-  if (String::IsAscii(str.start(), str.length())) {
+                                          PretenureFlag pretenure,
+                                          String::AsciiHint ascii_hint) {
+  if ((ascii_hint == String::MAYBE_ASCII &&
+       String::IsAscii(str.start(), str.length())) ||
+      ascii_hint == String::STRICT_ASCII) {
+    // Assert that the strict ascii hint is correct.

[Erik Corry, 2012/08/21 12:21:34]

ascii -> ASCII
here and below

[Yang, 2012/08/21 13:06:20]

Done.

+    ASSERT(ascii_hint != String::STRICT_ASCII ||
+           String::IsAscii(str.start(), str.length()));
     // If the string is ASCII, we do not need to convert the characters
     // since UTF8 is backwards compatible with ASCII.
     return AllocateStringFromAscii(str, pretenure);
   }
   // Non-ASCII and we need to decode.
   return AllocateStringFromUtf8Slow(str, pretenure);
 }
 
 
+MaybeObject* Heap::AllocateStringFromLatin1(Vector<const char> str,
+                                            PretenureFlag pretenure,
+                                            String::AsciiHint ascii_hint) {
+  if ((ascii_hint == String::MAYBE_ASCII &&
+        String::IsAscii(str.start(), str.length())) ||
+       ascii_hint == String::STRICT_ASCII) {
+     // Assert that the strict ascii hint is correct.
+     ASSERT(ascii_hint != String::STRICT_ASCII ||
+            String::IsAscii(str.start(), str.length()));
+     // If the string is ASCII, we do not need to convert the characters
+     // since Latin1 is backwards compatible with ASCII.
+     return AllocateStringFromAscii(str, pretenure);
+  }
+  // Non-ASCII and we need to decode.
+  return AllocateStringFromLatin1Slow(str, pretenure);
+}
+
+
 MaybeObject* Heap::AllocateSymbol(Vector<const char> str,
                                   int chars,
                                   uint32_t hash_field) {
   unibrow::Utf8InputBuffer<> buffer(str.start(),
                                     static_cast<unsigned>(str.length()));
   return AllocateInternalSymbol(&buffer, chars, hash_field);
 }
 
 
 MaybeObject* Heap::AllocateAsciiSymbol(Vector<const char> str,
@@ skipping 711 matching lines @@
 AssertNoAllocation::~AssertNoAllocation() { }
 DisableAssertNoAllocation::DisableAssertNoAllocation() { }
 DisableAssertNoAllocation::~DisableAssertNoAllocation() { }
 
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HEAP_INL_H_