Add basic support for Latin1 strings to the API.

src/api.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 3839 matching lines @@
   if (IsDeadCheck(isolate, "v8::String::WriteUtf8()")) return 0;
   LOG_API(isolate, "String::WriteUtf8");
   ENTER_V8(isolate);
   i::Handle<i::String> str = Utils::OpenHandle(this);
   if (options & HINT_MANY_WRITES_EXPECTED) {
     FlattenString(str);  // Flatten the string for efficiency.
   }
   int string_length = str->length();
   if (str->IsAsciiRepresentation()) {
     int len;
-    if (capacity == -1) {
+    if (capacity == kUndefinedLength) {
       capacity = str->length() + 1;
       len = string_length;
     } else {
       len = i::Min(capacity, str->length());
     }
     i::String::WriteToFlat(*str, buffer, 0, len);
     if (nchars_ref != NULL) *nchars_ref = len;
     if (!(options & NO_NULL_TERMINATION) && capacity > len) {
       buffer[len] = '\0';
       return len + 1;
     }
     return len;
   }
 
-  if (capacity == -1 || capacity / 3 >= string_length) {
+  if (capacity == kUndefinedLength || capacity / 3 >= string_length) {
     int32_t previous = unibrow::Utf16::kNoPreviousCharacter;
     const int kMaxRecursion = 100;
     int utf8_bytes =
         RecursivelySerializeToUtf8(*str,
                                    buffer,
                                    0,
                                    string_length,
                                    kMaxRecursion,
                                    previous,
                                    &previous);
@@ skipping 10 matching lines @@
     // Recurse once.  This time around the string is flat and the serializing
     // with recursion will certainly succeed.
     return WriteUtf8(buffer, capacity, nchars_ref, options);
   } else if (capacity >= string_length) {
     // First check that the buffer is large enough.  If it is, then recurse
     // once without a capacity limit, which will get into the other branch of
     // this 'if'.
     int utf8_bytes = i::Utf8Length(str);
     if ((options & NO_NULL_TERMINATION) == 0) utf8_bytes++;
     if (utf8_bytes <= capacity) {
-      return WriteUtf8(buffer, -1, nchars_ref, options);
+      return WriteUtf8(buffer, kUndefinedLength, nchars_ref, options);
     }
   }
 
   // Slow case.
   i::StringInputBuffer& write_input_buffer = *isolate->write_input_buffer();
   isolate->string_tracker()->RecordWrite(str);
 
   write_input_buffer.Reset(0, *str);
   int len = str->length();
   // Encode the first K - 3 bytes directly into the buffer since we
   // know there's room for them.  If no capacity is given we copy all
   // of them here.
   int fast_end = capacity - (unibrow::Utf8::kMaxEncodedSize - 1);
   int i;
   int pos = 0;
   int nchars = 0;
   int previous = unibrow::Utf16::kNoPreviousCharacter;
-  for (i = 0; i < len && (capacity == -1 || pos < fast_end); i++) {
+  for (i = 0;
+       i < len && (capacity == kUndefinedLength || pos < fast_end);
+       i++) {
     i::uc32 c = write_input_buffer.GetNext();
     int written = unibrow::Utf8::Encode(buffer + pos, c, previous);
     pos += written;
     nchars++;
     previous = c;
   }
   if (i < len) {
     // For the last characters we need to check the length for each one
     // because they may be longer than the remaining space in the
     // buffer.
@@ skipping 25 matching lines @@
         } else {
           // We've reached the end of the buffer
           break;
         }
       }
       previous = c;
     }
   }
   if (nchars_ref != NULL) *nchars_ref = nchars;
   if (!(options & NO_NULL_TERMINATION) &&
-      (i == len && (capacity == -1 || pos < capacity))) {
+      (i == len && (capacity == kUndefinedLength || pos < capacity))) {
     buffer[pos++] = '\0';
   }
   return pos;
 }
 
 
 int String::WriteAscii(char* buffer,
                        int start,
                        int length,
                        int options) const {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::String::WriteAscii()")) return 0;
   LOG_API(isolate, "String::WriteAscii");
   ENTER_V8(isolate);
-  ASSERT(start >= 0 && length >= -1);
+  ASSERT(start >= 0 && length >= kUndefinedLength);
   i::Handle<i::String> str = Utils::OpenHandle(this);
   isolate->string_tracker()->RecordWrite(str);
   if (options & HINT_MANY_WRITES_EXPECTED) {
     FlattenString(str);  // Flatten the string for efficiency.
   }
 
   if (str->IsAsciiRepresentation()) {
     // WriteToFlat is faster than using the StringInputBuffer.
-    if (length == -1) length = str->length() + 1;
+    if (length == kUndefinedLength) length = str->length() + 1;
     int len = i::Min(length, str->length() - start);
     i::String::WriteToFlat(*str, buffer, start, start + len);
     if (!(options & PRESERVE_ASCII_NULL)) {
       for (int i = 0; i < len; i++) {
         if (buffer[i] == '\0') buffer[i] = ' ';
       }
     }
     if (!(options & NO_NULL_TERMINATION) && length > len) {
       buffer[len] = '\0';
     }
     return len;
   }
 
   i::StringInputBuffer& write_input_buffer = *isolate->write_input_buffer();
   int end = length;
-  if ((length == -1) || (length > str->length() - start)) {
+  if ((length == kUndefinedLength) || (length > str->length() - start)) {
     end = str->length() - start;
   }
   if (end < 0) return 0;
   write_input_buffer.Reset(start, *str);
   int i;
   for (i = 0; i < end; i++) {
     char c = static_cast<char>(write_input_buffer.GetNext());
     if (c == '\0' && !(options & PRESERVE_ASCII_NULL)) c = ' ';
     buffer[i] = c;
   }
   if (!(options & NO_NULL_TERMINATION) && (length == -1 || i < length)) {
     buffer[i] = '\0';
   }
   return i;
 }
 
 
+int String::WriteLatin1(char* buffer,
+                        int start,
+                        int length,
+                        int options) const {
+  i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
+  if (IsDeadCheck(isolate, "v8::String::WriteLatin1()")) return 0;
+  LOG_API(isolate, "String::WriteLatin1");
+  ENTER_V8(isolate);
+  ASSERT(start >= 0 && length >= kUndefinedLength);
+  i::Handle<i::String> str = Utils::OpenHandle(this);
+  isolate->string_tracker()->RecordWrite(str);
+  if (options & HINT_MANY_WRITES_EXPECTED) {
+    FlattenString(str);  // Flatten the string for efficiency.
+  }
+
+  if (length == kUndefinedLength) length = str->length() + 1;
+  int len = i::Min(length, str->length() - start);
+  i::String::WriteToFlat(*str, buffer, start, start + len);
+  if (!(options & NO_NULL_TERMINATION) && length > len) {
+    buffer[len] = '\0';
+  }
+  return len;
+}
+
+
 int String::Write(uint16_t* buffer,
                   int start,
                   int length,
                   int options) const {
   i::Isolate* isolate = Utils::OpenHandle(this)->GetIsolate();
   if (IsDeadCheck(isolate, "v8::String::Write()")) return 0;
   LOG_API(isolate, "String::Write");
   ENTER_V8(isolate);
-  ASSERT(start >= 0 && length >= -1);
+  ASSERT(start >= 0 && length >= kUndefinedLength);
   i::Handle<i::String> str = Utils::OpenHandle(this);
   isolate->string_tracker()->RecordWrite(str);
   if (options & HINT_MANY_WRITES_EXPECTED) {
     // Flatten the string for efficiency.  This applies whether we are
     // using StringInputBuffer or Get(i) to access the characters.
     FlattenString(str);
   }
   int end = start + length;
-  if ((length == -1) || (length > str->length() - start) )
+  if ((length == kUndefinedLength) || (length > str->length() - start) )
     end = str->length();
   if (end < 0) return 0;
   i::String::WriteToFlat(*str, buffer, start, end);
   if (!(options & NO_NULL_TERMINATION) &&
       (length == -1 || end - start < length)) {
     buffer[end - start] = '\0';
   }
   return end - start;
 }
 
@@ skipping 10 matching lines @@
 
 bool v8::String::IsExternalAscii() const {
   i::Handle<i::String> str = Utils::OpenHandle(this);
   if (IsDeadCheck(str->GetIsolate(), "v8::String::IsExternalAscii()")) {
     return false;
   }
   return i::StringShape(*str).IsExternalAscii();
 }
 
 
-void v8::String::VerifyExternalStringResource(
-    v8::String::ExternalStringResource* value) const {
+void v8::String::VerifyExternalStringEncoding(int encoding) const {
+  typedef internal::Internals I;
   i::Handle<i::String> str = Utils::OpenHandle(this);
-  const v8::String::ExternalStringResource* expected;
-  if (i::StringShape(*str).IsExternalTwoByte()) {
-    const void* resource =
-        i::Handle<i::ExternalTwoByteString>::cast(str)->resource();
-    expected = reinterpret_cast<const ExternalStringResource*>(resource);
-  } else {
-    expected = NULL;
+  switch (encoding) {
+    case UTF16_ENCODING | STRICT_ASCII_HINT:
+      CHECK(str->HasOnlyAsciiChars());
+      // Fall through
+    case UTF16_ENCODING | NOT_ASCII_HINT :
+      CHECK(str->IsExternalTwoByteString());
+      break;
+    case LATIN1_ENCODING | STRICT_ASCII_HINT:
+    CHECK(str->IsExternalAsciiString());
+      break;
+    default:
+      CHECK_EQ(INVALID_ENCODING, encoding);
+      CHECK(!str->IsExternalString());
+      break;
   }
-  CHECK_EQ(expected, value);
 }
 
 
+void v8::String::VerifyExternalStringResourceBase(
+    v8::String::ExternalStringResourceBase* value) const {
+  i::Handle<i::String> str = Utils::OpenHandle(this);
+  i::StringShape shape(*str);
+  const void* expected;
+  // We expect an external string at this point since GetExternalStringEncoding
+  // should have already been called to rule out non-external strings.
+  if (i::StringShape(*str).IsExternalTwoByte()) {
+    expected = i::ExternalTwoByteString::cast(*str)->resource();
+  } else {
+    ASSERT(i::StringShape(*str).IsExternalAscii());
+    expected = i::ExternalAsciiString::cast(*str)->resource();
+  }
+
+  CHECK_EQ(expected,
+           reinterpret_cast<const ExternalStringResourceBase*>(value));
+}
+
+
 const v8::String::ExternalAsciiStringResource*
       v8::String::GetExternalAsciiStringResource() const {
   i::Handle<i::String> str = Utils::OpenHandle(this);
   if (IsDeadCheck(str->GetIsolate(),
                   "v8::String::GetExternalAsciiStringResource()")) {
     return NULL;
   }
   if (i::StringShape(*str).IsExternalAscii()) {
     const void* resource =
         i::Handle<i::ExternalAsciiString>::cast(str)->resource();
@@ skipping 584 matching lines @@
 Local<String> v8::String::Empty() {
   i::Isolate* isolate = i::Isolate::Current();
   if (!EnsureInitializedForIsolate(isolate, "v8::String::Empty()")) {
     return v8::Local<String>();
   }
   LOG_API(isolate, "String::Empty()");
   return Utils::ToLocal(isolate->factory()->empty_symbol());
 }
 
 
-Local<String> v8::String::New(const char* data, int length) {
+static i::Handle<i::String> NewOneByteEncodedString(
+    i::Factory* factory, const char* data, int length, int encoding) {
+  if (length == String::kUndefinedLength) length = i::StrLength(data);
+  typedef v8::String S;
+
+  static const int kAsciiHintShift = 16;
+  ASSERT(IS_POWER_OF_TWO(encoding & S::kAsciiHintMask));
+  i::String::AsciiHint ascii_hint =
+      static_cast<i::String::AsciiHint>(encoding >> kAsciiHintShift);
+  STATIC_ASSERT(i::String::MAYBE_ASCII == 0);
+  STATIC_ASSERT(i::String::NOT_ASCII ==
+                (v8::String::NOT_ASCII_HINT >> kAsciiHintShift));
+  STATIC_ASSERT(i::String::STRICT_ASCII ==
+                (v8::String::STRICT_ASCII_HINT >> kAsciiHintShift));
+
+  int masked_encoding = encoding & S::kStringEncodingMask;
+
+  if (masked_encoding == S::UTF8_ENCODING) {
+    return factory->NewStringFromUtf8(
+               i::Vector<const char>(data, length), i::NOT_TENURED, ascii_hint);
+  } else if (masked_encoding == S::LATIN1_ENCODING) {
+    return factory->NewStringFromLatin1(
+               i::Vector<const char>(data, length), i::NOT_TENURED, ascii_hint);
+  } else {  // Wrong encoding.
+    return i::Handle<i::String>();
+  }
+}
+
+
+Local<String> v8::String::New(
+    const char* data, int length, int encoding) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::String::New()");
   LOG_API(isolate, "String::New(char)");
   if (length == 0) return Empty();
   ENTER_V8(isolate);
-  if (length == -1) length = i::StrLength(data);
-  i::Handle<i::String> result =
-      isolate->factory()->NewStringFromUtf8(
-          i::Vector<const char>(data, length));
-  return Utils::ToLocal(result);
+  return Utils::ToLocal(
+      NewOneByteEncodedString(isolate->factory(), data, length, encoding));
 }
 
 
 Local<String> v8::String::Concat(Handle<String> left, Handle<String> right) {
   i::Handle<i::String> left_string = Utils::OpenHandle(*left);
   i::Isolate* isolate = left_string->GetIsolate();
   EnsureInitializedForIsolate(isolate, "v8::String::New()");
   LOG_API(isolate, "String::New(char)");
   ENTER_V8(isolate);
   i::Handle<i::String> right_string = Utils::OpenHandle(*right);
   i::Handle<i::String> result = isolate->factory()->NewConsString(left_string,
                                                                   right_string);
   return Utils::ToLocal(result);
 }
 
 
-Local<String> v8::String::NewUndetectable(const char* data, int length) {
+Local<String> v8::String::NewUndetectable(
+    const char* data, int length, int encoding) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::String::NewUndetectable()");
   LOG_API(isolate, "String::NewUndetectable(char)");
   ENTER_V8(isolate);
-  if (length == -1) length = i::StrLength(data);
   i::Handle<i::String> result =
-      isolate->factory()->NewStringFromUtf8(
-          i::Vector<const char>(data, length));
+      NewOneByteEncodedString(isolate->factory(), data, length, encoding);
   result->MarkAsUndetectable();
   return Utils::ToLocal(result);
 }
 
 
 static int TwoByteStringLength(const uint16_t* data) {
   int length = 0;
   while (data[length] != '\0') length++;
   return length;
 }
 
 
 Local<String> v8::String::New(const uint16_t* data, int length) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::String::New()");
   LOG_API(isolate, "String::New(uint16_)");
   if (length == 0) return Empty();
   ENTER_V8(isolate);
-  if (length == -1) length = TwoByteStringLength(data);
+  if (length == kUndefinedLength) length = TwoByteStringLength(data);
   i::Handle<i::String> result =
       isolate->factory()->NewStringFromTwoByte(
           i::Vector<const uint16_t>(data, length));
+  if (result->IsAsciiRepresentation()) {
+    isolate->counters()->string_length_ascii()->Increment(length);
+  } else {
+    isolate->counters()->string_length_utf16()->Increment(length);
+  }
   return Utils::ToLocal(result);
 }
 
 
 Local<String> v8::String::NewUndetectable(const uint16_t* data, int length) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::String::NewUndetectable()");
   LOG_API(isolate, "String::NewUndetectable(uint16_)");
   ENTER_V8(isolate);
-  if (length == -1) length = TwoByteStringLength(data);
+  if (length == kUndefinedLength) length = TwoByteStringLength(data);
   i::Handle<i::String> result =
       isolate->factory()->NewStringFromTwoByte(
           i::Vector<const uint16_t>(data, length));
   result->MarkAsUndetectable();
   return Utils::ToLocal(result);
 }
 
 
 i::Handle<i::String> NewExternalStringHandle(i::Isolate* isolate,
       v8::String::ExternalStringResource* resource) {
@@ skipping 17 matching lines @@
   EnsureInitializedForIsolate(isolate, "v8::String::NewExternal()");
   LOG_API(isolate, "String::NewExternal");
   ENTER_V8(isolate);
   CHECK(resource && resource->data());
   i::Handle<i::String> result = NewExternalStringHandle(isolate, resource);
   isolate->heap()->external_string_table()->AddString(*result);
   return Utils::ToLocal(result);
 }
 
 
-bool v8::String::MakeExternal(v8::String::ExternalStringResource* resource) {
-  i::Handle<i::String> obj = Utils::OpenHandle(this);
-  i::Isolate* isolate = obj->GetIsolate();
+template<class StringResourceType>
+static bool MakeStringExternal(
+    i::Handle<i::String> string, StringResourceType* resource) {
+  i::Isolate* isolate = string->GetIsolate();
   if (IsDeadCheck(isolate, "v8::String::MakeExternal()")) return false;
-  if (i::StringShape(*obj).IsExternalTwoByte()) {
+  if (i::StringShape(*string).IsExternal()) {
     return false;  // Already an external string.
   }
   ENTER_V8(isolate);
-  if (isolate->string_tracker()->IsFreshUnusedString(obj)) {
+  if (isolate->string_tracker()->IsFreshUnusedString(string)) {
     return false;
   }
   if (isolate->heap()->IsInGCPostProcessing()) {
     return false;
   }
   CHECK(resource && resource->data());
-  bool result = obj->MakeExternal(resource);
-  if (result && !obj->IsSymbol()) {
-    isolate->heap()->external_string_table()->AddString(*obj);
+  bool result = string->MakeExternal(resource);
+  if (result && !string->IsSymbol()) {
+    isolate->heap()->external_string_table()->AddString(*string);
   }
   return result;
 }
 
 
+bool v8::String::MakeExternal(ExternalStringResource* resource) {
+  i::Handle<i::String> obj = Utils::OpenHandle(this);
+  return MakeStringExternal(obj, resource);
+}
+
+
+bool v8::String::MakeExternal(ExternalAsciiStringResource* resource) {
+  i::Handle<i::String> obj = Utils::OpenHandle(this);
+  ASSERT(obj->HasOnlyAsciiChars());
+  return MakeStringExternal(obj, resource);
+}
+
+
 Local<String> v8::String::NewExternal(
       v8::String::ExternalAsciiStringResource* resource) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::String::NewExternal()");
   LOG_API(isolate, "String::NewExternal");
   ENTER_V8(isolate);
   CHECK(resource && resource->data());
   i::Handle<i::String> result = NewExternalAsciiStringHandle(isolate, resource);
   isolate->heap()->external_string_table()->AddString(*result);
   return Utils::ToLocal(result);
 }
 
 
-bool v8::String::MakeExternal(
-    v8::String::ExternalAsciiStringResource* resource) {
-  i::Handle<i::String> obj = Utils::OpenHandle(this);
-  i::Isolate* isolate = obj->GetIsolate();
-  if (IsDeadCheck(isolate, "v8::String::MakeExternal()")) return false;
-  if (i::StringShape(*obj).IsExternalTwoByte()) {
-    return false;  // Already an external string.
+Local<String> v8::String::NewExternal(ExternalLatin1StringResource* resource,
+                                      int encoding) {
+  typedef v8::internal::Internals I;
+  i::Isolate* isolate = i::Isolate::Current();
+  EnsureInitializedForIsolate(isolate, "v8::String::NewExternal()");
+  LOG_API(isolate, "String::NewExternal");
+  ENTER_V8(isolate);
+  ASSERT((encoding & kStringEncodingMask) == LATIN1_ENCODING);
+  bool ascii_hint = (encoding & kAsciiHintMask);
+  i::Handle<i::String> result;
+
+  if (ascii_hint == STRICT_ASCII_HINT ||
+      (ascii_hint != NOT_ASCII_HINT &&
+      i::String::IsAscii(resource->data(), resource->length()))) {
+    // Assert that the ascii hint is correct.
+    ASSERT(ascii_hint != STRICT_ASCII_HINT ||
+           i::String::IsAscii(resource->data(), resource->length()));
+    result = NewExternalAsciiStringHandle(isolate, resource);
+    isolate->heap()->external_string_table()->AddString(*result);
+  } else {
+    // We cannot simply take the backing store and use it as an ASCII string,
+    // since it's not.  Instead, we convert it to an internal string and dispose
+    // the external resource.
+    result = isolate->factory()->NewStringFromLatin1(
+        i::Vector<const char>(resource->data(), resource->length()),
+        i::NOT_TENURED,
+        i::String::NOT_ASCII);
+    resource->Dispose();
   }
-  ENTER_V8(isolate);
-  if (isolate->string_tracker()->IsFreshUnusedString(obj)) {
-    return false;
-  }
-  if (isolate->heap()->IsInGCPostProcessing()) {
-    return false;
-  }
-  CHECK(resource && resource->data());
-  bool result = obj->MakeExternal(resource);
-  if (result && !obj->IsSymbol()) {
-    isolate->heap()->external_string_table()->AddString(*obj);
-  }
-  return result;
+  return Utils::ToLocal(result);
 }
 
 
 bool v8::String::CanMakeExternal() {
   if (!internal::FLAG_clever_optimizations) return false;
   i::Handle<i::String> obj = Utils::OpenHandle(this);
   i::Isolate* isolate = obj->GetIsolate();
   if (IsDeadCheck(isolate, "v8::String::CanMakeExternal()")) return false;
   if (isolate->string_tracker()->IsFreshUnusedString(obj)) return false;
   int size = obj->Size();  // Byte size of the original string.
@@ skipping 242 matching lines @@
   i::Handle<i::JSObject> paragon_handle(i::JSObject::cast(paragon));
   EXCEPTION_PREAMBLE(isolate);
   ENTER_V8(isolate);
   i::Handle<i::JSObject> result = i::Copy(paragon_handle);
   has_pending_exception = result.is_null();
   EXCEPTION_BAILOUT_CHECK(isolate, Local<Object>());
   return Utils::ToLocal(result);
 }
 
 
-Local<String> v8::String::NewSymbol(const char* data, int length) {
+Local<String> v8::String::NewSymbol(
+    const char* data, int length, int encoding) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::String::NewSymbol()");
   LOG_API(isolate, "String::NewSymbol(char)");
   ENTER_V8(isolate);
-  if (length == -1) length = i::StrLength(data);
-  i::Handle<i::String> result =
-      isolate->factory()->LookupSymbol(i::Vector<const char>(data, length));
+  if (length == kUndefinedLength) length = i::StrLength(data);
+  i::Handle<i::String> result;
+
+  ASSERT(IS_POWER_OF_TWO(encoding & kAsciiHintMask));
+  if (((encoding & kStringEncodingMask) == LATIN1_ENCODING) &&
+      ((encoding & kAsciiHintMask) == NOT_ASCII_HINT ||
+       !i::String::IsAscii(data, length))) {
+    result = isolate->factory()->NewStringFromLatin1(
+                 i::Vector<const char>(data, length),
+                 i::NOT_TENURED,
+                 i::String::NOT_ASCII);
+    result = isolate->factory()->LookupSymbol(result);
+  } else {  // We can handle UTF8 and ASCII strings here.
+    result =
+        isolate->factory()->LookupSymbol(i::Vector<const char>(data, length));
+  }
   return Utils::ToLocal(result);
 }
 
 
 Local<Number> v8::Number::New(double value) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::Number::New()");
   if (isnan(value)) {
     // Introduce only canonical NaN value into the VM, to avoid signaling NaNs.
     value = i::OS::nan_value();
@@ skipping 1389 matching lines @@
 
   v->VisitPointers(blocks_.first(), first_block_limit_);
 
   for (int i = 1; i < blocks_.length(); i++) {
     v->VisitPointers(blocks_[i], &blocks_[i][kHandleBlockSize]);
   }
 }
 
 
 } }  // namespace v8::internal