Symbols::NewFormatted and old space allocation.

runtime/vm/symbols.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/symbols.h"
 
 #include "vm/handles.h"
 #include "vm/handles_impl.h"
 #include "vm/hash_table.h"
 #include "vm/isolate.h"
@@ skipping 522 matching lines @@
   }
   return New(str, 0, str.Length());
 }
 
 
 RawString* Symbols::New(const String& str, intptr_t begin_index, intptr_t len) {
   return NewSymbol(StringSlice(str, begin_index, len));
 }
 
 
+
+RawString* Symbols::NewFormatted(const char* format, ...) {
+  va_list args;
+  va_start(args, format);
+  RawString* result = NewFormattedV(format, args);
+  NoSafepointScope no_safepoint;
+  va_end(args);
+  return result;
+}
+
+
+RawString* Symbols::NewFormattedV(const char* format, va_list args) {
+  va_list args_copy;
+  va_copy(args_copy, args);
+  intptr_t len = OS::VSNPrint(NULL, 0, format, args_copy);
+  va_end(args_copy);
+
+  Zone* zone = Thread::Current()->zone();
+  char* buffer = zone->Alloc<char>(len + 1);
+  OS::VSNPrint(buffer, (len + 1), format, args);
+
+  return Symbols::New(buffer);
+}
+
+
 RawString* Symbols::FromCharCode(int32_t char_code) {
   if (char_code > kMaxOneCharCodeSymbol) {
     return FromUTF32(&char_code, 1);
   }
   return predefined_[char_code];
 }
 
 
 void Symbols::DumpStats() {
   if (FLAG_dump_symbol_stats) {
@@ skipping 26 matching lines @@
 RawObject* Symbols::GetVMSymbol(intptr_t object_id) {
   ASSERT(IsVMSymbolId(object_id));
   intptr_t i = (object_id - kMaxPredefinedObjectIds);
   if ((i > kIllegal) && (i < Symbols::kMaxPredefinedId)) {
     return symbol_handles_[i]->raw();
   }
   return Object::null();
 }
 
 }  // namespace dart