- Create frame work for adding read only handles for symbols in the VM isolate

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/isolate.h"
 #include "vm/object.h"
 #include "vm/object_store.h"
 #include "vm/raw_object.h"
 #include "vm/snapshot_ids.h"
 #include "vm/unicode.h"
 #include "vm/visitor.h"
 
 namespace dart {
 
 RawString* Symbols::predefined_[Symbols::kMaxId];
+VMHandles Symbols::predefined_handles_;
+
+#define DEFINE_SYMBOL_HANDLE(symbol)                                           \
+  String* Symbols::symbol##_handle_ = NULL;
+PREDEFINED_SYMBOL_HANDLES_LIST(DEFINE_SYMBOL_HANDLE)
+#undef DEFINE_SYMBOL_HANDLE
 
 static const char* names[] = {
   NULL,
 
 #define DEFINE_SYMBOL_LITERAL(symbol, literal)                                 \
   literal,
 PREDEFINED_SYMBOLS_LIST(DEFINE_SYMBOL_LITERAL)
 #undef DEFINE_SYMBOL_LITERAL
 };
 
@@ skipping 24 matching lines @@
     str = OneByteString::New(names[i], Heap::kOld);
     Add(symbol_table, str);
     predefined_[i] = str.raw();
   }
   Object::RegisterSingletonClassNames();
 
   for (int32_t c = 0; c <= kMaxOneCharCodeSymbol; c++) {
     ASSERT(kMaxPredefinedId + c < kMaxId);
     predefined_[kMaxPredefinedId + c] = FromUTF32(&c, 1);
   }
+
+#define INITIALIZE_SYMBOL_HANDLE(symbol)                                       \
+  symbol##_handle_ = reinterpret_cast<String*>(                                \
+      predefined_handles_.AllocateScopedHandle());                             \
+  *symbol##_handle_ = symbol();
+PREDEFINED_SYMBOL_HANDLES_LIST(INITIALIZE_SYMBOL_HANDLE)
+#undef INITIALIZE_SYMBOL_HANDLE
 }
 
 
 void Symbols::SetupSymbolTable(Isolate* isolate) {
   ASSERT(isolate != NULL);
 
   // Setup the symbol table used within the String class.
   const int initial_size = (isolate == Dart::vm_isolate()) ?
       kInitialVMIsolateSymtabSize : kInitialSymtabSize;
   const Array& array = Array::Handle(Array::New(initial_size + 1));
@@ skipping 287 matching lines @@
 }
 
 
 RawObject* Symbols::GetVMSymbol(intptr_t object_id) {
   ASSERT(IsVMSymbolId(object_id));
   intptr_t i = (object_id - kMaxPredefinedObjectIds);
   return (i > 0 && i < Symbols::kMaxId) ? predefined_[i] : Object::null();
 }
 
 }  // namespace dart