Calculate string hash during flattening.

src/heap.cc

 // Copyright 2006-2008 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 2233 matching lines @@
   Object* symbol = NULL;
   Object* new_table =
       SymbolTable::cast(symbol_table_)->LookupString(string, &symbol);
   if (new_table->IsFailure()) return new_table;
   symbol_table_ = new_table;
   ASSERT(symbol != NULL);
   return symbol;
 }
 
 
+bool Heap::LookupSymbolIfExists(String* string, String** symbol) {
+  if (string->IsSymbol()) {
+    *symbol = string;
+    return true;
+  }
+  SymbolTable* table = SymbolTable::cast(symbol_table_);
+  return table->LookupSymbolIfExists(string, symbol);
+}
+
+
 #ifdef DEBUG
 void Heap::ZapFromSpace() {
   ASSERT(HAS_HEAP_OBJECT_TAG(kFromSpaceZapValue));
   for (Address a = new_space_->FromSpaceLow();
        a < new_space_->FromSpaceHigh();
        a += kPointerSize) {
     Memory::Address_at(a) = kFromSpaceZapValue;
   }
 }
 #endif  // DEBUG
@@ skipping 771 matching lines @@
       return "Scavenge";
     case MARK_COMPACTOR:
       return MarkCompactCollector::HasCompacted() ? "Mark-compact"
                                                   : "Mark-sweep";
   }
   return "Unknown GC";
 }
 
 
 } }  // namespace v8::internal