208   // Accessing spaces
 209   ContiguousSpace* eden() const           { return _eden_space; }
 210   ContiguousSpace* from() const           { return _from_space; }
 211   ContiguousSpace* to()   const           { return _to_space;   }
 212 
 213   virtual CompactibleSpace* first_compaction_space() const;
 214 
 215   // Space enquiries
 216   size_t capacity() const;
 217   size_t used() const;
 218   size_t free() const;
 219   size_t max_capacity() const;
 220   size_t capacity_before_gc() const;
 221   size_t unsafe_max_alloc_nogc() const;
 222   size_t contiguous_available() const;
 223 
 224   size_t max_eden_size() const              { return _max_eden_size; }
 225   size_t max_survivor_size() const          { return _max_survivor_size; }
 226 
 227   bool supports_inline_contig_alloc() const { return true; }
 228   HeapWord** top_addr() const;
 229   HeapWord** end_addr() const;
 230 
 231   // Thread-local allocation buffers
 232   bool supports_tlab_allocation() const { return true; }
 233   size_t tlab_capacity() const;
 234   size_t tlab_used() const;
 235   size_t unsafe_max_tlab_alloc() const;
 236 
 237   // Grow the generation by the specified number of bytes.
 238   // The size of bytes is assumed to be properly aligned.
 239   // Return true if the expansion was successful.
 240   bool expand(size_t bytes);
 241 
 242   // DefNewGeneration cannot currently expand except at
 243   // a GC.
 244   virtual bool is_maximal_no_gc() const { return true; }
 245 
 246   // Iteration
 247   void object_iterate(ObjectClosure* blk);
 248 

 208   // Accessing spaces
 209   ContiguousSpace* eden() const           { return _eden_space; }
 210   ContiguousSpace* from() const           { return _from_space; }
 211   ContiguousSpace* to()   const           { return _to_space;   }
 212 
 213   virtual CompactibleSpace* first_compaction_space() const;
 214 
 215   // Space enquiries
 216   size_t capacity() const;
 217   size_t used() const;
 218   size_t free() const;
 219   size_t max_capacity() const;
 220   size_t capacity_before_gc() const;
 221   size_t unsafe_max_alloc_nogc() const;
 222   size_t contiguous_available() const;
 223 
 224   size_t max_eden_size() const              { return _max_eden_size; }
 225   size_t max_survivor_size() const          { return _max_survivor_size; }
 226 
 227   bool supports_inline_contig_alloc() const { return true; }
 228   HeapWord* volatile* top_addr() const;
 229   HeapWord** end_addr() const;
 230 
 231   // Thread-local allocation buffers
 232   bool supports_tlab_allocation() const { return true; }
 233   size_t tlab_capacity() const;
 234   size_t tlab_used() const;
 235   size_t unsafe_max_tlab_alloc() const;
 236 
 237   // Grow the generation by the specified number of bytes.
 238   // The size of bytes is assumed to be properly aligned.
 239   // Return true if the expansion was successful.
 240   bool expand(size_t bytes);
 241 
 242   // DefNewGeneration cannot currently expand except at
 243   // a GC.
 244   virtual bool is_maximal_no_gc() const { return true; }
 245 
 246   // Iteration
 247   void object_iterate(ObjectClosure* blk);
 248