48 Generation::Generation(ReservedSpace rs, size_t initial_size, int level) :
  49   _level(level),
  50   _ref_processor(NULL) {
  51   if (!_virtual_space.initialize(rs, initial_size)) {
  52     vm_exit_during_initialization("Could not reserve enough space for "
  53                     "object heap");
  54   }
  55   // Mangle all of the the initial generation.
  56   if (ZapUnusedHeapArea) {
  57     MemRegion mangle_region((HeapWord*)_virtual_space.low(),
  58       (HeapWord*)_virtual_space.high());
  59     SpaceMangler::mangle_region(mangle_region);
  60   }
  61   _reserved = MemRegion((HeapWord*)_virtual_space.low_boundary(),
  62           (HeapWord*)_virtual_space.high_boundary());
  63 }
  64 
  65 GenerationSpec* Generation::spec() {
  66   GenCollectedHeap* gch = GenCollectedHeap::heap();
  67   assert(0 <= level() && level() < gch->_n_gens, "Bad gen level");
  68   return gch->_gen_specs[level()];
  69 }
  70 
  71 size_t Generation::max_capacity() const {
  72   return reserved().byte_size();
  73 }
  74 
  75 void Generation::print_heap_change(size_t prev_used) const {
  76   if (PrintGCDetails && Verbose) {
  77     gclog_or_tty->print(" "  SIZE_FORMAT
  78                         "->" SIZE_FORMAT
  79                         "("  SIZE_FORMAT ")",
  80                         prev_used, used(), capacity());
  81   } else {
  82     gclog_or_tty->print(" "  SIZE_FORMAT "K"
  83                         "->" SIZE_FORMAT "K"
  84                         "("  SIZE_FORMAT "K)",
  85                         prev_used / K, used() / K, capacity() / K);
  86   }
  87 }
  88 

  48 Generation::Generation(ReservedSpace rs, size_t initial_size, int level) :
  49   _level(level),
  50   _ref_processor(NULL) {
  51   if (!_virtual_space.initialize(rs, initial_size)) {
  52     vm_exit_during_initialization("Could not reserve enough space for "
  53                     "object heap");
  54   }
  55   // Mangle all of the the initial generation.
  56   if (ZapUnusedHeapArea) {
  57     MemRegion mangle_region((HeapWord*)_virtual_space.low(),
  58       (HeapWord*)_virtual_space.high());
  59     SpaceMangler::mangle_region(mangle_region);
  60   }
  61   _reserved = MemRegion((HeapWord*)_virtual_space.low_boundary(),
  62           (HeapWord*)_virtual_space.high_boundary());
  63 }
  64 
  65 GenerationSpec* Generation::spec() {
  66   GenCollectedHeap* gch = GenCollectedHeap::heap();
  67   assert(0 <= level() && level() < gch->_n_gens, "Bad gen level");
  68   return level() == 0 ? gch->gen_policy()->young_gen_spec() : gch->gen_policy()->old_gen_spec();
  69 }
  70 
  71 size_t Generation::max_capacity() const {
  72   return reserved().byte_size();
  73 }
  74 
  75 void Generation::print_heap_change(size_t prev_used) const {
  76   if (PrintGCDetails && Verbose) {
  77     gclog_or_tty->print(" "  SIZE_FORMAT
  78                         "->" SIZE_FORMAT
  79                         "("  SIZE_FORMAT ")",
  80                         prev_used, used(), capacity());
  81   } else {
  82     gclog_or_tty->print(" "  SIZE_FORMAT "K"
  83                         "->" SIZE_FORMAT "K"
  84                         "("  SIZE_FORMAT "K)",
  85                         prev_used / K, used() / K, capacity() / K);
  86   }
  87 }
  88