271 

   271 

   272   CardTableModRefBS(MemRegion whole_heap, int max_covered_regions);

   272   CardTableModRefBS(MemRegion whole_heap, int max_covered_regions);

   273 

   273 

   274   // *** Barrier set functions.

   274   // *** Barrier set functions.

   275 

   275 

   277     // Note that this assumes the perm gen is the highest generation

   277     // Note that this assumes the perm gen is the highest generation

   278     // in the address space

   278     // in the address space

   279     return new_val != NULL && !new_val->is_perm();

   279     return new_val != NULL && !new_val->is_perm();

   280   }

   280   }

   281 

   281 

   283   // The scanning code has to handle the fact that the write barrier may be

   283   // The scanning code has to handle the fact that the write barrier may be

   284   // either precise or imprecise. We make non-virtual inline variants of

   284   // either precise or imprecise. We make non-virtual inline variants of

   285   // these functions here for performance.

   285   // these functions here for performance.

   286 protected:

   286 protected:

   287   void write_ref_field_work(oop obj, size_t offset, oop newVal);

   287   void write_ref_field_work(oop obj, size_t offset, oop newVal);

   289 public:

   289 public:

   290 

   290 

   291   bool has_write_ref_array_opt() { return true; }

   291   bool has_write_ref_array_opt() { return true; }

   292   bool has_write_region_opt() { return true; }

   292   bool has_write_region_opt() { return true; }

   293 

   293 

   313     return is_card_aligned(addr);

   313     return is_card_aligned(addr);

   314   }

   314   }

   315 

   315 

   316   // *** Card-table-barrier-specific things.

   316   // *** Card-table-barrier-specific things.

   317 

   317 

   319     jbyte* byte = byte_for(field);

   319     jbyte* byte = byte_for(field);

   320     *byte = dirty_card;

   320     *byte = dirty_card;

   321   }

   321   }

   322 

   322 

   323   // Card marking array base (adjusted for heap low boundary)

   323   // Card marking array base (adjusted for heap low boundary)