219 
 220   // Find a contiguous set of empty regions of length num. Returns the start index of
 221   // that set, or G1_NO_HRM_INDEX.
 222   uint find_contiguous_only_empty(size_t num) { return find_contiguous(num, true); }
 223   // Find a contiguous set of empty or unavailable regions of length num. Returns the
 224   // start index of that set, or G1_NO_HRM_INDEX.
 225   uint find_contiguous_empty_or_unavailable(size_t num) { return find_contiguous(num, false); }
 226 
 227   HeapRegion* next_region_in_heap(const HeapRegion* r) const;
 228 
 229   // Find the highest free or uncommitted region in the reserved heap,
 230   // and if uncommitted, commit it. If none are available, return G1_NO_HRM_INDEX.
 231   // Set the 'expanded' boolean true if a new region was committed.
 232   uint find_highest_free(bool* expanded);
 233 
 234   // Allocate the regions that contain the address range specified, committing the
 235   // regions if necessary. Return false if any of the regions is already committed
 236   // and not free, and return the number of regions newly committed in commit_count.
 237   bool allocate_containing_regions(MemRegion range, size_t* commit_count, WorkGang* pretouch_workers);
 238 
 239   // Apply blk->do_heap_region() on all committed regions in address order,
 240   // terminating the iteration early if do_heap_region() returns true.
 241   void iterate(HeapRegionClosure* blk) const;
 242 
 243   void par_iterate(HeapRegionClosure* blk, HeapRegionClaimer* hrclaimer, const uint start_index) const;
 244 
 245   // Uncommit up to num_regions_to_remove regions that are completely free.
 246   // Return the actual number of uncommitted regions.
 247   uint shrink_by(uint num_regions_to_remove);
 248 
 249   // Uncommit a number of regions starting at the specified index, which must be available,
 250   // empty, and free.
 251   void shrink_at(uint index, size_t num_regions);
 252 
 253   void verify();
 254 
 255   // Do some sanity checking.
 256   void verify_optional() PRODUCT_RETURN;
 257 };
 258 
 259 // The HeapRegionClaimer is used during parallel iteration over heap regions,
 260 // allowing workers to claim heap regions, gaining exclusive rights to these regions.

 219 
 220   // Find a contiguous set of empty regions of length num. Returns the start index of
 221   // that set, or G1_NO_HRM_INDEX.
 222   uint find_contiguous_only_empty(size_t num) { return find_contiguous(num, true); }
 223   // Find a contiguous set of empty or unavailable regions of length num. Returns the
 224   // start index of that set, or G1_NO_HRM_INDEX.
 225   uint find_contiguous_empty_or_unavailable(size_t num) { return find_contiguous(num, false); }
 226 
 227   HeapRegion* next_region_in_heap(const HeapRegion* r) const;
 228 
 229   // Find the highest free or uncommitted region in the reserved heap,
 230   // and if uncommitted, commit it. If none are available, return G1_NO_HRM_INDEX.
 231   // Set the 'expanded' boolean true if a new region was committed.
 232   uint find_highest_free(bool* expanded);
 233 
 234   // Allocate the regions that contain the address range specified, committing the
 235   // regions if necessary. Return false if any of the regions is already committed
 236   // and not free, and return the number of regions newly committed in commit_count.
 237   bool allocate_containing_regions(MemRegion range, size_t* commit_count, WorkGang* pretouch_workers);
 238 
 239   // Apply blk->doHeapRegion() on all committed regions in address order,
 240   // terminating the iteration early if doHeapRegion() returns true.
 241   void iterate(HeapRegionClosure* blk) const;
 242 
 243   void par_iterate(HeapRegionClosure* blk, HeapRegionClaimer* hrclaimer, const uint start_index) const;
 244 
 245   // Uncommit up to num_regions_to_remove regions that are completely free.
 246   // Return the actual number of uncommitted regions.
 247   uint shrink_by(uint num_regions_to_remove);
 248 
 249   // Uncommit a number of regions starting at the specified index, which must be available,
 250   // empty, and free.
 251   void shrink_at(uint index, size_t num_regions);
 252 
 253   void verify();
 254 
 255   // Do some sanity checking.
 256   void verify_optional() PRODUCT_RETURN;
 257 };
 258 
 259 // The HeapRegionClaimer is used during parallel iteration over heap regions,
 260 // allowing workers to claim heap regions, gaining exclusive rights to these regions.