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src/hotspot/share/gc/shared/collectedHeap.hpp

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272   // Support for java.lang.Runtime.maxMemory():  return the maximum amount of
273   // memory that the vm could make available for storing 'normal' java objects.
274   // This is based on the reserved address space, but should not include space
275   // that the vm uses internally for bookkeeping or temporary storage
276   // (e.g., in the case of the young gen, one of the survivor
277   // spaces).
278   virtual size_t max_capacity() const = 0;
279 
280   // Returns "TRUE" iff "p" points into the committed areas of the heap.
281   // This method can be expensive so avoid using it in performance critical
282   // code.
283   virtual bool is_in(const void* p) const = 0;
284 
285   DEBUG_ONLY(bool is_in_or_null(const void* p) const { return p == nullptr || is_in(p); })
286 
287   void set_gc_cause(GCCause::Cause v);
288   GCCause::Cause gc_cause() { return _gc_cause; }
289 
290   oop obj_allocate(Klass* klass, size_t size, TRAPS);
291   virtual oop array_allocate(Klass* klass, size_t size, int length, bool do_zero, TRAPS);
292   oop class_allocate(Klass* klass, size_t size, TRAPS);
293 
294   // Utilities for turning raw memory into filler objects.
295   //
296   // min_fill_size() is the smallest region that can be filled.
297   // fill_with_objects() can fill arbitrary-sized regions of the heap using
298   // multiple objects.  fill_with_object() is for regions known to be smaller
299   // than the largest array of integers; it uses a single object to fill the
300   // region and has slightly less overhead.
301   static size_t min_fill_size() {
302     return size_t(align_object_size(oopDesc::header_size()));
303   }
304 
305   static void fill_with_objects(HeapWord* start, size_t words, bool zap = true);
306 
307   static void fill_with_object(HeapWord* start, size_t words, bool zap = true);
308   static void fill_with_object(MemRegion region, bool zap = true) {
309     fill_with_object(region.start(), region.word_size(), zap);
310   }
311   static void fill_with_object(HeapWord* start, HeapWord* end, bool zap = true) {
312     fill_with_object(start, pointer_delta(end, start), zap);

272   // Support for java.lang.Runtime.maxMemory():  return the maximum amount of
273   // memory that the vm could make available for storing 'normal' java objects.
274   // This is based on the reserved address space, but should not include space
275   // that the vm uses internally for bookkeeping or temporary storage
276   // (e.g., in the case of the young gen, one of the survivor
277   // spaces).
278   virtual size_t max_capacity() const = 0;
279 
280   // Returns "TRUE" iff "p" points into the committed areas of the heap.
281   // This method can be expensive so avoid using it in performance critical
282   // code.
283   virtual bool is_in(const void* p) const = 0;
284 
285   DEBUG_ONLY(bool is_in_or_null(const void* p) const { return p == nullptr || is_in(p); })
286 
287   void set_gc_cause(GCCause::Cause v);
288   GCCause::Cause gc_cause() { return _gc_cause; }
289 
290   oop obj_allocate(Klass* klass, size_t size, TRAPS);
291   virtual oop array_allocate(Klass* klass, size_t size, int length, bool do_zero, TRAPS);
292   oop class_allocate(Klass* klass, size_t size, size_t base_size, TRAPS);
293 
294   // Utilities for turning raw memory into filler objects.
295   //
296   // min_fill_size() is the smallest region that can be filled.
297   // fill_with_objects() can fill arbitrary-sized regions of the heap using
298   // multiple objects.  fill_with_object() is for regions known to be smaller
299   // than the largest array of integers; it uses a single object to fill the
300   // region and has slightly less overhead.
301   static size_t min_fill_size() {
302     return size_t(align_object_size(oopDesc::header_size()));
303   }
304 
305   static void fill_with_objects(HeapWord* start, size_t words, bool zap = true);
306 
307   static void fill_with_object(HeapWord* start, size_t words, bool zap = true);
308   static void fill_with_object(MemRegion region, bool zap = true) {
309     fill_with_object(region.start(), region.word_size(), zap);
310   }
311   static void fill_with_object(HeapWord* start, HeapWord* end, bool zap = true) {
312     fill_with_object(start, pointer_delta(end, start), zap);
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