268
269 // Support for java.lang.Runtime.maxMemory(): return the maximum amount of
270 // memory that the vm could make available for storing 'normal' java objects.
271 // This is based on the reserved address space, but should not include space
272 // that the vm uses internally for bookkeeping or temporary storage
273 // (e.g., in the case of the young gen, one of the survivor
274 // spaces).
275 virtual size_t max_capacity() const = 0;
276
277 // Returns "TRUE" iff "p" points into the committed areas of the heap.
278 // This method can be expensive so avoid using it in performance critical
279 // code.
280 virtual bool is_in(const void* p) const = 0;
281
282 DEBUG_ONLY(bool is_in_or_null(const void* p) const { return p == nullptr || is_in(p); })
283
284 void set_gc_cause(GCCause::Cause v);
285 GCCause::Cause gc_cause() { return _gc_cause; }
286
287 oop obj_allocate(Klass* klass, size_t size, TRAPS);
288 virtual oop array_allocate(Klass* klass, size_t size, int length, bool do_zero, TRAPS);
289 oop class_allocate(Klass* klass, size_t size, TRAPS);
290
291 // Utilities for turning raw memory into filler objects.
292 //
293 // min_fill_size() is the smallest region that can be filled.
294 // fill_with_objects() can fill arbitrary-sized regions of the heap using
295 // multiple objects. fill_with_object() is for regions known to be smaller
296 // than the largest array of integers; it uses a single object to fill the
297 // region and has slightly less overhead.
298 static size_t min_fill_size() {
299 return size_t(align_object_size(oopDesc::header_size()));
300 }
301
302 static void fill_with_objects(HeapWord* start, size_t words, bool zap = true);
303
304 static void fill_with_object(HeapWord* start, size_t words, bool zap = true);
305 static void fill_with_object(MemRegion region, bool zap = true) {
306 fill_with_object(region.start(), region.word_size(), zap);
307 }
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268
269 // Support for java.lang.Runtime.maxMemory(): return the maximum amount of
270 // memory that the vm could make available for storing 'normal' java objects.
271 // This is based on the reserved address space, but should not include space
272 // that the vm uses internally for bookkeeping or temporary storage
273 // (e.g., in the case of the young gen, one of the survivor
274 // spaces).
275 virtual size_t max_capacity() const = 0;
276
277 // Returns "TRUE" iff "p" points into the committed areas of the heap.
278 // This method can be expensive so avoid using it in performance critical
279 // code.
280 virtual bool is_in(const void* p) const = 0;
281
282 DEBUG_ONLY(bool is_in_or_null(const void* p) const { return p == nullptr || is_in(p); })
283
284 void set_gc_cause(GCCause::Cause v);
285 GCCause::Cause gc_cause() { return _gc_cause; }
286
287 oop obj_allocate(Klass* klass, size_t size, TRAPS);
288 oop obj_buffer_allocate(Klass* klass, size_t size, TRAPS); // doesn't clear memory
289 virtual oop array_allocate(Klass* klass, size_t size, int length, bool do_zero, TRAPS);
290 oop class_allocate(Klass* klass, size_t size, TRAPS);
291
292 // Utilities for turning raw memory into filler objects.
293 //
294 // min_fill_size() is the smallest region that can be filled.
295 // fill_with_objects() can fill arbitrary-sized regions of the heap using
296 // multiple objects. fill_with_object() is for regions known to be smaller
297 // than the largest array of integers; it uses a single object to fill the
298 // region and has slightly less overhead.
299 static size_t min_fill_size() {
300 return size_t(align_object_size(oopDesc::header_size()));
301 }
302
303 static void fill_with_objects(HeapWord* start, size_t words, bool zap = true);
304
305 static void fill_with_object(HeapWord* start, size_t words, bool zap = true);
306 static void fill_with_object(MemRegion region, bool zap = true) {
307 fill_with_object(region.start(), region.word_size(), zap);
308 }
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