1.1 --- a/src/share/vm/gc_interface/collectedHeap.hpp Wed Dec 10 23:46:10 2008 -0800
1.2 +++ b/src/share/vm/gc_interface/collectedHeap.hpp Thu Dec 11 12:05:08 2008 -0800
1.3 @@ -47,6 +47,9 @@
1.4 static int _fire_out_of_memory_count;
1.5 #endif
1.6
1.7 + // Used for filler objects (static, but initialized in ctor).
1.8 + static size_t _filler_array_max_size;
1.9 +
1.10 protected:
1.11 MemRegion _reserved;
1.12 BarrierSet* _barrier_set;
1.13 @@ -119,6 +122,21 @@
1.14 // Clears an allocated object.
1.15 inline static void init_obj(HeapWord* obj, size_t size);
1.16
1.17 + // Filler object utilities.
1.18 + static inline size_t filler_array_hdr_size();
1.19 + static inline size_t filler_array_min_size();
1.20 + static inline size_t filler_array_max_size();
1.21 +
1.22 + DEBUG_ONLY(static void fill_args_check(HeapWord* start, size_t words);)
1.23 + DEBUG_ONLY(static void zap_filler_array(HeapWord* start, size_t words);)
1.24 +
1.25 + // Fill with a single array; caller must ensure filler_array_min_size() <=
1.26 + // words <= filler_array_max_size().
1.27 + static inline void fill_with_array(HeapWord* start, size_t words);
1.28 +
1.29 + // Fill with a single object (either an int array or a java.lang.Object).
1.30 + static inline void fill_with_object_impl(HeapWord* start, size_t words);
1.31 +
1.32 // Verification functions
1.33 virtual void check_for_bad_heap_word_value(HeapWord* addr, size_t size)
1.34 PRODUCT_RETURN;
1.35 @@ -294,6 +312,27 @@
1.36 // The boundary between a "large" and "small" array of primitives, in words.
1.37 virtual size_t large_typearray_limit() = 0;
1.38
1.39 + // Utilities for turning raw memory into filler objects.
1.40 + //
1.41 + // min_fill_size() is the smallest region that can be filled.
1.42 + // fill_with_objects() can fill arbitrary-sized regions of the heap using
1.43 + // multiple objects. fill_with_object() is for regions known to be smaller
1.44 + // than the largest array of integers; it uses a single object to fill the
1.45 + // region and has slightly less overhead.
1.46 + static size_t min_fill_size() {
1.47 + return size_t(align_object_size(oopDesc::header_size()));
1.48 + }
1.49 +
1.50 + static void fill_with_objects(HeapWord* start, size_t words);
1.51 +
1.52 + static void fill_with_object(HeapWord* start, size_t words);
1.53 + static void fill_with_object(MemRegion region) {
1.54 + fill_with_object(region.start(), region.word_size());
1.55 + }
1.56 + static void fill_with_object(HeapWord* start, HeapWord* end) {
1.57 + fill_with_object(start, pointer_delta(end, start));
1.58 + }
1.59 +
1.60 // Some heaps may offer a contiguous region for shared non-blocking
1.61 // allocation, via inlined code (by exporting the address of the top and
1.62 // end fields defining the extent of the contiguous allocation region.)
