hotspot/src/share/vm/gc_implementation/g1/heapRegionSeq.inline.hpp
author tonyp
Fri, 10 Jun 2011 13:16:40 -0400
changeset 9989 305a76435cf1
parent 7397 5b173b4ca846
child 12381 1438e0fbfa27
permissions -rw-r--r--
7045330: G1: Simplify/fix the HeapRegionSeq class 7042285: G1: native memory leak during humongous object allocation 6804436: G1: heap region indices should be size_t Summary: A series of fixes and improvements to the HeapRegionSeq class: a) replace the _regions growable array with a standard C array, b) avoid de-allocating / re-allocating HeapRegion instances when the heap shrinks / grows (fix for 7042285), c) introduce fast method to map address to HeapRegion via a "biased" array pointer, d) embed the _hrs object in G1CollectedHeap, instead of pointing to it via an indirection, e) assume that all the regions added to the HeapRegionSeq instance are contiguous, f) replace int's with size_t's for indexes (and expand that to HeapRegion as part of 6804436), g) remove unnecessary / unused methods, h) rename a couple of fields (_alloc_search_start and _seq_bottom), i) fix iterate_from() not to always start from index 0 irrespective of the region passed to it, j) add a verification method to check the HeapRegionSeq assumptions, k) always call the wrappers for _hrs.iterate(), _hrs_length(), and _hrs.at() from G1CollectedHeap, not those methods directly, and l) unify the code that expands the sequence (by either re-using or creating a new HeapRegion) and make it robust wrt to a HeapRegion allocation failing. Reviewed-by: stefank, johnc, brutisso

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#ifndef SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_INLINE_HPP
#define SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_INLINE_HPP

#include "gc_implementation/g1/heapRegion.hpp"
#include "gc_implementation/g1/heapRegionSeq.hpp"

inline size_t HeapRegionSeq::addr_to_index_biased(HeapWord* addr) const {
  assert(_heap_bottom <= addr && addr < _heap_end,
         err_msg("addr: "PTR_FORMAT" bottom: "PTR_FORMAT" end: "PTR_FORMAT,
                 addr, _heap_bottom, _heap_end));
  size_t index = (size_t) addr >> _region_shift;
  return index;
}

inline HeapRegion* HeapRegionSeq::addr_to_region_unsafe(HeapWord* addr) const {
  assert(_heap_bottom <= addr && addr < _heap_end,
         err_msg("addr: "PTR_FORMAT" bottom: "PTR_FORMAT" end: "PTR_FORMAT,
                 addr, _heap_bottom, _heap_end));
  size_t index_biased = addr_to_index_biased(addr);
  HeapRegion* hr = _regions_biased[index_biased];
  assert(hr != NULL, "invariant");
  return hr;
}

inline HeapRegion* HeapRegionSeq::addr_to_region(HeapWord* addr) const {
  if (addr != NULL && addr < _heap_end) {
    assert(addr >= _heap_bottom,
          err_msg("addr: "PTR_FORMAT" bottom: "PTR_FORMAT, addr, _heap_bottom));
    return addr_to_region_unsafe(addr);
  }
  return NULL;
}

inline HeapRegion* HeapRegionSeq::at(size_t index) const {
  assert(index < length(), "pre-condition");
  HeapRegion* hr = _regions[index];
  assert(hr != NULL, "sanity");
  assert(hr->hrs_index() == index, "sanity");
  return hr;
}

#endif // SHARE_VM_GC_IMPLEMENTATION_G1_HEAPREGIONSEQ_INLINE_HPP