6906727: UseCompressedOops: some card-marking fixes related to object arrays
Summary: Introduced a new write_ref_array(HeapWords* start, size_t count) method that does the requisite MemRegion range calculation so (some of the) clients of the erstwhile write_ref_array(MemRegion mr) do not need to worry. This removed all external uses of array_size(), which was also simplified and made private. Asserts were added to catch other possible issues. Further, less essential, fixes stemming from this investigation are deferred to CR 6904516 (to follow shortly in hs17).
Reviewed-by: kvn, coleenp, jmasa
/*
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* accompanied this code).
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* 2 along with this work; if not, write to the Free Software Foundation,
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class GenMarkSweep : public MarkSweep {
friend class VM_MarkSweep;
friend class G1MarkSweep;
public:
static void invoke_at_safepoint(int level, ReferenceProcessor* rp,
bool clear_all_softrefs);
private:
// Mark live objects
static void mark_sweep_phase1(int level, bool clear_all_softrefs);
// Calculate new addresses
static void mark_sweep_phase2();
// Update pointers
static void mark_sweep_phase3(int level);
// Move objects to new positions
static void mark_sweep_phase4();
// Temporary data structures for traversal and storing/restoring marks
static void allocate_stacks();
static void deallocate_stacks();
};