105 lines
3.9 KiB
C++
105 lines
3.9 KiB
C++
/*
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* Copyright 2000-2002 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*
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*/
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// This kind of "BarrierSet" allows a "CollectedHeap" to detect and
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// enumerate ref fields that have been modified (since the last
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// enumeration), using a card table.
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class OopClosure;
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class Generation;
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class ModRefBarrierSet: public BarrierSet {
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public:
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// Barriers only on ref writes.
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bool has_read_ref_barrier() { return false; }
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bool has_read_prim_barrier() { return false; }
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bool has_write_ref_barrier() { return true; }
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bool has_write_prim_barrier() { return false; }
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bool read_ref_needs_barrier(oop* field) { return false; }
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bool read_prim_needs_barrier(HeapWord* field, size_t bytes) { return false; }
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virtual bool write_ref_needs_barrier(oop* field, oop new_val) = 0;
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bool write_prim_needs_barrier(HeapWord* field, size_t bytes,
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juint val1, juint val2) { return false; }
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void write_prim_field(oop obj, size_t offset, size_t bytes,
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juint val1, juint val2) {}
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void read_ref_field(oop* field) {}
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void read_prim_field(HeapWord* field, size_t bytes) {}
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protected:
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virtual void write_ref_field_work(oop* field, oop new_val) = 0;
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public:
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void write_prim_field(HeapWord* field, size_t bytes,
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juint val1, juint val2) {}
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bool has_read_ref_array_opt() { return false; }
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bool has_read_prim_array_opt() { return false; }
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bool has_write_prim_array_opt() { return false; }
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bool has_read_region_opt() { return false; }
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// These operations should assert false unless the correponding operation
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// above returns true.
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void read_ref_array(MemRegion mr) {
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assert(false, "can't call");
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}
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void read_prim_array(MemRegion mr) {
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assert(false, "can't call");
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}
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void write_prim_array(MemRegion mr) {
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assert(false, "can't call");
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}
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void read_region(MemRegion mr) {
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assert(false, "can't call");
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}
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// Invoke "cl->do_oop" on (the address of) every possibly-modifed
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// reference field in objects in "sp". If "clear" is "true", the oops
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// are no longer considered possibly modified after application of the
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// closure. If' "before_save_marks" is true, oops in objects allocated
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// after the last call to "save_marks" on "sp" will not be considered.
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virtual void mod_oop_in_space_iterate(Space* sp, OopClosure* cl,
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bool clear = false,
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bool before_save_marks = false) = 0;
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// Causes all refs in "mr" to be assumed to be modified.
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virtual void invalidate(MemRegion mr) = 0;
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// The caller guarantees that "mr" contains no references. (Perhaps it's
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// objects have been moved elsewhere.)
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virtual void clear(MemRegion mr) = 0;
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// Pass along the argument to the superclass.
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ModRefBarrierSet(int max_covered_regions) :
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BarrierSet(max_covered_regions) {}
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#ifndef PRODUCT
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// Verifies that the given region contains no modified references.
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virtual void verify_clean_region(MemRegion mr) = 0;
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#endif
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};
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