diff src/hotspot/share/gc/shared/markBitMap.cpp @ 52321:31b159f30fb2

8180193: Make marking bitmap code available to other GCs Reviewed-by: shade, stefank
author rkennke
date Wed, 29 Aug 2018 20:15:09 +0200
parents
children 5b87d3fc1093
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--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/shared/markBitMap.cpp	Wed Aug 29 20:15:09 2018 +0200
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * 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.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+
+#include "precompiled.hpp"
+#include "gc/shared/markBitMap.inline.hpp"
+#include "memory/virtualspace.hpp"
+
+void MarkBitMap::print_on_error(outputStream* st, const char* prefix) const {
+  _bm.print_on_error(st, prefix);
+}
+
+size_t MarkBitMap::compute_size(size_t heap_size) {
+  return ReservedSpace::allocation_align_size_up(heap_size / mark_distance());
+}
+
+size_t MarkBitMap::mark_distance() {
+  return MinObjAlignmentInBytes * BitsPerByte;
+}
+
+void MarkBitMap::initialize(MemRegion heap, MemRegion storage) {
+  _covered = heap;
+
+  _bm = BitMapView((BitMap::bm_word_t*) storage.start(), _covered.word_size() >> _shifter);
+}
+
+void MarkBitMap::clear_range(MemRegion mr) {
+  MemRegion intersection = mr.intersection(_covered);
+  assert(!intersection.is_empty(),
+         "Given range from " PTR_FORMAT " to " PTR_FORMAT " is completely outside the heap",
+         p2i(mr.start()), p2i(mr.end()));
+  // convert address range into offset range
+  _bm.at_put_range(addr_to_offset(intersection.start()),
+                   addr_to_offset(intersection.end()), false);
+}
+
+#ifdef ASSERT
+void MarkBitMap::check_mark(HeapWord* addr) {
+  assert(Universe::heap()->is_in_reserved(addr),
+         "Trying to access bitmap " PTR_FORMAT " for address " PTR_FORMAT " not in the heap.",
+         p2i(this), p2i(addr));
+}
+#endif