--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/gc/cms/freeChunk.cpp Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2001, 2017, 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/cms/freeChunk.hpp"
+#include "utilities/copy.hpp"
+
+#ifndef PRODUCT
+
+#define baadbabeHeapWord badHeapWordVal
+#define deadbeefHeapWord 0xdeadbeef
+
+size_t const FreeChunk::header_size() {
+ return sizeof(FreeChunk)/HeapWordSize;
+}
+
+void FreeChunk::mangleAllocated(size_t size) {
+ // mangle all but the header of a just-allocated block
+ // of storage
+ assert(size >= MinChunkSize, "smallest size of object");
+ // we can't assert that _size == size because this may be an
+ // allocation out of a linear allocation block
+ assert(sizeof(FreeChunk) % HeapWordSize == 0,
+ "shouldn't write beyond chunk");
+ HeapWord* addr = (HeapWord*)this;
+ size_t hdr = header_size();
+ Copy::fill_to_words(addr + hdr, size - hdr, baadbabeHeapWord);
+}
+
+void FreeChunk::mangleFreed(size_t sz) {
+ assert(baadbabeHeapWord != deadbeefHeapWord, "Need distinct patterns");
+ // mangle all but the header of a just-freed block of storage
+ // just prior to passing it to the storage dictionary
+ assert(sz >= MinChunkSize, "smallest size of object");
+ assert(sz == size(), "just checking");
+ HeapWord* addr = (HeapWord*)this;
+ size_t hdr = header_size();
+ Copy::fill_to_words(addr + hdr, sz - hdr, deadbeefHeapWord);
+}
+
+void FreeChunk::verifyList() const {
+ FreeChunk* nextFC = next();
+ if (nextFC != NULL) {
+ assert(this == nextFC->prev(), "broken chain");
+ assert(size() == nextFC->size(), "wrong size");
+ nextFC->verifyList();
+ }
+}
+#endif
+
+void FreeChunk::print_on(outputStream* st) {
+ st->print_cr("Next: " PTR_FORMAT " Prev: " PTR_FORMAT " %s",
+ p2i(next()), p2i(prev()), cantCoalesce() ? "[can't coalesce]" : "");
+}