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hotspot/src/share/vm/gc_implementation/concurrentMarkSweep/freeChunk.cpp

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+/*
+ * Copyright 2001-2006 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+# include "incls/_precompiled.incl"
+# include "incls/_freeChunk.cpp.incl"
+
+#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 size) {
+  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(size >= MinChunkSize, "smallest size of object");
+  assert(size == _size, "just checking");
+  HeapWord* addr = (HeapWord*)this;
+  size_t hdr = header_size();
+  Copy::fill_to_words(addr + hdr, size - 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