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1 /*
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196
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2 * Copyright 2001-2008 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 # include "incls/_precompiled.incl"
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26 # include "incls/_freeChunk.cpp.incl"
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27
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28 #ifndef PRODUCT
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29
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30 #define baadbabeHeapWord badHeapWordVal
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31 #define deadbeefHeapWord 0xdeadbeef
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32
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33 size_t const FreeChunk::header_size() {
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34 return sizeof(FreeChunk)/HeapWordSize;
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35 }
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36
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37 void FreeChunk::mangleAllocated(size_t size) {
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38 // mangle all but the header of a just-allocated block
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39 // of storage
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40 assert(size >= MinChunkSize, "smallest size of object");
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41 // we can't assert that _size == size because this may be an
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42 // allocation out of a linear allocation block
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43 assert(sizeof(FreeChunk) % HeapWordSize == 0,
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44 "shouldn't write beyond chunk");
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45 HeapWord* addr = (HeapWord*)this;
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46 size_t hdr = header_size();
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47 Copy::fill_to_words(addr + hdr, size - hdr, baadbabeHeapWord);
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48 }
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49
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187
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50 void FreeChunk::mangleFreed(size_t sz) {
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51 assert(baadbabeHeapWord != deadbeefHeapWord, "Need distinct patterns");
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52 // mangle all but the header of a just-freed block of storage
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53 // just prior to passing it to the storage dictionary
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187
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54 assert(sz >= MinChunkSize, "smallest size of object");
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55 assert(sz == size(), "just checking");
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56 HeapWord* addr = (HeapWord*)this;
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57 size_t hdr = header_size();
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58 Copy::fill_to_words(addr + hdr, sz - hdr, deadbeefHeapWord);
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59 }
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60
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61 void FreeChunk::verifyList() const {
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62 FreeChunk* nextFC = next();
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63 if (nextFC != NULL) {
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64 assert(this == nextFC->prev(), "broken chain");
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65 assert(size() == nextFC->size(), "wrong size");
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66 nextFC->verifyList();
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67 }
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68 }
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69 #endif
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