1 /* 2 * Copyright (c) 2001, 2008, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 # include "incls/_precompiled.incl" 26 # include "incls/_freeChunk.cpp.incl" 27 28 #ifndef PRODUCT 29 30 #define baadbabeHeapWord badHeapWordVal 31 #define deadbeefHeapWord 0xdeadbeef 32 33 size_t const FreeChunk::header_size() { 34 return sizeof(FreeChunk)/HeapWordSize; 35 } 36 37 void FreeChunk::mangleAllocated(size_t size) { 38 // mangle all but the header of a just-allocated block 39 // of storage 40 assert(size >= MinChunkSize, "smallest size of object"); 41 // we can't assert that _size == size because this may be an 42 // allocation out of a linear allocation block 43 assert(sizeof(FreeChunk) % HeapWordSize == 0, 44 "shouldn't write beyond chunk"); 45 HeapWord* addr = (HeapWord*)this; 46 size_t hdr = header_size(); 47 Copy::fill_to_words(addr + hdr, size - hdr, baadbabeHeapWord); 48 } 49 50 void FreeChunk::mangleFreed(size_t sz) { 51 assert(baadbabeHeapWord != deadbeefHeapWord, "Need distinct patterns"); 52 // mangle all but the header of a just-freed block of storage 53 // just prior to passing it to the storage dictionary 54 assert(sz >= MinChunkSize, "smallest size of object"); 55 assert(sz == size(), "just checking"); 56 HeapWord* addr = (HeapWord*)this; 57 size_t hdr = header_size(); 58 Copy::fill_to_words(addr + hdr, sz - hdr, deadbeefHeapWord); 59 } 60 61 void FreeChunk::verifyList() const { 62 FreeChunk* nextFC = next(); 63 if (nextFC != NULL) { 64 assert(this == nextFC->prev(), "broken chain"); 65 assert(size() == nextFC->size(), "wrong size"); 66 nextFC->verifyList(); 67 } 68 } 69 #endif 70 71 void FreeChunk::print_on(outputStream* st) { 72 st->print_cr("Next: " PTR_FORMAT " Prev: " PTR_FORMAT " %s", 73 next(), prev(), cantCoalesce() ? "[can't coalesce]" : ""); 74 }