Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/concurrentMarkSweep/freeChunk.cpp @ 20254:9fec19bb0659
8032379: Remove the is_scavenging flag to process_strong_roots
Summary: Refactor the strong root processing to avoid using a boolean in addition to the ScanOption enum.
Reviewed-by: stefank, tschatzl, ehelin, jmasa
author | mgerdin |
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date | Tue, 14 Jan 2014 16:40:33 +0100 |
parents | 78bbf4d43a14 |
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0 | 1 /* |
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2 * Copyright (c) 2001, 2014, Oracle and/or its affiliates. All rights reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
6026 | 26 #include "gc_implementation/concurrentMarkSweep/freeChunk.hpp" |
27 #include "memory/freeBlockDictionary.hpp" | |
1972 | 28 #include "utilities/copy.hpp" |
0 | 29 |
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30 PRAGMA_FORMAT_MUTE_WARNINGS_FOR_GCC |
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31 |
0 | 32 #ifndef PRODUCT |
33 | |
34 #define baadbabeHeapWord badHeapWordVal | |
35 #define deadbeefHeapWord 0xdeadbeef | |
36 | |
37 size_t const FreeChunk::header_size() { | |
38 return sizeof(FreeChunk)/HeapWordSize; | |
39 } | |
40 | |
41 void FreeChunk::mangleAllocated(size_t size) { | |
42 // mangle all but the header of a just-allocated block | |
43 // of storage | |
44 assert(size >= MinChunkSize, "smallest size of object"); | |
45 // we can't assert that _size == size because this may be an | |
46 // allocation out of a linear allocation block | |
47 assert(sizeof(FreeChunk) % HeapWordSize == 0, | |
48 "shouldn't write beyond chunk"); | |
49 HeapWord* addr = (HeapWord*)this; | |
50 size_t hdr = header_size(); | |
51 Copy::fill_to_words(addr + hdr, size - hdr, baadbabeHeapWord); | |
52 } | |
53 | |
187 | 54 void FreeChunk::mangleFreed(size_t sz) { |
0 | 55 assert(baadbabeHeapWord != deadbeefHeapWord, "Need distinct patterns"); |
56 // mangle all but the header of a just-freed block of storage | |
57 // just prior to passing it to the storage dictionary | |
187 | 58 assert(sz >= MinChunkSize, "smallest size of object"); |
59 assert(sz == size(), "just checking"); | |
0 | 60 HeapWord* addr = (HeapWord*)this; |
61 size_t hdr = header_size(); | |
187 | 62 Copy::fill_to_words(addr + hdr, sz - hdr, deadbeefHeapWord); |
0 | 63 } |
64 | |
65 void FreeChunk::verifyList() const { | |
66 FreeChunk* nextFC = next(); | |
67 if (nextFC != NULL) { | |
68 assert(this == nextFC->prev(), "broken chain"); | |
69 assert(size() == nextFC->size(), "wrong size"); | |
70 nextFC->verifyList(); | |
71 } | |
72 } | |
73 #endif | |
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74 |
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75 void FreeChunk::print_on(outputStream* st) { |
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76 st->print_cr("Next: " PTR_FORMAT " Prev: " PTR_FORMAT " %s", |
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77 next(), prev(), cantCoalesce() ? "[can't coalesce]" : ""); |
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78 } |