Mercurial > hg > graal-jvmci-8
annotate src/share/vm/oops/objArrayOop.hpp @ 454:df4305d4c1a1
6774607: SIGSEGV or (!is_null(v),"oop value can never be zero") assertion when running with CMS and COOPs
Summary: Use the more permissive set_klass_or_null() and klass_or_null() interfaces in ParNew's workqueue overflow code that manipulates the klass-word.
Reviewed-by: coleenp
author | ysr |
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date | Mon, 24 Nov 2008 09:53:31 -0800 |
parents | 1ee8caae33af |
children | 94b6d06fd759 |
rev | line source |
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0 | 1 /* |
196 | 2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved. |
0 | 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 // An objArrayOop is an array containing oops. | |
26 // Evaluating "String arg[10]" will create an objArrayOop. | |
27 | |
28 class objArrayOopDesc : public arrayOopDesc { | |
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29 friend class objArrayKlass; |
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30 friend class Runtime1; |
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31 friend class psPromotionManager; |
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32 friend class CSMarkOopClosure; |
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33 friend class G1ParScanPartialArrayClosure; |
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34 |
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35 template <class T> T* obj_at_addr(int index) const { |
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36 assert(is_within_bounds(index), "index out of bounds"); |
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37 return &((T*)base())[index]; |
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38 } |
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39 |
0 | 40 public: |
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41 // base is the address following the header. |
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42 HeapWord* base() const { return (HeapWord*) arrayOopDesc::base(T_OBJECT); } |
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43 |
0 | 44 // Accessing |
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45 oop obj_at(int index) const { |
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46 // With UseCompressedOops decode the narrow oop in the objArray to an |
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47 // uncompressed oop. Otherwise this is simply a "*" operator. |
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48 if (UseCompressedOops) { |
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49 return load_decode_heap_oop(obj_at_addr<narrowOop>(index)); |
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50 } else { |
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51 return load_decode_heap_oop(obj_at_addr<oop>(index)); |
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52 } |
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53 } |
0 | 54 |
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55 void obj_at_put(int index, oop value) { |
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56 if (UseCompressedOops) { |
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57 oop_store(obj_at_addr<narrowOop>(index), value); |
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58 } else { |
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59 oop_store(obj_at_addr<oop>(index), value); |
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60 } |
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61 } |
0 | 62 // Sizing |
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63 static int header_size() { return arrayOopDesc::header_size(T_OBJECT); } |
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64 int object_size() { return object_size(length()); } |
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65 int array_size() { return array_size(length()); } |
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66 |
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67 static int object_size(int length) { |
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68 // This returns the object size in HeapWords. |
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69 return align_object_size(header_size() + array_size(length)); |
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70 } |
0 | 71 |
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72 // Give size of objArrayOop in HeapWords minus the header |
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73 static int array_size(int length) { |
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74 // Without UseCompressedOops, this is simply: |
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75 // oop->length() * HeapWordsPerOop; |
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76 // With narrowOops, HeapWordsPerOop is 1/2 or equal 0 as an integer. |
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77 // The oop elements are aligned up to wordSize |
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78 const int HeapWordsPerOop = heapOopSize/HeapWordSize; |
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79 if (HeapWordsPerOop > 0) { |
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80 return length * HeapWordsPerOop; |
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81 } else { |
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82 const int OopsPerHeapWord = HeapWordSize/heapOopSize; |
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83 int word_len = align_size_up(length, OopsPerHeapWord)/OopsPerHeapWord; |
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84 return word_len; |
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85 } |
0 | 86 } |
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87 |
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88 // special iterators for index ranges, returns size of object |
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89 #define ObjArrayOop_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ |
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90 int oop_iterate_range(OopClosureType* blk, int start, int end); |
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91 |
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92 ALL_OOP_OOP_ITERATE_CLOSURES_1(ObjArrayOop_OOP_ITERATE_DECL) |
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93 ALL_OOP_OOP_ITERATE_CLOSURES_2(ObjArrayOop_OOP_ITERATE_DECL) |
0 | 94 }; |