Mercurial > hg > truffle
annotate src/share/vm/gc_implementation/shared/vmGCOperations.hpp @ 1375:e0a1a502e402 jdk7-b91
Added tag jdk7-b90 for changeset 605c9707a766
author | mikejwre |
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date | Thu, 22 Apr 2010 16:54:23 -0700 |
parents | c6c601a0f2d6 |
children | 0bfd3fb24150 |
rev | line source |
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0 | 1 /* |
196 | 2 * Copyright 2005-2008 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 // The following class hierarchy represents | |
26 // a set of operations (VM_Operation) related to GC. | |
27 // | |
28 // VM_Operation | |
29 // VM_GC_Operation | |
30 // VM_GC_HeapInspection | |
31 // VM_GenCollectForAllocation | |
32 // VM_GenCollectFull | |
33 // VM_GenCollectFullConcurrent | |
34 // VM_ParallelGCFailedAllocation | |
35 // VM_ParallelGCFailedPermanentAllocation | |
36 // VM_ParallelGCSystemGC | |
37 // VM_GC_Operation | |
38 // - implements methods common to all classes in the hierarchy: | |
39 // prevents multiple gc requests and manages lock on heap; | |
40 // | |
41 // VM_GC_HeapInspection | |
42 // - prints class histogram on SIGBREAK if PrintClassHistogram | |
43 // is specified; and also the attach "inspectheap" operation | |
44 // | |
45 // VM_GenCollectForAllocation | |
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46 // VM_GenCollectForPermanentAllocation |
0 | 47 // VM_ParallelGCFailedAllocation |
48 // VM_ParallelGCFailedPermanentAllocation | |
49 // - this operation is invoked when allocation is failed; | |
50 // operation performs garbage collection and tries to | |
51 // allocate afterwards; | |
52 // | |
53 // VM_GenCollectFull | |
54 // VM_GenCollectFullConcurrent | |
55 // VM_ParallelGCSystemGC | |
56 // - these operations preform full collection of heaps of | |
57 // different kind | |
58 // | |
59 | |
60 class VM_GC_Operation: public VM_Operation { | |
61 protected: | |
62 BasicLock _pending_list_basic_lock; // for refs pending list notification (PLL) | |
63 unsigned int _gc_count_before; // gc count before acquiring PLL | |
64 unsigned int _full_gc_count_before; // full gc count before acquiring PLL | |
65 bool _full; // whether a "full" collection | |
66 bool _prologue_succeeded; // whether doit_prologue succeeded | |
67 GCCause::Cause _gc_cause; // the putative cause for this gc op | |
68 bool _gc_locked; // will be set if gc was locked | |
69 | |
70 virtual bool skip_operation() const; | |
71 | |
72 // java.lang.ref.Reference support | |
73 void acquire_pending_list_lock(); | |
74 void release_and_notify_pending_list_lock(); | |
75 | |
76 public: | |
77 VM_GC_Operation(unsigned int gc_count_before, | |
78 unsigned int full_gc_count_before = 0, | |
79 bool full = false) { | |
80 _full = full; | |
81 _prologue_succeeded = false; | |
82 _gc_count_before = gc_count_before; | |
83 | |
84 // A subclass constructor will likely overwrite the following | |
85 _gc_cause = GCCause::_no_cause_specified; | |
86 | |
87 _gc_locked = false; | |
88 | |
89 if (full) { | |
90 _full_gc_count_before = full_gc_count_before; | |
91 } | |
92 } | |
93 ~VM_GC_Operation() {} | |
94 | |
95 // Acquire the reference synchronization lock | |
96 virtual bool doit_prologue(); | |
97 // Do notifyAll (if needed) and release held lock | |
98 virtual void doit_epilogue(); | |
99 | |
100 virtual bool allow_nested_vm_operations() const { return true; } | |
101 bool prologue_succeeded() const { return _prologue_succeeded; } | |
102 | |
103 void set_gc_locked() { _gc_locked = true; } | |
104 bool gc_locked() const { return _gc_locked; } | |
105 | |
106 static void notify_gc_begin(bool full = false); | |
107 static void notify_gc_end(); | |
108 }; | |
109 | |
110 | |
111 class VM_GC_HeapInspection: public VM_GC_Operation { | |
112 private: | |
113 outputStream* _out; | |
114 bool _full_gc; | |
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115 bool _need_prologue; |
0 | 116 public: |
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117 VM_GC_HeapInspection(outputStream* out, bool request_full_gc, |
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118 bool need_prologue) : |
0 | 119 VM_GC_Operation(0 /* total collections, dummy, ignored */, |
120 0 /* total full collections, dummy, ignored */, | |
121 request_full_gc) { | |
122 _out = out; | |
123 _full_gc = request_full_gc; | |
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124 _need_prologue = need_prologue; |
0 | 125 } |
126 | |
127 ~VM_GC_HeapInspection() {} | |
128 virtual VMOp_Type type() const { return VMOp_GC_HeapInspection; } | |
129 virtual bool skip_operation() const; | |
130 virtual bool doit_prologue(); | |
131 virtual void doit(); | |
132 }; | |
133 | |
134 | |
135 class VM_GenCollectForAllocation: public VM_GC_Operation { | |
136 private: | |
137 HeapWord* _res; | |
138 size_t _size; // size of object to be allocated. | |
139 bool _tlab; // alloc is of a tlab. | |
140 public: | |
141 VM_GenCollectForAllocation(size_t size, | |
142 bool tlab, | |
143 unsigned int gc_count_before) | |
144 : VM_GC_Operation(gc_count_before), | |
145 _size(size), | |
146 _tlab(tlab) { | |
147 _res = NULL; | |
148 } | |
149 ~VM_GenCollectForAllocation() {} | |
150 virtual VMOp_Type type() const { return VMOp_GenCollectForAllocation; } | |
151 virtual void doit(); | |
152 HeapWord* result() const { return _res; } | |
153 }; | |
154 | |
155 | |
156 // VM operation to invoke a collection of the heap as a | |
157 // GenCollectedHeap heap. | |
158 class VM_GenCollectFull: public VM_GC_Operation { | |
159 private: | |
160 int _max_level; | |
161 public: | |
162 VM_GenCollectFull(unsigned int gc_count_before, | |
163 unsigned int full_gc_count_before, | |
164 GCCause::Cause gc_cause, | |
165 int max_level) | |
166 : VM_GC_Operation(gc_count_before, full_gc_count_before, true /* full */), | |
167 _max_level(max_level) | |
168 { _gc_cause = gc_cause; } | |
169 ~VM_GenCollectFull() {} | |
170 virtual VMOp_Type type() const { return VMOp_GenCollectFull; } | |
171 virtual void doit(); | |
172 }; | |
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173 |
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174 class VM_GenCollectForPermanentAllocation: public VM_GC_Operation { |
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175 private: |
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176 HeapWord* _res; |
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177 size_t _size; // size of object to be allocated |
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178 public: |
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179 VM_GenCollectForPermanentAllocation(size_t size, |
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180 unsigned int gc_count_before, |
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181 unsigned int full_gc_count_before, |
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182 GCCause::Cause gc_cause) |
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183 : VM_GC_Operation(gc_count_before, full_gc_count_before, true), |
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184 _size(size) { |
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185 _res = NULL; |
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186 _gc_cause = gc_cause; |
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187 } |
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188 ~VM_GenCollectForPermanentAllocation() {} |
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189 virtual VMOp_Type type() const { return VMOp_GenCollectForPermanentAllocation; } |
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190 virtual void doit(); |
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191 HeapWord* result() const { return _res; } |
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192 }; |