Mercurial > hg > graal-compiler
comparison src/share/vm/memory/iterator.hpp @ 0:a61af66fc99e jdk7-b24
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author | duke |
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date | Sat, 01 Dec 2007 00:00:00 +0000 |
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children | ba764ed4b6f2 |
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1 /* | |
2 * Copyright 1997-2006 Sun Microsystems, Inc. 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 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 classes are C++ `closures` for iterating over objects, roots and spaces | |
26 | |
27 class ReferenceProcessor; | |
28 | |
29 // OopClosure is used for iterating through roots (oop*) | |
30 | |
31 class OopClosure : public StackObj { | |
32 public: | |
33 ReferenceProcessor* _ref_processor; | |
34 OopClosure(ReferenceProcessor* rp) : _ref_processor(rp) { } | |
35 OopClosure() : _ref_processor(NULL) { } | |
36 virtual void do_oop(oop* o) = 0; | |
37 virtual void do_oop_v(oop* o) { do_oop(o); } | |
38 | |
39 // In support of post-processing of weak links of KlassKlass objects; | |
40 // see KlassKlass::oop_oop_iterate(). | |
41 virtual const bool should_remember_klasses() const { return false; } | |
42 virtual void remember_klass(Klass* k) { /* do nothing */ } | |
43 | |
44 // If "true", invoke on nmethods (when scanning compiled frames). | |
45 virtual const bool do_nmethods() const { return false; } | |
46 | |
47 // The methods below control how object iterations invoking this closure | |
48 // should be performed: | |
49 | |
50 // If "true", invoke on header klass field. | |
51 bool do_header() { return true; } // Note that this is non-virtual. | |
52 // Controls how prefetching is done for invocations of this closure. | |
53 Prefetch::style prefetch_style() { // Note that this is non-virtual. | |
54 return Prefetch::do_none; | |
55 } | |
56 }; | |
57 | |
58 // ObjectClosure is used for iterating through an object space | |
59 | |
60 class ObjectClosure : public StackObj { | |
61 public: | |
62 // Called for each object. | |
63 virtual void do_object(oop obj) = 0; | |
64 }; | |
65 | |
66 | |
67 class BoolObjectClosure : public ObjectClosure { | |
68 public: | |
69 virtual bool do_object_b(oop obj) = 0; | |
70 }; | |
71 | |
72 // Applies an oop closure to all ref fields in objects iterated over in an | |
73 // object iteration. | |
74 class ObjectToOopClosure: public ObjectClosure { | |
75 OopClosure* _cl; | |
76 public: | |
77 void do_object(oop obj); | |
78 ObjectToOopClosure(OopClosure* cl) : _cl(cl) {} | |
79 }; | |
80 | |
81 // A version of ObjectClosure with "memory" (see _previous_address below) | |
82 class UpwardsObjectClosure: public BoolObjectClosure { | |
83 HeapWord* _previous_address; | |
84 public: | |
85 UpwardsObjectClosure() : _previous_address(NULL) { } | |
86 void set_previous(HeapWord* addr) { _previous_address = addr; } | |
87 HeapWord* previous() { return _previous_address; } | |
88 // A return value of "true" can be used by the caller to decide | |
89 // if this object's end should *NOT* be recorded in | |
90 // _previous_address above. | |
91 virtual bool do_object_bm(oop obj, MemRegion mr) = 0; | |
92 }; | |
93 | |
94 // A version of ObjectClosure that is expected to be robust | |
95 // in the face of possibly uninitialized objects. | |
96 class ObjectClosureCareful : public ObjectClosure { | |
97 public: | |
98 virtual size_t do_object_careful_m(oop p, MemRegion mr) = 0; | |
99 virtual size_t do_object_careful(oop p) = 0; | |
100 }; | |
101 | |
102 // The following are used in CompactibleFreeListSpace and | |
103 // ConcurrentMarkSweepGeneration. | |
104 | |
105 // Blk closure (abstract class) | |
106 class BlkClosure : public StackObj { | |
107 public: | |
108 virtual size_t do_blk(HeapWord* addr) = 0; | |
109 }; | |
110 | |
111 // A version of BlkClosure that is expected to be robust | |
112 // in the face of possibly uninitialized objects. | |
113 class BlkClosureCareful : public BlkClosure { | |
114 public: | |
115 size_t do_blk(HeapWord* addr) { | |
116 guarantee(false, "call do_blk_careful instead"); | |
117 return 0; | |
118 } | |
119 virtual size_t do_blk_careful(HeapWord* addr) = 0; | |
120 }; | |
121 | |
122 // SpaceClosure is used for iterating over spaces | |
123 | |
124 class Space; | |
125 class CompactibleSpace; | |
126 | |
127 class SpaceClosure : public StackObj { | |
128 public: | |
129 // Called for each space | |
130 virtual void do_space(Space* s) = 0; | |
131 }; | |
132 | |
133 class CompactibleSpaceClosure : public StackObj { | |
134 public: | |
135 // Called for each compactible space | |
136 virtual void do_space(CompactibleSpace* s) = 0; | |
137 }; | |
138 | |
139 | |
140 | |
141 // MonitorClosure is used for iterating over monitors in the monitors cache | |
142 | |
143 class ObjectMonitor; | |
144 | |
145 class MonitorClosure : public StackObj { | |
146 public: | |
147 // called for each monitor in cache | |
148 virtual void do_monitor(ObjectMonitor* m) = 0; | |
149 }; | |
150 | |
151 // A closure that is applied without any arguments. | |
152 class VoidClosure : public StackObj { | |
153 public: | |
154 // I would have liked to declare this a pure virtual, but that breaks | |
155 // in mysterious ways, for unknown reasons. | |
156 virtual void do_void(); | |
157 }; | |
158 | |
159 | |
160 // YieldClosure is intended for use by iteration loops | |
161 // to incrementalize their work, allowing interleaving | |
162 // of an interruptable task so as to allow other | |
163 // threads to run (which may not otherwise be able to access | |
164 // exclusive resources, for instance). Additionally, the | |
165 // closure also allows for aborting an ongoing iteration | |
166 // by means of checking the return value from the polling | |
167 // call. | |
168 class YieldClosure : public StackObj { | |
169 public: | |
170 virtual bool should_return() = 0; | |
171 }; | |
172 | |
173 // Abstract closure for serializing data (read or write). | |
174 | |
175 class SerializeOopClosure : public OopClosure { | |
176 public: | |
177 // Return bool indicating whether closure implements read or write. | |
178 virtual bool reading() const = 0; | |
179 | |
180 // Read/write the int pointed to by i. | |
181 virtual void do_int(int* i) = 0; | |
182 | |
183 // Read/write the size_t pointed to by i. | |
184 virtual void do_size_t(size_t* i) = 0; | |
185 | |
186 // Read/write the void pointer pointed to by p. | |
187 virtual void do_ptr(void** p) = 0; | |
188 | |
189 // Read/write the HeapWord pointer pointed to be p. | |
190 virtual void do_ptr(HeapWord** p) = 0; | |
191 | |
192 // Read/write the region specified. | |
193 virtual void do_region(u_char* start, size_t size) = 0; | |
194 | |
195 // Check/write the tag. If reading, then compare the tag against | |
196 // the passed in value and fail is they don't match. This allows | |
197 // for verification that sections of the serialized data are of the | |
198 // correct length. | |
199 virtual void do_tag(int tag) = 0; | |
200 }; |