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annotate src/share/vm/memory/compactingPermGenGen.hpp @ 2004:4da76e32c0be
7002666: eclipse CDT projects crash with compressed oops
Reviewed-by: kvn, twisti
author | never |
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date | Wed, 01 Dec 2010 10:16:31 -0800 |
parents | f95d63e2154a |
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0 | 1 /* |
1972 | 2 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. 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 * | |
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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 #ifndef SHARE_VM_MEMORY_COMPACTINGPERMGENGEN_HPP |
26 #define SHARE_VM_MEMORY_COMPACTINGPERMGENGEN_HPP | |
27 | |
28 #include "gc_implementation/shared/generationCounters.hpp" | |
29 #include "memory/space.hpp" | |
30 | |
0 | 31 // All heaps contains a "permanent generation," containing permanent |
32 // (reflective) objects. This is like a regular generation in some ways, | |
33 // but unlike one in others, and so is split apart. | |
34 | |
35 class PermanentGenerationSpec; | |
36 | |
37 // This is the "generation" view of a CompactingPermGen. | |
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38 // NOTE: the shared spaces used for CDS are here handled in |
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39 // a somewhat awkward and potentially buggy fashion, see CR 6801625. |
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40 // This infelicity should be fixed, see CR 6897789. |
0 | 41 class CompactingPermGenGen: public OneContigSpaceCardGeneration { |
42 friend class VMStructs; | |
43 // Abstractly, this is a subtype that gets access to protected fields. | |
44 friend class CompactingPermGen; | |
45 | |
46 private: | |
47 // Shared spaces | |
48 PermanentGenerationSpec* _spec; | |
49 size_t _shared_space_size; | |
50 VirtualSpace _ro_vs; | |
51 VirtualSpace _rw_vs; | |
52 VirtualSpace _md_vs; | |
53 VirtualSpace _mc_vs; | |
54 BlockOffsetSharedArray* _ro_bts; | |
55 BlockOffsetSharedArray* _rw_bts; | |
56 OffsetTableContigSpace* _ro_space; | |
57 OffsetTableContigSpace* _rw_space; | |
58 | |
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59 // With shared spaces there is a dichotomy in the use of the |
0 | 60 // _virtual_space of the generation. There is a portion of the |
61 // _virtual_space that is used for the unshared part of the | |
62 // permanent generation and a portion that is reserved for the shared part. | |
63 // The _reserved field in the generation represents both the | |
64 // unshared and shared parts of the generation. The _reserved | |
65 // variable is initialized for only the unshared part but is | |
66 // later extended to include the shared part during initialization | |
67 // if shared spaces are being used. | |
68 // The reserved size for the _virtual_space for CompactingPermGenGen | |
69 // is the size of the space for the permanent generation including the | |
70 // the shared spaces. This can be seen by the use of MaxPermSize | |
71 // in the allocation of PermanentGenerationSpec. The space for the | |
72 // shared spaces is committed separately (???). | |
73 // In general at initialization only a part of the | |
74 // space for the unshared part of the permanent generation is | |
75 // committed and more is committed as the permanent generation is | |
76 // grown. In growing the permanent generation the capacity() and | |
77 // max_capacity() of the generation are used. For the permanent | |
78 // generation (implemented with a CompactingPermGenGen) the capacity() | |
79 // is taken from the capacity of the space (_the_space variable used for the | |
80 // unshared part of the generation) and the max_capacity() is based | |
81 // on the size of the _reserved variable (which includes the size of the | |
82 // shared spaces) minus the size of the shared spaces. | |
83 | |
84 // These values are redundant, but are called out separately to avoid | |
85 // going through heap/space/gen pointers for performance. | |
86 static HeapWord* unshared_bottom; | |
87 static HeapWord* unshared_end; | |
88 static HeapWord* shared_bottom; | |
89 static HeapWord* readonly_bottom; | |
90 static HeapWord* readonly_end; | |
91 static HeapWord* readwrite_bottom; | |
92 static HeapWord* readwrite_end; | |
93 static HeapWord* miscdata_bottom; | |
94 static HeapWord* miscdata_end; | |
95 static HeapWord* misccode_bottom; | |
96 static HeapWord* misccode_end; | |
97 static HeapWord* shared_end; | |
98 | |
99 // List of klassOops whose vtbl entries are used to patch others. | |
100 static void** _vtbl_list; | |
101 | |
102 // Performance Counters | |
103 GenerationCounters* _gen_counters; | |
104 CSpaceCounters* _space_counters; | |
105 | |
106 void initialize_performance_counters(); | |
107 | |
108 public: | |
109 | |
110 enum { | |
111 vtbl_list_size = 16, // number of entries in the shared space vtable list. | |
408 | 112 num_virtuals = 200 // number of virtual methods in Klass (or |
0 | 113 // subclass) objects, or greater. |
114 }; | |
115 | |
116 enum { | |
117 ro = 0, // read-only shared space in the heap | |
118 rw = 1, // read-write shared space in the heap | |
119 md = 2, // miscellaneous data for initializing tables, etc. | |
120 mc = 3, // miscellaneous code - vtable replacement. | |
121 n_regions = 4 | |
122 }; | |
123 | |
124 CompactingPermGenGen(ReservedSpace rs, ReservedSpace shared_rs, | |
125 size_t initial_byte_size, int level, GenRemSet* remset, | |
126 ContiguousSpace* space, | |
127 PermanentGenerationSpec* perm_spec); | |
128 | |
129 const char* name() const { | |
130 return "compacting perm gen"; | |
131 } | |
132 | |
133 const char* short_name() const { | |
134 return "Perm"; | |
135 } | |
136 | |
137 // Return the maximum capacity for the object space. This | |
138 // explicitly does not include the shared spaces. | |
139 size_t max_capacity() const; | |
140 | |
141 void update_counters(); | |
142 | |
143 void compute_new_size() { | |
144 assert(false, "Should not call this -- handled at PermGen level."); | |
145 } | |
146 | |
147 bool must_be_youngest() const { return false; } | |
148 bool must_be_oldest() const { return false; } | |
149 | |
150 OffsetTableContigSpace* ro_space() const { return _ro_space; } | |
151 OffsetTableContigSpace* rw_space() const { return _rw_space; } | |
152 VirtualSpace* md_space() { return &_md_vs; } | |
153 VirtualSpace* mc_space() { return &_mc_vs; } | |
154 ContiguousSpace* unshared_space() const { return _the_space; } | |
155 | |
156 static bool inline is_shared(const oopDesc* p) { | |
157 return (HeapWord*)p >= shared_bottom && (HeapWord*)p < shared_end; | |
158 } | |
159 // RedefineClasses note: this tester is used to check residence of | |
160 // the specified oop in the shared readonly space and not whether | |
161 // the oop is readonly. | |
162 static bool inline is_shared_readonly(const oopDesc* p) { | |
163 return (HeapWord*)p >= readonly_bottom && (HeapWord*)p < readonly_end; | |
164 } | |
165 // RedefineClasses note: this tester is used to check residence of | |
166 // the specified oop in the shared readwrite space and not whether | |
167 // the oop is readwrite. | |
168 static bool inline is_shared_readwrite(const oopDesc* p) { | |
169 return (HeapWord*)p >= readwrite_bottom && (HeapWord*)p < readwrite_end; | |
170 } | |
171 | |
172 bool is_in_unshared(const void* p) const { | |
173 return OneContigSpaceCardGeneration::is_in(p); | |
174 } | |
175 | |
176 bool is_in_shared(const void* p) const { | |
177 return p >= shared_bottom && p < shared_end; | |
178 } | |
179 | |
180 inline bool is_in(const void* p) const { | |
181 return is_in_unshared(p) || is_in_shared(p); | |
182 } | |
183 | |
184 inline PermanentGenerationSpec* spec() const { return _spec; } | |
185 inline void set_spec(PermanentGenerationSpec* spec) { _spec = spec; } | |
186 | |
187 void pre_adjust_pointers(); | |
188 void adjust_pointers(); | |
189 void space_iterate(SpaceClosure* blk, bool usedOnly = false); | |
190 void print_on(outputStream* st) const; | |
191 void younger_refs_iterate(OopsInGenClosure* blk); | |
192 void compact(); | |
193 void post_compact(); | |
194 size_t contiguous_available() const; | |
195 | |
196 void clear_remembered_set(); | |
197 void invalidate_remembered_set(); | |
198 | |
199 inline bool block_is_obj(const HeapWord* addr) const { | |
200 if (addr < the_space()->top()) return true; | |
201 else if (addr < the_space()->end()) return false; | |
202 else if (addr < ro_space()->top()) return true; | |
203 else if (addr < ro_space()->end()) return false; | |
204 else if (addr < rw_space()->top()) return true; | |
205 else return false; | |
206 } | |
207 | |
208 | |
209 inline size_t block_size(const HeapWord* addr) const { | |
210 if (addr < the_space()->top()) { | |
211 return oop(addr)->size(); | |
212 } | |
213 else if (addr < the_space()->end()) { | |
214 assert(addr == the_space()->top(), "non-block head arg to block_size"); | |
215 return the_space()->end() - the_space()->top(); | |
216 } | |
217 | |
218 else if (addr < ro_space()->top()) { | |
219 return oop(addr)->size(); | |
220 } | |
221 else if (addr < ro_space()->end()) { | |
222 assert(addr == ro_space()->top(), "non-block head arg to block_size"); | |
223 return ro_space()->end() - ro_space()->top(); | |
224 } | |
225 | |
226 else if (addr < rw_space()->top()) { | |
227 return oop(addr)->size(); | |
228 } | |
229 else { | |
230 assert(addr == rw_space()->top(), "non-block head arg to block_size"); | |
231 return rw_space()->end() - rw_space()->top(); | |
232 } | |
233 } | |
234 | |
235 static void generate_vtable_methods(void** vtbl_list, | |
236 void** vtable, | |
237 char** md_top, char* md_end, | |
238 char** mc_top, char* mc_end); | |
239 | |
240 void verify(bool allow_dirty); | |
241 | |
242 // Serialization | |
243 static void initialize_oops() KERNEL_RETURN; | |
244 static void serialize_oops(SerializeOopClosure* soc); | |
245 void serialize_bts(SerializeOopClosure* soc); | |
246 | |
247 // Initiate dumping of shared file. | |
248 static jint dump_shared(GrowableArray<oop>* class_promote_order, TRAPS); | |
249 | |
250 // JVM/TI RedefineClasses() support: | |
251 // Remap the shared readonly space to shared readwrite, private if | |
252 // sharing is enabled. Simply returns true if sharing is not enabled | |
253 // or if the remapping has already been done by a prior call. | |
254 static bool remap_shared_readonly_as_readwrite(); | |
255 }; | |
1972 | 256 |
257 #endif // SHARE_VM_MEMORY_COMPACTINGPERMGENGEN_HPP |