Mercurial > hg > truffle
annotate src/share/vm/oops/oop.hpp @ 342:37f87013dfd8
6711316: Open source the Garbage-First garbage collector
Summary: First mercurial integration of the code for the Garbage-First garbage collector.
Reviewed-by: apetrusenko, iveresov, jmasa, sgoldman, tonyp, ysr
author | ysr |
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date | Thu, 05 Jun 2008 15:57:56 -0700 |
parents | b7268662a986 |
children | 6aae2f9d0294 |
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0 | 1 /* |
2 * Copyright 1997-2007 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 // oopDesc is the top baseclass for objects classes. The {name}Desc classes describe | |
26 // the format of Java objects so the fields can be accessed from C++. | |
27 // oopDesc is abstract. | |
28 // (see oopHierarchy for complete oop class hierarchy) | |
29 // | |
30 // no virtual functions allowed | |
31 | |
32 // store into oop with store check | |
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33 template <class T> void oop_store(T* p, oop v); |
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34 template <class T> void oop_store(volatile T* p, oop v); |
0 | 35 |
36 // store into oop without store check | |
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37 template <class T> void oop_store_without_check(T* p, oop v); |
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38 template <class T> void oop_store_without_check(volatile T* p, oop v); |
0 | 39 |
40 | |
41 extern bool always_do_update_barrier; | |
42 | |
43 // Forward declarations. | |
44 class OopClosure; | |
45 class ScanClosure; | |
46 class FastScanClosure; | |
47 class FilteringClosure; | |
48 class BarrierSet; | |
49 class CMSIsAliveClosure; | |
50 | |
51 class PSPromotionManager; | |
52 class ParCompactionManager; | |
53 | |
54 class oopDesc { | |
55 friend class VMStructs; | |
56 private: | |
57 volatile markOop _mark; | |
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58 union _metadata { |
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59 wideKlassOop _klass; |
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60 narrowOop _compressed_klass; |
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61 } _metadata; |
0 | 62 |
63 // Fast access to barrier set. Must be initialized. | |
64 static BarrierSet* _bs; | |
65 | |
66 public: | |
67 markOop mark() const { return _mark; } | |
68 markOop* mark_addr() const { return (markOop*) &_mark; } | |
69 | |
70 void set_mark(volatile markOop m) { _mark = m; } | |
71 | |
72 void release_set_mark(markOop m); | |
73 markOop cas_set_mark(markOop new_mark, markOop old_mark); | |
74 | |
75 // Used only to re-initialize the mark word (e.g., of promoted | |
76 // objects during a GC) -- requires a valid klass pointer | |
77 void init_mark(); | |
78 | |
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79 klassOop klass() const; |
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80 oop* klass_addr(); |
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81 narrowOop* compressed_klass_addr(); |
0 | 82 |
83 void set_klass(klassOop k); | |
84 // For when the klass pointer is being used as a linked list "next" field. | |
85 void set_klass_to_list_ptr(oop k); | |
86 | |
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87 // size of object header, aligned to platform wordSize |
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88 static int header_size() { return sizeof(oopDesc)/HeapWordSize; } |
0 | 89 |
90 Klass* blueprint() const; | |
91 | |
92 // Returns whether this is an instance of k or an instance of a subclass of k | |
93 bool is_a(klassOop k) const; | |
94 | |
95 // Returns the actual oop size of the object | |
96 int size(); | |
97 | |
98 // Sometimes (for complicated concurrency-related reasons), it is useful | |
99 // to be able to figure out the size of an object knowing its klass. | |
100 int size_given_klass(Klass* klass); | |
101 | |
102 // Some perm gen objects are not parseble immediately after | |
103 // installation of their klass pointer. | |
104 bool is_parsable(); | |
105 | |
106 // type test operations (inlined in oop.inline.h) | |
107 bool is_instance() const; | |
108 bool is_instanceRef() const; | |
109 bool is_array() const; | |
110 bool is_objArray() const; | |
111 bool is_symbol() const; | |
112 bool is_klass() const; | |
113 bool is_thread() const; | |
114 bool is_method() const; | |
115 bool is_constMethod() const; | |
116 bool is_methodData() const; | |
117 bool is_constantPool() const; | |
118 bool is_constantPoolCache() const; | |
119 bool is_typeArray() const; | |
120 bool is_javaArray() const; | |
121 bool is_compiledICHolder() const; | |
122 | |
123 private: | |
124 // field addresses in oop | |
125 void* field_base(int offset) const; | |
126 | |
127 jbyte* byte_field_addr(int offset) const; | |
128 jchar* char_field_addr(int offset) const; | |
129 jboolean* bool_field_addr(int offset) const; | |
130 jint* int_field_addr(int offset) const; | |
131 jshort* short_field_addr(int offset) const; | |
132 jlong* long_field_addr(int offset) const; | |
133 jfloat* float_field_addr(int offset) const; | |
134 jdouble* double_field_addr(int offset) const; | |
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135 address* address_field_addr(int offset) const; |
0 | 136 |
137 public: | |
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138 // Need this as public for garbage collection. |
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139 template <class T> T* obj_field_addr(int offset) const; |
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140 |
135
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141 // Oop encoding heap max |
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142 static const uint64_t OopEncodingHeapMax = |
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143 (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; |
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144 |
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145 static bool is_null(oop obj); |
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146 static bool is_null(narrowOop obj); |
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147 |
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148 // Decode an oop pointer from a narrowOop if compressed. |
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149 // These are overloaded for oop and narrowOop as are the other functions |
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150 // below so that they can be called in template functions. |
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151 static oop decode_heap_oop_not_null(oop v); |
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152 static oop decode_heap_oop_not_null(narrowOop v); |
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153 static oop decode_heap_oop(oop v); |
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154 static oop decode_heap_oop(narrowOop v); |
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155 |
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156 // Encode an oop pointer to a narrow oop. The or_null versions accept |
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157 // null oop pointer, others do not in order to eliminate the |
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158 // null checking branches. |
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159 static narrowOop encode_heap_oop_not_null(oop v); |
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160 static narrowOop encode_heap_oop(oop v); |
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161 |
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162 // Load an oop out of the Java heap |
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163 static narrowOop load_heap_oop(narrowOop* p); |
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164 static oop load_heap_oop(oop* p); |
0 | 165 |
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166 // Load an oop out of Java heap and decode it to an uncompressed oop. |
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167 static oop load_decode_heap_oop_not_null(narrowOop* p); |
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168 static oop load_decode_heap_oop_not_null(oop* p); |
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169 static oop load_decode_heap_oop(narrowOop* p); |
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170 static oop load_decode_heap_oop(oop* p); |
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171 |
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172 // Store an oop into the heap. |
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173 static void store_heap_oop(narrowOop* p, narrowOop v); |
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174 static void store_heap_oop(oop* p, oop v); |
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175 |
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176 // Encode oop if UseCompressedOops and store into the heap. |
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177 static void encode_store_heap_oop_not_null(narrowOop* p, oop v); |
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178 static void encode_store_heap_oop_not_null(oop* p, oop v); |
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179 static void encode_store_heap_oop(narrowOop* p, oop v); |
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180 static void encode_store_heap_oop(oop* p, oop v); |
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181 |
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182 static void release_store_heap_oop(volatile narrowOop* p, narrowOop v); |
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183 static void release_store_heap_oop(volatile oop* p, oop v); |
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184 |
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185 static void release_encode_store_heap_oop_not_null(volatile narrowOop* p, oop v); |
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186 static void release_encode_store_heap_oop_not_null(volatile oop* p, oop v); |
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187 static void release_encode_store_heap_oop(volatile narrowOop* p, oop v); |
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188 static void release_encode_store_heap_oop(volatile oop* p, oop v); |
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189 |
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190 static oop atomic_exchange_oop(oop exchange_value, volatile HeapWord *dest); |
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191 static oop atomic_compare_exchange_oop(oop exchange_value, |
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192 volatile HeapWord *dest, |
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193 oop compare_value); |
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194 |
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195 // Access to fields in a instanceOop through these methods. |
0 | 196 oop obj_field(int offset) const; |
197 void obj_field_put(int offset, oop value); | |
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198 void obj_field_raw_put(int offset, oop value); |
0 | 199 |
200 jbyte byte_field(int offset) const; | |
201 void byte_field_put(int offset, jbyte contents); | |
202 | |
203 jchar char_field(int offset) const; | |
204 void char_field_put(int offset, jchar contents); | |
205 | |
206 jboolean bool_field(int offset) const; | |
207 void bool_field_put(int offset, jboolean contents); | |
208 | |
209 jint int_field(int offset) const; | |
210 void int_field_put(int offset, jint contents); | |
211 | |
212 jshort short_field(int offset) const; | |
213 void short_field_put(int offset, jshort contents); | |
214 | |
215 jlong long_field(int offset) const; | |
216 void long_field_put(int offset, jlong contents); | |
217 | |
218 jfloat float_field(int offset) const; | |
219 void float_field_put(int offset, jfloat contents); | |
220 | |
221 jdouble double_field(int offset) const; | |
222 void double_field_put(int offset, jdouble contents); | |
223 | |
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224 address address_field(int offset) const; |
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225 void address_field_put(int offset, address contents); |
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226 |
0 | 227 oop obj_field_acquire(int offset) const; |
228 void release_obj_field_put(int offset, oop value); | |
229 | |
230 jbyte byte_field_acquire(int offset) const; | |
231 void release_byte_field_put(int offset, jbyte contents); | |
232 | |
233 jchar char_field_acquire(int offset) const; | |
234 void release_char_field_put(int offset, jchar contents); | |
235 | |
236 jboolean bool_field_acquire(int offset) const; | |
237 void release_bool_field_put(int offset, jboolean contents); | |
238 | |
239 jint int_field_acquire(int offset) const; | |
240 void release_int_field_put(int offset, jint contents); | |
241 | |
242 jshort short_field_acquire(int offset) const; | |
243 void release_short_field_put(int offset, jshort contents); | |
244 | |
245 jlong long_field_acquire(int offset) const; | |
246 void release_long_field_put(int offset, jlong contents); | |
247 | |
248 jfloat float_field_acquire(int offset) const; | |
249 void release_float_field_put(int offset, jfloat contents); | |
250 | |
251 jdouble double_field_acquire(int offset) const; | |
252 void release_double_field_put(int offset, jdouble contents); | |
253 | |
254 // printing functions for VM debugging | |
255 void print_on(outputStream* st) const; // First level print | |
256 void print_value_on(outputStream* st) const; // Second level print. | |
257 void print_address_on(outputStream* st) const; // Address printing | |
258 | |
259 // printing on default output stream | |
260 void print(); | |
261 void print_value(); | |
262 void print_address(); | |
263 | |
264 // return the print strings | |
265 char* print_string(); | |
266 char* print_value_string(); | |
267 | |
268 // verification operations | |
269 void verify_on(outputStream* st); | |
270 void verify(); | |
271 void verify_old_oop(oop* p, bool allow_dirty); | |
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272 void verify_old_oop(narrowOop* p, bool allow_dirty); |
0 | 273 |
274 // tells whether this oop is partially constructed (gc during class loading) | |
275 bool partially_loaded(); | |
276 void set_partially_loaded(); | |
277 | |
278 // locking operations | |
279 bool is_locked() const; | |
280 bool is_unlocked() const; | |
281 bool has_bias_pattern() const; | |
282 | |
283 // asserts | |
284 bool is_oop(bool ignore_mark_word = false) const; | |
285 bool is_oop_or_null(bool ignore_mark_word = false) const; | |
286 #ifndef PRODUCT | |
287 bool is_unlocked_oop() const; | |
288 #endif | |
289 | |
290 // garbage collection | |
291 bool is_gc_marked() const; | |
292 // Apply "MarkSweep::mark_and_push" to (the address of) every non-NULL | |
293 // reference field in "this". | |
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294 void follow_contents(void); |
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295 void follow_header(void); |
0 | 296 |
297 #ifndef SERIALGC | |
298 // Parallel Scavenge | |
299 void copy_contents(PSPromotionManager* pm); | |
300 void push_contents(PSPromotionManager* pm); | |
301 | |
302 // Parallel Old | |
303 void update_contents(ParCompactionManager* cm); | |
304 void update_contents(ParCompactionManager* cm, | |
305 HeapWord* begin_limit, | |
306 HeapWord* end_limit); | |
307 void update_contents(ParCompactionManager* cm, | |
308 klassOop old_klass, | |
309 HeapWord* begin_limit, | |
310 HeapWord* end_limit); | |
311 | |
312 void follow_contents(ParCompactionManager* cm); | |
313 void follow_header(ParCompactionManager* cm); | |
314 #endif // SERIALGC | |
315 | |
316 bool is_perm() const; | |
317 bool is_perm_or_null() const; | |
318 bool is_shared() const; | |
319 bool is_shared_readonly() const; | |
320 bool is_shared_readwrite() const; | |
321 | |
322 // Forward pointer operations for scavenge | |
323 bool is_forwarded() const; | |
324 | |
325 void forward_to(oop p); | |
326 bool cas_forward_to(oop p, markOop compare); | |
327 | |
328 #ifndef SERIALGC | |
329 // Like "forward_to", but inserts the forwarding pointer atomically. | |
330 // Exactly one thread succeeds in inserting the forwarding pointer, and | |
331 // this call returns "NULL" for that thread; any other thread has the | |
332 // value of the forwarding pointer returned and does not modify "this". | |
333 oop forward_to_atomic(oop p); | |
334 #endif // SERIALGC | |
335 | |
336 oop forwardee() const; | |
337 | |
338 // Age of object during scavenge | |
339 int age() const; | |
340 void incr_age(); | |
341 | |
342 // Adjust all pointers in this object to point at it's forwarded location and | |
343 // return the size of this oop. This is used by the MarkSweep collector. | |
344 int adjust_pointers(); | |
345 void adjust_header(); | |
346 | |
347 #ifndef SERIALGC | |
348 // Parallel old | |
349 void update_header(); | |
350 void update_header(HeapWord* beg_addr, HeapWord* end_addr); | |
351 #endif // SERIALGC | |
352 | |
353 // mark-sweep support | |
354 void follow_body(int begin, int end); | |
355 | |
356 // Fast access to barrier set | |
357 static BarrierSet* bs() { return _bs; } | |
358 static void set_bs(BarrierSet* bs) { _bs = bs; } | |
359 | |
360 // iterators, returns size of object | |
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361 #define OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ |
0 | 362 int oop_iterate(OopClosureType* blk); \ |
363 int oop_iterate(OopClosureType* blk, MemRegion mr); // Only in mr. | |
364 | |
365 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_DECL) | |
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366 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_DECL) |
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367 |
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368 #ifndef SERIALGC |
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369 |
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370 #define OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
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371 int oop_iterate_backwards(OopClosureType* blk); |
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372 |
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373 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_BACKWARDS_DECL) |
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374 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_BACKWARDS_DECL) |
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375 #endif |
0 | 376 |
377 void oop_iterate_header(OopClosure* blk); | |
378 void oop_iterate_header(OopClosure* blk, MemRegion mr); | |
379 | |
380 // identity hash; returns the identity hash key (computes it if necessary) | |
381 // NOTE with the introduction of UseBiasedLocking that identity_hash() might reach a | |
382 // safepoint if called on a biased object. Calling code must be aware of that. | |
383 intptr_t identity_hash(); | |
384 intptr_t slow_identity_hash(); | |
385 | |
386 // marks are forwarded to stack when object is locked | |
387 bool has_displaced_mark() const; | |
388 markOop displaced_mark() const; | |
389 void set_displaced_mark(markOop m); | |
390 | |
391 // for code generation | |
392 static int mark_offset_in_bytes() { return offset_of(oopDesc, _mark); } | |
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393 static int klass_offset_in_bytes() { return offset_of(oopDesc, _metadata._klass); } |
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394 static int klass_gap_offset_in_bytes(); |
0 | 395 }; |