Mercurial > hg > graal-compiler
annotate src/share/vm/oops/oop.hpp @ 17794:3514ee402842
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0 | 1 /* |
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2 * Copyright (c) 1997, 2013, 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_OOPS_OOP_HPP |
26 #define SHARE_VM_OOPS_OOP_HPP | |
27 | |
28 #include "memory/iterator.hpp" | |
29 #include "memory/memRegion.hpp" | |
30 #include "memory/specialized_oop_closures.hpp" | |
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31 #include "oops/metadata.hpp" |
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32 #include "utilities/macros.hpp" |
1972 | 33 #include "utilities/top.hpp" |
34 | |
0 | 35 // oopDesc is the top baseclass for objects classes. The {name}Desc classes describe |
36 // the format of Java objects so the fields can be accessed from C++. | |
37 // oopDesc is abstract. | |
38 // (see oopHierarchy for complete oop class hierarchy) | |
39 // | |
40 // no virtual functions allowed | |
41 | |
42 // store into oop with store check | |
1972 | 43 template <class T> void oop_store(T* p, oop v); |
44 template <class T> void oop_store(volatile T* p, oop v); | |
0 | 45 |
46 extern bool always_do_update_barrier; | |
47 | |
48 // Forward declarations. | |
49 class OopClosure; | |
50 class ScanClosure; | |
51 class FastScanClosure; | |
52 class FilteringClosure; | |
53 class BarrierSet; | |
54 class CMSIsAliveClosure; | |
55 | |
56 class PSPromotionManager; | |
57 class ParCompactionManager; | |
58 | |
59 class oopDesc { | |
60 friend class VMStructs; | |
61 private: | |
62 volatile markOop _mark; | |
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63 union _metadata { |
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64 Klass* _klass; |
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65 narrowKlass _compressed_klass; |
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66 } _metadata; |
0 | 67 |
68 // Fast access to barrier set. Must be initialized. | |
69 static BarrierSet* _bs; | |
70 | |
71 public: | |
72 markOop mark() const { return _mark; } | |
73 markOop* mark_addr() const { return (markOop*) &_mark; } | |
74 | |
75 void set_mark(volatile markOop m) { _mark = m; } | |
76 | |
77 void release_set_mark(markOop m); | |
78 markOop cas_set_mark(markOop new_mark, markOop old_mark); | |
79 | |
80 // Used only to re-initialize the mark word (e.g., of promoted | |
81 // objects during a GC) -- requires a valid klass pointer | |
82 void init_mark(); | |
83 | |
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84 Klass* klass() const; |
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85 Klass* klass_or_null() const volatile; |
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86 Klass** klass_addr(); |
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87 narrowKlass* compressed_klass_addr(); |
0 | 88 |
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89 void set_klass(Klass* k); |
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90 |
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91 // For klass field compression |
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92 int klass_gap() const; |
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93 void set_klass_gap(int z); |
0 | 94 // For when the klass pointer is being used as a linked list "next" field. |
95 void set_klass_to_list_ptr(oop k); | |
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96 oop list_ptr_from_klass(); |
0 | 97 |
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98 // size of object header, aligned to platform wordSize |
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99 static int header_size() { return sizeof(oopDesc)/HeapWordSize; } |
0 | 100 |
101 // Returns whether this is an instance of k or an instance of a subclass of k | |
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102 bool is_a(Klass* k) const; |
0 | 103 |
104 // Returns the actual oop size of the object | |
105 int size(); | |
106 | |
107 // Sometimes (for complicated concurrency-related reasons), it is useful | |
108 // to be able to figure out the size of an object knowing its klass. | |
109 int size_given_klass(Klass* klass); | |
110 | |
111 // type test operations (inlined in oop.inline.h) | |
112 bool is_instance() const; | |
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113 bool is_instanceMirror() const; |
0 | 114 bool is_instanceRef() const; |
115 bool is_array() const; | |
116 bool is_objArray() const; | |
117 bool is_typeArray() const; | |
118 | |
119 private: | |
120 // field addresses in oop | |
121 void* field_base(int offset) const; | |
122 | |
123 jbyte* byte_field_addr(int offset) const; | |
124 jchar* char_field_addr(int offset) const; | |
125 jboolean* bool_field_addr(int offset) const; | |
126 jint* int_field_addr(int offset) const; | |
127 jshort* short_field_addr(int offset) const; | |
128 jlong* long_field_addr(int offset) const; | |
129 jfloat* float_field_addr(int offset) const; | |
130 jdouble* double_field_addr(int offset) const; | |
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131 Metadata** metadata_field_addr(int offset) const; |
0 | 132 |
133 public: | |
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134 // Need this as public for garbage collection. |
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135 template <class T> T* obj_field_addr(int offset) const; |
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136 |
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137 // Needed for javaClasses |
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138 address* address_field_addr(int offset) const; |
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139 |
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140 static bool is_null(oop obj); |
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141 static bool is_null(narrowOop obj); |
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142 static bool is_null(Klass* obj); |
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143 |
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144 // Decode an oop pointer from a narrowOop if compressed. |
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145 // These are overloaded for oop and narrowOop as are the other functions |
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146 // below so that they can be called in template functions. |
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147 static oop decode_heap_oop_not_null(oop v); |
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148 static oop decode_heap_oop_not_null(narrowOop v); |
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149 static oop decode_heap_oop(oop v); |
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150 static oop decode_heap_oop(narrowOop v); |
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151 |
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152 // Encode an oop pointer to a narrow oop. The or_null versions accept |
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153 // null oop pointer, others do not in order to eliminate the |
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154 // null checking branches. |
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155 static narrowOop encode_heap_oop_not_null(oop v); |
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156 static narrowOop encode_heap_oop(oop v); |
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157 |
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158 // Load an oop out of the Java heap |
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159 static narrowOop load_heap_oop(narrowOop* p); |
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160 static oop load_heap_oop(oop* p); |
0 | 161 |
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162 // Load an oop out of Java heap and decode it to an uncompressed oop. |
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163 static oop load_decode_heap_oop_not_null(narrowOop* p); |
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164 static oop load_decode_heap_oop_not_null(oop* p); |
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165 static oop load_decode_heap_oop(narrowOop* p); |
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166 static oop load_decode_heap_oop(oop* p); |
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167 |
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168 // Store an oop into the heap. |
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169 static void store_heap_oop(narrowOop* p, narrowOop v); |
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170 static void store_heap_oop(oop* p, oop v); |
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171 |
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172 // Encode oop if UseCompressedOops and store into the heap. |
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173 static void encode_store_heap_oop_not_null(narrowOop* p, oop v); |
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174 static void encode_store_heap_oop_not_null(oop* p, oop v); |
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175 static void encode_store_heap_oop(narrowOop* p, oop v); |
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176 static void encode_store_heap_oop(oop* p, oop v); |
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177 |
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178 static void release_store_heap_oop(volatile narrowOop* p, narrowOop v); |
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179 static void release_store_heap_oop(volatile oop* p, oop v); |
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180 |
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181 static void release_encode_store_heap_oop_not_null(volatile narrowOop* p, oop v); |
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182 static void release_encode_store_heap_oop_not_null(volatile oop* p, oop v); |
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183 static void release_encode_store_heap_oop(volatile narrowOop* p, oop v); |
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184 static void release_encode_store_heap_oop(volatile oop* p, oop v); |
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185 |
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186 static oop atomic_exchange_oop(oop exchange_value, volatile HeapWord *dest); |
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187 static oop atomic_compare_exchange_oop(oop exchange_value, |
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188 volatile HeapWord *dest, |
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189 oop compare_value, |
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190 bool prebarrier = false); |
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191 |
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192 // Access to fields in a instanceOop through these methods. |
0 | 193 oop obj_field(int offset) const; |
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194 volatile oop obj_field_volatile(int offset) const; |
0 | 195 void obj_field_put(int offset, oop value); |
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196 void obj_field_put_raw(int offset, oop value); |
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197 void obj_field_put_volatile(int offset, oop value); |
0 | 198 |
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199 Metadata* metadata_field(int offset) const; |
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200 void metadata_field_put(int offset, Metadata* value); |
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201 |
0 | 202 jbyte byte_field(int offset) const; |
203 void byte_field_put(int offset, jbyte contents); | |
204 | |
205 jchar char_field(int offset) const; | |
206 void char_field_put(int offset, jchar contents); | |
207 | |
208 jboolean bool_field(int offset) const; | |
209 void bool_field_put(int offset, jboolean contents); | |
210 | |
211 jint int_field(int offset) const; | |
212 void int_field_put(int offset, jint contents); | |
213 | |
214 jshort short_field(int offset) const; | |
215 void short_field_put(int offset, jshort contents); | |
216 | |
217 jlong long_field(int offset) const; | |
218 void long_field_put(int offset, jlong contents); | |
219 | |
220 jfloat float_field(int offset) const; | |
221 void float_field_put(int offset, jfloat contents); | |
222 | |
223 jdouble double_field(int offset) const; | |
224 void double_field_put(int offset, jdouble contents); | |
225 | |
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226 address address_field(int offset) const; |
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227 void address_field_put(int offset, address contents); |
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228 |
0 | 229 oop obj_field_acquire(int offset) const; |
230 void release_obj_field_put(int offset, oop value); | |
231 | |
232 jbyte byte_field_acquire(int offset) const; | |
233 void release_byte_field_put(int offset, jbyte contents); | |
234 | |
235 jchar char_field_acquire(int offset) const; | |
236 void release_char_field_put(int offset, jchar contents); | |
237 | |
238 jboolean bool_field_acquire(int offset) const; | |
239 void release_bool_field_put(int offset, jboolean contents); | |
240 | |
241 jint int_field_acquire(int offset) const; | |
242 void release_int_field_put(int offset, jint contents); | |
243 | |
244 jshort short_field_acquire(int offset) const; | |
245 void release_short_field_put(int offset, jshort contents); | |
246 | |
247 jlong long_field_acquire(int offset) const; | |
248 void release_long_field_put(int offset, jlong contents); | |
249 | |
250 jfloat float_field_acquire(int offset) const; | |
251 void release_float_field_put(int offset, jfloat contents); | |
252 | |
253 jdouble double_field_acquire(int offset) const; | |
254 void release_double_field_put(int offset, jdouble contents); | |
255 | |
710 | 256 address address_field_acquire(int offset) const; |
257 void release_address_field_put(int offset, address contents); | |
258 | |
0 | 259 // printing functions for VM debugging |
260 void print_on(outputStream* st) const; // First level print | |
261 void print_value_on(outputStream* st) const; // Second level print. | |
262 void print_address_on(outputStream* st) const; // Address printing | |
263 | |
264 // printing on default output stream | |
265 void print(); | |
266 void print_value(); | |
267 void print_address(); | |
268 | |
269 // return the print strings | |
270 char* print_string(); | |
271 char* print_value_string(); | |
272 | |
273 // verification operations | |
274 void verify_on(outputStream* st); | |
275 void verify(); | |
276 | |
277 // locking operations | |
278 bool is_locked() const; | |
279 bool is_unlocked() const; | |
280 bool has_bias_pattern() const; | |
281 | |
282 // asserts | |
283 bool is_oop(bool ignore_mark_word = false) const; | |
284 bool is_oop_or_null(bool ignore_mark_word = false) const; | |
285 #ifndef PRODUCT | |
286 bool is_unlocked_oop() const; | |
287 #endif | |
288 | |
289 // garbage collection | |
290 bool is_gc_marked() const; | |
291 // Apply "MarkSweep::mark_and_push" to (the address of) every non-NULL | |
292 // reference field in "this". | |
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293 void follow_contents(void); |
0 | 294 |
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295 #if INCLUDE_ALL_GCS |
0 | 296 // Parallel Scavenge |
297 void push_contents(PSPromotionManager* pm); | |
298 | |
299 // Parallel Old | |
300 void update_contents(ParCompactionManager* cm); | |
301 | |
302 void follow_contents(ParCompactionManager* cm); | |
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303 #endif // INCLUDE_ALL_GCS |
0 | 304 |
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305 bool is_scavengable() const; |
0 | 306 |
307 // Forward pointer operations for scavenge | |
308 bool is_forwarded() const; | |
309 | |
310 void forward_to(oop p); | |
311 bool cas_forward_to(oop p, markOop compare); | |
312 | |
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313 #if INCLUDE_ALL_GCS |
0 | 314 // Like "forward_to", but inserts the forwarding pointer atomically. |
315 // Exactly one thread succeeds in inserting the forwarding pointer, and | |
316 // this call returns "NULL" for that thread; any other thread has the | |
317 // value of the forwarding pointer returned and does not modify "this". | |
318 oop forward_to_atomic(oop p); | |
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319 #endif // INCLUDE_ALL_GCS |
0 | 320 |
321 oop forwardee() const; | |
322 | |
323 // Age of object during scavenge | |
6818 | 324 uint age() const; |
0 | 325 void incr_age(); |
326 | |
327 // Adjust all pointers in this object to point at it's forwarded location and | |
328 // return the size of this oop. This is used by the MarkSweep collector. | |
329 int adjust_pointers(); | |
330 | |
331 // mark-sweep support | |
332 void follow_body(int begin, int end); | |
333 | |
334 // Fast access to barrier set | |
335 static BarrierSet* bs() { return _bs; } | |
336 static void set_bs(BarrierSet* bs) { _bs = bs; } | |
337 | |
338 // iterators, returns size of object | |
342
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339 #define OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ |
0 | 340 int oop_iterate(OopClosureType* blk); \ |
341 int oop_iterate(OopClosureType* blk, MemRegion mr); // Only in mr. | |
342 | |
343 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_DECL) | |
342
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344 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_DECL) |
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345 |
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346 #if INCLUDE_ALL_GCS |
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347 |
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348 #define OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
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349 int oop_iterate_backwards(OopClosureType* blk); |
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350 |
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351 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_BACKWARDS_DECL) |
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352 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_BACKWARDS_DECL) |
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353 #endif |
0 | 354 |
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355 int oop_iterate_no_header(OopClosure* bk); |
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356 int oop_iterate_no_header(OopClosure* bk, MemRegion mr); |
0 | 357 |
358 // identity hash; returns the identity hash key (computes it if necessary) | |
359 // NOTE with the introduction of UseBiasedLocking that identity_hash() might reach a | |
360 // safepoint if called on a biased object. Calling code must be aware of that. | |
361 intptr_t identity_hash(); | |
362 intptr_t slow_identity_hash(); | |
363 | |
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364 // Alternate hashing code if string table is rehashed |
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365 unsigned int new_hash(jint seed); |
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366 |
0 | 367 // marks are forwarded to stack when object is locked |
368 bool has_displaced_mark() const; | |
369 markOop displaced_mark() const; | |
370 void set_displaced_mark(markOop m); | |
371 | |
372 // for code generation | |
373 static int mark_offset_in_bytes() { return offset_of(oopDesc, _mark); } | |
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374 static int klass_offset_in_bytes() { return offset_of(oopDesc, _metadata._klass); } |
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375 static int klass_gap_offset_in_bytes(); |
0 | 376 }; |
1972 | 377 |
378 #endif // SHARE_VM_OOPS_OOP_HPP |