Mercurial > hg > graal-compiler
annotate src/share/vm/oops/oop.hpp @ 7106:4983da9d3fc7
Merge
author | Christian Wimmer <christian.wimmer@oracle.com> |
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date | Thu, 29 Nov 2012 17:43:48 -0800 |
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0 | 1 /* |
6008 | 2 * Copyright (c) 1997, 2012, 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" |
1972 | 32 #include "utilities/top.hpp" |
33 | |
0 | 34 // oopDesc is the top baseclass for objects classes. The {name}Desc classes describe |
35 // the format of Java objects so the fields can be accessed from C++. | |
36 // oopDesc is abstract. | |
37 // (see oopHierarchy for complete oop class hierarchy) | |
38 // | |
39 // no virtual functions allowed | |
40 | |
41 // store into oop with store check | |
1972 | 42 template <class T> void oop_store(T* p, oop v); |
43 template <class T> void oop_store(volatile T* p, oop v); | |
0 | 44 |
45 extern bool always_do_update_barrier; | |
46 | |
47 // Forward declarations. | |
48 class OopClosure; | |
49 class ScanClosure; | |
50 class FastScanClosure; | |
51 class FilteringClosure; | |
52 class BarrierSet; | |
53 class CMSIsAliveClosure; | |
54 | |
55 class PSPromotionManager; | |
56 class ParCompactionManager; | |
57 | |
58 class oopDesc { | |
59 friend class VMStructs; | |
60 private: | |
61 volatile markOop _mark; | |
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62 union _metadata { |
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63 Klass* _klass; |
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64 narrowOop _compressed_klass; |
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65 } _metadata; |
0 | 66 |
67 // Fast access to barrier set. Must be initialized. | |
68 static BarrierSet* _bs; | |
69 | |
70 public: | |
71 markOop mark() const { return _mark; } | |
72 markOop* mark_addr() const { return (markOop*) &_mark; } | |
73 | |
74 void set_mark(volatile markOop m) { _mark = m; } | |
75 | |
76 void release_set_mark(markOop m); | |
77 markOop cas_set_mark(markOop new_mark, markOop old_mark); | |
78 | |
79 // Used only to re-initialize the mark word (e.g., of promoted | |
80 // objects during a GC) -- requires a valid klass pointer | |
81 void init_mark(); | |
82 | |
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83 Klass* klass() const; |
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84 Klass* klass_or_null() const volatile; |
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85 Klass** klass_addr(); |
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86 narrowOop* compressed_klass_addr(); |
0 | 87 |
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88 void set_klass(Klass* k); |
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89 |
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90 // For klass field compression |
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91 int klass_gap() const; |
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92 void set_klass_gap(int z); |
0 | 93 // For when the klass pointer is being used as a linked list "next" field. |
94 void set_klass_to_list_ptr(oop k); | |
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95 oop list_ptr_from_klass(); |
0 | 96 |
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97 // size of object header, aligned to platform wordSize |
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98 static int header_size() { return sizeof(oopDesc)/HeapWordSize; } |
0 | 99 |
100 // Returns whether this is an instance of k or an instance of a subclass of k | |
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101 bool is_a(Klass* k) const; |
0 | 102 |
103 // Returns the actual oop size of the object | |
104 int size(); | |
105 | |
106 // Sometimes (for complicated concurrency-related reasons), it is useful | |
107 // to be able to figure out the size of an object knowing its klass. | |
108 int size_given_klass(Klass* klass); | |
109 | |
110 // type test operations (inlined in oop.inline.h) | |
111 bool is_instance() const; | |
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112 bool is_instanceMirror() const; |
0 | 113 bool is_instanceRef() const; |
114 bool is_array() const; | |
115 bool is_objArray() const; | |
116 bool is_typeArray() const; | |
117 | |
118 private: | |
119 // field addresses in oop | |
120 void* field_base(int offset) const; | |
121 | |
122 jbyte* byte_field_addr(int offset) const; | |
123 jchar* char_field_addr(int offset) const; | |
124 jboolean* bool_field_addr(int offset) const; | |
125 jint* int_field_addr(int offset) const; | |
126 jshort* short_field_addr(int offset) const; | |
127 jlong* long_field_addr(int offset) const; | |
128 jfloat* float_field_addr(int offset) const; | |
129 jdouble* double_field_addr(int offset) const; | |
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130 Metadata** metadata_field_addr(int offset) const; |
0 | 131 |
132 public: | |
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133 // Need this as public for garbage collection. |
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134 template <class T> T* obj_field_addr(int offset) const; |
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135 |
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136 // Needed for javaClasses |
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137 address* address_field_addr(int offset) const; |
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138 |
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139 static bool is_null(oop obj); |
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140 static bool is_null(narrowOop obj); |
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141 static bool is_null(Klass* obj); |
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142 |
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143 // Decode an oop pointer from a narrowOop if compressed. |
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144 // These are overloaded for oop and narrowOop as are the other functions |
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145 // below so that they can be called in template functions. |
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146 static oop decode_heap_oop_not_null(oop v); |
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147 static oop decode_heap_oop_not_null(narrowOop v); |
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148 static oop decode_heap_oop(oop v); |
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149 static oop decode_heap_oop(narrowOop v); |
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150 |
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151 // Encode an oop pointer to a narrow oop. The or_null versions accept |
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152 // null oop pointer, others do not in order to eliminate the |
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153 // null checking branches. |
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154 static narrowOop encode_heap_oop_not_null(oop v); |
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155 static narrowOop encode_heap_oop(oop v); |
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156 |
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157 // Load an oop out of the Java heap |
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158 static narrowOop load_heap_oop(narrowOop* p); |
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159 static oop load_heap_oop(oop* p); |
0 | 160 |
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161 // Load an oop out of Java heap and decode it to an uncompressed oop. |
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162 static oop load_decode_heap_oop_not_null(narrowOop* p); |
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163 static oop load_decode_heap_oop_not_null(oop* p); |
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164 static oop load_decode_heap_oop(narrowOop* p); |
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165 static oop load_decode_heap_oop(oop* p); |
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166 |
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167 // Store an oop into the heap. |
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168 static void store_heap_oop(narrowOop* p, narrowOop v); |
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169 static void store_heap_oop(oop* p, oop v); |
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170 |
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171 // Encode oop if UseCompressedOops and store into the heap. |
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172 static void encode_store_heap_oop_not_null(narrowOop* p, oop v); |
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173 static void encode_store_heap_oop_not_null(oop* p, oop v); |
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174 static void encode_store_heap_oop(narrowOop* p, oop v); |
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175 static void encode_store_heap_oop(oop* p, oop v); |
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176 |
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177 static void release_store_heap_oop(volatile narrowOop* p, narrowOop v); |
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178 static void release_store_heap_oop(volatile oop* p, oop v); |
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179 |
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180 static void release_encode_store_heap_oop_not_null(volatile narrowOop* p, oop v); |
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181 static void release_encode_store_heap_oop_not_null(volatile oop* p, oop v); |
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182 static void release_encode_store_heap_oop(volatile narrowOop* p, oop v); |
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183 static void release_encode_store_heap_oop(volatile oop* p, oop v); |
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184 |
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185 static oop atomic_exchange_oop(oop exchange_value, volatile HeapWord *dest); |
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186 static oop atomic_compare_exchange_oop(oop exchange_value, |
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187 volatile HeapWord *dest, |
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188 oop compare_value, |
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189 bool prebarrier = false); |
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190 |
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191 // klass encoding for klass pointer in objects. |
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192 static narrowOop encode_klass_not_null(Klass* v); |
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193 static narrowOop encode_klass(Klass* v); |
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194 |
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195 static Klass* decode_klass_not_null(narrowOop v); |
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196 static Klass* decode_klass(narrowOop v); |
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197 |
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198 // Access to fields in a instanceOop through these methods. |
0 | 199 oop obj_field(int offset) const; |
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200 volatile oop obj_field_volatile(int offset) const; |
0 | 201 void obj_field_put(int offset, oop value); |
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202 void obj_field_put_raw(int offset, oop value); |
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203 void obj_field_put_volatile(int offset, oop value); |
0 | 204 |
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205 Metadata* metadata_field(int offset) const; |
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206 void metadata_field_put(int offset, Metadata* value); |
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207 |
0 | 208 jbyte byte_field(int offset) const; |
209 void byte_field_put(int offset, jbyte contents); | |
210 | |
211 jchar char_field(int offset) const; | |
212 void char_field_put(int offset, jchar contents); | |
213 | |
214 jboolean bool_field(int offset) const; | |
215 void bool_field_put(int offset, jboolean contents); | |
216 | |
217 jint int_field(int offset) const; | |
218 void int_field_put(int offset, jint contents); | |
219 | |
220 jshort short_field(int offset) const; | |
221 void short_field_put(int offset, jshort contents); | |
222 | |
223 jlong long_field(int offset) const; | |
224 void long_field_put(int offset, jlong contents); | |
225 | |
226 jfloat float_field(int offset) const; | |
227 void float_field_put(int offset, jfloat contents); | |
228 | |
229 jdouble double_field(int offset) const; | |
230 void double_field_put(int offset, jdouble contents); | |
231 | |
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232 address address_field(int offset) const; |
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233 void address_field_put(int offset, address contents); |
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234 |
0 | 235 oop obj_field_acquire(int offset) const; |
236 void release_obj_field_put(int offset, oop value); | |
237 | |
238 jbyte byte_field_acquire(int offset) const; | |
239 void release_byte_field_put(int offset, jbyte contents); | |
240 | |
241 jchar char_field_acquire(int offset) const; | |
242 void release_char_field_put(int offset, jchar contents); | |
243 | |
244 jboolean bool_field_acquire(int offset) const; | |
245 void release_bool_field_put(int offset, jboolean contents); | |
246 | |
247 jint int_field_acquire(int offset) const; | |
248 void release_int_field_put(int offset, jint contents); | |
249 | |
250 jshort short_field_acquire(int offset) const; | |
251 void release_short_field_put(int offset, jshort contents); | |
252 | |
253 jlong long_field_acquire(int offset) const; | |
254 void release_long_field_put(int offset, jlong contents); | |
255 | |
256 jfloat float_field_acquire(int offset) const; | |
257 void release_float_field_put(int offset, jfloat contents); | |
258 | |
259 jdouble double_field_acquire(int offset) const; | |
260 void release_double_field_put(int offset, jdouble contents); | |
261 | |
710 | 262 address address_field_acquire(int offset) const; |
263 void release_address_field_put(int offset, address contents); | |
264 | |
0 | 265 // printing functions for VM debugging |
266 void print_on(outputStream* st) const; // First level print | |
267 void print_value_on(outputStream* st) const; // Second level print. | |
268 void print_address_on(outputStream* st) const; // Address printing | |
269 | |
270 // printing on default output stream | |
271 void print(); | |
272 void print_value(); | |
273 void print_address(); | |
274 | |
275 // return the print strings | |
276 char* print_string(); | |
277 char* print_value_string(); | |
278 | |
279 // verification operations | |
280 void verify_on(outputStream* st); | |
281 void verify(); | |
282 | |
283 // locking operations | |
284 bool is_locked() const; | |
285 bool is_unlocked() const; | |
286 bool has_bias_pattern() const; | |
287 | |
288 // asserts | |
289 bool is_oop(bool ignore_mark_word = false) const; | |
290 bool is_oop_or_null(bool ignore_mark_word = false) const; | |
291 #ifndef PRODUCT | |
292 bool is_unlocked_oop() const; | |
293 #endif | |
294 | |
295 // garbage collection | |
296 bool is_gc_marked() const; | |
297 // Apply "MarkSweep::mark_and_push" to (the address of) every non-NULL | |
298 // reference field in "this". | |
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299 void follow_contents(void); |
0 | 300 |
301 #ifndef SERIALGC | |
302 // Parallel Scavenge | |
303 void push_contents(PSPromotionManager* pm); | |
304 | |
305 // Parallel Old | |
306 void update_contents(ParCompactionManager* cm); | |
307 | |
308 void follow_contents(ParCompactionManager* cm); | |
309 #endif // SERIALGC | |
310 | |
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311 bool is_scavengable() const; |
0 | 312 |
313 // Forward pointer operations for scavenge | |
314 bool is_forwarded() const; | |
315 | |
316 void forward_to(oop p); | |
317 bool cas_forward_to(oop p, markOop compare); | |
318 | |
319 #ifndef SERIALGC | |
320 // Like "forward_to", but inserts the forwarding pointer atomically. | |
321 // Exactly one thread succeeds in inserting the forwarding pointer, and | |
322 // this call returns "NULL" for that thread; any other thread has the | |
323 // value of the forwarding pointer returned and does not modify "this". | |
324 oop forward_to_atomic(oop p); | |
325 #endif // SERIALGC | |
326 | |
327 oop forwardee() const; | |
328 | |
329 // Age of object during scavenge | |
6818 | 330 uint age() const; |
0 | 331 void incr_age(); |
332 | |
333 // Adjust all pointers in this object to point at it's forwarded location and | |
334 // return the size of this oop. This is used by the MarkSweep collector. | |
335 int adjust_pointers(); | |
336 | |
337 #ifndef SERIALGC | |
338 // Parallel old | |
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339 void update_header(ParCompactionManager* cm); |
0 | 340 #endif // SERIALGC |
341 | |
342 // mark-sweep support | |
343 void follow_body(int begin, int end); | |
344 | |
345 // Fast access to barrier set | |
346 static BarrierSet* bs() { return _bs; } | |
347 static void set_bs(BarrierSet* bs) { _bs = bs; } | |
348 | |
349 // iterators, returns size of object | |
342
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350 #define OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ |
0 | 351 int oop_iterate(OopClosureType* blk); \ |
352 int oop_iterate(OopClosureType* blk, MemRegion mr); // Only in mr. | |
353 | |
354 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_DECL) | |
342
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355 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_DECL) |
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356 |
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357 #ifndef SERIALGC |
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358 |
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359 #define OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
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360 int oop_iterate_backwards(OopClosureType* blk); |
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361 |
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362 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_BACKWARDS_DECL) |
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363 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_BACKWARDS_DECL) |
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364 #endif |
0 | 365 |
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366 int oop_iterate_no_header(OopClosure* bk); |
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367 int oop_iterate_no_header(OopClosure* bk, MemRegion mr); |
0 | 368 |
369 // identity hash; returns the identity hash key (computes it if necessary) | |
370 // NOTE with the introduction of UseBiasedLocking that identity_hash() might reach a | |
371 // safepoint if called on a biased object. Calling code must be aware of that. | |
372 intptr_t identity_hash(); | |
373 intptr_t slow_identity_hash(); | |
374 | |
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375 // Alternate hashing code if string table is rehashed |
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376 unsigned int new_hash(jint seed); |
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377 |
0 | 378 // marks are forwarded to stack when object is locked |
379 bool has_displaced_mark() const; | |
380 markOop displaced_mark() const; | |
381 void set_displaced_mark(markOop m); | |
382 | |
383 // for code generation | |
384 static int mark_offset_in_bytes() { return offset_of(oopDesc, _mark); } | |
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385 static int klass_offset_in_bytes() { return offset_of(oopDesc, _metadata._klass); } |
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386 static int klass_gap_offset_in_bytes(); |
0 | 387 }; |
1972 | 388 |
389 #endif // SHARE_VM_OOPS_OOP_HPP |