Mercurial > hg > truffle
annotate src/share/vm/oops/oop.hpp @ 3377:2aa9ddbb9e60
7041789: 30% perf regression with c2/arm following 7017732
Summary: Implement a more accurate is_scavengable()
Reviewed-by: stefank, jcoomes, ysr
author | jmasa |
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date | Tue, 03 May 2011 10:30:34 -0700 |
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0 | 1 /* |
2227 | 2 * Copyright (c) 1997, 2011, 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" | |
31 #include "utilities/top.hpp" | |
32 | |
0 | 33 // oopDesc is the top baseclass for objects classes. The {name}Desc classes describe |
34 // the format of Java objects so the fields can be accessed from C++. | |
35 // oopDesc is abstract. | |
36 // (see oopHierarchy for complete oop class hierarchy) | |
37 // | |
38 // no virtual functions allowed | |
39 | |
40 // store into oop with store check | |
1972 | 41 template <class T> void oop_store(T* p, oop v); |
42 template <class T> void oop_store(volatile T* p, oop v); | |
0 | 43 |
44 // store into oop without store check | |
1972 | 45 template <class T> void oop_store_without_check(T* p, oop v); |
46 template <class T> void oop_store_without_check(volatile T* p, oop v); | |
0 | 47 |
48 extern bool always_do_update_barrier; | |
49 | |
50 // Forward declarations. | |
51 class OopClosure; | |
52 class ScanClosure; | |
53 class FastScanClosure; | |
54 class FilteringClosure; | |
55 class BarrierSet; | |
56 class CMSIsAliveClosure; | |
57 | |
58 class PSPromotionManager; | |
59 class ParCompactionManager; | |
60 | |
61 class oopDesc { | |
62 friend class VMStructs; | |
63 private: | |
64 volatile markOop _mark; | |
113
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65 union _metadata { |
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66 wideKlassOop _klass; |
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67 narrowOop _compressed_klass; |
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68 } _metadata; |
0 | 69 |
70 // Fast access to barrier set. Must be initialized. | |
71 static BarrierSet* _bs; | |
72 | |
73 public: | |
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74 enum ConcSafeType { |
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75 IsUnsafeConc = false, |
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76 IsSafeConc = true |
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77 }; |
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78 |
0 | 79 markOop mark() const { return _mark; } |
80 markOop* mark_addr() const { return (markOop*) &_mark; } | |
81 | |
82 void set_mark(volatile markOop m) { _mark = m; } | |
83 | |
84 void release_set_mark(markOop m); | |
85 markOop cas_set_mark(markOop new_mark, markOop old_mark); | |
86 | |
87 // Used only to re-initialize the mark word (e.g., of promoted | |
88 // objects during a GC) -- requires a valid klass pointer | |
89 void init_mark(); | |
90 | |
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91 klassOop klass() const; |
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92 klassOop klass_or_null() const volatile; |
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93 oop* klass_addr(); |
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94 narrowOop* compressed_klass_addr(); |
0 | 95 |
96 void set_klass(klassOop k); | |
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97 |
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98 // For klass field compression |
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99 int klass_gap() const; |
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100 void set_klass_gap(int z); |
0 | 101 // For when the klass pointer is being used as a linked list "next" field. |
102 void set_klass_to_list_ptr(oop k); | |
103 | |
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104 // size of object header, aligned to platform wordSize |
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105 static int header_size() { return sizeof(oopDesc)/HeapWordSize; } |
0 | 106 |
107 Klass* blueprint() const; | |
108 | |
109 // Returns whether this is an instance of k or an instance of a subclass of k | |
110 bool is_a(klassOop k) const; | |
111 | |
112 // Returns the actual oop size of the object | |
113 int size(); | |
114 | |
115 // Sometimes (for complicated concurrency-related reasons), it is useful | |
116 // to be able to figure out the size of an object knowing its klass. | |
117 int size_given_klass(Klass* klass); | |
118 | |
119 // Some perm gen objects are not parseble immediately after | |
120 // installation of their klass pointer. | |
121 bool is_parsable(); | |
122 | |
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123 // Some perm gen objects that have been allocated and initialized |
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124 // can be changed by the VM when not at a safe point (class rededfinition |
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125 // is an example). Such objects should not be examined by the |
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126 // concurrent processing of a garbage collector if is_conc_safe() |
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127 // returns false. |
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128 bool is_conc_safe(); |
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129 |
0 | 130 // type test operations (inlined in oop.inline.h) |
131 bool is_instance() const; | |
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132 bool is_instanceMirror() const; |
0 | 133 bool is_instanceRef() const; |
134 bool is_array() const; | |
135 bool is_objArray() const; | |
136 bool is_klass() const; | |
137 bool is_thread() const; | |
138 bool is_method() const; | |
139 bool is_constMethod() const; | |
140 bool is_methodData() const; | |
141 bool is_constantPool() const; | |
142 bool is_constantPoolCache() const; | |
143 bool is_typeArray() const; | |
144 bool is_javaArray() const; | |
145 bool is_compiledICHolder() const; | |
146 | |
147 private: | |
148 // field addresses in oop | |
149 void* field_base(int offset) const; | |
150 | |
151 jbyte* byte_field_addr(int offset) const; | |
152 jchar* char_field_addr(int offset) const; | |
153 jboolean* bool_field_addr(int offset) const; | |
154 jint* int_field_addr(int offset) const; | |
155 jshort* short_field_addr(int offset) const; | |
156 jlong* long_field_addr(int offset) const; | |
157 jfloat* float_field_addr(int offset) const; | |
158 jdouble* double_field_addr(int offset) const; | |
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159 address* address_field_addr(int offset) const; |
0 | 160 |
161 public: | |
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162 // Need this as public for garbage collection. |
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163 template <class T> T* obj_field_addr(int offset) const; |
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164 |
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165 static bool is_null(oop obj); |
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166 static bool is_null(narrowOop obj); |
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167 |
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168 // Decode an oop pointer from a narrowOop if compressed. |
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169 // These are overloaded for oop and narrowOop as are the other functions |
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170 // below so that they can be called in template functions. |
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171 static oop decode_heap_oop_not_null(oop v); |
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172 static oop decode_heap_oop_not_null(narrowOop v); |
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173 static oop decode_heap_oop(oop v); |
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174 static oop decode_heap_oop(narrowOop v); |
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175 |
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176 // Encode an oop pointer to a narrow oop. The or_null versions accept |
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177 // null oop pointer, others do not in order to eliminate the |
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178 // null checking branches. |
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179 static narrowOop encode_heap_oop_not_null(oop v); |
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180 static narrowOop encode_heap_oop(oop v); |
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181 |
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182 // Load an oop out of the Java heap |
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183 static narrowOop load_heap_oop(narrowOop* p); |
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184 static oop load_heap_oop(oop* p); |
0 | 185 |
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186 // Load an oop out of Java heap and decode it to an uncompressed oop. |
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187 static oop load_decode_heap_oop_not_null(narrowOop* p); |
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188 static oop load_decode_heap_oop_not_null(oop* p); |
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189 static oop load_decode_heap_oop(narrowOop* p); |
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190 static oop load_decode_heap_oop(oop* p); |
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191 |
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192 // Store an oop into the heap. |
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193 static void store_heap_oop(narrowOop* p, narrowOop v); |
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194 static void store_heap_oop(oop* p, oop v); |
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195 |
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196 // Encode oop if UseCompressedOops and store into the heap. |
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197 static void encode_store_heap_oop_not_null(narrowOop* p, oop v); |
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198 static void encode_store_heap_oop_not_null(oop* p, oop v); |
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199 static void encode_store_heap_oop(narrowOop* p, oop v); |
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200 static void encode_store_heap_oop(oop* p, oop v); |
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201 |
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202 static void release_store_heap_oop(volatile narrowOop* p, narrowOop v); |
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203 static void release_store_heap_oop(volatile oop* p, oop v); |
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204 |
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205 static void release_encode_store_heap_oop_not_null(volatile narrowOop* p, oop v); |
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206 static void release_encode_store_heap_oop_not_null(volatile oop* p, oop v); |
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207 static void release_encode_store_heap_oop(volatile narrowOop* p, oop v); |
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208 static void release_encode_store_heap_oop(volatile oop* p, oop v); |
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209 |
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210 static oop atomic_exchange_oop(oop exchange_value, volatile HeapWord *dest); |
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211 static oop atomic_compare_exchange_oop(oop exchange_value, |
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212 volatile HeapWord *dest, |
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213 oop compare_value); |
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214 |
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215 // Access to fields in a instanceOop through these methods. |
0 | 216 oop obj_field(int offset) const; |
217 void obj_field_put(int offset, oop value); | |
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218 void obj_field_raw_put(int offset, oop value); |
0 | 219 |
220 jbyte byte_field(int offset) const; | |
221 void byte_field_put(int offset, jbyte contents); | |
222 | |
223 jchar char_field(int offset) const; | |
224 void char_field_put(int offset, jchar contents); | |
225 | |
226 jboolean bool_field(int offset) const; | |
227 void bool_field_put(int offset, jboolean contents); | |
228 | |
229 jint int_field(int offset) const; | |
230 void int_field_put(int offset, jint contents); | |
231 | |
232 jshort short_field(int offset) const; | |
233 void short_field_put(int offset, jshort contents); | |
234 | |
235 jlong long_field(int offset) const; | |
236 void long_field_put(int offset, jlong contents); | |
237 | |
238 jfloat float_field(int offset) const; | |
239 void float_field_put(int offset, jfloat contents); | |
240 | |
241 jdouble double_field(int offset) const; | |
242 void double_field_put(int offset, jdouble contents); | |
243 | |
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244 address address_field(int offset) const; |
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245 void address_field_put(int offset, address contents); |
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246 |
0 | 247 oop obj_field_acquire(int offset) const; |
248 void release_obj_field_put(int offset, oop value); | |
249 | |
250 jbyte byte_field_acquire(int offset) const; | |
251 void release_byte_field_put(int offset, jbyte contents); | |
252 | |
253 jchar char_field_acquire(int offset) const; | |
254 void release_char_field_put(int offset, jchar contents); | |
255 | |
256 jboolean bool_field_acquire(int offset) const; | |
257 void release_bool_field_put(int offset, jboolean contents); | |
258 | |
259 jint int_field_acquire(int offset) const; | |
260 void release_int_field_put(int offset, jint contents); | |
261 | |
262 jshort short_field_acquire(int offset) const; | |
263 void release_short_field_put(int offset, jshort contents); | |
264 | |
265 jlong long_field_acquire(int offset) const; | |
266 void release_long_field_put(int offset, jlong contents); | |
267 | |
268 jfloat float_field_acquire(int offset) const; | |
269 void release_float_field_put(int offset, jfloat contents); | |
270 | |
271 jdouble double_field_acquire(int offset) const; | |
272 void release_double_field_put(int offset, jdouble contents); | |
273 | |
710 | 274 address address_field_acquire(int offset) const; |
275 void release_address_field_put(int offset, address contents); | |
276 | |
0 | 277 // printing functions for VM debugging |
278 void print_on(outputStream* st) const; // First level print | |
279 void print_value_on(outputStream* st) const; // Second level print. | |
280 void print_address_on(outputStream* st) const; // Address printing | |
281 | |
282 // printing on default output stream | |
283 void print(); | |
284 void print_value(); | |
285 void print_address(); | |
286 | |
287 // return the print strings | |
288 char* print_string(); | |
289 char* print_value_string(); | |
290 | |
291 // verification operations | |
292 void verify_on(outputStream* st); | |
293 void verify(); | |
294 void verify_old_oop(oop* p, bool allow_dirty); | |
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295 void verify_old_oop(narrowOop* p, bool allow_dirty); |
0 | 296 |
297 // tells whether this oop is partially constructed (gc during class loading) | |
298 bool partially_loaded(); | |
299 void set_partially_loaded(); | |
300 | |
301 // locking operations | |
302 bool is_locked() const; | |
303 bool is_unlocked() const; | |
304 bool has_bias_pattern() const; | |
305 | |
306 // asserts | |
307 bool is_oop(bool ignore_mark_word = false) const; | |
308 bool is_oop_or_null(bool ignore_mark_word = false) const; | |
309 #ifndef PRODUCT | |
310 bool is_unlocked_oop() const; | |
311 #endif | |
312 | |
313 // garbage collection | |
314 bool is_gc_marked() const; | |
315 // Apply "MarkSweep::mark_and_push" to (the address of) every non-NULL | |
316 // reference field in "this". | |
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317 void follow_contents(void); |
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318 void follow_header(void); |
0 | 319 |
320 #ifndef SERIALGC | |
321 // Parallel Scavenge | |
322 void push_contents(PSPromotionManager* pm); | |
323 | |
324 // Parallel Old | |
325 void update_contents(ParCompactionManager* cm); | |
326 | |
327 void follow_contents(ParCompactionManager* cm); | |
328 void follow_header(ParCompactionManager* cm); | |
329 #endif // SERIALGC | |
330 | |
331 bool is_perm() const; | |
332 bool is_perm_or_null() const; | |
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333 bool is_scavengable() const; |
0 | 334 bool is_shared() const; |
335 bool is_shared_readonly() const; | |
336 bool is_shared_readwrite() const; | |
337 | |
338 // Forward pointer operations for scavenge | |
339 bool is_forwarded() const; | |
340 | |
341 void forward_to(oop p); | |
342 bool cas_forward_to(oop p, markOop compare); | |
343 | |
344 #ifndef SERIALGC | |
345 // Like "forward_to", but inserts the forwarding pointer atomically. | |
346 // Exactly one thread succeeds in inserting the forwarding pointer, and | |
347 // this call returns "NULL" for that thread; any other thread has the | |
348 // value of the forwarding pointer returned and does not modify "this". | |
349 oop forward_to_atomic(oop p); | |
350 #endif // SERIALGC | |
351 | |
352 oop forwardee() const; | |
353 | |
354 // Age of object during scavenge | |
355 int age() const; | |
356 void incr_age(); | |
357 | |
358 // Adjust all pointers in this object to point at it's forwarded location and | |
359 // return the size of this oop. This is used by the MarkSweep collector. | |
360 int adjust_pointers(); | |
361 void adjust_header(); | |
362 | |
363 #ifndef SERIALGC | |
364 // Parallel old | |
365 void update_header(); | |
366 #endif // SERIALGC | |
367 | |
368 // mark-sweep support | |
369 void follow_body(int begin, int end); | |
370 | |
371 // Fast access to barrier set | |
372 static BarrierSet* bs() { return _bs; } | |
373 static void set_bs(BarrierSet* bs) { _bs = bs; } | |
374 | |
375 // iterators, returns size of object | |
342
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376 #define OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ |
0 | 377 int oop_iterate(OopClosureType* blk); \ |
378 int oop_iterate(OopClosureType* blk, MemRegion mr); // Only in mr. | |
379 | |
380 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_DECL) | |
342
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381 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_DECL) |
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382 |
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383 #ifndef SERIALGC |
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384 |
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385 #define OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
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386 int oop_iterate_backwards(OopClosureType* blk); |
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387 |
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388 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_BACKWARDS_DECL) |
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389 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_BACKWARDS_DECL) |
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390 #endif |
0 | 391 |
392 void oop_iterate_header(OopClosure* blk); | |
393 void oop_iterate_header(OopClosure* blk, MemRegion mr); | |
394 | |
395 // identity hash; returns the identity hash key (computes it if necessary) | |
396 // NOTE with the introduction of UseBiasedLocking that identity_hash() might reach a | |
397 // safepoint if called on a biased object. Calling code must be aware of that. | |
398 intptr_t identity_hash(); | |
399 intptr_t slow_identity_hash(); | |
400 | |
401 // marks are forwarded to stack when object is locked | |
402 bool has_displaced_mark() const; | |
403 markOop displaced_mark() const; | |
404 void set_displaced_mark(markOop m); | |
405 | |
406 // for code generation | |
407 static int mark_offset_in_bytes() { return offset_of(oopDesc, _mark); } | |
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408 static int klass_offset_in_bytes() { return offset_of(oopDesc, _metadata._klass); } |
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409 static int klass_gap_offset_in_bytes(); |
0 | 410 }; |
1972 | 411 |
412 #endif // SHARE_VM_OOPS_OOP_HPP |