Mercurial > hg > truffle
annotate src/share/vm/oops/oop.hpp @ 656:6bdd6923ba16
6541756: Reduce executable C-heap
Summary: Add executable parameters to reserve_memory and commit_memory to reduce executable memory to only the Code Heap.
Reviewed-by: xlu, kvn, acorn
author | coleenp |
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date | Wed, 25 Mar 2009 14:19:20 -0400 |
parents | 0fbdb4381b99 |
children | e5b0439ef4ae |
rev | line source |
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0 | 1 /* |
579 | 2 * Copyright 1997-2009 Sun Microsystems, Inc. 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 * | |
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 klassOop klass_or_null() const volatile; |
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81 oop* klass_addr(); |
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82 narrowOop* compressed_klass_addr(); |
0 | 83 |
84 void set_klass(klassOop k); | |
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85 |
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86 // For klass field compression |
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87 int klass_gap() const; |
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88 void set_klass_gap(int z); |
0 | 89 // For when the klass pointer is being used as a linked list "next" field. |
90 void set_klass_to_list_ptr(oop k); | |
91 | |
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92 // size of object header, aligned to platform wordSize |
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93 static int header_size() { return sizeof(oopDesc)/HeapWordSize; } |
0 | 94 |
95 Klass* blueprint() const; | |
96 | |
97 // Returns whether this is an instance of k or an instance of a subclass of k | |
98 bool is_a(klassOop k) const; | |
99 | |
100 // Returns the actual oop size of the object | |
101 int size(); | |
102 | |
103 // Sometimes (for complicated concurrency-related reasons), it is useful | |
104 // to be able to figure out the size of an object knowing its klass. | |
105 int size_given_klass(Klass* klass); | |
106 | |
107 // Some perm gen objects are not parseble immediately after | |
108 // installation of their klass pointer. | |
109 bool is_parsable(); | |
110 | |
518
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111 // Some perm gen objects that have been allocated and initialized |
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112 // can be changed by the VM when not at a safe point (class rededfinition |
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113 // is an example). Such objects should not be examined by the |
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114 // concurrent processing of a garbage collector if is_conc_safe() |
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115 // returns false. |
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116 bool is_conc_safe(); |
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117 |
0 | 118 // type test operations (inlined in oop.inline.h) |
119 bool is_instance() const; | |
120 bool is_instanceRef() const; | |
121 bool is_array() const; | |
122 bool is_objArray() const; | |
123 bool is_symbol() const; | |
124 bool is_klass() const; | |
125 bool is_thread() const; | |
126 bool is_method() const; | |
127 bool is_constMethod() const; | |
128 bool is_methodData() const; | |
129 bool is_constantPool() const; | |
130 bool is_constantPoolCache() const; | |
131 bool is_typeArray() const; | |
132 bool is_javaArray() const; | |
133 bool is_compiledICHolder() const; | |
134 | |
135 private: | |
136 // field addresses in oop | |
137 void* field_base(int offset) const; | |
138 | |
139 jbyte* byte_field_addr(int offset) const; | |
140 jchar* char_field_addr(int offset) const; | |
141 jboolean* bool_field_addr(int offset) const; | |
142 jint* int_field_addr(int offset) const; | |
143 jshort* short_field_addr(int offset) const; | |
144 jlong* long_field_addr(int offset) const; | |
145 jfloat* float_field_addr(int offset) const; | |
146 jdouble* double_field_addr(int offset) const; | |
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147 address* address_field_addr(int offset) const; |
0 | 148 |
149 public: | |
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150 // Need this as public for garbage collection. |
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151 template <class T> T* obj_field_addr(int offset) const; |
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152 |
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153 // Oop encoding heap max |
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154 static const uint64_t OopEncodingHeapMax = |
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155 (uint64_t(max_juint) + 1) << LogMinObjAlignmentInBytes; |
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156 |
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157 static bool is_null(oop obj); |
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158 static bool is_null(narrowOop obj); |
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159 |
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160 // Decode an oop pointer from a narrowOop if compressed. |
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161 // These are overloaded for oop and narrowOop as are the other functions |
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162 // below so that they can be called in template functions. |
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163 static oop decode_heap_oop_not_null(oop v); |
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164 static oop decode_heap_oop_not_null(narrowOop v); |
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165 static oop decode_heap_oop(oop v); |
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166 static oop decode_heap_oop(narrowOop v); |
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167 |
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168 // Encode an oop pointer to a narrow oop. The or_null versions accept |
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169 // null oop pointer, others do not in order to eliminate the |
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170 // null checking branches. |
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171 static narrowOop encode_heap_oop_not_null(oop v); |
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172 static narrowOop encode_heap_oop(oop v); |
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173 |
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174 // Load an oop out of the Java heap |
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175 static narrowOop load_heap_oop(narrowOop* p); |
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176 static oop load_heap_oop(oop* p); |
0 | 177 |
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178 // Load an oop out of Java heap and decode it to an uncompressed oop. |
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179 static oop load_decode_heap_oop_not_null(narrowOop* p); |
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180 static oop load_decode_heap_oop_not_null(oop* p); |
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181 static oop load_decode_heap_oop(narrowOop* p); |
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182 static oop load_decode_heap_oop(oop* p); |
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183 |
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184 // Store an oop into the heap. |
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185 static void store_heap_oop(narrowOop* p, narrowOop v); |
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186 static void store_heap_oop(oop* p, oop v); |
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187 |
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188 // Encode oop if UseCompressedOops and store into the heap. |
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189 static void encode_store_heap_oop_not_null(narrowOop* p, oop v); |
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190 static void encode_store_heap_oop_not_null(oop* p, oop v); |
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191 static void encode_store_heap_oop(narrowOop* p, oop v); |
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192 static void encode_store_heap_oop(oop* p, oop v); |
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193 |
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194 static void release_store_heap_oop(volatile narrowOop* p, narrowOop v); |
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195 static void release_store_heap_oop(volatile oop* p, oop v); |
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196 |
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197 static void release_encode_store_heap_oop_not_null(volatile narrowOop* p, oop v); |
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198 static void release_encode_store_heap_oop_not_null(volatile oop* p, oop v); |
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199 static void release_encode_store_heap_oop(volatile narrowOop* p, oop v); |
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200 static void release_encode_store_heap_oop(volatile oop* p, oop v); |
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201 |
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202 static oop atomic_exchange_oop(oop exchange_value, volatile HeapWord *dest); |
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203 static oop atomic_compare_exchange_oop(oop exchange_value, |
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204 volatile HeapWord *dest, |
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205 oop compare_value); |
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206 |
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207 // Access to fields in a instanceOop through these methods. |
0 | 208 oop obj_field(int offset) const; |
209 void obj_field_put(int offset, oop value); | |
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210 void obj_field_raw_put(int offset, oop value); |
0 | 211 |
212 jbyte byte_field(int offset) const; | |
213 void byte_field_put(int offset, jbyte contents); | |
214 | |
215 jchar char_field(int offset) const; | |
216 void char_field_put(int offset, jchar contents); | |
217 | |
218 jboolean bool_field(int offset) const; | |
219 void bool_field_put(int offset, jboolean contents); | |
220 | |
221 jint int_field(int offset) const; | |
222 void int_field_put(int offset, jint contents); | |
223 | |
224 jshort short_field(int offset) const; | |
225 void short_field_put(int offset, jshort contents); | |
226 | |
227 jlong long_field(int offset) const; | |
228 void long_field_put(int offset, jlong contents); | |
229 | |
230 jfloat float_field(int offset) const; | |
231 void float_field_put(int offset, jfloat contents); | |
232 | |
233 jdouble double_field(int offset) const; | |
234 void double_field_put(int offset, jdouble contents); | |
235 | |
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236 address address_field(int offset) const; |
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237 void address_field_put(int offset, address contents); |
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238 |
0 | 239 oop obj_field_acquire(int offset) const; |
240 void release_obj_field_put(int offset, oop value); | |
241 | |
242 jbyte byte_field_acquire(int offset) const; | |
243 void release_byte_field_put(int offset, jbyte contents); | |
244 | |
245 jchar char_field_acquire(int offset) const; | |
246 void release_char_field_put(int offset, jchar contents); | |
247 | |
248 jboolean bool_field_acquire(int offset) const; | |
249 void release_bool_field_put(int offset, jboolean contents); | |
250 | |
251 jint int_field_acquire(int offset) const; | |
252 void release_int_field_put(int offset, jint contents); | |
253 | |
254 jshort short_field_acquire(int offset) const; | |
255 void release_short_field_put(int offset, jshort contents); | |
256 | |
257 jlong long_field_acquire(int offset) const; | |
258 void release_long_field_put(int offset, jlong contents); | |
259 | |
260 jfloat float_field_acquire(int offset) const; | |
261 void release_float_field_put(int offset, jfloat contents); | |
262 | |
263 jdouble double_field_acquire(int offset) const; | |
264 void release_double_field_put(int offset, jdouble contents); | |
265 | |
266 // printing functions for VM debugging | |
267 void print_on(outputStream* st) const; // First level print | |
268 void print_value_on(outputStream* st) const; // Second level print. | |
269 void print_address_on(outputStream* st) const; // Address printing | |
270 | |
271 // printing on default output stream | |
272 void print(); | |
273 void print_value(); | |
274 void print_address(); | |
275 | |
276 // return the print strings | |
277 char* print_string(); | |
278 char* print_value_string(); | |
279 | |
280 // verification operations | |
281 void verify_on(outputStream* st); | |
282 void verify(); | |
283 void verify_old_oop(oop* p, bool allow_dirty); | |
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284 void verify_old_oop(narrowOop* p, bool allow_dirty); |
0 | 285 |
286 // tells whether this oop is partially constructed (gc during class loading) | |
287 bool partially_loaded(); | |
288 void set_partially_loaded(); | |
289 | |
290 // locking operations | |
291 bool is_locked() const; | |
292 bool is_unlocked() const; | |
293 bool has_bias_pattern() const; | |
294 | |
295 // asserts | |
296 bool is_oop(bool ignore_mark_word = false) const; | |
297 bool is_oop_or_null(bool ignore_mark_word = false) const; | |
298 #ifndef PRODUCT | |
299 bool is_unlocked_oop() const; | |
300 #endif | |
301 | |
302 // garbage collection | |
303 bool is_gc_marked() const; | |
304 // Apply "MarkSweep::mark_and_push" to (the address of) every non-NULL | |
305 // reference field in "this". | |
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306 void follow_contents(void); |
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307 void follow_header(void); |
0 | 308 |
309 #ifndef SERIALGC | |
310 // Parallel Scavenge | |
311 void copy_contents(PSPromotionManager* pm); | |
312 void push_contents(PSPromotionManager* pm); | |
313 | |
314 // Parallel Old | |
315 void update_contents(ParCompactionManager* cm); | |
316 void update_contents(ParCompactionManager* cm, | |
317 HeapWord* begin_limit, | |
318 HeapWord* end_limit); | |
319 void update_contents(ParCompactionManager* cm, | |
320 klassOop old_klass, | |
321 HeapWord* begin_limit, | |
322 HeapWord* end_limit); | |
323 | |
324 void follow_contents(ParCompactionManager* cm); | |
325 void follow_header(ParCompactionManager* cm); | |
326 #endif // SERIALGC | |
327 | |
328 bool is_perm() const; | |
329 bool is_perm_or_null() const; | |
330 bool is_shared() const; | |
331 bool is_shared_readonly() const; | |
332 bool is_shared_readwrite() const; | |
333 | |
334 // Forward pointer operations for scavenge | |
335 bool is_forwarded() const; | |
336 | |
337 void forward_to(oop p); | |
338 bool cas_forward_to(oop p, markOop compare); | |
339 | |
340 #ifndef SERIALGC | |
341 // Like "forward_to", but inserts the forwarding pointer atomically. | |
342 // Exactly one thread succeeds in inserting the forwarding pointer, and | |
343 // this call returns "NULL" for that thread; any other thread has the | |
344 // value of the forwarding pointer returned and does not modify "this". | |
345 oop forward_to_atomic(oop p); | |
346 #endif // SERIALGC | |
347 | |
348 oop forwardee() const; | |
349 | |
350 // Age of object during scavenge | |
351 int age() const; | |
352 void incr_age(); | |
353 | |
354 // Adjust all pointers in this object to point at it's forwarded location and | |
355 // return the size of this oop. This is used by the MarkSweep collector. | |
356 int adjust_pointers(); | |
357 void adjust_header(); | |
358 | |
359 #ifndef SERIALGC | |
360 // Parallel old | |
361 void update_header(); | |
362 void update_header(HeapWord* beg_addr, HeapWord* end_addr); | |
363 #endif // SERIALGC | |
364 | |
365 // mark-sweep support | |
366 void follow_body(int begin, int end); | |
367 | |
368 // Fast access to barrier set | |
369 static BarrierSet* bs() { return _bs; } | |
370 static void set_bs(BarrierSet* bs) { _bs = bs; } | |
371 | |
372 // iterators, returns size of object | |
342
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373 #define OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ |
0 | 374 int oop_iterate(OopClosureType* blk); \ |
375 int oop_iterate(OopClosureType* blk, MemRegion mr); // Only in mr. | |
376 | |
377 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_DECL) | |
342
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378 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_DECL) |
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379 |
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380 #ifndef SERIALGC |
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381 |
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382 #define OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
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383 int oop_iterate_backwards(OopClosureType* blk); |
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384 |
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385 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_BACKWARDS_DECL) |
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386 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_BACKWARDS_DECL) |
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387 #endif |
0 | 388 |
389 void oop_iterate_header(OopClosure* blk); | |
390 void oop_iterate_header(OopClosure* blk, MemRegion mr); | |
391 | |
392 // identity hash; returns the identity hash key (computes it if necessary) | |
393 // NOTE with the introduction of UseBiasedLocking that identity_hash() might reach a | |
394 // safepoint if called on a biased object. Calling code must be aware of that. | |
395 intptr_t identity_hash(); | |
396 intptr_t slow_identity_hash(); | |
397 | |
398 // marks are forwarded to stack when object is locked | |
399 bool has_displaced_mark() const; | |
400 markOop displaced_mark() const; | |
401 void set_displaced_mark(markOop m); | |
402 | |
403 // for code generation | |
404 static int mark_offset_in_bytes() { return offset_of(oopDesc, _mark); } | |
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405 static int klass_offset_in_bytes() { return offset_of(oopDesc, _metadata._klass); } |
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406 static int klass_gap_offset_in_bytes(); |
0 | 407 }; |