Mercurial > hg > truffle
annotate src/share/vm/oops/oop.hpp @ 3939:f6f3bb0ee072
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Reviewed-by: kvn
| author | never |
|---|---|
| date | Sun, 11 Sep 2011 14:48:24 -0700 |
| parents | b0efc7ee3b31 |
| children | b632e80fc9dc |
| rev | line source |
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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; | |
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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; |
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217 volatile oop obj_field_volatile(int offset) const; |
| 0 | 218 void obj_field_put(int offset, oop value); |
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219 void obj_field_put_raw(int offset, oop value); |
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220 void obj_field_put_volatile(int offset, oop value); |
| 0 | 221 |
| 222 jbyte byte_field(int offset) const; | |
| 223 void byte_field_put(int offset, jbyte contents); | |
| 224 | |
| 225 jchar char_field(int offset) const; | |
| 226 void char_field_put(int offset, jchar contents); | |
| 227 | |
| 228 jboolean bool_field(int offset) const; | |
| 229 void bool_field_put(int offset, jboolean contents); | |
| 230 | |
| 231 jint int_field(int offset) const; | |
| 232 void int_field_put(int offset, jint contents); | |
| 233 | |
| 234 jshort short_field(int offset) const; | |
| 235 void short_field_put(int offset, jshort contents); | |
| 236 | |
| 237 jlong long_field(int offset) const; | |
| 238 void long_field_put(int offset, jlong contents); | |
| 239 | |
| 240 jfloat float_field(int offset) const; | |
| 241 void float_field_put(int offset, jfloat contents); | |
| 242 | |
| 243 jdouble double_field(int offset) const; | |
| 244 void double_field_put(int offset, jdouble contents); | |
| 245 | |
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246 address address_field(int offset) const; |
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247 void address_field_put(int offset, address contents); |
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248 |
| 0 | 249 oop obj_field_acquire(int offset) const; |
| 250 void release_obj_field_put(int offset, oop value); | |
| 251 | |
| 252 jbyte byte_field_acquire(int offset) const; | |
| 253 void release_byte_field_put(int offset, jbyte contents); | |
| 254 | |
| 255 jchar char_field_acquire(int offset) const; | |
| 256 void release_char_field_put(int offset, jchar contents); | |
| 257 | |
| 258 jboolean bool_field_acquire(int offset) const; | |
| 259 void release_bool_field_put(int offset, jboolean contents); | |
| 260 | |
| 261 jint int_field_acquire(int offset) const; | |
| 262 void release_int_field_put(int offset, jint contents); | |
| 263 | |
| 264 jshort short_field_acquire(int offset) const; | |
| 265 void release_short_field_put(int offset, jshort contents); | |
| 266 | |
| 267 jlong long_field_acquire(int offset) const; | |
| 268 void release_long_field_put(int offset, jlong contents); | |
| 269 | |
| 270 jfloat float_field_acquire(int offset) const; | |
| 271 void release_float_field_put(int offset, jfloat contents); | |
| 272 | |
| 273 jdouble double_field_acquire(int offset) const; | |
| 274 void release_double_field_put(int offset, jdouble contents); | |
| 275 | |
| 710 | 276 address address_field_acquire(int offset) const; |
| 277 void release_address_field_put(int offset, address contents); | |
| 278 | |
| 0 | 279 // printing functions for VM debugging |
| 280 void print_on(outputStream* st) const; // First level print | |
| 281 void print_value_on(outputStream* st) const; // Second level print. | |
| 282 void print_address_on(outputStream* st) const; // Address printing | |
| 283 | |
| 284 // printing on default output stream | |
| 285 void print(); | |
| 286 void print_value(); | |
| 287 void print_address(); | |
| 288 | |
| 289 // return the print strings | |
| 290 char* print_string(); | |
| 291 char* print_value_string(); | |
| 292 | |
| 293 // verification operations | |
| 294 void verify_on(outputStream* st); | |
| 295 void verify(); | |
| 296 void verify_old_oop(oop* p, bool allow_dirty); | |
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297 void verify_old_oop(narrowOop* p, bool allow_dirty); |
| 0 | 298 |
| 299 // tells whether this oop is partially constructed (gc during class loading) | |
| 300 bool partially_loaded(); | |
| 301 void set_partially_loaded(); | |
| 302 | |
| 303 // locking operations | |
| 304 bool is_locked() const; | |
| 305 bool is_unlocked() const; | |
| 306 bool has_bias_pattern() const; | |
| 307 | |
| 308 // asserts | |
| 309 bool is_oop(bool ignore_mark_word = false) const; | |
| 310 bool is_oop_or_null(bool ignore_mark_word = false) const; | |
| 311 #ifndef PRODUCT | |
| 312 bool is_unlocked_oop() const; | |
| 313 #endif | |
| 314 | |
| 315 // garbage collection | |
| 316 bool is_gc_marked() const; | |
| 317 // Apply "MarkSweep::mark_and_push" to (the address of) every non-NULL | |
| 318 // reference field in "this". | |
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319 void follow_contents(void); |
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320 void follow_header(void); |
| 0 | 321 |
| 322 #ifndef SERIALGC | |
| 323 // Parallel Scavenge | |
| 324 void push_contents(PSPromotionManager* pm); | |
| 325 | |
| 326 // Parallel Old | |
| 327 void update_contents(ParCompactionManager* cm); | |
| 328 | |
| 329 void follow_contents(ParCompactionManager* cm); | |
| 330 void follow_header(ParCompactionManager* cm); | |
| 331 #endif // SERIALGC | |
| 332 | |
| 333 bool is_perm() const; | |
| 334 bool is_perm_or_null() const; | |
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335 bool is_scavengable() const; |
| 0 | 336 bool is_shared() const; |
| 337 bool is_shared_readonly() const; | |
| 338 bool is_shared_readwrite() const; | |
| 339 | |
| 340 // Forward pointer operations for scavenge | |
| 341 bool is_forwarded() const; | |
| 342 | |
| 343 void forward_to(oop p); | |
| 344 bool cas_forward_to(oop p, markOop compare); | |
| 345 | |
| 346 #ifndef SERIALGC | |
| 347 // Like "forward_to", but inserts the forwarding pointer atomically. | |
| 348 // Exactly one thread succeeds in inserting the forwarding pointer, and | |
| 349 // this call returns "NULL" for that thread; any other thread has the | |
| 350 // value of the forwarding pointer returned and does not modify "this". | |
| 351 oop forward_to_atomic(oop p); | |
| 352 #endif // SERIALGC | |
| 353 | |
| 354 oop forwardee() const; | |
| 355 | |
| 356 // Age of object during scavenge | |
| 357 int age() const; | |
| 358 void incr_age(); | |
| 359 | |
| 360 // Adjust all pointers in this object to point at it's forwarded location and | |
| 361 // return the size of this oop. This is used by the MarkSweep collector. | |
| 362 int adjust_pointers(); | |
| 363 void adjust_header(); | |
| 364 | |
| 365 #ifndef SERIALGC | |
| 366 // Parallel old | |
| 367 void update_header(); | |
| 368 #endif // SERIALGC | |
| 369 | |
| 370 // mark-sweep support | |
| 371 void follow_body(int begin, int end); | |
| 372 | |
| 373 // Fast access to barrier set | |
| 374 static BarrierSet* bs() { return _bs; } | |
| 375 static void set_bs(BarrierSet* bs) { _bs = bs; } | |
| 376 | |
| 377 // iterators, returns size of object | |
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378 #define OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ |
| 0 | 379 int oop_iterate(OopClosureType* blk); \ |
| 380 int oop_iterate(OopClosureType* blk, MemRegion mr); // Only in mr. | |
| 381 | |
| 382 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_DECL) | |
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383 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_DECL) |
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384 |
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385 #ifndef SERIALGC |
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386 |
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387 #define OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
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388 int oop_iterate_backwards(OopClosureType* blk); |
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389 |
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390 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_ITERATE_BACKWARDS_DECL) |
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391 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_ITERATE_BACKWARDS_DECL) |
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392 #endif |
| 0 | 393 |
| 394 void oop_iterate_header(OopClosure* blk); | |
| 395 void oop_iterate_header(OopClosure* blk, MemRegion mr); | |
| 396 | |
| 397 // identity hash; returns the identity hash key (computes it if necessary) | |
| 398 // NOTE with the introduction of UseBiasedLocking that identity_hash() might reach a | |
| 399 // safepoint if called on a biased object. Calling code must be aware of that. | |
| 400 intptr_t identity_hash(); | |
| 401 intptr_t slow_identity_hash(); | |
| 402 | |
| 403 // marks are forwarded to stack when object is locked | |
| 404 bool has_displaced_mark() const; | |
| 405 markOop displaced_mark() const; | |
| 406 void set_displaced_mark(markOop m); | |
| 407 | |
| 408 // for code generation | |
| 409 static int mark_offset_in_bytes() { return offset_of(oopDesc, _mark); } | |
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410 static int klass_offset_in_bytes() { return offset_of(oopDesc, _metadata._klass); } |
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411 static int klass_gap_offset_in_bytes(); |
| 0 | 412 }; |
| 1972 | 413 |
| 414 #endif // SHARE_VM_OOPS_OOP_HPP |