Mercurial > hg > truffle
annotate src/share/vm/oops/instanceKlass.hpp @ 431:a45484ea312d
6653858: dynamic languages need to be able to load anonymous classes
Summary: low-level privileged sun.misc.Unsafe.defineAnonymousClass
Reviewed-by: kvn
| author | jrose |
|---|---|
| date | Wed, 12 Nov 2008 22:33:26 -0800 |
| parents | 1ee8caae33af |
| children | 4aaa9f5e02a8 c89f86385056 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 196 | 2 * Copyright 1997-2008 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 // An instanceKlass is the VM level representation of a Java class. | |
| 26 // It contains all information needed for at class at execution runtime. | |
| 27 | |
| 28 // instanceKlass layout: | |
| 29 // [header ] klassOop | |
| 30 // [klass pointer ] klassOop | |
| 31 // [C++ vtbl pointer ] Klass | |
| 32 // [subtype cache ] Klass | |
| 33 // [instance size ] Klass | |
| 34 // [java mirror ] Klass | |
| 35 // [super ] Klass | |
| 36 // [access_flags ] Klass | |
| 37 // [name ] Klass | |
| 38 // [first subklass ] Klass | |
| 39 // [next sibling ] Klass | |
| 40 // [array klasses ] | |
| 41 // [methods ] | |
| 42 // [local interfaces ] | |
| 43 // [transitive interfaces ] | |
| 44 // [number of implementors ] | |
| 45 // [implementors ] klassOop[2] | |
| 46 // [fields ] | |
| 47 // [constants ] | |
| 48 // [class loader ] | |
| 49 // [protection domain ] | |
| 50 // [signers ] | |
| 51 // [source file name ] | |
| 52 // [inner classes ] | |
| 53 // [static field size ] | |
| 54 // [nonstatic field size ] | |
| 55 // [static oop fields size ] | |
| 56 // [nonstatic oop maps size ] | |
| 57 // [has finalize method ] | |
| 58 // [deoptimization mark bit ] | |
| 59 // [initialization state ] | |
| 60 // [initializing thread ] | |
| 61 // [Java vtable length ] | |
| 62 // [oop map cache (stack maps) ] | |
| 63 // [EMBEDDED Java vtable ] size in words = vtable_len | |
| 64 // [EMBEDDED static oop fields ] size in words = static_oop_fields_size | |
| 65 // [ static non-oop fields ] size in words = static_field_size - static_oop_fields_size | |
| 66 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size | |
| 67 // | |
| 68 // The embedded nonstatic oop-map blocks are short pairs (offset, length) indicating | |
| 69 // where oops are located in instances of this klass. | |
| 70 | |
| 71 | |
| 72 // forward declaration for class -- see below for definition | |
| 73 class SuperTypeClosure; | |
| 74 class OopMapBlock; | |
| 75 class JNIid; | |
| 76 class jniIdMapBase; | |
| 77 class BreakpointInfo; | |
| 78 class fieldDescriptor; | |
| 79 class DepChange; | |
| 80 class nmethodBucket; | |
| 81 class PreviousVersionNode; | |
| 82 class JvmtiCachedClassFieldMap; | |
| 83 | |
| 84 // This is used in iterators below. | |
| 85 class FieldClosure: public StackObj { | |
| 86 public: | |
| 87 virtual void do_field(fieldDescriptor* fd) = 0; | |
| 88 }; | |
| 89 | |
| 90 #ifndef PRODUCT | |
| 91 // Print fields. | |
| 92 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. | |
| 93 class FieldPrinter: public FieldClosure { | |
| 94 oop _obj; | |
| 95 outputStream* _st; | |
| 96 public: | |
| 97 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} | |
| 98 void do_field(fieldDescriptor* fd); | |
| 99 }; | |
| 100 #endif // !PRODUCT | |
| 101 | |
| 102 class instanceKlass: public Klass { | |
| 103 friend class VMStructs; | |
| 104 public: | |
| 105 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description | |
| 106 // of the class loading & initialization procedure, and the use of the states. | |
| 107 enum ClassState { | |
| 108 unparsable_by_gc = 0, // object is not yet parsable by gc. Value of _init_state at object allocation. | |
| 109 allocated, // allocated (but not yet linked) | |
| 110 loaded, // loaded and inserted in class hierarchy (but not linked yet) | |
| 111 linked, // successfully linked/verified (but not initialized yet) | |
| 112 being_initialized, // currently running class initializer | |
| 113 fully_initialized, // initialized (successfull final state) | |
| 114 initialization_error // error happened during initialization | |
| 115 }; | |
| 116 | |
| 117 public: | |
| 118 oop* oop_block_beg() const { return adr_array_klasses(); } | |
| 119 oop* oop_block_end() const { return adr_methods_default_annotations() + 1; } | |
| 120 | |
| 121 enum { | |
| 122 implementors_limit = 2 // how many implems can we track? | |
| 123 }; | |
| 124 | |
| 125 protected: | |
| 126 // | |
| 127 // The oop block. See comment in klass.hpp before making changes. | |
| 128 // | |
| 129 | |
| 130 // Array classes holding elements of this class. | |
| 131 klassOop _array_klasses; | |
| 132 // Method array. | |
| 133 objArrayOop _methods; | |
| 134 // Int array containing the original order of method in the class file (for | |
| 135 // JVMTI). | |
| 136 typeArrayOop _method_ordering; | |
| 137 // Interface (klassOops) this class declares locally to implement. | |
| 138 objArrayOop _local_interfaces; | |
| 139 // Interface (klassOops) this class implements transitively. | |
| 140 objArrayOop _transitive_interfaces; | |
| 141 // Instance and static variable information, 5-tuples of shorts [access, name | |
| 142 // index, sig index, initval index, offset]. | |
| 143 typeArrayOop _fields; | |
| 144 // Constant pool for this class. | |
| 145 constantPoolOop _constants; | |
| 146 // Class loader used to load this class, NULL if VM loader used. | |
| 147 oop _class_loader; | |
| 148 // Protection domain. | |
| 149 oop _protection_domain; | |
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150 // Host class, which grants its access privileges to this class also. |
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151 // This is only non-null for an anonymous class (AnonymousClasses enabled). |
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152 // The host class is either named, or a previously loaded anonymous class. |
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153 klassOop _host_klass; |
| 0 | 154 // Class signers. |
| 155 objArrayOop _signers; | |
| 156 // Name of source file containing this klass, NULL if not specified. | |
| 157 symbolOop _source_file_name; | |
| 158 // the source debug extension for this klass, NULL if not specified. | |
| 159 symbolOop _source_debug_extension; | |
| 160 // inner_classes attribute. | |
| 161 typeArrayOop _inner_classes; | |
| 162 // Implementors of this interface (not valid if it overflows) | |
| 163 klassOop _implementors[implementors_limit]; | |
| 164 // Generic signature, or null if none. | |
| 165 symbolOop _generic_signature; | |
| 166 // Annotations for this class, or null if none. | |
| 167 typeArrayOop _class_annotations; | |
| 168 // Annotation objects (byte arrays) for fields, or null if no annotations. | |
| 169 // Indices correspond to entries (not indices) in fields array. | |
| 170 objArrayOop _fields_annotations; | |
| 171 // Annotation objects (byte arrays) for methods, or null if no annotations. | |
| 172 // Index is the idnum, which is initially the same as the methods array index. | |
| 173 objArrayOop _methods_annotations; | |
| 174 // Annotation objects (byte arrays) for methods' parameters, or null if no | |
| 175 // such annotations. | |
| 176 // Index is the idnum, which is initially the same as the methods array index. | |
| 177 objArrayOop _methods_parameter_annotations; | |
| 178 // Annotation objects (byte arrays) for methods' default values, or null if no | |
| 179 // such annotations. | |
| 180 // Index is the idnum, which is initially the same as the methods array index. | |
| 181 objArrayOop _methods_default_annotations; | |
| 182 | |
| 183 // | |
| 184 // End of the oop block. | |
| 185 // | |
| 186 | |
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187 // Number of heapOopSize words used by non-static fields in this klass |
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188 // (including inherited fields but after header_size()). |
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189 int _nonstatic_field_size; |
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190 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass |
| 0 | 191 int _static_oop_field_size;// number of static oop fields in this klass |
| 192 int _nonstatic_oop_map_size;// number of nonstatic oop-map blocks allocated at end of this klass | |
| 193 bool _is_marked_dependent; // used for marking during flushing and deoptimization | |
| 194 bool _rewritten; // methods rewritten. | |
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195 bool _has_nonstatic_fields; // for sizing with UseCompressedOops |
| 0 | 196 u2 _minor_version; // minor version number of class file |
| 197 u2 _major_version; // major version number of class file | |
| 198 ClassState _init_state; // state of class | |
| 199 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) | |
| 200 int _vtable_len; // length of Java vtable (in words) | |
| 201 int _itable_len; // length of Java itable (in words) | |
| 202 ReferenceType _reference_type; // reference type | |
| 203 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) | |
| 204 JNIid* _jni_ids; // First JNI identifier for static fields in this class | |
| 205 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none | |
| 206 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL | |
| 207 nmethodBucket* _dependencies; // list of dependent nmethods | |
| 208 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class | |
| 209 BreakpointInfo* _breakpoints; // bpt lists, managed by methodOop | |
| 210 int _nof_implementors; // No of implementors of this interface (zero if not an interface) | |
| 211 // Array of interesting part(s) of the previous version(s) of this | |
| 212 // instanceKlass. See PreviousVersionWalker below. | |
| 213 GrowableArray<PreviousVersionNode *>* _previous_versions; | |
| 214 u2 _enclosing_method_class_index; // Constant pool index for class of enclosing method, or 0 if none | |
| 215 u2 _enclosing_method_method_index; // Constant pool index for name and type of enclosing method, or 0 if none | |
| 216 // JVMTI fields can be moved to their own structure - see 6315920 | |
| 217 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH | |
| 218 jint _cached_class_file_len; // JVMTI: length of above | |
| 219 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration | |
| 220 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change | |
| 221 | |
| 222 // embedded Java vtable follows here | |
| 223 // embedded Java itables follows here | |
| 224 // embedded static fields follows here | |
| 225 // embedded nonstatic oop-map blocks follows here | |
| 226 | |
| 227 friend class instanceKlassKlass; | |
| 228 friend class SystemDictionary; | |
| 229 | |
| 230 public: | |
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231 bool has_nonstatic_fields() const { return _has_nonstatic_fields; } |
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232 void set_has_nonstatic_fields(bool b) { _has_nonstatic_fields = b; } |
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233 |
| 0 | 234 // field sizes |
| 235 int nonstatic_field_size() const { return _nonstatic_field_size; } | |
| 236 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } | |
| 237 | |
| 238 int static_field_size() const { return _static_field_size; } | |
| 239 void set_static_field_size(int size) { _static_field_size = size; } | |
| 240 | |
| 241 int static_oop_field_size() const { return _static_oop_field_size; } | |
| 242 void set_static_oop_field_size(int size) { _static_oop_field_size = size; } | |
| 243 | |
| 244 // Java vtable | |
| 245 int vtable_length() const { return _vtable_len; } | |
| 246 void set_vtable_length(int len) { _vtable_len = len; } | |
| 247 | |
| 248 // Java itable | |
| 249 int itable_length() const { return _itable_len; } | |
| 250 void set_itable_length(int len) { _itable_len = len; } | |
| 251 | |
| 252 // array klasses | |
| 253 klassOop array_klasses() const { return _array_klasses; } | |
| 254 void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); } | |
| 255 | |
| 256 // methods | |
| 257 objArrayOop methods() const { return _methods; } | |
| 258 void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); } | |
| 259 methodOop method_with_idnum(int idnum); | |
| 260 | |
| 261 // method ordering | |
| 262 typeArrayOop method_ordering() const { return _method_ordering; } | |
| 263 void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); } | |
| 264 | |
| 265 // interfaces | |
| 266 objArrayOop local_interfaces() const { return _local_interfaces; } | |
| 267 void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); } | |
| 268 objArrayOop transitive_interfaces() const { return _transitive_interfaces; } | |
| 269 void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); } | |
| 270 | |
| 271 // fields | |
| 272 // Field info extracted from the class file and stored | |
| 273 // as an array of 7 shorts | |
| 274 enum FieldOffset { | |
| 275 access_flags_offset = 0, | |
| 276 name_index_offset = 1, | |
| 277 signature_index_offset = 2, | |
| 278 initval_index_offset = 3, | |
| 279 low_offset = 4, | |
| 280 high_offset = 5, | |
| 281 generic_signature_offset = 6, | |
| 282 next_offset = 7 | |
| 283 }; | |
| 284 | |
| 285 typeArrayOop fields() const { return _fields; } | |
| 286 int offset_from_fields( int index ) const { | |
| 287 return build_int_from_shorts( fields()->ushort_at(index + low_offset), | |
| 288 fields()->ushort_at(index + high_offset) ); | |
| 289 } | |
| 290 | |
| 291 void set_fields(typeArrayOop f) { oop_store_without_check((oop*) &_fields, (oop) f); } | |
| 292 | |
| 293 // inner classes | |
| 294 typeArrayOop inner_classes() const { return _inner_classes; } | |
| 295 void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) f); } | |
| 296 | |
| 297 enum InnerClassAttributeOffset { | |
| 298 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 | |
| 299 inner_class_inner_class_info_offset = 0, | |
| 300 inner_class_outer_class_info_offset = 1, | |
| 301 inner_class_inner_name_offset = 2, | |
| 302 inner_class_access_flags_offset = 3, | |
| 303 inner_class_next_offset = 4 | |
| 304 }; | |
| 305 | |
| 306 // package | |
| 307 bool is_same_class_package(klassOop class2); | |
| 308 bool is_same_class_package(oop classloader2, symbolOop classname2); | |
| 309 static bool is_same_class_package(oop class_loader1, symbolOop class_name1, oop class_loader2, symbolOop class_name2); | |
| 310 | |
| 311 // initialization state | |
| 312 bool is_loaded() const { return _init_state >= loaded; } | |
| 313 bool is_linked() const { return _init_state >= linked; } | |
| 314 bool is_initialized() const { return _init_state == fully_initialized; } | |
| 315 bool is_not_initialized() const { return _init_state < being_initialized; } | |
| 316 bool is_being_initialized() const { return _init_state == being_initialized; } | |
| 317 bool is_in_error_state() const { return _init_state == initialization_error; } | |
| 318 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } | |
| 319 int get_init_state() { return _init_state; } // Useful for debugging | |
| 320 bool is_rewritten() const { return _rewritten; } | |
| 321 | |
| 322 // marking | |
| 323 bool is_marked_dependent() const { return _is_marked_dependent; } | |
| 324 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } | |
| 325 | |
| 326 // initialization (virtuals from Klass) | |
| 327 bool should_be_initialized() const; // means that initialize should be called | |
| 328 void initialize(TRAPS); | |
| 329 void link_class(TRAPS); | |
| 330 bool link_class_or_fail(TRAPS); // returns false on failure | |
| 331 void unlink_class(); | |
| 332 void rewrite_class(TRAPS); | |
| 333 methodOop class_initializer(); | |
| 334 | |
| 335 // set the class to initialized if no static initializer is present | |
| 336 void eager_initialize(Thread *thread); | |
| 337 | |
| 338 // reference type | |
| 339 ReferenceType reference_type() const { return _reference_type; } | |
| 340 void set_reference_type(ReferenceType t) { _reference_type = t; } | |
| 341 | |
| 342 // find local field, returns true if found | |
| 343 bool find_local_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const; | |
| 344 // find field in direct superinterfaces, returns the interface in which the field is defined | |
| 345 klassOop find_interface_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const; | |
| 346 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined | |
| 347 klassOop find_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const; | |
| 348 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined | |
| 349 klassOop find_field(symbolOop name, symbolOop sig, bool is_static, fieldDescriptor* fd) const; | |
| 350 | |
| 351 // find a non-static or static field given its offset within the class. | |
| 352 bool contains_field_offset(int offset) { | |
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353 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); |
| 0 | 354 } |
| 355 | |
| 356 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; | |
| 357 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; | |
| 358 | |
| 359 // find a local method (returns NULL if not found) | |
| 360 methodOop find_method(symbolOop name, symbolOop signature) const; | |
| 361 static methodOop find_method(objArrayOop methods, symbolOop name, symbolOop signature); | |
| 362 | |
| 363 // lookup operation (returns NULL if not found) | |
| 364 methodOop uncached_lookup_method(symbolOop name, symbolOop signature) const; | |
| 365 | |
| 366 // lookup a method in all the interfaces that this class implements | |
| 367 // (returns NULL if not found) | |
| 368 methodOop lookup_method_in_all_interfaces(symbolOop name, symbolOop signature) const; | |
| 369 | |
| 370 // constant pool | |
| 371 constantPoolOop constants() const { return _constants; } | |
| 372 void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); } | |
| 373 | |
| 374 // class loader | |
| 375 oop class_loader() const { return _class_loader; } | |
| 376 void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); } | |
| 377 | |
| 378 // protection domain | |
| 379 oop protection_domain() { return _protection_domain; } | |
| 380 void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); } | |
| 381 | |
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382 // host class |
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383 oop host_klass() const { return _host_klass; } |
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384 void set_host_klass(oop host) { oop_store((oop*) &_host_klass, host); } |
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385 bool is_anonymous() const { return _host_klass != NULL; } |
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386 |
| 0 | 387 // signers |
| 388 objArrayOop signers() const { return _signers; } | |
| 389 void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); } | |
| 390 | |
| 391 // source file name | |
| 392 symbolOop source_file_name() const { return _source_file_name; } | |
| 393 void set_source_file_name(symbolOop n) { oop_store_without_check((oop*) &_source_file_name, (oop) n); } | |
| 394 | |
| 395 // minor and major version numbers of class file | |
| 396 u2 minor_version() const { return _minor_version; } | |
| 397 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } | |
| 398 u2 major_version() const { return _major_version; } | |
| 399 void set_major_version(u2 major_version) { _major_version = major_version; } | |
| 400 | |
| 401 // source debug extension | |
| 402 symbolOop source_debug_extension() const { return _source_debug_extension; } | |
| 403 void set_source_debug_extension(symbolOop n){ oop_store_without_check((oop*) &_source_debug_extension, (oop) n); } | |
| 404 | |
| 405 // nonstatic oop-map blocks | |
| 406 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } | |
| 407 void set_nonstatic_oop_map_size(int size) { _nonstatic_oop_map_size = size; } | |
| 408 | |
| 409 // RedefineClasses() support for previous versions: | |
| 410 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods, | |
| 411 int emcp_method_count); | |
| 412 bool has_previous_version() const; | |
| 413 void init_previous_versions() { | |
| 414 _previous_versions = NULL; | |
| 415 } | |
| 416 GrowableArray<PreviousVersionNode *>* previous_versions() const { | |
| 417 return _previous_versions; | |
| 418 } | |
| 419 | |
| 420 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation | |
| 421 void set_cached_class_file(unsigned char *class_file_bytes, | |
| 422 jint class_file_len) { _cached_class_file_len = class_file_len; | |
| 423 _cached_class_file_bytes = class_file_bytes; } | |
| 424 jint get_cached_class_file_len() { return _cached_class_file_len; } | |
| 425 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; } | |
| 426 | |
| 427 // JVMTI: Support for caching of field indices, types, and offsets | |
| 428 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { | |
| 429 _jvmti_cached_class_field_map = descriptor; | |
| 430 } | |
| 431 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { | |
| 432 return _jvmti_cached_class_field_map; | |
| 433 } | |
| 434 | |
| 435 // for adding methods, constMethodOopDesc::UNSET_IDNUM means no more ids available | |
| 436 inline u2 next_method_idnum(); | |
| 437 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } | |
| 438 | |
| 439 // generics support | |
| 440 symbolOop generic_signature() const { return _generic_signature; } | |
| 441 void set_generic_signature(symbolOop sig) { oop_store_without_check((oop*)&_generic_signature, (oop)sig); } | |
| 442 u2 enclosing_method_class_index() const { return _enclosing_method_class_index; } | |
| 443 u2 enclosing_method_method_index() const { return _enclosing_method_method_index; } | |
| 444 void set_enclosing_method_indices(u2 class_index, | |
| 445 u2 method_index) { _enclosing_method_class_index = class_index; | |
| 446 _enclosing_method_method_index = method_index; } | |
| 447 | |
| 448 // jmethodID support | |
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449 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, size_t idnum, |
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450 jmethodID new_id, jmethodID* new_jmeths); |
| 0 | 451 static jmethodID jmethod_id_for_impl(instanceKlassHandle ik_h, methodHandle method_h); |
| 452 jmethodID jmethod_id_or_null(methodOop method); | |
| 453 | |
| 454 // cached itable index support | |
| 455 void set_cached_itable_index(size_t idnum, int index); | |
| 456 int cached_itable_index(size_t idnum); | |
| 457 | |
| 458 // annotations support | |
| 459 typeArrayOop class_annotations() const { return _class_annotations; } | |
| 460 objArrayOop fields_annotations() const { return _fields_annotations; } | |
| 461 objArrayOop methods_annotations() const { return _methods_annotations; } | |
| 462 objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; } | |
| 463 objArrayOop methods_default_annotations() const { return _methods_default_annotations; } | |
| 464 void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); } | |
| 465 void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); } | |
| 466 void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); } | |
| 467 void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); } | |
| 468 void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); } | |
| 469 typeArrayOop get_method_annotations_of(int idnum) | |
| 470 { return get_method_annotations_from(idnum, _methods_annotations); } | |
| 471 typeArrayOop get_method_parameter_annotations_of(int idnum) | |
| 472 { return get_method_annotations_from(idnum, _methods_parameter_annotations); } | |
| 473 typeArrayOop get_method_default_annotations_of(int idnum) | |
| 474 { return get_method_annotations_from(idnum, _methods_default_annotations); } | |
| 475 void set_method_annotations_of(int idnum, typeArrayOop anno) | |
| 476 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } | |
| 477 void set_method_parameter_annotations_of(int idnum, typeArrayOop anno) | |
| 478 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } | |
| 479 void set_method_default_annotations_of(int idnum, typeArrayOop anno) | |
| 480 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } | |
| 481 | |
| 482 // allocation | |
| 483 DEFINE_ALLOCATE_PERMANENT(instanceKlass); | |
| 484 instanceOop allocate_instance(TRAPS); | |
| 485 instanceOop allocate_permanent_instance(TRAPS); | |
| 486 | |
| 487 // additional member function to return a handle | |
| 488 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } | |
| 489 | |
| 490 objArrayOop allocate_objArray(int n, int length, TRAPS); | |
| 491 // Helper function | |
| 492 static instanceOop register_finalizer(instanceOop i, TRAPS); | |
| 493 | |
| 494 // Check whether reflection/jni/jvm code is allowed to instantiate this class; | |
| 495 // if not, throw either an Error or an Exception. | |
| 496 virtual void check_valid_for_instantiation(bool throwError, TRAPS); | |
| 497 | |
| 498 // initialization | |
| 499 void call_class_initializer(TRAPS); | |
| 500 void set_initialization_state_and_notify(ClassState state, TRAPS); | |
| 501 | |
| 502 // OopMapCache support | |
| 503 OopMapCache* oop_map_cache() { return _oop_map_cache; } | |
| 504 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } | |
| 505 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry); | |
| 506 | |
| 507 // JNI identifier support (for static fields - for jni performance) | |
| 508 JNIid* jni_ids() { return _jni_ids; } | |
| 509 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } | |
| 510 JNIid* jni_id_for(int offset); | |
| 511 | |
| 512 // maintenance of deoptimization dependencies | |
| 513 int mark_dependent_nmethods(DepChange& changes); | |
| 514 void add_dependent_nmethod(nmethod* nm); | |
| 515 void remove_dependent_nmethod(nmethod* nm); | |
| 516 | |
| 517 // On-stack replacement support | |
| 518 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; | |
| 519 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; | |
| 520 void add_osr_nmethod(nmethod* n); | |
| 521 void remove_osr_nmethod(nmethod* n); | |
| 522 nmethod* lookup_osr_nmethod(const methodOop m, int bci) const; | |
| 523 | |
| 524 // Breakpoint support (see methods on methodOop for details) | |
| 525 BreakpointInfo* breakpoints() const { return _breakpoints; }; | |
| 526 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; | |
| 527 | |
| 528 // support for stub routines | |
| 529 static int init_state_offset_in_bytes() { return offset_of(instanceKlass, _init_state); } | |
| 530 static int init_thread_offset_in_bytes() { return offset_of(instanceKlass, _init_thread); } | |
| 531 | |
| 532 // subclass/subinterface checks | |
| 533 bool implements_interface(klassOop k) const; | |
| 534 | |
| 535 // Access to implementors of an interface. We only store the count | |
| 536 // of implementors, and in case, there are only a few | |
| 537 // implementors, we store them in a short list. | |
| 538 // This accessor returns NULL if we walk off the end of the list. | |
| 539 klassOop implementor(int i) const { | |
| 540 return (i < implementors_limit)? _implementors[i]: (klassOop) NULL; | |
| 541 } | |
| 542 int nof_implementors() const { return _nof_implementors; } | |
| 543 void add_implementor(klassOop k); // k is a new class that implements this interface | |
| 544 void init_implementor(); // initialize | |
| 545 | |
| 546 // link this class into the implementors list of every interface it implements | |
| 547 void process_interfaces(Thread *thread); | |
| 548 | |
| 549 // virtual operations from Klass | |
| 550 bool is_leaf_class() const { return _subklass == NULL; } | |
| 551 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS); | |
| 552 bool compute_is_subtype_of(klassOop k); | |
| 553 bool can_be_primary_super_slow() const; | |
| 554 klassOop java_super() const { return super(); } | |
| 555 int oop_size(oop obj) const { return size_helper(); } | |
| 556 int klass_oop_size() const { return object_size(); } | |
| 557 bool oop_is_instance_slow() const { return true; } | |
| 558 | |
| 559 // Iterators | |
| 560 void do_local_static_fields(FieldClosure* cl); | |
| 561 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields | |
| 562 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS); | |
| 563 | |
| 564 void methods_do(void f(methodOop method)); | |
| 565 void array_klasses_do(void f(klassOop k)); | |
| 566 void with_array_klasses_do(void f(klassOop k)); | |
| 567 bool super_types_do(SuperTypeClosure* blk); | |
| 568 | |
| 569 // Casting from klassOop | |
| 570 static instanceKlass* cast(klassOop k) { | |
| 571 Klass* kp = k->klass_part(); | |
| 572 assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass"); | |
| 573 return (instanceKlass*) kp; | |
| 574 } | |
| 575 | |
| 576 // Sizing (in words) | |
| 577 static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); } | |
| 578 int object_size() const { return object_size(align_object_offset(vtable_length()) + align_object_offset(itable_length()) + static_field_size() + nonstatic_oop_map_size()); } | |
| 579 static int vtable_start_offset() { return header_size(); } | |
| 580 static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; } | |
| 581 static int object_size(int extra) { return align_object_size(header_size() + extra); } | |
| 582 | |
| 583 intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + vtable_start_offset(); } | |
| 584 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); } | |
| 585 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)as_klassOop(); } | |
| 586 | |
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587 // Static field offset is an offset into the Heap, should be converted by |
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588 // based on UseCompressedOop for traversal |
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589 HeapWord* start_of_static_fields() const { |
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590 return (HeapWord*)(start_of_itable() + align_object_offset(itable_length())); |
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591 } |
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592 |
| 0 | 593 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } |
| 594 | |
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595 int offset_of_static_fields() const { |
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596 return (intptr_t)start_of_static_fields() - (intptr_t)as_klassOop(); |
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597 } |
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598 |
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599 OopMapBlock* start_of_nonstatic_oop_maps() const { |
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600 return (OopMapBlock*) (start_of_static_fields() + static_field_size()); |
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601 } |
| 0 | 602 |
| 603 // Allocation profiling support | |
| 604 juint alloc_size() const { return _alloc_count * size_helper(); } | |
| 605 void set_alloc_size(juint n) {} | |
| 606 | |
| 607 // Use this to return the size of an instance in heap words: | |
| 608 int size_helper() const { | |
| 609 return layout_helper_to_size_helper(layout_helper()); | |
| 610 } | |
| 611 | |
| 612 // This bit is initialized in classFileParser.cpp. | |
| 613 // It is false under any of the following conditions: | |
| 614 // - the class is abstract (including any interface) | |
| 615 // - the class has a finalizer (if !RegisterFinalizersAtInit) | |
| 616 // - the class size is larger than FastAllocateSizeLimit | |
| 617 // - the class is java/lang/Class, which cannot be allocated directly | |
| 618 bool can_be_fastpath_allocated() const { | |
| 619 return !layout_helper_needs_slow_path(layout_helper()); | |
| 620 } | |
| 621 | |
| 622 // Java vtable/itable | |
| 623 klassVtable* vtable() const; // return new klassVtable wrapper | |
| 624 inline methodOop method_at_vtable(int index); | |
| 625 klassItable* itable() const; // return new klassItable wrapper | |
| 626 methodOop method_at_itable(klassOop holder, int index, TRAPS); | |
| 627 | |
| 628 // Garbage collection | |
| 629 void oop_follow_contents(oop obj); | |
| 630 void follow_static_fields(); | |
| 631 void adjust_static_fields(); | |
| 632 int oop_adjust_pointers(oop obj); | |
| 633 bool object_is_parsable() const { return _init_state != unparsable_by_gc; } | |
| 634 // Value of _init_state must be zero (unparsable_by_gc) when klass field is set. | |
| 635 | |
| 636 void follow_weak_klass_links( | |
| 637 BoolObjectClosure* is_alive, OopClosure* keep_alive); | |
| 638 void release_C_heap_structures(); | |
| 639 | |
| 640 // Parallel Scavenge and Parallel Old | |
| 641 PARALLEL_GC_DECLS | |
| 642 | |
| 643 #ifndef SERIALGC | |
| 644 // Parallel Scavenge | |
| 645 void copy_static_fields(PSPromotionManager* pm); | |
| 646 void push_static_fields(PSPromotionManager* pm); | |
| 647 | |
| 648 // Parallel Old | |
| 649 void follow_static_fields(ParCompactionManager* cm); | |
| 650 void copy_static_fields(ParCompactionManager* cm); | |
| 651 void update_static_fields(); | |
| 652 void update_static_fields(HeapWord* beg_addr, HeapWord* end_addr); | |
| 653 #endif // SERIALGC | |
| 654 | |
| 655 // Naming | |
| 656 char* signature_name() const; | |
| 657 | |
| 658 // Iterators | |
| 659 int oop_oop_iterate(oop obj, OopClosure* blk) { | |
| 660 return oop_oop_iterate_v(obj, blk); | |
| 661 } | |
| 662 | |
| 663 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) { | |
| 664 return oop_oop_iterate_v_m(obj, blk, mr); | |
| 665 } | |
| 666 | |
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667 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ |
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668 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ |
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669 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \ |
| 0 | 670 MemRegion mr); |
| 671 | |
| 672 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL) | |
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673 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL) |
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674 |
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675 #ifndef SERIALGC |
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676 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
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677 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); |
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678 |
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679 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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680 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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681 #endif // !SERIALGC |
| 0 | 682 |
| 683 void iterate_static_fields(OopClosure* closure); | |
| 684 void iterate_static_fields(OopClosure* closure, MemRegion mr); | |
| 685 | |
| 686 private: | |
| 687 // initialization state | |
| 688 #ifdef ASSERT | |
| 689 void set_init_state(ClassState state); | |
| 690 #else | |
| 691 void set_init_state(ClassState state) { _init_state = state; } | |
| 692 #endif | |
| 693 void set_rewritten() { _rewritten = true; } | |
| 694 void set_init_thread(Thread *thread) { _init_thread = thread; } | |
| 695 | |
| 696 u2 idnum_allocated_count() const { return _idnum_allocated_count; } | |
| 697 jmethodID* methods_jmethod_ids_acquire() const | |
| 698 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); } | |
| 699 void release_set_methods_jmethod_ids(jmethodID* jmeths) | |
| 700 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); } | |
| 701 | |
| 702 int* methods_cached_itable_indices_acquire() const | |
| 703 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); } | |
| 704 void release_set_methods_cached_itable_indices(int* indices) | |
| 705 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); } | |
| 706 | |
| 707 inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos); | |
| 708 void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); } | |
| 709 void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p); | |
| 710 | |
| 711 // Offsets for memory management | |
| 712 oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;} | |
| 713 oop* adr_methods() const { return (oop*)&this->_methods;} | |
| 714 oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;} | |
| 715 oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;} | |
| 716 oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;} | |
| 717 oop* adr_fields() const { return (oop*)&this->_fields;} | |
| 718 oop* adr_constants() const { return (oop*)&this->_constants;} | |
| 719 oop* adr_class_loader() const { return (oop*)&this->_class_loader;} | |
| 720 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;} | |
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721 oop* adr_host_klass() const { return (oop*)&this->_host_klass;} |
| 0 | 722 oop* adr_signers() const { return (oop*)&this->_signers;} |
| 723 oop* adr_source_file_name() const { return (oop*)&this->_source_file_name;} | |
| 724 oop* adr_source_debug_extension() const { return (oop*)&this->_source_debug_extension;} | |
| 725 oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;} | |
| 726 oop* adr_implementors() const { return (oop*)&this->_implementors[0];} | |
| 727 oop* adr_generic_signature() const { return (oop*)&this->_generic_signature;} | |
| 728 oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;} | |
| 729 oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;} | |
| 730 oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;} | |
| 731 oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;} | |
| 732 oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;} | |
| 733 oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;} | |
| 734 oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;} | |
| 735 | |
| 736 // Static methods that are used to implement member methods where an exposed this pointer | |
| 737 // is needed due to possible GCs | |
| 738 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); | |
| 739 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); | |
| 740 static void initialize_impl (instanceKlassHandle this_oop, TRAPS); | |
| 741 static void eager_initialize_impl (instanceKlassHandle this_oop); | |
| 742 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS); | |
| 743 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS); | |
| 744 static klassOop array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS); | |
| 745 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS); | |
| 746 /* jni_id_for_impl for jfieldID only */ | |
| 747 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset); | |
| 748 | |
| 749 // Returns the array class for the n'th dimension | |
| 750 klassOop array_klass_impl(bool or_null, int n, TRAPS); | |
| 751 | |
| 752 // Returns the array class with this class as element type | |
| 753 klassOop array_klass_impl(bool or_null, TRAPS); | |
| 754 | |
| 755 public: | |
| 756 // sharing support | |
| 757 virtual void remove_unshareable_info(); | |
| 758 void field_names_and_sigs_iterate(OopClosure* closure); | |
| 759 | |
| 760 // jvm support | |
| 761 jint compute_modifier_flags(TRAPS) const; | |
| 762 | |
| 763 public: | |
| 764 // JVMTI support | |
| 765 jint jvmti_class_status() const; | |
| 766 | |
| 767 #ifndef PRODUCT | |
| 768 public: | |
| 769 // Printing | |
| 770 void oop_print_on (oop obj, outputStream* st); | |
| 771 void oop_print_value_on(oop obj, outputStream* st); | |
| 772 | |
| 773 void print_dependent_nmethods(bool verbose = false); | |
| 774 bool is_dependent_nmethod(nmethod* nm); | |
| 775 #endif | |
| 776 | |
| 777 public: | |
| 778 // Verification | |
| 779 const char* internal_name() const; | |
| 780 void oop_verify_on(oop obj, outputStream* st); | |
| 781 | |
| 782 #ifndef PRODUCT | |
| 783 static void verify_class_klass_nonstatic_oop_maps(klassOop k) PRODUCT_RETURN; | |
| 784 #endif | |
| 785 }; | |
| 786 | |
| 787 inline methodOop instanceKlass::method_at_vtable(int index) { | |
| 788 #ifndef PRODUCT | |
| 789 assert(index >= 0, "valid vtable index"); | |
| 790 if (DebugVtables) { | |
| 791 verify_vtable_index(index); | |
| 792 } | |
| 793 #endif | |
| 794 vtableEntry* ve = (vtableEntry*)start_of_vtable(); | |
| 795 return ve[index].method(); | |
| 796 } | |
| 797 | |
| 798 inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) { | |
| 799 if (annos == NULL || annos->length() <= idnum) { | |
| 800 return NULL; | |
| 801 } | |
| 802 return typeArrayOop(annos->obj_at(idnum)); | |
| 803 } | |
| 804 | |
| 805 // for adding methods | |
| 806 // UNSET_IDNUM return means no more ids available | |
| 807 inline u2 instanceKlass::next_method_idnum() { | |
| 808 if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) { | |
| 809 return constMethodOopDesc::UNSET_IDNUM; // no more ids available | |
| 810 } else { | |
| 811 return _idnum_allocated_count++; | |
| 812 } | |
| 813 } | |
| 814 | |
| 815 | |
| 816 // ValueObjs embedded in klass. Describes where oops are located in instances of this klass. | |
| 817 | |
| 818 class OopMapBlock VALUE_OBJ_CLASS_SPEC { | |
| 819 private: | |
| 820 jushort _offset; // Offset of first oop in oop-map block | |
| 821 jushort _length; // Length of oop-map block | |
| 822 public: | |
| 823 // Accessors | |
| 824 jushort offset() const { return _offset; } | |
| 825 void set_offset(jushort offset) { _offset = offset; } | |
| 826 | |
| 827 jushort length() const { return _length; } | |
| 828 void set_length(jushort length) { _length = length; } | |
| 829 }; | |
| 830 | |
| 831 /* JNIid class for jfieldIDs only */ | |
| 832 class JNIid: public CHeapObj { | |
| 833 friend class VMStructs; | |
| 834 private: | |
| 835 klassOop _holder; | |
| 836 JNIid* _next; | |
| 837 int _offset; | |
| 838 #ifdef ASSERT | |
| 839 bool _is_static_field_id; | |
| 840 #endif | |
| 841 | |
| 842 public: | |
| 843 // Accessors | |
| 844 klassOop holder() const { return _holder; } | |
| 845 int offset() const { return _offset; } | |
| 846 JNIid* next() { return _next; } | |
| 847 // Constructor | |
| 848 JNIid(klassOop holder, int offset, JNIid* next); | |
| 849 // Identifier lookup | |
| 850 JNIid* find(int offset); | |
| 851 | |
| 852 // Garbage collection support | |
| 853 oop* holder_addr() { return (oop*)&_holder; } | |
| 854 void oops_do(OopClosure* f); | |
| 855 static void deallocate(JNIid* id); | |
| 856 // Debugging | |
| 857 #ifdef ASSERT | |
| 858 bool is_static_field_id() const { return _is_static_field_id; } | |
| 859 void set_is_static_field_id() { _is_static_field_id = true; } | |
| 860 #endif | |
| 861 void verify(klassOop holder); | |
| 862 }; | |
| 863 | |
| 864 | |
| 865 // If breakpoints are more numerous than just JVMTI breakpoints, | |
| 866 // consider compressing this data structure. | |
| 867 // It is currently a simple linked list defined in methodOop.hpp. | |
| 868 | |
| 869 class BreakpointInfo; | |
| 870 | |
| 871 | |
| 872 // A collection point for interesting information about the previous | |
| 873 // version(s) of an instanceKlass. This class uses weak references to | |
| 874 // the information so that the information may be collected as needed | |
|
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875 // by the system. If the information is shared, then a regular |
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876 // reference must be used because a weak reference would be seen as |
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877 // collectible. A GrowableArray of PreviousVersionNodes is attached |
| 0 | 878 // to the instanceKlass as needed. See PreviousVersionWalker below. |
| 879 class PreviousVersionNode : public CHeapObj { | |
| 880 private: | |
|
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881 // A shared ConstantPool is never collected so we'll always have |
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882 // a reference to it so we can update items in the cache. We'll |
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883 // have a weak reference to a non-shared ConstantPool until all |
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884 // of the methods (EMCP or obsolete) have been collected; the |
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885 // non-shared ConstantPool becomes collectible at that point. |
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886 jobject _prev_constant_pool; // regular or weak reference |
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887 bool _prev_cp_is_weak; // true if not a shared ConstantPool |
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888 |
| 0 | 889 // If the previous version of the instanceKlass doesn't have any |
| 890 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the | |
| 891 // EMCP methods have been collected, then _prev_EMCP_methods can | |
| 892 // have a length of zero. | |
| 893 GrowableArray<jweak>* _prev_EMCP_methods; | |
| 894 | |
| 895 public: | |
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896 PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak, |
| 0 | 897 GrowableArray<jweak>* prev_EMCP_methods); |
| 898 ~PreviousVersionNode(); | |
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899 jobject prev_constant_pool() const { |
| 0 | 900 return _prev_constant_pool; |
| 901 } | |
| 902 GrowableArray<jweak>* prev_EMCP_methods() const { | |
| 903 return _prev_EMCP_methods; | |
| 904 } | |
| 905 }; | |
| 906 | |
| 907 | |
| 908 // A Handle-ized version of PreviousVersionNode. | |
| 909 class PreviousVersionInfo : public ResourceObj { | |
| 910 private: | |
| 911 constantPoolHandle _prev_constant_pool_handle; | |
| 912 // If the previous version of the instanceKlass doesn't have any | |
| 913 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the | |
| 914 // methods cannot be collected while we hold a handle, | |
| 915 // _prev_EMCP_methods should never have a length of zero. | |
| 916 GrowableArray<methodHandle>* _prev_EMCP_method_handles; | |
| 917 | |
| 918 public: | |
| 919 PreviousVersionInfo(PreviousVersionNode *pv_node); | |
| 920 ~PreviousVersionInfo(); | |
| 921 constantPoolHandle prev_constant_pool_handle() const { | |
| 922 return _prev_constant_pool_handle; | |
| 923 } | |
| 924 GrowableArray<methodHandle>* prev_EMCP_method_handles() const { | |
| 925 return _prev_EMCP_method_handles; | |
| 926 } | |
| 927 }; | |
| 928 | |
| 929 | |
| 930 // Helper object for walking previous versions. This helper cleans up | |
| 931 // the Handles that it allocates when the helper object is destroyed. | |
| 932 // The PreviousVersionInfo object returned by next_previous_version() | |
| 933 // is only valid until a subsequent call to next_previous_version() or | |
| 934 // the helper object is destroyed. | |
| 935 class PreviousVersionWalker : public StackObj { | |
| 936 private: | |
| 937 GrowableArray<PreviousVersionNode *>* _previous_versions; | |
| 938 int _current_index; | |
| 939 // Fields for cleaning up when we are done walking the previous versions: | |
| 940 // A HandleMark for the PreviousVersionInfo handles: | |
| 941 HandleMark _hm; | |
| 942 | |
| 943 // It would be nice to have a ResourceMark field in this helper also, | |
| 944 // but the ResourceMark code says to be careful to delete handles held | |
| 945 // in GrowableArrays _before_ deleting the GrowableArray. Since we | |
| 946 // can't guarantee the order in which the fields are destroyed, we | |
| 947 // have to let the creator of the PreviousVersionWalker object do | |
| 948 // the right thing. Also, adding a ResourceMark here causes an | |
| 949 // include loop. | |
| 950 | |
| 951 // A pointer to the current info object so we can handle the deletes. | |
| 952 PreviousVersionInfo * _current_p; | |
| 953 | |
| 954 public: | |
| 955 PreviousVersionWalker(instanceKlass *ik); | |
| 956 ~PreviousVersionWalker(); | |
| 957 | |
| 958 // Return the interesting information for the next previous version | |
| 959 // of the klass. Returns NULL if there are no more previous versions. | |
| 960 PreviousVersionInfo* next_previous_version(); | |
| 961 }; |