Mercurial > hg > truffle
annotate src/share/vm/oops/instanceKlass.hpp @ 939:9eebd3ac74cf
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Reviewed-by: jmasa, iveresov
| author | jcoomes |
|---|---|
| date | Thu, 13 Aug 2009 16:22:45 -0700 |
| parents | b37c246bf7ce |
| children | 26b774d693aa |
| rev | line source |
|---|---|
| 0 | 1 /* |
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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 // 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 JNIid; | |
| 75 class jniIdMapBase; | |
| 76 class BreakpointInfo; | |
| 77 class fieldDescriptor; | |
| 78 class DepChange; | |
| 79 class nmethodBucket; | |
| 80 class PreviousVersionNode; | |
| 81 class JvmtiCachedClassFieldMap; | |
| 82 | |
| 83 // This is used in iterators below. | |
| 84 class FieldClosure: public StackObj { | |
| 85 public: | |
| 86 virtual void do_field(fieldDescriptor* fd) = 0; | |
| 87 }; | |
| 88 | |
| 89 #ifndef PRODUCT | |
| 90 // Print fields. | |
| 91 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. | |
| 92 class FieldPrinter: public FieldClosure { | |
| 93 oop _obj; | |
| 94 outputStream* _st; | |
| 95 public: | |
| 96 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} | |
| 97 void do_field(fieldDescriptor* fd); | |
| 98 }; | |
| 99 #endif // !PRODUCT | |
| 100 | |
| 938 | 101 // ValueObjs embedded in klass. Describes where oops are located in instances of |
| 102 // this klass. | |
| 103 class OopMapBlock VALUE_OBJ_CLASS_SPEC { | |
| 104 public: | |
| 105 // Byte offset of the first oop mapped by this block. | |
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106 int offset() const { return _offset; } |
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107 void set_offset(int offset) { _offset = offset; } |
| 938 | 108 |
| 109 // Number of oops in this block. | |
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110 uint count() const { return _count; } |
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111 void set_count(uint count) { _count = count; } |
| 938 | 112 |
| 113 // sizeof(OopMapBlock) in HeapWords. | |
| 114 static const int size_in_words() { | |
| 115 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >> | |
| 116 LogHeapWordSize; | |
| 117 } | |
| 118 | |
| 119 private: | |
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120 int _offset; |
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121 uint _count; |
| 938 | 122 }; |
| 123 | |
| 0 | 124 class instanceKlass: public Klass { |
| 125 friend class VMStructs; | |
| 126 public: | |
| 127 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description | |
| 128 // of the class loading & initialization procedure, and the use of the states. | |
| 129 enum ClassState { | |
| 130 unparsable_by_gc = 0, // object is not yet parsable by gc. Value of _init_state at object allocation. | |
| 131 allocated, // allocated (but not yet linked) | |
| 132 loaded, // loaded and inserted in class hierarchy (but not linked yet) | |
| 133 linked, // successfully linked/verified (but not initialized yet) | |
| 134 being_initialized, // currently running class initializer | |
| 135 fully_initialized, // initialized (successfull final state) | |
| 136 initialization_error // error happened during initialization | |
| 137 }; | |
| 138 | |
| 139 public: | |
| 140 oop* oop_block_beg() const { return adr_array_klasses(); } | |
| 141 oop* oop_block_end() const { return adr_methods_default_annotations() + 1; } | |
| 142 | |
| 143 enum { | |
| 144 implementors_limit = 2 // how many implems can we track? | |
| 145 }; | |
| 146 | |
| 147 protected: | |
| 148 // | |
| 149 // The oop block. See comment in klass.hpp before making changes. | |
| 150 // | |
| 151 | |
| 152 // Array classes holding elements of this class. | |
| 153 klassOop _array_klasses; | |
| 154 // Method array. | |
| 155 objArrayOop _methods; | |
| 156 // Int array containing the original order of method in the class file (for | |
| 157 // JVMTI). | |
| 158 typeArrayOop _method_ordering; | |
| 159 // Interface (klassOops) this class declares locally to implement. | |
| 160 objArrayOop _local_interfaces; | |
| 161 // Interface (klassOops) this class implements transitively. | |
| 162 objArrayOop _transitive_interfaces; | |
| 163 // Instance and static variable information, 5-tuples of shorts [access, name | |
| 164 // index, sig index, initval index, offset]. | |
| 165 typeArrayOop _fields; | |
| 166 // Constant pool for this class. | |
| 167 constantPoolOop _constants; | |
| 168 // Class loader used to load this class, NULL if VM loader used. | |
| 169 oop _class_loader; | |
| 170 // Protection domain. | |
| 171 oop _protection_domain; | |
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172 // Host class, which grants its access privileges to this class also. |
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173 // This is only non-null for an anonymous class (AnonymousClasses enabled). |
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174 // The host class is either named, or a previously loaded anonymous class. |
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175 klassOop _host_klass; |
| 0 | 176 // Class signers. |
| 177 objArrayOop _signers; | |
| 178 // Name of source file containing this klass, NULL if not specified. | |
| 179 symbolOop _source_file_name; | |
| 180 // the source debug extension for this klass, NULL if not specified. | |
| 181 symbolOop _source_debug_extension; | |
| 182 // inner_classes attribute. | |
| 183 typeArrayOop _inner_classes; | |
| 184 // Implementors of this interface (not valid if it overflows) | |
| 185 klassOop _implementors[implementors_limit]; | |
| 186 // Generic signature, or null if none. | |
| 187 symbolOop _generic_signature; | |
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188 // invokedynamic bootstrap method (a java.dyn.MethodHandle) |
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189 oop _bootstrap_method; |
| 0 | 190 // Annotations for this class, or null if none. |
| 191 typeArrayOop _class_annotations; | |
| 192 // Annotation objects (byte arrays) for fields, or null if no annotations. | |
| 193 // Indices correspond to entries (not indices) in fields array. | |
| 194 objArrayOop _fields_annotations; | |
| 195 // Annotation objects (byte arrays) for methods, or null if no annotations. | |
| 196 // Index is the idnum, which is initially the same as the methods array index. | |
| 197 objArrayOop _methods_annotations; | |
| 198 // Annotation objects (byte arrays) for methods' parameters, or null if no | |
| 199 // such annotations. | |
| 200 // Index is the idnum, which is initially the same as the methods array index. | |
| 201 objArrayOop _methods_parameter_annotations; | |
| 202 // Annotation objects (byte arrays) for methods' default values, or null if no | |
| 203 // such annotations. | |
| 204 // Index is the idnum, which is initially the same as the methods array index. | |
| 205 objArrayOop _methods_default_annotations; | |
| 206 | |
| 207 // | |
| 208 // End of the oop block. | |
| 209 // | |
| 210 | |
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211 // Number of heapOopSize words used by non-static fields in this klass |
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212 // (including inherited fields but after header_size()). |
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213 int _nonstatic_field_size; |
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214 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass |
| 0 | 215 int _static_oop_field_size;// number of static oop fields in this klass |
| 938 | 216 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks |
| 0 | 217 bool _is_marked_dependent; // used for marking during flushing and deoptimization |
| 218 bool _rewritten; // methods rewritten. | |
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219 bool _has_nonstatic_fields; // for sizing with UseCompressedOops |
| 0 | 220 u2 _minor_version; // minor version number of class file |
| 221 u2 _major_version; // major version number of class file | |
| 222 ClassState _init_state; // state of class | |
| 223 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) | |
| 224 int _vtable_len; // length of Java vtable (in words) | |
| 225 int _itable_len; // length of Java itable (in words) | |
| 226 ReferenceType _reference_type; // reference type | |
| 227 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) | |
| 228 JNIid* _jni_ids; // First JNI identifier for static fields in this class | |
| 229 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none | |
| 230 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL | |
| 231 nmethodBucket* _dependencies; // list of dependent nmethods | |
| 232 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class | |
| 233 BreakpointInfo* _breakpoints; // bpt lists, managed by methodOop | |
| 234 int _nof_implementors; // No of implementors of this interface (zero if not an interface) | |
| 235 // Array of interesting part(s) of the previous version(s) of this | |
| 236 // instanceKlass. See PreviousVersionWalker below. | |
| 237 GrowableArray<PreviousVersionNode *>* _previous_versions; | |
| 238 u2 _enclosing_method_class_index; // Constant pool index for class of enclosing method, or 0 if none | |
| 239 u2 _enclosing_method_method_index; // Constant pool index for name and type of enclosing method, or 0 if none | |
| 240 // JVMTI fields can be moved to their own structure - see 6315920 | |
| 241 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH | |
| 242 jint _cached_class_file_len; // JVMTI: length of above | |
| 243 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration | |
| 244 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change | |
| 245 | |
| 246 // embedded Java vtable follows here | |
| 247 // embedded Java itables follows here | |
| 248 // embedded static fields follows here | |
| 249 // embedded nonstatic oop-map blocks follows here | |
| 250 | |
| 251 friend class instanceKlassKlass; | |
| 252 friend class SystemDictionary; | |
| 253 | |
| 254 public: | |
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255 bool has_nonstatic_fields() const { return _has_nonstatic_fields; } |
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256 void set_has_nonstatic_fields(bool b) { _has_nonstatic_fields = b; } |
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257 |
| 0 | 258 // field sizes |
| 259 int nonstatic_field_size() const { return _nonstatic_field_size; } | |
| 260 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } | |
| 261 | |
| 262 int static_field_size() const { return _static_field_size; } | |
| 263 void set_static_field_size(int size) { _static_field_size = size; } | |
| 264 | |
| 265 int static_oop_field_size() const { return _static_oop_field_size; } | |
| 266 void set_static_oop_field_size(int size) { _static_oop_field_size = size; } | |
| 267 | |
| 268 // Java vtable | |
| 269 int vtable_length() const { return _vtable_len; } | |
| 270 void set_vtable_length(int len) { _vtable_len = len; } | |
| 271 | |
| 272 // Java itable | |
| 273 int itable_length() const { return _itable_len; } | |
| 274 void set_itable_length(int len) { _itable_len = len; } | |
| 275 | |
| 276 // array klasses | |
| 277 klassOop array_klasses() const { return _array_klasses; } | |
| 278 void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); } | |
| 279 | |
| 280 // methods | |
| 281 objArrayOop methods() const { return _methods; } | |
| 282 void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); } | |
| 283 methodOop method_with_idnum(int idnum); | |
| 284 | |
| 285 // method ordering | |
| 286 typeArrayOop method_ordering() const { return _method_ordering; } | |
| 287 void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); } | |
| 288 | |
| 289 // interfaces | |
| 290 objArrayOop local_interfaces() const { return _local_interfaces; } | |
| 291 void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); } | |
| 292 objArrayOop transitive_interfaces() const { return _transitive_interfaces; } | |
| 293 void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); } | |
| 294 | |
| 295 // fields | |
| 296 // Field info extracted from the class file and stored | |
| 297 // as an array of 7 shorts | |
| 298 enum FieldOffset { | |
| 299 access_flags_offset = 0, | |
| 300 name_index_offset = 1, | |
| 301 signature_index_offset = 2, | |
| 302 initval_index_offset = 3, | |
| 303 low_offset = 4, | |
| 304 high_offset = 5, | |
| 305 generic_signature_offset = 6, | |
| 306 next_offset = 7 | |
| 307 }; | |
| 308 | |
| 309 typeArrayOop fields() const { return _fields; } | |
| 310 int offset_from_fields( int index ) const { | |
| 311 return build_int_from_shorts( fields()->ushort_at(index + low_offset), | |
| 312 fields()->ushort_at(index + high_offset) ); | |
| 313 } | |
| 314 | |
| 315 void set_fields(typeArrayOop f) { oop_store_without_check((oop*) &_fields, (oop) f); } | |
| 316 | |
| 317 // inner classes | |
| 318 typeArrayOop inner_classes() const { return _inner_classes; } | |
| 319 void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) f); } | |
| 320 | |
| 321 enum InnerClassAttributeOffset { | |
| 322 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 | |
| 323 inner_class_inner_class_info_offset = 0, | |
| 324 inner_class_outer_class_info_offset = 1, | |
| 325 inner_class_inner_name_offset = 2, | |
| 326 inner_class_access_flags_offset = 3, | |
| 327 inner_class_next_offset = 4 | |
| 328 }; | |
| 329 | |
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330 // method override check |
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331 bool is_override(methodHandle super_method, Handle targetclassloader, symbolHandle targetclassname, TRAPS); |
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332 |
| 0 | 333 // package |
| 334 bool is_same_class_package(klassOop class2); | |
| 335 bool is_same_class_package(oop classloader2, symbolOop classname2); | |
| 336 static bool is_same_class_package(oop class_loader1, symbolOop class_name1, oop class_loader2, symbolOop class_name2); | |
| 337 | |
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338 // find an enclosing class (defined where original code was, in jvm.cpp!) |
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339 klassOop compute_enclosing_class(symbolOop& simple_name_result, TRAPS) { |
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340 instanceKlassHandle self(THREAD, this->as_klassOop()); |
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341 return compute_enclosing_class_impl(self, simple_name_result, THREAD); |
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342 } |
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343 static klassOop compute_enclosing_class_impl(instanceKlassHandle self, |
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344 symbolOop& simple_name_result, TRAPS); |
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345 |
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346 // tell if two classes have the same enclosing class (at package level) |
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347 bool is_same_package_member(klassOop class2, TRAPS) { |
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348 instanceKlassHandle self(THREAD, this->as_klassOop()); |
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349 return is_same_package_member_impl(self, class2, THREAD); |
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350 } |
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351 static bool is_same_package_member_impl(instanceKlassHandle self, |
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352 klassOop class2, TRAPS); |
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353 |
| 0 | 354 // initialization state |
| 355 bool is_loaded() const { return _init_state >= loaded; } | |
| 356 bool is_linked() const { return _init_state >= linked; } | |
| 357 bool is_initialized() const { return _init_state == fully_initialized; } | |
| 358 bool is_not_initialized() const { return _init_state < being_initialized; } | |
| 359 bool is_being_initialized() const { return _init_state == being_initialized; } | |
| 360 bool is_in_error_state() const { return _init_state == initialization_error; } | |
| 361 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } | |
| 362 int get_init_state() { return _init_state; } // Useful for debugging | |
| 363 bool is_rewritten() const { return _rewritten; } | |
| 364 | |
| 365 // marking | |
| 366 bool is_marked_dependent() const { return _is_marked_dependent; } | |
| 367 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } | |
| 368 | |
| 369 // initialization (virtuals from Klass) | |
| 370 bool should_be_initialized() const; // means that initialize should be called | |
| 371 void initialize(TRAPS); | |
| 372 void link_class(TRAPS); | |
| 373 bool link_class_or_fail(TRAPS); // returns false on failure | |
| 374 void unlink_class(); | |
| 375 void rewrite_class(TRAPS); | |
| 376 methodOop class_initializer(); | |
| 377 | |
| 378 // set the class to initialized if no static initializer is present | |
| 379 void eager_initialize(Thread *thread); | |
| 380 | |
| 381 // reference type | |
| 382 ReferenceType reference_type() const { return _reference_type; } | |
| 383 void set_reference_type(ReferenceType t) { _reference_type = t; } | |
| 384 | |
| 385 // find local field, returns true if found | |
| 386 bool find_local_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const; | |
| 387 // find field in direct superinterfaces, returns the interface in which the field is defined | |
| 388 klassOop find_interface_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const; | |
| 389 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined | |
| 390 klassOop find_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const; | |
| 391 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined | |
| 392 klassOop find_field(symbolOop name, symbolOop sig, bool is_static, fieldDescriptor* fd) const; | |
| 393 | |
| 394 // find a non-static or static field given its offset within the class. | |
| 395 bool contains_field_offset(int offset) { | |
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396 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); |
| 0 | 397 } |
| 398 | |
| 399 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; | |
| 400 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; | |
| 401 | |
| 402 // find a local method (returns NULL if not found) | |
| 403 methodOop find_method(symbolOop name, symbolOop signature) const; | |
| 404 static methodOop find_method(objArrayOop methods, symbolOop name, symbolOop signature); | |
| 405 | |
| 406 // lookup operation (returns NULL if not found) | |
| 407 methodOop uncached_lookup_method(symbolOop name, symbolOop signature) const; | |
| 408 | |
| 409 // lookup a method in all the interfaces that this class implements | |
| 410 // (returns NULL if not found) | |
| 411 methodOop lookup_method_in_all_interfaces(symbolOop name, symbolOop signature) const; | |
| 412 | |
| 413 // constant pool | |
| 414 constantPoolOop constants() const { return _constants; } | |
| 415 void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); } | |
| 416 | |
| 417 // class loader | |
| 418 oop class_loader() const { return _class_loader; } | |
| 419 void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); } | |
| 420 | |
| 421 // protection domain | |
| 422 oop protection_domain() { return _protection_domain; } | |
| 423 void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); } | |
| 424 | |
|
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425 // host class |
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426 oop host_klass() const { return _host_klass; } |
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427 void set_host_klass(oop host) { oop_store((oop*) &_host_klass, host); } |
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428 bool is_anonymous() const { return _host_klass != NULL; } |
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429 |
| 0 | 430 // signers |
| 431 objArrayOop signers() const { return _signers; } | |
| 432 void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); } | |
| 433 | |
| 434 // source file name | |
| 435 symbolOop source_file_name() const { return _source_file_name; } | |
| 436 void set_source_file_name(symbolOop n) { oop_store_without_check((oop*) &_source_file_name, (oop) n); } | |
| 437 | |
| 438 // minor and major version numbers of class file | |
| 439 u2 minor_version() const { return _minor_version; } | |
| 440 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } | |
| 441 u2 major_version() const { return _major_version; } | |
| 442 void set_major_version(u2 major_version) { _major_version = major_version; } | |
| 443 | |
| 444 // source debug extension | |
| 445 symbolOop source_debug_extension() const { return _source_debug_extension; } | |
| 446 void set_source_debug_extension(symbolOop n){ oop_store_without_check((oop*) &_source_debug_extension, (oop) n); } | |
| 447 | |
| 448 // nonstatic oop-map blocks | |
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449 static int nonstatic_oop_map_size(unsigned int oop_map_count) { |
| 938 | 450 return oop_map_count * OopMapBlock::size_in_words(); |
| 451 } | |
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452 unsigned int nonstatic_oop_map_count() const { |
| 938 | 453 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); |
| 454 } | |
| 455 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } | |
| 456 void set_nonstatic_oop_map_size(int words) { | |
| 457 _nonstatic_oop_map_size = words; | |
| 458 } | |
| 0 | 459 |
| 460 // RedefineClasses() support for previous versions: | |
| 461 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods, | |
| 462 int emcp_method_count); | |
| 463 bool has_previous_version() const; | |
| 464 void init_previous_versions() { | |
| 465 _previous_versions = NULL; | |
| 466 } | |
| 467 GrowableArray<PreviousVersionNode *>* previous_versions() const { | |
| 468 return _previous_versions; | |
| 469 } | |
| 470 | |
| 471 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation | |
| 472 void set_cached_class_file(unsigned char *class_file_bytes, | |
| 473 jint class_file_len) { _cached_class_file_len = class_file_len; | |
| 474 _cached_class_file_bytes = class_file_bytes; } | |
| 475 jint get_cached_class_file_len() { return _cached_class_file_len; } | |
| 476 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; } | |
| 477 | |
| 478 // JVMTI: Support for caching of field indices, types, and offsets | |
| 479 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { | |
| 480 _jvmti_cached_class_field_map = descriptor; | |
| 481 } | |
| 482 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { | |
| 483 return _jvmti_cached_class_field_map; | |
| 484 } | |
| 485 | |
| 486 // for adding methods, constMethodOopDesc::UNSET_IDNUM means no more ids available | |
| 487 inline u2 next_method_idnum(); | |
| 488 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } | |
| 489 | |
| 490 // generics support | |
| 491 symbolOop generic_signature() const { return _generic_signature; } | |
| 492 void set_generic_signature(symbolOop sig) { oop_store_without_check((oop*)&_generic_signature, (oop)sig); } | |
| 493 u2 enclosing_method_class_index() const { return _enclosing_method_class_index; } | |
| 494 u2 enclosing_method_method_index() const { return _enclosing_method_method_index; } | |
| 495 void set_enclosing_method_indices(u2 class_index, | |
| 496 u2 method_index) { _enclosing_method_class_index = class_index; | |
| 497 _enclosing_method_method_index = method_index; } | |
| 498 | |
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499 // JSR 292 support |
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500 oop bootstrap_method() const { return _bootstrap_method; } |
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501 void set_bootstrap_method(oop mh) { oop_store(&_bootstrap_method, mh); } |
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502 |
| 0 | 503 // jmethodID support |
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504 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, size_t idnum, |
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505 jmethodID new_id, jmethodID* new_jmeths); |
| 0 | 506 static jmethodID jmethod_id_for_impl(instanceKlassHandle ik_h, methodHandle method_h); |
| 507 jmethodID jmethod_id_or_null(methodOop method); | |
| 508 | |
| 509 // cached itable index support | |
| 510 void set_cached_itable_index(size_t idnum, int index); | |
| 511 int cached_itable_index(size_t idnum); | |
| 512 | |
| 513 // annotations support | |
| 514 typeArrayOop class_annotations() const { return _class_annotations; } | |
| 515 objArrayOop fields_annotations() const { return _fields_annotations; } | |
| 516 objArrayOop methods_annotations() const { return _methods_annotations; } | |
| 517 objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; } | |
| 518 objArrayOop methods_default_annotations() const { return _methods_default_annotations; } | |
| 519 void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); } | |
| 520 void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); } | |
| 521 void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); } | |
| 522 void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); } | |
| 523 void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); } | |
| 524 typeArrayOop get_method_annotations_of(int idnum) | |
| 525 { return get_method_annotations_from(idnum, _methods_annotations); } | |
| 526 typeArrayOop get_method_parameter_annotations_of(int idnum) | |
| 527 { return get_method_annotations_from(idnum, _methods_parameter_annotations); } | |
| 528 typeArrayOop get_method_default_annotations_of(int idnum) | |
| 529 { return get_method_annotations_from(idnum, _methods_default_annotations); } | |
| 530 void set_method_annotations_of(int idnum, typeArrayOop anno) | |
| 531 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } | |
| 532 void set_method_parameter_annotations_of(int idnum, typeArrayOop anno) | |
| 533 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } | |
| 534 void set_method_default_annotations_of(int idnum, typeArrayOop anno) | |
| 535 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } | |
| 536 | |
| 537 // allocation | |
| 538 DEFINE_ALLOCATE_PERMANENT(instanceKlass); | |
| 539 instanceOop allocate_instance(TRAPS); | |
| 540 instanceOop allocate_permanent_instance(TRAPS); | |
| 541 | |
| 542 // additional member function to return a handle | |
| 543 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } | |
| 544 | |
| 545 objArrayOop allocate_objArray(int n, int length, TRAPS); | |
| 546 // Helper function | |
| 547 static instanceOop register_finalizer(instanceOop i, TRAPS); | |
| 548 | |
| 549 // Check whether reflection/jni/jvm code is allowed to instantiate this class; | |
| 550 // if not, throw either an Error or an Exception. | |
| 551 virtual void check_valid_for_instantiation(bool throwError, TRAPS); | |
| 552 | |
| 553 // initialization | |
| 554 void call_class_initializer(TRAPS); | |
| 555 void set_initialization_state_and_notify(ClassState state, TRAPS); | |
| 556 | |
| 557 // OopMapCache support | |
| 558 OopMapCache* oop_map_cache() { return _oop_map_cache; } | |
| 559 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } | |
| 560 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry); | |
| 561 | |
| 562 // JNI identifier support (for static fields - for jni performance) | |
| 563 JNIid* jni_ids() { return _jni_ids; } | |
| 564 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } | |
| 565 JNIid* jni_id_for(int offset); | |
| 566 | |
| 567 // maintenance of deoptimization dependencies | |
| 568 int mark_dependent_nmethods(DepChange& changes); | |
| 569 void add_dependent_nmethod(nmethod* nm); | |
| 570 void remove_dependent_nmethod(nmethod* nm); | |
| 571 | |
| 572 // On-stack replacement support | |
| 573 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; | |
| 574 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; | |
| 575 void add_osr_nmethod(nmethod* n); | |
| 576 void remove_osr_nmethod(nmethod* n); | |
| 577 nmethod* lookup_osr_nmethod(const methodOop m, int bci) const; | |
| 578 | |
| 579 // Breakpoint support (see methods on methodOop for details) | |
| 580 BreakpointInfo* breakpoints() const { return _breakpoints; }; | |
| 581 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; | |
| 582 | |
| 583 // support for stub routines | |
| 584 static int init_state_offset_in_bytes() { return offset_of(instanceKlass, _init_state); } | |
| 585 static int init_thread_offset_in_bytes() { return offset_of(instanceKlass, _init_thread); } | |
| 586 | |
| 587 // subclass/subinterface checks | |
| 588 bool implements_interface(klassOop k) const; | |
| 589 | |
| 590 // Access to implementors of an interface. We only store the count | |
| 591 // of implementors, and in case, there are only a few | |
| 592 // implementors, we store them in a short list. | |
| 593 // This accessor returns NULL if we walk off the end of the list. | |
| 594 klassOop implementor(int i) const { | |
| 595 return (i < implementors_limit)? _implementors[i]: (klassOop) NULL; | |
| 596 } | |
| 597 int nof_implementors() const { return _nof_implementors; } | |
| 598 void add_implementor(klassOop k); // k is a new class that implements this interface | |
| 599 void init_implementor(); // initialize | |
| 600 | |
| 601 // link this class into the implementors list of every interface it implements | |
| 602 void process_interfaces(Thread *thread); | |
| 603 | |
| 604 // virtual operations from Klass | |
| 605 bool is_leaf_class() const { return _subklass == NULL; } | |
| 606 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS); | |
| 607 bool compute_is_subtype_of(klassOop k); | |
| 608 bool can_be_primary_super_slow() const; | |
| 609 klassOop java_super() const { return super(); } | |
| 610 int oop_size(oop obj) const { return size_helper(); } | |
| 611 int klass_oop_size() const { return object_size(); } | |
| 612 bool oop_is_instance_slow() const { return true; } | |
| 613 | |
| 614 // Iterators | |
| 615 void do_local_static_fields(FieldClosure* cl); | |
| 616 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields | |
| 617 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS); | |
| 618 | |
| 619 void methods_do(void f(methodOop method)); | |
| 620 void array_klasses_do(void f(klassOop k)); | |
| 621 void with_array_klasses_do(void f(klassOop k)); | |
| 622 bool super_types_do(SuperTypeClosure* blk); | |
| 623 | |
| 624 // Casting from klassOop | |
| 625 static instanceKlass* cast(klassOop k) { | |
| 626 Klass* kp = k->klass_part(); | |
| 627 assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass"); | |
| 628 return (instanceKlass*) kp; | |
| 629 } | |
| 630 | |
| 631 // Sizing (in words) | |
| 632 static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); } | |
| 633 int object_size() const { return object_size(align_object_offset(vtable_length()) + align_object_offset(itable_length()) + static_field_size() + nonstatic_oop_map_size()); } | |
| 634 static int vtable_start_offset() { return header_size(); } | |
| 635 static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; } | |
| 636 static int object_size(int extra) { return align_object_size(header_size() + extra); } | |
| 637 | |
| 638 intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + vtable_start_offset(); } | |
| 639 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); } | |
| 640 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)as_klassOop(); } | |
| 641 | |
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642 // Static field offset is an offset into the Heap, should be converted by |
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643 // based on UseCompressedOop for traversal |
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644 HeapWord* start_of_static_fields() const { |
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645 return (HeapWord*)(start_of_itable() + align_object_offset(itable_length())); |
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646 } |
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647 |
| 0 | 648 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } |
| 649 | |
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650 int offset_of_static_fields() const { |
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651 return (intptr_t)start_of_static_fields() - (intptr_t)as_klassOop(); |
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652 } |
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653 |
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654 OopMapBlock* start_of_nonstatic_oop_maps() const { |
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655 return (OopMapBlock*) (start_of_static_fields() + static_field_size()); |
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656 } |
| 0 | 657 |
| 658 // Allocation profiling support | |
| 659 juint alloc_size() const { return _alloc_count * size_helper(); } | |
| 660 void set_alloc_size(juint n) {} | |
| 661 | |
| 662 // Use this to return the size of an instance in heap words: | |
| 663 int size_helper() const { | |
| 664 return layout_helper_to_size_helper(layout_helper()); | |
| 665 } | |
| 666 | |
| 667 // This bit is initialized in classFileParser.cpp. | |
| 668 // It is false under any of the following conditions: | |
| 669 // - the class is abstract (including any interface) | |
| 670 // - the class has a finalizer (if !RegisterFinalizersAtInit) | |
| 671 // - the class size is larger than FastAllocateSizeLimit | |
| 672 // - the class is java/lang/Class, which cannot be allocated directly | |
| 673 bool can_be_fastpath_allocated() const { | |
| 674 return !layout_helper_needs_slow_path(layout_helper()); | |
| 675 } | |
| 676 | |
| 677 // Java vtable/itable | |
| 678 klassVtable* vtable() const; // return new klassVtable wrapper | |
| 679 inline methodOop method_at_vtable(int index); | |
| 680 klassItable* itable() const; // return new klassItable wrapper | |
| 681 methodOop method_at_itable(klassOop holder, int index, TRAPS); | |
| 682 | |
| 683 // Garbage collection | |
| 684 void oop_follow_contents(oop obj); | |
| 685 void follow_static_fields(); | |
| 686 void adjust_static_fields(); | |
| 687 int oop_adjust_pointers(oop obj); | |
| 688 bool object_is_parsable() const { return _init_state != unparsable_by_gc; } | |
| 689 // Value of _init_state must be zero (unparsable_by_gc) when klass field is set. | |
| 690 | |
| 691 void follow_weak_klass_links( | |
| 692 BoolObjectClosure* is_alive, OopClosure* keep_alive); | |
| 693 void release_C_heap_structures(); | |
| 694 | |
| 695 // Parallel Scavenge and Parallel Old | |
| 696 PARALLEL_GC_DECLS | |
| 697 | |
| 698 #ifndef SERIALGC | |
| 699 // Parallel Scavenge | |
| 700 void copy_static_fields(PSPromotionManager* pm); | |
| 701 void push_static_fields(PSPromotionManager* pm); | |
| 702 | |
| 703 // Parallel Old | |
| 704 void follow_static_fields(ParCompactionManager* cm); | |
| 705 void copy_static_fields(ParCompactionManager* cm); | |
| 706 void update_static_fields(); | |
| 707 void update_static_fields(HeapWord* beg_addr, HeapWord* end_addr); | |
| 708 #endif // SERIALGC | |
| 709 | |
| 710 // Naming | |
| 711 char* signature_name() const; | |
| 712 | |
| 713 // Iterators | |
| 714 int oop_oop_iterate(oop obj, OopClosure* blk) { | |
| 715 return oop_oop_iterate_v(obj, blk); | |
| 716 } | |
| 717 | |
| 718 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) { | |
| 719 return oop_oop_iterate_v_m(obj, blk, mr); | |
| 720 } | |
| 721 | |
|
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722 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ |
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723 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ |
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724 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \ |
| 0 | 725 MemRegion mr); |
| 726 | |
| 727 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL) | |
|
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728 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL) |
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729 |
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730 #ifndef SERIALGC |
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731 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
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732 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); |
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733 |
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734 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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735 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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736 #endif // !SERIALGC |
| 0 | 737 |
| 738 void iterate_static_fields(OopClosure* closure); | |
| 739 void iterate_static_fields(OopClosure* closure, MemRegion mr); | |
| 740 | |
| 741 private: | |
| 742 // initialization state | |
| 743 #ifdef ASSERT | |
| 744 void set_init_state(ClassState state); | |
| 745 #else | |
| 746 void set_init_state(ClassState state) { _init_state = state; } | |
| 747 #endif | |
| 748 void set_rewritten() { _rewritten = true; } | |
| 749 void set_init_thread(Thread *thread) { _init_thread = thread; } | |
| 750 | |
| 751 u2 idnum_allocated_count() const { return _idnum_allocated_count; } | |
| 752 jmethodID* methods_jmethod_ids_acquire() const | |
| 753 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); } | |
| 754 void release_set_methods_jmethod_ids(jmethodID* jmeths) | |
| 755 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); } | |
| 756 | |
| 757 int* methods_cached_itable_indices_acquire() const | |
| 758 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); } | |
| 759 void release_set_methods_cached_itable_indices(int* indices) | |
| 760 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); } | |
| 761 | |
| 762 inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos); | |
| 763 void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); } | |
| 764 void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p); | |
| 765 | |
| 766 // Offsets for memory management | |
| 767 oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;} | |
| 768 oop* adr_methods() const { return (oop*)&this->_methods;} | |
| 769 oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;} | |
| 770 oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;} | |
| 771 oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;} | |
| 772 oop* adr_fields() const { return (oop*)&this->_fields;} | |
| 773 oop* adr_constants() const { return (oop*)&this->_constants;} | |
| 774 oop* adr_class_loader() const { return (oop*)&this->_class_loader;} | |
| 775 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;} | |
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776 oop* adr_host_klass() const { return (oop*)&this->_host_klass;} |
| 0 | 777 oop* adr_signers() const { return (oop*)&this->_signers;} |
| 778 oop* adr_source_file_name() const { return (oop*)&this->_source_file_name;} | |
| 779 oop* adr_source_debug_extension() const { return (oop*)&this->_source_debug_extension;} | |
| 780 oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;} | |
| 781 oop* adr_implementors() const { return (oop*)&this->_implementors[0];} | |
| 782 oop* adr_generic_signature() const { return (oop*)&this->_generic_signature;} | |
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783 oop* adr_bootstrap_method() const { return (oop*)&this->_bootstrap_method;} |
| 0 | 784 oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;} |
| 785 oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;} | |
| 786 oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;} | |
| 787 oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;} | |
| 788 oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;} | |
| 789 oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;} | |
| 790 oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;} | |
| 791 | |
| 792 // Static methods that are used to implement member methods where an exposed this pointer | |
| 793 // is needed due to possible GCs | |
| 794 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); | |
| 795 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); | |
| 796 static void initialize_impl (instanceKlassHandle this_oop, TRAPS); | |
| 797 static void eager_initialize_impl (instanceKlassHandle this_oop); | |
| 798 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS); | |
| 799 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS); | |
| 800 static klassOop array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS); | |
| 801 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS); | |
| 802 /* jni_id_for_impl for jfieldID only */ | |
| 803 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset); | |
| 804 | |
| 805 // Returns the array class for the n'th dimension | |
| 806 klassOop array_klass_impl(bool or_null, int n, TRAPS); | |
| 807 | |
| 808 // Returns the array class with this class as element type | |
| 809 klassOop array_klass_impl(bool or_null, TRAPS); | |
| 810 | |
| 811 public: | |
| 812 // sharing support | |
| 813 virtual void remove_unshareable_info(); | |
| 814 void field_names_and_sigs_iterate(OopClosure* closure); | |
| 815 | |
| 816 // jvm support | |
| 817 jint compute_modifier_flags(TRAPS) const; | |
| 818 | |
| 819 public: | |
| 820 // JVMTI support | |
| 821 jint jvmti_class_status() const; | |
| 822 | |
| 823 #ifndef PRODUCT | |
| 824 public: | |
| 825 // Printing | |
| 826 void oop_print_on (oop obj, outputStream* st); | |
| 827 void oop_print_value_on(oop obj, outputStream* st); | |
| 828 | |
| 829 void print_dependent_nmethods(bool verbose = false); | |
| 830 bool is_dependent_nmethod(nmethod* nm); | |
| 831 #endif | |
| 832 | |
| 833 public: | |
| 834 // Verification | |
| 835 const char* internal_name() const; | |
| 836 void oop_verify_on(oop obj, outputStream* st); | |
| 837 | |
| 838 #ifndef PRODUCT | |
| 839 static void verify_class_klass_nonstatic_oop_maps(klassOop k) PRODUCT_RETURN; | |
| 840 #endif | |
| 841 }; | |
| 842 | |
| 843 inline methodOop instanceKlass::method_at_vtable(int index) { | |
| 844 #ifndef PRODUCT | |
| 845 assert(index >= 0, "valid vtable index"); | |
| 846 if (DebugVtables) { | |
| 847 verify_vtable_index(index); | |
| 848 } | |
| 849 #endif | |
| 850 vtableEntry* ve = (vtableEntry*)start_of_vtable(); | |
| 851 return ve[index].method(); | |
| 852 } | |
| 853 | |
| 854 inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) { | |
| 855 if (annos == NULL || annos->length() <= idnum) { | |
| 856 return NULL; | |
| 857 } | |
| 858 return typeArrayOop(annos->obj_at(idnum)); | |
| 859 } | |
| 860 | |
| 861 // for adding methods | |
| 862 // UNSET_IDNUM return means no more ids available | |
| 863 inline u2 instanceKlass::next_method_idnum() { | |
| 864 if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) { | |
| 865 return constMethodOopDesc::UNSET_IDNUM; // no more ids available | |
| 866 } else { | |
| 867 return _idnum_allocated_count++; | |
| 868 } | |
| 869 } | |
| 870 | |
| 871 | |
| 872 /* JNIid class for jfieldIDs only */ | |
| 873 class JNIid: public CHeapObj { | |
| 874 friend class VMStructs; | |
| 875 private: | |
| 876 klassOop _holder; | |
| 877 JNIid* _next; | |
| 878 int _offset; | |
| 879 #ifdef ASSERT | |
| 880 bool _is_static_field_id; | |
| 881 #endif | |
| 882 | |
| 883 public: | |
| 884 // Accessors | |
| 885 klassOop holder() const { return _holder; } | |
| 886 int offset() const { return _offset; } | |
| 887 JNIid* next() { return _next; } | |
| 888 // Constructor | |
| 889 JNIid(klassOop holder, int offset, JNIid* next); | |
| 890 // Identifier lookup | |
| 891 JNIid* find(int offset); | |
| 892 | |
| 893 // Garbage collection support | |
| 894 oop* holder_addr() { return (oop*)&_holder; } | |
| 895 void oops_do(OopClosure* f); | |
| 896 static void deallocate(JNIid* id); | |
| 897 // Debugging | |
| 898 #ifdef ASSERT | |
| 899 bool is_static_field_id() const { return _is_static_field_id; } | |
| 900 void set_is_static_field_id() { _is_static_field_id = true; } | |
| 901 #endif | |
| 902 void verify(klassOop holder); | |
| 903 }; | |
| 904 | |
| 905 | |
| 906 // If breakpoints are more numerous than just JVMTI breakpoints, | |
| 907 // consider compressing this data structure. | |
| 908 // It is currently a simple linked list defined in methodOop.hpp. | |
| 909 | |
| 910 class BreakpointInfo; | |
| 911 | |
| 912 | |
| 913 // A collection point for interesting information about the previous | |
| 914 // version(s) of an instanceKlass. This class uses weak references to | |
| 915 // the information so that the information may be collected as needed | |
|
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916 // by the system. If the information is shared, then a regular |
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917 // reference must be used because a weak reference would be seen as |
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918 // collectible. A GrowableArray of PreviousVersionNodes is attached |
| 0 | 919 // to the instanceKlass as needed. See PreviousVersionWalker below. |
| 920 class PreviousVersionNode : public CHeapObj { | |
| 921 private: | |
|
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922 // A shared ConstantPool is never collected so we'll always have |
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923 // a reference to it so we can update items in the cache. We'll |
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924 // have a weak reference to a non-shared ConstantPool until all |
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925 // of the methods (EMCP or obsolete) have been collected; the |
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926 // non-shared ConstantPool becomes collectible at that point. |
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927 jobject _prev_constant_pool; // regular or weak reference |
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928 bool _prev_cp_is_weak; // true if not a shared ConstantPool |
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929 |
| 0 | 930 // If the previous version of the instanceKlass doesn't have any |
| 931 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the | |
| 932 // EMCP methods have been collected, then _prev_EMCP_methods can | |
| 933 // have a length of zero. | |
| 934 GrowableArray<jweak>* _prev_EMCP_methods; | |
| 935 | |
| 936 public: | |
|
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937 PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak, |
| 0 | 938 GrowableArray<jweak>* prev_EMCP_methods); |
| 939 ~PreviousVersionNode(); | |
|
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940 jobject prev_constant_pool() const { |
| 0 | 941 return _prev_constant_pool; |
| 942 } | |
| 943 GrowableArray<jweak>* prev_EMCP_methods() const { | |
| 944 return _prev_EMCP_methods; | |
| 945 } | |
| 946 }; | |
| 947 | |
| 948 | |
| 949 // A Handle-ized version of PreviousVersionNode. | |
| 950 class PreviousVersionInfo : public ResourceObj { | |
| 951 private: | |
| 952 constantPoolHandle _prev_constant_pool_handle; | |
| 953 // If the previous version of the instanceKlass doesn't have any | |
| 954 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the | |
| 955 // methods cannot be collected while we hold a handle, | |
| 956 // _prev_EMCP_methods should never have a length of zero. | |
| 957 GrowableArray<methodHandle>* _prev_EMCP_method_handles; | |
| 958 | |
| 959 public: | |
| 960 PreviousVersionInfo(PreviousVersionNode *pv_node); | |
| 961 ~PreviousVersionInfo(); | |
| 962 constantPoolHandle prev_constant_pool_handle() const { | |
| 963 return _prev_constant_pool_handle; | |
| 964 } | |
| 965 GrowableArray<methodHandle>* prev_EMCP_method_handles() const { | |
| 966 return _prev_EMCP_method_handles; | |
| 967 } | |
| 968 }; | |
| 969 | |
| 970 | |
| 971 // Helper object for walking previous versions. This helper cleans up | |
| 972 // the Handles that it allocates when the helper object is destroyed. | |
| 973 // The PreviousVersionInfo object returned by next_previous_version() | |
| 974 // is only valid until a subsequent call to next_previous_version() or | |
| 975 // the helper object is destroyed. | |
| 976 class PreviousVersionWalker : public StackObj { | |
| 977 private: | |
| 978 GrowableArray<PreviousVersionNode *>* _previous_versions; | |
| 979 int _current_index; | |
| 980 // Fields for cleaning up when we are done walking the previous versions: | |
| 981 // A HandleMark for the PreviousVersionInfo handles: | |
| 982 HandleMark _hm; | |
| 983 | |
| 984 // It would be nice to have a ResourceMark field in this helper also, | |
| 985 // but the ResourceMark code says to be careful to delete handles held | |
| 986 // in GrowableArrays _before_ deleting the GrowableArray. Since we | |
| 987 // can't guarantee the order in which the fields are destroyed, we | |
| 988 // have to let the creator of the PreviousVersionWalker object do | |
| 989 // the right thing. Also, adding a ResourceMark here causes an | |
| 990 // include loop. | |
| 991 | |
| 992 // A pointer to the current info object so we can handle the deletes. | |
| 993 PreviousVersionInfo * _current_p; | |
| 994 | |
| 995 public: | |
| 996 PreviousVersionWalker(instanceKlass *ik); | |
| 997 ~PreviousVersionWalker(); | |
| 998 | |
| 999 // Return the interesting information for the next previous version | |
| 1000 // of the klass. Returns NULL if there are no more previous versions. | |
| 1001 PreviousVersionInfo* next_previous_version(); | |
| 1002 }; |