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annotate src/share/vm/oops/instanceKlass.hpp @ 3637:ff6a991c6e3c
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| author | Thomas Wuerthinger <thomas.wuerthinger@oracle.com> |
|---|---|
| date | Wed, 16 Nov 2011 01:48:25 +0100 |
| parents | 2d4b2b833d29 |
| children | f198b24093f3 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2227 | 2 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved. |
| 0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 * | |
| 5 * This code is free software; you can redistribute it and/or modify it | |
| 6 * under the terms of the GNU General Public License version 2 only, as | |
| 7 * published by the Free Software Foundation. | |
| 8 * | |
| 9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 12 * version 2 for more details (a copy is included in the LICENSE file that | |
| 13 * accompanied this code). | |
| 14 * | |
| 15 * You should have received a copy of the GNU General Public License version | |
| 16 * 2 along with this work; if not, write to the Free Software Foundation, | |
| 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 18 * | |
|
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
| 0 | 22 * |
| 23 */ | |
| 24 | |
| 1972 | 25 #ifndef SHARE_VM_OOPS_INSTANCEKLASS_HPP |
| 26 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP | |
| 27 | |
| 28 #include "oops/constMethodOop.hpp" | |
| 29 #include "oops/constantPoolOop.hpp" | |
| 30 #include "oops/instanceOop.hpp" | |
| 31 #include "oops/klassOop.hpp" | |
| 32 #include "oops/klassVtable.hpp" | |
| 33 #include "oops/objArrayOop.hpp" | |
| 34 #include "runtime/handles.hpp" | |
| 35 #include "runtime/os.hpp" | |
| 36 #include "utilities/accessFlags.hpp" | |
| 37 #include "utilities/bitMap.inline.hpp" | |
| 38 | |
| 0 | 39 // An instanceKlass is the VM level representation of a Java class. |
| 40 // It contains all information needed for at class at execution runtime. | |
| 41 | |
| 42 // instanceKlass layout: | |
| 43 // [header ] klassOop | |
| 44 // [klass pointer ] klassOop | |
| 45 // [C++ vtbl pointer ] Klass | |
| 46 // [subtype cache ] Klass | |
| 47 // [instance size ] Klass | |
| 48 // [java mirror ] Klass | |
| 49 // [super ] Klass | |
| 50 // [access_flags ] Klass | |
| 51 // [name ] Klass | |
| 52 // [first subklass ] Klass | |
| 53 // [next sibling ] Klass | |
| 54 // [array klasses ] | |
| 55 // [methods ] | |
| 56 // [local interfaces ] | |
| 57 // [transitive interfaces ] | |
| 58 // [number of implementors ] | |
| 59 // [implementors ] klassOop[2] | |
| 60 // [fields ] | |
| 61 // [constants ] | |
| 62 // [class loader ] | |
| 63 // [protection domain ] | |
| 64 // [signers ] | |
| 65 // [source file name ] | |
| 66 // [inner classes ] | |
| 67 // [static field size ] | |
| 68 // [nonstatic field size ] | |
| 69 // [static oop fields size ] | |
| 70 // [nonstatic oop maps size ] | |
| 71 // [has finalize method ] | |
| 72 // [deoptimization mark bit ] | |
| 73 // [initialization state ] | |
| 74 // [initializing thread ] | |
| 75 // [Java vtable length ] | |
| 76 // [oop map cache (stack maps) ] | |
| 77 // [EMBEDDED Java vtable ] size in words = vtable_len | |
| 78 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size | |
| 79 // | |
| 80 // The embedded nonstatic oop-map blocks are short pairs (offset, length) indicating | |
| 81 // where oops are located in instances of this klass. | |
| 82 | |
| 83 | |
| 84 // forward declaration for class -- see below for definition | |
| 85 class SuperTypeClosure; | |
| 86 class JNIid; | |
| 87 class jniIdMapBase; | |
| 88 class BreakpointInfo; | |
| 89 class fieldDescriptor; | |
| 90 class DepChange; | |
| 91 class nmethodBucket; | |
| 92 class PreviousVersionNode; | |
| 93 class JvmtiCachedClassFieldMap; | |
| 94 | |
| 95 // This is used in iterators below. | |
| 96 class FieldClosure: public StackObj { | |
| 97 public: | |
| 98 virtual void do_field(fieldDescriptor* fd) = 0; | |
| 99 }; | |
| 100 | |
| 101 #ifndef PRODUCT | |
| 102 // Print fields. | |
| 103 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields. | |
| 104 class FieldPrinter: public FieldClosure { | |
| 105 oop _obj; | |
| 106 outputStream* _st; | |
| 107 public: | |
| 108 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {} | |
| 109 void do_field(fieldDescriptor* fd); | |
| 110 }; | |
| 111 #endif // !PRODUCT | |
| 112 | |
| 938 | 113 // ValueObjs embedded in klass. Describes where oops are located in instances of |
| 114 // this klass. | |
| 115 class OopMapBlock VALUE_OBJ_CLASS_SPEC { | |
| 116 public: | |
| 117 // Byte offset of the first oop mapped by this block. | |
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118 int offset() const { return _offset; } |
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119 void set_offset(int offset) { _offset = offset; } |
| 938 | 120 |
| 121 // Number of oops in this block. | |
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122 uint count() const { return _count; } |
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123 void set_count(uint count) { _count = count; } |
| 938 | 124 |
| 125 // sizeof(OopMapBlock) in HeapWords. | |
| 126 static const int size_in_words() { | |
| 127 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >> | |
| 128 LogHeapWordSize; | |
| 129 } | |
| 130 | |
| 131 private: | |
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132 int _offset; |
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133 uint _count; |
| 938 | 134 }; |
| 135 | |
| 0 | 136 class instanceKlass: public Klass { |
| 137 friend class VMStructs; | |
| 138 public: | |
| 139 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description | |
| 140 // of the class loading & initialization procedure, and the use of the states. | |
| 141 enum ClassState { | |
| 142 unparsable_by_gc = 0, // object is not yet parsable by gc. Value of _init_state at object allocation. | |
| 143 allocated, // allocated (but not yet linked) | |
| 144 loaded, // loaded and inserted in class hierarchy (but not linked yet) | |
| 145 linked, // successfully linked/verified (but not initialized yet) | |
| 146 being_initialized, // currently running class initializer | |
| 147 fully_initialized, // initialized (successfull final state) | |
| 148 initialization_error // error happened during initialization | |
| 149 }; | |
| 150 | |
| 151 public: | |
| 152 oop* oop_block_beg() const { return adr_array_klasses(); } | |
| 153 oop* oop_block_end() const { return adr_methods_default_annotations() + 1; } | |
| 154 | |
| 155 enum { | |
| 156 implementors_limit = 2 // how many implems can we track? | |
| 157 }; | |
| 158 | |
| 159 protected: | |
| 160 // | |
| 161 // The oop block. See comment in klass.hpp before making changes. | |
| 162 // | |
| 163 | |
| 164 // Array classes holding elements of this class. | |
| 165 klassOop _array_klasses; | |
| 166 // Method array. | |
| 167 objArrayOop _methods; | |
| 168 // Int array containing the original order of method in the class file (for | |
| 169 // JVMTI). | |
| 170 typeArrayOop _method_ordering; | |
| 171 // Interface (klassOops) this class declares locally to implement. | |
| 172 objArrayOop _local_interfaces; | |
| 173 // Interface (klassOops) this class implements transitively. | |
| 174 objArrayOop _transitive_interfaces; | |
| 175 // Instance and static variable information, 5-tuples of shorts [access, name | |
| 176 // index, sig index, initval index, offset]. | |
| 177 typeArrayOop _fields; | |
| 178 // Constant pool for this class. | |
| 179 constantPoolOop _constants; | |
| 180 // Class loader used to load this class, NULL if VM loader used. | |
| 181 oop _class_loader; | |
| 182 // Protection domain. | |
| 183 oop _protection_domain; | |
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184 // Host class, which grants its access privileges to this class also. |
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185 // This is only non-null for an anonymous class (JSR 292 enabled). |
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186 // The host class is either named, or a previously loaded anonymous class. |
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187 klassOop _host_klass; |
| 0 | 188 // Class signers. |
| 189 objArrayOop _signers; | |
| 190 // inner_classes attribute. | |
| 191 typeArrayOop _inner_classes; | |
| 192 // Implementors of this interface (not valid if it overflows) | |
| 193 klassOop _implementors[implementors_limit]; | |
| 194 // Annotations for this class, or null if none. | |
| 195 typeArrayOop _class_annotations; | |
| 196 // Annotation objects (byte arrays) for fields, or null if no annotations. | |
| 197 // Indices correspond to entries (not indices) in fields array. | |
| 198 objArrayOop _fields_annotations; | |
| 199 // Annotation objects (byte arrays) for methods, or null if no annotations. | |
| 200 // Index is the idnum, which is initially the same as the methods array index. | |
| 201 objArrayOop _methods_annotations; | |
| 202 // Annotation objects (byte arrays) for methods' parameters, 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_parameter_annotations; | |
| 206 // Annotation objects (byte arrays) for methods' default values, or null if no | |
| 207 // such annotations. | |
| 208 // Index is the idnum, which is initially the same as the methods array index. | |
| 209 objArrayOop _methods_default_annotations; | |
| 210 | |
| 211 // | |
| 212 // End of the oop block. | |
| 213 // | |
| 214 | |
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215 // Name of source file containing this klass, NULL if not specified. |
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216 Symbol* _source_file_name; |
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217 // the source debug extension for this klass, NULL if not specified. |
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218 Symbol* _source_debug_extension; |
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219 // Generic signature, or null if none. |
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220 Symbol* _generic_signature; |
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221 // Array name derived from this class which needs unreferencing |
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222 // if this class is unloaded. |
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223 Symbol* _array_name; |
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224 |
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225 // Number of heapOopSize words used by non-static fields in this klass |
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226 // (including inherited fields but after header_size()). |
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227 int _nonstatic_field_size; |
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228 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass |
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229 int _static_oop_field_count;// number of static oop fields in this klass |
| 938 | 230 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks |
| 975 | 231 bool _is_marked_dependent; // used for marking during flushing and deoptimization |
| 232 bool _rewritten; // methods rewritten. | |
| 233 bool _has_nonstatic_fields; // for sizing with UseCompressedOops | |
| 234 bool _should_verify_class; // allow caching of preverification | |
| 0 | 235 u2 _minor_version; // minor version number of class file |
| 236 u2 _major_version; // major version number of class file | |
| 237 ClassState _init_state; // state of class | |
| 238 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization) | |
| 239 int _vtable_len; // length of Java vtable (in words) | |
| 240 int _itable_len; // length of Java itable (in words) | |
| 241 ReferenceType _reference_type; // reference type | |
| 242 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily) | |
| 243 JNIid* _jni_ids; // First JNI identifier for static fields in this class | |
| 244 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none | |
| 245 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL | |
| 246 nmethodBucket* _dependencies; // list of dependent nmethods | |
| 247 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class | |
| 248 BreakpointInfo* _breakpoints; // bpt lists, managed by methodOop | |
| 249 int _nof_implementors; // No of implementors of this interface (zero if not an interface) | |
| 250 // Array of interesting part(s) of the previous version(s) of this | |
| 251 // instanceKlass. See PreviousVersionWalker below. | |
| 252 GrowableArray<PreviousVersionNode *>* _previous_versions; | |
| 253 u2 _enclosing_method_class_index; // Constant pool index for class of enclosing method, or 0 if none | |
| 254 u2 _enclosing_method_method_index; // Constant pool index for name and type of enclosing method, or 0 if none | |
| 255 // JVMTI fields can be moved to their own structure - see 6315920 | |
| 256 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH | |
| 257 jint _cached_class_file_len; // JVMTI: length of above | |
| 258 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration | |
| 259 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change | |
| 260 | |
| 261 // embedded Java vtable follows here | |
| 262 // embedded Java itables follows here | |
| 263 // embedded static fields follows here | |
| 264 // embedded nonstatic oop-map blocks follows here | |
| 265 | |
| 266 friend class instanceKlassKlass; | |
| 267 friend class SystemDictionary; | |
| 268 | |
| 269 public: | |
| 975 | 270 bool has_nonstatic_fields() const { return _has_nonstatic_fields; } |
| 271 void set_has_nonstatic_fields(bool b) { _has_nonstatic_fields = b; } | |
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272 |
| 0 | 273 // field sizes |
| 274 int nonstatic_field_size() const { return _nonstatic_field_size; } | |
| 275 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; } | |
| 276 | |
| 277 int static_field_size() const { return _static_field_size; } | |
| 278 void set_static_field_size(int size) { _static_field_size = size; } | |
| 279 | |
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280 int static_oop_field_count() const { return _static_oop_field_count; } |
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281 void set_static_oop_field_count(int size) { _static_oop_field_count = size; } |
| 0 | 282 |
| 283 // Java vtable | |
| 284 int vtable_length() const { return _vtable_len; } | |
| 285 void set_vtable_length(int len) { _vtable_len = len; } | |
| 286 | |
| 287 // Java itable | |
| 288 int itable_length() const { return _itable_len; } | |
| 289 void set_itable_length(int len) { _itable_len = len; } | |
| 290 | |
| 291 // array klasses | |
| 292 klassOop array_klasses() const { return _array_klasses; } | |
| 293 void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); } | |
| 294 | |
| 295 // methods | |
| 296 objArrayOop methods() const { return _methods; } | |
| 297 void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); } | |
| 298 methodOop method_with_idnum(int idnum); | |
| 299 | |
| 300 // method ordering | |
| 301 typeArrayOop method_ordering() const { return _method_ordering; } | |
| 302 void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); } | |
| 303 | |
| 304 // interfaces | |
| 305 objArrayOop local_interfaces() const { return _local_interfaces; } | |
| 306 void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); } | |
| 307 objArrayOop transitive_interfaces() const { return _transitive_interfaces; } | |
| 308 void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); } | |
| 309 | |
| 310 // fields | |
| 311 // Field info extracted from the class file and stored | |
| 312 // as an array of 7 shorts | |
| 313 enum FieldOffset { | |
| 314 access_flags_offset = 0, | |
| 315 name_index_offset = 1, | |
| 316 signature_index_offset = 2, | |
| 317 initval_index_offset = 3, | |
| 318 low_offset = 4, | |
| 319 high_offset = 5, | |
| 320 generic_signature_offset = 6, | |
| 321 next_offset = 7 | |
| 322 }; | |
| 323 | |
| 324 typeArrayOop fields() const { return _fields; } | |
| 325 int offset_from_fields( int index ) const { | |
| 326 return build_int_from_shorts( fields()->ushort_at(index + low_offset), | |
| 327 fields()->ushort_at(index + high_offset) ); | |
| 328 } | |
| 329 | |
| 330 void set_fields(typeArrayOop f) { oop_store_without_check((oop*) &_fields, (oop) f); } | |
| 331 | |
| 332 // inner classes | |
| 333 typeArrayOop inner_classes() const { return _inner_classes; } | |
| 334 void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) f); } | |
| 335 | |
| 336 enum InnerClassAttributeOffset { | |
| 337 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814 | |
| 338 inner_class_inner_class_info_offset = 0, | |
| 339 inner_class_outer_class_info_offset = 1, | |
| 340 inner_class_inner_name_offset = 2, | |
| 341 inner_class_access_flags_offset = 3, | |
| 342 inner_class_next_offset = 4 | |
| 343 }; | |
| 344 | |
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345 // method override check |
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346 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS); |
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347 |
| 0 | 348 // package |
| 349 bool is_same_class_package(klassOop class2); | |
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350 bool is_same_class_package(oop classloader2, Symbol* classname2); |
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351 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2); |
| 0 | 352 |
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353 // find an enclosing class (defined where original code was, in jvm.cpp!) |
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354 klassOop compute_enclosing_class(bool* inner_is_member, TRAPS) { |
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355 instanceKlassHandle self(THREAD, this->as_klassOop()); |
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356 return compute_enclosing_class_impl(self, inner_is_member, THREAD); |
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357 } |
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358 static klassOop compute_enclosing_class_impl(instanceKlassHandle self, |
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359 bool* inner_is_member, TRAPS); |
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360 |
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361 // tell if two classes have the same enclosing class (at package level) |
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362 bool is_same_package_member(klassOop class2, TRAPS) { |
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363 instanceKlassHandle self(THREAD, this->as_klassOop()); |
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364 return is_same_package_member_impl(self, class2, THREAD); |
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365 } |
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366 static bool is_same_package_member_impl(instanceKlassHandle self, |
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367 klassOop class2, TRAPS); |
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368 |
| 0 | 369 // initialization state |
| 370 bool is_loaded() const { return _init_state >= loaded; } | |
| 371 bool is_linked() const { return _init_state >= linked; } | |
| 372 bool is_initialized() const { return _init_state == fully_initialized; } | |
| 373 bool is_not_initialized() const { return _init_state < being_initialized; } | |
| 374 bool is_being_initialized() const { return _init_state == being_initialized; } | |
| 375 bool is_in_error_state() const { return _init_state == initialization_error; } | |
| 376 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; } | |
| 377 int get_init_state() { return _init_state; } // Useful for debugging | |
| 975 | 378 bool is_rewritten() const { return _rewritten; } |
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379 |
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380 // defineClass specified verification |
| 975 | 381 bool should_verify_class() const { return _should_verify_class; } |
| 382 void set_should_verify_class(bool value) { _should_verify_class = value; } | |
| 0 | 383 |
| 384 // marking | |
| 975 | 385 bool is_marked_dependent() const { return _is_marked_dependent; } |
| 386 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; } | |
| 0 | 387 |
| 388 // initialization (virtuals from Klass) | |
| 389 bool should_be_initialized() const; // means that initialize should be called | |
| 390 void initialize(TRAPS); | |
| 391 void link_class(TRAPS); | |
| 392 bool link_class_or_fail(TRAPS); // returns false on failure | |
| 393 void unlink_class(); | |
| 394 void rewrite_class(TRAPS); | |
| 3404 | 395 void relocate_and_link_methods(TRAPS); |
| 0 | 396 methodOop class_initializer(); |
| 397 | |
| 398 // set the class to initialized if no static initializer is present | |
| 399 void eager_initialize(Thread *thread); | |
| 400 | |
| 401 // reference type | |
| 402 ReferenceType reference_type() const { return _reference_type; } | |
| 403 void set_reference_type(ReferenceType t) { _reference_type = t; } | |
| 404 | |
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405 static int reference_type_offset_in_bytes() { return offset_of(instanceKlass, _reference_type); } |
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406 |
| 0 | 407 // find local field, returns true if found |
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408 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; |
| 0 | 409 // find field in direct superinterfaces, returns the interface in which the field is defined |
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410 klassOop find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; |
| 0 | 411 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined |
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412 klassOop find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const; |
| 0 | 413 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined |
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414 klassOop find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const; |
| 0 | 415 |
| 416 // find a non-static or static field given its offset within the class. | |
| 417 bool contains_field_offset(int offset) { | |
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418 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size()); |
| 0 | 419 } |
| 420 | |
| 421 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; | |
| 422 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const; | |
| 423 | |
| 424 // find a local method (returns NULL if not found) | |
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425 methodOop find_method(Symbol* name, Symbol* signature) const; |
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426 static methodOop find_method(objArrayOop methods, Symbol* name, Symbol* signature); |
| 0 | 427 |
| 428 // lookup operation (returns NULL if not found) | |
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429 methodOop uncached_lookup_method(Symbol* name, Symbol* signature) const; |
| 0 | 430 |
| 431 // lookup a method in all the interfaces that this class implements | |
| 432 // (returns NULL if not found) | |
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433 methodOop lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const; |
| 0 | 434 |
| 435 // constant pool | |
| 436 constantPoolOop constants() const { return _constants; } | |
| 437 void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); } | |
| 438 | |
| 439 // class loader | |
| 440 oop class_loader() const { return _class_loader; } | |
| 441 void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); } | |
| 442 | |
| 443 // protection domain | |
| 444 oop protection_domain() { return _protection_domain; } | |
| 445 void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); } | |
| 446 | |
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447 // host class |
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448 oop host_klass() const { return _host_klass; } |
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449 void set_host_klass(oop host) { oop_store((oop*) &_host_klass, host); } |
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450 bool is_anonymous() const { return _host_klass != NULL; } |
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451 |
| 0 | 452 // signers |
| 453 objArrayOop signers() const { return _signers; } | |
| 454 void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); } | |
| 455 | |
| 456 // source file name | |
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457 Symbol* source_file_name() const { return _source_file_name; } |
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458 void set_source_file_name(Symbol* n); |
| 0 | 459 |
| 460 // minor and major version numbers of class file | |
| 461 u2 minor_version() const { return _minor_version; } | |
| 462 void set_minor_version(u2 minor_version) { _minor_version = minor_version; } | |
| 463 u2 major_version() const { return _major_version; } | |
| 464 void set_major_version(u2 major_version) { _major_version = major_version; } | |
| 465 | |
| 466 // source debug extension | |
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467 Symbol* source_debug_extension() const { return _source_debug_extension; } |
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468 void set_source_debug_extension(Symbol* n); |
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469 |
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470 // symbol unloading support (refcount already added) |
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471 Symbol* array_name() { return _array_name; } |
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472 void set_array_name(Symbol* name) { assert(_array_name == NULL, "name already created"); _array_name = name; } |
| 0 | 473 |
| 474 // nonstatic oop-map blocks | |
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475 static int nonstatic_oop_map_size(unsigned int oop_map_count) { |
| 938 | 476 return oop_map_count * OopMapBlock::size_in_words(); |
| 477 } | |
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478 unsigned int nonstatic_oop_map_count() const { |
| 938 | 479 return _nonstatic_oop_map_size / OopMapBlock::size_in_words(); |
| 480 } | |
| 481 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; } | |
| 482 void set_nonstatic_oop_map_size(int words) { | |
| 483 _nonstatic_oop_map_size = words; | |
| 484 } | |
| 0 | 485 |
| 486 // RedefineClasses() support for previous versions: | |
| 487 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods, | |
| 488 int emcp_method_count); | |
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489 // If the _previous_versions array is non-NULL, then this klass |
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490 // has been redefined at least once even if we aren't currently |
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491 // tracking a previous version. |
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492 bool has_been_redefined() const { return _previous_versions != NULL; } |
| 0 | 493 bool has_previous_version() const; |
| 494 void init_previous_versions() { | |
| 495 _previous_versions = NULL; | |
| 496 } | |
| 497 GrowableArray<PreviousVersionNode *>* previous_versions() const { | |
| 498 return _previous_versions; | |
| 499 } | |
| 500 | |
| 501 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation | |
| 502 void set_cached_class_file(unsigned char *class_file_bytes, | |
| 503 jint class_file_len) { _cached_class_file_len = class_file_len; | |
| 504 _cached_class_file_bytes = class_file_bytes; } | |
| 505 jint get_cached_class_file_len() { return _cached_class_file_len; } | |
| 506 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; } | |
| 507 | |
| 508 // JVMTI: Support for caching of field indices, types, and offsets | |
| 509 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) { | |
| 510 _jvmti_cached_class_field_map = descriptor; | |
| 511 } | |
| 512 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const { | |
| 513 return _jvmti_cached_class_field_map; | |
| 514 } | |
| 515 | |
| 516 // for adding methods, constMethodOopDesc::UNSET_IDNUM means no more ids available | |
| 517 inline u2 next_method_idnum(); | |
| 518 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; } | |
| 519 | |
| 520 // generics support | |
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521 Symbol* generic_signature() const { return _generic_signature; } |
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522 void set_generic_signature(Symbol* sig) { _generic_signature = sig; } |
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523 |
| 0 | 524 u2 enclosing_method_class_index() const { return _enclosing_method_class_index; } |
| 525 u2 enclosing_method_method_index() const { return _enclosing_method_method_index; } | |
| 526 void set_enclosing_method_indices(u2 class_index, | |
| 527 u2 method_index) { _enclosing_method_class_index = class_index; | |
| 528 _enclosing_method_method_index = method_index; } | |
| 529 | |
| 530 // jmethodID support | |
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531 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, |
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532 methodHandle method_h); |
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533 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h, |
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534 size_t idnum, jmethodID new_id, jmethodID* new_jmeths, |
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535 jmethodID* to_dealloc_id_p, |
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536 jmethodID** to_dealloc_jmeths_p); |
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537 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum, |
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538 size_t *length_p, jmethodID* id_p); |
| 0 | 539 jmethodID jmethod_id_or_null(methodOop method); |
| 540 | |
| 541 // cached itable index support | |
| 542 void set_cached_itable_index(size_t idnum, int index); | |
| 543 int cached_itable_index(size_t idnum); | |
| 544 | |
| 545 // annotations support | |
| 546 typeArrayOop class_annotations() const { return _class_annotations; } | |
| 547 objArrayOop fields_annotations() const { return _fields_annotations; } | |
| 548 objArrayOop methods_annotations() const { return _methods_annotations; } | |
| 549 objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; } | |
| 550 objArrayOop methods_default_annotations() const { return _methods_default_annotations; } | |
| 551 void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); } | |
| 552 void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); } | |
| 553 void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); } | |
| 554 void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); } | |
| 555 void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); } | |
| 556 typeArrayOop get_method_annotations_of(int idnum) | |
| 557 { return get_method_annotations_from(idnum, _methods_annotations); } | |
| 558 typeArrayOop get_method_parameter_annotations_of(int idnum) | |
| 559 { return get_method_annotations_from(idnum, _methods_parameter_annotations); } | |
| 560 typeArrayOop get_method_default_annotations_of(int idnum) | |
| 561 { return get_method_annotations_from(idnum, _methods_default_annotations); } | |
| 562 void set_method_annotations_of(int idnum, typeArrayOop anno) | |
| 563 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } | |
| 564 void set_method_parameter_annotations_of(int idnum, typeArrayOop anno) | |
| 565 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } | |
| 566 void set_method_default_annotations_of(int idnum, typeArrayOop anno) | |
| 567 { set_methods_annotations_of(idnum, anno, &_methods_annotations); } | |
| 568 | |
| 569 // allocation | |
| 570 DEFINE_ALLOCATE_PERMANENT(instanceKlass); | |
| 571 instanceOop allocate_instance(TRAPS); | |
| 572 instanceOop allocate_permanent_instance(TRAPS); | |
| 573 | |
| 574 // additional member function to return a handle | |
| 575 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); } | |
| 576 | |
| 577 objArrayOop allocate_objArray(int n, int length, TRAPS); | |
| 578 // Helper function | |
| 579 static instanceOop register_finalizer(instanceOop i, TRAPS); | |
| 580 | |
| 581 // Check whether reflection/jni/jvm code is allowed to instantiate this class; | |
| 582 // if not, throw either an Error or an Exception. | |
| 583 virtual void check_valid_for_instantiation(bool throwError, TRAPS); | |
| 584 | |
| 585 // initialization | |
| 586 void call_class_initializer(TRAPS); | |
| 587 void set_initialization_state_and_notify(ClassState state, TRAPS); | |
| 588 | |
| 589 // OopMapCache support | |
| 590 OopMapCache* oop_map_cache() { return _oop_map_cache; } | |
| 591 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; } | |
| 592 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry); | |
| 593 | |
| 594 // JNI identifier support (for static fields - for jni performance) | |
| 595 JNIid* jni_ids() { return _jni_ids; } | |
| 596 void set_jni_ids(JNIid* ids) { _jni_ids = ids; } | |
| 597 JNIid* jni_id_for(int offset); | |
| 598 | |
| 599 // maintenance of deoptimization dependencies | |
| 600 int mark_dependent_nmethods(DepChange& changes); | |
| 601 void add_dependent_nmethod(nmethod* nm); | |
| 602 void remove_dependent_nmethod(nmethod* nm); | |
| 603 | |
| 604 // On-stack replacement support | |
| 605 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; }; | |
| 606 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; }; | |
| 607 void add_osr_nmethod(nmethod* n); | |
| 608 void remove_osr_nmethod(nmethod* n); | |
| 1783 | 609 nmethod* lookup_osr_nmethod(const methodOop m, int bci, int level, bool match_level) const; |
| 0 | 610 |
| 611 // Breakpoint support (see methods on methodOop for details) | |
| 612 BreakpointInfo* breakpoints() const { return _breakpoints; }; | |
| 613 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; }; | |
| 614 | |
| 615 // support for stub routines | |
| 616 static int init_state_offset_in_bytes() { return offset_of(instanceKlass, _init_state); } | |
| 617 static int init_thread_offset_in_bytes() { return offset_of(instanceKlass, _init_thread); } | |
| 618 | |
| 619 // subclass/subinterface checks | |
| 620 bool implements_interface(klassOop k) const; | |
| 621 | |
| 622 // Access to implementors of an interface. We only store the count | |
| 623 // of implementors, and in case, there are only a few | |
| 624 // implementors, we store them in a short list. | |
| 625 // This accessor returns NULL if we walk off the end of the list. | |
| 626 klassOop implementor(int i) const { | |
| 627 return (i < implementors_limit)? _implementors[i]: (klassOop) NULL; | |
| 628 } | |
| 629 int nof_implementors() const { return _nof_implementors; } | |
| 630 void add_implementor(klassOop k); // k is a new class that implements this interface | |
| 631 void init_implementor(); // initialize | |
| 632 | |
| 633 // link this class into the implementors list of every interface it implements | |
| 634 void process_interfaces(Thread *thread); | |
| 635 | |
| 636 // virtual operations from Klass | |
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637 bool is_leaf_class() const { return _subklass == NULL && _nof_implementors == 0; } |
| 0 | 638 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS); |
| 639 bool compute_is_subtype_of(klassOop k); | |
| 640 bool can_be_primary_super_slow() const; | |
| 641 klassOop java_super() const { return super(); } | |
| 642 int oop_size(oop obj) const { return size_helper(); } | |
| 643 int klass_oop_size() const { return object_size(); } | |
| 644 bool oop_is_instance_slow() const { return true; } | |
| 645 | |
| 646 // Iterators | |
| 647 void do_local_static_fields(FieldClosure* cl); | |
| 648 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields | |
| 649 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS); | |
| 650 | |
| 651 void methods_do(void f(methodOop method)); | |
| 652 void array_klasses_do(void f(klassOop k)); | |
| 653 void with_array_klasses_do(void f(klassOop k)); | |
| 654 bool super_types_do(SuperTypeClosure* blk); | |
| 655 | |
| 656 // Casting from klassOop | |
| 657 static instanceKlass* cast(klassOop k) { | |
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658 assert(k->is_klass(), "must be"); |
| 0 | 659 Klass* kp = k->klass_part(); |
| 660 assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass"); | |
| 661 return (instanceKlass*) kp; | |
| 662 } | |
| 663 | |
| 664 // Sizing (in words) | |
| 665 static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); } | |
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666 int object_size() const { return object_size(align_object_offset(vtable_length()) + align_object_offset(itable_length()) + nonstatic_oop_map_size()); } |
| 0 | 667 static int vtable_start_offset() { return header_size(); } |
| 668 static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; } | |
| 669 static int object_size(int extra) { return align_object_size(header_size() + extra); } | |
| 670 | |
| 671 intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + vtable_start_offset(); } | |
| 672 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); } | |
| 673 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)as_klassOop(); } | |
| 674 | |
| 675 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); } | |
| 676 | |
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677 address static_field_addr(int offset); |
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678 |
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679 OopMapBlock* start_of_nonstatic_oop_maps() const { |
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680 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length())); |
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681 } |
| 0 | 682 |
| 683 // Allocation profiling support | |
| 684 juint alloc_size() const { return _alloc_count * size_helper(); } | |
| 685 void set_alloc_size(juint n) {} | |
| 686 | |
| 687 // Use this to return the size of an instance in heap words: | |
| 688 int size_helper() const { | |
| 689 return layout_helper_to_size_helper(layout_helper()); | |
| 690 } | |
| 691 | |
| 692 // This bit is initialized in classFileParser.cpp. | |
| 693 // It is false under any of the following conditions: | |
| 694 // - the class is abstract (including any interface) | |
| 695 // - the class has a finalizer (if !RegisterFinalizersAtInit) | |
| 696 // - the class size is larger than FastAllocateSizeLimit | |
| 697 // - the class is java/lang/Class, which cannot be allocated directly | |
| 698 bool can_be_fastpath_allocated() const { | |
| 699 return !layout_helper_needs_slow_path(layout_helper()); | |
| 700 } | |
| 701 | |
| 702 // Java vtable/itable | |
| 703 klassVtable* vtable() const; // return new klassVtable wrapper | |
| 704 inline methodOop method_at_vtable(int index); | |
| 705 klassItable* itable() const; // return new klassItable wrapper | |
| 706 methodOop method_at_itable(klassOop holder, int index, TRAPS); | |
| 707 | |
| 708 // Garbage collection | |
| 709 void oop_follow_contents(oop obj); | |
| 710 int oop_adjust_pointers(oop obj); | |
| 711 bool object_is_parsable() const { return _init_state != unparsable_by_gc; } | |
| 712 // Value of _init_state must be zero (unparsable_by_gc) when klass field is set. | |
| 713 | |
| 714 void follow_weak_klass_links( | |
| 715 BoolObjectClosure* is_alive, OopClosure* keep_alive); | |
| 716 void release_C_heap_structures(); | |
| 717 | |
| 718 // Parallel Scavenge and Parallel Old | |
| 719 PARALLEL_GC_DECLS | |
| 720 | |
| 721 // Naming | |
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722 const char* signature_name() const; |
| 0 | 723 |
| 724 // Iterators | |
| 725 int oop_oop_iterate(oop obj, OopClosure* blk) { | |
| 726 return oop_oop_iterate_v(obj, blk); | |
| 727 } | |
| 728 | |
| 729 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) { | |
| 730 return oop_oop_iterate_v_m(obj, blk, mr); | |
| 731 } | |
| 732 | |
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733 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \ |
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734 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \ |
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735 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \ |
| 0 | 736 MemRegion mr); |
| 737 | |
| 738 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL) | |
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739 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL) |
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740 |
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741 #ifndef SERIALGC |
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742 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \ |
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743 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk); |
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744 |
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745 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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746 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL) |
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747 #endif // !SERIALGC |
| 0 | 748 |
| 749 private: | |
| 750 // initialization state | |
| 751 #ifdef ASSERT | |
| 752 void set_init_state(ClassState state); | |
| 753 #else | |
| 754 void set_init_state(ClassState state) { _init_state = state; } | |
| 755 #endif | |
| 975 | 756 void set_rewritten() { _rewritten = true; } |
| 0 | 757 void set_init_thread(Thread *thread) { _init_thread = thread; } |
| 758 | |
| 759 u2 idnum_allocated_count() const { return _idnum_allocated_count; } | |
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760 // The RedefineClasses() API can cause new method idnums to be needed |
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761 // which will cause the caches to grow. Safety requires different |
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762 // cache management logic if the caches can grow instead of just |
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763 // going from NULL to non-NULL. |
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764 bool idnum_can_increment() const { return has_been_redefined(); } |
| 0 | 765 jmethodID* methods_jmethod_ids_acquire() const |
| 766 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); } | |
| 767 void release_set_methods_jmethod_ids(jmethodID* jmeths) | |
| 768 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); } | |
| 769 | |
| 770 int* methods_cached_itable_indices_acquire() const | |
| 771 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); } | |
| 772 void release_set_methods_cached_itable_indices(int* indices) | |
| 773 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); } | |
| 774 | |
| 775 inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos); | |
| 776 void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); } | |
| 777 void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p); | |
| 778 | |
| 779 // Offsets for memory management | |
| 780 oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;} | |
| 781 oop* adr_methods() const { return (oop*)&this->_methods;} | |
| 782 oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;} | |
| 783 oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;} | |
| 784 oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;} | |
| 785 oop* adr_fields() const { return (oop*)&this->_fields;} | |
| 786 oop* adr_constants() const { return (oop*)&this->_constants;} | |
| 787 oop* adr_class_loader() const { return (oop*)&this->_class_loader;} | |
| 788 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;} | |
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789 oop* adr_host_klass() const { return (oop*)&this->_host_klass;} |
| 0 | 790 oop* adr_signers() const { return (oop*)&this->_signers;} |
| 791 oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;} | |
| 792 oop* adr_implementors() const { return (oop*)&this->_implementors[0];} | |
| 793 oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;} | |
| 794 oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;} | |
| 795 oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;} | |
| 796 oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;} | |
| 797 oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;} | |
| 798 oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;} | |
| 799 oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;} | |
| 800 | |
| 801 // Static methods that are used to implement member methods where an exposed this pointer | |
| 802 // is needed due to possible GCs | |
| 803 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); | |
| 804 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS); | |
| 805 static void initialize_impl (instanceKlassHandle this_oop, TRAPS); | |
| 806 static void eager_initialize_impl (instanceKlassHandle this_oop); | |
| 807 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS); | |
| 808 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS); | |
| 809 static klassOop array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS); | |
| 810 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS); | |
| 811 /* jni_id_for_impl for jfieldID only */ | |
| 812 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset); | |
| 813 | |
| 814 // Returns the array class for the n'th dimension | |
| 815 klassOop array_klass_impl(bool or_null, int n, TRAPS); | |
| 816 | |
| 817 // Returns the array class with this class as element type | |
| 818 klassOop array_klass_impl(bool or_null, TRAPS); | |
| 819 | |
| 820 public: | |
| 821 // sharing support | |
| 822 virtual void remove_unshareable_info(); | |
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823 virtual void shared_symbols_iterate(SymbolClosure* closure); |
| 0 | 824 |
| 825 // jvm support | |
| 826 jint compute_modifier_flags(TRAPS) const; | |
| 827 | |
| 828 public: | |
| 829 // JVMTI support | |
| 830 jint jvmti_class_status() const; | |
| 831 | |
| 832 public: | |
| 833 // Printing | |
|
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834 void oop_print_value_on(oop obj, outputStream* st); |
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835 #ifndef PRODUCT |
| 0 | 836 void oop_print_on (oop obj, outputStream* st); |
| 837 | |
| 838 void print_dependent_nmethods(bool verbose = false); | |
| 839 bool is_dependent_nmethod(nmethod* nm); | |
| 840 #endif | |
| 841 | |
| 842 // Verification | |
| 843 const char* internal_name() const; | |
| 844 void oop_verify_on(oop obj, outputStream* st); | |
| 845 | |
| 846 #ifndef PRODUCT | |
| 847 static void verify_class_klass_nonstatic_oop_maps(klassOop k) PRODUCT_RETURN; | |
| 848 #endif | |
| 849 }; | |
| 850 | |
| 851 inline methodOop instanceKlass::method_at_vtable(int index) { | |
| 852 #ifndef PRODUCT | |
| 853 assert(index >= 0, "valid vtable index"); | |
| 854 if (DebugVtables) { | |
| 855 verify_vtable_index(index); | |
| 856 } | |
| 857 #endif | |
| 858 vtableEntry* ve = (vtableEntry*)start_of_vtable(); | |
| 859 return ve[index].method(); | |
| 860 } | |
| 861 | |
| 862 inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) { | |
| 863 if (annos == NULL || annos->length() <= idnum) { | |
| 864 return NULL; | |
| 865 } | |
| 866 return typeArrayOop(annos->obj_at(idnum)); | |
| 867 } | |
| 868 | |
| 869 // for adding methods | |
| 870 // UNSET_IDNUM return means no more ids available | |
| 871 inline u2 instanceKlass::next_method_idnum() { | |
| 872 if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) { | |
| 873 return constMethodOopDesc::UNSET_IDNUM; // no more ids available | |
| 874 } else { | |
| 875 return _idnum_allocated_count++; | |
| 876 } | |
| 877 } | |
| 878 | |
| 879 | |
| 880 /* JNIid class for jfieldIDs only */ | |
| 881 class JNIid: public CHeapObj { | |
| 882 friend class VMStructs; | |
| 883 private: | |
| 884 klassOop _holder; | |
| 885 JNIid* _next; | |
| 886 int _offset; | |
| 887 #ifdef ASSERT | |
| 888 bool _is_static_field_id; | |
| 889 #endif | |
| 890 | |
| 891 public: | |
| 892 // Accessors | |
| 893 klassOop holder() const { return _holder; } | |
| 894 int offset() const { return _offset; } | |
| 895 JNIid* next() { return _next; } | |
| 896 // Constructor | |
| 897 JNIid(klassOop holder, int offset, JNIid* next); | |
| 898 // Identifier lookup | |
| 899 JNIid* find(int offset); | |
| 900 | |
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901 bool find_local_field(fieldDescriptor* fd) { |
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902 return instanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd); |
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903 } |
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904 |
| 0 | 905 // Garbage collection support |
| 906 oop* holder_addr() { return (oop*)&_holder; } | |
| 907 void oops_do(OopClosure* f); | |
| 908 static void deallocate(JNIid* id); | |
| 909 // Debugging | |
| 910 #ifdef ASSERT | |
| 911 bool is_static_field_id() const { return _is_static_field_id; } | |
| 912 void set_is_static_field_id() { _is_static_field_id = true; } | |
| 913 #endif | |
| 914 void verify(klassOop holder); | |
| 915 }; | |
| 916 | |
| 917 | |
| 918 // If breakpoints are more numerous than just JVMTI breakpoints, | |
| 919 // consider compressing this data structure. | |
| 920 // It is currently a simple linked list defined in methodOop.hpp. | |
| 921 | |
| 922 class BreakpointInfo; | |
| 923 | |
| 924 | |
| 925 // A collection point for interesting information about the previous | |
| 926 // version(s) of an instanceKlass. This class uses weak references to | |
| 927 // the information so that the information may be collected as needed | |
|
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928 // by the system. If the information is shared, then a regular |
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929 // reference must be used because a weak reference would be seen as |
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930 // collectible. A GrowableArray of PreviousVersionNodes is attached |
| 0 | 931 // to the instanceKlass as needed. See PreviousVersionWalker below. |
| 932 class PreviousVersionNode : public CHeapObj { | |
| 933 private: | |
|
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934 // A shared ConstantPool is never collected so we'll always have |
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935 // a reference to it so we can update items in the cache. We'll |
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936 // have a weak reference to a non-shared ConstantPool until all |
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937 // of the methods (EMCP or obsolete) have been collected; the |
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938 // non-shared ConstantPool becomes collectible at that point. |
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939 jobject _prev_constant_pool; // regular or weak reference |
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940 bool _prev_cp_is_weak; // true if not a shared ConstantPool |
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941 |
| 0 | 942 // If the previous version of the instanceKlass doesn't have any |
| 943 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the | |
| 944 // EMCP methods have been collected, then _prev_EMCP_methods can | |
| 945 // have a length of zero. | |
| 946 GrowableArray<jweak>* _prev_EMCP_methods; | |
| 947 | |
| 948 public: | |
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949 PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak, |
| 0 | 950 GrowableArray<jweak>* prev_EMCP_methods); |
| 951 ~PreviousVersionNode(); | |
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952 jobject prev_constant_pool() const { |
| 0 | 953 return _prev_constant_pool; |
| 954 } | |
| 955 GrowableArray<jweak>* prev_EMCP_methods() const { | |
| 956 return _prev_EMCP_methods; | |
| 957 } | |
| 958 }; | |
| 959 | |
| 960 | |
| 961 // A Handle-ized version of PreviousVersionNode. | |
| 962 class PreviousVersionInfo : public ResourceObj { | |
| 963 private: | |
| 964 constantPoolHandle _prev_constant_pool_handle; | |
| 965 // If the previous version of the instanceKlass doesn't have any | |
| 966 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the | |
| 967 // methods cannot be collected while we hold a handle, | |
| 968 // _prev_EMCP_methods should never have a length of zero. | |
| 969 GrowableArray<methodHandle>* _prev_EMCP_method_handles; | |
| 970 | |
| 971 public: | |
| 972 PreviousVersionInfo(PreviousVersionNode *pv_node); | |
| 973 ~PreviousVersionInfo(); | |
| 974 constantPoolHandle prev_constant_pool_handle() const { | |
| 975 return _prev_constant_pool_handle; | |
| 976 } | |
| 977 GrowableArray<methodHandle>* prev_EMCP_method_handles() const { | |
| 978 return _prev_EMCP_method_handles; | |
| 979 } | |
| 980 }; | |
| 981 | |
| 982 | |
| 983 // Helper object for walking previous versions. This helper cleans up | |
| 984 // the Handles that it allocates when the helper object is destroyed. | |
| 985 // The PreviousVersionInfo object returned by next_previous_version() | |
| 986 // is only valid until a subsequent call to next_previous_version() or | |
| 987 // the helper object is destroyed. | |
| 988 class PreviousVersionWalker : public StackObj { | |
| 989 private: | |
| 990 GrowableArray<PreviousVersionNode *>* _previous_versions; | |
| 991 int _current_index; | |
| 992 // Fields for cleaning up when we are done walking the previous versions: | |
| 993 // A HandleMark for the PreviousVersionInfo handles: | |
| 994 HandleMark _hm; | |
| 995 | |
| 996 // It would be nice to have a ResourceMark field in this helper also, | |
| 997 // but the ResourceMark code says to be careful to delete handles held | |
| 998 // in GrowableArrays _before_ deleting the GrowableArray. Since we | |
| 999 // can't guarantee the order in which the fields are destroyed, we | |
| 1000 // have to let the creator of the PreviousVersionWalker object do | |
| 1001 // the right thing. Also, adding a ResourceMark here causes an | |
| 1002 // include loop. | |
| 1003 | |
| 1004 // A pointer to the current info object so we can handle the deletes. | |
| 1005 PreviousVersionInfo * _current_p; | |
| 1006 | |
| 1007 public: | |
| 1008 PreviousVersionWalker(instanceKlass *ik); | |
| 1009 ~PreviousVersionWalker(); | |
| 1010 | |
| 1011 // Return the interesting information for the next previous version | |
| 1012 // of the klass. Returns NULL if there are no more previous versions. | |
| 1013 PreviousVersionInfo* next_previous_version(); | |
| 1014 }; | |
| 1972 | 1015 |
| 1016 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP |