1 /*
2 * Copyright 1997-2008 Sun Microsystems, Inc. All Rights Reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
20 * CA 95054 USA or visit www.sun.com if you need additional information or
21 * have any questions.
22 *
23 */
24
25 // An instanceKlass is the VM level representation of a Java class.
26 // It contains all information needed for at class at execution runtime.
27
28 // instanceKlass layout:
29 // [header ] klassOop
30 // [klass pointer ] klassOop
31 // [C++ vtbl pointer ] Klass
32 // [subtype cache ] Klass
33 // [instance size ] Klass
34 // [java mirror ] Klass
35 // [super ] Klass
36 // [access_flags ] Klass
37 // [name ] Klass
38 // [first subklass ] Klass
39 // [next sibling ] Klass
40 // [array klasses ]
41 // [methods ]
42 // [local interfaces ]
43 // [transitive interfaces ]
44 // [number of implementors ]
45 // [implementors ] klassOop[2]
46 // [fields ]
47 // [constants ]
48 // [class loader ]
49 // [protection domain ]
50 // [signers ]
51 // [source file name ]
52 // [inner classes ]
53 // [static field size ]
54 // [nonstatic field size ]
55 // [static oop fields size ]
56 // [nonstatic oop maps size ]
57 // [has finalize method ]
58 // [deoptimization mark bit ]
59 // [initialization state ]
60 // [initializing thread ]
61 // [Java vtable length ]
62 // [oop map cache (stack maps) ]
63 // [EMBEDDED Java vtable ] size in words = vtable_len
64 // [EMBEDDED static oop fields ] size in words = static_oop_fields_size
65 // [ static non-oop fields ] size in words = static_field_size - static_oop_fields_size
66 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
67 //
68 // The embedded nonstatic oop-map blocks are short pairs (offset, length) indicating
69 // where oops are located in instances of this klass.
70
71
72 // forward declaration for class -- see below for definition
73 class SuperTypeClosure;
74 class OopMapBlock;
75 class JNIid;
76 class jniIdMapBase;
77 class BreakpointInfo;
78 class fieldDescriptor;
79 class DepChange;
80 class nmethodBucket;
81 class PreviousVersionNode;
82 class JvmtiCachedClassFieldMap;
83
84 // This is used in iterators below.
85 class FieldClosure: public StackObj {
86 public:
87 virtual void do_field(fieldDescriptor* fd) = 0;
88 };
89
90 #ifndef PRODUCT
91 // Print fields.
92 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
93 class FieldPrinter: public FieldClosure {
94 oop _obj;
95 outputStream* _st;
96 public:
97 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
98 void do_field(fieldDescriptor* fd);
99 };
100 #endif // !PRODUCT
101
102 class instanceKlass: public Klass {
103 friend class VMStructs;
104 public:
105 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
106 // of the class loading & initialization procedure, and the use of the states.
107 enum ClassState {
108 unparsable_by_gc = 0, // object is not yet parsable by gc. Value of _init_state at object allocation.
109 allocated, // allocated (but not yet linked)
110 loaded, // loaded and inserted in class hierarchy (but not linked yet)
111 linked, // successfully linked/verified (but not initialized yet)
112 being_initialized, // currently running class initializer
113 fully_initialized, // initialized (successfull final state)
114 initialization_error // error happened during initialization
115 };
116
117 public:
118 oop* oop_block_beg() const { return adr_array_klasses(); }
119 oop* oop_block_end() const { return adr_methods_default_annotations() + 1; }
120
121 enum {
122 implementors_limit = 2 // how many implems can we track?
123 };
124
125 protected:
126 //
127 // The oop block. See comment in klass.hpp before making changes.
128 //
129
130 // Array classes holding elements of this class.
131 klassOop _array_klasses;
132 // Method array.
133 objArrayOop _methods;
134 // Int array containing the original order of method in the class file (for
135 // JVMTI).
136 typeArrayOop _method_ordering;
137 // Interface (klassOops) this class declares locally to implement.
138 objArrayOop _local_interfaces;
139 // Interface (klassOops) this class implements transitively.
140 objArrayOop _transitive_interfaces;
141 // Instance and static variable information, 5-tuples of shorts [access, name
142 // index, sig index, initval index, offset].
143 typeArrayOop _fields;
144 // Constant pool for this class.
145 constantPoolOop _constants;
146 // Class loader used to load this class, NULL if VM loader used.
147 oop _class_loader;
148 // Protection domain.
149 oop _protection_domain;
150 // Host class, which grants its access privileges to this class also.
151 // This is only non-null for an anonymous class (AnonymousClasses enabled).
152 // The host class is either named, or a previously loaded anonymous class.
153 klassOop _host_klass;
154 // Class signers.
155 objArrayOop _signers;
156 // Name of source file containing this klass, NULL if not specified.
157 symbolOop _source_file_name;
158 // the source debug extension for this klass, NULL if not specified.
159 symbolOop _source_debug_extension;
160 // inner_classes attribute.
161 typeArrayOop _inner_classes;
162 // Implementors of this interface (not valid if it overflows)
163 klassOop _implementors[implementors_limit];
164 // Generic signature, or null if none.
165 symbolOop _generic_signature;
166 // Annotations for this class, or null if none.
167 typeArrayOop _class_annotations;
168 // Annotation objects (byte arrays) for fields, or null if no annotations.
169 // Indices correspond to entries (not indices) in fields array.
170 objArrayOop _fields_annotations;
171 // Annotation objects (byte arrays) for methods, or null if no annotations.
172 // Index is the idnum, which is initially the same as the methods array index.
173 objArrayOop _methods_annotations;
174 // Annotation objects (byte arrays) for methods' parameters, or null if no
175 // such annotations.
176 // Index is the idnum, which is initially the same as the methods array index.
177 objArrayOop _methods_parameter_annotations;
178 // Annotation objects (byte arrays) for methods' default values, or null if no
179 // such annotations.
180 // Index is the idnum, which is initially the same as the methods array index.
181 objArrayOop _methods_default_annotations;
182
183 //
184 // End of the oop block.
185 //
186
187 // Number of heapOopSize words used by non-static fields in this klass
188 // (including inherited fields but after header_size()).
189 int _nonstatic_field_size;
190 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
191 int _static_oop_field_size;// number of static oop fields in this klass
192 int _nonstatic_oop_map_size;// number of nonstatic oop-map blocks allocated at end of this klass
193 bool _is_marked_dependent; // used for marking during flushing and deoptimization
194 bool _rewritten; // methods rewritten.
195 bool _has_nonstatic_fields; // for sizing with UseCompressedOops
196 u2 _minor_version; // minor version number of class file
197 u2 _major_version; // major version number of class file
198 ClassState _init_state; // state of class
199 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
200 int _vtable_len; // length of Java vtable (in words)
201 int _itable_len; // length of Java itable (in words)
202 ReferenceType _reference_type; // reference type
203 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
204 JNIid* _jni_ids; // First JNI identifier for static fields in this class
205 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
206 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL
207 nmethodBucket* _dependencies; // list of dependent nmethods
208 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
209 BreakpointInfo* _breakpoints; // bpt lists, managed by methodOop
210 int _nof_implementors; // No of implementors of this interface (zero if not an interface)
211 // Array of interesting part(s) of the previous version(s) of this
212 // instanceKlass. See PreviousVersionWalker below.
213 GrowableArray<PreviousVersionNode *>* _previous_versions;
214 u2 _enclosing_method_class_index; // Constant pool index for class of enclosing method, or 0 if none
215 u2 _enclosing_method_method_index; // Constant pool index for name and type of enclosing method, or 0 if none
216 // JVMTI fields can be moved to their own structure - see 6315920
217 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH
218 jint _cached_class_file_len; // JVMTI: length of above
219 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
220 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
221
222 // embedded Java vtable follows here
223 // embedded Java itables follows here
224 // embedded static fields follows here
225 // embedded nonstatic oop-map blocks follows here
226
227 friend class instanceKlassKlass;
228 friend class SystemDictionary;
229
230 public:
231 bool has_nonstatic_fields() const { return _has_nonstatic_fields; }
232 void set_has_nonstatic_fields(bool b) { _has_nonstatic_fields = b; }
233
234 // field sizes
235 int nonstatic_field_size() const { return _nonstatic_field_size; }
236 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
237
238 int static_field_size() const { return _static_field_size; }
239 void set_static_field_size(int size) { _static_field_size = size; }
240
241 int static_oop_field_size() const { return _static_oop_field_size; }
242 void set_static_oop_field_size(int size) { _static_oop_field_size = size; }
243
244 // Java vtable
245 int vtable_length() const { return _vtable_len; }
246 void set_vtable_length(int len) { _vtable_len = len; }
247
248 // Java itable
249 int itable_length() const { return _itable_len; }
250 void set_itable_length(int len) { _itable_len = len; }
251
252 // array klasses
253 klassOop array_klasses() const { return _array_klasses; }
254 void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); }
255
256 // methods
257 objArrayOop methods() const { return _methods; }
258 void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); }
259 methodOop method_with_idnum(int idnum);
260
261 // method ordering
262 typeArrayOop method_ordering() const { return _method_ordering; }
263 void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); }
264
265 // interfaces
266 objArrayOop local_interfaces() const { return _local_interfaces; }
267 void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); }
268 objArrayOop transitive_interfaces() const { return _transitive_interfaces; }
269 void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); }
270
271 // fields
272 // Field info extracted from the class file and stored
273 // as an array of 7 shorts
274 enum FieldOffset {
275 access_flags_offset = 0,
276 name_index_offset = 1,
277 signature_index_offset = 2,
278 initval_index_offset = 3,
279 low_offset = 4,
280 high_offset = 5,
281 generic_signature_offset = 6,
282 next_offset = 7
283 };
284
285 typeArrayOop fields() const { return _fields; }
286 int offset_from_fields( int index ) const {
287 return build_int_from_shorts( fields()->ushort_at(index + low_offset),
288 fields()->ushort_at(index + high_offset) );
289 }
290
291 void set_fields(typeArrayOop f) { oop_store_without_check((oop*) &_fields, (oop) f); }
292
293 // inner classes
294 typeArrayOop inner_classes() const { return _inner_classes; }
295 void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) f); }
296
297 enum InnerClassAttributeOffset {
298 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
299 inner_class_inner_class_info_offset = 0,
300 inner_class_outer_class_info_offset = 1,
301 inner_class_inner_name_offset = 2,
302 inner_class_access_flags_offset = 3,
303 inner_class_next_offset = 4
304 };
305
306 // package
307 bool is_same_class_package(klassOop class2);
308 bool is_same_class_package(oop classloader2, symbolOop classname2);
309 static bool is_same_class_package(oop class_loader1, symbolOop class_name1, oop class_loader2, symbolOop class_name2);
310
311 // initialization state
312 bool is_loaded() const { return _init_state >= loaded; }
313 bool is_linked() const { return _init_state >= linked; }
314 bool is_initialized() const { return _init_state == fully_initialized; }
315 bool is_not_initialized() const { return _init_state < being_initialized; }
316 bool is_being_initialized() const { return _init_state == being_initialized; }
317 bool is_in_error_state() const { return _init_state == initialization_error; }
318 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
319 int get_init_state() { return _init_state; } // Useful for debugging
320 bool is_rewritten() const { return _rewritten; }
321
322 // marking
323 bool is_marked_dependent() const { return _is_marked_dependent; }
324 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
325
326 // initialization (virtuals from Klass)
327 bool should_be_initialized() const; // means that initialize should be called
328 void initialize(TRAPS);
329 void link_class(TRAPS);
330 bool link_class_or_fail(TRAPS); // returns false on failure
331 void unlink_class();
332 void rewrite_class(TRAPS);
333 methodOop class_initializer();
334
335 // set the class to initialized if no static initializer is present
336 void eager_initialize(Thread *thread);
337
338 // reference type
339 ReferenceType reference_type() const { return _reference_type; }
340 void set_reference_type(ReferenceType t) { _reference_type = t; }
341
342 // find local field, returns true if found
343 bool find_local_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
344 // find field in direct superinterfaces, returns the interface in which the field is defined
345 klassOop find_interface_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
346 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
347 klassOop find_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
348 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
349 klassOop find_field(symbolOop name, symbolOop sig, bool is_static, fieldDescriptor* fd) const;
350
351 // find a non-static or static field given its offset within the class.
352 bool contains_field_offset(int offset) {
353 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
354 }
355
356 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
357 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
358
359 // find a local method (returns NULL if not found)
360 methodOop find_method(symbolOop name, symbolOop signature) const;
361 static methodOop find_method(objArrayOop methods, symbolOop name, symbolOop signature);
362
363 // lookup operation (returns NULL if not found)
364 methodOop uncached_lookup_method(symbolOop name, symbolOop signature) const;
365
366 // lookup a method in all the interfaces that this class implements
367 // (returns NULL if not found)
368 methodOop lookup_method_in_all_interfaces(symbolOop name, symbolOop signature) const;
369
370 // constant pool
371 constantPoolOop constants() const { return _constants; }
372 void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); }
373
374 // class loader
375 oop class_loader() const { return _class_loader; }
376 void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); }
377
378 // protection domain
379 oop protection_domain() { return _protection_domain; }
380 void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); }
381
382 // host class
383 oop host_klass() const { return _host_klass; }
384 void set_host_klass(oop host) { oop_store((oop*) &_host_klass, host); }
385 bool is_anonymous() const { return _host_klass != NULL; }
386
387 // signers
388 objArrayOop signers() const { return _signers; }
389 void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); }
390
391 // source file name
392 symbolOop source_file_name() const { return _source_file_name; }
393 void set_source_file_name(symbolOop n) { oop_store_without_check((oop*) &_source_file_name, (oop) n); }
394
395 // minor and major version numbers of class file
396 u2 minor_version() const { return _minor_version; }
397 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
398 u2 major_version() const { return _major_version; }
399 void set_major_version(u2 major_version) { _major_version = major_version; }
400
401 // source debug extension
402 symbolOop source_debug_extension() const { return _source_debug_extension; }
403 void set_source_debug_extension(symbolOop n){ oop_store_without_check((oop*) &_source_debug_extension, (oop) n); }
404
405 // nonstatic oop-map blocks
406 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
407 void set_nonstatic_oop_map_size(int size) { _nonstatic_oop_map_size = size; }
408
409 // RedefineClasses() support for previous versions:
410 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods,
411 int emcp_method_count);
412 bool has_previous_version() const;
413 void init_previous_versions() {
414 _previous_versions = NULL;
415 }
416 GrowableArray<PreviousVersionNode *>* previous_versions() const {
417 return _previous_versions;
418 }
419
420 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
421 void set_cached_class_file(unsigned char *class_file_bytes,
422 jint class_file_len) { _cached_class_file_len = class_file_len;
423 _cached_class_file_bytes = class_file_bytes; }
424 jint get_cached_class_file_len() { return _cached_class_file_len; }
425 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; }
426
427 // JVMTI: Support for caching of field indices, types, and offsets
428 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
429 _jvmti_cached_class_field_map = descriptor;
430 }
431 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
432 return _jvmti_cached_class_field_map;
433 }
434
435 // for adding methods, constMethodOopDesc::UNSET_IDNUM means no more ids available
436 inline u2 next_method_idnum();
437 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
438
439 // generics support
440 symbolOop generic_signature() const { return _generic_signature; }
441 void set_generic_signature(symbolOop sig) { oop_store_without_check((oop*)&_generic_signature, (oop)sig); }
442 u2 enclosing_method_class_index() const { return _enclosing_method_class_index; }
443 u2 enclosing_method_method_index() const { return _enclosing_method_method_index; }
444 void set_enclosing_method_indices(u2 class_index,
445 u2 method_index) { _enclosing_method_class_index = class_index;
446 _enclosing_method_method_index = method_index; }
447
448 // jmethodID support
449 static jmethodID get_jmethod_id(instanceKlassHandle ik_h, size_t idnum,
450 jmethodID new_id, jmethodID* new_jmeths);
451 static jmethodID jmethod_id_for_impl(instanceKlassHandle ik_h, methodHandle method_h);
452 jmethodID jmethod_id_or_null(methodOop method);
453
454 // cached itable index support
455 void set_cached_itable_index(size_t idnum, int index);
456 int cached_itable_index(size_t idnum);
457
458 // annotations support
459 typeArrayOop class_annotations() const { return _class_annotations; }
460 objArrayOop fields_annotations() const { return _fields_annotations; }
461 objArrayOop methods_annotations() const { return _methods_annotations; }
462 objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; }
463 objArrayOop methods_default_annotations() const { return _methods_default_annotations; }
464 void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); }
465 void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); }
466 void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); }
467 void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); }
468 void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); }
469 typeArrayOop get_method_annotations_of(int idnum)
470 { return get_method_annotations_from(idnum, _methods_annotations); }
471 typeArrayOop get_method_parameter_annotations_of(int idnum)
472 { return get_method_annotations_from(idnum, _methods_parameter_annotations); }
473 typeArrayOop get_method_default_annotations_of(int idnum)
474 { return get_method_annotations_from(idnum, _methods_default_annotations); }
475 void set_method_annotations_of(int idnum, typeArrayOop anno)
476 { set_methods_annotations_of(idnum, anno, &_methods_annotations); }
477 void set_method_parameter_annotations_of(int idnum, typeArrayOop anno)
478 { set_methods_annotations_of(idnum, anno, &_methods_annotations); }
479 void set_method_default_annotations_of(int idnum, typeArrayOop anno)
480 { set_methods_annotations_of(idnum, anno, &_methods_annotations); }
481
482 // allocation
483 DEFINE_ALLOCATE_PERMANENT(instanceKlass);
484 instanceOop allocate_instance(TRAPS);
485 instanceOop allocate_permanent_instance(TRAPS);
486
487 // additional member function to return a handle
488 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
489
490 objArrayOop allocate_objArray(int n, int length, TRAPS);
491 // Helper function
492 static instanceOop register_finalizer(instanceOop i, TRAPS);
493
494 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
495 // if not, throw either an Error or an Exception.
496 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
497
498 // initialization
499 void call_class_initializer(TRAPS);
500 void set_initialization_state_and_notify(ClassState state, TRAPS);
501
502 // OopMapCache support
503 OopMapCache* oop_map_cache() { return _oop_map_cache; }
504 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
505 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
506
507 // JNI identifier support (for static fields - for jni performance)
508 JNIid* jni_ids() { return _jni_ids; }
509 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
510 JNIid* jni_id_for(int offset);
511
512 // maintenance of deoptimization dependencies
513 int mark_dependent_nmethods(DepChange& changes);
514 void add_dependent_nmethod(nmethod* nm);
515 void remove_dependent_nmethod(nmethod* nm);
516
517 // On-stack replacement support
518 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
519 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
520 void add_osr_nmethod(nmethod* n);
521 void remove_osr_nmethod(nmethod* n);
522 nmethod* lookup_osr_nmethod(const methodOop m, int bci) const;
523
524 // Breakpoint support (see methods on methodOop for details)
525 BreakpointInfo* breakpoints() const { return _breakpoints; };
526 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
527
528 // support for stub routines
529 static int init_state_offset_in_bytes() { return offset_of(instanceKlass, _init_state); }
530 static int init_thread_offset_in_bytes() { return offset_of(instanceKlass, _init_thread); }
531
532 // subclass/subinterface checks
533 bool implements_interface(klassOop k) const;
534
535 // Access to implementors of an interface. We only store the count
536 // of implementors, and in case, there are only a few
537 // implementors, we store them in a short list.
538 // This accessor returns NULL if we walk off the end of the list.
539 klassOop implementor(int i) const {
540 return (i < implementors_limit)? _implementors[i]: (klassOop) NULL;
541 }
542 int nof_implementors() const { return _nof_implementors; }
543 void add_implementor(klassOop k); // k is a new class that implements this interface
544 void init_implementor(); // initialize
545
546 // link this class into the implementors list of every interface it implements
547 void process_interfaces(Thread *thread);
548
549 // virtual operations from Klass
550 bool is_leaf_class() const { return _subklass == NULL; }
551 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS);
552 bool compute_is_subtype_of(klassOop k);
553 bool can_be_primary_super_slow() const;
554 klassOop java_super() const { return super(); }
555 int oop_size(oop obj) const { return size_helper(); }
556 int klass_oop_size() const { return object_size(); }
557 bool oop_is_instance_slow() const { return true; }
558
559 // Iterators
560 void do_local_static_fields(FieldClosure* cl);
561 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
562 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS);
563
564 void methods_do(void f(methodOop method));
565 void array_klasses_do(void f(klassOop k));
566 void with_array_klasses_do(void f(klassOop k));
567 bool super_types_do(SuperTypeClosure* blk);
568
569 // Casting from klassOop
570 static instanceKlass* cast(klassOop k) {
571 Klass* kp = k->klass_part();
572 assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass");
573 return (instanceKlass*) kp;
574 }
575
576 // Sizing (in words)
577 static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); }
578 int object_size() const { return object_size(align_object_offset(vtable_length()) + align_object_offset(itable_length()) + static_field_size() + nonstatic_oop_map_size()); }
579 static int vtable_start_offset() { return header_size(); }
580 static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; }
581 static int object_size(int extra) { return align_object_size(header_size() + extra); }
582
583 intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + vtable_start_offset(); }
584 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
585 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)as_klassOop(); }
586
587 // Static field offset is an offset into the Heap, should be converted by
588 // based on UseCompressedOop for traversal
589 HeapWord* start_of_static_fields() const {
590 return (HeapWord*)(start_of_itable() + align_object_offset(itable_length()));
591 }
592
593 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
594
595 int offset_of_static_fields() const {
596 return (intptr_t)start_of_static_fields() - (intptr_t)as_klassOop();
597 }
598
599 OopMapBlock* start_of_nonstatic_oop_maps() const {
600 return (OopMapBlock*) (start_of_static_fields() + static_field_size());
601 }
602
603 // Allocation profiling support
604 juint alloc_size() const { return _alloc_count * size_helper(); }
605 void set_alloc_size(juint n) {}
606
607 // Use this to return the size of an instance in heap words:
608 int size_helper() const {
609 return layout_helper_to_size_helper(layout_helper());
610 }
611
612 // This bit is initialized in classFileParser.cpp.
613 // It is false under any of the following conditions:
614 // - the class is abstract (including any interface)
615 // - the class has a finalizer (if !RegisterFinalizersAtInit)
616 // - the class size is larger than FastAllocateSizeLimit
617 // - the class is java/lang/Class, which cannot be allocated directly
618 bool can_be_fastpath_allocated() const {
619 return !layout_helper_needs_slow_path(layout_helper());
620 }
621
622 // Java vtable/itable
623 klassVtable* vtable() const; // return new klassVtable wrapper
624 inline methodOop method_at_vtable(int index);
625 klassItable* itable() const; // return new klassItable wrapper
626 methodOop method_at_itable(klassOop holder, int index, TRAPS);
627
628 // Garbage collection
629 void oop_follow_contents(oop obj);
630 void follow_static_fields();
631 void adjust_static_fields();
632 int oop_adjust_pointers(oop obj);
633 bool object_is_parsable() const { return _init_state != unparsable_by_gc; }
634 // Value of _init_state must be zero (unparsable_by_gc) when klass field is set.
635
636 void follow_weak_klass_links(
637 BoolObjectClosure* is_alive, OopClosure* keep_alive);
638 void release_C_heap_structures();
639
640 // Parallel Scavenge and Parallel Old
641 PARALLEL_GC_DECLS
642
643 #ifndef SERIALGC
644 // Parallel Scavenge
645 void copy_static_fields(PSPromotionManager* pm);
646 void push_static_fields(PSPromotionManager* pm);
647
648 // Parallel Old
649 void follow_static_fields(ParCompactionManager* cm);
650 void copy_static_fields(ParCompactionManager* cm);
651 void update_static_fields();
652 void update_static_fields(HeapWord* beg_addr, HeapWord* end_addr);
653 #endif // SERIALGC
654
655 // Naming
656 char* signature_name() const;
657
658 // Iterators
659 int oop_oop_iterate(oop obj, OopClosure* blk) {
660 return oop_oop_iterate_v(obj, blk);
661 }
662
663 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
664 return oop_oop_iterate_v_m(obj, blk, mr);
665 }
666
667 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
668 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
669 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
670 MemRegion mr);
671
672 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
673 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
674
675 #ifndef SERIALGC
676 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
677 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
678
679 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
680 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
681 #endif // !SERIALGC
682
683 void iterate_static_fields(OopClosure* closure);
684 void iterate_static_fields(OopClosure* closure, MemRegion mr);
685
686 private:
687 // initialization state
688 #ifdef ASSERT
689 void set_init_state(ClassState state);
690 #else
691 void set_init_state(ClassState state) { _init_state = state; }
692 #endif
693 void set_rewritten() { _rewritten = true; }
694 void set_init_thread(Thread *thread) { _init_thread = thread; }
695
696 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
697 jmethodID* methods_jmethod_ids_acquire() const
698 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
699 void release_set_methods_jmethod_ids(jmethodID* jmeths)
700 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
701
702 int* methods_cached_itable_indices_acquire() const
703 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); }
704 void release_set_methods_cached_itable_indices(int* indices)
705 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); }
706
707 inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos);
708 void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); }
709 void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p);
710
711 // Offsets for memory management
712 oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;}
713 oop* adr_methods() const { return (oop*)&this->_methods;}
714 oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;}
715 oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;}
716 oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;}
717 oop* adr_fields() const { return (oop*)&this->_fields;}
718 oop* adr_constants() const { return (oop*)&this->_constants;}
719 oop* adr_class_loader() const { return (oop*)&this->_class_loader;}
720 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;}
721 oop* adr_host_klass() const { return (oop*)&this->_host_klass;}
722 oop* adr_signers() const { return (oop*)&this->_signers;}
723 oop* adr_source_file_name() const { return (oop*)&this->_source_file_name;}
724 oop* adr_source_debug_extension() const { return (oop*)&this->_source_debug_extension;}
725 oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;}
726 oop* adr_implementors() const { return (oop*)&this->_implementors[0];}
727 oop* adr_generic_signature() const { return (oop*)&this->_generic_signature;}
728 oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;}
729 oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;}
730 oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;}
731 oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;}
732 oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;}
733 oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;}
734 oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;}
735
736 // Static methods that are used to implement member methods where an exposed this pointer
737 // is needed due to possible GCs
738 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
739 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
740 static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
741 static void eager_initialize_impl (instanceKlassHandle this_oop);
742 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
743 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
744 static klassOop array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
745 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS);
746 /* jni_id_for_impl for jfieldID only */
747 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
748
749 // Returns the array class for the n'th dimension
750 klassOop array_klass_impl(bool or_null, int n, TRAPS);
751
752 // Returns the array class with this class as element type
753 klassOop array_klass_impl(bool or_null, TRAPS);
754
755 public:
756 // sharing support
757 virtual void remove_unshareable_info();
758 void field_names_and_sigs_iterate(OopClosure* closure);
759
760 // jvm support
761 jint compute_modifier_flags(TRAPS) const;
762
763 public:
764 // JVMTI support
765 jint jvmti_class_status() const;
766
767 #ifndef PRODUCT
768 public:
769 // Printing
770 void oop_print_on (oop obj, outputStream* st);
771 void oop_print_value_on(oop obj, outputStream* st);
772
773 void print_dependent_nmethods(bool verbose = false);
774 bool is_dependent_nmethod(nmethod* nm);
775 #endif
776
777 public:
778 // Verification
779 const char* internal_name() const;
780 void oop_verify_on(oop obj, outputStream* st);
781
782 #ifndef PRODUCT
783 static void verify_class_klass_nonstatic_oop_maps(klassOop k) PRODUCT_RETURN;
784 #endif
785 };
786
787 inline methodOop instanceKlass::method_at_vtable(int index) {
788 #ifndef PRODUCT
789 assert(index >= 0, "valid vtable index");
790 if (DebugVtables) {
791 verify_vtable_index(index);
792 }
793 #endif
794 vtableEntry* ve = (vtableEntry*)start_of_vtable();
795 return ve[index].method();
796 }
797
798 inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) {
799 if (annos == NULL || annos->length() <= idnum) {
800 return NULL;
801 }
802 return typeArrayOop(annos->obj_at(idnum));
803 }
804
805 // for adding methods
806 // UNSET_IDNUM return means no more ids available
807 inline u2 instanceKlass::next_method_idnum() {
808 if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) {
809 return constMethodOopDesc::UNSET_IDNUM; // no more ids available
810 } else {
811 return _idnum_allocated_count++;
812 }
813 }
814
815
816 // ValueObjs embedded in klass. Describes where oops are located in instances of this klass.
817
818 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
819 private:
820 jushort _offset; // Offset of first oop in oop-map block
821 jushort _length; // Length of oop-map block
822 public:
823 // Accessors
824 jushort offset() const { return _offset; }
825 void set_offset(jushort offset) { _offset = offset; }
826
827 jushort length() const { return _length; }
828 void set_length(jushort length) { _length = length; }
829 };
830
831 /* JNIid class for jfieldIDs only */
832 class JNIid: public CHeapObj {
833 friend class VMStructs;
834 private:
835 klassOop _holder;
836 JNIid* _next;
837 int _offset;
838 #ifdef ASSERT
839 bool _is_static_field_id;
840 #endif
841
842 public:
843 // Accessors
844 klassOop holder() const { return _holder; }
845 int offset() const { return _offset; }
846 JNIid* next() { return _next; }
847 // Constructor
848 JNIid(klassOop holder, int offset, JNIid* next);
849 // Identifier lookup
850 JNIid* find(int offset);
851
852 // Garbage collection support
853 oop* holder_addr() { return (oop*)&_holder; }
854 void oops_do(OopClosure* f);
855 static void deallocate(JNIid* id);
856 // Debugging
857 #ifdef ASSERT
858 bool is_static_field_id() const { return _is_static_field_id; }
859 void set_is_static_field_id() { _is_static_field_id = true; }
860 #endif
861 void verify(klassOop holder);
862 };
863
864
865 // If breakpoints are more numerous than just JVMTI breakpoints,
866 // consider compressing this data structure.
867 // It is currently a simple linked list defined in methodOop.hpp.
868
869 class BreakpointInfo;
870
871
872 // A collection point for interesting information about the previous
873 // version(s) of an instanceKlass. This class uses weak references to
874 // the information so that the information may be collected as needed
875 // by the system. If the information is shared, then a regular
876 // reference must be used because a weak reference would be seen as
877 // collectible. A GrowableArray of PreviousVersionNodes is attached
878 // to the instanceKlass as needed. See PreviousVersionWalker below.
879 class PreviousVersionNode : public CHeapObj {
880 private:
881 // A shared ConstantPool is never collected so we'll always have
882 // a reference to it so we can update items in the cache. We'll
883 // have a weak reference to a non-shared ConstantPool until all
884 // of the methods (EMCP or obsolete) have been collected; the
885 // non-shared ConstantPool becomes collectible at that point.
886 jobject _prev_constant_pool; // regular or weak reference
887 bool _prev_cp_is_weak; // true if not a shared ConstantPool
888
889 // If the previous version of the instanceKlass doesn't have any
890 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the
891 // EMCP methods have been collected, then _prev_EMCP_methods can
892 // have a length of zero.
893 GrowableArray<jweak>* _prev_EMCP_methods;
894
895 public:
896 PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak,
897 GrowableArray<jweak>* prev_EMCP_methods);
898 ~PreviousVersionNode();
899 jobject prev_constant_pool() const {
900 return _prev_constant_pool;
901 }
902 GrowableArray<jweak>* prev_EMCP_methods() const {
903 return _prev_EMCP_methods;
904 }
905 };
906
907
908 // A Handle-ized version of PreviousVersionNode.
909 class PreviousVersionInfo : public ResourceObj {
910 private:
911 constantPoolHandle _prev_constant_pool_handle;
912 // If the previous version of the instanceKlass doesn't have any
913 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the
914 // methods cannot be collected while we hold a handle,
915 // _prev_EMCP_methods should never have a length of zero.
916 GrowableArray<methodHandle>* _prev_EMCP_method_handles;
917
918 public:
919 PreviousVersionInfo(PreviousVersionNode *pv_node);
920 ~PreviousVersionInfo();
921 constantPoolHandle prev_constant_pool_handle() const {
922 return _prev_constant_pool_handle;
923 }
924 GrowableArray<methodHandle>* prev_EMCP_method_handles() const {
925 return _prev_EMCP_method_handles;
926 }
927 };
928
929
930 // Helper object for walking previous versions. This helper cleans up
931 // the Handles that it allocates when the helper object is destroyed.
932 // The PreviousVersionInfo object returned by next_previous_version()
933 // is only valid until a subsequent call to next_previous_version() or
934 // the helper object is destroyed.
935 class PreviousVersionWalker : public StackObj {
936 private:
937 GrowableArray<PreviousVersionNode *>* _previous_versions;
938 int _current_index;
939 // Fields for cleaning up when we are done walking the previous versions:
940 // A HandleMark for the PreviousVersionInfo handles:
941 HandleMark _hm;
942
943 // It would be nice to have a ResourceMark field in this helper also,
944 // but the ResourceMark code says to be careful to delete handles held
945 // in GrowableArrays _before_ deleting the GrowableArray. Since we
946 // can't guarantee the order in which the fields are destroyed, we
947 // have to let the creator of the PreviousVersionWalker object do
948 // the right thing. Also, adding a ResourceMark here causes an
949 // include loop.
950
951 // A pointer to the current info object so we can handle the deletes.
952 PreviousVersionInfo * _current_p;
953
954 public:
955 PreviousVersionWalker(instanceKlass *ik);
956 ~PreviousVersionWalker();
957
958 // Return the interesting information for the next previous version
959 // of the klass. Returns NULL if there are no more previous versions.
960 PreviousVersionInfo* next_previous_version();
961 };