1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 // An instanceKlass is the VM level representation of a Java class.
26 // It contains all information needed for at class at execution runtime.
27
28 // instanceKlass layout:
29 // [header ] klassOop
30 // [klass pointer ] klassOop
31 // [C++ vtbl pointer ] Klass
32 // [subtype cache ] Klass
33 // [instance size ] Klass
34 // [java mirror ] Klass
35 // [super ] Klass
36 // [access_flags ] Klass
37 // [name ] Klass
38 // [first subklass ] Klass
39 // [next sibling ] Klass
40 // [array klasses ]
41 // [methods ]
42 // [local interfaces ]
43 // [transitive interfaces ]
44 // [number of implementors ]
45 // [implementors ] klassOop[2]
46 // [fields ]
47 // [constants ]
48 // [class loader ]
49 // [protection domain ]
50 // [signers ]
51 // [source file name ]
52 // [inner classes ]
53 // [static field size ]
54 // [nonstatic field size ]
55 // [static oop fields size ]
56 // [nonstatic oop maps size ]
57 // [has finalize method ]
58 // [deoptimization mark bit ]
59 // [initialization state ]
60 // [initializing thread ]
61 // [Java vtable length ]
62 // [oop map cache (stack maps) ]
63 // [EMBEDDED Java vtable ] size in words = vtable_len
64 // [EMBEDDED static oop fields ] size in words = static_oop_fields_size
65 // [ static non-oop fields ] size in words = static_field_size - static_oop_fields_size
66 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
67 //
68 // The embedded nonstatic oop-map blocks are short pairs (offset, length) indicating
69 // where oops are located in instances of this klass.
70
71
72 // forward declaration for class -- see below for definition
73 class SuperTypeClosure;
74 class JNIid;
75 class jniIdMapBase;
76 class BreakpointInfo;
77 class fieldDescriptor;
78 class DepChange;
79 class nmethodBucket;
80 class PreviousVersionNode;
81 class JvmtiCachedClassFieldMap;
82
83 // This is used in iterators below.
84 class FieldClosure: public StackObj {
85 public:
86 virtual void do_field(fieldDescriptor* fd) = 0;
87 };
88
89 #ifndef PRODUCT
90 // Print fields.
91 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
92 class FieldPrinter: public FieldClosure {
93 oop _obj;
94 outputStream* _st;
95 public:
96 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
97 void do_field(fieldDescriptor* fd);
98 };
99 #endif // !PRODUCT
100
101 // ValueObjs embedded in klass. Describes where oops are located in instances of
102 // this klass.
103 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
104 public:
105 // Byte offset of the first oop mapped by this block.
106 int offset() const { return _offset; }
107 void set_offset(int offset) { _offset = offset; }
108
109 // Number of oops in this block.
110 uint count() const { return _count; }
111 void set_count(uint count) { _count = count; }
112
113 // sizeof(OopMapBlock) in HeapWords.
114 static const int size_in_words() {
115 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
116 LogHeapWordSize;
117 }
118
119 private:
120 int _offset;
121 uint _count;
122 };
123
124 class instanceKlass: public Klass {
125 friend class VMStructs;
126 public:
127 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
128 // of the class loading & initialization procedure, and the use of the states.
129 enum ClassState {
130 unparsable_by_gc = 0, // object is not yet parsable by gc. Value of _init_state at object allocation.
131 allocated, // allocated (but not yet linked)
132 loaded, // loaded and inserted in class hierarchy (but not linked yet)
133 linked, // successfully linked/verified (but not initialized yet)
134 being_initialized, // currently running class initializer
135 fully_initialized, // initialized (successfull final state)
136 initialization_error // error happened during initialization
137 };
138
139 public:
140 oop* oop_block_beg() const { return adr_array_klasses(); }
141 oop* oop_block_end() const { return adr_methods_default_annotations() + 1; }
142
143 enum {
144 implementors_limit = 2 // how many implems can we track?
145 };
146
147 protected:
148 //
149 // The oop block. See comment in klass.hpp before making changes.
150 //
151
152 // Array classes holding elements of this class.
153 klassOop _array_klasses;
154 // Method array.
155 objArrayOop _methods;
156 // Int array containing the original order of method in the class file (for
157 // JVMTI).
158 typeArrayOop _method_ordering;
159 // Interface (klassOops) this class declares locally to implement.
160 objArrayOop _local_interfaces;
161 // Interface (klassOops) this class implements transitively.
162 objArrayOop _transitive_interfaces;
163 // Instance and static variable information, 5-tuples of shorts [access, name
164 // index, sig index, initval index, offset].
165 typeArrayOop _fields;
166 // Constant pool for this class.
167 constantPoolOop _constants;
168 // Class loader used to load this class, NULL if VM loader used.
169 oop _class_loader;
170 // Protection domain.
171 oop _protection_domain;
172 // Host class, which grants its access privileges to this class also.
173 // This is only non-null for an anonymous class (AnonymousClasses enabled).
174 // The host class is either named, or a previously loaded anonymous class.
175 klassOop _host_klass;
176 // Class signers.
177 objArrayOop _signers;
178 // Name of source file containing this klass, NULL if not specified.
179 symbolOop _source_file_name;
180 // the source debug extension for this klass, NULL if not specified.
181 symbolOop _source_debug_extension;
182 // inner_classes attribute.
183 typeArrayOop _inner_classes;
184 // Implementors of this interface (not valid if it overflows)
185 klassOop _implementors[implementors_limit];
186 // Generic signature, or null if none.
187 symbolOop _generic_signature;
188 // invokedynamic bootstrap method (a java.dyn.MethodHandle)
189 oop _bootstrap_method;
190 // Annotations for this class, or null if none.
191 typeArrayOop _class_annotations;
192 // Annotation objects (byte arrays) for fields, or null if no annotations.
193 // Indices correspond to entries (not indices) in fields array.
194 objArrayOop _fields_annotations;
195 // Annotation objects (byte arrays) for methods, or null if no annotations.
196 // Index is the idnum, which is initially the same as the methods array index.
197 objArrayOop _methods_annotations;
198 // Annotation objects (byte arrays) for methods' parameters, or null if no
199 // such annotations.
200 // Index is the idnum, which is initially the same as the methods array index.
201 objArrayOop _methods_parameter_annotations;
202 // Annotation objects (byte arrays) for methods' default values, or null if no
203 // such annotations.
204 // Index is the idnum, which is initially the same as the methods array index.
205 objArrayOop _methods_default_annotations;
206
207 //
208 // End of the oop block.
209 //
210
211 // Number of heapOopSize words used by non-static fields in this klass
212 // (including inherited fields but after header_size()).
213 int _nonstatic_field_size;
214 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
215 int _static_oop_field_size;// number of static oop fields in this klass
216 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
217 bool _is_marked_dependent; // used for marking during flushing and deoptimization
218 bool _rewritten; // methods rewritten.
219 bool _has_nonstatic_fields; // for sizing with UseCompressedOops
220 bool _should_verify_class; // allow caching of preverification
221 u2 _minor_version; // minor version number of class file
222 u2 _major_version; // major version number of class file
223 ClassState _init_state; // state of class
224 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
225 int _vtable_len; // length of Java vtable (in words)
226 int _itable_len; // length of Java itable (in words)
227 ReferenceType _reference_type; // reference type
228 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
229 JNIid* _jni_ids; // First JNI identifier for static fields in this class
230 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
231 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL
232 nmethodBucket* _dependencies; // list of dependent nmethods
233 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
234 BreakpointInfo* _breakpoints; // bpt lists, managed by methodOop
235 int _nof_implementors; // No of implementors of this interface (zero if not an interface)
236 // Array of interesting part(s) of the previous version(s) of this
237 // instanceKlass. See PreviousVersionWalker below.
238 GrowableArray<PreviousVersionNode *>* _previous_versions;
239 u2 _enclosing_method_class_index; // Constant pool index for class of enclosing method, or 0 if none
240 u2 _enclosing_method_method_index; // Constant pool index for name and type of enclosing method, or 0 if none
241 // JVMTI fields can be moved to their own structure - see 6315920
242 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH
243 jint _cached_class_file_len; // JVMTI: length of above
244 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
245 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
246
247 // embedded Java vtable follows here
248 // embedded Java itables follows here
249 // embedded static fields follows here
250 // embedded nonstatic oop-map blocks follows here
251
252 friend class instanceKlassKlass;
253 friend class SystemDictionary;
254
255 public:
256 bool has_nonstatic_fields() const { return _has_nonstatic_fields; }
257 void set_has_nonstatic_fields(bool b) { _has_nonstatic_fields = b; }
258
259 // field sizes
260 int nonstatic_field_size() const { return _nonstatic_field_size; }
261 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
262
263 int static_field_size() const { return _static_field_size; }
264 void set_static_field_size(int size) { _static_field_size = size; }
265
266 int static_oop_field_size() const { return _static_oop_field_size; }
267 void set_static_oop_field_size(int size) { _static_oop_field_size = size; }
268
269 // Java vtable
270 int vtable_length() const { return _vtable_len; }
271 void set_vtable_length(int len) { _vtable_len = len; }
272
273 // Java itable
274 int itable_length() const { return _itable_len; }
275 void set_itable_length(int len) { _itable_len = len; }
276
277 // array klasses
278 klassOop array_klasses() const { return _array_klasses; }
279 void set_array_klasses(klassOop k) { oop_store_without_check((oop*) &_array_klasses, (oop) k); }
280
281 // methods
282 objArrayOop methods() const { return _methods; }
283 void set_methods(objArrayOop a) { oop_store_without_check((oop*) &_methods, (oop) a); }
284 methodOop method_with_idnum(int idnum);
285
286 // method ordering
287 typeArrayOop method_ordering() const { return _method_ordering; }
288 void set_method_ordering(typeArrayOop m) { oop_store_without_check((oop*) &_method_ordering, (oop) m); }
289
290 // interfaces
291 objArrayOop local_interfaces() const { return _local_interfaces; }
292 void set_local_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_local_interfaces, (oop) a); }
293 objArrayOop transitive_interfaces() const { return _transitive_interfaces; }
294 void set_transitive_interfaces(objArrayOop a) { oop_store_without_check((oop*) &_transitive_interfaces, (oop) a); }
295
296 // fields
297 // Field info extracted from the class file and stored
298 // as an array of 7 shorts
299 enum FieldOffset {
300 access_flags_offset = 0,
301 name_index_offset = 1,
302 signature_index_offset = 2,
303 initval_index_offset = 3,
304 low_offset = 4,
305 high_offset = 5,
306 generic_signature_offset = 6,
307 next_offset = 7
308 };
309
310 typeArrayOop fields() const { return _fields; }
311 int offset_from_fields( int index ) const {
312 return build_int_from_shorts( fields()->ushort_at(index + low_offset),
313 fields()->ushort_at(index + high_offset) );
314 }
315
316 void set_fields(typeArrayOop f) { oop_store_without_check((oop*) &_fields, (oop) f); }
317
318 // inner classes
319 typeArrayOop inner_classes() const { return _inner_classes; }
320 void set_inner_classes(typeArrayOop f) { oop_store_without_check((oop*) &_inner_classes, (oop) f); }
321
322 enum InnerClassAttributeOffset {
323 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
324 inner_class_inner_class_info_offset = 0,
325 inner_class_outer_class_info_offset = 1,
326 inner_class_inner_name_offset = 2,
327 inner_class_access_flags_offset = 3,
328 inner_class_next_offset = 4
329 };
330
331 // method override check
332 bool is_override(methodHandle super_method, Handle targetclassloader, symbolHandle targetclassname, TRAPS);
333
334 // package
335 bool is_same_class_package(klassOop class2);
336 bool is_same_class_package(oop classloader2, symbolOop classname2);
337 static bool is_same_class_package(oop class_loader1, symbolOop class_name1, oop class_loader2, symbolOop class_name2);
338
339 // find an enclosing class (defined where original code was, in jvm.cpp!)
340 klassOop compute_enclosing_class(bool* inner_is_member, TRAPS) {
341 instanceKlassHandle self(THREAD, this->as_klassOop());
342 return compute_enclosing_class_impl(self, inner_is_member, THREAD);
343 }
344 static klassOop compute_enclosing_class_impl(instanceKlassHandle self,
345 bool* inner_is_member, TRAPS);
346
347 // tell if two classes have the same enclosing class (at package level)
348 bool is_same_package_member(klassOop class2, TRAPS) {
349 instanceKlassHandle self(THREAD, this->as_klassOop());
350 return is_same_package_member_impl(self, class2, THREAD);
351 }
352 static bool is_same_package_member_impl(instanceKlassHandle self,
353 klassOop class2, TRAPS);
354
355 // initialization state
356 bool is_loaded() const { return _init_state >= loaded; }
357 bool is_linked() const { return _init_state >= linked; }
358 bool is_initialized() const { return _init_state == fully_initialized; }
359 bool is_not_initialized() const { return _init_state < being_initialized; }
360 bool is_being_initialized() const { return _init_state == being_initialized; }
361 bool is_in_error_state() const { return _init_state == initialization_error; }
362 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
363 int get_init_state() { return _init_state; } // Useful for debugging
364 bool is_rewritten() const { return _rewritten; }
365
366 // defineClass specified verification
367 bool should_verify_class() const { return _should_verify_class; }
368 void set_should_verify_class(bool value) { _should_verify_class = value; }
369
370 // marking
371 bool is_marked_dependent() const { return _is_marked_dependent; }
372 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
373
374 // initialization (virtuals from Klass)
375 bool should_be_initialized() const; // means that initialize should be called
376 void initialize(TRAPS);
377 void link_class(TRAPS);
378 bool link_class_or_fail(TRAPS); // returns false on failure
379 void unlink_class();
380 void rewrite_class(TRAPS);
381 methodOop class_initializer();
382
383 // set the class to initialized if no static initializer is present
384 void eager_initialize(Thread *thread);
385
386 // reference type
387 ReferenceType reference_type() const { return _reference_type; }
388 void set_reference_type(ReferenceType t) { _reference_type = t; }
389
390 // find local field, returns true if found
391 bool find_local_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
392 // find field in direct superinterfaces, returns the interface in which the field is defined
393 klassOop find_interface_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
394 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
395 klassOop find_field(symbolOop name, symbolOop sig, fieldDescriptor* fd) const;
396 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
397 klassOop find_field(symbolOop name, symbolOop sig, bool is_static, fieldDescriptor* fd) const;
398
399 // find a non-static or static field given its offset within the class.
400 bool contains_field_offset(int offset) {
401 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
402 }
403
404 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
405 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
406
407 // find a local method (returns NULL if not found)
408 methodOop find_method(symbolOop name, symbolOop signature) const;
409 static methodOop find_method(objArrayOop methods, symbolOop name, symbolOop signature);
410
411 // lookup operation (returns NULL if not found)
412 methodOop uncached_lookup_method(symbolOop name, symbolOop signature) const;
413
414 // lookup a method in all the interfaces that this class implements
415 // (returns NULL if not found)
416 methodOop lookup_method_in_all_interfaces(symbolOop name, symbolOop signature) const;
417
418 // constant pool
419 constantPoolOop constants() const { return _constants; }
420 void set_constants(constantPoolOop c) { oop_store_without_check((oop*) &_constants, (oop) c); }
421
422 // class loader
423 oop class_loader() const { return _class_loader; }
424 void set_class_loader(oop l) { oop_store((oop*) &_class_loader, l); }
425
426 // protection domain
427 oop protection_domain() { return _protection_domain; }
428 void set_protection_domain(oop pd) { oop_store((oop*) &_protection_domain, pd); }
429
430 // host class
431 oop host_klass() const { return _host_klass; }
432 void set_host_klass(oop host) { oop_store((oop*) &_host_klass, host); }
433 bool is_anonymous() const { return _host_klass != NULL; }
434
435 // signers
436 objArrayOop signers() const { return _signers; }
437 void set_signers(objArrayOop s) { oop_store((oop*) &_signers, oop(s)); }
438
439 // source file name
440 symbolOop source_file_name() const { return _source_file_name; }
441 void set_source_file_name(symbolOop n) { oop_store_without_check((oop*) &_source_file_name, (oop) n); }
442
443 // minor and major version numbers of class file
444 u2 minor_version() const { return _minor_version; }
445 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
446 u2 major_version() const { return _major_version; }
447 void set_major_version(u2 major_version) { _major_version = major_version; }
448
449 // source debug extension
450 symbolOop source_debug_extension() const { return _source_debug_extension; }
451 void set_source_debug_extension(symbolOop n){ oop_store_without_check((oop*) &_source_debug_extension, (oop) n); }
452
453 // nonstatic oop-map blocks
454 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
455 return oop_map_count * OopMapBlock::size_in_words();
456 }
457 unsigned int nonstatic_oop_map_count() const {
458 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
459 }
460 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
461 void set_nonstatic_oop_map_size(int words) {
462 _nonstatic_oop_map_size = words;
463 }
464
465 // RedefineClasses() support for previous versions:
466 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods,
467 int emcp_method_count);
468 // If the _previous_versions array is non-NULL, then this klass
469 // has been redefined at least once even if we aren't currently
470 // tracking a previous version.
471 bool has_been_redefined() const { return _previous_versions != NULL; }
472 bool has_previous_version() const;
473 void init_previous_versions() {
474 _previous_versions = NULL;
475 }
476 GrowableArray<PreviousVersionNode *>* previous_versions() const {
477 return _previous_versions;
478 }
479
480 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
481 void set_cached_class_file(unsigned char *class_file_bytes,
482 jint class_file_len) { _cached_class_file_len = class_file_len;
483 _cached_class_file_bytes = class_file_bytes; }
484 jint get_cached_class_file_len() { return _cached_class_file_len; }
485 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; }
486
487 // JVMTI: Support for caching of field indices, types, and offsets
488 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
489 _jvmti_cached_class_field_map = descriptor;
490 }
491 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
492 return _jvmti_cached_class_field_map;
493 }
494
495 // for adding methods, constMethodOopDesc::UNSET_IDNUM means no more ids available
496 inline u2 next_method_idnum();
497 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
498
499 // generics support
500 symbolOop generic_signature() const { return _generic_signature; }
501 void set_generic_signature(symbolOop sig) { oop_store_without_check((oop*)&_generic_signature, (oop)sig); }
502 u2 enclosing_method_class_index() const { return _enclosing_method_class_index; }
503 u2 enclosing_method_method_index() const { return _enclosing_method_method_index; }
504 void set_enclosing_method_indices(u2 class_index,
505 u2 method_index) { _enclosing_method_class_index = class_index;
506 _enclosing_method_method_index = method_index; }
507
508 // JSR 292 support
509 oop bootstrap_method() const { return _bootstrap_method; }
510 void set_bootstrap_method(oop mh) { oop_store(&_bootstrap_method, mh); }
511
512 // jmethodID support
513 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
514 methodHandle method_h);
515 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
516 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
517 jmethodID* to_dealloc_id_p,
518 jmethodID** to_dealloc_jmeths_p);
519 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
520 size_t *length_p, jmethodID* id_p);
521 jmethodID jmethod_id_or_null(methodOop method);
522
523 // cached itable index support
524 void set_cached_itable_index(size_t idnum, int index);
525 int cached_itable_index(size_t idnum);
526
527 // annotations support
528 typeArrayOop class_annotations() const { return _class_annotations; }
529 objArrayOop fields_annotations() const { return _fields_annotations; }
530 objArrayOop methods_annotations() const { return _methods_annotations; }
531 objArrayOop methods_parameter_annotations() const { return _methods_parameter_annotations; }
532 objArrayOop methods_default_annotations() const { return _methods_default_annotations; }
533 void set_class_annotations(typeArrayOop md) { oop_store_without_check((oop*)&_class_annotations, (oop)md); }
534 void set_fields_annotations(objArrayOop md) { set_annotations(md, &_fields_annotations); }
535 void set_methods_annotations(objArrayOop md) { set_annotations(md, &_methods_annotations); }
536 void set_methods_parameter_annotations(objArrayOop md) { set_annotations(md, &_methods_parameter_annotations); }
537 void set_methods_default_annotations(objArrayOop md) { set_annotations(md, &_methods_default_annotations); }
538 typeArrayOop get_method_annotations_of(int idnum)
539 { return get_method_annotations_from(idnum, _methods_annotations); }
540 typeArrayOop get_method_parameter_annotations_of(int idnum)
541 { return get_method_annotations_from(idnum, _methods_parameter_annotations); }
542 typeArrayOop get_method_default_annotations_of(int idnum)
543 { return get_method_annotations_from(idnum, _methods_default_annotations); }
544 void set_method_annotations_of(int idnum, typeArrayOop anno)
545 { set_methods_annotations_of(idnum, anno, &_methods_annotations); }
546 void set_method_parameter_annotations_of(int idnum, typeArrayOop anno)
547 { set_methods_annotations_of(idnum, anno, &_methods_annotations); }
548 void set_method_default_annotations_of(int idnum, typeArrayOop anno)
549 { set_methods_annotations_of(idnum, anno, &_methods_annotations); }
550
551 // allocation
552 DEFINE_ALLOCATE_PERMANENT(instanceKlass);
553 instanceOop allocate_instance(TRAPS);
554 instanceOop allocate_permanent_instance(TRAPS);
555
556 // additional member function to return a handle
557 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
558
559 objArrayOop allocate_objArray(int n, int length, TRAPS);
560 // Helper function
561 static instanceOop register_finalizer(instanceOop i, TRAPS);
562
563 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
564 // if not, throw either an Error or an Exception.
565 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
566
567 // initialization
568 void call_class_initializer(TRAPS);
569 void set_initialization_state_and_notify(ClassState state, TRAPS);
570
571 // OopMapCache support
572 OopMapCache* oop_map_cache() { return _oop_map_cache; }
573 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
574 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
575
576 // JNI identifier support (for static fields - for jni performance)
577 JNIid* jni_ids() { return _jni_ids; }
578 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
579 JNIid* jni_id_for(int offset);
580
581 // maintenance of deoptimization dependencies
582 int mark_dependent_nmethods(DepChange& changes);
583 void add_dependent_nmethod(nmethod* nm);
584 void remove_dependent_nmethod(nmethod* nm);
585
586 // On-stack replacement support
587 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
588 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
589 void add_osr_nmethod(nmethod* n);
590 void remove_osr_nmethod(nmethod* n);
591 nmethod* lookup_osr_nmethod(const methodOop m, int bci, int level, bool match_level) const;
592
593 // Breakpoint support (see methods on methodOop for details)
594 BreakpointInfo* breakpoints() const { return _breakpoints; };
595 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
596
597 // support for stub routines
598 static int init_state_offset_in_bytes() { return offset_of(instanceKlass, _init_state); }
599 static int init_thread_offset_in_bytes() { return offset_of(instanceKlass, _init_thread); }
600
601 // subclass/subinterface checks
602 bool implements_interface(klassOop k) const;
603
604 // Access to implementors of an interface. We only store the count
605 // of implementors, and in case, there are only a few
606 // implementors, we store them in a short list.
607 // This accessor returns NULL if we walk off the end of the list.
608 klassOop implementor(int i) const {
609 return (i < implementors_limit)? _implementors[i]: (klassOop) NULL;
610 }
611 int nof_implementors() const { return _nof_implementors; }
612 void add_implementor(klassOop k); // k is a new class that implements this interface
613 void init_implementor(); // initialize
614
615 // link this class into the implementors list of every interface it implements
616 void process_interfaces(Thread *thread);
617
618 // virtual operations from Klass
619 bool is_leaf_class() const { return _subklass == NULL; }
620 objArrayOop compute_secondary_supers(int num_extra_slots, TRAPS);
621 bool compute_is_subtype_of(klassOop k);
622 bool can_be_primary_super_slow() const;
623 klassOop java_super() const { return super(); }
624 int oop_size(oop obj) const { return size_helper(); }
625 int klass_oop_size() const { return object_size(); }
626 bool oop_is_instance_slow() const { return true; }
627
628 // Iterators
629 void do_local_static_fields(FieldClosure* cl);
630 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
631 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS);
632
633 void methods_do(void f(methodOop method));
634 void array_klasses_do(void f(klassOop k));
635 void with_array_klasses_do(void f(klassOop k));
636 bool super_types_do(SuperTypeClosure* blk);
637
638 // Casting from klassOop
639 static instanceKlass* cast(klassOop k) {
640 Klass* kp = k->klass_part();
641 assert(kp->null_vtbl() || kp->oop_is_instance_slow(), "cast to instanceKlass");
642 return (instanceKlass*) kp;
643 }
644
645 // Sizing (in words)
646 static int header_size() { return align_object_offset(oopDesc::header_size() + sizeof(instanceKlass)/HeapWordSize); }
647 int object_size() const { return object_size(align_object_offset(vtable_length()) + align_object_offset(itable_length()) + static_field_size() + nonstatic_oop_map_size()); }
648 static int vtable_start_offset() { return header_size(); }
649 static int vtable_length_offset() { return oopDesc::header_size() + offset_of(instanceKlass, _vtable_len) / HeapWordSize; }
650 static int object_size(int extra) { return align_object_size(header_size() + extra); }
651
652 intptr_t* start_of_vtable() const { return ((intptr_t*)as_klassOop()) + vtable_start_offset(); }
653 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
654 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)as_klassOop(); }
655
656 // Static field offset is an offset into the Heap, should be converted by
657 // based on UseCompressedOop for traversal
658 HeapWord* start_of_static_fields() const {
659 return (HeapWord*)(start_of_itable() + align_object_offset(itable_length()));
660 }
661
662 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
663
664 int offset_of_static_fields() const {
665 return (intptr_t)start_of_static_fields() - (intptr_t)as_klassOop();
666 }
667
668 OopMapBlock* start_of_nonstatic_oop_maps() const {
669 return (OopMapBlock*) (start_of_static_fields() + static_field_size());
670 }
671
672 // Allocation profiling support
673 juint alloc_size() const { return _alloc_count * size_helper(); }
674 void set_alloc_size(juint n) {}
675
676 // Use this to return the size of an instance in heap words:
677 int size_helper() const {
678 return layout_helper_to_size_helper(layout_helper());
679 }
680
681 // This bit is initialized in classFileParser.cpp.
682 // It is false under any of the following conditions:
683 // - the class is abstract (including any interface)
684 // - the class has a finalizer (if !RegisterFinalizersAtInit)
685 // - the class size is larger than FastAllocateSizeLimit
686 // - the class is java/lang/Class, which cannot be allocated directly
687 bool can_be_fastpath_allocated() const {
688 return !layout_helper_needs_slow_path(layout_helper());
689 }
690
691 // Java vtable/itable
692 klassVtable* vtable() const; // return new klassVtable wrapper
693 inline methodOop method_at_vtable(int index);
694 klassItable* itable() const; // return new klassItable wrapper
695 methodOop method_at_itable(klassOop holder, int index, TRAPS);
696
697 // Garbage collection
698 void oop_follow_contents(oop obj);
699 void follow_static_fields();
700 void adjust_static_fields();
701 int oop_adjust_pointers(oop obj);
702 bool object_is_parsable() const { return _init_state != unparsable_by_gc; }
703 // Value of _init_state must be zero (unparsable_by_gc) when klass field is set.
704
705 void follow_weak_klass_links(
706 BoolObjectClosure* is_alive, OopClosure* keep_alive);
707 void release_C_heap_structures();
708
709 // Parallel Scavenge and Parallel Old
710 PARALLEL_GC_DECLS
711
712 #ifndef SERIALGC
713 // Parallel Scavenge
714 void push_static_fields(PSPromotionManager* pm);
715
716 // Parallel Old
717 void follow_static_fields(ParCompactionManager* cm);
718 void copy_static_fields(ParCompactionManager* cm);
719 void update_static_fields();
720 void update_static_fields(HeapWord* beg_addr, HeapWord* end_addr);
721 #endif // SERIALGC
722
723 // Naming
724 const char* signature_name() const;
725
726 // Iterators
727 int oop_oop_iterate(oop obj, OopClosure* blk) {
728 return oop_oop_iterate_v(obj, blk);
729 }
730
731 int oop_oop_iterate_m(oop obj, OopClosure* blk, MemRegion mr) {
732 return oop_oop_iterate_v_m(obj, blk, mr);
733 }
734
735 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
736 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
737 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
738 MemRegion mr);
739
740 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
741 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
742
743 #ifndef SERIALGC
744 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
745 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
746
747 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
748 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
749 #endif // !SERIALGC
750
751 void iterate_static_fields(OopClosure* closure);
752 void iterate_static_fields(OopClosure* closure, MemRegion mr);
753
754 private:
755 // initialization state
756 #ifdef ASSERT
757 void set_init_state(ClassState state);
758 #else
759 void set_init_state(ClassState state) { _init_state = state; }
760 #endif
761 void set_rewritten() { _rewritten = true; }
762 void set_init_thread(Thread *thread) { _init_thread = thread; }
763
764 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
765 // The RedefineClasses() API can cause new method idnums to be needed
766 // which will cause the caches to grow. Safety requires different
767 // cache management logic if the caches can grow instead of just
768 // going from NULL to non-NULL.
769 bool idnum_can_increment() const { return has_been_redefined(); }
770 jmethodID* methods_jmethod_ids_acquire() const
771 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
772 void release_set_methods_jmethod_ids(jmethodID* jmeths)
773 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
774
775 int* methods_cached_itable_indices_acquire() const
776 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); }
777 void release_set_methods_cached_itable_indices(int* indices)
778 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); }
779
780 inline typeArrayOop get_method_annotations_from(int idnum, objArrayOop annos);
781 void set_annotations(objArrayOop md, objArrayOop* md_p) { oop_store_without_check((oop*)md_p, (oop)md); }
782 void set_methods_annotations_of(int idnum, typeArrayOop anno, objArrayOop* md_p);
783
784 // Offsets for memory management
785 oop* adr_array_klasses() const { return (oop*)&this->_array_klasses;}
786 oop* adr_methods() const { return (oop*)&this->_methods;}
787 oop* adr_method_ordering() const { return (oop*)&this->_method_ordering;}
788 oop* adr_local_interfaces() const { return (oop*)&this->_local_interfaces;}
789 oop* adr_transitive_interfaces() const { return (oop*)&this->_transitive_interfaces;}
790 oop* adr_fields() const { return (oop*)&this->_fields;}
791 oop* adr_constants() const { return (oop*)&this->_constants;}
792 oop* adr_class_loader() const { return (oop*)&this->_class_loader;}
793 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;}
794 oop* adr_host_klass() const { return (oop*)&this->_host_klass;}
795 oop* adr_signers() const { return (oop*)&this->_signers;}
796 oop* adr_source_file_name() const { return (oop*)&this->_source_file_name;}
797 oop* adr_source_debug_extension() const { return (oop*)&this->_source_debug_extension;}
798 oop* adr_inner_classes() const { return (oop*)&this->_inner_classes;}
799 oop* adr_implementors() const { return (oop*)&this->_implementors[0];}
800 oop* adr_generic_signature() const { return (oop*)&this->_generic_signature;}
801 oop* adr_bootstrap_method() const { return (oop*)&this->_bootstrap_method;}
802 oop* adr_methods_jmethod_ids() const { return (oop*)&this->_methods_jmethod_ids;}
803 oop* adr_methods_cached_itable_indices() const { return (oop*)&this->_methods_cached_itable_indices;}
804 oop* adr_class_annotations() const { return (oop*)&this->_class_annotations;}
805 oop* adr_fields_annotations() const { return (oop*)&this->_fields_annotations;}
806 oop* adr_methods_annotations() const { return (oop*)&this->_methods_annotations;}
807 oop* adr_methods_parameter_annotations() const { return (oop*)&this->_methods_parameter_annotations;}
808 oop* adr_methods_default_annotations() const { return (oop*)&this->_methods_default_annotations;}
809
810 // Static methods that are used to implement member methods where an exposed this pointer
811 // is needed due to possible GCs
812 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
813 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
814 static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
815 static void eager_initialize_impl (instanceKlassHandle this_oop);
816 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
817 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
818 static klassOop array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
819 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS);
820 /* jni_id_for_impl for jfieldID only */
821 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
822
823 // Returns the array class for the n'th dimension
824 klassOop array_klass_impl(bool or_null, int n, TRAPS);
825
826 // Returns the array class with this class as element type
827 klassOop array_klass_impl(bool or_null, TRAPS);
828
829 public:
830 // sharing support
831 virtual void remove_unshareable_info();
832 void field_names_and_sigs_iterate(OopClosure* closure);
833
834 // jvm support
835 jint compute_modifier_flags(TRAPS) const;
836
837 public:
838 // JVMTI support
839 jint jvmti_class_status() const;
840
841 public:
842 // Printing
843 void oop_print_value_on(oop obj, outputStream* st);
844 #ifndef PRODUCT
845 void oop_print_on (oop obj, outputStream* st);
846
847 void print_dependent_nmethods(bool verbose = false);
848 bool is_dependent_nmethod(nmethod* nm);
849 #endif
850
851 // Verification
852 const char* internal_name() const;
853 void oop_verify_on(oop obj, outputStream* st);
854
855 #ifndef PRODUCT
856 static void verify_class_klass_nonstatic_oop_maps(klassOop k) PRODUCT_RETURN;
857 #endif
858 };
859
860 inline methodOop instanceKlass::method_at_vtable(int index) {
861 #ifndef PRODUCT
862 assert(index >= 0, "valid vtable index");
863 if (DebugVtables) {
864 verify_vtable_index(index);
865 }
866 #endif
867 vtableEntry* ve = (vtableEntry*)start_of_vtable();
868 return ve[index].method();
869 }
870
871 inline typeArrayOop instanceKlass::get_method_annotations_from(int idnum, objArrayOop annos) {
872 if (annos == NULL || annos->length() <= idnum) {
873 return NULL;
874 }
875 return typeArrayOop(annos->obj_at(idnum));
876 }
877
878 // for adding methods
879 // UNSET_IDNUM return means no more ids available
880 inline u2 instanceKlass::next_method_idnum() {
881 if (_idnum_allocated_count == constMethodOopDesc::MAX_IDNUM) {
882 return constMethodOopDesc::UNSET_IDNUM; // no more ids available
883 } else {
884 return _idnum_allocated_count++;
885 }
886 }
887
888
889 /* JNIid class for jfieldIDs only */
890 class JNIid: public CHeapObj {
891 friend class VMStructs;
892 private:
893 klassOop _holder;
894 JNIid* _next;
895 int _offset;
896 #ifdef ASSERT
897 bool _is_static_field_id;
898 #endif
899
900 public:
901 // Accessors
902 klassOop holder() const { return _holder; }
903 int offset() const { return _offset; }
904 JNIid* next() { return _next; }
905 // Constructor
906 JNIid(klassOop holder, int offset, JNIid* next);
907 // Identifier lookup
908 JNIid* find(int offset);
909
910 // Garbage collection support
911 oop* holder_addr() { return (oop*)&_holder; }
912 void oops_do(OopClosure* f);
913 static void deallocate(JNIid* id);
914 // Debugging
915 #ifdef ASSERT
916 bool is_static_field_id() const { return _is_static_field_id; }
917 void set_is_static_field_id() { _is_static_field_id = true; }
918 #endif
919 void verify(klassOop holder);
920 };
921
922
923 // If breakpoints are more numerous than just JVMTI breakpoints,
924 // consider compressing this data structure.
925 // It is currently a simple linked list defined in methodOop.hpp.
926
927 class BreakpointInfo;
928
929
930 // A collection point for interesting information about the previous
931 // version(s) of an instanceKlass. This class uses weak references to
932 // the information so that the information may be collected as needed
933 // by the system. If the information is shared, then a regular
934 // reference must be used because a weak reference would be seen as
935 // collectible. A GrowableArray of PreviousVersionNodes is attached
936 // to the instanceKlass as needed. See PreviousVersionWalker below.
937 class PreviousVersionNode : public CHeapObj {
938 private:
939 // A shared ConstantPool is never collected so we'll always have
940 // a reference to it so we can update items in the cache. We'll
941 // have a weak reference to a non-shared ConstantPool until all
942 // of the methods (EMCP or obsolete) have been collected; the
943 // non-shared ConstantPool becomes collectible at that point.
944 jobject _prev_constant_pool; // regular or weak reference
945 bool _prev_cp_is_weak; // true if not a shared ConstantPool
946
947 // If the previous version of the instanceKlass doesn't have any
948 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the
949 // EMCP methods have been collected, then _prev_EMCP_methods can
950 // have a length of zero.
951 GrowableArray<jweak>* _prev_EMCP_methods;
952
953 public:
954 PreviousVersionNode(jobject prev_constant_pool, bool prev_cp_is_weak,
955 GrowableArray<jweak>* prev_EMCP_methods);
956 ~PreviousVersionNode();
957 jobject prev_constant_pool() const {
958 return _prev_constant_pool;
959 }
960 GrowableArray<jweak>* prev_EMCP_methods() const {
961 return _prev_EMCP_methods;
962 }
963 };
964
965
966 // A Handle-ized version of PreviousVersionNode.
967 class PreviousVersionInfo : public ResourceObj {
968 private:
969 constantPoolHandle _prev_constant_pool_handle;
970 // If the previous version of the instanceKlass doesn't have any
971 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the
972 // methods cannot be collected while we hold a handle,
973 // _prev_EMCP_methods should never have a length of zero.
974 GrowableArray<methodHandle>* _prev_EMCP_method_handles;
975
976 public:
977 PreviousVersionInfo(PreviousVersionNode *pv_node);
978 ~PreviousVersionInfo();
979 constantPoolHandle prev_constant_pool_handle() const {
980 return _prev_constant_pool_handle;
981 }
982 GrowableArray<methodHandle>* prev_EMCP_method_handles() const {
983 return _prev_EMCP_method_handles;
984 }
985 };
986
987
988 // Helper object for walking previous versions. This helper cleans up
989 // the Handles that it allocates when the helper object is destroyed.
990 // The PreviousVersionInfo object returned by next_previous_version()
991 // is only valid until a subsequent call to next_previous_version() or
992 // the helper object is destroyed.
993 class PreviousVersionWalker : public StackObj {
994 private:
995 GrowableArray<PreviousVersionNode *>* _previous_versions;
996 int _current_index;
997 // Fields for cleaning up when we are done walking the previous versions:
998 // A HandleMark for the PreviousVersionInfo handles:
999 HandleMark _hm;
1000
1001 // It would be nice to have a ResourceMark field in this helper also,
1002 // but the ResourceMark code says to be careful to delete handles held
1003 // in GrowableArrays _before_ deleting the GrowableArray. Since we
1004 // can't guarantee the order in which the fields are destroyed, we
1005 // have to let the creator of the PreviousVersionWalker object do
1006 // the right thing. Also, adding a ResourceMark here causes an
1007 // include loop.
1008
1009 // A pointer to the current info object so we can handle the deletes.
1010 PreviousVersionInfo * _current_p;
1011
1012 public:
1013 PreviousVersionWalker(instanceKlass *ik);
1014 ~PreviousVersionWalker();
1015
1016 // Return the interesting information for the next previous version
1017 // of the klass. Returns NULL if there are no more previous versions.
1018 PreviousVersionInfo* next_previous_version();
1019 };