1 /*
2 * Copyright (c) 1997, 2015, 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 #ifndef SHARE_VM_OOPS_INSTANCEKLASS_HPP
26 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP
27
28 #include "classfile/classLoaderData.hpp"
29 #include "gc/shared/specialized_oop_closures.hpp"
30 #include "logging/logLevel.hpp"
31 #include "memory/referenceType.hpp"
32 #include "oops/annotations.hpp"
33 #include "oops/constMethod.hpp"
34 #include "oops/fieldInfo.hpp"
35 #include "oops/instanceOop.hpp"
36 #include "oops/klassVtable.hpp"
37 #include "runtime/handles.hpp"
38 #include "runtime/os.hpp"
39 #include "trace/traceMacros.hpp"
40 #include "utilities/accessFlags.hpp"
41 #include "utilities/bitMap.inline.hpp"
42 #include "utilities/macros.hpp"
43
44 // An InstanceKlass is the VM level representation of a Java class.
45 // It contains all information needed for at class at execution runtime.
46
47 // InstanceKlass embedded field layout (after declared fields):
48 // [EMBEDDED Java vtable ] size in words = vtable_len
49 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
50 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
51 // indicating where oops are located in instances of this klass.
52 // [EMBEDDED implementor of the interface] only exist for interface
53 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled)
54
55
56 // forward declaration for class -- see below for definition
57 class SuperTypeClosure;
58 class JNIid;
59 class jniIdMapBase;
60 class BreakpointInfo;
61 class fieldDescriptor;
62 class DepChange;
63 class nmethodBucket;
64 class JvmtiCachedClassFieldMap;
65 class MemberNameTable;
66
67 // This is used in iterators below.
68 class FieldClosure: public StackObj {
69 public:
70 virtual void do_field(fieldDescriptor* fd) = 0;
71 };
72
73 #ifndef PRODUCT
74 // Print fields.
75 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
76 class FieldPrinter: public FieldClosure {
77 oop _obj;
78 outputStream* _st;
79 public:
80 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
81 void do_field(fieldDescriptor* fd);
82 };
83 #endif // !PRODUCT
84
85 // ValueObjs embedded in klass. Describes where oops are located in instances of
86 // this klass.
87 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
88 public:
89 // Byte offset of the first oop mapped by this block.
90 int offset() const { return _offset; }
91 void set_offset(int offset) { _offset = offset; }
92
93 // Number of oops in this block.
94 uint count() const { return _count; }
95 void set_count(uint count) { _count = count; }
96
97 // sizeof(OopMapBlock) in HeapWords.
98 static const int size_in_words() {
99 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
100 LogHeapWordSize;
101 }
102
103 private:
104 int _offset;
105 uint _count;
106 };
107
108 struct JvmtiCachedClassFileData;
109
110 class InstanceKlass: public Klass {
111 friend class VMStructs;
112 friend class ClassFileParser;
113 friend class CompileReplay;
114
115 protected:
116 // Constructor
117 InstanceKlass(int vtable_len,
118 int itable_len,
119 int static_field_size,
120 int nonstatic_oop_map_size,
121 unsigned kind,
122 ReferenceType rt,
123 AccessFlags access_flags,
124 bool is_anonymous);
125 public:
126 static InstanceKlass* allocate_instance_klass(
127 ClassLoaderData* loader_data,
128 int vtable_len,
129 int itable_len,
130 int static_field_size,
131 int nonstatic_oop_map_size,
132 ReferenceType rt,
133 AccessFlags access_flags,
134 Symbol* name,
135 Klass* super_klass,
136 bool is_anonymous,
137 TRAPS);
138
139 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
140
141 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
142 // of the class loading & initialization procedure, and the use of the states.
143 enum ClassState {
144 allocated, // allocated (but not yet linked)
145 loaded, // loaded and inserted in class hierarchy (but not linked yet)
146 linked, // successfully linked/verified (but not initialized yet)
147 being_initialized, // currently running class initializer
148 fully_initialized, // initialized (successfull final state)
149 initialization_error // error happened during initialization
150 };
151
152 static int number_of_instance_classes() { return _total_instanceKlass_count; }
153
154 private:
155 static volatile int _total_instanceKlass_count;
156
157 protected:
158 // Annotations for this class
159 Annotations* _annotations;
160 // Array classes holding elements of this class.
161 Klass* _array_klasses;
162 // Constant pool for this class.
163 ConstantPool* _constants;
164 // The InnerClasses attribute and EnclosingMethod attribute. The
165 // _inner_classes is an array of shorts. If the class has InnerClasses
166 // attribute, then the _inner_classes array begins with 4-tuples of shorts
167 // [inner_class_info_index, outer_class_info_index,
168 // inner_name_index, inner_class_access_flags] for the InnerClasses
169 // attribute. If the EnclosingMethod attribute exists, it occupies the
170 // last two shorts [class_index, method_index] of the array. If only
171 // the InnerClasses attribute exists, the _inner_classes array length is
172 // number_of_inner_classes * 4. If the class has both InnerClasses
173 // and EnclosingMethod attributes the _inner_classes array length is
174 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
175 Array<jushort>* _inner_classes;
176
177 // the source debug extension for this klass, NULL if not specified.
178 // Specified as UTF-8 string without terminating zero byte in the classfile,
179 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
180 char* _source_debug_extension;
181 // Array name derived from this class which needs unreferencing
182 // if this class is unloaded.
183 Symbol* _array_name;
184
185 // Number of heapOopSize words used by non-static fields in this klass
186 // (including inherited fields but after header_size()).
187 int _nonstatic_field_size;
188 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
189 // Constant pool index to the utf8 entry of the Generic signature,
190 // or 0 if none.
191 u2 _generic_signature_index;
192 // Constant pool index to the utf8 entry for the name of source file
193 // containing this klass, 0 if not specified.
194 u2 _source_file_name_index;
195 u2 _static_oop_field_count;// number of static oop fields in this klass
196 u2 _java_fields_count; // The number of declared Java fields
197 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
198
199 // _is_marked_dependent can be set concurrently, thus cannot be part of the
200 // _misc_flags.
201 bool _is_marked_dependent; // used for marking during flushing and deoptimization
202 bool _has_unloaded_dependent;
203
204 // The low two bits of _misc_flags contains the kind field.
205 // This can be used to quickly discriminate among the four kinds of
206 // InstanceKlass.
207
208 static const unsigned _misc_kind_field_size = 2;
209 static const unsigned _misc_kind_field_pos = 0;
210 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
211
212 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
213 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
214 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
215 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
216
217 // Start after _misc_kind field.
218 enum {
219 _misc_rewritten = 1 << 2, // methods rewritten.
220 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops
221 _misc_should_verify_class = 1 << 4, // allow caching of preverification
222 _misc_is_anonymous = 1 << 5, // has embedded _host_klass field
223 _misc_is_contended = 1 << 6, // marked with contended annotation
224 _misc_has_default_methods = 1 << 7, // class/superclass/implemented interfaces has default methods
225 _misc_declares_default_methods = 1 << 8, // directly declares default methods (any access)
226 _misc_has_been_redefined = 1 << 9, // class has been redefined
227 _misc_is_scratch_class = 1 << 10 // class is the redefined scratch class
228 };
229 u2 _misc_flags;
230 u2 _minor_version; // minor version number of class file
231 u2 _major_version; // major version number of class file
232 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
233 int _vtable_len; // length of Java vtable (in words)
234 int _itable_len; // length of Java itable (in words)
235 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
236 MemberNameTable* _member_names; // Member names
237 JNIid* _jni_ids; // First JNI identifier for static fields in this class
238 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
239 nmethodBucket* _dependencies; // list of dependent nmethods
240 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
241 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
242 // Linked instanceKlasses of previous versions
243 InstanceKlass* _previous_versions;
244 // JVMTI fields can be moved to their own structure - see 6315920
245 // JVMTI: cached class file, before retransformable agent modified it in CFLH
246 JvmtiCachedClassFileData* _cached_class_file;
247
248 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
249
250 // Class states are defined as ClassState (see above).
251 // Place the _init_state here to utilize the unused 2-byte after
252 // _idnum_allocated_count.
253 u1 _init_state; // state of class
254 u1 _reference_type; // reference type
255
256 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
257
258 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
259
260 // Method array.
261 Array<Method*>* _methods;
262 // Default Method Array, concrete methods inherited from interfaces
263 Array<Method*>* _default_methods;
264 // Interface (Klass*s) this class declares locally to implement.
265 Array<Klass*>* _local_interfaces;
266 // Interface (Klass*s) this class implements transitively.
267 Array<Klass*>* _transitive_interfaces;
268 // Int array containing the original order of method in the class file (for JVMTI).
269 Array<int>* _method_ordering;
270 // Int array containing the vtable_indices for default_methods
271 // offset matches _default_methods offset
272 Array<int>* _default_vtable_indices;
273
274 // Instance and static variable information, starts with 6-tuples of shorts
275 // [access, name index, sig index, initval index, low_offset, high_offset]
276 // for all fields, followed by the generic signature data at the end of
277 // the array. Only fields with generic signature attributes have the generic
278 // signature data set in the array. The fields array looks like following:
279 //
280 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
281 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
282 // ...
283 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
284 // [generic signature index]
285 // [generic signature index]
286 // ...
287 Array<u2>* _fields;
288
289 // embedded Java vtable follows here
290 // embedded Java itables follows here
291 // embedded static fields follows here
292 // embedded nonstatic oop-map blocks follows here
293 // embedded implementor of this interface follows here
294 // The embedded implementor only exists if the current klass is an
295 // iterface. The possible values of the implementor fall into following
296 // three cases:
297 // NULL: no implementor.
298 // A Klass* that's not itself: one implementor.
299 // Itself: more than one implementors.
300 // embedded host klass follows here
301 // The embedded host klass only exists in an anonymous class for
302 // dynamic language support (JSR 292 enabled). The host class grants
303 // its access privileges to this class also. The host class is either
304 // named, or a previously loaded anonymous class. A non-anonymous class
305 // or an anonymous class loaded through normal classloading does not
306 // have this embedded field.
307 //
308
309 friend class SystemDictionary;
310
311 public:
312 bool has_nonstatic_fields() const {
313 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
314 }
315 void set_has_nonstatic_fields(bool b) {
316 if (b) {
317 _misc_flags |= _misc_has_nonstatic_fields;
318 } else {
319 _misc_flags &= ~_misc_has_nonstatic_fields;
320 }
321 }
322
323 // field sizes
324 int nonstatic_field_size() const { return _nonstatic_field_size; }
325 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
326
327 int static_field_size() const { return _static_field_size; }
328 void set_static_field_size(int size) { _static_field_size = size; }
329
330 int static_oop_field_count() const { return (int)_static_oop_field_count; }
331 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
332
333 // Java vtable
334 int vtable_length() const { return _vtable_len; }
335 void set_vtable_length(int len) { _vtable_len = len; }
336
337 // Java itable
338 int itable_length() const { return _itable_len; }
339 void set_itable_length(int len) { _itable_len = len; }
340
341 // array klasses
342 Klass* array_klasses() const { return _array_klasses; }
343 void set_array_klasses(Klass* k) { _array_klasses = k; }
344
345 // methods
346 Array<Method*>* methods() const { return _methods; }
347 void set_methods(Array<Method*>* a) { _methods = a; }
348 Method* method_with_idnum(int idnum);
349 Method* method_with_orig_idnum(int idnum);
350 Method* method_with_orig_idnum(int idnum, int version);
351
352 // method ordering
353 Array<int>* method_ordering() const { return _method_ordering; }
354 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
355 void copy_method_ordering(intArray* m, TRAPS);
356
357 // default_methods
358 Array<Method*>* default_methods() const { return _default_methods; }
359 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
360
361 // default method vtable_indices
362 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
363 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
364 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
365
366 // interfaces
367 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
368 void set_local_interfaces(Array<Klass*>* a) {
369 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
370 _local_interfaces = a; }
371
372 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
373 void set_transitive_interfaces(Array<Klass*>* a) {
374 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
375 _transitive_interfaces = a;
376 }
377
378 private:
379 friend class fieldDescriptor;
380 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
381
382 public:
383 int field_offset (int index) const { return field(index)->offset(); }
384 int field_access_flags(int index) const { return field(index)->access_flags(); }
385 Symbol* field_name (int index) const { return field(index)->name(constants()); }
386 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
387
388 // Number of Java declared fields
389 int java_fields_count() const { return (int)_java_fields_count; }
390
391 Array<u2>* fields() const { return _fields; }
392 void set_fields(Array<u2>* f, u2 java_fields_count) {
393 guarantee(_fields == NULL || f == NULL, "Just checking");
394 _fields = f;
395 _java_fields_count = java_fields_count;
396 }
397
398 // inner classes
399 Array<u2>* inner_classes() const { return _inner_classes; }
400 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
401
402 enum InnerClassAttributeOffset {
403 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
404 inner_class_inner_class_info_offset = 0,
405 inner_class_outer_class_info_offset = 1,
406 inner_class_inner_name_offset = 2,
407 inner_class_access_flags_offset = 3,
408 inner_class_next_offset = 4
409 };
410
411 enum EnclosingMethodAttributeOffset {
412 enclosing_method_class_index_offset = 0,
413 enclosing_method_method_index_offset = 1,
414 enclosing_method_attribute_size = 2
415 };
416
417 // method override check
418 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
419
420 // package
421 bool is_same_class_package(Klass* class2);
422 bool is_same_class_package(oop classloader2, Symbol* classname2);
423 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
424
425 // find an enclosing class
426 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) {
427 instanceKlassHandle self(THREAD, this);
428 return compute_enclosing_class_impl(self, inner_is_member, THREAD);
429 }
430 static Klass* compute_enclosing_class_impl(instanceKlassHandle self,
431 bool* inner_is_member, TRAPS);
432
433 // Find InnerClasses attribute for k and return outer_class_info_index & inner_name_index.
434 static bool find_inner_classes_attr(instanceKlassHandle k,
435 int* ooff, int* noff, TRAPS);
436
437 // tell if two classes have the same enclosing class (at package level)
438 bool is_same_package_member(Klass* class2, TRAPS) {
439 instanceKlassHandle self(THREAD, this);
440 return is_same_package_member_impl(self, class2, THREAD);
441 }
442 static bool is_same_package_member_impl(instanceKlassHandle self,
443 Klass* class2, TRAPS);
444
445 // initialization state
446 bool is_loaded() const { return _init_state >= loaded; }
447 bool is_linked() const { return _init_state >= linked; }
448 bool is_initialized() const { return _init_state == fully_initialized; }
449 bool is_not_initialized() const { return _init_state < being_initialized; }
450 bool is_being_initialized() const { return _init_state == being_initialized; }
451 bool is_in_error_state() const { return _init_state == initialization_error; }
452 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
453 ClassState init_state() { return (ClassState)_init_state; }
454 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
455
456 // defineClass specified verification
457 bool should_verify_class() const {
458 return (_misc_flags & _misc_should_verify_class) != 0;
459 }
460 void set_should_verify_class(bool value) {
461 if (value) {
462 _misc_flags |= _misc_should_verify_class;
463 } else {
464 _misc_flags &= ~_misc_should_verify_class;
465 }
466 }
467
468 // marking
469 bool is_marked_dependent() const { return _is_marked_dependent; }
470 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
471
472 bool has_unloaded_dependent() const { return _has_unloaded_dependent; }
473 void set_has_unloaded_dependent(bool value) { _has_unloaded_dependent = value; }
474
475 // initialization (virtuals from Klass)
476 bool should_be_initialized() const; // means that initialize should be called
477 void initialize(TRAPS);
478 void link_class(TRAPS);
479 bool link_class_or_fail(TRAPS); // returns false on failure
480 void unlink_class();
481 void rewrite_class(TRAPS);
482 void link_methods(TRAPS);
483 Method* class_initializer();
484
485 // set the class to initialized if no static initializer is present
486 void eager_initialize(Thread *thread);
487
488 // reference type
489 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
490 void set_reference_type(ReferenceType t) {
491 assert(t == (u1)t, "overflow");
492 _reference_type = (u1)t;
493 }
494
495 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
496
497 // find local field, returns true if found
498 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
499 // find field in direct superinterfaces, returns the interface in which the field is defined
500 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
501 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
502 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
503 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
504 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
505
506 // find a non-static or static field given its offset within the class.
507 bool contains_field_offset(int offset) {
508 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
509 }
510
511 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
512 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
513
514 // find a local method (returns NULL if not found)
515 Method* find_method(Symbol* name, Symbol* signature) const;
516 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
517
518 // find a local method, but skip static methods
519 Method* find_instance_method(Symbol* name, Symbol* signature);
520 static Method* find_instance_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
521
522 // find a local method (returns NULL if not found)
523 Method* find_local_method(Symbol* name, Symbol* signature,
524 OverpassLookupMode overpass_mode,
525 StaticLookupMode static_mode,
526 PrivateLookupMode private_mode) const;
527
528 // find a local method from given methods array (returns NULL if not found)
529 static Method* find_local_method(Array<Method*>* methods,
530 Symbol* name, Symbol* signature,
531 OverpassLookupMode overpass_mode,
532 StaticLookupMode static_mode,
533 PrivateLookupMode private_mode);
534
535 // true if method matches signature and conforms to skipping_X conditions.
536 static bool method_matches(Method* m, Symbol* signature, bool skipping_overpass, bool skipping_static, bool skipping_private);
537
538 // find a local method index in methods or default_methods (returns -1 if not found)
539 static int find_method_index(Array<Method*>* methods,
540 Symbol* name, Symbol* signature,
541 OverpassLookupMode overpass_mode,
542 StaticLookupMode static_mode,
543 PrivateLookupMode private_mode);
544
545 // lookup operation (returns NULL if not found)
546 Method* uncached_lookup_method(Symbol* name, Symbol* signature, OverpassLookupMode overpass_mode) const;
547
548 // lookup a method in all the interfaces that this class implements
549 // (returns NULL if not found)
550 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
551
552 // lookup a method in local defaults then in all interfaces
553 // (returns NULL if not found)
554 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
555
556 // Find method indices by name. If a method with the specified name is
557 // found the index to the first method is returned, and 'end' is filled in
558 // with the index of first non-name-matching method. If no method is found
559 // -1 is returned.
560 int find_method_by_name(Symbol* name, int* end);
561 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end);
562
563 // constant pool
564 ConstantPool* constants() const { return _constants; }
565 void set_constants(ConstantPool* c) { _constants = c; }
566
567 // protection domain
568 oop protection_domain() const;
569
570 // signers
571 objArrayOop signers() const;
572
573 // host class
574 Klass* host_klass() const {
575 Klass** hk = (Klass**)adr_host_klass();
576 if (hk == NULL) {
577 return NULL;
578 } else {
579 assert(*hk != NULL, "host klass should always be set if the address is not null");
580 return *hk;
581 }
582 }
583 void set_host_klass(Klass* host) {
584 assert(is_anonymous(), "not anonymous");
585 Klass** addr = (Klass**)adr_host_klass();
586 assert(addr != NULL, "no reversed space");
587 if (addr != NULL) {
588 *addr = host;
589 }
590 }
591 bool is_anonymous() const {
592 return (_misc_flags & _misc_is_anonymous) != 0;
593 }
594 void set_is_anonymous(bool value) {
595 if (value) {
596 _misc_flags |= _misc_is_anonymous;
597 } else {
598 _misc_flags &= ~_misc_is_anonymous;
599 }
600 }
601
602 // Oop that keeps the metadata for this class from being unloaded
603 // in places where the metadata is stored in other places, like nmethods
604 oop klass_holder() const {
605 return is_anonymous() ? java_mirror() : class_loader();
606 }
607
608 bool is_contended() const {
609 return (_misc_flags & _misc_is_contended) != 0;
610 }
611 void set_is_contended(bool value) {
612 if (value) {
613 _misc_flags |= _misc_is_contended;
614 } else {
615 _misc_flags &= ~_misc_is_contended;
616 }
617 }
618
619 // source file name
620 Symbol* source_file_name() const {
621 return (_source_file_name_index == 0) ?
622 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
623 }
624 u2 source_file_name_index() const {
625 return _source_file_name_index;
626 }
627 void set_source_file_name_index(u2 sourcefile_index) {
628 _source_file_name_index = sourcefile_index;
629 }
630
631 // minor and major version numbers of class file
632 u2 minor_version() const { return _minor_version; }
633 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
634 u2 major_version() const { return _major_version; }
635 void set_major_version(u2 major_version) { _major_version = major_version; }
636
637 // source debug extension
638 char* source_debug_extension() const { return _source_debug_extension; }
639 void set_source_debug_extension(char* array, int length);
640
641 // symbol unloading support (refcount already added)
642 Symbol* array_name() { return _array_name; }
643 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
644
645 // nonstatic oop-map blocks
646 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
647 return oop_map_count * OopMapBlock::size_in_words();
648 }
649 unsigned int nonstatic_oop_map_count() const {
650 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
651 }
652 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
653 void set_nonstatic_oop_map_size(int words) {
654 _nonstatic_oop_map_size = words;
655 }
656
657 // RedefineClasses() support for previous versions:
658 void add_previous_version(instanceKlassHandle ikh, int emcp_method_count);
659
660 InstanceKlass* previous_versions() const { return _previous_versions; }
661
662 InstanceKlass* get_klass_version(int version) {
663 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
664 if (ik->constants()->version() == version) {
665 return ik;
666 }
667 }
668 return NULL;
669 }
670
671 bool has_been_redefined() const {
672 return (_misc_flags & _misc_has_been_redefined) != 0;
673 }
674 void set_has_been_redefined() {
675 _misc_flags |= _misc_has_been_redefined;
676 }
677
678 bool is_scratch_class() const {
679 return (_misc_flags & _misc_is_scratch_class) != 0;
680 }
681
682 void set_is_scratch_class() {
683 _misc_flags |= _misc_is_scratch_class;
684 }
685
686 private:
687
688 void set_kind(unsigned kind) {
689 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
690 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
691 unsigned flags = _misc_flags & ~fmask;
692 _misc_flags = (flags | (kind << _misc_kind_field_pos));
693 }
694
695 bool is_kind(unsigned desired) const {
696 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
697 return kind == desired;
698 }
699
700 public:
701
702 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
703 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
704 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
705 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
706 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
707
708 void init_previous_versions() {
709 _previous_versions = NULL;
710 }
711
712 private:
713 static int _previous_version_count;
714 public:
715 static void purge_previous_versions(InstanceKlass* ik);
716 static bool has_previous_versions() { return _previous_version_count > 0; }
717
718 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
719 void set_cached_class_file(JvmtiCachedClassFileData *data) {
720 _cached_class_file = data;
721 }
722 JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; }
723 jint get_cached_class_file_len();
724 unsigned char * get_cached_class_file_bytes();
725
726 // JVMTI: Support for caching of field indices, types, and offsets
727 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
728 _jvmti_cached_class_field_map = descriptor;
729 }
730 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
731 return _jvmti_cached_class_field_map;
732 }
733
734 bool has_default_methods() const {
735 return (_misc_flags & _misc_has_default_methods) != 0;
736 }
737 void set_has_default_methods(bool b) {
738 if (b) {
739 _misc_flags |= _misc_has_default_methods;
740 } else {
741 _misc_flags &= ~_misc_has_default_methods;
742 }
743 }
744
745 bool declares_default_methods() const {
746 return (_misc_flags & _misc_declares_default_methods) != 0;
747 }
748 void set_declares_default_methods(bool b) {
749 if (b) {
750 _misc_flags |= _misc_declares_default_methods;
751 } else {
752 _misc_flags &= ~_misc_declares_default_methods;
753 }
754 }
755
756 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
757 inline u2 next_method_idnum();
758 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
759
760 // generics support
761 Symbol* generic_signature() const {
762 return (_generic_signature_index == 0) ?
763 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
764 }
765 u2 generic_signature_index() const {
766 return _generic_signature_index;
767 }
768 void set_generic_signature_index(u2 sig_index) {
769 _generic_signature_index = sig_index;
770 }
771
772 u2 enclosing_method_data(int offset);
773 u2 enclosing_method_class_index() {
774 return enclosing_method_data(enclosing_method_class_index_offset);
775 }
776 u2 enclosing_method_method_index() {
777 return enclosing_method_data(enclosing_method_method_index_offset);
778 }
779 void set_enclosing_method_indices(u2 class_index,
780 u2 method_index);
781
782 // jmethodID support
783 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
784 const methodHandle& method_h);
785 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
786 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
787 jmethodID* to_dealloc_id_p,
788 jmethodID** to_dealloc_jmeths_p);
789 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
790 size_t *length_p, jmethodID* id_p);
791 void ensure_space_for_methodids(int start_offset = 0);
792 jmethodID jmethod_id_or_null(Method* method);
793
794 // annotations support
795 Annotations* annotations() const { return _annotations; }
796 void set_annotations(Annotations* anno) { _annotations = anno; }
797
798 AnnotationArray* class_annotations() const {
799 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
800 }
801 Array<AnnotationArray*>* fields_annotations() const {
802 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
803 }
804 AnnotationArray* class_type_annotations() const {
805 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
806 }
807 Array<AnnotationArray*>* fields_type_annotations() const {
808 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
809 }
810 // allocation
811 instanceOop allocate_instance(TRAPS);
812
813 // additional member function to return a handle
814 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
815
816 objArrayOop allocate_objArray(int n, int length, TRAPS);
817 // Helper function
818 static instanceOop register_finalizer(instanceOop i, TRAPS);
819
820 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
821 // if not, throw either an Error or an Exception.
822 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
823
824 // initialization
825 void call_class_initializer(TRAPS);
826 void set_initialization_state_and_notify(ClassState state, TRAPS);
827
828 // OopMapCache support
829 OopMapCache* oop_map_cache() { return _oop_map_cache; }
830 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
831 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
832
833 // JNI identifier support (for static fields - for jni performance)
834 JNIid* jni_ids() { return _jni_ids; }
835 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
836 JNIid* jni_id_for(int offset);
837
838 // maintenance of deoptimization dependencies
839 int mark_dependent_nmethods(DepChange& changes);
840 void add_dependent_nmethod(nmethod* nm);
841 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
842
843 // On-stack replacement support
844 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
845 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
846 void add_osr_nmethod(nmethod* n);
847 void remove_osr_nmethod(nmethod* n);
848 int mark_osr_nmethods(const Method* m);
849 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
850
851 // Breakpoint support (see methods on Method* for details)
852 BreakpointInfo* breakpoints() const { return _breakpoints; };
853 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
854
855 // support for stub routines
856 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
857 TRACE_DEFINE_OFFSET;
858 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
859
860 // subclass/subinterface checks
861 bool implements_interface(Klass* k) const;
862 bool is_same_or_direct_interface(Klass* k) const;
863
864 #ifdef ASSERT
865 // check whether this class or one of its superclasses was redefined
866 bool has_redefined_this_or_super();
867 #endif
868
869 // Access to the implementor of an interface.
870 Klass* implementor() const
871 {
872 Klass** k = adr_implementor();
873 if (k == NULL) {
874 return NULL;
875 } else {
876 return *k;
877 }
878 }
879
880 void set_implementor(Klass* k) {
881 assert(is_interface(), "not interface");
882 Klass** addr = adr_implementor();
883 assert(addr != NULL, "null addr");
884 if (addr != NULL) {
885 *addr = k;
886 }
887 }
888
889 int nof_implementors() const {
890 Klass* k = implementor();
891 if (k == NULL) {
892 return 0;
893 } else if (k != this) {
894 return 1;
895 } else {
896 return 2;
897 }
898 }
899
900 void add_implementor(Klass* k); // k is a new class that implements this interface
901 void init_implementor(); // initialize
902
903 // link this class into the implementors list of every interface it implements
904 void process_interfaces(Thread *thread);
905
906 // virtual operations from Klass
907 bool is_leaf_class() const { return _subklass == NULL; }
908 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
909 bool compute_is_subtype_of(Klass* k);
910 bool can_be_primary_super_slow() const;
911 int oop_size(oop obj) const { return size_helper(); }
912 // slow because it's a virtual call and used for verifying the layout_helper.
913 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
914 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
915
916 // Iterators
917 void do_local_static_fields(FieldClosure* cl);
918 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
919 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
920
921 void methods_do(void f(Method* method));
922 void array_klasses_do(void f(Klass* k));
923 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
924 bool super_types_do(SuperTypeClosure* blk);
925
926 // Casting from Klass*
927 static InstanceKlass* cast(Klass* k) {
928 assert(k != NULL, "k should not be null");
929 assert(k->is_instance_klass(), "cast to InstanceKlass");
930 return static_cast<InstanceKlass*>(k);
931 }
932
933 InstanceKlass* java_super() const {
934 return (super() == NULL) ? NULL : cast(super());
935 }
936
937 // Sizing (in words)
938 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
939
940 static int size(int vtable_length, int itable_length,
941 int nonstatic_oop_map_size,
942 bool is_interface, bool is_anonymous) {
943 return align_object_size(header_size() +
944 align_object_offset(vtable_length) +
945 align_object_offset(itable_length) +
946 ((is_interface || is_anonymous) ?
947 align_object_offset(nonstatic_oop_map_size) :
948 nonstatic_oop_map_size) +
949 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
950 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
951 }
952 int size() const { return size(vtable_length(),
953 itable_length(),
954 nonstatic_oop_map_size(),
955 is_interface(),
956 is_anonymous());
957 }
958 #if INCLUDE_SERVICES
959 virtual void collect_statistics(KlassSizeStats *sz) const;
960 #endif
961
962 static int vtable_start_offset() { return header_size(); }
963 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
964
965 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); }
966 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
967 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
968
969 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
970
971 address static_field_addr(int offset);
972
973 OopMapBlock* start_of_nonstatic_oop_maps() const {
974 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
975 }
976
977 Klass** end_of_nonstatic_oop_maps() const {
978 return (Klass**)(start_of_nonstatic_oop_maps() +
979 nonstatic_oop_map_count());
980 }
981
982 Klass** adr_implementor() const {
983 if (is_interface()) {
984 return (Klass**)end_of_nonstatic_oop_maps();
985 } else {
986 return NULL;
987 }
988 };
989
990 Klass** adr_host_klass() const {
991 if (is_anonymous()) {
992 Klass** adr_impl = adr_implementor();
993 if (adr_impl != NULL) {
994 return adr_impl + 1;
995 } else {
996 return end_of_nonstatic_oop_maps();
997 }
998 } else {
999 return NULL;
1000 }
1001 }
1002
1003 // Use this to return the size of an instance in heap words:
1004 int size_helper() const {
1005 return layout_helper_to_size_helper(layout_helper());
1006 }
1007
1008 // This bit is initialized in classFileParser.cpp.
1009 // It is false under any of the following conditions:
1010 // - the class is abstract (including any interface)
1011 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1012 // - the class size is larger than FastAllocateSizeLimit
1013 // - the class is java/lang/Class, which cannot be allocated directly
1014 bool can_be_fastpath_allocated() const {
1015 return !layout_helper_needs_slow_path(layout_helper());
1016 }
1017
1018 // Java vtable/itable
1019 klassVtable* vtable() const; // return new klassVtable wrapper
1020 inline Method* method_at_vtable(int index);
1021 klassItable* itable() const; // return new klassItable wrapper
1022 Method* method_at_itable(Klass* holder, int index, TRAPS);
1023
1024 #if INCLUDE_JVMTI
1025 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1026 #endif // INCLUDE_JVMTI
1027
1028 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1029 void clean_implementors_list(BoolObjectClosure* is_alive);
1030 void clean_method_data(BoolObjectClosure* is_alive);
1031 void clean_dependent_nmethods();
1032
1033 // Explicit metaspace deallocation of fields
1034 // For RedefineClasses and class file parsing errors, we need to deallocate
1035 // instanceKlasses and the metadata they point to.
1036 void deallocate_contents(ClassLoaderData* loader_data);
1037 static void deallocate_methods(ClassLoaderData* loader_data,
1038 Array<Method*>* methods);
1039 void static deallocate_interfaces(ClassLoaderData* loader_data,
1040 Klass* super_klass,
1041 Array<Klass*>* local_interfaces,
1042 Array<Klass*>* transitive_interfaces);
1043
1044 // The constant pool is on stack if any of the methods are executing or
1045 // referenced by handles.
1046 bool on_stack() const { return _constants->on_stack(); }
1047
1048 // callbacks for actions during class unloading
1049 static void notify_unload_class(InstanceKlass* ik);
1050 static void release_C_heap_structures(InstanceKlass* ik);
1051
1052 // Naming
1053 const char* signature_name() const;
1054
1055 // GC specific object visitors
1056 //
1057 // Mark Sweep
1058 int oop_ms_adjust_pointers(oop obj);
1059 #if INCLUDE_ALL_GCS
1060 // Parallel Scavenge
1061 void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
1062 // Parallel Compact
1063 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
1064 void oop_pc_update_pointers(oop obj);
1065 #endif
1066
1067 // Oop fields (and metadata) iterators
1068 // [nv = true] Use non-virtual calls to do_oop_nv.
1069 // [nv = false] Use virtual calls to do_oop.
1070 //
1071 // The InstanceKlass iterators also visits the Object's klass.
1072
1073 // Forward iteration
1074 public:
1075 // Iterate over all oop fields in the oop maps.
1076 template <bool nv, class OopClosureType>
1077 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1078
1079 protected:
1080 // Iterate over all oop fields and metadata.
1081 template <bool nv, class OopClosureType>
1082 inline int oop_oop_iterate(oop obj, OopClosureType* closure);
1083
1084 private:
1085 // Iterate over all oop fields in the oop maps.
1086 // Specialized for [T = oop] or [T = narrowOop].
1087 template <bool nv, typename T, class OopClosureType>
1088 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure);
1089
1090 // Iterate over all oop fields in one oop map.
1091 template <bool nv, typename T, class OopClosureType>
1092 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1093
1094
1095 // Reverse iteration
1096 #if INCLUDE_ALL_GCS
1097 public:
1098 // Iterate over all oop fields in the oop maps.
1099 template <bool nv, class OopClosureType>
1100 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1101
1102 protected:
1103 // Iterate over all oop fields and metadata.
1104 template <bool nv, class OopClosureType>
1105 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1106
1107 private:
1108 // Iterate over all oop fields in the oop maps.
1109 // Specialized for [T = oop] or [T = narrowOop].
1110 template <bool nv, typename T, class OopClosureType>
1111 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure);
1112
1113 // Iterate over all oop fields in one oop map.
1114 template <bool nv, typename T, class OopClosureType>
1115 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1116 #endif
1117
1118
1119 // Bounded range iteration
1120 public:
1121 // Iterate over all oop fields in the oop maps.
1122 template <bool nv, class OopClosureType>
1123 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1124
1125 protected:
1126 // Iterate over all oop fields and metadata.
1127 template <bool nv, class OopClosureType>
1128 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1129
1130 private:
1131 // Iterate over all oop fields in the oop maps.
1132 // Specialized for [T = oop] or [T = narrowOop].
1133 template <bool nv, typename T, class OopClosureType>
1134 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1135
1136 // Iterate over all oop fields in one oop map.
1137 template <bool nv, typename T, class OopClosureType>
1138 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1139
1140
1141 public:
1142
1143 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
1144 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
1145
1146 #if INCLUDE_ALL_GCS
1147 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
1148 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
1149 #endif // INCLUDE_ALL_GCS
1150
1151 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1152
1153 public:
1154 void set_in_error_state() {
1155 assert(DumpSharedSpaces, "only call this when dumping archive");
1156 _init_state = initialization_error;
1157 }
1158 bool check_sharing_error_state();
1159
1160 private:
1161 // initialization state
1162 #ifdef ASSERT
1163 void set_init_state(ClassState state);
1164 #else
1165 void set_init_state(ClassState state) { _init_state = (u1)state; }
1166 #endif
1167 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1168 void set_init_thread(Thread *thread) { _init_thread = thread; }
1169
1170 // The RedefineClasses() API can cause new method idnums to be needed
1171 // which will cause the caches to grow. Safety requires different
1172 // cache management logic if the caches can grow instead of just
1173 // going from NULL to non-NULL.
1174 bool idnum_can_increment() const { return has_been_redefined(); }
1175 jmethodID* methods_jmethod_ids_acquire() const
1176 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
1177 void release_set_methods_jmethod_ids(jmethodID* jmeths)
1178 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
1179
1180 // Lock during initialization
1181 public:
1182 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1183 // Must be one per class and it has to be a VM internal object so java code
1184 // cannot lock it (like the mirror).
1185 // It has to be an object not a Mutex because it's held through java calls.
1186 oop init_lock() const;
1187 private:
1188 void fence_and_clear_init_lock();
1189
1190 // Static methods that are used to implement member methods where an exposed this pointer
1191 // is needed due to possible GCs
1192 static bool link_class_impl (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS);
1193 static bool verify_code (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS);
1194 static void initialize_impl (instanceKlassHandle this_k, TRAPS);
1195 static void initialize_super_interfaces (instanceKlassHandle this_k, TRAPS);
1196 static void eager_initialize_impl (instanceKlassHandle this_k);
1197 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_k, ClassState state, TRAPS);
1198 static void call_class_initializer_impl (instanceKlassHandle this_k, TRAPS);
1199 static Klass* array_klass_impl (instanceKlassHandle this_k, bool or_null, int n, TRAPS);
1200 static void do_local_static_fields_impl (instanceKlassHandle this_k, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS);
1201 /* jni_id_for_impl for jfieldID only */
1202 static JNIid* jni_id_for_impl (instanceKlassHandle this_k, int offset);
1203
1204 // Returns the array class for the n'th dimension
1205 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1206
1207 // Returns the array class with this class as element type
1208 Klass* array_klass_impl(bool or_null, TRAPS);
1209
1210 // find a local method (returns NULL if not found)
1211 Method* find_method_impl(Symbol* name, Symbol* signature,
1212 OverpassLookupMode overpass_mode,
1213 StaticLookupMode static_mode,
1214 PrivateLookupMode private_mode) const;
1215 static Method* find_method_impl(Array<Method*>* methods,
1216 Symbol* name, Symbol* signature,
1217 OverpassLookupMode overpass_mode,
1218 StaticLookupMode static_mode,
1219 PrivateLookupMode private_mode);
1220
1221 // Free CHeap allocated fields.
1222 void release_C_heap_structures();
1223
1224 // RedefineClasses support
1225 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1226 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1227 public:
1228 // CDS support - remove and restore oops from metadata. Oops are not shared.
1229 virtual void remove_unshareable_info();
1230 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1231
1232 // jvm support
1233 jint compute_modifier_flags(TRAPS) const;
1234
1235 // JSR-292 support
1236 MemberNameTable* member_names() { return _member_names; }
1237 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; }
1238 bool add_member_name(Handle member_name);
1239
1240 public:
1241 // JVMTI support
1242 jint jvmti_class_status() const;
1243
1244 public:
1245 // Printing
1246 #ifndef PRODUCT
1247 void print_on(outputStream* st) const;
1248 #endif
1249 void print_value_on(outputStream* st) const;
1250
1251 void oop_print_value_on(oop obj, outputStream* st);
1252
1253 #ifndef PRODUCT
1254 void oop_print_on (oop obj, outputStream* st);
1255
1256 void print_dependent_nmethods(bool verbose = false);
1257 bool is_dependent_nmethod(nmethod* nm);
1258 #endif
1259
1260 const char* internal_name() const;
1261
1262 // Verification
1263 void verify_on(outputStream* st);
1264
1265 void oop_verify_on(oop obj, outputStream* st);
1266
1267 // Logging
1268 void print_loading_log(LogLevel::type type, ClassLoaderData* loader_data, ClassFileStream* cfs) const;
1269 };
1270
1271 inline Method* InstanceKlass::method_at_vtable(int index) {
1272 #ifndef PRODUCT
1273 assert(index >= 0, "valid vtable index");
1274 if (DebugVtables) {
1275 verify_vtable_index(index);
1276 }
1277 #endif
1278 vtableEntry* ve = (vtableEntry*)start_of_vtable();
1279 return ve[index].method();
1280 }
1281
1282 // for adding methods
1283 // UNSET_IDNUM return means no more ids available
1284 inline u2 InstanceKlass::next_method_idnum() {
1285 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1286 return ConstMethod::UNSET_IDNUM; // no more ids available
1287 } else {
1288 return _idnum_allocated_count++;
1289 }
1290 }
1291
1292
1293 /* JNIid class for jfieldIDs only */
1294 class JNIid: public CHeapObj<mtClass> {
1295 friend class VMStructs;
1296 private:
1297 Klass* _holder;
1298 JNIid* _next;
1299 int _offset;
1300 #ifdef ASSERT
1301 bool _is_static_field_id;
1302 #endif
1303
1304 public:
1305 // Accessors
1306 Klass* holder() const { return _holder; }
1307 int offset() const { return _offset; }
1308 JNIid* next() { return _next; }
1309 // Constructor
1310 JNIid(Klass* holder, int offset, JNIid* next);
1311 // Identifier lookup
1312 JNIid* find(int offset);
1313
1314 bool find_local_field(fieldDescriptor* fd) {
1315 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1316 }
1317
1318 static void deallocate(JNIid* id);
1319 // Debugging
1320 #ifdef ASSERT
1321 bool is_static_field_id() const { return _is_static_field_id; }
1322 void set_is_static_field_id() { _is_static_field_id = true; }
1323 #endif
1324 void verify(Klass* holder);
1325 };
1326
1327
1328 //
1329 // nmethodBucket is used to record dependent nmethods for
1330 // deoptimization. nmethod dependencies are actually <klass, method>
1331 // pairs but we really only care about the klass part for purposes of
1332 // finding nmethods which might need to be deoptimized. Instead of
1333 // recording the method, a count of how many times a particular nmethod
1334 // was recorded is kept. This ensures that any recording errors are
1335 // noticed since an nmethod should be removed as many times are it's
1336 // added.
1337 //
1338 class nmethodBucket: public CHeapObj<mtClass> {
1339 friend class VMStructs;
1340 private:
1341 nmethod* _nmethod;
1342 int _count;
1343 nmethodBucket* _next;
1344
1345 public:
1346 nmethodBucket(nmethod* nmethod, nmethodBucket* next) {
1347 _nmethod = nmethod;
1348 _next = next;
1349 _count = 1;
1350 }
1351 int count() { return _count; }
1352 int increment() { _count += 1; return _count; }
1353 int decrement();
1354 nmethodBucket* next() { return _next; }
1355 void set_next(nmethodBucket* b) { _next = b; }
1356 nmethod* get_nmethod() { return _nmethod; }
1357
1358 static int mark_dependent_nmethods(nmethodBucket* deps, DepChange& changes);
1359 static nmethodBucket* add_dependent_nmethod(nmethodBucket* deps, nmethod* nm);
1360 static bool remove_dependent_nmethod(nmethodBucket** deps, nmethod* nm, bool delete_immediately);
1361 static bool remove_dependent_nmethod(nmethodBucket* deps, nmethod* nm);
1362 static nmethodBucket* clean_dependent_nmethods(nmethodBucket* deps);
1363 #ifndef PRODUCT
1364 static void print_dependent_nmethods(nmethodBucket* deps, bool verbose);
1365 static bool is_dependent_nmethod(nmethodBucket* deps, nmethod* nm);
1366 #endif //PRODUCT
1367 };
1368
1369 // An iterator that's used to access the inner classes indices in the
1370 // InstanceKlass::_inner_classes array.
1371 class InnerClassesIterator : public StackObj {
1372 private:
1373 Array<jushort>* _inner_classes;
1374 int _length;
1375 int _idx;
1376 public:
1377
1378 InnerClassesIterator(instanceKlassHandle k) {
1379 _inner_classes = k->inner_classes();
1380 if (k->inner_classes() != NULL) {
1381 _length = _inner_classes->length();
1382 // The inner class array's length should be the multiple of
1383 // inner_class_next_offset if it only contains the InnerClasses
1384 // attribute data, or it should be
1385 // n*inner_class_next_offset+enclosing_method_attribute_size
1386 // if it also contains the EnclosingMethod data.
1387 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1388 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1389 "just checking");
1390 // Remove the enclosing_method portion if exists.
1391 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1392 _length -= InstanceKlass::enclosing_method_attribute_size;
1393 }
1394 } else {
1395 _length = 0;
1396 }
1397 _idx = 0;
1398 }
1399
1400 int length() const {
1401 return _length;
1402 }
1403
1404 void next() {
1405 _idx += InstanceKlass::inner_class_next_offset;
1406 }
1407
1408 bool done() const {
1409 return (_idx >= _length);
1410 }
1411
1412 u2 inner_class_info_index() const {
1413 return _inner_classes->at(
1414 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1415 }
1416
1417 void set_inner_class_info_index(u2 index) {
1418 _inner_classes->at_put(
1419 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1420 }
1421
1422 u2 outer_class_info_index() const {
1423 return _inner_classes->at(
1424 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1425 }
1426
1427 void set_outer_class_info_index(u2 index) {
1428 _inner_classes->at_put(
1429 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1430 }
1431
1432 u2 inner_name_index() const {
1433 return _inner_classes->at(
1434 _idx + InstanceKlass::inner_class_inner_name_offset);
1435 }
1436
1437 void set_inner_name_index(u2 index) {
1438 _inner_classes->at_put(
1439 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1440 }
1441
1442 u2 inner_access_flags() const {
1443 return _inner_classes->at(
1444 _idx + InstanceKlass::inner_class_access_flags_offset);
1445 }
1446 };
1447
1448 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP