rev 58452 : imported patch pkg_name_from_class
1 /*
2 * Copyright (c) 1997, 2020, 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_OOPS_INSTANCEKLASS_HPP
26 #define SHARE_OOPS_INSTANCEKLASS_HPP
27
28 #include "classfile/classLoaderData.hpp"
29 #include "memory/referenceType.hpp"
30 #include "oops/annotations.hpp"
31 #include "oops/constMethod.hpp"
32 #include "oops/fieldInfo.hpp"
33 #include "oops/instanceOop.hpp"
34 #include "oops/klassVtable.hpp"
35 #include "runtime/handles.hpp"
36 #include "runtime/os.hpp"
37 #include "utilities/accessFlags.hpp"
38 #include "utilities/align.hpp"
39 #include "utilities/macros.hpp"
40 #if INCLUDE_JFR
41 #include "jfr/support/jfrKlassExtension.hpp"
42 #endif
43
44 class RecordComponent;
45
46 // An InstanceKlass is the VM level representation of a Java class.
47 // It contains all information needed for at class at execution runtime.
48
49 // InstanceKlass embedded field layout (after declared fields):
50 // [EMBEDDED Java vtable ] size in words = vtable_len
51 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
52 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
53 // indicating where oops are located in instances of this klass.
54 // [EMBEDDED implementor of the interface] only exist for interface
55 // [EMBEDDED unsafe_anonymous_host klass] only exist for an unsafe anonymous class (JSR 292 enabled)
56 // [EMBEDDED fingerprint ] only if should_store_fingerprint()==true
57
58
59 // forward declaration for class -- see below for definition
60 #if INCLUDE_JVMTI
61 class BreakpointInfo;
62 #endif
63 class ClassFileParser;
64 class ClassFileStream;
65 class KlassDepChange;
66 class DependencyContext;
67 class fieldDescriptor;
68 class jniIdMapBase;
69 class JNIid;
70 class JvmtiCachedClassFieldMap;
71 class nmethodBucket;
72 class OopMapCache;
73 class InterpreterOopMap;
74 class PackageEntry;
75 class ModuleEntry;
76
77 // This is used in iterators below.
78 class FieldClosure: public StackObj {
79 public:
80 virtual void do_field(fieldDescriptor* fd) = 0;
81 };
82
83 #ifndef PRODUCT
84 // Print fields.
85 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
86 class FieldPrinter: public FieldClosure {
87 oop _obj;
88 outputStream* _st;
89 public:
90 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
91 void do_field(fieldDescriptor* fd);
92 };
93 #endif // !PRODUCT
94
95 // Describes where oops are located in instances of this klass.
96 class OopMapBlock {
97 public:
98 // Byte offset of the first oop mapped by this block.
99 int offset() const { return _offset; }
100 void set_offset(int offset) { _offset = offset; }
101
102 // Number of oops in this block.
103 uint count() const { return _count; }
104 void set_count(uint count) { _count = count; }
105
106 void increment_count(int diff) { _count += diff; }
107
108 int offset_span() const { return _count * heapOopSize; }
109
110 int end_offset() const {
111 return offset() + offset_span();
112 }
113
114 bool is_contiguous(int another_offset) const {
115 return another_offset == end_offset();
116 }
117
118 // sizeof(OopMapBlock) in words.
119 static const int size_in_words() {
120 return align_up((int)sizeof(OopMapBlock), wordSize) >>
121 LogBytesPerWord;
122 }
123
124 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) {
125 return a->offset() - b->offset();
126 }
127
128 private:
129 int _offset;
130 uint _count;
131 };
132
133 struct JvmtiCachedClassFileData;
134
135 class InstanceKlass: public Klass {
136 friend class VMStructs;
137 friend class JVMCIVMStructs;
138 friend class ClassFileParser;
139 friend class CompileReplay;
140
141 public:
142 static const KlassID ID = InstanceKlassID;
143
144 protected:
145 InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id = ID);
146
147 public:
148 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
149
150 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
151 // of the class loading & initialization procedure, and the use of the states.
152 enum ClassState {
153 allocated, // allocated (but not yet linked)
154 loaded, // loaded and inserted in class hierarchy (but not linked yet)
155 linked, // successfully linked/verified (but not initialized yet)
156 being_initialized, // currently running class initializer
157 fully_initialized, // initialized (successfull final state)
158 initialization_error // error happened during initialization
159 };
160
161 private:
162 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
163
164 protected:
165 // If you add a new field that points to any metaspace object, you
166 // must add this field to InstanceKlass::metaspace_pointers_do().
167
168 // Annotations for this class
169 Annotations* _annotations;
170 // Package this class is defined in
171 PackageEntry* _package_entry;
172 // Array classes holding elements of this class.
173 Klass* volatile _array_klasses;
174 // Constant pool for this class.
175 ConstantPool* _constants;
176 // The InnerClasses attribute and EnclosingMethod attribute. The
177 // _inner_classes is an array of shorts. If the class has InnerClasses
178 // attribute, then the _inner_classes array begins with 4-tuples of shorts
179 // [inner_class_info_index, outer_class_info_index,
180 // inner_name_index, inner_class_access_flags] for the InnerClasses
181 // attribute. If the EnclosingMethod attribute exists, it occupies the
182 // last two shorts [class_index, method_index] of the array. If only
183 // the InnerClasses attribute exists, the _inner_classes array length is
184 // number_of_inner_classes * 4. If the class has both InnerClasses
185 // and EnclosingMethod attributes the _inner_classes array length is
186 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
187 Array<jushort>* _inner_classes;
188
189 // The NestMembers attribute. An array of shorts, where each is a
190 // class info index for the class that is a nest member. This data
191 // has not been validated.
192 Array<jushort>* _nest_members;
193
194 // The NestHost attribute. The class info index for the class
195 // that is the nest-host of this class. This data has not been validated.
196 jushort _nest_host_index;
197
198 // Resolved nest-host klass: either true nest-host or self if we are not nested.
199 // By always being set it makes nest-member access checks simpler.
200 InstanceKlass* _nest_host;
201
202 // The contents of the Record attribute.
203 Array<RecordComponent*>* _record_components;
204
205 // the source debug extension for this klass, NULL if not specified.
206 // Specified as UTF-8 string without terminating zero byte in the classfile,
207 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
208 const char* _source_debug_extension;
209 // Array name derived from this class which needs unreferencing
210 // if this class is unloaded.
211 Symbol* _array_name;
212
213 // Number of heapOopSize words used by non-static fields in this klass
214 // (including inherited fields but after header_size()).
215 int _nonstatic_field_size;
216 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
217 // Constant pool index to the utf8 entry of the Generic signature,
218 // or 0 if none.
219 u2 _generic_signature_index;
220 // Constant pool index to the utf8 entry for the name of source file
221 // containing this klass, 0 if not specified.
222 u2 _source_file_name_index;
223 u2 _static_oop_field_count;// number of static oop fields in this klass
224 u2 _java_fields_count; // The number of declared Java fields
225 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
226
227 int _itable_len; // length of Java itable (in words)
228 // _is_marked_dependent can be set concurrently, thus cannot be part of the
229 // _misc_flags.
230 bool _is_marked_dependent; // used for marking during flushing and deoptimization
231
232 // The low two bits of _misc_flags contains the kind field.
233 // This can be used to quickly discriminate among the four kinds of
234 // InstanceKlass.
235
236 static const unsigned _misc_kind_field_size = 2;
237 static const unsigned _misc_kind_field_pos = 0;
238 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
239
240 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
241 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
242 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
243 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
244
245 // Start after _misc_kind field.
246 enum {
247 _misc_rewritten = 1 << 2, // methods rewritten.
248 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops
249 _misc_should_verify_class = 1 << 4, // allow caching of preverification
250 _misc_is_unsafe_anonymous = 1 << 5, // has embedded _unsafe_anonymous_host field
251 _misc_is_contended = 1 << 6, // marked with contended annotation
252 _misc_has_nonstatic_concrete_methods = 1 << 7, // class/superclass/implemented interfaces has non-static, concrete methods
253 _misc_declares_nonstatic_concrete_methods = 1 << 8, // directly declares non-static, concrete methods
254 _misc_has_been_redefined = 1 << 9, // class has been redefined
255 _misc_has_passed_fingerprint_check = 1 << 10, // when this class was loaded, the fingerprint computed from its
256 // code source was found to be matching the value recorded by AOT.
257 _misc_is_scratch_class = 1 << 11, // class is the redefined scratch class
258 _misc_is_shared_boot_class = 1 << 12, // defining class loader is boot class loader
259 _misc_is_shared_platform_class = 1 << 13, // defining class loader is platform class loader
260 _misc_is_shared_app_class = 1 << 14, // defining class loader is app class loader
261 _misc_has_resolved_methods = 1 << 15, // resolved methods table entries added for this class
262 _misc_is_being_redefined = 1 << 16, // used for locking redefinition
263 _misc_has_contended_annotations = 1 << 17 // has @Contended annotation
264 };
265 u2 shared_loader_type_bits() const {
266 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
267 }
268 u4 _misc_flags;
269 u2 _minor_version; // minor version number of class file
270 u2 _major_version; // major version number of class file
271 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization)
272 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
273 JNIid* _jni_ids; // First JNI identifier for static fields in this class
274 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
275 nmethodBucket* volatile _dep_context; // packed DependencyContext structure
276 uint64_t volatile _dep_context_last_cleaned;
277 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
278 #if INCLUDE_JVMTI
279 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
280 // Linked instanceKlasses of previous versions
281 InstanceKlass* _previous_versions;
282 // JVMTI fields can be moved to their own structure - see 6315920
283 // JVMTI: cached class file, before retransformable agent modified it in CFLH
284 JvmtiCachedClassFileData* _cached_class_file;
285 #endif
286
287 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
288
289 // Class states are defined as ClassState (see above).
290 // Place the _init_state here to utilize the unused 2-byte after
291 // _idnum_allocated_count.
292 u1 _init_state; // state of class
293 u1 _reference_type; // reference type
294
295 u2 _this_class_index; // constant pool entry
296 #if INCLUDE_JVMTI
297 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
298 #endif
299
300 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
301
302 // Method array.
303 Array<Method*>* _methods;
304 // Default Method Array, concrete methods inherited from interfaces
305 Array<Method*>* _default_methods;
306 // Interfaces (InstanceKlass*s) this class declares locally to implement.
307 Array<InstanceKlass*>* _local_interfaces;
308 // Interfaces (InstanceKlass*s) this class implements transitively.
309 Array<InstanceKlass*>* _transitive_interfaces;
310 // Int array containing the original order of method in the class file (for JVMTI).
311 Array<int>* _method_ordering;
312 // Int array containing the vtable_indices for default_methods
313 // offset matches _default_methods offset
314 Array<int>* _default_vtable_indices;
315
316 // Instance and static variable information, starts with 6-tuples of shorts
317 // [access, name index, sig index, initval index, low_offset, high_offset]
318 // for all fields, followed by the generic signature data at the end of
319 // the array. Only fields with generic signature attributes have the generic
320 // signature data set in the array. The fields array looks like following:
321 //
322 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
323 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
324 // ...
325 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
326 // [generic signature index]
327 // [generic signature index]
328 // ...
329 Array<u2>* _fields;
330
331 // embedded Java vtable follows here
332 // embedded Java itables follows here
333 // embedded static fields follows here
334 // embedded nonstatic oop-map blocks follows here
335 // embedded implementor of this interface follows here
336 // The embedded implementor only exists if the current klass is an
337 // iterface. The possible values of the implementor fall into following
338 // three cases:
339 // NULL: no implementor.
340 // A Klass* that's not itself: one implementor.
341 // Itself: more than one implementors.
342 // embedded unsafe_anonymous_host klass follows here
343 // The embedded host klass only exists in an unsafe anonymous class for
344 // dynamic language support (JSR 292 enabled). The host class grants
345 // its access privileges to this class also. The host class is either
346 // named, or a previously loaded unsafe anonymous class. A non-anonymous class
347 // or an anonymous class loaded through normal classloading does not
348 // have this embedded field.
349 //
350
351 friend class SystemDictionary;
352
353 static bool _disable_method_binary_search;
354
355 public:
356 // The three BUILTIN class loader types
357 bool is_shared_boot_class() const {
358 return (_misc_flags & _misc_is_shared_boot_class) != 0;
359 }
360 bool is_shared_platform_class() const {
361 return (_misc_flags & _misc_is_shared_platform_class) != 0;
362 }
363 bool is_shared_app_class() const {
364 return (_misc_flags & _misc_is_shared_app_class) != 0;
365 }
366 // The UNREGISTERED class loader type
367 bool is_shared_unregistered_class() const {
368 return (_misc_flags & shared_loader_type_bits()) == 0;
369 }
370
371 void clear_shared_class_loader_type() {
372 _misc_flags &= ~shared_loader_type_bits();
373 }
374
375 void set_shared_class_loader_type(s2 loader_type);
376
377 bool has_nonstatic_fields() const {
378 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
379 }
380 void set_has_nonstatic_fields(bool b) {
381 if (b) {
382 _misc_flags |= _misc_has_nonstatic_fields;
383 } else {
384 _misc_flags &= ~_misc_has_nonstatic_fields;
385 }
386 }
387
388 // field sizes
389 int nonstatic_field_size() const { return _nonstatic_field_size; }
390 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
391
392 int static_field_size() const { return _static_field_size; }
393 void set_static_field_size(int size) { _static_field_size = size; }
394
395 int static_oop_field_count() const { return (int)_static_oop_field_count; }
396 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
397
398 // Java itable
399 int itable_length() const { return _itable_len; }
400 void set_itable_length(int len) { _itable_len = len; }
401
402 // array klasses
403 Klass* array_klasses() const { return _array_klasses; }
404 inline Klass* array_klasses_acquire() const; // load with acquire semantics
405 void set_array_klasses(Klass* k) { _array_klasses = k; }
406 inline void release_set_array_klasses(Klass* k); // store with release semantics
407
408 // methods
409 Array<Method*>* methods() const { return _methods; }
410 void set_methods(Array<Method*>* a) { _methods = a; }
411 Method* method_with_idnum(int idnum);
412 Method* method_with_orig_idnum(int idnum);
413 Method* method_with_orig_idnum(int idnum, int version);
414
415 // method ordering
416 Array<int>* method_ordering() const { return _method_ordering; }
417 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
418 void copy_method_ordering(const intArray* m, TRAPS);
419
420 // default_methods
421 Array<Method*>* default_methods() const { return _default_methods; }
422 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
423
424 // default method vtable_indices
425 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
426 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
427 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
428
429 // interfaces
430 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; }
431 void set_local_interfaces(Array<InstanceKlass*>* a) {
432 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
433 _local_interfaces = a; }
434
435 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; }
436 void set_transitive_interfaces(Array<InstanceKlass*>* a) {
437 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
438 _transitive_interfaces = a;
439 }
440
441 private:
442 friend class fieldDescriptor;
443 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
444
445 public:
446 int field_offset (int index) const { return field(index)->offset(); }
447 int field_access_flags(int index) const { return field(index)->access_flags(); }
448 Symbol* field_name (int index) const { return field(index)->name(constants()); }
449 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
450
451 // Number of Java declared fields
452 int java_fields_count() const { return (int)_java_fields_count; }
453
454 Array<u2>* fields() const { return _fields; }
455 void set_fields(Array<u2>* f, u2 java_fields_count) {
456 guarantee(_fields == NULL || f == NULL, "Just checking");
457 _fields = f;
458 _java_fields_count = java_fields_count;
459 }
460
461 // inner classes
462 Array<u2>* inner_classes() const { return _inner_classes; }
463 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
464
465 // nest members
466 Array<u2>* nest_members() const { return _nest_members; }
467 void set_nest_members(Array<u2>* m) { _nest_members = m; }
468
469 // nest-host index
470 jushort nest_host_index() const { return _nest_host_index; }
471 void set_nest_host_index(u2 i) { _nest_host_index = i; }
472
473 // record components
474 Array<RecordComponent*>* record_components() const { return _record_components; }
475 void set_record_components(Array<RecordComponent*>* record_components) {
476 _record_components = record_components;
477 }
478 bool is_record() const { return _record_components != NULL; }
479
480 private:
481 // Called to verify that k is a member of this nest - does not look at k's nest-host
482 bool has_nest_member(InstanceKlass* k, TRAPS) const;
483
484 public:
485 // Returns nest-host class, resolving and validating it if needed
486 // Returns NULL if an exception occurs during loading, or validation fails
487 InstanceKlass* nest_host(Symbol* validationException, TRAPS);
488 // Check if this klass is a nestmate of k - resolves this nest-host and k's
489 bool has_nestmate_access_to(InstanceKlass* k, TRAPS);
490
491 enum InnerClassAttributeOffset {
492 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
493 inner_class_inner_class_info_offset = 0,
494 inner_class_outer_class_info_offset = 1,
495 inner_class_inner_name_offset = 2,
496 inner_class_access_flags_offset = 3,
497 inner_class_next_offset = 4
498 };
499
500 enum EnclosingMethodAttributeOffset {
501 enclosing_method_class_index_offset = 0,
502 enclosing_method_method_index_offset = 1,
503 enclosing_method_attribute_size = 2
504 };
505
506 // method override check
507 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
508
509 // package
510 PackageEntry* package() const { return _package_entry; }
511 ModuleEntry* module() const;
512 bool in_unnamed_package() const { return (_package_entry == NULL); }
513 void set_package(PackageEntry* p) { _package_entry = p; }
514 void set_package(ClassLoaderData* loader_data, TRAPS);
515 bool is_same_class_package(const Klass* class2) const;
516 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const;
517
518 // find an enclosing class
519 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
520
521 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
522 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
523
524 private:
525 // Check prohibited package ("java/" only loadable by boot or platform loaders)
526 static void check_prohibited_package(Symbol* class_name,
527 ClassLoaderData* loader_data,
528 TRAPS);
529 public:
530 // initialization state
531 bool is_loaded() const { return _init_state >= loaded; }
532 bool is_linked() const { return _init_state >= linked; }
533 bool is_initialized() const { return _init_state == fully_initialized; }
534 bool is_not_initialized() const { return _init_state < being_initialized; }
535 bool is_being_initialized() const { return _init_state == being_initialized; }
536 bool is_in_error_state() const { return _init_state == initialization_error; }
537 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
538 ClassState init_state() { return (ClassState)_init_state; }
539 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
540
541 // defineClass specified verification
542 bool should_verify_class() const {
543 return (_misc_flags & _misc_should_verify_class) != 0;
544 }
545 void set_should_verify_class(bool value) {
546 if (value) {
547 _misc_flags |= _misc_should_verify_class;
548 } else {
549 _misc_flags &= ~_misc_should_verify_class;
550 }
551 }
552
553 // marking
554 bool is_marked_dependent() const { return _is_marked_dependent; }
555 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
556
557 // initialization (virtuals from Klass)
558 bool should_be_initialized() const; // means that initialize should be called
559 void initialize(TRAPS);
560 void link_class(TRAPS);
561 bool link_class_or_fail(TRAPS); // returns false on failure
562 void rewrite_class(TRAPS);
563 void link_methods(TRAPS);
564 Method* class_initializer() const;
565
566 // set the class to initialized if no static initializer is present
567 void eager_initialize(Thread *thread);
568
569 // reference type
570 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
571 void set_reference_type(ReferenceType t) {
572 assert(t == (u1)t, "overflow");
573 _reference_type = (u1)t;
574 }
575
576 // this class cp index
577 u2 this_class_index() const { return _this_class_index; }
578 void set_this_class_index(u2 index) { _this_class_index = index; }
579
580 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
581
582 // find local field, returns true if found
583 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
584 // find field in direct superinterfaces, returns the interface in which the field is defined
585 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
586 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
587 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
588 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
589 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
590
591 // find a non-static or static field given its offset within the class.
592 bool contains_field_offset(int offset);
593
594 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
595 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
596
597 private:
598 inline static int quick_search(const Array<Method*>* methods, const Symbol* name);
599
600 public:
601 static void disable_method_binary_search() {
602 _disable_method_binary_search = true;
603 }
604
605 // find a local method (returns NULL if not found)
606 Method* find_method(const Symbol* name, const Symbol* signature) const;
607 static Method* find_method(const Array<Method*>* methods,
608 const Symbol* name,
609 const Symbol* signature);
610
611 // find a local method, but skip static methods
612 Method* find_instance_method(const Symbol* name, const Symbol* signature,
613 PrivateLookupMode private_mode = find_private) const;
614 static Method* find_instance_method(const Array<Method*>* methods,
615 const Symbol* name,
616 const Symbol* signature,
617 PrivateLookupMode private_mode = find_private);
618
619 // find a local method (returns NULL if not found)
620 Method* find_local_method(const Symbol* name,
621 const Symbol* signature,
622 OverpassLookupMode overpass_mode,
623 StaticLookupMode static_mode,
624 PrivateLookupMode private_mode) const;
625
626 // find a local method from given methods array (returns NULL if not found)
627 static Method* find_local_method(const Array<Method*>* methods,
628 const Symbol* name,
629 const Symbol* signature,
630 OverpassLookupMode overpass_mode,
631 StaticLookupMode static_mode,
632 PrivateLookupMode private_mode);
633
634 // find a local method index in methods or default_methods (returns -1 if not found)
635 static int find_method_index(const Array<Method*>* methods,
636 const Symbol* name,
637 const Symbol* signature,
638 OverpassLookupMode overpass_mode,
639 StaticLookupMode static_mode,
640 PrivateLookupMode private_mode);
641
642 // lookup operation (returns NULL if not found)
643 Method* uncached_lookup_method(const Symbol* name,
644 const Symbol* signature,
645 OverpassLookupMode overpass_mode,
646 PrivateLookupMode private_mode = find_private) const;
647
648 // lookup a method in all the interfaces that this class implements
649 // (returns NULL if not found)
650 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
651
652 // lookup a method in local defaults then in all interfaces
653 // (returns NULL if not found)
654 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
655
656 // Find method indices by name. If a method with the specified name is
657 // found the index to the first method is returned, and 'end' is filled in
658 // with the index of first non-name-matching method. If no method is found
659 // -1 is returned.
660 int find_method_by_name(const Symbol* name, int* end) const;
661 static int find_method_by_name(const Array<Method*>* methods,
662 const Symbol* name, int* end);
663
664 // constant pool
665 ConstantPool* constants() const { return _constants; }
666 void set_constants(ConstantPool* c) { _constants = c; }
667
668 // protection domain
669 oop protection_domain() const;
670
671 // signers
672 objArrayOop signers() const;
673
674 // host class
675 InstanceKlass* unsafe_anonymous_host() const {
676 InstanceKlass** hk = adr_unsafe_anonymous_host();
677 if (hk == NULL) {
678 assert(!is_unsafe_anonymous(), "Unsafe anonymous classes have host klasses");
679 return NULL;
680 } else {
681 assert(*hk != NULL, "host klass should always be set if the address is not null");
682 assert(is_unsafe_anonymous(), "Only unsafe anonymous classes have host klasses");
683 return *hk;
684 }
685 }
686 void set_unsafe_anonymous_host(const InstanceKlass* host) {
687 assert(is_unsafe_anonymous(), "not unsafe anonymous");
688 const InstanceKlass** addr = (const InstanceKlass **)adr_unsafe_anonymous_host();
689 assert(addr != NULL, "no reversed space");
690 if (addr != NULL) {
691 *addr = host;
692 }
693 }
694 bool is_unsafe_anonymous() const {
695 return (_misc_flags & _misc_is_unsafe_anonymous) != 0;
696 }
697 void set_is_unsafe_anonymous(bool value) {
698 if (value) {
699 _misc_flags |= _misc_is_unsafe_anonymous;
700 } else {
701 _misc_flags &= ~_misc_is_unsafe_anonymous;
702 }
703 }
704
705 bool is_contended() const {
706 return (_misc_flags & _misc_is_contended) != 0;
707 }
708 void set_is_contended(bool value) {
709 if (value) {
710 _misc_flags |= _misc_is_contended;
711 } else {
712 _misc_flags &= ~_misc_is_contended;
713 }
714 }
715
716 // source file name
717 Symbol* source_file_name() const {
718 return (_source_file_name_index == 0) ?
719 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
720 }
721 u2 source_file_name_index() const {
722 return _source_file_name_index;
723 }
724 void set_source_file_name_index(u2 sourcefile_index) {
725 _source_file_name_index = sourcefile_index;
726 }
727
728 // minor and major version numbers of class file
729 u2 minor_version() const { return _minor_version; }
730 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
731 u2 major_version() const { return _major_version; }
732 void set_major_version(u2 major_version) { _major_version = major_version; }
733
734 // source debug extension
735 const char* source_debug_extension() const { return _source_debug_extension; }
736 void set_source_debug_extension(const char* array, int length);
737
738 // symbol unloading support (refcount already added)
739 Symbol* array_name() { return _array_name; }
740 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
741
742 // nonstatic oop-map blocks
743 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
744 return oop_map_count * OopMapBlock::size_in_words();
745 }
746 unsigned int nonstatic_oop_map_count() const {
747 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
748 }
749 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
750 void set_nonstatic_oop_map_size(int words) {
751 _nonstatic_oop_map_size = words;
752 }
753
754 bool has_contended_annotations() const {
755 return ((_misc_flags & _misc_has_contended_annotations) != 0);
756 }
757 void set_has_contended_annotations(bool value) {
758 if (value) {
759 _misc_flags |= _misc_has_contended_annotations;
760 } else {
761 _misc_flags &= ~_misc_has_contended_annotations;
762 }
763 }
764
765 #if INCLUDE_JVMTI
766 // Redefinition locking. Class can only be redefined by one thread at a time.
767 bool is_being_redefined() const {
768 return ((_misc_flags & _misc_is_being_redefined) != 0);
769 }
770 void set_is_being_redefined(bool value) {
771 if (value) {
772 _misc_flags |= _misc_is_being_redefined;
773 } else {
774 _misc_flags &= ~_misc_is_being_redefined;
775 }
776 }
777
778 // RedefineClasses() support for previous versions:
779 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
780 void purge_previous_version_list();
781
782 InstanceKlass* previous_versions() const { return _previous_versions; }
783 #else
784 InstanceKlass* previous_versions() const { return NULL; }
785 #endif
786
787 InstanceKlass* get_klass_version(int version) {
788 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
789 if (ik->constants()->version() == version) {
790 return ik;
791 }
792 }
793 return NULL;
794 }
795
796 bool has_been_redefined() const {
797 return (_misc_flags & _misc_has_been_redefined) != 0;
798 }
799 void set_has_been_redefined() {
800 _misc_flags |= _misc_has_been_redefined;
801 }
802
803 bool has_passed_fingerprint_check() const {
804 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0;
805 }
806 void set_has_passed_fingerprint_check(bool b) {
807 if (b) {
808 _misc_flags |= _misc_has_passed_fingerprint_check;
809 } else {
810 _misc_flags &= ~_misc_has_passed_fingerprint_check;
811 }
812 }
813 bool supers_have_passed_fingerprint_checks();
814
815 static bool should_store_fingerprint(bool is_unsafe_anonymous);
816 bool should_store_fingerprint() const { return should_store_fingerprint(is_unsafe_anonymous()); }
817 bool has_stored_fingerprint() const;
818 uint64_t get_stored_fingerprint() const;
819 void store_fingerprint(uint64_t fingerprint);
820
821 bool is_scratch_class() const {
822 return (_misc_flags & _misc_is_scratch_class) != 0;
823 }
824
825 void set_is_scratch_class() {
826 _misc_flags |= _misc_is_scratch_class;
827 }
828
829 bool has_resolved_methods() const {
830 return (_misc_flags & _misc_has_resolved_methods) != 0;
831 }
832
833 void set_has_resolved_methods() {
834 _misc_flags |= _misc_has_resolved_methods;
835 }
836 private:
837
838 void set_kind(unsigned kind) {
839 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
840 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
841 unsigned flags = _misc_flags & ~fmask;
842 _misc_flags = (flags | (kind << _misc_kind_field_pos));
843 }
844
845 bool is_kind(unsigned desired) const {
846 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
847 return kind == desired;
848 }
849
850 public:
851
852 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
853 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
854 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
855 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
856 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
857
858 #if INCLUDE_JVMTI
859
860 void init_previous_versions() {
861 _previous_versions = NULL;
862 }
863
864 private:
865 static bool _has_previous_versions;
866 public:
867 static void purge_previous_versions(InstanceKlass* ik) {
868 if (ik->has_been_redefined()) {
869 ik->purge_previous_version_list();
870 }
871 }
872
873 static bool has_previous_versions_and_reset();
874 static bool has_previous_versions() { return _has_previous_versions; }
875
876 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
877 void set_cached_class_file(JvmtiCachedClassFileData *data) {
878 _cached_class_file = data;
879 }
880 JvmtiCachedClassFileData * get_cached_class_file();
881 jint get_cached_class_file_len();
882 unsigned char * get_cached_class_file_bytes();
883
884 // JVMTI: Support for caching of field indices, types, and offsets
885 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
886 _jvmti_cached_class_field_map = descriptor;
887 }
888 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
889 return _jvmti_cached_class_field_map;
890 }
891 #else // INCLUDE_JVMTI
892
893 static void purge_previous_versions(InstanceKlass* ik) { return; };
894 static bool has_previous_versions_and_reset() { return false; }
895
896 void set_cached_class_file(JvmtiCachedClassFileData *data) {
897 assert(data == NULL, "unexpected call with JVMTI disabled");
898 }
899 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
900
901 #endif // INCLUDE_JVMTI
902
903 bool has_nonstatic_concrete_methods() const {
904 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
905 }
906 void set_has_nonstatic_concrete_methods(bool b) {
907 if (b) {
908 _misc_flags |= _misc_has_nonstatic_concrete_methods;
909 } else {
910 _misc_flags &= ~_misc_has_nonstatic_concrete_methods;
911 }
912 }
913
914 bool declares_nonstatic_concrete_methods() const {
915 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
916 }
917 void set_declares_nonstatic_concrete_methods(bool b) {
918 if (b) {
919 _misc_flags |= _misc_declares_nonstatic_concrete_methods;
920 } else {
921 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods;
922 }
923 }
924
925 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
926 inline u2 next_method_idnum();
927 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
928
929 // generics support
930 Symbol* generic_signature() const {
931 return (_generic_signature_index == 0) ?
932 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
933 }
934 u2 generic_signature_index() const {
935 return _generic_signature_index;
936 }
937 void set_generic_signature_index(u2 sig_index) {
938 _generic_signature_index = sig_index;
939 }
940
941 u2 enclosing_method_data(int offset) const;
942 u2 enclosing_method_class_index() const {
943 return enclosing_method_data(enclosing_method_class_index_offset);
944 }
945 u2 enclosing_method_method_index() {
946 return enclosing_method_data(enclosing_method_method_index_offset);
947 }
948 void set_enclosing_method_indices(u2 class_index,
949 u2 method_index);
950
951 // jmethodID support
952 jmethodID get_jmethod_id(const methodHandle& method_h);
953 jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
954 jmethodID new_id, jmethodID* new_jmeths,
955 jmethodID* to_dealloc_id_p,
956 jmethodID** to_dealloc_jmeths_p);
957 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
958 size_t *length_p, jmethodID* id_p);
959 void ensure_space_for_methodids(int start_offset = 0);
960 jmethodID jmethod_id_or_null(Method* method);
961
962 // annotations support
963 Annotations* annotations() const { return _annotations; }
964 void set_annotations(Annotations* anno) { _annotations = anno; }
965
966 AnnotationArray* class_annotations() const {
967 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
968 }
969 Array<AnnotationArray*>* fields_annotations() const {
970 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
971 }
972 AnnotationArray* class_type_annotations() const {
973 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
974 }
975 Array<AnnotationArray*>* fields_type_annotations() const {
976 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
977 }
978 // allocation
979 instanceOop allocate_instance(TRAPS);
980
981 // additional member function to return a handle
982 instanceHandle allocate_instance_handle(TRAPS);
983
984 objArrayOop allocate_objArray(int n, int length, TRAPS);
985 // Helper function
986 static instanceOop register_finalizer(instanceOop i, TRAPS);
987
988 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
989 // if not, throw either an Error or an Exception.
990 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
991
992 // initialization
993 void call_class_initializer(TRAPS);
994 void set_initialization_state_and_notify(ClassState state, TRAPS);
995
996 // OopMapCache support
997 OopMapCache* oop_map_cache() { return _oop_map_cache; }
998 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
999 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
1000
1001 // JNI identifier support (for static fields - for jni performance)
1002 JNIid* jni_ids() { return _jni_ids; }
1003 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
1004 JNIid* jni_id_for(int offset);
1005
1006 // maintenance of deoptimization dependencies
1007 inline DependencyContext dependencies();
1008 int mark_dependent_nmethods(KlassDepChange& changes);
1009 void add_dependent_nmethod(nmethod* nm);
1010 void remove_dependent_nmethod(nmethod* nm);
1011 void clean_dependency_context();
1012
1013 // On-stack replacement support
1014 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
1015 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
1016 void add_osr_nmethod(nmethod* n);
1017 bool remove_osr_nmethod(nmethod* n);
1018 int mark_osr_nmethods(const Method* m);
1019 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
1020
1021 #if INCLUDE_JVMTI
1022 // Breakpoint support (see methods on Method* for details)
1023 BreakpointInfo* breakpoints() const { return _breakpoints; };
1024 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
1025 #endif
1026
1027 // support for stub routines
1028 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
1029 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;)
1030 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
1031
1032 // subclass/subinterface checks
1033 bool implements_interface(Klass* k) const;
1034 bool is_same_or_direct_interface(Klass* k) const;
1035
1036 #ifdef ASSERT
1037 // check whether this class or one of its superclasses was redefined
1038 bool has_redefined_this_or_super() const;
1039 #endif
1040
1041 // Access to the implementor of an interface.
1042 Klass* implementor() const;
1043 void set_implementor(Klass* k);
1044 int nof_implementors() const;
1045 void add_implementor(Klass* k); // k is a new class that implements this interface
1046 void init_implementor(); // initialize
1047
1048 // link this class into the implementors list of every interface it implements
1049 void process_interfaces(Thread *thread);
1050
1051 // virtual operations from Klass
1052 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
1053 Array<InstanceKlass*>* transitive_interfaces);
1054 bool can_be_primary_super_slow() const;
1055 int oop_size(oop obj) const { return size_helper(); }
1056 // slow because it's a virtual call and used for verifying the layout_helper.
1057 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
1058 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
1059
1060 // Iterators
1061 void do_local_static_fields(FieldClosure* cl);
1062 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
1063 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
1064
1065 void methods_do(void f(Method* method));
1066 void array_klasses_do(void f(Klass* k));
1067 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
1068
1069 static InstanceKlass* cast(Klass* k) {
1070 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
1071 }
1072
1073 static const InstanceKlass* cast(const Klass* k) {
1074 assert(k != NULL, "k should not be null");
1075 assert(k->is_instance_klass(), "cast to InstanceKlass");
1076 return static_cast<const InstanceKlass*>(k);
1077 }
1078
1079 virtual InstanceKlass* java_super() const {
1080 return (super() == NULL) ? NULL : cast(super());
1081 }
1082
1083 // Sizing (in words)
1084 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
1085
1086 static int size(int vtable_length, int itable_length,
1087 int nonstatic_oop_map_size,
1088 bool is_interface, bool is_unsafe_anonymous, bool has_stored_fingerprint) {
1089 return align_metadata_size(header_size() +
1090 vtable_length +
1091 itable_length +
1092 nonstatic_oop_map_size +
1093 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1094 (is_unsafe_anonymous ? (int)sizeof(Klass*)/wordSize : 0) +
1095 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0));
1096 }
1097 int size() const { return size(vtable_length(),
1098 itable_length(),
1099 nonstatic_oop_map_size(),
1100 is_interface(),
1101 is_unsafe_anonymous(),
1102 has_stored_fingerprint());
1103 }
1104
1105 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); }
1106 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
1107
1108 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1109
1110 oop static_field_base_raw() { return java_mirror(); }
1111
1112 OopMapBlock* start_of_nonstatic_oop_maps() const {
1113 return (OopMapBlock*)(start_of_itable() + itable_length());
1114 }
1115
1116 Klass** end_of_nonstatic_oop_maps() const {
1117 return (Klass**)(start_of_nonstatic_oop_maps() +
1118 nonstatic_oop_map_count());
1119 }
1120
1121 Klass* volatile* adr_implementor() const {
1122 if (is_interface()) {
1123 return (Klass* volatile*)end_of_nonstatic_oop_maps();
1124 } else {
1125 return NULL;
1126 }
1127 };
1128
1129 InstanceKlass** adr_unsafe_anonymous_host() const {
1130 if (is_unsafe_anonymous()) {
1131 InstanceKlass** adr_impl = (InstanceKlass**)adr_implementor();
1132 if (adr_impl != NULL) {
1133 return adr_impl + 1;
1134 } else {
1135 return (InstanceKlass **)end_of_nonstatic_oop_maps();
1136 }
1137 } else {
1138 return NULL;
1139 }
1140 }
1141
1142 address adr_fingerprint() const {
1143 if (has_stored_fingerprint()) {
1144 InstanceKlass** adr_host = adr_unsafe_anonymous_host();
1145 if (adr_host != NULL) {
1146 return (address)(adr_host + 1);
1147 }
1148
1149 Klass* volatile* adr_impl = adr_implementor();
1150 if (adr_impl != NULL) {
1151 return (address)(adr_impl + 1);
1152 }
1153
1154 return (address)end_of_nonstatic_oop_maps();
1155 } else {
1156 return NULL;
1157 }
1158 }
1159
1160 // Use this to return the size of an instance in heap words:
1161 int size_helper() const {
1162 return layout_helper_to_size_helper(layout_helper());
1163 }
1164
1165 // This bit is initialized in classFileParser.cpp.
1166 // It is false under any of the following conditions:
1167 // - the class is abstract (including any interface)
1168 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1169 // - the class size is larger than FastAllocateSizeLimit
1170 // - the class is java/lang/Class, which cannot be allocated directly
1171 bool can_be_fastpath_allocated() const {
1172 return !layout_helper_needs_slow_path(layout_helper());
1173 }
1174
1175 // Java itable
1176 klassItable itable() const; // return klassItable wrapper
1177 Method* method_at_itable(Klass* holder, int index, TRAPS);
1178
1179 #if INCLUDE_JVMTI
1180 void adjust_default_methods(bool* trace_name_printed);
1181 #endif // INCLUDE_JVMTI
1182
1183 void clean_weak_instanceklass_links();
1184 private:
1185 void clean_implementors_list();
1186 void clean_method_data();
1187
1188 public:
1189 // Explicit metaspace deallocation of fields
1190 // For RedefineClasses and class file parsing errors, we need to deallocate
1191 // instanceKlasses and the metadata they point to.
1192 void deallocate_contents(ClassLoaderData* loader_data);
1193 static void deallocate_methods(ClassLoaderData* loader_data,
1194 Array<Method*>* methods);
1195 void static deallocate_interfaces(ClassLoaderData* loader_data,
1196 const Klass* super_klass,
1197 Array<InstanceKlass*>* local_interfaces,
1198 Array<InstanceKlass*>* transitive_interfaces);
1199 void static deallocate_record_components(ClassLoaderData* loader_data,
1200 Array<RecordComponent*>* record_component);
1201
1202 // The constant pool is on stack if any of the methods are executing or
1203 // referenced by handles.
1204 bool on_stack() const { return _constants->on_stack(); }
1205
1206 // callbacks for actions during class unloading
1207 static void unload_class(InstanceKlass* ik);
1208 static void release_C_heap_structures(InstanceKlass* ik);
1209
1210 // Naming
1211 const char* signature_name() const;
1212
1213 // Extract package name from a fully qualified class name
1214 // *bad_class_name is set to true if there's a problem with parsing class_name, to
1215 // distinguish from a class_name with no package name, as both cases have a NULL return value
1216 static Symbol* package_from_name(const Symbol* class_name, bool* bad_class_name = NULL);
1217
1218 // Oop fields (and metadata) iterators
1219 //
1220 // The InstanceKlass iterators also visits the Object's klass.
1221
1222 // Forward iteration
1223 public:
1224 // Iterate over all oop fields in the oop maps.
1225 template <typename T, class OopClosureType>
1226 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1227
1228 // Iterate over all oop fields and metadata.
1229 template <typename T, class OopClosureType>
1230 inline void oop_oop_iterate(oop obj, OopClosureType* closure);
1231
1232 // Iterate over all oop fields in one oop map.
1233 template <typename T, class OopClosureType>
1234 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1235
1236
1237 // Reverse iteration
1238 // Iterate over all oop fields and metadata.
1239 template <typename T, class OopClosureType>
1240 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1241
1242 private:
1243 // Iterate over all oop fields in the oop maps.
1244 template <typename T, class OopClosureType>
1245 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1246
1247 // Iterate over all oop fields in one oop map.
1248 template <typename T, class OopClosureType>
1249 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1250
1251
1252 // Bounded range iteration
1253 public:
1254 // Iterate over all oop fields in the oop maps.
1255 template <typename T, class OopClosureType>
1256 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1257
1258 // Iterate over all oop fields and metadata.
1259 template <typename T, class OopClosureType>
1260 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1261
1262 private:
1263 // Iterate over all oop fields in one oop map.
1264 template <typename T, class OopClosureType>
1265 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1266
1267
1268 public:
1269 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1270
1271 private:
1272 // initialization state
1273 void set_init_state(ClassState state);
1274 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1275 void set_init_thread(Thread *thread) { _init_thread = thread; }
1276
1277 // The RedefineClasses() API can cause new method idnums to be needed
1278 // which will cause the caches to grow. Safety requires different
1279 // cache management logic if the caches can grow instead of just
1280 // going from NULL to non-NULL.
1281 bool idnum_can_increment() const { return has_been_redefined(); }
1282 inline jmethodID* methods_jmethod_ids_acquire() const;
1283 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1284
1285 // Lock during initialization
1286 public:
1287 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1288 // Must be one per class and it has to be a VM internal object so java code
1289 // cannot lock it (like the mirror).
1290 // It has to be an object not a Mutex because it's held through java calls.
1291 oop init_lock() const;
1292 private:
1293 void fence_and_clear_init_lock();
1294
1295 bool link_class_impl (TRAPS);
1296 bool verify_code (TRAPS);
1297 void initialize_impl (TRAPS);
1298 void initialize_super_interfaces (TRAPS);
1299 void eager_initialize_impl ();
1300 /* jni_id_for_impl for jfieldID only */
1301 JNIid* jni_id_for_impl (int offset);
1302
1303 // Returns the array class for the n'th dimension
1304 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1305
1306 // Returns the array class with this class as element type
1307 Klass* array_klass_impl(bool or_null, TRAPS);
1308
1309 // find a local method (returns NULL if not found)
1310 Method* find_method_impl(const Symbol* name,
1311 const Symbol* signature,
1312 OverpassLookupMode overpass_mode,
1313 StaticLookupMode static_mode,
1314 PrivateLookupMode private_mode) const;
1315
1316 static Method* find_method_impl(const Array<Method*>* methods,
1317 const Symbol* name,
1318 const Symbol* signature,
1319 OverpassLookupMode overpass_mode,
1320 StaticLookupMode static_mode,
1321 PrivateLookupMode private_mode);
1322
1323 // Free CHeap allocated fields.
1324 void release_C_heap_structures();
1325
1326 #if INCLUDE_JVMTI
1327 // RedefineClasses support
1328 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1329 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1330 #endif
1331 public:
1332 // CDS support - remove and restore oops from metadata. Oops are not shared.
1333 virtual void remove_unshareable_info();
1334 virtual void remove_java_mirror();
1335 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1336
1337 // jvm support
1338 jint compute_modifier_flags(TRAPS) const;
1339
1340 public:
1341 // JVMTI support
1342 jint jvmti_class_status() const;
1343
1344 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1345
1346 public:
1347 // Printing
1348 #ifndef PRODUCT
1349 void print_on(outputStream* st) const;
1350 #endif
1351 void print_value_on(outputStream* st) const;
1352
1353 void oop_print_value_on(oop obj, outputStream* st);
1354
1355 #ifndef PRODUCT
1356 void oop_print_on (oop obj, outputStream* st);
1357
1358 void print_dependent_nmethods(bool verbose = false);
1359 bool is_dependent_nmethod(nmethod* nm);
1360 bool verify_itable_index(int index);
1361 #endif
1362
1363 const char* internal_name() const;
1364
1365 // Verification
1366 void verify_on(outputStream* st);
1367
1368 void oop_verify_on(oop obj, outputStream* st);
1369
1370 // Logging
1371 void print_class_load_logging(ClassLoaderData* loader_data,
1372 const char* module_name,
1373 const ClassFileStream* cfs) const;
1374 };
1375
1376 // for adding methods
1377 // UNSET_IDNUM return means no more ids available
1378 inline u2 InstanceKlass::next_method_idnum() {
1379 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1380 return ConstMethod::UNSET_IDNUM; // no more ids available
1381 } else {
1382 return _idnum_allocated_count++;
1383 }
1384 }
1385
1386
1387 /* JNIid class for jfieldIDs only */
1388 class JNIid: public CHeapObj<mtClass> {
1389 friend class VMStructs;
1390 private:
1391 Klass* _holder;
1392 JNIid* _next;
1393 int _offset;
1394 #ifdef ASSERT
1395 bool _is_static_field_id;
1396 #endif
1397
1398 public:
1399 // Accessors
1400 Klass* holder() const { return _holder; }
1401 int offset() const { return _offset; }
1402 JNIid* next() { return _next; }
1403 // Constructor
1404 JNIid(Klass* holder, int offset, JNIid* next);
1405 // Identifier lookup
1406 JNIid* find(int offset);
1407
1408 bool find_local_field(fieldDescriptor* fd) {
1409 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1410 }
1411
1412 static void deallocate(JNIid* id);
1413 // Debugging
1414 #ifdef ASSERT
1415 bool is_static_field_id() const { return _is_static_field_id; }
1416 void set_is_static_field_id() { _is_static_field_id = true; }
1417 #endif
1418 void verify(Klass* holder);
1419 };
1420
1421 // An iterator that's used to access the inner classes indices in the
1422 // InstanceKlass::_inner_classes array.
1423 class InnerClassesIterator : public StackObj {
1424 private:
1425 Array<jushort>* _inner_classes;
1426 int _length;
1427 int _idx;
1428 public:
1429
1430 InnerClassesIterator(const InstanceKlass* k) {
1431 _inner_classes = k->inner_classes();
1432 if (k->inner_classes() != NULL) {
1433 _length = _inner_classes->length();
1434 // The inner class array's length should be the multiple of
1435 // inner_class_next_offset if it only contains the InnerClasses
1436 // attribute data, or it should be
1437 // n*inner_class_next_offset+enclosing_method_attribute_size
1438 // if it also contains the EnclosingMethod data.
1439 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1440 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1441 "just checking");
1442 // Remove the enclosing_method portion if exists.
1443 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1444 _length -= InstanceKlass::enclosing_method_attribute_size;
1445 }
1446 } else {
1447 _length = 0;
1448 }
1449 _idx = 0;
1450 }
1451
1452 int length() const {
1453 return _length;
1454 }
1455
1456 void next() {
1457 _idx += InstanceKlass::inner_class_next_offset;
1458 }
1459
1460 bool done() const {
1461 return (_idx >= _length);
1462 }
1463
1464 u2 inner_class_info_index() const {
1465 return _inner_classes->at(
1466 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1467 }
1468
1469 void set_inner_class_info_index(u2 index) {
1470 _inner_classes->at_put(
1471 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1472 }
1473
1474 u2 outer_class_info_index() const {
1475 return _inner_classes->at(
1476 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1477 }
1478
1479 void set_outer_class_info_index(u2 index) {
1480 _inner_classes->at_put(
1481 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1482 }
1483
1484 u2 inner_name_index() const {
1485 return _inner_classes->at(
1486 _idx + InstanceKlass::inner_class_inner_name_offset);
1487 }
1488
1489 void set_inner_name_index(u2 index) {
1490 _inner_classes->at_put(
1491 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1492 }
1493
1494 u2 inner_access_flags() const {
1495 return _inner_classes->at(
1496 _idx + InstanceKlass::inner_class_access_flags_offset);
1497 }
1498 };
1499
1500 #endif // SHARE_OOPS_INSTANCEKLASS_HPP
--- EOF ---