1 /*
2 * Copyright (c) 1997, 2019, 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
45 // An InstanceKlass is the VM level representation of a Java class.
46 // It contains all information needed for at class at execution runtime.
47
48 // InstanceKlass embedded field layout (after declared fields):
49 // [EMBEDDED Java vtable ] size in words = vtable_len
50 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
51 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
52 // indicating where oops are located in instances of this klass.
53 // [EMBEDDED implementor of the interface] only exist for interface
54 // [EMBEDDED unsafe_anonymous_host klass] only exist for an unsafe anonymous class (JSR 292 enabled)
55 // [EMBEDDED fingerprint ] only if should_store_fingerprint()==true
56
57
58 // forward declaration for class -- see below for definition
59 #if INCLUDE_JVMTI
60 class BreakpointInfo;
61 #endif
62 class ClassFileParser;
63 class ClassFileStream;
64 class KlassDepChange;
65 class DependencyContext;
66 class fieldDescriptor;
67 class jniIdMapBase;
68 class JNIid;
69 class JvmtiCachedClassFieldMap;
70 class nmethodBucket;
71 class OopMapCache;
72 class InterpreterOopMap;
73 class PackageEntry;
74 class ModuleEntry;
75
76 // This is used in iterators below.
77 class FieldClosure: public StackObj {
78 public:
79 virtual void do_field(fieldDescriptor* fd) = 0;
80 };
81
82 #ifndef PRODUCT
83 // Print fields.
84 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
85 class FieldPrinter: public FieldClosure {
86 oop _obj;
87 outputStream* _st;
88 public:
89 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
90 void do_field(fieldDescriptor* fd);
91 };
92 #endif // !PRODUCT
93
94 // Describes where oops are located in instances of this klass.
95 class OopMapBlock {
96 public:
97 // Byte offset of the first oop mapped by this block.
98 int offset() const { return _offset; }
99 void set_offset(int offset) { _offset = offset; }
100
101 // Number of oops in this block.
102 uint count() const { return _count; }
103 void set_count(uint count) { _count = count; }
104
105 // sizeof(OopMapBlock) in words.
106 static const int size_in_words() {
107 return align_up((int)sizeof(OopMapBlock), wordSize) >>
108 LogBytesPerWord;
109 }
110
111 private:
112 int _offset;
113 uint _count;
114 };
115
116 struct JvmtiCachedClassFileData;
117
118 class InstanceKlass: public Klass {
119 friend class VMStructs;
120 friend class JVMCIVMStructs;
121 friend class ClassFileParser;
122 friend class CompileReplay;
123
124 public:
125 static const KlassID ID = InstanceKlassID;
126
127 protected:
128 InstanceKlass(const ClassFileParser& parser, unsigned kind, KlassID id = ID);
129
130 public:
131 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
132
133 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
134 // of the class loading & initialization procedure, and the use of the states.
135 enum ClassState {
136 allocated, // allocated (but not yet linked)
137 loaded, // loaded and inserted in class hierarchy (but not linked yet)
138 linked, // successfully linked/verified (but not initialized yet)
139 being_initialized, // currently running class initializer
140 fully_initialized, // initialized (successfull final state)
141 initialization_error // error happened during initialization
142 };
143
144 private:
145 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
146
147 protected:
148 // If you add a new field that points to any metaspace object, you
149 // must add this field to InstanceKlass::metaspace_pointers_do().
150
151 // Annotations for this class
152 Annotations* _annotations;
153 // Package this class is defined in
154 PackageEntry* _package_entry;
155 // Array classes holding elements of this class.
156 Klass* volatile _array_klasses;
157 // Constant pool for this class.
158 ConstantPool* _constants;
159 // The InnerClasses attribute and EnclosingMethod attribute. The
160 // _inner_classes is an array of shorts. If the class has InnerClasses
161 // attribute, then the _inner_classes array begins with 4-tuples of shorts
162 // [inner_class_info_index, outer_class_info_index,
163 // inner_name_index, inner_class_access_flags] for the InnerClasses
164 // attribute. If the EnclosingMethod attribute exists, it occupies the
165 // last two shorts [class_index, method_index] of the array. If only
166 // the InnerClasses attribute exists, the _inner_classes array length is
167 // number_of_inner_classes * 4. If the class has both InnerClasses
168 // and EnclosingMethod attributes the _inner_classes array length is
169 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
170 Array<jushort>* _inner_classes;
171
172 // The NestMembers attribute. An array of shorts, where each is a
173 // class info index for the class that is a nest member. This data
174 // has not been validated.
175 Array<jushort>* _nest_members;
176
177 // The NestHost attribute. The class info index for the class
178 // that is the nest-host of this class. This data has not been validated.
179 jushort _nest_host_index;
180
181 // Resolved nest-host klass: either true nest-host or self if we are not nested.
182 // By always being set it makes nest-member access checks simpler.
183 InstanceKlass* _nest_host;
184
185 // the source debug extension for this klass, NULL if not specified.
186 // Specified as UTF-8 string without terminating zero byte in the classfile,
187 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
188 const char* _source_debug_extension;
189 // Array name derived from this class which needs unreferencing
190 // if this class is unloaded.
191 Symbol* _array_name;
192
193 // Number of heapOopSize words used by non-static fields in this klass
194 // (including inherited fields but after header_size()).
195 int _nonstatic_field_size;
196 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
197 // Constant pool index to the utf8 entry of the Generic signature,
198 // or 0 if none.
199 u2 _generic_signature_index;
200 // Constant pool index to the utf8 entry for the name of source file
201 // containing this klass, 0 if not specified.
202 u2 _source_file_name_index;
203 u2 _static_oop_field_count;// number of static oop fields in this klass
204 u2 _java_fields_count; // The number of declared Java fields
205 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
206
207 int _itable_len; // length of Java itable (in words)
208 // _is_marked_dependent can be set concurrently, thus cannot be part of the
209 // _misc_flags.
210 bool _is_marked_dependent; // used for marking during flushing and deoptimization
211 bool _is_being_redefined; // used for locking redefinition
212
213 // The low two bits of _misc_flags contains the kind field.
214 // This can be used to quickly discriminate among the four kinds of
215 // InstanceKlass.
216
217 static const unsigned _misc_kind_field_size = 2;
218 static const unsigned _misc_kind_field_pos = 0;
219 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
220
221 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
222 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
223 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
224 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
225
226 // Start after _misc_kind field.
227 enum {
228 _misc_rewritten = 1 << 2, // methods rewritten.
229 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops
230 _misc_should_verify_class = 1 << 4, // allow caching of preverification
231 _misc_is_unsafe_anonymous = 1 << 5, // has embedded _unsafe_anonymous_host field
232 _misc_is_contended = 1 << 6, // marked with contended annotation
233 _misc_has_nonstatic_concrete_methods = 1 << 7, // class/superclass/implemented interfaces has non-static, concrete methods
234 _misc_declares_nonstatic_concrete_methods = 1 << 8, // directly declares non-static, concrete methods
235 _misc_has_been_redefined = 1 << 9, // class has been redefined
236 _misc_has_passed_fingerprint_check = 1 << 10, // when this class was loaded, the fingerprint computed from its
237 // code source was found to be matching the value recorded by AOT.
238 _misc_is_scratch_class = 1 << 11, // class is the redefined scratch class
239 _misc_is_shared_boot_class = 1 << 12, // defining class loader is boot class loader
240 _misc_is_shared_platform_class = 1 << 13, // defining class loader is platform class loader
241 _misc_is_shared_app_class = 1 << 14, // defining class loader is app class loader
242 _misc_has_resolved_methods = 1 << 15 // resolved methods table entries added for this class
243 };
244 u2 loader_type_bits() {
245 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
246 }
247 u2 _misc_flags;
248 u2 _minor_version; // minor version number of class file
249 u2 _major_version; // major version number of class file
250 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recursive initialization)
251 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
252 JNIid* _jni_ids; // First JNI identifier for static fields in this class
253 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
254 nmethodBucket* volatile _dep_context; // packed DependencyContext structure
255 uint64_t volatile _dep_context_last_cleaned;
256 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
257 #if INCLUDE_JVMTI
258 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
259 // Linked instanceKlasses of previous versions
260 InstanceKlass* _previous_versions;
261 // JVMTI fields can be moved to their own structure - see 6315920
262 // JVMTI: cached class file, before retransformable agent modified it in CFLH
263 JvmtiCachedClassFileData* _cached_class_file;
264 #endif
265
266 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
267
268 // Class states are defined as ClassState (see above).
269 // Place the _init_state here to utilize the unused 2-byte after
270 // _idnum_allocated_count.
271 u1 _init_state; // state of class
272 u1 _reference_type; // reference type
273
274 u2 _this_class_index; // constant pool entry
275 #if INCLUDE_JVMTI
276 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
277 #endif
278
279 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
280
281 // Method array.
282 Array<Method*>* _methods;
283 // Default Method Array, concrete methods inherited from interfaces
284 Array<Method*>* _default_methods;
285 // Interfaces (InstanceKlass*s) this class declares locally to implement.
286 Array<InstanceKlass*>* _local_interfaces;
287 // Interfaces (InstanceKlass*s) this class implements transitively.
288 Array<InstanceKlass*>* _transitive_interfaces;
289 // Int array containing the original order of method in the class file (for JVMTI).
290 Array<int>* _method_ordering;
291 // Int array containing the vtable_indices for default_methods
292 // offset matches _default_methods offset
293 Array<int>* _default_vtable_indices;
294
295 // Instance and static variable information, starts with 6-tuples of shorts
296 // [access, name index, sig index, initval index, low_offset, high_offset]
297 // for all fields, followed by the generic signature data at the end of
298 // the array. Only fields with generic signature attributes have the generic
299 // signature data set in the array. The fields array looks like following:
300 //
301 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
302 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
303 // ...
304 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
305 // [generic signature index]
306 // [generic signature index]
307 // ...
308 Array<u2>* _fields;
309
310 // embedded Java vtable follows here
311 // embedded Java itables follows here
312 // embedded static fields follows here
313 // embedded nonstatic oop-map blocks follows here
314 // embedded implementor of this interface follows here
315 // The embedded implementor only exists if the current klass is an
316 // iterface. The possible values of the implementor fall into following
317 // three cases:
318 // NULL: no implementor.
319 // A Klass* that's not itself: one implementor.
320 // Itself: more than one implementors.
321 // embedded unsafe_anonymous_host klass follows here
322 // The embedded host klass only exists in an unsafe anonymous class for
323 // dynamic language support (JSR 292 enabled). The host class grants
324 // its access privileges to this class also. The host class is either
325 // named, or a previously loaded unsafe anonymous class. A non-anonymous class
326 // or an anonymous class loaded through normal classloading does not
327 // have this embedded field.
328 //
329
330 friend class SystemDictionary;
331
332 static bool _disable_method_binary_search;
333
334 public:
335 u2 loader_type() {
336 return _misc_flags & loader_type_bits();
337 }
338
339 bool is_shared_boot_class() const {
340 return (_misc_flags & _misc_is_shared_boot_class) != 0;
341 }
342 bool is_shared_platform_class() const {
343 return (_misc_flags & _misc_is_shared_platform_class) != 0;
344 }
345 bool is_shared_app_class() const {
346 return (_misc_flags & _misc_is_shared_app_class) != 0;
347 }
348
349 void clear_class_loader_type() {
350 _misc_flags &= ~loader_type_bits();
351 }
352
353 void set_class_loader_type(s2 loader_type);
354
355 bool has_nonstatic_fields() const {
356 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
357 }
358 void set_has_nonstatic_fields(bool b) {
359 if (b) {
360 _misc_flags |= _misc_has_nonstatic_fields;
361 } else {
362 _misc_flags &= ~_misc_has_nonstatic_fields;
363 }
364 }
365
366 // field sizes
367 int nonstatic_field_size() const { return _nonstatic_field_size; }
368 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
369
370 int static_field_size() const { return _static_field_size; }
371 void set_static_field_size(int size) { _static_field_size = size; }
372
373 int static_oop_field_count() const { return (int)_static_oop_field_count; }
374 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
375
376 // Java itable
377 int itable_length() const { return _itable_len; }
378 void set_itable_length(int len) { _itable_len = len; }
379
380 // array klasses
381 Klass* array_klasses() const { return _array_klasses; }
382 inline Klass* array_klasses_acquire() const; // load with acquire semantics
383 void set_array_klasses(Klass* k) { _array_klasses = k; }
384 inline void release_set_array_klasses(Klass* k); // store with release semantics
385
386 // methods
387 Array<Method*>* methods() const { return _methods; }
388 void set_methods(Array<Method*>* a) { _methods = a; }
389 Method* method_with_idnum(int idnum);
390 Method* method_with_orig_idnum(int idnum);
391 Method* method_with_orig_idnum(int idnum, int version);
392
393 // method ordering
394 Array<int>* method_ordering() const { return _method_ordering; }
395 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
396 void copy_method_ordering(const intArray* m, TRAPS);
397
398 // default_methods
399 Array<Method*>* default_methods() const { return _default_methods; }
400 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
401
402 // default method vtable_indices
403 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
404 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
405 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
406
407 // interfaces
408 Array<InstanceKlass*>* local_interfaces() const { return _local_interfaces; }
409 void set_local_interfaces(Array<InstanceKlass*>* a) {
410 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
411 _local_interfaces = a; }
412
413 Array<InstanceKlass*>* transitive_interfaces() const { return _transitive_interfaces; }
414 void set_transitive_interfaces(Array<InstanceKlass*>* a) {
415 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
416 _transitive_interfaces = a;
417 }
418
419 private:
420 friend class fieldDescriptor;
421 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
422
423 public:
424 int field_offset (int index) const { return field(index)->offset(); }
425 int field_access_flags(int index) const { return field(index)->access_flags(); }
426 Symbol* field_name (int index) const { return field(index)->name(constants()); }
427 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
428
429 // Number of Java declared fields
430 int java_fields_count() const { return (int)_java_fields_count; }
431
432 Array<u2>* fields() const { return _fields; }
433 void set_fields(Array<u2>* f, u2 java_fields_count) {
434 guarantee(_fields == NULL || f == NULL, "Just checking");
435 _fields = f;
436 _java_fields_count = java_fields_count;
437 }
438
439 // inner classes
440 Array<u2>* inner_classes() const { return _inner_classes; }
441 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
442
443 // nest members
444 Array<u2>* nest_members() const { return _nest_members; }
445 void set_nest_members(Array<u2>* m) { _nest_members = m; }
446
447 // nest-host index
448 jushort nest_host_index() const { return _nest_host_index; }
449 void set_nest_host_index(u2 i) { _nest_host_index = i; }
450
451 private:
452 // Called to verify that k is a member of this nest - does not look at k's nest-host
453 bool has_nest_member(InstanceKlass* k, TRAPS) const;
454 public:
455 // Returns nest-host class, resolving and validating it if needed
456 // Returns NULL if an exception occurs during loading, or validation fails
457 InstanceKlass* nest_host(Symbol* validationException, TRAPS);
458 // Check if this klass is a nestmate of k - resolves this nest-host and k's
459 bool has_nestmate_access_to(InstanceKlass* k, TRAPS);
460
461 enum InnerClassAttributeOffset {
462 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
463 inner_class_inner_class_info_offset = 0,
464 inner_class_outer_class_info_offset = 1,
465 inner_class_inner_name_offset = 2,
466 inner_class_access_flags_offset = 3,
467 inner_class_next_offset = 4
468 };
469
470 enum EnclosingMethodAttributeOffset {
471 enclosing_method_class_index_offset = 0,
472 enclosing_method_method_index_offset = 1,
473 enclosing_method_attribute_size = 2
474 };
475
476 // method override check
477 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
478
479 // package
480 PackageEntry* package() const { return _package_entry; }
481 ModuleEntry* module() const;
482 bool in_unnamed_package() const { return (_package_entry == NULL); }
483 void set_package(PackageEntry* p) { _package_entry = p; }
484 void set_package(ClassLoaderData* loader_data, TRAPS);
485 bool is_same_class_package(const Klass* class2) const;
486 bool is_same_class_package(oop other_class_loader, const Symbol* other_class_name) const;
487
488 // find an enclosing class
489 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
490
491 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
492 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
493
494 private:
495 // Check prohibited package ("java/" only loadable by boot or platform loaders)
496 static void check_prohibited_package(Symbol* class_name,
497 ClassLoaderData* loader_data,
498 TRAPS);
499 public:
500 // initialization state
501 bool is_loaded() const { return _init_state >= loaded; }
502 bool is_linked() const { return _init_state >= linked; }
503 bool is_initialized() const { return _init_state == fully_initialized; }
504 bool is_not_initialized() const { return _init_state < being_initialized; }
505 bool is_being_initialized() const { return _init_state == being_initialized; }
506 bool is_in_error_state() const { return _init_state == initialization_error; }
507 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
508 ClassState init_state() { return (ClassState)_init_state; }
509 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
510
511 // defineClass specified verification
512 bool should_verify_class() const {
513 return (_misc_flags & _misc_should_verify_class) != 0;
514 }
515 void set_should_verify_class(bool value) {
516 if (value) {
517 _misc_flags |= _misc_should_verify_class;
518 } else {
519 _misc_flags &= ~_misc_should_verify_class;
520 }
521 }
522
523 // marking
524 bool is_marked_dependent() const { return _is_marked_dependent; }
525 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
526
527 // initialization (virtuals from Klass)
528 bool should_be_initialized() const; // means that initialize should be called
529 void initialize(TRAPS);
530 void link_class(TRAPS);
531 bool link_class_or_fail(TRAPS); // returns false on failure
532 void rewrite_class(TRAPS);
533 void link_methods(TRAPS);
534 Method* class_initializer() const;
535
536 // set the class to initialized if no static initializer is present
537 void eager_initialize(Thread *thread);
538
539 // reference type
540 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
541 void set_reference_type(ReferenceType t) {
542 assert(t == (u1)t, "overflow");
543 _reference_type = (u1)t;
544 }
545
546 // this class cp index
547 u2 this_class_index() const { return _this_class_index; }
548 void set_this_class_index(u2 index) { _this_class_index = index; }
549
550 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
551
552 // find local field, returns true if found
553 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
554 // find field in direct superinterfaces, returns the interface in which the field is defined
555 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
556 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
557 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
558 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
559 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
560
561 // find a non-static or static field given its offset within the class.
562 bool contains_field_offset(int offset) {
563 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
564 }
565
566 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
567 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
568
569 private:
570 static int quick_search(const Array<Method*>* methods, const Symbol* name);
571
572 public:
573 static void disable_method_binary_search() {
574 _disable_method_binary_search = true;
575 }
576
577 // find a local method (returns NULL if not found)
578 Method* find_method(const Symbol* name, const Symbol* signature) const;
579 static Method* find_method(const Array<Method*>* methods,
580 const Symbol* name,
581 const Symbol* signature);
582
583 // find a local method, but skip static methods
584 Method* find_instance_method(const Symbol* name, const Symbol* signature,
585 PrivateLookupMode private_mode = find_private) const;
586 static Method* find_instance_method(const Array<Method*>* methods,
587 const Symbol* name,
588 const Symbol* signature,
589 PrivateLookupMode private_mode = find_private);
590
591 // find a local method (returns NULL if not found)
592 Method* find_local_method(const Symbol* name,
593 const Symbol* signature,
594 OverpassLookupMode overpass_mode,
595 StaticLookupMode static_mode,
596 PrivateLookupMode private_mode) const;
597
598 // find a local method from given methods array (returns NULL if not found)
599 static Method* find_local_method(const Array<Method*>* methods,
600 const Symbol* name,
601 const Symbol* signature,
602 OverpassLookupMode overpass_mode,
603 StaticLookupMode static_mode,
604 PrivateLookupMode private_mode);
605
606 // find a local method index in methods or default_methods (returns -1 if not found)
607 static int find_method_index(const Array<Method*>* methods,
608 const Symbol* name,
609 const Symbol* signature,
610 OverpassLookupMode overpass_mode,
611 StaticLookupMode static_mode,
612 PrivateLookupMode private_mode);
613
614 // lookup operation (returns NULL if not found)
615 Method* uncached_lookup_method(const Symbol* name,
616 const Symbol* signature,
617 OverpassLookupMode overpass_mode,
618 PrivateLookupMode private_mode = find_private) const;
619
620 // lookup a method in all the interfaces that this class implements
621 // (returns NULL if not found)
622 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
623
624 // lookup a method in local defaults then in all interfaces
625 // (returns NULL if not found)
626 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
627
628 // Find method indices by name. If a method with the specified name is
629 // found the index to the first method is returned, and 'end' is filled in
630 // with the index of first non-name-matching method. If no method is found
631 // -1 is returned.
632 int find_method_by_name(const Symbol* name, int* end) const;
633 static int find_method_by_name(const Array<Method*>* methods,
634 const Symbol* name, int* end);
635
636 // constant pool
637 ConstantPool* constants() const { return _constants; }
638 void set_constants(ConstantPool* c) { _constants = c; }
639
640 // protection domain
641 oop protection_domain() const;
642
643 // signers
644 objArrayOop signers() const;
645
646 // host class
647 InstanceKlass* unsafe_anonymous_host() const {
648 InstanceKlass** hk = adr_unsafe_anonymous_host();
649 if (hk == NULL) {
650 assert(!is_unsafe_anonymous(), "Unsafe anonymous classes have host klasses");
651 return NULL;
652 } else {
653 assert(*hk != NULL, "host klass should always be set if the address is not null");
654 assert(is_unsafe_anonymous(), "Only unsafe anonymous classes have host klasses");
655 return *hk;
656 }
657 }
658 void set_unsafe_anonymous_host(const InstanceKlass* host) {
659 assert(is_unsafe_anonymous(), "not unsafe anonymous");
660 const InstanceKlass** addr = (const InstanceKlass **)adr_unsafe_anonymous_host();
661 assert(addr != NULL, "no reversed space");
662 if (addr != NULL) {
663 *addr = host;
664 }
665 }
666 bool is_unsafe_anonymous() const {
667 return (_misc_flags & _misc_is_unsafe_anonymous) != 0;
668 }
669 void set_is_unsafe_anonymous(bool value) {
670 if (value) {
671 _misc_flags |= _misc_is_unsafe_anonymous;
672 } else {
673 _misc_flags &= ~_misc_is_unsafe_anonymous;
674 }
675 }
676
677 bool is_contended() const {
678 return (_misc_flags & _misc_is_contended) != 0;
679 }
680 void set_is_contended(bool value) {
681 if (value) {
682 _misc_flags |= _misc_is_contended;
683 } else {
684 _misc_flags &= ~_misc_is_contended;
685 }
686 }
687
688 // source file name
689 Symbol* source_file_name() const {
690 return (_source_file_name_index == 0) ?
691 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
692 }
693 u2 source_file_name_index() const {
694 return _source_file_name_index;
695 }
696 void set_source_file_name_index(u2 sourcefile_index) {
697 _source_file_name_index = sourcefile_index;
698 }
699
700 // minor and major version numbers of class file
701 u2 minor_version() const { return _minor_version; }
702 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
703 u2 major_version() const { return _major_version; }
704 void set_major_version(u2 major_version) { _major_version = major_version; }
705
706 // source debug extension
707 const char* source_debug_extension() const { return _source_debug_extension; }
708 void set_source_debug_extension(const char* array, int length);
709
710 // symbol unloading support (refcount already added)
711 Symbol* array_name() { return _array_name; }
712 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
713
714 // nonstatic oop-map blocks
715 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
716 return oop_map_count * OopMapBlock::size_in_words();
717 }
718 unsigned int nonstatic_oop_map_count() const {
719 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
720 }
721 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
722 void set_nonstatic_oop_map_size(int words) {
723 _nonstatic_oop_map_size = words;
724 }
725
726 #if INCLUDE_JVMTI
727 // Redefinition locking. Class can only be redefined by one thread at a time.
728 bool is_being_redefined() const { return _is_being_redefined; }
729 void set_is_being_redefined(bool value) { _is_being_redefined = value; }
730
731 // RedefineClasses() support for previous versions:
732 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
733 void purge_previous_version_list();
734
735 InstanceKlass* previous_versions() const { return _previous_versions; }
736 #else
737 InstanceKlass* previous_versions() const { return NULL; }
738 #endif
739
740 InstanceKlass* get_klass_version(int version) {
741 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
742 if (ik->constants()->version() == version) {
743 return ik;
744 }
745 }
746 return NULL;
747 }
748
749 bool has_been_redefined() const {
750 return (_misc_flags & _misc_has_been_redefined) != 0;
751 }
752 void set_has_been_redefined() {
753 _misc_flags |= _misc_has_been_redefined;
754 }
755
756 bool has_passed_fingerprint_check() const {
757 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0;
758 }
759 void set_has_passed_fingerprint_check(bool b) {
760 if (b) {
761 _misc_flags |= _misc_has_passed_fingerprint_check;
762 } else {
763 _misc_flags &= ~_misc_has_passed_fingerprint_check;
764 }
765 }
766 bool supers_have_passed_fingerprint_checks();
767
768 static bool should_store_fingerprint(bool is_unsafe_anonymous);
769 bool should_store_fingerprint() const { return should_store_fingerprint(is_unsafe_anonymous()); }
770 bool has_stored_fingerprint() const;
771 uint64_t get_stored_fingerprint() const;
772 void store_fingerprint(uint64_t fingerprint);
773
774 bool is_scratch_class() const {
775 return (_misc_flags & _misc_is_scratch_class) != 0;
776 }
777
778 void set_is_scratch_class() {
779 _misc_flags |= _misc_is_scratch_class;
780 }
781
782 bool has_resolved_methods() const {
783 return (_misc_flags & _misc_has_resolved_methods) != 0;
784 }
785
786 void set_has_resolved_methods() {
787 _misc_flags |= _misc_has_resolved_methods;
788 }
789 private:
790
791 void set_kind(unsigned kind) {
792 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
793 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
794 unsigned flags = _misc_flags & ~fmask;
795 _misc_flags = (flags | (kind << _misc_kind_field_pos));
796 }
797
798 bool is_kind(unsigned desired) const {
799 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
800 return kind == desired;
801 }
802
803 public:
804
805 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
806 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
807 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
808 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
809 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
810
811 #if INCLUDE_JVMTI
812
813 void init_previous_versions() {
814 _previous_versions = NULL;
815 }
816
817 private:
818 static bool _has_previous_versions;
819 public:
820 static void purge_previous_versions(InstanceKlass* ik) {
821 if (ik->has_been_redefined()) {
822 ik->purge_previous_version_list();
823 }
824 }
825
826 static bool has_previous_versions_and_reset();
827 static bool has_previous_versions() { return _has_previous_versions; }
828
829 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
830 void set_cached_class_file(JvmtiCachedClassFileData *data) {
831 _cached_class_file = data;
832 }
833 JvmtiCachedClassFileData * get_cached_class_file();
834 jint get_cached_class_file_len();
835 unsigned char * get_cached_class_file_bytes();
836
837 // JVMTI: Support for caching of field indices, types, and offsets
838 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
839 _jvmti_cached_class_field_map = descriptor;
840 }
841 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
842 return _jvmti_cached_class_field_map;
843 }
844 #else // INCLUDE_JVMTI
845
846 static void purge_previous_versions(InstanceKlass* ik) { return; };
847 static bool has_previous_versions_and_reset() { return false; }
848
849 void set_cached_class_file(JvmtiCachedClassFileData *data) {
850 assert(data == NULL, "unexpected call with JVMTI disabled");
851 }
852 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
853
854 #endif // INCLUDE_JVMTI
855
856 bool has_nonstatic_concrete_methods() const {
857 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
858 }
859 void set_has_nonstatic_concrete_methods(bool b) {
860 if (b) {
861 _misc_flags |= _misc_has_nonstatic_concrete_methods;
862 } else {
863 _misc_flags &= ~_misc_has_nonstatic_concrete_methods;
864 }
865 }
866
867 bool declares_nonstatic_concrete_methods() const {
868 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
869 }
870 void set_declares_nonstatic_concrete_methods(bool b) {
871 if (b) {
872 _misc_flags |= _misc_declares_nonstatic_concrete_methods;
873 } else {
874 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods;
875 }
876 }
877
878 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
879 inline u2 next_method_idnum();
880 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
881
882 // generics support
883 Symbol* generic_signature() const {
884 return (_generic_signature_index == 0) ?
885 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
886 }
887 u2 generic_signature_index() const {
888 return _generic_signature_index;
889 }
890 void set_generic_signature_index(u2 sig_index) {
891 _generic_signature_index = sig_index;
892 }
893
894 u2 enclosing_method_data(int offset) const;
895 u2 enclosing_method_class_index() const {
896 return enclosing_method_data(enclosing_method_class_index_offset);
897 }
898 u2 enclosing_method_method_index() {
899 return enclosing_method_data(enclosing_method_method_index_offset);
900 }
901 void set_enclosing_method_indices(u2 class_index,
902 u2 method_index);
903
904 // jmethodID support
905 jmethodID get_jmethod_id(const methodHandle& method_h);
906 jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
907 jmethodID new_id, jmethodID* new_jmeths,
908 jmethodID* to_dealloc_id_p,
909 jmethodID** to_dealloc_jmeths_p);
910 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
911 size_t *length_p, jmethodID* id_p);
912 void ensure_space_for_methodids(int start_offset = 0);
913 jmethodID jmethod_id_or_null(Method* method);
914
915 // annotations support
916 Annotations* annotations() const { return _annotations; }
917 void set_annotations(Annotations* anno) { _annotations = anno; }
918
919 AnnotationArray* class_annotations() const {
920 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
921 }
922 Array<AnnotationArray*>* fields_annotations() const {
923 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
924 }
925 AnnotationArray* class_type_annotations() const {
926 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
927 }
928 Array<AnnotationArray*>* fields_type_annotations() const {
929 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
930 }
931 // allocation
932 instanceOop allocate_instance(TRAPS);
933
934 // additional member function to return a handle
935 instanceHandle allocate_instance_handle(TRAPS);
936
937 objArrayOop allocate_objArray(int n, int length, TRAPS);
938 // Helper function
939 static instanceOop register_finalizer(instanceOop i, TRAPS);
940
941 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
942 // if not, throw either an Error or an Exception.
943 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
944
945 // initialization
946 void call_class_initializer(TRAPS);
947 void set_initialization_state_and_notify(ClassState state, TRAPS);
948
949 // OopMapCache support
950 OopMapCache* oop_map_cache() { return _oop_map_cache; }
951 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
952 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
953
954 // JNI identifier support (for static fields - for jni performance)
955 JNIid* jni_ids() { return _jni_ids; }
956 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
957 JNIid* jni_id_for(int offset);
958
959 // maintenance of deoptimization dependencies
960 inline DependencyContext dependencies();
961 int mark_dependent_nmethods(KlassDepChange& changes);
962 void add_dependent_nmethod(nmethod* nm);
963 void remove_dependent_nmethod(nmethod* nm);
964 void clean_dependency_context();
965
966 // On-stack replacement support
967 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
968 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
969 void add_osr_nmethod(nmethod* n);
970 bool remove_osr_nmethod(nmethod* n);
971 int mark_osr_nmethods(const Method* m);
972 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
973
974 #if INCLUDE_JVMTI
975 // Breakpoint support (see methods on Method* for details)
976 BreakpointInfo* breakpoints() const { return _breakpoints; };
977 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
978 #endif
979
980 // support for stub routines
981 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
982 JFR_ONLY(DEFINE_KLASS_TRACE_ID_OFFSET;)
983 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
984
985 // subclass/subinterface checks
986 bool implements_interface(Klass* k) const;
987 bool is_same_or_direct_interface(Klass* k) const;
988
989 #ifdef ASSERT
990 // check whether this class or one of its superclasses was redefined
991 bool has_redefined_this_or_super() const;
992 #endif
993
994 // Access to the implementor of an interface.
995 Klass* implementor() const;
996 void set_implementor(Klass* k);
997 int nof_implementors() const;
998 void add_implementor(Klass* k); // k is a new class that implements this interface
999 void init_implementor(); // initialize
1000
1001 // link this class into the implementors list of every interface it implements
1002 void process_interfaces(Thread *thread);
1003
1004 // virtual operations from Klass
1005 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots,
1006 Array<InstanceKlass*>* transitive_interfaces);
1007 bool can_be_primary_super_slow() const;
1008 int oop_size(oop obj) const { return size_helper(); }
1009 // slow because it's a virtual call and used for verifying the layout_helper.
1010 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
1011 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
1012
1013 // Iterators
1014 void do_local_static_fields(FieldClosure* cl);
1015 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
1016 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
1017
1018 void methods_do(void f(Method* method));
1019 void array_klasses_do(void f(Klass* k));
1020 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
1021
1022 static InstanceKlass* cast(Klass* k) {
1023 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
1024 }
1025
1026 static const InstanceKlass* cast(const Klass* k) {
1027 assert(k != NULL, "k should not be null");
1028 assert(k->is_instance_klass(), "cast to InstanceKlass");
1029 return static_cast<const InstanceKlass*>(k);
1030 }
1031
1032 virtual InstanceKlass* java_super() const {
1033 return (super() == NULL) ? NULL : cast(super());
1034 }
1035
1036 // Sizing (in words)
1037 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
1038
1039 static int size(int vtable_length, int itable_length,
1040 int nonstatic_oop_map_size,
1041 bool is_interface, bool is_unsafe_anonymous, bool has_stored_fingerprint) {
1042 return align_metadata_size(header_size() +
1043 vtable_length +
1044 itable_length +
1045 nonstatic_oop_map_size +
1046 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1047 (is_unsafe_anonymous ? (int)sizeof(Klass*)/wordSize : 0) +
1048 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0));
1049 }
1050 int size() const { return size(vtable_length(),
1051 itable_length(),
1052 nonstatic_oop_map_size(),
1053 is_interface(),
1054 is_unsafe_anonymous(),
1055 has_stored_fingerprint());
1056 }
1057 #if INCLUDE_SERVICES
1058 virtual void collect_statistics(KlassSizeStats *sz) const;
1059 #endif
1060
1061 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); }
1062 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
1063
1064 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1065
1066 oop static_field_base_raw() { return java_mirror(); }
1067
1068 OopMapBlock* start_of_nonstatic_oop_maps() const {
1069 return (OopMapBlock*)(start_of_itable() + itable_length());
1070 }
1071
1072 Klass** end_of_nonstatic_oop_maps() const {
1073 return (Klass**)(start_of_nonstatic_oop_maps() +
1074 nonstatic_oop_map_count());
1075 }
1076
1077 Klass* volatile* adr_implementor() const {
1078 if (is_interface()) {
1079 return (Klass* volatile*)end_of_nonstatic_oop_maps();
1080 } else {
1081 return NULL;
1082 }
1083 };
1084
1085 InstanceKlass** adr_unsafe_anonymous_host() const {
1086 if (is_unsafe_anonymous()) {
1087 InstanceKlass** adr_impl = (InstanceKlass**)adr_implementor();
1088 if (adr_impl != NULL) {
1089 return adr_impl + 1;
1090 } else {
1091 return (InstanceKlass **)end_of_nonstatic_oop_maps();
1092 }
1093 } else {
1094 return NULL;
1095 }
1096 }
1097
1098 address adr_fingerprint() const {
1099 if (has_stored_fingerprint()) {
1100 InstanceKlass** adr_host = adr_unsafe_anonymous_host();
1101 if (adr_host != NULL) {
1102 return (address)(adr_host + 1);
1103 }
1104
1105 Klass* volatile* adr_impl = adr_implementor();
1106 if (adr_impl != NULL) {
1107 return (address)(adr_impl + 1);
1108 }
1109
1110 return (address)end_of_nonstatic_oop_maps();
1111 } else {
1112 return NULL;
1113 }
1114 }
1115
1116 // Use this to return the size of an instance in heap words:
1117 int size_helper() const {
1118 return layout_helper_to_size_helper(layout_helper());
1119 }
1120
1121 // This bit is initialized in classFileParser.cpp.
1122 // It is false under any of the following conditions:
1123 // - the class is abstract (including any interface)
1124 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1125 // - the class size is larger than FastAllocateSizeLimit
1126 // - the class is java/lang/Class, which cannot be allocated directly
1127 bool can_be_fastpath_allocated() const {
1128 return !layout_helper_needs_slow_path(layout_helper());
1129 }
1130
1131 // Java itable
1132 klassItable itable() const; // return klassItable wrapper
1133 Method* method_at_itable(Klass* holder, int index, TRAPS);
1134
1135 #if INCLUDE_JVMTI
1136 void adjust_default_methods(bool* trace_name_printed);
1137 #endif // INCLUDE_JVMTI
1138
1139 void clean_weak_instanceklass_links();
1140 private:
1141 void clean_implementors_list();
1142 void clean_method_data();
1143
1144 public:
1145 // Explicit metaspace deallocation of fields
1146 // For RedefineClasses and class file parsing errors, we need to deallocate
1147 // instanceKlasses and the metadata they point to.
1148 void deallocate_contents(ClassLoaderData* loader_data);
1149 static void deallocate_methods(ClassLoaderData* loader_data,
1150 Array<Method*>* methods);
1151 void static deallocate_interfaces(ClassLoaderData* loader_data,
1152 const Klass* super_klass,
1153 Array<InstanceKlass*>* local_interfaces,
1154 Array<InstanceKlass*>* transitive_interfaces);
1155
1156 // The constant pool is on stack if any of the methods are executing or
1157 // referenced by handles.
1158 bool on_stack() const { return _constants->on_stack(); }
1159
1160 // callbacks for actions during class unloading
1161 static void unload_class(InstanceKlass* ik);
1162 static void release_C_heap_structures(InstanceKlass* ik);
1163
1164 // Naming
1165 const char* signature_name() const;
1166 static Symbol* package_from_name(const Symbol* name, TRAPS);
1167
1168 // Oop fields (and metadata) iterators
1169 //
1170 // The InstanceKlass iterators also visits the Object's klass.
1171
1172 // Forward iteration
1173 public:
1174 // Iterate over all oop fields in the oop maps.
1175 template <typename T, class OopClosureType>
1176 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1177
1178 // Iterate over all oop fields and metadata.
1179 template <typename T, class OopClosureType>
1180 inline void oop_oop_iterate(oop obj, OopClosureType* closure);
1181
1182 // Iterate over all oop fields in one oop map.
1183 template <typename T, class OopClosureType>
1184 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1185
1186
1187 // Reverse iteration
1188 // Iterate over all oop fields and metadata.
1189 template <typename T, class OopClosureType>
1190 inline void oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1191
1192 private:
1193 // Iterate over all oop fields in the oop maps.
1194 template <typename T, class OopClosureType>
1195 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1196
1197 // Iterate over all oop fields in one oop map.
1198 template <typename T, class OopClosureType>
1199 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1200
1201
1202 // Bounded range iteration
1203 public:
1204 // Iterate over all oop fields in the oop maps.
1205 template <typename T, class OopClosureType>
1206 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1207
1208 // Iterate over all oop fields and metadata.
1209 template <typename T, class OopClosureType>
1210 inline void oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1211
1212 private:
1213 // Iterate over all oop fields in one oop map.
1214 template <typename T, class OopClosureType>
1215 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1216
1217
1218 public:
1219 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1220
1221 public:
1222 void set_in_error_state() {
1223 assert(DumpSharedSpaces, "only call this when dumping archive");
1224 _init_state = initialization_error;
1225 }
1226 bool check_sharing_error_state();
1227
1228 private:
1229 // initialization state
1230 void set_init_state(ClassState state);
1231 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1232 void set_init_thread(Thread *thread) { _init_thread = thread; }
1233
1234 // The RedefineClasses() API can cause new method idnums to be needed
1235 // which will cause the caches to grow. Safety requires different
1236 // cache management logic if the caches can grow instead of just
1237 // going from NULL to non-NULL.
1238 bool idnum_can_increment() const { return has_been_redefined(); }
1239 inline jmethodID* methods_jmethod_ids_acquire() const;
1240 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1241
1242 // Lock during initialization
1243 public:
1244 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1245 // Must be one per class and it has to be a VM internal object so java code
1246 // cannot lock it (like the mirror).
1247 // It has to be an object not a Mutex because it's held through java calls.
1248 oop init_lock() const;
1249 private:
1250 void fence_and_clear_init_lock();
1251
1252 bool link_class_impl (TRAPS);
1253 bool verify_code (TRAPS);
1254 void initialize_impl (TRAPS);
1255 void initialize_super_interfaces (TRAPS);
1256 void eager_initialize_impl ();
1257 /* jni_id_for_impl for jfieldID only */
1258 JNIid* jni_id_for_impl (int offset);
1259
1260 // Returns the array class for the n'th dimension
1261 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1262
1263 // Returns the array class with this class as element type
1264 Klass* array_klass_impl(bool or_null, TRAPS);
1265
1266 // find a local method (returns NULL if not found)
1267 Method* find_method_impl(const Symbol* name,
1268 const Symbol* signature,
1269 OverpassLookupMode overpass_mode,
1270 StaticLookupMode static_mode,
1271 PrivateLookupMode private_mode) const;
1272
1273 static Method* find_method_impl(const Array<Method*>* methods,
1274 const Symbol* name,
1275 const Symbol* signature,
1276 OverpassLookupMode overpass_mode,
1277 StaticLookupMode static_mode,
1278 PrivateLookupMode private_mode);
1279
1280 // Free CHeap allocated fields.
1281 void release_C_heap_structures();
1282
1283 #if INCLUDE_JVMTI
1284 // RedefineClasses support
1285 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1286 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1287 #endif
1288 public:
1289 // CDS support - remove and restore oops from metadata. Oops are not shared.
1290 virtual void remove_unshareable_info();
1291 virtual void remove_java_mirror();
1292 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1293
1294 // jvm support
1295 jint compute_modifier_flags(TRAPS) const;
1296
1297 public:
1298 // JVMTI support
1299 jint jvmti_class_status() const;
1300
1301 virtual void metaspace_pointers_do(MetaspaceClosure* iter);
1302
1303 public:
1304 // Printing
1305 #ifndef PRODUCT
1306 void print_on(outputStream* st) const;
1307 #endif
1308 void print_value_on(outputStream* st) const;
1309
1310 void oop_print_value_on(oop obj, outputStream* st);
1311
1312 #ifndef PRODUCT
1313 void oop_print_on (oop obj, outputStream* st);
1314
1315 void print_dependent_nmethods(bool verbose = false);
1316 bool is_dependent_nmethod(nmethod* nm);
1317 bool verify_itable_index(int index);
1318 #endif
1319
1320 const char* internal_name() const;
1321
1322 // Verification
1323 void verify_on(outputStream* st);
1324
1325 void oop_verify_on(oop obj, outputStream* st);
1326
1327 // Logging
1328 void print_class_load_logging(ClassLoaderData* loader_data,
1329 const char* module_name,
1330 const ClassFileStream* cfs) const;
1331 };
1332
1333 // for adding methods
1334 // UNSET_IDNUM return means no more ids available
1335 inline u2 InstanceKlass::next_method_idnum() {
1336 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1337 return ConstMethod::UNSET_IDNUM; // no more ids available
1338 } else {
1339 return _idnum_allocated_count++;
1340 }
1341 }
1342
1343
1344 /* JNIid class for jfieldIDs only */
1345 class JNIid: public CHeapObj<mtClass> {
1346 friend class VMStructs;
1347 private:
1348 Klass* _holder;
1349 JNIid* _next;
1350 int _offset;
1351 #ifdef ASSERT
1352 bool _is_static_field_id;
1353 #endif
1354
1355 public:
1356 // Accessors
1357 Klass* holder() const { return _holder; }
1358 int offset() const { return _offset; }
1359 JNIid* next() { return _next; }
1360 // Constructor
1361 JNIid(Klass* holder, int offset, JNIid* next);
1362 // Identifier lookup
1363 JNIid* find(int offset);
1364
1365 bool find_local_field(fieldDescriptor* fd) {
1366 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1367 }
1368
1369 static void deallocate(JNIid* id);
1370 // Debugging
1371 #ifdef ASSERT
1372 bool is_static_field_id() const { return _is_static_field_id; }
1373 void set_is_static_field_id() { _is_static_field_id = true; }
1374 #endif
1375 void verify(Klass* holder);
1376 };
1377
1378 // An iterator that's used to access the inner classes indices in the
1379 // InstanceKlass::_inner_classes array.
1380 class InnerClassesIterator : public StackObj {
1381 private:
1382 Array<jushort>* _inner_classes;
1383 int _length;
1384 int _idx;
1385 public:
1386
1387 InnerClassesIterator(const InstanceKlass* k) {
1388 _inner_classes = k->inner_classes();
1389 if (k->inner_classes() != NULL) {
1390 _length = _inner_classes->length();
1391 // The inner class array's length should be the multiple of
1392 // inner_class_next_offset if it only contains the InnerClasses
1393 // attribute data, or it should be
1394 // n*inner_class_next_offset+enclosing_method_attribute_size
1395 // if it also contains the EnclosingMethod data.
1396 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1397 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1398 "just checking");
1399 // Remove the enclosing_method portion if exists.
1400 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1401 _length -= InstanceKlass::enclosing_method_attribute_size;
1402 }
1403 } else {
1404 _length = 0;
1405 }
1406 _idx = 0;
1407 }
1408
1409 int length() const {
1410 return _length;
1411 }
1412
1413 void next() {
1414 _idx += InstanceKlass::inner_class_next_offset;
1415 }
1416
1417 bool done() const {
1418 return (_idx >= _length);
1419 }
1420
1421 u2 inner_class_info_index() const {
1422 return _inner_classes->at(
1423 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1424 }
1425
1426 void set_inner_class_info_index(u2 index) {
1427 _inner_classes->at_put(
1428 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1429 }
1430
1431 u2 outer_class_info_index() const {
1432 return _inner_classes->at(
1433 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1434 }
1435
1436 void set_outer_class_info_index(u2 index) {
1437 _inner_classes->at_put(
1438 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1439 }
1440
1441 u2 inner_name_index() const {
1442 return _inner_classes->at(
1443 _idx + InstanceKlass::inner_class_inner_name_offset);
1444 }
1445
1446 void set_inner_name_index(u2 index) {
1447 _inner_classes->at_put(
1448 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1449 }
1450
1451 u2 inner_access_flags() const {
1452 return _inner_classes->at(
1453 _idx + InstanceKlass::inner_class_access_flags_offset);
1454 }
1455 };
1456
1457 #endif // SHARE_OOPS_INSTANCEKLASS_HPP