1 /*
2 * Copyright (c) 1997, 2017, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
23 */
24
25 #ifndef SHARE_VM_OOPS_INSTANCEKLASS_HPP
26 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP
27
28 #include "classfile/classLoader.hpp"
29 #include "classfile/classLoaderData.hpp"
30 #include "classfile/moduleEntry.hpp"
31 #include "classfile/packageEntry.hpp"
32 #include "gc/shared/specialized_oop_closures.hpp"
33 #include "logging/logLevel.hpp"
34 #include "memory/referenceType.hpp"
35 #include "oops/annotations.hpp"
36 #include "oops/constMethod.hpp"
37 #include "oops/fieldInfo.hpp"
38 #include "oops/instanceOop.hpp"
39 #include "oops/klassVtable.hpp"
40 #include "runtime/handles.hpp"
41 #include "runtime/os.hpp"
42 #include "trace/traceMacros.hpp"
43 #include "utilities/accessFlags.hpp"
44 #include "utilities/bitMap.inline.hpp"
45 #include "utilities/macros.hpp"
46
47 // An InstanceKlass is the VM level representation of a Java class.
48 // It contains all information needed for at class at execution runtime.
49
50 // InstanceKlass embedded field layout (after declared fields):
51 // [EMBEDDED Java vtable ] size in words = vtable_len
52 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
53 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
54 // indicating where oops are located in instances of this klass.
55 // [EMBEDDED implementor of the interface] only exist for interface
56 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled)
57 // [EMBEDDED fingerprint ] only if should_store_fingerprint()==true
58
59
60 // forward declaration for class -- see below for definition
61 #if INCLUDE_JVMTI
62 class BreakpointInfo;
63 #endif
64 class ClassFileParser;
65 class KlassDepChange;
66 class DependencyContext;
67 class fieldDescriptor;
68 class jniIdMapBase;
69 class JNIid;
70 class JvmtiCachedClassFieldMap;
71 class MemberNameTable;
72 class SuperTypeClosure;
73
74 // This is used in iterators below.
75 class FieldClosure: public StackObj {
76 public:
77 virtual void do_field(fieldDescriptor* fd) = 0;
78 };
79
80 #ifndef PRODUCT
81 // Print fields.
82 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
83 class FieldPrinter: public FieldClosure {
84 oop _obj;
85 outputStream* _st;
86 public:
87 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
88 void do_field(fieldDescriptor* fd);
89 };
90 #endif // !PRODUCT
91
92 // ValueObjs embedded in klass. Describes where oops are located in instances of
93 // this klass.
94 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
95 public:
96 // Byte offset of the first oop mapped by this block.
97 int offset() const { return _offset; }
98 void set_offset(int offset) { _offset = offset; }
99
100 // Number of oops in this block.
101 uint count() const { return _count; }
102 void set_count(uint count) { _count = count; }
103
104 // sizeof(OopMapBlock) in words.
105 static const int size_in_words() {
106 return align_size_up(int(sizeof(OopMapBlock)), wordSize) >>
107 LogBytesPerWord;
108 }
109
110 private:
111 int _offset;
112 uint _count;
113 };
114
115 struct JvmtiCachedClassFileData;
116
117 class InstanceKlass: public Klass {
118 friend class VMStructs;
119 friend class JVMCIVMStructs;
120 friend class ClassFileParser;
121 friend class CompileReplay;
122
123 protected:
124 InstanceKlass(const ClassFileParser& parser, unsigned kind);
125
126 public:
127 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
128
129 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
130 // of the class loading & initialization procedure, and the use of the states.
131 enum ClassState {
132 allocated, // allocated (but not yet linked)
133 loaded, // loaded and inserted in class hierarchy (but not linked yet)
134 linked, // successfully linked/verified (but not initialized yet)
135 being_initialized, // currently running class initializer
136 fully_initialized, // initialized (successfull final state)
137 initialization_error // error happened during initialization
138 };
139
140 static int number_of_instance_classes() { return _total_instanceKlass_count; }
141
142 private:
143 static volatile int _total_instanceKlass_count;
144 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
145
146 protected:
147 // Annotations for this class
148 Annotations* _annotations;
149 // Package this class is defined in
150 PackageEntry* _package_entry;
151 // Array classes holding elements of this class.
152 Klass* volatile _array_klasses;
153 // Constant pool for this class.
154 ConstantPool* _constants;
155 // The InnerClasses attribute and EnclosingMethod attribute. The
156 // _inner_classes is an array of shorts. If the class has InnerClasses
157 // attribute, then the _inner_classes array begins with 4-tuples of shorts
158 // [inner_class_info_index, outer_class_info_index,
159 // inner_name_index, inner_class_access_flags] for the InnerClasses
160 // attribute. If the EnclosingMethod attribute exists, it occupies the
161 // last two shorts [class_index, method_index] of the array. If only
162 // the InnerClasses attribute exists, the _inner_classes array length is
163 // number_of_inner_classes * 4. If the class has both InnerClasses
164 // and EnclosingMethod attributes the _inner_classes array length is
165 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
166 Array<jushort>* _inner_classes;
167
168 // the source debug extension for this klass, NULL if not specified.
169 // Specified as UTF-8 string without terminating zero byte in the classfile,
170 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
171 const char* _source_debug_extension;
172 // Array name derived from this class which needs unreferencing
173 // if this class is unloaded.
174 Symbol* _array_name;
175
176 // Number of heapOopSize words used by non-static fields in this klass
177 // (including inherited fields but after header_size()).
178 int _nonstatic_field_size;
179 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
180 // Constant pool index to the utf8 entry of the Generic signature,
181 // or 0 if none.
182 u2 _generic_signature_index;
183 // Constant pool index to the utf8 entry for the name of source file
184 // containing this klass, 0 if not specified.
185 u2 _source_file_name_index;
186 u2 _static_oop_field_count;// number of static oop fields in this klass
187 u2 _java_fields_count; // The number of declared Java fields
188 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
189
190 int _itable_len; // length of Java itable (in words)
191 // _is_marked_dependent can be set concurrently, thus cannot be part of the
192 // _misc_flags.
193 bool _is_marked_dependent; // used for marking during flushing and deoptimization
194 bool _is_being_redefined; // used for locking redefinition
195
196 // The low two bits of _misc_flags contains the kind field.
197 // This can be used to quickly discriminate among the four kinds of
198 // InstanceKlass.
199
200 static const unsigned _misc_kind_field_size = 2;
201 static const unsigned _misc_kind_field_pos = 0;
202 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
203
204 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
205 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
206 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
207 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
208
209 // Start after _misc_kind field.
210 enum {
211 _misc_rewritten = 1 << 2, // methods rewritten.
212 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops
213 _misc_should_verify_class = 1 << 4, // allow caching of preverification
214 _misc_is_anonymous = 1 << 5, // has embedded _host_klass field
215 _misc_is_contended = 1 << 6, // marked with contended annotation
216 _misc_has_nonstatic_concrete_methods = 1 << 7, // class/superclass/implemented interfaces has non-static, concrete methods
217 _misc_declares_nonstatic_concrete_methods = 1 << 8, // directly declares non-static, concrete methods
218 _misc_has_been_redefined = 1 << 9, // class has been redefined
219 _misc_has_passed_fingerprint_check = 1 << 10, // when this class was loaded, the fingerprint computed from its
220 // code source was found to be matching the value recorded by AOT.
221 _misc_is_scratch_class = 1 << 11, // class is the redefined scratch class
222 _misc_is_shared_boot_class = 1 << 12, // defining class loader is boot class loader
223 _misc_is_shared_platform_class = 1 << 13, // defining class loader is platform class loader
224 _misc_is_shared_app_class = 1 << 14 // defining class loader is app class loader
225 };
226 u2 loader_type_bits() {
227 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
228 }
229 u2 _misc_flags;
230 u2 _minor_version; // minor version number of class file
231 u2 _major_version; // major version number of class file
232 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
233 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
234 MemberNameTable* _member_names; // Member names
235 JNIid* _jni_ids; // First JNI identifier for static fields in this class
236 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
237 intptr_t _dep_context; // packed DependencyContext structure
238 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
239 #if INCLUDE_JVMTI
240 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
241 // Linked instanceKlasses of previous versions
242 InstanceKlass* _previous_versions;
243 // JVMTI fields can be moved to their own structure - see 6315920
244 // JVMTI: cached class file, before retransformable agent modified it in CFLH
245 JvmtiCachedClassFileData* _cached_class_file;
246 #endif
247
248 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
249
250 // Class states are defined as ClassState (see above).
251 // Place the _init_state here to utilize the unused 2-byte after
252 // _idnum_allocated_count.
253 u1 _init_state; // state of class
254 u1 _reference_type; // reference type
255
256 #if INCLUDE_JVMTI
257 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
258 #endif
259
260 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
261
262 // Method array.
263 Array<Method*>* _methods;
264 // Default Method Array, concrete methods inherited from interfaces
265 Array<Method*>* _default_methods;
266 // Interface (Klass*s) this class declares locally to implement.
267 Array<Klass*>* _local_interfaces;
268 // Interface (Klass*s) this class implements transitively.
269 Array<Klass*>* _transitive_interfaces;
270 // Int array containing the original order of method in the class file (for JVMTI).
271 Array<int>* _method_ordering;
272 // Int array containing the vtable_indices for default_methods
273 // offset matches _default_methods offset
274 Array<int>* _default_vtable_indices;
275
276 // Instance and static variable information, starts with 6-tuples of shorts
277 // [access, name index, sig index, initval index, low_offset, high_offset]
278 // for all fields, followed by the generic signature data at the end of
279 // the array. Only fields with generic signature attributes have the generic
280 // signature data set in the array. The fields array looks like following:
281 //
282 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
283 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
284 // ...
285 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
286 // [generic signature index]
287 // [generic signature index]
288 // ...
289 Array<u2>* _fields;
290
291 // embedded Java vtable follows here
292 // embedded Java itables follows here
293 // embedded static fields follows here
294 // embedded nonstatic oop-map blocks follows here
295 // embedded implementor of this interface follows here
296 // The embedded implementor only exists if the current klass is an
297 // iterface. The possible values of the implementor fall into following
298 // three cases:
299 // NULL: no implementor.
300 // A Klass* that's not itself: one implementor.
301 // Itself: more than one implementors.
302 // embedded host klass follows here
303 // The embedded host klass only exists in an anonymous class for
304 // dynamic language support (JSR 292 enabled). The host class grants
305 // its access privileges to this class also. The host class is either
306 // named, or a previously loaded anonymous class. A non-anonymous class
307 // or an anonymous class loaded through normal classloading does not
308 // have this embedded field.
309 //
310
311 friend class SystemDictionary;
312
313 public:
314 u2 loader_type() {
315 return _misc_flags & loader_type_bits();
316 }
317
318 bool is_shared_boot_class() const {
319 return (_misc_flags & _misc_is_shared_boot_class) != 0;
320 }
321 bool is_shared_platform_class() const {
322 return (_misc_flags & _misc_is_shared_platform_class) != 0;
323 }
324 bool is_shared_app_class() const {
325 return (_misc_flags & _misc_is_shared_app_class) != 0;
326 }
327
328 void set_class_loader_type(s2 loader_type) {
329 assert(( _misc_flags & loader_type_bits()) == 0,
330 "Should only be called once for each class.");
331 switch (loader_type) {
332 case ClassLoader::BOOT_LOADER:
333 _misc_flags |= _misc_is_shared_boot_class;
334 break;
335 case ClassLoader::PLATFORM_LOADER:
336 _misc_flags |= _misc_is_shared_platform_class;
337 break;
338 case ClassLoader::APP_LOADER:
339 _misc_flags |= _misc_is_shared_app_class;
340 break;
341 default:
342 ShouldNotReachHere();
343 break;
344 }
345 }
346
347 bool has_nonstatic_fields() const {
348 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
349 }
350 void set_has_nonstatic_fields(bool b) {
351 if (b) {
352 _misc_flags |= _misc_has_nonstatic_fields;
353 } else {
354 _misc_flags &= ~_misc_has_nonstatic_fields;
355 }
356 }
357
358 // field sizes
359 int nonstatic_field_size() const { return _nonstatic_field_size; }
360 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
361
362 int static_field_size() const { return _static_field_size; }
363 void set_static_field_size(int size) { _static_field_size = size; }
364
365 int static_oop_field_count() const { return (int)_static_oop_field_count; }
366 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
367
368 // Java itable
369 int itable_length() const { return _itable_len; }
370 void set_itable_length(int len) { _itable_len = len; }
371
372 // array klasses
373 Klass* array_klasses() const { return _array_klasses; }
374 inline Klass* array_klasses_acquire() const; // load with acquire semantics
375 void set_array_klasses(Klass* k) { _array_klasses = k; }
376 inline void release_set_array_klasses(Klass* k); // store with release semantics
377
378 // methods
379 Array<Method*>* methods() const { return _methods; }
380 void set_methods(Array<Method*>* a) { _methods = a; }
381 Method* method_with_idnum(int idnum);
382 Method* method_with_orig_idnum(int idnum);
383 Method* method_with_orig_idnum(int idnum, int version);
384
385 // method ordering
386 Array<int>* method_ordering() const { return _method_ordering; }
387 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
388 void copy_method_ordering(const intArray* m, TRAPS);
389
390 // default_methods
391 Array<Method*>* default_methods() const { return _default_methods; }
392 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
393
394 // default method vtable_indices
395 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
396 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
397 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
398
399 // interfaces
400 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
401 void set_local_interfaces(Array<Klass*>* a) {
402 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
403 _local_interfaces = a; }
404
405 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
406 void set_transitive_interfaces(Array<Klass*>* a) {
407 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
408 _transitive_interfaces = a;
409 }
410
411 private:
412 friend class fieldDescriptor;
413 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
414
415 public:
416 int field_offset (int index) const { return field(index)->offset(); }
417 int field_access_flags(int index) const { return field(index)->access_flags(); }
418 Symbol* field_name (int index) const { return field(index)->name(constants()); }
419 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
420
421 // Number of Java declared fields
422 int java_fields_count() const { return (int)_java_fields_count; }
423
424 Array<u2>* fields() const { return _fields; }
425 void set_fields(Array<u2>* f, u2 java_fields_count) {
426 guarantee(_fields == NULL || f == NULL, "Just checking");
427 _fields = f;
428 _java_fields_count = java_fields_count;
429 }
430
431 // inner classes
432 Array<u2>* inner_classes() const { return _inner_classes; }
433 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
434
435 enum InnerClassAttributeOffset {
436 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
437 inner_class_inner_class_info_offset = 0,
438 inner_class_outer_class_info_offset = 1,
439 inner_class_inner_name_offset = 2,
440 inner_class_access_flags_offset = 3,
441 inner_class_next_offset = 4
442 };
443
444 enum EnclosingMethodAttributeOffset {
445 enclosing_method_class_index_offset = 0,
446 enclosing_method_method_index_offset = 1,
447 enclosing_method_attribute_size = 2
448 };
449
450 // method override check
451 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
452
453 // package
454 PackageEntry* package() const { return _package_entry; }
455 ModuleEntry* module() const;
456 bool in_unnamed_package() const { return (_package_entry == NULL); }
457 void set_package(PackageEntry* p) { _package_entry = p; }
458 void set_package(ClassLoaderData* loader_data, TRAPS);
459 bool is_same_class_package(const Klass* class2) const;
460 bool is_same_class_package(oop classloader2, const Symbol* classname2) const;
461 static bool is_same_class_package(oop class_loader1,
462 const Symbol* class_name1,
463 oop class_loader2,
464 const Symbol* class_name2);
465
466 // find an enclosing class
467 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
468
469 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
470 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
471
472 private:
473 // Check prohibited package ("java/" only loadable by boot or platform loaders)
474 static void check_prohibited_package(Symbol* class_name,
475 Handle class_loader,
476 TRAPS);
477 public:
478 // tell if two classes have the same enclosing class (at package level)
479 bool is_same_package_member(const Klass* class2, TRAPS) const;
480
481 // initialization state
482 bool is_loaded() const { return _init_state >= loaded; }
483 bool is_linked() const { return _init_state >= linked; }
484 bool is_initialized() const { return _init_state == fully_initialized; }
485 bool is_not_initialized() const { return _init_state < being_initialized; }
486 bool is_being_initialized() const { return _init_state == being_initialized; }
487 bool is_in_error_state() const { return _init_state == initialization_error; }
488 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
489 ClassState init_state() { return (ClassState)_init_state; }
490 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
491
492 // defineClass specified verification
493 bool should_verify_class() const {
494 return (_misc_flags & _misc_should_verify_class) != 0;
495 }
496 void set_should_verify_class(bool value) {
497 if (value) {
498 _misc_flags |= _misc_should_verify_class;
499 } else {
500 _misc_flags &= ~_misc_should_verify_class;
501 }
502 }
503
504 // marking
505 bool is_marked_dependent() const { return _is_marked_dependent; }
506 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
507
508 // initialization (virtuals from Klass)
509 bool should_be_initialized() const; // means that initialize should be called
510 void initialize(TRAPS);
511 void link_class(TRAPS);
512 bool link_class_or_fail(TRAPS); // returns false on failure
513 void unlink_class();
514 void rewrite_class(TRAPS);
515 void link_methods(TRAPS);
516 Method* class_initializer() const;
517
518 // set the class to initialized if no static initializer is present
519 void eager_initialize(Thread *thread);
520
521 // reference type
522 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
523 void set_reference_type(ReferenceType t) {
524 assert(t == (u1)t, "overflow");
525 _reference_type = (u1)t;
526 }
527
528 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
529
530 // find local field, returns true if found
531 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
532 // find field in direct superinterfaces, returns the interface in which the field is defined
533 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
534 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
535 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
536 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
537 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
538
539 // find a non-static or static field given its offset within the class.
540 bool contains_field_offset(int offset) {
541 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
542 }
543
544 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
545 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
546
547 // find a local method (returns NULL if not found)
548 Method* find_method(const Symbol* name, const Symbol* signature) const;
549 static Method* find_method(const Array<Method*>* methods,
550 const Symbol* name,
551 const Symbol* signature);
552
553 // find a local method, but skip static methods
554 Method* find_instance_method(const Symbol* name, const Symbol* signature) const;
555 static Method* find_instance_method(const Array<Method*>* methods,
556 const Symbol* name,
557 const Symbol* signature);
558
559 // find a local method (returns NULL if not found)
560 Method* find_local_method(const Symbol* name,
561 const Symbol* signature,
562 OverpassLookupMode overpass_mode,
563 StaticLookupMode static_mode,
564 PrivateLookupMode private_mode) const;
565
566 // find a local method from given methods array (returns NULL if not found)
567 static Method* find_local_method(const Array<Method*>* methods,
568 const Symbol* name,
569 const Symbol* signature,
570 OverpassLookupMode overpass_mode,
571 StaticLookupMode static_mode,
572 PrivateLookupMode private_mode);
573
574 // find a local method index in methods or default_methods (returns -1 if not found)
575 static int find_method_index(const Array<Method*>* methods,
576 const Symbol* name,
577 const Symbol* signature,
578 OverpassLookupMode overpass_mode,
579 StaticLookupMode static_mode,
580 PrivateLookupMode private_mode);
581
582 // lookup operation (returns NULL if not found)
583 Method* uncached_lookup_method(const Symbol* name,
584 const Symbol* signature,
585 OverpassLookupMode overpass_mode) const;
586
587 // lookup a method in all the interfaces that this class implements
588 // (returns NULL if not found)
589 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
590
591 // lookup a method in local defaults then in all interfaces
592 // (returns NULL if not found)
593 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
594
595 // Find method indices by name. If a method with the specified name is
596 // found the index to the first method is returned, and 'end' is filled in
597 // with the index of first non-name-matching method. If no method is found
598 // -1 is returned.
599 int find_method_by_name(const Symbol* name, int* end) const;
600 static int find_method_by_name(const Array<Method*>* methods,
601 const Symbol* name, int* end);
602
603 // constant pool
604 ConstantPool* constants() const { return _constants; }
605 void set_constants(ConstantPool* c) { _constants = c; }
606
607 // protection domain
608 oop protection_domain() const;
609
610 // signers
611 objArrayOop signers() const;
612
613 // host class
614 InstanceKlass* host_klass() const {
615 InstanceKlass** hk = adr_host_klass();
616 if (hk == NULL) {
617 return NULL;
618 } else {
619 assert(*hk != NULL, "host klass should always be set if the address is not null");
620 return *hk;
621 }
622 }
623 void set_host_klass(const InstanceKlass* host) {
624 assert(is_anonymous(), "not anonymous");
625 const InstanceKlass** addr = (const InstanceKlass **)adr_host_klass();
626 assert(addr != NULL, "no reversed space");
627 if (addr != NULL) {
628 *addr = host;
629 }
630 }
631 bool is_anonymous() const {
632 return (_misc_flags & _misc_is_anonymous) != 0;
633 }
634 void set_is_anonymous(bool value) {
635 if (value) {
636 _misc_flags |= _misc_is_anonymous;
637 } else {
638 _misc_flags &= ~_misc_is_anonymous;
639 }
640 }
641
642 // Oop that keeps the metadata for this class from being unloaded
643 // in places where the metadata is stored in other places, like nmethods
644 oop* klass_holder_addr() const;
645
646 bool is_contended() const {
647 return (_misc_flags & _misc_is_contended) != 0;
648 }
649 void set_is_contended(bool value) {
650 if (value) {
651 _misc_flags |= _misc_is_contended;
652 } else {
653 _misc_flags &= ~_misc_is_contended;
654 }
655 }
656
657 // source file name
658 Symbol* source_file_name() const {
659 return (_source_file_name_index == 0) ?
660 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
661 }
662 u2 source_file_name_index() const {
663 return _source_file_name_index;
664 }
665 void set_source_file_name_index(u2 sourcefile_index) {
666 _source_file_name_index = sourcefile_index;
667 }
668
669 // minor and major version numbers of class file
670 u2 minor_version() const { return _minor_version; }
671 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
672 u2 major_version() const { return _major_version; }
673 void set_major_version(u2 major_version) { _major_version = major_version; }
674
675 // source debug extension
676 const char* source_debug_extension() const { return _source_debug_extension; }
677 void set_source_debug_extension(const char* array, int length);
678
679 // symbol unloading support (refcount already added)
680 Symbol* array_name() { return _array_name; }
681 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
682
683 // nonstatic oop-map blocks
684 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
685 return oop_map_count * OopMapBlock::size_in_words();
686 }
687 unsigned int nonstatic_oop_map_count() const {
688 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
689 }
690 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
691 void set_nonstatic_oop_map_size(int words) {
692 _nonstatic_oop_map_size = words;
693 }
694
695 #if INCLUDE_JVMTI
696 // Redefinition locking. Class can only be redefined by one thread at a time.
697 bool is_being_redefined() const { return _is_being_redefined; }
698 void set_is_being_redefined(bool value) { _is_being_redefined = value; }
699
700 // RedefineClasses() support for previous versions:
701 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
702 void purge_previous_version_list();
703
704 InstanceKlass* previous_versions() const { return _previous_versions; }
705 #else
706 InstanceKlass* previous_versions() const { return NULL; }
707 #endif
708
709 InstanceKlass* get_klass_version(int version) {
710 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
711 if (ik->constants()->version() == version) {
712 return ik;
713 }
714 }
715 return NULL;
716 }
717
718 bool has_been_redefined() const {
719 return (_misc_flags & _misc_has_been_redefined) != 0;
720 }
721 void set_has_been_redefined() {
722 _misc_flags |= _misc_has_been_redefined;
723 }
724
725 bool has_passed_fingerprint_check() const {
726 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0;
727 }
728 void set_has_passed_fingerprint_check(bool b) {
729 if (b) {
730 _misc_flags |= _misc_has_passed_fingerprint_check;
731 } else {
732 _misc_flags &= ~_misc_has_passed_fingerprint_check;
733 }
734 }
735 bool supers_have_passed_fingerprint_checks();
736
737 static bool should_store_fingerprint();
738 bool has_stored_fingerprint() const;
739 uint64_t get_stored_fingerprint() const;
740 void store_fingerprint(uint64_t fingerprint);
741
742 bool is_scratch_class() const {
743 return (_misc_flags & _misc_is_scratch_class) != 0;
744 }
745
746 void set_is_scratch_class() {
747 _misc_flags |= _misc_is_scratch_class;
748 }
749
750 private:
751
752 void set_kind(unsigned kind) {
753 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
754 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
755 unsigned flags = _misc_flags & ~fmask;
756 _misc_flags = (flags | (kind << _misc_kind_field_pos));
757 }
758
759 bool is_kind(unsigned desired) const {
760 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
761 return kind == desired;
762 }
763
764 public:
765
766 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
767 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
768 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
769 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
770 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
771
772 #if INCLUDE_JVMTI
773
774 void init_previous_versions() {
775 _previous_versions = NULL;
776 }
777
778 private:
779 static bool _has_previous_versions;
780 public:
781 static void purge_previous_versions(InstanceKlass* ik) {
782 if (ik->has_been_redefined()) {
783 ik->purge_previous_version_list();
784 }
785 }
786
787 static bool has_previous_versions_and_reset();
788
789 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
790 void set_cached_class_file(JvmtiCachedClassFileData *data) {
791 _cached_class_file = data;
792 }
793 JvmtiCachedClassFileData * get_cached_class_file();
794 jint get_cached_class_file_len();
795 unsigned char * get_cached_class_file_bytes();
796
797 // JVMTI: Support for caching of field indices, types, and offsets
798 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
799 _jvmti_cached_class_field_map = descriptor;
800 }
801 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
802 return _jvmti_cached_class_field_map;
803 }
804
805 #if INCLUDE_CDS
806 void set_archived_class_data(JvmtiCachedClassFileData* data) {
807 _cached_class_file = data;
808 }
809
810 JvmtiCachedClassFileData * get_archived_class_data();
811 #endif // INCLUDE_CDS
812 #else // INCLUDE_JVMTI
813
814 static void purge_previous_versions(InstanceKlass* ik) { return; };
815 static bool has_previous_versions_and_reset() { return false; }
816
817 void set_cached_class_file(JvmtiCachedClassFileData *data) {
818 assert(data == NULL, "unexpected call with JVMTI disabled");
819 }
820 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
821
822 #endif // INCLUDE_JVMTI
823
824 bool has_nonstatic_concrete_methods() const {
825 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
826 }
827 void set_has_nonstatic_concrete_methods(bool b) {
828 if (b) {
829 _misc_flags |= _misc_has_nonstatic_concrete_methods;
830 } else {
831 _misc_flags &= ~_misc_has_nonstatic_concrete_methods;
832 }
833 }
834
835 bool declares_nonstatic_concrete_methods() const {
836 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
837 }
838 void set_declares_nonstatic_concrete_methods(bool b) {
839 if (b) {
840 _misc_flags |= _misc_declares_nonstatic_concrete_methods;
841 } else {
842 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods;
843 }
844 }
845
846 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
847 inline u2 next_method_idnum();
848 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
849
850 // generics support
851 Symbol* generic_signature() const {
852 return (_generic_signature_index == 0) ?
853 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
854 }
855 u2 generic_signature_index() const {
856 return _generic_signature_index;
857 }
858 void set_generic_signature_index(u2 sig_index) {
859 _generic_signature_index = sig_index;
860 }
861
862 u2 enclosing_method_data(int offset) const;
863 u2 enclosing_method_class_index() const {
864 return enclosing_method_data(enclosing_method_class_index_offset);
865 }
866 u2 enclosing_method_method_index() {
867 return enclosing_method_data(enclosing_method_method_index_offset);
868 }
869 void set_enclosing_method_indices(u2 class_index,
870 u2 method_index);
871
872 // jmethodID support
873 jmethodID get_jmethod_id(const methodHandle& method_h);
874 jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
875 jmethodID new_id, jmethodID* new_jmeths,
876 jmethodID* to_dealloc_id_p,
877 jmethodID** to_dealloc_jmeths_p);
878 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
879 size_t *length_p, jmethodID* id_p);
880 void ensure_space_for_methodids(int start_offset = 0);
881 jmethodID jmethod_id_or_null(Method* method);
882
883 // annotations support
884 Annotations* annotations() const { return _annotations; }
885 void set_annotations(Annotations* anno) { _annotations = anno; }
886
887 AnnotationArray* class_annotations() const {
888 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
889 }
890 Array<AnnotationArray*>* fields_annotations() const {
891 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
892 }
893 AnnotationArray* class_type_annotations() const {
894 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
895 }
896 Array<AnnotationArray*>* fields_type_annotations() const {
897 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
898 }
899 // allocation
900 instanceOop allocate_instance(TRAPS);
901
902 // additional member function to return a handle
903 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
904
905 objArrayOop allocate_objArray(int n, int length, TRAPS);
906 // Helper function
907 static instanceOop register_finalizer(instanceOop i, TRAPS);
908
909 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
910 // if not, throw either an Error or an Exception.
911 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
912
913 // initialization
914 void call_class_initializer(TRAPS);
915 void set_initialization_state_and_notify(ClassState state, TRAPS);
916
917 // OopMapCache support
918 OopMapCache* oop_map_cache() { return _oop_map_cache; }
919 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
920 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
921
922 // JNI identifier support (for static fields - for jni performance)
923 JNIid* jni_ids() { return _jni_ids; }
924 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
925 JNIid* jni_id_for(int offset);
926
927 // maintenance of deoptimization dependencies
928 inline DependencyContext dependencies();
929 int mark_dependent_nmethods(KlassDepChange& changes);
930 void add_dependent_nmethod(nmethod* nm);
931 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
932
933 // On-stack replacement support
934 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
935 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
936 void add_osr_nmethod(nmethod* n);
937 bool remove_osr_nmethod(nmethod* n);
938 int mark_osr_nmethods(const Method* m);
939 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
940
941 #if INCLUDE_JVMTI
942 // Breakpoint support (see methods on Method* for details)
943 BreakpointInfo* breakpoints() const { return _breakpoints; };
944 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
945 #endif
946
947 // support for stub routines
948 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
949 TRACE_DEFINE_KLASS_TRACE_ID_OFFSET;
950 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
951
952 // subclass/subinterface checks
953 bool implements_interface(Klass* k) const;
954 bool is_same_or_direct_interface(Klass* k) const;
955
956 #ifdef ASSERT
957 // check whether this class or one of its superclasses was redefined
958 bool has_redefined_this_or_super() const;
959 #endif
960
961 // Access to the implementor of an interface.
962 Klass* implementor() const
963 {
964 Klass** k = adr_implementor();
965 if (k == NULL) {
966 return NULL;
967 } else {
968 return *k;
969 }
970 }
971
972 void set_implementor(Klass* k) {
973 assert(is_interface(), "not interface");
974 Klass** addr = adr_implementor();
975 assert(addr != NULL, "null addr");
976 if (addr != NULL) {
977 *addr = k;
978 }
979 }
980
981 int nof_implementors() const {
982 Klass* k = implementor();
983 if (k == NULL) {
984 return 0;
985 } else if (k != this) {
986 return 1;
987 } else {
988 return 2;
989 }
990 }
991
992 void add_implementor(Klass* k); // k is a new class that implements this interface
993 void init_implementor(); // initialize
994
995 // link this class into the implementors list of every interface it implements
996 void process_interfaces(Thread *thread);
997
998 // virtual operations from Klass
999 bool is_leaf_class() const { return _subklass == NULL; }
1000 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
1001 bool compute_is_subtype_of(Klass* k);
1002 bool can_be_primary_super_slow() const;
1003 int oop_size(oop obj) const { return size_helper(); }
1004 // slow because it's a virtual call and used for verifying the layout_helper.
1005 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
1006 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
1007
1008 // Iterators
1009 void do_local_static_fields(FieldClosure* cl);
1010 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
1011 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
1012
1013 void methods_do(void f(Method* method));
1014 void array_klasses_do(void f(Klass* k));
1015 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
1016 bool super_types_do(SuperTypeClosure* blk);
1017
1018 static InstanceKlass* cast(Klass* k) {
1019 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
1020 }
1021
1022 static const InstanceKlass* cast(const Klass* k) {
1023 assert(k != NULL, "k should not be null");
1024 assert(k->is_instance_klass(), "cast to InstanceKlass");
1025 return static_cast<const InstanceKlass*>(k);
1026 }
1027
1028 InstanceKlass* java_super() const {
1029 return (super() == NULL) ? NULL : cast(super());
1030 }
1031
1032 // Sizing (in words)
1033 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
1034
1035 static int size(int vtable_length, int itable_length,
1036 int nonstatic_oop_map_size,
1037 bool is_interface, bool is_anonymous, bool has_stored_fingerprint) {
1038 return align_metadata_size(header_size() +
1039 vtable_length +
1040 itable_length +
1041 nonstatic_oop_map_size +
1042 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1043 (is_anonymous ? (int)sizeof(Klass*)/wordSize : 0) +
1044 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0));
1045 }
1046 int size() const { return size(vtable_length(),
1047 itable_length(),
1048 nonstatic_oop_map_size(),
1049 is_interface(),
1050 is_anonymous(),
1051 has_stored_fingerprint());
1052 }
1053 #if INCLUDE_SERVICES
1054 virtual void collect_statistics(KlassSizeStats *sz) const;
1055 #endif
1056
1057 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); }
1058 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
1059
1060 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1061
1062 address static_field_addr(int offset);
1063
1064 OopMapBlock* start_of_nonstatic_oop_maps() const {
1065 return (OopMapBlock*)(start_of_itable() + itable_length());
1066 }
1067
1068 Klass** end_of_nonstatic_oop_maps() const {
1069 return (Klass**)(start_of_nonstatic_oop_maps() +
1070 nonstatic_oop_map_count());
1071 }
1072
1073 Klass** adr_implementor() const {
1074 if (is_interface()) {
1075 return (Klass**)end_of_nonstatic_oop_maps();
1076 } else {
1077 return NULL;
1078 }
1079 };
1080
1081 InstanceKlass** adr_host_klass() const {
1082 if (is_anonymous()) {
1083 InstanceKlass** adr_impl = (InstanceKlass **)adr_implementor();
1084 if (adr_impl != NULL) {
1085 return adr_impl + 1;
1086 } else {
1087 return (InstanceKlass **)end_of_nonstatic_oop_maps();
1088 }
1089 } else {
1090 return NULL;
1091 }
1092 }
1093
1094 address adr_fingerprint() const {
1095 if (has_stored_fingerprint()) {
1096 InstanceKlass** adr_host = adr_host_klass();
1097 if (adr_host != NULL) {
1098 return (address)(adr_host + 1);
1099 }
1100
1101 Klass** adr_impl = adr_implementor();
1102 if (adr_impl != NULL) {
1103 return (address)(adr_impl + 1);
1104 }
1105
1106 return (address)end_of_nonstatic_oop_maps();
1107 } else {
1108 return NULL;
1109 }
1110 }
1111
1112 // Use this to return the size of an instance in heap words:
1113 int size_helper() const {
1114 return layout_helper_to_size_helper(layout_helper());
1115 }
1116
1117 // This bit is initialized in classFileParser.cpp.
1118 // It is false under any of the following conditions:
1119 // - the class is abstract (including any interface)
1120 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1121 // - the class size is larger than FastAllocateSizeLimit
1122 // - the class is java/lang/Class, which cannot be allocated directly
1123 bool can_be_fastpath_allocated() const {
1124 return !layout_helper_needs_slow_path(layout_helper());
1125 }
1126
1127 // Java itable
1128 klassItable itable() const; // return klassItable wrapper
1129 Method* method_at_itable(Klass* holder, int index, TRAPS);
1130
1131 #if INCLUDE_JVMTI
1132 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1133 #endif // INCLUDE_JVMTI
1134
1135 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1136 void clean_implementors_list(BoolObjectClosure* is_alive);
1137 void clean_method_data(BoolObjectClosure* is_alive);
1138
1139 // Explicit metaspace deallocation of fields
1140 // For RedefineClasses and class file parsing errors, we need to deallocate
1141 // instanceKlasses and the metadata they point to.
1142 void deallocate_contents(ClassLoaderData* loader_data);
1143 static void deallocate_methods(ClassLoaderData* loader_data,
1144 Array<Method*>* methods);
1145 void static deallocate_interfaces(ClassLoaderData* loader_data,
1146 const Klass* super_klass,
1147 Array<Klass*>* local_interfaces,
1148 Array<Klass*>* transitive_interfaces);
1149
1150 // The constant pool is on stack if any of the methods are executing or
1151 // referenced by handles.
1152 bool on_stack() const { return _constants->on_stack(); }
1153
1154 // callbacks for actions during class unloading
1155 static void notify_unload_class(InstanceKlass* ik);
1156 static void release_C_heap_structures(InstanceKlass* ik);
1157
1158 // Naming
1159 const char* signature_name() const;
1160 static Symbol* package_from_name(const Symbol* name, TRAPS);
1161
1162 // GC specific object visitors
1163 //
1164 // Mark Sweep
1165 int oop_ms_adjust_pointers(oop obj);
1166 #if INCLUDE_ALL_GCS
1167 // Parallel Scavenge
1168 void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
1169 // Parallel Compact
1170 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
1171 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm);
1172 #endif
1173
1174 // Oop fields (and metadata) iterators
1175 // [nv = true] Use non-virtual calls to do_oop_nv.
1176 // [nv = false] Use virtual calls to do_oop.
1177 //
1178 // The InstanceKlass iterators also visits the Object's klass.
1179
1180 // Forward iteration
1181 public:
1182 // Iterate over all oop fields in the oop maps.
1183 template <bool nv, class OopClosureType>
1184 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1185
1186 protected:
1187 // Iterate over all oop fields and metadata.
1188 template <bool nv, class OopClosureType>
1189 inline int oop_oop_iterate(oop obj, OopClosureType* closure);
1190
1191 private:
1192 // Iterate over all oop fields in the oop maps.
1193 // Specialized for [T = oop] or [T = narrowOop].
1194 template <bool nv, typename T, class OopClosureType>
1195 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure);
1196
1197 // Iterate over all oop fields in one oop map.
1198 template <bool nv, typename T, class OopClosureType>
1199 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1200
1201
1202 // Reverse iteration
1203 #if INCLUDE_ALL_GCS
1204 public:
1205 // Iterate over all oop fields in the oop maps.
1206 template <bool nv, class OopClosureType>
1207 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1208
1209 protected:
1210 // Iterate over all oop fields and metadata.
1211 template <bool nv, class OopClosureType>
1212 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1213
1214 private:
1215 // Iterate over all oop fields in the oop maps.
1216 // Specialized for [T = oop] or [T = narrowOop].
1217 template <bool nv, typename T, class OopClosureType>
1218 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure);
1219
1220 // Iterate over all oop fields in one oop map.
1221 template <bool nv, typename T, class OopClosureType>
1222 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1223 #endif
1224
1225
1226 // Bounded range iteration
1227 public:
1228 // Iterate over all oop fields in the oop maps.
1229 template <bool nv, class OopClosureType>
1230 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1231
1232 protected:
1233 // Iterate over all oop fields and metadata.
1234 template <bool nv, class OopClosureType>
1235 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1236
1237 private:
1238 // Iterate over all oop fields in the oop maps.
1239 // Specialized for [T = oop] or [T = narrowOop].
1240 template <bool nv, typename T, class OopClosureType>
1241 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1242
1243 // Iterate over all oop fields in one oop map.
1244 template <bool nv, typename T, class OopClosureType>
1245 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1246
1247
1248 public:
1249
1250 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
1251 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
1252
1253 #if INCLUDE_ALL_GCS
1254 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
1255 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
1256 #endif // INCLUDE_ALL_GCS
1257
1258 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1259
1260 public:
1261 void set_in_error_state() {
1262 assert(DumpSharedSpaces, "only call this when dumping archive");
1263 _init_state = initialization_error;
1264 }
1265 bool check_sharing_error_state();
1266
1267 private:
1268 // initialization state
1269 #ifdef ASSERT
1270 void set_init_state(ClassState state);
1271 #else
1272 void set_init_state(ClassState state) { _init_state = (u1)state; }
1273 #endif
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 (bool throw_verifyerror, TRAPS);
1296 bool verify_code (bool throw_verifyerror, 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 restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1335
1336 // jvm support
1337 jint compute_modifier_flags(TRAPS) const;
1338
1339 // JSR-292 support
1340 MemberNameTable* member_names() { return _member_names; }
1341 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; }
1342 oop add_member_name(Handle member_name, bool intern);
1343
1344 public:
1345 // JVMTI support
1346 jint jvmti_class_status() const;
1347
1348 public:
1349 // Printing
1350 #ifndef PRODUCT
1351 void print_on(outputStream* st) const;
1352 #endif
1353 void print_value_on(outputStream* st) const;
1354
1355 void oop_print_value_on(oop obj, outputStream* st);
1356
1357 #ifndef PRODUCT
1358 void oop_print_on (oop obj, outputStream* st);
1359
1360 void print_dependent_nmethods(bool verbose = false);
1361 bool is_dependent_nmethod(nmethod* nm);
1362 #endif
1363
1364 const char* internal_name() const;
1365
1366 // Verification
1367 void verify_on(outputStream* st);
1368
1369 void oop_verify_on(oop obj, outputStream* st);
1370
1371 // Logging
1372 void print_loading_log(LogLevel::type type, ClassLoaderData* loader_data,
1373 const char* module_name, 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_VM_OOPS_INSTANCEKLASS_HPP