1 /*
2 * Copyright (c) 1997, 2016, 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
58
59 // forward declaration for class -- see below for definition
60 #if INCLUDE_JVMTI
61 class BreakpointInfo;
62 #endif
63 class ClassFileParser;
64 class KlassDepChange;
65 class DependencyContext;
66 class fieldDescriptor;
67 class jniIdMapBase;
68 class JNIid;
69 class JvmtiCachedClassFieldMap;
70 class MemberNameTable;
71 class SuperTypeClosure;
72
73 // This is used in iterators below.
74 class FieldClosure: public StackObj {
75 public:
76 virtual void do_field(fieldDescriptor* fd) = 0;
77 };
78
79 #ifndef PRODUCT
80 // Print fields.
81 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
82 class FieldPrinter: public FieldClosure {
83 oop _obj;
84 outputStream* _st;
85 public:
86 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
87 void do_field(fieldDescriptor* fd);
88 };
89 #endif // !PRODUCT
90
91 // ValueObjs embedded in klass. Describes where oops are located in instances of
92 // this klass.
93 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
94 public:
95 // Byte offset of the first oop mapped by this block.
96 int offset() const { return _offset; }
97 void set_offset(int offset) { _offset = offset; }
98
99 // Number of oops in this block.
100 uint count() const { return _count; }
101 void set_count(uint count) { _count = count; }
102
103 // sizeof(OopMapBlock) in words.
104 static const int size_in_words() {
105 return align_size_up(int(sizeof(OopMapBlock)), wordSize) >>
106 LogBytesPerWord;
107 }
108
109 private:
110 int _offset;
111 uint _count;
112 };
113
114 struct JvmtiCachedClassFileData;
115
116 class InstanceKlass: public Klass {
117 friend class VMStructs;
118 friend class JVMCIVMStructs;
119 friend class ClassFileParser;
120 friend class CompileReplay;
121
122 protected:
123 InstanceKlass(const ClassFileParser& parser, unsigned kind);
124
125 public:
126 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
127
128 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
129 // of the class loading & initialization procedure, and the use of the states.
130 enum ClassState {
131 allocated, // allocated (but not yet linked)
132 loaded, // loaded and inserted in class hierarchy (but not linked yet)
133 linked, // successfully linked/verified (but not initialized yet)
134 being_initialized, // currently running class initializer
135 fully_initialized, // initialized (successfull final state)
136 initialization_error // error happened during initialization
137 };
138
139 static int number_of_instance_classes() { return _total_instanceKlass_count; }
140
141 private:
142 static volatile int _total_instanceKlass_count;
143 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
144
145 protected:
146 // Annotations for this class
147 Annotations* _annotations;
148 // Package this class is defined in
149 PackageEntry* _package_entry;
150 // Array classes holding elements of this class.
151 Klass* volatile _array_klasses;
152 // Constant pool for this class.
153 ConstantPool* _constants;
154 // The InnerClasses attribute and EnclosingMethod attribute. The
155 // _inner_classes is an array of shorts. If the class has InnerClasses
156 // attribute, then the _inner_classes array begins with 4-tuples of shorts
157 // [inner_class_info_index, outer_class_info_index,
158 // inner_name_index, inner_class_access_flags] for the InnerClasses
159 // attribute. If the EnclosingMethod attribute exists, it occupies the
160 // last two shorts [class_index, method_index] of the array. If only
161 // the InnerClasses attribute exists, the _inner_classes array length is
162 // number_of_inner_classes * 4. If the class has both InnerClasses
163 // and EnclosingMethod attributes the _inner_classes array length is
164 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
165 Array<jushort>* _inner_classes;
166
167 // the source debug extension for this klass, NULL if not specified.
168 // Specified as UTF-8 string without terminating zero byte in the classfile,
169 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
170 const char* _source_debug_extension;
171 // Array name derived from this class which needs unreferencing
172 // if this class is unloaded.
173 Symbol* _array_name;
174
175 // Number of heapOopSize words used by non-static fields in this klass
176 // (including inherited fields but after header_size()).
177 int _nonstatic_field_size;
178 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
179 // Constant pool index to the utf8 entry of the Generic signature,
180 // or 0 if none.
181 u2 _generic_signature_index;
182 // Constant pool index to the utf8 entry for the name of source file
183 // containing this klass, 0 if not specified.
184 u2 _source_file_name_index;
185 u2 _static_oop_field_count;// number of static oop fields in this klass
186 u2 _java_fields_count; // The number of declared Java fields
187 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
188
189 int _itable_len; // length of Java itable (in words)
190 // _is_marked_dependent can be set concurrently, thus cannot be part of the
191 // _misc_flags.
192 bool _is_marked_dependent; // used for marking during flushing and deoptimization
193 bool _is_being_redefined; // used for locking redefinition
194
195 // The low two bits of _misc_flags contains the kind field.
196 // This can be used to quickly discriminate among the four kinds of
197 // InstanceKlass.
198
199 static const unsigned _misc_kind_field_size = 2;
200 static const unsigned _misc_kind_field_pos = 0;
201 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
202
203 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
204 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
205 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
206 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
207
208 // Start after _misc_kind field.
209 enum {
210 _misc_rewritten = 1 << 2, // methods rewritten.
211 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops
212 _misc_should_verify_class = 1 << 4, // allow caching of preverification
213 _misc_is_anonymous = 1 << 5, // has embedded _host_klass field
214 _misc_is_contended = 1 << 6, // marked with contended annotation
215 _misc_has_default_methods = 1 << 7, // class/superclass/implemented interfaces has default methods
216 _misc_declares_default_methods = 1 << 8, // directly declares default methods (any access)
217 _misc_has_been_redefined = 1 << 9, // class has been redefined
218 _misc_is_scratch_class = 1 << 10, // class is the redefined scratch class
219 _misc_is_shared_boot_class = 1 << 11, // defining class loader is boot class loader
220 _misc_is_shared_platform_class = 1 << 12, // defining class loader is platform class loader
221 _misc_is_shared_app_class = 1 << 13 // defining class loader is app class loader
222 };
223 u2 loader_type_bits() {
224 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
225 }
226 u2 _misc_flags;
227 u2 _minor_version; // minor version number of class file
228 u2 _major_version; // major version number of class file
229 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
230 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
231 MemberNameTable* _member_names; // Member names
232 JNIid* _jni_ids; // First JNI identifier for static fields in this class
233 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
234 intptr_t _dep_context; // packed DependencyContext structure
235 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
236 #if INCLUDE_JVMTI
237 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
238 // Linked instanceKlasses of previous versions
239 InstanceKlass* _previous_versions;
240 // JVMTI fields can be moved to their own structure - see 6315920
241 // JVMTI: cached class file, before retransformable agent modified it in CFLH
242 JvmtiCachedClassFileData* _cached_class_file;
243 #endif
244
245 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
246
247 // Class states are defined as ClassState (see above).
248 // Place the _init_state here to utilize the unused 2-byte after
249 // _idnum_allocated_count.
250 u1 _init_state; // state of class
251 u1 _reference_type; // reference type
252
253 #if INCLUDE_JVMTI
254 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
255 #endif
256
257 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
258
259 // Method array.
260 Array<Method*>* _methods;
261 // Default Method Array, concrete methods inherited from interfaces
262 Array<Method*>* _default_methods;
263 // Interface (Klass*s) this class declares locally to implement.
264 Array<Klass*>* _local_interfaces;
265 // Interface (Klass*s) this class implements transitively.
266 Array<Klass*>* _transitive_interfaces;
267 // Int array containing the original order of method in the class file (for JVMTI).
268 Array<int>* _method_ordering;
269 // Int array containing the vtable_indices for default_methods
270 // offset matches _default_methods offset
271 Array<int>* _default_vtable_indices;
272
273 // Instance and static variable information, starts with 6-tuples of shorts
274 // [access, name index, sig index, initval index, low_offset, high_offset]
275 // for all fields, followed by the generic signature data at the end of
276 // the array. Only fields with generic signature attributes have the generic
277 // signature data set in the array. The fields array looks like following:
278 //
279 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
280 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
281 // ...
282 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
283 // [generic signature index]
284 // [generic signature index]
285 // ...
286 Array<u2>* _fields;
287
288 // embedded Java vtable follows here
289 // embedded Java itables follows here
290 // embedded static fields follows here
291 // embedded nonstatic oop-map blocks follows here
292 // embedded implementor of this interface follows here
293 // The embedded implementor only exists if the current klass is an
294 // iterface. The possible values of the implementor fall into following
295 // three cases:
296 // NULL: no implementor.
297 // A Klass* that's not itself: one implementor.
298 // Itself: more than one implementors.
299 // embedded host klass follows here
300 // The embedded host klass only exists in an anonymous class for
301 // dynamic language support (JSR 292 enabled). The host class grants
302 // its access privileges to this class also. The host class is either
303 // named, or a previously loaded anonymous class. A non-anonymous class
304 // or an anonymous class loaded through normal classloading does not
305 // have this embedded field.
306 //
307
308 friend class SystemDictionary;
309
310 public:
311 u2 loader_type() {
312 return _misc_flags & loader_type_bits();
313 }
314
315 bool is_shared_boot_class() const {
316 return (_misc_flags & _misc_is_shared_boot_class) != 0;
317 }
318 bool is_shared_platform_class() const {
319 return (_misc_flags & _misc_is_shared_platform_class) != 0;
320 }
321 bool is_shared_app_class() const {
322 return (_misc_flags & _misc_is_shared_app_class) != 0;
323 }
324
325 void set_class_loader_type(s2 loader_type) {
326 assert(( _misc_flags & loader_type_bits()) == 0,
327 "Should only be called once for each class.");
328 switch (loader_type) {
329 case ClassLoader::BOOT_LOADER:
330 _misc_flags |= _misc_is_shared_boot_class;
331 break;
332 case ClassLoader::PLATFORM_LOADER:
333 _misc_flags |= _misc_is_shared_platform_class;
334 break;
335 case ClassLoader::APP_LOADER:
336 _misc_flags |= _misc_is_shared_app_class;
337 break;
338 default:
339 ShouldNotReachHere();
340 break;
341 }
342 }
343
344 bool has_nonstatic_fields() const {
345 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
346 }
347 void set_has_nonstatic_fields(bool b) {
348 if (b) {
349 _misc_flags |= _misc_has_nonstatic_fields;
350 } else {
351 _misc_flags &= ~_misc_has_nonstatic_fields;
352 }
353 }
354
355 // field sizes
356 int nonstatic_field_size() const { return _nonstatic_field_size; }
357 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
358
359 int static_field_size() const { return _static_field_size; }
360 void set_static_field_size(int size) { _static_field_size = size; }
361
362 int static_oop_field_count() const { return (int)_static_oop_field_count; }
363 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
364
365 // Java itable
366 int itable_length() const { return _itable_len; }
367 void set_itable_length(int len) { _itable_len = len; }
368
369 // array klasses
370 Klass* array_klasses() const { return _array_klasses; }
371 inline Klass* array_klasses_acquire() const; // load with acquire semantics
372 void set_array_klasses(Klass* k) { _array_klasses = k; }
373 inline void release_set_array_klasses(Klass* k); // store with release semantics
374
375 // methods
376 Array<Method*>* methods() const { return _methods; }
377 void set_methods(Array<Method*>* a) { _methods = a; }
378 Method* method_with_idnum(int idnum);
379 Method* method_with_orig_idnum(int idnum);
380 Method* method_with_orig_idnum(int idnum, int version);
381
382 // method ordering
383 Array<int>* method_ordering() const { return _method_ordering; }
384 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
385 void copy_method_ordering(const intArray* m, TRAPS);
386
387 // default_methods
388 Array<Method*>* default_methods() const { return _default_methods; }
389 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
390
391 // default method vtable_indices
392 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
393 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
394 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
395
396 // interfaces
397 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
398 void set_local_interfaces(Array<Klass*>* a) {
399 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
400 _local_interfaces = a; }
401
402 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
403 void set_transitive_interfaces(Array<Klass*>* a) {
404 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
405 _transitive_interfaces = a;
406 }
407
408 private:
409 friend class fieldDescriptor;
410 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
411
412 public:
413 int field_offset (int index) const { return field(index)->offset(); }
414 int field_access_flags(int index) const { return field(index)->access_flags(); }
415 Symbol* field_name (int index) const { return field(index)->name(constants()); }
416 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
417
418 // Number of Java declared fields
419 int java_fields_count() const { return (int)_java_fields_count; }
420
421 Array<u2>* fields() const { return _fields; }
422 void set_fields(Array<u2>* f, u2 java_fields_count) {
423 guarantee(_fields == NULL || f == NULL, "Just checking");
424 _fields = f;
425 _java_fields_count = java_fields_count;
426 }
427
428 // inner classes
429 Array<u2>* inner_classes() const { return _inner_classes; }
430 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
431
432 enum InnerClassAttributeOffset {
433 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
434 inner_class_inner_class_info_offset = 0,
435 inner_class_outer_class_info_offset = 1,
436 inner_class_inner_name_offset = 2,
437 inner_class_access_flags_offset = 3,
438 inner_class_next_offset = 4
439 };
440
441 enum EnclosingMethodAttributeOffset {
442 enclosing_method_class_index_offset = 0,
443 enclosing_method_method_index_offset = 1,
444 enclosing_method_attribute_size = 2
445 };
446
447 // method override check
448 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
449
450 // package
451 PackageEntry* package() const { return _package_entry; }
452 ModuleEntry* module() const;
453 bool in_unnamed_package() const { return (_package_entry == NULL); }
454 void set_package(PackageEntry* p) { _package_entry = p; }
455 void set_package(ClassLoaderData* loader_data, TRAPS);
456 bool is_same_class_package(const Klass* class2) const;
457 bool is_same_class_package(oop classloader2, const Symbol* classname2) const;
458 static bool is_same_class_package(oop class_loader1,
459 const Symbol* class_name1,
460 oop class_loader2,
461 const Symbol* class_name2);
462
463 // find an enclosing class
464 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const {
465 return compute_enclosing_class_impl(this, inner_is_member, THREAD);
466 }
467 static InstanceKlass* compute_enclosing_class_impl(const InstanceKlass* self,
468 bool* inner_is_member,
469 TRAPS);
470
471 // Find InnerClasses attribute for k and return outer_class_info_index & inner_name_index.
472 static bool find_inner_classes_attr(instanceKlassHandle k,
473 int* ooff, int* noff, TRAPS);
474
475 private:
476 // Check prohibited package ("java/" only loadable by boot or platform loaders)
477 static void check_prohibited_package(Symbol* class_name,
478 Handle class_loader,
479 TRAPS);
480 public:
481 // tell if two classes have the same enclosing class (at package level)
482 bool is_same_package_member(const Klass* class2, TRAPS) const {
483 return is_same_package_member_impl(this, class2, THREAD);
484 }
485 static bool is_same_package_member_impl(const InstanceKlass* self,
486 const Klass* class2,
487 TRAPS);
488
489 // initialization state
490 bool is_loaded() const { return _init_state >= loaded; }
491 bool is_linked() const { return _init_state >= linked; }
492 bool is_initialized() const { return _init_state == fully_initialized; }
493 bool is_not_initialized() const { return _init_state < being_initialized; }
494 bool is_being_initialized() const { return _init_state == being_initialized; }
495 bool is_in_error_state() const { return _init_state == initialization_error; }
496 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
497 ClassState init_state() { return (ClassState)_init_state; }
498 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
499
500 // defineClass specified verification
501 bool should_verify_class() const {
502 return (_misc_flags & _misc_should_verify_class) != 0;
503 }
504 void set_should_verify_class(bool value) {
505 if (value) {
506 _misc_flags |= _misc_should_verify_class;
507 } else {
508 _misc_flags &= ~_misc_should_verify_class;
509 }
510 }
511
512 // marking
513 bool is_marked_dependent() const { return _is_marked_dependent; }
514 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
515
516 // initialization (virtuals from Klass)
517 bool should_be_initialized() const; // means that initialize should be called
518 void initialize(TRAPS);
519 void link_class(TRAPS);
520 bool link_class_or_fail(TRAPS); // returns false on failure
521 void unlink_class();
522 void rewrite_class(TRAPS);
523 void link_methods(TRAPS);
524 Method* class_initializer();
525
526 // set the class to initialized if no static initializer is present
527 void eager_initialize(Thread *thread);
528
529 // reference type
530 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
531 void set_reference_type(ReferenceType t) {
532 assert(t == (u1)t, "overflow");
533 _reference_type = (u1)t;
534 }
535
536 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
537
538 // find local field, returns true if found
539 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
540 // find field in direct superinterfaces, returns the interface in which the field is defined
541 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
542 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
543 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
544 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
545 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
546
547 // find a non-static or static field given its offset within the class.
548 bool contains_field_offset(int offset) {
549 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
550 }
551
552 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
553 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
554
555 // find a local method (returns NULL if not found)
556 Method* find_method(const Symbol* name, const Symbol* signature) const;
557 static Method* find_method(const Array<Method*>* methods,
558 const Symbol* name,
559 const Symbol* signature);
560
561 // find a local method, but skip static methods
562 Method* find_instance_method(const Symbol* name, const Symbol* signature) const;
563 static Method* find_instance_method(const Array<Method*>* methods,
564 const Symbol* name,
565 const Symbol* signature);
566
567 // find a local method (returns NULL if not found)
568 Method* find_local_method(const Symbol* name,
569 const Symbol* signature,
570 OverpassLookupMode overpass_mode,
571 StaticLookupMode static_mode,
572 PrivateLookupMode private_mode) const;
573
574 // find a local method from given methods array (returns NULL if not found)
575 static Method* find_local_method(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 // find a local method index in methods or default_methods (returns -1 if not found)
583 static int find_method_index(const Array<Method*>* methods,
584 const Symbol* name,
585 const Symbol* signature,
586 OverpassLookupMode overpass_mode,
587 StaticLookupMode static_mode,
588 PrivateLookupMode private_mode);
589
590 // lookup operation (returns NULL if not found)
591 Method* uncached_lookup_method(const Symbol* name,
592 const Symbol* signature,
593 OverpassLookupMode overpass_mode) const;
594
595 // lookup a method in all the interfaces that this class implements
596 // (returns NULL if not found)
597 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
598
599 // lookup a method in local defaults then in all interfaces
600 // (returns NULL if not found)
601 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
602
603 // Find method indices by name. If a method with the specified name is
604 // found the index to the first method is returned, and 'end' is filled in
605 // with the index of first non-name-matching method. If no method is found
606 // -1 is returned.
607 int find_method_by_name(const Symbol* name, int* end) const;
608 static int find_method_by_name(const Array<Method*>* methods,
609 const Symbol* name, int* end);
610
611 // constant pool
612 ConstantPool* constants() const { return _constants; }
613 void set_constants(ConstantPool* c) { _constants = c; }
614
615 // protection domain
616 oop protection_domain() const;
617
618 // signers
619 objArrayOop signers() const;
620
621 // host class
622 InstanceKlass* host_klass() const {
623 InstanceKlass** hk = adr_host_klass();
624 if (hk == NULL) {
625 return NULL;
626 } else {
627 assert(*hk != NULL, "host klass should always be set if the address is not null");
628 return *hk;
629 }
630 }
631 void set_host_klass(const InstanceKlass* host) {
632 assert(is_anonymous(), "not anonymous");
633 const InstanceKlass** addr = (const InstanceKlass **)adr_host_klass();
634 assert(addr != NULL, "no reversed space");
635 if (addr != NULL) {
636 *addr = host;
637 }
638 }
639 bool is_anonymous() const {
640 return (_misc_flags & _misc_is_anonymous) != 0;
641 }
642 void set_is_anonymous(bool value) {
643 if (value) {
644 _misc_flags |= _misc_is_anonymous;
645 } else {
646 _misc_flags &= ~_misc_is_anonymous;
647 }
648 }
649
650 // Oop that keeps the metadata for this class from being unloaded
651 // in places where the metadata is stored in other places, like nmethods
652 oop klass_holder() const {
653 return is_anonymous() ? java_mirror() : class_loader();
654 }
655
656 bool is_contended() const {
657 return (_misc_flags & _misc_is_contended) != 0;
658 }
659 void set_is_contended(bool value) {
660 if (value) {
661 _misc_flags |= _misc_is_contended;
662 } else {
663 _misc_flags &= ~_misc_is_contended;
664 }
665 }
666
667 // source file name
668 Symbol* source_file_name() const {
669 return (_source_file_name_index == 0) ?
670 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
671 }
672 u2 source_file_name_index() const {
673 return _source_file_name_index;
674 }
675 void set_source_file_name_index(u2 sourcefile_index) {
676 _source_file_name_index = sourcefile_index;
677 }
678
679 // minor and major version numbers of class file
680 u2 minor_version() const { return _minor_version; }
681 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
682 u2 major_version() const { return _major_version; }
683 void set_major_version(u2 major_version) { _major_version = major_version; }
684
685 // source debug extension
686 const char* source_debug_extension() const { return _source_debug_extension; }
687 void set_source_debug_extension(const char* array, int length);
688
689 // symbol unloading support (refcount already added)
690 Symbol* array_name() { return _array_name; }
691 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
692
693 // nonstatic oop-map blocks
694 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
695 return oop_map_count * OopMapBlock::size_in_words();
696 }
697 unsigned int nonstatic_oop_map_count() const {
698 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
699 }
700 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
701 void set_nonstatic_oop_map_size(int words) {
702 _nonstatic_oop_map_size = words;
703 }
704
705 #if INCLUDE_JVMTI
706 // Redefinition locking. Class can only be redefined by one thread at a time.
707 bool is_being_redefined() const { return _is_being_redefined; }
708 void set_is_being_redefined(bool value) { _is_being_redefined = value; }
709
710 // RedefineClasses() support for previous versions:
711 void add_previous_version(instanceKlassHandle ikh, int emcp_method_count);
712 void purge_previous_version_list();
713
714 InstanceKlass* previous_versions() const { return _previous_versions; }
715 #else
716 InstanceKlass* previous_versions() const { return NULL; }
717 #endif
718
719 InstanceKlass* get_klass_version(int version) {
720 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
721 if (ik->constants()->version() == version) {
722 return ik;
723 }
724 }
725 return NULL;
726 }
727
728 bool has_been_redefined() const {
729 return (_misc_flags & _misc_has_been_redefined) != 0;
730 }
731 void set_has_been_redefined() {
732 _misc_flags |= _misc_has_been_redefined;
733 }
734
735 bool is_scratch_class() const {
736 return (_misc_flags & _misc_is_scratch_class) != 0;
737 }
738
739 void set_is_scratch_class() {
740 _misc_flags |= _misc_is_scratch_class;
741 }
742
743 private:
744
745 void set_kind(unsigned kind) {
746 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
747 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
748 unsigned flags = _misc_flags & ~fmask;
749 _misc_flags = (flags | (kind << _misc_kind_field_pos));
750 }
751
752 bool is_kind(unsigned desired) const {
753 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
754 return kind == desired;
755 }
756
757 public:
758
759 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
760 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
761 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
762 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
763 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
764
765 #if INCLUDE_JVMTI
766
767 void init_previous_versions() {
768 _previous_versions = NULL;
769 }
770
771 private:
772 static bool _has_previous_versions;
773 public:
774 static void purge_previous_versions(InstanceKlass* ik) {
775 if (ik->has_been_redefined()) {
776 ik->purge_previous_version_list();
777 }
778 }
779
780 static bool has_previous_versions_and_reset();
781
782 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
783 void set_cached_class_file(JvmtiCachedClassFileData *data) {
784 _cached_class_file = data;
785 }
786 JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; }
787 jint get_cached_class_file_len();
788 unsigned char * get_cached_class_file_bytes();
789
790 // JVMTI: Support for caching of field indices, types, and offsets
791 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
792 _jvmti_cached_class_field_map = descriptor;
793 }
794 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
795 return _jvmti_cached_class_field_map;
796 }
797
798 #else // INCLUDE_JVMTI
799
800 static void purge_previous_versions(InstanceKlass* ik) { return; };
801 static bool has_previous_versions_and_reset() { return false; }
802
803 void set_cached_class_file(JvmtiCachedClassFileData *data) {
804 assert(data == NULL, "unexpected call with JVMTI disabled");
805 }
806 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
807
808 #endif // INCLUDE_JVMTI
809
810 bool has_default_methods() const {
811 return (_misc_flags & _misc_has_default_methods) != 0;
812 }
813 void set_has_default_methods(bool b) {
814 if (b) {
815 _misc_flags |= _misc_has_default_methods;
816 } else {
817 _misc_flags &= ~_misc_has_default_methods;
818 }
819 }
820
821 bool declares_default_methods() const {
822 return (_misc_flags & _misc_declares_default_methods) != 0;
823 }
824 void set_declares_default_methods(bool b) {
825 if (b) {
826 _misc_flags |= _misc_declares_default_methods;
827 } else {
828 _misc_flags &= ~_misc_declares_default_methods;
829 }
830 }
831
832 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
833 inline u2 next_method_idnum();
834 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
835
836 // generics support
837 Symbol* generic_signature() const {
838 return (_generic_signature_index == 0) ?
839 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
840 }
841 u2 generic_signature_index() const {
842 return _generic_signature_index;
843 }
844 void set_generic_signature_index(u2 sig_index) {
845 _generic_signature_index = sig_index;
846 }
847
848 u2 enclosing_method_data(int offset) const;
849 u2 enclosing_method_class_index() const {
850 return enclosing_method_data(enclosing_method_class_index_offset);
851 }
852 u2 enclosing_method_method_index() {
853 return enclosing_method_data(enclosing_method_method_index_offset);
854 }
855 void set_enclosing_method_indices(u2 class_index,
856 u2 method_index);
857
858 // jmethodID support
859 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
860 const methodHandle& method_h);
861 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
862 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
863 jmethodID* to_dealloc_id_p,
864 jmethodID** to_dealloc_jmeths_p);
865 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
866 size_t *length_p, jmethodID* id_p);
867 void ensure_space_for_methodids(int start_offset = 0);
868 jmethodID jmethod_id_or_null(Method* method);
869
870 // annotations support
871 Annotations* annotations() const { return _annotations; }
872 void set_annotations(Annotations* anno) { _annotations = anno; }
873
874 AnnotationArray* class_annotations() const {
875 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
876 }
877 Array<AnnotationArray*>* fields_annotations() const {
878 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
879 }
880 AnnotationArray* class_type_annotations() const {
881 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
882 }
883 Array<AnnotationArray*>* fields_type_annotations() const {
884 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
885 }
886 // allocation
887 instanceOop allocate_instance(TRAPS);
888
889 // additional member function to return a handle
890 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
891
892 objArrayOop allocate_objArray(int n, int length, TRAPS);
893 // Helper function
894 static instanceOop register_finalizer(instanceOop i, TRAPS);
895
896 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
897 // if not, throw either an Error or an Exception.
898 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
899
900 // initialization
901 void call_class_initializer(TRAPS);
902 void set_initialization_state_and_notify(ClassState state, TRAPS);
903
904 // OopMapCache support
905 OopMapCache* oop_map_cache() { return _oop_map_cache; }
906 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
907 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
908
909 // JNI identifier support (for static fields - for jni performance)
910 JNIid* jni_ids() { return _jni_ids; }
911 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
912 JNIid* jni_id_for(int offset);
913
914 // maintenance of deoptimization dependencies
915 inline DependencyContext dependencies();
916 int mark_dependent_nmethods(KlassDepChange& changes);
917 void add_dependent_nmethod(nmethod* nm);
918 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
919
920 // On-stack replacement support
921 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
922 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
923 void add_osr_nmethod(nmethod* n);
924 bool remove_osr_nmethod(nmethod* n);
925 int mark_osr_nmethods(const Method* m);
926 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
927
928 #if INCLUDE_JVMTI
929 // Breakpoint support (see methods on Method* for details)
930 BreakpointInfo* breakpoints() const { return _breakpoints; };
931 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
932 #endif
933
934 // support for stub routines
935 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
936 TRACE_DEFINE_KLASS_TRACE_ID_OFFSET;
937 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
938
939 // subclass/subinterface checks
940 bool implements_interface(Klass* k) const;
941 bool is_same_or_direct_interface(Klass* k) const;
942
943 #ifdef ASSERT
944 // check whether this class or one of its superclasses was redefined
945 bool has_redefined_this_or_super() const;
946 #endif
947
948 // Access to the implementor of an interface.
949 Klass* implementor() const
950 {
951 Klass** k = adr_implementor();
952 if (k == NULL) {
953 return NULL;
954 } else {
955 return *k;
956 }
957 }
958
959 void set_implementor(Klass* k) {
960 assert(is_interface(), "not interface");
961 Klass** addr = adr_implementor();
962 assert(addr != NULL, "null addr");
963 if (addr != NULL) {
964 *addr = k;
965 }
966 }
967
968 int nof_implementors() const {
969 Klass* k = implementor();
970 if (k == NULL) {
971 return 0;
972 } else if (k != this) {
973 return 1;
974 } else {
975 return 2;
976 }
977 }
978
979 void add_implementor(Klass* k); // k is a new class that implements this interface
980 void init_implementor(); // initialize
981
982 // link this class into the implementors list of every interface it implements
983 void process_interfaces(Thread *thread);
984
985 // virtual operations from Klass
986 bool is_leaf_class() const { return _subklass == NULL; }
987 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
988 bool compute_is_subtype_of(Klass* k);
989 bool can_be_primary_super_slow() const;
990 int oop_size(oop obj) const { return size_helper(); }
991 // slow because it's a virtual call and used for verifying the layout_helper.
992 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
993 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
994
995 // Iterators
996 void do_local_static_fields(FieldClosure* cl);
997 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
998 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
999
1000 void methods_do(void f(Method* method));
1001 void array_klasses_do(void f(Klass* k));
1002 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
1003 bool super_types_do(SuperTypeClosure* blk);
1004
1005 static InstanceKlass* cast(Klass* k) {
1006 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
1007 }
1008
1009 static const InstanceKlass* cast(const Klass* k) {
1010 assert(k != NULL, "k should not be null");
1011 assert(k->is_instance_klass(), "cast to InstanceKlass");
1012 return static_cast<const InstanceKlass*>(k);
1013 }
1014
1015 InstanceKlass* java_super() const {
1016 return (super() == NULL) ? NULL : cast(super());
1017 }
1018
1019 // Sizing (in words)
1020 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
1021
1022 static int size(int vtable_length, int itable_length,
1023 int nonstatic_oop_map_size,
1024 bool is_interface, bool is_anonymous) {
1025 return align_metadata_size(header_size() +
1026 vtable_length +
1027 itable_length +
1028 nonstatic_oop_map_size +
1029 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1030 (is_anonymous ? (int)sizeof(Klass*)/wordSize : 0));
1031 }
1032 int size() const { return size(vtable_length(),
1033 itable_length(),
1034 nonstatic_oop_map_size(),
1035 is_interface(),
1036 is_anonymous());
1037 }
1038 #if INCLUDE_SERVICES
1039 virtual void collect_statistics(KlassSizeStats *sz) const;
1040 #endif
1041
1042 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + vtable_length(); }
1043 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
1044
1045 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1046
1047 address static_field_addr(int offset);
1048
1049 OopMapBlock* start_of_nonstatic_oop_maps() const {
1050 return (OopMapBlock*)(start_of_itable() + itable_length());
1051 }
1052
1053 Klass** end_of_nonstatic_oop_maps() const {
1054 return (Klass**)(start_of_nonstatic_oop_maps() +
1055 nonstatic_oop_map_count());
1056 }
1057
1058 Klass** adr_implementor() const {
1059 if (is_interface()) {
1060 return (Klass**)end_of_nonstatic_oop_maps();
1061 } else {
1062 return NULL;
1063 }
1064 };
1065
1066 InstanceKlass** adr_host_klass() const {
1067 if (is_anonymous()) {
1068 InstanceKlass** adr_impl = (InstanceKlass **)adr_implementor();
1069 if (adr_impl != NULL) {
1070 return adr_impl + 1;
1071 } else {
1072 return (InstanceKlass **)end_of_nonstatic_oop_maps();
1073 }
1074 } else {
1075 return NULL;
1076 }
1077 }
1078
1079 // Use this to return the size of an instance in heap words:
1080 int size_helper() const {
1081 return layout_helper_to_size_helper(layout_helper());
1082 }
1083
1084 // This bit is initialized in classFileParser.cpp.
1085 // It is false under any of the following conditions:
1086 // - the class is abstract (including any interface)
1087 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1088 // - the class size is larger than FastAllocateSizeLimit
1089 // - the class is java/lang/Class, which cannot be allocated directly
1090 bool can_be_fastpath_allocated() const {
1091 return !layout_helper_needs_slow_path(layout_helper());
1092 }
1093
1094 // Java itable
1095 klassItable* itable() const; // return new klassItable wrapper
1096 Method* method_at_itable(Klass* holder, int index, TRAPS);
1097
1098 #if INCLUDE_JVMTI
1099 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1100 #endif // INCLUDE_JVMTI
1101
1102 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1103 void clean_implementors_list(BoolObjectClosure* is_alive);
1104 void clean_method_data(BoolObjectClosure* is_alive);
1105
1106 // Explicit metaspace deallocation of fields
1107 // For RedefineClasses and class file parsing errors, we need to deallocate
1108 // instanceKlasses and the metadata they point to.
1109 void deallocate_contents(ClassLoaderData* loader_data);
1110 static void deallocate_methods(ClassLoaderData* loader_data,
1111 Array<Method*>* methods);
1112 void static deallocate_interfaces(ClassLoaderData* loader_data,
1113 const Klass* super_klass,
1114 Array<Klass*>* local_interfaces,
1115 Array<Klass*>* transitive_interfaces);
1116
1117 // The constant pool is on stack if any of the methods are executing or
1118 // referenced by handles.
1119 bool on_stack() const { return _constants->on_stack(); }
1120
1121 // callbacks for actions during class unloading
1122 static void notify_unload_class(InstanceKlass* ik);
1123 static void release_C_heap_structures(InstanceKlass* ik);
1124
1125 // Naming
1126 const char* signature_name() const;
1127 static Symbol* package_from_name(const Symbol* name, TRAPS);
1128
1129 // GC specific object visitors
1130 //
1131 // Mark Sweep
1132 int oop_ms_adjust_pointers(oop obj);
1133 #if INCLUDE_ALL_GCS
1134 // Parallel Scavenge
1135 void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
1136 // Parallel Compact
1137 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
1138 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm);
1139 #endif
1140
1141 // Oop fields (and metadata) iterators
1142 // [nv = true] Use non-virtual calls to do_oop_nv.
1143 // [nv = false] Use virtual calls to do_oop.
1144 //
1145 // The InstanceKlass iterators also visits the Object's klass.
1146
1147 // Forward iteration
1148 public:
1149 // Iterate over all oop fields in the oop maps.
1150 template <bool nv, class OopClosureType>
1151 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1152
1153 protected:
1154 // Iterate over all oop fields and metadata.
1155 template <bool nv, class OopClosureType>
1156 inline int oop_oop_iterate(oop obj, OopClosureType* closure);
1157
1158 private:
1159 // Iterate over all oop fields in the oop maps.
1160 // Specialized for [T = oop] or [T = narrowOop].
1161 template <bool nv, typename T, class OopClosureType>
1162 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure);
1163
1164 // Iterate over all oop fields in one oop map.
1165 template <bool nv, typename T, class OopClosureType>
1166 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1167
1168
1169 // Reverse iteration
1170 #if INCLUDE_ALL_GCS
1171 public:
1172 // Iterate over all oop fields in the oop maps.
1173 template <bool nv, class OopClosureType>
1174 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1175
1176 protected:
1177 // Iterate over all oop fields and metadata.
1178 template <bool nv, class OopClosureType>
1179 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1180
1181 private:
1182 // Iterate over all oop fields in the oop maps.
1183 // Specialized for [T = oop] or [T = narrowOop].
1184 template <bool nv, typename T, class OopClosureType>
1185 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure);
1186
1187 // Iterate over all oop fields in one oop map.
1188 template <bool nv, typename T, class OopClosureType>
1189 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1190 #endif
1191
1192
1193 // Bounded range iteration
1194 public:
1195 // Iterate over all oop fields in the oop maps.
1196 template <bool nv, class OopClosureType>
1197 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1198
1199 protected:
1200 // Iterate over all oop fields and metadata.
1201 template <bool nv, class OopClosureType>
1202 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1203
1204 private:
1205 // Iterate over all oop fields in the oop maps.
1206 // Specialized for [T = oop] or [T = narrowOop].
1207 template <bool nv, typename T, class OopClosureType>
1208 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1209
1210 // Iterate over all oop fields in one oop map.
1211 template <bool nv, typename T, class OopClosureType>
1212 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1213
1214
1215 public:
1216
1217 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
1218 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
1219
1220 #if INCLUDE_ALL_GCS
1221 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
1222 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
1223 #endif // INCLUDE_ALL_GCS
1224
1225 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1226
1227 public:
1228 void set_in_error_state() {
1229 assert(DumpSharedSpaces, "only call this when dumping archive");
1230 _init_state = initialization_error;
1231 }
1232 bool check_sharing_error_state();
1233
1234 private:
1235 // initialization state
1236 #ifdef ASSERT
1237 void set_init_state(ClassState state);
1238 #else
1239 void set_init_state(ClassState state) { _init_state = (u1)state; }
1240 #endif
1241 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1242 void set_init_thread(Thread *thread) { _init_thread = thread; }
1243
1244 // The RedefineClasses() API can cause new method idnums to be needed
1245 // which will cause the caches to grow. Safety requires different
1246 // cache management logic if the caches can grow instead of just
1247 // going from NULL to non-NULL.
1248 bool idnum_can_increment() const { return has_been_redefined(); }
1249 inline jmethodID* methods_jmethod_ids_acquire() const;
1250 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1251
1252 // Lock during initialization
1253 public:
1254 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1255 // Must be one per class and it has to be a VM internal object so java code
1256 // cannot lock it (like the mirror).
1257 // It has to be an object not a Mutex because it's held through java calls.
1258 oop init_lock() const;
1259 private:
1260 void fence_and_clear_init_lock();
1261
1262 // Static methods that are used to implement member methods where an exposed this pointer
1263 // is needed due to possible GCs
1264 static bool link_class_impl (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS);
1265 static bool verify_code (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS);
1266 static void initialize_impl (instanceKlassHandle this_k, TRAPS);
1267 static void initialize_super_interfaces (instanceKlassHandle this_k, TRAPS);
1268 static void eager_initialize_impl (instanceKlassHandle this_k);
1269 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_k, ClassState state, TRAPS);
1270 static void call_class_initializer_impl (instanceKlassHandle this_k, TRAPS);
1271 static Klass* array_klass_impl (instanceKlassHandle this_k, bool or_null, int n, TRAPS);
1272 static void do_local_static_fields_impl (instanceKlassHandle this_k, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS);
1273 /* jni_id_for_impl for jfieldID only */
1274 static JNIid* jni_id_for_impl (instanceKlassHandle this_k, int offset);
1275
1276 // Returns the array class for the n'th dimension
1277 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1278
1279 // Returns the array class with this class as element type
1280 Klass* array_klass_impl(bool or_null, TRAPS);
1281
1282 // find a local method (returns NULL if not found)
1283 Method* find_method_impl(const Symbol* name,
1284 const Symbol* signature,
1285 OverpassLookupMode overpass_mode,
1286 StaticLookupMode static_mode,
1287 PrivateLookupMode private_mode) const;
1288
1289 static Method* find_method_impl(const Array<Method*>* methods,
1290 const Symbol* name,
1291 const Symbol* signature,
1292 OverpassLookupMode overpass_mode,
1293 StaticLookupMode static_mode,
1294 PrivateLookupMode private_mode);
1295
1296 // Free CHeap allocated fields.
1297 void release_C_heap_structures();
1298
1299 #if INCLUDE_JVMTI
1300 // RedefineClasses support
1301 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1302 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1303 #endif
1304 public:
1305 // CDS support - remove and restore oops from metadata. Oops are not shared.
1306 virtual void remove_unshareable_info();
1307 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1308
1309 // jvm support
1310 jint compute_modifier_flags(TRAPS) const;
1311
1312 // JSR-292 support
1313 MemberNameTable* member_names() { return _member_names; }
1314 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; }
1315 bool add_member_name(Handle member_name);
1316
1317 public:
1318 // JVMTI support
1319 jint jvmti_class_status() const;
1320
1321 public:
1322 // Printing
1323 #ifndef PRODUCT
1324 void print_on(outputStream* st) const;
1325 #endif
1326 void print_value_on(outputStream* st) const;
1327
1328 void oop_print_value_on(oop obj, outputStream* st);
1329
1330 #ifndef PRODUCT
1331 void oop_print_on (oop obj, outputStream* st);
1332
1333 void print_dependent_nmethods(bool verbose = false);
1334 bool is_dependent_nmethod(nmethod* nm);
1335 #endif
1336
1337 const char* internal_name() const;
1338
1339 // Verification
1340 void verify_on(outputStream* st);
1341
1342 void oop_verify_on(oop obj, outputStream* st);
1343
1344 // Logging
1345 void print_loading_log(LogLevel::type type, ClassLoaderData* loader_data,
1346 const char* module_name, const ClassFileStream* cfs) const;
1347 };
1348
1349 // for adding methods
1350 // UNSET_IDNUM return means no more ids available
1351 inline u2 InstanceKlass::next_method_idnum() {
1352 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1353 return ConstMethod::UNSET_IDNUM; // no more ids available
1354 } else {
1355 return _idnum_allocated_count++;
1356 }
1357 }
1358
1359
1360 /* JNIid class for jfieldIDs only */
1361 class JNIid: public CHeapObj<mtClass> {
1362 friend class VMStructs;
1363 private:
1364 Klass* _holder;
1365 JNIid* _next;
1366 int _offset;
1367 #ifdef ASSERT
1368 bool _is_static_field_id;
1369 #endif
1370
1371 public:
1372 // Accessors
1373 Klass* holder() const { return _holder; }
1374 int offset() const { return _offset; }
1375 JNIid* next() { return _next; }
1376 // Constructor
1377 JNIid(Klass* holder, int offset, JNIid* next);
1378 // Identifier lookup
1379 JNIid* find(int offset);
1380
1381 bool find_local_field(fieldDescriptor* fd) {
1382 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1383 }
1384
1385 static void deallocate(JNIid* id);
1386 // Debugging
1387 #ifdef ASSERT
1388 bool is_static_field_id() const { return _is_static_field_id; }
1389 void set_is_static_field_id() { _is_static_field_id = true; }
1390 #endif
1391 void verify(Klass* holder);
1392 };
1393
1394 // An iterator that's used to access the inner classes indices in the
1395 // InstanceKlass::_inner_classes array.
1396 class InnerClassesIterator : public StackObj {
1397 private:
1398 Array<jushort>* _inner_classes;
1399 int _length;
1400 int _idx;
1401 public:
1402
1403 InnerClassesIterator(instanceKlassHandle k) {
1404 _inner_classes = k->inner_classes();
1405 if (k->inner_classes() != NULL) {
1406 _length = _inner_classes->length();
1407 // The inner class array's length should be the multiple of
1408 // inner_class_next_offset if it only contains the InnerClasses
1409 // attribute data, or it should be
1410 // n*inner_class_next_offset+enclosing_method_attribute_size
1411 // if it also contains the EnclosingMethod data.
1412 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1413 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1414 "just checking");
1415 // Remove the enclosing_method portion if exists.
1416 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1417 _length -= InstanceKlass::enclosing_method_attribute_size;
1418 }
1419 } else {
1420 _length = 0;
1421 }
1422 _idx = 0;
1423 }
1424
1425 int length() const {
1426 return _length;
1427 }
1428
1429 void next() {
1430 _idx += InstanceKlass::inner_class_next_offset;
1431 }
1432
1433 bool done() const {
1434 return (_idx >= _length);
1435 }
1436
1437 u2 inner_class_info_index() const {
1438 return _inner_classes->at(
1439 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1440 }
1441
1442 void set_inner_class_info_index(u2 index) {
1443 _inner_classes->at_put(
1444 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1445 }
1446
1447 u2 outer_class_info_index() const {
1448 return _inner_classes->at(
1449 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1450 }
1451
1452 void set_outer_class_info_index(u2 index) {
1453 _inner_classes->at_put(
1454 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1455 }
1456
1457 u2 inner_name_index() const {
1458 return _inner_classes->at(
1459 _idx + InstanceKlass::inner_class_inner_name_offset);
1460 }
1461
1462 void set_inner_name_index(u2 index) {
1463 _inner_classes->at_put(
1464 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1465 }
1466
1467 u2 inner_access_flags() const {
1468 return _inner_classes->at(
1469 _idx + InstanceKlass::inner_class_access_flags_offset);
1470 }
1471 };
1472
1473 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP