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 "memory/referenceType.hpp"
34 #include "oops/annotations.hpp"
35 #include "oops/constMethod.hpp"
36 #include "oops/fieldInfo.hpp"
37 #include "oops/instanceOop.hpp"
38 #include "oops/klassVtable.hpp"
39 #include "runtime/handles.hpp"
40 #include "runtime/os.hpp"
41 #include "trace/traceMacros.hpp"
42 #include "utilities/accessFlags.hpp"
43 #include "utilities/bitMap.inline.hpp"
44 #include "utilities/macros.hpp"
45
46 // An InstanceKlass is the VM level representation of a Java class.
47 // It contains all information needed for at class at execution runtime.
48
49 // InstanceKlass embedded field layout (after declared fields):
50 // [EMBEDDED Java vtable ] size in words = vtable_len
51 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
52 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
53 // indicating where oops are located in instances of this klass.
54 // [EMBEDDED implementor of the interface] only exist for interface
55 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled)
56 // [EMBEDDED fingerprint ] only if should_store_fingerprint()==true
57
58
59 // forward declaration for class -- see below for definition
60 #if INCLUDE_JVMTI
61 class BreakpointInfo;
62 #endif
63 class ClassFileParser;
64 class KlassDepChange;
65 class DependencyContext;
66 class fieldDescriptor;
67 class jniIdMapBase;
68 class JNIid;
69 class JvmtiCachedClassFieldMap;
70 class MemberNameTable;
71 class SuperTypeClosure;
72 class BufferedValueTypeBlob;
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 void increment_count(int diff) { _count += diff; }
105
106 int offset_span() const { return _count * heapOopSize; }
107
108 int end_offset() const {
109 return offset() + offset_span();
110 }
111
112 bool is_contiguous(int another_offset) const {
113 return another_offset == end_offset();
114 }
115
116 // sizeof(OopMapBlock) in words.
117 static const int size_in_words() {
118 return align_size_up(int(sizeof(OopMapBlock)), wordSize) >>
119 LogBytesPerWord;
120 }
121
122 static int compare_offset(const OopMapBlock* a, const OopMapBlock* b) {
123 return a->offset() - b->offset();
124 }
125
126 private:
127 int _offset;
128 uint _count;
129 };
130
131 struct JvmtiCachedClassFileData;
132
133 class InstanceKlass: public Klass {
134 friend class VMStructs;
135 friend class JVMCIVMStructs;
136 friend class ClassFileParser;
137 friend class CompileReplay;
138
139 protected:
140 InstanceKlass(const ClassFileParser& parser, unsigned kind);
141
142 public:
143 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
144
145 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
146 // of the class loading & initialization procedure, and the use of the states.
147 enum ClassState {
148 allocated, // allocated (but not yet linked)
149 loaded, // loaded and inserted in class hierarchy (but not linked yet)
150 linked, // successfully linked/verified (but not initialized yet)
151 being_initialized, // currently running class initializer
152 fully_initialized, // initialized (successfull final state)
153 initialization_error // error happened during initialization
154 };
155
156 static int number_of_instance_classes() { return _total_instanceKlass_count; }
157
158 private:
159 static volatile int _total_instanceKlass_count;
160 static InstanceKlass* allocate_instance_klass(const ClassFileParser& parser, TRAPS);
161
162 protected:
163 // Annotations for this class
164 Annotations* _annotations;
165 // Package this class is defined in
166 PackageEntry* _package_entry;
167 // Array classes holding elements of this class.
168 Klass* volatile _array_klasses;
169 // Constant pool for this class.
170 ConstantPool* _constants;
171 // The InnerClasses attribute and EnclosingMethod attribute. The
172 // _inner_classes is an array of shorts. If the class has InnerClasses
173 // attribute, then the _inner_classes array begins with 4-tuples of shorts
174 // [inner_class_info_index, outer_class_info_index,
175 // inner_name_index, inner_class_access_flags] for the InnerClasses
176 // attribute. If the EnclosingMethod attribute exists, it occupies the
177 // last two shorts [class_index, method_index] of the array. If only
178 // the InnerClasses attribute exists, the _inner_classes array length is
179 // number_of_inner_classes * 4. If the class has both InnerClasses
180 // and EnclosingMethod attributes the _inner_classes array length is
181 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
182 Array<jushort>* _inner_classes;
183
184 // the source debug extension for this klass, NULL if not specified.
185 // Specified as UTF-8 string without terminating zero byte in the classfile,
186 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
187 const char* _source_debug_extension;
188 // Array name derived from this class which needs unreferencing
189 // if this class is unloaded.
190 Symbol* _array_name;
191
192 // Number of heapOopSize words used by non-static fields in this klass
193 // (including inherited fields but after header_size()).
194 int _nonstatic_field_size;
195 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
196 // Constant pool index to the utf8 entry of the Generic signature,
197 // or 0 if none.
198 u2 _generic_signature_index;
199 // Constant pool index to the utf8 entry for the name of source file
200 // containing this klass, 0 if not specified.
201 u2 _source_file_name_index;
202 u2 _static_oop_field_count;// number of static oop fields in this klass
203 u2 _java_fields_count; // The number of declared Java fields
204 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
205
206 int _itable_len; // length of Java itable (in words)
207 // _is_marked_dependent can be set concurrently, thus cannot be part of the
208 // _misc_flags.
209 bool _is_marked_dependent; // used for marking during flushing and deoptimization
210
211 public:
212 enum {
213 _extra_is_being_redefined = 1 << 0, // used for locking redefinition
214 _extra_has_value_fields = 1 << 1, // has value fields and related embedded section is not empty
215 _extra_is_bufferable = 1 << 2, // value can be buffered out side of the Java heap
216 _extra_has_vcc_klass = 1 << 3 // has a pointer to its Value Capable Class (MVT)
217 };
218
219 protected:
220 u1 _extra_flags;
221
222 // The low three bits of _misc_flags contains the kind field.
223 // This can be used to quickly discriminate among the five kinds of
224 // InstanceKlass.
225
226 static const unsigned _misc_kind_field_size = 3;
227 static const unsigned _misc_kind_field_pos = 0;
228 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
229
230 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
231 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
232 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
233 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
234 static const unsigned _misc_kind_value_type = 4; // ValueKlass
235
236 // Start after _misc_kind field.
237 enum {
238 _misc_rewritten = 1 << 3, // methods rewritten.
239 _misc_has_nonstatic_fields = 1 << 4, // for sizing with UseCompressedOops
240 _misc_should_verify_class = 1 << 5, // allow caching of preverification
241 _misc_is_anonymous = 1 << 6, // has embedded _host_klass field
242 _misc_is_contended = 1 << 7, // marked with contended annotation
243 _misc_has_nonstatic_concrete_methods = 1 << 8, // class/superclass/implemented interfaces has non-static, concrete methods
244 _misc_declares_nonstatic_concrete_methods = 1 << 9, // directly declares non-static, concrete methods
245 _misc_has_been_redefined = 1 << 10, // class has been redefined
246 _misc_has_passed_fingerprint_check = 1 << 11, // when this class was loaded, the fingerprint computed from its
247 // code source was found to be matching the value recorded by AOT.
248 _misc_is_scratch_class = 1 << 12, // class is the redefined scratch class
249 _misc_is_shared_boot_class = 1 << 13, // defining class loader is boot class loader
250 _misc_is_shared_platform_class = 1 << 14, // defining class loader is platform class loader
251 _misc_is_shared_app_class = 1 << 15 // defining class loader is app class loader
252 };
253 u2 loader_type_bits() {
254 return _misc_is_shared_boot_class|_misc_is_shared_platform_class|_misc_is_shared_app_class;
255 }
256 u2 _misc_flags;
257 u2 _minor_version; // minor version number of class file
258 u2 _major_version; // major version number of class file
259 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
260 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
261 MemberNameTable* _member_names; // Member names
262 JNIid* _jni_ids; // First JNI identifier for static fields in this class
263 jmethodID* volatile _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
264 intptr_t _dep_context; // packed DependencyContext structure
265 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
266 #if INCLUDE_JVMTI
267 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
268 // Linked instanceKlasses of previous versions
269 InstanceKlass* _previous_versions;
270 // JVMTI fields can be moved to their own structure - see 6315920
271 // JVMTI: cached class file, before retransformable agent modified it in CFLH
272 JvmtiCachedClassFileData* _cached_class_file;
273 #endif
274
275 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
276
277 // Class states are defined as ClassState (see above).
278 // Place the _init_state here to utilize the unused 2-byte after
279 // _idnum_allocated_count.
280 u1 _init_state; // state of class
281 u1 _reference_type; // reference type
282
283 #if INCLUDE_JVMTI
284 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
285 #endif
286
287 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
288
289 // Method array.
290 Array<Method*>* _methods;
291 // Default Method Array, concrete methods inherited from interfaces
292 Array<Method*>* _default_methods;
293 // Interface (Klass*s) this class declares locally to implement.
294 Array<Klass*>* _local_interfaces;
295 // Interface (Klass*s) this class implements transitively.
296 Array<Klass*>* _transitive_interfaces;
297 // Int array containing the original order of method in the class file (for JVMTI).
298 Array<int>* _method_ordering;
299 // Int array containing the vtable_indices for default_methods
300 // offset matches _default_methods offset
301 Array<int>* _default_vtable_indices;
302
303 // Instance and static variable information, starts with 6-tuples of shorts
304 // [access, name index, sig index, initval index, low_offset, high_offset]
305 // for all fields, followed by the generic signature data at the end of
306 // the array. Only fields with generic signature attributes have the generic
307 // signature data set in the array. The fields array looks like following:
308 //
309 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
310 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
311 // ...
312 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
313 // [generic signature index]
314 // [generic signature index]
315 // ...
316 Array<u2>* _fields;
317
318 // embedded Java vtable follows here
319 // embedded Java itables follows here
320 // embedded static fields follows here
321 // embedded nonstatic oop-map blocks follows here
322 // embedded implementor of this interface follows here
323 // The embedded implementor only exists if the current klass is an
324 // iterface. The possible values of the implementor fall into following
325 // three cases:
326 // NULL: no implementor.
327 // A Klass* that's not itself: one implementor.
328 // Itself: more than one implementors.
329 // embedded host klass follows here
330 // The embedded host klass only exists in an anonymous class for
331 // dynamic language support (JSR 292 enabled). The host class grants
332 // its access privileges to this class also. The host class is either
333 // named, or a previously loaded anonymous class. A non-anonymous class
334 // or an anonymous class loaded through normal classloading does not
335 // have this embedded field.
336 //
337
338 friend class SystemDictionary;
339
340 public:
341 u2 loader_type() {
342 return _misc_flags & loader_type_bits();
343 }
344
345 bool is_shared_boot_class() const {
346 return (_misc_flags & _misc_is_shared_boot_class) != 0;
347 }
348 bool is_shared_platform_class() const {
349 return (_misc_flags & _misc_is_shared_platform_class) != 0;
350 }
351 bool is_shared_app_class() const {
352 return (_misc_flags & _misc_is_shared_app_class) != 0;
353 }
354
355 void set_class_loader_type(s2 loader_type) {
356 assert(( _misc_flags & loader_type_bits()) == 0,
357 "Should only be called once for each class.");
358 switch (loader_type) {
359 case ClassLoader::BOOT_LOADER:
360 _misc_flags |= _misc_is_shared_boot_class;
361 break;
362 case ClassLoader::PLATFORM_LOADER:
363 _misc_flags |= _misc_is_shared_platform_class;
364 break;
365 case ClassLoader::APP_LOADER:
366 _misc_flags |= _misc_is_shared_app_class;
367 break;
368 default:
369 ShouldNotReachHere();
370 break;
371 }
372 }
373
374 bool has_nonstatic_fields() const {
375 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
376 }
377 void set_has_nonstatic_fields(bool b) {
378 if (b) {
379 _misc_flags |= _misc_has_nonstatic_fields;
380 } else {
381 _misc_flags &= ~_misc_has_nonstatic_fields;
382 }
383 }
384
385 bool has_value_fields() const {
386 return (_extra_flags & _extra_has_value_fields) != 0;
387 }
388 void set_has_value_fields() {
389 _extra_flags |= _extra_has_value_fields;
390 }
391
392 bool has_vcc_klass() const {
393 return (_extra_flags & _extra_has_vcc_klass) != 0;
394 }
395 void set_has_vcc_klass() {
396 _extra_flags |= _extra_has_vcc_klass;
397 }
398
399
400 // field sizes
401 int nonstatic_field_size() const { return _nonstatic_field_size; }
402 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
403
404 int static_field_size() const { return _static_field_size; }
405 void set_static_field_size(int size) { _static_field_size = size; }
406
407 int static_oop_field_count() const { return (int)_static_oop_field_count; }
408 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
409
410 // Java itable
411 int itable_length() const { return _itable_len; }
412 void set_itable_length(int len) { _itable_len = len; }
413
414 // array klasses
415 Klass* array_klasses() const { return _array_klasses; }
416 inline Klass* array_klasses_acquire() const; // load with acquire semantics
417 void set_array_klasses(Klass* k) { _array_klasses = k; }
418 inline void release_set_array_klasses(Klass* k); // store with release semantics
419
420 // methods
421 Array<Method*>* methods() const { return _methods; }
422 void set_methods(Array<Method*>* a) { _methods = a; }
423 Method* method_with_idnum(int idnum);
424 Method* method_with_orig_idnum(int idnum);
425 Method* method_with_orig_idnum(int idnum, int version);
426
427 // method ordering
428 Array<int>* method_ordering() const { return _method_ordering; }
429 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
430 void copy_method_ordering(const intArray* m, TRAPS);
431
432 // default_methods
433 Array<Method*>* default_methods() const { return _default_methods; }
434 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
435
436 // default method vtable_indices
437 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
438 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
439 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
440
441 // interfaces
442 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
443 void set_local_interfaces(Array<Klass*>* a) {
444 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
445 _local_interfaces = a; }
446
447 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
448 void set_transitive_interfaces(Array<Klass*>* a) {
449 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
450 _transitive_interfaces = a;
451 }
452
453 private:
454 friend class fieldDescriptor;
455 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
456
457 public:
458 int field_offset (int index) const { return field(index)->offset(); }
459 int field_access_flags(int index) const { return field(index)->access_flags(); }
460 Symbol* field_name (int index) const { return field(index)->name(constants()); }
461 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
462
463 // Number of Java declared fields
464 int java_fields_count() const { return (int)_java_fields_count; }
465
466 Array<u2>* fields() const { return _fields; }
467 void set_fields(Array<u2>* f, u2 java_fields_count) {
468 guarantee(_fields == NULL || f == NULL, "Just checking");
469 _fields = f;
470 _java_fields_count = java_fields_count;
471 }
472
473 // inner classes
474 Array<u2>* inner_classes() const { return _inner_classes; }
475 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
476
477 enum InnerClassAttributeOffset {
478 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
479 inner_class_inner_class_info_offset = 0,
480 inner_class_outer_class_info_offset = 1,
481 inner_class_inner_name_offset = 2,
482 inner_class_access_flags_offset = 3,
483 inner_class_next_offset = 4
484 };
485
486 enum EnclosingMethodAttributeOffset {
487 enclosing_method_class_index_offset = 0,
488 enclosing_method_method_index_offset = 1,
489 enclosing_method_attribute_size = 2
490 };
491
492 // method override check
493 bool is_override(const methodHandle& super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
494
495 // package
496 PackageEntry* package() const { return _package_entry; }
497 ModuleEntry* module() const;
498 bool in_unnamed_package() const { return (_package_entry == NULL); }
499 void set_package(PackageEntry* p) { _package_entry = p; }
500 void set_package(ClassLoaderData* loader_data, TRAPS);
501 bool is_same_class_package(const Klass* class2) const;
502 bool is_same_class_package(oop classloader2, const Symbol* classname2) const;
503 static bool is_same_class_package(oop class_loader1,
504 const Symbol* class_name1,
505 oop class_loader2,
506 const Symbol* class_name2);
507
508 // find an enclosing class
509 InstanceKlass* compute_enclosing_class(bool* inner_is_member, TRAPS) const;
510
511 // Find InnerClasses attribute and return outer_class_info_index & inner_name_index.
512 bool find_inner_classes_attr(int* ooff, int* noff, TRAPS) const;
513
514 private:
515 // Check prohibited package ("java/" only loadable by boot or platform loaders)
516 static void check_prohibited_package(Symbol* class_name,
517 Handle class_loader,
518 TRAPS);
519 public:
520 // tell if two classes have the same enclosing class (at package level)
521 bool is_same_package_member(const Klass* class2, TRAPS) const;
522
523 // initialization state
524 bool is_loaded() const { return _init_state >= loaded; }
525 bool is_linked() const { return _init_state >= linked; }
526 bool is_initialized() const { return _init_state == fully_initialized; }
527 bool is_not_initialized() const { return _init_state < being_initialized; }
528 bool is_being_initialized() const { return _init_state == being_initialized; }
529 bool is_in_error_state() const { return _init_state == initialization_error; }
530 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
531 ClassState init_state() { return (ClassState)_init_state; }
532 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
533
534 // defineClass specified verification
535 bool should_verify_class() const {
536 return (_misc_flags & _misc_should_verify_class) != 0;
537 }
538 void set_should_verify_class(bool value) {
539 if (value) {
540 _misc_flags |= _misc_should_verify_class;
541 } else {
542 _misc_flags &= ~_misc_should_verify_class;
543 }
544 }
545
546 // marking
547 bool is_marked_dependent() const { return _is_marked_dependent; }
548 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
549
550 static ByteSize extra_flags_offset() { return in_ByteSize(offset_of(InstanceKlass, _extra_flags)); }
551
552 // initialization (virtuals from Klass)
553 bool should_be_initialized() const; // means that initialize should be called
554 void initialize(TRAPS);
555 void link_class(TRAPS);
556 bool link_class_or_fail(TRAPS); // returns false on failure
557 void unlink_class();
558 void rewrite_class(TRAPS);
559 void link_methods(TRAPS);
560 Method* class_initializer() const;
561
562 // set the class to initialized if no static initializer is present
563 void eager_initialize(Thread *thread);
564
565 // reference type
566 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
567 void set_reference_type(ReferenceType t) {
568 assert(t == (u1)t, "overflow");
569 _reference_type = (u1)t;
570 }
571
572 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
573
574 // find local field, returns true if found
575 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
576 // find field in direct superinterfaces, returns the interface in which the field is defined
577 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
578 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
579 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
580 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
581 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
582
583 // find a non-static or static field given its offset within the class.
584 bool contains_field_offset(int offset) {
585 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size(), is_value());
586 }
587
588 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
589 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
590
591 // find a local method (returns NULL if not found)
592 Method* find_method(const Symbol* name, const Symbol* signature) const;
593 static Method* find_method(const Array<Method*>* methods,
594 const Symbol* name,
595 const Symbol* signature);
596
597 // find a local method, but skip static methods
598 Method* find_instance_method(const Symbol* name, const Symbol* signature) const;
599 static Method* find_instance_method(const Array<Method*>* methods,
600 const Symbol* name,
601 const Symbol* signature);
602
603 // find a local method (returns NULL if not found)
604 Method* find_local_method(const Symbol* name,
605 const Symbol* signature,
606 OverpassLookupMode overpass_mode,
607 StaticLookupMode static_mode,
608 PrivateLookupMode private_mode) const;
609
610 // find a local method from given methods array (returns NULL if not found)
611 static Method* find_local_method(const Array<Method*>* methods,
612 const Symbol* name,
613 const Symbol* signature,
614 OverpassLookupMode overpass_mode,
615 StaticLookupMode static_mode,
616 PrivateLookupMode private_mode);
617
618 // find a local method index in methods or default_methods (returns -1 if not found)
619 static int find_method_index(const Array<Method*>* methods,
620 const Symbol* name,
621 const Symbol* signature,
622 OverpassLookupMode overpass_mode,
623 StaticLookupMode static_mode,
624 PrivateLookupMode private_mode);
625
626 // lookup operation (returns NULL if not found)
627 Method* uncached_lookup_method(const Symbol* name,
628 const Symbol* signature,
629 OverpassLookupMode overpass_mode) const;
630
631 // lookup a method in all the interfaces that this class implements
632 // (returns NULL if not found)
633 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
634
635 // lookup a method in local defaults then in all interfaces
636 // (returns NULL if not found)
637 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
638
639 // Find method indices by name. If a method with the specified name is
640 // found the index to the first method is returned, and 'end' is filled in
641 // with the index of first non-name-matching method. If no method is found
642 // -1 is returned.
643 int find_method_by_name(const Symbol* name, int* end) const;
644 static int find_method_by_name(const Array<Method*>* methods,
645 const Symbol* name, int* end);
646
647 // constant pool
648 ConstantPool* constants() const { return _constants; }
649 void set_constants(ConstantPool* c) { _constants = c; }
650
651 // protection domain
652 oop protection_domain() const;
653
654 // signers
655 objArrayOop signers() const;
656
657 // host class
658 InstanceKlass* host_klass() const {
659 InstanceKlass** hk = adr_host_klass();
660 if (hk == NULL) {
661 return NULL;
662 } else {
663 assert(*hk != NULL, "host klass should always be set if the address is not null");
664 return *hk;
665 }
666 }
667 void set_host_klass(const InstanceKlass* host) {
668 assert(is_anonymous(), "not anonymous");
669 const InstanceKlass** addr = (const InstanceKlass **)adr_host_klass();
670 assert(addr != NULL, "no reversed space");
671 if (addr != NULL) {
672 *addr = host;
673 }
674 }
675 bool is_anonymous() const {
676 return (_misc_flags & _misc_is_anonymous) != 0;
677 }
678 void set_is_anonymous(bool value) {
679 if (value) {
680 _misc_flags |= _misc_is_anonymous;
681 } else {
682 _misc_flags &= ~_misc_is_anonymous;
683 }
684 }
685
686 // Oop that keeps the metadata for this class from being unloaded
687 // in places where the metadata is stored in other places, like nmethods
688 oop klass_holder() const {
689 return is_anonymous() ? java_mirror() : class_loader();
690 }
691
692 bool is_contended() const {
693 return (_misc_flags & _misc_is_contended) != 0;
694 }
695 void set_is_contended(bool value) {
696 if (value) {
697 _misc_flags |= _misc_is_contended;
698 } else {
699 _misc_flags &= ~_misc_is_contended;
700 }
701 }
702
703 // source file name
704 Symbol* source_file_name() const {
705 return (_source_file_name_index == 0) ?
706 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
707 }
708 u2 source_file_name_index() const {
709 return _source_file_name_index;
710 }
711 void set_source_file_name_index(u2 sourcefile_index) {
712 _source_file_name_index = sourcefile_index;
713 }
714
715 // minor and major version numbers of class file
716 u2 minor_version() const { return _minor_version; }
717 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
718 u2 major_version() const { return _major_version; }
719 void set_major_version(u2 major_version) { _major_version = major_version; }
720
721 // source debug extension
722 const char* source_debug_extension() const { return _source_debug_extension; }
723 void set_source_debug_extension(const char* array, int length);
724
725 // symbol unloading support (refcount already added)
726 Symbol* array_name() { return _array_name; }
727 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
728
729 // nonstatic oop-map blocks
730 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
731 return oop_map_count * OopMapBlock::size_in_words();
732 }
733 unsigned int nonstatic_oop_map_count() const {
734 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
735 }
736 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
737 void set_nonstatic_oop_map_size(int words) {
738 _nonstatic_oop_map_size = words;
739 }
740
741 #if INCLUDE_JVMTI
742 // Redefinition locking. Class can only be redefined by one thread at a time.
743 bool is_being_redefined() const {
744 return (_extra_flags & _extra_is_being_redefined);
745 }
746 void set_is_being_redefined(bool value) {
747 if (value) {
748 _extra_flags |= _extra_is_being_redefined;
749 } else {
750 _extra_flags &= ~_extra_is_being_redefined;
751 }
752 }
753
754 // RedefineClasses() support for previous versions:
755 void add_previous_version(InstanceKlass* ik, int emcp_method_count);
756 void purge_previous_version_list();
757
758 InstanceKlass* previous_versions() const { return _previous_versions; }
759 #else
760 InstanceKlass* previous_versions() const { return NULL; }
761 #endif
762
763 InstanceKlass* get_klass_version(int version) {
764 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
765 if (ik->constants()->version() == version) {
766 return ik;
767 }
768 }
769 return NULL;
770 }
771
772 bool has_been_redefined() const {
773 return (_misc_flags & _misc_has_been_redefined) != 0;
774 }
775 void set_has_been_redefined() {
776 _misc_flags |= _misc_has_been_redefined;
777 }
778
779 bool has_passed_fingerprint_check() const {
780 return (_misc_flags & _misc_has_passed_fingerprint_check) != 0;
781 }
782 void set_has_passed_fingerprint_check(bool b) {
783 if (b) {
784 _misc_flags |= _misc_has_passed_fingerprint_check;
785 } else {
786 _misc_flags &= ~_misc_has_passed_fingerprint_check;
787 }
788 }
789 bool supers_have_passed_fingerprint_checks();
790
791 static bool should_store_fingerprint();
792 bool has_stored_fingerprint() const;
793 uint64_t get_stored_fingerprint() const;
794 void store_fingerprint(uint64_t fingerprint);
795
796 bool is_scratch_class() const {
797 return (_misc_flags & _misc_is_scratch_class) != 0;
798 }
799
800 void set_is_scratch_class() {
801 _misc_flags |= _misc_is_scratch_class;
802 }
803
804 private:
805
806 void set_kind(unsigned kind) {
807 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
808 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
809 unsigned flags = _misc_flags & ~fmask;
810 _misc_flags = (flags | (kind << _misc_kind_field_pos));
811 }
812
813 bool is_kind(unsigned desired) const {
814 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
815 return kind == desired;
816 }
817
818 public:
819
820 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
821 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
822 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
823 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
824 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
825 bool is_value_type_klass() const { return is_kind(_misc_kind_value_type); }
826
827 #if INCLUDE_JVMTI
828
829 void init_previous_versions() {
830 _previous_versions = NULL;
831 }
832
833 private:
834 static bool _has_previous_versions;
835 public:
836 static void purge_previous_versions(InstanceKlass* ik) {
837 if (ik->has_been_redefined()) {
838 ik->purge_previous_version_list();
839 }
840 }
841
842 static bool has_previous_versions_and_reset();
843
844 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
845 void set_cached_class_file(JvmtiCachedClassFileData *data) {
846 _cached_class_file = data;
847 }
848 JvmtiCachedClassFileData * get_cached_class_file();
849 jint get_cached_class_file_len();
850 unsigned char * get_cached_class_file_bytes();
851
852 // JVMTI: Support for caching of field indices, types, and offsets
853 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
854 _jvmti_cached_class_field_map = descriptor;
855 }
856 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
857 return _jvmti_cached_class_field_map;
858 }
859
860 #if INCLUDE_CDS
861 void set_archived_class_data(JvmtiCachedClassFileData* data) {
862 _cached_class_file = data;
863 }
864
865 JvmtiCachedClassFileData * get_archived_class_data();
866 #endif // INCLUDE_CDS
867 #else // INCLUDE_JVMTI
868
869 static void purge_previous_versions(InstanceKlass* ik) { return; };
870 static bool has_previous_versions_and_reset() { return false; }
871
872 void set_cached_class_file(JvmtiCachedClassFileData *data) {
873 assert(data == NULL, "unexpected call with JVMTI disabled");
874 }
875 JvmtiCachedClassFileData * get_cached_class_file() { return (JvmtiCachedClassFileData *)NULL; }
876
877 #endif // INCLUDE_JVMTI
878
879 bool has_nonstatic_concrete_methods() const {
880 return (_misc_flags & _misc_has_nonstatic_concrete_methods) != 0;
881 }
882 void set_has_nonstatic_concrete_methods(bool b) {
883 if (b) {
884 _misc_flags |= _misc_has_nonstatic_concrete_methods;
885 } else {
886 _misc_flags &= ~_misc_has_nonstatic_concrete_methods;
887 }
888 }
889
890 bool declares_nonstatic_concrete_methods() const {
891 return (_misc_flags & _misc_declares_nonstatic_concrete_methods) != 0;
892 }
893 void set_declares_nonstatic_concrete_methods(bool b) {
894 if (b) {
895 _misc_flags |= _misc_declares_nonstatic_concrete_methods;
896 } else {
897 _misc_flags &= ~_misc_declares_nonstatic_concrete_methods;
898 }
899 }
900
901 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
902 inline u2 next_method_idnum();
903 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
904
905 // generics support
906 Symbol* generic_signature() const {
907 return (_generic_signature_index == 0) ?
908 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
909 }
910 u2 generic_signature_index() const {
911 return _generic_signature_index;
912 }
913 void set_generic_signature_index(u2 sig_index) {
914 _generic_signature_index = sig_index;
915 }
916
917 u2 enclosing_method_data(int offset) const;
918 u2 enclosing_method_class_index() const {
919 return enclosing_method_data(enclosing_method_class_index_offset);
920 }
921 u2 enclosing_method_method_index() {
922 return enclosing_method_data(enclosing_method_method_index_offset);
923 }
924 void set_enclosing_method_indices(u2 class_index,
925 u2 method_index);
926
927 // jmethodID support
928 jmethodID get_jmethod_id(const methodHandle& method_h);
929 jmethodID get_jmethod_id_fetch_or_update(size_t idnum,
930 jmethodID new_id, jmethodID* new_jmeths,
931 jmethodID* to_dealloc_id_p,
932 jmethodID** to_dealloc_jmeths_p);
933 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
934 size_t *length_p, jmethodID* id_p);
935 void ensure_space_for_methodids(int start_offset = 0);
936 jmethodID jmethod_id_or_null(Method* method);
937
938 // annotations support
939 Annotations* annotations() const { return _annotations; }
940 void set_annotations(Annotations* anno) { _annotations = anno; }
941
942 AnnotationArray* class_annotations() const {
943 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
944 }
945 Array<AnnotationArray*>* fields_annotations() const {
946 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
947 }
948 AnnotationArray* class_type_annotations() const {
949 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
950 }
951 Array<AnnotationArray*>* fields_type_annotations() const {
952 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
953 }
954 // allocation
955 instanceOop allocate_instance(TRAPS);
956
957 // additional member function to return a handle
958 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
959
960 objArrayOop allocate_objArray(int n, int length, TRAPS);
961 // Helper function
962 static instanceOop register_finalizer(instanceOop i, TRAPS);
963
964 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
965 // if not, throw either an Error or an Exception.
966 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
967
968 // initialization
969 void call_class_initializer(TRAPS);
970 void set_initialization_state_and_notify(ClassState state, TRAPS);
971
972 // OopMapCache support
973 OopMapCache* oop_map_cache() { return _oop_map_cache; }
974 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
975 void mask_for(const methodHandle& method, int bci, InterpreterOopMap* entry);
976
977 // JNI identifier support (for static fields - for jni performance)
978 JNIid* jni_ids() { return _jni_ids; }
979 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
980 JNIid* jni_id_for(int offset);
981
982 // maintenance of deoptimization dependencies
983 inline DependencyContext dependencies();
984 int mark_dependent_nmethods(KlassDepChange& changes);
985 void add_dependent_nmethod(nmethod* nm);
986 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
987
988 // On-stack replacement support
989 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
990 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
991 void add_osr_nmethod(nmethod* n);
992 bool remove_osr_nmethod(nmethod* n);
993 int mark_osr_nmethods(const Method* m);
994 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
995
996 #if INCLUDE_JVMTI
997 // Breakpoint support (see methods on Method* for details)
998 BreakpointInfo* breakpoints() const { return _breakpoints; };
999 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
1000 #endif
1001
1002 // support for stub routines
1003 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
1004 TRACE_DEFINE_KLASS_TRACE_ID_OFFSET;
1005 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
1006
1007 // subclass/subinterface checks
1008 bool implements_interface(Klass* k) const;
1009 bool is_same_or_direct_interface(Klass* k) const;
1010
1011 #ifdef ASSERT
1012 // check whether this class or one of its superclasses was redefined
1013 bool has_redefined_this_or_super() const;
1014 #endif
1015
1016 // Access to the implementor of an interface.
1017 Klass* implementor() const
1018 {
1019 Klass** k = adr_implementor();
1020 if (k == NULL) {
1021 return NULL;
1022 } else {
1023 return *k;
1024 }
1025 }
1026
1027 void set_implementor(Klass* k) {
1028 assert(is_interface(), "not interface");
1029 Klass** addr = adr_implementor();
1030 assert(addr != NULL, "null addr");
1031 if (addr != NULL) {
1032 *addr = k;
1033 }
1034 }
1035
1036 int nof_implementors() const {
1037 Klass* k = implementor();
1038 if (k == NULL) {
1039 return 0;
1040 } else if (k != this) {
1041 return 1;
1042 } else {
1043 return 2;
1044 }
1045 }
1046
1047 void add_implementor(Klass* k); // k is a new class that implements this interface
1048 void init_implementor(); // initialize
1049
1050 // link this class into the implementors list of every interface it implements
1051 void process_interfaces(Thread *thread);
1052
1053 // virtual operations from Klass
1054 bool is_leaf_class() const { return _subklass == NULL; }
1055 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
1056 bool compute_is_subtype_of(Klass* k);
1057 bool can_be_primary_super_slow() const;
1058 int oop_size(oop obj) const { return size_helper(); }
1059 // slow because it's a virtual call and used for verifying the layout_helper.
1060 // Using the layout_helper bits, we can call is_instance_klass without a virtual call.
1061 DEBUG_ONLY(bool is_instance_klass_slow() const { return true; })
1062
1063 // Iterators
1064 void do_local_static_fields(FieldClosure* cl);
1065 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
1066 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
1067
1068 void methods_do(void f(Method* method));
1069 void array_klasses_do(void f(Klass* k));
1070 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
1071 bool super_types_do(SuperTypeClosure* blk);
1072
1073 static InstanceKlass* cast(Klass* k) {
1074 return const_cast<InstanceKlass*>(cast(const_cast<const Klass*>(k)));
1075 }
1076
1077 static const InstanceKlass* cast(const Klass* k) {
1078 assert(k != NULL, "k should not be null");
1079 assert(k->is_instance_klass(), "cast to InstanceKlass");
1080 return static_cast<const InstanceKlass*>(k);
1081 }
1082
1083 InstanceKlass* java_super() const {
1084 return (super() == NULL) ? NULL : cast(super());
1085 }
1086
1087 // Sizing (in words)
1088 static int header_size() { return sizeof(InstanceKlass)/wordSize; }
1089
1090 static int size(int vtable_length, int itable_length,
1091 int nonstatic_oop_map_size,
1092 bool is_interface, bool is_anonymous, bool has_stored_fingerprint,
1093 int java_fields, bool is_value_type) {
1094 return align_metadata_size(header_size() +
1095 (is_value_type ? (int)sizeof(address) : 0) +
1096 (is_value_type ? (int)sizeof(address) : 0) +
1097 vtable_length +
1098 itable_length +
1099 nonstatic_oop_map_size +
1100 (is_interface ? (int)sizeof(Klass*)/wordSize : 0) +
1101 (is_anonymous ? (int)sizeof(Klass*)/wordSize : 0) +
1102 (has_stored_fingerprint ? (int)sizeof(uint64_t*)/wordSize : 0) +
1103 (java_fields * (int)sizeof(Klass*)/wordSize) +
1104 (is_value_type ? (int)sizeof(Klass*) : 0) +
1105 (is_value_type ? (int)sizeof(intptr_t)*2 : 0));
1106 }
1107 int size() const { return size(vtable_length(),
1108 itable_length(),
1109 nonstatic_oop_map_size(),
1110 is_interface(),
1111 is_anonymous(),
1112 has_stored_fingerprint(),
1113 has_value_fields() ? java_fields_count() : 0,
1114 is_value());
1115 }
1116 #if INCLUDE_SERVICES
1117 virtual void collect_statistics(KlassSizeStats *sz) const;
1118 #endif
1119
1120 intptr_t* start_of_itable() const { return (intptr_t*)start_of_vtable() + (is_value() ? 2 : 0 ) + vtable_length(); }
1121 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
1122
1123 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1124
1125 address static_field_addr(int offset);
1126
1127 bool bounds_check(address addr, bool edge_ok = false, intptr_t size_in_bytes = -1) const PRODUCT_RETURN0;
1128
1129 OopMapBlock* start_of_nonstatic_oop_maps() const {
1130 return (OopMapBlock*)(start_of_itable() + itable_length());
1131 }
1132
1133 Klass** end_of_nonstatic_oop_maps() const {
1134 return (Klass**)(start_of_nonstatic_oop_maps() +
1135 nonstatic_oop_map_count());
1136 }
1137
1138 Klass** adr_implementor() const {
1139 if (is_interface()) {
1140 return (Klass**)end_of_nonstatic_oop_maps();
1141 } else {
1142 return NULL;
1143 }
1144 };
1145
1146 InstanceKlass** adr_host_klass() const {
1147 if (is_anonymous()) {
1148 InstanceKlass** adr_impl = (InstanceKlass **)adr_implementor();
1149 if (adr_impl != NULL) {
1150 return adr_impl + 1;
1151 } else {
1152 return (InstanceKlass **)end_of_nonstatic_oop_maps();
1153 }
1154 } else {
1155 return NULL;
1156 }
1157 }
1158
1159 address adr_fingerprint() const {
1160 if (has_stored_fingerprint()) {
1161 InstanceKlass** adr_host = adr_host_klass();
1162 if (adr_host != NULL) {
1163 return (address)(adr_host + 1);
1164 }
1165
1166 Klass** adr_impl = adr_implementor();
1167 if (adr_impl != NULL) {
1168 return (address)(adr_impl + 1);
1169 }
1170
1171 return (address)end_of_nonstatic_oop_maps();
1172 } else {
1173 return NULL;
1174 }
1175 }
1176
1177 address adr_value_fields_klasses() const {
1178 if (has_value_fields()) {
1179 address adr_fing = adr_fingerprint();
1180 if (adr_fing != NULL) {
1181 return adr_fingerprint() + sizeof(u8);
1182 }
1183
1184 InstanceKlass** adr_host = adr_host_klass();
1185 if (adr_host != NULL) {
1186 return (address)(adr_host + 1);
1187 }
1188
1189 Klass** adr_impl = adr_implementor();
1190 if (adr_impl != NULL) {
1191 return (address)(adr_impl + 1);
1192 }
1193
1194 return (address)end_of_nonstatic_oop_maps();
1195 } else {
1196 return NULL;
1197 }
1198 }
1199
1200 address adr_vcc_klass() const {
1201 if (has_vcc_klass()) {
1202 address adr_jf = adr_value_fields_klasses();
1203 if (adr_jf != NULL) {
1204 return adr_jf + this->java_fields_count() * sizeof(Klass*);
1205 }
1206
1207 address adr_fing = adr_fingerprint();
1208 if (adr_fing != NULL) {
1209 return adr_fingerprint() + sizeof(u8);
1210 }
1211
1212 InstanceKlass** adr_host = adr_host_klass();
1213 if (adr_host != NULL) {
1214 return (address)(adr_host + 1);
1215 }
1216
1217 Klass** adr_impl = adr_implementor();
1218 if (adr_impl != NULL) {
1219 return (address)(adr_impl + 1);
1220 }
1221
1222 return (address)end_of_nonstatic_oop_maps();
1223 } else {
1224 return NULL;
1225 }
1226 }
1227
1228 Klass* get_value_field_klass(int idx) {
1229 assert(has_value_fields(), "Sanity checking");
1230 Klass* k = ((Klass**)adr_value_fields_klasses())[idx];
1231 assert(k != NULL, "Should always be set before being read");
1232 assert(k->is_value(), "Must be a value type");
1233 return k;
1234 }
1235
1236 void set_value_field_klass(int idx, Klass* k) {
1237 assert(has_value_fields(), "Sanity checking");
1238 assert(k != NULL, "Should not be set to NULL");
1239 assert(((Klass**)adr_value_fields_klasses())[idx] == NULL, "Should not be set twice");
1240 ((Klass**)adr_value_fields_klasses())[idx] = k;
1241 }
1242
1243 Klass* get_vcc_klass() const {
1244 if (has_vcc_klass()) {
1245 Klass* k = *(Klass**)adr_vcc_klass();
1246 assert(k == NULL || !k->is_value(), "Must not be a value type");
1247 return k;
1248 }
1249 return NULL;
1250 }
1251
1252 void set_vcc_klass(Klass* k) {
1253 assert(has_vcc_klass(), "Sanity checking");
1254 assert(k == NULL || !k->is_value(), "Must not be a value type");
1255 *(Klass**)adr_vcc_klass()= k;
1256 }
1257
1258 // Use this to return the size of an instance in heap words:
1259 virtual int size_helper() const {
1260 return layout_helper_to_size_helper(layout_helper());
1261 }
1262
1263 // This bit is initialized in classFileParser.cpp.
1264 // It is false under any of the following conditions:
1265 // - the class is abstract (including any interface)
1266 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1267 // - the class size is larger than FastAllocateSizeLimit
1268 // - the class is java/lang/Class, which cannot be allocated directly
1269 bool can_be_fastpath_allocated() const {
1270 return !layout_helper_needs_slow_path(layout_helper());
1271 }
1272
1273 // Java itable
1274 klassItable itable() const; // return klassItable wrapper
1275 Method* method_at_itable(Klass* holder, int index, TRAPS);
1276
1277 #if INCLUDE_JVMTI
1278 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1279 #endif // INCLUDE_JVMTI
1280
1281 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1282 void clean_implementors_list(BoolObjectClosure* is_alive);
1283 void clean_method_data(BoolObjectClosure* is_alive);
1284
1285 // Explicit metaspace deallocation of fields
1286 // For RedefineClasses and class file parsing errors, we need to deallocate
1287 // instanceKlasses and the metadata they point to.
1288 void deallocate_contents(ClassLoaderData* loader_data);
1289 static void deallocate_methods(ClassLoaderData* loader_data,
1290 Array<Method*>* methods);
1291 void static deallocate_interfaces(ClassLoaderData* loader_data,
1292 const Klass* super_klass,
1293 Array<Klass*>* local_interfaces,
1294 Array<Klass*>* transitive_interfaces);
1295
1296 // The constant pool is on stack if any of the methods are executing or
1297 // referenced by handles.
1298 bool on_stack() const { return _constants->on_stack(); }
1299
1300 // callbacks for actions during class unloading
1301 static void notify_unload_class(InstanceKlass* ik);
1302 static void release_C_heap_structures(InstanceKlass* ik);
1303
1304 // Naming
1305 const char* signature_name() const;
1306 static Symbol* package_from_name(const Symbol* name, TRAPS);
1307
1308 // GC specific object visitors
1309 //
1310 #if INCLUDE_ALL_GCS
1311 // Parallel Scavenge
1312 void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
1313 // Parallel Compact
1314 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
1315 void oop_pc_update_pointers(oop obj, ParCompactionManager* cm);
1316 #endif
1317
1318 // Oop fields (and metadata) iterators
1319 // [nv = true] Use non-virtual calls to do_oop_nv.
1320 // [nv = false] Use virtual calls to do_oop.
1321 //
1322 // The InstanceKlass iterators also visits the Object's klass.
1323
1324 // Forward iteration
1325 public:
1326 // Iterate over all oop fields in the oop maps.
1327 template <bool nv, class OopClosureType>
1328 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1329
1330 protected:
1331 // Iterate over all oop fields and metadata.
1332 template <bool nv, class OopClosureType>
1333 inline int oop_oop_iterate(oop obj, OopClosureType* closure);
1334
1335 private:
1336 // Iterate over all oop fields in the oop maps.
1337 // Specialized for [T = oop] or [T = narrowOop].
1338 template <bool nv, typename T, class OopClosureType>
1339 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure);
1340
1341 // Iterate over all oop fields in one oop map.
1342 template <bool nv, typename T, class OopClosureType>
1343 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1344
1345
1346 // Reverse iteration
1347 #if INCLUDE_ALL_GCS
1348 public:
1349 // Iterate over all oop fields in the oop maps.
1350 template <bool nv, class OopClosureType>
1351 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1352
1353 protected:
1354 // Iterate over all oop fields and metadata.
1355 template <bool nv, class OopClosureType>
1356 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1357
1358 private:
1359 // Iterate over all oop fields in the oop maps.
1360 // Specialized for [T = oop] or [T = narrowOop].
1361 template <bool nv, typename T, class OopClosureType>
1362 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure);
1363
1364 // Iterate over all oop fields in one oop map.
1365 template <bool nv, typename T, class OopClosureType>
1366 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1367 #endif
1368
1369
1370 // Bounded range iteration
1371 public:
1372 // Iterate over all oop fields in the oop maps.
1373 template <bool nv, class OopClosureType>
1374 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1375
1376 protected:
1377 // Iterate over all oop fields and metadata.
1378 template <bool nv, class OopClosureType>
1379 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1380
1381 private:
1382 // Iterate over all oop fields in the oop maps.
1383 // Specialized for [T = oop] or [T = narrowOop].
1384 template <bool nv, typename T, class OopClosureType>
1385 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1386
1387 // Iterate over all oop fields in one oop map.
1388 template <bool nv, typename T, class OopClosureType>
1389 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1390
1391
1392 public:
1393
1394 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
1395 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
1396
1397 #if INCLUDE_ALL_GCS
1398 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
1399 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
1400 #endif // INCLUDE_ALL_GCS
1401
1402 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1403
1404 public:
1405 void set_in_error_state() {
1406 assert(DumpSharedSpaces, "only call this when dumping archive");
1407 _init_state = initialization_error;
1408 }
1409 bool check_sharing_error_state();
1410
1411 private:
1412 // initialization state
1413 #ifdef ASSERT
1414 void set_init_state(ClassState state);
1415 #else
1416 void set_init_state(ClassState state) { _init_state = (u1)state; }
1417 #endif
1418 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1419 void set_init_thread(Thread *thread) { _init_thread = thread; }
1420
1421 // The RedefineClasses() API can cause new method idnums to be needed
1422 // which will cause the caches to grow. Safety requires different
1423 // cache management logic if the caches can grow instead of just
1424 // going from NULL to non-NULL.
1425 bool idnum_can_increment() const { return has_been_redefined(); }
1426 inline jmethodID* methods_jmethod_ids_acquire() const;
1427 inline void release_set_methods_jmethod_ids(jmethodID* jmeths);
1428
1429 // Lock during initialization
1430 public:
1431 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1432 // Must be one per class and it has to be a VM internal object so java code
1433 // cannot lock it (like the mirror).
1434 // It has to be an object not a Mutex because it's held through java calls.
1435 oop init_lock() const;
1436 private:
1437 void fence_and_clear_init_lock();
1438
1439 bool link_class_impl (bool throw_verifyerror, TRAPS);
1440 bool verify_code (bool throw_verifyerror, TRAPS);
1441 void initialize_impl (TRAPS);
1442 void initialize_super_interfaces (TRAPS);
1443 void eager_initialize_impl ();
1444 /* jni_id_for_impl for jfieldID only */
1445 JNIid* jni_id_for_impl (int offset);
1446 protected:
1447 // Returns the array class for the n'th dimension
1448 virtual Klass* array_klass_impl(bool or_null, int n, TRAPS);
1449
1450 // Returns the array class with this class as element type
1451 virtual Klass* array_klass_impl(bool or_null, TRAPS);
1452
1453 private:
1454
1455 // find a local method (returns NULL if not found)
1456 Method* find_method_impl(const Symbol* name,
1457 const Symbol* signature,
1458 OverpassLookupMode overpass_mode,
1459 StaticLookupMode static_mode,
1460 PrivateLookupMode private_mode) const;
1461
1462 static Method* find_method_impl(const Array<Method*>* methods,
1463 const Symbol* name,
1464 const Symbol* signature,
1465 OverpassLookupMode overpass_mode,
1466 StaticLookupMode static_mode,
1467 PrivateLookupMode private_mode);
1468
1469 // Free CHeap allocated fields.
1470 void release_C_heap_structures();
1471
1472 #if INCLUDE_JVMTI
1473 // RedefineClasses support
1474 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1475 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1476 #endif
1477 public:
1478 // CDS support - remove and restore oops from metadata. Oops are not shared.
1479 virtual void remove_unshareable_info();
1480 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1481
1482 // jvm support
1483 jint compute_modifier_flags(TRAPS) const;
1484
1485 // JSR-292 support
1486 MemberNameTable* member_names() { return _member_names; }
1487 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; }
1488 oop add_member_name(Handle member_name, bool intern);
1489
1490 //Valhalla prototype DeriveValueType
1491 void create_derive_value_type(Handle class_loader, Handle protection_domain, TRAPS);
1492
1493 public:
1494 // JVMTI support
1495 jint jvmti_class_status() const;
1496
1497 public:
1498 // Printing
1499 #ifndef PRODUCT
1500 void print_on(outputStream* st) const;
1501 #endif
1502 void print_value_on(outputStream* st) const;
1503
1504 void oop_print_value_on(oop obj, outputStream* st);
1505
1506 #ifndef PRODUCT
1507 void oop_print_on (oop obj, outputStream* st);
1508
1509 void print_dependent_nmethods(bool verbose = false);
1510 bool is_dependent_nmethod(nmethod* nm);
1511 #endif
1512
1513 const char* internal_name() const;
1514
1515 // Verification
1516 void verify_on(outputStream* st);
1517
1518 void oop_verify_on(oop obj, outputStream* st);
1519
1520 // Logging
1521 void print_class_load_logging(ClassLoaderData* loader_data,
1522 const char* module_name,
1523 const ClassFileStream* cfs) const;
1524 };
1525
1526 // for adding methods
1527 // UNSET_IDNUM return means no more ids available
1528 inline u2 InstanceKlass::next_method_idnum() {
1529 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1530 return ConstMethod::UNSET_IDNUM; // no more ids available
1531 } else {
1532 return _idnum_allocated_count++;
1533 }
1534 }
1535
1536
1537 /* JNIid class for jfieldIDs only */
1538 class JNIid: public CHeapObj<mtClass> {
1539 friend class VMStructs;
1540 private:
1541 Klass* _holder;
1542 JNIid* _next;
1543 int _offset;
1544 #ifdef ASSERT
1545 bool _is_static_field_id;
1546 #endif
1547
1548 public:
1549 // Accessors
1550 Klass* holder() const { return _holder; }
1551 int offset() const { return _offset; }
1552 JNIid* next() { return _next; }
1553 // Constructor
1554 JNIid(Klass* holder, int offset, JNIid* next);
1555 // Identifier lookup
1556 JNIid* find(int offset);
1557
1558 bool find_local_field(fieldDescriptor* fd) {
1559 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1560 }
1561
1562 static void deallocate(JNIid* id);
1563 // Debugging
1564 #ifdef ASSERT
1565 bool is_static_field_id() const { return _is_static_field_id; }
1566 void set_is_static_field_id() { _is_static_field_id = true; }
1567 #endif
1568 void verify(Klass* holder);
1569 };
1570
1571 // An iterator that's used to access the inner classes indices in the
1572 // InstanceKlass::_inner_classes array.
1573 class InnerClassesIterator : public StackObj {
1574 private:
1575 Array<jushort>* _inner_classes;
1576 int _length;
1577 int _idx;
1578 public:
1579
1580 InnerClassesIterator(const InstanceKlass* k) {
1581 _inner_classes = k->inner_classes();
1582 if (k->inner_classes() != NULL) {
1583 _length = _inner_classes->length();
1584 // The inner class array's length should be the multiple of
1585 // inner_class_next_offset if it only contains the InnerClasses
1586 // attribute data, or it should be
1587 // n*inner_class_next_offset+enclosing_method_attribute_size
1588 // if it also contains the EnclosingMethod data.
1589 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1590 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1591 "just checking");
1592 // Remove the enclosing_method portion if exists.
1593 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1594 _length -= InstanceKlass::enclosing_method_attribute_size;
1595 }
1596 } else {
1597 _length = 0;
1598 }
1599 _idx = 0;
1600 }
1601
1602 int length() const {
1603 return _length;
1604 }
1605
1606 void next() {
1607 _idx += InstanceKlass::inner_class_next_offset;
1608 }
1609
1610 bool done() const {
1611 return (_idx >= _length);
1612 }
1613
1614 u2 inner_class_info_index() const {
1615 return _inner_classes->at(
1616 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1617 }
1618
1619 void set_inner_class_info_index(u2 index) {
1620 _inner_classes->at_put(
1621 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1622 }
1623
1624 u2 outer_class_info_index() const {
1625 return _inner_classes->at(
1626 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1627 }
1628
1629 void set_outer_class_info_index(u2 index) {
1630 _inner_classes->at_put(
1631 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1632 }
1633
1634 u2 inner_name_index() const {
1635 return _inner_classes->at(
1636 _idx + InstanceKlass::inner_class_inner_name_offset);
1637 }
1638
1639 void set_inner_name_index(u2 index) {
1640 _inner_classes->at_put(
1641 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1642 }
1643
1644 u2 inner_access_flags() const {
1645 return _inner_classes->at(
1646 _idx + InstanceKlass::inner_class_access_flags_offset);
1647 }
1648 };
1649
1650 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP