1 /*
2 * Copyright (c) 1997, 2015, 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/classLoaderData.hpp"
29 #include "gc/shared/specialized_oop_closures.hpp"
30 #include "memory/referenceType.hpp"
31 #include "oops/annotations.hpp"
32 #include "oops/constMethod.hpp"
33 #include "oops/fieldInfo.hpp"
34 #include "oops/instanceOop.hpp"
35 #include "oops/klassVtable.hpp"
36 #include "runtime/handles.hpp"
37 #include "runtime/os.hpp"
38 #include "trace/traceMacros.hpp"
39 #include "utilities/accessFlags.hpp"
40 #include "utilities/bitMap.inline.hpp"
41 #include "utilities/macros.hpp"
42
43 // An InstanceKlass is the VM level representation of a Java class.
44 // It contains all information needed for at class at execution runtime.
45
46 // InstanceKlass embedded field layout (after declared fields):
47 // [EMBEDDED Java vtable ] size in words = vtable_len
48 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
49 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
50 // indicating where oops are located in instances of this klass.
51 // [EMBEDDED implementor of the interface] only exist for interface
52 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled)
53
54
55 // forward declaration for class -- see below for definition
56 class SuperTypeClosure;
57 class JNIid;
58 class jniIdMapBase;
59 class BreakpointInfo;
60 class fieldDescriptor;
61 class DepChange;
62 class nmethodBucket;
63 class JvmtiCachedClassFieldMap;
64 class MemberNameTable;
65
66 // This is used in iterators below.
67 class FieldClosure: public StackObj {
68 public:
69 virtual void do_field(fieldDescriptor* fd) = 0;
70 };
71
72 #ifndef PRODUCT
73 // Print fields.
74 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
75 class FieldPrinter: public FieldClosure {
76 oop _obj;
77 outputStream* _st;
78 public:
79 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
80 void do_field(fieldDescriptor* fd);
81 };
82 #endif // !PRODUCT
83
84 // ValueObjs embedded in klass. Describes where oops are located in instances of
85 // this klass.
86 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
87 public:
88 // Byte offset of the first oop mapped by this block.
89 int offset() const { return _offset; }
90 void set_offset(int offset) { _offset = offset; }
91
92 // Number of oops in this block.
93 uint count() const { return _count; }
94 void set_count(uint count) { _count = count; }
95
96 // sizeof(OopMapBlock) in HeapWords.
97 static const int size_in_words() {
98 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
99 LogHeapWordSize;
100 }
101
102 private:
103 int _offset;
104 uint _count;
105 };
106
107 // Utility class to manipulate nmethod dependency context.
108 // The context consists of nmethodBucket* (a head of a linked list)
109 // and a boolean flag (does the list contains stale entries). The structure is
110 // encoded as an intptr_t: lower bit is used for the flag. It is possible since
111 // nmethodBucket* is aligned - the structure is malloc'ed in C heap.
112 // Dependency context can be attached either to an InstanceKlass (_dep_context field)
113 // or CallSiteContext oop for call_site_target dependencies (see javaClasses.hpp).
114 // DependencyContext class operates on some location which holds a intptr_t value.
115 class DependencyContext : public StackObj {
116 friend class VMStructs;
117 private:
118 enum TagBits { _has_unloaded_bit = 1, _has_unloaded_mask = 1 };
119
120 intptr_t* _dependency_context_addr;
121
122 void set_dependencies(nmethodBucket* b) {
123 assert((intptr_t(b) & _has_unloaded_mask) == 0, "should be aligned");
124 if (has_unloaded_dependent()) {
125 *_dependency_context_addr = intptr_t(b) | _has_unloaded_mask;
126 } else {
127 *_dependency_context_addr = intptr_t(b);
128 }
129 }
130
131 void set_has_unloaded_dependent(bool value) {
132 intptr_t b = (intptr_t)dependencies();
133 *_dependency_context_addr = (b | _has_unloaded_mask);
134 }
135
136 public:
137 DependencyContext(intptr_t* addr) : _dependency_context_addr(addr) {}
138
139 static const intptr_t EMPTY = 0; // dependencies = NULL, has_unloaded_dependent = false
140
141 nmethodBucket* dependencies() {
142 intptr_t value = *_dependency_context_addr;
143 return (nmethodBucket*) (value & ~_has_unloaded_mask);
144 }
145
146 bool has_unloaded_dependent() const {
147 intptr_t value = *_dependency_context_addr;
148 return (value & _has_unloaded_mask) != 0;
149 };
150
151 int mark_dependent_nmethods(DepChange& changes);
152 void add_dependent_nmethod(nmethod* nm);
153 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately = false);
154 void purge();
155 int clear();
156
157 #ifndef PRODUCT
158 void print_dependent_nmethods(bool verbose);
159 bool is_dependent_nmethod(nmethod* nm);
160 bool has_stale_entries();
161 void wipe();
162 #endif //PRODUCT
163 };
164
165 struct JvmtiCachedClassFileData;
166
167 class InstanceKlass: public Klass {
168 friend class VMStructs;
169 friend class ClassFileParser;
170 friend class CompileReplay;
171
172 protected:
173 // Constructor
174 InstanceKlass(int vtable_len,
175 int itable_len,
176 int static_field_size,
177 int nonstatic_oop_map_size,
178 unsigned kind,
179 ReferenceType rt,
180 AccessFlags access_flags,
181 bool is_anonymous);
182 public:
183 static InstanceKlass* allocate_instance_klass(
184 ClassLoaderData* loader_data,
185 int vtable_len,
186 int itable_len,
187 int static_field_size,
188 int nonstatic_oop_map_size,
189 ReferenceType rt,
190 AccessFlags access_flags,
191 Symbol* name,
192 Klass* super_klass,
193 bool is_anonymous,
194 TRAPS);
195
196 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
197
198 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
199 // of the class loading & initialization procedure, and the use of the states.
200 enum ClassState {
201 allocated, // allocated (but not yet linked)
202 loaded, // loaded and inserted in class hierarchy (but not linked yet)
203 linked, // successfully linked/verified (but not initialized yet)
204 being_initialized, // currently running class initializer
205 fully_initialized, // initialized (successfull final state)
206 initialization_error // error happened during initialization
207 };
208
209 static int number_of_instance_classes() { return _total_instanceKlass_count; }
210
211 private:
212 static volatile int _total_instanceKlass_count;
213
214 protected:
215 // Annotations for this class
216 Annotations* _annotations;
217 // Array classes holding elements of this class.
218 Klass* _array_klasses;
219 // Constant pool for this class.
220 ConstantPool* _constants;
221 // The InnerClasses attribute and EnclosingMethod attribute. The
222 // _inner_classes is an array of shorts. If the class has InnerClasses
223 // attribute, then the _inner_classes array begins with 4-tuples of shorts
224 // [inner_class_info_index, outer_class_info_index,
225 // inner_name_index, inner_class_access_flags] for the InnerClasses
226 // attribute. If the EnclosingMethod attribute exists, it occupies the
227 // last two shorts [class_index, method_index] of the array. If only
228 // the InnerClasses attribute exists, the _inner_classes array length is
229 // number_of_inner_classes * 4. If the class has both InnerClasses
230 // and EnclosingMethod attributes the _inner_classes array length is
231 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
232 Array<jushort>* _inner_classes;
233
234 // the source debug extension for this klass, NULL if not specified.
235 // Specified as UTF-8 string without terminating zero byte in the classfile,
236 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
237 char* _source_debug_extension;
238 // Array name derived from this class which needs unreferencing
239 // if this class is unloaded.
240 Symbol* _array_name;
241
242 // Number of heapOopSize words used by non-static fields in this klass
243 // (including inherited fields but after header_size()).
244 int _nonstatic_field_size;
245 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
246 // Constant pool index to the utf8 entry of the Generic signature,
247 // or 0 if none.
248 u2 _generic_signature_index;
249 // Constant pool index to the utf8 entry for the name of source file
250 // containing this klass, 0 if not specified.
251 u2 _source_file_name_index;
252 u2 _static_oop_field_count;// number of static oop fields in this klass
253 u2 _java_fields_count; // The number of declared Java fields
254 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
255
256 // _is_marked_dependent can be set concurrently, thus cannot be part of the
257 // _misc_flags.
258 bool _is_marked_dependent; // used for marking during flushing and deoptimization
259
260 // The low two bits of _misc_flags contains the kind field.
261 // This can be used to quickly discriminate among the four kinds of
262 // InstanceKlass.
263
264 static const unsigned _misc_kind_field_size = 2;
265 static const unsigned _misc_kind_field_pos = 0;
266 static const unsigned _misc_kind_field_mask = (1u << _misc_kind_field_size) - 1u;
267
268 static const unsigned _misc_kind_other = 0; // concrete InstanceKlass
269 static const unsigned _misc_kind_reference = 1; // InstanceRefKlass
270 static const unsigned _misc_kind_class_loader = 2; // InstanceClassLoaderKlass
271 static const unsigned _misc_kind_mirror = 3; // InstanceMirrorKlass
272
273 // Start after _misc_kind field.
274 enum {
275 _misc_rewritten = 1 << 2, // methods rewritten.
276 _misc_has_nonstatic_fields = 1 << 3, // for sizing with UseCompressedOops
277 _misc_should_verify_class = 1 << 4, // allow caching of preverification
278 _misc_is_anonymous = 1 << 5, // has embedded _host_klass field
279 _misc_is_contended = 1 << 6, // marked with contended annotation
280 _misc_has_default_methods = 1 << 7, // class/superclass/implemented interfaces has default methods
281 _misc_declares_default_methods = 1 << 8, // directly declares default methods (any access)
282 _misc_has_been_redefined = 1 << 9, // class has been redefined
283 _misc_is_scratch_class = 1 << 10 // class is the redefined scratch class
284 };
285 u2 _misc_flags;
286 u2 _minor_version; // minor version number of class file
287 u2 _major_version; // major version number of class file
288 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
289 int _vtable_len; // length of Java vtable (in words)
290 int _itable_len; // length of Java itable (in words)
291 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
292 MemberNameTable* _member_names; // Member names
293 JNIid* _jni_ids; // First JNI identifier for static fields in this class
294 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
295 intptr_t _dep_context; // packed DependencyContext structure
296 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
297 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
298 // Linked instanceKlasses of previous versions
299 InstanceKlass* _previous_versions;
300 // JVMTI fields can be moved to their own structure - see 6315920
301 // JVMTI: cached class file, before retransformable agent modified it in CFLH
302 JvmtiCachedClassFileData* _cached_class_file;
303
304 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
305
306 // Class states are defined as ClassState (see above).
307 // Place the _init_state here to utilize the unused 2-byte after
308 // _idnum_allocated_count.
309 u1 _init_state; // state of class
310 u1 _reference_type; // reference type
311
312 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
313
314 NOT_PRODUCT(int _verify_count;) // to avoid redundant verifies
315
316 // Method array.
317 Array<Method*>* _methods;
318 // Default Method Array, concrete methods inherited from interfaces
319 Array<Method*>* _default_methods;
320 // Interface (Klass*s) this class declares locally to implement.
321 Array<Klass*>* _local_interfaces;
322 // Interface (Klass*s) this class implements transitively.
323 Array<Klass*>* _transitive_interfaces;
324 // Int array containing the original order of method in the class file (for JVMTI).
325 Array<int>* _method_ordering;
326 // Int array containing the vtable_indices for default_methods
327 // offset matches _default_methods offset
328 Array<int>* _default_vtable_indices;
329
330 // Instance and static variable information, starts with 6-tuples of shorts
331 // [access, name index, sig index, initval index, low_offset, high_offset]
332 // for all fields, followed by the generic signature data at the end of
333 // the array. Only fields with generic signature attributes have the generic
334 // signature data set in the array. The fields array looks like following:
335 //
336 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
337 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
338 // ...
339 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
340 // [generic signature index]
341 // [generic signature index]
342 // ...
343 Array<u2>* _fields;
344
345 // embedded Java vtable follows here
346 // embedded Java itables follows here
347 // embedded static fields follows here
348 // embedded nonstatic oop-map blocks follows here
349 // embedded implementor of this interface follows here
350 // The embedded implementor only exists if the current klass is an
351 // iterface. The possible values of the implementor fall into following
352 // three cases:
353 // NULL: no implementor.
354 // A Klass* that's not itself: one implementor.
355 // Itself: more than one implementors.
356 // embedded host klass follows here
357 // The embedded host klass only exists in an anonymous class for
358 // dynamic language support (JSR 292 enabled). The host class grants
359 // its access privileges to this class also. The host class is either
360 // named, or a previously loaded anonymous class. A non-anonymous class
361 // or an anonymous class loaded through normal classloading does not
362 // have this embedded field.
363 //
364
365 friend class SystemDictionary;
366
367 public:
368 bool has_nonstatic_fields() const {
369 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
370 }
371 void set_has_nonstatic_fields(bool b) {
372 if (b) {
373 _misc_flags |= _misc_has_nonstatic_fields;
374 } else {
375 _misc_flags &= ~_misc_has_nonstatic_fields;
376 }
377 }
378
379 // field sizes
380 int nonstatic_field_size() const { return _nonstatic_field_size; }
381 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
382
383 int static_field_size() const { return _static_field_size; }
384 void set_static_field_size(int size) { _static_field_size = size; }
385
386 int static_oop_field_count() const { return (int)_static_oop_field_count; }
387 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
388
389 // Java vtable
390 int vtable_length() const { return _vtable_len; }
391 void set_vtable_length(int len) { _vtable_len = len; }
392
393 // Java itable
394 int itable_length() const { return _itable_len; }
395 void set_itable_length(int len) { _itable_len = len; }
396
397 // array klasses
398 Klass* array_klasses() const { return _array_klasses; }
399 void set_array_klasses(Klass* k) { _array_klasses = k; }
400
401 // methods
402 Array<Method*>* methods() const { return _methods; }
403 void set_methods(Array<Method*>* a) { _methods = a; }
404 Method* method_with_idnum(int idnum);
405 Method* method_with_orig_idnum(int idnum);
406 Method* method_with_orig_idnum(int idnum, int version);
407
408 // method ordering
409 Array<int>* method_ordering() const { return _method_ordering; }
410 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
411 void copy_method_ordering(intArray* m, TRAPS);
412
413 // default_methods
414 Array<Method*>* default_methods() const { return _default_methods; }
415 void set_default_methods(Array<Method*>* a) { _default_methods = a; }
416
417 // default method vtable_indices
418 Array<int>* default_vtable_indices() const { return _default_vtable_indices; }
419 void set_default_vtable_indices(Array<int>* v) { _default_vtable_indices = v; }
420 Array<int>* create_new_default_vtable_indices(int len, TRAPS);
421
422 // interfaces
423 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
424 void set_local_interfaces(Array<Klass*>* a) {
425 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
426 _local_interfaces = a; }
427
428 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
429 void set_transitive_interfaces(Array<Klass*>* a) {
430 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
431 _transitive_interfaces = a;
432 }
433
434 private:
435 friend class fieldDescriptor;
436 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
437
438 public:
439 int field_offset (int index) const { return field(index)->offset(); }
440 int field_access_flags(int index) const { return field(index)->access_flags(); }
441 Symbol* field_name (int index) const { return field(index)->name(constants()); }
442 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
443
444 // Number of Java declared fields
445 int java_fields_count() const { return (int)_java_fields_count; }
446
447 Array<u2>* fields() const { return _fields; }
448 void set_fields(Array<u2>* f, u2 java_fields_count) {
449 guarantee(_fields == NULL || f == NULL, "Just checking");
450 _fields = f;
451 _java_fields_count = java_fields_count;
452 }
453
454 // inner classes
455 Array<u2>* inner_classes() const { return _inner_classes; }
456 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
457
458 enum InnerClassAttributeOffset {
459 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
460 inner_class_inner_class_info_offset = 0,
461 inner_class_outer_class_info_offset = 1,
462 inner_class_inner_name_offset = 2,
463 inner_class_access_flags_offset = 3,
464 inner_class_next_offset = 4
465 };
466
467 enum EnclosingMethodAttributeOffset {
468 enclosing_method_class_index_offset = 0,
469 enclosing_method_method_index_offset = 1,
470 enclosing_method_attribute_size = 2
471 };
472
473 // method override check
474 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
475
476 // package
477 bool is_same_class_package(Klass* class2);
478 bool is_same_class_package(oop classloader2, Symbol* classname2);
479 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
480
481 // find an enclosing class
482 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) {
483 instanceKlassHandle self(THREAD, this);
484 return compute_enclosing_class_impl(self, inner_is_member, THREAD);
485 }
486 static Klass* compute_enclosing_class_impl(instanceKlassHandle self,
487 bool* inner_is_member, TRAPS);
488
489 // Find InnerClasses attribute for k and return outer_class_info_index & inner_name_index.
490 static bool find_inner_classes_attr(instanceKlassHandle k,
491 int* ooff, int* noff, TRAPS);
492
493 // tell if two classes have the same enclosing class (at package level)
494 bool is_same_package_member(Klass* class2, TRAPS) {
495 instanceKlassHandle self(THREAD, this);
496 return is_same_package_member_impl(self, class2, THREAD);
497 }
498 static bool is_same_package_member_impl(instanceKlassHandle self,
499 Klass* class2, TRAPS);
500
501 // initialization state
502 bool is_loaded() const { return _init_state >= loaded; }
503 bool is_linked() const { return _init_state >= linked; }
504 bool is_initialized() const { return _init_state == fully_initialized; }
505 bool is_not_initialized() const { return _init_state < being_initialized; }
506 bool is_being_initialized() const { return _init_state == being_initialized; }
507 bool is_in_error_state() const { return _init_state == initialization_error; }
508 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
509 ClassState init_state() { return (ClassState)_init_state; }
510 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
511
512 // defineClass specified verification
513 bool should_verify_class() const {
514 return (_misc_flags & _misc_should_verify_class) != 0;
515 }
516 void set_should_verify_class(bool value) {
517 if (value) {
518 _misc_flags |= _misc_should_verify_class;
519 } else {
520 _misc_flags &= ~_misc_should_verify_class;
521 }
522 }
523
524 // marking
525 bool is_marked_dependent() const { return _is_marked_dependent; }
526 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
527
528 // initialization (virtuals from Klass)
529 bool should_be_initialized() const; // means that initialize should be called
530 void initialize(TRAPS);
531 void link_class(TRAPS);
532 bool link_class_or_fail(TRAPS); // returns false on failure
533 void unlink_class();
534 void rewrite_class(TRAPS);
535 void link_methods(TRAPS);
536 Method* class_initializer();
537
538 // set the class to initialized if no static initializer is present
539 void eager_initialize(Thread *thread);
540
541 // reference type
542 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
543 void set_reference_type(ReferenceType t) {
544 assert(t == (u1)t, "overflow");
545 _reference_type = (u1)t;
546 }
547
548 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
549
550 // find local field, returns true if found
551 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
552 // find field in direct superinterfaces, returns the interface in which the field is defined
553 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
554 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
555 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
556 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
557 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
558
559 // find a non-static or static field given its offset within the class.
560 bool contains_field_offset(int offset) {
561 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
562 }
563
564 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
565 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
566
567 // find a local method (returns NULL if not found)
568 Method* find_method(Symbol* name, Symbol* signature) const;
569 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
570
571 // find a local method, but skip static methods
572 Method* find_instance_method(Symbol* name, Symbol* signature);
573 static Method* find_instance_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
574
575 // find a local method (returns NULL if not found)
576 Method* find_local_method(Symbol* name, Symbol* signature,
577 OverpassLookupMode overpass_mode,
578 StaticLookupMode static_mode,
579 PrivateLookupMode private_mode) const;
580
581 // find a local method from given methods array (returns NULL if not found)
582 static Method* find_local_method(Array<Method*>* methods,
583 Symbol* name, Symbol* signature,
584 OverpassLookupMode overpass_mode,
585 StaticLookupMode static_mode,
586 PrivateLookupMode private_mode);
587
588 // true if method matches signature and conforms to skipping_X conditions.
589 static bool method_matches(Method* m, Symbol* signature, bool skipping_overpass, bool skipping_static, bool skipping_private);
590
591 // find a local method index in methods or default_methods (returns -1 if not found)
592 static int find_method_index(Array<Method*>* methods,
593 Symbol* name, Symbol* signature,
594 OverpassLookupMode overpass_mode,
595 StaticLookupMode static_mode,
596 PrivateLookupMode private_mode);
597
598 // lookup operation (returns NULL if not found)
599 Method* uncached_lookup_method(Symbol* name, Symbol* signature, OverpassLookupMode overpass_mode) const;
600
601 // lookup a method in all the interfaces that this class implements
602 // (returns NULL if not found)
603 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature, DefaultsLookupMode defaults_mode) const;
604
605 // lookup a method in local defaults then in all interfaces
606 // (returns NULL if not found)
607 Method* lookup_method_in_ordered_interfaces(Symbol* name, Symbol* signature) const;
608
609 // Find method indices by name. If a method with the specified name is
610 // found the index to the first method is returned, and 'end' is filled in
611 // with the index of first non-name-matching method. If no method is found
612 // -1 is returned.
613 int find_method_by_name(Symbol* name, int* end);
614 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end);
615
616 // constant pool
617 ConstantPool* constants() const { return _constants; }
618 void set_constants(ConstantPool* c) { _constants = c; }
619
620 // protection domain
621 oop protection_domain() const;
622
623 // signers
624 objArrayOop signers() const;
625
626 // host class
627 Klass* host_klass() const {
628 Klass** hk = (Klass**)adr_host_klass();
629 if (hk == NULL) {
630 return NULL;
631 } else {
632 assert(*hk != NULL, "host klass should always be set if the address is not null");
633 return *hk;
634 }
635 }
636 void set_host_klass(Klass* host) {
637 assert(is_anonymous(), "not anonymous");
638 Klass** addr = (Klass**)adr_host_klass();
639 assert(addr != NULL, "no reversed space");
640 if (addr != NULL) {
641 *addr = host;
642 }
643 }
644 bool is_anonymous() const {
645 return (_misc_flags & _misc_is_anonymous) != 0;
646 }
647 void set_is_anonymous(bool value) {
648 if (value) {
649 _misc_flags |= _misc_is_anonymous;
650 } else {
651 _misc_flags &= ~_misc_is_anonymous;
652 }
653 }
654
655 // Oop that keeps the metadata for this class from being unloaded
656 // in places where the metadata is stored in other places, like nmethods
657 oop klass_holder() const {
658 return is_anonymous() ? java_mirror() : class_loader();
659 }
660
661 bool is_contended() const {
662 return (_misc_flags & _misc_is_contended) != 0;
663 }
664 void set_is_contended(bool value) {
665 if (value) {
666 _misc_flags |= _misc_is_contended;
667 } else {
668 _misc_flags &= ~_misc_is_contended;
669 }
670 }
671
672 // source file name
673 Symbol* source_file_name() const {
674 return (_source_file_name_index == 0) ?
675 (Symbol*)NULL : _constants->symbol_at(_source_file_name_index);
676 }
677 u2 source_file_name_index() const {
678 return _source_file_name_index;
679 }
680 void set_source_file_name_index(u2 sourcefile_index) {
681 _source_file_name_index = sourcefile_index;
682 }
683
684 // minor and major version numbers of class file
685 u2 minor_version() const { return _minor_version; }
686 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
687 u2 major_version() const { return _major_version; }
688 void set_major_version(u2 major_version) { _major_version = major_version; }
689
690 // source debug extension
691 char* source_debug_extension() const { return _source_debug_extension; }
692 void set_source_debug_extension(char* array, int length);
693
694 // symbol unloading support (refcount already added)
695 Symbol* array_name() { return _array_name; }
696 void set_array_name(Symbol* name) { assert(_array_name == NULL || name == NULL, "name already created"); _array_name = name; }
697
698 // nonstatic oop-map blocks
699 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
700 return oop_map_count * OopMapBlock::size_in_words();
701 }
702 unsigned int nonstatic_oop_map_count() const {
703 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
704 }
705 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
706 void set_nonstatic_oop_map_size(int words) {
707 _nonstatic_oop_map_size = words;
708 }
709
710 // RedefineClasses() support for previous versions:
711 void add_previous_version(instanceKlassHandle ikh, int emcp_method_count);
712
713 InstanceKlass* previous_versions() const { return _previous_versions; }
714
715 InstanceKlass* get_klass_version(int version) {
716 for (InstanceKlass* ik = this; ik != NULL; ik = ik->previous_versions()) {
717 if (ik->constants()->version() == version) {
718 return ik;
719 }
720 }
721 return NULL;
722 }
723
724 bool has_been_redefined() const {
725 return (_misc_flags & _misc_has_been_redefined) != 0;
726 }
727 void set_has_been_redefined() {
728 _misc_flags |= _misc_has_been_redefined;
729 }
730
731 bool is_scratch_class() const {
732 return (_misc_flags & _misc_is_scratch_class) != 0;
733 }
734
735 void set_is_scratch_class() {
736 _misc_flags |= _misc_is_scratch_class;
737 }
738
739 private:
740
741 void set_kind(unsigned kind) {
742 assert(kind <= _misc_kind_field_mask, "Invalid InstanceKlass kind");
743 unsigned fmask = _misc_kind_field_mask << _misc_kind_field_pos;
744 unsigned flags = _misc_flags & ~fmask;
745 _misc_flags = (flags | (kind << _misc_kind_field_pos));
746 }
747
748 bool is_kind(unsigned desired) const {
749 unsigned kind = (_misc_flags >> _misc_kind_field_pos) & _misc_kind_field_mask;
750 return kind == desired;
751 }
752
753 public:
754
755 // Other is anything that is not one of the more specialized kinds of InstanceKlass.
756 bool is_other_instance_klass() const { return is_kind(_misc_kind_other); }
757 bool is_reference_instance_klass() const { return is_kind(_misc_kind_reference); }
758 bool is_mirror_instance_klass() const { return is_kind(_misc_kind_mirror); }
759 bool is_class_loader_instance_klass() const { return is_kind(_misc_kind_class_loader); }
760
761 void init_previous_versions() {
762 _previous_versions = NULL;
763 }
764
765 private:
766 static int _previous_version_count;
767 public:
768 static void purge_previous_versions(InstanceKlass* ik);
769 static bool has_previous_versions() { return _previous_version_count > 0; }
770
771 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
772 void set_cached_class_file(JvmtiCachedClassFileData *data) {
773 _cached_class_file = data;
774 }
775 JvmtiCachedClassFileData * get_cached_class_file() { return _cached_class_file; }
776 jint get_cached_class_file_len();
777 unsigned char * get_cached_class_file_bytes();
778
779 // JVMTI: Support for caching of field indices, types, and offsets
780 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
781 _jvmti_cached_class_field_map = descriptor;
782 }
783 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
784 return _jvmti_cached_class_field_map;
785 }
786
787 bool has_default_methods() const {
788 return (_misc_flags & _misc_has_default_methods) != 0;
789 }
790 void set_has_default_methods(bool b) {
791 if (b) {
792 _misc_flags |= _misc_has_default_methods;
793 } else {
794 _misc_flags &= ~_misc_has_default_methods;
795 }
796 }
797
798 bool declares_default_methods() const {
799 return (_misc_flags & _misc_declares_default_methods) != 0;
800 }
801 void set_declares_default_methods(bool b) {
802 if (b) {
803 _misc_flags |= _misc_declares_default_methods;
804 } else {
805 _misc_flags &= ~_misc_declares_default_methods;
806 }
807 }
808
809 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
810 inline u2 next_method_idnum();
811 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
812
813 // generics support
814 Symbol* generic_signature() const {
815 return (_generic_signature_index == 0) ?
816 (Symbol*)NULL : _constants->symbol_at(_generic_signature_index);
817 }
818 u2 generic_signature_index() const {
819 return _generic_signature_index;
820 }
821 void set_generic_signature_index(u2 sig_index) {
822 _generic_signature_index = sig_index;
823 }
824
825 u2 enclosing_method_data(int offset);
826 u2 enclosing_method_class_index() {
827 return enclosing_method_data(enclosing_method_class_index_offset);
828 }
829 u2 enclosing_method_method_index() {
830 return enclosing_method_data(enclosing_method_method_index_offset);
831 }
832 void set_enclosing_method_indices(u2 class_index,
833 u2 method_index);
834
835 // jmethodID support
836 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
837 methodHandle method_h);
838 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
839 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
840 jmethodID* to_dealloc_id_p,
841 jmethodID** to_dealloc_jmeths_p);
842 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
843 size_t *length_p, jmethodID* id_p);
844 void ensure_space_for_methodids(int start_offset = 0);
845 jmethodID jmethod_id_or_null(Method* method);
846
847 // annotations support
848 Annotations* annotations() const { return _annotations; }
849 void set_annotations(Annotations* anno) { _annotations = anno; }
850
851 AnnotationArray* class_annotations() const {
852 return (_annotations != NULL) ? _annotations->class_annotations() : NULL;
853 }
854 Array<AnnotationArray*>* fields_annotations() const {
855 return (_annotations != NULL) ? _annotations->fields_annotations() : NULL;
856 }
857 AnnotationArray* class_type_annotations() const {
858 return (_annotations != NULL) ? _annotations->class_type_annotations() : NULL;
859 }
860 Array<AnnotationArray*>* fields_type_annotations() const {
861 return (_annotations != NULL) ? _annotations->fields_type_annotations() : NULL;
862 }
863 // allocation
864 instanceOop allocate_instance(TRAPS);
865
866 // additional member function to return a handle
867 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
868
869 objArrayOop allocate_objArray(int n, int length, TRAPS);
870 // Helper function
871 static instanceOop register_finalizer(instanceOop i, TRAPS);
872
873 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
874 // if not, throw either an Error or an Exception.
875 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
876
877 // initialization
878 void call_class_initializer(TRAPS);
879 void set_initialization_state_and_notify(ClassState state, TRAPS);
880
881 // OopMapCache support
882 OopMapCache* oop_map_cache() { return _oop_map_cache; }
883 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
884 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
885
886 // JNI identifier support (for static fields - for jni performance)
887 JNIid* jni_ids() { return _jni_ids; }
888 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
889 JNIid* jni_id_for(int offset);
890
891 // maintenance of deoptimization dependencies
892 int mark_dependent_nmethods(DepChange& changes);
893 void add_dependent_nmethod(nmethod* nm);
894 void remove_dependent_nmethod(nmethod* nm, bool delete_immediately);
895 void clean_dependent_nmethods();
896
897 // On-stack replacement support
898 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
899 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
900 void add_osr_nmethod(nmethod* n);
901 void remove_osr_nmethod(nmethod* n);
902 int mark_osr_nmethods(const Method* m);
903 nmethod* lookup_osr_nmethod(const Method* m, int bci, int level, bool match_level) const;
904
905 // Breakpoint support (see methods on Method* for details)
906 BreakpointInfo* breakpoints() const { return _breakpoints; };
907 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
908
909 // support for stub routines
910 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
911 TRACE_DEFINE_OFFSET;
912 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
913
914 // subclass/subinterface checks
915 bool implements_interface(Klass* k) const;
916 bool is_same_or_direct_interface(Klass* k) const;
917
918 #ifdef ASSERT
919 // check whether this class or one of its superclasses was redefined
920 bool has_redefined_this_or_super() const;
921 #endif
922
923 // Access to the implementor of an interface.
924 Klass* implementor() const
925 {
926 Klass** k = adr_implementor();
927 if (k == NULL) {
928 return NULL;
929 } else {
930 return *k;
931 }
932 }
933
934 void set_implementor(Klass* k) {
935 assert(is_interface(), "not interface");
936 Klass** addr = adr_implementor();
937 assert(addr != NULL, "null addr");
938 if (addr != NULL) {
939 *addr = k;
940 }
941 }
942
943 int nof_implementors() const {
944 Klass* k = implementor();
945 if (k == NULL) {
946 return 0;
947 } else if (k != this) {
948 return 1;
949 } else {
950 return 2;
951 }
952 }
953
954 void add_implementor(Klass* k); // k is a new class that implements this interface
955 void init_implementor(); // initialize
956
957 // link this class into the implementors list of every interface it implements
958 void process_interfaces(Thread *thread);
959
960 // virtual operations from Klass
961 bool is_leaf_class() const { return _subklass == NULL; }
962 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
963 bool compute_is_subtype_of(Klass* k);
964 bool can_be_primary_super_slow() const;
965 int oop_size(oop obj) const { return size_helper(); }
966 bool oop_is_instance_slow() const { return true; }
967
968 // Iterators
969 void do_local_static_fields(FieldClosure* cl);
970 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
971 void do_local_static_fields(void f(fieldDescriptor*, Handle, TRAPS), Handle, TRAPS);
972
973 void methods_do(void f(Method* method));
974 void array_klasses_do(void f(Klass* k));
975 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
976 bool super_types_do(SuperTypeClosure* blk);
977
978 // Casting from Klass*
979 static InstanceKlass* cast(Klass* k) {
980 assert(k == NULL || k->oop_is_instance(), "cast to InstanceKlass");
981 return static_cast<InstanceKlass*>(k);
982 }
983
984 InstanceKlass* java_super() const {
985 return (super() == NULL) ? NULL : cast(super());
986 }
987
988 // Sizing (in words)
989 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
990
991 static int size(int vtable_length, int itable_length,
992 int nonstatic_oop_map_size,
993 bool is_interface, bool is_anonymous) {
994 return align_object_size(header_size() +
995 align_object_offset(vtable_length) +
996 align_object_offset(itable_length) +
997 ((is_interface || is_anonymous) ?
998 align_object_offset(nonstatic_oop_map_size) :
999 nonstatic_oop_map_size) +
1000 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
1001 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
1002 }
1003 int size() const { return size(vtable_length(),
1004 itable_length(),
1005 nonstatic_oop_map_size(),
1006 is_interface(),
1007 is_anonymous());
1008 }
1009 #if INCLUDE_SERVICES
1010 virtual void collect_statistics(KlassSizeStats *sz) const;
1011 #endif
1012
1013 static int vtable_start_offset() { return header_size(); }
1014 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
1015
1016 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); }
1017 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
1018 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
1019
1020 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
1021
1022 address static_field_addr(int offset);
1023
1024 OopMapBlock* start_of_nonstatic_oop_maps() const {
1025 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
1026 }
1027
1028 Klass** end_of_nonstatic_oop_maps() const {
1029 return (Klass**)(start_of_nonstatic_oop_maps() +
1030 nonstatic_oop_map_count());
1031 }
1032
1033 Klass** adr_implementor() const {
1034 if (is_interface()) {
1035 return (Klass**)end_of_nonstatic_oop_maps();
1036 } else {
1037 return NULL;
1038 }
1039 };
1040
1041 Klass** adr_host_klass() const {
1042 if (is_anonymous()) {
1043 Klass** adr_impl = adr_implementor();
1044 if (adr_impl != NULL) {
1045 return adr_impl + 1;
1046 } else {
1047 return end_of_nonstatic_oop_maps();
1048 }
1049 } else {
1050 return NULL;
1051 }
1052 }
1053
1054 // Use this to return the size of an instance in heap words:
1055 int size_helper() const {
1056 return layout_helper_to_size_helper(layout_helper());
1057 }
1058
1059 // This bit is initialized in classFileParser.cpp.
1060 // It is false under any of the following conditions:
1061 // - the class is abstract (including any interface)
1062 // - the class has a finalizer (if !RegisterFinalizersAtInit)
1063 // - the class size is larger than FastAllocateSizeLimit
1064 // - the class is java/lang/Class, which cannot be allocated directly
1065 bool can_be_fastpath_allocated() const {
1066 return !layout_helper_needs_slow_path(layout_helper());
1067 }
1068
1069 // Java vtable/itable
1070 klassVtable* vtable() const; // return new klassVtable wrapper
1071 inline Method* method_at_vtable(int index);
1072 klassItable* itable() const; // return new klassItable wrapper
1073 Method* method_at_itable(Klass* holder, int index, TRAPS);
1074
1075 #if INCLUDE_JVMTI
1076 void adjust_default_methods(InstanceKlass* holder, bool* trace_name_printed);
1077 #endif // INCLUDE_JVMTI
1078
1079 void clean_weak_instanceklass_links(BoolObjectClosure* is_alive);
1080 void clean_implementors_list(BoolObjectClosure* is_alive);
1081 void clean_method_data(BoolObjectClosure* is_alive);
1082
1083 // Explicit metaspace deallocation of fields
1084 // For RedefineClasses and class file parsing errors, we need to deallocate
1085 // instanceKlasses and the metadata they point to.
1086 void deallocate_contents(ClassLoaderData* loader_data);
1087 static void deallocate_methods(ClassLoaderData* loader_data,
1088 Array<Method*>* methods);
1089 void static deallocate_interfaces(ClassLoaderData* loader_data,
1090 Klass* super_klass,
1091 Array<Klass*>* local_interfaces,
1092 Array<Klass*>* transitive_interfaces);
1093
1094 // The constant pool is on stack if any of the methods are executing or
1095 // referenced by handles.
1096 bool on_stack() const { return _constants->on_stack(); }
1097
1098 // callbacks for actions during class unloading
1099 static void notify_unload_class(InstanceKlass* ik);
1100 static void release_C_heap_structures(InstanceKlass* ik);
1101
1102 // Naming
1103 const char* signature_name() const;
1104
1105 // GC specific object visitors
1106 //
1107 // Mark Sweep
1108 int oop_ms_adjust_pointers(oop obj);
1109 #if INCLUDE_ALL_GCS
1110 // Parallel Scavenge
1111 void oop_ps_push_contents( oop obj, PSPromotionManager* pm);
1112 // Parallel Compact
1113 void oop_pc_follow_contents(oop obj, ParCompactionManager* cm);
1114 void oop_pc_update_pointers(oop obj);
1115 #endif
1116
1117 // Oop fields (and metadata) iterators
1118 // [nv = true] Use non-virtual calls to do_oop_nv.
1119 // [nv = false] Use virtual calls to do_oop.
1120 //
1121 // The InstanceKlass iterators also visits the Object's klass.
1122
1123 // Forward iteration
1124 public:
1125 // Iterate over all oop fields in the oop maps.
1126 template <bool nv, class OopClosureType>
1127 inline void oop_oop_iterate_oop_maps(oop obj, OopClosureType* closure);
1128
1129 protected:
1130 // Iterate over all oop fields and metadata.
1131 template <bool nv, class OopClosureType>
1132 inline int oop_oop_iterate(oop obj, OopClosureType* closure);
1133
1134 private:
1135 // Iterate over all oop fields in the oop maps.
1136 // Specialized for [T = oop] or [T = narrowOop].
1137 template <bool nv, typename T, class OopClosureType>
1138 inline void oop_oop_iterate_oop_maps_specialized(oop obj, OopClosureType* closure);
1139
1140 // Iterate over all oop fields in one oop map.
1141 template <bool nv, typename T, class OopClosureType>
1142 inline void oop_oop_iterate_oop_map(OopMapBlock* map, oop obj, OopClosureType* closure);
1143
1144
1145 // Reverse iteration
1146 #if INCLUDE_ALL_GCS
1147 public:
1148 // Iterate over all oop fields in the oop maps.
1149 template <bool nv, class OopClosureType>
1150 inline void oop_oop_iterate_oop_maps_reverse(oop obj, OopClosureType* closure);
1151
1152 protected:
1153 // Iterate over all oop fields and metadata.
1154 template <bool nv, class OopClosureType>
1155 inline int oop_oop_iterate_reverse(oop obj, OopClosureType* closure);
1156
1157 private:
1158 // Iterate over all oop fields in the oop maps.
1159 // Specialized for [T = oop] or [T = narrowOop].
1160 template <bool nv, typename T, class OopClosureType>
1161 inline void oop_oop_iterate_oop_maps_specialized_reverse(oop obj, OopClosureType* closure);
1162
1163 // Iterate over all oop fields in one oop map.
1164 template <bool nv, typename T, class OopClosureType>
1165 inline void oop_oop_iterate_oop_map_reverse(OopMapBlock* map, oop obj, OopClosureType* closure);
1166 #endif
1167
1168
1169 // Bounded range iteration
1170 public:
1171 // Iterate over all oop fields in the oop maps.
1172 template <bool nv, class OopClosureType>
1173 inline void oop_oop_iterate_oop_maps_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1174
1175 protected:
1176 // Iterate over all oop fields and metadata.
1177 template <bool nv, class OopClosureType>
1178 inline int oop_oop_iterate_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1179
1180 private:
1181 // Iterate over all oop fields in the oop maps.
1182 // Specialized for [T = oop] or [T = narrowOop].
1183 template <bool nv, typename T, class OopClosureType>
1184 inline void oop_oop_iterate_oop_maps_specialized_bounded(oop obj, OopClosureType* closure, MemRegion mr);
1185
1186 // Iterate over all oop fields in one oop map.
1187 template <bool nv, typename T, class OopClosureType>
1188 inline void oop_oop_iterate_oop_map_bounded(OopMapBlock* map, oop obj, OopClosureType* closure, MemRegion mr);
1189
1190
1191 public:
1192
1193 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL)
1194 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL)
1195
1196 #if INCLUDE_ALL_GCS
1197 ALL_OOP_OOP_ITERATE_CLOSURES_1(OOP_OOP_ITERATE_DECL_BACKWARDS)
1198 ALL_OOP_OOP_ITERATE_CLOSURES_2(OOP_OOP_ITERATE_DECL_BACKWARDS)
1199 #endif // INCLUDE_ALL_GCS
1200
1201 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
1202
1203 public:
1204 void set_in_error_state() {
1205 assert(DumpSharedSpaces, "only call this when dumping archive");
1206 _init_state = initialization_error;
1207 }
1208 bool check_sharing_error_state();
1209
1210 private:
1211 // initialization state
1212 #ifdef ASSERT
1213 void set_init_state(ClassState state);
1214 #else
1215 void set_init_state(ClassState state) { _init_state = (u1)state; }
1216 #endif
1217 void set_rewritten() { _misc_flags |= _misc_rewritten; }
1218 void set_init_thread(Thread *thread) { _init_thread = thread; }
1219
1220 // The RedefineClasses() API can cause new method idnums to be needed
1221 // which will cause the caches to grow. Safety requires different
1222 // cache management logic if the caches can grow instead of just
1223 // going from NULL to non-NULL.
1224 bool idnum_can_increment() const { return has_been_redefined(); }
1225 jmethodID* methods_jmethod_ids_acquire() const
1226 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
1227 void release_set_methods_jmethod_ids(jmethodID* jmeths)
1228 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
1229
1230 // Lock during initialization
1231 public:
1232 // Lock for (1) initialization; (2) access to the ConstantPool of this class.
1233 // Must be one per class and it has to be a VM internal object so java code
1234 // cannot lock it (like the mirror).
1235 // It has to be an object not a Mutex because it's held through java calls.
1236 oop init_lock() const;
1237 private:
1238 void fence_and_clear_init_lock();
1239
1240 // Static methods that are used to implement member methods where an exposed this pointer
1241 // is needed due to possible GCs
1242 static bool link_class_impl (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS);
1243 static bool verify_code (instanceKlassHandle this_k, bool throw_verifyerror, TRAPS);
1244 static void initialize_impl (instanceKlassHandle this_k, TRAPS);
1245 static void initialize_super_interfaces (instanceKlassHandle this_k, TRAPS);
1246 static void eager_initialize_impl (instanceKlassHandle this_k);
1247 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_k, ClassState state, TRAPS);
1248 static void call_class_initializer_impl (instanceKlassHandle this_k, TRAPS);
1249 static Klass* array_klass_impl (instanceKlassHandle this_k, bool or_null, int n, TRAPS);
1250 static void do_local_static_fields_impl (instanceKlassHandle this_k, void f(fieldDescriptor* fd, Handle, TRAPS), Handle, TRAPS);
1251 /* jni_id_for_impl for jfieldID only */
1252 static JNIid* jni_id_for_impl (instanceKlassHandle this_k, int offset);
1253
1254 // Returns the array class for the n'th dimension
1255 Klass* array_klass_impl(bool or_null, int n, TRAPS);
1256
1257 // Returns the array class with this class as element type
1258 Klass* array_klass_impl(bool or_null, TRAPS);
1259
1260 // find a local method (returns NULL if not found)
1261 Method* find_method_impl(Symbol* name, Symbol* signature,
1262 OverpassLookupMode overpass_mode,
1263 StaticLookupMode static_mode,
1264 PrivateLookupMode private_mode) const;
1265 static Method* find_method_impl(Array<Method*>* methods,
1266 Symbol* name, Symbol* signature,
1267 OverpassLookupMode overpass_mode,
1268 StaticLookupMode static_mode,
1269 PrivateLookupMode private_mode);
1270
1271 // Free CHeap allocated fields.
1272 void release_C_heap_structures();
1273
1274 // RedefineClasses support
1275 void link_previous_versions(InstanceKlass* pv) { _previous_versions = pv; }
1276 void mark_newly_obsolete_methods(Array<Method*>* old_methods, int emcp_method_count);
1277 public:
1278 // CDS support - remove and restore oops from metadata. Oops are not shared.
1279 virtual void remove_unshareable_info();
1280 virtual void restore_unshareable_info(ClassLoaderData* loader_data, Handle protection_domain, TRAPS);
1281
1282 // jvm support
1283 jint compute_modifier_flags(TRAPS) const;
1284
1285 // JSR-292 support
1286 MemberNameTable* member_names() { return _member_names; }
1287 void set_member_names(MemberNameTable* member_names) { _member_names = member_names; }
1288 bool add_member_name(Handle member_name);
1289
1290 public:
1291 // JVMTI support
1292 jint jvmti_class_status() const;
1293
1294 public:
1295 // Printing
1296 #ifndef PRODUCT
1297 void print_on(outputStream* st) const;
1298 #endif
1299 void print_value_on(outputStream* st) const;
1300
1301 void oop_print_value_on(oop obj, outputStream* st);
1302
1303 #ifndef PRODUCT
1304 void oop_print_on (oop obj, outputStream* st);
1305
1306 void print_dependent_nmethods(bool verbose = false);
1307 bool is_dependent_nmethod(nmethod* nm);
1308 #endif
1309
1310 const char* internal_name() const;
1311
1312 // Verification
1313 void verify_on(outputStream* st);
1314
1315 void oop_verify_on(oop obj, outputStream* st);
1316 };
1317
1318 inline Method* InstanceKlass::method_at_vtable(int index) {
1319 #ifndef PRODUCT
1320 assert(index >= 0, "valid vtable index");
1321 if (DebugVtables) {
1322 verify_vtable_index(index);
1323 }
1324 #endif
1325 vtableEntry* ve = (vtableEntry*)start_of_vtable();
1326 return ve[index].method();
1327 }
1328
1329 // for adding methods
1330 // UNSET_IDNUM return means no more ids available
1331 inline u2 InstanceKlass::next_method_idnum() {
1332 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1333 return ConstMethod::UNSET_IDNUM; // no more ids available
1334 } else {
1335 return _idnum_allocated_count++;
1336 }
1337 }
1338
1339
1340 /* JNIid class for jfieldIDs only */
1341 class JNIid: public CHeapObj<mtClass> {
1342 friend class VMStructs;
1343 private:
1344 Klass* _holder;
1345 JNIid* _next;
1346 int _offset;
1347 #ifdef ASSERT
1348 bool _is_static_field_id;
1349 #endif
1350
1351 public:
1352 // Accessors
1353 Klass* holder() const { return _holder; }
1354 int offset() const { return _offset; }
1355 JNIid* next() { return _next; }
1356 // Constructor
1357 JNIid(Klass* holder, int offset, JNIid* next);
1358 // Identifier lookup
1359 JNIid* find(int offset);
1360
1361 bool find_local_field(fieldDescriptor* fd) {
1362 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1363 }
1364
1365 static void deallocate(JNIid* id);
1366 // Debugging
1367 #ifdef ASSERT
1368 bool is_static_field_id() const { return _is_static_field_id; }
1369 void set_is_static_field_id() { _is_static_field_id = true; }
1370 #endif
1371 void verify(Klass* holder);
1372 };
1373
1374
1375 //
1376 // nmethodBucket is used to record dependent nmethods for
1377 // deoptimization. nmethod dependencies are actually <klass, method>
1378 // pairs but we really only care about the klass part for purposes of
1379 // finding nmethods which might need to be deoptimized. Instead of
1380 // recording the method, a count of how many times a particular nmethod
1381 // was recorded is kept. This ensures that any recording errors are
1382 // noticed since an nmethod should be removed as many times are it's
1383 // added.
1384 //
1385 class nmethodBucket: public CHeapObj<mtClass> {
1386 friend class VMStructs;
1387 private:
1388 nmethod* _nmethod;
1389 int _count;
1390 nmethodBucket* _next;
1391
1392 public:
1393 nmethodBucket(nmethod* nmethod, nmethodBucket* next) :
1394 _nmethod(nmethod), _next(next), _count(1) {}
1395
1396 int count() { return _count; }
1397 int increment() { _count += 1; return _count; }
1398 int decrement();
1399 nmethodBucket* next() { return _next; }
1400 void set_next(nmethodBucket* b) { _next = b; }
1401 nmethod* get_nmethod() { return _nmethod; }
1402 };
1403
1404 // An iterator that's used to access the inner classes indices in the
1405 // InstanceKlass::_inner_classes array.
1406 class InnerClassesIterator : public StackObj {
1407 private:
1408 Array<jushort>* _inner_classes;
1409 int _length;
1410 int _idx;
1411 public:
1412
1413 InnerClassesIterator(instanceKlassHandle k) {
1414 _inner_classes = k->inner_classes();
1415 if (k->inner_classes() != NULL) {
1416 _length = _inner_classes->length();
1417 // The inner class array's length should be the multiple of
1418 // inner_class_next_offset if it only contains the InnerClasses
1419 // attribute data, or it should be
1420 // n*inner_class_next_offset+enclosing_method_attribute_size
1421 // if it also contains the EnclosingMethod data.
1422 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1423 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1424 "just checking");
1425 // Remove the enclosing_method portion if exists.
1426 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1427 _length -= InstanceKlass::enclosing_method_attribute_size;
1428 }
1429 } else {
1430 _length = 0;
1431 }
1432 _idx = 0;
1433 }
1434
1435 int length() const {
1436 return _length;
1437 }
1438
1439 void next() {
1440 _idx += InstanceKlass::inner_class_next_offset;
1441 }
1442
1443 bool done() const {
1444 return (_idx >= _length);
1445 }
1446
1447 u2 inner_class_info_index() const {
1448 return _inner_classes->at(
1449 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1450 }
1451
1452 void set_inner_class_info_index(u2 index) {
1453 _inner_classes->at_put(
1454 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1455 }
1456
1457 u2 outer_class_info_index() const {
1458 return _inner_classes->at(
1459 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1460 }
1461
1462 void set_outer_class_info_index(u2 index) {
1463 _inner_classes->at_put(
1464 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1465 }
1466
1467 u2 inner_name_index() const {
1468 return _inner_classes->at(
1469 _idx + InstanceKlass::inner_class_inner_name_offset);
1470 }
1471
1472 void set_inner_name_index(u2 index) {
1473 _inner_classes->at_put(
1474 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1475 }
1476
1477 u2 inner_access_flags() const {
1478 return _inner_classes->at(
1479 _idx + InstanceKlass::inner_class_access_flags_offset);
1480 }
1481 };
1482
1483 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP