Thu, 11 Oct 2012 12:25:42 -0400
7200776: Implement default methods in interfaces
Summary: Add generic type analysis and default method selection algorithms
Reviewed-by: coleenp, acorn
1 /*
2 * Copyright (c) 1997, 2012, 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.
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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
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23 */
25 #ifndef SHARE_VM_OOPS_INSTANCEKLASS_HPP
26 #define SHARE_VM_OOPS_INSTANCEKLASS_HPP
28 #include "classfile/classLoaderData.hpp"
29 #include "oops/annotations.hpp"
30 #include "oops/constMethod.hpp"
31 #include "oops/fieldInfo.hpp"
32 #include "oops/instanceOop.hpp"
33 #include "oops/klassVtable.hpp"
34 #include "runtime/handles.hpp"
35 #include "runtime/os.hpp"
36 #include "utilities/accessFlags.hpp"
37 #include "utilities/bitMap.inline.hpp"
39 // An InstanceKlass is the VM level representation of a Java class.
40 // It contains all information needed for at class at execution runtime.
42 // InstanceKlass layout:
43 // [C++ vtbl pointer ] Klass
44 // [subtype cache ] Klass
45 // [instance size ] Klass
46 // [java mirror ] Klass
47 // [super ] Klass
48 // [access_flags ] Klass
49 // [name ] Klass
50 // [first subklass ] Klass
51 // [next sibling ] Klass
52 // [array klasses ]
53 // [methods ]
54 // [local interfaces ]
55 // [transitive interfaces ]
56 // [fields ]
57 // [constants ]
58 // [class loader ]
59 // [protection domain ]
60 // [signers ]
61 // [source file name ]
62 // [inner classes ]
63 // [static field size ]
64 // [nonstatic field size ]
65 // [static oop fields size ]
66 // [nonstatic oop maps size ]
67 // [has finalize method ]
68 // [deoptimization mark bit ]
69 // [initialization state ]
70 // [initializing thread ]
71 // [Java vtable length ]
72 // [oop map cache (stack maps) ]
73 // [EMBEDDED Java vtable ] size in words = vtable_len
74 // [EMBEDDED nonstatic oop-map blocks] size in words = nonstatic_oop_map_size
75 // The embedded nonstatic oop-map blocks are short pairs (offset, length)
76 // indicating where oops are located in instances of this klass.
77 // [EMBEDDED implementor of the interface] only exist for interface
78 // [EMBEDDED host klass ] only exist for an anonymous class (JSR 292 enabled)
81 // forward declaration for class -- see below for definition
82 class SuperTypeClosure;
83 class JNIid;
84 class jniIdMapBase;
85 class BreakpointInfo;
86 class fieldDescriptor;
87 class DepChange;
88 class nmethodBucket;
89 class PreviousVersionNode;
90 class JvmtiCachedClassFieldMap;
92 // This is used in iterators below.
93 class FieldClosure: public StackObj {
94 public:
95 virtual void do_field(fieldDescriptor* fd) = 0;
96 };
98 #ifndef PRODUCT
99 // Print fields.
100 // If "obj" argument to constructor is NULL, prints static fields, otherwise prints non-static fields.
101 class FieldPrinter: public FieldClosure {
102 oop _obj;
103 outputStream* _st;
104 public:
105 FieldPrinter(outputStream* st, oop obj = NULL) : _obj(obj), _st(st) {}
106 void do_field(fieldDescriptor* fd);
107 };
108 #endif // !PRODUCT
110 // ValueObjs embedded in klass. Describes where oops are located in instances of
111 // this klass.
112 class OopMapBlock VALUE_OBJ_CLASS_SPEC {
113 public:
114 // Byte offset of the first oop mapped by this block.
115 int offset() const { return _offset; }
116 void set_offset(int offset) { _offset = offset; }
118 // Number of oops in this block.
119 uint count() const { return _count; }
120 void set_count(uint count) { _count = count; }
122 // sizeof(OopMapBlock) in HeapWords.
123 static const int size_in_words() {
124 return align_size_up(int(sizeof(OopMapBlock)), HeapWordSize) >>
125 LogHeapWordSize;
126 }
128 private:
129 int _offset;
130 uint _count;
131 };
133 class InstanceKlass: public Klass {
134 friend class VMStructs;
135 friend class ClassFileParser;
137 protected:
138 // Constructor
139 InstanceKlass(int vtable_len,
140 int itable_len,
141 int static_field_size,
142 int nonstatic_oop_map_size,
143 ReferenceType rt,
144 AccessFlags access_flags,
145 bool is_anonymous);
146 public:
147 static Klass* allocate_instance_klass(ClassLoaderData* loader_data,
148 int vtable_len,
149 int itable_len,
150 int static_field_size,
151 int nonstatic_oop_map_size,
152 ReferenceType rt,
153 AccessFlags access_flags,
154 Symbol* name,
155 Klass* super_klass,
156 KlassHandle host_klass,
157 TRAPS);
159 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
161 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
162 // of the class loading & initialization procedure, and the use of the states.
163 enum ClassState {
164 allocated, // allocated (but not yet linked)
165 loaded, // loaded and inserted in class hierarchy (but not linked yet)
166 linked, // successfully linked/verified (but not initialized yet)
167 being_initialized, // currently running class initializer
168 fully_initialized, // initialized (successfull final state)
169 initialization_error // error happened during initialization
170 };
172 protected:
173 // Protection domain.
174 oop _protection_domain;
175 // Class signers.
176 objArrayOop _signers;
177 // Initialization lock. Must be one per class and it has to be a VM internal
178 // object so java code cannot lock it (like the mirror)
179 // It has to be an object not a Mutex because it's held through java calls.
180 volatile oop _init_lock;
182 // Annotations for this class
183 Annotations* _annotations;
184 // Array classes holding elements of this class.
185 Klass* _array_klasses;
186 // Constant pool for this class.
187 ConstantPool* _constants;
188 // The InnerClasses attribute and EnclosingMethod attribute. The
189 // _inner_classes is an array of shorts. If the class has InnerClasses
190 // attribute, then the _inner_classes array begins with 4-tuples of shorts
191 // [inner_class_info_index, outer_class_info_index,
192 // inner_name_index, inner_class_access_flags] for the InnerClasses
193 // attribute. If the EnclosingMethod attribute exists, it occupies the
194 // last two shorts [class_index, method_index] of the array. If only
195 // the InnerClasses attribute exists, the _inner_classes array length is
196 // number_of_inner_classes * 4. If the class has both InnerClasses
197 // and EnclosingMethod attributes the _inner_classes array length is
198 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
199 Array<jushort>* _inner_classes;
201 // Name of source file containing this klass, NULL if not specified.
202 Symbol* _source_file_name;
203 // the source debug extension for this klass, NULL if not specified.
204 // Specified as UTF-8 string without terminating zero byte in the classfile,
205 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
206 char* _source_debug_extension;
207 // Generic signature, or null if none.
208 Symbol* _generic_signature;
209 // Array name derived from this class which needs unreferencing
210 // if this class is unloaded.
211 Symbol* _array_name;
213 // Number of heapOopSize words used by non-static fields in this klass
214 // (including inherited fields but after header_size()).
215 int _nonstatic_field_size;
216 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
217 u2 _static_oop_field_count;// number of static oop fields in this klass
218 u2 _java_fields_count; // The number of declared Java fields
219 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
221 bool _is_marked_dependent; // used for marking during flushing and deoptimization
222 enum {
223 _misc_rewritten = 1 << 0, // methods rewritten.
224 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops
225 _misc_should_verify_class = 1 << 2, // allow caching of preverification
226 _misc_is_anonymous = 1 << 3 // has embedded _inner_classes field
227 };
228 u2 _misc_flags;
229 u2 _minor_version; // minor version number of class file
230 u2 _major_version; // major version number of class file
231 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
232 int _vtable_len; // length of Java vtable (in words)
233 int _itable_len; // length of Java itable (in words)
234 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
235 JNIid* _jni_ids; // First JNI identifier for static fields in this class
236 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
237 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL
238 nmethodBucket* _dependencies; // list of dependent nmethods
239 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
240 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
241 // Array of interesting part(s) of the previous version(s) of this
242 // InstanceKlass. See PreviousVersionWalker below.
243 GrowableArray<PreviousVersionNode *>* _previous_versions;
244 // JVMTI fields can be moved to their own structure - see 6315920
245 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH
246 jint _cached_class_file_len; // JVMTI: length of above
247 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
249 // true if class, superclass, or implemented interfaces have default methods
250 bool _has_default_methods;
252 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
253 // Method array.
254 Array<Method*>* _methods;
255 // Interface (Klass*s) this class declares locally to implement.
256 Array<Klass*>* _local_interfaces;
257 // Interface (Klass*s) this class implements transitively.
258 Array<Klass*>* _transitive_interfaces;
259 // Int array containing the original order of method in the class file (for JVMTI).
260 Array<int>* _method_ordering;
261 // Instance and static variable information, starts with 6-tuples of shorts
262 // [access, name index, sig index, initval index, low_offset, high_offset]
263 // for all fields, followed by the generic signature data at the end of
264 // the array. Only fields with generic signature attributes have the generic
265 // signature data set in the array. The fields array looks like following:
266 //
267 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
268 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
269 // ...
270 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
271 // [generic signature index]
272 // [generic signature index]
273 // ...
274 Array<u2>* _fields;
276 // Class states are defined as ClassState (see above).
277 // Place the _init_state here to utilize the unused 2-byte after
278 // _idnum_allocated_count.
279 u1 _init_state; // state of class
281 u1 _reference_type; // reference type
283 // embedded Java vtable follows here
284 // embedded Java itables follows here
285 // embedded static fields follows here
286 // embedded nonstatic oop-map blocks follows here
287 // embedded implementor of this interface follows here
288 // The embedded implementor only exists if the current klass is an
289 // iterface. The possible values of the implementor fall into following
290 // three cases:
291 // NULL: no implementor.
292 // A Klass* that's not itself: one implementor.
293 // Itsef: more than one implementors.
294 // embedded host klass follows here
295 // The embedded host klass only exists in an anonymous class for
296 // dynamic language support (JSR 292 enabled). The host class grants
297 // its access privileges to this class also. The host class is either
298 // named, or a previously loaded anonymous class. A non-anonymous class
299 // or an anonymous class loaded through normal classloading does not
300 // have this embedded field.
301 //
303 friend class SystemDictionary;
305 public:
306 bool has_nonstatic_fields() const {
307 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
308 }
309 void set_has_nonstatic_fields(bool b) {
310 if (b) {
311 _misc_flags |= _misc_has_nonstatic_fields;
312 } else {
313 _misc_flags &= ~_misc_has_nonstatic_fields;
314 }
315 }
317 // field sizes
318 int nonstatic_field_size() const { return _nonstatic_field_size; }
319 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
321 int static_field_size() const { return _static_field_size; }
322 void set_static_field_size(int size) { _static_field_size = size; }
324 int static_oop_field_count() const { return (int)_static_oop_field_count; }
325 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
327 // Java vtable
328 int vtable_length() const { return _vtable_len; }
329 void set_vtable_length(int len) { _vtable_len = len; }
331 // Java itable
332 int itable_length() const { return _itable_len; }
333 void set_itable_length(int len) { _itable_len = len; }
335 // array klasses
336 Klass* array_klasses() const { return _array_klasses; }
337 void set_array_klasses(Klass* k) { _array_klasses = k; }
339 // methods
340 Array<Method*>* methods() const { return _methods; }
341 void set_methods(Array<Method*>* a) { _methods = a; }
342 Method* method_with_idnum(int idnum);
344 // method ordering
345 Array<int>* method_ordering() const { return _method_ordering; }
346 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
348 // interfaces
349 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
350 void set_local_interfaces(Array<Klass*>* a) {
351 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
352 _local_interfaces = a; }
353 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
354 void set_transitive_interfaces(Array<Klass*>* a) {
355 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
356 _transitive_interfaces = a; }
358 private:
359 friend class fieldDescriptor;
360 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
362 public:
363 int field_offset (int index) const { return field(index)->offset(); }
364 int field_access_flags(int index) const { return field(index)->access_flags(); }
365 Symbol* field_name (int index) const { return field(index)->name(constants()); }
366 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
368 // Number of Java declared fields
369 int java_fields_count() const { return (int)_java_fields_count; }
371 Array<u2>* fields() const { return _fields; }
373 void set_fields(Array<u2>* f, u2 java_fields_count) {
374 guarantee(_fields == NULL || f == NULL, "Just checking");
375 _fields = f;
376 _java_fields_count = java_fields_count;
377 }
379 // inner classes
380 Array<u2>* inner_classes() const { return _inner_classes; }
381 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
383 enum InnerClassAttributeOffset {
384 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
385 inner_class_inner_class_info_offset = 0,
386 inner_class_outer_class_info_offset = 1,
387 inner_class_inner_name_offset = 2,
388 inner_class_access_flags_offset = 3,
389 inner_class_next_offset = 4
390 };
392 enum EnclosingMethodAttributeOffset {
393 enclosing_method_class_index_offset = 0,
394 enclosing_method_method_index_offset = 1,
395 enclosing_method_attribute_size = 2
396 };
398 // method override check
399 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
401 // package
402 bool is_same_class_package(Klass* class2);
403 bool is_same_class_package(oop classloader2, Symbol* classname2);
404 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
406 // find an enclosing class (defined where original code was, in jvm.cpp!)
407 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) {
408 instanceKlassHandle self(THREAD, this);
409 return compute_enclosing_class_impl(self, inner_is_member, THREAD);
410 }
411 static Klass* compute_enclosing_class_impl(instanceKlassHandle self,
412 bool* inner_is_member, TRAPS);
414 // tell if two classes have the same enclosing class (at package level)
415 bool is_same_package_member(Klass* class2, TRAPS) {
416 instanceKlassHandle self(THREAD, this);
417 return is_same_package_member_impl(self, class2, THREAD);
418 }
419 static bool is_same_package_member_impl(instanceKlassHandle self,
420 Klass* class2, TRAPS);
422 // initialization state
423 bool is_loaded() const { return _init_state >= loaded; }
424 bool is_linked() const { return _init_state >= linked; }
425 bool is_initialized() const { return _init_state == fully_initialized; }
426 bool is_not_initialized() const { return _init_state < being_initialized; }
427 bool is_being_initialized() const { return _init_state == being_initialized; }
428 bool is_in_error_state() const { return _init_state == initialization_error; }
429 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
430 ClassState init_state() { return (ClassState)_init_state; }
431 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
433 // defineClass specified verification
434 bool should_verify_class() const {
435 return (_misc_flags & _misc_should_verify_class) != 0;
436 }
437 void set_should_verify_class(bool value) {
438 if (value) {
439 _misc_flags |= _misc_should_verify_class;
440 } else {
441 _misc_flags &= ~_misc_should_verify_class;
442 }
443 }
445 // marking
446 bool is_marked_dependent() const { return _is_marked_dependent; }
447 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
449 // initialization (virtuals from Klass)
450 bool should_be_initialized() const; // means that initialize should be called
451 void initialize(TRAPS);
452 void link_class(TRAPS);
453 bool link_class_or_fail(TRAPS); // returns false on failure
454 void unlink_class();
455 void rewrite_class(TRAPS);
456 void relocate_and_link_methods(TRAPS);
457 Method* class_initializer();
459 // set the class to initialized if no static initializer is present
460 void eager_initialize(Thread *thread);
462 // reference type
463 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
464 void set_reference_type(ReferenceType t) {
465 assert(t == (u1)t, "overflow");
466 _reference_type = (u1)t;
467 }
469 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
471 // find local field, returns true if found
472 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
473 // find field in direct superinterfaces, returns the interface in which the field is defined
474 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
475 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
476 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
477 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
478 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
480 // find a non-static or static field given its offset within the class.
481 bool contains_field_offset(int offset) {
482 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
483 }
485 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
486 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
488 // find a local method (returns NULL if not found)
489 Method* find_method(Symbol* name, Symbol* signature) const;
490 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
492 // lookup operation (returns NULL if not found)
493 Method* uncached_lookup_method(Symbol* name, Symbol* signature) const;
495 // lookup a method in all the interfaces that this class implements
496 // (returns NULL if not found)
497 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const;
499 // Find method indices by name. If a method with the specified name is
500 // found the index to the first method is returned, and 'end' is filled in
501 // with the index of first non-name-matching method. If no method is found
502 // -1 is returned.
503 int find_method_by_name(Symbol* name, int* end);
504 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end);
506 // constant pool
507 ConstantPool* constants() const { return _constants; }
508 void set_constants(ConstantPool* c) { _constants = c; }
510 // protection domain
511 oop protection_domain() { return _protection_domain; }
512 void set_protection_domain(oop pd) { klass_oop_store(&_protection_domain, pd); }
514 // host class
515 Klass* host_klass() const {
516 Klass** hk = (Klass**)adr_host_klass();
517 if (hk == NULL) {
518 return NULL;
519 } else {
520 return *hk;
521 }
522 }
523 void set_host_klass(Klass* host) {
524 assert(is_anonymous(), "not anonymous");
525 Klass** addr = (Klass**)adr_host_klass();
526 assert(addr != NULL, "no reversed space");
527 *addr = host;
528 }
529 bool is_anonymous() const {
530 return (_misc_flags & _misc_is_anonymous) != 0;
531 }
532 void set_is_anonymous(bool value) {
533 if (value) {
534 _misc_flags |= _misc_is_anonymous;
535 } else {
536 _misc_flags &= ~_misc_is_anonymous;
537 }
538 }
540 // signers
541 objArrayOop signers() const { return _signers; }
542 void set_signers(objArrayOop s) { klass_oop_store((oop*)&_signers, s); }
544 // source file name
545 Symbol* source_file_name() const { return _source_file_name; }
546 void set_source_file_name(Symbol* n);
548 // minor and major version numbers of class file
549 u2 minor_version() const { return _minor_version; }
550 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
551 u2 major_version() const { return _major_version; }
552 void set_major_version(u2 major_version) { _major_version = major_version; }
554 // source debug extension
555 char* source_debug_extension() const { return _source_debug_extension; }
556 void set_source_debug_extension(char* array, int length);
558 // symbol unloading support (refcount already added)
559 Symbol* array_name() { return _array_name; }
560 void set_array_name(Symbol* name) { assert(_array_name == NULL, "name already created"); _array_name = name; }
562 // nonstatic oop-map blocks
563 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
564 return oop_map_count * OopMapBlock::size_in_words();
565 }
566 unsigned int nonstatic_oop_map_count() const {
567 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
568 }
569 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
570 void set_nonstatic_oop_map_size(int words) {
571 _nonstatic_oop_map_size = words;
572 }
574 // RedefineClasses() support for previous versions:
575 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods,
576 int emcp_method_count);
577 // If the _previous_versions array is non-NULL, then this klass
578 // has been redefined at least once even if we aren't currently
579 // tracking a previous version.
580 bool has_been_redefined() const { return _previous_versions != NULL; }
581 bool has_previous_version() const;
582 void init_previous_versions() {
583 _previous_versions = NULL;
584 }
585 GrowableArray<PreviousVersionNode *>* previous_versions() const {
586 return _previous_versions;
587 }
589 static void purge_previous_versions(InstanceKlass* ik);
591 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
592 void set_cached_class_file(unsigned char *class_file_bytes,
593 jint class_file_len) { _cached_class_file_len = class_file_len;
594 _cached_class_file_bytes = class_file_bytes; }
595 jint get_cached_class_file_len() { return _cached_class_file_len; }
596 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; }
598 // JVMTI: Support for caching of field indices, types, and offsets
599 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
600 _jvmti_cached_class_field_map = descriptor;
601 }
602 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
603 return _jvmti_cached_class_field_map;
604 }
606 bool has_default_methods() const { return _has_default_methods; }
607 void set_has_default_methods(bool b) { _has_default_methods = b; }
609 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
610 inline u2 next_method_idnum();
611 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
613 // generics support
614 Symbol* generic_signature() const { return _generic_signature; }
615 void set_generic_signature(Symbol* sig) { _generic_signature = sig; }
617 u2 enclosing_method_data(int offset);
618 u2 enclosing_method_class_index() {
619 return enclosing_method_data(enclosing_method_class_index_offset);
620 }
621 u2 enclosing_method_method_index() {
622 return enclosing_method_data(enclosing_method_method_index_offset);
623 }
624 void set_enclosing_method_indices(u2 class_index,
625 u2 method_index);
627 // jmethodID support
628 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
629 methodHandle method_h);
630 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
631 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
632 jmethodID* to_dealloc_id_p,
633 jmethodID** to_dealloc_jmeths_p);
634 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
635 size_t *length_p, jmethodID* id_p);
636 jmethodID jmethod_id_or_null(Method* method);
638 // cached itable index support
639 void set_cached_itable_index(size_t idnum, int index);
640 int cached_itable_index(size_t idnum);
642 // annotations support
643 Annotations* annotations() const { return _annotations; }
644 void set_annotations(Annotations* anno) { _annotations = anno; }
645 AnnotationArray* class_annotations() const {
646 if (annotations() == NULL) return NULL;
647 return annotations()->class_annotations();
648 }
649 Array<AnnotationArray*>* fields_annotations() const {
650 if (annotations() == NULL) return NULL;
651 return annotations()->fields_annotations();
652 }
654 // allocation
655 instanceOop allocate_instance(TRAPS);
657 // additional member function to return a handle
658 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
660 objArrayOop allocate_objArray(int n, int length, TRAPS);
661 // Helper function
662 static instanceOop register_finalizer(instanceOop i, TRAPS);
664 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
665 // if not, throw either an Error or an Exception.
666 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
668 // initialization
669 void call_class_initializer(TRAPS);
670 void set_initialization_state_and_notify(ClassState state, TRAPS);
672 // OopMapCache support
673 OopMapCache* oop_map_cache() { return _oop_map_cache; }
674 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
675 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
677 // JNI identifier support (for static fields - for jni performance)
678 JNIid* jni_ids() { return _jni_ids; }
679 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
680 JNIid* jni_id_for(int offset);
682 // maintenance of deoptimization dependencies
683 int mark_dependent_nmethods(DepChange& changes);
684 void add_dependent_nmethod(nmethod* nm);
685 void remove_dependent_nmethod(nmethod* nm);
687 // On-stack replacement support
688 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
689 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
690 void add_osr_nmethod(nmethod* n);
691 void remove_osr_nmethod(nmethod* n);
692 nmethod* lookup_osr_nmethod(Method* const m, int bci, int level, bool match_level) const;
694 // Breakpoint support (see methods on Method* for details)
695 BreakpointInfo* breakpoints() const { return _breakpoints; };
696 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
698 // support for stub routines
699 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
700 TRACE_DEFINE_OFFSET;
701 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
703 // subclass/subinterface checks
704 bool implements_interface(Klass* k) const;
706 // Access to the implementor of an interface.
707 Klass* implementor() const
708 {
709 Klass** k = adr_implementor();
710 if (k == NULL) {
711 return NULL;
712 } else {
713 return *k;
714 }
715 }
717 void set_implementor(Klass* k) {
718 assert(is_interface(), "not interface");
719 Klass** addr = adr_implementor();
720 *addr = k;
721 }
723 int nof_implementors() const {
724 Klass* k = implementor();
725 if (k == NULL) {
726 return 0;
727 } else if (k != this) {
728 return 1;
729 } else {
730 return 2;
731 }
732 }
734 void add_implementor(Klass* k); // k is a new class that implements this interface
735 void init_implementor(); // initialize
737 // link this class into the implementors list of every interface it implements
738 void process_interfaces(Thread *thread);
740 // virtual operations from Klass
741 bool is_leaf_class() const { return _subklass == NULL; }
742 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
743 bool compute_is_subtype_of(Klass* k);
744 bool can_be_primary_super_slow() const;
745 int oop_size(oop obj) const { return size_helper(); }
746 bool oop_is_instance_slow() const { return true; }
748 // Iterators
749 void do_local_static_fields(FieldClosure* cl);
750 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
751 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS);
753 void methods_do(void f(Method* method));
754 void array_klasses_do(void f(Klass* k));
755 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
756 void with_array_klasses_do(void f(Klass* k));
757 bool super_types_do(SuperTypeClosure* blk);
759 // Casting from Klass*
760 static InstanceKlass* cast(Klass* k) {
761 assert(k->is_klass(), "must be");
762 assert(k->oop_is_instance(), "cast to InstanceKlass");
763 return (InstanceKlass*) k;
764 }
766 InstanceKlass* java_super() const {
767 return (super() == NULL) ? NULL : cast(super());
768 }
770 // Sizing (in words)
771 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
772 static int size(int vtable_length, int itable_length,
773 int nonstatic_oop_map_size,
774 bool is_interface, bool is_anonymous) {
775 return align_object_size(header_size() +
776 align_object_offset(vtable_length) +
777 align_object_offset(itable_length) +
778 ((is_interface || is_anonymous) ?
779 align_object_offset(nonstatic_oop_map_size) :
780 nonstatic_oop_map_size) +
781 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
782 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
783 }
784 int size() const { return size(vtable_length(),
785 itable_length(),
786 nonstatic_oop_map_size(),
787 is_interface(),
788 is_anonymous());
789 }
791 static int vtable_start_offset() { return header_size(); }
792 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
794 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); }
795 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
796 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
798 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
800 address static_field_addr(int offset);
802 OopMapBlock* start_of_nonstatic_oop_maps() const {
803 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
804 }
806 Klass** adr_implementor() const {
807 if (is_interface()) {
808 return (Klass**)(start_of_nonstatic_oop_maps() +
809 nonstatic_oop_map_count());
810 } else {
811 return NULL;
812 }
813 };
815 Klass** adr_host_klass() const {
816 if (is_anonymous()) {
817 Klass** adr_impl = adr_implementor();
818 if (adr_impl != NULL) {
819 return adr_impl + 1;
820 } else {
821 return (Klass**)(start_of_nonstatic_oop_maps() +
822 nonstatic_oop_map_count());
823 }
824 } else {
825 return NULL;
826 }
827 }
829 // Allocation profiling support
830 juint alloc_size() const { return _alloc_count * size_helper(); }
831 void set_alloc_size(juint n) {}
833 // Use this to return the size of an instance in heap words:
834 int size_helper() const {
835 return layout_helper_to_size_helper(layout_helper());
836 }
838 // This bit is initialized in classFileParser.cpp.
839 // It is false under any of the following conditions:
840 // - the class is abstract (including any interface)
841 // - the class has a finalizer (if !RegisterFinalizersAtInit)
842 // - the class size is larger than FastAllocateSizeLimit
843 // - the class is java/lang/Class, which cannot be allocated directly
844 bool can_be_fastpath_allocated() const {
845 return !layout_helper_needs_slow_path(layout_helper());
846 }
848 // Java vtable/itable
849 klassVtable* vtable() const; // return new klassVtable wrapper
850 inline Method* method_at_vtable(int index);
851 klassItable* itable() const; // return new klassItable wrapper
852 Method* method_at_itable(Klass* holder, int index, TRAPS);
854 // Garbage collection
855 virtual void oops_do(OopClosure* cl);
857 void oop_follow_contents(oop obj);
858 int oop_adjust_pointers(oop obj);
860 void clean_implementors_list(BoolObjectClosure* is_alive);
861 void clean_method_data(BoolObjectClosure* is_alive);
863 // Explicit metaspace deallocation of fields
864 // For RedefineClasses, we need to deallocate instanceKlasses
865 void deallocate_contents(ClassLoaderData* loader_data);
867 // The constant pool is on stack if any of the methods are executing or
868 // referenced by handles.
869 bool on_stack() const { return _constants->on_stack(); }
871 void release_C_heap_structures();
873 // Parallel Scavenge and Parallel Old
874 PARALLEL_GC_DECLS
876 // Naming
877 const char* signature_name() const;
879 // Iterators
880 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
881 return oop_oop_iterate_v(obj, blk);
882 }
884 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
885 return oop_oop_iterate_v_m(obj, blk, mr);
886 }
888 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
889 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
890 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
891 MemRegion mr);
893 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
894 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
896 #ifndef SERIALGC
897 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
898 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
900 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
901 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
902 #endif // !SERIALGC
904 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
905 private:
906 // initialization state
907 #ifdef ASSERT
908 void set_init_state(ClassState state);
909 #else
910 void set_init_state(ClassState state) { _init_state = (u1)state; }
911 #endif
912 void set_rewritten() { _misc_flags |= _misc_rewritten; }
913 void set_init_thread(Thread *thread) { _init_thread = thread; }
915 // The RedefineClasses() API can cause new method idnums to be needed
916 // which will cause the caches to grow. Safety requires different
917 // cache management logic if the caches can grow instead of just
918 // going from NULL to non-NULL.
919 bool idnum_can_increment() const { return has_been_redefined(); }
920 jmethodID* methods_jmethod_ids_acquire() const
921 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
922 void release_set_methods_jmethod_ids(jmethodID* jmeths)
923 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
925 int* methods_cached_itable_indices_acquire() const
926 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); }
927 void release_set_methods_cached_itable_indices(int* indices)
928 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); }
930 // Lock during initialization
931 volatile oop init_lock() const;
932 void set_init_lock(oop value) { klass_oop_store(&_init_lock, value); }
933 void fence_and_clear_init_lock(); // after fully_initialized
935 // Offsets for memory management
936 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;}
937 oop* adr_signers() const { return (oop*)&this->_signers;}
938 oop* adr_init_lock() const { return (oop*)&this->_init_lock;}
940 // Static methods that are used to implement member methods where an exposed this pointer
941 // is needed due to possible GCs
942 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
943 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
944 static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
945 static void eager_initialize_impl (instanceKlassHandle this_oop);
946 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
947 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
948 static Klass* array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
949 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS);
950 /* jni_id_for_impl for jfieldID only */
951 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
953 // Returns the array class for the n'th dimension
954 Klass* array_klass_impl(bool or_null, int n, TRAPS);
956 // Returns the array class with this class as element type
957 Klass* array_klass_impl(bool or_null, TRAPS);
959 public:
960 // CDS support - remove and restore oops from metadata. Oops are not shared.
961 virtual void remove_unshareable_info();
962 virtual void restore_unshareable_info(TRAPS);
964 // jvm support
965 jint compute_modifier_flags(TRAPS) const;
967 public:
968 // JVMTI support
969 jint jvmti_class_status() const;
971 public:
972 // Printing
973 #ifndef PRODUCT
974 void print_on(outputStream* st) const;
975 #endif
976 void print_value_on(outputStream* st) const;
978 void oop_print_value_on(oop obj, outputStream* st);
980 #ifndef PRODUCT
981 void oop_print_on (oop obj, outputStream* st);
983 void print_dependent_nmethods(bool verbose = false);
984 bool is_dependent_nmethod(nmethod* nm);
985 #endif
987 const char* internal_name() const;
989 // Verification
990 void verify_on(outputStream* st);
992 void oop_verify_on(oop obj, outputStream* st);
993 };
995 inline Method* InstanceKlass::method_at_vtable(int index) {
996 #ifndef PRODUCT
997 assert(index >= 0, "valid vtable index");
998 if (DebugVtables) {
999 verify_vtable_index(index);
1000 }
1001 #endif
1002 vtableEntry* ve = (vtableEntry*)start_of_vtable();
1003 return ve[index].method();
1004 }
1006 // for adding methods
1007 // UNSET_IDNUM return means no more ids available
1008 inline u2 InstanceKlass::next_method_idnum() {
1009 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1010 return ConstMethod::UNSET_IDNUM; // no more ids available
1011 } else {
1012 return _idnum_allocated_count++;
1013 }
1014 }
1017 /* JNIid class for jfieldIDs only */
1018 class JNIid: public CHeapObj<mtClass> {
1019 friend class VMStructs;
1020 private:
1021 Klass* _holder;
1022 JNIid* _next;
1023 int _offset;
1024 #ifdef ASSERT
1025 bool _is_static_field_id;
1026 #endif
1028 public:
1029 // Accessors
1030 Klass* holder() const { return _holder; }
1031 int offset() const { return _offset; }
1032 JNIid* next() { return _next; }
1033 // Constructor
1034 JNIid(Klass* holder, int offset, JNIid* next);
1035 // Identifier lookup
1036 JNIid* find(int offset);
1038 bool find_local_field(fieldDescriptor* fd) {
1039 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1040 }
1042 static void deallocate(JNIid* id);
1043 // Debugging
1044 #ifdef ASSERT
1045 bool is_static_field_id() const { return _is_static_field_id; }
1046 void set_is_static_field_id() { _is_static_field_id = true; }
1047 #endif
1048 void verify(Klass* holder);
1049 };
1052 // If breakpoints are more numerous than just JVMTI breakpoints,
1053 // consider compressing this data structure.
1054 // It is currently a simple linked list defined in method.hpp.
1056 class BreakpointInfo;
1059 // A collection point for interesting information about the previous
1060 // version(s) of an InstanceKlass. This class uses weak references to
1061 // the information so that the information may be collected as needed
1062 // by the system. If the information is shared, then a regular
1063 // reference must be used because a weak reference would be seen as
1064 // collectible. A GrowableArray of PreviousVersionNodes is attached
1065 // to the InstanceKlass as needed. See PreviousVersionWalker below.
1066 class PreviousVersionNode : public CHeapObj<mtClass> {
1067 private:
1068 // A shared ConstantPool is never collected so we'll always have
1069 // a reference to it so we can update items in the cache. We'll
1070 // have a weak reference to a non-shared ConstantPool until all
1071 // of the methods (EMCP or obsolete) have been collected; the
1072 // non-shared ConstantPool becomes collectible at that point.
1073 ConstantPool* _prev_constant_pool; // regular or weak reference
1074 bool _prev_cp_is_weak; // true if not a shared ConstantPool
1076 // If the previous version of the InstanceKlass doesn't have any
1077 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the
1078 // EMCP methods have been collected, then _prev_EMCP_methods can
1079 // have a length of zero.
1080 GrowableArray<Method*>* _prev_EMCP_methods;
1082 public:
1083 PreviousVersionNode(ConstantPool* prev_constant_pool, bool prev_cp_is_weak,
1084 GrowableArray<Method*>* prev_EMCP_methods);
1085 ~PreviousVersionNode();
1086 ConstantPool* prev_constant_pool() const {
1087 return _prev_constant_pool;
1088 }
1089 GrowableArray<Method*>* prev_EMCP_methods() const {
1090 return _prev_EMCP_methods;
1091 }
1092 };
1095 // A Handle-ized version of PreviousVersionNode.
1096 class PreviousVersionInfo : public ResourceObj {
1097 private:
1098 constantPoolHandle _prev_constant_pool_handle;
1099 // If the previous version of the InstanceKlass doesn't have any
1100 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the
1101 // methods cannot be collected while we hold a handle,
1102 // _prev_EMCP_methods should never have a length of zero.
1103 GrowableArray<methodHandle>* _prev_EMCP_method_handles;
1105 public:
1106 PreviousVersionInfo(PreviousVersionNode *pv_node);
1107 ~PreviousVersionInfo();
1108 constantPoolHandle prev_constant_pool_handle() const {
1109 return _prev_constant_pool_handle;
1110 }
1111 GrowableArray<methodHandle>* prev_EMCP_method_handles() const {
1112 return _prev_EMCP_method_handles;
1113 }
1114 };
1117 // Helper object for walking previous versions. This helper cleans up
1118 // the Handles that it allocates when the helper object is destroyed.
1119 // The PreviousVersionInfo object returned by next_previous_version()
1120 // is only valid until a subsequent call to next_previous_version() or
1121 // the helper object is destroyed.
1122 class PreviousVersionWalker : public StackObj {
1123 private:
1124 GrowableArray<PreviousVersionNode *>* _previous_versions;
1125 int _current_index;
1126 // Fields for cleaning up when we are done walking the previous versions:
1127 // A HandleMark for the PreviousVersionInfo handles:
1128 HandleMark _hm;
1130 // It would be nice to have a ResourceMark field in this helper also,
1131 // but the ResourceMark code says to be careful to delete handles held
1132 // in GrowableArrays _before_ deleting the GrowableArray. Since we
1133 // can't guarantee the order in which the fields are destroyed, we
1134 // have to let the creator of the PreviousVersionWalker object do
1135 // the right thing. Also, adding a ResourceMark here causes an
1136 // include loop.
1138 // A pointer to the current info object so we can handle the deletes.
1139 PreviousVersionInfo * _current_p;
1141 public:
1142 PreviousVersionWalker(InstanceKlass *ik);
1143 ~PreviousVersionWalker();
1145 // Return the interesting information for the next previous version
1146 // of the klass. Returns NULL if there are no more previous versions.
1147 PreviousVersionInfo* next_previous_version();
1148 };
1151 //
1152 // nmethodBucket is used to record dependent nmethods for
1153 // deoptimization. nmethod dependencies are actually <klass, method>
1154 // pairs but we really only care about the klass part for purposes of
1155 // finding nmethods which might need to be deoptimized. Instead of
1156 // recording the method, a count of how many times a particular nmethod
1157 // was recorded is kept. This ensures that any recording errors are
1158 // noticed since an nmethod should be removed as many times are it's
1159 // added.
1160 //
1161 class nmethodBucket: public CHeapObj<mtClass> {
1162 friend class VMStructs;
1163 private:
1164 nmethod* _nmethod;
1165 int _count;
1166 nmethodBucket* _next;
1168 public:
1169 nmethodBucket(nmethod* nmethod, nmethodBucket* next) {
1170 _nmethod = nmethod;
1171 _next = next;
1172 _count = 1;
1173 }
1174 int count() { return _count; }
1175 int increment() { _count += 1; return _count; }
1176 int decrement() { _count -= 1; assert(_count >= 0, "don't underflow"); return _count; }
1177 nmethodBucket* next() { return _next; }
1178 void set_next(nmethodBucket* b) { _next = b; }
1179 nmethod* get_nmethod() { return _nmethod; }
1180 };
1182 // An iterator that's used to access the inner classes indices in the
1183 // InstanceKlass::_inner_classes array.
1184 class InnerClassesIterator : public StackObj {
1185 private:
1186 Array<jushort>* _inner_classes;
1187 int _length;
1188 int _idx;
1189 public:
1191 InnerClassesIterator(instanceKlassHandle k) {
1192 _inner_classes = k->inner_classes();
1193 if (k->inner_classes() != NULL) {
1194 _length = _inner_classes->length();
1195 // The inner class array's length should be the multiple of
1196 // inner_class_next_offset if it only contains the InnerClasses
1197 // attribute data, or it should be
1198 // n*inner_class_next_offset+enclosing_method_attribute_size
1199 // if it also contains the EnclosingMethod data.
1200 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1201 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1202 "just checking");
1203 // Remove the enclosing_method portion if exists.
1204 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1205 _length -= InstanceKlass::enclosing_method_attribute_size;
1206 }
1207 } else {
1208 _length = 0;
1209 }
1210 _idx = 0;
1211 }
1213 int length() const {
1214 return _length;
1215 }
1217 void next() {
1218 _idx += InstanceKlass::inner_class_next_offset;
1219 }
1221 bool done() const {
1222 return (_idx >= _length);
1223 }
1225 u2 inner_class_info_index() const {
1226 return _inner_classes->at(
1227 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1228 }
1230 void set_inner_class_info_index(u2 index) {
1231 _inner_classes->at_put(
1232 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1233 }
1235 u2 outer_class_info_index() const {
1236 return _inner_classes->at(
1237 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1238 }
1240 void set_outer_class_info_index(u2 index) {
1241 _inner_classes->at_put(
1242 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1243 }
1245 u2 inner_name_index() const {
1246 return _inner_classes->at(
1247 _idx + InstanceKlass::inner_class_inner_name_offset);
1248 }
1250 void set_inner_name_index(u2 index) {
1251 _inner_classes->at_put(
1252 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1253 }
1255 u2 inner_access_flags() const {
1256 return _inner_classes->at(
1257 _idx + InstanceKlass::inner_class_access_flags_offset);
1258 }
1259 };
1261 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP