Wed, 02 Jan 2013 20:28:09 -0500
8005494: SIGSEGV in Rewriter::relocate_and_link() when testing Weblogic with CompressedOops and KlassPtrs
Summary: Relocate functions with jsr's when rewriting so not repeated after reading shared archive
Reviewed-by: twisti, jrose
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
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21 * questions.
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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;
136 friend class CompileReplay;
138 protected:
139 // Constructor
140 InstanceKlass(int vtable_len,
141 int itable_len,
142 int static_field_size,
143 int nonstatic_oop_map_size,
144 ReferenceType rt,
145 AccessFlags access_flags,
146 bool is_anonymous);
147 public:
148 static Klass* allocate_instance_klass(ClassLoaderData* loader_data,
149 int vtable_len,
150 int itable_len,
151 int static_field_size,
152 int nonstatic_oop_map_size,
153 ReferenceType rt,
154 AccessFlags access_flags,
155 Symbol* name,
156 Klass* super_klass,
157 KlassHandle host_klass,
158 TRAPS);
160 InstanceKlass() { assert(DumpSharedSpaces || UseSharedSpaces, "only for CDS"); }
162 // See "The Java Virtual Machine Specification" section 2.16.2-5 for a detailed description
163 // of the class loading & initialization procedure, and the use of the states.
164 enum ClassState {
165 allocated, // allocated (but not yet linked)
166 loaded, // loaded and inserted in class hierarchy (but not linked yet)
167 linked, // successfully linked/verified (but not initialized yet)
168 being_initialized, // currently running class initializer
169 fully_initialized, // initialized (successfull final state)
170 initialization_error // error happened during initialization
171 };
173 protected:
174 // Protection domain.
175 oop _protection_domain;
176 // Class signers.
177 objArrayOop _signers;
178 // Initialization lock. Must be one per class and it has to be a VM internal
179 // object so java code cannot lock it (like the mirror)
180 // It has to be an object not a Mutex because it's held through java calls.
181 volatile oop _init_lock;
183 // Annotations for this class
184 Annotations* _annotations;
185 // Array classes holding elements of this class.
186 Klass* _array_klasses;
187 // Constant pool for this class.
188 ConstantPool* _constants;
189 // The InnerClasses attribute and EnclosingMethod attribute. The
190 // _inner_classes is an array of shorts. If the class has InnerClasses
191 // attribute, then the _inner_classes array begins with 4-tuples of shorts
192 // [inner_class_info_index, outer_class_info_index,
193 // inner_name_index, inner_class_access_flags] for the InnerClasses
194 // attribute. If the EnclosingMethod attribute exists, it occupies the
195 // last two shorts [class_index, method_index] of the array. If only
196 // the InnerClasses attribute exists, the _inner_classes array length is
197 // number_of_inner_classes * 4. If the class has both InnerClasses
198 // and EnclosingMethod attributes the _inner_classes array length is
199 // number_of_inner_classes * 4 + enclosing_method_attribute_size.
200 Array<jushort>* _inner_classes;
202 // Name of source file containing this klass, NULL if not specified.
203 Symbol* _source_file_name;
204 // the source debug extension for this klass, NULL if not specified.
205 // Specified as UTF-8 string without terminating zero byte in the classfile,
206 // it is stored in the instanceklass as a NULL-terminated UTF-8 string
207 char* _source_debug_extension;
208 // Generic signature, or null if none.
209 Symbol* _generic_signature;
210 // Array name derived from this class which needs unreferencing
211 // if this class is unloaded.
212 Symbol* _array_name;
214 // Number of heapOopSize words used by non-static fields in this klass
215 // (including inherited fields but after header_size()).
216 int _nonstatic_field_size;
217 int _static_field_size; // number words used by static fields (oop and non-oop) in this klass
218 u2 _static_oop_field_count;// number of static oop fields in this klass
219 u2 _java_fields_count; // The number of declared Java fields
220 int _nonstatic_oop_map_size;// size in words of nonstatic oop map blocks
222 bool _is_marked_dependent; // used for marking during flushing and deoptimization
223 enum {
224 _misc_rewritten = 1 << 0, // methods rewritten.
225 _misc_has_nonstatic_fields = 1 << 1, // for sizing with UseCompressedOops
226 _misc_should_verify_class = 1 << 2, // allow caching of preverification
227 _misc_is_anonymous = 1 << 3 // has embedded _inner_classes field
228 };
229 u2 _misc_flags;
230 u2 _minor_version; // minor version number of class file
231 u2 _major_version; // major version number of class file
232 Thread* _init_thread; // Pointer to current thread doing initialization (to handle recusive initialization)
233 int _vtable_len; // length of Java vtable (in words)
234 int _itable_len; // length of Java itable (in words)
235 OopMapCache* volatile _oop_map_cache; // OopMapCache for all methods in the klass (allocated lazily)
236 JNIid* _jni_ids; // First JNI identifier for static fields in this class
237 jmethodID* _methods_jmethod_ids; // jmethodIDs corresponding to method_idnum, or NULL if none
238 int* _methods_cached_itable_indices; // itable_index cache for JNI invoke corresponding to methods idnum, or NULL
239 nmethodBucket* _dependencies; // list of dependent nmethods
240 nmethod* _osr_nmethods_head; // Head of list of on-stack replacement nmethods for this class
241 BreakpointInfo* _breakpoints; // bpt lists, managed by Method*
242 // Array of interesting part(s) of the previous version(s) of this
243 // InstanceKlass. See PreviousVersionWalker below.
244 GrowableArray<PreviousVersionNode *>* _previous_versions;
245 // JVMTI fields can be moved to their own structure - see 6315920
246 unsigned char * _cached_class_file_bytes; // JVMTI: cached class file, before retransformable agent modified it in CFLH
247 jint _cached_class_file_len; // JVMTI: length of above
248 JvmtiCachedClassFieldMap* _jvmti_cached_class_field_map; // JVMTI: used during heap iteration
250 // true if class, superclass, or implemented interfaces have default methods
251 bool _has_default_methods;
253 volatile u2 _idnum_allocated_count; // JNI/JVMTI: increments with the addition of methods, old ids don't change
254 // Method array.
255 Array<Method*>* _methods;
256 // Interface (Klass*s) this class declares locally to implement.
257 Array<Klass*>* _local_interfaces;
258 // Interface (Klass*s) this class implements transitively.
259 Array<Klass*>* _transitive_interfaces;
260 // Int array containing the original order of method in the class file (for JVMTI).
261 Array<int>* _method_ordering;
262 // Instance and static variable information, starts with 6-tuples of shorts
263 // [access, name index, sig index, initval index, low_offset, high_offset]
264 // for all fields, followed by the generic signature data at the end of
265 // the array. Only fields with generic signature attributes have the generic
266 // signature data set in the array. The fields array looks like following:
267 //
268 // f1: [access, name index, sig index, initial value index, low_offset, high_offset]
269 // f2: [access, name index, sig index, initial value index, low_offset, high_offset]
270 // ...
271 // fn: [access, name index, sig index, initial value index, low_offset, high_offset]
272 // [generic signature index]
273 // [generic signature index]
274 // ...
275 Array<u2>* _fields;
277 // Class states are defined as ClassState (see above).
278 // Place the _init_state here to utilize the unused 2-byte after
279 // _idnum_allocated_count.
280 u1 _init_state; // state of class
282 u1 _reference_type; // reference type
284 // embedded Java vtable follows here
285 // embedded Java itables follows here
286 // embedded static fields follows here
287 // embedded nonstatic oop-map blocks follows here
288 // embedded implementor of this interface follows here
289 // The embedded implementor only exists if the current klass is an
290 // iterface. The possible values of the implementor fall into following
291 // three cases:
292 // NULL: no implementor.
293 // A Klass* that's not itself: one implementor.
294 // Itsef: more than one implementors.
295 // embedded host klass follows here
296 // The embedded host klass only exists in an anonymous class for
297 // dynamic language support (JSR 292 enabled). The host class grants
298 // its access privileges to this class also. The host class is either
299 // named, or a previously loaded anonymous class. A non-anonymous class
300 // or an anonymous class loaded through normal classloading does not
301 // have this embedded field.
302 //
304 friend class SystemDictionary;
306 public:
307 bool has_nonstatic_fields() const {
308 return (_misc_flags & _misc_has_nonstatic_fields) != 0;
309 }
310 void set_has_nonstatic_fields(bool b) {
311 if (b) {
312 _misc_flags |= _misc_has_nonstatic_fields;
313 } else {
314 _misc_flags &= ~_misc_has_nonstatic_fields;
315 }
316 }
318 // field sizes
319 int nonstatic_field_size() const { return _nonstatic_field_size; }
320 void set_nonstatic_field_size(int size) { _nonstatic_field_size = size; }
322 int static_field_size() const { return _static_field_size; }
323 void set_static_field_size(int size) { _static_field_size = size; }
325 int static_oop_field_count() const { return (int)_static_oop_field_count; }
326 void set_static_oop_field_count(u2 size) { _static_oop_field_count = size; }
328 // Java vtable
329 int vtable_length() const { return _vtable_len; }
330 void set_vtable_length(int len) { _vtable_len = len; }
332 // Java itable
333 int itable_length() const { return _itable_len; }
334 void set_itable_length(int len) { _itable_len = len; }
336 // array klasses
337 Klass* array_klasses() const { return _array_klasses; }
338 void set_array_klasses(Klass* k) { _array_klasses = k; }
340 // methods
341 Array<Method*>* methods() const { return _methods; }
342 void set_methods(Array<Method*>* a) { _methods = a; }
343 Method* method_with_idnum(int idnum);
345 // method ordering
346 Array<int>* method_ordering() const { return _method_ordering; }
347 void set_method_ordering(Array<int>* m) { _method_ordering = m; }
349 // interfaces
350 Array<Klass*>* local_interfaces() const { return _local_interfaces; }
351 void set_local_interfaces(Array<Klass*>* a) {
352 guarantee(_local_interfaces == NULL || a == NULL, "Just checking");
353 _local_interfaces = a; }
354 Array<Klass*>* transitive_interfaces() const { return _transitive_interfaces; }
355 void set_transitive_interfaces(Array<Klass*>* a) {
356 guarantee(_transitive_interfaces == NULL || a == NULL, "Just checking");
357 _transitive_interfaces = a; }
359 private:
360 friend class fieldDescriptor;
361 FieldInfo* field(int index) const { return FieldInfo::from_field_array(_fields, index); }
363 public:
364 int field_offset (int index) const { return field(index)->offset(); }
365 int field_access_flags(int index) const { return field(index)->access_flags(); }
366 Symbol* field_name (int index) const { return field(index)->name(constants()); }
367 Symbol* field_signature (int index) const { return field(index)->signature(constants()); }
369 // Number of Java declared fields
370 int java_fields_count() const { return (int)_java_fields_count; }
372 Array<u2>* fields() const { return _fields; }
374 void set_fields(Array<u2>* f, u2 java_fields_count) {
375 guarantee(_fields == NULL || f == NULL, "Just checking");
376 _fields = f;
377 _java_fields_count = java_fields_count;
378 }
380 // inner classes
381 Array<u2>* inner_classes() const { return _inner_classes; }
382 void set_inner_classes(Array<u2>* f) { _inner_classes = f; }
384 enum InnerClassAttributeOffset {
385 // From http://mirror.eng/products/jdk/1.1/docs/guide/innerclasses/spec/innerclasses.doc10.html#18814
386 inner_class_inner_class_info_offset = 0,
387 inner_class_outer_class_info_offset = 1,
388 inner_class_inner_name_offset = 2,
389 inner_class_access_flags_offset = 3,
390 inner_class_next_offset = 4
391 };
393 enum EnclosingMethodAttributeOffset {
394 enclosing_method_class_index_offset = 0,
395 enclosing_method_method_index_offset = 1,
396 enclosing_method_attribute_size = 2
397 };
399 // method override check
400 bool is_override(methodHandle super_method, Handle targetclassloader, Symbol* targetclassname, TRAPS);
402 // package
403 bool is_same_class_package(Klass* class2);
404 bool is_same_class_package(oop classloader2, Symbol* classname2);
405 static bool is_same_class_package(oop class_loader1, Symbol* class_name1, oop class_loader2, Symbol* class_name2);
407 // find an enclosing class (defined where original code was, in jvm.cpp!)
408 Klass* compute_enclosing_class(bool* inner_is_member, TRAPS) {
409 instanceKlassHandle self(THREAD, this);
410 return compute_enclosing_class_impl(self, inner_is_member, THREAD);
411 }
412 static Klass* compute_enclosing_class_impl(instanceKlassHandle self,
413 bool* inner_is_member, TRAPS);
415 // tell if two classes have the same enclosing class (at package level)
416 bool is_same_package_member(Klass* class2, TRAPS) {
417 instanceKlassHandle self(THREAD, this);
418 return is_same_package_member_impl(self, class2, THREAD);
419 }
420 static bool is_same_package_member_impl(instanceKlassHandle self,
421 Klass* class2, TRAPS);
423 // initialization state
424 bool is_loaded() const { return _init_state >= loaded; }
425 bool is_linked() const { return _init_state >= linked; }
426 bool is_initialized() const { return _init_state == fully_initialized; }
427 bool is_not_initialized() const { return _init_state < being_initialized; }
428 bool is_being_initialized() const { return _init_state == being_initialized; }
429 bool is_in_error_state() const { return _init_state == initialization_error; }
430 bool is_reentrant_initialization(Thread *thread) { return thread == _init_thread; }
431 ClassState init_state() { return (ClassState)_init_state; }
432 bool is_rewritten() const { return (_misc_flags & _misc_rewritten) != 0; }
434 // defineClass specified verification
435 bool should_verify_class() const {
436 return (_misc_flags & _misc_should_verify_class) != 0;
437 }
438 void set_should_verify_class(bool value) {
439 if (value) {
440 _misc_flags |= _misc_should_verify_class;
441 } else {
442 _misc_flags &= ~_misc_should_verify_class;
443 }
444 }
446 // marking
447 bool is_marked_dependent() const { return _is_marked_dependent; }
448 void set_is_marked_dependent(bool value) { _is_marked_dependent = value; }
450 // initialization (virtuals from Klass)
451 bool should_be_initialized() const; // means that initialize should be called
452 void initialize(TRAPS);
453 void link_class(TRAPS);
454 bool link_class_or_fail(TRAPS); // returns false on failure
455 void unlink_class();
456 void rewrite_class(TRAPS);
457 void link_methods(TRAPS);
458 Method* class_initializer();
460 // set the class to initialized if no static initializer is present
461 void eager_initialize(Thread *thread);
463 // reference type
464 ReferenceType reference_type() const { return (ReferenceType)_reference_type; }
465 void set_reference_type(ReferenceType t) {
466 assert(t == (u1)t, "overflow");
467 _reference_type = (u1)t;
468 }
470 static ByteSize reference_type_offset() { return in_ByteSize(offset_of(InstanceKlass, _reference_type)); }
472 // find local field, returns true if found
473 bool find_local_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
474 // find field in direct superinterfaces, returns the interface in which the field is defined
475 Klass* find_interface_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
476 // find field according to JVM spec 5.4.3.2, returns the klass in which the field is defined
477 Klass* find_field(Symbol* name, Symbol* sig, fieldDescriptor* fd) const;
478 // find instance or static fields according to JVM spec 5.4.3.2, returns the klass in which the field is defined
479 Klass* find_field(Symbol* name, Symbol* sig, bool is_static, fieldDescriptor* fd) const;
481 // find a non-static or static field given its offset within the class.
482 bool contains_field_offset(int offset) {
483 return instanceOopDesc::contains_field_offset(offset, nonstatic_field_size());
484 }
486 bool find_local_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
487 bool find_field_from_offset(int offset, bool is_static, fieldDescriptor* fd) const;
489 // find a local method (returns NULL if not found)
490 Method* find_method(Symbol* name, Symbol* signature) const;
491 static Method* find_method(Array<Method*>* methods, Symbol* name, Symbol* signature);
493 // lookup operation (returns NULL if not found)
494 Method* uncached_lookup_method(Symbol* name, Symbol* signature) const;
496 // lookup a method in all the interfaces that this class implements
497 // (returns NULL if not found)
498 Method* lookup_method_in_all_interfaces(Symbol* name, Symbol* signature) const;
500 // Find method indices by name. If a method with the specified name is
501 // found the index to the first method is returned, and 'end' is filled in
502 // with the index of first non-name-matching method. If no method is found
503 // -1 is returned.
504 int find_method_by_name(Symbol* name, int* end);
505 static int find_method_by_name(Array<Method*>* methods, Symbol* name, int* end);
507 // constant pool
508 ConstantPool* constants() const { return _constants; }
509 void set_constants(ConstantPool* c) { _constants = c; }
511 // protection domain
512 oop protection_domain() { return _protection_domain; }
513 void set_protection_domain(oop pd) { klass_oop_store(&_protection_domain, pd); }
515 // host class
516 Klass* host_klass() const {
517 Klass** hk = (Klass**)adr_host_klass();
518 if (hk == NULL) {
519 return NULL;
520 } else {
521 return *hk;
522 }
523 }
524 void set_host_klass(Klass* host) {
525 assert(is_anonymous(), "not anonymous");
526 Klass** addr = (Klass**)adr_host_klass();
527 assert(addr != NULL, "no reversed space");
528 *addr = host;
529 }
530 bool is_anonymous() const {
531 return (_misc_flags & _misc_is_anonymous) != 0;
532 }
533 void set_is_anonymous(bool value) {
534 if (value) {
535 _misc_flags |= _misc_is_anonymous;
536 } else {
537 _misc_flags &= ~_misc_is_anonymous;
538 }
539 }
541 // Oop that keeps the metadata for this class from being unloaded
542 // in places where the metadata is stored in other places, like nmethods
543 oop klass_holder() const {
544 return is_anonymous() ? java_mirror() : class_loader();
545 }
547 // signers
548 objArrayOop signers() const { return _signers; }
549 void set_signers(objArrayOop s) { klass_oop_store((oop*)&_signers, s); }
551 // source file name
552 Symbol* source_file_name() const { return _source_file_name; }
553 void set_source_file_name(Symbol* n);
555 // minor and major version numbers of class file
556 u2 minor_version() const { return _minor_version; }
557 void set_minor_version(u2 minor_version) { _minor_version = minor_version; }
558 u2 major_version() const { return _major_version; }
559 void set_major_version(u2 major_version) { _major_version = major_version; }
561 // source debug extension
562 char* source_debug_extension() const { return _source_debug_extension; }
563 void set_source_debug_extension(char* array, int length);
565 // symbol unloading support (refcount already added)
566 Symbol* array_name() { return _array_name; }
567 void set_array_name(Symbol* name) { assert(_array_name == NULL, "name already created"); _array_name = name; }
569 // nonstatic oop-map blocks
570 static int nonstatic_oop_map_size(unsigned int oop_map_count) {
571 return oop_map_count * OopMapBlock::size_in_words();
572 }
573 unsigned int nonstatic_oop_map_count() const {
574 return _nonstatic_oop_map_size / OopMapBlock::size_in_words();
575 }
576 int nonstatic_oop_map_size() const { return _nonstatic_oop_map_size; }
577 void set_nonstatic_oop_map_size(int words) {
578 _nonstatic_oop_map_size = words;
579 }
581 // RedefineClasses() support for previous versions:
582 void add_previous_version(instanceKlassHandle ikh, BitMap *emcp_methods,
583 int emcp_method_count);
584 // If the _previous_versions array is non-NULL, then this klass
585 // has been redefined at least once even if we aren't currently
586 // tracking a previous version.
587 bool has_been_redefined() const { return _previous_versions != NULL; }
588 bool has_previous_version() const;
589 void init_previous_versions() {
590 _previous_versions = NULL;
591 }
592 GrowableArray<PreviousVersionNode *>* previous_versions() const {
593 return _previous_versions;
594 }
596 static void purge_previous_versions(InstanceKlass* ik);
598 // JVMTI: Support for caching a class file before it is modified by an agent that can do retransformation
599 void set_cached_class_file(unsigned char *class_file_bytes,
600 jint class_file_len) { _cached_class_file_len = class_file_len;
601 _cached_class_file_bytes = class_file_bytes; }
602 jint get_cached_class_file_len() { return _cached_class_file_len; }
603 unsigned char * get_cached_class_file_bytes() { return _cached_class_file_bytes; }
605 // JVMTI: Support for caching of field indices, types, and offsets
606 void set_jvmti_cached_class_field_map(JvmtiCachedClassFieldMap* descriptor) {
607 _jvmti_cached_class_field_map = descriptor;
608 }
609 JvmtiCachedClassFieldMap* jvmti_cached_class_field_map() const {
610 return _jvmti_cached_class_field_map;
611 }
613 bool has_default_methods() const { return _has_default_methods; }
614 void set_has_default_methods(bool b) { _has_default_methods = b; }
616 // for adding methods, ConstMethod::UNSET_IDNUM means no more ids available
617 inline u2 next_method_idnum();
618 void set_initial_method_idnum(u2 value) { _idnum_allocated_count = value; }
620 // generics support
621 Symbol* generic_signature() const { return _generic_signature; }
622 void set_generic_signature(Symbol* sig) { _generic_signature = sig; }
624 u2 enclosing_method_data(int offset);
625 u2 enclosing_method_class_index() {
626 return enclosing_method_data(enclosing_method_class_index_offset);
627 }
628 u2 enclosing_method_method_index() {
629 return enclosing_method_data(enclosing_method_method_index_offset);
630 }
631 void set_enclosing_method_indices(u2 class_index,
632 u2 method_index);
634 // jmethodID support
635 static jmethodID get_jmethod_id(instanceKlassHandle ik_h,
636 methodHandle method_h);
637 static jmethodID get_jmethod_id_fetch_or_update(instanceKlassHandle ik_h,
638 size_t idnum, jmethodID new_id, jmethodID* new_jmeths,
639 jmethodID* to_dealloc_id_p,
640 jmethodID** to_dealloc_jmeths_p);
641 static void get_jmethod_id_length_value(jmethodID* cache, size_t idnum,
642 size_t *length_p, jmethodID* id_p);
643 jmethodID jmethod_id_or_null(Method* method);
645 // cached itable index support
646 void set_cached_itable_index(size_t idnum, int index);
647 int cached_itable_index(size_t idnum);
649 // annotations support
650 Annotations* annotations() const { return _annotations; }
651 void set_annotations(Annotations* anno) { _annotations = anno; }
652 AnnotationArray* class_annotations() const {
653 if (annotations() == NULL) return NULL;
654 return annotations()->class_annotations();
655 }
656 Array<AnnotationArray*>* fields_annotations() const {
657 if (annotations() == NULL) return NULL;
658 return annotations()->fields_annotations();
659 }
660 Annotations* type_annotations() const {
661 if (annotations() == NULL) return NULL;
662 return annotations()->type_annotations();
663 }
665 // allocation
666 instanceOop allocate_instance(TRAPS);
668 // additional member function to return a handle
669 instanceHandle allocate_instance_handle(TRAPS) { return instanceHandle(THREAD, allocate_instance(THREAD)); }
671 objArrayOop allocate_objArray(int n, int length, TRAPS);
672 // Helper function
673 static instanceOop register_finalizer(instanceOop i, TRAPS);
675 // Check whether reflection/jni/jvm code is allowed to instantiate this class;
676 // if not, throw either an Error or an Exception.
677 virtual void check_valid_for_instantiation(bool throwError, TRAPS);
679 // initialization
680 void call_class_initializer(TRAPS);
681 void set_initialization_state_and_notify(ClassState state, TRAPS);
683 // OopMapCache support
684 OopMapCache* oop_map_cache() { return _oop_map_cache; }
685 void set_oop_map_cache(OopMapCache *cache) { _oop_map_cache = cache; }
686 void mask_for(methodHandle method, int bci, InterpreterOopMap* entry);
688 // JNI identifier support (for static fields - for jni performance)
689 JNIid* jni_ids() { return _jni_ids; }
690 void set_jni_ids(JNIid* ids) { _jni_ids = ids; }
691 JNIid* jni_id_for(int offset);
693 // maintenance of deoptimization dependencies
694 int mark_dependent_nmethods(DepChange& changes);
695 void add_dependent_nmethod(nmethod* nm);
696 void remove_dependent_nmethod(nmethod* nm);
698 // On-stack replacement support
699 nmethod* osr_nmethods_head() const { return _osr_nmethods_head; };
700 void set_osr_nmethods_head(nmethod* h) { _osr_nmethods_head = h; };
701 void add_osr_nmethod(nmethod* n);
702 void remove_osr_nmethod(nmethod* n);
703 nmethod* lookup_osr_nmethod(Method* const m, int bci, int level, bool match_level) const;
705 // Breakpoint support (see methods on Method* for details)
706 BreakpointInfo* breakpoints() const { return _breakpoints; };
707 void set_breakpoints(BreakpointInfo* bps) { _breakpoints = bps; };
709 // support for stub routines
710 static ByteSize init_state_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_state)); }
711 TRACE_DEFINE_OFFSET;
712 static ByteSize init_thread_offset() { return in_ByteSize(offset_of(InstanceKlass, _init_thread)); }
714 // subclass/subinterface checks
715 bool implements_interface(Klass* k) const;
717 // Access to the implementor of an interface.
718 Klass* implementor() const
719 {
720 Klass** k = adr_implementor();
721 if (k == NULL) {
722 return NULL;
723 } else {
724 return *k;
725 }
726 }
728 void set_implementor(Klass* k) {
729 assert(is_interface(), "not interface");
730 Klass** addr = adr_implementor();
731 *addr = k;
732 }
734 int nof_implementors() const {
735 Klass* k = implementor();
736 if (k == NULL) {
737 return 0;
738 } else if (k != this) {
739 return 1;
740 } else {
741 return 2;
742 }
743 }
745 void add_implementor(Klass* k); // k is a new class that implements this interface
746 void init_implementor(); // initialize
748 // link this class into the implementors list of every interface it implements
749 void process_interfaces(Thread *thread);
751 // virtual operations from Klass
752 bool is_leaf_class() const { return _subklass == NULL; }
753 GrowableArray<Klass*>* compute_secondary_supers(int num_extra_slots);
754 bool compute_is_subtype_of(Klass* k);
755 bool can_be_primary_super_slow() const;
756 int oop_size(oop obj) const { return size_helper(); }
757 bool oop_is_instance_slow() const { return true; }
759 // Iterators
760 void do_local_static_fields(FieldClosure* cl);
761 void do_nonstatic_fields(FieldClosure* cl); // including inherited fields
762 void do_local_static_fields(void f(fieldDescriptor*, TRAPS), TRAPS);
764 void methods_do(void f(Method* method));
765 void array_klasses_do(void f(Klass* k));
766 void array_klasses_do(void f(Klass* k, TRAPS), TRAPS);
767 void with_array_klasses_do(void f(Klass* k));
768 bool super_types_do(SuperTypeClosure* blk);
770 // Casting from Klass*
771 static InstanceKlass* cast(Klass* k) {
772 assert(k->is_klass(), "must be");
773 assert(k->oop_is_instance(), "cast to InstanceKlass");
774 return (InstanceKlass*) k;
775 }
777 InstanceKlass* java_super() const {
778 return (super() == NULL) ? NULL : cast(super());
779 }
781 // Sizing (in words)
782 static int header_size() { return align_object_offset(sizeof(InstanceKlass)/HeapWordSize); }
783 static int size(int vtable_length, int itable_length,
784 int nonstatic_oop_map_size,
785 bool is_interface, bool is_anonymous) {
786 return align_object_size(header_size() +
787 align_object_offset(vtable_length) +
788 align_object_offset(itable_length) +
789 ((is_interface || is_anonymous) ?
790 align_object_offset(nonstatic_oop_map_size) :
791 nonstatic_oop_map_size) +
792 (is_interface ? (int)sizeof(Klass*)/HeapWordSize : 0) +
793 (is_anonymous ? (int)sizeof(Klass*)/HeapWordSize : 0));
794 }
795 int size() const { return size(vtable_length(),
796 itable_length(),
797 nonstatic_oop_map_size(),
798 is_interface(),
799 is_anonymous());
800 }
802 static int vtable_start_offset() { return header_size(); }
803 static int vtable_length_offset() { return offset_of(InstanceKlass, _vtable_len) / HeapWordSize; }
805 intptr_t* start_of_vtable() const { return ((intptr_t*)this) + vtable_start_offset(); }
806 intptr_t* start_of_itable() const { return start_of_vtable() + align_object_offset(vtable_length()); }
807 int itable_offset_in_words() const { return start_of_itable() - (intptr_t*)this; }
809 intptr_t* end_of_itable() const { return start_of_itable() + itable_length(); }
811 address static_field_addr(int offset);
813 OopMapBlock* start_of_nonstatic_oop_maps() const {
814 return (OopMapBlock*)(start_of_itable() + align_object_offset(itable_length()));
815 }
817 Klass** adr_implementor() const {
818 if (is_interface()) {
819 return (Klass**)(start_of_nonstatic_oop_maps() +
820 nonstatic_oop_map_count());
821 } else {
822 return NULL;
823 }
824 };
826 Klass** adr_host_klass() const {
827 if (is_anonymous()) {
828 Klass** adr_impl = adr_implementor();
829 if (adr_impl != NULL) {
830 return adr_impl + 1;
831 } else {
832 return (Klass**)(start_of_nonstatic_oop_maps() +
833 nonstatic_oop_map_count());
834 }
835 } else {
836 return NULL;
837 }
838 }
840 // Allocation profiling support
841 juint alloc_size() const { return _alloc_count * size_helper(); }
842 void set_alloc_size(juint n) {}
844 // Use this to return the size of an instance in heap words:
845 int size_helper() const {
846 return layout_helper_to_size_helper(layout_helper());
847 }
849 // This bit is initialized in classFileParser.cpp.
850 // It is false under any of the following conditions:
851 // - the class is abstract (including any interface)
852 // - the class has a finalizer (if !RegisterFinalizersAtInit)
853 // - the class size is larger than FastAllocateSizeLimit
854 // - the class is java/lang/Class, which cannot be allocated directly
855 bool can_be_fastpath_allocated() const {
856 return !layout_helper_needs_slow_path(layout_helper());
857 }
859 // Java vtable/itable
860 klassVtable* vtable() const; // return new klassVtable wrapper
861 inline Method* method_at_vtable(int index);
862 klassItable* itable() const; // return new klassItable wrapper
863 Method* method_at_itable(Klass* holder, int index, TRAPS);
865 // Garbage collection
866 virtual void oops_do(OopClosure* cl);
868 void oop_follow_contents(oop obj);
869 int oop_adjust_pointers(oop obj);
871 void clean_implementors_list(BoolObjectClosure* is_alive);
872 void clean_method_data(BoolObjectClosure* is_alive);
874 // Explicit metaspace deallocation of fields
875 // For RedefineClasses, we need to deallocate instanceKlasses
876 void deallocate_contents(ClassLoaderData* loader_data);
878 // The constant pool is on stack if any of the methods are executing or
879 // referenced by handles.
880 bool on_stack() const { return _constants->on_stack(); }
882 void release_C_heap_structures();
884 // Parallel Scavenge and Parallel Old
885 PARALLEL_GC_DECLS
887 // Naming
888 const char* signature_name() const;
890 // Iterators
891 int oop_oop_iterate(oop obj, ExtendedOopClosure* blk) {
892 return oop_oop_iterate_v(obj, blk);
893 }
895 int oop_oop_iterate_m(oop obj, ExtendedOopClosure* blk, MemRegion mr) {
896 return oop_oop_iterate_v_m(obj, blk, mr);
897 }
899 #define InstanceKlass_OOP_OOP_ITERATE_DECL(OopClosureType, nv_suffix) \
900 int oop_oop_iterate##nv_suffix(oop obj, OopClosureType* blk); \
901 int oop_oop_iterate##nv_suffix##_m(oop obj, OopClosureType* blk, \
902 MemRegion mr);
904 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_DECL)
905 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_DECL)
907 #ifndef SERIALGC
908 #define InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL(OopClosureType, nv_suffix) \
909 int oop_oop_iterate_backwards##nv_suffix(oop obj, OopClosureType* blk);
911 ALL_OOP_OOP_ITERATE_CLOSURES_1(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
912 ALL_OOP_OOP_ITERATE_CLOSURES_2(InstanceKlass_OOP_OOP_ITERATE_BACKWARDS_DECL)
913 #endif // !SERIALGC
915 u2 idnum_allocated_count() const { return _idnum_allocated_count; }
916 private:
917 // initialization state
918 #ifdef ASSERT
919 void set_init_state(ClassState state);
920 #else
921 void set_init_state(ClassState state) { _init_state = (u1)state; }
922 #endif
923 void set_rewritten() { _misc_flags |= _misc_rewritten; }
924 void set_init_thread(Thread *thread) { _init_thread = thread; }
926 // The RedefineClasses() API can cause new method idnums to be needed
927 // which will cause the caches to grow. Safety requires different
928 // cache management logic if the caches can grow instead of just
929 // going from NULL to non-NULL.
930 bool idnum_can_increment() const { return has_been_redefined(); }
931 jmethodID* methods_jmethod_ids_acquire() const
932 { return (jmethodID*)OrderAccess::load_ptr_acquire(&_methods_jmethod_ids); }
933 void release_set_methods_jmethod_ids(jmethodID* jmeths)
934 { OrderAccess::release_store_ptr(&_methods_jmethod_ids, jmeths); }
936 int* methods_cached_itable_indices_acquire() const
937 { return (int*)OrderAccess::load_ptr_acquire(&_methods_cached_itable_indices); }
938 void release_set_methods_cached_itable_indices(int* indices)
939 { OrderAccess::release_store_ptr(&_methods_cached_itable_indices, indices); }
941 // Lock during initialization
942 volatile oop init_lock() const;
943 void set_init_lock(oop value) { klass_oop_store(&_init_lock, value); }
944 void fence_and_clear_init_lock(); // after fully_initialized
946 // Offsets for memory management
947 oop* adr_protection_domain() const { return (oop*)&this->_protection_domain;}
948 oop* adr_signers() const { return (oop*)&this->_signers;}
949 oop* adr_init_lock() const { return (oop*)&this->_init_lock;}
951 // Static methods that are used to implement member methods where an exposed this pointer
952 // is needed due to possible GCs
953 static bool link_class_impl (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
954 static bool verify_code (instanceKlassHandle this_oop, bool throw_verifyerror, TRAPS);
955 static void initialize_impl (instanceKlassHandle this_oop, TRAPS);
956 static void eager_initialize_impl (instanceKlassHandle this_oop);
957 static void set_initialization_state_and_notify_impl (instanceKlassHandle this_oop, ClassState state, TRAPS);
958 static void call_class_initializer_impl (instanceKlassHandle this_oop, TRAPS);
959 static Klass* array_klass_impl (instanceKlassHandle this_oop, bool or_null, int n, TRAPS);
960 static void do_local_static_fields_impl (instanceKlassHandle this_oop, void f(fieldDescriptor* fd, TRAPS), TRAPS);
961 /* jni_id_for_impl for jfieldID only */
962 static JNIid* jni_id_for_impl (instanceKlassHandle this_oop, int offset);
964 // Returns the array class for the n'th dimension
965 Klass* array_klass_impl(bool or_null, int n, TRAPS);
967 // Returns the array class with this class as element type
968 Klass* array_klass_impl(bool or_null, TRAPS);
970 public:
971 // CDS support - remove and restore oops from metadata. Oops are not shared.
972 virtual void remove_unshareable_info();
973 virtual void restore_unshareable_info(TRAPS);
975 // jvm support
976 jint compute_modifier_flags(TRAPS) const;
978 public:
979 // JVMTI support
980 jint jvmti_class_status() const;
982 public:
983 // Printing
984 #ifndef PRODUCT
985 void print_on(outputStream* st) const;
986 #endif
987 void print_value_on(outputStream* st) const;
989 void oop_print_value_on(oop obj, outputStream* st);
991 #ifndef PRODUCT
992 void oop_print_on (oop obj, outputStream* st);
994 void print_dependent_nmethods(bool verbose = false);
995 bool is_dependent_nmethod(nmethod* nm);
996 #endif
998 const char* internal_name() const;
1000 // Verification
1001 void verify_on(outputStream* st);
1003 void oop_verify_on(oop obj, outputStream* st);
1004 };
1006 inline Method* InstanceKlass::method_at_vtable(int index) {
1007 #ifndef PRODUCT
1008 assert(index >= 0, "valid vtable index");
1009 if (DebugVtables) {
1010 verify_vtable_index(index);
1011 }
1012 #endif
1013 vtableEntry* ve = (vtableEntry*)start_of_vtable();
1014 return ve[index].method();
1015 }
1017 // for adding methods
1018 // UNSET_IDNUM return means no more ids available
1019 inline u2 InstanceKlass::next_method_idnum() {
1020 if (_idnum_allocated_count == ConstMethod::MAX_IDNUM) {
1021 return ConstMethod::UNSET_IDNUM; // no more ids available
1022 } else {
1023 return _idnum_allocated_count++;
1024 }
1025 }
1028 /* JNIid class for jfieldIDs only */
1029 class JNIid: public CHeapObj<mtClass> {
1030 friend class VMStructs;
1031 private:
1032 Klass* _holder;
1033 JNIid* _next;
1034 int _offset;
1035 #ifdef ASSERT
1036 bool _is_static_field_id;
1037 #endif
1039 public:
1040 // Accessors
1041 Klass* holder() const { return _holder; }
1042 int offset() const { return _offset; }
1043 JNIid* next() { return _next; }
1044 // Constructor
1045 JNIid(Klass* holder, int offset, JNIid* next);
1046 // Identifier lookup
1047 JNIid* find(int offset);
1049 bool find_local_field(fieldDescriptor* fd) {
1050 return InstanceKlass::cast(holder())->find_local_field_from_offset(offset(), true, fd);
1051 }
1053 static void deallocate(JNIid* id);
1054 // Debugging
1055 #ifdef ASSERT
1056 bool is_static_field_id() const { return _is_static_field_id; }
1057 void set_is_static_field_id() { _is_static_field_id = true; }
1058 #endif
1059 void verify(Klass* holder);
1060 };
1063 // If breakpoints are more numerous than just JVMTI breakpoints,
1064 // consider compressing this data structure.
1065 // It is currently a simple linked list defined in method.hpp.
1067 class BreakpointInfo;
1070 // A collection point for interesting information about the previous
1071 // version(s) of an InstanceKlass. This class uses weak references to
1072 // the information so that the information may be collected as needed
1073 // by the system. If the information is shared, then a regular
1074 // reference must be used because a weak reference would be seen as
1075 // collectible. A GrowableArray of PreviousVersionNodes is attached
1076 // to the InstanceKlass as needed. See PreviousVersionWalker below.
1077 class PreviousVersionNode : public CHeapObj<mtClass> {
1078 private:
1079 // A shared ConstantPool is never collected so we'll always have
1080 // a reference to it so we can update items in the cache. We'll
1081 // have a weak reference to a non-shared ConstantPool until all
1082 // of the methods (EMCP or obsolete) have been collected; the
1083 // non-shared ConstantPool becomes collectible at that point.
1084 ConstantPool* _prev_constant_pool; // regular or weak reference
1085 bool _prev_cp_is_weak; // true if not a shared ConstantPool
1087 // If the previous version of the InstanceKlass doesn't have any
1088 // EMCP methods, then _prev_EMCP_methods will be NULL. If all the
1089 // EMCP methods have been collected, then _prev_EMCP_methods can
1090 // have a length of zero.
1091 GrowableArray<Method*>* _prev_EMCP_methods;
1093 public:
1094 PreviousVersionNode(ConstantPool* prev_constant_pool, bool prev_cp_is_weak,
1095 GrowableArray<Method*>* prev_EMCP_methods);
1096 ~PreviousVersionNode();
1097 ConstantPool* prev_constant_pool() const {
1098 return _prev_constant_pool;
1099 }
1100 GrowableArray<Method*>* prev_EMCP_methods() const {
1101 return _prev_EMCP_methods;
1102 }
1103 };
1106 // A Handle-ized version of PreviousVersionNode.
1107 class PreviousVersionInfo : public ResourceObj {
1108 private:
1109 constantPoolHandle _prev_constant_pool_handle;
1110 // If the previous version of the InstanceKlass doesn't have any
1111 // EMCP methods, then _prev_EMCP_methods will be NULL. Since the
1112 // methods cannot be collected while we hold a handle,
1113 // _prev_EMCP_methods should never have a length of zero.
1114 GrowableArray<methodHandle>* _prev_EMCP_method_handles;
1116 public:
1117 PreviousVersionInfo(PreviousVersionNode *pv_node);
1118 ~PreviousVersionInfo();
1119 constantPoolHandle prev_constant_pool_handle() const {
1120 return _prev_constant_pool_handle;
1121 }
1122 GrowableArray<methodHandle>* prev_EMCP_method_handles() const {
1123 return _prev_EMCP_method_handles;
1124 }
1125 };
1128 // Helper object for walking previous versions. This helper cleans up
1129 // the Handles that it allocates when the helper object is destroyed.
1130 // The PreviousVersionInfo object returned by next_previous_version()
1131 // is only valid until a subsequent call to next_previous_version() or
1132 // the helper object is destroyed.
1133 class PreviousVersionWalker : public StackObj {
1134 private:
1135 GrowableArray<PreviousVersionNode *>* _previous_versions;
1136 int _current_index;
1137 // Fields for cleaning up when we are done walking the previous versions:
1138 // A HandleMark for the PreviousVersionInfo handles:
1139 HandleMark _hm;
1141 // It would be nice to have a ResourceMark field in this helper also,
1142 // but the ResourceMark code says to be careful to delete handles held
1143 // in GrowableArrays _before_ deleting the GrowableArray. Since we
1144 // can't guarantee the order in which the fields are destroyed, we
1145 // have to let the creator of the PreviousVersionWalker object do
1146 // the right thing. Also, adding a ResourceMark here causes an
1147 // include loop.
1149 // A pointer to the current info object so we can handle the deletes.
1150 PreviousVersionInfo * _current_p;
1152 public:
1153 PreviousVersionWalker(InstanceKlass *ik);
1154 ~PreviousVersionWalker();
1156 // Return the interesting information for the next previous version
1157 // of the klass. Returns NULL if there are no more previous versions.
1158 PreviousVersionInfo* next_previous_version();
1159 };
1162 //
1163 // nmethodBucket is used to record dependent nmethods for
1164 // deoptimization. nmethod dependencies are actually <klass, method>
1165 // pairs but we really only care about the klass part for purposes of
1166 // finding nmethods which might need to be deoptimized. Instead of
1167 // recording the method, a count of how many times a particular nmethod
1168 // was recorded is kept. This ensures that any recording errors are
1169 // noticed since an nmethod should be removed as many times are it's
1170 // added.
1171 //
1172 class nmethodBucket: public CHeapObj<mtClass> {
1173 friend class VMStructs;
1174 private:
1175 nmethod* _nmethod;
1176 int _count;
1177 nmethodBucket* _next;
1179 public:
1180 nmethodBucket(nmethod* nmethod, nmethodBucket* next) {
1181 _nmethod = nmethod;
1182 _next = next;
1183 _count = 1;
1184 }
1185 int count() { return _count; }
1186 int increment() { _count += 1; return _count; }
1187 int decrement() { _count -= 1; assert(_count >= 0, "don't underflow"); return _count; }
1188 nmethodBucket* next() { return _next; }
1189 void set_next(nmethodBucket* b) { _next = b; }
1190 nmethod* get_nmethod() { return _nmethod; }
1191 };
1193 // An iterator that's used to access the inner classes indices in the
1194 // InstanceKlass::_inner_classes array.
1195 class InnerClassesIterator : public StackObj {
1196 private:
1197 Array<jushort>* _inner_classes;
1198 int _length;
1199 int _idx;
1200 public:
1202 InnerClassesIterator(instanceKlassHandle k) {
1203 _inner_classes = k->inner_classes();
1204 if (k->inner_classes() != NULL) {
1205 _length = _inner_classes->length();
1206 // The inner class array's length should be the multiple of
1207 // inner_class_next_offset if it only contains the InnerClasses
1208 // attribute data, or it should be
1209 // n*inner_class_next_offset+enclosing_method_attribute_size
1210 // if it also contains the EnclosingMethod data.
1211 assert((_length % InstanceKlass::inner_class_next_offset == 0 ||
1212 _length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size),
1213 "just checking");
1214 // Remove the enclosing_method portion if exists.
1215 if (_length % InstanceKlass::inner_class_next_offset == InstanceKlass::enclosing_method_attribute_size) {
1216 _length -= InstanceKlass::enclosing_method_attribute_size;
1217 }
1218 } else {
1219 _length = 0;
1220 }
1221 _idx = 0;
1222 }
1224 int length() const {
1225 return _length;
1226 }
1228 void next() {
1229 _idx += InstanceKlass::inner_class_next_offset;
1230 }
1232 bool done() const {
1233 return (_idx >= _length);
1234 }
1236 u2 inner_class_info_index() const {
1237 return _inner_classes->at(
1238 _idx + InstanceKlass::inner_class_inner_class_info_offset);
1239 }
1241 void set_inner_class_info_index(u2 index) {
1242 _inner_classes->at_put(
1243 _idx + InstanceKlass::inner_class_inner_class_info_offset, index);
1244 }
1246 u2 outer_class_info_index() const {
1247 return _inner_classes->at(
1248 _idx + InstanceKlass::inner_class_outer_class_info_offset);
1249 }
1251 void set_outer_class_info_index(u2 index) {
1252 _inner_classes->at_put(
1253 _idx + InstanceKlass::inner_class_outer_class_info_offset, index);
1254 }
1256 u2 inner_name_index() const {
1257 return _inner_classes->at(
1258 _idx + InstanceKlass::inner_class_inner_name_offset);
1259 }
1261 void set_inner_name_index(u2 index) {
1262 _inner_classes->at_put(
1263 _idx + InstanceKlass::inner_class_inner_name_offset, index);
1264 }
1266 u2 inner_access_flags() const {
1267 return _inner_classes->at(
1268 _idx + InstanceKlass::inner_class_access_flags_offset);
1269 }
1270 };
1272 #endif // SHARE_VM_OOPS_INSTANCEKLASS_HPP